頁籤選單縮合
題名 | 熱處理對三種國產人工林木材物理性質之影響(II)--吸濕性與尺寸安定性變化=Effect of Heat Treatment on the Physical Properties of Three Domestic Plantation Wood Species (II)--Changes of Hygroscopicity and Dimension Stability |
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作者姓名(中文) | 黃姿文; 卓志隆; | 書刊名 | 林產工業 |
卷期 | 31:4 2012.12[民101.12] |
頁次 | 頁175-186 |
分類號 | 436.187 |
關鍵詞 | 人工林木材; 熱處理; 平衡含水率; 全收縮率; 抗收縮效能; Platation wood; Heat treatment; Equilibrium moisture content; Maximum volumetric shrinkage; Anti-shrinkage effect; |
語文 | 中文(Chinese) |
中文摘要 | 本研究以杉木("Cunninghamia lanceolata")、柳杉("Cryptomeria japonica")以及大葉桃花心木("Swietenia macrophylla")三種人工林國產木材為研究對象,探討以170℃、190℃、210℃及230℃四種處理溫度,分別進行維持1、2、4及8 h的木材熱處理後之木材吸脫濕性性能與尺寸安定性的變化。結果顯示,熱處理能減少木材水分吸收量,有效降低木材的平衡含水率約50%以上,處理溫度越高,平衡含水率越低;木材經熱處理後可降低尺寸收縮率,且弦向與徑向的收縮率差異減小,弦向與徑向之抗收縮效能(ASE)隨熱處理溫度的升高與時間的增長而提升,當熱處理溫度達210℃以上時,ASE幾乎都可達50%以上。 |
英文摘要 | The objective of this study was to evaluate effects of heat treatment on the hygroscopicity and dimensional stability of wood specimens. Three plantation wood species including China fir ("Cunninghamia lanceolata"), Japanese cedar ("Cryptomeria japonica") and big-leaf mahogany ("Swietenia macrophylla") were used in this study. Heat treatments were carried out at temperature levels of 170℃, 190℃, 210℃ and 230℃ for time spans of 1 h, 2 h, 4 h and 8 h in a heating unit. The results showed that values of equilibrium moisture content (EMC) at given relative humidity and the hygroscopicity of heat-treated wood samples were significantly lower than those of the untreated ones. The values of EMC decreased significantly as the treated temperature increasing. The values of shrinkage determined from green to oven-dry conditions for treated samples were significantly lower in comparison with untreated samples, and the shrinkage difference between tangential and radial direction was reduced after heat treatment. The anti-shrinkage effect (ASE) in tangential and radial directions of wood samples increased along with the increase of treated temperatures and time durations. An ASE of above 50% was obtained by heating wood samples over 210℃. |
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