Furnishing autohydrolyzed poplar weakly alkaline P-RC APMP to make lightweight coated base paper, TAPPI Journal February 2022



Application: In the manuscript, poplar woodchips were subjected to autohydrolysis pretreatment with different levels of intensity, and then the autohydrolyzed woodchips were used to make P-RC APMP by partially substituting NaOH with MgO in the HC retention stage. Finally, the obtained P-RC APMP was blended with commercial SBKP to make LWC base paper. The present work investigated the optimum conditions for the autohydrolysis pretreatment, substitution ratio of NaOH by MgO, and adding a proportion of the P-RC APMP in the pulp furnish.

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Author: Bo Zhang, Kaili Wu, Qingxi Hou, Tongbao Jiang, Wenwen Zhang, Kaisheng Luo, and Wei Liu
Furnishing autohydrolyzed poplar weakly alkaline P-RC APMP t
ABSTRACT: This work investigated the effects of autohydrolysis pretreatment severity on poplar (Populus tomentosa Carr.) woodchips used to make a type of high-yield pulp (HYP) known as preconditioning followed by refiner chemical treatment, alkaline peroxide mechanical pulp (P-RC APMP). It also investigated the ratios for partially replacing sodium hydroxide (NaOH) with magnesium oxide (MgO) in the high-consistency (HC) retention stage of the P-RC APMP process on the obtained HYP’s properties. The results show that the pretreatment severity of autohydrolysis at combined hydrolysis factor (CHF) = 10.77 and the 50 wt% ratio for partially substituting NaOH with MgO were the optimum conditions for making light-weight coated (LWC) base paper. Compared to the conventional P-RC APMP, the optimized P-RC APMP had similar bulk and higher tensile, burst, and tear indices, as well as opacity, but a slightly lower ISO brightness. When the optimized P-RC APMP and commercial softwood bleached sulfate pulp (SBKP) were blended to make LWC base paper, the most favorable pulp furnish was comprised of 50% optimized P-RC APMP and 50% commercial SBKP. The obtained LWC base paper handsheet had better bulk, and its other properties could also meet the require-ments of LWC base paper.
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