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Ageing of injection moulded thermoplastic micro parts

Injection moulded parts with small or thin-walled dimensions can be found in nearly all applications. Due to the reduced geometric dimensions and the resulting change in flow and cooling conditions during processing, the formation of the physical structure in the part is affected. These changes ultimately have an impact on the part performance in use. As a result of various external loads also time dependent physical and chemical ageing processes take place in the part, whereby a change of material and part properties may also be caused. The extent to which the component dimensions and process-induced structural properties affect the ageing behaviour of thermoplastic micro-parts has so far been barely explored.

Therefore, in this work the ageing behaviour of injection moulded micro-parts is investigated. For this purpose, differently scaled tensile bars exemplary made of the technical thermoplastics PC and PA66 are used and artificially aged by oven storage. This allows a systematic investigation of the effect of part dimensions on the physical and chemical ageing processes in micro- and thin-wall parts and the resulting changes in properties in use. Moreover, by means of a dynamic mould tempering a varying of the cooling conditions and thus of the forming physical structure is carried out. This is to examine the extent of the influence of the manufacturing process on the ageing behaviour of micro and thin-walled parts and how the long-term properties in use can be favoured.

Lesen Sie die deutsche Zusammenfassung auf Kunststoffe.de
Author
 Steve Meister

Steve Meister
Lehrstuhl für Kunststofftechnik
Universität Erlangen-Nürnberg

Information

Free keywords: Micro Injection Moulding, Long-Term Properties, Ageing, Polamide 66, Polycarbonate, Mechanical Properties, Cooling Conditions
Institute / chair: Technische Fakultät der Universität Erlangen-Nürnberg
Language: German
Technical consultant for expert services: Prof. Dr.-Ing. Dietmar Drummer, Prof. em. Dr.-Ing. Dr. h.c. Gottfried W. Ehrenstein, Prof. Dr.-Ing. Georg Steinbichler
Publication year: 2016
Provider: Wissenschaftlicher Arbeitskreis Kunststofftechnik (WAK) / Kunststoffe.de

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