Apparatus for the extrusion of highly oriented polymeric materia

Details Apparatus for the extrusion of highly oriented polymeric materia Apparatus for the extrusion of highly oriented polymeric materia

1976-01-29

1977-10-11

Baldwin, Robert D.

Plastic article or earthenware shaping or treating: apparatus

Control means responsive to or actuated by means sensing or...

Temperature control

425379R, 425379S, B29F 308

Patent

active

040532704

ABSTRACT:
An extrusion method and apparatus for preparing highly oriented fibers and other extrudates of thermoplastic polymeric materials. The apparatus includes a plasticating extruder leading into a reservoir having a constricted discharge orifice opening into the inlet end of an extrusion die orifice, temperature control means for maintaining certain critical temperatures within the reservoir and die, and a variable speed take-up mechanism for withdrawing the extrudate exiting from the die at a critical controlled exit rate. The method includes the steps of feeding a melt of the polymeric material under pressure from the extruder into the reservoir, and flowing the molten polymeric material through the reservoir and the constricted discharge orifice thereof into the inlet end of the die orifice in an elongational flow pattern which induces a molecular orientation in the direction of flow within the molten polymeric material and elevates the effective melting point of the flowing polymeric material as it flows through the entrance region of the die.

REFERENCES:
patent: 2567704 (1951-09-01), Grimes
patent: 3078513 (1963-02-01), Levison et al.

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