CA2443888C - Method for preparing air channel-equipped film for use in vacuum package - Google Patents
Method for preparing air channel-equipped film for use in vacuum package Download PDFInfo
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- CA2443888C CA2443888C CA002443888A CA2443888A CA2443888C CA 2443888 C CA2443888 C CA 2443888C CA 002443888 A CA002443888 A CA 002443888A CA 2443888 A CA2443888 A CA 2443888A CA 2443888 C CA2443888 C CA 2443888C
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- Prior art keywords
- heat
- layer
- cooling roll
- film
- layer film
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/06—Embossing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/22—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
- B29C43/222—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length characterised by the shape of the surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/22—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
- B29C43/28—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
- B29C59/02—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing
- B29C59/04—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing using rollers or endless belts
- B29C59/046—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing using rollers or endless belts for layered or coated substantially flat surfaces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
- B65D31/02—Bags or like containers made of paper and having structural provision for thickness of contents with laminated walls
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
- B65D81/18—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient
- B65D81/20—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient under vacuum or superatmospheric pressure, or in a special atmosphere, e.g. of inert gas
- B65D81/2007—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient under vacuum or superatmospheric pressure, or in a special atmosphere, e.g. of inert gas under vacuum
- B65D81/2023—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient under vacuum or superatmospheric pressure, or in a special atmosphere, e.g. of inert gas under vacuum in a flexible container
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
- B65D81/18—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient
- B65D81/20—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient under vacuum or superatmospheric pressure, or in a special atmosphere, e.g. of inert gas
- B65D81/2007—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient under vacuum or superatmospheric pressure, or in a special atmosphere, e.g. of inert gas under vacuum
- B65D81/2038—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient under vacuum or superatmospheric pressure, or in a special atmosphere, e.g. of inert gas under vacuum with means for establishing or improving vacuum
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2439/00—Containers; Receptacles
- B32B2439/02—Open containers
- B32B2439/06—Bags, sacks, sachets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
- B32B37/15—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state
- B32B37/153—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state at least one layer is extruded and immediately laminated while in semi-molten state
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- 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
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
-
- 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
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
- Y10T428/1334—Nonself-supporting tubular film or bag [e.g., pouch, envelope, packet, etc.]
-
- 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
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
- Y10T428/1334—Nonself-supporting tubular film or bag [e.g., pouch, envelope, packet, etc.]
- Y10T428/1341—Contains vapor or gas barrier, polymer derived from vinyl chloride or vinylidene chloride, or polymer containing a vinyl alcohol unit
-
- 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
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
- Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
- Y10T428/1379—Contains vapor or gas barrier, polymer derived from vinyl chloride or vinylidene chloride, or polymer containing a vinyl alcohol unit
-
- 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
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
- Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
- Y10T428/139—Open-ended, self-supporting conduit, cylinder, or tube-type article
- Y10T428/1393—Multilayer [continuous layer]
Abstract
Disclosed is a method for preparing an air channel-equipped film for use in vacuum packages, which comprises the step of providing a gas-impermeable base, along with a melt-extruded heat-sealable resin, to a laminating unit consisting roll and a cooling roll. to form a heat-sealable resin layer on the gas-impermeable base, charaterized in that the heat-sealable resin is molded and quenched in such a way that a plurality of protrusions, corresponding to a plurality of grooves formed in a predetermined pattern on the circumferential surface of the cooling roll, are formed on the molded heat-sealable resin layer, defining channels for the evacuation of air therebetween. The method is simple because of its ability to form air channels without the aid of additional embossing techniques, as weel as being economically favorable owing to the employment of no embossing molds.
Description
1\/IETHOD FOR PREPARING AIR CHANNEL-EQUIPPED FILM FOR USE IN
VACUUM PACKAGE
TECHNICAL FIELD
The present invention relates to a method for preparing an air channel-equipped film for use in vacuum packages. More specifically, the present invention is directed to a method for preparing ari air channel-equipped film, in which a heat-sealable resin layer having channels for the evacuation of air fonned in a pattern defined by grooves on a cooling roll is fozmed on a gas-impermeable base layer, and a bag for use in vacuum packages produced by use of such films.
PRIOR ART
In various countries including the United States, a method of preserving perishable foods such as meats or processed meats for a long term has been widely used, comprising the steps of stuffing foods into a plastic bag capable of maintaining a vacuum therein, evacuating air from the bag by use of an air pump or another vacuum processing machine, and tightly sealing the bag.
With reference to Fig. 1, a schematic perspective view of the conventional bag for use in vacuum packages is illustrated. The conventional bag comprises a main body 110 with both sheets 111 and 112 consisting of a plastic-based film;
a sealed part 120 in which a lower, a left, and a right edge of the main body 110 are heat-sealed so as to form an inner space for receiving perishable products such as foods; and an unsealed part 130 provided at an upper edge of the main body 110, through which perishable products are stuffed into the main body 110 and air is evacuated fi=om the inside of the main body 110. At this time, the main body 10 is generally made of a thermoplastic polyethylene resin which is melted by heat and is harmless to a human body.
WO 02/074522 PCT/IiR02/00283 After foods are stuffed through the unsealed part 130 into the bag and air is evacuated from the inside of the bag by use of an air pump or another vacuum processing maclune, the unsealed part is heated to a predetermined temperature and pressed to seal the bag.
However, the bag as above is disadvantageous in that both sheets 111 and 112 of the main body 110 are quickly adhered to each other while some of air is discharged froni the bag when perishable products are stuffed into the bag and air in the bag is evacuated by use of a vacuum processing machine, and thus air remaining in the lower part of the bag may not evacuated.
To avoid the above disadvantage, a technology for forming air channels by processing the conventional sheet Nvith the aid of embossing tecluliques was developed. According to the technology, air channels are formed on one sheet or botli sheets of a film constituting the main body, and air is evacuated along the air channel from the bag during the evacuation of air in the bag by the vacuum processing machine, thereby air existing in the lower par of the bag is easily evacuated froni the bag.
U. S. Pat. No. 2,778,173 discloses a method of producing airtight packages using the above teclinology. According to this method, an evacuating opening is formed on a first sheet, and a second sheet is laid overlapped with the first sheet in such a way that the second slieet precisely overlaps the first sheet. At this time, a plurality of spacing projections are formed on at least one of the two sheets, thereby cliannels for the movement of air, connected to the openings, are foinied. In addition, the projections may take shapes of pyrainid and hemisphere, and are formed by pressing the film constituting the sheet using heated female and male dies or 2 5 various tools. Alternatively, the channels are formed by interposing a strip with projections between the first sheet and the second sheet.
According to this niethod, projections in a blank of flexible, fluid-tight sheet material to provide channels between the projections, and one sheet poi-tion of the blank is folded over another sheet portion of the blank with the projections between WO 02/074522 PCT/IiR02/00283 the sheet portions and with the peripheral edges of the sheet portions contacting each other. Then, the contacting peripheral edges are sealed to each other for part of their length to fornl an envelope having an inlet at the unsealed part of the peripheral edges.
A commodity is introduced into the envelope througli the inlet and the renlainder of the contacting peripheral edges is sealed to each other to close the inlet.
Thereafter, an evacuating opening is pierced in a part of the sheet material which coinmunicates Nvith the channels, air is removed from the interior of the envelope through the channels and opening, and the opening is sealed. However, this method is disadvantageous in that two sealing steps are additionally required after the commodity is stuffed into the envelope.
To avoid the above disadvantage, another technology was developed, in whicli a main body of the conventional bag for use in vacuum packages as shown in Fig. 1 consists of laniinated filins, and at least one sheet of the nlain body is embossed by use of an embossing mold.
Fig. 2 is a schematic perspective view of the conventional bag for use in vacuum packages, with its one side being subjected to embossing. In this technology, one film layer 113 of laininated film layers 113 and 114 constituting the main body 110 of the conventional bag for use in vacuum packages as sho 'n in Fig.
2 is embossed to foim protrusions 116 and eliannels 115 defined by tlle space between protrusions 116, so that air is readily evacuated from the bag.
Such a technology is exemplified in U. S. Pat. No. Re. 34,929. The bag for use in vacuum packages consists of a first panel and a second panel overlapping each other, and panels each having a predetermined thickness are sealed to each otlier at a lower, a left, and a right edge except an inlet for receiving products.
Furthermore, the first and the second panel each consist of a heat-sealable inner layer with a uniform thickness and a gas-impermeable outer layer with a uniform thickness, and a plurality of protrusions are fornied in a waffle-shaped patteni on an inner and an outer surface of at least one panel of the first panel and the second panel (refer to Figs. 6 a.nd 7 in U. S. Pat. No. Re. 34,929). In particular, an embossing pattern is foimed on WO 02/074522 PCT/IiR02/00283 a hot roller, and the laminated film consisting of the gas-impermeable sheet and the heat-sealable sheet is provided to the hot roller and embossed with heating to form chatulels 115 and protrusions 116. However, Nvhen the protrusions and chalulels are forcibly formed on the filnz with a predetermined tlliclcness by heat, the contacting portion between the cliannel and the protrusion is drawn and such a drawn portion of the film becomes thin. Thus, the film may be torn during the embossing, or pinholes may be formed on the film due to re-dra -ing of the film during fonning a vacuum in the bag, and so environmental air flows into the bag. Also, it is necessary to fi-equently replace the einbossing mold with a ne.w one because the film may be danlaged due to abrasion of the embossing mold when the embossing mold is used for a long time.
Meanwhile, U. S. Pat. No. 5,554,423 corresponding to EP 0 648 688 BI
discloses a bag for use in vacuum packages using another type of protrusions.
According to this patent, a tubular element for forming bags for the Nacuum-pacl:ing of products comprises a first sheet consisting of a gas-impermeable outer laver and a heat-sealable inner layer and a second sheet consisting of a gas-impeimeable outer layer and a heat-sealable inner layer, and the first sheet and the second sheet are adhered to each other at an upper and a lower edge to form a space for receiving perishable products in the bag. In particular, a plurality of lieat-sealable strand elenlents are heat bonded at regular intervals to the inner sheet of any one sheet of the first sheet and the second sheet in such awav that heat-sealable strand elements extend along a length of the tubular element substantially parallel to the upper and lower bonded edges, thereby a space between strand elements acts as a channel for the evacuation of air. In this respect, Fig. 3 schematically illustrates arrangeinent ~ 5 and heat bonding of a plurality of heat-sealable strand elenlents on the sheet.
According to this patent, a plurality of strand elenients 4 extruded from an extrusion head 2 for use in producing strand elements are as-ranged at regular intervals on the heat-sealable layer of the laminated sheet 1 consisting of the gas-impermeable layer and the heat-sealable layer, and heat bonded to a surface of the heat-sealable layer by WO 02/074522 PCT/IiR02/00283 use of pressure rollers 3 and 3'. However, this patent is disadvantageous in that separate equipments are required for producing strand elements, and a procedure of lleat bonding a plurality of strand elements at regular intenals to the heat-sealable inner layer is very complicated. Other disadvantages are that various shapes of pattern are 11ard to form, i.e. only strand type charmels are formed, and the production of the film with relatively thin thickness is difficult because the strand elenients for channels are additionally foimed on the heat-sealable inner layer having a predetermined thickness.
RefeiTing to Fig. 4, another method of preparing a film for use in vacuum packages is illustrated, in which channels are directly formed on a heat-sealable inner layer by a co-extrusion process using blowing, and the resulting heat-sealable inner layer is laminated on a gas-impenneable outer layer.
In detail, protrusions 5 are equipped on a co-extrusion ring of the inner layer, and so channels are fornied by the protiusions on the film for use in vacuum packages Nvhen the film is upwardly blown. However, this method is disadvantageous in that only stripe-sliaped ehaiuiels are foimed in itself on the film regardless of the shape of the protrusions, and so various shapes of cliannels cannot be obtained.
Furthermore, there is a limitation in making narrow a space between channels due to characteristics of the co-extrusion process using blowing, so that sheets constituting the main body of the bag are readily adhered to each other during vacuum packing. Thus, the formation of a vacuum in the bag is not sufficient.
Therefore, there renlains a need for providing a method of preparing a film for use in vacuum packages, by which more various channel patterns can be achieved with ease compared with the conventional method.
The present inventors liave conducted extensive studies into an improved method of preparing a film for use in vacuum packages, resulting in the finding that the film for use in vacuum packages, which is prepared in such a manner that a heat-sealable resin melt-extruded through a nozzle of an extruder and a gas-inipermeable base layer are provided bet-ween a laniinating roll and a cooling roll having grooves WO 02/074522 PCT/IiR02/00283 formed in a predetermined pattern on a surface thereof, thereby the heat-sealable layer with protrusions and chazulels for the evacuation of air is formed on the gas-impermeable base layer, can easily overcome the disadvantages encountered in the prior arts.
DISCLOSURE OF THE INVENTION
Therefore, it is an object of the present invention to provide a inethod of preparing a film for use in vacuum packages, which can effectively prevent pinholes from occurring and can improve an ability to form a vacuum by precisely forming channels.
It is anotlier object of the present invention to provide a metllod of preparing a film for use in vacuunl packages, in which various channel patterns of the film can be readily provided.
It is still another object of the present invention to provide a method of preparing a thin filnl witli excellent physical properties, for use in vacuum packages.
It is yet another object of the present invention to provide a bag for use in vacuum packages produced by use of the filin according to the present invention.
Based on the present invention, the above objects of the present invention can be accomplislied by a provision of a method for preparing an air charuiel-equipped filnl for use in vacuunl packages, wliich comprises the step of providing a gas-~ 0 impermeable base, along with a melt-extruded heat-sealable resin, to a laminating unit consisting of a lanlinating roll and a cooling roll, to foim a heat-sealable resin layer on the gas-impermeable base, characterized in that the heat-sealable resin is molded and cooled in such a way that a plurality of protrusions, eoiresponding to a plurality of grooves foimed in a predetermined pattern on the circumferential surface ~ 5 of the cooling roll, are formed on the molded heat-sealable resin layer, defining channels for the evacuation of air therebetween.
In addition, according to the present invention, a bag for use in vacuum WO 02/074522 PCT/IiR02/00283 packages is provided, Nvhich coniprises a first sheet and a second sheet, one overlapping the other. Each of the two sheets is composed of a lanlinated film consisting of a gas-impernleable base layer as an outer layer and a heat-sealable resin layer as an inner layer, wherein at least one of the first sheet and the second sheet is a film for use in vacuum packages produced according to the method of this invention. The first sheet and the second sheet are bonded to each other along their lower, left, and right edges so as to form a space for receiving a product to be vacuum packaged therein, BRIEF DESCRIPTION OF THE DRAWINGS
The above and other objects, features and other advantages of the =present invention will be nlore clearly understood from the following detailed description taken in conjunction with the accompanying di=awings, in which:
Fig. 1 is a schematic perspective view of the conventional bag for use in vacuum packages;
Fig. 2 is a scheniatic perspective view of the conventional bag for use in vacuum packages, with its one sheet being subjected to embossing;
Fig. 3 illustrates heat bonding of a plurality of heat-sealable strand elements onto a surface of a heat-sealable layer of a laniinated sheet comprising a gas-iinpenneable layer and the heat-sealable layer according to the conventional method;, Fig. 4 illustrates a formation of air cliannels by the conventional co-extrusion process using bloNving;
Fig. 5 schematically illustrates a formation of a heat-sealabel resin layer with protrusions and channels for the evacuation of air on a gas-impermeable base layer of the film according to an embodiment of the present invention;
Fig. 6 is a partial eapanded view of Fig. 5 illustrating a formation of the heat-sealable resin layer with protrusions and cliannels for the evacuation of air on WO 02/074522 PCT/IiR02/00283 the gas-impermeable base layer of the film according to the embodiment of the present invention;
Fig. 7 is a schematic pai-tial perspective view of an extruder shown in Fig.
5, Fig. 8 is a plane vieNv of the film for use in vacuum packages accordina to an einbodiment of the present invention;
Fig. 9 is a plane view of the filni for use in vacuum packages according to another embodiment of the present invention; and Fig. 10 is a schematic perspective view of a bag for use in vacuum packages according to a further embodiment of the present invention.
With reference to Fig. 5, formation of a heat-sealable resin layer with protrusions and air channels on a gas-impeimeable base layer according to an embodinlent of the present invention is schematically illustrated. A
laminating roll 20' and a cooling roll 20 constituting a lanlinating unit are arranged at regular intervals so that the melt-extruded heat-sealable resin layer is stacked on the gas-impermeable base layer Nvhile the heat-sealable resin is cooled. Illustrative, but non-limiting examples of materials of the lanlinating roll and the cooling roll include steel and rubber. The space between the laniinating roll and the coolina roll is desirably 10 controlled according to specifications (for example, thickness) of the film for use in vacuum packages. It is preferable to control the temperature of the cooling roll in a range of about -15 to about -10 C so that the melt-extruded resin is cooled.
How,ever, the temperature of the cooling roll may be varied according to a laminating condition.
Typically, the cooling roll has a larger diameter than the laminating roll, for example, the diameter of the cooling roll is about 1.5 to about 3 times as large as that of the laminating roll. This range is set forth to illustrate, but is not to be construed WO 02/074522 PCT/IiR02/00283 to limit the diameter of the cooling roll, The gas-impermeable base 10 is fed to the nip between the cooling roll 20 and the laminating roll 20' by a feeding means (not shown in Fig. 5). Examples of the gas-impermeable base include polyester, polyamide, and EVOH (ethylene vinyl alcohol), alid it is preferable that the gas-impermeable base is made of materials capable of secul-ing mechanical properties when subject to heating in the process of the subsequent vacuuni packaging.
The heat-sealable resin is typically made of a thennoplastic resin. After perishable products are stuffed into a bag for use in vacuum packages produced by using a laminated film of the present invention and air which is present in the bag is evacuated, the heat-sealable resin layer of the two sheets in contact with each otlier while being heated, should be strongly bonded to each otlier so as to prevent environmental air from penetrating into the bag. In particular, it is preferable that the heat-sealable resin is made of polyethylene (PE) suitable to preserve foods and harmless to a human body.
In Fig. an extruder 30 is positioned in such a way that the nielt-extruded heat-sealable resin is layered on the base layer by feeding the extruded heat-sealable resin to the nip between the cooling roll 20 and the laniinating roll 20'. The heat-sealable resin is fed through a nozzle 31 of the extruder 30, At this time, the temperature of the melt-extruded heat-sealable resin depends on a kind of the used resin, and preferably, ranges froin about 200 to about 250 C. Furthei7nore, the amount of resin to be extruded into the laminating unit depends on the required thickness of the heat-sealable resin layer to be positioned on the base layer.
According to the present invention, a plurality of grooves are formed in a predetermined pattern on the circumferential surface of the cooling roll 20.
In Fig. 5, a film for use in vacuum packages according to an embodiment of the present invention is illustrated, in which the heat-sealable resin layer is molded in such a way that protrusions corresponding to illustrative-shaped grooves formed in a predetermined pattern on the circumferential surface of the cooling roll and air WO 02/074522 PCT/IiR02/00283 channels defined by the space between the protrusions, are formed on the molded heat-sealable resin layer.
As described above, according to the present invention, the heat-sealable resin melt-extruded by the extruder is fed through the nozzle of the extruder, and naturally molded by the grooves of the cooling roll while being cooled. The melt-extruded heat-sealable resin is fed along with the base layer to a laminating unit consisting of the laminating roll and the cooling roll having the grooves formed in a predetermined pattern, and the heat-sealable resin is molded in such a way that a plurality of protrusions, corresponding to the grooves fornied on the circumferential surface of the cooling roll, are formed on the molded heat-sealable resin layer, defining channels for the evacuation of air therebetween, thereby the film for use in vacuum packages 40 of the present invention can be prepared. The pattern of the arooves can be formed in desired various shapes such as straight lines and curved lines according to shapes of desired cliannels, and the shape of the pattern is not limited. Unlike the conventional method adopting a post-enlbossing treatment, in case that the melt-extruded heat-sealable resin is molded and cooled by use of the grooves according to the present invention, the performance of securing a vacuum by use of the inelt-extruded heat-sealable resin is not poor, even though the heat-sealable resin layer is kept thin.
~ 0 Fig. 6 is a partial expanded view of Fig. 5 illustrating formation of the heat-sealable resin layer Nvith protrusions and channels for the evacuation of air on the gas-impeinieable base layer, and Fig. 7 is a schematic partial perspective view of an extruder shoNvn in Fig. 5. The extruded heat-sealable resin is fed through a nozzle 32 of a nozzle part 31 to the laminating unit, as shown in Fig. 7.
With reference to Figs. 5 to 7, the base 10 is fed to the nip between the cooling roll 20 and the laminating roll 20' constituting the laminating unit.
At this time, a plurality of grooves 21 are formed in a predeteimined pattern on the circumferential surface of the cooling roll 20. According to the embodiment illustrated in Fig. 5, each of the grooves is fornied in an uneven pattern on the WO 02/074522 PCT/IiR02/00283 circumferential surface of the cooling roll 20 such that each groove is symnietrical with neighboring grooves.
Moreover, the extruder 30 is positioned between the cooling roll 20 having the grooves 21 with a predetermined pattern and the laminating roll 20', and the heat-sealable resin extruded by the nozzle 32 of the exti-uder 30 is pressed, along with the base 10, by the cooling roll 20 and the laminating roll 20' constituting the laminating unit to form protrusions coiTesponding to the grooves of the cooling roll 20 on the heat-sealable resin layer foimed on the upper surface of the film 40 for use in vacuum packages. At this time, channels for the evacuation of air are foime.d on the heat-sealable resin layer at positions between protrusions fortned by the grooves 21 of the cooling roll 20.
According to the present invention, the channels niay be foi7iied in such a way that a plurality of stripes or crossed stripes are longitudinally extended on the film. The stripe- or cross stripe-shaped chaiinels are, set forth to illustrate, but are not to be construed to limit the shape of the channel. Therefore, any shapes of the channels can be applied to a bag for use in vacuum packages of the present invention.
With reference to Figs. 5 and 6, the grooves are formed in a predetermined uneven pattern on the circumferential surface of the cooling roll, and so a plurality of protrusions are foimed on the heat-sealable resin layer and define cliannels therebetween, which act as channels for the nlovenient of air. Therefore, the shape of the charuiels of the present invention is detei7nined by the pattern on the cooling roll. On the other hand, the cooling roll having protrusions with the uneven pattern may be employed, so that the resulting cliannels take an uneven pattern.
Referring to Fig. 8, a plane view of the film for use in vacuum packages % 5 according to an embodinient of the present invention is illustrated, in Nvhich a plurality of protrusions with the uneven pattern are positioned on the film and channels formed at the gaps between the protrusions are longitudinally extended.
Therefore, air remaining in the bag is smoothly evacuated along the channels during the evacuation of air.
WO 02/074522 PCT/IiR02/00283 Turning noNv to Fig. 9, a plane view of a film for use in vacuum packages according to another enZbodiment of the present invention is illustrated. In this enibodiment, a plurality of grooves are formed in a wave pattern on the circuinferential surface of the cooling roll, a1id thus channels defined by the gaps betNveen protrusions take the shape of the wave pattern.
Meanwhile, the thickness of each protrusion formed on the heat-sealable resin layer of a laminated film 40 is deternlined by the depth of grooves 21 formed on the cooling roll 20, and the width of the channel is determined by the interval between the grooves 21. Thus, the sliape, width, and thickness of the channels for the evacuation of air, defined by the gaps between protrusions are controlled by changing the specifications for the grooves of the cooling roll according to use of the laminated film.
In the heat-sealable resin layer having such channels, it is typical that each charuiel ranges from about 40 to about 100 pan in depth, each protiusion and the base layer are about 150 to about 300 /m and about 30 to about 200 /.cm in thickness, respectively. Hoxever, the dinzensions of the ehaiuiel, the protrusion, and the base layer are set fortli to illustrate, but are not to be construed to limit the dimensions.
According to the present invention, the base layer may consist of one layer, or two or more layers. When employing a multilayer-stiuctured base layer, it should be understood that a total thickness tllereof is also adjusted within the allowable range for the base laver.
With reference to Fig. 10, a bag for use in vacuum packages produced by using the film of the present invention is illustrated, in which the bag 50 for use in vacuum packages consists of a first sheet 51 and a second sheet 52 overlapping each ~ 5 other, and chaiinels are formed on any one of the first sheet 51 and the second sheet 52. At this time, the heat-sealable resin layer and the base layer of each sheet are typically made of the same inaterial as those of the other sheet, but they may also be made of different materials. The heat-sealable resin layer is used as an inner layer and the base layer is used as an outer layer. In addition, lower, left, and right edges WO 02/074522 PCT/IiR02/00283 of the first and the second sheet are bonded to each other so as to form a space for receiving a product to be vacuum packaged. In case of using the sheet on which channels are not formed, the sheet ranges fronl about 50 to about 150 ;-~n in thickness. In Fig. 10, channels with a predetermined pattern are formed on any one of the first sheet and the second sheet. However, it should be understand that a film, in which channels with a predetermined pattern are formed, may be useful as the material of botli the first sheet and the second sheet of the bag for use in N'aeuum packages of this invention. Furthermore, various shapes of bags for use in vacuum packages can be prepared by using the laminated film having channels of the present invention.
A better understanding of the present invention ma5, be obtained by reading the following examples which are set fortl-i to illustrate, but are not to be construed to limit the present invention.
A polyamide base layer with a%vidth of 1200 nun and a thickness of 75 uni was fed to a laniinating unit at a rate of 80 m/min, as shown in Fig. 5. A
laminating roll and a cooling roll made of steel were 2250 (D and 500 (t, in diameter, respectively, and the deptli of each groove on the cooling roll was 0.8 mni.
The gap between the laminatina roll and the cooling roll -,vas 100 ,cmi, and an extruder vv-as L 0 positioned around the nip between the laminating roll and the cooling roll so that a nielt-extruded polyethylene resin (CA-110 made by SK Corp.) at 220 C"vas fed from a nozzle of the extruder to the laminating unit to produce a film for use in vacuum packages. At this time, the tenlperature of the cooling roll Nvas -12 C .
The film for use in vacuum packages thus produce.d comprised a base layer with a thickness of 75 gm, protrusions with a thickness of ? 50 gmi, and channels with a depth of 25 /.tm, and was used as a first sheet. A second sheet Nvas produced according to the same procedure as the first sheet, and combined with the first sheet to prepare a bag of 300 X 400 mm for use in vacuum packages. At this time, the second sheet does not have channels, and the base layer and the heat-sealable resin layer were 75 m and 25 m in thickness, respectively. Samples were put into the bag for use in vacuum packages, and tightly vacuum-packed by use of a vacuum packing machine (trade name:
Foodsaver 550).
100 Samples thus packed were tested for 100 hours, and then the number of bags not maintaining a vacuum state was counted. The results are given in Table 1, below.
Performance of a bag for use in vacuum packages was evaluated according to the same procedure as example 1 except that commercial Foodsaver RO made by Tilia Inc. was used as the bag. The results are described in Table 1, below.
Performance of a bag for use in vacuum packages was evaluated according to the same procedure as example 1 except that commercial MAGIC VACTM made by Flaemnouva Co. was used as the bag. The results are described in Table 1, below.
Example 1 Com. Ex. 1 Com. Ex. 2 Number of bags not maintaining vacuum 0 20 5 From the results of Table 1, it can be seen that the bag for use in vacuum packages according to example 1 of the present invention is much better than the conventional bags for use in vacuum packages in view of maintaining a vacuum state for an extended period.
WO 02/074522 PCT/IiR02/00283 INDUSTRIAL APPLICABILITY
According to a method of preparing a film for use in vacuum packages of the present invention, as described above, protrusions and channels are naturally formed on a heat-sealable resin layer by grooves of a cooling roll when a heat-sealable resin is layered on a gas-impeimeable base. Therefore, the method is simple because of its ability to form air channels without the aid of additional embossing tech.niques, as well as being economically favorable owing to the employment of no embossing molds. Also, the freedom in patterning the grooves of the cooling roll inakes it possible to foim versatile air channel patterns and to easily control the intervals between the air channels, with an increase in productivity of about 50 %
compared to the conventional techniqlies.
The present invention has been described in an illustrative manner, and it is to be understood that the terminology used is intended to be in the nature of description rather than of limitation. Many modifications and variations of the present invention are possible in light of the above teachings. Therefore, it is to be understood that within the scope of the appended claims, the invention may be practiced othenvise than as specifically described.
VACUUM PACKAGE
TECHNICAL FIELD
The present invention relates to a method for preparing an air channel-equipped film for use in vacuum packages. More specifically, the present invention is directed to a method for preparing ari air channel-equipped film, in which a heat-sealable resin layer having channels for the evacuation of air fonned in a pattern defined by grooves on a cooling roll is fozmed on a gas-impermeable base layer, and a bag for use in vacuum packages produced by use of such films.
PRIOR ART
In various countries including the United States, a method of preserving perishable foods such as meats or processed meats for a long term has been widely used, comprising the steps of stuffing foods into a plastic bag capable of maintaining a vacuum therein, evacuating air from the bag by use of an air pump or another vacuum processing machine, and tightly sealing the bag.
With reference to Fig. 1, a schematic perspective view of the conventional bag for use in vacuum packages is illustrated. The conventional bag comprises a main body 110 with both sheets 111 and 112 consisting of a plastic-based film;
a sealed part 120 in which a lower, a left, and a right edge of the main body 110 are heat-sealed so as to form an inner space for receiving perishable products such as foods; and an unsealed part 130 provided at an upper edge of the main body 110, through which perishable products are stuffed into the main body 110 and air is evacuated fi=om the inside of the main body 110. At this time, the main body 10 is generally made of a thermoplastic polyethylene resin which is melted by heat and is harmless to a human body.
WO 02/074522 PCT/IiR02/00283 After foods are stuffed through the unsealed part 130 into the bag and air is evacuated from the inside of the bag by use of an air pump or another vacuum processing maclune, the unsealed part is heated to a predetermined temperature and pressed to seal the bag.
However, the bag as above is disadvantageous in that both sheets 111 and 112 of the main body 110 are quickly adhered to each other while some of air is discharged froni the bag when perishable products are stuffed into the bag and air in the bag is evacuated by use of a vacuum processing machine, and thus air remaining in the lower part of the bag may not evacuated.
To avoid the above disadvantage, a technology for forming air channels by processing the conventional sheet Nvith the aid of embossing tecluliques was developed. According to the technology, air channels are formed on one sheet or botli sheets of a film constituting the main body, and air is evacuated along the air channel from the bag during the evacuation of air in the bag by the vacuum processing machine, thereby air existing in the lower par of the bag is easily evacuated froni the bag.
U. S. Pat. No. 2,778,173 discloses a method of producing airtight packages using the above teclinology. According to this method, an evacuating opening is formed on a first sheet, and a second sheet is laid overlapped with the first sheet in such a way that the second slieet precisely overlaps the first sheet. At this time, a plurality of spacing projections are formed on at least one of the two sheets, thereby cliannels for the movement of air, connected to the openings, are foinied. In addition, the projections may take shapes of pyrainid and hemisphere, and are formed by pressing the film constituting the sheet using heated female and male dies or 2 5 various tools. Alternatively, the channels are formed by interposing a strip with projections between the first sheet and the second sheet.
According to this niethod, projections in a blank of flexible, fluid-tight sheet material to provide channels between the projections, and one sheet poi-tion of the blank is folded over another sheet portion of the blank with the projections between WO 02/074522 PCT/IiR02/00283 the sheet portions and with the peripheral edges of the sheet portions contacting each other. Then, the contacting peripheral edges are sealed to each other for part of their length to fornl an envelope having an inlet at the unsealed part of the peripheral edges.
A commodity is introduced into the envelope througli the inlet and the renlainder of the contacting peripheral edges is sealed to each other to close the inlet.
Thereafter, an evacuating opening is pierced in a part of the sheet material which coinmunicates Nvith the channels, air is removed from the interior of the envelope through the channels and opening, and the opening is sealed. However, this method is disadvantageous in that two sealing steps are additionally required after the commodity is stuffed into the envelope.
To avoid the above disadvantage, another technology was developed, in whicli a main body of the conventional bag for use in vacuum packages as shown in Fig. 1 consists of laniinated filins, and at least one sheet of the nlain body is embossed by use of an embossing mold.
Fig. 2 is a schematic perspective view of the conventional bag for use in vacuum packages, with its one side being subjected to embossing. In this technology, one film layer 113 of laininated film layers 113 and 114 constituting the main body 110 of the conventional bag for use in vacuum packages as sho 'n in Fig.
2 is embossed to foim protrusions 116 and eliannels 115 defined by tlle space between protrusions 116, so that air is readily evacuated from the bag.
Such a technology is exemplified in U. S. Pat. No. Re. 34,929. The bag for use in vacuum packages consists of a first panel and a second panel overlapping each other, and panels each having a predetermined thickness are sealed to each otlier at a lower, a left, and a right edge except an inlet for receiving products.
Furthermore, the first and the second panel each consist of a heat-sealable inner layer with a uniform thickness and a gas-impermeable outer layer with a uniform thickness, and a plurality of protrusions are fornied in a waffle-shaped patteni on an inner and an outer surface of at least one panel of the first panel and the second panel (refer to Figs. 6 a.nd 7 in U. S. Pat. No. Re. 34,929). In particular, an embossing pattern is foimed on WO 02/074522 PCT/IiR02/00283 a hot roller, and the laminated film consisting of the gas-impermeable sheet and the heat-sealable sheet is provided to the hot roller and embossed with heating to form chatulels 115 and protrusions 116. However, Nvhen the protrusions and chalulels are forcibly formed on the filnz with a predetermined tlliclcness by heat, the contacting portion between the cliannel and the protrusion is drawn and such a drawn portion of the film becomes thin. Thus, the film may be torn during the embossing, or pinholes may be formed on the film due to re-dra -ing of the film during fonning a vacuum in the bag, and so environmental air flows into the bag. Also, it is necessary to fi-equently replace the einbossing mold with a ne.w one because the film may be danlaged due to abrasion of the embossing mold when the embossing mold is used for a long time.
Meanwhile, U. S. Pat. No. 5,554,423 corresponding to EP 0 648 688 BI
discloses a bag for use in vacuum packages using another type of protrusions.
According to this patent, a tubular element for forming bags for the Nacuum-pacl:ing of products comprises a first sheet consisting of a gas-impermeable outer laver and a heat-sealable inner layer and a second sheet consisting of a gas-impeimeable outer layer and a heat-sealable inner layer, and the first sheet and the second sheet are adhered to each other at an upper and a lower edge to form a space for receiving perishable products in the bag. In particular, a plurality of lieat-sealable strand elenlents are heat bonded at regular intervals to the inner sheet of any one sheet of the first sheet and the second sheet in such awav that heat-sealable strand elements extend along a length of the tubular element substantially parallel to the upper and lower bonded edges, thereby a space between strand elements acts as a channel for the evacuation of air. In this respect, Fig. 3 schematically illustrates arrangeinent ~ 5 and heat bonding of a plurality of heat-sealable strand elenlents on the sheet.
According to this patent, a plurality of strand elenients 4 extruded from an extrusion head 2 for use in producing strand elements are as-ranged at regular intervals on the heat-sealable layer of the laminated sheet 1 consisting of the gas-impermeable layer and the heat-sealable layer, and heat bonded to a surface of the heat-sealable layer by WO 02/074522 PCT/IiR02/00283 use of pressure rollers 3 and 3'. However, this patent is disadvantageous in that separate equipments are required for producing strand elements, and a procedure of lleat bonding a plurality of strand elements at regular intenals to the heat-sealable inner layer is very complicated. Other disadvantages are that various shapes of pattern are 11ard to form, i.e. only strand type charmels are formed, and the production of the film with relatively thin thickness is difficult because the strand elenients for channels are additionally foimed on the heat-sealable inner layer having a predetermined thickness.
RefeiTing to Fig. 4, another method of preparing a film for use in vacuum packages is illustrated, in which channels are directly formed on a heat-sealable inner layer by a co-extrusion process using blowing, and the resulting heat-sealable inner layer is laminated on a gas-impenneable outer layer.
In detail, protrusions 5 are equipped on a co-extrusion ring of the inner layer, and so channels are fornied by the protiusions on the film for use in vacuum packages Nvhen the film is upwardly blown. However, this method is disadvantageous in that only stripe-sliaped ehaiuiels are foimed in itself on the film regardless of the shape of the protrusions, and so various shapes of cliannels cannot be obtained.
Furthermore, there is a limitation in making narrow a space between channels due to characteristics of the co-extrusion process using blowing, so that sheets constituting the main body of the bag are readily adhered to each other during vacuum packing. Thus, the formation of a vacuum in the bag is not sufficient.
Therefore, there renlains a need for providing a method of preparing a film for use in vacuum packages, by which more various channel patterns can be achieved with ease compared with the conventional method.
The present inventors liave conducted extensive studies into an improved method of preparing a film for use in vacuum packages, resulting in the finding that the film for use in vacuum packages, which is prepared in such a manner that a heat-sealable resin melt-extruded through a nozzle of an extruder and a gas-inipermeable base layer are provided bet-ween a laniinating roll and a cooling roll having grooves WO 02/074522 PCT/IiR02/00283 formed in a predetermined pattern on a surface thereof, thereby the heat-sealable layer with protrusions and chazulels for the evacuation of air is formed on the gas-impermeable base layer, can easily overcome the disadvantages encountered in the prior arts.
DISCLOSURE OF THE INVENTION
Therefore, it is an object of the present invention to provide a inethod of preparing a film for use in vacuum packages, which can effectively prevent pinholes from occurring and can improve an ability to form a vacuum by precisely forming channels.
It is anotlier object of the present invention to provide a metllod of preparing a film for use in vacuunl packages, in which various channel patterns of the film can be readily provided.
It is still another object of the present invention to provide a method of preparing a thin filnl witli excellent physical properties, for use in vacuum packages.
It is yet another object of the present invention to provide a bag for use in vacuum packages produced by use of the filin according to the present invention.
Based on the present invention, the above objects of the present invention can be accomplislied by a provision of a method for preparing an air charuiel-equipped filnl for use in vacuunl packages, wliich comprises the step of providing a gas-~ 0 impermeable base, along with a melt-extruded heat-sealable resin, to a laminating unit consisting of a lanlinating roll and a cooling roll, to foim a heat-sealable resin layer on the gas-impermeable base, characterized in that the heat-sealable resin is molded and cooled in such a way that a plurality of protrusions, eoiresponding to a plurality of grooves foimed in a predetermined pattern on the circumferential surface ~ 5 of the cooling roll, are formed on the molded heat-sealable resin layer, defining channels for the evacuation of air therebetween.
In addition, according to the present invention, a bag for use in vacuum WO 02/074522 PCT/IiR02/00283 packages is provided, Nvhich coniprises a first sheet and a second sheet, one overlapping the other. Each of the two sheets is composed of a lanlinated film consisting of a gas-impernleable base layer as an outer layer and a heat-sealable resin layer as an inner layer, wherein at least one of the first sheet and the second sheet is a film for use in vacuum packages produced according to the method of this invention. The first sheet and the second sheet are bonded to each other along their lower, left, and right edges so as to form a space for receiving a product to be vacuum packaged therein, BRIEF DESCRIPTION OF THE DRAWINGS
The above and other objects, features and other advantages of the =present invention will be nlore clearly understood from the following detailed description taken in conjunction with the accompanying di=awings, in which:
Fig. 1 is a schematic perspective view of the conventional bag for use in vacuum packages;
Fig. 2 is a scheniatic perspective view of the conventional bag for use in vacuum packages, with its one sheet being subjected to embossing;
Fig. 3 illustrates heat bonding of a plurality of heat-sealable strand elements onto a surface of a heat-sealable layer of a laniinated sheet comprising a gas-iinpenneable layer and the heat-sealable layer according to the conventional method;, Fig. 4 illustrates a formation of air cliannels by the conventional co-extrusion process using bloNving;
Fig. 5 schematically illustrates a formation of a heat-sealabel resin layer with protrusions and channels for the evacuation of air on a gas-impermeable base layer of the film according to an embodiment of the present invention;
Fig. 6 is a partial eapanded view of Fig. 5 illustrating a formation of the heat-sealable resin layer with protrusions and cliannels for the evacuation of air on WO 02/074522 PCT/IiR02/00283 the gas-impermeable base layer of the film according to the embodiment of the present invention;
Fig. 7 is a schematic pai-tial perspective view of an extruder shown in Fig.
5, Fig. 8 is a plane vieNv of the film for use in vacuum packages accordina to an einbodiment of the present invention;
Fig. 9 is a plane view of the filni for use in vacuum packages according to another embodiment of the present invention; and Fig. 10 is a schematic perspective view of a bag for use in vacuum packages according to a further embodiment of the present invention.
With reference to Fig. 5, formation of a heat-sealable resin layer with protrusions and air channels on a gas-impeimeable base layer according to an embodinlent of the present invention is schematically illustrated. A
laminating roll 20' and a cooling roll 20 constituting a lanlinating unit are arranged at regular intervals so that the melt-extruded heat-sealable resin layer is stacked on the gas-impermeable base layer Nvhile the heat-sealable resin is cooled. Illustrative, but non-limiting examples of materials of the lanlinating roll and the cooling roll include steel and rubber. The space between the laniinating roll and the coolina roll is desirably 10 controlled according to specifications (for example, thickness) of the film for use in vacuum packages. It is preferable to control the temperature of the cooling roll in a range of about -15 to about -10 C so that the melt-extruded resin is cooled.
How,ever, the temperature of the cooling roll may be varied according to a laminating condition.
Typically, the cooling roll has a larger diameter than the laminating roll, for example, the diameter of the cooling roll is about 1.5 to about 3 times as large as that of the laminating roll. This range is set forth to illustrate, but is not to be construed WO 02/074522 PCT/IiR02/00283 to limit the diameter of the cooling roll, The gas-impermeable base 10 is fed to the nip between the cooling roll 20 and the laminating roll 20' by a feeding means (not shown in Fig. 5). Examples of the gas-impermeable base include polyester, polyamide, and EVOH (ethylene vinyl alcohol), alid it is preferable that the gas-impermeable base is made of materials capable of secul-ing mechanical properties when subject to heating in the process of the subsequent vacuuni packaging.
The heat-sealable resin is typically made of a thennoplastic resin. After perishable products are stuffed into a bag for use in vacuum packages produced by using a laminated film of the present invention and air which is present in the bag is evacuated, the heat-sealable resin layer of the two sheets in contact with each otlier while being heated, should be strongly bonded to each otlier so as to prevent environmental air from penetrating into the bag. In particular, it is preferable that the heat-sealable resin is made of polyethylene (PE) suitable to preserve foods and harmless to a human body.
In Fig. an extruder 30 is positioned in such a way that the nielt-extruded heat-sealable resin is layered on the base layer by feeding the extruded heat-sealable resin to the nip between the cooling roll 20 and the laniinating roll 20'. The heat-sealable resin is fed through a nozzle 31 of the extruder 30, At this time, the temperature of the melt-extruded heat-sealable resin depends on a kind of the used resin, and preferably, ranges froin about 200 to about 250 C. Furthei7nore, the amount of resin to be extruded into the laminating unit depends on the required thickness of the heat-sealable resin layer to be positioned on the base layer.
According to the present invention, a plurality of grooves are formed in a predetermined pattern on the circumferential surface of the cooling roll 20.
In Fig. 5, a film for use in vacuum packages according to an embodiment of the present invention is illustrated, in which the heat-sealable resin layer is molded in such a way that protrusions corresponding to illustrative-shaped grooves formed in a predetermined pattern on the circumferential surface of the cooling roll and air WO 02/074522 PCT/IiR02/00283 channels defined by the space between the protrusions, are formed on the molded heat-sealable resin layer.
As described above, according to the present invention, the heat-sealable resin melt-extruded by the extruder is fed through the nozzle of the extruder, and naturally molded by the grooves of the cooling roll while being cooled. The melt-extruded heat-sealable resin is fed along with the base layer to a laminating unit consisting of the laminating roll and the cooling roll having the grooves formed in a predetermined pattern, and the heat-sealable resin is molded in such a way that a plurality of protrusions, corresponding to the grooves fornied on the circumferential surface of the cooling roll, are formed on the molded heat-sealable resin layer, defining channels for the evacuation of air therebetween, thereby the film for use in vacuum packages 40 of the present invention can be prepared. The pattern of the arooves can be formed in desired various shapes such as straight lines and curved lines according to shapes of desired cliannels, and the shape of the pattern is not limited. Unlike the conventional method adopting a post-enlbossing treatment, in case that the melt-extruded heat-sealable resin is molded and cooled by use of the grooves according to the present invention, the performance of securing a vacuum by use of the inelt-extruded heat-sealable resin is not poor, even though the heat-sealable resin layer is kept thin.
~ 0 Fig. 6 is a partial expanded view of Fig. 5 illustrating formation of the heat-sealable resin layer Nvith protrusions and channels for the evacuation of air on the gas-impeinieable base layer, and Fig. 7 is a schematic partial perspective view of an extruder shoNvn in Fig. 5. The extruded heat-sealable resin is fed through a nozzle 32 of a nozzle part 31 to the laminating unit, as shown in Fig. 7.
With reference to Figs. 5 to 7, the base 10 is fed to the nip between the cooling roll 20 and the laminating roll 20' constituting the laminating unit.
At this time, a plurality of grooves 21 are formed in a predeteimined pattern on the circumferential surface of the cooling roll 20. According to the embodiment illustrated in Fig. 5, each of the grooves is fornied in an uneven pattern on the WO 02/074522 PCT/IiR02/00283 circumferential surface of the cooling roll 20 such that each groove is symnietrical with neighboring grooves.
Moreover, the extruder 30 is positioned between the cooling roll 20 having the grooves 21 with a predetermined pattern and the laminating roll 20', and the heat-sealable resin extruded by the nozzle 32 of the exti-uder 30 is pressed, along with the base 10, by the cooling roll 20 and the laminating roll 20' constituting the laminating unit to form protrusions coiTesponding to the grooves of the cooling roll 20 on the heat-sealable resin layer foimed on the upper surface of the film 40 for use in vacuum packages. At this time, channels for the evacuation of air are foime.d on the heat-sealable resin layer at positions between protrusions fortned by the grooves 21 of the cooling roll 20.
According to the present invention, the channels niay be foi7iied in such a way that a plurality of stripes or crossed stripes are longitudinally extended on the film. The stripe- or cross stripe-shaped chaiinels are, set forth to illustrate, but are not to be construed to limit the shape of the channel. Therefore, any shapes of the channels can be applied to a bag for use in vacuum packages of the present invention.
With reference to Figs. 5 and 6, the grooves are formed in a predetermined uneven pattern on the circumferential surface of the cooling roll, and so a plurality of protrusions are foimed on the heat-sealable resin layer and define cliannels therebetween, which act as channels for the nlovenient of air. Therefore, the shape of the charuiels of the present invention is detei7nined by the pattern on the cooling roll. On the other hand, the cooling roll having protrusions with the uneven pattern may be employed, so that the resulting cliannels take an uneven pattern.
Referring to Fig. 8, a plane view of the film for use in vacuum packages % 5 according to an embodinient of the present invention is illustrated, in Nvhich a plurality of protrusions with the uneven pattern are positioned on the film and channels formed at the gaps between the protrusions are longitudinally extended.
Therefore, air remaining in the bag is smoothly evacuated along the channels during the evacuation of air.
WO 02/074522 PCT/IiR02/00283 Turning noNv to Fig. 9, a plane view of a film for use in vacuum packages according to another enZbodiment of the present invention is illustrated. In this enibodiment, a plurality of grooves are formed in a wave pattern on the circuinferential surface of the cooling roll, a1id thus channels defined by the gaps betNveen protrusions take the shape of the wave pattern.
Meanwhile, the thickness of each protrusion formed on the heat-sealable resin layer of a laminated film 40 is deternlined by the depth of grooves 21 formed on the cooling roll 20, and the width of the channel is determined by the interval between the grooves 21. Thus, the sliape, width, and thickness of the channels for the evacuation of air, defined by the gaps between protrusions are controlled by changing the specifications for the grooves of the cooling roll according to use of the laminated film.
In the heat-sealable resin layer having such channels, it is typical that each charuiel ranges from about 40 to about 100 pan in depth, each protiusion and the base layer are about 150 to about 300 /m and about 30 to about 200 /.cm in thickness, respectively. Hoxever, the dinzensions of the ehaiuiel, the protrusion, and the base layer are set fortli to illustrate, but are not to be construed to limit the dimensions.
According to the present invention, the base layer may consist of one layer, or two or more layers. When employing a multilayer-stiuctured base layer, it should be understood that a total thickness tllereof is also adjusted within the allowable range for the base laver.
With reference to Fig. 10, a bag for use in vacuum packages produced by using the film of the present invention is illustrated, in which the bag 50 for use in vacuum packages consists of a first sheet 51 and a second sheet 52 overlapping each ~ 5 other, and chaiinels are formed on any one of the first sheet 51 and the second sheet 52. At this time, the heat-sealable resin layer and the base layer of each sheet are typically made of the same inaterial as those of the other sheet, but they may also be made of different materials. The heat-sealable resin layer is used as an inner layer and the base layer is used as an outer layer. In addition, lower, left, and right edges WO 02/074522 PCT/IiR02/00283 of the first and the second sheet are bonded to each other so as to form a space for receiving a product to be vacuum packaged. In case of using the sheet on which channels are not formed, the sheet ranges fronl about 50 to about 150 ;-~n in thickness. In Fig. 10, channels with a predetermined pattern are formed on any one of the first sheet and the second sheet. However, it should be understand that a film, in which channels with a predetermined pattern are formed, may be useful as the material of botli the first sheet and the second sheet of the bag for use in N'aeuum packages of this invention. Furthermore, various shapes of bags for use in vacuum packages can be prepared by using the laminated film having channels of the present invention.
A better understanding of the present invention ma5, be obtained by reading the following examples which are set fortl-i to illustrate, but are not to be construed to limit the present invention.
A polyamide base layer with a%vidth of 1200 nun and a thickness of 75 uni was fed to a laniinating unit at a rate of 80 m/min, as shown in Fig. 5. A
laminating roll and a cooling roll made of steel were 2250 (D and 500 (t, in diameter, respectively, and the deptli of each groove on the cooling roll was 0.8 mni.
The gap between the laminatina roll and the cooling roll -,vas 100 ,cmi, and an extruder vv-as L 0 positioned around the nip between the laminating roll and the cooling roll so that a nielt-extruded polyethylene resin (CA-110 made by SK Corp.) at 220 C"vas fed from a nozzle of the extruder to the laminating unit to produce a film for use in vacuum packages. At this time, the tenlperature of the cooling roll Nvas -12 C .
The film for use in vacuum packages thus produce.d comprised a base layer with a thickness of 75 gm, protrusions with a thickness of ? 50 gmi, and channels with a depth of 25 /.tm, and was used as a first sheet. A second sheet Nvas produced according to the same procedure as the first sheet, and combined with the first sheet to prepare a bag of 300 X 400 mm for use in vacuum packages. At this time, the second sheet does not have channels, and the base layer and the heat-sealable resin layer were 75 m and 25 m in thickness, respectively. Samples were put into the bag for use in vacuum packages, and tightly vacuum-packed by use of a vacuum packing machine (trade name:
Foodsaver 550).
100 Samples thus packed were tested for 100 hours, and then the number of bags not maintaining a vacuum state was counted. The results are given in Table 1, below.
Performance of a bag for use in vacuum packages was evaluated according to the same procedure as example 1 except that commercial Foodsaver RO made by Tilia Inc. was used as the bag. The results are described in Table 1, below.
Performance of a bag for use in vacuum packages was evaluated according to the same procedure as example 1 except that commercial MAGIC VACTM made by Flaemnouva Co. was used as the bag. The results are described in Table 1, below.
Example 1 Com. Ex. 1 Com. Ex. 2 Number of bags not maintaining vacuum 0 20 5 From the results of Table 1, it can be seen that the bag for use in vacuum packages according to example 1 of the present invention is much better than the conventional bags for use in vacuum packages in view of maintaining a vacuum state for an extended period.
WO 02/074522 PCT/IiR02/00283 INDUSTRIAL APPLICABILITY
According to a method of preparing a film for use in vacuum packages of the present invention, as described above, protrusions and channels are naturally formed on a heat-sealable resin layer by grooves of a cooling roll when a heat-sealable resin is layered on a gas-impeimeable base. Therefore, the method is simple because of its ability to form air channels without the aid of additional embossing tech.niques, as well as being economically favorable owing to the employment of no embossing molds. Also, the freedom in patterning the grooves of the cooling roll inakes it possible to foim versatile air channel patterns and to easily control the intervals between the air channels, with an increase in productivity of about 50 %
compared to the conventional techniqlies.
The present invention has been described in an illustrative manner, and it is to be understood that the terminology used is intended to be in the nature of description rather than of limitation. Many modifications and variations of the present invention are possible in light of the above teachings. Therefore, it is to be understood that within the scope of the appended claims, the invention may be practiced othenvise than as specifically described.
Claims (5)
1. A method for manufacturing a multi-layer film for use in vacuum packaging applications, said multi-layer film including an inner layer having a plurality of grooves which operate to form channels suitable for evacuation of gas when said multi-layer film is used in the creation of a vacuum packaging bag, said method comprising the acts of:
heat-extruding a first material directly onto a spinning cooling roll such that a patterned inner layer made of said first material is formed upon said spinning cooling roll, said patterned inner layer having a plurality of grooves which operate to form channels suitable for evacuation of gas from said vacuum packaging bag made of said multi-layer film, said plurality of grooves formed on said patterned inner layer in conjunction with a cooling of said first material; and feeding an outer layer onto said spinning cooling roll in conjunction with said extrusion and cooling of said first material such that said outer and inner layers laminate to form two layers of said multi-layer film, wherein said plurality of grooves are formed on a first surface of said patterned inner layer and a second surface of said patterned inner layer is laminated to said outer layer.
heat-extruding a first material directly onto a spinning cooling roll such that a patterned inner layer made of said first material is formed upon said spinning cooling roll, said patterned inner layer having a plurality of grooves which operate to form channels suitable for evacuation of gas from said vacuum packaging bag made of said multi-layer film, said plurality of grooves formed on said patterned inner layer in conjunction with a cooling of said first material; and feeding an outer layer onto said spinning cooling roll in conjunction with said extrusion and cooling of said first material such that said outer and inner layers laminate to form two layers of said multi-layer film, wherein said plurality of grooves are formed on a first surface of said patterned inner layer and a second surface of said patterned inner layer is laminated to said outer layer.
2. A method for manufacturing a multi-layer film as recited in claim 1, wherein the circumferential surface of said cooling roll is patterned whereby said plurality of grooves of said inner layer are inherently molded by the pattern on the circumferential surface of said cooling roll.
3. A method for manufacturing a multi-layer film as recited in claim 2, further including the act of controlling a temperature of said cooling roll in order to properly effectuate cooling and formation of said first material into said patterned inner layer.
4. A method for manufacturing a multi-layer film as recited in claim 2, further including the act of positioning a laminating roll to apply pressure to the outer layer and extruded material in order to apply said pattern formed on the circumferential surface of said cooling roll onto said multi-layer film.
5. A method for manufacturing a multi-layer film for use in vacuum packaging applications, said multi-layer film including an inner layer having a plurality of grooves which operate to form channels suitable for evacuation of gas when said multi-layer film is used in the creation of a vacuum packaging bag, said method comprising the acts of:
heat-extruding a heat-sealable material directly onto a spinning cooling roll having a uneven pattern such that an uneven patterned inner layer made of said heat-sealable material is formed upon said spinning cooling roll, said uneven patterned inner layer having a plurality of grooves which operate to form uneven channels suitable for evacuation of gas from said vacuum packaging bag made of said multi-layer film, said plurality of grooves formed on said patterned inner layer in conjunction with a cooling of said heat-sealable material; feeding an outer layer onto said spinning cooling roll in conjunction with said extrusion and cooling of said heat-sealable material such that said outer and inner layers laminate to form two layers of said multi-layer film;
controlling a temperature of said cooling roll in order to properly effectuate cooling and formation of said heat-sealable material into said patterned inner layer; and positioning a laminating roll to apply pressure to the outer layer and extruded material in order to apply said uneven pattern formed on the circumferential surface of said cooling roll onto said multi-layer film.
heat-extruding a heat-sealable material directly onto a spinning cooling roll having a uneven pattern such that an uneven patterned inner layer made of said heat-sealable material is formed upon said spinning cooling roll, said uneven patterned inner layer having a plurality of grooves which operate to form uneven channels suitable for evacuation of gas from said vacuum packaging bag made of said multi-layer film, said plurality of grooves formed on said patterned inner layer in conjunction with a cooling of said heat-sealable material; feeding an outer layer onto said spinning cooling roll in conjunction with said extrusion and cooling of said heat-sealable material such that said outer and inner layers laminate to form two layers of said multi-layer film;
controlling a temperature of said cooling roll in order to properly effectuate cooling and formation of said heat-sealable material into said patterned inner layer; and positioning a laminating roll to apply pressure to the outer layer and extruded material in order to apply said uneven pattern formed on the circumferential surface of said cooling roll onto said multi-layer film.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR20010008724 | 2001-02-21 | ||
| KR2001/0008724 | 2001-02-21 | ||
| KR10-2002-0009064A KR100444402B1 (en) | 2001-02-21 | 2002-02-20 | Preparation Method of Film for Vacuum Package Having Air Channels |
| KR2002/0009064 | 2002-02-20 | ||
| PCT/KR2002/000283 WO2002074522A1 (en) | 2001-02-21 | 2002-02-21 | Method for preparing air channel-equipped film for use in vacuum package |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2443888A1 CA2443888A1 (en) | 2002-09-26 |
| CA2443888C true CA2443888C (en) | 2007-08-14 |
Family
ID=26638827
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002443888A Expired - Lifetime CA2443888C (en) | 2001-02-21 | 2002-02-21 | Method for preparing air channel-equipped film for use in vacuum package |
Country Status (9)
| Country | Link |
|---|---|
| US (5) | US7022058B2 (en) |
| EP (1) | EP1412167A4 (en) |
| JP (1) | JP2004519356A (en) |
| CN (1) | CN100429070C (en) |
| AU (1) | AU2002234998B2 (en) |
| CA (1) | CA2443888C (en) |
| MX (1) | MXPA03007545A (en) |
| TW (1) | TW530001B (en) |
| WO (1) | WO2002074522A1 (en) |
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-
2002
- 2002-02-21 WO PCT/KR2002/000283 patent/WO2002074522A1/en active IP Right Grant
- 2002-02-21 CN CNB028084101A patent/CN100429070C/en not_active Expired - Fee Related
- 2002-02-21 US US10/169,485 patent/US7022058B2/en not_active Expired - Lifetime
- 2002-02-21 AU AU2002234998A patent/AU2002234998B2/en not_active Ceased
- 2002-02-21 MX MXPA03007545A patent/MXPA03007545A/en active IP Right Grant
- 2002-02-21 EP EP02701765A patent/EP1412167A4/en not_active Withdrawn
- 2002-02-21 CA CA002443888A patent/CA2443888C/en not_active Expired - Lifetime
- 2002-02-21 JP JP2002573215A patent/JP2004519356A/en active Pending
- 2002-08-09 TW TW091117967A patent/TW530001B/en not_active IP Right Cessation
-
2005
- 2005-02-24 US US11/066,413 patent/US20050143243A1/en not_active Abandoned
- 2005-02-28 US US11/069,430 patent/US20050147330A1/en not_active Abandoned
- 2005-02-28 US US11/069,498 patent/US20050147774A1/en not_active Abandoned
- 2005-09-30 US US11/241,205 patent/US20060035046A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| MXPA03007545A (en) | 2004-10-15 |
| WO2002074522A1 (en) | 2002-09-26 |
| US7022058B2 (en) | 2006-04-04 |
| CN100429070C (en) | 2008-10-29 |
| EP1412167A1 (en) | 2004-04-28 |
| US20050147774A1 (en) | 2005-07-07 |
| CA2443888A1 (en) | 2002-09-26 |
| US20060035046A1 (en) | 2006-02-16 |
| US20050143243A1 (en) | 2005-06-30 |
| EP1412167A4 (en) | 2007-08-08 |
| TW530001B (en) | 2003-05-01 |
| JP2004519356A (en) | 2004-07-02 |
| CN1503722A (en) | 2004-06-09 |
| AU2002234998B2 (en) | 2005-07-28 |
| US20050147330A1 (en) | 2005-07-07 |
| US20030155269A1 (en) | 2003-08-21 |
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Legal Events
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| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20220221 |