3cm厚橡膠木之高溫乾燥

High-temperature Drying of 3cm Rubber Wood

翟思湧(Sy-Yung Jai) ； 李銘鐘(Ming-Chung Lee)

《林業試驗所研究報告季刊》 2卷1期 (1987/03) Pp. 31-42

https://doi.org/10.7075/BTFRI.198703.0031

摘要

省產35 年生巴西橡膠木，鋸製為3×16×120cm之試材，以高溫乾燥與普通窯乾進行配對試驗，結果顯示：高溫乾燥可縮短乾燥時間72%以上，節省能源45%以上；乾燥瑕疵無顯著性之差異，但高溫乾燥材之表面僵化程度較重；高溫(110℃)乾燥對橡膠木之強度性質無影響；橡膠木(3cm)可採行高溫乾燥。

關鍵字

高溫乾燥 ； 普通窯乾 ； 巴西橡膠木 ； 表面僵化

並列摘要

High-temperature drying of wood apears to be a growing trend for reducing energy consumption in manufacturing most wood products. The objective here was to investigate the efficiency of high-temperature drying (mixture of steam and air process) compared with conventional kiln drying, and evaluate the feasibility of high-temperature drying of 3cm Rubber Wood.
Thirteen Heavea brasiliensis bolts, 120cm in length, ranging in diameter from 21 to 53cm, cut from two 35-year-old Rubber trees in middle part of Taiwan, were used for this study. The bolts were then sawed into 3-by 16cm test boards. During sawing, each two consecutive boards made up a matched set, one to be dried by high-temperature (110℃) and the other to be dried by conventinal-temperature (below 83℃). The average green M.C. of the test boards was 73.24 percent, and the specific gravity based on ovendry weight and green volume was 0.561. Moisture content during drying was monitored by the standard sample board method.
Results of this research are shown as follows:
1. 3cm Rubber Wood can be dried at high-temperature of about 110℃ (230°F) without degradation (Table 4.).
2. High-temperature drying can reduce drying time over 72 percent, and saving energy over 45 percent compared to conventional-temperature drying (Table 3.).
3. No statistically significant differences in warp and strength were found between treatments; while the color of the material dried with high-temperature was slightly darker than those dried with conventional-temperature (Table 4, and
5.).
4. The tangential shrinkage of the material dried by high-temperature was higher than those dried by conventional-temperature; how v r, the radial shrinkage of the former was slightly lower than the latter when the M. C. below 10 percent (Fig. 6,7).
5. The drying stress (casehardening) in high-temperature dried material is greater than those in conventional-temperature.

並列關鍵字

High-temperature drying ； Conventional-temperature drying ； Rubber Wood ； Casehardening