权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Investigations to the influence of material and grain shape on the dissipation in the solids conveying of single-screw extruders

物料和颗粒形状对单螺杆挤出机固体输送耗散的影响研究

基本信息

批准号：
242898529
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：
2014
资助国家：
德国
起止时间：
2013-12-31 至 2017-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/242898529?language=en
关键词：
Investigations influence material grain shape

项目摘要

While modeling the process conditions of single screw extruders the pellets size and shape is widely neglected. It is only considered for the design of grooved bushes. Nevertheless the pellets size and shape have a strong influence on the flow conditions in the screw channel. Internal and external friction affect the solid conveying as well as the melting process. While the solid conveying strongly depends on the friction coefficients ratio, the melting process is influenced by their absolute values. Sharp-edged pellets cause high internal friction and therefore dissipation in the solid plug. More spherical pellets with a smooth surface however produce less friction. Cylindrical pellets even could arrange in that way that they roll over on each other. This effect would induce much less dissipation. Common models describing the melting process in the screw channel neglect the dissipation in the solid bed yet. Therefore, in this research project the influence of the pellets material and shape on their dissipation is to be investigated using polyamide and polypropylene. These materials will be granulated using hot and cold-pelletizing. Then, the solid conveying and the melting process will experimentally investigated, simulated and mathematically modeled.

在对单螺杆挤出机的工艺条件进行建模时，颗粒的尺寸和形状被广泛忽略。它仅用于槽式衬套的设计。然而，颗粒的尺寸和形状对螺旋通道中的流动条件有很大的影响。内摩擦和外摩擦影响固体的输送和熔化过程。摩擦系数比对固体输送有很大的影响，而摩擦系数比的绝对值对熔化过程有很大的影响。尖锐边缘的颗粒引起高的内部摩擦，因此在固体塞中耗散。然而，表面光滑的球形颗粒产生的摩擦力较小。圆柱形的小球甚至可以以这种方式排列，它们彼此滚动。这种效应会导致更少的耗散。常用的螺旋槽内熔融过程模型忽略了固体床内的耗散。因此，在本研究项目中，将使用聚酰胺和聚丙烯研究颗粒材料和形状对其耗散的影响。这些材料将使用热造粒和冷造粒进行造粒。然后，对固体输送和熔化过程进行了实验研究、数值模拟和数学建模。