Weight per length control
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Process |
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Instrument |
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Principle |
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 this, the control takes care of constant throughput of the extruder by adjusting screw speed. Besides extruder throughput control, control of weight-per-unit length is very common in profile and pipe extrusion by adjusting the haul-off speed. Weight-per-length control can be achieved either by controlling the haul-off or the extruder speed. Accordingly the other drive is set manually.  |
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