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The aim was to study the effects of various bleaching chemicals on kraft pulp fibers of different cell-wall thickness (i.e. effect of fiber morphology on bleaching). Pulps of varying average cell-wall thickness were obtained by fractionating them using hydrocyclones. After the fractionation, unbleached softwood kraft pulp fractions were treated with oxygen, chlorine dioxide, hydrogen peroxide, and ozone. Kappa reduction in the oxygen stage increased with cell-wall thickness at a given fines content. The consumption of hydrogen peroxide per unit decrease in kappa number increased with cell-wall thickness at the same fines content. The consumption of chlorine dioxide and ozone per brightness unit gained decreased with cell-wall thickness. In addition, the results showed that primary fines adversely affected the hydrogen peroxide bleaching of the pulp.
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Effect of Cell-wall Thickness and Fines on Bleaching, 2002 International Pulp Bleaching Conference P