A method and apparatus for making a peelable film

B - Operations – Transporting – 32 – B

Patent

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Details

B32B 7/06 (2006.01) B32B 3/24 (2006.01) B32B 27/32 (2006.01) B32B 38/04 (2006.01)

Patent

CA 2220446

A method of making a peelable film comprises providing a multilayer film; delaminating the film into a first portion and a second portion; treating the second portion to increase its gas permeability; and relaminating the treated second portion to the first portion. In another aspect of the invention, an apparatus for making a peelable film comprises a means for delaminating a film into a first portion and a second portion; a means for treating the second portion to increase its gas permeability; and a means for relaminating the treated second portion to the first portion. Perforations, partial perforations, and other film treatments can be thus advantageously utilized in connection with a second, preferably gas permeable portion of a peelable film, without affecting a first, preferably gas impermeable portion of the same film.

Méthode pour la fabrication d'une pellicule pelable, cette méthode comportant la production d'une pellicule multicouches, la séparation de cette pellicule en première et deuxième couches, opération suivie d'un traitement destiné à accroître la perméabilité au gaz de la deuxième couche laquelle, ainsi traitée, est ensuite recollée à la première couche. Un autre aspect visé par la présente invention se rapporte à l'installation permettant la fabrication d'une pellicule pelable, suivie de la séparation de cette pellicule en première et deuxième couches et de l'application d'un traitement destiné à accroître la perméabilité au gaz de la deuxième couche avant le recollage de la couche ainsi traitée à la première couche. Des traitements de perforation, de perforation partielle, ainsi que d'autres traitements peuvent ainsi être appliqués avantageusement à la deuxième couche, de préférence perméable au gaz, d'une pellicule pelable multicouches en éliminant les risques d'effets indésirables au niveau de la première couche de la pellicule en question.

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