Valve to valve melt transfer device

Details Valve to valve melt transfer device Valve to valve melt transfer device

2005-10-18

2005-10-18

Heitbrink, Tim (Department: 1722)

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

With means between charger and mold to cut off flow of...

C264S328800, C425S572000, C425S574000

Reexamination Certificate

active

06955534

ABSTRACT:
A stack or tandem injection molding apparatus includes a first melt transfer nozzle coupled to a stationary platen and a second melt transfer nozzle coupled to a movable platen. A melt transfer device includes a first valve pin extending through a first melt transfer channel of the first melt transfer nozzle and a second valve pin extending through a second melt transfer channel of the second melt transfer nozzle. At least one groove is provided in the outer surface of the first valve pin. The first valve pin is movable relative to the first and second melt transfer nozzles to selectively locate the groove across a portion of the first melt transfer channel and a portion of the second melt transfer channel to allow melt to flow therebetween in the mold closed position and to prevent drooling in the mold open position.

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