Roller line force correction - applies controlled forces to axes of intermediate rollers

摘要

To correct the line forces applied by super calenders and other pressure systems, using more than two rollers (1,4) and at least one non-bending controlled intermediate roller (4), controlled or regulated forces (6,7) are applied to the axes (5) of the non-bending intermediate rollers (4) to support the emerging line force correction profile from the bending compensating rollers (1). Pref. the controlled forces (6,7) are applied to the axes (5) of the intermediate rollers (4) in both directions along their pressure plane, or a force (7) is applied against the overhang weights. With a line correction profile which is assymetrical to the roller centre of the bending roller, forces (6,7) are applied at the axes (5) of the intermediate rollers (4) of the forces (6,7) support the roller (4) axes (5). USE/ADVANTAGE - The method is for use with pressure roller systems for moving webs, such as super calenders, polishing and roller presses. The system gives zonal corrections as required for the directly controlled and non-controlled sections of the roller gaps and counter distortion in the required line force profile.