スギ木口面材の調湿性能－材の厚さの影響－

抄録

The humidity control capacity of Sugi end-grain wood installed in a sealed box is investigated using the Cb value for specimen thicknesses ranging from 1 mm to 30 mm. The Cb value is defined as the ratio of the humidity difference in a box lined with a specimen to that in an empty box when subjected to sinusoidal temperature variation. The temperature variation periods were set at four steps, ranging from 6 hours to 48 hours. Based on the results at a period of 24h, Cb values demonstrated good humidity control capacity for specimen with a thickness of 10 mm or more. From the variation in Cb values with specimen thickness, the thickness contributing to humidity control capacity, termed the 'effective thickness,' was determined. The Cb values decrease with an increase in the temperature variation period. The manner of this decrease is governed by two factors: effective thickness and specimen thickness. Furthermore, it was found that by specifying sample thickness and effective thickness for each variation period, Cb values can be estimated through calculation alone, without the need for experimental procedures.