Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With means to heat or cool
Patent
1982-03-24
1984-01-24
Pavelko, Thomas P.
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
With means to heat or cool
425563, 425564, B29F 103, B29F 108
Patent
active
044273614
ABSTRACT:
A shut-off nozzle for injecting molten resin into a mould cavity comprises a cylinder to be connected to a moulding machine, a nozzle head attached to the front end of the cylinder to be connected to a mould, a flow path for molten resin through the cylinder and the nozzle head, a torpedo disposed in the flow path, and a shut-off pin protruding from the front end of the torpedo. The torpedo is of a streamline shape and is divided into a front portion having a hole and a rear portion having a cavity. A spring is disposed in the cavity applying forward force onto the shut-off pin. The cross sectional area of the shut-off pin to accept pressure of molten resin and the force of the spring are adjusted so that the shut-off pin is in the front position until the pressure of molten resin becomes a predetermined value.
REFERENCES:
patent: 3095609 (1963-07-01), Lievre
patent: 3871805 (1975-03-01), Jacobs
patent: 3954209 (1976-05-01), Ramond
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