谈谈E1级刨花板生产过程中的几点体会

介绍在采用E_1级脲醛树脂胶的情况下,生产E_1级刨花板对设备、胶粘剂、刨花制备、热压工艺及检测的要求。     

挤压法生产刨花板的现状和发展前景

阐述了挤压法生产刨花板的现状、成型原理、优良特性,并对挤压法生产空芯刨花板的发展前景进行了展望.     

E1级刨花板制备工艺的研究

研究讨论了热压温度、热压时间、板坯含水率、固化剂种类及用量等刨花板生产工艺参数对刨花板中游离甲醛含量的影响,从而对刨花板的生产工艺进行优化,得出了最佳工艺参数,并在工厂的批量生产中得到了验证。     

中国刨花板工业发展之反思

通过对中国刨花板工业发展史的回顾,围绕生产设备分析阐述了其“两起两落”的诸方面因素。为新建刨花板项目及设备选型提出了一些建议。     

Hydrogen Peroxide as a Resin Cure Accelerator

The reaction of hydrogen peroxide with conventional resin adhesives was sufficiently exothermic for the heat to accelerate and improve resin cure in the hotpress. As a consequence, pressing times for medium density fibreboard, particleboard, and plywood could be reduced by up to 30% and, in some cases, better resin cure permitted a reduction in binder level. Differences in the interaction of hydrogen peroxide with various adhesives were observed and a catalyst was found to enhance the exothermic effect.

The behaviour of hydrogen peroxide in combination with a tannin-based binder and wood fibre was studied over a wide temperature range. Below 60°C the system was stable. At 70°C the initial reaction was endothermic followed by a slow exothermic reaction. At hotpressing temperatures the exothermic reaction was rapid but controllable. It was concluded that the hydrogen peroxide-tannin-fibre system does not impose an additional safety hazard on medium density fibreboard plant operation.     

Effects of formaldehyde to urea mole ratio on thermal curing behavior of urea–formaldehyde resin and properties of particleboard

As a part of abating the formaldehyde emission (FE) of urea–formaldehyde (UF) resin, this study was conducted to investigate the effects of formaldehyde to urea (F/U) mole ratio on thermal curing behavior of UF resins and properties of PB bonded with them. UF resins synthesized at different F/U mole ratios (i.e., 1.6, 1.4, 1.2, and 1.0) were used for the manufacture of PB. Thermal curing behavior of these UF resins was characterized using differential scanning calorimetry (DSC). As the F/U mole ratio decreases, the gel time, onset and peak temperatures, and heat of reaction (ΔH) increased, while the activation energy (E_a) and rate constant (k) were decreased. The amount of free formaldehyde of UF resin and FE of PB prepared decreased in parallel with decreasing the F/U mole ratio. The internal bond strength, thickness swelling, and water absorption of PB was slightly deteriorated with decreasing the F/U mole ratio of UF resins used. These results indicated that as the F/U mole ratio decreased, the FE of PB was greatly reduced at the expense of the reactivity of UF resin and slight deterioration of performance of PB prepared. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 1787–1792, 2006     

新型绿色建筑结构绝缘板力学性能的试验研究

结构绝缘板是采用秸秆板或定向结构板作为结构面板,粘结于绝缘泡沫芯材两侧而形成的夹芯板结构,具有良好的节能环保特性.采用真空槽对不同厚度组合的结构绝缘板进行均布荷载下试验,得到材料特性和其相应的荷载-挠度曲线,为结构绝缘板理论分析和计算公式的获得创造条件.     

低甲醛释放量刨花板生产技术的研发

介绍了使用低甲醛与尿素物质的量之比的脲醛树脂(UF)/三聚氰胺尿素甲醛共缩聚树脂(MUF)混合体系以及NH4Cl+CHOOH双组分复合固化剂生产低甲醛释放量刨花板的工业化生产技术,所生产的刨花板甲醛释放量低于5mg/100g,2h吸水厚度膨胀率低于8%。     

Cracking of Short Lap Joints

In the lap joint shown in Figure 1, the sheets of elastic material AB and CD are originally plane and joined completely over their mating surfaces with a very thin adhesive of fracture energy R, When tensile forces F are applied to test the joint, cracks propagate from the points C and B to cause eventual separation of the elastic sheets.     

水泥粉煤灰刨花板综述

介绍了水泥粉煤灰刨花板的发展现状、性能及其生产工艺,详细阐述了粉煤灰水泥刨花板目前所存在的问题,概述了二氧化碳在水泥粉煤灰刨花板生产中的应用。