Patent ID: 7669629

Claim:
A system for correcting warp of a corrugated board sheet fabricated by a corrugated-board fabrication machine ( 1 ), comprising: imaging means ( 7 ) for imaging the four corner of the corrugated board sheet fabricated by the corrugated-board fabrication machine ( 1 ); detection means ( 8 B) for detecting twist warp of the corrugated board sheet on the basis of image data obtained by the imaging means; 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 twist warp of the corrugated board sheet; 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 ( 1 ); control variable calculating means ( 4 , 4 A- 4 H) for calculating a control variable of a particular control factor that affects the twist warp of the corrugated board sheet and that is one among control factors used to control the corrugated-board fabrication machine ( 1 ) 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 particular control factor using the control variable calculated by said control variable calculating means ( 4 , 4 A- 4 H), wherein the particular control factor is a control factor that affects a distribution of tension acts upon a bottom liner ( 20 ) or a top liner ( 23 ) in the direction of travel of the corrugated board sheet, which distribution concerns a direction across the width of the corrugated board sheet.