Degassing extruder

Details Degassing extruder Degassing extruder

1989-12-08

1990-07-10

Simone, Timothy F.

Agitating

Rubber or heavy plastic working

With specified vent means

366 82, 366 85, 366 90, 425204, 425208, B29B 110

Patent

active

049403290

ABSTRACT:
An extruder for degassing a thermoplastic plastics material melt comprises at least one screw mounted for rotation in a barrel. The barrel includes a first feed aperture for the introduction of the melt and a degassing port downstream thereof connectable to means for degassing the melt. The at least one screw is mounted on a shaft and has a helical flight. In the region of the port, the flight is replaced by alternating disc members and spacer members mounted on the shaft. The diameter or major dimension of the disc members corresponds substantially to the combined diameter of the screw core and its flight whilst the diameter of the spacer members corresponds to that of the screw core. The disc members have profiled downstream faces and the thickness of each disc member and each spacer member lies in the range of 0.1 to 0.5 times the diameter of the screw.

REFERENCES:
patent: 3608868 (1971-09-01), Koch
patent: 3779522 (1973-12-01), Loomans
patent: 4347003 (1982-08-01), Anders
patent: 4423960 (1984-01-01), Anders
patent: 4679498 (1987-07-01), Chaveron et al.
patent: 4752135 (1988-06-01), Loomans
patent: 4875847 (1989-10-01), Wenger et al.

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