Processing method for inkjet printing and inkjet printing method

Abstract

Provided is a processing method for inkjet printing, which can suppress bleeding and decrease in water absorbability at the same time when performing inkjet printing on a fabric having high water absorbability, and which can suppress cross-color. The present invention relates to a treatment method for ink jet textile printing, in which, when printing is performed by applying a recording ink containing a reactive dye to a fabric, a treatment liquid is applied to the fabric, the diameter of the fabric after 5 seconds when 0.3 g of water is dripped onto the fabric is less than 15 mm, the treatment liquid contains urea or ethylene urea, and the content of a paste contained in the treatment liquid is 1 mass% or less.

Description

TECHNICAL FIELD

[0001] The present application relates to a treatment method for inkjet printing and an inkjet printing method. BACKGROUND

[0002] In inkjet printing, in the case of direct printing on cloth, bleeding is sometimes generated. Therefore, generally, in order to prevent bleeding and improve the fixation of color materials to cloth, a pretreatment is performed on the cloth (for example, refer to Patent Documents 1 to 4). Conventionally, the pretreatment is performed on the cloth by padding. Here, in the present specification, padding means that a prescribed liquid is applied to the cloth by dipping or coating. At this time, the cloth becomes a state in which a large amount of the above-mentioned liquid is imparted. In addition, after padding, a process of drying the liquid imparted to the cloth is performed. As a pretreatment liquid, an aqueous solution containing a paste, an alkali agent, or the like is used. The paste is used to prevent bleeding, and the alkali agent is used to improve fixation, and each is contained in the aqueous solution. In addition, a method of performing a pretreatment by an inkjet method is also disclosed (for example, refer to Patent Document 5).

[0003] Cloth in which water absorbency is particularly high exists, and a pretreatment is also similarly performed on the cloth (for example, refer to Patent Documents 6 and 7).

[0004] PRIOR ART DOCUMENTS

[0005] PATENT DOCUMENTS

[0006] Patent Document 1: Japanese Patent No. 4858533

[0007] Patent Document 2: Japanese Patent No. 4710337

[0008] Patent Document 3: Japanese Patent No. 4274011

[0009] Patent Document 4: Japanese Patent No. 4623258

[0010] Patent Document 5: Japanese Laid-Open Patent Publication No. 2024-25269

[0011] Patent Document 6: Japanese Laid-Open Patent Publication No. 2010-209489

[0012] Patent Document 7: Japanese Laid-Open Patent Publication No. 2007-154017 SUMMARY

[0013] If the above-mentioned cloth in which water absorbency is particularly high is subjected to a pretreatment by padding, the following problems exist. One problem is that the cloth in which water absorbency is excellent contains a large amount of a pretreatment liquid, and thus the drying load of the cloth is large. In addition, another problem is that even after the cloth is washed, a paste contained in the pretreatment liquid remains in the cloth, and thus the water absorbency of the cloth is reduced.

[0014] The present application has been achieved in view of the above problems and situations. The present application solves the problems by providing a treatment method for inkjet printing and an inkjet printing method that can simultaneously achieve inhibition of bleeding and inhibition of reduction in water absorbency, and can inhibit color bleeding, when inkjet printing is performed on a cloth having high water absorbency.

[0015] The present inventors have conducted intensive studies on the properties of a treatment liquid when inkjet printing is performed on a cloth having high water absorbency. As a result, the present inventors have found that the conditions of a paste contained in the treatment liquid greatly affect the image state, such as bleeding, caused by the printing when inkjet printing is performed on a cloth having high water absorbency, and have completed the present application. That is, the above problems of the present application are solved by the following means.

[0016] 1. A treatment method for inkjet printing, wherein, when a cloth is printed with a recording ink containing a reactive dye, the cloth is given a treatment liquid.

[0017] the diameter of the cloth after 5 seconds when 0.3 g of water is dropped thereon is less than 15 mm,

[0018] the treatment liquid contains urea or ethylene urea,

[0019] the paste contained in the treatment liquid has a content of 1 mass% or less.

[0020] 2. The treatment method for inkjet printing according to item 1, wherein the basis weight of the cloth is 250 g / m 2 or more.

[0021] 3. The treatment method for inkjet printing according to item 1, wherein the treatment liquid contains the paste.

[0022] the paste is at least one selected from the group consisting of sodium alginate, carboxymethyl cellulose, and starch.

[0023] 4. The treatment method for inkjet printing according to item 1, characterized in that the treatment liquid contains a low-viscosity water-soluble polymer.

[0024] 5. The treatment method for inkjet printing according to item 4, wherein the low-viscosity water-soluble polymer is polyethylene glycol.

[0025] 6. The treatment method for inkjet printing according to item 1, characterized in that the treatment liquid contains an alkali agent.

[0026] 7. The treatment method for inkjet printing according to item 6, wherein the alkali agent is potassium carbonate or potassium bicarbonate.

[0027] 8. The treatment method for inkjet printing according to claim 1, wherein the treatment liquid does not contain a paste.

[0028] 9. The treatment method for inkjet printing according to claim 1, wherein the treatment liquid has a viscosity of 3.5 mPa-s or more.

[0029] 10. The treatment method for inkjet printing according to claim 1, wherein the recording ink does not contain a paste.

[0030] 11. The treatment method for inkjet printing according to claim 1, wherein the treatment liquid is applied to the fabric using an inkjet head.

[0031] 12. An inkjet printing method, wherein the treatment liquid is applied to the fabric using the treatment method for inkjet printing according to any one of claims 1 to 11, and the recording ink containing the reactive dye is applied to the fabric before or after the treatment liquid is applied to the fabric.

[0032] The treatment liquid and the recording ink are applied to the fabric using an inkjet head.

[0033] 13. The inkjet printing method according to claim 12, wherein the fabric is not applied with a paste before the treatment liquid and the recording ink are applied to the fabric.

[0034] 14. The inkjet printing method according to claim 12, wherein the treatment liquid and the recording ink are ejected in any order, and the amount of the treatment liquid ejected is 30 g / m 2 or more.

[0035] 15. A treatment method for inkjet printing, wherein a treatment liquid is applied to a fabric when the fabric is printed with a recording ink containing a reactive dye.

[0036] When the diameter of the fabric 5 seconds after 0.3 g of water is dropped on the fabric is 7 mm or less, a first treatment liquid is used as the treatment liquid, and when the diameter of the fabric 5 seconds after 0.3 g of water is dropped on the fabric is 15 mm or more, a second treatment liquid containing a paste at a rate greater than the first treatment liquid is used as the treatment liquid.

[0037] 16. The treatment method for inkjet printing according to claim 15, wherein

[0038] the first treatment liquid contains the paste at a rate of 1 mass% or less,

[0039] and the second treatment liquid contains the paste at a rate greater than 1 mass%.

[0040] 17. A treatment liquid for use in inkjet printing on a cloth or fabric having a diameter of 7 mm or less, wherein the treatment liquid contains urea or ethylene urea.

[0041] The paste is contained at a content of 1 mass% or less.

[0042] 18. An inkjet printing apparatus for inkjet printing by applying the treatment liquid for inkjet printing according to claim 1 to a cloth or fabric, and applying a recording ink containing a reactive dye to the cloth or fabric before or after the application of the treatment liquid to the cloth or fabric.

[0043] The inkjet printing apparatus includes a first application unit for applying the recording ink to the cloth or fabric, and a second application unit for applying the treatment liquid to the cloth or fabric.

[0044] According to the present application, it is possible to provide an inkjet printing method and a treatment method for inkjet printing, which can simultaneously achieve inhibition of bleeding and inhibition of reduction in water absorbency when inkjet printing is performed on a cloth or fabric having high water absorbency, and can inhibit color bleeding.

[0045] The mechanism of action or the mechanism of action of the effects of the present application is not clear, but is presumed as follows.

[0046] It is presumed that if a recording ink is applied to a cloth or fabric having high water absorbency, the speed of penetration in the thickness direction of the cloth or fabric is fast, and the degree of expansion of bleeding on the surface of the cloth or fabric becomes small. Therefore, the necessity of containing a paste for inhibiting bleeding in the pretreatment liquid is reduced when a recording ink is applied to a cloth or fabric having high water absorbency. Here, it is presumed that if the amount of paste remaining on the cloth or fabric increases, the water absorbency decreases. On the contrary, if the content of paste in the pretreatment liquid decreases, the amount of paste remaining on the cloth or fabric also decreases, and the reduction in water absorbency of the cloth or fabric can be inhibited. Thus, it is presumed that by controlling the content of paste in the treatment liquid when inkjet printing is performed on a cloth or fabric having high water absorbency, inhibition of bleeding and inhibition of reduction in water absorbency can be simultaneously achieved.

[0047] Furthermore, if the amount of paste remaining on the cloth or fabric decreases, the amount of color material adsorbed to the paste also decreases. Therefore, it is presumed that color bleeding caused by color material adsorbed to the paste is inhibited in the cleaning process after the application of the recording ink to the cloth or fabric. BRIEF DESCRIPTION OF DRAWINGS

[0048] Figure 1 is a flowchart showing the inkjet printing method of the present embodiment.

[0049] Figure 2 is a schematic diagram showing an inkjet printing apparatus used in the inkjet printing method of the present embodiment.

[0050] SYMBOL EXPLANATION

[0051] 1 Inkjet printing device

[0052] 10 Medium conveying section

[0053] 11, 12 Conveying rollers

[0054] 13 Belt

[0055] 20 Ink supply section

[0056] 21 Inkjet head

[0057] 21a Inkjet head for processing liquid

[0058] 21b Inkjet head for recording ink

[0059] 22 Carriage

[0060] 22a First carriage

[0061] 22b Second carriage

[0062] 100 Fabric

[0063] 200 Processing liquid or recording ink

[0064] 200a Processing liquid

[0065] 200b Recording ink

[0066] [x] Conveying direction

[0067] S01 Application of processing liquid

[0068] S02 Application of recording ink

[0069] S03 Steam treatment

[0070] S04 Washing treatment

[0071] S05 Drying treatment DETAILED DESCRIPTION

[0072] 1. Inkjet printing method

[0073] One embodiment of the treatment method for inkjet printing according to the present application is a treatment method in which a treatment liquid is applied to a cloth when printing is performed on the cloth using a recording ink containing a reactive dye. Furthermore, the diameter of the cloth after 5 seconds when 0.3 g of water is dropped on the cloth is less than 15 mm. Furthermore, the treatment liquid contains urea or ethylene urea, and the content of a paste contained in the treatment liquid is 1% by mass or less. The treatment method for inkjet printing according to the present embodiment has the following effects because of the above-described configuration. That is, when inkjet printing is performed on a cloth having high water absorbency, both bleeding and reduction in water absorbency can be suppressed. Furthermore, bleeding caused by a color material adsorbed to a paste can be suppressed. Note that the treatment method for inkjet printing according to the present embodiment can be performed before or after the cloth is applied with the recording ink. In addition, the recording ink preferably does not contain a paste. By not containing a paste in the recording ink, reduction in water absorbency of the cloth can be suppressed.

[0074] In the treatment method for inkjet printing according to the present embodiment, it is preferable that the treatment liquid be applied to the cloth without performing a pretreatment by a conventional padding method, and the treatment liquid be applied to the cloth using an inkjet head without applying a pretreatment liquid to the cloth. In the case where a pretreatment is performed on a cloth having particularly high water absorbency using a padding method, the following problems further occur. That is, the pretreatment takes a long time, which results in a delay in delivery of a product obtained by printing. In addition, a cost for the pretreatment process is required. In addition, the pretreated cloth deteriorates over time and cannot be stored for a long period. In contrast, by applying the treatment liquid to the cloth using an inkjet head, the time for the pretreatment can be shortened, and the delivery of the product can be accelerated. In addition, since the amount of the treatment liquid used is reduced, the cost for the pretreatment process can be reduced. In addition, since the interval between the application of the treatment liquid and the application of the recording ink is short, deterioration of the pretreated cloth over time can be suppressed, and the pretreated cloth can be stored for a long period.

[0075] In addition, in the pretreatment by the padding method, since the treatment liquid is applied to the entire surface of the cloth, the amount of the treatment liquid absorbed by the cloth is large. In particular, the amount of the treatment liquid absorbed by the cloth is large in a cloth having excellent water absorbency. Therefore, the drying load when the treatment liquid is dried is large. In addition, in a washing process as a post-treatment process of inkjet printing, a large amount of cleaning liquid and a long cleaning time are required in order to remove the treatment liquid. In contrast, by applying the treatment liquid to the cloth using an inkjet head, the amount of the treatment liquid absorbed by the cloth can be controlled, and the drying load can be reduced. In addition, in the above-described washing process, the amount of the cleaning liquid can be reduced, and the cleaning time can be shortened, and thus the cleaning process can be simplified. In addition, in the padding method, uneven application of a paste can occur, and color fluctuation can occur in inkjet printing. In contrast, by applying the treatment liquid to the cloth using an inkjet head, such color fluctuation can be suppressed.

[0076] In addition, in the pretreatment of the padding method, the amount of the treatment liquid absorbed by the cloth is large as described above, and the drying load is large. In contrast, in the method of applying the treatment liquid to the cloth using the inkjet head, since the treatment liquid does not need to be dried or is dried to a small extent, the drying load can be reduced. The method of applying the recording ink to the cloth without drying the cloth after the treatment liquid is applied to the cloth is sometimes referred to as the "Wet on Wet method". This also includes the case where the recording ink is applied to the cloth and the treatment liquid is applied to the cloth without drying the cloth. In the "Wet on Wet method", when the recording ink is applied to the cloth while the cloth is wet, the recording ink easily penetrates the cloth, and thus, the white background is not easily seen in a white cloth having a large amount of absorption.

[0077] In addition, the viscosity of the treatment liquid is preferably 3.5 mPa-s or more, further preferably 3.5 to 10.0 mPa-s, and particularly preferably 3.5 to 8.0 mPa-s. By making the viscosity of the treatment liquid 3.5 mPa-s or more, the ejection property when the treatment liquid is ejected from the inkjet head is made good.

[0078] In addition, when the treatment liquid is applied to the cloth using the inkjet head, the ejection amount of the treatment liquid is preferably 30 g / m 2 The ejection amount of the treatment liquid described above is further preferably 5 to 20 g / m 2 By making the ejection amount of the treatment liquid 30 g / m 2 , there is an advantage of suppressing the bleeding when the treatment liquid is deposited.

[0079] In addition, the ejection method of the treatment liquid of the inkjet head used for applying the treatment liquid is not particularly limited. The ejection method can be selected from various methods such as the piezoelectric method, the thermal ejection method, and the continuous inkjet method. The piezoelectric method and the continuous inkjet method have a high possibility of stably ejecting even the treatment liquid containing a high molecular material, and thus are preferred. In particular, the piezoelectric method is small and has a high degree of integration, and thus is preferred.

[0080] <cloth>

[0081] In the treatment method for inkjet printing according to the present embodiment, the cloth has a diameter of less than 15 mm 5 seconds after 0.3 g of water is dropped thereon. In the present specification, such a cloth is sometimes referred to as "highly water-absorptive cloth". The diameter is preferably 14 mm or less, and further preferably 5 mm or less. The cloth treated by the treatment method for inkjet printing according to the present embodiment has a diameter of less than 15 mm, and thus has high water-absorptive property, and bleeding of recording ink applied to the cloth can be suppressed. The 0.3 g of water is dropped on the spread cloth from a position 10 mm above the cloth. The diameter of water when the water is dropped on the cloth is the wet spreading diameter of water on the cloth, and is a value obtained by measuring a portion having the largest diameter in a range of the cloth surface wetted by water. The diameter of water is an average of measured values obtained by measuring 10 times. Further, the smaller the diameter of the cloth 5 seconds after 0.3 g of water is dropped thereon, the higher the water-absorptive property, and it is considered that 2 mm or so is a lower limit value.

[0082] The basis weight of the highly water-absorptive cloth is preferably 250 g / m 2 or more. Further, the basis weight is further preferably 250 to 450 g / m 2 , and particularly preferably 350 to 450 g / m 2 . By the basis weight of the highly water-absorptive cloth being 250 g / m 2 or more, the water-absorptive property of the cloth is further higher, and bleeding of recording ink applied to the cloth can be further suppressed.

[0083] The material of the highly water-absorptive cloth is not particularly limited. As the material of the highly water-absorptive cloth, cotton, silk, hemp, wool, nylon fiber, rayon fiber, and a blend thereof can be given. Cotton is preferred. By the material being cotton, the water-absorptive property of the cloth is further higher, and bleeding of recording ink applied to the cloth can be further suppressed. The highly water-absorptive cloth is preferably a cloth to which a paste has not been applied. That is, it is preferred that the treatment liquid and recording ink are applied to a cloth to which a paste has not been attached. By the paste not being attached to the cloth, a decrease in water-absorptive property of the cloth due to the paste can be prevented.

[0084] Further, as the towel fabric, a "terry cloth" in which loops as pile fibers are not cut, and a "cut pile cloth" in which loops are cut can be given.

[0085] < Treatment Liquid >

[0086] [Humectant]

[0087] In the treatment method for inkjet printing of the present embodiment, the treatment liquid contains urea or ethylene urea. The treatment liquid containing urea or ethylene urea also includes a case where both urea and ethylene urea are contained. Urea and ethylene urea are contained in the treatment liquid as a humectant. The humectant can promote the fixation of the reactive dye on the recording medium by steam in the color development process based on steam after image formation. Also, thereby, the color development density can be improved. In particular, ethylene urea is less likely to be hydrolyzed in the case where the treatment liquid is alkaline, and is preferable in terms of excellent long-term storage properties. The content of the humectant in the treatment liquid is preferably 10% by mass or more. Further, the content of the humectant in the treatment liquid is preferably 10 to 30% by mass, and more preferably 15 to 25% by mass. By being within the above range, sufficient dyeability or color developability can be ensured, and sufficient ejection from the inkjet head can be ensured.

[0088] In addition, when the treatment liquid is ejected using the inkjet head, urea and ethylene urea moisturize the nozzle surface of the inkjet head, and thus the ejection property can be improved.

[0089] 〔Paste〕

[0090] In addition, in the treatment method for inkjet printing of the present embodiment, the content of the paste contained in the treatment liquid is 1% by mass or less. The content of the paste contained in the treatment liquid is preferably 0.5% by mass or less. Further, most preferably, the content of the paste in the treatment liquid is 0% by mass, that is, the treatment liquid does not contain the paste. By the content of the paste in the treatment liquid being 1% by mass or less, the decrease in the water absorbency of the cloth caused by the paste can be prevented. In addition, the treatment method for inkjet printing of the present embodiment is because the cloth is the above high water absorbency cloth, and thus even if the content of the paste in the treatment liquid is 1% by mass or less, the bleeding of the cloth can be suppressed. In the present specification, the paste is a water-soluble polymer having a viscosity of 4 to 100 mPa-s at 25°C in a 1% by mass aqueous solution.

[0091] In addition, when the treatment liquid contains the paste, as the paste contained in the treatment liquid, at least one selected from the group consisting of sodium alginate, carboxymethyl cellulose, and starch is preferable.

[0092] In addition, since the content of the paste contained in the treatment liquid is 1% by mass or less, the color bleeding caused by the recording ink adsorbed to the paste can be suppressed.

[0093] In addition, in the case where the treatment liquid is ejected from the inkjet head, it is preferable that the content of the paste in the treatment liquid is small. If the treatment liquid contains the paste, the nozzle surface of the inkjet head is dried and thickened by the action of the paste, and the ejection property is deteriorated. Therefore, by the content of the paste in the treatment liquid being small, the ejection property of the treatment liquid is improved. That is, by the treatment liquid containing the above humectant and the content of the paste being small, the ejection property when the treatment liquid is ejected from the inkjet head is improved.

[0094] 〔Other components〕

[0095] The treatment liquid preferably further contains a solvent, a water-soluble polymer, an alkali agent, a surfactant, a preservative, water, and the like. In addition, it is also preferable that the treatment liquid contain a color ink and that the color ink contain a reactive dye.

[0096] (Solvent)

[0097] The solvent contained in the treatment liquid is preferably a general water-soluble organic solvent. As the solvent, for example, alcohols, polyhydric alcohols, glycol ethers, amines, amides, heterocyclic compounds, sulfoxides, and the like can be given. Further, as the alcohols, for example, methanol, ethanol, propanol, isopropanol, butanol, isobutanol, sec-butanol, tert-butanol, and the like can be given. As the polyhydric alcohols, for example, ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, polypropylene glycol, butylene glycol, hexylene glycol, pentylene glycol, glycerol, hexanetriol, thiodiglycol, and the like can be given. As the glycol ethers, for example, ethylene glycol alkyl ether, diethylene glycol alkyl ether, triethylene glycol alkyl ether, propylene glycol alkyl ether, dipropylene glycol alkyl ether, tripropylene glycol alkyl ether, and the like can be given. As the amines, for example, ethanolamine, diethanolamine, triethanolamine, N-methyldiethanolamine, N-ethyldiethanolamine, morpholine, N-ethylmorpholine, ethylenediamine, diethylenediamine, triethylenetetramine, tetraethylenepentamine, polyethyleneimine, pentamethyldiethyltriamine, tetramethylpropylenediamine, and the like can be given. As the amides, for example, formamide, N,N-dimethylformamide, N,N-dimethylacetamide, and the like can be given. As the heterocyclic compounds, for example, 2-pyrrolidone, N-methyl-2-pyrrolidone, cyclohexylpyrrolidone, 2-oxazolidone, 1,3-dimethyl-2-imidazolidinone, and the like can be given. As the sulfoxides, for example, dimethyl sulfoxide, and the like can be given.

[0098] The content ratio of the solvent contained in the treatment liquid is preferably 5 to 40% by mass.

[0099] (Low-viscosity water-soluble polymer)

[0100] The low-viscosity water-soluble polymer contained in the treatment liquid can adjust the viscosity of the treatment liquid. In the case of ejecting the treatment liquid from an inkjet head, by containing the low-viscosity water-soluble polymer in the treatment liquid, the ejection property of the treatment liquid from the inkjet head can be improved. The low-viscosity water-soluble polymer is a water-soluble polymer having a lower viscosity than a paste. Specifically, the low-viscosity water-soluble polymer is a water-soluble polymer having a viscosity of less than 4 mPa-s at 25°C in a 1% by mass aqueous solution. Here, in the present application, the "water-solubility" of the "water-soluble polymer" means that the solubility of the object substance is 5 parts by mass or more with respect to 100 parts by mass of water at 25°C. By making the polymer water-soluble, it can be used for water-based treatment inks.

[0101] ​As the low viscosity water-soluble polymer, polyvinylpyrrolidone, polyethylene glycol, an ethylene oxide-propylene oxide copolymer, a polyethylene oxide adduct of glycerol, a polypropylene adduct of glycerol, a polyethylene oxide adduct of diglycerol, a polypropylene adduct of diglycerol, and the like can be given.

[0102] The content of the low viscosity water-soluble polymer in the treatment liquid is preferably 10% by mass or less. The treatment liquid can not contain the low viscosity water-soluble polymer without viscosity adjustment.

[0103] (Basic agent)

[0104] The basic agent contained in the treatment liquid can promote fixation of the reactive dye contained in the recording ink on the recording medium. Also, thereby the color development density of the reactive dye can be improved. Such a basic agent is at least one of a carbonate and a bicarbonate. In addition, the carbonate and the bicarbonate are preferably at least one of a sodium salt and a potassium salt, respectively. Also, as the basic agent, potassium carbonate or potassium bicarbonate is particularly preferable. These basic agents are less likely to be precipitated from the treatment liquid, and thus, when the treatment liquid is ejected from the inkjet head, the ejection of the treatment liquid from the inkjet head can be stabilized.

[0105] The content of the basic agent contained in the treatment liquid is preferably 10% by mass or less. Further, the content of the basic agent contained in the treatment liquid is further preferably 3 to 10% by mass, and particularly preferably 4 to 8% by mass. By being in the above range, sufficient dyeability or color developability can be ensured, and sufficient ejection from the inkjet head can be ensured. In addition, the treatment liquid is basic because it contains the basic agent, and thus, the hydrogen ion concentration index (pH) at 25°C is preferably 10 or less. The hydrogen ion concentration index (pH) at 25°C of the treatment liquid is further preferably 9 to 10.

[0106] (Surfactant)

[0107] The surfactant can use any one of cationic, anionic, amphoteric, and nonionic.

[0108] As the cationic surfactant, for example, aliphatic amine salts, aliphatic quaternary ammonium salts, benzalkonium chloride salts, benzethonium chloride, pyridinium salts, imidazolium salts, and the like can be given.

[0109] As anionic surfactants, for example, fatty acid soaps, N-acyl-N-methylglycinate salts, N-acyl-N-methyl-β-alaninate salts, N-acyl glutamate salts, alkyl ether carboxylate salts, acylated peptides, alkyl sulfonate salts, alkylbenzenesulfonate salts, alkylnaphthalenesulfonate salts, dialkylsulfosuccinate salts, alkylsulfobutyrate salts, α-olefin sulfonate salts, N-acylmethyltaurinate salts, sulfated oils, higher alcohol sulfate salts, secondary higher alcohol sulfate salts, alkyl ether sulfate salts, secondary higher alcohol ethoxysulfate salts, polyoxyethylene alkylphenyl ether sulfate salts, monoglyceryl sulfate salts, fatty acid alkylolamide sulfate salts, alkyl ether phosphate salts, alkyl phosphate salts, and the like can be given.

[0110] As amphoteric surfactants, for example, carboxybetaine type, sulfobetaine type, aminocarboxylate salts, imidazolinium betaine, and the like can be given.

[0111] As nonionic surfactants, for example, polyoxyethylene alkyl ethers, polyoxyethylene secondary alcohol ethers, polyoxyethylene alkylphenyl ethers (for example, Emulgen 911), polyoxyethylene sterol ethers, polyoxyethylene lanolin derivatives, polyoxyethylene polyoxypropylene alkyl ethers (for example, Newpol PE-62, manufactured by Sanyo Chemical Industries, Inc.), 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 alkylolamides, polyoxyethylene fatty acid amides, polyoxyethylene alkylamines, alkylamine oxides, acetylenic diols, acetylenic alcohols, and the like can be given.

[0112] These surfactants can be used alone or in combination of two or more. The surfactant is preferably added in a range of 0.001 to 1.0% by mass with respect to the total mass of the treatment liquid.

[0113] (Preservatives)

[0114] The treatment liquid can be inhibited from deteriorating at the time of storage by containing a preservative, and the storage time can be extended. As the preservative, for example, aromatic halogen compounds, methylene dithiocyanate, halogen-containing nitrogen sulfur compounds, 1,2-benzisothiazolin-3-one, and the like can be given. The preservative can also be used as a commercial product. As the preservative of the commercial product, "Preventol (registered trademark) CMK" (aromatic halogen compound, manufactured by Bayer) can be given. In addition, "PROXEL (registered trademark) GXL" (1,2-benzisothiazolin-3-one, manufactured by ICI) can be given.

[0115] (Water)

[0116] As the water, ion-exchange water, ultrafiltration water, reverse osmosis water, distilled water, pure water, ultrapure water, and the like can be used. In addition, by using water that has been sterilized by ultraviolet irradiation or hydrogen peroxide or the like, the generation of mold and bacteria can be prevented in the case of long-term storage of the treatment liquid. The water content ratio in the treatment liquid is preferably 55 to 80 mass%. By making the water content ratio in the treatment liquid within this range, the solid components can be sufficiently dissolved, and the solubility of the treatment ink can be improved.

[0117] Note that the treatment liquid containing each of the materials as described above preferably does not contain an anti-reducing agent (sodium m-nitrobenzenesulfonate). Thereby, the precipitation of the anti-reducing agent having low solubility can be prevented, and the storage properties of the treatment liquid can be improved.

[0118] 2. Second inkjet printing treatment method

[0119] The second mode of the inkjet printing treatment method of the present application is an inkjet printing treatment method in which a treatment liquid is applied to a cloth when printing is performed on the cloth using a recording ink containing a reactive dye, and in which, in the case where the diameter of the cloth after 5 seconds from the time when 0.3 g of water is dropped thereon is 7 mm or less, a first treatment liquid is used as the treatment liquid. Also, in the case where the diameter of the cloth after 5 seconds from the time when 0.3 g of water is dropped thereon is 15 mm or more, a second treatment liquid having a higher paste content ratio than the first treatment liquid is used as the treatment liquid. Thereby, it is possible to switch the type of the treatment liquid applied to a plurality of cloths having different water absorption properties, and to provide a printed product that is optimal in terms of bleeding, color bleeding, and water absorption for each cloth. That is, it is possible to perform inkjet printing treatment while switching the plurality of cloths having different water absorption properties, and to switch the treatment liquid to a treatment liquid having a paste content ratio that matches each cloth. Thereby, the inkjet printing performed by the second inkjet printing treatment method can be performed in a manner that is suitable for the cloth.

[0120] In the second inkjet printing treatment method of the present embodiment, a cloth having a diameter of 7 mm or less after 5 seconds from the time when 0.3 g of water is dropped thereon is sometimes referred to as a "diameter 7 mm cloth". Also, a cloth having a diameter of 15 mm or more after 5 seconds from the time when 0.3 g of water is dropped thereon is sometimes referred to as a "diameter 15 mm cloth".

[0121] The second inkjet printing treatment method of the present embodiment uses the first treatment liquid in the case where the cloth is a "diameter 7 mm cloth", and uses the second treatment liquid in the case where the cloth is a "diameter 15 mm cloth", as described above. The second inkjet printing treatment method of the present embodiment is the same as the inkjet printing treatment method of the present embodiment described above, except that the treatment liquid is switched in correspondence with the water absorption properties of the cloth. Also, in the case where the diameter of the cloth after 5 seconds from the time when 0.3 g of water is dropped thereon is greater than 7 mm and less than 15 mm, either the first treatment liquid or the second treatment liquid is preferably used, and they can also be used in combination.

[0122] In the second inkjet printing and dyeing treatment method of this embodiment, the conditions of the first treatment liquid are the same as those of the treatment liquid in the inkjet printing and dyeing treatment method of this embodiment described above. Furthermore, the conditions of the second treatment liquid are the same as those of the first treatment liquid, except that the paste content is greater than 1% by mass. The paste content in the second treatment liquid is preferably greater than 1% by mass, and more preferably greater than 1% by mass and less than 5% by mass.

[0123] 3. Treatment fluid

[0124] One embodiment of the treatment liquid of the present invention is a treatment liquid specifically designed for fabrics with a diameter of 7 mm or less after 5 seconds of printing with 0.3 g of water. Furthermore, the treatment liquid of this embodiment contains urea or ethylurea, and the content of the paste is 1% by mass or less. The conditions of the treatment liquid of this embodiment are the same as those of the treatment liquid used in the inkjet printing treatment method of the present embodiment described above.

[0125] Another aspect of the processing liquid of the present invention is a processing liquid specifically designed for dyeing fabrics with a diameter of 15 mm or more after 5 seconds of applying 0.3 g of water. Another aspect of the processing liquid of the present invention is a processing liquid containing urea or ethylurea and having a paste content greater than 1% by mass. Another aspect of the processing liquid of the present invention is the same as the processing liquid used in the inkjet printing processing method of this embodiment, except that the paste content is greater than 1% by mass.

[0126] 4. Inkjet printing method

[0127] One embodiment of the inkjet printing method of the present invention involves applying the treatment liquid to the fabric using the inkjet printing treatment method of this embodiment, and applying the recording ink containing the reactive dye to the fabric before or after applying the treatment liquid. Furthermore, an inkjet head can be used to apply both the treatment liquid and the recording ink to the fabric. Therefore, when inkjet printing is performed on highly absorbent fabrics, both suppression of bleeding and suppression of reduced absorbency can be achieved simultaneously, thus suppressing color bleeding.

[0128] The inkjet printing method of this embodiment is as follows: Figure 1 The process shown includes: "applying treatment liquid S01" to the fabric, "applying recording ink S02" to the fabric, and "steam treatment S03" to treat the fabric with steam. The inkjet printing method of this embodiment may further include "washing treatment S04" to wash the fabric and "drying treatment S05" to dry the fabric. Figure 1 This is a flowchart illustrating the inkjet printing method of this embodiment.

[0129] The inkjet printing method of this embodiment preferably does not apply a paste to the fabric before applying the treatment liquid and recording ink. This suppresses the decrease in absorbency of highly absorbent fabrics caused by the paste, and prevents color bleeding.

[0130] In this embodiment, the inkjet printing method preferably involves ejecting the processing liquid and the recording ink in any order, and the ejection volume of the processing liquid is 30 g / m³. 2 The phrase "ejecting the processing liquid and recording ink in any order" refers to both cases where the recording ink is ejected from the fabric after the processing liquid has been ejected and cases where the processing liquid is ejected from the fabric after the recording ink has been ejected, and either case is acceptable. Furthermore, it also includes methods where the processing liquid and recording ink are ejected randomly from each inkjet head. Since the inkjet printing method of this embodiment is used to print on the aforementioned highly absorbent fabric, it can suppress bleeding caused by the recording ink. Therefore, from the viewpoint of suppressing bleeding, it is not necessary to eject the processing liquid before the recording ink is ejected. Thus, the processing liquid can be ejected before the recording ink, after the recording ink, or even randomly.

[0131] The inkjet printing method of this embodiment will now be described in more detail with reference to the accompanying drawings.

[0132] <Inkjet Printing Equipment>

[0133] Figure 2 This is a schematic diagram of the inkjet printing apparatus used in the inkjet printing method of this embodiment. The inkjet printing apparatus 1 includes a media transport unit 10 with a conveying method and an ink supply unit 20 with an inkjet method.

[0134] The media conveying unit 10 includes a plurality of conveying rollers 11 and 12, and an annular belt 13 wound around the conveying rollers 11 and 12. One of the plurality of conveying rollers 11 and 12 is a drive roller for rotating the annular belt 13. The outer peripheral surface of the belt 13 is adhesive, and a cloth 100 serving as a recording medium is held on the upper part of the outer peripheral surface. Thus, the media conveying unit 10 is configured to convey the cloth 100 held on the belt 13 in the conveying direction [x] in the rotation direction of the belt 13.

[0135] The ink supply unit 20 includes multiple inkjet heads 21 that eject processing liquid or recording ink 200 from the fabric 100 held by the media transport unit 10. Each inkjet head 21 has a first applicator for applicating recording ink to the fabric 100 and a second applicator for applicating processing liquid to the fabric 100. These inkjet heads 21 eject processing liquid or recording ink 200 from multiple ink ejection openings toward the fabric 100. Each inkjet head 21 is mounted on a carriage 22 that reciprocates in a transport width direction perpendicular to the transport direction [x] of the fabric 100, ejecting processing liquid or recording ink 200 in the transport width direction. It should be noted that one carriage 22 can mount multiple inkjet heads 21.

[0136] Processing liquid or recording ink 200 ejected from each inkjet head 21 drips onto the fabric 100 conveyed by the media transport unit 10. Among these inkjet heads 21, the inkjet head mounted on the first carriage 22a, which is located at the upstream side of the transport direction [x], is used as a processing liquid inkjet head 21a. Moreover, the processing liquid inkjet head 21a is filled with processing liquid 200a and ejects the processing liquid 200a. In addition, among these inkjet heads 21, the inkjet head mounted on the second carriage 22b, which is located at the downstream side of the transport direction [x], is used as a recording ink inkjet head 21b. Moreover, the recording ink inkjet head 21b is filled with recording ink 200b and ejects the recording ink 200b. Furthermore, among these inkjet heads 21, the inkjet head located at the downstream side of the transport direction [x] can be used as a post-processing inkjet head (not shown) and filled with processing liquid 200a as post-processing ink to eject functional ink 200a.

[0137] The inkjet printing apparatus 1 is capable of ejecting recording ink 200b from the inkjet head 21b onto the fabric 100, which has been given the state of the processing liquid 200a by dripping.

[0138] It should be noted that, Figure 2 Only one inkjet head 21b is shown in the diagram, but inkjet heads 21b can also be configured to correspond to each color of the ink being recorded. Preferably, each inkjet head 21b corresponding to each color of the ink is mounted on the same carriage 22.

[0139] Furthermore, the preferred inkjet head 21a can switch between applying multiple processing liquids. The inkjet head 21a can switch between applying multiple processing liquids by changing the processing liquid. Additionally, the inkjet head 21a can have multiple inkjet heads, allowing the application of multiple processing liquids to be switched by filling each inkjet head with a different processing liquid. For example, when switching between using a first processing liquid and a second processing liquid, an inkjet head for both the first and second processing liquids can be provided. It should be noted that the processing liquid can also be applied to the fabric via impregnation or the like instead of using an inkjet head. In this case, a processing liquid coating apparatus based on impregnation or the like can be used to switch the processing liquid, or multiple processing liquid coating apparatuses can be used to switch the processing liquid.

[0140] Furthermore, there is no particular limitation on the way the ink is ejected from the inkjet head 21. This ejection method is the same as the ejection method described as the ejection method of the processing liquid in the inkjet head used to impart the aforementioned processing liquid.

[0141] Additionally, although the illustration is omitted, the inkjet printing apparatus 1 may also include a drying mechanism between the inkjet head 21a for the processing liquid and the inkjet head 21b for the recording ink. This drying mechanism allows the functional ink 200a, which is applied to the fabric 100, to be dried before the recording ink 200b is applied. Since the inkjet printing method of this embodiment uses a highly absorbent fabric as the recording medium, ink bleeding of the recording ink can be suppressed, thus eliminating the need for drying after applying the processing liquid to the fabric. However, to further prevent bleeding, the fabric can also be dried. The drying of the processing liquid 200a based on the drying mechanism is preferably performed to remove as much moisture and solvent as possible from the processing liquid 200a applied to the fabric 100, to the extent that bleeding of the subsequent recording ink 200b can be prevented.

[0142] Therefore, the drying mechanism preferably sets the surface temperature of the recording medium 100 within a range of 30°C to 80°C to suit the temperature settings of each component of the processing liquid 200a for drying treatment. Such a drying mechanism can be appropriately selected from those using temperature-controlled air or warm air, those using hot plates, those using visible or far-infrared light, those using heated rollers, and those using microwave irradiation, etc. Furthermore, when a drying mechanism is provided, it is preferable to include an exhaust stack and a fan for removing vapors generated during drying from the apparatus.

[0143] Alternatively, the inkjet head 21a for processing liquid and the inkjet head 21b for recording ink may be disposed in the transport width direction perpendicular to the transport direction [x] of the processing liquid 100, instead of being mounted on the carriage 22.

[0144] <Recording Media>

[0145] The recording medium is fabric 100. Fabric 100 is a highly absorbent fabric used in the inkjet printing and dyeing processing method of this embodiment.

[0146] <Recording Ink>

[0147] In the inkjet printing method of this embodiment, conventional inks of various colors containing reactive dyes can be used as recording inks. For example, the recording ink contains reactive dyes and also contains pure water such as ion-exchanged water, solvents, surfactants, inorganic salts, preservatives, etc. The solvents, surfactants, and preservatives can be the same materials as those contained in the treatment liquid in the inkjet printing treatment method of this embodiment described above.

[0148] [Reactive dyes]

[0149] Reactive dyes can be any common type of reactive dye. Both addition-reactive and substitution-reactive dyes can be used. Reactive dyes having a monochlorotriazine group as a reactive group are particularly preferred. Specific compounds of reactive dyes preferably used in the inkjet printing method of this embodiment are shown below. Reactive dyes are not limited to these illustrated compounds.

[0150] In the inkjet printing method of this embodiment, the preferred reactive dyes include:

[0151] CI Active 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

[0152] CI Active 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

[0153] CI Reactive 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, 120, 123, 124, 128, 130, 136, 141, 147, 158, 159, 171, 174, 180, 183, 184, 187, 190, 193, 194, 195, 198, 218, 220, 222, 223, 226, 228, 235

[0154] CI Reactive Violet 1, 2, 4, 5, 6, 22, 23, 33, 36, 38

[0155] CI Reactive Blue 2, 3, 4, 7, 13, 14, 15, 19, 21, 25, 27, 28, 29, 38, 39, 41, 49, 50, 52, 63, 69, 71, 72, 77, 79, 89, 104, 109, 112, 113, 114, 116, 119, 120, 122, 137, 140, 143, 147, 160, 161, 162, 163, 168, 171, 176, 182, 184, 191, 194, 195, 198, 203, 204, 207, 209, 211, 214, 220, 221, 222, 231, 235, 236

[0156] CI Active Green 8, 12, 15, 19, 21

[0157] CI Active Brown 2, 7, 9, 10, 11, 17, 18, 19, 21, 23, 31, 37, 43, 46; CI Active Black 5, 8, 13, 14, 31, 34, 39, etc.

[0158] The reactive dye content in the recording ink is preferably 0.1 to 20% by mass, more preferably 0.2 to 13% by mass.

[0159] [Inorganic salts]

[0160] Inorganic salts are added to recording inks to maintain their viscosity and stabilize reactive dyes. Examples of such inorganic salts include sodium chloride, sodium sulfate, magnesium chloride, and magnesium sulfate. However, the choice of inorganic salt is not limited to these examples.

[0161] <Inkjet Printing Methods>

[0162] The inkjet printing method of this embodiment is implemented using the inkjet printing apparatus 1 described above. In this case, firstly, a fabric 100 is prepared as a recording medium. This fabric 100 is a highly absorbent fabric. In addition, the fabric 100 is preferably a fabric that has been pre-washed to remove residual components (paste, etc.) and stains from the chemicals used in the manufacturing process. Next, the fabric 100 is moved in the conveying direction [x] by rotating the conveying rollers 11 and 12.

[0163] While moving the fabric 100 in the transport direction [x], processing liquid 200a is ejected from the processing liquid inkjet head 21a of the ink supply unit 20 and dripped onto the fabric 100 (applying processing liquid S01). Thus, the portion of the fabric 100 to which the processing liquid 200a is applied becomes a pre-treated portion. At this time, it is preferable that the amount of processing liquid applied to the fabric 100 is 30 g / m². 2 The following steps can suppress ink bleeding during dripping. Then, the functional ink 200a dripped onto the recording medium 100 can be dried as needed. It should be noted that using an inkjet head to drip the processing liquid or recording ink onto the fabric applies the processing liquid or recording ink to the fabric.

[0164] Next, the area on the fabric 100 where the processing liquid 200a is dripped is designated as the pretreatment area. Then, recording ink 200b is ejected from the ink supply unit 20 using the inkjet head 21b, causing the recording ink 200b to drip onto the pretreatment area (applying recording ink SO2). As a result, the reactive dye contained in the recording ink 200b is fixed onto the fabric 100 to form an image.

[0165] Furthermore, after an image is formed based on the recording ink 200b, the fabric 100 is subjected to a steam treatment S03 to promote the fixing of the reactive dye onto the fabric 100. This process of fixing the reactive dye onto the fabric via steam treatment S03 is also referred to as the color development process. Then, the fabric 100 with the fixed reactive dye is subjected to a washing treatment S04 and a drying treatment S05, thus concluding the inkjet printing method (see reference). Figure 1 ).

[0166] Washing is the process of using a detergent to clean fabric and then rinsing it with water. There are no particular limitations on the detergent, as long as it can remove the residue from the fabric. It can be any ordinary laundry detergent.

[0167] Drying can be carried out by contact with heated rollers or by placing the product in a dryer.

[0168] 5. Inkjet printing and dyeing equipment

[0169] One embodiment of the inkjet printing apparatus of the present invention is an inkjet printing apparatus for inkjet printing, wherein the inkjet printing apparatus applies a treatment liquid to the fabric using the inkjet printing treatment method of this embodiment described above, and applies recording ink containing a reactive dye to the fabric before or after applying the treatment liquid. Furthermore, the inkjet printing apparatus of this embodiment includes a first application section for applying the recording ink to the fabric and a second application section for applying the treatment liquid to the fabric. Moreover, 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 this embodiment described above.

[0170] [Example]

[0171] The present invention will be specifically described below with reference to examples, but the present invention is not limited thereto. In addition, unless otherwise specified, the operation in the following examples is carried out at room temperature (25°C).

[0172] 1. Preparation of the treatment solution

[0173] The treatment solutions were prepared according to the following steps. The components shown in Tables I to III below were added sequentially to the preparation container and mixed thoroughly. The resulting solutions were filtered through a 1 μm (pore size) filter to obtain the treatment solutions (Examples 1 to 11, Comparative Examples 1 to 4).

[0174] The following shows the details of each component.

[0175] (solvent)

[0176] glycerin

[0177] Ethylene glycol

[0178] (Low viscosity water-soluble polymer)

[0179] PEG2000: Polyethylene glycol (molecular weight 2000), PEG#2000 (trade name), manufactured by Nippon Oil Company.

[0180] PEG6000: Polyethylene glycol (molecular weight 6000), PEG#6000 (trade name), manufactured by Nippon Oil Company.

[0181] PEG11000: Polyethylene glycol (molecular weight 11000), PEG#11000 (trade name), manufactured by Nippon Oil Company.

[0182] (Alkali)

[0183] Potassium bicarbonate: Potassium bicarbonate (trade name), manufactured by Takasugi Pharmaceutical Co., Ltd.

[0184] Potassium carbonate: Potassium carbonate (trade name), manufactured by Takasugi Pharmaceutical Co., Ltd.

[0185] (Moisturizer)

[0186] Urea: Urea (trade name), manufactured by Takasugi Pharmaceutical Co., Ltd.

[0187] Ethylene urea: Ethylene urea (trade name), manufactured by Kanto Chemical Co., Ltd.

[0188] (Paste)

[0189] Carboxymethyl cellulose: CMC DAICEL 1130, manufactured by DAICEL MIRAIZU.

[0190] Sodium alginate: manufactured by Algitex LL, KIMICA

[0191] (surfactant)

[0192] OLFINE (registered trademark) E1010: A acetylenic diol surfactant, manufactured by Nissin Chemical Industry Co., Ltd.

[0193] (preservative)

[0194] Proxel (registered trademark) GXL: 20% dipropylene glycol aqueous solution of 1,2-benzisothiazolin-3-one, manufactured by Lonza Japan Co., Ltd.

[0195] Viscosity was measured using an E-type viscometer "TV-25" (manufactured by Toki Kogyo Co., Ltd.) at a temperature of 25°C.

[0196] Tables I through III show the composition of each treatment solution, the type of fabric, the basis weight of the fabric, the diameter of the water droplets, and the viscosity. The values ​​for each component in each treatment solution are expressed in "mass %".

[0197] [Table 1]

[0198] Table I

[0199]

[0200] [Table 2]

[0201] Table II

[0202]

[0203] [Table 3]

[0204] Table III

[0205]

[0206] 2. Preparation of recording ink (black ink)

[0207] The following components, as shown in Table IV, were added sequentially to a preparation container. Ion-exchanged water was then added to bring the total to 100% by mass, and the mixture was stirred thoroughly. The resulting solution was filtered through a 1 μm (pore size) filter to obtain black ink. In Table IV, the values ​​for each component are in "mass%".

[0208] [Table 4]

[0209] Table IV

[0210]

[0211]

[0212] Table V shows whether the water absorption, paste dosage, basis weight, low-viscosity polymer, and viscosity of each obtained treatment solution meet the necessary or preferred conditions of the present invention. The low-viscosity polymer is a low-viscosity water-soluble polymer. For water absorption, a case where the diameter of a 0.03g water droplet after 5 seconds (average of 10 drops) is less than 15mm is evaluated as A, and a case where it is greater than 15mm is evaluated as B. For paste dosage, a case where the paste content in the treatment solution is less than 1% by mass is evaluated as A, and a case where it is greater than 1% by mass is evaluated as B. For basis weight, a case where the basis weight of the fabric is 250g or more is evaluated as A, and a case where it is less than 250g is evaluated as B. For low-viscosity polymer, a case where the treatment solution contains a low-viscosity water-soluble polymer is evaluated as A, and a case where the treatment solution does not contain a low-viscosity water-soluble polymer is evaluated as B. For viscosity, a case where the viscosity of the treatment solution is 3.5mPa·s or more is evaluated as A, and a case where it is less than 3.5mPa·s is evaluated as B.

[0213] [Table 5]

[0214] Table V

[0215]

[0216] 3. Inkjet printing

[0217] use Figure 2 The inkjet printing apparatus shown is used to print inkjet print on fabrics that serve as the recording medium to produce samples (Examples 1-11, Comparative Examples 1-4).

[0218] Figure 2In the inkjet printing apparatus shown, a first carriage 22a is provided on the upstream side and a second carriage 22b is provided on the downstream side. Two piezoelectric inkjet heads "KM1024iSAE" (manufactured by Konica Minolta Co., Ltd.) (the second one is not shown) are mounted on the first carriage 22a. Each of the above-obtained treatment liquids is filled in the inkjet heads. Two piezoelectric inkjet heads "KM1024iSAE" (manufactured by Konica Minolta Co., Ltd.) (the second one is not shown) are mounted on the second carriage 22b. Black ink obtained above is filled in the inkjet heads.

[0219] The fabric is conveyed in the conveying direction [x] shown by using conveying rollers 11 and 12. Figure 2 The fabric is conveyed in the conveying direction [x] shown.

[0220] For the conveyed fabric, first, a total of 15 mL / m of the treatment liquid is uniformly applied to the entire surface of the fabric from the two inkjet heads of the first carriage 22a. 2 Next, black ink is applied to the fabric from the two inkjet heads of the second carriage 22b to form a solid image.

[0221] The fabric is subjected to steam treatment at 103 °C for 12 minutes to cause color development, and then washed with water. Then, the fabric is washed and rinsed at 90 °C and dried to obtain a sample.

[0222] (Example 12)

[0223] A treatment liquid was prepared in the same manner as in Comparative Example 1. Then, the fabric was a cotton broadcloth similar to that in Comparative Example 2, and the inkjet printing was carried out in the same manner as in Comparative Example 1 except for this. In the inkjet printing method of Example 12, the content rate of the paste in the treatment liquid was 1.2% by mass, and the diameter of the water droplets on the fabric was 16 mm. In addition, in the inkjet printing method of Example 12, after the inkjet printing in Example 1 was completed, the treatment liquid filled in the two inkjet heads on the first carriage 22a was replaced with the treatment liquid of Comparative Example 1 above, and the fabric was switched to cotton broadcloth, and the treatment liquid was applied to the fabric. The bleeding, cross-coloring, and water absorption of the sample obtained by the inkjet printing method of Example 12 were evaluated as follows, and the results were practically acceptable.

[0224] 4. Evaluation

[0225] (1) Judgment of water absorption of the gray fabric (unprinted fabric)

[0226] Judgment was made by the wetting diffusion when 1 drop of water was dropped from a dropper onto the white background gray fabric. A is qualified, and C is unqualified.

[0227] A: The diameter of the water droplet is less than 15 mm

[0228] C: The diameter of the water droplet is 15 mm or more

[0229] (2) Infiltration

[0230] The border between the printed area and the white background of the obtained samples was observed using a portable image quality analyzer, PiasII (manufactured by QEA), and the width of the ink bleeding was measured. A and B are considered acceptable, while C is considered unacceptable. A is the best evaluation result.

[0231] A: The width of the staining is less than 1mm.

[0232] B: The width of the staining is more than 1mm and less than 2mm.

[0233] C: The width of the staining area is 2mm or more.

[0234] (3) Color bleeding

[0235] The obtained samples were evaluated for contamination (color bleeding) on ​​the white background according to the test method of ISO 105C06. A is acceptable, and C is unacceptable.

[0236] A: Level 3 or above

[0237] C: Less than level 3

[0238] (4) Water absorption

[0239] The absorbency of the obtained samples (dyed fabric) was evaluated using the sedimentation method according to JIS L1907. A and B are acceptable, and C is unacceptable. A is the best evaluation result.

[0240] A: Until the settlement is less than 1 second

[0241] B: Until the settling time is more than 1 second but less than 10 seconds

[0242] C: Until the settling time is more than 10 seconds

[0243] The evaluation results are shown in Table VI.

[0244] [Table 6]

[0245] Table VI

[0246]

[0247] According to the embodiments and comparative examples, in the inkjet printing and dyeing treatment method of the present invention, if the diameter of the water droplets when dripping water onto the fabric is less than 15 mm, the fabric after inkjet printing and dyeing can suppress the generation of ink bleeding and has good water absorption.

[0248] Furthermore, according to Comparative Example 1, if the content of paste in the treatment solution is greater than 1% by mass, color bleeding occurs and the absorbency of the fabric decreases.

Claims

1. A treatment method for inkjet printing, wherein, In printing of a recording ink containing a reactive dye to a cloth, a treatment liquid is given to the cloth, a diameter of the cloth 5 seconds after dropping 0.3 g of water is less than 15 mm, the treatment liquid contains urea or ethylene urea, a paste contained in the treatment liquid is contained at a rate of 1 mass% or less.

2. The treatment method for inkjet printing according to claim 1, wherein The cloth has a basis weight of 250 g / m 2 The above.

3. The treatment method for inkjet printing according to claim 1, wherein, the treatment liquid contains the paste, the paste is at least one selected from the group consisting of sodium alginate, carboxymethyl cellulose, and starch.

4. The treatment method for inkjet printing according to claim 1, characterized by, the treatment liquid contains a low-viscosity water-soluble polymer.

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

6. The treatment method for inkjet printing according to claim 1, characterized by, the treatment liquid contains an alkali agent.

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

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

9. The treatment method for inkjet printing according to claim 1, wherein, a viscosity of the treatment liquid is 3.5 mPa・s or more.

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

11. The treatment method for inkjet printing according to claim 1, characterized by, the treatment liquid is given to the cloth using an inkjet head.

12. An inkjet printing method, characterized by, In printing of a recording ink containing a reactive dye to a cloth, a treatment liquid is given to the cloth, the treatment liquid and the recording ink are given to the cloth using an inkjet head.

13. The inkjet printing method according to claim 12, characterized in that, the treatment liquid is not given to the cloth before and after the treatment liquid and the recording ink are given to the cloth.

14. The inkjet printing method according to claim 12, characterized in that, The treatment liquid and the recording ink are ejected in any order, the ejection amount of the treatment liquid being 30 g / m 2 The following.

15. A treatment method for inkjet printing, wherein, a diameter of the cloth 5 seconds after dropping 0.3 g of water is 7 mm or less, a first treatment liquid is used as the treatment liquid, and a diameter of the cloth 5 seconds after dropping 0.3 g of water is 15 mm or more, a second treatment liquid containing a paste at a rate greater than the first treatment liquid is used as the treatment liquid.

16. The treatment method for inkjet printing according to claim 15, wherein a rate of the paste of the first treatment liquid is 1 mass% or less, a rate of the paste of the second treatment liquid is greater than 1 mass%. contains urea or ethylene urea, 17. A treating liquid for a cloth and fabric having a diameter of 7 mm or less, which is dropped for 5 seconds at 0.3 g of water in dyeing and printing, characterized by comprising: a rate of the contained paste is 1 mass% or less. the inkjet printing apparatus is for inkjet printing in which a treatment liquid is given to a cloth using the treatment method for inkjet printing according to claim 1, and a recording ink containing a reactive dye is given to the cloth before and after the treatment liquid is given to the cloth, 18. An inkjet printing apparatus, characterized by comprising: the inkjet printing apparatus has a first application unit that applies the recording ink to the cloth, and a second application unit that applies the treatment liquid to the cloth. ​

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