木材含水率测试技术水平及其前景

木材含水率是影响木材性质和使用的重要因素。准确而迅速地测试木材含水率一直是重要的研究课题。目前使用的各种测试方法依据的原理不同,其应用范围和受环境因素(例如温度、树种、电源等)影响的程度也不同。本文对常用的电阻法和电容法受温度、密度、树种等影响的情况进行了对比分析,指出了木材含水率测试技术的发展趋势,并介绍了我国在木材含水率检测方面开展科研工作及推广应用的情况。

The Levcl and Outlook of Technical Test of the Moisture Content of Wood

Certain physical properties of wood such as dc-resistance,and de-electric constant are measured.From the correlation of the physical quantities withthe moisture content of wood is derived the moisture content(%) of wood.Onbasis of these researches,different testing methods and different testing instru-ments are developed.Understanding the principle of various testing methods andthe scope of their application as well as effective control of the factors influencingtheir accuracy are all necessary in order to obtain satisfactory results.Up to now,lots of results have been obtained in researches on the wood moisture contenttesting.The testing instruments so developed have been applied to production infactories.The condenser type and resistor type testing instruments for wood mois-ture content have been being used.Lk-1 control system in drying room is devel-oped by the Rcsearch Institute of Wood Industry of the Chinese Academy of For-estry.The system can determine the moisture content of check board in the stack,and can control thc process of drying by feedback,thus shortening the drying timeand reducing energy consumption and wood degradation.With its effect beingproved,its use is extended.The theoretical research on wood moisture contenttesting is not enough in depth,and the relation between all factors have not beenwell clarified.So wood moisture content testing is still a priority researchsubject.Henceforwards,with increasing depth of theoretical research,develop-ment of electronic and computer technology,promotion of wood processing in-dustry,the testing technique of wood moisture content will be continually im-proved and the functions of testing instruments will be gradually perfected.Its accu-racy and level of intelligence will be upgraded step by step.