Disclosed is a gluing device including a reservoir tank of liquid glue; an applicator roll partially immersed in the liquid glue; a doctor roll for adjusting a thickness of the liquid glue adhered to the applicator roll to become uniform; and a pair of glue dams for regulating a width of the liquid glue adherable to the applicator roll. The gluing device is configured to apply the adhered liquid glue on the applicator roll to a corrugated medium of a corrugated paperboard sheet. Each of the glue dams includes a pair of dam units located in spaced-apart relation to each other in a width direction of the applicator roll. The pair of dam units are configured to form a glue-uncoated region interposed between the pair of dam units on an outer peripheral surface of the applicator roll so as to correspond to a trimming region of the corrugated paperboard sheet.

The plant comprises includes a visual inspection system provided with one or more vision units. The vision units detect and recognize, through adequate electronic processing, the images printed on at least one face of the corrugated board web. Based on the image recognition, the control system recovers, from a lookup table, information for setting the converting line to produce the subsequent order of sheets.

The invention relates to a device for producing a web of corrugated cardboard comprising a first corrugating roller for producing a corrugated web. The device further has a glue application roller for applying glue to the corrugated web. The glue application roller is associated to the first corrugating roller so as to form a gap and is displaceable relative to the first corrugating roller in order to influence the glue application quantity. The device further comprises a displacement device for displacing the glue application roller relative to the first corrugating roller and a pressing device for pressing a laminating web against the corrugated web. It is further provided with a regulating device which is in signal connection with the displacement device, a gap regulating unit in order to adjust a gap width of the gap between the first corrugating roller and the glue application roller, and a contact force regulating unit in order to adjust a contact force applied to the first corrugating roller by the glue application roller.

The invention relates to an assembly for producing a web of corrugated cardboard. The assembly has a corrugating device for producing a corrugated web, a glue application device for applying glue to the corrugated web and a pressure belt device which has an endless pressure belt guided around a deflection roller and a belt course regulating roller for pressing a cover layer against the corrugated web provided with glue. The pressure belt device has at least one pressure belt detection device associated to the pressure belt, the pressure belt detection device comprising a first pressure belt detection means for detecting the position of a first outer endless side edge of the pressure belt in the transverse direction thereof, a pressure belt regulating device in signal communication with the pressure belt detection device and an actuating device connected to the belt course regulating roller displacement device for displacing the belt course regulating roller depending on the regulating signals received from the pressure belt regulating device.

Equipment for controlling manufacture of corrugated cardboard, including: a sensor arrangement arranged to measure moisture of a liner in connection with unwinding of the liner in an unwinding part in order to control the moisture of the liner prior to gluing to a fluting on the basis of the measured moisture.

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.

An arrangement for a corrugator for producing corrugated cardboard comprises a material web delivery device for delivering a material web and an edge cutting device, which is arranged downstream of the material web delivery device in a transport direction of the material web and has at least one edge cutting apparatus for edge-cutting the material web, and a digital printing device, which is arranged downstream of the edge cutting device in the transport direction of the material web for printing on the material web.

In a device for detecting a paper splice part of a cardboard sheet and a device for producing a cardboard sheet, the device for detecting a paper splice part of a cardboard sheet, which detects a sheet paper splice part of a cardboard sheet that has a first sheet, a corrugated second sheet, and a third sheet bonded together, comprises: a sheet paper splice detection unit that detects the sheet paper splice part on the basis of the shape of the sheet and that is placed between a position at which sheets are spliced and a position at which the sheets are bonded in a sheet carrying direction; a marking device that marks the sheet paper splice part on the downstream side of the sheet paper splice detection unit in the sheet carrying direction; and a mark detection device that detects the mark on the downstream side of the marking device in the sheet carrying direction.