The Use of PIT Apertures as Windows To Measure Microfibril Angle in Chemical Pulp Fibers

L. A. Donaldson


A technique for measuring microfibril angle in chemical pulp fibers using polarized light is described. Pit apertures are used as windows so that measurements can be made on single cell walls behind the pit in the absence of pit membranes. Typical data are presented using two neutral sulphite anthraquinone pulps as examples. Problems in data analysis are discussed with respect to sample size and heterogeneity of the pulp. The technique can be used on unrefined softwood chemical pulp fibers.


Chemical pulp fibers;pit apertures;polarized light microscopy

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