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across an entire layer of the mould with the second layer (or ply) being rotated through an angle, by rotating the laying head, of up to 90O. With the second layer laid over the first, the head is rotated again in preparation for laying the third layer, a process that is repeated until the desired number of layers is achieved [229-231]. Similarly to ATL, AFP uses pre-preg material however, AFP uses pre-preg carbon fibre tows. The width if a carbon fibre tow is dependent upon the number of fibres within the tow but, in general, is many times less than that of the unidirectional tape used in ATL. Consequently, it may take significantly greater amounts of time to lay fibres over the same area as ATL. The significant advantage of AFP over ATL is that due to the narrow nature of the tows, fibre placement over complex geometries is possible, therefore allowing for the automated production of complex components that may not be possible with ATL [232-234]. Due to the high precision, reproducibility and consistency of ATL and AFP, these techniques are used to produce high-performance components in the aerospace industry. However, the substantial capital investment required for equipment and tooling has prevented the widespread use of AFP and ATL in other areas of the composites manufacturing industry. This overview of common manufacturing processes of CFRP’s is used to provide the context of the composite recycling challenge. Assuming that recycled carbon fibres were readily available it is evident, from the processes presented herein, that manufacturing secondary CFRP’s with recycled fibres requires adaptation of the manufacturing process, post recycling preparation of the fibres or a combination of both. Characterisation of the recycled fibres is paramount given that the structural reinforcement of CFRP’s is directly linked to the fibre 60PDF Image | Supercritical Fluids and Their Application to the Recycling of High-Performance Carbon Fibre Reinforced Composite Materials
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