4. Injection blow molding
Injection blow molding is a blow molding method. The plastic is first formed into a bottomed parison by injection molding, and then moved into a blow mold to be blown into a hollow product.
This method can produce packaging containers for daily necessities, cosmetics, medicines, foods, etc., but the volume should not exceed 1L. Commonly used plastics are polyethylene, polystyrene and polyvinyl chloride.
5. Extrusion blow molding
Extrusion blow molding is a blow molding method. Unlike injection blow molding, its parison is manufactured by extrusion.
6. Stretch blow molding
Stretch blow molding is a blow molding method. It is formed by extrusion, injection molding, etc., and then the parison is heated to the stretching temperature. The longitudinal stretching is carried out by mechanical action of an internal (e.g., a mandrel) or an external (e.g., a jig), and at the same time or later, by compression of the compressed air, transverse stretching is performed.