橡胶木制造薄片刨花板的研究

本文论述了橡胶木小径材和枝桠材制造薄片刨花板的可行性,并通过正交试验对脲醛胶刨花板制造工艺进行了优化选择,同时也对酚醛树脂胶粘剂制造薄片刨花板和薄型刨花板进行了探索。试验表明,橡胶木可以制造出质地良好的刨花板。     

薄型竹丝刨花板生产工艺初探

以毛竹竹丝为原料,探讨了3mm薄型竹丝刨花板的生产工艺。采用正交试验方法,分析了板坯密度、热压温度、热压时间和施胶量对薄型竹丝刨花板性能的影响。试验结果表明,板坯密度和施胶量对板材的主要性能影响显著,而热压温度和热压时间无显著影响。本研究为薄型竹丝刨花板生产制定的生产工艺参数为:板坯密度0.65g/cm~3,热压时间6min,热压温度130℃,施胶量10%。     

比松（Bison）薄型刨花板连续生产线

比松（Ｂｉｓｏｎ）薄型刨花板连续生产线（ＳｙｓｔｅｍＭｅｎｄｅ）一比松在发展薄型刨花板连续生产线上取得了很大进展。市场需求产量高、生产灵活性大的设备。这些比松新开拓的设备均能予满足，其特点如下：安装简单、占地面积小、投资低、安装费低、维修费低、效率高...     

检测条件对人造板吸水厚度膨胀率测定结果的影响

研究了恒温恒湿处理和浸渍温度对人造板吸水厚度膨胀率检测结果的影响.结果表明:中密度纤维板和刨花板的测定值随着浸渍温度的升高而增大,两者存在着一定的线性关系,而胶合板则受水温影响很小;在浸渍前试件进行恒温恒湿处理与否会影响测试结果.对于刨花板和薄型中密度纤维板,进行恒温恒湿处理是必要的.     

关于发展中密度纤维板二次加工的一些看法

改革开放以来，我国的中密度纤维板（简称MDF）生产得以迅猛发展。这种发展势态在一定程度上说明了国人对MDF有了更深的了解，同时也表明市场对MDF有一定的需求。另外福州人造板厂的MDF生产带来的经济效益也产生了很大的影响，很多企业纷纷效仿企求获得同样的经济效益。但是与MDF并存的人造板产品，如胶合板、刨花板、走向刨花板、竹材胶合板等产量也在不断地增加，MDF除生产企业之间的竞争之外，其厚板将与厚胶合板、刨花板、定向刨花板、竹胶合板争夺市场，其薄板将与硬质纤维板、薄胶合板、薄型刨花板争夺市场。可以想象二、三年…     

连续平压法薄型刨花板生产工艺研究

通过对连续平压法生产薄型刨花板中混合胶配方和工艺的研究,结果表明将表层混合胶配方中固化荆用量调整至1.0～1.2 L、氨水用量调整至1.0～1.5 L、水用量调整至15～20 L,固化时间控制在10～15 s,拌胶后表层刨花含水率控制在8.5%～11%时,可提高连续压机薄板生产速度.素板厚度公差能精确控制在±0.2 mm内,产品质量稳定,薄板的合格率从90%提高到98%,产量由每月不足2 800m3提高到4 500m3.生产的5.0～9.0 mm薄板在广东市场已替代进口板,填补了国内无高档薄型刨花板的空白.     

全国人造板标准一览

一、现行的我国人造板标准1纤维板难燃中密度纤维板GB/T18958-2003中密度纤维板GB/T11718-1999薄型硬质纤维板LY/T1205-1997浮雕纤维板LY/T1204-1997硬质木纤维瓦楞板LY/T1203-1997硬质纤维板GB/T12626-1990地板基材用纤维板LY/T1611-20032刨花板刨花板GB/T4897.1~4897.7-2003石膏刨花板LY/T1598-2002定向刨花板LY/T1580-2000模压刨花制品(家具类)GB/T15105-1994船用贴面刨花板LY/T1057-19913胶合板胶合板GB/T9846.1~9846.8-2004集装箱底板用胶合板GB/T19536-2004竹编胶合板GB/T13123-2003汽车车厢底板用竹材胶合板LY/T…     

刨切薄木在宜昌地区的发展前景

<正> 刨切薄木是利用刨切法制成的花纹美丽、色泽悦目的一种片状装饰材料。按厚度分:在0.1mm以下称为微薄木,厚度在0.2～0.5mm的称为薄型薄木,厚度在0.6～1.5mm的称为厚型薄木。兴山县人造板厂从日本引进刨切薄木生产线,可生产薄型薄木和厚型薄木60万m~2,它已广泛应用于刨花板、细木工板、家具、缝纫机台板、木质地板等饰面上,它远销北京、上海、河北、广西、陕西和省内各地,深受人们欢迎,是饰面工业应用的主要方面。     

三维空芯定向刨花板冲击性能研究

三维空芯定向刨花板是一种新型的夹芯板,应用于木结构建筑中,可以有效地减轻墙体重量,简化墙体制造工艺,然而冲击性能是衡量结构性能的重要指标。笔者针对三维空芯定向刨花板、泡沫填充三维空芯定向刨花板进行低速冲击测试,对板材冲击力,位移和能量进行了比较研究。研究结果表明,三维空芯定向刨花板组成单元、三维空芯定向刨花板及泡沫填充三维空芯定向刨花板之间冲击性能差异显著;表板和三维定向刨花板芯板抗冲击力最大,三维空芯定向刨花板破坏位移最大;泡沫填充大大减少了三维空芯定向刨花板的抗冲击力和破坏位移,增加了冲击能量。     

均质刨花板备料设备的研制与开发

均质刨花板是叨年代初出现的刨花板新板种，其性能介于普通刨花板和中密度纤维板之间，是在普通刨花板基础上发展起来的刨花板家族的一个新成员。目前这种刨花板已在几个欧洲国家形成了一定的生产能力。国内在已有刨花板厂经技术改造生产出第一代均质刨花板的基础上，又有三条均质刨花板生产线开工建设，其中两条已正式投产。另外，国内尚有一些厂家正筹备建设大规模的均质刨花板生产线，表明该板种在国内具有良好的发展前景。１ 均质刨花板简介 与普通刨花板相比，均质刨花板密度稍高，结构密实，使板的力学性能尤其是表面和侧边再加工性能…     

Effects of sealed press on improving the properties of particleboard

To improve the properties of particleboard, boards were produced using a sealed press. With the sealed press, boards were processed under high-temperature and high-pressure steam. This increased the saturation temperature, causing a dramatic rise in temperature inside the board, faster curing of the binder, and a shorter pressing time. The boards were bonded with urea formaldehyde resin, melamine urea formaldehyde resin, or poly(methylene diphenyl diisocyanate) (PMDI). The sealed press improved the internal bond strength and thickness swelling of boards regardless of the binder used during the reduced pressing time. The increased bonding strength improved the board properties, allowing PMDI with a lower resin content to be used for bonding the boards.     

Fire resistance of thick wood-based boards

Thick wood-based boards are used as construction materials for walls and floors in Japan. In this study, fire resistance tests (ISO 834-1) and cone calorimeter tests (ISO 5660-1) were conducted for thick plywood, particleboard, and medium density fiberboard with sample thicknesses of about 28–30mm, and their suitabilities for quasi-fireproof or fire-preventive structures were evaluated. In the ISO 834-1 fire resistance test, the heat-shielding performance (insulation criterion) for walls was evaluated and the results showed that the larger the apparent density of a woodbased board, the higher its insulation performance. The insulation performance of thick wood-based boards in the fire resistance test could be forecast from the results of the cone calorimeter test, especially when the second peak of heat release rate appeared. In the cone calorimeter tests, the surface layer density of the plywood, particleboard, and medium density fiberboard was the dominant parameter for the time to ignition and initial heat release rate. These results indicate that thick wood-based board is a suitable fire-preventive construction material. Part of this study was presented at the Annual Meeting of the Architectural Institute of Japan, Hokkaido, Japan, August 2004     

Development of an air-injection press for preventing blowout of particleboard I: effects of an air-injection press on board properties

An air-injection press was developed to prevent particleboard from blowing out during the manufacturing process. The air-injection press, which has holes punched in the heating plates, injects high-pressure air into the board through the holes of one plate and releases the air through the holes of the other plate. The high-pressure air forces out vapor trapped within the board, thus preventing blowout. The newly developed press reduced the pressing time required for manufacturing board from high-moisture-content particles. However, the manufactured boards exhibited mechanical properties and dimensional stability inferior to conventionally manufactured boards.     

Properties of particleboard manufactured using an air-injection radio-frequency hot press

A hot press was used to manufacture particleboards (H boards). A radio-frequency hot press (for RH boards) and an air-injection radio-frequency hot press (for ARH board) were also used, and the effects of air injection on preventing blowout and board properties were analyzed. The thicknesses and densities of manufactured boards were 10 and 30 mm, and 0.6, 0.7, and 0.8 g/cm³, respectively. The investigation ascertained the effects of air injection in preventing blowout when a radio-frequency hot press is used. The increasing order of temperature was ARH board > RH board > H board during the final pressing stage. For the 30-mm-thick boards, the temperature of H board increased to 100 °C and remained constant at 100 °C even when the pressing time was extended. The temperature of the RH board increased to 100 °C more quickly than in the case of the H board and remained constant at 110–118 °C. The temperature of the ARH board increased linearly to 130–142 °C. For both the 10- and 30-mm-thick boards, the internal bond strength of the RH board was almost the same as that of the ARH board at densities of 0.6 and 0.7 g/cm³. In contrast, the internal bond strength of the RH board was lower than that of the ARH board at a density of 0.8 g/cm³. For the 10-mm-thick boards, the thickness swelling in the RH board was almost the same as that in the ARH board irrespective of the density. However, for the 30-mm-thick boards, the thickness swelling in the RH board was higher than that in the ARH board. The low plasticization of particles due to air injection presumably results in a high degree of thickness swelling.     

Comparison of the pressing behaviour of wood particleboard and strawboard

To improve the understanding of strawboard manufacturing processes, mat pressing behaviour of wood particleboard and strawboard bonded with urea formaldehyde resins were experimentally investigated and compared in terms of mat compressibility, transverse permeability, mat pressure, core temperature, core gas pressure and vertical density profile. The results have shown that straw particles are much more compressible and therefore require less platen pressure for pressing. Compared to wood particle and refined straw particle mats, hammer milled straw mats have low permeability and subsequently show high core gas pressure and high maximum core temperature during hot pressing, in addition to large differential densities between surface and core layers in the final pressed boards. It is recommended that a slower press closing rate and longer press opening time be used to develop the strawboard pressing schedule.     

杨木薄长刨花高密度板生产工艺的初步研究

研究热压温度、板材密度和施胶量3个生产工艺参数对薄长刨花板静曲强度、弹性模量、内结合强度及吸水厚度膨胀率的影响,得出最佳生产工艺条件。经过对实验数据进行分析,得出热压温度、板材密度和施胶量对刨花板各项物理力学性能均有一定的影响,其中板材密度和热压温度对板材各项物理力学性能影响最大。高密度刨花板最佳工艺条件为：热压温度155℃,板材密度0.88g／cm^3,施胶量12％     

喷蒸热压刨花板断面密度分布的研究

通过喷蒸热压工艺与常规热压工艺压制刨花板的试验结果,分析了刨花板断面密度分布情况与刨花板性能的关系,验证了喷蒸热压工艺的优点。     

浅析连续平压法生产MDF热压工艺的控制

连续平压法生产ＭＤＦ与多层压机生产在热压上有着明显的区别。正确认识这种区别并合理地控制热压工艺参数,是掌握连续平压法生产控制及保证ＭＤＦ产品结构合理、性能优良的关键所在。本文仅就其主要热压工艺的参数的控制进行分析讨论。     

中密度纤维板热压中VDP影响因素的控制系统研究

中密度纤维板的剖面密度形成于热压过程,影响剖面密度的热压温度、热压压力、压机速度以及压板间距和板坯含水率,也是连续热压控制过程中的主要控制对象.本文通过不同的检测手段对其影响因素进行检测,建立以PLC为控制核心的MDF连续热压控制系统.并对热压温度参数、热压压力参数进行模糊PID控制,从而有效地生产出符合要求的高质量中密度纤维板.     

Performance of particleboard manufactured using air-injection press II: effects of board density and thickness on the performance of board manufactured from low-moisture particles

Particleboards of different densities (0.6, 0.7 and 0.8 g/cm³) and thicknesses (10 and 20 mm) were manufactured from low-moisture particles using an air-injection press. The effects of the air injection on preventing blowout of the boards of different densities and thicknesses were investigated by artificially creating blowout-prone conditions using metal frames. The effects of the air-injection pressure on the board performance were also investigated. 10-mm-thick boards of 0.8 g/cm³ pressed at 170 °C blew out when air was not injected, but were successfully manufactured by injecting air. 10-mm-thick boards at 150 °C showed constant internal bond (IB), regardless of density, but at 170 °C, IB was higher in boards of higher densities. This was likely due to accelerated hardening of the urea–formaldehyde resin at 170 than 150 °C. At both pressing temperatures, low air-injection pressure did not cause blowout and a reduction in board performance. Air injection also prevented the blowout of thick boards of 20 mm and enabled successful manufacture, showing its effectiveness. The IB of the 20-mm-thick board manufactured using the air-injection press exceeded that of 20-mm-thick board manufactured using an ordinary hot press.