Injection molding machine using plastic after heated to a certain temperature, to melt into a liquid, the nature of the molten liquid with high-pressure injection to the sealed cavity, after cooling to finalize the design, plastic mould out after get the required product.

Four elements of injection molding:

1. Plastic mold 2. Injection molding machine 3. Plastic raw materials 4. Molding conditions

Plastic mold, most of the use of two - board dies, three - board modes, also have a part of the row - block model with sliding block.

Basic structure: 1. Male mould (lower mould) male mold plate, male mold auxiliary board, top pin board, male template. 2. Female mould (upper mould) female template, mother-die plate, in rubber ring, positioning ring. 3. Cooling of the system. The temperature of the mold shall be fixed.