The implementation of additional con- trol loops to compensate backup roll eccentricity and harmonic hardness variation allows a significant improvement in strip thickness performance. These measures were successfully implemented as an extension to an exist ing two-stand alumin ium cold rolling mill. An essential quality characteristic in the cold rolling sector is the minimum thickness deviation that can be achieved at final gauge, i.e. from the finishing pass. However, the need to maximize productivity requires that tight thickness tolerances have to be achieved even under sub-optimal mill and entry strip conditions. To meet this requirement there is a need for improved and advanced control concepts. Process-related disturbances during rolling The analysis of a two-stand

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