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US 4,183,673 AGranted
Marbleization of plastic materials
AssigneeThe Gillette Company
InventorsWiley L. Easley, Richard J. Hoeske, Silvio Petrucci
Life of this patent
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Abstract
Methods and apparatus for marbleizing molded parts produced by screw extruder machines. Liquid colorant is advantageously injected at a comparatively high pressure into a melt containing portion of the machine between the screw and its housing, where the melt is either completely molten or more than fifty percent molten.
Claims10
Apparatus for marbleizing molded parts comprising
- a housing;
- a rotatable injection screw within said housing;
- said injection screw having a feed section, a transition section with a root diameter that increases from said feed section, and a metering section;
- means for applying plastic material to said feed section for conveyance in the direction of screw rotation towards the transition section which provides an increase in pressure and converts substantially the entire feed to molten condition in said metering section;
- means for injecting colorant liquid into the melt where said screw contains only a primary flight;
- means for directly coupling a mold to the output of said metering section which develops an increased level of pressure for the direct injection of molten plastic material with unmixed colorant into said mold;
- and
- means for maintaining the fluidity of said melt.
5 more elements
Dependencies are inferred from the claim text.