Effect of thermal treatment on the bending strength of black alder wood was examined. The wood samples were treated at temperature of 60, 80 100 and 120°C and duration for 12, 24, 48 and 96 hours. It was determined that bending strength was decreased as the treatment temperature and duration was increased. Effect of heating temperature and duration on static bending strength depends on temperature. At lower (60–80°C) temperatures, influence of heating duration was more intensive, but at higher temperatures (100–120°C) more intensive effect of temperature was found. After thermal treatment average decrease of bending strength was found approximately 8 %. After heat treatment moisture of black alder wood decreases twice, while thermal treatment at relatively low temperatures does not influence on density changes.
Keywords: black alder wood, thermal treatment, bending strength, density, moisture content
Authors
Mikalauskienė V.
Department of Wood Technology, Kaunas University of Technology, Kaunas
Juodeikienė I.
Department of Wood Technology, Kaunas University of Technology, Kaunas
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