Filament Winding:

is a fabrication technique for creating composite material structures. The process involves winding filaments under varying amounts of tension over a male mold or mandrel. The mandrels rotate while a carriage moves horizontally, laying down fibers in the desired pattern. The most common filaments are carbon or glass fiber and are coated with synthetic resin as they are wound. Once the mandrel is completely covered to the desired thickness, the mandrel is placed in an oven to solidify (set) the resin. Once the resin has cured, the mandrel is removed, leaving the hollow final product.