Plastic molds can be divided into three categories, based on the different casting system types:

(1) Large water-mouth mold

The runner and gate are located on the parting line, and are demolded together with the product during mold opening. The design is the simplest, easy to process, and the cost is relatively low, so many people use the large water mouth system for operation. The structure of plastic molds is divided into two parts: moving molds and fixed molds. The movable part of the injection machine is called the moving mold (mostly the ejection side), and the stationary part at the injection end of the injection machine is generally called the fixed mold. Due to the fact that the fixed mold part of the large water outlet mold is generally composed of two steel plates, this type of structural mold is also called a two plate mold. The two plate mold is the simplest structure in the large water mouth mold.

(2) Small nozzle mold

The runner and gate are not on the parting line, usually directly on the product, so it is necessary to design an additional set of nozzle parting lines, which is more complex and difficult to process. Generally, a fine nozzle system should be selected according to product requirements. The fixed part of the fine water nozzle mold is generally composed of three steel plates, so this type of structural mold is also known as the "three plate mold". The three-plate mold is the simplest structure in fine water nozzle molds.

(3) Hot-runner mold

This type of mold has a structure similar to that of a fine nozzle, with the biggest difference being that the runner is located in one or more hot runner plates and hot nozzles with constant temperature, without cold material demolding. The runner and sprue are directly on the product, so the runner does not need to be demolded. This system is also known as a no nozzle system, which can save raw materials and is suitable for situations where raw materials are expensive and product requirements are high. Design and processing are difficult, and mold costs are high. Hot-runner system, also known as hot runner system, mainly consists of hot runner sleeve, hot-runner plate, and temperature control electrical box. Our common hot runner systems come in two forms: single point hot runner and multi-point hot runner. Single point hot gate is a plastic mold that uses a single hot gate sleeve to directly inject molten plastic into the mold cavity. It is suitable for plastic molds with a single cavity and a single gate; Multi point hot runner is used to branch the molten material into each hot runner sleeve through a hot-runner plate and then enter the mold cavity. It is suitable for single cavity multi-point feeding or multi cavity molds.