How Do You Know the CD Control Is Doing Its Best Job?, TAPPICon22

This paper provides guidelines on CD control capability with examples. After reviewing theoretical work on the subject, important practical questions are answered. These include: - What is the impact of wide or narrow CD actuator responses on CD control? - Is a particular wavelength of variation controllable? - When CD actuators have narrow response and big negative tails (for example, from slice actuators), what techniques are used to guarantee the CD control stability? - How to enforce multi-layer headbox actuators to move in the similar shape (to guarantee layer stability) while each individual layer actuator is still controlling? - How can CD mapping and sheet shrinkage information be validated before implementing a new control mapping to improve CD control? (Examples of using CD Mapping Spreadsheet). The paper will use mill examples to illustrate how to know the CD control is doing the best job.

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