Influence of spruce xylan characteristics on tensile strength of spruce kraft pulp
2015 (English)In: Holzforschung, ISSN 0018-3830, E-ISSN 1437-434X, Vol. 69, no 1, 1-7 p.Article in journal (Refereed) Published
The aim of the study was to investigate the possibility to use spruce xylan more efficiently by possible relocation of dissolved xylan with certain characteristics from the first part of the kraft cooking to the later part, when precipitation occur. The characteristics of re-located xylan was controlled by replacing half the black liquor (BL) at a late stage of a kraft cook, with the same amount of black liquor containing spruce xylan with known molecular weight and content of uronic acid (UA). Pulp with addition of xylan with high amount of UA groups responded strongly on beating, resulting in improved tensile strength. It is proposed that the best effect of xylan on tensile strength occurs when the xylan penetrates some distance into the subsurface of the fiber wall. Both low molecular weight (M-w) and a high degree of substitution decreases the tendency of xylan to aggregate, which enables the dissolved xylan to penetrate some distance into the exposed fiber surface. Upon beating, this xylan will be exposed thus facilitating improved fiber-fiber joint formation, which leads to increased tensile strength.
Place, publisher, year, edition, pages
2015. Vol. 69, no 1, 1-7 p.
kraft cooking, spruce, tensile strength, uronic acid, xylan
Paper, Pulp and Fiber Technology
IdentifiersURN: urn:nbn:se:kth:diva-159109DOI: 10.1515/hf-2014-0010ISI: 000346764600001ScopusID: 2-s2.0-84920088278OAI: oai:DiVA.org:kth-159109DiVA: diva2:784304
QC 201501292015-01-292015-01-222015-05-25Bibliographically approved