MANUFACTURE METHOD OF FOOT BALL

摘要

attaching four sheets of ball surface pieces of velcro cloth to each of left/right peripheral portions thereof, to form two hemispheric surfaces; closing the surfaces to each inner surface of molding rooms of upper and lower metal molds ; injecting a polyurethane liquid in the surfaces; scattering and hardening the polyurethane at a room temperature for 5 minutes in the sealed molding room; coating the polyurethane sponge into all surfaces of a core of a rugby ball.