米老排锯材干燥中试研究  

Pilot-scale Experiment on the Drying of the Sawn Timber of Mytilaria laosensis

作　　者：刁海林[1] 唐继新[2] 唐贤明[1] 郑华庭[1] 白灵海[2] 罗建举[1] 

机构地区：[1]广西大学林学院,广西南宁530004 [2]中国林业科学研究院热带林业实验中心,广西凭祥532600

出　　处：《西北林学院学报》2012年第6期168-173,共6页Journal of Northwest Forestry University

基　　金：广西林业重大招标项目(桂林科字[2009]第7号)

摘　　要：进行米老排(Mytilaria laosensis)锯材干燥中试,验证中试干燥基准的正确性,以求获得适于米老排生产应用的干燥基准。采用生产中广泛使用的强制气流循环普通干燥窑,在给定的中试干燥基准下对米老排锯材实施中级干燥试验,并按照国家标准(GB/T 6491-1999)进行锯材干燥质量评定。试验结果表明:米老排锯材干燥产品的平均终含水率7.5%;厚度含水率偏差为0.91%;应力指标4.06%;平均顺弯度为0.36%,横弯度为0.14%;扭曲度为0.29%;瓦弯度为2.54%;纵裂度为4.79%;截面收缩率为0.19%;无内裂。干燥至含水率12%时所用时间为224h(9.33d);干燥速度为0.36%·h-1。锯材总体干燥质量等级为二级,达到木制品生产对米老排锯材干燥质量的要求。A pilot-scale test on the drying of the sawn timber of Mytilaria laosensis was carried out to exam- ine the accuracy of the Chinese drying schedule. A widely applied drying kiln with a forced air circulation system was adopted to implement intermediate level drying with a given test drying schedule. The quality of the dried sawn timber was evaluated according to national standard （GB/T 6491-1999）. The related pa- rameters of the dried M. laosensis sawn timber were as follows： average final moisture content： 7.5% thickness moisture deviation： 0.91%; stress index. 4.06%; average longitudinal bending degree.. 0.36; lateral bending degree： 0.14% distortion degree： 0.29~ tile shape bending degree： 2.54%longitudi- nal cracking degree： 4.79% ; cross section shrinkage rate： 0.19%. No internal crack was observed. The time of drying to a water content of 12% was 224 h （9.33 d） ; drying speed was 0.36%· h ^-1. The overall drying quality of sawn timber achieved grade two, indicating that the quality of M. laosensis sawn timber after drying could meet the production requirements.

关 键 词：米老排 锯材 干燥基准 中试 

分 类 号：S781.71[农业科学—木材科学与技术]