Extrusion head for extruding a high viscous melting covering element of a covered core wire

Abstract

There is provided an extrusion head that is capable of largely increasing a production speed rather than a conventional head that extrudes supplies a high viscous melt-coating composition. In an extrusion headthat comprises a die ringhaving an exit portionand a nipplearranged in vicinity of the exit portion, whereby a core wire passageis provided to an inside of the nipplein an axial direction, and a high viscous melt-coating composition is pressure-fed into a space, which is formed by the die ringand the nipple, toward the exit portionwhile drawing out a core wire W from the core wire passage to the exit portion, and thus a cord-like coated core wire is extruded from the exit portionof the die ring while coating the core wire W with the high viscous melt-coating composition, a stagnation reservoir of the high viscous melt-coating composition is provided in vicinity of the exit portion by providing a wall surfaceperpendicularly to a proceeding direction of the core wire W at the exit portion