Popular hot runner system

2021/05/21

Hot runner system, also known as hot runner system, is mainly composed of hot gate sleeve, hot runner plate, temperature control electric box. Our common hot runner system has two forms: single point hot gate and multi-point hot gate. Single point hot sprue is a single hot sprue sleeve directly injected the molten plastic into the cavity, it is suitable for single cavity single sprue plastic mold; The multi-point hot gate is to branch the molten material into the separate heat gate sleeve through the hot gate plate and then enter the mold cavity. It is suitable for single-cavity multi-point feeding or multi-cavity mold.

Advantages of hot runner system

(1) No outlet material, no need for post-processing, so that the whole molding process is fully automated, save working time, improve work efficiency.

(2) Small pressure loss. The temperature of the hot runner is equal to that of the injector of the injection molding machine, which avoids the surface condensation of the raw material in the runner and reduces the loss of the injection pressure.

(3) the repeated use of nozzle material will degrade the plastic performance, and the use of hot runner system without nozzle material, can reduce the loss of raw materials, thereby reducing the cost of products. In the cavity, the temperature and pressure are uniform, the plastic parts stress is small, the density is uniform, under the smaller injection pressure, the shorter molding time, the injection molding system is better than the general product. For transparent parts, thin parts, large plastic parts or high-demand plastic parts can show its advantages, and can be used to produce larger products with smaller models.

(4) the hot nozzle adopts the standardized, serialized design, equipped with a variety of optional nozzle head, good interchangeability. The electric heating ring with unique design and processing can achieve uniform heating temperature and long service life. Hot runner system is equipped with hot runner plate, temperature controller, etc., exquisite design, variety, easy to use, stable and reliable quality.

◆The deficiency of the application of hot runner system

(1) The closure height of the overall mold is increased, and the overall height of the mold is increased due to the addition of hot runner plate, etc.

(2) the heat radiation is difficult to control, the biggest problem of the hot runner is the heat loss of the runner, which is a major issue that needs to be solved.

(3) there is thermal expansion, thermal expansion and cold contraction is our design to consider the problem.

(4) The cost of mold manufacturing increases, and the price of standard parts of hot runner system is higher, which affects the popularity of hot runner mold.