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The hot runner is heated to keep the plastics in the runner and gate molten. The heat flow channel system is generally composed of several parts, such as thermal nozzle, diverter plate, temperature control box and accessories. Hot nozzles generally include two types: open hot nozzles and needle valve type hot nozzles. Because the form of thermal nozzle directly determines the selection of heat flow channel system and the manufacture of mold, the heat flow channel system is usually divided into open heat flow channel system and needle valve type heat flow channel system.

Cold runner system at every time of mould can cause waste, at the time of injection molding parts, multiple cavity cold runner system will cause a lot of waste of raw materials, which makes the profit space molding is seriously damaged. The advantage of cold runner is that it is easy to use and can meet some aesthetic requirements. Cold runner can reduce injection to transparent acrylate or polycarbonate for light transmission and avoid visible band effects in some parts.

Generally speaking, rubber is thermosetting, plastic is thermoplastic. Thermosetting rubber becomes a high elastic state of solidification when heated to a certain temperature under certain pressure. Even if it continues to heat, it cannot change its state. In general, the waste of thermoset rubber is not recyclable. Most of the rubber injection mold runner system is a hot runner system, after injection, the flow in the system of rubber and rubber vulcanization at the same time, in the cavity when stripping out at the same time, apart from products as waste material after processing.