最新刊期
      期 0 ， 2020
      • WU Zhang kang 1,ZHOU Ding guo 2
        Issue 3, Pages: 3-5(2002) DOI: 10.19455/j.mcgy.2002.03.001
        摘要：The feasibility of medium density fiberboard （MDF） manufactured from rice straw with urea formaldehyde （UF） resin was investigated and the effects of board density, resin consumption and water repellent on properties of the board were also studied. Results showed that the properties of rice straw MDF with UF resin could meet the requirement of GB/T 11718 1999 when the board density was 0.8 g/cm 3 and resin consumption equaled 17%. Thickness swelling of board was improved greatly when water repellent was added at 1.2%.  
        关键词：UF resin;Rice straw;MDF   
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        发布时间：2021-02-08
      • YANG Xiao jun,CAO Zhong rong,QU Yan chun
        Issue 3, Pages: 6-8(2002) DOI: 10.19455/j.mcgy.2002.03.002
        摘要：By orthogonal test and statistical analysis,as well as checking and tracing tests, a study on the manufacturing technology of exterior medium density fiberboard （MDF.E） from Chinese Fir （ Cunninghamia lanceolata） had been conducted. Results indicated that Chinese Fir could be a good raw material for manufacturing exterior medium density fiberboard;under the processing parameters of glue consumption 13%, density of board 0.88 g/cm 3, hot pressing temperature 175 ℃ and hot pressing time 6 min, the properties of the 9 mm thickness sample board made in laboratory could reach the requirement of MDF National Standard.  
        关键词：Chinese Fir;Exterior medium density fiberboard;Manufacturing technology   
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        发布时间：2021-02-08
      • SHAO Zhuo ping
        Issue 3, Pages: 9-11(2002) DOI: 10.19455/j.mcgy.2002.03.003
        摘要：It was the multi unit combined spring and damp model that was widely used to study rheological properties of wood material, but its some constant coefficients were not easily solved. In this paper, a concept of variation coefficient rheological model was put forward, which adopted two unit Maxwell body of variation coefficients to simulate the creep behavior of medium density fiberboard （MDF）. Results showed that the model could be effectively used to fit the creep of the MDF, and easily to seek the rheological coefficients because of its fewer units of combination modulus of spring damper. The author also indicated that the model could fit the creep of MDF on changing load with Boltzmann superposition principle.  
        关键词：medium density fiberboard;creep;Maxwell Body;Variation coefficient   
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        发布时间：2021-02-08
      • HAN Shu guang,LIU Qi ming,DU Yi cheng
        Issue 3, Pages: 12-14(2002) DOI: 10.19455/j.mcgy.2002.03.004
        摘要：The urea formaldehyde （UF） resin for plywood was modified with melamine and polyvinyl alcohol （PVA）. The effects of modified UF resin makings including final molar ratio, quantity of melamine, PVA and final temperature, and property indexes including viscosity, solid content and free formaldehyde content on prepressing intension of assembled mat were studied. Results showed that larger quantity melamine had no advantage of improving the prepressing intension, and PVA could help to increase original viscosity obviously, but the original viscosity could not determine the prepressing intension. The high temperatures of final reaction and short curing time were good for the prepressing intension, but prepressing intension decreased with solid content of resin increased. The low free formaldehyde content had little effect on prepressing intension.  
        关键词：Melamine urea formaldehyde resin （MUF）;Prepressing intension   
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        发布时间：2021-02-08
      • NA Bin,ZHOU Ding guo
        Issue 3, Pages: 15-18(2002) DOI: 10.19455/j.mcgy.2002.03.005
        摘要：The experiments on fire retardant PF （phenol formaldehyde） resin adhesive for particleboard and panel manufacturing technology were done. Results showed that the physical and mechanical properties of panel could reach the requirement of high A class particleboard in accordance with the national standard of GB/T 4897 92, and the Oxygen Index （OI） were above 37, which reached the national standard of GB 7911.6 87 for decorative laminated sheets based on thermosetting resins.  
        关键词：particleboard;Fire retardant;Phenol formaldehyde resin adhesive   
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        发布时间：2021-02-08
      • ZHAO Rong jun 1,LI Jian 2,FANG Gui zhen 2,LI Shu jun 2
        Issue 3, Pages: 19-21(2002) DOI: 10.19455/j.mcgy.2002.03.006
        摘要：The 4 common wood species, Pinus koraiensis, Abies nephrolepis, Fraxinus mandshurica and Betula platyphylla , growing in north part of China were selected and effects of the wood extraction component on mammal growth were analysed. Results indicated that some extraction from Pinus koraiensis and Betula platyphylla wood can play a medicine and health protection role. They have good regulating function to mammal growth.  
        关键词：wood;Extraction component;Mammal   
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        发布时间：2021-02-08
      • YU Gang,XIANG Zhong hua,JIANG Chang zheng
        Issue 3, Pages: 22-25(2002) DOI: 10.19455/j.mcgy.2002.03.007
        摘要：The processing method and properties of plastic agricultural and forestry byproducts composites were discussed. Furthermore, how to control and modify the interface between filler and matrix to improve the characteristic properties of composites were labored.  
        关键词：Agricultural and forestry byproducts;Thermoplastic;composite;Interface   
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        发布时间：2021-02-08
      • YE Xian wen,LI Jun ying,ZHAN Zhou yan,CHEN Shun qing
        Issue 3, Pages: 26-27(2002) DOI: 10.19455/j.mcgy.2002.03.008
        摘要：With engineering examples, the authors analyse the application of gypsum fiberboard to building. Comparing with traditional compact clay brick, which is limited to use, the gypsum fiberboard has a wide future in the building materials market.  
        关键词：Gypsum fiberboard;Brick partition;Unit cost   
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        发布时间：2021-02-08
      • HAN Yu jie 1,ZHU Guo xi 1,Chiaki TANAKA 2
        Issue 3, Pages: 28-29(2002) DOI: 10.19455/j.mcgy.2002.03.009
        摘要：This paper presentes an on line method for detecting crack and knot of planed lumber surface. The system is consisted of a laser sensor which provides scanning signal, a FFT analyser which records a curve and a personal computer which analyses and processes data from FFT analyser. The system could not only distinguish crack and knot of wood surface quickly and accurately, but also calculate size of each defect according to the data from record curve.  
        关键词：Laser;On line detect;Wood surface defect   
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        发布时间：2021-02-08
      • MOU Hua kun,LU Hui
        Issue 3, Pages: 30-32(2002) DOI: 10.19455/j.mcgy.2002.03.010
        摘要：In the article, the structure and characteristics of WDCS 4 wood dryer controlling system were briefly presented. Furthermore, the measures to reinforce anti disturbance performance for the system and improve wood drying quality were also reviewed.  
        关键词：wood drying;Controlling system;drying quality   
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        发布时间：2021-02-08
      • HE Qing hao
        Issue 3, Pages: 33-36(2002) DOI: 10.19455/j.mcgy.2002.03.011
        摘要：By comparison between metal shell wood drying kiln and brick concrete wood drying kiln, the loss of heat energy of metal shell wood drying kiln was analyzed. Then, the severe degree of loss of heat energy caused by cold bridge of entrance gate frame and jamb were illustrated emphatically. Finally, some efficient ways to reduce the loss were pointed out.  
        关键词：wood drying kiln;Loss of heat energy   
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        发布时间：2021-02-08
      • TIAN Wei guo
        Issue 3, Pages: 37-38(2002) DOI: 10.19455/j.mcgy.2002.03.012
        摘要：In this article, the author discussed how to control the quality of the overlaid wood based panels with papers impregnated melamine resin during processing. It also analysed the causes of common production problems and some resolving measures.  
        关键词：Overlaid wood based panels;Papers impregnated melamine resin;quality control   
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        发布时间：2021-02-08
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