Extrusion process of polytetrafluoroethylene tubing materials an

Details Extrusion process of polytetrafluoroethylene tubing materials an Extrusion process of polytetrafluoroethylene tubing materials an

1978-09-22

1980-09-30

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

264209, 264312, 264323, B29F 308

Patent

active

042255473

ABSTRACT:
This application relates to a paste extrusion process using a ram type extruder wherein at least one, preferably both, of the die and mandrel of the extruder are rotated, in opposite directions when both are rotated. In preferred embodiments, the material being extruded is polytetrafluoroethylene, the mandrel has a smooth surface and the end portion of the die is heated.

REFERENCES:
patent: 2945265 (1960-07-01), Sell
patent: 3008187 (1961-11-01), Slade
patent: 3260774 (1966-07-01), Harlow
Flow Properties of Polymer Melts, Brydson, J.A., The Plastics Institute, London, 1970, pp. 63-88.

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