JPH06306779A - Ink jet printing process - Google Patents

Abstract

PURPOSE:To enable the title dye printing of high-concentration and clear expression without ink staining by containing 2 or more colors of reaction dyes different in their reaction rates and ink jet-printing the cloth with small ink drops satisfying specific conditions. CONSTITUTION:In the preparation of an ink containing 2 or more colors of reaction dyes different in their reaction rates, as the reaction rate of a dye in the ink becomes slower, the ink drop is jetted earlier and the surface tension of the ink containing a dye of slower reaction rate is made smaller, for example, the difference of adjacent drops is set more than 3 dyne/cm in the surface tension. Cellulosic fiber and/or polyamide fiber cloth, preferably containing an alkaline substance beforehand is jet-dyed with the prepared ink, heat-treated usually and washed to realize ink jet print dyeing developing high coloration with excellent level dyeing without ink staining even on ink color mixing to each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a textile printing method by an ink jet method.

[0002]

2. Description of the Related Art Currently, the mainstream printing methods are screen printing and roller printing. These methods are not suitable for high-mix low-volume production, and it is also difficult to respond quickly to trends. Therefore, recently, establishment of a plateless electronic printing system has been demanded. In response to this demand, many printing methods using ink jet recording have been proposed, and expectations from various fields are increasing.

The requirements for ink-jet printing are (1) to provide a sufficient density for color development, (2) to have a high dyeing ratio of the dye to the cloth, and to easily treat the waste water after the washing step ( 3) The irregular bleeding due to color mixture between different colors is not conspicuous on the fabric, (4) the color reproduction range is wide, and (5) stable color development is obtained during the fixing process.

[0004]

In order to satisfy these requirements, conventionally, various additives have been mainly added to the ink, the amount of the ink ejected is manipulated, and the fabric is preliminarily treated. Has been done,
With such a method, the above requirements could not be satisfied at the same time.

Although it is not an example of textile printing, a method for satisfying the requirement of (3) is, for example, JP-A-62-16.
As described in Japanese Patent No. 1541, there is a method of ejecting ink in a specific lightness order.
In the method of performing the printing in the order based on the initial brightness of the ink, in the case of a reactive dye, the dyeing property changes depending on the reaction speed, and therefore it is impossible to satisfy the requirement (3).

Further, in textile printing, as a fixing step and a final step, a washing step for removing dye not dyed on the cloth is required, and as described in the requirement (2),
It is necessary to handle it differently from the conventional case of recording on ordinary paper.

In particular, in the case of ink jet printing, the amount of dye adhering per unit area is small as compared with the conventional printing method, and therefore the delicate difference in the conditions in the fixing process greatly affects the color developability. Therefore, regarding the stable color development which is the requirement of (5), technical improvement peculiar to the printing method is demanded especially in the case of inkjet printing.

As described above, according to the conventional technique, although some requirements are satisfied, the requirements are satisfied at the same time and all the problems related to them are solved.
Up to now, there is no known ink jet printing method capable of stably providing the highest quality image.

Further, since the dyeing rate of the dye is low in the conventional method using a sizing agent such as a general screen and roller printing, a large amount of the dye is used. As a result, the outflow of the dye in the washing process pollutes the environment. Is the cause.

Therefore, the present invention provides a printing method which solves the above-mentioned problems associated with conventional general ink jet printing, stably gives a dyed product with clear, high density and high definition and has a high dyeing rate. Aimed to provide.

[0011]

The above-mentioned objects of the present invention can be achieved by the following present invention. That is, the present invention includes at least (a) a step of sequentially applying at least two or more colors of ink to the cloth as ink droplets to form a color mixture portion,
Inkjet having (b) a step of heat-treating the cloth to dye the dye in the ink onto the cloth, and (c) a step of washing the cloth to remove the undyed dye from the cloth In the textile printing method, there is provided an inkjet textile printing method, characterized in that the inks contain reactive dyes having different reaction rates, and inks are applied in order from the ink containing the reactive dye having a slow reaction.

In the present invention, at least (a) a step of sequentially applying at least two or more colors of ink as ink droplets to a cloth to form a mixed color portion, and (b) heat treating the cloth to form the ink. In an inkjet printing method, which comprises a step of dyeing a dye in a cloth onto a cloth, and (c) a step of cleaning the cloth to remove an undyed dye from the cloth, the inks having different reaction rates Provided is an ink-jet printing method, wherein an ink containing a dye and containing a slow-reacting reactive dye has a smaller surface tension.

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

[0014]

The present inventors have conducted an investigation on the inkjet printing method so as to simultaneously satisfy the above-mentioned various performance requirements. As a result, the thickness of the cloth or the cloth can be reduced by (1) performing the driving in order from the ink having the slow-reacting reactive dye, or (2) decreasing the surface tension of the ink having the slow-reacting reactive dye. Even if the structure of the fibers (fiber length, thickness, number from the average, etc.) is slightly different, the level dyeing property and the dyeing rate are improved irrespective of this, and bleeding especially in the mixed color portion between different colors It was found that it would be improved. It was also found that a stable print can be obtained without showing a large difference in color development even if the fixing conditions are slightly different. This is because the slower the reaction of the dye, the closer it is to the reaction locus of the fiber.
It is considered that this is because the influence of the difference in dyeing property caused by the difference in reaction rate is reduced, and the bleeding of the slow-reacting dye during heat treatment in the fixing step is less likely to occur.

The cloth used in the present invention is preferably a cloth mainly composed of cellulose fibers and / or polyamide fibers containing at least an alkaline substance. There is no particular limitation on the method for producing the cloth, but it is disclosed in JP-A-63-1
168382, the cloth etc. which are described in Japanese Patent Publication No. 3-46589 can be used.

The physical characteristics of the fibers and yarns constituting the cloth are generally that the fiber length is large, the yarns and fibers are thin, and
The higher the number, the better. For example, in the case of a cloth mainly composed of cellulose fibers, the average fiber length is 25 to 60 mm,
The average fiber thickness is 0.6 to 2.2d, and the number is 70 to more than the average.
In the case of a fabric composed of 150 / cm fibers or a silk fiber which is a polyamide fiber as a main component, an average fiber thickness of 1 to 1 composed of fibers having an average fiber thickness of 2.5 to 3.5 d.
Those made of silk thread of 4 to 147d are preferable.

The cloth used in the present invention may be subjected to a conventional pretreatment, if necessary. In particular, 0.01 to 20% by weight of cloth containing 0.01 to 5% by weight of an alkaline substance, or a substance selected from the group of water-soluble metal salts, water-soluble polymers, urea and thiourea
In some cases, it may be preferable to contain the dye and to print it.

Examples of the alkaline substance to be added 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. Alternatively, alkali metal bicarbonates; organic acid metal salts such as calcium acetate and barium acetate; ammonia and ammonia compounds. In addition, sodium trichloroacetate, which becomes an alkaline substance under steaming and dry heat, can also be used. Particularly preferred alkaline substances for dyeing reactive dyes include sodium carbonate and sodium bicarbonate.

Further, the water-soluble polymer includes natural water-soluble polymer and synthetic water-soluble polymer. First, examples of natural water-soluble polymers include starches such as corn flour and wheat flour; carboxymethyl cellulose, methyl cellulose,
Cellulose such as hydroxyethyl cellulose; polysaccharides such as sodium alginate, gum arabic, locust bean gum, tragacanth gum, guar gum and tamarind seeds; proteins such as gelatin and casein; tannins; lignins and the like. Next, examples of synthetic water-soluble polymers include polyvinyl alcohol compounds, polyethylene oxide compounds, acrylic acid compounds, maleic anhydride compounds, and the like. Of these, polysaccharide polymers and cellulose polymers are preferable.

As the water-soluble metal salt, for example, a typical ionic crystal such as a halide of an alkali metal or an alkaline earth metal is produced, and the pH of the aqueous solution thereof is 4
The compound which is 10 is mentioned. Typical examples of such compounds include alkali metal salts such as NaCl and N.
a ₂ SO ₄ , KCl, CH ₃ COONa and the like, and examples of the alkaline earth metal salt include CaCl ₂ , MgCl _{2 and the} like. Of these, salts of Na, K and Ca are preferable.

Next, the influence of the moisture content of the cloth is large, and the official moisture content of the fibers constituting the cloth (for example, 8.5% of cellulose fiber and 12% of silk fiber) is increased by 5 to 100%, preferably 6 to. Fabrics adjusted to 80% increase are preferred.

As a method for adjusting the amount of water, a step of immersing in pure water or an aqueous solution of the above pretreatment agent, squeezing with a roller, and drying if necessary, is not limited to this. . The moisture content is calculated by the following formula.

[0023]

Moisture content (%) = {(W−W ′) / W ″} × 100 In the above formula, W is the weight of the sample before drying, W ′ is the weight of the sample after drying, and W ″ is washed with water. Represents the weight of the fabric that was post-drying.

The ink used in the present invention is a reactive dye,
Consists of water and organic solvent.

Each ink may contain a dye having a reactive group different from each other, and these inks may be combined to form a mixed color portion. When inks containing dyes having different reactive groups are used in combination, the general reaction rate is as follows: trichloropyridine, monochlorotriazine, vinyl sulfone (sulfonamide type), monochloromethoxy They are triazine, difluoromonochloropyrimidine, vinyl sulfone (sulfone type), methylsulfonylmethylchloropyrimidine, dichloroquinoxaline and dichlorotriazine.

On the other hand, when inks containing dyes having the same kind of reactive groups are combined to form a color-mixed portion, the order of reaction rates is determined on the basis of the hydrolysis rate of the dye in an aqueous solution. The order of the hydrolysis rate is determined, for example, in the case of a monochlorotriazine group, an aqueous solution of 40 to 6 is used.
This can be easily carried out by quantifying chlorine ions generated by heating at 0 ° C. for a certain period of time by a measuring means such as an ion chromatography or an ion meter.

When the reactive groups are used in a unified manner, they are preferably composed of a dye group having a monochlorotriazine group and / or a vinyl sulfone group. These two reactive groups are preferred because, in view of the system to which the present invention is directed, these two groups are preferred in terms of overall strength of reactivity.
This is because the reactive groups are excellent in balance. For example,
The effect of the present invention is not remarkable when the ink is constituted only by a dye group having a fast reaction dichlorotriazine or a slow reaction trichloropyrimidine group.

Specific examples of suitable dyes used in the ink used in the present invention include C.I. I. Reactive Yellow 2,15,37,42,76,95; C.I. I. Reactive Red 21,22,24,31,33,45,5
8,111,112,114,180,218,22
6; C.I. I. Reactive Blue 15, 19, 21, 3
8, 49, 72, 77, 176, 203, 220; C.I.
I. Reactive Orange 5, 12, 13, 35; C.I.
I. Reactive Brown 7, 11, 33, 46; C.I.
I. Reactive Green 8, 19; C.I. I. Reactive Violet 2, 6, 22; C.I. I. Examples thereof include those represented by Reactive Black 5, 8, 31, 39 and the like, but the present invention is not limited to these.

Dyes having different hues are included in each ink.
One or more kinds may be contained, and the total amount thereof is 2 to 30% by weight, preferably 3 to 25%, based on the total amount of the ink.
%, More preferably 4 to 20% by weight. When a plurality of dyes are used in combination, the reaction rate is judged according to the value of the dye having the largest content.

The preferable amount of water as the main component of the ink is 10 to 93% by weight, preferably 25 to 87% by weight, and more preferably 30 to 80% by weight based on the total amount of the ink.

As the organic solvent, for example, acetone,
Ketones or keto alcohols such as diacetone alcohol; ethers such as tetrahydrofuran and dioxane; diethylene glycol, triethylene glycol,
Tetraethylene glycol, dipropylene glycol,
Tripropylene glycol, polyethylene glycol,
Oxyethylene or oxypropylene addition polymers such as polypropylene glycol; alkylene glycols such as ethylene glycol, propylene glycol, trimethylene glycol, butylene glycol, hexylene glycol where the alkylene group contains 2 to 6 carbon atoms; , Trihexanes such as 6-hexanetriol; thiodiglycol; glycerin; lower alkyl of polyhydric alcohols such as ethylene glycol monomethyl (or ethyl) ether, diethylene glycol monomethyl (or ethyl) ether, triethylene glycol monomethyl (or ethyl) ether Ethers; such as triethylene glycol dimethyl (or ethyl) ether, tetraethylene glycol dimethyl (or ethyl) ether Lower dialkyl ethers of polyhydric alcohols; sulfolane, N- methyl-2-pyrrolidone,
1,3-dimethyl-2-imidazolidinone and the like can be mentioned.

The content of the above organic solvent is generally 3 to 60% by weight, preferably 5 to 5% by weight based on the total weight of the ink.
50%.

When the above-mentioned media are used in combination, they may be used alone or as a mixture, but preferable solvents are thiodiglycol, a polymer of oxyethylene or oxypropylene having a degree of polymerization of 2 to 4 and a mono- or dialkyl thereof. Some of them contain ether, and thiodiglycol alone or a mixture of diethylene glycol and thiodiglycol is particularly good.

Regarding other contained substances, for example, 0.
By adding 001 to 0.15% by weight of chlorine ion and / or sulfate ion, color development characteristics such as level dyeing property and dyeing rate are further improved.

Next, as a suitable method for adjusting the physical properties of the present invention, there is a method of decreasing the surface tension of an ink containing a reactive dye having a slow reaction. That is, when the same amount of ink droplets of a single color is deposited on the cloth, the surface tension is reduced as the ink having a lower slope of the curve of the heat treatment time and the sticking rate at a constant temperature. That is, the inks are arranged in the order of reaction speed of the reactive dyes contained therein so that the difference in surface tension between adjacent inks is 3 dyn / cm or more, preferably 5 dyn / cm or more. As the surface tension adjusting agent for the ink, various known surface tension adjusting agents such as cationic or nonionic surfactants; amines such as diethanolamine and triethanolamine; alcohols such as ethanol and isopropyl alcohol can be used. .

The main components of the ink of the present invention are as described above, but various other viscosity modifiers, optical brighteners and the like can be added as required. Examples thereof include viscosity adjusting agents such as polyvinyl alcohol, celluloses and water-soluble resins; pH adjusting buffer solutions; antifungal agents and the like.

The ink jet recording method for applying the ink of the present invention onto the cloth is not particularly limited, but a method of ejecting the ink as ink droplets by the action of heat energy, that is, a bubble jet method is particularly preferable. The reason is that the droplet landing speed is 5 to 20 m.
This is because the initial permeation speed of ink into the cloth, the degree of ink rebound, and the like are in the areas where the effects of the present invention are particularly remarkable.

In the present invention, a plurality of ink droplets are sequentially deposited on the cloth by the ink jet method to form an image with at least two colors of ink. On this occasion,
The total amount of each dye deposited on the formed color mixture is 0.02.
The range of 5 to 1 mg / cm ² is preferable, and further, the range of 0.
04-0.7 mg / cm ² , more preferably 0.05-
It is 0.5 mg / cm ² . This value can be obtained by measuring the ejection amount of the ink and the concentration of the dye in the ink. When the amount of the dye adhered is 0.025 mg / cm ² or less, high density color development is difficult and bleeding is not noticeable, so that the effect of the present invention is not clear. 1 mg / cm
^When it is ² or more, it becomes difficult to recognize the remarkable effect of improving the dyeing rate.

As described above, the ink of the present invention is applied onto the cloth, but in this state, the ink is merely adhered, so that the reaction fixing of the dye to the fiber and the removal step of the unfixed dye are continued. Is preferably applied. The method of such reaction fixing and removal of unreacted dye may be a conventionally known method, for example, a steaming method, an HT steaming method, a thermofix method, or an alkali pad steam when a cloth which has been previously alkali-treated is not used. Method, alkaline blotch steam method, alkaline shock method, alkaline cold fix method, etc. Among them, the steaming method and the HT steaming method are preferable because they further enhance the effects of the present invention. Subsequent cleaning is
It can be performed according to a known method.

The cloth subjected to the above-mentioned treatment is then cut into a desired size, and the cut pieces are subjected to steps such as sewing, bonding and welding to obtain a final processed product. , Clothing such as dresses, dresses, ties, swimwear, duvet covers, sofa covers, handkerchiefs, curtains, etc. can be obtained. For details on how to process cloth by sewing etc. into clothing and other daily necessities, use known books such as "Latest Knit Sewing Manual" (published by Senyi Journal) and monthly magazine "Soen" (published by Bunka Publishing Bureau). Many are listed.

In the present invention, when an ink containing dyes having different reaction rates is used to form a mixed color portion, the distribution of the dyes in the fabric is physically controlled by controlling the order of deposition or the surface tension of the ink. By optimizing this, it is possible to stably perform good ink jet printing that is clear, has no irregular bleeding in the color mixing portion, has a wide range of color reproduction. As a matter of course, the effect becomes more remarkable by combining the above various conditions at the same time.

It should be noted that the fixing rate is based on the color density, and the measuring method may be carried out by a general color measuring device. However, the present inventors have found that the high-speed spectrophotometer CA-35 (manufactured by Murakami Color Research Laboratory) ) And the coloring density K / S value was calculated from the reflectance R at the maximum absorption wavelength of the final dyed portion by the following equation.

[0043]

## EQU2 ## K / S = (1-R) ² / 2R R: reflectance at the maximum absorption wavelength

[0044]

EXAMPLES Next, the present invention will be specifically described with reference to Examples and Comparative Examples. In the text, parts and% are based on weight. I. Ink Preparation Reactive dye inks of 4 colors each described below were prepared.

(1) Reactive dye ink Reactive dye 10 parts Thiodiglycol 24 parts Diethylene glycol 11 parts Potassium chloride 0.004 parts Sodium sulfate 0.002 parts Sodium metasilicate 0.001 parts Iron chloride 0.0005 parts Water for 55 parts The following four dyes were used.

Yellow ink C. I. Reactive Yellow 95 (monochlorotriazine type) -magenta ink C.I. I. Reactive Red 226 (monochlorotriazine type) cyan ink C.I. I. Reactive Blue 15 (monochlorotriazine type) black ink C.I. I. Reactive Black 39 (monochlorotriazine type) The reaction rates of the dyes used are as follows. Magenta>Black>Yellow> Cyan The above components were mixed, the pH of the mixed solution was adjusted to 7.0 with sodium hydroxide, and the mixture was stirred for 2 hours, and then Fluorophore Filter FP-100 (trade name, manufactured by Sumitomo Electric Industries, Ltd.) To obtain water-based inks used in Examples 1 and 2 and Comparative Examples 1 and 2.

(2) Reactive dye ink Reactive dye 10 parts Thiodiglycol 23 parts Triethylene glycol monomethyl ether 6 parts Potassium chloride 0.05 parts Sodium metasilicate 0.0001 parts Iron chloride 0.0005 parts Zinc chloride 0.0003 parts 61 parts of water The following 4 kinds of dyes were used.

Yellow ink C. I. Reactive Yellow 25 (difluoromonochloropyrimidine type) -magenta ink C.I. I. Reactive Red 24 (monochlorotriazine type) -cyan ink C.I. I. Reactive Blue 52 (trichloropyrimidine type) -Black ink C.I. I. Reactive Black 5 (vinyl sulfone type (sulfone type)) The reaction rates of the dyes used are as follows. Black>Yellow>Magenta> Cyan The above components were mixed, and the surface tension of each ink was adjusted with isopropyl alcohol within the range of 55 to 35 dyn / cm. Next, the pH of the mixed solution was adjusted to 7.0 with sodium hydroxide, the mixture was stirred for 2 hours, and then filtered with a Fluoropore filter FP-100 (trade name, manufactured by Sumitomo Electric Industries, Ltd.) to obtain Examples 3, 4 and Aqueous inks used in Comparative Examples 3 and 4 were obtained.

II. Inkjet dyeing device Color bubble jet copier PIXEL P, which is an inkjet recording system that uses thermal energy with the following specifications
RO (trade name, manufactured by Canon) was used. 1. Inkjet method: On-demand type (bubble jet method) 2. Head voltage: 24V 3. Head temperature: 35 ° C 4. Drive pulse width: 10 μs 5. Driving frequency: 2.5 kHz 6. Distance between nozzle and fabric: 1 mm 7. Recording density: 16 dots / mm x 16 dots / mm
(400 dots / inch x 400 dots / inch).

III. Fabric The following two types of fabric were used. a: Flat cloth (100% Egyptian cotton, (sodium bicarbonate 5
%, Urea 5%, water 90%) solution, then dried at a squeezing ratio of 30%, final moisture content 15%) b: Habutae 8 sashimi (silk 100% (sodium bicarbonate 3%, urea 8%, water) (89%) solution, then dried at a squeezing rate of 30%,
Final moisture content 18%).

<Examples 1 and 2 and Comparative Examples 1 and 2> Four reactive dye inks prepared in (1) above and cloths a and b were used, and the order of ink injection was changed as shown in Table 1. Printing was performed using the above inkjet device. Thereafter, the printed matter was steamed at 102 ° C. for 6 to 8 minutes, washed, and dried. The obtained printed matter,
The level dyeing property, the bleeding property, and the color forming property were evaluated. As a result, when ink is sequentially ejected from the ink containing a slow-reacting dye, the bleeding property of the color mixture part is remarkably good and a very clear image is obtained.
The dyeing rate determined by the relative evaluation of the K / S value was also good.

[0052]

[Table 1] * 1 The order of reaction rates of the dyes used is as follows: cyan <yellow <black <magenta Imprinting order A = 1 cyan, 2 yellow, 3 black, 4 magenta B = 1 magenta, 2 black, 3 yellow, 4 cyan C = 1 yellow, 2 cyan, 3 magenta, 4 black.

* 2 Monochromatic ink print density 50% and 100% part of mixed color part (all 6 combinations of 4 colors)
Dyeing unevenness was comprehensively judged by the sharpness of the pattern when observed with the naked eye: ◯: Virtually no unevenness Δ: 100% part, some unevenness was observed in some combinations ×: 50% part, There is considerable unevenness in both 100% parts.

* 3 The bleeding of the dye at the boundary of the mixed portion of the two colors (all six combinations of four colors) due to the print density of 100% of the monochrome ink was visually observed and comprehensively judged: ◯: Substantially no bleeding Δ: Bleeding is seen in some combinations X: Some bleeding is noticeable.

* 4 The K / S values were measured for those steam-heat-treated for 6 minutes and those steam-heated for 8 minutes, and the difference was observed: ◯: The difference in K / S values was 1 or less. Small difference due to heating conditions Δ: K / S value difference is 1 to 2. There is some difference due to heating conditions. X: Difference in K / S value is 2 or more. There is a large difference due to heating conditions.

<Examples 3 and 4 and Comparative Examples 3 and 4> Using the four reactive dye inks prepared in (2) above and the cloths a and b, as shown in Table 2, the amount of isopropyl alcohol added was changed. By adjusting the surface tension of each ink, printing was performed using the above-mentioned inkjet device. Thereafter, the printed matter was steamed at 102 ° C. for 6 to 8 minutes, washed, and dried. The resulting prints were evaluated for level dyeing property, bleeding property, and color forming property. The results are shown in Table 2. As a result, when the surface tension of the ink containing the dye having a slower reaction is decreased, the bleeding property of the color mixture part is remarkably good and a very clear image is obtained, and the dyeing determined by the relative evaluation of the K / S value. The rate was also good.

[0057]

[Table 2] * 2 to * 4 Same as * 2 to * 4 in Table 1, respectively. * 5 The order of reaction rates of the dyes used is as follows: cyan <magenta <yellow <black surface tension of each ink (dyn / cm) A = cyan: 35, magenta: 45, yellow: 50,
Black: 55 B = Cyan: 55, Magenta: 50, Yellow: 40,
Black: 35 C = Cyan: 45, Magenta: 40, Yellow: 55,
Black: 35.

[0058]

According to the ink jet printing method of the present invention, it is possible to stably obtain a dyed product which is clear and has a high density and high density without bleeding, and the dyeing rate at the time of printing is remarkably improved. By doing so, the problem of environmental pollution due to wastewater can be reduced.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor, Clothing Shirota 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor, Masahiro Haruta 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Within the corporation

Claims (12)

[Claims] 1. At least (a) a step of sequentially applying at least two or more colors of ink as ink droplets to a cloth to form a color-mixed portion, and (b) heat treating the cloth to dye the dye in the ink. In an ink-jet printing method having a step of dyeing a cloth with a cloth, and (c) removing the undyed dye from the cloth by washing the cloth, each of the inks contains a reactive dye having a different reaction rate. Then, the ink-jet printing method is characterized in that inks containing a reactive dye having a slow reaction are applied in order. 2. At least (a) a step of sequentially applying at least two or more colors of ink as ink droplets to a cloth to form a mixed color portion, and (b) heat-treating the cloth to dye the dye in the ink. In an ink-jet printing method having a step of dyeing a cloth with a cloth, and (c) removing the undyed dye from the cloth by washing the cloth, each of the inks contains a reactive dye having a different reaction rate. An ink jet printing method is characterized in that the ink containing a reactive dye having a slow reaction has a smaller surface tension. 3. The inkjet printing method according to claim 1, wherein the total amount of the reactive dyes adhering to the color-mixed portion is 0.025 to 1 mg / cm ² . 4. The inkjet printing method according to claim 1, wherein the cloth is a cloth containing cellulose fibers and / or polyamide fibers. 5. The inkjet printing method according to claim 1, wherein the reactive dye is a reactive dye having a monochlorotriazine group or a vinyl sulfone group. 6. The inkjet printing method according to claim 1, wherein the cloth is pretreated in advance before the step (a). 7. The ink-jet printing method according to claim 2, wherein when the inks are arranged in the order of reaction speed of the reactive dyes contained therein, the difference in surface tension between adjacent inks is 3 dyn / cm or more. 8. A fabric printed by the inkjet printing method according to claim 1. 9. A processed product obtained by further processing the cloth according to claim 8. 10. The processed product is obtained by cutting the fabric into a desired size and subjecting the cut pieces to a step of obtaining a final processed product. Processed goods. 11. The processed product according to claim 10, wherein the step for obtaining the final processed product is sewing. 12. The processed article is a garment, as claimed in claim 9.
The processed product according to any one of 1.