Three-dimensional Modeling of Plastic Transportation in a Single-screw Extruder - Joint Examination of Feed Zone and Melting Zone

单螺杆挤出机中塑料输送的三维建模 - 进料区和熔融区的联合检查

基本信息

项目摘要

In plastics processing single-screw extruders are used to produce profiles, pipes, plates, films and many other products. The single-screw extruder is a continuously working production machine. Usually the optimization is focused on an increase of the throughput performance, while keeping the product quality on a high level. Previous investigations show that the throughput performance is limited on the one hand by feeding the extruder, on the other hand by the melting performance. At high rotational speed the screw is not able to draw in enough plastic particles from the hopper to fill the screw channels entirely. Simultaneously the inserted plastic particles have to be melted completely and homogeneously in the following melting zone to ensure a high product quality. Thereby, simulation approaches, especially three-dimensional models, essentially contribute to the under-standing of the transport phenomena in the feed and melting section of single-screw extruders. Until now, both sections had to be handled separately in the existing models due to the complex physical processes at their interface. However, an overall approach is absolutely necessary, because it is not effective to increase the throughput performance without considering the product quality. The aim of this research project is the integrated three-dimensional simulation of the feed and melting section by means of a single simulation environment. The discrete-element method is going to be used for the simulation of the solid particles transportation. Thus, the inserted plastic particles can be considered individually. The subsequently developing melt flow will be calculated with the help of the finite-volume method. The coupling of both phases, including phase transitions, will be realized in the open-source simulation environment CFDEM®coupling by means of a novel melting model, which will be established and implemented within the project for the first time. Moreover, a special experimental set-up is planned to be utilized to support the model development and validation. The general applicability will be shown by means of a study on a single screw extruder with both smooth and grooved feeding barrels. In addition to the obtained pressure and temperature data, dead-stop experiments will be performed to observe and evaluate the transition point as well as the melting behavior inside the extruder. Afterwards the feeding barrel and the screw will be optimized on the basis of the simulation results. The project is planned to be realized within an international D-A-CH-project. The cooperation consists of the research institutes Institut für Kunststofftechnik (University of Stuttgart, Germany) and CFDEMresearch (Linz, Austria). Within the cooperation, the competences of both research institutes will be pooled for the project.
在塑料加工中,单螺杆挤出机用于生产型材、管材、板材、薄膜和许多其他产品。单螺杆挤出机是一种连续工作的生产机械。通常优化的重点是提高吞吐量性能,同时保持产品质量处于高水平。先前的研究表明,吞吐量性能一方面受到挤出机进料的限制,另一方面受到熔化性能的限制。在高转速下,螺杆无法从料斗中吸入足够的塑料颗粒来完全填充螺杆通道。同时,插入的塑料颗粒必须在随后的熔化区中完全且均匀地熔化,以确保高产品质量。因此,模拟方法,尤其是三维模型,本质上有助于理解单螺杆挤出机进料和熔融部分的传输现象。到目前为止,由于界面上的物理过程复杂,这两个部分必须在现有模型中单独处理。然而,整体方法是绝对必要的,因为在不考虑产品质量的情况下提高吞吐量性能是无效的。该研究项目的目的是通过单一模拟环境对进料和熔化部分进行集成三维模拟。离散元方法将用于固体颗粒输运的模拟。因此,插入的塑料颗粒可以单独考虑。随后发展的熔体流动将借助有限体积法进行计算。包括相变在内的两个相的耦合将在开源模拟环境CFDEM®耦合中通过新颖的熔化模型来实现,该模型将在该项目中首次建立和实施。此外,计划利用特殊的实验装置来支持模型的开发和验证。通过对具有光滑和沟槽喂料筒的单螺杆挤出机的研究,将显示其普遍适用性。除了获得压力和温度数据外,还将进行死停实验来观察和评估转变点以及挤出机内部的熔化行为。随后将根据模拟结果对加料筒和螺杆进行优化。该项目计划在国际 D-A-CH 项目内实现。该合作由研究所 Institut für Kunststofftechnik(德国斯图加特大学)和 CFDEMresearch(奥地利林茨)组成。在合作范围内,两个研究机构的能力将集中用于该项目。

项目成果

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Professor Dr.-Ing. Christian Bonten其他文献

Professor Dr.-Ing. Christian Bonten的其他文献

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{{ truncateString('Professor Dr.-Ing. Christian Bonten', 18)}}的其他基金

Automated Optimization of Spiral Shearing and Mixing Elements for Single-screw Extruders
单螺杆挤出机螺旋剪切和混合元件的自动优化
  • 批准号:
    441921604
  • 财政年份:
    2020
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Analysis of the bubble building in with blowing agent loaded polymer melts
负载发泡剂的聚合物熔体中气泡形成的分析
  • 批准号:
    426052763
  • 财政年份:
    2019
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Improved Description of Elongational Flow Behavior During the Processing of Highly Filled Plastics
高填充塑料加工过程中拉伸流动行为的改进描述
  • 批准号:
    435000494
  • 财政年份:
    2019
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Calculation of the pellet transportation in grooved feed zones, considering varying conveying mechanisms at high screw speeds
考虑高螺杆速度下不同的输送机制,计算沟槽进料区域中的颗粒输送
  • 批准号:
    423276016
  • 财政年份:
    2019
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Development of a new ternary blend with an outstanding combination of properties
开发具有出色性能组合的新型三元混合物
  • 批准号:
    330226041
  • 财政年份:
    2017
  • 资助金额:
    --
  • 项目类别:
    Research Grants (Transfer Project)
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
  • 批准号:
    346097498
  • 财政年份:
    2017
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Experimental and numerical qualification of morphology-property-correlations using the method of essential work of fracture (EWF) by the example of polymer blends
以聚合物共混物为例,使用断裂基本功 (EWF) 方法对形态-性质-相关性进行实验和数值鉴定
  • 批准号:
    322212489
  • 财政年份:
    2016
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Enhancement of the Folgar-Tucker model to predict filler orientation of filler blends and its application in the process simulation
增强 Folgar-Tucker 模型预测填料共混物的填料取向及其在工艺模拟中的应用
  • 批准号:
    327744866
  • 财政年份:
    2016
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Structural elucidation of network effects in highly filled polymers
高填充聚合物中网络效应的结构阐明
  • 批准号:
    316683943
  • 财政年份:
    2016
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Production of a Metal/Plastic Hybrid Structure via Impact Extrusion
通过冲击挤压生产金属/塑料混合结构
  • 批准号:
    263370339
  • 财政年份:
    2015
  • 资助金额:
    --
  • 项目类别:
    Research Grants

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