Abstract: Disclosed are an ink jet recording ink set which is suppressed in bleeding and shot droplet interference and can form a high quality image and an ink jet image recording method. The ink jet recording ink set has plural liquids including at least a first liquid and a second liquid. The second liquid contains a polymerizable compound and the first liquid contains a high-boiling point organic solvent and the high-boiling organic solvent meets any one of the following requirements (A) to (C) and an ink jet image recording method includes supplying a first and a second liquid simultaneously or sequentially to a recording medium such that both liquids are in contact with each other, to form an image: (A) it has a viscosity of 100 mPa·s or less at 25° C. and a viscosity of 30 mPa·s or less at 60° C. and has a boiling point of 100° C.

Abstract: An inkjet printing system includes an inkjet printer responsive to digital signals and containing an ink composition having: (a) water, (b) dispersed pigment particles, (c) a humectant, and (d) a polyurethane additive having at least a first soft segment having siloxane groups, the additive having a weight average molecular weight of at least 10,000 daltons and a sufficient number of acid groups to provide an acid number greater than 60. An improved combination of scratch resistance and jetability is obtained.

Abstract: An ink set for ink-jet recording which includes multiple inks having different colors. Each of the multiple inks includes a colorant, a water-soluble organic solvent, a fluorine-based surfactant, and water. The viscosity difference among the multiple inks is 2.0 mPa·s or less at a temperature of 25° C. and a shearing speed of 230 1/s, and the viscosity difference among the multiple inks is 0.5 mPa·s or less at a temperature of 25° C. and a shearing speed of 100,000 1/s.

Abstract: A multi-phase system for creating a metallic effect on a substrate, comprising applying to the substrate a first ink jet ink comprising a dispersion of reflective metallic particles in a suitable carrier system, to form a reflective coating layer; and applying a second ink jet ink over the reflective coating layer to form a protective coating layer. Optionally, an undercoat layer is printed on the substrate prior to applying the first ink jet ink. The second ink jet comprises at least one crosslinkable polymer or is otherwise energy curable. The second ink jet ink optionally imparts a color to the metallic image.

Abstract: A water-based ink for ink-jet recording includes a coloring agent, water, and a water-soluble organic solvent. In the water-based ink after drying, a tan ? at a frequency of about 100 (1/sec) measured at about 25° C. represented by the following Equation (1) is about 4 or more tan ?=G?/G???(1) tan ?: loss tangent G?: storage elastic modulus G?: loss elastic modulus.

Abstract: An inkjet ink comprising polymeric fluoro-polymeric additives providing enhanced pen and print quality performance.

Abstract: In the image-recording of an intermediate transfer system applying an ink jet recording method, reactive liquid reactable with ink is properly formed on the intermediate transfer body. By using the intermediate transfer body having a pattern consisting of lyophilic and lyophobic sections on a surface thereof, the reactive liquid is uniformly applied to the intermediate transfer body to form a layer having a suitable thickness. Thereby, it is possible to form an ink image on the intermediate transfer body while preventing the miss landing of ink droplets and restricting the deformation of an ink dots. By transferring this ink image to a recording medium, it is possible to form a high-quality ink image on various kinds of recording media in a stable manner.

Abstract: There is provided a recording ink containing: solid constituents, which contain a colorant and a resin, and stay solid in the ink having a temperature of 25° C.; liquid constituents, which have a higher boiling point than a boiling point of water, and stay liquid in the ink having a temperature of 25° C.; and water, wherein a total amount of the solid constituents in the recording ink is in the range of 2.0% by mass or more to less than 20% by mass, wherein a ratio A/B of a total amount of the liquid constituents in the recording ink A to the total amount of the solid constituents in the recording ink B is from 0.70 to 1.75, and wherein the viscosity of the recording ink at 25° C. is 10 mPa s or less.

Abstract: An ink composition is provided and includes: a dye; and at least one polymer of an oxidation-resistant polymer having a weight-average molecula weight of 3,000 or more, an association-accelerating polymer and an amidic polymer. An image printed with the ink composition has an ozone degradation rate of 1/5 or less of that of an image printed with an ink composition free of the at least one polymer. The ink composition has an extremely high image durability.

Abstract: The present disclosure provides method of ink jet printing onto a substrate comprising, in any workable order, the steps of: (a) providing an ink jet printer that is responsive to digital data signals; (b) loading the printer with a substrate to be printed; (c) loading the printer with an aqueous ink jet ink comprising an ink vehicle and an aqueous dispersion, wherein the aqueous dispersion comprises a solid particle and a polymeric dispersant that has been crosslinked, wherein the polymeric dispersant is a block copolymer comprising an A block and a B block, wherein the A block is a segment having a block size of about 5 to about 18 units, and comprises at least 50% by weight of a monomer, having the following structure: CH2?CRC(O)O(CHR1CH2O)nR2; wherein R and R1 are H, or methyl; R2 is alkyl of 1-4 carbon atoms or phenyl; and n is about 1 about 20; and the B block is a segment comprising an ionic monomer and at least one hydrophobic monomer; and wherein the dispersant comprises a crosslinkable moiety; where

Abstract: An aqueous ink to be used together with a pigment ink containing a pigment and a polymer, wherein the aqueous ink contains a reactive component for destabilizing the dispersion state of the pigment, the dynamic surface tension of the aqueous ink at a lifetime of 30 milliseconds is 41 mN/m or more, and the dynamic surface tension of the aqueous ink at a lifetime of 500 milliseconds is from 28 mN/m or more to 38 mN/m or less as determined by a maximum bubble pressure method.

Abstract: An ink-jet recording method is provided. The ink-jet recording method includes (i) supplying an aqueous treatment liquid containing a fixing agent for fixing the components contained in an aqueous ink, on an art paper or a coat paper, in an amount of from ?50% to +30% with respect to the value of ?V [ml/m2] determined by the following formula (I), and (ii) recording an image by ejecting an aqueous ink containing a colorant, resin particles, an aqueous organic solvent and water, on the art paper or coat paper by an ink-jet method. In Formula (I), Vr represents a roughness index of the art paper or coat paper obtained from a measurement of liquid absorbability according to the Bristow method, and Vi represents an amount of transfer at the inflection point where the value of the absorption coefficient of the art paper or coat paper changes in the measurement of liquid absorbability according to the Bristow method.

Abstract: A system for printing on an edible substrate includes an inkjet printer and a jetting fluid. The fluid is suitable for use on an edible substrate, and has a desirable viscosity and surface tension.

Abstract: An image recording composition including a curable material that is cured upon application of an external stimulus, and a cationic resin having a cationic functional group.

Abstract: In an ink jet print head formed with ejection nozzles, which may use a wiping member to wipe ink adhered to the surface of the ink jet print head, it is desired to be able to perform a wiping operation in any environment without requiring a large amount of space to accommodate the liquid used during the wiping operation. To this end, a cooling unit is used which can produce water by cooling the atmosphere. This cooling unit is operated to produce water, which is brought into contact with and transferred onto the wiping member before the wiping member performs wiping.

Abstract: The present invention provides an ink jet printer having an ink-contacting member which is in contact with an ink until the ink is injected from a print head and which contains an antioxidant, wherein the ink-contacting member has a concentration of a compound represented by the following formula (1) of 100 ppm or less: Further, an ink jet recording method using the ink jet printer and recorded matter recorded by the ink jet recording method are also disclosed. According to the invention, there is provided an ink jet printer using an ink-contacting member which inhibits the formation of a crystalline molecular complex.

Abstract: The present invention relates to a method of preparing a polymer modified pigment comprising the steps of, combining, in any order, a modified pigment comprising a pigment having attached at least one reactive group, a polymer comprising at least one functional group, and a non-reactive diluent, to form a reaction mixture, reacting the polymer and the modified pigment in the reaction mixture to form a mixture comprising the polymer modified pigment and the non-reactive diluent; and removing the non-reactive diluent from the mixture to form the polymer modified pigment. Also disclosed are the resulting polymer modified pigments and inkjet ink compositions comprising them.

Abstract: An ink-jet recording process which conducts recording by imparting ink onto the surface of a recording medium according to recording information, where the recording medium has a base material and a porous ink receiving layer thereon containing inorganic particles having a BET specific surface area of at least 150 m2/g, and the ink contains a polymer emulsion having a water-insoluble or hardly-soluble colorant contained in polymer fine particles and at least one wetting agent, 8-11 C polyol or glycol ether, anionic or nonionic surfactant, water-soluble organic solvent, and water; and has a surface tension of 40 mN/m or less at 25° C. This process can provide high-grade images excellent in ink absorbing and fixing properties and satisfactory in color tone, produce images excellent in image fastness such as water resistance and light resistance, and implement ink-jet recording excellent in storage stability and discharge stability and free from head clogging at printing.

Abstract: The present invention provides a recording ink including a composite pigment particle, a water-soluble solvent, and water, wherein the composite pigment particle is a primary particle coated with a coating resin, wherein the primary particle is a white pigment on the surface of which an oil-soluble dye is adsorbed or attached. In one aspect, the white pigment is preferably at least one selected from a white inorganic pigment, a pearl pigment, and an extender pigment, in another aspect, the coating resin is preferably one of a (meth)acrylic resin, a polyester resin, and a polyurethane resin, wherein the acid value of the coating resin is from 50 mgKOH/g to 250 mgKOH/g, and in another aspect, an average particle diameter (D50%) of the composite pigment particle is preferably 150 nm or less.

Abstract: An inkjet recording liquid contains water, an organic solvent, a pigment, and a pigment dispersing resin. An weight-average molecular weight of the pigment dispersing resin exceeds 30000 and is 150000 or less. A mass ratio of the pigment dispersing resin to the pigment in the recording liquid (resin content/pigment content) is 0.1 or more and 1.0 or less. An acid value of the pigment dispersing resin is 160 or more and 240 or less. The inkjet recording liquid is discharged from a recording head of the inkjet recording device. Even when nozzles of the recording head become clogged due to drying or thickening of the inkjet recording liquid, the nozzle clogging can be easily resolved with a purge operation and wiping operation of the recording head by a wipe unit. Thus, it is possible to reduce an overconsumption of the recording liquid due to the foregoing purge operation.

Abstract: A pigment ink for ink-jet recording which is excellent in freezing resistance and fixability includes a pigment, an aqueous resin emulsion, polyethylene glycol and diethylene glycol. This ink satisfies the following formulae (1), (2) and (3): A<15??(1) A+B>10??(2) 30?A×?+B?64??(3) wherein: A is the content of polyethylene glycol (%); B is the content of diethylene glycol (%); and ? is the molecular weight ratio of polyethylene glycol to diethylene glycol.

Abstract: Systems and methods for digitally printing images onto substrates are provided using digital inks and catalysts which initiate and/or accelerate curing of the inks on the substrates. The ink and catalyst are kept separate from each other while inside the heads of an inkjet printer and combine only after being discharged therefrom. The system produces high-quality, high-resolution images on substrates that may not normally receptive to low-viscosity digital inks.

Abstract: Disclosed herein is a fast drying solvent-based inkjet ink composition for thermal inkjet printing. The ink composition includes at least 40 weight percent base solvent, a solvent-compatible colorant, not more than 25 weight percent propellant, a decap-controlling additive, from 0.5 weight % to 3.5 weight % of a binder resin and not more than 5 weight % water. The application also relates to the method and system for inkjet printing with the above-described ink.

Abstract: An image forming apparatus includes a supply unit that supplies liquid recipient particles to receive liquid; a conveyance unit that conveys the liquid recipient particles supplied by the supply unit; a discharge unit that discharges liquid droplets to the liquid recipient particles conveyed by the conveyance unit; a humidity reducing unit that reduces relative humidity inside or around the supply unit; and a humidity increasing unit, on a downstream side of the supply unit, that increases relative humidity around at least one of the liquid recipient particles conveyed by the conveyance unit and the discharge unit.

Abstract: The present invention relates to (A) a water dispersion for ink-jet printing including particles of a waster-insoluble crosslinked polymer which contain a colorant, and a water-insoluble organic compound, wherein the water-insoluble crosslinked polymer is (1) a polymer produced by crosslinking a water-insoluble polymer with a crosslinking agent; (2) a polymer produced by crosslinking 100 parts by weight of the water-insoluble polymer with 0.5 to 9.5 parts by weight of the crosslinking agent; or (3) a polymer having a weight-average segment molecular weight of from 1,400 to 20,000 as calculated from [(weigh-average molecular weight of the water-insoluble polymer)/(number of molar equivalents of the crosslinking agent to be reacted with 1 mol of the water-insoluble polymer+1)]; (B) an ink for ink-jet printing containing the above water dispersion which is excellent in gloss and storage stability; and (C) particles of the water-insoluble crosslinked polymer.

Abstract: Methods and means for imaging on paper media are provided. A data file of an image to be printed is analyzed. A pattern for a clear fluid is determined according to the analysis. The pattern of clear fluid is applied to a paper media traveling in a particular direction, wherein the pattern is generally elongated along the direction of travel. The pattern of clear fluid is defined by a maximum width that is generally equal to the maximum width of the image to be formed. One or more colored inks are applied such that the image is formed and is supported by the paper media. The paper media exhibits reduced cockle as a result of the pattern of clear fluid.

Abstract: An ink containing a hydrophobic colloid charged with a positive zeta potential when the pH of the ink is within a range of over 4 and under 6. Silicon or silicon compound can be limited from being eluted into the ink from a circuit board formed from a silicon wafer or the like. Additionally, silicon or silicon compound, if eluted into the ink can be prevented from being deposited on a resistance heater and causing “cogation”, or to prevent the silicon or silicon compound from being deposited in an ink channel and nozzle to clog the nozzle.

Abstract: An ink containing a hydrophobic colloid charged with a positive zeta potential when the pH of the ink is within a range of over 4 and under 6. Silicon or silicon compound can be limited from being eluted into the ink from a circuit board formed from a silicon wafer or the like. Additionally, silicon or silicon compound, if eluted into the ink can be prevented from being deposited on a resistance heater and causing “cogation”, or to prevent the silicon or silicon compound from being deposited in an ink channel and nozzle to clog the nozzle.

Abstract: The present disclosure relates to a fast drying solvent-based inkjet ink composition for thermal inkjet printing, the ink composition comprising at least 40 weight percent base solvent, a solvent-compatible colorant, not more than 25 weight percent propellant, a decap controlling additive, and not more than 5 weight percent water. The present disclosure also relates to the method and system for inkjet printing with the above-described ink.

Abstract: An ink composition includes (A) at least one polymerizable compound selected from the group consisting of a monofunctional radically polymerizable monomer having an aliphatic cyclic structure, an N-vinyllactam, and an aromatic monofunctional radically polymerizable monomer, (B) a radical polymerization initiator, (C) a pigment, and (D) a graft copolymer having a repeating unit represented by the formula below in a graft chain: wherein R denotes a hydrogen atom or a methyl group, X denotes a single bond, —O—, —CO—, —COO—, —CONR1—, —OCO—, or a phenylene group, R1 denotes a hydrogen atom, an alkyl group, an aryl group, or an aralkyl group, L denotes a single bond or a divalent linking group, Z denotes —NR2R3, R2 and R3 independently denote a hydrogen atom, an alkyl group, an aryl group, or an aralkyl group, and R2 and R3 may be bonded to each other to form a ring.

Abstract: An ink set for inkjet recording is provided that includes at least a colored liquid composition having at least a radically polymerizable compound, a photopolymerization initiator, and a colorant, and an undercoat liquid composition having at least a radically polymerizable compound and a photopolymerization initiator, the colored liquid composition having as the photopolymerization initiator at least one type of ?-aminoacetophenone compound, and the undercoat liquid composition having as the photopolymerization initiator at least one type of compound selected from the group consisting of an acylphosphine oxide compound, an ?-hydroxyacetophenone compound, and an oxime ester compound.

Abstract: An ink composition containing at least a polymerizable composition, a pigment, and a polymer represented by General Formula (1): where R1 represents an (m+n)-valent organic linking group, R2 represents a single bond or divalent organic linking group; A1 represents a monovalent organic group having a pigment adsorption structure that contains at least one selected from organic pigment structure, heterocyclic structure, acidic group, group having a basic nitrogen atom, urea group, urethane group, group having a coordinating oxygen atom, hydrocarbon group having 4 or more carbon atoms, alkoxysilyl group, epoxy group, isocyanate group, and hydroxyl group; the n groups A1 and bonds or groups R2 may independently be the same or different; “m” is 1 to 8, “n” is 2 to 9, and m+n is 3 to 10; P1 represents a polymer skeleton; and the m skeletons P1 may be the same or different.

Abstract: Compositions and methods for printing on specialty media are disclosed. The methods comprise the steps of providing a fixing fluid, providing a dye- or pigment-based ink-jet ink containing an effective amount of a polyvinyl(alcohol-acetate) species, jetting the fixing fluid onto the specialty media forming a coated substrate, and jetting the ink-jet ink onto the coated substrate. Additionally, a gelled printed image on a substrate is disclosed comprising a fixing fluid containing a fixing agent and an aqueous ink-jet ink containing a polyvinyl(alcohol-acetate) species. In both the method and with respect to the image, the polyvinyl(alcohol-acetate) species used can be a known species, or one of a number of new graft copolymers containing a polyvinyl(alcohol-acetate) polymer as one of the constituents of the copolymer.

Abstract: A single phase aqueous composition suitable for thermal inkjet printing comprises a mixture of curable materials including at least two curable oligomers; and one or more co-solvents for the curable materials.

Abstract: An aqueous inkjet ink is described including water, a charge stabilized anti-abrasion polymer provided as a hydrophobic colloidal sol, a water-soluble humectant and a polyethyleneglycol-diether compound of Formula I as an anti-abrasion aid: R1—(OCH2CH2)nO—R2 ??(I) where R1 and R2 can be the same or different and are individually alkyl with 1 to 4 carbons, or phenyl, and n is between 2 and 45. Also described is a related aqueous inkjet ink-set and an image forming method having the step of imagewise applying by jetting to a receiver, one or more aqueous inks, as above described.

Abstract: The present invention pertains to a yellow ink for inkjet printing and, in particular, to a yellow ink containing a combination of specific yellow colorants, namely Direct yellow 169 and Acid Yellow 79. The present invention further pertains to ink set having this yellow ink. The ink and ink set are particularly advantageous for printing on plain and photo glossy paper.

Abstract: An ink set includes a light gray ink, a medium gray ink, and a black ink. Each of the inks in the ink set includes a carboxylic polymer. The light gray ink has a carboxylic polymer load equal to or greater than about 4.27 wt %. The medium gray ink has a carboxylic polymer load ranging from about 2.47 wt % to about 3.47 wt %. The black ink has a carboxylic polymer load ranging from about 0.5 wt % to about 2 wt %.

Abstract: A coating liquid for use in an ink jet recording method comprising an image forming step of forming an image on a recording medium by an ink jet system with an ink comprising at least a pigment and a coating layer forming step of applying a coating liquid at least to a region including the image to form a coating layer having a film thickness of from 0.10 ?m or more to 1.0 ?m or less in at least a part thereof. The coating liquid comprises at least a slippery compound, water and a water-soluble organic solvent. The coating layer has a coefficient of kinetic friction of 0.40 or less.

Abstract: An ink-jet ink including water, a pigment dispersion, a water-soluble polymerizing or cross-linking substance having an ethylenic unsaturated group, and a water-soluble photo-initiator, wherein the pigment dispersion is anionic, and the photo-initiator is anionic and a cleaving-type photo-initiator having an anionic group pendanted on a mother nucleus selected from a benzylketal type mother nucleus, a benzoine type mother nucleus, an a-hydroxyacetophenone type mother nucleus, and an oxime ester type mother nucleus.

Abstract: There is provided an ink for recording, which contains: a coloring agent; a water-dispersible resin; a wetting agent; a surfactant; and water, wherein a total solid content of the coloring agent and the water-dispersible resin is 10% by mass to 30% with respect to a total mass of the ink, a ratio B/C is 0.1 to 1.6 where B is a solid content of the coloring agent in the ink, and C is a solid content of the water-dispersible resin in the ink, a viscosity of the ink is 5 mPa·s to 20 mPa·s at 25° C., and a surface tension of the ink is 35 mN/m or less.

Abstract: Ink, ink sets, and methods of printing are provided. The inks can include an aqueous solvent system including from about 5 wt % to about 20 wt % organic co-solvent, from about 2 wt % to about 5 wt % black dye, and a dye selected from cyan, magenta, and yellow dyes. The ink can be formulated such that upon printing on a print medium, the printed ink or inks can maintain a neutral black, defined by a chroma value of less than 7. This neutral black can be maintained such that the printed ink or image has a chroma value of less than 7 for substantially all L* values ranging from about 7 to about 12.

Abstract: A print data generating apparatus to generate print data which is used for printing in a printing apparatus based on image data by using a white colorant and at least one non-white colorant is provided. The print data generating apparatus comprises an image data inputting system, whereby white image data indicating white density levels of an image to be printed is inputted, a colorant data generating system, which generates white colorant data wherein color information of each of a plurality of pixels configuring the white image data is converted into the white colorant level, and a print data generating system, which generates white print data to be used for printing with the white colorant in the printing apparatus based on the white colorant data.

Abstract: A recording ink containing at least: water; a water-soluble organic solvent; a surfactant; and a carbon black having a hydrophilic group on a surface thereof, wherein at least part of a terminal of the hydrophilic group on the carbon black is substituted with an alkali metal, wherein the carbon black releases humic acid in an aqueous dispersion of the carbon black, which is recovered from the recording ink, a concentration of the humic acid released in the aqueous dispersion containing 20% by mass of the carbon black of is expressed with a maximum absorbance at a wavelength of 230 nm to 260 nm, and the recording ink has the maximum absorbance of 5.0 to 20.0 at the wavelength of 230 nm to 260 nm.

Abstract: A method of manufacturing a liquid ejection head and a liquid ejection head capable of preventing corrosion of electrodes are provided. The method of manufacturing a liquid ejection head includes: a step of forming porous silicon areas in portions of a silicon substrate where the liquid paths are to be formed; a step of forming in layers in the porous silicon areas a protective layer, a heating resistor layer, an electrode layer and a heat accumulation layer; a step of forming ink ejection openings in the silicon substrate; and a step of removing the porous silicon areas.

Abstract: A reaction liquid destabilizing the dissolved state or dispersed state of a coloring material by being in contact with an ink containing the coloring material on a recording medium, wherein the reaction liquid contains at least calcium ions, glycerin and polyethylene glycols, and wherein the content and ratio of these components are specified.

Abstract: An aqueous ink comprises water, a water-insoluble coloring material, and plurality of water-soluble organic solvents and the plurality of water-soluble organic solvents including a good medium or good mediums for the water-insoluble coloring material and a poor medium or poor mediums for the water-insoluble coloring material. The ratio of the content of the poor medium and the content of the good medium is in a specific range. A water-soluble organic solvent showing the maximum Ka value out of respective Ka values of the plurality of water-soluble organic solvents is the poor medium. When the aqueous ink is in contact with a specific reaction liquid, the dissolution state or dispersed state of the water-insoluble coloring material in the ink is made unstable. As a result, an image which has a sufficiently large area factor even with a small amount of ink droplets and is excellent in image density, bleeding resistance, and fixability can be obtained.

Abstract: The present invention provides an inkjet-recording ink set including multiple kinds of liquid including at least first and second liquids, wherein the first liquid contains a metal compound dissolved therein, and at least one of the multiple kinds of liquid contains a polymerizable compound. The invention also provides an inkjet-recording ink including at least a high-boiling-point organic solvent and a metal compound. The multiple kinds of liquid contain substantially no water and no low-boiling-point organic solvent.

Abstract: An ink set includes a combination of a first ink and a second ink, the first ink containing a self-dispersion pigment having at least one hydrophilic group directly or through another atomic group bonded to the surface of the pigment particle, and ammonium ions, the second ink containing a pigment, a polymer having an acid value of 160 mg KOH/g or less, and alkali metal ions, wherein the first ink further contains a compound (A) selected from nonionic surfactants and/or a compound (B) selected from the group consisting of polyethylene glycol with an average molecular weight of 600 to 2,000, ?,?-alkanediol having six carbon atoms, and an imidazolidinone derivative.

Abstract: Highlighter ink compositions can be prepared which provide improved abilities to reduce smear during highlighting. Highlighter ink compositions can include an acid buffer having a pKa from about 2 to about 6, a highlighter colorant, and a liquid vehicle. The image for highlighting can be formed on the substrate using any conventional printing technique, such as ink-jet printing or other printing techniques. Application of the highlighter ink compositions of the present invention to a printed image results in a reduced degree of image smear, particularly when the image was produced by an ink-jet printing process. Further, the acid buffer can be configured for reducing mobility of specific ink-jet colorants. In this way, the highlighter ink composition can be specifically tailored for reducing smear of various printed inks.

Abstract: An inkjet printer using solvent ink containing an organic solvent and a colorant. The inkjet printer includes an inkjet head configured to eject the solvent ink to a medium, and a microwave irradiation unit configured to irradiate the medium, to which the solvent ink was ejected, with microwaves.