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Initiation of wood defibration in groundwood pulping, single asperity indentation and scratching
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences. (Ångström Tribomaterials Group)ORCID iD: 0000-0002-7432-592X
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Mechanics.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences. (Ångström Tribomaterials Group)
2016 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 31, no 3, 401-406 p.Article in journal (Refereed) Published
Abstract [en]

To understand how the energy requirements of the mechanical pulping process can be reduced, the fundamental mechanisms behind fiber separation in Norway spruce were studied experimentally and analytically. Single tip scratching in heated water was used to reproduce initial defibration mechanisms found industrially. The resulting scratches were then compared with surfaces ground in a real industrial process. Moreover, the mechanical behavior of the wood microstructure was monitored with X-ray computed microtomography as a single hard tip was pressed into it. Subsequent digital image correlation was applied to estimate the strain field in the region around the indenting tip. Regions in the wood with high tensile or shear strains were identified, i.e. where cracking and fiber separation is believed to initiate.

Place, publisher, year, edition, pages
2016. Vol. 31, no 3, 401-406 p.
Keyword [en]
Defibration, Scratching, Strain analysis
National Category
Engineering and Technology Wood Science
Research subject
Engineering Science with specialization in Tribo Materials
Identifiers
URN: urn:nbn:se:uu:diva-310478ISI: 000387974800001OAI: oai:DiVA.org:uu-310478DiVA: diva2:1057076
Funder
Swedish Energy Agency
Available from: 2016-12-16 Created: 2016-12-16 Last updated: 2016-12-23Bibliographically approved

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