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Good impregnation of chips prior to cooking results in homogeneous delignification of the chips, i.e. there is no lignin gradient through the chip in the thickness direction. Consequently the carbohydrate reactions (alkaline hydrolysis and peeling) are homogeneous as well through the chip, i.e. the molecular weight is similar and the chemical composition is simliar in all parts of the chips. This will lead to a higher yield.
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This page is a summary of: Increasing pulp yield in kraft cooking of softwoods by high initial effective alkali concentration (HIEAC) during impregnation leading to decreasing secondary peeling of cellulose, Holzforschung, October 2018, De Gruyter,
DOI: 10.1515/hf-2018-0011.
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