(57) A unit (20) for the incision of a strip (15) made of a plastic material to cut two
distinct incisions (7, 9) into two opposite surfaces (8, 10) of the strip (15); the
incision unit (20) has: a conveying device (21), which feeds the strip (15) along
a conveying direction (C); two support plates (41), which are arranged on opposite
sides of the strip (15), so that each support plate (41) faces a corresponding surface
(8; 10) of the strip (15); and at least two incision devices (42), each of which cuts
an incision (7; 9) into a corresponding surface (8; 10) of the strip (15) and has
a cutting element (43), which is supported by a support plate (41), and a contrast
element (44), which is supported by the other support plate (41).
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