Two-stage single screw extrusion apparatus

Details Two-stage single screw extrusion apparatus Two-stage single screw extrusion apparatus

1975-01-06

1976-05-04

Lazarus, Richard B.

Plastic article or earthenware shaping or treating: apparatus

With separate and distinct upstream agitating or kneading means

Within pressurizing chamber

425209, 425378R, B29F 302

Patent

active

039543668

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.

REFERENCES:
patent: 3035306 (1962-05-01), Rossiter
patent: 3559240 (1971-02-01), Kosinsky
patent: 3632255 (1972-01-01), Geyer
patent: 3826477 (1974-07-01), Kunogi
patent: 3867079 (1975-02-01), Kim

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