最新刊期
      期 6 ， 2020

        Research & Development

      • XIONG Ling-ming,XING Xue-feng,LIN Lan-ying,ZHOU Yong-dong,FU Feng
        Vol. 34, Issue 6, Pages: 1-4(2020) DOI: 10.19455/j.mcgy.20200601
        摘要：Microwave treatment can cause macroscopic cracks in wood. The effects of moisture content,microwave powers, and treatment times on macroscopic cracks in the cross section of Mongolian scotch pine（Pinus sylvestris var. mongolica Litv.） after microwave treatment were investigated. Results showed that the moisture content and microwave powers had a significant influence on the microwave energy absorption by the Mongolian scotch pine samples. The number of cracks in the cross section of Mongolian scotch pine samples and crack area ratio reached the largest at 40%～60% of the moisture content, 140 k W of the microwave power and 120 seconds of the treatment time. It was suggested that different microwave treatment processes should be chosen accordingly based on the application of materials.  
        关键词：Mongolian scotch pine（Pinus sylvestris var.mongolica Litv.）;microwave treatment;high field intensity;microwave energy absorption;macroscopic cracks   
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        发布时间：2021-01-27
      • LI Lu-ming,MIN De-xiu,WENG Qi-zhen,CHEN Zhi-lin,LU Jin-han,JIANG Peng
        Vol. 34, Issue 6, Pages: 5-10(2020) DOI: 10.19455/j.mcgy.20200602
        摘要：The selection of a wood flame retardant system is closely related to its pyrolysis characteristics.To provide theoretical bases for thermal degradation and flame retardant system selection, the chemical composition and thermo gravimetric（TG） analysis experiments were conducted on the wood of teak（Tectona grandis） and catalpa（Catalpa bungei） from plantations, as well as using wood samples of Chinese fir（Cunninghamia lanceolata） and radiata pine（Pinus radiata） as control groups. The pyrolysis characteristics, thermal degradation kinetic models and parameters were explored. The results showed that:1) the pyrolysis process of the four wood species could be divided into four stages: water loss, transition,severe degradation and char-forming; 2) the temperature under maximum decomposition rate, activation energy and activation factor of teak and catalpa were lower than those of Chinese fir and radiata pine. The teak and catalpa wood are suitable for a flame retardant system with relatively lower thermal decomposition temperature.  
        关键词：teak（Tectona grandis）;catalpa（Catalpa bungei）;pyrolysis characteristics;pyrolysis kinetics;flame retardant system   
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        发布时间：2021-01-27
      • ZOU Miao,GUO Wen-jing,TANG Qi-heng
        Vol. 34, Issue 6, Pages: 11-14(2020) DOI: 10.19455/j.mcgy.20200603
        摘要：Poplar fibers and phenolic resin were used to prepare high density fiberboard（HDF） with different densities and resin contents. The mechanical properties, thickness swelling and water absorption properties were tested. The effects of density and resin content on mechanical properties, water resistance and microstructure of HDF were explored. The results showed that with the increase of density and resin content, the thickness swelling and water absorption of HDF decreased, while the mechanical properties of HDF increased. When the density was at 1.1 g/cm3 with a resin content of 10%, the water resistance and mechanical properties of the board reached the optimum respectively. The mechanical properties of the prepared fiberboard met the strength requirement of GB/T 31765 — 2015 High Density Fiberboard（HDF-GP HMR）.  
        关键词：high-density fiberboard;resin content;density;water resistance;bending strength   
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      • XI Fei,RUAN Xue-jun,SUN You-fu
        Vol. 34, Issue 6, Pages: 15-19(2020) DOI: 10.19455/j.mcgy.20200604
        摘要：The common light-frame wood structure wall was reformed in a laboratory. The influences of steady-state heat transfer were explored at various factors, including different insulation materials, wall stud size, and type and thickness of sheathing. The 400 mm-gap between studs was filled with lab-made straw brick as an insulation material and the sheathing panel was covered on both sides by oriented structural straw board（OSSB） and plasterboard. The heat transfer coefficient of the wall was measured at0.41 W/（m2·K） and 0.45 W/（m2·K） in winter and summer respectively, and the thermal inertia index was3.22. This research design can provide an energy-saving solution for the insulated light-frame wood wall construction for both winter and summer.  
        关键词：light-frame wood structure;energy saving wall;steady-state heat transfer;thermal performance   
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        发布时间：2021-01-27
      • ZHOU Yang-fan,LYU Xing-cong,ZHANG Tao,CHEN Yi-bin,LYU Shi-hao,SUN Li-chao
        Vol. 34, Issue 6, Pages: 20-24(2020) DOI: 10.19455/j.mcgy.20200605
        摘要：Veneer overlaying on the surface of wood-plastic composite materials is an effective method to enhance solid wood appearance and improve its decorative performance. To solve the problem in the surface bonding of polyethylene-based wood-plastic composites（WF/PE）, two thermoplastic resins were selected as bonding materials, and the two separate pressing process was used for veneer processing. The appearance qualities, surface bonding strengths and immersion peeling length of composite panels were tested. It was found that the best performance was achieved by using MAPE film as a bonding material under subsection hot-press time of 160 seconds plus 60 seconds, under the press temperature of 150 ℃ and the press pressure of 1.5 MPa. The SEM characterization showed that the MAPE film as a bridge promoted the formation a firm interface between veneer and WF/PE composites substrates.  
        关键词：wood fiber/polyethylene composites;MAPE film;veneer overlaying;subsection hot-pressing;interface bonding   
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        发布时间：2021-01-27
      • LU Zhi-hua,LIU Bao-xuan,LI Jia-wei,FU Jia-jia
        Vol. 34, Issue 6, Pages: 25-29(2020) DOI: 10.19455/j.mcgy.20200606
        摘要：In order to make environment-friendly cork floors with antimicrobia and antibacterial functions,two antibacterial agents（a nano silver compound and a titanium dioxide silver compound） were added into the water-based coating paint. The effects of the type and quantity of antibacterial agents on the floor performance were analyzed. The results showed that the both antibacterial agents had no effect on the floor physical properties, but they improved the antibacterial performance of cork floors significantly. A better anti-Staphylococcus aureus action was observed than the anti-Escherichia coli action. Cork flooring is naturally mold and mildew resistant, while the both added antibacterial agents showed a weak mildew resistant effect. It was suggested that the improvement of antimicrobia performance could be obtained by the addition of little mildew-resistant agent.  
        关键词：cork floors;inorganic antibacterial agent;water-based paint;antibacterial capability;physical properties   
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        发布时间：2021-01-27
      • GU Shui-xiang,MA Qing-ru,GAO Shui-chang,AO Jing-wei,PAN Jin-ya,GUI Cheng-sheng,ZHAO Jian-zhong
        Vol. 34, Issue 6, Pages: 30-33(2020) DOI: 10.19455/j.mcgy.20200607
        摘要：To develop water-borne UV curable coatings for wooden floorings, the authors analyzed the existing problems and causes associated with the water-borne flooring coatings. The types of water-borne UV coatings, wood species, optimization of drying and curing process were investigated to develop optimized water-borne UV curable coatings and manufacturing process. The physical properties of floorings produced at the optimum manufacturing process were tested according to the Standards of LY/T1859—2009 "Antique style flooring" and Q/YFL 0035—2018 "Wooden floorings coated with water-borne UV varnishes ". The results showed that the wear resistance of the floor surface was less than 0.15 g/100 r,the coating hardness was better than 1 H, the coating adhesion was Grade 1～2, and TVOC was less than200 ug/m3, which met the requirements of the standards.  
        关键词：water-borne ultraviolet（UV） curable coatings;wooden floorings;process and technology;coating hardness   
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        发布时间：2021-01-27
      • LI Xiao-Min,HUANG Dong,CHEN Qi-Yu,LI Ping,DENG Zhi-Wen,DUAN Xian-Yun
        Vol. 34, Issue 6, Pages: 34-38(2020) DOI: 10.19455/j.mcgy.20200608
        摘要：A 3 D unsteady simulation model was developed for the air flow and waste particle distribution in the chip removal system of the panel-furniture edge banding machine using Fluent software with sliding mesh technologies and the discrete phase model. It was found that the pressure loss at the inlet and outlet of the origin chip removal system was relatively large, and the capability of adsorbing waste chips was weak. According to the analysis, the structure of the chip removal system was optimized. Compared with the original system, the pressure loss at the inlet and outlet was reduced by 64.1%, and the chip removal rate was increased by 30% in the optimized system under the conditions of tool speed at 10,000 r/min and outlet wind pressure of-1,700 Pa. Testing were performed on the chip removal system before and after the optimization. The results showed that the chip removal efficiency was greatly improved after the optimization, and the pilot testing was consistent with the simulation performance.  
        关键词：edge banding machine;chip removal system;simulation optimization;panel-furniture   
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        发布时间：2021-01-27

        Review

      • XU Jia-he,WANG Chao,ZHANG Bin
        Vol. 34, Issue 6, Pages: 39-43(2020) DOI: 10.19455/j.mcgy.20200609
        摘要：The conservation of cultural heritage is an exceptional foundation for inheriting historical culture, enhancing national unity, ensuring national security, and enduring peace and stability. This paper reviews the history of conservation projects led by research teams from Chinese Research Institute of Wood Industry. The existing relevant technologies and their application of protecting timber structures of ancient architectural buildings are summarized. The review of current wood protection technologies and practices reveals the conceptual trend of the development in ancient timber structure conservation.  
        关键词：Chinese research institute of wood industry;ancient timber structure member;wood relics;wood protection technology   
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        发布时间：2021-01-27

        Discussion & Suggestion

      • ZHAO Xiu,WANG Hong-di,JIA Xiao-ran,SHI Lan-cui
        Vol. 34, Issue 6, Pages: 44-47(2020) DOI: 10.19455/j.mcgy.20200610
        摘要：A method of calculating bearing capacity of wooden flooring used in ground heating systems was constructed based on the formaldehyde emission limit from wooden flooring and the formaldehyde concentration limit of indoor air. The principles of the calculation method were introduced and the function was verified by experimental research. The corresponding relation between the flooring product standard and indoor air quality standard was established. This study built a theoretical foundation for formulating an standard of bearing capacity specification of wooden flooring used in ground heating systems.  
        关键词：wooden flooring used in ground heating systems;formaldehyde emission limit;formaldehyde concentration limit of the indoor air;flooring bearing capacity   
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      • LIU Meng-meng,PENG Li-zheng,GAO Cui-ling,ZHU Hai-ou,CHEN Chun-zhu,PENG You,HAN Qing-sheng
        Vol. 34, Issue 6, Pages: 48-52(2020) DOI: 10.19455/j.mcgy.20200611
        摘要：Different adsorbents have distinctive adsorption selectivity for volatile organic compounds（VOC） in furniture. In order to expand the detection and analysis range of potential VOC in furniture products, five common adsorbents used in VOC monitoring field（Carbotrap TM, activated carbon,Carbosieve TM S-Ⅲ、Carbopack B/Carbosieve TM S-Ⅲ and Tenax TA） were tested for their penetrability.Carbopack B/Carbosieve TM S-Ⅲ and Tenax TA were selected to be used in furniture sample tests. The results show that Tenax TA has a poor adsorption and trapping effect on Acetone, benzene, ethyl acetate and terpene compounds, while Carbopack B/Carbosieve TM S-Ⅲ has a good adsorption and trapping effect,which can be effectively applied in the adsorption capture and detection analysis of VOC in furniture.  
        关键词：furniture;volatile organic compounds;adsorption material;penetration rate;trapping effect   
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        Practical Techniques

      • YANG Fei,LIU Le-qun,WU Qiao-li,LIU Zhen-tao,HUA Ya-ting
        Vol. 34, Issue 6, Pages: 53-57(2020) DOI: 10.19455/j.mcgy.20200612
        摘要：The molded pallets were made from wood particles blended with phenolic formaldehyde adhesive. Effects of resin content, hot-press temperature and hot-press time on the physical and mechanical properties of molded pallets were investigated using an orthogonal design method. The the optimization of processing parameters was found at 20% of resin content, 200 ℃ of hot-press temperature and 10 min of hot-press time. The moisture content, the density and the thickness swelling ratio after 24-hour water soaking and the bending resistance of molded pallets met the requirements of GB/T 30672 — 2014"Moulded flat pallets from plants fiber" respectively.  
        关键词：molded pallet;phenolic resin adhesive;resin content;hot-press parameter;mechanical properties   
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      • LIU Xiao-ling,CHEN Song-wu,CHEN Yan,LUO Yu-fen,LIN Jia-chun,CHEN Gui-dan
        Vol. 34, Issue 6, Pages: 58-62(2020) DOI: 10.19455/j.mcgy.20200613
        摘要：In order to determine the optimal air-drying schedule for E. grandis×E. urophylla wood, the study explored different packing methods（well-packing, no-sticker crisscrossed-packing, and crisscrossed-packing） and drying conditions（air-drying with a shed, open-air-drying without a shed）,comprehensive consideration of sawn timber drying rate, drying quality defects, space utilization and accumulation efficiency. The results show that the drying rate is the fastest at the open-air without a shed condition using the well-packing method; the best lumber quality was gained with crisscrossed-packing air-drying with a shed. This study provides multiple air-drying schedules for manufacturers to choose based on production needs.  
        关键词：E.grandis×urophylla;packing methods;air-drying condition;influencing factors   
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