Abstract: The present invention relates to an inkjet print head comprising an ink handling system comprising an ink entry port arranged to supply ink at a central position with reference to the length of the nozzle array, in particular at a position halfway the length of the nozzle array. The ink handling system further comprises two ink return ports, each arranged at each opposite end of the nozzle array for decentralized ink return. The ink handling system is configured such that in operation ink is circulated through the ink handling system such that the ink flows from the ink entry port to both ink return ports in opposite directions in heat exchanging contact with the droplet forming device. In another aspect, the invention relates to a printer comprising at least one print head according to the present invention.

Abstract: A liquid ejection device includes a liquid duct system having a plurality of nozzles, a plurality of pressure chambers communicating with the nozzles, and a liquid supply line communicating with the pressure chambers; a plurality of actuators arranged to pressurize the liquid in the pressure chambers for ejecting droplets of liquid through the nozzles; and a dampening device including a cavity that is in fluid communication with the duct system and is delimited by a resilient foil for dampening pressure waves in the liquid. The resilient foil is pre-formed in a corrugated shape.

Abstract: An inkjet print head includes an ink supply substrate having an ink supply channel in fluid communication with an ink supply connector channel for receiving ink from an ink reservoir and in fluid communication with an ink return connector channel for supplying ink to the ink reservoir; a droplet forming unit arranged on the ink supply substrate and having an ink inlet surface, in which ink inlet surface an ink inlet port for receiving ink from the ink supply substrate is arranged; a manifold chamber formed over the ink inlet surface of the droplet forming unit; and a filter arranged between the ink supply substrate and droplet forming unit. The filter has a first filter surface at an upstream side and a second filter surface at a downstream side. Filter holes extend from the first filter surface to the second filter surface. The first filter surface forms a wall of the ink supply channel.

Abstract: An inkjet print head for generating a droplet of ink includes an ink supply substrate having an ink supply channel; a droplet forming unit arranged on the ink supply substrate; and a manifold chamber formed over an ink inlet surface of the droplet forming unit. The manifold chamber has a first wall formed by the ink inlet surface, a second closed wall formed opposite to the first wall and a side wall extending between the first wall and the second wall and surrounding the manifold chamber. The manifold chamber extends in a manifold plane. A manifold supply channel is arranged in the manifold plane and surrounds the manifold chamber. The ink supply channel is in fluid communication with the manifold supply channel. A number of manifold feed openings in the side wall provide for a fluid connection between the manifold supply channel and the manifold chamber.

Abstract: An inkjet print head includes an ink supply substrate having an ink supply channel in fluid communication with an ink supply connector channel for receiving ink from an ink reservoir and in fluid communication with an ink return connector channel for supplying ink to the ink reservoir; a droplet forming unit arranged on the ink supply substrate and having an ink inlet surface, in which ink inlet surface an ink inlet port for receiving ink from the ink supply substrate is arranged; a manifold chamber formed over the ink inlet surface of the droplet forming unit; and a filter arranged between the ink supply substrate and droplet forming unit. The filter has a first filter surface at an upstream side and a second filter surface at a downstream side. Filter holes extend from the first filter surface to the second filter surface. The first filter surface forms a wall of the ink supply channel.

Abstract: An ink handling unit includes an ink reservoir with an integrated heat exchange channel configured for pre-heating or pre-cooling an ink feed flow entering the ink reservoir via the heat exchange channel. The heat exchange channel is in direct thermal contact with an interior space of the ink reservoir. An ink jet imaging device includes the ink handling unit. Such imaging devices are suitable to be used in highly productive ink jet processes at elevated temperatures.

Abstract: An inkjet print head for generating a droplet of ink includes an ink supply substrate having an ink supply channel; a droplet forming unit arranged on the ink supply substrate; and a manifold chamber formed over an ink inlet surface of the droplet forming unit. The manifold chamber has a first wall formed by the ink inlet surface, a second closed wall formed opposite to the first wall and a side wall extending between the first wall and the second wall and surrounding the manifold chamber. The manifold chamber extends in a manifold plane. A manifold supply channel is arranged in the manifold plane and surrounds the manifold chamber. The ink supply channel is in fluid communication with the manifold supply channel. A number of manifold feed openings in the side wall provide for a fluid connection between the manifold supply channel and the manifold chamber.

Abstract: An ink handling unit includes an ink reservoir with an integrated heat exchange channel configured for pre-heating or pre-cooling an ink feed flow entering the ink reservoir via the heat exchange channel. The heat exchange channel is in direct thermal contact with an interior space of the ink reservoir. An ink jet imaging device includes the ink handling unit. Such imaging devices are suitable to be used in highly productive ink jet processes at elevated temperatures.

Abstract: In an inkjet print head for generating a droplet of ink, the inkjet print head comprises an ink supply substrate, a droplet forming unit arranged on the ink supply substrate and an intermediate element arranged between the ink supply substrate and the droplet forming unit. The intermediate element has a first element surface on which the droplet forming unit is arranged and the intermediate element has a second element surface opposite to the first element surface. The intermediate element is supported on the ink supply substrate at the second element surface. The intermediate element is provided with a number of support protrusions at the second element surface. Due to the support protrusions, differences in coefficient of thermal expansion of the droplet forming unit and the ink supply substrate may reduce an effect of a resulting deformation of the droplet forming unit on an image quality.

Abstract: In an inkjet print head for generating a droplet of ink, the inkjet print head comprises an ink supply substrate, a droplet forming unit arranged on the ink supply substrate and an intermediate element arranged between the ink supply substrate and the droplet forming unit. The intermediate element has a first element surface on which the droplet forming unit is arranged and the intermediate element has a second element surface opposite to the first element surface. The intermediate element is supported on the ink supply substrate at the second element surface. The intermediate element is provided with a number of support protrusions at the second element surface. Due to the support protrusions, differences in coefficient of thermal expansion of the droplet forming unit and the ink supply substrate may reduce an effect of a resulting deformation of the droplet forming unit on an image quality.

Abstract: In an inkjet print head for generating a droplet of ink, the inkjet print head comprises an ink supply substrate; a droplet forming unit arranged on the ink supply substrate, the droplet forming unit having an ink inlet surface, in which ink inlet surface an ink inlet port for receiving ink from the ink supply substrate is arranged; a manifold chamber formed over the ink inlet surface of the droplet forming unit; and a filter arranged between the ink supply substrate and the manifold chamber, the filter having a first filter surface at an upstream side and having a second filter surface at a downstream side, the second filter surface being opposite to the first filter surface and filter holes extending from the first filter surface to the second filter surface. The filter is arranged in an area surrounding the manifold chamber for increasing the filter area without significantly increasing a cross-sectional size of the inkjet print head.

Abstract: A heat exchange unit and a printing system containing the heat exchange unit, including a heat exchange region, a first print media transport path configured for transporting in operation a first print medium from a supply through the heat exchange, the heat exchange unit further containing a stationary heat exchange member, having a first side facing said first print media transport path and a second opposite side facing said second print media transport path, wherein, in operation, the second print medium is at an elevated temperature with respect to the first print medium and wherein, the first and second print medium have a heat exchange contact in the heat exchange region.

Abstract: According to the present invention a sheet handling apparatus is provided which comprises a rotary drum with openings at its peripheral wall. A strip with perforations formed therein spirals circumferentially over an outer surface of the drum in a circumferential spiralling direction, such that a screen is formed over the drum. A suction system controls a flow of air through the perforations thereby to attract sheets towards the drum. The strip is biased by means of a tensioning assembly, which exerts a tensioning force on the strip substantially parallel to the circumferential spiralling direction of the strip.

Abstract: According to the present invention a sheet handling apparatus is provided which comprises a rotary drum with openings at its peripheral wall. A strip with perforations formed therein spirals circumferentially over an outer surface of the drum in a circumferential spiralling direction, such that a screen is formed over the drum. A suction system controls a flow of air through the perforations thereby to attract sheets towards the drum. The strip is biased by means of a tensioning assembly, which exerts a tensioning force on the strip substantially parallel to the circumferential spiralling direction of the strip.

Abstract: A recording substrate treatment apparatus includes a transporting mechanism for transporting a sheet of a recording substrate; a suction device to provide an underpressure force at an outer surface of the transporting mechanism arranged for holding down a sheet of a recording substrate; a heater for directly heating the recording substrate; and a blower for providing a flow of a gaseous medium at the outer surface of the transporting mechanism, wherein in operation the blower receives the gaseous medium from the suction device. The present invention also pertains to a printing system comprising such a recording substrate treatment apparatus and a method of drying a recording substrate using such a recording substrate recording apparatus.

Abstract: A recording substrate treatment apparatus, includes a heating device for directly heating a recording substrate, a condenser for condensing liquid from air from surroundings of a recording substrate, and an energy transfer system arranged for transferring energy from latent heat, which is released by the condensing of liquid by the condenser, to the heating device. Further, a method of drying a recording substrate and a method of fixing a printing substance on a recording substrate include heating a recording substrate by a heating device; condensing liquid from air from surroundings of the recording substrate; and transferring energy from latent heat, which is released by the condensing of liquid, to the heating device.

Abstract: A recording substrate treatment apparatus includes a transporting mechanism for transporting a sheet of a recording substrate; a suction device to provide an underpressure force at an outer surface of the transporting mechanism arranged for holding down a sheet of a recording substrate; a heater for directly heating the recording substrate; and a blower for providing a flow of a gaseous medium at the outer surface of the transporting mechanism, wherein in operation the blower receives the gaseous medium from the suction device. The present invention also pertains to a printing system comprising such a recording substrate treatment apparatus and a method of drying a recording substrate using such a recording substrate recording apparatus.

Abstract: In a method for fusing a recording material on a medium, a fusing element is radiated close to and upstream from a fuse nip. Thus, the heat that is provided has very little time to penetrate the fusing element and thus remains at a surface of the fusing element. Therefore, the fusing element does not need to be heated thoroughly, which would require a substantial amount of time. Consequently, in the method, heat may be provided on demand and an energy efficient fuse method is thus provided.

Abstract: In a method for fusing a recording material on a medium, a fusing element is radiated close to and upstream from a fuse nip. Thus, the heat that is provided has very little time to penetrate the fusing element and thus remains at a surface of the fusing element. Therefore, the fusing element does not need to be heated thoroughly, which would require a substantial amount of time. Consequently, in the method, heat may be provided on demand and an energy efficient fuse method is thus provided.

Abstract: An ink jet printhead which includes a line of nozzles arranged with a uniform first pitch in a line direction X, a plurality of parallel ink channels having an axial direction normal to said line direction X and arranged in groups within which they have a uniform second pitch, each ink channel being connected to one of said nozzles, and a plurality of actuators arranged in groups corresponding to those of the ink channels, each actuator being associated with one of the ink channels for pressurizing ink contained therein for expelling an ink droplet through the associated nozzle, wherein the ink channels are connected to their associated nozzles by flow passages which all have a substantially equal length and are inclined relative to said axial direction with varying angles in both, said line direction X and a scan direction Z being orthogonal to the line direction and the axial direction.