Gentle Injection Molding of Thermoplastic Polymers
Pretreatment trials and desorption measurements were conducted to gain knowledge on the removal of oxygen dissolved in the resin and to model the mass transport. For this purpose, a measuring fixture was constructed. The influences on the thermo-oxidative degradation of thermoplastic polymers during injection molding were investigated by variation of thermal, mechanical and local thermo-oxidative stress.
Removal of oxygen should be performed at high temperature and low pressure. However, one has to observe limits to avoid degradation. The mass transport in the resin can be described by Fick’s Law, applied on a spherical model using a geometrical correction factor.
Thermo-oxidative degradation occurs in the plasticating unit due to oxygen dissolved in the polymer resin as well as from the surrounding air. A linear relationship of oxygen content and thermo-oxidative degradation exists. An increase in stress by plasticating leads to an increase in thermo-oxidative degradation. However, there is an upper and lower limit depending on the material processed. The processing trials performed on different injection-molding machines revealed application potential in several fields of processing thermoplastic polymers.Lesen Sie die deutsche Zusammenfassung auf Kunststoffe.de
Gentle processing, injection molding, removal of oxygen, desorption measurement, thermo-oxidative degradation, thermoplastic polymers, thermoplastics processing
Institute / chair: Technische Fakultät der Universität Erlangen-Nürnberg
Technical consultant for expert services: Prof. Dr.-Ing. Ernst Schmachtenberg (Betreuer), Prof. Dr.-Ing. Hans-Joachim Radusch, Prof. Dr.-Ing. Dr. h.c. Gottfried W. Ehrenstein
Publication year: 2008
Provider: Wissenschaftlicher Arbeitskreis Kunststofftechnik (WAK) / Kunststoffe.de
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