最新刊期
      期 5 ， 2019

        Research & Development

      • JIANG Peng,CHEN Zhi-lin,LIANG Shan-qing,ZHANG Long-fei
        Vol. 33, Issue 5, Pages: 1-6(2019) DOI: 10.19455/j.mcgy.20190501
        摘要：HPSA-UF resins were made from urea formaldehyde（UF）resins modified with fire-retardant agents of HPSA.HPSA/UF resins were also made by mixing traditional UF resins and HPSA.Traditional UF resins were used as controls.Three types of particleboards samples were made with the three resins mentioned above.Combustion and charring performance of the samples were investigated.The oxygen index value（LOI）of the samples made with the HPSA-UF resins increased by 31.6% compared with the control group.Based on cone calorimetry test results,the peak heat release rate 2 （pHRR2） of the samples made with the HPSA-UF resins was decreased while the peak time delayed.The effective combustion heat（EHC）data indicated that the HPSA-UF resins had positive fire-retardant effects at the condensed phase.It was concluded that the use of the HPSA-UF resins resulted in changes of thermal degradation pathway by increasing aromatic cyclization of the wood materials.  
        关键词：flame retardant;particleboard;modified urea formaldehyde resin;combustion behavior   
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        发布时间：2021-02-07
      • WU Hua-gui,LONG Ling,XU Jian-feng,CHEN Ming-gui,LIU Ru,CHANG Hong-yan
        Vol. 33, Issue 5, Pages: 7-10(2019) DOI: 10.19455/j.mcgy.20190502
        摘要：A UV-waterborne wood coating was prepared.Effects of coating solid contents and thicknesses on drying time and film performance of the coating were studied.The results showed that the film drying time decreased and moisture volatilization rate of the coatings increased,when coating solid contents increased and coating thicknesses kept the same.As the coating thickness increased,the film drying time extended.At the conditions of 35 ℃ drying temperature,80% of the solid coating content and 60 μm-thickness,the film drying time was 4 minutes.The hardness,adhesion and wear resistance value of the coating film could meet the requirements of Chinese Standard of GB/T18103-2013 for engineered wood flooring.  
        关键词：UV-waterborne wood coating;coating weight;coating thickness;coating solid content;drying time;coating film performance   
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      • HU Ji-hang,LIU Jun-liang
        Vol. 33, Issue 5, Pages: 11-15(2019) DOI: 10.19455/j.mcgy.20190503
        摘要：Compressed-air explosion pretreatments were used to improve the permeability of rubber wood veneers.Dyeing effects of the rubber wood veneer samples before and after treatments were compared.Under different pressure and explosion times,surface characteristics and micro pore of the veneer samples were observed with electron microscopy and mercury intrusion porosimetry.The results showed that the pressure of the compressed-air explosion treatments had significant effect on dye-uptake and surface darkness of the rubber wood veneer samples.Under optimal pretreatment conditions e.g.0.4 MPa of air pressure for 4 times,the dye-uptake and surface darkness of the samples increased by 22.76% and 19.69%,respectively.The mercury intrusion porosimetry results showed that the porosity and average pore diameter of the samples increased significantly and the specific surface area was slightly enlarged after the pretreatment,which was useful for dyes to better penetrate into wood.  
        关键词：Rubber wood;veneer;compressed-air explosion;pretreatment;wood dyeing;dye-uptake;surface darkness   
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        发布时间：2021-02-07
      • CUI Yong,HOU Xiao-peng,ZHANG Guo-liang
        Vol. 33, Issue 5, Pages: 16-19(2019) DOI: 10.19455/j.mcgy.20190504
        摘要：The Integral Separation PID Cascade Algorithm was adopted to develop a temperature control system including two control loops（major and minor）for continuous-presses of wood-based panels,in order to solve problems of using Single-stage PID Algorithm method.Meanwhile,the modular control program and monitoring interface were also designed accordingly.The trial tests showed that the accuracy of hot press temperatures were significantly improved due to the synergistic effect of the major and minor control loops.  
        关键词：wood-based panel;continuous-press;temperature control;integral separation PID;cascade algorithm   
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        发布时间：2021-02-07

        Review

      • GONG Ying-chun,LOU Wan-li,LI Ming-yue,REN Hai-qing
        Vol. 33, Issue 5, Pages: 20-24(2019) DOI: 10.19455/j.mcgy.20190505
        摘要：The authors introduced the present situation of timber structure industry in China,including timber resources,relevant standard systems and policy support,as well as material preparation,design methods and processing technology for timber structure.Suggestions were proposed on high quality development of the timber structure industry in China.  
          
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      • WU Guo-fang,ZHONG Yong,GONG Ying-chun,REN Hai-qing
        Vol. 33, Issue 5, Pages: 25-29(2019) DOI: 10.19455/j.mcgy.20190506
        摘要：The research status of structural performance of tenon-mortise joints,timber frames connected with tenon-mortise joints and reinforcement of the joints were reviewed.The relevant problems were also analyzed.Taking into development of modern engineered wood materials and manufacturing technology,the application prospect of the joints in modern timber structure and the future research needs were presented,in order to promote the inheriting of traditional timber structures and innovation of modern timber structures.  
        关键词：timber structure;tenon-mortise joint;column and beam connection;semi-rigid joint;reinforcement   
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        发布时间：2021-02-07
      • WANG Xue-yu,WANG Yu-rong,GONG Ying-chun,REN Hai-qing
        Vol. 33, Issue 5, Pages: 30-33(2019) DOI: 10.19455/j.mcgy.20190507
        摘要：The authors reviewed resource distribution,wood properties as well as processing and utilization status of native oak timber in China,and analyzed the existing problems in utilization of the timber.Suggestions were provided in reference to efficient processing and utilization of the timber.  
        关键词：oak;native timber;wood property;processing technology   
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        发布时间：2021-02-07
      • YANG Sheng,CHEN Yuan,YAN Ting-ting,LI Gai-yun
        Vol. 33, Issue 5, Pages: 44-48(2019) DOI: 10.19455/j.mcgy.20190510
        摘要：Imported Pinus radiata wood samples were treated under different temperatures and the chemical compositions of the samples were analyzed.Results showed that the extract contents of the samples decreased while pH value and buffering capacity of the samples all increased.When heating temperatures were elevated,there were no significant changes of lignin structure between heartwood and sapwood of the samples but more broken linkages（β-O-4’ Aryl ether bond）of the lignin structure units were observed.  
        关键词：Pinus radiata;heat-treatment;heartwood;sapwood;extracts;buffering capacities;lignin   
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        发布时间：2021-02-07
      • ZHOU Fan,FU Zong-ying,GAO Xin,ZHOU Yong-dong
        Vol. 33, Issue 5, Pages: 49-52(2019) DOI: 10.19455/j.mcgy.20190511
        摘要：Mahogany wood samples were heat-treated at five temperatures ranged from 150 and 210℃ for 4 hours,respectively.Another two groups of Mahogany wood samples were treated at 180 ℃ for 2 and 6 hours,separately.The dimensional stability and mechanical properties of the samples were tested.The results showed that the equilibrium moisture content（EMC）and swelling values of the samples decreased while increasing treating temperatures and times.This trend led to the increase of the moisture excluding efficiency and anti-swelling efficiency of the wood.The modulus of elasticity（MOE）of the samples decreased significantly when the heating temperature was above 180 ℃.The modulus of rupture（MOR）of the samples decreased gradually with the increment of heating temperatures.The MOE and MOR of the samples treated at 180 ℃ decreased gradually until reaching stable values when the treating time maintained from 2 hours to 6 hours.  
        关键词：Mahogany wood;heat treatment;Equilibrium moisture content（EMC）;dimensional stability;mechanical properties   
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        发布时间：2021-02-07

        Discussion & Suggestion

      • YIN Meng-ting,LI Bo-tao,LU Bin,FU Yue-jin,YANG Fan,ZOU Xian-wu
        Vol. 33, Issue 5, Pages: 34-38(2019) DOI: 10.19455/j.mcgy.20190508
        摘要：The 1 m3 climate chamber method is one of the main and important tools to determine formaldehyde emissions from wood-based panels.In order to improve the accuracy of test results,the detection limits and uncertainty of the 1 m3 climate chamber method were studies.The results showed that the detection limit of a 50 mm optical path colorimeter was not very high,which would be suitable for following formaldehyde emission tests.As for wood-based panels with low formaldehyde emissions,the uncertainty derived from duplicated measurements took a major contribution to the overall uncertainty.  
        关键词：1m3 climate chamber;wood-based panels;formaldehyde emission;detection limit;uncertainty   
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        发布时间：2021-02-07
      • LIU De-xi,LI Peng,TAO Yu-bo
        Vol. 33, Issue 5, Pages: 39-43(2019) DOI: 10.19455/j.mcgy.20190509
        摘要：To explore potential applications of three-dimensional（3 D）printing technology in developing anti-compression/lightweight products with wood-plastic filaments,twelve infill patterns including six two-dimension and six three-dimension infill patterns were selected to prepare wood plastic composite specimens.The flatwise compression properties of the specimens were measured and analyzed.The two-dimension infill patterns presented high flatwise compression strength and modulus of compression.The three-dimension infill patterns were suitable for rapid prototyping in product design and manufacturing.The two-dimensional tri-hexagon infill pattern had good flatwise compression properties with high printing efficiency.  
        关键词：three-dimensional（3D） printing;fused deposition modeling（FDM）;infill patterns;flatwise compression properties   
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        Piactical Techniques

      • FU Ling,ZHANG Jing-zhi,NING Ting-Zhou
        Vol. 33, Issue 5, Pages: 53-56(2019) DOI: 10.19455/j.mcgy.20190512
        摘要：Effects of milling tool rake angles and cutting parameters on surface roughness of medium density fiberboard（MDF）were investigated.The results showed that the surface roughness improved with the increase of rake angles.While the increase of feed per tooth and/or cutting depth resulted in poorer surface roughness.The feed per tooth had the greatest effects on the machined surface,followed by the cutting depth and the rake angles.The optimum cutting condition obtained by range analysis were 12° rake angle,feed per tooth in 0.5 mm and cutting depth in 1 mm.The average surface roughness of the MDF samples was only 3.82 μm.  
        关键词：medium density fiberboard;milling;rake angle;cutting parameter;surface roughness   
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        发布时间：2021-02-07
      • LI Hai-yun,QIU Rong-bin,JIANG Hong,YE Da-peng
        Vol. 33, Issue 5, Pages: 57-60(2019) DOI: 10.19455/j.mcgy.20190513
        摘要：Based on the sub module control system design,a sawn timber sorting device was designed and developed.A single chip microcomputer,which controls transportation,separation and detection of sawn timber was used as the main control unit with multi sensors and contact switches as feedback information input.The test results showed that the prototype is reliable in separating sawn timber and detecting uneven colored and off-sized timber,which is helpful of improving automation and production efficiency of sawn timber sorting and detection.  
        关键词：sawn timber;sorting;modular design;color detection;thickness measurement   
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