Plastic and nonmetallic article shaping or treating: processes – Vacuum treatment of work – To degas or prevent gas entrapment
Patent
1999-07-01
2000-11-21
Heitbrink, Jill L.
Plastic and nonmetallic article shaping or treating: processes
Vacuum treatment of work
To degas or prevent gas entrapment
26432817, 264349, 366 78, 366 83, 425204, B29C 4550
Patent
active
061498467
ABSTRACT:
A method of mixing first and second molding components in a non-intermeshing twin screw compounder having a discharge opening wherein the first component is added around a first of the two rotating screws at a point remote from the discharge opening, the second component is added around the first screw nearer the discharge opening, vacuum is applied to the mixing components nearer the discharge opening, rotation of the two screws is stopped, and the second screw is axially moved toward the discharge opening to eject mixed components from the compounder and into a female mold.
REFERENCES:
patent: 5106564 (1992-04-01), Iwanami et al.
patent: 5165941 (1992-11-01), Hawley
patent: 5205973 (1993-04-01), Kafka
patent: 5728337 (1998-03-01), Yoshikawa et al.
patent: 5951928 (1999-09-01), Jinping
patent: 5968429 (1999-10-01), Treece et al.
Bigio David
Zerafati-Jahromi Mohammad Saeid
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