Shear stiffness tester

Details Shear stiffness tester Shear stiffness tester

G - Physics

01

N

73/77

G01N 3/26 (2006.01) G01N 33/34 (2006.01) G01N 3/00 (2006.01) G01N 3/02 (2006.01)

Patent

CA 1322469

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 stiffness in the machine direction is a more reliable measure of board damage than board thickness.

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