Sonotrode for the ultrasonic welding of plastic components of an electronic cigarette

A sonotrode (1) for the ultrasonic welding of plastic components (G, B) of an electronic cigarette, comprising:

• a body (10) having a longitudinal development along an axis (H);
• the body (10) comprising a first end (2) connectable to an ultrasound generator, and a second end (3) opposite to the first end;
• a cavity (4) for at least partially receiving a plastic component (G) of an electronic cigarette to be welded, developing from the second end (3) of the body (10) towards the first end (2) of the body (10) along an axis parallel to said longitudinal development axis (H);
• the cavity (4) defining an opening (5) at the second end (3) of the body (10), communicating with the outside of the sonotrode (1);
• characterised in that:
• the cross section of the cavity (4) at the opening (5) has an outline comprising:
• a first portion (6) that has the shape of a first arc of a reference circumference (C1) and that comprises a first end (61) and a second end (62), opposite each other;
• and a second portion (7), that has the shape of a second arc of said reference circumference (C1) and that comprises a first end (71) and a second end (72), opposite each other;
• the first end (71) of the second portion (7) being proximal to the first end (61) of the first portion (6), and the second end (72) of the second portion (7) being proximal to the second end (71) of the first portion (6);
• a third portion (8), connected to the first end (61) of the first portion (6) and to the first end (71) of the second portion (7), that develops externally to said reference circumference (C1);
• a fourth portion (9), connected to the second end (62) of the first portion (6) and to the second end (72) of the second portion (7), that develops externally to said reference circumference (C1).