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Compression Induced Solidification (CIS) of amorphous thermoplastics

Derived from the fundamental problems of thermoplastics processing the following case can be made: If it is possible to avoid the gradients of temperature and pressure over time and space during cooling and especially at the phase change, parts with excellent homogeneity and dimensional stability can be manufactured. To achieve this, the phase change should not occur postponed during cooling, but due to simultaneous densification of the entire part volume by pressure. The subsequent cooling in the solid state only leads to uniform shrinkage.

For the investigation of this novel processing approach, the Compression Induced Solidification (CIS), fundamental examinations of the behavior of amorphous thermoplastics during compression, cooling and expansion were made. These include the analysis of the solid, entropy-elastic and molten phases as well as the investigation of deformation behavior and pressure induced temperature increase in these phases. Therefore the necessary mold and process technology was developed. Additionally the process was realized under slow as well as fast conditions, whereas the latter are of practical relevance. Furthermore the resulting volumes and part properties were investigated. As a result, criteria to choose parameter sets for the application of the injection molding process variant CIS are available to the manufacturer.

Lesen Sie die deutsche Zusammenfassung auf Kunststoffe.de
Author
 Natalie Rudolph

Natalie Rudolph
Lehrstuhl für Kunststofftechnik
Universität Erlangen-Nürnberg

Information

Free keywords: Compression Induced Solidification, Compression, Compressibility, Compression heating, High precision
Institute / chair: Technische Fakultät der Universität Erlangen-Nürnberg
Language: German
Technical consultant for expert services: Prof. Dr.-Ing. Dr. h.c. Gottfried W. Ehrenstein (Betreuer), Prof. Dr. Georg Steinbichler, Prof. Dr. Tim A. Osswald, Prof. Dr. Helmut Münstedt, Prof. Dr.-Ing. Dietmar Drummer (Promotionsvorsitz)
Publication year: 2009
Provider: Wissenschaftlicher Arbeitskreis Kunststofftechnik (WAK) / Kunststoffe.de

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