An image based correction system compensates for the image quality artifacts induced by thermal ghosting on evolving imaging member surfaces. With thermal ghosting directly tied to previous image content, a feed forward system determines thermal ghosting artifacts based on images previously rendered and generates an open loop gray-level correction to a current image that mitigates undesirable ghosting. For example, the correction system compensates for the thermal ghosting by making the current image lighter in areas that will be imaged onto warmer blanket regions, thereby cancelling out TRC differences between different temperature regions. A temperature sensor is used to measure the temperature of the imaging blanket due to the stresses induced by the image. This data is used to learn the parameters of the temperature model periodically during operation, and used in subsequent corrections to mitigate thermal ghosting in spite of changes in blanket properties over use and time.

A roller device includes a roller, an electronic device, a slip ring, a hood member, and a duct. The electronic device is disposed in an interior of the roller. The slip ring supplies electric power to the electronic device. The hood member covers a region between a rotating shaft of the slip ring and an end portion of the roller. The duct covers the slip ring, and extends in a direction away from the roller.

A method is provided for configuring a drying device in a printing machine, in particular in a value document printing machine. The printing machine has at least one printing unit which comprises an imaging cylinder having a plurality of imaging printing elements or groups of imaging printing elements which are arranged in rows and columns on its circumference. A drying device has a dryer, by which print material, passing through the dryer, is subject to radiation. The drying device is configured for ongoing or upcoming production in such a way that the print material passing through the dryer, in order to be dried, is subjected to radiation in a plurality of tracks spaced from each other by non-irradiated tracks according to the same switch-on and switch-off sequence extending over cycle length. The configuration takes place with regard to one of a lateral position and a width of the tracks to be subject to two radiation by the dryer using product-related data or information regarding one of the number and the size and the position of value items to be printed next to each other on the print material portion and one of using data which comes from a device for image capture and an evaluation comprised by the printing machine or provided in parallel to such a device.

A machine for digital printing on tape, which comprises a frame that supports elements of entraining at least one tape along an advancement path and is provided with at least one printing assembly, which comprises at least one ink-jet printing head; downstream of the printing assembly, along the advancement direction of the tape, there is at least one assembly for drying the inks applied to the tape; the drying assembly comprises a temperature-adjustable drum for supporting and entraining the tape, adhesion elements adapted to allow the retention in adhesion of the tape on the outer lateral surface of the drum, and hot air emitter elements which face at least one portion of the outer lateral surface of the drum.

A web printing press is provided. The web printing press includes at least one printing unit printing images on a web, at least one press component in direct contact with the web, a cutting device for cutting the web into sheets and a controller transmitting a virtual master signal to the at least one printing unit and at least one press component. A sensor senses the at least one press component or directly senses the web downstream of the at least one print unit and generates a sensor signal. A processor receives the sensor signal and the virtual master signal, the processor transmits a modified virtual master signal to the cutting device as a function of the received sensor signal. Methods are also provided.

A method is provided for configuring a drying device in a printing machine, in particular in a value document printing machine. The printing machine has at least one printing unit which comprises an imaging cylinder having a plurality of imaging printing elements or groups of imaging printing elements which are arranged in rows and columns on its circumference. A drying device has a dryer, by which print material, passing through the dryer, is subject to radiation. The drying device is configured for ongoing or upcoming production in such a way that the print material passing through the dryer, in order to be dried, is subjected to radiation in a plurality of tracks spaced from each other by non-irradiated tracks according to the same switch-on and switch-off sequence extending over cycle length. The configuration takes place with regard to one of a lateral position and a width of the tracks to be subject to two radiation by the dryer using product-related data or information regarding one of the number and the size and the position of value items to be printed next to each other on the print material portion and one of using data which comes from a device for image capture and an evaluation comprised by the printing machine or provided in parallel to such a device.

A printing machine for printing on a printing substrate web includes a plurality of inline flexographic printing units which are disposed in a plane accessible to an operator of the machine. Each one of the two flexographic printing units of a respective duplex printing station includes a respective impression cylinder and a dryer disposed between the two impression cylinders along a path of web travel of the web of printing substrate. A method of operating the printing machine is also provided.

Aspects of the present disclosure relate to methods and apparatuses for printing and curing energy curable inks printed on a substrate having an onset temperature T.sub.onset (C). The printing systems may include a printing station and a light source. During operation, the printing station deposits energy curable ink onto a first surface of the substrate to define a printed region, and the light source directs ultraviolet light onto the first surface of the substrate to define an illumination zone on the first surface of the substrate. The substrate is advanced in a machine direction to advance the printed region through the illumination zone to cure the energy curable ink. While the printed region advances through the illumination zone, the ultraviolet light heats the substrate from an initial temperature T.sub.in (C) entering the illumination zone to a maximum temperature T.sub.max (C), wherein T.sub.max (C)T.sub.onset (C).

A thermal roller (1) includes: a cylindrical body (2) extending along a longitudinal direction (X-X), the cylindrical body (2) including at least one inner tubular element (3) and at least one outer tubular element (4) that is concentrically arranged around the inner tubular element (3), the inner tubular element (3) includes an outer diameter d and the outer tubular element 4 includes an inner diameter D, being D>d; two hubs (6), each arranged at one end of the cylindrical body (2); at least one heat-exchange chamber (10) realized between the inner tubular element (3) and the outer tubular element (4). The roller includes: a coating layer (11) for the inner tubular element (3) made of plastics, and at least one helical channel (13) between the coating layer (11) and the outer tubular element (4). The helical channel (13) is realized at least partially in the coating layer (11).