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Abstract

An ultrasonic rotary horn for continuously bonding together two or more layers of thermoplastic materials such as woven and nonwoven fabrics and films. The horn is adapted to resonate in a manner such that: 1) the excited end moves substantially in phase with the movement of the source of excitation; 2) the opposing end, whether or not it is actively excited, moves substantially out of phase with the movement of the excited end; 3) the radial work-contacting surface of the horn also moves substantially out of phase with the movement of the excited end; and 4) the horn exhibits a single nodal point at its geometric center. The horn has a concave configuration which comprises a central, circular flat portion which is concentric with the rotational axis and a convex portion between the flat portion and the radial surface. The convex portion is a curved surface having axial symmetry and a curvilinear profile in cross-section through the rotational axis.

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First Claim