Advantages and Disadvantage of hot runner system
Many customers ask us what is the advantages and disadvantage of hot runner system on plastic injection mold? Here we list some of the hot runner`s advantages and disadvantage for your information.
◆ Advantages of hot runner system
(1) No nozzle material, no post-processing is required, so that the entire molding process is fully automated, saving working time and improving work efficiency.
(2) The pressure loss is small. The temperature of the hot runner is equal to the temperature of the injection nozzle of the injection molding machine, which avoids the surface condensation of the raw material in the runner and the injection pressure loss is small.
(3) The repeated use of nozzle materials will degrade the performance of plastics, and the use of hot runner system without nozzle materials can reduce the loss of raw materials and thus reduce product costs. The temperature and pressure in the cavity are uniform, the stress of the plastic parts is small, and the density is uniform. Under a lower injection pressure and a shorter molding time, a better product is injected than the general injection system. For transparent parts, thin parts, large plastic parts or high-demand plastic parts, it can show its advantages, and it can produce larger products with smaller models.
(4) The hot nozzle adopts standardized and serialized design, equipped with various nozzle heads for selection, and has good interchangeability. The uniquely designed and processed electric heating ring can achieve uniform heating temperature and long service life. The hot runner system is equipped with hot runner plates, thermostats, etc., with exquisite design, various types, convenient use, stable and reliable quality.
◆ Disadvantages of hot runner system
(1) The closing height of the overall mold is increased. Due to the addition of hot runner plates, the overall height of the mold has increased.
(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 problem that needs to be solved.
(3) There is thermal expansion, and thermal expansion and contraction are issues to be considered in our design.
(4) Increased mold manufacturing costs and higher prices of standard accessories for hot runner systems have affected the popularity of hot runner molds
