Injection molding apparatus for producing articles with a mottle

Details Injection molding apparatus for producing articles with a mottle Injection molding apparatus for producing articles with a mottle

1973-07-25

1976-03-23

Husar, Francis S.

Plastic article or earthenware shaping or treating: apparatus

With separate and distinct upstream agitating or kneading means

Within pressurizing chamber

425242R, B29F 104

Patent

active

039457869

ABSTRACT:
A molding system for producing articles of mottled appearance includes a plasticizing unit having an inner bore which communicates with a mold cavity. A feed screw is mounted within the bore and is connected to fluid-actuated motors for rotary and translational movement within the bore. A spreader device is positioned in a heated part of the bore ahead of the feed screw. The screw is rotated to feed and soften molding materials of diverse coloration and is subsequently translated to push the materials through the spreader device such that final plasticization occurs. A bridging conduit is provided between the rotary and translational motors to divert a controlled amount of fluid from the latter to the former during a pushing operation, to rotate the screw forwardly at a controlled rate or to hold pressure on the screw to prevent backward rotation or to limit the amount of backward rotation.

REFERENCES:
patent: 2740160 (1956-04-01), McKee et al.
patent: 2892214 (1959-06-01), McCarthy
patent: 3130452 (1964-04-01), Heumann
patent: 3156013 (1964-11-01), Elphee
patent: 3169275 (1965-02-01), Compton et al.
patent: 3510915 (1970-05-01), Johansson
patent: 3729280 (1973-04-01), Hehl
patent: 3752363 (1973-08-01), Fegley et al.
patent: 3807925 (1974-04-01), Lohmann
patent: 3810728 (1974-05-01), Jacobs
patent: 3846057 (1974-11-01), Counceller et al.

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