Printed material and printing method

Abstract

To provide a printed material and a printing method that achieve vivid and clear images.SOLUTION: A printed product 300 includes a transparent substrate 302, a print layer 304 formed on the substrate 302, and a white backing layer 306 covering the print layer 304. The print layer 304 comprises red dots containing red color-developing substances that emit light mainly in red, green dots containing green color-developing substances that emit light mainly in green, blue dots containing blue color-developing substances that emit light mainly in blue, and white dots containing a white fluorescent agent.SELECTED DRAWING: Figure 11

Description

[Technical field]

[0001] The present invention relates to printing technology, and more particularly to printed matter and printing methods utilizing transparent or translucent substrates. [Background technology]

[0002] Silkscreen printing is a type of screen printing technique. A fine mesh is made from silk, and for each ink color, holes are made that allow the ink to pass through and holes that do not, and a plate is made for that color. Several plates are needed for each color. Once all the plates are complete, one plate is placed on the paper, resin, cloth, or other substrate that is to be printed, and the ink that corresponds to that plate is placed on the plate and spread with a spatula to print that color. Once the ink has dried, the next plate is placed and the next color is printed. By repeating this process, the print is gradually completed. Historically, the plates were originally made from silk, and so it is still customarily called silkscreen printing, but nowadays the plates are often made from thin metal wire.

[0003] Patent Document 1 proposes stencil printing using additive color mixing, which uses glossy R, G, and B inks and differs from that of ordinary printers. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 5725581 Summary of the Invention [Problem to be solved by the invention]

[0005] The inventor has been working in silk screen dyeing for about 50 years. During that time, he has used many dyes and pigments, and while searching for patent documents in search of inks with better color development, he came across the method of Patent Document 1. He actually made R, G, and B inks experimentally and mixed them, and noticed that the white turned out to be a dull color close to cream. The inventor often dyes colorful patterns on a black background, and in that case, pure white, which stands out most against the black, is very important. He would like to develop printed matter that achieves even more beautiful color development while taking advantage of the glossiness based on the idea of ​​Patent Document 1. [Means for solving the problem]

[0006] The printed matter of the present invention comprises a transparent or translucent substrate, a printing layer formed on the substrate, and a backing layer covering the printing layer, and the printing layer comprises red dots containing a red color-producing substance that mainly emits red color, green dots containing a green color-producing substance that mainly emits green color, blue dots containing a blue color-producing substance that mainly emits blue color, and white dots containing a white fluorescent agent.

[0007] The printing method of the present invention includes a first step of forming a printing layer on a transparent or translucent substrate by a stencil printing technique, and a second step of backing the printing layer to cover it.The first step forms the printing layer using multiple types of dots, each containing a different colored color-developing substance, and white dots containing a white fluorescent agent. Effect of the Invention

[0008] According to the present invention, it is possible to provide printed matter with clear patterns. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1(a) is a schematic plan view outlining the arrangement of halftone dots in a printed matter relating to the base technology, and FIG. 1(b) is a cross-sectional view taken from the IB-IB direction of FIG. 1(a). [Diagram 2]Figure 2(b) is a schematic plan view outlining the internal structure of a first color dot that constitutes a halftone dot in a printed matter relating to the base technology, and Figure 2(a) is a cross-sectional view viewed from the IIA-IIA direction in Figure 2(b). [Diagram 3] FIG. 1 is a schematic cross-sectional view illustrating an outline of the internal structure of pigment chips (pearl pigments) of each color used in printed matter according to the base technology, and explaining the principle by which interference light is generated by the pigment chips. [Figure 4] 1 is a schematic cross-sectional view illustrating the position of the viewpoint when a printed matter according to the base technology uses an opaque black film as a base film. FIG. [Diagram 5] FIG. 1 is a schematic cross-sectional view illustrating the relationship between the viewpoint and a non-transparent black ink layer when a printed matter according to the base technology uses a film that is transparent to visible light wavelengths as a base film. [Figure 6] This is a schematic bird's-eye view (perspective view) explaining the relationship between an RGB printed body in which a first color pattern layer, a second color pattern layer, and a third color pattern layer are printed on a base film, and a non-transparent black ink layer coated on top of this RGB printed body. [Figure 7] Figure 7(a) is a schematic plan view outlining the arrangement of halftone dots when silver dots are further added to the halftone dots of a printed matter relating to the base technology, and Figure 7(b) is a cross-sectional view seen from the VIIB-VIIB direction of Figure 7(a). [Figure 8] FIG. 1 is a schematic diagram illustrating the order of printing of each pigment ink in a method for producing a printed matter according to a prerequisite technology. [Figure 9] FIG. 1 is a layer diagram illustrating an outline of a method for producing a printed matter according to a prerequisite technology, using schematic cross-sectional views. [Figure 10] 10A to 10C are schematic cross-sectional views for explaining an outline of the structure of a printed matter according to the base technology, corresponding to the manufacturing method of FIG. 9, together with the positional relationship of the viewpoints. [Figure 11] 1 is a schematic cross-sectional view of a printed matter according to an embodiment. [Figure 12] 12(a) and 12(b) are diagrams for explaining the configuration of the printing layer in FIG. [Figure 13]13(a) and 13(b) are diagrams for explaining the configuration of a printed layer of a printed matter according to a modified example of the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] [Prerequisite technology] Japanese Patent No. 5725581 describes a full-color printing technology that uses additive mixing of the three primary colors of light: red (R), green (G), and blue (B). This invention is based on this technology, and is therefore incorporated herein by reference.

[0011] [Background of prerequisite technology] A printed display change device has been proposed which comprises a laminated printed section consisting of a first printed section screen-printed with light-transmitting paint, a smoke printed section, and a second printed section printed with non-transmitting paint, and a lighting means, in which the design of the printed surface painted with light-transmitting paint and the design of the printed surface painted with normal paint are hidden from the surface by the lighting means and the smoke printing, or made to appear on the surface by illuminating them (see JP 2012-192001 A).

[0012] The first and second printed sections in the invention described in JP 2012-192001 A use conventional process printing technology that attempts to reproduce all colors using the four "process colors" of cyan (C), magenta (M), yellow (Y) and black (K), known as the four process primary colors. In conventional process printing technology, when equal amounts of cyan, magenta, and yellow are layered, the brightness decreases and, in theory, eventually becomes black, so conventional process printing technology is based on subtractive color mixing. Since the human eye distinguishes colors using three types of photoreceptor cells, full color can be generated by subtractively mixing the three process colors cyan, magenta, and yellow, and mixing all three colors should produce black.

[0013] However, when mixing actual inks, mainly due to technical characteristics, it is not possible to reproduce true black, and only a slightly greenish black or a muddy brown can be produced, so in order to express true black, black ink is added and printed in four colors, "CMYK." The printing technology of the invention described in JP 2012-192001 A, which is used in the inventions described in JP 2012-192001 A, attempts to express all colors by arranging a large number of these four primary colors (CMYK) inks as fine dots called halftone dots, and using subtractive color mixing between the inks expressed as dots and additive color mixing by the human eye that sees them.

[0014] The reason why the method of coloring RGB on white paper was not used in conventional color printing technology is that in additive color mixing, the appearance of "white" like paper is the same as when all RGB colors are layered (reflected). In other words, in RGB additive color mixing, if no colors are layered, the result is "black," but white paper is "white" even without applying any ink, so additive color mixing is inappropriate for printing on white paper.

[0015] "Subtractive color mixing" means subtracting colors. If no ink is applied, and no coloring is done, the result is "white," and as CMY is layered, the result becomes gradually darker and eventually black. "Subtractive color mixing" uses the exact opposite process in printing to "additive color mixing" of the three primary colors of light, red (R), green (G), and blue (B). Whereas "black" is an additive color mixture when no colors are layered, "black" is a subtractive color mixture when all colors are layered, which is why traditional color printing, which is based on white paper, used "subtractive color mixing" of CMY.

[0016] Although theoretically almost all colors can be reproduced by combining cyan, magenta, yellow, and black process inks, in reality, various technical constraints limit the reproduction of full colors. In particular, due to the characteristics of process inks, vivid colors such as orange, purple, and green are impossible or difficult to reproduce. Furthermore, in CMYK four-color printing, red (R), green (G), and blue (B) are made by combining cyan, magenta, and yellow, so the areas where the halftone dots overlap dot-on-dot become very unstable. If the ink balance is lost in the areas where the halftone dots overlap, there are problems such as changes in gray or changes in the hue and saturation of the red, green, and blue.

[0017] [Issues that the underlying technology aims to solve] The underlying technology aims to provide a printed matter and printing method with more vivid colors than conventional printing using four-color CMYK process inks.

[0018] [Means for solving the problem using the underlying technology] In order to achieve the above object, a first aspect of the base technology is a printed matter including (a) a base film, (b) a first color pattern layer formed on the base film and composed of a plurality of first color dots, (c) a second color pattern layer formed on the first color pattern layer and composed of a plurality of second color dots, and (d) a third color pattern layer formed on the second color pattern layer and composed of a plurality of third color dots. In this specification, "dot" means a point that is an element that constitutes a printed image, and its shape is not limited to a circle, but may be a rectangle, a polygon, or other shape.

[0019] In the printed matter according to the first aspect, each of the first color dots includes a first color binder and a plurality of first color pigment chips dispersed within the first color binder. Similarly, each of the second color dots includes a second color binder and a plurality of second color pigment chips dispersed within the second color binder, and each of the third color dots includes a third color binder and a plurality of third color pigment chips dispersed within the third color binder. Each of the first color pigment chips, second color pigment chips, and third color pigment chips is any one of a red interference pigment, a green interference pigment, and a blue interference pigment.

[0020] A second aspect of the base technology is summarized as a printing method including the steps of: (a) printing a first color pattern layer composed of a plurality of first color dots on a base film using screen printing; (b) printing a second color pattern layer composed of a plurality of second color dots on the first color pattern layer using screen printing; and (c) printing a third color pattern layer composed of a plurality of third color dots on the second color pattern layer using screen printing.

[0021] In the printing method according to the second aspect, the ink for printing the first color pattern layer includes a first color binder and a plurality of first color pigment chips dispersed in the first color binder. Similarly, the ink for printing the second color pattern layer includes a second color binder and a plurality of second color pigment chips dispersed in the second color binder, and the ink for printing the third color pattern layer includes a third color binder and a plurality of third color pigment chips dispersed in the third color binder. Similarly to the printed matter according to the first aspect, each of the first color pigment chips, the second color pigment chips, and the third color pigment chips is any one of a red interference pigment, a green interference pigment, and a blue interference pigment.

[0022] [Embodiment of the Premise Technology] Next, the prerequisite technology will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic, and the relationship between thickness and planar dimensions, the ratio of thickness of each layer, etc., differ from the actual ones. Therefore, the specific thickness and dimensions should be determined with reference to the following description. In particular, in the following description, the "first color dot", "second color dot", "third color dot", etc. are circular, but the shape of the "dot" that is an element of the printed image may be various shapes other than circular, such as rectangular and polygonal. In addition, it goes without saying that the drawings include parts with different dimensional relationships and ratios.

[0023] The printed matter according to the prerequisite technology has a plurality of first color dots 23 provided on a base film 11 as shown in FIG.i-2 ,twenty three i-1 ,twenty three i ,twenty three i+1 ,twenty three i+2 ,twenty three i+3 and a plurality of second color dots 22 provided on the first color pattern layer. i-1 ,twenty two i ,twenty two i+1 and a plurality of third color dots 21 provided on the second color pattern layer. i-1 ,twenty one i and a third color pattern layer composed of the first color dots 23. i-2 ,twenty three i-1 ,twenty three i ,twenty three i+1 ,twenty three i+2 ,twenty three i+3 , 2nd color dot 22 i-1 ,twenty two i ,twenty two i+1 and third color dot 21 i-1 ,twenty one i Each of these dots will be the "halftone dots" of screen printing. The size of the halftone dots has a diameter that depends on the mesh size (screen ruling) of the printing screen, and is one of the measures of the accuracy of screen printing. For example, the size of the halftone dots is selected to be about 3 to 5 times the mesh size (screen ruling).

[0024] As shown in FIG. i-2 ,twenty three i-1 ,twenty three i ,twenty three i+1 ,twenty three i+2 ,twenty three i+3 Each of the first color pigment chips 231a, 231b, 231c, and 231d includes a first color binder 232 and a plurality of first color pigment chips 231a, 231b, 231c, and 231d dispersed inside the first color binder 232. Each of the first color pigment chips 231a, 231b, 231c, and 231d shown in FIG. 2 is a flake 231 that is transparent to light with a wavelength in the visible light region, as shown in FIG. SUB And this slice 231 SUB Metal oxide film 231 covering OX The slice 231 SUBThe materials that can be used include chips of natural mica, synthetic mica, silica, alumina, glass, polysilicate, etc. As for polysilicate, flaky inorganic powders made of layered polysilicate include makatiite (Na2Si4O9·5H2O), ileite (Na2Si8O 17 10H2O), Magadiite (Na2Si 14 O 29 10H2O), Kenyaite (Na2Si 20 O 41 Flakes of layered polysilicates such as SiO2 (10H2O) can be used.

[0025] Metal Oxide Film 231 OX As for thin slices 231 SUB Titanium oxide (TiO2), zirconium oxide (ZrO2), zinc oxide (ZnO), iron oxide (Fe2O3), tin oxide (SnO2), etc., which have a higher refractive index n (for example, the refractive index n of mica is about 1.58), can be used. In particular, titanium oxide with a refractive index n = 2.3 to 2.7 and iron oxide with a refractive index n = 3.01 are suitable for forming the flakes 231. SUB It is preferable to coat the film with a predetermined optical thickness t opt = (geometric thickness of metal oxide t geo ) × (refractive index of metal oxide n) metal oxide film 231 OX Thin slices 231 SUB By coating the optical film with a thickness of t opt At 100 nm, the interference light is silver, at 210 nm, the interference light is gold, at 250 nm, the interference light is red, at 310 nm, the interference light is blue, and at 360 nm, the interference light is green. In the case of titanium oxide, taking into account the variation in the refractive index n, the geometric film thickness t geo =t1=t2=80~100nm, red interference light, geometric film thickness t geo =100~140nm, blue interference light, geometric film thickness t geo = 120 to 160 nm, green interference light is observed. geo By controlling t1 and t2, it is possible to realize a pigment chip exhibiting red interference color, green interference color, and blue interference color.OX When used as a titanium oxide, the refractive index n may be 2.3 or less depending on the particle size of the titanium oxide.

[0026] The binder 232 for the first color may be selected according to the material of the base film 11, and for example, a transparent ink binder for vinyl screen printing may be used. i-1 ,twenty two i ,twenty two i+1 Each of the third color dots 21 includes a second color binder and a plurality of second color pigment chips dispersed in the second color binder. i-1 ,twenty one i Each of the third color binders includes a third color binder and a plurality of third color pigment chips dispersed within the third color binder.

[0027] The first color pigment chips 231a, 231b, 231c, 231d, the second color pigment chips, and the third color pigment chips of the printed matter according to the base technology are either a red interference pigment (red pearl pigment), a green interference pigment (green pearl pigment), or a blue interference pigment (blue pearl pigment), and the geometric thickness t of the metal oxide film constituting the pigment chips is geo In the printed matter related to the base technology, for convenience, the first color pigment chip is described as being a blue interference pigment, the second color pigment chip is a green interference pigment, and the third color pigment chip is a red interference pigment, but the first color pigment chip may be a green interference pigment, the second color pigment chip is a red interference pigment, and the third color pigment chip is a blue interference pigment, or other combinations such as the first color pigment chip being a red interference pigment, the second color pigment chip being a blue interference pigment, and the third color pigment chip being a green interference pigment are also acceptable.

[0028] That is, in the order in which the first color pigment chip, the second color pigment chip, and the third color pigment chip are laminated from the base film 11 side, when only one color can be selected from the red interference pigment, the green interference pigment, and the blue interference pigment, the number of arrangements (permutations) is as follows: 3P3=3!=6 However, the red (R), green (G), and blue (B) colors may be selected in any order.

[0029] The three primary colors, red (R), green (G), and blue (B), are reflected colors. Each of the first, second, and third color pigment chips produces one of the three different primary colors of light as interference light on the reflected light side, making it possible to additively mix (combine) the first, second, and third color pattern layers of the three primary colors, thereby displaying a color image of any color.

[0030] As shown in FIG. 1(b), the third color dot 21 i-1 is the first color dot 23 i-2 Since the second color dot 22 overlaps a part of the first color dot 22, additive color mixing occurs at the dot-on-dot portion. i-1 is the first color dot 23 i-1 On some of the dots, there are dots on the third color dots. i is the first color dot 23 i and second color dot 22 i Each part of the dots is dot-on-dot, and the second color dots are 22 i+1 is the first color dot 23 i+2 Since the dots overlap on a portion of the image as dot-on-dot, additive color mixing occurs in the overlapping dot-on-dot regions. In addition, although reference numerals have been omitted to avoid complicating the drawing, there are many areas on the plane pattern where additive color mixing occurs as dot-on-dot, as shown in the plan view of Figure 1(a). Furthermore, interference light from nearby halftone dots that the human eye cannot resolve also causes additive color mixing in the human eye, even if they are not dot-on-dot.

[0031] By additively mixing the interfering light of red (R), green (G), and blue (B), the human eye can obtain a sense of brightness as if the print consisting of the first color pattern layer, the second color pattern layer, and the third color pattern layer is emitting light, and the human eye can observe a full-color image with more vivid color development than conventional four-color CMYK printing. As shown in Fig. 4, when an opaque black film is used as the base film 12, the first color pattern layer, the second color pattern layer, and the third color pattern layer are directly viewed from the viewpoint (the upper side of the base film 12 in Fig. 4), and the interference light reflected from the internal flakes of the first color pigment chip, the second color pigment chip, and the third color pigment chip is additively mixed, and a full-color image can be observed by observing this additively mixed image from the viewpoint. In the additive color mixture of red, green, and blue, the areas where none of the first color pattern layer, second color pattern layer, and third color pattern layer exist become "black" with no overlap of light, so a black base film 12 is used.

[0032] On the other hand, as shown in FIG. 5, when a film transparent to wavelengths of visible light such as red, green, and blue is used as the base film 13, the viewpoint can be set on the side where the first color pattern layer, the second color pattern layer, and the third color pattern layer are viewed through the base film 13 (below the base film 13 in FIG. 5). In the case of FIG. 5, light from the viewpoint side passes through the base film 13, and the interference light of the light reflected by the internal flakes of the first color pigment chip, the second color pigment chip, and the third color pigment chip is additively mixed. This additively mixed light passes through the base film 13 again and reaches the viewpoint, allowing a full-color color image to be observed. In additive color mixing, if none of the first color pattern layer, the second color pattern layer, and the third color pattern layer exists and there is no overlap of light, the color becomes "black," so a non-transparent black ink layer 24 is further provided on the third color pattern layer in FIG. 5.

[0033] The structure shown in FIG. 5 is an RGB printed body 13 in which a first color pattern layer, a second color pattern layer, and a third color pattern layer are printed on a base film 13. print Prepare this RGB print body 13 print 6. On top of this, a non-transparent black ink layer 24 may be coated as shown in FIG. In additive color mixing, white should be produced by mixing equal amounts of red (R), green (G), and blue (B). However, in the additive color mixing caused by the interference light of the light reflected by the first color pigment chip, the second color pigment chip, and the third color pigment chip, the white is weak, so as shown in Figure 7, multiple silver dots 25 are placed on the third color pattern layer. i-1 ,twenty five i Although not shown in the figure, it is preferable to further include a white pattern layer composed of silver dots 25 as shown in FIG. i-1 ,twenty five i Each of the silver dots contains a silver binder and a number of silver pigment chips dispersed within the silver binder. Since there are currently no white pigment chips, the silver pigment chips are used to create the silver dot 25 i-1 ,twenty five i Each of these is used as a white dot.

[0034] The printed matter relating to the base technology differs from the color produced by conventional printing using four-color CMYK process inks in that the unprecedented effect of RGB printing allows for vivid color expression that makes it seem as if you are viewing an image on a plasma display or organic electroluminescence display, providing highly aesthetically pleasing printed matter and a printing method.

[0035] A method for producing a printed matter according to the base technology will be described with reference to Figures 8 to 10. Note that the method for producing a printed matter described below is one example, and it goes without saying that the method can be realized by various other production methods, including variations thereof.

[0036] (a) First, as shown in FIG. 8, the first color (blue) pearl pigment ink 23 INK By using a screen printing technique using the above method, a plurality of first color (blue) dots 23 are printed on a transparent base film 13 shown in FIG. k-2 ,twenty three k-1 ,twenty three k ,twenty three k+1A first color (blue) pattern layer including the above is formed with an ink thickness of 4 to 5 μm. Since FIG. 9 is an example of a cross-sectional view of a specific cross section, in reality, the first color dots 23 shown in FIG. 9 are formed in the same manner as in FIG. 1. k-2 ,twenty three k-1 ,twenty three k ,twenty three k+1 A large number of dots of the first color other than the first color exist on the plane pattern as halftone dots, forming the plane topology of the first color pattern layer.

[0037] (b) Next, as shown in FIG. 8, the second color (green) pearl pigment ink 22 INK The first color pattern layer (23) shown in FIG. 9 was formed by screen printing technology using k-2 ,twenty three k-1 ,twenty three k ,twenty three k+1 ) on top of which are multiple second color (green) dots 22 k-2 ,twenty two k-1 ,twenty two k ,twenty two k+1 A second color (green) pattern layer including the first color dots 23 is formed with an ink thickness of 4 to 5 μm. k-2 ,twenty three k-1 ,twenty three k ,twenty three k+1 In the areas where there are no dots of the second color, the dots 22 k ,twenty two k+1 etc. are formed directly on the base film 13. As described above, since FIG. 9 is a cross-sectional view of a specific cross section, the second color dots 22 shown in FIG. k-2 ,twenty two k-1 ,twenty two k ,twenty two k+1 A large number of second color dots other than the first color dots exist on the plane pattern as halftone dots, forming the plane topology of the second color pattern layer.

[0038] (c) Next, the third color (red) pearl pigment ink 21 INK The second color pattern layer (22 k-2 ,twenty two k-1 ,twenty two k ,twenty two k+1) on top of which are multiple third color (red) dots 21 k-3 ,twenty one k-2 ,twenty one k-1 ,twenty one k A third color (red) pattern layer including the second color dots 22 is formed with an ink thickness of 4 to 5 μm. k-2 ,twenty two k-1 ,twenty two k ,twenty two k+1 In the places where there is no third color dot 21 k-1 etc. is the first color dot 23 k-2 The first color dot 23 is formed on the first color dot 23. k-2 ,twenty three k-1 ,twenty three k ,twenty three k+1 and second color dot 22 k-2 ,twenty two k-1 ,twenty two k ,twenty two k+1 In the area where neither of the above exists, the third color dot 21 k-3 etc. are formed directly on the base film 13. Note that the third color dot 21 shown in FIG. k-3 ,twenty one k-2 ,twenty one k-1 ,twenty one k Of course, many other third color dots exist as halftone dots on the plane pattern, forming the plane topology of the third color pattern layer.

[0039] (d) Next, Silver Ink 25 INK The third color pattern layer (21 k-3 ,twenty one k-2 ,twenty one k-1 ,twenty one k ) on top of the silver dot 25 k A white pattern layer containing the above is formed with an ink thickness of 4 to 5 μm (since there is no white pigment ink, a silver dot 25 is used). k In practice, as shown in FIG. 10, the first color dot 23 is used as a white dot. k-2 ,twenty three k-1 ,twenty three k ,twenty three k+1 etc., second color dot 22 k-2,twenty two k-1 ,twenty two k ,twenty two k+1 etc., and third color dot 21 k-3 ,twenty one k-2 ,twenty one k-1 ,twenty one k In areas where neither of these exist, Silver Dot 25 k etc. are formed directly on the base film 13.

[0040] (e) Next, non-transparent black ink 24 INK A white pattern layer (25 k ) is coated with a non-transparent black ink layer 24 over the entire surface with an ink thickness of 4 to 5 μm. Since it is coated over the entire surface, as shown in FIG. k-2 ,twenty three k-1 ,twenty three k ,twenty three k+1 etc., second color dot 22 k-2 ,twenty two k-1 ,twenty two k ,twenty two k+1 etc., 3rd color dot 21 k-3 ,twenty one k-2 ,twenty one k-1 ,twenty one k etc., and Silver Dot 25 k In the areas where none of the above are present, the non-transparent black ink layer 24 is formed directly on the base film 13. INK is applied, so the third color dot 21 k-3 ,twenty one k-2 ,twenty one k-1 ,twenty one k In the areas where no dots of the second color are present, the non-transparent black ink layer 24 is k-1 ,twenty two k+1 etc., and a second color dot 22 is formed on the second color dot 22. k-2 ,twenty two k-1 ,twenty two k ,twenty two k+1 In the areas where no dots of the first color are present, the non-transparent black ink layer 24 is k+1 It will be formed on top of the above.

[0041] As described above, according to the method for producing a printed matter according to the base technology, the base film 13 is transparent to wavelengths of visible light such as red, green, and blue, so that the viewpoint can be placed on the side where the first color pattern layer, the second color pattern layer, and the third color pattern layer are viewed through the base film 13 (the upper side of the base film 13 in FIG. 10) as shown in FIG. 10. In the positional relationship of the viewpoints in FIG. 10, light from the viewpoint side passes through the base film 13, and the interference light of the light reflected by the internal flakes of the first color pigment chip, the second color pigment chip, and the third color pigment chip is additively mixed. This additively mixed light passes through the base film 13 again to reach the viewpoint, so that a full-color color image with more vivid color development than conventional CMYK four-color printing can be observed.

[0042] As already mentioned, in the explanation of the underlying technology, the RGBW printing layer was described as having a first color pigment chip being a blue interference pigment, a second color pigment chip being a green interference pigment, and a third color pigment chip being a red interference pigment, but other combinations may also be used, such as a first color pigment chip being a green interference pigment, a second color pigment chip being a red interference pigment, and a third color pigment chip being a blue interference pigment.

[0043] Furthermore, in the explanation of the underlying technology, the "first color dots," "second color dots," "third color dots," etc. are given as examples of being circular. However, as already mentioned, the shape of the "dots" that are elements of the printed image related to the underlying technology may be any polygon, such as a square, rectangle, or pentagon.

[0044] [Embodiments of the present invention] The printing method according to the embodiment appropriately applies the above-mentioned base technology to realize a printed matter with a more vivid image by additively mixing four colors, RGB and adding white (W). In the base technology, since white pigment chips do not exist, silver pigment chips are used to express the white color. In contrast, in the present embodiment, white is expressed by the white light emitted by a white fluorescent agent. Furthermore, unlike the base technology, in the present embodiment, a white backing layer is provided to cover the printed layer. The white backing layer prevents the white fluorescent agent in the printed layer from evaporating over time, and the white color makes the image clearer.

[0045] FIG. 11 shows a printed matter 300 obtained by the printing method according to the embodiment. The printed matter 300 includes a substrate 302, a printed layer 304, and a white backing layer 306. The pattern (not shown) is visible from the side of the substrate 302 opposite to the side where the printed layer 304 is located, that is, by looking at the printed layer 304 from the viewpoint Vp. Therefore, the substrate 302 is transparent or semi-transparent. In either case, the substrate 302 itself may have a pattern or design in advance. The substrate 302 corresponds to the base films 11 and 13 of the base technology, but its shape is not limited to a film as long as the printed layer 304 can be seen through it. Rather, if a thick acrylic plate is used, a pattern that looks like it is sinking to the bottom of the water can be expressed.

[0046] In this printing method, first, in the first step, a printing layer 304 is formed on a substrate 302 by a silk screen technique. At this time, the printing order is reversed from the normal printing order, assuming that the printing layer 304 will be viewed in the above-mentioned viewing direction. Then, in the second step, a white backing layer 306 is applied to cover the printing layer 304.

[0047] Fig. 12(a) is a schematic plan view showing the configuration of the printed layer 304 in Fig. 11. Fig. 12(b) is a cross-sectional view taken along the line AA in Fig. 12(a). As shown in Figs. 12(a) and 12(b), the printed layer 304 includes red dots 322, green dots 324, blue dots 326, and white dots 328. These dots of each color express a pattern (not shown) in the printed layer 304 so that it can be seen from a viewpoint Vp through the substrate 302. In Fig. 12(a), in order to avoid complication of the drawing, some of the reference numerals of the red dots 322, green dots 324, blue dots 326, and white dots 328 are omitted.

[0048] The red dot 322, the green dot 324, and the blue dot 326 are the third color dots 21 of the prerequisite technology. i-1 ,twenty one i , 2nd color dot 22 i-1 ,twenty two i ,twenty two i+1 , 1st color dot 23 i-2 ,twenty three i-1 ,twenty three i ,twenty three i+1 ,twenty three i+2 ,twenty three i+3 12, the blue dots 326, the green dots 324, and the red dots 322 are stacked in this order on the substrate 302, but they may be stacked in any other order.

[0049] In the base technology, the first color dot, the second color dot, and the third color dot contain interference pigments of the respective colors, but in this embodiment, the red dot 322 contains a red coloring material, the green dot 324 contains a green coloring material, and the blue dot 326 contains a blue coloring material. The red coloring material, the green coloring material, and the blue coloring material each mainly emit their respective colors. The "color" of these coloring materials refers to the color of light reflected when light hits the coloring material. In other words, "emits mainly red" refers to the color of light emitted by the red coloring material being mainly red, so that humans can recognize the color red. For example, these coloring materials include interference pigments and pearl pigments.

[0050] The base technology is Silver Dot 25, which contains silver pigment chips.i-1 ,twenty five i In the previous embodiment, the white dots 328 were used as white dots, but in this embodiment, the white dots 328 contain a white fluorescent agent, and the white light emitted by the white fluorescent agent produces a vivid white color. As described in the explanation of the base technology, in additive color mixing, overlapping the reflected light of the three colors red, blue, and green produces white light, but the whiteness of the light is weak. In this embodiment, the white dots, which are whiter than the silver dots of the base technology, make the pattern in the printing layer 304 appear clearer. The white fluorescent agent is not particularly limited, and a known white fluorescent dye or a known white fluorescent pigment can be used.

[0051] Unlike the base technology, in this embodiment, the printed layer 304 is sealed with a white backing layer 306 as shown in Fig. 11 to prevent deterioration over time. Of course, the base material 302 itself, which is in front of the pattern, also has this effect. The idea is that the base material 302 and the white backing layer 306 provide airtight protection for the pattern. In addition, the white light emitted by the white backing layer 306 makes the pattern on the printed layer 304 look clearer, as if liquid crystal was backlit.

[0052] The white backing layer 306 contains a white pigment. Known white pigments such as titanium oxide can be used as the white pigment. It is also acceptable to back-up with inks other than white. When backing with black, the pattern was beautiful, like lacquerware floating on lacquer. However, the pattern was most vivid when using white pigments, especially those containing fluorescent components. The color to be selected can be determined based on the image of the work.

[0053] As a modified example, the printed layer 304 may further include dots of a color (hereinafter referred to as an "important color") that is desired to be prominent in the printed matter. Fig. 13(a) is a schematic plan view showing the configuration of the printed layer 304 of the modified example. In this figure, to avoid complication, some of the reference numerals of the red dots 322, green dots 324, blue dots 326, white dots 328, and important color dots 330 have been omitted. Fig. 13(b) is a cross-sectional view taken along line BB of Fig. 13(a).

[0054] 13(a) and 13(b), the important color dots 330 are placed on the surface of the printed layer 304 that contacts the base material 302, and are located below the dots of the four colors mentioned above. In other words, the important color dots 330 are placed on the top surface of the printed layer 304 when viewed from the viewpoint Vp. This configuration makes the important colors appear clearer in the picture. It is empirically known that even in the case of oil paintings, adding back important colors at the end can add definition to the picture, and this is also achieved in this modified example.

[0055] For example, if the picture shows the sea, the important color may be blue, if the picture shows a yacht floating on the sea, or pink for cherry blossoms. The area of ​​that part or the meaning that that part has in the original picture does not matter. Important colors may be specially prepared in advance by mixing RGB inks, or they may be prepared by mixing CMYK inks.

[0056] In the manufacturing method of the printed matter according to the base technology, the silver dots of the white pattern layer are formed by screen printing with silver ink, and then a non-transparent black ink is applied over the entire surface of the white pattern layer, but in the present embodiment, white dots 328 are formed by screen printing with ink containing a white fluorescent agent, and then ink containing a white pigment is applied over the entire surface of the printed layer 304 to form the white backing layer 306. In a modified example, when an important color is to be added to the printed layer 304, first important color dots 330 are formed on the substrate 302 by screen printing with the important color ink, and then red, green, and blue dots are formed by screen printing with the respective color inks in any order.

[0057] The printed matter 300 of this embodiment is suitable for visually appealing products such as advertising and other posters, bags and accessories with a transparent fabric layer on the surface, magazine and book pages that are intended to be aesthetically pleasing, wallpaper, jigsaw puzzles, and the like.

[0058] The present invention has been described above based on several embodiments. These embodiments are merely examples, and it will be understood by those skilled in the art that various modifications and changes are possible within the scope of the claims of the present invention, and that such modifications and changes are also within the scope of the claims of the present invention. [Explanation of symbols]

[0059] 300 printed matter, 302 substrate, 304 printed layer, 306 white backing layer, 322 red dots, 324 green dots, 326 blue dots, 328 white dots, 330 important color dots.

Claims

1. A transparent or semi-transparent substrate; A printing layer formed on the substrate; A backing layer covering the printing layer; Equipped with The printed layer includes red dots containing a red color-producing substance that mainly emits red color, green dots containing a green color-producing substance that mainly emits green color, blue dots containing a blue color-producing substance that mainly emits blue color, and white dots containing a white fluorescent agent.

2. 2. The printed matter according to claim 1, wherein the printing layer further includes important color dots to be made conspicuous, the important color dots being disposed on a surface of the printing layer in contact with the substrate.

3. 3. The printed matter according to claim 1, wherein the backing layer is printed with a white ink.

4. A first step of forming a printing layer on a transparent or semi-transparent substrate by a stencil printing method; A second step of backing the printed layer to cover it; Including, The first step is a printing method in which the printed layer is formed using a plurality of dots each containing a color-developing substance of a different color and white dots containing a white fluorescent agent.

5. 5. The printing method according to claim 4, wherein the first step forms a printing layer on the assumption that the printed matter will be viewed through the substrate.

Images