Patents
United States Patent 4329313
Douris , ê et al. May 11, 1982
Apparatus and method for extruding ethylene polymers
Miller , Ê et al. May 11, 1982
Abstract
A novel extruder screw having at least three segments wherein the pitch remains constant in each segment and changes abruptly from one segment to the following segment and wherein the pitch ratio divided by the depth ratio is greater than 2/3.
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