Method for shaping a plastic membrane

Details Method for shaping a plastic membrane Method for shaping a plastic membrane

1976-07-19

1978-08-22

Pavelko, Thomas P.

Plastic and nonmetallic article shaping or treating: processes

Forming articles by uniting randomly associated particles

Autogenously or by activation of dry coated particles

264295, 264316, 264339, B27J 500

Patent

active

041089383

ABSTRACT:
A membrane of a porous unexpanded polytetrafluoroethylene (PTFE), such as that made by the matrix technique disclosed in U.S. Pat. No. 3,497,256, issued Feb. 24, 1970, in sheet form is sandwiched between metal foil layers that are stiff enough to take a dead set crimp; the three layer composite is passed through corrugating gears; the corrugated composite is indexed between two grooved plates under moderate pressure and the composite is heated while between the plates to heat set the plastic membrane; then the metal foil layers are removed after cooling.

REFERENCES:
patent: 1587462 (1926-06-01), Adams
patent: 3497256 (1970-02-01), Rosenblatt

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