Filament winding consists of winding resin impregnated fibers or rovings of glass, aramid, or carbon on a rotating mandrel in predetermined patterns. The method provides the greatest control over fiber placement and uniformity of structure. In the wet method, the fiber picks up the low viscosity resin either by passing through a trough or from a metered application system. In the dry method, the reinforcement is in the preimpregnated form. After the layers are wound, the component is cured and removed from the mandrel. Traditionally used to produce pressure vessels, rocket motor cases, tanks, ducting, golf club shafts and fishing rods, filament winding technology has been expanded, and noncylindreical, nonspherical composite parts are now commonplace. Typical thermoset resins used in filament wound parts include polyesters, vinyl esters, epoxies, and phenolics.
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