Patent ID: 7323055
Filing Date: 2008-01-29
Classification: B29C,B29L,H01B,Y10S

Abstract:
1. An extrusion head comprising: a die ring having an exit portion and a nipple arranged in vicinity of the exit portion, whereby a core wire passage is provided to an inside of the nipple in an axial direction, and a high viscous melt-coating composition is pressure-fed into a space, which is formed by the die ring and the nipple, toward the exit portion while drawing out a core wire from the core wire passage to the exit portion, and thus a cord-like coated core wire is extruded from the exit portion of the die ring while coating the core wire with the high viscous melt-coating composition, wherein a stagnation reservoir in which the high viscous melt-coating composition is stagnated is constructed in the space that is formed by the die ring and the nipple in vicinity of the exit portion, and wherein the stagnation reservoir is constructed by forming a wall surface of the exit portion into stepwise shapes on an oblique surface that becomes narrow along a proceeding direction of the core wire at the exit portion.