System and method for in-line controlling an ultrasonic welding of electronic cigarette plastic components

A system (1) for in-line controlling the ultrasonic welding of plastic components (F, S, B) of an electronic cigarette, said plastic components (F, S, B) being welded one to the other at a welding zone (Z) so as to define a welded group (G);

• the plastic components (F, S, B) being conformed in such a way that the welded group (G) comprises an air passage duct (P) having a first open end (E1) and a second open end (E2);
• the system (1) being characterized in that it comprises:
• a chamber (2) for receiving the welded group (G);
• closure means (3), for closing the first open end (El) of the air passage duct (P) of the welded group (G);
• air supplying means (6) for supplying air into the chamber (2) determining the introduction of air in the air passage duct (P) through its second open end (E2);
• air exiting means (4, 40), arranged for connecting the welding zone (Z) with the outside of the chamber (2), allowing the possible exit of air outside the chamber (2);
• continuous pressure control and adjustment means (5), arranged between the air supplying means (6) and the second open end (E2) of the air passage duct (P) 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 determined cross section, interposed between the continuous pressure control and adjustment means (5) and the second open end (E2) of the air passage duct (P), through which the air passes;
• and
• a pressure sensor (8), connected to the chamber (2), for detecting an air back pressure generated in the chamber (2) after the introduction of air into the air passage duct (P).