摘要
比较分析了杉木枝材与干材的密度、干缩湿胀率、化学组成、弦切面色度、纤维素结晶度及热解特性。结果表明:枝材的基本密度和气干密度均大于干材。枝材的弦向和体积全干干缩率均小于干材,枝材的弦向和体积全湿胀率分别约为干材的60%和74%,两者的径向全干干缩率和全湿胀率基本相当。枝材纤维素的结晶度为(41.15±1.47)%,远小于干材(65.86±1.44)%。枝材弦切面的明度值小于干材,而两者的a*和b*值在心材和边材之间略有不同。枝材边材与干材边材的色差为17.981,两者的心材色差也达到13.482。枝材的主要质量损失区域温度范围为150~375℃,而干材的区域范围为230~375℃,超过375℃后,枝材的质量损失率小于干材。可见,杉木枝材与干材的利用应该选择不同的方式和途径。研究结果可望为杉木枝材的高效和高值化利用提供理论依据。
The density, shrinkage and bulking ratio, chemical compositions, tangential section chromaticity, cellulose crystalline and pyrolysis characteristics of branch and truck wood were measured and compared to each other. Results showed that the basic and air-dried density of branch wood were greater than that of truck wood. The tangential and volume shrinkage of branch wood from green to bone dry were smaller than that of truck wood. Similarly, compared to the truck wood, the tangential and volume bulking rate of branch wood were 60% and 74%, respectively. On the other hand, the redial shrinkage and bulking rate from green to bone dry were almost equal for these two types of wood. The cellulose crystalline of branch wood was（41.15±1.47）%, and much less than that of truck wood（65.86±1.44）%. The tangential brightness value of branch wood was lower than that of truck wood. However, a＊ and b＊ values were obviously different in heartwood and sapwood from branch and truck wood. The chromatic aberration of sapwood vs sapwood and heartwood vs heartwood of branch and truck wood were 17.981 and 13.482, respectively. The chief weightlessness temperature range was from 150℃ to 375℃ in branch wood,but which was from 230℃ to 375℃ in truck wood. When the pyrolysis temperature exceed 375℃, the weight loss ratio in branch wood was less than that in truck wood. All of these suggested that it should select different methods and application areas for the utilization of branch and truck wood from Chinese fir. Therefore, it is desired to provide theoretical basis in order to efficiently utilize the branch wood from Chinese fir.
出处
《林业工程学报》
北大核心
2017年第1期20-24,共5页
Journal of Forestry Engineering
基金
"十二五"国家科技支撑计划项目(2012BAD24B01)
关键词
枝桠材
密度
色度
纤维素结晶度
热重分析
：branch wood
density
chromaticity
cellulose crystalline
thermogravimetric analysis
