Title:
POLYTETRAFLUOROETHYLENE BLOCK-LIKE MOLDING AND ITS MANUFACTURE
Document Type and Number:
Japanese Patent JP3613996
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To reduce a material loss by baking a preform while rotating the preform, and thereby obtaining a block-line molding having an area of a melt viscosity of a specific range and a block deformed amount.
SOLUTION: After a polytetrafluoroethylene preform is inserted into a pipe, the pipe is disposed on two rolls. Then, at least one roll is rotated, and the preform is heated and baked while rotating the preform. Thus, the polytetrafluoroethylene preform is obtained. A range of a block deformation amount (%) and a melt viscosity (poise) at 380°C of the obtained block-like molding is a polygonal area surrounded by a straight line A: x=1.0×109 (melt viscosity of 1.0×109 poise), a straight line B: x=2.5×1010 (melt viscosity of 2.5×1010 pose), a straight line C1: y=7.0 (block deformation amount of 7.0%), a straight line D1: y=0 (block deformation amount of 0%) and a straight line E1: y=-8.7 long10 (x)+91.
Inventors:
Kazuo Ishiwari
Tatsuro Uchida
Masahiko Yamada
Tatsuro Uchida
Masahiko Yamada
Application Number:
JP26468198A
Publication Date:
January 26, 2005
Filing Date:
September 18, 1998
Export Citation:
Assignee:
Daikin Industries, Ltd.
International Classes:
B29C67/04; B29C43/00; B29C67/00; B29C71/02; B29D23/00; B29K27/18; (IPC1-7): B29C67/04
Domestic Patent References:
| JP4185426A | ||||
| JP6262693A | ||||
| JP6015663A |
Attorney, Agent or Firm:
Aoyama Aoi
Yasuo Shibata
Yasuo Shibata
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