| 摘要 |
PROBLEM TO BE SOLVED: To prevent a temperature difference between the surface of a mandrel and an outer die from becoming large. SOLUTION: In a method for extrusion molding of a thermoplastic resin tube wherein thermoplastic resin is extruded in the shape of the tube from a circular gap between a mandrel 12 and an outer die 11, a mold 1 for extrusion molding which is equipped with the mandrel 12 provided with a through hole 121 located in proximity to the outer surface of the mandrel 12, one end of the through hole 121 of the mandrel 12 being made to communicate with a pass hole 131 provided in a spider 13 and the other end being opened in the end face of the mandrel 12, is used and the mandrel 12 is cooled by making a fluid flow through the through hole 121 thereof. |
