Thermal transfer film manufacturing method and thermal transfer film

Abstract

The invention discloses a thermal transfer film manufacturing method and a thermal transfer film. The method comprises the following steps: forming a release layer on a base film layer; a gold and silver edge is formed on the release layer through a digital printing process; printing patterns on the release layer on which the gold and silver edges are formed to form a pattern layer; and forming a glue layer on the pattern layer. According to the invention, the gold and silver edge modified with the gold edge and the pattern are directly printed on the heat transfer film and then are directly transferred to the product, so that the preparation steps are simplified, and the economic benefit is improved. The gold and silver edge for modifying the gold edge is formed by printing through a digital printing process, and an alumite material in a traditional gold stamping process is not needed, so that the gold and silver edge and printing ink are not mutually influenced, and the yield of gold stamping printing patterns is effectively improved. And meanwhile, the gold and silver edges are formed by printing through a digital printing process, so that additional working procedures of processing protection, temperature and pressure adjustment and the like are not needed, the production cost is effectively reduced, and the overall printing speed can be greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal transfer films, and in particular to a thermal transfer film manufacturing method and the thermal transfer film. Background Art

[0002] As people's requirements for product packaging continue to increase, in order to highlight the product theme, hot stamping is currently used on the market to achieve the inlay of gold edges on printed patterns, which is used to enhance the light perception, highlight the three-dimensional effect, express rich and delicate layering changes, and improve the appearance quality of the printed pattern. The process of printing first and then hot stamping is often used. Hot stamping is a post-printing process and is generally performed on flat materials such as printed materials such as book covers, real estate brochures, business cards, and packaging. However, for some curved or special-shaped surfaces that require hot stamping, the hot stamping plate needs to be made into a curved surface. Or for printed patterns with high fineness, the engraving accuracy of the hot stamping plate is required to be high, resulting in difficult plate making and low production efficiency. At the same time, during the hot stamping process, the gold foil is difficult to peel off, resulting in a rough surface that is not smooth and shiny, and forming defects such as bubbles and paste, which seriously affect the appearance quality of the product.

[0003] A unique hot stamping process has been developed, specifically one that involves hot stamping before printing. This process often results in the anodized aluminum being pulled back by the printing ink during hot stamping. This not only severely impacts the design but also significantly harms the printing equipment. This pulled-back anodized aluminum powder quickly accumulates on the blanket, causing image dot loss at best and partial image loss at worst. Furthermore, the anodized aluminum powder can transfer to the inking roller, accelerating roller wear and damaging the printing equipment. Consequently, this process can result in inaccurate or inaccurate hot stamping, difficulty removing the gold edge from the heat transfer film during the heat transfer process, and low yields.

[0004] In addition, to enhance the quality and quality of printed designs, hot stamping processes using heat and pressure, or cold stamping methods using UV adhesive to transfer the foil to the substrate, are commonly used to transfer the foil to the substrate surface. If the hot stamping is not strong enough, it is necessary to adjust the hot stamping temperature and pressure based on experience, or replace with suitable, high-quality, and highly adhesive hot stamping paper. Hot stamping is generally expensive. Cold stamping, on the other hand, often requires secondary processing such as lamination or varnishing, which increases production costs. Temperature and pressure must also be adjusted, and the hot stamping speed should be kept to a minimum. Both of these methods utilize hot stamping as a post-printing process, requiring trial stamping, proofreading, and final stamping. Only after the hot stamping process parameters are finalized can the correct positioning of the printed image be performed. Furthermore, it is important to ensure that the ink is completely dry before printing to prevent the ink layer from being pulled off, which complicates the process. Summary of the Invention

[0005] The embodiments of the present invention provide a method for manufacturing a heat transfer film and a heat transfer film to solve at least one of the problems in the prior art of low yield of hot stamping printing patterns, easy loss of image dots, impact on printing equipment, and slow printing speed.

[0006] According to a first aspect of the present invention, a method for manufacturing a thermal transfer film is provided, comprising:

[0007] forming a release layer on the base film layer;

[0008] The gold and silver edges are formed on the release layer through digital printing process;

[0009] Printing a pattern on the release layer with the gold and silver edges to form a pattern layer;

[0010] A glue layer is formed on the pattern layer.

[0011] The heat transfer film production method of the present invention simplifies the overall preparation steps and improves economic benefits by directly printing the gold and silver edges and patterns of the modified gold edges on the heat transfer film and then directly transferring them to the product. The gold and silver edges of the modified gold edges are formed by printing and printing using a digital printing process, without the need to use the electroplated aluminum materials used in the traditional hot stamping process, so they will not interact with the ink used when printing the pattern, effectively improving the yield of the hot stamping printed pattern. At the same time, because the gold and silver edges are formed by printing and printing using a digital printing process, compared with the traditional hot stamping process, there is no need for additional processing protection, temperature and pressure adjustment, etc., which effectively reduces production costs while significantly improving the overall printing speed, achieving continuous production, and the production speed can reach 70m / s.

[0012] In some embodiments, forming a release layer on the base film layer includes:

[0013] coating a wax mesh layer on the base film layer;

[0014] A release layer is formed on the wax mesh layer.

[0015] This arrangement prevents the entire thermal transfer film from falling off during transportation or handling, and allows for easier peeling during thermal transfer, making it more suitable for printing on irregularly shaped surfaces. When printing on irregularly shaped surfaces, the thermal transfer film with the wax mesh layer can be peeled off more evenly, improving the integrity and effectiveness of the pattern formed while also preventing premature peeling of the film during operation.

[0016] In some embodiments, the step of printing a pattern on the release layer having the gold and silver edges to form a pattern layer comprises:

[0017] Applying a wax mesh layer on the release layer formed with the gold and silver edges at the position where the pattern needs to be printed;

[0018] forming a release layer on the wax mesh layer;

[0019] A pattern is printed on the release layer to form a pattern layer, wherein the thickness of the gold and silver edges in the pattern layer is consistent with the total thickness of the wax mesh layer, the release layer and the pattern in the pattern layer.

[0020] Therefore, through such an arrangement, the gold and silver edges and the patterns in the manufactured thermal transfer film can each have a corresponding release layer, and then the corresponding viscosity can be set for the gold and silver edges and the pattern respectively, so that during use, the pattern and the gold and silver edges can be more easily separated from the release layer, avoiding the loss of the gold and silver edges or the pattern when the pattern and the gold and silver edges are separated by thermal transfer, so that the pattern can be transferred to the substrate more completely.

[0021] In some embodiments, the wax mesh layer has a thickness of 80-150 μm and is formed by coating with a mesh size of 200. The wax mesh layer is formed using carnauba wax.

[0022] Therefore, through such a setting, it is possible to avoid the influence of excessive thickness on the pattern effect after thermal transfer, and at the same time, it is also possible to effectively protect the entire thermal transfer film. Especially when transferring on a special-shaped surface, the thermal transfer film provided with a wax mesh layer can be peeled off more evenly, thereby improving the integrity and effect of the pattern formation, and at the same time, it can also prevent the thermal transfer film from falling off prematurely during operation.

[0023] In some embodiments, after forming the release layer, the method further comprises:

[0024] The structure after forming the release layer is UV cured.

[0025] Therefore, by such an arrangement, UV curing can be performed after forming the release layer, thereby effectively improving the weather resistance of the entire pattern.

[0026] In some embodiments, the glue layer is made of acrylic acid and a curing agent, and the curing agent includes one or more of active hydroxyl groups, acyloxy groups, silane groups, vinyl groups, amino groups, propenyl groups, methoxy groups, and the like.

[0027] Therefore, by such an arrangement, the initial adhesion to the surface to be loaded can be improved, and uniform adhesion to the irregular surface can be achieved.

[0028] In some embodiments, when the gold and silver edges are formed on the release layer by the digital printing process, a color mark is also formed;

[0029] When printing a pattern on the release layer with the gold and silver edges to form a pattern layer, the pattern is printed on the release layer with the gold and silver edges to form a pattern layer based on the positioning of the color mark by the color registration system.

[0030] Therefore, through such an arrangement, the color positions of each part of the pattern in the pattern layer can be aligned when forming the pattern layer using the color mark formed by digital printing, and can also be aligned with the position of the gold and silver edges, thereby improving the aesthetics of the overall thermal transfer film and reducing the width of the glue edge of the overall thermal transfer film.

[0031] According to a second aspect of the present invention, a thermal transfer film is provided, comprising a first base layer, a pattern layer and a glue layer arranged in sequence, wherein the first base layer comprises a base film layer and a release layer arranged in sequence, the pattern layer comprises gold and silver edges and a pattern, the pattern layer is arranged on the release layer, and the gold and silver edges are formed by a digital printing process.

[0032] The heat transfer film of the present invention directly prints the gold and silver edges and the pattern of the decorative gold edge onto the heat transfer film, forming an integrated heat transfer film that can then be directly transferred to the product. This simplifies the production process and improves economic efficiency. Compared with traditional products that are first hot-stamped and then printed, the processing steps are reduced, and the overall stability is improved, which can effectively improve the yield rate of hot-stamped printed patterns.

[0033] In some embodiments, the first base layer further includes a wax mesh layer disposed between the base film layer and the release layer.

[0034] This arrangement prevents the entire thermal transfer film from falling off during transportation and makes it easier to peel off during thermal transfer, making it more suitable for printing on irregular surfaces. When printing on irregular surfaces, the thermal transfer film with the wax mesh layer can be peeled off more evenly, improving the integrity and effectiveness of the pattern formed and preventing premature detachment of the thermal transfer film during operation.

[0035] In some embodiments, in the pattern layer, a release layer and a wax mesh layer are sequentially arranged between the pattern and the release layer in the first base layer, and the thickness of the gold and silver edge is consistent with the sum of the thicknesses of the wax mesh layer, the release layer, and the pattern in the pattern layer.

[0036] Therefore, through such an arrangement, the gold and silver edges and the patterns in the thermal transfer film can each have a corresponding release layer, and then the corresponding viscosity can be set for the gold and silver edges and the pattern respectively, so that during use, the pattern and the gold and silver edges can be more easily separated from the release layer, avoiding the loss of the gold and silver edges or the pattern when the pattern and the gold and silver edges are separated by thermal transfer, so that the pattern can be transferred more completely to the substrate.

[0037] In some embodiments, the wax mesh layer has a thickness of 80-150 μm and is formed by coating with a mesh size of 200. The wax mesh layer is formed using carnauba wax.

[0038] Therefore, through such a setting, it is possible to avoid the influence of excessive thickness on the pattern effect after thermal transfer, and at the same time, it is possible to effectively protect the entire thermal transfer film, so that it can be peeled off more evenly when transferring on a special-shaped surface, and at the same time avoid the thermal transfer film from falling off prematurely during operation.

[0039] In some embodiments, the glue layer is made of acrylic acid and a curing agent, and the curing agent includes one or more of active hydroxyl groups, acyloxy groups, silane groups, vinyl groups, amino groups, propenyl groups, methoxy groups, and the like.

[0040] Therefore, by such an arrangement, the initial adhesion to the surface to be loaded can be improved, and uniform adhesion to the irregular surface can be achieved.

[0041] In some embodiments, the release layer is configured to be UV-cured.

[0042] Therefore, by setting it in this way, the weather resistance of the entire pattern can be effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0044] Figure 1 This is a flow chart of a method for manufacturing a thermal transfer film according to one embodiment of the present invention;

[0045] Figure 2 This is a flow chart of step S11 of a method for manufacturing a thermal transfer film according to one embodiment of the present invention;

[0046] Figure 3 A flow chart of a method for manufacturing a thermal transfer film according to another embodiment of the present invention;

[0047] Figure 4 Flowchart of step S13 in the method for manufacturing a thermal transfer film according to one embodiment of the present invention;

[0048] Figure 5 A diagram showing the layer structure of a thermal transfer film according to one embodiment of the present invention;

[0049] Figure 6 A diagram showing the layer structure of a thermal transfer film according to another embodiment of the present invention;

[0050] Figure 7 A diagram showing the layer structure of a thermal transfer film according to another embodiment of the present invention;

[0051] Figure 8The left picture in the figure shows the surface state of the heat transfer film of the present invention after being tested by a dishwasher 30 times. Figure 8 The right picture shows the surface state of ordinary thermal transfer film after 30 times of dishwasher test.

[0052] Explanation of the accompanying reference numerals: 1. first base layer; 11. base film layer; 12. release layer; 13. wax mesh layer; 2. pattern layer; 21. gold and silver edges; 22. pattern; 3. glue layer. DETAILED DESCRIPTION

[0053] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0054] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0055] Finally, it should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include" and "comprise" include not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article or device. In the absence of further limitations, the elements defined by the phrase "include..." do not exclude the presence of other identical elements in the process, method, article or device that includes the elements.

[0056] The present invention will be further described in detail below with reference to the accompanying drawings.

[0057] Figure 1 The overall process of the method for producing a thermal transfer film according to one embodiment of the present invention is schematically shown. Figure 1 As shown, the method for manufacturing the thermal transfer film of the present invention comprises the following steps:

[0058] Step S11: forming a release layer on the base film layer;

[0059] Step S12: forming a gold and silver edge on the release layer by digital printing process;

[0060] Step S13: Printing a pattern on the release layer with the gold and silver edges to form a pattern layer;

[0061] Step S14: forming a glue layer on the pattern layer.

[0062] The base film layer serves as the substrate for the thermal transfer film, serving as the carrier for the release agent, ink, and adhesive coating. This carrier is required to be heat-resistant, pressure-resistant, and exhibit minimal tensile deformation. PET is typically used for this layer, as it offers excellent dimensional stability, uniform tension, heat resistance, and release properties. In step S11, a release layer is first formed on the base film layer. This can be prepared and formed using conventional processes, such as directly applying a release agent to the base film layer.

[0063] Reference Figure 2 As shown, in some other possible implementations, when forming the release layer on the base film layer, a wax mesh layer may be coated on the base film layer first. Specifically, Figure 2 The process flow of step S11 in the method for manufacturing a thermal transfer film according to one embodiment of the present invention is schematically shown. Figure 2 As shown, step S11 can be implemented as including the following steps:

[0064] Step S21: coating a wax mesh layer on the base film layer;

[0065] Step S22: forming a release layer on the wax mesh layer.

[0066] In the step flow of the overall step S11, in step S21, a wax mesh layer is first applied on the base film layer. The coating of the wax mesh layer makes the overall thermal transfer film formed not easy to fall off during transportation or operation, and can be more easily peeled off during thermal transfer. Specifically, the wax used in the wax mesh layer can be specifically carnauba wax, and its coating thickness can be set to 80-150 μm, and is set to 200 mesh coating to avoid the thickness of the wax mesh layer being too large. Such a design can avoid the wax mesh layer from being too thick and affecting the pattern effect after thermal transfer. The thin wax mesh layer formed can be similar to the gauze added when applying cement, making the thermal transfer film not easy to fall off from the base film layer during transportation, and can also become easy to peel off after being heated during thermal transfer, so as to effectively protect the overall thermal transfer film and make the thermal transfer film more suitable for transfer on special-shaped surfaces. Through the setting of the wax mesh layer, the overall thermal transfer film can also be more evenly peeled off when transferring on special-shaped surfaces, and also prevent the thermal transfer film from falling off early during operation. Thereafter, step S22 is performed to form a release layer on the coated wax mesh layer, thereby completing the process of step S11.

[0067] After the release layer is formed, you can proceed to the subsequent steps. Figure 3 As shown, Figure 3 The overall steps of the method for making a thermal transfer film according to another embodiment of the present invention are schematically shown. Figure 3As shown, in this embodiment, after completing step S11 to form the release layer, the following steps are also included:

[0068] Step S31: UV curing the structure after forming the release layer.

[0069] In step S31, UV curing of the structure after the release layer is formed can effectively improve the weather resistance of the pattern formed on the thermal transfer film. Specifically, the structure after the release layer is formed includes a base film layer, a wax mesh layer, and a release layer, and this part of the structure can be UV cured using an ultraviolet curing device.

[0070] After that, step S12 can be continued. In step S12, it is a step of forming gold and silver edges as decorative gold edges on the release layer. Specifically, in this step, when the gold and silver edges are formed on the release layer, they are formed on the release layer through a digital printing process. It is understandable that the gold and silver edges formed in step S12 are not a structure of a whole layer, but are only formed at the edge of the pattern to serve as decorative gold edges. Then, after completing step S12, the release layer will have gold and silver edges formed by the digital printing process, which does not require the use of electroplated aluminum materials, and therefore will not interact with the ink and pattern content used in the subsequent printing of the pattern, effectively improving the yield of the overall printed pattern. In addition, compared with the traditional hot stamping process, there is no need to perform additional processing protection, temperature and pressure adjustment and other processes. It is only necessary to arrange the corresponding digital printing equipment on the production line, which can effectively reduce production costs and effectively increase the overall printing speed to achieve continuous production.

[0071] In addition, in some possible embodiments, when forming the gold and silver edges on the release layer in step S12, a color mark may also be formed. The color mark may be placed at a corner to serve as a positioning reference for subsequent pattern printing, thereby improving the positional alignment of the colors of the various parts of the pattern layer in the final thermal transfer film, as well as the positional alignment between the pattern and the gold and silver edges, thereby improving the aesthetics of the overall thermal transfer film and reducing the width of the glue edge of the overall thermal transfer film.

[0072] After the gold and silver edges are formed, step S13 can be continued. In step S13, it is a step of printing a pattern on the release layer formed with the gold and silver edges to form a pattern layer. Specifically, in this step, the printed pattern can be specifically configured to be formed by gravure printing, or it can be configured to be formed by digital printing. Specifically in the present embodiment, the pattern is configured to be formed by gravure printing. Since the gold and silver edges are formed by a digital printing process, they will not interact with the pattern formed by gravure printing, nor will they affect the equipment for gravure printing. When printing the pattern, the printed pattern and the gold and silver edges do not overlap with each other, and the two are combined to form an overall pattern layer. In addition, in an embodiment in which a color mark is also formed in step S12, when performing step S13 to print the pattern to form the pattern layer, it can be configured to use a color matching system to print the pattern based on the color mark, so as to effectively improve the alignment of the color patterns of each part of the thermal transfer film formed, thereby improving the aesthetics of the thermal transfer film.

[0073] In some possible implementations, due to the varying adhesion between the printed pattern and the gold and silver foil, the base film, and the release layer, the ink pattern can easily peel off and transfer incompletely during the thermal transfer process, resulting in defects such as jagged edges and pattern breakage, affecting the integrity and quality of the finished pattern. This is especially true when thermally transferring to irregularly shaped surfaces, as these surfaces are more difficult to adhere to, making incomplete transfer and other quality issues more likely. Therefore, to address this issue, this embodiment further optimizes the thermal transfer film preparation method. Figure 4 The process flow of step S13 in the method for manufacturing a thermal transfer film according to one embodiment of the present invention is schematically shown. Figure 4 As shown, in this embodiment, when executing step S13, the steps may include:

[0074] Step S41: coating a wax mesh layer at a position where a pattern needs to be printed on the release layer formed with the gold and silver edges;

[0075] Step S42: forming a release layer on the wax mesh layer;

[0076] Step S43: Printing a pattern on the release layer to form a pattern layer, wherein the thickness of the gold and silver edges in the pattern layer is consistent with the total thickness of the wax mesh layer, the release layer, and the pattern in the pattern layer.

[0077] In this embodiment, when printing a pattern, a wax mesh layer and a release layer are further formed in sequence. Specifically, in the pattern layer after formation, the thickness of the gold and silver edges is consistent with the sum of the thicknesses of the wax mesh layer, the release layer, and the pattern in the pattern layer, so that the thickness of the entire pattern layer after formation is uniform. By setting it in this way, it can be ensured that during use, the thermal transfer film prepared can become easy to peel off after being heated during thermal transfer due to the characteristics of the wax mesh layer and the release layer, so as to effectively protect the entire thermal transfer film, especially when transferring to a special-shaped surface, it can be peeled off more evenly, so that the pattern layer and the gold and silver layers can be easily separated at the same time, and the pattern can be more completely transferred to the substrate. And during thermal transfer, after peeling off the release layer, such a design can make the gold and silver edges in the printed pattern have a certain protrusion, so that the printed pattern can have a more concave and convex feel.

[0078] After forming the pattern layer, step S14 is performed to form a glue layer on the pattern layer, completing the production of the thermal transfer film. The glue layer can be made of acrylic acid and a curing agent, including but not limited to one or more of active hydroxyl groups, acyloxy groups, silane groups, vinyl groups, amino groups, propenyl groups, and methoxy groups. This glue layer improves the initial adhesion of the formed thermal transfer film to the surface to be loaded, ensuring uniform adhesion to the irregularly shaped surface.

[0079] The method for producing a heat transfer film of the present invention simplifies the overall preparation steps and improves economic benefits by directly printing the gold and silver edges and the pattern layer of the modified gold edges on the heat transfer film, and then directly transferring it to the product. The gold and silver edges of the modified gold edges are formed by printing and printing through a digital printing process, without the need to use the electroplated aluminum material in the traditional hot stamping process, so that they will not interact with the ink used when printing the pattern, effectively improving the yield of the hot stamping printed pattern. At the same time, since the gold and silver edges are formed by printing and printing through a digital printing process, compared with the traditional hot stamping process, there is no need for additional processing protection, temperature and pressure adjustment and other processes, effectively reducing production costs. The overall production speed is greatly improved compared to the production speed of the process method of hot stamping first and then printing or printing first and then hot stamping in the prior art. The production speed of the process method of hot stamping first and then printing or printing first and then hot stamping in the prior art is generally about 20m / s. The production speed of the method of the present invention can reach 70m / s, which is a greatly improved production speed.

[0080] Figure 5 The structure of the thermal transfer film according to one embodiment of the present invention is schematically shown. Figure 5As shown, the thermal transfer film of the present invention includes a first base layer 1, a pattern layer 2, and a glue layer 3. The first base layer 1 includes a base film layer 11 and a release layer 12 arranged in sequence. The pattern layer 2 includes a gold and silver border 21 and a pattern 22. The pattern layer 2 is disposed on the release layer 12, and the gold and silver border 21 is formed on the release layer 12 by a digital printing process.

[0081] In some possible implementations, reference Figure 6 As shown, the first base layer 1 can also include a wax mesh layer 13 between the base film layer 11 and the release layer 12, wherein the wax used in the wax mesh layer 13 can specifically be carnauba wax, and its thickness is set to 80-150 μm, and is set to be formed by coating with 200 mesh. This is to avoid the thickness of the wax mesh layer 13 being too large. Such a design can avoid the wax mesh layer 13 being too thick and affecting the pattern effect after thermal transfer. The thin wax mesh layer 13 formed can be similar to the gauze added when applying cement, so that the thermal transfer film is not easy to fall off from the base film layer 11 during transportation or operation. At the same time, it can be easily peeled off during thermal transfer, and the overall thermal transfer film can be effectively protected, so that the thermal transfer film can be more suitable for transfer on special-shaped surfaces, and can be more evenly peeled off when transferring on special-shaped surfaces, while avoiding the thermal transfer film from falling off prematurely during operation.

[0082] Further, in some other possible implementations, referring to Figure 7 As shown, in the pattern layer 2, a release layer 12 and a wax mesh layer 13 may be disposed sequentially between the pattern 22 and the release layer 12 of the first base layer 1, with the thickness of the gold and silver border 21 being consistent with the sum of the thicknesses of the wax mesh layer 13, the release layer 12, and the pattern 22 in the pattern layer 2. Similarly, the wax mesh layer 13 may be carnauba wax, with a thickness of 80-150 μm and a 200 mesh coating. This arrangement ensures that the pattern 22 and the gold and silver border 21 can be easily separated during use of the thermal transfer film, ensuring complete transfer of the pattern to the substrate.

[0083] In addition, in some possible embodiments, the glue layer 4 can be configured to be made of acrylic acid and a curing agent, wherein the curing agent includes one or more of active hydroxyl groups, acyloxy groups, silane groups, vinyl groups, amino groups, propenyl groups, methoxy groups, etc., so as to improve the initial adhesion of the formed thermal transfer film to the surface to be loaded, and to evenly adhere to the special-shaped surface.

[0084] Meanwhile, in some possible implementations, the release layer 13 may be configured as a UV-cured structure, thereby effectively improving the weather resistance of the pattern formed on the thermal transfer film.

[0085] The heat transfer film of the present invention directly prints the gold and silver edges 21 and the pattern 22 of the gold edge decoration on the heat transfer film to form an integrated heat transfer film, and then directly transfers it to the product, which simplifies the preparation steps and improves economic benefits. Compared with the traditional products that are first hot-stamped and then printed, the processing steps are reduced, and the overall stability is high, which can effectively improve the yield rate of the hot stamping printing pattern. At the same time, referring to Figure 8 As shown, Figure 8 The surface state diagram of the heat transfer film of the present invention and the conventional heat transfer film after being tested in a dishwasher 30 times is schematically shown. Figure 8 The left picture in the figure shows the surface state of the heat transfer film of the present invention after being tested by a dishwasher 30 times. Figure 8 The right picture shows the surface state of ordinary thermal transfer film after 30 times of dishwasher test. Figure 8 It can be seen from the figure that the surface pattern of the heat transfer film of the present invention remains intact after being washed 30 times in a dishwasher, while the surface pattern of the ordinary heat transfer film is obviously lost after being washed 30 times in a dishwasher.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for producing a thermal transfer film, characterized in that: include: forming a release layer on the base film layer; The gold and silver edges are formed on the release layer through digital printing process; Printing a pattern on the release layer with the gold and silver edges to form a pattern layer; A glue layer is formed on the pattern layer.

2. The method according to claim 1, characterized in that The step of forming a release layer on the base film layer comprises: coating a wax mesh layer on the base film layer; A release layer is formed on the wax mesh layer.

3. The method according to claim 2, characterized in that The method of printing a pattern on the release layer having the gold and silver edges to form a pattern layer comprises: Applying a wax mesh layer on the release layer formed with the gold and silver edges at the position where the pattern needs to be printed; forming a release layer on the wax mesh layer; A pattern is printed on the release layer to form a pattern layer, wherein the thickness of the gold and silver edges in the pattern layer is consistent with the total thickness of the wax mesh layer, the release layer and the pattern in the pattern layer.

4. The method according to claim 2 or 3, characterized in that The wax mesh layer has a thickness of 80-150 μm and is formed by coating with a mesh size of 200. The wax mesh layer is formed by using carnauba wax.

5. The method according to any one of claims 1 to 3, characterized in that After forming the release layer, it also includes: The structure after forming the release layer is UV cured.

6. The method according to claim 1, characterized in that When the gold and silver edges are formed on the release layer by the digital printing process, a color mark is also formed on the release layer; When printing a pattern on the release layer with the gold and silver edges to form a pattern layer, the pattern is printed on the release layer with the gold and silver edges to form a pattern layer based on the positioning of the color mark by the color registration system.

7. A thermal transfer film, characterized in that: It includes a first base layer, a pattern layer and a glue layer arranged in sequence, wherein the first base layer includes a base film layer and a release layer arranged in sequence, the pattern layer includes gold and silver edges and a pattern, the pattern layer is arranged on the release layer, and the gold and silver edges are formed by a digital printing process.

8. The thermal transfer film according to claim 7, characterized in that In the pattern layer, a release layer and a wax mesh layer are sequentially arranged between the pattern and the release layer in the first base layer. The thickness of the gold and silver edge is consistent with the total thickness of the wax mesh layer, the release layer and the pattern in the pattern layer.

9. The thermal transfer film according to claim 7 or 8, characterized in that: The first base layer further includes a wax mesh layer disposed between the base film layer and the release layer. The wax mesh layer has a thickness of 80-150 μm and is formed by coating with a mesh size of 200. The wax mesh layer is formed using carnauba wax.

10. The thermal transfer film according to claim 7 or 8, characterized in that: The release layer is configured to be UV-cured.

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