Abstract: An example apparatus includes a conveyor. The apparatus also includes a developer unit. The developer unit is to concentrate printing liquid. The developer unit also is to deliver the printing liquid to the conveyor as a thick layer on the conveyor.

Abstract: Described herein is a method for priming a print substrate for subsequently receiving a liquid electrophotographic (LEP) inkin which a surface of a print substrate is coated with a first primer using an analogue printing technique and a second primer is digitally printed to the surface of the print substrate coated with the first primer.

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: According to one example, there is provided an electrostatic printer. The printer comprises a photoconductor member, an imaging unit to generate a latent electrostatic image on the photoconductor member, an interface to receive a developer unit comprising a colored toner, the developer unit to develop a colored toner image on the photoconductor member using an associated base developer voltage, and a controller. The controller is to obtain image data comprising color separation data representing a variant of the colored toner, to control the imaging unit to generate a latent electrostatic image on the photoconductor member in accordance with the obtained color separation data, to determine a variant developer voltage corresponding to the variant of the colored toner, and to control the developer unit to develop a toner image on the photoconductor member using the variant developer voltage to develop a toner image corresponding to the variant of the colored toner.

Abstract: A method of operating an electrophotographic printer (100) to control the optical density of a printed image is described. The method comprises providing a printing substance on a transfer member (104); emitting a pulse of heat to heat the printing substance on the transfer member to increase flowability of the printing substance on the transfer member; and transferring, from the transfer member to a substrate (108), the printing substance heated by the pulse of heat so as to provide the printed image on the substrate.

Abstract: In one example, a system for transferring an ink image from a photoconductor to a print substrate includes a transfer member having a light absorbing exterior surface to receive a liquid LEP ink image from the photoconductor and to release a molten toner layer to a print substrate and a light source to expose a width of the surface carrying the liquid ink image to a light beam delivering enough power to transform the liquid ink image into a molten toner layer.

Abstract: In an example, an apparatus is described that includes a photosensitive imaging plate, an intermediate transfer member, and a heating unit. The photosensitive imaging plate attracts a layer of printing fluid. The intermediate transfer member contacts the photosensitive imaging plate and receives the layer of printing fluid from the photosensitive imaging plate. The heating unit includes an array of individually addressable heating elements and heats the intermediate transfer member in a manner that is spatially selective along two axes: a first axis in a direction of a width of the intermediate transfer member and a second axis in a direction of a rotation of the intermediate transfer member.

Abstract: Apparatus is described which, in use, applies a thin film of a wetting agent, such as water or a water-based solution, onto paper or other print medium before applying a liquid toner. The wetting agent is applied at a predetermined distance from an image transfer area. The wetting agent acts to promote adhesion of the liquid toner to the print medium. The adhesion of the liquid toner to the print medium is further improved by supplying the wetting agent at a temperature higher than room temperature.

Abstract: Disclosed herein is a method for electrostatic printing, wherein the method comprises (a) providing an ink composition comprising particles comprising a resin, wherein the ink composition contains less than 0.3 mg of charge director per g of solids in the ink composition; (b) passing the ink composition between a first electrode and a developer roller, wherein sufficient potential is applied between the developer roller and the electrode such that the resin particles are charged and adhere to the developer roller; (c) transferring at least some of the particles from the developer roller to a photoimaging plate to form an image on the photoimaging plate; and (d) transferring the image from the photoimaging plate to a print medium. Also disclosed here is an apparatus for carrying out the method, and a print medium printed using the method.

Abstract: Apparatus is described which, in use, applies a thin film of a wetting agent, such as water or a water-based solution, onto paper or other print medium before applying a liquid toner. The wetting agent is applied at a predetermined distance from an image transfer area. The wetting agent acts to promote adhesion of the liquid toner to the print medium. The adhesion of the liquid toner to the print medium is further improved by supplying the wetting agent at a temperature higher than room temperature.

Abstract: In some examples, an image forming apparatus includes a photoconductive member to move in a rotational direction, a charging unit to charge the photoconductive member, a discharging unit to discharge a portion of the photoconductive member to form a latent image thereon, and a plurality of ink applicator units to sequentially apply a plurality of ink layers, respectively, toward the latent image to form an ink image. The image forming apparatus may also include an image transfer blanket to receive the ink image including the plurality of ink layers from the photoconductive member.

Abstract: Apparatus is described which, in use, applies a thin film of a wetting agent, such as water or a water-based solution, onto paper or other print medium before applying a liquid toner. The wetting agent is applied at a predetermined distance from an image transfer area. The wetting agent acts to promote adhesion of the liquid toner to the print medium. The adhesion of the liquid toner to the print medium is further improved by supplying the wetting agent at a temperature higher than room temperature.

Abstract: An image forming apparatus includes a photoconductive member to move in a rotational direction, a charging unit to charge the photoconductive member, a discharging unit to discharge a portion of the photoconductive member to form a latent image thereon, and a plurality of ink applicator units to sequentially apply a plurality of ink layers, respectively, toward the latent image to form an ink image. The image forming apparatus may also include an image transfer blanket to receive the ink image including the plurality of ink layers from the photoconductive member.

Abstract: Disclosed herein is a method for electrophotographic printing, the method comprising: transferring, separately, from a photo imaging plate, a plurality of images formed from different colored electrostatic ink compositions to an intermediate transfer member to form a print image on the intermediate transfer member; providing a print substrate that has been wetted with a protic solvent; transferring the print image to the print substrate. Also disclosed herein is an apparatus for electrophotographic printing.

Abstract: A method to determine a quantity of a liquid in a container. In the method, a actuator is controlled to rotate a member in the container at a first speed. A measurement of electrical current drawn by the actuator at the first speed is received. A quantity of liquid in the container is determined through a look-up table and the measured electrical current.

Abstract: Disclosed herein is a method for electrostatic printing, wherein the method comprises (a) providing an ink composition comprising particles comprising a resin, wherein the ink composition contains less than 0.3 mg of charge director per g of solids in the ink composition; (b) passing the ink composition between a first electrode and a developer roller, wherein sufficient potential is applied between the developer roller and the electrode such that the resin particles are charged and adhere to the developer roller; (c) transferring at least some of the particles from the developer roller to a photoimaging plate to form an image on the photoimaging plate; and (d) transferring the image from the photoimaging plate to a print medium. Also disclosed here is an apparatus for carrying out the method, and a print medium printed using the method.

Abstract: Disclosed herein is a method for electrostatic printing, wherein the method comprises (a) providing an ink composition comprising particles comprising a resin, wherein the ink composition contains less than 0.3 mg of charge director per g of solids in the ink composition; (b) passing the ink composition between a first electrode and a developer roller, wherein sufficient potential is applied between the developer roller and the electrode such that the resin particles are charged and adhere to the developer roller; (c) transferring at least some of the particles from the developer roller to a photoimaging plate to form an image on the photoimaging plate; and (d) transferring the image from the photoimaging plate to a print medium. Also disclosed here is an apparatus for carrying out the method, and a print medium printed using the method.

Abstract: Disclosed herein is a method for electrophotographic printing, the method comprising: transferring, separately, from a photo imaging plate, a plurality of images formed from different colored electrostatic ink compositions to an intermediate transfer member to form a print image on the intermediate transfer member; providing a print substrate that has been wetted with a protic solvent; transferring the print image to the print substrate. Also disclosed herein is an apparatus for electrophotographic printing.

Abstract: Apparatus is described which, in use, applies a thin film of a wetting agent, such as water or a water-based solution, onto paper or other print medium before applying a liquid toner. The wetting agent is applied at a predetermined distance from an image transfer area. The wetting agent acts to promote adhesion of the liquid toner to the print medium. The adhesion of the liquid toner to the print medium is further improved by supplying the wetting agent at a temperature higher than room temperature.

Abstract: Disclosed herein is a method for electrostatic printing, wherein the method comprises (a) providing an ink composition comprising particles comprising a resin, wherein the ink composition contains less than 0.3 mg of charge director per g of solids in the ink composition; (b) passing the ink composition between a first electrode and a developer roller, wherein sufficient potential is applied between the developer roller and the electrode such that the resin particles are charged and adhere to the developer roller; (c) transferring at least some of the particles from the developer roller to a photoimaging plate to form an image on the photoimaging plate; and (d) transferring the image from the photoimaging plate to a print medium. Also disclosed here is an apparatus for carrying out the method, and a print medium printed using the method.