Title: Method for joining together shaped bodies of polytetrafluoroethylene

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.

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Inventors: Freitag, Gunter (Frankfurt am Main-Hochst, DE, US)
Krahl, Alfred (Eschborn II, DE, US)
Ullmann, Gerhard (Gross-Gerau, DE, US)
Wenzel, Gunter (Kelkheim, DE, US)

Application Number: 867533
Filing Date: 1978-01-06
Publication_date: 1980-04-08
Assignee: Sigri Elektrographit GmbH (Meitingen bei Augsburg, DE)
Primary Class(es): 156/154 156/273.7, 156/282, 156/296, 156/304.3, 156/306.6, 156/308.2, 156/311, 156/333
Other Classes:
US Patent Ref:

3117903	Jan, 1964	Hix	156/158.
3356551	Dec, 1967	Glenn et al.	156/158.
3468732	Sep, 1969	Hewitt	156/304.
3574804	Apr, 1971	Joonase	156/282.
3727289	Apr, 1973	Bemelmann et al.	156/304.
3865662	Feb, 1975	Segal	156/304.

Other Refs: 2163420

Jul, 1973	FR.

Primary Examiner: Goolkasian, John T.
Assistant Examiner: Bokan, Thomas
Attorney: Lerner; Herbert L.