Patents
United States Patent 3985349
Douris , ê et al. October 12, 1976
Injection molding machine and method of operation thereof
Ritzie October 12, 1976
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.
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