Method for producing printed textile and system for producing printed textile

Abstract

To provide a simpler pretreatment method for inkjet printing using an inkjet system for applying a pretreatment liquid.SOLUTION: A method for producing a printed textile comprises applying an ink to a fabric, the fabric having a region (1) to which a pretreatment liquid (A) containing at least one of an ink flocculant and an organic solvent having a boiling point of 180°C or higher is applied, and a region (2) that is at least one region selected from the group consisting of a region (2-1) where the application amount of the pretreatment liquid (A) per unit area is smaller than that of the region (1), a region (2-2) where a pretreatment liquid (B) having a lower ink flocculating power than the pretreatment liquid (A) is applied, and a region (2-3) where no pretreatment liquid is applied.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present disclosure relates to a method for producing a printed item and a system for producing a printed item. [Background technology]

[0002] Various methods are known for printing images such as letters, pictures, and designs on fabrics such as woven fabrics, knitted fabrics, and nonwoven fabrics, including screen printing, roller printing, transfer printing, and inkjet printing. These printing methods are appropriately selected and used depending on the type of fabric, the image design, the desired washing durability, the number of lots, and the like.

[0003] Patent Document 1 describes a towel that uses two printing methods, ink ribbon thermal transfer and screen printing, and makes it possible to determine the service life by utilizing the difference in washing fastness between the two printed images. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2023-146356 Summary of the Invention [Problem to be solved by the invention]

[0005] According to the method described in Patent Document 1, an ink ribbon thermal transfer printed image with poor washing fastness peels off before a screen printed image with high washing fastness, thereby changing the printed image over time. However, since the washing fastness is adjusted depending on the type of printing method, the range of image change is limited. Furthermore, the use of two printing methods, ink ribbon thermal transfer and screen printing, is cumbersome.

[0006] An object of the present disclosure is to provide a method and system for producing a printed item that are capable of controlling changes in a printed image over time. [Means for solving the problem]

[0007] One embodiment of the present disclosure relates to a method for producing a printed textile, comprising applying ink to a fabric having: a region (1) to which a pretreatment liquid (A) containing at least one of an ink aggregating agent and an organic solvent having a boiling point of 180°C or higher has been applied; and a region (2) which is at least one region selected from the group consisting of a region (2-1) to which a smaller amount of the pretreatment liquid (A) has been applied per unit area than in the region (1); a region (2-2) to which a pretreatment liquid (B) having lower ink aggregating power than the pretreatment liquid (A) has been applied; and a region (2-3) to which no pretreatment liquid has been applied. [Effects of the Invention]

[0008] According to the present disclosure, it is possible to provide a method for producing a printed item and a system for producing a printed item that are capable of controlling changes in a printed image over time. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic diagram of an example of a manufacturing system according to an embodiment. [Figure 2] FIG. 2 is an image of the printed image used in the examples. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments of the present disclosure will be described in detail, but it goes without saying that the present disclosure is not limited to these embodiments and that various modifications and changes may be made.

[0011] One embodiment of a method for producing a printed textile involves applying ink to a fabric having: a region (1) to which a pretreatment liquid (A) containing at least one of an ink coagulant and an organic solvent having a boiling point of 180°C or higher has been applied; and a region (2) that is at least one region selected from the group consisting of a region (2-1) to which a smaller amount of the pretreatment liquid (A) per unit area has been applied than in the region (1); a region (2-2) to which a pretreatment liquid (B) having lower ink coagulation strength than the pretreatment liquid (A) has been applied; and a region (2-3) to which no pretreatment liquid has been applied. This production method allows for differences in the coagulation strength, ink penetration into the fabric, and fixation properties between the regions (1) and (2), thereby enabling control of changes in the printed image over time. Specifically, the region (1) is a region where changes in the printed image over time are relatively large. On the other hand, the region (2) is a region where changes in the printed image over time are relatively small.

[0012] In one embodiment, further regions with different ink coagulation strength may be provided, such as region (3) which is one or more regions selected from the group consisting of region (3-1) where a smaller amount of pretreatment liquid (A) is applied per unit area than region (2-1) and region (3-2) where a pretreatment liquid (C) having a lower ink coagulation strength than the pretreatment liquid (B) is applied, and region (4) which is one or more regions selected from the group consisting of region (4-1) where a smaller amount of pretreatment liquid (A) is applied per unit area than region (3-1) and region (4-2) where a pretreatment liquid (D) having a lower ink coagulation strength than the pretreatment liquid (C) is applied.

[0013] There may be one or more regions (1) and (2) on the fabric, and there may also be one or more regions (3), (4), etc., which are optionally provided, on the fabric.

[0014] In one embodiment, the fabric to be printed on is not particularly limited, and a wide variety of fabrics can be used. Examples of fibers constituting the fabric include natural fibers such as cotton, silk, wool, and linen; chemical fibers such as polyester, acrylic, polyurethane, nylon, rayon, cupra, and acetate; and blends of these fibers. Examples of types of fabric include woven fabrics, knitted fabrics, and nonwoven fabrics.

[0015] In one embodiment, region (1) is a region to which a pretreatment liquid (A) containing at least one of an ink aggregating agent (hereinafter, the ink aggregating agent contained in the pretreatment liquid (A) may be referred to as “aggregating agent (A)”) and an organic solvent having a boiling point of 180° C. or higher (hereinafter, the organic solvent having a boiling point of 180° C. or higher contained in the pretreatment liquid (A) may be referred to as “organic solvent (A)”) has been applied.

[0016] The pretreatment liquid (A) contains at least one of a flocculant (A) and an organic solvent (A). One flocculant (A) may be used alone, or two or more types may be used in combination. Also, one organic solvent (A) may be used alone, or two or more types may be used in combination.

[0017] If it is desired to prevent the change over time of the printed image in region (1) from becoming too great, or to reduce the difference in the change over time of the printed image between region (1) and region (2), the pretreatment liquid (A) preferably contains either the flocculant (A) or the organic solvent (A). On the other hand, if it is desired to increase the change over time of the printed image in region (1) or to increase the difference in the change over time of the printed image between region (1) and region (2), the pretreatment liquid (A) preferably contains both the flocculant (A) and the organic solvent (A).

[0018] In one embodiment, in order to increase the change over time of the printed image in the region (1), the pretreatment liquid (A) preferably contains both the flocculant (A) and the organic solvent (A).

[0019] Examples of the flocculant (A) include metal salts, cationic polymers, and organic acids. Examples of the metal salts include metal salts composed of metal ions and anions. Examples of the metal ions include Na + , K. + Monovalent metal ions such as Ca 2+ , Mg 2+ , Cu 2+ , Ni 2+ , Zn 2+ , Ba 2+ Examples of the anion include polyvalent metal ions such as Cl - , NO3 - , CH3COO - , I - , Br - , ClO3 - The metal salts may be used alone or in combination of two or more.

[0020] Examples of cationic polymers include polyallylamine, polyallylamine sulfate, polyallylamine hydrochloride, allylamine diallylamine copolymer, allylamine diallylamine copolymer sulfate, allylamine diallylamine copolymer hydrochloride, allylamine dimethylallylamine copolymer, allylamine dimethylallylamine copolymer sulfate, allylamine dimethylallylamine copolymer hydrochloride, diallylamine, diallylamine sulfate, diallylamine hydrochloride, methyl diallylamine amide, methyl diallylamine amide sulfate, methyl diallylamine amide hydrochloride, diallylamine sulfur dioxide copolymer, diallylamine sulfur dioxide copolymer sulfate, diallylamine sulfur dioxide copolymer hydrochloride, methyl diallylamine sulfur dioxide copolymer, methyl diallylamine sulfur dioxide copolymer sulfate, methyl diallylamine sulfur dioxide copolymer hydrochloride, polydimethyl diallyl ammonium chloride, etc. One type of cationic polymer may be used alone, or two or more types may be used in combination.

[0021] Examples of organic acids include formic acid, acetic acid, lactic acid, oxalic acid, citric acid, malic acid, ascorbic acid, etc. One type of organic acid may be used alone, or two or more types may be used in combination.

[0022] The flocculant (A) is appropriately selected depending on the type of fabric, the desired degree of change over time of the printed image, etc. For example, if it is desired to increase the change over time of the printed image in region (1) or to increase the difference in the change over time of the printed image between region (1) and region (2), the flocculant (A) preferably contains a metal salt, and more preferably contains a polyvalent metal salt formed from a polyvalent metal ion and an anion. Examples of polyvalent metal salts include calcium salts such as calcium chloride, calcium nitrate, and calcium acetate; and divalent metal salts such as magnesium chloride, magnesium nitrate, and calcium nitrate.

[0023] The proportion of metal salt in the flocculant (A) is preferably 50% by mass or more, more preferably 70% by mass or more, and even more preferably 90% by mass or more. Alternatively, 100% by mass of the flocculant (A) may be metal salt. Furthermore, the proportion of polyvalent metal salt in the flocculant (A) is preferably 50% by mass or more, more preferably 70% by mass or more, and even more preferably 90% by mass or more. Alternatively, 100% by mass of the flocculant (A) may be polyvalent metal salt.

[0024] On the other hand, if it is desired to prevent the change over time of the printed image in region (1) from becoming too large, or to reduce the difference in the change over time of the printed image between region (1) and region (2), it is preferable that the pretreatment liquid (A) contains at least one selected from a cationic polymer and an organic acid.

[0025] The content of the aggregating agent (A) in the pretreatment liquid (A) is adjusted appropriately depending on the type of aggregating agent (A), the presence or absence of an organic solvent (A), the composition of the ink to be applied after the pretreatment liquid, and other factors. For example, when the pretreatment liquid (A) contains both the aggregating agent (A) and the organic solvent (A), the content of the aggregating agent (A) in the pretreatment liquid (A) may be 1% by mass or more, 5% by mass or more, or 10% by mass or more. It may also be 40% by mass or less, 30% by mass or less, or 20% by mass or less. The content of the aggregating agent (A) in the pretreatment liquid (A) may be, for example, in the range of 1 to 40% by mass.

[0026] Furthermore, when the pretreatment liquid (A) contains both a flocculant (A) and an organic solvent (A), and the flocculant (A) contains a metal salt, the metal salt concentration of the pretreatment liquid (A) may be 0.1 mol / kg or more, 0.3 mol / kg or more, or 0.5 mol / kg or more. It may also be 10 mol / kg or less, 5 mol / kg or less, or 2 mol / kg or less. The metal salt concentration of the pretreatment liquid (A) may be, for example, in the range of 0.1 to 10 mol / kg.

[0027] On the other hand, when the pretreatment liquid (A) contains the flocculant (A) but not the organic solvent (A), the content of the flocculant (A) in the pretreatment liquid (A) may be 5% by mass or more, 10% by mass or more, or 20% by mass or more. It may also be 50% by mass or less, 40% by mass or less, or 30% by mass or less. The content of the flocculant (A) in the pretreatment liquid (A) may be, for example, in the range of 5 to 50% by mass.

[0028] Furthermore, when the pretreatment liquid (A) contains a flocculant (A) but does not contain an organic solvent (A), and the flocculant (A) contains a metal salt, the metal salt concentration of the pretreatment liquid (A) may be 0.1 mol / kg or more, 0.5 mol / kg or more, or 1 mol / kg or more. It may also be 10 mol / kg or less, 5 mol / kg or less, or 3 mol / kg or less. The metal salt concentration of the pretreatment liquid (A) may be, for example, in the range of 0.1 to 10 mol / kg.

[0029] The organic solvent (A) is not particularly limited in type, and a wide variety of organic solvents can be used as long as they have a boiling point of 180°C or higher. One type of organic solvent (A) may be used alone, or two or more types may be used in combination. The boiling point of the organic solvent (A) may be 185°C or higher. It may also be 300°C or lower, 250°C or lower, or 200°C or lower. The boiling point of the organic solvent (A) may be, for example, in the range of 180 to 300°C.

[0030] Examples of the organic solvent (A) include alcohol solvents, glycol solvents, glycerin-based solvents, acetin-based solvents, glycol ether-based solvents, ester-based solvents, and hydrocarbon-based solvents. In a more preferred embodiment, when the printing ink is an aqueous inkjet ink, the organic solvent (A) is preferably a water-soluble organic solvent. The degree of water solubility is preferably such that the organic solvent can be uniformly mixed with an equal volume of water at 20°C under 1 atmosphere.

[0031] Examples of water-soluble organic solvents having a boiling point of 180°C or higher include glycol solvents such as ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, polyethylene glycol, trimethylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol, and polypropylene glycol; glycerin-based solvents such as glycerin, diglycerin, triglycerin, and polyglycerin; acetin-based solvents such as triacetin; and glycol ether-based solvents such as diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monopropyl ether, diethylene glycol monobutyl ether, triethylene glycol monomethyl ether, triethylene glycol monoethyl ether, triethylene glycol monopropyl ether, triethylene glycol monobutyl ether, tetraethylene glycol monomethyl ether, tetraethylene glycol monoethyl ether, tetraethylene glycol dimethyl ether, and tetraethylene glycol diethyl ether.

[0032] The content of the organic solvent (A) in the pretreatment liquid (A) is adjusted appropriately depending on the type of organic solvent, the presence or absence of a flocculant (A), the composition of the ink to be applied after the pretreatment liquid, and other factors. For example, when the pretreatment liquid (A) contains both the organic solvent (A) and the flocculant (A), the content of the organic solvent (A) in the pretreatment liquid (A) may be 5% by mass or more, 10% by mass or more, or 15% by mass or more. It may also be 40% by mass or less, 35% by mass or less, or 30% by mass or less. The content of the organic solvent (A) in the pretreatment liquid (A) may be, for example, in the range of 5 to 40% by mass.

[0033] On the other hand, when the pretreatment liquid (A) contains the organic solvent (A) but not the flocculant (A), the content of the organic solvent (A) in the pretreatment liquid (A) may be 20% by mass or more, 30% by mass or more, or 40% by mass or more. It may also be 70% by mass or less, 65% by mass or less, or 60% by mass or less. The content of the organic solvent (A) in the treatment liquid (A) may be, for example, in the range of 20 to 70% by mass.

[0034] The pretreatment liquid (A) may contain other components in addition to the flocculant (A) and the organic solvent (A), such as an organic solvent having a boiling point of less than 180°C, water, a surfactant, a pH adjuster, a dispersant, a fixing agent, and a preservative.

[0035] Examples of organic solvents having a boiling point of less than 180°C include alcohol solvents, glycol solvents, glycerin-based solvents, acetin-based solvents, glycol ether-based solvents, ester-based solvents, and hydrocarbon-based solvents. In a more preferred embodiment, when the printing ink is an aqueous inkjet ink, the organic solvent having a boiling point of less than 180°C is preferably a water-soluble organic solvent. In terms of the degree of water solubility, it is preferred that the organic solvent be uniformly miscible with an equal volume of water at 20°C under 1 atmosphere, for example.

[0036] Examples of water-soluble organic solvents having a boiling point of less than 180°C include lower alcohol compounds such as methanol, ethanol, 1-propanol, isopropanol, 1-butanol, 2-butanol, isobutanol, and 2-methyl-2-propanol; and glycol ether solvents such as ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, ethylene glycol monobutyl ether, ethylene glycol dimethyl ether, and dipropylene glycol dimethyl ether.

[0037] The proportion of the organic solvent (A) in all the organic solvents contained in the pretreatment liquid (A) may be 50% by mass or more, 70% by mass or more, 90% by mass or more, or even 100% by mass.

[0038] Examples of surfactants include anionic surfactants, cationic surfactants, amphoteric surfactants, and nonionic surfactants. The surfactant may be either a low molecular weight surfactant or a high molecular weight surfactant. One type of surfactant may be used alone, or two or more types may be used in combination. Of these, nonionic surfactants are preferred. The HLB value of the surfactant is preferably 5 to 20, and more preferably 10 to 18.

[0039] Examples of nonionic surfactants include ester surfactants such as glycerin fatty acid esters and fatty acid sorbitan esters; ether surfactants such as polyoxyethylene alkyl ethers, polyoxyethylene alkylphenyl ethers and polyoxypropylene alkyl ethers; ether ester surfactants such as polyoxyethylene sorbitan fatty acid esters; acetylene surfactants; silicone surfactants; fluorine-based surfactants; etc. Among these, acetylene surfactants are preferably used.

[0040] Examples of the acetylene surfactant include an acetylene glycol surfactant, an acetylene alcohol surfactant, and a surfactant having an acetylene group.

[0041] The acetylene glycol surfactant is a glycol having an acetylene group, preferably a glycol having a symmetrical structure with the acetylene group located in the center, and may have a structure in which ethylene oxide is added to acetylene glycol. Commercially available acetylene surfactants include the Surfynol series manufactured by Evonik Industries (such as "Surfynol 104E," "Surfynol 104H," "Surfynol 420," "Surfynol 440," "Surfynol 465," and "Surfynol 485"), and the Olfin series manufactured by Nissin Chemical Industry Co., Ltd. (such as "Olfin E1004," "Olfin E1010," and "Olfin E1020") (all trade names).

[0042] Examples of silicone surfactants include polyether-modified silicone surfactants, alkyl-aralkyl co-modified silicone surfactants, acrylic silicone surfactants, etc. Commercially available silicone surfactants include "Silface SAG002" and "Silface SAG503A" manufactured by Nissin Chemical Industry Co., Ltd. (both are trade names).

[0043] Other nonionic surfactants include polyoxyethylene alkyl ether surfactants such as the Emulgen series manufactured by Kao Corporation (Emulgen 102KG, Emulgen 103, Emulgen 104P, Emulgen 105, Emulgen 106, Emulgen 108, Emulgen 120, Emulgen 147, Emulgen 150, Emulgen 220, Emulgen 350, Emulgen 404, Emulgen 420, Emulgen 705, Emulgen 707, Emulgen 709, Emulgen 1108, Emulgen 4085, Emulgen 2025G, etc.) (all trade names).

[0044] The content of the surfactant in the pre-treatment liquid (A) may be, for example, 0.05% by mass or more, 0.1% by mass or more, or 0.5% by mass or more, based on the total amount of the pre-treatment liquid (A). Alternatively, it may be 10% by mass or less, 5% by mass or less, or 3% by mass or less. The content of the surfactant in the pre-treatment liquid (A) may be, for example, in the range of 0.05 to 10% by mass.

[0045] In a more preferred embodiment, when the printing ink is an aqueous inkjet ink, the pretreatment liquid (A) preferably contains water. Water generally used in the field of aqueous inks can be used without any particular limitation. Examples include tap water, ion-exchanged water, and deionized water. The water content of the pretreatment liquid (A) is adjusted appropriately depending on the desired performance, viscosity, and the like, but may be, for example, in the range of 1 to 99% by mass.

[0046] The method for producing the pretreatment liquid (A) is not particularly limited, and it can be produced appropriately by a known method. One example is a method in which all components are added at once or in portions to a mixer such as a three-one motor. In a more preferred example of an embodiment, when the printing ink is an aqueous inkjet ink, all components are added at once or in portions to a mixer such as a three-one motor, and the flocculant (A), organic solvent (A), and other optional components are dispersed or dissolved in water. After dispersion or dissolution, a filter such as a membrane filter may be used if desired.

[0047] As described below, the pretreatment liquid (A) can be applied to fabric using an inkjet printer. In this case, the viscosity of the pretreatment liquid (A) at 23°C is preferably 1 to 30 mPa·s.

[0048] The method for applying the pretreatment liquid (A) to the region (1) is not particularly limited, and the pretreatment liquid (A) can be applied by any of various methods commonly used as a printing method for fabrics, such as screen printing, roller printing, and inkjet printing.

[0049] In one embodiment, the pretreatment liquid (A) is preferably applied by inkjet printing, from the viewpoints of improving printing efficiency and facilitating control of the amount applied. The type of inkjet method is not particularly limited, and may be any method such as a piezoelectric method, an electrostatic method, or a thermal method. Application of the pretreatment liquid (A) by the inkjet method can be carried out, for example, by using a general inkjet printer, ejecting droplets of the pretreatment liquid from an inkjet head based on a digital signal, and allowing the ejected droplets to adhere to the fabric.

[0050] The pretreatment liquid (A) is applied to a location where it is desired to maximize the change over time in the printed image. The amount of the pretreatment liquid (A) to be applied per unit area varies depending on the type and concentration of the ink aggregating agent contained in the pretreatment liquid (A), the type and color of the fibers constituting the fabric, and other factors, but is generally 50 to 300 g / m 2 As a specific example, when the fabric is made of cotton, the density may be in the range of 50 to 200 g / m 2 In addition, when the fabric is made of polyester, the weight may be in the range of 80 to 300 g / m 2 may be in the range of

[0051] In one embodiment, the region (2) is at least one region selected from the group consisting of a region (2-1) to which a smaller amount of the pretreatment liquid (A) is applied per unit area than the region (1), a region (2-2) to which a pretreatment liquid (B) having a lower ink coagulation force than the pretreatment liquid (A) is applied, and a region (2-3) to which no pretreatment liquid is applied.

[0052] The amount of pre-treatment liquid (A) applied per unit area in region (2-1) is not particularly limited as long as it is less than that in region (1). For example, it may be 70% or less, 50% or less, or 20% or less of the amount of pre-treatment liquid (A) applied in region (1).

[0053] The method for applying the pretreatment liquid (A) to the region (2-1) is not particularly limited, and it can be applied by any of various methods commonly used as a printing method for fabrics, such as screen printing, roller printing, and inkjet printing.

[0054] In one embodiment, it is preferable to apply the pretreatment liquid (A) by inkjet printing, similar to the region (1), in view of improving printing efficiency and facilitating control of the amount applied.

[0055] In region (2-2), pretreatment liquid (B) is a pretreatment liquid having a lower ink coagulation force than pretreatment liquid (A). The ink coagulation force of the pretreatment liquid can be adjusted, for example, by the type of ink coagulant contained in the pretreatment liquid, the content of the ink coagulant in the pretreatment liquid, etc. As an example, when the ink coagulant contained in pretreatment liquid (A) is a polyvalent metal salt, the ink coagulant contained in pretreatment liquid (B) may be one or more types selected from the group consisting of a monovalent metal salt, a cationic polymer, and an organic acid. Alternatively, pretreatment liquid (B) may not contain an ink coagulant.

[0056] As another example, when the pretreatment liquid (A) and the pretreatment liquid (B) contain the same type of ink aggregating agent, the ink aggregating force of the pretreatment liquid (B) can be made lower than the ink aggregating force of the pretreatment liquid (A) by making the ink aggregating agent content of the pretreatment liquid (B) lower than the ink aggregating agent content of the pretreatment liquid (A). For example, the ink aggregating agent content of the pretreatment liquid (B) may be 70% or less, 50% or less, or 20% or less of the ink aggregating agent content of the pretreatment liquid (A).

[0057] In a more preferred embodiment, when the printing ink is an aqueous inkjet ink, the pretreatment liquid (B) preferably contains water. The water content of the pretreatment liquid (B) is adjusted appropriately depending on the desired performance, viscosity, etc., and may be, for example, in the range of 1 to 99 mass %. The pretreatment liquid (B) may further contain optional components such as an ink coagulant, organic solvent, water, surfactant, pH adjuster, dispersant, fixing agent, preservative, etc. Specific examples of each component include those exemplified as components that may be contained in the pretreatment liquid (A).

[0058] The method for producing the pre-treatment liquid (B) is not particularly limited, and it can be produced, for example, by the same method as that for the pre-treatment liquid (A).

[0059] The method for applying the pretreatment liquid (B) to the region (2-2) is not particularly limited, and it can be applied by any of various methods commonly used as a printing method for fabrics, such as screen printing, roller printing, and inkjet printing.

[0060] In one embodiment, it is preferable to apply the pretreatment liquid (B) by inkjet printing, similar to the region (1), in view of improving printing efficiency and facilitating control of the amount applied.

[0061] When the pretreatment liquid (B) is applied by inkjet printing, the viscosity of the pretreatment liquid (B) at 23°C is preferably 1 to 30 mPa·s.

[0062] The pretreatment liquid (B) is applied to a location where it is desired to minimize changes over time in the printed image compared to the area (1). The amount of pretreatment liquid (B) applied per unit area varies depending on the type and concentration of the ink aggregating agent contained in the pretreatment liquid (B), the type and color of the fibers constituting the fabric, and other factors, but is generally 50 to 300 g / m 2 As a specific example, when the fabric is made of cotton, the density may be in the range of 50 to 200 g / m 2 In addition, when the fabric is made of polyester, the weight may be in the range of 80 to 300 g / m 2 may be in the range of

[0063] The area (2-3) is an area where the pretreatment liquid is not applied, and in the area (2-3), ink for printing an image is applied directly to the fabric.

[0064] As described above, in one embodiment, further regions with different ink coagulation strength may be provided, such as region (3), which is one or more regions selected from the group consisting of region (3-1) where a smaller amount of pretreatment liquid (A) is applied per unit area than region (2-1) and region (3-2) where a pretreatment liquid (C) having lower ink coagulation strength than the pretreatment liquid (B) is applied; and region (4), which is one or more regions selected from the group consisting of region (4-1) where a smaller amount of pretreatment liquid (A) is applied per unit area than region (3-1) and region (4-2) where a pretreatment liquid (D) having lower ink coagulation strength than the pretreatment liquid (C) is applied.

[0065] The amounts of the pretreatment liquid (A) to be applied to the regions (3-1) and (4-1) can be determined based on the same concept as in the region (2-1). As in the region (1), the pretreatment liquid (A) is preferably applied by inkjet printing.

[0066] In addition, for the regions (3-2) and (4-1), the pretreatment liquids (C) and (D) may be pretreatment liquids having different ink coagulation strengths based on the same concept as the pretreatment liquid (B). The pretreatment liquids (C) and (D) are preferably applied by inkjet printing, as in the region (1).

[0067] The order in which each region is formed or the order in which each pretreatment liquid is applied is not particularly limited and may be any order. When multiple types of pretreatment liquids are used, a so-called wet-on-wet method may be used in which the next pretreatment liquid is applied before drying the previously applied pretreatment liquid, or a drying step may be performed after each pretreatment liquid is applied, and then the next pretreatment liquid may be applied. When applying pretreatment liquids using the wet-on-wet method, the amount of volatile matter remaining in the previously applied pretreatment liquid at the time of applying the next pretreatment liquid may be, for example, 50% by mass or more, 75% by mass or more, or 90% by mass or more. The time interval between application of the pretreatment liquids is preferably 0.1 to 200 seconds.

[0068] In one embodiment, ink is applied to a fabric having an area (1) and an area (2). The type of ink is not particularly limited, and any ink may be used. In a more preferred example of one embodiment, the ink may be a water-based ink.

[0069] The method for applying the ink to the fabric is not particularly limited, and the ink can be applied by various methods that are commonly used as a method for printing on fabric, such as screen printing, roller printing, inkjet printing, etc. In one embodiment, it is preferable to apply the pretreatment liquid or ink by inkjet printing, from the viewpoints of improving printing efficiency and facilitating control of the amount applied.

[0070] In one embodiment, it is preferable that the application of the pretreatment liquid and the ink is all performed by an inkjet system, in which case all the application may be performed using one inkjet printer or multiple inkjet printers.

[0071] In a more preferred example of an embodiment, the printing ink may be an aqueous inkjet ink. The composition of the aqueous inkjet ink is not particularly limited, and a wide variety of common inkjet inks can be used. Examples include inks containing a colorant, a resin, a water-soluble organic solvent, a surfactant, water, and other optional components.

[0072] Examples of colorants include pigments, such as organic pigments like azo pigments, phthalocyanine pigments, polycyclic pigments, and dye lake pigments, as well as inorganic pigments like carbon black and metal oxides. Examples of azo pigments include soluble azo lake pigments, insoluble azo pigments, and condensed azo pigments. Examples of phthalocyanine pigments include metal phthalocyanine pigments and metal-free phthalocyanine pigments. Examples of polycyclic pigments include quinacridone pigments, perylene pigments, perinone pigments, isoindoline pigments, isoindolinone pigments, dioxazine pigments, thioindigo pigments, anthraquinone pigments, quinophthalone pigments, metal complex pigments, and diketopyrrolopyrrole (DPP). Examples of carbon black include furnace carbon black, lamp black, acetylene black, and channel black. Examples of metal oxides include titanium oxide and zinc oxide. These pigments may be used alone or in combination.

[0073] The colorant may be a self-dispersing pigment in which hydrophilic functional groups have been introduced onto the surface of the pigment by chemical or physical treatment, or a microencapsulated pigment in which the pigment is coated with a resin. In addition, various pigment dispersants may be used to stably disperse the pigment in the ink.

[0074] Examples of resins include conjugated diene resins such as styrene-butadiene copolymer, methyl methacrylate-butadiene copolymer, and vinyl chloride-vinyl acetate copolymer; acrylic resins such as polymers of acrylic acid esters and methacrylic acid esters, or copolymers of these with styrene or the like; vinyl resins such as ethylene-vinyl acetate copolymer; functional group-modified resins obtained by modifying these various resins with a monomer having a functional group such as a carboxy group; melamine resins; urea resins; polyurethane resins; polyester resins; polyolefin resins; silicone resins; polyvinyl butyral resins; and alkyd resins. The resin may be used as an aqueous dispersion of resin particles.

[0075] Examples of the water-soluble organic solvent, surfactant, and water that can be contained in the pretreatment liquid include those described above.

[0076] The method for producing the ink is not particularly limited, and the ink can be produced by a general ink production method. For example, all components are added together or in portions to a mixer such as a Three-One Motor, dispersed, and, if desired, passed through a filter such as a membrane filter to obtain an ink.

[0077] From the viewpoint of inkjet ejection properties, the viscosity of the ink may be, for example, in the range of 1 to 30 mPa·s at 23°C.

[0078] The ink may be applied by a so-called wet-on-wet method, in which the ink is applied before the pretreatment liquid dries, or by a drying step performed after the application of the pretreatment liquid, followed by the application of the ink. When the ink is applied by the wet-on-wet method, the amount of volatile matter remaining in the pretreatment liquid at the time of application of the ink may be, for example, 50% by mass or more, 75% by mass or more, or 90% by mass or more. The time interval between application of the pretreatment liquid and application of the ink is preferably 0.1 to 200 seconds. Note that when multiple types of pretreatment liquid are applied, the time interval is the time interval from the application of the last applied pretreatment liquid.

[0079] The amount of ink applied may be constant over the entire image forming area, or may be varied as appropriate depending on the image design, the desired degree of change in the printed image over time, etc. For example, if it is desired to make the initial color development uniform between areas (1) and (2), it is preferable to apply more ink to area (1) than to area (2). In addition, the amount of ink applied is adjusted as appropriate depending on the type of ink and fabric, etc., but in any case, it is preferable to apply an amount of ink of 5 to 30 g / m 2 may be in the range of

[0080] After application of the ink, a step of heat-treating the fabric may be carried out. The heat-treatment temperature can be adjusted appropriately depending on the type of fabric, etc., and may be, for example, 100°C or higher, or 150°C or higher. From the viewpoint of reducing thermal damage to the fabric, the heat-treatment temperature is preferably 200°C or lower. The heating method is not particularly limited, and for example, a heat press, a roll heater, a hot air device, an infrared lamp heater, etc. can be used. The heat-treatment time may be set appropriately depending on the heating method and heat-treatment temperature, etc., and may be, for example, in the range of 1 second to 10 minutes.

[0081] After the application of the ink, a step of applying a post-treatment liquid may be carried out. The post-treatment liquid may be applied after the application of the ink and before the heat treatment step, or after the heat treatment step. In the latter case, another heat treatment step may be carried out after the application of the post-treatment liquid.

[0082] In one embodiment, a system for producing printed textiles includes a pretreatment liquid application device that applies a pretreatment liquid to a fabric and an ink application device that applies ink to the fabric. The pretreatment liquid application device forms a region (1) to which a pretreatment liquid (A) containing at least one of an ink coagulant and an organic solvent having a boiling point of 180° C. or higher is applied, and a region (2) that is at least one region selected from the group consisting of a region (2-1) to which a smaller amount of the pretreatment liquid (A) is applied per unit area than in the region (1), a region (2-2) to which a pretreatment liquid (B) having ink coagulation strength lower than that of the pretreatment liquid (A), and a region (2-3) to which no pretreatment liquid is applied. The ink application device applies aqueous ink to the region (1) and the region (2). This production system allows differences in the coagulation strength, permeability into the fabric, fixability, etc. of the ink between the region (1) and the region (2), thereby enabling control of changes over time in printed images. Specifically, region (1) is a region where the change in the printed image over time is relatively large, while region (2) is a region where the change in the printed image over time is relatively small.

[0083] An example of a manufacturing system will be described below with reference to Fig. 1, which is a schematic structural diagram of the manufacturing system. Note that this diagram is merely an example, and the embodiments of the present disclosure are not limited to this example.

[0084] 1, a system 100 for producing a printed textile includes a pretreatment liquid application device 10 that applies a pretreatment liquid to fabric, and an ink application device 20 that applies ink to fabric. When there are multiple types of pretreatment liquids, multiple pretreatment liquid application devices 10 may be provided according to the types of pretreatment liquids to be applied, or one pretreatment liquid application device 10 may have the function of applying multiple types of pretreatment liquids. When there are multiple types of inks, there may be multiple ink application devices 20 according to the types of inks to be applied, or one ink application device 20 may have the function of applying multiple types of inks.

[0085] In a preferred example of an embodiment, both the pretreatment liquid application device 10 and the ink application device 20 may be inkjet heads. In this case, when there are multiple types of pretreatment liquids, separate inkjet heads may be used to apply each pretreatment liquid, or one inkjet head may have the function of applying multiple types of pretreatment liquids. Specifically, the pretreatment liquid application device 10 may have ejection nozzles for multiple types of pretreatment liquids. Similarly, when there are multiple types of inks, separate inkjet heads may be used to apply each ink, or one inkjet head may have the function of applying multiple types of inks. Specifically, the ink application device 20 may have ejection nozzles for multiple types of inks. Furthermore, one inkjet head may have the function of applying multiple types of pretreatment liquids and inks; that is, the pretreatment liquid application device 10 and the ink application device 20 may be integrated into one inkjet head.

[0086] When the pretreatment liquid application device 10 and the ink application device 20 are both inkjet heads, the pretreatment liquid application device 10 and the ink application device 20 may be present in a single printer, or may be present in separate printers.

[0087] The manufacturing system 100 may further include a control device 30. The control device 30 is a device that controls the types and amounts of the pretreatment liquid and ink to be applied in order to form a desired print image.

[0088] The manufacturing system 100 may further include a heating device 40. The heating device 40 is a device for heating the fabric after the pretreatment liquid is applied by the pretreatment liquid application device 10, after the ink is applied by the ink application device 20, etc.

[0089] Some embodiments of the present disclosure are set forth below.

[0090] <1> A method for producing a printed textile, comprising applying ink to a fabric having: a region (1) to which a pretreatment liquid (A) containing at least one of an ink aggregating agent and an organic solvent having a boiling point of 180°C or higher has been applied; and a region (2) which is at least one region selected from the group consisting of a region (2-1) to which a smaller amount of the pretreatment liquid (A) has been applied per unit area than in the region (1), a region (2-2) to which a pretreatment liquid (B) having lower ink aggregating power than the pretreatment liquid (A) has been applied, and a region (2-3) to which no pretreatment liquid has been applied.

[0091] <2> the pretreatment liquid (A) contains the ink aggregating agent and the organic solvent having a boiling point of 180° C. or higher; <1> A method for producing the printed textile described above.

[0092] <3> The pretreatment liquid (A), the pretreatment liquid (B), and the ink are applied by an inkjet method. <1> or <2> A method for producing the printed textile described above.

[0093] <4> 1. A system for producing printed textiles, comprising: a pretreatment liquid application device that applies a pretreatment liquid to a fabric; and an ink application device that applies ink to the fabric, wherein the pretreatment liquid application device forms a region (1) to which a pretreatment liquid (A) containing at least one of an ink coagulant and an organic solvent having a boiling point of 180°C or higher is applied; and a region (2) that is at least one region selected from the group consisting of a region (2-1) to which a smaller amount of the pretreatment liquid (A) is applied per unit area than in the region (1), a region (2-2) to which a pretreatment liquid (B) having lower ink coagulation force than the pretreatment liquid (A) is applied, and a region (2-3) to which no pretreatment liquid is applied, and the ink application device applies aqueous ink to the region (1) and the region (2). [Example]

[0094] Hereinafter, embodiments of the present disclosure will be described in detail using examples. The present disclosure is not limited to the following examples. In the following description, "%" means "% by mass" unless otherwise specified. The content shown in each table indicates the total amount of raw materials blended as a solution, dispersion, etc.

[0095] [Preparation of pretreatment liquid] The raw materials were mixed in the blending ratios shown in Table 1 and filtered through a cellulose acetate membrane filter with a pore size of 3 μm to obtain pretreatment solutions 1 to 4.

[0096] [Ink manufacturing] The raw materials were mixed in the blending ratios shown in Table 2 and filtered through a cellulose acetate membrane filter with a pore size of 3 μm to obtain a cyan ink.

[0097] Details of the raw materials listed in Tables 1 and 2 are as follows:

[0098] Calcium chloride: ink flocculant, manufactured by Fujifilm Wako Pure Chemical Industries, Ltd. Propylene glycol: Water-soluble organic solvent with a boiling point of 189°C, manufactured by Fujifilm Wako Pure Chemical Industries, Ltd. Dipropylene glycol dimethyl ether: Water-soluble organic solvent with a boiling point of 171°C, manufactured by Fujifilm Wako Pure Chemical Industries, Ltd. Glycerin: Water-soluble organic solvent with a boiling point of 290°C, manufactured by Kao Corporation Diethylene glycol: Water-soluble organic solvent with a boiling point of 245.8°C, manufactured by Fujifilm Wako Pure Chemical Industries, Ltd. Surfactant: Nissin Chemical Industry Co., Ltd.'s "Olfine E1010", an acetylene-based surfactant Pigment dispersion: Cabot "CAB-O-JET 450C", cyan pigment dispersion, solid content 15% by mass Resin emulsion: "Superflex 470" manufactured by Daiichi Kogyo Seiyaku Co., Ltd., aqueous dispersion of polyurethane resin particles, resin content 38% by mass, anionic

[0099] [Table 1]

[0100] [Table 2]

[0101] [Examples 1 to 5 and Comparative Example 1] Using the pretreatment liquid and ink obtained above, printed textiles were produced according to the following procedure. The changes over time in the printed images of the obtained printed textiles were evaluated by measuring the cyan optical density (hereinafter sometimes referred to as the "ODc value").

[0102] [Print image] In this example, an image was used in which a Gothic A was drawn with a line width of approximately 8 mm within a 5 cm x 5 cm area. Hereinafter, the part of the area where the letter A is located will be referred to as area 1, and the part other than the letter A will be referred to as area 2. An image diagram is shown in Figure 2.

[0103] [Measurement of ODc value] The ODc value of the printed image surface was measured using an "eXact" manufactured by X-Rite. Measurements were taken on printed items that had been left to stand at room temperature for 24 hours after printing. Measurements were taken at 10 points, and the average of the measured values ​​was used for evaluation.

[0104] [Example 1] The fabric used was a white cotton material. The ODc value of the fabric was 0.08. Pretreatment liquid 1 was applied to area 1 at an amount of 100 g / m. 2 After inkjet printing, the ink was applied to area 1 using the wet-on-wet method at a rate of 22 g / m 2 The amount of 18g / m given to area 2 2 Inkjet printing was performed using a heat press. Region 2 is the region to which the pretreatment liquid was not applied. The print was then dried at 180°C for 1 minute using a heat press, yielding a printed item. The ODc value of Region 1 was 1.15, and the ODc value of Region 2 was 1.15. After the print was washed five times, the ODc value of Region 1 was 0.08, indicating a significant change in the printed image over time. On the other hand, the ODc value of Region 2 was 1.13, indicating almost no change in the printed image over time.

[0105] [Example 2] The fabric used was a white cotton material. The ODc value of the fabric was 0.08. Pretreatment liquid 1 was applied to area 1 at an amount of 100 g / m. 2 After inkjet printing, the ink was applied to both areas 1 and 2 using the wet-on-wet method at a rate of 20 g / m 2 Inkjet printing was performed using a heat press. Region 2 is the region to which no pretreatment liquid was applied. The print was then dried at 180°C for 1 minute using a heat press to obtain a printed item. The ODc value of Region 1 was 1.07, and the ODc value of Region 2 was 1.15. After the print was washed five times, the ODc value of Region 1 was 0.09, indicating a significant change in the printed image over time. On the other hand, the ODc value of Region 2 was 1.13, indicating almost no change in the printed image over time.

[0106] [Example 3] The fabric used was a white cotton material. The ODc value of the fabric was 0.08. Pretreatment liquid 2 was applied to area 1 at an amount of 100 g / m. 2 After spray printing, the ink was applied to both areas 1 and 2 using the wet-on-wet method at a rate of 20 g / m 2Inkjet printing was performed using a pretreatment liquid. Region 2 is a region to which no pretreatment liquid was applied. The product was then dried at 180°C for 1 minute using a heat press to obtain a printed fabric. The ODc value of Region 1 was 0.95, and the ODc value of Region 2 was 1.16. Color bleeding was observed at the boundary between Region 1 and Region 2. After washing the printed fabric five times, the ODc value of Region 1 was 0.34, and the printed image showed change over time, but the degree of change was smaller than in Examples 1 and 2, which used Pretreatment Liquid 1. On the other hand, the ODc value of Region 2 was 1.14, and the printed image showed almost no change over time.

[0107] [Example 4] The fabric used was a white cotton fabric. The ODc value of the fabric was 0.08. Pretreatment liquid 3 was applied to area 1 at an amount of 100 g / m. 2 After spray printing, the ink was applied to both areas 1 and 2 using the wet-on-wet method at a rate of 20 g / m 2 Inkjet printing was performed using a pretreatment liquid. Region 2 is an area to which no pretreatment liquid was applied. The fabric was then dried at 180°C for 1 minute using a heat press, yielding a printed fabric. The ODc value of Region 1 was 1.02, and the ODc value of Region 2 was 1.15. After the printed fabric was washed five times, the ODc value of Region 1 was 0.25, indicating some change in the printed image over time, but the degree of change was smaller than in Examples 1 and 2, which used Pretreatment Liquid 1. On the other hand, the ODc value of Region 2 was 1.08, indicating almost no change in the printed image over time.

[0108] [Example 5] The fabric used was a white polyester fabric. The ODc value of the fabric was 0.12. Pretreatment liquid 1 was applied to region 1 at a rate of 100 g / m 2 And the amount of application to area 2 is 10 g / m 2 After inkjet printing, the ink was applied to both areas 1 and 2 using the wet-on-wet method at a rate of 20 g / m 2The print was then dried at 180°C for 1 minute using a heat press, yielding a printed item. The ODc value of region 1 was 1.05, and the ODc value of region 2 was 1.18. After the print was washed five times, the ODc value of region 1 was 0.10, indicating significant change in the printed image over time. On the other hand, the ODc value of region 2 was 1.16, indicating almost no change in the printed image over time.

[0109] [Comparative Example 1] The fabric used was a white cotton fabric. The ODc value of the fabric was 0.08. Pretreatment liquid 4 was applied to area 1 at an amount of 100 g / m. 2 After spray printing, the ink was applied to both areas 1 and 2 using the wet-on-wet method at a rate of 20 g / m 2 The print was then dried at 180°C for 1 minute using a heat press, yielding a printed item. The ODc value of region 1 was 0.98, and the ODc value of region 2 was 1.17. After the print was washed five times, the ODc value of region 1 was 0.96, and the ODc value of region 2 was 1.15, with almost no change in the printed image over time in either region. [Explanation of symbols]

[0110] 10 Pretreatment liquid application device, 20 Ink application device, 30 Control device, 40 Heating device, 100 System

Claims

1. a region (1) to which a pretreatment liquid (A) containing at least one of an ink aggregating agent and an organic solvent having a boiling point of 180° C. or higher has been applied; a fabric having at least one region (2) selected from the group consisting of a region (2-1) to which a smaller amount of the pretreatment liquid (A) per unit area is applied than the region (1), a region (2-2) to which a pretreatment liquid (B) having a lower ink coagulation force than the pretreatment liquid (A) is applied, and a region (2-3) to which no pretreatment liquid is applied, A method for producing a printed item, comprising applying ink.

2. The method for producing a printed item according to claim 1 , wherein the pretreatment liquid (A) contains the ink aggregating agent and the organic solvent having a boiling point of 180° C. or higher.

3. The method for producing a printed item according to claim 1 , wherein the pretreatment liquid (A), the pretreatment liquid (B), and the ink are applied by an inkjet system.

4. The method includes a pretreatment liquid application device that applies a pretreatment liquid to a fabric, and an ink application device that applies an ink to the fabric, the pretreatment liquid application device, a region (1) to which a pretreatment liquid (A) containing at least one of an ink aggregating agent and an organic solvent having a boiling point of 180° C. or higher is applied; a region (2-1) to which the amount of the pretreatment liquid (A) applied per unit area is smaller than that of the region (1), a region (2-2) to which a pretreatment liquid (B) having a lower ink coagulation force than the pretreatment liquid (A) is applied, and a region (2-3) to which no pretreatment liquid is applied, the ink applying device applies a water-based ink to the area (1) and the area (2); A manufacturing system for textile printing.

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