最新刊期
      期 0 ， 2020
      • CHEN Lei 1,XU Yong lan 2
        Issue 6, Pages: 3-5(2000) DOI: 10.19455/j.mcgy.2000.06.001
        摘要：The paper deals with possibility of manufacturing laminated veneer lumber (LVL) from small logs of plantation Chinese Fir (Cunninghamia lanceolata). The effects of three factors, i.e., hot pressing temperature, hot pressing time and pressure, were analyzed by means of the mathematical model- "Quadratic Orthogonal Rotable Combination Design". The optimum technological parameters were determined and the results showed that properties of LVL from plantation Chinese Fir meet the requirements of the highest rank of the Japanese Agricultural Standards (JAS).  
        关键词：Plantation Chinese Fir;Laminated veneer lumber (LVL);Manufacturing technolo?   
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        发布时间：2021-03-12
      • SUN Feng wen
        Issue 6, Pages: 6-8(2000) DOI: 10.19455/j.mcgy.2000.06.002
        摘要：The preparation of powder larch (Larix) tannin phenol formaldehyde (TPF)adhesive and technology of hot pressing of plywood were studied. The results demonstrated that the ideal mixing ratio of powder TPF and water was 10∶9 by weight and the bonding strength was improved after laying the blended liquid adhesive for 24 h. Adding flour by 5 % or 5 % of flour together with 5 % of wood powder can strengthen the bonding strength of plywood. The optimum parameters of Masson’s Pine ( Pinus massoniana ) plywood manufacturing technology by using TPF adhesive were as following: moisture content of veneer 7%~8%, resin consumption 275 g/m 2 for double sides, veneers assembly time about 1 h, hot pressing temperature as 140 ℃, hot pressing time as 0.9 min/mm of thickness for general plywood and hot pressing pressure as 1.0~1.2 MPa.  
        关键词：Tannin-phenolformaldehyde (TPF) adhesive;bonding strength;Bonding technology;plywood   
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        发布时间：2021-03-12
      • HU Ji qing 1,JIANG Xiao mei 2,HOU Zhu qiang 2,YIN Ya fang 2
        Issue 6, Pages: 9-11(2000) DOI: 10.19455/j.mcgy.2000.06.003
        摘要：The trees from plantation Eucalyptus leizhou No1, E. citriodora and E. urophylla, were selected to study. The measurements of longitudinal growth strains of standing trees were conducted for three Eucalyptuses in different age, and the measurement of some parameters of green wood property also was done for them. The analysis showed: the effects of fell and height of trees on growth strains were negligible; the variance of growth strains among three species and in different age within a species was significant, but the variance trend was different. There was significant correlation between growth strains and breast height diameter of trees, but no significant correlation between growth strains and wood basic density.  
        关键词：Growth stress;Growth strain;Plantation Eucalyp?   
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        发布时间：2021-03-12
      • QIN Te fu
        Issue 6, Pages: 12-14(2000) DOI: 10.19455/j.mcgy.2000.06.004
        摘要：Surface chemical construction changes of Chinese Fir ( Cunninghamia lanceolata ) and Poplar "Sanbei No.1"( Populus nigra×P.simonii ) treated with acetyloide were studied by using ESCA analysis. The results showed that there were great differences of surface chemical characteristics between Chinese Fir and Poplar. In the surface of Chinese Fir, the ratio of carbon atom was higher than that in Poplar, but the ratio of nitrogen atom and oxygen atom was lower than that in Poplar. Furthermore, there was calcium atom in the surface of Poplar. After reaction with acetyloide, the surface chemical characteristics of wood had been changed ; the ratio of O-C=O structure (carbon of carboxyl and ester) was increased.  
        关键词：Wood acetylization;Surface chemical characteristic;EH   
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        发布时间：2021-03-12
      • LI Shu jun,JIN Zhong yue,FANG Gui zhen
        Issue 6, Pages: 15-17(2000) DOI: 10.19455/j.mcgy.2000.06.005
        摘要：During low mole weight PF resin composed with fire retardant FRDL 112 or H 3BO 3 modified Poplar( Populus ussuriensis ) wood, the liquid added FRDL 112 impregnates wood much easier than that added H 3BO 3 does. H 3BO 3 influents on the anti swelling or shrinkage and moisture excluding properties of PF modified wood worse than FRDL 112 does. The addition of FRDL 112 weakens the compressive strength parallel to grain and hardness of PF modified wood, but the properties are still stronger than those of untreated wood. According to the result of fire retard experiment, FRDL 112 is much better than H 3BO 3. The addition of FRDL 112 influents badly on the antiseptic property of modified wood with PF resin. The antiseptic property of modified wood with PF resin and H 3BO 3 is better than that of modified wood with PF resin but H 3BO 3 is leachable.  
        关键词：Low mole weight PF resin;Fire retardant;Boric acid;Composition;Modified wood   
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        发布时间：2021-03-12
      • SUN You fu,NI Ma la mu
        Issue 6, Pages: 18-20(2000) DOI: 10.19455/j.mcgy.2000.06.006
        摘要：Various factors affecting sawn lumber, such as the growth stresses, reaction wood, swelling and shrinking drying stresses, cross grain, temperature and loading etc., have been analyzed and discussed. It provides the base of theory for studying and controlling the deformation of sawn lumber.  
        关键词：Lumber deformation;Affecting factors;Mechanism analyse\   
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        发布时间：2021-03-12
      • YANG Cheng
        Issue 6, Pages: 21-24(2000) DOI: 10.19455/j.mcgy.2000.06.007
        摘要：In this article, the control system of traditional hot presses made in China and its dis advantage was described briefly. Meantime, the actuality situation and development of control systems of single opening presses both homebred and imported were analyzed. For improving the system, the possibility of using proportional closed loop (PCL) to replace the servo system as control system for hot press was discussed.  
        关键词：Wood based panels;Hot press;PCL control system   
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        发布时间：2021-03-12
      • LUO Zhao hui,ZHU Jia qi,HUANG Ze en
        Issue 6, Pages: 25-27(2000) DOI: 10.19455/j.mcgy.2000.06.008
        摘要：Methods of manufacturing wood / metal composite materials which have characters of electromagnetic wave shielding and electrostatic discharge protection were reviewed in this paper. Meanwhile, some experiment results were also given.  
        关键词：Wood/Metal composite material;Electromagnetic wave shielding;Electrostatic discharge protectioH   
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        发布时间：2021-03-12
      • Issue 6, Pages: 28-29(2000) DOI: 10.19455/j.mcgy.2000.06.009
        摘要：采用几种常用涂料外部涂饰的方法 ,进行定向结构板防水效果的试验。结果表明 :板材经外部涂饰处理后 ,防水效果均有所提高 ,但各种涂料间存在差异 ,其中以聚氨酯漆的防水效果最好。  
        关键词：定向结构板;涂料涂饰;防水性能   
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        发布时间：2021-03-12
      • JI Yang hong 1,LIU Yong dan 2,GUO Xiao jun 2
        Issue 6, Pages: 30-32(2000) DOI: 10.19455/j.mcgy.2000.06.010
        摘要：In order to expand wood source of plywood for container flooring, the manufacturing technology of plywood made by Keruing ( Dipterocarpus spp.), Birch ( Betula ) and Kapur ( Dryoba lanops ) as surface material and other species of hardwood from Southeast Asia as core material was studied. The results showed that the physical and mechanical as well preservative properties of the flooring plywood manufactured according to the technical parameters indicated by this study, were able to meet the demands of relative standards both in home and abroad.  
        关键词：plywood;Container flooring;Manufacturing technolo?   
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        发布时间：2021-03-12
      • HUANG Ming,QIU Wei jian,DING Ke
        Issue 6, Pages: 33-34(2000) DOI: 10.19455/j.mcgy.2000.06.011
        摘要：The status and the prospects of applying PLC in the full cell process and alternating pressure process(APP) were discussed. The inter lock relationship between PLC and the quick opening door was also reviewed.  
        关键词：PLC;Wood preservation;Equipment   
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        发布时间：2021-03-12
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