2003 Fiscal Year Final Research Report Summary
Shrinkage stress of wood during drying under superheated steam and its mechanism
| Project/Area Number |
14560135
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
林産学
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
MOROOKA Toshiro KYOTO UNIVERSITY, Wood Research Institute, Associate Professor, 木質科学研究所, 助教授 (00192378)
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| Co-Investigator(Kenkyū-buntansha) |
NORIMOTO Misato KYOTO UNIVERSITY, Wood Research Institute, Professor, 木質科学研究所, 教授 (20027163)
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| Project Period (FY) |
2002 – 2003
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| Keywords | Wood / drying stress / shrinkage stress / su / superheated steam / Viscoelasticity / compressive deformation / chemical analysis |
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| Research Abstract |
In order to reduce the internal stress of wood during drying, an attempt was made to dry wood with superheated steam above 100℃. Sugi (Cryptomeria japonica D.Don) wood specimens were dried with radial restraint using superheated steam at up to 180℃ and the resulting restrained shrinkage stress was examined. A load cell capable of measuring shrinkage stress inside an autoclave was developed and the shrinkage stress was measured at temperatures from 80 to 180℃ and a relative humidity of 0 to 80%. It was found that the shrinkage stress decreased dramatically with drying above 140℃ and above 60 percent relative humidity. It was also found that the shrinkage stress above 140℃ occurred even at 100%RH and was ascribed to the structural change of cell wall components.
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