最新刊期
      期 0 ， 2020
      • ZHU Guang qian
        Issue 2, Pages: 1-7(2004) DOI: 10.19455/j.mcgy.2004.02.001
        摘要：The author reviewed China’s current wood resources and the market demands and concluded that the imports of timber and forest products played an important role in supplementing the wood supply in China. The trends of China’s wood supply and the demands of the domestic wood market in 2004 were also discussed. The author also provided suggestions for the sustainable deve lopment of wood industry in China.  
        关键词：Wood resources;Timber;Forest products;Import;Trend;Sustainable development   
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        发布时间：2021-02-08
      • WU Sheng fu
        Issue 2, Pages: 8-11(2004) DOI: 10.19455/j.mcgy.2004.02.002
        摘要：After several decades of development, the Chinese wood based panel industry has reached a high level of quality and production. But, simultaneous to this development have come problems. Problems plaguing the wood based panel industry that are addressed in this paper concern trade policy, material supply, product quality and processing techniques. The author appeals to the managers and manufacturers to pay attention to these problems and work toward resolving them.  
        关键词：wood based panels;plantation;Reasonable utilization   
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        发布时间：2021-02-08
      • FANG Kun 1,LIU Xiao 2,LI Jun 2,ZHAO Jing wei 2
        Issue 2, Pages: 12-14(2004) DOI: 10.19455/j.mcgy.2004.02.003
        摘要：In this study, the authors prepared an environmentally friendly and low toxicity powder phenol formaldehyde （PF） resin for plywood manufacturing. The resin was modified by adding some modifiers and other materials which were developed by the authors during the resin synthesizing process. They also discussed other influencing factors, such as temperature rate of rise and modifiers that affect the properties of the PF resin. According to the test results, the technical indices of the PF resin have met the minimum requirements of the Chinese National Standards GB 14732 93. Furthermore, the properties of plywood, glued by the modified PF resin, could meet the requirements of the Chinese National Standards GB/T 9846.1～12 88.  
        关键词：phenol formaldehyde resin;preparation;modification   
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        发布时间：2021-02-08
      • ZHOU Yu cheng,CHENG Fang,ZHAN Xin sheng,FAN Liu feng,AN Yuan
        Issue 2, Pages: 15-17(2004) DOI: 10.19455/j.mcgy.2004.02.004
        摘要：This paper discussed transformation and upgrading of digital control processing systems. Based on an analysis of current digital control lumber processing systems in China, both the problems and solutions were reviewed. Specific points that were covered included the design structure of the system, overall function, programming, network, and process operation. After upgrading and transformation, the digital control systems did not only maintain the original precision and function, but also had gained modern capabilities such as network communication, data transmission, CAD, CAM, and simulation, that made its function and performance meet the standards of modern science and technology.  
        关键词：Digital control systems;Upgrading and transforming;Design and implementation   
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        发布时间：2021-02-08
      • FEI Ben hua,JIANG Ze hui,ZHAO Rong jun,WANG Xi ming
        Issue 2, Pages: 18-20(2004) DOI: 10.19455/j.mcgy.2004.02.005
        摘要：Four species of plantation grown Eucalypt （ Eucalyptus urophylla,E. grandis×E. urophylla, E. urophylla×E. tereticornis and E. pellita ）, aged 3 to 5 years, were selected to determine their longitudinal growth strain. The plantations selected were in Leizhou district, Guandong Province, due to their good growing conditions. The test results indicated that the variance of growth strain among four species was significant. It also found that there was a linear correlation between the growth strain and diameter of E. urophylla×E. tereticornis. It is expected that the results will provide useful references for the processing and utilization of Eucalypt plantation wood.  
        关键词：Eucalypt plantation;Growth strain;processing and utilization   
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        发布时间：2021-02-08
      • ZHANG Li ping,LIU Jian
        Issue 2, Pages: 21-23(2004) DOI: 10.19455/j.mcgy.2004.02.006
        摘要：A new sorbent was developed by using Peach （ Prunus persica ） wood sawdust modified with epichlorohydrin, and its adsorption capacities for fuchsine basic and malachite green were evaluated. The optimum technologies for making the modified sawdust, as well as the optimal conditions for the modified sawdust to absorb fuchsine and malachite green from basic solutions, were determined by the orthogonal collocation method. Results showed that the modified sawdust could be used as an effective sorbent and this provided a new way of utilizing sawdust.  
        关键词：Peach sawdust;modification;Epichlorohydrin;Decoloration   
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        发布时间：2021-02-08
      • YU Hong wei,WEN Gui feng,ZHANG Hong
        Issue 2, Pages: 24-27(2004) DOI: 10.19455/j.mcgy.2004.02.007
        摘要：The authors studied the effects of the mole ratio of formaldehyde to phenol （F/P） and the dosage of additives including sodium hydroxide, urea and methyl glucoside on the properties of kenaf felt boards, Results indicated that: 1) The IB of kenaf felt boards could be improved by raising the F/P mole ratio and the dosage of sodium hydroxide, whereas it decreased with the increase of urea, and it was little influenced by methyl glucoside to a certain degree. 2) The TS of kenaf felt boards declined with an increase in the F/P mole ratio. However, it increased while adding sodium hydroxide, urea and methyl glucoside. 3) The optimal concentration of urea was less than 4% of the amount of resin, the mole ratio of F/P and NaOH/P was 2.0 and 0.06 respectively, and the ratio of methyl glucoside to phenol should be less than 4%.  
        关键词：phenol formaldehyde resin;Kenaf felt board;Internal bond strength;Thickness swelling rate of water   
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        发布时间：2021-02-08
      • WANG Ya mei 1,LIU Jun liang 2,WANG Xi ming 1
        Issue 2, Pages: 28-29(2004) DOI: 10.19455/j.mcgy.2004.02.008
        摘要：Bamboo, as the second largest forestry resource in China, has been playing an important role in saving forest resources and supplying the demands for wood products. However, bamboo and products made from bamboo, are easily affected by insects, mildew, and fungi under high temperature and humidity conditions due to abundant glucide and protein. Preservation treatment for bamboo has been verified as an effective preventive measure against fungi. This paper reviewed research on preservatives and preservation methods for bamboo, and analyzed the current conditions as well as emerging technology. Some new high efficient, low toxicity and environmentally friendly preservatives and treating technologies were recommended.  
        关键词：bamboo;Preservation technique;Preservative   
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        发布时间：2021-02-08
      • XIE Yong qun 1,CHEN Yan 1,ZHANG Bi guang 2
        Issue 2, Pages: 30-32(2004) DOI: 10.19455/j.mcgy.2004.02.009
        摘要：Theoretical and experimental research on a foamed material from plant fibers was conducted. Results showed that all the chemical and physical properties of the foamed material were affected by the distribution and size of the bubbles. Plant fibers freely joined each other forming a three dimensional structure as a result of the tension and force of the bubbles. At the same time, the tri dimensional structure was further strengthened by the action of an adhesive and a surface activating agent.  
        关键词：Plant fiber;Foam;Packing material;Bubble   
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        发布时间：2021-02-08
      • SHI Zhen hua,JIN Zhong wei,ZHANG Zu xiong
        Issue 2, Pages: 33-35(2004) DOI: 10.19455/j.mcgy.2004.02.010
        摘要：China has been importing a large amount of Mongolian Scotch Pine （ Pinus sylvestris var. mongolica ） logs and lumber from Russia for several years. Since Mongolian Scotch Pine is easily infected by mold and sapstain fungi, a preservative, TBQ, was prepared following development of the treating equipment by the authors. A series of experiments were conducted to determine the effectiveness of TBQ treated lumber. Results showed that the TBQ treated lumber could be well protected from mold and sapstain, and their antimold and anti stain effectiveness could reach 98% after being immersed in TBQ solution with concentration of 6% for 1 hour. The authors suggested that Mongolian Scotch Pine logs or lumber should be treated immediately after logging or sawing. It is necessary to set up treating equipment near logging spots or import ports before the wood are transported long distance to domestic wood markets.  
        关键词：Mongolian Scotch Pine;Antimold;Antisapstain;TBQ wood preservative   
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        发布时间：2021-02-08
      • MO Yin hui
        Issue 2, Pages: 36-38(2004) DOI: 10.19455/j.mcgy.2004.02.011
        摘要：Linear deformation as a function of moisture content （ MC ） was investigated on the bottom layer of 3 layer parquet. A single factor experimental method was used for this study. The test results showed that both too high and low MC of the bottom layer could cause deformation of a parquet panel. Based on the test data, the author found that the suitable MC for the bottom layer was 8%12% and the MC value should be according to the density and species of the parquet. Moreover, softwood veneer was more suitable for the bottom layer for parquet than hardwood. Processing measures to control the MC of the bottom layer were presented.  
        关键词：Back layer;Moisture content （ MC ）;3-layer parquet;Deformation   
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        发布时间：2021-02-08
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