Shear stiffness tester

Details Shear stiffness tester Shear stiffness tester

1989-02-06

1990-09-25

Raevis, Robert

Measuring and testing

Specimen stress or strain, or testing by stress or strain...

By loading of specimen

G01N 322

Patent

active

049585223

ABSTRACT:
A method and apparatus for determining structural properties of corrugated paperboard in which a sample 21 is held between two axially aligned jaws 13 and 14. The sample is subjected to a twisting force by rotation of one of the jaws and the force and angle of deflection are measured. This gives a relative determination of the boards structural property and is used to assess damage to the corrugated medium during corrugation and subsequent processing steps such as printing. The determination of shear stiffnes in the machine direction is a more reliable measure of board damage than board thickness.

REFERENCES:
patent: 1559466 (1925-10-01), Schopper
patent: 2044411 (1936-06-01), Vaughan, Jr.
patent: 2765655 (1956-10-01), Scott
patent: 2960863 (1960-11-01), Weiss
patent: 3122915 (1964-03-01), Haller
patent: 3675475 (1972-07-01), Weinstein

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