Plastics-processing machine with combined performance of extrusi

Details Plastics-processing machine with combined performance of extrusi Plastics-processing machine with combined performance of extrusi

1973-11-29

1976-03-16

Gilreath, Stanley N.

B29B 106

Patent

active

039441911

ABSTRACT:
A plastics extrusion-injection molding machine comprising a screw cylinder formed with supply, compression and melting portions having boosting means formed in the supply portion to allow plastic material passing therein to fully occupy the supply section and boost the discharge pressure of the plastic material to a predetermined level high enough to permit injection molding. The machine also includes back-flow means formed in the screw member at the melting portion to allow plastic material to escape backwardly and prevent abnormally high pressure from building up in the machine.

REFERENCES:
patent: 1935050 (1933-11-01), Gordon
patent: 2595455 (1952-05-01), Heston
patent: 2680879 (1954-06-01), Schnuck
patent: 3123860 (1964-03-01), Vesilind
patent: 3169275 (1965-02-01), Compton
patent: 3850415 (1974-11-01), Hansen

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