The working principle of injection molds is based on the thermoplastic properties of plastics and the injection pressure of injection molding machines. Firstly, plastic particles are heated and plasticized inside the barrel of the injection molding machine, forming a molten state. Then, the injection molding machine injects the molten plastic into the mold cavity through high pressure. In the mold, the plastic is cooled and solidified to form the desired shape and structure. Finally, by opening the mold, the formed plastic product is taken out of the mold.

The structure of injection molds usually includes parts such as the pouring system, temperature control system, molded parts, and structural parts. It consists of two parts: a moving mold and a fixed mold. The moving mold is installed on the moving template of the injection molding machine, while the fixed mold is installed on the fixed template of the injection molding machine. Injection molds can be recycled throughout the entire usage process by simply installing the mold on the injection molding machine, then injecting plastic into the mold for cooling and shaping. After the plastic solidifies, the upper and lower molds can be separated and the preform can be removed.