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AssigneeKraussMaffei Technologies GmbH
InventorsReinhard Schiffers, Stefan Kruppa, Stefan Moser, Matthias Busl, Johannes Wortberg
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In a method for operating an injection moulding machine in the absence of a backflow barrier, plastic melt is injected by a plasticising device into a cavity in a screw antechamber of a plasticising screw adapted to rotate about a longitudinal axis and to move translationally by a drive unit during an injection phase and a holding-pressure phase. A rotational drive of the drive unit is controlled such that a speed of the plasticising screw causes overlay of a backflow of the plastic melt from the screw antechamber back into screw threads of the plasticising screw by an opposing delivery flow as a result of a rotation of the plasticising screw due to a translational injection movement of the plasticising screw. A differential flow is established from the backflow and the opposing delivery flow and influenced at least during the injection phase by influencing the speed of the plasticising screw.
A method for operating an injection moulding machine, said method being executed in the absence of a backflow barrier and comprising:
Dependencies are inferred from the claim text.