Method for manufacturing an air permeable composite film

Details Method for manufacturing an air permeable composite film Method for manufacturing an air permeable composite film

B - Operations, Transporting

32

B

B32B 27/28 (2006.01) B32B 27/14 (2006.01) B32B 33/00 (2006.01) B32B 38/04 (2006.01) B65D 30/08 (2006.01) B65D 33/25 (2006.01) B65D 81/34 (2006.01)

Patent

CA 2635751

A method for manufacturing a novel air permeable composite film (102) is disclosed. The air permeable composite film has a polymer layer (10) with a top face (12) and a bottom face (14) and a sealing layer (16) covering the top face. The polymer layer is first perforated by virtue of an impression process to form a plurality of tiny gaps (15) in it for air permeation. Then the sealing layer is coated on the top face of the polymer layer to fill the gaps. The differential pressure between the top face and bottom face of the polymer layer enlarges the gaps and makes the gaps become air permeable.

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