JP5564762B2 - Inkjet printing method - Google Patents

Description

  The present invention relates to an inkjet printing method, and more particularly to an inkjet printing method with less ink mixing.

  When an image is formed on a fabric by directly discharging conventional water-based ink onto the fabric, bleeding occurs. For this reason, the pre-processing which usually provided the component which consists of water-soluble polymers, such as CMC and alginate Na, to the fabric was performed (for example, refer patent document 1). The water-soluble polymer in the fabric has acted as an ink retaining component (absorbing layer) to prevent bleeding. However, the cost and time required for the fabric pretreatment are problems. In addition, since the water-soluble polymer in the fabric is removed by washing after dyeing, the laundry drainage may require special treatment.

Accordingly, there has been a strong demand for the development of a non-bleeding ink jet printing method using a water-based ink on a fabric without pretreatment.
JP-A-6-116880

  An object of the present invention is to provide an ink-jet printing method that can reduce bleeding and prevent ink mixing, achieve both high color density and injection stability, and can cope with changes in the thickness and type of cloth.

  The above object of the present invention can be achieved by the following configuration.

1. An inkjet printing method including a step of discharging a water-based ink containing at least a reactive dye, an organic solvent, and water to form an image on a heated fabric, and then fixing the reactive dye to the fabric by a heating step. In the water-based ink, the total amount of components other than water and organic solvent is 10% by mass or more and less than 20% by mass, the surface tension is 20 mN / m or more and 35 mN / m or less, and the fabric contains an alkaline component. The content of the ink-holding component containing water-soluble polymer as a main component is 100 mg / m ² or less, and the surface temperature of the fabric is discharged from 30 ° C. to 70 ° C. while discharging the aqueous ink on the fabric. An ink-jet printing method for forming an image on a substrate.
2. 2. The inkjet printing method according to 1 above, wherein the water-based ink has a total amount of components other than water and organic solvent of 10% by mass or more and less than 15% by mass.
3. 3. The inkjet printing method according to 1 or 2 above, which comprises a step of imparting alkali before the heating step.
4). 4. The ink-jet printing method according to any one of 1 to 3 above, wherein the water-based ink contains a silicone-based activator or a fluorine-based activator.
5. 5. The inkjet printing method according to any one of 1 to 4, wherein the water-based ink contains a water-soluble polymer.

  According to the present invention, it is possible to provide an ink-jet printing method capable of reducing bleeding and preventing ink mixing, achieving both high color density and injection stability, and adapting to changes in the thickness and type of cloth.

  The present invention will be described in more detail. In general, a fabric without pre-treatment is likely to bleed along fibers, so bleed suppression is required. In order to suppress the bleeding, the ink is quickly penetrated into the fiber to prevent the ink from being coalesced on the surface of the fabric and to prevent the ink from mixing inside the fiber. It has been found that it is necessary to lower the properties, and the present invention has been achieved.

  In order to allow water-based ink (hereinafter simply referred to as ink) to rapidly penetrate into the fiber, it is important to control the surface tension of the ink. If the surface tension is higher than 35 mN / m, bleeding cannot be prevented, and if it is lower than 20 mN / m, the penetration is too fast and bleeding and color mixing occur along the fiber. Therefore, control is required to be 20 to 35 mN / m.

  In order to prevent ink from mixing inside the fiber and to increase the ink viscosity and decrease the fluidity, it is effective to print while heating the fabric. A higher heating temperature is preferable for suppressing bleeding, but if it is too high, the color density after the step of fixing the reactive dye to the fabric by the subsequent heating step does not increase. If the temperature is too high, the ink will thicken too much in the process of penetrating into the fiber, but the ink is not sufficiently penetrated, but the dye is not sufficiently fixed to the fabric because the dye is localized near the fabric surface, Further, the dye density is too high, and the color density may not be increased due to the interaction between the dyes, or the reactive dye may be partially hydrolyzed. Also, the higher the heating temperature, the higher the speed of thickening due to drying. However, it is not realistic because ink drying at the head progresses and ejection failure occurs.

  Therefore, the ink bleeding effect is not achieved until the total amount of components other than water and organic solvent in the water-based ink is 6% by mass or more and less than 20% by mass and the fabric is heated at the same time and the surface tension of the ink is controlled. It was found that simultaneous suppression and suppression of color density reduction can be achieved simultaneously.

  The configuration of the present invention will be described in detail below.

(Reactive dye)
In the aqueous ink of the present invention, the total amount of components other than water and organic solvent in the ink is 10% by mass or more and less than 20% by mass, and the reactive dye is preferably 5% or more and less than 20% by mass. The reactive dye is preferably 5% or more and less than 15% by mass. In particular, the reactive dye in the same color ink having the highest dye concentration is preferably 10% or more and less than 15%.

  Examples of reactive dyes that can be used in the present invention include azo dyes, methine dyes, azomethine dyes, xanthene dyes, quinone dyes, phthalocyanine dyes, triphenylmethane dyes, and diphenylmethane dyes.

  Specific examples of dyes applicable to the ink jet ink of the present invention are listed below, but the present invention is not limited to these exemplified dyes.

C. 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. 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. 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, 226, 228, 235,
C. I. Reactive Violet 1, 2, 4, 5, 6, 22, 23, 33, 36, 38,
C. 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,
C. I. Reactive Green 8, 12, 15, 19, 21,
C. I. Reactive Brown 2,7,9,10,11,17,18,19,21,23,31,37,43,46,
C. I. Reactive Black 5, 8, 13, 14, 31, 34, 39 etc. are mentioned.

(Organic solvent)
The water-based ink of the present invention can contain the organic solvents of the specific examples shown below.

  Alcohols (for example, methanol, ethanol, propanol, isopropanol, butanol, isobutanol, sec-butanol, t-butanol), polyhydric alcohols (for example, ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, propylene glycol, di-) Propylene glycol, polypropylene glycol, butylene glycol, hexanediol, pentanediol, glycerin, hexanetriol, thiodiglycol), amines (eg, ethanolamine, diethanolamine, triethanolamine, N-methyldiethanolamine, N-ethyldiethanolamine, morpholine) , N-ethylmorpholine, ethylenediamine, diethylenediamine, triethylenetet Amine, tetraethylenepentamine, polyethyleneimine, pentamethyldiethylenetriamine, tetramethylpropylenediamine), amides (eg, formamide, N, N-dimethylformamide, N, N-dimethylacetamide, etc.), heterocyclic rings (eg, 2 -Pyrrolidone, N-methyl-2-pyrrolidone, cyclohexyl pyrrolidone, 2-oxazolidone, 1,3-dimethyl-2-imidazolidinone), sulfoxides (for example, dimethyl sulfoxide) and the like.

(surface tension)
The water-based ink of the present invention has a surface tension of 20 mN / m or more and 35 mN / m or less. Even if it is larger than 35 mN / m or less than 20 mN / m, bleeding on the fabric occurs. If it is greater than 35 mN / m, the ink is blurred due to coalescence on the fabric, and if it is less than 20 mN / m, the ink seems to spread along the fibers while penetrating the fabric.

  In order to be applicable to a wide range of fabrics, it is more preferably 25 mN / m or more and 35 mN / m or less.

  The method for adjusting the surface tension of the water-based ink to the above range can be adjusted by using an appropriate amount of a low surface tension solvent and an appropriate amount of an activator. In particular, it is preferable to adjust by using appropriate amounts of both a low surface tension solvent and an activator.

  The low surface tension solvent preferably contains 10 to 30% by mass of a solvent having a surface tension of 25 to 40 mN / m. More preferably, it is an embodiment containing 10 to 30% by mass of a solvent having a surface tension of 25 to 35 mN / m.

  Examples of the solvent having a surface tension of 25 to 40 mN / m include water-soluble organic solvents such as glycol ether and 1,2-alkanediol.

  The solvent may be contained alone in an amount of 10 to 30% by mass, or a plurality thereof may be used and the total amount thereof may be contained in an amount of 10 to 30% by mass.

  The method for measuring surface tension is described in general interface chemistry and colloid chemistry reference books. For example, New Experimental Chemistry Course Vol. 18 (Interface and Colloid), The Chemical Society of Japan, Maruzen Co., Ltd. Issue: P.A. 68-117 can be referred to, and specifically, it can be determined by using a ring method (Dunoi method) or a vertical plate method (Wilhelmy method).

  In the measurement of the surface tension of the present invention, the surface tension meter CBVP type A-3 type (Kyowa Science Co., Ltd.) was used.

  Specifically, the surface tension of each organic solvent is shown. As the glycol ether (each numerical value is mN / m), ethylene glycol monoethyl ether (28.2), ethylene glycol monobutyl ether (27.4), diethylene glycol mono Ethyl ether (31.8), diethylene glycol monobutyl ether (33.6), triethylene glycol monobutyl ether (32.1), propylene glycol monopropyl ether (25.9), dipropylene glycol monomethyl ether (28.8), And tripropylene glycol monomethyl ether (30.0).

  Examples of the 1,2-alkanediol include 1,2-butanediol, 1,2-pentanediol, 1,2-hexanediol (28.1), 1,2-heptanediol, and the like.

(Active agent)
In the aqueous ink of the present invention, various surfactants can be used as the activator. The surfactant that can be used in the present invention is not particularly limited, but examples thereof include anionic surfactants such as dialkyl sulfosuccinates, alkyl naphthalene sulfonates, fatty acid salts, polyoxyethylene alkyl ethers, polyoxy Nonionic surfactants such as ethylene alkylallyl ethers, acetylene glycols, polyoxyethylene / polyoxypropylene block copolymers, and cationic surfactants such as alkylamine salts and quaternary ammonium salts. In particular, an anionic surfactant and a nonionic surfactant can be preferably used.

  In order to control the surface tension of the water-based ink of the present invention to 20 mN / m or more and 35 mN / m or less, it is particularly preferable to contain a silicone-based activator or a fluorine-based activator.

(Silicone-based activator or fluorine-based activator)
The silicone-based surfactant is preferably a polyether-modified polysiloxane compound, and examples thereof include KF-351A and KF-642 manufactured by Shin-Etsu Chemical Co., and BYK345, BYK347, and BYK348 manufactured by Big Chemie.

  The fluorine-based surfactant means a compound in which a part or all of the surfactant is substituted with fluorine in place of hydrogen bonded to carbon of the hydrophobic group of a normal surfactant. Of these, those having a perfluoroalkyl group in the molecule are preferred.

  Among the fluorine-based surfactants, certain types are traded under the trade name Megafac F from Dainippon Ink & Chemicals, and Surflon from Asahi Glass, Minnesota Mining and Under the trade name Fluorad FC from Manufacturing Company, under the trade name Monflor from Imperial Chemical Industry, and Zonyls from EI Dupont Nemeras & Company. It is commercially available under the trade name and also under the trade name Licobet VPF from Farbeberke Hoechst.

  Examples of nonionic fluorosurfactants include Megafax 144D manufactured by Dainippon Ink and Surflon S-141 and 145 manufactured by Asahi Glass Co., and amphoteric fluorosurfactants. Examples of the agent include Surflon S-131 and 132 manufactured by Asahi Glass Co., Ltd.

(Total amount of components other than water and organic solvent in water-based ink)
In order to prevent mixing of the inks inside the fiber, it is important to increase the ink viscosity and decrease the fluidity, and it is effective to print while heating the fabric. A higher heating temperature is preferable for suppressing bleeding, but if it is too high, the color density after the step of fixing the reactive dye to the fabric by the subsequent heating step does not increase. If the temperature is too high, the ink will thicken too much in the process of penetrating into the fiber, but the ink is not sufficiently penetrated, but the dye is not sufficiently fixed to the fabric because the dye is localized near the fabric surface, Further, the dye density is too high, and the color density may not be increased due to the interaction between the dyes, or the reactive dye may be partially hydrolyzed. Also, the higher the heating temperature, the higher the speed of thickening due to drying. However, it is not realistic because ink drying at the head progresses and ejection failure occurs. Therefore, by adjusting the total amount of components other than water and organic solvent in the water-based ink to 10% by mass or more and less than 20% by mass, the dry thickening when the fabric is heated proceeds appropriately to achieve both suppression of bleeding and high color development. It is preferable.

  Components other than water and organic solvents in water-based inks include components such as reactive dyes, inorganic salts, polymer components, preservatives, and activators. In particular, it is preferable to adjust the total amount of components other than water and organic solvent in the water-based ink with the reactive dye concentration and the polymer component.

(Water-soluble polymer)
The aqueous ink of the present invention preferably contains a polymer component. The polymer component is added to adjust the ink viscosity, or the polymer component is added so that the total amount of components other than water and organic solvent in the aqueous ink is 10% by mass or more and less than 20% by mass. This is particularly preferable for suppressing bleeding.

In this case, the polymer component preferably satisfies the following requirements.
(1) Add appropriate amount to increase ink drying viscosity and effectively prevent ink bleeding.
(2) After the water-based ink is discharged to form an image on the fabric, the polymer component needs to be easily removed in the washing step after the step of fixing the reactive dye to the fabric by the heating step. If a large amount of the polymer component remains, it is not preferable because the touch and texture become hard. As the polymer component, those having high solubility in dyed water or detergent are preferable.
(3) It exists stably in an ink having a surface tension of 20 mN / m or more and 35 mN / m or less of the present invention. Presence of being stable means that there is little change in physical properties such as precipitation and viscosity under various storage environments.
(4) Even when the ink is dried in the vicinity of the ejection opening of the head, it is easy to remove by re-dissolving, re-swelling, or re-dispersing with ink or cleaning liquid, and maintenance is easy.

  From the above, the polymer component is preferably a water-soluble polymer. Examples of the water-soluble polymer include synthetic polymers (eg, polyvinyl alcohol, polyvinyl pyrrolidone, polyvinyl methyl ether, polyethylene oxide, polyethylene glycol, polypropylene glycol, polyacrylamide, polyamine sulfone, vinyl alcohol-vinyl acetate copolymer, Polyacrylate, polyvinyl sulfate, poly (4-vinylpyridine) salt, polyallylamine salt, condensed naphthalene sulfonate, acrylic acid copolymer, methacrylic acid copolymer, styrene-itaconate copolymer, itacon Acid ester-itaconate copolymer, vinylnaphthalene-itaconate copolymer, etc.), cellulose derivatives (for example, methylcellulose, hydroxyethylcellulose, ethylhydroxyethylcellulose, hydroxypropylmethacrylate) Cellulose, hydroxypropylcellulose, carboxymethylcellulose salt, viscose, etc.), starch derivatives (eg, hydroxyalkyl starch, acetic acid starch, crosslinked starch, dextrin, cationic starch, phosphate starch, carboxymethyl starch salt, etc.), natural polymer (For example, alginates, gelatin, albumin, casein, gum arabic, tonganto gum, lignin sulfonate, etc.).

  Among these, acrylic acid copolymers and methacrylic acid copolymers can be preferably used.

  Particularly, those having an acid value of 60 to 300, Tg of 20 to 100 ° C., and a weight average molecular weight of about 5000 to 60000 can be preferably used.

(Fabric)
The fabric used in the present invention substantially does not contain an ink holding component mainly composed of a water-soluble polymer. By omitting the so-called pre-treatment step of the fabric, there is an advantage that the cost can be reduced and the time can be reduced. However, in the inkjet printing method of the present invention, heating the fabric has a great effect on suppressing ink bleeding. Does not contain an ink-holding component mainly composed of a water-soluble polymer, heat is easily transferred to the fabric, which is preferable in terms of ink drying efficiency, and evaporative drying from the fabric is fast, and the ink is thickened by drying. Therefore, it is preferable. In order to uniformly dye the fabric, it is preferable not to contain an ink holding component mainly composed of a water-soluble polymer.

Substantially no ink-holding component mainly composed of water-soluble polymer means that the content of the ink-holding component mainly composed of water-soluble polymer is 100 mg / m ² or less.

  The fabric is preferably a fabric in which an aqueous ink is discharged to form an image on the fabric and then the reactive dye can be fixed by a heating step, and cotton and silk are preferable.

  Moreover, it is preferable that the fabric used for this invention contains an alkaline component. Since reactive dyes are accompanied by acid removal when reacting with the reactive groups of the fabric, an alkali component for neutralizing and removing the acid is required to advance the reaction. Conventionally, in the pretreatment step, an ink holding component mainly composed of a water-soluble polymer is applied to the fabric, and an alkali component is also included in the component. In the present invention, the fabric to be used does not contain an ink holding component mainly composed of a water-soluble polymer, but preferably contains an alkali component.

  The alkali component may be inorganic or organic.

  Use inorganic hydroxides such as hydroxides such as lithium hydroxide, sodium hydroxide, and potassium hydroxide, carbonates such as potassium carbonate and sodium carbonate, potassium bicarbonate, and bicarbonates such as sodium bicarbonate. Can do.

The amount applied to the fabric is preferably 0.005 mol / m ² to 0.05 mol / m ² , more preferably 0.01 mol / m ² to 0.03 mol / m ² .

(Image formation process)
In the ink jet textile printing method of the present invention, an aqueous ink is discharged while heating the fabric to form an image on the fabric.

  The heating temperature is preferably such that the recording surface temperature of the recording medium is 30 to 70 ° C. Heating at less than 30 ° C. is not preferred because the suppression of bleeding is insufficient and drying takes time. If the temperature exceeds 70 ° C., ink ejection is greatly affected, and stable printing cannot be performed.

  As a heating method, a method in which a heating heater is incorporated in a recording medium conveyance system or a platen member and heating is performed from the lower side of the recording medium in a contact manner is particularly preferable. The heating method can be selected in a non-contact manner from below or above with a lamp or the like.

(Reactive dye immobilization process)
The ink jet textile printing method of the present invention includes a step of fixing a reactive dye on a fabric by a heating step after discharging an aqueous ink to form an image on the fabric.

  The pre-dried fabric is preferably subjected to steaming. The conditions may be determined in consideration of the type of fabric, etc., but in an environment of humidity 50 to 100% (more preferably humidity 80 to 100%) and temperature 90 to 120 ° C. (preferably 95 to 105 ° C.) It is preferable to be placed for 3 to 120 minutes (preferably 5 to 40 minutes). Further, after that, it is preferable to wash with warm water containing a surfactant (preferably a nonionic surfactant). The printed fabric subjected to such post-processing has excellent color development and fastness, and ink bleeding is reduced.

(Alkali component application step)
When an alkali component is not added to the fabric, it is necessary to impart alkali by a separate means. Either a method of applying alkali to the fabric before image formation or a method of applying alkali after image formation and before the heating step can be used. As the alkali, carbonate or bicarbonate can be preferably used.

  When applying alkali after image formation, it is necessary to prevent bleeding, and when applying alkali before image formation, it is necessary to sufficiently dry the wet cloth at the time of alkali application before image formation. There is.

  Examples of the present invention will be specifically described below, but the embodiments of the present invention are not limited thereto. In the examples, “%” represents mass% unless otherwise specified.

Example 1
(Ink preparation)
A reactive dye, a water-soluble resin, a solvent, and an activator were added so that the concentration in the ink described in Table 1 was reached, and the balance was adjusted with ion-exchanged water so that the balance became 100% by mass. After preparation, it was filtered through a 1 μm filter.

  Abbreviations in Table 1 represent the following.

RR24: C.I. I. Reactive Red24
RB72: C.I. I. Reactive Blue24
DEGBE: Diethylene glycol monobutyl ether DEGEE: Diethylene glycol monoethyl ether PG: Propylene glycol KF351: Silicon-based activator manufactured by Shin-Etsu Chemical Co., Ltd. BYK347: Silicon-based activator manufactured by Big Chemie Japan S465: Surfynol 465
F system: FTX400P (fluorine activator manufactured by Neos Co., Ltd.)

Example 2
(Print production 1)
A printing apparatus capable of printing four colors in parallel, using four water-based inks shown in Table 2 and fabric A, and piezo heads (720 dpi (where dpi represents the number of dots per inch), 14 pl of liquid). Evaluation was carried out using. The fabric A is a cotton broad containing sodium carbonate.

  Each of the water-based inks prepared was introduced into one head of the evaluation apparatus, a single color image was prepared, and the image quality was evaluated. The evaluation conditions are as follows.

Printing resolution: 720 dpi x 720 dpi
Head transport speed: 200 mm / sec (bidirectional printing)
In this apparatus, since the recording medium can be arbitrarily heated from below by a contact heater, the heater temperature was adjusted so as to be the fabric surface temperature shown in Table 2 (measurement of the white background) and heated.

  In addition, an ink emptying position and a blade wipe type maintenance unit are provided at the head storing position, and the head can be cleaned at an arbitrary frequency.

(Print production 2)
Similarly, prints were similarly produced using the water-based inks described in Table 3 and fabrics. In this case, alkali solution was introduced into two of the four heads, alkali was supplied from the inkjet head, and then a print was made with colored ink. The fabric B is an untreated cotton sheet and the fabric C is an untreated cotton broad.

  The alkaline solution is a solution of 3% sodium carbonate plus an appropriate amount of propylene glycol.

  The prints produced by the methods 1 and 2 were heated and colored with a textile steamer. Coloring condition is 94 ° C for 15 minutes. Then, after washing with water for 5 minutes and washing with 50 ° C. warm water for 5 minutes, it was dried and evaluated for print image quality.

(Print quality evaluation)
The evaluation was performed by comparing the color development with the following print on the comparative pretreated fabric.

  In print production 1, a comparative pretreated cloth (comparative pretreated cotton broad) obtained by dipping and drying an aqueous solution containing sodium alginate and sodium carbonate in advance on cotton broad was used.

  In print preparation 2, the comparative pre-treated cotton broad, and a comparative pre-treated cloth (compared pre-treated cotton tempura) prepared by dipping and drying an aqueous solution containing sodium alginate and sodium carbonate in advance on a cotton tempura It was. In print production 2, those using cotton candy in the evaluation of the present invention used the comparison pretreated cotton candy as a comparison, and those using cotton broad in the evaluation of the present invention were compared with pre-comparison processed cotton broad. Used as a comparison.

  Evaluation was obtained by rounding off the average score of five evaluators of 10 samples based on the following criteria.

Bleeding evaluation and color development evaluation 5: Equivalent to or higher than comparative pretreated fabric 4: Almost equivalent to comparative pretreated fabric 3: Slightly inferior to comparative pretreated fabric, but feasible 2: Inferior to comparative pretreated fabric 1: significantly inferior to the pre-comparison treated fabric.

  Ink No., which is a comparative ink, is used. Inks other than 5 were ejected stably. Ink No. No. 5 was missing, and the head cleaning was repeated to perform printing.

  As is apparent from the results in Tables 2 and 3, the printed fabric produced by the inkjet printing method of the present invention has less bleeding and higher color density for various fabrics than the comparative printed fabric. It has been found that it has excellent properties that are feasible. Further, the ink used in the present invention had good ejection stability.

Claims (5)

Inkjet printing including a step of discharging an aqueous ink containing at least a reactive dye, an organic solvent, and water to form an image on a heated fabric, and then fixing the reactive dye to the fabric by a heating step. A method,
The water-based ink has a total amount of components other than water and organic solvent of 10% by mass or more and less than 20% by mass, its surface tension is 20 mN / m or more and 35 mN / m or less, and
The fabric contains an alkali component, and the content of an ink holding component mainly composed of a water-soluble polymer is 100 mg / m ² or less ,
An ink-jet printing method comprising forming an image on the fabric by discharging the water-based ink while heating the surface temperature of the fabric to 30 ° C or higher and 70 ° C or lower.   The ink-jet printing method according to claim 1, wherein the water-based ink has a total amount of components other than water and organic solvent of 10% by mass or more and less than 15% by mass.   The inkjet printing method according to claim 1 or 2, further comprising a step of imparting alkali before the heating step.   The inkjet printing method according to any one of claims 1 to 3, wherein the water-based ink contains a silicone-based activator or a fluorine-based activator.   The ink-jet printing method according to any one of claims 1 to 4, wherein the water-based ink contains a water-soluble polymer.