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Analysis and Optimisation of Liquid-Supported Stretch Blow Moulding

Liquid supported stretch blow moulding is an innovative production process for Polyethylene terephthalate (PET) bottles and containers. It combines the separate blowing and filling phases of conventional stretch blow moulding. The process modification is mainly characterized by forming the plastic product by using the liquid product instead of pressurized air. Consequently, possible improvements evolve regarding production cycle time, energy consumption and machine footprint. To make use of these advantages, comprehensive process understanding is required.

In this contribution, a method of combined experimental and numerical process analysis is presented. The experiments are conducted with the help of a prototype machine. Using a Design of Experiments approach, the correlation between process parameters and product quality is determined. In the numerical analysis, a process model is set up. Thereby, the strong dependency of the PET behavior concerning strain rate and temperature is implemented. Moreover, the Fluid-Structure-Interaction as well as the thermal cooling due to the increased heat transfer are included. The numerical model is evaluated by the experimental results, which allows a reliable process prediction dependent on the actual process parameter configuration.

Lesen Sie die deutsche Zusammenfassung auf Kunststoffe.de
Author
 Johannes Zimmer

Johannes Zimmer
Lehrstuhl für Polymerwerkstoffe
Technische Universität Dortmund

Information

Free keywords: Stretch Blow Molding, PET, Fluid-Structure-Interaction, Visco-hyperelasticity, Thermo-Mechanical Simulation, Smoothed Particle Hydrodynamics (SPH), Design of Experiments, Finite-Element-Analysis
Institute / chair: Fakultät Maschinenbau der Technischen Universität Dortmund
Language: German
Technical consultant for expert services: Prof. Dr.-Ing. Markus Stommel (Betreuer), Prof. Dr.-Ing. Christian Hopmann
Publication year: 2015
Provider: Wissenschaftlicher Arbeitskreis Kunststofftechnik (WAK) / Kunststoffe.de

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