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Effects of grooves on processing conditions within grooved plasticizing units in single screw extrusion

单螺杆挤出沟槽塑化装置内沟槽对加工条件的影响

基本信息

批准号：
346097498
负责人：
Professor Dr.-Ing. Christian Bonten
金额：
--
依托单位：
Institut für Kunststofftechnik (IKT)
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2017
资助国家：
德国
起止时间：
2016-12-31 至 2020-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/346097498?language=en
关键词：
Effects grooves processing conditions within

项目摘要

Single-screw extrusion is an important production process for large-scale plastic product manufacturing at low cost. Conventional single-screw extruders are a combination of a conveying screw with three processing zones and a smooth barrel. Today, variants with grooved feed zones and/or barrier screws are the state of the art and widely used. Due to the typical occurrence of wear in the feed zone, low melting rates and poor mixing performance when using grooved feed extruders, the use of continuously grooved barrels in combination with barrier screws has gained momentum within the last years. Extruders with a grooved plasticizing zone have since proved to feature uniform pressure profiles, little wear, energy efficient operation and low melt temperatures.Whereas melting and flow models are well established for conventional extruders, their validity and application for grooved plasticizing zones so far has not been investigated. The existing model concepts are based on assumptions and experience only, which lack scientific validation. Thus, the aim of this project is a detailed examination of the grooves influence on the process. A model will developed, enabling an analytical or simple numerical description (e. g. with finite differences) of what happens within a grooved plasticizing unit. First, experimental studies with a dividable extrusion barrel as well as a screw simulator will give insight to which extent the grooves affect the melting and flow behavior. Inline measurements based on ultrasound technology will be used in order to investigate the temperature and residence time distribution. The results will help to revise and adjust the current model concepts. Subsequently, the newly improved model will then be described mathematically and implemented into a simulation tool. A final set of reference experiments is used to conclusively validate the model. Therefore, the result to be achieved within this project is a deepened and improved understanding of the melting and flow processes within grooved plasticizing zones. The application within a computational model will allow describing and predicting these processes for improved design of continuously grooved single-screw extruders.

单螺杆挤出是大规模低成本制造塑料制品的重要生产工艺。传统的单螺杆挤出机是具有三个加工区的输送螺杆和光滑机筒的组合。如今，带槽进料区和/或屏障螺杆的变体是最先进的，并得到广泛应用。由于在使用带槽进料挤出机时进料区通常会发生磨损、熔融速率低和混合性能差，因此在过去几年中，连续带槽机筒与屏障螺杆的组合使用获得了发展势头。带槽塑化区的挤出机具有压力分布均匀、磨损小、运行节能和熔体温度低等特点，而传统挤出机的熔融和流动模型已建立得很好，但其有效性和应用至今尚未得到研究。现有的模型概念仅基于假设和经验，缺乏科学验证。因此，本项目的目的是详细检查凹槽对工艺的影响。将开发一个模型，以便进行分析或简单的数值描述（例如：G.有限差分）在带槽塑化单元内发生的情况。首先，实验研究与可分割的挤出机筒以及螺杆模拟器将提供洞察到何种程度的凹槽影响熔融和流动行为。将使用基于超声技术的在线测量，以研究温度和停留时间分布。研究结果将有助于修正和调整现有的模型概念。随后，将对新改进的模型进行数学描述，并将其实现为仿真工具。最后一组参考实验用于最终验证模型。因此，在这个项目中要实现的结果是加深和改善对槽塑化区内的熔融和流动过程的理解。在计算模型中的应用程序将允许描述和预测这些过程，以改进连续开槽单螺杆挤出机的设计。