DIN 53121 or ISO 5628 | Determination of the Bending Stiffness on Paper

The bending stiffness of paper is tested using the two-point method.
The paper strip is vertically gripped in the test fixture and the specimen is bent. The paper strip is only bent to the extent that no plastic deformation occurs. The bending stiffness is then determined via a sloped line in the elastic range of the measurement curve.

Bending stiffness is of critical importance in the further processing of paper and cardboard. To enable reliable, trouble-free operation of packaging and filling machines, the paper or board must be flexible within defined limits. At paper feed changeover, uniform stiffness properties are also essential for smooth operation of the packaging machine.

ZwickRoell's 2-point flexure test kit covers two applications: measurement of bending stiffness and determination of folding characteristics at a bending angle of 120°. Accurate, high-resolution measuring technology eliminates the need for a change of load cell.