最新刊期
      期 0 ， 2020
      • Luo Tushou Shi Zhenhua
        Issue 4, (1998) DOI: 10.19455/j.mcgy.1998.04.006
        摘要：Acacia mangium Plantation wood was tested for its natural resistance against decay fungi,natural durability,treatability and preservation.The results showed that:(1)Dry weight losses of the wood caused by Coriolus vericolor and Poria placenta were 3662% and 3574% respectively.The natural decay resistance of the wood was in the range of nonresistance and slightresistance class,and the natural durability belonged nondurable class as its natural durable life was less than 2 years.(2)The wood was easily treated with preservatives by room temperature/nonpressure steeping,hot and cold bath process and Lowry process.The natural decay resistance of the wood could be raised to highresistance class when treated with 3% CCB,TWP or BU preservatives.  
        关键词：Acacia mangium;Wood preservation;natural durability;impregnability   
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        发布时间：2021-03-12
      • John Z.Lu
        Issue 4, (1998) DOI: 10.19455/j.mcgy.1998.04.005
        摘要：A new wood preservative system,in which soy protein was introduced to chelate copper cations,has been investigated.Experimental results indicated that soy protein HM90 greatly improved leaching resistance of copper cations fixed in ponderosa pine sapwood.By adding 8 and 16 kg/m3 of soy protein HM90 in ammoniacal copper sulfate solution,the retention of treated wood after leaching was 70% of initial retention on average.Because of the chelation of soy protein,the retention of copper protein after leaching was increased by 40% on average compared with that without protein.Moreover,lower concentration of copper sulfate was preferred for fixation of copper protein.However,in comparison with copper sulfate,there seemed no significant improvement for copper protein in ponderosa pine blocks on decay resistance to brownrot fungus Postia placenta. The threshold retention of unleached blocks treated with copper protein was as the same as the treated only with copper sulfate.Further investigations and improvement were suggested.  
        关键词：Soy protein;Copper proteins;Chelating;Fixation;Leaching resistance;Threshold retention;Wood preservation   
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        发布时间：2021-03-12
      • Teng Tonglian Zhou Yongdong Meng Jingming Chen Shenglan Piao Chenhan
        Issue 4, (1998) DOI: 10.19455/j.mcgy.1998.04.001
        摘要：Moisture content(MC) distribution and water movement of both green and airdried boards from fastgrowing plantation wood along thickness direction during drying process were studied.In the same time,influence of drying temperature on drying rate in both surface layer and core layer was studied.Results showed that due to sawnlog’s MC varied in both radial and longitudinal directions,initial MC of testing boards was not the same.During drying,the MC distributions along the thickness direction of all testing boards were gradually changed into parabola distributions with low MC in surface layer and high in core layer.After equilibrium treatment,the MC in surface layer was almost equal to that in core layer.Although drying temperature had different influence in different stages of drying,the average drying rate increased with temperature rising.With same equilibrium moisture content(EMC),rising temperature made drying rate in core layer change more obviously than that in surface layer.  
        关键词：Fastgrowing plantation wood;MC;Drying temperature;Drying rate   
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        发布时间：2021-03-12
      • Issue 4, (1998) DOI: 10.19455/j.mcgy.1998.04.004
        摘要：Influence of processing factors on physicalmechanical properties of wood/plastic fiber composite materials was studied systematically.The factors include wood fiber pattern,pretreatment condition of polypropylene fiber,adhesives,composite mat uniformity and hot pressing conditions.The result showed that properties of the composite made under appropriate conditions could meet the demand of standard TLVW 494.  
        关键词：Wood/Plastic fiber composite materials;Polymer fiber;pretreatment;Molding performance   
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        发布时间：2021-03-12
      • Lu Bin Yang Fan
        Issue 4, (1998) DOI: 10.19455/j.mcgy.1998.04.009
        摘要：By sampling from MDF products from 11 manufacturing enterprises,internal deviation and standard deviation of MDF density were studied.The results showed that the internal deviation and standard deviation were related to specimen size,that the internal deviation could be less that 7%.Specimen size for density deviation test was suggested no less than 100 mm×100 mm.  
        关键词：MDF;density;Internal deviation of density;Standard deviation   
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        发布时间：2021-03-12
      • Zhang Biguang Zhao Zhongxin
        Issue 4, (1998) DOI: 10.19455/j.mcgy.1998.04.010
        摘要：This paper described classification of wood dehumidifing dryers and how to make right choice for the dryers.Influence of working conditions of the dryer on power consumption were analysed and suggestions of reducing power consumption were provided.  
        关键词：wood drying;Dehumidifier;power consumption   
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        发布时间：2021-03-12
      • Issue 4, (1998)
        摘要：信息快递简讯威力公司向中国优秀大学生颁发奖学金一个公司要生存和发展，人的因素起着重要的作用。在中国寻求发展的德国威力公司，不仅是生产优质四面刨铣机的世界顶尖企业，在吸纳人才和培养人才上也投入了世界一流的财力和精力，并为此推出了一个支持有才能年轻人的崭...  
          
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        发布时间：2021-03-12
      • Jia Xiangcheng
        Issue 4, (1998) DOI: 10.19455/j.mcgy.1998.04.011
        摘要：The article describes structure,working principle,design method and characteristics of general pneumatic dust collecting device with equal section main pipe for largescale wood processing mills.  
        关键词：Wood processing;Pneumatic dust collecting;Equal section main pipe   
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        发布时间：2021-03-12
      • Issue 4, (1998) DOI: 10.19455/j.mcgy.1998.04.008
        摘要：木材的数控加工与数控机床（三）李黎７数控机床效益分析７１加工复杂系数和机床投资比加工同一要求的工件，各种机床所用台时数是不同的，通常把普通机床需用台时Ｈｂ与数控机床需用台时Ｈａ的比值称为加工复杂系数：Ｃ＝Ｈｂ／Ｈａ。工件的复杂程度和精度越高，Ｃ值越...  
          
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        发布时间：2021-03-12
      • Ma Shichun
        Issue 4, (1998) DOI: 10.19455/j.mcgy.1998.04.012
        摘要：Oak (Quercus mongolica)and spinybract evergreen chinkaping (Castanopsis hystrix)boards were dried with high temperature and conventional technology.The comparison results showed that new technology could not only reduce drying time but improve drying quality as well .  
        关键词：Drying technology;Hardwoods drying   
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        发布时间：2021-03-12
      • Wu Shuhong Luo Zhaohui Sun Zhenyuan
        Issue 4, (1998) DOI: 10.19455/j.mcgy.1998.04.002
        摘要：3 kinds of melamine formaldehyde (MF) resin synthesized in laboratary and separated naturally in both aqueous and precipitate phases during storage were analyzed by C13 NMR,aiming at understanding effect of different structural groups of MF resin and caprolactam on storage stability.Results showed that storage life of the MF resins could be changed with substitute degree of amine group of melamine.The MF resins with structure such as NH—CH2—OCH2OH and NH—CH2OCH2—NH would be more stable in aqueous phase than NH—CH2—NH.The dissolubility of the MF resins with structure such as NH—CH2—NH in aqueous phase was improved due to additional caprolactam.But it is not sure that cocondensation of caprolactam with the MF resins was occurred during synthesizing.  
        关键词：Melamine formaldehyde resin;Storage stability;C13 NMR   
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        发布时间：2021-03-12
      • Zhao Linwu Wang Chunpeng Liu Yi Wang Jing Jin Liwei
        Issue 4, (1998) DOI: 10.19455/j.mcgy.1998.04.003
        摘要：Fastcuring PF resins with low toxicity and fast curing were prepared by using complex catalytic agent and advanced technology.Study results showed that hot pressing temperature and time of the PF resins with 5%～10% curing agent were similar to those of commonly used UF resins.  
        关键词：PF resin;curing agent;Fast cruing   
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        发布时间：2021-03-12
      • Issue 4, (1998)
        摘要：美国阔叶木：为您的产品增值提供机遇———记美国阔叶木外销委员会（ＡＨＥＣ）第三届东南亚区年会１９９８年６月３日～４日，美国阔叶木外销委员会东南亚区第三届年会在上海隆重召开，２００多名来自美国、中国大陆和香港及东南亚国家的业内代表出席了为期２天的大会。...  
          
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        发布时间：2021-03-12
      • Ruan Weizhi Shi Zhiping
        Issue 4, (1998) DOI: 10.19455/j.mcgy.1998.04.007
        摘要：In this paper,financial sensitive factors of total investments internal rate of return(IRR) for woodbased panel enterprises were analysed.The result showed that important ways to improve economic benefit of the enterprises was to meet the needs of market,to restrucure products,to upgrade product quality,to ensure product market share,to improve business management,to adopt new technology,to reduce consumption of raw material and to reduce operation cost.  
        关键词：Woodbased panel;Economic benefit;Financial sensitivity analysis   
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        发布时间：2021-03-12
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