Control method for injection moulding
AssigneeTetra Laval Holdings & Finance S.A.
InventorPeter Lindberg
Life of this patent
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Abstract
A control method for an injection moulding system having an extruder, feeding material continuously to an accumulator, portioning material intermittently to an injection device, wherein the control method is configured to drive the extruder at a high speed or at a low speed respectively, the high speed and the low speed defining an extruder speed interval, the method comprising acquiring a value for an actual positional change for the accumulator (ΔPOSACT), comparing the value for the actual positional change (ΔPOSACT) with a predicted value for the positional change (ΔPOSPRED), and adjusting a speed of the extruder based on a result of the comparison.
Claims9
A method for controlling a speed of an extruder in an injection moulding system the method consisting of:
- feeding material continuously to an accumulator via the extruder, the extruder being driven at a first speed or at a second speed, wherein the second speed is greater than the first speed, and the first speed and the second speed define an extruder speed interval;
- acquiring an actual positional change for the accumulator;
- comparing the actual positional change with a predicted positional change;
- and
- adjusting a speed of the extruder based on the comparison by shifting the first speed or the second speed by an increment to generate a new first speed or a new second speed of the extruder.
Dependencies are inferred from the claim text.