Supercritical Fluids and Their Application to the Recycling of High-Performance Carbon Fibre Reinforced Composite Materials

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Supercritical Fluids and Their Application to the Recycling of High-Performance Carbon Fibre Reinforced Composite Materials ( supercritical-fluids-and-their-application-recycling-high-pe )

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Hand Layup The hand layup of carbon fibre may be used to produce aesthetic components for low performance applications. The process mimics that of the glass fibre layup process and typically uses out-of-autoclave resins that are cross-linked at, or near to, room temperature. The mould is coated with a layer of resin, onto which the first layer of carbon fibre is added. By applying a small amount of force to the carbon fibre the resin is pressed into the fabric from the mould. A second coating of resin is applied to the back of the fabric prior to adding the second layer of carbon fibre. The process is repeated until the required number of layers is achieved at which point the resin is allowed to crosslink. Compression Moulding (CM) Compression moulding offers advantages over hand layup processes with respect to the time taken per processed part. In compression moulding, carbon fibre that has been pre- impregnated with epoxy resin (pre-preg) may been stacked horizontally within a mould to form layers of a composite. The second half of the mould is then pressed, often using a hydraulic press, into the first half to complete the composite shape. The mould and press are heated during this process, causing the cross-linking of the curing agent to the polymer chains and thereby curing the resin. The cured composite is then removed from the mould and trimmed to remove excess resin. Complex composites mixing carbon fibre pre-preg and sheet moulding compound (SMC) to make a single material may be produced via this method [212]. 56

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