Bernhard Schaefer from Mahwah, NJ

Method And Device For Regulating Pressure In A Single-Screw Degassing Extruder Or In A Cascade Extruder
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US Patent:

20060285426, Dec 21, 2006
Filed:

Sep 30, 2005
Appl. No.:

11/239016
Inventors:

Bernhard Schaefer - Mahwah NJ, US
Michael Meier-Kaiser - Alsbach-Haehnlein, DE
Assignee:

ROEHM GMBH & CO. KG - Darmstadt
International Classification:

B29B 7/72
US Classification:

366077000, 366079000, 366100000
Abstract:

The invention relates to a method for regulating the minimal value of the pressure in the first half of the metering zone in a direction of conveyance in a single-screw degassing extruder or in a cascade extruder during the conveying of a melt consisting of a thermoplastic. The single-screw degassing extruder or the cascade extruder each have a first screw section (), a degassing zone (), a metering zone (), and a measuring control loop (M), which includes a pressure measuring sensor (P) in the first half of the metering zone, a regulator (R) and an actuator (S) for influencing the pressure in the metering zone. The pressure is measured by the pressure measuring sensor (P) and is set by the regulator (R) and the actuator (S) so that the minimal value at the location of measurement ranges from 0.1 to 10 bar.