Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With means to heat or cool
Patent
1989-02-27
1990-05-08
Woo, Jay H.
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
With means to heat or cool
2643289, 26432815, 425562, 425564, 425566, 425568, 425570, B29C 4523
Patent
active
049233874
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.
REFERENCES:
patent: 4521179 (1985-06-01), Gellert
patent: 4657496 (1987-04-01), Ozeki et al.
patent: 4712995 (1987-12-01), Basnett
patent: 4717324 (1988-01-01), Schad et al.
patent: 4740151 (1988-04-01), Schmidt et al.
Heitbrink Timothy W.
Woo Jay H.
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