| 摘要 |
PURPOSE: A mold for manufacturing a joint pipe for waterworks, a joint pipe using the mold and a method for manufacturing the joint pipe are provided to maintain the airtight seal at joints of water pipes because more resin is fused on the joints. CONSTITUTION: A mold for manufacturing a joint pipe for waterworks comprises a pair of outer cores(10), first and second inner cores(12,14), a molding cavity(16), an airtight seal retaining piece(24), a stopper(18), a heat insulator, and a heat storage unit. The outer cores are in semicircular shape and selectively coupled with each other. The first and the second inner core are arranged separately inside the outer cores. The molding cavity is formed between the inner surface of the outer cores and the outer surface of the first and the second inner core. The airtight seal retaining piece is airtightly connected to the lower inner surface of the outer cores. The stopper is pressed in the molding cavity to cover the top of the first inner core. The heat insulator is attached to the outer surface of the outer cores. The heat storage unit is formed on the inner surface of the inner core.
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