The vulcanizing bladder is a hollow thin-walled rubber product of the tire vulcanizer, which is specially designed to be filled into the inner cavity of the tire blank to be vulcanized. During the vulcanization process, a heating medium (such as hot air or steam) is introduced into the bladder, and the tire is shaped and vulcanized with a vulcanizer. Agricultural and engineering tire vulcanization capsules refer specifically to capsules used in the vulcanization process of agricultural tires and engineering tires.

According to the structure of the vulcanizer and the type of tire, the vulcanizing bladder can be divided into many types. In the field of agricultural and engineering tires, common types of curing bladder may include Type A, Type B, and Type AB, etc. Among them, A- type capsules may be divided into barrel-shaped capsules for bias tires and orange-shaped capsules for radial tires to meet the vulcanization needs of different tires.

Shape retention: The curing bladder plays a supporting role inside the tire to ensure that the tire maintains the correct shape and size during the curing process.
Vulcanization medium: The heating medium in the bladder serves as a vulcanization medium to promote the vulcanization reaction of the tire material by heating and pressurizing.
Improve quality: The use of vulcanization capsules can significantly improve the vulcanization quality and consistency of tires, and enhance the wear resistance, impact resistance and service life of tires.