Tension levellin consists of subjecting the strip of sheet metal to a traction force sufficient to exceed the yield stress of the fibres making up the material, combining this lengthening with simultaneous deformation of the strip caused by intermeshing of the levelling rolls. It is this combination that distinguishes tension levelling from traditional levelling in the so-called multi-roll levellers, with improved flatness being achieved. The entry and exit bridles and the intermediate roll leveller are at the core of the installation. The traction bridles are normally equipped with 2, 3 or 4 rolls, depending on the traction required for levelling. The traction bridles allow very high strip traction to be obtained. Within the individual configuration, each bridle is driven by an electric motor, and the leveller is located between the two bridles. For soft or thin materials, one set of levelling rolls is sufficient. However, for materials with a high yield stress and for thick metals, the levelling process is more efficient when two sets of rolls are used. The levelling beams may be of 2 or 3 different heights, depending on the material to be processed. For delicate materials such as galvanised steels, tin steels or aluminum and thin metals, it is preferable to use levelling beams with 3 heights. The process may be either wet or dry.
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