TIRE VULCANIZING BLADDER, TIRE VULCANIZING-FORMING METHOD, AND PNEUMATIC TIRE

摘要

The bladder for vulcanizing tires having a plurality of first air-release grooves (52a) provided on the outer surface of a bladder body (52) and each formed so as to extend from one to the other of the tire circumferential direction and extend toward one side of the tire-width direction, and a plurality of second air-release grooves (52b) provided on the outer surface of a bladder body (52) and each formed so as to extend from one to the other of the tire circumferential direction and extend toward the other side of the tire-width direction. By this, the outer surface of the bladder body (52) is divided into a plurality of areas (DB) by each of the air-release grooves (52a, 52b). Also, the vertexes (TP) of each of the areas (DB) are angular toward the tire-circumferential direction. Therefore, the pressure contact between each of the areas (DB) and the inner surface of the tire is easily released starting at the said vertexes (TP) of each of the areas (DB) as release starting points.