最新刊期
      期 0 ， 2020
      • Zhu Zhengxian Zhang Yichun
        Issue 1, Pages: 1-6(1989) DOI: 10.19455/j.mcgy.1989.01.001
        摘要：Vacuum drying can result in reduced drying time and higher drying quality. This method is Worthy of studying further and spreading in certain area. The development of a wood vacuum drying technology has been discussed. The results of tests show that this kind of dryer is rationable in design and has good function, can meet the demand of scientific research on drying and small-scale production. Through the experiments. vacuum drying schedules of elm, Japanes ash, birch and basswood are worked out.  
          
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        发布时间：2021-03-12
      • Hua Yukun Wang Siqun
        Issue 1, Pages: 7-11(1989) DOI: 10.19455/j.mcgy.1989.01.002
        摘要：The purpose of this paper is to study effects of accelerated-aging tests on properties of urea resin-bonded particleboard and phenolic OSB. The results of accelerated-aging tests shown that the mechanical properties of urea resinbonded particleboard decreased and the water-absorbing thickness swelling increased. The APA D-5 test among 5 accelerated-aging tests has the largest effect on properties of urea resin-bonded particleboard. The accelerated-aging tests have larger effect on MOE of particleboard and OSB than on MOR.  
          
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        发布时间：2021-03-12
      • Zhang Souhuai Zhang Wenqing Zhang Lihua
        Issue 1, Pages: 12-18(1989) DOI: 10.19455/j.mcgy.1989.01.003
        摘要：In order to make comparison between different loading methods (according to Chinese GB and ISO), Timbers of Korean pine and six other species were chosen. The results shown that there is no significant difference in the tests of tensile and compression strength parallel to grain, bending strength, and stress at proportional limit in compression perpendicular to grain, but the MOE values of ISO method are 20.5-28.8% higher than that of Chinese GB.In addition to the above methods, another method was involved in the tests of compression strength parallel to grain with loading speed at a constant distance of the crosshead movement per unit time. No significant difference was shown, provided that wood failure occured within 2 minutes.  
          
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        发布时间：2021-03-12
      • Zhang Qun
        Issue 1, Pages: 19-26(1989) DOI: 10.19455/j.mcgy.1989.01.004
        摘要：The unloading curvature and the formulas of calculating the related parameter was obtained from the results of observation, measurement and analysis in production site and lab, which can be applied to eliminate the "blister" and other defects during pressing, The commonly used unloading systems, these design methods and the development of formulations, were described briefly.  
          
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        发布时间：2021-03-12
      • Issue 1, Pages: 26-28(1989) DOI: 10.19455/j.mcgy.1989.01.005
        摘要：<正> 我国林业面临资源危机、森林采伐量超过生长量、资源赤字增加、同时木材供需矛盾紧张、国家不得已大量进口木材及木制品的严峻局面。随着我国经济建设的发展,人口增长和生活水平的提高,今后木材供不应求的趋势,将越来越突出。如何减  
          
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        发布时间：2021-03-12
      • Issue 1, Pages: 29-31(1989) DOI: 10.19455/j.mcgy.1989.01.006
        摘要：<正> 一、我国中密度纤维板工业建设概况我国中密度纤维板工业是从1979年开始建设的,迄今已进入第九个年头。现就当前中密度纤维板厂的建设与生产以及产品销售情况,简述如下:  
          
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        发布时间：2021-03-12
      • Issue 1, Pages: 32-34(1989) DOI: 10.19455/j.mcgy.1989.01.007
        摘要：<正> 制材产品质量和出材率都是衡量制材企业经济效益的重要技术指标。随着企业改革的不断深入,对如何通过提高制材产品质量和出材率,达到提高经济效益的目的,被越来越多的制材企业所重视。科技工作者已经探索和总结出了不少行之有效的工  
          
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      • Issue 1, Pages: 35-39(1989) DOI: 10.19455/j.mcgy.1989.01.008
        摘要：<正> 一、人造板生产概况1.世界人造板生产概况世界各类人造板的生产量(见表1)表明: (1) 20年来世界人造板在不断发展,年增长率4.88%; (2) 胶合板仍占有很大的比重;  
          
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        发布时间：2021-03-12
      • Issue 1, Pages: 40-43(1989) DOI: 10.19455/j.mcgy.1989.01.009
        摘要：<正> 速生丰产林木材和间伐材的合理利用是当今国内外木材工业面临的重大课题。近年来,澳大利亚等国开发的重组木(Scrimber)问世,为小径材的加工利用开辟了一条新路,引起世界各国的关注,我国亦甚感兴趣。兹简要介绍如下。  
          
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      • Issue 1, Pages: 43-47(1989) DOI: 10.19455/j.mcgy.1989.01.010
        摘要：近十年来,探测木材缺陷的方法发生了显著的变化。本文综述了八十年代探测木材缺陷的新技术、新方法。主要有:激光扫描法,荧光扫描法,超声波法,X—射线法,X—射线荧光探测法,微波法,核磁共振法和红外光谱法。其中,以能探测木材内部缺陷的超声波法和X—射线法最有前途。一种有效的木材缺陷的探测方法是提高木材加工行业经济效益的有力工具。  
          
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        发布时间：2021-03-12
      • Issue 1, Pages: 47-51(1989) DOI: 10.19455/j.mcgy.1989.01.011
        摘要：<正> 电子计算机始于本世纪四十年代。早期的电子计算机体积庞大、耗能多。1943—1946年,美国宾夕法尼亚大学制作的计算机由18,000只真空管组成,耗电200KW,重量达30吨,每年大约有19,000次故障。1948年,晶体管取代了真空管,使电子计算机的体积和造价大大降低。60年代初期开始生产  
          
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        发布时间：2021-03-12
      • Issue 1, Pages: 52-56(1989) DOI: 10.19455/j.mcgy.1989.01.012
        摘要：<正> 木工刀具在切削过程中由于种种原因会磨损变钝是众所周知的。然而磨损和变钝这两个不同概念常常被混淆。其实,磨损指的是刀具切削部分的材料由于切削过程中磨蚀而造成的损耗;变钝则指的是刀具切削性能的恶化,表现为进给困难、切削温  
          
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        发布时间：2021-03-12
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