Classification of pouring systems for molds

Plastic molds can be divided into three categories based on the different pouring system types:

(1) Large water outlet mold: The runner and gate are on the parting line and demoulded together with the product during mold opening. The design is simple, easy to process, and the cost is low, so many people use the large water outlet system for operation. The structure of plastic molds is divided into two parts: moving molds and fixed molds. The movable part of the injection machine is a moving mold (mostly on the ejection side), and the inactive part at the ejection end of the injection machine is generally referred to as a fixed mold. Due to the fact that the fixed mold part of the large nozzle mold is generally composed of two steel plates, this type of structural mold is also called a two plate mold. The two plate mold is a simple structure in the large water mouth mold.

(2) Fine nozzle mold: The runner and gate are not on the parting line, usually directly on the product. Therefore, it is necessary to design an additional set of nozzle parting lines, which is more complex in design and difficult to process. Generally, the selection of fine nozzle system depends on the product requirements. The fixed mold part of the fine nozzle mold is generally composed of three steel plates, so this type of structural mold is also referred to as the "three plate mold". The three plate mold is a simple structure in the fine nozzle mold.

(3) Hot runner mold: This type of mold has the same structure as a fine nozzle, but the difference is that the runner is located in one or more hot runner plates and hot pump mouths with constant temperature, without cold material demolding. The runner and gate are directly on the product, so the runner does not need demolding. This system is also known as a non nozzle system, which can save raw materials and is suitable for situations where raw materials are expensive and product requirements are high. It is difficult to design and process, and the mold cost is high. The hot runner system, also known as the hot runner system, mainly consists of a hot runner sleeve, a hot runner plate, and a temperature control electrical box. Our common hot runner systems come in two forms: single point hot gate and multi-point hot gate. Single point hot gate is a plastic mold that uses a single hot gate sleeve to directly inject molten plastic into the mold cavity. It is suitable for single cavity and single gate plastic molds; Multi point hot gate is a method of branching molten material into each sub hot gate sleeve through a hot gate plate and entering the mold cavity. It is suitable for single cavity multi point feeding or multi cavity molds.

(Literature selected from Baidu Baike)