最新刊期
      期 3 ， 2020

        Research & Development

      • XIONG Ling-ming,XU En-guang,LIN Lan-ying,ZHOU Yong-dong,FU Feng
        Vol. 34, Issue 3, Pages: 1-5(2020) DOI: 10.19455/j.mcgy.20200301
        摘要：High-intensity microwave equipment is widely used for wood treatment before drying and modification. Using CST and Creo2.0 software, electromagnetic field simulation was analyzed, and a three-dimensional（3D） model was developed. The results provided a basis for prototype manufacturing.  
        关键词：microwave equipment;wood;per-treatment;3D design;simulation analysis   
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        Discussion & Suggestion

      • CHEN Jia-bao,WANG Li-jun,NAN Jing-ya,WANG Chun-peng,CHU Fu-xiang
        Vol. 34, Issue 3, Pages: 6-9(2020) DOI: 10.19455/j.mcgy.20200302
        摘要：Medium density fiberboard（MDF） samples were manufactured with two-component soybean flour-based adhesives, which were modified with tannin-based cross-linking agent. Effects of manufacturing parameters and board density on physical and mechanical properties of the MDF samples were studied. The results showed that mechanical properties of the MDF samples improved gradually with increasing of hot pressing time, hot pressing temperature, and mat moisture content（MC） and board density, while on the other hand, 24 h thickness swelling（TS） of the MDF samples showed a gradually decline. Under 330 s of hot pressing time, 190～200 ℃ of hot pressing temperature, 7%～9% of MC and 750～840 kg/m3 of board density, the properties of the MDF samples could meet the requirement of China national standard GB/T 11718—2009.  
        关键词：tannin;modification;soybean flour-based adhesive;medium density fiberboard;manufacturing technology   
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        发布时间：2021-01-27
      • ZHOU Yang-fan,CHEN Yi-bin,ZHANG Tao,SU Hao-mian,DENG Ran,SUN Li-chao
        Vol. 34, Issue 3, Pages: 10-13(2020) DOI: 10.19455/j.mcgy.20200303
        摘要：Influences of the hot pressing variables such as temperature, time and pressure were investigated on performance of veneered PVC-based wood/plastic composites（WPC）. Silane coupling agent of KH-550 was applied in order to improve interface bonding behavior between the veneer and the WPC substrate. The results showed that composite samples had the best performance under the following manufacturing conditions as applying 1.4% of KH-550 silane coupling agent, 130 ℃ of hot-pressing temperature, 1.5 MPa of hot pressing pressure and 200 s of pressing time. A firm and tight interface between the veneer and the WPC substrates through SEM images was further observed.  
        关键词：veneer;WPC;overlaying;coupling agent;interface bonding;technical parameters;performance   
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      • ZHANG Jing-peng,WANG Zhao-hui,MA Xing-xia,QU Wei,JIANG Ming-liang
        Vol. 34, Issue 3, Pages: 14-17(2020) DOI: 10.19455/j.mcgy.20200304
        摘要：Copper triazole was chosen to treat the sheathing plywood using vacuum processes at various pressures and treatment duarations. The durability and mechanical properties of the treated samples were examined. The results revealed that parameters of the optimized treatment were: vacuum in-0.04 MPa for 10 minutes, then soaking at the atmospheric pressure for 10 minutes. The testing result showed that the preservative-treated plywood presented a high level of durability with less than 5% of mass losses; and the modulus of rupture and modulus of elasticity of the samples met the requirements on sheathing plywood for wood-frame structures of the Chinese national standard GB/T 22349—2008.  
        关键词：sheathing plywood;wood-frame structures;copper triazole;treatment procedure;durability;mechanical properties   
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      • XIA Yong-hui,ZHENG Xiao-yan,WEI Jian
        Vol. 34, Issue 3, Pages: 18-22(2020) DOI: 10.19455/j.mcgy.20200305
        摘要：A steel-wood composite panel composed of cold-formed thin-walled steel plate and plywood connected with structural glue and screws was developed. The influences of the steel plate thickness, plywood thickness, composite panel height and span on the natural vibration and bending performance of the composite panel were analyzed. And a more effective and simpler comfort criterion was proposed. The results showed that the plywood and the thin-walled steel plate could be well combined together. Increasing the thickness of the steel plate and the thickness of the plywood could significantly improve the bearing capacity and vibration comfort of the composite panel. The panel was recommended to for residential or office buildings with floor spans no greater than 3.6 m.  
          
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      • TANG Qi-heng,REN Yi-ping,GUO Wen-jing,WANG Ge,CHENG Hai-tao
        Vol. 34, Issue 3, Pages: 23-26(2020) DOI: 10.19455/j.mcgy.20200306
        摘要：In this laboratory study, melamine pyrophosphate（MPP） as the flame retardant was added at various mass ratios to the bamboo fiber（BF）/polypropylene（PP） composites. Combustion performance of the composite samples were measured using cone calorimeter. The results showed that adding MPP contributed to formation of a dense carbon layer on the surface of the composite samples during combustion process. The charring yield and the time to ignition（tign） were increased, while the total heat release rate, the total smoke release rate and the combustion speed were all reduced significantly and the production of CO2 were decreased considerably. The smoke suppression property of the composite samples with MPP as the flame retardant was improved effectively.  
        关键词：bamboo fiber（BF）;polypropylene（PP）;melamine pyrophosphate（MPP）;composites;cone calorimeter;combustion performance   
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        发布时间：2021-01-27
      • ZHU Jing-yang,DONG Xian-ming,WANG Ning,YUAN Na-xin,SUN Hong-yu
        Vol. 34, Issue 3, Pages: 27-31(2020) DOI: 10.19455/j.mcgy.20200307
        摘要：Cassava straw/polypropylene carbonate（PPC） composites samples were made at laboratory. Orthogonal array testing method with two factors and four levels was used to investigate effects of the calcium carbonates as a filler. Mechanical properties and thermal stability of the composites were evaluated. The results showed that mechanical properties of the composite samples filled with both nano-calcium carbonate and active calcium carbonate were better than that filled with heavy or light calcium carbonate. Particularly, bending strength of the composite samples filled with 15% nano-calcium carbonate presented 42.1 MPa, which exceeded the requirements（≥20 MPa） of China national standard GB/T24137—2009. Thermal gravimetric analysis（TGA） results further showed that thermal stability of the composite samples was improved to some extent by filling with calcium carbonates.  
        关键词：calcium carbonate;cassava straw;polypropylene carbonate（PPC）;mechanical properties;thermal stability;rheological property   
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        发布时间：2021-01-27
      • ZHANG Zhong-tao,LI Hao,WANG Yu,JIA Wei-hua
        Vol. 34, Issue 3, Pages: 32-36(2020) DOI: 10.19455/j.mcgy.20200308
        摘要：The new industry specification of HJ 1032—2019"Technical Specification for Application and Issuance of Pollutant Permit—Wood-based Panel Industry" was issued recently by the Ministry of Ecology and Environment. The authors introduced the compiling background, analyzed the permission scope and management categories. They also explained in detail the key points of the specification and provided suggestions for reference of the local ecology and environment authorities and the wood-based panel industry in China.  
        关键词：wood-based panel（WBP） industry;pollutants discharge permit;specification;interpretation   
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      • GUO Fei-yan,GAN Mei-jiao,XU Man-ping,CHEN Yu-he,LI Jing-peng
        Vol. 34, Issue 3, Pages: 37-39(2020) DOI: 10.19455/j.mcgy.20200309
        摘要：1 m3 chamber method and 9～11 L desiccator method were used to detect formaldehyde emissions from laminate flooring and engineered wood flooring product samples. Test results were analyzed and the comparison between the two methods was established. It was found that the formaldehyde emissions from the laminate flooring and engineered wood flooring samples had a significant linear relationship with these two methods. But the linear regression equations should be adjusted whenever the product batch,product structure and technical parameters changed.  
        关键词：1 m3 chamber method;9～11 L desiccator method;formaldehyde emission;comparison;flooring   
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      • HE Tuo,GAO Rui-qing,JIAO Li-chao,LIU Bo,JIANG Xiao-mei
        Vol. 34, Issue 3, Pages: 40-43(2020) DOI: 10.19455/j.mcgy.20200310
        摘要：Present status of leading xylaria in both of overseas countries and China were reviewed. Future development trends and prospects were also analyzed. Suggestions were provided for further development of xylaria in China.  
        关键词：xylaria;current status;suggestions;digitalization;sharing network   
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      • CHEN Hao,ZHONG Shi-lu
        Vol. 34, Issue 3, Pages: 44-47(2020) DOI: 10.19455/j.mcgy.20200311
        摘要：The scale of furniture industry in China has been kept rapid growing with significant increasing of production value. But it is getting more and more difficult for traditional furniture companies to make profits with original equipment manufacturers（OEM） mode, which forces the traditional OEM furniture companies to upgrade and transform through different ways. In this article, the problems and challenges faced by the traditional OEM furniture companies were analyzed. Several models and experience of successful upgrading OEM companies were presented for reference to the other OEM furniture companies in China.  
        关键词：OEM furniture company;production;upgrading;transformation   
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      • GUO Ting,YANG Na,ZHOU Hai-bin,WANG Shuang-yong
        Vol. 34, Issue 3, Pages: 48-51(2020) DOI: 10.19455/j.mcgy.20200312
        摘要：Traditional dwellings in southwest China were built and adapted to nature with unique structural performance. But further improvements are needed in many aspects. The authors analyzed problems of the traditional dwelling buildings in Southwest China from the aspects of structural performance, thermal insulation performance, sound insulation performance as well as fire resistance performance. They summarized research progress and improvement measures on performance of the traditional dwellings. Suggestions were also provided for reference to further research to promote the traditional dwellings adapting to the needs of modern life.  
        关键词：traditional dwelling;structural performance;thermal insulation;sound insulation;fire protecting   
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        Practical Techniques

      • FU Zong-ying,CHEN Yuan,GAN jia-bing,ZHOU Yong-dong,REN Hai-qing
        Vol. 34, Issue 3, Pages: 52-55(2020) DOI: 10.19455/j.mcgy.20200313
        摘要：Native oriental oak（Quercus variabilis） lumber with 25 mm of a nominal thickness was dried in a conventional kiln. The drying schedule was evaluated. According to China national standard of Drying Quality of Sawn Timber, the drying rate, the final moisture content, the deviation of moisture content in thickness, the residual stress and drying quality of the samples were measured. The results showed that the optimal drying time was 19.5 days and 0.096%/h of the average drying rate. The deviation of moisture content in thickness met the 1st grade requirements of China national standard, and the final moisture content and the residual stress met the 2nd grade requirements. The overall drying quality of native oriental oak lumber met the 2nd grade of China national standard GB/T 6491-2012.  
        关键词：Oriental oak;lumber;conventional drying;drying schedule;drying quality   
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      • SUN Hong-jie,MENG Guang-yao,WANG Zhen-hua,GUO Bin
        Vol. 34, Issue 3, Pages: 56-58(2020) DOI: 10.19455/j.mcgy.20200314
        摘要：Aiming at protecting rotary veneer lathes from metal debris exited in logs, new devices composed of metal detectors and eddy current sensors which was used to enhance detecting sensitivity were installed in log conveyors of a rotary veneer production line. In addition, a U-shaped groove with a hydraulically controlled baffle was also used to disengage the logs which were detected to contain metal debris inside. The system could be helpful to protect rotary veneer production lines.  
        关键词：rotary veneer production line;log conveyor;metal detection device;disengaging device   
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