最新刊期
      期 0 ， 2020
      • Hao Bingje Liu Zhengtian
        Issue 2, Pages: 2-6(1993) DOI: 10.19455/j.mcgy.1993.02.001
        摘要：The curing processes of urea-formaldehyde(UF) resin, polydiphenylmethane diisocyanate (PMDI) and their mixtures were examined respectively by differential scanning calorimetry (DSC). Results showed that the reactions between the UF resin and PMDI occur at the temperature of 105～110℃. PMDI intensely reacts on water when the temperature reaches 120～125℃. However, the reaction activeties of PMDI is effected by the acidities of the medium. The lower the pH value of medium, the worse the reactiveness of PMDI.  
        关键词：Differential scanning calorimetry (DSC);Urea—formaldehyde resin;Polydiphenylmethane diisocyanate (PMDI)   
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        发布时间：2021-03-12
      • Wang Huafu Yuan Yisheng Zhou Yue
        Issue 2, Pages: 7-11(1993) DOI: 10.19455/j.mcgy.1993.02.002
        摘要：Seventeen formulations were tested for their efficiency in controlling mould and stain on 4 non-wood raw material particleboards according to their antimould power.Among the formulations, No. 8, 9, 7 and 6 are very perfect. The antimould power of particleboards treated with 4 formulations mentioned above, might be as good as that of Larix gmelini’s, but better than Cryptomeria fortunei’s, the antimould power of other particle boards made from bagasse, cornstalk and beanstalk treated with No. 9, are also effective.  
        关键词：particleboard;Antimould power;Mould;Sapstain;bamboo;Nonwood fiber;Index of performance.   
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        发布时间：2021-03-12
      • Issue 2, Pages: 11(1993) DOI: 10.19455/j.mcgy.1993.02.003
        摘要：<正> 根据国家技监局《关于发送“1989～1990年全国专业标准化技术委员会组建计划”的通知》,全国人造板标准化技术委员会于1992年底成立。该技委会由国家技监局委托林业部领导,归口管理全国人造板标准化工作。专业范围主要包括纤维板、  
          
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        发布时间：2021-03-12
      • Zhou Guanghua Ji Chengcao
        Issue 2, Pages: 12-18(1993) DOI: 10.19455/j.mcgy.1993.02.004
        摘要：The experiments both indoors and outdoors, on the freshly felled logs of the Chinese red pine （Pinus massoniana） with or without bark which are sprayed with chemicals to protect against decay and insect damage show that the better insecticides are Phoxin, Fenthion and Lindane; and the better wood preservatives are 6781, 6782, 6783, 6784, FCAP, AC3B etc. All of these preservatives are the water-borne. Being sprayed with 6781, 6782, the debarked pine logs are not degraded after storage outdoors for two years, and the quality of the wood keeps the same as the original.By dry storage indoors, it has the better result for the logs of hardwood （Liquidambar formosana and Alniphyllum fortunei） which are debarked and sprayed with chemicals, and it has the worse result to be stored outdoors.After dipping treatment on the fresh sawn-timber of hardwood （L. f. and A. f.） with 6782 preservative, it gives the better result in preventing mold and decay by dry storage indoors for one year.Rot occurs in all the control wood which degrades seriously and becomes substandard or useless after two years.  
        关键词：Chemical method;Freshly felled log;Sawn-timber;Dip-treatment   
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        发布时间：2021-03-12
      • Luo Jianju Xiang Shilong Fang Wenbin
        Issue 2, Pages: 19-22(1993) DOI: 10.19455/j.mcgy.1993.02.005
        摘要：The test results showed that the dimensional stability of UF prepolymer modified wood were improved notably compared with untreated wood. Furthermore, the treated wood was much harder than untreated wood.  
        关键词：Wood property improvement;Solution of urea-formaldehyde prepolymer;Wood dimensional stability   
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        发布时间：2021-03-12
      • Wang Zhitong
        Issue 2, Pages: 23-28(1993) DOI: 10.19455/j.mcgy.1993.02.006
        摘要：This report describes the research and exploration of characteristics of controlled objects, methods of process control, equipment and instruments for monitoring and measurimg, process controller and regulator and system in drying process of the Three-pass Dryers. The Three-pass Dryers is provided. with higher thermal efficiency and wood chip of uniform final moisture content and better shape is produced.  
        关键词：Drying of wood chip;Consumption of energy;Thermal efficiency;automatic control;Monitoring and measuring;Control and regulation   
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        发布时间：2021-03-12
      • Diao Jiaxiang
        Issue 2, Pages: 29-32(1993) DOI: 10.19455/j.mcgy.1993.02.007
        摘要：Test were made on hewing wood by changing factors of cutting tool and wood (workpiece), and possibilities of hewing wood into several pieces in one process by designing composed cutter were studied.  
        关键词：wood;Cleavability;HeWing conversion   
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        发布时间：2021-03-12
      • Issue 2, Pages: 33-36(1993) DOI: 10.19455/j.mcgy.1993.02.008
        摘要：<正> 前言据估计,全世界共有竹子70余属,1200余种,我国有34属,400余种,竹林面积340余万顷,竹材蓄积量7000余万吨,年产量500余万吨,竹材资源十分丰富。另一方面,竹林种植密度高,养护管理方便,生长快,素有“三年成林,四年成材”之说,经营得当可永续发展。竹材断面多呈圆形,中空,质地坚韧,富有弹  
          
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        发布时间：2021-03-12
      • Issue 2, Pages: 37-40(1993) DOI: 10.19455/j.mcgy.1993.02.009
        摘要：<正> 随着木材加工、家具制造和人造板生产的日益发展,木材粉粒性碎料的处理工作也随之剧增。为保护大气环境,特别是人口稠密的城市,国家对粉尘排放的规定会愈来愈严格。我国木材工业过去使用较多的旋风分离器因其本身性能的限制,已很难独立完成木粉的除尘工作。根据国内外应用的实际情况看,袋式除尘器具有良好的处理效果。本文着  
          
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        发布时间：2021-03-12
      • Issue 2, Pages: 41-43(1993) DOI: 10.19455/j.mcgy.1993.02.010
        摘要：<正> 木材、竹材是天然生物体,包含许多化学成分和微观结构,因此,它们的胶合作用受众多因素的影响。为了了解各个因子对最终胶合的影响程度,需要做系统的试验研究。本文测定了意杨和毛竹材的酸性,然后借助差热扫描量热仪、紫外分光光度计等仪器,研究了它们对酚醛树脂热反应特性和固  
          
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        发布时间：2021-03-12
      • Issue 2, Pages: 44-46(1993) DOI: 10.19455/j.mcgy.1993.02.011
        摘要：<正> 目前,我国胶合板需求量不断上升,但胶合板用材供需矛盾亦十分尖锐,特别是可生产面板材料的树种越来越少。即使引进柳安单板,面背板和芯板的搭配比例也不平衡。为了寻找新的胶合板面材,笔者应用澳大利亚白栎木作胶合板面材,进行  
          
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        发布时间：2021-03-12
      • Issue 2, Pages: 46-50(1993) DOI: 10.19455/j.mcgy.1993.02.012
        摘要：<正> 以膜片压机为代表的柔性加压技术在过去几年得到了飞速的进步,已开发出多种型式的膜片压机。木材和人造板的表面二次加工几乎一直只是贴面,三维加工主要是喷漆。由于MDF板在切割时一部分纤维被拉断和剪断,而使断面不光滑,同时由于刀具的热作用,使工件棱角粗糙,喷漆时,这种缺点表现明显。此外,用油漆方法在三维成型工件上很难实现装饰效果。因此人们希望能找到这样一种  
          
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        发布时间：2021-03-12
      • Issue 2, Pages: 51-54(1993)
        摘要：<正> 新型墙体材料——粉煤灰刨花板由中国林科院木工所新近研制成功的粉煤灰刨花板是以火电厂排出的废渣——粉煤灰为主要原料、以木材加工剩余物的工艺刨花为骨料,添加适当胶粘剂与助剂,经拌胶、铺装、热压而制成的一种新型建筑人造板材。与普通刨花板相比,该板材难燃,不起明火,离开火源即自熄;与纸面石膏板比,强度高、施工破损率低,耐水耐潮湿性能好。  
          
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        发布时间：2021-03-12
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