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Resin Infusion and Vacuum Assisted Resin Infusion Moulding (RIM and VARIM) RIM is has attributes of both RTM and hand layup processes in that an open mould is used to determine the geometry of the component, similarly to hand layup, and the resin is applied to the pre-formed component in a similar fashion to RTM. In RIM a release agent is applied to the open mould prior to fibre laying. Once the desired number of layers have been applied and the pre-form is complete a resin dispersion tool is applied to the top of the mould. The objective is to assist in the even distribution of the resin throughout the mould, minimising the probability of dry regions persisting which would adversely affect the physical properties of the component. A vacuum bag is fitted to the top of the open mould, attached to a vacuum sealing tape, and is subsequently evacuated. The resin is then drawn into the mould by the pressure differential and infuses through the fibre pre-form. The mould may then be placed into an autoclave to allow the resin to cure, after which a post curing cycle may also be used to produce the final component. Due to the accessibility provided by an open mould, complex geometries incorporating specific fibre orientations achieved by hand layup are possible. Consequently RIM may be used to produce high- performance CFRP’s [214, 222, 223]. Filament Winding (FW) Filament winding (FW) is an automated process that is often used to produce cylindrical and geometrically symmetrical, hollow structures such as pipes and aircraft structures. The process draws the fibres from a yarn through a resin bath and onto a rotating mandrel, where the fibres are wrapped around the axis of rotation. The mandrel may be heated during winding to assist in the resin distribution once the fibres are on the mandrel. As the 58PDF Image | Supercritical Fluids and Their Application to the Recycling of High-Performance Carbon Fibre Reinforced Composite Materials
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