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首页> 外文期刊>Journal of Applied Polymer Science >Modeling of coat-hanger die under vibrational extrusion
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Modeling of coat-hanger die under vibrational extrusion

机译：振动挤压下衣架模具的建模

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The distributions of the pulsatile pressure field, the pulsatile velocity field, and the pulsatile resident time of the polymeric melt in the coat-hanger die are derived by using the pulsation of volumetric flow rate and pressure. Subsequently, formulae of the manifold radius and the slope of the manifold are deduced via volumetric flow rate pulsation. Polypropylene (PP) was employed for the experiments of the vibrational extrusion. The results indicate that the average extrusion pressure declines with frequency or amplitude decreasing; the distribution of residence time along the width of the coat-hanger die performs uniformly during the vibrational extrusion process; the theoretical extrusion pressure well agrees with the experimental pressure; the experiments of tensile test, impact test implicate that vibration improves the mechanical properties of products; differential scanning calorimetry testing demonstrates that the melting point of PP is moved to a higher temperature value, and the endothermic enthalpy and the crystallinity are improved as well when superimposing the vibrational force field. Accordingly, the model of the coat-hanger die under vibrational extrusion is well consistent with the experiments. (C) 2007 Wiley Periodicals, Inc.
机译：利用体积流量和压力的脉动推导聚合物熔体在衣架模中的脉动压力场，脉动速度场和脉动停留时间的分布。随后，通过体积流量脉动推导歧管半径和歧管斜率的公式。聚丙烯（PP）用于振动挤出实验。结果表明，平均挤压压力随频率或幅值的减小而减小。在振动挤压过程中，沿涂层衣架模具宽度方向的停留时间分布均匀。理论挤压压力与实验压力相吻合。拉伸试验，冲击试验表明，振动改善了产品的机械性能。差示扫描量热法测试表明，当叠加振动力场时，PP的熔点移至较高的温度值，吸热焓和结晶度也得到改善。因此，在振动挤压下的衣架模具的模型与实验非常吻合。 （C）2007 Wiley期刊公司

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