| 摘要 |
<p>The disclosure relates to an ultrasound unit with an annular tool (4) or sonotrode intended for welding packaging containers of irregular or hexagonal cross section. The tool has a flange-shaped projection (8) with a polygonal working surface (5) extending around the tool. The mass of the projection (8) is less than 20 per cent of the total mass of the tool (4) and, as a result, in practice does not affect the dissipation of the ultrasonic waves in the tool in any negative manner.</p> |
