The structure of plastic molds is divided into functions, mainly composed of: pouring system, temperature regulation system, molding parts system, exhaust system, guiding system, ejection system, etc. Among them, the pouring system and molding parts are the parts that are in direct contact with the plastic, and change with the plastic and the product. They are the most complicated parts in the mold, which change the most and require the highest processing finish and precision.

1. Pouring system: refers to the part of the runner before the plastic enters the cavity from the nozzle, including the main runner, the cold material hole, the runner and the gate, etc.

2. Forming parts system: refers to the combination of various parts that constitute the shape of the product, including movable mold, fixed mold and cavity (concave mold), core (punch), forming rod, etc. The core forms the inner and outer surfaces of the product, and the cavity (concave mold) forms the outer and outer surface of the product. After the mold is closed, the core and the cavity constitute the cavity of the mold. According to the process and production requirements, sometimes the core and the die are composed of several pieces, and sometimes they are made as a whole, and inserts are only used in the parts that are easily damaged and difficult to process.

3. Temperature adjustment system: In order to meet the requirements of the injection process for the mold temperature, a temperature adjustment system is required to adjust the temperature of the mold. For injection molds for thermoplastics, the first step is to design a cooling system to cool the mold (the mold can also be heated). The common method of mold cooling is to open a cooling water channel in the mold, and use the circulating cooling water to take away the heat of the mold; the heating of the mold can be installed in and around the mold in addition to using the cooling water to pass hot water or hot oil. Electric heating element.

4. Exhaust system: It is established to remove the air in the cavity during the injection molding process and the gas generated by the melting of the plastic to the outside of the mold. When the exhaust is not smooth, the surface of the product will form air marks (air lines), burning, etc. Bad; the exhaust system of the plastic mold is generally a slot-shaped air outlet opened in the mold to discharge the original cavity air and the gas brought in by the melt.

The above are the four major systems of plastic molds for plastic thermoforming machines. The injection molds of plastic thermoforming machines are divided by function, mainly by: pouring system, temperature regulation system, molding parts system, exhaust system, guiding system, ejection system, etc. composition