| 摘要 |
An ultrasonic welding apparatus performs ultrasonic welding to a sheet-like member associated with an absorbent article, the sheet-like member being transported while being wound onto an outer circumferential face of a rotating member, the rotating member rotating about its central axis. The apparatus includes: the rotating member; an ultrasonic processing unit that rotates about the central axis together with the rotating member, and that includes, as ultrasonic processing members, a horn that vibrates ultrasonically and an anvil that sandwiches the sheet-like member with the horn; and an ultrasonic-energy regulating unit. At least either one ultrasonic processing member of the horn and the anvil is guided so as to be able to reciprocate in a CD direction, the CD direction intersecting a transport direction of the sheet-like member, and the at least either one ultrasonic processing member of the horn and the anvil reciprocates in the CD direction with respect to a part of the sheet-like member, the part being wound around the rotating member. In the reciprocation, the at least either one ultrasonic processing member of the horn and the anvil moving to a crossed-over position that is located beyond an end part of the sheet-like member in the CD direction, and the horn and the anvil face each other at the crossed-over position. The outer circumferential face of the rotating member includes sections in which each end part of the sheet-like member is to be positioned. In the case where, of the sections, a section that the at least either one ultrasonic processing member of the horn and the anvil passes when starting to cross the sheet-like member in the CD direction being a first section, a section that the at least either one ultrasonic processing member of the horn and the anvil passes when finishing the crossing being a second section, the ultrasonic-energy regulating unit causes an amount (J/m) of ultrasonic energy to be applied per unit length in the CD direction to start decreasing, when the ultrasonic processing member is passing the second section. |
