US 12,486,135 B2
System and methods for the calculation of additional local stretching in a web
Fabrizio Bartolini, Lucca (IT); and Marco Capitani, Lucca (IT)
Assigned to VALMET AB, Sundsvall (SE)
Appl. No. 18/291,708
Filed by VALMET AB, Sundsvall (SE)
PCT Filed Aug. 23, 2022, PCT No. PCT/EP2022/073372
§ 371(c)(1), (2) Date Jan. 24, 2024,
PCT Pub. No. WO2023/025743, PCT Pub. Date Mar. 2, 2023.
Claims priority of application No. 2151019-3 (SE), filed on Aug. 24, 2021.
Prior Publication US 2025/0066153 A1, Feb. 27, 2025
Int. Cl. B65H 26/06 (2006.01); B65H 26/02 (2006.01); G01N 21/88 (2006.01); G01N 21/89 (2006.01)
CPC B65H 26/066 (2013.01) [B65H 26/02 (2013.01); G01N 21/8851 (2013.01); G01N 21/8901 (2013.01); G01N 21/8914 (2013.01); B65H 2220/01 (2013.01); B65H 2301/4143 (2013.01); B65H 2301/542 (2013.01); B65H 2408/23 (2013.01); B65H 2511/17 (2013.01); B65H 2511/24 (2013.01); B65H 2553/45 (2013.01); B65H 2553/51 (2013.01); B65H 2557/62 (2013.01); B65H 2801/84 (2013.01); G01N 2021/8861 (2013.01); G01N 2021/888 (2013.01); G01N 2021/8917 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for calculating the additional local stretching of a moving web through a converting process comprises the following steps:
providing a moving web (3) of material,
providing a control system (19, 19′),
marking the moving web with a plurality of coded position markers at predetermined intervals while winding the web on a reel (11),
rewinding the web from the reel, detecting coded position markers and measuring the distance between pairs of coded position markers, and
using the control system (19, 19′), within a time period equal to or less than one second after measuring the distance between said at least one pair of coded position markers, to divide the measured distance between each of said pairs of coded position markers by the predetermined distance between each of said pairs of coded position markers to calculate in real-time the additional local stretching of the web between each said pair of consecutive coded position markers.