Biological resistance and hygroscopicity of the heat-treated wood under nitrogen atmosphere.

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  • 窒素雰囲気下で熱処理された木材の耐朽性，耐蟻性および吸湿性
  • チッソ フンイキカ デ ネツ ショリサレタ モクザイ ノ タイキュウセイ タイギセイ オヨビ キュウシツセイ

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Abstract

Biological resistance and hygroscopicity of the wood treated by heat (140 - 240°C) for 24 hours under nitrogen atmosphere were investigated.<BR>Fungal resistance test was carried out as described in JIS K 1571: 2004. Mass loss of heattreated sugi (Cryptomeria japonica D. Don) sapwood subjected by Fomitopsis palustris - FFPRI 0507 and Trametes versicolor - FFPRI 1030 decreased, as the heating temperature increased. Especially, the wood treated at 220°C and 240°C showed high resistance against fungi. Similar result was also shown by the fungus cellar (soil-bed) test. But the termite resistance of the wood treated at 240°C was not high in the laboratory.<BR>Field stake tests were also carried out as described in JIS K 1571: 2004. Resistance against fungi and termite in the field increased by heat treatments.<BR>Hygroscopicity of the heat-treated wood decreased as the heating temperature increased. It was considered that decrease of hygroscopicity had some effect on increase of biological resistance.

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