Hot runner systems utilize heating methods to ensure that the plastic in the runner and gate remains in a molten state. Due to the presence of heating rods and heating coils near or in the center of the runner, the entire runner, from the nozzle outlet of the injection molding machine to the gate, is maintained at a high temperature, keeping the plastic in the runner molten. Generally, there is no need to open the runner to remove solidified plastic after shutdown, and when restarting, only the runner needs to be heated to the required temperature. Therefore, hot runner technology is sometimes referred to as a hot manifold system or no-runner molding.

Hot runner in injection mold refers to a component system in which the runner and gate plastics are kept molten by heating. It does not need to remove the runner and runner each time forming, thus saving materials, improving production efficiency and product quality. Hot runner mold is widely used in the production of plastic products, and the stacked hot runner mold is an important development direction.

Hot runner technology is a key part of injection molding, and its injection pressure loss and operation process are very important. This article will explore these points in depth, and share the experience of solving production problems such as viscose, to help the injection molding industry upgrade technology.