New materials drive development of thermo rolls for high speed calenders

Paper companies are using more online, multi-nip calenders to produce high-quality paper grades. Paper machines up to 11 meters wide with production speeds up to 2000 m/min are now a reality. These operating conditions demand higher standards for the thermo rolls used in calendering systems. Operating criteria-such as reliability, process conditions, efficiency, and flexibility-are critical. A thermo roll used in a high-speed modern calender, for example, requires the best possible materials and an optimized design for specific operating conditions.