最新刊期
      期 0 ， 2020
      • ZHOU Yong-dong,YE Ke-lin
        Vol. 23, Issue 2, Pages: 1-3(2009) DOI: 10.19455/j.mcgy.2009.02.001
        摘要：A comparison of the traditional saw-dry-rip （SDR） method and the cant sawing technology of lumber production was made in this study to evaluate lumber grade recovery and efficiency. Chinese fir （Larix gmelini ） logs,originating from the northern-east area of China,were used. The advantages and disadvantages of the two different sawing methods were analyzed. It was found that lumber recovery from the cant sawing method was higher than that from the SDR sawing and that lumber quality from cant sawing was also better,as well. The cant sawing technique,with an optimized process that was developed for this study,was successfully transferred to the industry.  
        关键词：saw-dry-rip（SDR）;cant sawing;larch;dimensional lumber   
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        发布时间：2021-02-08
      • LI Hui-ming,CHEN Ren-wang,YAN Ting
        Vol. 23, Issue 2, Pages: 43-45(2009) DOI: 10.19455/j.mcgy.2009.02.015
        摘要：Heat treatment is a commonly-used method to improve the performance of lumber. In this paper,physical and mechanical properties of dimensional lumber of 4 selected Chinese species,treated under 180 ℃and 230 ℃,were evaluated. The results showed that the color of treated lumbers became darker with the increasing temperature. The dimensional stability,compression strength,and modulus of elasticity （MOE） showed considerable improvement. However,modulus of rupture （MOR） and impact resistance decreased when the treated temperature increased.  
        关键词：hardwood;softwood;heat-treated;physical and mechanical properties   
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        发布时间：2021-02-08

        Research & Development

      • HE Cui-fang,ZHOU Xiao-yan,ZHU Jing,WANG Si-min
        Vol. 23, Issue 2, Pages: 4-6(2009) DOI: 10.19455/j.mcgy.2009.02.003
        摘要：Cotton stalk fibers were obtained through the steam-explosion pulping process and binderless fiberboards were produced from the fibers without any chemical additives. The effect of steam-exploded pressure on fiber dimension,chemistry components,and board properties was investigated in this paper. The results showed that higher steam pressure produced finer fibers with higher sugar,acids,and higher alcohol contents. It was also observed that the internal bonding strength of the binderless fiberboard was improved under higher steam exploded pressure. However,the mechanical property of the board decreased as steam pressure was increased.  
        关键词：cotton stalk;steam-exploded;binderless fiberboard   
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        发布时间：2021-02-08
      • GAO Li,WANG Zheng,REN Yi-ping
        Vol. 23, Issue 2, Pages: 7-9(2009) DOI: 10.19455/j.mcgy.2009.02.004
        摘要：Bamboo strips were treated separately with two different fire retardant solutions （M1 and M2 solutions） through hot and cold open tank processes. Their flammability included oxygen index （OI）,heat release rate （HRR）,total smoke production （TSP）,and some selected mechanical properties,including modulus of rupture and modulus of elasticity,were evaluated. Compared with the control,untreated laminated bamboo lumber,the treated lumber exhibited superior fire retardant properties,especially for the lumber treated with the M2 solution. Although the mechanical properties of the treated lumber decreased,the overall structural performance still met the specifications of the standard LY/T 1072-2002.  
        关键词：flame retardant;laminated bamboo strip lumber;flammability;physical and mechanical properties   
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        发布时间：2021-02-08
      • LI Gang,QI Jing-kun,YIN Ling-yu,CHEN Lei,LIU Yi,LUO Hui,WANG Wei-hong
        Vol. 23, Issue 2, Pages: 10-12(2009) DOI: 10.19455/j.mcgy.2009.02.005
        摘要：Most woody-fiber based plastic composites have been made through the traditional extrusion process. However,difficulty handling some large sized bio-fiber and limited board width when using a small mould were among the barriers that prevent further development of wood-plastic composites. The authors,in this study,used the common hot-pressing technology to explore the potential of developing wheat straw/polyethylene composites. Polyethylene pellets were milled into a powder and mixed with the straw strands. The mixture was then preheated before hot pressing. It was found that the preheating not only reduced the hot pressing time,but also improved the bonding between the straw and polyethylene powder. The selected performance of the straw-polyethylene composite had a modulus of rupture of 14 MPa,modulus of elasticity of 1.1 GPa,internal bonding strength of 0.3 MPa,and thickness swelling of 4.05%.  
        关键词：hot press;preheat;powder;wheat straw;polyethylene   
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        发布时间：2021-02-08
      • WANG Ying1,GUO Kang-quan1,LI Jia-ning1,DUAN Xin-fang2,LI Yan-jie1
        Vol. 23, Issue 2, Pages: 13-15(2009) DOI: 10.19455/j.mcgy.2009.02.006
        摘要：The authors developed an environmentally friendly wood adhesive with good water resistance and low cost using natural konjac glucomannan （KGM） and chitosan as the main ingredients and modified them with sodium hydroxide. Detailed chemical processes with different percentages of each component were presented in the paper. The results showed the bonding strength of plywood samples made with the modified adhesive system using 1% Chitosan,1.5% KGM,and 1% sodium hydroxide produced plywood with the highest dry bonding strength,and the adhesive using 1% Chitosan,1.5% KGM,and 2% sodium hydroxide produced plywood with the best wet bonding strength.  
        关键词：konjac glucomannan;chitosan;plywood;bonding strength   
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        发布时间：2021-02-08
      • LIU Xin-you,ZHANG Bi-guang,YI Song-lin
        Vol. 23, Issue 2, Pages: 16-18(2009) DOI: 10.19455/j.mcgy.2009.02.007
        摘要：Theoretical prediction usually provides basic understanding and guidance to establish reasonable technology in the production process. A partial differential equation was used in this study to predict heat transfer time between the surface and core layer of wood during heat treatment. The prediction was compared with the result of an experiment that was performed on Chinese poplar lumber with various thicknesses of 20 mm,40 mm and 60 mm. The times for the core temperature to reach to 100 ℃,130 ℃,and 180 ℃ were recorded and compared with the predicted values. The comparison of the results showed that the theoretical predicted times matched the experimental values very well.  
        关键词：heat treatment;Poplar;heat transfer time;theoretical prediction;experimental verification   
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        发布时间：2021-02-08

        Review

      • GUO Wei1,FEI Ben-hua1,CHEN En-ling1,REN Hai-qing2,ZHOU Hai-bin2
        Vol. 23, Issue 2, Pages: 19-22(2009) DOI: 10.19455/j.mcgy.2009.02.008
        摘要：This paper reviewed the history of wood structural construction in China,its development and progresses made in the past ten years. It also analyzed the characteristics,distribution,and size of the wood structural construction industry. The domestic research needs on wood structural construction technology and standard for wood were summarized.  
        关键词：wood structural construction;light frame housing;dimension lumber   
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        发布时间：2021-02-08

        Discussion & Suggestion

      • WU Zhi-hui1,XU Wei1,NIU Guang-xia2
        Vol. 23, Issue 2, Pages: 23-26(2009) DOI: 10.19455/j.mcgy.2009.02.009
        摘要：This paper reviewed the current status and characteristics of the furniture and interior decoration industry in China. It also provided a detailed analysis of the science and technology,raw material supply,and critical obstacles in these industries. Finally,this study recognized that innovative research and technology were the keys to promoting furniture and interior decoration products in China over the next five years.  
        关键词：furniture;interior decoration;Twelfth Five-Year Plan   
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        发布时间：2021-02-08
      • LI Nian-cun1,CHEN Dong-hua2
        Vol. 23, Issue 2, Pages: 27-30(2009) DOI: 10.19455/j.mcgy.2009.02.010
        摘要：The wood products industry in south central China plays an import role in the development of the local economy. For the last decade,a competitive wood industry,including wood-based composites,furniture,and raw material supply,has been formed in this region. Many leading enterprises and industry clusters with diverse products have emerged. However,insufficient forest resources in the region,low quality industry standards,and lack of innovative technology are identified as major barriers for continued development. The authors recommend that the future emphasis to improve the industrial competitiveness should focus on the areas of improving product efficiency,recycling and reusing waste wood material,developing non-wood fiberous board and green products,improving the performance of plantation wood,and improving innovative capability.  
        关键词：south central China;wood industry;medium density fiberboard   
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        发布时间：2021-02-08
      • ZHANG Jian1,CHEN Zhi-lin2,ZHOU Jian-bin1,FU Feng2
        Vol. 23, Issue 2, Pages: 31-33(2009) DOI: 10.19455/j.mcgy.2009.02.011
        摘要：Biomorphic SiC ceramics,a new environmentally friendly type of composite,have been drawing a considerable amount of attention by researchers in recent years. Because of their excellent properties,such as high mechanical strength,high thermal stability,resistance toward oxidation and corrosion,and chemical inertness at high temperatures,SiC ceramic composites have shown great potential in the building construction market. This paper summarized the fabricating methods and mechanisms of the biomorphic SiC ceramics produced from abundant biobased materials such as wood,bamboo,and rice straw. Based on the review of the current research status and obstacles facing these new composites,the authors discussed the future research direction in this area.  
        关键词：biomorphic SiC ceramic;process;research status;developing trends   
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        发布时间：2021-02-08
      • ZHANG Wei-gang1,BAO Bin-fu1,LIU Jun-liang2,FU Feng2
        Vol. 23, Issue 2, Pages: 34-36(2009) DOI: 10.19455/j.mcgy.2009.02.012
        摘要：Wood densification is an important way to improve properties of plantation grown Chinese Fir. This paper reviewed the current research of wood compression techniques,developed in China,for Chinese fir. It also analyzed some existing problems in compression recovery,chemical impregnation,and durability improvement. Finally,it provides suggestions and recommendations for future research and development in this area.  
        关键词：wood;Chinese Fir;densification;impregnation   
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        发布时间：2021-02-08

        Piactical Techniques

      • LI Hua1,LIU Xiu-ying1,CHEN Yun-shi1,ZHANG Xiao-fang2,YU Zi-xuan2
        Vol. 23, Issue 2, Pages: 37-39(2009) DOI: 10.19455/j.mcgy.2009.02.013
        摘要：Traditional inspection of ancient wood buildings in China was mainly based on visual examination and personal experience with limited instruments. The authors introduced a recently developed resistograph system and 3D impulse tomography as non-destructive testing methods for ancient wood members. A laboratory experiment and a field inspection on an ancient wood structure indicated that the 3D impulse system was very effective for inspecting ancient wood structures. Combined with the resistograph system and visual inspection,the 3D tomography provides reliable inspection results.  
        关键词：ancient wood building;non-destructive testing;3D impulse system;resistography   
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        发布时间：2021-02-08
      • LIU Zhi-jia1,LI Li2,BAO Fu-cheng1,WANG Rui-juan3
        Vol. 23, Issue 2, Pages: 40-42(2009) DOI: 10.19455/j.mcgy.2009.02.014
        摘要：Bleaching is an effective way to remove the color difference of wood after its hydrothermal treatment.Different bleach formulas were investigated on their effectiveness of minimizing the color variation of commonly-used maple and rubber lumbers. The results showed that rubber wood was easier to bleach than maple wood. The optimum bleaching conditions were found to depend on the hydrothermal treatment conditions.  
        关键词：wood bleach;hydrothermal treatment;solid wood;maple;rubber;peroxide   
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        发布时间：2021-02-08
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