最新刊期
      期 3 ， 2016

        Research & Development

      • MENG Fan-dan,WU Bing-ling,YU Yang-lun,YU Wen-ji
        Vol. 30, Issue 3, Pages: 5-8(2016) DOI: 10.19455/j.mcgy.2016.03.001
        摘要：The authors conducted an experiment using laminated veneer lumber（LVL）with 48 mm of thick veneers from fast-grown poplar and eucalyptus wood. The results showed that the LVL strength such as modulus of rupture, modulus of elasticity and shear strength all decreased with increasing veneer thickness, but still met the requirements of the National Standard GB/T 20241-2006. Moreover, the LVL made by thicker veneers could save glue consumption compared with conventional LVL.  
        关键词：veneer thickness;laminated veneer lumber（LVL）;physical and mechanical properties   
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      • GUO Fei,HUANG Rong-feng,LV Jian-xiong,GAO Zhi-qiang
        Vol. 30, Issue 3, Pages: 9-12(2016) DOI: 10.19455/j.mcgy.2016.03.003
        摘要：To evaluate effect of heating temperature and duration on brittleness properties of heat treated masson pine（Pinus massoniana）, the specimens were treated at temperatures between 170 ℃ to 230 ℃and heating duration between 2 to 8 hours, then subjected to a static bending test. Results revealed that the main reason for brittleness increase was reduced plasticity. In contrast, elasticity of heat treated samples was hardly affected. Brittleness of untreated masson pine was 22.26%, and increased to 33.64%89.01% after heat treating. No brittle failures of the control specimens were observed, while more than half the specimens showed brittle failures when treated at 230 ℃ for 6 or more hours.  
        关键词：wood heat treatment;Pinus massoniana;brittleness;static bending;brittle failure   
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      • OU’YANG Jing,LIN Lan-Ying,FU Feng,CAO Ping-xiang
        Vol. 30, Issue 3, Pages: 13-16(2016) DOI: 10.19455/j.mcgy.2016.03.004
        摘要：Effects of freezing pretreatment factors, including moisture content, freezing time and freezing temperature, on bulking degree and uniformity of Pinus sylvestris wood treated by microwave were investigated. The results showed that suitable moisture content of freezing pretreatment was 20%. When moisture content of the wood was over fiber saturation point, bulking degree was increased with rising of moisture content while bulking uniformity was decreased. Increasing freezing time had no remarkable effect on bulking uniformity but could enhance bulking degree. Freezing temperature at – 20℃ could get better bulking uniformity.  
        关键词：freezing pretreatment;microwave treatment;bulking degree;uniformity   
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      • JIA Shan-shan,LIU Ming,QING Yan,WANG Shuang,WU Yi-qiang
        Vol. 30, Issue 3, Pages: 17-20(2016) DOI: 10.19455/j.mcgy.2016.03.005
        摘要：The authors developed a facile one step sol-gel method with TEOS as a precursor and KH550 as a modifier for preparation of a superhydrophobic surface on wood substrate which aims to simplify previous preparation methods. Surface morphology and water repellency of the treated sample were tested, respectively. The results indicated that the micro-nano hierarchical structures, similar to lotus leaves, combining with low-surface-free-energy material transformed the treated Chinese fir samples from a hydrophilic surface to a superhydrophobic surface, with a contact angle(CA) of 151.5°and a sliding angle lower than 8°. After exposure in an air environment for one year, then being immersed in acidic and alkali solutions for 14 hours, washed by an ultrasonic environment for 25 min, the sample’s surface still possessed great hydrophobic property with CA larger than 140°.  
        关键词：wood;superhydrophobic surface;micro-nano hierarchical structures;sol-gel   
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        发布时间：2021-02-08
      • LI Qi-wei,TAN Gui-liang,SUN Jin,SU Yue-xiao,WANG Ye-sheng,ZHOU Lin,ZHU Shuang
        Vol. 30, Issue 3, Pages: 21-24(2016) DOI: 10.19455/j.mcgy.2016.03.006
        摘要：To clarify phylogenetic relationships among different species of genus Dalbergia, genetic analysis was carried out for Dalbergia odorifera using its r DNA-ITS sequence as molecular markers. Total DNA was extracted with a modified CTAB method, and r DNA-ITS regions were amplified with universally conserved primers. The results showed that, based on molecular biology methods of r DNA-ITS sequence analysis, accurate molecular identification could be realized in genus Dalbergia so as to provide molecular evidence for taxonomy and identification of different species in genus Dalbergia.  
        关键词：Dalbergia odorifera;DNA extraction;ITS sequence;molecular identification   
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      • YU Hang,LIU Jin-hao
        Vol. 30, Issue 3, Pages: 25-28(2016) DOI: 10.19455/j.mcgy.2016.03.007
        摘要：The authors designed a tree branch collecting and conveying device and selected eucalyptus branches at 52.76% of moisture content and 10~40 mm in diameter to conduct a compression experiment using 50 mm/min compression speed and 50 k N for the highest loading force. They built three compression models to analyze the relationship among pressure, displacement, compression density and bulk modulus of the eucalyptus branches. They proposed that the optimum parameters were 169.349 kg/m3 of compression density and 0.012 MPa of pressure so as to keep the branches with their original state and maintain their value for subsequent processing.  
        关键词：eucalyptus branch;compression characteristics;model;pressure;displacement;density;bulk modulus   
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        Review

      • HUANG Jing-da,LV Shao-yi,WANG Si-qun,FU Feng,HU La
        Vol. 30, Issue 3, Pages: 29-32(2016) DOI: 10.19455/j.mcgy.2016.03.009
        摘要：As a green, renewable and biodegradable material, cellulose-based materials have excellent biocompatibility and are a widely available resource. Their rough structures have an advantage for modification of surface wettability. In this paper, the authors reviewed concepts and modification principles of wettability, summarized technologies of controlling surface wettability in hydrophobicity, superhydrophobicity and hydrophilicity-hydrophobicity directions as well as focused on surface superhydrophobicity modification technology of cellulose-based materials.  
        关键词：Cellulose-based materials;wettability;contact angle;Surface free energy;superhydrophobicity   
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        发布时间：2021-02-08
      • SONG Bo-qi,PENG Li-min,FU Feng,WANG Dong,LIU Mei-hong
        Vol. 30, Issue 3, Pages: 33-37(2016) DOI: 10.19455/j.mcgy.2016.03.010
        摘要：Blocking propagation of sound waves with sound insulation materials is one of the most important methods to control indoor noise. In this article, the authors reviewed current situation of sound insulation properties of wood-based panels and wood/polymer composites, presented applications of wood-based sound insulation materials for doors and partitions of buildings, and provided suggestions for further research and development of wood-based sound insulation materials.  
        关键词：wood-based material;composite;sound insulation property;sound transmission loss   
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        发布时间：2021-02-08

        Discussion & Suggestion

      • ZHAO Rong-jun,WANG Li,ZHANG Jun-zhen,ZHONG Yong,LIN Li-min,REN Hai-qing
        Vol. 30, Issue 3, Pages: 38-40(2016) DOI: 10.19455/j.mcgy.2016.03.011
        摘要：In order to analyze the mechanical properties of laminated veneer lumber(LVL) used in wood construction, the authors selected LVL specimens with different dimensions to test tension strength and compression strength parallel to grain. The results showed that the tension strength of the samples was influenced by the length, and the tension strength decreased as length increased. Moreover, the compression strength of the samples was also significantly affected by the length and the transverse dimensions, which decreased as the length and the transverse dimensions increased.  
        关键词：LVL;dimension effect;tension strength;compression strength   
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        发布时间：2021-02-08
      • ZHANG Ya-mei,YU Yang-lun,LI Chang-gui,YU Wen-ji
        Vol. 30, Issue 3, Pages: 41-44(2016) DOI: 10.19455/j.mcgy.2016.03.012
        摘要：The authors conducted a series of experiments to evaluate feasibilities of making scrimber from low density wood, such as Paulownia, Populus and Salix species. The technological characteristics and properties of the scrimber were tested. The results showed that these three kinds of wood are suitable for making scrimber, when density ratio of the scrimber to solid wood was around 2.50, water resistance of paulownia scrimber was the best, modulus of rupture(MOR) and modulus of elasticity(MOE) of populusscrimber were the highest, and horizontal shear strength of salix scrimber was the biggest.  
        关键词：low density wood;crushed veneer;scrimber   
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      • Vol. 30, Issue 3, Pages: 57-58(2016) DOI: 10.19455/j.mcgy.2016.03.018
        摘要：<正>"国际地板高峰论坛暨第四届世界地板大会"2016年3月在上海召开,会议由中国林产工业协会主办,中国林科院木材工业研究所、中国林产工业协会地板专业委员会和上海万耀企业展览有限公司联合承办,国家木竹产业技术创新战略联盟协办。来自20多个国家的300余位地板业人士参加了此届会议。围绕中美欧地板产业现状、发展机遇和要求的  
          
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      • Vol. 30, Issue 3, Pages: 58-59(2016) DOI: 10.19455/j.mcgy.2016.03.020
        摘要：<正>随着桉树加工业的迅猛发展,广西作为我国木材加工重要省份,其木材加工业区域发展情况如下:贵港市:作为广西木材加工最重要的城市,现有木材加工企业2680家,其中:胶合板企业332家,中纤板企业2家,刨花板企业5家,单板旋切企业1766家,家具企业254家。人造板年加工能力达450万m~3,2015年木材加工和造纸产值达130亿元。  
          
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        Piactical Techniques

      • LI Wei-guang,LU Zhi-wen,ZHANG Zhan-kuan
        Vol. 30, Issue 3, Pages: 45-48(2016) DOI: 10.19455/j.mcgy.2016.03.013
        摘要：An x-ray linear array transducer was used to scan standard samples of wooden doors and the radiation intensity changes were detected. Noise removing, non-linear gray transformation and morphological processing techniques were also used. The results showed that X-ray imaging technology could be used to identify internal material types, such as solid wood, fiberboard, particleboard, hollow particle board and honeycomb paper, etc, as well as structural characteristics of wooden door leaves. The technology can realize nondestructive testing of wooden door products, which not only saves timber resources, but also improves quality detection efficiency.  
        关键词：wooden door;internal structure feature;X-ray;image processing   
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      • GE Zhe-dong,HOU Xiao-peng,LI Zao-fang,ZHOU Yu-cheng
        Vol. 30, Issue 3, Pages: 49-52(2016) DOI: 10.19455/j.mcgy.2016.03.014
        摘要：The authors developed nondestructive testing equipment to automatically and efficiently determine log defects for better wood utilization. It is based on computed tomography(CT) technology which can reconstruct a two-dimensional image and a three-section image of wood by scanning wood cross sections. The images provided by the equipment clearly and accurately show the positions of annual rings, knots and cracks in the wood. Based on these CT scans, these internal structural features can be used for nondestructive testing and for timber classification.  
        关键词：nondestructive testing;wood;CT technology;three-section view;perspective drawing   
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      • HE Wen,JIN Hui,TIAN Jia-xi,LI Ji-ping,ZHANG Qi-sheng
        Vol. 30, Issue 3, Pages: 53-56(2016) DOI: 10.19455/j.mcgy.2016.03.015
        摘要：The authors developed a new kind of scrimber made with heat-treated crushed poplar strips. Properties of the scrimber were tested. The results showed that after heat treatment, the amount of free hydroxyl in the strips was reduced due to partial decomposition of hemi-cellulose. Water absorption, thickness swelling, modulus of rupture and modulus of elasticity of the scrimber all decreased significantly but hardness increased slightly.  
        关键词：Poplar;crushed strips;scrimber;heat treatment;thickness swelling;mechanical properties   
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