Printing apparatus and printing method

Abstract

To provide a printing apparatus and printing method that offers good print image durability and a good texture of the printed area. [Solution] A printing apparatus comprising: a placement section on which cotton fabric or a transfer sheet is selectively placed; a printing section capable of dispensing image-forming ink and adhesive liquid, respectively; and a control unit for controlling the operation of the printing section, wherein the control unit has a selection section for selecting a first mode in which the operation of the printing section is controlled to dispensing the image-forming ink toward the cotton fabric placed on the placement section to form a first image layer; and a second mode in which the operation of the printing section is controlled to dispensing the image-forming ink toward the transfer sheet placed on the placement section to form a second image layer, and after the formation of the second image layer, dispensing the adhesive liquid toward the second image layer to form an adhesive layer.

Description

[Technical Field]

[0001] The present invention relates to a printing apparatus and a printing method. [Background technology]

[0002] Patent Document 1 below discloses an apparatus capable of performing two printing methods: a DTG (Direct to Garment) method in which an image is formed directly onto the fabric, and a DTF (Direct to Film) method in which an image is formed on a transfer sheet and the image formed on the transfer sheet is transferred onto the fabric. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2024-168155 [Overview of the project] [Problems that the invention aims to solve]

[0004] Incidentally, the inventors' investigations revealed that, from the viewpoint of improving both the durability of the printed image and the texture of the fabric in the printed area, the suitability of the two printing methods differs depending on the material and other conditions of the fabric to be printed. [Means for solving the problem]

[0005] A printing apparatus according to an application example of the present invention, A mounting section on which cotton fabric or a transfer sheet is selectively placed, A printing unit capable of dispensing image-forming ink and adhesive liquid, A control unit that controls the operation of the printing unit, Equipped with, The control unit, A first mode involves controlling the operation of the printing unit to eject the image-forming ink toward the cotton fabric placed on the aforementioned mounting unit to form a first image layer, A second mode involves controlling the operation of the printing unit to eject the image-forming ink toward the transfer sheet placed on the aforementioned mounting unit to form a second image layer, and after the formation of the second image layer, ejecting the adhesive liquid toward the second image layer to form an adhesive layer. It has a selection section for selecting an option.

[0006] The printing method according to an application example of the present invention is: Identify whether the printing medium placed on the mounting section is cotton fabric or a transfer sheet. If the printing medium placed on the mounting unit is the cotton fabric, a first mode is selected and executed in which image-forming ink is ejected from the printing unit toward the cotton fabric to form a first image layer. If the printing medium placed on the mounting unit is the transfer sheet, a second mode is selected and executed in which the image-forming ink is ejected from the printing unit toward the transfer sheet to form a second image layer, and the adhesive liquid is ejected toward the second image layer to form an adhesive layer. [Brief explanation of the drawing]

[0007] [Figure 1] This is a perspective view showing a printing apparatus according to the first embodiment of the present invention. [Figure 2] This is a cross-sectional view showing a portion of a cotton fabric that has been printed using the printing apparatus shown in Figure 1. [Figure 3] This is a cross-sectional view showing a portion of a transfer sheet that has been printed using the printing apparatus shown in Figure 1. [Figure 4] This is a cross-sectional view showing a portion of a polyester fabric that has been transferred using the printed transfer sheet shown in Figure 3. [Figure 5] This is a bottom view showing the inkjet head of the printing unit in the printing apparatus shown in Figure 1. [Figure 6] Figure 5 is a plan view showing the scanning path of the inkjet head. [Figure 7] This is a block diagram of the printing apparatus shown in Figure 1. [Figure 8] This is a flowchart showing a printing method according to the first embodiment of the present invention. [Figure 9] It is a flowchart showing details of a step of printing performed by a printing apparatus in accordance with the setting information of FIG. 8. [Figure 10] It is a cross-sectional view showing a part of a transfer sheet printed using the printing apparatus according to the second embodiment of the present invention.

Mode for Carrying Out the Invention

[0008] Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following description does not limit the technical scope described in the claims or the meanings of terms. In addition, dimensional ratios in the drawings are exaggerated for convenience of explanation, and may differ from actual ratios.

[0009] In each drawing, an X-axis, a Y-axis, and a Z-axis are set as three mutually orthogonal axes. Each axis is represented by an arrow, the tip end side of the arrow is defined as the "+ side", and the base end side of the arrow is defined as the "- side". In the following description, for example, the "X-axis direction" includes both the positive direction and the negative direction of the X-axis. The same applies to the Y-axis direction and the Z-axis direction. In addition, in the following description, particularly, the positive side in the Z-axis direction is referred to as "upper", and the negative side in the Z-axis direction is referred to as "lower". The Z-axis does not need to be parallel to the vertical axis, and may be inclined with respect to the vertical axis.

[0010] <First Embodiment> FIG. 1 is a perspective view showing a printing apparatus 1 according to the first embodiment. FIG. 2 is a cross-sectional view showing a part of a cotton fabric M1 printed using the printing apparatus 1 of FIG. 1. FIG. 3 is a cross-sectional view showing a part of a transfer sheet M2 printed using the printing apparatus 1 of FIG. 1. FIG. 4 is a cross-sectional view showing a part of a polyester fabric M3 transferred using the printed transfer sheet M2 of FIG. 3. FIG. 5 is a bottom view showing an inkjet head 31 included in a printing unit 30 of the printing apparatus 1 of FIG. 1. FIG. 6 is a plan view showing a scanning path a4 of the inkjet head 31 of FIG. 5. FIG. 7 is a block diagram showing the printing apparatus 1 of FIG. 1.

[0011] The printing apparatus 1 according to the present embodiment is a printing apparatus 1 that can select two modes, namely a first mode compatible with the DTG method that performs direct printing on fabric and a second mode compatible with the DTF method that performs printing on a transfer sheet M2, in accordance with the material of the fabric on which printing is finally performed. In the following description, two cases will be explained: the case where the fabric on which printing is finally performed is the cotton fabric M1 shown in FIG. 1 and FIG. 2, and the case where it is the polyester fabric M3 shown in FIG. 4.

[0012] In the present specification, the term "cotton fabric M1" refers to a fabric in which the ratio of the total mass of cotton fibers to the total mass of the fabric, that is, the blending ratio of cotton fibers, is 50% by mass or more. Therefore, the cotton fabric M1 may be composed of only cotton fibers, or may contain fibers other than cotton fibers. Examples of fibers other than cotton fibers include natural fibers such as silk, hemp and wool, regenerated fibers such as rayon, cupra and polynosic, and chemical fibers such as polyester, polyamide, polyurethane, acrylic, acetate, vinylon and aramid.

[0013] In addition, in the present specification, the term "polyester fabric M3" refers to a fabric in which the blending ratio of polyester fibers is more than 50% by mass. Therefore, the polyester fabric M3 may be composed of only polyester fibers, or may contain fibers other than polyester fibers, for example, natural fibers such as cotton, silk, hemp and wool, regenerated fibers such as rayon, cupra and polynosic, and chemical fibers such as polyamide, polyurethane, acrylic, acetate, vinylon and aramid. The blending ratio is measured by a method in accordance with the fiber blending ratio test specified in JIS L 1030-2:2024.

[0014] The cotton fabric M1 and the polyester fabric M3 may be raw fabric, or may be processed products (sewn products) such as clothing including underwear, T-shirts, dress shirts and socks, bedding including sheets, duvet covers and pillowcases, and towels, handkerchiefs, hand towels and curtains, for example. The cotton fabric M1 and the polyester fabric M3 each include woven fabrics, knitted fabrics and non-woven fabrics. Examples of woven fabrics include plain weave, twill weave and satin weave. Examples of knitted fabrics include jersey knit and crocheted knit.

[0015] The transfer sheet M2 includes a sheet-like substrate (not shown) made of resin and a release layer (not shown) laminated on at least one surface of the substrate. The resin constituting the substrate is not particularly limited, but examples include polyester such as polyethylene terephthalate, polyethylene, polyolefin such as polypropylene, polyamide, polyimide, acrylic resin, fluororesin, polyurethane, polyvinyl chloride, etc. The substrate may be a laminate of two or more layers made of different materials, for example. The release layer has the function of making it easier to peel off the second image layer Pc2, which will be described later, from the transfer sheet M2. The constituent material of the release layer is not particularly limited, but examples include polyethylene wax-based release agents, silicone-based release agents, fluororesin-based release agents, etc.

[0016] In this embodiment, the cotton fabric M1 is printed using the printing device 1 in a first mode compatible with the DTG method. For the polyester fabric M3, first, the transfer sheet M2 is printed using the printing device 1 in a second mode compatible with the DTF method, and then the image from the printed transfer sheet M2 is transferred to the polyester fabric M3.

[0017] Specifically, in the first mode compatible with the DTG method, as will be described in detail later, image-forming ink is ejected from the printing unit 30 of the printing apparatus 1 (described later) toward the cotton fabric M1 to form an image layer Pc1 corresponding to the desired image data to be printed, as shown in Figure 2. In this specification, when a component such as the cotton fabric M1 is referred to as A, and an ejected liquid such as image-forming ink as B, and it is expressed as "dispense B toward A to form layer C", this includes not only the case where B is directly ejected onto A to form a layer C composed of B on A, but also the case where, with another layer D formed on A, B is ejected toward A via the D layer to form a layer C on the D layer. Therefore, it is also possible to form a background layer Pw1 by ejecting white ink from the printing unit 30 toward the cotton fabric M1, and then form the image layer Pc1 by ejecting the image-forming ink as described above (see Figure 2). By forming the image layer Pc1 on the background layer Pw1, the color development of the image layer Pc1 can be improved regardless of the color of the cotton fabric M1. Hereinafter, the image layer Pc1 formed in the first mode will also be referred to as "first image layer Pc1," and the background layer formed in the first mode will also be referred to as "first background layer Pw1."

[0018] In the second mode, which is compatible with the DTF method, as shown in Figure 3 (details will be described later), the printing device 1 ejects image-forming ink from the printing unit 30 toward the transfer sheet M2 to form an image layer Pc2 corresponding to the inverted image of the desired image data, and then ejects adhesive liquid from the printing unit 30 toward the image layer Pc2 to form an adhesive layer Pg2. Alternatively, white ink may be ejected from the printing unit 30 after the image-forming ink is ejected but before the adhesive liquid is ejected to form a background layer Pw2 between the adhesive layer Pg2 and the image layer Pc2 (see Figure 3). Next, the transfer sheet M2 removed from the printing device 1 is dried by heating or other means using a dryer (not shown) separate from the printing device 1. Next, the image printed on the transfer sheet M2 is transferred to the polyester fabric M3 using a transfer machine (not shown) separate from the printing device 1. Specifically, as shown in Figure 4, the adhesive layer Pg2 of the transfer sheet M2 is attached to the polyester fabric M3 and heat-pressed. This causes the adhesive layer Pg2 to heat-weld to the polyester fabric M3. Then, as shown by the arrow in Figure 4, the transfer sheet M2 is peeled off from the image layer Pc2. This transfers the image layer Pc2 to the polyester fabric M3. Hereafter, the image layer Pc2 formed in the second mode will also be called the "second image layer Pc2," and the background layer Pw2 formed in the second mode will also be called the "second background layer Pw2."

[0019] Furthermore, in the following, when image layers Pc1 and Pc2 and background layers Pw1 and Pw2 are formed, the background layers Pw1 and Pw2 are also collectively referred to simply as the "printed image." Through diligent research by the inventors, it was found that printing cotton fabric M1 using the DTG method improves the fastness of the printed image and the texture of the printed area. Here, "fastness" refers to the resistance to defects such as cracking or loss of the printed image when the fabric is washed, i.e., the durability of the printed image. "Texture" refers to the feel and impression when touched, meaning a sensory evaluation of the material's feel and texture, such as touch, feel against the skin, and comfort when worn. The following reasons are thought to explain why such differences occur depending on the fabric material.

[0020] Cotton fabric M1 has relatively high hydrophilicity. In contrast, the main component of the adhesive used in the DTF method is a thermoplastic resin, which has relatively high hydrophobicity (lipophilicity). Therefore, when printing on cotton fabric M1 using the DTF method, that is, when the adhesive layer Pg2 of the transfer sheet M2 is attached to the cotton fabric M1, the affinity between cotton fabric M1 and adhesive layer Pg2 is relatively low, resulting in relatively low adhesion of adhesive layer Pg2 to cotton fabric M1. As a result, it is thought that the fastness of the printed image decreases when printing on cotton fabric M1 using the DTF method. In contrast, when printing on cotton fabric M1 using the DTG method, the first background layer Pw1 and the first image layer Pc1 are formed on the cotton fabric M1 without the interposition of adhesive layer Pg2. Therefore, compared to the DTF method, the DTG method can improve the fastness of the printed image on cotton fabric M1.

[0021] Furthermore, the cotton fabric M1 has a relatively good texture, such as a soft feel. Therefore, when printing on the cotton fabric M1 using the DTF method, the area where the adhesive layer Pg2 is heat-sealed (the printed area) becomes hard and stiff, and the texture is easily perceived as degraded. In contrast, when printing on the cotton fabric M1 using the DTG method, the adhesive layer Pg2 is not heat-sealed, and the first background layer Pw1 and the first image layer Pc1 are formed by ejecting white ink and image-forming ink from the printing unit 30 onto the cotton fabric M1. Therefore, compared to the DTF method, the DTG method can improve the texture of the printed area of ​​the cotton fabric M1.

[0022] On the other hand, after diligent research by the inventors, it was found that polyester fabric M3 can be printed using the DTF method to improve the print image's durability and the texture of the printed area. The following reasons are considered to be for this.

[0023] Polyester fabric M3 has relatively high hydrophobicity. Furthermore, the main component of the adhesive used in the DTF method is a thermoplastic resin, which also has relatively high hydrophobicity. Therefore, when printing on polyester fabric M3 using the DTF method, the affinity between polyester fabric M3 and adhesive layer Pg2 is relatively high, resulting in strong adhesion of adhesive layer Pg2 to polyester fabric M3. Consequently, the DTF method can improve the print fastness of the polyester fabric M3 compared to the DTG method.

[0024] Furthermore, polyester fabric M3 tends to have an inferior texture compared to cotton fabric M1. Therefore, when printing on polyester fabric M3 using the DTF method, even if the adhesive layer Pg2 is heat-welded to the polyester fabric M3, the deterioration in the texture of the printed area is not as noticeable compared to the texture of the fabric itself.

[0025] Furthermore, further investigation by the inventors has shown that the polyester fabric M3 can also be printed using the DTF method to achieve good color reproduction of the printed image. The following reasons are thought to be for this: Polyester fabric M3 is often used in sportswear where breathability is required, and therefore it often has a relatively coarse weave. For this reason, when polyester fabric M3 is printed using the DTG method, the image forming ink easily passes through the weave of the polyester fabric M3, which tends to reduce color reproduction. In contrast, when polyester fabric M3 is printed using the DTF method, the second image layer Pc2 formed on the transfer sheet M2 is transferred to the polyester fabric M3, thus enabling good color reproduction.

[0026] Based on the above, the configuration of the printing device 1 will now be described. In the following, the cotton fabric M1 and the transfer sheet M2, which are the objects that the printing device 1 directly prints on, will be collectively referred to as the "printing medium." Referring to Figure 1, the printing device 1 comprises a mounting section 10 on which the cotton fabric M1 or the transfer sheet M2 is selectively placed, a base 20 that movably supports the mounting section 10, a printing section 30 that prints on the printing medium, a control section 40 that controls the operation of the printing section 30, and a housing 50 that houses the printing section 30 and the control section 40.

[0027] The mounting section 10 includes a platen 11 that is generally parallel to the XY plane, and a support section 12 that is positioned below the platen 11, extends in the Z direction, and supports the platen 11. The printing medium is placed on the platen 11.

[0028] The base 20 is positioned below the support portion 12 and extends out from an opening 52 in the housing 50, which will be described later. The base 20 has a flat main body portion 21 that is generally parallel to the XY plane, and a guide portion 22 that is positioned on the main body portion 21, extends along the Y axis direction, and guides the movement of the mounting portion 10 in the Y axis direction. The guide portion 22 is composed of, for example, a rail, groove, etc., that extends along the Y axis direction.

[0029] As shown by arrow a1 in Figure 1, the mounting section 10 is located on the outside of the housing 50 and is movable along the guide section 22 in the Y-axis direction from a mounting position where the printing medium is placed to a printing position located on the inside of the housing 50 where printing is performed on the printing medium. The mounting section 10 may be moved manually by an operator from the mounting position to the printing position, or a transport means such as an electric belt transport mechanism, a ball screw mechanism, or a rack and pinion mechanism may be provided on the guide section 22, and the mounting section 10 may be moved automatically from the mounting position to the printing position by this transport means. Furthermore, when the printing device 1 is not in use, the mounting section 10 and the base 20 may be housed inside the housing 50.

[0030] The printing unit 30 selectively ejects inks such as image-forming ink and white ink, or adhesive liquid, toward a printing medium placed on the mounting unit 10, thereby forming a predetermined pattern on the printing medium. In this specification, the adhesive liquid, white ink, and image-forming ink are collectively referred to as "ejected liquid." The printing unit 30 includes an inkjet head 31 capable of ejecting image-forming ink, white ink, and adhesive liquid, respectively, and a carriage 32 that can move the inkjet head 31 in the main scanning direction a2 and the sub-scanning direction a3. The printing unit 30 is also connected to an ejected liquid supply source (ejected liquid storage unit), not shown, which supplies image-forming ink, white ink, and adhesive liquid to the printing unit 30, respectively. In this embodiment, the main scanning direction a2 coincides with the X-axis direction, and the sub-scanning direction a3 coincides with the Y-axis direction.

[0031] In this embodiment, the image-forming ink is an aqueous ink containing a colorant and water. Examples of colorants include pigments and dyes, and one or more of these can be used in combination. The colorant may further contain a fluorescent agent and an optical modulation material. The image-forming ink may further contain at least one of the following: an organic solvent, a resin, a surfactant, a pH adjuster, a chelating agent, a drying agent, a plasticizer, a stabilizer, an antibacterial / antifungal agent, an antistatic agent, and a filler.

[0032] In this embodiment, the image-forming ink consists of four colors: cyan ink (C), magenta ink (M), yellow ink (Y), and black ink (K). However, the color, number of colors, and type of image-forming ink are not limited to those described above. For example, the image-forming ink may include inks that exhibit metallic colors or inks that exhibit fluorescent colors. The colorant content of the image-forming ink is not particularly limited, but is preferably 5% by mass or more and 20% by mass or less, and more preferably 8% by mass or more and 15% by mass or less.

[0033] The white ink is an aqueous ink containing a white colorant such as titanium dioxide, calcium carbonate, or aluminum hydroxide, and water. The white ink may further contain at least one of the following: an organic solvent, a resin, a surfactant, a pH adjuster, a chelating agent, a drying agent, a plasticizer, a stabilizer, an antibacterial / antifungal agent, and an antistatic agent. The content of the white colorant in the white ink is not particularly limited, but is preferably 5% by mass or more and 20% by mass or less, and more preferably 8% by mass or more and 15% by mass or less.

[0034] Organic solvents used in image forming inks and white inks are not particularly limited, but include, for example, glycerin; glycols such as ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, 1,3-propanediol, 1,2-butanediol, 1,2-pentanediol, 1,2-hexanediol, 1,4-butanediol, 1,5-pentanediol, and 1,6-hexanediol; ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, propylene glycol Examples include glycol monoethers such as monomethyl ether, propylene glycol monoethyl ether, dipropylene glycol monomethyl ether, dipropylene glycol monoethyl ether, and triethylene glycol monomethyl ether; nitrogen-containing solvents such as 2-pyrrolidone, N-methyl-2-pyrrolidone, and N-ethyl-2-pyrrolidone; and alcohols such as methanol, ethanol, n-propyl alcohol, iso-propyl alcohol, n-butanol, 2-butanol, tert-butanol, iso-butanol, n-pentanol, 2-pentanol, 3-pentanol, and tert-pentanol. These organic solvents may be used individually or in combination of two or more.

[0035] The resins used in the image-forming ink and the white ink are not particularly limited, but examples include urethane resins such as polyurethane, acrylic resins, styrene resins, rosin, polyamides, alkyd resins, epoxy resins, and phenolic resins. The resin content of the image-forming ink is not particularly limited, but is preferably 5% by mass or more and 20% by mass or less, and more preferably 8% by mass or more and 15% by mass or less. The resin content of the white ink is not particularly limited, but is preferably 5% by mass or more and 20% by mass or less, and more preferably 8% by mass or more and 15% by mass or less.

[0036] The surfactants used in image forming inks and white inks are not particularly limited, but examples include nonionic surfactants, anionic surfactants, cationic surfactants, and amphoteric surfactants.

[0037] The water content of the image-forming ink and the white ink is preferably 40% by mass or more and 80% by mass or less, and more preferably 50% by mass or more and 70% by mass or less. This optimizes the viscosity of the ink and allows for good ink ejection from the inkjet head 31.

[0038] The adhesive solution is an aqueous adhesive containing resin and water. The resin constituting the adhesive solution is preferably a thermoplastic resin such as polyester. Using polyester as the resin in the adhesive solution makes the adhesion of the adhesive layer Pg2 to the polyester fabric M3 stronger. As a result, the print fastness of the polyester fabric M3 can be further improved. Examples of polyester include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, or a mixture of two or more of these.

[0039] The adhesive may further contain one of the following: a colorant, an organic solvent, a surfactant, a pH adjuster, a chelating agent, a drying agent, a plasticizer, a stabilizer, an antibacterial / antifungal agent, and an antistatic agent. Examples of organic solvents used in the adhesive include those similar to those listed above. Examples of surfactants used in the adhesive include those similar to those listed above.

[0040] The glass transition temperature Tg of the resin constituting the adhesive is not particularly limited, but is preferably 15°C to 55°C, and more preferably 20°C to 50°C. By setting the glass transition temperature Tg of the resin constituting the adhesive within the above range, the fluidity of the adhesive at room temperature is improved, and the applicability of the adhesive can be improved.

[0041] The melting point of the resin constituting the adhesive solution is not particularly limited, but is preferably 75°C to 145°C, and more preferably 80°C to 140°C. By setting the melting point of the resin constituting the adhesive solution within the above range, the adhesive layer Pg2 can be firmly heat-welded to the polyester fabric M3 by heat pressing using a transfer machine, thereby improving the fastness of the printed image on the polyester fabric M3.

[0042] Here, the solid content of the adhesive solution is mainly resin. If the adhesive solution contains water-insoluble additives (colorants, etc.), these also constitute solid content, but in trace amounts relative to the resin. Therefore, hereafter, when referring to the "solid content of the adhesive solution," it refers to the amount of resin in the adhesive solution. The solid content concentration of the adhesive solution is not particularly limited, but is preferably 2% by mass or more and 30% by mass or less, and more preferably 5% by mass or more and 20% by mass or less. By setting the solid content concentration of the adhesive solution to the lower limit above, sufficient adhesion of the adhesive solution to the transfer sheet M2 can be ensured. Furthermore, by setting the solid content concentration of the adhesive solution to the upper limit above, the viscosity of the adhesive solution can be prevented from becoming excessively high, and the applicability of the adhesive solution by the printing part 30 can be improved.

[0043] In this embodiment, the operating method of the inkjet head 31 is a piezoelectric method. However, the operating method of the inkjet head 31 may also be a thermal method. The inkjet head 31 has a head body in which an internal flow channel (not shown) filled with the ejection liquid is formed for each ejection liquid. The head body is also provided with an ejection section for each ejection liquid, which is composed of a plurality of nozzle groups that communicate with the flow channel and have openings. The head body is also provided with a piezoelectric element (piezoelectric body) for each ejection section. When a voltage is applied to the piezoelectric element, a predetermined ejection liquid is ejected from the ejection section as a droplet.

[0044] As shown in Figure 5, the inkjet head 31 is equipped with the following ejection sections arranged in the X-axis direction in this order: a first ejection section 31g1 for adhesive liquid, a first ejection section 31w1 for white ink, a cyan ink ejection section 31c, a magenta ink ejection section 31m, a yellow ink ejection section 31y, a black ink ejection section 31k, a second ejection section 31w2 for white ink, and a second ejection section 31g2 for adhesive liquid.

[0045] The first discharge section 31g1 for the adhesive liquid is composed of a first nozzle group 32g1 that discharges the adhesive liquid. Similarly, the second discharge section 31g2 for the adhesive liquid is composed of a second nozzle group 32g2 that discharges the adhesive liquid. The first discharge section 31w1 for the white ink is composed of a first nozzle group 32w1 that discharges the white ink. Similarly, the second discharge section 31w2 for the white ink is composed of a second nozzle group 32w2 that discharges the white ink.

[0046] As described above, in this embodiment, the printing unit 30 is provided with a plurality of adhesive liquid discharge units 31g1 and 31g2, and the printing unit 30 is provided with a plurality of white ink discharge units 31w1 and 31w2. The adhesive liquid and white ink need to be applied to a relatively wide area that overlaps with the image layers Pc1 and Pc2 in a plan view, respectively. With the above configuration, the adhesive liquid and white ink can be applied to a relatively wide area efficiently in a short time. Furthermore, with the above configuration, an adhesive layer Pg2 and background layers Pw1 and Pw2 with uniform thickness and homogeneity can be formed.

[0047] The cyan ink ejection section 31c is composed of a nozzle group 32c that ejects cyan ink. The magenta ink ejection section 31m is composed of a nozzle group 32m that ejects magenta ink. The yellow ink ejection section 31y is composed of a nozzle group 32y that ejects yellow ink. The black ink ejection section 31k is composed of a nozzle group 32k that ejects black ink.

[0048] Note that each nozzle group, 32g1, 32w1, 32c, 32m, 32y, 32k, 32w2, and 32g2, is composed of multiple nozzles arranged in the Y-axis direction, but in Figure 5, the multiple nozzles are simplified and shown together as a single rectangle.

[0049] However, the configuration of the printing unit 30 is not limited to the above. For example, the number of inkjet heads 31 and carriages 32 provided in the printing unit 30 may each be two or more. In this case, multiple inkjet heads 31 may be provided with adhesive discharge units, white ink discharge units, and image forming ink discharge units distributed among them. Furthermore, the number of discharge units for each discharge liquid provided in the printing unit 30 is not limited to the above number, and may be one or more.

[0050] Furthermore, the configuration is not limited to the carriage 32 moving the inkjet head 31 in the sub-scanning direction a3 (Y-axis direction) as described above. The inkjet head 31 may be moved relative to the mounting section 10 by moving the mounting section 10 in the sub-scanning direction a3 using transport means provided on the base 20. Also, the printing section 30 may be a line type with multiple nozzles arranged in the X-axis direction of the printing area for each ejection section. In this case, the inkjet head 31 only needs to be able to move relative to the mounting section 10 in the Y-axis direction.

[0051] As shown in Figure 1, the housing 50 is rectangular in shape and has an internal space 51 where the mounting section 10 is placed when printing is performed, and an opening 52 on the side facing the Y-axis that communicates with the internal space 51. Before printing starts, the base 20 is pulled out from the opening 52 toward the Y-axis. The inkjet head 31 is also waiting before printing starts in a standby position, which is a position away from the printing medium on the mounting table 11 in the X-axis direction when viewed from the Z-axis direction.

[0052] As shown in Figure 7, the control unit 40 includes a storage unit 41 that stores various data and programs necessary for the operation of the printing device 1, a processing unit 42 that reads the various data and programs stored in the storage unit 41 and performs various processing, and a communication unit 43 that communicates with external devices such as the user's operating terminal 2. The storage unit 41, the processing unit 42, and the communication unit 43 are interconnected via a bus. Examples of the user's operating terminal 2 include a PC (Personal Computer), smartphone, tablet, etc.

[0053] The storage unit 41 is composed of memory such as RAM (Random Access Memory) or ROM (Read Only Memory). The storage unit 41 stores the printing conditions for the first mode and the printing conditions for the second mode, which will be described later.

[0054] The communication unit 43 is comprised of an interface that enables wireless or wired communication with the user's operating terminal 2.

[0055] The processing unit 42 is composed of at least one processor, such as a CPU (Central Processing Unit). The user sets print settings information on the operating terminal 2, including the material of the printing medium placed on the mounting unit 10, the image data to be printed, and whether or not to use white ink. The processing unit 42 includes an acquisition unit 42a that acquires setting information from the user's operating terminal 2 via a communication unit 43, a selection unit 42b that selects a mode according to the setting conditions, and a drive control unit 42c that controls the operation of each part according to the selected mode.

[0056] As mentioned above, the printing device 1 can operate in two modes: a first mode that is compatible with DTG and prints on cotton fabric M1, and a second mode that is compatible with DTF and prints on transfer sheet M2. Depending on the mode selected in the selection unit 42b, either the first mode or the second mode will be executed. More specifically, the first mode is further divided into a first sub-mode that uses white ink and a second sub-mode that does not use white ink. The second mode is further divided into a third sub-mode that uses white ink and a fourth sub-mode that does not use white ink.

[0057] If the selection unit 42b determines from the acquired setting information that a cotton fabric M1 is placed on the placement unit 10 and that white ink is to be used, it selects the first sub-mode of the first mode. When the first sub-mode is selected, the drive control unit 42c controls the operation of the printing unit 30 and, as shown in Figure 2, ejects white ink toward the cotton fabric M1 to form the first background layer Pw1, and ejects image forming ink toward the first background layer Pw1 to form the first image layer Pc1 corresponding to the image data of the setting information.

[0058] Specifically, in the first sub-mode, as shown by the scanning path a4 in Figure 6, when forming the first background layer Pw1, the inkjet head 31 is sequentially and repeatedly moved to one side in the main scanning direction a2 (X-axis direction + side), one side in the sub-scanning direction a3 (Y-axis direction + side), the other side in the main scanning direction a2 (X-axis direction - side), and one side in the sub-scanning direction a3 (Y-axis direction + side). During this movement, white ink is ejected from a predetermined ejection section of the inkjet head 31 at a position corresponding to the image data, thereby forming the first background layer Pw1.

[0059] Furthermore, when forming the first image layer Pc1, the inkjet head 31 is moved in the reverse direction along the scanning path a4 used when forming the first background layer Pw1. During this movement, the first image layer Pc1 is formed by ejecting image-forming ink from a predetermined ejection section of the inkjet head 31 at a position corresponding to the image data.

[0060] In other words, the inkjet head 31 ejects white ink on the forward path in the sub-scanning direction a3 and image-forming ink on the return path. Therefore, the first background layer Pw1 is formed on the forward path in the sub-scanning direction a3, and the first image layer Pc1 is formed on the return path in the sub-scanning direction a3. In this way, since the printing unit 30 ejects ink on both the forward and return paths in the sub-scanning direction a3, printing can be performed more efficiently compared to a case where the printing unit 30 ejects ink on only one of the forward or return paths in the sub-scanning direction a3. Furthermore, the time required for printing can be shortened.

[0061] Furthermore, if the selection unit 42b determines from the acquired setting information that a cotton fabric M1 is placed on the mounting unit 10 and that white ink is not to be used, it selects the second sub-mode of the first mode. In the second sub-mode, the drive control unit 42c controls the operation of the printing unit 30 and ejects image-forming ink toward the cotton fabric M1 to form a first image layer Pc1 corresponding to the image data.

[0062] Specifically, in the second sub-mode, when forming the first image layer Pc1, the inkjet head 31 is moved sequentially and repeatedly to one side in the main scanning direction a2 (X-axis direction + side), one side in the sub-scanning direction a3 (Y-axis direction + side), the other side in the main scanning direction a2 (X-axis direction - side), and one side in the sub-scanning direction a3 (Y-axis direction + side). During this movement, image-forming ink is ejected from a predetermined ejection section of the inkjet head 31 at a position corresponding to the image data, thereby forming the first image layer Pc1.

[0063] Furthermore, if the selection unit 42b determines from the acquired setting information that a transfer sheet M2 is placed on the mounting unit 10 and that white ink is to be used, it selects the third sub-mode of the second mode. In the third sub-mode, the drive control unit 42c controls the operation of the printing unit 30 and, as shown in Figure 3, ejects image-forming ink toward the transfer sheet M2 to form a second image layer Pc2 corresponding to the inverted image of the image data, ejects white ink toward the second image layer Pc2 to form a second background layer Pw2, and ejects adhesive liquid toward the second background layer Pw2 to form an adhesive layer Pg2.

[0064] Specifically, in the third sub-mode, when forming the second image layer Pc2, the inkjet head 31 is sequentially and repeatedly moved to one side in the main scanning direction a2 (X-axis direction + side), one side in the sub-scanning direction a3 (Y-axis direction + side), the other side in the main scanning direction a2 (X-axis direction - side), and one side in the sub-scanning direction a3 (Y-axis direction + side). During this movement, the second image layer Pc2 is formed by ejecting image-forming ink from a predetermined ejection section of the inkjet head 31 at a position corresponding to the inverted image.

[0065] Then, when forming the second background layer Pw2, the inkjet head 31 is moved in the reverse direction along the scanning path used to form the second image layer Pc2. During this movement, white ink is ejected from a predetermined ejection section of the inkjet head 31 at a position corresponding to the inverted image, thereby forming the second background layer Pw2.

[0066] Then, when forming the adhesive layer Pg2, the inkjet head 31 is moved in the same direction along the scanning path used when forming the second image layer Pc2. During this movement, the adhesive liquid is ejected from a predetermined ejection section of the inkjet head 31 at a position corresponding to the inverted image, thereby forming the adhesive layer Pg2.

[0067] In other words, in the third sub-mode, the inkjet head 31 ejects image-forming ink on the first forward pass in the sub-scanning direction a3, white ink on the first return pass, and adhesive ink on the second forward pass. Therefore, the second image layer Pc2 is formed on the first forward pass, the second background layer Pw2 is formed on the first return pass, and the adhesive layer Pg2 is formed on the second forward pass. In this way, since the printing unit 30 ejects on both the forward and return passes in the sub-scanning direction a3, printing can be performed more efficiently compared to the case where the printing unit 30 ejects on only one of the forward or return passes in the sub-scanning direction a3. Furthermore, the time required for printing can be shortened.

[0068] Furthermore, if the selection unit 42b determines from the acquired setting information that a transfer sheet M2 is placed on the mounting unit 10 and that white ink is not to be used, it selects the fourth sub-mode of the second mode. In the fourth sub-mode, the drive control unit 42c controls the operation of the printing unit 30, ejects image-forming ink toward the transfer sheet M2 to form a second image layer Pc2 corresponding to the inverted image, and ejects adhesive liquid toward the second image layer Pc2 to form an adhesive layer Pg2.

[0069] Specifically, in the fourth submode, when forming the second image layer Pc2, the inkjet head 31 is moved sequentially and repeatedly to one side in the main scanning direction a2 (X-axis direction + side), one side in the sub-scanning direction a3 (Y-axis direction + side), the other side in the main scanning direction a2 (X-axis direction - side), and one side in the sub-scanning direction a3 (Y-axis direction + side). During this movement, the second image layer Pc2 is formed by ejecting image-forming ink from a predetermined ejection section of the inkjet head 31 at a position corresponding to the inverted image.

[0070] Then, when forming the adhesive layer Pg2, the inkjet head 31 is moved in the reverse direction along the scanning path used when forming the second image layer Pc2. During this movement, the adhesive liquid is ejected from a predetermined ejection section of the inkjet head 31 at a position corresponding to the inverted image, thereby forming the adhesive layer Pg2.

[0071] In other words, the inkjet head 31 ejects image-forming ink on the forward path in the sub-scanning direction a3 and adhesive liquid on the return path. Therefore, the second image layer Pc2 is formed on the forward path in the sub-scanning direction a3, and the adhesive layer Pg2 is formed on the return path in the sub-scanning direction a3. In this way, since the printing unit 30 ejects on both the forward and return paths in the sub-scanning direction a3, printing can be performed more efficiently compared to the case where the printing unit 30 ejects on only one of the forward or return paths in the sub-scanning direction a3. Furthermore, the time required for printing can be shortened.

[0072] However, the scanning path a4 of the inkjet head 31 is not limited to the above. For example, the forward path and the return path of the inkjet head 31 in the sub-scanning direction a3 do not have to coincide. Also, for example, the scanning path may involve moving the inkjet head 31 back and forth in the main scanning direction a2 before moving it in the sub-scanning direction a3.

[0073] Next, the differences in printing conditions between the first mode and the second mode will be described. In this embodiment, the printing conditions include the amount of white ink to be printed and the time interval from the completion of ejection of one liquid to the start of ejection of the other liquid by the inkjet head 31.

[0074] In this embodiment, the amount of white ink W1 in the first mode is greater than the amount of white ink W2 in the second mode. That is, W1 > W2. In this specification, "amount of white ink W1, W2" refers to the mass of white ink per unit area in the area where white ink is applied to the printing medium, and the unit is usually g / m². 2is used. The cotton fabric M1 has relatively higher water absorbency than the transfer sheet M2. Therefore, by setting W1>W2, even if the cotton fabric M1 absorbs a part of the white ink, the first background layer Pw1 with sufficient thickness can be formed on the cotton fabric M1. Accordingly, the color developability of the first image layer Pc1 formed on the first background layer Pw1 can be improved. On the other hand, the transfer sheet M2 has relatively low water absorbency. Therefore, by setting W1>W2, desolvation (drying) of the second background layer Pw2 formed on the transfer sheet M2 can be performed quickly, and excessive thickening of the second background layer Pw2 can be suppressed. This allows efficient use of the white ink in accordance with the mode, and also enables obtaining a more uniform second background layer Pw2.

[0075] The ratio of the ejection amounts W1 / W2 is not particularly limited, but is preferably 1.5 or more and 4.0 or less, and more preferably 2.0 or more and 3.0 or less. The ejection amount W1 is not particularly limited, but is 30 g / m 2 or more and 160 g / m 2 or less, preferably 40 g / m 2 or more and 120 g / m 2 or less, and more preferably. The ejection amount W2 is not particularly limited, but is 20 g / m 2 or more and 40 g / m 2 or less, preferably 25 g / m 2 or more and 35 g / m 2 or less, and more preferably.

[0076] Furthermore, in the first submode, the time interval Δt1 from the completion of white ink ejection to the start of image-forming ink ejection is longer than the time interval Δt2 from the completion of white ink ejection to the start of adhesive liquid ejection in the third submode. That is, Δt1 > Δt2. As a result, when printing on cotton fabric M1 with a relatively large amount of white ink W1, the amount of solvent such as water contained in the first background layer Pw1 can be sufficiently reduced, i.e., the solvent can be sufficiently removed before forming the first image layer Pc1. Therefore, mixing of the white ink and the image-forming ink can be suppressed, which can lead to blurred printed images. Also, when printing on transfer sheet M2 with a relatively small amount of white ink W2, the time from the completion of the formation of the second background layer Pw2 to the start of the formation of the adhesive layer Pg2 can be suppressed from becoming excessively long, thereby shortening the printing time. In particular, in this embodiment, the printing unit 30 is provided with two white ink ejection units 31w1 and 31w2. Therefore, by changing the number of white ink ejection units 31w1 and 31w2 used depending on the mode, the amount of white ink injected W1 and W2 can be easily changed for multiple modes.

[0077] The ratio of time intervals Δt1 / Δt2 is not particularly limited, but is preferably 2 or more and 4 or less, and more preferably 3 or more and 4 or less. The time interval Δt1 is not particularly limited, but is preferably 4 seconds or more and 20 seconds or less, and more preferably 6 seconds or more and 16 seconds or less. The time interval Δt2 is not particularly limited, but is preferably 2 seconds or more and 5 seconds or less, and more preferably 2 seconds or more and 4 seconds or less.

[0078] Furthermore, it is preferable to set the time interval Δt3 from the completion of ejection of the image-forming ink to the start of ejection of the white ink in the third sub-mode, and the time interval Δt4 from the completion of ejection of the image-forming ink to the start of ejection of the adhesive ink in the fourth sub-mode, to be shorter than the time interval Δt1. This shortens the time required for printing in the second mode. The time intervals Δt3 and Δt4 may be the same as or different from the time interval Δt2, for example.

[0079] However, the printing conditions are not limited to those described above. For example, the relationship between the input amounts W1 and W2 is not limited to those described above and may be the same. Also, the relationship between the time intervals Δt1 and Δt2 is not limited to those described above and may be the same.

[0080] Next, the printing method according to this embodiment will be described. Figure 8 is a flowchart showing the printing method according to this embodiment. Figure 9 is a flowchart (subroutine) showing the details of process S4, which is printed by the printing device 1 according to the setting information in Figure 8.

[0081] The worker first performs step S1 to determine whether the fabric to be ultimately printed is cotton fabric M1 or polyester fabric M3. The worker can determine the material of the fabric from, for example, the blend ratio indicated on the fabric or a tag attached to the fabric.

[0082] If the final fabric to be printed is cotton fabric M1 (S1: cotton fabric), the operator performs step S2, which involves placing the cotton fabric M1 on the placement unit 10 and transmitting the setting information to the printing device 1. Similarly, if the final fabric to be printed is polyester fabric M3 (S1: polyester fabric), the operator performs step S3, which involves placing the transfer sheet M2 on the placement unit 10 and transmitting the setting information to the printing device 1.

[0083] After either process S2 or process S3, the printing device 1 performs process S4, which prints according to the setting information. Specifically, as shown in Figure 9, first, the acquisition unit 42a of the control unit 40 performs process S41, which acquires the setting information via the communication unit 43.

[0084] Next, the selection unit 42b performs step S42, which determines whether the printing medium placed on the placement unit 10 is cotton fabric M1 or transfer sheet M2, based on the setting information.

[0085] In step S42, if the selection unit 42b determines that the printing medium placed on the placement unit 10 is cotton fabric M1 (S42: cotton fabric), it performs step S43 to select the first mode. Next, the selection unit 42b performs step S44 to further select whether or not to use white ink based on the setting information.

[0086] In step S44, if the selection unit 42b selects to use white ink (S44: YES), it performs step S44a, which selects and executes the first sub-mode. As a result, the first background layer Pw1 and the first image layer Pc1 are formed on the cotton fabric M1 in that order. In step S44, if the selection unit 42b selects not to use white ink (S44: NO), it performs step S44b, which selects and executes the second sub-mode. As a result, the first image layer Pc1 is formed on the cotton fabric M1. Thus, an image corresponding to the image data of the setting information is printed on the cotton fabric M1. Printing on the cotton fabric M1 is now complete.

[0087] Furthermore, in step S42, if the selection unit 42b determines that the printing medium placed on the placement unit 10 is a transfer sheet M2 (S42: transfer sheet), it performs step S45 to select the second mode. Next, the selection unit 42b performs step S46 to further select whether or not to use white ink based on the setting information.

[0088] In step S46, if the selection unit 42b selects to use white ink (S46: YES), it performs step S46a, which selects and executes the third sub-mode. As a result, the second image layer Pc2, the second background layer Pw2, and the adhesive layer Pg2 are formed on the transfer sheet M2 in that order. In step S46, if the selection unit 42b selects not to use white ink (S46: NO), it performs step S46b, which selects and executes the fourth sub-mode. As a result, the second image layer Pc2 and the adhesive layer Pg2 are formed on the transfer sheet M2 in that order. As a result, an inverted image of the image data of the setting information is printed on the transfer sheet M2.

[0089] Next, as shown in Figure 8, the operator removes the printed transfer sheet M2 from the printing device 1 and places it in the dryer, and the dryer performs step S5 in which it dries the printed transfer sheet M2.

[0090] Next, the operator removes the dried transfer sheet M2 from the dryer and places it in the transfer machine. The transfer machine then performs step S6, which transfers the second image layer Pc2 of the dried transfer sheet M2 onto the polyester fabric M3. Specifically, the adhesive layer Pg2 of the transfer sheet M2 is attached to the polyester fabric M3 and heat-pressed. This heat-weldes the adhesive layer Pg2 to the polyester fabric M3. Next, the transfer sheet M2 is peeled off the second image layer Pc2. As a result, the image data of the setting information is printed onto the polyester fabric M3. The printing onto the polyester fabric M3 is now complete.

[0091] Although the printing apparatus 1 and printing method according to this embodiment have been described above, the printing apparatus 1 and printing method are not limited to those described above.

[0092] For example, unlike this embodiment, it is possible to select whether or not to use white ink in either the first mode or the second mode, and to configure the system to always use white ink in the other mode. Alternatively, it is possible to select whether or not to use white ink in either the first mode or the second mode, and to configure the system to never use white ink in the other mode.

[0093] Alternatively, for example, the printing apparatus 1 may be equipped with a detector that acquires detection data capable of identifying the material of the printing medium placed on the mounting section 10. The acquisition section 42a acquires detection data from the detector, and the selection section 42b identifies the material of the printing medium based on the acquired detection data and selects a mode according to the identification result. The detector is not particularly limited as long as it can acquire detection data capable of identifying whether it is cotton fabric M1 or a transfer sheet M2, but examples include a camera that images the printing medium, an optical detector using laser light as a light source, a capacitance sensor, and an electrical resistance meter. In this case, the material of the printing medium can be identified from the surface properties, degree of gloss, thickness, etc.

[0094] In this case, if the detection data determines that the printing medium is polyester fabric M3, the system may notify the user to replace the polyester fabric M3 placed on the placement unit 10 with the transfer sheet M2. The notification may be made by the notification unit of the printing device 1, which is provided on the printing medium to notify the user of information by sound or display, or by the notification unit of the user's operating terminal 2 if the operating terminal 2 is provided with a notification unit.

[0095] Furthermore, the printing apparatus 1 may incorporate a dryer for drying the transfer sheet M2, a transfer machine for transferring the transfer sheet M2 onto the polyester fabric M3, and the like.

[0096] As described above, the printing apparatus 1 according to this embodiment includes a placement section 10 on which a cotton fabric M1 or a transfer sheet M2 is selectively placed, a printing section 30 capable of discharging image-forming ink and adhesive liquid, respectively, and a control unit 40 that controls the operation of the printing section 30. The control unit 40 has a selection section 42b that selects between a first mode and a second mode. In the first mode, the operation of the printing section 30 is controlled to discharge image-forming ink toward the cotton fabric M1 placed on the placement section 10 to form a first image layer Pc1. In the second mode, the operation of the printing section 30 is controlled to discharge image-forming ink toward the transfer sheet M2 placed on the placement section 10 to form a second image layer Pc2, and after the formation of the second image layer Pc2, adhesive liquid is discharged toward the second image layer Pc2 to form an adhesive layer Pg2.

[0097] Thus, by printing on cotton fabric M1 using the first mode, the print image's durability and texture can be improved. Furthermore, for fabrics with relatively high hydrophobicity, such as polyester fabric M3, printing is first performed on transfer sheet M2 using the second mode, and then the printed image from transfer sheet M2 is transferred to the fabric, which also improves the print image's durability and texture. Therefore, when fabrics such as cotton fabric M1 and polyester fabric M3 are washed, it is possible to suppress defects such as cracking and peeling of the image. In other words, it is possible to achieve both the durability of the print image and the good texture of the fabric in the printed area, depending on the material of the fabric being printed on.

[0098] Furthermore, the printing unit 30 is capable of ejecting white ink. The selection unit 42b allows further selection of whether or not to use white ink when the first mode is selected. In the first mode, if white ink is used, the printing unit 30 ejects white ink toward the cotton fabric M1 and then forms the first image layer Pc1. The selection unit 42b allows further selection of whether or not to use white ink when the second mode is selected. In the second mode, if white ink is used, the printing unit 30 forms the second image layer Pc2 and then ejects white ink toward the second image layer Pc2.

[0099] Thus, since it is possible to choose whether or not to use white ink in both the first and second modes, the design freedom of images that can be printed on the printing medium is increased. In addition, when white ink is used, the color reproduction of the first image layer Pc1 and the second image layer Pc2 can be enhanced.

[0100] Furthermore, the amount of white ink W1 impregnated into the cotton fabric M1 in the first mode is greater than the amount of white ink W2 impregnated into the transfer sheet M2 in the second mode. In the first mode, the time interval Δt1 from the completion of white ink ejection to the start of image-forming ink ejection is longer than the time interval Δt2 from the completion of white ink ejection to the start of adhesive liquid ejection in the second mode.

[0101] Thus, for cotton fabric M1 with relatively high water absorption, by increasing the amount of white ink W1 applied and increasing the time interval Δt1, it is possible to ensure the thickness of the first background layer Pw1 formed on the cotton fabric M1 while sufficiently removing the solvent from the white ink applied to the cotton fabric M1. On the other hand, for transfer sheet M2 with relatively low water absorption, by decreasing the amount of white ink W2 applied and decreasing the time interval Δt2, it is possible to reduce the amount of white ink used and shorten the printing time.

[0102] The printing unit 30 also has an inkjet head 31 that ejects image-forming ink and adhesive liquid. The inkjet head 31 is movable relative to the mounting unit 10 in the main scanning direction a2 and the sub-scanning direction a3 that intersects the main scanning direction a2. In the second mode, the inkjet head 31 ejects ink in both the forward and return paths of the sub-scanning direction a3. Therefore, printing time can be shortened.

[0103] The adhesive also contains polyester. Therefore, the adhesive layer Pg2 has high affinity with the polyester fabric M3. As a result, when the second image layer Pc2 is transferred from the transfer sheet M2 to the polyester fabric M3, the second image layer Pc2 can be firmly bonded to the polyester fabric M3 by the adhesive layer Pg2. Consequently, the fastness of the printed image on the polyester fabric M3 is improved.

[0104] The printing method according to this embodiment identifies whether the printing medium placed on the mounting unit 10 is a cotton fabric M1 or a transfer sheet M2. If the printing medium placed on the mounting unit 10 is a cotton fabric M1, a first mode is selected and executed in which image-forming ink is ejected from the printing unit 30 toward the cotton fabric M1 to form a first image layer Pc1. If the printing medium placed on the mounting unit 10 is a transfer sheet M2, a second mode is selected and executed in which image-forming ink is ejected from the printing unit 30 toward the transfer sheet M2 to form a second image layer Pc2, and adhesive liquid is ejected toward the second image layer Pc2 to form an adhesive layer Pg2.

[0105] Therefore, depending on the material of the fabric to be printed, it is possible to achieve both the fastness of the printed image and the good texture of the fabric in the printed area.

[0106] Furthermore, after performing the second mode on the transfer sheet M2 placed on the mounting section 10, the transfer sheet M2 is dried, the adhesive layer Pg2 of the transfer sheet M2 is attached to the polyester fabric M3, and the second image layer Pc2 is transferred to the polyester fabric M3. Therefore, the print quality and texture of the polyester fabric M3 can be improved.

[0107] <Second Embodiment> Figure 10 is a cross-sectional view showing a portion of the transfer sheet M2 that has been printed using the printing apparatus 1 according to the second embodiment.

[0108] The printing apparatus 1 and printing method according to this embodiment differ from the printing apparatus 1 and printing method according to the first embodiment in that, when using white ink in the second mode, i.e., in the third sub-mode, the printing unit 30 ejects the white ink and adhesive liquid at the same timing. In this embodiment, the differences from the first embodiment will be mainly described, and the same components and methods as in the first embodiment will be denoted by the same reference numerals, and their descriptions will be omitted as appropriate.

[0109] In the third sub-mode, the drive control unit 42c controls the operation of the printing unit 30 to eject the white ink and adhesive liquid at the same time. The drive control unit 42c also controls the operation of the printing unit 30 to eject the white ink and adhesive liquid respectively so that the areas where the white ink is applied and the areas where the adhesive liquid is applied overlap in a plan view. Here, "same timing" means substantially the same timing, and it is sufficient that the time periods when the two ejected liquids are ejected overlap at least partially. Here, "overlapping adhesion areas" includes not only cases where the two adhesion areas completely overlap, but also cases where the two adhesion areas overlap, but one of the two adhesion areas extends beyond the other. Therefore, as shown in Figure 10, a white adhesive layer Pg22 composed of white ink and adhesive liquid is formed on the second image layer Pc2. In other words, in this embodiment, the adhesive layer Pg22 combines the function of an adhesive layer and the function of a second background layer. This allows for a thinner overall layer thickness compared to the case where the adhesive layer Pg2 and the second background layer Pw2 are formed separately, as shown in Figure 3. As a result, it contributes to improving the durability of the printed image.

[0110] In this embodiment, as in the first embodiment, it is possible to ensure both the durability of the printed image and the good texture of the fabric in the printed area, depending on the material of the fabric to be printed on.

[0111] Furthermore, when using white ink in the second mode, the printing unit 30 ejects the white ink and adhesive liquid at the same time, so that the area where the white ink is applied and the area where the adhesive liquid is applied overlap in a plan view.

[0112] In the second mode, when using white ink, the number of ejected liquids increases, but by ejecting the white ink and adhesive liquid at the same time, printing can be performed efficiently and printing time can be shortened. In addition, since the adhesive layer Pg22 combines the functions of both an adhesive layer and a second background layer, the overall layer thickness can be reduced, contributing to improved print image durability.

[0113] Although the printed apparatus and printing method according to the present invention have been described in detail using the illustrated embodiments, the present invention is not limited to these embodiments. Each part and each process constituting the printed apparatus and printing method can be replaced with any configuration and process that can perform similar functions. Furthermore, the printed apparatus and printing method may have additional components and processes. [Explanation of Symbols]

[0114] 1…Printing device, 2…Operation terminal, 10…Mounting unit, 11…Mounting base, 12…Support unit, 20…Base, 21…Main unit, 22…Guide unit, 30…Printing unit, 31…Inkjet head, 31c…Ejection unit, 31g1…First ejection unit, 31g2…Second ejection unit, 31k…Ejection unit, 31m…Ejection unit, 31w1…First ejection unit, 31w2…Second ejection unit, 31y…Ejection unit, 32…Carriage, 32c…Nozzle group, 32g1…First nozzle group, 32g2…Second nozzle group, 32k…Nozzle group, 32m…Nozzle group, 32w1…First nozzle group, 32w2…Second nozzle group, 32y…Nozzle group, 40…Control unit, 41…Storage unit, 42…Processing unit, 42a…Acquisition 42b...Selection unit, 42c...Drive control unit, 43...Communication unit, 50...Housing, 51...Internal space, 52...Opening, M1...Cotton fabric, M2...Transfer sheet, M3...Polyester fabric, Pc1...First image layer, Pc2...Second image layer, Pg2...Adhesive layer, Pg22...Adhesive layer, Pw1...First background layer, Pw2...Second background layer, S1...Process, S2...Process, S3...Process, S4...Process, S41...Process, S42...Process, S43...Process, S44...Process, S44a...Process, S44b...Process, S45...Process, S46...Process, S46a...Process, S46b...Process, S5...Process, S6...Process, a1...Arrow, a2...Main scanning direction, a3...Sub-scanning direction, a4...Scanning path

Claims

1. A mounting section on which cotton fabric or a transfer sheet is selectively placed, A printing unit capable of dispensing image-forming ink and adhesive liquid, A control unit that controls the operation of the printing unit, Equipped with, The control unit, A first mode involves controlling the operation of the printing unit to eject the image-forming ink toward the cotton fabric placed on the aforementioned mounting unit to form a first image layer, A second mode involves controlling the operation of the printing unit to eject the image-forming ink toward the transfer sheet placed on the aforementioned mounting unit to form a second image layer, and after the formation of the second image layer, ejecting the adhesive liquid toward the second image layer to form an adhesive layer. A printing apparatus characterized by having a selection unit for selecting [a specific item].

2. The printing unit is capable of further ejecting white ink, When the first mode is selected, the selection unit further allows the user to choose whether or not to use the white ink. In the first mode, when the white ink is used, the printing unit ejects the white ink toward the cotton fabric and then forms the first image layer. When the second mode is selected, the selection unit further allows the user to choose whether or not to use the white ink. The printing apparatus according to claim 1, wherein, when the white ink is used in the second mode, the printing unit ejects the white ink toward the second image layer after forming the second image layer.

3. The printing apparatus according to claim 2, wherein, in the second mode, when the white ink is used, the printing unit ejects the white ink and the adhesive liquid at the same time, so that in a plan view, the area where the white ink is attached and the area where the adhesive liquid is attached overlap.

4. The amount of white ink impregnated into the cotton fabric in the first mode is greater than the amount of white ink impregnated into the transfer sheet in the second mode. The printing apparatus according to claim 2, wherein in the first mode, the time interval from the completion of ejection of the white ink to the start of ejection of the image forming ink is longer than the time interval from the completion of ejection of the white ink to the start of ejection of the adhesive liquid in the second mode.

5. The printing unit has an inkjet head that ejects the image-forming ink and the adhesive liquid, The inkjet head is movable relative to the aforementioned mounting portion in the main scanning direction and the sub-scanning direction intersecting the main scanning direction. The printing apparatus according to any one of claims 1 to 3, wherein the inkjet head performs ejection in the forward and return paths of the sub-scanning direction in the second mode.

6. The printing apparatus according to any one of claims 1 to 3, wherein the adhesive liquid contains polyester.

7. Identify whether the printing medium placed on the mounting section is cotton fabric or a transfer sheet. If the printing medium placed on the mounting unit is the cotton fabric, a first mode is selected and executed in which image-forming ink is ejected from the printing unit toward the cotton fabric to form a first image layer. A printing method characterized in that, when the printing medium placed on the mounting portion is the transfer sheet, a second mode is selected and executed in which the image-forming ink is ejected from the printing portion toward the transfer sheet to form a second image layer, and an adhesive liquid is ejected toward the second image layer to form an adhesive layer.

8. After performing the second mode on the transfer sheet placed on the mounting section, The transfer sheet is dried, The printing method according to claim 7, comprising attaching the adhesive layer of the transfer sheet to a polyester fabric and transferring the second image layer to the polyester fabric.

Images