SYSTEM AND METHOD FOR IN-LINE CONTROLLING THE ULTRASONIC WELDING OF PLASTIC COMPONENTS OF AN ELECTRONIC CIGARETTE

The invention relates to a system (1) for in-line controlling of the ultrasonic welding of plastic components (F, S, B) of an electronic cigarette, the plastic components (F, S, B) being welded to one another at a welding zone (Z) so as to define a welded group (G); the plastic components (F, S, B) are such that the welded group (G) comprises an air passage duct (P) having a first open end (El) and a second open end (E2) . The system (1) comprises: a chamber (2) for receiving the welded group (G); closure means (3), for closing the first open end (El); air supplying means (6), for supplying air into the chamber (2). The system (1) further comprises: air exiting means (4, 40), connecting the welding zone (Z) with the outside of the chamber (2); continuous pressure control and adjustment means (5) for continuously controlling and regulating the air pressure that enters in the air passage duct (P), in order to keep a fixed air pressure; an air passage nozzle (7), having a predetermined cross section, interposed between the continuous pressure control and adjustment means (5) and the second open end (E2); a pressure sensor (8) for detecting the air back pressure generated in the chamber (2) after the introduction of air into the air passage duct (P).