Vent type injection molding machine

Details Vent type injection molding machine Vent type injection molding machine

1989-04-06

1990-08-07

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

Control means responsive to or actuated by means sensing or...

425153, 425203, 425587, 425812, B29C 4776

Patent

active

049463560

ABSTRACT:
In a vent type injection molding machine having a screw contained in a heating cylinder, there are provided a plurality axially spaced apart vent openings located at intermediate points of the heating cylinder for venting inside of the heating cylinder to the outside and control means for selectively opening and closing the vent openings in accordance with the position of the screw in the heating cylinder or the pressure of a thermoplastic resin injected by the injection molding machine.

REFERENCES:
patent: 3376603 (1968-04-01), Colombo
patent: 3737151 (1973-06-01), Schaeffer et al.
patent: 3799234 (1974-03-01), Skidmore
patent: 3992500 (1976-11-01), Kruder et al.
patent: 4060226 (1977-11-01), Schweller
patent: 4110844 (1978-08-01), Nakamura
patent: 4197268 (1980-04-01), Anders
patent: 4247519 (1981-01-01), Sano
patent: 4708620 (1987-11-01), Brugger
patent: 4776784 (1988-10-01), Batiuk
patent: 4802267 (1989-02-01), Hosoya

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