A cylinder of a rotary printing machine has a peripheral surface which is divided into at least two segments that are situated adjacent to each other, in an axial direction of the cylinder, by a circumferential groove. The intermediate layer is produced solely from binding monofilaments. The sensors generate multiple measurement signals for obtaining at least two measured values of the real time solid flow rate. The messaging center has a storage device and a central processing unit. The conductive contact is fabricated by applying a metal layer onto a backside of a substrate, forming a through-hole through the substrate and the metal layer, sealing the hole in the metal layer by an electroless plating process, and filling the hole by an electroplating or an electroless plating process. 45 \u03bcm-wide L & S was formed at 130 mJcm2.