最新刊期
      期 0 ， 2020
      • Zhu Yimin
        Issue 2, Pages: 2-5(1991) DOI: 10.19455/j.mcgy.1991.02.001
        摘要：The non-odor plywood bonded with JS-5 UFresin has good internal bond strengths; its formaldehyde emission is as low as 0.5mg/1; the physical and mechanical propelrties of the plywood can reach the Enterprise and National Standard.  
        关键词：Non-odor plywood;plywood;urea-formaldehyde resin   
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        发布时间：2021-03-12
      • Qian Dawei
        Issue 2, Pages: 6-13(1991) DOI: 10.19455/j.mcgy.1991.02.002
        摘要：In this paper, some factors affecting the strength of corner joint structure in particleboard furniture have been investigated. The results indicated that the strength of corner joints increased with the increase, of thickness, density, moisture content, MOR and IB of the board, and that the measure of coefficient of variability (COV) for MOR and IB of the board would play a more important role in the stability and strength of corner Structure in furniture. The strength of resistance of deflection in 1°of the corner structure jointed with butt-dowel and the rupture, strength of the corner structure jointed with screws and metalcassing-were higher than that of other types of joints. The test showed that the strength of corner structure under pressure and with detachable joints was lower than that with fixed joints. Therefore, the particleboard with low COV should be used in designing the corner structure of furniture and the joint structure under pulling load should be given a special attention.  
        关键词：Particleboar;furniture;Joints;Corner structure;Detachablejoint;Fixed joint   
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        发布时间：2021-03-12
      • Wang Sunguo Hua Yukun
        Issue 2, Pages: 14-18(1991) DOI: 10.19455/j.mcgy.1991.02.003
        摘要：It was a new field to manufacture reconsolidated bamboo with the processing principle of reconsolidated wood After the effect of resin content, pressing temperature and time on reconsolidated bamboo properties had been Studied, the way of resin application, the washing of bamboo strands, the kind of adhesives and the addition of water to liquid PF adhesive on the performance were further discussed, SEM and ESR were used in the study.* The results showed that the washing of bamboo strands treated with NaOH had a good effect; compared PF adhesive with alcohol-soluble PF, the former was applicable for the process of reconsolidated bamboo; the resin with much water not enly had a bad effect on its propreties, but also made the final products performance decrease and cost high and that the impregnating process of PF may make the adhesive spread on the strands uniformly, but it had no distinct influence on improving IB.  
          
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        发布时间：2021-03-12
      • Yu Dexin Fan Mizi
        Issue 2, Pages: 19-23(1991) DOI: 10.19455/j.mcgy.1991.02.004
        摘要：This paper describes application of press-drying process to Schi- ma superba, 25 mm thick lumber could be dried to 19% moisture content in 1～2 hours by this method. The results obtained from the test shows that there are significant effects of drying temperature on drying time and platen pressure on thickness loss; there is a relationship between the sawing pattern and internal check of dried lumber. Compared with the flat-sawn lumber, the quarter-sawed lumber has less internal check affer press-drying.* The press-drying method is suitable for any hardwood species, especially for some valuable species used for carving in the small-scale craft factory.  
        关键词：Press-drying;Schima superba;Drying defects   
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        发布时间：2021-03-12
      • Qin Tefu Lu Xixian
        Issue 2, Pages: 23-28(1991) DOI: 10.19455/j.mcgy.1991.02.005
        摘要：This study is aimed to explain the bonding function of sugar in wood-based particleboard by investigating the composition of sugar in particleboard in which molasses acts as a chemical additive and the converting condition of free sugar and its change in quantity during hot pressing. The results shows that the chemical activity of wood surface is incressed during hot pressing and some hemicellulose and cellulose are hydrolyzed into single sugars. The sugars and molasses can be converted into furaldehyde. The furaldehyde can bond with lignin actived under hot pressing to form resinoid. By infrared spectroscopy examination, after pressing, the chemical functional groups of wood slip surface have changed. There are an increase in hydrophobic carhonyl groups and a decrease in hydropliclic hydroxidon groups. These changes of groups can explain the reason that the particleboard bonded with molasses has good waterproof ability.  
        关键词：Molasses;particleboard   
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        发布时间：2021-03-12
      • Zhou Ming Liu Xiuying Fu Yan
        Issue 2, Pages: 29-32(1991) DOI: 10.19455/j.mcgy.1991.02.006
        摘要：The natural decay resistance of Chinese white poplar (Populus tomentosa) and Masson′s pine (Pinus massoniana) woods against white rot fungi (Coriolus versicolor, Lentinus lepideus) and brown rot fungi (Poria placenta, Lenzites trabea) attack was evaluated with 3 kinds of culture mediums in laboratory.* The fungi, C. versicolor and p. placenta grew faster in sand-sawdust than in other mediums. Significant weight loss of wood caused by the fungi C. versicolor and P. placenta was found after 3 months exposure.  
        关键词：Test fungi;Decay procedure;Weight loss;Natural decay resitance   
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        发布时间：2021-03-12
      • Issue 2, Pages: 33-36(1991) DOI: 10.19455/j.mcgy.1991.02.007
        摘要：根据我国制材工业中较为普遍的锯机设备选择不当以及制材王艺和设备布置不协调的情况,结合目前原木和锯材的技术条件、生产规模和下锯方法,本文对带锯制材长、短工艺布置图作了分析和比较,并绘出典型布置图例。对主锯机的组成、各锯机之间的合理配置、锯材和剩余物的运输方式等作了较详细的阐述,可供新建或改建制材工艺设计作参考。  
        关键词：工艺布置图;主锯机;辅助锯机;开式定位;闭式定位   
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        发布时间：2021-03-12
      • Issue 2, Pages: 37-42(1991) DOI: 10.19455/j.mcgy.1991.02.008
        摘要：<正> 一、引言水泥刨花板是以木质刨花或纤维与水泥为主要原料制成的一种人造板。它兼有木材和水泥的双重性能,与普通的建筑材料相比,具有重量轻、强度大、安裝组合方便以及耐侯、耐潮湿、耐火、耐菌虫、绝缘和机械加工性能好等特点,是良好的工程  
          
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        发布时间：2021-03-12
      • Issue 2, Pages: 42(1991)
        摘要：<正> 木材性质的变异可使木材在加工过程中产生一系列问题,尤其是速生的人工林。围绕这一主题,美国中北部林业试验站的专家们开始了树龄和环境条件对木材性质影响的研究。初期工作主要是对针叶树材强度、加工性能受营林作业影响的研究,然后是评价营林作业对阔叶树材材质影响的研究,其中一个主要内容是造林作业对阔叶树材密度的影响,木材密度是木材加工的一个主要特性标志。  
          
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        发布时间：2021-03-12
      • Issue 2, Pages: 43-45(1991) DOI: 10.19455/j.mcgy.1991.02.009
        摘要：<正> 一、概况自1966年美国建成世界上第一个中密度纤维板(Medium Density Fibreboard,简称MDF)厂以来,据资料报道,至今世界上已建成MDF厂75个,年生产能力为685.115万m~3,正在建设中的厂18个,可形成约130万m~3的年生产能力(见附表)  
          
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        发布时间：2021-03-12
      • Issue 2, Pages: 45-46(1991) DOI: 10.19455/j.mcgy.1991.02.010
        摘要：<正> 一、前言木材切片是观察木材内部微观结构的必由程序,要做好一张研究用的永久性切片,试验材料的软化是其中的一项重要工序。随着木材工业原料结构的变化和科研工作的深入,需要扩大对阔叶树材和进口木材研究,其中很多是硬重木材。因此有必要对这些硬重木材的软化  
          
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        发布时间：2021-03-12
      • Issue 2, Pages: 47-48(1991) DOI: 10.19455/j.mcgy.1991.02.011
        摘要：<正> 在造纸、人造板、制材以及坑木等生产中需对原料(原木、枝丫、原条等)进行剥皮,以提高产品质量,减轻刀具的磨损,提高生产效益。剥皮方式可分为手工剥皮、切削式剥皮、摩擦剥皮、高压水喷射剥皮、气力剥皮、化学剥皮及超高频剥皮  
          
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        发布时间：2021-03-12
      • Issue 2, Pages: 49-52(1991)
        摘要：<正> 积极开发和推广木材防腐技术木材防腐(包括防虫、防裂等)可延长其使用年限3—5倍,节约木材效果显著,而且处理设施简单、投资少,能在短期内显示它的经济效益。仅以木质海洋渔船和建筑用材为例,现在全国有木质海洋渔船约30万艘(包括养殖渔船),每年新造近  
          
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        发布时间：2021-03-12
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