WO2009054590A1 - Heat shrinkable film for low temperature sealing and gas blocking - Google Patents

Heat shrinkable film for low temperature sealing and gas blocking Download PDF

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Publication number
WO2009054590A1
WO2009054590A1 PCT/KR2008/003534 KR2008003534W WO2009054590A1 WO 2009054590 A1 WO2009054590 A1 WO 2009054590A1 KR 2008003534 W KR2008003534 W KR 2008003534W WO 2009054590 A1 WO2009054590 A1 WO 2009054590A1
Authority
WO
WIPO (PCT)
Prior art keywords
resin layer
low temperature
gas blocking
temperature sealing
heat shrinkable
Prior art date
Application number
PCT/KR2008/003534
Other languages
French (fr)
Inventor
Mi Gyeong Gu
Original Assignee
Skg Plastec Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1020080030411A external-priority patent/KR20090042130A/en
Application filed by Skg Plastec Co., Ltd. filed Critical Skg Plastec Co., Ltd.
Publication of WO2009054590A1 publication Critical patent/WO2009054590A1/en

Links

Classifications

    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/304—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • 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
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B32B2307/7242—Non-permeable
    • B32B2307/7244—Oxygen barrier
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/732—Dimensional properties
    • B32B2307/734—Dimensional stability
    • B32B2307/736—Shrinkable

Definitions

  • the present invention relates to a heat shrinkable film for low temperature sealing and gas blocking, which extends a gas blocking rate and a gas blocking time and improves resistance against impact to prevent the heat shrinkable film from splitting during heat-shrink wrapping.
  • packaging materials used for packaging the food products should be superior in gas and moisture blocking performance.
  • meat and meat products contain a lot amount of moisture and are apt to be deteriorated by atmospheric temperature, so that the meat and the meat products should be kept refrigerated. Further, freshness thereof is apt to be deteriorated during circulation.
  • the heat shrinkable film shrinks in longitudinal direction and in traversal direction by a shrink ratio set at the time of manufacture while discharging air out of the film package to the outside, thereby simply sealing the inside of the film package in a vacuum state and packaging the meat product.
  • Such the heat shrinkable film for meat products is made of low temperature sealing resin such as ethylene vinyl acetate (hereinafter, referred as "EVA”) to easily shrink at low temperature with slight heat, so that the meat product may be prevented from being damaged by the heat applied to the film for the shrink of the heat shrinkable film.
  • EVA ethylene vinyl acetate
  • an apparatus for manufacturing the heat shrinkable film for meat products includes an extruder for melting and extruding synthetic resin raw materials, a drawing machine for forming a two-layered film shape from the extruded raw materials and stretching the same to assign a shrink ratio required for the film in a non-stretched state, and a winder for carrying and winding the film, as usual.
  • the heat shrinkable film has been made in a multi-layered structure for preventing the permeation of external air and water in the shrunk and sealed state after a meat product is inserted into the inside of the heat shrinkable film package.
  • a prior art heat shrinkable film for a meat product still has a disadvantage that since two layers of the film are overlapped in close contact after manufacturing of the film, it is difficult to open an inside space between the two overlapped layers for inserting a meat product into the inside space by friction force between the two overlapped layers of the film.
  • the present invention is derived to resolve the above and any other disadva ntages of the prior art.
  • a heat shrinkable film for low temperature sealing and gas blocking includes a low temperature sealing resin layer positioned at an innermost position, a first nylon layer joined outside the low temperature sealing resin layer by an adhesive layer, a gas blocking resin layer formed outside the first nylon layer for blocking gas, a second nylon layer stacked outside the gas blocking resin layer, and a finishing resin layer stacked outside the second nylon layer by an adhesive layer.
  • nylon resin layers are formed doubly so that gas blocking performance may be improved and gas blocking time may be extended.
  • the film may keep the superior resistance against impact and strength against tension by a finishing resin layer, so that the reliability and the quality of a meat product packaged by the film may be improved.
  • FIG. 1 is a cross-sectional view showing the structure of a section of a heat shrinkable film for low temperature sealing and gas blocking according to a preferred embodiment of the present invention.
  • FIG. 2 is a partially taken expanded cross-sectional view of Fig. 1.
  • Fig. 1 is a cross-sectional view showing the structure of a section of a heat shrinkable film for low temperature sealing and gas blocking according to a preferred embodiment of the present invention
  • Fig. 2 is a partially taken expanded cross- sectional view of Fig. 1.
  • the heat shrinkable film for low temperature sealing and gas blocking according to a preferred embodiment of the present invention is formed in the multi-layered tube shape of a heat shrinkable material which becomes shrunk by slight heat.
  • a heat shrinkable film is made in a multi-layered structure as shown in Fig. 1, wherein two of such films each having a thin thickness are overlapped and both side ends thereof are extended in longitudinal direction so that meat products may be inserted and packed between the films after opening the films.
  • the films may be cut by the length of the meat products inserted and packaged therebetween.
  • a low temperature sealing resin layer 10 is positioned at an innermost position of the heat shrinkable film for low temperature sealing and gas blocking, wherein the low temperature sealing resin layer 10 is stretched to be shrunk by slight heat for sealing an inside space.
  • the low temperature sealing resin layer 10 is formed of EVA resin, which is easy for heat shrinking by slight heat, wherein the EVA resin is made by stretching in a drawing machine to shrink at shrink ratio for packaging a product by slight heat after being extruded by an extruder in an apparatus for making a heat shrinkable film (not shown).
  • the low temperature sealing resin layer 10 is formed in a cylindrical tube shape with thin thickness and overlapped flat to be in two layers by being folded at both sides by rollers.
  • Fine powder which is not harmful to human is scattered evenly over the entire inner surfaces of the two overlapped layers of the low temperature sealing resin layer 10, so that the overlapped layers that are compressed by the rollers are prevented from sticking to each other.
  • the low temperature sealing resin layer 10 is made of EVA resin to obtain a shrink ratio required for slight heat so that the low temperature sealing resin layer 10 prevents the deterioration of the meat product and prevents the freshness of the meat product in spite of the slight heat required for the shrink of the film during the packaging of the meat product.
  • the low temperature sealing resin layer 10 has an advantage that the required shrink ratio can be obtained by the slight heat, the low temperature sealing resin layer 10 still has a problem that outside air may be introduced via a fine gap between the overlapped layers and deteriorate the freshness of the meat product in the case of long term keeping because gas permeability is high.
  • a first nylon layer 20 is formed outside the low temperature sealing resin layer 10 via an adhesive layer 30 formed of adhesive, and a gas blocking resin layer 40 having superior gas blocking characteristics and a second nylon layer 50 having superior waterproofness are stacked on the outside of the first nylon layer 20 in sequence.
  • a finishing resin layer 70 is formed outside the second nylon layer 50 by using an adhesive layer 60.
  • the first nylon layer 20 is interposed between the gas blocking resin layer 40 and the low temperature sealing resin layer 10 by using the adhesive layer 30 so that the gas blocking resin layer 40 is completely adhered to the outside of the low temperature sealing resin layer 10 via the first nylon layer 20.
  • the first nylon layer 20 serves to protect the gas blocking resin layer 40 and the low temperature sealing resin layer 10 from water because, the gas blocking resin layer 40 is apt to be permeated by water and the gas blocking performance thereof becomes deteriorated by the water, even though the gas blocking resin layer 40 is superior in the gas blocking performance.
  • the gas blocking resin layer 40 is made of any one substance selected from ethylene vinyl alcohol (EVOH) or poly vinylidene chloride (PVDC).
  • first nylon layer 20 and the second nylon layer 50 are formed of nylon resin, which is superior in the waterproofness and improved in strength to have high gas blocking effect and high water blocking effect.
  • the finishing resin layer 70 which is integrally adhered to the outside of the second nylon layer 50 by an adhesive layer 60 serves to protect the entire heat shrinkable film for low temperature sealing and gas blocking from deformation caused by impact and tension.
  • finishing resin layer 70 polypropylene (PP) is proper.
  • the adhesive layers 30 and 60 may be formed of any resin adhesive substances which may join other resin films such as nylon or polypropylene integrally.

Abstract

The present invention relates to a heat shrinkable film for low temperature sealing and gas blocking which extends a gas blocking rate and a gas blocking time and improves resistance against impact to prevent the heat shrinkable from splitting during heat-shrink wrapping. The heat shrinkable film of the present invention includes a low temperature sealing resin layer positioned at an innermost position, a first nylon layer joined outside the low temperature sealing resin layer by an adhesive layer, a gas blocking resin layer formed outside the first nylon layer for blocking gas, a second nylon layer stacked outside the gas blocking resin layer, and a finishing resin layer stacked outside the second nylon layer by an adhesive layer.

Description

Description
HEAT SHRINKABLE FILM FOR LOW TEMPERATURE SEALING AND GAS BLOCKING
Technical Field
[1] The present invention relates to a heat shrinkable film for low temperature sealing and gas blocking, which extends a gas blocking rate and a gas blocking time and improves resistance against impact to prevent the heat shrinkable film from splitting during heat-shrink wrapping. Background Art
[2] In general, in order to minimize the deterioration of the freshness and the quality of food product, packaging materials used for packaging the food products should be superior in gas and moisture blocking performance.
[3] Particularly, meat and meat products contain a lot amount of moisture and are apt to be deteriorated by atmospheric temperature, so that the meat and the meat products should be kept refrigerated. Further, freshness thereof is apt to be deteriorated during circulation.
[4] Therefore, heat shrinkable films, which shrink by heat, are used for the packaging of the meat products in recent days.
[5] That is, if the heat shrinkable film is heated after a meat product is packaged by the heat shrinkable film, the heat shrinkable film shrinks in longitudinal direction and in traversal direction by a shrink ratio set at the time of manufacture while discharging air out of the film package to the outside, thereby simply sealing the inside of the film package in a vacuum state and packaging the meat product.
[6] Such the heat shrinkable film for meat products is made of low temperature sealing resin such as ethylene vinyl acetate (hereinafter, referred as "EVA") to easily shrink at low temperature with slight heat, so that the meat product may be prevented from being damaged by the heat applied to the film for the shrink of the heat shrinkable film.
[7] Further, an apparatus for manufacturing the heat shrinkable film for meat products includes an extruder for melting and extruding synthetic resin raw materials, a drawing machine for forming a two-layered film shape from the extruded raw materials and stretching the same to assign a shrink ratio required for the film in a non-stretched state, and a winder for carrying and winding the film, as usual.
[8] In recent days, in order to keep the freshness of the meat product for a long time, the heat shrinkable film has been made in a multi-layered structure for preventing the permeation of external air and water in the shrunk and sealed state after a meat product is inserted into the inside of the heat shrinkable film package.
[9] A prior art heat shrinkable film for a meat product still has a disadvantage that since two layers of the film are overlapped in close contact after manufacturing of the film, it is difficult to open an inside space between the two overlapped layers for inserting a meat product into the inside space by friction force between the two overlapped layers of the film.
[10] Therefore, the meat product is exposed to the outside for a long time in the packaging procedure, which deteriorates the freshness of the meat product and makes the packaging work complicated.
[11] Further, if the heat shrinkable film for a meat product shrinks after the meat product is inserted to the inner space of the film, the meat product sticks to the inner surfaces of the film, so that the meat product becomes torn by the inner surfaces of the film while the heat shrinkable film is peeled off for cooking the meat product. Furthermore, if the heat shrinkable film shrinks excessively, the meat product becomes compressed by the shrink of the heat shrinkable film, so that the shape of the meat product becomes changed, deteriorating the appearance thereof. Disclosure of Invention Technical Problem
[12] Therefore, the present invention is derived to resolve the above and any other disadva ntages of the prior art.
[13] According to the present invention, there is an object to provide a heat shrinkable film for low temperature sealing and gas blocking, in which a powder layer is formed on an inner surface of a film that is shrinkable by slight heat for minimizing friction force causing two layers of the film to stick to each other so as to easily split the two layers from each other at the time of packaging, thereby simplifying the packaging work, improving the appearance of the packaging, and promoting the convenient peeling of the film. Technical Solution
[14] In order to accomplish the above object, a heat shrinkable film for low temperature sealing and gas blocking according to an aspect of the present invention includes a low temperature sealing resin layer positioned at an innermost position, a first nylon layer joined outside the low temperature sealing resin layer by an adhesive layer, a gas blocking resin layer formed outside the first nylon layer for blocking gas, a second nylon layer stacked outside the gas blocking resin layer, and a finishing resin layer stacked outside the second nylon layer by an adhesive layer.
Advantageous Effects
[15] According to the heat shrinkable film for low temperature sealing and gas blocking according to the present invention as described above, it is possible to prevent the deterioration of the shape of a packaged meat product due to the excessive shrink of the heat shrinkable film during packaging and improve the appearance of the meat product after the packaging.
[16] Further, nylon resin layers are formed doubly so that gas blocking performance may be improved and gas blocking time may be extended.
[17] In addition, waterproofness and strength are improved so that resistance against impact is improved, thereby preventing the film from being torn during the heat shrink packaging.
[18] Furthermore, the film may keep the superior resistance against impact and strength against tension by a finishing resin layer, so that the reliability and the quality of a meat product packaged by the film may be improved. Brief Description of the Drawings
[19] The objects, features and advantages of the present invention will be more clearly understood from the preferred embodiments in the following detailed description in conjunction with the accompanying drawings, in which:
[20] Fig. 1 is a cross-sectional view showing the structure of a section of a heat shrinkable film for low temperature sealing and gas blocking according to a preferred embodiment of the present invention; and
[21] Fig. 2 is a partially taken expanded cross-sectional view of Fig. 1.
Best Mode for Carrying Out the Invention
[22] Hereafter, an embodiment of a heat shrinkable film for low temperature sealing and gas blocking which carries out the present invention will be described with reference to the drawings.
[23] Fig. 1 is a cross-sectional view showing the structure of a section of a heat shrinkable film for low temperature sealing and gas blocking according to a preferred embodiment of the present invention, and Fig. 2 is a partially taken expanded cross- sectional view of Fig. 1.
[24] The heat shrinkable film for low temperature sealing and gas blocking according to a preferred embodiment of the present invention is formed in the multi-layered tube shape of a heat shrinkable material which becomes shrunk by slight heat.
[25] That is, a heat shrinkable film is made in a multi-layered structure as shown in Fig. 1, wherein two of such films each having a thin thickness are overlapped and both side ends thereof are extended in longitudinal direction so that meat products may be inserted and packed between the films after opening the films. The films may be cut by the length of the meat products inserted and packaged therebetween.
[26] According to the present invention, a low temperature sealing resin layer 10 is positioned at an innermost position of the heat shrinkable film for low temperature sealing and gas blocking, wherein the low temperature sealing resin layer 10 is stretched to be shrunk by slight heat for sealing an inside space.
[27] The low temperature sealing resin layer 10 is formed of EVA resin, which is easy for heat shrinking by slight heat, wherein the EVA resin is made by stretching in a drawing machine to shrink at shrink ratio for packaging a product by slight heat after being extruded by an extruder in an apparatus for making a heat shrinkable film (not shown).
[28] Further, the low temperature sealing resin layer 10 is formed in a cylindrical tube shape with thin thickness and overlapped flat to be in two layers by being folded at both sides by rollers.
[29] Fine powder which is not harmful to human is scattered evenly over the entire inner surfaces of the two overlapped layers of the low temperature sealing resin layer 10, so that the overlapped layers that are compressed by the rollers are prevented from sticking to each other.
[30] The low temperature sealing resin layer 10 is made of EVA resin to obtain a shrink ratio required for slight heat so that the low temperature sealing resin layer 10 prevents the deterioration of the meat product and prevents the freshness of the meat product in spite of the slight heat required for the shrink of the film during the packaging of the meat product.
[31] In the meantime, even though the low temperature sealing resin layer 10 has an advantage that the required shrink ratio can be obtained by the slight heat, the low temperature sealing resin layer 10 still has a problem that outside air may be introduced via a fine gap between the overlapped layers and deteriorate the freshness of the meat product in the case of long term keeping because gas permeability is high.
[32] In order to resolve this problem and any other disadvantages, a first nylon layer 20 is formed outside the low temperature sealing resin layer 10 via an adhesive layer 30 formed of adhesive, and a gas blocking resin layer 40 having superior gas blocking characteristics and a second nylon layer 50 having superior waterproofness are stacked on the outside of the first nylon layer 20 in sequence.
[33] Further, a finishing resin layer 70 is formed outside the second nylon layer 50 by using an adhesive layer 60.
[34] Since the gas blocking resin layer 40 cannot be adhered to the low temperature sealing resin layer 10 easily, the first nylon layer 20 is interposed between the gas blocking resin layer 40 and the low temperature sealing resin layer 10 by using the adhesive layer 30 so that the gas blocking resin layer 40 is completely adhered to the outside of the low temperature sealing resin layer 10 via the first nylon layer 20.
[35] The first nylon layer 20 serves to protect the gas blocking resin layer 40 and the low temperature sealing resin layer 10 from water because, the gas blocking resin layer 40 is apt to be permeated by water and the gas blocking performance thereof becomes deteriorated by the water, even though the gas blocking resin layer 40 is superior in the gas blocking performance.
[36] In other words, if the first nylon layer 20 is positioned between the low temperature sealing resin layer 10 and the gas blocking resin layer 40 that is formed outside the low temperature sealing resin layer 10 with superior gas blocking performance but weak water blocking performance, external air and humidity are prevented from permeating the low temperature sealing resin layer 10 even for the long term keeping after the packaging of the meat product, so that the external air and humidity cannot be introduced into the low temperature sealing resin layer 10. Therefore, the freshness of the packaged meat product may be maintained.
[37] In the meantime, the gas blocking resin layer 40 is made of any one substance selected from ethylene vinyl alcohol (EVOH) or poly vinylidene chloride (PVDC).
[38] Further, the first nylon layer 20 and the second nylon layer 50 are formed of nylon resin, which is superior in the waterproofness and improved in strength to have high gas blocking effect and high water blocking effect.
[39] The finishing resin layer 70 which is integrally adhered to the outside of the second nylon layer 50 by an adhesive layer 60 serves to protect the entire heat shrinkable film for low temperature sealing and gas blocking from deformation caused by impact and tension.
[40] As for the finishing resin layer 70, polypropylene (PP) is proper.
[41] The adhesive layers 30 and 60 may be formed of any resin adhesive substances which may join other resin films such as nylon or polypropylene integrally.
[42] It should further be apparent to those skilled in the art that various changes in form and detail of the invention as shown and described above may be made. It is intended that such changes be included within the spirit and scope of the claims appended hereto.

Claims

Claims
[1] A heat shrinkable film for low temperature sealing and gas blocking, comprising: a low temperature sealing resin layer positioned at an innermost position; a first nylon layer joined outside the low temperature sealing resin layer by an adhesive layer; a gas blocking resin layer formed outside the first nylon layer for blocking gas; a second nylon layer stacked outside the gas blocking resin layer; and a finishing resin layer stacked outside the second nylon layer by an adhesive layer.
[2] The heat shrinkable film for low temperature sealing and gas blocking as claimed in claim 1, wherein the gas blocking resin layer is made of poly vinylidene chloride(PVDC) or ethylene vinyl alcohol(EVOH) having gas blocking features, and the finishing resin layer is made of polypropylene (PP).
PCT/KR2008/003534 2007-10-25 2008-06-20 Heat shrinkable film for low temperature sealing and gas blocking WO2009054590A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR20070107866 2007-10-25
KR10-2007-0107866 2007-10-25
KR1020080030411A KR20090042130A (en) 2007-10-25 2008-04-01 Low temperature sealing heat constriction film having gas barrier disposition
KR10-2008-0030411 2008-04-01

Publications (1)

Publication Number Publication Date
WO2009054590A1 true WO2009054590A1 (en) 2009-04-30

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ID=40579676

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2008/003534 WO2009054590A1 (en) 2007-10-25 2008-06-20 Heat shrinkable film for low temperature sealing and gas blocking

Country Status (1)

Country Link
WO (1) WO2009054590A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5232767A (en) * 1989-06-28 1993-08-03 Kureha Kagaku Kogyo Kabushiki Kaisha Heat-shrinkable laminate film
US6106935A (en) * 1994-07-13 2000-08-22 Cryovac, Inc. Heat sealable film
US6365248B1 (en) * 1998-07-15 2002-04-02 Idemitsu Petrochemical Co., Ltd. Easily tearable laminated barrier film and bag product using the same
US6964816B2 (en) * 2002-09-09 2005-11-15 Curwood, Inc. Packaging films containing coextruded polyester and nylon layers

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5232767A (en) * 1989-06-28 1993-08-03 Kureha Kagaku Kogyo Kabushiki Kaisha Heat-shrinkable laminate film
US6106935A (en) * 1994-07-13 2000-08-22 Cryovac, Inc. Heat sealable film
US6365248B1 (en) * 1998-07-15 2002-04-02 Idemitsu Petrochemical Co., Ltd. Easily tearable laminated barrier film and bag product using the same
US6964816B2 (en) * 2002-09-09 2005-11-15 Curwood, Inc. Packaging films containing coextruded polyester and nylon layers

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