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互花米草木刨花复合碎料板制造工艺 总被引：1，自引：0，他引：1
以互花米草碎料与木刨花为原料,以脲醛树脂为胶粘剂制作碎料板。采用正交试验探讨原料配比、施胶量、密度及防水剂添加量对碎料板性能的影响,结果表明:互花米草添加比例为35%、施胶量为14%、密度为0.75 g.cm-3、防水剂添加量为1.0%时,复合碎料板的各项性能达到最优。 相似文献
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《Wood material science & engineering》2013,8(2):185-188
AbstractParticleboard can be commonly produced by flat-pressing and extrusion methods. The elastic properties of the flat-pressed particleboard have been studied a lot, but the extruded particleboard has not had much attention. Six elastic properties of two commercial extruded tubular particleboards with different solid density were measured by a three-point bending test and electric resistance gages method. The elastic modulus in the extruded direction of the tubular particleboard is only one-tenth of the other two directions. The extruded tubular particleboard can not only be regarded as an orthotropic material but also a transverse surface isotropic material. The isotropic plane is the transverse section of the extruded particleboard which is different from the flat-pressed particle with the length–width plane as the isotropic plane. The checking of the data we measured demonstrated suitability and rationality. 相似文献
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Muhammad Navis Rofii Satomi Yumigeta Yoichi Kojima Shigehiko Suzuki 《Journal of Wood Science》2013,59(5):402-409
The purposes of this study were to examine the use of furniture mill residues containing high-density raw materials in particleboard production and to evaluate the effect of mixing several types of furnish on board performance. Wood wastes collected from the furniture industry in Japan containing matoa (Pometia pinnata), Douglas-fir (Pseudotsuga menziesii), and sugi (Cryptomeria japonica) with different particle shapes were prepared as raw materials for use in the manufacture of experimental particleboards. Seven board types and three mixed boards were manufactured with three replications. Methylene diphenyl diisocyanate (MDI) resin was applied at 6 % content in mat preparation. The pressing conditions were temperature of 180 °C, initial pressure of 3 MPa, and pressing time of 5 min. The target density was 0.72 g/cm³. This study showed that matoa particleboard had properties suitable for use in interior applications, although its properties were considered inferior compared with other particleboards. Improvement of matoa particleboard could be achieved by mixing with higher quality wood particles such as those from sugi or Douglas-fir. The furnish type used in this study affected board performance. All residues from furniture mills have the potential to be used for particleboard production, even when they contain different furnish types and wood species. 相似文献
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Preparation and properties of waste tea leaves particleboard 总被引：4，自引：0，他引：4
Shi Jin-shu Li Jian-zhang Fan Yong-ming Ma Hong-xia 《中国林学(英文版)》2006,8(1):41-45
Urea-formaldehyde (UF) adhesive is the main source of formaldehyde emission from UF-bonded boards. The components in waste tea leaves can react with formaldehyde to serve as a raw material in the production of low formaldehyde emission boards. In our study, waste tea leaves and UF adhesive were employed in the preparation of waste tea leaves particleboard (WTLB). An orthogonal experimental method was applied to investigate the effects of process parameters on formaldehyde emission and mechanical properties of WTLB. The results indicated that: 1) waste tea leaves had the ability to abate formaldehyde emission from boards; and 2) density of the WTLB was a significant factor affecting its modulus of rupture (MOR), modulus of elasticity (MOE) and internal bonding (IB). 相似文献
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以市售刨花板和三聚氰胺浸渍纸为原料,制备三聚氰胺饰面刨花板.采用L9（34）正交试验考察热压温度、热压时间、热压压力3个热压工艺参数对三聚氰胺板甲醛释放量的影响.采用国家标准（GB/T 17657-1999）《人造板及饰面人造板理化性能试验方法》干燥器法检测甲醛的释放量.试验结果表明,热压温度对甲醛释放量影响最大、热压时间其次、热压压力影响最小,其中热压温度对甲醛释放量有显著影响,热压时间和热压压力的影响并不显著.热压工艺参数提高,会引起热压后的三聚氰胺板前期的甲醛释放量明显升高.确定饰面刨花板甲醛低释放的最优化生产工艺参数为热压温度170℃、热压时间40s、热压压力2.5 MPa. 相似文献
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以相思、桉树2树种的木材加工剩余物为原料,研究两步法刨花模压板的制造工艺以及各工艺参数与板材性能的关系.结果表明:以刨花预压制坯再进行热压模压的两步法刨花模压工艺,制备具有立体结构的刨花模压装饰板材的技术路线是可行的.相思和桉树2树种的对比试验研究结果表明:相思刨花模压制品性能优于桉树刨花模压制品.按选用工艺参数,相思原料的刨花模压制品性能完全达到相关国家标准.在工艺参数与板材性能相关性研究中,板材密度对模压板表观性能、内结合强度、静曲强度等板材性能具有显著性影响;热压模压温度和热压模压时间对板材吸水厚度膨胀率有较显著影响.施胶量增加,板材的各种物理力学性能都会提高,尤其对吸水厚度膨胀率影响最为显著. 相似文献
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《Wood material science & engineering》2013,8(4):217-224
Abstract Considering ongoing global deforestation and the increased demand for raw materials in all wood-processing sectors it is necessary to seek and employ alternative resources. Agricultural residues are potential sources of alternative lignocellulose-based raw materials. Research on substitute materials for wood panel production mainly focused on physical and mechanical properties of boards while much remains to be learned about machining. Therefore, studies were carried out to analyse the relationship between ash and silica content and their impact on tool wear. Ash and silica contents of agricultural residues were determined following ISO 3340. Particle morphology and elemental composition of selected materials were analysed using scanning electron microscopy and energy-dispersive X-ray analysis. Tool wear tests were carried out using particleboards made from wheat straw, canola straw and spruce. Analyses of various plant materials displayed no correlation between ash and silica content. Bio-mineralised silica structures in wheat and canola were different compared to coarse silica found in wood-based particleboard. Tool wear caused by these agricultural residues was just moderately increased compared to wood, despite the fact that their silica contents were many times higher. Furthermore, the impact of abrasive substances on wear behaviour was influenced by the density of the panels. 相似文献
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Effects of mat moisture content and press closing speed on the formation of density profile and properties of particleboard 总被引：1，自引：1，他引：0
Isocyanate resin-bonded 0.5 and 0.7 g/cm3 lauan (Shorea sp.) particleboards were produced from mats with uniform and distributed moisture content (MC) distributions, using three hot press closing speeds. The effects of these processing variables on the formation of density profile in particleboard and board properties were analyzed statistically. A definition of the density profile was introduced, and the correlations among the various defining factors were established. The results are summarized as follows. (1) The peak density (PD) of particleboard could be increased, with a slight reduction in the core density (CD), using mats with different MC distributions. (2) In a conventional density profile, CD and PD are highly dependent on the board mean density (MD); and the gradient factor (GF), peak distance from the faces (Pdi), and peak base (Pb) are significantly correlated to each other, at the 99% significance level. (3) Greater press closing speed reduces Pdi and Pb, with an increase in GF. (4) Greater press closing speed could increase the PD in board of low MD, with minimal effect on CD. (5) The modulus of elasticity (MOE) of particleboards from mats with high MC near the faces were consistently higher than those from mats with uniform MC, irrespective of the press closing speed, whereas their modulus of rupture (MOR) became indifferent at higher MD under slow and fast closing speeds. (6) Sanding does not improve the MOR and MOE of particleboard significantly. 相似文献
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This paper describes the features of binderless particleboard manufactured from sugarcane bagasse, under a high pressing temperature of 200–280 °C. Mechanical properties [i.e., modulus of rupture (MOR) and elasticity (MOE) in dry and wet conditions, internal bonding strength (IB)] and dimensional stability [i.e., thickness swelling (TS)] of the board were evaluated to investigate the effect of high pressing temperature. Recycled chip binderless particleboards were manufactured under the same conditions for comparison, and particleboards bonded with polymeric methylene diphenyl diisocyanate (PMDI) resin were manufactured as reference material. The target density was 0.8 g/cm3 for all of the boards. The results showed that the mechanical properties and dimensional stability of both types of binderless boards were improved by increasing the pressing temperature. Bagasse showed better performance than that of recycled chip as a raw material in all evaluations. Bagasse binderless particleboard manufactured at 260 °C had an MOE value of 3.5 GPa, which was equivalent to the PMDI particleboard, and a lower TS value of 3.7 % than that of PMDI particleboard. The MOR retention ratio under the dry and wet conditions was 87.0 %, while the ratio for the PMDI particleboard was only 54.6 %. The obtained results showed the possibility of manufacturing high-durability binderless particleboard, with good dimensional stability and water resistance, which previously were points of weakness for binderless boards. Manufacturing binderless boards under high temperature was effective even when using particles with poor contact area, and it was possible to express acceptable properties to allow the manufacture of particleboards. Further chemical analysis indicated a contribution of a saccharide in the bagasse to the improvement of the board properties. 相似文献
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石膏刨花板是以建筑石膏为胶凝剂, 以刨花为加强材料的新型建筑板材.本文叙述了石膏刨花板的特点和生产工艺; 介绍了芬兰、挪威等国石膏刨花板的生产现状, 论述了我国发展石膏刨花板的可能性和必要性, 并提出了几点建议. 相似文献
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芦苇-稻草原料球磨处理生产刨花板 总被引：2，自引：0，他引：2
选择芦苇和稻草为原料,以脲醛树脂为黏结剂制备了芦苇-稻草刨花板。在芦苇碎料中加入一定量的矿物材料,然后采用机械球磨进行处理,应用正交设计对施胶量、热压压力、碎料球磨处理3个因素对板材各项性能的影响进行了研究。实验结果表明,球磨处理可以明显改善芦苇／树脂的结合强度,提高刨花板的各项性能。在施胶量16％,热压压力3．4MPa,对碎料进行球磨处理后制板,除内结合力较低外,板的静曲强度、弹性模量和握钉力都可以达到GBT 4897．3-2003对在干燥状态下使用的家具及室内装修用板的性能要求。 相似文献
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水热处理对废弃刨花板的刨花形态及其再循环利用性能的影响 总被引：5，自引：2，他引：3
刨花形态和刨花板的再循环利用在再生刨花板的制造过程中具有重要作用。本文讨论了在备料前对废弃刨花板进行热处理的新工艺,分析了水热处理工艺对再生刨花的形态、吸水性及再胶合性能的影响。研究结果表明,采用水热处理工艺制备的再生刨花所压制的刨花板性能接近于原生刨花板;再生刨花有良好的再胶合性能。 相似文献
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A model is presented to determine the horizontal density distribution (HDD) and vertical density profile (VDP) of oriented strand board (OSB) panels produced by batch pressing. The HDD is simulated using input distributions of flake dimensions and orientation from plant measurements. Many previous HDD models rely on assumed distributions, which may not accurately characterize current manufacturing processes. The model predicts the VDP based on the compression behaviour of cellular materials in combination with temperature and moisture profiles calculated using a previously published heat and mass transport model. A novel empirical approach is applied rather than the time–temperature–moisture superposition method commonly used. The model predictions compare favourably with plant data and exhibit trends similar to previously reported experimental results. This work is the first of a two-part publication. The second part is concerned with stiffness property prediction and an optimization of the OSB manufacturing process. This work is novel in that no comprehensive model including HDD, VDP, stiffness property prediction and optimization has been reported in the literature. 相似文献