Patent ID: 7424901

Claim:
A system for correcting warp of a corrugated board sheet fabricated by a corrugated-board fabrication machine ( 1 ), which corrugate board sheet includes a top liner, a medium web and bottom liner, comprising: warp status information obtaining means ( 6 , 6 A- 6 H, 7 , 7 A, 7 B, 8 , 8 A- 8 H, 240 a , 240 b , 241 a , 241 b ) for obtaining warp status information concerning status of the warp of the corrugated board sheet fabricated by the corrugated-board fabrication machine ( 1 ); running-state information obtaining means ( 5 , 5 A- 5 H) for obtaining running state information concerning a running state of the corrugated-board fabrication machine (I); single facer ( 11 ) for fabricating a single-face web by gluing the medium web and the bottom liner together; double facer ( 16 ) for fabricating the corrugated board sheet by gluing the top liner and the single-face web together, comprising hotplates ( 162 ) for heating and press rolls ( 264 A) for pressing; rotation mechanisms to rotate the press rolls while keeping parallel relationship with the hotplates ( 162 ) and change tilt angles of the press rolls ( 264 A) with respect to the width direction of a web; control variable calculating means ( 4 , 4 A- 4 H) for calculating the tilt angles of the press rolls based on the warp status information of the corrugated board sheet and the running state information of the corrugated-board fabrication machine ( 1 ); and control means ( 5 , 5 A- 5 H) for controlling the rotation mechanisms using the tilt angles calculated by said control variable calculating means ( 4 , 4 A- 4 H).