Plastic mold, also known as injection mold, is a device that produces (often in large quantities) plastic parts or products by forming a cavity (one or more) assembled to form the desired shape of the product.
The mold cavity is composed of a female mold part called the mold cavity and a male mold part called the mold core. The mould is installed on the injection machine and the cavity is filled in the following chronological (usually automatic) sequence:
1, the clamping
2, Injection (hot, nearly flowing) plastic into the cavity
3. Keep the mold closing state until the plastic cools to the point where it can be ejected
4, open mould
5. Eject the plastic products
6. If necessary, the injection molding machine can extend the open mold (MO) time to prepare for the next (injection) cycle.

According to the different type of gating system, molds can be divided into three categories:

(1) Large nozzle mold: the runner and gate are on the mold dividing line and demoulded together with the product when the mold is opened. The design is the simplest, easy to process and the cost is low, so more people use the large nozzle system to operate.
(2) fine nozzle mold: the runner and gate are not on the parting line, and they are generally directly on the product, so it is necessary to design one more group of outlet parting line. The design is more complex and the processing is more difficult. Generally, the fine nozzle system should be selected according to the product requirements.
(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 higher.

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