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Licensed Unlicensed Requires Authentication Published by De Gruyter June 1, 2005

Shrinkage stress of wood during drying under superheated steam above 100°C

  • W. Cheng , T. Morooka , Y. Liu and M. Norimoto
From the journal Holzforschung


In order to reduce the internal stress of wood during drying, an attempt was made to dry wood with superheated steam above 100°C. Sugi (Cryptomeria japonica D. Don) wood specimens were dried with radial restraint using superheated steam at up to 180°C, 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°C and a relative humidity of 0% to 80%. It was found that the shrinkage stress decreased dramatically with drying above 140°C and above 60% relative humidity. It was also found that the shrinkage stress above 140°C occurred even at 100% RH and was ascribed to the structural change in cell-wall components.

Published Online: 2005-06-01
Published in Print: 2004-07-07

Copyright © 2004 by Walter de Gruyter GmbH & Co. KG

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