Relationship between Acoustic Velocity and Distortion with Kiln-Drying for Douglas-fir Timber
Introduction Distortion of timber, in forms of bow, spring and twist, from plantation forests has been a concern in wood drying. Understanding and quantification of the impact of wood properties have been extensively studied. However, there is still a substantial proportion of dried timber being rejected in commercial drying due to excessive distortion. Growth characteristics including corewood, reaction wood, growth stress and forest stand type are considered to be key factors causing instability of timber with kiln-drying and in-service. One way to mitigate this problem is to presort the green timber and segregate the distortion-prone timber before drying, thus saving energy and reducing loss. From previous studies, it is known that acoustic waves traveling lengthwise through a timber board are affected by the growth characteristics. Therefore, acoustic velocity, which is regarded as an effective surrogate measure of stiffness, can also capture and reflect some wood characteristics which may cause wood distortion. The objectives of this study are to determine if there are strong relationships between the acoustic properties of Douglas fir full sized green timber and distortion developed during kiln drying, and to evaluate the potential of using acoustic properties as presorting criteria.
Taian Chen Shusheng Pang Eric Wang Andrew Karalus
Wood Technology Research Centre, University of Canterbury, New Zealand South-West Forestry College, Wood Technology Research Centre, University of Canterbury, New Zealand New Zealand Douglas-fir Association, New Zealand
国际会议
International Symposium on Wood Science and Technology(IAWPS 2008)(国际木材产品学会联合会2008学术研讨会)
哈尔滨
英文
137-138
2008-09-27（万方平台首次上网日期，不代表论文的发表时间）