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A test method for simultaneous contactless measurement of lateral contraction and change in thickness of paper in tensile testing is presented. All the investigated paper samples showed transverse shrinkage as well as an increase in thickness during loading. Consequently, in-plane Poisson’s ratios for different tested papers were positive, whereas Poisson’s ratios in thickness direction had negative values. In general, the transverse shrinkage proved to be detectable while the resolution and accuracy of the thickness determination in some cases still requires optimization.

Optical measurement of deformation of paper under tensile load