最新刊期
      期 0 ， 2020
      • Zhou Guanghua et al.
        Issue 2, Pages: 1-7(1989) DOI: 10.19455/j.mcgy.1989.02.001
        摘要：Fired-logs suffered seriously from insects and fungi had got a good protection by fumigation with sulphuryl fluoride （SO2F2） and spraying with emulsion of Lindane and "6781" wood preservative during July to September in 1988 at Changying Log Yard, Amur Bureau of Forestry, Daxinganling, Heilongjiang province. The retention was 70 grams/m3 for fumigant of sulphuryl fluoride, 0.10—0315 kg/m3 for Lindane and 0.70kg/m3 for "6781" wood preservative. The mortality of the larvae of longhorn beetles Was 100% for the fumigant and over 95% for Lindane, "6781" wood preservative had an obvious effect on mould and blue stain.  
          
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        发布时间：2021-03-12
      • He Dinghua Lin Wenjie
        Issue 2, Pages: 8-13(1989) DOI: 10.19455/j.mcgy.1989.02.002
        摘要：Experiments of air drying and kiln drying on the board of 2.5 cm in thickness were made. Results obtained shown that the lumber of Gmelina arborea dries readily but some tendency to twist, While the lumber of Mytilaria laosensis tends to twist, surface checking, honeycomb and collapse in drying.The techniques in combining kiln drying with air drying were proposed.  
          
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        发布时间：2021-03-12
      • Huong Zhenghong et al.
        Issue 2, Pages: 14-20(1989) DOI: 10.19455/j.mcgy.1989.02.003
        摘要：The purpose of the study is to determine the performance of 2 fastgrowing hardwoods (Gmelina arborea and Mytilaria laosensis). In this study, the two species were used to manufacture sliced and peeled veneer, plywood with Masson’s pine for the core ply, and the sliced veneer was used as decorate material faced on plywood, MDF and particleboard. The results showed that the mechanical properties of the plywood and the veneer faced panels can reach the relevant Product Standards.  
          
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        发布时间：2021-03-12
      • Zhang Yi
        Issue 2, Pages: 20-25(1989) DOI: 10.19455/j.mcgy.1989.02.004
        摘要：In this article, the relationship between density, wood-gypsum ratio, water-gypsum ratio and properties of gypsum-bonded particleboard was studied, The results obtained as follows: 1. the strength of gypsum-bonded particleboard becomes evidently higher with the increase of density; 2. raising wood-gypsum ratio results in increase of MOR etc., but has no influence on MOE and internal bonding strength; 3. water-gypsum ratio plays no role on properties of board in the range of 0.30-0.40; 4. the three factors mentioned above have no interaction.  
          
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        发布时间：2021-03-12
      • Issue 2, Pages: 25(1989) DOI: 10.19455/j.mcgy.1989.02.005
        摘要：<正> 近来,美国胶合板工业在提高产量和降低成本方面取得很大的进展。通过改进旋切装置,使原木的出板率大大提高。随着旋切工艺的不断改进,干燥工序越来越成为整个生产中的一个薄弱环节。解决这一问题的一种途径是采用高湿胶合技术。下面介绍几种可用于提高高湿胶合技术的方法。1.高固体含量:这种方法基于这样一个概念,即采用高固含量的普通酚醛树脂胶,使其中减少的  
          
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        发布时间：2021-03-12
      • Liu Xixian Qin Tefu
        Issue 2, Pages: 26-33(1989) DOI: 10.19455/j.mcgy.1989.02.006
        摘要：This paper gives a description on the oxidation-degradation of lignin and the preparation of holocellulose from plant material by the sodium chloride method with different reaction time and temperature. It presents the data and figures to illustrate the relationship between holocellulose and acid-insoluble lignin, and explains the total residual lignin as the sum of acid-insoluble lignin (Klason lignin) and the acid-soluble lignin in holocellulose. The results are. 1. the holocellulose content is linear with the total residual lignin; 2. under the condition of same content of total acid-insoluble lignin in the plant material, holocellulose gained at room tempereture condition has a higher yield than that at 75℃; 3. since the acid-soluble lignin content is 50% of the total residual lignin it is necessany to determine the contents both acid-soluble lignin and acid-insoluble lignin so as to correct the content value of the holocelluse.  
          
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        发布时间：2021-03-12
      • Chen Sen
        Issue 2, Pages: 34-37(1989) DOI: 10.19455/j.mcgy.1989.02.007
        摘要：This report presents the results of the experiments on the influence of high-frequency and wood structure to the dielectric properties of Paulownia wood.The results show that the effect of frequency on loss tanδ is big, but small on dielectric constant and resistance; the effect of wood density on dielectric properties is small, It is Suggested that good heating effect with low energy comsumption can be obtained by using the frequency at max./min. loss tanδ.  
          
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        发布时间：2021-03-12
      • Issue 2, Pages: 38-44(1989) DOI: 10.19455/j.mcgy.1989.02.008
        摘要：<正> (二) 纤维板1.软质纤维板软质纤维板工业起始于1914年。产品主要作望板,吸音板,屋顶隔板,天花板等。由于市场上受到矿棉板、发泡塑料板、钙塑板等产品的冲击,在价格、产品的耐火性、比重、吸音性能等方面呈明显劣势,而且还存在用水量大、耗能较高、污水问题严重等缺点,似无太大的发展前途。目前国内  
          
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        发布时间：2021-03-12
      • Issue 2, Pages: 44-49(1989) DOI: 10.19455/j.mcgy.1989.02.009
        摘要：<正> 制材是木材加工中最基本的加工方法,加工量大,近年来各国都很重视通过采用先进技术改进制材工业,提高木材利用率。这方面最重要的进展是应用计算机技术。计算机在运算速度,存储容量,软件资源,工作可靠性等方面飞速发展,与此同时其体积与价格迅速降低,在各工业部门,其中包括  
          
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        发布时间：2021-03-12
      • Issue 2, Pages: 49-51(1989) DOI: 10.19455/j.mcgy.1989.02.010
        摘要：<正> 实践证明,刨花板成品要向周围环境释放出甲醛,苏联和许多国家都十分关注甲醛的毒性,所以相继规定了生产场地和生活住房空气中甲醛的允许极限浓度,苏联规定在生产场地工作区域空气中甲醛的极限允许浓度为0.5mg/m~3,而生活住房浓度为0.003mg/m~3。  
          
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        发布时间：2021-03-12
      • Issue 2, Pages: 52-54(1989) DOI: 10.19455/j.mcgy.1989.02.011
        摘要：<正> 前言杨树生长快,在适宜的生长条件下,一般年高度增长量达4米以上,直径增长量在4厘米以上。特别是I-69和I-72杨等优良品种,生长更快,五年生杨树直径可达30厘米,单株材积可达1立方米。采用集约经营,定向培育,高密度(株距1×1m,667株/亩)栽种的杨树林,两年亩产可达到4.5立  
          
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        发布时间：2021-03-12
      • Issue 2, Pages: 55-57(1989) DOI: 10.19455/j.mcgy.1989.02.012
        摘要：<正> “FWI-1”型誉写油墨是利用纤维板废水循环回用过程中的高浓度热压废水,再经超滤浓缩、纯化后得到的固体物质制造而成。开展该项研究的目的是通过综合利用途径解决纤维板废水对环境造成的危害,同时还将产生明显的经济效益。  
          
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        发布时间：2021-03-12
      • Issue 2, Pages: 57(1989)
        摘要：<正> 由捷克斯洛伐克的斯洛伐克工艺大学、国家林产品研究所、纸浆与造纸研究所、斯洛伐克科学院化学研究所、工业与经济发展研究所等五个单位组织的第15次国际纤维素会议将于1990年8月28—31日在布拉迪斯拉发召开。会议收题范围:  
          
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      • Issue 2, Pages: 58-59(1989) DOI: 10.19455/j.mcgy.1989.02.013
        摘要：<正> 一、前言中密度纤维板(简称MDF)是以木质纤维材料与胶粘剂压制而成的一种新型人造板材。由于它的组织结构均匀,密度适中,板面平滑易于装饰,加工性能优良,用途广泛,因而发展很快。目前全世界共有中密度纤维板厂48个,产量达443万立方米,而且仍在继续发展。中国林业科学研究院木材  
          
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        发布时间：2021-03-12
      • Issue 2, Pages: 60-61(1989) DOI: 10.19455/j.mcgy.1989.02.014
        摘要：<正> 过去我厂浅色装饰板曾出现色调不匀的现象,造成产品质量明显下降。对此我们进行了一些探索,现将探索所得简介如下: 装饰板表面色调不匀,是装饰板生产过程中极易产生的一种外观缺陷,其现象与透胶缺陷极为相似。但通过试验观察,两者确是有区别的。如只取浸渍三聚氰胺树脂的表层胶膜纸和装饰胶膜纸,而  
          
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        发布时间：2021-03-12
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