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AKD sizing of TCP and ECF bleached birch pulp characterized by peroxide edge wicking index
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Fibre Technology.ORCID iD: 0000-0001-8622-0386
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Fibre Technology.
2006 (English)In: Nordic Pulp and Paper Research Journal, ISSN 0283-2631, Vol. 21, no 2, 237-244 p.Article in journal (Refereed) Published
Abstract [en]

To study the impact of extractable materials and xylan on the sizing efficiency of totally chlorine-free (TCF) bleached birch pulp and elemental-chlorine-free (ECF) bleached birch pulp, several pulps with different amounts of extractable material were studied. The content of extractable material in the pulp was shown to be detrimental for sizing efficiency, measured both as Cobb60 values and edge penetration in a model liquid packaging board, and a higher content of extractable material causes a reduced sizing efficiency for a given pulp. No significant difference was observed between extracted TCF and ECF bleached birch pulps, while unextracted pulps containing the same amount of extractable material yielded different sizing efficiencies. The TCF bleached birch pulp had a lower sizing efficiency than did the ECF bleached birch, probably because of differences in the fatty acid composition. A greater amount of extractable material also resulted in a smaller fraction of non-extractable alkyl ketene dimers (AKD) relative to the total amount of AKD in the sheet. Enzymatic removal of xylan and thus the reduction of the surface charge had no measurable effect on sizing efficiency. Extracted TCF and ECF bleached pulps only need a content of 0.05 kg/ton non-extractable AKD or 0.08 kg/ton total AKD in the sheets produced to achieve a good sizing effect.

Place, publisher, year, edition, pages
2006. Vol. 21, no 2, 237-244 p.
Keyword [en]
Absorption, AKD, ECF, Edge penetration, Hardwood, Kraft, Liquid packaging board, Peroxide edge wicking index, TCF, Dimers, Hardwoods, Peroxides, Sizing effect, Bleached pulp, Box Boards, Elemental Chlorine Free Bleaching, Ketenes, Kraft Pulps, Total Chlorine Free Bleaching
National Category
Paper, Pulp and Fiber Technology
URN: urn:nbn:se:kth:diva-156328ScopusID: 2-s2.0-33745630658OAI: diva2:766788

QC 20141128

Available from: 2014-11-28 Created: 2014-11-26 Last updated: 2015-10-16Bibliographically approved

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