Molding process for preparing porous polytetrafluoroethylene art

Details Molding process for preparing porous polytetrafluoroethylene art Molding process for preparing porous polytetrafluoroethylene art

1992-04-02

1992-10-13

Foelak, Morton

Plastic and nonmetallic article shaping or treating: processes

Forming articles by uniting randomly associated particles

Autogenously or by activation of dry coated particles

264118, 521145, 521134, 521919, B29C 4754, B29C 5900, B29C 5518

Patent

active

051548666

ABSTRACT:
A molding process for preparing long and thick, large porous PTFE articles comprising preparation steps of a powder for molding which includes a step of gelation of PTFE powder; a pre-forming step by a ram-extrusion; a baking step of the pre-formed article under a non-constrained circumstance; and if necessary, a cooling step; said powder for molding being containing a binder which has a melting point of lower than that of PTFE and does not decompose at a baking temperature of PTFE.

REFERENCES:
patent: 4650815 (1987-03-01), Nambo et al.
patent: 4760102 (1988-07-01), Moriyama et al.
patent: 5098625 (1992-03-01), Huang et al.
patent: 5104400 (1992-04-01), Berquer et al.

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