Graco Inc.

Composite Fiber Winding and Pultrusion 

Equipment for fabricating tanks and pipes

Composite fiber winding (also known as filament winding or wet winding) is a process used to fabricate cylindrical objects such as pressure vessels, golf clubs, underground storage tanks, and pipes. In this process, continuous carbon or fiberglass fibers are coated with catalyzed resin and wound around a male mandrel or mold with specialized equipment.

Pultrusion uses similar continuous fiber and resin feeding but instead of fibers being wetted then wound on a mandrel, the fibers are pulled straight through a forming die to make continuous composite products. Typical products produced in this manner are rods, I-beams, window frames, and leaf springs.

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