Method of injecting molding

Details Method of injecting molding Method of injecting molding

1990-07-16

1992-05-19

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

With internal application of fluid pressure

2643288, 26432812, 26432813, B29C 4500, B29D 2200

Patent

active

051146606

ABSTRACT:
A method and system for the injection molding of plastic articles in an injection molding system including a pneumatically operated gas compression unit having a high pressure gas receiver. The injection molding system includes a resin injection nozzle and a mold having an injection aperture and mold cavity for receiving molten resin from the nozzle. The gas compression unit includes a gas booster which pressurizes a first charge of gas to the pressure setting of a pressure switch. The gas receiver stores the first charge of pressurized gas at a pressure level within a predetermined range of pressures. At least one fluid pressure reducing valve reduces the pressure of the gas as it is communicated from the fluid receiver to an orifice in the mold to an acceptable level for molding the article. The gas compression unit is capable of servicing a plurality of injection molding machines and corresponding molds when a like plurality of pressure reducing valves are provided.

REFERENCES:
patent: 4101617 (1978-07-01), Friederich
patent: 4855094 (1989-08-01), Hendry
patent: 4935191 (1990-06-01), Baxi
patent: 4948547 (1990-08-01), Hendry
patent: 5039463 (1991-08-01), Loren

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