Blow molding is a common process used for manufacturing hollow plastic products, primarily divided into three types: extrusion blow molding, injection blow molding, and stretch blow molding. The basic principle involves placing a molten plastic parison into a mold, using compressed air to inflate it so that it conforms to the mold cavity wall, and then cooling and shaping it to obtain a hollow product. This process offers high production efficiency and low cost, and is widely used in producing various bottles, pots, barrels, and industrial hollow components.