Multi-layer metallized paper-based packaging material
AssigneeSociete des Produits Nestle S.A.
InventorsAlexey Vishtal, Abhijit Bhattacharya
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Abstract
The present invention relates generally to the field of multi-layer packaging material. In particular, the present invention relates to a multi-layer metallized paper-based packaging material comprising a paper layer, a pre metallization coating layer, a metallized layer, and at least one post metallization coating layer. The present invention further relates to the use of the multi-layer metallized paper-based packaging material in accordance with the present invention to package food and to a food package manufactured from the multi-layer metallized paper-based packaging material. In one embodiment of the present invention the multi-layer metallized paper-based packaging material can be recycled with other paper packaging materials.
Claims11
A multi-layer metallized paper-based packaging material comprising, from its outer side to its inner side:
- a paper layer having a grammage comprised in the range of 40 to 120 g/m2, and wherein the paper layer has a back side Bekk smoothness in the range of about 300-1000 seconds,
- at least one pre-metallization dispersion coating layer in an amount of about 1-10 g/m2 and comprising an ethylene acrylic acid copolymer,
- a vacuum deposited metallization layer comprising an aluminium layer having a thickness in the range of 20-500 nm with an optical density of about 1-4, and
- at least one post-metallization dispersion coating layer in an amount in the range of about 0.5-10 g/m2,
- wherein the at least one post-metallization dispersion coating layer comprises:
- a post-metallization tie layer coating comprising an ethylene acrylic acid (EAA) copolymer dispersion functionalized with a methacrylic acid;
- and
- a copolymer layer comprising a plain or mineral filled ethylvinylalcohol (EVOH), butylvinyl alcohol (BVOH) or polyvinylalcohol (PVOH) copolymer layer applied on top of the post-metallization tie layer coating, wherein the multi-layer metallized paper-based packaging material has a WVTR barrier of below 1 g/m2·d (23° C., 85% RH) and/or an OTR barrier below about 3 cm3/m2·d·bar (23° C., 50% RH) after folding the material to 180° under 2 kilograms of compressive load in such a manner that the inner side of the material is under compressive stress during folding.
A food packaging comprising a multi-layer metallized paper-based packaging material, the multi-layer metallized paper-based packaging material comprising, from its outer side to its inner side:
- a paper layer having a grammage comprised in the range of 40 to 120 g/m2, and wherein the paper layer has a back side Bekk smoothness in the range of about 300-1000 seconds,
- at least one pre-metallization dispersion coating layer in an amount of about 1-10 g/m2 and comprising an ethylene acrylic acid copolymer,
- a vacuum deposited metallization layer comprising an aluminium layer having a thickness in the range of 20-500 nm with an optical density of about 1-4, and
- at least one post-metallization dispersion coating layer in an amount in the range of about 0.5-10 g/m2,
- wherein the at least one post-metallization dispersion coating layer comprises:
- a post-metallization tie layer coating comprising an ethylene acrylic acid (EAA) copolymer dispersion functionalized with a methacrylic acid;
- and
- a copolymer layer comprising a plain or mineral filled ethylvinylalcohol (EVOH), butylvinyl alcohol (BVOH) or polyvinylalcohol (PVOH) copolymer layer applied on top of the post-metallization tie layer coating, wherein the multi-layer metallized paper-based packaging material has a WVTR barrier of below 1 g/m2·d (23° C., 85% RH) and/or an OTR barrier below about 3 cm3/m2·d·bar (23° C., 50% RH) after folding the material to 180° under 2 kilograms of compressive load in such a manner that the inner side of the material is under compressive stress during folding.
Dependencies are inferred from the claim text.