Encapsulted barrier for flexible films and a method of...

B - Operations – Transporting – 32 – B

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B32B 27/08 (2006.01)

Patent

CA 2579555

A film structure having an inner barrier layer comprised of a blend of a polyamide and ethylene vinyl alcohol copolymer. The polyamide is present in the blend in an amount of from 15- 40%, and most preferably from 25-30%. The inner barrier layer is laminated on each side with a layer of a polyamide. The preferred polyamide is nylon, and particularly nylon 6. In a preferred embodiment, the film structure is layered with an oxide or ceramic layer. Included is a method of manufacturing the film and for using the film structure to package a product in a retort packaging process.

Cette invention concerne une structure de film comportant une couche écran interne fait d'un mélange de polyamide et d'un copolymère d'alcool de vinyle éthylène. La teneur en polyamide du mélange est de 15- 40 %, idéalement de 25-30 %. La couche écran interne est laminée de part et d'autre avec une couche de polyamide. Le polyamide préféré est le Nylon, en particulier le Nylon 12. Dans un mode de réalisation préféré, la structure de film est enduite d'une couche d'oxyde ou de céramique. Sont également décrits un procédé de fabrication du film et une méthode d'utilisation de la structure de film pour le conditionnement d'un produit par autoclave.

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