Blow molding mainly refers to hollow blow molding (also known as blow molding), which is a method of using gas pressure to blow and expand the hot melt blank closed in the mold to form hollow products. It is a rapidly developing plastic molding method. The only mold used for blow molding is the female mold (concave mold). Compared with injection molding, it has lower equipment cost, stronger adaptability, good formability (such as low stress), and can form products with complex undulating curves (shapes)< The commonly used raw materials for blow molding include polyolefins such as PE, PP, PVC, as well as engineering plastics such as PA and PC, while electricity includes elastomers. Among them, PE plastic is the most commonly used. Blow molding technology can not only be used to shape various sizes and shapes of bottles, children's toys, hot water bottle shells, etc. that contain liquids and medicines in daily life and industry, but also to shape various complex hollow industrial components, especially in the automotive industry. The application scope of blow molding products involves automobiles, office equipment, household appliances, medical, entertainment equipment, furniture, and other aspects. Among them, the plastic fuel tank for automobiles is a hollow blow molded automotive component with a large production volume recently. Production began in 1973 and by 2000, it had accounted for 90% of the entire automotive fuel tank market. In recent years, blow molding technology has developed faster, from single-layer blow molding to double-layer and multi-layer blow molding. Various new processes have emerged in blow molding, including extrusion blow molding, injection blow molding, and extrusion or injection stretch blow molding. Computer simulation technology has also played an increasingly important role in blow molding processes, and computer CAE/CAM technology is becoming increasingly mature. Blow molding technology is developing towards producing larger and more diverse hollow products, as well as faster production speed and higher quality
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