不同树龄米老排木材干燥工艺研究

Drying Technology of Different Ages Mytilaria laosensis Timber

利用百度试验法研究树龄及树高对米老排木材干燥特性的影响,确定米老排木材干燥工艺。结果表明:随着树龄的增长,木材的短表裂数量增多,长表裂长度增大,截面变形程度逐渐减缓,扭曲度不断变大;在同一树龄中,上端木材的扭曲程度较下端木材更严重,下端木材的翘曲度较上段木材更严重;米老排木材的干燥初期开裂综合等级为5级,内部开裂为2级,截面变形为3级,扭曲为5级,翘曲变形为2级,干燥速度为2级;采用本研究干燥工艺,30 mm厚米老排木材从初含水率76.78%降至6.02%,干燥周期为16.12 d。干燥缺陷综合质量等级为2级,可满足实木制品质量要求。

The effect of different ages and tree height on drying characteristics of Mytilaria laosensis timber was analyzed by using 100 ℃ test method and it’s the most suitable drying technology was proposed. The results showed that the number of short surface check, the length of long surface check, and distortion raise distinctly while cross section deformation decreases gradually as the age increase. At the same age, the distortion of the top wood is severer than that of the bottom wood, but the result of warp is opposite. The early cracking degree of M.laosensis is grade 5, the internal cracking is grade 2, the section deformation is grade 3, the distortion is grade 5,the warp deformation is grade 2 and the drying speed is grade 2. By using the drying process given in this paper,the moisture content of 30 mm thickness different ages M.laosensis timber decreased from 76.78% to 6.02%, and the drying period was 16.12 d and the comprehensive quality grade of dry defects is grade II, which can meet the quality requirements of solid wood products.