METHOD OF ULTRASONIC SPLICING TIRE TREAD STRIP EDGES

摘要

A method for splicing beveled edges of a relatively thick tire tread strip free of internal reinforcing cords by ultrasonic energy. A contact face of a sonic welding tool or horn is pressed against the mating overlapping edges of the strip at a cylinder pressure within a range of 20 psi to 80 psi. Ultrasonic energy is applied to the strip while the pressure is applied thereto for a period of between 2 seconds and 12 seconds to heat and soften the rubber compound of the strip. Pressure is maintained by the tool against the strip after application of the ultrasonic energy for a period of generally 2 seconds to permit the softened compound to cool, set and bond together to form a strong bond between the overlapped edges. The contact face of the horn generally matches the contour of the contacted surface of the strip.