Thermal optimisation of polymer extrusion using in-process monitoring techniques
Thermal optimisation of polymer extrusion using in-process monitoring techniques
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DOI：
10.1016/j.applthermaleng.2012.04.013
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发表时间：
2013-05-02
影响因子：
6.4
通讯作者：
Deng, Jing
中科院分区：
文献类型：
--
作者：
Vera-Sorroche, Javier;Kelly, Adrian;Deng, Jing
聚合物挤出是一种能源密集型工艺，通常在低于最佳条件下运行。挤出过程包括通过旋转螺杆和机筒之间的热传导和粘性剪切使固体聚合物逐渐熔融；因此，它高度依赖于聚合物的摩擦、热和流变性能。理想情况下，挤出机螺杆的几何形状和挤出变量应根据各个聚合物的特性进行定制，但在实践中，由于缺乏对工艺的了解，这一点很少实现。在这里，过程中监测技术已被用来表征挤出过程的热动力学。新型热电偶网格传感器已用于测量挤出机模具入口处流动聚合物熔体内的熔体温度场，并结合红外温度计和实时量化能耗。在不同的挤出操作条件下，使用三种挤出机螺杆几何形状对商业级聚乙烯进行了检查，以了解工艺效率。研究发现，挤出机螺杆的几何形状、螺杆转速和设定温度对熔体的热均匀性和工艺能耗有显着影响。 (C) 2012 Elsevier Ltd. 保留所有权利。
Polymer extrusion is an energy intensive process, which is often run at less than optimal conditions. The extrusion process consists of gradual melting of solid polymer by thermal conduction and viscous shearing between a rotating screw and a barrel; as such it is highly dependent upon the frictional, thermal and rheological properties of the polymer. Extruder screw geometry and extrusion variables should ideally be tailored to suit the properties of individual polymers, but in practice this is rarely achieved due to the lack of understanding of the process. Here, in-process monitoring techniques have been used to characterise the thermal dynamics of the extrusion process. Novel thermocouple grid sensors have been used to measure melt temperature fields within flowing polymer melts at the entrance to an extruder die in conjunction with infra-red thermometers and real-time quantification of energy consumption. A commercial grade of polyethylene has been examined using three extruder screw geometries at different extrusion operating conditions to understand the process efficiency. Extruder screw geometry, screw rotation speed and set temperature were found to have a significant effect on the thermal homogeneity of the melt and process energy consumed. (C) 2012 Elsevier Ltd. All rights reserved.