Spray up is a method used for composite molding. Resin matrix was sprayed out by the compressed air through the spray gun. The fiber/yarn as the reinforcement was cut simultaneously. The sprayed resin touched the cut fiber/yarn and both of them fall into the board/mold. The process might repeat to get the designed thickness. That is why the work process is efficient and can easily cope with design changes. Thereby, the quality of the material molded by spray up method is closely related to the workers 'skill. Nowadays, natural fibers reinforced materials have gained extensively interests. In particularly, the use of natural fiber reinforced composites has continuously increased due to their low density, low cost and environmental friendliness. Moreover, these natural fibers are also helpful to reduce both the oil dependency and carbon dioxide emission.
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