Hot runner system for coinjection molding

Details Hot runner system for coinjection molding Hot runner system for coinjection molding

1997-09-02

2000-05-16

Heitbrink, Tim

Plastic article or earthenware shaping or treating: apparatus

Means feeding fluent stock from plural sources to common...

264255, 425549, B29C 4523

Patent

active

060628405

ABSTRACT:
A coinjection molding system for injecting skin and core material into a mold cavity. The system includes a three position actuator for moving a valve pin into a closed position in which neither skin nor core flow is permitted, a middle position in which only skin flow is permitted, and an open position in which skin and core flow is permitted. The actuator includes a first piston slidably mounted in an actuator housing, and a second piston, attached to the valve pin, slidably mounted within the first piston. A shut-off is provided in the manifold for preventing skin flow to a particular nozzle during sequential gating.

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Injection Molding Magazine, Nov. 1996, "Coinjection hot runner basics".

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