Vent-type injection molding machine

Details Vent-type injection molding machine Vent-type injection molding machine

1993-09-13

1995-01-31

Mackey, James P.

Plastic article or earthenware shaping or treating: apparatus

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

366 75, 425203, 425812, 425815, B29C 4563

Patent

active

053854624

ABSTRACT:
A vent hole 3 for exhausting a gas component generated from a melted resin is provided at a heating cylinder. A gas staying chamber is formed at the interior by covering the upper portion of the vent hole, and there are provided a vent hole cover having a gas exhaust port at its upper portion and an inert gas supply unit for supplying an inert gas to the inside of the vent hole cover. Thereby the inert gas stays in the gas staying chamber, and a gas shielding layer for shielding the vent hole from the atmospheric air is formed.

REFERENCES:
patent: 3879155 (1975-04-01), Hendry
patent: 4060226 (1977-11-01), Schweller
patent: 4112519 (1978-09-01), Kruder
patent: 4247519 (1981-01-01), Sano
patent: 4392804 (1983-07-01), Pushee et al.
patent: 4767303 (1988-08-01), Sakakura et al.
patent: 4820463 (1989-04-01), Raufast
patent: 4959186 (1990-09-01), Dollhopf et al.

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