10×10cm橡膠木正角材之窯乾基凖

Kiln Schedule for 10×10cm Rubber Wood

翟思湧(Sy-Yung Jai) ； 熊如珍(Ju-Chen Hsiung) ； 黃清吟(Chin-Yin Hwang)

《林業試驗所研究報告季刊》 5卷3期 (1990/09) Pp. 175-186

https://doi.org/10.7075/BTFRI.199009.0175

摘要

台灣中部產約35年生之巴西橡膠木，鋸為10×10×170cm之試材，以高溫乾燥、預噴汽高溫乾燥、低~高溫乾燥、與中~高溫乾燥四種處理進行試驗。結果顯示：高溫與預噴汽高溫乾燥，具有節省能源及縮短時間之功效，但易招致乾裂與深棕變。低~高溫與中~高溫乾燥，可有效降低棕變程度，減少乾裂；但會延長乾燥時間。若為防止棕變，橡膠木不宜採行高溫乾燥；高溫高濕會促進棕變之發生。

關鍵字

高溫乾燥 ； 低～高溫乾燥 ； 中～高溫乾燥 ； 預噴汽高溫乾燥 ； 橡膠木

並列摘要

The objective of this research was to develop a kiln schedule for 10×10cm rubber wood (Hevea brasiliensis). Forty-one sample bolts, 170cm in length, ranging in diameter from 37 to 55cm, cut from sixteen 35-year-old rubber trees in central Taiwan, were used for this study. The test boards were kiln dried separately by four drying schedules and then compared primarily for drying rate and defects.
The four treatments (drying schedules) were as follows:
HT=high temperature drying.
SH=presteaming-high temperature drying.
LH=low～high temperature drying.
MH=medium～high temperature drying.
From this study we have concluded:
1). High temperature drying reduces quite a lot of drying time and energy consumption, but it is susceptible to incur checks and dark-brown stain.
2). Treatments HT and SH save power consumption more than 37 percent, save oil consumption more than 38 percent, and reduce drying time over 48 percent, as compared with treatments LH and MH.
3). A lower temperature and lower relative humidity kiln schedule can reduce the occurrence of drying checks and brown stain; however, the drying time will be considerably prolonged.
4). It is suggested that 10×10cm rubber wood can be dried by high temperature, if brown stain is accepted by the end use; otherwise the lower temperature and lower relative humidity kiln schedule should be adopted.
5). We recommend that further tests be conducted to find out the best combination of temperature and relative humidity for preventing brown stain in rubber wood.

並列關鍵字

High temperature drying ； low～high temperature drying ； medium～high temperature drying ； presteaming-high temperature drying ； rubber wood