Inkjet printing processing method and inkjet printing method

Abstract

This invention provides an inkjet printing treatment method that can suppress both bleeding and reduction in water absorption when inkjet printing on highly absorbent fabrics, and can suppress color transfer. [Solution] An inkjet printing method for printing on fabric by applying a recording ink containing a reactive dye to the fabric, wherein the fabric has a diameter of less than 15 mm 5 seconds after 0.3 g of water is dropped onto it, and the processing solution contains urea or ethylene urea, and the content of the sizing agent contained in the processing solution is 1% by mass or less.

Description

[Technical Field]

[0001] The present invention relates to an inkjet printing processing method and an inkjet printing method. [Background technology]

[0002] In inkjet printing, bleeding can occur when printing directly onto fabric. Therefore, pretreatment is usually applied to the fabric to prevent bleeding and improve the fixation of the colorant to the fabric (see, for example, Patent Documents 1-4). Conventionally, pretreatment was applied to the fabric by padding. Here, in this specification, padding means applying a predetermined liquid to the fabric by dipping or coating. At this time, the fabric is covered with a large amount of the above liquid. After padding, the fabric is subjected to a drying process to remove the liquid applied to it. As the pretreatment liquid, an aqueous solution containing a sizing agent, an alkaline agent, etc., is used. The sizing agent is included in the aqueous solution to prevent bleeding, and the alkaline agent is included to improve fixation. A method of applying pretreatment using an inkjet method has also been disclosed (see, for example, Patent Document 5).

[0003] Some fabrics have particularly high water absorption, and these are also subjected to similar pretreatment (see, for example, Patent Documents 6 and 7). [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Patent No. 4858533 [Patent Document 2] Patent No. 4710337 [Patent Document 3] Patent No. 4274011 [Patent Document 4] Patent No. 4623258 [Patent Document 5] Japanese Patent Publication No. 2024-25269 [Patent Document 6] Japanese Patent Publication No. 2010-209489 [Patent Document 7] Japanese Patent Publication No. 2007-154017 [Overview of the Initiative] [Problems that the invention aims to solve]

[0005] When the above-mentioned highly absorbent fabrics were pre-treated by padding, the following problems arose. First, the highly absorbent fabrics absorbed a large amount of pre-treatment solution, resulting in a heavy drying load for the fabric. Second, even after washing the fabric, the starch contained in the pre-treatment solution remained on the fabric, reducing its absorbency.

[0006] The present invention has been made in view of the above-mentioned problems and circumstances. The problem to be solved by the present invention is to provide an inkjet printing treatment method and an inkjet printing method that can suppress bleeding and reduction in water absorption when performing inkjet printing on highly absorbent fabrics, and can suppress color transfer. [Means for solving the problem]

[0007] To solve the above problems, the inventors diligently studied the characteristics of the processing solution used when performing inkjet printing on highly absorbent fabrics. As a result, the inventors discovered that the conditions of the sizing agent contained in the processing solution greatly affect the image quality, such as bleeding, when performing inkjet printing on highly absorbent fabrics, and thus arrived at the present invention. That is, the above problems according to the present invention are solved by the following means.

[0008] 1. An inkjet printing method for applying a processing solution to a fabric when printing by applying a recording ink containing a reactive dye to the fabric, The aforementioned fabric has a diameter of less than 15 mm after 5 seconds when 0.3 g of water is dropped onto it. The aforementioned processing liquid contains urea or ethylene urea, A treatment method for inkjet printing on fabrics, wherein the content of the paste contained in the treatment liquid is 1% by mass or less.

[0009] 2. The treatment method for inkjet printing on fabrics according to claim 1, wherein the basis weight of the fabric is 250 g / m 2 or more.

[0010] 3. The treatment method for inkjet printing on fabrics according to claim 1, wherein the treatment liquid contains the paste, and the paste is at least one selected from sodium alginate, carboxymethyl cellulose, and starch.

[0011] 4. The treatment method for inkjet printing on fabrics according to claim 1, wherein the treatment liquid contains a low-viscosity water-soluble polymer.

[0012] 5. The treatment method for inkjet printing on fabrics according to claim 4, wherein the low-viscosity water-soluble polymer is polyethylene glycol.

[0013] 6. The treatment method for inkjet printing on fabrics according to claim 1, wherein the treatment liquid contains an alkali agent.

[0014] 7. The treatment method for inkjet printing on fabrics according to claim 6, wherein the alkali agent is potassium carbonate or potassium hydrogen carbonate.

[0015] 8. The treatment method for inkjet printing on fabrics according to claim 1, wherein the treatment liquid does not contain a paste.

[0016] 9. The treatment method for inkjet printing on fabrics according to claim 1, wherein the viscosity of the treatment liquid is 3.5 mPa·s or more.

[0017] 10. The treatment method for inkjet printing on fabrics according to claim 1, wherein the recording ink does not contain a paste.

[0018] 11. The treatment method for inkjet printing on fabrics according to claim 1, wherein the treatment liquid is applied to the fabric using an inkjet head.

[0019] 12. Apply the processing solution to the fabric by the inkjet printing processing method described in any one of paragraphs 1 to 11, and apply the recording ink containing the reactive dye to the fabric before or after applying the processing solution to the fabric. An inkjet printing method characterized in that the processing liquid and the recording ink are applied to the fabric using an inkjet head.

[0020] 13. The inkjet printing method according to paragraph 12, characterized in that the fabric has not been treated with a sizing agent before the application of the processing liquid and the recording ink to the fabric.

[0021] 14. Dispense the processing liquid and the recording ink in any order, with the discharge volume of the processing liquid being 30 g / m². 2 The inkjet printing method according to paragraph 12, characterized in that it is as follows.

[0022] 15. An inkjet printing method for applying a processing solution to a fabric when printing by applying a recording ink containing a reactive dye to the fabric, A method for inkjet printing, wherein if the diameter of the fabric after 5 seconds when 0.3g of water is dropped onto it is 7mm or less, a first processing solution is used as the processing solution, and if the diameter of the fabric after 5 seconds when 0.3g of water is dropped onto it is 15mm or more, a second processing solution having a higher sizing agent content than the first processing solution is used as the processing solution.

[0023] 16. The content of the adhesive in the first processing liquid is 1% by mass or less. The inkjet printing treatment method according to item 15, wherein the content of the sizing agent in the second treatment liquid is more than 1% by mass.

[0024] 17. Contains urea or ethylene urea, The adhesive content is characterized by being 1% by mass or less. A treatment solution for printing on fabrics with a diameter of 7 mm or less 5 seconds after adding 0.3 g of water.

[0025] 18. An inkjet printing apparatus for use in inkjet printing, wherein the processing solution is applied to the fabric by the inkjet printing processing method described in paragraph 1, and a recording ink containing a reactive dye is applied to the fabric before or after the processing solution is applied to the fabric, An inkjet printing apparatus comprising a first application unit for applying the recording ink to the fabric, and a second application unit for applying a processing liquid to the fabric. [Effects of the Invention]

[0026] The present invention provides an inkjet printing treatment method and an inkjet printing method that can suppress both bleeding and reduction in water absorption when performing inkjet printing on highly absorbent fabrics, and can also suppress color transfer.

[0027] Although the mechanism of action or mechanism of the present invention is not yet clear, it is speculated as follows.

[0028] When recording ink is applied to a highly absorbent fabric, it is presumed that the ink penetrates quickly in the thickness direction of the fabric, resulting in less spreading and bleeding on the fabric's surface. Therefore, when applying recording ink to a highly absorbent fabric, the need to include a sizing agent in the pretreatment solution to suppress bleeding is reduced. However, it is thought that a large amount of sizing agent remaining on the fabric will decrease its water absorption. Conversely, if the amount of sizing agent in the pretreatment solution is reduced, the amount of sizing agent remaining on the fabric will also decrease, thus suppressing the decrease in the fabric's water absorption. Thus, it is presumed that when performing inkjet printing on highly absorbent fabrics, controlling the amount of sizing agent in the treatment solution can achieve both suppression of bleeding and suppression of decreased water absorption.

[0029] Furthermore, when the amount of sizing agent remaining on the fabric decreases, the amount of colorant adsorbed by the sizing agent also decreases. Therefore, it is presumed that color transfer caused by the colorant adsorbed by the sizing agent will be suppressed during the washing process after the recording ink has been applied to the fabric. [Brief explanation of the drawing]

[0030] [Figure 1] This is a flowchart showing the inkjet printing method of this embodiment. [Figure 2] This is a schematic diagram illustrating the inkjet printing apparatus used in the inkjet printing method of this embodiment. [Modes for carrying out the invention]

[0031] 1. Processing method for inkjet printing One embodiment of the inkjet printing treatment method of the present invention involves applying a treatment solution to a fabric when printing with a recording ink containing a reactive dye. The fabric then has a diameter of less than 15 mm after 5 seconds when 0.3 g of water is dropped onto it. The treatment solution contains urea or ethylene urea, and the content of the sizing agent in the treatment solution is 1% by mass or less. Because the inkjet printing treatment method of this embodiment has the above configuration, it provides the following effects. In other words, when performing inkjet printing on a highly absorbent fabric, it is possible to suppress both bleeding and reduction in water absorption. Furthermore, it is possible to suppress color transfer caused by colorants adsorbed by the sizing agent. Note that the inkjet printing treatment method of this embodiment may be performed before applying the recording ink to the fabric, or after applying the recording ink to the fabric. It is also preferable that the recording ink does not contain a sizing agent. Because the recording ink does not contain an adhesive, the decrease in water absorption of the fabric can be suppressed.

[0032] In the inkjet printing processing method of this embodiment, it is preferable to apply the processing solution directly to the fabric using an inkjet head, without performing the conventional pretreatment by padding. However, when pretreatment is performed by padding on fabrics with particularly high water absorption, the following problems arise: The pretreatment takes time, which can delay the delivery of the printed product. There is also the cost of the pretreatment process. Furthermore, the pretreated fabric may deteriorate over time and cannot be stored for long periods. In contrast, by applying the processing solution to the fabric using an inkjet head, the pretreatment time can be shortened, and the delivery of the product can be shortened. In addition, the amount of processing solution used is reduced, which lowers the cost of the pretreatment process. Furthermore, because the interval between applying the processing solution and applying the recording ink is short, deterioration of the pretreated fabric over time can be suppressed, and it can be stored for long periods.

[0033] Furthermore, in the padding method of pretreatment, the treatment solution is applied to the entire surface of the fabric, resulting in a large amount of absorption of the treatment solution by the fabric. Fabrics with particularly high water absorption absorbed the treatment solution especially heavily. Therefore, the drying load during the drying process was significant. Additionally, in the washing process, a post-treatment step for inkjet printing, a large amount of washing solution and a long washing time were required to remove the treatment solution. In contrast, by applying the treatment solution to the fabric using an inkjet head, the amount of treatment solution absorbed by the fabric can be controlled, reducing the drying load. Furthermore, in the washing process, the amount of washing solution and washing time can be reduced, simplifying the washing process. Also, in the padding method, uneven application of the sizing agent could occur, sometimes resulting in color variations during inkjet printing. By applying the treatment solution to the fabric using an inkjet head, such color variations can be suppressed.

[0034] Furthermore, in the padding method of pretreatment, as mentioned above, the amount of treatment solution absorbed by the fabric is large, resulting in a high drying load. In contrast, in the method of applying the treatment solution to the fabric using an inkjet head, drying of the treatment solution is unnecessary, or only minimal drying is required, thus reducing the drying load. This method, in which the recording ink is applied to the fabric without drying after the treatment solution has been applied, is sometimes called the "Wet on Wet method." This also includes the case where the treatment solution is applied to the fabric after the recording ink has been applied, without drying. In the "Wet on Wet method," when the recording ink is applied to a wet fabric, the recording ink penetrates the fabric easily, and therefore, in the case of white fabrics with high absorption capacity, there is the advantage that the white background becomes less visible.

[0035] Furthermore, the viscosity of the processing solution is preferably 3.5 mPa·s or higher, more preferably 3.5 to 10.0 mPa·s, and particularly preferably 3.5 to 8.0 mPa·s. A viscosity of 3.5 mPa·s or higher for the processing solution improves the ejection performance when the processing solution is ejected from the inkjet head.

[0036] Furthermore, when applying the processing solution to the fabric using an inkjet head, the discharge rate of the processing solution is 30 g / m². 2 The following is preferable: The discharge volume of the above-mentioned processing liquid is 5 to 20 g / m³. 2 It is even more preferable that the discharge rate of the processing liquid be 30 g / m³. 2 The following advantages are available, such as suppressing seepage upon impact of the processing liquid.

[0037] Furthermore, the ejection method for the processing solution in the inkjet head used to dispense the processing solution is not particularly limited. The ejection method can be selected from various methods such as the piezoelectric method, the thermal method, and the continuous method. The piezoelectric method and the continuous method are preferred because they have a high probability of stably ejecting processing solutions containing polymer materials, and the piezoelectric method is particularly preferred because it is compact and highly integrated.

[0038] <Fabric> In the inkjet printing method of this embodiment, the fabric has a diameter of less than 15 mm after 5 seconds when 0.3 g of water is dropped. In this specification, such a fabric may be referred to as a "highly water-absorbent fabric". The above diameter is preferably 14 mm or less, and more preferably 5 mm or less. Since the fabric in the inkjet printing method of this embodiment has a diameter of less than 15 mm, it has high water absorption and can suppress bleeding when recording ink is applied. The 0.3 g of water is dropped onto the spread fabric from a position 10 mm above the fabric. The diameter of the water when it is dropped onto the fabric is the wet spread diameter of the water on the fabric, and is a value measured at the portion with the largest diameter in the range where the water on the fabric surface is wet. The above diameter of the water is the average value of the measured values measured 10 times. Also, the smaller the diameter of the fabric after 5 seconds when 0.3 g of water is dropped, the higher the water absorption of the fabric, but about 2 mm is considered to be the lower limit value.

[0039] The above highly water-absorbent fabric preferably has a basis weight of 250 g / m 2 or more. Further, the basis weight is more preferably 250 to 450 g / m 2 and particularly preferably 350 to 450 g / m 2 When the basis weight of the highly water-absorbent fabric is 250 g / m 2 or more, the water absorption of the fabric becomes higher, and bleeding when recording ink is applied to the fabric can be more effectively suppressed.

[0040] The material of the highly water-absorbent fabric is not particularly limited. Examples of the material of the highly water-absorbent fabric include cotton, silk, hemp, wool, nylon fiber, rayon fiber, and blends thereof. Among these, cotton is preferred. By using cotton as the material, the water absorption of the fabric becomes higher, and bleeding when recording ink is applied to the fabric can be more effectively suppressed. The highly water-absorbent fabric is preferably a fabric to which no sizing agent is applied. That is, it is preferable to apply the treatment liquid and the recording ink to a fabric to which no sizing agent adheres. By preventing the sizing agent from adhering to the fabric, it is possible to prevent a decrease in the water absorption of the fabric due to the sizing agent.

[0041] Furthermore, the towel fabric can be either "pile fabric," which is made of napped fibers that have not been cut, or "sheared fabric," which is made of napped fibers that have been cut.

[0042] <Processing solution> [Moisturizer] In the inkjet printing treatment method of this embodiment, the treatment solution contains urea or ethylene urea. When the treatment solution contains urea or ethylene urea, it also includes cases where it contains both urea and ethylene urea. Urea and ethylene urea are included in the treatment solution as humectants. The humectants promote the fixation of the reactive dye to the recording medium by steam in the color development step by steam treatment after image formation. This improves the color development density. Ethylene urea is particularly preferred because, when the treatment solution is alkaline, it is less susceptible to hydrolysis and has excellent long-term storage properties. The content of the humectant in the treatment solution is preferably 10% by mass or more. Furthermore, the content of the humectant in the treatment solution is preferably 10 to 30% by mass, and more preferably 15 to 25% by mass. Within the above range, sufficient dyeing or color development can be ensured while ensuring sufficient ejection from the inkjet head.

[0043] Furthermore, when the processing solution is injected using an inkjet head, urea and ethylene urea can improve injection performance by moisturizing the nozzle surface of the inkjet head.

[0044] [Dusting agent] Furthermore, in the inkjet printing treatment method of this embodiment, the content of the sizing agent in the treatment solution is 1% by mass or less. Preferably, the content of the sizing agent in the treatment solution is 0.5% by mass or less. Moreover, it is most preferable that the content of the sizing agent in the treatment solution is 0% by mass, that is, that the treatment solution does not contain any sizing agent. By having a sizing agent content of 1% by mass or less in the treatment solution, it is possible to prevent a decrease in the water absorption of the fabric due to the sizing agent. Furthermore, in the inkjet printing treatment method of this embodiment, since the fabric is the above-mentioned highly absorbent fabric, bleeding of the fabric is suppressed even if the content of the sizing agent in the treatment solution is 1% by mass or less. In this specification, the sizing agent is a water-soluble polymer having a viscosity of 4 to 100 mPa·s at 25°C for a 1% by mass aqueous solution.

[0045] Furthermore, if the processing solution contains a thickening agent, it is preferable that the thickening agent contained in the processing solution be at least one selected from sodium alginate, carboxymethylcellulose, and starch.

[0046] Furthermore, since the adhesive content in the processing solution is 1% by mass or less, color transfer due to the recording ink adsorbed on the adhesive can be suppressed.

[0047] Furthermore, when the processing solution is ejected from the inkjet head, it is preferable that the processing solution contains a small amount of adhesive. If the processing solution contains adhesive, the nozzle surface of the inkjet head dries and thickens due to the adhesive, which worsens the ejection performance. Therefore, a low amount of adhesive in the processing solution improves the ejection performance of the processing solution. In other words, by including the above-mentioned humectant in the processing solution and having a low amount of adhesive, the ejection performance when the processing solution is ejected from the inkjet head is improved.

[0048] [Other ingredients] Preferably, the processing solution further contains a solvent, a water-soluble polymer, an alkaline agent, a surfactant, a preservative, water, etc. It is also preferable that the processing solution contains a color ink, and that the color ink contains a reactive dye.

[0049] (solvent) The solvent contained in the processing solution is preferably a general water-soluble organic solvent. Examples of solvents include alcohols, polyhydric alcohols, glycol ethers, amines, amides, heterocyclic compounds, and sulfoxides. Examples of alcohols include methanol, ethanol, propanol, isopropanol, butanol, isobutanol, sec-butanol, and t-butanol. Examples of polyhydric alcohols include ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, polypropylene glycol, butylene glycol, hexanediol, pentanediol, glycerin, hexanetriol, and thiodiglycol. Examples of glycol ethers include ethylene glycol alkyl ether, diethylene glycol alkyl ether, triethylene glycol alkyl ether, propylene glycol alkyl ether, dipropylene glycol alkyl ether, and tripropylene glycol alkyl ether. Examples of amines include ethanolamine, diethanolamine, triethanolamine, N-methyldiethanolamine, N-ethyldiethanolamine, morpholine, N-ethylmorpholine, ethylenediamine, diethylenediamine, triethylenetetramine, tetraethylenepentamine, polyethyleneimine, pentamethyldiethylenetriamine, and tetramethylpropylenediamine. Examples of amides include formamide, N,N-dimethylformamide, and N,N-dimethylacetamide. Examples of heterocyclic compounds include 2-pyrrolidone, N-methyl-2-pyrrolidone, cyclohexylpyrrolidone, 2-oxazolidone, and 1,3-dimethyl-2-imidazolidinone. Examples of sulfoxides include dimethyl sulfoxide.

[0050] The solvent content in the processing solution is preferably 5 to 40% by mass.

[0051] (Low viscosity water-soluble polymer) The low-viscosity water-soluble polymer contained in the processing solution can adjust the viscosity of the processing solution. When the processing solution is ejected from an inkjet head, the inclusion of a low-viscosity water-soluble polymer in the processing solution can improve the ejection performance of the processing solution from the inkjet head. The low-viscosity water-soluble polymer is a water-soluble polymer with a lower viscosity than a binder. Specifically, the low-viscosity water-soluble polymer is a water-soluble polymer whose viscosity at 25°C in a 1% by mass aqueous solution is less than 4 mPa·s. Here, in this invention, "water-soluble polymer" means that the amount of the target substance that dissolves in 100 parts by mass of water at 25°C is 5 parts by mass or more. Because the polymer is water-soluble, it can be used in water-based processing inks.

[0052] Examples of low-viscosity water-soluble polymers include polyvinylpyrrolidone, polyethylene glycol, ethylene oxide-propylene oxide copolymer, polyethylene oxide adduct of glycerin, polypropylene adduct of glycerin, polyethylene oxide adduct of diglycerin, and polypropylene adduct of diglycerin.

[0053] The content of the low-viscosity water-soluble polymer in the processing solution is preferably 10% by mass or less. If viscosity adjustment is not required, the processing solution does not need to contain the low-viscosity water-soluble polymer.

[0054] (Alkaline agent) The alkaline agent contained in the processing solution can promote the fixation of the reactive dye contained in the recording ink onto the recording medium. This can improve the color intensity of the reactive dye. Such an alkaline agent is at least one of a carbonate and a bicarbonate. Preferably, the carbonate and bicarbonate are at least one of a sodium salt and a potassium salt, respectively. Potassium carbonate or potassium bicarbonate is particularly preferred as the alkaline agent. Since these alkaline agents are less likely to precipitate from the processing solution, they can stabilize the ejection of the processing solution from the inkjet head when the processing solution is ejected from the inkjet head.

[0055] The alkaline agent content in the processing solution is preferably 10% by mass or less. Furthermore, the alkaline agent content in the processing solution is more preferably 3 to 10% by mass, and particularly preferably 4 to 8% by mass. Within this range, sufficient dyeing or color development can be ensured while ensuring sufficient ejection from the inkjet head. Furthermore, the processing solution is preferably alkaline with a hydrogen ion concentration index (pH) of 10 or less at 25°C due to the presence of the alkaline agent. The hydrogen ion concentration index (pH) of the processing solution at 25°C is more preferably 9 to 10.

[0056] (Surfactants) Surfactants can be cationic, anionic, amphoteric, or nonionic.

[0057] Examples of cationic surfactants include aliphatic amine salts, aliphatic quaternary ammonium salts, benzalkonium salts, benzethonium chloride, pyridinium salts, and imidazolinium salts.

[0058] Examples of anionic surfactants include fatty acid soaps, N-acyl-N-methylglycine salts, N-acyl-N-methyl-β-alanine salts, N-acyl glutamate salts, alkyl ether carboxylate salts, acylated peptides, alkyl sulfonates, alkylbenzene sulfonates, alkylnaphthalene sulfonates, dialkyl sulfosucrate salts, alkyl sulfoacetate salts, α-olefin sulfonates, N-acylmethyl taurine, sulfated oils, higher alcohol sulfate salts, secondary higher alcohol sulfate salts, alkyl ether sulfates, secondary higher alcohol ethoxysulfates, polyoxyethylene alkylphenyl ether sulfates, monoglyculfates, fatty acid alkylolamide sulfate salts, alkyl ether phosphate salts, and alkyl phosphate salts.

[0059] Examples of amphoteric surfactants include carboxybetaine type, sulfobetaine type, aminocarboxylate salts, and imidazolinium betaine.

[0060] Examples of nonionic surfactants include polyoxyethylene alkyl ethers, polyoxyethylene secondary alcohol ethers, polyoxyethylene alkylphenyl ethers (e.g., Emulgen 911), polyoxyethylene sterol ethers, polyoxyethylene lanolin derivatives, polyoxyethylene polyoxypropylene alkyl ethers (e.g., Newpol PE-62, manufactured by Sanyo Chemical Industries, Ltd.), polyoxyethylene glycerin fatty acid esters, polyoxyethylene castor oil, hydrogenated castor oil, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene sorbitol fatty acid esters, polyethylene glycol fatty acid esters, fatty acid monoglycerides, polyglycerin fatty acid esters, sorbitan fatty acid esters, propylene glycol fatty acid esters, sucrose fatty acid esters, fatty acid alkanolamides, polyoxyethylene fatty acid amides, polyoxyethylene alkylamines, alkylamine oxides, acetylene glycols, and acetylene alcohols.

[0061] When using these surfactants, they can be used individually or in combination of two or more types. It is preferable to add the surfactants in an amount ranging from 0.001% to 1.0% by mass relative to the total mass of the treatment solution.

[0062] (Preservative) The treatment solution, by containing a preservative, suppresses deterioration during storage and extends the storage period. Examples of preservatives include aromatic halogen compounds, methylenedithiocyanates, halogenated nitrogen sulfur compounds, and 1,2-benzisothiazolin-3-one. Commercially available preservatives may also be used. Examples of commercially available preservatives include "Preventol(registered trademark) CMK" (aromatic halogen compound, manufactured by Bayer AG) and "PROXEL(registered trademark) GXL" (1,2-benzisothiazolin-3-one, manufactured by ICI AG).

[0063] (water) As for the water, pure water such as ion-exchanged water, ultrafiltered water, reverse osmosis water, and distilled water, or ultrapure water, can be used. Furthermore, by using water sterilized by ultraviolet irradiation or hydrogen peroxide, it is possible to prevent the growth of mold and bacteria when the treatment solution is stored for a long period of time. The water content in the treatment solution is preferably 55% by mass or more and 80% by mass or less. By keeping the water content in the treatment solution within this range, the solid components can be sufficiently dissolved, and the solubility of the treatment ink can be improved.

[0064] Furthermore, it is preferable that the treatment solution containing the above-mentioned materials does not contain a reduction inhibitor (sodium m-nitrobenzenesulfonate). This prevents the precipitation of a reduction inhibitor with low solubility, which would reduce the shelf life of the treatment solution.

[0065] 2. Second inkjet printing processing method A second aspect of the present invention relates to an inkjet printing method in which a processing solution is applied to a fabric when printing with a recording ink containing a reactive dye. The method involves applying a processing solution to the fabric, wherein if the diameter of the fabric after 5 seconds when 0.3g of water is dropped onto it is 7mm or less, a first processing solution is used. If the diameter of the fabric after 5 seconds when 0.3g of water is dropped onto it is 15mm or more, a second processing solution with a higher sizing agent content than the first processing solution is used. This allows for switching the type of processing solution applied to multiple fabrics with different water absorption properties, thereby providing optimal printed materials for each fabric in terms of bleeding, color transfer, and water absorption. In other words, inkjet printing processing can be performed by switching between multiple fabrics with different water absorption properties and changing the processing solution to one with a sizing agent content appropriate for each fabric. As a result, inkjet printing performed using this second inkjet printing processing method can be suitable for printing on woven fabrics.

[0066] In the second inkjet printing processing method of this embodiment, a fabric with a diameter of 7 mm or less 5 seconds after dropping 0.3 g of water may be referred to as "7 mm diameter fabric." A fabric with a diameter of 15 mm or more 5 seconds after dropping 0.3 g of water may be referred to as "15 mm diameter fabric."

[0067] The second inkjet printing treatment method of this embodiment uses the first treatment solution when the fabric is "7 mm in diameter" and the second treatment solution when the fabric is "15 mm in diameter," as described above. The second inkjet printing treatment method of this embodiment is the same as the inkjet printing treatment method of this embodiment described above, except that the treatment solution is switched depending on the water absorption of the fabric. Furthermore, if the diameter of the fabric after 5 seconds when 0.3 g of water is dropped onto it is greater than 7 mm and less than 15 mm, it is preferable to use either the first or second treatment solution, or they may be mixed and used.

[0068] In the second inkjet printing treatment method of this embodiment, the conditions for the first treatment solution are the same as those for the treatment solution in the inkjet printing treatment method of this embodiment described above. Furthermore, the conditions for the second treatment solution are the same as those for the first treatment solution, except that the sizing agent content exceeds 1% by mass. The sizing agent content in the second treatment solution is preferably greater than 1% by mass, and more preferably greater than 1% by mass and 5% by mass or less.

[0069] 3. Treatment solution One embodiment of the processing solution of the present invention is a processing solution for printing on fabrics with a diameter of 7 mm or less 5 seconds after 0.3 g of water is dropped onto them, and is a processing solution specifically for such fabrics. The processing solution of this embodiment contains urea or ethylene urea, and the content of the sizing agent contained is 1% by mass or less. The conditions of the processing solution of this embodiment are the same as the conditions of the processing solution used in the inkjet printing processing method of this embodiment.

[0070] Another embodiment of the processing solution of the present invention is a processing solution for printing on fabrics with a diameter of 15 mm or more 5 seconds after dropping 0.3 g of water onto them, and is a processing solution specifically for such fabrics. Another embodiment of the processing solution of the present invention contains urea or ethylene urea, and the content of the sizing agent contained exceeds 1% by mass. Another embodiment of the processing solution of the present invention is the same as the processing solution used in the inkjet printing processing method of the above embodiment, except that the content of the sizing agent contained exceeds 1% by mass.

[0071] 4. Inkjet printing method One embodiment of the inkjet printing method of the present invention involves applying the processing solution to the fabric using the inkjet printing processing method of this embodiment, and applying the recording ink containing the reactive dye to the fabric before or after applying the processing solution to the fabric. The application of the processing solution and recording ink to the fabric is performed using an inkjet head. This makes it possible to suppress both bleeding and reduction in water absorption when performing inkjet printing on highly absorbent fabrics, and to suppress color transfer.

[0072] The inkjet printing method of this embodiment includes "treatment solution application S01" for applying a treatment solution to the fabric, "recording ink application S02" for applying recording ink to the fabric, and "steam treatment S03" for treating the fabric with steam, as shown in the flow chart in Figure 1. The inkjet printing method of this embodiment may further include "washing treatment S04" for washing the fabric and "drying treatment S05" for drying the fabric. Figure 1 is a flowchart of the inkjet printing method of this embodiment.

[0073] In this embodiment of the inkjet printing method, it is preferable that the fabric is not treated with a sizing agent before the processing solution and recording ink are applied to the fabric. This makes it possible to suppress the reduction in water absorption caused by the sizing agent in highly absorbent fabrics and to suppress color transfer.

[0074] The inkjet printing method of this embodiment involves ejecting the processing liquid and recording ink in any order, with an ejection volume of 30 g / m² of the processing liquid. 2 The following is preferable: "Discharging the processing liquid and recording ink in any order" includes both cases where the processing liquid is discharged onto the fabric first, followed by the recording ink, and cases where the recording ink is discharged onto the fabric first, followed by the processing liquid; either is acceptable. Furthermore, this also includes a method of randomly discharging the processing liquid and recording ink from each inkjet head. The inkjet printing method of this embodiment performs printing on the above-mentioned highly absorbent fabric, thus suppressing bleeding by the recording ink. Therefore, from the viewpoint of suppressing bleeding, it is not necessary to discharge the processing liquid before discharging the recording ink. Thus, the processing liquid may be discharged before the recording ink, or after the recording ink, and furthermore, they may be discharged randomly.

[0075] The inkjet printing method of this embodiment will be described in more detail below with reference to the drawings.

[0076] <Inkjet Printing Machine> Figure 2 is a schematic diagram showing an inkjet printing apparatus used in the inkjet printing method of this embodiment. The inkjet printing apparatus 1 comprises a belt-type media transport unit 10 and an inkjet-type ink supply unit 20.

[0077] The media transport unit 10 comprises a plurality of transport rollers 11, 12 and an endless belt 13 wrapped around the transport rollers 11, 12. One of the plurality of transport rollers 11, 12 is a drive roller that rotates the endless belt 13. The belt 13 has an adhesive outer surface and holds the recording medium, a cloth 100, on the upper part of its outer surface. As a result, the media transport unit 10 is configured to transport the cloth 100 held by the belt 13 in the transport direction [x] in the direction of rotation of the belt 13.

[0078] The ink supply unit 20 is equipped with a plurality of inkjet heads 21 that eject processing liquid or recording ink 200 onto the fabric 100 held by the media transport unit 10. The plurality of inkjet heads 21 have a first application unit for applying recording ink to the fabric 100 and a second application unit for applying processing liquid to the fabric 100. These inkjet heads 21 eject processing liquid or recording ink 200 toward the fabric 100 from a plurality of ink ejection openings. Each inkjet head 21 is mounted on a carriage 22 that moves back and forth in the transport width direction perpendicular to the transport direction [x] of the fabric 100, and ejects processing liquid or recording ink 200 across the transport width direction. Note that a plurality of inkjet heads 21 may be mounted on a single carriage 22.

[0079] The processing liquid or recording ink 200 ejected from each inkjet head 21 lands on the fabric 100 being transported by the media transport unit 10. Of these inkjet heads 21, the one mounted on the first carriage 22a located furthest upstream in the transport direction [x] is designated as the processing liquid head 21a. The processing liquid head 21a is filled with processing liquid 200a and ejects the processing liquid 200a. Of these inkjet heads 21, the one mounted on the second carriage 22b located downstream in the transport direction [x] is designated as the recording ink head 21b. The recording ink head 21b is filled with recording ink 200b and ejects the recording ink 200b. Furthermore, of these inkjet heads 21, the one located furthest downstream in the transport direction [x] may be designated as a post-processing head (not shown), and may be filled with processing liquid 200a as post-processing ink and eject functional ink 200a.

[0080] The inkjet printing apparatus 1 is capable of ejecting recording ink 200b from the recording ink head 21b onto a fabric 100 that has been treated with processing liquid 200a by impact.

[0081] Although only one recording ink head 21b is shown in Figure 2, a separate recording ink head 21b may be provided for each color of recording ink. Preferably, each recording ink head 21b corresponding to each color of recording ink is mounted on the same carriage 22.

[0082] Furthermore, it is preferable that the processing liquid head 21a can switch between and apply multiple types of processing liquids. The processing liquid head 21a may switch between and apply multiple types of processing liquids by changing the processing liquids. Alternatively, the processing liquid head 21a may be equipped with multiple processing liquid heads, and multiple types of processing liquids may be filled into each processing liquid head, allowing for the switching between and application of multiple types of processing liquids. For example, when switching between a first processing liquid and a second processing liquid, the processing liquid head may be equipped with a processing liquid head for the first processing liquid and a processing liquid head for the second processing liquid. In addition, instead of using a processing liquid head, the processing liquid may be applied to the fabric by dipping or the like. In that case, the processing liquid may be switched using a processing liquid application device for dipping or the like, or multiple processing liquid application devices may be used to switch between processing liquids.

[0083] Furthermore, the ink ejection method in the inkjet head 21 is not particularly limited. The ejection method is the same as that described for the ejection method of the processing liquid in the inkjet head used to apply the processing liquid.

[0084] Although not shown in the illustration, the inkjet printing apparatus 1 may also be equipped with a drying means between the processing liquid head 21a and the recording ink head 21b. This drying means can dry the functional ink 200a that has landed on the fabric 100 before the recording ink 200b lands. In this embodiment of the inkjet printing method, a highly absorbent fabric is used as the recording medium, so bleeding of the recording ink is suppressed, and drying after applying the processing liquid to the fabric is not necessary. However, the fabric may be dried to further prevent bleeding. When drying the processing liquid 200a with the drying means, it is preferable to dry and remove as much of the water and solvent from the processing liquid 200a applied to the fabric 100 as possible, to the extent that bleeding of the subsequent recording ink 200b can be prevented.

[0085] Therefore, it is preferable that the drying means perform the drying process by setting the surface temperature of the recording medium 100 to a temperature suitable for each composition of the processing liquid 200a, within the range of 30°C to 80°C. Such drying means can be appropriately selected and used from drying means using temperature-controllable air or hot air, drying means using a hot plate, drying means using visible light or far-infrared light, drying means using a heat roller, drying means using microwave irradiation, etc. Furthermore, when a drying means is provided, it is preferable to provide an exhaust pipe or fan to remove the steam generated by drying from inside the device.

[0086] Furthermore, the processing liquid head 21a and the recording ink head 21b may not be mounted on the carriage 22, but rather arranged across the transport width direction perpendicular to the transport direction [x] of the processing liquid 100.

[0087] <Recording medium> The recording medium is fabric 100. Fabric 100 is the superabsorbent fabric used in the inkjet printing processing method of this embodiment.

[0088] <Recording ink> In the inkjet printing method of this embodiment, general inks of various colors containing reactive dyes are used as recording inks. For example, the recording ink contains reactive dyes as well as pure water such as deionized water, solvents, surfactants, inorganic salts, preservatives, etc. Of these, the solvent, surfactant, and preservative can be the same materials as those contained in the processing solution in the inkjet printing processing method of this embodiment described above.

[0089] [Reactive dyes] For reactive dyes, any common reactive dye of each color can be used. For example, both addition-type and substitution-type reactive dyes can be used. Reactive dyes having a monochlorotriazine group as the reactive group are particularly preferred. Below are specific compounds of reactive dyes preferably used in the inkjet printing method of this embodiment. Reactive dyes are not limited to these exemplified compounds.

[0090] In the inkjet printing method of this embodiment, the reactive dyes that are preferably used are: CIReactive Yellow;2, 3, 7, 15, 17, 18, 22, 23, 24, 25, 27, 37, 39, 42, 57, 69, 75, 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, CIReactive 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, CIReactive Red;2, 3, 3:1, 5, 8, 11, 21, 22, 23, 24, 24:1, 28, 29, 31, 33, 35, 43, 45, 49, 55, 56, 58, 65, 66, 78, 83, 84, 106, 111, 112, 113, 114, 116, 12 0,123,124,128,130,136,141,147,158,159,171,174,180,183,184,187,190,193,194,195,198,218,220,222,223,226,228,235, CIReactive Violet;1, 2, 4, 5, 6, 22, 23, 33, 36, 38, CIReactive 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, 19 4, 195, 198, 203, 204, 207, 209, 211, 214, 220, 221, 222, 231, 235, 236, CIReactive Green;8, 12, 15, 19, 21, CIReactive Brown;2, 7, 9, 10, 11, 17, 18, 19, 21, 23, 31, 37, 43, 46, CIReactive Black 5, 8, 13, 14, 31, 34, 39 These are some examples.

[0091] The content of the reactive dye contained in the recording ink is preferably 0.1 to 20% by mass, and more preferably 0.2 to 13% by mass.

[0092] [Inorganic salts] Inorganic salts are added to recording inks to maintain their viscosity and the stability of reactive dyes. Examples of such inorganic salts include sodium chloride, sodium sulfate, magnesium chloride, and magnesium sulfate. However, the inorganic salts are not limited to these.

[0093] <Inkjet Printing Method> The inkjet printing method of the embodiment is carried out using the inkjet printing apparatus 1 described above. In this case, first, a fabric 100, which is the recording medium, is prepared. This fabric 100 is a highly absorbent fabric. Furthermore, it is preferable that the fabric 100 is a fabric from which residual chemicals (such as sizing agents) and dirt used in the manufacturing process have been removed by washing beforehand. Next, the fabric 100 is moved in the transport direction [x] by rotating the transport rollers 11 and 12.

[0094] While moving the fabric 100 in the transport direction [x], the processing liquid 200a is discharged from the processing liquid head 21a in the ink supply unit 20 and landed on the fabric 100 (processing liquid application S01). As a result, the areas of the fabric 100 to which the processing liquid 200a has been applied become areas that have been pre-treated with the processing liquid 200a. At this time, the amount of processing liquid applied to the fabric 100 is 30 g / m 2 The following is preferable. This can suppress bleeding upon impact. Afterwards, if necessary, the functional ink 200a that has landed on the recording medium 100 may be dried. Note that using an inkjet head to deposit the processing liquid or recording ink onto the fabric is equivalent to applying the processing liquid or recording ink to the fabric.

[0095] Next, the areas of the fabric 100 that have been pre-treated by the processing solution 200a are designated as pre-treated areas. Then, recording ink 200b is ejected from the recording ink head 21b of the ink supply unit 20 to these pre-treated areas, causing the recording ink 200b to land (recording ink application S02). As a result, the reactive dye contained in the recording ink 200b is fixed to the fabric 100, and an image is formed.

[0096] Furthermore, after image formation with recording ink 200b, the fabric 100 is subjected to steam treatment S03 to promote the fixation of the reactive dye to the fabric 100. The process of fixing the reactive dye to the fabric by steam treatment S03 is also called the color development process. Subsequently, the fabric 100 with the reactive dye fixed is subjected to washing treatment S04 and drying treatment S05 to complete the inkjet printing method (see Figure 1).

[0097] The washing process involves washing the fabric with detergent and then rinsing it with water. The detergent is not particularly limited; any detergent that can wash away any residue from the fabric will suffice. Regular laundry detergent is acceptable.

[0098] Drying can be performed by bringing the material into contact with a heat roller or by placing it in a dryer.

[0099] 5. Inkjet printing equipment One embodiment of the inkjet printing apparatus of the present invention is an inkjet printing apparatus used in an inkjet printing process in which a processing solution is applied to a fabric by the inkjet printing processing method of the above embodiment, and a recording ink containing a reactive dye is applied to the fabric either before or after the application of the processing solution to the fabric. The inkjet printing apparatus of this embodiment comprises a first application unit for applying the recording ink to the fabric and a second application unit for applying the processing solution to the fabric. The conditions of the inkjet printing apparatus of this embodiment are the same as those of the inkjet printing apparatus described in the inkjet printing method of the above embodiment. [Examples]

[0100] The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples. In addition, in the following examples, the operations are carried out at room temperature (25°C) unless otherwise specified.

[0101] 1. Preparation of the treatment solution Each treatment solution was prepared according to the following procedure. The components shown in Tables I to III below were sequentially added to a preparation container and mixed, and thoroughly stirred. The resulting solution was filtered through a 1 μm (pore size) filter to obtain each treatment solution (Examples 1 to 11, Comparative Examples 1 to 4).

[0102] Details of each component are shown below.

[0103] (solvent) Glycerin Ethylene glycol

[0104] (Low viscosity water-soluble polymer) PEG2000: Polyethylene glycol (molecular weight 2000), PEG#2000 (trade name), manufactured by NOF Corporation. PEG6000: Polyethylene glycol (molecular weight 6000), PEG#6000 (trade name), manufactured by NOF Corporation. PEG11000: Polyethylene glycol (molecular weight 11000), PEG#11000 (trade name), manufactured by NOF Corporation.

[0105] (Alkaline agent) Potassium bicarbonate: Potassium bicarbonate (product name), manufactured by Takasugi Pharmaceutical Co., Ltd. Potassium carbonate: Potassium carbonate (product name), manufactured by Takasugi Pharmaceutical Co., Ltd.

[0106] (Moisturizer) Urea: Urea (product name), manufactured by Takasugi Pharmaceutical Co., Ltd. Ethylene urea: Ethylene urea (trade name), manufactured by Kanto Chemical Co., Ltd.

[0107] (Thickener) Carboxymethylcellulose: CMC Daicel 1130, manufactured by Daicel Mirise Co., Ltd. Sodium alginate: Algitex LL, manufactured by Kimika Corporation.

[0108] (Surfactants) Olphine (registered trademark) E1010: Acetylene glycol-based surfactant, manufactured by Nisshin Chemical Industry Co., Ltd.

[0109] (Preservative) Proxel (registered trademark) GXL: 20% dipropylene glycol aqueous solution of 1,2-benzisothiazolin-3-one, manufactured by Lonza Japan Co., Ltd.

[0110] Viscosity was measured at a temperature of 25°C using an E-type viscometer "TV-25" (manufactured by Toki Sangyo Co., Ltd.).

[0111] Tables I to III show the composition of each treatment solution, the type of fabric, the basis weight of the fabric, the diameter of the water droplet, and the viscosity. For each treatment solution, the unit for the numerical values ​​of each component is "mass%".

[0112] [Table 1]

[0113] [Table 2]

[0114] [Table 3]

[0115] 2. Preparation of recording ink (black ink) The following components listed in Table IV were added sequentially to a preparation container, and then deionized water was added to bring the total volume to 100% by mass. The mixture was then thoroughly stirred. The resulting solution was filtered through a 1 μm (pore size) filter to obtain black ink. In Table IV, the unit for the values ​​of each component is "mass%".

[0116] [Table 4]

[0117] Ethylene glycol 20.00% by mass Glycerin 10.00% by mass Reactive Black 5 (20.00% by mass) "Orphine (registered trademark) E1010" (acetylene glycol-based surfactant, manufactured by Nisshin Chemical Industry Co., Ltd.) 0.06% by mass "Proxel® GXL" (20% dipropylene glycol aqueous solution of 1,2-benzisothiazolin-3-one, manufactured by Lonza Japan Co., Ltd.) 0.20% by mass

[0118] Table V shows whether the water absorption, sizing agent content, basis weight, low viscosity polymer, and viscosity of each obtained treatment solution satisfy the necessary or preferred conditions of the present invention. Low viscosity polymer refers to a low viscosity water-soluble polymer. For water absorption, when 0.03 g of water droplets are dropped onto the fabric, the diameter of the droplet after 5 seconds (average value of 10 trials) is less than 15 mm if it is less than 15 mm, and B if it is 15 mm or more. For sizing agent content, A is defined as when the sizing agent content in the treatment solution is 1% by mass or less, and B is when it exceeds 1% by mass. For basis weight, A is defined as when the basis weight of the fabric is 250 g or more, and B is when it is less than 250 g. For low viscosity polymer, A is defined as when the treatment solution contains a low viscosity water-soluble polymer, and B is when it does not contain a low viscosity water-soluble polymer. For viscosity, A is defined as when the viscosity of the treatment solution is 3.5 mPa·s or more, and B is when it is less than 3.5 mPa·s.

[0119] [Table 5]

[0120] 3. Inkjet printing Samples were prepared by inkjet printing on a recording medium (fabric) using the inkjet printing apparatus shown in Figure 2 (Examples 1-11, Comparative Examples 1-4).

[0121] The inkjet printing apparatus shown in Figure 2 is equipped with a first carriage 22a located upstream and a second carriage 22b located downstream. The first carriage 22a is fitted with two piezo-type inkjet heads "KM1024iSAE" (manufactured by Konica Minolta) (the second one is not shown). The inkjet heads were loaded with the processing solutions obtained above. The second carriage 22b is fitted with two piezo-type inkjet heads "KM1024iSAE" (manufactured by Konica Minolta) (the second one is not shown). The inkjet heads were loaded with the black ink obtained above.

[0122] The fabric was conveyed by the conveying rollers 11 and 12 in the conveying direction [x] shown in Figure 2.

[0123] First, a total of 15 mL / m² of solution is dispensed onto the transported fabric from the two heads of the first carriage 22a. 2 The processing solution was uniformly applied to the entire surface of the fabric. Next, black ink was applied to the fabric from the two heads of the second carriage 22b to form a solid image.

[0124] The fabric was steam-treated at 103°C for 12 minutes to develop its color, and then rinsed with water. After that, the fabric was washed at 90°C, rinsed with water, dried, and a sample was obtained.

[0125] (Example 12) A processing solution was prepared in the same manner as in Comparative Example 1. Then, inkjet printing was performed in the same manner as in Comparative Example 1, except that the fabric was cotton broadcloth, the same as in Comparative Example 2. In the inkjet printing method of Example 12, the content of the sizing agent in the processing solution was 1.2% by mass, and the diameter of the water droplets on the fabric was 16 mm. Furthermore, in the inkjet printing method of Example 12, after the inkjet printing of Example 1 was completed, the processing solution filled in the two heads of the first carriage 22a was replaced with the processing solution of Comparative Example 1, and the fabric was switched to cotton broadcloth, and the processing solution was applied to the fabric. The sample obtained by the inkjet printing method of Example 12 was evaluated for bleeding, color transfer, and water absorption as shown below, and the results were found to be practically acceptable.

[0126] 4. Evaluation (1) Determining the water absorption of the fabric (unprinted woven fabric) The result was determined by the way a single drop of water from a dropper spread across a white fabric. A is a pass, and C is a fail.

[0127] A: The diameter of the water droplet is less than 15 mm. C: The diameter of the water droplet is 15 mm or larger.

[0128] (2) bleeding The boundary between the printed area and the white background of the obtained sample was observed using a handheld image quality analyzer, PiasII (manufactured by qea), and the blur width was measured. A and B are considered acceptable, while C is unacceptable. A represents the best evaluation result.

[0129] A: The bleeding width is less than 1 mm. B: Smudge width is 1mm or more but less than 2mm C: Smudge width is 2mm or more

[0130] (3) Dye migration The obtained samples were evaluated for staining (transfer of color) onto white surfaces using a test method compliant with ISO 105 C06. A is considered a pass, and C is considered a fail.

[0131] A: Level 3 or above C: Below Grade 3

[0132] (4) Water absorption The water absorption of the obtained samples (dyed fabrics) was evaluated using a test method compliant with JIS L 1907 sedimentation method. A and B are considered pass, and C is considered fail. A represents the best evaluation result.

[0133] A: Less than 1 second until sinking B: 1 second or more, less than 10 seconds until sinking C: More than 10 seconds until sinking

[0134] The evaluation results are shown in Table VI.

[0135] [Table 6]

[0136] From the examples and comparative examples, it can be seen that, with the inkjet printing treatment method of the present invention, when the diameter of the water droplet dropped onto the fabric is less than 15 mm, bleeding is suppressed and the water absorption of the fabric after inkjet printing is good.

[0137] Furthermore, Comparative Example 1 shows that when the sizing agent content in the treatment solution exceeds 1% by mass, color transfer occurs and the water absorption of the fabric decreases. [Explanation of symbols]

[0138] 1. Inkjet printing machine 10. Media transport section 11,12 Conveyor rollers 13 belts 20 Ink supply unit 21 Inkjet Heads 21a Processing head 21b recording ink head 22 Carriage 22a First carriage 22b Second Carriage 100 fabric 200 Processing solution or recording ink 200a Treatment liquid 200b recording ink [x] Conveying direction S01 Processing solution application S02 Recording ink application S03 Steam treatment S04 Laundry Process S05 Drying treatment

Claims

1. An inkjet printing method for which a processing solution is applied to a fabric when printing by applying a recording ink containing a reactive dye to the fabric, The aforementioned fabric has a diameter of less than 15 mm after 5 seconds when 0.3 g of water is dropped onto it. The aforementioned processing liquid contains urea or ethylene urea, An inkjet printing treatment method wherein the content of the adhesive contained in the treatment solution is 1% by mass or less.

2. The basis weight of the aforementioned fabric is 250 g / m². ２ The inkjet printing processing method according to claim 1, as described above.

3. The aforementioned processing liquid contains the aforementioned adhesive, The inkjet printing treatment method according to claim 1, wherein the adhesive is at least one selected from sodium alginate, carboxymethylcellulose, and starch.

4. The inkjet printing treatment method according to claim 1, characterized in that the treatment solution contains a low-viscosity water-soluble polymer.

5. The inkjet printing treatment method according to claim 4, wherein the low-viscosity water-soluble polymer is polyethylene glycol.

6. The inkjet printing treatment method according to claim 1, characterized in that the treatment solution contains an alkaline agent.

7. The inkjet printing treatment method according to claim 6, wherein the alkaline agent is potassium carbonate or potassium bicarbonate.

8. The inkjet printing treatment method according to claim 1, wherein the treatment solution does not contain an adhesive.

9. The inkjet printing treatment method according to claim 1, wherein the viscosity of the treatment solution is 3.5 mPa·s or more.

10. The inkjet printing processing method according to claim 1, wherein the recording ink does not contain an adhesive.

11. The inkjet printing treatment method according to claim 1, characterized in that the treatment solution is applied to the fabric using an inkjet head.

12. The process involves applying the processing solution to the fabric using the inkjet printing processing method described in any one of claims 1 to 11, and applying the recording ink containing the reactive dye to the fabric before or after applying the processing solution to the fabric. An inkjet printing method characterized in that the processing liquid and the recording ink are applied to the fabric using an inkjet head.

13. The inkjet printing method according to claim 12, characterized in that the fabric has not been treated with a sizing agent before the processing solution and the recording ink were applied to the fabric.

14. The processing liquid and the recording ink are discharged in any order, and the discharge volume of the processing liquid is 30 g / m². ２ The inkjet printing method according to claim 12, characterized in that it is as follows.

15. An inkjet printing method for which a processing solution is applied to a fabric when printing by applying a recording ink containing a reactive dye to the fabric, A method for inkjet printing, wherein if the diameter of the fabric after 5 seconds when 0.3 g of water is dropped onto it is 7 mm or less, a first processing solution is used as the processing solution, and if the diameter of the fabric after 5 seconds when 0.3 g of water is dropped onto it is 15 mm or more, a second processing solution having a higher sizing agent content than the first processing solution is used as the processing solution.

16. The adhesive content of the first processing liquid is 1% by mass or less. The inkjet printing treatment method according to claim 15, wherein the content of the sizing agent in the second treatment liquid is more than 1% by mass.

17. Containing urea or ethyleneurea, The adhesive content is characterized by being 1% by mass or less. A treatment solution for printing on fabrics with a diameter of 7 mm or less 5 seconds after adding 0.3 g of water.

18. An inkjet printing apparatus for use in inkjet printing, wherein the processing solution is applied to the fabric by the inkjet printing processing method described in claim 1, and a recording ink containing a reactive dye is applied to the fabric before or after the processing solution is applied to the fabric, An inkjet printing apparatus comprising a first application unit for applying the recording ink to the fabric, and a second application unit for applying a processing liquid to the fabric.

Images