最新刊期
      期 6 ， 2017
      • ZHONG Yong,JIANG Ze-hui,REN Hai-qing,WU Guo-fang,ZHAO Rong jun
        Vol. 31, Issue 6, Pages: 5-9(2017) DOI: 10.19455/j.mcgy.20170601
        摘要：The authors sought to establish a method to determine characteristic strength of structural wood materials by using the nonparametric method, to provide a scientific basis for safety design and reasonable application in wood building structures. Characteristic strength was a key mechanical property index for structural wood materials, which was determined by confidence level requirements. Random samples generated by a normal distribution were used to investigate relationships among confidence level and coefficient of variation of sample’s strength, specimen numbers in sampling, as well as statistical order for characteristic strength. Minimum number of specimens at different confidence levels and statistical order were obtained. A calculation formula for the statistical order was then developed.  
        关键词：structural wood materials;characteristic strength;nonparametric method;confidence level;normal distribution   
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        发布时间：2021-02-08
      • SHENG Zhen-xiang,YUE Qun-fei,QU Guo-fu,ZHANG Hong-jian,REN Ding
        Vol. 31, Issue 6, Pages: 30-34(2017) DOI: 10.19455/j.mcgy.20170606
        摘要：The development, technical progress and applications for continuous presses for wood-based panel production were reviewed and summarized. New application potentials such as plywood production,3-layer wood-plastic composite production and polymethyl methacrylate（PMMA） production for continuous presses were presented.  
        关键词：continuous press;isochoric press;isobaric press;plywood;wood-plastic composites;PMMA   
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        发布时间：2021-02-08
      • WEI Jin-guang,WEI Ya-nan,ZHANG Ya-hui,LI Chang-gui,YU Wen-ji
        Vol. 31, Issue 6, Pages: 43-45(2017) DOI: 10.19455/j.mcgy.20170609
        摘要：Scrimber samples with different density were made of heartwood and sapwood of Radiata pine（Pinus radiata） separately and performances of the scrimber were tested. The results showed that water resistance and mechanical properties of the scrimber were improved with increased density whereas heartwood and sapwood had little influence on properties. The tests showed that the properties of the scrimber samples could meet the requirements of the Chinese Standard GB/T 20241-2006.  
        关键词：Pinus radiata;scrimber;heartwood and sapwood;density;properties   
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      • Vol. 31, Issue 6, Pages: 55(2017)
        摘要：<正>为了加快科技成果转化,提升企业创新能力,中国林科院木材工业研究所联手我国木结构装备制造领域的先导企业——烟台博海木工机械有限公司,共同创建了我国第一家木结构装备研发中心,于2017年9月正式在烟台博海公司挂牌。中国林科院木材工业研究所领导和专家,烟台开发区管委会及科技局、财政局的领导,国内木结构生产企业及博海公司的合作伙伴代表出席揭牌仪式。  
          
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        发布时间：2021-02-08
      • Vol. 31, Issue 6, Pages: 56(2017)
        摘要：<正>2017中国木结构产业发展高峰论坛9月在山东临沂盛大举行,来自国内木结构产业链上中下游的企业、科研、高校、协会及当地政府代表200余人参会。会议由中国林科院木材工业研究所和全国木材标准化委员会结构材分会联合主办,针对国家目前积极倡导的建筑工业化、装配化,旨在加强产学研的合作、技术交流与协同攻关,完善相关标准的修  
          
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        发布时间：2021-02-08

        Research & Development

      • LV Shao-yi,CHEN Yan-ping,HAN Shen jie,GUO Li-min,WANG Si-qun,CHEN Zhi-lin
        Vol. 31, Issue 6, Pages: 10-14(2017) DOI: 10.19455/j.mcgy.20170602
        摘要：In order to develop functional aerogel materials, wood pulp fiber（WPF）/cellulose nanocrystals（CNC） crosslinked aerogels were prepared by using 1, 2, 3, 4-butanetetracarboxylic acid（BTCA） as the crosslinking material. The authors then investigated the degree of cross-linking due to morphology,specific surface area, pore structure, crystallization and chemical structure of the aerogels. The results showed that the aerogels had a three-dimensional network structure formed by intertwined WPF and CNC,and the WPF was surrounded by nanofibers formed by the CNC. BTCA crosslinking had a significant effect on the structure and properties of the aerogels. As the crosslinking material increased, crystallinity,specific surface area and pore volume of the aerogels decreased.  
        关键词：aerogels;cellulose nanocrystal;wood pulp fiber;crosslinker;preparation;structure   
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        发布时间：2021-02-08
      • LU Li,PAN Ya-ge,ZHU Ling-bo,TANG Qian,WU Yi-qiang,LI Xin-gong
        Vol. 31, Issue 6, Pages: 15-19(2017) DOI: 10.19455/j.mcgy.20170603
        摘要：With wheat straw and wood chips as raw materials, three-layer particleboard was made with Mg-based inorganic adhesive. Effects of wheat straw/wood ratio, board density, hot-pressing time and temperature on physical and mechanical properties of the board samples were studied. Results showed that modulus of rupture（MOR）, modulus of elasticity（MOE） and thickness swelling（TS） gradually decreased and internal bond strength（IB） gradually increased with increasing the wheat straw in the wheat straw/wood ratio. As board density increased and hot-pressing time extended, MOR, MOE and IB gradually increased while TS decreased. As hot-pressing temperature raised, MOR, MOE and IB first gradually increased and then decreased, TS was in contrast. The optimal preparation parameters were:wheat straw-wood mass ratio of 5 : 5, board density of 1.2 g/cm3, hot-pressing time of 30 min and hot-pressing temperature of 100 ℃.  
        关键词：wheat straw;wood;three-layer particleboard;inorganic adhesives;optimal parameter   
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        发布时间：2021-02-08
      • CHEN Qiu-yun,TENG Qi-cheng,GAO Yi-fan,QUE Ze-li
        Vol. 31, Issue 6, Pages: 20-25(2017) DOI: 10.19455/j.mcgy.20170604
        摘要：Parallel-chord wood trusses are widely used in floor plane systems of light timber frame structures. In practice, components of parallel-chord wood trusses could be arranged in two ways. One is lumber-on-edge truss and another is lumber-on-flat truss. In this study, deflection of top and bottom nodes of these two kinds of parallel-chord wood trusses were measured through static load tests, bearing capacity,rigidity and failure modes of the nodes were analyzed. The results showed that lumber-on-edge trusses provided a better ultimate bearing capacity and higher rigidity with components’ failure as the main failure mode. When it turned to lumber-on-flat trusses, nodes failure was the main failure mode. Chord extension in wood trusses has significant influence on its bearing capacity. Therefore, butt joints shall be strengthened since the safety performance requirement is normally high.  
        关键词：dimension lumber;parallel-chord wood truss;components arrangement;static loading test   
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        发布时间：2021-02-08
      • ZHAO Pei-yan,ZHANG Xin-pei,SHI Bai-nan,WANG Chuang
        Vol. 31, Issue 6, Pages: 26-29(2017) DOI: 10.19455/j.mcgy.20170605
        摘要：According to reliability theory, probability distribution must be first understood to determine shear strength design values of metal-plate-connected joints. The authors conducted a shear strength test on five connecting angles of specimens composed of widely used domestic metal-plates and second grade SPF dimensional lumber from North America. The testing data were analyzed by distribution fitting methods combined with sum of squared residual analysis. The test results showed normal logarithmic shear strength distribution for the metal-plate-connected joints. Finally, using ratios of mean values and standard values, "K" were determined for reference for further analysis of reliability and determination of design values.  
        关键词：metal-plate connection;shear strength;distribution fitting test   
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        发布时间：2021-02-08

        Discussion & Suggestion

      • WANG Rui,DUAN Xin-fang,ZHANG Ran
        Vol. 31, Issue 6, Pages: 35-38(2017) DOI: 10.19455/j.mcgy.20170607
        摘要：Aims to establish a industrial chain system framework for fully customized housing decoration in China, the authors analyzed the status of the industry. They proposed that the system should be composed of seven sub-systems including basics and comprehension, design, manufacturing, logistics,installation, acceptance check and maintenance. They also gave suggestions on drafting more new standards in urgent needs to improve the system.  
        关键词：fully customized housing decoration;industrial chain;standard system   
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        发布时间：2021-02-08
      • WU Zhen-hua,LIU Yuan-qiang,ZHANG Xiao-wei,YE Jiao-you,SHEN Jian-ping
        Vol. 31, Issue 6, Pages: 39-42(2017) DOI: 10.19455/j.mcgy.20170608
        摘要：Impregnated paper-overlaid boards were made with E0 grade blockboards as substrates, poplar veneers as buffer layers and A-grade impregnated papers as decorative surfaces. Formaldehyde emissions from the impregnated papers and the decorated board overlaid with the paper were tested, respectively. The results showed formaldehyde emissions from the impregnated paper-overlaid boards could be less than 0.5 mg/L only if the formaldehyde emissions from the papers were less than 0.7 mg/L.  
        关键词：impregnated paper;impregnated paper-overlaid blockboard;formaldehyde emissions   
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        发布时间：2021-02-08

        Piactical Techniques

      • SHI Xiao-hong,LU Xu-chen,PANG Xiao-ren,SHENG Na
        Vol. 31, Issue 6, Pages: 46-49(2017) DOI: 10.19455/j.mcgy.20170610
        摘要：In order to better make reconstituted decorative veneers, a traditionally used urea-formaldehyde resin（UF） was mixed with modified corn-starch emulsions and then reinforced with a polyvinyl acetate emulsion（PVAc）, an aqueous solution of polyvinyl alcohol（PVA）, an anionic polyacrylamide（APAM） as well as polymethylene polyphenyl isocyanate（PAPI）. The results showed that the newly made veneers with the modified adhesive had better flexibility than the controls with less formaldehyde emission.  
        关键词：reconstituted decorative veneer;sliced veneer;modified corn-starch emulsion;urea formaldehyde resin;polyvinyl acetate emulsion;modifying agent   
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        发布时间：2021-02-08
      • WEI Yan-qiang,JIANG Shuai-cheng,LI Yun-yan,CHENG Xi-yi,XIE Jie,LI Xian-jun
        Vol. 31, Issue 6, Pages: 50-53(2017) DOI: 10.19455/j.mcgy.20170611
        摘要：Superheated steam was used to dry masson pine（Pinus massoniana） lumber. Effects of drying temperature on color, moisture deviation in thickness direction and deresination were studied. The results showed that there was little effect on wood color and moisture deviation in thickness direction was less than 1% in superheated steam drying. The pine rosins were either driven to wood surfaces or consolidated inside. It was feasible to use superheated steam technology for both wood drying and deresination.  
        关键词：Pinus massoniana;Superheated Steam;color;deresination;microstructure   
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