W. Cheng, T. Morooka, Y. Liu, M. Norimoto
Shrinkage stress of wood during drying under superheated steam above 100°C
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.
Holzforschung, Walter de Gruyter
Print ISSN: 0018-3830
Volume: 58, 07/2004
Pages: 423 - 427
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