Abstract: In some examples, a heating apparatus includes a light emitting diode (LED) array comprising an LED to heat a target object, and a heat sink thermally coupled to the LED array, to dissipate heat from the LED array, the heat sink comprising a plurality of refrigerant paths to pass a refrigerant through the heat sink in a plurality of different directions.

Abstract: There is disclosed print agent drying unit 10, 20, 30 to dry print agent 40 on a substrate 14, the drying unit comprising: a substrate support 12 to support a substrate 14; an exciter 18, 28, 38 to excite a boundary layer of print agent 40 applied on the substrate 14, to thereby dissociate the boundary layer from the print agent; and a radiation source 16 to direct radiation energy to the substrate to dry the print agent. Methods of drying print agent 40 on a substrate 14 are also disclosed, including a method comprising: causing the substrate 14 to vibrate to dissociate a boundary layer of print agent 40 on the substrate 14; and heating the print agent 40 to dry the print agent 40.

Abstract: In one example, a media support includes a sheet of elongated suction cups. In another example, a media support includes an arrangement of elongated and/or circular suction cups in which the density of the suction cups varies between different parts of the support.

Abstract: A drying assembly comprises a plurality of electromagnetic energy sources arranged to dry printing fluid deposited onto a surface of a substrate, by evaporation of a solvent fluid therefrom. The drying assembly further comprises a conveyor system configured to move the substrate in a conveying direction, and a focusing system configured to focus electromagnetic energy from the plurality of electromagnetic energy sources to form a non-uniform heating pattern on the surface of the substrate. The non-uniform heating pattern comprises a plurality of spatially separated higher and lower intensity regions distributed along the conveying direction.

Abstract: Examples described herein include examples methods for generating varnish knockouts that include applying a fixer material to a surface of a print medium, selectively applying a print material over the fixer material to form an image, and applying an overcoat material to form a durable coating on areas over the image and a nondurable coating over other areas of the surface.

Abstract: In one example, a media support includes a sheet of elongated suction cups. In another example, a media support includes an arrangement of elongated and/or circular suction cups in which the density of the suction cups varies between different parts of the support.

Abstract: In one example of the disclosure, a system includes a chamber having an inlet to receive a print agent, an actuator operatively connected to the chamber, and a set of nozzles fluidly coupled to the chamber. The nozzles are orientated such that each nozzle of the set has a same boundary condition.

Abstract: In one example, halftone data comprising first data and second data representing a plurality of pixels in a halftone is generated. The first data associates a first subset of the plurality of pixels in the halftone with a first colorant, the first subset defining a first region in the halftone. The second data associates a second subset of the plurality of pixels in the halftone with a second colorant different from the first colorant, the second subset defining a second region in the halftone. The first subset of the plurality of pixels in the halftone and the second subset of the plurality of pixels in the halftone are mutually exclusive, and the first region is at least partially enclosed by the second region.

Abstract: An example heating apparatus comprises a light emitting diode (LED) array comprising at least one LED to heat a target object. The heating apparatus further comprises a heatsink thermally coupled to the LED array to dissipate heat from the LED array. The heatsink comprises a refrigerant path including an input to and an output from the refrigerant path to pass cooled refrigerant therethrough.

Abstract: A printer dryer device comprises a first drying unit, wherein the first drying unit comprises a first plurality of energy-emitting elements to dry a printing substance on a printing medium, wherein the first plurality of energy-emitting elements are electrically connected in series in the first drying unit. The printer dryer device further comprises a second drying unit, wherein the second drying unit comprises a second plurality of energy-emitting elements to dry the printing substance on the printing medium, wherein the second drying unit is arranged downstream from the first drying unit in a medium transport direction of the printing medium, and wherein the second plurality of energy-emitting elements are electrically connected in series in the second drying unit. At least one energy-emitting element among the second plurality of energy-emitting elements is not electrically connected in series to an energy-emitting element among the first plurality of energy-emitting elements.

Abstract: A method of depositing printing fluid on a sheet of corrugated media comprises determining a deformation of a sheet of corrugated media, adjusting control parameters for a plurality of nozzles based on the determined deformation, and depositing printing fluid from the plurality of nozzles onto the sheet of corrugated media according to the adjusted control parameters.

Abstract: A method of generating data representing a halftone screen comprises generating tonal data of a first colorant for a plurality of pixels according to a darkness level by assigning a tonal value to at least a first subset of the plurality of pixels, wherein said tonal value takes a value equal to any of a plurality of ordered tonal values. A difference between a maximal tonal value and a minimal tonal value assigned to pixels of the first subset is equal to or smaller than a predefined threshold. For a given darkness level, a number of pixels with the minimal tonal value is maximized. The darkness level is related to a ratio of the sum of the tonal values of all pixels of the plurality of pixels to the number of pixels of the plurality of pixels. A pixel having a tonal value greater than the minimal tonal value assigned to pixels of the first subset is adjacent to a pixel having at least the same tonal value and the tonal value of every pixel is equal to or smaller than a predefined maximal value.

Abstract: In an example, a print media transport apparatus comprises a plurality of pallets having a self-propulsion mechanism, and being to support print media. The pallets may circulate on an endless track comprising a printing zone, a descending zone and an ascending zone. A controller may control the self-propulsion mechanisms of the pallets such that a pallet on the descending zone is at least partially supported by another pallet which is ahead on the track, and a pallet on the ascending zone is at least partially driven by pallet which follows on the track.

Abstract: Examples described herein include examples methods for generating varnish knockouts that include applying a fixer material to a surface of a print medium, selectively applying a print material over the fixer material to form an image, and applying an overcoat material to form a durable coating on areas over the image and a nondurable coating over other areas of the surface.

Abstract: In one example, a media support includes a sheet of suction cups in which each suction cup has a port through which air may be evacuated from the cup. In another example, a detachable cover for a vacuum table includes: a sheet having a flat front surface, a flat back surface and multiple suction cups arranged across the front surface of the sheet. Each suction cup has a port to the back surface of the sheet to connect to a corresponding vacuum hole in the table when the cover is attached to the table.

Abstract: Examples described herein include method for calibrating LED modules in a curing engine. The method of calibrating UV curing modules includes receiving an uncured calibration image and initiating a curing operation that includes operating the curing modules according to a plurality of corresponding initial power level settings to apply radiant energy to the uncured calibration image to generate a cured calibration image. The method further includes receiving user input or information about an image characteristic of the cured calibration image from a user. The method then includes analyzing the user input to generate adjustments to the corresponding initial power level settings, and then applying the adjustments to the corresponding initial power level settings to generate a plurality of corresponding adjusted power level settings.

Abstract: Certain examples described herein relate to transporting sheets of print media. In one example, a media transport apparatus has a plurality of media transport sections including a first media transport section and a second media transport section offset from the first media transport section in a media transport direction. The media transport apparatus has a holding section arranged to receive a sheet of print media from the first media transport section. The holding section is moveable to deposit the sheet of print media upon the second media transport section.

Abstract: In one example, a media support includes a continuous loop belt and multiple suction cups arranged along the outer perimeter of the belt. Each suction cup has a port aligned with a hole in the belt so that air may be evacuated from the suction cup when connected to a vacuum source.

Abstract: In one example, a media support includes a sheet of suction cups in which each suction cup has a port through which air may be evacuated from the cup. In another example, a detachable cover for a vacuum table includes: a sheet having a flat front surface, a flat back surface and multiple suction cups arranged across the front surface of the sheet Each suction cup has a port to the back surface of the sheet to connect to a corresponding vacuum hole in the table when the cover is attached to the table.

Abstract: In an example, there is provided a method including: receiving, at a processor, data specifying the shape of a blank to form a folded article; and determining, using the processor, based on the received data, a suction array layout to hold the blank against a media support, wherein the suction array layout conforms to the shape of the blank.