In this machine sketch are 10 driven rolls; all controlled by a Drive Control System (DCS). If just one of those 10 rolls is not correctly entered into the DCS, many problems are likely to appear:
- damaged sheet surface, resulting in poor printability
- felt hairs in the sheet, which is bad news for coaters and printers
- many wet-end breaks, from a few per day up to several per hour
- increased felt wear with all the related costs
- and when using seamed felts: increased flap wear and seam marking
The press section is very sensitive for the correct speed settings. The sheet properties and dimensions change over a very short period of time, but the web is still weak. Just a little too much draw somewhere can lead to numerous breaks.