US 12,083,731 B2
Method for controlling a nozzle slot of a discharge nozzle for a film track of a flat film machine
Torsten Schmitz, Lengerich (DE); Waldemar Colell, Lengerich (DE); and Bernd-Alexander Groepper, Lengerich (DE)
Assigned to Windmöller & Hölscher KG, Lengerich (DE)
Appl. No. 17/287,273
Filed by Windmöller & Hölscher KG, Lengerich (DE)
PCT Filed Nov. 5, 2019, PCT No. PCT/EP2019/080254
§ 371(c)(1), (2) Date Apr. 21, 2021,
PCT Pub. No. WO2020/094647, PCT Pub. Date May 14, 2020.
Claims priority of application No. 10 2018 127 673.7 (DE), filed on Nov. 6, 2018.
Prior Publication US 2021/0394419 A1, Dec. 23, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. B29C 48/92 (2019.01); B29C 48/08 (2019.01); B29C 48/10 (2019.01); B29C 48/31 (2019.01); B29D 7/01 (2006.01)
CPC B29C 48/92 (2019.02) [B29C 48/08 (2019.02); B29C 48/10 (2019.02); B29C 48/31 (2019.02); B29D 7/01 (2013.01); B29C 2948/92647 (2019.02); B29C 2948/92704 (2019.02)] 10 Claims
OG exemplary drawing
 
1. A method for controlling a nozzle slot of a discharge nozzle for a film track of a flat film machine, comprising the following steps, performed repeatedly during production of the film track:
acquiring an actual profile of the nozzle slot,
detecting a thickness profile of the film track,
comparing the detected thickness profile of the film track with a preset profile,
determining a profile deviation as a result of the comparison, and
performing a controlling intervention to change the nozzle slot based on the profile deviation and the actual profile, wherein an effect of the controlling intervention is stored together with the actual profile as a result profile for use as an actual profile for a subsequent controlling intervention.