Hot runner system for coinjection molding
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
May 16, 2000
Grant Date -
N/A
app pub date -
Sep 2, 1997
filing date -
Sep 2, 1997
priority date (Note) -
In Force
status (Latency Note)
Importance
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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Cited Art Landscape
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