Process for producing molded articles of polytetrafluoroethylene resin
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United States of America Patent
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May 5, 1992
Grant Date -
N/A
app pub date -
Sep 21, 1989
filing date -
Sep 22, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
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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