Cutting and ejection method for a cardboard blank and ejection strip for such a method

A method of cutting out an opening in a flat cardboard blank (10, 12) for manufacturing a package, the blank having a first face (11) and an opposite second face (13), the method comprising:

• forming a closed-loop cutout line (16) in the cardboard blank (10, 12), the cutout line (16) defining a first portion (18) of the blank (10, 12) and a second portion (20) of the blank (10, 12) outside the cutout line (16);
• bringing the first face (11) of the blank (10, 12) to face an ejector tape (34) including an adhesive layer (38), the ejector tape (34) being arranged with its adhesive layer (38) on a side towards the first face (11) of the blank (10, 12) and facing the first portion (18) of the blank (10, 12);
• bringing the blank (10, 12), with its cutout line (16), and the ejector tape (34) to face each other between a presser tool (24) and an activation tool (26) that face each other;
• the activation tool (26) presenting a protruding active face (40) facing towards the ejector tape (34) and the blank (10, 12), with its protruding portion being defined by a peripheral edge (44);
• a projection of the peripheral edge (44) perpendicularly onto a plane in which the blank (10, 12) extends being inscribed inside the cutout line (16) with an activation radial margin (dr1) towards the inside away from the cutout line (16);
• inside the peripheral edge (44), the active face (40) presenting a recess (46);
• the presser tool (24) presenting a boss (48) projecting towards the blank (10, 12) from a peripheral surface (50) facing towards the blank (10, 12), the boss (48) presenting an outline (52) relative to the peripheral surface (50);
• a projection of the outline (52) of the boss (48) perpendicularly onto the plane in which the blank (10, 12) extends being inscribed inside the projection of the peripheral edge (44) of the activation tool (26) perpendicularly onto said plane with a pressing radial margin (dr2) towards the inside;
• and
• pressing together the first portion (18) of the blank (10, 12) and the facing ejector tape (34) between the presser tool (24) and the facing activation tool (26) in such a manner as to cause the ejector tape (34) to stick exclusively to the first portion (18) of the blank (10, 12).