Renforcement local de pièces plastiques recyclées des fibres continues pour des applications structurales à faible impact en C02/kg

This study explores the local reinforcement of recycled polyamide 6 (PA6) parts, made from fishing nets, with continuous fiber ribbons (PA6-GF), as part of a low-carbon footprint approach. Three processing methods were compared: thermocompression, injection overmolding and automated fiber placement (AFP). The mechanical properties (tensile, flexural) of the composites obtained are assessed and compared with those of reinforced virgin PA6. In-depth characterizations (DSC, ATG, SEM, FTIR, ILSS and peel tests) reveal the microstructural mechanisms explaining the differences in performance between the processes. A hygroscopic ageing analysis demonstrates the impact of water absorption on virgin, recycled and glass-fibre reinforced (GF) PA6. Finally, an innovative approach evaluates the recycling of a PA6/GF composite, followed by a new AFP reinforcement with carbon fibers. This approach aims for an optimum compromise between environmental sustainability and mechanical properties, opening up prospects for the circular economy of composite materials. The results underline the potentialof AFP for demanding structural applications, while minimizing CO₂ impact.