Investigation of the influence of the cylinder temperature control on the process behavior of single-screw extruders and design of a practical cylinder temperature control

以过程为导向的行为，从而选择性地影响螺杆机的行为对缸体温度分布的选择，往往需要对过程有很高的了解，并在产品加工方面有丰富的经验。在这里，温度分布的选择对于待加工产品的后续质量非常重要，也影响到系统的效率。各种研究项目已经证明，在其他相同的工艺条件下，对钢瓶温度分布进行特定的调整以适应相应的工艺，可以提高产量。此外，在能量方面有很大的改进潜力，因为错误地选择温度分布可能会导致过程中较差的熔化性能，并且引入的能量经常不得不被再次去除而不使用冷却单元。如果在加工过程中使用不同的材料和螺杆几何形状，如果定期改变工艺参数，问题就会减少，因此需要不断地调整温度控制。本研究项目的目的应该是在气缸温度控制领域进行研究，在这个过程中识别影响和控制变量，从中确定优化策略，并将其转化为适当的温度控制。待定控制系统被假定为一个独立的专家系统，可以添加来自先前过程点的实践规范和实验模型律。整个系统的控制技术映射应该通过抽象模型级的挤出过程来完成。通过将子过程划分为子过程并相互考虑子过程，可以对热过程、流变性过程和基于执行器的过程之间的反应进行建模。此外，还将考虑螺杆和筒体区域内的传导以及与熔体的对流相互作用所产生的热传递效应，并将其与已开发的描述螺杆机内温度分布的模型相结合。这最终将导致挤出过程的更好的可预测性。在项目结束时，应在现有的挤压系统中实施温度控制系统，并计划对该系统进行大量研究，以验证上述模型方法的有效性。

The process-oriented behavior and thus selectively influencing the behavior of screw machines on the choice of cylinder temperature profile often requires a high understanding of the process and a great deal of experience in product processing. Here, the choice of the temperature profile is of great importance for the later quality of the product to be processed and also has impact on the efficiency of the system. Various research projects have already been proven that specific adaptation of the cylinder temperature profile to the respective process lead to an increase in output rates with otherwise the same process conditions. In addition, there is a great potential in the improvement in terms of energy, because a wrong chosen temperature profile may lead to worse melting performances in the process and the energy introduced often has to be removed again unused with cooling units. The problem declines, if regularly varying process parameters, different materials and screw geometries are used in the processing, so that a continuous adaptation of the temperature control is required. The aim of this research project should be to conduct investigations in the field of cylinder temperature control, with influence and control variables are to be identified in the process, from which derive optimization strategies can be determined and transformed in an appropriate temperature control. The to be determined control system is assumed to be an independent expert system, which can be added with codes of practice and experimental model laws from the previous process points. The control technology mapping of the entire system should be done by the abstraction of the extrusion process framed in a model level. By dividing into sub-processes and mutual consideration of sub-processes with each other, the reaction between thermal, rheological and actuator-based processes can be modelled. In addition, heat transfer effects, which also take place by conduction in the screw and barrel areas and mutually by convection with the melt, will be considered and by that combined with the already developed models for the description of the temperature profiles in screw machines. This will lead ultimately to a better predictability of extrusion processes. At the end of the project, the implementation of the temperature control system should be located in an existing extrusion system, to which numerous studies validating the mentioned model approaches are planned.