Over the past 20 years of reform and opening up, China's plastic packaging industry has developed steadily and rapidly. It has developed from an initial decentralized industry to an independent modern industrial system with complete product categories.

Three layer coextrusion film blowing machine is a machine that heats and melts plastic particles and then blows them into films. The film blowing machine is suitable for all kinds of high-grade film packaging. The film can be widely used in light and heavy packaging because of its good barrier, fresh preservation, moisture prevention, frost prevention, oxygen isolation and oil resistance. Such as all kinds of fresh fruits, meat food, pickles, fresh milk, liquid drinks, medical supplies, etc.

In industry, there are two kinds of production methods of plastic film (thickness: 0.005mm-0.250mm) - calendering method and extrusion method. The extrusion method is divided into extrusion film blowing machine, extrusion drawing and extrusion casting. At present, the most widely used production processes include extrusion film blowing, extrusion drawing and extrusion casting, especially polyolefin film, while calendering is mainly used in the production of some PVC films. In extrusion film blowing, extrusion drawing and extrusion casting, due to the continuous improvement of the overall manufacturing technology of extrusion film blowing equipment and the relatively low cost compared with drawing and casting equipment, the application is increasing.

With China's entry into WTO and economic globalization, the fierce competition in the market and the improvement of people's living standards, it is the general trend for people to pursue spiritual and material civilization and pay attention to internal quality. Many people begin to accept the packaging concept of paying attention to function and light appearance in developed countries, and yearn for pollution-free sanitary packaging and decoration, This is undoubtedly a good opportunity for the development of multi-layer co extruded plastic film and blow molding equipment.

It is predicted that by 2005, China's annual market demand in the field of plastic packaging materials will reach 5.5 million tons, with an average annual demand growth rate of 10%. It has the fastest growth rate in the plastic products industry and is a sunrise industry with broad development prospects. Among them, film is the most used plastic packaging material. Due to its non-toxic, light weight, beautiful packaging and low cost, its application field is constantly expanding, almost penetrating into all aspects of industrial and agricultural products and daily necessities. The investment in the plastic packaging film industry is growing rapidly.