Patent ID: 8616480

Claim:
A shredder for producing particles from a sheet material, wherein the shredder comprises: a transverse cutting device positioned after a longitudinal cutting device, wherein the longitudinal cutting device comprises: a. a first cutting roller comprising: (i) a high-low profile with first longitudinal faces, wherein the first longitudinal faces are inclined to a direction of a longitudinal axis of the first cutting roller; and (ii) first abutting faces extending at least section-wise perpendicularly or being at least section-wise inclined up to four degrees to a perpendicular of the longitudinal axis of the first cutting roller; b. a second cutting roller comprising: (i) a high-low profile with second longitudinal faces, wherein the second longitudinal faces are inclined to a direction of a longitudinal axis of the second cutting roller; and (ii) second abutting faces extending at least section-wise perpendicularly or at least section-wise inclined up to four degrees to the perpendicular of the longitudinal axis of the second cutting roller; and c. wherein the high-low profile of the first cutting roller engages with the high-low profile of the second cutting roller to a penetration depth in the direction of the longitudinal axes of the cutting rollers, wherein at least one of the first longitudinal faces and at least one of the first abutting faces of the high-low profile of the first cutting roller abut section-wise on at least one of the second abutting faces, wherein at least one of the second longitudinal faces and at least one of the second abutting faces of the high-low profile of the second cutting roller abut on at least one of the first abutting faces of the high-low profile of the first cutting roller such that resultant cutting edges of the longitudinal cutting device extend parallel in a longitudinal direction of a sheet material, wherein at least three of four sides of respective cut strips of the sheet material are in contact between respective longitudinal faces of the high-low profiles of the first cutting roller and the second cutting roller and the respective abutting faces of the high-low profiles of the first cutting roller and second cutting roller and are guided at an angle to the respective longitudinal axes of the first cutting roller and the second cutting roller according to inclinations of the respective longitudinal faces and are guided parallel in the longitudinal direction of the sheet material according to the resultant cutting edges such that the respective cut strips are supplied parallel in the longitudinal direction of the sheet material continuously to the transverse cutting device.