Continuous Filament winding
 Continuous Filament winding is an open molding process that uses a rotating “disappearing” mandrel, which is formed from a continuous steel band continuously traveling in a cork-screw motion around the spacer bars and returning through the center after de-molding. Successive stations are used to form layers of varying composition. Both chopped and continuous rovings are used. The part is heated and cured in place as it travels through the line and is cut into a specific length with a traveling cut-off saw. This process is limited to large diameter pipes or cylinder walls. The diameter is infinitely adjustable.