Abstract: A digital printing apparatus comprising a developing roller (102) and an image carrying roller (101); the developing roller (102) being arranged to transfer liquid toner (107) onto the image carrying roller (101) in accordance with a charge pattern; an upstream charger (111) upstream of an area (108) of rotational contact between the developing roller (102) and the image carrying roller (101); a downstream discharger (112, 122, 132) downstream of the area (108); a sensor (200) downstream of the area (108) to detect a property representative of the charge of a liquid toner residue; and a controller (210) to receive sensor data from the sensor (200) and to provide a control signal to control the downstream discharger.

Abstract: The liquid toner dispersion comprises marking particles to which dispersing agent is bound for dispersing the marking particles in a substantially non-polar carrier liquid. The dispersing agent is of a hyper-dispersant type comprising an anchor group for binding to a marking particle and stabilizing groups coupled to the anchor group for stabilizing said marking particle in the carrier liquid. The dispersion further comprises a spacer agent that comprises a polar head group and a substantially non-polar tail, and that acts as a spacer of the marking particles.

Abstract: A liquid toner dispersion provided with marking particles comprising a pigment and a polyester based resin, the dispersion comprising a nonpolar organic carrier liquid and a hyperdispersant comprising a graft copolymer provided with an anchor group comprising an amine-functionalized polymer onto which at least one stabilizing group is grafted, wherein a first stabilizing group and a second stabilizing group are coupled to the anchor group, wherein the first stabilizing group is a polyolefin and the second stabilizing group is hydroxylated fatty acid compound.

Abstract: A liquid toner dispersion provided with marking particles comprising a pigment and a polyester based resin. The dispersion includes a nonpolar organic solvent and a hyperdispersant including a graft copolymer provided with an anchor group including an amine-functionalised polymer onto which at least one stabilising group is grafted. The stabilising group includes a hydroxylated fatty acid oligomer. The amine-functionalised polymer has a weight-average molecular weight of less than 1000 g/mol.

Abstract: A method for the reduction of caking of excess liquid developer dispersion that remains present on the surface of a member after transfer of liquid developer dispersion from one member to another member in a digital printing apparatus, comprising the step of adding a dispersing composition to the excess liquid developer dispersion, wherein the dispersing composition comprises a dispersing agent.

Abstract: A digital printing apparatus comprising a developing roller (102) and an image carrying roller (101); the developing roller (102) being arranged to transfer liquid toner (107) onto the image carrying roller (101) in accordance with a charge pattern; an upstream charger (111) upstream of an area (108) of rotational contact between the developing roller (102) and the image carrying roller (101); a downstream discharger (112, 122, 132) downstream of the area (108); a sensor (200) downstream of the area (108) to detect a property representative of the charge of a liquid toner residue; and a controller (210) to receive sensor data from the sensor (200) and to provide a control signal to control the downstream discharger.

Abstract: Disclosed is an image application unit for use with liquid toner, suitable for transferring an image to a drum rotating around a vertical axis or a printing substrate guided by such a drum. The image application unit includes: a liquid toner dosing assembly; an imaging member sustaining a pattern of electric charge forming a latent image on its surface, and arranged to transfer it after development to said drum or said substrate; and a development member arranged to receive liquid toner from the dosing assembly, and to develop the latent image by transferring a portion of the liquid toner onto the imaging member in accordance with the pattern. The liquid toner dosing assembly is adapted for vertical use and the development member and the imaging member are configured for rotation around vertical axes.

Abstract: This invention is related to a liquid developer dispersion for use in a digital printing apparatus comprising a non volatile carrier liquid, a marking particle and a dispersing compounds, wherein the marking particle in the liquid developer dispersion is stabilized during storage and wherein at fusing two phases are formed. The invention is also related to the use of the developer in a digital printing apparatus and to a method for preparing the liquid developer dispersion.

Abstract: A digital printing apparatus using liquid toner comprising chargeable imaging particles and carrier liquid, comprising an imaging member (140) to sustain a pattern of electric charge forming a latent image on its surface, a development member (130) to receive toner (100) from a reservoir (110), and to develop the image by transferring toner onto the imaging member (140) in accordance with the pattern, leaving a remaining fraction of the toner on the development member (130), an electrical field generating means to compact the particles by applying a field before transfer onto the imaging member (140), means (150, 160) for depositing the toner onto a substrate (199), and means (133) for removing remaining toner from the development member (130), comprising an integrated source for generating an oscillating electric field, arranged to decompactify the chargeable imaging particles and mechanical removal means for removing the liquid toner.