Three-Dimensional Analysis of the Collapse Behavior of Kraft-Cooked Norway Spruce Fibers

Stig L. Bardage, Geoffrey Daniel, Adya Singh


Computerized reconstruction and measurement of cross-sectional compactness were used to analyze the collapse behavior of fibers in a kraft-cooked fiber bundle containing early- and transition wood fibers. The results show that the collapse behavior of delignified fibers may be determined by fiber structure and dimensions, and how these are affected by the action of external forces. Nevertheless, some deformation may also arise from internal stresses during drying. Cross-sectional compactness was shown to correlate with the collapse resistance of fiber walls. Results show that the collapse behavior of thin-walled fibers with similar cross-sectional compactness values may vary greatly along the fiber axis. Cross-sectional compactness was relatively higher and constant along the fiber axis for fibers with thick cell walls. Fibers with thin cell walls showed lower values of cross-sectional compactness, which seem to decrease towards the middle of the fiber. Cross-sectional compactness seems to increase towards the fiber tips. Fiber ends may become flattened after delignification independently of high values of cross-sectional compactness. Computerized 3D reconstruction techniques may be a valuable tool in understanding the collapse behavior of pulp fibers.


Picea abies;3D;reconstruction;kraft;fibers;collapse;cross-sectional compactness

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