JP6718770B2 - Printing apparatus and printing method - Google Patents

Description

The present invention relates to an apparatus and method for printing an image on a print medium such as cloth.

Conventionally, there has been known an apparatus that forms an image on a print medium such as a cloth using an inkjet printer. In order to enhance the commercial value of a fabric or the like on which an image is formed, it is desired to print so that the image is formed when viewed from either side. In particular, handkerchiefs, scarves, and goodwills are rarely seen from only one side, and it is usual that images matching the front side and the back side are formed.

As a technique for printing so that an image can be visually recognized from both sides, a method of improving the permeation of the dye to permeate the dye to the back side, and a method of printing on both sides of a cloth or the like have been proposed (Patent Document 1). ..

Japanese Patent Laid-Open No. 11-315484

The method for printing one surface described above is simple, but when the cloth or the like is thick, the back surface is more likely to be whitish than the printed surface side. Further, in the method of printing on both sides, bleeding tends to occur as the amount of ink landed increases, and thus it is difficult to print at high speed. In addition, since the fabric is swollen and stretched by the ink, the front and back patterns may be misaligned.

In view of the above background, the present invention has an object to provide a method for performing double-sided printing on a print medium such as a cloth.

The printing apparatus of the present invention ejects a printing mechanism including a transport mechanism for transporting a print medium and a printing ink containing a dye mainly containing an ultraviolet-curable compound that becomes an easily water-soluble resin after ultraviolet curing onto the first surface of the print medium. A first inkjet head, a first ultraviolet light source that emits ultraviolet rays that cure the printing ink ejected from the first inkjet head, and a water-soluble resin after ultraviolet curing that is downstream of the first ultraviolet light source. A second ink jet head for ejecting a printing ink containing a dye having an ultraviolet curable compound as a main component onto the second surface of the print medium, and an ultraviolet ray for curing the printing ink ejected from the second ink jet head. And a second ultraviolet light source that generates

In this way, by using the printing ink containing the dye having the ultraviolet curing compound as a main component, the printing ink ejected onto the print medium is UV-cured, so that the print medium does not swell due to the printing ink and is caused by the expansion and contraction of the print medium. The dimensional change can be suppressed. As a result, when printing on both sides, it is possible to print without shifting the design. Further, since the printing ink becomes an easily water-soluble resin after being cured by ultraviolet rays, the resin can be easily washed off after the dye is dyed on the print medium.

In the printing apparatus of the present invention, the textile printing ink may contain an easily water-soluble mixture composed of a water-soluble sizing agent as a main component. With this configuration, the water-soluble sizing agent can be easily washed off.

In the printing apparatus of the present invention, the evaporation solvent contained in the printing ink may be 20 to 70% by weight. Here, the evaporative solvent is water, a solvent, or the like. With this configuration, the elongation of the print medium due to swelling can be suppressed.

The printing apparatus of the present invention includes an auxiliary agent or a mordant for accelerating a color forming reaction in a portion where the printing ink is ejected by the first inkjet head or a portion where the printing ink is ejected, and the water-soluble resin after ultraviolet curing. A third inkjet head for ejecting an auxiliary ink containing a UV-curable compound as a main component, and a portion for ejecting or ejecting the textile printing ink by the second inkjet head for promoting a color forming reaction. A fourth inkjet head may be provided, which contains an auxiliary agent or a mordant and discharges an auxiliary ink containing a UV-curable compound that becomes an easily water-soluble resin after UV-curing as a main component.

With this configuration, even when the print medium is not previously coated with an auxiliary agent or a mordant, it is possible to perform printing using a printing ink that requires an auxiliary agent or a mordant, such as an acid dye or a reactive dye. it can.

In the printing apparatus of the present invention, the textile printing ink may contain an auxiliary agent or a mordant for promoting a color-forming reaction.

With this configuration, it is possible to perform printing using a printing ink that requires a mordant such as an acid dye or a reactive dye or an auxiliary agent for promoting a color development reaction. Further, an inkjet head that discharges the auxiliary agent or the mordant is unnecessary.

A printing apparatus according to the present invention is arranged on the opposite side of the first inkjet head with the print medium interposed therebetween and on the opposite side of the second inkjet head with the print medium interposed therebetween. And a second heater.

With this configuration, it is possible to suppress the dimensional change due to swelling by evaporating the water contained in the textile printing ink by the heater.

The printing apparatus of the present invention includes a mark position detection unit that detects the positions of marks provided on both sides of the print medium, and the first inkjet head based on the position of the marks detected by the mark position detection unit. And a control unit that adjusts the print position of the second inkjet head.

With this configuration, it is possible to control the first inkjet head and the second inkjet head based on the mark provided in advance so that the symbols on both sides correspond to each other.

In the printing apparatus of the present invention, the transport mechanism transports the print medium in a vertical direction at a position where the printing ink is ejected by the first inkjet head and the second inkjet head, and the transport mechanism transports the print medium in the vertical direction. The ink jet head and the second ink jet head have a width larger than the width in the nozzle row direction of the first ink jet head or the second ink jet head on the opposite side with respect to the print medium and in the transport direction. It may be placed apart.

With this configuration, the printing ink is ejected horizontally to the print medium in both the printing by the first inkjet head and the printing by the second inkjet head, so that the printing ink is ejected under the same conditions on the first surface and the second surface. Can be discharged.

In the printing apparatus of the present invention, the conveyance mechanism includes a reversing mechanism that conveys the print medium in a horizontal direction and reverses the front and back of the print medium between the first inkjet head and the second inkjet head. May be.

With this configuration, the printing ink is ejected from the same direction (from the upper side or the lower side) in both printing by the first inkjet head and the second inkjet head. Therefore, the printing is performed on the first surface and the second surface under the same conditions. Ink can be ejected.

The printing method of the present invention comprises a step of ejecting a printing ink containing a dye mainly composed of an ultraviolet-curing compound which becomes an easily water-soluble resin after ultraviolet curing onto the first surface of the print medium, and the first inkjet head. The step of irradiating the portion where the printing ink is ejected with ultraviolet rays with the step of ejecting the printing ink containing a dye mainly containing an ultraviolet-curing compound which becomes an easily water-soluble resin after ultraviolet curing onto the second surface of the print medium. And a step of irradiating the portion where the textile printing ink is ejected by the second inkjet head with ultraviolet rays.

In this way, by using the printing ink containing the dye having the ultraviolet curing compound as a main component, the printing ink ejected onto the print medium is UV-cured, so that the print medium does not swell due to the printing ink and is caused by the expansion and contraction of the print medium. The dimensional change can be suppressed. As a result, when printing on both sides, it is possible to print without shifting the design. Further, since the printing ink becomes an easily water-soluble resin after being cured by ultraviolet rays, the resin can be easily washed off after the dye is dyed on the print medium.

According to the present invention, double-sided printing can be appropriately performed on a print medium such as a cloth.

FIG. 1 is a schematic diagram showing a printing device according to a first embodiment. It is a schematic diagram which shows the structure of a 1st discharge unit. It is a schematic diagram showing a textile printing apparatus in which a printing apparatus is used. It is a schematic diagram which shows the printing apparatus of 2nd Embodiment. It is the schematic diagram which looked at the printing device of 3rd Embodiment from the top.

Hereinafter, a printing apparatus according to an embodiment of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is a schematic diagram showing the configuration of the printing apparatus 1 according to the first embodiment. The printing device 1 is a printing device that performs double-sided printing on a print medium T such as a cloth using a water-soluble UV curable ink.

The water-soluble UV-curable ink is a printing ink containing a dye whose main component is an ultraviolet-curable compound which becomes an easily water-soluble resin after ultraviolet curing, and also contains an easily water-soluble mixture composed of a water-soluble paste as a main component. As the water-soluble paste, for example, soluble starch, sodium alginate, CMC, PVA, acrylic acid partial saponification product, maleic acid copolymer and the like can be used. The evaporative solvent contained in the water-soluble UV-curable ink is 20 to 70% by weight, and the water content in the evaporative solvent of the water-soluble UV-curable ink is 50% by weight or less, preferably 40% by weight or less, It is more preferably 30% by weight or less. More preferably, the water soluble UV curable ink is moisture free.

FIG. 3 is a schematic diagram showing the configuration of the textile printing apparatus 30 in which the printing apparatus 1 is used. The textile printing apparatus 30 has a steamer 31, a washing machine 32, a dryer 33, and an iron 34 in addition to the printing apparatus 1 shown in FIG. The steamer 31 performs steaming heat treatment on the print medium T on which the water-soluble UV-curable ink is UV-cured to dye the dye in the water-soluble UV-curable ink on the fiber. As a result, the print medium T is colored.

The washing machine 32 is an apparatus for washing the color-processed print medium T. Since the ultraviolet curable resin cured on the print medium T has a high water solubility, it can be washed off by the washing machine 32. The dryer 33 is a device for drying the print medium T, and the iron 34 is a device for ironing the dried print medium T.

Returning to FIG. 1, the configuration of the printing apparatus 1 will be described. The printing apparatus 1 has a carrying device 10 including a pinch roller, a guide roller and the like for carrying a print medium T such as a cloth. In FIG. 1, the transport device 10 transports the print medium T in the vertical direction from top to bottom, as indicated by the arrow D in the transport direction. In FIG. 1, the left side surface of the print medium T is referred to as a “first surface” and the right side surface is referred to as a “second surface”.

The printing apparatus 1 includes a first ejection unit 11, a second ejection unit 13, rear UV irradiators 15, 16 and mark position detection units 17, 18 from the upstream side. The rear UV irradiators 15 and 16 include the rear UV irradiator 15 for irradiating the first surface with ultraviolet rays and the rear UV irradiator 16 for irradiating the second surface with ultraviolet rays. Further, the mark position detecting units 17 and 18 also have a mark position detecting unit 17 for detecting the mark position on the first surface and a mark position detecting unit 18 for detecting the mark position on the second surface.

A first print heater 12 is provided on the opposite side of the first ejection unit 11 with the print medium T interposed therebetween, and a second print heater 13 is provided on the opposite side of the second ejection unit 13. The above components are connected to the control unit 20 and controlled by the control unit 20.

FIG. 2 is a schematic diagram showing the first discharge unit 11. The first ejection unit 11 has a plurality of inkjet heads 11a arranged in the transport direction of the print medium T and UV irradiators 11b on both sides thereof. The plurality of inkjet heads 11a eject the printing inks of different colors. By having the UV irradiator 11b adjacent to the inkjet head 11a, the printing ink ejected from the inkjet head 11a onto the print medium T is immediately cured by ultraviolet rays. Here, the plurality of inkjet heads 11a corresponds to the “first inkjet head”. Also, the UV irradiator 11b corresponds to the "first ultraviolet light source".

The second discharge unit 13 also has the same configuration as the first discharge unit 11. The plurality of inkjet heads 13a included in the second ejection unit 13 correspond to the "second inkjet head", and the UV irradiator 13b corresponds to the "second ultraviolet light source".

As shown in FIG. 1, the first ejection unit 11 and the second ejection unit 13 are located on opposite sides of the print medium T with the print medium T interposed therebetween. The second discharge unit 13 is arranged downstream of the first discharge unit 11 in the transport direction. The first ejection unit 11 and the second ejection unit 13 are arranged with a width larger than the width of the inkjet head 11a (or the inkjet head 13a having the same configuration) in the nozzle row direction. With this configuration, the first ejection unit 11 ejects the printing ink onto the first surface and cures it with ultraviolet light to suppress the swelling of the print medium due to the printing ink, and then the second ejection unit 13 performs the second ejection. It is possible to discharge the printing ink to the surface and to cure with ultraviolet light.

Post-UV irradiators 15 and 16 for irradiating both the first surface and the second surface with ultraviolet light are disposed downstream of the second discharge unit 13. After that, the printing ink ejected onto the first surface and the second surface is further hardened by the UV irradiators 15 and 16. Mark position detection units 17 and 18 are provided downstream of the rear UV irradiator. The mark position detection units 17 and 18 have a function of detecting a mark previously given to the print medium T. Based on the mark detection results by the mark position detection units 17 and 18, the control unit 20 adjusts the print positions of the images on the first surface and the second surface, and matches the positions of the symbols on both the front and back sides. be able to.

The printing apparatus 1 having the above configuration conveys the print medium T from the upper side to the lower side in FIG. 1, and ejects the printing ink onto the first surface of the print medium T by the first inkjet head 11a. The UV irradiator 11b radiates ultraviolet rays to cure the printing ink. Subsequently, the printing ink is ejected onto the second surface by the second inkjet head 13a, and ultraviolet rays are irradiated by the UV irradiator 13b to cure the printing ink. At this time, the ejection positions of the printing inks by the first inkjet head 11a and the second inkjet head 13a are adjusted based on the positions of the marks detected by the mark position detection units 17 and 18. The printing apparatus 1 further cures the printing ink on the first surface and the second surface by the rear UV irradiators 15 and 16 downstream of the UV irradiator 13b.

Next, the print medium T is steam-heat treated to dye the fiber, and then the print medium T is washed to dissolve and drop the ultraviolet curing compound. Then, the print medium T is dried and ironed. As a result, images can be formed on both sides of the print medium T such as cloth without blurring or deviation of the design.

(Second embodiment)
FIG. 4 is a schematic diagram showing the configuration of the printing device 2 according to the second embodiment. The printing apparatus 2 of the second embodiment uses a printing ink that requires a mordant such as an acid dye or a reactive dye or an auxiliary agent (hereinafter, simply referred to as “auxiliary agent”) for promoting a color reaction. It is a device.

The printing apparatus 2 according to the second embodiment has the same basic configuration as the printing apparatus 1 according to the first embodiment, but the printing apparatus 2 according to the second embodiment includes a first ejection unit 11 Has a third discharge unit 21 for printing the auxiliary ink. The third ejection unit 21, like the first ejection unit 11, has an inkjet head 21a and a UV irradiator 21b. The auxiliary ink is an ink which contains an auxiliary agent or a mordant for accelerating the color development reaction, and contains an ultraviolet-curable compound which becomes an easily water-soluble resin after ultraviolet curing as a main component.

The inkjet head 21a ejects the auxiliary ink to the portion of the first ejection unit 11 that ejects the printing ink. The portion for ejecting the auxiliary ink may cover at least the portion for ejecting the printing ink, and may be larger than the portion for ejecting the printing ink. The UV irradiator 21b UV cures the auxiliary ink ejected onto the print medium T by the inkjet head 21a.

The first print heater 12 is provided over a range that covers the first ejection unit 11 and the inkjet head 21. As a result, even when a solvent such as water is added to the auxiliary ink in order to adjust the viscosity and the permeability to the cloth, the print heater 12 evaporates the solvent component to form the print medium T. It can be dried to reduce bleeding.

The printing apparatus 2 according to the second embodiment also includes a fourth ejection unit 22 that ejects the auxiliary ink upstream of the second ejection unit 13 as in the first embodiment. The configuration of the fourth discharge unit 22 is the same as that of the third discharge unit 21. The fourth ejection unit 22 ejects the auxiliary ink to the portion of the second ejection unit 13 that ejects the printing ink.

(Modification 1 of the second embodiment)
In the above-described second embodiment, the auxiliary ink is ejected onto the print medium T using the third ejection unit 21 and the fourth ejection unit 22, but the first ejection unit 11 and the fourth ejection unit 22 eject the auxiliary ink. The textile printing ink ejected from the second ejection unit 13 may include an auxiliary agent.

(Modification 2 of the second embodiment)
In the above-described second embodiment, an example in which the third discharge unit 21 is arranged upstream of the first discharge unit 11 and the fourth discharge unit 22 is arranged upstream of the second discharge unit 13 is described. Although described, the third discharge unit 21 may be arranged downstream of the first discharge unit 11 and the fourth discharge unit 22 may be arranged downstream of the second discharge unit 13. Even if the auxiliary ink is ejected after the printing ink is ejected, the color reaction of the printing ink can be promoted by the auxiliary.

(Third Embodiment)
FIG. 5 is a schematic view of the printing apparatus 3 according to the third embodiment as viewed from above. The printing apparatus 3 of the third embodiment is different from the printing apparatus 1 of the first embodiment in the transport mechanism of the print medium T. In FIG. 5, the arrow D indicates the transport direction of the print medium T. The printing device 3 according to the third embodiment conveys the print medium T in the horizontal direction. The transport mechanism transports the print medium T with the first side facing up. The transport mechanism has a reversing mechanism 24 that reverses the front and back of the print medium T, and folds the print medium T in a direction perpendicular to the transport direction. As a result, the printing device 3 conveys the print medium T with the second surface facing upward in the downstream of the reversing mechanism 24.

The printing apparatus 3 includes, in order from the upstream side, the mark position detection unit 17 on the first surface, the first ejection unit 11, the mark position detection unit 18 on the second surface, the tension controller 23, the reversing mechanism 24, and the second ejection unit. It has a unit 13. The first ejection unit 11 has a first inkjet head 11a and a UV irradiator 11b, and the second ejection unit 13 has a second inkjet head 13a and a UV irradiator 13b. The components described above are connected to the control unit 20 and controlled by the control unit 20. Although not shown in FIG. 5, a first heater and a second heater are provided on the lower side of the print medium T of the first discharge unit 11 and the second discharge unit 13, respectively. ..

The tension controller 23 has a function of constantly controlling the tension applied to the print medium T so that the print medium T is not wrinkled when the print medium T is folded back by the reversing mechanism 24. The other configurations of the printing apparatus 3 are the same as those of the printing apparatus 1 described in the first embodiment.

(Effects of the embodiment)
(1) The printing devices 1 to 3 according to the present embodiment include a transport mechanism 10 for the print medium T, an inkjet head 11a for ejecting the water-soluble UV-curable printing ink onto the first surface of the print medium T, and a UV irradiator. 11b, an inkjet head 13a for ejecting the water-soluble UV-curable printing ink onto the second surface of the print medium T, and a UV irradiator 13b, and the printing ink ejected on the print medium T is UV-cured. T does not swell with the printing ink, and dimensional change due to expansion and contraction of the print medium T can be suppressed. As a result, when printing on both sides, it is possible to print without shifting the design. Further, since the printing ink becomes an easily water-soluble resin after being cured by ultraviolet rays, the resin can be easily washed off after the dye is dyed on the print medium T.

(2) In the printing apparatuses 1 to 3 of the present embodiment, the water-soluble sizing agent contained in the printing ink as a main component is an easily water-soluble mixture, so that the water-soluble sizing agent can be easily washed off.

(3) In the printing devices 1 to 3 of the present embodiment, since the evaporative solvent contained in the water-soluble UV curable ink is 20 to 70% by weight, the elongation of the print medium T due to swelling can be suppressed.

(4) In the printing apparatus 2 according to the second embodiment, the third inkjet head 21a that ejects the auxiliary ink and the second inkjet head to the portion that ejects the printing ink with the first inkjet head 11a. A fourth inkjet head 23a that ejects the auxiliary ink is provided on the portion of the textile ink that is ejected at 13a. With this configuration, when using a printing ink such as an acid dye or a reactive dye that requires a mordant or an auxiliary agent for accelerating the color development reaction, printing is performed on a print medium which is not previously coated with the auxiliary agent. be able to.

(5) In the printing apparatus according to the modified example 1 of the second embodiment, the printing ink contains an auxiliary agent or a mordant for promoting the color forming reaction, and therefore the printing ink requiring the auxiliary agent. Can be used for printing.

(6) In the printing apparatuses 1 to 3 of the present embodiment, the print heater 12 disposed on the opposite side of the first inkjet head 11a with the print medium T interposed therebetween and the second inkjet head with the print medium T interposed therebetween. Since the print heater 14 is provided on the opposite side of 13a, the print heaters 12 and 14 can evaporate water and suppress the dimensional change due to swelling.

(7) The printing apparatuses 1 to 3 according to the present embodiment use the mark position detecting units 17 and 18 for detecting marks provided on both sides of the print medium T and the marks detected by the mark position detecting units 17 and 18. Based on the first inkjet head 11a and the second inkjet head 13a, the controller 20 for adjusting the print position is provided. With this configuration, it is possible to control the first inkjet head 11a and the second inkjet head 13a based on the mark provided in advance so that the symbols on both sides correspond to each other.

(8) In the printing apparatuses 1 and 2 of the first and second embodiments, the transport mechanism 10 prints at a position where the printing ink is ejected by the first inkjet head 11a and the second inkjet head 13a. The medium T is transported in the vertical direction. Then, the first inkjet head 11a and the second inkjet head 13a are on the opposite sides of the print medium T and in the transport direction, the first inkjet head 11a (or the second inkjet head 13a having the same configuration). The width is larger than the width in the nozzle row direction.

With this configuration, since the printing ink is ejected horizontally to the print medium T in both the printing by the first inkjet head 11a and the second inkjet head 13a, the same conditions are applied to the first surface and the second surface. It is possible to eject the printing ink with. In addition, the first ejection unit 11 ejects the printing ink onto the first surface and cures with ultraviolet light to suppress the swelling of the print medium due to the printing ink, and then the second ejection unit 13 performs the second surface. It is possible to discharge the printing ink to and to cure with UV light.

(9) In the printing device 3 of the third embodiment, the transport mechanism transports the print medium T in the horizontal direction, and the print medium T is placed between the first inkjet head 11a and the second inkjet head 13a. It has a reversing mechanism 24 for reversing the front and back. With this configuration, the printing ink is ejected from the upper direction in both the printing by the first inkjet head 11a and the second inkjet head 13a, and therefore the printing ink is ejected on the first surface and the second surface under the same conditions. be able to.

(10) In the printing method according to the present embodiment, the transport mechanism 10 that transports the print medium T, the step of discharging the water-soluble UV-curable printing ink onto the first surface of the print medium T, and the ultraviolet ray onto the first surface. The step of irradiating with, the step of ejecting the water-soluble UV curable printing ink onto the second surface of the print medium T, and the step of irradiating the second surface with ultraviolet rays. Since the printing ink ejected onto the print medium T is UV-cured in this manner, the print medium T does not swell with the printing ink, and dimensional changes due to expansion and contraction of the print medium T can be suppressed. As a result, when printing on both sides, it is possible to print without shifting the design. Further, since the printing ink becomes an easily water-soluble resin after being cured by ultraviolet rays, the resin can be easily washed off after the dye is dyed on the print medium T.

INDUSTRIAL APPLICATION This invention is useful as an inkjet printer etc. which print an image on print media, such as cloth.

1-3 Printing Device 10 Conveyance Mechanism 11 First Ejection Unit 11a First Inkjet Head 11b UV Irradiator (First Ultraviolet Light Source)
12 Print heater (first heater)
13 Second Ejection Unit 13a Second Inkjet Head 13b UV Irradiator (Second Ultraviolet Light Source)
14 Print heater (second heater)
15, 16 Rear UV irradiator 17, 18 Mark position detection unit 20 Control unit 21 Third ejection unit 21a Third inkjet head 21b UV irradiator 22 Fourth ejection unit 22a Fourth inkjet head 22b UV irradiator 23 Tension controller 24 Inversion mechanism 31 Steamer 32 Washer 33 Dryer 34 Iron

Claims (10)

A transport mechanism that transports a print medium that is a cloth,
A first ink jet head for ejecting a printing ink containing a dye mainly composed of an ultraviolet curable compound, which becomes an easily water-soluble resin after ultraviolet curing, onto the first surface of the print medium;
A first ultraviolet light source that generates ultraviolet rays that cures the printing ink ejected from the first inkjet head on the print medium to an extent that swelling of the print medium due to the printing ink is suppressed;
A second inkjet head that discharges a printing ink containing a dye mainly containing an ultraviolet-curable compound that becomes an easily water-soluble resin after ultraviolet curing onto the second surface of the print medium, downstream of the first ultraviolet light source. ,
A second ultraviolet light source that generates ultraviolet light that cures the printing ink ejected from the second inkjet head on the print medium to such an extent that swelling of the print medium due to the printing ink is suppressed.
A printing device having a. The first ultraviolet light source is provided adjacent to both sides of the first inkjet head, and the second ultraviolet light source is provided adjacent to both sides of the second inkjet head.
The first ultraviolet light source and the second ultraviolet light source are for temporarily curing the textile printing ink,
Downstream of the front Stories second ultraviolet light source, printing apparatus as claimed in claim 1, further comprising a main curing ultraviolet light source for curing the printing ink. The printing device according to claim 1, wherein the evaporative solvent contained in the printing ink is 20 to 70% by weight. The UV-curable compound mainly containing an auxiliary agent or a mordant for accelerating the color-forming reaction, which is a water-soluble resin after UV-curing, is mainly contained in the portion where the printing ink is ejected or the portion ejected by the first inkjet head. A third inkjet head for ejecting auxiliary ink as a component,
The second ink jet head is mainly composed of an ultraviolet-curing compound which contains an auxiliary agent or a mordant for accelerating the color-forming reaction in a portion where the printing ink is ejected or is ejected and which becomes an easily water-soluble resin after ultraviolet curing. A fourth inkjet head for ejecting auxiliary ink as a component;
The printing apparatus according to claim 1, further comprising: The printing apparatus according to claim 1, wherein the printing ink contains an auxiliary agent or a mordant for promoting a color development reaction. A first heater disposed on the opposite side of the first inkjet head with the print medium interposed therebetween;
A second heater disposed on the opposite side of the second inkjet head with the print medium interposed therebetween;
The printing apparatus according to claim 1, further comprising: A mark position detection unit that detects the positions of marks provided on both sides of the print medium;
A control unit for adjusting print positions of the first inkjet head and the second inkjet head based on the position of the mark detected by the mark position detection unit;
The printing apparatus according to claim 1, further comprising: The transport mechanism transports the print medium in a vertical direction at a position where textile printing ink is ejected by the first inkjet head and the second inkjet head.
The printing apparatus according to claim 1, wherein the first inkjet head and the second inkjet head are arranged on opposite sides of the print medium. 8. The transport mechanism according to claim 1, further comprising a reversing mechanism that transports the print medium in a horizontal direction and reverses the front and back sides of the print medium between the first inkjet head and the second inkjet head. The printing device according to claim 1. A step of ejecting a printing ink containing a dye mainly composed of an ultraviolet-curing compound, which becomes an easily water-soluble resin after ultraviolet-curing, onto the first surface of a print medium which is a cloth;
A step of irradiating the area where the printing ink is ejected with a first inkjet head with ultraviolet rays to cure the printing ink on the print medium to the extent that swelling of the printing medium due to the printing ink is suppressed.
Discharging a printing ink containing a dye containing an ultraviolet-curing compound as a main component, which becomes an easily water-soluble resin after ultraviolet-curing, onto the second surface of the print medium;
A step of irradiating the area where the printing ink is ejected with a second inkjet head with ultraviolet rays to cure the printing ink on the print medium to the extent that swelling of the print medium due to the printing ink is suppressed;
A printing method comprising.

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