JP2010084289A - Inkjet textile printing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inkjet textile printing method which does not require a steam treatment (steaming) and water washing, which have been necessary for conventional inkjet textile printing methods. <P>SOLUTION: Disclosed is an inkjet textile printing method using an aqueous ink, which is characterized by comprising an ejection step wherein the aqueous ink is ejected onto a fabric medium by inkjet, and a microwave irradiation step wherein the fabric medium on which the aqueous ink is ejected is irradiated with a microwave. The inkjet textile printing method is also characterized in that an aqueous ink containing water, an anionic dye containing an acidic dye or a reactive die, a polyhydric alcohol and a compound having an activity of accelerating fixation of a coloring material to the fabric medium when the fabric medium on which the aqueous ink is ejected is irradiated with a microwave, is used as the aqueous ink. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an ink jet textile printing method using an ink composition for ink jet textile printing.

Ink jet printing is a method in which droplets of ink are ejected and adhered to a printing medium.
The ink jet printing method in which this ink jet printing method is applied to textile printing is a method in which ink droplets are applied to various fiber media (natural fiber or synthetic fiber cloth, etc.) that have been pretreated (natural fiber or pretreatment is essential). Since the ink is ejected and ejected, and the ink is adhered, various images excellent in gradation and multicolor expression can be easily formed on the fiber medium (see, for example, Patent Document 1).

  As inks used in the ink jet system, inks obtained by dissolving various water-soluble dyes in water are known. And as a water-soluble dye, a direct dye, an acid dye, a reactive dye, etc. are used (for example, refer patent document 2).

By the way, in the ink-jet printing method, after ink-jet printing on various fiber media (natural or synthetic fiber cloth, etc.), as post-processing, steam treatment (steaming treatment) for fixing and coloring of colorant, and washing with water It was necessary to perform processing and the like (for example, see Patent Documents 1 and 2).
An apparatus for performing steam treatment (steaming treatment), water washing treatment, and the like requires an installation space similar to that of a large-sized inkjet printing apparatus, and the apparatus price is also expensive.
Further, in the conventional method, it is necessary to perform sufficient dyeing by discharging a large amount of ink onto the fiber medium, and dyeing by washing away excess dye. Accordingly, it was inevitable that colored wastewater was discharged when washed with water. Further, if the ejection of a large amount of ink onto the fiber medium is stopped and the amount of ink ejected onto the fiber medium is relatively reduced, sufficient dyeing becomes difficult.
JP 2007-119657 A JP 2005-213484 A

  SUMMARY OF THE INVENTION An object of the present invention is to provide an ink-jet printing method that does not require steam treatment (steaming treatment) and water-washing treatment, which are conventionally essential in ink-jet textile printing methods.

The present inventor has found that the above object can be achieved by the interaction between the fiber medium, the microwave irradiation, and the ink composition through intensive research, and has reached the present invention.
Further, the present inventor includes a compound having an action of accelerating the fixing of the colorant to the fiber medium when the fiber medium from which the water-based ink is discharged is irradiated with microwaves. The inventors have found that the above object can be effectively achieved, and have arrived at the present invention.
In addition, the present inventor is a compound capable of releasing (generating) a compound having an action of promoting the fixing of a colorant to a fiber medium when the fiber medium on which the aqueous ink is discharged is irradiated with microwaves. It was found that the above-mentioned object can be effectively achieved by preliminarily adhering to the fiber medium by pretreatment (for example, coating), and the present invention has been achieved.
In addition, when the fiber medium is a natural fiber, a synthetic fiber having a cationic group, or a semi-synthetic fiber, the inventor effectively achieves the above object by the interaction between the fiber medium, microwave irradiation, and the ink composition. I found it achievable.
Here, as a compound having an action of promoting the fixing of the colorant to the fiber medium when the fiber medium on which the aqueous ink is discharged is irradiated with microwaves, a compound capable of releasing ammonia, particularly urea and the like. And water-soluble compounds containing the derivatives.
Furthermore, the present inventor has clarified that moisture and urea are greatly related when a water-based ink is fixed to a fiber medium by microwave treatment. And it was clarified that the use of urea promotes the fixing of the dye to such an extent that colored wastewater does not come out even when washed with water.

The present invention has the following configuration.
(Configuration 1)
An inkjet printing method using a water-based ink,
A discharge step of discharging the water-based ink onto a fiber medium by an inkjet method;
A microwave irradiation step of irradiating the fiber medium on which the water-based ink has been discharged with microwaves, and
As the water-based ink,
Water, an anionic dye containing an acid dye or reactive dye, a polyhydric alcohol,
A compound having an action of accelerating fixing of the colorant to the fiber medium when the fiber medium from which the ink is discharged is irradiated with microwaves;
An ink-jet printing method comprising using a water-based ink containing
(Configuration 2)
An inkjet printing method using a water-based ink,
A discharge step of discharging the water-based ink onto a fiber medium by an inkjet method;
A microwave irradiation step of irradiating the fiber medium on which the water-based ink has been discharged with microwaves, and
As the water-based ink,
A water-based ink containing water, an anionic dye containing an acid dye or a reactive dye, and a polyhydric alcohol; and
A compound capable of releasing a compound having an action of promoting the fixing of the colorant to the fiber medium when the fiber medium on which the ink is ejected is irradiated with microwaves is previously attached to the fiber medium by pretreatment. Leave,
An inkjet printing method characterized by the above.
(Configuration 3)
A structure having a function of promoting fixing of a colorant to the fiber medium when the fiber medium from which the ink has been ejected is irradiated with microwaves is a compound capable of releasing ammonia. 3. The inkjet printing method according to 1 or 2.
(Configuration 4)
4. The inkjet printing method according to Configuration 3, wherein the compound capable of releasing ammonia is a compound containing urea or a derivative thereof.
(Configuration 5)
The ink-jet printing method according to any one of Structures 2 to 4, wherein the fiber medium is a fiber medium having cotton or a cationic group.
(Configuration 6)
The ink-jet printing method according to any one of Structures 1 to 4, wherein the fiber medium is a natural fiber, or a synthetic fiber or semi-synthetic fiber fiber medium having a cationic group.

  ADVANTAGE OF THE INVENTION According to this invention, the inkjet textile printing method which does not require the steam process (steaming process) and the water washing process which were conventionally essential in the inkjet textile printing method can be provided.

Hereinafter, the present invention will be described in detail.
The inkjet textile printing method of the present invention is
An inkjet printing method using a water-based ink,
A discharge step of discharging the water-based ink onto a fiber medium by an inkjet method;
A microwave irradiation step of irradiating the fiber medium on which the water-based ink has been discharged with microwaves, and
As the water-based ink,
Water, an anionic dye containing an acid dye or reactive dye, a polyhydric alcohol,
A compound having an action of accelerating fixing of the colorant to the fiber medium when the fiber medium from which the ink is discharged is irradiated with microwaves;
(Structure 1) characterized in that a water-based ink containing is used.
According to the first aspect of the invention, it is possible to provide an ink jet printing method that does not require steam treatment (steaming treatment) and water washing treatment, which are conventionally essential in the ink jet textile printing method.
In the invention according to the configuration 1, the interaction between the fiber medium, the microwave irradiation, and the ink composition exerts the action of promoting the fixing of the colorant to the fiber medium by the microwave irradiation. Is obtained.
In the invention according to Configuration 1, when the microwave medium is irradiated to the fiber medium from which the ink has been ejected (when the microwave is irradiated or during the microwave irradiation), the fiber medium is moved to the fiber medium. The compound having the effect of promoting the fixing of the colorant needs to be a compound having substantially the effect of promoting the fixing of the colorant to the fiber medium. There is substantially no action of promoting the fixing of the colorant to the fiber medium. If this action is insufficient, the colored waste water cannot be reduced, and the water washing treatment cannot be made unnecessary.
In the invention according to Configuration 1, as a compound having an action of promoting the fixing of the colorant to the fiber medium when the fiber medium from which the ink has been ejected is irradiated with microwaves, cotton, silk, or the like can be used. A compound capable of realizing a print quality equivalent to or higher than that of ink jet printing is preferable.
In the invention according to the above-described configuration 1, when the “action for promoting the fixing of the colorant to the fiber medium” exhibited by the interaction between the fiber medium, the microwave irradiation, and the ink composition is very large, a water washing treatment is performed. Even colored drainage does not come out. That is, the colorant in the ink ejected to the fiber medium is almost completely fixed to the fiber medium.
In the invention according to the above-described configuration 1, when the fiber medium on which the ink has been ejected is irradiated with microwaves, the compound having the action of promoting the fixing of the colorant to the fiber medium does not require a water washing treatment. A compound capable of realizing this is preferable.
In the invention according to Configuration 1, the fiber medium is preferably a natural fiber or a synthetic fiber or a semi-synthetic fiber having a cationic group (Configuration 6).

The inkjet textile printing method of the present invention is
An inkjet printing method using a water-based ink,
A discharge step of discharging the water-based ink onto a fiber medium by an inkjet method;
A microwave irradiation step of irradiating the fiber medium on which the water-based ink has been discharged with microwaves, and
As the water-based ink,
A water-based ink containing water, an anionic dye containing an acid dye or a reactive dye, and a polyhydric alcohol; and
A compound capable of releasing a compound having an action of promoting the fixing of the colorant to the fiber medium when the fiber medium on which the ink is ejected is irradiated with microwaves is previously attached to the fiber medium by pretreatment. Leave,
(Configuration 2).
According to the second aspect of the present invention, it is possible to provide an ink jet textile printing method that does not require steam treatment (steaming treatment) and water washing treatment, which are conventionally essential in the ink jet textile printing method.
In the invention according to the configuration 1, the action of promoting the fixation of the colorant to the fiber medium by the microwave irradiation by the interaction between the fiber medium that has been subjected to the predetermined pretreatment, the microwave irradiation, and the ink composition. The above-described effects are obtained.
In the invention according to Configuration 2, when the microwave medium is irradiated to the fiber medium from which the ink has been ejected (when the microwave is irradiated or during the microwave irradiation), the fiber medium is moved to the fiber medium. The compound capable of releasing a compound having the action of promoting the fixing of the colorant should be a compound capable of sufficiently releasing the compound having a function of promoting the fixing of the colorant to the fiber medium. It is. If the compound having substantially the effect of promoting the fixing of the colorant to the fiber medium is not sufficiently released, the colored waste water cannot be reduced, and the water washing treatment cannot be made unnecessary.
In the invention according to Configuration 2, as a compound capable of releasing a compound having an action of accelerating fixing of a colorant to a fiber medium when the fiber medium on which ink is ejected is irradiated with microwaves, cotton is used as the compound. It is preferably a compound that can realize a printing quality equivalent to or equivalent to or higher than that of inkjet printing on silk or silk.
In the invention according to the above-described configuration 2, “the action of promoting the fixing of the colorant to the fiber medium” exhibited by the interaction between the fiber medium that has been subjected to the predetermined pretreatment in advance, the microwave irradiation and the ink composition is extremely If it is too large, colored wastewater does not come out even if it is washed with water. That is, the colorant in the ink ejected to the fiber medium is almost completely fixed to the fiber medium.
In the invention according to Configuration 2, the compound capable of releasing a compound having an action of promoting fixing of the colorant to the fiber medium when the fiber medium on which the ink has been ejected is irradiated with microwaves is washed with water. It is preferable that the compound can realize that the treatment is unnecessary.
In the invention according to Configuration 2, it is preferable that the fiber medium subjected to the predetermined pretreatment in advance is a natural fiber or a synthetic fiber having cotton or a cationic group (Configuration 5).

In the inkjet textile printing method of the present invention, when the fiber medium on which the ink has been ejected is irradiated with microwaves, the compound having an action of promoting the fixing of the colorant to the fiber medium is a compound capable of releasing ammonia. (Configuration 3).
According to the invention according to Configuration 3, the following operational effects are obtained.
(1) When an ammonia-releasing compound, particularly a water-soluble compound containing urea and its derivatives, is added to an ink composition for ink jet textile printing, the interaction between a predetermined fiber medium, microwave irradiation, and ink composition causes a micro The effect of promoting the fixation of the colorant to the fiber medium by wave irradiation is demonstrated, and the fixing strength of the colorant to the fiber medium compared to the case without microwave irradiation or the case without containing a compound capable of releasing ammonia. And the color development becomes deeper as the amount of the colorant fixed on the fiber medium increases.
(2) A compound capable of releasing ammonia (for example, a water-soluble compound containing urea and its derivatives) is preliminarily adhered to the fiber medium by pretreatment when the fiber medium on which the ink has been ejected is irradiated with microwaves. By having the predetermined fiber medium, microwave irradiation and the ink composition interact, the action of promoting the fixing of the colorant to the fiber medium by microwave irradiation is exerted, compared with the case without microwave irradiation, Alternatively, as compared with a case where a compound capable of releasing ammonia is not adhered, the fixing strength of the colorant to the fiber medium increases, and the color development becomes deep due to an increase in the fixing amount of the colorant to the fiber medium.
(3) By the interaction between the fiber medium, microwave irradiation, and ink composition, compared with the case where microwave irradiation is not performed or a compound capable of releasing ammonia is not used, or a conventional method (for example, Patent Documents 1 and 2 described above) Even when the amount of ink is relatively small, that is, when the amount of colorant contained in the unit area of the fiber medium is relatively small, the fiber medium is It is possible to fix all of the colorant in the ejected ink to the fiber medium. By this action, compared with the case where no microwave irradiation or a compound capable of releasing ammonia is used, or compared with the case where a conventional method is used, the colorant having the same or equivalent color with a relatively small amount of ink is used. Fixing and color development by it are possible.
In the present invention, the colorant in the ink discharged onto the fiber medium can be almost completely fixed to the fiber medium. Thereby, even if it rinses with water, a colored waste_water | drain does not come out.
(4) Based on the results of the above (1) to (3), the vapor treatment (steaming treatment) for fixing the colorant and coloring is unnecessary.
(5) It is epoch-making because colored wastewater does not come out even when washed with water. In the present invention, washing with water is unnecessary.

In the present invention, the compound capable of releasing ammonia is preferably a compound that releases ammonia when the micro wave is irradiated.
This is because the above-described operational effects (1) to (5) are greatly exhibited.
Examples of compounds capable of releasing ammonia include urea and urea derivatives (compounds having a carbamide group).

In the present invention, the ammonia-releasing compound is preferably urea or a urea derivative (compound having a carbamide group) (Configuration 4).
This is because the above-described operational effects (1) to (5) are exhibited more greatly.

Examples of urea or a urea derivative (a compound having a carbamide group) include alkylureas such as urea, dimethylurea, monomethylthiourea, thiourea, and dimethylthiourea, and alkylthioureas. Among these, compounds having high ammonia release amount and ammonia release efficiency such as urea are preferable.
The content of urea or a urea derivative (a compound having a carbamide group) is not particularly limited, but is preferably 1 to 30% by weight, more preferably 5 to 20% by weight, based on the total weight of the ink composition. It is.

  In the invention according to Configuration 2, the above-described ammonia-releasing compound (for example, a water-soluble compound containing urea and a derivative thereof) when the microwave medium is irradiated to the fiber medium from which the ink has been discharged It is made to adhere to a fiber medium by pretreatment (Configuration 3 and Configuration 4).

  The ink composition for ink jet textile printing used in the invention according to Configuration 1 contains the above-described ammonia-releasing compound (for example, a water-soluble compound containing urea and its derivatives) (Configuration 3 and Configuration 4).

The ink composition for inkjet textile printing used in the present invention contains a polyhydric alcohol solvent (Configurations 1 and 2).
Is it expected to have an effect of assisting the above-described effects (1) to (5)? Because.
In addition, it is preferable to contain a water-soluble solvent such as a polyhydric alcohol solvent because the solvent odor is less than that of the solvent ink.

As the polyhydric alcohol, for example, a polyhydric alcohol having a boiling point of 150 ° C. or higher at normal pressure is preferably used. Ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol, Polyethylene glycol having a molecular weight of 2000 or less, 1,3-propylene glycol, isopropylene glycol, isobutylene glycol, 1,4-butanediol, 1,3-butanediol, 1,2-pentanediol, 1,5-pentanediol, 1 , 2-hexanediol, 1,6-hexanediol, 1,2,6-hexanetriol, 1,8-octanediol, 1,2-octanediol, mesoerythritol, pentaerythritol Such as thioglycolic can be mentioned. Among the polyhydric alcohols, ethylene glycol polyhydric alcohols such as ethylene glycol, diethylene glycol, triethylene glycol, and tetraethylene glycol are particularly preferable.
The content of the polyhydric alcohol is not particularly limited, but is preferably 1 to 40% by weight, more preferably 3 to 20% by weight, based on the total weight of the ink composition.

In the ink composition used in the present invention, any water can be used as the water, but pure water is preferably used. Pure water can be easily produced by ion exchange or distillation.
Moreover, it is preferable to sterilize pure water with ultraviolet rays or the like.
The content of water is not particularly limited, but is preferably 5 to 70% with respect to the total weight of the ink composition from the viewpoint of assisting the achievement of the above-described effects (1) to (5). %, More preferably 10 to 60% by weight.

  The ink composition used in the present invention preferably contains a water-soluble binder. This is because an effect of assisting the exertion of the above-described effects (1) to (5) is expected.

The ink composition used in the present invention preferably contains at least one selected from a phenol resin, a urethane resin, and an acrylic resin as a water-soluble binder.
This is because the above-described operational effects (1) to (5) are exhibited more greatly.

The ink composition used in the present invention is a water-based ink containing a water-soluble colorant.
In the ink composition used in the present invention, as the anionic dye containing an acidic dye or reactive dye, an anionic dye containing a known acidic dye or reactive dye can be used.
An anionic dye is a general term for dye ions having an anionic property, and many dye molecules contain polar groups having anionic properties such as “sulfonic acid group” and “carboxylic acid group”. As the anionic dye, an acid dye or a reactive dye is preferable.
The acidic dye contains acidic groups such as “sulfonic acid group” and “carboxylic acid group” in the dye molecule. Examples of the acid dye include Acid Blue 9.
As for the reactive dye, the colorant is fixed by the reaction between the fiber and the dye. An example of a reactive dye is Reactive Red 24.

  The ink composition used in the present invention, as another additive, is an alkylene glycol monoalkyl ether (for example, triethylene glycol monoalkyl ether) for the purpose of improving ink ejection stability (particularly, ejection stability with a piezo head). -N-butyl ether) and / or a surfactant (for example, an acetylene glycol surfactant).

  In addition, the ink composition used in the present invention preferably contains a preservative in addition to the above components. Preferable antiseptics include, for example, proxel CRL, proxel BDN, proxel GXL, proxel XL-2, proxel IB, or proxel TN.

  Furthermore, the ink composition used in the present invention can contain a chelating agent (metal sequestering agent). The chelating agent traps the metal in the ink and improves the reliability of the ink, and also traps the heavy metal on the fiber medium and is effective in preventing dyeing spots. As the chelating agent, ethylenediaminetetraacetate, nitrilotriacetate, hexametaphosphate, pyrophosphate, or metaphosphate is preferable. In addition, TRILON TA, DEKOL SN, and Calgon T commercially available from Benkies, which are commercially available from BASF, are excellent in biodegradability and are suitable for the environment.

  In the present invention, the fiber medium is a medium composed of fibers. Examples of the fiber medium include a cloth, a cloth material, a woven cloth, a blended woven cloth, a cloth (a cloth), and a non-woven cloth.

The ink-jet printing method of the present invention is particularly suitable as an ink-jet printing method for performing ink-jet printing on a fiber medium such as a natural fiber, a synthetic fiber having a cationic group, or a semi-synthetic fiber (Configuration 6).
This is because the above-described operational effects (1) to (5) are more greatly exhibited by the interaction between the predetermined fiber medium, microwave irradiation, and ink composition.
Here, examples of natural fibers include hemp and wool.
Examples of natural fibers or synthetic fibers having a cationic group include silk, nylon, and polyurethane.
Examples of semisynthetic fibers include acetate fibers.

In the present invention, microwaves are applied to the fiber medium on which the ink has been ejected.
Here, at the time of microwave irradiation, the frequency and irradiation intensity of the microwave are adjusted so that the above-described effects (1) to (5) due to the microwave irradiation are preferably maximized. .

  Hereinafter, an ink jet printer suitable for carrying out the present invention will be described with reference to the drawings. FIG. 1 shows an example of the configuration of an inkjet printer 10 suitable for implementing the present invention. The inkjet printer 10 is an inkjet printer that uses water-based ink, and includes an inkjet head 12, a platen 14, a plurality of rollers 16 a to 16 d, and a microwave irradiation unit 18.

  The inkjet head 12 is a print head that discharges aqueous ink to the medium 50. The inkjet head 12 ejects water-based ink to each position on the medium 50 by moving relative to the medium 50 in a predetermined main scanning direction and sub-scanning direction.

  The platen 14 is a table that holds the medium 50 on which the water-based ink is ejected by the inkjet head 12 on the upper surface. The plurality of rollers 16 a to 16 d are rollers that convey the medium 50. The plurality of rollers 16 a to 16 d convey the medium 50 to move the inkjet head 12 relative to the medium 50 in the sub-scanning direction.

  The microwave irradiation unit 18 is provided on the downstream side of the inkjet head 12 in the conveyance direction of the medium 50, and irradiates the medium 50 on which the aqueous ink is discharged with microwaves. In this example, the microwave irradiation unit 18 irradiates the medium 50 with microwaves while allowing the medium 50 to pass inside a casing covered with a wire mesh, for example. Thereby, the microwave irradiation unit 18 fixes the aqueous ink ejected by the inkjet head 12 to the medium 50.

  Here, the microwave is, for example, an electromagnetic wave having a frequency of 300 MHz to 30 GHz (a wavelength of 1 cm to 1 m). A microwave irradiation part irradiates the microwave of 1-4 GHz by the frequency, for example, More preferably, it is 2-4 GHz. Moreover, the microwave irradiation part 18 irradiates the microwave of the intensity | strength comparable as a household microwave oven, for example.

  Moreover, the microwave irradiation part 18 may irradiate a microwave, for example, performing ventilation with respect to the medium 50. FIG. If comprised in this way, water-based ink can be fixed faster, for example. It can also be combined with various heaters.

Examples will be described below.
Example 1
Printing according to Example 1 was performed using an inkjet printer manufactured by Mimaki Engineering Co., Ltd. as the inkjet printer 10. The model number of the ink jet printer used in Example 1 is TX2-1600. However, as the microwave irradiation unit 18, a microwave oven for home use was used instead of the microwave generator provided in the main body of the inkjet printer 10.

In Example 1, an aqueous ink having the following composition was used.
1) Coloring agent: Acid Blue 9; 5% by weight
2) Urea; 15% by weight
3) Polyhydric alcohol solvent: glycerin; 5% by weight, DEG; 10% by weight
4) Water-soluble binder: Joncrill 61; 3% by weight
5) Other: Name Proxel XL2; 0.1% by weight
6) Remainder: Water The ink was prepared through a normal procedure (step).
As the medium 50, a white silk cloth was used.

  Using the aqueous ink (ink composition) prepared above, printing according to Example 1 was performed. In this printing, after water-based ink was discharged at a printing density of 100% by the inkjet printer 10, microwave irradiation was performed on the medium 50 for 2 minutes using a microwave oven. The output of the microwave oven was 600W.

(Comparative Examples 1 and 2)
A water-based ink manufactured by Mimaki Engineering Co., Ltd. was used. The model number of the water-based ink used is SPC-0355. As the medium 50, a white silk cloth was used.
The above white cloth was printed by the ink jet printer 10. The dyed product at this stage was referred to as Comparative Example 1.
Then, after drying at 80 degrees, it was kept in superheated steam at 170 degrees for 7 minutes, washed with water, reduced and washed with water and dried. The dyed product at this stage was referred to as Comparative Example 2.
In Comparative Examples 1 and 2, the difference due to the presence or absence of microwave irradiation was examined, but no clear difference was confirmed for the dyed products obtained in Comparative Examples 1 and 2, respectively.

(Evaluation)
(1) The color fading evaluation by washing with water was performed on the dyed product obtained above.
The dyed product obtained in Example 1 showed no colored wastewater even when washed with water.
The dyed products obtained in Comparative Examples 1 and 2 produced a large amount of colored wastewater when washed with water.
(2) Visual evaluation was performed on the dyed product obtained above.
The dyeing obtained in Example 1 was a beautiful dyeing without bleeding. The dyed product obtained in Example 1 was extremely excellent in saturation and color strength (color barrier) and was equivalent to Comparative Example 2.
(3) The dyed product obtained above was evaluated using a colorimeter. In this evaluation, in Example 1 and Comparative Example 2, printing of each color of C, M, and Y with one color ink and printing of each color of Y + M and M + C with two colors of ink were performed.
After printing, the colorimeter measured the values of L * (Elster), a * (Aster), and b * (Biester) in the CIE chromaticity diagram for the printing results of each color. Here, L * is lightness, and a * b * is a unit of chromaticity representing hue and saturation. As a colorimeter, a spectrocolorimetric densitometer X-RITE 530LP (model: 530LP) manufactured by X-Rite (USA) was used. These results are shown in Table 1.

  As mentioned above, although this invention was demonstrated using the Example, the technical scope of this invention is not limited to the range as described in the said Example. It will be apparent to those skilled in the art that various modifications and improvements can be made to the above-described embodiments. It is apparent from the description of the scope of claims that embodiments with such changes or improvements can be included in the technical scope of the present invention.

  The present invention can be suitably used for an inkjet printer, for example.

1 is a diagram illustrating an example of a configuration of an inkjet printer 10 according to an embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Inkjet printer, 12 ... Inkjet head, 14 ... Platen, 16 ... Roller, 18 ... Microwave irradiation part, 50 ... Medium

Claims (6)

An inkjet printing method using a water-based ink,
A discharge step of discharging the water-based ink onto a fiber medium by an inkjet method;
A microwave irradiation step of irradiating the fiber medium on which the water-based ink has been discharged with microwaves, and
As the water-based ink,
Water, an anionic dye containing an acid dye or reactive dye, a polyhydric alcohol,
A compound having an action of accelerating fixing of the colorant to the fiber medium when the fiber medium from which the ink is discharged is irradiated with microwaves;
An ink-jet printing method comprising using a water-based ink containing An inkjet printing method using a water-based ink,
A discharge step of discharging the water-based ink onto a fiber medium by an inkjet method;
A microwave irradiation step of irradiating the fiber medium on which the water-based ink has been discharged with microwaves, and
As the water-based ink,
A water-based ink containing water, an anionic dye containing an acid dye or a reactive dye, and a polyhydric alcohol; and
A compound capable of releasing a compound having an action of promoting the fixing of the colorant to the fiber medium when the fiber medium on which the ink is ejected is irradiated with microwaves is previously attached to the fiber medium by pretreatment. Leave,
An inkjet printing method characterized by the above.   The compound having an action of accelerating fixation of a colorant to the fiber medium when the fiber medium on which the ink is ejected is irradiated with microwaves is a compound capable of releasing ammonia. Item 3. The inkjet printing method according to Item 1 or 2.   The inkjet printing method according to claim 3, wherein the ammonia-releasing compound is a compound containing urea or a derivative thereof.   The ink-jet printing method according to any one of claims 2 to 4, wherein the fiber medium is a fiber medium having cotton or a cationic group.   The ink-jet printing method according to any one of claims 1 to 4, wherein the fiber medium is a natural fiber or a fiber medium of a synthetic fiber or a semi-synthetic fiber having a cationic group.

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