Patent ID: 6233495
Filing Date: 2001-05-15
Classification: D21G,G01N

Abstract:
A method for modeling two-dimensional (2D) responses, machine direction (MD) and cross-machine direction (CD), of a plurality of CD actuators extending across the width of a machine used for manufacturing a web of sheet material, said method comprising the steps of:selecting a plurality of random probing sequences corresponding to said plurality of CD actuators;perturbing said plurality of CD actuators with said plurality of random probing sequences;measuring said web of sheet material being formed while perturbing said plurality of CD actuators with said plurality of random probing sequences;estimating global process MD dynamics of said plurality of CD actuators; andestimating a CD response for each of said plurality of CD actuators by using said plurality of random probing sequences, measurements of said web of sheet material and estimated global process MD dynamics, said global process MD dynamics and said CD responses forming 2D responses for said plurality of CD actuators.