A method for preparing a positioning hot stamping type liquid crystal ghost imaging anti-counterfeiting label

Abstract

The present application relates to a kind of preparation methods of positioning hot stamping type liquid crystal phantom imaging anti-fake label, belong to anti-fake label preparation technical field.The method includes: the predetermined hot stamping area of label substrate is carried out surface activation treatment, constructs hot stamping bonding receiving interface;Variable anti-fake code ink layer is digitally sprayed on the surface of phantom imaging film containing cholesteric liquid crystal layer, and positioning hot stamping function film is prepared by drying in gradient temperature zone lower than liquid crystal layer thermal deformation temperature;Dynamic register is carried out by photoelectric alignment system, positioning hot stamping unit is used to apply positioning hot stamping load, and optical anti-fake layer is transferred to hot stamping bonding receiving interface with ink layer as a whole;After executing solidification and shaping treatment, carrier base film is stripped, and liquid crystal-digital composite anti-fake layer is formed, and surface micro-concave roller coating ultraviolet light curing wear-resistant varnish is crosslinked and cured.It realizes high-precision register, and constructs the multi-dimensional composite anti-fake label integrated with goniochromatic optical effect, polarization light development, digital anti-fake verification.

Description

Technical Field

[0001] This invention belongs to the field of anti-counterfeiting label preparation technology, specifically relating to a method for preparing a positioning hot stamping type liquid crystal phantom imaging anti-counterfeiting label. Background Technology

[0002] With the continuous development of packaging anti-counterfeiting technology, holographic imaging anti-counterfeiting technology has been widely used in the packaging of high-end products such as wine, pharmaceuticals, and cosmetics due to its unique optical anti-counterfeiting effect, direct visual recognition, and high difficulty in replication. Based on the selective reflective properties of cholesteric liquid crystals, liquid crystal holographic imaging film can present a dynamic optical effect of color changing with angle. Under polarized light, it can also reveal preset hidden anti-counterfeiting patterns, exhibiting excellent visual anti-counterfeiting performance.

[0003] Currently, the application of liquid crystal holographic imaging film in label products mainly adopts a lamination process, which involves laminating pre-made holographic imaging film onto the label substrate surface in a full-coverage or narrow-strip lamination manner. This process requires that the lamination direction be consistent with the printing paper feed direction, which greatly limits the usage form and application location of the film material.

[0004] However, existing lamination processes have several shortcomings: First, when applied to wide labels such as large-size bottle labels, large areas of holographic imaging film are required to meet the needs of full coverage or multiple laminations, resulting in high film consumption and manufacturing costs, which severely limits its widespread application in the large bottle label field. Second, anti-counterfeiting methods are relatively simple, relying solely on physical optical effects for anti-counterfeiting, lacking effective integration with digital anti-counterfeiting technologies, resulting in insufficient anti-counterfeiting layers and overall anti-counterfeiting performance that needs further improvement. Third, the positioning accuracy of the lamination process is limited, making it difficult to achieve small-area, high-precision local anti-counterfeiting pattern transfer, failing to meet the needs of refined and customized anti-counterfeiting designs. In addition, cholesteric liquid crystal layers are extremely sensitive to temperature, and the high temperatures of traditional hot stamping processes can easily cause damage or thermal deformation of the liquid crystal molecule orientation structure, thus losing the optical anti-counterfeiting effect of holographic imaging. To avoid thermal damage, the industry has been hoping to introduce a cold stamping process. However, since the liquid crystal holographic imaging film is a multi-layered composite functional structure, the traditional cold foil stamping process faces bottlenecks such as extremely low positioning accuracy, inability to accurately align variable data digital patterns, and insufficient interfacial adhesion on complex multi-layered film materials, which makes it easy to fall off.

[0005] Therefore, high-precision "positioning cold foil stamping" has long been a recognized challenge in the field of liquid crystal holographic imaging anti-counterfeiting, and is almost entirely unexplored. Developing a highly adaptable manufacturing process that can effectively protect the optical effects of liquid crystals, achieve high-precision positioning, and simultaneously support both hot and cold foil stamping is a technical problem that needs to be solved in the anti-counterfeiting label manufacturing industry. Summary of the Invention

[0006] To address the aforementioned problems in the existing technology, this invention provides a method for preparing a positioning hot stamping type liquid crystal holographic imaging anti-counterfeiting label. The objective of this invention can be achieved through the following technical solution: S1: Obtain a label substrate, print a basic graphic layer on the surface of the label substrate, and perform surface activation treatment on a predetermined hot stamping area of ​​the label substrate using corona discharge to construct a hot stamping adhesive receiving interface for enhancing the interfacial bonding strength of the hot stamping layer. S2: Obtain a phantom imaging film containing a cholesteric liquid crystal layer as a transfer carrier. Form an ink layer containing variable anti-counterfeiting character codes and matrix QR codes on the release transfer layer surface of the phantom imaging film using a piezoelectric digital inkjet printing process. Send the ink layer into a gradient temperature zone hot air drying assembly and dry and cure it at a temperature lower than the heat distortion temperature of the cholesteric liquid crystal layer to obtain a positioning hot stamping functional film. S3: The label substrate and the positioning hot stamping functional film are simultaneously fed into the positioning hot stamping unit with a photoelectric alignment system. The positioning target is identified and dynamically registered. The positioning hot stamping load is applied to the predetermined hot stamping area after stacking. The optical anti-counterfeiting layer of the positioning hot stamping functional film, together with the digital ink layer, is transferred and bonded to the hot stamping bonding receiving interface. S4: The hot-stamped label substrate is cured and shaped. The polyester carrier base film of the positioning hot-stamping functional film is peeled off. A liquid crystal-digital composite anti-counterfeiting layer is formed in the predetermined hot-stamping area of ​​the label substrate. A UV-curable wear-resistant varnish is coated on the surface of the composite anti-counterfeiting layer by micro-gravity roller coating. The varnish is then cross-linked and cured by UV irradiation to obtain a positioning hot-stamped liquid crystal phantom imaging anti-counterfeiting label.

[0007] Specifically, the surface activation process of the corona discharge treatment includes: A localized directional plasma modification method is adopted, in which atmospheric pressure air plasma is applied to the predetermined hot stamping area, and the corona discharge treatment and the printing of the basic graphic layer are carried out sequentially along the material feeding direction. The processing speed and printing speed are dynamically synchronized and matched. The plasma action area is limited by the insulation shielding method, and the predetermined hot stamping area is surface activated and modified. The non-hot stamping area maintains its original surface physical state under the shielding state.

[0008] Specifically, the hot stamping adhesive receiving interface includes a hot melt adhesive receiving interface for positioning the hot stamping process, and a UV cold stamping adhesive receiving interface for positioning the cold stamping process. A digital trajectory coating method is adopted, driving the coating head to perform continuous graphic trajectory movement along the geometric contour path of the predetermined hot stamping area, continuously coating liquid hot melt adhesive material inside the predetermined hot stamping area. After coating, the liquid hot melt adhesive performs self-leveling diffusion on the surface of the label substrate to form a uniform and flat bonding interface layer. The coating center position is adjusted in real time to align with the predetermined hot stamping area, and the outer periphery of the adhesive layer is aligned with the outer edge contour of the predetermined hot stamping area to obtain the hot melt adhesive receiving interface. Using a digital graphic coating or printing method, liquid UV cold foil adhesive material is continuously applied to the interior of the predetermined hot stamping area and leveled. The outer periphery of the adhesive layer is aligned with the outer edge contour of the predetermined hot stamping area to obtain the UV cold foil receiving interface.

[0009] Specifically, the transfer carrier is a multi-layered, sequentially stacked composite functional structure, comprising a layered structure and a transfer process: A release transfer layer is formed by coating and curing on the surface of a polyester carrier film; a cholesteric liquid crystal layer is formed by coating and oriented on the surface of the release transfer layer; a metal reflective layer with total reflection properties is deposited on the surface of the cholesteric liquid crystal layer to construct an optical interlocking structure; a surface adhesive layer or interface resin underlayer adapted to the hot stamping bonding receiving interface is coated on the surface of the metal reflective layer. During hot stamping transfer, the surface adhesive layer or interface resin underlayer is tightly bonded to the hot stamping adhesive receiving interface; during peeling, the release transfer layer separates from the polyester carrier base film at the interface, and the release transfer layer, cholesteric liquid crystal layer, metal reflective layer and surface adhesive layer or interface resin underlayer are retained on the surface of the label substrate as a whole, forming a complete transfer-type anti-counterfeiting functional layer.

[0010] Specifically, the process of forming the ink layer includes: A variable digital code stream is acquired and transmitted to the printing control terminal to generate a printing dot matrix signal. During the printing alignment stage, the center coordinates of the hidden anti-counterfeiting pattern on the phantom imaging film are identified by optical scanning. The positional deviation between the center coordinates of the hidden anti-counterfeiting pattern and the preset printing baseline is calculated. The positional deviation is fed back to the printhead drive terminal to dynamically adjust the horizontal and vertical printing coordinates of the printhead. The printhead is controlled to spray ink droplets onto the surface of the release transfer layer to form the variable anti-counterfeiting character code and matrix QR code.

[0011] Specifically, the drying and curing of the ink layer includes: Multiple continuously distributed drying sections with independently controlled heat input are arranged along the material feeding direction. Circulating hot air is sprayed onto the surface of the printed phantom imaging film within each drying section. The temperature control parameters of each drying section are configured according to the drying state of the ink layer. The feeding speed is adjusted to match the total length of the drying sections, driving the phantom imaging film with the ink layer to pass through each drying section sequentially for solvent removal and resin crosslinking. The drying temperature is controlled within a preset range below the heat distortion temperature of the liquid crystal layer to obtain a positioning hot stamping functional film.

[0012] Specifically, the positioning hot stamping functional film includes a hot stamping type positioning hot stamping functional film and a cold stamping type positioning hot stamping functional film: During the positioning hot stamping process, the transfer carrier is coated with a hot stamping adhesive layer with heat-sensitive bonding properties on the surface of the metal reflective layer to form a hot stamping positioning hot stamping functional film, which undergoes interfacial melting and bonding with the hot melt adhesive receiving interface under hot-press transfer state. During the positioning cold foil stamping process, the transfer carrier is coated with an interface resin underlayer having photosensitive bonding properties, pressure-sensitive bonding properties, or compatibility with external UV cold foil stamping adhesive on the surface of the metal reflective layer, forming a cold foil stamping positioning hot foil stamping functional film, which cures and bonds with the UV cold foil stamping adhesive receiving interface under cold pressure transfer state.

[0013] Specifically, the target identification process includes: A cross-shaped positioning target is printed around the predetermined hot stamping area of ​​the label substrate, and a matching target is set at the corresponding position of the positioning hot stamping functional film. The positioning target image on the surface of the label substrate and the matching target image on the surface of the positioning hot stamping functional film are collected by photoelectric sensor probe, and the geometric edge feature information and center coordinate data of each image are extracted to complete the target recognition and reference positioning before hot stamping.

[0014] Specifically, the dynamic registration process includes: During continuous production and conveying, the position signals of the positioning target and the alignment target are continuously collected, and the lateral and longitudinal misalignment between the current actual coordinates of the material and the target reference coordinates are calculated. The lateral and longitudinal misalignment are fed back to the control terminal in real time, and the material trajectory is adjusted to compensate for lateral displacement and adjust the gradient distribution of conveying tension to dynamically correct spatial misalignment. The response frequency of the control terminal is adjusted in real time according to the actual material speed, and the alignment correction rate is adjusted synchronously with the production speed to realize dynamic alignment control in continuous production.

[0015] Specifically, the positioning hot stamping unit structure and the application process of the positioning hot stamping load include: when the hot stamping bonding receiving interface is a hot melt adhesive receiving interface, the positioning hot stamping unit is configured as a flat pressure hot stamping unit, and the positioning hot stamping load is configured as a constant pressure superimposed with a melting hot stamping temperature, driving the hot stamping positioning hot stamping functional film and the substrate to be heated and melted together; when the hot stamping bonding receiving interface is a UV cold hot stamping adhesive receiving interface, the positioning hot stamping unit is configured as a cold pressure transfer unit, and the positioning hot stamping load is configured as a cold pressure load and simultaneously subjected to ultraviolet irradiation, driving the cold hot stamping adhesive to undergo cross-linking polymerization to solidify the cold hot stamping positioning hot stamping functional film and the substrate at room temperature.

[0016] Specifically, the curing and shaping process and the peeling process include: During the positioning hot stamping process, the label substrate, after being conveyed and hot-pressed, is sequentially cooled and shaped in sections through multiple preset temperature gradient cooling zones arranged along the material running trajectory. During the positioning cold foil stamping process, the label substrate, after being conveyed, cold-pressed, and cured by ultraviolet light, sequentially passes through the room temperature holding section along the material running trajectory for stable shaping; The peeling operation is performed at the cooling or stabilization termination position. The preset physical peeling angle is controlled between the polyester carrier base film and the label substrate in the direction of travel. The winding tension is adjusted to keep the mechanical peeling force during the separation process of the polyester carrier base film in a dynamic constant state. The polyester carrier base film is driven to detach and move out of the label substrate surface. The optical anti-counterfeiting layer and the digital ink layer are left on the label substrate surface as a whole.

[0017] Specifically, the formation process of the liquid crystal-digital composite anti-counterfeiting layer includes: After peeling off the polyester carrier film, based on the relationship between liquid crystal molecule orientation and stacked physical structure, the reflective surface of the cholesteric liquid crystal layer is configured as a base layer that presents a color-dependent pattern; the anisotropic structure inside the cholesteric liquid crystal layer is configured as a polarized optical layer that demodulates and hides the pattern by polarized light transmission; the ink layer containing the variable anti-counterfeiting character code and matrix QR code is configured as a digital layer that responds to machine optical scanning to read feature data, so that the three functional structures of the base layer, the optical layer and the digital layer are kept in a stacked state to form the liquid crystal-digital composite anti-counterfeiting layer.

[0018] Specifically, the cross-linking and curing process includes: The UV-curable wear-resistant varnish is quantitatively intercepted and transferred by microcavities on an anilox roller with a quantitative ink-carrying volume. The surface of the anilox roller carrying the varnish is controlled to form a reverse frictional contact with the label substrate, and a liquid varnish film layer of uniform thickness is coated on the surface of the liquid crystal-digital composite anti-counterfeiting layer. After coating, the label substrate is transported into a multi-segment UV irradiation zone. The photoinitiator in the varnish system is excited by UV light with gradient power to generate active components, triggering the polymerization and cross-linking reaction of the resin components to form a solid wear-resistant protective layer with a dense network cross-linked structure.

[0019] The beneficial effects of this invention are as follows: (1) This invention uses a positioning hot stamping process to replace the traditional lamination process, which can transfer the phantom imaging film to a predetermined area of ​​the label substrate by local hot stamping. It eliminates the need for full-coverage or long strip lamination, significantly reducing the area of ​​the phantom imaging film and effectively reducing the amount of film material used and the manufacturing cost. In the application scenarios of wide labels such as large-size bottle labels, only a small area of ​​phantom imaging film needs to be hot stamped in the designated area to achieve the anti-counterfeiting effect, avoiding the waste of film material caused by full-coverage or multiple strip lamination in the traditional lamination process, and reducing the cost of anti-counterfeiting application of large bottle labels. At the same time, the positioning hot stamping process is not limited by the printing paper direction, and the application position and shape of the film material are more flexible, which can meet the anti-counterfeiting needs of different specifications and designs of labels, and broaden the application scope of phantom imaging anti-counterfeiting technology.

[0020] (2) This invention organically combines physical optical anti-counterfeiting and digital anti-counterfeiting technologies to construct a triple anti-counterfeiting system, significantly improving the overall anti-counterfeiting performance. The cholesteric liquid crystal layer and the metal reflective layer work together to achieve angle-dependent color variation and polarized light development effects, forming two physical optical anti-counterfeiting barriers with physically uncopyable characteristics, making it difficult for counterfeiters to imitate through printing or photocopying. On this basis, the digitally printed variable anti-counterfeiting character code and matrix QR code constitute the third digital anti-counterfeiting barrier, which can be verified online by machine scanning, realizing mutual verification between physical and digital anti-counterfeiting. The triple anti-counterfeiting system is progressive and rich in anti-counterfeiting levels, effectively increasing the threshold and cost of counterfeiting and enhancing the overall anti-counterfeiting performance and reliability of the anti-counterfeiting label.

[0021] (3) The present invention adopts a gradient temperature drying process below the heat distortion temperature of the liquid crystal layer, which effectively avoids the damage of high temperature to the orientation structure of liquid crystal molecules and ensures the stability of the optical effect of phantom imaging; at the same time, the photoelectric alignment dynamic registration technology realizes high-precision positioning hot stamping, with high alignment accuracy and good product consistency.

[0022] (4) This invention can simultaneously realize two different anti-counterfeiting label processing and manufacturing methods: hot stamping and cold stamping. By designing two targeted and optimized film structures, the process can leverage the strong bonding strength of traditional hot stamping, and also solve the problem that liquid crystal phantom imaging films cannot be subjected to high-precision "cold stamping". When using cold stamping positioning hot stamping functional film and corresponding processes, the entire process does not require high-temperature hot pressing, completely eliminating the potential damage of heat energy to the orientation of cholesteric liquid crystal molecules, and ensuring the high stability of the phantom imaging optical effect. Attached Figure Description

[0023] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0024] Figure 1 This is a schematic flowchart of a method for preparing a positioning hot stamping type liquid crystal holographic imaging anti-counterfeiting label according to the present invention; Figure 2 This is a schematic diagram of the preparation method of a positioning hot stamping type liquid crystal phantom imaging anti-counterfeiting label according to the present invention. Detailed Implementation

[0025] To further illustrate the technical means and effects of the present invention in achieving the intended purpose, the following detailed description of the specific implementation methods, structures, features and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided.

[0026] Please see Figures 1-2 A method for preparing a positioning hot stamping type liquid crystal holographic imaging anti-counterfeiting label, comprising: S1: Obtain a label substrate, print a basic graphic layer on the surface of the label substrate, and perform surface activation treatment on a predetermined hot stamping area of ​​the label substrate using corona discharge to construct a hot stamping adhesive receiving interface for enhancing the interfacial bonding strength of the hot stamping layer. S2: Obtain a phantom imaging film containing a cholesteric liquid crystal layer as a transfer carrier. Form an ink layer containing variable anti-counterfeiting character codes and matrix QR codes on the release transfer layer surface of the phantom imaging film using a piezoelectric digital inkjet printing process. Send the ink layer into a gradient temperature zone hot air drying assembly and dry and cure it at a temperature lower than the heat distortion temperature of the cholesteric liquid crystal layer to obtain a positioning hot stamping functional film. S3: The label substrate and the positioning hot stamping functional film are simultaneously fed into the positioning hot stamping unit with a photoelectric alignment system. The positioning target is identified and dynamically registered. The positioning hot stamping load is applied to the predetermined hot stamping area after stacking. The optical anti-counterfeiting layer of the positioning hot stamping functional film, together with the digital ink layer, is transferred and bonded to the hot stamping bonding receiving interface. S4: The hot-stamped label substrate is cured and shaped. The polyester carrier base film of the positioning hot-stamping functional film is peeled off. A liquid crystal-digital composite anti-counterfeiting layer is formed in the predetermined hot-stamping area of ​​the label substrate. A UV-curable wear-resistant varnish is coated on the surface of the composite anti-counterfeiting layer by micro-gravity roller coating. The varnish is then cross-linked and cured by UV irradiation to obtain a positioning hot-stamped liquid crystal phantom imaging anti-counterfeiting label.

[0027] Specifically, the surface activation process of the corona discharge treatment includes: A localized directional plasma modification method is adopted, in which atmospheric pressure air plasma is applied to the predetermined hot stamping area, and the corona discharge treatment and the printing of the basic graphic layer are carried out sequentially along the material feeding direction. The processing speed and printing speed are dynamically synchronized and matched. The plasma action area is limited by the insulation shielding method, and the predetermined hot stamping area is surface activated and modified. The non-hot stamping area maintains its original surface physical state under the shielding state.

[0028] Specifically, the hot stamping adhesive receiving interface includes a hot melt adhesive receiving interface for positioning the hot stamping process, and a UV cold stamping adhesive receiving interface for positioning the cold stamping process. A digital trajectory coating method is adopted, driving the coating head to perform continuous graphic trajectory movement along the geometric contour path of the predetermined hot stamping area, continuously coating liquid hot melt adhesive material inside the predetermined hot stamping area. After coating, the liquid hot melt adhesive performs self-leveling diffusion on the surface of the label substrate to form a uniform and flat bonding interface layer. The coating center position is adjusted in real time to align with the predetermined hot stamping area, and the outer periphery of the adhesive layer is aligned with the outer edge contour of the predetermined hot stamping area to obtain the hot melt adhesive receiving interface. Using a digital graphic coating or printing method, liquid UV cold foil adhesive material is continuously applied to the interior of the predetermined hot stamping area and leveled. The outer periphery of the adhesive layer is aligned with the outer edge contour of the predetermined hot stamping area to obtain the UV cold foil receiving interface.

[0029] Specifically, the transfer carrier is a multi-layered, sequentially stacked composite functional structure, comprising a layered structure and a transfer process: A release transfer layer is formed by coating and curing on the surface of a polyester carrier film; a cholesteric liquid crystal layer is formed by coating and oriented on the surface of the release transfer layer; a metal reflective layer with total reflection properties is deposited on the surface of the cholesteric liquid crystal layer to construct an optical interlocking structure; a surface adhesive layer or interface resin underlayer adapted to the hot stamping bonding receiving interface is coated on the surface of the metal reflective layer. During hot stamping transfer, the surface adhesive layer or interface resin underlayer is tightly bonded to the hot stamping adhesive receiving interface; during peeling, the release transfer layer separates from the polyester carrier base film at the interface, and the release transfer layer, cholesteric liquid crystal layer, metal reflective layer and surface adhesive layer or interface resin underlayer are retained on the surface of the label substrate as a whole, forming a complete transfer-type anti-counterfeiting functional layer.

[0030] Specifically, the process of forming the ink layer includes: A variable digital code stream is acquired and transmitted to the printing control terminal to generate a printing dot matrix signal. During the printing alignment stage, the center coordinates of the hidden anti-counterfeiting pattern on the phantom imaging film are identified by optical scanning. The positional deviation between the center coordinates of the hidden anti-counterfeiting pattern and the preset printing baseline is calculated. The positional deviation is fed back to the printhead drive terminal to dynamically adjust the horizontal and vertical printing coordinates of the printhead. The printhead is controlled to spray ink droplets onto the surface of the release transfer layer to form the variable anti-counterfeiting character code and matrix QR code.

[0031] Specifically, the drying and curing of the ink layer includes: Multiple continuously distributed drying sections with independently controlled heat input are arranged along the material feeding direction. Circulating hot air is sprayed onto the surface of the printed phantom imaging film within each drying section. The temperature control parameters of each drying section are configured according to the drying state of the ink layer. The feeding speed is adjusted to match the total length of the drying sections, driving the phantom imaging film with the ink layer to pass through each drying section sequentially for solvent removal and resin crosslinking. The drying temperature is controlled within a preset range below the heat distortion temperature of the liquid crystal layer to obtain a positioning hot stamping functional film.

[0032] Specifically, the positioning hot stamping functional film includes a hot stamping type positioning hot stamping functional film and a cold stamping type positioning hot stamping functional film: During the positioning hot stamping process, the transfer carrier is coated with a hot stamping adhesive layer with heat-sensitive bonding properties on the surface of the metal reflective layer to form a hot stamping positioning hot stamping functional film, which undergoes interfacial melting and bonding with the hot melt adhesive receiving interface under hot-press transfer state. During the positioning cold foil stamping process, the transfer carrier is coated with an interface resin underlayer having photosensitive bonding properties, pressure-sensitive bonding properties, or compatibility with external UV cold foil stamping adhesive on the surface of the metal reflective layer, forming a cold foil stamping positioning hot foil stamping functional film, which cures and bonds with the UV cold foil stamping adhesive receiving interface under cold pressure transfer state.

[0033] Specifically, the temperature parameter adjustment process of the drying section includes: real-time acquisition of hot air temperature data inside each drying section and interactive transmission to the control terminal for closed-loop feedback calculation; dynamic adjustment of the power output of the heating element to maintain the stable operating temperature of each section; adjustment of the heat input difference between adjacent drying sections to control the local temperature gradient on the material's trajectory to be continuously and smoothly distributed; detection of dynamic fluctuation parameters of the material feeding speed; correction of the temperature setpoint of each drying section; and driving the ink layer to sequentially undergo gradient heating drying and gradient cooling shaping during the material feeding process.

[0034] Specifically, the target identification process includes: A cross-shaped positioning target is printed around the predetermined hot stamping area of ​​the label substrate, and a matching target is set at the corresponding position of the positioning hot stamping functional film. The positioning target image on the surface of the label substrate and the matching target image on the surface of the positioning hot stamping functional film are collected by photoelectric sensor probe, and the geometric edge feature information and center coordinate data of each image are extracted to complete the target recognition and reference positioning before hot stamping.

[0035] Specifically, the dynamic registration process includes: During continuous production and conveying, the position signals of the positioning target and the alignment target are continuously collected, and the lateral and longitudinal misalignment between the current actual coordinates of the material and the target reference coordinates are calculated. The lateral and longitudinal misalignment are fed back to the control terminal in real time, and the material trajectory is adjusted to compensate for lateral displacement and adjust the gradient distribution of conveying tension to dynamically correct spatial misalignment. The response frequency of the control terminal is adjusted in real time according to the actual material speed, and the alignment correction rate is adjusted synchronously with the production speed to realize dynamic alignment control in continuous production.

[0036] Specifically, the positioning hot stamping unit structure and the application process of the positioning hot stamping load include: when the hot stamping bonding receiving interface is a hot melt adhesive receiving interface, the positioning hot stamping unit is configured as a flat pressure hot stamping unit, and the positioning hot stamping load is configured as a constant pressure superimposed with a melting hot stamping temperature, driving the hot stamping positioning hot stamping functional film and the substrate to be heated and melted together; when the hot stamping bonding receiving interface is a UV cold hot stamping adhesive receiving interface, the positioning hot stamping unit is configured as a cold pressure transfer unit, and the positioning hot stamping load is configured as a cold pressure load and simultaneously subjected to ultraviolet irradiation, driving the cold hot stamping adhesive to undergo cross-linking polymerization to solidify the cold hot stamping positioning hot stamping functional film and the substrate at room temperature.

[0037] Specifically, the curing and shaping process and the peeling process include: During the positioning hot stamping process, the label substrate, after being conveyed and hot-pressed, is sequentially cooled and shaped in sections through multiple preset temperature gradient cooling zones arranged along the material running trajectory. During the positioning cold foil stamping process, the label substrate, after being conveyed, cold-pressed, and cured by ultraviolet light, sequentially passes through the room temperature holding section along the material running trajectory for stable shaping; The peeling operation is performed at the cooling or stabilization termination position. The preset physical peeling angle is controlled between the polyester carrier base film and the label substrate in the direction of travel. The winding tension is adjusted to keep the mechanical peeling force during the separation process of the polyester carrier base film in a dynamic constant state. The polyester carrier base film is driven to detach and move out of the label substrate surface. The optical anti-counterfeiting layer and the digital ink layer are left on the label substrate surface as a whole.

[0038] Specifically, the formation process of the liquid crystal-digital composite anti-counterfeiting layer includes: After peeling off the polyester carrier film, based on the relationship between liquid crystal molecule orientation and stacked physical structure, the reflective surface of the cholesteric liquid crystal layer is configured as a base layer that presents a color-dependent pattern; the anisotropic structure inside the cholesteric liquid crystal layer is configured as a polarized optical layer that demodulates and hides the pattern by polarized light transmission; the ink layer containing the variable anti-counterfeiting character code and matrix QR code is configured as a digital layer that responds to machine optical scanning to read feature data, so that the three functional structures of the base layer, the optical layer and the digital layer are kept in a stacked state to form the liquid crystal-digital composite anti-counterfeiting layer.

[0039] Specifically, the cross-linking and curing process includes: The UV-curable wear-resistant varnish is quantitatively intercepted and transferred by microcavities on an anilox roller with a quantitative ink-carrying volume. The surface of the anilox roller carrying the varnish is controlled to form a reverse frictional contact with the label substrate, and a liquid varnish film layer of uniform thickness is coated on the surface of the liquid crystal-digital composite anti-counterfeiting layer. After coating, the label substrate is transported into a multi-segment UV irradiation zone. The photoinitiator in the varnish system is excited by UV light with gradient power to generate active components, triggering the polymerization and cross-linking reaction of the resin components to form a solid wear-resistant protective layer with a dense network cross-linked structure.

[0040] Example 1: Positioning Hot Stamping Process Based on Hot Melt Adhesive and Hot Stamping Film Structure This embodiment provides a complete manufacturing process for a positioning hot stamping type liquid crystal holographic imaging anti-counterfeiting label, and its specific processing steps are as follows: Step 1: Construct the hot stamping adhesive receiving interface (one form of the hot stamping adhesive receiving interface) A paper-based label substrate M1 with a preset surface density and flatness is obtained. A basic graphic layer is printed on the surface of the label substrate M1 using a flexographic printing unit. Subsequently, along the material travel direction, a localized directional plasma modification effect is applied to a predetermined hot stamping area A1 of the label substrate M1 using an atmospheric pressure air plasma generator. The plasma modification processing speed and the printing speed of the basic graphic layer are controlled at a dynamic synchronization matching rate V1. The physical boundary of the plasma action is limited by an insulating shielding fixture to perform surface activation modification on the predetermined hot stamping area A1 to regulate its surface free energy, while the non-hot stamping area maintains its original physical surface state under the shielding state.

[0041] After modification, the digital trajectory coating head is driven to perform continuous graphic trajectory movement along the geometric contour path C1 of the predetermined hot stamping area A1, continuously coating liquid hot melt adhesive material within the area. After coating, the liquid hot melt adhesive undergoes self-leveling diffusion on the substrate surface, forming a uniform and smooth bonding interface layer with a thickness of H1. During the coating process, the coating center position is adjusted in real time to align with the geometric center of the predetermined hot stamping area A1, and the outer peripheral boundary of the adhesive layer is rigidly aligned with the outer edge contour of the area, thus constructing the hot stamping bonding receiving interface I1.

[0042] Step 2: Preparation of positioning hot stamping functional film A phantom imaging film containing a cholesteric liquid crystal layer was obtained as a transfer carrier. The transfer carrier is a multi-layered, sequentially stacked composite functional structure, comprising: a release transfer layer formed by coating and curing on the surface of a polyester carrier base film F1; and the cholesteric liquid crystal layer (whose physical heat distortion critical temperature is T) formed on the surface of the release transfer layer by coating and orientation. LC1 ); deposit a metal reflective layer with total internal reflection properties on the surface of the cholesteric liquid crystal layer to construct an optical interlocking structure; and coat the surface of the metal reflective layer with a hot stamping adhesive layer with thermally sensitive bonding properties.

[0043] On the surface of the release transfer layer, ink droplets are sprayed using a piezoelectric digital inkjet printing process to form an ink layer containing variable anti-counterfeiting character codes and matrix QR codes. The film material is then fed into a hot air drying assembly with three continuously distributed and independently controlled gradient temperature zones for heat input. The film material feed speed is adjusted to match the total length L1 of the drying zones. The ambient hot air temperature within each of the three drying zones is set to T. 11 T 12 T 13 The temperature setpoint T for the second drying section is... 12 Greater than the temperature set value T of the first drying section 11 And greater than the temperature set value T of the third drying section. 13This creates an arched temperature flow field in each drying zone, where the temperature first rises and then falls. Furthermore, the highest operating temperature in each zone throughout the process satisfies the following physical boundary constraint: max(T 11 ,T 12 ,T 13 ) <T LC1 , The ink layer passes through the three temperature zones sequentially along with the film material. Solvent removal and resin crosslinking are performed without damaging the original molecular orientation structure of the cholesteric liquid crystal layer. After drying and curing, a positioning hot stamping functional film is obtained.

[0044] Step 3: Flat-press hot-press positioning and transfer The label substrate M1 and the positioning hot stamping functional film are simultaneously fed into a flatbed hot stamping unit equipped with a photoelectric alignment system. During the inkjet printing alignment and lamination stages, photoelectric sensors capture and acquire in real time the images of the cross-shaped positioning target printed on the surface of the label substrate M1 and the alignment matching target images on the surface of the positioning hot stamping functional film, respectively, and extract the geometric edge feature information and center coordinate data of each image. The main control unit calculates the relative planar deviation value of the two in real time, obtaining the lateral misalignment ΔX1 and the longitudinal misalignment ΔY1. The misalignment signal is fed back to the registration adjustment mechanism to adjust the material feeding trajectory for lateral displacement compensation and adjust the gradient distribution of the conveying tension to compensate for spatial misalignment in real time. At the same time, the response frequency f1 of the control unit is adjusted in real time according to the dynamic fluctuation of the material feeding speed, so that the alignment correction rate is adjusted synchronously with the production speed.

[0045] After dynamic registration and stacking are completed, the flat-press hot stamping block is driven to perform a vertical downward pressing action, controlling its hot-pressing surface to maintain a parallel and mating contact with the label substrate surface. At this time, the positioning hot stamping load is configured as a constant pressure superimposed with a constant melting hot stamping temperature, applying a constant mechanical extrusion load P1 and a constant melting hot stamping temperature T to the stacked predetermined hot stamping area A1. stamp1 The vertical hot-pressing state is maintained until the set time period t1. During this time, the hot stamping adhesive layer softens due to heat and undergoes molecular-level diffusion and interfacial melting bonding with the hot stamping bonding receiving interface I1, transferring and bonding each functional layer of the positioning hot stamping functional film together with the ink layer to the hot stamping bonding receiving interface.

[0046] Step 4: Segmented cooling and surface curing After hot pressing, the label substrate sequentially passes through multiple pre-defined temperature gradient cooling zones arranged along the material's travel trajectory for segmented cooling and shaping. The hot-pressed label substrate is controlled to sequentially pass through each cooling zone along the material's travel trajectory, employing a multi-stage gradient cooling process to control the surface heat of the substrate to decrease stepwise as the cooling process progresses. At the cooling termination point, a peel release is performed, controlling the polyester carrier film F1 to form a pre-defined physical peel angle θ1 between the traveling direction of the label substrate and the polyester carrier film. The winding tension is adjusted to maintain a dynamically constant mechanical peel force during the separation process of the polyester carrier film, driving the polyester carrier film F1 to detach and move away from the label substrate surface. This allows the release transfer layer, cholesteric liquid crystal layer, metal reflective layer, and hot stamping adhesive layer to remain on the label substrate surface due to the heterogeneity of their physical adhesion, forming a liquid crystal-digital composite anti-counterfeiting layer on the surface of the predetermined hot stamping area A1.

[0047] Subsequently, using a specific quantitative ink-carrying volume V cell1 The microcavities of the anilox roller quantitatively intercept and transfer UV-cured wear-resistant varnish, controlling the surface of the anilox roller to form reverse frictional contact with the label substrate, thus coating a uniformly thick liquid varnish film on the surface of the liquid crystal-digital composite anti-counterfeiting layer. Finally, the substrate is controlled to be fed into a multi-segment UV irradiation zone, where the photoinitiator in the varnish system is activated by the gradient power UV radiation field to generate active components, triggering the polymerization and cross-linking reactions of the resin components, driving the liquid varnish film to transform into a solid wear-resistant protective layer with a dense network cross-linked structure, resulting in the final positioning hot-stamped liquid crystal phantom imaging anti-counterfeiting label.

[0048] Example 2: Combination of thin film substrate with four-stage high-speed drying process This embodiment focuses on the manufacturing process of film label substrate combined with high-speed four-stage temperature zone drying. Its basic processing steps are the same as those in Embodiment 1, the difference being: In step 1, the film label substrate M2 is obtained and a basic graphic layer is printed. Then, atmospheric pressure air plasma is used for bombardment modification. After modification, the liquid hot melt adhesive is driven to flow and level, forming a uniform and smooth bonding interface layer, and the material feed rate is increased to a high-speed synchronous rate.

[0049] In step 2, this high-speed drying process is universally applicable in terms of both time and space for the preparation of hot-stamping and cold-stamping positioning heat-printing functional films. The digitally printed film is fed into a hot air drying assembly with four continuously distributed and independently temperature-controlled gradient temperature zones. The temperature parameters of the four ambient hot air zones exhibit a smooth, gradually decreasing, arched transition distribution along the high-speed material flow direction. Throughout the process, online temperature sensors are used for high-speed dynamic temperature-rate matching and closed-loop feedback calculations to drive the output of the heating elements, adjust the heat input difference between each drying zone, and control the continuous transition of the local temperature gradient. The maximum drying operating temperature of each drying zone is rigidly controlled within the physical boundary below the critical temperature for heat deformation of the liquid crystal layer. After drying and curing, the positioning heat-printing functional film is obtained.

[0050] In steps 3 and 4, at a high flow rate, the system adaptively adjusts the registration response adjustment frequency of the control terminal to implement high-precision dynamic registration; subsequently, the positioning hot stamping unit structure and the application process of the positioning hot stamping load, as well as the subsequent curing and shaping process and peeling process, directly refer to and follow the corresponding hot stamping or cold stamping process diversion operation described in the claims to complete the transfer and shaping of the anti-counterfeiting label.

[0051] Example 3: High Dynamic Speed ​​Fluctuation Compensation Technology This embodiment focuses on demonstrating the adaptive control and linkage temperature compensation process in the production line when faced with dynamic fluctuations in conveyor speed. Its basic processing steps are the same as in Embodiment 1, with the following differences: In step 2, this speed fluctuation compensation control is universally applicable to both hot stamping and cold stamping processes. When the sensor detects dynamic fluctuations in the material conveying speed beyond the reference rate, the control unit, based on a preset dynamic compensation matrix, collects hot air temperature data from each drying section in real time and transmits it to the control unit for closed-loop feedback calculation. It dynamically adjusts the power output of the heating elements to correct the temperature setpoints of each drying section, adaptively and in conjunction with the control of the heat input difference between adjacent sections, ensuring a continuous and smooth transition of the local temperature gradient. This ensures that the cumulative heat input received by the ink layer during flow remains constant, and that the maximum drying temperature throughout the process is rigidly limited to a preset range below the heat distortion temperature of the liquid crystal layer, thus producing a positioning hot stamping functional film.

[0052] In steps 3 and 4, while the control terminal detects the speed fluctuation parameter, it adaptively fine-tunes the registration response adjustment frequency of the control terminal, driving the alignment correction rate to change synchronously with the production speed; and it also adjusts the subsequent shaping section in conjunction with the application process of the positioning hot stamping unit and the positioning hot stamping load, as well as the curing and shaping process and physical peeling process, directly referencing and adopting the flat pressure hot stamping segmented cooling shaping operation or cold pressure transfer light curing shaping operation described in the claims, and adjusting the winding torque in a closed loop to maintain the dynamic constant mechanical peeling force.

[0053] Example 4: Selective Positioning Cold Ironing Process Based on UV Cold Ironing Adhesive and Cold Ironing Film Structure This embodiment provides a complete manufacturing process for high-precision positioning cold foil labels at room temperature without relying on heat energy input, through photocuring linkage. The specific processing steps are as follows: Step 1: Construct the UV cold foil adhesive receiving interface (one form of the hot foil bonding receiving interface) A thin-film label substrate M5 is obtained and a basic graphic layer is printed. A localized, directional plasma modification bombardment is applied using an atmospheric pressure air plasma generator to significantly increase its surface free energy. After modification, a digital trajectory coating head or a printing screen is driven to perform continuous graphic trajectory movement according to the geometric contour path of the predetermined hot stamping area A5. Liquid high-viscosity UV-curable cold stamping adhesive ink is continuously coated and leveled within the area. The outer perimeter of the adhesive layer is precisely aligned with the outer edge contour of the predetermined hot stamping area, thus constructing the UV cold stamping adhesive receiving interface I5.

[0054] Step 2: Preparation of Positioning Cold Ironing Functional Film A composite transfer carrier containing a cholesteric liquid crystal layer was obtained. To perfectly adapt to the cold foil stamping process at the physical material level, the transfer carrier was configured as a dedicated cold foil stamping functional film structure, specifically including a release transfer layer formed by coating and curing on the surface of a polyester carrier base film, a cholesteric liquid crystal layer (physical heat distortion critical temperature of TLC5) formed by coating and orientation, a metal reflective layer with total internal reflection properties deposited to construct an optical interlocking structure, and an interface resin underlayer with high free radical surface affinity coated on the surface of the metal reflective layer (i.e., a dedicated cold foil stamping film structure without heat-sensitive adhesive).

[0055] An ink layer is formed on the surface of the release transfer layer using a piezoelectric digital inkjet printing process. The film is then fed into a gradient temperature zone hot air drying assembly for low-heat rapid drying. An online temperature sensor collects real-time hot air data from the drying zone and transmits it to the control unit for closed-loop feedback calculations. This adjusts the output power of the heating elements and the heat input difference between adjacent drying zones, ensuring a continuous and smooth transition of the local temperature gradient along the material's path. The entire operating temperature is rigidly limited to an ultra-low temperature range of room temperature to 40°C (far below the liquid crystal layer's heat distortion temperature TLC5). After solvent removal, drying, and curing, a cold-stamping positioning heat-printing functional film is obtained.

[0056] Step 3: Cold pressing and registration with photopolymerization and transfer The label substrate M5 and the positioning cold foil functional film are simultaneously transported to the cold pressing transfer unit. The cross-shaped positioning target on the substrate and the matching target image on the functional film are captured by the photoelectric sensing component. The edge features are calculated and extracted and fed back to the registration adjustment mechanism in real time to perform high-frequency alignment correction to complete dynamic registration.

[0057] After lamination, the positioning hot stamping unit is configured as a cold press transfer unit, and the positioning hot stamping load is configured as a cold press load and simultaneously subjected to ultraviolet irradiation. A constant cold press load P5 is applied by the driving cold press rollers (without any heat input throughout the entire process). While the two films are tightly pressed together, the high-power UV-LED light source inside the unit (working wavelength 365nm~395nm) instantly reverses the transmission of light through the polyester carrier film. The ultraviolet light penetrates the functional film layer and directly irradiates the UV cold stamping adhesive within the predetermined area A5, instantly stimulating the cold stamping adhesive to undergo a highly efficient cross-linking polymerization reaction, directly generating a strong bond at room temperature, thus solidifying the cold stamping positioning hot stamping functional film and the substrate at the entire interface.

[0058] Step 4: Room temperature stabilization and setting, and protection of the peeling surface layer. At the end of the photocuring transfer, the label substrate and film material have achieved full interface bonding at room temperature. At this point, the curing and shaping process is configured to transport the label substrate sequentially through the room temperature holding section along the material's trajectory for stable shaping. At the end of the stable shaping, a peeling operation is performed. The winding tension is adjusted to maintain the mechanical peeling force during the separation of the polyester carrier film in a dynamically constant state. A preset physical peeling angle is controlled between the polyester carrier film and the label substrate's direction of travel. At room temperature, the polyester carrier film is directly driven to detach and move off the label substrate surface. This ensures that the release transfer layer, cholesteric liquid crystal layer, metal reflective layer, and interface resin underlayer remain intact on the label substrate surface due to the heterogeneity of their physical adhesion, forming a liquid crystal-digital composite anti-counterfeiting layer in a predetermined area.

[0059] Subsequently, a uniformly thick layer of liquid UV-curable wear-resistant varnish is applied to the surface of the composite anti-counterfeiting layer using a quantitative ink-carrying anilox roller. Finally, the varnish system is introduced into an ultraviolet radiation field to excite a cross-linking reaction, transforming it into a solid wear-resistant protective layer with a dense network cross-linked structure. Ultimately, a high-fidelity positioning cold-stamped liquid crystal phantom imaging anti-counterfeiting label is obtained under conditions that prevent thermal damage.

[0060] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A method for preparing a positioning hot stamping type liquid crystal holographic imaging anti-counterfeiting label, characterized in that, include: S1: Obtain a label substrate, print a basic graphic layer on the surface of the label substrate, and perform surface activation treatment on a predetermined hot stamping area of ​​the label substrate using corona discharge to construct a hot stamping adhesive receiving interface for enhancing the interfacial bonding strength of the hot stamping layer. S2: Obtain a phantom imaging film containing a cholesteric liquid crystal layer as a transfer carrier. Form an ink layer containing variable anti-counterfeiting character codes and matrix QR codes on the release transfer layer surface of the phantom imaging film using a piezoelectric digital inkjet printing process. Send the ink layer into a gradient temperature zone hot air drying assembly and dry and cure it at a temperature lower than the heat distortion temperature of the cholesteric liquid crystal layer to obtain a positioning hot stamping functional film. S3: The label substrate and the positioning hot stamping functional film are simultaneously fed into the positioning hot stamping unit with a photoelectric alignment system. The positioning target is identified and dynamically registered. The positioning hot stamping load is applied to the predetermined hot stamping area after stacking. The optical anti-counterfeiting layer of the positioning hot stamping functional film, together with the digital ink layer, is transferred and bonded to the hot stamping bonding receiving interface. S4: The hot-stamped label substrate is cured and shaped. The polyester carrier base film of the positioning hot-stamping functional film is peeled off. A liquid crystal-digital composite anti-counterfeiting layer is formed in the predetermined hot-stamping area of ​​the label substrate. A UV-curable wear-resistant varnish is coated on the surface of the composite anti-counterfeiting layer by micro-gravity roller coating. The varnish is then cross-linked and cured by UV irradiation to obtain a positioning hot-stamped liquid crystal phantom imaging anti-counterfeiting label.

2. The method according to claim 1, characterized in that, The surface activation process of the corona discharge treatment specifically includes: A localized directional plasma modification method is adopted, in which atmospheric pressure air plasma is applied to the predetermined hot stamping area, and the corona discharge treatment and the printing of the basic graphic layer are carried out sequentially along the material feeding direction. The processing speed and printing speed are dynamically synchronized and matched. The plasma action area is limited by the insulation shielding method, and the predetermined hot stamping area is surface activated and modified. The non-hot stamping area maintains its original surface physical state under the shielding state.

3. The method according to claim 1, characterized in that, The hot stamping adhesive receiving interface includes a hot melt adhesive receiving interface for positioning the hot stamping process and a UV cold stamping adhesive receiving interface for positioning the cold stamping process. A digital trajectory coating method is adopted, driving the coating head to perform continuous graphic trajectory movement along the geometric contour path of the predetermined hot stamping area, continuously coating liquid hot melt adhesive material inside the predetermined hot stamping area. After coating, the liquid hot melt adhesive performs self-leveling diffusion on the surface of the label substrate to form a uniform and flat bonding interface layer. The coating center position is adjusted in real time to align with the predetermined hot stamping area, and the outer periphery of the adhesive layer is aligned with the outer edge contour of the predetermined hot stamping area to obtain the hot melt adhesive receiving interface. Using a digital graphic coating or printing method, liquid UV cold foil adhesive material is continuously applied to the interior of the predetermined hot stamping area and leveled. The outer periphery of the adhesive layer is aligned with the outer edge contour of the predetermined hot stamping area to obtain the UV cold foil receiving interface.

4. The method according to claim 1, characterized in that, The transfer carrier is a multi-layered, stacked composite functional structure, comprising a layered structure and a transfer process: A release transfer layer is formed by coating and curing on the surface of a polyester carrier film; a cholesteric liquid crystal layer is formed by coating and oriented on the surface of the release transfer layer; a metal reflective layer with total internal reflection properties is deposited on the surface of the cholesteric liquid crystal layer to construct an optical interlocking structure. A surface adhesive layer or interface resin underlayer adapted to the hot stamping bonding receiving interface is coated on the surface of the metal reflective layer. During hot stamping transfer, the surface adhesive layer or interface resin underlayer is tightly bonded to the hot stamping adhesive receiving interface; during peeling, the release transfer layer separates from the polyester carrier base film at the interface, and the release transfer layer, cholesteric liquid crystal layer, metal reflective layer and surface adhesive layer or interface resin underlayer are retained on the surface of the label substrate as a whole, forming a complete transfer-type anti-counterfeiting functional layer.

5. The method according to claim 1, characterized in that, The process of forming the ink layer specifically includes: A variable digital code stream is acquired and transmitted to the printing control terminal to generate a printing dot matrix signal. During the printing alignment stage, the center coordinates of the hidden anti-counterfeiting pattern on the phantom imaging film are identified by optical scanning. The positional deviation between the center coordinates of the hidden anti-counterfeiting pattern and the preset printing baseline is calculated. The positional deviation is fed back to the printhead drive terminal to dynamically adjust the horizontal and vertical printing coordinates of the printhead. The printhead is controlled to spray ink droplets onto the surface of the release transfer layer to form the variable anti-counterfeiting character code and matrix QR code.

6. The method according to claim 1, characterized in that, The drying and curing of the ink layer specifically includes: Multiple continuously distributed drying sections with independently controlled heat input are arranged along the material feeding direction. Circulating hot air is sprayed onto the surface of the printed phantom imaging film within each drying section. The temperature control parameters of each drying section are configured according to the drying state of the ink layer. The feeding speed is adjusted to match the total length of the drying sections, driving the phantom imaging film with the ink layer to pass through each drying section sequentially for solvent removal and resin crosslinking. The drying temperature is controlled within a preset range below the heat distortion temperature of the liquid crystal layer to obtain a positioning hot stamping functional film.

7. The method according to claim 6, characterized in that, The positioning hot stamping functional film includes a hot stamping positioning hot stamping functional film and a cold stamping positioning hot stamping functional film: During the positioning hot stamping process, the transfer carrier is coated with a hot stamping adhesive layer with heat-sensitive bonding properties on the surface of the metal reflective layer to form a hot stamping positioning hot stamping functional film, which undergoes interfacial melting and bonding with the hot melt adhesive receiving interface under hot-press transfer state. During the positioning cold foil stamping process, the transfer carrier is coated with an interface resin underlayer having photosensitive bonding properties, pressure-sensitive bonding properties, or compatibility with external UV cold foil stamping adhesive on the surface of the metal reflective layer, forming a cold foil stamping positioning hot foil stamping functional film, which cures and bonds with the UV cold foil stamping adhesive receiving interface under cold pressure transfer state.

8. The method according to claim 1, characterized in that, The target identification process specifically includes: A cross-shaped positioning target is printed around the predetermined hot stamping area of ​​the label substrate, and a matching target is set at the corresponding position of the positioning hot stamping functional film. The positioning target image on the surface of the label substrate and the matching target image on the surface of the positioning hot stamping functional film are collected by photoelectric sensor probe, and the geometric edge feature information and center coordinate data of each image are extracted to complete the target recognition and reference positioning before hot stamping.

9. The method according to claim 1, characterized in that, The dynamic registration process specifically includes: During continuous production and conveying, the position signals of the positioning target and the alignment target are continuously collected, and the lateral and longitudinal misalignment between the current actual coordinates of the material and the target reference coordinates are calculated. The lateral and longitudinal misalignment are fed back to the control terminal in real time, and the material trajectory is adjusted to compensate for lateral displacement and adjust the gradient distribution of conveying tension to dynamically correct spatial misalignment. The response frequency of the control terminal is adjusted in real time according to the actual material speed, and the alignment correction rate is adjusted synchronously with the production speed to realize dynamic alignment control in continuous production.

10. The method according to claim 1, characterized in that, The curing and shaping process and peeling process specifically include: During the positioning hot stamping process, the label substrate, after being conveyed and hot-pressed, is sequentially cooled and shaped in sections through multiple preset temperature gradient cooling zones arranged along the material running trajectory. During the positioning cold foil stamping process, the label substrate, after being conveyed, cold-pressed, and cured by ultraviolet light, sequentially passes through the room temperature holding section along the material running trajectory for stable shaping; The peeling operation is performed at the cooling or stabilization termination position. The preset physical peeling angle is controlled between the polyester carrier base film and the label substrate in the direction of travel. The winding tension is adjusted to keep the mechanical peeling force during the separation process of the polyester carrier base film in a dynamic constant state. The polyester carrier base film is driven to detach and move out of the label substrate surface. The optical anti-counterfeiting layer and the digital ink layer are left on the label substrate surface as a whole.

11. The method according to claim 1, characterized in that, The formation process of the liquid crystal-digital composite anti-counterfeiting layer specifically includes: After peeling off the polyester carrier film, based on the relationship between liquid crystal molecule orientation and stacked physical structure, the reflective surface of the cholesteric liquid crystal layer is configured as a base layer that presents a color-dependent pattern; the anisotropic structure inside the cholesteric liquid crystal layer is configured as a polarized optical layer that demodulates and hides the pattern by polarized light transmission; the ink layer containing the variable anti-counterfeiting character code and matrix QR code is configured as a digital layer that responds to machine optical scanning to read feature data, so that the three functional structures of the base layer, the optical layer and the digital layer are kept in a stacked state to form the liquid crystal-digital composite anti-counterfeiting layer.

12. The method according to claim 1, characterized in that, The cross-linking and curing process specifically includes: The UV-curable wear-resistant varnish is quantitatively intercepted and transferred by microcavities on an anilox roller with a quantitative ink-carrying volume. The surface of the anilox roller carrying the varnish is controlled to form a reverse frictional contact with the label substrate, and a liquid varnish film layer of uniform thickness is coated on the surface of the liquid crystal-digital composite anti-counterfeiting layer. After coating, the label substrate is transported into a multi-segment UV irradiation zone. The photoinitiator in the varnish system is excited by UV light with gradient power to generate active components, triggering the polymerization and cross-linking reaction of the resin components to form a solid wear-resistant protective layer with a dense network cross-linked structure.

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