Process for monitoring a screw or worm extruder, particularly a

Details Process for monitoring a screw or worm extruder, particularly a Process for monitoring a screw or worm extruder, particularly a

1986-12-22

1988-07-26

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

264 401, 264 407, 425136, 425145, 425149, 425154, B29B 772, B29C 4792

Patent

active

047598905

ABSTRACT:
In operation of a screw extruder, particularly a pin extruder, processing a rubber or a plastic mixture, troubling disturbances and on occasion heavy damage occur when foreign bodies are introduced into the extruder with the material to be processed causing damage to the extruder structure. In order to avoid this damage one possibility is to shut off the extruder at a sufficiently early time and of course immediately when an appropriate dangerous condition is detected. Therefore the drive torque which is taken by the extruder screw shaft is compared with the mass pressure in the mixture to be processed. As soon as this compared value no longer follows the functional dependence of the normal operating parameters such as the rotation speed of the extruder shaft, viscosity of the mixture, temperature lowering of the tempering medium, the volume increase of the mixture drawn in the extruder inlet or the like, the extruder is automatically shut off since a disturbance by foreign bodies is assumed. For determination of the torque a torque measuring shaft is used or a measured quantity proportional to it referred to. The mass pressure can be measured in the material to be processed by a mass pressure sensor in a pin of a pin cylinder in the extruder.

REFERENCES:
patent: 3704972 (1972-12-01), Kneller et al.
patent: 3728056 (1973-04-01), Theysohn
patent: 3733059 (1973-05-01), Pettit
patent: 3799719 (1974-03-01), Bonikowski et al.
patent: 4470937 (1984-09-01), Sugimoto et al.
patent: 4508454 (1985-04-01), Anders
patent: 4510104 (1985-04-01), Weaver et al.
patent: 4550002 (1985-10-01), Uhland et al.
patent: 4671908 (1987-06-01), Gwinn et al.
Druck-und Temperaturmessungen an einem Einschnecken-Extruder beim Verarbeiten von Polyathylen weich by Prof. Dr. Ing. Georg Menges and Dipl.-Ing. Jens Muller, Aachen, pp. 631-643.
Betriebsverhalten einer Rohrextrusionsanlage by Dr.-Ing. W. Bauer, Ludwigshafen, pp. 157-162.

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