Joining together shaped bodies of polytetrafluoroethylene

US4211594A · kind A · utility

Assignee

• Sigri Elektrographit GmbH · DE

Inventors

• Gunter Freitag · Munich, DE
• Alfred Krahl · Eschborn, DE
• Gerhard Ullmann · Groß-Gerau, DE
• Gunter Wenzel

Key dates

• Filing date: Jan 9, 1978
• Grant date: Jul 8, 1980
• Expiry date: Jan 9, 1998

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29K2027/12
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

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.