Extruder screw valve

Details Extruder screw valve Extruder screw valve

1977-02-07

1978-08-08

Reeves, Robert B.

Dispensing

With discharge assistant

Rotary

1375121, 13753317, 222495, 222524, 425562, B29F 104, F16K 1508

Patent

active

041051475

ABSTRACT:
The invention disclosed herein is an injection molding machine unit having a barrel, with an injection nozzle on one end of the barrel and a screw ram movable in the barrel, a valve member with axially extending grooves in the periphery thereof, supported on the ram shaft, a ring on the ram shaft adjacent the valve. The ring has axially extending grooves in its outer periphery and the ring moves out of alignment with the grooves in the valve. The grooves of the ring form a fluid flow passage for plastic material to the injection nozzle when the screw is rotated and the ram is retracted. The valve closes when the ram moves forward.

REFERENCES:
patent: 3335461 (1967-08-01), Schwartz
patent: 3438393 (1969-04-01), Godley
patent: 3590439 (1971-07-01), Swanson
patent: 3726309 (1973-04-01), Neubert

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