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Main Disadvantages: i) Materials cost is still higher than for non-preimpregnated fabrics although resin costs are lower than those required for aerospace applications. ii) Tooling needs to be able to withstand higher temperatures than Infusion Processes. (typically 80-140°C). Typical Applications: High-performance wind-turbine blades, large racing and cruising yachts, rescue craft, train components. 6.10 SPRINT®/SparPregTM - “Out of Autoclave” Description When using prepreg materials in thick laminates (>3mm) it becomes difficult to remove entrapped air between plies, and around laminate details like ply overlaps, during the curing process. To overcome this problem in traditional prepreg materials a number of warm debulking stages are introduced during lay-up to remove trapped air which sig- nificantly increases manufacturing times. In recent years Gurit has patented a number of modified prepreg products that enable the manufacture of high quality (low void content) thick laminates in one processing step. SPRINT® materials consist of a resin film sandwiched between two dry fibre layers. Once placed in the mould, a vacuum is pulled to extract all of the air in the laminate (monolithic and/or sandwich) before heat is applied to allow the resin to soften and impregnate the dry fibre layers and then cure. SparPregTM is a modified prepreg that enables air to be easily removed from between adjacent plies during the application of vacuum and the subsequent curing process. Materials Options: Resins: Fibres: Cores: Most commonly epoxy but other resins available. Any. Most, although PVC foam needs special procedures due to the elevated temperatures involved in the process. 56 - GTC-6-0417PDF Image | GUIDE TO COMPOSITES
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