Topochemical modification of fibres during kraft pulping
2005 (English)In: Appita Annu. Conf., 2005, 155-160 p.Conference paper (Refereed)
Xylan dissolution, degradation and redeposition in the birch kraft cook have been examined. The molecular weight of the dissolved xylan was determined through gel permeation chromatography and the loss in molecular weight could be correlated to the amount of degraded xylan in the initial parts of the cook. This indicates that peeling is the only significant xylan degradation reaction early in the cook. Two different birch black liquors containing xylan with the molecular weight of 12.200 g/mol and 5.950 g/mol respectively, were added to softwood kraft cooks in order to determine the effect on pulp strength properties by birch xylan. The results show an increase in both tensile strength and tensile stiffness. The magnitude of the strength increase was affected very much by the molecular weight of xylan. High molecular weight xylan addition increased the tensile strength with more than 10% measured at 1000 PFI revolutions. The tensile stiffness was also increased by xylan addition, high molecular weight to a larger extent than low molecular weight.
Place, publisher, year, edition, pages
2005. 155-160 p.
, Appita Annual Conference, ISSN 1443-5454 ; 2
Dissolution, Gel permeation chromatography, Molecular weight, Tensile strength, Birch xylan, Kraft pulp, Dissolving, Kraft Pulping, Tensile Stress, Xylans
Paper, Pulp and Fiber Technology
IdentifiersURN: urn:nbn:se:kth:diva-156514ScopusID: 2-s2.0-29344466426OAI: oai:DiVA.org:kth-156514DiVA: diva2:767332
59th Appita Annual Conference and Exhibition, incorporating the 13th ISWFPC: International Symposium on Wood, Fibre and Pulping Chemistry, 16-19 May 2005, Auckland, New Zealand
QC 201412012014-12-012014-11-282015-10-29Bibliographically approved