电阻法测定桉木的共晶点及共熔点  

Measurement of The Eutectic Point and Melting Point of Eucalyptus Wood Based on Electric Resistance Method

作　　者：王雅炳 杨琳 许萱 WANG Yabing;YANG Lin;XU Xuan(College of Furnishings and Industrial Design,Nanjing Forestry University,Nanjing 210037,China)

机构地区：[1]南京林业大学家居与工业设计学院,南京210037

出　　处：《家具》2021年第1期25-28,52,共5页Furniture

基　　金：江苏省苏北科技专项SZ-SQ2017014;教育部生物质材料科学与技术重点实验室(东北林业大学)开放基金项目(SWZ-MS201903)。

摘　　要：桉木干燥困难,干燥之后容易产生变形、开裂及皱缩等问题,严重影响了其实木化利用的进程。冷冻干燥技术可提高桉木的干燥质量,减少干燥过程中产生的皱缩。温度的设定是真空冷冻干燥过程中的重要基础参数,采用电阻法对桉木的共晶点与共熔点展开研究,分别对桉木试材的径向、弦向和长度方向的电阻值进行测定,并记录其电阻值突变时的温度。结果表明:试验中测量的尾巨桉木材的共晶点为-8℃,共熔点为-5.3℃;尾叶桉木材的共晶点为-9℃,共熔点为-5.7℃。升温与降温时的桉木电阻值变化曲线相似但不重合。Eucalyptusis difficult to dry. After drying,eucalyptus is prone to deformation,cracking and shrinkage,which seriously affects the process of wood utilization. Freeze?drying technology can improve the drying quality of Eucalyptus and reduce the shrinkage during drying. The temperature set during vacu?um freeze?drying is an important basic parameter. In this paper,the eutectic point and the melting point of Eucalyptus wood were studied by resistance method.The resistance values in the radial direction,chord direction and length direction of eucalyptus wood were measured respectively,and the temperature when the resistance value changed was recorded. The results show that:the eutectic points of Eucalyptus uro?phylla×E.grandis measured in this experiment was-8 ℃ and the melting point was-5.3 ℃. The eutectic points of Eucalyptus urophylla S.T. Blakely was-9℃ and the melting point was-5.7 ℃.

关 键 词：电阻法 桉木 共晶点 共熔点 冷冻干燥 

分 类 号：TS664[轻工技术与工程]