Classification of injection mould runner system:
When we carry out the injection molding of injection molds, we use many methods. According to the type of runner system, molds can be divided into the following three categories:
Hot runner molds
This type of mold structure is the same as a fine nozzle. The biggest difference is that the runner is located in one or more constant temperature hot runner plates and hot joints. There is no cold material removed from the mold, and the runner and gate are directly on the product, so the runner does not need to be released from the mold. This system is also called a waterless system, which can save raw materials. It is suitable for cases where raw material prices are high and product quality requirements are high. This type is difficult to design and process, and it is also costly.
The hot runner system is mainly composed of hot runner sleeves, hot runner plates, and temperature control electrical boxes. The hot runner system we often see has two forms of single hot runner and multiple hot runners. The single-point hot runner uses a single hot runner sleeve to directly inject molten plastic into the cavity. It is suitable for single-cavity single-gate plastic molds. Multiple-point hot runners are used to divide molten materials into each hot gate through the hot runner plate. The sub-additional hot runner sleeve enters the cavity again, which is suitable for single-cavity multi-point or multi-cavity molds.
Large gate molds
The gate and runner of large gate molds are located on the parting line and are released together with the product when it is opened. This design is the simplest, easy to process and has low costs. Therefore, more people use the large nozzle system operation.
The runner and gate of fine nozzle are not on the parting line. Usually, they are directly on the product. Therefore, it is necessary to design a multi-sub-insertion line. The design is more complicated, and the processing is more difficult. Usually, a fine water outlet system is selected according to the product requirements.