Check valve assembly for injection molding machine

Details Check valve assembly for injection molding machine Check valve assembly for injection molding machine

1985-09-05

1987-02-17

Woo, Jay H.

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...

425564, 425DIG224, 366 77, B29C 4760

Patent

active

046436650

ABSTRACT:
An improved check valve assembly which is mounted on the front end of a feedscrew of an injection molding machine having a check ring which is slidably mounted on the shank of a retainer within the heated barrel of the molding machine. An annular-shaped flow gap is formed between the inner periphery of the check ring and retainer shank for feeding cylindrical-shaped sleeves of heated material into a discharge chamber at the forward end of the barrel. The check ring is movable between a forward material feed position where it is engaged with a front valve seat and a rearward material blocking position where it is engaged with a rear valve seat. An annular groove concentric with the annular-shaped material flow gap is formed in the front face of the front valve seat and has an average depth at least equal to the thickness of the sleeve of material moving through the flow gap to permit the sleeve of material to flow unrestricted from the gap and past the front valve seat and into a plurality of flutes for discharge into the discharge chamber.

REFERENCES:
patent: 2940123 (1960-06-01), Beck et al.
patent: 3007202 (1961-11-01), Wucher
patent: 3319299 (1967-05-01), Kiraly
patent: 3335461 (1967-08-01), Schwartz
patent: 3590439 (1971-07-01), Swanson
patent: 4062479 (1977-12-01), Szabo
patent: 4105147 (1978-08-01), Stubbe
patent: 4349044 (1982-09-01), Schirmer
patent: 4394117 (1983-07-01), Taylor
Mallard Machine Company, advertising brochure entitled Adaptability with Respect to the Mallard Non-Return Ring Valve.

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