In the Hot-Rolling process, when a thin strip runs on the Run-Out-Table (ROT) at high speed in the state of non-tension (a head or a tail of a strip), the defects resulting from the running instability pose a chronic problem. Moreover, for the running unstable phenomenon, the maximum line speed has been restrained, and has also become a prevention factor of productivity. In order to solve and improve this problem, various methods have been proposed from the former, but it has not eradicated completely. In this paper, we propose two types of the experimental method to simulate the ROT running phenomenon in a laboratory. The ROT strip running unstability theorem was proven by using them experimentally. By utilizing them, the improvement cost and term become cheaper and shorter.
