Vertical roll stack
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
- intermittent motion
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.