Preparation method for refraction three-dimensional colorful effect and printed matter

Abstract

The invention discloses a preparation method of a refractive three-dimensional colorful effect and a printed matter, and the method comprises the following steps: arranging a color ink combination on a metallic luster layer of a printing stock, and at least partially overlapping the color ink combination with the metallic luster layer; first refraction embossing treatment is carried out on the color ink combination, a first refraction pattern with a first refraction angle is prepared, and at least part of the first refraction pattern is overlapped with the color ink combination; silk-screening a field transparent gloss oil layer on the surface of the first refraction line, semi-curing the field transparent gloss oil layer, and at least partially overlapping the field transparent gloss oil layer with the first refraction line; second refraction embossing treatment is conducted on the semi-cured on-site transparent gloss oil layer, second refraction lines with a second refraction angle are prepared, the on-site transparent gloss oil layer is cured, orthographic projections of the second refraction lines and orthographic projections of the first refraction lines on the metal luster layer have a limited number of intersection points, and the intersection points have a limited number of intersection points; the problem that the refraction expression effect of the silk-screen refraction lines is poor is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of combined printing, and particularly relates to a preparation method for a refractive three-dimensional dazzling effect and printed matter. Background Art

[0002] In the printing and packaging industry, the surface decoration processes of conventional printing substrates (such as paper, PET film, etc.) mainly include hot stamping (such as hot stamping, cold stamping), silk screen printing, reverse printing, embossing, and labeling, etc. Usually, one or more of these processes are used to achieve the surface decoration effect of printed packaging products.

[0003] The refractive performance effect is one of the more common effects in the surface decoration effects of printed packaging products. The existing manufacturing processes for the refractive performance effect on the surface of printing substrates are mainly divided into two categories: The first category is when manufacturing lithographic paper in the prepress stage, the refractive effect is achieved through lithographic die stamping; the second category is when processing the surface of the printing substrate in the postpress stage, the refractive effect is achieved based on refractive embossing or silk screen printing of refractive patterns on the surface of a metallic gloss layer (such as aluminized paper or gilded surface). For the first category of manufacturing processes, the lithography cost is high and there is no tactile effect; for the second category of manufacturing processes, for the refractive embossing process, after the embossing plate is imprinted on the surface of the metallic gloss layer, fine cracks that are difficult to see with the naked eye are easily generated, and these cracks will cause diffuse and scattering effects on light, so macroscopically, the refractive performance effect is usually not clear enough and not delicate enough; for the silk screen printing of refractive patterns process, when silk screening fine lines of light oil and curing to prepare refractive patterns, there are easily problems of a certain degree of poor forming effect and collapse, so macroscopically, the refractive performance effect is usually not delicate and sharp enough. In addition, the existing refractive performance effects are relatively single as a whole, the technical barriers of the process are low, and the imitation difficulty is small. Summary of the Invention

[0004] In view of the above deficiencies of the prior art, the purpose of the present invention is to provide a preparation method for a refractive three-dimensional dazzling effect, which can make the surface of the printing substrate present a refractive three-dimensional dazzling effect.

[0005] To solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A preparation method for a refractive three-dimensional dazzling effect, which includes:

[0007] Setting a color ink combination on the metallic gloss layer of the printing substrate, at least part of the color ink combination overlapping with the metallic gloss layer;

[0008] Performing a first refractive embossing treatment on the color ink combination to prepare a first refractive pattern with a first refractive angle, at least part of the first refractive pattern overlapping with the color ink combination;

[0009] A solid transparent varnish layer is provided on the first refractive pattern surface, and the solid transparent varnish layer is semi-cured, with at least part of the solid transparent varnish layer overlapping the first refractive pattern;

[0010] Second refractive embossing is performed on the semi-cured solid transparent varnish layer to prepare a second refractive pattern with a second refractive angle, and the solid transparent varnish layer is cured, and the second refractive pattern and the first refractive pattern have a limited number of intersection points in the orthographic projection on the metallic luster layer.

[0011] In the method for preparing the refractive three-dimensional colorful effect, the ink combination includes a first ink layer.

[0012] In the method for preparing the refractive three-dimensional colorful effect, the first ink layer and the metallic luster layer have a first color difference, and the first ink layer partially or completely covers the metallic luster layer.

[0013] In the method for preparing the refractive three-dimensional colorful effect, the ink combination further includes a second ink layer, the second ink layer is stacked on the first ink layer, the second ink layer and the first ink layer have a second color difference, and the second ink layer partially or completely covers the first ink layer.

[0014] In the method for preparing the refractive three-dimensional colorful effect, the ink combination has micro-explosion color fissures at the overlapping part with the first refractive pattern.

[0015] In the method for preparing the refractive three-dimensional colorful effect, the first refractive pattern is a plurality of first concave fine lines and first convex fine lines that are arranged at intervals and have similar shapes.

[0016] In the method for preparing the refractive three-dimensional colorful effect, the distance between the first concave fine line and the first convex fine line is 0.08 - 0.7 mm, and the depth of the first concave fine line and the height of the first convex fine line are 0.5 - 1 mm.

[0017] In the method for preparing the solid transparent varnish layer, the transparent varnish includes: 40% - 60% of monomers, 35% - 50% of oligomers, 4% - 8% of photoinitiators, and 2% - 4% of additives.

[0018] In the method for preparing the refractive three-dimensional colorful effect, the transparent varnish further includes 5 - 10% of aluminum powder, and anodic oxidation or coloring treatment is performed on the aluminum powder.

[0019] A printed matter is prepared by using the preparation method of the refractive three-dimensional dazzling color effect, and it includes: a substrate, a metallic luster layer is provided on the substrate, at least part of the area of the metallic luster layer is provided with a color ink combination, at least part of the area of the color ink combination has a first refractive pattern area, a solid transparent varnish layer is provided on the color ink combination of the first refractive pattern area, at least part of the area of the solid transparent varnish layer has a second refractive pattern area, and the second refractive pattern and the orthographic projection of the first refractive pattern on the metallic luster layer have a limited number of intersection points.

[0020] Compared with the prior art, in the preparation method of the refractive three-dimensional dazzling color effect provided by the present invention, first, a color ink combination is provided on the surface of the metallic luster layer on the surface of the substrate, and secondly, a first refractive embossing treatment is performed on the surface of the color ink combination. While obtaining the first refractive pattern, the first refractive embossing treatment can cause micro-explosion color cracks in the color ink combination, so that the color of the metallic luster layer can be presented through the micro-explosion color cracks, and a first refractive effect is generated through the first refractive pattern; thirdly, a transparent varnish layer is provided on the surface of the first refractive pattern of the color ink combination and semi-cured, and finally, a second refractive embossing treatment is performed on the semi-cured transparent varnish layer to obtain a second refractive pattern. The color of the metallic luster layer presented through the micro-explosion color cracks can generate a second refractive effect through the second refractive pattern. Since the first refractive pattern and the second refractive pattern are stacked in space, therefore, the first refractive effect and the second refractive effect can present a multiple refractive three-dimensional dazzling color effect in the human eye. The present invention can effectively improve the clarity of the refractive embossing on the surface of the metallic luster layer by providing a transparent varnish layer on the surface of the first refractive pattern. Performing a refractive embossing treatment on the surface of the semi-cured transparent varnish layer can effectively solve the problem that the refractive performance of the refractive pattern in the prior art is not good, making it clearer, more delicate and sharp, and the refractive performance is better. And when the color ink combination includes a first color ink layer and a second color ink layer arranged in a stacked manner, the micro-explosion color cracks will present the color of the metallic luster layer and the color of the first color ink layer at the same time, and the refractive effect presented by the first refractive effect and the second refractive effect in the human eye will be more abundant. At the same time, the technical barrier of the refractive process is improved, and the difficulty of imitation is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a flowchart of the preparation method of the refractive three-dimensional dazzling color effect provided by the present invention.

[0022] Figure 2 It is a flowchart of an application embodiment of the preparation method of the refractive three-dimensional dazzling color effect provided by the present invention.

[0023] Figure 3 It is a schematic diagram of the preparation effect of the first substrate in the preparation method of the refractive three-dimensional dazzling color effect provided by the present invention.

[0024] Figure 4Schematic diagram of the preparation effect of the second substrate in the preparation method of the refractive three-dimensional dazzling color effect provided by the present invention.

[0025] Figure 5 Partial enlarged display diagram of the physical object of the printed matter prepared by the preparation method of the refractive three-dimensional dazzling color effect provided by the present invention. Specific embodiments

[0026] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0027] The present invention relates to a refractive three-dimensional dazzling color process, and in particular to a light industrial manufacturing process for preparing a refractive three-dimensional dazzling color process effect product by optimizing and combining processes such as printing coating, hot stamping and embossing, belonging to the field of light industrial technology and engineering.

[0028] Please refer to Figure 1 A preparation method of a refractive three-dimensional dazzling color effect provided by the present invention includes:

[0029] S10. Set a color ink combination on the metallic gloss layer of the substrate, and at least part of the color ink combination overlaps with the metallic gloss layer;

[0030] S20. Perform a first refractive embossing treatment on the color ink combination to prepare a first refractive pattern with a first refractive angle, and at least part of the first refractive pattern overlaps with the color ink combination;

[0031] S30. Set a solid transparent varnish layer on the surface of the first refractive pattern and semi-cure the solid transparent varnish layer, and at least part of the solid transparent varnish layer overlaps with the first refractive pattern;

[0032] S40. Perform a second refractive embossing treatment on the semi-cured solid transparent varnish layer to prepare a second refractive pattern with a second refractive angle, and cure the solid transparent varnish layer, and the second refractive pattern and the first refractive pattern have a limited number of intersection points in the orthographic projection on the metallic gloss layer.

[0033] The preparation method of the refractive three-dimensional dazzling color effect provided by the present invention can not only effectively solve the problem of poor refractive performance of refractive embossing or screen printing refractive patterns on the surface of the metallic gloss layer, but also make the refractive performance effect more abundant, while improving the technical barrier of the refractive process and increasing the difficulty of imitation.

[0034] Optionally, the metallic gloss layer is an aluminum layer, and the substrate can be selected as aluminized paper, or non-aluminized paper, and then an electroaluminum layer is hot-stamped on the non-aluminized paper (such as Figure 4As shown, a color ink combination is then provided on the aluminum layer and cured, and the color ink combination at least partially overlaps with the aluminum layer region.

[0035] In this embodiment, the color ink combination only includes a first color ink layer.

[0036] Specifically, the first color ink layer is stacked above the metallic luster layer, and the first color ink layer has a first color difference from the metallic luster layer. The first color ink layer can partially or completely cover the metallic luster layer. When a first refractive embossing process is performed on the first color ink layer, at the overlapping portion of the first refractive pattern and the first color ink layer, micro-explosion color cracks will be generated, and the color of the metallic luster layer can be revealed through the micro-explosion color cracks.

[0037] Furthermore, in Figure 3 and Figure 4 the embodiment shown, the color ink combination further includes a second color ink layer. The second color ink layer is stacked above the first color ink layer, and the second color ink layer has a second color difference from the first color ink layer. When a first refractive embossing process is performed on the color ink combination, at the overlapping portion of the first refractive pattern and the color ink combination, micro-explosion color cracks will be generated, and the color of the metallic luster layer and the color of the first color ink layer can be revealed through the micro-explosion color cracks.

[0038] Optionally, the second color ink layer partially or completely covers the first color ink layer.

[0039] Preferably, the printing areas and thicknesses of the first color ink layer and the second color ink layer are the same. Of course, it is also possible to adopt the method of the second color ink layer partially covering the first color ink layer.

[0040] In specific implementation, the printing substrate has a high flatness and a certain basis weight range. The flatness error range is preferably ±0.1 - ±0.3 mm, and the basis weight range is preferably 180 - 350 g / m 2 of cardboard, and more preferably 220 - 350 g / m 2 of cardboard.

[0041] Preferably, the color ink combination is obtained by UV ink printing. The first color ink layer has a large color difference from the underlying metallic luster layer, such as black ink. The second color ink layer has a large color difference from the first color ink layer (where the large color difference means beyond the tolerance range of the human eye), such as blue, red, etc. For the two groups of different inks, it is preferred that the dot area ratio of the graphics is not less than 75%, and more preferably solid (i.e., dot area ratio 100%) graphics. After printing the color ink combination, the curing power and printing speed parameter range ensure that the color ink combination is completely cured. Of course, the color ink combination can also include a third color ink layer or even more color ink layers, but the more color ink layers are overprinted, the slightly worse the refractive three-dimensional dazzling color effect will be. The present invention does not limit this.

[0042] The present invention realizes the setting of a color ink combination on a printing substrate through step S20, and performs a first refractive embossing process on the surface of the color ink combination, preparing a first refractive pattern with regular arrangement and refractive effect on its surface, such that at least part of the first refractive pattern overlaps with the color ink combination; the first refractive embossing process can microscopically generate micro-explosion color cracks invisible to the naked eye on the surface of the overlapping area of the color ink combination, as Figure 3 and Figure 4 shown, so that the color located below the first refractive embossing will be presented through the micro-explosion color cracks.

[0043] In an optional embodiment, the first refractive embossing treatment is first concave fine lines and first convex fine lines with regular arrangement changes and refractive effects. And a color ink combination is set and cured on aluminized paper, and the first refractive embossing treatment is performed on the cured color ink combination. Compared with the existing process of forming a refractive embossing on a film, there is no need for the process conditions that the die pressing or embossing die is transparent or the substrate is transparent, and the present invention can realize micro-explosion color cracks by preparing a first refractive embossing layer on the color ink combination.

[0044] Wherein, the step S20 includes:

[0045] Placing an imprinting component on the color ink combination, and pressing the color ink combination with pressure, such that at least part of the color ink combination forms a first refractive pattern, and the surface of the color ink combination with the first refractive pattern has micro-explosion color cracks, as Figures 3 to 5 shown.

[0046] Preferably, the imprinting pressure is 250 - 280 tons, and the pressing time is 0.9 - 1.5 seconds.

[0047] Wherein, the first refractive pattern is a number of first concave fine lines and first convex fine lines arranged at intervals and with similar shapes. Optionally, the distance between the first concave fine lines and the first convex fine lines is 0.08 - 0.7 mm, and the depth of the first concave fine lines and the height of the first convex fine lines are 0.5 - 1 mm. Of course, the orthographic projection shapes of the first concave fine lines and the first convex fine lines may also be the same, and the present invention does not limit this.

[0048] Preferably, the width and distance range of the first concave fine lines and the first convex fine lines in the first refractive pattern are preferably 0.15 - 0.35 mm, and the raised height or recessed depth range of the first concave fine lines and the first convex fine lines of the first refractive embossing plate for preparing the first refractive pattern relative to the plate plane is preferably 0.5 - 0.8 mm, that is, the depth of the first concave fine lines and the height of the first convex fine lines are preferably 0.5 - 0.8 mm.

[0049] The arrangement rule mentioned in the present invention refers to the arrangement mode in which the convex and concave patterns of the first refractive embossing have the same shape and spacing, such as the first concave fine lines and the first convex fine lines are all oblique straight lines set at the same angle, curves with the same curvature change, or in the shape of triangles, polygons, etc.

[0050] The present invention sets a solid transparent varnish process and semi-cures it on the surface of the first refractive pattern through step S30, and prepares a semi-cured solid transparent varnish layer on its surface, so that the semi-cured transparent varnish layer at least partially overlaps with the first refractive pattern; the semi-cured transparent varnish layer is fully leveled and has a certain thickness.

[0051] Because the semi-cured transparent varnish layer at least partially overlaps with the first refraction pattern, when the transparent varnish liquid fills the tiny and hard-to-see micro-burst color cracks at the first refraction pattern, it will weaken the diffuse reflection effect of the microscopic surface of the first refraction pattern on light, so that the originally scattered light passes through its surface more concentratedly, reducing scattering and enhancing transmission, so that the tiny and hard-to-see micro-burst color cracks at the first refraction pattern become clear and delicate, and the clarity is improved. Therefore, the color that is revealed at the micro-burst color cracks can be clearly observed. For example, when the color ink combination only includes the first color ink layer, the color of the metallic luster layer can be revealed at the micro-burst color cracks; when the color ink combination includes the first color ink layer and the second color ink layer that are stacked, the color of the metallic luster layer and the color of the first color ink layer can be revealed at the micro-burst color cracks. Since the metallic luster layer has a strong reflection characteristic, the refraction and colorful effect can be further highlighted.

[0052] In the step S30, the solid transparent varnish layer can be completed by screen printing, coating or gravure printing.

[0053] In this embodiment, the solid transparent varnish layer is completed by a screen printing process. Specifically, first, a screen plate is used to screen print a plastic transparent varnish layer on a partial area of ​​the surface of the first refractive pattern, and the plastic transparent varnish layer is filled with micro-color cracks. After the plastic transparent varnish layer is leveled, the leveled plastic transparent varnish layer is semi-cured.

[0054] Optionally, the mesh number range is 80-180 meshes and the pressure is 0.2-0.6Mpa.

[0055] Preferably, the mesh number range of the mesh is preferably 100-150 meshes. The mesh with a lower mesh number has a larger mesh hole, which makes it easier to achieve a thicker transparent varnish layer. Among the silk-screen printing process parameters, the silk-screen printing pressure range is preferably 0.3-0.6Mpa, and the silk-screen transparent varnish layer thickness range is 0.8-1.0mm.

[0056] Optionally, the thickness of the plastic transparent varnish layer is 0.8-1 mm.

[0057] Optionally, during the semi-curing process, the power of the curing light source is 100 - 1000 mW / cm 2 .

[0058] Preferably, the power of the curing light source is 300 - 700 mW / cm 2 , which can ensure that while the surface of the transparent varnish cures rapidly, a certain plasticity is still maintained inside, thus having good semi-curing forming stability, so as to be able to perform high-precision shaping during the second refractive embossing process.

[0059] Since step S40 needs to perform the second refractive embossing process on the surface of the semi-cured solid-field transparent varnish layer and make it plastically shaped with high precision according to the refractive patterns on the second refractive embossing plate, the present application provides a plastic solvent-free UV transparent varnish, which mainly includes components such as monomers, oligomers, photoinitiators, and additives. Among them, monomers with appropriate molecular weights and functional groups are selected to ensure that the varnish maintains a certain plasticity during the curing process; among them, oligomers are the viscous components of the varnish to provide the viscosity and elasticity after curing of the varnish layer, making it not easy to flow during embossing, and at the same time providing sufficient elasticity to adapt to the stress during the embossing process; among them, the types and proportions of photoinitiators can control the curing speed and depth to ensure that the semi-cured transparent varnish layer has both a certain fluidity and sufficient hardness to maintain the embossed shape; among them, additives are used to improve the processing performance and storage stability of the transparent varnish.

[0060] Specifically, the transparent varnish for preparing the plastic transparent varnish layer includes: 40% - 60% of monomers, 35% - 50% of oligomers, 4% - 8% of photoinitiators, and 2% - 4% of additives.

[0061] In a specific embodiment, the monomers include 30 - 40% of hydroxyethyl acrylate and 10 - 20% of hexanediol diacrylate; the oligomers include 22 - 30% of epoxy acrylate and 13 - 20% of polyurethane acrylate; the photoinitiators include 3 - 5% of 2-hydroxy-2-methyl-1-phenylpropanone and 1 - 3% of isopropyl thioxanthone; the additives include 1 - 2% of leveling agent, 0.5 - 1% of defoaming agent, and 0.5 - 1% of stabilizer, and the transparent varnish is obtained by mixing the above components.

[0062] Furthermore, the transparent varnish further includes 5 - 10% of aluminum powder, and when the aluminum powder is mixed with monomers, oligomers, photoinitiators, and additives, anodic oxidation or coloring treatment is performed on the aluminum powder. The present invention adds a certain proportion of aluminum powder pigment to the transparent varnish and mixes it evenly, and the second refractive embossing prepared on the surface of the semi-cured transparent varnish layer by the second refractive embossing process is completely cured, so that the second refractive pattern matches the first refractive pattern, jointly constituting the third refractive pattern effect.

[0063] The present invention realizes adding a certain proportion of aluminum powder pigment to the above-mentioned formulated transparent varnish and mixing evenly. The proportion of aluminum powder is preferably in the range of 5-10%, achieving a certain transparency while increasing the metallic texture of the varnish, and at the same time maintaining the stability of printing suitability. The aluminum powder pigment can be treated by methods such as anodic oxidation or coloring treatment to make the metallic texture hue it possesses the same as or similar to the metallic texture hue presented by the first set of color inks under the metallic luster reflection of the micro-explosion color cracks at the first refractive pattern, thereby making the third refractive pattern effect formed by the second refractive pattern matching the first refractive pattern more uniform and consistent, and further improving the technical barrier.

[0064] In step S40 of the present invention, on the surface of the semi-cured solid transparent varnish layer, a second refractive embossing process is carried out to prepare regularly arranged second refractive patterns with a refractive effect on its surface, making it completely cured, and making the orthographic projection of the second refractive pattern and the first refractive pattern on the metallic luster layer have a limited number of intersection points. At this time, at least part of them do not overlap, that is, the arrangement angle and position between the first refractive pattern and the second refractive pattern are different. As Figure 3 and Figure 4 shown; thus, on the basis of the refractive and colorful effect prepared in step 20, a second refractive embossing process is carried out on a transparent varnish layer with a certain thickness to further prepare a light industrial product with a multi-refractive three-dimensional colorful process. The final effect is as Figure 5 shown, as Figure 5 a three-dimensional colorful effect can be seen on the metallic luster layer. Through Figure 5 it can be seen that its refractive performance effect is clear, delicate and sharp, and at different viewing distances and angles, its color effect and different refractive performance effects are more abundant.

[0065] It should be understood that when the orthographic projection of the second refractive pattern and the first refractive pattern on the metallic luster layer has an infinite number of intersection points, at this time, the two completely overlap, that is, the arrangement angle and position between the first refractive pattern and the second refractive pattern are exactly the same. Therefore, the first refractive effect generated by the first refractive pattern and the second refractive effect generated by the second refractive pattern will also coincide, which will inhibit the presentation of the three-dimensional effect of the process.

[0066] Compared with the existing process of performing refraction on a PET film, the present invention is directly prepared on the color ink combination during the second refractive embossing, without the need for an additional mask layer process, which is simple and low-cost.

[0067] Optionally, step S40 includes: placing the embossing assembly on the solid transparent varnish layer, pressing the solid transparent varnish layer, so that second refractive patterns are formed on at least part of the solid transparent varnish layer, and the concave and convex fine lines of the second refractive pattern have different refractive angles and distribution positions from those of the concave and convex fine lines of the first refractive pattern.

[0068] Optionally, the embossing pressure is 250 - 260 tons and the lamination time is 0.9 - 1.5 seconds.

[0069] Preferably, when performing the second refractive embossing, the second concave fine lines and second convex fine lines with regularly changing arrangements and having a refractive effect are arranged on the second refractive embossing plate for the second refractive embossing process. The line width and spacing range, the fine line convex height or concave depth range, etc. of the second concave fine lines and second convex fine lines are the same as those of the first refractive embossing plate. The same regularly changing arrangement of the second refractive embossing also means that the shapes and spacings of the second concave fine lines and second convex fine lines are the same.

[0070] The following combines Figures 2 to 5 , and specific embodiments are given to illustrate in detail the preparation method of the refractive three - dimensional dazzling effect of the present invention:

[0071] Step 1: Perform graphic design and process layout according to the effect of the refractive three - dimensional dazzling process product. When the substrate is selected as aluminized paper, the process route ① in Figure 2 is adopted to directly set the ink combination on its surface. As shown in Figure 3 , the ink combination is set on the surface of the hot stamping metallic luster layer and cured; when the substrate is selected as non - aluminized paper, after hot stamping electro - aluminum on the surface of the non - aluminized paper (such as the process route ② in Figure 2 ), then the ink combination is set on the surface of the hot stamping metallic luster layer and cured (such as the process route ③ in Figure 2 ), so that the ink combination at least partially overlaps with the hot stamping area, as shown in Figure 4 .

[0072] In this embodiment, an aluminized paper substrate with a basis weight of 220 g / m 2 is selected. The ink combination includes a first ink layer and a second ink layer arranged in layers. And the first ink layer and the second ink layer are printed with different UV inks. Among them, the first ink layer selects an ink with a hue that is quite different from the metallic luster of the aluminized paper, and its lightness and saturation are relatively high, and it is fully radiation - cured after printing; the second ink layer selects an ink with a hue that is quite different from that of the first ink layer, and its lightness is relatively low, and it is fully radiation - cured after printing.

[0073] Step 2: Perform the first refractive embossing process on the surface of the ink combination. The line width and spacing of the concave - convex fine lines on the first refractive embossing plate are both 0.15 mm, and the convex height or concave depth is 0.8 mm; the closing pressure is 260 tons and the closing time is maintained for 0.9 seconds. The first refractive pattern is prepared on the surface of the ink combination. At this time, micro - explosion color fissures that are difficult to see with the naked eye will be generated at the overlapping part of the ink combination and the first refractive pattern.

[0074] Step 3: Screen-print the transparent varnish provided by the present invention on the surface of the first refractive pattern, and prepare a solid transparent varnish layer with a certain thickness and sufficient leveling and semi-cure it; during screen printing, the mesh count of the screen is selected as 100 meshes, the screen printing pressure is set at 0.5 Mpa, and the thickness of the prepared transparent varnish layer is about 0.9 mm; the power of the curing light source is set at 500 mW / cm 2 .

[0075] Step 4: Perform a second refractive embossing process on the surface of the semi-cured solid transparent varnish layer, and prepare regular and arranged second refractive patterns with a refractive effect on its surface and fully cure them. The positive projections of the second refractive patterns and the first refractive patterns on the metallic luster layer have a limited number of intersection points, and the arrangement angles and positions between the second refractive patterns and the first refractive patterns are different. Thus, a sample of a light industrial product with a refractive three-dimensional colorful effect is prepared. This sample can be used for the production of packaging boxes, labels, cards, etc.

[0076] It should be noted that when the color ink combination includes a first color ink layer and a second color ink layer arranged in layers, the printing structures of each layer are in an overprinting manner. To clearly show the preparation method of the present application, Figure 3 and Figure 4 auxiliary illustrations are made using diagrams with a perspective effect. If Figure 3 and Figure 4 are deleted, it has no impact on the technical solution of the present invention. And since the wireframe diagram cannot reflect the refractive three-dimensional colorful effect of the present invention, the present invention uses a physical diagram for display, but Figure 5 the three-dimensional colorful effect in Figure 5 is only a display of partial colorful effects and cannot be understood as only the colorful effects shown in Figure 5 . Similarly, if

[0077] is deleted, it has no impact on the technical solution of the present invention. Figure 5 as shown

[0078] In summary, for the light industrial products (such as packaging boxes, labels, cards, etc.) with refractive three-dimensional dazzling color effects prepared by the preparation method of refractive three-dimensional dazzling color effects of the present invention, the solid silk-screened transparent varnish layer can effectively improve the clarity of the refractive embossing on the surface of the metallic luster layer. Setting refractive embossing on the surface of the semi-cured transparent varnish layer can effectively solve the problem of poor refractive performance of the silk-screened refractive pattern, making it clearer, finer, sharper, and with better refractive performance. Especially when the color ink combination includes the first color ink layer and the second color ink layer, the micro-explosion color fissures generated by the first refractive embossing can make the refractive effect more abundant under the coverage of the transparent varnish layer, while improving the technical barrier of the refractive process and increasing the difficulty of imitation.

[0079] It can be understood that for those of ordinary skill in the art, equivalent substitutions or changes can be made according to the technical solutions and inventive concepts of the present invention, and all such changes or substitutions should fall within the protection scope of the claims appended to the present invention.

Claims

1. A method for preparing a refractive three-dimensional colorful effect, characterized in that: include: Disposing a color ink combination on the metallic gloss layer of the substrate, wherein the color ink combination at least partially overlaps the metallic gloss layer; Performing a first refraction embossing process on the color ink combination to obtain a first refraction pattern with a first refraction angle, wherein the first refraction pattern at least partially overlaps with the color ink combination; A solid transparent varnish layer is disposed on the surface of the first refractive pattern, and the solid transparent varnish layer is semi-cured, wherein the solid transparent varnish layer at least partially overlaps with the first refractive pattern; A second refractive embossing process is performed on the semi-cured solid transparent varnish layer to prepare a second refractive pattern with a second refractive angle, and the solid transparent varnish layer is cured, and the second refractive pattern has a limited number of intersections with the orthographic projection of the first refractive pattern on the metallic gloss layer.

2. The method for preparing a refractive three-dimensional colorful effect according to claim 1, characterized in that: The color ink combination includes a first color ink layer.

3. The method for preparing a refractive three-dimensional colorful effect according to claim 2, characterized in that: The first color ink layer and the metallic gloss layer have a first color difference, and the first color ink layer partially or completely covers the metallic gloss layer.

4. The method for preparing a refractive three-dimensional colorful effect according to claim 3, characterized in that: The color ink combination also includes a second color ink layer, which is stacked on the first color ink layer. The second color ink layer has a second color difference with the first color ink layer, and the second color ink layer partially or completely covers the first color ink layer.

5. The method for preparing the refractive three-dimensional colorful effect according to claim 1, characterized in that: The color ink combination has a micro color crack at the overlap with the first refraction pattern.

6. The method for preparing a refractive three-dimensional colorful effect according to claim 1, characterized in that: The first refraction patterns are a plurality of first concave fine lines and first convex fine lines that are arranged at intervals and have similar shapes.

7. The method for preparing a refractive three-dimensional colorful effect according to claim 6, characterized in that: The distance between the first concave fine lines and the first convex fine lines is 0.08-0.7 mm, and the depth of the first concave fine lines and the height of the first convex fine lines are 0.5-1 mm.

8. The method for preparing a refractive three-dimensional colorful effect according to claim 1, characterized in that: The transparent varnish used for preparing the solid transparent varnish layer comprises: 40%-60% of monomers, 35%-50% of oligomers, 4%-8% of photoinitiators, and 2%-4% of auxiliary agents.

9. The method for preparing a refractive three-dimensional colorful effect according to claim 8, characterized in that: The transparent varnish also includes 5-10% of aluminum powder, and the aluminum powder is anodized or colored.

10. A printed product, prepared by the method for preparing a refractive three-dimensional colorful effect according to any one of claims 1 to 9, characterized in that: include: A printing material, wherein a metallic gloss layer is arranged on the printing material, a color ink combination is arranged on at least a portion of the metallic gloss layer, at least a portion of the color ink combination has a first refraction pattern area, a solid transparent varnish layer is arranged on the color ink combination in the first refraction pattern area, at least a portion of the solid transparent varnish layer has a second refraction pattern area, and the second refraction pattern has a finite number of intersections with the orthographic projection of the first refraction pattern on the metallic gloss layer.

Images