Patent ID: 6062840
Filing Date: 2000-05-16
Classification: B29C

Abstract:
A valve pin actuator for a coinjection molding system in which the valve pin actuator supports a valve pin adapted to control skin material flow and core material flow at a gate to a mold cavity, comprising:an actuator body;a first member movably mounted within said actuator body;a second member movably mounted within said actuator body, said second member adapted to support said valve pin such that movement of said second member causes movement of said valve pin, wherein said first and second members are each movable to a plurality of positions to control movement of the valve pin to reciprocate to three separate positions, including:a first position in which the valve pin alone closes the gate and blocks both skin and core material flow to the gate;a second position remote from the gate relative to the first position, in which movement of the valve pin to the second position permits skin material flow and blocks core material flow to the gate; anda third position remote from the gate relative to the second position, in which movement of the valve pin to the third position permits both skin material flow and core material flow to the gate.