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R. Eckhart, M. Donoser and W. Bauer. Single fibre flexibility measurement in a flow cell based device. In Advances in Pulp and Paper Research, Oxford 2009, Trans. of the XIVth Fund. Res. Symp. Oxford, 2009, (S.J. I’Anson, ed.), pp 247–271, FRC, Manchester, 2018.


Single fibre flexibility is widely recognised as an important parameter in the papermaking process. A novel flow cell based method for its measurement was developed at the Institute for Paper, Pulp and Fibre Technology at Graz University of Technology. A special flow channel geometry is used to induce high shear forces in a laminar flow regime. The movement of single fibres passing the highly sheared region is recorded by means of a high speed image acquisition system. Based on the reactions of the fibres to the fluid forces a flexibility parameter is determined for each evaluated fibre.

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