Blow molding mainly refers to hollow blow molding (also known as blow molding), which is a rapidly developing plastic molding method that uses gas pressure to blow and expand a hot melt billet closed in a mold to form a hollow product. The molds used for blow molding are only female molds (concave molds), which have lower equipment costs, stronger adaptability, good formability (such as low stress), and can form products with complex undulating curves (shapes) compared to injection molding.
The commonly used raw materials for blow molding include polyolefins such as PE, PP, and PVC, as well as engineering plastics such as PA and PC. Electrical materials include elastomers, among which PE plastic is the most commonly used. The blow molding process can not only be used to shape bottles of various sizes and shapes that contain liquids and medicines, children's toys, hot water bottle shells, etc. in daily life and industry, but also to shape various complex hollow industrial components, especially those in the automotive industry. The application scope of blow molded products includes automobiles, office equipment, household appliances, medical, entertainment appliances, furniture, and other aspects. Among them, the plastic fuel tank for automobiles is a recently produced hollow blow molded automotive component,
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. There are various new processes in blow molding, such as 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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