20.500.12556/DiRROS-16885 Quality control of thermally modified timber using dynamic vapor sorption (DVS) analysis 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 thermal modification quality control dynamic vapour sorption wood moisture content termična modifikacija kontrola kakovosti dinamična sorpcija vodne pare les vlažnost lesa true false true MDPI Angleški jezik Slovenski jezik © 2020 by the authors. Licensee MDPI, Basel, Switzerland. Neznano 2023-08-31 09:28:55 2023-08-31 09:37:47 2023-09-01 03:35:15 0000-00-00 00:00:00 2020 0 0 Nasl. iz nasl. zaslona; Opis vira z dne 12. 6. 2020; 666; str. 1-12 iss. 6 Vol. 11 2020 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 2020-06-11 630*8 1999-4907 10.3390/f11060666 19360259 https://www.mdpi.com/1999-4907/11/6/666 Open access 1 46325cdd-47bf-11ee-8cc8-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=22948 RAZ_Humar_Miha_2020.pdf RAZ_Humar_Miha_2020.pdf 1 F9EA13740AFCAA596916DF073B33BB12 e5a18e9d7826bb39926f2b8f0a14ea8359229d98c7194c752bf5725f21405d0e 76f66a5a-47c0-11ee-8cc8-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=22949 Zavod za gradbeništvo Slovenije 0 0 0