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CRUW chemical pulping sub-project 1: the influence of xylan on the sensitivity towards fiber damage

Daniel, Geoffrey and Ander, Paul and Filonova, Lada and Kaňuchová, Andrea and Lindstrom, Curt and Olsson,, Ann-Mari and Heijnesson-Hultén, Anette and Sjöström, Karin and Boussard, Leif and Salmén, Lennart and Berg, Staffan (2010). CRUW chemical pulping sub-project 1: the influence of xylan on the sensitivity towards fiber damage. Uppsala: (S) > Dept. of Forest Products, Sveriges lantbruksuniversitet. Intern rapport / Centrum för forskning om vedfiberns ultrastruktur ; 2
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Abstract

The aim of this study was to determine if the presence and position of xylan in the fiber wall are of importance for the degree of damage introduced into fibers during mechanical action in the cook. Kraft pulps from spruce with different amounts of xylan have been produced in the laboratory, either by adding birch xylan in different positions in the cook or by redistribution of spruce xylan. At the end of the cook, fiber damages were introduced by subjecting the fibers to shear and compression forces. The extra birch xylan had adsorbed on the fiber surfaces, the outer fiber walls (presumably S1/primary wall) as well as on the fiber cell lumen wall. Xylan penetration into the fiber wall was very low. A large variation in coverage of surface xylan within the fibers and between fibers was noted. No significant difference between pulps produced in the different ways or between the pulps produced with or without mechanical treatment could however be observed. The extra xylan added resulted as expected in an improved tensile strength development for these pulps. No direct indications were seen that the extra xylan added during the cook resulted in a lower amount of introduced damaged areas. But some positive tendencies could be noted for the pulps produced with extra xylan added including: a lower kink/mm and lower amount of cleavage/fiber measured by the HCL method; and the zero-span level and tear-tensile relationship were not inferior compared to the reference despite the higher xylan content. The removal and subsequent re-introduction of xylan into the cook seemed to negatively influence the strength properties, i.e. the tear-tensile relationship was inferior compared to the reference pulp. The redistribution procedure may have drained the fiber wall of xylan negatively influencing the strength properties

Authors/Creators:Daniel, Geoffrey and Ander, Paul and Filonova, Lada and Kaňuchová, Andrea and Lindstrom, Curt and Olsson,, Ann-Mari and Heijnesson-Hultén, Anette and Sjöström, Karin and Boussard, Leif and Salmén, Lennart and Berg, Staffan
Title:CRUW chemical pulping sub-project 1: the influence of xylan on the sensitivity towards fiber damage
Series/Journal:Intern rapport / Centrum för forskning om vedfiberns ultrastruktur (BIB19552896)
Year of publishing :2010
Number:2
Number of Pages:88
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 > 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, xylans, chemical compostion
Keywords:chemical pulp, xylan, spruce, birch xylan, physical properties, fibre damage
URN:NBN:urn:nbn:se:slu:epsilon-e-3597
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-3597
ID Code:13508
Faculty:S - Faculty of Forest Sciences
Department:(S) > Dept. of Forest Products
Deposited By: SLUpub Connector
Deposited On:18 Aug 2016 09:04
Metadata Last Modified:18 Aug 2016 11:35

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