Three-dimensional patterned printed material and method for manufacturing the 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

Technical Field

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

Background Art

[0002] For the purpose of improving the design property, it has been conventionally carried out to form a pattern on the surface of a sheet-like base material by performing embossing on the base material. In embossing, an embossing device including an embossing roll having a molding surface on which concavo-convex corresponding to a pattern is formed and a backup roll disposed opposite to the embossing roll is used. In the embossing device, a sheet-like base material is passed between the embossing roll and the backup roll, and the concavo-convex of the molding surface of the embossing roll is strongly pressed against the surface of the base material, so that the concavo-convex is transferred to the surface of the base material as a pattern (Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In embossing, a pattern is formed on the surface by transferring the concavo-convex of the molding surface of the embossing roll to the surface of the base material. When the height difference of the concavo-convex is large, the contour of the pattern transferred to the base material clearly emerges, and when the height difference of the concavo-convex is small, the pattern transferred to the base material becomes flat. However, in embossing, it is difficult to transfer small characters and patterns to the base material with good reproducibility. Further, since concavo-convex having a depth and height greater than the thickness of the base material cannot be transferred to the base material, in the case of a base material having a small thickness, there is a problem that it is difficult to form a clear pattern by embossing.

[0005] The problem that this invention aims to solve is to provide a technology for forming patterns and designs on the surface of a substrate, consisting of irregularities of varying heights and sizes. [Means for solving the problem]

[0006] One aspect of the present invention, made to solve the above problems, is a method for producing a three-dimensional patterned printed material having one or more three-dimensional printed portions formed in an island-like manner on the surface of a flexible sheet-like substrate, A 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 having the same planar shape as the first ink layer but with a smaller area by inkjet printing on the surface of the first ink layer using a second ultraviolet-curable resin ink, and to cure at least the surface side of the second ink layer by irradiating it with ultraviolet light from the surface side. The invention has a manufacturing process for the three-dimensional printed section, which includes the manufacturing process for the three-dimensional printed section.

[0007] In the manufacturing method for a three-dimensional patterned printed material according to the above embodiment, a manufacturing process including the first and second steps forms island-like three-dimensional printed areas on the surface of a flexible sheet-like substrate. Forming the three-dimensional printed areas in island-like areas means that each three-dimensional printed area occupies a portion of the substrate's surface. Therefore, when one three-dimensional printed area is formed on the substrate's surface, it naturally covers only a portion of the substrate's surface. Each three-dimensional printed area only needs to occupy a portion of the substrate's surface; when multiple three-dimensional printed areas are formed on the substrate's surface, these multiple areas may cover the entire substrate surface. Furthermore, when multiple three-dimensional printed areas are formed on the substrate's surface, they may be scattered across the entire surface or concentrated in a portion of it. When multiple three-dimensional printed areas are formed on the substrate's surface, the arrangement of these areas will result in different appearances for the three-dimensional patterned printed material, enabling the production of diverse and aesthetically pleasing three-dimensional patterned printed materials.

[0008] In the method for manufacturing a three-dimensional patterned printed material according to the above embodiment, 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 it. The first ultraviolet-curable resin ink and the second ultraviolet-curable resin ink used to form the first and second ink layers may be the same in color, composition, etc., or they may be different. In addition, transparent inks (clear inks) that do not contain colorants may be used as the first and second ultraviolet-curable resin inks.

[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 and second ink layers may be laminated so that their center positions coincide, or they may be laminated so that their center positions are offset. Even when laminated so that their center positions are offset, it is preferable that the second ink layer be formed on the surface of the first ink layer so that it fits on at least the surface of the first ink layer.

[0010] Flexible sheet-like substrates can be any material that can be printed with UV-curing resin inks, and examples of such materials include synthetic leather, genuine leather, knitted fabrics, woven fabrics, synthetic resins, and paper. Furthermore, there are no restrictions on the thickness of the sheet-like substrate as long as it is flexible, and thin film substrates (films) and flat substrates (plates) are also included in the category of sheet-like substrates.

[0011] In the first step of the manufacturing process for the three-dimensional printing section, a first ink layer is formed on the surface of the substrate by inkjet printing using a first ultraviolet-curable resin ink, and then ultraviolet light is irradiated onto the surface of the first ink layer. At this time, since the amount of ultraviolet light incident on the surface side of the first ink layer is greater than that on the substrate side, 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, while the substrate side of the first ink layer is fixed to the substrate, the surface side is not fixed anywhere and is in a free state. As a result, the ultraviolet-curable resin ink on the surface side hardens due to the polymerization reaction, and the volume of the surface layer becomes relatively larger than the volume of the substrate side. As a result, stress is generated inside the first ink layer from the substrate side to the surface side, causing the first ink layer to curve toward the surface side, and consequently the sheet-like substrate to deform upwards. The magnitude of the upward deformation of the sheet-like substrate corresponds to the flexibility of the substrate.

[0012] In the second step following the first step, a second ink layer is formed on the surface of the first ink layer by inkjet printing using a second ultraviolet-curing resin ink, and then the surface of the second ink layer is irradiated with ultraviolet light. At this time, similar to the first ink layer, the surface side of the second ink layer is relatively larger in volume than the substrate side (first ink layer side). As a result, the second ink layer curves toward the surface, and consequently, the first ink layer and the substrate deform upward, creating island-like three-dimensional printed areas in the region of the substrate surface where the first and second ink layers are formed. In other words, the three-dimensional printed areas are formed not only by the first and second ink layers, but also by the upward deformation of these first and second ink layers and the substrate. In particular, if the sheet-like substrate is a flexible substrate such as a vinyl chloride sheet or a synthetic leather sheet, as the first and second ink layers curve toward the surface, the entire region of the substrate where the first and second ink layers are formed undergoes upward deformation. As a result, the outline of the three-dimensional printed area formed on the surface of the substrate becomes relatively clear.

[0013] The ink layers constituting the three-dimensional printed section are not limited to two layers, the first and second ink layers, but may also consist of one or more ink layers (hereinafter referred to as the third ink layer) laminated on top of the second ink layer. The process of forming the third ink layer (hereinafter referred to as the third process) is the same as the first and second processes described above, in which, after forming the third ink layer, ultraviolet light is irradiated from the surface side to harden at least the surface side of the third ink layer. When there are multiple third ink layers, the third process is carried out as follows: Of the multiple third ink layers, two layers that overlap vertically are formed by forming the lower third ink layer, irradiating it with ultraviolet light from the surface side to harden at least the surface side of the lower third ink layer, then forming the upper third ink layer on top of it, and irradiating it with ultraviolet light from the surface side to harden at least the surface side of the upper third ink layer.

[0014] In steps 1 to 3, the intensity of ultraviolet light irradiated onto each ink layer is preferably 100% to 50% of the intensity required for curing the ultraviolet-curable resin ink constituting each ink layer. In this case, the intensity of ultraviolet light irradiated onto each ink layer may be the same or different. If the intensity of ultraviolet light is different, it is preferable to make the intensity of ultraviolet light irradiated onto the upper ink layer less than the intensity of ultraviolet light irradiated onto the lower ink layer, taking into consideration that the ultraviolet light irradiated onto the upper ink layer passes through the upper ink layer into the lower ink layer.

[0015] Furthermore, the area on the substrate surface where the three-dimensional printed portion is formed may be colored in a different way than other areas. In this case, if the surface of the substrate is colored by inkjet printing using an ultraviolet resin ink containing a coloring agent, the entire process from forming the three-dimensional printed portion to coloring can be carried out by inkjet printing.

[0016] Furthermore, the three-dimensional patterned printed material according to the present invention 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, which has the same planar shape as the first ink layer but a smaller area than the first ink layer. [Effects of the Invention]

[0017] According to the present invention, the portion of the flexible sheet-like substrate on which the three-dimensional printed portion is formed undergoes upward deformation, thereby enabling the formation of a convex three-dimensional printed pattern on the surface of the sheet-like substrate. [Brief explanation of the drawing]

[0018] [Figure 1] Figure (a) shows a schematic configuration of a three-dimensional patterned printed material according to an embodiment of the present invention, and Figure (b) shows a schematic configuration of a comparative example. [Figure 2]Explanatory drawing of the first step of the method for manufacturing a three-dimensional pattern printed matter according to an embodiment of the present invention. [Figure 3] Explanatory drawing of the second step of the method for manufacturing a three-dimensional pattern printed matter according to an embodiment of the present invention. [Figure 4] Schematic diagram of test specimens e to i used in Test 2. [Figure 5] Schematic diagram of laminates L-1, J-1, K-1, and N-1 used in Test 2. [Figure 6] Photograph showing a manufacturing example of a three-dimensional pattern printed matter.

Embodiments for Carrying Out the Invention

[0019] Embodiments 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 the present embodiment. As shown in this figure, the three-dimensional pattern printed matter 1 includes a flexible sheet-like base material 2 and an island-shaped three-dimensional printing portion 3 including a plurality of ink layers 30 formed on the surface 21 of the base material 2. FIG. 1(a) shows an example in which one three-dimensional printing portion 3 is formed on the surface of the base material 2. However, Multiple a plurality of ink layers 30 may be formed on the surface of the base material 2. Each of the ink layers 30 constituting the three-dimensional printing portion 3 is formed by printing with an inkjet printer using a predetermined ultraviolet curable resin ink.

[0020] As will be explained in more detail later, in the three-dimensional pattern printed material 1, the three-dimensional printed portion 3 is formed on the surface 21 of the substrate 2, causing the area of ​​the substrate 2 on which the three-dimensional printed portion 3 is formed to be raised and deformed together with the three-dimensional printed portion 3. Therefore, the height of the top of the part of the substrate 2 on which 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 example printed material 1A, where only multiple ink layers 30 are formed on the surface 21 of the substrate 2 (i.e., no raised deformation occurs), as shown in Figure 1(b), the height of the three-dimensional printed portion 3A is the same as the thickness h1 of the multiple ink layers 30. Compared to this, the height of the three-dimensional printed portion 30 in the three-dimensional pattern printed material 1 of this embodiment is larger by the amount of the raised height. Furthermore, while the upper surface of the three-dimensional printed portion 3A is a flat surface in printed material 1A, the upper surface of the three-dimensional printed portion 3 is a curved surface in three-dimensional pattern printed material 1, allowing for the formation of a more varied three-dimensional pattern compared to printed material 1A.

[0021] Next, the method for manufacturing a three-dimensional patterned printed material according to this embodiment will be described with reference to Figures 2 and 3. In the method for manufacturing a three-dimensional patterned printed material according to this embodiment, a plurality of ink layers 30 (hereinafter referred to as the first ink layer 31, the second ink layer 32, etc., in order from the bottom layer) are sequentially formed 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, a first ink layer 31 is formed by inkjet printing on the surface 21 of the substrate 2 using a first ultraviolet-curable resin ink (Figure 2(a)). Then, ultraviolet light is irradiated onto the surface of the first ink layer 31. At this time, since 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, 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. In addition, 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, moving from the substrate side to the surface side. As a result, the first ink layer 31 curves toward the surface, and the substrate 2 to which the lower surface of the first ink layer 31 is fixed deforms upward following the first ink layer 31, causing the height h4 of the three-dimensional printed area to become greater than the thickness h3 of the first ink layer 31 (Figure 2(b)).

[0023] Next, a second ink layer 32 is formed on the curved surface of the first ink layer 31 by inkjet printing using a second ultraviolet-curable resin ink (Figure 3(a)). After that, ultraviolet light is irradiated onto the surface of the second ink layer 32. At this time, similar to the first ink layer 31, the polymerization reaction of the ultraviolet-curable resin ink proceeds relatively faster on the surface side of the second ink layer 32 than on the substrate 2 side (first ink layer 31 side), and as a result, the volume of the second ink layer 32 becomes relatively larger on the surface side than on the substrate 2 side. This causes the second ink layer 32 to curve towards the surface, and in response, the first ink layer 31 and the substrate 2 deform upward, and the height h6 of the three-dimensional printed area becomes larger than the height h5 before the uplift (Figure 3(b)).

[0024] In this case, 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. Therefore, theoretically, the amount of uplift caused by the second ink layer 32 is smaller than the amount of uplift caused by the first ink layer 31.

[0025] Next, several tests were conducted to verify the phenomena that occur when a three-dimensional printed area is formed on a flexible sheet-like substrate. <Test 1> In Test 1, the relationship between the amount of ultraviolet light irradiated onto an ink layer formed on a flexible sheet-like substrate and the degree of curing was investigated. Specifically, one 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 ultraviolet-curing resin ink, and each was irradiated with different amounts of ultraviolet light.

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

[0027] The ultraviolet light irradiated onto the ink layer was set to four levels: 100% (test sample a), 75% (test sample b), 50% (test sample c), and 25% (test sample d), based on the irradiation intensity recommended by the manufacturer of the UV-curable resin ink (100% irradiation intensity = standard value of the equipment setting). The irradiation time was 10 minutes. Changes in the shape of the substrate were observed immediately after irradiation with ultraviolet light (at the completion of printing), 48 hours after the start of ultraviolet irradiation, and 72 hours after the start of ultraviolet irradiation. Note that 48 hours after the start of ultraviolet irradiation corresponds to the time when the polymerization reaction of the polymerization components contained in the UV-curable resin ink is almost complete.

[0028] The results of the above experiment showed that there was no visual difference between test specimen a and test specimen b after printing was complete, and in both cases the ink layer hardened to form a cured coating. Comparing the tactile feel of the cured coatings of test specimen a and test specimen b, test specimen b had a slightly stickier surface than test specimen a. Also, test specimen b had a stronger odor than test specimen a. Since the odor disappeared as the hardening progressed, it was determined that the hardening reaction of test specimen b was insufficient. Observation 48 hours after the start of UV irradiation showed that although the stickiness of test specimen b had disappeared, the odor of test specimen b did not decrease compared to test specimen a at either the 48-hour or 78-hour mark.

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

[0030] On the other hand, both test specimens c and d were found to be in an uncured state at the time of printing completion, based on their surface condition and odor. In test specimen c, numerous bubbles formed on the surface of the ink layer within approximately 5 minutes of printing completion. These bubbles expanded over time, and after approximately 12 hours, the bubbles merged together and burst. Furthermore, after approximately 24 hours, the spongy component spontaneously peeled off from the ink layer. In test specimen d, the formation of bubbles similar to those in test specimen c was observed, but most of the ink layer had not hardened, and no significant changes in appearance were observed at either the time approximately 1 hour or 72 hours after printing completion.

[0031] From the above results, it was found that the mechanical effect applied to the substrate by the cured coating is the difference in volume change between the surface and substrate sides as the ink layer hardens, specifically the stress resulting from the relative expansion of the surface ink layer's volume relative to the substrate ink layer's volume, and that the rate of this volume change varies depending on the amount of ultraviolet light irradiated onto the ink layer.

[0032] <Exam 2> Next, Test 2 was conducted to verify the change in the elevation of the substrate depending on the number of layers in a laminate of multiple ink layers when the three-dimensional printed section consists of a laminate of multiple ink layers. The same substrate (synthetic leather sheet) used in Test 1 was used. In Test 2, ink layers with a thickness of 30-40 μm were formed on the surface of a substrate using UV-curing resin ink via inkjet printing. Each ink layer was then irradiated with 100% UV light for 10 minutes to form a cured coating. Each ink layer (cured coating) is referred to as test specimens e-i. Test specimen e: A perfect circle with a diameter of 10 mm. Test specimen f: A perfect circle with a diameter of 12 mm. Test specimen g: A perfect circle with a diameter of 14 mm. Test specimen h: A perfect circle with a diameter of 16 mm. Test specimen i: A perfect circle with a diameter of 18 mm.

[0033] As shown in Figure 4, each test specimen e to i was formed by arranging them on the surface of a single substrate 2, and the appearance was observed when the number of ink layers was set to 1, 3, and 6, respectively. The following results were obtained. Layer count 1: No bulging due to deformation of the substrate was observed in any of the test specimens; only an increase in thickness due to the volume of the cured coating was observed. Layer count 3: Bulging due to substrate deformation was observed in all test specimens. The height of the bulge due to substrate deformation, excluding the thickness of the cured coating film (corresponding to the length of h1 + h2 in Figure 1), was approximately 0.3 mm in all test specimens, and no difference in bulge height was observed between test specimens. Layer count 6: In all test specimens, bulging due to deformation of the substrate was observed, and the height of the bulging increased in proportion to the increase in area. The height of the bulging for each test specimen is 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 test specimens e to i in order of decreasing area. Laminates L-1, J-1, K-1, and N-1 were formed by repeatedly creating an ink layer using UV-curing resin ink via inkjet printing and then curing it.

[0035] As shown in the upper part of Figure 5(a), the laminate L-1 has a structure in which five types of laminates are stacked on the base material 2 in the order of test specimens i, h, g, f, and e, with their centers aligned. In the base material 2 on which such laminate L-1 was formed, the region where laminate L-1 was formed was raised, 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 the base material 2 on which laminate L-1 was formed. As can be seen from this figure, the base material L-2 in the laminate formation region was deformed in an embossed manner, drawing gentle steps at roughly the same rate starting from the boundary lines of each ink layer.

[0036] Furthermore, although not shown in the diagram, when the shape of each layer of the laminate was changed from a circle to a square, equilateral triangle, ellipse, or rhombus, it exhibited an embossed deformation that formed a rounded, stepped pattern, similar to that of base material L-2, provided that the lamination ratio and number of layers were maintained. This revealed that, regardless of the shape of the cured coating (ink layer), a laminate in which multiple cured coatings are stacked in a way that gradually reduces their area causes the substrate to bulge.

[0037] Furthermore, the following two types of laminates were fabricated, and the changes in their shape were compared. A total of nine layers of laminate, consisting of three layers each of test specimens g+h+i (hereinafter: Laminate J-1, see upper part of Figure 5(b)). A total of nine layers of laminate, consisting of three layers each of test specimens e+f+i (hereinafter: Laminate K-1, see upper part of Figure 5(c)). In each laminate, the centers of the test specimens were aligned, and the specimens were stacked in order from the largest to the smallest area. As a result, a conical ridge with a height of approximately 1.5 mm was observed in the region where laminate J-1 was formed on the substrate, and a conical ridge with a height of approximately 1.2 mm was observed in the region where laminate K-1 was formed.

[0038] Comparing the cross-sectional elevations of each laminate, all of them were staircase-like, starting near the boundary between a certain layer and the layer immediately above it. Laminate J-1 traced a gentle arc in accordance with the uniform area change from test specimen i → test specimen h → test specimen g from the bottom, while laminate K-1 formed a convex, non-uniform elevation with a significant change in angle near the boundary between test specimen i and test specimen f (see J-2 and K-2 in the lower part of Figures 5(b) and (c)).

[0039] From these results, it was found that even within a single raised structure, the slope changes near the boundary line of the stacked ink layers (cured coating). From this, it was inferred that the cross-sectional shape and external shape of the three-dimensional printed area can be controlled by adjusting the positional relationship of the stacked ink layers. For example, Figure 5(d) shows an example in which a three-dimensional printed section (laminated body) is formed on a substrate by stacking multiple circular ink layers with their centers offset. In this example, raised bodies with irregular cross-sections other than cones are obtained (see N-1 and N-2 in Figure 5(d)).

[0040] <Manufacturing example> Figure 6 shows an example of a three-dimensional patterned printed material made by inkjet printing on a synthetic leather sheet using UV-curing resin ink to form a three-dimensional printed area, and then coloring the surface. This synthetic leather sheet is the same as the one used in Test 1. Figure 6(b) is a magnified photograph of a part of Figure 6(a), and Figure 6(c) is a photograph of the back surface of the substrate. From Figure 6(c), it can be seen that the substrate has deformed into 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 three-dimensional printed area by inkjet printing using ultraviolet-curing resin ink, which is then cured to form a coating film before being colored. The cured coating film, consisting of the ink layer, is formed on the surface of the three-dimensional printed area as protrusions or raised patterns, thereby decorating the surface of the three-dimensional printed area and enabling the production of three-dimensional patterned printed materials with even greater design and decorative appeal. [Explanation of Symbols]

[0042] 1… Printed material with three-dimensional pattern 2...Base material 21…Surface 3…3D printing department 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.

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