System for injection molding utilizing a pressurizing fluid sour

Details System for injection molding utilizing a pressurizing fluid sour System for injection molding utilizing a pressurizing fluid sour

1992-05-20

1996-05-21

Heitbrink, Tim

Plastic article or earthenware shaping or treating: apparatus

Means feeding fluent stock from plural sources to common...

264572, 425564, B29C 4516

Patent

active

055183867

ABSTRACT:
A method and system for the injection molding of plastic articles in an injection molding system including a chamber in a mold of the system which stores a charge of pressurized gas immediately prior to use. The mold has an injection aperture and a mold cavity for receiving molten resin. A resin flow path fluidly communicates the injection aperture and the mold cavity within the mold. An orifice in the mold opens the chamber to the mold. A gas receiver initially stores the charge of pressurized gas and a fluid circuit selectively introduces the charge of pressurized fluid into the chamber. A valve mechanism in the chamber selectively fluidly communicates the chamber to the flow path under control of a controller. When communicated to the flow path, the charge of gas distributes the molten plastic within the mold cavity in one embodiment of the invention.

REFERENCES:
patent: 4101617 (1978-07-01), Friederich
patent: 4855094 (1989-08-01), Hendry
patent: 4935191 (1990-06-01), Baxi
patent: 4943407 (1990-07-01), Hendry
patent: 4948547 (1990-08-01), Hendry
patent: 5030076 (1991-07-01), Ebenhofer et al.
patent: 5066214 (1991-11-01), Baxi et al.

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