Ball for ballgames and manufacturing process thereof

摘要

A plurality of granules of a hard synthetic resin and a soft synthetic resin are heated with a blowing agent to a temperature between the softening temperatures of the hard and soft resins for a predetermined time and are molded to form a ball. The resultant ball has a plurality of bubbles in the soft synthetic resin which surrounds the granules of hard synthetic resin and a suitable cover of leather or rubber is provided for the ball.