Circulating high-temperature, high-pressure nitrogen within tire curing molds is an essential process for the production of radial tires.


This technique centers on five key advantages
Uniform High-Temperature Heat Transfer for Thorough Curing: Nitrogen facilitates stable heat transfer and ensures uniform heating across the tire structure—including the tread, sidewalls, and bead areas—resulting in consistent vulcanization. This minimizes the formation of bubbles and under-cured spots, thereby enhancing the tire's wear resistance.
Elimination of High-Temperature Rubber Oxidation and Aging: Rubber is highly susceptible to thermo-oxidative aging, becoming tacky and prone to delamination when exposed to air at high temperatures. Nitrogen acts as an inert barrier, effectively isolating the rubber from oxygen; this results in a denser tire carcass that is far less likely to crack or develop bulges.
Internal Nitrogen Pressurization for Precise Shaping: By filling the curing bladder with high-pressure nitrogen, the tire carcass is uniformly expanded and held taut. This ensures that the tread patterns are fully formed and the edges are sharply defined, resulting in a tire with more precise dimensions that is less prone to deformation during high-speed driving.
Prevention of Internal Delamination, Sponginess, and Defects: The rubber vulcanization process can generate internal moisture and oil vapors. Nitrogen, being an inert and dry gas, effectively purges these moisture and gas residues. This leaves the tire's interior surface smooth and clean, significantly reducing the rate of defective tires.
Enhanced Safety and Extended Bladder Lifespan: Unlike steam—which contains moisture that can corrode the curing bladder—nitrogen is a dry and clean medium. This extends the service life of the curing bladder by more than double. Furthermore, as an inert and non-flammable gas at high temperatures, nitrogen contributes to a safer workshop environment.