Method and device for controlling a thickness profile of a film web

Patent metadata

Field	Value
Publication number	US-11964419-B2
Application number	US-201917291638-A
Country	US
Kind code	B2
Filing date	Nov 5, 2019
Priority date	Nov 6, 2018
Publication date	Apr 23, 2024
Grant date	Apr 23, 2024

Abstract

The invention relates to a method for controlling a thickness profile (DP) of a film track (FB) along a transverse direction (QR) by means of a plurality of adjusting means (120) for adjusting a slot opening (112) of a discharge nozzle (110) of the flat film machine (100), comprising the following steps:acquiring a thickness profile (DP) along the transverse direction (QR) of the film track (FB) transverse to a production direction (PR) of the flat film machine (100),comparing at least a partial section of the acquired thickness profile (DP) with a preset profile (VP),determining at least one local profile deviation (PA) in a deviation section (AA) as a result of the comparison,generating at least one controlling intervention for the adjustment of at least one adjusting means (120) in an intervention section (EA) different from the deviation section (AA).

First claim

The invention claimed is:

1. A method for controlling a thickness profile of a film track along a transverse direction by a plurality of adjusting actuators for adjusting a slot opening of a discharge nozzle of the flat film machine, comprising:
acquiring a thickness profile along the transverse direction of the film track transverse to a production direction of the flat film machine,
comparing at least a partial section of the acquired thickness profile with a preset profile,
determining at least one local profile deviation in a deviation section as a result of the comparison,
using a controlling device for generating at least one controlling intervention for the adjustment of at least one of the plurality of adjusting actuators in an intervention section different from the deviation section;
wherein the controlling device takes into account a temporally preceding controlling intervention when generating the controlling intervention.

2. The method according to claim 1 , wherein the intervention section comprises a different extension along the transverse direction than the deviation section.

3. The method according to claim 1 , wherein at least two adjusting actuators are adjusted by the controlling intervention in the intervention section.

4. The method according to claim 1 , wherein the intervention section overlaps with the deviation section in the transverse direction of the film track.

5. The method according to claim 1 , wherein the intervention section is directly or substantially directly adjacent to the deviation section in the transverse direction of the film track.

6. The method according to claim 1 , wherein the intervention section is spaced apart from the deviation section in the transverse direction of the falx track.

7. The method according to claim 1 , wherein a group of at least two adjacent adjusting actuators are adjusted in the intervention section by the controlling intervention.

8. The method according to claim 1 , wherein the controlling intervention acts on at least two intervention sections on different sides of the deviation section in the transverse direction or the controlling intervention acts on a common intervention section between two deviation sections in the transverse direction.

9. The method according to claim 8 , wherein at least the controlling intervention or the at least two intervention sections are formed symmetrically or substantially symmetrically in the transverse direction to the deviation section or the two deviation sections are formed symmetrically about the one common intervention section.

10. The method according to claim 1 , wherein the deviation section remains free of its own controlling intervention.

11. The method according to claim 1 , wherein the deviation section comptises its own controlling intervention.

12. The method according to claim 1 , wherein at least two controlling interventions are carried out at two different intervention sections in parallel or at least overlapping in time.

13. The method according to claim 1 , wherein the necessary controlling interventions are prioritized in the case of at least two specific. local profile deviations.

14. The method according to claim 1 , wherein a temporally preceding controlling intervention is taken into account when generating the controlling intervention.

15. The method according to claim 1 , wherein the time evolution of the thickness profile is taken into account when generating the controlling intervention.

16. The method according to claim 1 , wherein the time required for the adjustment of the adjusting actuators is taken into account when generating the controlling intervention.

17. The method according to claim 1 , wherein the controlling device is configured to consider the time required for the adjustment of at least one of the plurality of adjusting actuators, when generating the controlling intervention.

Assignees

• Windmoeller & Hoelscher

Inventors

• Colell Waldemar
• Groepper Bernd-Alexander
• Schmitz Torsten

Classifications

• B29C48/92 Primary

  Measuring, controlling or regulating · CPC title

• B29C48/08 Primary

  flexible, e.g. films · CPC title

• B29C2948/92647

  Thickness · CPC title

• B29C2948/92904

  Die; Nozzle zone · CPC title

• B29L2007/008

  Wide strips, e.g. films, webs · CPC title