What are the threads inside a tire called?
2 Answers
The threads inside a tire are called cord threads. Related introduction: 1. Viscose cord threads: Resistant to fatigue and heat, with good dimensional stability, but viscose cord threads have the disadvantage of being prone to moisture absorption, which reduces their strength after absorption. Mainly used in radial passenger car tires. 2. Polyamide cord threads: High strength, good impact and fatigue resistance, but poor dimensional stability and adhesion to rubber. When used, they must undergo dipping and thermal stretching treatment to improve their dimensional stability and adhesion. Widely used in tires for trucks, aircraft, as well as in belts and hoses. 3. Polyester cord threads: High strength, large initial modulus, good thermal shrinkage and dimensional stability, but they generate high heat during fatigue, are prone to amination and hydrolysis, which reduces their strength, and are difficult to bond with rubber. To improve adhesion, surface activation treatment and dipping are required. Widely used in passenger car tires. 4. Aramid cord threads: High strength and modulus, better high-temperature resistance and dimensional stability, but high cost and poor adhesion to rubber. Suitable for high-performance tires in luxury cars, military vehicles, aircraft, etc.
I've been driving for over 20 years, and those cords inside tires commonly called carcass plies or tire cords are usually made of steel wire or nylon fibers. They act like the skeleton of the tire, supporting the entire structure to prevent it from collapsing or deforming. If these cords break, the tire will develop a bulge and feel unstable when driving, becoming prone to blowouts at high speeds which is particularly dangerous. I've personally experienced this - once accidentally hitting a curb, later noticing a large bulge on the sidewall, and only learning during repair that the cords were damaged requiring replacement. I recommend regularly checking tire condition, especially slowing down when encountering potholes; maintaining proper tire pressure as per manual; avoiding overloading to reduce cord stress. Periodically inspect the tread surface for bulges, and choose reliable brand tires with better cord quality for longer lifespan. These small habits can significantly improve driving safety.
