Abstract: An apparatus for aligning dipoles is provided. The apparatus includes: an electric field forming unit including a stage and a probe unit, the probe unit being configured to form an electric field on the stage; an inkjet printing device including an inkjet head, the inkjet head being configured to spray ink including a solvent and dipoles dispersed in the solvent onto the stage; a light irradiation device configured to irradiate light onto the stage; and a temperature control device including a temperature control unit, the temperature control unit being configured to control a temperature of the solvent sprayed on the stage.

Abstract: Provided is an ink treatment solution set including: an ink composition that is water-based ink jet ink containing a coloring material; and a treatment solution that contains a coagulant, is ejected from an ink jet head, and is used for recording, in which any one of the ink composition and the treatment solution has a dynamic surface tension of greater than 32.0 mN/m and less than 36.0 mN/m at 10 ms and has a difference of equal to or greater than 6.0 mN/m and equal to or less than 10.0 mN/m between the dynamic surface tension at 10 ms and a dynamic surface tension at 1000 ms, an other one of the ink composition and the treatment solution has a dynamic surface tension of greater than 34.5 mN/m and less than 36.5 mN/m at 10 ms and has a difference of equal to or greater than 8.0 mN/m and equal to or less than 10.0 mN/m between the dynamic surface tension at 10 ms and a dynamic surface tension at 1000 ms, and the ink treatment solution set is used for recording on a poorly absorbable recording medium.

Abstract: Methods for introducing exogenous material into a cell are provided, which include exposing the cell to a transient decrease in pressure in the presence of the exogenous material. Also provided are devices for performing the method of the invention.

Abstract: A method of controlling a hand-operated printer (3) includes detecting a transverse movement of the hand-operated printer (3) after finishing a first swath (1). The method compares a transverse distance covered by the transverse movement with a predetermined transverse distance (11) between said first swath (1) and a second swath (2). A transverse-stop signal is emitted when the transverse distance covered by the transverse movement reaches the predetermined transverse distance (11).

Abstract: A continuous inkjet printer (10, 100) has an ink drop generator (12, 112a, 112b) to generate a stream of ink drops (24), deflection means (14, 16, 18, 20, 114, 115, 116, 118a, 118b, 120) to direct each drop of the stream of ink drops either to a gutter (28) or to one of a plurality of default print positions in a stroke direction (30) on a substrate (26, 126), and input means (22, 122) to receive an indication of an offset. The deflection means, in dependence upon the indication of the offset, direct drops that would otherwise be directed to default print positions to offset print positions on a substrate (26, 126), the offset print positions being displaced in the stroke direction 30 by the offset from the default print positions.

Abstract: Individual aqueous inks or inks in ink sets haves a non-crosslinked, crosslinkable polyurethane having an acid number of 20-40 and is derived from an aromatic diisocyanate; and a diol mixture of D1 and D2 diols, and optionally including D3 diol, D4 diol, or both D3 and D4 diols. D1 has a C3 to C7 aliphatic group and a pendant carboxy group or neutralized carboxy group. D2 has a chain of repeating C2 to C6 alkylene oxide groups. D3 is an alkoxylated bisphenol A or an aliphatic cyclic diol, present at least 5 mol %. D4 is a hydroxy-terminated polybutadiene having a molecular weight of at least 1000 and is present in an amount of 0.1-5 mol %. The ink also contains a dispersed pigment colorant; a humectant or organic co-solvent, and optionally, a crosslinking agent.

Abstract: A liquid jetting head includes: a channel substrate having a nozzle surface in which nozzles are open, the channel substrate being formed with pressure chambers communicating with the nozzles respectively; and an actuator covering the pressure chambers. The pressure chambers include first pressure chambers arranged in an arrangement direction to form a first pressure chamber row. The nozzles include first nozzles communicating with the pressure chambers respectively. Any two first nozzles that are adjacent in the arrangement direction are arranged at different positions in the channel substrate with respect to an orthogonal direction which is parallel to the nozzle surface and orthogonal to the arrangement direction and different in a first distance. The first distance is a distance in the orthogonal direction between each first nozzle and an end on one side in the orthogonal direction of the first pressure chamber communicating with the first nozzle.

Abstract: A device for forming and ejecting drops of an ink jet of a CIJ printing machine, this device including: a cavity for containing an ink and including an end provided with a nozzle (10) for ejecting ink drops, actuator means (21, 22, 32, 41, 42), in contact with the cavity, in which device the jet velocity modulation, from the nozzle (10), has a value ?Vj(ft) at the operating frequency of the cavity and the actuator, and this jet velocity modulation, at the temperature of 15° C. and at the temperature of 35° C., does not vary, in a frequency range of ±5 kHz about the operating frequency ft, outside the range of between 0.25 ?Vj(ft) and 4 ?Vj(ft).

Abstract: This disclosure relates to an ink composition (e.g., a hot melt ink composition or a radiation curable ink composition) that has a relatively low conductivity. This disclosure also relates to a continuous printing process using such a composition and a product containing such a composition.

Abstract: A device is disclosed herein which may comprise a droplet generator producing droplets of target material; a sensor providing an intercept time signal when a droplet reaches a preselected location; a delay circuit coupled with said sensor, the delay circuit generating a trigger signal delayed from the intercept time signal; a laser source responsive to a trigger signal to produce a laser pulse; and a system controlling said delay circuit to provide a trigger signal delayed from the intercept time by a first delay time to generate a light pulse that is focused on a droplet and a trigger signal delayed from the intercept time by a second delay time to generate a light pulse which is not focused on a droplet.

Abstract: An ink supply apparatus includes an ink filling port, an ink storage section, an ink flow path, a displacement section, an ink supply port, and a sealing structure. The ink storage section is communicated with the ink filling port to store the ink. The ink flow path is communicated with the ink storage section. The displacement section defines a portion of the ink flow path, and configured and arranged to be displaced according to internal pressure in the ink flow path so as to be detected by the printer. The ink supply port is communicated with the ink flow path to supply the ink from the ink flow path to the printer. The sealing structure seals an inner section of the ink flow path at least in a low ink remaining amount state where a remaining amount of the ink is a predetermined amount or less.

Abstract: A material deposition system includes a frame, a support coupled to the frame to support an electronic substrate during a deposit operation, a gantry coupled to the frame, and a deposition head coupled to the gantry. The deposition head is movable over the support by movement of the gantry. The deposition head includes a chamber to hold material, an actuator to push a volume of material out of the chamber, a needle extending from the chamber and terminating in a needle orifice, and at least two air jets located on opposite sides of the needle orifice. A desired volume of material is formed at the needle orifice in response to the actuator, and each of the at least two air jets produce a timed pulse of air to create a micro-droplet from the desired volume and to accelerate the micro-droplet to high velocity.

Abstract: The invention provides a device and a method for flow cytometric fractionation of particles contained in a fluid stream, wherein sections of the fluid stream, especially droplets if the fluid stream is a droplet stream, are irradiated with a laser. The laser disposed for the irradiation of the sections of the fluid stream can have a wavelength which is absorbed by the fluid and can have a sufficient radiation duration and radiation intensity to deflect sections of the fluid stream.

Abstract: The invention relates to a new control method for controlling the printing of a binary continuous inkjet printer provided with a printhead (20) with a set of deflection electrodes (8a, 8b; 9a, 9b) shared by all of the nozzles of the head, at least one pair of electrodes (8, 9) supplied in phase opposition relative to each other, and actuators (6) to which pulses are sent to form a distance Lbr from the plane of the nozzles (11), from the break of a jet discharged by a nozzle (3) in communication with a stimulation chamber (2) to which said actuator is mechanically coupled, drops not able to be electrically charged or jet segment subjected to the electrostatic influence of the deflection electrodes. According to the invention, the pulses are controlled so as to minimize the total electrical charge taken on by the ink jet segments inside a volume of influence of the electrodes.

Abstract: Ink jet printers, ink stream modulators, and methods to generate droplets from an ink stream are disclosed. An example method to generate droplets from an ink stream includes generating a stream of ink with an inkjet nozzle and modulating the stream of ink into a plurality of droplets by generating an alternating electrical field having a frequency based on a permittivity of the ink to cause a dielectrophoretic effect.

Abstract: A method of printing an image with a continuous inkjet printer system employing a jetting module including a nozzle in fluid communication with a liquid ink source and a catcher including a liquid drop contact face; wherein the liquid ink is an aqueous inkjet black ink comprising a black colorant and at least one surfactant selected to provide a 10-ms dynamic surface tension of less than 54 mN/m. Full color images may be printed by further employing at least second, third and fourth jetting modules and yellow, magenta and cyan inks each also comprising a surfactant selected to provide a 10-ms dynamic surface tension of less than 54 mN/m for each ink. The ink compositions provide for fluid properties on the drop catcher face that minimize printing defects that can occur during drop deflection during the printing of high dynamic range images at high speed.

Abstract: A material deposition system includes a frame, a support coupled to the frame to support an electronic substrate during a deposit operation, a gantry coupled to the frame, and a deposition head coupled to the gantry. The deposition head is movable over the support by movement of the gantry. The deposition head includes a chamber to hold material, an actuator to push a volume of material out of the chamber, a needle extending from the chamber and terminating in a needle orifice, and at least two air jets located on opposite sides of the needle orifice. A desired volume of material is formed at the needle orifice in response to the actuator, and each of the at least two air jets produce a timed pulse of air to create a micro-droplet from the desired volume and to accelerate the micro-droplet to high velocity.

Abstract: A method of printing an image with a continuous inkjet printer system employing bimodal drop size generation with pigmented inkjet ink compositions comprising a polymer additive, wherein the liquid ink is an aqueous inkjet ink comprises dispersed pigment colorant particles having a mean particle size of less than 150 nanometers and at least about 0.1 wt % of polymer additive distinct from any polymer dispersant used to disperse the pigment particles, and recirculating liquid ink supplied to the nozzle if the printer system from a liquid ink source is in-line filtered with a filter selected to be effective at retaining particles having particle sizes equal to and greater than 0.6 micrometers from the liquid ink and to pass the dispersed pigment particles. The invention enables high quality drop control in a continuous inkjet printing system.

Abstract: An ink jet recording apparatus and printing control method are provided in which when a moving speed of a printing object is changed, a difference in writing start position is reduced and printing quality is improved. The apparatus includes an ink container, a nozzle connected to the container for ejecting ink, a charging electrode to charge the ejected ink, a deflecting electrode to deflect the charged ink, a gutter to collect ink not used for printing, a writing start timing control circuit to generate a first line clock signal, a printing width control circuit to generate a second line clock signal, and a control part. The control part controls print start timing based on the first clock signal, and when the printing object reaches the printing start timing, the control part performs a width adjustment of a character string of printing content based on the second clock signal.

Abstract: Liquid dispensing includes providing a downwardly inclined slide surface and a carrier liquid dispensing channel that includes an outlet opening on the slide surface. A carrier liquid source is pressurized causing carrier liquid to flow continuously through the outlet opening of the carrier liquid dispensing channel and down the slide surface. A liquid dispenser array structure is provided and includes functional liquid dispensers located on a substrate that is common to the functional liquid dispensers. The functional liquid dispensers include a functional liquid supply channel, a functional liquid source that provides functional liquid, and a drop formation device associated with an interface of the functional liquid supply channel and the slide surface. The drop formation device is selectively actuated to form discrete functional liquid drops in the carrier liquid flowing down the slide surface. The functional liquid is immiscible in the carrier liquid.

Abstract: A liquid-jet recording apparatus includes a liquid-jet recording head unit to jet ink droplets toward a recording medium for printing and including an opening area through which the ink droplets fly out from the liquid-jet recording head unit, and a conveyance unit to convey the recording medium to a fore side of the opening area. The liquid-jet recording head unit includes a multi-nozzle inkjet head, a separation unit, a gas-flow application unit, and a gutter unit. The multi-nozzle inkjet head includes multiple inkjet nozzles, pressurizes ink, and emits a plurality of continuous streams of an ink. The opening area has a slit shape extending along a direction in which the multiple inkjet nozzles are arrayed. An air flow generated in the opening area has a velocity vector directed inward from the opening area.

Abstract: A voltage is applied between first and second deflecting electrodes from a deflecting voltage controller, whereby an electric field is formed between the first and second deflecting electrodes in a direction perpendicular to electrode surfaces. An electric line of force is generated from a direction perpendicular to the electrode surface of the first deflecting electrode and made perpendicularly incident on the electrode surface of the second deflecting electrode. Since the first and second deflecting electrodes are parallel to each other, a plurality of parallel electric lines of force are formed perpendicularly to the electrode surfaces of the first and second deflecting electrodes. Droplets after passing charged electrodes fly in a region where this deflecting electric field is formed, whereby charged droplets are deflected in a direction in which the charged droplets approach the second electrode having opposite charging polarity. The charged droplets form a printing pattern.

Abstract: Aqueous ink jet ink compositions can be used for ink jet printing colored or invisible images on receiver elements. These compositions contain a polymeric agent comprising core-shell polymeric particles. The core of the particles comprises a hydrophobic polymer having an acid number less than 10. The shell of the particles comprises a hydrophilic polymer having an acid number of at least 70. The weight ratio of the core to the shell is at least 50:50 and up to and including 90:10. Such compositions can be used in various ink jet printing systems including drop on demand and continuous ink jet printing systems.

Abstract: An inkjet receiving media comprising a substrate having a transparent topmost layer coated thereon at solid content of from 0.3 to 2.5 g/m2, wherein the topmost layer includes from 30-70 wt % of one or more aqueous soluble salts of multivalent metal cations, 5 to 20 wt % of a cross-linked hydrophilic polymer binder, 4 to 12 wt % of a cationic polymer to stabilize 10 to 40 wt % silica that is less than 200 nm is size. Improved optical density, reduced mottle and improved wet abrasion resistance are provided when the receiver is printed with an aqueous pigment-based ink. In further embodiments, the topmost layer can further include high levels of silica that makes the layer porous.

Abstract: A continuous inkjet method includes modulating a liquid jet having a wavelength ?, and causing first and second droplets to break off from the liquid jet and travel along a path. The second droplet has a break off length that is longer than the break off length of the first droplet. The first and second break off lengths have a difference of at least one wavelength ? in response to stimulation pulses. A charge differential is produced between the first and second droplets. The trajectories of the first and second droplets are caused to diverge so that one of the first and second droplets is collected and the other of the first and second droplets is deposited on a surface. A transition in droplet creation is identified between stimulation cycles that produce the first and second droplets. A skip cycle is introduced between the stimulation cycles.

Abstract: An ink-jet recording apparatus has a print head 13 incorporating: a nozzle 20, which vibrates ink at a constant cycle, jets out the ink, and atomizes the ink; an electrification electrode 26, which electrify an ink particle 19; and deflection electrodes 27b, which deflect the electrified ink particle in a main scanning direction. The print head 13 carries out printing by causing the ink particle to fly to a printing workpiece W conveyed by a conveyer 15. Flying time of the ink particle in a printing distance La between the printing workpiece W and the print head 13 is calculated, timing of an electrification signal supplied to the electrification electrode 26 is controlled in accordance with the flying time, and a printing position to the printing workpiece W is set. Thus, printing can be carried out at a predetermined position to the printing workpiece W, and printing quality can be enhanced.

Abstract: A method of printing includes selectively loading a memory element during a printing operation with data that modifies a subsequent actuation of jet control elements to form or steer or form and steer print drops that print pixels on a receiver in a second regularly spaced pixel grid, the second regularly spaced pixel grid having a second spatial density of pixels extending in a direction perpendicular to a travel path of the receiver that is different when compared to a first spatial density of a first regularly spaced pixel grid, printing pixels on the receiver in the second regularly spaced pixel grid, and catching drops that are formed but not used to print pixels on the receiver in the first regularly spaced pixel grid or used to print pixels on the receiver in the second regularly spaced pixel grid.

Abstract: A method of producing a print on a recording medium includes receiving positive and negative image data for the print to be produced. A selected region of the recording medium is discharged. First-sign charged fluid is deposited in a selected first-sign charged-fluid pattern on the selected region of the recording medium, the first-sign charged-fluid pattern corresponding to the positive image data. Second-sign charged fluid is deposited in a selected second-sign charged-fluid pattern on the selected region of the recording medium, the second-sign charged-fluid pattern corresponding to the negative image data and the second sign being different from the first sign. Charged dry ink having charge of the second sign is deposited onto the recording medium. The deposited dry ink is attracted to the first-sign charged-fluid pattern and adheres to the recording medium in the first-sign charged-fluid pattern.

Abstract: A continuous printer system includes a jet control element, associated with each nozzle bore of an array of nozzle bores, which is selectively actuated to form or steer or form and steer print drops from a liquid stream emitted from the associated nozzle bore. A memory element associated with the inkjet printer is selectively loaded during a printing operation with data that modifies the subsequent actuation of each of the jet control elements to form or steer or form and steer print drops that print pixels on a receiver in a second regularly spaced pixel grid, the second regularly spaced pixel grid having a second spatial density of pixels extending in a direction perpendicular to a travel path of the receiver that is different when compared to a first spatial density of a first regularly spaced pixel grid.

Abstract: A printhead includes a nozzle and a jet control element. The jet control element includes a continuous heater element positioned to surround the nozzle and a plurality of three or more electrical contacts in electrical communication with the continuous heater element. The plurality of three or more electrical contacts define a plurality of three or more continuous heater element portions that are actuatable with sufficient independence so as to control jet steering. The number of the continuous heater element portions equals the number of electrical contacts.

Abstract: A continuous inkjet system and method has a stimulation device producing a modulation in a liquid jet having a wavelength ? and causing a first liquid droplet to break off from the liquid jet and travel along a path and causing a second liquid droplet to break off from the liquid jet and travel along the path. The first liquid droplet has a first break off length and the second liquid droplet has a second break off length longer than the first break off length. The first break off length and the second break off length have a difference of at least one wavelength ? in response to stimulation pulses.

Abstract: A continuous liquid ejector includes a structure including a wall. A portion of the wall defines a nozzle having a first fluidic resistance R1. A first liquid feed channel is in fluid communication with the nozzle. The first liquid feed channel has a second fluidic resistance R2. A first drop forming mechanism is associated with the first liquid feed channel. A second liquid feed channel is in fluid communication with the nozzle. The second liquid feed channel has a third fluidic resistance R3. The first fluidic resistance R1 is less than the second fluidic resistance R2 plus the third fluid resistance R3 (R1<(R2+R3)). A second drop forming mechanism associated with the second liquid feed channel.

Abstract: A liquid stream is caused to jet from a nozzle. A small or large drop waveform applied to a drop forming mechanism causes the liquid stream to break up into a small or large volume drop, respectively. The small drop waveform includes a pulse having a pulse energy Es, and a period XS, where XS?1/fR, and where fR is the Rayleigh frequency of the liquid. The large drop waveform has a period XL, where XL=NXS, with the large volume drop being N times the small volume drop. The large drop waveform includes a first pulse having a pulse energy EL1, where EL1?ES and a second pulse occurring within a time period X2, where X2?XS, of an initial pulse of a subsequent small or large drop waveform, the second pulse including a pulse energy EL2, where EL2<ES.

Abstract: Apparatus, articles of manufacture, and image forming apparatus for capturing aerosols are disclosed. An example apparatus includes a corona wire, and an excitation source to provide to the corona wire a composite signal having a direct current component and an alternating current component, the alternating current component having a cycle, a first portion of the cycle being sufficient to cause the composite signal to exceed an inception voltage at which ions are generated by the corona wire and a second portion to cause the composite signal to fall beneath the inception voltage, the excitation source to avoid causing the corona wire to substantially charge a substrate.

Abstract: The present subject matter relates to a method and system for pulsed air-actuated micro-droplet on demand jetting, especially for jetting high viscosity liquids. A needle extends from a liquid chamber and terminates in a drop-forming orifice outlet from which micro-droplets are generated. At least two air jets direct a timed pulse of air at the drop-forming orifice outlet of the needle. The pulsed air is synchronized with the formation of a desired volume of liquid at the orifice outlet to extract and propel a micro-droplet at high velocity to a substrate. The air jets are turned on prior to the forming of the desired volume at the orifice outlet of the needle, and turned off after the micro-droplet had been produced.

Abstract: A method and device for periodically perturbing the flow field within a microfluidic device to provide regular droplet formation at high speed.

Abstract: A continuous ink jet printer has a line (69a) for venting at least some of the air that has been sucked along the gutter line (17), and a line (69b) for recirculating back to the printhead (25) at least some of the air that has been sucked down the gutter line (17). Preferably the relative proportions of vented air and recirculated air can be varied, so as to reduce solvent loss during normal operation but allow increased solvent loss if the ink is over-dilute. Preferably the air recirculated to the printhead is connected directly into the flow path from the gutter orifice to the source of gutter suction, without opening into the space containing the ink jet. This reduces the tendency of solvent in the recirculated air condense on the printhead electrodes.

Abstract: A liquid stream is caused to jet from a nozzle. A small or large drop waveform applied to a drop forming mechanism causes the liquid stream to break up into a small or large volume drop, respectively. The small drop waveform includes a pulse having a width wS, and a period x, where x?1/fR, where fR is the Rayleigh frequency of the liquid. The large drop waveform includes a period Nx, with the large volume drop being N times the small volume drop. The large drop waveform includes a first pulse having a pulse width wL1, where wL1?wS, and a second pulse occurring within a period of (fR/fC)x of an initial pulse of a subsequent small or large drop waveform, where fC is the cut off frequency of the liquid. The second pulse includes a pulse width wL2, where wL2<wS.

Abstract: Various particle transport systems and components for use in such systems are described. The systems utilize one or more traveling wave grids to selectively transport, distribute, separate, or mix different populations of particles. Numerous systems configured for use in two dimensional and three dimensional particle transport are described.

Abstract: Disclosed are a method for forming a metal oxide pattern and a method of manufacturing a thin film transistor using the patterned metal oxide. The method for forming a metal oxide pattern includes: preparing an ink composition including at least one metal oxide precursor or metal oxide nanoparticle, and a solvent; ejecting the ink composition on a substrate to form a pattern on the substrate; and photosintering the formed pattern. Herein, the metal oxide precursor is ionic.

Abstract: A method of cleaning a print head assembly comprising a print head and a cover includes removing the cover from the print head assembly. A cleaning unit includes a fluid chamber, a fluid intake port, and a fluid exit port. The cleaning unit is attached to the print head such that the fluid chamber surrounds a portion of the print head. A solvent is introduced into the fluid chamber to contact the print head. The solvent is allowed to clean the print head. The solvent is removed from the chamber.

Abstract: A microfluidic device comprising a monolithic superstructure, wherein the superstructure contains fluid channels, and in at least one of the fluid channels, in an area where the channel changes direction or intersects another channel, the channel is greater in cross-section than in other areas of said channel. A microfluidic device superstructure comprising fluid channels wherein said channels comprise projections into at least part of the channel to aid in laminar flow of fluid.

Abstract: The present invention provides methods of generating scalable patterned features on a substrate. The methods includes ejecting a succession of droplets; applying a force to the droplets in a manner such that the droplets travel along a designated path; altering the properties of one or more of the droplets in a manner so as to adjust the size of the droplets; and depositing the droplets on the substrate to generate patterned features on the substrate. The present invention also provides apparatuses for generating scalable patterned features on a substrate.

Abstract: A configuration of an image display apparatus which can reduce a pump exclusive for solvent is provided. The image display apparatus of the present invention is provided with an ink chamber in an ink supply path from an ink container to a printhead and a solvent chamber in a solvent supply path from a solvent container to the printhead. The ink chamber and the solvent chamber are formed by dividing a liquid chamber by an elastic member (diaphragm), and volumes (capacities) of the ink chamber and the solvent chamber are changed by a pressure of the ink.

Abstract: Inkjet printing systems are provided. One inkjet printing system has a plurality of inkjet printheads, each having nozzles for jetting ink droplets having a vaporizable carrier fluid, a support structure to which the plurality of inkjet printheads are mounted, such that a face of each of the printheads of the plurality of printheads is positioned to jet the ink droplets toward a target area through which a receiver transport system moves a receiver during printing; and a shield between the support structure and the target area creating a first region between the shield and the target area with the shield having at least one opening through the shield through which the nozzles of the printhead can jet the ink droplets to the target area. An energy source supplies energy to cause the temperature of the shield to rise above a condensation temperature of vaporized carrier fluid in the second region.

Abstract: A manifold assembly has been constructed that filters ink before the ink enters an inkjet ejector in an inkjet print head. The manifold assembly includes an adhesive layer having openings, an ink manifold layer having a plurality of openings, the openings in the adhesive layer being aligned with the openings in the ink manifold layer, and a polymer layer having a plurality of filter areas, the filter areas being aligned with the openings in the ink manifold layer and the openings in the adhesive layer, the adhesive layer being interposed between the polymer layer and the ink manifold layer.

Abstract: An ink jet ink composition includes an organic solvent, a binder, and a colorant. The colorant is selected from at least a first pigment and a second pigment. If the ink composition comprises carbon black, the carbon black is present in an amount less than 30% by weight of the total pigment content.

Abstract: A continuous ink-jet printer or a print head of such a printer which includes electrical means for compensating for mechanical crosstalk between adjacent stimulation chambers, where these means simultaneously with the transmission, to a stimulated chamber, of a stimulation pulse on a stimulation line send a pulse for compensating for mechanical crosstalk on each of the lines supplying an actuator for the chamber adjacent to the stimulated chamber. Specific ratios between the peak amplitude of pulse for compensating for crosstalk and the peak voltage value of the stimulation pulse are provided as a function of the gaps between consecutive nozzles.

Abstract: A method and device for passively periodically perturbing the flow field within a microfluidic device to cause regular droplet formation at high speed.

Abstract: The invention relates to an apparatus for ejecting droplets of a fluid material, comprising: a reservoir for storing the material, a channel connected with the reservoir, which is provided with at least one outflow opening from which, in use, flows a jet of the material breaking up into droplets, a pump for pressurizing the fluid material in the reservoir, so as to pass the material under pressure through the channel in the direction of the outflow opening, and a movable member provided in the reservoir, the member formed by a plurality of surfaces shaped to induce a pressure variation in the fluid material upstream of the outflow opening, for the purpose of obtaining the jet breaking up into droplets; the movable member mounted to have each opposed surface receiving identical hydrostatic pressure, to generate a net resulting zero force exerted on the movable member by the hydrostatic pressure. Accordingly, a simple mechanism is provided for providing multiple printing nozzles.