Fuente: WIPO "tomato" System (100) for heating a longitudinal edge of a packaging web (101) advancing along an advancement path (FD) and comprising: a heating element (103) configured to heat the packaging web (101); and an actuating apparatus (104) coupled to the heating element (103) and comprising an actuator (105) configured to synchronize a movement of the heating element (103) with the movement of the packaging web (101).