Apparatus for manufacturing porous polytetrafluoroethylene mater

Details Apparatus for manufacturing porous polytetrafluoroethylene mater Apparatus for manufacturing porous polytetrafluoroethylene mater

1985-12-31

1987-06-09

Hoag, Willard E.

Plastic article or earthenware shaping or treating: apparatus

Continuous filament forming or film casting means with...

B29C 5500

Patent

active

046717544

ABSTRACT:
Apparatus for manufacturing a porous polytetrafluoroethylene material comprising extruding or rolling or a process consisting of the both an unsintered polytetrafluoroethylene mixture containing a liquid lubricant, and carrying out simultaneously next four steps of (a) evaporating a liquid lubricant, (b) stretching the molded articles in an unsintered condition, (c) sintering the same in a stretched condition, and (d) stretching the same in a sintered condition at an atmospheric temperature of more than 390.degree. C. to obtain mechanical strengths such as a Young's modulus of more than 10000 kg/cm.sup.2, and a matrix tensile strength of more than 1100 kg/cm.sup.2.

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patent: 4553929 (1985-11-01), Kanatani et al.

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