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Open AccessArticle

Quality Control of Thermally Modified Timber Using Dynamic Vapor Sorption (DVS) Analysis

1
Biotechnical Faculty, University of Ljubljana, 1000 Ljubljana, Slovenia
2
Slovenian National Building and Civil Engineering Institute, 1000 Ljubljana, Slovenia
3
Faculty of Chemistry and Chemical Technology, University of Ljubljana, 1000 Ljubljana, Slovenia
4
Wood Biology and Wood Products, University of Goettingen, 37077 Goettingen, Germany
5
Sitik d.o.o., 1295 Ivančna Gorica, Slovenia
*
Author to whom correspondence should be addressed.
Forests 2020, 11(6), 666; https://doi.org/10.3390/f11060666
Received: 13 May 2020 / Revised: 3 June 2020 / Accepted: 9 June 2020 / Published: 11 June 2020
(This article belongs to the Special Issue Performance of Wood and Wood-Based Materials)
The importance of thermal modification is increasing worldwide. Increased use of thermally modified timber (TMT) has resulted in a need for reliable quality control, comprising control of variation of the production within defined limits, allowing third-party control in the case of certification and the regulation of customer complaints and claims. Techniques are thus needed to characterise the modification of quality in terms of improved target properties of TMT during industrial production, and of TMT products that have been in service for an arbitrary time. In this study, we aimed to utilise dynamic vapor sorption (DVS) for this purpose. Norway spruce (Picea abies) and European beech (Fagus sylvatica) samples were thermally modified at different temperatures according to different heat treatment techniques: (1) the Silvapro process based on an initial vacuum; (2) an air heat treatment, whereby samples were wrapped in aluminium foil; (3) thermal modification of wood samples in the ambient atmosphere in a laboratory oven. Wood samples from closed processes were analysed for validation. TMT was characterised with respect to mass loss, colour and density. Mass loss of wood due to modification (MLTM) was correlated with factors derived from DVS analysis. The present DVS measurements suggest that the equilibrium wood moisture content (EMC95% RH), the time to reach 10% wood moisture content (t10% MC), and the elongation factor, c, derived from a logarithmic function, can serve as alternative parameters to characterise the quality of several thermal modification processes. Further studies are recommended using other wood species, different modification processes and further parameters gained from DVS measurements to understand the robustness and the predictive power of the applied technique. View Full-Text
Keywords: thermal modification; quality control; dynamic vapour sorption; wood; moisture content thermal modification; quality control; dynamic vapour sorption; wood; moisture content
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Humar, M.; Repič, R.; Kržišnik, D.; Lesar, B.; Cerc Korošec, R.; Brischke, C.; Emmerich, L.; Rep, G. Quality Control of Thermally Modified Timber Using Dynamic Vapor Sorption (DVS) Analysis. Forests 2020, 11, 666.

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