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Comparison of strength properties in stratified and mixed paper
Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Health, Science and Technology (starting 2013), Paper Surface Centre.
2008 (English)Conference paper, (Other (popular science, discussion, etc.))
Abstract [en]

Research has been undertaken with the aim of displacing the tensile-tear relationship towards higher strength values. Three commercial pulps were refined in an Escher-Wyss conical refiner. A softwood sulphate pulp was refined to three different levels of dewatering resistance, while a southern pine pulp and an abaca pulp were refined separately to a dewatering resistance of 17SR. The amount of fines in these two pulps was reduced by fractionation on a bow screen. Two-layer laboratory sheet were produced in a multilayer handsheet former and compared with single-layer sheets made from an homogeneous mixture of the two pulps, either softwood plus southern pine or softwood plus abaca. Analysis revealed that when increasing the degree of refining for the softwood pulp, the tensile index for the stratified sheets was increased and reached a constant level at 27.5 SR. For the mixed sheets, the tensile index increased further with increased refining. While the tear index remained at a fairly constant level for the stratified sheets, it decreased for the mixed sheets with increased degree of refining. No effect of the stratification was observed for the sheets consisting of softwood and southern pine. It has been shown that by placing a reinforcement pulp of considerably higher tearing resistance potential than the bulk pulp in a separate layer instead of homogeneously mixing the pulps, the tensile index of the sheet can be increased by increased refining of the bulk pulp with maintained tear index

Place, publisher, year, edition, pages
2008.
Keyword [en]
stratification, strength properties
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
URN: urn:nbn:se:kau:diva-17764ISBN: 9789512293919 (print)OAI: oai:DiVA.org:kau-17764DiVA: diva2:591378
Conference
Progress in Paper Physics Seminar 2008
Projects
Starka papper / Strong papers
Available from: 2013-01-21 Created: 2013-01-21 Last updated: 2013-01-21

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