Injection molding system having a valve member with a ribbed insulative portion
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United States of America Patent
Stats
-
May 8, 1990
Grant Date -
N/A
app pub date -
Feb 27, 1989
filing date -
Feb 14, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A valve gated injection molding system having a novel valve member for large volume applications. The elongated valve member has a ribbed insulative portion between the main steel portion and a conductive portion adajcent the tip end. The conductive portion provides more rapid cooling when the tip end is seated in the gate in the closed position. The adjacent insulative portion provides a thermal barrier to reduce heat flow along the valve member to the conductive portion. This combination avoids sticking of the tip end when the mold opens and thus allows cycle time to be reduced. The conductive portion has an integral beryllium copper plug which is supported by radially extending ribs of the insulative portion to withstand continual repeated impact loading every time the gate is closed.
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Cited Art Landscape
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