Method and apparatus for testing of shear stiffness in board

摘要

A method and apparatus are described for testing the torsional stiffness of corrugated paper board. The method includes holding a sample 6 at one part and attaching an inertial mass 7 to another part. The inertial mass 7 is rotated and allowed to freely oscillate. The time period for the oscillation(s) is measured. An indication of the stiffness of the sample is obtained by reference to the time period. The apparatus includes means for holding the sample 6 so that one part of the sample carrying an inertial mass 7 may be rotated relative to another part of the sample and allowed to oscillate, a detector 8 for detecting when the inertial mass 7 passes through a zero angle region, and electronic processing means to obtain an indication of the shear stiffness of the sample.