Inkjet printing apparatus, inkjet printing method, and recording medium

Abstract

The invention relates to an inkjet printing apparatus, an inkjet printing method, and a recording medium. An inkjet textile printing device P is provided with a plurality of heads for discharging a soak solution and a color ink to a fabric 3, and a control unit 6 that functions as a control unit for controlling the discharge of the soak solution by the heads, the control unit 6 controlling the discharge of the soak solution by the heads when the amount of adhesion of the color ink is A [g / m2] and the amount of adhesion of the soak solution is B [g / m2], and the discharge of the soak solution by the heads is A [g / m2] and B [g / m2]. When A1 > A2, the amount of the color ink adhered to the first color ink discharge region and the amount of the permeation liquid adhered to the second color ink discharge region are A1 and B1, respectively, and A2 and B2, respectively, the following formula (1) is satisfied: B1 < B2... (1).

Description

Technical Field

[0001] This invention relates to inkjet printing and dyeing apparatus, inkjet printing and dyeing method, and recording medium. Background Technology

[0002] As a method of printing images such as text, pictures, and patterns onto fabrics such as woven and non-woven fabrics, inkjet printing, which ejects ink from an inkjet head and causes it to bounce onto the fabric, has become widely popular in recent years.

[0003] In printing and dyeing, it is required that the surface of the fabric to which the ink is applied and the opposite back of the fabric exhibit the same color tone; that is, the ink should penetrate to the back. If the ink penetrates to the back, it further enhances the aesthetic appeal of the printed fabric.

[0004] Therefore, for example, Patent Documents 1 and 2 describe a method in which the printed ink is permeated to the back side by applying an impregnation liquid to the fabric.

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent Document 1: Japanese Patent Application Publication No. 2022-014927

[0008] Patent Document 2: Japanese Patent No. 7206699 Summary of the Invention

[0009] The problem that the invention aims to solve

[0010] However, if a penetrating solution is used, the ink penetrates to the back side, and the surface concentration tends to decrease accordingly. Although this problem can be addressed by increasing the amount of ink applied, ink bleeding occurs in this case. In addition, ink consumption increases, thus raising printing costs.

[0011] The present invention was made in view of this actual situation. Its object is to provide an inkjet printing apparatus, inkjet printing method and recording medium that can suppress ink bleeding and reduction of surface concentration even when using an impregnation solution.

[0012] Methods for solving problems

[0013] To address the above-mentioned issues, the invention described in claim 1 is an inkjet printing apparatus, comprising:

[0014] Multiple nozzles that discharge impregnating liquid and colored ink into the fabric, and

[0015] A discharge control unit that controls the discharge of the impregnating liquid using the aforementioned head.

[0016] The amount of the above-mentioned colored ink is set as A [g / m]. 2Let the adhesion amount of the above impregnation liquid be B [g / m]. 2 When the above-mentioned discharge control unit controls the discharge of the above-mentioned impregnating liquid using the above-mentioned head, such that the amount of the above-mentioned colored ink and the amount of the above-mentioned impregnating liquid adhering in the first colored ink discharge area are A1 and B1 respectively, and the amount of the above-mentioned colored ink and the amount of the above-mentioned impregnating liquid adhering in the second colored ink discharge area are A2 and B2 respectively, and when A1 > A2, the following formula (1) is satisfied:

[0017] B1 < B2…(1).

[0018] The invention described in claim 2 is the inkjet printing apparatus described in claim 1, wherein the discharge control unit controls the discharge of the impregnation liquid using the head, such that when the surface concentration of the colored ink discharge area and the color difference of the fabric are set as α, and the back concentration of the colored ink discharge area and the color difference of the fabric are set as β, 0.6≤β / α≤1.0 is satisfied.

[0019] The invention described in claim 3 is the inkjet printing apparatus described in claim 2, wherein the discharge control unit sets the set value to C[g / m 2 The maximum adhesion amount of the above-mentioned impregnation liquid is set to D [g / m]. 2 When any positive integer is set as γ, the amount of the impregnating liquid B is set based on the following formula (2).

[0020] B=min(D, max(C-γA, 0))...(2).

[0021] The invention described in claim 4 is the inkjet printing apparatus described in claim 2, wherein the discharge control unit sets the set value to C[g / m 2 The maximum adhesion amount of the above-mentioned impregnation liquid is set to D [g / m]. 2 ] , set any positive integer as γ, set as the minimum adhesion amount E [g / m] of the above impregnation liquid. 2 When the amount of the impregnating liquid adhering to the above liquid is set based on the following formula (3),

[0022] B=min(D, max(C-γA, E))...(3).

[0023] The invention described in claim 5 is the inkjet printing apparatus described in claim 3 or 4, wherein the discharge control unit controls the head so that the impregnation liquid is not discharged in the non-discharge area of ​​the colored ink.

[0024] The invention described in claim 6 is the inkjet printing apparatus described in any one of claims 2 to 4, wherein the plurality of heads discharge the colored inks of a plurality of colors.

[0025] The invention described in claim 7 is the inkjet printing apparatus described in claim 3 or 4, wherein the discharge control unit sets the maximum amount of the impregnating liquid adhering according to the printing resolution.

[0026] The invention described in claim 8 is the inkjet printing apparatus described in claim 7, which comprises:

[0027] An image forming control unit forms a predetermined test image on the fabric by controlling the discharge of the aforementioned colored ink using the aforementioned head;

[0028] The reading unit reads the test image formed on the aforementioned fabric; and

[0029] The setting unit sets the print resolution and the setting value based on the reading results of the test image obtained by the reading unit.

[0030] The invention described in claim 9 is the inkjet printing and dyeing apparatus described in claim 1, wherein the impregnation liquid contains a surfactant, and the total content of the surfactant in the impregnation liquid is 2.0% or more.

[0031] The invention described in claim 10 is the inkjet printing and dyeing apparatus described in claim 9, wherein the total content of the surfactant in the impregnation liquid is less than 5.0%.

[0032] The invention described in claim 11 is the inkjet printing and dyeing apparatus described in claim 10, wherein the surfactant is an alkynyl diol surfactant.

[0033] The invention described in claim 12 is the inkjet printing apparatus described in claim 1, wherein the colored ink contains dye.

[0034] The invention described in claim 13 is an inkjet printing method using an inkjet printing apparatus equipped with multiple heads for discharging impregnation liquid and colored ink onto fabric, comprising the following control step: setting the amount of colored ink applied as A [g / m 2 Let the adhesion amount of the above impregnation liquid be B [g / m]. 2 When the head discharging the impregnating liquid is controlled, the amount of colored ink and the amount of impregnating liquid adhering in the first colored ink discharge area are A1 and B1 respectively, and the amount of colored ink and the amount of impregnating liquid adhering in the second colored ink discharge area are A2 and B2 respectively. When A1 > A2, the following formula (1) is satisfied:

[0035] B1 < B2…(1).

[0036] The invention described in claim 14 is the inkjet printing method described in claim 13, wherein the control step controls the discharge of the impregnation liquid using the head, such that when the color difference between the surface concentration of the colored ink discharge area and the fabric is set as α, and the color difference between the back concentration of the colored ink discharge area and the fabric is set as β, 0.6≤β / α≤1.0 is satisfied.

[0037] The invention described in claim 15 is the inkjet printing method described in claim 14, wherein the above-mentioned control step involves setting the set value to C[g / m 2 The maximum adhesion amount of the above-mentioned impregnation liquid is set to D [g / m]. 2 When any positive integer is set as γ, the amount of the impregnating liquid B is set based on the following formula (2).

[0038] B=min(D, max(C-γA, 0))...(2).

[0039] The invention described in claim 16 is the inkjet printing method described in claim 14, wherein the above-mentioned control step involves setting the set value to C[g / m 2 The maximum adhesion amount of the above-mentioned impregnation liquid is set to D [g / m]. 2 ] , set any positive integer as γ, set as the minimum adhesion amount E [g / m] of the above impregnation liquid. 2 When the amount of the impregnating liquid adhering to the above liquid is set based on the following formula (3),

[0040] B=min(D, max(C-γA, E))...(3).

[0041] The invention described in claim 17 is the inkjet printing method described in claim 15 or 16, wherein the control step controls the head so that the impregnation liquid is not discharged in the non-discharge area of ​​the colored ink.

[0042] The invention described in claim 18 is the inkjet printing method described in claim 15 or 16, wherein the above-mentioned control step sets the maximum amount of the impregnating liquid to be applied according to the printing resolution.

[0043] The invention described in claim 19 is the inkjet printing method described in claim 18, which comprises:

[0044] An image forming control step is performed by controlling the discharge of the colored ink using the aforementioned head to form a predetermined test image on the aforementioned fabric.

[0045] The steps for reading the test image formed on the aforementioned fabric; and

[0046] The setting steps are based on the reading results of the test image generated by the above reading steps to set the above printing resolution and the above setting values.

[0047] The invention described in claim 20 is a computer-readable recording medium storing a program, wherein a computer of an inkjet printing apparatus having multiple heads dispensing impregnation liquid and colored ink onto fabric functions as an ejection control unit, which controls the heads dispensing the impregnation liquid such that the amount of colored ink adhering is set to A [g / m]. 2 Let the adhesion amount of the above impregnation liquid be B [g / m]. 2 When the amount of the colored ink and the amount of the impregnating liquid adhering in the first colored ink discharge area are A1 and B1 respectively, and the amount of the colored ink and the amount of the impregnating liquid adhering in the second colored ink discharge area are A2 and B2 respectively, and A1 > A2, the following equation (1) is satisfied:

[0048] B1 < B2…(1).

[0049] The invention described in claim 21 is the recording medium described in claim 20, wherein the discharge control unit controls the discharge of the impregnating liquid using the head such that when the surface concentration of the colored ink discharge area and the color difference of the fabric are set as α, and the back concentration of the colored ink discharge area and the color difference of the fabric are set as β, 0.6≤β / α≤1.0 is satisfied.

[0050] The invention described in claim 22 is the recording medium described in claim 21, wherein the discharge control unit sets the set value to C[g / m 2 The maximum adhesion amount of the above-mentioned impregnation liquid is set to D [g / m]. 2 When any positive integer is set as γ, the amount of the impregnating liquid B is set based on the following formula (2).

[0051] B=min(D, max(C-γA, 0))...(2).

[0052] The invention described in claim 23 is the recording medium described in claim 21, wherein the discharge control unit sets the set value to C[g / m 2 The maximum adhesion amount of the above-mentioned impregnation liquid is set to D [g / m]. 2 ] , set any positive integer as γ, set as the minimum adhesion amount E [g / m] of the above impregnation liquid. 2 When the amount of the impregnating liquid adhering to the above liquid is set based on the following formula (3),

[0053] B=min(D, max(C-γA, E))...(3).

[0054] The invention described in claim 24 is the recording medium described in claim 22 or 23, wherein the discharge control unit controls the head so that the impregnating liquid is not discharged in the non-discharge area of ​​the color ink.

[0055] The invention described in claim 25 is the recording medium described in claim 22 or 23, wherein the discharge control unit sets the maximum amount of the impregnating liquid adhering according to the printing resolution.

[0056] The invention described in claim 26 is the recording medium described in claim 25, wherein the computer that enables the inkjet printing apparatus described above functions as follows:

[0057] An image forming control unit forms a predetermined test image on the fabric by controlling the discharge of the aforementioned colored ink using the aforementioned head;

[0058] The reading unit reads the test image formed on the aforementioned fabric;

[0059] The setting unit sets the print resolution and the setting value based on the reading results of the test image obtained by the reading unit.

[0060] The effects of the invention

[0061] According to the present invention, even when using an impregnation solution, ink bleeding and reduction of surface concentration can be suppressed. Attached Figure Description

[0062] Figure 1 This is a schematic diagram illustrating an example of the configuration of an inkjet recording device applicable to inkjet printing methods.

[0063] Figure 2 This is a process flow diagram illustrating an example of the printing and dyeing process in an inkjet printing method.

[0064] Figure 3 A coordinate graph illustrating an example of the relationship between the amount of colored ink adhered and the amount of penetrating liquid adhered.

[0065] Figure 4 A coordinate graph illustrating an example of the relationship between the amount of colored ink adhered and the amount of penetrating liquid adhered.

[0066] Figure 5 A coordinate graph illustrating an example of the relationship between the amount of colored ink adhered and the amount of penetrating liquid adhered.

[0067] Figure 6 A coordinate graph illustrating an example of the relationship between the amount of colored ink adhered and the amount of penetrating liquid adhered.

[0068] Figure 7A coordinate graph illustrating an example of the relationship between the amount of colored ink adhered and the amount of penetrating liquid adhered.

[0069] Figure 8 A coordinate graph illustrating an example of the relationship between the amount of colored ink adhered and the amount of penetrating liquid adhered.

[0070] Figure 9 A coordinate graph illustrating an example of the relationship between the amount of colored ink adhered and the amount of penetrating liquid adhered.

[0071] Figure 10 A coordinate graph illustrating an example of the relationship between the amount of colored ink adhered and the amount of penetrating liquid adhered.

[0072] Explanation of reference numerals in the attached figures

[0073] 3. Cloth

[0074] 6. Control Unit (Discharge Control Unit, Acquisition Unit, Image Forming Control Unit)

[0075] P inkjet recording device Detailed Implementation

[0076] Hereinafter, the inkjet printing apparatus according to embodiments of the present invention will be described in detail using the accompanying drawings. However, the scope of the invention is not limited to the examples shown in the drawings. It will be noted that in the following description, elements having the same function and structure are labeled with the same reference numerals, and their descriptions are omitted.

[0077] In addition, in this application, “~” is used to mean the lower limit and upper limit values ​​contained in the numerical values ​​recorded before and after it.

[0078] [Inkjet Printing Ink Set]

[0079] First, the ink assembly (hereinafter also referred to as "ink assembly") discharged from the inkjet printing apparatus of the present invention will be described. The ink assembly consists of an inkjet printing impregnation liquid (hereinafter also referred to as "impregnation liquid") and inkjet printing colored ink (hereinafter also referred to as "colored ink"). Furthermore, the impregnation liquid contains at least surfactant A, an organic solvent, and water, and the total content of surfactant A is 2.0% by mass or more. In addition, the colored ink contains at least dye. Moreover, the total content of surfactant A contained in the impregnation liquid is 30 times or more but less than 80 times the total content of surfactant B contained in the colored ink.

[0080] (Immersion liquid)

[0081] The impregnation liquid of the present invention contains surfactant A, an organic solvent, and water. The surfactant A, the organic solvent, and other constituent materials of the impregnation liquid will be described in detail below.

[0082] [Surfactant A]

[0083] In this invention, the total content of surfactant A in the impregnation liquid is 2% by mass or more. It should be noted that the term "total content of surfactant A" refers to the value expressed as a percentage of mass of the total mass of surfactant A when the total mass of the impregnation liquid is set to 100% by mass.

[0084] The total content of surfactant A is preferably in the range of 2% by mass or more and less than 10% by mass. More preferably, the total content of surfactant A is in the range of 2% by mass or more and less than 5% by mass.

[0085] The surfactant A involved in this invention can be one type or composed of two or more surfactants. When surfactant A is composed of two or more types, the total mass of the two or more surfactants is defined as the total content of surfactant A contained in the impregnation liquid.

[0086] The surfactant A contained in the impregnation liquid is not particularly limited, and for example, alkynyl glycol surfactants, fluorinated surfactants, and organosilicon surfactants can be used. However, from the viewpoint of impregnation into the fabric, alkynyl glycol surfactants are preferred.

[0087] {Alkyne diol surfactants}

[0088] As an alkynyl diol surfactant, there are no particular limitations, but for example, it is preferably selected from one or more of the olefin oxide adducts of 2,4,7,9-tetramethyl-5-decyn-4,7-diol, 2,4,7,9-tetramethyl-5-decyn-4,7-diol, 2,4-dimethyl-5-decyn-4-ol, and 2,4-dimethyl-5-decyn-4-ol.

[0089] Alkyne diol surfactants are also available commercially. Examples include the Orfin 104 series, Orfin E1004, E1006, E1010, E1020, E1030, and other E-series surfactants, Orfin PD-002W, Serifol 465, Serifol 61, etc. (all manufactured by Nissin Chemical Industries, Ltd.). Alkyne diol surfactants can be used alone or in combination with two or more surfactants.

[0090] {Fluorosurfactants}

[0091] In addition, fluorinated surfactants include, for example, perfluoroalkyl sulfonates, perfluoroalkyl carboxylates, perfluoroalkyl phosphates, perfluoroalkyl ethylene oxide adducts, perfluoroalkyl betaines, and perfluoroalkyl amine oxide compounds. In addition, silicone surfactants include polysiloxane compounds and polyether-modified silicones.

[0092] Regarding the ink assembly of the present invention, the total content of surfactant A contained in the inkjet printing penetrant is preferably 30 times or more but less than 80 times the total content of surfactant B (described later) contained in the inkjet printing colored ink, and particularly preferably 40 times or more but less than 60 times.

[0093] Regarding the ratio of the total content of each surfactant mentioned in this invention, when the total mass of the penetrant or colored ink is set to 100% by mass, it is expressed as the ratio (concentration of surfactant A (mass%) / concentration of surfactant B (mass%)) when the content concentration (mass%) of each surfactant A and surfactant B is expressed.

[0094] In this invention, by maintaining the ratio of surfactant A concentration (mass%) to surfactant B concentration (mass%) within the range specified above, the penetration of colored ink into the fabric is improved. As a result, printed and dyed products with excellent color development stability, such as resistance to color development inhibition and resistance to color development unevenness, are obtained.

[0095] [Organic solvents]

[0096] The impregnation solution of the present invention contains an organic solvent in addition to surfactant A. Regarding the total content of organic solvent in the impregnation solution of the present invention, when the total mass of the impregnation solution is set to 100% by mass, it is preferably 40% by mass or more.

[0097] There are no particular limitations on the organic solvents that can be used in this invention. For example, glycol ether solvents, nitrogen-containing solvents, aprotic polar solvents, alkyl polyol solvents, monohydric alcohol solvents, etc., can be used as organic solvents. One organic solvent can be used alone, or two or more can be used in combination.

[0098] {alkyl polyols}

[0099] In this invention, at least one organic solvent is preferably an alkyl polyol. There are no particular limitations on the alkyl polyols that can be used in this invention; examples include 1,2-pentanediol (104°C), propylene glycol (188°C), 1,2-butanediol (193°C), ethylene glycol (197°C), 1,3-butanediol (207°C), 1,3-propanediol (214°C), 1,2-hexanediol (223°C), 1,4-butanediol (230°C), 2-methyl-2-propyl-1,3-propanediol (230°C), 1,5-pentanediol (242°C), 2-ethyl-1,3-hexanediol (244°C), 3-methyl-1,5-pentanediol (249°C), and 1,6-hexanediol (250°C), etc. (the values ​​in parentheses indicate standard boiling points). Preferably, alkyl polyols with a boiling point below 200°C are used. For example, propylene glycol (188°C), 1,2-butanediol (193°C), ethylene glycol (197°C), etc. can be used.

[0100] Using such alkyl polyols tends to further improve clogging reliability when applying the impregnation liquid via inkjet printing. These alkyl polyols can be used alone or in combination of two or more. Regarding the content of the alkyl polyol, it is preferably 10-70% by mass, more preferably 20-60% by mass, relative to 100% by mass of the inkjet printing impregnation liquid.

[0101] {Diol Ethers}

[0102] In this invention, in addition to the aforementioned alkyl polyols, glycol ethers can be used as organic solvents. There are no particular limitations on the glycol ether used; examples include dipropylene glycol dimethyl ether (171°C), diethylene glycol ethyl methyl ether (176°C), diethylene glycol isopropyl methyl ether (179°C), dipropylene glycol monomethyl ether (188°C), diethylene glycol diethyl ether (189°C), diethylene glycol monomethyl ether (194°C), diethylene glycol butyl methyl ether (212°C), tripropylene glycol dimethyl ether (215°C), triethylene glycol dimethyl ether (216°C), diethylene glycol monobutyl ether (230°C), dipropylene glycol (230°C), diethylene glycol (245°C), ethylene glycol monophenyl ether (245°C), triethylene glycol monomethyl ether (249°C), and diethylene glycol dibutyl ether (256°C) (the values ​​in parentheses represent standard boiling points). Among them, diethylene glycol monobutyl ether (boiling point 230℃) and triethylene glycol monomethyl ether (boiling point 230℃) are preferred.

[0103] [water]

[0104] There are no particular restrictions on the type of water used; pure water such as ion-exchanged water, ultrafiltered water, reverse osmosis water, and distilled water, or ultrapure water, can be used. The water content is also not particularly limited and can be appropriately determined as needed; water can be included as a surplus of other components in the penetrant. For example, regarding the water content, it can be in the range of 30% to 80% by mass relative to the total amount (100% by mass) of the penetrant for inkjet printing.

[0105] [Other Additives]

[0106] In addition to the additives mentioned above, pH adjusters, chelating agents, humectants, anti-reduction agents, preservatives, and antifungal agents can also be added to the impregnation solution involved in this invention.

[0107] As preservatives and fungicides, for example, aromatic halogen compounds (such as Preventol CMK, manufactured by Bayer), dithiocyanomethane, halogenated nitrogen and sulfur compounds, 1,2-benzisothiazolin-3-one (such as PROXEL GXL, manufactured by Lonza Nippon Co., Ltd.) can be added.

[0108] As a pH adjuster, urea, sodium hydroxide, etc. can be added, for example.

[0109] [Liquid properties of the impregnation solution]

[0110] The impregnation liquid preferably has a viscosity of 2–10 mPa·s at 25°C. More preferably, the viscosity at 25°C is 4–8 mPa·s. Even more preferably, the viscosity at 25°C is approximately 7 mPa·s. The viscosity of the ink composition can be determined using a vibratory viscometer according to JIS Z8809. Furthermore, the surface tension of the impregnation liquid is preferably in the range of 20–40 mN / m.

[0111] [Preparation method of impregnation solution]

[0112] Regarding the impregnation liquid of the present invention, it can be prepared by mixing the above-mentioned components in any order and removing impurities by filtration or other methods as needed. As a method for mixing the constituent materials, it is preferable to use a method in which the materials are added sequentially and stirred in a container equipped with a stirring device such as a mechanical stirrer or a magnetic stirrer. As a filtration method, for example, centrifugal filtration or filter filtration can be performed as needed.

[0113] Furthermore, it is also preferable to perform degassing treatment on the impregnation liquid involved in this invention. When the impregnation liquid is applied to the fabric by inkjet printing, if the impregnation liquid contains dissolved gases, fine bubbles are generated in the impregnation liquid when it is discharged from the inkjet head, becoming a major cause of poor discharge. Therefore, it is preferable to remove the dissolved gases from the impregnation liquid. As degassing methods, they can be broadly categorized into physical methods such as boiling and depressurization, and chemical methods such as adding an absorbent to the pretreatment ink, which can be appropriately selected and applied.

[0114] (color ink)

[0115] The colored ink of the present invention contains dye as a pigment. Furthermore, the colored ink more preferably contains surfactant B. In addition to this, the colored ink may also contain organic solvents, ureas, sugars, pH adjusters, chelating agents, preservatives, rust inhibitors, and other components.

[0116] [Colorant]

[0117] In this invention, the content of colorant in the colored ink is preferably 1 to 25% by mass of the total mass of the colored ink, more preferably 2 to 20% by mass. There are no particular limitations on the dyes that can be used in the colored inks of this invention, and disperse dyes, reactive dyes, acid dyes, and direct dyes are all acceptable. As for the hues of the various colors constituting the colored ink, yellow, magenta, cyan, black, blue, green, and red are preferred. Yellow, magenta, cyan, and black dyes are particularly preferred for the colored inks.

[0118] The following shows specific compounds of dyes preferred for use as colorants in this invention, but the invention is not limited to these illustrated compounds.

[0119] {Disperse dyes}

[0120] The preferred disperse dyes used in the colored inks of this invention include:

[0121] CI Dispersible Yellow: 3, 4, 5, 7, 9, 13, 23, 24, 30, 33, 34, 42, 44, 49, 50, 51, 54, 56, 58, 60, 63, 64, 66, 68, 71, 74, 76, 79, 82, 83, 85, 86, 88, 90, 91, 93, 98, 99, 100, 104, 108, 114, 116 118, 119, 122, 124, 126, 135, 140, 141, 149, 160, 162, 163, 164, 165, 179, 180, 182, 183, 184, 186, 192, 198, 199, 202, 204, 210, 211, 215, 216, 218, 224, 227, 231, 232

[0122] CI Disperse Orange: 1, 3, 5, 7, 11, 13, 17, 20, 21, 25, 29, 30, 31, 32, 33, 37, 38, 42, 43, 44, 45, 46, 47, 48, 49, 50, 53, 54, 55, 56, 57, 58, 59, 61, 66, 71, 73, 76, 78, 80, 89, 90, 91, 93, 96, 97, 119, 127, 130, 139, 142

[0123] CI Disperse Red: 1, 4, 5, 7, 11, 12, 13, 15, 17, 27, 43, 44, 50, 52, 53, 54, 55, 56, 58, 59, 60, 65, 72, 73, 74, 75, 76, 78, 81, 82, 86, 88, 90, 91, 92, 93, 96, 103, 105, 106, 107, 108, 110, 111, 113, 117, 118, 121, 122, 126, 127, 128, 131, 132, 134, 135, 137, 143, 145, 146 151, 152, 153, 154, 157, 159, 164, 167, 169, 177, 179, 181, 183, 184, 185, 188, 189, 190, 191, 192, 200, 201, 202, 203, 205, 206, 207, 210, 221, 224, 225, 227, 229, 239, 240, 257, 258, 277, 278, 279, 281, 288, 298, 302, 303, 310, 311, 312, 320, 324, 328

[0124] CI Disperse Violet: 1, 4, 8, 23, 26, 27, 28, 31, 33, 35, 36, 38, 40, 43, 46, 48, 50, 51, 52, 56, 57, 59, 61, 63, 69, 77

[0125] CI Disperse Green: 9

[0126] CI Dispersible Brown: 1, 2, 4, 9, 13, 19

[0127] CI Disperse Blue: 3, 7, 9, 14, 16, 19, 20, 26, 27, 35, 43, 44, 54, 55, 56, 58, 60, 62, 64, 71, 72, 73, 75, 79, 81, 82, 83, 87, 91, 93, 94, 95, 96, 102, 106, 108, 112, 113, 115, 118, 120, 122, 125, 128, 130, 139, 141, 142, 143, 146, 148, 14 9, 153, 154, 158, 165, 167, 167: 1, 171, 173, 174, 176, 181, 183, 185, 186, 187, 189, 197, 198, 200, 201, 205, 207, 211, 214, 224, 225, 257, 259, 267, 268, 270, 284, 285, 287, 288, 291, 293, 295, 297, 301, 315, 330, 333

[0128] CI Dispersion Black: 1, 3, 10, 24

[0129] wait.

[0130] In inkjet printing and dyeing methods using disperse dyes, disperse dyes with good sublimation fastness are preferred when high-temperature treatment is used to develop the color. This is because when the dye sublimates onto the white parts of the machinery or fabric, it can cause contamination.

[0131] {Reactive dyes}

[0132] Reactive dyes preferred for use in the colored inks of the present invention include:

[0133] CI Active Yellow: 2, 3, 7, 15, 17, 18, 22, 23, 24, 25, 27, 37, 39, 42, 57, 69, 76, 81, 84, 85, 86, 87, 92, 95, 102, 105, 111, 125, 135, 136, 137, 142, 143, 145, 151, 160, 161, 165, 167, 168, 175, 176

[0134] 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

[0135] CI Reactive Red: 2, 3, 3: 1, 5, 8, 11, 21, 22, 23, 24, 28, 29, 31, 33, 35, 43, 45, 49, 55, 56, 58, 65, 66, 78, 83, 84, 106, 111, 112, 113, 114, 116, 120, 123, 124, 128, 130, 136, 141, 147, 158, 159, 171, 174, 180, 183, 184, 187, 190, 193, 194, 195, 198, 218, 220, 222, 223, 226, 228, 235

[0136] CI Reactive Violet: 1, 2, 4, 5, 6, 22, 23, 33, 36, 38

[0137] 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

[0138] CI Reactive Green: 8, 12, 15, 19, 21

[0139] CI Active Brown: 2, 7, 9, 10, 11, 17, 18, 19, 21, 23, 31, 37, 43, 46

[0140] CI Reactive Black: 5, 8, 13, 14, 31, 34, 39

[0141] wait.

[0142] {Acid dyes}

[0143] Acid dyes preferred for use in the colored inks of the present invention can be listed as follows:

[0144] CI Acid Yellow: 1, 3, 11, 17, 18, 19, 23, 25, 36, 38, 40, 40; 1, 42, 44, 49, 59, 59; 1, 61, 65, 67, 72, 73, 79, 99, 104, 110, 159, 169, 176, 184, 193, 200, 204, 207, 215, 219, 219; 1, 220, 230, 232, 235, 241, 242, 246.

[0145] CI Acid Orange: 3, 7, 8, 10, 19, 22, 24, 51, 51S, 56, 67, 74, 80, 86, 87, 88, 89, 94, 95, 107, 108, 116, 122, 127, 140, 142, 144, 149, 152, 156, 162, 166, 168

[0146] CI Acid Red: 1, 6, 8, 9, 13, 18, 27, 35, 37, 52, 54, 57, 73, 82, 88, 97, 97; 1, 106, 111, 114, 118, 119, 127, 131, 138, 143, 145, 151, 183, 195, 198, 211, 215, 217, 225, 226, 249, 251, 254, 256, 257, 260, 261, 265, 266, 274, 276, 277, 289, 296, 299, 315, 318, 336, 337, 357, 359, 361, 362, 364, 366, 399, 407, 415

[0147] CI Acid Violet: 17, 19, 21, 42, 43, 47, 48, 49, 54, 66, 78, 90, 97, 102, 109, 126

[0148] CI Acid Blue: 1, 7, 9, 15, 23, 25, 40, 61; 1, 62, 72, 74, 80, 83, 90, 92, 103, 104, 112, 113, 114, 120, 127, 127; 1, 128, 129, 138, 140, 142, 156, 158, 171, 182, 185, 193, 199 201, 203, 204, 205, 207, 209, 220, 221, 224, 225, 229, 230, 239, 258, 260, 264, 277, 1, 278, 279, 280, 284, 290, 296, 298, 300, 317, 324, 333, 335, 338, 342, 350

[0149] CI Acid Green: 9, 12, 16, 19, 20, 25, 27, 28, 40, 43, 56, 73, 81, 84, 104, 108, 109

[0150] CI Acid Brown: 2, 4, 13, 14, 19, 28, 44, 123, 224, 226, 227, 248, 282, 283, 289, 294, 297, 298, 301, 355, 357, 413

[0151] CI Acid Black: 1, 2, 3, 24, 24; 1, 26, 31, 50, 52, 52; 1, 58, 60, 63, 63S, 107, 109, 112, 119, 132, 140, 155, 172, 187, 188, 194, 207, 222.

[0152] wait.

[0153] {Direct dyes}

[0154] Direct dyes preferred for use in the colored inks of this invention can be listed as follows:

[0155] CI direct yellow: 8, 9, 10, 11, 12, 22, 27, 28, 39, 44, 50, 58, 86, 87, 98, 105, 106, 130, 137, 142, 147, 153,

[0156] CI direct orange: 6, 26, 27, 34, 39, 40, 46, 102, 105, 107, 118

[0157] CI direct red: 2, 4, 9, 23, 24, 31, 54, 62, 69, 79, 80, 81, 83, 84, 89, 95, 212, 224, 225, 226, 227, 239, 242, 243, 254

[0158] CI Direct Purple: 9, 35, 51, 66, 94, 95

[0159] CI Direct Blue: 1, 15, 71, 76, 77, 78, 80, 86, 87, 90, 98, 106, 108, 160, 168, 189, 192, 193, 199, 200, 201, 202, 203, 218, 225, 229, 237, 244, 248, 251, 270, 273, 274, 290, 291

[0160] CI direct green: 26, 28, 59, 80, 85

[0161] CI Direct Brown: 44, 44: 1, 106, 115, 195, 209, 210, 212: 1, 222, 223

[0162] CI direct blacklist: 17, 19, 22, 32, 51, 62, 108, 112, 113, 117, 118, 132, 146, 154, 159, 169

[0163] wait.

[0164] [Surfactant B]

[0165] There are no particular limitations on the surfactant B that can be used in the colored inks of this invention. For example, as with the surfactant A used in the aforementioned impregnation solution, alkynyl glycol surfactants, fluorinated surfactants, organosilicon surfactants, etc., can be used as surfactant B.

[0166] When surfactant B is used in colored inks, it can be used alone or in combination with two or more surfactants. Regarding surfactant B, it is preferable to add it in the range of 0.001 to 1% by mass relative to the total mass of the colored ink. If surfactant B is added within this range, the surface tension of the colored ink can be adjusted arbitrarily.

[0167] [Organic solvents]

[0168] The water-soluble organic solvent used in the color ink of the present invention can be the same organic solvent used in the impregnation solution described above. The content of the water-soluble organic solvent is preferably in the range of 10 to 60% by mass relative to the total mass of the color ink.

[0169] [Various other additives]

[0170] In the colored ink of the present invention, similar to the impregnation liquid described above, various additives can be added. For example, inorganic salts, pH adjusters, chelating agents, humectants, anti-reduction agents, preservatives, and antifungal agents can be added as additives to the colored ink. Furthermore, as needed, for example, rust inhibitors such as benzotriazole, antioxidants, ultraviolet absorbers, oxygen absorbers, and solvent aids, which are commonly used in inkjet inks, can be added to the colored ink.

[0171] {Inorganic salts}

[0172] As an inorganic salt, it is not particularly limited; for example, sodium chloride, sodium sulfate, magnesium chloride, magnesium sulfate, etc. can be added.

[0173] {Preservatives, mildew inhibitors, pH adjusters}

[0174] As preservatives and mildew inhibitors, for example, aromatic halogen compounds (such as Preventol CMK, manufactured by Bioel Co., Ltd.), dithiocyanomethane, halogen-containing nitrogen and sulfur compounds, and 1,2-benzisothiazolin-3-one (such as PROXEL GXL, manufactured by Lonzajapan Co., Ltd.) can be added to color inks. As pH adjusters, for example, urea and sodium hydroxide can be added to color inks.

[0175] [Liquid Properties of Colored Inks]

[0176] {pH}

[0177] The color ink of the present invention preferably has a pH of 7.0 or higher and 11.0 or lower. Furthermore, a pH of 7.0 or higher and 8.0 or lower is more preferred. When the pH of the color ink is within this range, the preservation stability of the dye in the ink is improved, and changes in the color development and hue of the resulting image are less likely to occur.

[0178] {Surface tension}

[0179] In this invention, regarding the colored ink for inkjet printing, from the viewpoint of balancing printing quality and reliability as an inkjet ink, a surface tension of 20–40 mN / m at 20°C is preferred. Furthermore, a surface tension of 30–36 mN / m at 20°C is more preferred. If the surface tension of the colored ink is within this range, its discharge stability in inkjet printing is excellent. Additionally, when adhering to fabric, the colored ink readily and evenly wets and spreads onto the fabric, easily penetrating it. Therefore, the colored ink becomes easier to fix onto the fabric.

[0180] To explain, in terms of surface tension measurement, for example, the static surface tension of a platinum plate wetted with ink can be determined by using an automatic surface tension meter CBVP-Z (trade name, manufactured by Kyowa Interface Science Co., Ltd.) at an environment of 20°C.

[0181] {Viscosity}

[0182] The viscosity of the colored ink at 20°C is preferably in the range of 1.5 to 10 mPa·s. More preferably, the viscosity is in the range of 2 to 8 mPa·s. Even more preferably, the viscosity is in the range of 4 to 5.5 mPa·s. When the viscosity of the ink at 20°C is within the above range, it is easier to fix the ink when it adheres to the fabric, thus improving color development.

[0183] In this invention, the viscosity of colored ink can be measured, for example, using a cone-plate viscometer. As a cone-plate viscometer, for example, the TVE-33LT viscometer manufactured by Toki Sangyo Co., Ltd. is used.

[0184] [Preparation methods for colored inks]

[0185] Regarding colored inks, they are obtained by mixing the aforementioned components in any order and removing impurities through filtration or other methods as needed. As a mixing method, it is preferable to add the components sequentially to a container equipped with a stirring device such as a mechanical stirrer or magnetic stirrer and mix them by stirring. As a filtration method, centrifugal filtration, filter filtration, etc., can be performed as needed.

[0186] Inkjet printing method

[0187] The inkjet printing method of the present invention (hereinafter also referred to as the "printing method") uses an impregnation liquid and colored ink. The impregnation liquid contains at least surfactant A, an organic solvent, and water, and the total content of surfactant A is 2.0% by mass or more. In addition, the colored ink contains at least dye. Moreover, it is characterized in that, after the impregnation liquid is applied to the fabric, the colored ink is applied to form a printed image.

[0188] The printing method of the present invention is performed by inkjet recording that ejects ink droplets using an inkjet head. The inkjet head can be an on-demand inkjet head or a continuous inkjet head. Furthermore, regarding the ejection method of the inkjet head, any ejection method is acceptable. Examples of inkjet ejection methods include electro-mechanical conversion methods (e.g., single-chamber type, dual-chamber type, supplier type, piston type, shared-mode type, shared-wall type, etc.) and electro-thermal conversion methods (e.g., thermal inkjet type, Bubble Jet (registered trademark) type, etc.).

[0189] There are no particular restrictions on the printing method of the inkjet head; it can be either a single-pass type or a scanning type. However, considering its effectiveness for high-speed printing, a single-pass type is preferred. A single-pass inkjet recording method is a printing method in which all dots used to form pixels are ejected as the fabric passes under an inkjet head unit in a single pass. As a means of implementing a single-pass printing method, a line printhead type inkjet head is preferred.

[0190] [Inkjet printing equipment]

[0191] First, an example of an inkjet printing apparatus applicable to the inkjet printing method of the present invention will be described with reference to the accompanying drawings.

[0192] Figure 1 This is a schematic diagram illustrating the configuration of an inkjet printing apparatus P applicable in the inkjet printing method used in the embodiments described later, and a portion of the process of printing on fabric using an impregnation liquid and colored ink.

[0193] The inkjet printing apparatus P includes a first head carrier 1 and a second head carrier 2. The first head carrier 1 houses inkjet heads (hereinafter simply referred to as heads) filled with impregnation liquid. The second head carrier 2 houses multiple heads filled with various colors of ink. The fabric 3 is conveyed in the conveying direction shown in the figure via conveyor rollers 4 and 5. Under the control of the control unit 6, the impregnation liquid adheres to the fabric 3, and then the color ink adheres to form a printed image.

[0194] (Cloth)

[0195] Regarding the raw materials constituting fabric 3, there are no particular limitations as long as they contain fibers that can be dyed with dyes. However, the raw materials constituting fabric 3 are preferably selected from at least one of cotton, silk, linen, wool, nylon fibers, rayon fibers, acetate fibers, polyester fibers, and blends thereof. Fabric 3 can be a product made from the fibers listed above into any form, such as woven fabric, knitted fabric, or nonwoven fabric. In addition, fabric 3 is preferably made of 100% fibers that can be dyed with dyes, and blended fabrics or blended nonwoven fabrics can also be used as fabric 3. Furthermore, the thickness of the yarn constituting fabric 3 is preferably in the range of 10 to 100 dB.

[0196] There are no particular limitations on the combination of fabric 3 and dye. Examples of possible combinations include reactive dyes with cellulose-based fibers (cotton, linen, rayon, etc.), acid dyes with silk, wool, nylon fibers, basic dyes with acrylic fibers, direct dyes with cotton, linen, rayon, and disperse dyes with polyester fibers. Among these, combinations of reactive dyes with cellulose-based fibers and acid dyes with silk, wool, or nylon fibers are preferred. Such combinations tend to further suppress the difference in color development between the front and back surfaces of the printed material.

[0197] (head)

[0198] As described above, the inkjet printing apparatus P applies the impregnation liquid and colored ink to the fabric 3 through the heads respectively. By applying the impregnation liquid and colored ink separately through the heads, the necessary amount of impregnation liquid and colored ink can be applied evenly and without unevenness to the necessary areas.

[0199] Regarding the head used to apply the impregnating liquid and colored ink to the fabric 3, such as Figure 1 As illustrated in the example, the heads for applying the impregnation liquid are mounted on separate, independent brackets. When the heads for applying the impregnation liquid are mounted on separate brackets, a drying device for drying the impregnation liquid applied to the fabric 3 can be installed between the two brackets. It should be noted that the heads for applying the impregnation liquid and the colored ink can be mounted on the same bracket.

[0200] (Control Department)

[0201] The control unit 6 controls the various components that make up the inkjet printing apparatus P. The control unit 6 includes a CPU (Central Processing Unit), RAM (Random Access Memory), and ROM (Read Only Memory).

[0202] The CPU reads various programs and data corresponding to the processing content from storage devices such as ROM and executes them. Furthermore, the CPU controls the operation of various parts of the inkjet printing apparatus P based on the processing content being executed. RAM temporarily stores various programs and data processed by the CPU. ROM stores various programs and data read by the CPU, etc. ROM is a non-volatile storage device such as HDD (Hard Disk Drive), SSD (Solid State Drive), or flash memory.

[0203] It should be noted that the examples disclosed above use hard disks, non-volatile semiconductor memory, etc., as computer-readable media for the program involved in this invention, but the invention is not limited to these examples. Other computer-readable media can be portable recording media such as CD-ROMs. Furthermore, carrier waves (transmission waves) are also used as the medium for providing data of the program involved in this invention via communication lines.

[0204] (Inkjet printing process)

[0205] Secondly, based on Figure 2 The flowchart shown illustrates the inkjet printing method of the present invention.

[0206] First, the process of applying the impregnation liquid to the fabric 3, which is the printed material, is carried out (step S101).

[0207] When applying the impregnation liquid to fabric 3, it can be applied to the surface of fabric 3, the back side, or both via inkjet printing. Alternatively, the impregnation liquid can be applied to the entire surface of fabric 3, or selectively to areas where colored ink is applied.

[0208] As for the control unit 6, it functions as a discharge control unit to control the amount of impregnating liquid adhering (coating amount) of the application head. Specifically, the control head is configured such that the amount of impregnating liquid adhering to the fabric 3 is approximately inversely proportional to the amount of colored ink adhering in the colored ink discharge area during the subsequent colored ink application process. More specifically, for example, the amount of colored ink adhering in the first colored ink discharge area and the amount of impregnating liquid adhering in the second colored ink discharge area are (A1, B1) and (A2, B2), respectively, and A1 > A2. In this case, the control unit 6 controls the head so that the amount of impregnating liquid adhering satisfies the following formula (1).

[0209] B1 < B2…(1)

[0210] By setting the amount of penetrating liquid to satisfy Equation (1), when the color difference between the surface concentration of the colored ink discharge area and the fabric 3 is set to α, and the color difference between the back concentration and the fabric 3 is set to β, an image with excellent penetrability can be formed with β / α being 0.6 or more and 1.0 or less.

[0211] More specifically, regarding control unit 6, the amount of colored ink adhering is A [g / m 2 The maximum adhesion amount of the impregnating liquid is D [g / m]. 2 In the case of [ ], the amount of penetrating liquid B[g / m] is set based on the following formula (2). 2 ].

[0212] B=min(D,max(C-γA,0))…(2)

[0213] In the above formula (2), C[g / m 2 The setpoint is the sum of the amount of colored ink adhered (A) and the amount of penetrating liquid adhered (B). For the control unit 6, after applying the maximum amount of penetrating liquid to the fabric 3 beforehand, test patches (test images) with different amounts of colored ink are formed and obtained using a colorimeter or the like. Then, the control unit 6 reads the back concentration and bleeding condition, and sets the setpoint C based on the most suitable sum of the amount of colored ink adhered and the maximum amount of penetrating liquid adhered. Thus, in this embodiment, the control unit 6 functions as a reading unit for reading the image formed on the fabric 3.

[0214] Alternatively, the control unit 6 can be configured to set a setting value C by forming test patches of colored ink with the maximum amount of adhesion in each area after applying impregnating liquid with different adhesion amounts to the fabric 3.

[0215] Furthermore, the maximum amount of impregnating liquid adhering to D increases proportionally with the printing resolution. Therefore, by simultaneously setting the printing resolution, the maximum amount of impregnating liquid adhering to D can also be set. In this configuration, the control unit 6 functions as an image forming control unit for forming a test image on the fabric 3, a setting unit for setting a setting value C based on the reading results of the test image, and a setting unit for the printing resolution. It should be noted that the printing resolution is not limited to a configuration set based on the formation of the test image, but can also be a configuration using a preset resolution.

[0216] Furthermore, γ in equation (2) above is a specified value, which is at least any positive integer. The value of γ can be arbitrarily set. Figures 3 to 6 The slope of the straight line shown.

[0217] Figures 3 to 6 An example of a coordinate graph that satisfies equation (2). Figure 3 and Figure 5 This is a coordinate graph showing the application of the penetrating liquid when C-γF > 0, i.e., when the amount of colored ink adhered is at its maximum value F. Additionally, Figure 4 and Figure 6 This is a coordinate graph showing the case where C-γF≤0, i.e., the amount of colored ink adhering is at its maximum value F, without any penetrating liquid. Additionally, Figure 3 and Figure 4 This is a coordinate graph when C > D. Figure 5 and Figure 6 The coordinate graph is for the case where C ≤ D.

[0218] To explain, in Figures 3 to 6 In this context, the minimum value for the amount of penetrating liquid adhering to the surface is set to C-γA or 0, but it is not limited to these values; a specified value E [g / m] can be set.2 In this case, the amount of penetrating liquid B is set based on the following formula (3).

[0219] B=min(D,max(C-γA,E))…(3)

[0220] An example of a coordinate graph satisfying equation (3) is shown below. Figure 7 and Figure 8 . Figure 7 The coordinate graph for the case where C > D. Figure 8 The coordinate graph for the case where C ≤ D.

[0221] To explain, in Figures 3 to 8 The example illustrates a linear relationship between the amount of colored ink (A) and the amount of penetrating liquid (B), but it is not limited to this. For example, ... Figure 9 As shown, the amount of colored ink A and the amount of penetrating liquid B can be made to have a quadratic relationship based on the setting of γ.

[0222] Furthermore, regarding the relationship between the amount of colored ink adhered (A) and the amount of penetrating liquid adhered (B), as long as the aforementioned effects of this invention are satisfied, it is not necessary to satisfy the condition that B1 < B2 when A1 > A2. That is, from a macroscopic perspective, it is sufficient as long as there is a tendency for B1 < B2 when A1 > A2; basically, as... Figure 10 As shown, although there are differences in the amount of colored ink adhered (A), there are multiple regions where the amount of penetrant (B) is approximately equal. Alternatively, there may be regions where the amount of penetrant (B) is slightly greater in areas where the amount of colored ink adhered (A) is greater than in areas where the amount of penetrant (A) is less. However, when the amount of colored ink adhered is A1 < A2, it is preferable that there are no regions where B1 < B2.

[0223] In addition, Figures 3 to 10 The example illustrates a case where the amount of penetrant B adhering to the colored ink is 0 and the amount of penetrant B is C or D, but it is not limited to this. That is, in the non-drainage area of ​​the colored ink, the amount of penetrant B adhering to the penetrant can be 0, meaning that the penetrant may not be drained.

[0224] Next, for the fabric 3 that has been treated with impregnation liquid in the impregnation liquid application process, a color ink application process is performed to apply colored ink and form an image before color development (step S102). For example, while moving the fabric 3 relative to the second head holder 2 with multiple heads, droplets of each color ink are ejected from the head. Then, by flicking the ink droplets off the entire (solid image) or any area of ​​the fabric 3, an image before color development is formed. It should be noted that when using multiple colors of ink to form the image, the ink droplets of each color can be ejected separately or simultaneously. In addition, the bleeding of the image before color development can also be suppressed by applying colored ink by heating the fabric 3.

[0225] Furthermore, after the impregnation liquid application step, the colored ink can be applied in the colored ink application step after at least a portion of the impregnation liquid has been dried, or the impregnation liquid application step and the colored ink application step can be performed in a continuous, on-demand manner, but the latter is preferred. It should be noted that the continuous, on-demand manner referred to in this invention includes, for example... Figure 1 The illustration indicates that the impregnation process, the color ink application process, and the subsequent color development, washing, and drying processes are carried out continuously on the same line without cutting the fabric 3 in the middle.

[0226] After the color ink application process, the fabric 3, which has an image before color development, is subjected to high-temperature steam to perform a color development process (step S103) that fixes the ink onto the fibers of the fabric 3. Through the color development process, the original hue of the ink is revealed. Methods for fixing the ink onto the fibers of the fabric 3 include, for example, steam method, HT steam method, HP steam method, thermosetting method, alkaline pad steam method, alkaline blot steam method, alkaline shock method, and alkaline cold fixing method.

[0227] In steam treatment using high-temperature steam, a large amount of liquid water is present. Therefore, if the heating temperature is too low, the reactive dyes contained in the dark and light inks can easily form hydrogen bonds with the liquid water outside the fabric 3, and sometimes they are washed away with the water, resulting in insufficient dyeing. Therefore, in steam treatment, the heating temperature is preferably 95°C or higher, more preferably 100°C or higher. For example, cellulose fibers are preferably treated at 95 to 105°C for 5 to 15 minutes. In addition, the fabric 3 to which the ink has been applied can develop color immediately or after a specified time.

[0228] After the color development process, a removal process (step S104) is performed to remove the dye and impregnation liquid that failed to dye the fabric 3. The undyed dye can be removed using conventionally known washing methods, and the washing method is appropriately selected depending on the type of dye constituting the colored ink and the type of fabric 3. For example, if the fabric 3 is made of cellulose fibers, it is generally treated with a soap bath containing a non-ionic detergent after water washing and hot water washing. By removing the undyed dye, washing fastness, water fastness, and perspiration fastness are easily improved.

[0229] After the washing process, a drying process (step S105) is performed to dry the washed fabric 3. There are no particular limitations on the drying method. The fabric 3 can be dried by wringing out the washed fabric 3 and letting it air dry, or by using a dryer (heated roller, iron, etc.).

[0230] To explain, before the impregnation liquid application step in step S101, a pretreatment step can be provided to prevent the colored ink on the fabric 3 from bleeding and to obtain a clear image. In the pretreatment step, a pretreatment agent containing a water-soluble polymer, which is used as a paste, is applied to the fabric 3 in advance. Methods for applying the pretreatment agent include padding, coating, and spraying.

[0231] Furthermore, a drying process for drying the impregnating liquid and the colored ink can be provided between the impregnation liquid application process in step S101 and the colored ink application process in step S102, and between the colored ink application process in step S102 and the color development process in step S103. Examples of drying methods include air convection, direct contact with the heated roller (heating roller direct contact method), and irradiation.

[0232] Example

[0233] The present invention will now be specifically described through examples, but the invention is not limited thereto. It should be noted that the use of "parts" or "%" in the examples indicates "parts by mass" or "% by mass" unless otherwise specified. Furthermore, unless otherwise stated, all operations are performed at room temperature (25°C).

[0234] (Preparation of the impregnation solution)

[0235] In a preparation container, 30.0% diethylene glycol monobutyl ether, 2.0% Prokisel GXL (manufactured by Nippon Co., Ltd., 1,2-benzisothiazolin-3-one lonza), and 3.0% Orfin E1010 (manufactured by Nissin Chemical Industry Co., Ltd., an alkynyl diol surfactant) were added. Then, deionized water was added to make the mixture 100% and stirred thoroughly. The resulting solution was filtered through a 1µm filter to obtain the impregnation solution.

[0236] (Preparation of colored inks)

[0237] In a preparation container, 20.0% ethylene glycol, 10.0% glycerin, 20.0% reactive black 5, 0.05% E1010, and 0.1% prokicidal GXL were added. Then, deionized water was added to make the mixture 100% and stirred thoroughly. The resulting solution was filtered through a 1µm filter to obtain colored ink (black ink).

[0238] This impregnating liquid and colored ink are passed through Figure 1 The inkjet printing device P shown ejects ink, thereby printing on fabric 3, which is a fine cotton cloth. More specifically, based on... Figures 3 to 8 The coating amount control method shown is used to control the amount of colored ink adhering from 0 g / m². 2 Up to 24g / m 2 per 2g / m 2 The coating amount changes while printing test charts. In this embodiment, the combination of the set value C, the maximum adhesion amount of the impregnating liquid D, the minimum adhesion amount of the impregnating liquid E, the maximum adhesion amount of the colored ink F, and the specified value γ in each coating amount control method is shown in Table I.

[0239] [Table 1]

[0240] Table I

[0241]

[0242] To clarify, in this embodiment, the first head holder 1 houses two inkjet heads (Konica Minolta KM1024 iSAE piezoelectric inkjet heads manufactured by Konica Minolta Corporation), and these heads are equipped with impregnating liquid. Additionally, the second head holder 2 houses two inkjet heads (Konica Minolta KM1024 iSAE piezoelectric inkjet heads manufactured by Konica Minolta Corporation), and these heads are equipped with color ink.

[0243] After printing the test chart, the color development process, removal process, and drying process are performed sequentially to produce a product that is consistent with... Figures 3 to 8 The coating amount control method shown corresponds to the samples in Examples 1-6.

[0244] In addition, samples of Comparative Examples 1-3 were prepared as follows.

[0245] (Comparative Example 1)

[0246] The amount of impregnating liquid adhering is constant at 20 g / m. 2 While increasing the amount of colored ink adhering to 0g / m 2 Up to 24g / m 2 per 2g / m 2 The location was changed while printing test charts.

[0247] (Comparative Example 2)

[0248] The amount of impregnating liquid adhering is constant at 5 g / m. 2 While increasing the amount of colored ink adhering to 0g / m 2 Up to 24g / m 2 per 2g / m 2 The location was changed while printing test charts.

[0249] (Comparative Example 3)

[0250] On the one hand, the adhesion of both the penetrant and the colored ink was reduced from 0 g / m 2 Up to 24g / m 2 per 2g / m 2 The location was changed while printing test charts.

[0251] [Experiment 1. Evaluation of Permeability]

[0252] Then, the surface concentration, back concentration, and blank area of ​​fabric 3 of each sample were measured using a reflectance density meter (manufactured by X-rite). α (color difference between surface concentration and fabric 3) and β (color difference between back concentration and fabric 3) were determined from these measurements, and β / α was calculated. The permeability of each example and comparative example was then evaluated. Regarding permeability, a β / α value of 0.6 or higher and 1.0 or lower was designated as G (Good), and a value less than 0.6 or greater than 1.0 was designated as NG (No Good).

[0253] [Experiment 2. Infiltration Evaluation]

[0254] In addition, the bleeding at the boundary between the printed and unprinted areas of each sample of fabric 3 was visually evaluated to assess the bleeding suppression effect of each embodiment and comparative example. Regarding the bleeding suppression effect, a case where no bleeding was observed at the boundary was designated as G, and a case where bleeding was observed at the boundary was designated as NG.

[0255] [Experiment 3. Evaluation of Color Development]

[0256] Furthermore, in accordance with JIS Z 8730-2009, a colorimeter (X-Rite 938) was used to measure the surface reflectance L* value of the test chart image of each sample, thereby evaluating the color development of each embodiment and comparative example. Regarding color development, a difference (absolute value) of L* from the reference sample without impregnation liquid coating was defined as G, and a difference of 5.0 or more was defined as NG.

[0257] The results of experiments 1-3 are shown in Table II.

[0258] Table 2

[0259] Table II

[0260]

[0261] [evaluate]

[0262] As can be seen from Examples 1-6 and Comparative Examples 1-3, when the relationship between the amount of colored ink adhering in the two regions is A1 > A2, by controlling the amount of penetrating liquid adhering to make B1 < B2, printing and dyeing with excellent penetrability, bleed suppression and color development of colored ink can be achieved.

[0263] Industrial availability

[0264] This invention enables inkjet printing apparatus, inkjet printing method, and recording medium to suppress ink bleeding and reduce surface concentration even when using an impregnation solution.

Claims

1. An inkjet printing apparatus, comprising: Multiple nozzles that discharge impregnating liquid and colored ink into the fabric, and A discharge control unit that controls the discharge of the impregnating liquid using the head. The amount of the colored ink adhered to is set as A [g / m]. 2 The amount of the impregnating liquid adhering to the surface is set as B [g / m]. 2 When the discharge control unit controls the discharge of the impregnation liquid from the head, the amount of colored ink and the amount of impregnation liquid adhering in the first colored ink discharge area are A1 and B1 respectively, and the amount of colored ink and the amount of impregnation liquid adhering in the second colored ink discharge area are A2 and B2 respectively. When A1 > A2, the following equation (1) is satisfied: B1 < B2…(1).

2. The inkjet printing apparatus according to claim 1, wherein, The discharge control unit controls the discharge of the impregnating liquid from the head such that when the surface concentration of the colored ink discharge area and the color difference of the fabric are set as α, and the back concentration of the colored ink discharge area and the color difference of the fabric are set as β, 0.6≤β / α≤1.0 is satisfied.

3. The inkjet printing apparatus according to claim 2, wherein, The discharge control unit sets the set value to C [g / m³]. 2 The maximum adhesion amount of the impregnating liquid is set to D [g / m]. 2 When any positive integer is set as γ, the amount of the penetrating liquid B is set based on the following formula (2). B=min(D, max(C-γA, 0))...(2).

4. The inkjet printing apparatus according to claim 2, wherein, The discharge control unit sets the set value to C [g / m³]. 2 The maximum adhesion amount of the impregnating liquid is set to D [g / m]. 2 ] , set any positive integer as γ, and set the minimum adhesion amount of the impregnation liquid as E [g / m 2 When [the amount of the penetrating liquid adhering to the liquid] is determined based on the following formula (3), the amount B of the penetrating liquid is set. B=min(D, max(C-γA, E))...(3).

5. The inkjet printing apparatus according to claim 3 or 4, wherein, The discharge control unit controls the head so that the impregnation liquid is not discharged in the non-discharge area of ​​the colored ink.

6. The inkjet printing apparatus according to any one of claims 2 to 4, wherein, The multiple heads dispense the colored ink of multiple colors.

7. The inkjet printing apparatus according to claim 3 or 4, wherein, The discharge control unit sets the maximum amount of the impregnating liquid adhering to it based on the printing resolution.

8. The inkjet printing apparatus according to claim 7, comprising: An image forming control unit that forms a predetermined test image on the fabric by controlling the discharge of the colored ink using the head; The reading section reads the test image formed on the fabric; and The setting unit sets the print resolution and the set value based on the reading results of the test image using the reading unit.

9. The inkjet printing apparatus according to claim 1, wherein, The impregnation solution contains a surfactant, and the total content of the surfactant in the impregnation solution is 2.0% or more.

10. The inkjet printing apparatus according to claim 9, wherein, The total content of the surfactant in the impregnation solution is less than 5.0%.

11. The inkjet printing apparatus according to claim 10, wherein, The surfactant is an alkynyl diol surfactant.

12. The inkjet printing apparatus according to claim 1, wherein, The colored ink contains dye.

13. An inkjet printing method, comprising using an inkjet printing apparatus, wherein the inkjet printing apparatus has multiple heads for discharging impregnating liquid and colored ink onto the fabric. in, Inkjet printing methods include the following control steps: The amount of the colored ink adhered to is set as A [g / m]. 2 The amount of the impregnating liquid adhering to the surface is set as B [g / m]. 2 When the head discharging the impregnating liquid is controlled, the amount of colored ink and the amount of impregnating liquid adhering in the first colored ink discharge area are A1 and B1 respectively, and the amount of colored ink and the amount of impregnating liquid adhering in the second colored ink discharge area are A2 and B2 respectively. When A1 > A2, the following equation (1) is satisfied: B1 < B2…(1).

14. The inkjet printing method according to claim 13, wherein, The control step controls the discharge of the impregnating liquid from the head such that when the surface concentration of the colored ink discharge area and the color difference of the fabric are set as α, and the back concentration of the colored ink discharge area and the color difference of the fabric are set as β, 0.6≤β / α≤1.0 is satisfied.

15. The inkjet printing method according to claim 14, wherein, The control step involves setting the set value to C[g / m]. 2 The maximum adhesion amount of the impregnating liquid is set to D [g / m]. 2 When any positive integer is set as γ, the amount of the penetrating liquid B is set based on the following formula (2). B=min(D, max(C-γA, 0))...(2).

16. The inkjet printing method according to claim 14, wherein, The control step involves setting the set value to C[g / m]. 2 The maximum adhesion amount of the impregnating liquid is set to D [g / m]. 2 ] , set any positive integer as γ, and set the minimum adhesion amount of the impregnation liquid as E [g / m 2 When [the amount of the penetrating liquid adhering to the liquid] is determined based on the following formula (3), the amount B of the penetrating liquid is set. B=min(D, max(C-γA, E))...(3).

17. The inkjet printing method according to claim 15 or 16, wherein, The control step controls the head so that the impregnation liquid is not discharged in the non-discharge area of ​​the colored ink.

18. The inkjet printing method according to claim 15 or 16, wherein, The control step sets the maximum amount of the impregnating liquid adhering to the print resolution.

19. The inkjet printing method according to claim 18, comprising: Image forming control step: forming a predetermined test image on the fabric by controlling the discharge of the colored ink using the head; The step of reading the test image formed on the fabric; The setting steps are based on the reading results of the test image generated in the reading steps to set the printing resolution and the setting value.

20. A computer-readable recording medium storing a program that functions as an ejection control unit for an inkjet printing apparatus equipped with multiple heads for ejecting impregnation liquid and colored ink onto fabric. The discharge control unit controls the head that discharges the impregnating liquid, such that the amount of colored ink adhering is set to A[g / m]. 2 The amount of the impregnating liquid adhering to the surface is set as B [g / m]. 2 When the amount of colored ink and the amount of impregnating liquid adhering in the first colored ink discharge area are A1 and B1 respectively, and the amount of colored ink and the amount of impregnating liquid adhering in the second colored ink discharge area are A2 and B2 respectively, and A1 > A2, the following equation (1) is satisfied: B1 < B2…(1).

21. The recording medium according to claim 20, wherein, The discharge control unit controls the discharge of the impregnating liquid from the head such that when the surface concentration of the colored ink discharge area and the color difference of the fabric are set as α, and the back concentration of the colored ink discharge area and the color difference of the fabric are set as β, 0.6≤β / α≤1.0 is satisfied.

22. The recording medium according to claim 21, wherein, The discharge control unit sets the set value to C [g / m³]. 2 The maximum adhesion amount of the impregnating liquid is set to D [g / m]. 2 When any positive integer is set as γ, the amount of the penetrating liquid B is set based on the following formula (2). B=min(D, max(C-γA, 0))...(2).

23. The recording medium according to claim 21, wherein, The discharge control unit sets the set value to C [g / m³]. 2 The maximum adhesion amount of the impregnating liquid is set to D [g / m]. 2 ] , set any positive integer as γ, and set the minimum adhesion amount of the impregnation liquid as E [g / m 2 When [the amount of the penetrating liquid adhering to the liquid] is determined based on the following formula (3), the amount B of the penetrating liquid is set. B=min(D, max(C-γA, E))...(3).

24. The recording medium according to claim 22 or 23, wherein, The discharge control unit controls the head so that the impregnation liquid is not discharged in the non-discharge area of ​​the colored ink.

25. The recording medium according to claim 22 or 23, wherein, The discharge control unit sets the maximum amount of the impregnating liquid adhering to it based on the printing resolution.

26. The recording medium according to claim 25, wherein, The computer of the inkjet printing apparatus functions as follows: An image forming control unit that forms a predetermined test image on the fabric by controlling the discharge of the colored ink using the head. The reading section reads the test image formed on the fabric. The setting unit sets the print resolution and the set value based on the reading results of the test image using the reading unit.

Images