Transverse cutting system suitable for being used in a machine for the production of plastic film

A transverse cutting method suitable for being used in a machine for production of plastic film, a cutting unit (15) being positioned in said machine, said cutting unit comprising a cap (17), a hot wire (16), and an idle roller (18), arranged transversally with respect to a path of the plastic film (11) which is moving forwards, wherein said cutting unit (15) is moved between a rest position disengaged from the plastic film and a positioned engaged with the plastic film to be cut, said method comprising:

• causing said cap (17) and said hot wire (16) of the cutting unit (15) to be in a rest position disengaged from the plastic film;
• activating the cutting unit (15) when a spool of the plastic film on a first reel (12) is being completed;
• causing the plastic film, as soon as said cap (17) comes into contact with the plastic film (11), to entrain said cap due to a friction between said cap (17) and said plastic film (11), thereby causing said cap (17) to rotate at a velocity equal to a linear velocity of the plastic film (11);
• and
• causing said hot wire (16) of the cutting unit (15) to enter into contact with said plastic film and to cut said plastic film.