Method for forming a breathable film

B - Operations – Transporting – 29 – C

Patent

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B29C 55/18 (2006.01)

Patent

CA 2289671

A film (12) which is a blend of a thermoplastic polymer and an inorganic filler is fed between a first roll (52) and a second roll (54). The first roll has a plurality of toothed regions (56) spaced apart by a plurality of grooved regions (58). The toothed regions include a plurality of teeth (57). The second roll has a plurality of teeth (61) which mesh with the teeth on the first roll. As the film is fed between the first roll and the second roll the portion of the film passing between the grooved regions on the first roll and the teeth on the second roll remains substantially planar forming first regions (64) in the film while the portion of the film passing between the teeth on the first roll and the teeth on the second roll are foamed into second regions (66) having raised rib-like elements.

Un film (12) constitué d'un mélange de polymère thermoplastique et d'une charge inorganique est envoyé entre un premier (52) et un deuxième rouleau (54). Le premier rouleau présente plusieurs zones dentées (56) séparées par plusieurs zones cannelées (58). Les régions dentées présentent plusieurs dents (57). Le deuxième rouleau présente plusieurs dents (61) qui s'engrènent avec les dents du premier rouleau. A mesure que le film est avancé entre les premier et deuxième rouleaux, la partie du film passant entre les régions cannelées du premier rouleau et les dents du deuxième rouleau reste sensiblement plane, ce qui forme des premières zones (64) dans le film, alors des deuxièmes régions (66) du type nervure sont formées dans la partie du film passant entre les dents du premier rouleau et les dents du deuxième rouleau.

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