ポリテトラフルオロエチレン製シートまたはフィルム、それから得られるガスケットテープおよびそれらの製造法

Japanese Patent JP3742568

B2

To provide a method of producing a uniaxially stretched polytetrafluoroethylene gasket tape, which comprises: (1) a step for preparing a paste comprising a mixture of a polytetrafluoroethylene powder obtained by emulsion polymerization and an extrusion aid, (2) a step for extruding the paste by means of an extruder equipped with a die which has plural separators inside an orifice thereof having a rectangular cross section, (3) a step for rolling, in the extruding direction, an extrudate having slit lines to give a rolled polytetrafluoroethylene sheet, (4) a step for uniaxially stretching the rolled sheet in the rolling direction after removing the extrusion aid from the rolled sheet, and (5) a step for heat-treating the obtained uniaxially stretched polytetrafluoroethylene sheet. The die of the extruder has plural sheet-like separators in the orifice thereof having a rectangular cross section. The separators are mounted so that free ends thereof are located at a point exceeding a center point of a long side of the orifice, and function to provide slit lines inside the extrudate in parallel with the long side of the orifice. The high performance inexpensive PTFE gasket tape is produced by the uniaxially stretching method and has properties equal to those of biaxially stretched PTFE gasket tape.

Masao Huang
Zhou Kin Shun
Zhou Kin Jie
Chen Xiamu
Lee
Yellow Rei
Huang Keop

JP2001189470A

February 08, 2006

June 22, 2001

Click for automatic bibliography generation  

Umei Tai Chemical Industry Co., Ltd.

B29C55/06; C08J5/18; B29C48/08; B29C48/30; B29C48/305; B29C55/00; B29C55/18; C08J7/00; C08K3/00; C08K5/17; C08L27/18; B29K27/18

JP10237203A
JP2000300984A
JP5301267A
JP3179039A
JP9141734A
JP62297109A
JP8505430A

Sota Asahina
Kei Saki
Fumio Akiyama
Hiromu Tanaka

Previous Patent: VACUUM DEPOSITION SYSTEM AND VACUUM DEPOSITION PROCESS

Next Patent: METAL PANEL AND METHOD FOR MANUFACTURING THE SAME