Abstract: A water-based ink for inkjet recording is provided with color material, binder resin, surfactant, and water-based solvent, wherein when the ink is heated, 1) a viscosity of the ink is more than 10 mPa·s and 30 mPa·s or less, the viscosity being measured over the ink weight change rate range of 0% to 10%; 2) a viscosity of the ink is 200 mPa·s at any one of the ink weight change rate within 35% or more and 55% or less, the viscosity being measured by the E-type viscometer at 25° C. and 1 rpm; and 3) a surface tension at 25° C. of the ink at the ink weight change rate of 5% is lower than a surface tension at 25° C. of the ink at the ink weight change rate of 0%.

Abstract: A drive signal generating unit that generates a drive signal applying, in one pixel period, at least one drive waveform for causing ink droplets to be discharged can generate two types of drive waveforms, a large droplet waveform and a small droplet waveform. The large droplet waveform includes an expansion pulse expanding the volumes of pressure chambers and a contraction pulse making the volumes of the pressure chambers contract. The expansion pulse width of the large droplet waveform is 2.8 AL or longer but 3.4 AL or shorter. The small droplet waveform includes an expansion pulse, a pause period, and a contraction pulse, and the expansion pulse width of the small droplet waveform is 0.8 AL or longer but 1.2 AL or shorter, where AL represents a half of an acoustic resonance period of a pressure wave in the pressure chamber.

Abstract: A driving waveform has a first driving waveform (PLSTM1) composed of non-GND waveform, a second driving waveform (PLSTM2) composed of a non-GND waveform different from the first driving waveform, and a third driving waveform (PLSTM0) composed of a GND waveform, and a driving voltage V1 of the first driving waveform and a driving voltage V2 of the second driving waveform is |V1|>|V2|; and the driving circuit selects at least the first driving waveform and the second driving waveform or only the first driving waveform at every predetermined time in 1 pixel cycle in accordance with the discharge data, applies this to one of the two driving electrodes of the pressure generating unit and also applies only the second driving waveform to the other so as to operate the pressure generating unit by a differential waveform between the two driving electrodes.

Abstract: Disclosed is an inkjet ink which provides a high-quality image in that whitening of the recorded image film is inhibited, durability of the image is good, and there is no banding, and the like; inkjet injection stability and ink shelf life are excellent; and head maintenance returnability is excellent. Also disclosed are a method for producing an inkjet printed product using the same, and a method for producing a water-based inkjet ink. This inkjet ink comprises at least a) a pigment, b) a polymer dispersant comprising polyethylene oxide groups having an acid value of less than 50 mgKOH/g (c) acrylic copolymer resin, and (d) at least one water-soluble organic solvent selected from glycol ethers and 1,2-alkanediols having 4 or more carbons.

Abstract: In an ink jet ink containing a pigment, a binder resin, water, an organic solvent, and a surfactant, the surface tension of the ink is in a region defined by ?0??x?1.0 (?0: surface tension before evaporation, ?x: surface tension at an evaporation rate X %) when the evaporation rate X of the ink is in a range of 0<X(%)?20; the ink jet ink contains two or more organic solvents; and the content of an organic solvent of which the sum ?SP of the hydrogen bonding term and the polarity term of the solubility parameter is 8 to 18 MPa1/2 is 30 mass % or more and less than 95 mass % of the total amount of the organic solvents; and the content of the surfactant is less than the critical micelle concentration of the surfactant.

Abstract: An inkjet head with a harmonica-type head tip is configured in a way that wirings electrically connected to drive electrodes within channels are led rearward from a rear surface of the head tip. A groove is provided along an array direction of the channels in areas on the rear surface of the head tip in which the channels are not formed. A lead-out electrode, which is electrically connected to drive electrodes, is formed from the rear surface of the head tip to the interior of the groove. One end of a wiring member, which has connecting wirings upon an insulating material corresponding to the lead-out electrodes, is inserted into the groove. The drive electrode is electrically connected to the connecting wiring via the lead-out electrode as a result of the electrical connection of the connecting wiring within the groove to the lead-out electrode.

Abstract: A nozzle plate holding device having a holding section which holds a nozzle plate arranged with a plurality of nozzles, and the nozzle plate holding device being used for bonding the nozzle plate, while the holding section holds the nozzle plate, onto a head chip arranged with a plurality of channels, wherein the holding section is configured to be capable of causing a distortion deformation of the nozzle plate in a direction that is parallel to a surface of the nozzle plate and crosses a length direction of the nozzle plate.

Abstract: A driving waveform has a first driving waveform (PLSTM1) composed of non-GND waveform, a second driving waveform (PLSTM2) composed of a non-GND waveform different from the first driving waveform, and a third driving waveform (PLSTM0) composed of a GND waveform, and a driving voltage V1 of the first driving waveform and a driving voltage V2 of the second driving waveform is |V1|>|V2|; and the driving circuit selects at least the first driving waveform and the second driving waveform or only the first driving waveform at every predetermined time in 1 pixel cycle in accordance with the discharge data, applies this to one of the two driving electrodes of the pressure generating unit and also applies only the second driving waveform to the other so as to operate the pressure generating unit by a differential waveform between the two driving electrodes.

Abstract: A drive signal generating unit that generates a drive signal applying, in one pixel period, at least one drive waveform for causing ink droplets to be discharged can generate two types of drive waveforms, a large droplet waveform and a small droplet waveform. The large droplet waveform includes an expansion pulse expanding the volumes of pressure chambers and a contraction pulse making the volumes of the pressure chambers contract. The expansion pulse width of the large droplet waveform is 2.8 AL or longer but 3.4 AL or shorter. The small droplet waveform includes an expansion pulse, a pause period, and a contraction pulse, and the expansion pulse width of the small droplet waveform is 0.8 AL or longer but 1.2 AL or shorter, where AL represents a half of an acoustic resonance period of a pressure wave in the pressure chamber.

Abstract: The invention provides a non-aqueous jet printing ink which has printability (abrasion resistance and resistivity to wiping with alcohol) suitable for recording media made of plastics such as polyvinyl chloride and which is excellent in safety and can be used without problematic odor, and a method of ink-jet recording with the ink. The non-aqueous jet printing ink is characterized by containing, as the essential components, a pigment, a pigment derivative having an acid group, a fixing resin, and a compound (A) consisting of one or more members selected from the group consisting of compounds represented by the general formulae (1) and (2).

Abstract: An actinic energy radiation curable ink-jet ink comprising an actinic energy radiation polymerizable compound, wherein the actinic energy radiation polymerizable compound comprises a vinyl ether compound, a total content of the vinyl ether compound is 30% or more by mass, the vinyl ether compound comprises a bis-vinyl ether compound and a multifunctional vinyl compound having three or more vinyl ether groups, 10 to 70% by mass of the ink is the bis-vinyl ether compound, and 5 to 70% by mass of the ink is the multifunctional vinyl compound having three or more vinyl ether groups.

Abstract: An inkjet recording device, wherein air can be retained in an ink supply pipe by using a simple structure without applying substantial changes to the inkjet recording device, a variation in an ink supply pressure is mitigated by the retained air, and ink can be ejected with high stability. An inkjet recording device is provided with an inkjet head for ejecting ink, an ink flow path for supplying the ink, which is supplied from an ink supply source, to a pressure chamber of the inkjet head and having at least a portion thereof constructed from an ink supply pipe, and an air retaining member inserted in the ink supply pipe, with the ink allowed to pass through the air retaining member, and retaining air in at least a portion of a space formed between the air retaining member and the inner surface of the ink supply pipe.

Abstract: A method for forming a metallic pattern, which is provided with a printing process to print a pattern portion on a substrate by means of an inkjet method utilizing ink containing a precursor of a nonelectric plating catalyst and a plating process to form a metallic pattern by nonelectric plating on said pattern portion, wherein the surface of said substrate is constituted of ink non-absorptive resin and has been subjected to a plasma treatment, and said ink has a pH value at 25° C. of not less than 9.0.

Abstract: A flow path regulating member for regulating an ink flow path leading into the channels is formed on the rear side of the head chip by exposure and development through lamination of the photo masks having an opening of a predetermined pattern, after a photosensitive resin film has been bonded on the rear side of the head chip by heat and pressure without using an adhesive; this head chip being characterized in that the channels, and drive walls made up of piezoelectric elements are arranged alternately, the apertures of the channels are arranged on the front side and rear side, respectively, and drive electrodes are formed in channels.

Abstract: Provided is an image forming apparatus for an inkjet recording having improved bleed resistance and stickiness resistance of formed image, exhibiting excellent abrasion resistance and adhesion to the recording medium, and having capability of printing onto recording medium with low softening temperature. An image forming apparatus for an inkjet recording method that forms an image by jetting a photo-curable inkjet ink comprising a colorant, a photo-curable monomer, a photo-initiator and a gelling agent onto a recording medium, and photo-curing the ink by a light irradiation apparatus, wherein an illuminance of the light irradiation apparatus is 1 mW/cm2 or more and 50 mW/cm2 or less, the apparatus comprising: a warming section for warming the photo-curable inkjet ink at a temperature of 5 to 30° C. higher than a gelling temperature of the photo-curable inkjet ink, and a control section for controlling a surface temperature of the recording medium at a temperature of 5 to 30° C.

Abstract: Provided is an inkjet ink which can form high-quality images with high abrasion resistance and adhesiveness on a non-absorptive recording medium and which exhibits high ejection properties and excellent storage stability. Also provided is an inkjet recording method. An inkjet ink which comprises water, a pigment, a water-soluble resin, a water-soluble organic solvent and a surfactant, characterized in that: the water-soluble resin comprises a water-soluble resin consisting of a copolymer resin which has an acid value of 50 to 130 mgKOH/g, a glass transition temperature (Tg) of 30 to 100° C.

Abstract: The present invention provides an actinic energy radiation curable ink-jet ink exhibiting excellent ink storage stability, nozzle ink repellency, and ejection stability, and also exhibiting excellent curability, anti-abrasion properties, solvent resistance, flexibility, weather resistance, and substrate adhesion properties even under various ambience factors and irradiation conditions, as well as an ink-jet recording method and printed matter using the same. In an actinic energy radiation curable ink-jet ink containing a cationically polymerizable compound and a photo-cationic polymerization initiator, an actinic energy radiation curable ink-jet ink wherein a cationically polymerizable compound having a vinyl ether group as a reactive group is contained at 50.0% by mass or more and the halogen ion content is 1.0 ?g/g of the ink-100 ?g/g of the ink.

Abstract: Disclosed is a method for producing an ink-jet head which enables the formation of an ink-repellent layer having excellent ink ejection stability, excellent adhesion to a head base material and excellent pressure resistance in a simple manner. The method for producing an ink-jet head is characterized by applying a coating solution comprising a compound represented by Formula (1) and an aqueous dispersion of a fluororesin to an ink-ejecting surface of an ink-jet head to form an ink-repellent layer on the ink-ejecting surface.

Abstract: A water-based ink for inkjet recording is provided with color material, binder resin, surfactant, and water-based solvent, wherein when the ink is heated, 1) a viscosity of the ink is more than 10 mPa·s and 30 mPa·s or less, the viscosity being measured over the ink weight change rate range of 0% to 10%; 2) a viscosity of the ink is 200 mPa·s at any one of the ink weight change rate within 35% or more and 55% or less, the viscosity being measured by the E-type viscometer at 25° C. and 1 rpm; and 3) a surface tension at 25° C. of the ink at the ink weight change rate of 5% is lower than a surface tension at 25° C. of the ink at the ink weight change rate of 0%.

Abstract: Disclosed is an ink jet head exhibiting good assemblability while protecting an electrode portion. An ink jet head (10) comprising a head chip (2) including drive walls (22) and channels (23) juxtaposed alternately with a drive electrode (25) being formed on the drive wall (22), and a nozzle plate (24) wherein a connection electrode is formed on the rear surface of the head chip (2), a wiring board (3) on which an electrode portion (32) is formed is bonded to project from the head chip (2), and ink in the channel (23) is ejected by causing shear deformation of the drive wall (22) is further provided with a holding member (5) disposed at a position covering the electrode portion (32) and holding a portion (31) of the wiring board (3) projecting from the head chip (2), and an electrode portion protection member (4) bonded between the holding member (5) and the electrode portion (32) using adhesive and having a thickness in the range of 0.01-0.5 mm at a part covering the electrode portion (32).