Production of string-like polytetrafluoroethylene

Details Production of string-like polytetrafluoroethylene Production of string-like polytetrafluoroethylene

1982-07-02

1985-01-29

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Forming articles by uniting randomly associated particles

Autogenously or by activation of dry coated particles

28245, 2642888, 2642905, B29F 502

Patent

active

044965079

ABSTRACT:
A process for producing a tube or rod of a polytetrafluoroethylene is described. The process comprises molding a polytetrafluoroethylene containing a liquid lubricant into a tube or rod by a paste process, removing the liquid lubricant, stretching the tube or rod in the lengthwise direction, and thereafter, by sintering the stretched tube or rod at a temperature of at least 327.degree. C. wherein the stretching of the tube or rod is carried out by the use of at least one pair of heating rolls which are each provided with a plurality of grooves. The process provided uniform stretching making it possible to produce a tube or rod with very small internal diameter.

REFERENCES:
patent: 3953566 (1976-04-01), Gore
patent: 4248924 (1981-02-01), Okita

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