Melt extrusion processing method of thermoplastic resin

Details Melt extrusion processing method of thermoplastic resin Melt extrusion processing method of thermoplastic resin

1997-10-17

1999-07-27

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Vacuum treatment of work

To degas or prevent gas entrapment

26421121, 264349, B29C 4760, B29C 4776

Patent

active

059285869

ABSTRACT:
A melt extrusion processing method of a thermoplastic resin, wherein a thermoplastic resin having a flow temperature of 200.degree. C. or higher is subjected to extrusion processing using a melt kneading type extruder in which a vent port is provided at a downstream position by length L from the most upper stream portion of a melt kneading type extruder screw and L/D is from 4 to 18 (wherein D indicates the screw diameter and D and L are in the same scale unit), while continuously sucking from the said vent port at a reduced pressure of lower then 660 mmHg.
The invention provides a method which causes little resin degradation in an extruder to give an extruded article containing small amounts of discolored and degraded materials even when the processing is conducted for a relatively long time.

REFERENCES:
patent: 5552096 (1996-09-01), Auda et al.

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