最新刊期
      期 0 ， 2020
      • Zhang Guilin,Xu Yonglan,Liu feipeng
        Issue 3, Pages: 2-9(1990) DOI: 10.19455/j.mcgy.1990.03.001
        摘要：This paper deals with thoe self-bonding poplar wood dry-processing MDF and its bonding mechanisms of fibers treated with active agents, such as NaOH, HNO3 and H2O2. Through mathematical analysis of the experiment, the best results have been gained between the variable ranges of parameters.The optimization conditions are as follows: 1) The ratio of active agent absolute dried weight to the oven dried weight of fibers: 2% for using NaOH as activator. 2) The ratio of gap-filling material absolute dried weight to that of fibers. 10-12%. 3)Temperature of hotpress: 220℃. 4) Time of hot press: 18 min. 5) The moisture content of dried. fibers: 7-7.5%. The optimization strengths are as follows: MOR: 25（MPa）, IB: 0.46 （MPa）, MOE: 3680 （MPa）, LS: 0.72%, THS. 9.65%, MC: 3.96%, Density: 0.78g/era3.The bonding mechanisms,of MDF activated with NaOH are: 1) Theeompetition reaction between the degradation and condensation reaction of lignin and gap-filling materials. 2) Bonding between semicellulose and lignin （LCC）. 3) Hydrogen bond force and the combination of free radicals.  
        关键词：Self-bonding;Medium density fiberboard (MDF);Activator;Electronic spin resonance (ESR);Free radicals   
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        发布时间：2021-03-12
      • Issue 3, Pages: 9(1990) DOI: 10.19455/j.mcgy.1990.03.002
        摘要：<正> 密西西比林产品研究所研究了一种测定人造板透气性的方法。透气性是气体和蒸汽在人造板板坯中移动难易的量度,在热压过程中强烈的影响着传热和传质。了解了透气性如何随温度和压板压力的  
          
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        发布时间：2021-03-12
      • Wang Tianyou Li Qiang
        Issue 3, Pages: 10-13(1990) DOI: 10.19455/j.mcgy.1990.03.003
        摘要：The purpose of this experiment is to explore the feasibility of using tobacco stalk for production of hardboard by wet-process andfind out the technological parameters suitable 1or this kind of material The results showed that the tobacco stalk is an excellent raw material for hardboard manufacture.  
        关键词：Tobacco stalk;Hardboard   
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      • Issue 3, Pages: 13(1990) DOI: 10.19455/j.mcgy.1990.03.004
        摘要：<正> 无损检测方法用于预测每张整幅人造板的静曲强度和刚度。在人造板厂采用无损检测方法将强度较差的人造板鉴别出来,从而减少了人造板产品变异性,增加了使用这些板材的建筑的安全性。最  
          
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        发布时间：2021-03-12
      • Luo Wenshi et al
        Issue 3, Pages: 14-19(1990) DOI: 10.19455/j.mcgy.1990.03.005
        摘要：A resorcinol-phenol formaldehyde, resin was developed for bonding laminated wooden beamswhich have a large cross-section and used under a sever condition," This kind of resin, can be cured at room temperature. In order to determine its performance, some tests on interal, bond and weatherability were carried out and the properties of the resin were discussed, The results indicated that, the performance of the resin can meet designed.requirements. At present, the beams bonded with the resin have been used in practice  
        关键词：Resocinol-phenol formaldehyde resin;Laminated wooden beam   
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        发布时间：2021-03-12
      • Guang Meiyun et al.
        Issue 3, Pages: 20-24(1990) DOI: 10.19455/j.mcgy.1990.03.006
        摘要：Post-forming decorative sheet is a kind of paper-based high-pressure laminates.This study focuses on preparation of the resins9 selection of the papers, determination of parameters for sheet production and application of forming technique. At present, the pilot products whose minimium radius is up to 10 times of sheet thickniss have been used as consigning desks at Beijing International Airport.  
        关键词：Post-forming decorative sheet;Melamine resin;Phenol formaledhyde resin   
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        发布时间：2021-03-12
      • Issue 3, Pages: 24(1990) DOI: 10.19455/j.mcgy.1990.03.007
        摘要：<正> 用高含水率的原料制造木质复合材料是较理想的,因为这样可使板材出压机后的含水率与以后使用时的平衡含水率相适应,从而可提高板材的尺寸稳定性。但采用这种方法随之而来的问题是用胶的限制及由于高温高压而造成的“鼓泡”现象。  
          
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        发布时间：2021-03-12
      • Liu Xiuying,Zhou Ming,Lin Lulu
        Issue 3, Pages: 25-28(1990) DOI: 10.19455/j.mcgy.1990.03.008
        摘要：Choosing bamboos (Phllostachys henonis) treated with five agents as test materials, the experiments on decay resistance efficiency of the agents have been done. The results have been showed in the paper.Using hot and cold bath proces, the bamboos treated with the concentration of 5% f BBand concentration of 3% of BBF have better antidecay efficiencies. Using soaking methods, the bamboos treated with 5% of BP, CCB, FCAP have better efficiencies of antidecay. The soaking time is good for 19 days.The antidecay of natural bamboos (Phyllostachys pubescens) is worse than natural wood When having the 20% weight lossing rate, the bamboos have lost their worth of utilization. While at the same rate, using of wood is effected to some extent.  
        关键词：Bamboos;Wood decaying fungi;Preservative;Preservative effect   
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        发布时间：2021-03-12
      • Zhang Souhuai Zang Lihua Liu Hong
        Issue 3, Pages: 28-32(1990) DOI: 10.19455/j.mcgy.1990.03.009
        摘要：This study presents the effect of different manuring methods and seasons on physico-mechanical properties of biennial Phyllostachys pubescens. The results showed that there is difference between manuring and non-manuring, two manuring methods, manuring in autumn and spring, but the difference is not signifecant.  
        关键词：phyllostachys pubescens;Manuring method;Physico-mechanical properties   
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        发布时间：2021-03-12
      • Ruan Weizhi
        Issue 3, Pages: 33-37(1990) DOI: 10.19455/j.mcgy.1990.03.010
        摘要：The drum flaker is aft ideal machine for making flakes in particleboard production, and the drum is a keypart. In this article, the main types of drums and the structure characteristics of the hyperboloidal drum were introduced. The design parameters of hyperbololidal drum and its dead knife, the driving power, productive capacity as well as selection and calculation of some cutting parameters were studied. According to the examination results of Model BX444 drum flaker, the design calculation methods stated by the article were verified.  
        关键词：Flaker;Drum flaker   
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        发布时间：2021-03-12
      • Issue 3, Pages: 38-40(1990) DOI: 10.19455/j.mcgy.1990.03.011
        摘要：<正> 一、概况利用非木材类植物纤维为原料生产人造板,以代替部分木材,对缓解木材供需矛盾具有重要的战略意义。迄今为止,已被利用的非木材纤维生产板材者,计有稻草、稻壳、棉秆、麦秸、油菜秆、烟秆、玉米芯、甘蔗渣、麻秆、剑麻根、葵花秆、花  
          
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        发布时间：2021-03-12
      • Issue 3, Pages: 40-45(1990) DOI: 10.19455/j.mcgy.1990.03.012
        摘要：<正> 序言在许多国家由于刨花板生产急剧增长,木材的供应越来越紧缺。因此,如何以其它合适的原料取代木材作刨花板,具有日益重要的意义。在木材匮乏地区,可大量采用一年生作物的剩余物作代用品。  
          
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      • Issue 3, Pages: 46-50(1990) DOI: 10.19455/j.mcgy.1990.03.013
        摘要：<正> 木材构造研究史可分为两部分:1.木材解剖学研究史;2.木材超微构造研究史。一、木材解剖学研究史木材解剖学早期作为植物解剖学的一部分,迄今已有它自己的含义、专门描述方法和名词术语,成为林学家和木材工艺学家重要的研究领域。  
          
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      • Issue 3, Pages: 51-53(1990) DOI: 10.19455/j.mcgy.1990.03.014
        摘要：<正> 背景结构人造板常规热压工艺要求热压温度为177—210℃,木刨花含水率2-8%。这主要是根据所使用的酚醛和脲醛树脂的要求确定的,这两种树脂在高温和低木材含水率下才能良好固化。类似的热压工艺条件甚至也用于使用异氰酸酯胶粘剂的工  
          
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        发布时间：2021-03-12
      • Issue 3, Pages: 54-57(1990)
        摘要：<正> 中国林科院木材工业研究所集中了较强的木材干燥工艺、窑休设计、自控、机械没计制造等方面的人员研制成功了LK—1型微机木材干燥过程控制系统和CWD系列金属壳体的木材干燥窑成套设备。其中LK—1型微机木构干燥过程控制系统于  
          
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