The focus is on intermittent sealing of top seals, e.g. of stand-up pouches, despite any product residues present. The vibration of the ultrasonic tool allows for obtaining reliable joint quality despite dusty or pasty filling contents. Burns caused to the packaging material during machine downtimes are safely prevented. The Herrmann SUP module is optimally suited for integration in new machinery or as retrofit in existing machine designs. Designing the module as IP67 variant, the top seal module is also suitable for wash down.