Device and method for weakening a sheet of aerosol-generating substrate for an aerosol-generating article component

A device for weakening a sheet of aerosol-generating substrate for an aerosol-generating article component, the device comprising:

• a first roller having a first rotation axis and comprising a plurality of first circumferential ridges provided on a first radial outer face of the first roller, the first circumferential ridges delimiting a respective plurality of first circumferential grooves on the first radial outer face, wherein each first circumferential ridge has at least one circumferential recess and the circumferential recesses of the plurality of first circumferential ridges form at least one first interruption band on the first radial outer face;
• and
• a second roller having a second rotation axis and comprising a plurality of second circumferential ridges provided on a second radial outer face of the second roller, the second circumferential ridges delimiting a respective plurality of second circumferential grooves on the second radial outer face, wherein each second circumferential ridge has at least one circumferential recess and the circumferential recesses of the plurality of second circumferential ridges form at least one second interruption band on the second radial outer face;
• wherein the first roller and the second roller are configured to rotate in opposite directions about the respective first rotation axis and second rotation axis,
• wherein, at a coupling zone of the first roller with the second roller, the first circumferential ridges are partially inserted in the second circumferential grooves and the second circumferential ridges are partially inserted in the first circumferential grooves, and
• wherein the at least one first interruption band and the at least one second interruption band, when facing each other at the coupling zone, are crossed with respect to each other.