Injection molding multiple nozzle valve gating system

Details Injection molding multiple nozzle valve gating system Injection molding multiple nozzle valve gating system

1987-08-18

1988-11-22

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

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

With means to heat or cool

2643288, 425562, 425570, 425573, 425588, B29C 4522

Patent

active

047862467

ABSTRACT:
This invention relates to a multi-cavity injection molding system in which a number of nozzles are fixed to a common manifold, and valve gating is provided by actuating the manifold and the nozzles together. A pair of hydraulically actuated pistons are mounted to drive the manifold and nozzles between a retracted open position and a forward closed position. Each nozzle has a truncated tip on the forward end portion which seats in a gate in the closed position. Pressurized melt flows through a melt passage which branches in the manifold and extends through each nozzle to a melt receiving space around the forward end portion. A circumferential sealing and locating flange prevents the leakage of melt from this space as the nozzle reciprocates.

REFERENCES:
patent: 4312630 (1982-01-01), Travaglini
patent: 4557685 (1985-12-01), Gellert
patent: 4648546 (1987-03-01), Gellert
patent: 4669971 (1987-06-01), Gellert
patent: 4682944 (1987-07-01), Muller
Canadian Patent Application "Coated Injection Molding Nozzle and Method", Filed Jul. 15, 1987.
Canadian Patent Application "Injection Molding Nozzle with Hollow Sealing and Locating Flange and Method", Filed Jul. 15, 1987.
Canadian Patent Application 524,969, "Mechanism for Valve Gated Injection Molding", for Resilient Retaining Ring Filed 12-10-87.

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