MANUFACTURE OF ELECTRIC WIRE PROVIDED WITH ROTATION FIN IN CONTINUOUSLY EXTRUDING CROSS-LINKING APPARATUS

PROBLEM TO BE SOLVED: To prevent high temperature steam and a high temperature and high pressure gas from leaking out of an interface of a rotation part by manufacturing an electric wire provided with a rotation fin while sealing the interface between mutually rotating a rotation die having a fin forming groove and a head of an extruding apparatus by pouring a lubrication material to the interface. SOLUTION: In manufacturing electric wires provided with a rotation fin, a lubrication material pouring route 91 is formed in a plug 9 for coming out prevention and the outlet of the route 91 is set to be a tip end face for screwing the plug itself and opened toward the interface between a head 2 of an extruding apparatus and a rotation die 3 having a fin forming groove where both of the head 2 and the die 3 are relatively rotated. A lubrication material 23 is poured into the interface between the head 2 of an extruding apparatus and the rotation die 3 having a fin forming groove where both of the head 2 and the die 3 are relatively rotated by continuously pouring the lubrication material 23 into the route 91 and the interface of the relatively rotating parts where a gap is easily formed is constantly sealed. Consequently, in the case a cross-linking work is carried out, high pressure steam in a crosslinking cylinder 8 can be prevented from leaking out of the interface through a communication cylinder 5.