Patent ID: 8776856

Claim:
An ultrasonic joining apparatus comprising: a rotating drum having an anvil formed on an outer peripheral surface of the rotating drum; and an ultrasonic horn configured to output ultrasonic vibrations, wherein the rotating drum has a rotational shaft extending in parallel with a cross direction orthogonal to a machine direction in which manufacturing processes flow, the rotating drum and the ultrasonic horn are arranged to face each other with an intermediate web interposed therebetween, the intermediate web including a first web and a second web overlapping with each other, the anvil and the ultrasonic horn pinch a certain region of the intermediate web, which is conveyed in the machine direction, to perform ultrasonic joining on the certain region, the anvil includes: a projection protruding in a normal direction of the rotating drum and being formed in a line shape extending in the cross direction; and a plurality of protrusions protruding from the projection in the normal direction, and the projection has a cut formed therein, the cut extending in a direction opposite to a protrusion direction of the protrusions.