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Influence of fibre/fibre joint strength and fibre flexibility on the strength of papers from unbleached kraft fibres
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
2005 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 20, no 2, 186-191 p.Article in journal (Refereed) Published
Abstract [en]

The joint strength between single fibres and its influence on strength properties of papers was evaluated, taking into account the effect of pulp yield, ionic form of the carboxyl groups and drying. Fibre/fibre joint strength stayed almost constant for pulps with yield between 45 % and 50 %. Further increasing the pulp yield increased the joint strength until a maximum value was reached at a pulp yield of around 57 %, after which the joint strength decreased. Joint strength correlated well to paper tensile strength for never dried fibres, i.e. a lower joint strength resulted in lower sheet tensile index. The decrease in sheet tensile index was not as pronounced as the decrease in joint strength. Changing counter-ion from Na+ to Ca2(+) or H+ did not affect fibre flexibility, although it reduced the joint strength as the molecular contact area decreased due to a reduced swelling upon changing the counter-ions. Drying the high yield pulp lowered both the joint strength and the sheet tensile index to the same extent. The sheet tensile index, for the low yield pulp, decreased much more than the fibre/fibre joint strength after drying the fibres. In conclusion, a combination of a lower fibre flexibility, resulting in fewer contact points between fibres in the sheet, and a lower joint strength after drying was responsible for the reduction in sheet tensile index.

Place, publisher, year, edition, pages
2005. Vol. 20, no 2, 186-191 p.
Keyword [en]
bonded area, bonding strength, counter-ions, flexibility, hornification, joints, pulp yield, tensile strength, unbleached pulp
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:kth:diva-14887DOI: 10.3183/NPPRJ-2005-20-02-p186-191ISI: 000230271800008Scopus ID: 2-s2.0-20744441111OAI: oai:DiVA.org:kth-14887DiVA: diva2:332928
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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