A method and apparatus for making a peelable film

A method of making a peelable film comprises providing a multilayer film (26); delaminating the film into a first portion (28) and a second portion (30); treating the second portion to increase its gas permeability; and relaminating the treated second portion to the first portion. In another aspect...

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Bibliographische Detailangaben
1. Verfasser:	KOCHER, PATRICK N
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	LAYERED PRODUCTS LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM PERFORMING OPERATIONS TRANSPORTING
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Beschreibung
Zusammenfassung:	A method of making a peelable film comprises providing a multilayer film (26); delaminating the film into a first portion (28) and a second portion (30); 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 (1) for delaminating a film (26) into a first portion (28) and a second portion (30); a means (2) for treating the second portion to increase its gas permeability; and a means (4) for relaminating the treated second portion to the first portion. Perforations (72), 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.