Patents
United States Patent 4247501
Douris , ê et al. January 27, 1981
Marbleization of plastic materials
Easley , Ê et al. January 27, 1981
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.
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