Dalian extrusion molding for thermosetting plastics, because they melt at a certain temperature and quickly become solid, it is difficult to form them by pneumatic expansion. The development of hollow forming technology is of great help to reduce the production cost of plastic products, so as to better protect the rights and interests of consumers. The variety of products has increased and the level of automatic control has also improved.

There are more and more models controlled by microcomputer, but generally speaking, most of them have a volume of less than 2.5L, and the process is mainly extrusion blow molding (extrusion blow molding) and billet injection blow molding (injection blow molding). Among them, relay controlled models and PLC controller models account for about 7O% of the total output.

Among many molding methods of hollow products, blow molding and injection molding are two widely used molding methods with large output, and most plastic containers are blow molding, such as various types of bottles, cans, barrels, storage tanks, etc. This paper mainly expounds the production technology status and development trend of extrusion blow molding machine, blank injection blow molding machine and blank drawing blow molding machine for blow molding.

With the development of construction industry and plastic industry, the plastic industry has become a sunrise industry in China. In recent years, the annual output of plastic products has increased by more than 10%. It is expected that by 2012, the output of plastics in China will reach 65 million tons, and the annual growth of plastic machinery driven by the plastic industry will be more than 30%.