Injection molding peripheral opening core ring gate

Details Injection molding peripheral opening core ring gate Injection molding peripheral opening core ring gate

1984-05-29

1985-07-23

Flint, Jr., J. Howard

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...

425548, 425DIG224, B29F 103

Patent

active

045306540

ABSTRACT:
This invention relates to an improved core ring gated injection molding system. The valve pin has a tip portion which joins a larger diameter stem portion at a tapered shoulder and extends through the cavity into the mold platen on the other side. The tip portion of the valve pin is substantially smaller in diameter than the gate through the cavity plate, thus providing for the flow of melt through the gate around it when the valve pin is in the retracted open position. In the forward closed position, the tapered shoulder seats in the gate to provide a seal. By providing for operation in reverse directions to previous core ring gated systems, this increases cooling to the mold platen in the closed position and decreases it in the open position.

REFERENCES:
patent: 3553788 (1971-01-01), Putkowski
patent: 3800027 (1974-03-01), Tsutsumi
patent: 3947177 (1976-03-01), Eckardt
patent: 4238182 (1980-12-01), Mollier
patent: 4268240 (1981-05-01), Rees et al.
patent: 4286941 (1981-09-01), Gellert

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