Screw machine for the continuous degradation of plastics

Details Screw machine for the continuous degradation of plastics Screw machine for the continuous degradation of plastics

1977-07-18

1979-01-30

Taylor, Billy S.

Agitating

Rubber or heavy plastic working

Stirrer is through-pass screw conveyor

366 88, 366134, 366142, 366149, 366323, B29B 110, B01F 708

Patent

active

041369670

ABSTRACT:
An apparatus for hydrolytic degradation of plastics in which plastic material is deposited into a tubular housing via a feed hopper. An elongated screw shaft has a first section in the form of a high pitch screw thread disposed below the feed hopper to receive and advance the material to a second section. The second section of the screw shaft is in the form of a lower pitch thread for compressing the plastic material and transferring it to a longer, third section in the form of kneading discs, from which material passes through an outlet nozzle section to a cyclone separator where trapped gases and liquid may be withdrawn. The tubular housing is vented upstream of the feed hopper and a water inlet pipe is disposed adjacent to the second section of the screw shaft, downstream of the feed hopper. The outlet nozzle section is provided with pressure measuring and regulating means and a liquid level measuring and regulating device.

REFERENCES:
patent: 3183553 (1965-05-01), Slater
patent: 3595533 (1971-07-01), Sutter
patent: 3900547 (1975-08-01), Hunt et al.
patent: 3924840 (1975-12-01), Nelson, Jr.
patent: 4057228 (1977-11-01), Volker et al.

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