Inkjet processing solution, ink set using the same, method for manufacturing printed materials, and inkjet recording method.

Abstract

SOLUTION: To provide a treatment liquid for inkjet printing, the treatment liquid containing a cationic polymer and succinic acid, and having a halogen ion concentration of equal to or less than 5 g / L and a pH of 7 to 9.5.EFFECT: A treatment liquid for inkjet printing of the present disclosure can suppress the corrosion of an inkjet head member and yellowing of a recording medium in inkjet recording, and excellent color developability (image density) can be obtained. When used in textile printing, the treatment liquid for inkjet printing of the present disclosure further provides an advantage of improving the texture of the fabric.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a processing liquid for inkjet. Furthermore, it relates to an inkjet and a printing method using the same.

Background Art

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

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

[0004] Since such a liquid containing 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 above reactive fine particles inevitably contains corrosive ions in the component manufacturing process, and corrosive ions such as chloride ions and acids are added as secondary ions to ensure the dispersion stability of components having reactivity with the coloring material. For this reason, when the liquid composition is used as it is as a raw material for the processing liquid, in many cases, problems on the liquid contact due to the corrosive ions occur, and there is a risk of melting the metal-based material of the head that discharges the processing liquid.

[0005] Regarding the problem of wettability due to these corrosive ions, there is a report that the wettability is improved by stipulating that the chlorine ion concentration in the treatment liquid containing a cationic polymer be 3000 ppm or less (Patent Document 3). Further, when manufacturing a treatment liquid containing one or more components having reactivity with a coloring material, a method for manufacturing a treatment liquid is reported, which is characterized by replacing corrosive ions (halogen ions) with ions having lower corrosivity by an ion exchange method of replacing ions by an ion exchange method during the manufacturing process (Patent Document 4).

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Summary of the Invention

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

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Best Mode for Carrying Out the Invention

[0009] According to the description of Patent Document 3 as described above, as the cationic substance constituting the liquid composition, a cationic polymer, a cationic surfactant, etc. are used, but they contain chlorine ions such as chloride ions to some extent due to acid treatment, etc. performed during their synthesis and purification (paragraph 0008). Therefore, when the chlorine concentration is 3000 ppm or less, the addition amount of the cationic polymer, which is a reaction component with the coloring material, cannot be increased, and it is considered that the aggregation effect with the coloring material cannot be sufficiently obtained.

[0010] Also, as in the technique described in Patent Document 4, when halogen ions are removed by an ion exchange method, the cationic polymer becomes thermally unstable, and it has been found that there is a problem that the portion where the treatment liquid is applied turns yellow due to heating.

[0011] On the other hand, all of Patent Documents 1 to 4 described above are inkjet treatment liquids for printing on paper media such as plain paper, and are not assumed to be used for printing on cloth or the like. In the case of inkjet recording used for printing, usually, a treatment liquid containing a binder resin is used as a pretreatment. Since this binder resin penetrates into the gaps between the fibers and binds the fibers together, there is also a problem peculiar to printing, such as the fabric becoming stiff and the texture such as the feel being impaired.

[0012] Hereinafter, embodiments according to the present disclosure will be specifically described, but the present invention is not limited thereto.

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

[0014] The treatment liquid of this embodiment is a pretreatment liquid that is applied to the recording target prior to ink application. The cationic polymer contained in this treatment liquid can react and aggregate with the pigment contained in the ink to be applied later, ensuring excellent color development.

[0015] That is, according to the treatment liquid for inkjet use of the present disclosure, in inkjet recording, corrosion of the inkjet head member and yellowing of the recording medium can be suppressed, and excellent color development (image density) can be obtained. Furthermore, when the inkjet treatment liquid of the present disclosure is used for printing, there is an advantage that the texture of the fabric also becomes good.

[0016] In the treatment liquid of this embodiment, since the halogen ion concentration is low, corrosion of the inkjet head member by halogen ions can be suppressed. Also, by containing succinic acid and having the pH within the above range, yellowing of the cationic polymer with a low halogen concentration can be reduced. That is, in this embodiment, yellowing of the treatment liquid can be suppressed. Furthermore, since yellowing of the recording medium can be suppressed, for example, when the treatment liquid of this embodiment is used for printing, yellowing of the fabric to be printed can be suppressed.

[0017] Also, the treatment liquid of this embodiment contains succinic acid, but the succinate has a higher solubility in an aqueous solvent (water and an organic solvent dissolved in water) compared to lactate or the like. In order to enhance the effects of the treatment liquid described above, it is preferable to increase the blending amount of the cationic polymer, but in the case of lactate or the like, there is a possibility that a sufficient amount cannot be blended from the viewpoint of solubility. In this regard, since the succinate has high solubility, a sufficient amount of the cationic polymer can be blended, so it is possible to obtain excellent color development and fabric texture while suppressing yellowing.

[0018] That is, according to the treatment liquid for inkjet use of this embodiment, in inkjet recording, corrosion of the inkjet head member and yellowing of the recording medium can be suppressed, and excellent color development (image density) can be obtained. Furthermore, when the inkjet treatment liquid of this embodiment is used for printing, there is an advantage that the texture of the fabric also becomes good.

[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. For example, ammonium-containing polymers, amine-containing polymers, polyallylamine, polyvinylamine, polyimine, polyvinylpyrrolidone, polyethyleneimine, polyvinylpyridine, aminoacetalized polyvinyl alcohol, ionene polymers, polyvinylimidazole, polyvinylbenzylphosphonium, polyalkylallylammonium, polyamidine, polyaminesulfone and other cationic polymers can be mentioned. Among these, from the viewpoint of obtaining better color development properties, quaternary ammonium-containing polymers, diallyldimethylammonium sulfur dioxide copolymers, diallyldimethylammonium chloride acrylamide copolymers, diallyldimethylammonium chloride polymers, dimethylamine·ammonia·epichlorohydrin polycondensates, dimethylamine·ammonia·epichlorohydrin polycondensates and the like are particularly preferably exemplified. These can 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 property from the 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 based on the total amount of the treatment liquid. When the content of the cationic polymer is within the above range, it is considered that the color development property (image density) will be further enhanced and the yellowing of the recording medium can be further suppressed. A more preferable lower limit value of the content of the cationic polymer is 0.5% by weight or more, and further 1% by weight or more. Also, a more preferable upper limit value is 29.5% by weight or less, and further 20% by weight or less.

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

[0023] The content of the succinic acid is preferably 20% by weight or less based on the entire treatment liquid. When the content of the succinic acid is within the above range, it is considered that the color developability (image density) is further enhanced and the yellowing of the recording medium can be further suppressed. A more preferable upper limit value of the content of the succinic acid is 18% by weight or less, and still more preferably 15% by weight or less.

[0024] Also, the lower limit value 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. Thereby, there is an advantage of stabilizing the cationic polymer. A more preferable range of the weight ratio is 0.25 or more and 3.00 or less.

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

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

[0028] Examples of the polyhydric alcohol 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 alcohol (e.g., xylitol), and saccharides (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 compound of the polyhydric alcohol 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 an ethylene oxide adduct 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] Examples of the sulfur - containing compound include 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.

[0036] When the treatment liquid contains an organic solvent, its content is preferably 3% by weight or more and 50% by weight or less based on the whole treatment liquid. By containing the organic solvent within the above range, a treatment liquid with a viscosity enabling stable ejection can be provided, and there are advantages such as reducing the drying of the treatment liquid.

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

[0038] When the treatment liquid contains a surfactant, its content is preferably 0.1% by weight or more and 5% by weight or less based on the whole treatment liquid. By containing the surfactant within the above range, there is an advantage such that a treatment liquid with a surface tension enabling stable ejection can be provided.

[0039] The treatment liquid of the present embodiment may contain other additives as long as the effects of the present embodiment are not impaired. Examples of the additives include dissolution stabilizers, anti-drying agents, antioxidants, viscosity adjusters, pH adjusters, and fungicides, etc.

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

[0041] Also, the adjustment of the pH of the treatment liquid can be carried out, for example, by adjusting the addition amount of succinic acid.

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

[0043] [Method for producing treatment liquid] The method for producing the treatment liquid of this embodiment is not particularly limited, but an example will be described. First, a basic ion exchange resin is filled in a column, and a cationic polymer is passed through to obtain an adjusted cationic polymer with 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 (for example, surfactants, etc.) added as necessary.

[0045] [Inkjet recording method using treatment liquid] Next, the usage method, etc. of the treatment liquid of this embodiment will be described. The treatment liquid of this embodiment can be used as a pretreatment liquid, for example, in an inkjet recording apparatus 10 as shown in FIG. 1.

[0046] Specifically, the inkjet recording apparatus 10 shown in FIG. 1 has a treatment 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 treatment head 1 discharges the treatment liquid for pretreatment before image formation to at least the image formation region of the recording target P. The treatment liquid used here is the above-described treatment liquid. The treatment head 1 is not particularly limited, and examples thereof include a piezo head and a thermal inkjet head. The inkjet printing apparatus 10 of this embodiment may further include one or more treatment liquid tanks (not shown) for storing the treatment liquid, and in that case, the treatment liquid is supplied from the treatment liquid tank to the treatment head 2.

[0048] The recording head 2 ejects ink onto the 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 each eject ink of a different color (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 1 to 3 or 5 or more. The recording head 2 is not particularly limited, and examples include a piezo head and a thermal inkjet head.

[0049] The mounting table 3 has the recording target P mounted thereon. The processing head 1 and the recording head 2 are disposed above the mounting table 3 so that the processing liquid and ink can be ejected onto the recording target P. By driving a motor (not shown), the mounting table 3 moves horizontally in the direction from the processing head 1 toward the recording head 2 (for example, the left direction in FIG. 1). When the mounting table 3 moves horizontally, the recording target P on the mounting table 3 is conveyed.

[0050] In the present embodiment, the recording target P is not particularly limited and may be a medium such as plain paper. However, since the processing liquid of the present embodiment is used for the purpose of printing, further effects can be exhibited. Therefore, the recording target P is preferably a medium that can be a printing target.

[0051] In the formation of inkjet recording, first, the mounting table 3 on which the recording target P is mounted moves horizontally, and the recording target P is conveyed to a position facing the processing head 1. The processing liquid is ejected from the processing head 1 onto the recording target P. The processing head 1 may eject the processing liquid only onto the image forming area of the recording target P, may eject the processing liquid onto an area wider than the image forming area of the recording target P, or may eject the processing liquid onto the entire surface of the recording target P. In order to reduce the amount of the processing liquid used and suppress a decrease in the touch feeling of the printed matter, it is preferable that the processing head 1 ejects the processing liquid only onto the image forming area of the recording target P.

[0052] After the processing liquid is discharged from the processing head 1, the placement table 3 on which the recording target P is placed further moves horizontally, and the recording target P is conveyed to a position facing the recording head 2. Then, ink is discharged from the recording head 2 onto the image formation area of the recording target P. In this way, an image is formed by the ink on the image formation area of the recording target P.

[0053] Although not shown in the figure, after the ink is discharged by the recording head 2, the placement table 3 on which the recording target P is placed may further move horizontally, and a post-treatment liquid may be discharged from another processing head. The post-treatment liquid is similarly a non-color-developing treatment liquid that does not develop color even when it adheres to the recording target P, and is a treatment liquid that exhibits a function of enhancing the fixing property and fastness (resistance to rubbing and scratching) of the ink image printed on the recording target P by the recording head 2. As such a post-treatment liquid, a silicone-based treatment liquid or the like can be used. In this way, a treatment film is formed by the post-treatment liquid on the image formed on the image formation area of the recording target P.

[0054] After the post-treatment liquid is discharged, the placement table 3 on which the recording target P is placed further moves horizontally, and the recording target P is conveyed to a position facing a heating unit (not shown), and the heating unit heats the recording target P, whereby the ink and the treatment liquid are dried. The heating temperature is, for example, 120°C or higher and 180°C or lower. The heating time is, for example, 1 minute or longer and 10 minutes or shorter. By heating, the volatile components contained in the ink and the treatment liquid are dried, and the fixing of the ink and the treatment liquid to the recording target P is promoted. As a result, a recording target P on which an image is formed by the ink and treated by the treatment liquid is formed.

[0055] Note that the processing liquid of the present embodiment is not limited to use in the inkjet recording apparatus 10, and can be changed, for example, as shown in the following modification examples. For example, the inkjet recording apparatus 10 may be provided with a spray for spraying the processing liquid instead of the processing head 1 that discharges the processing liquid. Alternatively, the processing by the processing liquid may be performed by immersing the recording target P in a tank in which the processing liquid is stored. Further, in the inkjet recording apparatus 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, in the conveyance direction of the recording target P, the mounting table 3 moves horizontally, or the processing head 1 and the recording head 2 move horizontally, and the processing head 1 and the recording head 2 may move horizontally in a direction perpendicular to the conveyance direction of the recording target P.

[0056] That is, as long as the processing head 1 and the recording head 2 are provided, the effects of using the processing liquid of the present embodiment can be obtained regardless of the type of the inkjet recording apparatus.

[0057] [Ink] The ink used for inkjet recording together with the processing liquid of the present embodiment is not particularly limited. 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, if necessary.

[0058] As the pigment, for example, a dispersible pigment dispersed in an aqueous medium can be used. From the viewpoint of obtaining an ink excellent in image density, hue, and color stability, the volume median diameter (D 50 ) is preferably 30 nm or more and 250 nm or less, and more preferably 70 nm or more and 160 nm or less. In this specification, the measured value of the volume median diameter (D 50 ) is the median diameter measured using a laser diffraction / scattering particle size distribution measuring device ("LA-950" manufactured by Horiba, Ltd.).

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

[0060] The content rate of the pigment 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 weight of the entire ink. When the content rate of the pigment is 1% by weight or more, the image density of the formed recording material can be improved. When the content rate of the pigment is 12% by weight or less, an ink with high fluidity can be obtained.

[0061] In particular, the ink of the present embodiment preferably contains an anionic pigment. Thereby, the cationic polymer contained in the above-described treatment liquid and the anionic pigment cause electrical reaction aggregation on the surface of the recording target, so that penetration of the binder resin (binder resin described later) contained in the ink into the recording medium can be suppressed. This can reduce the penetration of the binder resin into the gaps between the fibers and the binding of the fibers to each other when the recording medium is a fabric. Thereby, the texture (such as touch) of the fabric to be dyed can be enhanced.

[0062] As the anionic pigment, more preferably, an anionic pigment 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 is used.

[0063] The aqueous medium contained in the ink of this embodiment is a medium mainly composed of water. The aqueous medium may function as a solvent or as a dispersion medium. Specific examples of the aqueous medium include water or a mixture of water and a polar solvent. Examples of the polar solvent contained in the aqueous medium include methanol, ethanol, isopropyl alcohol, butanol, and methyl ethyl ketone. The water content 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, by containing a surfactant in the ink, the wettability of the ink with respect to the recording target is improved. Examples of the surfactant include anionic surfactants, cationic surfactants, nonionic surfactants, and amphoteric surfactants. The surfactant contained in the ink is preferably a nonionic surfactant. The nonionic surfactant preferably has an acetylene glycol structure, and more preferably is an acetylene diol ethylene oxide adduct. The HLB value of the surfactant is preferably 3 or more and 20 or less, more preferably 6 or more and 16 or less, and even more preferably 7 or more and 10 or less. The HLB value of the surfactant is calculated, for example, by the Griffin method using the formula "HLB value = 20 × (sum of the formula weights of the hydrophilic parts) / molecular weight". In order to improve the image density while suppressing image offset, the content of the surfactant is preferably 0.1% by weight or more and 5.0% by weight or less, and more preferably 0.5% by weight or more and 2.0% by weight or less, based on the weight of the entire ink.

[0065] Furthermore, by containing a polyol in the ink, the viscosity of the ink is suitably adjusted. As the polyol contained in the ink, a diol or a triol is preferable. Examples of the diol include glycol compounds, and more specifically, ethylene glycol, propylene glycol, diethylene glycol, triethylene glycol, and tetraethylene glycol. Examples of the triol include glycerin.

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

[0067] The binder resin particles contained in the ink of the present embodiment exist in a dispersed state in an aqueous medium. The binder resin particles function as a binder that binds the printing target and the pigment. Therefore, by containing the binder resin particles in the ink, a printed matter excellent in the fixing property of the pigment can be obtained.

[0068] Examples of the resin contained in the binder resin particles include urethane resins, (meth)acrylic resins, styrene-(meth)acrylic resins, styrene-maleic acid copolymers, vinyl naphthalene-(meth)acrylic acid copolymers, and vinyl naphthalene-maleic acid copolymers. As the resin contained in the binder resin particles, a urethane resin is preferable. 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 to 20% by weight, more preferably 2 to 10% by weight, based on the weight of the entire ink. When the content of the binder resin particles is 1% by weight or more, a recording target excellent in the fixing property of the pigment 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 ejected onto the recording target.

[0070] Furthermore, the ink of the present embodiment may further contain known additives (more specifically, dissolution stabilizers, anti-drying agents, antioxidants, viscosity modifiers, pH adjusters, fungicides, etc.) as necessary.

[0071] The ink used in the present embodiment is produced, for example, by mixing a pigment, an aqueous medium, and components added as necessary (for example, surfactants, polyols, and binder resin particles) using a stirrer. The mixing time is, for example, 1 minute or more and 30 minutes or less.

[0072] [Ink set] The present embodiment also includes an ink set containing the above-described inkjet treatment liquid and inkjet ink.

[0073] The ink for inkjet 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 printing, it is preferably a printing ink set because it exhibits an excellent effect of enhancing the texture of the printing target.

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

[0076] When using a pigment ink that enables printing on many fabric types, it is necessary to fix the pigment on the fabric surface. If it cannot be fixed on the fabric surface, the rubbing fastness will be poor. On the other hand, if the pigment and the binder resin do not stay on the surface of the fabric and penetrate deeply, not only will the color development be poor, but there is also a problem that the ink and the binder resin enter between the fibers, making the feel hard, that is, the texture deteriorates.

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

[0078] Specifically, the method can be carried out in substantially the same manner as the recording method described in the above "inkjet recording method using a treatment liquid", except that the recording target is changed to a printing target. Any cloth can be used as the printing target. Specifically, it may be a woven fabric, a knitted fabric, or a non-woven fabric. For example, cotton fabric, silk fabric, hemp fabric, acetate fabric, rayon fabric, nylon fabric, polyurethane fabric, and polyester fabric can be mentioned.

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

[0080] According to the printing method of this embodiment, while suppressing corrosion of the inkjet head member and yellowing of the printing target, excellent color development can be obtained, and furthermore, deterioration of the texture of the fabric that is the printing target can also be suppressed, so it is very useful in industrial applications.

[0081] In this embodiment, the treatment liquid has the advantage that it does not require labor such as padding and drying the fabric in advance, and by placing it on the fabric with an inkjet system, the labor for fabric preparation can be greatly reduced.

[0082] [Recording Device] Furthermore, the recording device 10 shown in FIG. 1 will be described in detail. Hereinafter, as a specific example of the recording device, an inkjet printer equipped with an ink head that discharges ink for image formation onto a wide and long recording medium will be exemplified. The inkjet printer is suitable for digital printing that prints images such as characters and patterns on a recording medium made of a fabric such as a woven fabric or a knitted fabric by an inkjet method. Of course, the recording device according to the present disclosure can also be used for applications that print various images on a recording medium such as a paper sheet or a resin sheet.

[0083] · Overall Configuration of Inkjet Printer FIG. 2 is a perspective view showing the overall configuration of an inkjet printer 100 according to the first embodiment of the present disclosure, and FIG. 3 is a schematic cross-sectional view taken along line III-III of FIG. 2. The inkjet printer 100 is a printer that prints an image on a wide and long work W (recording medium) by an inkjet method. As an example, the width of the work W extends several meters. The printer 100 includes a device frame 11, a work conveyance unit 20 incorporated in the device frame 11, and a carriage 300. In the present embodiment, the left-right direction is the main scanning direction S (FIG. 4) during printing on the work W, and the direction from the rear to the front is the sub-scanning direction (the conveyance direction F of the work W which is a direction intersecting the main scanning direction S).

[0084] The device frame 11 forms a framework for mounting various constituent members of the inkjet printer 100. The work conveyance unit 20 is a mechanism that intermittently feeds (conveys) the work W so that the work W advances in the conveyance direction F from the rear to the front in the printing area where the inkjet printing process is performed. The carriage 300 mounts an ink head 4, a pretreatment liquid head 5, a post-treatment liquid head 6, and a sub-tank 7, and reciprocates in the main scanning direction S (left-right direction) intersecting the conveyance direction F of the work W during the inkjet printing process.

[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 constituent members of the inkjet printer 100 and has a left-right width corresponding to the work conveyance unit 20. The right frame 112 and the left frame 113 are erected adjacent to the right and left of the central frame 111, respectively. The area between the right frame 112 and the left frame 113 is a printing area 12 where printing processing is executed on the work W.

[0086] The right frame 112 forms a maintenance area 13. The maintenance area 13 is an area for retracting the carriage 300 when the printing process is not executed. In the maintenance area 13, cleaning processes, purge processes, etc. of the nozzles (discharge holes) of the ink head 4, the pretreatment liquid head 5, and the post-treatment liquid head 6 are performed, and a cap is fitted. The left frame 113 forms a turning area 14 of the carriage 300. The turning area 14 is an area where the carriage 300 that has scanned the printing area 12 from right to left in the printing process temporarily enters when performing a reverse main scan.

[0087] Above the device frame 11, a carriage guide 15 for causing the carriage 300 to reciprocate in the left-right direction is assembled. The carriage guide 15 is a flat plate-shaped member that is long in the left-right direction and is disposed above the work conveyance unit 20. A timing belt 16 is assembled to the carriage guide 15 so as to be able to move in a circumferential manner in the left-right direction (main scanning direction). The timing belt 16 is an endless belt and is driven to move in a circumferential manner in the left direction or the right direction.

[0088] The carriage guide 15 is equipped with a pair of upper and lower guide rails 17 that hold the carriage 300 in a state where it can reciprocate in the main scanning direction S and extend in parallel in the left-right direction. The carriage 300 is engaged with the guide rails 17. Further, the carriage 300 is fixed to the timing belt 16. The carriage 300 moves in the left direction or the right direction along the carriage guide 15 while being guided by the guide rails 17 as the timing belt 16 moves in a circumferential manner in the left direction or the right direction.

[0089] Referring mainly to FIG. 3, the work conveyance unit 20 includes a delivery roller 21 that feeds out the work W before printing and a take-up roller 22 that takes up the work W after printing. The delivery roller 21 is disposed at the lower rear of the apparatus frame 11 and is the take-up shaft of the delivery roll WA which is a winding body of the work W before printing. The take-up roller 22 is disposed at the lower front of the apparatus frame 11 and is the take-up shaft of the take-up roll WB which is a winding body of the work W after the printing process. A first motor M1 is attached to the take-up roller 22 to rotationally drive the take-up roller 22 about its axis and execute the take-up operation of the work W.

[0090] The path between the delivery roller 21 and the take-up roller 22 and passing through the printing area 12 serves as the conveyance path of the work W. In this conveyance path, a first tension roller 23, a work guide 24, a conveyance roller 25, a pinch roller 26, a folding roller 27, and a second tension roller 28 are arranged in order from the upstream side. The first tension roller 23 applies a predetermined tension to the work W upstream of the conveyance roller 25. The work guide 24 changes the conveyance direction of the work W from upward to forward and feeds the work W into the printing area 12.

[0091] The conveyance roller 25 is a roller that generates a conveyance force for intermittently feeding the work W in the printing area 12. The conveyance roller 25 is rotationally driven about its axis by a second motor M2, and intermittently conveys the work W in the forward direction (predetermined conveyance direction F) so that the work W passes through the printing area 12 (image formation position) facing the carriage 300. The pinch roller 26 is disposed so as to face the conveyance roller 25 from above and forms a conveyance nip portion with the conveyance roller 25.

[0092] The folding roller 27 changes the conveyance direction of the workpiece W that has passed through the printing area 12 from the forward direction to the downward direction, and guides the workpiece W after the printing process to the take-up roller 22. The second tension roller 28 applies a predetermined tension to the workpiece W on the downstream side of the conveyance roller 25. Below the conveyance path of the workpiece W in the printing area 12, a platen 29 is arranged.

[0093] The carriage 300 reciprocates in the main scanning direction S (the left - right direction in this embodiment), which intersects (orthogonal in this embodiment) the conveyance direction F, while being cantilever - supported by the guide rail 17. The carriage 300 includes a carriage frame 30, an ink head 4, a pretreatment liquid head 5, a post - treatment liquid head 6, and a sub - tank 7 (Fig. 4) 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 above - mentioned heads 4 to 6. 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 engaging portion that is held by the guide rail 17 in a cantilever state. The head support frame 31 is a horizontal plate whose rear - end side is cantilever - supported by the guide rail 17 by the engaging portion.

[0095] Note that the cantilevered state means that in the carriage 300, the engaging portion (back frame 32), which is the portion held by the guide rail 17 as the holding member, exists only on one side, either the upstream side or the downstream side, from the center of the carriage 300 in the conveyance direction F, and there is no other engaging portion on the side opposite to the side where the engaging portion exists. Further, the engaging portion may be disposed outside the range where the ink head 4 and the processing head are disposed in the conveyance direction F. That is, the engaging portion may be disposed only on the upstream side or only on the downstream side with respect to the range where the ink head 4 and the processing head are disposed in the conveyance direction F.

[0096] ·Details of the carriage Further explanation will be given about the carriage 300. FIG. 4 is an enlarged perspective view of the carriage 300 shown in FIG. 2. In FIG. 4, the conveyance direction F (sub-scanning direction) of the workpiece W and the main scanning direction S which is the moving direction of the carriage 300 are shown. In FIG. 4, an example is shown in which a plurality of ink heads 4 that eject ink for image formation onto the workpiece W, a pretreatment liquid head 5 and a post-treatment liquid head 6 that eject a non-color-developing treatment liquid, and a plurality of sub-tanks 7 that supply the ink and the treatment liquid to these heads 4 to 6 are mounted on the carriage 300.

[0097] Each of the ink heads 4 includes a number of nozzles (ink ejection holes) that eject ink droplets by an ejection method such as a piezo method using a piezo element or a thermal method using a heating element, and an ink passage that guides the ink to the nozzles. As the ink, for example, the ink as described above can be used. The plurality of ink heads 4 in the present embodiment can eject 8 colors of ink. The ink heads 4 are mounted on the head support frame 31 of the carriage 300 so as to be arranged in two rows in the main scanning direction S. Each color ink head 4 has two heads respectively.

[0098] Specifically, the ink head 4 has a first upstream ink head 41A and a first downstream ink head 41B. These ink heads 4 eject yellow ink. Further, the ink head 4 has 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 that eject the same color ink are arranged at positions shifted from each other in the conveyance direction F and the main scanning direction S. Taking these two ink heads 4 as a set, a total of eight sets of ink heads 4 (41A to 48A, 41B to 48B) eject inks of different colors from each other.

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

[0100] Note that the continuous arrangement of heads along the main scanning direction S, which is constituted by the ink head 4, the pretreatment liquid head 5, and the post-treatment liquid head 6, is referred to as a head row, or simply a row. Further, the continuous arrangement of heads along the conveyance direction F, which is constituted by the ink head 4, the pretreatment liquid head 5, and the post-treatment liquid head 6, is referred to as a head line, or simply a line.

[0101] The pretreatment liquid head 5 discharges a pretreatment liquid for performing a predetermined pretreatment on the workpiece W. The pretreatment liquid is discharged from the pretreatment liquid head 5 to a position on the workpiece W where ink has not yet been discharged from the ink head 4. As the pretreatment liquid, the treatment liquid of the present embodiment is used. Thereby, it is possible to suppress yellowing of the treatment liquid or the components of the treatment liquid. Furthermore, since yellowing of the recording medium can be suppressed, for example, when the apparatus of the present embodiment is used for printing, yellowing of the fabric to be printed, etc. can be suppressed.

[0102] The post-treatment liquid head 6 discharges a post-treatment liquid for performing a predetermined post-treatment on the workpiece W to which ink has adhered. The post-treatment liquid is discharged from the post-treatment liquid head 6 to a position on the workpiece W after ink has been discharged from the ink head 4. The post-treatment liquid is similarly a non-color-developing 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 enhancing the fixability and fastness (resistance to rubbing and scratching) 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 pretreatment liquid are different treatment liquids. Specifically, the components contained in the post-treatment liquid and the pretreatment liquid are different.

[0103] Here, the non-color-developing treatment liquid refers to a liquid that is not recognized by the human eye as having developed color when printed alone on a recording medium. The color here includes those with a chroma of 0 such as black, white, and gray. The non-color-developing treatment liquid is basically a transparent liquid. However, for example, when looking at 1 liter of the treatment liquid in a liquid state, it is not completely transparent and may appear slightly white. Such a color is very light and cannot be recognized by the human eye as having developed color when printed alone on a recording medium. Note that depending on the type of the treatment liquid, there may be changes such as gloss on the recording medium when printed alone on the recording medium, but such a state is not color development.

[0104] In the present embodiment, the pretreatment liquid and the post-treatment liquid may be discharged onto substantially the entire surface of the workpiece W, or the pretreatment liquid and the post-treatment liquid may be selectively discharged in accordance with the image to be printed, similarly to the ink.

[0105] Next, a case where the pretreatment liquid and the post-treatment liquid are selectively discharged will be described. As described above, on the work W of the portion to be printed in color according to the image, the pretreatment liquid, the ink, and the post-treatment liquid are discharged in this order. In this case, the ink may be one color or a plurality of colors. Basically, the pretreatment liquid and the post-treatment liquid are not discharged to the portion where no color is printed, that is, the portion where the ink is not discharged. Note that, in order to adjust the image quality of the printed image, the texture of the work W, etc., a part of the selection of the discharge of the pretreatment liquid and the post-treatment liquid may be made different from the discharge of the ink.

[0106] As shown in FIG. 4, an opening 31H is provided at the position of the head of the head support frame 31. The ink head 4, the pretreatment liquid head 5, and the post-treatment liquid head 6 are assembled to the head support frame 31 so as to be fitted into the respective openings 31H. From each opening 31H, the nozzles disposed on the lower end surfaces of the respective heads 4, 5, 6 are exposed.

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

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

[0109] The first supply sub-tank 71A and the first recovery sub-tank 71B located at the leftmost side of the carriage 300 store yellow ink containing pigments. The first supply sub-tank 71A supplies yellow ink to the first upstream ink head 41A and the first downstream ink head 41B (both 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, some of the yellow ink is discharged 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 third sub-tanks to eighth sub-tanks also has the same structure and function as described above.

[0110] Also, the pretreatment supply sub-tank 7FA supplies the pretreatment liquid to the pretreatment liquid head 5, and the pretreatment recovery sub-tank 7FB recovers the pretreatment liquid from the pretreatment liquid head 5. Also, 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 the present embodiment is an all-in-one type printer in which three types of heads, namely the ink head 4, the pretreatment liquid head 5, and the post-treatment liquid head 6, are mounted on a single carriage 300. According to this inkjet printer 100, for example, in the printing step of performing inkjet printing on a fabric in digital resist printing, the step of discharging the pretreatment liquid and the step of discharging the post-treatment liquid can be integrally executed. Therefore, the resist process can be simplified and the resist device can be made compact.

[0112] Note that the inkjet printer 100 according to this embodiment performs printing processing on the work W in a serial printing method. Specifically, when the work W has a wide size, printing cannot be performed while continuously feeding the work W. The serial printing method is a printing method that repeats the reciprocating movement of the carriage 300 equipped with the ink heads 4 of each color in the main scanning direction S and the intermittent feeding in the conveying direction F of the work W.

[0113] Specifically, while the carriage 300 moves in the forward path direction, which is one direction in the main scanning direction S, printing of the strip-shaped image is performed. During the main scanning in the forward path direction, the feeding of the work W is stopped. After printing the strip-shaped image, the work W is fed out in the conveying direction F by a predetermined pitch. At this time, the carriage 300 waits in the folding area 14 on the left end side. After the work W is fed out, the carriage 300 folds back in the return path direction opposite to the forward path direction along with the reverse movement of the timing belt 16. The work W is in a stopped state. Then, while the carriage 300 moves in the return path direction, the next strip-shaped image is printed on the upstream side of the strip-shaped image. Hereinafter, the same operation is repeated.

Example

[0114] Hereinafter, the present disclosure will be described more specifically by way of examples, but the present disclosure is not limited by the examples in any way.

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

[0116] ·Preparation of treatment liquid The adjusted cationic polymer solution 1 obtained above: 1:3 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, the balance: water were mixed, and then filtered through a 5 μm filter to obtain Treatment Liquid 1 (pH 8.0, chloride ion concentration 4.5 g / L).

[0117] (Example 2) Treatment Liquid 2 was obtained in the same manner as in Example 1, except that the adjusted cationic polymer solution 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 Liquid 3 was obtained in the same manner as in Example 1, except that the 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) ·Adjustment of cationic polymer The adjusted cationic polymer solution 1 obtained in Example 1 was passed through a column again at a flow rate of 50 ml / min to obtain an adjusted cationic polymer solution 2. The solid content of the obtained adjusted cationic polymer solution 2 was 40%.

[0120] ·Preparation of treatment liquid Treatment Liquid 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 Nitto Boehringer Medical Co., Ltd.): 3 parts by weight (solid content), 1N sodium hydroxide: 1%, nonionic surfactant "Surfynol 440" (manufactured by Nissin Chemical Industry Co., Ltd.): 1 part by weight, propylene glycol: 10 parts by weight, the balance: water were mixed, and then filtered through a 5 μm filter to obtain Treatment Liquid 8 (pH 7.3, chloride ion concentration 5.6 g / L).

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

[0123] (Comparative Example 3) 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, balance: water were mixed and then filtered through a 5 μm filter to obtain treatment liquid 10 (pH 10.9, chloride ion concentration 4.6 g / L).

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

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

[0126] (Preparation of Ink) Anionic pigment dispersion "AE-2078F" (manufactured by Sanyo Color Works 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 "Surfinol 440" (manufactured by Nissin Chemical Industry Co., Ltd.), propylene glycol, and water were used to prepare the ink.

[0127] The specific formulation of the ink was as follows: pigment: 4% by weight, urethane: 8% by weight, propylene glycol: 30% by weight, surfactant: 1% by weight, and the balance: water. After mixing at the above ratios, filtration was performed using a 5-μm filter to obtain the ink.

[0128] (Preparation of post-treatment liquid) An emulsion of silicone oil "POLON-MF-51" (manufactured by Shin-Etsu Chemical Co., Ltd.) with a silicone oil content of 39%, propylene glycol, and water were used to prepare the post-treatment liquid. The specific formulation was as follows: silicone oil: 10% by weight, propylene glycol: 30% by weight, and the balance: water. After mixing at the above ratios, filtration was performed using a 5-μm filter to obtain the post-treatment liquid.

[0129] <Printing> For inkjet printing, a flatbed printing jig with KJ4B heads manufactured by Kyocera arranged in the conveying direction was used. The pre-treatment liquid was loaded into the first head, the ink into the second head, and the post-treatment liquid into the third head, and inkjet printing was performed under the following conditions. Note that only in Comparative Example 4 was printing performed without the pre-treatment liquid. Fabric used: Polyester Tropical Fabric / head distance: 3 mm, head temperature: 25 °C Drying: 150 °C for 3 minutes (oven)

[0130] <Evaluation test> (Image density) Color measurement was performed using a fluorescence spectrophotometer FD-5 (manufactured by Konica Minolta). The evaluation criteria were as follows. Image density (OD) 1.3 or higher: "Excellent", very good color development Image density (OD) 1.25 or higher and less than 1.3: "Good", good color development Image density (OD) less than 1.25: "Defective", color development defect

[0131] (Yellowing of the fabric) Using a fluorescence spectrophotometer FD-5 (manufactured by Konica Minolta), the density of the fabric itself and the density (Yellow) of the part with the pretreatment liquid were measured, and the difference between the two was defined as ΔOD. The evaluation criteria are as follows. ΔOD: less than 0.05: "Excellent", yellowing is not visible visually and is very good ΔOD: 0.05 or more and less than 0.10: "Good", yellowing is slight and good ΔOD: 0.10 or more: "Defective", yellowing

[0132] (Texture) The unused printing target 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 target was defined as the loop height before printing. Next, the area where the solid image of the evaluation printed fabric 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 printed fabric was defined as the loop height after printing. According to the formula "change rate of loop height = 100 × loop height after printing / loop height before printing", the change rate of the loop height (unit: %) before and after printing was calculated. The lower the change rate of the loop height, the less the printed object hardens and swells after printing, indicating that the decrease in the touch feeling of the printed fabric is suppressed. The evaluation criteria were set as follows. Less than 130%: "Good", the change in texture is small and good 130% or more: "Defective", the texture becomes hard and changes poorly

[0133] (Corrosion of metal members) Approximately 0.1 g of a piece of SUS430 was precisely weighed and immersed in 50 g of the treatment liquid in a 50 ml glass bottle, the lid of the glass bottle was closed, and it was left at 60 °C for 1 month. After 1 month, the SUS430 piece was taken out, rinsed with ion-exchanged water, dried, and weighed. Then, the weight change rate was obtained by the following formula. Weight after standing / Weight before standing × 100 = Weight change rate (%) The evaluation criteria were as follows. Weight change rate (%): 98 - 100% "Good". There is no corrosion and the weight change is extremely small. Weight change rate (%): Less than 98% "Poor". Corrosion progresses and the weight reduction is large.

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

[0135]

Table 1

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

[0137] On the other hand, in Comparative Example 1 using a treatment liquid that does not contain succinic acid and has a halogen ion (chloride ion) concentration exceeding 5 g / L, corrosion of the metal member occurred. Also, in Comparative Examples 2, 3, and 6 using treatment liquids with a pH exceeding 9, yellowing of the fabric occurred. In Comparative Example 4 where the pretreatment liquid was not used, the image density decreased and the texture was inferior. Furthermore, in Comparative Example 5 using a treatment liquid in which acetic acid was used instead of succinic acid, yellowing also occurred. Thus, although the comparative examples were inferior in the relative evaluation with respect to the examples, the implementation contents of the comparative examples themselves were not excluded or abandoned.

Explanation of Signs

[0138] 1 Processing head 2 Recording head 2a First recording head 2b Second recording head 2c Third recording head 2d Fourth recording head 3 Mounting table 10 Inkjet recording apparatus P Recording target

Claims

1. It contains a cationic polymer and succinic acid, The halogen ion concentration is 5 g / L or less. An inkjet processing solution wherein the succinic acid content is 0.5% by weight or more and 20% by weight or less of the total processing solution.

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

3. The inkjet processing solution according to claim 1, wherein the content of the cationic polymer is 0.3% by weight or more and 35% by weight or less of the total processing solution.

4. The inkjet processing solution according to claim 1, wherein the weight ratio of the cationic polymer to the succinic acid (cationic polymer / succinic acid) is 0.20 or more and 3.50 or less.

5. An inkjet processing solution according to any one of claims 1 to 4, for use in textile printing.

6. The inkjet processing solution according to claim 5, which is for textile printing using an inkjet ink containing an anionic pigment.

7. An inkjet processing solution according to any one of claims 1 to 4, An ink set comprising an inkjet ink containing an anionic pigment.

8. A method for producing a printed material, comprising the steps of: applying an inkjet processing solution according to any one of Claims 1 to 4 to a coating area to be printed; and applying an inkjet ink containing an anionic pigment to the coating area.

9. An inkjet recording method comprising the steps of: ejecting an inkjet processing solution according to any one of Claims 1 to 4 onto an image forming region to be recorded; and ejecting an inkjet ink containing an anionic pigment onto the image forming region.

Images