Twisting force during drying of wood

The object of this study is to investigate when wood begins to twist and the extent of the twisting force during drying. Japanese larch ( Larix leptolepis Gord.) and hiba ( Thujopsis dolabrata Sieb. et Zucc. var. hondae Makino) which tend to twist significantly when drying, were used in experiments...

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Bibliographic Details
Published in:European journal of wood and wood products 2013-11, Vol.71 (6), p.689-695
Main Authors: Kubojima, Yoshitaka, Kobayashi, Isao, Yoshida, Takahisa, Matsumoto, Hiroshi, Suzuki, Youki, Tonosaki, Mario
Format: Article
Language:English
Subjects:
Biomedical and Life Sciences
Ceramics
Composites
Drying
Glass
Life Sciences
Machines
Manufacturing
Natural Materials
Originals Originalarbeiten
Processes
Timber
Twisting
Wood
Wood Science & Technology
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Summary:The object of this study is to investigate when wood begins to twist and the extent of the twisting force during drying. Japanese larch ( Larix leptolepis Gord.) and hiba ( Thujopsis dolabrata Sieb. et Zucc. var. hondae Makino) which tend to twist significantly when drying, were used in experiments to obtain multiple examples of grain angle (GA) variation in the R-direction. A measuring system to measure the twisting force during the drying of wood in real time was developed. It is thought that the time when twisting of timber by drying starts is subject to the variation in R-direction of GA; timber begins to twist when the portion with large GA begins to dry. There is concern that timber with large GA in the inner portion may become twisted during storage after kiln drying. The twisting stress measured in this study is effective for examining the load on the timber to control the twisting.
ISSN:0018-3768
1436-736X
DOI:10.1007/s00107-013-0732-1