共查询到19条相似文献,搜索用时 109 毫秒
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《工程塑料应用》2001,29(3):26
部分新型建材产品需求量预测如下: 防水密封材料 2000年,全国新型防水卷材产量达到8 300万m2,市场占有率达到20%,全国城镇永久性建筑采用新型防水材料达到60%。到2010年,全国新型防水卷材产量将达到2.5亿m2,市场占有率达到50%,城镇永久性建筑采用新型防水材料将达到80%。 塑料异型材和门窗 2000年,全国塑料异型材需求量为20万t,可组成1 000万m2塑料门窗。预计到2010年,全国塑料异型材需求量为50万~60万t,可组成塑料门窗2500万~3000万m2。 塑料地板 2000年,全国塑料地板需求量为8 000万m2。预计到2010年,全国塑料地板需求量将达到1.5亿~2亿m2。届时,各种塑料地板(包括弹性卷材地板)和各种功能地板(抗静电、防腐蚀、防火、保健)的品种、档次将有显著的提高,可基本满足不同层次的需求。 塑料管材 2000年,全国塑料管材需求量为40万t,塑料管材与管件不配套问题基本解决。预计到2010年,全国塑料管材需求量将达到100万t,其品种包括塑料给水管、电线导管、冷热水管、燃气管等。(建材) 相似文献
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塑料建材产品2000年需求情况及2010年需求预测如下:(1)塑料异型材和门窗2000年,全国塑料异型材需求量为20万t,可组成1 000万m2塑料门窗.预计到2010年,全国塑料异型材料需求量为50~60万t,可组成塑料门窗2500~3000万m2.(2)塑料地板2000年,全国塑料地板需求量为8000m2.预计到2010年,全国塑料地板需求量将达到1.5~2亿m2.届时,各地塑料地板(包括弹性卷材地板)和各种功能地板(抗静电、防腐蚀、保健)的品种、档次将有显著的提高,可基本满足不同层次的需求.(3)塑料管道2000年,全国塑料管道需求量为40万t(其中33万t为排水管、7万t为给水管),塑料管材与管件不配套问题基本可解决.预计到2010年,全国塑料管材需求量将达到100万t,其中包括塑料给水管、电线导管、冷热水管、燃气管等. 相似文献
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郑宁 《合成材料老化与应用》2006,35(3):58
扬子石化公司利用自主研究开发的新型催化剂,通过中试装置的聚合工艺研究,开发出一种新型交联高密度聚乙烯管材专用料。该专用料综合性能十分优异,是高附加值的新产品。用交联高密度聚乙烯管材专用料生产的塑料管材具有耐热、耐低温、柔韧性好、使用方便、使用寿命长等特点,非常适合于地板辐射采暖。 相似文献
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采用可控升降温电炉测定Sn-Bi金属的步冷曲线,得出Sn-Bi金属的相变温度。对样品的质量,冷却风量、测试区温度、样品混合方式进行了研究,结果表明:增大样品的质量,提高测试区温度,搅拌样品能使步冷曲线的折点明显、平台水平。采用样品管盖上带的搅拌杆搅拌120 g的样品在室温下自然降温,样品混合均匀。 相似文献
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A theoretical and experimental study of heat transfer to polymer melts flowing through circular tubes is presented. The mathematical model provides for shear heating and expansion cooling effects, and also heat of reaction during flow for various wall boundary conditions. Experimental results, obtained using low density polyethylene, show reproducible temperature and velocity profiles. The measured inlet melt temperature profile and the axial wall temperature profile provide the boundary conditions for the calculations. The experimental data confirm the predictions of the magnitude of the shear heating and expansion cooling effects during tube flow. 相似文献
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Antonio Pedro Novaes de Oliveira Enrique Sánchez Vilches Vicente Cantavella Soler Francisco A. Gilabert Villegas 《Journal of the European Ceramic Society》2012,32(11):2853-2858
A focused research was conducted on samples prepared from an industrial porcelain tile composition containing quartz, used to produce ceramic floor tiles, with the aim of evaluating the variation of fired specimens’ Young's modulus with temperature. These samples were fired in controlled laboratory conditions so that specimens with pre-existing cracks were obtained and subject to non-destructive in situ thermo-mechanical measurements (impulse excitation technique) in the 22–700 °C temperature range during heating and cooling processes in order to find evidences to explain the hysteresis phenomenon in the Young's modulus versus temperature curve. The observed irreversible Young's modulus may be directly related to the pre-existent cracks that on heating and cooling are closed and opened up respectively, changing thus the Young's modulus which is well characterized by a hysteresis cycle. 相似文献
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《Journal of aerosol science》2002,33(7):1087-1093
Separated measurements of volatile and non-volatile fractions of atmospheric aerosols have become more important due to possible effects of non-volatile particle on respiratory diseases. Measurements of non-volatile particle fractions with considerable size and time resolution are therefore needed. The combination of a thermodenuder (TD) with aerosol size spectrometers can provide size distributions of non-volatile particles. TDs usually consist of two units: a heating and a cooling tube. Unfortunately, available TDs have some disadvantages concerning the heated tube, where volatile material should be desorbed from the particles. The residence time in the heating zone might be too short to completely evaporate the volatile material or the temperature at the exit of the heating tube might be below the condensation temperature of the evaporated species. Here, a new TD was developed with a longer residence time at the requested temperature and a more effective insulation to prevent recondensation at the end of the heating unit. Additionally, the TD was calibrated for size-dependent particle losses at different heater temperatures. 相似文献
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Timothy J. Rennie Vijaya G.S. Raghavan 《Chemical Engineering and Processing: Process Intensification》2010
A numerical study of a double-pipe helical heat exchanger was performed to ascertain the residence time, temperature, and processing uniformity for food processing applications. A range of laminar flow rates were used, with both parallel flow and counterflow configurations. Both heating and cooling in the inner tube were studied. Heating/cooling uniformity was estimated by using a first-order kinetics model for sterilization. Process uniformity is important in the quest for high quality product and this report is a first study for the uniformity in double-pipe helical heat exchangers. 相似文献
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变径毛细管是一种用于家用热泵的低成本节流装置,其非对称结构可以实现正反两个流向的流量不同,从而可以满足热泵系统制冷和制热所需的流量。为了实现变径毛细管工程设计,开发了变径毛细管流量的关联式。通过构建变径毛细管等效管径和等效管长计算公式并代入等径毛细管关联式,得到了变径毛细管流量的关联式的公式形式;通过数值计算模型产生用于拟合关联式系数的数据源。开发的变径毛细管流量关联式可计算变径毛细管正向和反向的制冷剂流量以及传统的等径毛细管的流量。开发关联式能很好地预测变径毛细管在不同工况下制冷剂流量的变化趋势,预测93%实验数据点的精度在10%以内。 相似文献