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mandrel rotates it is necessary to continually move either the mandrel or the fibre feeding assembly horizontally such that fibres are laid over the entire surface of the mandrel. This process is carried out for a pre-determined period of time, which in turn governs the number of fibre layers at any given point on the mandrel. Once complete the mandrel, wound with fibre coated in resin, is placed in an oven and allowed to cure. After curing the component is removed from the mandrel to leave a hollow cylindrical tube of cured thermoset resin reinforced with continuous fibres [217, 224, 225]. Although cylindrical mandrels are typical, it is possible to use filament winding to produce components with a square-planar, conical, concave, convex, disc and other geometries having axial symmetry about which the rotation takes place [226-228]. Automated Fibre Placement and Automated Tape Laying (AFP and ATL) Automated processes allow for the increased production throughput of CFRP’s and, aside from filament winding, AFP and ATL are two of the most prominent automated processes. FW is essentially reliant upon the target component having symmetry along the rotational axis whereas this limitation does not apply to AFP and ATL. Consequently these techniques may be employed to produce CFRP’s of many geometries. Although the principle of operation is similar, subtle differences in the development of AFP and ATL leads to their deployment in differing duties. ATL utilises pre-preg uni-directional tape that is laid over the mould of the desired product. The pre-preg is heated as it is laid to ensure it is workable, while compacting rollers are used to reduce the space between tape layers and therefore reduce the voidage. Uni-directional tape is usually laid in one direction 59PDF Image | Supercritical Fluids and Their Application to the Recycling of High-Performance Carbon Fibre Reinforced Composite Materials
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