As an important equipment for plastic molding, plastic extruder uses external power transmission and heat transfer from external heating elements to convey, compact, melt, shear, mix and extrude plastics.

China has three main characteristics for the plastics industry. First, the industry's attention to high-efficiency and energy-saving technologies is increasing. Energy-saving, high-efficiency and high-yield extruders have become an important direction of technological innovation; second, food, beverages, and new energy. The industrial sector's demand for high-performance flexible packaging films continues to rise, and the multi-layer co-extrusion technology of plastic films is constantly being introduced. Third, China's extrusion technology has begun to increase research and development in the fields of various supporting parts and auxiliary equipment, and the application of new technologies The pace of expansion is accelerated, which promotes the rapid improvement of the overall technical level.

Plastic extrusion equipment is also constantly improving. During operation, heating, pressure and shearing are used to transform solid plastic into a uniform melt, and the melt is sent to the next process. The production of melt involves The process of mixing additives such as color masterbatch, blending resin and pulverizing. The finished melt must be uniform in concentration and temperature. The pressure must be large enough to extrude the viscous polymer.

The extruder completes all the above processes through a barrel with a screw and spiral passage. The plastic pellets enter the barrel through a hopper at one end of the barrel, and then are conveyed to the other end of the barrel through the screw. In order to have sufficient pressure, the depth of the thread on the screw decreases as the distance to the hopper increases. External heating and internal heat generated by friction between the plastic and the screw make the plastic soft and melt. Generally, different polymers have different applications. The plastic extruder is designed to discharge outlets, multiple feeding ports, and along the screw. Special mixing device, cooling and heating of the melt, external heat source, the relative size of the gap between the screw and the barrel, and the number of screws.