10か月間の水中貯木処理スギ材の乾燥性

摘要

Drying rate of Japanese cedar after water storage for ten months was examined using the 100℃ drying method. The purpose of this experiment is to confirm whether or not water storage of softwood has the effect to increase drying rate. Main results obtained were as follows: 1) Drying rate of sapwood samples increased by water storage for ten months. 2) However drying rate of heartwood samples did not change after water storage. The following explanation about drying property of softwood can be drawn according to these results that the drying rate for an actual size lumber through the total drying periods does not markedly increase by water storage for ten months because heartwood, which has the low drying rate, occupies larger portion than sapwood in the softwood lumber like sawed squares.%10か月水中貯木したスギ材について100℃試験により，乾燥開始後8時間までの乾燥経過を指数関数で近似したときの係数=乾燥速度減少係数を求め乾燥性を評価した。結果は以ドのようであった。1)10か"水中貯木したスギ試験材の含水率は.辺材では200％を越えていた。一方，心材では90％前後であった。これは伐採直後に材が示す含水率状態とほぼ近い。