CA2385702C - Method and apparatus for making reclosable plastic bags using a pre-applied slider-operated fastener - Google Patents
Method and apparatus for making reclosable plastic bags using a pre-applied slider-operated fastener Download PDFInfo
- Publication number
- CA2385702C CA2385702C CA002385702A CA2385702A CA2385702C CA 2385702 C CA2385702 C CA 2385702C CA 002385702 A CA002385702 A CA 002385702A CA 2385702 A CA2385702 A CA 2385702A CA 2385702 C CA2385702 C CA 2385702C
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- Prior art keywords
- web
- fastener
- sliders
- continuous length
- attaching
- Prior art date
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- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 title claims abstract description 47
- 239000004033 plastic Substances 0.000 title claims abstract description 40
- 229920003023 plastic Polymers 0.000 title claims abstract description 40
- 239000002985 plastic film Substances 0.000 claims abstract description 33
- 229920006255 plastic film Polymers 0.000 claims abstract description 33
- 238000007789 sealing Methods 0.000 claims description 56
- 238000004519 manufacturing process Methods 0.000 claims description 27
- 238000003780 insertion Methods 0.000 claims description 11
- 230000037431 insertion Effects 0.000 claims description 11
- 230000013011 mating Effects 0.000 claims description 10
- 239000000463 material Substances 0.000 description 9
- 230000007246 mechanism Effects 0.000 description 5
- 230000004888 barrier function Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 235000013305 food Nutrition 0.000 description 2
- 238000012432 intermediate storage Methods 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 241000726103 Atta Species 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000005021 flexible packaging material Substances 0.000 description 1
- 230000009969 flowable effect Effects 0.000 description 1
- 239000012775 heat-sealing material Substances 0.000 description 1
- 235000015243 ice cream Nutrition 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 235000011888 snacks Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B9/00—Enclosing successive articles, or quantities of material, e.g. liquids or semiliquids, in flat, folded, or tubular webs of flexible sheet material; Subdividing filled flexible tubes to form packages
- B65B9/10—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs
- B65B9/20—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs the webs being formed into tubes in situ around the filling nozzles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B61/00—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages
- B65B61/18—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages for making package-opening or unpacking elements
- B65B61/188—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages for making package-opening or unpacking elements by applying or incorporating profile-strips, e.g. for reclosable bags
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B9/00—Enclosing successive articles, or quantities of material, e.g. liquids or semiliquids, in flat, folded, or tubular webs of flexible sheet material; Subdividing filled flexible tubes to form packages
- B65B9/06—Enclosing successive articles, or quantities of material, in a longitudinally-folded web, or in a web folded into a tube about the articles or quantities of material placed upon it
- B65B9/08—Enclosing successive articles, or quantities of material, in a longitudinally-folded web, or in a web folded into a tube about the articles or quantities of material placed upon it in a web folded and sealed transversely to form pockets which are subsequently filled and then closed by sealing
- B65B9/093—Enclosing successive articles, or quantities of material, in a longitudinally-folded web, or in a web folded into a tube about the articles or quantities of material placed upon it in a web folded and sealed transversely to form pockets which are subsequently filled and then closed by sealing the web having intermittent motion
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B9/00—Enclosing successive articles, or quantities of material, e.g. liquids or semiliquids, in flat, folded, or tubular webs of flexible sheet material; Subdividing filled flexible tubes to form packages
- B65B9/10—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs
- B65B9/20—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs the webs being formed into tubes in situ around the filling nozzles
- B65B9/213—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs the webs being formed into tubes in situ around the filling nozzles the web having intermittent motion
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B9/00—Enclosing successive articles, or quantities of material, e.g. liquids or semiliquids, in flat, folded, or tubular webs of flexible sheet material; Subdividing filled flexible tubes to form packages
- B65B9/10—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs
- B65B9/20—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs the webs being formed into tubes in situ around the filling nozzles
- B65B9/207—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs the webs being formed into tubes in situ around the filling nozzles the web advancing continuously
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49782—Method of mechanical manufacture of a slide fastener
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Making Paper Articles (AREA)
- Containers And Plastic Fillers For Packaging (AREA)
- Slide Fasteners (AREA)
- Bag Frames (AREA)
Abstract
A method and apparatus for making reclosable plastic bags is provided. In the method and apparatus, a fastener (10) is attached to a moving flat web of plastic film (50), preferably in the direction of web movement and near the center of the web. A
plurality of sliders (40) are mounted to the fastener either before or after the fastener is attached to the flat web, but prior to conveying the web to a FFS machine. The flat web, with the slider-operated fastener already attached thereto, is then conveyed to a vertical or horizontal FFS machine where the flat web is formed into bags (80), and the bags are successively filled (81) and sealed (84).
plurality of sliders (40) are mounted to the fastener either before or after the fastener is attached to the flat web, but prior to conveying the web to a FFS machine. The flat web, with the slider-operated fastener already attached thereto, is then conveyed to a vertical or horizontal FFS machine where the flat web is formed into bags (80), and the bags are successively filled (81) and sealed (84).
Description
l METHOD AND APPARATUS FOR MAKING RECLOSABLE PLASTIC BAGS
USING A PRE-APPLIED SLIDER-OPERATED FASTENER
FIELD OF THE iNVENTION
The present invention generally relates to methods and apparatus for manufacturing reclosable plastic bags and, more particularly, to a method and apparatus for manufacturing reclosable plastic bags using a pre-applied slider-operated fastener.
BACKGROUND OF THE IlVVENTION
The term form-fill-seal (FFS) means producing a bag or pouch from a flexible packaging material, inserting a measured amount of product, and closing the bag. Two io distinct principles are utilized for FFS packaging: horizontal and vertical. In a typical vertical FFS machine for example, a flat web of plastic film is shaped around a bag-forming tube. As the shaped web moves down around the forming tube, the opposing edges of the web are overlapped for either a fin or lap seal. At this point, with the web wrapped around the tube, the web moving vertically down along the bag-forming tube will be sealed. A vertical seal mechanism forms the fm or lap seal to make the web into a tube, and a cross-seal mechanism forms a cross-seal beneath the bag-forming tube to simultaneously seal the top of a filled bag and the bottom of a succeeding empty bag.
After sealing the bottom of the succeeding empty bag, the succeeding empty bag is filled with a product dropped through the bag-forming tube.
If the bag is to be reclosable, a fastener is typically attached to the inner surface of the web. The fastener may be continuous and move in the same direction as the web, or the fastener may be divided into individual bag-width segments applied transverse to the direction of web movement. To facilitate operation of the reclosable fastener, a slider may be slidably mounted thereto. The slider engages the fastener's interlocking profiles while moved in one direction, and disengages the profiles while moved in the opposite direction.
Heretofore, it has been proposed to attach the slider-operated fastener to the web as the web moves through the FFS machine. For example, in one proposed technique used on vertical FFS machines, the sliders are mounted to the fastener prior to the bag-forming tube and the slider-operated fastener is subsequently attached to the web as the
USING A PRE-APPLIED SLIDER-OPERATED FASTENER
FIELD OF THE iNVENTION
The present invention generally relates to methods and apparatus for manufacturing reclosable plastic bags and, more particularly, to a method and apparatus for manufacturing reclosable plastic bags using a pre-applied slider-operated fastener.
BACKGROUND OF THE IlVVENTION
The term form-fill-seal (FFS) means producing a bag or pouch from a flexible packaging material, inserting a measured amount of product, and closing the bag. Two io distinct principles are utilized for FFS packaging: horizontal and vertical. In a typical vertical FFS machine for example, a flat web of plastic film is shaped around a bag-forming tube. As the shaped web moves down around the forming tube, the opposing edges of the web are overlapped for either a fin or lap seal. At this point, with the web wrapped around the tube, the web moving vertically down along the bag-forming tube will be sealed. A vertical seal mechanism forms the fm or lap seal to make the web into a tube, and a cross-seal mechanism forms a cross-seal beneath the bag-forming tube to simultaneously seal the top of a filled bag and the bottom of a succeeding empty bag.
After sealing the bottom of the succeeding empty bag, the succeeding empty bag is filled with a product dropped through the bag-forming tube.
If the bag is to be reclosable, a fastener is typically attached to the inner surface of the web. The fastener may be continuous and move in the same direction as the web, or the fastener may be divided into individual bag-width segments applied transverse to the direction of web movement. To facilitate operation of the reclosable fastener, a slider may be slidably mounted thereto. The slider engages the fastener's interlocking profiles while moved in one direction, and disengages the profiles while moved in the opposite direction.
Heretofore, it has been proposed to attach the slider-operated fastener to the web as the web moves through the FFS machine. For example, in one proposed technique used on vertical FFS machines, the sliders are mounted to the fastener prior to the bag-forming tube and the slider-operated fastener is subsequently attached to the web as the
2 web moves down the bag-forming tube. In another technique the fastener is attached to the web as the web moves down the bag-forming tube and the sliders are subsequently mounted to the fastener. Such techniques for attaching the slider-operated fastener to the web are closely dependent upon the FFS machine and can adversely affect the machine's efftcienc}i and performance, and require significant modifications to standard FFS
machines in order for such machines to bandle the sliders and fastener.
SUMMARY OF THE INVENTION
To overcome the aforementioned shortcomings, the present invention provides a method and apparatus for making reclosable plastic bags using a pre-applied slider-operated fastener. In the method and apparatus, a fastener is attached to a moving flat web of plastic film, preferably in the direction of web movement and near the center of the web. A plurality of sliders are mounted to the fastener either before or after the fastener is attached to the flat web, but prior to conveying the web to a FFS
machine.
The flat web, with the slider-operated fastener already attached thereto, is then conveyed to a vertical or horizontal FFS machine where the flat web is formed into bags, and the bags are successively filled and sealed.
A significant advantage of attaching the slider-operated fastener to the flat web upstream from the FFS machine is that the operations of mounting the sliders to the fastener and attaching the fastener to the flat web can be performed independently from the FFS machine and therefore do not adversely impact the FFS machine's efficiency and performance. The performance of the FFS machine can be measured by such parameters as the machine's filling rate, cycle speed, scrap/reclaim generation, etc.
Also, by pre-applying the slider-operated fastener to the flat web, a broad range of current FFS
machines can be easily retrofitted to handle the web with minimal customization.
According to an aspect of the present invention there is provided a method of making reclosable plastic bags, comprising mounting a plurality of sliders to a continuous length of fastener, attaching the continuous length of fastener to a moving, unfolded flat web of plastic film, after mounting the sliders to the fastener and attaching the fastener to the moving, unfolded flat web, forming the web into successive bags 2a including the step of folding the web, and successively filling and sealing the successive bags.
According to another aspect of the present invention there is provided a method of making reclosable plastic bags, comprising mounting a plurality of sliders to a continuous length of fastener, attaching the continuous length of fastener to a moving flat web of plastic film, and after mounting the sliders to the fastener and attaching the fastener to the moving flat web, conveying the web to a form-fill-seal machine where the web is formed into successive bags that are successively filled and sealed.
According to a further aspect of the present invention there is provided an apparatus for making reclosable plastic bags, comprising means for mounting a plurality of sliders to a continuous length of fastener, means for attaching the continuous length of fastener to a moving, unfolded flat web of plastic film, means, located downstream from the mounting means and the attaching means, for forming the web into successive bags, the forming means including a folding board for folding the unfolded web, and means for successively filling and sealing the successive bags.
According to a further aspect of the present invention there is provided an apparatus for making reclosable plastic bags, comprising means for mounting a plurality of sliders to a continuous length of fastener, means for attaching the continuous length of fastener to a moving flat web of plastic film, and a form-film-seal machine, located downstream from the mounting and attaching means, for forming the web into successive bags and successively filling and sealing the bags.
According to a further aspect of the present invention there is provided a method of making reclosable plastic bags, comprising mounting a plurality of sliders to a continuous length of fastener having first and second fins, the first and second fins each having a corresponding profile, attaching the first fin of the continuous length of fastener to a moving flat web of plastic film, after mounting the sliders to the fastener and attaching the fastener to the moving flat web, conveying the web to a form-fill-seal machine where the web is formed into successive bags that are successively filled and sealed, attaching the second fin to the web within the form-fill-seal machine.
According to a further aspect of the present invention there is provided a method of making reclosable plastic bags, comprising mounting a plurality of sliders to a continuous length of fastener having first and second fins, the first and second fins each having a corresponding profile, sealing the first fin of the continuous length of fastener to 2b a moving flat web of plastic film, after mounting the sliders to the fastener and attaching the fastener to the moving flat web, conveying the web to a horizontal form-fill-seal machine where the web is formed into successive bags that are successively filled and sealed, sealing the second fin to the web within the horizontal form-fill-seal machine, and filling the successive bags with the horizontal form-fill-seal machine after the sealing of the first and second fins.
According to further aspect of the present invention there is provided a method of making reclosable plastic bags, comprising mounting a plurality of sliders to a continuous length of fastener having first and second fins each having a corresponding profile that are interlocked during the mounting, after the mounting, attaching the first fin of the continuous length of fastener to a moving flat web of plastic film, and after mounting the sliders to the fastener and attaching the fastener to the moving flat web, conveying the web to a form-fill-seal machine where the web is formed into successive bags that are successively filled and sealed.
In another aspect, the invention provides a method of making reclosable plastic bags, the method comprising mounting a plurality of sliders to a continuous length of fastener by inserting the plurality of sliders through notches in the continuous length of fastener, the fastener including mating male and female profiles, each of the notches extending into the male and female profiles and having a length parallel to the lengths of the profiles that allows for insertion of one of the sliders, attaching the continuous length of fastener to a moving, unfolded flat web of plastic film, after mounting the sliders to the fastener and attaching the fastener to the moving, unfolded flat web, forming the web into successive bags including the step of folding the web, and successively filling and sealing the successive bags.
In another, the invention provides a method of making reclosable plastic bags, the method comprising mounting a plurality of sliders to a continuous length of fastener by inserting the plurality of sliders through notches within the continuous length of fastener, the fastener including mating male and female profiles, each of the notches extending into the male and female profiles and having a length parallel to the lengths of the profiles that allows for insertion of one of the sliders, attaching the continuous length of fastener to a moving flat web of plastic film, and after mounting the sliders to the fastener and attaching the fastener to the moving flat web, conveying the web to a form-fill-seal 2c machine where the web is formed into successive bags that are successively filled and sealed.
In another, the invention provides an apparatus for making reclosable plastic bags, the apparatus comprising means for mounting a plurality of sliders to a continuous length of fastener, means for attaching the continuous length of fastener to a moving, unfolded flat web of plastic film, means, located downstream from the mounting means and the attaching means, for forming the web into successive bags, the forming means including a folding board for folding the unfolded web, the forming means including a collar with an interior slot located with an outer periphery of the collar and a bag-forming tube encompassed by the collar, the web being drawn between the collar and the bag-forming tube, the forming means including means for sealing opposing longitudinal edges of the web to each other alongside the bag-forming tube so that the web is wrapped around the bag-forming tube, the forming means further including means for cross-sealing the web below the bag-forming tube, a folding plate extending into the interior slot from the bag-forming tube, the web and the fastener being drawn through the interior slot and around the folding plate to form a C-fold in the web, the fastener being located in the C-fold, and means for successively filling and sealing the successive bags.
In another aspect, the invention provides a method of making reclosable plastic bags, the method comprising mounting a plurality of sliders to a continuous length of fastener having first and second fins, the first and second fins each having a corresponding profile that are interlocked during the mounting, the mounting includes intermittently moving the continuous length of fastener and, while the continuous length of fastener is in a stoppage, locating one of the plurality of sliders in a notch, each of the notches extending into the profile and having a length that allows for the location of one of the sliders therein, the intermittent moving subsequent to the stoppages causing the sliders located in respective ones of the notches to be threaded onto the continuous length of fastener, after the mounting, attaching the first fin of the continuous length of fastener to a moving flat web of plastic film, and after mounting the sliders to the fastener and attaching the fastener to the moving flat web, conveying the web to a form-fill-seal machine where the web is formed into successive bags that are successively filled and sealed.
In another aspect, the invention provides a method of making reclosable plastic bags, the method comprising the acts of mounting a plurality of sliders to a continuous 2d length of fastener by inserting the plurality of sliders through notches in the continuous length of fastener, the fastener including mating male and female profiles, each of the notches extending into the male and female profiles and having a length parallel to the lengths of the profiles that allows for insertion of one of the sliders, attaching the continuous length of fastener to a moving web of plastic film, after mounting the sliders to the fastener and attaching the fastener to the moving web, forming the web into successive bags including folding the web, and successively filling and sealing the successive bags.
In another aspect, the invention provides a method of making reclosable plastic bags, the method comprising the acts of mounting a plurality of sliders to a continuous length of fastener by installing the plurality of sliders at spaced locations along the continuous length of fastener, the fastener including mating male and female profiles, subsequent to the mounting of the sliders, attaching the continuous length of fastener to a moving web of plastic film at an atta.chment location on the web, the attachment location on the web being flat and unfolded, and after attaching the continuous length of fastener to the moving flat web, directly conveying the moving web to a form-fill-seal machine where the web is formed into successive bags that are successively filled and sealed.
In another aspect, the invention provides a method of making reclosable plastic bags, the method comprising the acts of mounting a plurality of sliders to a continuous length of fastener by inserting the plurality of sliders through notches in the continuous length of fastener, the fastener including mating male and female profiles, each of the notches extending into the male and female profiles and having a length parallel to the lengths of the profiles that allows for insertion of one of the sliders, attaching the continuous length of fastener to a moving web of plastic film, and after mounting the sliders to the fastener and attaching the fastener to the moving web, conveying the moving web to a form-fill-seal machine where the web is formed into successive bags that are filled and sealed.
2e BRIEF DESCRIPTION OF THE DRAWINGS
Other objects and advantages of the invention will beconie apparent upon reading the following detailed description and upon reference to the drawings in which:
FIG. 1 depicts a method of making a slider-operated fastener;
FIG. 2 depicts a method and apparatus for attaching the slider-operated fastener to a flat web of plastic filnl-and then conveying the web to a horizontal FFS
machine;
FIG. 3 depicts a method and apparatus for attaching the slider-operated fastener to a flat web of plastic film and then conveying the web to a vertical FFS
machine;
machines in order for such machines to bandle the sliders and fastener.
SUMMARY OF THE INVENTION
To overcome the aforementioned shortcomings, the present invention provides a method and apparatus for making reclosable plastic bags using a pre-applied slider-operated fastener. In the method and apparatus, a fastener is attached to a moving flat web of plastic film, preferably in the direction of web movement and near the center of the web. A plurality of sliders are mounted to the fastener either before or after the fastener is attached to the flat web, but prior to conveying the web to a FFS
machine.
The flat web, with the slider-operated fastener already attached thereto, is then conveyed to a vertical or horizontal FFS machine where the flat web is formed into bags, and the bags are successively filled and sealed.
A significant advantage of attaching the slider-operated fastener to the flat web upstream from the FFS machine is that the operations of mounting the sliders to the fastener and attaching the fastener to the flat web can be performed independently from the FFS machine and therefore do not adversely impact the FFS machine's efficiency and performance. The performance of the FFS machine can be measured by such parameters as the machine's filling rate, cycle speed, scrap/reclaim generation, etc.
Also, by pre-applying the slider-operated fastener to the flat web, a broad range of current FFS
machines can be easily retrofitted to handle the web with minimal customization.
According to an aspect of the present invention there is provided a method of making reclosable plastic bags, comprising mounting a plurality of sliders to a continuous length of fastener, attaching the continuous length of fastener to a moving, unfolded flat web of plastic film, after mounting the sliders to the fastener and attaching the fastener to the moving, unfolded flat web, forming the web into successive bags 2a including the step of folding the web, and successively filling and sealing the successive bags.
According to another aspect of the present invention there is provided a method of making reclosable plastic bags, comprising mounting a plurality of sliders to a continuous length of fastener, attaching the continuous length of fastener to a moving flat web of plastic film, and after mounting the sliders to the fastener and attaching the fastener to the moving flat web, conveying the web to a form-fill-seal machine where the web is formed into successive bags that are successively filled and sealed.
According to a further aspect of the present invention there is provided an apparatus for making reclosable plastic bags, comprising means for mounting a plurality of sliders to a continuous length of fastener, means for attaching the continuous length of fastener to a moving, unfolded flat web of plastic film, means, located downstream from the mounting means and the attaching means, for forming the web into successive bags, the forming means including a folding board for folding the unfolded web, and means for successively filling and sealing the successive bags.
According to a further aspect of the present invention there is provided an apparatus for making reclosable plastic bags, comprising means for mounting a plurality of sliders to a continuous length of fastener, means for attaching the continuous length of fastener to a moving flat web of plastic film, and a form-film-seal machine, located downstream from the mounting and attaching means, for forming the web into successive bags and successively filling and sealing the bags.
According to a further aspect of the present invention there is provided a method of making reclosable plastic bags, comprising mounting a plurality of sliders to a continuous length of fastener having first and second fins, the first and second fins each having a corresponding profile, attaching the first fin of the continuous length of fastener to a moving flat web of plastic film, after mounting the sliders to the fastener and attaching the fastener to the moving flat web, conveying the web to a form-fill-seal machine where the web is formed into successive bags that are successively filled and sealed, attaching the second fin to the web within the form-fill-seal machine.
According to a further aspect of the present invention there is provided a method of making reclosable plastic bags, comprising mounting a plurality of sliders to a continuous length of fastener having first and second fins, the first and second fins each having a corresponding profile, sealing the first fin of the continuous length of fastener to 2b a moving flat web of plastic film, after mounting the sliders to the fastener and attaching the fastener to the moving flat web, conveying the web to a horizontal form-fill-seal machine where the web is formed into successive bags that are successively filled and sealed, sealing the second fin to the web within the horizontal form-fill-seal machine, and filling the successive bags with the horizontal form-fill-seal machine after the sealing of the first and second fins.
According to further aspect of the present invention there is provided a method of making reclosable plastic bags, comprising mounting a plurality of sliders to a continuous length of fastener having first and second fins each having a corresponding profile that are interlocked during the mounting, after the mounting, attaching the first fin of the continuous length of fastener to a moving flat web of plastic film, and after mounting the sliders to the fastener and attaching the fastener to the moving flat web, conveying the web to a form-fill-seal machine where the web is formed into successive bags that are successively filled and sealed.
In another aspect, the invention provides a method of making reclosable plastic bags, the method comprising mounting a plurality of sliders to a continuous length of fastener by inserting the plurality of sliders through notches in the continuous length of fastener, the fastener including mating male and female profiles, each of the notches extending into the male and female profiles and having a length parallel to the lengths of the profiles that allows for insertion of one of the sliders, attaching the continuous length of fastener to a moving, unfolded flat web of plastic film, after mounting the sliders to the fastener and attaching the fastener to the moving, unfolded flat web, forming the web into successive bags including the step of folding the web, and successively filling and sealing the successive bags.
In another, the invention provides a method of making reclosable plastic bags, the method comprising mounting a plurality of sliders to a continuous length of fastener by inserting the plurality of sliders through notches within the continuous length of fastener, the fastener including mating male and female profiles, each of the notches extending into the male and female profiles and having a length parallel to the lengths of the profiles that allows for insertion of one of the sliders, attaching the continuous length of fastener to a moving flat web of plastic film, and after mounting the sliders to the fastener and attaching the fastener to the moving flat web, conveying the web to a form-fill-seal 2c machine where the web is formed into successive bags that are successively filled and sealed.
In another, the invention provides an apparatus for making reclosable plastic bags, the apparatus comprising means for mounting a plurality of sliders to a continuous length of fastener, means for attaching the continuous length of fastener to a moving, unfolded flat web of plastic film, means, located downstream from the mounting means and the attaching means, for forming the web into successive bags, the forming means including a folding board for folding the unfolded web, the forming means including a collar with an interior slot located with an outer periphery of the collar and a bag-forming tube encompassed by the collar, the web being drawn between the collar and the bag-forming tube, the forming means including means for sealing opposing longitudinal edges of the web to each other alongside the bag-forming tube so that the web is wrapped around the bag-forming tube, the forming means further including means for cross-sealing the web below the bag-forming tube, a folding plate extending into the interior slot from the bag-forming tube, the web and the fastener being drawn through the interior slot and around the folding plate to form a C-fold in the web, the fastener being located in the C-fold, and means for successively filling and sealing the successive bags.
In another aspect, the invention provides a method of making reclosable plastic bags, the method comprising mounting a plurality of sliders to a continuous length of fastener having first and second fins, the first and second fins each having a corresponding profile that are interlocked during the mounting, the mounting includes intermittently moving the continuous length of fastener and, while the continuous length of fastener is in a stoppage, locating one of the plurality of sliders in a notch, each of the notches extending into the profile and having a length that allows for the location of one of the sliders therein, the intermittent moving subsequent to the stoppages causing the sliders located in respective ones of the notches to be threaded onto the continuous length of fastener, after the mounting, attaching the first fin of the continuous length of fastener to a moving flat web of plastic film, and after mounting the sliders to the fastener and attaching the fastener to the moving flat web, conveying the web to a form-fill-seal machine where the web is formed into successive bags that are successively filled and sealed.
In another aspect, the invention provides a method of making reclosable plastic bags, the method comprising the acts of mounting a plurality of sliders to a continuous 2d length of fastener by inserting the plurality of sliders through notches in the continuous length of fastener, the fastener including mating male and female profiles, each of the notches extending into the male and female profiles and having a length parallel to the lengths of the profiles that allows for insertion of one of the sliders, attaching the continuous length of fastener to a moving web of plastic film, after mounting the sliders to the fastener and attaching the fastener to the moving web, forming the web into successive bags including folding the web, and successively filling and sealing the successive bags.
In another aspect, the invention provides a method of making reclosable plastic bags, the method comprising the acts of mounting a plurality of sliders to a continuous length of fastener by installing the plurality of sliders at spaced locations along the continuous length of fastener, the fastener including mating male and female profiles, subsequent to the mounting of the sliders, attaching the continuous length of fastener to a moving web of plastic film at an atta.chment location on the web, the attachment location on the web being flat and unfolded, and after attaching the continuous length of fastener to the moving flat web, directly conveying the moving web to a form-fill-seal machine where the web is formed into successive bags that are successively filled and sealed.
In another aspect, the invention provides a method of making reclosable plastic bags, the method comprising the acts of mounting a plurality of sliders to a continuous length of fastener by inserting the plurality of sliders through notches in the continuous length of fastener, the fastener including mating male and female profiles, each of the notches extending into the male and female profiles and having a length parallel to the lengths of the profiles that allows for insertion of one of the sliders, attaching the continuous length of fastener to a moving web of plastic film, and after mounting the sliders to the fastener and attaching the fastener to the moving web, conveying the moving web to a form-fill-seal machine where the web is formed into successive bags that are filled and sealed.
2e BRIEF DESCRIPTION OF THE DRAWINGS
Other objects and advantages of the invention will beconie apparent upon reading the following detailed description and upon reference to the drawings in which:
FIG. 1 depicts a method of making a slider-operated fastener;
FIG. 2 depicts a method and apparatus for attaching the slider-operated fastener to a flat web of plastic filnl-and then conveying the web to a horizontal FFS
machine;
FIG. 3 depicts a method and apparatus for attaching the slider-operated fastener to a flat web of plastic film and then conveying the web to a vertical FFS
machine;
3 FIG. 4 is an enlarged isometric view of the vertical FFS machine;
FIG. 5 is a section taken generally along line 5-5 in FIG. 4;
FIG. 6 is an isometric view of a partially-opened finished bag produced by the methods and apparatus of FIGS. 2 and 3;
s FIG. 7 depicts a method and apparatus for attaching the slider-operated fastener to a flat web of plastic film and then conveying the web to a horizontal FFS
machine in the form of a flow wrapper;
FIG. 8 is a section taken generally along line 8-8 in FIG. 7; and FIG. 9 is a section taken generally along line 9-9 in FIG. 7.
While the invention is susceptible to various modifications and alternative forms, a specific embodiment thereof has been shown by way of example in the drawings and will herein be described in detail. It should be understood, bowever, that it is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives, falling within the spirit and scope of the invention as defined by the appended claims.
DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS
Turning to the drawings, FIG. I depicts a method of making a slider-operated fastener for use in reclosable plastic bags. In the method, there is provided a continuous fastener 10 including first and second opposing tracks 12 and 14. The tracks 12 and 14 include respective first and second interlocking profiles 16 and 18 and respective first and second fins 20 and 22 extending downward from the respective profiles 16 and 18.
The profile 16 preferably includes a rib, and the profile 18 preferably includes a groove for receiving the rib. Further details concerning the construction of the profiles 16 anci 18 can be obtained from U.S. Patent No. 5,007,143 to Herrington. The fastener can be unwound from a spool or the like.
The fastener 10 is conveyed by rollers and the like (not shown) to a preseal station. The preseal station includes a pair of reciprocating seal bars 24 and 26. Either both of the seal bars 24 and 26 move back and forth between open and closed positions, or one of the seal bars is stationary while the other seal bar moves back and forth. At least the seal bar 24 is heated. The other bar 26 can be heated as well, or can simply serve as a backing against which the heated seal bar 24 applies pressure when the seal
FIG. 5 is a section taken generally along line 5-5 in FIG. 4;
FIG. 6 is an isometric view of a partially-opened finished bag produced by the methods and apparatus of FIGS. 2 and 3;
s FIG. 7 depicts a method and apparatus for attaching the slider-operated fastener to a flat web of plastic film and then conveying the web to a horizontal FFS
machine in the form of a flow wrapper;
FIG. 8 is a section taken generally along line 8-8 in FIG. 7; and FIG. 9 is a section taken generally along line 9-9 in FIG. 7.
While the invention is susceptible to various modifications and alternative forms, a specific embodiment thereof has been shown by way of example in the drawings and will herein be described in detail. It should be understood, bowever, that it is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives, falling within the spirit and scope of the invention as defined by the appended claims.
DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS
Turning to the drawings, FIG. I depicts a method of making a slider-operated fastener for use in reclosable plastic bags. In the method, there is provided a continuous fastener 10 including first and second opposing tracks 12 and 14. The tracks 12 and 14 include respective first and second interlocking profiles 16 and 18 and respective first and second fins 20 and 22 extending downward from the respective profiles 16 and 18.
The profile 16 preferably includes a rib, and the profile 18 preferably includes a groove for receiving the rib. Further details concerning the construction of the profiles 16 anci 18 can be obtained from U.S. Patent No. 5,007,143 to Herrington. The fastener can be unwound from a spool or the like.
The fastener 10 is conveyed by rollers and the like (not shown) to a preseal station. The preseal station includes a pair of reciprocating seal bars 24 and 26. Either both of the seal bars 24 and 26 move back and forth between open and closed positions, or one of the seal bars is stationary while the other seal bar moves back and forth. At least the seal bar 24 is heated. The other bar 26 can be heated as well, or can simply serve as a backing against which the heated seal bar 24 applies pressure when the seal
4 bars 24 and 26 are brought together. The temperature, pressure, and dwell time of the seal bars 24 and 26 are properly adjusted to allow the seal bars 24 and 26 to impart a U-shaped presea128. While the fastener 10 is temporarily stopped at the preseal station., the fins 20 and 22 are sealed to each other along the U-shaped preseal 28. The preseal 28 includes a pair of opposing sides 28a, 28b and a bottom 28c bridging the opposing sides.
The opposing sides 28a, 28b are generally located along an upper portion of the fins 20 and 22 and extend downward from the interlocked profiles 16 and 18. The bottom 28c is located along a lower portion of the fms 20 and 22. The seal bar 24 has a U-shaped projection 30 corresponding to the shape of the preseal 28. Although the preseal 28 is io illustrated as being generally U-shaped, the area between the sides 28a, 28b of the preseal 28 can be sealed as well so that the presea128 appears as a solid rectangle.
The preseal 28 preferably does not extend into the profiles 16 and 18 due to the technique for installing sliders on the fastener 101ater in the manufacturing process.
After forming the preseal 28, the fastener 10 is conveyed to a notching station.
is The notching station includes a pair of reciprocating cutters 32 and 34.
Either both of the cutters 32 and 34 move back and forth between open and closed positions, or one of the cutters is stationary while the other cutter moves back and forth. The cutter 32 forms a rectangular projection, while the cutter 34 forms a rectangular hole for receiving the projection. The fastener 10 is temporarily stopped at the notching station with the 20 presea128 aligned between the separated cutters 32 and 34. While the fastener 10 is stopped, the cutters 32 and 34 are brought together such that the rectangular projection of the cutter 32 punches a rectangular section 36 through the rectangular hole of the cutter 34, thereby leaving a U-shaped notch 38 in the fastener 10. Prior to being punched out, the rectangular section 36 is disposed between the opposing sides 28a, 28b of the preseal 25 28 and above the bottom 28c of the preseal 28. Therefore, the preseal 28 generally encompasses the notch 38 and defines a periphery thereof such that the preseal provides a leak-resistant barrier to entry into an interior of the fastener 10 between the fins 20 and 22 via the notch 38. As discussed below, the leak-resistant barrier effectively minimizes leaks in the reclosable plastic bags ultimately formed by the manufacturing process.
30 After forming the notch 38, the fastener 10 is conveyed to a slider insertion station. While the fastener 10 is temporarily stopped at the slider insertion station, a slider 40 from a source of multiple sliders is positioned within the notch 38.
The slider 40 is then threaded onto the fastener 10 in responseto relative movement of the slider 40 and the fastener 10.
Instead of inserting the slider 40 onto the fastener 10 via the notch 38, the slider 40 can be constructed to allow for various other types of installations. For example, the slider can be a multipart plastic slider including a separator finger and two side walls mechanically joined together in place on the fastener. This multipart slider is disclosed in U.S. Patent Nos. 5,007,142 and 5,426,830. The slider can have one or more hinged wings that fold and snap permanently in place to attach it to the fastener.
This foldable slider is disclosed in U.S. Patent Nos. 5,010,627, 5,063,644, 5,070,583, and
The opposing sides 28a, 28b are generally located along an upper portion of the fins 20 and 22 and extend downward from the interlocked profiles 16 and 18. The bottom 28c is located along a lower portion of the fms 20 and 22. The seal bar 24 has a U-shaped projection 30 corresponding to the shape of the preseal 28. Although the preseal 28 is io illustrated as being generally U-shaped, the area between the sides 28a, 28b of the preseal 28 can be sealed as well so that the presea128 appears as a solid rectangle.
The preseal 28 preferably does not extend into the profiles 16 and 18 due to the technique for installing sliders on the fastener 101ater in the manufacturing process.
After forming the preseal 28, the fastener 10 is conveyed to a notching station.
is The notching station includes a pair of reciprocating cutters 32 and 34.
Either both of the cutters 32 and 34 move back and forth between open and closed positions, or one of the cutters is stationary while the other cutter moves back and forth. The cutter 32 forms a rectangular projection, while the cutter 34 forms a rectangular hole for receiving the projection. The fastener 10 is temporarily stopped at the notching station with the 20 presea128 aligned between the separated cutters 32 and 34. While the fastener 10 is stopped, the cutters 32 and 34 are brought together such that the rectangular projection of the cutter 32 punches a rectangular section 36 through the rectangular hole of the cutter 34, thereby leaving a U-shaped notch 38 in the fastener 10. Prior to being punched out, the rectangular section 36 is disposed between the opposing sides 28a, 28b of the preseal 25 28 and above the bottom 28c of the preseal 28. Therefore, the preseal 28 generally encompasses the notch 38 and defines a periphery thereof such that the preseal provides a leak-resistant barrier to entry into an interior of the fastener 10 between the fins 20 and 22 via the notch 38. As discussed below, the leak-resistant barrier effectively minimizes leaks in the reclosable plastic bags ultimately formed by the manufacturing process.
30 After forming the notch 38, the fastener 10 is conveyed to a slider insertion station. While the fastener 10 is temporarily stopped at the slider insertion station, a slider 40 from a source of multiple sliders is positioned within the notch 38.
The slider 40 is then threaded onto the fastener 10 in responseto relative movement of the slider 40 and the fastener 10.
Instead of inserting the slider 40 onto the fastener 10 via the notch 38, the slider 40 can be constructed to allow for various other types of installations. For example, the slider can be a multipart plastic slider including a separator finger and two side walls mechanically joined together in place on the fastener. This multipart slider is disclosed in U.S. Patent Nos. 5,007,142 and 5,426,830. The slider can have one or more hinged wings that fold and snap permanently in place to attach it to the fastener.
This foldable slider is disclosed in U.S. Patent Nos. 5,010,627, 5,063,644, 5,070,583, and
5,448,808.
The slider can have semi-flexible side walls that allow the slider to be pushed downward onto the fastener from above. Similarly, the slider can be flexible and including a post-installation rigidizing structure as disclosed in U.S. Patent No. 5,283,932.
After installing the slider 40 onto the fastener 10, the fastener 10 is conveyed to an end stop applicator. The end stop applicator applies end stops 42 and 44 to the respective fastener ends 46 and 48 on opposite sides of the notch 38. In the plastic bags ultimately formed by the manufacturing process, the end stop 42 will be located at the fastener end 46 of one bag, while the end stop 44 will be located at the fastener end 48 of the adjacent bag. The end stops perform three primary functions: (1) preventing the slider 40 from going past the ends of the fastener, (2) holding the profiles together to resist stresses applied to the profiles during normal use of the plastic bag, and (3) minimizing leakage from inside the plastic bag out through the fastener ends.
In one embodiment, the end stop applicator includes a pair of chilled, reciprocating molds 47 and 49. Either both of the molds 47 and 49 move back and forth between open and closed positions, or one of the molds is stationary while the other mold moves back and forth. While the fastener 10 is temporarily stopped, the molds 47 and 49 close around the fastener ends 46 and 48. A predetermined amount of flowable plastic material is then forced around and between the profiles 16 and 18 at the fastener ends 46 and 48 by a conventional back pressure device (not shown) coupled to the supply tube.
The molds 47 and 49 form channels for receiving the plastic material and guiding it to the fastener ends 46 and 48.
The slider can have semi-flexible side walls that allow the slider to be pushed downward onto the fastener from above. Similarly, the slider can be flexible and including a post-installation rigidizing structure as disclosed in U.S. Patent No. 5,283,932.
After installing the slider 40 onto the fastener 10, the fastener 10 is conveyed to an end stop applicator. The end stop applicator applies end stops 42 and 44 to the respective fastener ends 46 and 48 on opposite sides of the notch 38. In the plastic bags ultimately formed by the manufacturing process, the end stop 42 will be located at the fastener end 46 of one bag, while the end stop 44 will be located at the fastener end 48 of the adjacent bag. The end stops perform three primary functions: (1) preventing the slider 40 from going past the ends of the fastener, (2) holding the profiles together to resist stresses applied to the profiles during normal use of the plastic bag, and (3) minimizing leakage from inside the plastic bag out through the fastener ends.
In one embodiment, the end stop applicator includes a pair of chilled, reciprocating molds 47 and 49. Either both of the molds 47 and 49 move back and forth between open and closed positions, or one of the molds is stationary while the other mold moves back and forth. While the fastener 10 is temporarily stopped, the molds 47 and 49 close around the fastener ends 46 and 48. A predetermined amount of flowable plastic material is then forced around and between the profiles 16 and 18 at the fastener ends 46 and 48 by a conventional back pressure device (not shown) coupled to the supply tube.
The molds 47 and 49 form channels for receiving the plastic material and guiding it to the fastener ends 46 and 48.
6 Ibistead of applying injection-molded end stops, other types of end stops can be applied to the fastener ends 46 and 48, including those disclosed in U.S.
Patent Nos.
5,924,173, 5,833,791, 5,482,375, 5,448,807, 5,442,837, 5,405,478, 5,161,286, 5,131,121, 5,088,971, and 5,067,208. In U. S. No. 5,067,208, for example, each end stop is in the form of a fairly rigid strap/clip that wraps over the top of the fastener. One end of the strap is provided with a rivet-like member that penetrates through the fastener fins and into a cooperating opening at the other end of the strap.
While the fastener 10 is temporarily stopped in the method depicted in FIG. 1, the io various stations simultaneously perform their respective functions on different parts of the continuous fastener 10 spaced approximately at bag-width distances apart.
Therefore, as the preseal station forms a new presea128, (1) the notching station forms a new notch 38 within a previously formed preseal, (2) the slider insertion station installs a slider 40 via a previously formed notch, and (3) the end stop applicator applies new end stops 42 and 44 proximate a previously installed slider. After each of the stations has completed its respective function on the stopped fastener 10, movement of the fastener 10 is resumed. The fastener 10 is moved for approximately a bag-width distance so that the next station can perform its respective function. The preseals 28 are advantageous in that they allow the fastener 10 to be controlled during such downstream operations as notch formation, slider installation, and end stop installation and when the fastener 10 is tensioned by various rollers in the bag making machine. The preseals 28 keep the interlocked profiles 16 and 18 together and prevent them from moving longitudinally relative to each other.
After applying the end stops 42 and 44, the fastener 10 is preferably applied to a moving flat web of plastic film that is then formed into individual plastic bags.
Altematively, the fastener 10 may be conveyed to a storage medium, such as a spool, and placed in an intermediate storage facility, and then applied to the moving web at a later time.
FIG. 2 depicts a method and apparatus for attaching the slider-operated fastener 10 to a flat web 50 of plastic film and then conveying the web 50 to a horizontal FFS
machine. The fm 20 of the fastener 10 is "tacked" or lightly sealed to a moving web 50 of plastic film unwound from a film roll 52. To tack the fastener fm 20 to the moving
Patent Nos.
5,924,173, 5,833,791, 5,482,375, 5,448,807, 5,442,837, 5,405,478, 5,161,286, 5,131,121, 5,088,971, and 5,067,208. In U. S. No. 5,067,208, for example, each end stop is in the form of a fairly rigid strap/clip that wraps over the top of the fastener. One end of the strap is provided with a rivet-like member that penetrates through the fastener fins and into a cooperating opening at the other end of the strap.
While the fastener 10 is temporarily stopped in the method depicted in FIG. 1, the io various stations simultaneously perform their respective functions on different parts of the continuous fastener 10 spaced approximately at bag-width distances apart.
Therefore, as the preseal station forms a new presea128, (1) the notching station forms a new notch 38 within a previously formed preseal, (2) the slider insertion station installs a slider 40 via a previously formed notch, and (3) the end stop applicator applies new end stops 42 and 44 proximate a previously installed slider. After each of the stations has completed its respective function on the stopped fastener 10, movement of the fastener 10 is resumed. The fastener 10 is moved for approximately a bag-width distance so that the next station can perform its respective function. The preseals 28 are advantageous in that they allow the fastener 10 to be controlled during such downstream operations as notch formation, slider installation, and end stop installation and when the fastener 10 is tensioned by various rollers in the bag making machine. The preseals 28 keep the interlocked profiles 16 and 18 together and prevent them from moving longitudinally relative to each other.
After applying the end stops 42 and 44, the fastener 10 is preferably applied to a moving flat web of plastic film that is then formed into individual plastic bags.
Altematively, the fastener 10 may be conveyed to a storage medium, such as a spool, and placed in an intermediate storage facility, and then applied to the moving web at a later time.
FIG. 2 depicts a method and apparatus for attaching the slider-operated fastener 10 to a flat web 50 of plastic film and then conveying the web 50 to a horizontal FFS
machine. The fm 20 of the fastener 10 is "tacked" or lightly sealed to a moving web 50 of plastic film unwound from a film roll 52. To tack the fastener fm 20 to the moving
7 web 50, there is provided a pair of reciprocating seal bars 54 and 56. Either both of the seal bars 54 and 56 move back and forth between open and closed positions, or one of the seal bars is stationary while the other seal bar moves back and forth. Both the fastener 10 and the web 50 are temporarily stopped while the seal bars are brought together to tack the fastener 10 to the web 50. Of course, if the fastener 10 produced by the method in FIG. 1 is conveyed directly to the web 50, as opposed to an intermediate storage facility, the stoppage of the fastener 10 and web 50 for tacking can be made to coincide with the stoppage of the fastener 10 in FIG. 1 for forming the preseal and notch and installing the slider and end stops. In an alternative embodiment, the seal bars 54 and 56 are replaced io with a continuous heat sealing mechanism such as a static hot air blower that blows hot air onto the moving fastener. The tacked fastener 10 is carried with the moving web 50 without shifting relative thereto.
After tacking the fastener 10 to the web 50, the fastener-carrying web 50 is conveyed to the horizontal FFS machine. At a folding station of the FFS
machine, the is web 50 is folded in half with the fastener 10 inside the web 50 and proximate the fold 51.
To fold the web 50, the web 50 is conveyed over a horizontal roller 58, under a triangular folding board 60, and then between a pair of closely spaced vertical rollers 62. The folded web 50 includes a pair of overlapping panels 64 and 66 joined along the fold 51.
After folding the web 50, the fastener fins 20 and 22 are permanently sealed to 20 the respective web panels 66 and 64 by respective seal bars 68 and 70. The seal bars 68 and 70 are sufficiently wide that they generate the fin seals across the entire width of a bag. Either both of the seal bars 68 and 70 move back and forth between open and closed positions, or one of the seal bars is stationary while the other seal bar moves back and forth. The fastener-carrying web 50 is temporarily stopped while the seal bars are 25 brought together to seal the fastener 10 to the web 50. Both of the seal bars 68 and 70 are preferably heated. The temperature, pressure, and dwell time of the seal bars 68 and 70 are properly adjusted to allow the seal bars 68 and 70 to generate the permanent fin seals.
In an alternative embodiment, the seal bars 68 and 70 are replaced with a continuous heat sealing mechanism such as a pair of hot air blowers that blow heated air onto the 3o respective fastener fins.
After sealing the fins 20 and 22 to the respective web panels 66 and 64, the web panels 64 and 66 are sealed to each other along a side seal 72 by a pair of reciprocating
After tacking the fastener 10 to the web 50, the fastener-carrying web 50 is conveyed to the horizontal FFS machine. At a folding station of the FFS
machine, the is web 50 is folded in half with the fastener 10 inside the web 50 and proximate the fold 51.
To fold the web 50, the web 50 is conveyed over a horizontal roller 58, under a triangular folding board 60, and then between a pair of closely spaced vertical rollers 62. The folded web 50 includes a pair of overlapping panels 64 and 66 joined along the fold 51.
After folding the web 50, the fastener fins 20 and 22 are permanently sealed to 20 the respective web panels 66 and 64 by respective seal bars 68 and 70. The seal bars 68 and 70 are sufficiently wide that they generate the fin seals across the entire width of a bag. Either both of the seal bars 68 and 70 move back and forth between open and closed positions, or one of the seal bars is stationary while the other seal bar moves back and forth. The fastener-carrying web 50 is temporarily stopped while the seal bars are 25 brought together to seal the fastener 10 to the web 50. Both of the seal bars 68 and 70 are preferably heated. The temperature, pressure, and dwell time of the seal bars 68 and 70 are properly adjusted to allow the seal bars 68 and 70 to generate the permanent fin seals.
In an alternative embodiment, the seal bars 68 and 70 are replaced with a continuous heat sealing mechanism such as a pair of hot air blowers that blow heated air onto the 3o respective fastener fins.
After sealing the fins 20 and 22 to the respective web panels 66 and 64, the web panels 64 and 66 are sealed to each other along a side seal 72 by a pair of reciprocating
8 seal bars 74 and 76. The side sea172 is transverse to a direction of movement of the folded web 50 and is aligned with a center of the notch 38 (and preseal 28).
Also, the side sea172 extends from the folded bottom 51 to an open top 53 of the folded web 50.
Either both of the seal bars 74 and 76 move back and forth between open and closed positions, or one of the seal bars is stationary while the other seal bar moves back and forth. The folded web 50 is temporarily stopped while the seal bars are brought together to seal the web panels 64 and 66 to each other. At least the seal bar 74 is heated. The other bar 76 can be heated as well, or can simply serve as a backing against which the heated seal bar 74 applies pressure when the seal bars 74 and 76 are brought together.
io The temperature, pressure, and dwell time of the seal bars 74 and 76 are properly adjusted to allow the seal bars 74 and 76 to generate the side seal 72.
After generating the side seal 72, the folded web 50 is conveyed to a cutter 78 for separating the folded web 50 into individual plastic bags. While the folded web 50 is temporarily stopped, the cutter 78 cuts the folded web 50 along a center of the side seal 72 to produce the individual plastic bag 80. The plastic bag 80 is filled with a product through its open top 53 at a filling station 81. Finally, the open top 53 is sealed by a heat sealing mechanism 84. The end result is a filled and sealed bag 80 ready for shipment to a customer such as a grocery store or convenience store.
While the web 50 is temporarily stopped in the method depicted in FIG. 2, the various stations simultaneously perÃorm their respective functions on different parts of the continuous web 50. For example, as the fastener 10 is tacked to the web 50 by the seal bars 54 and 56, (1) the fastener fins 20 and 22 of a previously tacked section of the fastener 10 can be permanently sealed to the respective web panels 64 and 66 by respective seal bars 68 and 70, (2) the web panels 64 and 66 carryirig previously sealed.
fastener fm sections can be sealed to each other along a side seal 72 by the seal bars 74 and 76, and (3) the folded web 50 can be cut along a previously generated side seal.
After each of the stations has completed its respective function on the stopped web 50, movement of the web 50 is resumed.
The fmished bag 80, with its header 82 partially removed by an end user, is illustrated in FIG. 6. After the header 82 is fully removed, each preseal 28 intersects both the adjacent side sea172 and the fastener profiles 16 and 18, thereby providing a leak-resistant barrier between an interior and an exterior of the bag 80. When the profiles 16
Also, the side sea172 extends from the folded bottom 51 to an open top 53 of the folded web 50.
Either both of the seal bars 74 and 76 move back and forth between open and closed positions, or one of the seal bars is stationary while the other seal bar moves back and forth. The folded web 50 is temporarily stopped while the seal bars are brought together to seal the web panels 64 and 66 to each other. At least the seal bar 74 is heated. The other bar 76 can be heated as well, or can simply serve as a backing against which the heated seal bar 74 applies pressure when the seal bars 74 and 76 are brought together.
io The temperature, pressure, and dwell time of the seal bars 74 and 76 are properly adjusted to allow the seal bars 74 and 76 to generate the side seal 72.
After generating the side seal 72, the folded web 50 is conveyed to a cutter 78 for separating the folded web 50 into individual plastic bags. While the folded web 50 is temporarily stopped, the cutter 78 cuts the folded web 50 along a center of the side seal 72 to produce the individual plastic bag 80. The plastic bag 80 is filled with a product through its open top 53 at a filling station 81. Finally, the open top 53 is sealed by a heat sealing mechanism 84. The end result is a filled and sealed bag 80 ready for shipment to a customer such as a grocery store or convenience store.
While the web 50 is temporarily stopped in the method depicted in FIG. 2, the various stations simultaneously perÃorm their respective functions on different parts of the continuous web 50. For example, as the fastener 10 is tacked to the web 50 by the seal bars 54 and 56, (1) the fastener fins 20 and 22 of a previously tacked section of the fastener 10 can be permanently sealed to the respective web panels 64 and 66 by respective seal bars 68 and 70, (2) the web panels 64 and 66 carryirig previously sealed.
fastener fm sections can be sealed to each other along a side seal 72 by the seal bars 74 and 76, and (3) the folded web 50 can be cut along a previously generated side seal.
After each of the stations has completed its respective function on the stopped web 50, movement of the web 50 is resumed.
The fmished bag 80, with its header 82 partially removed by an end user, is illustrated in FIG. 6. After the header 82 is fully removed, each preseal 28 intersects both the adjacent side sea172 and the fastener profiles 16 and 18, thereby providing a leak-resistant barrier between an interior and an exterior of the bag 80. When the profiles 16
9 and 18 are interlocked but the header 82 has been removed, this leak-resistant barrier minimizes food spoilage and leakage of product from inside the bag.
The finished bag 80 can alternatively be produced by the method and apparatus depicted in FIGS. 3-5. FIGS. 3-5 depict a method and apparatus for attaching the slider-operated fastener 10 to the flat web 50 of plastic film and then conveying the web 50 to a vertical FFS machine. Using the seal bars 54 and 56 discussed above, the fin of the fastener 10 is "tacked" or lightly sealed to the moving web 50 of plastic film unwound from a film roll 52. After tacking the fastener 10 to the web 50, the fastener-carrying web 50 is conveyed to the vertical FFS machine, which forms and fills vertically instead io of horizontally.
The vertical FFS machine produces flexible bags from the flat web 50, which has the slider-operated fastener 10 already attached thereto. The web 50 is fed through a series of rollers 90 to a bag-forming collar/tube, where the finished bag 80 is formed.
The roller arrangement (which can include more than the two illustrated rollers 90) 1s maintains minimum tension and controls the web 50 as it passes through the machine, preventing overfeed and whipping action.
The bag-fonning collar or shoulder 92 receives the web 50 from the rollers and changes the web travel from a flat plane and shapes it around a bag-forming tube 94. As the wrapping web 50 moves down around the bag-forming tube 94, the opposing vertical 20 edges of the web 50 are overlapped for either a fm or lap seal 96. A fm seal 96, which is shown in FIGS. 3-5, can be made of materials with sealing properties on only the inner side of the web, because the heat sealable surface seals to itself. A lap seal uses slightly less material, but it requires sealing properties on both sides of the web because the lap is made by sealing the inner ply of one edge to the outer ply of the other edge.
25 At this point, with the web 50 wrapped around the bag-forming tube 94, the actual sealing funetions start. The overlapped vertical edges moving vertically down along the bag-forming tube 94 are sealed. The web 50 advances a predetermined distance that equals the desired bag-width dimension. To advance the web 50, a pair of conventional draw-down drive belts (not shown) can~ be located on opposite sides of the 3o bag-forming tube 94. The drive belts are sufficiently close to the tube 94 to both draw the wrapped web 50 downward and pull additional web material through the collar 92.
The bag width (vertical direction in FIGS. 3 and 4) is the extent of the material hanging down from the bottom of the bag-forming tube 94. The bag height (horizontal direction in FIGS. 3 and 4) is approximately equal to one-half of the outside circumference dimension of the bag-forming tube 94. After the film advance is completed, the bag-sealing and filling completes the remainder of one cycle (film advance/fill/seal).
5 There are three sets of sealing tools on the FFS machine. First, a pair of reciprocating vertical (longitudinal) seal bars 100 are mounted adjacent to the face of the bag-forrning tube 94 and are positioned to seal the fin (or lap) sea196 that makes the web 50 into a tube. The fin seal 96 forms the bottom of the finished bag 80 in FIG. 6.
Second, front and rear cross-sealing (horizontal) jaws 102 combine top- and bottom-io sealing sections with a bag cutoff device in between. The top-sealing portion seals the "bottom" of a succeeding empty bag suspended down from the bag-forming tube 94, and the bottom portion seals the "top" of a filled bag. The "bottom" and "top"
actually correspond to the sides 72 of the finished bag 80 in FIGS. 6. The cutoff device, which can be a knife or a hot wire, operates during the jaw closing/sealing operation. This is means that when the jaws 102 are open, the filled bag is released from the machine. As best shown in FIG. 4, the cross (end) seals are generated in line with the preseals and notches produced by the fastener manufacturing method in FIG. 1.
Third, a pair of reciprocating vertical (longitudinal) seal bars 104 are mounted adjacent to the face of the bag-forming tube 94 diametrically opposite from the seal bars 100 used to generate the fin seal 96. The seal bars 104 are positioned to permanently seal the fastener fins 20 and 22 to opposing sides of a C-fold 112 of the web 50. The seal bars 104 are sufficiently long that they generate the seals across the entire width (vertical direction in FIGS. 3 and 4) of a bag produced by the vertical FFS machine.
As best shown in FIGS. 4 and 5, the bag-forming collar 92 includes a pair of slots 106 and 108 diametrically opposite to each other when the collar 92 is viewed from above (see FIG. 5). The conventional exterior slot 106 intersects the outer periphery of the collar 92 and is used to position the opposing longitudinal edges of the web 50 adjacent to each otller in preparation for the fin seal 96. The interior U-shaped slot 108 cooperates with a folding plate 110 attached to an outer surface of the bag-forming tube 94 to create the C-fold 112 in the web 50. The interior slot 108 opens toward the bag-forming tube 94 and accommodates the folding plate 110. There is a small gap between the collar 92 and the folding plate 110 at the location of the interior slot 108. The folding plate 110 starts above the collar 92 and extends vertically downward below the collar 92 to a height just above the seal bars 104. The C-fold 112 is diametrically opposite the fin sea196. Also, the fastener 10 is positioned slightly off the centerline between the longitudinal edges of the flat web 50 so that when the fastener 10 is drawn through the s interior slot 108 of the collar 92, the fastener 10 is located to one side of the C-fold 112.
The seal bars 104 permanently seal the fastener fins to the opposing sides of the C-fold 112. The folding plate 110 is located entirely above the seal bars 104 so that the folding plate 110 does not interfere with this sealing operation.
The finished bag 80 produced by the vertical FFS machine is generally depicted io in FIG. 6. The width and height dimensions of the bag can vary from the illustrated dimensions, depending on whether the bag is produced by the horizontal FFS
machine in FIG. 2 or the vertical FFS machine in FIGS. 3-5.
FIG. 7 depicts a method and apparatus for attaching the slider-operated fastener to the flat web 50 of plastic film and then conveying the web 50 to a horizontal FFS
machine in the form of a flow wrapper. The flow wrapper forms a bag or pouch by wrapping the web 50 around a product, forming a tube with a fin seal, and sealing the ends. The flow wrapper can be used for a variety of products including, for example, snack foods, ice cream bars, bakery items, novelties, medical supplies, hardware, and other small lightweight items. The web can be made of polyethylene, polypropylene, treated paper, laminates, and other wrapping materials that can = be heat sealed. Materials that do not heat seal naturally can be given heat seal characteristics by treating or laminating them with heat sealing materials. The pouches can be made with or without gussets at the ends.
Referring to FIG. 7, the fin of the fastener 10 is "tacked" or lightly sealed to a central portion of the moving web 50 of plastic film unwound from a film roll 52.
AlteYnatively, the fastener 10 can be attached near an edge of the moving web 50. After tacking the fastener 10 to the web 50, the fastener-carrying web 50 is conveyed to the flow wrapper. The web 50 is fed from the roll 52 into a former 114. A smooth uniform flow of the web 50 is provided by the force that is produced by passing the edges of the web through a pair of adjacent fin seal wheels 116. The web 50 flows into the former 114 over its plough-shaped wings that shape it into a tube around a product 115 as it is being delivered by a conveyor 118.
The former 114 includes an upper slot 124 (see FIG. 8) and a loop-forming bar 126 extending upward through the slot 124. The slot 124 extends inwardly from a downstream end of the forrner 114 and cooperates with the bar 126 to create a C-fold 128 in the web 50. The fastener 10 is positioned slightly off the centerline of the web 50 so s that when the web 50 is forced through the slot 124 by the bar 126, the fastener 10 is located to one side of the C-fold 128. A pair of fastener seal wheels 130 (see FIG. 9) permanently seal the fastener fins to the opposing sides of the C-fold 128.
This seal is made as the C-fold 128 and fastener 10 are pulled through the seal wheels 130.
The two seal wheels 130 have interlocking sets of grooves that make corrugations in the seal as io the C-fold 128 and fastener 10 are pulled between the wheels. The wheels 130 are heated to bring the web 50 up to the sealing temperature as the corrugation is made.
If the web 50 requires a higher sealing temperature, a set of smooth wheels can also be used to preheat the C-fold 128 and fastener 10 before they enter the seal wheels 130.
The amount of pressure exerted by the seal wheels 130 on the web 50 is important for good is sealing. The pressure is regulated by adjusting the clearance between the two wheels.
The fonner 114 also shapes the longitudinal edges of the web 50 into two flaps, or fins, which are sealed together downstream from the fastener seal wheels 130. The i:in seal 120 is generally opposite the C-fold 128 containing the fastener 10 and is made as the fin flaps of the tube are pulled through a pair of fm seal wheels 116. The two fin seal 20 wheels 116 have interlocking sets of grooves that make corrugations in the seal as the fms are pulled between the wheels. The wheels 116 are heated to bring the web 50 up to the sealing temperature as the corrugation is made. If the web 50 requires a higher sealing temperature, a set of smooth fm wheels can also be used to preheat the fins before they enter the fin seal wheels 116. The amount of pressure exerted by the fin seal 25 wheels 116 on the web 50 is important for good sealing. The pressure is regulated by adjusting the clearance between the two wheels. The tightness or looseness of the wrap around the product 115 can be adjusted by tilting the fin seal wheels 116.
Tilting the fin seal wheels 116 toward the discharge end of the machine will draw more film between the wheels and product a wider fin seal and a tighter wrap. Tilting the fin seal wheels 30 116 toward the in-feed end will pull less material between the wheels and loosen the wrap.
After generating the fm seal 120, the ends of the pouch are sealed by a pair of cross-sealing jaws 122. The cross-sealing jaws 122 combine a pair of end-sealing sections with a cutoff device in between. One of the end-sealing sections seals the trailing end of one pouch, while the other end-sealing section seals the leading end of a s succeeding pouch. The cutoff device, which can be a knife or a hot wire, operates during the jaw closing/sealing operation. This means that when the jaws are open, the filled pouch can be discharged from the flow wrapper. The cross (end) seals are generated in line with the preseals and notches produced by the fastener manufacturing method in FIG. 1.
io While the present invention has been described with reference to one or more particular embodiments, those skilled in the art will recognize that many changes may be made thereto without departing from the spirit and scope of the present invention. For example, the fastener 10 can be attached to the flat web 50 prior to forming the preseal 28 and notcb 38, installing the slider 40, and applying the end stops 42 and 44. To allow is the fastener 10 to be accessed for such operations, however, the operations are preferably performed prior to conveying the web 50 to a horizontal or vertical FFS
machine. Also, the equipment used in the fastener and bag manufacturing processes can be modified so that the processes are eritirely continuous with no temporary stoppages in the movement of the fastener or bag making web. Thus, any and all of the unit operations can be 20 performed (1) during a continuous web motion such as a rotary or continuous draw machine or (2) during the web index of an intermittent motion machine. Each of these embodiments and obvious variations thereof is contemplated as falling within the spirit and scope of the claimed invention, which is set forth in the following claims.
The finished bag 80 can alternatively be produced by the method and apparatus depicted in FIGS. 3-5. FIGS. 3-5 depict a method and apparatus for attaching the slider-operated fastener 10 to the flat web 50 of plastic film and then conveying the web 50 to a vertical FFS machine. Using the seal bars 54 and 56 discussed above, the fin of the fastener 10 is "tacked" or lightly sealed to the moving web 50 of plastic film unwound from a film roll 52. After tacking the fastener 10 to the web 50, the fastener-carrying web 50 is conveyed to the vertical FFS machine, which forms and fills vertically instead io of horizontally.
The vertical FFS machine produces flexible bags from the flat web 50, which has the slider-operated fastener 10 already attached thereto. The web 50 is fed through a series of rollers 90 to a bag-forming collar/tube, where the finished bag 80 is formed.
The roller arrangement (which can include more than the two illustrated rollers 90) 1s maintains minimum tension and controls the web 50 as it passes through the machine, preventing overfeed and whipping action.
The bag-fonning collar or shoulder 92 receives the web 50 from the rollers and changes the web travel from a flat plane and shapes it around a bag-forming tube 94. As the wrapping web 50 moves down around the bag-forming tube 94, the opposing vertical 20 edges of the web 50 are overlapped for either a fm or lap seal 96. A fm seal 96, which is shown in FIGS. 3-5, can be made of materials with sealing properties on only the inner side of the web, because the heat sealable surface seals to itself. A lap seal uses slightly less material, but it requires sealing properties on both sides of the web because the lap is made by sealing the inner ply of one edge to the outer ply of the other edge.
25 At this point, with the web 50 wrapped around the bag-forming tube 94, the actual sealing funetions start. The overlapped vertical edges moving vertically down along the bag-forming tube 94 are sealed. The web 50 advances a predetermined distance that equals the desired bag-width dimension. To advance the web 50, a pair of conventional draw-down drive belts (not shown) can~ be located on opposite sides of the 3o bag-forming tube 94. The drive belts are sufficiently close to the tube 94 to both draw the wrapped web 50 downward and pull additional web material through the collar 92.
The bag width (vertical direction in FIGS. 3 and 4) is the extent of the material hanging down from the bottom of the bag-forming tube 94. The bag height (horizontal direction in FIGS. 3 and 4) is approximately equal to one-half of the outside circumference dimension of the bag-forming tube 94. After the film advance is completed, the bag-sealing and filling completes the remainder of one cycle (film advance/fill/seal).
5 There are three sets of sealing tools on the FFS machine. First, a pair of reciprocating vertical (longitudinal) seal bars 100 are mounted adjacent to the face of the bag-forrning tube 94 and are positioned to seal the fin (or lap) sea196 that makes the web 50 into a tube. The fin seal 96 forms the bottom of the finished bag 80 in FIG. 6.
Second, front and rear cross-sealing (horizontal) jaws 102 combine top- and bottom-io sealing sections with a bag cutoff device in between. The top-sealing portion seals the "bottom" of a succeeding empty bag suspended down from the bag-forming tube 94, and the bottom portion seals the "top" of a filled bag. The "bottom" and "top"
actually correspond to the sides 72 of the finished bag 80 in FIGS. 6. The cutoff device, which can be a knife or a hot wire, operates during the jaw closing/sealing operation. This is means that when the jaws 102 are open, the filled bag is released from the machine. As best shown in FIG. 4, the cross (end) seals are generated in line with the preseals and notches produced by the fastener manufacturing method in FIG. 1.
Third, a pair of reciprocating vertical (longitudinal) seal bars 104 are mounted adjacent to the face of the bag-forming tube 94 diametrically opposite from the seal bars 100 used to generate the fin seal 96. The seal bars 104 are positioned to permanently seal the fastener fins 20 and 22 to opposing sides of a C-fold 112 of the web 50. The seal bars 104 are sufficiently long that they generate the seals across the entire width (vertical direction in FIGS. 3 and 4) of a bag produced by the vertical FFS machine.
As best shown in FIGS. 4 and 5, the bag-forming collar 92 includes a pair of slots 106 and 108 diametrically opposite to each other when the collar 92 is viewed from above (see FIG. 5). The conventional exterior slot 106 intersects the outer periphery of the collar 92 and is used to position the opposing longitudinal edges of the web 50 adjacent to each otller in preparation for the fin seal 96. The interior U-shaped slot 108 cooperates with a folding plate 110 attached to an outer surface of the bag-forming tube 94 to create the C-fold 112 in the web 50. The interior slot 108 opens toward the bag-forming tube 94 and accommodates the folding plate 110. There is a small gap between the collar 92 and the folding plate 110 at the location of the interior slot 108. The folding plate 110 starts above the collar 92 and extends vertically downward below the collar 92 to a height just above the seal bars 104. The C-fold 112 is diametrically opposite the fin sea196. Also, the fastener 10 is positioned slightly off the centerline between the longitudinal edges of the flat web 50 so that when the fastener 10 is drawn through the s interior slot 108 of the collar 92, the fastener 10 is located to one side of the C-fold 112.
The seal bars 104 permanently seal the fastener fins to the opposing sides of the C-fold 112. The folding plate 110 is located entirely above the seal bars 104 so that the folding plate 110 does not interfere with this sealing operation.
The finished bag 80 produced by the vertical FFS machine is generally depicted io in FIG. 6. The width and height dimensions of the bag can vary from the illustrated dimensions, depending on whether the bag is produced by the horizontal FFS
machine in FIG. 2 or the vertical FFS machine in FIGS. 3-5.
FIG. 7 depicts a method and apparatus for attaching the slider-operated fastener to the flat web 50 of plastic film and then conveying the web 50 to a horizontal FFS
machine in the form of a flow wrapper. The flow wrapper forms a bag or pouch by wrapping the web 50 around a product, forming a tube with a fin seal, and sealing the ends. The flow wrapper can be used for a variety of products including, for example, snack foods, ice cream bars, bakery items, novelties, medical supplies, hardware, and other small lightweight items. The web can be made of polyethylene, polypropylene, treated paper, laminates, and other wrapping materials that can = be heat sealed. Materials that do not heat seal naturally can be given heat seal characteristics by treating or laminating them with heat sealing materials. The pouches can be made with or without gussets at the ends.
Referring to FIG. 7, the fin of the fastener 10 is "tacked" or lightly sealed to a central portion of the moving web 50 of plastic film unwound from a film roll 52.
AlteYnatively, the fastener 10 can be attached near an edge of the moving web 50. After tacking the fastener 10 to the web 50, the fastener-carrying web 50 is conveyed to the flow wrapper. The web 50 is fed from the roll 52 into a former 114. A smooth uniform flow of the web 50 is provided by the force that is produced by passing the edges of the web through a pair of adjacent fin seal wheels 116. The web 50 flows into the former 114 over its plough-shaped wings that shape it into a tube around a product 115 as it is being delivered by a conveyor 118.
The former 114 includes an upper slot 124 (see FIG. 8) and a loop-forming bar 126 extending upward through the slot 124. The slot 124 extends inwardly from a downstream end of the forrner 114 and cooperates with the bar 126 to create a C-fold 128 in the web 50. The fastener 10 is positioned slightly off the centerline of the web 50 so s that when the web 50 is forced through the slot 124 by the bar 126, the fastener 10 is located to one side of the C-fold 128. A pair of fastener seal wheels 130 (see FIG. 9) permanently seal the fastener fins to the opposing sides of the C-fold 128.
This seal is made as the C-fold 128 and fastener 10 are pulled through the seal wheels 130.
The two seal wheels 130 have interlocking sets of grooves that make corrugations in the seal as io the C-fold 128 and fastener 10 are pulled between the wheels. The wheels 130 are heated to bring the web 50 up to the sealing temperature as the corrugation is made.
If the web 50 requires a higher sealing temperature, a set of smooth wheels can also be used to preheat the C-fold 128 and fastener 10 before they enter the seal wheels 130.
The amount of pressure exerted by the seal wheels 130 on the web 50 is important for good is sealing. The pressure is regulated by adjusting the clearance between the two wheels.
The fonner 114 also shapes the longitudinal edges of the web 50 into two flaps, or fins, which are sealed together downstream from the fastener seal wheels 130. The i:in seal 120 is generally opposite the C-fold 128 containing the fastener 10 and is made as the fin flaps of the tube are pulled through a pair of fm seal wheels 116. The two fin seal 20 wheels 116 have interlocking sets of grooves that make corrugations in the seal as the fms are pulled between the wheels. The wheels 116 are heated to bring the web 50 up to the sealing temperature as the corrugation is made. If the web 50 requires a higher sealing temperature, a set of smooth fm wheels can also be used to preheat the fins before they enter the fin seal wheels 116. The amount of pressure exerted by the fin seal 25 wheels 116 on the web 50 is important for good sealing. The pressure is regulated by adjusting the clearance between the two wheels. The tightness or looseness of the wrap around the product 115 can be adjusted by tilting the fin seal wheels 116.
Tilting the fin seal wheels 116 toward the discharge end of the machine will draw more film between the wheels and product a wider fin seal and a tighter wrap. Tilting the fin seal wheels 30 116 toward the in-feed end will pull less material between the wheels and loosen the wrap.
After generating the fm seal 120, the ends of the pouch are sealed by a pair of cross-sealing jaws 122. The cross-sealing jaws 122 combine a pair of end-sealing sections with a cutoff device in between. One of the end-sealing sections seals the trailing end of one pouch, while the other end-sealing section seals the leading end of a s succeeding pouch. The cutoff device, which can be a knife or a hot wire, operates during the jaw closing/sealing operation. This means that when the jaws are open, the filled pouch can be discharged from the flow wrapper. The cross (end) seals are generated in line with the preseals and notches produced by the fastener manufacturing method in FIG. 1.
io While the present invention has been described with reference to one or more particular embodiments, those skilled in the art will recognize that many changes may be made thereto without departing from the spirit and scope of the present invention. For example, the fastener 10 can be attached to the flat web 50 prior to forming the preseal 28 and notcb 38, installing the slider 40, and applying the end stops 42 and 44. To allow is the fastener 10 to be accessed for such operations, however, the operations are preferably performed prior to conveying the web 50 to a horizontal or vertical FFS
machine. Also, the equipment used in the fastener and bag manufacturing processes can be modified so that the processes are eritirely continuous with no temporary stoppages in the movement of the fastener or bag making web. Thus, any and all of the unit operations can be 20 performed (1) during a continuous web motion such as a rotary or continuous draw machine or (2) during the web index of an intermittent motion machine. Each of these embodiments and obvious variations thereof is contemplated as falling within the spirit and scope of the claimed invention, which is set forth in the following claims.
Claims (23)
1. A method of making reclosable plastic bags, the method comprising:
mounting a plurality of sliders to a continuous length of fastener by inserting said plurality of sliders through notches in said continuous length of fastener, said fastener including mating male and female profiles, each of said notches extending into said male and female profiles and having a length parallel to the lengths of the profiles that allows for insertion of one of said sliders;
attaching the continuous length of fastener to a moving, unfolded flat web of plastic film;
after mounting the sliders to the fastener and attaching the fastener to the moving, unfolded flat web, forming the web into successive bags including the step of folding the web; and successively filling and sealing the successive bags.
mounting a plurality of sliders to a continuous length of fastener by inserting said plurality of sliders through notches in said continuous length of fastener, said fastener including mating male and female profiles, each of said notches extending into said male and female profiles and having a length parallel to the lengths of the profiles that allows for insertion of one of said sliders;
attaching the continuous length of fastener to a moving, unfolded flat web of plastic film;
after mounting the sliders to the fastener and attaching the fastener to the moving, unfolded flat web, forming the web into successive bags including the step of folding the web; and successively filling and sealing the successive bags.
2. The method of claim 1, wherein the sliders are mounted to the fastener prior to attaching the fastener to the moving flat web.
3. The method of claim 1 or 2, wherein the steps of forming the web into the successive bags and successively filling and sealing the successive bags are performed on a horizontal form-fill-seal machine.
4. The method of claim 1 or 2, wherein the steps of forming the web into the successive bags and successively filling and sealing the successive bags are performed on a vertical form-fill-seal machine.
5. The method of any one of claims 1 to 4, wherein the fastener is attached to the moving flat web near its center and in a direction of web movement.
6. The method of claim 5, wherein the step of forming the web into the successive bags includes:
folding the web generally in half to provide a pair of opposing panels joined along a longitudinal fold, the fastener being located near the longitudinal fold; and sealing the opposing panels to each other at spaced side seals transverse to the direction of web movement.
folding the web generally in half to provide a pair of opposing panels joined along a longitudinal fold, the fastener being located near the longitudinal fold; and sealing the opposing panels to each other at spaced side seals transverse to the direction of web movement.
7. The method of claim 5, wherein the step of forming the web into the successive bags includes:
drawing the web between a collar and a bag-forming tube encompassed by the collar;
sealing opposing longitudinal edges of the web to each other alongside the bag-forming tube so that the web is wrapped around the bag-forming tube; and cross-sealing the web below the bag-forming tube.
drawing the web between a collar and a bag-forming tube encompassed by the collar;
sealing opposing longitudinal edges of the web to each other alongside the bag-forming tube so that the web is wrapped around the bag-forming tube; and cross-sealing the web below the bag-forming tube.
8. The method of claim 7, wherein the collar includes an outer periphery and an interior slot located within said outer periphery, and wherein the step of drawing the web between the collar and the bag-forming tube includes drawing the web and the fastener through the slot and around a folding plate extending into the slot from the bag-forming tube to form a C-fold in the web, the fastener being located in the C-fold.
9. The method of claim 8, wherein the step of forming the web into the successive bags includes sealing the fastener to opposing sides of the C-fold.
10. The method of any one of claims 1 to 4, wherein the fastener is attached to the moving flat web near its edge and in the direction of web movement.
11. A method of making reclosable plastic bags, the method comprising:
mounting a plurality of sliders to a continuous length of fastener by inserting said plurality of sliders through notches within said continuous length of fastener, said fastener including mating male and female profiles, each of said notches extending into said male and female profiles and having a length parallel to the lengths of the profiles that allows for insertion of one of said sliders;
attaching the continuous length of fastener to a moving flat web of plastic film; and after mounting the sliders to the fastener and attaching the fastener to the moving flat web, conveying the web to a form-fill-seal machine where the web is formed into successive bags that are successively filled and sealed.
mounting a plurality of sliders to a continuous length of fastener by inserting said plurality of sliders through notches within said continuous length of fastener, said fastener including mating male and female profiles, each of said notches extending into said male and female profiles and having a length parallel to the lengths of the profiles that allows for insertion of one of said sliders;
attaching the continuous length of fastener to a moving flat web of plastic film; and after mounting the sliders to the fastener and attaching the fastener to the moving flat web, conveying the web to a form-fill-seal machine where the web is formed into successive bags that are successively filled and sealed.
12. The method of claim 11, wherein the sliders are mounted to the fastener prior to attaching the fastener to the moving flat web.
13. An apparatus for making reclosable plastic bags, the apparatus comprising:
means for mounting a plurality of sliders to a continuous length of fastener;
means for attaching the continuous length of fastener to a moving, unfolded flat web of plastic film;
means, located downstream from the mounting means and the attaching means, for forming the web into successive bags, said forming means including a folding board for folding said unfolded web, said forming means including a collar with an interior slot located with an outer periphery of the collar and a bag-forming tube encompassed by the collar, the web being drawn between the collar and the bag-forming tube, said forming means including means for sealing opposing longitudinal edges of the web to each other alongside the bag-forming tube so that the web is wrapped around the bag-forming tube, said forming means further including means for cross-sealing the web below the bag-forming tube;
a folding plate extending into the interior slot from the bag-forming tube, the web and the fastener being drawn through the interior slot and around the folding plate to form a C-fold in the web, the fastener being located in the C-fold; and means for successively filling and sealing the successive bags.
means for mounting a plurality of sliders to a continuous length of fastener;
means for attaching the continuous length of fastener to a moving, unfolded flat web of plastic film;
means, located downstream from the mounting means and the attaching means, for forming the web into successive bags, said forming means including a folding board for folding said unfolded web, said forming means including a collar with an interior slot located with an outer periphery of the collar and a bag-forming tube encompassed by the collar, the web being drawn between the collar and the bag-forming tube, said forming means including means for sealing opposing longitudinal edges of the web to each other alongside the bag-forming tube so that the web is wrapped around the bag-forming tube, said forming means further including means for cross-sealing the web below the bag-forming tube;
a folding plate extending into the interior slot from the bag-forming tube, the web and the fastener being drawn through the interior slot and around the folding plate to form a C-fold in the web, the fastener being located in the C-fold; and means for successively filling and sealing the successive bags.
14. The apparatus of claim 13, wherein the forming means and the filling and sealing means include a horizontal form-fill-seal machine.
15. The apparatus of claim 13, wherein the forming means and the filling and sealing means include a vertical form-fill-seal machine.
16. The apparatus of any one of claims 13 to 15, wherein the attaching means attaches the fastener to the moving flat web near its center and in a direction of movement.
17. The apparatus of claim 16, wherein the forming means includes:
means for folding the web generally in half to provide a pair of opposing panels joined along a longitudinal fold, the fastener being located near the longitudinal fold; and means for sealing the opposing panels to each other at spaced side seals transverse to the direction of web movement.
means for folding the web generally in half to provide a pair of opposing panels joined along a longitudinal fold, the fastener being located near the longitudinal fold; and means for sealing the opposing panels to each other at spaced side seals transverse to the direction of web movement.
18. The apparatus of any one of claims 13 to 17, wherein the forming means includes means for sealing the fastener to opposing sides of the C-fold.
19. The apparatus of any one of claims 13 to 15, wherein the attaching means attaches the fastener to the moving flat web near its edge and in a direction of web movement, and wherein the forming means includes:
means for folding the web generally in half to provide a pair of opposing panels joined along a longitudinal fold; and means for sealing the opposing panels to each other at spaced side seals transverse to the direction of web movement.
means for folding the web generally in half to provide a pair of opposing panels joined along a longitudinal fold; and means for sealing the opposing panels to each other at spaced side seals transverse to the direction of web movement.
20. A method of making reclosable plastic bags, the method comprising:
mounting a plurality of sliders to a continuous length of fastener having first and second fins, said first and second fins each having a corresponding profile that are interlocked during said mounting, said mounting includes intermittently moving said continuous length of fastener and, while said continuous length of fastener is in a stoppage, locating one of said plurality of sliders in a notch, each of said notches extending into said profile and having a length that allows for the location of one of said sliders therein, said intermittent moving subsequent to said stoppages causing said sliders located in respective ones of said notches to be threaded onto said continuous length of fastener;
after said mounting, attaching said first fin of said continuous length of fastener to a moving flat web of plastic film; and after mounting said sliders to the fastener and attaching said fastener to said moving flat web, conveying said web to a form-fill-seal machine where said web is formed into successive bags that are successively filled and sealed.
mounting a plurality of sliders to a continuous length of fastener having first and second fins, said first and second fins each having a corresponding profile that are interlocked during said mounting, said mounting includes intermittently moving said continuous length of fastener and, while said continuous length of fastener is in a stoppage, locating one of said plurality of sliders in a notch, each of said notches extending into said profile and having a length that allows for the location of one of said sliders therein, said intermittent moving subsequent to said stoppages causing said sliders located in respective ones of said notches to be threaded onto said continuous length of fastener;
after said mounting, attaching said first fin of said continuous length of fastener to a moving flat web of plastic film; and after mounting said sliders to the fastener and attaching said fastener to said moving flat web, conveying said web to a form-fill-seal machine where said web is formed into successive bags that are successively filled and sealed.
21. A method of making reclosable plastic bags, the method comprising the acts of:
mounting a plurality of sliders to a continuous length of fastener by inserting the plurality of sliders through notches in the continuous length of fastener, the fastener including mating male and female profiles, each of the notches extending into the male and female profiles and having a length parallel to the lengths of the profiles that allows for insertion of one of the sliders;
attaching the continuous length of fastener to a moving web of plastic film;
after mounting the sliders to the fastener and attaching the fastener to the moving web, forming the web into successive bags including folding the web; and successively filling and sealing the successive bags.
mounting a plurality of sliders to a continuous length of fastener by inserting the plurality of sliders through notches in the continuous length of fastener, the fastener including mating male and female profiles, each of the notches extending into the male and female profiles and having a length parallel to the lengths of the profiles that allows for insertion of one of the sliders;
attaching the continuous length of fastener to a moving web of plastic film;
after mounting the sliders to the fastener and attaching the fastener to the moving web, forming the web into successive bags including folding the web; and successively filling and sealing the successive bags.
22. A method of making reclosable plastic bags, the method comprising the acts of:
mounting a plurality of sliders to a continuous length of fastener by installing the plurality of sliders at spaced locations along the continuous length of fastener, the fastener including mating male and female profiles;
subsequent to the mounting of the sliders, attaching the continuous length of fastener to a moving web of plastic film at an attachment location on the web, the attachment location on the web being flat and unfolded; and after attaching the continuous length of fastener to the moving flat web, directly conveying the moving web to a form-fill-seal machine where the web is formed into successive bags that are successively filled and sealed.
mounting a plurality of sliders to a continuous length of fastener by installing the plurality of sliders at spaced locations along the continuous length of fastener, the fastener including mating male and female profiles;
subsequent to the mounting of the sliders, attaching the continuous length of fastener to a moving web of plastic film at an attachment location on the web, the attachment location on the web being flat and unfolded; and after attaching the continuous length of fastener to the moving flat web, directly conveying the moving web to a form-fill-seal machine where the web is formed into successive bags that are successively filled and sealed.
23. A method of making reclosable plastic bags, the method comprising the acts of:
mounting a plurality of sliders to a continuous length of fastener by inserting the plurality of sliders through notches in the continuous length of fastener, the fastener including mating male and female profiles, each of the notches extending into the male and female profiles and having a length parallel to the lengths of the profiles that allows for insertion of one of the sliders;
attaching the continuous length of fastener to a moving web of plastic film;
and after mounting the sliders to the fastener and attaching the fastener to the moving web, conveying the moving web to a form-fill-seal machine where the web is formed into successive bags that are filled and sealed.
mounting a plurality of sliders to a continuous length of fastener by inserting the plurality of sliders through notches in the continuous length of fastener, the fastener including mating male and female profiles, each of the notches extending into the male and female profiles and having a length parallel to the lengths of the profiles that allows for insertion of one of the sliders;
attaching the continuous length of fastener to a moving web of plastic film;
and after mounting the sliders to the fastener and attaching the fastener to the moving web, conveying the moving web to a form-fill-seal machine where the web is formed into successive bags that are filled and sealed.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/637,038 | 2000-08-10 | ||
US09/637,038 US6871473B1 (en) | 2000-08-10 | 2000-08-10 | Method and apparatus for making reclosable plastic bags using a pre-applied slider-operated fastener |
PCT/US2001/041463 WO2002012064A1 (en) | 2000-08-10 | 2001-07-30 | Method and apparatus for making reclosable plastic bags using a pre-applied slider-operated fastener |
Publications (2)
Publication Number | Publication Date |
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CA2385702A1 CA2385702A1 (en) | 2002-02-14 |
CA2385702C true CA2385702C (en) | 2007-06-05 |
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Application Number | Title | Priority Date | Filing Date |
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CA002385702A Expired - Lifetime CA2385702C (en) | 2000-08-10 | 2001-07-30 | Method and apparatus for making reclosable plastic bags using a pre-applied slider-operated fastener |
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US (2) | US6871473B1 (en) |
EP (1) | EP1309487B1 (en) |
JP (1) | JP5002789B2 (en) |
AT (1) | ATE449004T1 (en) |
AU (1) | AU7728201A (en) |
CA (1) | CA2385702C (en) |
DE (1) | DE60140547D1 (en) |
ES (1) | ES2335085T3 (en) |
WO (1) | WO2002012064A1 (en) |
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-
2000
- 2000-08-10 US US09/637,038 patent/US6871473B1/en not_active Expired - Lifetime
-
2001
- 2001-07-30 DE DE60140547T patent/DE60140547D1/en not_active Expired - Lifetime
- 2001-07-30 AU AU77282/01A patent/AU7728201A/en not_active Withdrawn
- 2001-07-30 EP EP01955081A patent/EP1309487B1/en not_active Expired - Lifetime
- 2001-07-30 WO PCT/US2001/041463 patent/WO2002012064A1/en not_active Application Discontinuation
- 2001-07-30 JP JP2002517376A patent/JP5002789B2/en not_active Expired - Lifetime
- 2001-07-30 AT AT01955081T patent/ATE449004T1/en not_active IP Right Cessation
- 2001-07-30 ES ES01955081T patent/ES2335085T3/en not_active Expired - Lifetime
- 2001-07-30 CA CA002385702A patent/CA2385702C/en not_active Expired - Lifetime
-
2004
- 2004-11-24 US US10/998,115 patent/US7093409B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
ES2335085T3 (en) | 2010-03-22 |
EP1309487B1 (en) | 2009-11-18 |
WO2002012064A1 (en) | 2002-02-14 |
US6871473B1 (en) | 2005-03-29 |
CA2385702A1 (en) | 2002-02-14 |
EP1309487A4 (en) | 2005-01-05 |
JP5002789B2 (en) | 2012-08-15 |
AU7728201A (en) | 2002-02-18 |
EP1309487A1 (en) | 2003-05-14 |
US20050086911A1 (en) | 2005-04-28 |
DE60140547D1 (en) | 2009-12-31 |
US7093409B2 (en) | 2006-08-22 |
JP2004505807A (en) | 2004-02-26 |
ATE449004T1 (en) | 2009-12-15 |
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