| 摘要 |
The apparatus for extrusion of a thermoplastic material comprises an extruder with an extruder screw and an extruder housing with a feed opening, a feed device, a drive with a variable speed motor and a regulating device cascade for the mass temperature. The regulating device cascade has a plurality of tempering zones, at least one mass temperature detector and at least one tempering device. One tempering zone connected directly to the feed opening is part of the regulating device cascade and the temperature in the one tempering zone is corrected by a set value during a mass temperature variation. To provide a temperature regulation range which does not experience disturbing decreases, the tempering zone at the feed opening has only a cooling device and has a grooved sleeve. The feed device is a gravity feed device and belongs to an additional regulating loop which controls the rotational speed of a variable speed motor. When an excessive value of the mass temperature and throughput occurs, the regulating loop to which the gravity feed device belongs causes the drive speed of the variable speed motor to be reduced; an insufficient value gives rise to an increased motor speed. The regulating device cascade and the additional regulating loop are connected by a logic unit, advantageously a computer, which compensates for variations. |
