Seamless laser carrier film, seamless laser film and preparation method and application thereof

Abstract

This invention relates to a seamless laser carrier film, a seamless laser film, its preparation method, and its application. The preparation method of the seamless laser film includes: S1. Composite a PE film and a PET film to obtain a composite base film; S2. Imprinting a laser pattern onto the PE film using a double-plate seamless molding machine, followed by vacuum deposition to form a dielectric layer, thus obtaining a seamless laser carrier film; S3. Coating the dielectric layer with an aqueous resin to form an aqueous protective layer, thus obtaining a seamless laser film. This invention, through the synergistic combination of the composite base film structure and special process steps, completely solves the industry pain point that conventional aluminum transfer technology still struggles to eliminate seams even with the application of infinitely cyclic nickel plates. The stress buffering capacity of the PE layer ensures the physical continuity of the molding structure, while the subsequent continuous deposition of the dielectric layer achieves seamless reconstruction of the optical surface. Together, these two processes eliminate periodic seam lines caused by substrate deformation, uneven release, or mechanical tolerances.

Description

Technical Field

[0001] This invention relates to the field of thin film technology, specifically to a seamless laser carrier film, a seamless laser film, its preparation method, and its application. Background Technology

[0002] Transfer foil technology, also known as electroplated aluminum foil hot stamping or foil transfer technology, is a surface finishing process widely used in printing, packaging, label making, and decorative materials. This process utilizes specific physical or chemical actions to peel the metallic aluminum layer and coloring layer from the carrier film of the electroplated aluminum foil and precisely transfer them to the surface of substrates such as paper, plastic, and leather, thereby giving the product excellent metallic luster, anti-counterfeiting functions, and a high-end visual effect. As consumers' demands for packaging appearance continue to rise, transfer foil technology has evolved from traditional localized embellishments to an important means of large-area full-page decoration and complex graphic presentation, becoming one of the key processes for enhancing product added value.

[0003] To address the need for mold recycling, existing technologies (such as Chinese patent CN112918145B) disclose a typical reusable UV transfer film. This technical solution comprises, from top to bottom, a PET base layer, a UV imaging information layer, a release layer, an aluminum layer, and an adhesive layer. Its core process involves: firstly, using gravure printing to coat the PET base layer with UV ink, followed by UV curing to form an imaging layer with a textured microstructure; then, a release layer, an aluminum plating layer, and an adhesive layer are sequentially prepared on the surface. During the thermal transfer process, the brittle fracture properties of the release layer allow the aluminum layer and adhesive layer to adhere to the paper, while the PET base film and UV imaging layer are retained for reuse.

[0004] However, based on the existing technological principles, its practical application faces the insurmountable technical challenge of large seams. Since this technology relies on gravure printing to construct the core imaging layer, the physical circumference of the printing roller inevitably results in periodic seams where the imaging pattern connects end to end. During subsequent metallization and transfer processes, these physical seams are precisely replicated and magnified, leading to aluminum leakage, overlap, or line breaks at the seams. Particularly in large-area full-print transfers aiming for a seamless visual effect, this structural seam inherent in the process severely disrupts the continuity and overall aesthetics of the holographic pattern, becoming a key bottleneck restricting the production of high-quality metallization transfer products. Summary of the Invention

[0005] Based on the above description, the present invention provides a seamless laser carrier film, a seamless laser film, a method for preparing the same, and its application, aiming to solve the problem of seams easily generated during the aluminum transfer process.

[0006] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: This invention provides a method for preparing a seamless laser film, comprising: S1. Composite film is obtained by laminating PE film and PET film; S2. After imprinting a laser pattern on the PE film, a dielectric layer is formed by vacuum deposition to obtain a seamless laser carrier film; S3. Coat the dielectric layer with an aqueous resin to form an aqueous protective layer, thereby obtaining a seamless laser film.

[0007] Furthermore, the surface dyne value of the PE film is not higher than 36, and the surface dyne value of the PET film is not lower than 52.

[0008] Furthermore, in step S1, the composite method is dry composite.

[0009] Furthermore, the thickness of the PE film is 10~20 μm, and the thickness of the PET film is 10~14 μm.

[0010] Furthermore, the thickness of the composite base film is 22~32 μm.

[0011] Furthermore, in step S2, aluminum is used as the coating material during vacuum coating, and the dielectric layer includes an aluminum layer.

[0012] The present invention also proposes a seamless laser carrier film, comprising the seamless laser carrier film prepared in step S2 by the aforementioned seamless laser film preparation method.

[0013] The present invention also proposes a seamless laser film, comprising a seamless laser film prepared according to the aforementioned method.

[0014] This invention also proposes the application of a seamless laser carrier film or seamless laser film in transfer printing, wherein the transfer printing method includes: S10. Coat the surface of the dielectric layer of the seamless laser carrier film with an aqueous resin to form an aqueous protective layer, thereby obtaining a seamless laser film; S20. Apply transfer adhesive to the water-based protective layer of the seamless laser film to form a transfer adhesive layer, and then bond one side of the transfer adhesive layer on the seamless laser film to the substrate to be transferred. S30. Separate the seamless laser carrier film to obtain a substrate with a laser pattern and a seamless laser carrier film; The seamless laser carrier film includes the seamless laser carrier film as described above or the seamless laser carrier film prepared in step S2 by the aforementioned seamless laser film preparation method. The seamless laser film includes the seamless laser film as described above or is prepared by the seamless laser film preparation method described above.

[0015] Furthermore, in the transfer method, after step S30, the method further includes: S40. Recover the seamless laser carrier membrane obtained in step S30, and repeat steps S10 to S30.

[0016] Compared with the prior art, the technical solution of this application has the following beneficial technical effects: 1. In the technical solution of the present invention, a base film is constructed by using a composite of PE film and PET film. The PET film provides excellent mechanical strength and dimensional stability, serving as a supporting skeleton to prevent the film from being stretched and deformed during high-speed production. The PE film, with its thermoplasticity and flexibility, exhibits excellent flow and filling capabilities during high-temperature and high-pressure molding. This composite structure can effectively absorb and buffer the mechanical stress and micro-deformation generated at the closing point of the molding roller. Combined with a double-platen seamless molding machine, the low dyne value of the PE film allows the medium layer and the PE layer to be completely separated, thus laying a solid foundation for eliminating seams from the perspective of the physical properties of the substrate and ensuring the continuity and integrity of the microstructure at the joint.

[0017] 2. This invention changes the traditional process sequence of first coating a release / color layer and then molding, or directly plating aluminum after molding. By first imprinting a laser pattern on a PE film, and then forming a continuous dielectric layer through vacuum coating, a dense and continuous dielectric layer is constructed on the surface of the imprinted microstructure. This effectively masks and repairs tiny breaks from an optical perspective, transforming the potential discontinuity of the physical structure into perfect continuity of optical performance, and blocking the visual presentation of seams on the final product.

[0018] 3. By combining the composite base film structure with special process steps, the industry pain point that conventional aluminum transfer technology still cannot eliminate seams even with the application of infinitely cyclic nickel plates has been completely solved. Among them, the stress buffering capacity of the PE layer ensures the physical continuity of the molding structure, while the continuous deposition of the subsequent dielectric layer realizes the seamless reconstruction of the optical surface. The two work together to eliminate the periodic seam lines caused by substrate deformation, uneven release, or mechanical tolerance. Attached Figure Description

[0019] Figure 1 A schematic flowchart of an embodiment of the method for preparing a seamless laser film provided by the present invention; Figure 2 A schematic diagram of a structure of an embodiment of the seamless laser carrier film provided by the present invention; Figure 3 A schematic diagram of a structure of an embodiment of the seamless laser film provided by the present invention; Figure 4 A schematic flowchart of another embodiment of the method for preparing a seamless laser film provided by the present invention; Figure 5 This is a physical image of the seamless laser film provided in Embodiment 1 of the present invention; Figure 6 This is a physical image of the laser film provided in Comparative Example 1 of this invention.

[0020] Explanation of icon numbers: 100. Seamless laser carrier film; 200. Seamless laser film; 1. PET film; 2. PE film; 3. Dry composite adhesive layer; 4. Dielectric layer; 5. Water-based protective layer; 6. Transfer adhesive layer; 7. Substrate to be transferred; 10. Nickel plate. Detailed Implementation

[0021] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0023] Existing aluminum transfer technology faces the insurmountable technical challenge of large seams in practical applications. Because this technology relies on gravure printing to construct the core imaging layer, the physical circumference of the printing roller inevitably results in periodic seams where the imaged pattern connects end to end. During subsequent aluminum plating and transfer processes, these physical seams are precisely replicated and magnified, leading to aluminum leakage, overlap, or line breaks at the seams. Particularly in large-area full-print transfers aiming for a seamless visual effect, this structural seam inherent in the process severely disrupts the continuity and overall aesthetics of the holographic pattern, becoming a key bottleneck restricting the production of high-quality aluminum transfer products.

[0024] In view of this, see Figure 1 This invention provides a method for preparing a seamless laser film 200, comprising: S1. Composite film is obtained by laminating PE film and PET film; S2. After imprinting a laser pattern on the PE film using a double-plate seamless molding machine, a medium layer 4 is formed by vacuum deposition to obtain a seamless laser carrier film 100. S3. Coat the dielectric layer 4 with an aqueous resin to form an aqueous protective layer 5, thereby obtaining a seamless laser film 200.

[0025] In the technical solution of this invention, a base film is constructed by using a composite of PE film and PET film. The PET film provides excellent mechanical strength and dimensional stability, serving as a supporting skeleton to prevent the film from stretching and deforming during high-speed production. The PE film, with its thermoplasticity and flexibility, exhibits excellent flow and filling capabilities during high-temperature and high-pressure molding. This composite structure can effectively absorb and buffer the mechanical stress and micro-deformation generated at the closing point of the molding roller. Combined with a double-platen seamless molding machine, the low dyne value of the PE film allows the medium layer and the PE layer to be completely separated, thus laying a solid foundation for eliminating seams from the perspective of the physical properties of the substrate and ensuring the continuity and integrity of the microstructure at the joint.

[0026] This invention changes the traditional process sequence of first coating a release / color layer and then molding, or directly plating aluminum after molding. By first imprinting a laser pattern on a PE film, and then forming a continuous dielectric layer 4 through vacuum deposition, a dense and continuous dielectric layer 4 is constructed on the surface of the imprinted microstructure. This effectively masks and repairs tiny breaks from an optical perspective, transforming the potential discontinuity of the physical structure into perfect continuity of optical performance, and blocking the visual presentation of seams on the final product.

[0027] By combining the composite base film structure with special process steps, the industry pain point that conventional aluminum transfer technology still cannot eliminate seams even with the application of infinitely cyclic nickel plates has been completely solved. Among them, the stress buffering capacity of the PE layer ensures the physical continuity of the molding structure, while the continuous deposition of the subsequent dielectric layer 4 achieves seamless reconstruction of the optical surface. The two work together to eliminate the periodic seam lines caused by substrate deformation, uneven release, or mechanical tolerance.

[0028] It should be noted that the method of imprinting the laser pattern in step S2 is not limited here. Specifically, in some embodiments of the present invention, the method of imprinting the laser pattern is to use a nickel plate 10 for imprinting. In order to avoid the generation of periodic seam lines, the nickel plate 10 is a double-roller nickel plate 10 with continuous cyclic patterns.

[0029] Furthermore, the surface dyne value of the PE film is not higher than 36, and the surface dyne value of the PET film is not lower than 52.

[0030] In the technical solution of this invention, by limiting the surface dyne value of the PE film to no higher than 36, this low surface energy characteristic can reduce the adhesion between the PE material and the nickel plate roller during the high temperature and high pressure molding process in step S2, so that the laser microstructure can be smoothly detached from the nickel plate after molding, effectively avoiding micro-grating stringing, breakage or collapse caused by sticking to the plate; by limiting the surface dyne value of the PET film to no lower than 52, it is ensured that the adhesive or hot melt layer can be fully spread and penetrate into the PET surface in the S1 composite process, forming a strong chemical bond and physical anchoring effect.

[0031] Furthermore, in step S1, the composite method is dry composite.

[0032] In the technical solution of this invention, a dry composite process is used to combine PE film and PET film to form a dry composite adhesive layer 3. This reduces the buffering loss of molding pressure by the dry composite adhesive layer 3 in subsequent processes, ensuring that molding energy is efficiently and uniformly transferred to the surface PE film. This guarantees high-fidelity replication of the micro-grating structure and pattern consistency at the seams. At the same time, the independent high-temperature drying tunnel system equipped with this process can control the amount of solvent residue at an extremely low level, avoiding the risk of microbubbles generated by solvent or moisture vaporization in subsequent high-temperature molding processes, which could damage the continuity of the laser pattern.

[0033] Furthermore, the thickness of the PE film is 10~20 μm, and the thickness of the PET film is 10~14 μm.

[0034] In the technical solution of this invention, a PE film of 10~20 μm is used. This specific range ensures that the PE layer can quickly respond to temperature changes during molding to achieve perfect replication, while having sufficient toughness to absorb mechanical impact at the seam without breaking. If it is too thin, it will result in insufficient heat capacity and poor melt flow, making it unable to completely fill the microstructure. If it is too thick, it will result in obvious thermal hysteresis effect, slow cooling and shaping, and easy generation of internal stress wrinkles. A PET film of 10~14 μm is used, which can effectively resist the high pressure closure of the molding roller to prevent excessive stretching and deformation of the base film, ensuring the seam alignment accuracy of the infinite cycle plate, and avoiding excessive curling radius and die-cutting difficulties caused by excessively thick substrate.

[0035] Furthermore, the thickness of the composite base film is 22~32 μm.

[0036] In the technical solution of the present invention, the thickness of the composite base film is controlled within the ultra-thin range of 22~32 μm, which significantly reduces the overall heat capacity of the composite film, improves the heating and cooling efficiency of the molding process, makes the crystallinity of the laser pattern more uniform under high-speed production, and completely eliminates the bright and dark lines at the seams caused by uneven thickness or thermal response differences.

[0037] Furthermore, in step S2, aluminum is used as the coating material during vacuum coating, and the dielectric layer 4 includes an aluminum layer.

[0038] In the technical solution of this invention, by using aluminum as the coating material for vacuum coating and making the dielectric layer 4 contain an aluminum layer, the excellent high reflectivity and low absorptivity of aluminum metal significantly improve the brightness and color saturation of the laser pattern, making the diffraction effect produced by the micro-grating structure sharper, clearer and with high contrast. At the same time, aluminum has excellent adaptability to vacuum evaporation process, with a moderate melting point and low latent heat of vaporization, which can achieve rapid and uniform deposition during high-speed winding coating process, and easily form dense, continuous and uniform nano-scale thin films, ensuring the continuity of conductivity and optical performance at seamless joints.

[0039] This invention also proposes a seamless laser carrier film 100, see reference. Figure 2 The seamless laser carrier film 100 prepared in step S2 is included in the preparation method of the seamless laser film 200 as described above.

[0040] Since the seamless laser carrier film 100 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0041] This invention also proposes a seamless laser film 200, see reference. Figure 3 This includes the seamless laser film 200 prepared according to the preparation method described above.

[0042] Since this seamless laser film 200 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be repeated here.

[0043] This invention also proposes the application of a seamless laser carrier film 100 or a seamless laser film 200 in transfer printing, see reference. Figure 4 The transfer method includes: S10. Aqueous resin is coated on the surface of the dielectric layer 4 of the seamless laser carrier film 100 to form an aqueous protective layer 5, thereby obtaining a seamless laser film 200. S20. Apply transfer adhesive to the substrate 7 to be transferred to form a transfer adhesive layer 6, and bond one side of the water-based protective layer 5 on the seamless laser film 200 to one side of the transfer adhesive layer 6 on the substrate 7 to be transferred. S30. Separate the seamless laser carrier film 100 to obtain a substrate with a laser pattern and the seamless laser carrier film 100; The seamless laser carrier film 100 includes the seamless laser carrier film 100 prepared in step S2 by the preparation method of the seamless laser film 200 as described above. The seamless laser film 200 includes the seamless laser film 200 as described above or is prepared by the preparation method of the seamless laser film 200 as described above.

[0044] In the technical solution of this invention, by constructing a double-layer interface bonding system of water-based protective layer 5 and transfer adhesive layer 6, the polar groups of water-based protective layer 5 can form a high-strength chemical bond and physical anchor with the transfer adhesive in step S20, ensuring the complete and precise peeling of the laser layer from the carrier film to the substrate 7 to be transferred during the transfer process; at the same time, the good flexibility of the water-based layer buffers the mechanical stress during the composite and separation process, making the ultra-thin seamless carrier film based on the aforementioned specific thickness and dry composite process less prone to stretching deformation or breakage during high-speed roll-to-roll transfer, so as to maintain the continuity of the pattern at the seam prepared by the infinitely cyclic nickel plate; after separation in step S30, the surface of the carrier film is clean and free of adhesive residue, and can be directly reused for the next round of molding and coating, which significantly reduces the cost of a single use of the expensive seamless nickel plate carrier; and the laser layer transferred to the substrate has excellent adhesion, abrasion resistance and solvent resistance due to the double protection of the water-based layer and the transfer adhesive.

[0045] Specifically, in some embodiments of the present invention, after step S30, a scratch-resistant coating is applied to the substrate with the laser pattern to form a scratch-resistant coating, thereby protecting the dielectric layer 4.

[0046] Furthermore, in the transfer method, after step S30, the method further includes: S40. Recover the seamless laser carrier membrane 100 obtained in step S30, and repeat steps S10 to S30.

[0047] In the technical solution of this invention, the seamless transparent film can be reused repeatedly by re-coating, coating a protective layer, and performing composite operations on the recycled transparent laser film, which greatly reduces the cost of raw materials and can theoretically be reused at least 4 times. This recycling process utilizes the excellent mechanical properties of the aforementioned PE / PET dry composite base film and the controllable peeling characteristics of the water-based protective layer 5 to ensure that the micro-grating structure on the surface of the seamless laser carrier film 100 remains intact and undamaged after multiple transfer processes, and the base film is not stretched or deformed. This ensures a high degree of consistency in the brightness, clarity, and seamless effect of the laser pattern at the seams in multiple batches of transfer products.

[0048] The technical solution of this patent will be further described in detail below with reference to specific embodiments.

[0049] Example 1 This embodiment provides a seamless laser film, the preparation method of which includes the following steps: 1. First, corona discharge is applied to one side of the biaxially oriented PET polyester film (such as Fuwei film) until the dyne value reaches ≥52. The general speed is 50-60m / min and the current is 6-8A. 2. On a coating machine (such as Guangdong Yuandong), the corona-treated side of the PET polyester film is laminated to one side of the PE base film (Ningbo Zhengjie) using a dry laminating adhesive (Xinhui Chemical FW402FK) to obtain a seamless laser carrier film. The typical speed is 90-110 m / min, the baking efficiency is 45-55%, and the adhesive layer thickness is controlled at 1.5-2 g / m. 3 ; 3. On a double-plate seamless molding machine (such as Sanjian), use a laser nickel plate to imprint holographic laser on the PE side of the seamless laser carrier film. The speed is generally 30-50 m / min, the temperature of the first plate is 120-135°C and the pressure is 50-70 kg, and the temperature of the second plate is 150°C and the pressure is 50-70 kg. 4. The carrier film with the laser pattern is coated with a dielectric layer (such as Haojun's aluminum wire or zinc sulfide) through a vacuum aluminizing equipment (such as Baodu). The speed is generally 5-10 m / s and the thickness is 400 μm. 5. Then, a protective layer (such as Hebei Zhisheng's WB-05) is coated onto the surface of the substrate layer using a coating machine (such as Far East) to obtain a seamless laser film. The typical speed is 100-110 m / min, and the baking efficiency is 50-66. 6. Then, using a laminating machine (Lisen), the seamless laser film and white cardboard (such as Hongmei) are bonded together with transfer adhesive (Huian XH-203A). The general speed is 100-120 m / min, and the drying efficiency is 55-65. 7. The carrier film is then peeled off and cut into standard sizes using a cross-cutting machine (Ruian). At the same time, the carrier film with laser effect is recycled for reuse. The speed is generally 150-200 m / min. Comparative Example 1 This comparative example provides a laser film, the preparation method of which includes the following steps: 1. First, corona discharge is applied to one side of the biaxially oriented PET polyester film (such as Fuwei film) until the dyne value reaches ≥52. The speed is generally 50-60 m / min and the current is 6-8A. Apply a chemical coating (such as Shanghai Bobang's PM-1) to the corona surface at a speed of 90-120 m / min, with a baking efficiency of 75-85. Using UV adhesive (such as Hebei Zhisheng's UV602) on a UV molding machine (such as Sanjian), the laser pattern on the nickel plate is imprinted onto the surface of the chemical layer, with a gap between 0.3-1 mm. The general speed is 30-50 m / min and the pressure is 4-6 kg. A dielectric layer (aluminum wire or zinc sulfide) is deposited on the carrier film with laser pattern through a vacuum aluminizing equipment, typically at a speed of 5-10 m / s and a thickness of 400 μm. Then, a protective layer (such as Hebei Zhisheng's WB-05) is applied to the surface of the medium layer using a coating machine (such as Far East) to obtain a laser film with a printing seam. The speed is generally 100-110 m / min and the baking efficiency is 50-66. Then, using a laminating machine (Lisen), the laser film with the printing seam and white cardboard (such as Hongmei) are bonded together with transfer adhesive (Huian XH-203A), generally at a speed of 100-120 m / min, with a baking efficiency of 55-65. The carrier membrane is then peeled off and cut into standard sizes using a cross-cutting machine (Ruian), typically at a speed of 150-200 m / min.

[0050] Physical images of the seamless laser films provided in Example 1 and Comparative Example 1 are shown below. Figure 5 and Figure 6 As shown, according to Figure 5 and Figure 6 It can be seen that the seamless laser film provided in Example 1 has no seams, while the seamless laser film provided in Comparative Example 1 has obvious seams.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0052] In summary, the technical solution of this application has the following beneficial technical effects: 1. In the technical solution of the present invention, a base film is constructed by using a composite of PE film and PET film. The PET film provides excellent mechanical strength and dimensional stability, serving as a supporting skeleton to prevent the film from being stretched and deformed during high-speed production. The PE film, with its thermoplasticity and flexibility, exhibits excellent flow and filling capabilities during high-temperature and high-pressure molding. This composite structure can effectively absorb and buffer the mechanical stress and micro-deformation generated at the closing point of the molding roller. Combined with a double-platen seamless molding machine, the low dyne value of the PE film allows the medium layer and the PE layer to be completely separated, thus laying a solid foundation for eliminating seams from the perspective of the physical properties of the substrate and ensuring the continuity and integrity of the microstructure at the joint.

[0053] 2. This invention changes the traditional process sequence of first coating a release / color layer and then molding, or directly plating aluminum after molding. By first imprinting a laser pattern on a PE film, and then forming a continuous dielectric layer through vacuum coating, a dense and continuous dielectric layer is constructed on the surface of the imprinted microstructure. This effectively masks and repairs tiny breaks from an optical perspective, transforming the potential discontinuity of the physical structure into perfect continuity of optical performance, and blocking the visual presentation of seams on the final product.

[0054] 3. By combining the composite base film structure with special process steps, the industry pain point that conventional aluminum transfer technology still cannot eliminate seams even with the application of infinitely cyclic nickel plates has been completely solved. Among them, the stress buffering capacity of the PE layer ensures the physical continuity of the molding structure, while the continuous deposition of the subsequent dielectric layer realizes the seamless reconstruction of the optical surface. The two work together to eliminate the periodic seam lines caused by substrate deformation, uneven release, or mechanical tolerance.

Claims

1. A method for manufacturing a seamless laser film, characterized by, The application relates to a seamless laser film and a preparation method thereof. S1. The PE film is compounded with a PET film to obtain a composite base film; S2. After a laser pattern is imprinted on the PE film by a double-plate seamless mold pressing machine, a medium layer is formed by vacuum coating to obtain a seamless laser carrier film; S3. A water-based protective layer is coated on the medium layer to obtain a seamless laser film.

2. The method of claim 1, wherein the laser film is a seamless laser film. The surface durometer value of the PE film is not higher than 36, and the surface durometer value of the PET film is not lower than 52.

3. The method of claim 1, wherein the laser film is a seamless laser film. In step S1, the compounding method is dry compounding.

4. The method of claim 1, wherein the laser film is a seamless laser film. The thickness of the PE film is 10-20 mu m, and the thickness of the PET film is 10-14 mu m.

5. The method of claim 1, wherein the laser film is a seamless laser film. The thickness of the composite base film is 22-32 mu m.

6. The method of claim 1, wherein the laser film is a seamless laser film. In step S2, aluminum is used as the coating material during vacuum coating, and the medium layer comprises an aluminum layer.

7. A seamless laser carrier film, characterized by, The seamless laser film prepared by the preparation method of the seamless laser film according to any one of claims 1-6.

8. A seamless laser film, characterized by, The seamless laser film prepared by the preparation method of the seamless laser film according to any one of claims 1-6.

9. Use of a seamless laser carrier film or a seamless laser film in transfer printing, characterized in that The transfer method comprises the following steps: S10. A water-based protective layer is coated on the medium layer of the seamless laser carrier film to obtain a seamless laser film; S20. Transfer adhesive is coated on the water-based protective layer of the seamless laser film to form a transfer adhesive layer, and one side of the transfer adhesive layer on the seamless laser film is compounded with a substrate to be transferred; S30. The seamless laser carrier film is separated to obtain a substrate with a laser pattern and a seamless laser carrier film; The seamless laser carrier film comprises the seamless laser carrier film according to claim 7 or the seamless laser carrier film prepared in step S2 of the preparation method of the seamless laser film according to any one of claims 1-6; The seamless laser film comprises the seamless laser film according to claim 8 or the seamless laser film prepared by the preparation method of the seamless laser film according to any one of claims 1-6.

10. Use according to claim 8, characterized in that, In the transfer method, the method further comprises the following steps after step S30: S40. The seamless laser carrier film obtained in step S30 is recycled, and steps S10-S30 are repeated.

Images