Nippon Valqua Industries, Ltd.

Hitachi Construction Machinery Co., Ltd.

Tatsuo Takamure

Hideki Akita

Osamu Gokita

Yasushi Aburatani

Toshikiyo Komazawa

Hiromasa Muraki

Noriyuki Ando

A method for forming a porous PTFE layer includes steps of: combining one or at least two unburned porous PTFE films and a support body that can withstand a heating condition in the following process (a rod or plate shaped support body made of mesh or the like is preferable) by using a predetermined means in such a manner that a slip can be prevented in a heating treatment in the following process; and heating the matter resulted from the above process at a temperature of at least 150&#xb0; C. and less than the melting point of the PTFE film for the range of 5-120 minutes (preferably at a temperature in the range of the melting point of a thermoplastic resin fiber to 320&#xb0; C. for the range of 10-60 minutes in the case in which the thermoplastic resin fiber or the like is used in the process).

Method for forming porous PTFE layer

A method forming a porous PTFE layer includes steps of: combining one or at least two unburned porous PTFE films and a support body that can withstand a heating condition in the following process (a rod or plate shaped support body made of mesh or the like is preferable) by using a predetermined means in such a manner that a slip can be prevented in a heating treatment in the following process; and heating the matter resulted from the above process at a temperature of at least 150&#xb0; C. and less than the melting point of the PTFE film for the range of 5-120 minutes (preferably at a temperature in the range of the melting point of a thermoplastic resin fiber to 320&#xb0; C. for the range of 10-60 minutes in the case in which the thermoplastic resin fiber or the like is used in the process).

Method for forming porous PTFE layer, and porous PTFE layer and molded product that are obtained by the forming method

A method forming a porous PTFE layer includes steps of: combining one or at least two unburned porous PTFE films and a support body that can withstand a heating condition in the following process (a rod or plate shaped support body made of mesh or the like is preferable) by using a predetermined means in such a manner that a slip can be prevented in a heating treatment in the following process; and heating the matter resulted from the above process at a temperature of at least 150&#xb0; C. and less than the melting point of the PTFE film for the range of 5-120 minutes (preferably at a temperature in the range of the melting point of a thermoplastic resin fiber to 320&#xb0; C. for the range of 10-60 minutes in the case in which the thermoplastic resin fiber or the like is used in the process.

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Tokyo, Japan

Tatsuo Takamure