Plastic and nonmetallic article shaping or treating: processes – Random variegated coloring during molding – By compression in a closed mold cavity
Patent
1976-01-14
1977-08-16
Kucia, Richard R.
Plastic and nonmetallic article shaping or treating: processes
Random variegated coloring during molding
By compression in a closed mold cavity
264245, 264328, 264329, B29F 112
Patent
active
040426602
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: 2271063 (1942-01-01), De Mattia
patent: 2279344 (1942-04-01), Reid
patent: 3130452 (1964-04-01), Heumann
patent: 3146287 (1964-08-01), Albers
patent: 3228997 (1966-01-01), Armstrong
patent: 3807925 (1974-04-01), Lohmann
HPM Corporation
Kucia Richard R.
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