A steel tube rotates around the fixed axle. The circular gap is separated by two seals in two semi-circular chambers. The chamber facing the nip is hydraulically pressurised by oil. An oil pressure is generated that counters the deflection forces of the cylinders. The S-Roll is able to adapt perfectly against the counter-roll, ensuring an even line force. No friction is created in the nip, as both rolls are completely cylindrical. The line force can be adjusted in various ways to suit