Check valve assembly for injection molding apparatus

Details Check valve assembly for injection molding apparatus Check valve assembly for injection molding apparatus

1991-07-29

1992-12-01

Heitbrink, Tim

Plastic article or earthenware shaping or treating: apparatus

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

With accumulator, trap chamber, or serially arranged valves...

425563, B29C 4552

Patent

active

051679710

ABSTRACT:
This invention provides an improved injection molding apparatus which includes a check valve assembly mounted at the forward end of a feedscrew, the valve assembly being characterized by forward and rearward valve seat surfaces which co-act in a first position to allow a plasticized polymeric material to enter and flow through the valve into an injection chamber and which co-act in a second position to stop any additional material from entering the valve assembly. The second valve position is effected by a feedscrew injection stroke which generates a backpressure to close the valve, the backpressure moving a check ring of the valve assembly into a position to block entry into the valve. The valve seat surfaces are coated with a bonded metal, metal alloy, or ceramic material which effectively increases the abrasion resistance of the valve seat surfaces and thus also increases the wear service life of the check valve assembly. Other wear surfaces of the valve assembly may also be coated for abrasion resistance.

REFERENCES:
patent: 3209408 (1965-10-01), Kelly
patent: 3698694 (1972-10-01), Zeug et al.
patent: 3936038 (1976-02-01), Olmsted
patent: 4105147 (1978-08-01), Stubbe
patent: 4106113 (1978-08-01), Laimer et al.
patent: 4472058 (1984-09-01), Pirro
patent: 4530605 (1985-07-01), Eichlseder et al.
patent: 4862907 (1989-09-01), Ledtje et al.
patent: 4909724 (1990-03-01), Sonoda et al.
patent: 4988281 (1991-01-01), Heathe et al.

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