Injection molding is a manufacturing process that produces parts by injecting molten material into a mold. A variety of materials can be used for injection molding, these materials mainly include metal, glass, elastomers, candy and the most common thermoplastic and thermosetting polymers. The material of the part is fed into a heated barrel, mixed (using a spiral screw), and then injected into the mold cavity, where it cools and hardens the shape of the molding cavity. The parts to be injection molded must be very carefully designed to facilitate the molding process; the material used for the part, the shape and characteristics of the part required, the material of the mold, and the performance of the molding machine must be considered. The wide range of design considerations and possibilities promotes the versatility of injection molding