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Some aspects on strength properties in paper composed of different pulps
Karlstad University, Faculty of Technology and Science.
2007 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

For papermakers, an understanding of the development of strength properties in the paper is of uttermost importance. Strong papers are desirable both in the traditional paper industry as well as in new fields of application, such as fibre-based packaging and light-weight building material. In this study, the effects of adding abaca (Musa textilis) as a reinforcement fibre for softwood pulp was investigated. Moreover, the LB Multilayer Handsheet Former for the production of stratified sheets was evaluated and used to study the effects of placing selected fibres in separate layers, rather than by making homogeneous sheets from a mixture of the pulps.

Handsheets of a softwood sulphate pulp with the addition of abaca fibres were made in a conventional sheet former. It was seen that the addition of abaca fibres can increase the tearing resistance, fracture toughness, folding endurance and air permeance. Tensile strength, tensile stiffness and tensile energy absorption, however, decreased somewhat.

It was shown that the LB Multilayer Handsheet Former is suitable for studying the effects of stratification of paper. The sheet former produces sheets with good formation and the variation of paper properties of the sheets is retained at a fairly constant level when the number of layers in the stratified sheets is increased. The uniformity of the sheets produced in the LB Multilayer Handsheet Former are generally at the same level as of those produced in conventional sheet formers.

Homogeneous and stratified sheets were produced in the LB Multilayer Handsheet Former and it was found that by stratifying a sheet, so that pulp with a high tear index and pulp with a high tensile index are placed in separate layers, it was possible to increase the tear index by approximately 25%, while the tensile index was decreased by 10-20%.

Place, publisher, year, edition, pages
Fakulteten för teknik- och naturvetenskap , 2007.
Series
Karlstad University Studies, ISSN 1403-8099 ; 2007:38
Keywords [en]
paper strength, reinforcement, multilayer, stratified, handsheet former, abaca, southern pine
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
URN: urn:nbn:se:kau:diva-1196ISBN: 978-91-7063-141-2 (print)OAI: oai:DiVA.org:kau-1196DiVA, id: diva2:5004
Presentation
2007-10-26, Nyqvistsalen 9C203, 9C, Karlstad Universitet, Karlstad, 13:00
Opponent
Supervisors
Available from: 2007-10-08 Created: 2007-10-08
List of papers
1. Abaca as a reinforcement fibre for softwood pulp
Open this publication in new window or tab >>Abaca as a reinforcement fibre for softwood pulp
2007 (English)In: TAPPI Journal, ISSN 0734-1415, Vol. 6, no 10, p. 25-32Article in journal (Refereed) Published
National Category
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-1907 (URN)
Available from: 2007-10-08 Created: 2007-10-08 Last updated: 2017-12-07Bibliographically approved
2. Handsheet former for the production of stratified sheets
Open this publication in new window or tab >>Handsheet former for the production of stratified sheets
2009 (English)In: Appita journal, ISSN 1038-6807, Vol. 62, no 4, p. 272-278Article in journal (Refereed) Published
National Category
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-1908 (URN)
Available from: 2007-10-08 Created: 2007-10-08 Last updated: 2017-12-07Bibliographically approved
3. Paper strength evaluation both in homogeneous and in stratified sheets with selected fibres
Open this publication in new window or tab >>Paper strength evaluation both in homogeneous and in stratified sheets with selected fibres
(English)In: Journal of Pulp and Paper Science (JPPS), ISSN 0826-6220Article in journal (Refereed) Submitted
Identifiers
urn:nbn:se:kau:diva-1909 (URN)
Available from: 2007-10-08 Created: 2007-10-08 Last updated: 2017-12-07Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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  • de-DE
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Output format
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