Modeling of mixing process of the polymer composition in the dynamic mixer of the worm extruder

Volodymyr Sivetskyi, O. Sokolskyi, Oleksiy Malchevskyi
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Abstract

Mixing processes play an important role in the processing of polymer materials, because the quality of the mixing of the polymer material depends on its level of homogeneity, which in turn affects the quality of the final product. It is another matter when the polymer material consists of two or more components, in this case, the issue of the process of obtaining a homogeneous polymer composition becomes extremely acute. In order to improve the quality of the final product and justify the design and technological parameters of the mixing zone, it is necessary to investigate the regularity of the quality of mixing in a dynamic mixer of the CTM worm extruder type. According to existing works on determining the quality of mixing of polymeric material, the difference in concentrations of one of the components in different cross-sections along the length of the channel can be used as a criterion for homogeneity of mixing. Numerical modeling of the process of mixing the polymer composition in the dynamic mixer installed in the dosing zone of the worm extruder, which is equipped with an additional injection device that supplies the additional component to the dynamic mixing zone through the injection channel located in the body of the worm extruder, was carried out. Calculations were carried out on the basis of the finite element method (FEM) using the ANSYS software complex. A mathematical model of the process of mixing the polymer composition in a dynamic mixer of the CTM type of a worm extruder with the addition of an additional component, which is identical in density and viscosity to the main polymer material and can differ only in a certain feature that does not affect the properties of the components, such as color, has been developed. Moreover, the properties were set in such a way that the temperature distribution of the mixture was completely determined by the convective component, that is, it resulted only from the conditions of the mechanical movement of the volumes of the components. The dependence of the homogeneity of the polymer composition as a result of mixing on the technological and design parameters of the dynamic mixer of the CTM type was obtained. The research was carried out at different speeds of rotation of the mixer rotor and at different speeds of supplying the additional component. The movement of the components of the mixture was determined by their flow rate at the entrance to the main channel and at the entrance to the additional injection channel. The most optimal technical characteristics were selected in order to achieve the best level of uniformity.
蜗杆挤出机动态混合器中聚合物组合物混合过程的建模
混合过程在聚合物材料的加工中起着重要的作用,因为聚合物材料的混合质量取决于其均匀性水平,而均匀性又影响最终产品的质量。当聚合物材料由两种或两种以上组分组成时,则是另一回事,在这种情况下,获得均相聚合物组合物的过程问题变得非常尖锐。为了提高最终产品的质量,合理设计和工艺参数,有必要研究CTM蜗杆挤出型动态混合器的混合质量规律。根据现有的测定高分子材料混合质量的工作,其中一种组分在不同截面上沿通道长度的浓度差异可以作为混合均匀性的判据。对安装在蜗杆挤出机加药区的动态混合器内聚合物组合物的混合过程进行了数值模拟。蜗杆挤出机加药区设有附加注射装置,通过蜗杆挤出机本体的注射通道将附加组分提供给动态混合区。基于有限元法,利用ANSYS软件进行计算。建立了在CTM型蜗杆挤出机的动态混合器中混合聚合物组合物过程的数学模型,该过程添加了与主聚合物材料在密度和粘度上相同的附加组分,并且只能在不影响组分性质(如颜色)的某些特征上有所不同。此外,这些性质是这样设定的,即混合物的温度分布完全由对流成分决定,也就是说,它仅由成分体积的机械运动条件产生。得到了混合后聚合物组成的均匀性与CTM型动态混合器的工艺参数和设计参数的关系。在混合机转子的不同转速和提供附加元件的不同转速下进行了研究。混合气组分的运动由它们在主通道入口和附加注射通道入口的流速决定。为了达到最佳的均匀性水平,选择了最优的技术特性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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