Patent · US Expired

Method for joining together shaped bodies of polytetrafluoroethylene

US4197149A · kind A · utility

21Cited by

6References

14Claims

0Family size

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 6, 1978
Grant date	Apr 8, 1980
Priority date	—
Expiry date	Jan 6, 1998

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB29L2023/22
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

Method and apparatus for joining together edge surfaces of polytetrafluoroethylene material by a butt joint in which clamps along the abutting surfaces press together the abutting surfaces, heating means spaced from and out of direct contact with a strip between the clamps heats the strip by radiation or convection, and a cooling arrangement is provided via the clamps to remove heat from the clamping zone. A thin foil of a fluorine-containing thermoplastic inserted between the abutting surfaces facilitates joining of the surfaces.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.