A network-based system and method for providing desired moisture set point values for individual papers lines based on the physical properties of each liner and the atmospheric conditions associated with a corrugator is disclosed. The desired moisture set point values are based on the hygroexpansivity of each individual paper liner. Once the moisture set point value has been determined, a conditioning apparatus adjusts a moisture value for each liner in order to tune the post-warp characteristics of the final corrugated product.

The corrugated cardboard sheet manufacturing system including a production state information acquisition device; a control value information acquisition device for acquiring control value information of a control element of a corrugated cardboard sheet manufacturing apparatus exerting an influence on the warp of a corrugated cardboard sheet; a warp information acquisition device for acquiring information of a warp amount of the corrugated cardboard sheet; a storage device for storing a performance data set including at least production state information, the control value information, and the warp information; a pre-control table storing a standard control value of the control element set in accordance with a production state; a correction table for correcting the standard control value to set an initial control value; an update device for updating the correction table by reflecting the performance data set; and control device for performing feedforward control of the control element using the initial control value.

A device for determining the quality of a moving corrugated board web with at least one cover web and at least one corrugated web. A quality determination sensor arrangement, which includes a first quality determination sensor unit facing the corrugated board web, is provided for determining the quality of the corrugated board web on its first side, and a second quality determination sensor unit, facing a second side of the corrugated board web opposite the first side, for determining the quality of the corrugated board web on its second side. The device includes an evaluation unit that is in signal contact with the quality determination sensor arrangement and evaluates signals from the quality determination sensor arrangement related to the quality of the corrugated board web.

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 apparatus for use in producing a corrugated board product includes a flotation column for emitting pressurized air to support a traveling corrugated board product on a cushion of air void of contact with other surfaces at a point of warp detection. A warp detection apparatus is used in combination with the flotation column to analyze the supported traveling corrugated board product to permit adjustment of variables in a corrugated manufacturing system for corrected detected warp in the product.

A warp determination device for a corrugated cardboard sheet manufacturing device is provided with: displacement value measurement method for measuring displacement values of a plurality of corrugated cardboard sheet pieces on the downstream side of a slitter scorer and on the upstream side of a sheet stacking unit; and warp status determination means for dividing a measurement range of the displacement value measurement method according to a width dimension of the plurality of corrugated cardboard sheet pieces, allocating the divided measurement ranges to each of the plurality of corrugated cardboard sheet pieces, and determining a warped status of the corrugated cardboard sheet pieces for each of the plurality of corrugated cardboard sheet pieces on the basis of measurement values from the displacement value measurement method in the allocated measurement ranges.

A device for determining the quality of a moving corrugated board web with at least one cover web and at least one corrugated web. A quality determination sensor arrangement, which includes a first quality determination sensor unit facing the corrugated board web, is provided for determining the quality of the corrugated board web on its first side, and a second quality determination sensor unit, facing a second side of the corrugated board web opposite the first side, for determining the quality of the corrugated board web on its second side. The device includes an evaluation unit that is in signal contact with the quality determination sensor arrangement and evaluates signals from the quality determination sensor arrangement related to the quality of the corrugated board web.

An apparatus for use in producing a corrugated board product includes a flotation column for emitting pressurized air to support a traveling corrugated board product on a cushion of air void of contact with other surfaces at a point of warp detection. A warp detection apparatus is used in combination with the flotation column to analyze the supported traveling corrugated board product to permit adjustment of variables in a corrugated manufacturing system for corrected detected warp in the product.

An apparatus for use in producing a multi-layer product includes a flotation column for supporting the multi-layer product at a variable height above the flotation column on a cushion of air. The apparatus further includes a warp detection apparatus for detecting an amount of warp in the multi-layer product supported by the flotation column.

A network-based system and method for providing desired moisture set point values for individual papers lines based on the physical properties of each liner and the atmospheric conditions associated with a corrugator is disclosed. The desired moisture set point values are based on the hygroexpansivity of each individual paper liner. Once the moisture set point value has been determined, a conditioning apparatus adjusts a moisture value for each liner in order to tune the post-warp characteristics of the final corrugated product.