In order to stabilize the rolling operation and to maintain product quality in a hot strip finishing mill, it is necessary to control the tension applied to the strip and the looper angle in interstand within their reference values. In this paper, we develop different laws of interstand control to improve tension strip and looper angle accuracy. The criterion of performance comparison is the rejection of perturbation on these two variables. The advanced interstand controls are : I) the conventional looper control, 2) decoupling control for looper system in frequency domain or state space, 3) interstand multivariable control based on optimal control theory in state space. This study presents a discussion and application of these new looper controls which are compared to the conventional one, orientating the regulation structure choice to be implanted in the future.
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