最新刊期
      期 4 ， 2020

        Research & Development

      • QU Wei,WU Mu-ting,SONG Wei,WU Yu-zhang,MA Xing-xia
        Vol. 34, Issue 4, Pages: 1-4(2020) DOI: 10.19455/j.mcgy.20200401
        摘要：It is greatly significant to the inheritances of ancient building relics, by improving the fire resistance of timber structures. A flame-retardant primer coating resin was prepared, then applied on spruce and radiata pine samples at the laboratory. The mechanism of the wood ignition time and combustion behavior were explored. The results showed that the flame-retardant resin has a significant effect on extending the ignition time up to 9 minutes. The rapid heat release in the initial stage of wood combustion is effectively suppressed and the peak heat release rate is significantly reduced, and thereby the risk of spreading fire caused by heat convection and transfer is greatly reduced.  
        关键词：ancient timber structure;flame-retardant wood;flame-retardant resin;ignition time;combustion performance   
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      • ZHANG Nian-chun,ZENG Ling-wang,HE Xian-feng,YIN Yu-hua
        Vol. 34, Issue 4, Pages: 5-8(2020) DOI: 10.19455/j.mcgy.20200402
        摘要：In order to meet the requirement of high-performance waterborne wood lacquer products for wood-based panels, waterborne wood paints were developed in the laboratory. The formulation design and coating performance were evaluated. The emulsion and auxiliaries were selected for the corresponding system. The properties of the waterborne film applied on medium-density fiberboard（MDF） were tested. The results showed that at the ratio of acrylic emulsion and polyurethane modified acrylic emulsion of 35∶30, with 5% film builder and 20% titanium white pulp, the coating hardness reached 2H, the adhesion strength reached Grade 1 of GB/T 9286—1998. The resistance of the coating to vinegar and alcohol were excellent. The overall performance of the waterborne coating was optimal.  
        关键词：waterborne wood paint;polyurethane;acrylic;formula design;film performance;MDF   
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      • PAN Fang-qing,FENG Xin-hao,WU Zhi-hui
        Vol. 34, Issue 4, Pages: 9-12(2020) DOI: 10.19455/j.mcgy.20200403
        摘要：The physical and mechanical properties of Canadian aspen（Populus tremuloides Michx.） from Alberta were examined and compared with the properties of China native poplar. The physical properties of Canadian aspen were comparably similar to those of native poplar, while the Canadian aspen was slightly lower in density. The mechanical properties of Canadian aspen were higher than those of native poplar from China except the harness. The differential drying shrinkage and the rate of expansion between radial and tangential direction remained minor. Therefore, it was suggested that the Canadian aspen can be one of substitute species of native poplar used in furniture and handicrafts manufactory in China.  
        关键词：Canadian aspen;domestic poplar;physical and mechanical properties;comparison and analysis   
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      • ZHANG Xin-yu,DING Yu,ZHANG Jing,CHU De-miao,MU Jun
        Vol. 34, Issue 4, Pages: 13-16(2020) DOI: 10.19455/j.mcgy.20200404
        摘要：Using a greenhouse solar-dehumidification drying chamber at various modes, including open-mode, closed-mode and combined-mode, the drying process, the drying rate, the energy consumption and the quality of poplar veneer were evaluated. The results showed that under the conditions, at the air-dry kiln or closed-mode, the indoor temperature was about 23～27 ℃ higher than the outdoor temperature. When the veneer with an initial moisture content of 99.21% was pre-dried to 30%, the closed-mode drying took 3 h, and the drying rate was 21.39%/h, the energy consumption was 5.56 kW·h/m3. When the moisture content of veneer was reduced from 30% to about 12%, the closed-mode and open-mode drying process took 1 h and 3 h respectively, with corresponding drying rate of 16.56%/h and 5.7%/h. The closed-mode used the dehumidifier to recover heat while discharging water, which shortens the drying time. Compared with the combined mode, it can also reduce drying energy consumption.  
        关键词：greenhouse solar-dehumidification drying chamber;Poplar veneer;drying process;drying energy consumption   
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      • FAN Zheng-qiang,PENG Li-min,LIU Mei-hong
        Vol. 34, Issue 4, Pages: 17-20(2020) DOI: 10.19455/j.mcgy.20200405
        摘要：Cork/fiberboard laminate soundproof flooring was prepared by overlaying various thicknesses of cork-layer on top of fiberboards. The effect of the thickness of cork-layer on the impact sound pressure level of cork/fiberboard flooring was studied to determine the optimum cork-layer thickness. The results showed that the impact sound pressure level of the cork/fiberboard laminate soundproof floor is 74.1 dB, and the performance of soundproof is excellent. According to the results of multiple comparison analysis, and the cost of cork, the 2.4 mm thick cork-layer was an economically prime option for a pleasant soundproof performance. The properties of the soundproof flooring including the density and moisture content met the requirement of LY/T 1657—2015; and modulus of rupture（MOR） of the flooring met the requirement of GB/T 18102—2007.  
        关键词：cork;laminate floor;soundproof;impact sound   
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      • LI Wei-guang,WANG Ling-juan,BI Zheng-hao,CHENG Xian-bao,ZHAO Li-yuan,ZHANG Zhan-kuan
        Vol. 34, Issue 4, Pages: 21-25(2020) DOI: 10.19455/j.mcgy.20200406
        摘要：This paper reviewed the first automatically assembly line for laminated wooden doors made in China. The assembly line consists of the door frame material preparation, wood width and transportation, prefabricated parts storage and feeding system, door frame assembly system, core material feeding, panel feeding, door leaf assembly and door leaf system. A fully automatic flexible production line was formed, which actualizes manufacturing processes including frame processing, door core material filling, frame assembly and panel pressing before door assembling, hence the levels of the machine tools technology and manufacturing process of wooden doors were enhanced.  
        关键词：wooden door;automation;assembling;product line   
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        发布时间：2021-01-27

        Discussion & Suggestion

      • WANG Hong-qiang,HAI Ling-chao,CHEN Yue,CHEN Jie
        Vol. 34, Issue 4, Pages: 26-30(2020) DOI: 10.19455/j.mcgy.20200407
        摘要：This paper introduces the International Organization of Standard which is responsible for the revision of ISO standards for furniture, reviews the status of the standards by ISO/TC 136, and analyzed some problems of the current ISO standards for furniture in use. In the meantime, the Chinese team’s participation in the constitution and revision of ISO standards for furniture is described, and suggestions are provided for developing future ISO standards and more collaboration with Chinese furniture industry.  
        关键词：furniture;ISO standards;overview;suggestion   
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      • XU En-guang,LIN Lan-ying,LI Shan-ming,PENG Li-min,FU Feng
        Vol. 34, Issue 4, Pages: 31-37(2020) DOI: 10.19455/j.mcgy.20200408
        摘要：In this research, Mongolian scotch pine（Pinus sylvestris var. mongolica Litv.） was used as raw material to prepare microwave puffed wood. During the treatment, the maximum temperature at the center of the wood reached 183 °C. Microwave power density and initial moisture content and the interaction of these two factors showed a significant effect on the content changes of the three major components in the samples. The relative content of lignin increased compared with untreated wood, while the contents of cellulose and hemicellulose decreased less than 5%. The contents of cold water extractive, benzyl alcohol extractive, and 1% NaOH extractive of treated wood samples decreased with the escaping of water vapor during the treatment. The pH value of the puffed wood samples increased but the wood stayed acidic. The ash content remained unchanged.  
        关键词：microwave puffed wood;temperature;wood composition content;extractive content   
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      • PING Li-juan,LIU Jun-liang,WANG Xi-ming
        Vol. 34, Issue 4, Pages: 38-42(2020) DOI: 10.19455/j.mcgy.20200409
        摘要：The relationship between the moisture content and the extraction rate of Mongolian scotch pine（Pinus sylvestris var. mongolica Litv.） wood treated by high temperature and high humidity was investigated. The changes of microstructures such as resin channels, pits and thin-walled tissues were observed through a bio-optical microscope and a scanning electron microscope. The study found that the drying time with the high-temperature and high-humidity treatment was shortened from 33 hours to 18 hours; the average extracting speed was increased from 0.057%/h to 0.151%/h; and the gradient of extractive content along their thickness after drying was reduced from 0.84% to 0.31%. Compared with conventional drying, the wood resin channel was partially destroyed after high-temperature and high-humidity treatment, and the cell wall, pore plug and pore membrane were cracked. These structural changes are conducive to moisture and resin discharging.  
        关键词：Mongolian scotch pine （Pinus sylvestris var. mongolica Litv.）;steam treatment;high temperature drying;micro-structure;extraction rate   
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        发布时间：2021-01-27

        Practical Techniques

      • LIN Qi-zhao,WANG Yun-long,HE Xin,QIN Lei,QIU Jian
        Vol. 34, Issue 4, Pages: 43-47(2020) DOI: 10.19455/j.mcgy.20200410
        摘要：In order to extend the public use of identifying Chinese softwood species, an online softwood search system was developed based on the IAWA List of Microscopic Features for Softwood Identification（IAWA）, imitating the InsideWood Hardwood Database module. The retrieval system is a basis online system for the anatomical identification of more than 140 species of Chinese softwood. The database contains descriptions of anatomical characteristics and microscopic images. The experimental trial showed that the retrieval system can effectively identify softwood species based on microscopic features.  
        关键词：softwood;wood identification;computer-aided;microscopic features;retrieval system   
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      • YAN Ting-ting,CHEN Yuan,WANG Qian,SHANG Li-li,LI Gai-yun
        Vol. 34, Issue 4, Pages: 48-51(2020) DOI: 10.19455/j.mcgy.20200411
        摘要：The composition characteristics of petroleum ether extract from 72 heartwood samples of Santalaceae obtained from 5 species of Santalum and 1 species of Osyris were analyzed by Gas Chromatography-Mass Spectrometer（GC-MS）. Results showed that sesquiterpenes were the main petroleum ether extracts from the Sandalaceae heartwood. The compositions of volatiles from Santalum species were different from those from Osyris lanceolata. An identification model was developed to evaluate the major sesquiterpene content. For S. album, S. austrocaledonicum and S. yasi, the accuracy of identification by the model was above 94%.  
        关键词：Santalaceae;species identification;GC-MS   
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      • SHAN Ren-wei,ZHU Zhao-long
        Vol. 34, Issue 4, Pages: 52-55(2020) DOI: 10.19455/j.mcgy.20200412
        摘要：The influence of spiral angle, feeding speed and milling depth on the surface roughness of the laminate floor was investigated using an orthogonal experiment design. The experimental results showed: the surface roughness decreased with the increase of spiral angles, while the surface roughness increased with the increasing feeding rate and milling depth. The spiral angle of cutters had the greatest influence on the surface roughness, followed by milling depth and feeding rate respectively. The optimal cutting parameters for laminate flooring spiral milling were identified when the spiral angle, feeding speed, and milling depth were 70°, 60 m/min, and 0.4 mm respectively, aiming at greater cutting efficiency and quality.  
        关键词：laminate flooring coverings;spiral milling;spiral angle;surface roughness   
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      • CHI Yong-liang
        Vol. 34, Issue 4, Pages: 56-60(2020) DOI: 10.19455/j.mcgy.20200413
        摘要：The experiments on manufacturing laminate floor coverings under different variables of impregnated paper, substrate material, hot pressing process and conditioning time were carried out in order to find out the causes of warping deformation. The warp of the flooring was tested according to the national standard GB/T 18102—2007. The results showed that the warping deformation and density of fiberboard for flooring substrate, the temperature difference between the upper and lower hot platens in hot pressing process, and the combination of impregnated paper, had effects on warping deformation of laminate floor coverings.  
        关键词：laminate floor coverings;warping deformation;flooring substrate;impregnated paper;hot-pressing process   
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