Abstract: In some examples, an ink feed system for providing and feeding printing ink to an inking unit of an intaglio printing unit includes an inking device in the inking unit for inking a first inking unit cylinder. A provision device includes a storage receptacle with an ink reservoir of printing ink that is fed via an outlet and a line to the inking device. Furthermore, a wall of the storage receptacle encompassing the outlet can be heated and/or a metering device may be provided in the line path to support and/or effectuate delivery of the printing ink from the storage receptacle. On an output side, the metering device may provide a mass flow or volume flow that correlates with a working speed of the metering device via a defined relationship, and the metering device may be connected to a control device to control the working speed of the metering device.

Abstract: In some examples, a security element includes a substrate that, on one of its sides, includes at least one security feature extending over a first area, the security feature being configured in the form of a three-dimensional intaglio structure. A first ink group in the security feature includes a plurality of first raised image elements containing intaglio printing ink of the first color, and at least one second ink group in the security feature includes a plurality of raised image elements containing intaglio printing ink of a second color that differs from the first color, and these are provided and arranged offset and spaced apart from one another such that they form an optically variable structure and/or at least some of the mutually adjacent image elements, which differ from one another in the color, occlude and/or expose one another to varying degrees from a varying viewing angles.

Abstract: In some examples, an ink feed system for providing and feeding printing ink to an inking unit of an intaglio printing unit includes an inking device in the inking unit for inking a first inking unit cylinder. A provision device includes a storage receptacle with an ink reservoir of printing ink that is fed via an outlet and a line to the inking device. Furthermore, a wall of the storage receptacle encompassing the outlet can be heated and/or a metering device may be provided in the line path to support and/or effectuate delivery of the printing ink from the storage receptacle. On an output side, the metering device may provide a mass flow or volume flow that correlates with a working speed of the metering device via a defined relationship, and the metering device may be connected to a control device to control the working speed of the metering device.

Abstract: In some examples, a gravure printing unit for printing onto a substrate includes a forme cylinder that has, on an outer circumference, a pattern of recesses for forming an image. The gravure printing unit further includes an inking unit for inking the pattern of recesses on the forme cylinder. The inking unit includes a first inking unit cylinder having line-like recesses on an outer cylindrical surface that correspond to line-like recesses of the pattern of recesses on the outer circumference of the forme cylinder. Two end-aligned line-like recesses on the outer cylindrical surface of the first inking unit cylinder are separated by a supporting ridge and correspond to a single uninterrupted line-like recess on the circumference of the forme cylinder. An upper surface of the supporting ridge lies at a level of an undisrupted region of the outer cylindrical surface of the first inking unit cylinder.

Abstract: A gravure printing unit, which is usable for printing on a substrate, according to a gravure printing method, includes a forme cylinder which comprises, on its circumference, an image-forming pattern of recesses, and an inking unit, by the use of which the pattern of recesses provided on the forme cylinder is inked. The forme cylinder can be partially inked from an inking device via a first inking unit cylinder which has recesses in the region of its outer cylindrical surface that correspond to recesses on the forme cylinder, and via a second inking unit cylinder, which cooperates with the first inking unit cylinder and which comprises ink-transferring elements or raised areas on its circumference. For controlling the transfer of ink, the first inking unit cylinder having the recesses, is configured as being temperature controllable or has a temperature control device in the ink unit supply. Alternatively, a printing pressure between inking units cylinders can be varied during operation.

Abstract: In some examples, a gravure printing unit for printing onto a substrate includes a forme cylinder that has an image-forming pattern of recesses, and comprising an inking unit for inking the pattern of recesses on the forme cylinder. The inking unit includes a first inking unit cylinder having recesses that correspond to the recesses on the forme cylinder, an inking device, and a second inking unit cylinder that cooperates with the first inking unit cylinder. The linear recesses on the first inking unit cylinder that correspond to continuous linear recesses on the forme cylinder include at least one supporting ridge, which interrupts the recess on the first inking unit cylinder that corresponds to the continuous linear recess on the forme cylinder, and the upper surface of which lies at the level of an undisrupted and non-engraved outer cylindrical surface of the first inking unit cylinder.

Abstract: A gravure printing unit is usable for printing onto substrate according to a gravure printing method. The gravure printing unit has a forme cylinder, which comprises, on its circumference, an image-forming pattern of recesses, and has an inking unit for inking the pattern of recesses provided on the forme cylinder. The inking unit comprises a first inking unit cylinder, which comprises recesses in a region of its outer cylindrical surface that correspond to the recesses on the forme cylinder, and which form a nip point downstream with a second inking unit cylinder, which comprises, on its circumference, ink-transferring elevations or raised areas. The recesses are formed on the outer cylindrical surface of an ink transfer forme sheath.

Abstract: In some examples, a security element includes a substrate that, on one of its sides, includes at least one security feature extending over a first area, the security feature being configured in the form of a three-dimensional intaglio structure. A first ink group in the security feature includes a plurality of first raised image elements containing intaglio printing ink of the first color, and at least one second ink group in the security feature includes a plurality of raised image elements containing intaglio printing ink of a second color that differs from the first color, and these are provided and arranged offset and spaced apart from one another such that they form an optically variable structure and/or at least some of the mutually adjacent image elements, which differ from one another in the color, occlude and/or expose one another to varying degrees from a varying viewing angles.

Abstract: Recess printing units are usable for printing on a substrate and using associated methods for operation. The recess printing units comprise an intaglio printing cylinder, which provides an image-forming pattern of recesses on its circumference; and an inking unit for applying ink to the pattern of recesses that are provided on the intaglio printing cylinder. The inking unit comprises a first inking unit cylinder which has, in a region of its lateral surface, recesses corresponding to the recesses in the intaglio printing cylinder and to which recesses ink can be supplied by an ink application device in the region of an application point lying on the circumference of the first inking unit cylinder.

Abstract: A gravure printing unit is usable for printing onto substrate according to a gravure printing method. The gravure printing unit has a forme cylinder, which comprises, on its circumference, an image-forming pattern of recesses, and has an inking unit for inking the pattern of recesses provided on the forme cylinder. The inking unit comprises a first inking unit cylinder, which comprises recesses in a region of its outer cylindrical surface that correspond to the recesses on the forme cylinder, and which form a nip point downstream with a second inking unit cylinder, which comprises, on its circumference, ink-transferring elevations or raised areas. The recesses are formed on the outer cylindrical surface of an ink transfer forme sheath.

Abstract: A gravure printing unit, which is usable for printing on a substrate, according to a gravure printing method, includes a forme cylinder which comprises, on its circumference, an image-forming pattern of recesses, and an inking unit, by the use of which the pattern of recesses provided on the forme cylinder is inked. The forme cylinder can be partially inked from an inking device via a first inking unit cylinder which has recesses in the region of its outer cylindrical surface that correspond to recesses on the forme cylinder, and via a second inking unit cylinder, which cooperates with the first inking unit cylinder and which comprises ink-transferring elements or raised areas on its circumference. For controlling the transfer of ink, the first inking unit cylinder having the recesses, is configured as being temperature controllable or has a temperature control device in the ink unit supply. Alternatively, a printing pressure between inking units cylinders can be varied during operation.

Abstract: Recess printing units are usable for printing on a substrate and using associated methods for operation. The recess printing units comprise an intaglio printing cylinder, which provides an image-forming pattern of recesses on its circumference; and an inking unit for applying ink to the pattern of recesses that are provided on the intaglio printing cylinder. The inking unit comprises a first inking unit cylinder which has, in a region of its lateral surface, recesses corresponding to the recesses in the intaglio printing cylinder and to which recesses ink can be supplied by an ink application device in the region of an application point lying on the circumference of the first inking unit cylinder.

Abstract: An inking system for inking an intaglio printing cylinder of an intaglio printing press is designed to perform a selective transfer of ink to one or more intaglio printing mediums by way of a selective inking cylinder provided in at least one device. The selective inking cylinder carries a selective inking plate that receives ink supplied by an associated inking unit. The selective inking plate comprises a coating that is selectively structured to exhibit ink-repellent portions and perform selective transfer of ink at locations corresponding to engraved areas of the one or more intaglio printing mediums that are to be inked with the ink supplied by the associated inking unit. The selective transfer of ink is performed indirectly from the selective inking cylinder to the one or more intaglio printing mediums via an ink collecting cylinder and/or via a chablon cylinder carrying a chablon plate.

Abstract: There are described various embodiments of an inking system for inking an intaglio printing cylinder (8) of an intaglio printing press (1I; 1II; 1III ; 1IV; 1V), which intaglio printing cylinder carries one or more intaglio printing mediums (8a, 8b, 8c) that are inked by means of a plurality of inking devices (95; 95*; 95**; 905; 905*). The inking system is designed to perform a selective transfer of ink to the one or more intaglio printing mediums by means of a selective inking cylinder (98; 98*; 98**) provided in at least one of the inking devices, preferably in each of the inking devices.

Abstract: It is especially described a control process for intaglio printing, in particular for printing paper securities, such as banknotes. This control process includes defining on an intaglio printing plate (80) control areas (150, 151-155; 170, 171-179) designed in such a manner as to allow in particular evaluation of effects of the printing pressure applied during printing of a substrate by means of the intaglio printing plate (80) and evaluation of effects of the ink coverage applied during inking of the intaglio printing plate (80), which control areas (150, 151-155; 170, 171-179) are engraved in a portion of the intaglio printing plate (80) in order to produce corresponding printed control zones (160, 161-165) on the substrate. The process further includes carrying out of measurements in the printed control zones allowing evaluation of the printing pressure applied during printing of the substrate as well as of the ink coverage applied during inking of the intaglio printing plate (80).

Abstract: It is especially described a control process for intaglio printing, in particular for printing paper securities, such as banknotes. This control process includes defining on an intaglio printing plate (80) control areas (150, 151-155; 170, 171-179) designed in such a manner as to allow in particular evaluation of effects of the printing pressure applied during printing of a substrate by means of the intaglio printing plate (80) and evaluation of effects of the ink coverage applied during inking of the intaglio printing plate (80), which control areas (150, 151-155; 170, 171-179) are engraved in a portion of the intaglio printing plate (80) in order to produce corresponding printed control zones (160, 161-165) on the substrate. The process further includes carrying out of measurements in the printed control zones allowing evaluation of the printing pressure applied during printing of the substrate as well as of the ink coverage applied during inking of the intaglio printing plate (80).