Uncured tyre tread strip - has tread layer with grooves along edges with specific relationship to difference in vol. of grooved and raised areas in final cured tread

摘要

In a process for producing radial tyres with grooves in the shoulder areas the uncured tread layer has a series of depressions at an equal distance from each other formed along the edges. The depressions are created in the tread layer before final vulcanization of the tyre and correspond with the tread grooves in the final product. The volume of each depression has a certain relationship to volume difference between the area below the groove and the adjacent raised area in the final cured tread. USE/ADVANTAGE - The tyres are used in arduous applications such as heavy goods vehicles and buses. (P) produces a tyre in which the waviness of the outer surface in the shoulder area is reduced. This in turn reduces the chances of separation of the reinforcing layer. Tyre appearance is improved.