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Wood defects during industrial-scale production of thermally modified Norway spruce and Scots pine
Georg-August University, Germany.
Georg-August University, Germany.ORCID iD: 0000-0002-6909-2025
Georg-August University, Germany.
2017 (English)In: Wood Material Science & Engineering, ISSN 1748-0272, E-ISSN 1748-0280, Vol. 12, no 1, 14-23 p.Article in journal (Refereed) Published
Abstract [en]

This research investigates wood defects, particularly the formation of surface cracks, during the production of thermally modified wood and its exposure to cyclic moisture changes. Boards of Norway spruce and Scots pine originating from different steps within the production of ThermoWood® were collected and wood defects were investigated at macroscopic and microscopic scale. Subsequently, the wood was exposed to capillary wetting cycles to record its sensitivity towards cracking. After the modification process, typical anatomical defects of conventional kiln-drying became more frequent and severe, with the magnitude being to some extent depending on the presence of defects in the raw material. At microscopic scale, damages to ray parenchyma and epithelial cells as well as longitudinal cracks within the cell walls of earlywood tracheids were evident in thermally modified wood. Despite a lower water uptake and higher dimensional stability, thermally modified wood was more sensitive to surface cracking during wetting cycles than unmodified wood, i.e. at the outside face of outer boards (near bark). For limiting surface cracking of thermally modified wood during service life, the use of high-quality raw material, the exposure of the inside face of the boards (near pith) and the application of a surface coating are considered beneficial.

Place, publisher, year, edition, pages
Taylor & Francis, 2017. Vol. 12, no 1, 14-23 p.
Keyword [en]
Thermal modification, light microscopy, SEM, surface cracks, cell-wall features, wetting cycles
National Category
Wood Science
Research subject
Technology (byts ev till Engineering), Forestry and Wood Technology
Identifiers
URN: urn:nbn:se:lnu:diva-41810DOI: 10.1080/17480272.2014.988750OAI: oai:DiVA.org:lnu-41810DiVA: diva2:800820
Available from: 2015-04-07 Created: 2015-04-07 Last updated: 2017-02-02Bibliographically approved

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Adamopoulos, Stergios
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CiteExportLink to record
Permanent link

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Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf