A rolled metal strip, in particular steel strip, is deflected by means of a driving roller unit from a first transporting direction into a second transporting direction and is fed to a coiler. In the coiler, the metal strip is coiled into a coil with a coil diameter. A plastic deformation of an end portion of the metal strip is brought about, so that in the unloaded state the end portion is curved with a radius of curvature. The plastic deformation of the end portion (8) is at least partially brought about by an asymmetric application of a cooling medium (21) to the sides of the end portion (8).