Method and apparatus for controlling cross-machine direction...

Details Method and apparatus for controlling cross-machine direction... Method and apparatus for controlling cross-machine direction...

2007-11-27

2007-11-27

Halpern, Mark (Department: 1731)

Paper making and fiber liberation

Processes and products

With measuring, inspecting and/or testing

C162S263000, C700S129000, C700S127000, C700S128000

Reexamination Certificate

active

10434869

ABSTRACT:
A web making machine is monitored to identify at least one cross-machine direction (CD) actuator that is developing local mapping problems. The identified CD actuator and a segment of surrounding actuators are probed to determine a performance curve for the actuator. The center of an insensitivity region of the performance curve is selected as an optimal mapping alignment setting for the identified actuator with the setting for the actuator being updated. Global smoothing may also be accomplished by probing a global smoothness factor to generate a corresponding performance curve that is then similarly used to select an optimal value for the smoothness factor.

REFERENCES:
patent: 5400258 (1995-03-01), He
patent: 5898589 (1999-04-01), Shakespeare et al.
patent: 6564117 (2003-05-01), Chen et al.
patent: WO 01/49931 (2001-07-01), None
Tim Mast et al., New Optimization of CD Control for Global and Localized Profile Performance; Presented at 2003 Spring Technical Conference Proceedings of the Technical Association of the Pulp and Paper Industry; week of May 11, 2003; Chicago.

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