造林木乾燥性質之研究

Studies on the Drying Characteristics of Plantation-grown Trees

翟思湧(Sy-Yung Jai) ； 熊如珍(Ju-Chen Hsiung)

《林業試驗所研究報告季刊》 10卷1期 (1995/03) Pp. 25-31

https://doi.org/10.7075/BTFRI.199503.0025

摘要

本研究旨在以小試體急速乾燥的方法，就省產造林木之乾燥性質進行評估，作為加工利用之參考。供試樹種為15-20年生之柳杉與6、11、15及21年生四個齡級之台灣杉。試體規格為2×10×20cm之平鋸板。各組試體置於100-105℃具有強制循環之電烘箱中急速乾燥後，再就各試體初期端、面裂，內部乾裂與橫斷面變形3項乾燥缺點之發生程度進行評估。結果顯示：柳杉與台灣杉均屬易於乾燥的樹種，其2.5cm厚之板材可以初期溫度55℃，初期濕球差度3℃，及末期溫度80℃之窯乾條件進行乾燥。唯以各該造林木之弦、徑向收縮比均在2.5以上，故易發生瓦形翹曲，窯乾詩應配合重壓處理。

關鍵字

乾燥性質 ； 造林木 ； 柳杉 ； 台灣杉

並列摘要

The drying characteristics of plantation-grown Cryptomeria japonica and Taiwania cryptomerioides have been examined by accelerated drying method. Flat-sawn spccimens, 2cm in thickness, 10cm in width, and 20cm in length were studied. The drying temperature was 100~105℃. The results of this study indicate that both Cryptomeria and Taiwania are easy to dry species. The 2.5cm lumber can be dried under the following conditions: initial temperature -55℃, initial wet bulb depression -3℃, and final temperature -80℃. Owing to the shrinkage ratio of radial and tangential of Cryptomeria and Taiwania is 1 to 2.5 and up, the lumber are prone to cup during drying.

並列關鍵字

Drying characteristics ； plantation-grown tress ； Cryptomeria ； Taiwania