After a product is designed, usually by an industrial designer or an engineer, molds are made by an injection mold maker from metal, usually steel or aluminum, and precision-machined to form the features of the desired part. The injection moldmaker designs the mold to be the inverse of the molded part's features.

Injection mold makers create molds that can produce millions of parts with identical dimensions, shapes, and qualities, therefore the injection moldmaker must be very precise in the mold design process.

Injection molds are made to hold molten plastic that is injected under very high pressure into the mold. The mold is then cooled, and once the material solidifies, a plastic part is formed. The injection mold will open and then the plastic part is ejected. The mold closes and its ready for another injection.

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