Patent attributes
In the present invention, ultrasonic vibration is outputted to predetermined regions of a first web and a second web from an output surface of an ultrasonic horn so that the predetermined regions may be bonded. The output surface includes a central output portion in a center region of three equal regions into which each predetermined region is divided, and both-ends output portions in both-ends regions at sides of the center region. A central maximum amplitude of the ultrasonic vibration outputted from the central output portion is smaller than an end maximum amplitude of the ultrasonic vibration outputted from each of the both-ends output portions. A central bonding strength of the center region is smaller than an end bonding strength of each of the both-ends regions.
