There are two kinds of plastic shell pepper balls: hollow PVC pepper balls and solid PVC pepper balls. There are two kinds of manufacturing processes of plastic PVC time balls, one is injection molding process and the other is vinyl molding process. Plastic PVC pepper balls manufactured by injection molding process are basically solid PVC pepper balls, while those manufactured by vinyl molding process are basically hollow PVC pepper balls.Plastic PVC pepper ball injection molding process manufacturing must first produce the molded plastic ball mold. PVC material is elastic and has a large shrinkage rate. When making PVC mold, it is necessary to calculate the shrinkage rate of PVC material, and then make the corresponding plastic pepper ball shell mold cavity according to the shrinkage rate. In addition, PVC material is acidic and corrosive to mold steel, so the steel used to make the mold should be made of corrosion-resistant materials.Plastic PVC pepper ball vinyl molding process should also produce vinyl mold. Plastic PVC pepper ball molding is generally used to manufacture PVC hollow balls, because PVC hollow balls cannot be manufactured by blow molding process. The advantage of vinyl molding process is that the density and wall thickness of PVC hollow balls can be adjusted according to needs. PVC plastic hollow balls are mainly used as elastic hollow balls for children to play with.