最新刊期
      期 0 ， 2020
      • Lu Xiaoning Zhang Yang Hong Zhongli
        Issue 3, Pages: 1-6(1991) DOI: 10.19455/j.mcgy.1991.03.001
        摘要：The purpose of this paper is to study the technology for manufacturing wood-cement particleboard by hot-pressing. After studing the technologi cal variables concerned, such as temperature and time of hot-pressing, water/cement ratio, cement/wood ratio, additive and board density, a series of multivariables regression equations were built up. In addition. some factory such as particle geometries were also discussed. The results showed that the hot-pressing temperature and particle geometries have a great effect on the properties of board; as compared to cold pressing, the hot-pressing process can make the hydration of cement faster, the initial strength of board higher and the curing time of board shorter It is summed up that the hot-pressing method can simplify the wood-cement particleboard manufacturing process without any loss in physical and mechanical properties of the board.  
        关键词：hot-pressing;Wood-cement particleboard   
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        发布时间：2021-03-12
      • Wang Siqun Hua Yukun Dong Shiqin
        Issue 3, Pages: 6-10(1991) DOI: 10.19455/j.mcgy.1991.03.002
        摘要：The purpose of this paper is to study the strength properties of the composite oriented strand board made from bamboo and Italian fast-growing poplar, and the effect of resin type, strand thickness, ratio of bamboo strand, board density, mat structure, resin content etc on the composite OSB was analyzed.The results showed: (1) there is no significant effect of resin type on the strength of the board; (2) both increasing the board density and reducing the strand thickness can increase the strength of the board; (3) single layer OSB has the highest strength; (4) raising the ratio of bamboo strand can improve the strength of the OSB board, but too high ratio of the bamboo strand is disadvantagous for the ratio of MOR to board density and of MOE to board density; (5) the strength of the board made with PF resin can drop as the acidity increase of the furnish.  
        关键词：Bamboo;Italian fast-growing popla;OSB;strength   
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        发布时间：2021-03-12
      • Wang Zheng
        Issue 3, Pages: 11-14(1991) DOI: 10.19455/j.mcgy.1991.03.003
        摘要：In acidic condition, the extractive form waste water in hardboard production reacts with extra amount of formaldehyde at 1-5∶1 (formaldehyde : solid extractive, based on weight) to prepare extractive-formaldehydecomplex, then urea or phenol is added into the solution of this complex and reacts with unreacted formaldehyde to form a new adhesive system.* This adhesive system can be used in making wood-based panels and more than 20% production cost savings can be made without any harmful to the properties of panels.  
          
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        发布时间：2021-03-12
      • Zhou Xiongzhi Liu Zhengtian
        Issue 3, Pages: 15-20(1991) DOI: 10.19455/j.mcgy.1991.03.004
        摘要：Thermal analysis (included TG, DTG, and DSC) of untreated and treated wood was carried out to study the influence of fire retardants on the pyrolysis The results of TG and DTG showed that the temperature range and the rate of weight losses of wood in the stage of severe thermal degradation were changed, and the weight of remains at temperature of 400℃ was obviously increased when fire retardants were added. In temperature range of 20-450℃, in the DSC curve of untreated wood appeared three peaks cortesponding to the three stages of pyrolysis. The position and shape of DSC curws were essentially changed, by treating with fire retardants, that is, the combustion properties of wood were changed. Based on results, a primary explanation is offered on the mechanism of fire retardancy.  
        关键词：Thermogravimetric analysis;Differential thermogravimetric analysis;differential scanning calorimetry;Pyrolysis;combustion;Fire retardancy;Fire retardants   
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        发布时间：2021-03-12
      • Zhou Ming Liu Xiuying Fu Yan
        Issue 3, Pages: 21-24(1991) DOI: 10.19455/j.mcgy.1991.03.005
        摘要：The sand-block method was adopted for testing the toxicity of 15 water-borne and 3 oil solvent preservatives against wood decaying fungi. The results of the toxicity of 18 formulated preservatives against Coriolus verszcolor, Poria placenta and Coniophora puteana are summarized as follows:* 1. the toxicity of preservatives CCA3, CCA4, CCA5, CCB1, CCB3, CCB5, BBF, FBP, whose threshold retentionis 3.4-5.0 kg/m3, is higher than that of any other water borne ones.* 2. the toxicity of preservative P-B with a 0.7-1.8 kg/m3 is the highest in 3 oil solvent preservatives.* 3. the leaching toxicity of CCA appears much higher than that of CCB, BBF, and FBA.  
        关键词：Wood decaying fungi;Preservative;Test of toxicity;Test of leachability   
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        发布时间：2021-03-12
      • Ji Chengcao Yuan Yisheng
        Issue 3, Pages: 25-28(1991) DOI: 10.19455/j.mcgy.1991.03.006
        摘要：sixteen preservatives were tested for their effects in protecting timber against termites with wood stakes in the field, Nanping, Fujian province, according to the timber degree damaged by termites and fungi. Results showed that CCA (B) , OP-2 were effective, applicable for wood preservation outdoor Index of performances of CCA (B) at 5% a. i, 7.00kg/m~3 (dry salts retention) were 100 and 90 after 6 and 8 years′ tests respectively. FCCA and BBP were at 3-5% a. i, 5-7kg/m~3 (DSR), low cost, suitable for indoor uses.  
        关键词：Preservative;Field test;Termite;Fungus;Effect;Index of performance   
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        发布时间：2021-03-12
      • Zu Bosun Xu Lulu Zhou Qin
        Issue 3, Pages: 29-33(1991) DOI: 10.19455/j.mcgy.1991.03.007
        摘要：A wide variety of combinations of chemicals (including surfactants, oxidants, reductants, organic acids, ultraviolet absorbens, boron-containing compounds, alkali liquors. urea and water-soluble polymers) have been tested in the soaking experiments of paulownia wood to prevent the wood from colour changeduring storage. The efficiency of each combination was evaluated by visual observation after soaking. Four combinations of chemicals have been found out, which have some capability to reduce the tendency Of the wood changing colour. The effects of different drying conditions and moisture content of the wood on the colour change were also observed. The suitabilities of various methods for preventing discoloration of the wood were discussed.  
        关键词：Paulownia elogata;Discoloration   
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        发布时间：2021-03-12
      • Issue 3, Pages: 34-36(1991) DOI: 10.19455/j.mcgy.1991.03.008
        摘要：<正> 前言我国木材长期短缺,造成大量资源赤字,1985年达1亿立方米左右。作为木材加工头道工序的制材必须注重产品质量,但因历史上的各种原因造成锯材质量一直很差。在锯枓使用时,一般都要加大刨光余量,严重的还要改锯,因此每年全国要浪费木材数百万立方米。本文拟对此提出一些初步的改进设想。  
          
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        发布时间：2021-03-12
      • Issue 3, Pages: 37-40(1991) DOI: 10.19455/j.mcgy.1991.03.009
        摘要：<正> 我国东北各胶合板厂都以阔叶树材生产高档胶合板,是国内胶合板的主要生产和出口基地。但大部分骨干厂是在五十年代甚至更卓建设的,虽经多次设备更替和改造,但其效果和经济效益均不太明显。特别是1980—1983年的那次大改造,由于对改  
          
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      • Issue 3, Pages: 41-43(1991) DOI: 10.19455/j.mcgy.1991.03.010
        摘要：<正> 非大面积成片分布林木(以下简称“非成林林木”)是指在地面上不呈大面积连续分布、稀疏、难以形成一定规律的森林群落结构的林木,包括囚旁树、林粮间作、农田防护林、牧场防护林、围沙林、水保林、护路林、护岸林以及河滩、村旁、农  
          
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        发布时间：2021-03-12
      • Issue 3, Pages: 44-48(1991) DOI: 10.19455/j.mcgy.1991.03.011
        摘要：<正> 声发射(AE,Acoustic Emission的缩写)在材料科学方面的应用引起了广泛的重视,同样在木材工业的应用也已成为热门课题,例如:利用声发射评价材料优劣、探讨木质材料和胶层的破坏机理,识别木材破坏、胶合不良及缺陷材的无损检测,预测木材人工干燥中的开裂,从而控制干燥工  
          
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      • Issue 3, Pages: 49-51(1991) DOI: 10.19455/j.mcgy.1991.03.012
        摘要：<正> 在木材干燥领域内,常压不过是变压的特例;压力周期式往复变动不过是压力浮动的特例。长期以来,介质温度、相对湿度和气流速度构成“木材干燥三要素”。那末,对于构造及特性变异很大的众多树种木材的干燥,介质压力作用、控制的方式、带来的弊与利、学术意义尤其是生产实用价值  
          
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      • Issue 3, Pages: 52(1991) DOI: 10.19455/j.mcgy.1991.03.013
        摘要：<正> 高压装饰层压板用底层浸渍胶膜纸的传统生产工艺是将原纸在酚醛树脂溶液里浸渍,使树脂渗透到原纸内部,用挤胶辊控制上胶量,再在130℃～180℃的热空气循环下干燥。该工艺的最大缺点是有大量的溶剂和微小胶粒排放到空气中,污染空  
          
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      • Issue 3, Pages: 53-56(1991)
        摘要：<正> 新型阻燃刨花板通过部级鉴定由中国林科院木材工业研究所承担的林业部重点科研课题—阻燃刨花板生产技术,于1991年4月24曰在北京通过林业部主持的技术鉴定。鉴定委员会由林产工业、阻燃、公安消防、建筑、新型建筑材料等各方面的12位专家组成。  
          
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