STRUCTURE OF TIRE TREAD FOR EASY DISCHARGE OF STATIC ELECTRICITY

摘要

PURPOSE: Structure of a tire tread is provided to discharge frictional static electricity from a tire without degradation of wear resistance and performance at a low fuel ratio. CONSTITUTION: A tire tread consists of a cap tread(10) and an under tread(20). A band-shaped discharge path(30) exposed to the outer surface of the cap tread is formed through the under tread and the cap tread. The cap tread is formed of a tread rubber composition containing more than 70% of silica. The rubber composition of the under tread and the discharge path is applied with 100% of carbon black. The discharge path forms 90-180 angular degrees from the under tread to the outer surface of the tread.