Assessment of hygroscopic conditioning performance of interior decorative materials IV: Sorption characteristics of wood under high relative humidity condition |
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| Authors: | Song-Yung Wang Chih-Feng Liau |
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| Institution: | (1) Department of Forestry, College of Agriculture, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei, Taiwan, ROC |
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| Abstract: | The equilibrium moisture content (EMC) of six wood species under desorption conditions of 20°C and 100%  0% relative humidity (RH), and the rate of adsorption at various depths of three wood species blocks under 98% RH at 22.5°C were studied. There were no significant differences among the EMC values for these six wood species over the RH range 40% 0%, but there were highly significant differences over the RH range 100% 50% at constant 20°C. The amount of moisture absorbed in the wood decreased curvilinearly with the increase of depth in the specimens as sorption time increased, and their relation could be represented by a semilogarithmic equation. Time-dependent adsorption behavior at various depths of the wood specimens could be represented by an exponential equation as a function of the product of the difference between moisture contents at equilibrium and initial conditions and the term (1 – e–t/ ). The value of of various wood species was found to increase linearly with the increased depth of the specimen and showed the following trend: hard maple (Acer sp.) > China fir (Cunninghamia lanceolata) > Japanese cedar (Cryptomeria japonica D. Don).Part of this report was presented at the 47th annual meeting of the Japan Wood Research Society, Kochi, April 1997. |
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| Keywords: | Depth of absorption Absorbed moisture content Time-dependent adsorption Effectiveness of hygroscopic conditioning |
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