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

研究机筒温度控制对单螺杆挤出机工艺行为的影响并设计实用的机筒温度控制

• 批准号: 282084275
• 负责人: Professor Dr.-Ing. Volker Schöppner
• 金额: --
• 依托单位: Fachgebiet Kunststoffverarbeitung
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2015
• 资助国家: 德国
• 起止时间: 2014-12-31 至 2018-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/282084275?language=en
• 关键词: Investigation; influence; cylinder; temperature; control

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.

以过程为导向的行为，从而选择性地影响螺杆机在选择气缸温度曲线上的行为，通常需要对过程的高度理解和大量的产品加工经验。在此，温度曲线的选择对于待加工产品的后续质量非常重要，并且还对系统的效率具有影响。各种研究项目已经证明，气缸温度曲线对相应过程的特定适应性导致在其他相同的过程条件下输出速率的增加。此外，在能量方面存在很大的改进潜力，因为错误选择的温度曲线可能导致工艺中更差的熔化性能，并且引入的能量通常不得不再次被移除而不被冷却单元使用。如果在加工中使用规则变化的工艺参数、不同的材料和螺杆几何形状，则该问题减少，从而需要温度控制的连续适应。本研究项目的目的是在气缸温度控制领域进行调查，在此过程中识别影响和控制变量，从中可以确定优化策略并将其转化为适当的温度控制。待确定的控制系统被假定为一个独立的专家系统，它可以添加从以前的过程点的实践和实验模型的法律代码。整个系统的控制工艺映射应通过在模型层次上对挤出过程进行抽象来完成。通过划分为子过程和相互考虑的子过程与彼此，热，流变和致动器为基础的过程之间的反应可以建模。此外，传热效应，这也发生在螺杆和机筒区域的传导和相互通过对流与熔体，将被认为是与已经开发的模型相结合的描述在螺杆机的温度分布。这将最终导致挤出过程的更好的可预测性。在项目结束时，温度控制系统的实施应位于现有的挤出系统中，计划进行大量研究以验证上述模型方法。