Inkjet treatment liquid, and ink set and printing method using same

Abstract

One aspect of the present disclosure relates to a processing liquid for inkjet printing, the processing liquid containing a cationic polymer and succinic acid, and having a halogen ion concentration of 5g / L or less and a pH of 7 to 9.5.

Description

[Technical field]

[0001] The present disclosure relates to an inkjet treatment liquid, and further to an ink set and a textile printing method using the same. [Background technology]

[0002] In the inkjet recording method, it is known to apply a pretreatment liquid prior to application of ink. For example, a method has been reported in which a treatment liquid containing fine particles as a component that forms aggregates with the coloring material in the ink is used.

[0003] Patent Document 1 discloses an inkjet recording method in which a colorless liquid containing silica fine particles is applied to a recording material, and then a non-aqueous recording liquid containing oil black is applied to the material. Patent Document 2 discloses the use of a solution containing fine particles or fine particles and a binder polymer as a treatment liquid.

[0004] Since the liquid containing such fine particles contains reactive fine particles in a dispersed state, a large amount of reactive components can be added. However, the liquid composition containing the reactive fine particles contains corrosive ions in a high concentration in the liquid composition due to the fact that corrosive ions such as chloride ions and acids are added as secondary ions in order to ensure the dispersion stability of the components reactive with the coloring material. Therefore, when the liquid composition is used as it is as a raw material for the treatment liquid, in many cases, the corrosive ions cause problems in contact with the liquid, and there is a risk of dissolving the metal-based material of the head that ejects the treatment liquid.

[0005] In response to the problem of wettability caused by corrosive ions, it has been reported that wettability can be improved by specifying the chloride ion concentration in a treatment liquid containing a cationic polymer to 3000 ppm or less (Patent Document 3).In addition, a method for producing a treatment liquid containing one or more components reactive with a coloring material has been reported, which is characterized in that corrosive ions (halogen ions) are replaced with less corrosive ions by an ion exchange method during the production process (Patent Document 4). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 4-259590 [Patent Document 2] Japanese Patent Application Publication No. 6-92010 [Patent Document 3] Japanese Patent Application Publication No. 10-237372 [Patent Document 4] JP 2004-90456 A Summary of the Invention

[0007] The inkjet treatment liquid according to one aspect of the present disclosure contains a cationic polymer and succinic acid, has a halogen ion concentration of 5 g / L or less, and has a pH of 7 to 9.5. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 shows an example of inkjet recording performed using the inkjet treatment liquid of this embodiment. [Diagram 2] FIG. 2 is a perspective view showing the overall configuration of a recording apparatus according to an embodiment of the present disclosure. [Diagram 3] FIG. 3 is a schematic cross-sectional view taken along line III-III in FIG. [Figure 4] FIG. 4 is an enlarged perspective view of the carriage shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] According to the description of Patent Document 3 as mentioned above, cationic polymers, cationic surfactants, etc. are used as cationic substances constituting the liquid composition, but they contain some chlorine ions such as chloride radicals resulting from acid treatments, etc. carried out during the synthesis and purification of these substances (paragraph 0008). Therefore, if the chlorine concentration is set to 3000 ppm or less, it is not possible to increase the amount of cationic polymer, which is a reactive component with the coloring material, added, and it is considered that the aggregation effect with the coloring material will not be sufficiently obtained.

[0010] In addition, it has been found that when halogen ions are removed by ion exchange, as in the technology described in Patent Document 4, the cationic polymer becomes unstable to heat, causing a problem in that the area where the treatment liquid is applied turns yellow when heated.

[0011] On the other hand, the above-mentioned Patent Documents 1 to 4 are all inkjet treatment liquids for printing on paper media such as plain paper, and are not intended to be used for textile printing on fabrics, etc. In the case of inkjet recording used for textile printing, a treatment liquid containing a binder resin is usually used as a pretreatment. This binder resin penetrates into the gaps between fibers and binds the fibers together, which causes problems specific to textile printing, such as making the fabric stiff and impairing the texture, such as the feel to the touch.

[0012] Hereinafter, embodiments of the present disclosure will be described in detail, but the present invention is not limited thereto.

[0013] [Inkjet treatment liquid] The inkjet treatment liquid according to one embodiment of the present disclosure (hereinafter, sometimes simply referred to as the "treatment liquid") contains a cationic polymer and succinic acid, has a halogen ion concentration of 5 g / L or less, and has a pH of 7 to 9.5.

[0014] The treatment liquid of this embodiment is a pretreatment liquid that is applied to a recording target prior to application of ink. The cationic polymer contained in this treatment liquid reacts with and aggregates with the pigment contained in the ink that is applied thereafter, thereby ensuring excellent color development.

[0015] That is, the inkjet treatment liquid of the present disclosure can suppress the corrosion of the inkjet head members and the yellowing of the recording medium in inkjet recording, and can obtain excellent color development (image density). Furthermore, when the inkjet treatment liquid of the present disclosure is used in textile printing, there is an advantage that the texture of the fabric is improved.

[0016] In the treatment liquid of the present embodiment, the halogen ion concentration is low, so that the corrosion of the inkjet head member caused by the halogen ion can be suppressed. In addition, by containing succinic acid and having a pH in the above range, the yellowing of the cationic polymer having a low halogen concentration can be reduced. In other words, in the present embodiment, the yellowing of the treatment liquid can be suppressed. Furthermore, since the yellowing of the recording medium can be suppressed, for example, when the treatment liquid of the present embodiment is used for textile printing, the yellowing of the fabric to be printed can be suppressed.

[0017] In addition, the treatment liquid of the present embodiment contains succinic acid, but succinate has a higher solubility in aqueous solvents (water and organic solvents soluble in water) than lactate and the like. In order to enhance the effect of the treatment liquid described above, it is preferable to increase the amount of the cationic polymer blended, but lactate and the like may not be blended in a sufficient amount from the viewpoint of solubility. In this regard, since succinate has a high solubility, a sufficient amount of cationic polymer can be blended, making it possible to obtain excellent color development and texture of the fabric while suppressing yellowing.

[0018] That is, the inkjet treatment liquid of the present embodiment can suppress corrosion of the inkjet head members and yellowing of the recording medium in inkjet recording, and can provide excellent color development (image density). Furthermore, when the inkjet treatment liquid of the present embodiment is used for textile printing, there is an advantage that the texture of the fabric is improved.

[0019] The cationic polymer contained in the inkjet treatment liquid of the present embodiment is not particularly limited as long as it is a cationic polymer that is positively charged, and examples thereof include cationic polymers such as ammonium-containing polymers, amine-containing polymers, polyallylamine, polyvinylamine, polyimine, polyvinylpyrrolidone, polyethyleneimine, polyvinylpyridine, aminoacetalized polyvinyl alcohol, ionene polymers, polyvinylimidazole, polyvinylbenzylphosphonium, polyalkylallylammonium, polyamidine, and polyamine sulfone. Among these, from the viewpoint of obtaining better color development, particularly preferred examples include quaternary ammonium-containing polymers, diallyldimethylammonium sulfur dioxide copolymers, diallyldimethylammonium chloride acrylamide copolymers, diallyldimethylammonium chloride polymers, dimethylamine-ammonia-epichlorohydrin polycondensates, and dimethylamine-ammonia-epichlorohydrin polycondensates. These may be used alone or in combination of two or more.

[0020] The weight average molecular weight of the cationic polymer used in the present embodiment is not particularly limited, but is preferably about 1000 to 10000. If the molecular weight is within this range, it is considered that the ejection properties from an inkjet head will be better.

[0021] The content of the cationic polymer is preferably 0.3% by weight or more and 35% by weight or less with respect to the entire treatment liquid. It is considered that the content of the cationic polymer in the above range can further increase color development (image density) and can further suppress yellowing of the recording medium. The lower limit of the content of the cationic polymer is more preferably 0.5% by weight or more, and even more preferably 1% by weight or more. The upper limit is more preferably 29.5% by weight or less, and even more preferably 20% by weight or less.

[0022] The treatment liquid of this embodiment further contains succinic acid, which may be contained in the form of succinate ions.

[0023] The content of succinic acid is preferably 20% by weight or less based on the total amount of the treatment liquid. By setting the content of succinic acid within the above range, it is considered that the color development (image density) is further improved and yellowing of the recording medium can be further suppressed. The upper limit of the content of succinic acid is more preferably 18% by weight or less, and further preferably 15% by weight or less.

[0024] The lower limit of the succinic acid content is not particularly limited, but from the viewpoint of obtaining the effect of stabilizing the cationic polymer, it is preferably 0.5% by weight or more, and more preferably 1% by weight or more.

[0025] In the treatment liquid of this embodiment, the weight ratio of the cationic polymer to the succinic acid (cationic polymer / succinic acid) is preferably 0.20 or more and 3.50 or less. This has the advantage of stabilizing the cationic polymer. The weight ratio is more preferably in the range of 0.25 or more and 3.00 or less.

[0026] In the treatment liquid of this embodiment, the remainder other than the above-mentioned components is usually water or an aqueous solvent consisting of water and an organic solvent.

[0027] Examples of organic solvents that the treatment liquid can contain include glycols, alcohols, aliphatic hydrocarbons, aromatic hydrocarbons, ketones, esters, ethers, vegetable oils, etc. Examples of water-soluble organic solvents include polyhydric alcohols, ether compounds of polyhydric alcohols, nitrogen-containing compounds, alcohol compounds, sulfur-containing compounds, propylene carbonate, and ethylene carbonate.

[0028] Examples of polyhydric alcohols include a first diol compound having 5 to 8 carbon atoms, a second diol compound having 2 to 4 carbon atoms, 1,2,6-hexanetriol, glycerin, trimethylolpropane, sugar alcohols (e.g., xylitol), and sugars (e.g., xylose, glucose, and galactose).

[0029] Examples of the first diol compound include 2-methylpentane-2,4-diol, triethylene glycol, tetraethylene glycol, 1,5-pentanediol, and 1,2-hexanediol.

[0030] Examples of the second diol compound include ethylene glycol, 1,2-propanediol, 1,3-propanediol, butylene glycol, and diethylene glycol.

[0031] Examples of the ether compounds of polyhydric alcohols include ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, propylene glycol monobutyl ether, dipropylene glycol monobutyl ether, and ethylene oxide adducts of diglycerin.

[0032] Examples of the nitrogen-containing compound include pyrrolidone, N-methyl-2-pyrrolidone, cyclohexylpyrrolidone, and triethanolamine.

[0033] Examples of the alcohol compound include ethanol, isopropyl alcohol, butyl alcohol, and benzyl alcohol.

[0034] Sulfur-containing compounds include, for example, thiodiethanol, thiodiglycerol, sulfolane, and dimethyl sulfoxide.

[0035] Among the above-mentioned organic solvents, it is preferable to use glycols such as propylene glycol, etc. These can be used alone or in combination of two or more kinds.

[0036] When the treatment liquid contains an organic solvent, the content of the organic solvent is preferably 3% by weight or more and 50% by weight or less based on the total weight of the treatment liquid. By containing the organic solvent in the above range, it is possible to provide a treatment liquid with a viscosity that allows stable ejection, and there are also advantages in that the drying of the treatment liquid can be reduced.

[0037] Furthermore, the treatment liquid of this embodiment may contain a surfactant for the purpose of adjusting the surface tension to an appropriate level. There are no particular limitations on the surfactant that can be used, and examples include nonionic surfactants, cationic surfactants, and anionic surfactants.

[0038] When the treatment liquid contains a surfactant, the content of the surfactant is preferably 0.1% by weight or more and 5% by weight or less based on the total weight of the treatment liquid. By containing the surfactant in the above range, it is possible to provide a treatment liquid with a surface tension that allows stable discharge.

[0039] The treatment liquid of this embodiment may contain other additives as long as they do not impair the effect of this embodiment. Examples of additives include a dissolution stabilizer, a drying inhibitor, an antioxidant, a viscosity adjuster, a pH adjuster, and an anti-mold agent.

[0040] In the treatment liquid of this embodiment, as described above, the halogen ion concentration is 5 g / L or less, and the pH is 7 to 9.5. The halogen ion concentration can be adjusted by obtaining a cationic polymer having an adjusted halogen ion concentration using an ion exchange resin, as described later.

[0041] The pH of the treatment solution can be adjusted, for example, by adjusting the amount of succinic acid added.

[0042] The halogen ion concentration of the treatment liquid is more preferably 3 g / L or less, and the pH range of the treatment liquid is more preferably 7 to 9.

[0043] [Method of manufacturing the processing solution] Although there is no particular limitation on the method for producing the treatment liquid of this embodiment, an example will be described below. First, a column is filled with a basic ion exchange resin, and a cationic polymer is passed through the column to obtain a regulated cationic polymer having a reduced halogen ion concentration.

[0044] The treatment liquid of this embodiment can be obtained by mixing the obtained adjusted cationic polymer, succinic acid, an aqueous solvent, and components added as necessary (for example, a surfactant, etc.).

[0045] [Inkjet recording method using processing liquid] Next, a method of using the treatment liquid of this embodiment will be described. The treatment liquid of this embodiment can be used as a pretreatment liquid in an inkjet recording apparatus 10 as shown in FIG.

[0046] Specifically, the inkjet recording device 10 shown in FIG. 1 has a processing head 1 and a recording head 2, and the recording head 2 may include a first recording head 2a, a second recording head 2b, a third recording head 2c, and a fourth recording head 2d.

[0047] The processing head 1 ejects a processing liquid onto at least an image formation area of ​​the recording target P for pre-processing before image formation. The processing liquid used here is the processing liquid described above. The processing head 1 is not particularly limited, but examples thereof include a piezoelectric type head and a thermal inkjet type head. The inkjet textile printing device 10 of this embodiment may further include one or more processing liquid tanks (not shown) that contain the processing liquid, and in this case, the processing liquid is supplied from the processing liquid tank to the processing head 2.

[0048] The recording head 2 ejects ink onto an image forming area of ​​the recording target P. The first recording head 2a, the second recording head 2b, the third recording head 2c, and the fourth recording head 2d of the recording head 2 eject ink of different colors (for example, yellow ink, magenta ink, cyan ink, and black ink). The number of recording heads is not limited to four, and the number of recording heads may be one to three, or five or more. The recording head 2 is not particularly limited, but examples thereof include a piezoelectric type head and a thermal inkjet type head.

[0049] A recording object P is placed on the mounting table 3. A processing head 1 and a recording head 2 are disposed above the mounting table 3 so that processing liquid and ink can be ejected onto the recording object P. Driven by a motor (not shown), the mounting table 3 moves horizontally in a direction from the processing head 1 toward the recording head 2 (e.g., to the left in FIG. 1). As the mounting table 3 moves horizontally, the recording object P on the mounting table 3 is transported.

[0050] In this embodiment, the recording target P is not particularly limited and may be a medium such as plain paper, but the treatment liquid of this embodiment can exert an even greater effect when used for textile printing purposes. Therefore, it is preferable that the recording target P is a medium that can be used for textile printing.

[0051] In forming an inkjet record, first, the mounting table 3 on which the record object P is placed moves horizontally, and the record object P is transported to a position facing the processing head 1. The processing head 1 ejects a treatment liquid onto the record object P. The processing head 1 may eject the treatment liquid only onto the image formation area of ​​the record object P, may eject the treatment liquid onto an area larger than the image formation area of ​​the record object P, or may eject the treatment liquid onto the entire surface of the record object P. In order to reduce the amount of treatment liquid used and suppress deterioration in the tactile feel of the printed material, it is preferable that the processing head 1 eject the treatment liquid only onto the image formation area of ​​the record object P.

[0052] After the processing liquid is ejected from the processing head 1, the mounting table 3 on which the recording object P is placed further moves horizontally, and the recording object P is transported to a position facing the recording head 2. Then, ink is ejected from the recording head 2 onto an image formation area of ​​the recording object P. In this way, an image is formed with ink in the image formation area of ​​the recording object P.

[0053] Although not shown, after the ink is discharged by the recording head 2, the mounting table 3 on which the recording object P is placed may be further moved horizontally, and a post-treatment liquid may be discharged from another treatment head. The post-treatment liquid is a non-coloring treatment liquid that does not develop color even when it adheres to the recording object P, and exhibits a function of increasing the fixability and fastness (resistance to rubbing and scraping) of the ink image printed on the recording object P by the recording head 2. A silicone-based treatment liquid or the like may be used as such a post-treatment liquid. In this way, a treatment film is formed by the post-treatment liquid on the image formed in the image formation area of ​​the recording object P.

[0054] After the post-treatment liquid is ejected, the mounting table 3 on which the recording object P is placed further moves horizontally, and the recording object P is transported to a position facing a heating unit (not shown), where the heating unit heats the recording object P to dry the ink and treatment liquid. The heating temperature is, for example, 120° C. or higher and 180° C. or lower. The heating time is, for example, 1 minute or higher and 10 minutes or lower. The heating dries the volatile components contained in the ink and treatment liquid, accelerating the fixation of the ink and treatment liquid to the recording object P. As a result, an image is formed by the ink, and the recording object P is formed which has been treated by the treatment liquid.

[0055] The treatment liquid of the present embodiment is not limited to use in the inkjet recording device 10, and can be modified, for example, as shown in the following modified examples. For example, the inkjet recording device 10 may be provided with a sprayer for spraying the treatment liquid, instead of the treatment head 1 for ejecting the treatment liquid. Alternatively, the treatment with the treatment liquid may be performed by immersing the recording object P in a tank in which the treatment liquid is stored. In addition, in the inkjet recording device 10, the mounting table 3 moves horizontally, but the processing head 1 and the recording head 2 may move horizontally while the mounting table 3 is fixed. Alternatively, the mounting table 3 may move horizontally in the transport direction of the recording object P, or the processing head 1 and the recording head 2 may move horizontally, and the processing head 1 and the recording head 2 may move horizontally in a direction perpendicular to the transport direction of the recording object P.

[0056] In other words, as long as the treatment head 1 and the recording head 2 are provided, the effects of using the treatment liquid of this embodiment can be obtained regardless of the type of inkjet recording device.

[0057] [ink] The ink used in inkjet recording together with the treatment liquid of the present embodiment is not particularly limited, but for example, an ink containing a pigment and an aqueous medium can be used. The ink may further contain at least one selected from the group consisting of a surfactant, a polyol, and binder resin particles, as necessary.

[0058] The pigment may be, for example, a dispersible pigment that is dispersed in an aqueous medium. From the viewpoint of obtaining an ink having excellent image density, hue, and color stability, the volume median diameter (D 50 In this specification, the volume median diameter (D 50 ) is a median diameter measured using a laser diffraction / scattering particle size distribution measuring device (LA-950, manufactured by Horiba, Ltd.).

[0059] Examples of pigments include yellow pigments, orange pigments, red pigments, blue pigments, purple pigments, and black pigments. Examples of yellow pigments include CI Pigment Yellow (74, 93, 95, 109, 110, 120, 128, 138, 139, 151, 154, 155, 173, 180, 185, and 193). Examples of orange pigments include CI Pigment Orange (34, 36, 43, 61, 63, and 71). Examples of red pigments include CI Pigment Red (122 and 202). Examples of blue pigments include CI Pigment Blue (15, more specifically 15:3). Examples of purple pigments include CI Pigment Violet (19, 23, and 33). Examples of black pigments include CI Pigment Black (7).

[0060] The pigment content is preferably 1% by weight or more and 12% by weight or less, more preferably 1% by weight or more and 7% by weight or less, based on the total weight of the ink. By making the pigment content 1% by weight or more, the image density of the recorded matter formed can be improved. Also, by making the pigment content 12% by weight or less, an ink with high fluidity can be obtained.

[0061] In particular, the ink of this embodiment preferably contains an anionic pigment. This causes the cationic polymer contained in the treatment liquid and the anionic pigment to react and aggregate electrically on the surface of the recording medium, thereby preventing the binder resin (binder resin described below) contained in the ink from penetrating into the recording medium. This reduces the binder resin penetrating into gaps between fibers and bonding the fibers together when the recording medium is fabric. This improves the texture (feel, etc.) of the fabric to be printed.

[0062] More preferred anionic pigments are those having an anionic group such as a carboxyl group, a sulfonic acid group, a phosphoric acid group, a phosphonic acid group, a phenylsulfonic acid group, or a phenylcarboxyl group.

[0063] The aqueous medium contained in the ink of this embodiment is a medium containing water as a main component. The aqueous medium may function as a solvent or as a dispersion medium. Specific examples of the aqueous medium include water and a mixture of water and a polar solvent. Examples of polar solvents contained in the aqueous medium include methanol, ethanol, isopropyl alcohol, butanol, and methyl ethyl ketone. The content of water in the aqueous medium is preferably 90% by weight or more, and particularly preferably 100% by weight. The content of the aqueous medium is preferably 5% by weight or more and 70% by weight or less, and more preferably 40% by weight or more and 60% by weight or less, based on the weight of the entire ink.

[0064] Furthermore, the ink contains a surfactant, which improves the wettability of the ink to the recording target. Examples of surfactants include anionic surfactants, cationic surfactants, nonionic surfactants, and amphoteric surfactants. The surfactant contained in the ink is preferably a nonionic surfactant. The nonionic surfactant is preferably a surfactant having an acetylene glycol structure, and more preferably an acetylene diol ethylene oxide adduct. The HLB value of the surfactant is preferably 3 to 20, more preferably 6 to 16, and even more preferably 7 to 10. The HLB value of the surfactant is calculated, for example, by the Griffin method using the formula "HLB value = 20 x (sum of formula weights of hydrophilic parts) / molecular weight". In order to improve image density while suppressing image offset, the content of the surfactant is preferably 0.1 to 5.0% by weight, and more preferably 0.5 to 2.0% by weight, based on the weight of the entire ink.

[0065] Furthermore, the ink contains a polyol, so that the viscosity of the ink can be suitably adjusted. The polyol contained in the ink is preferably a diol or a triol. Examples of diols include glycol compounds, more specifically, ethylene glycol, propylene glycol, diethylene glycol, triethylene glycol, and tetraethylene glycol. Examples of triols include glycerin.

[0066] When the ink contains a polyol, in order to suitably adjust the viscosity of the ink, the polyol content is preferably 5 to 60% by weight, and more preferably 20 to 50% by weight, of the total weight of the ink.

[0067] The binder resin particles contained in the ink of this embodiment are present in a dispersed state in an aqueous medium. The binder resin particles function as a binder that bonds the subject to be printed and the pigment. Therefore, by including the binder resin particles in the ink, a printed item with excellent pigment fixation can be obtained.

[0068] Examples of the resin contained in the binder resin particles include urethane resin, (meth)acrylic resin, styrene-(meth)acrylic resin, styrene-maleic acid copolymer, vinylnaphthalene-(meth)acrylic acid copolymer, and vinylnaphthalene-maleic acid copolymer. The resin contained in the binder resin particles is preferably urethane resin. The content of the urethane resin in the binder resin particles is preferably 80% by weight or more, more preferably 100% by weight.

[0069] The content of the binder resin is preferably 1% by weight or more and 20% by weight or less, more preferably 2% by weight or more and 10% by weight or less, based on the weight of the entire ink. When the content of the binder resin particles is 1% by weight or more, a recording subject with excellent pigment fixation can be obtained. On the other hand, when the content of the binder resin particles is 20% by weight or less, the ink can be stably discharged onto the recording subject.

[0070] Furthermore, the ink of this embodiment may further contain known additives (more specifically, a dissolution stabilizer, a drying inhibitor, an antioxidant, a viscosity adjuster, a pH adjuster, an anti-mold agent, etc.) as necessary.

[0071] The ink used in this embodiment is produced by, for example, mixing the pigment, the aqueous medium, and components added as necessary (for example, surfactant, polyol, and binder resin particles) using a mixer. The mixing time is, for example, from 1 minute to 30 minutes.

[0072] [Ink set] This embodiment also includes an ink set that includes the inkjet treatment liquid and an inkjet ink described above.

[0073] The inkjet ink is preferably an ink containing an anionic pigment, and more preferably an ink containing an anionic pigment and a binder resin.

[0074] In particular, when the ink set of the present embodiment is used for textile printing, it exhibits an excellent effect of enhancing the texture of the textile to be printed, and therefore is preferably an ink set for textile printing.

[0075] [Printing method] The present embodiment also includes a textile printing method using the inkjet treatment liquid and the inkjet ink described above.

[0076] When using pigment inks that can be used to print on many types of fabric, the pigment must be fixed to the surface of the fabric. If the pigment cannot be fixed to the surface of the fabric, the abrasion resistance will be poor. On the other hand, if the pigment and binder resin do not remain on the surface of the fabric but penetrate deep into it, not only will the color develop poorly, but the ink and binder resin will get between the fibers, making the fabric feel hard, which means the texture will deteriorate.

[0077] According to the textile printing method of the present embodiment, the above-mentioned problems can be improved by using the above-mentioned treatment liquid.

[0078] The specific method is substantially the same as the recording method described above in "Inkjet recording method using a treatment liquid", except that the recording object is changed to a printing object. The printing object includes all kinds of fabrics, specifically, it may be woven fabric, knitted fabric, or nonwoven fabric. Examples of the fabrics include cotton fabric, silk fabric, linen fabric, acetate fabric, rayon fabric, nylon fabric, polyurethane fabric, and polyester fabric.

[0079] As the inkjet ink for textile printing, among the above-mentioned inks, it is preferable to use an ink containing an anionic pigment, and more preferably to use an ink containing an anionic pigment and a binder resin.

[0080] According to the textile printing method of the present embodiment, it is possible to obtain excellent color development while suppressing corrosion of the inkjet head components and yellowing of the subject to be printed, and further, it is possible to suppress deterioration of the texture of the fabric to be printed, making it extremely useful for industrial use.

[0081] In this embodiment, the treatment liquid does not require the time and effort of padding and drying the fabric in advance, and by applying it to the fabric using an inkjet system, there is also the advantage that the time and effort required for adjusting the fabric can be significantly reduced.

[0082] [Recording device] Further, the recording device 10 shown in Fig. 1 will be described in detail. In the following, as a specific example of the recording device, an inkjet printer equipped with an ink head that ejects ink for forming an image on a wide and long recording medium will be exemplified. Inkjet printers are suitable for digital textile printing that uses an inkjet method to print images such as characters and patterns on a recording medium made of fabric such as woven fabric or knitted fabric. Of course, the recording device according to the present disclosure can also be used for printing various images on recording media such as paper sheets and resin sheets.

[0083] Overall configuration of inkjet printer FIG. 2 is a perspective view showing the overall configuration of an inkjet printer 100 according to a first embodiment of the present disclosure, and FIG. 3 is a schematic cross-sectional view taken along line III-III in FIG. 2. The inkjet printer 100 is a printer that prints images on a wide and long workpiece W (recording medium) by an inkjet method. As an example, the width of the workpiece W is several meters. The printer 100 includes an apparatus frame 11, and a work transport section 20 and a carriage 300 that are incorporated into the apparatus frame 11. Note that in this embodiment, the left-right direction is the main scanning direction S (FIG. 4) when printing on the workpiece W, and the direction from the rear to the front is the sub-scanning direction (the transport direction F of the workpiece W that intersects with the main scanning direction S).

[0084] The device frame 11 forms a framework for mounting various components of the inkjet printer 100. The work transport unit 20 is a mechanism that intermittently feeds (transports) the work W so that the work W progresses in a transport direction F from rear to front in a printing area where inkjet printing processing is performed. The carriage 300 is equipped with an ink head 4, a pre-treatment liquid head 5, a post-treatment liquid head 6, and a sub-tank 7, and moves back and forth in a main scanning direction S (left-right direction) that intersects with the transport direction F of the work W during the inkjet printing processing.

[0085] The device frame 11 includes a central frame 111, a right frame 112, and a left frame 113. The central frame 111 forms a framework for mounting various components of the inkjet printer 100, and has a left-right width corresponding to the work transport section 20. The right frame 112 and the left frame 113 are erected to the right and left of the central frame 111, respectively. Between the right frame 112 and the left frame 113 is the printing area 12 where printing processing is performed on the work W.

[0086] The right frame 112 forms a maintenance area 13. The maintenance area 13 is an area where the carriage 300 is retracted when the printing process is not being performed. In the maintenance area 13, cleaning processes, purging processes, and the like are performed on the nozzles (ejection holes) of the ink head 4, the pre-treatment liquid head 5, and the post-treatment liquid head 6, and the nozzles are also capped. The left frame 113 forms a turn-back area 14 for the carriage 300. The turn-back area 14 is an area where the carriage 300 temporarily enters when it performs a main scan in the opposite direction after performing a main scan in the opposite direction from right to left in the printing process.

[0087] A carriage guide 15 for reciprocating the carriage 300 in the left-right direction is attached to the upper side of the device frame 11. The carriage guide 15 is a flat plate-shaped member that is long in the left-right direction, and is disposed above the work transport section 20. A timing belt 16 is attached to the carriage guide 15 so as to be capable of circulating in the left-right direction (main scanning direction). The timing belt 16 is an endless belt, and is driven to circulate leftward or rightward.

[0088] A pair of upper and lower guide rails 17 that hold the carriage 300 in a state that allows it to move back and forth in the main scanning direction S are provided on the carriage guide 15 so as to extend parallel to the left and right direction. The carriage 300 engages with the guide rails 17. The carriage 300 is also fixed to the timing belt 16. As the timing belt 16 moves orbitally leftward or rightward, the carriage 300 moves leftward or rightward along the carriage guide 15 while being guided by the guide rails 17.

[0089] Referring mainly to FIG. 3, the work transport section 20 includes a feed roller 21 that pays out the work W before printing, and a take-up roller 22 that takes up the work W after printing. The feed roller 21 is disposed at the rear lower part of the device frame 11, and is a take-up shaft for the feed roll WA, which is a wound body of the work W before printing. The take-up roller 22 is disposed at the front lower part of the device frame 11, and is a take-up shaft for the take-up roll WB, which is a wound body of the work W after the printing process. A first motor M1 is attached to the take-up roller 22, which drives the take-up roller 22 to rotate about its axis and executes the operation of winding up the work W.

[0090] The path between the delivery roller 21 and the take-up roller 22 and passing through the printing area 12 is the transport path for the work W. On this transport path, a first tension roller 23, a work guide 24, a transport roller 25 and a pinch roller 26, a turn-back roller 27, and a second tension roller 28 are arranged in this order from the upstream side. The first tension roller 23 applies a predetermined tension to the work W on the upstream side of the transport roller 25. The work guide 24 changes the transport direction of the work W from the upward direction to the forward direction, and allows the work W to enter the printing area 12.

[0091] The transport roller 25 is a roller that generates a transport force that intermittently feeds the workpiece W in the printing area 12. The transport roller 25 is driven to rotate about its axis by the second motor M2, and intermittently transports the workpiece W forward (in a predetermined transport direction F) so that the workpiece W passes through the printing area 12 (image forming position) facing the carriage 300. The pinch roller 26 is disposed so as to face the transport roller 25 from above, and forms a transport nip portion together with the transport roller 25.

[0092] The turn-back roller 27 changes the transport direction of the work W that has passed through the printing area 12 from the forward direction to the downward direction, and guides the work W after the printing process to the take-up roller 22. The second tension roller 28 applies a predetermined tension to the work W downstream of the transport roller 25. A platen 29 is disposed below the transport path of the work W in the printing area 12.

[0093] The carriage 300, supported at one end by the guide rail 17, moves back and forth in a main scanning direction S (left and right in this embodiment) that intersects (orthogonal in this embodiment) with the transport direction F. The carriage 300 includes a carriage frame 30, and an ink head 4, a pre-treatment liquid head 5, a post-treatment liquid head 6, and a sub-tank 7 (FIG. 4) that are mounted on the carriage frame 30. The carriage frame 30 includes a head support frame 31 and a back frame 32.

[0094] The head support frame 31 is a horizontal plate that holds the heads 4 to 6 described above. The back frame 32 is a vertical plate that extends upward from the rear end edge of the head support frame 31. As described above, the timing belt 16 is fixed to the back frame 32. Also, the guide rail 17 is engaged with the back frame 32. That is, in this embodiment, the back frame 32 is an engagement portion that is held in a cantilevered state by the guide rail 17. The head support frame 31 is a horizontal plate whose rear end side is supported in a cantilevered state by the guide rail 17 by the engagement portion.

[0095] The cantilevered state refers to a state in which the engagement portion (back frame 32), which is a portion of the carriage 300 that is held by the guide rail 17, which is a holding member, is present only on one side, either upstream or downstream, from the center of the carriage 300 in the transport direction F, and no other engagement portion is present on the opposite side to the side where the engagement portion is present. The engagement portion may also be located outside the range in which the ink head 4 and the processing head are located in the transport direction F. In other words, the engagement portion may be located only upstream or only downstream of the range in which the ink head 4 and the processing head are located in the transport direction F.

[0096] Carriage details Further description will be given of the carriage 300. Fig. 4 is an enlarged perspective view of the carriage 300 shown in Fig. 2. Fig. 4 shows a transport direction F (sub-scanning direction) of the workpiece W and a main scanning direction S which is a moving direction of the carriage 300. Fig. 4 shows an example in which the carriage 300 is equipped with a plurality of ink heads 4 which eject ink for forming an image onto the workpiece W, a pre-treatment liquid head 5 and a post-treatment liquid head 6 which eject a non-color-forming treatment liquid, and a plurality of sub-tanks 7 which supply the ink and the treatment liquid to these heads 4 to 6.

[0097] Each of the ink heads 4 has a number of nozzles (ink ejection holes) that eject ink droplets by an ejection method such as a piezoelectric method using a piezoelectric element or a thermal method using a heating element, and ink passages that guide ink to the nozzles. For example, the inks described above can be used as the ink. The ink heads 4 in this embodiment are capable of ejecting eight colors of ink. The ink heads 4 are mounted on the head support frame 31 of the carriage 300 so as to be aligned in two rows in the main scanning direction S. Each color ink head 4 has two heads.

[0098] Specifically, the ink heads 4 have a first upstream ink head 41A and a first downstream ink head 41B. These ink heads 4 eject yellow ink. The ink heads 4 also have a second upstream ink head 42A and a second downstream ink head 42B. These ink heads 4 eject magenta ink. Similarly, as shown in FIG. 4, two ink heads 4 ejecting the same color ink are disposed at positions shifted from each other in the transport direction F and the main scanning direction S. These two ink heads 4 form a set, and a total of eight sets of ink heads 4 (41A to 48A, 41B to 48B) eject inks of different colors.

[0099] The pre-treatment liquid head 5 and the post-treatment liquid head 6 are disposed at positions different from the ink head 4 in the transport direction F. The pre-treatment liquid head 5 is disposed upstream of the ink head 4 in the transport direction F. FIG. 4 shows an example in which one pre-treatment liquid head 5 is disposed near the left end of the array of ink heads 4. Similarly, the post-treatment liquid head 6 is disposed downstream of the ink head 4 in the transport direction F. FIG. 4 shows an example in which one post-treatment liquid head 6 is disposed at the right end of the array of ink heads 4. In other embodiments, a plurality of pre-treatment liquid heads 5 or a plurality of post-treatment liquid heads 6 may be disposed. It is desirable that the carriage 300 is provided with at least one pre-treatment liquid head 5 and at least one post-treatment liquid head 6, but in other embodiments, the pre-treatment liquid head 5 and the post-treatment liquid head 6 may not be disposed.

[0100] A series of heads arranged along the main scanning direction S, which are made up of the ink heads 4, the pretreatment liquid heads 5, and the posttreatment liquid heads 6, is referred to as a row of heads, or simply as a row. A series of heads arranged along the transport direction F, which are made up of the ink heads 4, the pretreatment liquid heads 5, and the posttreatment liquid heads 6, is referred to as a row of heads, or simply as a row.

[0101] The pretreatment liquid head 5 ejects a pretreatment liquid for performing a predetermined pretreatment on the workpiece W. The pretreatment liquid is ejected from the ink head 4 to a position on the workpiece W where ink has not yet been ejected from the ink head 4. The treatment liquid of this embodiment is used as the pretreatment liquid. This makes it possible to suppress yellowing of the treatment liquid or components of the treatment liquid. Furthermore, since yellowing of the recording medium can be suppressed, for example, when the device of this embodiment is used for textile printing, yellowing of the fabric to be printed can be suppressed.

[0102] The post-treatment liquid head 6 ejects a post-treatment liquid for performing a predetermined post-treatment on the workpiece W to which the ink is attached. The post-treatment liquid is ejected from the post-treatment liquid head 6 to a position on the workpiece W after the ink is ejected from the ink head 4. The post-treatment liquid is a non-coloring treatment liquid that does not develop color even when it adheres to the workpiece W, and is a treatment liquid that exhibits a function of increasing the fixability and fastness (resistance to rubbing and scraping) of the ink image printed on the workpiece W by the ink head 4. As such a post-treatment liquid, a silicone-based treatment liquid or the like can be used. Note that the post-treatment liquid and the pre-treatment liquid are different treatment liquids. Specifically, the components contained in the post-treatment liquid and the pre-treatment liquid are different.

[0103] Here, the non-coloring treatment liquid refers to a treatment liquid that is not recognized as colored by the naked eye when printed alone on a recording medium. The color here includes colors with a saturation of 0, such as black, white, and gray. The non-coloring treatment liquid is basically a transparent liquid, but when, for example, 1 liter of treatment liquid is viewed in liquid form, it is not completely transparent and may appear slightly white. Such a color is very light, so when printed alone on a recording medium, it is not recognized as colored by the naked eye. Note that, depending on the type of treatment liquid, when printed alone on a recording medium, a change such as glossiness may occur on the recording medium, but such a state is not colored.

[0104] In this embodiment, the pre-treatment liquid and the post-treatment liquid may be ejected onto substantially the entire surface of the workpiece W, or the pre-treatment liquid and the post-treatment liquid may be ejected selectively in accordance with the image to be printed, similar to ink.

[0105] Next, a case where the pretreatment liquid and the posttreatment liquid are selectively ejected will be described. As described above, the pretreatment liquid, the ink, and the posttreatment liquid are ejected in this order onto the workpiece W in the portion where the color is printed according to the image. In this case, the ink may be of one color or of multiple colors. Basically, the pretreatment liquid and the posttreatment liquid are not ejected onto the portion where the color is not printed, that is, the portion where the ink is not ejected. Note that, in order to adjust the image quality of the printed image and the texture of the workpiece W, the selection of the ejection of the pretreatment liquid and the posttreatment liquid may be made to differ from the ejection of the ink.

[0106] 4, openings 31H are provided at positions where the heads are arranged on the head support frame 31. The ink head 4, the pre-treatment liquid head 5, and the post-treatment liquid head 6 are attached to the head support frame 31 so as to be fitted into the respective openings 31H. Nozzles arranged on the lower end surface of each of the heads 4, 5, and 6 are exposed from each opening 31H.

[0107] The multiple sub-tanks 7 are supported by the carriage 300 above the heads 4, 5, and 6 via a holding frame (not shown). The multiple sub-tanks 7 are provided corresponding to each of the heads 4, 5, and 6. Ink or treatment liquid is supplied to each sub-tank 7 from a main tank 90 (described below) that contains ink and treatment liquid, and these are supplied to each of the heads 4, 5, and 6. Each sub-tank 7 and the heads 4, 5, and 6 are connected by pipelines (not shown in FIG. 4).

[0108] Specifically, the multiple sub-tanks 7 include a first supply sub-tank 71A to an eighth supply sub-tank 78A, a pre-treatment supply sub-tank 7FA, and a post-treatment supply sub-tank 7RA, which are arranged on the rear side along the main scanning direction S. Furthermore, the multiple sub-tanks 7 include a first recovery sub-tank 71B to an eighth recovery sub-tank 78B, a pre-treatment recovery sub-tank 7FB, and a post-treatment recovery sub-tank 7RB, which are arranged on the front side along the main scanning direction S.

[0109] The first supply sub-tank 71A and the first recovery sub-tank 71B located on the leftmost side of the carriage 300 store yellow ink containing a pigment. The first supply sub-tank 71A supplies yellow ink to the first upstream ink head 41A and the first downstream ink head 41B (both of which are also referred to as supply destinations). On the other hand, the first recovery sub-tank 71B stores the yellow ink recovered from the first upstream ink head 41A and the first downstream ink head 41B. As described above, a part of the yellow ink is ejected from the first upstream ink head 41A and the first downstream ink head 41B toward the workpiece W. Similarly, the second supply sub-tank 72A supplies magenta ink to the second upstream ink head 42A and the second downstream ink head 42B. On the other hand, the second recovery sub-tank 72B stores the magenta ink recovered from the second upstream ink head 42A and the second downstream ink head 42B. Each of the other sub-tanks, from the third sub-tank to the eighth sub-tank, has the same structure and function as the above.

[0110] The pre-treatment supply sub-tank 7FA supplies the pre-treatment liquid to the pre-treatment liquid head 5, and the pre-treatment recovery sub-tank 7FB recovers the pre-treatment liquid from the pre-treatment liquid head 5. The post-treatment supply sub-tank 7RA supplies the post-treatment liquid to the post-treatment liquid head 6, and the post-treatment recovery sub-tank 7RB recovers the post-treatment liquid from the post-treatment liquid head 6.

[0111] As described above, the inkjet printer 100 according to this embodiment is an all-in-one printer in which three types of heads, the ink head 4, the pretreatment liquid head 5, and the posttreatment liquid head 6, are mounted on a single carriage 300. With this inkjet printer 100, for example, in the printing process of performing inkjet printing on fabric in digital textile printing, the process of ejecting the pretreatment liquid and the process of ejecting the posttreatment liquid can be executed integrally. This makes it possible to simplify the textile printing process and make the textile printing device more compact.

[0112] The inkjet printer 100 according to this embodiment uses a serial printing method to perform printing on the workpiece W. Specifically, if the workpiece W is wide, it is not possible to print on the workpiece W while continuously feeding it. The serial printing method is a printing method in which a carriage 300 carrying ink heads 4 of each color moves back and forth in the main scanning direction S, and the workpiece W is intermittently fed in the transport direction F, repeatedly.

[0113] Specifically, the belt-shaped image is printed while the carriage 300 moves in the forward direction, which is one of the main scanning directions S. During this main scanning in the forward direction, the feeding of the workpiece W is stopped. After the belt-shaped image is printed, the workpiece W is sent out in the transport direction F by a predetermined pitch. At this time, the carriage 300 waits in the turn-back area 14 on the left end side. After the workpiece W is sent out, the carriage 300 turns back in the return direction opposite to the forward direction in accordance with the reverse movement of the timing belt 16. The workpiece W is in a stopped state. Then, while moving in the return direction, the carriage 300 prints the next belt-shaped image on the upstream side of the belt-shaped image. Thereafter, the same operation is repeated. EXAMPLES

[0114] The present disclosure will be described in more detail below with reference to examples, but the present disclosure is not limited to these examples in any way.

[0115] Example 1 Preparation of cationic polymers The column was packed with 0.5 L of strong basic ion exchange resin (OH type), and 1 L of "PAS-A5" (manufactured by Nittobo Medical Co., Ltd.) was passed through at a flow rate of 50 ml / min to obtain adjusted cationic polymer solution 1. PAS-A5 is a cationic polymer of quaternary ammonium salt (diallyldimethylammonium chloride-sulfur dioxide copolymer). The solid content of the obtained adjusted cationic polymer solution 1 was 40%.

[0116] Preparation of processing solution The adjusted cationic polymer solution 1 obtained above: 3 parts by weight (solid content), succinic acid: 2 parts by weight, nonionic surfactant "Surfynol 440" (manufactured by Nissin Chemical Industry Co., Ltd.): 1 part by weight, propylene glycol: 10 parts by weight, and the remainder: water were mixed, and then filtered through a 5 μm filter to obtain treatment solution 1 (pH 8.0, chloride ion concentration 4.5 g / L).

[0117] Example 2 A treatment liquid 2 was obtained in the same manner as in Example 1, except that the amount of the prepared cationic polymer liquid 1 in Example 1 was changed from 3 parts by weight to 0.5 parts by weight (pH 7.9, chloride ion concentration 1.0 g / L).

[0118] Example 3 Treatment solution 3 was obtained in the same manner as in Example 1, except that the amount of succinic acid in Example 1 was changed from 2 parts by weight to 1 part by weight (pH 7.9, chloride ion concentration 3.5 g / L).

[0119] Example 4 Preparation of cationic polymers The adjusted cationic polymer liquid 1 obtained in Example 1 was passed through the column again at a flow rate of 50 ml / min to obtain adjusted cationic polymer liquid 2. The solid content of the obtained adjusted cationic polymer liquid 2 was 40%.

[0120] Preparation of processing solution Treatment solution 8 was obtained in the same manner as in Example 1, except that 30 parts by weight (solid content) of the adjusted cationic polymer solution 2 obtained above was used instead of the adjusted cationic polymer solution 1, and the amount of succinic acid was changed to 18 parts by weight (pH 8.9, chloride ion concentration 4.5 g / L).

[0121] Comparative Example 1 "PAS-A5" (manufactured by Nittobo Medical Co., Ltd.): 3 parts by weight (solid content), 1% 1N sodium hydroxide, 1 part by weight of nonionic surfactant "Surfynol 440" (manufactured by Nissin Chemical Industry Co., Ltd.), 10 parts by weight of propylene glycol, and the remainder: water were mixed and then filtered through a 5 μm filter to obtain treatment solution 8 (pH 7.3, chloride ion concentration 5.6 g / L).

[0122] Comparative Example 2 The adjusted cationic polymer solution 1: 3 parts by weight (solid content), lactic acid: 0.5 parts by weight, nonionic surfactant "Surfynol 440" (manufactured by Nissin Chemical Industry Co., Ltd.): 1 part by weight, propylene glycol: 10 parts by weight, and the remainder: water were mixed and then filtered through a 5 μm filter to obtain treated solution 9 (pH 10.0, chloride ion concentration 4.6 g / L).

[0123] Comparative Example 3 The adjusted cationic polymer solution 1: 3 parts by weight (solid content), nonionic surfactant "Surfynol 440" (manufactured by Nissin Chemical Industry Co., Ltd.): 1 part by weight, propylene glycol: 10 parts by weight, and the remainder: water were mixed, and then filtered through a 5 μm filter to obtain treated solution 10 (pH 10.9, chloride ion concentration 4.6 g / L).

[0124] Comparative Example 5 The adjusted cationic polymer solution 1: 3 parts by weight (solid content), acetic acid: 0.8 parts by weight, nonionic surfactant "Surfynol 440" (manufactured by Nissin Chemical Industry Co., Ltd.): 1 part by weight, propylene glycol: 10 parts by weight, and the remainder: water were mixed, and then filtered through a 5 μm filter to obtain treated solution 11. (pH 8.4, chloride ion concentration 4.6 g / L).

[0125] Comparative Example 6 The adjusted cationic polymer solution 1: 3 parts by weight (solid content), succinic acid: 0.5 parts by weight, nonionic surfactant "Surfynol 440" (manufactured by Nissin Chemical Industry Co., Ltd.): 1 part by weight, propylene glycol: 10 parts by weight, and the remainder: water were mixed, and then filtered through a 5 μm filter to obtain treated solution 9 (pH 10.2, chloride ion concentration 4.6 g / L).

[0126] (Ink Preparation) The ink was prepared using anionic pigment dispersion “AE-2078F” (manufactured by Sanyo Pigment Co., Ltd.) with a pigment concentration of 20%, urethane dispersion “Superflex 470” (manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) with a solid content of 38%, nonionic surfactant “Surfynol 440” (manufactured by Nissin Chemical Industry Co., Ltd.), propylene glycol, and water.

[0127] The specific ink composition was 4% by weight of pigment, 8% by weight of urethane, 30% by weight of propylene glycol, 1% by weight of surfactant, and the remainder was water. After mixing in the above ratio, the mixture was filtered through a 5 μm filter to obtain the ink.

[0128] (Preparation of post-treatment solution) A post-treatment liquid was prepared using a silicone oil emulsion "POLON-MF-51" (manufactured by Shin-Etsu Chemical Co., Ltd.) with a silicone oil content of 39%, propylene glycol, and water. The specific composition was silicone oil: 10% by weight, propylene glycol: 30% by weight, and the remainder: water. After mixing in the above ratio, the mixture was filtered through a 5 μm filter to obtain a post-treatment liquid.

[0129] <Print> For the inkjet printing, a flatbed printing jig with Kyocera KJ4B heads arranged in the transport direction was used. The first head was charged with pretreatment liquid, the second head with ink, and the third head with posttreatment liquid, and inkjet printing was performed under the following conditions. Note that only in Comparative Example 4 was printing performed without pretreatment liquid. Fabric used: Polyester tropical Fabric / head distance: 3mm, head temperature: 25℃ Drying: 150℃ 3 minutes (oven)

[0130] <Evaluation test> (Image Density) The color was measured using a fluorescence spectrophotometer FD-5 (manufactured by Konica Minolta, Inc.) The evaluation criteria were as follows. Image density (OD) 1.3 or more "Excellent" Very good color development Image density (OD) 1.25 or more and less than 1.3 "Good" - Good color development Image density (OD) less than 1.25 "Poor" Poor color development

[0131] (Yellowing of fabric) The density of the fabric itself and the density (yellow) of the area where the pretreatment liquid was applied were measured using a fluorescence spectrophotometer FD-5 (Konica Minolta), and the difference between the two was taken as ΔOD. The evaluation criteria were as follows: ΔOD: Less than 0.05 "Excellent" - No visible yellowing, very good ΔOD: 0.05 or more and less than 0.10 "Good": slight yellowing and good ΔOD: 0.10 or more "Poor" yellowing

[0132] (Texture) An unused printing object was folded in half along the warp (in the length direction), and the distance (loop height) between the lower fabric and the upper fabric at the fold was measured. The measured loop height of the unused printing object was taken as the loop height before printing. Next, the area where the solid image of the evaluation printing object was formed was folded in half along the warp (in the length direction), and the loop height was measured. The measured loop height of the evaluation printing object was taken as the loop height after printing. The change rate of the loop height before and after printing (unit: %) was calculated according to the formula "change rate of loop height = 100 x loop height after printing / loop height before printing". The lower the change rate of the loop height, the less the printing object becomes hard or bulges after printing, and therefore the more the deterioration of the tactile feel of the printed object is suppressed. The evaluation criteria were as follows. Less than 130% "Good": Little change in texture, good 130% or more "Poor": Texture becomes hard and poor

[0133] (Corrosion of metal components) Approximately 0.1g of SUS430 piece was weighed out and immersed in 50g of treatment solution weighed out in a 50ml glass bottle, the bottle was closed, and the bottle was left at 60℃ for one month. After one month, the SUS430 piece was taken out, washed with ion-exchanged water, dried, and weighed. The weight change rate was calculated using the following formula. Weight after standing / Weight before standing x 100 = Weight change rate (%) The evaluation criteria were as follows: Weight change rate (%): 98-100% "Good": No corrosion and very little weight change Weight change rate (%): Less than 98% "Poor": Corrosion has progressed and weight loss is large

[0134] The results of the above evaluation tests are summarized in Table 1.

[0135] [Table 1]

[0136] (Consideration) From the results in Table 1, it was confirmed that the treatment liquid of the present disclosure can suppress corrosion of metal members. In addition, it was shown that when printing is performed using the treatment liquid of the present disclosure, a printed matter having excellent color development (image density), suppressing yellowing of the fabric, and excellent texture can be obtained. In particular, from a comparison between Examples 1 to 3 and Example 4, it was found that yellowing of the fabric can be further suppressed by reducing the amount of cationic polymer.

[0137] On the other hand, in Comparative Example 1, which used a treatment liquid that did not contain succinic acid and had a halogen ion (chloride ion) concentration of more than 5 g / L, corrosion of metal members occurred. In Comparative Examples 2, 3, and 6, which used treatment liquids with a pH of more than 9, yellowing of the fabric occurred. In Comparative Example 4, which did not use a pretreatment liquid, the image density decreased and the texture was poor. Furthermore, yellowing occurred in Comparative Example 5, which used a treatment liquid containing acetic acid instead of succinic acid. Thus, although the Comparative Examples were inferior in relative evaluation to the Examples, this does not mean that the implementation content of the Comparative Examples themselves is excluded or abandoned. [Explanation of symbols]

[0138] 1 Processing head 2 Recording head 2a First recording head 2b Second recording head 2c 3rd recording head 2d 4th recording head 3. Placement table 10 Inkjet recording device P Recording target

Claims

1. The inkjet treatment liquid contains a cationic polymer and succinic acid, has a halogen ion concentration of 5 g / L or less, and has a pH of 7 to 9.

5.

2. The inkjet treatment liquid according to claim 1 , wherein the cationic polymer comprises a quaternary ammonium-containing cationic polymer.

3. 2. The inkjet treatment liquid according to claim 1, wherein the content of the cationic polymer is from 0.3% by weight to 35% by weight based on the total weight of the treatment liquid.

4. 2. The inkjet treatment liquid according to claim 1, wherein the content of the succinic acid is 0.5% by weight or more and 20% by weight or less based on the total weight of the treatment liquid.

5. The inkjet treatment liquid according to claim 1 , wherein a weight ratio of the cationic polymer to the succinic acid (cationic polymer / succinic acid) is 0.20 or more and 3.50 or less.

6. The inkjet treatment liquid according to any one of claims 1 to 5, which is for textile printing.

7. The inkjet treatment liquid according to claim 6, which is for textile printing using an inkjet ink containing an anionic pigment.

8. The inkjet treatment liquid according to any one of claims 1 to 5, and an inkjet ink containing an anionic pigment.

9. 6. A textile printing method comprising: applying the inkjet treatment liquid according to claim 1 to an object to be printed; and then applying an inkjet ink containing an anionic pigment to an area where the inkjet treatment liquid has been applied.

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