CD-Caliper Profile Improvement With A New Powerful Multi - Zone Controlled Calender Roll, 2005 Practical Papermaking Conference

Cross Directional caliper variation, expressed by the 2-σ (2-Sigma) value is among the most critical of quality measurements for paper and board grades. Excessive variation in caliper profile not only results in visual inconsistencies, but more importantly in uneven paper draws throughout the papermaking and converting process. These and other factors can result in poor roll structure which could have an array of negative consequences in subsequent paper processing and cause runnability issues with the paper roll.

Close monitoring and correction of excessive CD-caliper deviations are customarily done in the forming section or during the calendering process.

This paper covers the recent advancement of the most effective CD-profiling method at the calender by means of a multi-zone controlled calender roll. These new calender roll advancements include particular design features which add benefits to the entire papermaking and converting process.