Polymer-coated heat-sealable packaging material and a sealed...

B - Operations – Transporting – 65 – D

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Details

B65D 65/40 (2006.01) B32B 27/28 (2006.01) B65D 81/24 (2006.01)

Patent

CA 2659377

The invention relates to a heat-sealable packaging material and a sealed package formed from the same, especially for packaging foodstuffs. The packaging material comprises a base layer of paper or board and polymeric heat-sealable layers on one side of the base layer or, preferably, on both sides thereof. According to the invention, at least two layers of ethylene vinyl alcohol copolymer (EVOH) with different fractions of ethylene monomer are arranged on the packaging material to provide an oxygen barrier. The layers can locate against each other without a tie layer between them. The heat-sealable polymer can be a polyolefin, and, in addition, other polymeric barrier layers can be incorporated into the material to improve its oxygen, fat and aroma tightness.

L'invention concerne un matériau d'emballage thermoscellable et un emballage scellé fabriqué à partir de ce matériau, notamment destiné à l'emballage d'aliments. Le matériau d'emballage comporte une couche de base de papier ou de carton, et des couches thermoscellables polymères sur un côté de la couche de base, ou de préférence sur les deux côtés de la couche de base. Selon l'invention, au moins deux couches de copolymère d'éthylène alcool de vinyle (EVOH) contenant des fractions différentes de monomère d'éthylène sont disposées sur le matériau d'emballage de manière à constituer une barrière à l'oxygène. Les couches peuvent être directement en contact les unes avec les autres sans présenter de couche de liaison entre elles. Le polymère thermoscellable peut être une polyoléfine, et en outre, d'autres couches barrières polymères peuvent être intégrées au matériau afin d'améliorer son étanchéité à l'oxygène, aux graisses et aux arômes.

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