Unit for spreading an adhesive onto a moving film

Unit for spreading an adhesive onto a moving film, comprising at least one pair of abutments (11) upon which is mounted:

• a first pick-up roller (12) arranged for collecting a quantity of adhesive from a collection zone (13);
• a second roller (14) that rotates in contact with said first roller (12), arranged to receive said quantity of adhesive;
• a third roller (15) that rotates in contact with said second roller (14);
• wherein said abutments (11) comprise one fixed portion (19) and at least a moving portion (20, 21) that is firmly connectable to the fixed portion, wherein on said moving portion (20, 21) there is a part (26b) of a seat (26) for housing a support shaft of the first pick-up roller (12), and wherein on said fixed portion (19) there is a remaining part (26a) of said seat (26) arranged for housing said support shaft of said first pick-up roller (12),
• wherein said moving portion (20, 21) houses:
• in a first configuration, a tank (17) including said adhesive collection zone (13), so that at least one part of the surface of the first roller (12) can come into contact with said adhesive collection zone (13), and
• in a second configuration, an additional fourth roller (18) which is maintained at a given distance from said first roller (12), said collection zone (13) being located in the upper space between said first and said fourth roller (12, 18).