In industrial production, various presses and special tools installed on the presses are used to make metal or nonmetal materials into parts or products with required shapes through pressure. This special tool is collectively called the mold. Making plastic hollow balls by hollow molding.
Firstly, the tubular plastic parison is extruded, clamped into the mold, compressed air is introduced with a blowing needle, and the parison is inflated to make it cling to the inner wall of the mold, and the plastic hollow ball is obtained after cooling and shaping.