Application Status of Textile Materials for Automotive Applications (III): Tire Cord

2024-01-25

Tire cord fabric is an automotive tire skeleton reinforcement material, accounting for about 10% to 15% of the total weight of the outer tire, which has a great impact on tire performance and life. Cord layer is usually made of multiple layers of rubber-impregnated cord bonded with rubber, which plays a role in enhancing the overall strength of the tire and stabilizing the outer tire. Tire cord technology content is high, the strength of the fiber, elongation, modulus of elasticity, adhesion to rubber, fatigue resistance, dimensional stability, heat resistance and impact resistance and other requirements are very high, its raw materials include nylon, polyester, viscose filament, para-aramid and steel wire and so on.

Nylon

Nylon has low modulus, poor creep resistance, high heat shrinkage, and its cord fabric is prone to the "flat spot" effect, leading to tire deformation, so it is not suitable for radial tire carcasses with high rigidity requirements. In order to improve its dimensional stability, DuPont (DuPont) developed a low linear density nylon 66 shaped fiber called Hyten, its cross-section is a rounded rectangle, the aspect ratio of about 3. The Netherlands National Mining Company has also developed a nylon 46 cord fabric, dimensional stability and heat aging resistance are better than ordinary nylon. China's Shenma Group developed a modified nylon 66 can also meet the requirements of cars and light radial tires. In addition, the use of low-twist nylon cord can also improve its "flat spot" problem.

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