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Chemical pulping: the influence of xylan on the sensitivity towards fiber damage, xylan added in the oxygen stage

Daniel, Geoffrey and Ander, Paul and Filonova, Lada and Berg, S and Boussard,, L. and Heijnesson-Hultén,, A. and Kaňuchová, A and Lindström,, C. and Olsson,, A.-M. and Salmén,, L. and Sjöström,, K. (2011). Chemical pulping: the influence of xylan on the sensitivity towards fiber damage, xylan added in the oxygen stage. Uppsala: (S) > Dept. of Forest Products, Sveriges lantbruksuniversitet. Intern rapport / Centrum för forskning om vedfiberns ultrastruktur ; 4
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Abstract

The aim of this study was to investigate if extra xylan added during oxygen delignification of kraft spruce fibers could contribute to reduce the effect of fiber damage introduced during the cook. Two pulps were produced, one with and one without mechanical treatment at the end of the cook. The pulp produced without mechanical treatment was oxygen delignified with xylan added in the oxygen stage. The pulp produced with mechanical treatment was oxygen delignified both with and without xylan added. Results did not indicate that xylan added in the oxygen stage could repair the already introduced fiber damage. Added xylan had a fiber straightening effect as seen earlier when xylan was added in the cook. Xylan added in the oxygen stage resulted in improved tensile strength development. However, the negative effect from introduced mechanical treatment still influenced the strength properties more than could be compensated by the added xylan. SEM-images could not identify any differences between the investigated pulps. It seems likely that the birch xylan added forms a uniform but nonhomogeneous coating on the fiber surfaces. Possibly the xylan has penetrated into the fiber wall to a greater extent compared to previous studies when xylan was added in the cook

Authors/Creators:Daniel, Geoffrey and Ander, Paul and Filonova, Lada and Berg, S and Boussard,, L. and Heijnesson-Hultén,, A. and Kaňuchová, A and Lindström,, C. and Olsson,, A.-M. and Salmén,, L. and Sjöström,, K.
Title:Chemical pulping: the influence of xylan on the sensitivity towards fiber damage, xylan added in the oxygen stage
Series/Journal:Intern rapport / Centrum för forskning om vedfiberns ultrastruktur (BIB19552896)
Year of publishing :2011
Number:4
Number of Pages:44
Place of Publication:Uppsala
Publisher:Department of Forest Products, Swedish University of Agricultural Sciences.
Associated Programs and Other Stakeholders:Z - SLU - Libray > Odla mera
Language:English
Publication Type:Report
Article category:Other scientific
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 2 Engineering and Technology > 205 Materials Engineering > Paper, Pulp and Fiber Technology
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Forest Science
Agrovoc terms:chemical pulp, picea abies, carbohydrate contents, betula, processing, xylans, oxygen, delignification, fibre pulp
Keywords:chemical pulp, added xylan, spruce, birch xylans, physical properties, fibre damage, oxygen delignification
URN:NBN:urn:nbn:se:slu:epsilon-e-3603
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-3603
ID Code:13509
Faculty:S - Faculty of Forest Sciences
Department:(S) > Dept. of Forest Products
Deposited By: SLUpub Connector
Deposited On:18 Aug 2016 11:39
Metadata Last Modified:30 Aug 2016 08:54

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