公开(公告)号：US11890797B2

公开(公告)日：2024-02-06

申请号：US17294512

申请日：2019-11-11

申请人： CHONGQING BOMAN NEW MATERIAL CO., LTD.

发明人： Katsutoshi Yamamoto ,  Michiko Sawai ,  Asami Masuda ,  Shigemi Oikawa

IPC分类号： B29C48/00 ,  B29C43/24 ,  B29C55/06 ,  B29C71/02 ,  C08J5/18 ,  B29C71/00 ,  B29C55/12 ,  B29C55/02 ,  B29K27/18 ,  B29C67/04

CPC分类号： B29C48/0011 ,  B29C43/24 ,  B29C48/002 ,  B29C48/0018 ,  B29C55/023 ,  B29C55/06 ,  B29C55/12 ,  B29C71/0009 ,  B29C71/02 ,  C08J5/18 ,  B29C67/04 ,  B29K2027/18 ,  C08J2327/18

摘要： A method for preparing an unsintered PTFE film capable of being continuously formed and with uniform density distribution and high density. The method for preparing the unsintered PTFE film includes filling a mixture obtained by adding a forming aid to PTFE fine powder in an extrusion forming die, extruding the filled mixture from the extrusion forming die to produce an extrusion forming body, rolling the extrusion forming body with a roll to produce a forming aid-removed film without the forming aid, and pinching the forming aid-removed film into a pinch roll made of a rubber roll formed by coating rubber on a metal shaft core at room temperature and compressing the forming aid-removed film so that thickness of the forming aid-removed film is reduced and density thereof is above 2.0 g/cm3.