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Use of fines-enriched chemical pulp to increase CTMP strength
RISE Research Institutes of Sweden, Bioeconomy and Health, Pulp, Paper and Packaging. Mittuniversity, Sweden.ORCID iD: 0000-0003-0385-6202
RISE Research Institutes of Sweden, Bioeconomy and Health, Pulp, Paper and Packaging.
Holmen AB, Sweden.
Mittuniversity, Sweden.ORCID iD: 0000-0003-1881-6473
2021 (English)In: TAPPI Journal, ISSN 0734-1415, Vol. 20, no 4, p. 255-263Article in journal (Refereed) Published
Abstract [en]

In this study, fines-enriched pulp (FE-pulp)-the fine fraction of highly-refined kraft pulp-was benchmarked against highly-refined kraft pulp (HRK-pulp) as a strength agent in eucalyptus chemithermomechanical pulp (CTMP). Both the FE-pulp and the HRK-pulp were produced from unbleached softwood kraft pulp, and equal amounts of those strength agents were added to the original CTMP, as well as to washed CTMP, where most of the fines had been removed. The effects of the added strength agents were evaluated with laboratory handsheets. The FE-pulp proved to be twice as effective as HRK-pulp. Both HRK-pulp and FE-pulp increased the strength of the CTMP handsheets. The bulk of the handsheets decreased, however, as well as the drainability. The addition of 5% FE-pulp resulted in the same strength increase as an addition of 10% HRK-pulp, as well as the same decrease in bulk and CSF. For the handsheets of washed CTMP, the strengths were not measurable; the CTMP lost the sheet strength when the CTMP-fines content was reduced through washing. The reduced strength properties were compensated for by the addition of chemical pulp fines that proved to be an efficient strength agent. The addition of 5% FE-pulp restored the strength values, and at a higher bulk and higher drainability. Application: In this study, we show how the strength of a CTMP sheet can be improved by adding fine material from kraft pulp.

Place, publisher, year, edition, pages
2021. Vol. 20, no 4, p. 255-263
Keywords [en]
Paper, Pulp and Fiber Technology, Pappers-, massa- och fiberteknik
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:ri:diva-56886OAI: oai:DiVA.org:ri-56886DiVA, id: diva2:1612502
Available from: 2021-11-18 Created: 2021-11-18 Last updated: 2023-05-16Bibliographically approved

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Björk, Elisabeth

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