Influence of Heat Treatment on the Water Uptake Behavior of Wood

• Main Authors: Yang Zhang, Deliang Xu, Libo Ma, Siqun Wang, Xiang Liu
• Format: Article
• Language: English
• Published: North Carolina State University 2017-01-01
• Series: BioResources
• Subjects: Heat treated temperature; Water uptake behavior; Oxygen/Carbon ratio; Weight loss
• Online Access: http://ojs.cnr.ncsu.edu/index.php/BioRes/article/view/BioRes_12_1_1697_Zhang_Heat_Treatment_Water_Uptake_Behavior

Dimensional stability is an important property of wood that is strongly influenced by its water uptake behavior. Heat treatment is one method to improve wood dimensional stability. This study investigated the effects of heat treatment on the water uptake behavior of wood using a wicking test. The thickness of the tested wood sample was similar to that of the surface wood panel in a 3-layer composite floorboard. It was treated at different temperatures ranging from 200 °C to 400 °C under a nitrogen atmosphere for 10 min to provide the test data to investigate the basic theory relating to dimensional stability of heat-treated wood processed at higher temperatures for a short length of time. During the test, the water uptake of larch (Larix gmelinii) and red oak (Quercus rubra) were recorded continuously. The heat-treated wood had a much lower water uptake ability than untreated wood during the early stage of the wicking test; untreated wood exhibited higher total water uptake. Compared with the untreated sample, the red oak wood treated at 400 °C had an average water uptake rate that decreased from 0.28 mg/mm3 per hour to 0.038 mg/mm3 per hour.