VERFAHREN UND VORRICHTUNG ZUM ULTRASCHALLQUERVERSIEGELN DER WÄNDE EINES MIT EINEM FLIESSFÄHIGEN NAHRUNGSMITTEL GEFÜLLTEN VERPACKUNGSMATERIALS

摘要

An ultrasonic sealing device for sealing the walls (9) of a tube (2) of heat-seal packaging material filled with a pourable food product and fed along a path (P), and wherein the tube (2) has a longitudinal seal (LS) parallel to the path (P); the device having two jaws (3, 4) for gripping two walls (9) of the tube (2) locally and compressing a seal portion (15) having a portion of the longitudinal seal (LS), and an ultrasonic generator (6) for subjecting the seal portion (15) to ultrasonic vibrations to melt the heat-seal packaging material and seal the walls (9) along the seal portion (15); one of the jaws (3, 4) having a portion (18) having a succession of grooves (19) parallel to the path (P) and for compressing the portion of the longitudinal seal (LS).