Medium with multidirectional latent image, process method for finishing and forming medium on packaging surface and manufacturing method of multidirectional latent image texture

Abstract

The invention provides a medium with a multidirectional latent image, a process method for finishing and forming the medium on the surface of a package and a manufacturing method of multidirectional latent image texture.The medium with the multidirectional latent image comprises a texture layer and a latent image showing layer, the texture layer is coated on the surface of a base material, the latent image showing layer is arranged on the texture layer, and the texture layer is coated on the latent image showing layer. One part of the latent image development layer is contacted with the texture layer, and the rest part of the latent image development layer is contacted with the surface of the base material. The manufacturing method of the multidirectional latent image texture is used for manufacturing a base oil texture pattern for forming a multidirectional latent image medium. The process method for finishing and forming the multidirectional latent image medium on the surface of the package is used for forming the multidirectional latent image medium on the package. The forming process of the multidirectional latent image medium can be perfectly combined with a common reverse UV process on the basis of combining design textures, the forming process is simple, rapid, efficient and low in cost, and hiding of multidirectional latent images can be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of packaging printing surface finishing technology, in particular to a medium with multi-directional latent images and a process method for finishing and forming the medium on the packaging surface, and a method for manufacturing the multi-directional latent image texture. Background Art

[0002] There are many kinds of surface finishing processes for high-quality packaging, mainly including laminating, hot stamping, UV oil coating, embossing, die-cutting creasing, reverse frosting, freezing point snowflakes, etc. These processes use different technical means to enhance the visual effect and texture of packaging. For example, laminating can increase the glossiness and waterproof and antifouling properties of paper, hot stamping gives the packaging a metallic texture and high-end feel, and UV oil coating can enhance the delicate layers and artistic effects of graphics. In addition, the embossing process creates a three-dimensional relief effect on the packaging surface through mold shaping, increasing visual impact. The comprehensive application of these processes not only enhances the added value of the product, but also meets the market demand for high-end packaging.

[0003] The reverse UV process is an advanced surface finishing technology that creates a high gloss and matte contrast effect on the surface of printed products, and has a strong frosted texture and three-dimensional touch. It is widely used in packaging materials that require a three-dimensional and high-end feel, such as high-end gift boxes, cosmetic packaging, and book covers. The reverse UV process prints transparent reverse ink on the non-bright parts of the design draft, and then prints and solidifies the surface UV varnish in a full-page manner, so that the varnish and reverse ink interact to produce a cohesive reaction, forming a matte or pockmarked effect, while the high-gloss parts form a mirror-like high-gloss effect. Although this process enhances the visual impact and beauty of printed products, it also improves the light resistance, heat resistance, and moisture resistance of the ink, and can effectively protect the imprint, but its visual effect is relatively simple (mainly the contrast between high gloss and matte effects).

[0004] In order to enrich the visual effect of this process, it is necessary to develop new application process technologies to improve it. In the existing technology, for example, Chinese patent CN107199799B combines this process with pre-press pattern design to achieve the effect of bidirectional refraction latent image / latent image, which can display two different text or graphic information at two different observation angles and increase certain anti-counterfeiting functions.

[0005] Latent image technology originates from banknote printing technology. It is a method of hiding text or graphics in the pattern by utilizing the change in ink thickness or the difference in line arrangement. When observed from different angles, the hidden pattern can be seen or not, thereby achieving a certain anti-counterfeiting purpose, such as Chinese patents CN100359098C, CN100360323C, CN101239561B, CN105672042B; European patent EP2727741B1; U.S. patents US7906198B2, US11317001B2; Japanese patents JP5493109B2, JP5499301 B2, JP2003182202A, JPWO2013054603A1; Korean patent KR101764781B1, etc. are all based on the ink thickness and / or line arrangement to achieve the latent image effect. The main disadvantage of this type of technical solution is that it only has a bidirectional refractive latent image effect, and because the effect is achieved by line arrangement, the line expression effect will be significantly different from the original high gloss and matte contrast effect. The overall uniformity of the surface light, matte, three-dimensional and other visual and tactile effects is poor, and other areas need to be unified into linear expressions of light, matte, three-dimensional and other visual and tactile effects, but this will result in the monotony of the design method. In Chinese patents CN112025230B, CN100427320C and Korean patents KR101221229B1, KR102020244B1, and KR102514746B1, it is proposed that a latent image effect in multiple directions is achieved based on an orthogonal lattice and three-dimensional protrusions. The overall visual and tactile effects of the orthogonal lattice and three-dimensional protrusions, such as light, matte, and three-dimensional, can be better integrated with the original high gloss and matte contrast effects, and the overall visual and tactile effect will be more unified, making the diversity of design methods better. However, this type of technical solution for achieving latent image effects in multiple directions based on an orthogonal lattice and three-dimensional protrusions requires a high-precision CNC high-speed engraving machine to pre-engraving the mold / master plate, and then the mold / master plate is used to make a printing plate that can be used for printing. The production cost of the mold / master plate and the printing plate is high, and this type of printing plate is equivalent to an engraved gravure anti-counterfeiting process or a precision embossing anti-counterfeiting process. The equipment and technology are all controlled products, and it is difficult to apply commercial products.

[0006] Therefore, there is an urgent need to develop a process technology that is low in cost, highly integrated with the reverse UV process, flexible in design and capable of achieving multi-directional latent image / latent image effects, to solve this technical problem. Summary of the invention

[0007] The object of the present invention is to provide a medium with a multi-directional latent image, which forms a multi-directional latent image medium composed of multi-directional periodic texture and information texture through the protrusion array formed by the mutual repulsion of texture base oil and surface oil under the combined effect of reflection and shielding of light; the present invention also provides a method for making a multi-directional latent image texture, which is used to make a base oil texture pattern that forms a multi-directional latent image medium; at the same time, the present invention also provides a process method for finishing and molding the multi-directional latent image medium on the packaging surface, which is used for the molding application of the multi-directional latent image medium on the packaging, so as to solve the problems raised in the above-mentioned background technology.

[0008] In order to solve the above technical problems, the technical solutions provided by the present invention are as follows:

[0009] The present invention provides a medium with a multi-directional latent image, the medium is arranged on the surface of a substrate, the medium comprises a texture layer and a latent image display layer, and is characterized in that: the texture layer is coated on the surface of the substrate, the latent image display layer comprises a first part in contact with the texture layer, and a second part in contact with the surface of the substrate, wherein:

[0010] The texture layer is provided with an array of blank areas, the texture layer includes a modulated texture portion and a non-modulated texture portion, the modulated texture portion is complementary to the non-modulated texture portion;

[0011] The latent image display layer is composed of an array of protrusions, and the array of the protrusions is consistent with the array of the blank areas set in the texture layer;

[0012] The latent image development layer has a height greater than that of the texture layer.

[0013] In one embodiment, the medium having the multi-directional latent image also has a tone change, and the tone change is controlled by the tone change of the selected image.

[0014] In one embodiment, the texture layer is printed by base oil, and the latent image display layer is printed by surface oil and condensed.

[0015] In one embodiment, the protrusions in the array include protrusions having different shapes, sizes and heights.

[0016] The present invention also provides a method for producing a multi-directional latent image texture, wherein the multi-directional latent image texture is used to produce a texture layer of a medium having a multi-directional latent image, wherein the texture layer is printed by a primer, and the method comprises the following steps:

[0017] S1 makes tiled patterns: using the semi-regular tessellation mode, regular triangles, regular quadrilaterals and regular hexagons with the same side length are arranged around a vertex to form a seamless tiled pattern;

[0018] S2 obtains the minimum tiling unit: a minimum tiling unit that can be tiled and restored to the original seamless tiling pattern is cut out from the seamless tiling pattern formed in step S1;

[0019] S3: making a minimum tile element: based on the size of the minimum tile unit formed in step S2, setting a component with the same size as the minimum tile unit, setting dots on the component corresponding to the intersection point in the minimum tile unit and the center point of the regular hexagon, and the shape of the dots is not limited, so as to form a minimum tile element;

[0020] S4 tiling: tiling and cutting out a texture pattern of a required size using the minimum tiling element formed in step S3;

[0021] S5 information modulation: based on the texture pattern formed in step S4, with text, graphics, and images as restriction units, multiple information modulation is performed from multiple modulation angles in the same area, forming a texture pattern of a modulated texture part within the restriction unit, and a texture pattern of a non-modulated texture part outside the restriction unit;

[0022] S6 stitching: Based on the texture pattern modulated in step S5, set a solid color block of the same size according to its size, set the texture pattern in step S5 to white, and place the white texture pattern on the solid color block to overlap and stitch together to form a multi-directional latent image texture required for the later production stage.

[0023] In one embodiment, the semi-regular mosaic pattern used in step S1 is specifically a 4-3-4-6 mosaic pattern.

[0024] In one embodiment, the modulation angle in step S5 is one of five angles of 0°, 30°, 150°, 240° and 300° in the clockwise or counterclockwise direction. At least two of the angles are selected for modulation when information is modulated, and one layer of information is hidden under each modulation angle.

[0025] The present invention also provides a method for producing a multi-directional latent image texture, wherein the multi-directional latent image texture is used to produce a texture layer of a medium having a multi-directional latent image, wherein the texture layer is printed by a primer, and the method comprises the following steps:

[0026] S1' makes a tile pattern: using a semi-regular tessellation mode, regular triangles, regular quadrilaterals and regular hexagons with the same side length are arranged around a vertex to form a seamless tile pattern;

[0027] S2' obtains the minimum tiling unit: cuts out a minimum tiling unit that can be tiled back to the original seamless tiling pattern from the seamless tiling pattern formed in step S1';

[0028] S3' prepares the minimum tile element: based on the size of the minimum tile unit formed in step S2', sets an element with the same size as the minimum tile unit, sets the center point of the halftone dot on the element corresponding to the intersection point in the minimum tile unit and the center point of the regular hexagon, and sets a gradient ascending line of the dot amplitude modulation change extending outward based on the center point, and constructs the minimum threshold matrix of the image halftoning by this, and the dot shape is not limited;

[0029] S4' tiling: tiling the minimum threshold matrix formed in step S3' according to the size of the image to be halftoned to obtain the threshold matrix of the entire image, and halftoning the entire control image to form a texture pattern with tone changes;

[0030] S5' information modulation: based on the texture pattern formed in step S4', with text, graphics, and images as limiting units, multiple information modulation is performed from multiple modulation angles in the same area, forming a texture pattern of a modulated texture part within the limiting unit, and a texture pattern of a non-modulated texture part outside the limiting unit;

[0031] S6' stitching: Based on the texture pattern modulated in step S5', set a solid color block of the same size according to its size, set the texture pattern in step S5' to white, and place the white texture pattern on the solid color block to overlap and stitch together to form a multi-directional latent image texture required for the later production stage.

[0032] The present invention also provides a process for finishing and forming a medium with a multi-directional latent image on a packaging surface, comprising the following steps:

[0033] S10: preparing a file: preparing a multi-directional latent image texture by using the method for preparing a multi-directional latent image texture as described in any of the preceding items, and forming a texture file based on the multi-directional latent image texture;

[0034] S20 texture printing: printing the required decorative pattern on the packaging substrate, and printing with a primer according to the texture file formed in step S10, and drying to form a texture layer of the medium with a multi-directional latent image;

[0035] S30 coating and polycondensation: on the packaging substrate in step S20, a surface oil is coated on the surface of the packaging substrate using an anilox roller, and polycondensation and drying are performed to form a latent image display layer of the multi-directional latent image medium;

[0036] S40 packaging molding.

[0037] In one embodiment, the top coat used in step S30 and the base coat used in step S20 are mutually exclusive, and the top coat is condensed into protrusions under the repulsive effect of the base coat.

[0038] The technical solution provided by the present invention has the following technical effects:

[0039] Firstly, the present invention adopts a semi-regular mosaic pattern to produce a minimum tiling element, and the multi-directional latent image texture file formed after tiling has a dot array method that is more random than the traditional orthogonal dot matrix method. If it is spliced ​​with a random matte texture, it will have better integration. At the same time, the dot array method of the present invention has 5 modulation directions of different angles on a single layer of dots, which is 3 more angles than a single layer of orthogonal dot matrix.

[0040] Secondly, under the same tiny protrusion effect, the orthogonal dot matrix can only hide two pieces of information in its two modulation directions, and the non-modulation area will not produce other obvious texture changes when observed at the modulation angle because there is no light blocking effect. The multi-directional latent image medium of the present invention, in which the tiny protrusion array is modulated, can hide up to five pieces of information. At the same time, because of the multi-angle dot arrangement of the non-modulation area, when observed at one modulation angle, the dots at other angles will form a more regular light blocking and produce obvious periodic texture changes, forming a non-modulation refractive latent image texture.

[0041] Finally, the molding process of the multi-directional latent image medium of the present invention can be perfectly combined with the ordinary reverse UV process on the basis of combining the designed texture. The molding process is simple, fast, efficient, low-cost, and can achieve the hiding of multi-directional latent images. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic diagram of the cross-sectional layer structure of the multi-directional latent image medium of the present invention;

[0043] Figure 2 It is a schematic diagram of the semi-regular tessellation tiling pattern and the minimum tiling unit cutting of the present invention;

[0044] Figure 3 It is a schematic diagram of the minimum tiling element of the present invention;

[0045] Figure 4 A schematic diagram of a texture pattern to be modulated with information according to the present invention;

[0046] Figure 5 A schematic diagram of using a restriction unit to perform partition modulation on a texture pattern to be modulated with information according to the present invention;

[0047] Figure 6 A schematic diagram of modulation angles available for information modulation of the present invention;

[0048] Figure 7 Schematic diagram of the multi-directional latent image texture of the present invention. DETAILED DESCRIPTION

[0049] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. It is understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention are shown in the drawings, not all. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0050] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0052] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0053] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0054] Example 1

[0055] like Figure 1As shown, this embodiment provides a medium 100 with a multi-directional latent image, wherein the medium 100 with a multi-directional latent image is arranged on the surface of a substrate 3, and the medium 100 with a multi-directional latent image includes a texture layer 1 and a latent image-revealing layer 2, wherein the texture layer 1 is coated on the surface of the substrate 3, the latent image-revealing layer 2 is higher than the texture layer 1, and the latent image-revealing layer 2 includes a first portion in contact with the texture layer 1, and a second portion in contact with the surface of the substrate 3.

[0056] In this embodiment, the texture layer 1 is provided with an array of blank areas 13, the texture layer 1 includes a modulated texture portion 11 and a non-modulated texture portion 12, and the modulated texture portion 11 is complementary to the non-modulated texture portion 12, the texture layer 1 is printed with a primer, the thickness of the texture layer 1 is 2-4 microns, and the equipment used is at least a 5+1 color offset printing press, and the "1" in the "5+1 color offset printing press" refers to an anilox roller oiling unit. In some embodiments, the modulated texture portion 11 is not larger than the non-modulated texture portion 12.

[0057] In this embodiment, the latent image display layer 2 is composed of an array of protrusions 21, and the array mode of the protrusions 21 is consistent with the array mode of the blank area 13 set in the texture layer 1. The protrusions 21 are tiny protrusions. The latent image display layer 2 is printed and condensed by surface oil. The equipment used is the aforementioned offset printing machine with a screen roller oiling unit. The mesh number of the screen roller is 50-300 meshes. In this embodiment, a 100-mesh screen roller is used. The surface oil and base oil used are mutually exclusive. After the surface oil is transferred to the surface of the packaging substrate through the screen roller, it repels the printed and dried texture layer and quickly condenses to the area without printed base oil, that is, it condenses into tiny protrusions in the blank area of ​​the texture layer, and the condensed tiny protrusions are quickly solidified and formed by a UV light source.

[0058] The thickness of the surface oil coated by the anilox roller is directly related to the mesh number of the anilox roller. The higher the mesh number of the anilox roller, the thinner the thickness of the coated surface oil film layer. This is because the increase in the mesh number of the anilox roller means an increase in the number of meshes per unit area, which makes the distribution of the coating material per unit area more dense, resulting in a decrease in the thickness of the surface oil coating. The thickness of the formed surface oil film layer is 5-20 microns, and the surface oil film layer forms a protrusion 21 after condensation. It can be seen that the height of the latent image display layer 2 is greater than the height of the texture layer 1. Only when the height of the protrusion 21 is greater than the height of the texture layer 1 can a good light shielding, reflection and other effects be formed, and the effect of the multi-directional latent image medium 100 of the present invention can be finally achieved.

[0059] Due to the influence of multiple factors such as the uniformity of the surface oil film coating, the condensation rate, the adsorption of the packaging substrate, the UV drying rate, etc., the protrusions 21 of the array include protrusions 21 with different shapes, sizes and heights. However, under the effect of the blank areas 13 of the same size set in the texture layer 1, the appearance differences of the protrusions 21 will not be too obvious.

[0060] like Figure 2-7 As shown, the preparation of the texture layer in this embodiment provides a method for preparing a multi-directional latent image texture, wherein the multi-directional latent image texture is used to prepare a texture layer 1 of a medium 100 having a multi-directional latent image, wherein the texture layer 1 is printed with a primer, and comprises the following steps:

[0061] like Figure 2 As shown, S1 makes a tile pattern 4: using a semi-regular mosaic mode, regular triangles, regular quadrilaterals and regular hexagons with the same side length are arranged around a vertex to form a seamless tile pattern 4; the semi-regular mosaic mode used in this embodiment is specifically a 4-3-4-6 mosaic mode, that is, squares, regular triangles, squares and regular hexagons are arranged in sequence around each vertex, so that the sum of the angles at the vertex is 360° (90°+60°+120°+60°=360°), so seamless splicing can be repeated to form a regular plane mosaic. The side lengths of the regular triangles, regular quadrilaterals and regular hexagons used are all a millimeters, where a∈[0.08,0.25], preferably a∈[0.1,0.15], and a=0.127 millimeters in this embodiment.

[0062] S2 obtains the minimum tiling unit 5: a minimum tiling unit 5 that can be tiled and restored to the original seamless tiling pattern is cut out from the seamless tiling pattern 4 formed in step S1. The minimum tiling unit 5 in this embodiment is a rectangular shape.

[0063] like Figure 3 As shown, S3 makes the minimum tiling element 6: based on the size of the minimum tiling unit 5 formed in step S2, an element of the same size as the minimum tiling unit 5 is set, and dots 61 are set on the element corresponding to the intersection point in the minimum tiling unit 5 and the center point of the regular hexagon. The shape of the dots 61 is not limited, and the minimum tiling element 6 is formed. The shape of the dots 61 is not limited because the shape of the dots can be a closed figure such as a circle, an ellipse or a polygon. After the surface oil film layer is condensed, a protrusion 21 will be formed, but the bottom shape of the protrusion 21 is different. In this embodiment, circular dots are used. The size of the dots 61 determines the size of the blank area 13 of the texture layer 1, and the size of the blank area 13 determines the height of the protrusion 21 after the surface oil is condensed. The diameter of the circular dots is D mm, D∈[0.03,0.1], preferably D∈[0.04,0.07]. In this embodiment, D=0.05 mm.

[0064] like Figure 4 As shown, S4 tiling: tiling and cutting out a texture pattern 7 of a required size with the minimum tiling element 6 formed in step S3;

[0065] like Figure 5-6 As shown, S5 information modulation: based on the texture pattern 7 formed in step S4, with text, graphics, and images as limiting units 8, multiple information modulation is performed from multiple modulation angles in the same area, a texture pattern of a modulated texture portion 11 is formed in the limiting unit 8, and a texture pattern of a non-modulated texture portion 12 is formed outside the limiting unit 8. The limiting units 8 used in this embodiment are letters A, B, C, and D, and are respectively at different modulation angles, and the modulation angles are five angles of 0°, 30°, 150°, 240°, and 300° in the clockwise or counterclockwise direction. In order to achieve multiple information hiding during information modulation, at least two of the angles will be selected for modulation, and one layer of information is hidden under each modulation angle, so that the medium 100 with multi-directional latent images has latent images in at least two directions. In this embodiment, four modulation angles of A-30°, B-150°, C-240°, and D-300° are selected.

[0066] like Figure 7 As shown, S6 stitching: based on the texture pattern 7 modulated in step S5, a solid color block of the same size is set according to its size, the texture pattern 7 in step S5 is set to white, and the white texture pattern 7 is placed on the solid color block and overlapped and stitched together to form a multi-directional latent image texture 200 required for the later production link. A texture file can be formed based on the multi-directional latent image texture 200. The multi-directional latent image texture 200 refers to a latent image texture with at least two directions.

[0067] It should be noted that, in this embodiment, the side lengths of the regular triangle, regular quadrilateral and regular hexagon are all a=0.127 mm, and the diameter of the circular dot is D=0.06 mm, then the circular dot area S1=πD 2 / 4=0.002mm 2 , and the area occupied by each network point is theoretically or in The dot at this time is dot 61 at the center of the regular hexagon. Assuming that the surface oil in the area theoretically occupied by each dot 61 is all condensed into the blank area to form a spherical protrusion, the thickness of the surface oil film is H = 0.01mm, the height of the spherical protrusion is h, and assuming that the tiny protrusion is a spherical part with a height of h, then or So h≈0.063mm or h≈0.070mm (the dot is at the center of the regular hexagon).

[0068] This embodiment also provides a process for finishing and forming a medium with a multi-directional latent image on a packaging surface, comprising the following steps:

[0069] S10: creating a file: creating a multi-directional latent image texture 200 by using the method for creating a multi-directional latent image texture as described above, and forming a texture file based on the multi-directional latent image texture 200;

[0070] S20 texture printing: printing the required decorative pattern on the packaging substrate 3, and printing with a primer according to the texture file formed in step S10, and drying to form a texture layer 1 of the multi-directional latent image medium 100;

[0071] S30 coating and polycondensation: on the packaging substrate in step S20, a surface oil is coated on the surface of the packaging substrate 3 using an anilox roller, and polycondensation and drying are performed to form a latent image display layer 2 of the multi-directional latent image medium 100;

[0072] S40 packaging molding.

[0073] Example 2

[0074] The difference between this embodiment and the embodiment 1 is that the medium 100 having the multi-directional latent image also has a tone change, and the tone change is controlled by the tone change of the selected image.

[0075] Specifically, this embodiment provides a medium 100 with a multi-directional latent image, including a texture layer 1 and a latent image-revealing layer 2, wherein the texture layer 1 is coated on the surface of a substrate 3, the latent image-revealing layer 2 is higher than the texture layer 1, and the latent image-revealing layer 2 includes a first portion in contact with the texture layer 1, and a second portion in contact with the surface of the substrate 3.

[0076] The texture layer 1 is provided with an array of blank areas 13, the size of the blank areas 13 increases or decreases with the change of the gradation of the entire texture layer 1, the texture layer 1 includes a modulated texture portion 11 and a non-modulated texture portion 12, the modulated texture portion 11 is not larger than the non-modulated texture portion 12, and the modulated texture portion 11 is complementary to the non-modulated texture portion 12, the texture layer 1 is printed with a primer, the thickness of the texture layer 1 is 2-4 microns, and the equipment used is at least a 5+1 color offset printing press, and the "1" in the "5+1 color offset printing press" refers to an anilox roller oiling unit. In some embodiments, the modulated texture portion 11 is not larger than the non-modulated texture portion 12.

[0077] The latent image display layer 2 is composed of an array of protrusions 21 , and the array of the protrusions 21 is consistent with the array of the blank areas 13 provided in the texture layer 1 , and the protrusions 21 are tiny protrusions. The latent image display layer 1 is formed by printing and condensing the surface oil. The equipment used is the aforementioned offset printing machine with an anilox roller oiling unit. The mesh number of the anilox roller is 50-300 meshes. In this embodiment, a 100-mesh anilox roller is used. The surface oil and the base oil used are mutually exclusive. After the surface oil is transferred to the surface of the packaging substrate 3 by the anilox roller, it repels the printed and dried texture layer 1 and quickly condenses to the area without printed base oil, that is, it condenses into tiny protrusions 21 in the blank area of ​​the texture layer 1, and the condensed tiny protrusions 21 are quickly cured and formed by a UV light source. The array of tiny protrusions 21 formed after curing is equivalent to the dots of the printed halftone image. The size change of the bottom figure of the tiny protrusions 21 is similar to the law that the dots of the amplitude modulation screening change with the gradation, and the size change of the bottom figure of the tiny protrusions 21 affects the change in the shrinkage of the surface oil, so that the height of the tiny protrusions 21 also has corresponding height changes.

[0078] The preparation of the texture layer 1 in this embodiment provides a method for preparing a multi-directional latent image texture, which is used to prepare the texture layer 1 printed by a primer, and includes the following steps:

[0079] S1' makes tile pattern 4: using a semi-regular mosaic mode, regular triangles, regular quadrilaterals and regular hexagons with the same side length are arranged around a vertex to form a seamless tile pattern 4; the semi-regular mosaic mode used in this embodiment is specifically a 4-3-4-6 mosaic mode, that is, squares, regular triangles, squares and regular hexagons are arranged in sequence around each vertex, so that the sum of the angles at the vertex is 360° (90°+60°+120°+60°=360°), so seamless splicing can be repeated to form a regular plane mosaic. The side lengths of the regular triangles, regular quadrilaterals and regular hexagons used are all a millimeters, where a∈[0.08,0.25], preferably a∈[0.1,0.15], and a=0.127 millimeters in this embodiment.

[0080] S2′ obtains the minimum tiling unit 5: a minimum tiling unit 5 that can be tiled and restored to the original seamless tiling pattern is cut out from the seamless tiling pattern 4 formed in step S1′. The minimum tiling unit in this embodiment is a rectangle;

[0081] S3' produces the minimum tiling element 6: based on the size of the minimum tiling unit 5 formed in step S2', an element with the same size as the minimum tiling unit 5 is set, and the center point of the halftone dot 61 is set on the element corresponding to the intersection point in the minimum tiling unit 5 and the center point of the regular hexagon, and a tone height line with amplitude modulation variation of the dot 61 extending outward based on the center point is set, and the minimum threshold matrix for halftoning of the image is constructed thereby, and the shape of the dot 61 is not limited.

[0082] The shape of the dots 61 is not limited because the dot shape can be a closed shape such as a circle, an ellipse or a polygon. The choice of the dot shape does not affect the establishment of the minimum threshold matrix, but only affects the distribution position of each data in the minimum threshold matrix. In this embodiment, circular dots are used.

[0083] S4' tiling: the minimum threshold matrix formed in step S3' is tiled according to the size of the image to be halftoned to obtain the threshold matrix of the entire image, and finally the entire control image is halftoned to form the texture pattern 7 with gradation changes required in this embodiment.

[0084] S5' information modulation: based on the texture pattern 7 formed in the S4' step, with text, graphics, and images as the limiting units 8, multiple information modulation is performed from multiple modulation angles in the same area, a texture pattern of the modulated texture part 11 is formed in the limiting unit 8, and a texture pattern of the non-modulated texture part 12 is formed outside the limiting unit 8. The limiting units 8 used in this embodiment are letters A, B, C, and D, and are respectively at different modulation angles. The modulation angles are five angles of 0°, 30°, 150°, 240°, and 300° in a clockwise or counterclockwise direction. In order to achieve multiple information hiding during information modulation, at least two of the angles will be selected for modulation, and one layer of information is hidden under each modulation angle. In this embodiment, four modulation angles of A-30°, B-150°, C-240°, and D-300° are selected.

[0085] S6' stitching: Based on the texture pattern 7 modulated in step S5', set a solid color block of equal size according to its size, set the texture pattern in step S5' to white, and place the white texture pattern on the solid color block to overlap and stitch together to form a multi-directional latent image texture required for the later production stage. A texture file can be formed based on the multi-directional latent image texture.

[0086] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes may be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined by the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A medium with a multi-directional latent image, the medium being arranged on the surface of a substrate, the medium comprising a texture layer and a latent image display layer, characterized in that: The texture layer is coated on the surface of the substrate, and the latent image developing layer includes a first portion in contact with the texture layer and a second portion in contact with the surface of the substrate, wherein: The texture layer is provided with an array of blank areas, the texture layer includes a modulated texture portion and a non-modulated texture portion, the modulated texture portion is complementary to the non-modulated texture portion; The latent image display layer is composed of an array of protrusions, and the array of the protrusions is consistent with the array of the blank areas set in the texture layer; The latent image development layer has a height greater than that of the texture layer.

2. The medium having a multi-directional latent image according to claim 1, characterized in that: The medium with the multi-directional latent image also has a tone change, and the tone change is controlled by the tone change of the selected image.

3. The medium having a multi-directional latent image according to claim 1, characterized in that: The texture layer is formed by printing with base oil, and the latent image display layer is formed by printing and condensing with surface oil.

4. The medium having a multi-directional latent image according to claim 1, characterized in that: The protrusions of the array include protrusions having different shapes, sizes and heights.

5. A method for producing a multi-directional latent image texture, wherein the multi-directional latent image texture is used to produce a texture layer of a medium having a multi-directional latent image, wherein the texture layer is printed with a primer, and wherein: The following steps are involved: S1 makes tiled patterns: using the semi-regular tessellation mode, regular triangles, regular quadrilaterals and regular hexagons with the same side length are arranged around a vertex to form a seamless tiled pattern; S2 obtains the minimum tiling unit: a minimum tiling unit that can be tiled and restored to the original seamless tiling pattern is cut out from the seamless tiling pattern formed in step S1; S3: making a minimum tile element: based on the size of the minimum tile unit formed in step S2, setting a component with the same size as the minimum tile unit, setting dots on the component corresponding to the intersection point in the minimum tile unit and the center point of the regular hexagon, and the shape of the dots is not limited, so as to form a minimum tile element; S4 tiling: tiling and cutting out a texture pattern of a required size using the minimum tiling element formed in step S3; S5 information modulation: based on the texture pattern formed in step S4, with text, graphics, and images as restriction units, multiple information modulation is performed from multiple modulation angles in the same area, forming a texture pattern of a modulated texture part within the restriction unit, and a texture pattern of a non-modulated texture part outside the restriction unit; S6 stitching: Based on the texture pattern modulated in step S5, set a solid color block of the same size according to its size, set the texture pattern in step S5 to white, and place the white texture pattern on the solid color block to overlap and stitch together to form a multi-directional latent image texture required for the later production stage.

6. The method for producing a multi-directional latent image texture according to claim 5, characterized in that: The semi-regular tessellation pattern used in step S1 is specifically a 4-3-4-6 tessellation pattern.

7. The method for producing a multi-directional latent image texture according to claim 5, characterized in that: The modulation angles in step S5 are five angles of 0°, 30°, 150°, 240° and 300° in the clockwise or counterclockwise direction. At least two of the angles are selected for modulation during information modulation, and one layer of information is hidden under each modulation angle.

8. A method for producing a multi-directional latent image texture, wherein the multi-directional latent image texture is used to produce a texture layer of a medium having a multi-directional latent image, wherein the texture layer is printed with a primer, characterized in that: The following steps are involved: S1' makes a tile pattern: using a semi-regular tessellation mode, regular triangles, regular quadrilaterals and regular hexagons with the same side length are arranged around a vertex to form a seamless tile pattern; S2' obtains the minimum tiling unit: cuts out a minimum tiling unit that can be tiled back to the original seamless tiling pattern from the seamless tiling pattern formed in step S1'; S3' prepares the minimum tile element: based on the size of the minimum tile unit formed in step S2', sets an element with the same size as the minimum tile unit, sets the center point of the halftone dot on the element corresponding to the intersection point in the minimum tile unit and the center point of the regular hexagon, and sets a gradient ascending line of the dot amplitude modulation change extending outward based on the center point, and constructs the minimum threshold matrix of the image halftoning by this, and the dot shape is not limited; S4' tiling: tiling the minimum threshold matrix formed in step S3' according to the size of the image to be halftoned to obtain the threshold matrix of the entire image, and halftoning the entire control image to form a texture pattern with tone changes; S5' information modulation: based on the texture pattern formed in step S4', with text, graphics, and images as limiting units, multiple information modulation is performed from multiple modulation angles in the same area, forming a texture pattern of a modulated texture part within the limiting unit, and a texture pattern of a non-modulated texture part outside the limiting unit; S6' stitching: Based on the texture pattern modulated in step S5', set a solid color block of the same size according to its size, set the texture pattern in step S5' to white, and place the white texture pattern on the solid color block to overlap and stitch together to form a multi-directional latent image texture required for the later production stage.

9. A process for finishing and forming a medium with a multi-directional latent image on a packaging surface, characterized in that: The following steps are involved: S10: preparing a file: preparing a multi-directional latent image texture by using the method for preparing a multi-directional latent image texture according to any one of claims 5 to 8, and forming a texture file based on the multi-directional latent image texture; S20 texture printing: printing the required decorative pattern on the packaging substrate, and printing with a primer according to the texture file formed in step S10, and drying to form a texture layer of the medium with a multi-directional latent image; S30 coating and polycondensation: on the packaging substrate in step S20, a surface oil is coated on the surface of the packaging substrate using an anilox roller, and polycondensation and drying are performed to form a latent image display layer of the multi-directional latent image medium; S40 packaging molding.

10. The process for finishing and forming a medium with a multi-directional latent image on a packaging surface according to claim 9, characterized in that: The top coat used in step S30 and the base coat used in step S20 are mutually exclusive, and the top coat is condensed into protrusions under the repulsive effect of the base coat.

Images