The injection molding machine uses the thrust of the screw (or plunger) to inject the plasticized plastic in the molten state (that is, the viscous flow state) into the closed mold cavity, and obtain the product after solidification and shaping. Injection molding is a cyclic process, each cycle mainly includes: quantitative feeding-melting plasticization-pressure injection-mold filling and cooling-mold opening and taking parts. After taking out the plastic part, the mold is closed again for the next cycle. Caliken introduced the world's most advanced injection molding machine to produce plastic lenses, and in 2016 produced large-size two-color plastic lenses. The main advantages of plastic lenses: 1. Short product cycle: finished products can be manufactured in a short time. 2. Superior product performance: completeness, color and luster are superior. 3. Multi-purpose: not only used in vehicles, but also in astronomy, medicine, art and other fields.