Throughput Control

Gravimetric control is a common technology used in extrusion to measure throughput and to keep it constant. With a weighing unit placed on the inlet of the extruder the amount of material passing through per unit time is measured by the loss-in-weight principle. A special controller is responsible for the refilling of the weighing unit and for deriving the throughput value. Beyond that, control takes care for constant throughput of the extruder by adjusting screw speed.

An Animation demonstrates the course of measured and derived signals with reference to the processing sequence.

Throughput control with 950 Gravimetric by adjusting extruder speed.