Patent ID: 6807510
Filing Date: 2004-10-19
Classification: D21G

Abstract:
A process for coordinated control of machine direction MD and cross direction CD actuators in a sheetmaking machine for manufacturing a sheet of material comprising the steps of:measuring a plurality of sheet properties at regular intervals to collect sheet measurement data; manipulating the sheet measurement data to establish a plurality of sheet property measurement arrays; processing the sheet property measurement arrays to establish a one dimensional common resolution measurement array generating an array of the estimated current internal state of the sheet manufacturing process; establishing a future sheet property target array; generating an array of future predictions of sheet properties using the array of the estimated current internal state of the sheet manufacturing process and a sheet machine process model; and inputting the array of future predictions of sheet properties, the future sheet property target array, and an array of previous actuator set points into an object function solvable to yield an array of optimal changes in the current actuator set points for coordinated MD and CD control of the sheet making process.