Method and apparatus for determining web tension setting

Details Method and apparatus for determining web tension setting Method and apparatus for determining web tension setting

1989-03-06

1990-08-14

Raevis, Robert

Measuring and testing

Sheet, woven fabric or fiber

G01L 504

Patent

active

049476866

ABSTRACT:
An apparatus for use in determining the approximate web tension setting necessary for providing a predetermined web width in a machine, such as a web printer, which is used to process a continuous plastic web of the type which is subject to significant stretching and shrinking in response to relatively small web tension variations, comprising a first web restraining device for holdingly engaging a first end of a length of web material to be tested; a second web restraining device for holdingly engaging a second end of the length of web material to be tested; a force application device for applying a controlled amount of longitudinal stretching force to the length of web material to be tested; and a measuring device for measuring the width of the length of web material to be tested in a mid-region thereof during application of the longitudinal stretching force thereto. The apparatus may also be used for determining web graphics distortion.

REFERENCES:
patent: 1505127 (1924-08-01), Ayres
patent: 2568731 (1951-09-01), Hansen et al.
patent: 4779411 (1988-10-01), Kendall

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