Method and device for reducing variations in the ejection of a plastic melt

A method for reducing fluctuations over time in discharge of a plastics composition when extruding plastics products, comprising:

• melting plastics material in an extruder and supplying the plastics material to an extrusion die by way of one or more extruder screws arranged in the extruder;
• and
• conveying a plastics composition along an extrusion axis by rotating the one or more extruder screws as pressure builds up;
• and
• changing a rotational speed of the one or more extruder screws to keep constant a discharge of the plastics material at a transition region from the extruder to the extrusion die or in the extrusion die,
• wherein changing the rotational speed of the one or more extruder screws comprises increasing and then decreasing, or vice versa, the rotational speed of the one or more extruder screws,
• wherein the changing of the rotational speed is carried out within one revolution of the one or more extruder screws,
• wherein a magnitude of a rotational-speed change associated with the changing of the one or more extruder screws is established on the basis of a mathematical model,
• wherein the changing of the rotational speed of the one or more extruder screws is configured to occur when the one or more extruder screws are at a plurality of rotational angles, and
• wherein the plurality of rotational angles are within a range, the range being determined using available measurement data on a composition pressure of the plastics composition.