Three-dimensional pattern printed matter and method for producing same

Abstract

The present invention is a method for producing a three-dimensional pattern printed matter that has one or a plurality of three-dimensional printed parts formed in an island configuration on the surface of a flexible sheet-form substrate. The present invention includes a process for producing this three-dimensional printed part, comprising: a first step for forming a first ink layer having a prescribed planar shape on the surface of the substrate by inkjet printing using a first ultraviolet-curable resin ink, and curing at least the surface side of the first ink layer by irradiating ultraviolet light from the surface side of the first ink layer; and a second step for forming a second ink layer having the same planar shape as the first ink layer and a smaller area than the first ink layer by inkjet printing on the surface of the first ink layer using a second ultraviolet-curable resin ink, and curing at least the surface side of the second ink layer by irradiating ultraviolet light from the surface side of the second ink layer.

Description

Three-dimensional pattern printed matter and its manufacturing method

[0001] The present invention relates to a three-dimensional pattern printed matter and a method for producing the same.

[0002] For the purpose of improving design, it has been common practice to form a pattern on the surface of a sheet-like substrate by embossing the substrate. The embossing process uses an embossing device equipped with an embossing roll having a molding surface on which recesses and protrusions corresponding to the pattern are formed, and a backup roll disposed opposite the embossing roll. In the embossing device, the sheet-like substrate is passed between the embossing roll and the backup roll, and the molding surface of the embossing roll is pressed firmly against the surface of the substrate, thereby transferring the recesses and protrusions on the molding surface as a pattern to the surface of the substrate (Patent Document 1).

[0003] Japanese Patent Application Laid-Open No. 2012-152986

[0004] In embossing, the irregularities on the molding surface of an embossing roll are transferred to the surface of a substrate, thereby forming a pattern on the surface. If the difference in height between the irregularities is large, the outline of the pattern transferred to the substrate will stand out clearly, while if the difference in height between the irregularities is small, the pattern transferred to the substrate will be flat. However, it is difficult to transfer small letters or patterns to the substrate with good reproducibility using embossing. Furthermore, since irregularities with a depth and height greater than the thickness of the substrate cannot be transferred to the substrate, there is a problem in that it is difficult to form a clear pattern by embossing when the substrate is thin.

[0005] The problem to be solved by the present invention is to provide a technique for forming a picture or pattern consisting of projections and depressions of various heights and sizes on the surface of a substrate.

[0006] One aspect of the present invention, which has been made to solve the above-mentioned problems, is a method for producing a three-dimensional pattern printed matter having one or more three-dimensional printed portions formed in an island shape on the surface of a flexible sheet-like substrate, the method comprising the steps of: a first step of forming a first ink layer of a predetermined planar shape on the surface of the substrate by inkjet printing using a first ultraviolet-curing resin ink, and curing at least the surface side of the first ink layer by irradiating ultraviolet light from the surface side of the first ink layer; and a second step of forming a second ink layer of the same planar shape as the first ink layer but with a smaller area than the first ink layer by inkjet printing using a second ultraviolet-curing resin ink on the surface of the first ink layer, and curing at least the surface side of the second ink layer by irradiating ultraviolet light from the surface side of the second ink layer.

[0007] In the method for manufacturing a three-dimensional printed matter according to the above embodiment, three-dimensional printed portions are formed in an island shape on the surface of a flexible sheet-like substrate through a manufacturing process including a first step and a second step. Forming three-dimensional printed portions in an island shape means that each three-dimensional printed portion is large enough to occupy a portion of the surface of the substrate. Therefore, when a single three-dimensional printed portion is formed on the surface of the substrate, the three-dimensional printed portion will naturally cover only a portion of the surface of the substrate. Each three-dimensional printed portion needs only to be large enough to occupy a portion of the surface of the substrate. When multiple three-dimensional printed portions are formed on the surface of the substrate, the entire surface of the substrate may be covered by these multiple three-dimensional printed portions. Furthermore, when multiple three-dimensional printed portions are formed on the surface of the substrate, the multiple three-dimensional printed portions may be scattered across the entire surface of the substrate or may be concentrated in a portion of the surface of the substrate. When multiple three-dimensional printed portions are formed on the surface of the substrate, the appearance of the three-dimensional printed matter varies depending on how the multiple three-dimensional printed portions are arranged, allowing for the production of three-dimensional printed matter with a wide variety of designs.

[0008] In the method for producing a three-dimensional pattern printed matter of the above aspect, a first ink layer is formed on the surface of a sheet-like substrate by inkjet printing using an ultraviolet-curable resin ink, and a second ink layer is further formed on top of the first ink layer. The first and second ultraviolet-curable resin inks used to form the first and second ink layers may be the same or different in color, composition, etc. Furthermore, the first and second ultraviolet-curable resin inks may be transparent inks (clear inks) that do not contain a colorant.

[0009] The first ink layer and the second ink layer have the same planar shape, and the second ink layer has a smaller area than the first ink layer. The first ink layer and the second ink layer may be laminated so that their centers coincide with each other, or so that their centers are offset. Even when the layers are laminated so that their centers are offset, it is preferable that the second ink layer be formed on at least the surface of the first ink layer so that it fits within the surface of the first ink layer.

[0010] The flexible sheet-like substrate may be any substrate that can be printed with ultraviolet-curable resin ink, and examples of the material include synthetic leather, natural leather, knitted fabric, woven fabric, synthetic resin, paper, etc. Furthermore, the thickness of the sheet-like substrate is not limited as long as it is flexible, and thin film substrates (films) and flat plate substrates (plates) are also included in the sheet-like substrate.

[0011] In the first step of the manufacturing process for the three-dimensional printed part, a first ink layer is formed by inkjet printing using a first ultraviolet-curable resin ink on the surface of the substrate, and then ultraviolet light is irradiated onto the surface of the first ink layer. During this process, the amount of ultraviolet light incident on the surface side of the first ink layer is greater than that on the substrate side, so the polymerization reaction of the first ultraviolet-curable resin ink on the surface side proceeds faster than the polymerization reaction of the first ultraviolet-curable resin ink on the substrate side. Furthermore, since the substrate side of the first ink layer is fixed to the substrate, while the surface side is free and unfixed, the ultraviolet-curable resin ink on the surface side hardens through the polymerization reaction, resulting in a larger volume on the surface side than on the substrate side. As a result, stress is generated within the first ink layer from the substrate side to the surface side, causing the first ink layer to bend toward the surface, resulting in a raised deformation of the sheet-like substrate. The magnitude of the raised deformation of the sheet-like substrate corresponds to the degree of flexibility of the substrate.

[0012] In the second step following the first step, a second ink layer is formed by inkjet printing using a second ultraviolet-curable resin ink on the surface of the first ink layer, and then the surface of the second ink layer is irradiated with ultraviolet light. At this time, as with the first ink layer, the volume of the second ink layer is relatively larger on the surface side than on the substrate side (the first ink layer side). As a result, the second ink layer curves toward the surface, causing the first ink layer and the substrate to bulge and deform. As a result, island-shaped 3D printed portions are formed in the areas of the substrate where the first ink layer and the second ink layer are formed. In other words, the 3D printed portions are formed by the bulging deformation of the first and second ink layers as well as the 1st and 2nd ink layers and the substrate. In particular, when the sheet-like substrate is a flexible substrate such as a vinyl chloride sheet or a synthetic leather sheet, the 1st ink layer and the 2nd ink layer curve toward the surface, causing the entire area of ​​the substrate where the first ink layer and the 2nd ink layer are formed to bulge and deform. Therefore, the contours of the 3D printed portions formed on the surface of the substrate are relatively clear.

[0013] The ink layers constituting the three-dimensional print section are not limited to two layers, the first and second ink layers, but may be one or more ink layers (hereinafter referred to as the third ink layer) laminated on the second ink layer. The process of forming the third ink layer (hereinafter referred to as the third process) is similar to the first and second processes described above: after forming the third ink layer, ultraviolet light is irradiated from the surface side of the third ink layer to harden at least the surface side of the third ink layer. When the third ink layer is a multi-layer structure, the third process is performed as follows: For two of the multi-layer third ink layers that overlap one another, a lower third ink layer is formed, ultraviolet light is irradiated from the surface side of the lower third ink layer to harden at least the surface side of the lower third ink layer, and then an upper third ink layer is formed on top of it, and ultraviolet light is irradiated from the surface side of the upper third ink layer to harden at least the surface side of the upper third ink layer.

[0014] The intensity of the ultraviolet light irradiated onto each ink layer in the first to third steps is preferably 100% to 50% of the intensity required to cure the ultraviolet-curable resin ink that constitutes each ink layer. In this case, the intensity of the ultraviolet light irradiated onto each ink layer may be the same or different. When the ultraviolet light intensities are made different, it is preferable to make the intensity of the ultraviolet light irradiated onto the upper ink layer lower than the intensity of the ultraviolet light irradiated onto the lower ink layer, taking into consideration that the ultraviolet light irradiated onto the upper ink layer will enter the lower ink layer through the upper ink layer.

[0015] Furthermore, the area of ​​the surface of the substrate where the 3D printed portion is formed may be colored differently from the other areas. In this case, if the surface of the substrate is colored by inkjet printing using an ultraviolet resin ink containing a colorant, the series of operations from forming the 3D printed portion to coloring can be performed by inkjet printing.

[0016] In addition, the three-dimensional pattern printed matter of the present invention has a three-dimensional pattern including a first ink layer formed by inkjet printing using a first ultraviolet-curing resin ink on the surface of a flexible sheet-like substrate, and a second ink layer formed by inkjet printing using a second ultraviolet-curing resin ink on the surface of the first ink layer, the second ink layer having the same planar shape as the first ink layer but a smaller area than the first ink layer.

[0017] According to the present invention, a three-dimensional printed portion formed on a flexible sheet-like substrate causes the portion of the substrate on which the three-dimensional printed portion is formed to rise and deform, thereby forming a convex three-dimensional printed pattern on the surface of the sheet-like substrate.

[0018] FIG. 1A is a diagram showing a schematic configuration of a three-dimensional pattern printed matter according to an embodiment of the present invention, and FIG. 1B is a diagram showing a schematic configuration of a comparative example. FIG. 1B is an explanatory diagram of a first step of a method for manufacturing a three-dimensional pattern printed matter according to an embodiment of the present invention. FIG. 1C is an explanatory diagram of a second step of a method for manufacturing a three-dimensional pattern printed matter according to an embodiment of the present invention. FIG. 1D is a schematic diagram of specimens e to i used in test 2. FIG. 1E is a schematic diagram of laminates L-1, J-1, K-1, and N-1 used in test 2. Photographs showing examples of manufacturing three-dimensional pattern printed matters.

[0019] An embodiment of the present invention will be described with reference to the drawings. FIG. 1( a) shows a schematic configuration of a three-dimensional pattern printed matter according to this embodiment. As shown in this figure, the three-dimensional pattern printed matter 1 includes a flexible sheet-like substrate 2 and an island-shaped three-dimensional printed portion 3 including a plurality of ink layers 30 formed on the surface 21 of the substrate 2. While FIG. 1( a) shows an example in which a single three-dimensional printed portion 3 is formed on the surface of the substrate 2, multiple ink layers 30 may also be formed on the surface of the substrate 2. Each of the ink layers 30 constituting the three-dimensional printed portion 3 is formed by printing with a predetermined ultraviolet-curable resin ink using an inkjet printer.

[0020] As will be described in detail later, in the three-dimensional pattern printed matter 1, the three-dimensional printed portion 3 is formed on the surface 21 of the substrate 2, causing the region of the substrate 2 where the three-dimensional printed portion 3 is formed to be raised and deformed along with the three-dimensional printed portion 3. Therefore, the height of the top of the portion of the substrate 2 where the three-dimensional printed portion 3 is formed (i.e., the height of the three-dimensional printed portion 3) is the sum of the thickness h1 of the multiple ink layers 30 and the raised height h2. In the comparative printed matter 1A, in which only the multiple ink layers 30 are formed on the surface 21 of the substrate 2 (i.e., no raised deformation occurs), as shown in FIG. 1( b), the height of the three-dimensional printed portion 3A is the same as the thickness h1 of the multiple ink layers 30. In comparison, the height of the three-dimensional printed portion 30 in the three-dimensional pattern printed matter 1 of this embodiment is greater by the raised height. Furthermore, while the top surface of the three-dimensional printed portion 3A in the printed matter 1A is flat, the top surface of the three-dimensional printed portion 3 in the three-dimensional pattern printed matter 1 is curved, allowing for a more varied three-dimensional pattern to be formed compared to the printed matter 1A.

[0021] Next, a method for producing a three-dimensional pattern printed matter according to this embodiment will be described with reference to Figures 2 and 3. In the method for producing a three-dimensional pattern printed matter according to this embodiment, a plurality of ink layers 30 (hereinafter referred to as a first ink layer 31, a second ink layer 32, etc. from the bottom up) are formed in order on the surface of a sheet-like substrate 2 by inkjet printing using ultraviolet curable resin ink. This forms a laminate in which a plurality of ink layers are stacked.

[0022] Specifically, the first ink layer 31 is formed by inkjet printing a first ultraviolet-curable resin ink on the surface 21 of the substrate 2 ( FIG. 2( a)). Then, ultraviolet light is irradiated onto the surface of the first ink layer 31. At this time, the amount of ultraviolet light incident on the surface side of the first ink layer 31 is greater than that on the substrate 2 side, so the polymerization reaction of the first ultraviolet-curable resin ink on the surface side proceeds relatively faster than the polymerization reaction of the first ultraviolet-curable resin ink on the substrate 2 side. Furthermore, while the substrate 2 side of the first ink layer 31 is fixed to the substrate 2, the surface side is not fixed anywhere and is in a free state, so the polymerization reaction of the ultraviolet-curable resin ink on the surface side proceeds in various directions. As a result, the volume of the first ink layer 31 is relatively larger on the surface side than on the substrate 2 side, and stress is generated within the ink layer on the surface side from the substrate side to the surface side. This causes the first ink layer 31 to curve toward the surface, and the substrate 2 to which the underside of the first ink layer 31 is fixed rises and deforms in response to the first ink layer 31, so that the height h4 of the three-dimensional printed portion becomes larger than the thickness h3 of the first ink layer 31 (Figure 2(b)).

[0023] Next, a second ink layer 32 is formed by inkjet printing using a second ultraviolet-curable resin ink on the surface of the curved first ink layer 31 ( FIG. 3( a) ). The surface of the second ink layer 32 is then irradiated with ultraviolet light. As with the first ink layer 31, the polymerization reaction of the ultraviolet-curable resin ink in the second ink layer 32 proceeds relatively faster on the surface side than on the substrate 2 side (the first ink layer 31 side). As a result, the volume of the second ink layer 32 is relatively larger on the surface side than on the substrate 2 side. This causes the second ink layer 32 to curve toward the surface, and the first ink layer 31 and substrate 2 are raised and deformed accordingly, so that the height h6 of the three-dimensionally printed portion becomes larger than the height h5 before the raised portion ( FIG. 3( b) ).

[0024] In this case, since the second ink layer 32 has a smaller area than the first ink layer 31 and a larger radius of curvature (smaller curvature) than the first ink layer, theoretically the amount of protrusion caused by the second ink layer 32 will be smaller than the amount of protrusion caused by the first ink layer 31.

[0025] Next, several tests were conducted to verify the phenomena that occur when forming 3D printed portions on a flexible sheet-like substrate. <Test 1> In Test 1, the relationship between the amount of UV light irradiated on an ink layer formed on a flexible sheet-like substrate and the degree of curing was investigated. Specifically, a single ink layer of the same shape and area (specifically, a circular ink layer with a diameter of 3.5 cm) was formed on the surface of the substrate by inkjet printing using a UV-curable resin ink, and each was irradiated with different amounts of UV light.

[0026] The substrate, UV-curing resin ink, and inkjet printer used in the test are as follows: Substrate: Synthetic leather sheet (product name: PVC-8000) manufactured by Masuda Co., Ltd. This synthetic leather is a flexible synthetic leather sheet with a thickness of 1.2 mm, consisting of a base fabric made of a 1-way knit blend of 65% polyester and 35% rayon, and a surface layer made of 100% polyvinyl chloride (PVC). UV-curing resin ink: LUS-120 ink manufactured by Mimaki Engineering Co., Ltd. Inkjet printer: Flatbed UV printer "JFX-200-2513EX" (Mimaki Engineering Co., Ltd.) was used.

[0027] The UV irradiation intensity recommended by the UV-curable resin ink manufacturer was 100% (100% irradiation intensity = standard equipment setting value), and the UV irradiation intensity was set to four levels: 100% (hereinafter: test piece a), 75% (hereinafter: test piece b), 50% (hereinafter: test piece c), and 25% (hereinafter: test piece d). The irradiation time was 10 minutes. The substrate shape was observed immediately after UV irradiation (when printing was completed), 48 hours after UV irradiation began, and 72 hours after UV irradiation began. Note that 48 hours after UV irradiation began corresponds to the time required for the polymerization reaction of the polymerizable components contained in the UV-curable resin ink to be nearly complete.

[0028] As a result of the above experiment, there was no difference in appearance between test specimen a and test specimen b upon completion of printing, and the ink layer on both specimens cured to form a cured coating. When comparing the feel of the cured coating on test specimen a and test specimen b, test specimen b had a slightly more tacky coating surface than test specimen a. In addition, test specimen b had a stronger odor than test specimen a. As the odor disappeared as the curing progressed, it was determined that the curing reaction of test specimen b was insufficient. When observed 48 hours after the start of UV irradiation, the tackiness of test specimen b had disappeared, but the odor of test specimen b did not diminish compared to test specimen a, either at 48 hours or 78 hours.

[0029] Furthermore, in specimens a and b, the cured coating film caused deformation of the substrate, and in both cases the degree to which the substrate bulged due to the cured coating film increased in proportion to the time elapsed since printing was completed. For specimen a, the bulging deformation of the substrate had almost stopped after 24 hours, and for specimen b, the bulging deformation of the substrate had almost stopped after 72 hours. Because the bulging deformation of the substrate had occurred for a longer period of time, the degree of bulging after 72 hours was greater for specimen b than for specimen a.

[0030] On the other hand, the surface condition and odor of specimens c and d indicated that both were uncured at the time of printing completion. For specimen c, numerous bubbles appeared on the surface of the ink layer within approximately five minutes of printing completion. These bubbles expanded over time, and after approximately 12 hours, they combined and burst. Furthermore, after approximately 24 hours, a sponge-like component from the ink layer naturally peeled off. Specimen d also showed similar bubbles to specimen c, but most of the ink layer was not cured, and no noticeable changes in appearance were observed either approximately one hour after printing completion or 72 hours after printing completion.

[0031] From the above results, it was found that the mechanical action exerted on the substrate by the cured coating film is the difference in volume change between the surface side and the substrate side as the ink layer hardens, specifically the stress caused by the relative expansion of the volume of the ink layer on the surface side relative to the ink layer on the substrate side, and that the rate at which the volume change progresses varies depending on the amount of ultraviolet light irradiated on the ink layer.

[0032] <Test 2> Next, Test 2 was conducted to verify the change in prominence of the substrate depending on the number of layers in a laminate of multiple ink layers when the 3D printed portion is composed of a laminate of multiple ink layers. The substrate was the same as the substrate (synthetic leather sheet) used in Test 1. In Test 2, ink layers with thicknesses of 30 to 40 μm and the following shapes were formed on the surface of the substrate by inkjet printing using ultraviolet-curing resin ink, and each ink layer was irradiated with ultraviolet light at 100% irradiation intensity for 10 minutes to form a cured coating. The ink layers (cured coatings) of each shape are referred to as Test Specimens e to i. Test Specimen e: 10 mm diameter circle Test Specimen f: 12 mm diameter circle Test Specimen g: 14 mm diameter circle Test Specimen h: 16 mm diameter circle Test Specimen i: 18 mm diameter circle

[0033] As shown in Figure 4, test specimens e to i were formed side by side on the surface of a single substrate 2. The appearances of test specimens with 1, 3, and 6 ink layer stacks were observed, yielding the following results: Layer count 1: No protrusion due to substrate deformation was observed in any of the test specimens, and only an increase in thickness due to the volume of the cured coating was observed. Layer count 3: Protrusion due to substrate deformation was observed in all test specimens. The protrusion height due to substrate deformation, excluding the thickness of the cured coating (the length corresponding to h1 + h2 in Figure 1), was approximately 0.3 mm in all test specimens, and no difference in protrusion height was observed between test specimens. Layer count 6: Protrusion due to substrate deformation was observed in all test specimens, and the protrusion height increased in proportion to the increase in area. The protrusion heights for each test specimen were as follows: Test specimen e: Approximately 0.5 mm Test specimen f: Approximately 0.5 mm Test specimen g: Approximately 0.7 mm Test specimen h: Approximately 1.0 mm Test specimen i: Approximately 1.2 mm

[0034] Next, four types of laminates L-1, J-1, K-1, and N-1 were formed by stacking some of the specimens e to i in descending order of area. The laminates L-1, J-1, K-1, and N-1 were formed by forming an ink layer by inkjet printing using ultraviolet-curable resin ink and then curing it, a process that was repeated multiple times.

[0035] As shown in the upper part of Figure 5(a), laminate L-1 has a configuration in which five types of laminates, test specimens i, h, g, f, and e, are stacked on substrate 2 with their centers aligned in this order. The substrate 2 on which such laminate L-1 was formed had a raised area where laminate L-1 was formed, with a maximum height of approximately 0.9 mm. The lower part of Figure 5(a) is a cross-sectional view of region L-2 of substrate 2 where laminate L-1 was formed. As can be seen from this figure, the substrate L-2 in the laminate-forming area was deformed into an embossed shape, forming gentle staircases at roughly the same rate starting from the boundary lines of each ink layer.

[0036] Furthermore, although not shown, when the shape of each layer of the laminate was changed from a circle to a regular square, equilateral triangle, ellipse, or rhombus, as long as the lamination ratio and number of layers were maintained, a rounded, step-like embossed deformation was observed, similar to that of substrate L-2. This demonstrates that a laminate in which multiple cured coating films are laminated so that the area decreases stepwise raises the substrate, regardless of the shape of the cured coating film (ink layer).

[0037] Furthermore, the following two types of laminates were fabricated, and the changes in shape were compared. A nine-layer laminate consisting of three layers of each of specimens g, h, and i (hereafter referred to as laminate J-1, see the top row of Figure 5(b)). A nine-layer laminate consisting of three layers of each of specimens e, f, and i (hereafter referred to as laminate K-1, see the top row of Figure 5(c)). Both laminates were stacked in order of area, from largest to smallest, with the centers of the specimens aligned. As a result, a conical protrusion approximately 1.5 mm in height was observed in the area of ​​the substrate where laminate J-1 was formed, and a conical protrusion approximately 1.2 mm in height was observed in the area where laminate K-1 was formed.

[0038] Comparing the cross-sections of the raised sections of each stack, we found that all of them had a stepped shape, starting near the boundary between a certain layer and the layer immediately above. Stack J-1 drew a gentle arc in accordance with the uniform area change from the bottom to specimen i → specimen h → specimen g, while stack K-1 formed a convex, non-uniform raised section with a significant angle change near the boundary between specimen i and specimen f (see J-2 and K-2 in the lower rows of Figures 5(b) and (c)).

[0039] From these results, it was found that even within a single raised body, the slope changes near the boundary line of the stacked ink layers (cured coating film). This suggests that by adjusting the positional relationship of the ink layers stacked one above the other, it is possible to control the cross-sectional shape and external shape of the 3D printed part in a sculptural manner. For example, Figure 5(d) shows an example in which a 3D printed part (laminate) is formed on a substrate by stacking multiple circular ink layers with their centers shifted. In this example, raised bodies with irregular cross sections other than conical shapes are obtained (see N-1 and N-2 in Figure 5(d)).

[0040] <Manufacturing Example> Figure 6 shows an example of a three-dimensional pattern printed product in which a three-dimensional printed portion is formed on a synthetic leather sheet by inkjet printing using ultraviolet-curable resin ink, and the surface is colored. This synthetic leather sheet is the same as that used in Test 1. Figure 6(b) is a photograph of an enlarged portion of Figure 6(a), and Figure 6(c) is a photograph of the back surface of the substrate. Figure 6(c) shows that the substrate has been deformed to a convex shape on the surface side.

[0041] In the example shown in Figure 6(a), an ink layer is formed on the surface of the 3D printed part by inkjet printing using ultraviolet curable resin ink, which is then cured to form a coating film and then colored. The cured coating film made from the ink layer forms protrusions and convex patterns on the surface of the 3D printed part, thereby decorating the surface of the 3D printed part and allowing the production of 3D pattern printed products with even more design and decorativeness.

[0042] REFERENCE SIGNS LIST 1... 3D pattern printed matter 2... Substrate 21... Surface 3... 3D printed portion 30... Ink layer 31... First ink layer 32... Second ink layer

Claims

1. A method for producing a three-dimensional patterned printed material having one or more three-dimensional printed areas formed in an island-like manner on the surface of a flexible sheet-like substrate, The first step involves forming a first ink layer with a predetermined planar shape on the surface of the substrate by inkjet printing using a first ultraviolet-curable resin ink, and curing at least the surface side of the first ink layer by irradiating it with ultraviolet light from the surface side. A second step is to form a second ink layer on the surface of the first ink layer by inkjet printing using a second ultraviolet-curable resin ink, the second ink layer having the same planar shape as the first ink layer but with a smaller area than the first ink layer, and to cure at least the surface side of the second ink layer by irradiating it with ultraviolet light from the surface side. A method for manufacturing a three-dimensional patterned printed material, comprising a manufacturing step of manufacturing the three-dimensional printed portion by including, deforming the first ink layer such that the surface side of the first ink layer is convex with respect to the substrate, and deforming the second ink layer such that the surface side of the second ink layer is convex with respect to the surface of the first ink layer.

2. A method for manufacturing a three-dimensional patterned printed material according to claim 1, further comprising a coloring step of coloring the region on the surface of the substrate in which the three-dimensional printed portion is formed.

3. In the method for manufacturing a three-dimensional patterned printed material according to claim 1, The manufacturing process of the three-dimensional printing section A method for manufacturing a three-dimensional patterned printed material, further comprising a third step of stacking one or more third ink layers on the surface of the second ink layer by inkjet printing using a third ultraviolet-curable resin ink, the third ink layers having the same planar shape as the second ink layer but with a smaller planar viewing area than the second ink layer.

4. In the method for manufacturing a three-dimensional patterned printed material according to claim 3, A method for manufacturing a three-dimensional patterned printed material, characterized in that, when the third ink layer is a plurality of layers, two of the plurality of third ink layers that overlap vertically form the lower third ink layer, irradiate it with ultraviolet light from its surface side to cure at least the surface side of the lower third ink layer, then form the upper third ink layer on top of it, irradiate it with ultraviolet light from its surface side to cure at least the surface side of the upper third ink layer.

5. In the method for manufacturing a three-dimensional patterned printed material according to claim 3, A method for manufacturing a three-dimensional patterned printed material, wherein when the third ink layer consists of multiple layers, the area of ​​the multiple layers decreases from the side closer to the second ink layer to the side further away.

6. The intensity of the ultraviolet light irradiated from the surface side of the first ink layer and the second ink layer is 100% to 50% of the intensity required for curing the first ultraviolet-curable resin ink. The method for manufacturing a three-dimensional patterned printed material according to claim 1, wherein in the second step, the intensity of the ultraviolet light irradiated from the surface side of the second ink layer is 100% to 50% of the intensity required for curing the second ultraviolet-curable resin ink.

7. The method for manufacturing a three-dimensional patterned printed article according to claim 1, wherein the intensity of the ultraviolet light irradiated from the surface side of the second ink layer in the second step is the same as or less than the intensity of the ultraviolet light irradiated from the surface side of the first ink layer in the first step.

8. The material has a three-dimensional pattern comprising a first ink layer formed by inkjet printing using a first ultraviolet-curable resin ink on the surface of a flexible sheet-like substrate, and a second ink layer formed by inkjet printing using a second ultraviolet-curable resin ink on the surface of the first ink layer, having the same planar shape as the first ink layer but with a smaller area than the first ink layer. A three-dimensional patterned printed material in which the first ink layer is deformed such that the surface side of the first ink layer is convex with respect to the surface of the substrate, and the second ink layer is deformed such that the surface side of the second ink layer is convex with respect to the surface of the first ink layer.