A method and a machine for producing a cardboard strip for packaging from a first plurality of cardboard sheets for packaging which are cyclically united to one another

A method for producing a cardboard strip for packaging from a first plurality of cardboard sheets for packaging which are cyclically united to one another, which method:

• comprises a step of providing a first plurality of cardboard sheets for packaging, wherein each cardboard sheet of the first plurality of cardboard sheets comprises:
• a first main surface and a second main surface which are opposite one another, a reciprocal distance thereof defines a first thickness of the cardboard sheet;
• a first flank;
• a second flank opposite the first flank;
• a first perimeter portion which extends along the first flank of the cardboard sheet;
• and a second perimeter portion which develops along the second flank of the cardboard sheet;
• wherein the first main surface comprises in turn a first central surface, a first perimeter surface which is a part of the first perimeter portion, and a second perimeter surface which is a part of the second perimeter portion;
• and wherein the second main surface comprises in turn a second central surface, a third perimeter surface which is a part of the first perimeter portion, and a fourth perimeter surface which is a part of the second perimeter portion;
• and cyclically carries out following steps:
• reducing the thickness of the first perimeter portion of a cardboard sheet of the first plurality of cardboard sheets, so that the third perimeter surface of the cardboard sheet and the first perimeter surface of the cardboard sheet near one another;
• reducing the thickness of the second perimeter portion of the cardboard sheet, so that the second perimeter surface of the cardboard sheet and the fourth perimeter surface of the cardboard sheet near one another;
• nearing the cardboard sheet and another cardboard sheet of the first plurality of cardboard sheets to one another, so that the second perimeter portion of the cardboard sheet and the first perimeter portion of the other cardboard sheet, the thickness of which first perimeter portion of the other cardboard sheet has been reduced in a preceding cycle, are mutually superposed, and then fixing the second perimeter portion of the cardboard sheet and the first perimeter portion of the other cardboard sheet to one another so that the cardboard sheet and the other cardboard sheet are united to one another.