Patent ID: 7802604

Claim:
A device having a sonotrode ( 1 ) for ultrasound treatment of workpieces, wherein the input side of the sonotrode ( 1 ) is connected to a drive unit ( 5 ) having at least two ultrasound oscillator units stimulated by an ultrasound generator, provided forwardly at the output side of the sonotrode with a long narrow treatment surface extending in an X-direction ( 12 ) and laterally with at least one slit ( 10 ) located approximately between two ultrasound oscillator units; characterized in that the sonotrode ( 1 ) is unitary, excluding recesses ( 6 ) to accommodate the appropriate drive unit ( 5 ), from its treatment surface ( 12 ) rearwardly in the direction (Y) of its height (H) to its rearward flat surface ( 13 ) which, on the input side of the sonotrode ( 1 ) opposite to the treatment surface ( 12 ) on the output side, is approximately parallel to the treatment surface ( 12 ), has almost the same length thereas, but is wider than the latter, and in that the outer surface of the sonotrode ( 1 ) is closed, apart from said at least one slit ( 10 ) and apart from openings ( 14 ) in the rearward flat surface ( 13 ) providing access to the recesses ( 6 ) for the drive unit ( 5 ), whereby the total height of the sonotrode is ≦λ/2 wherein λ=the wavelength of the wave oscillating in the Y direction.