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Increased joint-forming ability of ductile kraft pulp fibres by polyelectrolyte multilayer treatment-Influence of refining and drying strategies
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences. (FSCN – Fibre Science and Communication Network)
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences. (FSCN – Fibre Science and Communication Network)
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
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2007 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 22, no 2, p. 228-235Article in journal (Refereed) Published
Abstract [en]

In this study a sack paper furnish was used. It consisted of a high-consistency kraft pulp refined in either an atmospheric pressure or a pressurized system. The pulps were subsequently low-consistency refined in an Escher-Wyss laboratory refiner to 17.5-20.5 SR. Ordinary ISO sheets and freely dried sheets were manufactured from these pulp samples to serve as reference sheets. The laboratory sheets made of pulp from the pressurized system had a higher strain at break and tensile energy adsorption index but a lower tensile index than sheets made of pulp from a conventional atmospheric highconsistency refiner. These sheets were subject to a polyelectrolyte multilayer treatment to increase the interaction between the fibres, thus enhancing the paper strength properties. The polyelectrolyte multilayers (PEM) were applied by sequentially treating fibres from an unbleached kraft pulp for sack paper production with cationic starch and anionic carboxymethyl cellulose. The multilayer treatment was only applied to 50% of the stock and both ordinary ISO sheets and freely dried sheets were prepared with one and three layers of polyelectrolyte. Evaluation of the strength properties of the sheets showed that the addition of only one layer of starch increased strain at break, tensile index, tensile energy adsorption index, and out-of-plane properties measured as Scott-bond values. Using the multilayer technique created large increases in Scott-bond, a measure of the internal bonding of the sheets. The achieved effects were significantly larger than those usually achieved by applying starch alone to enhance the out-of plane strength properties. Also, the density increased considerably when the third layer was applied, for both ISO and freely dried sheets, though the tensile strength was enhanced significantly only in the freely dried sheets.

Place, publisher, year, edition, pages
2007. Vol. 22, no 2, p. 228-235
Keywords [en]
adsorption, interaction, mechanical properties, multilayer
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:miun:diva-4169DOI: 10.3183/NPPRJ-2007-22-02-p228-235ISI: 000248057800012Scopus ID: 2-s2.0-34547365094Local ID: 4864OAI: oai:DiVA.org:miun-4169DiVA, id: diva2:29201
Available from: 2008-09-30 Created: 2009-06-08 Last updated: 2017-12-12Bibliographically approved
In thesis
1. High Consistency Mechanical Treatment of Kraft Pulps under Steam Pressurised Conditions - Effects on Fibre and Sheet Properties
Open this publication in new window or tab >>High Consistency Mechanical Treatment of Kraft Pulps under Steam Pressurised Conditions - Effects on Fibre and Sheet Properties
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Sundsvall: Mittuniversitetet, 2007. p. 67
Series
Mid Sweden University doctoral thesis, ISSN 1652-893X ; 29
National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-8891 (URN)978-91-85317-60-8 (ISBN)
Public defence
(English)
Available from: 2009-05-06 Created: 2009-05-06 Last updated: 2009-07-16Bibliographically approved
2. Influence of Polymeric Multilayer Treatment on Out-of Plane Properties of CTMP-Based Paperboard
Open this publication in new window or tab >>Influence of Polymeric Multilayer Treatment on Out-of Plane Properties of CTMP-Based Paperboard
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Sundsvall: Mittuniversitetet, 2007
Series
Mid Sweden University doctoral thesis, ISSN 1652-893X ; 40
Keywords
CTMP, Bulk, Multilayer, Polymre adsorption, Scott-Bond, Tensile strength, anionic starch, paperboard, cationic starch, CMC, sack paper, Stagnation Point Adsorption Reflectometry
National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-8897 (URN)978-91-85317-78-3 (ISBN)
Public defence
(English)
Available from: 2009-05-06 Created: 2009-05-06 Last updated: 2009-07-16Bibliographically approved

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Pettersson, GunillaSjöberg, JessicaHöglund, Hans

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