A colorful color-changing film

Abstract

The present invention discloses a multi-color-changing film, comprising a base film layer, a first film layer arranged on one side surface of the base film layer, an organic layer arranged on the first film layer on the side surface away from the base film layer, a second film layer arranged on the organic layer on the side surface away from the first film layer, and a color layer arranged on the second film layer on the side surface away from the organic layer, wherein the first film layer, the organic layer and the second film layer form a planar waveguide resonance structure. Through the above structure, the colors originally presented by the first film layer, the organic layer and the second transparent medium are changed, so that the multi-color-changing film has a richer and more complex color-changing effect; at the same time, the anti-counterfeiting effect of the multi-color-changing film is enhanced by superposition, which greatly improves the anti-counterfeiting property of the product.

Description

Technical Field

[0001] The invention relates to the technical field of color-changing films, and in particular to a multi-colored color-changing film. Background Art

[0002] The existing multi-color film is bright and colorful, but most of the current multi-color films are transparent, and the surface color is relatively light. In addition, the multi-color film mostly uses one technology to present the color change effect, which is difficult to imitate, greatly reducing the anti-counterfeiting effect of the product.

[0003] The preceding description is intended to provide general background information and does not necessarily constitute prior art. Summary of the invention

[0004] The object of the present invention is to provide a colorful color-changing film with high anti-counterfeiting degree, which has a strong color-changing effect when the observation angle changes.

[0005] The present invention provides a multi-color color-changing film, comprising a base film layer, a first film layer arranged on a surface of one side of the base film layer, an organic layer arranged on a surface of the first film layer away from the base film layer, a second film layer arranged on a surface of the organic layer away from the first film layer, and a color layer arranged on a surface of the second film layer away from the organic layer, wherein the first film layer, the organic layer and the second film layer form a planar waveguide resonance structure.

[0006] In one embodiment, the color layer has at least one color region.

[0007] In one embodiment, when the number of the color areas is one, the color area is a full-page single color; when the number of the color areas is multiple, different color areas are adjacent or spaced apart so that different color areas correspond to the patterns required by the product.

[0008] In one embodiment, when the number of the color areas is 1, the color of the color area is black, the multi-color-changing film appears green at an observation angle of 0°, gradually transitions as the observation angle increases, and appears pink-purple when the observation angle is 80°.

[0009] In one embodiment, the color layer has a thickness of 0.1 um to 20 um.

[0010] In one embodiment, the thickness of the first film layer and the second film layer are both smaller than the thickness of the organic layer.

[0011] In one embodiment, the base film layer is made of a polyester base film, the organic layer is made of a resin, the color layer is made of nano-scale ink, the first film layer is a transparent medium layer or a semi-transparent and semi-reflective film layer, and the second film layer is a transparent medium layer, wherein the transparent medium layer is made of titanium dioxide or zinc sulfide, and the semi-transparent and semi-reflective film layer is made of metallic chromium.

[0012] In one embodiment, the multi-color film further includes an information layer, the information layer is located between the first film layer and the base film layer or is directly disposed on the organic layer, and the information layer is provided with a micro-nano structure.

[0013] In one embodiment, a hot melt adhesive layer for bonding with the hot stamped object is fixedly laid on the color layer.

[0014] In one embodiment, a release layer is provided between the base film layer and the first film layer, and the release layer is peeled off the base film layer after the hot melt adhesive layer is combined with the hot stamping object.

[0015] The colorful color-changing film provided by the present invention changes the colors originally presented by the first film layer, the organic layer and the second transparent medium by means of a color layer arranged on the surface of the second film layer on the side away from the organic layer, so that the colorful color-changing film has a richer and more complex color-changing effect; at the same time, the anti-counterfeiting effect of the colorful color-changing film is enhanced by superposition, thereby greatly improving the anti-counterfeiting property of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic structural diagram of a multi-color-changing film according to a first embodiment of the present invention;

[0017] Figure 2 A reflection spectrum diagram of a planar waveguide resonant structure formed by the first transparent medium layer, the organic layer and the second film layer in the first embodiment of the present invention;

[0018] Figure 3 For Figure 2 Reflection spectrum after superimposing a black color layer at the same angle;

[0019] Figure 4 This is a schematic structural diagram of a multi-color-changing film according to a second embodiment of the present invention;

[0020] Figure 5 This is a schematic structural diagram of a multi-color-changing film according to a third embodiment of the present invention;

[0021] Figure 6 A schematic structural diagram of the multi-color-changing film of the third embodiment of the present invention from another viewing angle;

[0022] Figure 7 Schematic diagram of the structure of the multi-color-changing film according to the fourth embodiment of the present invention. DETAILED DESCRIPTION

[0023] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0024] Please refer to Figure 1 The multi-color film provided by the present invention comprises a base film layer 1, a first film layer 2 fixed on one side surface of the base film layer 1, an organic layer 3 arranged on the side surface of the first film layer 2 away from the base film layer 1, a second film layer 4 arranged on the side surface of the organic layer 3 away from the first film layer 2, and a color layer 5 arranged on the side surface of the second film layer 4 away from the organic layer 3. The first film layer 2, the organic layer 3 and the second film layer 4 form a planar waveguide resonance structure.

[0025] The base film layer 1 is a polyester base film with a thickness of 12-100 μm.

[0026] The structure formed by the first film layer 2, the organic layer 3, and the second film layer 4 is a planar waveguide resonance structure formed based on the planar waveguide resonance principle. When the viewing angle is changed, the resonance frequency will move, so that the multi-color film has a color-changing effect, thereby realizing the expression of color. That is, when the incident wavelength changes at different viewing angles, standing wave resonance occurs, realizing the color change, and achieving the effect that the color changes with the change of the viewing angle.

[0027] Specifically, the first film layer 2 is a transparent medium layer or a semi-transparent and semi-reflective film layer, and the second film layer 4 is a transparent medium layer. When the first film layer 2 and the second film layer 4 are both transparent medium layers, the material of the transparent medium layer is preferably titanium dioxide or zinc sulfide, and a vacuum evaporation process is used; the thickness of both is 10nm to 1um. When the first film layer 2 is a semi-transparent and semi-reflective film layer, the material of the semi-transparent and semi-reflective film layer is preferably metal chromium, which is formed by vacuum sputtering; the thickness of both is 10nm to 1um. The material of the organic layer 3 is a resin, and the material contains a diluent; the organic layer 3 is made by a nano-coating process, and the thickness of the organic layer 3 is 10nm to 10um.

[0028] In fact, different materials and / or different thicknesses of the first film layer 2, the organic layer 3, and the second film layer 4 can achieve different colors. As the thickness increases, the wavelength of the resonance becomes longer, and as the observation angle (incident angle) changes, the color presented changes.

[0029] The color of the color layer 5 is dark, such as black, dark purple, dark blue, etc. The thickness of the color layer 5 is 0.1um to 20um, preferably 1um to 10um. The material of the color layer is nano-level ink.

[0030] By superimposing the color layer 5 to absorb colors of different wavelengths to change the wavelength of the final reflected light, the color presented by the original planar waveguide resonance structure is changed, achieving a stronger (i.e., darker) color change effect, thereby enhancing the visual sense and further enhancing the anti-counterfeiting effect; at the same time, it also makes the product finally present a complex color change effect after superposition, and the double superposition increases the difficulty of imitation, greatly improving the anti-counterfeiting of the product.

[0031] The multi-color film further includes an information layer 8, which is located between the first film layer 2 and the base film layer 1 or directly disposed on the organic layer 3; a micro-nano structure 81 is disposed on one side of the surface of the information layer 8. It should be noted that when the surface of the information layer 8 having the micro-nano structure 81 contacts the first film layer 2 or the second film layer 4, if the thickness of the first film layer 2 or the second film layer 4 is nanometer-level, the surfaces on both sides of the first film layer 2 or the second film layer 4 follow the surface of the information layer 8 having the micro-nano structure 81; if the thickness of the first film layer 2 or the second film layer 4 is micrometer-level, the surface of one side of the first film layer 2 or the second film layer 4 follows the surface of the information layer 8 having the micro-nano structure 81, and the surface of the other side is flat.

[0032] Specifically, the cross-sectional shape of the micro-nano structure 81 is an arc, a triangle, a square, a rectangle, a trapezoid or an irregular shape, or a combination of two or more arbitrary shapes.

[0033] Due to the micro-nano structure 81 on the information layer 8, the colorful color-changing film presents a dynamic laser effect. At the same time, the cross-sectional shapes of the micro-nano structure 8 are different, and the light and shadow effects of the colorful color-changing film are also different, such as dynamic light and shadow with opposite motion effect, and dynamic light and shadow with sand dot effect.

[0034] The color changing effect of the multi-color color changing film of the present invention will be described in detail below in conjunction with specific embodiments.

[0035] First embodiment

[0036] like Figure 1 As shown, the multi-color film provided in this embodiment includes, from top to bottom, a base film layer 1, an information layer 8, a first film layer 2, an organic layer 3, a second film layer 4 and a color layer 5. The surface of the information layer 8 having the micro-nano structure 81 contacts the first film layer 2.

[0037] The base film layer 1 is made of a biaxially oriented polyester film with a thickness of 25um; the material of the first film layer is zinc sulfide, which is produced by vacuum evaporation and has a thickness of 100nm; the material of the organic layer 3 is PMMA (Polymethyl methacrylate) resin, which is produced by nano-coating process and has a thickness of 100nm; the material of the second film layer 4 is zinc sulfide, which is produced by vacuum evaporation and has a thickness of 100nm; the number of color layers is 1, the color of the color layer is black, which is produced by nano-coating process and has a thickness of 2um.

[0038] Since the structure formed by the first film layer, the organic layer 3, and the second film layer 4 is based on the principle of planar waveguide resonance, the color expression is achieved by designing the materials of each layer and matching different thicknesses. As the thickness increases, the wavelength of the resonance becomes longer, and as the observation angle (incident angle) changes, the color presented changes.

[0039] Therefore, in this embodiment, when the materials and thicknesses of the first film layer, the organic layer 3 and the second film layer 4 are selected, the color changes at different observation angles are as follows.

[0040] like Figure 2 As shown in the figure, wavelength represents wavelength and reflection represents reflection efficiency. It can be seen that there are two peaks at around 425nm (purple) and 550nm (green), and the peak intensities are similar. The final color of the product is the result of the superposition of the two peaks, that is, pink-purple.

[0041] Based on the black color layer 5 set in this way, that is, the planar waveguide resonance structure formed by the first film layer, the organic layer 3, and the second film layer 4 changes the wavelength of the final reflected light after being superimposed on the black color layer 5. Figure 3 As shown in the figure, wavelength represents wavelength and reflection represents reflection efficiency. It can be seen that there are two peaks at around 425nm (purple) and 550nm (green). Figure 2 Due to the absorption of the black layer, the peak intensities at both locations are weakened, and the reduction is obvious at around 425nm (purple), so that the main peak appears at around 550nm (green), and the product finally appears green. The multi-color film appears green at an observation angle of 0°, and gradually transitions as the observation angle increases. When the observation angle is 80°, it appears pink-purple, that is, the multi-color film of this embodiment finally presents a color change effect from green to purple. Compared with the color-changing film without a color layer, the final color of the product of this embodiment is the effect of multi-layer superposition, which greatly increases the difficulty of imitation and has extremely high anti-counterfeiting properties.

[0042] Second embodiment

[0043] like Figure 4 As shown, the difference between the colorful color-changing film provided in this embodiment and the above-mentioned first embodiment is that, in this embodiment, the color layer 5 includes three color areas, wherein the color layer 5 includes a first color area 51, a second color area 52 and a third color area 53, and the colors are different in different color areas.

[0044] In this embodiment, the color areas are hollowed out and distributed according to the product pattern design, the first color area 51 is black, the second color area 52 is dark purple, the third color area 53 is dark blue, and the distribution of the color areas corresponds to the desired pattern.

[0045] like Figure 5 As shown, the hollowed-out portion of the color layer 5 can also achieve the effect of color change with the change of the observation angle due to the planar waveguide resonance structure composed of the first film layer, the organic layer 3, and the second film layer 4, but there is no superposition effect of the color layer, and the color change effect is relatively weak. The portion with color area distribution is superimposed with the planar waveguide resonance structure composed of the first film layer, the organic layer 3, and the second film layer 4, showing a significant color change effect. The combination of the two can not only achieve a richer color graphic design in accordance with the pattern required by the product, but also increase the anti-counterfeiting strength of the product.

[0046] Third embodiment

[0047] like Figure 6 As shown, the difference between the multi-color-changing film provided in this embodiment and the first embodiment is that, in this embodiment, the multi-color-changing film is provided with a release layer 6 and a hot-melt adhesive layer 7 .

[0048] Specifically, the release layer 6 is fixedly laid on the lower surface of the base film layer 1; the information layer 8 is arranged on the lower surface of the release layer 6, and the surface of the information layer having the micro-nano structure 81 is in contact with the first film layer 2; the hot melt adhesive layer 7 is fixedly laid on the lower surface of the color layer 5.

[0049] The release layer 6 is used to facilitate the peeling of the base film 1 after hot stamping. Therefore, after peeling the base film 1, the release layer 6 can be the outermost layer of the entire multi-color-changing film, and has the function of protecting the first medium layer 2; of course, according to needs, when peeling the base film 1, the release layer 6 can also be peeled together. The hot melt adhesive layer 7 is used to combine with the hot stamped object to make the multi-color-changing film become a multi-color-changing hot stamping film. This hot stamping multi-color-changing film can be widely used in various hot stamping occasions, with simple operation and high color change anti-counterfeiting efficiency.

[0050] Fourth embodiment

[0051] like Figure 7As shown, the difference between the multi-color film provided in this embodiment and the third embodiment is that in this embodiment, the color layer 5 includes three color areas, including a first color area 51, a second color area 52 and a third color area 53, and the colors in different color areas are different. This embodiment provides a multi-color hot stamping film with rich colors, strong design, high anti-counterfeiting degree, and can be conveniently used in the hot stamping field.

[0052] In the accompanying drawings, the sizes and relative sizes of layers and regions are exaggerated for clarity. It should be understood that when an element, such as a layer, region, or substrate, is referred to as being "formed on," "disposed on," or "located on" another element, the element may be disposed directly on the other element, or there may be intervening elements. Conversely, when an element is referred to as being "formed directly on" or "disposed directly on" another element, there are no intervening elements.

[0053] In this document, the directions or positional relationships indicated by terms such as "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside", "vertical", and "horizontal" are based on the directions or positional relationships shown in the accompanying drawings and are only for the clarity of expressing the technical solutions and the convenience of description, and therefore should not be understood as limitations of the present invention.

[0054] In this document, the ordinal adjectives “first”, “second”, etc. used to describe elements are only used to distinguish elements with similar attributes, and do not mean that the elements described in this way must follow a given order, or time, space, level or other limitations.

[0055] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0056] In this document, the terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of elements other than those listed and may also include additional elements not expressly listed.

[0057] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A multi-color film, characterized in that: The invention comprises a base film layer, a first film layer arranged on one surface of the base film layer, an organic layer arranged on the first film layer on a surface away from the base film layer, a second film layer arranged on the organic layer on a surface away from the first film layer, and a color layer arranged on the second film layer on a surface away from the organic layer, wherein the first film layer, the organic layer and the second film layer form a planar waveguide resonance structure, the color layer is provided with at least one color region, when the number of the color regions is one, the color region is full-page monochrome; when the number of the color regions is multiple, different color regions are adjacent or spaced so that different color regions correspond to the patterns required by the product, and the thickness of the color layer is 0.1um~20um.

2. The multi-color film according to claim 1, characterized in that: When the number of the color regions is 1, the color of the color region is black, the multi-color-changing film appears green at an observation angle of 0°, gradually transitions as the observation angle increases, and appears pink-purple when the observation angle is 80°.

3. The multi-color film according to claim 1, characterized in that: The thickness of the first film layer and the second film layer are both smaller than the thickness of the organic layer.

4. The multi-color film according to claim 1, characterized in that: The material of the base film layer is a polyester base film, the material of the organic layer is a resin, the material of the color layer is a nano-scale ink, the first film layer is a transparent medium layer or a semi-transparent and semi-reflective film layer, and the second film layer is a transparent medium layer, wherein the material of the transparent medium layer is titanium dioxide or zinc sulfide, and the material of the semi-transparent and semi-reflective film layer is metallic chromium.

5. The multi-color film according to claim 1, characterized in that: The multi-color film further comprises an information layer, the information layer is located between the first film layer and the base film layer or is directly arranged on the organic layer, and the information layer is provided with a micro-nano structure.

6. The multi-color film according to claim 1, characterized in that: A hot melt adhesive layer for combining with the hot stamped object is fixedly laid on the color layer.

7. The multi-color film according to claim 6, characterized in that: A release layer is provided between the base film layer and the first film layer, and the release layer is used to peel off the base film layer after the hot melt adhesive layer is combined with the hot stamping object.

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