Pressure-activated gas injection valve for an injection molding

Details Pressure-activated gas injection valve for an injection molding Pressure-activated gas injection valve for an injection molding

1998-07-13

2000-08-08

Heitbrink, Tim

Plastic article or earthenware shaping or treating: apparatus

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

264572, 425564, 425566, A21C 300

Patent

active

060992840

ABSTRACT:
A pressure-activated valve for conducting pressurized gas into a mold cavity of an injection molding apparatus is preferably constructed as an easily replaceable unit. The preferred valve includes a pin having a flared head section. The head section has a planar face transverse to an axis of the pin so as to approximately conform to a neighboring contour of the mold cavity. The valve also includes a body in which a passageway intersects a second end of the body to define a port and a flaring seat communicates through a first end of the body between the passageway and the mold cavity. A restrainer which abuts against the second end of the body includes a guideway aligned with the passageway through the body as well as at least one cross-channel which admits pressurized gas to that passageway through the port. The pin extends through both the passageway and the guideway so that its head portion is positioned near the seat. A spring retainer threadedly engages an end portion of the pin which projects out of the guideway in the restrainer. A coiled compression spring encircling the restrainer is compressed between the spring retainer and the second end of the body so that the spring force urges the head section of the pin against the seat to close the valve. The valve allows the pressurized gas to flow into the mold cavity while preventing the molding composition from flowing back and obstructing a supply of pressurized gas to the valve.

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