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杨雪慧刘学胡汉志廖桂福王红强廖传行 《中国人造板》2017,(8):34-37
内结合强度是衡量非单板类木质人造板加工使用性能的一个重要指标。本文针对中密度纤维板内结合强度项目开展的实验室间比对活动,利用h值检验法和经典统计法对比对结果进行了综合的分析与评价,并对中密度纤维板内结合强度测定方法的具体操作提出一些建议。 相似文献
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湿法中密度纤维板生产中长网成型的改进赵广群(辛集市纤维板厂)长网成型是湿法中密度纤维板生产中的一个重要环节,只有在成型时获得纤维交织良好,厚度均匀,表面平整的板坯,热压时才可获得强度好,表面质量优良的中密度纤维板。要想使成型时板坯厚度均匀和连续一致,... 相似文献
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通过正交试验探讨干燥进口温度、纤维绝干量和纤维形态对纤维板物理力学性能的影响,得出干燥工艺对纤维板力学性能有较大的影响,最优因素组合为:纤维绝干量25 t/h、干燥进口温度114 ℃,e纤维形态。其中干燥进口温度和纤维绝干量对板材静曲强度和弹性模量影响最大;内结合强度、24 h吸水厚度膨胀率受干燥进口温度、纤维绝干量、纤维形态因素的影响不大。在最优工艺下制备的中密度纤维板(4.5 mm厚)与GB/T 11718—2009《中密度纤维板》干燥状态下使用的普通型中密度纤维板理化性能对比得出:24小时吸水厚度膨胀率和甲醛释放量分别为30.3%和5.6 mg/100 g,分别减少了13.43%和30%,静曲强度达到46.5 MPa,提高了78.85%。 相似文献
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介绍了中密度纤维板产品进行甲醛释放量检测时,板材含水率、取样时间及所用仪器型号对检测结果的影响,建议修改和补充GB/T17657——1999《人造板及饰面人造板理化性能试验方法》。 相似文献
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分析比较了中密度纤维板试件在检测时所用万向节数量对表面结合强度测试结果的影响。经过试验,结果表明:使用万向节对表面结合强度的测试值有一定的影响,使用两个万向节的表面结合强度测试值比用一个和不用要大。 相似文献
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Bending strength of different wood-based panels such as particleboard, MDF and OSB has been studied at temperatures between +20°C and +140°C. It was found that the temperature for all studied panels significantly affects bending strength. After one-hour effect of the temperature 140° the bending strength of panels is reduced (in comparison to the temperature of 20°C) by 40% for particleboard, by 37% for MDF and by 30% for OSB. The results of the present study indicate that it is important to consider the temperature effects in application of wood-based panels. 相似文献
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Empirical correlations between test methods of measuring formaldehyde emission of plywood, particleboard and medium density fiberboard 总被引:1,自引:0,他引:1
Byung-Dae Park Eun-Chang Kang Sang-Bum Park Jong Young Park 《Holz als Roh- und Werkstoff》2011,69(2):311-316
Since different test methods of measuring the formaldehyde emission (FE) from wood-based composite panels have been used for different countries and regions, this study attempted to establish empirical correlations between three test methods (i.e., 24-hour desiccator, 1 m3 chamber, and perforator) for plywood (PLW), particleboard (PB), and medium density fiberboard (MDF), particularly emphasizing on correlations between the 24-hour desiccator and the 1 m3 chamber method. The desiccator method found statistically high correlations with other two methods, resulting in regression coefficient values ranging from 0.96 to 0.88 for PLW, PB, and MDF samples. In particular, the desiccator method had an empirically high correlation with the 1 m3 chamber method that had been adopted as the reference method of comparing regionally different test methods of measuring the FE of wood-based composite panels by the ISO/TC89. 相似文献
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Bending strength of different wood-based panels such as particleboard, MDF and OSB has been studied at temperatures between +20°C and +140°C. It was found that the temperature for all studied panels significantly affects bending strength. After one-hour effect of the temperature 140° the bending strength of panels is reduced (in comparison to the temperature of 20°C) by 40% for particleboard, by 37% for MDF and by 30% for OSB. The results of the present study indicate that it is important to consider the temperature effects in application of wood-based panels.
Kurzzeit-Einfluß der Temperatur auf die Biegefestigkeit von Holzwerkstoffplatten
Zusammenfassung Die Biegefestigkeit verschiedener Holzwerkstoffplatten wie Spanplatten MDF und OSB wurden bei Temperaturen zwischen 20°C und 140°C untersucht. In allen Fällen hatte die Temperatur einen signifikanten Einfluß auf die Biegefestigkeit. Nach einer Stunde bei 140°C war die Festigkeit der Spanplatten um 40%, MDF um 37% und OSB um 30% reduziert (verglichen mit Werten bei 20%). Solche Temperatureffekte sollten künftig bei der Anwendung von Holzwerkstoffen berücksichtigt werden.相似文献
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人造板的弹性模量不同于理想弹性体,它依赖于应变和时间,与含水率也有关系。用拉仲和弯曲方法测定弹性模量得到的结果不同,用小试件和大板测定弹性模量得到的结果也不一致。目前非破坏性测定弹性模量的方法尚难以取代产品标准中破坏性的测定力学性能的方法。 相似文献
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Mechanical and physical properties of agro-based fiberboard 总被引:1,自引:0,他引:1
In order to better utilize agricultural fibers as an alternative resource for composite panels, several variables were investigated to improve mechanical and physical properties of agro-based fiberboard. This study focused on the effect of fiber morphology, slenderness ratios (L/D), and fiber mixing combinations on panel properties. The panel construction types were also investigated such as hardboard (HB), medium density fiberboard (MDF), and bagasse core panel (BCP) made from bagasse/bamboo combinations with a combination of 1% pMDI/4% UF as a binder. Static bending properties and tensile strength increased as fiber L/D increased from 3 to 26. Fiber separation and morphology also influenced the mechanical property development of agro-based panels. Bagasse fiber bundles and particles smaller than L/D of 5.4 were responsible for the mechanical property loss of agro-based MDF. The BCP yielded promising results for modulus of elasticity (MOE) and modulus of rupture (MOR). However, HB appeared to be a better panel type for agro-based composites based on the property enhancement compared to wood-based panel products. 相似文献
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人造板无损检测是一项综合性科学技术,可以在不破坏人造板的前提下,对其物理力学性能和内部缺陷进行快速有效的检测。本文对国内外人造板无损检测技术的研究现状进行了总结,并对小波分析方法在人造板无损检测中的应用进行了展望。 相似文献