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A Calibrated Integrative Model to Describe the Tube Formation Zone in Blown Film Extrusion

Amongst all plastic processes, the blown film extrusion is the most important one to produce thin mass products continuously. Increasing the performance of the whole production process can only be achieved by further developments in machine technologies. This also applies to the film blowing process. Here the constraining factor for the whole production line is the cooling system.

To gain a more efficient engineering process it is obvious to simulate the whole film stretching process in interaction with the cooling device. To approach this problem, this work deals with a calibrated, interactive simulation model. It is based on two coupled calculation modules. On the one hand a numerical model is used to describe the film contour and on the other hand a CFD-program is utilised. With this model the stretching processes are calculated based on elongation rate and temperature dependent polymer characteristics. Measuring those material properties can only be done with high effort, if at all. Therefore a calibration of the unknown material parameters is accomplished.

For the first time ever this simulation model allows to calculate a free arising bubble contour based on given process conditions. Those first studies concerning the developed model show its ability to estimate process state generally. Thanks to this model it is possible to take into account the interaction between the cooling system and the bubble reaction. This allows analysing and evaluating the capability of cooling devices in advance.

Lesen Sie die deutsche Zusammenfassung auf Kunststoffe.de
Author

Markus Bussmann
Lehrstuhl für Konstruktion und Kunststoffmaschinen
Universität Duisburg-Essen

Information

Free keywords: Plastics processing, extrusion, blown film extrusion, simulation, process simulation, CFD
Institute / chair: Fakultät für Ingenieurwissenschaften der Universität Duisburg-Essen
Language: German
Technical consultant for expert services: Prof. Dr.-Ing. Johannes Wortberg (Betreuer), Prof. Dr.-Ing. Hans-Joachim Radusch, Prof. Dr.-Ing. Axel Herrmann
Publication year: 2010
Provider: Wissenschaftlicher Arbeitskreis Kunststofftechnik (WAK) / Kunststoffe.de

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