Patent ID: 8224476
Filing Date: 2012-07-17
Classification: D21G

Abstract:
1. A method for detecting misalignment of a sheetmaking system having a plurality of actuators arranged in the cross-direction and having a cross-directional (CD) controller for providing control to a spatially-distributed sheet process which is employed in the sheetmaking system, the method comprising the steps of: (a) operating the system and measuring a profile of the sheet along the cross-direction of the sheet downstream of the plurality of actuators and generating a profile signal that is proportional to a measurement profile; (b) tuning the CD controller with an acceptable CD alignment; (c) initiating artificial misalignment; (d) performing baselining operations to establish baseline threshold detection conditions; (e) monitoring the operating conditions; (f) signaling misalignment when operating conditions exceed the threshold detection conditions.