分子筛前驱体对定向刨花板性能的影响

人造板阻燃研究中常将分子筛用作阻燃添加剂或协效剂,但合成分子筛通常使用水热方法,耗能大、流程复杂.本研究采用LTA型分子筛的合成前驱体浸渍处理刨花并制备阻燃定向刨花板(OSB).通过热重分析(TGA)和极限氧指数(LOI)测试对浸渍处理刨花的热分解行为和燃烧性能进行考察,采用锥形量热测试和力学性能测试探究了分子筛前驱体...     

Study on sheet material made from zephyr strands V: Properties of zephyr strand board and zephyr strand lumber using the veneer of fast-growing species such as poplar

Zephyr strand board (ZSB) and zephyr strand lumber (ZSL) were produced using zephyr made from poplar veneer to investigate the greater utilization of low-density poplar as a structural material. These materials were then compared to ordinary plywood, laminated veneer lumber (LVL) from poplar veneer, lauan plywood, and particleboard. The bending properties (moduli of rupture and elasticity) of ZSB proved superior to those of poplar plywood: and ZSL produced from poplar veneer zephyr had bending properties greater than ordinary LVL from poplar veneer. Apparently, the conversion of the poplar veneer into zephyr material had a positive effect on bending properties. Additionally, poplar ZSB had bending properties superior to those of lauan particleboard and equal to those of lauan plywood. The internal bond strength of poplar veneer ZSB was nearly two times greater than that of lauan particleboard.Parts of this report were presented at the international symposium on the utilization of fast-growing trees, Nanjing, China, October 1994. Report IV appeared inMokuzai Kogyo 49:599, 1994     

Manufacture of oriented board using mild steam treatment of plant fiber bundles

This study investigated the effects of mild steam treatment (0.1 MPa for 2 h) of natural bio-based fibers and orientation (0° and 90°) of those fibers in various fiberboards. Ramie bast, pineapple leaf, and sansevieria fiber bundles were used as materials. The composite fiberboards were prepared using phenol-formaldehyde (PF) resin. To investigate the effect of mild steam treatment on wettability, contact angles of PF resin to the fiber were measured. The mechanical properties of the boards were examined as well as their dimensional stability. The contact angle data showed that mild steam treatment was effective in improving the wettability of fibers. Unioriented steam-treated boards showed better performance of internal bond (IB), moduli of rupture (MOR) and elasticity (MOE), thickness swelling (TS), and water absorption (WA) than other boards. Unioriented steam-treated sansevieria board with longitudinal fiber direction showed higher average values of MOR (403 MPa), MOE (39.2 GPa), and IB (1.33 MPa) and lower values of TS (5.15%) and WA (8.68%) than other boards. The differences in the mechanical properties and dimensional stability of boards were found mainly due to the differences in the ratios of fiber fraction of the boards to the density of the fiber bundles.     

Development of binderless particleboard from kenaf core using steam-injection pressing

Binderless particleboards were successfully developed from kenaf core using the steam-injection press. The effects of board density, steam pressure, and treatment time on the properties of the board were evaluated. The target board densities were relatively low, ranging from 0.40 to 0.70g/cm³. The properties [i.e., moduli of rupture (MOR) and elasticity (MOE) in both dry and wet conditions, internal bonding strength (IB), and water absorption (WA)] of the boards increased linearly with increasing board density. Steam pressure and treatment time also affected the board properties. The bending strength and IB were improved with increased steam pressure. A long steam treatment time contributed to low thickness swelling (TS) values and thus better dimensional stability. The appropriate steam pressure was 1.0MPa, and the treatment time was 10–15min. The properties for 0.55g/cm³ density boards under optimum conditions were MOR 12.6MPa, MOE 2.5GPa, IB 0.49MPa, TS 7.5%, and wet MOR 2.4MPa. Compared with the requirement of JIS 5908, 1994 for particleboard, kenaf binderless boards showed excellent IB strength but relatively poor durability.Part of this report was presented at the 19th Annual Meeting of the Japan Wood Technological Association, Tokyo, October 2001     

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。     

Manufacture of composite board using wood prunings and waste porcelain stone

The objective of this study was to develop a method for the effective use of both pruned wood and porcelain stone scrap. Thus, we manufactured a wood-porcelain stone composite board, which has excellent waterproof property and incombustibility properties. In addition, we examined the conditions needed to manufacture the wood-porcelain stone composite board as a construction material and evaluated the physical and mechanical properties of this board based on the Japanese Industrial Standard. The main results obtained were as follows: the wood-porcelain stone composite board made from pruned wood and porcelain stone scrap had excellent thickness swelling performance and the board had incombustibility properties that were better than commercial oriented strand board. In both single-layer and three-layer composite boards with weight ratios of porcelain stone particles of 40%, the internal bond strength exceeded the standard value of type 18 particleboard of JIS A 5908. However, the bending properties of the composite board were inferior to the type 18 particleboard standard. Therefore, it will be necessary to improve the bending properties of the board by changing the particle sizes of both the porcelain stone scrap and the pruned wood component. Part of this article was presented at the 57th Annual Meeting of the Japan Wood Research Society at Hiroshima, August 2007     

Production and properties of Japanese oriented strand board I: effect of strand length and orientation on strength properties of sugi oriented strand board

Oriented strand boards (OSB) were made using sugi wood strand with different lengths at different free fall distance conditions. Strand alignment and mechanical properties of sugi OSB were evaluated. Results obtained can be summarized as follows. The alignment angle distribution was greatly affected by both free fall distance and strand length. It was found that the standard deviation of the angles can be a measure for predicting the distribution when employing the von Mises distribution function with concentration parameter. The Monte Carlo simulation showed an agreement between the theoretical considerations and the experimental results on the strand alignment. The mechanical properties as affected by both strand length and layer structure were determined. Bending properties could be equal in both directions at 25% face layer ratio. Young's modulus obtained by the in-plane vibration method showed almost linear relation to the face layer ratio. No significant differences or only a slight difference was observed for the internal bond strength, plate-shear modulus, and nail resistance properties. Further studies are necessary.     

Manufacture and properties of binderless particleboard from bagasse I: effects of raw material type, storage methods, and manufacturing process

Binderless particleboards were manufactured from sugarcane (Saccharum officinarum L.) bagasse by steam-injection pressing and by using hot pressing as a reference method. The inner layer (core/pith) and the outer hard fibrous layer (face/rind) of bagasse were used as raw materials. The effects of bagasse type, manufacturing process, and storage method on the mechanical properties of binderless particleboards were investigated. The results showed that the bagasse pith particles provided better board properties than bagasse rind particles. It seemed that bagasse pith particles were more easily deformed than bagasse rind particles, enlarging the bonding contact area. The severe conditions of steam-injection pressing caused delamination on the bagasse pith binderless boards with densities of 0.6 g/cm³ or higher, and gave poor bonding quality. However, steam-pressed boards showed relatively higher board properties than hot-pressed boards. The storage method of sugarcane bagasse affected the chemical composition and the board properties. It was shown that the extent of self-bonding formation depends on the chemical and morphological properties of lignocellulosic materials, as well as on the manufacturing conditions. Part of this paper was presented at the 5th International Wood Science Symposium, Kyoto, Japan, September 2004     

定向刨花板挠度与蠕变试验

采用正交异性的挠度方程计算四边筒支定向刨花板的中心点挠度，并在实验基础上对此进行验证，从而得到满足实际生产的定向刨花板挠度值计算公式，并对６ｍｍ，１０ｍｍ定向刨花板进行蠕变测试，找出持荷时间与挠度之间关系，进一步分析终挠度值与初挠度值之比，静曲强度和弹性模量损失量。     

单板的厚度和配置方式对复合定向刨花板性能的影响

研究了单板厚度和配置方式对复合定向刨花板性能的影响。试验发现：１．复反的强度与刚度随着单板配置方向的改变而明显改变。当单板纹理方向与ＯＳＢ定向方向平行时，复合板在平行于ＯＳＢ定向强度与刚度明显增加，而且在纵横两个方向上的差异也增大；而当单板纹理方向与ＯＳＢ定向方向垂直时，复合板在纵横两个方面的强度与刚度趋于均匀。２．本试验中如果单板以纹理方向的与ＯＳＢ定向方向垂直配置，则在单板厚度为０．８５ｍｍ时     

世界定向刨花板发展现状及最新市场情况

主要介绍了目前世界OSB的生产制造现状和最新市场情况,探讨了OSB在国际贸易中的价格变化规律,以及我国与世界的OSB贸易现状,并为我国OSB行业健康发展建言献策。     

Effect of board density and layer structure on the mechanical properties of bamboo oriented strandboard

This study examined the effects of density and layer structure on the mechanical properties and dimensional stability of strandboard manufactured from moso bamboo (Phyllostachys pubescens). The strandboard was fabricated in a laboratory at five densities and three different structures including a randomly oriented homogenous board, a unidirectionally oriented homogenous board, and a three-layered board with a cross-oriented core layer (BOSB). Bamboo strand alignment distribution could be predicted using the von Mises distribution function. Bending properties increased with increasing density and were affected by layer structure. The modulus of rupture (MOR) of the threelayered board in the parallel direction increased remarkably compared with the random board MOR; in the perpendicular direction, it exhibited less strength reduction. Elastic properties of the three-layered board could be predicted using elastic constants of the unidirectional board. Internal bond strength (IB) was greatly affected by density, but the layer structure effect did not appear in IB. Linear expansion per unit moisture change ranged from 0.017 to 0.022 for random and three-layered boards; these values are comparable with or lower than values for commercial board.     

辊压法薄型中纤板生产线工艺设备

对比松公司门德系统连续辊压法生产薄型中纤板的工艺特点、存在问题、主要设备及技术经济指标作一简介。     

定向刨花板的应用现状与增值加工

OSB是一种环境友善、符合可持续发展的材料。笔者介绍了OSB特点、国内外生产现状,尤其是介绍了OSB在北美住宅及其他工业中的应用情况,以及为拓展其用途而进行的OSB产品增值加工研究。     

三种竹碎料板的物理力学性能比较分析

对三种竹碎料板的物理力学性能进行了比较分析。板材弹性模量：竹席增强竹碎料板〉竹碎料/木纤维复合板〉普通竹碎料板;静曲强度：竹席增强竹碎料板〉竹碎料/木纤维复合板〉普通竹碎料板;吸水率：普通竹碎料板〉竹碎料/木纤维复合板〉竹席增强竹碎料板;吸水厚度膨胀率：普通竹碎料板〉竹碎料/木纤维复合板〉竹席增强竹碎料板;内结合强度：竹碎料/木纤维复合板〉竹席增强竹碎料板〉普通竹碎料板。     

竹定向结构刨花板的研究现状及其展望

概述了国内外竹定向结构刨花板的研究进展,总结了目前生产应用研究中存在的问题和不足,并提出了今后的研究发展方向。     

热压温度及板材密度对竹木复合层积材顺纹抗压强度的影响

通过单因变量两因素重复试验,以毛竹竹篾和桦木单板为原料,使用酚醛树脂胶黏剂压制竹木复合层积材,分析热压温度及板材密度对竹木复合层积材顺纹抗压强度的影响。结果表明,在试验选定因素水平范围内,热压温度和板材密度对竹木复合层积材顺纹抗压强度影响显著,板材顺纹抗压强度随热压温度的升高而增强,但145℃与160℃两水平之间差异并不显著;不同密度对板材顺纹抗压强度的影响差异显著,板材的顺纹抗压强度随板材密度的增大而增大;在其他工艺参数相对不变的情况下,热压温度与板材密度的交互作用对板材顺纹抗压强度的影响并无显著的影响。     

Preparation of composite board using foil-laminated and plastic-laminated liquid packaging paperboard as raw materials

We investigated the properties of composite board formed using base sheets of aluminum foil-laminated and polyethylene (PE) plastic-laminated liquid packaging paperboard (LP) as an alternative to recycling these items in wastepaper stream. Boards of different specific gravities ranging from 0.55 to 0.75 were made by pressing shredded LP blended with urea resin having resin content of 6%–10% at 180°C. Subsequently, we also prepared mixed particleboard [wood (WD) particles and LP mixed], three-layered particleboard (LP as the middle layer, WD in the upper and lower layers), and wood particleboard all having resin content of 10% and various specific gravities. Static bending and internal bonding strengths and thickness swelling of the specimens were determined to examine their properties. At the same specific gravity, the properties of LP particleboards were affected by their resin content. The modulus of rupture (MOR), modulus of elasticity (MOE), and internal bond strength of the LP particleboards increased with increasing specific gravity of the boards at the same resin content, but thickness swelling of the LP particleboards showed the reverse trend. The average MOR of the LP particleboards approximated that of the mixed particleboards and was greater than those of the three-layered particleboards and wood particleboards. Internal bond strength and thickness swelling of the LP particleboards were smaller than those of the other particleboards. Based on the above observations, we deemed that LP can be made into composite boards with adequate properties either alone or mixed with wood particles.     

基于竹材生物学特性和材性适应性的竹大片/定向刨花板生产技术的研发

根据对云南主要材用丛生竹组织结构、主要物理力学性质和化学组份的研究和对其它材用竹材性的了解、对竹大片/定向刨花板工业生产技术一系列的实验室单因素、多因素等重复、优化试验和工业性试验直至成套生产设备的研制和生产线的建设、生产和产品应用的结果,运用人造板基本工艺原理,揭示了竹大片/定向刨花板的组成结构、生产工艺和设备技术条件对竹材特殊的生物学特性、竹材材性的适应性。以此为基础所形成的竹大片/定向刨花板工业生产成套技术因此得以达到工业生产水平。     

工艺参数对稻壳-木刨花复合板内结合强度的影响

采用均匀实验设计方法,通过单因素及两因素间交互作用情况,探讨工艺参数对稻壳-木刨花复合板内结合强度(IB)的影响。在试验研究范围内,密度、芯层比例、芯层施胶量、热压温度、热压时间对复合板IB影响显著,表现为IB随密度的增大先增大后减小,随芯层比例和芯层施胶量的增加而增加,随热压温度和热压时间的增加而减小。当密度为0.77 g/cm3、芯层比例为60%~65%、芯层施胶量为4.5%、热压温度为170℃、热压压力为2.5 MPa、热压时间为20 s/mm时,在兼顾生产效率与生产成本的同时,能够获得IB良好的稻壳-木刨花复合板。