最新刊期
      期 2 ， 2020

        Research & Development

      • LIU Qiang-qiang,CHAI Yu-bo,LIU Jun-liang,LYU Wen-hua
        Vol. 34, Issue 2, Pages: 1-5(2020) DOI: 10.19455/j.mcgy.20200201
        摘要：Samples of poplar wood were respectively impregnated with Phenol-Melamine-UreaFormaldehyde resin（PMUF）, PMUF-boron（PMUF-B） compound and PMUF-silicon（PMUF-Si） compound, which were prepared by the authors at their laboratory. Results showed the density, MOE, MOR, hardness of the samples were increased, meanwhile, moisture absorption rate and water uptake rate were reduced. The anti-swelling efficiency of the modified wood samples was above 50%. The impact toughness of the modified wood samples was slightly decreased. The oxygen index of the modified wood samples was above one time higher than the controlled samples. The formaldehyde emissions of the modified wood samples were lower than 0.3 mg/L. The total volatile organic compounds of the modified wood samples were lower than 0.20 mg/（m2·h）. The decay resistance of the modified wood samples was significantly improved.  
        关键词：poplar wood;compound;phenol-melamine-urea-formaldehyde（PMUF） resin;boride;silicide   
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      • HU Ji-hang,LIU Jun-liang,FAN Shu-tong
        Vol. 34, Issue 2, Pages: 6-9(2020) DOI: 10.19455/j.mcgy.20200202
        摘要：Glyoxal-urea resins（GU） were synthesized from glyoxal and urea at six ratios respectively, and then used for rubberwood modification. The results showed that at G∶U ratio of 1.6, the resin performed best in the solid content, the viscosity, the water solubility and the storage life. Rubberwood samples were impregnated with the GU resin at a concentration of 30%. Modulus of elasticity（MOE） and modulus of rupture（MOR） of the treated rubberwood samples were increased by 21% and 32.5%, respectively, comparing with untreated control samples. Dimensional stability（ASE） of the treated samples reached 65.9% as well.  
        关键词：glyoxal-urea resin（GU）;ratio;rubberwood;modification;property   
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      • WU Mu-ting,QU Wei,SONG Wei,WU Yu-zhang
        Vol. 34, Issue 2, Pages: 10-13(2020) DOI: 10.19455/j.mcgy.20200203
        摘要：Samples of flame-retardant decorative plywood were detected by single burning item test（SBI） and cone calorimeter test（CONE）. The result showed that the heat release rate（HRR） and total heat release（THR） of the samples were decreased, the smoke production rate and total smoke production of the samples were inhibited, and the wood charring rate of the samples was reduced. The performance of the tested samples could meet the requirement of Grade B1（B） of GB 8624—2012 and could be used as the wall covering material in timber construction. This characteristic plays a key role in improving the fire safety of timber construction. Meanwhile, fabricated light-frame structure could be improved by integrating structural support, fire resistance of wood frame, interior decoration, and flame retardancy.  
        关键词：fire resistance;fabricated light-frame structure;decorative plywood;sheathing;flame retardant performance   
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      • ZHAO Xiu,WANG Hong-di
        Vol. 34, Issue 2, Pages: 14-18(2020) DOI: 10.19455/j.mcgy.20200204
        摘要：An environment chamber simulating ground heating was developed for testing formaldehyde emissions from wood-based flooring used in ground heating system. The formaldehyde emission testing results from the chamber and a conventional 1-m3 climate chamber were compared. The formaldehyde emissions measured by the simulation chamber were lower than that by the conventional 1-m3 climate chamber at the same temperature and humidity level. The simulation chamber presented a closer real ground heating environment.  
        关键词：laminated wood flooring;ground heating environment simulation chamber;conventional 1-m3 climate chamber;integral heating;formaldehyde emission;testing method;emission rate   
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      • YAN Ting-ting,CHEN Yuan,WANG Qian,SHANG Li-li,LI Gai-yun
        Vol. 34, Issue 2, Pages: 19-23(2020) DOI: 10.19455/j.mcgy.20200205
        摘要：By analyzing alcohol extractive content, density, GC-MS and HPLC data of agarwood samples in different qualities, agarwood quality factors were determined. Then an agarwood grading model was established by combining multivariate analysis methods, such as principal component analysis（PCA）,linear discriminant analysis（LDA） and random forest. The results showed that the contents of alcohol extractive, chromones as well as sesquiterpene type and contents from the Sin Chew system agarwood in different quality were obviously distinct. Therefore, factors including the content of alcohol extractive, the total content of sesquiterpenoids, and the content of 2-（2-phenethyl） chromone could be used for quality classification of agarwood.  
        关键词：GC-MS;HPLC;agarwood;quality assessment   
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        Discussion & Suggestion

      • WENG Xiang,ZHOU Yong-dong,FU Feng,LIN Lan-ying,JIANG Jing-hui
        Vol. 34, Issue 2, Pages: 24-28(2020) DOI: 10.19455/j.mcgy.20200206
        摘要：Microwave treatment can increase wood permeability by changing microstructure of wood. The effectiveness of the microwave treatment rely on destructiveness of the wood microstructure. The author presented a comprehensive literature review of research progress on microstructural changes and destructive mechanism of wood after the microwave treatment, Then discussed current challenges faced in the research field. Suggestions like establishing micromechanical models and improving observations in the research field should be given more attention in future.  
        关键词：microwave treatment;microstructure;permeability;destructive mechanism   
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      • LIU Mei-hong,PENG Li-min,LYU Shao-yi,LYU Jian-xiong,GAO Yu-lei,FAN Zheng-qiang
        Vol. 34, Issue 2, Pages: 29-33(2020) DOI: 10.19455/j.mcgy.20200207
        摘要：The authors summarized the influencing factors and parameters of acoustic vibration performance of wood for musical instruments by combining the performance requirements and performance evaluation indexes from the points of macroscopic to microscopic characteristics as well as physical-mechanical properties of wood. They also reviewed the research and application progress of chemical, physical and biological treatment methods to improve acoustic vibration performance of wood, as well as the problems existed in the above-mentioned treatments, aiming at providing reference for future research and development of functional improvement of wood acoustic vibration characteristics.  
        关键词：wood for musical instrument;acoustic vibration characteristics;evaluation indicator;functional improvement   
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      • SUN Zhi-min,MENG Bo,WANG Zhen-yu,ZHANG Li-dong,LI Zhong-qiu,FU Xing-yang
        Vol. 34, Issue 2, Pages: 34-37(2020) DOI: 10.19455/j.mcgy.20200208
        摘要：Effects of test conditions on formaldehyde emissions from whole wooden furniture were studied using a 30 m3 large chamber. The results showed that the factor sequence of the test conditions on formaldehyde concentrations in air from the furniture samples was as follows: area bearing rate, temperature, air exchange rate and relative humidity. The area bearing rate, temperature and relative humidity were positively correlated to the formaldehyde emissions, while the area bearing rate was negatively correlated to the formaldehyde emissions.  
        关键词：test chamber;wooden furniture;formaldehyde emission;test conditions;area bearing rate   
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        Practical Techniques

      • WANG Xue-yu,REN Hai-qing,WANG Yu-rong,WU Yan-hua,CHEN Yuan,FU Zong-ying
        Vol. 34, Issue 2, Pages: 38-41(2020) DOI: 10.19455/j.mcgy.20200209
        摘要：The main mechanical properties of Sawtooth Oak（Quercus acutissima） and Oriental Oak（Q. variabilis）were tested according to Chinese national standards. The test results showed that the compressive strength parallel to grain, the modulus of elasticity and the bending strength level of the two oak wood samples were all at a high level, the toughness of the samples reached a very high level, and the hardness grades of the samples were both very high. The hardness of the samples in the three grain dimensions was ranked: transverse>tangential> radical. The shearing strength parallel to grain of the Sawtooth Oak wood samples was high, while that of the Oriental Oak wood samples was medium. In summary, the mechanical properties of the both Oak wood species are at the medium to the advanced level. Sawtooth Oak wood is superior to Oriental Oak wood in mechanical properties.  
        关键词：sawtooth oak;Oriental oak;mechanical properties   
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      • TAO Yu-bo,LI Peng,LIU De-xi,LIANG Chen
        Vol. 34, Issue 2, Pages: 42-44(2020) DOI: 10.19455/j.mcgy.20200210
        摘要：Wood carving boards as symbols of history and culture in different regions in China, are commonly used in traditional furniture, windows, doors and building decoration components. In order to conserve and inherit the folk sculpture techniques and design, a three-dimensional（3D） scanning technology was used to obtain the appearance features information of the carving boards. Then replicas of the carving boards were printed out by a 3D printer based on the appearance features information obtained. This technique initiates the creation of a wood carving board database, which is advantageous in research and teaching of the cultural wood carving tradition.  
        关键词：wood carving board;modeling;three-dimensional（3D） scanning;3D printing   
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      • XIAO Jia-yi,MA Yan,ZHOU Zhu,FANG Yi-ming
        Vol. 34, Issue 2, Pages: 45-48(2020) DOI: 10.19455/j.mcgy.20200211
        摘要：An inspection method of timber surface knots was developed based on Faster R-CNN model. The new method made the selection of knot features data-driven, adapted variation of wood species and knot types, and improved inspection accuracy efficiently. The test results showed that the positions and sizes of the knots were detected with 94.0% of inspection accuracy. The images of the four typical samples showed that the maximum errors of knot positions and sizes were 5 pixels and 7 pixels, respectively. The Faster R-CNN method was superior to OSTU-based method in the study.  
        关键词：Deep learning;knot detection;Faster R-CNN;defect positioning   
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      • MAO Yi-chao,HOU Jian-jun
        Vol. 34, Issue 2, Pages: 53-57(2020) DOI: 10.19455/j.mcgy.20200212
        摘要：In order to reuse massive used wooden cabinet furniture, technics and design were presented including refurbishing, remodeling, and reassembling. Cases of reusing the used wooden cabinets were analyzed and discussed for reference to upgrading the value and efficiency in making better use of the valuable wood resources.  
        关键词：used wooden cabinet;furniture;recycling;reuse;design   
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