Metal plate multi-layer compounding method and metal plate

Abstract

The invention relates to the technical field of metal surface treatment processes, and discloses a metal plate multi-layer compounding method and a metal plate. The metal plate multi-layer compounding method comprises the following steps that at least two layers of ink are printed on the metal plate in a silk-screen printing mode to form an ink layer, at least two layers of printing ink are stacked, so that the surface of the metal plate has a concave-convex stereoscopic impression; carrying out high-temperature baking on the metal plate, so that the ink layer is completely dried; and transferring a floral pattern layer on the ink layer in a thermal transfer printing manner to form a required floral pattern effect. By adopting the process combination of silk-screen printing and heat transfer printing, the method has the advantages that the metal plate does not need to be heated by a fire gun, zero emission of CO2 is realized, no heavy metal substance is generated, no acid-alkali wastewater is generated, and products with small color difference and uniform texture patterns can be produced in batches.

Description

Technical Field

[0001] The present application relates to the technical field of metal surface treatment technology, and mainly to a multi-layer composite method of metal sheets and metal sheets. Background Art

[0002] The traditional process of aging metal sheets mainly includes three main steps: cleaning the surface of the metal sheets, making the hand-feel texture and making the surface pattern of the metal sheets.

[0003] In the process of cleaning the surface of metal sheets, steps such as degreasing, ceramicization, sealing, cleaning and drying are usually adopted. These cleaning steps will produce a large amount of acid and alkaline wastewater during the production process, and the water also contains a large amount of heavy metal substances. The whole process is not only seriously polluting, but also consumes a lot of energy.

[0004] In the process of making hand-feel texture, metal sheets are usually printed with screen and oil-based ink and dried, and then the metal sheets are quickly corroded with acidic solution to produce a concave-convex effect on the surface of the metal sheets. Subsequently, the metal sheets are washed with thinner to remove the silk-screen coating, and finally the metal sheets are washed again and dried. This production process also produces a large amount of acidic and alkaline wastewater and heavy metal substances, causing serious pollution to the environment.

[0005] In the process of making the surface pattern of the metal sheet, the metal sheet is first colored by electroplating or vacuum titanium plating. After coloring, an acidic blackening agent or greening agent (such as copper sulfate) is sprayed on the surface of the metal sheet, and the metal sheet is heated with a torch to quickly oxidize the metal surface to produce oxidized textures of different colors. After the texture is produced, the metal sheet is cleaned and lightly polished to remove the surface oxidized powder, then dried, and finally sprayed with protective paint. This production process not only requires the use of a torch, which produces carbon dioxide, but also in mass production, the resulting products are prone to color difference, and the texture pattern is difficult to unify, affecting the consistency and quality of the product.

[0006] In summary, the metal sheet aging process in the existing technology has the following major problems: it produces a large amount of acid and alkali wastewater and heavy metal pollutants, has high energy consumption and serious environmental pollution; the use of a torch for heating produces carbon dioxide, which is not environmentally friendly; there is color difference in products during mass production, and the texture pattern is difficult to unify, affecting product quality and consistency.

[0007] Therefore, the prior art still needs to be improved and developed. Summary of the invention

[0008] In view of the above-mentioned deficiencies in the prior art, the purpose of the present application is to provide a multi-layer composite method for metal sheets and metal sheets, which have simple and environmentally friendly processes and can be mass-produced to obtain products with small color differences and uniform texture patterns. This application aims to solve the problems of the existing metal sheet aging process that a large amount of corrosive solvents or heavy metal pollutants will be generated, and that products will have color differences during mass production and that it is difficult to unify texture patterns.

[0009] The technical solution of this application is as follows: A multilayer composite method of metal sheets comprises the following steps: At least two layers of ink are printed on the metal sheet by screen printing to form an ink layer, and at least two layers of the ink are stacked to make the surface of the metal sheet have a concave-convex three-dimensional effect; the present application uses screen printing to make the surface of the metal sheet have a concave-convex three-dimensional effect, without using corrosive solvents, and without generating a large amount of acidic and alkaline wastewater and heavy metal substances; Baking the metal sheet at high temperature to completely dry the ink layer; The pattern layer is transferred onto the ink layer by thermal transfer to form a desired pattern effect. The pattern effect can be various oxidation effects such as rust and copper rust, or can be natural stone texture, cloth texture, geometric pattern and the like.

[0010] The multi-layer composite method of metal sheet material, wherein before the step of printing at least two layers of ink on the metal sheet material by screen printing to form an ink layer, comprises the following steps: A primer is printed on the surface of the metal plate by screen printing to form a primer layer, and the primer layer is dried.

[0011] In the multi-layer composite method of metal sheet material, the process of surface drying of the primer coating is natural surface drying or heating to 100-200° C. to allow the primer coating to surface dry.

[0012] The multi-layer composite method of metal sheet material, wherein, before the step of printing the primer on the surface of the metal sheet material by screen printing to form the primer layer, further comprises the following steps: The surface of the metal plate is cleaned.

[0013] In the multi-layer composite method of metal sheet, the cleaning process is to wipe the metal sheet with a fruit acid cleaning agent. The fruit acid cleaning agent can evaporate naturally, and there is no need to clean the metal sheet multiple times, and no acid-base wastewater will be generated.

[0014] In the multi-layer composite method of metal sheet material, each layer of ink is printed using a screen with a different texture pattern, and each screen has a different mesh size.

[0015] The metal sheet multilayer composite method, wherein, after the step of printing at least two layers of ink on the metal sheet by screen printing to form an ink layer, further comprises the following steps: After the ink layer is dried on the surface, a layer of matte ink or glossy ink is applied by screen printing, and after the layer is dried on the surface, a rubber roller is used to roll the surface of the metal plate; The rolling pressure of the rubber roller is set to 0.5-1 MPa.

[0016] In the multi-layer composite method of metal sheets, the temperature of the high-temperature baking is 180-300°C.

[0017] A metal sheet, wherein the surface of the metal sheet is processed by the metal sheet multilayer composite method as described above.

[0018] The metal plate is an aluminum plate, an iron plate or a stainless steel plate.

[0019] Beneficial effects: The present application provides a multi-layer composite method for metal sheets, including steps such as printing ink layer, high temperature baking and thermal transfer pattern layer. By adopting a combination of screen printing and thermal transfer processes, it avoids the use of torch heating and acid solution corrosion, thereby solving the problem of generating a large amount of acid and alkali wastewater, heavy metal substances and CO in traditional processes. 2 The problem of CO emissions can be solved by heating the metal sheet without using a torch. 2 Zero emission, no heavy metal substances, no acid and alkaline wastewater, can be mass-produced to obtain products with small color difference and uniform texture pattern. In addition, it provides reliable technical support for large-scale industrial production and can be used for mass production of large-area metal decorative panels. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a rendering of the decorative aluminum plate in Example 1 of the present application.

[0021] Figure 2 This is a rendering of the bending point of the decorative aluminum plate after stamping and bending in Example 1 of the present application.

[0022] Figure 3 This is a rendering of the decorative aluminum plate in Example 2 of the present application.

[0023] Figure 4 This is a rendering of the decorative aluminum plate in Example 3 of the present application.

[0024] Figure 5 This is a rendering of the decorative aluminum plate in Example 4 of the present application.

[0025] Figure 6This is a rendering of the bending point of the decorative aluminum plate after stamping and bending in Example 4 of the present application. DETAILED DESCRIPTION

[0026] The present application provides a metal sheet multilayer composite method and a metal sheet. To make the purpose, technical solution and effect of the present application clearer and more specific, the present application is further described in detail below. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0027] With the widespread application of metal materials in architectural decoration, furniture manufacturing and other fields, the surface treatment technology of metal sheets continues to develop. Although the traditional aging process of metal sheets can achieve a variety of decorative effects, there are serious environmental pollution problems and process complexity. For example, the corrosive solvents used in the production process of hand-feel textures will produce a large amount of acid and alkali wastewater and heavy metal substances, which will cause environmental pollution; and in the process of making the surface pattern of metal sheets, torch heating will produce carbon dioxide emissions; the entire process is complicated and it is difficult to ensure the consistency of mass production.

[0028] The present application proposes a multilayer composite method of metal sheets, comprising the following steps: At least two layers of ink are printed on the metal sheet by screen printing to form an ink layer, and the surface of the metal sheet has a concave-convex three-dimensional effect by stacking at least two layers of ink; the present application uses screen printing to make the surface of the metal sheet have a concave-convex three-dimensional effect, without using corrosive solvents, and without generating a large amount of acidic and alkaline wastewater and heavy metal substances; Bake the metal sheet at high temperature to make the ink layer completely dry; The pattern layer is transferred onto the ink layer by heat transfer to form the desired pattern effect. The pattern effect can be various oxidation effects such as rust and copper rust, or it can be natural stone texture, cloth texture, geometric pattern and other effects.

[0029] In the face of environmental pollution and energy consumption problems in the aging process of metal sheets, how to achieve the concave-convex three-dimensional sense and pattern effect on the surface of the metal sheet while reducing environmental pollution and energy consumption is a key issue. This application solves the environmental pollution and energy consumption problems existing in the aging process of traditional metal sheets by adopting a new process combination, and at the same time achieves the concave-convex three-dimensional sense and pattern effect on the surface of the metal sheet. The concave-convex three-dimensional sense is achieved by forming an ink layer by screen printing, and the pattern is formed by thermal transfer, avoiding the method of using acid solution corrosion and gun heating, replacing the traditional high-energy consumption process, thereby reducing the generation of harmful substances and energy consumption, and avoiding the use of harmful substances. Through this method, this application not only solves the environmental pollution and energy consumption problems in traditional processes, but also improves the consistency of product quality. Since no acid solution is used in the entire process of making the hand texture and surface pattern, the generation of acid-base wastewater is greatly reduced. At the same time, due to the use of precise and controllable printing and transfer technology, the color difference and texture consistency of the product during mass production can be ensured to meet the needs of the high-end market. In addition, this method is also very flexible. By adjusting the thickness of the ink layer, the pattern and the thermal transfer pattern, a variety of metal sheet surface effects can be achieved to meet the personalized needs of different customers.

[0030] Furthermore, before the step of printing at least two layers of ink on the base coating layer by screen printing to form an ink layer, the following steps are included: The primer is printed on the surface of the metal plate by screen printing to form a base coat, and the base coat is left to dry.

[0031] In the present application, the primer layer is mainly used to improve the adhesion of the subsequent ink layer. Screen printing can accurately control the thickness and uniformity of the primer layer. The primer layer can choose different materials, such as epoxy resin or polyurethane resin, to adapt to different types of metal sheets and inks. The primer layer surface drying process can be natural surface drying or heated to 100-200°C to make the primer layer surface dry quickly. The surface drying is mainly to make the primer layer feel non-sticky. Natural surface drying can save energy costs, while heated surface drying can speed up production. The heating temperature of 100-200°C for heated surface drying can not only dry the surface quickly, but also will not damage the primer layer. The surface drying method can be selected according to the specific situation, while improving efficiency and taking into account cost and quality.

[0032] Furthermore, before the step of printing the primer on the surface of the metal plate to form the primer layer by screen printing, the following steps are also included: Clean the surface of the metal sheet to remove oil and impurities on the surface of the metal sheet.

[0033] The purpose of cleaning is to remove oil and impurities on the surface of the metal sheet, providing a clean foundation for subsequent printing and transfer processes. In this application, in order to avoid generating a large amount of acid-base wastewater, it is preferred to use a fruit acid cleaning agent to wipe the metal sheet to remove oil and impurities on the surface of the metal sheet. After wiping, the subsequent screen printing step can be carried out after the fruit acid cleaning agent evaporates naturally.

[0034] Specifically, the step of printing at least two layers of ink on the base coat by screen printing to form an ink layer is a key step to achieve a concave-convex three-dimensional effect. In this step, each layer of ink can be printed using a screen with different texture patterns, and each screen has a different mesh number, so that the formed ink layer has a different level of feel and three-dimensional effect. Specifically, using a screen with different texture patterns for printing can form a unique texture effect on each layer of ink, increasing the visual sense of hierarchy. Using screens with different mesh numbers can control the thickness and fineness of each layer of ink. A screen with a lower mesh number can print a thicker ink, while a screen with a higher mesh number can print a more delicate pattern. Through this multi-layer printing method, the ink layer finally formed can have a clear sense of hierarchy and three-dimensional sense in both vision and touch. Moreover, by accurately controlling the thickness and superposition method of each layer of ink, various three-dimensional effects from delicate texture to rough texture can be achieved, and the ideal product effect can be obtained by cooperating with subsequent patterns. Preferably, two to five layers of ink are printed on the base coat by screen printing to form an ink layer. The ink layer formed by two to five layers of ink is sufficient to meet the required different levels of feel and three-dimensional sense. Since the metal sheet will be grooved and bent during the subsequent processing, if there are too many layers of ink, the ink layer will be too thick, which will increase the risk of the ink layer falling off and cracking.

[0035] Further, after the step of printing at least two layers of ink on the metal sheet by screen printing to form an ink layer, preferably, the following steps are included: After the ink layer is dry, a layer of matte ink or glossy ink is applied by screen printing, and after it is dry, the surface of the metal plate is rolled with a rubber roller. The surface drying conditions of this step can be the same as the surface drying conditions of the aforementioned primer layer, as long as the surface is dry until the ink surface is not sticky.

[0036] In the present application, matte ink or glossy ink can also be printed according to the desired pattern effect to adjust the glossiness of the final product. This step makes the visual effect of the final product more realistic. For example, matte ink can reduce reflection, and a layer of matte ink can be applied to simulate rust or copper rust effects; while glossy ink can increase gloss, and a layer of glossy ink can be applied to simulate metallic glossy effects.

[0037] The surface of the metal sheet is rolled by a rubber roller, and the rolling treatment is performed after the ink layer and the special effect ink layer are dried, which can improve the flatness and uniformity of the surface. This step helps to eliminate the slight unevenness that may be produced during the screen printing process, so that the surface of the final product is smoother and more delicate while maintaining the concave and convex three-dimensional sense, improving the overall quality and touch, and also facilitating the subsequent transfer of the pattern layer for better adhesion. Further, the pressure of the rubber roller rolling can be set to 0.5-1MPa. The pressure of the rubber roller rolling is also adjusted according to the desired effect of the final product. For example, when the three-dimensional effect of the surface of the final product is an irregular concave and convex pattern, the pressure of the rubber roller rolling is appropriately reduced to make the height of the concave and convex pattern more random and natural; when the three-dimensional effect of the surface of the final product is a regular concave and convex pattern, the pressure of the rubber roller rolling is appropriately increased to keep the height of the concave and convex pattern as consistent as possible. Specifically, in the step of high-temperature baking of the metal sheet of the present application, the temperature of high-temperature baking is 180-300℃. The baking time is usually 15-30 minutes to ensure that the base coat and ink layer are completely dry and form a stable structure. This step not only solidifies the coating, but also enhances the bonding strength between the ink layer and the metal sheet.

[0038] Specifically, the last step is to transfer the pattern layer onto the ink layer by thermal transfer. Thermal transfer technology can achieve a variety of pattern effects, such as oxidation effects such as rust and copper rust, or natural stone texture, cloth texture, geometric patterns and other effects. The temperature and pressure of thermal transfer can be adjusted according to the specific transfer material, usually at a temperature of 160-200°C and a pressure of 0.3-0.6MPa. The color and details of the pattern can be precisely controlled by thermal transfer to ensure consistency during mass production.

[0039] The metal sheet multilayer composite method of the present application not only solves the existing problem of using a large amount of corrosive solvents or producing a large amount of heavy metal pollutants, but also improves the consistency of product quality. Since the whole process does not have traditional corrosion, electroplating, oxidation coloring and other steps, the generation of wastewater and harmful gases is greatly reduced. At the same time, due to the use of precise and controllable screen printing and thermal transfer technology, not only the production efficiency is improved, but also the consistency and repeatability of product quality during mass production can be ensured, the needs of the high-end market are met, the consistency and repeatability of product quality are ensured, and reliable technical support is provided for large-scale industrial production, which can be used for mass production of large-area metal decorative sheets. In addition, the flexibility of this method is also very high. By adjusting the three-dimensional effect of the ink layer and the pattern of the thermal transfer, a variety of metal sheet surface effects can be achieved to meet the personalized needs of different customers.

[0040] The present application also provides a metal plate, the surface of which is treated by the above-mentioned metal plate multilayer composite method, and the surface of which is sequentially attached with a primer layer, an ink layer and a pattern layer. The metal plate can be an aluminum plate, an iron plate, a stainless steel plate, etc.

[0041] The metal sheet multilayer composite method of the present application has the following advantages: (1) No acidic or alkaline reagents are required in the production process, which eliminates the generation of wastewater and eliminates the need for torch heating. 2 Zero emissions, no heavy metals produced, etc.

[0042] (2) The production process is simple, efficient and low-cost.

[0043] (3) There is little color difference in mass production, and the texture pattern can be unified or personalized.

[0044] (4) It can truly restore the three-dimensional texture of various metal textures, marble and other types of stone materials, and will not cause oxidation dust to fall off (the rust and copper rust oxidation textures prepared by traditional technology will have the phenomenon of dust detachment).

[0045] (5) Screen printing can replace most metal sheet etching processes to produce a concave and convex feel, and can produce ideal metallic color and metallic feel on the metal surface without the need for electroplating or vacuum titanium plating.

[0046] (6) The finished product can be grooved and bent without cracking the texture pattern. Even if the finished product is laser cut or cut with a knife, the texture pattern will not fall off or crack. The finished product can adapt to the current processing technology on the market. The surface hardness of the finished product reaches 3H-4H, the salt spray test has passed more than 1000 hours, and the 100-grid test will not fall off.

[0047] (7) This application is an environmentally friendly antioxidant process.

[0048] (8) This application can be used to produce metal decorative panels on a large scale.

[0049] (9) The aluminum plate, iron plate, and stainless steel plate produced by the metal plate multilayer composite method of this application have exquisite patterns and are wear-resistant. The coating does not crack or fall off after 180° bending (0T), and the texture has a concave-convex feel.

[0050] The present application is further described below through specific implementation methods.

[0051] In the embodiment scheme, the fruit acid cleaning agent is a blue peacock mold cleaning agent purchased from Dongguan Sai Ya, the screen printing primer is purchased from Fantas, the screen printing ink is purchased from Dongguan Shichuangli, and the thermal transfer paper used is the thermal transfer paper sold by the applicant. It should be noted that there is no special limitation on the cleaning agent, primer, ink, and thermal transfer paper / film, and the commercially available goods suitable for metal sheets can be used. The goods used in the embodiments of the present application are only used to explain the present application and are not used to limit the present application.

[0052] Example 1 Take an aluminum plate and wipe the surface of the aluminum plate with a fruit acid cleaner to remove oil and impurities on the surface.

[0053] After the fruit acid cleaning agent evaporates naturally, use a 300-mesh screen to print the primer on the surface of the aluminum plate by screen printing to form a primer layer with a thickness of about 10 microns. Heat it to 200°C to make the primer layer dry and not sticky to the touch.

[0054] Three layers of ink with different patterns are printed using three layers of screen printing, which are 250 mesh, 200 mesh and 300 mesh screens respectively. The three layers of ink with different patterns are stacked to form a concave and convex three-dimensional rust texture ink layer, and the total thickness of the ink layer is about 30 microns.

[0055] After the ink layer is dry, a layer of matte ink is printed with a 300-mesh screen with a thickness of about 10 microns. It is heated to 200°C and dried. After the ink surface is no longer sticky, the surface of the aluminum plate is rolled with a rubber roller with a pressure of 0.5 MPa.

[0056] After screen printing is completed, the aluminum plate is placed in an oven at 200°C for 20 minutes to completely dry the primer and ink layers.

[0057] Finally, the rust effect pattern is transferred onto the ink layer using thermal transfer technology. The transfer temperature is set to 180°C, the pressure is 0.4MPa, and the time is 30 seconds. After cooling, a decorative aluminum plate with a concave-convex three-dimensional sense and a realistic rust effect is obtained.

[0058] Figure 1 This is the rendering of the decorative aluminum plate. You can see that the surface has a strong three-dimensional sense, the metal color is realistic, and the metallic feel is strong. Figure 2 This is the effect picture of the bending part of the finished product after stamping and bending. Figure 2 It can be seen that the texture pattern on the surface did not fall off or crack after bending. The finished product was tested for performance, and the surface hardness reached 3H, the salt spray test passed for more than 1000 hours, and the 100-grid test did not fall off.

[0059] Example 2 Take an aluminum plate and wipe the surface of the aluminum plate with a fruit acid cleaner to remove oil and impurities on the surface.

[0060] After the fruit acid cleaning agent evaporates naturally, use a 300-mesh screen to print the primer on the surface of the aluminum plate by screen printing to form a primer layer with a thickness of about 10 microns. Heat it to 200°C to make the primer layer dry and not sticky to the touch.

[0061] Two layers of ink with different patterns are printed using three layers of screen printing, with screens of 250 mesh and 200 mesh respectively. The two layers of ink with different patterns are stacked together to form a concave and convex three-dimensional leaf texture ink layer, and the total thickness of the ink layer is about 20 microns.

[0062] After the ink layer is dry, a layer of matte ink is printed with a 300-mesh screen with a thickness of about 10 microns. It is heated to 200°C and dried. After the ink surface is no longer sticky, the surface of the aluminum plate is rolled with a rubber roller with a pressure of 1 MPa.

[0063] After screen printing is completed, the aluminum plate is placed in an oven at 200°C for 20 minutes to completely dry the primer and ink layers.

[0064] Finally, the pattern of colored leaves was transferred onto the ink layer using thermal transfer technology. The transfer temperature was set to 180°C, the pressure was 0.4MPa, and the time was 30 seconds. After cooling, a decorative aluminum plate with a concave-convex three-dimensional effect and colored leaves was obtained.

[0065] Figure 3 This is the effect picture of the decorative aluminum plate. It can be seen that the surface has a strong three-dimensional sense and the leaf texture is clear. Figure 3 It can also be seen that the texture pattern on the edge of the finished product after being cut by the knife did not fall off or crack. The finished product was tested for performance, and the surface hardness of the finished product reached 4H, the salt spray test passed more than 1000 hours, and the 100-grid test did not fall off.

[0066] Example 3 Take an aluminum plate and wipe the surface of the aluminum plate with a fruit acid cleaner to remove oil and impurities on the surface.

[0067] After the fruit acid cleaning agent evaporates naturally, use a 300-mesh screen to print the primer on the surface of the aluminum plate by screen printing to form a primer layer with a thickness of about 10 microns. Heat it to 200°C to make the primer layer dry and not sticky to the touch.

[0068] Three layers of ink with different patterns are printed using three layers of screen printing, which are 250 mesh, 200 mesh and 300 mesh screens respectively. The three layers of ink with different patterns are stacked to form a concave and convex copper rust texture ink layer. The total thickness of the ink layer is about 30 microns.

[0069] After the ink layer is dry, a layer of matte ink is printed with a 300-mesh screen with a thickness of about 10 microns. It is heated to 200°C and dried. After the ink surface is no longer sticky, the surface of the aluminum plate is rolled with a rubber roller with a pressure of 0.5 MPa.

[0070] After screen printing is completed, the aluminum plate is placed in an oven at 200°C for 20 minutes to completely dry the primer and ink layers.

[0071] Finally, the pattern of copper rust effect is transferred on the ink layer by thermal transfer technology. The transfer temperature is set to 180℃, the pressure is 0.4MPa, and the time is 30 seconds. After cooling, a decorative aluminum plate with concave-convex three-dimensional sense and realistic copper rust effect is obtained.

[0072] Figure 4 The effect picture of the decorative aluminum plate shows that the surface has a strong three-dimensional sense, the metal color is realistic and the metal sense is strong. The finished product is tested for performance, and the surface hardness of the finished product reaches 3H, the salt spray test passes more than 1000 hours, and the 100-grid test will not fall off.

[0073] Example 4 Take an aluminum plate and wipe the surface of the aluminum plate with a fruit acid cleaner to remove oil and impurities on the surface.

[0074] After the fruit acid cleaning agent evaporates naturally, use a 300-mesh screen to print the primer on the surface of the aluminum plate by screen printing to form a primer layer with a thickness of about 10 microns. Heat it to 200°C to make the primer layer dry and not sticky to the touch.

[0075] Two layers of ink with different patterns are printed using three layers of screen printing, which are 250 mesh and 300 mesh screens respectively. The two layers of ink with different patterns are stacked together to form a concave and convex three-dimensional woven rattan texture ink layer. The total thickness of the ink layer is about 20 microns.

[0076] After the ink layer is dry, a layer of glossy ink is printed with a 300-mesh screen with a thickness of about 10 microns. It is heated to 200°C and dried. After the ink surface is no longer sticky, the surface of the aluminum plate is rolled with a rubber roller with a pressure of 1 MPa.

[0077] After screen printing is completed, the aluminum plate is placed in an oven at 200°C for 20 minutes to completely dry the primer and ink layers.

[0078] Finally, the pattern of woven rattan effect is transferred on the ink layer by thermal transfer technology. The transfer temperature is set to 180℃, the pressure is 0.4MPa, and the time is 30 seconds. After cooling, a decorative aluminum plate with concave-convex three-dimensional sense and realistic woven rattan effect is obtained.

[0079] Figure 5This is the rendering of the decorative aluminum plate. You can see that the surface has a strong three-dimensional sense and the woven rattan effect is realistic. Figure 6 This is the effect of the bending part after the finished product is stamped and bent. Figure 6 It can be seen that the texture pattern on the surface did not fall off or crack after bending. The finished product was tested for performance, and the surface hardness reached 4H, the salt spray test passed for more than 1000 hours, and the 100-grid test did not fall off.

[0080] It should be understood that the application of the present application is not limited to the above examples. For ordinary technicians in this field, improvements or changes can be made according to the above description, and all these improvements and changes should fall within the scope of protection of the present application.

Claims

1. A multi-layer composite method of metal sheets, characterized in that: The following steps are involved: Printing at least two layers of ink on the metal sheet by screen printing to form an ink layer, and stacking at least two layers of the ink to give the metal sheet a concave-convex three-dimensional effect; Baking the metal sheet at high temperature to completely dry the ink layer; The texture pattern layer is transferred onto the ink layer by thermal transfer.

2. The metal sheet multilayer composite method according to claim 1, characterized in that: Before performing the step of printing at least two layers of ink on the metal sheet to form an ink layer by screen printing, the following steps are included: A primer is printed on the surface of the metal plate by screen printing to form a primer layer, and the primer layer is dried.

3. The metal sheet multilayer composite method according to claim 2, characterized in that: The process of surface drying the primer layer is natural surface drying or heating to 100-200° C. to allow the primer layer to surface dry.

4. The metal sheet multilayer composite method according to claim 2, characterized in that: Before performing the step of printing the primer on the surface of the metal sheet to form a primer layer by screen printing, the following steps are also included: The surface of the metal plate is cleaned.

5. The metal sheet multilayer composite method according to claim 4, characterized in that: The cleaning process is to wipe the metal plate with a fruit acid cleaning agent.

6. The metal sheet multilayer composite method according to claim 1, characterized in that: Each layer of the ink is printed using a screen with a different texture pattern, and each screen has a different mesh count.

7. The metal sheet multilayer composite method according to claim 1, characterized in that: After the step of printing at least two layers of ink on the metal sheet by screen printing to form an ink layer, the following steps are also included: After the ink layer is dried on the surface, a layer of matte ink or glossy ink is applied by screen printing, and after the layer is dried on the surface, a rubber roller is used to roll the surface of the metal plate; The rolling pressure of the rubber roller is set to 0.5-1 MPa.

8. The metal sheet multilayer composite method according to claim 1, characterized in that: The high temperature baking temperature is 180-300°C.

9. A metal sheet, characterized in that: The surface of the metal sheet is treated by the metal sheet multilayer composite method as described in any one of claims 1 to 8.

10. The metal sheet according to claim 9, characterized in that: The metal plate is an aluminum plate, an iron plate or a stainless steel plate.

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