A hot runner mold refers to a mold that uses a heating device to keep the melt in the runner from solidifying at all times. Because it has a shorter forming cycle than traditional molds and saves more raw materials, hot runner molds are widely used in various industrialized countries and regions around the world today.

The hot runner system generally consists of several parts, including a hot nozzle, a splitter plate, a temperature control box, and accessories. There are generally two types of thermal nozzles: open type and needle valve type. Due to the fact that the form of the hot nozzle directly determines the selection of the hot runner system and the manufacturing of the mold, the hot runner system is often divided into an open hot runner system and a needle valve hot runner system accordingly. The splitter plate is used when the first mock examination has multiple cavities or multi-point feeding, single point feeding, but the material level is offset. The material is usually P20 or H13. The splitter plate is generally divided into two categories: standard and non-standard, and its structural form is mainly determined by the distribution of the cavity on the mold, nozzle arrangement, and gate position. The temperature control box includes the host, cables, connectors, and wiring male and female sockets. Hot runner accessories typically include heaters and thermocouples, runner sealing rings, connectors, and junction boxes.