PROCÉDÉ ET APPAREIL D'APPLICATION D'UNE BANDE D'ÉTANCHÉITÉ SUR UNE TOILE DE MATÉRIAU D'EMBALLAGE

摘要

There is described a method of applying a sealing strip (11) onto a web (4) of packaging material within a strip application apparatus (10) comprising a conveying phase during which the web (4) is advanced along a web advancement path (P); an application phase during which a first longitudinal portion (27) of the sealing strip (11) is applied onto a longitudinal edge (19) of the web (4), a sealing phase during which the first longitudinal portion (27) of the sealing strip (11) is sealed onto the longitudinal edge (19), a control phase during which a correct alignment or a misalignment of the sealing strip (11) with respect to the web (4) is detected and/or determined. The control phase comprises at least an imaging sub-phase during which an image of at least a second longitudinal portion (31) of the sealing strip (11) and at least one reference marker (29) of the strip application apparatus (10) is acquired, a determination sub-phase during which the acquired image is analyzed to determine at least a first transversal distance (d1) between the reference marker (29) and a longitudinal border (57) of the second longitudinal portion (31); and an analysis sub-phase during which the correct alignment or the misalignment is evaluated as a function of at least the first transversal distance (d1).