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Contribution to the development of innovative production techniques for the processing of thermoplastic fiber composites

One of the most demanding challenges in processing continuous fibre reinforced thermoplastic composites is to achieve a complete impregnation of the filigree fibres with a Highly viscous melt on an economically viable basis. This thesis provides a comprehensive literature review on the problematic associated with void free impregnation at the example of the techniques commonly employed for impregnation continuous fibre tows. Based on the conclusions derived from this study a nouvelle fibre impregnation technique was developed that utilises the fluid properties of thermoplastic melts. In addition to design and construction of the impregnation tool also the influence of appliances in the tool periphery were investigated. The technical functionality of the impregnation tool is documented by means of extensive experimental investigations. Producing a number of prepregs from different polymeric matrices the impregnation quality was characterized mechanically and optically.

The fluid penetration technique that represents the particularity of the impregnation process is modeled in the thesis theoretical section. There, principal relationships are derived addressing the viscous properties of the melt as well as materially and geometric boundary conditions imposed by the impregnation tool. In addition, the model was utilized for developing strategies that increase the process economic efficiency. Combining the impregnation tool with a filament winding machine – a process that is commonly found in contemporary composite manufacturing – it was successfully demonstrated how the tool’s versatility is making way for innovative progress in composite technology.

Finally, the manufacturing technology necessary for continuous production of circumferencially reinforced thermoplastic composite pipes was designed a tested.

Lesen Sie die deutsche Zusammenfassung auf Kunststoffe.de
Author
 Andreas Lutz

Andreas Lutz
Institut für Verbundwerkstoffe GmbH
Universität Kaiserslautern

Information

Free keywords: Fibre Impregnation, Long Fibre Granulat; LFG, Thermoplast
Institute / chair: Fachbereich Maschinenwesen der Universität Kaiserslautern
Language: German
Technical consultant for expert services: Prof. Dr.-Ing. K. Friedrich (Betreuer), Prof. Dr.-Ing. W. Brockmann
Publication year: 1999
Provider: Wissenschaftlicher Arbeitskreis Kunststofftechnik (WAK) / Kunststoffe.de

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