Process for presetting a calender and calender for implementing the process

Abstract

A process for presetting a calender for a material web and a calender. The calender includes a roll stack having at least a first nip and a second nip arranged to define a stack plane and comprising a sag compensation lower roll having a rotationally secured carrier which can be moved along the stack plane by external support devices arranged at both ends of the lower roll, the lower roll having a jacket which is supported on the carrier by internal support devices wherein the jacket can be adjusted along its entire length in the direction of the stack, the calender further comprising at least one middle roll which can be adjusted in the stack plane and a sag compensation upper roll having a carrier which is held stationary at its ends and a jacket which supported on the carrier by internal support devices, the jacket being mounted to the carrier at its ends. The process includes applying pressure to the internal support devices of the lower roll such that the jacket of the lower roll approximately forms a cylinder having a horizontal axis, applying pressure to close each of the first and second nips, the pressure being applied to one of the external support devices of the lower roll and the internal support devices of the lower roll, and recording the pressures on at least one of the internal support devices of the upper roll, the internal support devices of the lower roll, and the external support devices of the lower roll at an instant of a complete closing of the first nip.