Injection moulding machine has a plastic moulding machine with complex appearance, accurate standard or compact texture with metal inserts. It is widely used in national defense, electromechanical, car, transportation, building materials, packaging, agriculture, culture, education, health and people's daily life. The injection moulding process has excellent adaptability to various plastics processing tools, high production capacity, and easy to complete automation. Nowadays, with the rapid development of plastic industry, injection moulding machine occupies an important position in both quantity and variety, and then becomes one of the machines with fast growth and large output.

China's plastic processing enterprises are all over the country, and the technical level of equipment varies from good to bad. Most of the processing enterprises need technological transformation of their equipment. Over the past few years, the technology of plastic machine operation in China has made remarkable progress, especially the distance between the technology level of injection machine and foreign famous brand products has been greatly reduced, and remarkable improvements have been made in control level, product internal quality and appearance modeling. Choose domestic equipment, with a small input, the same can produce the same quality of imported equipment products. These have created conditions for technological transformation of enterprises.

Good products and equipment are needed. Wear and corrosion of equipment is a natural law. If people grasp this law, they can prevent or reduce the wear and corrosion of equipment, extend the operation cycle of equipment and ensure the intact rate of equipment.

In order to strengthen the operation, maintenance and treatment of plastic machinery, the relevant departments of our country have formulated relevant standards and implementation rules, requiring all equipment processing departments and production enterprises to handle and use the equipment scientifically, correctly, reasonably smooth, carefully maintained, regularly maintained, planned maintenance, running equipment intact rate, so that the equipment is often in excellent condition.

The injection system is the heart part of the injection moulding machine. Its function is to ensure that the material is heated and plasticized on time and quantitatively, and then inject the molten plastic equivalent to the amount of a single injection into the mould cavity at a relative pressure and a quick speed. After the injection, there is also a holding time to compensate a part of the melt shortened by cooling in the mould cavity, so as to make the product compact and avoid material reflux in the mould cavity. 。 Therefore, it is necessary for injection equipment to ensure that plastics are plasticized evenly and that injection pressure and pressure are satisfied. The needling equipment that can meet these requirements mainly includes plunger type, plunger-screw type and screw type.

Plastic injection moulding technology was developed from the end of 19th century to the beginning of 20th century on the basis of die-casting principle, and it is one of the widely used methods in plastic processing nowadays. This method is suitable for all thermoplastic plastics and some thermosetting plastics (about one third of the total plastics).