共查询到20条相似文献,搜索用时 156 毫秒
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采用软测量技术对PVC沸腾床干燥过程进行智能控制改造。以风量、床温、热水温度、进料量等参数为辅助变量,通过主元分析,基于线性回归方法对干燥床温度、风量和PVC树脂水含量进行建模,实现了PVC树脂水含量的在线实时模拟测量。 相似文献
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通过比较PVC生产中旋风干燥和旋流干燥两种PVC浆料干燥工艺,指出旋风干燥工艺具有设备少、易操作的优点,并介绍了干燥系统中旋振筛、空气加热器等设备的改进情况. 相似文献
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介绍了与粉体流动性有关的理论,分析了PVC树脂、CPE、碳酸钙和冷混工艺对PVC干混料粉体流动性的影响,结果表明:①乙烯法PVC树脂的粉体流动性一般优于电石法PVC树脂,且波动较小;②某些厂家的冲击改性剂CPE可改善PVC干混料的粉体流动性,并且随着CPE用量的增加,PVC干混料的粉体流动性增加;③不同生产厂家的PVC/CPE体系对PVC干混料粉体流动性的影响规律不同,应不断摸索,找出最佳组合;④随着碳酸钙用量的增加,PVC干混料的粉体流动性降低,特别是在料斗上的表现更为突出;⑤充分冷却后的PVC干混料粉体流动性较好。 相似文献
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Maurice E. Wheeler 《乙烯基与添加剂工艺杂志》1980,2(4):212-217
The time for a PVC resin to dry blend or to become a free flowing mix, when blended with a plasticizer in an elevated processing mode, is a common concern for manufacturers of flexible PVC products. The limiting factor in some processes is the dry blending cycle time. Longer dry blending times increase manpower and energy cost per mixer batch. Each flexible PVC compounder has some type of quality control test he uses to assess a resin's dry-up properties. This paper examines the relationship of resin particles and plasticizer during dry-up testing of intermediate to high molecular weight PVC resins. Through this examination, a better understanding of the factors that control dry-up times was achieved. Also included is a comparison of quality control dry-up times and mix cycle times in production size mixers. 相似文献
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Although thermoplastic extrusion and injection molding have been extensively studied by a large number of authors, very little is known about the correlations between the extrusion and injection molding process variables. This paper describes the various comparable process variables between extrusion and injection molding of PVC dry blends. The Brabender extruder of 19 mm diameter and 25:1 length to diameter ratio and the Szekeley reciprocating single screw injection molding machine were used. PVC dry blends of industrial importance were prepared using a high speed mixer. The four mix formulations based on a commercial grade of PVC were used. Process variables studied during the injection molding were the melt temperature near the nozzle, injection pressure, injection speed, and energy consumption. Process variables studied during extrusion were the melt pressure at the die, power consumption, and the melt temperature at the die orifice. The correlations between the extrusion and injection molding process variables for PVC dry blends have been established. 相似文献
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未增塑聚氯乙烯(UPVC)配方拟定后,高速混合机的加料量、加料顺序、混合温度和混合耐间等因素,都会对聚氯乙烯(PVC)干混料的质量和产量有重要影响,这里仅从几个工艺控制点来分析影响的因素、程度及解决方案。 相似文献
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电石渣是乙炔法生产聚氯乙烯产生的废渣,利用电石渣生产水泥熟料是电石渣综合利用中用量最大、最彻底、技术最成熟的方法。实现资源综合利用工艺方案发展循环经济。分析了国内各种利用电石渣生产水泥熟料工艺的特点,认为选择新型干法预烘干干磨干烧工艺是最具发展前途的工艺。 相似文献
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简述了管件专用聚氯乙烯树脂在上海天原化工有限公司的30m^3聚合釜的生产情况,对生产中的配方和工艺进行了调整和优化,生产出聚合度为700的管件专用聚氯乙烯树脂的干流动性和流变性能接近日本信越TK-700聚氯乙烯树脂的实测水平。 相似文献
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结合PVC下游加工企业对产品质量的要求,对聚氯乙烯生产过程中出现的质量问题进行了原因分析,并提出了解决办法,使PVC产品质量得以有效提高,最大限度满足用户的需求。 相似文献