The plant for producing a corrugated board includes one or more single facers and a double facer, as well as respective unwinders for unwinding reels of paper webs. Arranged along the production line, in suitable positions, are thermographic cameras which acquire images through which it is possible to trace the various characteristics of the cardboard, for example the moisture content thereof, detect manufacturing defects, after which it is possible to intervene on one or more process parameters so as to eliminate the causes of the defects.

The plant for producing a corrugated board includes one or more single facers and a double facer, as well as respective unwinders for unwinding reels of paper webs. Arranged along the production line, in suitable positions, are thermographic cameras which acquire images through which it is possible to trace the various characteristics of the cardboard, for example the moisture content thereof, detect manufacturing defects, after which it is possible to intervene on one or more process parameters so as to eliminate the causes of the defects.

The invention relates to a corrugated cardboard production unit (2) and to a method for monitoring such a corrugated cardboard production unit (2), wherein the sheets (6) are placed so as to lie partially on top of one another on a conveyor belt (10) extending in a longitudinal direction (8), so that an end-face edge (26) of a leading sheet (6) rests on a trailing sheet (6). A defined region of a conveyor device (4) of the corrugated cardboard production unit (2) is specified as a test region (12), and images (I) of the test region (12) are captured by means of a camera (22). When viewed in the longitudinal direction (8), the camera (22) is oriented upstream and obliquely towards the test region (12) and thus towards the end-face edge (26) of a sheet (6) located in the test region (12). On the basis of at least one of the captured images (I), the course of the end-face edge (26) is analyzed with regard to a deviation from the flatness of the sheet (6) by means of an automatic image analysis.