A system and method for the overprint on flexible supports are described. In particular, the overprint system 1 comprises a printing unit 2 comprising a rotatable printing cylinder 3, having printing zones at the surface thereof, and first actuating means 14, configured to drive in a controllable manner the printing cylinder 3 rotation. The system further comprises a first reel 5 for unwinding a flexible support 4 to be printed, which has preset zones to be overprinted, and a second reel 8 for rewinding the flexible support 4, once it has been printed. A plurality of winding rolls 7 arranges an unwinding path, for the flexible support 4, comprised between the first 5 and the second 8 reels, and passing through the printing unit 2. The system then comprises second actuation means 20, configured to drive in a controllable manner the flexible support 4 advancement along the unwinding path (upstream of the printing unit 2 in the unwinding direction), and control means 10, configured to control in a coordinated manner both the first actuating means 14 and the second actuation means 20, so as to determine at every moment a correspondence of the preset zones to be overprinted of the flexible support 4 with respective printing zones of the printing cylinder 3.

A printing machine for printing on a web includes a first roller and a second roller between which the web forms a loop. A trough for pneumatically guiding the loop equidistantly to the major part of the length of curvature of the trough is provided between the first roller and the second roller.

A printing machine for printing on a web includes a first roller and a second roller between which the web forms a loop. A trough for pneumatically guiding the loop equidistantly to the major part of the length of curvature of the trough is provided between the first roller and the second roller.

A web processing system which includes two rollers configured to rotate at the same phase while being in contact with a web which continuously exists along a movement passage and a suppressing mechanism for suppressing a tension variation of the web between the two rollers.

Systems for applying low viscosity print coating to a web product using a coating roller and an off-press system are provided herein. An example system includes an unwinding station and a winding station. A motor causes the web product to travel along a web path. A coating roller applies a low viscosity print coating to a first side of the web product at a first position along the web path. The low viscosity print coating comprises a salt solution with a centipoise that is less than or equal to 100 centipoise that is configured to enhance printability. A backing roller applies a backing coating to a second, opposite side of the web product at a second, different position along the web path. The backing coating enhances sheet stability of the web product. A drying station dries the low viscosity print coating and the backing coating to remove moisture.

Systems for applying low viscosity print coating to a web product using a coating roller and an off-press system are provided herein. An example system includes an unwinding station and a winding station. A motor causes the web product to travel along a web path. A coating roller applies a low viscosity print coating to a first side of the web product at a first position along the web path. The low viscosity print coating comprises a salt solution with a centipoise that is less than or equal to 100 centipoise that is configured to enhance printability. A backing roller applies a backing coating to a second, opposite side of the web product at a second, different position along the web path. The backing coating enhances sheet stability of the web product. A drying station dries the low viscosity print coating and the backing coating to remove moisture.

Example implementations relate to determining a correction factor that converts a measured sensor distance to a calibrated sensor distance. The measured sensor distance may be based on an amount of substrate advancement through a web printing press between detecting a mark on the substrate at a first sensor and detecting the mark at a second sensor. The calibrated sensor distance may be the separation between the first sensor and the second sensor.

Example implementations relate to determining a correction factor that converts a measured sensor distance to a calibrated sensor distance. The measured sensor distance may be based on an amount of substrate advancement through a web printing press between detecting a mark on the substrate at a first sensor and detecting the mark at a second sensor. The calibrated sensor distance may be the separation between the first sensor and the second sensor.

A coated grooved roll is adapted for use on a web feed press of a converting processing line. The outer diameter surface has a coating adapted to repel adhesive and ink. In one aspect the roll is an idler roll. The outer diameter surface has a region with a plurality of circumferential grooves and adjacent lands each with an arcuate shape with a radius of between about 0.003 inches and about 0.007 inches after coating. In another aspect, the roll is a stripping roll with at least one flute adapted and configured to receive a contact assistance ring. On the outer diameter surface, the flat adjacent the flute has a plurality of circumferential grooves and adjacent lands each with an arcuate shape with a radius of between about 0.003 inches and about 0.007 inches after coating.

The invention relates to an apparatus and method for cutting, printing or embossing a continuous sheet of material. The apparatus comprises a tool element, at least two anvils, which are co-operable with the tool element, and a phase adjustment device. The tool element is configured to have a constant surface speed during operation of the apparatus. The apparatus is adapted to receive the continuous sheet at a constant speed into the apparatus, and being adapted to output the continuous sheet at a constant speed from the apparatus. The phase adjustment device is operable to adjust a speed of the continuous sheet within the apparatus in order to adjust a phase of alternate parts of the continuous sheet to be cut, printed or embossed by each anvil as it co-operates with the tool element.