Journal of Materials Science

, Volume 43, Issue 22, pp 7210–7218 | Cite as

Wet fiber shear flexibility and its contribution to the overall transverse deformation of fibers

  • Dongbo YanEmail author
  • Kecheng Li


A new method has been developed for measuring not only bending but also shear flexibility of pulp fibers by using confocal laser scanning microscopy. Based on the Steadman and Luner method, a two-stage wet pressing process was used which enabled both bending and shear flexibility and both bending and shear modulii of fibers to be determined with a single test. Three types of fibers, i.e., bleached spruce Kraft Pulp (BKP), aspen bleached chemi-themomechanical pulp (BCTMP), and aspen themomechanical pulp (CTMP), were tested. Results show that the longitudinal elastic modulii of the fibers are in a range of 3–37 GPa, and the transverse shear modulii of them are in a range of 27–103 MPa. It was also found that the shear contribution to the overall fiber deformation ranged from 60% to 90% for the fibers measured. This substantiates the concept of shear contribution to measured fiber flexibility as proposed by Waterhouse and Page.


Confocal Laser Scanning Microscopy Span Length Pulp Fiber Fiber Wall Confocal Laser Scanning Microscopy Image 



The author would like to acknowledge the financial support of AIF, CFI, and NBIF to this research.


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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  1. 1.Department of Chemical Engineering and Limerick Pulp and Paper Research and Education CentreUniversity of New BrunswickFrederictonCanada

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