595083 A joining apparatus and method for joining two or more layers of an absorbent article is disclosed. The apparatus comprises an ultrasonic vibrating device (110) configured to apply ultrasonic vibration to a joining region and an anvil roller (120), facing the ultrasonic vibrating device. The anvil roller also comprises a protrusion (122) for pressing the joining region of the layers against the ultrasonic vibrating device. A motor (130) is configured to rotate the anvil roller, and a pressing mechanism (150) is configured to maintain tension in the belt in a direction transverse to a driving direction of the belt.
