| 摘要 |
A coinjection molding system for injecting skin and core material into a mol d cavity. The system includes a three position actuator for moving a valve pin into a clos ed position in which neither skin nor core flow is permitted, a middle position in which only ski n flow is permitted, and an open position in which skin and core flow is permitted. The actuator incl udes a first piston slidably mounted in an actuator housing, and a second piston, attached to th e 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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