JP6409869B2 - Inkjet recording method and inkjet recording apparatus - Google Patents

Description

  The present invention relates to an ink jet recording method and an ink jet recording apparatus.

  In the ink jet recording method, ink is ejected from an ink jet head onto a recording medium, and an image is formed by a collection of ink droplets. The ink jet recording method is also used for textile printing. In the textile printing, an ink containing an aqueous medium and a colorant is usually used as the ink. In the textile printing, the recording medium is usually a fabric. In the case where an image is formed on the surface of the fabric by printing by the ink jet recording method, a fabric that has been pretreated with a pretreatment agent for suppressing ink bleeding is used as the fabric. Since the fabric pretreated with the pretreatment agent is usually used after being dried, it has a property of absorbing the aqueous medium of the ink.

  On the other hand, a one-pass inkjet recording method is known as one of the commercially advantageous inkjet recording methods. In the one-pass inkjet recording method, one or more inks are ejected from the inkjet head on the surface of the recording medium by a single scan on the recording medium of the inkjet head to form an image.

  When a plurality of colors of ink are superimposed on a recording medium having the absorptivity such as a cloth by the above-described one-pass ink jet recording method, a border of the color of the ink ejected later is formed in the formed image. , The image may lack detail.

  In the textile printing by the ink jet recording method, as a technique for suppressing bleeding due to ink soaking into the cloth, it is known to permeate a penetrating liquid (for example, see Patent Documents 1 to 3). However, in these ink jet recording methods, since the fabric is sufficiently wetted by the penetrating liquid, the ink spreads more in the fabric and the image density on the surface of the fabric may be insufficient, or the image is fine. May be missing.

JP 2011-179130 A JP 2013-007126 A JP2012-096513A

  An object of the present invention is to form a fine image even when an image is formed on an absorbent recording medium by a one-pass inkjet recording method.

The present invention relates to the following inkjet recording method.
[1] Two or more kinds of inks containing an aqueous medium and a colorant are ejected on the surface of the recording medium having the absorptivity of the aqueous medium by a single scan on the recording medium of an inkjet head. A one-pass inkjet recording method for forming an image, wherein the recording medium is a fabric or a non-woven fabric, and the inkjet recording method is configured such that the surface of the recording medium is ejected before the ink is ejected onto the recording medium. An ink jet recording method comprising a step of humidifying the ink.
[2] The inkjet recording method according to [1], wherein the surface is humidified with air having a relative humidity of 50 to 80%.
[3] The ink jet recording method according to [1] or [2], wherein the surface is humidified before each type of ink is ejected.
[4] The ink jet recording method according to any one of [1] to [3], wherein the ink contains glycols, and the content of the glycols in the ink is 15 to 60% by mass. .

The present invention also relates to the following ink jet recording apparatus.
[5] Inkjet for ejecting ink while moving in one direction relative to the recording medium, and forming the desired image with a single scan on the recording medium, and holding the recording medium A one-pass inkjet recording apparatus having a transport mechanism for moving the inkjet in one direction relative to the recording medium, wherein the recording medium is a fabric or a non-woven fabric, and the recording An ink jet recording apparatus, further comprising a humidifier for humidifying a surface of a front portion of the medium in a scanning direction of the ink jet head.
[6] The inkjet head has a plurality of nozzle groups for ejecting a plurality of colors of ink, each of the nozzle groups protrudes a different color of ink, and the humidifying device is connected to each of the nozzle groups. The ink jet recording apparatus according to [5], wherein a plurality of the ink jet recording apparatuses are arranged correspondingly and arranged in front of the nozzle group in the scanning direction.
[7] The inkjet recording apparatus according to [5] or [6], wherein the humidifier includes a nozzle for supplying air having a relative humidity of 50 to 80% to the surface of the recording medium.

  According to the present invention, before the ink reaches the surface of the recording medium, the surface of the recording medium is moistened with the same degree of wetness as that of the ink droplet landing. Droplets and ink droplets that subsequently land on the recording medium spread substantially the same. As a result, there is no bordering of the color of the subsequent ink around the formed image, so a fine image can be formed even when an image is formed on an absorbent recording medium by the one-pass inkjet recording method. .

1 is a diagram schematically illustrating an example of a configuration of an ink jet recording apparatus according to an embodiment of the present invention. FIG. 2A is a diagram schematically illustrating the configuration of the inkjet head unit according to the present embodiment when viewed in plan, and FIG. 2B schematically illustrates the configuration of the inkjet head unit as viewed from the side. FIG. 2C is a diagram schematically illustrating the configuration of the inkjet head unit as viewed from the front. FIG. 3A is a diagram schematically illustrating a state in which the first ink penetrates into the fabric. FIG. 3B is a diagram illustrating a state in which the fabric is humidified immediately before the first ink is ejected and the first ink is ejected. FIG. 3C is a diagram schematically illustrating how the second ink penetrates into the fabric when the second ink is further discharged. FIG. 3C illustrates the first ink without being humidified before discharging the first ink. It is a figure which shows typically a mode that 2nd ink osmose | permeates a fabric when 2nd ink is further discharged to the fabric after ink was discharged. It is a figure which shows typically the other example of the structure of the inkjet recording device which concerns on one Embodiment of this invention.

An embodiment of the present invention will be described below.
The ink jet recording method according to the present embodiment is a so-called one-pass method in which two or more inks are ejected onto the surface of a recording medium by a single scan on the recording medium of the ink jet head to form an image. Ink jet recording method.

[ink]
The ink contains an aqueous medium and a colorant. There are two or more of these inks, which are usually different color inks, but may be the same color inks. As long as two or more kinds of the ink are used, any number of inks may be used as long as the desired appearance can be obtained by overstrike.

  The aqueous medium is a liquid mainly composed of water, and is water or an aqueous solution. Examples of the solute of the aqueous medium include a salt and a water-soluble organic solvent.

  The content of the water-soluble organic solvent in the ink is preferably 15 to 70% by mass, and 30 to 60% by mass from the viewpoints of dissolving various components in the ink and from the viewpoint of ink drying properties. % Is more preferable. When the content is 15% by mass or more, it is preferable from the viewpoint of adjusting the liquid physical properties such as the viscosity of the ink and dissolving the surfactant. When the content exceeds 70% by mass, the drying property of the ink is deteriorated, the printed fabric is not dried, and the printed matter before heat treatment (coloring) may not be stacked or wound.

  Examples of the water-soluble organic solvent include polyhydric alcohols, amines, monohydric alcohols, polyhydric alcohol alkyl ethers, 2,2'-thiodiethanol, amides, heterocyclic compounds, and acetonitrile.

  Examples of the polyhydric alcohol include 1,6-hexanediol, 1,2-hexanediol, 1,5-pentanediol, 1,2-pentanediol, 2,2-dimethyl-1,3-propanediol, 2-methyl-2,4-pentanediol, 3-methyl-1,5-pentanediol, 3-methyl-1,3-butanediol, 2-methyl-1,3-propanediol and glycols are included.

  Examples of the glycols include ethylene glycol, glycerin, 2-ethyl-2- (hydroxymethyl) -1,3-propanediol, tetraethylene glycol, triethylene glycol, tripropylene glycol, 1,2,4-butane. Triols, diethylene glycol, propylene glycol, dipropylene glycol and butylene glycol are included.

  In particular, the content of the glycols in the ink suppresses excessive swelling of the water-soluble polymer of the fabric in addition to the reasons described above, and makes it easier for the ink discharged later to penetrate into the fabric. From the viewpoint of forming a higher definition image, it is preferably 15 to 60% by mass, and more preferably 30 to 60% by mass.

  Examples of the amine include ethanolamine and 2- (dimethylamino) ethanol.

  Examples of the monohydric alcohol include methanol, ethanol and butanol.

  Examples of the alkyl ether of the polyhydric alcohol include diethylene glycol monomethyl ether, diethylene glycol monobutyl ether, triethylene glycol monomethyl ether, triethylene glycol monobutyl ether, ethylene glycol monomethyl ether, ethylene glycol monobutyl ether, propylene glycol monomethyl ether, propylene glycol mono Butyl ether and dipropylene glycol monomethyl ether are included.

  Examples of the amide include N, N-dimethylformamide.

  Examples of the heterocyclic compound include 2-pyrrolidone.

  One or more colorants may be used. Examples of the colorant include water-soluble dyes, disperse dyes, pigments, reactive dyes, acid dyes and direct dyes. As the colorant, for example, various colorants described in “Dyeing Note 21st Edition” (Color Dyeing) are used.

  Examples of the disperse dye include C.I. I. Disperse Yellow 3, 4, 5, 7, 9, 13, 23, 24, 30, 33, 34, 42, 44, 49, 50, 51, 54, 56, 58, 60, 63, 64, 66, 68, 71, 74, 76, 79, 82, 83, 85, 86, 88, 90, 91, 93, 98, 99, 100, 104, 108, 114, 116, 118, 119, 122, 124, 126, 135, 140, 141, 149, 160, 162, 163, 164, 165, 179, 180, 182, 183, 184, 186, 192, 198, 199, 202, 204, 210, 211, 215, 216, 218, 224, 227, 231, 232; I. Disperse Orange 1, 3, 5, 7, 11, 13, 17, 20, 21, 25, 29, 30, 31, 32, 33, 37, 38, 42, 43, 44, 45, 46, 47, 48, 49, 50, 53, 54, 55, 56, 57, 58, 59, 61, 66, 71, 73, 76, 78, 80, 89, 90, 91, 93, 96, 97, 119, 127, 130, 139, 142; C.I. I. Disperse Red 1, 4, 5, 7, 11, 12, 13, 15, 17, 27, 43, 44, 50, 52, 53, 54, 55, 56, 58, 59, 60, 65, 72, 73, 74, 75, 76, 78, 81, 82, 86, 88, 90, 91, 92, 93, 96, 103, 105, 106, 107, 108, 110, 111, 113, 117, 118, 121, 122, 126, 127, 128, 131, 132, 134, 135, 137, 143, 145, 146, 151, 152, 153, 154, 157, 159, 164, 167, 169, 177, 179, 181, 183, 184, 185, 188, 189, 190, 191, 192, 200, 201, 202, 203, 205, 206, 207, 210, 221, 224, 22 5, 227, 229, 239, 240, 257, 258, 277, 278, 279, 281, 288, 298, 302, 303, 310, 311, 312, 320, 324, 328; I. Disperse Violet 1, 4, 8, 23, 26, 27, 28, 31, 33, 35, 36, 38, 40, 43, 46, 48, 50, 51, 52, 56, 57, 59, 61, 63, 69, 77; I. Disperse Green 9; C.I. I. Disperse Brown 1, 2, 4, 9, 13, 19; I. Disperse Blue 3, 7, 9, 14, 16, 19, 20, 26, 27, 35, 43, 44, 54, 55, 56, 58, 60, 62, 64, 71, 72, 73, 75, 79, 81, 82, 83, 87, 91, 93, 94, 95, 96, 102, 106, 108, 112, 113, 115, 118, 120, 122, 125, 128, 130, 139, 141, 142, 143, 146, 148, 149, 153, 154, 158, 165, 167, 171, 173, 174, 176, 181, 183, 185, 186, 187, 189, 197, 198, 200, 201, 205, 207, 211, 214, 224, 225, 257, 259, 267, 268, 270, 284, 285, 287, 288, 291, 293, 295, 297, 301, 315, 330, 333; I. Disperse Black 1, 3, 10, 24;

  Examples of the pigment include carbon black; I. Pigment Yellow 1, 3, 12, 13, 14, 16, 17, 43, 55, 74, 81, 83, 109, 110, 128; C.I. I. Pigment Orange 13, 16, 34, 43; C.I. I. Pigment Red 2, 5, 8, 12, 17, 22, 23, 41, 112, 114, 122, 123, 146, 148, 150, 166, 170, 220, 238, 245, 258; I. Pigment Violet 19, 23; C.I. I. Pigment Blue 15, 15: 1, 15: 3, 15: 5, 29; C.I. I. Pigment Green 7, 8; C.I. I. Pigment Brown 22; C.I. I. Pigment Black 1, 7; and C.I. I. Pigment White 6;

  Examples of the reactive dye include C.I. I. Reactive Yellow 2, 3, 7, 15, 17, 18, 22, 23, 24, 25, 27, 37, 39, 42, 57, 69, 76, 81, 84, 85, 86, 87, 92, 95, 102, 105, 111, 125, 135, 136, 137, 142, 143, 145, 151, 160, 161, 165, 167, 168, 175, 176, C.I. I. Reactive Orange 1, 4, 5, 7, 11, 12, 13, 15, 16, 20, 30, 35, 56, 64, 67, 69, 70, 72, 74, 82, 84, 86, 87, 91, 92, 93, 95, 107; C.I. I. Reactive Red 2, 3, 3: 1, 5, 8, 11, 21, 22, 23, 24, 28, 29, 31, 33, 35, 43, 45, 49, 55, 56, 58, 65, 66, 78, 83, 84, 106, 111, 112, 113, 114, 116, 120, 123, 124, 128, 130, 136, 141, 147, 158, 159, 171, 174, 180, 183, 184, 187, 190, 193, 194, 195, 198, 218, 220, 222, 223, 228, 235; I. Reactive Violet 1, 2, 4, 5, 6, 22, 23, 33, 36, 38; C.I. I. Reactive Blue 2, 3, 4, 7, 13, 14, 15, 19, 21, 25, 27, 28, 29, 38, 39, 41, 49, 50, 52, 63, 69, 71, 72, 77, 79, 89, 104, 109, 112, 113, 114, 116, 119, 120, 122, 137, 140, 143, 147, 160, 161, 162, 163, 168, 171, 176, 182, 184, 191, 194, 195, 198, 203, 204, 207, 209, 211, 214, 220, 221, 222, 231, 235, 236; I. Reactive Green 8, 12, 15, 19, 21; C.I. I. Reactive Brown 2, 7, 9, 10, 11, 17, 18, 19, 21, 23, 31, 37, 43, 46; and C.I. I. Reactive Black 5, 8, 13, 14, 31, 34, 39;

  Examples of the acid dye include C.I. I. Acid Yellow 1, 3, 11, 17, 18, 19, 23, 25, 36, 38, 40, 40: 1, 42, 44, 49, 59, 59: 1, 61, 65, 67, 72, 73, 79, 99, 104, 159, 169, 176, 184, 193, 200, 204, 207, 215, 219, 219: 1, 220, 230, 232, 235, 241, 242, 246; I. Acid Orange 3, 7, 8, 10, 19, 24, 51, 51S, 56, 67, 74, 80, 86, 87, 88, 89, 94, 95, 107, 108, 116, 122, 127, 140, 142, 144, 149, 152, 156, 162, 166, 168; I. Acid Red 1, 6, 8, 9, 13, 18, 27, 35, 37, 52, 54, 57, 73, 82, 88, 97, 97: 1, 106, 111, 114, 118, 119, 127, 131, 138, 143, 145, 151, 183, 195, 198, 211, 215, 217, 225, 226, 249, 251, 254, 256, 257, 260, 261, 265, 266, 274, 276, 277, 289, 296, 299, 315, 318, 336, 337, 357, 359, 361, 362, 364, 366, 399, 407, 415; I. Acid Violet 17, 19, 21, 42, 43, 47, 48, 49, 54, 66, 78, 90, 97, 102, 109, 126, C.I. I. Acid Blue 1, 7, 9, 15, 23, 25, 40, 61: 1, 62, 72, 74, 80, 83, 90, 92, 103, 104, 112, 113, 114, 120, 127, 127: 1, 128, 129, 138, 140, 142, 156, 158, 171, 182, 185, 193, 199, 201, 203, 204, 205, 207, 209, 220, 221, 224, 225, 229, 230, 239, 258, 260, 264, 277: 1, 278, 279, 280, 284, 290, 296, 298, 300, 317, 324, 333, 335, 338, 342, 350; I. Acid Green 9, 12, 16, 19, 20, 25, 27, 28, 40, 43, 56, 73, 81, 84, 104, 108, 109; C.I. I. Acid Brown 2, 4, 13, 14, 19, 28, 44, 123, 224, 226, 227, 248, 282, 283, 289, 294, 297, 298, 301, 355, 357, 413; and C.I. I. Acid Black 1, 2, 3, 24, 24: 1, 26, 31, 50, 52, 52: 1, 58, 60, 63, 63S, 107, 109, 112, 119, 132, 140, 155, 172, 187, 188, 194, 207, 222;

  Examples of the direct dye include C.I. I. Direct Yellow 8, 9, 10, 11, 12, 22, 27, 28, 39, 44, 50, 58, 86, 87, 98, 105, 106, 130, 137, 142, 147, 153; C.I. I. Direct Orange 6, 26, 27, 34, 39, 40, 46, 102, 105, 107, 118; C.I. I. Direct Red; 2, 4, 9, 23, 24, 31, 54, 62, 69, 79, 80, 81, 83, 84, 89, 95, 212, 224, 225, 226, 227, 239, 242, 243 254; C.I. I. Direct Violet 9, 35, 51, 66, 94, 95; I. Direct Blue 1, 15, 71, 76, 77, 78, 80, 86, 87, 90, 98, 106, 108, 160, 168, 189, 192, 193, 199, 200, 201, 202, 203, 218, 225, 229, 237, 244, 248, 251, 270, 273, 274, 290, 291; I. Direct Green 26, 28, 59, 80, 85; C.I. I. Direct Brown 44, 44: 1, 106, 115, 195, 209, 210, 212: 1, 222, 223; and C.I. I. Direct Black 17, 19, 22, 32, 51, 62, 108, 112, 113, 117, 118, 132, 146, 154, 159, 169;

  The content of the colorant in the ink is preferably 0.1 to 20% by mass, and more preferably 0.2 to 13% by mass.

  The Z average particle diameter of the pigment or the disperse dye is preferably 300 nm or less, or the maximum particle diameter of the pigment or the disperse dye is preferably 900 nm or less. When the Z average particle size or the maximum particle size exceeds the above range, clogging is likely to occur in an ink jet printing method in which the fine nozzles emit light, and stable ink ejection may not be possible for a long time.

  The Z average particle size or the maximum particle size can be measured using a commercially available particle size measuring device using a light scattering method, an electrophoresis method, a laser Doppler method, etc., for example, Zetasizer Nano S manufactured by Malvern. It is. The Z average particle size or maximum particle size may be adjusted by dispersing the pigment or disperse dye with a bead mill using a commercially available dispersant, classification of the pigment or disperse dye, and mixing of classified products. Is possible.

  The ink may further contain components other than those described above as long as the effects of the present embodiment can be obtained. For example, the ink may further contain a surfactant from the viewpoint of adjusting the surface tension of the ink and further stabilizing the dispersion of the colorant.

  One or more surfactants may be used. The surfactant may be any of cationic, anionic, amphoteric and nonionic surfactants.

  Examples of the cationic surfactant include aliphatic amine salts, aliphatic quaternary ammonium salts, benzalkonium salts, benzethonium chloride, pyridinium salts, and imidazolinium salts.

  Examples of the anionic surfactant include fatty acid soap, N-acyl-N-methylglycine salt, N-acyl-N-methyl-β-alanine salt, N-acyl glutamate, alkyl ether carboxylate, Acylated peptides, alkyl sulfonates, alkyl benzene sulfonates, alkyl naphthalene sulfonates, dialkyl sulfosuccinates, alkyl sulfoacetates, α-olefin sulfonates, N-acyl methyl taurines, sulfated oils, higher grades Alcohol sulfate, secondary higher alcohol sulfate, alkyl ether sulfate, secondary higher alcohol ethoxy sulfate, polyoxyethylene alkylphenyl ether sulfate, monoglyculate, fatty acid alkylolamide sulfate, alkyl ether Phosphate S Tellurium salts and alkyl phosphate ester salts are included.

  Examples of the amphoteric surfactant include carboxybetaine type, sulfobetaine type, aminocarboxylate and imidazolinium betaine.

  Examples of the nonionic surfactant include polyoxyethylene alkyl ether, polyoxyethylene secondary alcohol ether, polyoxyethylene alkylphenyl ether (eg, Emulgen 911), polyoxyethylene sterol ether, polyoxyethylene lanolin derivative , Polyoxyethylene polyoxypropylene alkyl ether (for example, Newpol PE-62), polyoxyethylene glycerin fatty acid ester, polyoxyethylene castor oil, hydrogenated castor oil, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene sorbitol fatty acid ester, Polyethylene glycol fatty acid ester, fatty acid monoglyceride, polyglycerin fatty acid ester, sorbitan fatty acid ester, propylene glycol fatty acid ester Ether, sucrose fatty acid esters, fatty acid alkanolamides, polyoxyethylene fatty acid amides, polyoxyethylene alkyl amines, alkyl amine oxides, include acetylene glycol and acetylene alcohol. “Emulgen” is a registered trademark of Kao Corporation, and “New Pole” is a registered trademark of Sanyo Chemical Industries, Ltd.

  The surfactant is preferably a nonionic surfactant or an anionic surfactant. Dodecylbenzene sulfonic acid soda, 2-ethylhexyl sulfosuccinate, alkyl naphthalene sulfonate, phenol ethylene oxide More preferred is an ethylene oxide adduct of an adduct or acetylene diol.

  The content of the surfactant in the ink can be appropriately determined from the viewpoint of improving the dispersibility of the colorant and adjusting the surface tension of the ink, and is, for example, 0.05 to 2% by mass.

  The ink may contain a preservative or a fungicide from the viewpoint of the storage stability of the ink. Examples of preservatives or fungicides include aromatic halogen compounds (eg, Preventol (CMK)), methylene dithiocyanate, halogen-containing nitrogen-sulfur compounds, and 1,2-benzisothiazolin-3-one (eg, , PROXEL (GXL). “Preventor” is a registered trademark of LANXESS, and “Proxel” is a registered trademark of Arch Corporation.

[recoding media]
The recording medium has a property of absorbing the aqueous medium (absorbability of the aqueous medium). The absorptivity refers to the property that the aqueous medium attached to the recording medium penetrates into the recording medium while spreading in both the direction along the surface of the recording medium and the thickness direction of the recording medium. The aqueous medium in which the recording medium exhibits absorbency may be the same as or different from the aqueous medium in the ink.

  The recording medium can be selected from recording media having the above-described absorbability that can be used in textile printing. The recording medium may be, for example, a sheet or a model formed of fibers, and the material of the fibers is appropriately selected as long as the effects of the present embodiment can be obtained. The recording medium is, for example, a fabric or a non-woven fabric.

  The said fabric is comprised with the fiber which can be dye | stained with a reactive dye, for example. Examples of such fabrics include cellulose fibers such as cotton, protein fibers such as silk, and blended fabrics of any of these fibers with rayon, polyurethane, polyester, or acrylic resin. The form of the fabric may be any of a woven fabric, a knitted fabric and a non-woven fabric. The thickness of the fibers constituting the fabric is preferably 10 to 100d.

  It is preferable from the viewpoint of forming a fine image that the fabric includes a pretreatment agent for preventing bleeding of the ink on the surface of the fabric. The pretreatment agent may be included only in the surface portion in the thickness direction of the fabric (recording medium), or may be included in the entire thickness direction of the fabric. The pretreatment agent contains, for example, a water-soluble polymer compound, an alkali agent, and a hydrotropic agent.

  The water-soluble polymer compound is a polymer compound that is uniformly dispersed and dissolved in water. Examples of water-soluble polymer compounds include natural gums such as guar gum and locust bean gum; starch; sodium alginate; seaweeds such as funari; plant skins such as pectic acid; celluloses such as methylcellulose, ethylcellulose, hydroxyethylcellulose, and carboxymethylcellulose Derivatives; Processed starches such as roasted starch, alpha starch, carboxymethyl starch, carboxyethyl starch, hydroxyethyl starch; processed natural gums such as shiratsu gum and roast bean gum; and alginic acid derivatives, polyvinyl alcohol, polyacrylates, etc. Synthetic glue or emulsion.

  The amount of the water-soluble polymer compound applied to the fabric is preferably 0.2 to 50% by mass, and preferably 1 to 30% by mass from the viewpoint of keeping the ink in the fabric without bleeding. More preferred.

  Examples of the alkali agent include alkali metal hydroxides such as sodium hydroxide and potassium hydroxide; amines such as mono-, di- and triethanolamine; carbonates such as sodium carbonate, potassium carbonate and sodium bicarbonate (sodium bicarbonate). Or alkali metal bicarbonate salts; organic acid metal salts such as calcium acetate and barium acetate; ammonia and ammonium compounds; and compounds that become alkaline agents under steaming or dry heat, such as sodium trichloroacetate. More preferably, the alkaline agent is sodium carbonate or sodium bicarbonate.

  The amount of the alkaline agent applied to the fabric is preferably 0.1 to 10% by mass, and preferably 0.5 to 5% by mass from the viewpoint of dyeing the ink containing reactive dye onto the fabric. More preferred. From the above viewpoint, the alkali agent is preferably contained in the fabric in advance.

  The hydrotropic agent is used from the viewpoint of increasing the image density. Examples of the hydrotropic agents include urea; and alkyl ureas such as ethylene urea, dimethyl urea, thiourea, monomethylthiourea, dimethylthiourea.

  The said pretreatment agent may further contain other components other than the component mentioned above. Examples of such other components include reduction inhibitors, preservatives and chelating agents.

  Examples of the reduction inhibitor include sodium m-nitrobenzenesulfonate. Examples of the preservative include preservatives exemplified as ink preservatives. Examples of the chelating agent include ethylenediaminetetraacetate, nitrilotriacetate, hexametaphosphate, pyrophosphate and metaphosphate.

  The application amount (squeezing rate) of the pretreatment agent and the content of the water-soluble polymer compound in the pretreatment agent are appropriately set according to, for example, the type of fabric.

  Examples of methods for applying the pretreatment agent to the fabric include a pad method, a coating method, a spray method, and an ink jet method. The pretreatment agent applied to the fabric can be heated and dried using a known heating device such as hot air, a hot plate, or a heat roller. Examples of the fabric to which the pretreatment agent is applied include fabrics having an ink receiving layer described in JP-A-62-53492, and reduction inhibitors and alkalis described in JP-B-3-46589. A fabric containing an agent.

[Humidification process]
The ink jet recording method in the present embodiment includes a step of humidifying the surface of the recording medium (humidifying step) before discharging the ink onto the recording medium. The degree of humidification of the recording medium in the humidification step can be appropriately determined from the range in which the effects of the present invention can be obtained, with the upper limit being the degree of wetting of the recording medium to the extent that the recording medium gets wet by ink ejection. For example, the wetting of the recording medium in the humidification process may be slight, or the fibers of the recording medium are only wetted by the landing of ink droplets, or the water-soluble polymer compound in the pretreatment agent May swell due to the landing of ink droplets. Thus, the degree of humidification of the recording medium may be up to an extent corresponding to the wetness of the surface due to the ejection of the ink, and the humidification step is performed on the surface of the recording medium before the ink droplets land. May be a step of moistening the surface of the recording medium to substantially the same extent as the surface of the recording medium after the ink droplets have landed.

  The humidification range in the thickness direction of the recording medium in the humidification step can be appropriately determined from the range in which the effects of the present invention can be obtained. For example, ink droplets that land on the surface of the recording medium It is possible to determine appropriately from a range including a range in which the ink reaches (permeates). The range is appropriately determined according to the type of ink, the type and thickness of the recording medium, and the like. In this way, the humidification step causes the aqueous medium to wet due to the ink droplet landing on at least the surface of the recording medium before the ink droplet landing.

  The humidification step can be performed by supplying the aqueous medium to the surface of the recording medium. The aqueous medium may be the same as or different from the aqueous medium of the ink used. The aqueous medium in the humidification step is supplied to the surface of the recording medium as, for example, a gas with adjusted humidity such as humidified air or fine particles of an aqueous medium such as nanomist. Among these, humidified air is preferable from the viewpoint of uniformly humidifying the surface of the recording medium and from the viewpoint of being easily and inexpensively generated.

  More specifically, in the case where air humidified with an aqueous medium such as water (humidified air) is used in the humidifying step, if the relative humidity of the humidified air is too low, recording by landing of ink droplets is performed. Reproduction of the surface of the medium may be insufficient, and if it is too high, droplets due to condensation may be supplied to the recording medium and excessively wet the surface of the recording medium. From such a viewpoint, the relative humidity of the humidified air is preferably 50 to 80%, and more preferably 55 to 75%.

  Further, if the temperature of the humidified air is too low, the humidity of the humidified air becomes insufficient, and the reproduction of the wetness of the surface of the recording medium due to the landing of ink droplets may be insufficient. In addition, drying of the surface of the recording medium that has been moderately moistened may be promoted, and the wetting of the surface of the recording medium due to ink droplet landing may be insufficient. From such a viewpoint, the temperature of the humidified air is preferably 20 to 40 ° C, and more preferably 20 to 30 ° C.

  Furthermore, if the air volume of the humidified air is too small, reproduction of the surface of the recording medium due to the landing of ink droplets may be insufficient, and if too large, the shape of the surface of the recording medium may be disturbed. Ink landing may be disturbed, or the recording medium may be excessively moistened to promote ink penetration into the recording medium, resulting in insufficient image density on the surface of the recording medium. From such a viewpoint, the air volume of the humidified air is preferably 0.2 to 5 m / sec, and more preferably 0.5 to 3 m / sec.

  The humidification step may be performed collectively before all ink is ejected, but from the viewpoint of equalizing the spread of ink in the ink droplets landed on the surface of the recording medium with all ink ejected. It is preferable to carry out each ink type individually. The humidification step for each discharge of various inks can be performed, for example, by disposing a humidifier for performing the humidification step corresponding to an ink jet head of various inks. Examples of the apparatus include a nozzle for spraying humidified air or nano mist onto the recording medium.

[Other processes]
In the ink jet recording method in the present embodiment, ink is ejected onto the surface of the recording medium humidified in the humidification step. The ink is ejected while the wetness of the surface of the recording medium is substantially maintained. For example, ink is ejected immediately after the humidification step.

  The ink jet recording method in the present embodiment may further include other steps other than the humidification step as long as the effects of the present embodiment can be obtained. Examples of the other steps include a pretreatment step of pretreating the recording medium with the pretreatment agent, a preliminary drying step of drying the recording medium after the ink has been ejected, and the ink ejected onto the recording medium as the recording medium. A coloring process for dyeing the ink in the ink to express the original hue of the ink, a cleaning process for cleaning the recording medium after the coloring process and removing the pretreatment agent and excess ink from the recording medium, and after the cleaning process A drying step of drying the recording medium. The above-mentioned other steps can be performed by a known method in textile printing using an ink jet recording method.

[Inkjet recording apparatus]
The ink jet recording method of the present embodiment can be performed by, for example, a known one-pass ink jet recording apparatus provided with the humidifier. FIG. 1 is a diagram schematically showing an example of the configuration of the ink jet recording apparatus according to the present embodiment. As shown in FIG. 1, the inkjet recording apparatus 10 transports four inkjet head units 11 corresponding to yellow, magenta, cyan, and black colors and a fabric 100 as a recording medium in succession. A belt. An arrow X in FIG. 1 indicates the conveyance direction of the fabric 100.

  FIG. 2A is a diagram schematically illustrating the configuration of the inkjet head unit 11 when viewed in plan, and FIG. 2B is a diagram schematically illustrating the configuration of the inkjet head unit 11 as viewed from the side. FIG. 2C is a diagram schematically illustrating the configuration of the inkjet head unit 11 when viewed from the front. As shown in FIGS. 2A to 2C, each of the inkjet head units 11 includes a plurality of inkjet heads 111 arranged in two rows along the width direction of the fabric indicated by the arrow Y, and humidified air to the fabric 100. And a blowout port 112 for blowing out. All of the inkjet heads 111 are fixed on the conveyance belt.

  The ink jet heads 111 are arranged so as to partially overlap each other in the Y direction, and are arranged without a gap as a whole. The outlet 112 is a duct having an elongated rectangular opening that extends from the center in the Y direction along the Y direction, and corresponds to a humidifier. The outlet 112 is disposed upstream of the inkjet head 111 in the X direction and extends to a range at least overlapping with all the inkjet heads 111 in the Y direction. The inkjet head 111 has, for example, an ink chamber (not shown), a pressure chamber, and a nozzle, and is connected to an ink tank that stores ink of each color. The outlet 112 is connected to a humidifier (not shown), for example.

  As shown in FIG. 1, the conveyor belt is an endless adhesive belt 21, a support roll 22 and a conveyor roll 23 that support the adhesive belt 21, and a position that sandwiches the conveyor roll 23 and the adhesive belt 21. And a nip roll 24 arranged. The adhesive belt 21 has adhesiveness on the surface on which the fabric 100 is placed. The conveyance roll 23 is configured to be driven to rotate freely, and the support roll 22 is arranged to be rotatable. Further, the nip roll 24 is disposed so as to be able to approach and separate from the transport roll 23.

  When the transport belt is driven, the fabric 100 is transported continuously in the X direction. The fabric 100 is pre-treated by applying a pre-treatment liquid and drying it.

  Next, the fabric 100 is supplied with humidified air of, for example, 25 ° C. and 70 RH% at 2 m / second from the outlet 112 of the inkjet head unit 11 on the more upstream side. By supplying the humidified air, the surface of the fabric 100 is moistened to the same extent as when ink droplets land. Then, the first ink is ejected from the inkjet head 111 to the wetted portion of the fabric 100. Similar humidification and second and subsequent ink ejections are also performed in the inkjet head 111 on the downstream side.

  In this way, the ink of the desired color is ejected to the fabric 100 only once through the inkjet head unit 11, and a desired image is formed on the surface of the fabric 100. The fabric 100 on which an image is formed as described above is subjected to the above-described steps of preheating, color development, washing, and drying.

[Action, effect]
When an image is formed on a fabric by the one-pass ink jet recording method as described above, a fine image is formed in which the edge of the color of ink ejected later does not occur. The reason is considered as follows.

  FIG. 3A is a diagram schematically illustrating a state in which the first ink penetrates into the fabric. FIG. 3B is a diagram illustrating a state in which the fabric is humidified immediately before the first ink is ejected and the first ink is ejected. FIG. 3C is a diagram schematically illustrating how the second ink penetrates into the fabric when the second ink is further discharged. FIG. 3C illustrates the first ink without being humidified before discharging the first ink. It is a figure which shows typically a mode that 2nd ink osmose | permeates a fabric when 2nd ink is further discharged to the fabric after ink was discharged.

  When ink (for example, cyan ink) is ejected onto the fabric, as shown in FIG. 3A, the ink is placed in both the direction along the surface of the fabric and the depth direction, centering on the position where the ink droplets land. While spreading, it penetrates into the fabric. Here, when the fabric is dry, the ink permeates while being absorbed by the water-soluble polymer in the pretreatment agent attached to the fibers of the fabric. When the fabric is wet, the ink penetrates into the fabric in which the water-soluble polymer is already swollen, so that the ink is more in the thickness direction of the fabric than when the fabric is dry. It is more difficult to penetrate and spread more easily in the direction along the surface.

  When the cyan ink is ejected, if the fabric is pre-moistened to the same extent as the wetness of the ink droplets landing, the cyan ink spreads in the same manner as it spreads on the fabric from which ink has already been ejected. To penetrate.

  In this case, when the yellow ink is ejected to the same position on the fabric after the cyan ink, as shown in FIG. 3B, the yellow ink penetrates the fabric while spreading in the same manner as the cyan ink. This is because the state of the fabric portion when cyan ink permeates (for example, the degree of swelling of the water-soluble polymer) is substantially the same as the state of the fabric portion when yellow ink penetrates. Conceivable. As a result, the yellow ink penetrates into substantially the same portion of the fabric where the cyan ink penetrates, and green dots are formed.

  On the other hand, when the fabric is not moistened (dried) as described above when cyan ink is ejected, the yellow ink to be ejected next is the fabric in which the water-soluble polymer is not swollen. Compared to cyan ink that has permeated while swelling the polymer, it becomes less likely to penetrate the fabric. This is probably because the flow path through which the yellow ink permeates becomes narrower as the water-soluble polymer swells than the cyan ink. As a result, as shown in FIG. 3C, the yellow ink penetrates to the outside of the green dot more widely in the direction along the surface of the fabric than the portion where the cyan ink penetrates. For this reason, a yellow border discharged later is formed on the image formed on the surface of the fabric (arrow in FIG. 3C).

  On the other hand, if the fabric is excessively dampened during discharge of cyan ink (for example, wet enough to contain liquid), both cyan ink and yellow ink penetrate the fabric from the landing position to a wider range. To do. Since the volume of ink droplets is limited, if the ink penetrates further in the direction along the surface of the fabric or in the thickness direction, the hue of the ink may be thinned and may not be sufficiently expressed on the surface of the fabric. . In addition, since the ink spreads too much in this way, the boundary between different hues in the image formed on the surface of the fabric may become unclear. As a result, the fineness of the image may be further reduced.

  Here, in comparison with a scanning-type inkjet recording apparatus in which the inkjet head ejects ink while scanning a plurality of times, in the inkjet recording apparatus, the inkjet head moves left and right (for example, in the Y direction in FIG. 2A), and the unit The amount of ink ejected per hour is generally smaller than that of a one-pass inkjet recording apparatus. For this reason, in the image formation by the scanning ink jet recording apparatus, the ink is easily dried and the humidity on the recording medium is easily stabilized as compared with the image formation by the one-pass ink jet recording apparatus. Therefore, the environment around the recording medium at the time of discharging the first drop and that at the time of discharging the second drop does not change greatly, and does not substantially affect the spread of ink landed on the recording medium.

  Further, in a scan type ink jet recording apparatus, an image is usually formed by an interleave method. For this reason, for example, the case where the cyan ink lands on the position where the yellow ink lands and the case where the yellow ink lands on the position where the cyan ink lands are randomly and approximately the same for the entire recording medium (fabric). Occurs at a rate of. Therefore, even if the dot diameter of the yellow ink landed at the same position is different from the dot diameter of the cyan ink, the portions with different landing orders are randomly but almost evenly distributed on the portion of the recording medium on which the image is formed. Therefore, an image with a little uncomfortable feeling is formed as a whole.

  On the other hand, in the image formation by the one-pass type ink jet recording apparatus, the ink jet head does not move, and the amount of ink discharged per unit time is generally larger than that of the scan type ink jet recording apparatus. For this reason, the humidity near the inkjet tends to be high. Therefore, the environment around the recording medium at the time of discharging the first drop and that at the time of discharging the second drop are greatly different, and the spread of the ink landed on the recording medium is also different.

  In the one-pass type ink jet recording apparatus, the ink jet head is fixed, and usually the ink ejection order is fixed (for example, yellow ink first, then cyan ink, etc.). For this reason, even if there is a slight difference between the dot diameter of the yellow ink and the dot diameter of the cyan ink, a sense of discomfort due to the difference is emphasized in the entire formed image. Will be formed.

  These are problems peculiar to image formation by a one-pass ink jet recording apparatus, and according to the present invention, even in image formation by a one-pass ink jet recording apparatus, the difference in dot diameter due to the landing order is substantially different. Therefore, this unique problem is solved.

  As is apparent from the above description, the ink jet recording method according to the present embodiment uses two or more kinds of inks containing an aqueous medium and a colorant on the surface of the recording medium having the absorptivity of the aqueous medium. An ink jet recording method for forming an image by ejecting the ink jet head on the recording medium once, wherein the recording medium is a fabric or a non-woven fabric, and the ink jet recording method includes the ink described above. A step of humidifying the surface of the recording medium before discharging to the recording medium is included. Therefore, even when an image is formed on an absorbent recording medium by the one-pass inkjet recording method, a fine image can be formed.

  In the humidification step, it is more effective to humidify the surface with air having a relative humidity of 50 to 80% from the viewpoint of appropriately adjusting the wetness of the recording medium.

  Further, in the humidification step, humidifying the surface before each type of ink is discharged from the viewpoint of aligning the degree of penetration of each ink into the recording medium and forming a higher-definition image. Even more effective.

  In addition, the inkjet recording method can be applied to textile printing, and the recording medium includes a pretreatment agent for preventing bleeding of the ink on the surface, so that a high-definition image can be produced on a fabric with high productivity. From the viewpoint of forming with, it is even more effective.

  Further, the fact that the ink contains glycols and the content of the glycols in the ink is 15 to 60% by mass is controlled after excessive swelling of the water-soluble polymer of the fabric is discharged later. From the viewpoint of facilitating penetration of the ink into the fabric, and as a result, from the viewpoint of forming a higher definition image, the content of the glycols in the ink is 30 to 60% by mass. It is even more effective from the above viewpoint.

  In addition, the ink jet recording apparatus according to the present embodiment discharges ink while moving in one direction relative to the recording medium, and forms a desired image with a single scan on the recording medium. A one-pass type ink jet recording apparatus, comprising: an ink jet for holding the recording medium; and a transport mechanism for moving the ink jet in one direction relative to the recording medium. Is a fabric or a non-woven fabric, and further includes a humidifying device for humidifying the surface of the recording medium in the front direction in the scanning direction of the inkjet head. Therefore, even when an image is formed on an absorbent recording medium by the one-pass inkjet recording method, a fine image can be formed.

  The inkjet head has a plurality of nozzle groups for ejecting a plurality of colors of ink, each of the nozzle groups protrudes a different color of ink, and the humidifying device has a plurality of nozzles corresponding to each of the nozzle groups. Arranged and arranged in front of the nozzle group in the scanning direction is to spread the ink of each color while keeping the wetness of the fabric before the ink is ejected constant between the inks of each color. It is even more effective from the viewpoint of aligning the methods.

[Modification]
In addition, although the above-mentioned inkjet recording device has a humidifier in each inkjet head, you may have a humidifier in an inkjet head unit unit. For example, as shown in FIG. 4, the ink jet recording apparatus is disposed on the upstream side (the opposite side to the X direction) of the ink jet head unit 41 and the individual ink jet head units 41 in the direction of the cloth sign. A blowout port 412 may be included. The ink jet head unit 41 is the same as the ink jet head unit 11 except that it does not have the air outlet 112, and the air outlet 412 is the same as the air outlet 112 except that it is arranged outside the ink jet head unit. The ink jet recording apparatus shown in FIG. 4 has the same effect as the ink jet recording apparatus shown in FIG. 1, and in addition, it is easier to modify an existing ink jet recording apparatus to be applicable to the present invention. It is preferable because it exists.

  Alternatively, the inkjet recording apparatus may have a humidifier arranged one upstream of the plurality of inkjet heads. Further, the humidifying device in the ink jet recording apparatus described above may be, for example, a spraying device that supplies mist to the cloth other than the blowout port.

  In the above-described ink jet recording apparatus, the fabric is moved in the X direction with respect to the ink jet head, but the ink jet head may be moved in a direction opposite to the X direction. In this case, the fabric may be fixed, or may move in the X direction or the opposite direction in synchronization with the movement of the inkjet head.

  In the following, the invention will be described in more detail with reference to examples. The scope of the invention is not construed as being limited by the description of the examples.

[Preparation of cyan ink]
(Preparation of dye dispersion A-1)
As a dispersant, 15 parts by mass of DISPERBYK-190 (comb block polymer dispersant, solid content 40% by mass, manufactured by Big Chemie) was added to 60 parts by mass of ion-exchanged water, and 5 parts by mass of dipropylene glycol propyl ether was mixed therein. In this solution, the disperse dye C.I. I. Disperse Blue-60 was added in an amount of 20 parts by mass, premixed, and then dispersed using a sand grinder filled with 50% by volume of 0.5 mm zirconia beads to obtain a dye dispersion A-1 having a dye solid content of 20% by mass. Got. It was 0.15 micrometer when the Z average particle diameter of the dispersion particle of obtained dye dispersion liquid A-1 was measured with the dynamic light-scattering-method particle size distribution analyzer Zetasizer Nano S (made by Malvern).

(Cyan ink production)
27.6 parts by mass of ion-exchanged water, 40 parts by mass of ethylene glycol, 7 parts by mass of glycerin, 0.2 parts by mass of proxel GXL (an antifungal agent, Lonza), and KF-351A (surfactant Shin-Etsu Chemical) 25 parts by mass of Dye Dispersion A-1 was added to a mixture obtained by adding 0.2 parts by mass of (made by Co., Ltd.) and stirred, and then filtered through a 1 μm filter to obtain cyan ink 1.

  Further, cyan ink 2 was obtained in the same manner as in the production of cyan ink 1 except that the addition amount of ion exchange water was changed to 57.6 parts by mass and the addition amount of ethylene glycol was changed to 10 parts by mass.

[Preparation of yellow ink]
(Preparation of dye dispersion A-2)
In the preparation of the dye dispersion liquid A-1, the disperse dye is C.I. I. Dye dispersion A-2 was obtained in the same manner except that it was changed to Disperse Yellow-114. The Z average particle diameter of the dispersed particles of the obtained dye dispersion A-2 was 0.17 μm.

(Production of yellow ink)
A yellow ink 1 was obtained in the same manner except that the dye dispersion A-1 was changed to the dye dispersion A-2 in the production of the cyan ink. A yellow ink 2 was obtained in the same manner as in the preparation of the yellow ink 1 except that the addition amount of ion exchange water was changed to 57.6 parts by mass and the addition amount of ethylene glycol was changed to 10 parts by mass.

[Preparation of fabric]
As a pretreatment, a polyester cloth having a thread thickness of 50d was immersed in an aqueous carboxymethyl cellulose solution, squeezed and dried.

[Example 1]
An outlet for supplying humidified air is arranged on the upstream side in the fabric supply direction of each color inkjet head of a commercially available one-pass printing inkjet recording apparatus so as to overlap the inkjet head in the width direction of the fabric, A one-pass type testing machine as shown in FIG. 1 was prepared.

Then, using the cyan ink 1 and yellow ink 1 described above together with the test device, a thin line of 0.5% cyan and 75% yellow was printed on a cloth, pre-dried, and then HT steam at 175 ° C. for 10 minutes. After the treatment, it was washed with water, reduced and washed with a 0.2% hydrosulfite aqueous solution at 80 ° C., and then sufficiently washed with water and dried. The color blur of the formed fine line was observed visually and with a 100 × optical microscope, and evaluated according to the following criteria. The “color blur” is a difference in blur between cyan and yellow colors.
A: No color blur is observed by visual observation or observation by an optical microscope. B: Although blur is hardly visually recognized by visual observation, it is visible by observation by an optical microscope. C: Blur is visually recognized by visual observation.

In addition, a 10 × 10 cm rectangular solid image was created on the fabric in the same manner as described above. This image was compared with an image (rectangular image created in Comparative Example 1 below) prepared in the same manner as described above except that humidification was not performed, and evaluated according to the following criteria.
A: It is recognized that there is no difference in image density from that without humidification. B: Although it looks the same as that without humidification, it is recognized that the image density is slightly lower when compared in detail. Obviously the image density is low

[Example 2]
An image was formed on the fabric and the formed image was evaluated in the same manner as in Example 1 except that cyan ink 2 and yellow ink 2 were used in place of cyan ink 1 and yellow ink 1.

[Comparative Example 1]
A fine line and a rectangular image were formed on the cloth in the same manner as in Example 1 except that the cloth was not humidified before ink ejection, and the fine line and the image were evaluated. Note that the rectangular image in Comparative Example 1 is an image serving as a reference in the sensory test of image density.

[Comparative Example 2]
Instead of humidifying the fabric before ink ejection, as described in Patent Document 1, a thin line and a rectangular image are obtained in the same manner as in Example 1 except that a liquid composition (penetrating liquid) is attached to the fabric. Was formed on a fabric, and the fine line and the image were evaluated.

[Comparative Example 3]
A blowout port for supplying humidified air to the tip side (that is, both sides of the inkjet head) in the scanning direction (the direction crossing the supply direction of the fabric) of each color inkjet head of a commercially available inkjet recording apparatus for textile printing, A scanning test machine was prepared so as to overlap the inkjet head in the scanning direction. The “scan method” means an ink jet recording method in which ink is ejected onto a cloth while reciprocating the ink jet head in a direction crossing the cloth conveying direction while the cloth is being conveyed.

  Except for using the comparative tester, fine lines and rectangular images were formed on the fabric in the same manner as in Example 1, and the thin lines and images were evaluated.

[Comparative Example 4]
A thin line and a rectangular image were formed on the cloth in the same manner as in Comparative Example 3 except that the cloth was not humidified before ink ejection, and the thin line and the image were evaluated.

  The evaluation results of Example 1 and Comparative Examples 1 to 4 are shown in Table 1.

  As is apparent from Examples 1 and 2, the fabric immediately before ink ejection was humidified with humidified air to sufficiently prevent color blurring of fine lines and obtain a sufficient image density. This is because, before the first ink (cyan ink) is ejected, a state similar to the penetration of the ink is formed on the surface of the fabric by humidification with humidified air, and the first cyan ink is the second yellow ink. Similarly, since the ink penetrated into the fabric, it is considered that any ink overprinted in the one-pass format penetrated into substantially the same area of the fabric.

  Further, in Example 1, color bleeding is further suppressed as compared to Example 2. From the above, it can be seen that it is more effective from the viewpoint of suppressing color bleeding that the concentration of glycols in the ink is 15% by mass or more.

  On the other hand, as apparent from Comparative Example 1, color blur occurred when humidification was not performed immediately before the cyan ink was discharged. This is presumably because the degree of penetration of the first cyan ink into the fabric differs from the degree of penetration of the second yellow ink into the fabric, and the yellow ink diffused in the direction along the surface of the fabric.

  Further, as is clear from Comparative Example 2, when the humidification with the penetrating liquid was performed, the image density became insufficient. This is presumably because the fabric was excessively wet and both the cyan ink and the yellow ink were excessively permeated into the fabric and the hue of the ink was thinned.

  As is clear from Comparative Examples 3 and 4, in the scan method, color blur was prevented and the image density was sufficient regardless of whether the fabric was humidified immediately before the first ink ejection. This is because, in the scan method, the type of ink that lands first is irregularly changed, and other ink can then be ejected to the landed portion of the first ink, resulting in color bleeding in dot units. However, since this color blur is randomly generated in the fine line, it is considered that the color blur is not observed as the fine line. In addition, it is considered that a sufficient image density is expressed because the ink does not permeate excessively in the fabric.

  This application claims the priority based on Japanese Patent Application No. 2014-096795 of an application on May 8, 2014. The contents described in the application specification and the drawings are all incorporated herein.

  The present invention can form a high-definition image by a highly productive one-pass method even for a recording medium having an absorptivity of an aqueous medium. Therefore, the present invention is expected to contribute to further development of higher speed and higher definition ink jet printing.

DESCRIPTION OF SYMBOLS 10 Inkjet recording device 11, 41 Inkjet head unit 21 Adhesive belt 22 Support roll 23 Conveyance roll 24 Nip roll 100 Fabric 111 Inkjet head 112, 412 Blowout X X arrow indicating fabric conveyance direction Y Arrow indicating fabric width direction

Claims (7)

Two or more kinds of inks containing an aqueous medium and a colorant are ejected onto the surface of the recording medium having the absorptivity of the aqueous medium by a single scan on the recording medium of an ink-jet head to form an image. A one-pass inkjet recording method to be formed,
The recording medium is a fabric or a nonwoven fabric,
The inkjet recording method includes a step of humidifying the surface of the recording medium before discharging the ink onto the recording medium.
Inkjet recording method.   The ink jet recording method according to claim 1, wherein the surface is humidified with air having a relative humidity of 50 to 80%.   The ink jet recording method according to claim 1, wherein the surface is humidified before each type of ink is ejected. The ink contains glycols,
The content of the glycols in the ink is 15 to 60% by mass.
The ink jet recording method according to claim 1. An ink jet for discharging ink while moving in one direction relative to the recording medium, and forming an intended image with a single scan on the recording medium, and holding the recording medium and holding the recording medium A one-pass inkjet recording apparatus having a transport mechanism for moving the inkjet in one direction relative to the recording medium,
The recording medium is a fabric or a nonwoven fabric,
An inkjet recording apparatus, further comprising a humidifier for humidifying a surface of a portion of the recording medium in a scanning direction of the inkjet head. The inkjet head has a plurality of nozzle groups for discharging a plurality of colors of ink,
Each of the nozzle groups protrudes different color inks,
A plurality of the humidifiers are arranged corresponding to each of the nozzle groups, and arranged in front of the nozzle groups in the scanning direction.
The ink jet recording apparatus according to claim 5.   The inkjet recording apparatus according to claim 5 or 6, wherein the humidifier includes a nozzle for supplying air having a relative humidity of 50 to 80% to a surface of the recording medium.

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