Provided is a pneumatic tire including an indicator made of a protrusion portion or a recess portion extending in a tire circumferential direction is formed on a tire inner surface. A sound absorbing member or a sealant layer is applied to the tire inner surface along the indicator.

Provided is a tire vulcanizing bladder comprising fluororubber, wherein a plurality of grooves extending in a width direction are formed on a circumference of an outer surface of the tire vulcanizing bladder, and a plurality of recesses connecting the grooves to each other are formed between the grooves. Also provided is a pneumatic tire comprising one or more fluorine-containing particles having a maximum diameter of 1.0 ?m or more per area of 100 ?m.sup.2 of a tire inner surface, wherein a plurality of bladder ridges extending in a tire width direction are formed on a circumference of the tire inner surface, and a plurality of protrusions connecting the bladder ridges to each other are formed between the bladder ridges.

A vulcanizing bladder 3 comprises a first bladder 11 configured to contact with an inner circumferential surface of an unvulcanized tire (T) and a second bladder 12 arranged inside the first bladder 11. A first fluid G1 is to be supplied between the first bladder 11 and the second bladder 12, and a second fluid G2 is to be supplied to an inside of the second bladder 12. At least one of an inner circumferential surface 11s of the first bladder 11 and an outer circumferential surface 12s of the second bladder 12 is provided with a guide groove 31 extending in a tire axial direction through which the first fluid G1 can pass.

A method and a device for vulcanizing tires. An expandable bellows is used for pressing the tire being vulcanized against segments of a mold. The bellows is arranged on a carrier which has an annular shape.

A rubber composition for a bladder used for manufacturing a bladder for vulcanizing tire, in which 1 to 5 parts by mass of a polymer having a weight average molecular weight Mw of 1,000,000 or more is blended in 100 parts by mass of a rubber component containing butyl rubber as a main component, and a method for manufacturing a bladder for vulcanization of tires characterized in that the bladder for vulcanization of tires is manufactured by an extrusion molding and an injection molding of a rubber composition for a bladder, in the rubber composition for a bladder, 1 to 5 parts by mass of a polymer having a weight average molecular weight Mw of 1,000,000 or more is blended with 100 parts by mass of a rubber component containing butyl rubber as a main component, and the injection molding of the rubber composition for a bladder is carried out while performing vacuum suction.

A method of lubricating an expandable rubber bladder is described for use during a vulcanization of a green tire within a metal press. The method can include applying compositions in the form of emulsions of silicone oils to the inner surface of the green tires and/or to the outer surface of the vulcanization bladders to facilitate the molding-demolding thereof during the manufacture of the tires.

A tire holding device of a tire mounting machine grasps the bead section of a green tire by chucking paddles and places the green tire around an upright cylindrical vulcanization bladder. A bladder device of the tire mounting machine expands the vulcanization bladder to press same against the inner surface of the green tire, and sets the green tire in a vulcanization-mold. On a lower portion of each chucking paddle, guide extensions are formed to extend in the two circumferential directions. Between adjacent chucking paddles, the guide extensions extend toward each other and constantly overlap each other to prevent the expanding vulcanization bladder from contacting the radially inner surface of the bead section and from stripping the non-vulcanized rubber of the green tire.

Provided is a tire vulcanizing method enabling an optimum vulcanization operation for each tire by measuring the temperatures of the inner surface and the outer surface of a tire until the demolding timing without damaging the tire and by determining the vulcanized state of the tire accurately based on the measured temperature data to efficiently produce uniformly vulcanized tires especially under conditions where the temperature of a mold fluctuates. During vulcanization of a tire G, the temperatures of the inner surface and the outer surface at a plurality of principal portions representing the tire G are measured, and the demolding timing is determined according to the equivalent degree of vulcanization indicating the degree of progress in crosslinking reaction calculated based on the temperature data measured.

A system and method for molding complex three-dimensional articles is disclosed. The system includes a mold for receiving an article made of at least one moldable material and, in one example, the article comprises at least one flat region and at least one radial region. The mold comprises an inner bladder that conforms to an inner surface of the article when pressurized and an outer mold that contacts an outer surface of the article. The system also includes an inner electrode spaced from an outer electrode, and a generator operable to generate an alternating electric field between the electrodes and across the article in the mold to obtain substantially even heating of the moldable material in the flat region and the radial region at the end of the heating cycle.

The present invention relates to the fields of tire vulcanizing machines and rubber vulcanizing apparatuses, in particular to tire vulcanizing equipment, comprising a mold assembly, a ring seat assembly provided in the mold assembly, a cylinder assembly supporting the ring seat assembly, a sealing hood for sealing a gas in the mold assembly, and a driving member. A gas circulating fan is provided on the ring seat assembly; a rotating shaft for driving the gas circulating fan to rotate is provided in the cylinder assembly; the driving member drives the rotating shaft to rotate; and the sealing hood isolates the driving member, such that high-temperature and high-pressure gas in the mold assembly cannot damage the driving member, thereby increasing the service life of the driving member.