Is it possible to constrain moisture movement of densified wood product mechanically?
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 (Refereed)
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.
, COST Action FP0904
thermo-hudro-mechanical processing, densification, panel
Research subject Technology (byts ev till Engineering), Forestry and Wood Technology
IdentifiersURN: urn:nbn:se:lnu:diva-21029ISBN: 978-3-9523787-0-0OAI: oai:DiVA.org:lnu-21029DiVA: diva2:543181
COST Action FP0904 Workshop, "Mechano-chemical transformation of wood during THM processing", February 16-18, 2011 / Biel (Bienne), Switzerland