Ink jet printing apparatus, ink jet printing method, and program

Abstract

To provide an inkjet printing apparatus, an inkjet printing method, and a program capable of suppressing bleeding of ink and reduction in surface density even when a penetrant is used.SOLUTION: The ink jet textile printing apparatus P includes a plurality of heads that discharge the penetrant liquid and the color ink onto the fabric 3, and the control unit 6 that functions as a discharge control unit that controls the discharge of the penetrant liquid by the heads. When the amount of the color ink applied is A [g / m2] and the amount of the penetrant applied is B [g / m2], the control unit 6 controls the discharge of the penetrant from the head so as to satisfy the following Expression (1) in a case in which the amount of the color ink applied and the amount of the penetrant applied in the first color ink discharge region are A1 and B1, respectively, the amount of the color ink applied and the amount of the penetrant applied in the second color ink discharge region are A2 and B2, respectively, and A1> A2. B1 <B2 (1) SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an inkjet textile printing apparatus, an inkjet textile printing method, and a program. [Background technology]

[0002] In recent years, inkjet printing, in which ink is ejected from an inkjet head and landed on the fabric, has become widely used as a method for printing images such as letters, pictures, and designs onto fabrics such as woven fabrics and nonwoven fabrics.

[0003] In textile printing, it is required that the surface of the fabric on which the ink has landed and the opposite back surface thereof have the same color tone, that is, that the printed ink penetrates to the back surface. When the printed ink penetrates to the back surface, the aesthetic appearance of the printed fabric is further improved.

[0004] Therefore, for example, Patent Documents 1 and 2 describe a configuration in which a penetrant liquid is applied to a fabric to allow the printed ink to penetrate to the back surface. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2022-014927 [Patent Document 2] Patent No. 7206699 Summary of the Invention [Problem to be solved by the invention]

[0006] However, when using a penetrant liquid, the ink penetrates to the back surface, which tends to reduce the surface density. While this problem can be solved by increasing the amount of ink applied, this causes the ink to bleed. Furthermore, the increased ink consumption increases printing costs.

[0007] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an inkjet printing apparatus, an inkjet printing method, and a program that can suppress ink bleeding and a decrease in surface density even when a penetrant liquid is used. [Means for solving the problem]

[0008] In order to solve the above problems, the invention described in claim 1 is an inkjet textile printing apparatus, a plurality of heads for ejecting penetrant liquid and color ink onto the fabric; a discharge control unit that controls the discharge of the penetrant liquid by the head, The amount of color ink applied is A [g / m 2 ], the amount of the penetrant solution applied is B [g / m 2 ], The ejection control unit controls the ejection of the penetrant liquid by the head so as to satisfy the following formula (1) when the amount of the color ink and the amount of the penetrant liquid attached in the first color ink ejection area are A1 and B1, respectively, and the amount of the color ink and the amount of the penetrant liquid attached in the second color ink ejection area are A2 and B2, respectively, and A1>A2. B1 <B2…(1)

[0009] The invention described in claim 2 is the inkjet textile printing apparatus described in claim 1, The ejection control unit controls the ejection of the penetrant liquid by the head so as to satisfy 0.6≦β / α≦1.0, where α is the color difference between the surface density of the color ink ejection area and the fabric, and β is the color difference between the back surface density of the color ink ejection area and the fabric.

[0010] The invention described in claim 3 is the inkjet printing apparatus described in claim 2, The discharge control unit sets the set value to C [g / m 2 ], the maximum amount of the penetrant attached is D [g / m 2 ], and when an arbitrary positive integer is set as γ, the amount B of the penetrant liquid applied is set based on the following formula (2). B=min(D, max(C-γA, 0))…(2)

[0011] The invention described in claim 4 is the inkjet textile printing apparatus described in claim 2, The discharge control unit sets the set value to C [g / m 2 ], the maximum amount of the penetrant attached is D [g / m 2 ], any positive integer is γ, the minimum amount of the penetrant E [g / m 2 When the above formula (3) is set, the amount B of the penetrant liquid to be applied is set based on the following formula (3). B=min(D, max(C-γA, E))…(3)

[0012] The invention described in claim 5 is the inkjet textile printing apparatus described in claim 3 or 4, The ejection control unit controls the head so as not to eject the penetrant liquid onto a non-color ink ejection area.

[0013] The invention described in claim 6 is the inkjet textile printing apparatus according to any one of claims 2 to 4, The plurality of heads eject the color inks of the plurality of colors.

[0014] The invention described in claim 7 is the inkjet textile printing apparatus described in claim 3 or 4, The discharge control unit sets the maximum amount of the penetrant liquid to be applied in accordance with the printing resolution.

[0015] The invention described in claim 8 is the inkjet printing apparatus described in claim 7, an image forming control unit that controls the ejection of the color ink from the head to form a predetermined test image on the fabric; a reading unit that reads the test image formed on the fabric; and a setting unit that sets the print resolution and the setting value based on the result of reading the test image by the reading unit.

[0016] The invention described in claim 9 is the inkjet textile printing apparatus described in claim 1, The penetrant contains a surfactant, and the total content of the surfactant in the penetrant is 2.0% or more.

[0017] The invention described in claim 10 is the inkjet printing apparatus described in claim 9, The total content of the surfactant in the impregnating solution is less than 5.0%.

[0018] An eleventh aspect of the present invention is the inkjet printing apparatus according to the tenth aspect, The surfactant is an acetylene glycol surfactant.

[0019] The invention described in claim 12 is the inkjet textile printing apparatus described in claim 1, The color ink contains a dye.

[0020] The invention described in claim 13 is An inkjet textile printing method using an inkjet textile printing apparatus having a plurality of heads that eject penetrant liquid and color ink onto fabric, The amount of color ink applied is A [g / m 2 ], the amount of the penetrant solution applied is B [g / m 2 ], The method includes a control step of controlling the head that ejects the penetrant liquid so as to satisfy the following formula (1) when the amount of the color ink and the amount of the penetrant liquid in the first color ink ejection area are A1 and B1, respectively, and the amount of the color ink and the amount of the penetrant liquid in the second color ink ejection area are A2 and B2, respectively, and A1>A2. B1 <B2…(1)

[0021] The invention described in claim 14 is a program, A computer for an inkjet printing apparatus having a plurality of heads for ejecting penetrant liquid and color ink onto fabric, The amount of color ink applied is A [g / m 2 ], the amount of the penetrant solution applied is B [g / m 2 ], When the amount of color ink adhered and the amount of penetrant liquid adhered in the first color ink ejection area are A1 and B1, respectively, and the amount of color ink adhered and the amount of penetrant liquid adhered in the second color ink ejection area are A2 and B2, respectively, and A1>A2, the device functions as an ejection control unit that controls the head that ejects the penetrant liquid so as to satisfy the following formula (1). B1 <B2…(1) [Effects of the Invention]

[0022] According to the present invention, even when a penetrant liquid is used, bleeding of ink and a decrease in surface density can be suppressed. [Brief explanation of the drawings]

[0023] [Figure 1] FIG. 1 is a schematic diagram illustrating an example of the configuration of an inkjet recording apparatus applicable to an inkjet textile printing method. [Figure 2] FIG. 1 is a process flow diagram showing an example of a printing process in an inkjet printing method. [Figure 3] 10 is a graph showing an example of the relationship between the amount of color ink adhered and the amount of penetrant liquid adhered. [Figure 4] 10 is a graph showing an example of the relationship between the amount of color ink adhered and the amount of penetrant liquid adhered. [Figure 5] 10 is a graph showing an example of the relationship between the amount of color ink adhered and the amount of penetrant liquid adhered. [Figure 6] 10 is a graph showing an example of the relationship between the amount of color ink adhered and the amount of penetrant liquid adhered. [Figure 7] 10 is a graph showing an example of the relationship between the amount of color ink adhered and the amount of penetrant liquid adhered. [Figure 8] 10 is a graph showing an example of the relationship between the amount of color ink adhered and the amount of penetrant liquid adhered. [Figure 9] 10 is a graph showing an example of the relationship between the amount of color ink adhered and the amount of penetrant liquid adhered. [Figure 10] 10 is a graph showing an example of the relationship between the amount of color ink adhered and the amount of penetrant liquid adhered. DETAILED DESCRIPTION OF THE INVENTION

[0024] An inkjet textile printing apparatus according to an embodiment of the present invention will be described in detail below with reference to the drawings. However, the scope of the invention is not limited to the illustrated examples. In the following description, components having the same functions and configurations are designated by the same reference numerals, and their description will be omitted. In addition, in this application, the symbol "to" is used to mean that the numerical values ​​before and after it are included as the lower limit and upper limit.

[0025] [Inkjet textile printing ink set] First, we will explain the ink set for inkjet textile printing (hereinafter also simply referred to as "ink set") ejected by the inkjet textile printing apparatus of the present invention. The ink set is composed of a penetrant liquid for inkjet textile printing (hereinafter also simply referred to as "penetrant liquid") and color inks for inkjet textile printing (hereinafter also simply referred to as "color inks"). The penetrant liquid contains at least a surfactant A, an organic solvent, and water, and the total content of surfactant A is 2.0 mass% or more. The color inks contain at least a dye. The total content of surfactant A in the penetrant liquid is 30 times or more and less than 80 times the total content of surfactant B in the color inks.

[0026] (penetrating liquid) The penetrant liquid according to the present invention contains a surfactant A, an organic solvent, and water. The surfactant A, the organic solvent, and other constituent materials of the penetrant liquid will be described in detail below.

[0027] [Surfactant A] In the present invention, the total content of surfactant A in the penetrant is 2% by mass or more. Note that the "total content of surfactant A" refers to the total mass of the penetrant containing surfactant A expressed in mass % when the total mass of the penetrant is taken as 100% by mass.

[0028] The total content of surfactant A is preferably in the range of 2% by mass or more and less than 10% by mass, and more preferably in the range of 2% by mass or more and less than 5% by mass.

[0029] The surfactant A according to the present invention may be composed of one type of surfactant or two or more types of surfactants. When the surfactant A is composed of two or more types of surfactants, the total mass of the two or more surfactants is defined as the total content of surfactant A in the penetrant liquid.

[0030] The surfactant A contained in the penetrant liquid is not particularly limited, but examples thereof include acetylene glycol surfactants, fluorine-based surfactants, silicone-based surfactants, etc. Among these, it is preferable to use acetylene glycol surfactants from the viewpoint of penetrating ability into fabrics.

[0031] {Acetylene glycol surfactant} The acetylene glycol surfactant is not particularly limited, but is preferably at least one selected from alkylene oxide adducts such as 2,4,7,9-tetramethyl-5-decyne-4,7-diol and 2,4,7,9-tetramethyl-5-decyne-4,7-diol, and alkylene oxide adducts such as 2,4-dimethyl-5-decyne-4-ol and 2,4-dimethyl-5-decyne-4-ol.

[0032] Acetylene glycol surfactants are also available as commercially available products. Examples include the E series, such as the Olfin 104 series, Olfin E1004, E1006, E1010, E1020, and E1030, Olfin PD-002W, Surfynol 465, and Surfynol 61 (all manufactured by Nissin Chemical Industry Co., Ltd.). The acetylene glycol surfactants may be used alone or in combination of two or more.

[0033] {Fluorosurfactants} Examples of fluorine-based surfactants that can be used include perfluoroalkyl sulfonates, perfluoroalkyl carboxylates, perfluoroalkyl phosphates, perfluoroalkyl ethylene oxide adducts, perfluoroalkyl betaines, and perfluoroalkyl amine oxide compounds. Examples of silicone-based surfactants that can be used include polysiloxane compounds and polyether-modified organosiloxanes.

[0034] In the ink set of the present invention, the total content of surfactant A contained in the inkjet textile printing penetrant liquid is preferably 30 times or more and less than 80 times, and particularly preferably 40 times or more and less than 60 times, the total content of surfactant B (described below) contained in the inkjet textile printing color inks.

[0035] The multiplier of the total content of each surfactant referred to in the present invention is expressed as a multiplier (concentration of surfactant A (mass%) / concentration of surfactant B (mass%)) when the total mass of the penetrant liquid or color ink is taken as 100 mass%.

[0036] In the present invention, the penetration of the color ink into the fabric is improved by setting the ratio of the concentration (mass %) of surfactant A to the concentration (mass %) of surfactant B within the range specified above, resulting in a printed textile having excellent color stability, such as resistance to color inhibition and color unevenness.

[0037] [Organic solvent] The penetrant liquid according to the present invention contains an organic solvent together with surfactant A. The total content of the organic solvents contained in the penetrant liquid according to the present invention is preferably 40% by mass or more, when the total mass of the penetrant liquid is 100% by mass.

[0038] The organic solvent applicable to the present invention is not particularly limited. For example, the organic solvent may be a glycol ether solvent, a nitrogen-containing solvent, an aprotic polar solvent, an alkyl polyol solvent, or a monoalcohol solvent. The organic solvent may be used alone or in combination of two or more.

[0039] {Alkyl polyol} In the present invention, it is preferred that at least one organic solvent is an alkyl polyol. The alkyl polyol applicable to the present invention is not particularly limited, but examples thereof 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) (the values ​​in parentheses indicate standard boiling points). Among these, alkyl polyols having a boiling point of 200° C. or less are preferred, such as propylene glycol (188° C.), 1,2-butanediol (193° C.), and ethylene glycol (197° C.).

[0040] The use of such alkyl polyols tends to further improve the reliability of preventing clogging when applying a penetrant liquid by an inkjet method. These alkyl polyols may be used alone or in combination of two or more. The content of the alkyl polyol is preferably 10 to 70% by mass, more preferably 20 to 60% by mass, based on 100% by mass of the penetrant liquid for inkjet textile printing.

[0041] {glycol ether} In the present invention, in addition to the alkyl polyol, glycol ether can be used as an organic solvent.The glycol ether is not particularly limited, but for example, 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), diethylene glycol dibutyl ether (256 ° C) can be mentioned (the number in parentheses indicates the standard boiling point). Among these, diethylene glycol monobutyl ether (boiling point 230° C.) and triethylene glycol monomethyl ether (boiling point 230° C.) are more preferable.

[0042] 〔water〕 The water is not particularly limited, and pure water such as ion-exchanged water, ultrafiltered water, reverse osmosis water, distilled water, or ultrapure water can be used. The content of water is not particularly limited and may be determined appropriately as needed, as long as it is contained as the balance of other components contained in the penetrant liquid. For example, the content of water may be in the range of 30 to 80% by mass relative to the total amount (100% by mass) of the inkjet printing penetrant liquid.

[0043] [Other additives] In addition to the above-mentioned additives, the penetrant solution according to the present invention may contain pH adjusters, chelating agents, moisturizing agents, antireducing agents, preservatives, antifungal agents, and the like.

[0044] Examples of preservatives and antifungal agents that can be added include aromatic halogen compounds (e.g., Preventol CMK, manufactured by Bayer), methylene dithiocyanate, halogen-containing nitrogen-sulfur compounds, and 1,2-benzisothiazolin-3-one (e.g., PROXEL GXL, manufactured by Lonza Japan).

[0045] As a pH adjuster, for example, urea, sodium hydroxide, etc. can be added.

[0046] [Physical properties of penetrant liquid] The viscosity of the penetrant liquid at 25°C is preferably 2 to 10 mPa·s. The viscosity of the penetrant liquid at 25°C is more preferably 4 to 8 mPa·s. The viscosity of the penetrant liquid at 25°C is even more preferably approximately 7 mPa·s. The viscosity of the ink composition can be determined by measurement using a vibration viscometer in accordance with JIS Z8809. The surface tension of the penetrant liquid is preferably within the range of 20 to 40 mN / m.

[0047] [Method for preparing the penetrant solution] The penetrant according to the present invention can be prepared by mixing the above-described components in any order, and then filtering or otherwise removing impurities as necessary. A suitable method for mixing the components is to sequentially add the components to a container equipped with a stirring device such as a mechanical stirrer or a magnetic stirrer, and then stir and mix them. Filtration can be performed, for example, by centrifugal filtration or filter filtration as necessary.

[0048] It is also preferable to subject the penetrant liquid according to the present invention to a degassing treatment. When the penetrant liquid is applied to a fabric by an inkjet method, if the penetrant liquid contains dissolved gas, fine bubbles are generated in the penetrant liquid when it is ejected from the inkjet head, causing ejection defects. Therefore, it is preferable to remove the dissolved gas from the penetrant liquid. Degassing methods can be broadly divided into physical methods such as boiling or reducing pressure, and chemical methods in which an absorbent is added to and mixed with the pretreatment ink, and an appropriate method can be selected and applied.

[0049] (color ink) The color ink according to the present invention contains a dye as a coloring material. The color ink further preferably contains a surfactant B. The color ink may also contain other ingredients such as organic solvents, ureas, sugars, pH adjusters, chelating agents, preservatives, and anti-rust agents.

[0050] [Colorant] In the present invention, the content of the coloring agent contained in the color ink is preferably 1 to 25% by mass, more preferably 2 to 20% by mass, of the total mass of the color ink. There are no particular limitations on the dyes that can be used in the color ink of the present invention, and disperse dyes, reactive dyes, acid dyes, direct dyes, etc. are used. The hues of the color inks that make up the color inks are preferably yellow, magenta, cyan, black, blue, green, and red. It is particularly preferable that the color inks use yellow, magenta, cyan, and black dyes.

[0051] Specific compounds of dyes, which are coloring materials preferably used in the present invention, are shown below, but the present invention is not limited to these exemplified compounds.

[0052] {disperse dye} Disperse dyes preferably used in the color inks according to the present invention are CIDisperse 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, C.I.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、 C.I.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、 C.I.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、 C.I.Disperse Green:9、 C.I.Disperse Brown:1、2、4、9、13、19、 CIDisperse 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, 9 1, 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, CIDisperse Black:1, 3, 10, 24, etc.

[0053] In inkjet printing methods using disperse dyes, when color development is achieved by high-temperature processing, it is preferable to select disperse dyes with good sublimation fastness, because if the dye sublimes onto the machine or the white area of ​​the fabric, it can cause staining.

[0054] {Reactive dyes} Reactive dyes preferably used in the color inks according to the present invention include: CIReactive Yellow:2, 3, 7, 15, 17, 18, 22, 23, 24, 25, 27, 37, 39, 42, 57, 69, 76, 81, 84, 85, 86, 87, 92, 9 5, 102, 105, 111, 125, 135, 136, 137, 142, 143, 145, 151, 160, 161, 165, 167, 168, 175, 176, CIReactive Orange:1, 4, 5, 7, 11, 12, 13, 15, 16, 20, 30, 35, 56, 64, 67, 69, 70, 72, 74, 82, 84, 86, 87, 91, 92, 93, 95, 107, CIReactive Red:2, 3, 3:1, 5, 8, 11, 21, 22, 23, 24, 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, CIReactive Violet:1, 2, 4, 5, 6, 22, 23, 33, 36, 38, CIReactive Blue:2, 3, 4, 7, 13, 14, 15, 19, 21, 25, 27, 28, 29, 38, 39, 41, 49, 50, 52, 63, 69, 71, 72, 77, 79, 89, 104, 109, 112, 113, 114, 116, 119, 120, 122, 137, 140, 143, 147, 160, 161, 162, 163, 168, 171, 176, 182, 184, 191, 19 4, 195, 198, 203, 204, 207, 209, 211, 214, 220, 221, 222, 231, 235, 236, CIReactive Green:8, 12, 15, 19, 21, CIReactive Brown:2, 7, 9, 10, 11, 17, 18, 19, 21, 23, 31, 37, 43, 46, CIReactive Black:5, 8, 13, 14, 31, 34, 39, etc.

[0055] {acid dye} Acid dyes that are preferably used in the color inks according to the present invention include: C.I.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、 C.I.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、 C.I.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、 C.I.Acid Violet:17、19、21、42、43、47、48、49、54、66、78、90、97、102、109、126、 C.I.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、 CIAcid Green:9, 12, 16, 19, 20, 25, 27, 28, 40, 43, 56, 73, 81, 84, 104, 108, 109, CIAcid Brown:2, 4, 13, 14, 19, 28, 44, 123, 224, 226, 227, 248, 282, 283, 289, 294, 297, 298, 301, 355, 357, 413, CIAcid 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, etc.

[0056] {direct dye} The direct dyes preferably used in the color inks according to the present invention include: CIDirect Yellow:8, 9, 10, 11, 12, 22, 27, 28, 39, 44, 50, 58, 86, 87, 98, 105, 106, 130, 137, 142, 147, 153, CIDirect Orange:6, 26, 27, 34, 39, 40, 46, 102, 105, 107, 118, CIDirect 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, CIDirect Violet:9, 35, 51, 66, 94, 95, CI Direct Blue:1, 15, 71, 76, 77, 78, 80, 86, 87, 90, 98, 106, 108, 160, 168, 189, 192, 193, 1 99, 200, 201, 202, 203, 218, 225, 229, 237, 244, 248, 251, 270, 273, 274, 290, 291, CIDirect Green: 26, 28, 59, 80, 85, CIDirect Brown:44, 44:1, 106, 115, 195, 209, 210, 212:1, 222, 223, CIDirect Black:17, 19, 22, 32, 51, 62, 108, 112, 113, 117, 118, 132, 146, 154, 159, 169, etc.

[0057] [Surfactant B] There are no particular limitations on the surfactant B that can be used in the color ink according to the present invention. For example, as with the surfactant A used in the penetrant liquid, acetylene glycol surfactants, fluorine-based surfactants, silicone-based surfactants, etc. can be used as the surfactant B.

[0058] When surfactant B is used in the color ink, it can be used alone or in combination of two or more types. Surfactant B is preferably added in the range of 0.001 to 1% by mass relative to the total mass of the color ink. By adding surfactant B in the above range, the surface tension of the color ink can be adjusted as desired.

[0059] [Organic solvent] The water-soluble organic solvent used in the color ink according to the present invention may be the same as the organic solvent used in the penetrant liquid. 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.

[0060] [Other additives] As with the penetrant liquid described above, various additives may be added to the color ink according to the present invention. For example, inorganic salts, pH adjusters, chelating agents, humectants, antireducing agents, preservatives, antifungal agents, etc. may be added to the color ink as additives. Furthermore, if necessary, additives that are typically used in inkjet inks, such as rust inhibitors such as benzotriazole, antioxidants, ultraviolet absorbers, oxygen absorbers, and solubilizing agents, may be added to the color ink.

[0061] {inorganic salts} The inorganic salt is not particularly limited, but for example, sodium chloride, sodium sulfate, magnesium chloride, magnesium sulfate, etc. can be added.

[0062] {Preservatives, antifungal agents, pH adjusters} Examples of preservatives and antifungals that can be added to the color ink include aromatic halogen compounds (e.g., Preventol CMK, manufactured by Bayer), methylene dithiocyanate, halogen-containing nitrogen-sulfur compounds, and 1,2-benzisothiazolin-3-one (e.g., PROXEL GXL, manufactured by Lonza Japan). Examples of pH adjusters that can be added to the color ink include urea and sodium hydroxide.

[0063] [Color Ink Liquid Properties] {pH} The color ink according to the present invention preferably has a pH of 7.0 or more and 11.0 or less. The color ink more preferably has a pH of 7.0 or more and 8.0 or less. When the pH of the color ink is within this range, the storage stability of the dye in the ink is improved, and the color development and hue of the resulting image are less likely to change.

[0064] {surface tension} In the present invention, from the viewpoint of balancing the printing quality and the reliability as an inkjet ink, the inkjet printing color ink preferably has a surface tension at 20°C in the range of 20 to 40 mN / m. Furthermore, the inkjet printing color ink more preferably has a surface tension at 20°C in the range of 30 to 36 mN / m. When the surface tension of the color ink is within this range, the inkjet printing has excellent ejection stability. Furthermore, when the color ink is applied to a fabric, it tends to wet and spread evenly across the fabric, and to penetrate more easily. This facilitates the fixation of the color ink to the fabric.

[0065] The surface tension can be measured, for example, by using an automatic surface tensiometer CBVP-Z (trade name, manufactured by Kyowa Interface Science Co., Ltd.) to check the static surface tension when a platinum plate is wetted with ink in an environment of 20°C.

[0066] {viscosity} The viscosity of the color ink at 20°C is preferably within the range of 1.5 to 10 mPa·s. Furthermore, the viscosity of the color ink at 20°C is more preferably within the range of 2 to 8 mPa·s. Furthermore, the viscosity of the color ink at 20°C is even more preferably within the range of 4 to 5.5 mPa·s. When the viscosity of the ink at 20°C is within the above range, the ink is more easily fixed when attached to fabric, and color development is improved.

[0067] In the present invention, the viscosity of the color ink can be measured using, for example, a cone-plate viscometer, such as the TVE-33LT viscometer manufactured by Toki Sangyo Co., Ltd.

[0068] [Method of preparing color inks] The color ink can be obtained by mixing the above-mentioned components in any order and, if necessary, removing impurities by filtration or the like. A suitable mixing method is to add the components sequentially to a container equipped with a stirring device such as a mechanical stirrer or a magnetic stirrer, and then stir and mix them. Filtration methods such as centrifugal filtration and filter filtration can be used as necessary.

[0069] [Inkjet printing method] The inkjet printing method of the present invention (hereinafter also simply referred to as "printing method") uses a penetrant liquid and color inks. The penetrant liquid contains at least a surfactant A, an organic solvent, and water, with the total content of surfactant A being 2.0 mass % or more. The color inks contain at least a dye. The method is characterized in that the penetrant liquid is applied to a fabric, and then the color inks are applied to form a printed image.

[0070] The textile printing method of the present invention is carried out by inkjet recording, in which ink droplets are ejected from an inkjet head. The inkjet head may be of an on-demand type or a continuous type. The ejection type of the inkjet head may be any type. Examples of inkjet ejection types include electro-mechanical conversion types (e.g., single cavity type, double cavity type, bender type, piston type, shear mode type, shared wall type, etc.) and electro-thermal conversion types (e.g., thermal inkjet type, bubble jet (registered trademark) type, etc.).

[0071] The printing method of the inkjet head is not particularly limited, and either a single-pass type or a scan type may be used. However, the single-pass type is preferred as the printing method because it is effective for high-speed printing. The single-pass type inkjet recording method is a printing method in which all dots for forming pixels are ejected when the fabric passes under one inkjet head unit once. As a means for achieving the single-pass type printing method, it is preferable to use a line-head type inkjet head.

[0072] [Inkjet printing device] First, an example of an ink-jet printing apparatus applicable to the ink-jet printing method of the present invention will be described with reference to the drawings.

[0073] FIG. 1 is a schematic diagram showing the configuration of an inkjet printing apparatus P applicable to the inkjet printing method used in the examples described later, and a part of the process of printing on fabric using penetrant liquid and color inks.

[0074] The inkjet printing apparatus P includes a first head carriage 1 and a second head carriage 2. The first head carriage 1 is equipped with an inkjet head (hereinafter simply referred to as a head) filled with penetrant liquid. The second head carriage 2 is equipped with multiple heads filled with color inks of various colors. The fabric 3 is transported in the transport direction shown in the figure by transport rollers 4 and 5. Under the control of a control unit 6, the inkjet printing apparatus P applies penetrant liquid to the fabric 3 and then applies color inks to form a printed image.

[0075] (fabric) The material constituting the fabric 3 is not particularly limited as long as it contains fibers that can be dyed with a coloring agent. However, the material constituting the fabric 3 is preferably at least one selected from cotton, silk, linen, wool, nylon fibers, rayon fibers, acetate fibers, polyester fibers, and blends thereof. The fabric 3 may be made from the above-mentioned fibers in any form, such as woven fabric, knitted fabric, or nonwoven fabric. It is preferable that the fabric 3 is made from 100% fibers that can be dyed with a coloring agent, but blended woven fabrics or blended nonwoven fabrics can also be used as the fabric 3. The thickness of the yarn constituting the fabric 3 is preferably in the range of 10 to 100 d.

[0076] The combination of the fabric 3 and the dye is not particularly limited. Examples of combinations of the fabric 3 and the dye include a reactive dye and a fiber mainly composed of cellulose (such as cotton, linen, or rayon), an acid dye and a fiber mainly composed of silk, wool, or nylon, a basic dye and an acrylic fiber, a direct dye and a fiber mainly composed of cotton, linen, or rayon, or a disperse dye and a polyester fiber. Among these, the combinations of a reactive dye and a fiber mainly composed of cellulose, and an acid dye and a fiber mainly composed of silk, wool, or nylon fiber are preferred. Such combinations tend to further suppress the difference in color development between the front and back surfaces of the printed fabric.

[0077] (head) As described above, the inkjet printing device P applies the penetrant liquid and the color inks by using the respective heads onto the fabric 3. By applying the penetrant liquid and the color inks by using the respective heads, the required amounts of penetrant liquid and color inks can be applied uniformly and evenly to the required areas.

[0078] The heads used to apply the penetrant liquid and the color ink to the fabric 3 are each mounted on a separate, independent carriage, as shown in Figure 1. When the head that applies the penetrant liquid is mounted on a separate carriage, a drying device that dries the penetrant liquid applied to the fabric 3 may be provided between the two carriages. Note that the heads that apply the penetrant liquid and the color ink may be mounted on the same carriage.

[0079] (Control unit) The control unit 6 controls each component of the inkjet printing apparatus P. The control unit 6 includes a CPU (Central Processing Unit), RAM (Random Access Memory), and ROM (Read Only Memory).

[0080] The CPU reads out various programs, data, etc. corresponding to the processing content from a storage device such as a ROM and executes them. The CPU also controls the operation of each part of the inkjet printing apparatus P according to the processing content executed. The RAM temporarily stores various programs, data, etc. processed by the CPU. The ROM stores various programs, data, etc. read out by the CPU, etc. The ROM is a non-volatile storage device such as an HDD (Hard Disk Drive), SSD (Solid State Drive), or flash memory.

[0081] Although the above describes an example in which a hard disk or a semiconductor nonvolatile memory is used as a computer-readable medium for the program according to the present invention, the present invention is not limited to this example. Other computer-readable media include portable recording media such as CD-ROMs. Furthermore, a carrier wave can also be used as a medium for providing the program data according to the present invention via a communication line.

[0082] (Inkjet printing process) Next, the ink-jet printing method of the present invention will be described with reference to the flowchart shown in FIG.

[0083] First, a penetrant liquid application step is performed in which a penetrant liquid is applied to the fabric 3, which is the printed material (step S101).

[0084] When applying the penetrant liquid to the fabric 3, the inkjet method may be used to apply the penetrant liquid to the front surface, the back surface, or both the front and back surfaces of the fabric 3. The penetrant liquid may be applied to the entire surface of the fabric 3, or may be applied to selected printing areas where color inks are to be applied.

[0085] The control unit 6 functions as a discharge control unit that controls the amount of penetrant liquid deposited (application amount) by the head. Specifically, the control unit controls the head so that the amount of penetrant liquid deposited on the fabric 3 is approximately inversely proportional to the amount of color ink deposited in the color ink ejection area in the subsequent color ink application process. More specifically, for example, assume that the amounts of color ink and penetrant liquid deposited in the first color ink ejection area and the second color ink ejection area are (A1, B1) and (A2, B2), respectively, with A1 > A2. In this case, the control unit 6 controls the head so that the amount of penetrant liquid deposited satisfies the following formula (1):

[0086] B1 <B2…(1)

[0087] By setting the amount of applied penetrant liquid so as to satisfy formula (1), it is possible to form an image with excellent penetrability, in which β / α is 0.6 or more and 1.0 or less, where α is the color difference between the surface density of the color ink ejection area and fabric 3, and β is the color difference between the back surface density and fabric 3.

[0088] More specifically, the control unit 6 calculates the amount of color ink applied as A [g / m 2 ], the maximum amount of penetrant attached is D [g / m 2 ], the amount of penetrant attached B [g / m 2 ] is set based on the following formula (2).

[0089] B=min(D, max(C-γA, 0))…(2)

[0090] In the above formula (2), C [g / m 2 ] is the sum (set value) of the color ink deposition amount A and the penetrant liquid deposition amount B. The control unit 6 applies the maximum deposition amount of penetrant liquid to the fabric 3 in advance, and then forms test patches (test images) of color inks with different deposition amounts and acquires them using a colorimeter or the like. The control unit 6 then reads the front and back densities and the degree of bleeding, and sets the set value C from the sum of the most suitable color ink deposition amount and the maximum penetrant liquid deposition amount. In this way, in this embodiment, the control unit 6 functions as a reading unit that reads the image formed on the fabric 3.

[0091] Conversely, the control unit 6 may apply penetrant liquids with different deposition amounts to the fabric 3, and then form test patches of color ink with the maximum deposition amount in each region to set the set value C.

[0092] Furthermore, the maximum amount D of applied penetrant liquid increases in proportion to the print resolution. Therefore, by simultaneously setting the print resolution, the maximum amount D of applied penetrant liquid can also be set. In this configuration, the control unit 6 functions as an image formation control unit that forms a test image on the fabric 3, and as a setting unit that sets the set value C and print resolution based on the results of reading the test image. Note that the print resolution is not limited to being set based on the formation of the test image, and may be set in advance.

[0093] In addition, γ in the above formula (2) is a predetermined value, which is at least an arbitrary positive integer. Depending on the value of γ, the gradient of the straight line shown in Figures 3 to 6 can be set arbitrarily.

[0094] Figures 3 to 6 are examples of graphs that satisfy formula (2). Figures 3 and 5 are graphs for the case where C-γF>0, that is, when the amount of color ink applied is the maximum value F, and when penetrant liquid is applied. Figures 4 and 6 are graphs for the case where C-γF≦0, that is, when the amount of color ink applied is the maximum value F, and when penetrant liquid is not applied. Figures 3 and 4 are graphs for the case where C>D, and Figures 5 and 6 are graphs for the case where C≦D.

[0095] In addition, in Figs. 3 to 6, the minimum value of the amount of the penetrant liquid is set to C-γA or 0, but it is not limited to this and may be set to a predetermined value E [g / m 2 In this case, the amount B of the penetrant liquid is set based on the following formula (3).

[0096] B=min(D, max(C-γA, E))…(3)

[0097] Examples of graphs that satisfy formula (3) are shown in Figures 7 and 8. Figure 7 is a graph in the case where C>D, and Figure 8 is a graph in the case where C≦D.

[0098] 3 to 8 illustrate the case where the amount A of color ink and the amount B of penetrant liquid have a linear function relationship, but the present invention is not limited to this. For example, as shown in Fig. 9, the amount A of color ink and the amount B of penetrant liquid may have a quadratic function relationship depending on the setting of γ.

[0099] In addition, regarding the relationship between the amount A of the color ink attached and the amount B of the penetration liquid, as long as the above effects of the present invention are satisfied, it is not necessarily required that B1 < B2 when A1 > A2. That is, macroscopically, it is sufficient to have a tendency such that B1 < B2 when A1 > A2. Substantially, as shown in FIG. 10, there may be a plurality of regions where there is a difference in the amount A of the color ink attached, but the amount B of the penetration liquid is substantially equal. Alternatively, there may be a region where the amount B of the penetration liquid in the region with a large amount A of the color ink attached is slightly larger than the amount B of the penetration liquid in the region with a small amount A of the color ink attached. However, when the amount of the color ink attached is A1 < A2, it is preferable that there is no region where B1 < B2.

[0100] Further, in FIGS. 3 to 10, although the case where the amount B of the penetration liquid becomes C or D when the amount A of the color ink attached is 0 is exemplified, it is not limited thereto. That is, in the non-ejection region of the color ink, the amount B of the penetration liquid may be 0, that is, the penetration liquid may not be ejected.

[0101] Next, a color ink application step of applying color ink to the fabric 3 to which the penetration liquid has been applied in the penetration liquid application step to form an image before coloring is performed (step S102). For example, while relatively moving the fabric 3 with respect to the second head carriage 2 equipped with a plurality of heads, each color ink droplet is ejected from the head. Then, by landing the ink droplets on the entire surface (solid image) or an arbitrary region of the fabric 3, an image before coloring is formed. When forming an image using a plurality of colors of ink, the ink droplets of each color may be ejected separately or simultaneously. Further, by heating the fabric 3 and applying the color ink, bleeding of the image before coloring may be suppressed.

[0102] Furthermore, after the penetrant liquid application step, the penetrant liquid may be at least partially dried and then the color ink may be applied in the color ink application step, or the penetrant liquid application step and the color ink application step may be performed continuously online, but the latter is preferred. Note that the term "continuous online" as used herein means that the penetrant liquid application step, the color ink application step, and the subsequent color development step, washing step, and drying step are performed continuously on the same line without cutting the fabric 3, as schematically shown in Figure 1.

[0103] After the color ink application step, a color development step (step S103) is performed in which high-temperature steam is applied to the fabric 3 on which the uncolored image is formed, thereby fixing the color material to the fibers of the fabric 3. The color development step develops the original hue of the ink. Methods for fixing the color material to the fibers of the fabric 3 include, for example, steaming, HT steaming, HP steaming, Thermofix, alkaline pad steaming, alkaline blotch steaming, alkaline shock, and alkaline coldfix.

[0104] In the steaming method using high-temperature steam, a large amount of liquid water is present. Therefore, if the heating temperature is too low, the reactive dye contained in the dark-colored ink or the light-colored ink is likely to hydrogen bond with the liquid water in addition to the fabric 3, and may be washed away with the water, resulting in insufficient dyeing. Therefore, in the steaming method, the heating temperature is preferably 95°C or higher, and more preferably 100°C or higher. For example, cellulosic fibers are preferably treated at 95 to 105°C for 5 to 15 minutes. Furthermore, the fabric 3 to which the ink has been applied may be allowed to develop color immediately or after a predetermined time has passed.

[0105] After the coloring step, a removal step is performed to remove the dye and penetrant liquid, which are coloring materials that have not been absorbed into the fabric 3 (step S104). Coloring materials that have not been absorbed into the fabric 3 can be removed by a conventionally known washing method, and the washing method is appropriately selected depending on the type of dye that constitutes the color ink and the type of fabric 3. For example, when the fabric 3 is made of cellulose fibers, it is common to wash the fabric 3 with water and hot water, then treat it in a soaping bath containing a nonionic detergent, and then wash it with hot water and water. Removing the unabsorbed dye tends to improve the wash fastness, water fastness, sweat fastness, etc.

[0106] After the washing step, a drying step is carried out (step S105) to dry the washed fabric 3. The drying method is not particularly limited, but the washed fabric 3 can be dried by wringing, hanging, or using a dryer (heat roll, iron, etc.).

[0107] Before the penetrant liquid application step in step S101, a pretreatment step may be performed to prevent bleeding of the color ink on the fabric 3 and obtain a clear image. In the pretreatment step, a pretreatment agent containing a water-soluble polymer as a sizing agent is applied to the fabric 3 in advance. Methods for applying the pretreatment agent include a pad method, a coating method, and a spray method.

[0108] Furthermore, a drying step for drying the penetrant liquid or the color ink may be provided between the penetrant liquid application step in step S101 and the color ink application step in step S102, or between the color ink application step in step S102 and the color development step in step S103. Examples of drying methods include an air convection method, a direct heating roll application method, and an irradiation method. [Example]

[0109] The present invention will be specifically described below using examples, but the present invention is not limited thereto. In the examples, the terms "parts" and "%" are used, but unless otherwise specified, they represent "parts by mass" or "% by mass." Unless otherwise specified, each operation was carried out at room temperature (25°C).

[0110] (Preparation of penetrant solution) A preparation vessel was charged with 30.0% diethylene glycol monobutyl ether, 2.0% Proxel GXL (1,2-benzisothiazolin-3-one, manufactured by Lonza Japan), and 3.0% Olfine E1010 (acetylene glycol surfactant, manufactured by Nissin Chemical Industry Co., Ltd.). Ion-exchanged water was then added to the mixture to make a total of 100%, and the mixture was thoroughly stirred. The resulting solution was filtered through a 1 μm filter to obtain a penetrant.

[0111] (Color ink preparation) A preparation vessel was charged with 20.0% ethylene glycol, 10.0% glycerin, 20.0% Reactive Black 5, 0.05% E1010, and 0.1% Proxel GXL. Ion-exchanged water was then added to bring the total to 100%, and the mixture was thoroughly stirred. The resulting solution was filtered through a 1 μm filter to obtain the color ink (black ink).

[0112] Such penetrant liquid and color inks were printed on a cotton broadcloth fabric 3 by ejecting them from an inkjet printing apparatus P as shown in Fig. 1. More specifically, the amount of color ink applied was controlled to 0 g / m based on the application amount control method shown in Figs. 2 from 24g / m 2 Up to 2g / m 2 In this example, the combinations of the setting value C, the maximum amount of applied penetrant liquid D, the minimum amount of applied penetrant liquid E, the maximum amount of applied color ink F, and the predetermined value γ for each application amount control method are as shown in Table I.

[0113] [Table 1]

[0114] In this embodiment, two heads (Konica Minolta piezo inkjet heads KM1024iSAE) are mounted on the first head carriage 1, and penetrant liquid is loaded into the heads. Also, two heads (Konica Minolta piezo inkjet heads KM1024iSAE) are mounted on the second head carriage 2, and color inks are loaded into the heads.

[0115] After printing the test chart, the coloring process, the removal process, and the drying process were carried out in this order to prepare samples of Examples 1-6 corresponding to the application amount control methods shown in FIGS.

[0116] Additionally, samples of the following comparative examples 1-3 were prepared. (Comparative Example 1) The amount of penetrating liquid applied is 20g / m 2 The color ink amount is constant at 0g / m 2 from 24g / m 2 Up to 2g / m 2 A test chart was printed while changing the temperature step by step. (Comparative Example 2) The amount of penetrant applied is 5g / m 2 The color ink amount is constant at 0g / m 2 from 24g / m 2 Up to 2g / m 2 A test chart was printed while changing the temperature step by step. (Comparative Example 3) Penetrant and color ink amounts are both 0g / m 2 from 24g / m 2 Up to 2g / m 2 A test chart was printed while changing the temperature step by step.

[0117] [Test 1. Penetration evaluation] Then, by measuring the surface concentration, back surface concentration of each sample, and the white portion of the fabric 3 using a colorimeter (manufactured by X-rite), α (the color difference between the surface concentration and the fabric 3) and β (the color difference between the back surface concentration and the fabric 3) were obtained, and β / α was calculated to evaluate the penetrability of each example and comparative example. The penetrability was defined as G (Good) when the value of β / α was 0.6 or more and 1.0 or less, and NG (No Good) when it was less than 0.6 or greater than 1.0.

[0118] [Test 2. Bleeding evaluation] Also, by visually evaluating the bleeding condition at the boundary between the printed area and the white portion of the fabric 3 of each sample, the bleeding suppression effect of each example and comparative example was evaluated. The bleeding suppression effect was defined as G when no bleeding was observed at the boundary portion, and NG when bleeding was observed at the boundary portion.

[0119] [Test 3. Color development evaluation] Also, by measuring the surface reflection lightness L* value of the test chart image of each sample using a colorimeter (X-Rite938) in accordance with JIS Z8730-2009, the color development of each example and comparative example was evaluated. The color development was defined as G when the difference (absolute value) of L* from the reference sample when no penetrant was applied was less than 5.0, and NG when it was 5.0 or more.

[0120] The results of Tests 1-3 are shown in Table II.

[0121]

Table 2

[0122] [Evaluation] From Examples 1-6 and Comparative Examples 1-3, it can be seen that when the relationship between the amounts of color ink attached in the two regions is A1>A2, by controlling the amount of penetrant attached so that B1<B2, excellent printing with respect to the penetrability, bleeding suppression, and color development of the color ink becomes possible.

Explanation of symbols

[0123] 3 Fabric 6. Control unit (ejection control unit, acquisition unit, image formation control unit) P Inkjet recording device

Claims

1. a plurality of heads for ejecting penetrant liquid and color ink onto the fabric; a discharge control unit that controls the discharge of the penetrant liquid by the head, The amount of color ink applied is A [g / m ２ ], the amount of the penetrant liquid attached is B [g / m ２ ], The inkjet printing device is configured such that, when the amount of color ink and the amount of penetrant liquid adhered in a first color ink ejection region are A1 and B1, respectively, and the amount of color ink and the amount of penetrant liquid adhered in a second color ink ejection region are A2 and B2, respectively, and A1 > A2, the ejection control unit controls the ejection of the penetrant liquid from the head so as to satisfy the following formula (1): B1 < B2 ... (1)

2. 2. The inkjet textile printing device according to claim 1, wherein the ejection control unit controls the ejection of the penetrant liquid from the head so as to satisfy 0.6≦β / α≦1.0, where α is a color difference between a surface density of the color ink ejection area and the fabric, and β is a color difference between a back surface density of the color ink ejection area and the fabric.

3. The discharge control unit sets the set value to C [g / m ２ ], the maximum amount of the penetrant attached is D [g / m ２ ], and an arbitrary positive integer is set as γ, the amount B of the applied penetrant liquid is set based on the following formula (2): B=min(D, max(C-γA, 0))...(2)

4. The discharge control unit sets the set value to C [g / m ２ ], the maximum amount of the penetrant attached is D [g / m ２ ], any positive integer is γ, the minimum amount of the penetrant E [g / m ２ 3. The ink-jet printing apparatus according to claim 2, wherein when the ink amount B is set as follows: B=min(D, max(C-γA, E))...(3)

5. 5. The inkjet textile printing device according to claim 3, wherein the ejection control unit controls the head so as not to eject the penetrant liquid onto a non-color ink ejection area.

6. The inkjet printing apparatus according to claim 2 , wherein the plurality of heads eject the color inks of a plurality of colors.

7. 5. The inkjet printing apparatus according to claim 3, wherein the ejection control unit sets a maximum amount of the penetrant liquid to be applied in accordance with a printing resolution.

8. an image forming control unit that controls the ejection of the color ink from the head to form a predetermined test image on the fabric; a reading unit that reads the test image formed on the fabric; The inkjet printing apparatus according to claim 7 , further comprising: a setting unit that sets the print resolution and the setting value based on a result of reading the test image by the reading unit.

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

10. 10. The ink-jet printing apparatus according to claim 9, wherein the total content of the surfactant in the penetrant liquid is less than 5.0%.

11. 11. The ink-jet printing apparatus according to claim 10, wherein the surfactant is an acetylene glycol surfactant.

12. The ink-jet printing apparatus according to claim 1 , wherein the color ink contains a dye.

13. An inkjet textile printing method using an inkjet textile printing apparatus having a plurality of heads that eject penetrant liquid and color ink onto fabric, The amount of color ink applied is A [g / m ２ ], the amount of the penetrant liquid attached is B [g / m ２ ], An inkjet textile printing method comprising a control step of controlling the head that ejects the penetrant liquid so as to satisfy the following formula (1) when the amount of the color ink and the amount of the penetrant liquid attached in a first color ink ejection region are A1 and B1, respectively, the amount of the color ink and the amount of the penetrant liquid attached in a second color ink ejection region are A2 and B2, respectively, and A1>A2: B1 < B2 ... (1)

14. A computer for an inkjet printing apparatus having a plurality of heads for ejecting penetrant liquid and color ink onto fabric, The amount of color ink applied is A [g / m ２ ], the amount of the penetrant liquid attached is B [g / m ２ ], A program that functions as an ejection control unit that controls the head that ejects the penetrant liquid so as to satisfy the following formula (1) when the amount of color ink and the amount of penetrant liquid attached in the first color ink ejection area are A1 and B1, respectively, the amount of color ink and the amount of penetrant liquid attached in the second color ink ejection area are A2 and B2, respectively, and A1 > A2. B1 < B2 ... (1)

Images