Abstract: According to an example, an electrophotographic ink may include an adsorbent, a volatile fragrance, a resin and a carrier liquid.

Abstract: A printing apparatus is described comprising a photoconductor for receiving an electrostatic charge pattern corresponding to an image, and one or more developers for applying a colorant to the photoconductor representative of the image. The apparatus further comprises a transfer member for transferring the image from the photoconductor onto a substrate, wherein the transfer member has a substantially grounded potential.

Abstract: A method of controlling a laser unit in order to negate heat build-up caused by a laser modulation current, and eliminating artifacts caused by image related thermal effects. Upon receipt of an activation signal, an activation current is applied which causes lasing of the laser unit. Upon receipt of a deactivation signal, the method ceases lasing by selectively applying either an idle current below the activation current, or a cooling current below the idle current.

Abstract: A roller arrangement for printing apparatus comprises a first roller. The first roller comprises a plurality of cells. Each of the plurality of cells receives an amount of a coating material. The roller arrangement further comprises an extractor to remove at least a portion of the coating material from a selected set of the plurality of the cells.

Abstract: Multiple packages are manufactured by defining a package template, with at least one individualized image area, and selecting at least one image seed. For each package, an index key is selected and, based on the selected index key, a plurality of image attribute modifications are determined from within applicable ranges of image attribute modifications. The determined image attribute modifications are applied to the image seed or seeds to generate respective images, and the image or images are applied to the respective individualized image area of the package.

Abstract: Certain examples described herein relate to splice detection. In certain cases, a splice is detected in a web being conveyed towards a transfer member of the printing system. In certain cases, a print frame is identified from a sequence of pending print frames using successive repeat lengths of the sequence and a distance of the splice from the transfer member. The identified print frame is to be transferred from the transfer member across the splice. In certain cases, writing of the identified print frame onto a photo-imaging plate of the printing system is deferred. In certain examples, the web is disengaged from the transfer member following transfer of an image of a print frame preceding the identified print frame. The web is re-engaged with the transfer member so as to transfer an image of the identified print frame to the web from the transfer member after the splice is conveyed beyond the transfer member.

Abstract: In an example, a method includes determining, by a processor, a cumulative indication of defects present in linear sub-portions located in a common position of each of a plurality of substrate sheets bearing a printed image. The method may further comprise identifying, by the processor, a linear defect based on the cumulative indication of defects.

Abstract: An example apparatus includes a conveyor. The apparatus also includes a first developer unit. The first developer unit is to concentrate first printing liquid. The first developer unit also is to deliver the first printing liquid to the conveyor. The apparatus also includes a second developer unit. The second developer unit is to concentrate second printing liquid. The second developer also is to deliver the second printing liquid to the conveyor to form a thick layer of printing liquid comprising the first and second printing liquid.

Abstract: In an example, a liquid dispenser is for dispensing liquid into a liquid reservoir with reduced foam formation. The liquid dispenser has a baffle element, guiding element and a discharge element. The baffle element is to receive liquid, the guiding element is to guide liquid from the baffle element to the discharge element, and the discharge element is to discharge liquid into the liquid reservoir. The baffle element, the guiding element and the discharge element are arranged in cascade to flow liquid from the baffle element to the discharge element.

Abstract: In one example, an electromechanical device includes a removable component comprising an electronic identification tag. The apparatus also includes a plurality of tag readers disposed at a plurality of sectors in the apparatus to detect the electronic identification tag and signal strengths associated with the detected electronic identification tag, and send the signal strengths to a tracking system.

Abstract: In an example, a method includes applying a liquid print agent comprising a carrier fluid to a photoconductive surface and reducing a proportion of the carrier fluid in the liquid print agent on the photoconductive surface at a first location during a print cycle of a print apparatus. The method may further include, during a non-print cycle of the print apparatus, adding carrier fluid to the photoconductive surface at the first location.

Abstract: A method and apparatus for generating print data are described herein. An apparatus comprising an image processor (110) is configured to select a region of an image spanning an intersection between at least two adjacent sub-images that partition the image. The spanning region is divided based on a non-linear path that is determined on the basis of a user input, resulting in at least two modified adjacent sub-images. Print data operable to cause a printing device (150) to print the respective modified adjacent sub-images are generated on the basis of the dividing.

Abstract: There is provided a process for heat transfer printing, comprising: electrostatically printing a transparent release composition onto a transfer material (1) to form a release layer (2) disposed on the transfer material; (1) electrostatically printing an electrostatic ink composition to form an image layer (3) disposed on the release layer (2); applying a heat-activatable adhesive composition to the image layer to form a heat-activatable adhesive layer (4); contacting the heat-activatable adhesive layer (4) with a target substrate (5) under conditions such that the heat-activatable adhesive layer (4) is activated to adhere to the target substrate and the release layer (2) is softened; and separating the target substrate (5) and the transfer material (1) such that the heat-activatable layer (4), image layer (3) and release layer (2) are transferred to the target substrate.

Abstract: A cleaning unit for removing debris from an ink transfer surface includes a cleaning roller having: a microcellular material outer layer; a wetting module to supply cleaning fluid to the microcellular material outer layer of the cleaning roller; and an extractor to remove cleaning fluid and debris from the cleaning roller.

Abstract: In an example, a method includes determining, using a processor, a set of halftone screens each comprising tiles spanning a plurality of cells, wherein at least one screen is a non-orthogonal screen and the cells comprise parallelograms being defined by a first vector having a first length and second vector having a second length. A first and a second fundamental frequency may be determined for each of the screens using a projection of the first and of the second vector into each axis of a print apparatus reference frame, the first length and the second length. Using the first and second fundamental frequencies, it may be determined which screens are associated with moiré effects below a threshold.

Abstract: In an example, a method includes charging a photoconductive surface in a print apparatus and monitoring an electrical parameter associated with a proximity of a print apparatus component to the photoconductive surface. A relative spacing between the print apparatus component and the photoconductive surface may be changed and a contact between the print apparatus component and the photoconductive surface may be detected when the electrical parameter meets predetermined criteria.

Abstract: Herein is described a method of providing a printed label. The method comprises: providing a printed label substrate having disposed thereon an electrostatically printed ink; applying a UV curable overcoat composition to the printed ink, wherein the UV curable overcoat composition comprises (i) a component selected from UV curable monomers and UV curable oligomers, and (ii) a slip agent; curing the overcoat composition under UV irradiation with an output power of 2500 W or less. Printed labels and an ink and overcoat composition set are also described herein.

Abstract: In an example, a method of controlling voltage applied to a print blanket within a printing device includes printing a print job. During the printing, a null cycle trigger is received. In response to the trigger, a print blanket bias voltage is reduced from a print bias level to a null bias level.

Abstract: The present disclosure relates to an electrophotographic composition that comprises a polymer resin mixture and a liquid carrier. The polymer resin mixture comprises (i) an olefin polymer A having acid and/or ester side groups and a melt index of 22 to 100 g/10 min; and (ii) an olefin polymer B having a melt index of 1 to 20 g/10 min. The olefin polymer B forms 1 to 50 weight % of the polymer resin mixture.

Abstract: Herein is disclosed an intermediate transfer member for liquid electrophotographic printing. The intermediate transfer member may include at least one layer including a thermoplastic polyurethane. A liquid electrophotographic printer and a method of forming an intermediate transfer member are also described.