The hot runner system is to ensure that the plastic of the runner and the gate is kept molten by heating. The hot runner system is generally composed of several parts, such as a hot nozzle, a shunt plate, a temperature control box and accessories. The hot nozzle generally includes two kinds: Open hot nozzle and needle valve hot nozzle, because the hot nozzle form directly determines the hot runner system selection and mold manufacturing, so the hot runner system is often divided into open hot runner system and needle valve hot runner system accordingly.

The following are the 4 advantages of hot runner system:

1. The reuse of nozzle material will degrade the performance of plastics, and the use of hot runner system without nozzle material can reduce the loss of raw materials, thereby reducing the cost of products. The temperature and pressure in the cavity are uniform, the stress of the plastic parts is small, the density is uniform, and the product is better than the general injection molding system under the smaller injection pressure and the shorter molding time. For transparent parts, thin parts, large plastic parts or high requirements of plastic parts can show its advantages, and can produce larger products with smaller models.

2. The hot nozzle adopts standardized and serialized design, equipped with a variety of nozzle heads for choice, and has good interchangeability. The electric heating ring with unique design and processing can achieve uniform heating temperature and long service life. Hot runner system equipped with hot runner plate, temperature controller, etc., compact design, variety, easy to use, stable and reliable quality.

3. Small pressure loss. The temperature of the hot runner is equal to that of the injection molding machine nozzle, which avoids the surface condensation of the raw material in the runner, and the injection pressure loss is small. 4. No water inlet material, no post-processing is required, so that the whole molding process is completely automated, saving working time and improving working efficiency.