<p>The roller (1) has operating rings (4) with a supporting structure that is made of steel and coated with plastic and/or rubber materials. Smooth rings (3) are formed by bulges (5) on a surface of support tubes (2). The operating rings have lateral projections (9) that include a T-shaped cross web (12) on a radial outer side of the projections, where the web protrudes over a radial outer area (11) of the bulges and extends over a contour of valley-shaped parts (7). An extended area of the web is provided above and cooperates with the radial outer area of the bulges in a cleaning manner.</p>
