共查询到19条相似文献，搜索用时 250 毫秒
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以废旧建筑模板和家具为原料,使用环保型无机胶黏剂制备刨花板。利用扫描电子显微镜(SEM)观察刨花板的微观形貌,同时利用量热仪、氧指数测定仪、同步热分析仪等评价板材的阻燃性及热稳定性。结果表明:当板材密度为0.95g/cm^3时,除24h吸水厚度膨胀率外,其余物理力学性能均符合国标中的P3型刨花板要求;SEM观察到无机胶黏剂包覆刨花,填充板材孔隙,使板材物理力学强度大幅提高;选择氯化镁为固化剂,当表层/芯层刨花的固化剂用量为4.5%/5.0%时,压制的密度为0.95g/cm^3的刨花板,其氧指数为31%,具有较好阻燃性能。 相似文献
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正在2018年上海国际家具生产设备及木工机械展览会上,人造板行业世界领先企业——德国迪芬巴赫公司推出多项新技术和新装备以及人造板行业自动管理系统,吸引观展者的极大兴趣。1)超强刨花板制造技术:通过添加改进的超大扁平芯层刨花,从而使板材密度比传统刨花板降低30 kg/m3。保证板材物理力学性能的基础上,大幅节约原料和能耗,为用户带来的更高的经济效益。2)细表面定向结构刨花板制造技术:通过在定向结构刨花板(OSB)表层再铺装细小刨花,使OSB 相似文献
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《林业工程学报》2016,(5)
针对现有空心刨花板纵向强度低,对刨花要求高和需脱膜等缺陷,以不同板材厚度、空心孔距和芯层比例(芯层刨花质量比)作为影响因素,采用预埋PVC管平压成型的方式制造空心刨花板,对板材主要物理力学性能进行测试和分析。研究表明:采用预埋PVC管进行平压式空心刨花板制造是可行的,对板材性能有较大的增强作用。相同密度下厚度为16 mm的板材力学性能最好,芯层所占比例为2/3时,PVC管孔截面变形最小,空心孔距对板材力学性能影响不显著。板材的24 h吸水膨胀率(TS)随着厚度的增大呈下降趋势,力学性能随着厚度的增大而先下降后上升。当厚度为16 mm时,板材静曲强度(MOR)达到12.66 MPa,弹性模量(MOE)达到1.444 GPa,而24 h TS达到11.80%。板材的MOR和MOE随空心孔距的增大呈先下降后上升的变化趋势,对24h TS无明显影响,当空心孔距为20 mm时,板材的MOR达到12.47 MPa、MOE达到1.336 GPa、而24 h TS达到11.62%。板材的MOR和MOE随芯层比例的增大呈先下降后上升的变化趋势,对24 h TS无明显影响,当芯层比例为2/3时,板材的MOR达到12.04 MPa,MOE达到1.302 GPa,而24 h TS达到了10.68%。 相似文献
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改性UF麦秸均质刨花板的工艺研究 总被引：1，自引：1，他引：1
通过试验确定了麦秸均质刨花板的主要工艺参数。其结果表明：１０ｍｍ厚麦秸均质刨花板的较优工艺参数为热压温度１５０℃、热压时间８ｍｉｎ、表层麦秸刨花的施胶量为１０％、芯层麦秸刨花的施胶量为８％、板密度０．７５ｇ／ｃｍ３、表芯层刨花比例为３：７。按照以上工艺条件压制的麦秸均质刨花板性能已达到均质刨花板的要求。 相似文献
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利用半纤维素酶/漆酶协同处理3种不同类型的竹刨花,热压制备竹材自生胶合刨花板,研究不同刨花形态对刨花板物理力学性能的影响.结果表明:刨花形态对竹材自生胶合刨花板主要物理力学性能有显著影响,3种刨花形态中,4～16目的细刨花性能最佳,16目以上碎刨花作为填料加到大刨花中有利于提高刨花板弹性模量,减小吸水厚度膨胀率.该结论为进一步研究刨花形态与竹材自生胶合刨花板物理力学性能的关系提供了理论基础. 相似文献
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热压工艺对定向刨花-单板复合集装箱底板性能的影响 总被引：1，自引：0，他引：1
采用不同的施胶量、热压压力、热压时间,研究定向刨花(Oriented Strand)作芯层、单板作面层的一次热压复合制造集装箱底板的热压工艺,以及底板的密度与力学性能之间的关系。结果表明:(1)当刨花的施胶量(MDI)为8%时,在与刨花接触的单板上不涂胶、涂MDI及涂WD型酚醛胶,对整块板的静曲强度的差异不大;(2)WD型PF胶适合作为一次复合热压工艺的单板间用胶黏剂;(3)延长卸压时间,可以减小板的回弹,理想的热压时间为27min;(4)复合集装箱底板的芯层密度对底板的静曲强度起决定性作用,当芯层密度低时,其破坏形式均表现为剪切破坏;(5)按3-D工艺压出的板的力学性能超过传统的克隆集装箱胶合板底板,可以作为集装箱底板使用。 相似文献
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从胶水类型、施胶方法以及关键工艺参数等方面探讨了竹木复合刨花板的生产工艺,综合结果表明,竹木复合刨花板批量生产的工艺参数为:低摩尔比环保树脂胶、搅拌气流式喷胶法、竹刨花比例40%～60%、用胶量70 kg(干胶)·m-3、热压压力2.0 MPa、热压温度170℃、热压时间20 s·mm-1、刨花颗粒(芯层)0.5～1.0 mm、板厚8.8 mm。生产的竹木复合刨花板产品质量执行国家标准,质量可以达到国标A类刨花板一等品标准。 相似文献
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YU Huaqiang ZHAO Rongjun FU Feng FEI Benhua JIANG Zehui Research Institute of Wood Industry Chinese Academy of Forestry Beijing P.R.China 《中国林业科技(英文版)》2007,6(2):14-19
The visible and near infrared （NIR） （350-2500 nm） spectra and the MOE of 438 small clear wood samples from Chinese fir, eucalyptus and poplar 72 were measured. Using partial least-square （PLS） modeling, the NIR spectra could be used to predict MOE and MOR of the clear-wood samples from Chinese fir and eucalyptus solid wood. NIR spectra could only be used to Predict MOE but not MOR of poplar clear-wood samples. With the exception of MoR of poplar clear-wood samples, the correlations between NIR and the mechanical properties are very strong, and the calibration and test correlation coefficients are both above 0.80. 相似文献
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人工林杉木和杨树木材物理力学性质的株内变异研究 总被引：4，自引：0，他引：4
按照中国国家标准研究杉木和I-214杨树木材的抗弯弹性模量、抗弯强度、顺纹抗压强度和密度,同时按照日本国家标准研究2个树种的顺纹抗剪强度.结果表明:杉木的抗弯强度、顺纹抗压强度和密度由胸高直径处向上呈波浪形增加,抗弯弹性模量则稳定降低,但不同高度间杉木的物理力学性质没有显著差异;近树皮处木材的物理力学性质高于近髓心处木材,并有极显著差异.对于I-214杨树,只有抗弯弹性模量从髓心到树皮逐渐增加,其他的物理力学性质,最小值在从髓心到树皮的过渡区,最大值在近树皮处,从髓心到树皮,杨树的物理力学性质有极显著的差异.杉木和杨树的径面顺纹抗剪强度从髓心到树皮有极显著差异,并且近树皮的高于近髓心的木材,而弦面顺纹抗剪强度从髓心到树皮没有显著差异.木材密度与力学性质有很好的线性相关关系,木材密度是一个很好的力学强度的预测手段. 相似文献
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Seyedeh Masoumeh Hafezi Kazem Doosthoseini 《林业研究》2014,25(3):667-670
We used silane coupling agents to improve the bonding ability between wheat straw particles and UF resin, and investigated surface properties （wettability and surface roughness） and hardness of parti-cleboard made from UF-bonded wheat straw （Triticum aestivum L.） combined with poplar wood as affected by silane coupling agent content and straw/poplar wood particle ratios. We manufactured one-layered particleboard panels at four different ratios of straw to poplar wood par-ticles （0%, 15%, 30% and 45% wheat straw） and silane coupling agent content at three levels of 0, 5% and 10%. Roughness measurements, average roughness （Ra）, mean peak-to-valley height （Rz）, and root mean square roughness （Rq） were measured on unsanded samples by using a fine stylus tracing technique. We obtained contact angle measurements by using a goniometer connected to a digital camera and computer sys-tem. Boards containing greater amounts of poplar particles had superior hardness compared to control samples and had lower wettability. Panels made with higher amounts of silane had lower Rq values. 相似文献
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利用杨树人工林剩余物生产刨花板可行性研究 总被引：1，自引：0，他引：1
The composite board industry in Iran is obliged to use residues from forest operation as well as wood industry for competing
with paper industry because of shortage of wood. In the present study we investigated the residues from poplar plantation
used for particleboard production. Three kinds of wood materials, poplar branches, small diameter poplar wood (3–8 cm) and
beech wood, were used in the experiment of particleboard production. The results demonstrated that the characteristic of particleboard
made from poplar branches and small diameter wood is comparable to that made from mature beech wood. To avoid too much residual
acid in the final board, the properties of boards produced with 1.5% hardener at 175°C press temperature are acceptable, although
the properties of particleboard produced with 2% hardener were higher than were higher than that of the board produced with
lower hardener (1% or 1.5%).. The MOR, MOE and IB of particleboard made from branches were measured as 14.57, 2015, and 1.32
MPa, respectively, while The MOR, MOE and IB of particleboard produced from small diameter poplar wood were 19.90, 2199, and
1.86 MPa, respectively. The thickness swelling of boards made from branches after 2 and 24 h immersion in water was 20.14%
and 31.26%. The utilization of branches and very small diameter wood of poplar is recommended for the survival and developments
of particleboard industry in Iran. 相似文献
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《Wood material science & engineering》2013,8(4):196-206
Abstract The present work was conducted to study the effects of wood species, particle size and residue particle size obtained from trimming of wood–cement composites on physical and mechanical properties of cement-bonded particleboard (CBPB). Particleboard was manufactured with a wood/cement ratio of 1:3 and specific gravity 1200 kg m?3. After manufacturing, the boards were tested. The second order plan was used to test the significant difference between factors and levels. It was shown that slenderness and compaction ratio increased and bulk density and specific surface decreased with the increase of particle size. With the increase in slenderness ratio and compaction ratio and decrease in bulk density and specific surface, thickness swelling and mechanical properties improved, but water absorption by the board increased. The addition of 6% of 5/3 fraction size of particle obtained from trimming of boards improved significantly the properties of the boards. The optimized panel properties, obtained using poplar particles with a fraction size of 7pass/on5, exceeded the BISON type HZ and EN Standard for Wood Particleboard. CBPB made of alder or poplar particles with 5/3 fraction size of residue exceeded the BISON type HZ. All CBPB with 5/3 fraction size of residue showed lower mean values of thickness swelling, well below the maximum requirements of both standards. In addition, wood species, fraction size of particles and residue size are believed to have been the main cause of change in the properties of the boards. 相似文献
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Morteza Nazerian Zahra Beygi Rahim Mohebbi Gargari Farhad Kool 《Wood material science & engineering》2018,13(2):73-80
High-quality wood resource scarcity as well as population growth and demand of wood have encouraged the use of alternative sources of lignocellulosic materials. In this study, the possibility of producing particleboard from waste cotton stalks is evaluated. The effects of the independent variables included weight ratio of melamine-formaldehyde to urea-formaldehyde, shelling ratio and the percentage of cotton stalks to poplar in the core layer were analyzed in the form of response surface methodology based on second-order multiple linear regression model. The results showed that there was perfect agreement between the estimated values and observed data, as with an increase in the ratio of melamine-formaldehyde resin to urea-formaldehyde, shelling ration and amount of poplar in the core layer of panels, modulus of rupture, modulus of elasticity and internal bonding increase. The optimal point of use of investigated variables included 18.30% melamine-formaldehyde, 30.35% thickness of the surface layers and 10.70% of poplar in the core layer. 相似文献
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柠檬桉水泥刨花板若干工艺因子的研究 总被引：2，自引：1，他引：2
通过对柠檬桉制造水泥刨花板的可能性、水泥/刨花的比率、水泥种类与板材性能关系等因素的研究,结果表明:使用添加剂或对木材进行热水处理可以使柠檬桉成为适宜制造水泥刨花板的树种。 相似文献