Process for extruding polymer shapes with smooth, unbroken surfa

Details Process for extruding polymer shapes with smooth, unbroken surfa Process for extruding polymer shapes with smooth, unbroken surfa

1991-06-14

1993-04-20

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

26433117, 264DIG65, B29C 4782

Patent

active

052040453

ABSTRACT:
A solid state extrusion process extrudes a semi-crystalling polymer billet through a die at the end of a pressure chamber. The temperature of the die is controlled so that a thin surface layer of the polymer profile being extruded is melted to form a thin, smooth surface layer on the profile of reduced orientation and increased toughness and which is substantially free of surface imperfections.

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Bigg, Polymer Engineering and Science, vol. 28, pp. 830-841 (1988).

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