Method for determining sagging of melt of a tube extruded in an extrusion device
AssigneeSikora AG
InventorHarald Sikora
Life of this patent
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Abstract
A method for determining sagging of melt of a tube extruded in an extrusion device includes structuring a measuring device to rotate about the tube. The measuring device is configured to measure a wall thickness of the tube over a circumference of the tube and determine a wall-thickness profile over the circumference of the tube from the measured wall thicknesses. The wall-thickness profile includes a frequency and an amplitude. The method further includes determining a sagging of the melt from at least one of (i) the frequency and (ii) the amplitude of the wall-thickness profile.
Claims13
A method for determining sagging of melt of a tube extruded in an extrusion process, comprising:
- measuring a wall thickness of the tube over a circumference of the tube;
- determining a wall-thickness profile over the circumference of the tube from the measured wall thicknesses, wherein the wall-thickness profile includes a frequency;
- comparing the wall-thickness profile with a reference wall-thickness profile;
- determining the sagging of the melt from a change in the frequency between the reference wall-thickness profile and the determined wall-thickness profile;
- and
- applying a change to at least one control parameter of the extrusion process based on the determined sagging of the melt to control the sagging of the melt.
Dependencies are inferred from the claim text.