Joining together shaped bodies of polytetrafluoroethylene
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United States of America Patent
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-
Jul 8, 1980
Issued Date -
N/A
app pub date -
Jan 9, 1978
filing date -
Nov 5, 1975
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Method and apparatus for joining together edge surfaces of polytetrafluoroethylene material by a butt joint in which abutting surfaces of the material are placed in a chamber bounded by clamps along the abutting surfaces which press together the abutting surfaces, and heating elements in the space between the clamps to heat both sides of the material between the clamps, the boundaries of the chamber inhibiting the volume expansion of the material resulting from heating. Pressure generated in chamber may be controlled by moving a heating element. Additional pressure during cooling-down is exerted on the butt joint by moving one clamping in the direction of the butt joint. A thin foil of a fluorine-containing thermoplastic inserted between the abutting surfaces facilitates joining of the surfaces.
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