GB2143173A - Aluminium-based laminate and packaging bag for foodstuffs to be pasteurised - Google Patents

Aluminium-based laminate and packaging bag for foodstuffs to be pasteurised Download PDF

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Publication number
GB2143173A
GB2143173A GB08332127A GB8332127A GB2143173A GB 2143173 A GB2143173 A GB 2143173A GB 08332127 A GB08332127 A GB 08332127A GB 8332127 A GB8332127 A GB 8332127A GB 2143173 A GB2143173 A GB 2143173A
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GB
United Kingdom
Prior art keywords
layer
bag
film according
ethylene
ionomer
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
GB08332127A
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GB8332127D0 (en
GB2143173B (en
Inventor
Giuliano Forbicini
Carlo Masi Sortori
Mario Paleari
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
WR Grace and Co
Original Assignee
WR Grace and Co
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 GB8020536A external-priority patent/GB2078168B/en
Application filed by WR Grace and Co filed Critical WR Grace and Co
Priority to GB08332127A priority Critical patent/GB2143173B/en
Publication of GB8332127D0 publication Critical patent/GB8332127D0/en
Publication of GB2143173A publication Critical patent/GB2143173A/en
Application granted granted Critical
Publication of GB2143173B publication Critical patent/GB2143173B/en
Expired legal-status Critical Current

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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
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal 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
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L3/00—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs
    • A23L3/10—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by heating materials in packages which are not progressively transported through the apparatus
    • 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
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
    • 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
    • B32B2439/00—Containers; Receptacles
    • B32B2439/40—Closed containers
    • B32B2439/46—Bags
    • 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
    • B32B2439/70—Food packaging

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  • Health & Medical Sciences (AREA)
  • Nutrition Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Polymers & Plastics (AREA)
  • Laminated Bodies (AREA)

Abstract

An aluminium-based laminate includes (a) a substrate layer, (b) a primer layer, (c) a bonding layer of polyethylene attached to the substrate layer with the assistance of the primer layer, (d) an aluminum foil layer secured to the bonding layer, (e) a substantially solvent-free adhesive layer of ionomer or ethylene-vinylacetate copolymer applied to the aluminium foil layer. and (f) a sealing layer of ethylene and/or propylene polymer maintained on the aluminium foil layer by means of the substantially solvent-free adhesive layer. The ionomer is a copolymer of an alpha -mono-olefin, an unsaturated organic acid, and a metal salt of the unsaturated organic acid. A packaging bag made of such a laminate is able to withstand pasteurisation without any tendency to delaminate.

Description

SPECIFICATION Aluminium-based laminate and packaging bag thereof for foodstuffs to be pasteurised This invention relates to a laminate containing an aluminium foil layer and polymeric layers and to a bag formed thereof for the packaging of foodstuffs to be pasteurised.
Laminate films for packaging foodstuffs containing an aluminium foil layer and polymeric layers are known. The aluminium foil layer acts as a barrier to the passage of oxygen and watervapour through the packaging film. It is used particularly when the food is to be packaged in a sealed bag of the film and then heated in a steam oven or in water, especially for pasteurisation purposes. The laminate film contains polymeric layers which protect the aluminium foil layer from physical damage and strengthen the whole film. Also, one or both polymeric layers forming the surfaces of the film are used as a sealing layer. That is, when the film is made up into a bag, the surface layers facing each other are joined together, e.g. by heat-sealing, to form longitudinal and/or transverse bonds and thereby close the bag.
In laminate films of the above kind the aluminium foil has to be glued to the flanking polymeric layers with an adhesive. Of course, the bond strength of the adhesion has to be high, to withstand the handling of the packages. Also the bond has to withstand the pasteurisation temperature which is often as high as 11 5 C. We aim to provide a bond strength of at least 500 grams per inch (200 grams per cm.) before and after pasteurisation. All bond strengths referred to herein are determined on an "instron" (Registered Trade Mark in the U.K. and many other countries) dynamometer at 23"C and a cross-head speed of 300 mm./minute.
To prepare laminate films of the above kind, we have in the past used the following process.
A substrate film of polyester is corona-treated to make it more receptive to the glue layer to be applied next. The corona-treated polyester passes to a glue station where a glue of polyurethane resin is applied. The glue is a mixture of 100 parts of polyurethane resin, i.e. prepolymer, 2.5 parts of a curing catalyst and 50 parts of ethyl acetate as solvent. All parts and percentages throughout this specification are by weight. The glue-coated substrate is passed to a series of ovens in which the solvent is evaporated. The substrate is then passed over a hot roll and its glued surface is brought into contact with the aluminium foil. The layers are pressed together with a rubber roll.Then the aluminium foil layer of this polyester/polyurethane/aluminium foil laminate is coated with the same glue, the laminate is again passed into a series of ovens and the solvent of the glue is evaporated. The polyester/polyurethane/aluminium foil/polyurethane laminate is passed over a hot roll and its glued surface is contacted with a film of corona-treated medium density polyethylene. This is pressed onto the laminate with a rubber roll. The product is a slayer laminate of polyester/polyurethane/aluminium foil/polyurethane/medium density polyethylene. The polyethylene layer is the sealing layer so when the above laminate is formed into bags the polyethylene layer is innermost and the polyester layer is outermost.
The above laminate has a bond strength which is normally adequate. A typical value is 700 grams per inch (280 grams per cm.). However we have encountered the problem that 3 to 4%, a significant proportion, of bags made from these laminates have had to be rejected. This is on account of delamination and the opening of seals. Moreover the process of making the laminate is rather lengthy, because of the time needed to evaporate the solvent from the glue.
We have now invented a different process for making laminate film. Tests on a film laminate made by the process of the present invention have shown a bond strength of at least 700 grams per inch (280 grams per cm) before pasteurisation. Surprisingly the bond strength increases as a result of pasteurisation to at least 800 grams per inch (320 grams per cm.) after pasteurisation. Moreover, the laminate can be prepared more easily, only one pass through an oven to evaporate solvent being required instead of two passes in the process referred to above.
The invention is based on the principle that the aluminium foil is bonded to a layer of a polymer of ethylene and/or propylene, as sealing layer, by a layer of an ionomer or an ethyleneacrylic acid copolymer, or an ethylene-vinyl acetate copolymer, which is substantially free of solvent. In this way, the use of solvent-based glue can be avoided in the bonding of the sealing layer to the aluminium foil. The aluminium foil layer can be backed by any polymeric layer(s) appropriate to the use of the laminate film for packaging purposes.
According to an aspect of the present invention there is provided a laminate film comprising the following layers in the order stated: (a) a substrate layer of a polymeric material; (b) a primer layer; (c) a bonding layer of polyethylene having a density in the range of 0.89 to 0.935 g/cc; (d) an aluminium foil layer; (e) a substantially solvent-free adhesive layer of (i) an ionomer, or (ii) an ethylene-vinyl acetate copolymer containing from 5 to 40% vinyl acetate units; and (f) a sealing layer of an ethylene and/or propylene polymer.
A second aspect of the invention provides a laminated bag for packaging foodstuffs, formed from a laminate film comprising the following layers in the order stated: (a) a substrate layer of a polymeric material; (b) a primer layer; (c) a bonding layer of polyethylene having a density in the range of 0.89 to 0.935 g/cc; (d) an aluminium foil layer; (e) a substantially solvent-free adhesive layer of (i) an monomer, or (ii) an ethylene-vinyl acetate copolymer containing from 5 to 40% vinyl acetate units; and (f) a sealing layer of an ethylene and/or propylene polymer; wherein the sealing layer is on the inside of the bag.
A preferred form of the laminate film may be one comprising the following layers in the order stated: 1. A first layer of a polymeric material, preferably a polyester, metallized polyester, bioriented nylon, metallized bioriented nylon, bioriented polypropylene or metallized bioriented polypropylene layer. This is called the "substrate layer 2. A layer of a primer, which can be a solvent-based glue, e.g. a polyurethane glue.
3. A layer of a low or medium density polyethylene. It is substantially free of solvent. It can be applied by melt-extrusion. This is called the "bonding layer".
4. An aluminium foil layer.
5. A layer of (a) an ionomer, (b) an ethylene-acrylic acid copolymer containing from 2 to 10% of acrylic acid units or (c) an ethylene-vinyl acetate copolymer containing from 5 to 40% vinyl acetate units, this layer being substantially free of solvent. It can be applied by melt-extrusion.
This is called the "solvent-free adhesive layer".
6. A layer of an ethylene and/or propylene polymer, preferably a medium or high density polyethylene, polypropylene, an ethylene-propylene copolymer containing from 3 to 20% of ethylene units, or a mixture of polyethylene with polypropylene in which the proportion of polyethylene is from 3 to 20%. The preferred material is medium density polyethylene. This is called the "sealing layer".
The "ionomer" is a copolymer comprising units of an alpha-mono-olefin, preferably ethylene, an unsaturated organic acid, preferably an a,fl-unsaturated carboxylic acid such as methacrylic or acrylic acid, and a salt of such an acid, preferably an alkali metal, e.g. sodium, salt or a zinc salt. It is ordinarily obtained by partial neutralisation of a bipolymer of the alpha-mono-olefin and unsaturated organic acid components. The proportions of the three components of an ionomer are, for example, 80 to 95% alpha-mono-olefin, 2 to 10% unsaturated acid and 0.5 to 10% metal salt of the unsaturated acid. Usually the proportion of the salt component will not exceed 5%.One ionomer which we have found particularly useful is "Surlyn 1652". ("Surlyn" is a Registered Trade Mark of E l. du Pont de Nemours 8 Co. in the U.K. and many other countries).
The preferred thicknesses of the layers are as follows: 1. Substrate layer 10 to 30 microns 2. Primer layer 3. Boding layer 8 to 50 microns 4. Aluminium foil layer 8 to 20 microns 5. Solvent-free adhesive layt 10 to 50 microns 6. Sealing layer 20 to 100 microns The preferred laminate made by the process of the present invention is a 6-layer laminate of the following sequence:polyester/primer/low density polyethylene/aluminium foil/ionomer/medium density polyethylene.
Normally the substrate will require a surface treatment, especially application of a primer to bond it to the bonding layers. Suitable primers are known for this purpose. A polyurethane glue containing ethyl acetate solvent is usable. When the substrate layer is of a polyester, it will usually require surface treatment before the primer is applied. This can be carried out by corona treatment in a known manner. Thus the process will usually contain the preliminary steps of corona treatment of a polyester, followed by appiication of a layer of solvent-based primer and evaporation of the solvent of the primer in an oven or series of ovens before the substrate is ready to receive the bonding layer. Only one p3SS in an oven is required in this procedure, which more than compensates for the use of a 'I:7n;ling layer in addition to the substrate.
A second aspect of the present invention includes 'so bags made from the laminate of the second aspect of the present invention, with the sealing layer innermost.
The invention further provides a package of a foodstuff sealed within such a bag. The invention further provides a process of pasteurising a foodstuff which comprises heating it in a bag according to the second aspect, at a temperature of from 70 to 1 5çC for a time sufficient to effect pasteurisation. (The pasteurisation time will ordinarily be from 20 minutes to 2 hours depending on the temperature). Preferably the heating is carried out in a fluid aqueous medium, e.g. steam in a steam oven or hot water.
It is contemplated that the invention will be particularly useful in the pasteurising of foodstuffs (including beverages), especially processed meat, e.g. hams and bacon joints.
The following Example illustrates the invention.
EXAMPLE A laminate was made by the following method. A film of polyester (polyethylene terephthalate) was corona treated and primed with a polyurethane glue, and the solvent of the glue was evaporated in an oven. Low density polyethylene was melt-extruded at a melt temperature of 320-330"C between the polyester layer and an aluminium foil to form the intermediate bonding layer.The resulting 4-layer laminate and a film of medium density polyethylene were brought into proximity and a layer of the ionomer "Surlyn 1652" was applied between them by melt extrusion at a melt temperature of 310 to 320"C. In this way a laminate of the following structure was prepared: Lovers Thickness in microns Polyethylene terephthalte 1?.5 Primer 0.7 Low density polbethlerj 16.0 Aluminium foil 9.0 "Surlyn 1652" icnomer Medium density polyethylene 75.0 The bond strength of the laminate was found to be at least 700 grams per inch (280 grams per cm.). The laminate was made up into a bag and subjected to pasteurisation conditions in a steam oven at 1 5 C for 20 minutes. After pasteurisation the bond strength of the laminate had increased to at least 800 grams per inch (320 grams per cm.). The terms "low density" and "medium density" when used herein in relation to polyethylenes refer mainly to densities of 0.89 to 0.925 and 0.926 to 0.935 g/cc respectively.

Claims (9)

1. A laminate film comprising the following layers in the order stated: (a) a substrate layer of a polymeric material; (b) a primer layer; (c) a bonding layer of polyethylene having a density in the range of 0.89 to 0.935 g/cc; (d) an aluminium foil layer; (e) a substantially solvent-free adhesive layer of (i) an ionomer, or (ii) an ethylene-vinyl acetate copolymer containing from 5 to 40% vinyl acetate units; and (f) a sealing layer of an ethylene and/or propylene polymer.
2. A laminated bag for packaging foodstuffs, formed from a laminate film comprising the following layers in the order stated: (a) a substrate layer of a polymeric material; (b) a primer layer; (c) a bonding layer of polyethylene having a density in the range of 0.89 to 0.935 g/cc; (d) an aluminium foil layer; (e) a substantially solvent-free adhesive layer of (i) an ionomer, or (ii) an ethylene-vinyl acetate copolymer containing from 5 to 40% vinyl acetate units; and (f) a sealing layer of an ethylene and/or propylene polymer; wherein the sealing layer is on the inside of the bag.
3. A bag or film according to claim 1 or 2, wherein said substrate layer is formed of a polyester, a metallised polyester, bi-oriented Nylon, metallised bi-oriented Nylon, bi-oriented polypropylene, or metallised bi-oriented polypropylene.
4. A bag or film according to claim 1, 2 or 3, wherein said sealing layer is formed of polyethylene having a density of at least 0.926 g/cc, polypropylene, an ethylene-propylene copolymer containing from 3 to 20% of ethylene units, or a mixture of polyethylene with polypropylene in which the proportion of polyethylene is from 3 to 20%.
5. A bag or film according to claim 4, wherein said sealing layer is formed of polyethylene having a density of from 0.926 to 0.935 g/cc.
6. A bag or film according to any one of the preceding claims, wherein said primer layer is of a solvent-based glue.
7. A bag or film according to claim 6, wherein said solvent-based glue is a polyurethane glue.
8. A bag or film according to any one of the preceding claims, wherein said substantially solvent-free adhesive layer is formed of an ionomer comprising units of ethylene, an a-ss- unsaturated carboxylic acid, and an alkali metal salt of said unsaturated acid.
8. A bag or film according to any one of the preceding claims, wherein said substantially solvent-free adhesive layer is formed of an ionomer comprising units of an a-mono-olefin, an unsaturated organic acid, and a salt of such unsaturated acid.
9. A bag or film according to claim 8, wherein said ionomer is obtained by partial neutralisation of a bipolymer of the a-mono-olefin and unsaturated organic acid components.
10. A bag or film according to claim 8 or 9, wherein the a-mono-olefin is ethylene, the acid is methacrylic acid or acrylic acid, and the salt is the salt of an alkali metal.
11. A bag or film according to claim 10, wherein the salt is a salt of sodium or zinc.
1 2. A bag or film according to any one of claims 8 to 11, wherein said ionomer comprises from 80 to 95% of a-mono-olefin, from 2 to 10% of unsaturated acid, and from 0.5 to 10% of the salt of the unsaturated acid.
13. A bag or film according to claim 12, wherein the proportion of the salt is from 0.5 to 5%.
14. A bag or film according to any one of the preceding claims, wherein said substantially solvent-free adhesive layer has been applied to the substrate layer by melt-extrusion.
1 5. A bag or film according to any one of the preceding claims, wherein the substrate layer has a thickness of from 10 to 30 microns, the bonding layer has a thickness of from 8 to 50 microns, the aluminium foil layer has a thickness of from 8 to 20 microns, the substantially solvent-free adhesive layer has a thickness of from 10 to 50 microns, and the sealing layer has a thickness of from 20 to 100 microns.
1 6. A bag or film according to any one of claims 1 to 14, wherein the substrate layer is of polyester, the bonding layer is of polyethylene having a density in the range from 0.89 to 0.925 g/cc, and the substantially solvent-free adhesive layer is of an ionomer.
1 7. A bag or film according to claim 1 and substantially as hereinbefore described.
1 8. A bag according to any one of claims 2 to 17, which has been pasteurised by heating at a temperature of from 70"C to 11 5 C for a time sufficient to effect pasteurisation.
1
9. A bag according to claim 18, wherein said pasteurising heating has been carried out in a fluid aqueous medium.
20. A bag according to either claim 18 or claim 19, including pasteurised foodstuffs.
21. A laminated bag according to claim 2, and substantially as hereinbefore described.
22. A laminate film according to claim 1, and substantially as hereinbefore described.
23. A process of pasteurising a foodstuff, which comprises placing it in a bag according to any one of claims 2 to 21, sealing the bag, and heating the bag and the enclosed foodstuff to a temperature of from 70"C to 11 5 C and maintaining it at that temperature for a time sufficient to effect pasteurisation of the foodstuff in the bag.
1. A laminate film comprising the following layers in the order stated: (a) a substrate layer of a polymeric material; (b) a primer layer; (c) a bonding layer of polyethylene having a density in the range of 0.89 to 0.935 g/cc; (d) an aluminium foil layer; (e) a substantially solvent-free adhesive layer of (i) an ionomer comprising units of an a-mono-olefin, an unsaturated organic acid and a salt of such an acid, or (ii) an ethylene-vinyl acetate copolymer containing from 5 to 40% vinyl acetate units; and (f) a sealing layer of an ethylene and/or propylene polymer.
2. A laminated bag for packaging foodstuffs, formed from a laminate film comprising the following layers in the order stated: (a) a substrate layer of a polymeric material; (b) a primer layer; (c) a bonding layer of polyethylene having a density in the range of 0.89 to 0.935 g/cc; (d) an aluminium foil layer; (e) a substantially solvent-free adhesive layer of (i) an ionomer comprising units of an a-mono-olefin, an unsaturated organic acid, and a salt of such an acid, or (ii) an ethylene-vinyl acetate copolymer containing from 5 to 40% vinyl acetate units; and (f) a sealing layer of an ethylene and/or propylene polymer; wherein the sealing layer is on the inside of the bag.
GB08332127A 1980-06-23 1983-12-01 Aluminium-based laminate and packaging bag for foodstuffs to be pasteurised Expired GB2143173B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08332127A GB2143173B (en) 1980-06-23 1983-12-01 Aluminium-based laminate and packaging bag for foodstuffs to be pasteurised

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8020536A GB2078168B (en) 1980-06-23 1980-06-23 Aluminium-based laminate for packaging of foodstuffs to be pasteurised
GB08332127A GB2143173B (en) 1980-06-23 1983-12-01 Aluminium-based laminate and packaging bag for foodstuffs to be pasteurised

Publications (3)

Publication Number Publication Date
GB8332127D0 GB8332127D0 (en) 1984-01-11
GB2143173A true GB2143173A (en) 1985-02-06
GB2143173B GB2143173B (en) 1985-09-11

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2201372A (en) * 1987-02-19 1988-09-01 Smiths Industries Plc Laminates for ostomy bags
EP1203655A1 (en) * 2000-11-06 2002-05-08 Sonoco Development, Inc. Retortable pouch
EP1502731A1 (en) * 2003-07-28 2005-02-02 Guy Breger Composite packaging film and its preparation

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115384160B (en) * 2022-09-23 2024-02-06 湖南怡永丰新材料科技有限公司 Cover film for powder-liquid double-chamber bag and preparation method and application thereof

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2201372A (en) * 1987-02-19 1988-09-01 Smiths Industries Plc Laminates for ostomy bags
GB2201372B (en) * 1987-02-19 1991-03-13 Smiths Industries Plc Ostomy bags and materials.
US5009647A (en) * 1987-02-19 1991-04-23 Smiths Industries Public Limited Company Water closet disposable ostomy bags and materials
EP1203655A1 (en) * 2000-11-06 2002-05-08 Sonoco Development, Inc. Retortable pouch
EP1502731A1 (en) * 2003-07-28 2005-02-02 Guy Breger Composite packaging film and its preparation
WO2005014276A1 (en) * 2003-07-28 2005-02-17 Gaj Developpement Sas Composite packaging film and method for the production thereof

Also Published As

Publication number Publication date
GB8332127D0 (en) 1984-01-11
GB2143173B (en) 1985-09-11

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