Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With means to heat or cool
Patent
1984-01-04
1985-06-04
Silbaugh, Jan
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
With means to heat or cool
26432815, 425549, 425552, 425566, B29F 103, B29F 108
Patent
active
045211795
ABSTRACT:
This invention relates to a movel core ring gated injection molding system. Pressurized melt from a molding machine flows through the system and into a cavity. A gate leading to the cavity and a bore in the movable mold platen are in alignment and of the same size to receive the head portion of the valve pin which extends from a reduced neck portion. Actuating mechanism drives the valve pin between a retracted closed position to an open position in which the reduced neck portion extends into the cavity. In the closed position, the head portion of the valve pin extends a considerable distance into the bore in the mold platen to provide sufficient cooling to rapidly cool the melt in the cavity adjacent the pin. In one embodiment, the valve pin has a hollow portion adjacent the neck portion to provide the valve pin with thermal separation between the hot melt and the cool mold platen. In another embodiment, the valve pin has a copper portion between the hollow portion and the tip end to promote cooling of the melt in the cavity.
REFERENCES:
patent: 2940123 (1960-06-01), Beck et al.
patent: 3800027 (1974-03-01), Tsutsumi
patent: 4125352 (1978-11-01), Gellert
patent: 4268240 (1981-05-01), Rees et al.
patent: 4279582 (1981-07-01), Osuna-Diaz
patent: 4303382 (1981-12-01), Gellert
Mold Masters Melt Conveying Technology with Master-Shot Nozzles: brochure, 22 pp., 1982 Georgetown, Ontario, Canada.
Lorin Hubert C.
Silbaugh Jan
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