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Title: <論文>木材の水蒸気加熱膨化処理とその腐朽促進効果
Other Titles: <ORIGINAL>Puff-Cooking Treatment of Wood and Its Acceleration of Wood Decay
Authors: 綾木, 光弘  KAKEN_name
高橋, 旨象  KAKEN_name
西本, 孝一  KAKEN_name
Author's alias: AYAKI, Mitsuhiro
Issue Date: 24-Dec-1983
Publisher: 京都大学木材研究所
Journal title: 木材研究・資料
Volume: 18
Start page: 66
End page: 80
Abstract: 醤油原料の発酵促進に利用されている水蒸気加熱膨化処理(Puff-Cooking, PC処理と略記)が,残廃材の腐朽菌による分解促進の前処理として有効であるかを検討した。ブナおよびアカマツの心材から採取した木片ならびに木粉に,4 kg/cm2-20分から12 kg/cm2-60分までの5段階の処理を行なった。この処理木材に4種の腐朽菌を作用させ,重量減少率の比較から腐朽促進効果を検討するとと釧こ,各種化学成分の分析を行なった。軽度ならびに中程度(4~8 kg/cm^2)のPC処理では,アルコール・ベンゼン可溶成分の増加(ブナ材のみ),1%水酸化ナトリウム可溶成分の増加,γ-セルロースの減少,ホロセルロース分子量の増大があり,処理が苛酷になると,同分子量の低下,ホロセルロース中のα-セルロース構成比の増大,リグニンの減少等が認められた。 いくつかの樹種一決試菌の組合せについては腐朽促進効果があった。 その効果は軽度のPC処理段階から現われることが多く,熱処理材に対する腐朽力が比較的低い腐朽菌で顕著であった。木粉では木片より高い重量減少率が得られ,PC処理ぱ難腐朽性の針葉樹木粉の腐朽促進の前処理として有用であると考えられた。
Effect of puff-cooking treatment on wood was investigated for the resulting acceleration of wood decay and various chemical changes. This treatment has been successfully used as the pretreatment of grain for production of soya-sauce. Wafers and meal of beech (Fagus crenata BLUME) and pine (Pinus densiflora SIEB. et Zucc.) heartwood were treated and exposed to fungal attack using each two species of brown-rot- and white-rot fungi. Five treating conditions were employed : 4 (kg/ cm2)-20 (min), 4-60, 8-20, 8-60 and 12-60. At 4-8 (kg/cm2) treatments, increase of alcohol-benzene (only in beech) and 1 % sodium hydroxide soluble fractions, decrease of γ-cellulose, and increase of molecular weight of holocellulose were demonstrated. At 12 kg/m2 treatment, increase of α-cellulose/holocellulose ratio and decrease of molecular weight of holocellulose and lignin content were proved. Acceleration of decay was found in some combinations of wood and fungus, especially in Gloeophyllum trabeum and the two wood species. The acceleration occurred at all treating conditions but more greatly at light or medium treating conditions. It was enhanced markedly in pine wood meal. This treatment was considered to be promissing for an utilization of wood waste.
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