最新刊期
      期 0 ， 2020
      • JIANG Jia-li,LU Jian-xiong
        Issue 2, Pages: 4-7(2005) DOI: 10.19455/j.mcgy.2005.02.002
        摘要：Studies on wood drying stresses are very helpful to further the science of wood drying, establish suitable kiln schedules and improve the quality and economics of the wood drying process. Many scientists have studied different aspects in the field of drying stresses and developed numerical calculations for their results. This paper reviewed and summarized the typical study methods and made some comments and suggestions for further studies.  
        关键词：wood drying;Drying stresses   
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        发布时间：2021-02-08
      • GUO Wen-jing~1,WANG Zheng~1,KUROSU Hiroshi~2
        Issue 2, Pages: 8-11(2005) DOI: 10.19455/j.mcgy.2005.02.003
        摘要：Three kinds of plastics, linear low-density polyethylene（LLDPE）, polypropylene（PP） and polystyrene（PS）, were chosen to prepare the wood/plastic composites at two proportions of 25︰75 and 40∶60. The effects of different plastics on the properties of the wood fiber-plastic composites are evaluated though testing and comparing physical and mechanical properties. The results indicated that the compounding property of LLDPE with wood fiber was the best and its composite also showed good impact resistance, but its flexural strength and modulus were the lowest. For the wood fiber-PS composite, the flexural strength and modulus were excellent, but the impact resistance and the compounding property of PS with wood fiber were poor. On the whole, the properties of the wood fiber-PP composite were superior to the other two. Based on these results, the authors suggest that it is very necessity to develop blends of low-density polyethylene and polystyrene to be used for wood/plastic composites.  
        关键词：Wood/plastic composite;Wood fiber（WF）;property   
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        发布时间：2021-02-08
      • ZHANG Xian-quan,LIU Yi-xing
        Issue 2, Pages: 12-16(2005) DOI: 10.19455/j.mcgy.2005.02.004
        摘要：The ratio of steel fiber and wood fiber in a composite MDF, which could be used as electromagnetic shielding material, was studied in this paper. The results showed that steel fiber mixed with wood fiber can cause a negative effect on bonding strength of the composite MDF board, but a certain amount of PMDI resin applied on the steel fiber can significantly improve the board properties. The steel/wood fiber ratio and the mixed fiber position in the MDF also showed an effect on the electromagnetic shielding property of the board. The composite MDF had good electromagnetic shielding effectiveness with values beyond 55 dB at a steel/wood fiber ratio of 3∶1 and the steel/wood composites on the top and bottom surfaces of the MDF.  
        关键词：wood fiber;Steel fiber;Composite MDF;ESE（Electromagnetic shielding effectiveness）   
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        发布时间：2021-02-08
      • GAO Li~1,WANG Zheng~2,GUO Wen-jing~2,ZHANG Shuang-bao~1
        Issue 2, Pages: 21-24(2005) DOI: 10.19455/j.mcgy.2005.02.006
        摘要：The residues from two typical sympodial bamboos （Dendrocalamus giganteus and D. membranaceus） from Yunnan Province were selected to make molded particleboards. The molding technology included two steps, first prepressing and then hot pressing. The molded bamboo particleboards were then analyzed for the effects of bamboo species, glue consumption and mat density. Results confirmed that the two-step molding process was suitable for manufacturing molded bamboo particleboard. The performance properties of this particleboard were better than the molded particleboard made from Acacia under the same processing conditions. The results demonstrated a practical processing technology and reference for further sympodial bamboo utilization, such as decorative panel manufacturing.  
        关键词：bamboo;Acacia;particleboard;Molding process;Technological variables   
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        发布时间：2021-02-08
      • YAN Ping~1,CAO Wei-wu~1,QIAN Shang-yuan~1,SHI Sheng-hui~2
        Issue 2, Pages: 25-27(2005) DOI: 10.19455/j.mcgy.2005.02.007
        摘要：The authors of this paper developed an automatic rotary-air circulating system for wood-drying kilns to overcome the defects of conventional drying systems. The defects this new equipment corrects are low kiln efficiency and uneven air flow. The system is called SUES （Shanghai University of Engineering Science） and the authors have described the construction and working principle in this paper. A practical demonstration showed that, in comparison with a conventional air supplying system for a same size kiln （50 m3）, the one equipped with SUES system not only could cut down the drying cost and kiln operating cost, but also could save 60% electricity consumption and shorten drying period for about two days with better drying quality. The system has obtained patent authority.  
        关键词：Wood-drying kiln;Auto-rotary fan;Air supplying system   
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        发布时间：2021-02-08
      • LI Gai-yun,QIN Te-fu,HUANG Luo-hua
        Issue 2, Pages: 28-31(2005) DOI: 10.19455/j.mcgy.2005.02.008
        摘要：The experiments of Poplar （Populus×euramericana cv.‘I-214’） and Chinese Fir（Cunninghamia lanceolata） wood flour liquefied in the presence of phenol under sulfuric acid catalysis were conducted. The effects of reaction time and reaction temperature on the wood liquefaction were investigated. By means of gel permeation chromatography（GPC） analysis, the molecular weights of liquefied wood under different reaction conditions were measured to trace the change in the structural characteristics of the liquefied wood. The insoluble residues were analyzed by Fourier transform infrared to investigate the liquefaction order of three main wood components. The results showed that 1) the liquefaction curves for the Chinese Fir and Poplar were similar in general. The acidic catalyst showed a function not only on cellulose and hemicellulose, but also on lignin. 2) The reaction temperature had the greater influence on the residue content than reaction time. Both reaction temperature and reaction time could affect the molecular characteristics of liquefied wood. The weight-average molecular weight of liquefied Chinese Fir was higher than that of liquefied Poplar under most of the reaction conditions. 3) During wood liquefaction, lignin and hemicellulose were liquefied first and cellulose being the most difficult to liquefy. The decomposition, phenolation and recondensation of wood components are three main reactions which dominated the whole liquefaction dynamic process and determined the structural characteristics of liquefied wood.  
        关键词：Liquefied wood;Phenolation;Fourier transform infrared;Gel permeation chromatography（GPC）   
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        发布时间：2021-02-08
      • LIU Ying-tao,LIU Yi-xing,LI Jian
        Issue 2, Pages: 32-34(2005) DOI: 10.19455/j.mcgy.2005.02.009
        摘要：The differences in mechanical properties between juvenile and mature wood of Korean Pine （Pinus Koraiensis） from plantation and natural forest were analyzed. A basic tendency exhibited by all of the properties was: the properties index of mature wood were much better than that of juvenile wood. The difference in MOE of plantation Korean Pine reached 0.01 level of significance while MOR and tangential crushing strength reached 0.05 level of significance. The difference in MOE of natural Korean Pine also reached 0.01 level of significance and MOR, radial crushing strength, hardness of cross section and tangential crushing strength reached 0.05 level of significance.  
        关键词：plantation;Natural forest;Korean Pine;Juvenile wood;Mature wood;mechanical property   
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        发布时间：2021-02-08
      • WU Yu-zhang
        Issue 2, Pages: 35-38(2005) DOI: 10.19455/j.mcgy.2005.02.010
        摘要：In this study, the burning behaviors of three species of plantation wood （Cunninghamia lanceolata, Pinus massoniana and Populus euramericana cv.‘I-214’）, respectively treated with two retardants, boride （H3BO3∶Na2B4O7=1∶1 ） and ammonium primary phosphate, were all tested by cone calorimeter. The fire retarding effect of these retardants was evaluated by comparing the burning indexes of these three treated wood species, such as ignition time, mass loss rate, heat release rate, total heat released and total smoke production. It was found that the boride fire-retardant had poorer results in inhibiting ignition, heat release and mass loss in wood than the ammonium primary phosphate, but it was more effective than the latter in hindering smoking. These differences were analyzed and related with the retarding mechanisms of the two retardants.  
        关键词：Burning behavior;Plantation wood;cone calorimeter;boride;Ammonium primary phosphate   
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        发布时间：2021-02-08
      • XING Jia-qi
        Issue 2, Pages: 39-42(2005) DOI: 10.19455/j.mcgy.2005.02.011
        摘要：Three kinds of preservatives, Tanalith CuAz, Tanalith CY and Totim B, being free of chromium and arsenic, are now widely used abroad as environmentally-friendly wood preservatives. Their popularity has been increasing due to their nontoxic components to humans and animals. This paper reports the first laboratory evaluation in China against decay fungi, moulds and termites for these three foreign wood preservatives. The results show that both Tanalith CY and Totim B can effectively prevent wood decay with a low retention level; the preservative effects of Tanalith CuAz to decay fungi increases dramatically by increasing its retention level. Tanalith CuAz and Totim B also have excellent resistance to termites and moulds on wood respectively.  
        关键词：Preservative;Anti-decay;Antimould;Anti-termites   
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        发布时间：2021-02-08
      • JIANG Ming-liang
        Issue 2, Pages: 43-45(2005) DOI: 10.19455/j.mcgy.2005.02.012
        摘要：The wood preservation industry in China is facing some urgent problems. Some of the most critical issues dealing with wood preservatives are reviewed here and include: toxic and environmental problems, the importance of preservative registration, the manipulation of the current registration system and treated wood quality control. The author concludes with some suggestions on ways to improve preservative registration and quality control for treated wood.  
        关键词：Wood preservatives;Quality control;Chromated copper arsenate （CCA）   
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        发布时间：2021-02-08
      • FU Yue-jin~1,LU Bin~1,TANG Zhao-qun~2
        Issue 2, Pages: 46-47(2005) DOI: 10.19455/j.mcgy.2005.02.013
        摘要：An experiment was conducted to investigate the effect of the distance between clamp and cutting notch for plywood bond strength. The distance was continually changed from 0 to 40 mm in increments of 5 mm. Results showed that the bond strength values of plywood samples were closely related to the total distance with a linear tendency. When the distance increased from 0 to 15 mm, the bond strength increased along and hit the highest value of 1.71 MPa. When the distance kept increasing beyond 15 mm, the bond strength continued to decrease, and reached the lowest point of 1.11 MPa at the distance of 40 mm. Variance of analysis of the results also indicated a distinct relation between the distance and the bond strength of plywood.  
        关键词：plywood;Bond strength;Distance;Clamp;Cutting notch   
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        发布时间：2021-02-08
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