最新刊期
      期 0 ， 2020

        Review

      • QIAN Xiao-yu
        Vol. 23, Issue 4, Pages: 1-4(2009) DOI: 10.19455/j.mcgy.2009.04.001
        摘要：China is one of the largest forest products manufacturing,consuming and trading countries in the world.Due to the impact of the international financial crisis,the forest products market in China has decreased,forest products exports have declined,and industries are facing difficulties.In response to the financial crisis,the Chinese government has taken a series of powerful steps to reenergize the market and industries.It is expected China’s wood products industry will have a good future in the coming years and China’s status as the world’s major wood manufacturer will not change.  
        关键词：forestry industry;financial crisis;Wood processing;development trend   
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        发布时间：2021-02-08
      • AN Yuan1,YIN Ya-fang1,WANG Xi-ping2,R. J. Ross2,LU Jian-xiong1,JIANG Xiao-mei1
        Vol. 23, Issue 4, Pages: 5-8(2009) DOI: 10.19455/j.mcgy.2009.04.002
        摘要：A study was conducted to evaluate the bending performance of Douglas-fir structural lumber based on two different types of stress wave equipment.The dynamic performance,based on the stress wave tests,was compared to the result from the static bending test.The failure modes of structural lumber,and the impact that knots had on the static test,were analyzed.It was found that the correlation between the dynamic and static test results was high.Fibrous tension and brash tension were the two main failure modes.When knots appeared within the midspan range,and the ratio of knot diameter to knot depth of the cross section was high,the structural lumber was prone to brash tension failure.  
        关键词：structural lumber;stress wave;NDT;knots;failure modes   
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        发布时间：2021-02-08
      • CHEN Ren-wang1,LI Hui-ming1,ZHANG Zu-xiong1,ZHU Kun2
        Vol. 23, Issue 4, Pages: 47-49(2009) DOI: 10.19455/j.mcgy.2009.04.015
        摘要：Based on evaluation and analysis of Ammoniacal copper quaternary（ACQ）preservative,which was commonly used in wood product preservation industry in China,the authors found that the ACQ preservative exhibited some poor performance in mold inhibition,anti-metal corrosion,and chemical stability.A modified preservative,based on ammoniacal copper quaternary,was developed to improve its performance.The results showed that mold inhibition,anti-metal corrosion,and chemical stability of the modified ACQ preservative were improved considerably.  
        关键词：ACQ;wood preservation;modify;mold inhibition;metal corrosion;chemical stability   
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        发布时间：2021-02-08

        Research & Development

      • ZHOU Xia-xing1,LI Da-gang1,WU Zheng-yuan2
        Vol. 23, Issue 4, Pages: 9-11(2009) DOI: 10.19455/j.mcgy.2009.04.003
        摘要：Under 25% or 75% stress levels,wood-plastic floorings were evaluated for their creep and fatigue behavior after being subjected for two months to four different conditions（room temperature,sunshine,outdoor natural（dry and wet）,and soil isolated from oxygen）.It was found that the environmental conditions had considerable effect on the fatigue and creep behaviors of the specimens.Under the same stress level,conditioning at the outdoors natural location had the greatest effect on both fatigue and creep performance of the specimens while the room condition exhibited the least impact.Testing at the 25% stress level gave the following results:the average residual flexural strength of the specimens conditioned at room temperature was 94.2%～97.3% of the bending strength of the control specimens,93.1%～95.1% when conditioned in the soil,and 71.9%～84.5% when conditioned in the outdoors natural and sunshine locations.  
        关键词：wood-plastic flooring;Environment;modulus of rupture;creep;fatigue   
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        发布时间：2021-02-08
      • HAN Shu-guang,HUANG Run-zhou,WU Yu-fei,ZHANG Yang
        Vol. 23, Issue 4, Pages: 12-15(2009) DOI: 10.19455/j.mcgy.2009.04.004
        摘要：Melamine formaldehyde（MF）resin is a commonly-used resin to impregnate decorative paper which is laminated to the surfaces of wood-based panels.To improve the stability,shelf life,and flexibility of melamine formaldehyde（MF）resin,the authors selected diglycol and caprolactam to modify common melamine formaldehyde resin.The effect of four selected resin formula parameters（molar ratio of formaldehyde to melamine,water content,diglycol,and caprolactam content）on the properties of the modified MF resin was investigated.Properties including ambient and low temperature shelf lives,burst strength,surface bond strength and abrasion resistance were evaluated.The results showed that the modification with diglycol and caprolactam is an effective way to improve stability and flexibility of MF resin.Optimal ranges of parameters were also presented in this paper.  
        关键词：melamine formaldehyde resin;impregnation;surface decorated particleboard;storage stability;flexibility   
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        发布时间：2021-02-08
      • SUN Bai-ling,YANG Cai-xi,QIN Shao-shan,LIU Jun-liang
        Vol. 23, Issue 4, Pages: 16-18(2009) DOI: 10.19455/j.mcgy.2009.04.005
        摘要：Traditional inorganic putty made with calcium carbonate presents some shortcomings,such as poor water resistance and adhesion.The authors of this paper used latex（16% solids content）and wood flour（500 mesh）to make a wood flour putty to improve the water and adhesion performance.Two different latexes（epoxy resin and isocyanate resin）were used in this study and their effects on the performance of wood-flour putty were evaluated.Performance measurements included paint adhesion,water resistance,wear-resistance,and surface drying time.The results showed that both latexes could improve the performance of wood-flour putty.When the addition of the agents was increased,water resistance and wear resistance were considerably improved.Considering all the performance indexes,the wood-flour putty modified with either 8.0% epoxy resin or 2.0% isocyanate exhibited the best performance.  
        关键词：wood-flour putty;performance index;latex;wood-flour   
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        发布时间：2021-02-08

        Research Bulletin

      • ZHANG Hong-jian1,DONG Chun-lei1,Ying Hei Chui2
        Vol. 23, Issue 4, Pages: 19-21(2009) DOI: 10.19455/j.mcgy.2009.04.006
        摘要：Based on the classic static bending theory of a homogenous steel I-beam,the authors of this study investigated the load-displacement performance of non-homogeneous wood I-joists（IJ）made from different wood composites.The theoretical results and actual load-displacement data of wood I-joists were compared.The results indicated that:1)the classic static bending theory based on a steel I-beam could still be applied to wood I-Joists within the elastic stage;2)the tensile strain of the bottom flange and the compressive strain of the top flange were different and should be distinguished when designing wood I-joists.  
        关键词：wood I-joist;static bending performance;flange   
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        发布时间：2021-02-08

        Discussion & Suggestion

      • XUE Yong-jun,WANG Jun
        Vol. 23, Issue 4, Pages: 22-25(2009) DOI: 10.19455/j.mcgy.2009.04.007
        摘要：A technical model of life cycle assessment（LCA）was used in this study to investigate the environmental impact of producing panel furniture using medium density fiberboard（MDF）.The model included all aspects of furniture production from raw material supply,energy consumption,transportation,and waste management.The results showed that to produce one cubic meter of MDF panels,1.95 t of wood were required demanding a high impact on resources.The resulting environmental impact manifested primarily by the following values of standardized latent environmental impact:global warming of 313.35 PE,acidification of 43.34 PE,and solid residues of 953 mPE.The authors also presented suggestions for furniture manufacturers on how to utilize technology to minimize the environmental impact.  
        关键词：panel furniture;medium density fiberboard;life cycle assessment（LCA）;environmental impact   
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        发布时间：2021-02-08
      • HUA Jun
        Vol. 23, Issue 4, Pages: 26-29(2009) DOI: 10.19455/j.mcgy.2009.04.008
        摘要：The author analyzed the status,major accomplishments,and main problems in the wood products industry in recent years in northeast China.Based on the results,the technological demands and main tasks for the wood industry during the Twelfth Five-year Plan for northeast China were outlined.  
        关键词：northeast area;wood industry;science and technology needs   
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        发布时间：2021-02-08
      • GAO Feng1,ZHU Dian-xiang1,CHEN Zhi-guo2,LIU Yan1
        Vol. 23, Issue 4, Pages: 30-32(2009) DOI: 10.19455/j.mcgy.2009.04.009
        摘要：The purpose of this study was to investigate the causes of changes in acoustic emission（AE）signals corresponding to changes in grain orientation in routing.The angle between the cutting direction and the grain orientation has strong influence on the acoustic emission and the surface quality of wood.The results showed that the acoustic emission signal reached the strongest value when the angle was 0° and weakest when the angle was 90°.When the intensity of acoustic emission signal increased,the surface roughness was found to decrease.These results show acoustic emission could be used to monitor the quality of wood surfaces during various cutting conditions.  
        关键词：wood;acoustic emission（AE）;longitudinal-transverse cutting;surface roughness   
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        发布时间：2021-02-08
      • QIN Li,YU Wen-ji
        Vol. 23, Issue 4, Pages: 33-36(2009) DOI: 10.19455/j.mcgy.2009.04.010
        摘要：This paper describes the effects of the absorption of various wave lengths of sun-light and explains the mechanism of photo-induced aging of wood.The effects of light waves on the wood properties such as chemical components,molecular structure,and color and microscopic structural changes are also analyzed.This review provides a useful reference for future research on the anti-aging properties of wood and wood based panels for outdoor applications.  
        关键词：wood;photo-induced aging   
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        发布时间：2021-02-08
      • ZHU Yu-hong1,XU Zhao-yang2,LI Da-gang2,CHEN Wei-dan1,WU Zheng-yuan3
        Vol. 23, Issue 4, Pages: 37-39(2009) DOI: 10.19455/j.mcgy.2009.04.011
        摘要：Wood-plastic flooring is increasing its share in the flooring market due to its excellent performance in water resistance.Hatch,hollow,and solid structural profiles are the most commonly-used wood-plastic flooring profiles.Based on the specifications of their actual sizes,the moments of inertia for different flooring profiles were estimated using a model.Compared with the actual calculated results,it was found that the differences between the actual calculated and their corresponding estimated moments of inertia were negligible.  
        关键词：special-shaped;wood-plastic flooring;moment of inertia;cross-section   
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        发布时间：2021-02-08

        Piactical Techniques

      • TAN Hui-fen,GUO Hong-xia,DU Wan-li,WANG Qun
        Vol. 23, Issue 4, Pages: 40-42(2009) DOI: 10.19455/j.mcgy.2009.04.012
        摘要：Specimens of fast-grown,low density poplar wood were impregnated with organic and inorganic solutions which included urea-formaldehyde resin,polyacrylate emulsion,and silica sol.The authors analyzed the chemical composition changes,thermal performance,and compression strength of the treated wood specimens and compared them to untreated wood specimens.The results showed that the specimens impregnated with urea-formaldehyde resin had improvement in their thermal performance and compression strength.  
        关键词：urea-formaldehyde resin;polyacrylate emulsion;silica sol;wood modification;Poplar   
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        发布时间：2021-02-08
      • LIU Hai-ying,GU Ji-you,ZHANG Yan-hua,TAN Hai-yan,RUAN Guang-feng
        Vol. 23, Issue 4, Pages: 43-46(2009) DOI: 10.19455/j.mcgy.2009.04.014
        摘要：A copolymer latex of vinyl acetate（VAc）and vinyl ester of versatic acid（Veova10）was prepared by semi-continuous seeding emulsion polymerization.Some basic properties of the copolymer latex were found to be dependent upon the addition of Veova10.The results showed that:1)low-temperature brittleness of the latex film was improved;2)the shear strength of the copolymer latex decreased when the percentage of Veova10 was increased;3)storage stability and dilution stability the copolymer latex were good when the percentage of Veova10 was below 30% of the total weight of all monomers.  
        关键词：vinyl acetate;vinyl ester of versatic acid;latex;adhesive   
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        发布时间：2021-02-08
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