Abstract
Based on the assumption that the most basic property of a paper is its apparent density, pulping effects such as yield, number of fibres per unit weight, lignin and hemicellulose contents and fibre strength are discussed with reference to the formation of bonds and paper structure . Special attention is devoted to the influence of different hinds of sulphite cooking such as conventional acid sulphite, bisulphite and two-stage cooking, also kraft cooking and bleaching. .Finally, non-chemical operations in pulping such as chipping, fibre fractionation and drying are briefly surveyed.
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