Zipper machine is composed of injection system, clamping system, hydraulic transmission system, electrical control system, belt feeding auxiliary system, heating and cooling system, safety monitoring system, etc.

Function of injection system: Injection system is one of the main components of injection molding machine. Generally, there are three main forms: plunger type, screw type and screw pre-plastic plunger injection type. At present, screw type is widely used. Its function is to heat and plasticize a certain number of plastics in a specified time in a cycle of the injection machine, and then inject molten plastics into the mould cavity through screw under a certain pressure and speed. After the injection, the melt injected into the cavity is kept in shape. Composition of injection system: injection system consists of plasticizer and power transfer device.

The function of the closing system: The function of the closing system is to ensure the closing, opening and ejecting of the die. At the same time, after the die is closed, enough clamping force is provided to resist the pressure of molten plastics entering the die cavity, prevent the die from opening, and cause the bad status of the products.

The function of hydraulic transmission system: realizing the power supply of injection moulding machine according to various actions required by the process, and meeting the requirements of pressure, speed and temperature required by each part of injection moulding machine. It is mainly composed of various hydraulic components and hydraulic auxiliary components, in which oil pump and motor are the power source of injection moulding machine. Various valves control the hydraulic pressure and flow rate of oil to meet the requirements of injection moulding process.

Reasonable coordination between the electric control system and the hydraulic system can realize the technological process requirements (pressure, temperature, speed, time) and various program actions of the injection machine. It is mainly composed of electrical appliances, electronic components, instruments, heaters, sensors and so on. Generally there are four control modes, manual, semi-automatic, automatic and adjustable.

Function of heating system: Used to heat the barrel and injection nozzle, the barrel of injection moulding machine generally uses electric heating coil as heating device, which is installed outside the barrel, and is detected by thermocouple in segments. Heat conduction through the cylinder wall provides heat source for material plasticization; cooling system is mainly used to cool oil temperature, oil temperature too high will cause a variety of faults, so oil temperature must be controlled. The other place where the cooling is needed is near the feeding pipe outlet, which prevents the raw material from melting at the feeding pipe outlet, thus causing the raw material to be unable to discharge normally.