Process for producing molded articles of polytetrafluoroethylene

Details Process for producing molded articles of polytetrafluoroethylene Process for producing molded articles of polytetrafluoroethylene

1989-09-21

1992-05-05

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Forming articles by uniting randomly associated particles

Autogenously or by activation of dry coated particles

264162, 2642091, 264334, 264323, 264337, 264338, 425380, 425393, B29C 4790

Patent

active

051105268

ABSTRACT:
In accordance with the present invention, there is provided a process for producing polytetrafluoroethylene (PTFE) resin molded articles, wherein an unsintered PTFE resin paste extrusion molded article as extruded from an extrusion machine and inserted into a sintering mold having an inside diameter slightly larger than an outside diameter of said unsintered PTFE resin molded article is sintered at a temperature higher than a melting point of the PTFE resin. In another aspect of the invention, PTFE resin molded articles are produced by a process wherein an unsintered PTFE resin paste extrusion molded article immediately after being extruded from an extrusion machine is sized by means of a sizing die, and the unsintered PTFE molded article thus sized is inserted into a sintering mold having an inside diameter slightly larger than an outside diameter of said unsintered molded article, followed by sintering at a temperature higher than a melting point of the PTFE resin. The sintering mold used in both of the processes of the invention preferably has on its inner peripheral surface a slip layer less in frictional resistance.

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