最新刊期
      期 0 ， 2020
      • Tang Yizhuang Yuan Yisheng
        Issue 2, Pages: 1-6(1990) DOI: 10.19455/j.mcgy.1990.02.001
        摘要：This paper deals with 3 methods for bamboo preservation treatments and 7 preservatives applied on green or air dried bamboo (Phyllostachys pubescens and Ph. meyeri). The air-dried bamboo was treated with soaking and hot and cold bath process, and the green ones with stepping processIn order to find out absorption rate and depth of preservatives in bamboo, a series of tests have been carried out. The absorption of preservative is rela ted to the height of bamboo, moisture content and harvest seasons. In addition, some tess ori treated bamboo against to mould and stain as well as the measure ment of its mechanical properties have also been. done. Its decay resistance in field test will be continued  
        关键词：Hot and cold bath process;Soaking;Stepping process;preservative   
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        发布时间：2021-03-12
      • Sun Zhenyuan Wu Shuhong
        Issue 2, Pages: 7-12(1990) DOI: 10.19455/j.mcgy.1990.02.002
        摘要：Based on literatures and test results in our lab., some design principles of a UF adhesive arepresented in this paper as follows: 1) The end F/U mole ratio of the UF resin has to be 1.40-1.20: 1.0 for good bonding strength of panels bonded with resins; 2)In order to decrease the release level of formaldehyde from wood-based panels below 10mg/100g (perforator method), the free urea in the resin should be more than 10.0% of all urea used; 3) The cycle compounds of urea, such as Uron and triazine, are introduced into molecules of the UF resin, it is preferable that the cyclecompounds are about 10% of all urea added There are 3 UF resins cooked according to the principles for particleboard and MDF uses, all the formaldehyde release levels are less than 10mg/100g, and the physical and mechanical properties are better than those of Chinese national and enterprise standards  
        关键词：Urea-formaldehyde resin with low odor;Cycle derivatives of urea-formaldehyde;particleboard;MDF   
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      • L. Mehlhorn,V. Thole
        Issue 2, Pages: 13-19(1990) DOI: 10.19455/j.mcgy.1990.02.003
        摘要：In connection with a bilateral project sponsored by BMFT "utilization of lignocellulose for the manufacture of board-type materials" between the Fraunborer-Institute for Wood Research (WKI) and the Chinese Research Institute for Wood Industry (CRIWI), WKI took over amongst others the task to project a plant for the manufacture of gypsum-bonded particleboards according to the semi-dry process Basis on the assessment of the requirements of the raw material has been an extensive investigation on Chinese raw materials which has been carried out by a visiting scientist from the People’s Republic of China during his activities in the WKI The required capacities have been calculated based on the project data. The entire production plant can be divided into the following categories heat production, binder calcination and board manufacture. In accordance with the related basic operations are described the technology and the projected plant technique including the required measures for the quality assurance.  
        关键词：Populus davidiana;Gypsum;Gypsum-bonded particleboard   
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        发布时间：2021-03-12
      • Zeng Qiyun Bao Xianfong
        Issue 2, Pages: 20-23(1990) DOI: 10.19455/j.mcgy.1990.02.004
        摘要：To give evidence of modifing the state standard "GB 1931-80 method for determination of moisture Content of wood", in this paper the comparisons of determination for moisture conteht of 5 wood species, such as Pings rnassoniana, which contain higher gum resin and volatile constituents, have been-made with oven drying, vacuum drying and destructive distillation, The results show that the oven dryiag method is simply and practical, but the determined moisture content values is higher than the others If the samples contain higher volatile constituents, the error of moisture content determined by the oven drying method is larger, vacuum drying method can be used  
        关键词：moisture content;Moisture content determination;Oven drying method;Vacuum drying method;Distillation method   
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        发布时间：2021-03-12
      • Ma Yah Zhang Ning
        Issue 2, Pages: 24-27(1990) DOI: 10.19455/j.mcgy.1990.02.005
        摘要：The mathematics model of the analytic results of volumes on unedged board, wane board and flat square log etc. was deduced from an ellipse-parabola cylinder model From this result, a more precise mathematics pattern for CAD and CAM as well as the optimum cutting design can be provided  
        关键词：Ellipse-parabola cylinder;The flat square log   
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      • Issue 2, Pages: 28-31(1990) DOI: 10.19455/j.mcgy.1990.02.006
        摘要：<正> 一、前言八十年代初期,国家物资部门,购入了九条年产1.5万立方米刨花板生产线。兴建在杭州、郑州、昆明、济南、武汉、西安、太原、南昌、合肥九个城市的物资部门木材加工厂内。但是将近十个年头过去了,这些设备生产仍然不正常,各厂也进行了  
          
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      • Issue 2, Pages: 31-34(1990) DOI: 10.19455/j.mcgy.1990.02.007
        摘要：<正> 气固两相经弯管处的流动历来是气力输送中的研究课题,木材工业的气力输送也是如此。但对弯管流动的很多探讨研究都没有涉及到紧接弯管后面的加速管段。关于加速段的研究也是现今国际上对之探讨的课题,但理论上的论述往往与实际应用中的情形并非一致。在气力输送系统中,弯管和加速段的压损很大,一般说要比其它形式的压损大得多。本文就国外有关研究情况,结合木材加工中气力输送的应用,对加速段和弯管的流动现象进行探讨,从而进一步阐明了木材加工气力输送系统设计  
          
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        发布时间：2021-03-12
      • Issue 2, Pages: 40(1990) DOI: 10.19455/j.mcgy.1990.02.008
        摘要：<正> △一个名为“1990年低质阔叶树材的加工与利用及林产品国际贸易”的国际会议将于6月10～13日在台湾国立大学召开。本次大会是由台湾国立大学林业研究院发起,美国奥本大学林学院主办,其他共同发起单位还有美国农业部林务局和林业研究组织的国际协会。  
          
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      • Issue 2, Pages: 41-45(1990) DOI: 10.19455/j.mcgy.1990.02.009
        摘要：<正> 前言木材干燥要耗用大量能源,从原木到产品,干燥耗能约占加工总耗能的40～70%。常规窑干1万立方米厚度为5厘米的红松板材,正常耗能折合标准煤571吨,但生产中的非正常的热损失有时则超出上述数字1倍。据估计,全国每年需干燥的木材约为三千万立方米左右。由此可见,研究木材干燥节能技术和开发干燥新能源,对于节约能源,降低  
          
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      • Issue 2, Pages: 46-47(1990) DOI: 10.19455/j.mcgy.1990.02.010
        摘要：<正> 前言为充分合理利用木质原料的原有特性,人们设想在不打乱原来木质纤维排列方向、保留木材基本性能的前提下,设计和开发出一种类似天然木材的产品—重组木。就是将枝桠材、小径材解离成通长的、相互交联并保持原有纤维排列方向和特性的疏松网状木纤维束,然后经干燥、施胶、组坯成型、  
          
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      • Issue 2, Pages: 48-49(1990) DOI: 10.19455/j.mcgy.1990.02.011
        摘要：<正> 胶合板、刨花板、中密度纤维板和其它人造板最常用的胶粘剂为氨基甲醛及三聚氰胺树脂。然而,这些树脂含有过量的游离甲醛,用它们压制的人造板会释放出游离甲醛。出于对环境保护的考虑,许多国家在使用人造板时对甲醛释放量作出了规定(表1)。  
          
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      • Issue 2, Pages: 49(1990) DOI: 10.19455/j.mcgy.1990.02.012
        摘要：<正> 经组织化学和选择性萃取法对云实科某些树种附物纹孔的研究表明:附物主要是由羧化多糖类组成。这一结论推翻了附物由木素和纤维素组成的传统观点。前人对附物作了许多研究,他们主要认为附物是沉积于原生质层与细胞壁之间的活性原生质体的衍生物。关于附物究竟是细胞壁的组成部分还是细  
          
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      • Issue 2, Pages: 50(1990) DOI: 10.19455/j.mcgy.1990.02.013
        摘要：<正> 根据苏联官方1989年10月向欧洲木材委员会提出的研究报告:森林面积(8.1亿公顷)占世界21.9%,蓄积量(859亿立方米)占25%以上。林产品占工业总产值4.5%。劳动力占工业的7%。1987年林产品产量为:原木38920万立方米(包括薪材),锯材10250万立方米,胶合板230万  
          
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      • Issue 2, Pages: 51-55(1990)
        摘要：<正> 布达拉宫维修工程全面展开—我东方公司承担木结构防虫、防腐工程布达拉宫始建于公元七世纪,历史悠久。这座宫殿是木结构建筑,共有堂、厅9000多间,面积达13万平方米,是西藏高原上的一颗明珠。但是多年来,布达拉宫的木结构遍受虫蛀、鼠啃,腐朽之害十分严重,已成为一座危宫。中央对维修布达拉宫  
          
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