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Moisture-induced surface roughness in TMP sheets
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences, Engineering and Mathematics. (Mekaniskmassa)
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences, Engineering and Mathematics. (Mekaniskmassa)
2008 (English)In: Journal of Pulp and Paper Science (JPPS), ISSN 0826-6220, Vol. 34, no 3, 139-146 p.Article in journal (Refereed) Published
Abstract [en]

The present study evaluates effects of moisture on sheet properties made different Bauer-McNett fractions from TMP, both individually and in combinations. It is well known that the coarse, stiff, long fibre fractions cause surface roughness in dry sheets. However, this study indicates that these fibres remain relatively unchanged when moisture diffuses into the sheet structure, i.e., the degree of decollapse is low. The fibres from the middle fraction rise easily, causing the greatest change in surface roughness when moisture is added to the sheet. Sheets including both coarse fibres and fibres from the middle fractions display the highest surface roughness values at a high moisture content. The trials also indicate that fines contribute to increased surface roughness: when the degree of bonding in the sheet structure is increased, there is a risk that the whole structure or the flocks, instead of the individual fibres, may swell.

Place, publisher, year, edition, pages
2008. Vol. 34, no 3, 139-146 p.
Keyword [en]
TMP, Reject refining, surface roughness, moisture
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:miun:diva-8392ISI: 000264027300001Scopus ID: 2-s2.0-60649112852OAI: oai:DiVA.org:miun-8392DiVA: diva2:134502
Available from: 2009-01-21 Created: 2009-01-21 Last updated: 2017-12-14Bibliographically approved
In thesis
1. Effects of Reject Refining at High Temperature on TMP Fibre Properties
Open this publication in new window or tab >>Effects of Reject Refining at High Temperature on TMP Fibre Properties
2008 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Sundsvall: Mid Sweden University, 2008. 79 p.
Series
Mid Sweden University doctoral thesis, ISSN 1652-893X ; 64
Keyword
Fibre collapse, fibre decollapse, high temperature, refining, reject, roughening, bonding, acoustic emission, mechanical pulping, softening temperature, bond strength
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:miun:diva-8397 (URN)978-91-86073-17-6 (ISBN)
Public defence
2008-11-28, M108, Sundsvall, 10:00 (Swedish)
Opponent
Supervisors
Available from: 2009-01-22 Created: 2009-01-21 Last updated: 2009-01-22

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Norgren, SvenHöglund, Hans

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