Abstract: A method for calibrating a rotary printing press, in which a bearing structure for a printing cylinder is adjusted relative to another component of the printing press, and positions of the bearing structure are measured, including the steps of mounting a calibration tool on a mandrel that is supported in the bearing structure, the calibration tool having at least one contact sensitive switch, moving the bearing structure until the at least one switch contacts the other component, and upon detection of a signal from the at least one switch, storing a measured position of the bearing structure as a reference position.

Abstract: A method of colour setting in a rotary printing press, in which a composition of an ink is adjusted until colour specifications of a printed product, that is formed by a substrate with the ink printed thereon, match given target colour specifications, including the steps of measuring (S1) a volume carrying capacity of an inking roller that will be used in the printing press for printing with the ink, measuring (S2) a spectral opacity of the substrate, measuring (S3) a spectral absorptivity of the ink when it is in a liquid state in the printing press; and entering the measured volume carrying capacity, spectral opacity and spectral absorptivity into a mathematical model (S4) for predicting the colour specifications of the printed product.

Abstract: A printing press includes at least one exchangeable cylinder (10, 12) that is rotatably supported in a machine frame, a movable bearing member (18) forming part of a bearing (44) for the exchangeable cylinder (12), and a sensor head (26, 28, 30) that is capable of receiving signals from a signalling device (22, 24, 32) that is mounted on one of the cylinders (10, 12) of the printing press, and the sensor head (26, 28, 30) is mounted on the movable bearing member (18) and is arranged to receive the signals from a signalling device (22, 24, 32) at least when the bearing member (18) is in a predetermined position.

Abstract: A method of adjusting a roller (18) in a rotary printing press (10), includes the steps of a) mounting the roller (18) in a preparation rack (24) so as to be rotatably supported therein, b) scanning the peripheral surface of the roller, thereby to detect a topography of the roller surface, c) deriving set data for the adjustment of the roller from the topography, and storing the set data, d) mounting the roller in the printing press (10), and e) adjusting the roller in accordance with the set data.

Abstract: A printing press having a roller and scanning equipment adapted to scan the peripheral surface of the roller while the roller rotates in the printing press.

Abstract: A method for calibrating a rotary printing press, in which a bearing structure for a printing cylinder is adjusted relative to another component of the printing press, and positions of the bearing structure are measured, including the steps of mounting a calibration tool on a mandrel that is supported in the bearing structure, said the calibration tool having at least one contact sensitive switch moving the bearing structure until the at least one switch contacts the other component and upon detection of a signal from the at least one switch storing a measured position of the bearing structure as a reference position.

Abstract: A method of exchanging printing units at a running rotary printing press, wherein a first printing unit is withdrawn from the printing medium, and a second printing unit for printing the same image with the same register is set against the printing medium, includes the steps of applying to the printing cylinder of the second printing unit, prior to start of the printing operation, a register printing block elevated relative to the regular printing block; prior to changeover of the printing units, setting the second printing unit against the printing medium such that register marks print with the register printing block without an image printing with the regular printing block; detecting register marks and adjusting the second printing unit register by reference to the detected register mark; and with the register adjusted, exchanging the printing units by withdrawing the first printing unit and setting the second printing unit.

Abstract: A method for knocking-off a web (12) round on a turret winder (10) by a knocking-off device (22) includes a pressure roller (24), in which the knocking-off device (22) and a coil (16) of the winder (10) are, through an abrupt relative movement, brought into a position in which the pressure roller (24) engages the periphery of the coil (16) and the abrupt movement is a pivotal movement (B) of the coil (16) about a pivotal axis that extends in parallel with the axes of rotation thereof.

Abstract: A method of adjusting a roller (18) in a rotary printing press (10), includes the steps of a) mounting the roller (18) in a preparation rack (24) so as to be rotatably supported therein, b) scanning the peripheral surface of the roller, thereby to detect a topography of the roller surface, c) deriving set data for the adjustment of the roller from the topography, and storing the set data, d) mounting the roller in the printing press (10), and e) adjusting the roller in accordance with the set data.

Abstract: A flexographic printing cylinder (10, 40) includes a cylinder body (20) made of a carbon fiber composite material and carrying a printing pattern on its peripheral surface (34), the printing pattern being formed by a polymer jacket layer (36) that is formed integrally with the cylinder body (20).

Abstract: A method for knocking-off a web (12) round on a turret winder (10) by a knocking-off device (22) includes a pressure roller (24), in which the knocking-off device (22) and a coil (16) of the winder (10) are, through an abrupt relative movement, brought into a position in which the pressure roller (24) engages the periphery of the coil (16) and the abrupt movement is a pivotal movement (B) of the coil (16) about a pivotal axis that extends in parallel with the axes of rotation thereof.

Abstract: A method of exchanging printing units at a running rotary printing press, wherein a first printing unit is withdrawn from the printing medium, and a second printing unit for printing the same image with the same register is set against the printing medium, includes the steps of applying to the printing cylinder of the second printing unit, prior to start of the printing operation, a register printing block elevated relative to the regular printing block; prior to changeover of the printing units, setting the second printing unit against the printing medium such that register marks print with the register printing block without an image printing with the regular printing block; detecting register marks and adjusting the second printing unit register by reference to the detected register mark; and with the register adjusted, exchanging the printing units by withdrawing the first printing unit and setting the second printing unit.

Abstract: A method for flexographic multi-color printing, wherein a print medium web is passed continuously through a flexographic printing press having at least two ink units, each ink unit including a printing cylinder, an anilox roller and an ink sup-ply system adapted to supply liquid ink of a specific color to the anilox roller, wherein the inks supplied in the different ink units differ in both, color and mass density, the method including the steps of mounting, in at least one of the ink units, an anilox roller having a larger diameter than the anilox roller of another one of the at least two ink units, and during printing, supplying the ink with the largest mass density to the anilox roller having the larger diameter.

Abstract: A method for shifting a doctor blade in its longitudinal direction, the doctor blade being set against a cylinder of a printing machine, wherein the shift movement of the doctor blade is such that, for most of the time of the print operation, the shift velocity of the doctor blade is in a range from 0 to 0.1 m/s, and a printing machine having a doctor blade assembly, including a doctor blade arranged to be set against a cylinder, and a shift mechanism for shifting the doctor blade in its longitudinal direction, such that the shift mechanism is adapted to execute the method.

Abstract: Printing machine having at least one impression cylinder (16), characterised in that the impression cylinder (16) has a cylinder body (44) made of a material which, in circumferential direction of the impression cylinder (16) has a linear thermal expansion coefficient of less than 2×10?6 K?1. The material may be a composite material, for example, a material containing carbon fibers, in particular a synthetic resin reinforced with carbon fibers.

Abstract: A method of manufacturing an anilox roller, in particular for a flexographic printing press, the anilox roller comprising a cylindrical core and a sleeve detachably held on the core and having at its surface an anilox layer with a grid pattern of pits, including the steps of mounting the sleeve on the core, and then forming the anilox layer on the sleeve.

Abstract: Gravure printing cylinder with a block carrier (12) having a metallic gravure layer (24) applied to its peripheral surface, with the block carrier being a self-supporting sleeve (12) made of carbon fiber composite material and supported on disks (14).

Abstract: A method for shifting a doctor blade in its longitudinal direction, the doctor blade being set against a cylinder of a printing machine, wherein the shift movement of the doctor blade is such that, for most of the time of the print operation, the shift velocity of the doctor blade is in a range from 0 to 0.1 m/s, and a printing machine having a doctor blade assembly, including a doctor blade arranged to be set against a cylinder, and a shift mechanism for shifting the doctor blade in its longitudinal direction, such that the shift mechanism is adapted to execute the method.

Abstract: A gravure printing machine having a device (14, 16) for applying ink onto a printing cylinder (10), including an ink supply system (16); wherein a stripping device (14) adapted to strip-off a layer of air that has been entrained by the printing cylinder (10) is arranged at the periphery of the printing cylinder (10) in relation to the ink supply system (16) in such a manner that the printing cylinder (10) will not come into substantial contact with air in a range between the stripping device (14) and the ink supply system.

Abstract: Printing machine with a machine frame (10) and at least two cylinders (16, 20) which cooperate during printing, and which are mounted in a framing (12, 14; 24) formed by the machine frame (10). The framing (12, 14; 24) includes a material which has, at least in a direction transverse to the axes of rotation on the cylinders (16, 20), a linear thermal expansion coefficient that is less than 2×10?6 K-1. The material can be a composite material, particularly a carbon fiber reinforced plastic.