Abstract
A wood block often changes its original dimension when it is kept in hot water. This is because the locked-in component of the growth stress is released by hygrothermal softening of the cell wall matrix. However, it is still unknown whether or not heating is a necessary requirement for the release of the visco-elastic locked-in component of the growth stress (GS). To solve this question, Agathis green specimen was treated by drying and re-swelling at room temperature, followed by boiling at 120 °C and 0.2 MPa. Then dimensions of green, re-swollen, and boiled specimens were measured at room temperature. Based on the obtained data, it was discussed whether the drying and subsequent re-swelling treatments release the visco-elastic locked-in component of the GS in green wood. The following conclusions were obtained. Locked-in component is released in part by the drying and subsequent re-swelling treatments without heating. After repeating the drying and subsequent re-swelling treatments, viscoelastic components are gradually released; however, rapid or complete release is made by boiling in hot water.
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Acknowledgments
The authors would like to thank Mr. Suhendri, a private forester, in Tenggarong, East Kalimantan, Indonesia, for giving us the chance of field measurement in his Agathis arboretum. The authors also express appreciation for financial support from the late Akiyoshi Tsukada, the former president of Toyotex Co. Ltd, Takamatsu, Japan.
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Tanaka, M., Yamamoto, H., Yoshida, M. et al. Retarded recovery of remaining growth stress in Agathis wood specimen caused by drying and subsequent re-swelling treatments. Eur. J. Wood Prod. 73, 289–298 (2015). https://doi.org/10.1007/s00107-015-0880-6
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DOI: https://doi.org/10.1007/s00107-015-0880-6