Journal
MATERIALS
Volume 15, Issue 14, Pages -Publisher
MDPI
DOI: 10.3390/ma15145052
Keywords
recycling; weft knitting; hybrid yarn; thermoplast; end of Life-CFRP
Categories
Funding
- AiF [265 EBR]
- Federal Ministry for Economic Affairs and Climate Action
- NEDO, Japan [P14005]
- Austrian Science Fund (FWF) [P14005] Funding Source: Austrian Science Fund (FWF)
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Recycling challenges in the use of carbon fibers can be addressed through solvolysis recovery and subsequent yarn spinning.
Carbon fibres (CF) are used in CF reinforced plastic (CFRP) components. However, waste from CF yarn trim, CFRP and the end of life (EOL) CFRP structures will cause a recycling challenge in the next decades because of strict environmental regulations. Currently, recycling is carried out almost entirely by the use of pyrolysis to regain CF as a valuable resource. This high temperature process is energy consuming, and the resulting fibres are brittle. Hence, they are not suitable for processing of textiles into yarns or new reinforcement structures. To enable grave to cradle processing, a new approach based on a solvolysis recovery of CF and subsequent yarn spinning to obtain hybrid yarns suitable for textile processing, especially by weft knitting, was the focus of the international research project IGF/CORNET 256EBR. For the first time, it was possible to process hybrid yarns made of rCF on a weft knitting machine to produce biaxial reinforced structures to form CFRP from recycled carbon fibres. Therefore, various modifications were done on the textile machinery. In this way, it was possible to process the rCF and to get out a reproducible textile structure for the production of 3D recycled CFRP (rCFRP) parts.
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