| 摘要 |
PROBLEM TO BE SOLVED: To form a stripe groove, which contributes to the smooth discharge of air and extends in a radial direction, to the surface on one side in the thickness direction of a bead filler material, which is formed by winding and laminating a ribbon-shaped rubber strip and has an annular shape as a whole, accompanied by the completion of the manufacture of the bead filler material. SOLUTION: The ribbon-shaped rubber strip 4 is wound around and laminated to the periphery of the bead core 3, which is concentrically arranged on a rotary substrate 1, in a vortex form and the stripe groove, which is formed by the transfer of the ridge 2 provided to the rotary substrate 1 so as to extend in a radial direction, is formed to the contact surface with the rotary substrate 1 over the whole periphery thereof. COPYRIGHT: (C)2008,JPO&INPIT
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