JP5569036B2 - Inkjet printing method - Google Patents

Description

  The present invention relates to an ink-jet printing method, and more particularly to an ink-jet printing method capable of performing printing that can sufficiently dye the inside and back of a fabric and can reduce bleeding.

  Conventionally, a screen printing method, a roller printing method, a rotary screen printing method, a transfer printing method, or the like is used as a method for printing an image on a fabric. However, it is necessary to prepare expensive screen frames, engraving rollers, transfer paper, etc. for every change in image design, so it is not suitable for low-volume production of various products and responds quickly to diversification of fashion. It was difficult.

  In order to eliminate the disadvantages of the conventional printing method, a technique has been developed in which a sample is read by a scanner, image processing is performed by a computer, and the result is printed by an ink jet method. The ink jet recording method is a recording method in which ink droplets are ejected from an ink head toward a recording medium (for example, paper or fabric), and the droplets are attached to the recording medium. The mechanism is relatively simple and inexpensive. In addition, a high-definition and high-quality image can be formed. When such an ink jet method is applied to a printing method, it is not necessary to prepare a plate that is required in the conventional printing method, and an image having excellent gradation can be quickly formed. There is an advantage that it is possible to deal with small-quantity production. Further, according to the ink jet system, since only a necessary amount of ink is used at the time of image formation, there is an environmental advantage such as less waste liquid as compared with conventional screen printing or the like.

  However, when the ink jet method is directly applied to textile printing or the like, there is a problem that bleeding is remarkable and sharpness is inferior. That is, unlike paper, fabric has directionality in the fiber structure and woven structure, and the gap is larger than that of paper. Therefore, when the ink ejected from the ink head adheres to the fabric, the fabric bleeds in the vertical and horizontal directions and becomes clear. Can not get a good image. Various attempts have been made to deal with such bleeding problems. For example, an ink retaining agent is attached to the fabric surface to form an ink retaining layer on the printing surface, and ink is deposited on the ink retaining layer, and the ink is transferred to the fiber during post-processing (fixing). It has been proposed that bleeding can be suppressed by the above (for example, JP-A-3-137283).

  Although the above method can effectively suppress fabric bleeding due to ink jet printing, when the above method is applied to a thick fabric or a raised fabric, ink may not penetrate into the fabric and dyeing may be insufficient. . Also, when printing on a thin fabric, it actively suppresses the difference between the front and back of the pattern, that is, the density difference between the pattern formed on the printing surface and the pattern viewed from the non-printing surface (back side), Although the same pattern may be printed on the front and back of the fabric, the above method cannot be applied because the difference between the front and back of the pattern is promoted.

  In order to solve the above problems, US Patent Publication No. US2008 / 00130 discloses a method of performing inkjet printing by discharging a low-viscosity penetrating liquid together with ink as an auxiliary agent in order to promote the penetration of the ink into the back surface of the fabric. Proposed. However, in this method, since the penetrating liquid and the ink are simultaneously adhered to the printing surface of the fabric, ink bleeding on the printing surface cannot be eliminated.

  Japanese Patent Application Laid-Open No. 2002-105875 discloses a method of treating a fabric with both a high wettability treatment liquid and a low wettability treatment liquid before ink jet printing, thereby allowing ink permeability and bleeding. It has been proposed that it can be controlled. According to this method, even a thick fabric can be dyed to the inside and bleeding can be reduced, but the fabric needs to be pretreated with the above-mentioned two treatment liquids before ink jet printing. .

Japanese Patent Laid-Open No. 3-137283 US Patent Publication US2008 / 00130 JP 2002-105875 A

  The present inventors have recently made two liquid compositions having different penetrability adhere to both sides of a fabric before ink jet printing, and the liquid composition having the lower penetrability (high surface tension). It was found that by performing printing on the side of the fabric with the ink attached by an ink jet method, ink bleeding can be reduced and a fabric in which the dyeing density of the pattern on the front and back sides is not changed can be obtained. The present invention is based on this finding.

  Accordingly, an object of the present invention is to provide an ink jet printing method capable of reducing the ink bleeding and obtaining a fabric in which the pattern dyeing density does not change between the front and back sides.

The inkjet printing method according to the present invention is an inkjet printing method in which an ink containing a dye is printed on a fabric by an inkjet method,
A fabric backside treatment step of attaching the first liquid composition to one side of the fabric;
A fabric surface treatment step of attaching a second liquid composition to a fabric surface opposite to the surface to which the first liquid composition is adhered;
An ink jet printing process in which an ink composition containing a dye is discharged onto the fabric surface of the surface to which the second liquid composition is adhered after the fabric back surface treatment and the fabric surface treatment;
Comprising
The surface tension of the first liquid composition is lower than the surface tension of the second liquid composition.

  According to the present invention, before ink-jet printing, two types of liquid compositions having different penetrability are attached to both sides of the fabric, and on the side of the fabric side to which the liquid composition having the lower penetrability is attached. By performing printing by the ink jet method, it is possible to reduce the ink bleeding and obtain a fabric in which the pattern dyeing density does not change between the front and back sides.

Detailed description of the invention

  The inkjet printing method according to the present invention includes 1) a fabric back surface treatment step in which a liquid composition is adhered to one surface of a fabric, and 2) a fabric surface opposite to the surface to which the first liquid composition is adhered. A fabric surface treatment step for adhering the second liquid composition, and 3) containing a dye on the fabric surface to which the second liquid composition is adhered after the fabric back surface treatment and the fabric surface treatment. And an ink jet printing process for discharging the ink composition. Hereinafter, each step will be described in detail.

<Cloth back surface treatment process and fabric surface treatment process>
In the ink-jet printing method according to the present invention, first, two kinds of liquid compositions having different permeability are adhered to both surfaces (printed surface and non-printed surface) of the fabric. Further, by performing the ink jet printing described later on the fabric surface on which the liquid composition having a lower permeability, that is, a surface having a higher surface tension, is applied, ink bleeding can be reduced, and the pattern can be dyed on both sides. A fabric whose density does not change can be obtained. When ink-jet printing is performed after the liquid composition is attached to the printing surface of the fabric as in the past, the ink can sufficiently reach the thickness direction of the fabric due to the action of the liquid composition. Although it is possible to obtain a fabric that does not change the adhesion density, at the same time, the ink diffuses in the surface direction of the fabric, so that ink bleeding at the printing portion may be a problem. On the other hand, as in the present invention, a superpermeable liquid composition is attached to the back surface (non-printing surface) of the fabric, and a slowly permeable liquid composition is attached to the surface (printing surface) of the fabric. In addition, by performing printing by the ink jet method on the fabric surface side to which the slowly penetrating liquid composition is adhered, it is possible to obtain a fabric in which the dyeing density of the pattern does not change on the front and back, and at the same time, ink bleeding The reduction was an unexpected effect. Further, according to the textile printing method of the present invention, even with a thick fabric, there is little bleeding and a uniform dyeing concentration can be obtained in the thickness direction.

  As the liquid composition used in the fabric back surface treatment step and the fabric surface treatment, penetrants and surfactants usually used in ink jet textile printing inks can be suitably used. Examples of such penetrants include ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, polypropylene glycol, propylene glycol, butylene glycol, 1,2,6-hexanetriol, thioglycol, hexylene glycol, glycerin, and trimethylolethane. , Polyhydric alcohols such as trimethylolpropane, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, diethylene glycol monoisobutyl ether, diethylene glycol monohexyl ether, triethylene glycol monomethyl ether , Trieti Polyhydric alcohols such as ethylene glycol monoethyl ether, triethylene glycol monobutyl ether, hexaethylene glycol monoethyl hexyl ether (manufactured by Nippon Emulsifier Co., Ltd .: New Coal 1006), tetraethylene glycol monoethyl hexyl ether (manufactured by Nippon Emulsifier Co., Ltd .: New Coal 1004) Alkyl ethers, urea, 2-pyrrolidone, N-methyl-2-pyrrolidone, 1,3-dimethyl-2-imidazolidinone, and the like. Examples of polyhydric alcohol alkyl ethers include triethylene glycol monobutyl ether, diethylene glycol monobutyl ether, triethylene glycol monomethyl ether, diethylene glycol monoisobutyl ether, diethylene glycol monohexyl ether, hexaethylene glycol monoethylhexyl ether, tetraethylene glycol monoester. You may use ethylhexyl ether 1 type or in combination of 2 or more types.

  Examples of the surfactant include fatty acid salts; anionic surfactants such as alkyl sulfate esters; nonionic surfactants such as polyoxyethylene alkylphenyl ether; Surfynol 61, 82, 104, 440, 465 , 485 (all trade names, manufactured by Air Products and Chemicals), olphine E1010, olfin STG, olfin Y (all trade names, manufactured by Nissin Chemical), and the like; Cationic surfactants; amphoteric surfactants, organopolysiloxane surfactants such as KF-353A, KF6017, X-22-6551, AW-3 (all trade names, manufactured by Shin-Etsu Chemical Co., Ltd.), etc. Can be mentioned. The liquid composition preferably contains about 10 to 30% by mass of the above-described penetrant and about 0.1 to 3.0% by mass of a surfactant with respect to the total mass of the liquid composition.

  The liquid composition used in the present invention may contain an organic amine in order to improve the wettability of the fabric to improve the ink permeability and adjust the pH with the ink composition. As the organic amine, a tertiary amine can be preferably used, and examples thereof include alkanolamines such as triethanolamine. The content of the organic amine is generally 0.05 to 3.0% by mass with respect to the total mass of the liquid composition.

  In the present invention, the first liquid composition to be adhered to the non-printing surface (back surface) of the fabric and the second liquid composition to be adhered to the printing surface (front surface) of the first liquid composition It is necessary to prepare each liquid composition so that the surface tension is lower than the surface tension of the second liquid composition. However, those skilled in the art can prepare a liquid composition so as to obtain a desired surface tension by appropriately adjusting the contents of the above-described conventionally known penetrants, surfactants, organic amines and the like. it can. As long as the surface tension of the first liquid composition is lower than the surface tension of the second liquid composition, the surface tension of each liquid composition is not particularly limited. In applying the inkjet method as a means for adhering an object, the surface tension of the first liquid composition is set to a range of 28.0 to 30.0 mN / m (super permeability), and the surface of the second liquid composition The tension is preferably in the range of 30.0 to 35.0 mN / m (slow permeability). In addition, although the surface tension of a liquid composition can be measured on a platinum plate using the automatic dynamic surface tension meter CBVP-Z (made by Kyowa Interface Science Co., Ltd.), for example, it is not restricted to this.

  In the present invention, it is preferable to carry out the above-described fabric back surface treatment step and / or fabric surface treatment step by an inkjet method. That is, in the same manner as the ink jet printing process described later, the first and / or second liquid composition is filled in a cartridge, and liquid droplets of the liquid composition are discharged from the printer head onto the fabric. It is preferable that a back surface treatment step and / or a fabric surface treatment step is performed. In this way, by applying the ink jet method to the fabric back surface treatment step and / or the fabric surface treatment step, for example, the liquid composition and the dye ink composition are filled in the same cartridge, and the liquid composition is discharged from each printer head. Since the product and the dye ink composition can be discharged, the fabric back surface treatment step, the fabric surface treatment step and the ink jet printing step can be carried out using a single ink jet printer. Therefore, a series of inkjet printing processes can be greatly simplified.

  When the fabric back surface treatment step and / or the fabric surface treatment step is carried out by the ink jet method, it is preferable to contain a humectant from the viewpoint of improving the ejection stability from the nozzles of the recording head of the ink jet printer. As the humectant, a compound used as a humectant in a normal ink-jet printing ink composition can be used. For example, glycerin, ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, polyethylene glycol, propylene glycol , Dipropylene glycol, polypropylene glycol, 1,3-propanediol, 1,4-butanediol, 1,2-hexanediol, 1,5-pentanediol, 1,6-hexanediol, 1,2,6-hexane Polyols such as triol or pentaerythritol, and derivatives thereof such as ethers or esters thereof; lactams such as 2-pyrrolidone, N-methyl-2-pyrrolidone, or ε-caprolactam; urea, thiourea, ester Examples include ureas such as renurea or 1,3-dimethylimidazolidinone; saccharides such as maltitol, sorbitol, gluconolactone, or maltose, and one or more of these may be used. it can. The content of the humectant is preferably 4 to 40% by mass with respect to the total mass of the ink composition.

  The liquid composition used in the fabric back surface treatment step and / or the fabric surface treatment step contains water as a balance in addition to the above-described components. As water, it is preferable to use ion-exchanged water, ultrafiltered water, reverse osmosis water, pure water such as distilled water, or ultrapure water. In particular, water obtained by sterilizing these waters by ultraviolet irradiation or addition of hydrogen peroxide is preferable because generation of mold and bacteria is prevented for a long period of time. In addition, various additives that can be usually used in ink compositions for ink jet printing, such as antifungal agents, preservatives, antioxidants, ultraviolet absorbers, chelating agents, oxygen absorbers, etc., if necessary. One kind or two or more kinds can be contained.

  The above-described fabric back surface treatment step and fabric surface treatment step may be carried out first, and each printer head nozzle is formed using an ink jet printer or the like placed so that the printer head is opposed. The first and second liquid compositions may be discharged from the surface to simultaneously attach the liquid composition to the front and back surfaces of the fabric. However, before the fabric surface treatment step is performed, the fabric back surface treatment step is performed. Is preferred. After treating the back side of the fabric with a first liquid composition having a low surface tension (ie, high permeability), a second liquid composition having a higher surface tension (ie, less permeability) is used. The treatment of the surface of the fabric can reduce the difference in dyeing density between the front and back of the fabric, and is particularly suitable for printing on a thick fabric.

<Inkjet printing process>
In the present invention, as described above, after the liquid composition is adhered to both surfaces of the fabric, the ink composition containing the dye is applied to the fabric surface (surface) on which the second liquid composition is adhered. Discharging and printing are performed. Ink jet printing is preferably performed while the liquid composition adhering to the fabric remains in the fabric in the fabric back surface treatment step and the fabric surface treatment step. “The liquid composition remains on the fabric” means that the polyhydric alcohol component of the liquid composition remains on the fabric in a liquid state, and the evaporation of the liquid composition is in an equilibrium state. And the case of non-equilibrium state.

  The remaining amount of the liquid composition adhering to the fabric usually decreases over time due to evaporation of the liquid composition, but is also affected by the amount of adhering the liquid composition to the fabric and the printing environment. Is. In the present invention, the adhesion amount of the liquid composition to the fabric is preferably about 70 to 130% of the application amount of the ink composition to the fabric. By setting the adhesion amount of the liquid composition within the above range, bleeding can be further reduced. Moreover, it is preferable that the said fabric back surface treatment process, a fabric surface treatment process, and an inkjet printing process are implemented in the environment of 45-55% RH at 21-25 degreeC.

  More preferably, the ink jet printing process is performed immediately after the liquid composition is attached to the front and back surfaces of the fabric. For example, after a first liquid composition is attached to a fabric using a single ink jet printer, the fabric is then turned over and supplied to the ink jet printer again to attach the second liquid composition and the ink jet printing. And can be done. In addition, as described above, after the liquid composition is simultaneously adhered to the front and back surfaces of the fabric using the inkjet printer on which the opposing printer head is mounted, the inkjet printing may be performed only on the fabric surface. Good.

  The ink composition used in the ink jet printing process will be described. In the present invention, the type of the dye is not limited, but an ink composition containing an acid dye is preferably used. When printing on a fabric such as polyamide fiber using an ink containing an acid dye, by applying the fabric back surface treatment process as described above, a fabric in which the pattern dyeing density does not change on the front and back sides is obtained. In addition, the bleeding is remarkably improved. The acid dye can be used without particular limitation. For example, as the acid dye, C.I. I. Acid Yellow 1, 3, 7, 11, 17, 19, 23, 25, 29, 36, 38, 40, 42, 44, 49, 59, 61, 70, 72, 75, 76, 78, 79, 98, 99, 110, 111, 112, 114, 116, 118, 119, 127, 128, 131, 135, 141, 142, 161, 162, 163, 164, 165, 169, 207, 219, 246, C.I. I. Acid Red 1, 6, 8, 9, 13, 14, 18, 19, 24, 26, 27, 28, 32, 35, 37, 42, 51, 52, 57, 62, 75, 77, 80, 82, 83, 85, 87, 88, 89, 92, 94, 95, 97, 106, 111, 114, 115, 117, 118, 119, 129, 130, 131, 133, 134, 138, 143, 145, 149, 154, 155, 158, 168, 180, 183, 184, 186, 194, 198, 199, 209, 211, 215, 216, 217, 219, 249, 252, 254, 256, 257, 260, 262, 265, 266, 274, 276, 282, 283, 289, 303, 317, 318, 320, 321, 322, 361, C.I. I. Acid Blue 1, 7, 9, 15, 22, 23, 25, 27, 29, 40, 41, 43, 45, 49, 54, 59, 60, 62, 72, 74, 78, 80, 82, 83, 87, 90, 92, 93, 100, 102, 103, 104, 112, 113, 117, 120, 126, 127, 129, 130, 131, 133, 138, 140, 142, 143, 151, 154, 158, 161, 166, 167, 168, 170, 171, 175, 182, 183, 184, 185, 187, 192, 199, 203, 204, 205, 225, 229, 234, 236, 300, C.I. I. Acid Black 1, 2, 7, 24, 26, 29, 31, 44, 48, 50, 51, 52, 58, 60, 62, 63, 64, 67, 72, 76, 77, 94, 107, 108, 109, 110, 112, 115, 118, 119, 121, 122, 131, 132, 139, 140, 155, 156, 157, 158, 159, 191, 234, C.I. I. Acid Orange 1, 7, 8, 10, 19, 20, 24, 28, 33, 41, 43, 45, 51, 56, 63, 64, 65, 67, 74, 80, 82, 85, 86, 87, 88, 95, 122, 123, 124, C.I. I. Acid Violet 7, 11, 15, 31, 34, 35, 41, 43, 47, 48, 49, 51, 54, 66, 68, 75, 78, 97, 106, C.I. I. Acid Green 3, 7, 9, 12, 16, 19, 20, 25, 27, 28, 35, 36, 40, 41, 43, 44, 48, 56, 57, 60, 61, 65, 73, 75, 76, 78, 79, C.I. I. Acid Brown 2, 4, 13, 14, 19, 20, 27, 28, 30, 31, 39, 44, 45, 46, 48, 53, 100, 101, 103, 104, 106, 160, 161, 165, 188, 224, 225, 226, 231, 232, 236, 247, 256, 257, 266, 268, 276, 277, 282, 289, 294, 295, 296, 297, 299, 300, 301, 302, etc. It is done.

  In the present invention, the content of the dye is not particularly limited, but is preferably 1 to 10% by mass, more preferably 2 to 7% by mass with respect to the total mass of the ink composition. By setting the total content of the acid dyes to 1% by mass or more, a sufficient printing density can be obtained, and by setting the content to 10% by mass or less, the ejection stability required for the ink composition for inkjet is ensured. In particular, it is possible to prevent discharge failure particularly at high temperatures.

  The dye ink composition preferably contains a humectant from the viewpoint of improving the ejection stability from the nozzles of the recording head of the ink jet printer. As the humectant, a compound used as a humectant in a normal ink-jet printing ink composition can be used. For example, glycerin, ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, polyethylene glycol, propylene glycol , Dipropylene glycol, polypropylene glycol, 1,3-propanediol, 1,4-butanediol, 1,2-hexanediol, 1,5-pentanediol, 1,6-hexanediol, 1,2,6-hexane Polyols such as triol or pentaerythritol, and derivatives thereof such as ethers or esters thereof; lactams such as 2-pyrrolidone, N-methyl-2-pyrrolidone, or ε-caprolactam; urea, thiourea, ester Examples include ureas such as renurea or 1,3-dimethylimidazolidinone; saccharides such as maltitol, sorbitol, gluconolactone, or maltose, and one or more of these may be used. it can. The content of the humectant is preferably 4 to 40% by mass with respect to the total mass of the ink composition.

  In addition, the dye ink composition preferably contains a water-soluble organic solvent that also functions as a penetrant from the viewpoint of increasing the wettability to the fabric and increasing the permeability of the ink. As such a penetrating organic solvent, a compound used as a penetrant organic solvent in a normal ink-jet printing ink composition can be used. For example, lower alcohols such as ethanol or propanol; ethylene glycol monomethyl ether Or cellosolves such as ethylene glycol monoethyl ether; carbitols such as diethylene glycol monomethyl ether or diethylene glycol monoethyl ether; glycols such as ethylene glycol mono-n-butyl ether, diethylene glycol-n-butyl ether, or triethylene glycol-n-butyl ether Ethers etc. can be mentioned, These 1 type (s) or 2 or more types can be used. Moreover, the penetrant used for the above-mentioned liquid composition may be included. The content of the water-soluble organic solvent (penetrating agent) is preferably 2 to 15% by mass with respect to the total mass of the ink composition.

  Furthermore, from the same viewpoint, in addition to the water-soluble organic solvent, a surfactant that also functions as a penetrating agent may be added to the dye ink composition. As such penetrant surfactant, a compound that is used as a penetrant surfactant in a normal ink-jet printing ink composition can be used, and examples thereof include anionic properties such as fatty acid salts; alkyl sulfate ester salts and the like. Surfactant; Nonionic surfactant such as polyoxyethylene alkylphenyl ether; Acetylene such as Surfynol 61, 82, 104, 440, 465, 485 (all trade names, manufactured by Air Products and Chemicals) Examples thereof include glycol surfactants; cationic surfactants; amphoteric surfactants, and the like, and one or more of these can be added. Further, the content of the surfactant (penetrating agent) that may be added is preferably 0.2 to 2% by mass relative to the total mass of the ink composition.

  In the present invention, as described above, the dye ink composition contains a dye, and if necessary, contains a moisturizing agent and a penetrating agent, and further contains water as a balance. As water, it is preferable to use ion-exchanged water, ultrafiltered water, reverse osmosis water, pure water such as distilled water, or ultrapure water. In particular, water obtained by sterilizing these waters by ultraviolet irradiation or addition of hydrogen peroxide is preferable because generation of mold and bacteria is prevented for a long period of time.

  In the present invention, the dye ink composition may further include an antifungal agent, an antiseptic agent, an antioxidant, an ultraviolet absorber, a chelating agent, an oxygen absorber, a pH adjuster (for example, triethanolamine), if necessary. Alternatively, one or more of various additives that can be usually used in an ink composition for ink jet textile printing, such as a solubilizing agent, can be contained.

  The dye ink composition used in the present invention may be prepared by supplying the above-described components to a dispersing / mixing machine (for example, a ball mill, a sand mill, an attritor, a basket mill, a roll mill, etc.) and dispersing them. According to a preferred embodiment of the present invention, it is preferable to filter the ink stock solution obtained by the above-described dispersing / mixing device using a filter such as a membrane filter or a mesh filter to remove coarse particles.

  Such a dye ink composition preferably has a surface tension of 25 to 40 mN / m, preferably 28 to 35 mN / m, from the viewpoint of the balance between the printing quality and the reliability as an ink composition for ink jet textile printing. More preferably. From the same viewpoint, the viscosity of the ink composition according to the present invention at 20 ° C. is preferably 1.5 to 10 mPa · s, and more preferably 2 to 8 mPa · s. In order to make the surface tension and viscosity within the above ranges, a method for adjusting the concentration of the dye, a means for adjusting the type and amount of the humectant, and the like can be used.

  Examples of the cloth suitably used in the inkjet printing method according to the present invention include a cloth made of polyamide fiber, silk or wool (for example, a woven fabric, a net, or a non-woven fabric).

  Ink jet printing is performed by filling an ink cartridge of an ink jet printer with an ink composition and ejecting ink droplets from a printer head onto a fabric. The inkjet printer is not particularly limited, but a drop-on-demand inkjet printer is preferable. The drop-on-demand ink jet printer employs a piezoelectric element recording method in which recording is performed using a piezoelectric element disposed on a recording head, and heat energy generated by a heater of a heating resistance element disposed on the recording head. There is a method that employs a thermal jet recording method that performs recording using a recording medium, and any recording method can be employed.

<Pretreatment process>
In the inkjet printing method according to the present invention, the fabric may be pretreated in advance before the above-described fabric back surface treatment step and the inkjet printing step. For the pretreatment of the fabric, a known pretreatment agent can be used, and the pretreatment agent generally contains a paste, a pH adjuster, and a hydrotropic agent, and may optionally contain silica.

  Examples of the paste include natural gums such as guar and locust bean, starches, seaweeds such as sodium alginate and fungi, plant skins such as pectic acid, methyl fibrin, ethyl fibrin, hydroxyethylcellulose, carboxymethylcellulose, etc. Fibrin derivatives, roasted starch, alpha starch, carboxymethyl starch, carboxyethyl starch, hydroxyethyl starch and other modified starches, processed natural gums such as roast bean gum, roast bean gum, algin derivatives, or polyvinyl alcohol, Synthetic pastes such as polyacrylates, emulsions, and the like are used.

  Moreover, as a pH adjuster, an acid ammonium salt, for example, ammonium sulfate and ammonium tartrate are desirable. Further, examples of the hydrotropic agent include alkylureas such as urea, dimethylurea, thiourea, monomethylthiourea, and dimethylthiourea.

<Post-processing process>
In the ink jet printing method according to the present invention, it is preferable to carry out the dye fixing process after performing the ink jet printing process. In the dye fixing treatment, for example, a fixing operation can be performed using a known steamer (manufactured by Matisse; Steamer DHe type). Specifically, for example, the steaming process is performed for 30 minutes under a highly humidified condition at a temperature of 102 ° C.

  Thereafter, a washing operation is performed. Specifically, after scouring the fabric with tap water, a nonionic soaping agent is added to warm water of about 50 ° C. and soaked for about 15 minutes with occasional stirring. The bath ratio (printing cloth weight / bath weight) is preferably 1/50. In addition, wash your hands with tap water in the cleaning solution. After thoroughly washing with water, the fabric can be dried and ironed to obtain a printed fabric.

<Printer head>
Ink-jet printing can be applied to any ink-jet method such as a thermal method, a continuous method, or a piezo method, but a piezo vibrator method is preferable.

  When the ink jet ink composition for textile printing is filled into a piezo vibrator type ink jet print head and ejected, it is desirable that the surface of the nozzle plate of the print head is subjected to ink repellent treatment. By applying the ink repellent treatment, it is difficult for the ink to be bent, and a desired image with excellent reproducibility can be printed on the fabric. This flight bending prevention effect can be remarkably improved by adding alkylene glycol-mono-alkyl ether or 1,2-hexanediol to the above-described ink composition for textile printing.

  The ink repellent treatment is also preferably performed on the inner surface of the nozzle hole. By applying to the inner surface, the ink meniscus position is stabilized, and the ejection stability is further improved. Moreover, it becomes difficult for ink to come out on the nozzle plate surface, and the ink repellency on the nozzle surface can be maintained for a longer time.

  The nozzle plate can be provided with holes having a desired diameter. Examples of the constituent material of the nozzle plate include metals, ceramics, silicon, glass, plastics, etc., preferably a single material such as titanium, chromium, iron, cobalt, nickel, copper, zinc, tin, or gold. Or alloys such as nickel-phosphorus alloy, tin-copper-phosphorus alloy, copper-zinc alloy, stainless steel, polycarbonate, polysulfone, acrylonitrile-butadiene-styrene copolymer, polyethylene terephthalate, polysulfone, or various photosensitive materials. It is desirable that it is made of a functional resin.

  The method for ink repellent treatment of the surface of these materials is not particularly limited. For example, the surface of the material is immersed in an electrolytic solution in which nickel ions and water-repellent polymer resin particles are dispersed by electric charge, and the electrolytic solution is immersed while stirring. A method of eutectoid plating on the surface of the nozzle plate is preferred. As the water-repellent polymer resin material used for this eutectoid plating, resins such as polytetrafluoroethylene, polyperfluoroalkoxybutadiene, polyfluorovinylidene, polyfluorovinyl, or polydiperfluoroalkyl fumarate are used alone or in combination. It is suitable to use. Moreover, it is not necessary to limit to nickel as a metal material, For example, copper, silver, tin, zinc, etc. can be selected suitably. Preferably, a material having a large surface hardness and excellent wear resistance, such as nickel, a nickel-cobalt alloy, or a nickel-boron alloy, is suitable.

  EXAMPLES Hereinafter, the present invention will be specifically described by way of examples, but these do not limit the scope of the present invention.

<Preparation of liquid composition>
According to the composition shown in Table 1 below, each component was mixed to prepare liquid compositions A and B. The surface tension of the prepared liquid composition was measured using an automatic dynamic surface tension meter CBVP-Z (manufactured by Kyowa Interface Science Co., Ltd.). Table 1 also shows the value of the surface tension of each liquid composition. In Table 1, TEG-m-BE represents triethylene glycol monobryl ether, and Proxel XL2 represents a fungicide (preservative) manufactured by ICI.

<Preparation of ink composition>
Each component was mixed according to Table 2 below to prepare a four-color ink composition. In Table 2, TEG-m-BE and Proxel XL2 represent the same as in Table 1, and EDTA represents disodium ethylenediaminetetraacetate.

<Inkjet printing>
On the back of the silk fabric (the surface opposite to the surface to be printed), the above-described liquid composition B was solid-printed at a resolution of 720 dpi using an inkjet printer (PX-G920, manufactured by Seiko Epson Corporation). After that, the fabric is turned over and supplied to the same ink jet printer, and the above-mentioned liquid composition A is solid-printed at a resolution of 720 dpi on the surface (printing surface) of the fabric, and then the liquid composition is applied to the fabric. Solid printing was performed at a resolution of 720 dpi using black ink on the portion where the product A was adhered.

  Also, in the above, instead of the black ink solid printing, each color ink of cyan, magenta, yellow, and black is used to form characters and white characters (characters are formed on the image solidly printed with each color ink. Printed).

  Further, for comparison, solid ink printing and printing using each color ink were performed in the same manner as described above except that the liquid compositions A and B were replaced.

  In addition, for comparison, without performing the treatment of the fabric with the liquid compositions A and B, printing was performed directly on the fabric using the black ink solid printing and each color ink.

  The printed fabric was steamed and fixed at 105 ° C. for 30 minutes using a steamer (Steamer DHe, manufactured by Matisse), and then Olphin E1010 (manufactured by Nisshin Chemical Co., Ltd.), Lucal STA (Meisei Chemical Co., Ltd.) (Made) Washed for 10 minutes at 55 ° C. using a 0.2% aqueous solution and dried to obtain a dyeing concentration test piece.

<Dyeing density difference evaluation between fabric front and back>
For a solid printed fabric using black ink, using a Gretag densitometer (manufactured by Gretag Maxes Co.), measure the OD value of the front and back of the portion printed on the black solid portion of the fabric, and the OD of the surface (printed surface) The difference (Δ) between the value and the OD value of the back surface (non-printed surface) was calculated. The evaluation results were as shown in Table 3 below.

<Evaluation of bleeding>
With respect to the fabric printed with black ink, the edge portion of the printing surface was visually observed to evaluate the black bleeding property. The evaluation criteria were as follows.
○: No blurring △: Slight blurring ×: Severe bleeding

Moreover, the degree of mixed color bleeding was evaluated for the fabrics on which characters and white characters were printed using each color ink. The evaluation criteria were as follows.
◯: No bleeding is observed Δ: Slight bleeding is observed X: Vigorous bleeding is observed The evaluation results of the bleeding property are as shown in Table 3 below.

Claims (7)

An ink-jet printing method for printing an ink composition containing a dye on a fabric by an ink-jet method,
On one surface of the fabric, the fabric back surface treatment step of Ru is deposited a first liquid composition,
The opposite side from said first surface where the liquid composition is deposited in the fabric, the fabric surface treatment step of depositing a second liquid composition,
After the fabric rear surface treatment and fabric surface treatment, the second surface where the liquid composition is deposited in the fabric, and inkjet impress printing step of discharging the ink composition,
Comprising
The surface tension of the first liquid composition is 28.0 to 30.0 mN / m,
The surface tension of said 2nd liquid composition is 30.0-35.0 mN / m , The inkjet textile printing method characterized by the above-mentioned. During the first liquid composition deposited on the fabric and said second liquid composition is left on the fabric, implementing the inkjet impress printing process, ink-jet printing process according to claim 1. The first liquid composition and / or the second liquid composition, comprising also included in the ink composition, ink-jet printing process according to claim 1 or 2. The inkjet printing method according to any one of claims 1 to 3 , wherein the dye is an acid dye. The inkjet textile printing method as described in any one of Claims 1-4 with which the said fabric back surface treatment process and / or the said fabric surface treatment process are implemented by the inkjet system which discharges the said liquid composition with respect to the said fabric. . Filled with said first liquid composition and the second liquid composition and the ink composition in the same ink cartridge, the ink jet method, the fabric back surface treatment step, the fabric surface treatment step and the inkjet impress printing The inkjet printing method according to claim 5 , wherein the step is performed. The inkjet printing method, silk, performed on the fabric made of wool or polyamide fibers, ink-jet printing method according to any one of claims 1-6.