WM has designed a 3-rolls vertical stack calender to ensure:
Low bending of the rollers
Low thickness tolerance
Rigid frame and roll constructions
Individually designed temperature control systems
Highly accurate single drivers for each roll
The WM thermo calender unit stabilizes and optimizes the PS sheet temperature before entering the forming area. The calender is built on a strong steely carrying structure.
There are two kinds of movements:
Continuous motion is used at the production start-up for sheet lead-in. Intermittent motion is used within the normal sequence of production run.
High energy efficiency as heating ovens are not necessary.