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Is it possible to constrain moisture movement of densified wood product mechanically?
Linnaeus University, Faculty of Science and Engineering, School of Engineering. (Virkeslära)ORCID iD: 0000-0002-8824-5090
Linnaeus University, Faculty of Science and Engineering, School of Engineering. (Virkeslära)
Linnaeus University, Faculty of Science and Engineering, School of Engineering. (Virkeslära)
2011 (English)In: Mechano-chemical transformation of wood during THM processing / [ed] Navi, P. & Roth, A, Biel Switzerland: Bern University of Applied Sciencs, Architecture, Wood and Civil Engineering , 2011, 67-68 p.Conference paper, Published paper (Refereed)
Abstract [en]

Densification of wood in the transverse direction increases the density. One of the reasons for densifying wood is to produce high quality timber from timbers of low quality. However, densified wood shows an undesired behaviour, i.e. a tendency to return to its initial dimensions when it is subjected to heat and humidity, i.e. shape memory. There are several methods to overcome the problem of shape memory.

This study uses a three-layered cross-laminated wood panel where one of the layers is of densified wood and the other two are of normal wood together these will mechanically restrain the shape memory of the densified layer.

The study includes three stages:

  • Densification of clear wood in the radial direction
  • Manufacture of a three-layered cross laminated composite product with densified wood as a service layer
  • Testing of the shape stability when the composite was subjected to variations relative humidity (40-85 % RH at 20°)

The result of this study reveals the significance of service to bottom layer thickness ratio on the shape stability of the cross laminated composite. Consequently, the performance and the shape stability of the cross laminated composite were significant when the service to bottom layer thickness ratio increases. Therefore, it appears feasible to disclose the appreciable degree of shape stability, hardness and wear resistance of the product. Accordingly, cross laminated composite can be considered as one of the promising mechanical methods for improving moisture movement of densified wood product.

Place, publisher, year, edition, pages
Biel Switzerland: Bern University of Applied Sciencs, Architecture, Wood and Civil Engineering , 2011. 67-68 p.
Series
COST Action FP0904
Keyword [en]
thermo-hudro-mechanical processing, densification, panel
National Category
Wood Science
Research subject
Technology (byts ev till Engineering), Forestry and Wood Technology
Identifiers
URN: urn:nbn:se:lnu:diva-21029ISBN: 978-3-9523787-0-0 (print)OAI: oai:DiVA.org:lnu-21029DiVA: diva2:543181
Conference
COST Action FP0904 Workshop, "Mechano-chemical transformation of wood during THM processing", February 16-18, 2011 / Biel (Bienne), Switzerland
Available from: 2012-08-29 Created: 2012-08-06 Last updated: 2016-05-03Bibliographically approved

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