Abstract: In an example of the disclosure, an intermediate transfer member cleaning system includes an intermediate transfer member (“blanket”), an endless cleaning surface, and a pyrolysis station. The blanket is to receive a thermoplastic print agent from a photoconductive element. The endless cleaning surface can be positioned to rotatably engage with the blanket to transfer a residue of the thermoplastic print agent from the blanket to the endless cleaning surface. The endless cleaning surface can be moved away from the blanket to enter a pyrolysis station. The pyrolysis station is for receiving the endless cleaning surface, for heating the endless cleaning surface to convert the residue to ash, and for removing the ash.

Abstract: An example method comprises identifying, by a processor, a gap in a housing of a printing apparatus and positioning an inlet of a conduit inside the housing proximate the gap. The inlet is fluidly connected to a fan, and the fan is powered to create a pressure differential across the housing to minimize the amount of air inside the housing being able to escape the housing via the gap.

Abstract: A liquid electro-photographic printing system, comprising: a binary ink developer assembly, a power supply arrangement, a switching arrangement, and a controller. The binary ink developer assembly includes a plurality of members defining a flow path for a printing fluid containing charged particles, the plurality of members including a first member and a second member that are arranged to generate an electric field therebetween, the first member having a plurality of segments. The power supply arrangement continuously provides a supply of voltages during a print operation, the voltages including a first voltage and a second voltage having a different voltage level from that of the first voltage.

Abstract: Herein is disclosed a method for concentrating a liquid electrostatic ink composition, the method comprising replacing a first liquid carrier in a liquid electrostatic ink composition with a second liquid carrier, wherein the liquid electrostatic ink composition comprises chargeable toner particles dispersed in the first liquid carrier; and removing the second liquid carrier to produce a concentrated liquid electrostatic ink composition, wherein the second liquid carrier has a boiling point below 100° C. and wherein the second liquid carrier has a lower boiling point than the first liquid carrier. Also disclosed herein is a concentrated liquid electrostatic ink composition producible according to the method.

Abstract: In an example of the disclosure, carrier liquid is supplied to a container with a set of walls defined at least partially by a surface of an electrode. The carrier liquid is caused to move through a container via a carrier liquid flow path to sequentially encounter a set of accumulation elements. Each accumulation element is situated between adjacent walls. A voltage is applied to the electrode to generate an electric field between the electrode surface and the set of accumulation elements. The electric field causes contaminant from the carrier liquid to adhere to the set of accumulation elements.

Abstract: An example method comprises identifying, by a processor, a gap in a housing of a printing apparatus and positioning an inlet of a conduit inside the housing proximate the gap. The inlet is fluidly connected to a fan, and the fan is powered to create a pressure differential across the housing to minimize the amount of air inside the housing being able to escape the housing via the gap.

Abstract: A liquid electro-photographic printing system, comprising: a binary ink developer assembly, a power supply arrangement, a switching arrangement, and a controller. The binary ink developer assembly includes a plurality of members defining a flow path for a printing fluid containing charged particles, the plurality of members including a first member and a second member that are arranged to generate an electric field therebetween, the first member having a plurality of segments. The power supply arrangement continuously provides a supply of voltages during a print operation, the voltages including a first voltage and a second voltage having a different voltage level from that of the first voltage.

Abstract: An example cleaning station for a liquid electrophotographic printer is described. The cleaning station has a first cleaning member, a second cleaning member, and a biasing member. The cleaning station is configured to move between a first position and a second position with respect to a photo imaging member of the printer. In the first position, the first cleaning member is arranged to remove particles from the photo imaging member of the printer and the second cleaning member is arranged to apply a force to a layer of liquid applied to the photo imaging member. In the second position, the biasing member is configured to cause the second cleaning member to contact the first cleaning member to clean the second cleaning member.

Abstract: A print agent filtration apparatus is disclosed. The filtration apparatus is to remove non-liquid contaminant from liquid carrier. The apparatus comprises an electrode having a first surface, wherein the electrode is to generate an electric field towards liquid carrier containing non-liquid contaminant. The apparatus further comprises a second surface to accumulate non-liquid contaminant removed from the liquid carrier, the second surface being formed at least in part from a ceramic and movable relative to the first surface. A gap between the first surface and the second surface is substantially constant over the extent of the first surface. The first surface and the second surface define a passage therebetween through which the liquid carrier may pass. An electric field formed between the first surface and the second surface is to act on the liquid carrier, to thereby cause non-liquid contaminant to adhere to the second surface. A method and a print apparatus are also disclosed.

Abstract: An filtration apparatus is disclosed. The filtration apparatus is to remove non-liquid contaminant from liquid carrier. The filtration apparatus may include an electrode having a first surface, wherein the electrode is to generate an electric field towards liquid carrier containing non-liquid contaminant. The filtration apparatus may include a reservoir having a wall defined at least partially by the first surface, the reservoir to house a volume of liquid carrier. The filtration apparatus may include a plurality of plates, each plate having an accumulation surface, wherein a portion of each plate is within the reservoir, so as to be submerged in the volume of liquid carrier. An electric field formed between the first surface and the accumulation surface of each plate of the plurality of plates may act on the liquid carrier, to thereby cause non-liquid contaminant to adhere to an accumulation surface of a plate of the plurality of plates. A method and a print apparatus are also disclosed.

Abstract: An example cleaning station for a liquid electrophotographic printer is described. The cleaning station has a first cleaning member, a second cleaning member, and a biasing member. The cleaning station is configured to move between a first position and a second position with respect to a photo imaging member of the printer. In the first position, the first cleaning member is arranged to remove particles from the photo imaging member of the printer and the second cleaning member is arranged to apply a force to a layer of liquid applied to the photo imaging member. In the second position, the biasing member is configured to cause the second cleaning member to contact the first cleaning member to clean the second cleaning member.

Abstract: During a print cycle of a print apparatus, a liquid print agent including a carrier fluid is applied to a photoconductive surface. A proportion of the carrier fluid in the liquid print agent on the photoconductive surface is reduced at a first location by removably collecting a portion of the carrier fluid from the liquid print agent applied to the photoconductive surface. During a non-print cycle of the print apparatus, the removably collected portion of the carrier fluid is added to the photoconductive surface at the first location.

Abstract: In an example, charged particles suspended in a non-conductive fluid are fed to a transfer device. A width of a charged particles layer of uniform density on a surface of the transfer device is controlled. Charged particles are transferred from the charged particles layer to a photo imaging plate of a liquid electro-photographic printing system.

Abstract: In an example, a first wiper blade is to contact the photoconductive surface and to wipe at least some of particles and fluid from the photoconductive surface and wherein a second wiper blade is to contact the photoconductive surface and to wipe at least some of the particles and fluid that have passed the first wiper blade, from the photoconductive surface. The first wiper blade includes at least one perforation forming a passage through the wiper blade to transmit part of the particles and fluid during wiping.

Abstract: During a print cycle of a print apparatus, a liquid print agent including a carrier fluid is applied to a photoconductive surface. A proportion of the carrier fluid in the liquid print agent on the photoconductive surface is reduced at a first location by removably collecting a portion of the carrier fluid from the liquid print agent applied to the photoconductive surface. During a non-print cycle of the print apparatus, the removably collected portion of the carrier fluid is added to the photoconductive surface at the first location.

Abstract: An example cleaning station for a liquid electrophotographic printer is provided. The cleaning station has a sponge arranged to remove particles from a photo imaging plate of the printer, a fluid supply arranged to apply cleaning fluid to the sponge, a squeezing component arranged to squeeze the sponge in order to remove cleaning fluid and particles from the sponge, and a charging component arranged to electrically charge the squeezing component such that particles are attracted from the sponge to the squeezing component. The squeezing component is electrically isolated within the cleaning station.

Abstract: In an example, charged particles suspended in a non-conductive fluid are fed to a transfer device. A width of a charged particles layer of uniform density on a surface of the transfer device is controlled. Charged particles are transferred from the charged particles layer to a photo imaging plate of a liquid electro-photographic printing 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 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: In an example, a first wiper blade is to contact the photoconductive surface and to wipe at least some of particles and fluid from the photoconductive surface and wherein a second wiper blade is to contact the photoconductive surface and to wipe at least some of the particles and fluid that have passed the first wiper blade, from the photoconductive surface. The first wiper blade includes at least one perforation forming a passage through the wiper blade to transmit part of the particles and fluid during wiping.