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Effects of Reject Refining at High Temperature on TMP Fibre Properties
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences, Engineering and Mathematics. (Mekaniskmassa)
2008 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Sundsvall: Mid Sweden University , 2008. , p. 79
Series
Mid Sweden University doctoral thesis, ISSN 1652-893X ; 64
Keywords
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: urn:nbn:se:miun:diva-8397ISBN: 978-91-86073-17-6 (print)OAI: oai:DiVA.org:miun-8397DiVA, id: diva2:134514
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
List of papers
1. Investigation of the z-direction strength properties of paper by use of acoustic emission monitoring
Open this publication in new window or tab >>Investigation of the z-direction strength properties of paper by use of acoustic emission monitoring
2008 (English)In: Journal of Acoustic Emission, ISSN 0730-0050, Vol. 26, p. 23-31Article in journal (Refereed) Published
Keywords
z-direction, acoustic emission, strength
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:miun:diva-8395 (URN)
Available from: 2009-01-21 Created: 2009-01-21 Last updated: 2015-03-13Bibliographically approved
2. Acoustic emission monitoring to evaluate the z-direction and in-plane strength properties of TMP reject fraction
Open this publication in new window or tab >>Acoustic emission monitoring to evaluate the z-direction and in-plane strength properties of TMP reject fraction
(English)Manuscript (Other academic)
Keywords
acoustic emission, TMP, reject, z-direction, in-plane strength
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:miun:diva-8396 (URN)
Available from: 2009-01-21 Created: 2009-01-21 Last updated: 2011-05-29Bibliographically approved
3. Moisture-induced surface roughness in TMP sheets
Open this publication in new window or tab >>Moisture-induced surface roughness in TMP sheets
2008 (English)In: Journal of Pulp and Paper Science (JPPS), ISSN 0826-6220, Vol. 34, no 3, p. 139-146Article 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.

Keywords
TMP, Reject refining, surface roughness, moisture
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:miun:diva-8392 (URN)000264027300001 ()2-s2.0-60649112852 (Scopus ID)
Available from: 2009-01-21 Created: 2009-01-21 Last updated: 2017-12-14Bibliographically approved
4. Irreversible long fibre collapse at high temperature refining in a TMP system: Effects on fibre and surface properties
Open this publication in new window or tab >>Irreversible long fibre collapse at high temperature refining in a TMP system: Effects on fibre and surface properties
2009 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 24, no 1, p. 19-24Article in journal (Refereed) Published
Abstract [en]

Effects on fibre and sheet properties of preheating to temperature well above the softening temperature of lignin in refining of spruce TMP reject were evaluated. This study indicates that an improved surface smoothness can be attained on TMP-based wood-containing papers through high-temperature reject refining. Under these conditions the degree of irreversible fibre collapse increased. Results from tests of the fibre-wall, fibre surface characteristics, pulp yield and sheet brightness show only marginal differences at high temperatures compared to standard reject refining. Experiments in which laboratory sheets were moistened showed that a high degree of irreversible fibre collapse correlates with surface smoothness.

Keywords
fibre collapse, high temperature, reject refining, TMP
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:miun:diva-8393 (URN)10.3183/NPPRJ-2009-24-01-p019-024 (DOI)000265250200002 ()2-s2.0-65349151235 (Scopus ID)
Available from: 2009-01-21 Created: 2009-01-21 Last updated: 2017-12-14Bibliographically approved
5. Irreversible long fibre collapse at high temperature TMP reject refining - initial studies
Open this publication in new window or tab >>Irreversible long fibre collapse at high temperature TMP reject refining - initial studies
2004 (English)In: Pulp & paper Canada, ISSN 0316-4004, Vol. 105, no 7, p. 47-51Article in journal (Refereed) Published
Abstract [en]

Effects of preheating temperature on energy consumption,fibre collapse and pulp quality in refining of spruce TMP reject material were studied. At preheating to temperatures well above the softening temperature of lignin thick-walled fibres were collapsed to a higher degree. Shives and fibres in the BMN +10 fraction were efficiently reduced. An increase in sheet density was obtained. Energy consumption was reduced, at a certain freeness level. This study indicates that an improved surface smoothness can be achieved as result of high temperature reject refining.

Keywords
High temperature, Thermomechanical, Smoothness, Rejects refiners, Collapse, Pulping
National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-2323 (URN)000223006500009 ()2493 (Local ID)2493 (Archive number)2493 (OAI)
Available from: 2008-09-30 Created: 2008-12-16 Last updated: 2017-12-12Bibliographically approved

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Norgren, Sven

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