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Title
Influence of xylanase pretreatment on refining energy and brightness of P-RC APMP pulp of Italian black poplar branches
Authors
J. C. CHEN G. H. YANG F. G. KONG L. A. LUCIA and Y. LIU
Received
November 21, 2011
Published
Volume 46, Issue 3-4 March-April
Keywords
Italian black poplar branches, xylanase, pretreatment, P-RC APMP pulp, refining energy
Abstract
The study evaluates the influence of commercial xylanase (AU-PE89 and 51024) pretreatment applied in different refining stages of pulping on refining energy and properties of P-RC APMP pulp of Italian black poplar branches. Compared to the non-pretreated P-RC APMP pulp, the refining energy consumption of the pulps pretreated by xylanase before the second and third refining stages, performed during P-RC APMP pulping, decreased by 8-17% and 9-21%, respectively, while the brightness value of the pretreated pulp improved by 1.0-2.3 and 0.9-1.2% ISO, respectively, with minor changes in pulp strength properties. The pretreated pulp had longer fiber length, a higher fiber torsion index, smaller fiber width and a higher degree of cellulose crystallinity. The effect of xylanase pretreatment before the third refining stage was better, compared to the one applied before the second stage, as to refining energy saving, while the effect of xylanase AU-PE89 pretreatment was better than that of xylanase 51024.
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