Abstract
For the purpose of technology development to control the humidity conditioning performance of slit material made from Japanese cedar, the effects of the groove shape of slit samples, air convection, and heat treatment on moisture adsorption and desorption properties were studied. The results obtained are as follows. The moisture adsorption and desorption rates of slit samples were increased with increase of end grain area of them. However, the moisture adsorption and desorption rates were not increased with increase of depth of concave, although the end grain area was increased. On the other hand, reduced rates of the slit samples with deep concave were increased by air convection. The increase ratios of moisture adsorption and desorption rates were larger in samples with deep concave. Equilibrium moisture content was decreased with increase of heat treatment temperature. Pore volume of micropores smaller than 0.6 nm was decreased with increases of heat treatment temperature. Compromise position of processing condition for slit material should be sought considering production and labor costs, drying conditions, and installation environment in addition to results obtained in this study.
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