Current Research and Development on Deformation and Fixation of Bended Wood and Wood-based Composites

There are many advantages of bended wood,such as good-looking shape,simple process and low cost.The product,however,is easy to get recovery,which is urgent to be dealt with.This paper concludes the features of deformation and recovery of bended wood and wood-based composites and summarizes four treating methods to keep dimensional stability.Compared to bended solid wood,some elementary perspectives on the research of bended wood-based composites are presented.The purpose of this paper is to suggest:1)to investigate the optimum heating time and temperature that bended wood and wood-based composites need from the formation of deformation to the recovery and to the permanent fixation,according to its changes of dimensional stability such as curvature radius;2)to measure the composites comprised of wood and adhesives on the changes of stress relaxation,dynamic viscoelasticity and crystal1ization field;3)to quantitatively analyze changes of the major components in wood cell wall polymers as well as the composites under heat/steam treatment and untreated conditions.It will be helpful for subsequent research to clarify on the mechanisms of permanent fixation of bended wood and also contribute to that of wood-based composites.     

木材及木质复合材料的弯曲变形与固定的研究进展

弯曲木具有造型美观、工艺简单、成本低廉等优点,但是产品易出现回弹变形的问题亟待解决。笔者归纳了木材及木质复合材料弯曲后的变形与回复,以及四种固定弯曲木变形的方法。并对木质复合材料弯曲和实木弯曲的特点作了对比,在研究木质复合材料弯曲的变形、回复及固定方面提出了初步的构想。     

国外木材和人造板数控加工装备技术研究进展

介绍了现代数控技术以及国外木材和人造板数控加工装备的主要技术成果,分析了国外木材和人造板数控加工装备的发展状况,总结了木材数控装备的共性关键技术,并提出了木质新材料对数控设备的发展要求。     

竹/木复合材料的研究现状与发展趋势

简要介绍了国内外竹/木复合材料研究和发展现状,对竹/木复合材料发展中存在的问题进行了探讨,简要分析了发展竹/木复合材料的经济效益和生态效益,提出竹/木复合材料今后的发展方向.     

4年生冰冻雪压毛竹弯压材的力学性能

毛竹(Phyllostachys edulis)是我国资源最丰富、利用范围最广、经济价值最大的优良竹种(江泽慧,2002),广泛分布于浙江、安徽、江西、湖南和福建等省区.由于该竹秆形高大、枝叶繁茂,一直以来是风雪灾害影响较大的林种之一(肖本权,2003).2008年1月份,我国南方遭受历史罕见的雨雪冰冻灾害,波及范围正好为毛竹的主分布区,毛竹林受灾极其严重.据报道,全国受灾竹林400万hm<'2>以上,其中80%为毛竹林(李潇晓,2008).     

我国木基静音地板发展现状分析

针对目前国内木基静音地板品种少、对天然优质软木依赖度大;基础理论研究少、无相应性能测试及质量评价标准的现状,提出从原料入手,加强木基地板静音机理的研究,开发新型的静音地板,制定相关的行业乃至国家标准等解决方案,同时,展望了木基静音地板的发展前景和趋势。     

木材密实化的研究进展

综述了木材密实化的国内外研究现状、应用领域,木材软化方法以及压缩变形的固定方法。对木材密实化技术存在的问题进行分析,展望了该项技术的研究方向和应用前景。

Abstract：

The wood densification-related research status at home and abroad,application field,wood softening methods and the fixation ways of compress deformation are summarized.Some problems with the wood densification technology are analyzed and the research orie     

木材湿热软化径向压缩变形特征研究进展

压缩变形特征是压缩木研究的重要内容。文中针对木材湿热软化径向压缩变形,从压缩变形的影响因素、压缩变形位置对其力学性能的影响和压缩变形固定3个方面综述国内外研究进展,包括树种、生长轮构造和压缩工艺对木材压缩变形的影响,压缩变形位置对力学性能的影响,以及热处理对压缩变形的影响,指出木材湿热软化径向压缩研究中关于压缩变形需要继续解决的主要问题以及发展方向,以期为湿热软化径向压缩木材的进一步研究和应用提供参考。     

薄刨花高密度人造板生产工艺初步研究

研究以厚度为10—200μm杨木刨花为原材料生产高密度人造板的工艺条件,探讨了热压温度、刨花施胶量、板材密度对产品性能的影响。结果表明,在热压温度155℃,板材密度为0．88g／cm^3,采用UF和MF混合添加,总施胶量为绝干刨花质量12％（其中MF占总施胶量的35％）的工艺条件下生产出的人造板具有良好的物理力学性能,各项指标达到或优于GB／T4897．3—2003,GB／T4897．4—2003刨花板国家标准的要求。     

多元羧酸类化合物对木材大压缩量变形的固定作用

以多元羧酸类化合物为酯化剂、以无机盐类为催化剂的交联体系是一类新型的水溶性、无毒害、无污染、木材交联反应未采用过的非甲醛系试剂交联体系。本文研究了这类非甲醛系试剂对木材大压缩量变形的固定作用,结果表明浓度９％的１,２,３,４丁烷基四羧酸处理大青杨试件,干状态的变形恢复率较低,沸水中变形恢复率接近于２７０１％。用１,２,３,４丁烷基四羧酸交联处理木材可以固定压缩变形,适宜的树脂浓度为９％。材色由偏红向偏黄方向转变。     

基于ANSYS的木质基复合材料的静力学分析

采用有限元软件ANSYS对木质基复合板进行静力分析,分析其在加载过程中的位移和应力等情况,得出材料的变形及受力规律,以便人们在板的制作过程中对其大应力及大位移区做特殊处理,保证在使用过程中不因结构的部分失效而影响整个结构的工作。本文中分别就不同铺层方向四层结构复合板以及相同铺层方向单、四层等厚度板分别建立模型,并在相同受力与约束情况下进行静力学分析,得出一些对生产实际具有指导意义的结论。     

三层实木复合地板弯曲变形原因及控制措施

阐述了三层实木复合地板的结构特点,对其产生弯曲变形的原因进行分析,并结合生产实际提出了三层实木复合地板的质量控制措施。     

Same Recovery Level of Compressed Chinese Fir Wood Can Be Obtained Through Different Heating Fixation Pathways

The recovery of compression set (RS) of wood after dry heating or steam treatment mainly depends on the temperature and time of treatment. For quantitative elucidation, a graph of intermediate RS was built with temperature (7) and time (t) as coordinates. In this graph (abbreviated as T-t planum), a series of curves of RS were created. This leads to a conclusion that same RS can be obtained by numerous different pathways. Further research on pathway equivalency based on T-t planum indicates that a low RS of 10% can be achieved definitely by different combinations of time and temperature. However, the fixation mechanism varies at different temperatures. On the equivalent pathways of higher recovery, the influence of temperature must be taken into consideration. The actual routes must be somewhat modified to achieve an expected result. This makes it possible for us to work out a best fixation pathway among all the possibilities, to eliminate the impact of heat on the mechanical properties of wood.     

木塑复合材料阻燃技术研究现状和趋势

综述了近年来木塑复合材料的常用阻燃剂类型（主要指无卤阻燃剂）、阻燃处理工艺及其阻燃性能的研究现状,对木塑复合材料的燃烧性能进行了分析,并结合木塑复合材料在阻燃方面存在的问题对其未来发展方向进行了展望。     

竹木复合材料的研究及发展

本文综述了国内外各类竹木复合材料的研究和发展状况,特别介绍了我国竹木复合材料的工业化情况,阐述了我国具有的竹材和人工林速生材的资源优势以及开发竹木复合材料的有利条件,最后指出我国竹木复合材料生产中存在的问题以及今后研究和发展的方向。     

我国结构用木质复合材现状与应用前景

论述了我国目前建筑用木结构的发展现状以及存在的问题,分析了工程木质材料建筑在我国的发展趋势,提出了应对措施和制定政策的建议.     

Fixation Property of Copper Triazole Wood Preservatives

According to AWPA E11-2006 standard,copper fixation rates of several copper-based formulations,such as ammoniacal copper,amine copper,and ammoniacal-ethanolamine copper,as well as alkaline copper quaternary(ACQ),were tested and compared in this paper.And the fixation rates of tebuconazole(TEB) and propiconazole(PPZ) in several formulations,such as copper azole,emulsified type and solvent type,were also compared.The determination of copper content in the leachate was analyzed by atomic absorption spectrom...     

Review on Preservative Treatment and Decay Resistance of Wood-based Composites

INTRODUCTIONWood-based composites are widely used as woodindustry is developing rapidly. It is quite necessary toimprove the decay resistance of wood-basedcomposites with preservatives or protect them in othermethods to meet the durability requirements. Therefore,many investigations are conducted in this field. Thispaper summarizes the previous and presentinvestigations on the methods of preservative treatmentand the decay resistance of different categories oftreated wood-based composites…     

压缩矩形材的动态热力学分析

水蒸气处理对压缩木材变形固定和提高木材尺寸稳定性均有很好效果,水蒸气处理使压缩木内部应力释放及结晶结构增加,压缩变形得以固定(井上雅文等,1994);使压缩木内部形成凝聚结构是变形固定的主要原因(東原貴志等,2000).     

木材及木材胶粘剂防腐研发现状及其发展趋势

简要回顾了木材及木材胶粘剂防腐技术研究与开发的技术背景和国内外发展现状,着重总结了木材防腐剂及生物质基木材胶粘剂防腐剂的种类、特性和应用情况;对本领域今后的发展趋势作了初步探讨。