Sheet tension sensor

Details Sheet tension sensor Sheet tension sensor

1988-09-21

1991-07-09

Raevis, Robert

Measuring and testing

Sheet, woven fabric or fiber

G01L 504

Patent

active

050294695

ABSTRACT:
A sheet tension measuring device is disclosed for measuring the tension of a moving sheet wherein a moving sheet is accurately positioned with pinchers at 2 spaced locations. The sheet is deflected between these pinchers from its nominal straight line path, and the amount of deflection and deflecting force are measured. The pinchers iron out any wrinkles in the sheet as the moving sheet slides through the pinchers. Sheet tension is computed based upon the measured deflection force and deflection distance. The resulting measurements of local sheet tension are used to correct nondestructive sheet strength measurements. A device and method are also disclosed for nondestructively determining the sheet strength and the extensional stiffness of the sheet in the machine direction and in the cross-direction.

REFERENCES:
patent: 2444245 (1948-06-01), Campbell
patent: 3677076 (1972-07-01), Herzhoff et al.
patent: 3718037 (1973-02-01), Stringer et al.
patent: 4107847 (1978-08-01), Typpo et al.
patent: 4453404 (1984-06-01), Powell et al.
patent: 4587855 (1986-05-01), Yamada et al.

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