The mold used for plastic injection molding is called injection molding mold, or injection mold for short. The injection mold can form plastic products with complex shapes, high precision dimensions or with inserts at one time.

The structure of the injection mold is determined by the type of injection molding machine and the structural characteristics of the plastic part. Each mold is composed of a movable mold and a fixed mold. The movable mold is installed on the movable plate of the injection molding machine, while the fixed mold is installed on the fixed plate of the injection molding machine. During injection, the movable mold and the fixed mold form a pouring system and cavity after being closed. The part is left on the side of the movable mold, and then the plastic part is ejected by the demoulding mechanism set in the movable mold.

Structural classification of injection molds

1. Classified by molding method:

(1) Injection mold: the mold used on the injection machine. It is mainly used for molding thermoplastics, and a few varieties of thermosetting plastics are suitable for the molding of this mold.

(2) Compression mold: a mold that uses compression technology to form plastic parts on a hydraulic press. It is mainly used for molding thermoset plastics.

(3) Pressure injection mold: It is a mold that uses pressure injection technology to form plastic parts on a hydraulic press. It is suitable for molding thermoset plastics.