国外结构人造板尺寸稳定性的研究技术

国外结构人造板(如定向结构板、大片刨花板、华夫刨花板等)主要用作建筑材料,对产品的尺寸稳定性要求很高,许多研究者在如何提高产品尺寸稳定性方面作了大量的研究工作。文中综述了大量的科研成果,介绍了国外结构人造板尺寸稳定性的研究技术,包括引起结构人造板尺寸不稳定的缘由,结构人造板尺寸稳定性的评价方法,影响结构人造板尺寸稳定性的工艺因素以及提高结构人造板尺寸稳定性的措施。     

人造板机电包装材料应用现状及前景

介绍了定向结构刨花板、单板层积材、竹木复合材料、木塑复合材料、农作物秸秆材料等5种人造板机电包装材料在包装行业中的应用情况,分析了人造板机电包装材料在国内的应用前景,并对人造板在机电产品包装中的应用前景和工作重点进行了展望.     

新型木质人造板的生产及其在建筑业上的应用

人造板在建筑业方面有着极大的市场潜力，发展人造板工业必须扩大其在建筑领域内的应用。本文着重介绍了定向刨花板、波纹板、单板条层积材、华夫板、重组木、单板层积板等主要结构人造板国内外生产和研究进展、生产工艺及用途，并对发展人造板在建筑业上应用提出五点建议。     

人造板剖面密度测定仪的研制

剖面密度的测定与分析是人造板质量检验与控制的重要手段。本文介绍了测定与分析人造板剖面密度的重要意义，并着重探讨了剖面密度仪的软、硬件结构及工作流程。     

TMJ-A人造板弹性模量无损检测显示机的误差因素分析

人造板无损检测是在线检测结构用人造板力学性能、保证产品质量的重要环节。本文介绍了弹性模量无损检测设备的功能和工作原理 ,从测试方法、机械系统、控制系统几个方面入手 ,分析了测试误差的形成原因及影响因素 ,为进一步提高人造板无损检测设备的测试精度和可靠性提供依据     

TMJ—1人造板弹性模量无损检测显示机的误差因素分析

人造板无损检测是在线检测结构用人造板力学性能、保证产品质量的重要环节。本文介绍了弹性模量无损检测设备的功能和工作原理，从测试方法、机械系统、控制系统几个方面入手，分析了测试误差的形成原因及影响因素，为进一步提高人造板无损检测设备的测试精度和可靠性提供依据。     

加拿大人造板工业概况

加拿大是一个林业和木材加工工业都很发达的国家。该文简要介绍了有加拿大人造板工业（包括胶合板、定向结构板、刨花板和中密度纤维板）的概况，以及最新的人造板生产技术。     

浅析人造板生产发展的新特点

介绍国内外人造板发展的近况,结合当前资源现状以及人造板产品的市场变化,重点阐述人造板生产设备的发展新趋势,在分析连续压机线生产人造板优势的基础上,建议重点发展原料消耗少、自动化程度和产品附加值高的LVL及OSB等结构板材。     

我国定向结构刨花板的现状和发展前景

本文介绍了定向结构刨花板的性能、用途和国内外发展的状况,提出了在我国发展定向结构刨花板应解决的几个问题,指出不论从人造板的发展趋势,还是从保护生态环境,发展迷生人工林培育与利用的可持续发展策略上看,定向结构刨花板作为新型的人造板在我国必将有巨大的发展潜力。     

室内用人造板与低甲醛释放脲醛树脂胶粘剂的开发与应用

对近年来我国人造板生产所用原料结构变化和设备与工艺技术进展进行了简述,分析了人造板制造对胶粘剂的一些新的要求,并介绍适应这些要求的各类低甲醛释放UF和MUF系列胶粘剂。     

结构用慈竹单板层积材的制备工艺与性能

以慈竹和毛竹为材料,采用竹材纤维可控分离技术,在去除竹青和竹黄后,制造竹材单板层积材,并测定板材的性能.结果表明:以去青黄竹材压制单板层积材的性能,高于未处理竹材;慈竹单板层积材的性能高于毛竹;随着密度的增大,30 mm厚慈竹单板层积材的力学强度提高,可达到集装箱底板用胶合板和风电叶片材料的标准要求.     

Differences of tensile strength distributions between mechanically high-grade and low-grade Japanese larch lumber III: effect of knot restriction on the strength of lumber

It is well known that the presence of knots in structural lumber is one of the most important strengthreducing factors. For practical purposes, visual grading including knot restriction is an effective method for nondestructive evaluation of strength. Edge knot restriction for not only visually graded lumbers but also mechanically graded lumbers is specified in the Japanese agricultural standards for glued laminated lumber. We conducted experimental studies on differences of tensile strength distributions between mechanically high-grade and low-grade Japanese larch (Larix kaempferi, carriere) lumbers daily used for manufacturing glued laminated timbers in Nagano, Japan. We then examined the additional visual grading of mechanically graded lumbers for nondestructive evaluation. We visually graded the prepared mechanically graded lumber by focusing on the knots' area ratio of grouped knots. We confirmed that the higher visual grade related to the stronger tensile strength, similar to our present knowledge; but the effects of knot restriction were reduced when the length of the lumber increased in view of nonparametric 5th percentiles of tensile strength. The differences in the strength/elasticity ratio between mechanically high-grade and low-grade lumber were negligible. It was clear that the length effect on the ratio in visually graded high-grade lumber was smaller than that of visually graded low-grade lumber. It was thus concluded that knot restriction should have little effect on the tensile strength of mechanically graded lumber.     

木结构建筑用落叶松单板层积材生产工艺及其性能评价

阐述了单板层积材产品的优点,介绍了以落叶松为原料,利用胶合板生产设备加工制造单板层积材的工艺技术及产品性能.     

Study on Physical and Mechanical Properties of Structural Laminated Bamboo Panel

In this paper, the physical and mechanical properties of laminated bamboo lumber were studied by testing moisture content, delamination ratio, horizontal shear strength, MOE and MOR of the structure-use material, in the same time, these subjects of finger-joint were tested too. The results showed that, the horizontal shear strength, MOR, MOE of laminated bamboo were superior to the ordinary structure-use timber in architecture, such as Pinus. The performance of aging test was not extraordinary, although the physical and mechanical properties of laminated bamboo lumber decreased after aging test, these properties were beyond Pinus yet.     

单板厚度对小径柚木单板层积材力学性能的影响

采用3.00、4.50、6.00mm厚度小径柚木单板制备单板层积材(LVL),研究单板厚度对单板层积材力学性能的影响。结果表明:单板厚度对于层积材静曲强度和弹性模量有显著影响,随着单板厚度增加,静曲强度与弹性模量减小;强度均达到GB/T20241—2006《单板层积材》中不同等级要求。生产相同厚度单板层积材时应根据耗胶量与所需力学强度选择合适单板厚度,寻求成本与质量的平衡。     

竹材加工新方法--曲面胶合层积技术

简述了竹材的机械物理性能,提出了不同于传统竹材加工方法的竹材曲面胶合新思路,定义了曲面胶合的涵义, 并从理论上研究了这一工艺条件下的单体加工方法及出材率,最后探讨了曲面胶合层积材的生产可行性。     

Effect of size on the bending strength of laminated veneer lumber

Summary The effect of size on bending strength has been experimentally determined for laminated veneer lumber. Width was found to have no effect on bending strength. The effect of depth times length on bending strength obtained by the slope method was about 0.075, which is in good agreement with the results obtained by the shape parameter method. The effect of length is somewhat more severe than the effect of depth. Size was found to have no effect on modulus of elasticity or modulus of rigidity.In addition, the relationships between bending strength, modulus of elasticity and density of laminated veneer lumber were experimentally modelled.The author is pleased to acknowledge Research and Development Manager Matti Kairi, who represents the Kerto laminated veneer lumber manufacturer of Finnforest Oy, for fruitful co-operation over several years. The patience of senior research scientist Markku Kortesmaa, who calculated and several times explained the details of Appendix A for the author, is also acknowledged     

圆筒形单板层积材的研究

圆筒形单板层积材(简称圆筒LVL)是一种新型木质工程材料，它是以螺旋缠绕的方式将单板加工成交错层积的构造，从而抑制弹性模量的下降。圆筒LVL具有很好的力学性能和优良的工程性能，可广泛应用于建筑等领域。本文就圆筒LVL的制造方法、研究状况、特点及用途等进行了较为详细的归纳总结。     

工程结构材概述

介绍了工程结构材（包括单板层积材，胶合木，定向刨花板，重组木和单板条层积材）的性质，生产和应用现状及发展前景。     

检测方法对竹束单板层积材耐水性能测试结果的影响

耐水性能是竹束单板层积材的主要指标之一。本研究选用极限水浸泡处理法、20℃水浸泡处理法、63℃水浸泡处理法和28h循环水煮处理法四种方法,对竹束单板层积材的耐水性能进行测试,并对测试数据进行分析比较。结果表明:采用63℃水浸泡处理法和28h循环水煮处理法检测板材的耐水性能更科学,且试验周期较短,试验结果可靠。