最新刊期
      期 0 ， 2020

        Review

      • LONG Chao,LU Jian-xiong
        Issue 5, Pages: 1-4(2007) DOI: 10.19455/j.mcgy.2007.05.001
        摘要：Dimensional lumber is an important building material in modern lightweight timber frame structure.As a newly introduced building material,research on its properties remain at a preliminary stage in China.The authors first describe the concept of dimensional lumber and the progress of in-grade testing for dimensional lumber in North America.They then analyze the effects of different testing conditions for mechanical properties and predict the trend of testing methods for mechanical properties of dimensional lumber.Finally,the authors make some suggestions for further research for testing methods.  
        关键词：dimensional lumber;mechanical property;in-grade test;progress   
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        发布时间：2021-02-08

        Research & Development

      • GU Ji-you1,WEI Shuang-ying1,MENG Li-peng1,ZHANG Zhan-wen2
        Issue 5, Pages: 5-7(2007) DOI: 10.19455/j.mcgy.2007.05.002
        摘要：Veneer,dyed by acid dyes,easily fades because of its poor color fastness to water.In order to improve the color fastness to water,the veneers（Betula spp.）were treated with different color fastening agents after dyeing,and the influences of the different agents to the dyed veneer were investigated in this paper.The results proved that the veneer dyed with the color fastening agent of KAl（SO4）2,compared with other five mineral salts such as Na2SO4,CuSO4,etc.,had advantages of small color variation and excellent color fastness.The veneer treated by fastening agent Y could also gain a good effectiveness but was not environmentally-friendly.The effectiveness of veneer coated by chitosan after dyeing was the best among those treated with KAl（SO4）2 and fastening agent Y,respectively,that not only had small color variation but considerably improved the stability of dyeing.  
        关键词：veneer dyeing;color fastness to water;chitosan;treat after dyeing   
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        发布时间：2021-02-08
      • WANG Ya-mei1,LIU Jun-liang2,JIANG Ming-liang2,QIN Dao-chun3
        Issue 5, Pages: 8-10(2007) DOI: 10.19455/j.mcgy.2007.05.003
        摘要：A laboratory decay experiment was conducted on bamboo（Phyllostachys pubecens）with 13 kinds of preservatives that were used and compared.The results showed that,1)The effects of different preservatives improved when the retention level was increased.2)The decay resistance of ACQ-B was the best among all the five ACQ preservatives,and was followed by ACQ-D.At a low retention,the resistance of ACQ-C to white rot was the worst,and the weight loss rate reached about 6%.3)Among the four CuAz formulations,CuAz-1 showed the best resistance to white rot,while CuAz-2 was the worst.But,there was little difference for the resistance to brown rot.4)The decay resistance of ACQ and CuAz were close to CCA,and obviously superior than organic acid preservative.  
        关键词：bamboo;Preservative;laboratory decay resistance   
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        发布时间：2021-02-08
      • ZHANG Li-ping,XU Bo-han,CHEN Xi
        Issue 5, Pages: 11-12(2007) DOI: 10.19455/j.mcgy.2007.05.004
        摘要：A new activated carbon was manufactured with sawdust from plantation grown tripoloid populus tomentosa by dipping in phosphoric acid and baking under high temperature.Moreover,the adsorption capability of the carbon was also tested.From the results,the proper conditions of making the activated carbon were ascertained as follows:H3PO4 concentration of 55%,ratio of solid to liquid was 1∶2,baking under 400 ℃ for 4 h,and sawdust diameter of 4060 mu.The activated carbon exhibited the most efficient adsorption capacity for alkalinity fuchsine for 4 h at pH 7 and 30 ℃.The carbon could regenerate six times without degrading the adsorption capability.Its adsorption capability was comparable to the commercial activated carbons.  
        关键词：Tripoloid populus tomentosa;phosphoric acid;activated carbon;Adsorption   
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        发布时间：2021-02-08

        Research Bulletin

      • PENG Wan-xi1,FAN Zhi-cai2,LI Kai-fu3,WU Shu-bin4,WU Yi-qiang1
        Issue 5, Pages: 13-15(2007) DOI: 10.19455/j.mcgy.2007.05.005
        摘要：An orthogonal experiment was conducted to investigate the bleaching technology for water-extracted veneer of Eucalyptus urophylla×grandis.Taking the whiteness and color difference of the bleached veneer as indexes,the factors that could affect the bleaching results were evaluated,including bleaching temperature,time,and the concentration of Na2SiO3 and H2O2.Results found that the pH value of the bleaching solution only influenced the bleaching rate,and had almost no effect on the bleaching quality.The optimum parameters were determined as:5% concentration of H2O2,1.2% Na2SiO3,bleaching solution pH of 910,and a temperature of 70 ℃ for a duration of 90120 minutes.  
        关键词：Eucalyptus urophylla×grandis;veneer;Bleaching;hydrogen peroxide   
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        发布时间：2021-02-08
      • LI Ben-gui,PENG Wan-xi,QIAO Jian-zhen,ZHANG Zhong-feng,WU Yi-qiang
        Issue 5, Pages: 16-17(2007) DOI: 10.19455/j.mcgy.2007.05.006
        摘要：Alternate adsorption-desorption treatments were carried out on Eucalyptus urophylla ×grandis wood through cyclic humidity exposure and recording the real-time tangential shrinkage and bulking properties.The results showed that the initial moisture content had a notable effect on the tangential shrinkage of Eucalyptus urophylla×grandis,while the times of alternate adsorption-desorption treatments only affected the tangential bulking property.The cyclic humidity treatments also shortened the shrinkage and bulking vibration periods,and thus was helpful in alleviating deformation and keeping dimensional stabilization.  
        关键词：Eucalyptus urophylla×grandis;alternate adsorption-desorption treatments;tangential shrinkage and bulking properties   
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        发布时间：2021-02-08

        Discussion & Suggestion

      • WANG Dan,ZHANG Hong-jian
        Issue 5, Pages: 18-20(2007) DOI: 10.19455/j.mcgy.2007.05.007
        摘要：Wood-based reconstructed materials for wood frame housing were summarized and evaluated for their characteristics and main purposes in this article.Related standards in Canada,America,Japan and Germany were also listed for reference.  
        关键词：reconstructed;structural materials;wood frame housing   
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        发布时间：2021-02-08
      • HUANG Rong-feng,LU Jian-xiong,ZHAO You-ke
        Issue 5, Pages: 21-24(2007) DOI: 10.19455/j.mcgy.2007.05.008
        摘要：Many industrial fields in Japan have applied high frequency and microwave heating techniques that were introduced from Europe.Some research and development and application examples of these techniques in the Japanese wood industry are presented in this paper including wood gluing,drying,plasticizing treatment,heat treatment etc.The present status and expectations for application in China’s wood industry are also discussed.  
        关键词：high frequency;Microwave;lumber;heating treatment   
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        发布时间：2021-02-08
      • YU Li-li,CAO Jin-zhen
        Issue 5, Pages: 25-28(2007) DOI: 10.19455/j.mcgy.2007.05.009
        摘要：Arsenic and chromium based water-borne preservatives,especially CCA（chromated copper arsenate）,have been partly replaced by some copper based preservatives.To improve the poor leaching resistance of water-borne preservatives,this paper presented four approaches to accelerate the fixation of active ingredients in treated wood.It also analyzed the fixation effects of these approaches on the active ingredients of CCA and other preservatives in treated wood,and predicted the future research on how to accelerate the active ingredients of ACQ preservative in treated wood.  
        关键词：water-borne preservatives;Wood preservation;leaching;fixation   
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        发布时间：2021-02-08
      • YAO Li-hong1,WANG Xi-ming1,FEI Ben-hua2,ZHAO Rong-jun2
        Issue 5, Pages: 29-31(2007) DOI: 10.19455/j.mcgy.2007.05.010
        摘要：With greater economic development and the improvement of people’s standard of living,modern wooden structures have become a new hot spot in current construction.Therefore,fireproof performance of wooden buildings is becoming more and more important.The authors first introduce the development status of wooden buildings in China.They then describe the advantages of fireproofing wooden buildings as compared to steel construction and reinforced concrete construction.In conclusion,they make some suggestions for further research and development trends on fireproofing of wooden buildings.  
        关键词：wooden structure buildings;fireproofing;present status   
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        发布时间：2021-02-08
      • QIN Te-fu,HUANG Luo-hua,LI Gai-yun,CHEN Shi-ying
        Issue 5, Pages: 32-34(2007) DOI: 10.19455/j.mcgy.2007.05.011
        摘要：This paper reviewed the studies and standards for structural laminated wood adhesives and the testing methods in China.  
        关键词：structural laminated wood;adhesives;standard;aging properties;evaluation   
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        发布时间：2021-02-08

        Piactical Techniques

      • HAN Wei-sheng1,WU Zhi-hui2
        Issue 5, Pages: 35-37(2007) DOI: 10.19455/j.mcgy.2007.05.012
        摘要：To find ways of improving boring process efficiency in panel furniture production,the authors of this article made an investigation of the operation time of a fully automatic,six-row boring machine.By studying some boring machining families,standard time datum for unit operation was set up.Some methods of shortening operation changing time were also presented.  
        关键词：panel furniture;six-row boring machine;time study;machining family;operation changing   
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        发布时间：2021-02-08
      • LIN Bao-quan,ZHENG Chong-su
        Issue 5, Pages: 38-40(2007) DOI: 10.19455/j.mcgy.2007.05.013
        摘要：A control system for glue application in particleboard production designed by the authors of this article,with PLC（Programmable logic controller）is presented.This system consists of a set of PLC,converters,glue-applying motors,man-machine interface and so on.By PID（Proportional-integral-differential）algorithm,the system could precisely control the ratio of particle and adhesive.It also has an alarm system,and parameter displaying and accumulative amount displaying functions,which assure the quality of the particleboards.  
        关键词：glue application;PLC;particleboard   
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        发布时间：2021-02-08

        Practical Techniques

      • WU Wei-jian1,GU Ji-you2
        Issue 5, Pages: 41-43(2007) DOI: 10.19455/j.mcgy.2007.05.014
        摘要：To improve the water resistance of polyvinyl acetate adhesive（PVAc）,a hydrophobic monomer,reactant organic silicone,and cross-linking agents were introduced during its preparation.A further orthogonal experiment was conducted to determine the optimum ratios of the copolymerizable monomers.Other tests on the properties of the modified adhesive verified that introducing monomers to copolymerize with vinyl acetate was an effective way to prepare a PVAc with high water resistance.  
        关键词：polyvinyl acetate adhesive（PVAc）;modification;water resistance   
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        发布时间：2021-02-08
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