Processing and structure of paperboard with a needled middle layer
Journal article, 2019

The possibility to change the fibre network structure of paperboard by using the needle punching method was studied. Needling was performed on the middle layer made from unbleached softwood kraft pulp at a dry content of 20%. The needled structure was studied by several microscopy methods, which showed that the fibres were redistributed mainly in-plane. Denser regions of the fibre network structure were observed close to the needle penetration sites. The local density was estimated to be 25% higher than that of the surrounding unaffected structure.

Fibre orientation

Network structure

Wood cellulose fibre


Needle punching


Maria Klingberg

Chalmers, Industrial and Materials Science, Materials and manufacture

Antal Boldizar

Chalmers, Industrial and Materials Science, Engineering Materials

Karin Hofer

Technische Universität Graz

Cellulose Chemistry and Technology

0576-9787 (ISSN)

Vol. 53 3-4 315-323

Subject Categories

Inorganic Chemistry

Paper, Pulp and Fiber Technology

Geosciences, Multidisciplinary

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