頁籤選單縮合
題 名 | 南洋材高溫乾燥試驗 |
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作 者 | 吳學旦; 藍浩繁; | 書刊名 | 林產工業 |
卷 期 | 4:4 1985.12[民74.12] |
頁 次 | 頁19-26 |
分類號 | 474.28 |
關鍵詞 | 材; 南洋; 高溫; 乾燥; 試驗; |
語 文 | 中文(Chinese) |
中文摘要 | 3公分厚之五種南洋進口濶葉樹材分別以如次之三種乾燥基準進行試驗:(1)生材直接進窰以110℃之溫度實施乾燥,至達10%最終含水率止。(2)生材先以傳統式窰乾至含水率25%或30%而後再以110℃高溫窰乾至最終含水率10%止。(3)由生材先行氣乾處理至含水率25%或30%而後再續行110℃高溫窰乾至最終含水率10%止。(2)及(3)在本報告中稱為二段式乾燥法。試驗結果顯示pulai,jelutong以及Keruing均能自生材直接逕行高溫乾燥處理而無乾燥缺點發生,而Kapur以及batu逕行高溫乾燥處理者即發生蜂巢裂或蜂巢裂伴生潰陷,但施以二段式乾燥處理時則亦可獲滿意之乾燥結果。五種樹種中不論逕行高溫乾燥或二段式高溫乾燥處理所得之試材與其氣乾材相較時則其抗劈裂強度均有下降,而靜力抗彎及順紋抗壓強均有增加,batu之二段式高溫乾燥處理材其順紋抗張強度(Tension parallel to grain)及韌性(toughness)與氣乾材相較則亦下降。 |
英文摘要 | Lumber, 3 cm in thickness of 5 tropical Asian hardwood species, was kiln dried by three schedules shown below; (1)110℃ on stock green was dried directly from the saw to the final MC 10%, (2) use of conventional drying from the green condition to about 25% or 30% MC, then dried to 10% at 110℃, (3)use of air seasoning from the green condition to about 25% or 30% MC, then dried to 10% at 110℃, (2) and (3) were regarded as two-step drying schedule hereafter. Pulai, jelutong and kerning could be dried by the first schedule without the occurrence of drying defects, On the contrary, an assortment of defects was rather common for kapur and batu. However, when No. (2) and (3) schedules were employed, the results were very satisfactory too. It was highly conspicuous that No, (1) schedule was not suitable for drying wood cut from kapur and batu. The most common drying defects thus occurred were honeycoming or combinations of honecombing and other defects such as collapse. The cleavage strength of 5 species dried by all schedules suggested above were all decreased, while the static bending and compression parallel to grain were all increased in contrast with those only dried by air seasoning. Tension parallel to grain and toughness of batu dried by twostep drying schedules were all decreased. |
本系統中英文摘要資訊取自各篇刊載內容。