Tianjin Saixiang Science and Technology Co., Ltd. announced on March 20 that it has successfully developed a one-shot molding machine for the 49/51-inch all-steel giant radial tires, specifically designed for its European tire company to produce the 33.00R51 model. This is the first single-stage giant radial tire building machine in the world, featuring complete independent intellectual property rights. The breakthrough not only fills a domestic gap but also marks a significant global advancement. It demonstrates that China's production equipment for giant radial tires has reached international standards and highlights a major leap in China's rubber machinery industry from "Made in China" to "Created in China."
Molding machines are considered the most critical core equipment in the production of giant radial tires. Currently, only a few global tire giants, such as Michelin, Bridgestone, Goodyear, and Yokohama, possess the technology and equipment for producing such tires. Their molding processes typically involve two stages, and the related technologies are strictly protected as trade secrets. In recent years, several Chinese rubber machinery companies have attempted to develop similar equipment, but they have largely relied on foreign designs and adopted multi-step methods.
Tianjin Saixiang, however, chose a different path. By focusing on original innovation, the company developed a one-step molding system without any prior reference or external information. After nearly two years of dedicated research and development, it not only broke the foreign monopoly but also set a new precedent for the creation of advanced rubber machinery in China.
The newly developed equipment spans approximately 1,500 square meters, stands up to 9.2 meters tall, and weighs around 800 tons. It uses computerized control and closed-loop systems throughout the entire process, with all molding operations carried out on a rail, ensuring high precision and quality. According to inspections, the giant radial tires produced by this machine have a diameter of about 3 meters, with a perimeter error of just 0.72 millimeters and a weight error controlled within 1.5%. These performance metrics fully meet the required technical specifications.
During the R&D phase, the project addressed numerous technical challenges, including the manufacturing of molding drums, spindle material formulations, and capsule turn-up techniques. As a result, more than ten invention patents were filed. When the machine successfully completed the final turn-up action of the giant radial tire capsule, the team celebrated with great enthusiasm.
Industry experts believe that the successful development of this world-leading one-shot molding machine will provide strong support for China’s giant radial tires to gain a stronger foothold in the global market. The equipment has already received seven orders and has passed the European CE certification. This project has also been recognized as one of the top 20 industrialization projects for independent innovation in Tianjin this year.
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