Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS3833166 A
Publication typeGrant
Publication dateSep 3, 1974
Filing dateJan 24, 1973
Priority dateMar 24, 1971
Also published asCA984346A, CA984346A1
Publication numberUS 3833166 A, US 3833166A, US-A-3833166, US3833166 A, US3833166A
InventorsC Murray
Original AssigneeCanadian Ind
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Valve bag
US 3833166 A
Abstract
A valved plastics bag which has its valve adjacent and parallel to the top of the bag and is constructed of overlapping multi-ply panels in the front wall of the bag, the valve being formed between the panels, and one ply of the inner panel forming a sift-proof flap for the valve.
Images(2)
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

[111 3,833,166 [451 Sept. 3, 1974 [56] References Cited UNITED STATES PATENTS Charles Robertson Murray, Toronto, Ontario, Canada [73] Assignee: Canadian Industries Limited,

United States Patent Murray I VALVE BAG [75] Inventor:

Murray ABSTRACT A valved plastics bag which has its valve adjacent and "t" 6 n. S" 8 .mmm mmm HwG l 7 9 l 7 Primary ExaminerWilliam I. Price Assistant ExaminerStephen P. Garbe parallel to the top of the bag and is constructed of 108630 overlapping multi-ply panels-in the front wall of the bag, the valve being formed between the panels, and one ply of the inner panel forming a sift-proof flap for 365d 31/14 the valve. 229/625; 150/9 10 Claims, 4 Drawing Figures 'll'1 I'Ill'llllll'll'lllllll Msntsqe z. PVT/[9C9 of Q eb Canada Jan. 24, 1973 Canada................................

v Related u.s. Application Data [63] Continuation-impart of Ser. No. 210,836, Dec. 22,

Foreign Application Priority Data Mar. 24, 1971 [22] Filed:

[21] App]. N0.: 326,546

1971, abandoned.

[52] US. [51] Int. [58] Field of VALVE BAG structure after filling. However, the presence of the valve in the bag structure introduces problems in bag manufacture. In plastics bags suitable for the industrial packaging and shipping of powdered or granular products, it is desirable to attach to :the end of the valve sleeve a flap or extension formed of a thinner flexible membrane to provide the required anti-sift characteristics. The complexity of the equipment required to form this type of valve automatically has been a major drawback in plastics valved bag manufacture.

It has now been found that a suitable valved bag can be provided by forming the valve between separate panels of the front wall of the bag, and can be very easily manufactured by means of automatic bag making equipment.

In accordance with the invention, a plastics valved bag of the type comprising a back wall and a front wall joined together around the entire periphery of the bag, the front wall consisting of a first panel and a second panel, of greater combined width than the width of the back wall, said first panel at least partially overlapping said second panel throughout the length of the bag and said panels in their common area being joined together along a line substantially parallel with and at a distance from one end of the bag, thus forming a tubular selfclosing filling sleeve extending transversely of the bag adjacent to said one end thereof, with said second panel forming the inner wall of said filling sleeve, and being also joined together along at least one line extending from said first-mentioned line substantially to the opposite end of the bag, is characterized in that said second panel consists of at least two plies that are noncoextensive with each other so that at least the end portion of the inner wall of said filling sleeve is formed of a number of plies that is less than the total number of plies in said second panel.

Preferably the back wall and the two panels of the front wall all have the same number of plies, and in such case the front panels are preferably integral with the back panel, being joined to it by folds. A particularly preferred form of the bag has two plies in the back wall and in the front panels; such a bag may be made very conveniently from flattened tubular film. In such a two-ply bag, the edge of the first front panel is preferably constituted by a fold joining the plies. This may be one of the side folds of the tubular film, which may then be slit along the other fold, or, more usually, along a line close to and parallel therewith, to provide the separate plies, coextensive or non-coextensive, of the second front panel.

Two embodiments of the bag of this invention will now be more particularly described by way of example with reference to the accompanying drawings, of which:

FIG. 1 is an elevational view of the first embodiment of the bag;

FIG. 2 is a sectional view along line lI-II of FIG. *1;

FIG. 3 is an elevational view of the second and preferred embodiment of the bag; and

FIG. 4 is a sectional view along line II-ll of FIG. 3.

Corresponding reference characters indicate corresponding parts throughout the several views of the drawings.

In FIGS. 1 and 2 is shown a generally rectangular pillow-type bag, .10, having a single-ply back wall 11 and a front wall made of first and second partially overlapping panels 12 and 13. As shown, the first panel 12 is single-ply while the second panel 13 has two plies 1'6 and 17. Panel 12 and outer ply 17 of panel 13 are integral with back wall 11 and thus form with the back wall a flattened single-ply tube, which is closed at both'ends by transverse seals 14 and 15. Panel 13 lies beneath panel 12 in the area of overlap, and the free edge of its inner ply 16 which is a strip of film extending the whole length of the bag and being somewhat wider than ply 17, projects somewhat beyond the free edge of outer ply 17. A seal 18 unites both plies of panel 13 with panel 12, and a seal 19 unites the projecting end ofjply 16 of panel 13 with panel 12. The portion left unsealed in the common area of overlap at the top. end of the bag constitutes a tubular valve sleeve suitable for insertion of a filling spout..The top ends of seals 18 and 19, together with dot seals 20 delineate the tubular valve sleeve. When the bag has been filled, the projecting end portion of the inner ply 16 of panel 13 acts as a siftproof closing flap for the valve.

In FIGS. 3 and 4 is again shown a generally rectangular pillow-type bag, 10, having a two-ply back wall 21 and a front wall made of two-ply partially overlapping panels, the said first panel being shown at22 and the second at 13. Panels 22 and 13 are integral with back wall 21 and thus form with the back wall a flattened two-ply tube, which is closed at both ends by transverse seals 14 and 15. Panel 13 lies beneath panel 22 in the area of overlap, and the free edge of its inner ply 16 projects somewhat beyond the free edge of its outer ply 17. A seal, 18, unites both plies of panel 13 with the two plies of panel 22, and a seal, 19, unites theprojecting end of ply 16 of panel 13 with the two plies of panel 22. The portion-left unsealed in the common area of overlap at the top end of the bag constitutes a tubular valve sleeve, suitable for insertion of a filling spout. The top ends of seals 18 and 19, together with dot seals 20, delineate the tubular valve sleeve. When the baghas been filled, the projecting end portion of the inner ply 16 of panel 13 acts a siftproof closing flap'for the valve.

Although in the particular embodiment of the invention described with reference to FIGS. 1 to 4, the end of the valve sleeve is shown as being formed out of a projecting portion of the inner ply 16 of panel 13,.it should be understood that it can alternatively be formed by a portion of outer ply 17 projecting beyond the edge of innerply 16. In other words, either one of plies l6 and 17 can project beyond the edge of the other to form the valve closing flap. Seal 19, while not being essential, prevents the contents of the filled bag from entering the space between the panels, from which it might not be easily emptied. Dot seals 20 may be replaced by a continuous seal extending substantially parallel to transverse seal 14 from the top end of seal 18 to the inward edge of ply 16.

While, in the drawings, the valve opening of each bag is shown as being located close to one side of the bag, it should be understood that it can be located anywhere adjacent to the end seal 14 of the bag, provided that sufficient space is left between its inner mouth and the side of the bag facing it to allow insertion of a reasonably long filling spout and free delivery of filling material therefrom. Generally, it is preferred to arrange the front panels so that the valve opening is located within one vertical half of the bag, with the valve sleeve extending into or towards the other vertical half. The width of the wider front panel will not significantly exceed, and preferably is less than, the width of the back wall.

It is preferred that the longitudinal seals between the front panels, shown at 18 and.19 in FIGS. 1 and 3, stop short of and thus do not intersect transverse seal at the bottom of the bag. Such intersection might result in weakening of the end seal at the points of intersection, and thus in weakening of the bottom of the bag.

The bags are preferably made from plastics tubular film of appropriate width. Preferably the plastics film is readily heat-sealable, or is provided with a heatsealable coating. Films of olefine polymer or copolymer, or of polyvinyl chloride, are very suitable. Film of lowdensity polyethylene is particularly suitable because of its inherent heat-sealability, its toughness, and its low cost.

The bags illustrated in FIGS. 2 and 3 may each be made by continuously feeding a flattened tubing to a bag making machine, where one wall of the tubing is slit longitudinally close to one fold and that fold is thereafter unfolded. A longitudinally folded web results, having one ply somewhat wider than the other; such a web may of course, alternatively be formed by longitudinally folding a length of single sheet of the film. The web is then passed over a suitable A-frame where it is folded longitudinally to form a double-ply tubing adapted to form the back wall and the overlapping front panels of the bags. The common area between the front panels is provided at regular longitudinal intervals with the required longitudinal and transverse seals to join them together and provide the valve sleeves of successive bags. The double-ply tubing is finally transversely sealed and cut at regular intervals to provide bags as shown in the drawings. The bags may of course alternatively be made by longitudinally sealing separate sheets to provide the back wall and front panels of the bag, or any part or parts thereof, and to form the tubular web from which successive bags may be sealed and severed.

Where it is desired to make bags such as shown in FIGS. 1 and 2, a web of proper width is continuously fed to a bag making machine where it is folded longitudinally to provide the back wall 11 and overlapping panel 12 and outer ply 17 of panel 13. A single-ply tubing is so formed into which is also continuously feda strip of film which forms inner ply 16 of panel 13. The formation of the bag is then as hereinbefore defined for the double-ply bags.

It should be understood that the principles of the invention are applicable to the fabrication of bags having innermost ply projects some distance beyond the edge of the other plies and constitutes a sift-proof closing flap for the filling sleeve.

In the foregoing description, the invention has been described in connection with bags where only second panel 13 is double ply or where the back wall and first and second panels of the front wall comprise a similar number of plies. It is within the scope of this invention, however, to provide bags wherein at least one of the back wall and two panels making the front wall comprises'an individual additional ply. In such bags the additional ply is united to the other ply or plies of the bag only by top and bottom seals 14 and 15. Where, however, said additional ply is part of one or both panels of the front wall, it can be united to the other plies of said panels in the common area of overlap such as along seals 18, 19 and 20.

Bags comprising an additional ply as above described can be fabricated by simple adaptation of the method outlined hereinabove for making bags such as illustrated in FIGS. 1 to 4.v

It is not necessary for all plies of the bag to be made of the same material. In the case of the twoply bag it has been found advantageous to make the innermost ply of a plastics material that melts at a higher temperature than the plastics material of the outermost ply. Such bags are particularly useful in applications in which materials such as, for example, crystalline or powdered chemicals or pigments, are packed into the bags while hot. In one particularly preferred form of .such a bag, the inner ply is formed of film of highdensity polyethylene, and the outer ply is formed of lowdensity polyethylene. The inner ply then allows the bag to be filled with material at a temperature considerably higher than could be tolerated by a double-walled bag of low-density polyethylene film, but the outer ply, supported by the inner ply while hot, provides on cooling a wall of higher strength than would be the case with a double-walled bag of high-density polyethylene film. Other combinations of films may be selected to provide characteristics suited to particular applications. Where only the second panel of the front wall consists of two plies, the inner ply may be, for example, of a plastics material more flexible than that used for the remaining construction of the bag.

What we claim is:

1. A plastics valved bag of the type comprising a back wall and a front wall joined together around the entire periphery of the bag, the front wall consisting of a first panel and a second panel, of greater combined width than the width of the back wall, said first panel at least partially overlapping said second panel throughout the length of the bag and said panels in their common area being joined together along a line substantially parallel with and at a distance from one end of the bag, thus forming a tubular self-closing filling sleeve having inner and outer walls and extending transversely of the bag adjacent to said one end thereof, with said first panel forming the outer wall and said second panel forming the inner wall of said filling sleeve, and being also joined together along at least one line extending from said first-mentioned line substantially to the opposite end of the bag, characterized in that said second panel consists of at least two plies that are non-coextensive with each other so that at least the inner end portion of the inner wallof said filling sleeve is formed of a numher of plies that is less than the total number of plies in said second panel.

2. A bag as claimed in claim 1 in which the back wall and the front wall panels all have the same number of plies.

3. A bag as claimed in claim 2 in which the back wall and the front wall panels are all two-ply.

4. A bag as claimed in claim 1 in which the first front panel is a multi-ply panel and one of its edges is constituted by a fold.

5. A bag as claimed in claim 1 made of low-density polyethylene film.

6. A bag as claimed in claim 1 in which said first panel is in contact with the outermost ply of said second panel in the common area of the panels, and one ply of the second panel extends beyond the edge of the other plies thereof.

7. A bag as claimed in claim 2 in which the innermost ply of said first panel is in contact with the outermost ply of said second panel in the common area of the panels, and one ply of the second panel extends beyond the edge of the other plies thereof.

8. A bag as claimed in claim 2 wherein the plies are made of different heat-sealable plastics materials.

9. A bag as claimed in claim 8 wherein the innermost ply is formed of a plastics material that melts at a higher temperature than the plastics material of the outermost p y- 10. A bag as claimed in claim 8 wherein the innermost ply is formed of film of high-density polyethylene and the outermost ply is formed of film of low-density polyethylene.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2800269 *Mar 9, 1954Jul 23, 1957Milprint IncValved bag
US3221789 *Jul 5, 1963Dec 7, 1965St Regis Paper CoPlastic valve bag
US3394871 *Nov 25, 1966Jul 30, 1968Bemis Co IncBags
US3595467 *Jan 15, 1969Jul 27, 1971Goglio LuigiFlexible sealed container provided with a one-way safety valve
US3746246 *Dec 22, 1971Jul 17, 1973Canadian IndValve bag
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3937395 *Jul 22, 1974Feb 10, 1976British Visqueen LimitedVented bags
US4073429 *Jun 21, 1976Feb 14, 1978Imperial Chemical Industries LimitedPlastics bag
US4093114 *Jun 21, 1976Jun 6, 1978Imperial Chemical Industries LimitedPlastics bag
US4449243 *Sep 7, 1982May 15, 1984Cafes ColletVacuum package bag
US4470152 *Jun 14, 1982Sep 4, 1984Basic Packaging Systems, Inc.Valve bag with alignment means
US4524460 *Feb 13, 1984Jun 18, 1985Windmoller & HolscherValved sack
US4560598 *Dec 10, 1984Dec 24, 1985Stiksack Sts S.A.Plastics film and bags and sacks therefrom
US4566131 *Jun 25, 1984Jan 21, 1986Windmoller & HolscherValved bag
US4576844 *Jul 16, 1984Mar 18, 1986C-I-L Inc.Shipping bag
US4672684 *Jan 24, 1986Jun 9, 1987C I L, Inc.Thermoplastic bag
US4681781 *Feb 19, 1986Jul 21, 1987C-I-L Inc.Shipping bag
US6149304 *May 9, 1997Nov 21, 2000The Procter & Gamble CompanyFlexible storage bag with selectively-activatible closure
US7022058Feb 21, 2002Apr 4, 2006Tilia International, Inc.Method for preparing air channel-equipped film for use in vacuum package
US7087130Mar 4, 2004Aug 8, 2006Tilia International, Inc.Method for manufacturing a sealable bag having an integrated zipper for use in vacuum packaging
US7138025Mar 4, 2004Nov 21, 2006Tilia International, Inc.Method for manufacturing a sealable bag having an integrated tray for use in vacuum packaging
US7220053Dec 14, 2004May 22, 2007Sunbeam Products, Inc.Flexible composite bag for vacuum sealing
US7517484Mar 15, 2004Apr 14, 2009Sunbeam Products, Inc.Forming evacuation channels during single and multi-layer extrusion process
US7534039Jul 19, 2005May 19, 2009Sunbeam Products, Inc.Vacuum packaging films patterned with protruding cavernous structures
US7625459Dec 1, 2009Sunbeam Products, Inc.Method for manufacturing liquid-trapping bag for use in vacuum packaging
US7784160Jun 15, 2007Aug 31, 2010S.C. Johnson & Son, Inc.Pouch and airtight resealable closure mechanism therefor
US7857515Jun 15, 2007Dec 28, 2010S.C. Johnson Home Storage, Inc.Airtight closure mechanism for a reclosable pouch
US7874731Jun 15, 2007Jan 25, 2011S.C. Johnson Home Storage, Inc.Valve for a recloseable container
US7886412Mar 16, 2007Feb 15, 2011S.C. Johnson Home Storage, Inc.Pouch and airtight resealable closure mechanism therefor
US7887238Feb 15, 2011S.C. Johnson Home Storage, Inc.Flow channels for a pouch
US7946766May 24, 2011S.C. Johnson & Son, Inc.Offset closure mechanism for a reclosable pouch
US7967509Jun 15, 2007Jun 28, 2011S.C. Johnson & Son, Inc.Pouch with a valve
US8066433Nov 29, 2011Pro-Mart Industries, Inc.Valve for vacuum storage bag
US8176604May 15, 2012S.C. Johnson & Son, Inc.Pouch and airtight resealable closure mechanism therefor
US8231273Dec 17, 2010Jul 31, 2012S.C. Johnson & Son, Inc.Flow channel profile and a complementary groove for a pouch
US8827556Dec 16, 2010Sep 9, 2014S.C. Johnson & Son, Inc.Pouch and airtight resealable closure mechanism therefor
US20090226573 *Mar 7, 2008Sep 10, 2009Alejandro Gonzalez LeonPackage for granular compositions
DE3312925A1 *Apr 11, 1983Aug 16, 1984Windmoeller & HoelscherVentilsack
EP0184362A2 *Nov 22, 1985Jun 11, 1986At Plastics Inc.Thermoplastic sack
Classifications
U.S. Classification383/44, 383/109, 383/107, 383/903
International ClassificationB65D30/24
Cooperative ClassificationB65D31/14, Y10S383/903
European ClassificationB65D31/14
Legal Events
DateCodeEventDescription
Sep 3, 1991ASAssignment
Owner name: NATIONAL TRUST COMPANY A TRUST COMPANY OF ONTARIO
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:AT PLASTICS INC., A CORPORATION OF ONTARIO;REEL/FRAME:005822/0255
Effective date: 19901004
Sep 3, 1991AS02Assignment of assignor's interest
Owner name: AT PLASTICS INC., A CORPORATION OF ONTARIO
Owner name: NATIONAL TRUST COMPANY A TRUST COMPANY OF ONTARIO
Effective date: 19901004
Jun 23, 1989ASAssignment
Owner name: AT PLASTICS INC., CANADA
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:C-I-L INC.;REEL/FRAME:005156/0012
Effective date: 19890615
Owner name: NATIONAL TRUST COMPANY AS TRUSTEES
Free format text: MORTGAGE;ASSIGNOR:AT PLASTICS INC.;REEL/FRAME:005156/0016
Effective date: 19890616
Jun 23, 1989AS07Mortgage
Free format text: NATIONAL TRUST COMPANY AS TRUSTEES * AT PLASTICS INC. : 19890616
Feb 17, 1989AS01Change of name
Owner name: C-I-L- INC.,
Owner name: CANADIAN INDUSTRIES LIMITED
Effective date: 19790926
Feb 17, 1989ASAssignment
Owner name: C-I-L- INC.,
Free format text: CHANGE OF NAME;ASSIGNOR:CANADIAN INDUSTRIES LIMITED;REEL/FRAME:005026/0319
Effective date: 19790926