Process for producing polyolefin microporous breathable film

Details Process for producing polyolefin microporous breathable film Process for producing polyolefin microporous breathable film

B - Operations, Transporting

29

C

B29C 55/18 (2006.01)

Patent

CA 2346455

Polyolefin/filler breathable films may be produced by machine or transverse direction orientation using interdigitating grooved rollers (16, 26). Biaxial orientation to similarly produce breathable films may be accomplished by the same method. By heating the rollers (16, 26), the breathablity of the film is increased without increasing the depth of engagement of the interdigitating rollers.

Cette invention se rapporte à des films imper-respirants avec polyoléfines/charges, que l'on peut produire dans le sens machine ou dans le sens travers, en utilisant des cylindres rainurés interdigités (16, 26). Une orientation biaxiale permettant de produire des films imper-respirants de la même manière peut être réalisée à l'aide de ce même procédé. En chauffant les cylindres (16, 26), on accroît l'imper-respirabilité des films sans augmenter la profondeur d'engagement des cylindres interdigités.

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