Method for making a radial ply tire in a single building stage

摘要

A method of making a belted, radial ply tire in a single stage is disclosed wherein a body layer is formed from one or more body plies of cord fabric which are wound around a tire building drum in such a manner that the cords extend parallel to the axis of the building drum. At least a pair of breaker plies of cord fabric are wrapped around the body plies to create a breaker layer with the cords in each breaker ply being oppositely disposed in adjacent plies, extending parallel to one another within each breaker ply and forming a bias angle of from about 50 DEG to about 70 DEG with a circumferential line corresponding to the crown centerline of the completed tire. A strip of high soft stretch reinforcing tape is wrapped helically over the breaker layer at an angle of substantially 90 DEG to a plane including the axis of the body layer to form a 0 DEG cap band preparatory to securing a tread slab over the breaker layer, completing the raw carcass. The carcass is then expanded into a toroidal form in which the reinforcing tape expands tightly about the breaker layer and the cords in the breaker layer pantograph from their initial larger bias angle to a bias angle of at least about 35 DEG and no more than about 60 DEG . The expanded carcass is then vulcanized. The intermediate article of manufacture formed pursuant to the method is also disclosed.