In a tire, the adhesive between fibre and the matrix requires resistance to the extreme temperatures, cyclic and compression loads, shock, creep and distortion.
Though polyester is an excellent reinforcement material to be used in carcass ply rubber compounds, adhesion between polyester cords and rubber in agricultural or industrial tires is often poor at best. (1)
The poor bondability of polyester fibers with rubber is attributed to the hydrophobic nature of fiber due to the limited number of reactive or polar hydrogen bonding groups available at the surface.
Kordsa Global, has improved the adhesion performance of polyester cord fabrics at longer curing times which is called overcure, by generating new HarTech dipping formula and proved the performance of new dipping solution with approval of big tire manufacturer companies.
Adhesion of Polyester
Polyester has been started to use as carcass ply and belt in heavy load tires (OTR) to increase the endurance of tires. Furthermore, in light trucks, drivers may overload the truck and the temperature of the tire would increase too much during the driving. Thus, adhesion is important to accelerate and stimulate degradation of polyester fabric during tire service at harsh conditions.