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Tailoring of fibre/fibre joints in order to avoid the negative impacts of drying on paper properties
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.ORCID iD: 0000-0001-8622-0386
2006 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 21, no 3, 411-418 p.Article in journal (Refereed) Published
Abstract [en]

This work examines the possibility of changing the properties of the contact zone between fibres to control the physical properties of paper. This was done by linking the degree of contact of the contact zones in the fibre/fibre joints to joint strength, and furthermore, to the fibre and sheet properties. Kraft pulps of various yields were dried in order to collapse the fibre surface and fibre wall, to achieve a fibre with lower wet-fibre flexibility and fibre-surface deformability. This treatment produced fibres with lower water retention capacity and paper with lower sheet density, higher bending stiffness, and lower tensile strength. The changes in the sheet properties with drying were largely due to the decreased wet-fibre flexibility and deteriorated fibre contact-zone properties that reduced the fibre/fibre joint strength. By adding polyelectrolyte multilayers (PEM) or polyelectrolyte complexes (PEC), obtained from weak polyelectrolytes, to the dried pulp prior to fibre/fibre joint and sheet forming, the tensile and compression strength properties of the paper were significantly improved. Tensile strength increased up to 108% with no significant influence on either the sheet density or the water retention capacity of the fibres. Paper strength most likely increased due to the increase of the fibre/fibre joint strength arising from the improved contact-zone properties, where the increased work of adhesion and greater degree of contact of the fibre/fibre joints resulted in higher joint strength.

Place, publisher, year, edition, pages
2006. Vol. 21, no 3, 411-418 p.
Keyword [en]
bonded area, bonding strength, chemical bonds, dry strength, joints, Kraft pulp, paper strength, polyelectrolyte, recycling, swelling, unbleached kraft fibers, weak polyelectrolytes, strength, flexibility, multilayers
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:kth:diva-16085ISI: 000241531500017Scopus ID: 2-s2.0-33750380817OAI: oai:DiVA.org:kth-16085DiVA: diva2:334127
Note
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2017-12-12Bibliographically approved
In thesis
1. Fibre/fibre joints: Their characterization and influence on different paper strength properties
Open this publication in new window or tab >>Fibre/fibre joints: Their characterization and influence on different paper strength properties
2006 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Stockholm: KTH, 2006. ix, 71 p.
Series
Trita-FPT-Report, ISSN 1652-2443 ; 2006:29
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:kth:diva-11882 (URN)
Public defence
2006-10-27, SCA salen, Mittuniversitetet, Holmgatan 10, Sundsvall, 10:00 (English)
Supervisors
Note
QC 20100923Available from: 2010-01-19 Created: 2010-01-19 Last updated: 2010-09-23Bibliographically approved

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Wågberg, Lars

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