BLADDER

• Main Authors: FUKUMOTO HIROHIKO, FUJIEDA YASUHIKO, FUJISAWA KAZUHISA, SAKURAI AKIRA, MITAMURA HISASHI
• Format: Patent
• Language: English
• Published: 21.11.2000
• Edition: 7
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; PERFORMING OPERATIONS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

PROBLEM TO BE SOLVED: To provide a bladder which hardly generates variations in the shape of a tire inner wall face and at the same time reduces the replacement frequency, even when the number of times of repeating a vulcanization molding is increased. SOLUTION: In the vulcanization-molding of a green tire 4, the tire inner wall face is pressed in the mold direction by supplying a pressurizing medium. The bladder has a constituent member made of a low stretchability material whose properties are hardly changeable under high temperature environments, and the molding is made almost in the same shape as the shape of the tire inner wall face, when the green tire 4 is vulcanization-molded into a vulcanized tire. The low stretchable material is formed of a knit or a fabric, which is formed of one or more kinds of fiber selected from fibers such as nylon, polyester, aramid, and a paraphenylene benzobisoxazole (POB), a metal cord material, a carbon-filled fiber, a metal-coated fiber and a resin-coated fiber.