Based on evaporation of fountain solution from a rotating blanket cylinder to create an image that may be inked and printed, a digitally addressable heater array at or just below the blanket surface evaporates deposited fountain solution and forms a fountain solution latent image on the surface. The heater array has controllable heating elements (e.g., field effect transistors, thin film transistors) that provide a transient heat pattern on the surface to evaporate the fountain solution. Heat is generated by current flow in the heating elements, and power developed by the heating circuit is the product of source-drain voltage and current in the channel. Current may be supplied along data lines by an external voltage controlled by digital electronics to provide the desired heat at heating elements addressed by a specific gate line. The heater array may include a current return line that may be a 2-dimensional mesh.

Fountain solution latent images are provided on an inking blanket without using laser-induced evaporation systems. Approaches include a rotatable charge retentive surface configured to receive an unfused toned electrostatic pattern of toner particles adhered thereto via electrophotography. The toner includes small diameter polymeric or inorganic particles that may have no color pigment to appear transparent or translucent. Fountain solution is disposed on at least one of the toner, the charge retentive surface and a transfer substrate. The transfer substrate is adjacent the charge retentive surface and forms a nip therebetween, with the transfer substrate sandwiching the unfused toned electrostatic pattern of toner particles and fountain solution against the charge retentive surface at the nip. Fountain solution sandwiched between the surfaces splits as the surfaces separate downstream the nip, leaving a fountain solution latent image remaining on the transfer member surface based on the electrostatic charged pattern on the charge retentive surface.

A device is provided for aligning magnetic or magnetizable particles, which are contained in a coating that is applied to a first side of a web-type or a sheet-type substrate. An application device is arranged in the transport path of the substrate, by the use of which, the coating is applied or is applicable to the first side of the substrate, in at least one application site. A first cylinder, which is embodied as a magnetic cylinder, is arranged in the transport path of the substrate to be transported downstream of the application device and comprises a plurality of elements creating a magnetic field in the region of the outer periphery of the first cylinder. Another cylinder, which is embodied as a magnetic cylinder, is arranged in the transport path of the substrate to be transported and comprises a plurality of elements creating a magnetic field in the region of the outer periphery of that cylinder. A drying device or an hardening device is arranged on the transport path between a site of a winding-on of the substrate on the first cylinder and a site of a winding-on of the other cylinder. The first cylinder, which is embodied as the magnetic cylinder, is arranged in the transport path of the substrate to be transported on the second side thereof. The drying or the hardening device is oriented in the transport path of the substrate to be transported on the first side thereof.

A device is provided for aligning magnetic or magnetizable particles, which are contained in a coating that is applied to a first side of a web-type or a sheet-type substrate. An application device is arranged in the transport path of the substrate, by the use of which, the coating is applied or is applicable to the first side of the substrate, in at least one application site. A first cylinder, which is embodied as a magnetic cylinder, is arranged in the transport path of the substrate to be transported downstream of the application device and comprises a plurality of elements creating a magnetic field in the region of the outer periphery of the first cylinder. Another cylinder, which is embodied as a magnetic cylinder, is arranged in the transport path of the substrate to be transported and comprises a plurality of elements creating a magnetic field in the region of the outer periphery of that cylinder. A drying device or an hardening device is arranged on the transport path between a site of a winding-on of the substrate on the first cylinder and a site of a winding-on of the other cylinder. The first cylinder, which is embodied as the magnetic cylinder, is arranged in the transport path of the substrate to be transported on the second side thereof. The drying or the hardening device is oriented in the transport path of the substrate to be transported on the first side thereof.

The invention relates to a device for producing security elements (03) on a substrate (02), said device having a first printing couple (21; 22), by means of which substrate (02) being conveyed along a transport path is and/or can be printed with a plurality of first print image elements (12) spaced apart from one another using a first coating medium (11) that contains magnetic particles; a first magnetic cylinder (41), arranged downstream of the first printing couple (21; 22) in the transport path and comprising magnetic elements (43) on its outer circumference; a second magnetic cylinder (42), arranged downstream of the first magnetic cylinder (41) in the transport path and likewise comprising magnetic elements (43) on its outer circumference; and a drying and/or curing device (52), associated with or positioned downstream of the second magnetic cylinder (42) in the transport path, by means of which at least the coating medium (13) of a plurality of second print image elements (14), printed onto the substrate (02) and spaced apart from one another, is and/or can be dried and/or cured at least superficially and/or at least each partially, wherein in the transport path between the first and the second magnetic cylinder (41; 42) a second printing couple (31; 32) is provided, by means of which the substrate (02) is and/or can be printed with the spaced-apart second print image elements (14; 12) using the second coating medium (13) that contains magnetic particles, and wherein a drying and/or curing device (51) positioned upstream of the second printing couple (31; 32) is associated with or positioned downstream of the first magnetic cylinder (41) in the transport path, by means of which device the coating medium (11) containing magnetic particles of the first print image elements (12) printed by the first printing couple (21; 22) is and/or can be dried and/or cured at least superficially and/or at least each partially.

The invention relates to a device for producing security elements (03) on a substrate (02), said device having a first printing couple (21; 22), by means of which substrate (02) being conveyed along a transport path is and/or can be printed with a plurality of first print image elements (12) spaced apart from one another using a first coating medium (11) that contains magnetic particles; a first magnetic cylinder (41), arranged downstream of the first printing couple (21; 22) in the transport path and comprising magnetic elements (43) on its outer circumference; a second magnetic cylinder (42), arranged downstream of the first magnetic cylinder (41) in the transport path and likewise comprising magnetic elements (43) on its outer circumference; and a drying and/or curing device (52), associated with or positioned downstream of the second magnetic cylinder (42) in the transport path, by means of which at least the coating medium (13) of a plurality of second print image elements (14), printed onto the substrate (02) and spaced apart from one another, is and/or can be dried and/or cured at least superficially and/or at least each partially, wherein in the transport path between the first and the second magnetic cylinder (41; 42) a second printing couple (31; 32) is provided, by means of which the substrate (02) is and/or can be printed with the spaced-apart second print image elements (14; 12) using the second coating medium (13) that contains magnetic particles, and wherein a drying and/or curing device (51) positioned upstream of the second printing couple (31; 32) is associated with or positioned downstream of the first magnetic cylinder (41) in the transport path, by means of which device the coating medium (11) containing magnetic particles of the first print image elements (12) printed by the first printing couple (21; 22) is and/or can be dried and/or cured at least superficially and/or at least each partially.

An end piece suitable for forming a spacer for a roll having two concentric tubes with axis, including spokes connecting two inner and outer cylindrical portions, and is where a fluid circuit originating from the center towards the periphery includes a first circumferential groove arranged in the inner cylindrical portion and a second circumferential groove arranged in the outer cylindrical portion connected by at least one pipe, such that the end piece makes it possible to reduce the weight of the roll by approximately 20%, to facilitate the balancing of the roll while ensuring accessibility to the inside of the roll between the two tubes and to enable easy mounting without indexing due to the circumferential grooves, and where the end piece with spokes enables access to the inside of the roll when it is mounted and thus enables both more accurate balancing than with solid end pieces that require the piercing of the outer tube and the invisibility of this balancing from the outside of the roll.

An end piece suitable for forming a spacer for a roll having two concentric tubes with axis, including spokes connecting two inner and outer cylindrical portions, and is where a fluid circuit originating from the center towards the periphery includes a first circumferential groove arranged in the inner cylindrical portion and a second circumferential groove arranged in the outer cylindrical portion connected by at least one pipe, such that the end piece makes it possible to reduce the weight of the roll by approximately 20%, to facilitate the balancing of the roll while ensuring accessibility to the inside of the roll between the two tubes and to enable easy mounting without indexing due to the circumferential grooves, and where the end piece with spokes enables access to the inside of the roll when it is mounted and thus enables both more accurate balancing than with solid end pieces that require the piercing of the outer tube and the invisibility of this balancing from the outside of the roll.

A cylinder is usable, in particular, for aligning magnetic of magnetizable particles, which are contained in a coating medium that is applied to a first side of a web-like or a sheet-like substrate, which cylinder, in the region of its outer circumference, has a plurality of elements effecting a magnetic field, magnetic elements for short. The magnetic elements are arranged in or on a plurality of ring elements that are spaced axially apart from one another and that are positionable in the axial direction on a shaft, in or on which ring elements, in turn, a plurality of magnetic elements are respectively arranged one after the other in the circumferential direction. At least two adjacent ring elements, each have a covering element, forming a part of the cylindrical lateral surface of the cylinder and extending in the circumferential direction, at least over the circumferential region populated with magnetic elements. The covering elements of two ring elements adjacent to each other have, on their sides facing each other in the axial direction, a plurality of projections alternating in the circumferential direction with recesses and offset in a circumferential direction in such a way that, during a relative movement of the two ring elements towards each other, the projections on the covering element of one ring element engage, in the manner of teeth, in corresponding recesses of the other ring element, and, as seen in the circumferential direction, can overlap. A security paper printing machine, having such a cylinder, is also disclosed.

A cylinder is usable, in particular, for aligning magnetic of magnetizable particles, which are contained in a coating medium that is applied to a first side of a web-like or a sheet-like substrate, which cylinder, in the region of its outer circumference, has a plurality of elements effecting a magnetic field, magnetic elements for short. The magnetic elements are arranged in or on a plurality of ring elements that are spaced axially apart from one another and that are positionable in the axial direction on a shaft, in or on which ring elements, in turn, a plurality of magnetic elements are respectively arranged one after the other in the circumferential direction. At least two adjacent ring elements, each have a covering element, forming a part of the cylindrical lateral surface of the cylinder and extending in the circumferential direction, at least over the circumferential region populated with magnetic elements. The covering elements of two ring elements adjacent to each other have, on their sides facing each other in the axial direction, a plurality of projections alternating in the circumferential direction with recesses and offset in a circumferential direction in such a way that, during a relative movement of the two ring elements towards each other, the projections on the covering element of one ring element engage, in the manner of teeth, in corresponding recesses of the other ring element, and, as seen in the circumferential direction, can overlap. A security paper printing machine, having such a cylinder, is also disclosed.