Valve for co-injection molding apparatus

Details Valve for co-injection molding apparatus Valve for co-injection molding apparatus

2007-12-18

2010-06-08

Heitbrink, Tim (Department: 1791)

Plastic article or earthenware shaping or treating: apparatus

Means feeding fluent stock from plural sources to common...

C425S564000, C425S572000

Reexamination Certificate

active

07731489

ABSTRACT:
A coinjection molding apparatus includes at least one manifold having a first manifold melt channel and a second manifold melt channel. A hot runner nozzle is located between the manifold and a mold gate. The nozzle has melt channels communicating with the first manifold melt channel and the second manifold melt channel. A valve has a movable valve member for increasing and decreasing flow of melt in one of the melt channels of the nozzle. The valve member receives a pressure force from the melt. An actuator provides a control force to the valve member. The valve member moves in response to a difference between the pressure force and the control force.

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