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Study of the influence of charges on refinability of bleached softwood kraft pulp
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Wood Chemistry and Pulp Technology.ORCID iD: 0000-0002-8992-3623
2013 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, Vol. 28, no 4, 588-595 p.Article in journal (Refereed) Published
Abstract [en]

To investigate how the number of charged groups affects the refinability of pulp, different levels of fibre charge were introduced to fully bleached softwood kraft pulp by bulk carboxymethylation. The chemical compositions of the fibres thus remained similar and the effect of the charge could be evaluated. The pulps were refined in a PFI-mill. The introduction of additional charges clearly resulted in a higher refinability in terms of a higher WRV for a given energy input. However, the increase in swellability was not accompanied by a corresponding increase in tensile index. The highly charged pulps suffered severe damage to the fibre wall during refining, showing that the combination of high charge levels and mechanical forces cause destruction of the fibre wall, which inhibits paper strength development.

Place, publisher, year, edition, pages
2013. Vol. 28, no 4, 588-595 p.
Keyword [en]
Bleached softwood kraft pulp, Carboxymethylation, Refinability, Tensile strength, WRV
National Category
Paper, Pulp and Fiber Technology
URN: urn:nbn:se:kth:diva-140182DOI: 10.3183/NPPRJ-2013-28-04-p588-595ISI: 000328642400014ScopusID: 2-s2.0-84891842664OAI: diva2:688657
Swedish Energy Agency

QC 20140117

Available from: 2014-01-17 Created: 2014-01-17 Last updated: 2014-02-05Bibliographically approved

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