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Chemical pulping: the influence of the molecular weight of added xylan on pulp properties

Daniel, Geoffrey and Ander, Paul and Kim, Jong Sik and Filonova, Lada and Olsson, Anne-Marii and Salmén, Lennart and Sjöström, Karin and Boussard, Leif and Heijnesson-Hultén, Anette (2013). Chemical pulping: the influence of the molecular weight of added xylan on pulp properties. Uppsala: (S) > Dept. of Forest Products, Sveriges lantbruksuniversitet. Intern rapport / Centrum för forskning om vedfiberns ultrastruktur ; 9
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Abstract

The aim of this study was to investigate if added beech xylan with low molecule
weight (Mw) could penetrate into the fiber wall to a greater extent compared to
xylan with high Mw. The high Mw (ca 11000) xylan was degraded using enzymes
to obtain xylan with low Mw (ca 1800). The influence from the added xylan on the
strength properties was evaluated. The cooks in this study were performed without
mechanical damage introduced during the cooking process, thus any conclusions
of the impact from adding low Mw xylan on the sensitivity towards mechanical
damage was not possible.
The different microscopy analyses performed could not show any evidence for a
higher penetration of xylan into the fiber wall when producing the pulp with
addition of low molecular weight (low Mw) xylan.
The low Mw xylan did not contribute to any improved pulp properties, rather the
opposite. Addition of low Mw-xylan did not result in straighter fibers compared to
the Ref-pulp, which was the case for the high Mw-xylan-pulp. The tensile indexdevelopment
(tensile vs PFI-beating and tensile vs density) for the low Mw-pulp
was even worse compared to the Ref-pulp. The pulp produced with addition of the
high Mw-xylan showed, as earlier seen, an improved tensile index development
compared to the Ref-pulp

Authors/Creators:Daniel, Geoffrey and Ander, Paul and Kim, Jong Sik and Filonova, Lada and Olsson, Anne-Marii and Salmén, Lennart and Sjöström, Karin and Boussard, Leif and Heijnesson-Hultén, Anette
Title:Chemical pulping: the influence of the molecular weight of added xylan on pulp properties
Series/Journal:Intern rapport / Centrum för forskning om vedfiberns ultrastruktur (BIB19552896)
Year of publishing :2013
Depositing date:30 August 2016
Number:9
Number of Pages:50
Place of Publication:Uppsala
Publisher:Department of Forest Products, Swedish University of Agricultural Sciences
Language:English
Publication Type:Report
Article category:Other scientific
Full Text Status:Public
Agris subject categories.:K Forestry > K50 Processing of forest products
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Forest Science
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Wood Science
Agrovoc terms:molecular weight, xylans, fagus, pulp, chemicophysical properties
Keywords:low molecule weight, beech xylan, pulp properties
URN:NBN:urn:nbn:se:slu:epsilon-e-3631
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-3631
ID Code:13512
Faculty:S - Faculty of Forest Sciences
Department:(S) > Dept. of Forest Products
Deposited By: SLUpub Connector
Deposited On:30 Aug 2016 08:49
Metadata Last Modified:30 Aug 2016 08:49

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