Abstract: An inkjet recording device may include a plurality of pressure-generating chambers compartmented by walls including electromechanical conversion devices for generating a pressure; nozzles connected to the pressure-generating chambers; an ink supply portion; and a drive pulse generation device for driving said electromechanical conversion devices. The pressure-generating chambers may be separated into a plurality of groups. The pressure-generating chambers in each group may be driven in series so as to eject ink drops from said nozzles.

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: An inkjet recording device may include a plurality of pressure-generating chambers compartmented by walls including electromechanical conversion devices for generating a pressure; nozzles connected to the pressure-generating chambers; an ink supply portion; and a drive pulse generation device for driving said electromechanical conversion devices. The pressure-generating chambers may be separated into a plurality of groups. The pressure-generating chambers in each group may be driven in series so as to eject ink drops from said nozzles.

Abstract: An inkjet recording device for ejecting ink onto a recording medium to form an image on the recording medium while a recording head is moved with relative movement to the recording medium in a direction along an upper surface of the recording medium, including: a recording head for ejecting ink onto a recording medium; a heating device for heating the recording medium; a conveyance device for conveying the recording medium having been heated by the heating device to under the recording head; and a cooling device which is provided in a state of insulation from the recording head, and has a cooling surface which is cooled to a temperature lower than a temperature of a nozzle surface of the recording head, wherein the cooling surface and the nozzle surface of the recording head are disposed along a direction of the relative movement and to face the recording medium.

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: An inkjet recording device for ejecting ink onto a recording medium to form an image on the recording medium while a recording head is moved with relative movement to the recordin medium in a direction along an upper surface of the recordin medium including: a recording head for ejecting ink onto a recording medium; a heating device for heating the recording medium; a conveyance device for conveying the recording medium having been heated by the heating device to under the recording head; and a cooling device which is provided in a state of insulation from the recording head, and has a cooling surface which is cooled to a temperature lower than a temperature of a nozzle surface of the recording head, wherein the cooling surface and the nozzle surface of the recording head are disposed along a direction of the relative movement and to face the recording medium.

Abstract: An ink-jet recording method of recording an image on a recording medium by jetting from a line head type ink-jet recording head ink droplets which are curable by being irradiated with active energy rays, comprises steps of conveying step of conveying the recording medium in a conveying direction; jetting ink droplets to form first ink dots on the recording medium; irradiating active energy rays onto the first ink dots formed on the recording medium; jetting ink droplets having the same color as that of the first ink dots at a downstream position of the first jetting step in terms of the conveying direction to form second ink dots so as to partially overlap on the first ink dots; and irradiating active energy rays onto the second ink dots formed on the recording medium.

Abstract: An ink-jet ink comprising Component (A), Component (B), and Component (C), wherein a content of Component (A) is 20-60% by weight, a content of Component (B) is 10-50% by weight, and when the content of Component (A) is 100% by weight, the total content ratio of a class of glycol, a class of polyol, and glycerin is 0-20% by weight, and a surface tension of the ink-jet ink is 18-27 mN/m; wherein Component (A) is 1,3-dimethyl-2-imidazolidinone or ?-butyrolactone, Component (B) is water, and Component (C) is a pigment.

Abstract: Disclosed is an inkjet ink having printing aptitude with various recording media, excellent feathering resistance, beading resistance and bleed resistance, high adhesion to a recording medium, and high print quality. Also disclosed are an inkjet set and an inkjet recording method. Specifically disclosed is an inkjet ink containing at least a colorant, water and a polymer compound which has a plurality of side chains on a hydrophilic main chain and is cross-linkable between the side chains when irradiated with an active energy ray.

Abstract: An ink-jet ink comprising Component (A), Component (B), and Component (C), wherein a content of Component (A) is 20-60% by weight, a content of Component (B) is 10-50% by weight, and when the content of Component (A) is 100% by weight, the total content ratio of a class of glycol, a class of polyol, and glycerin is 0-20% by weight, and a surface tension of the ink-jet ink is 18-27 mN/m; wherein Component (A) is 1,3-dimethyl-2-imidazolidinone or ?-butyrolactone, Component (B) is water, and Component (C) is a pigment.

Abstract: An ink-jet ink containing: (a) a colorant; (b) water; and (c) a polymer produced by saponification of a polyvinyl acetate, wherein the polymer comprises a backbone and a group of first side chains and a group of second side chains, provided that the first chains are capable of cross-linking between the first chains by irradiation with actinic rays, and the second chains are capable of thermally reacting with a cross-linking agent.

Abstract: By employing an ink-jet ink and an ink-jet set characterized in that in an ink-jet ink incorporating at least water, an organic solvent, and a polymer compound having a plurality of side chains on a hydrophilic main chain, the polymer in which at least a part of the side chains are crosslinkable via exposure to actinic radiation, and the polymer exists in a dissolved state in the ink-jet ink, and the polymer has a property that all amount of the polymer is not dissolved in water when the polymer is mixed with water in an amount of the same content ratio as in the ink-jet ink, and an ink-jet recording method using the same, printing adaptability onto various printing media and ejection stability are achieved, and images exhibiting excellent color bleeding resistance and excellent beading resistance are prepared.

Abstract: An ink-jet ink comprising water, a pigment, Polymer A and Polymer B, wherein Polymer A is a polymer compound having a plurality of side chains on a hydrophilic main chain and capable of undergoing cross-linking among the side chains when exposed to active rays; and Polymer B is a copolymer which is obtained from a carboxylic acid containing monomer neutralized by an amine compound and a nonionic monomer having a hydrophobic moiety exhibiting adsorption capability of the pigment, and Polymer B exhibiting a weight-average molecular weight of 5,000 to 100,000, and an acid value of 50 to 500 mgKOH/g.

Abstract: An ink-jet ink containing a colorant, resin microparticles and a polymer, wherein the polymer has a hydrophilic main chain and a plurality of side chains and the polymer is capable of undergoing crosslinking between the side chains by irradiation with actinic radiation.