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Single-stage hydrocyclone fractionation of refined bleached softwood pulp
RISE.ORCID iD: 0000-0003-0385-6202
Holmen.
Innventia.
2017 (English)In: Paper Conference and Trade Show, PaperCon 2017: Renew, Rethink, Redefine the Future, TAPPI Press, 2017, Vol. 2, p. 878-905Conference paper, Published paper (Other academic)
Abstract [en]

Refined bleached chemical softwood was fractionated using a hydrocyclone in a fine and a coarse fraction. The trials were done at three inject concentrations, three coarse fraction volume ratios, and with pulps refined with two refining levels. A large difference in sheet properties between fine and coarse fraction was observed. Compared with the feed pulp, the relative change in the sheet properties increased more in the fine fractions than it decreased in the coarse fractions. Increased fines proportion had a positive effect on all properties up to a certain level when a further improvement could not be observed. Interestingly, the fine fractions of both refining levels reached the same absolute strength level, both for the tensile properties and z-strength. The fine fractions at the highest coarse fraction mass ratios contained more fines, and the mean fibre was shorter and narrower. This led to higher density but also a decrease of the stretch-at-break and z-strength values. When comparing these results with previous fractionation results for unrefined pulp, it was found that inject concentration did not have a large effect on thickening in the present study. As for the refined pulp, the tensile index increased with fines proportion for the unrefined pulp, however, only up to a certain fines proportion where a maximum values was reached. The increase was larger for the refined pulps which had higher fines proportion.

Place, publisher, year, edition, pages
TAPPI Press, 2017. Vol. 2, p. 878-905
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:miun:diva-34838ISBN: 9781510847286 (print)OAI: oai:DiVA.org:miun-34838DiVA, id: diva2:1259410
Conference
PaperCon 2017
Available from: 2018-10-29 Created: 2018-10-29 Last updated: 2019-12-19Bibliographically approved

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Björk, Elisabeth

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CiteExportLink to record
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Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf