This utility model discloses a composite runner of a die head of an extrusion blow molding machine, comprising a main flow groove, a hanger groove and a spiral groove formed on a mandrel; the main flow groove is in communication with a plastic melt inlet on a cylinder body, the lower end of the main flow groove is in communication with the hanger groove, and the hanger groove is in communication with the spiral groove through a first runner gap; a relaxation section is arranged below the spiral groove.
After passing through a section of hanger runner and a spiral runner surrounding the mandrel, the plastic melt in the utility model undergoes two times of runner distribution, so that the melt distribution is more uniform; the plastic melt exerts the dual effects of stretching and relaxation through the first relaxation section and the second relaxation section, which improves the quality of the blow-molded parison and greatly increases the qualified rate of qualified blow-molded parisons.
Country Code: CN
Application Number: CN202022205571.2
