Injection molding system with gas flow through valve gate

Details Injection molding system with gas flow through valve gate Injection molding system with gas flow through valve gate

1989-08-28

1990-04-17

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

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

With means to heat or cool

2643288, 2643289, 26432815, 264572, 425564, 425566, 425568, 425573, B29C 4523

Patent

active

049175947

ABSTRACT:
A valve gated injection molding system for making hollow plastic products. A fixed pin extends through an elongated hollow valve member which is reciprocated between a retracted open position and a forward closed position in which the forward end of the valve member is seated in the gate. The fixed pin has a hollow portion for the flow of pressurized gas to a porous portion at the forward end which is centrally located in the gate. In the open position, gas from the fixed pin flows into the hollow center of a stream of melt which flows into the cavity around the forward end of the fixed pin to form a melt bubble in the cavity.

REFERENCES:
patent: 4101617 (1978-07-01), Friederich
patent: 4129635 (1978-12-01), Yasuike et al.
patent: 4234642 (1980-11-01), Olabisi
patent: 4555225 (1985-11-01), Hendry

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