Vent type injection molding machines

Details Vent type injection molding machines Vent type injection molding machines

1987-08-20

1989-04-18

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

With separate and distinct upstream agitating or kneading means

With separate and distinct gas withdrawal chamber

264102, 366 75, 366 77, 366139, 425567, 425568, 425570, 425812, B29C 4522, B29C 4534

Patent

active

048222690

ABSTRACT:
In a vent type injection molding machine of the type comprising a heating cylinder, injection nozzle means having a vent port and connected to the front end of the heating cylinder and a reciprocatable screw for metering a predetermined quantity of resin to be injected, the injection nozzle means comprises a first injection nozzle connected to the heating cylinder, a second injection nozzle coaxial with the first injection nozzle, a spring for urging the second injection nozzle against a stationary metal mold and a housing surrounding the first and second injection nozzles. The vent port is provided through the housing at a point communicating with a space in the housing between the first and second injection nozzles. The operation of the injection molding machine is controlled by a method comprising the steps of metering a predetermined quantity of molten resin to be injected by advancing the screw, closing the vent port and the injection nozzle means, retracting the screw thus forming a space in the injection nozzle means, and discharging the gases of volatile substances and moisture contained in the molten resin.

REFERENCES:
patent: 3295169 (1967-01-01), Moslo
patent: 4299791 (1981-11-01), Aoki

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