最新刊期
      期 0 ， 2020
      • Qiu Jinhui
        Issue 4, Pages: 1-5(1991) DOI: 10.19455/j.mcgy.1991.04.001
        摘要：In this paper, the principle of polarization and alignment motion of wooden particles were stated, and the relationship between average alignment angle and some factors concerned such as electrostatic field intensity(E), moisture content of particlc (MC), particle geometries (G), and hight of electrode plates (H) were revealed. The results obtained from the study showed:* 1. The free ions and polarized ions are primary factors causing wooedn particles to be polarized and aligned.*2. Field intensity and moisture content of particles have a significant effect on the particle alignment; the higher the field intensity were, the smaller the average alignment angle.*3. When the field intensity is over 4KV/cm, the average alignment angle rapidly worsen. The main cause for this phenomenon is point discharge in wooden particles.*4. About 19°alignment angle is obtained at 4KV/cm field intensity (E)  
        关键词：Average alignment angle;Particle alignment motion;Polarization;Field intensity   
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        发布时间：2021-03-12
      • Lei Deding
        Issue 4, Pages: 6-11(1991) DOI: 10.19455/j.mcgy.1991.04.002
        摘要：Thickness variation of particleboard is one of the urgent problems which needs to be solved in the wood-based panel industry of China. In this paper, the factors of thickness variation control in a typical particleboard plant are studied by means of statistical analysis. The results are given as follows: the level of thcikness variation control is much lower than advanced world level; the thickness variation affected by mixed species as raw materials accounts for about 55% of total square deviation, and the others are affected by forruing unit and hot press; the correlation of thickness with weight of the boards is significant, and the weight fluctuation of the mat in length and width doesn′t come up to the required standards. Further more, a recommendations on controlling the thickness variation of particleboard are put forward  
          
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      • Yu Dexin Song Yi Ran
        Issue 4, Pages: 12-16(1991) DOI: 10.19455/j.mcgy.1991.04.003
        摘要：This paper deals with the feasibility on the flakeboards made from smallwood and branches of rubber-wood(Hevea brasiliensis). The production technique for the flakeboards bonded with UF resin was optimized. The flakeboards and thin flakeboards bonded with PF resin also investigated. The results showed that the resin amounts and pressing time had a significant effect on the bending strength of the boards, the effect of resin amounts on the internal bonding Strength was considerable, the density of the flakeboards had a great effect on the thickness swelling. The properties of the flakeboards were superior to the particleboards.  
        关键词：Rubber wood;Flakeboard;UF resin;PF resin   
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      • Issue 4, Pages: 16(1991) DOI: 10.19455/j.mcgy.1991.04.004
        摘要：<正> 世界人造板产量由1975年的8,460万m~3增加到1989年的12,910万m~3,年增长率3.1%,其中亚洲为5.296%。刨花板产量达5,470万m~3,年增长4.2%。胶合板产量5,130万m~3,年增长2.9%。纤维板产量1,840万m~3,年增长1.6,其中亚洲为7.6%,而北美产量由1973年的最高峰下降了三分之一。人造  
          
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      • Li Jian Xu Xiuwen Lu Wenda
        Issue 4, Pages: 17-20(1991) DOI: 10.19455/j.mcgy.1991.04.005
        摘要：A treatment agent has been studied, which has a series advantages, such as: high efficiency, non-toxicity and non-pollution Meanwhile the optimum boiling processing of larch lumber for slicing microveneer has been studied by orthogonal experiments. By which the solubilization of resin from wood, relax the stress of wood and softening wood have been realized. Therefore the qualified larch sliced microveneer could be obtained.  
          
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        发布时间：2021-03-12
      • Zhang Houpei Quan Xianzhi Wang Ping
        Issue 4, Pages: 21-27(1991) DOI: 10.19455/j.mcgy.1991.04.006
        摘要：Through the comparing test, the results showed that the formulations of CCA3, CCA8, made up by authors, were similar to Tanalith C and Celcure K33 （the presertives of UK） in the effectiveness of resistance leaching and corrosion of metal: the arsenic content of them were lower than CCA-C, the presertive of USA: the CCA（s） made from Chineses chemicals （by-product copper arsenate） also had a good performances of anti-leaching and corrosion of metal, so they all can be used to treat wooden house structure in China. The immersion test indicated that the pressure treatment was more suitable for CCA serise. Another test showed that chromiun and copper in formulations of CCB can be fixed within wood well, the content of boron in wood can be maintained up to 60-70%, by treating the surface of wood with chemicals. In addition. the penta in the formulatio of PPA had good solubility in mineral oil, its "antiblooming" and paintability were also quite good.  
        关键词：Water-borne preservatives;Oil-borne preservatives;Resistance leaching;Anti-blooming   
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        发布时间：2021-03-12
      • Bao Fucheng Lǖ Jianxiong
        Issue 4, Pages: 28-32(1991) DOI: 10.19455/j.mcgy.1991.04.007
        摘要：The axial gas permeability of the air-dried heartwood of refractory spruce (Picea jezoensis var. Komarovii) was measured with rising-water volume-displacement method and the effect of benzene-ethanol extraction upon it was studied. The results indicated that the axial gas permeability, of the spruce air-dried heartwood is 0.02872 darcy and benzene-ethanol extraction pretreatment not only increases the permeability of it by 75%, but also improves its uniformity.  
        关键词：Picea jezoensis Var: Komarovii;permeability;Benzene-ethanol extraction   
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      • Lu Xixian Qin Tefu
        Issue 4, Pages: 33-37(1991) DOI: 10.19455/j.mcgy.1991.04.008
        摘要：The objective of this paper is to study the reaction mechanism of carbohydrate and its hydrolyste as a Chemical additive in wood-based particleboard 1. Through different thermal analysis and thermal degradation analsis, the experiment showed a good results by the variable ranges of pressing time and pressing temperature; 2. the boiling water resistance property of board can be raised by using carbohydrate as chemical additive and NH4NO3 or ZnCl2 as catalytic agent; 3. the examination showed that the board properties by adding NH4NO3 is better than ZnCl2.  
        关键词：Carbohydrate;particleboard;Thermal analysis;Chemical additive   
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      • Issue 4, Pages: 38-41(1991) DOI: 10.19455/j.mcgy.1991.04.009
        摘要：<正> 一、前言70年代中期起以结构木代替锯材建造房屋已被普遍地接受,如用小径木指接材替代锯材作龙骨,框架及梁柱等建筑构件、发展结构刨花板、单板层积材(LVL)、重组木、华夫板、复合板等。结构材的发展离不开胶粘剂,对于结构型胶粘剂的评价除了一般胶粘剂的指标外,耐久性是其关键指标,它与结构的使用寿命、强度、安全性紧密联系在一起,也是能否将结构材推广子建筑业的关键之  
          
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      • Issue 4, Pages: 42-46(1991) DOI: 10.19455/j.mcgy.1991.04.010
        摘要：<正> 一、引言我国制材企业工艺和设备落后,工艺布置不谐调,必须进行技术改造以提高锯材质量及企业的经济效益。在改造项目的设计中,应坚持“工艺从简、技术从新、土建从实、设备集中单一化”,这样既符合理论上的要求,也满足生产实际的需要。制材工艺设计是制材企业设计的专业内容之一,也是制材企业设计的核心部分。工艺设计合理与否将直接影响到加工任务量、锯材质量和经济效益。  
          
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      • Issue 4, Pages: 47-49(1991) DOI: 10.19455/j.mcgy.1991.04.011
        摘要：<正> 如今,刨花板已成为家具和建筑业最重要的人造材料。西欧刨花板行业的发展从1950—1980年,可以按下列时序来划分: 1.开创阶段(1950—1960),这一阶段的特征是刨花板从无到有。联邦德国1950年刨花板产量12,000立方米,到1960年末,产量已超过了100万立方米。2.扩展阶段(1960—1970) 在这一阶段刨花板行业迅猛发展,联邦德国刨花板产量平均每年以15%的速度递增,到1970年底,产量达到了380万立方米。  
          
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      • Issue 4, Pages: 50-51(1991) DOI: 10.19455/j.mcgy.1991.04.012
        摘要：<正> 由于木材资源日益减少,促使木材加工行业广开节木、代木途径。我国南方竹类资源丰富,已有多种竹材胶合板、竹编胶合板生产。由于这些产品大部分工序为手工操作,且表面质量亦不如木制板材,使其应用受到限制。1990年初,天津胶合板厂与中国包装科研测试中心合作进行了竹木复合胶合板的试制工作,并将试制品试用于包装箱生产,受到日木包裝业的关注。  
          
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      • Issue 4, Pages: 51(1991) DOI: 10.19455/j.mcgy.1991.04.013
        摘要：<正> 美国华盛顿州立大学John L. Wasnjewski先生进行了幼龄材对花旗松结构用板材影响的研究。该项研究的第一阶段为对次生海岸花旗松木材资源  
          
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      • Issue 4, Pages: 52-53(1991) DOI: 10.19455/j.mcgy.1991.04.014
        摘要：<正> 马尾松是福建传统的胶合板用材树种,由于马尾松的天然缺陷,致使马尾松胶合板主要用途只限于模板或包装板,而福建省每年要从国外进口大量胶合板作为家具及室内装修用材。福建柏(Eokienia hoclginsii)树干通直,结构细密、均匀,纹理直,材质轻软(气干密度为0.452g/cm~3)易干燥,是福建省重点发展的速生优质丰产造林树种之一。据不完全统计,六十年代初营造的十万亩福建柏即将进入成熟期和采伐期。为充分合理利用这一资源,笔者对福建柏制造胶合板进行了试验研究,旨在为福建胶合板工业开发新的原料来源。  
          
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      • Issue 4, Pages: 54-49(1991) DOI: 10.19455/j.mcgy.1991.04.015
        摘要：<正> 作为胶粘剂使用的脲醛树脂,其终点控制决定着产品的物理力学性能,准确地控制反应终点,就能制出好的产品来。而要准确地控制反应终点,首先要选择好的控制方法。本文将对脲醛树脂生产中通常使用的终点控制方法作一简单介绍,并就控制方法提一点个人认识供同行参考。  
          
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      • Issue 4, Pages: 55-58(1991)
        摘要：<正> 新型纤维模压门板通过鉴定夹板门是我国建筑业普遍采用的门种,按其面板材料的不同,主要分为胶合板夹板门和纤维板夹板门两种。由于胶合板生产成本高、原料来源曰趋紧张,使胶合板夹板门的发展受到限制;纤维板生产虽然成本低、原料来源广泛,但普通平面纤维板外观不够美观,使纤维板夹板门只能作为低档产品使用。即使经贴面、印刷或涂饰处理,装饰效果也不尽人意,而且增加成本,使工艺复杂、化。针  
          
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