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

摘要

Disclosed is a tire vulcanizing bladder comprising a plurality of first bleeder grooves (52a) so formed on the outer surface of a bladder body (52) as to extend in one tire width direction from one to the other of tire circumference directions and arranged at a first predetermined spacing (L1), and a plurality of second bleeder grooves (52b) formed to extend in the other tire width direction from one to the other of the tire circumference directions and arranged at a second predetermined spacing (L2). Moreover, the second predetermined spacing (L2) is 1.2 times to 4.5 times as large as the first predetermined spacing (L1). Thus, the outer surface of the bladder body (52) is defined by the individual bleeder grooves (52a and 52b) into a plurality of regions (DB), which have their individual tops (TP) bulging in the tire circumference directions. As a result, the contact between the bladder body (52) and the inner surface of the tire is easily released from the starting points of the tops (TP) of the individual regions (DB).