最新刊期
      期 0 ， 2020
      • Wang Kai
        Issue 1, Pages: 1-7(1988) DOI: 10.19455/j.mcgy.1988.01.001
        摘要：A general review of the present poplar fast growing forest in the world has been mentioned. Mainly, on the subject of the characteristics of processing and utilization of the poplar are briefly and systematic described.  
          
        4
        |
        50
        |
        5
        <HTML>
        <L-PDF>
        <引用本文> <批量引用> 7130062 false
        发布时间：2021-03-12
      • He Dinghua
        Issue 1, Pages: 7-14(1988) DOI: 10.19455/j.mcgy.1988.01.002
        摘要：Paulownia elongata veneers were dried in a laboratory jet dryer at different temperatures (100 to 250℃, 4 steps) and jet velocities (5 to 20 m/s, 4 steps). The empirical equations of drying rate and the drying rate coefficent for veneer of 1, 2 mm thickness were obtainded.The production capabilities of dryer and drying costs at different temperatures and jet vilocities were predicted with the equations obtainded. The results indicate that the production capability of dryer could be increased and the drying cost reduced, with higher temperature, and the production capability is also increased with higher velocity. However the drying cost would be increased if the velocity is too high or too low. The optimum jet velocity could be determined with equations obtained and the actual level of cost eonpoments at the factory. An approach for the prevention of Paulownia veneer from discoloration was proposed.  
          
        3
        |
        37
        |
        0
        <HTML>
        <L-PDF>
        <引用本文> <批量引用> 7130121 false
        发布时间：2021-03-12
      • Liu Yaolin and Li Rongjun
        Issue 1, Pages: 14-21(1988) DOI: 10.19455/j.mcgy.1988.01.003
        摘要：The key to the automation of a kiln is how to determine the moisture contents (MCs) of sample boards inside a stack. This paper describes a new, microcomputerized wood dry kiln control system using special load cell’s for measureing the weights of sample boards inside the stack. The computer controls the dry bulb and wet bulb temperatures of a kiln based on the MCs calculated from the data of weights obtaind. Smooth schedules using MCs as the independent variables are recommended, however, if it is necessary, other kind of schedules can also be used. This system is easy to use, for there is English or Chinese prompt on the screen of CRT. There are four curves on the upper part of the CRT, they are the average MC of the sample boards, dry bulb and wet bulb temperatures, the depressions of dry bulb temperatures. On the lower part of the CRT, one can see the current values of time, MCs, temperatures, schedule, and the status of the valves and relays of the kiln. The data and curves mentioned above, as well as the current weights of sample boards can be logged with a dot-matrix printer.  
          
        11
        |
        13
        |
        4
        <HTML>
        <L-PDF>
        <引用本文> <批量引用> 7130110 false
        发布时间：2021-03-12
      • Teng Tongling,Tang Yifu,Wang Huaijun
        Issue 1, Pages: 22-29(1988) DOI: 10.19455/j.mcgy.1988.01.004
        摘要：The Continuous-Transition Kiln Schedules (CTKS) used in microcomputer control were developed. A series of trials were designed to dry various thickness lumber of Abies sp., Tsuga sp. and Quercus mongolica. Test results showed: by using microcomputer control system, CTKS are significantly effective in reducing the drying period and energy consumption without and additional degradetion as compared with the conventional schedules. The drying time and energy consumption for CTKS respectively were 16 percent and 18 percent less than that for the conventional schedules.  
          
        8
        |
        12
        |
        2
        <HTML>
        <L-PDF>
        <引用本文> <批量引用> 7130079 false
        发布时间：2021-03-12
      • Wang Haubin
        Issue 1, Pages: 29-36(1988) DOI: 10.19455/j.mcgy.1988.01.005
        摘要：This paper deals with some problems of an aerostatic guide for saw-blade, such as the characteristic of velocity distribution of air flow between the guide block and saw blade, the calculation methods for the mass flux of compressible air flow and the conditions of continuous and steady air flow etc. The results of analysis prove that the vibration damping and stabilized guidance of saw-blade can be realized by using the aerostatic guide, which can improve stability of band saw-blade.  
          
        5
        |
        20
        |
        1
        <HTML>
        <L-PDF>
        <引用本文> <批量引用> 7130166 false
        发布时间：2021-03-12
      • Chen shiying
        Issue 1, Pages: 36-44(1988) DOI: 10.19455/j.mcgy.1988.01.006
        摘要：Gypsum flakeboard is a gypsum board with reinforcement by wood flake. It has a higher MOR and MOE, good fire resistance and incombustibility. The product can be sanded, sawed, nailed, screwed, and it can be finished with wallpaper, decorative paper and foil, or veneer. Gypsum flakeboard is an ideal building material.  
          
        5
        |
        61
        |
        4
        <HTML>
        <L-PDF>
        <引用本文> <批量引用> 7130085 false
        发布时间：2021-03-12
      • Issue 1, Pages: 44-48(1988) DOI: 10.19455/j.mcgy.1988.01.007
        摘要：<正> 引言众所周知,世界胶合板和成材产品用材的供给量正在不断下降。而世界人口已从1980年的40亿增加到1987年的50亿。为满足社会对林产品的需求,林产品工业的生产效率必须提高,不仅要改进设备,还要有效地利用原料,包括过去较少利用或尚  
          
        5
        |
        23
        |
        1
        <HTML>
        <L-PDF>
        <引用本文> <批量引用> 7130101 false
        发布时间：2021-03-12
      • Issue 1, Pages: 48-50(1988) DOI: 10.19455/j.mcgy.1988.01.008
        摘要：<正> 保护森林,发展森林,现在已成为全世界的呼声。森林的生态环境价值,保存繁衍生物物种的价值,以及游憩价值等等,是难以用货币估量的。大家都承认,森林的社会效益远远超过了物质生产效益。亚马孙河流域  
          
        6
        |
        19
        |
        0
        <HTML>
        <L-PDF>
        <引用本文> <批量引用> 7130106 false
        发布时间：2021-03-12
      • Issue 1, Pages: 50-52(1988)
        摘要：<正> 中国林学会木材工业学会和杨树委员会于1987年9月11日至15日在北京联合召开了这次讨论会,来自林业、轻工、物资、建材、铁道等系统的科研、院校、设计、生产、管理等方面专家、教授和科技工作者88人参加了会议。会议由木材工业学会王恺理事长致开幕词,国家经委汤淑霞副局长到会讲话,  
          
        2
        |
        8
        |
        0
        <HTML>
        <L-PDF>
        <引用本文> <批量引用> 7130119 false
        发布时间：2021-03-12
      0