The Chalmers Dynamic Stiffness Tester (DST) measures the torsional stiffness of corrugated board by determining the natural angular frequency of a sample when it is rotated with an inertial mass attached to it. This frequency is directly proportional to torsional stiffness.
Dynamic Stiffness Testing (DST) measures how well the corrugated board has been made and how much flute damage is received during the printing and converting processes.
Corrugated boards are engineered structures made up of flutes and liners. The flutes are the bracing elements in the structure that keep the liners apart and from moving relative to each other, so a corrugated carton can resist buckling and compression forces. If the flutes are well made and not crushed, then the performance property of the board will be maximized.
Edge Crush Testing (ECT) is a common test that tells you how strong a corrugated board is. Whereas Dynamic Stiffness Testing (DST) shows you the degradation of a corrugated sheet, essentially showing how weak it is.