Preparation process of transfer paper and transfer paper

Abstract

The application discloses a preparation process of transfer paper and the transfer paper, and relates to the preparation process of the transfer paper and the preparation process of a freezing point medium transfer film; the preparation of the freezing point medium transfer film comprises the following steps: S1, coating release coating on the surface of a PET base film, and forming a release layer after drying and curing; S2, coating UV coating on the surface of the release layer, forming a UV layer with a pattern information area on the surface through UV mould pressing and UV light curing treatment; S3, vacuum evaporation of zinc sulfide on the surface of the pattern information area, and forming a zinc sulfide medium layer; S4, coating release coating on one side of the medium layer, and forming an isolation layer after drying and curing; and S5, obtaining the freezing point medium transfer film. In the processing process, the freezing point medium transfer film keeps PET base film avoiding areas on both sides in the width direction, when the isolation layer is coated, the isolation layer not only covers the surface of the medium layer, but also can be directly contacted with the PET base film, the edge of the medium layer is protected, and the yellowing speed is greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of laser paper technology, and more specifically, to a process for preparing transfer paper and the transfer paper itself. Background Technology

[0002] Ice-point dielectric transfer paper is a high-end aluminum-free holographic packaging material that achieves an ice-white mirror finish and soft iridescent effects through a zinc sulfide dielectric layer. It is widely used in high-end packaging fields such as cigarette packaging and cosmetics. The film making, storage, and paper lamination of this product are mostly segmented operations, often involving waiting periods between processes and cross-manufacturer processing. After the film roll is prepared, it usually needs to be stored statically, making it difficult to achieve immediate continuous lamination processing.

[0003] During the static storage of membrane rolls, on the one hand, residual water between the layers will be released, and the combined effect of small molecule migration will cause zinc sulfide to undergo hydrolysis and oxidation, resulting in irreversible endogenous yellowing. On the other hand, defects may occur where the middle of the membrane roll is normal but the edges are yellow. This will cause batches of membrane rolls to have different degrees of yellowing due to different storage times, resulting in large color differences and poor batch stability. Qualified membrane rolls are prone to failure and scrapping after storage, which restricts the large-scale and stable production of this type of product.

[0004] Existing processes sometimes involve coating a solvent-based isolation layer. However, during wet coating, the film layer easily absorbs and encapsulates internal moisture, which is difficult to completely remove using conventional drying methods. At the same time, the isolation layer can only protect the surface of the dielectric layer, leaving the edges of the dielectric layer exposed. External moisture can penetrate into the film from the edges, resulting in yellowing defects at the edges. Therefore, there is an urgent need to improve this process. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a preparation process and transfer paper for the transfer paper. During the processing of the ice-point medium transfer film, PET base film avoidance areas are retained on both sides of its width direction. When the isolation layer is coated, the isolation layer not only covers the surface of the medium layer, but also can directly contact the PET base film to protect the edge of the medium layer and greatly reduce its yellowing rate.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a process for preparing transfer paper, including a step of preparing an ice-point dielectric transfer film and a step of preparing ice-point dielectric transfer paper;

[0007] The preparation of the freezing point dielectric transfer membrane includes the following steps:

[0008] S1. Apply release coating to the surface of PET base film, and after drying and curing, form a release layer. The width of the release layer is smaller than the width of the PET base film so as to form a clearance area on both sides of the width of the PET base film.

[0009] S2. Apply UV coating to the surface of the release layer, and then perform UV molding and UV curing to form a UV layer with patterned information areas on the surface.

[0010] S3. Vacuum vapor deposition of zinc sulfide is performed on the surface of the pattern information area to form a zinc sulfide dielectric layer.

[0011] S4. Apply a release coating to one side of the dielectric layer, and after drying and curing, form an isolation layer. The isolation layer covers the surface of the dielectric layer and both sides in the width direction. The two sides of the isolation layer extend and are combined with the avoidance area of ​​the PET base film, so that the dielectric layer is completely wrapped between the isolation layer and the UV layer.

[0012] S5. Obtain the freezing point medium transfer membrane;

[0013] The preparation of freezing point medium transfer paper includes the following steps:

[0014] A1. Apply composite adhesive to the surface of the isolation layer of the freezing point medium transfer membrane to form an adhesive layer;

[0015] A2. Press the adhesive layer and the backing paper together.

[0016] A3. After the composite is completed, use an edge trimming device to perform edge trimming along the preset edge trimming line;

[0017] A4. Peel off the PET base film and release layer to obtain the freezing point medium transfer film.

[0018] Furthermore, after step S3, the coated film roll is sent into a constant temperature chamber for constant temperature feeding pretreatment at 55℃-60℃.

[0019] The pretreated film roll is then fed into a coating machine for coating the isolation layer. The residual heat carried by the film roll itself is used to initially cure the isolation layer on the side facing the medium layer.

[0020] Furthermore, the isolation layer is formed by applying two layers of isolation coating in stages, including the following sub-steps:

[0021] S4.1. Apply the first isolation coating to the surface of the medium layer using a coating machine, and dry and cure to form the first isolation layer. The first isolation layer covers the surface of the zinc sulfide medium layer and extends to the avoidance area of ​​the PET base film.

[0022] S4.2. Apply a second layer of isolation coating to the surface of the first isolation layer using a coating machine, and then dry and cure it to form the second isolation layer.

[0023] Furthermore, the dry film thickness of the first isolation layer ranges from 0.1 μm to 0.3 μm, and the dry film thickness of the second isolation layer ranges from 5 μm to 8 μm.

[0024] Furthermore, after the second isolation layer is coated, it undergoes multi-stage gradient drying. The oven is set with four temperature ranges, and the drying temperatures are as follows: the first range is 45℃-50℃, the second range is 55℃-60℃, the third range is 65℃, and the fourth range is 50℃-55℃. The film roll takes 45-60 seconds to pass through the oven.

[0025] Furthermore, the isolation layer, by weight percentage, consists of the following components: 22%-27% hydroxyl acrylic resin, 3%-5% all-alkyl surface-modified fumed silica, 4%-8% trimer polyisocyanate, 52%-63% mixed solvent, 1%-2% epoxy silane, 2%-3% TMPTA, and 0.4%-1% silicone-free additives.

[0026] Furthermore, the width of the avoidance zone ranges from 5mm to 10mm, and the width of the cut edge is greater than the width of the avoidance zone.

[0027] Furthermore, the thickness of the UV layer ranges from 6 micrometers to 8 micrometers, and the UV layer is composed of the following components by mass percentage:

[0028] Acrylic epoxy resin 15%-50%, acrylic resin 10%-20%, ethyl 2,4,6-trimethylbenzoylphenylphosphonate 2%-5%, NPGDA neopentyl glycol diacrylate 10%-30%, 1-hydroxycyclohexylphenyl ketone 1%-5%, silicone-free additives 1%-2%.

[0029] Furthermore, the isolation layer is coated with a ceramic anilox roller. The first isolation layer is coated with an anilox roller with 220-280 lines / in hexagonal cells at a coating speed of 15m / min-25m / min; the second isolation layer is coated with an anilox roller with 120-140 lines / in hexagonal cells at a coating speed of 10m / min-15m / min.

[0030] A transfer paper includes a base paper, an adhesive layer, a second release layer, a first release layer, a dielectric layer, and a UV layer, which are laminated from bottom to top, wherein the pattern information area is located on the side of the UV layer facing the dielectric layer.

[0031] In summary, the present invention has the following beneficial effects:

[0032] 1. After the isolation layer has cured, the zinc sulfide dielectric layer on the side facing the PET base film 1 is formed by the PET base film, release layer, and UV layer in sequence to create a protective barrier, preventing external moisture from penetrating the dielectric layer. On the other side of the dielectric layer away from the PET base film, the isolation layer provides direct protection. Simultaneously, utilizing the pre-reserved clearance areas on both sides of the PET base film, part of the coating of the isolation layer after curing is directly bonded to the PET substrate surface in the clearance areas. This seals and wraps the release layer, UV layer, and zinc sulfide dielectric layer on both sides in the width direction, leaving only the beginning and end of the film roll exposed. This minimizes the intrusion of external moisture into the film from the sides, solving the defect of exposed sides in traditional solutions and completely improving the phenomenon of preferential yellowing at the edges during storage of the freezing point dielectric transfer film.

[0033] 2. The second isolation layer has a larger film thickness, which can further enhance the overall water vapor barrier capability and form a secondary protection for the zinc sulfide medium layer. Since the first isolation layer, which has already been cured, already exists as a water barrier, the internal moisture contained in the second isolation layer will be blocked by the first isolation layer during the entire process of coating the second isolation layer and its drying and curing. It will not come into contact with or affect the zinc sulfide medium layer. At the same time, the multi-stage gradient drying process and low-temperature initial baking can prevent the wet film surface from forming a skin quickly, which is conducive to the gradual evaporation and discharge of solvents and moisture inside the coating, reducing the residual internal water inside the second isolation layer and improving the overall cross-linking and curing effect of the isolation layer. Attached Figure Description

[0034] Figure 1 This is a flowchart illustrating the preparation process of a freezing point medium transfer membrane.

[0035] Figure 2 This is a flowchart illustrating the preparation process of ice-point medium transfer paper.

[0036] Figure 3 This is a schematic diagram of the structure of a freezing point medium transfer membrane;

[0037] Figure 4 This is a schematic diagram of the cut edge after the base paper is laminated;

[0038] Figure 5 This is a schematic diagram of the structure of the freezing point composite transfer paper.

[0039] Reference numerals: 1. PET base film; 11. Avoidance area; 2. Release layer; 3. UV layer; 31. Pattern information area; 4. Dielectric layer; 5. First isolation layer; 6. Second isolation layer; 7. Adhesive layer; 8. Backing paper; 9. Cutting edge line; 100. Freezing point dielectric transfer film; 200. Freezing point dielectric transfer paper. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] like Figures 1-5 As shown, this embodiment discloses a process for preparing transfer paper, including the preparation steps of ice-point dielectric transfer film 100 and ice-point dielectric transfer paper 200;

[0042] Before manufacturing the freezing point dielectric transfer paper 200, it is necessary to first produce the freezing point dielectric transfer film 100, specifically, as follows: Figure 1 As shown, the preparation of the freezing point dielectric transfer membrane 100 includes the following steps:

[0043] S1. A release coating is applied to the surface of the PET base film 1, and after drying and curing, a release layer 2 is formed. The width of the release layer 2 is smaller than the width of the PET base film 1, so that a clearance area 11 not covered by the release layer 2 is formed on both sides of the width of the PET base film 1.

[0044] The PET base film 1 is a conventional 20-micron thick transparent base film. The formula and coating thickness of the release coating are conventional technologies. The PET base film 1 is a temporary carrier film. After the release coating is applied, it can be peeled off in the subsequent production of the freezing point medium transfer paper 200.

[0045] In the avoidance area 11, the PET base film 1 is directly exposed on the side facing the release layer 2. The width of the avoidance area 11 ranges from 5mm to 10mm, and is preferably 5mm in this embodiment. On the one hand, it provides a sealing and bonding position for the subsequent isolation layer, realizes the edge sealing and wrapping of the zinc sulfide dielectric layer 4, and solves the problem of water ingress and yellowing of the exposed edge of the dielectric layer 4. On the other hand, it can be used as a cutting positioning reference in the subsequent cutting process, which makes it easier for the equipment to identify the film width boundary and improve the cutting accuracy.

[0046] S2. Apply UV coating to the surface of the cured release layer 2, and then perform holographic UV molding to replicate the micro-grating pattern on the holographic plate into the uncured UV adhesive layer. After UV curing, a UV layer 3 with pattern information area 31 is formed.

[0047] The thickness of the UV layer 3 ranges from 6 micrometers to 8 micrometers. This thickness range ensures that the molding process can replicate a holographic microstructure of sufficient depth to guarantee the freezing point optical effect of the final product, while also ensuring that ultraviolet light can fully penetrate the film layer to achieve complete curing and avoid incomplete curing of the coating and the residue of a large number of small molecules.

[0048] UV layer 3 is composed of the following components by weight percentage:

[0049] Acrylic epoxy resin 15%-50%, acrylic resin 10%-20%, ethyl 2,4,6-trimethylbenzoylphenylphosphonate 2%-5%, NPGDA neopentyl glycol diacrylate 10%-30%, 1-hydroxycyclohexylphenyl ketone 1%-5%, silicone-free additives 1%-2%.

[0050] Conventional UV coatings often retain a significant number of small molecules, which migrate towards the zinc sulfide dielectric layer 4, accelerating its hydrolytic degradation. This UV coating formulation is optimized for the zinc sulfide dielectric layer 4 to minimize the residual migratable small molecules while maintaining holographic laser imaging effects. This improves the storage stability of the zinc sulfide dielectric layer 4 and alleviates the endogenous yellowing phenomenon that occurs during the static storage of the film roll. Specifically, this formulation uses ethyl 2,4,6-trimethylbenzoylphenylphosphonate and 1-hydroxycyclohexylphenyl ketone (184) for formulation. ethyl 2,4,6-trimethylbenzoylphenylphosphonate has a photobleaching effect and long-wave absorption, which is beneficial for deep curing of the coating. 1-hydroxycyclohexylphenyl ketone improves the surface oxygen inhibition problem and achieves thorough surface drying.

[0051] The synergistic effect of the two can reduce the residual amount of photoinitiator fragments and unreacted small molecules. The compound system is fully cured, reducing the amount of migratable small molecules, indirectly protecting the zinc sulfide dielectric layer 4, improving the storage stability of the film roll, and inhibiting endogenous yellowing.

[0052] S3. Zinc sulfide is deposited on the surface of the pattern information area 31 of the UV layer using a vacuum evaporation process to form a zinc sulfide dielectric layer 4. Vacuum evaporation of zinc sulfide is a mature existing technology in this field.

[0053] S4. Apply a release coating to one side of the dielectric layer 4, and after drying and curing, form an isolation layer. The isolation layer covers the surface of the dielectric layer 4 and both sides in the width direction. The two sides of the isolation layer extend and are combined with the avoidance area 11 of the PET base film 1, so that the dielectric layer 4 is completely wrapped between the isolation layer and the UV layer 3.

[0054] The isolation layer, by mass percentage, consists of the following components: 22%-27% hydroxyl acrylic resin, 3%-5% all-alkyl surface-modified fumed silica, 4%-8% trimer polyisocyanate, 52%-63% mixed solvent, 1%-2% epoxy silane, 2%-3% TMPTA, and 0.4%-1% silicone-free additives.

[0055] This isolation layer was specifically developed for the zinc sulfide dielectric layer 4, and it can provide highly efficient protection for the zinc sulfide dielectric layer 4. It can both inhibit the internal water source and block the intrusion of external water vapor, thus providing double protection for the zinc sulfide dielectric layer 4 from the inside out. This effectively improves the defects of the dielectric layer 4, such as hydrolysis and yellowing and unstable color difference, during the storage of the freezing point dielectric transfer membrane.

[0056] like Figure 3 As shown, after the isolation layer has cured, the zinc sulfide dielectric layer 4 facing the PET base film 1 forms a protective barrier composed of the PET base film 1, release layer 2, and UV layer 3, preventing external moisture from penetrating the dielectric layer. The other side of the dielectric layer 4, away from the PET base film 1, is directly protected by the isolation layer. Simultaneously, with the help of the clearance areas 11 reserved on both sides of the PET base film 1, part of the coating of the isolation layer after curing is directly bonded to the PET substrate surface of the clearance areas 11. This seals and wraps the release layer 2, UV layer 3, and zinc sulfide dielectric layer 4 along their width, leaving only the beginning and end of the film roll intact. This minimizes the intrusion of external moisture into the film from the sides, solving the defect of exposed sides in traditional solutions and completely improving the phenomenon of preferential yellowing at the edges during storage of the freezing point dielectric transfer film 100.

[0057] The isolation layer is formed by applying two layers of isolation coating in stages, including the following sub-steps:

[0058] S4.1. A first isolation coating is applied to the surface of the medium layer 4 using a coating machine, and then dried and cured to form a first isolation layer 5. The first isolation layer 5 covers the surface of the zinc sulfide medium layer 4 and extends to the avoidance area 11 of the PET base film 1. The first isolation layer 5 is coated using a ceramic anilox roller with 220-280 lines / in hexagonal cells at a coating speed of 15m / min-25m / min; preferably 20m / min. The thickness of the cured dry film is only 0.1μm-0.3μm. This first isolation layer 5 is an extremely thin pre-isolation coating with a fast curing reaction speed. During the subsequent wet coating operation of the second isolation coating, it can act as a barrier, effectively preventing moisture in the second wet coating system from penetrating into the zinc sulfide medium layer 4. At the same time, it can improve the problem that the curing speed of the coating surface is much faster than the curing speed of the inner layer near the medium layer 4 during the drying process, avoiding premature skinning of the coating surface to lock moisture inside the film layer, reducing the erosion of the zinc sulfide medium layer 4 by internal moisture, and significantly reducing the yellowing defect of the medium layer.

[0059] Furthermore, after step S3, the coated film roll is sent into a constant temperature chamber for pre-treatment at a constant temperature of 55℃-60℃. Then, the pre-treated film roll is sent to a coating machine for coating of the isolation layer. The residual heat carried by the film roll itself is used to achieve preliminary curing of the isolation layer on the side facing the dielectric layer 4. Specifically, through preheating treatment, the surface temperature of the film roll is maintained above 50℃ before coating the first isolation layer 5. After coating the first isolation layer 5, the residual heat of the film roll is used to preferentially cure the coating on the side close to the dielectric layer 4, further preventing the diffusion of internal moisture from the first isolation layer 5 to the zinc sulfide dielectric layer 4 and protecting the dielectric layer 4 from corrosion by internal moisture.

[0060] S4.2 After the first isolation layer 4 has cured, a second isolation coating is applied to the surface of the first isolation layer 5 using a coating machine, and then dried and cured to form the second isolation layer 6.

[0061] Specifically, the second isolation layer 6 is coated using a 120-140 line count / in hexagonal cell anilox roller at a coating speed of 10-15 m / min. The dry film thickness of the second isolation layer 6 is 5 μm-8 μm. After coating, the second isolation layer 6 undergoes multi-stage gradient drying. The oven is set with four temperature ranges: 45℃-50℃ (first stage), 55℃-60℃ (second stage), 65℃ (third stage), and 50℃-55℃ (fourth stage). The film roll passes through the oven for 45-60 seconds. The second isolation layer 6 has a relatively large film thickness, which can further improve… The overall water vapor barrier capability is enhanced, forming a secondary protection for the zinc sulfide dielectric layer 4. Since the first isolation layer 5, which has already been cured, exists as a water barrier, the internal moisture contained in the second isolation layer 6 will be blocked by the first isolation layer 5 during the coating and drying curing process, and will not come into contact with or affect the zinc sulfide dielectric layer 4. At the same time, the multi-stage gradient drying process and low-temperature initial baking can prevent rapid skin formation on the wet film surface, which is conducive to the gradual evaporation and discharge of solvents and moisture inside the coating, reducing the residual internal water inside the second isolation layer 6 and improving the overall cross-linking and curing effect of the isolation layer.

[0062] S5. After the second isolation layer 6 has cured, the following is obtained: Figure 3 The freezing point medium transfer membrane 100 is shown.

[0063] After the preparation of the freezing point dielectric transfer film 100 is completed, the subsequent process is carried out to laminate the freezing point dielectric transfer film 100 with the backing paper 8, finally obtaining the freezing point dielectric transfer paper 200. The specific steps include the following:

[0064] A1. A composite adhesive is applied to the surface of the isolation layer of the freezing point medium transfer film 100 to form an adhesive layer 7. Since the surface of the freezing point medium transfer film 100 is coated with an isolation layer, conventional composite adhesive is used in this embodiment. The adhesive layer 7 serves as an intermediate bonding layer for a firm bond between the isolation layer and the backing paper 8.

[0065] A2. The ice-point medium transfer film 100 with adhesive layer 7 is pressed and laminated with the backing paper 8, so that the adhesive layer 7 is sandwiched between the isolation layer and the backing paper 8, thus completing the preparation of the film-paper composite blank. This hot-pressing lamination method is a mature process in the field.

[0066] A3. After lamination, the edge cutting equipment is used to perform edge cutting along the preset edge cutting line 9. The avoidance area 11 reserved on both sides of the PET base film 1 plays the role of edge cutting and positioning in this process. The edge cutting width is greater than the width of the avoidance area 11. The edge cutting line is set inside the avoidance area 11. The avoidance area 11 and the excess edge of the isolation layer extending outward are completely cut off. The avoidance area 11 in the width direction is removed by edge cutting, thereby ensuring that the PET base film 1 can be completely peeled off.

[0067] A4. After the edge trimming is completed, the composite roll is peeled off, and the PET base film 1 and the release layer 2 on it are peeled off as a whole, finally obtaining the ice point medium transfer paper 200 with ice white mirror and iridescent laser effect.

[0068] like Figure 5 As shown, a transfer paper includes a base paper 8, an adhesive layer 7, a second isolation layer 6, a first isolation layer 5, a dielectric layer 4, and a UV layer 3, which are laminated from bottom to top. The pattern information area 31 is located on the side of the UV layer 3 facing the dielectric layer 4.

[0069] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A process for preparing transfer paper, characterized in that, This includes the preparation steps of the freezing point medium transfer film (100) and the preparation steps of the freezing point medium transfer paper (200); The preparation of the freezing point dielectric transfer membrane (100) includes the following steps: S1. A release coating is applied to the surface of the PET base film (1), and after drying and curing, a release layer (2) is formed. The width of the release layer (2) is smaller than the width of the PET base film (1) so that an avoidance area (11) is formed on both sides of the width of the PET base film (1). S2. Apply UV coating to the surface of the release layer (2), and then perform UV molding and UV curing to form a UV layer (3) with pattern information area (31) on the surface. S3. Vacuum vapor deposition of zinc sulfide is performed on the surface of the pattern information area (31) to form a zinc sulfide dielectric layer (4); S4. Apply release coating to one side of the medium layer (4), and after drying and curing, form an isolation layer. The isolation layer covers the surface of the medium layer (4) and both sides in the width direction. The two sides of the isolation layer extend and are combined with the avoidance area (11) of the PET base film (1), so that the medium layer (4) is completely wrapped between the isolation layer and the UV layer (3). S5. A freezing point medium transfer membrane (100) is prepared. The preparation of the freezing point medium transfer paper (200) includes the following steps: A1. Apply composite adhesive to the surface of the isolation layer of the freezing point medium transfer membrane (100) to form an adhesive layer (7); A2. Press the adhesive layer (7) and the backing paper (8) together; A3. After the composite is completed, the edge cutting equipment is used to perform edge cutting along the preset edge cutting line (9); A4. Peel off the PET base film (1) and release layer (2) to obtain the freezing point medium transfer film (100).

2. The preparation process of transfer paper according to claim 1, characterized in that, After step S3, the coated film roll is sent into a constant temperature chamber for constant temperature feeding pretreatment at 55℃-60℃. The pretreated film roll is then placed into a coating machine for coating of the isolation layer. The residual heat carried by the film roll itself is used to achieve preliminary curing of the isolation layer on the side facing the medium layer (4).

3. The preparation process of transfer paper according to claim 2, characterized in that, The isolation layer is formed by applying two layers of isolation coating in stages, including the following sub-steps: S4.

1. Apply the first isolation coating to the surface of the medium layer (4) using a coating machine, and dry and cure to form the first isolation layer (5). The first isolation layer (5) covers the surface of the zinc sulfide medium layer (4) and extends to the avoidance area (11) of the PET base film (1). S4.

2. Apply a second isolation coating to the surface of the first isolation layer (5) using a coating machine, and dry and cure to form the second isolation layer (6).

4. The process for preparing transfer paper according to claim 3, characterized in that, The dry film thickness of the first isolation layer (5) ranges from 0.1 μm to 0.3 μm, and the dry film thickness of the second isolation layer (6) ranges from 5 μm to 8 μm.

5. The preparation process of transfer paper according to claim 3, characterized in that, The second isolation layer (6) is subjected to multi-stage gradient drying after coating. The oven is set with four temperature ranges, and the drying temperatures are as follows: the first stage is 45℃-50℃, the second stage is 55℃-60℃, the third stage is 65℃, and the fourth stage is 50℃-55℃. The time for the film roll to pass through the oven is 45S-60S.

6. The process for preparing transfer paper according to claim 1, characterized in that, The isolation layer, by weight percentage, consists of the following components: 22%-27% hydroxyl acrylic resin, 3%-5% all-alkyl surface-modified fumed silica, 4%-8% trimer polyisocyanate, 52%-63% mixed solvent, 1%-2% epoxy silane, 2%-3% TMPTA, and 0.4%-1% silicone-free additives.

7. The process for preparing transfer paper according to claim 1, characterized in that, The width of the avoidance area (11) is 5mm-10mm, and the width of the cut edge is greater than the width of the avoidance area (11).

8. The process for preparing transfer paper according to claim 1, characterized in that, The thickness of the UV layer (3) ranges from 6 micrometers to 8 micrometers, and the UV layer (3) is composed of the following components by mass percentage: Acrylic epoxy resin 15%-50%, acrylic resin 10%-20%, ethyl 2,4,6-trimethylbenzoylphenylphosphonate 2%-5%, NPGDA neopentyl glycol diacrylate 10%-30%, 1-hydroxycyclohexylphenyl ketone 1%-5%, silicone-free additives 1%-2%.

9. The process for preparing transfer paper according to claim 3, characterized in that, The isolation layer is coated with a ceramic anilox roller. The first isolation layer (5) is coated with an anilox roller with 220-280 lines / in hexagonal cells at a coating speed of 15m / min-25m / min. The second isolation layer (6) is coated with an anilox roller with 120-140 lines / in hexagonal cells at a coating speed of 10m / min-15m / min.

10. A transfer paper according to claim 1, manufactured using the preparation process of a transfer paper according to any one of claims 1-9, characterized in that, It includes a base paper (8), an adhesive layer (7), a second isolation layer (6), a first isolation layer (5), a dielectric layer (4), and a UV layer (3) that are laminated from bottom to top. The pattern information area (31) is located on the side of the UV layer (3) facing the dielectric layer (4).

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