Inline-Characterization of Bead Foam Extrusion Processing

珠粒泡沫挤出加工的在线表征

• 批准号: 512399892
• 金额: --
• 依托单位: Universität Bayreuth
• 依托单位国家: 德国
• 项目类别: Major Research Instrumentation
• 财政年份: 2022
• 资助国家: 德国
• 起止时间: 2021-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/512399892?language=en
• 关键词: Inline; Characterization; Bead; Foam; Extrusion

Unlike the established representatives of expandable polystyrene (EPS) and expandedPolypropylene (EPP) most new bead foams are not produced by suspension or in an autoclave process, but continuously by means of foam extrusion coupled to anunderwater granulation. This makes it easier to add additives. Especially thechemical modification (e.g., CE = chain extender) is used in research and industry to increase the melt strength of technical thermoplastics, which is often too low for foaming. In addition to the flexibility, the many parameters also increase the complexity. Furthermore, during the melt processing with the CE reactive processes occur and thus constantly significant material property change. The control of certain final properties is similarly complex when large formulations or thermally sensitive materials are processed. A lot of data from the system and the periphery is already being captured for surveillance; a permanent, systematic recording and evaluation however, does not take place. Furthermore, certain values which are necessary for a scientific evaluation of the process are necessary, but sometimes are not at all or only partially recorded (e.g., melt viscosity, size distribution of the foamed beads). Both quantity and quality can also be increased with appropriate inline analytics.The add-on is necessary (i) to collect all scientifically and technically relevant data in real time and (ii) to evaluate this data - with suitable digital methods - already in real time during the running process. This includes in particular the properties of the final products. Ideally, previously unseen relationships between process and material parameters can be recognized (e.g., correlation of reactivity, rheology and expansion). In addition, a data basis can be created which allows self-optimization of the system through the use of activelearning or machine learning. Through modelling further impulses for understanding and forecasting the behavior of unknown materials are expected. The quality of the analysis is also improved, as becomes evident from the inline rheology is: here, process-relevant (higher) shear rates are measured compared with offline measurement (plate-plate) and the repeated melting during preparation and measurement is no longer necessary, what is critical especially in the case of chemically modified and thermally sensitive samples. The system concept exclusively contains components that allows a digital exchange andrecord and save previously missing measured variables. Material changes can be traced based on pressures, flow behavior and particle sizes (distribution) and process influences. Therefor, an inline rheometer, additional pressure sensors, a particle analyzer and suitable digital peripherals are required.

与已建立的可扩展聚苯乙烯（EPS）和扩展的丙烯（EPP）的代表不同，大多数新的珠泡沫不是由悬浮液或高压灭菌过程中产生的，而是通过与Anunderwater颗粒相结合的泡沫挤出。这使添加添加剂变得更容易。尤其是在研究和行业中使用了技术修饰（例如，CE =链扩展器），以提高技术热塑性塑料的熔体强度，这通常太低而无法进行泡沫。除灵活性外，许多参数还增加了复杂性。此外，在与CE反应过程的熔体过程中发生，因此不断发生重大的材料特性变化。当处理大型配方或热敏感材料时，对某些最终性质的控制也同样复杂。系统和周围的许多数据已经被捕获以进行监视；但是，没有发生永久的，系统的记录和评估。此外，需要对过程进行科学评估所必需的某些值，但有时根本没有被记录或仅部分记录（例如熔体粘度，泡沫珠的尺寸分布）。数量和质量也可以通过适当的内线分析来提高。必须（i）实时收集所有科学和技术相关的数据，以及（ii）使用合适的数字方法来评估这些数据 - 已经是真实的在运行过程中的时间。这尤其包括最终产品的特性。理想情况下，可以识别以前看不见的过程和材料参数之间的关系（例如，反应性，流变学和扩展的相关性）。此外，可以创建数据基础，该数据基础可以通过使用激活性学习或机器学习来对系统进行自优化。通过对理解和预测未知材料行为的进一步冲动进行建模。分析的质量也得到了提高，从内联流变学中可以明显看出：在这里，与离线测量（板板）相比，相关的（较高）剪切速率是测量的，并且在制备和测量过程中重复熔化不再是必不可少的，尤其是在化学修饰和热敏感的样品的情况下。系统概念专门包含允许数字交换AndRecord并保存先前缺少的测量变量的组件。可以根据压力，流动行为和粒径（分布）和过程影响来追溯材料变化。因此，需要一个内联的节湿器，其他压力传感器，粒子分析仪和合适的数字外围设备。