NZ745203B2 - Film for vsp packaging and easy opening packages obtained therefrom - Google Patents
Film for vsp packaging and easy opening packages obtained therefrom Download PDFInfo
- Publication number
- NZ745203B2 NZ745203B2 NZ745203A NZ74520317A NZ745203B2 NZ 745203 B2 NZ745203 B2 NZ 745203B2 NZ 745203 A NZ745203 A NZ 745203A NZ 74520317 A NZ74520317 A NZ 74520317A NZ 745203 B2 NZ745203 B2 NZ 745203B2
- Authority
- NZ
- New Zealand
- Prior art keywords
- film
- layer
- ethylene
- support
- iii
- Prior art date
Links
- 238000004806 packaging method and process Methods 0.000 title 1
- 239000000203 mixture Substances 0.000 claims abstract 20
- 229920000642 polymer Polymers 0.000 claims abstract 14
- 238000009460 vacuum skin packaging Methods 0.000 claims abstract 7
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims 12
- 239000005977 Ethylene Substances 0.000 claims 12
- -1 polybutylene Polymers 0.000 claims 12
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims 10
- 229920001748 polybutylene Polymers 0.000 claims 8
- 239000005038 ethylene vinyl acetate Substances 0.000 claims 7
- 229920000554 ionomer Polymers 0.000 claims 7
- 229920003145 methacrylic acid copolymer Polymers 0.000 claims 6
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims 5
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims 5
- 229920002126 Acrylic acid copolymer Polymers 0.000 claims 5
- 229920001577 copolymer Polymers 0.000 claims 5
- 229940117841 methacrylic acid copolymer Drugs 0.000 claims 5
- 230000004888 barrier function Effects 0.000 claims 4
- 229920001169 thermoplastic Polymers 0.000 claims 4
- 239000004416 thermosoftening plastic Substances 0.000 claims 4
- 239000004952 Polyamide Substances 0.000 claims 3
- 230000000295 complement effect Effects 0.000 claims 3
- 229920001903 high density polyethylene Polymers 0.000 claims 3
- 239000004700 high-density polyethylene Substances 0.000 claims 3
- 229920001519 homopolymer Polymers 0.000 claims 3
- 229920002647 polyamide Polymers 0.000 claims 3
- 238000010998 test method Methods 0.000 claims 3
- 229920000219 Ethylene vinyl alcohol Polymers 0.000 claims 2
- 239000004698 Polyethylene Substances 0.000 claims 2
- 238000004132 cross linking Methods 0.000 claims 2
- UFRKOOWSQGXVKV-UHFFFAOYSA-N ethene;ethenol Chemical compound C=C.OC=C UFRKOOWSQGXVKV-UHFFFAOYSA-N 0.000 claims 2
- 239000004715 ethylene vinyl alcohol Substances 0.000 claims 2
- 238000004519 manufacturing process Methods 0.000 claims 2
- 238000000034 method Methods 0.000 claims 2
- 229920000728 polyester Polymers 0.000 claims 2
- 229920000573 polyethylene Polymers 0.000 claims 2
- 229920000915 polyvinyl chloride Polymers 0.000 claims 2
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 claims 1
- BLDFSDCBQJUWFG-UHFFFAOYSA-N 2-(methylamino)-1,2-diphenylethanol Chemical compound C=1C=CC=CC=1C(NC)C(O)C1=CC=CC=C1 BLDFSDCBQJUWFG-UHFFFAOYSA-N 0.000 claims 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims 1
- 229920000089 Cyclic olefin copolymer Polymers 0.000 claims 1
- 239000004716 Ethylene/acrylic acid copolymer Substances 0.000 claims 1
- 239000004743 Polypropylene Substances 0.000 claims 1
- 239000004793 Polystyrene Substances 0.000 claims 1
- 229920001328 Polyvinylidene chloride Polymers 0.000 claims 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 claims 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims 1
- 229910052782 aluminium Inorganic materials 0.000 claims 1
- IAQRGUVFOMOMEM-UHFFFAOYSA-N butene Natural products CC=CC IAQRGUVFOMOMEM-UHFFFAOYSA-N 0.000 claims 1
- 229910002091 carbon monoxide Inorganic materials 0.000 claims 1
- 239000011111 cardboard Substances 0.000 claims 1
- 229920006242 ethylene acrylic acid copolymer Polymers 0.000 claims 1
- 235000013305 food Nutrition 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 claims 1
- 229920001684 low density polyethylene Polymers 0.000 claims 1
- 239000004702 low-density polyethylene Substances 0.000 claims 1
- 239000000463 material Substances 0.000 claims 1
- 229920001179 medium density polyethylene Polymers 0.000 claims 1
- 239000004701 medium-density polyethylene Substances 0.000 claims 1
- 238000000465 moulding Methods 0.000 claims 1
- 229920001155 polypropylene Polymers 0.000 claims 1
- 229920002223 polystyrene Polymers 0.000 claims 1
- 239000005033 polyvinylidene chloride Substances 0.000 claims 1
- 238000007789 sealing Methods 0.000 claims 1
- 229920001897 terpolymer Polymers 0.000 claims 1
- 229920001866 very low density polyethylene Polymers 0.000 claims 1
- 239000011701 zinc Substances 0.000 claims 1
- 229910052725 zinc Inorganic materials 0.000 claims 1
- 239000004711 α-olefin Substances 0.000 claims 1
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
-
- 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
- B32B2270/00—Resin or rubber layer containing a blend of at least two different 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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
- B32B2307/31—Heat sealable
-
- 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
- B32B2307/50—Properties of the layers or laminate having particular mechanical 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
- B32B2439/70—Food packaging
-
- 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
- B32B27/06—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
- B32B27/10—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 paper or cardboard
-
- 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
- B32B27/302—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising aromatic vinyl (co)polymers, e.g. styrenic (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
- B32B27/30—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
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/308—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (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
- 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
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
-
- 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
- B32B7/06—Interconnection of layers permitting easy separation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B31/00—Packaging articles or materials under special atmospheric or gaseous conditions; Adding propellants to aerosol containers
- B65B31/02—Filling, closing, or filling and closing, containers or wrappers in chambers maintained under vacuum or superatmospheric pressure or containing a special atmosphere, e.g. of inert gas
- B65B31/024—Filling, closing, or filling and closing, containers or wrappers in chambers maintained under vacuum or superatmospheric pressure or containing a special atmosphere, e.g. of inert gas specially adapted for wrappers or bags
-
- 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
- B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes or webs of flexible sheet material, e.g. in folded wrappers
- B65D75/26—Articles or materials wholly enclosed in laminated sheets or wrapper blanks
-
- 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
- B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes or webs of flexible sheet material, e.g. in folded wrappers
- B65D75/28—Articles or materials wholly enclosed in composite wrappers, i.e. wrappers formed by associating or interconnecting two or more sheets or blanks
- B65D75/30—Articles or materials enclosed between two opposed sheets or blanks having their margins united, e.g. by pressure-sensitive adhesive, crimping, heat-sealing, or welding
- B65D75/305—Skin packages
-
- 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
- B65D81/34—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 for packaging foodstuffs or other articles intended to be cooked or heated within the package
-
- 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
- B65D81/34—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 for packaging foodstuffs or other articles intended to be cooked or heated within the package
- B65D81/3446—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 for packaging foodstuffs or other articles intended to be cooked or heated within the package specially adapted to be heated by microwaves
- B65D81/3461—Flexible containers, e.g. bags, pouches, envelopes
Abstract
The present invention relates to cross-linked vacuum skin packaging (VSP) films used as top webs for VSP packages endowed with easy opening features and to VSP packages obtained therefrom. The films of the invention comprise at least one layer of a frangible blend of incompatible polymers. The easy-to-open VSP packages obtained therefrom may advantageously include very simple and cheap supports.
Claims (27)
1. A cross-linked thermoplastic multilayer film for use as a top web in VSP applications comprising at least 5 an outer heat sealable layer (a), a layer (b) directly adhered to the layer (a) or adhered to the layer (a) with the interposition of a layer (a’) and, an optional thermoplastic layer (c) adjacent and directly bonded to layer (b), wherein the layer (a) and/or the layer (a’) if present and/or the layer (b) comprise a cross-linked easy 10 opening frangible blend (B) of at least two chemically or physically incompatible polymers- wherein said easy opening frangible blend (B) comprises or consists of: (i) an ethylene and acrylic acid or methacrylic acid copolymer and (ii) a modified EVA copolymer, or (i) an ethylene and acrylic acid or methacrylic acid copolymer and (iii) a polybutylene, or (ii) an ethylene homo or copolymer or an EVA copolymer and (iii) a polybutylene 15 wherein said cross-linked thermoplastic multilayer film for use as a top web in VSP applications has: - a total thickness of from 50 to 180 microns; and - an implosion resistance of at least 8 mm; and either i) a gel content of the whole film, in case all the polymers making the film are toluene-soluble before 20 cross-linking, or of at least the part of it made of polymers which before cross-linking are toluene- soluble, of not less than 60% by weight with respect to the whole film weight or to said part of film weight, respectively, measured in accordance with the test method reported in the present description; ii) a MFI of the whole film, measured at 230°C, 2.16 kg, according to ASTM D-1238, not higher than 2 25 g/10 min.
2. The film of claim 1 in which the easy opening frangible blend (B) further comprises a third polymer, thus providing a ternary blend, said ternary blend comprising a polymer (i), a polymer (ii) and a polymer (iii).
3. The film of claims 1 or 2 wherein the easy opening frangible blend (B) comprises: 30 (i) an ethylene and acrylic acid or methacrylic acid copolymer, (ii) a modified EVA copolymer and, optionally, (iii) a polybutylene; or (i) an ionomer and (iii) a polybutylene; or (ii) an EVA and (iii) a polybutylene; or (ii) an ethylene homo- or copolymer and (iii) a polybutylene.
4. The film of any one of the preceding claims wherein the easy opening frangible blend (B) comprises, or consists of, (i) an ionomer, (ii) a terpolymer of ethylene, vinyl acetate and carbon monoxide, and 5 (iii) an ethylene- butene copolymer or a butene homopolymer.
5. The film of any one of the preceding claims wherein polymer (i), if present, is a zinc ionomer.
6. The film of any one of the preceding claims wherein the easy opening frangible blend (B) is a ternary blend, which comprises or consists of: from 35% to 83 %, or from 50% to 70% by weight of polymer (i), 10 from 15% to 30% or from 18% to 25% by weight of polymer (ii), and from 2% to 50%, or from 5% to 40% by weight of polymer (iii).
7. The film of claim 1 wherein the frangible blend (B) consists of: (i) more than 50% of an ethylene and acrylic acid or methacrylic acid copolymer and (ii) the complement to 100% of a modified EVA copolymer, or 15 (i) more than 50% of an ethylene and acrylic acid or methacrylic acid copolymer and (iii) the complement to 100% of a polybutylene, or (ii) more than 50% of an ethylene homo or copolymer or an EVA copolymer and (iii) the complement to 100% of a polybutylene.
8. The film according to any one of the preceding claims wherein layer (a’) is absent. 20
9. The film of any one of the preceding claims wherein only layer (b) comprises the easy opening frangible blend (B).
10. The film of claim 9 wherein layer (b) comprises at least 50%, 60%, 70%, 80%, 90% of the frangible blend (B), or consists of the frangible blend (B).
11. The film according to any one of the preceding claims wherein layer c) is present and comprises 25 (d) an outer abuse layer and/or (e) an inner barrier layer and/or (f) a bulk layer and, optionally, (g) one or more inner tie layers.
12. The film according to claim 11 in which said layer c) comprises two bulk layers f) and an inner gas 30 barrier layer e), wherein the two bulk layers f) are positioned on the opposite sides with respect to the inner gas barrier layer e).
13. The film of any one of the preceding claims wherein - the outer heat sealable layer (a) comprises at least 50%, 60%, 70%, 80%, 90% or, consists of, a sealable material selected from ethylene homo- or co-polymers, ethylene/alpha-olefin copolymers, polypropylene, ethylene/acrylic acid copolymers, ethylene/methacrylic acid copolymers, ionomers, ethylene-vinyl acetate copolymers (EVA) and blends thereof and/or - said outer abuse layer (d), if present, comprises at least 50%, 60%, 70%, 80%, 90%, or, consists of, a polymer selected from ionomers, MDPE, HDPE and their blends, preferably HDPE, and/or 5 - said barrier layer (e), if present, comprises at least 50%, 60%, 70%, 80%, 90%, or consists of a polymer selected from PVDC, polyamides, EVOH, polyesters, and blends thereof, preferably EVOH, optionally blended with polyamides, and/or - said bulk layer (f), if present, comprises at least 50%, 60%, 70%, 80%, 90% or consists of a polymer selected from low density polyethylene, ethylene-vinyl acetate copolymers, linear low density 10 polyethylenes, linear very low density polyethylenes, ionomers and their blends, preferably from ionomers, ethylene-vinyl acetate copolymers and their blends.
14. The film of any one of the preceding claims wherein the thickness of the layer (a) is from 1 to 10 microns, from 1 to 5 microns, or from 1 to 3 microns and/or - the thickness of layer (a’), if present, is from 1 to 10 microns, from 1 to 5 microns, or from 1 to 3 15 microns and/or - the thickness of the layer (b) is from 2 to 30 microns, from 4 to 20 microns, or from 4 to 10 microns.
15. The film of any one of the preceding claims further wherein the film has - an implosion resistance at least 10 mm, at least 11 mm, at least 12 mm, or at least 13 mm measured according to the implosion resistance test method reported in the present description; and/or 20 - a MFI of the whole film, measured at 230°C, 21.6 kg, according to ASTM D-1238, not higher than 3 g/10 min, not higher than 2 g/10 min, not higher than 1 g/10 min, or of about 0 g/10 min, and/or - a MFI of the whole film, measured at 230°C, 2.16 kg, according to ASTM D-1238, not higher than 1 g/10 min, or of about 0 g/10 min, and/or - a formability score for both webbing and bridging (longitudinal and transverse) of at least 2.0, at least 25 2.5, or at least 2.8, measured according to the formability test method reported in the present description.
16. An easy-to-open VSP package comprising: - a cross-linked top film according to any one of claims 1 to 15, · a support and 30 - a product loaded onto said support said film being draped over the product and sealed to the entire surface of the support not covered by the product.
17. The package of claim 16 in which said support comprises a mono or multilayer web, wherein the web does not comprise the easy opening frangible blend (B) as defined in any one of claims 1 to7.
18. The package of claims 16 or 17 in which said support is a multilayer support comprising a seal layer and at least a bulk layer, said bulk layer comprising polyethylene, HDPE, polystyrene, polyester, poly(vinyl chloride (PVC), polypropylene, polyamides, cardboard or aluminum.
19. The package of any one of claims 16 to 18, wherein the support has at least one hole. 5
20. The package of any one of claims 16 to 19, wherein the product is a food product.
21. The package of any one of claims 16 to 20, which is suitable for microwave cook-in applications.
22. A vacuum skin packaging process for manufacturing an easy-to-open VSP package comprising -providing a cross-linked top film according to any one of claims 1 to 15, comprising a heat sealable outer layer (a) 10 - providing a support, - disposing the film over the support, with the outer layer (a) facing the support, - disposing a product between the top film and the support, - heating the top film and moulding it down upon and around the product and against the support, the space between the heated top film and the support having been evacuated to form a tight skin around 15 the product, and - tight sealing said top film to the entire surface of the support not covered by the product by differential air pressure.
23. Use of a film according to any one of claims 1 to 15 as top web in easy-to-open VSP packages.
24.A cross-linked thermoplastic multilayer film for use as a top web in VSP applications according to 20 claim 1 substantially as herein described according to any example thereof.
25. An easy-to-open VSP package according to claim 16 substantially as herein described with reference to any example thereof.
26. A vacuum skin packaging process for manufacturing an easy-to-open VSP package according to 25 claim 22 substantially as herein described with reference to any example thereof.
27. A use according to claim 23 substantially as herein described with reference to any example thereof.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP16158986 | 2016-03-07 | ||
| PCT/EP2017/055365 WO2017153434A1 (en) | 2016-03-07 | 2017-03-07 | Easy opening film for vacuum skin packaging |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| NZ745203A NZ745203A (en) | 2024-11-29 |
| NZ745203B2 true NZ745203B2 (en) | 2025-03-04 |
Family
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