Effect of bleaching procedure type on the aging resistance of chemical-mechanical pulp
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2016-01-01
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Abstract
Chemical-mechanical pulping methods are for producing pulp from high-yield fiber materials derived from poplar wood. The samples are subjected to a single-stage bleaching with H2O2 and a two-stage procedure combining the effect of H2O2 and Rongalyt C. A kinetic investigation of the bleaching pretreatment effect on the thermal ageing of chemical-mechanical pulp is presented. Comparative investigations are carried out with pulp chips which were not subjected to preliminary bleaching. The brightness reversion is followed within the interval from 6 to 48 hours at constant temperature. The ageing process is described by an exponential kinetic equation. The initial and the current rates of the process are determined. It is found that they decrease with increase of the extent of the process proceeding. Microscopic images of the samples are taken after preparation, bleaching and ageing, correspondingly.