According to different casting system, plastic mold can be divided into three types:
(1) the gate of mould, the runner and gate on the parting line, together with the product in the mould stripping, the simplest design, easy processing, low cost, so more people using gate system operation.The plastic mold structure is divided into two parts: dynamic and fixed modes.The activity part of the injection machine is the dynamic mode (mostly the ejector side), and the injection terminal is usually not active.Because the mold part of the large nozzle is generally composed of two steel plates, it is also called "two plates".The two - plate mold is the simplest structure in the large water mouth mould.
(2) nozzle mould: the runner and gate is not the parting line, generally directly on the product, so to design a set of shuikou parting line, design is relatively complex, processing more difficult, often depending on the product requirements to choose fine runner system.The mould part of the thin nozzle is generally composed of three pieces of steel plate, and the mould is called "three plate mold".The three - plate mold is the simplest structure in the thin - water mouth mold.
(3) the hot runner mold: this kind of mold is approximately the same structure and fine shuikou, the biggest difference is that flow into one or more of the temperature of heat flow but and heat pumping mouth, no cold feeding demoulding, runner and gate directly on the product, so the port don't need mold release, also known as no runner system, this system can save raw materials, applicable to the raw material is more expensive, high requirement of products, design and processing difficulties, mould cost is high.Hot runner system, also known as hot runner system, mainly consists of hot sprue jacket, hot runner plate and temperature control box.Our common hot runner system has single point hot gate and multi-point hot runner.The single point hot gate is a single hot runner, which is used to insert the molten plastic into the cavity directly.The multi-point hot gate is used to separate the melt material from the hot runner to the heat gate sleeve and then into the cavity. It is suitable for single cavity multi-point feeding or multi-cavity mold.