Mechanical properties of paperboard with a needled middle layer
Journal article, 2018

Needling of formed kraft pulp at a dry content of 20 % was previously shown to result in a redistribution of the fibres in the plane, resulting in local regions with a higher fibre structure density. The bending properties of a three-ply paperboard with a needled middle layer have here been studied, and it is shown that a needled middle layer can increase the bending resistance of a layered board by 8 % and that the peak bending angle can be increased by up to 20 %, although the bending stiffness may not be changed significantly. The needled middle layers had a higher compressive stiffness in the out-of-plane direction, but the effect of the needling on the tensile strength in the out-of-plane direction was insignificant.

fibre network structure

folding

paperboard

needle punching

bending properties

Author

Maria Klingberg

Chalmers, Industrial and Materials Science, Engineering Materials

Antal Boldizar

Chalmers, Industrial and Materials Science, Engineering Materials

Karin Hofer

Technische Universität Graz

Cellulose Chemistry and Technology

0576-9787 (ISSN)

Vol. 52 89-97

Subject Categories

Wood Science

Paper, Pulp and Fiber Technology

Organic Chemistry