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United States Patent 3954366
Douris , ê et al. May 4, 1976

Two-stage single screw extrusion apparatus

Fields May 4, 1976

Abstract

A two-stage single screw apparatus and process for the extrusion of plastic resins, the first stage positively advancing the resinous material while in a highly viscous state with minimum blow-back and the second stage, through the use of a screw having multiple lead threads with a high pitch adapted to allow substantial blow-back to provide mixing and ultimate discharge of the resin through die means, providing precise metering and discharge of the molten resin through the die over a wide variation of die pressures.