A hot stamping method and product having tactile and optical security features
Patent Information
- Application Number
- CN202611179545.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-08-05
- Publication Date
- 2026-10-27
Smart Images
Figure CN122976211A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of printing anti-counterfeiting and packaging decoration technology, specifically to a hot stamping method and product with tactile and optical anti-counterfeiting features. Background Technology
[0002] In high-end packaging, luxury goods, tobacco and alcohol, and cosmetics, product anti-counterfeiting and packaging quality are important reflections of brand value. Currently common anti-counterfeiting technologies include holographic hot stamping, laser engraving, microtext, and special inks. These technologies mostly focus on visual anti-counterfeiting and lack tactile verification methods. Furthermore, conventional tactile effects (such as embossing and UV relief) typically lack an integrated design combining visual anti-counterfeiting features and are easily counterfeited.
[0003] Existing hot stamping processes are mainly used to achieve visual effects such as metallic luster and color transfer, while foam printing is often used to create a three-dimensional embossed tactile feel. These are typically independent processes implemented separately, resulting in complex and costly procedures. Furthermore, they make it difficult to organically combine tactile structure with optical anti-counterfeiting at the microscopic level, thus limiting their anti-counterfeiting effectiveness.
[0004] Therefore, the market urgently needs a high-end anti-counterfeiting technology that can highly integrate tactile recognition and visual anti-counterfeiting, with a simple process and is difficult to imitate. Summary of the Invention
[0005] A first aspect of the present invention provides a method for forming a hot stamping stamp with tactile and optical anti-counterfeiting features, the method comprising the following steps:
[0006] An ink layer is formed on the surface of a printing substrate, wherein the ink layer contains thermally expandable foamed microspheres;
[0007] An electroplated aluminum foil is applied to the surface of the substrate using a hot stamping plate, such that the electroplated aluminum transfer layer is at least partially transferred and covers the ink layer; wherein, the heat and pressure applied during the hot stamping process induces a differentiated response in the foamed microspheres, forming a composite surface morphology in situ on the surface of the ink layer that simultaneously includes rough micro-regions and smooth protruding micro-regions, and the composite surface morphology causes the transfer layer covering it to produce structural discontinuities, thereby creating optical contrast in the hot stamping area;
[0008] After cooling and setting, a product with a tactile composite feel and a corresponding glossy-matte contrast visual effect is obtained.
[0009] In one embodiment, the differentiated response includes the rupture of some foamed microspheres and the non-rupture deformation of other foamed microspheres.
[0010] In one embodiment, the rough microregion is composed of ruptured foamed microspheres.
[0011] In one embodiment, the smooth, raised microregion is composed of foamed microspheres that undergo non-fracture deformation.
[0012] In one embodiment, the transfer layer is an aluminum-plated layer or a transparent dielectric layer.
[0013] In one embodiment, the foaming temperature of the foamed microspheres is 80℃-150℃.
[0014] In one embodiment, the ink layer is obtained by offset printing and drying.
[0015] In one embodiment, the material or surface shape of the hot stamping plate is specifically designed.
[0016] A second aspect of the present invention provides an anti-counterfeiting product obtained by any of the hot stamping methods described above, the product comprising:
[0017] Printing substrate;
[0018] An ink layer located on the substrate; wherein the surface of the ink layer has a composite surface morphology composed of micro-rough regions and micro-smooth protrusion regions;
[0019] A transfer layer, covering the ink layer, has a structural discontinuity corresponding to the composite surface morphology, the product surface having a tactile composite feel corresponding to the composite surface morphology, and an optical contrast formed by the structural discontinuity.
[0020] In one embodiment, the tactile sensation corresponding to the composite surface morphology is a composite tactile sensation, which includes a continuous pressure sensation from the microscopically smooth raised areas and an intermittent scratching sensation from the microscopically rough areas.
[0021] A third aspect of the present invention provides a packaging product whose surface is provided with an anti-counterfeiting product as described in any one of the second aspects of the present invention.
[0022] The beneficial effects of this invention are that by integrating foaming and hot stamping processes into one step to achieve integrated molding, it overcomes the problems of complex processes and low efficiency in the prior art. While significantly improving production efficiency, it also achieves dual anti-counterfeiting effects of touch and vision, solves the problems of traditional anti-counterfeiting technology being single, easy to imitate, and lacking tactile verification dimensions, and gives the product a high-end decorative texture, thus broadening its application in various packaging and labeling fields. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of the process flow of the method of the present invention. Detailed Implementation
[0024] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.
[0025] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is considered to be "connected" or "connected" to another element, it can be directly connected to the other element or there may be an intervening element. The terms "upper," "lower," "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.
[0026] The method for forming tactile and optical anti-counterfeiting features will be further explained in detail below with reference to the accompanying drawings and specific embodiments.
[0027] For an embodiment of a hot stamping method that creates tactile and optical anti-counterfeiting features, please refer to [link / reference]. Figure 1 The hot stamping method includes the following steps:
[0028] S10: An ink layer is provided on the surface of the substrate, wherein the ink layer contains thermally expandable foamed microspheres.
[0029] Specifically, this step aims to prepare a functional underlayer for subsequent lamination effects. The substrate can be any material that needs to be endowed with anti-counterfeiting and decorative properties, including but not limited to various types of paper (such as coated paper, white cardstock, and grey cardstock), plastic films (such as PET and PVC), or surface-treated metals and wood.
[0030] The selection and performance of the ink layer are crucial. To achieve good results, the ink layer must meet the following requirements: First, it should adhere firmly to the substrate surface; second, it should contain a sufficient amount of thermally expandable foamed microspheres evenly dispersed within it; and third, and most importantly, the ink layer must maintain a certain degree of flexibility or ductility when subjected to the high temperatures of subsequent hot stamping. This is because if the ink layer is too brittle and hard at high temperatures, when the internal foamed microspheres expand due to heat and generate enormous internal stress, the ink layer may be unable to deform effectively, leading to a significant weakening of its adhesion to the substrate, or even interlayer delamination, seriously affecting product quality and reliability.
[0031] Preferably, offset printing ink can be used and the ink layer can be formed after thorough drying. The ink layer formed by offset printing ink has good flexibility, adhesion and containment of microspheres at high temperatures, and can better adapt to the subsequent foaming and expansion process.
[0032] Alternatively, screen printing inks, letterpress printing inks, etc., can also be used under certain conditions, as long as they can meet the above performance requirements.
[0033] Thermally expandable foamed microspheres are the core functional material of this invention. Their outer shell is typically a thermoplastic polymer (such as acrylonitrile copolymer), while the interior encapsulates low-boiling-point liquid hydrocarbons. At room temperature, the microspheres are uniformly dispersed in the ink binder as fine particles (typically 5-50 micrometers in diameter), resulting in a smooth printed pattern.
[0034] Optionally, microsphere models with different particle sizes, shell thicknesses, mechanical strengths, and initial foaming temperatures (e.g., 80°C, 110°C, 150°C, 180°C) can be selected or microspheres can be compounded, depending on the final required tactile protrusion height, foaming rate, and matching hot stamping temperature.
[0035] Preferably, the initial foaming temperature of the thermally expandable foamed microspheres is 80℃-150℃.
[0036] After the ink layer is applied, it needs to be fully adhered to the substrate surface through appropriate processes (such as hot air drying, infrared drying, or UV curing). Crucially, during this drying / curing process, the process temperature must be kept below the initial foaming temperature of the selected foamed microspheres to ensure that the microspheres remain completely unactivated in their original state, strictly preserving the "foaming" reaction until it is triggered in the subsequent hot stamping process.
[0037] S20: Using a hot stamping plate, electroplated aluminum is hot stamped on the surface of the substrate, such that the transfer layer of electroplated aluminum is at least partially transferred and covers the ink layer.
[0038] Specifically, this step is the core processing stage for achieving simultaneous tactile and optical effects. Using conventional hot stamping equipment, the electroplated aluminum foil is placed above the substrate with the ink layer already applied. The stamping plate is heated and pressure is applied. When the stamping plate is pressed down, its heat is rapidly conducted through the carrier film of the electroplated aluminum foil to the ink layer below. During this process, two key effects occur simultaneously: first, the heat activates the hot melt adhesive layer on the back of the electroplated aluminum foil, and under pressure, it peels off the carrier film along with the transfer layer, transferring and firmly adhering to the surface of the substrate and ink layer; second, the heat transferred to the ink layer simultaneously activates the thermally expandable foamed microspheres contained within, triggering a response.
[0039] Alternatively, the transfer layer may be an aluminum-plated layer or a transparent dielectric layer.
[0040] The core mechanism of S20 is that the heat and pressure applied during the hot stamping process cause the foamed microspheres to respond differently, forming a composite surface morphology on the surface of the ink layer that includes both rough micro-regions and smooth protruding micro-regions.
[0041] Specifically, this process is the "casting" stage of the microstructure. When the hot stamping temperature reaches or exceeds the initial foaming temperature of the foamed microspheres, the liquid hydrocarbons encapsulated inside the microspheres rapidly vaporize, generating enormous internal pressure, causing the microsphere shell to expand. At the same time, the enormous downward pressure from the hot stamping plate inhibits and guides the expansion shape of the microspheres, exerting a strong "thermoplastic" effect on them. In this intense thermodynamic coupling field of "pressure from above and support from below," the microsphere group exhibits differentiated responses due to its own performance differences and uneven local stress.
[0042] Some microspheres with relatively thin outer shells or located in areas of high local pressure may rupture. The resulting fragments or collapsed structures often exhibit irregular shapes with several tiny, flexible "tentacles." Due to the elasticity and plasticity of the material itself, these flexible "tentacles" possess a certain degree of bending and resilience at the microscale, forming a microstructural region with dynamic undulation characteristics on the surface of the ink layer, namely, a rough micro-region.
[0043] The other group of microspheres, with higher shell strength or slightly less pressure, undergo non-fracture deformations such as stretching and thinning. After the pressure is removed, they partially rebound due to elastic recovery, forming a smooth, raised structure that is approximately spherical or ellipsoidal, i.e., smooth raised micro-regions. It is worth emphasizing that this "smoothness" is not a simple plane, but a microscopic continuous curved surface composed of the aforementioned spherical or near-spherical surfaces.
[0044] When a finger glides across the product surface, the smooth, raised micro-areas provide a continuous, smooth macroscopic guiding sensation and a rounded pressure feel; while the flexible 'tentacles' in the rough micro-areas undergo microscopic bending and elastic vibration under contact pressure, generating a series of high-frequency, gentle, and intermittent tactile stimuli. The superposition and coupling of these two different tactile signals—that is, the combination of the steady-state smooth guiding sensation and the dynamic elastic micro-vibration sensation—is fused and processed by the human tactile nerves to form the unique 'slip-vibration composite' tactile feel of this invention, which is difficult to simulate with a single material or rigid texture.
[0045] The two micro-regions, with their distinct physical forms and mechanical properties, were formed "in situ" and interlocked under hot pressing before the hot stamping plate was lifted, creating a unique composite surface morphology with multiple microscopic geometric features and tactile response mechanisms. This morphology not only serves as the physical source of tactile anti-counterfeiting but also provides the structural basis for the subsequent realization of visual anti-counterfeiting effects.
[0046] Optionally, by specifically designing the material or surface shape of the heat transfer plate, the distribution of rough and smooth raised micro-regions can be guided and controlled to a certain extent. For example, setting micro-raised or recessed textures on the surface of the heat transfer plate can create local pressure gradients in corresponding areas, thereby promoting or inhibiting the rupture behavior of microspheres and achieving a regionalized layout of different tactile characteristics. In addition, by selecting heat transfer plate materials with differentiated thermal conductivity, local heat transfer can also be adjusted, affecting the response intensity and morphology generation density of the foamed microspheres. This active control method can achieve tactile-optical integrated design of macroscopic patterns and functional areas while maintaining microscopic randomness.
[0047] Optionally, by precisely controlling the hot stamping temperature, pressure, time, and performance parameters of the foamed microspheres, the ratio, size, and distribution of rough micro-areas and smooth raised micro-areas can be further adjusted, thereby obtaining different tactile tendencies from "mainly with a delicate raised feel" to "mainly with a gravelly rough feel".
[0048] A further effect of S20 is that the composite surface morphology causes structural discontinuities in the transfer layer covering it, thereby creating optical contrast in the hot stamping area.
[0049] Specifically, this is a crucial step in transforming microscopic tactile morphology into macroscopic visual anti-counterfeiting. During hot stamping, the thermal expansion of foamed microspheres, the formation of composite morphology on the ink layer surface, and the transfer of the electroplated aluminum transfer layer are synchronous and coupled physical processes. When heat and pressure are applied to the electroplated aluminum, the transfer layer peels off from the carrier film and covers the surface of the substrate. At the same time, the foamed microspheres in the ink layer undergo differentiated responses under the same heat and pressure, forming composite surface morphology in situ. Therefore, the transfer layer is not completely transferred first and then destroyed by the underlying morphology, but rather, it is directly affected by the microstructure forming below during the transfer process: the irregular contours of the rough micro-regions below can easily pierce or tear the extremely thin transfer layer (usually only tens of nanometers) covering them during the transfer process; while the rounded tops of the smooth, raised micro-regions may lift the transfer layer and stretch and thin it, but not necessarily completely break it.
[0050] In particular, when the transfer layer of the electroplated aluminum is a transparent dielectric layer (such as transparent electroplated aluminum or a specific optical coating), the localized thinning effect with a specific gradient caused by smooth, raised micro-regions will result in a precise thickness distribution of the dielectric layer in that region after transfer and shaping. Under the influence of the thin-film interference principle, this thickness distribution will produce an iridescent effect (i.e., structural color) that varies with the angle under white light illumination, forming a unique rainbow-like visual effect.
[0051] Such microscopic changes in the physical state of the transfer layer caused by local abrupt changes in the substrate morphology are collectively referred to as structural discontinuities. The direct consequence is an alteration in the optical properties of the transfer layer: regions that remain intact or are only uniformly stretched retain a smooth, mirror-like surface, exhibiting specular reflection and a glossy effect; while torn, porous, or severely unevenly stretched and thinned regions become rough, exhibiting diffuse reflection and a matte effect. Therefore, the pattern of the underlying composite morphology is "replicated" as the optical contrast pattern of the upper transfer layer, with the two corresponding precisely in space.
[0052] In summary, structural discontinuities can manifest not only as a contrast between glossy and matte surfaces, but also, under specific material systems, as a contrast between iridescent and matte areas, or a combination of multiple optical effects, thus providing richer and more difficult-to-imitate anti-counterfeiting features.
[0053] S30: After cooling and shaping, a product with a tactile composite feel and corresponding glossy-matte contrast visual effect is obtained.
[0054] Specifically, after the hot stamping process ends and the hot pressing is completed, the workpiece begins to cool naturally. The resin binder in the ink layer solidifies and sets, permanently fixing the composite surface morphology formed by the foamed microspheres during the hot stamping process. The ruptured microspheres, due to structural damage, cannot recover; their shell fragments and collapsed forms are firmly embedded in the ink matrix. The flexible "tentacle" structure formed by the rupture is also solidified and retained, still possessing micron-level elasticity, forming a composite rough structure on the surface that combines microscopic depressions, protrusions, and slight deformation. Meanwhile, the microspheres that undergo non-rupture deformation, under the combined effects of thermo-elastic-plastic forces, retain the bulging morphology formed by stretching and volume increase, while also exhibiting a smooth, near-spherical or quasi-spherical curved surface structure due to the elastic recovery of the material. Thus, the product surface forms a permanent microscopic three-dimensional morphology composed of a solidified but slightly elastic "tentacle" rupture structure and smooth bulges that combine deformation and resilience.
[0055] When touched, one can simultaneously feel the continuous, smooth guiding sensation and rounded pressure provided by the smooth, raised micro-areas, as well as the elastic bending and micro-vibration sensation generated by the flexible 'tentacle' structure in the rough micro-areas under pressure. Unlike the simple scraping sensation produced by a completely rigid structure, the flexible 'tentacle' provides a high-frequency, gentle, and dynamically attenuating intermittent tactile feedback, a unique 'micro-vibration sensation' caused by the vibration of the micro-elastic structure, rather than rigid friction. These two tactile signals, which differ significantly in physical form, elastic modulus, and dynamic response—namely, the steady-state smooth guiding sensation and the dynamic elastic micro-vibration sensation—are fused and processed by the human tactile nerves to form the unique, richly layered, and difficult-to-imitate "slip-vibration composite" tactile sensation of this invention. This sensation is not a simple superposition, but rather originates from the systematic synergy of micro-geometry, material elasticity, and dynamic mechanical properties.
[0056] Simultaneously, the optical contrast pattern of the transfer layer is permanently presented along with the fixed morphology. Since the formation of this pattern is based on the random rupture and non-uniform deformation of the foamed microspheres during hot pressing, the transfer layer exhibits a more complex stress state in the corresponding areas of the ruptured microspheres—especially in the localized areas where the flexible "tentacles" are distributed—due to the irregular and elastic support structure. This easily leads to the formation of microscopic "breakpoint" blanks, extremely thin areas, or fine wrinkles. These "breakpoints" visually appear as localized voids, matte spots, or scattering textures without metal or dielectric layer coverage, forming a stark contrast with the surrounding fully covered highlight areas. This "breakpoint-integrity" distribution corresponds strictly in space to the aforementioned "slip-tremor composite" tactile morphology. Furthermore, because its formation process is influenced by the randomness of microsphere rupture and the elastic deformation of the "tentacles," the pattern edges and distribution details possess a highly unpredictable and non-reproducible natural randomness, resulting in significant anti-counterfeiting features.
[0057] Preferably, in some cases, tiny fragments of the torn transfer layer may remain and adhere to the rough micro-area surface—especially wrapped around or attached to the flexible “tentacles.” When illuminated by light, these fragments can produce a dynamic flashing and light-and-shadow flow effect depending on the viewing angle and the micro-movement of the “tentacles,” further enhancing the complexity and aesthetic appeal of visual anti-counterfeiting.
[0058] Based on the above method, the present invention also provides corresponding product implementation methods:
[0059] An anti-counterfeiting product according to one embodiment, obtained by any of the hot stamping methods described above, includes:
[0060] Printing substrate;
[0061] An ink layer located on the substrate; wherein the surface of the ink layer has a composite surface morphology composed of micro-rough regions and micro-smooth protrusion regions;
[0062] A transfer layer, covering the ink layer, has a structural discontinuity corresponding to the morphology of the composite surface;
[0063] Furthermore, the product surface has a tactile composite feel corresponding to the composite surface morphology, as well as an optical contrast formed by the structural discontinuities.
[0064] One embodiment of the packaging product has an anti-counterfeiting product provided on its surface as described above.
[0065] The following specific embodiments further illustrate the implementation process and technical effects of the present invention.
[0066] The following are specific examples.
[0067] Example 1
[0068] Step S10: An ink layer is applied to the surface of 300g / m² white cardboard using a conventional offset printing process. The ink layer contains thermally expanding foamed microspheres with an initial foaming temperature of 90℃. After printing, the ink layer is dried and cured to form a smooth printing layer.
[0069] Step S20: Select ordinary silver electroplated aluminum foil and perform electroplated aluminum hot stamping on the surface of the substrate; set the hot stamping temperature to 120℃, adjust the pressure to 100kg / cm², and hold the pressure for 1.0 second to ensure that the electroplated aluminum transfer layer is completely transferred and covers the ink layer. During the hot stamping process, heat and pressure induce differentiated responses in the foamed microspheres.
[0070] Step S30: After natural cooling, the final product is obtained. In terms of tactile sensation, when a finger runs across the hot-stamped area, one can simultaneously perceive: the continuous, rounded guiding feel of the smooth, raised areas formed by the unbroken microspheres, and the subtle elastic vibration (micro-vibration) and intermittent tactile stimulation of the rough micro-areas formed by the broken microspheres. These two sensations combine to create a complex tactile experience with layers and dynamic variations. Visually, the hot-stamped area exhibits an overall silvery-white luster, and the transfer layer forms irregular gaps or breaks in the areas corresponding to the broken microspheres due to structural damage. Because the fragments and irregular "tentacles" formed by the broken microspheres disrupt the continuity of the original transfer layer, the hot-stamped surface displays randomly distributed microscopic "breakpoint"-like blank micro-areas, directly exposing the underlying ink or substrate color. These "breakpoints," together with the surrounding bright silvery-white areas, constitute a discontinuous, unreplicable, high-contrast optical pattern, further enhancing anti-counterfeiting identification and visual complexity.
[0071] Example 2
[0072] Step S10: An ink layer is applied to the surface of 350g / m² white cardboard using gravure printing. The ink layer contains thermally expandable foamed microspheres with an initial foaming temperature of 100℃. After printing, the paper is dried.
[0073] Step S20: Select holographic diffraction electroplated aluminum foil and perform electroplated aluminum hot stamping on the surface of the substrate; set the hot stamping temperature to 150℃, adjust the pressure to 100kg / cm², and hold the pressure for 1.0 second to ensure that the transfer layer of electroplated aluminum completely covers the ink layer.
[0074] Step S30: The product is obtained after cooling. Under normal lighting, the product visually blends with the surrounding holographic pattern. However, upon closer inspection, microscopic "breakpoints" caused by microsphere breakage can be seen in the hot-stamped area, their random distribution disrupting the continuity of the holographic layer. Tactilely, the hot-stamped area has a three-dimensional raised surface, exhibiting a unique composite feel formed by the interweaving of smooth ridges and rough "tentacle" structures. When observed under specific lighting angles, the "breakpoint" areas appear as dark gaps due to the lack of a metal layer, creating a strong contrast with the surrounding highly diffractive holographic glossy areas. This optical feature corresponds to the tactile rough / smooth micro-areas, achieving triple anti-counterfeiting verification through touch, vision, and structural integrity.
[0075] Example 3
[0076] Step S10: An ink layer is set on the surface of a 200μm thick PET film by screen printing. The ink layer contains two types of thermally expandable foamed microspheres with initial foaming temperatures of 110℃ and 130℃. After printing, the ink is cured by UV.
[0077] Step S20: Select transparent dielectric layer electroplated aluminum foil (optical coating) and perform electroplated aluminum hot stamping on the surface of the substrate; set the hot stamping temperature to 140℃, adjust the pressure to 80kg / cm², and hold the pressure for 0.8 seconds to ensure that the transparent transfer layer completely covers the ink layer.
[0078] Step S30: After cooling and setting, the product is obtained. In terms of tactile feel, the hot-stamped area exhibits a distinct three-dimensional undulation, with a smooth, elastic feel combined with a fine, slightly bouncy texture. The flexible 'tentacle' structure formed by the broken microspheres further enhances the dynamic recognizability of the touch. Visually, in the smooth, raised micro-areas, the transparent dielectric layer is stretched, creating a thickness gradient that produces an iridescent sheen at specific angles. In areas corresponding to the broken microspheres, the dielectric layer forms microscopic light-transmitting 'breakpoints' due to fracture or peeling. These breakpoints lack interference colors due to the absence of the dielectric layer, appearing as a base color or matte patches. Overall, the hot-stamped area creates a dynamic composite optical effect where "iridescence – breakpoints – matte" coexist. This effect corresponds precisely to the tactile distribution in space, achieving high-end decoration while forming multiple random, difficult-to-imitate layers of anti-counterfeiting information.
[0079] The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any adaptive modifications and substitutions to process parameters and material selection made by those skilled in the art, based on an understanding of the core concept of the present invention, should be included within the scope of protection of the appended claims.
Claims
1. A method for forming a hot stamping stamp with tactile and optical anti-counterfeiting features, characterized in that, Includes the following steps: An ink layer is formed on the surface of a printing substrate, wherein the ink layer contains thermally expandable foamed microspheres; An electroplated aluminum foil is applied to the surface of the substrate using a hot stamping plate, such that the electroplated aluminum transfer layer is at least partially transferred and covers the ink layer; wherein, the heat and pressure applied during the hot stamping process induces a differentiated response in the foamed microspheres, forming a composite surface morphology in situ on the surface of the ink layer that simultaneously includes rough micro-regions and smooth protruding micro-regions, and the composite surface morphology causes the transfer layer covering it to produce structural discontinuities, thereby creating optical contrast in the hot stamping area; After cooling and setting, a product with a tactile composite feel and a corresponding glossy-matte contrast visual effect is obtained.
2. The hot stamping method according to claim 1, characterized in that, The differentiated response includes the rupture of some foamed microspheres and the non-rupture deformation of other foamed microspheres.
3. The hot stamping method according to claim 2, characterized in that, The rough micro-regions are composed of ruptured foamed microspheres.
4. The hot stamping method according to claim 3, characterized in that, The smooth, raised micro-regions are composed of foamed microspheres that undergo non-rupture deformation.
5. The hot stamping method according to claim 1, characterized in that, The transfer layer is an aluminum-plated layer or a transparent dielectric layer.
6. The hot stamping method according to claim 1, characterized in that, The foaming temperature of the foamed microspheres is 80℃-150℃.
7. The hot stamping method according to claim 1, characterized in that, The ink layer is obtained by offset printing and drying.
8. The hot stamping method according to any one of claims 1-7, characterized in that, The material or surface shape of the hot stamping plate is specifically designed.
9. An anti-counterfeiting product manufactured by the hot stamping method according to any one of claims 1 to 8, characterized in that, include: Printing substrate; An ink layer located on the substrate; wherein the surface of the ink layer has a composite surface morphology composed of micro-rough regions and micro-smooth protrusion regions; A transfer layer, covering the ink layer, has a structural discontinuity corresponding to the composite surface morphology, the product surface having a tactile composite feel corresponding to the composite surface morphology, and an optical contrast formed by the structural discontinuity.
10. A packaged product, characterized in that, Its surface is provided with the anti-counterfeiting product as described in claim 9.