Determination of the correlation between pressure fluctuations, thickness fluctuations, melting degree and product quality in extrusion

单螺杆挤出是塑料加工的核心能力之一。在经济条件的背景下，在保持高熔体质量的同时提高加工设备的生产能力是许多机械制造商的主要发展目标之一。这需要有目的的螺丝设计。在预期的研究方案中，将使用挤出管材型材来研究加工参数与熔体和产品质量之间的相关性。目的是确定挤出机出口处的熔体质量不再足以挤出高质量产品的质量极限。这一质量极限主要应考虑为挤出机中熔融过程结束位置的函数，但也要考虑其他影响因素。在初步调查中，有必要确定重要和不相关的影响因素，以便根据结果选择要调查的因素。此外，还考虑了各种常见挤出机螺杆的影响。然后对所选择的影响因素进行了系统的研究，并用相应的工艺参数对实验研究进行了分析模拟，并根据实验生成的数据对模拟进行了验证。这些模拟可以深入了解挤出机中的过程，如确定熔融过程的结束位置。研究的目的是开发一个模型，该模型基于工艺参数和可分析应用的模拟，允许预测挤出机出口处的预期熔体质量。其目的是为螺杆设计过程提供一种工具，该工具可以快速且经济有效地检查待设计螺杆上的要求。

Single-screw extrusion is one of the core competencies of plastics processing. Against the background of economic conditions, increasing the throughput of processing machines while maintaining a high melt quality is one of the primary development goals of many machine manufacturers. This requires a purposeful screw design. In the intended research proposal, the correlation between the processing parameters and the melt and product quality is to be investigated using an extruded pipe profile. The aim is to identify a quality limit above which the melt quality at the extruder outlet is no longer sufficient to allow the extrusion of a high-quality product. This quality limit is to be considered mainly as a function of the location of the end of the melting process in the extruder, but other influence factors are also to be considered.In the preliminary investigations it is necessary to identify both important and non-relevant influencing factors in order to create a selection of the factors to be investigated on the basis of the results. In addition, the influence of various common extruder screws is considered. The selected influencing factors are then investigated systematically and to the required extent.The experimental investigations are analytically simulated with the corresponding process parameters and the simulations are validated on the basis of the experimentally generated data. The simulations allow an insight into the processes in the extruder, such as determining the location of the end of the melting process.The aim of the investigations is to develop a model which, based on the processing parameters and analytically applicable simulations, allows a prediction of the expected melt quality at the extruder outlet. The aim is to provide a tool for the screw design process which can quickly and cost-effectively check the requirements placed on the screw to be designed.