System for measuring the relaxed length of a moving web

Details System for measuring the relaxed length of a moving web System for measuring the relaxed length of a moving web

1990-06-13

1991-01-15

Cuchlinski, Jr., William A.

Measuring and testing

Sheet, woven fabric or fiber

364562, 226 28, 226 27, G01B 1104

Patent

active

049844580

ABSTRACT:
A method and apparatus for measuring the relaxed length of a moving web includes forming a plurality of detectable marks along the length of the web at a repeated length interval. First and second detectors positioned along the web path are separated by a known distance S. A first tensioning force is applied to the moving web, and a first tensioned repeat length of the web is measured by detecting a mark moving past the first detector and then detecting the next mark moving past the second detector. The time separating the detections is determined. A second tensioning force of a known proportional relationship with the first tensioning force is applied to the moving web. A second tensioned repeat length is measured. The speed of the moving web is measured, and a relaxed length is calculated from the first tensioned repeat length, the second tensioned repeat length, and the proportional relationship between the first and second tensioning forces.

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