Injection screw

Details Injection screw Injection screw

1994-09-26

1996-05-21

Heitbrink, Tim

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

With means between charger and mold to cut off flow of...

425563, 425564, B29C 4523

Patent

active

055183948

ABSTRACT:
A penetration hole of plasticized resin is pierced in a screw head, so that the resin may be accumulated in uniform temperature distribution without sacrificing the function of the injection screw. More specifically, a penetration hole 15 of plasticized resin is pierced inside a screw head 13 at the front end of a screw 12 from the front middle to the rear periphery so as to communicate between the screw peripheral parts and the screw head front space. A ring valve 17 for opening and closing a rear opening 15a of the penetration hole 15, and closing the gap around the screw head is fitted to the rear periphery of the screw head 13 so as to be free to move back and forth.

REFERENCES:
patent: 4512733 (1985-04-01), Eichlseder et al.
patent: 4678427 (1987-07-01), Fritzsche

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