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CFRP’s and hence the requirement for this research. GFRP’s represent the vast majority of polymeric composite materials used to date, however, whilst being the minority with respect to annual production volumes, CFRPs represent a significant and growing proportion of the market according to value, attributable to the embodied energy and mechanical performance of carbon fibre [264]. This section focuses on the recycling of CFRP’s, detailing recycling technologies and their characteristics. Mechanical Recycling Process Technologies It is necessary to distinguish between mechanical grinding as a recycling technology and cutting that is used to reduce the size of material. Commercial CFRP’s are used to make large components, such as aerofoils, and it is not considered feasible to envisage a recycling technology that would handle a component of such size in its entirety. Therefore, size reduction is considered necessary irrespective of the recycling technology. Mechanical recycling, to date, consists of grinding of CFRP’s to produce fine particulates that may be subsequently incorporated into new composite materials. Comminution - Mechanical Grinding and Milling Mechanical grinding or milling of CFRP’s has been presented in the literature, although this methodology is typically reported for GFRP’s owing to their greater abundance. The technique aims to reduce the size of material such that it may be incorporated into Sheet Moulding Compound (SMC) and thereby produce a recycled material. This may be done using impacting, cutting or stirred media mills followed by a classification step to separate particles according to their size. New SMC’s may then be produced by inclusion of a 65PDF Image | Supercritical Fluids and Their Application to the Recycling of High-Performance Carbon Fibre Reinforced Composite Materials
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