W.l. Gore & Associates, Co., Ltd.

Munekata Industrial Machinery Co., Ltd.

Hiroshi Manabe

Masashi Ono

Tomoka Yamaguchi

Norimasa Zenitani

Hirokazu Hisano

Toshihiko Saito

It is an objective of the present invention to provide a method for producing an air-permeable composite sheet which has excellent mechanical strength and compression resistance as well as PTFE's innate property such as air-permeability, water repellency, heat resistance and chemical resistance; and a filter and a fabrics material containing the air-permeable composite sheet produced by the method as a constituent material. The method for producing an air-permeable composite sheet according to the present invention is characterized in comprising steps of filling pores of a porous PTFE sheet with a hardenable material solution; hardening or semi-hardening the porous PTFE sheet filled with the hardenable material solution; and expanding the hardened or semi-hardened porous PTFE sheet.

Method for producing air-permeable composite sheet

An object is to provide a vent plug having a structure in which an air-permeable membrane is unlikely to be damaged. More specifically, a vent plug is produced, which includes: a cylindrical memberhaving a through-hole; a supportconnected to the cylindrical memberso as to be across the through-hole; and an air-permeable membranecircumferentially attached to the cylindrical member, wherein the air-permeable membraneis held on the supportand a convex portionthat follows the shape of the supportis formed on the air-permeable membrane

Vent plug

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Tokyo, Japan

Hiroshi Manabe