Injection molding machine and method of operation thereof

Details Injection molding machine and method of operation thereof Injection molding machine and method of operation thereof

1975-03-06

1976-10-12

Jenkins, Robert W.

B29B 106

Patent

active

039853497

ABSTRACT:
Improved mixing is obtained in a reciprocating screw injection molding machine by providing an axial passage within the screw. The passage provides communication between the discharge end of the screw and an upstream location. A valve is disposed within the passage to provide selective communication. Recirculation of melt within the passage and about the screw provides improved mixing.

REFERENCES:
patent: 3175248 (1965-03-01), Swenson
patent: 3712594 (1973-01-01), Hensen
patent: 3737151 (1973-06-01), Schaeffer
patent: 3746318 (1973-07-01), Schippers

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