Composite layer metal plate and manufacturing method thereof

Abstract

The invention discloses a composite layer metal plate and a manufacturing method thereof, and relates to the technical field of solar cell production. The composite layer metal plate comprises a metal plate, the metal plate comprises a metal net, the metal net is divided into a first area and a second area, and meshes of the first area of the metal net are filled with photo-sensitive glue; the metal plate is laid on the top face of the metal net, and the metal plate covers all the meshes of the second area, so that friction between the scraper and the top face of the metal plate is achieved; and the printing groove is formed in the metal plate, and the printing groove is located over all the meshes of the second area, so that ink on the metal plate flows into the meshes of the second area from the printing groove. According to the composite layer metal plate, the metal plate is laid and fixed on the metal net, the printing ink is poured on the metal plate, the metal plate replaces the metal net to rub with the scraper, the printing ink on the metal plate flows into the meshes of the second area of the metal net from the printing groove, and therefore pattern printing is achieved, and the abrasion resistance of the metal plate is improved through the composite layer metal plate.

Description

Technical Field

[0001] The present invention relates to the technical field of solar cell production, and particularly to a composite layer metal plate and a manufacturing method thereof. Background Art

[0002] In the production process of solar cells, screen printing plays a crucial role, and its requirements for printing quality are almost stringent. The metal plates currently applied to solar screen printing exhibit both advantages and disadvantages in actual production practice. From the perspective of advantages, the mesh accuracy of the metal plate is excellent, enabling extremely fine pattern printing. Taking the field of electronic component printing as an example, in this scenario with extremely high precision requirements, the metal plate can accurately and clearly present tiny circuits and markings, and can print fine patterns as small as dozens of micrometers at least, fully demonstrating its high-precision printing ability. In addition, the metal plate performs well in terms of tension tolerance. During the printing process, even when facing a large tension, it can always maintain a stable shape and is not prone to deformation. This stable structural characteristic makes the transfer of ink during printing more uniform, effectively ensuring the consistency of printing quality and laying a solid foundation for achieving high-quality solar screen printing. However, in the long-term industrial application of metal plates, some serious problems that need to be solved urgently have gradually emerged. Since during the printing operation, the metal mesh of the metal plate needs to be frequently rubbed with the squeegee for a long time, the structure of the metal mesh is extremely likely to change, resulting in a generally poor wear resistance of the metal plate. The negative impacts brought by this shortcoming are manifold: on the one hand, as the number of uses increases, the photosensitive glue on the metal mesh wears out, resulting in a gradual decline in the mesh accuracy, making it difficult to continuously meet the growing demand for high-precision printing in the solar industry, severely affecting the fineness of the printed pattern, and greatly reducing the product yield rate; on the other hand, the poor wear resistance significantly shortens the service life of the metal plate. Frequent replacement of the metal plate not only significantly increases the production cost, but also causes production stagnation due to the replacement operation, severely restricting the improvement of production efficiency. Summary of the Invention

[0003] Aiming at the defects existing in the prior art, the technical problem solved by the present invention is: how to improve the wear resistance of the metal plate.

[0004] To achieve the above object, in the first aspect, the composite layer metal plate provided by the present invention includes: A metal plate, which includes a metal mesh. The metal mesh is divided into a first region and a second region, and the mesh holes in the first region of the metal mesh are filled with photosensitive glue; A metal plate, which is laid on the top surface of the metal mesh, and the metal plate covers all the mesh holes in the second region to enable the squeegee to rub against the top surface of the metal plate; The printing groove is formed on the metal plate, and the printing groove is directly above the meshes of all the second regions, so as to enable the ink on the metal plate to flow from the printing groove into the meshes of the second regions.

[0005] By adopting the above technical solution, the ink is poured on the metal plate, and the metal plate replaces the metal mesh to rub against the squeegee, so that the ink on the metal plate flows from the printing groove into the meshes of the second region of the metal mesh, thereby realizing pattern printing, and solving the problems of reduced yield, increased cost and reduced production efficiency caused by the frequent friction between the metal mesh and the squeegee for a long time. Therefore, the composite layer metal plate improves the wear resistance of the metal plate.

[0006] Combined with the first aspect, in an embodiment, an adhesion layer is laid between the metal plate and the metal mesh. Through grooves are formed on the adhesion layer, and the trajectory of the through grooves is the same as that of the printing groove, so as to enable the ink on the metal plate to flow from the printing groove into the through grooves and finally into the meshes of the second region.

[0007] By adopting the above technical solution, the adhesion layer improves the stability of the metal plate fixed on the metal mesh; at the same time, it avoids the problem of the metal mesh cracking caused by the direct collision between the metal plate and the metal mesh.

[0008] In an embodiment, the adhesion layer is a polyimide film.

[0009] By adopting the above technical solution, the elastic buffer of the polyimide film further avoids the occurrence of metal mesh cracking.

[0010] In an embodiment, the adhesion layer is a Teflon coating.

[0011] By adopting the above technical solution, the adhesion strength between the metal plate and the metal mesh is improved; at the same time, the elastic buffer of the Teflon coating further avoids the occurrence of metal mesh cracking.

[0012] In an embodiment, the cross-section of the printing groove includes a plurality of grooves arranged in a stepped manner, and the openings of the grooves gradually decrease from top to bottom, so as to store ink in the grooves.

[0013] By adopting the above technical solution, the structural design of the printing groove can store ink in the grooves and avoid the phenomenon of grid line interruption.

[0014] In an embodiment, the connection between two adjacent grooves is a slope.

[0015] By adopting the above technical solution, the ink stored in the grooves can flow more smoothly into the meshes of the second region, thereby improving the clarity and accuracy of pattern printing and further avoiding the phenomenon of grid line interruption.

[0016] In one embodiment, the material of the metal plate is selected from nickel or copper.

[0017] By adopting the above technical solution, the wear resistance of the composite layer metal plate is further improved; at the same time, due to the friction of the squeegee, the metal plate will deform in the same way as the metal mesh. The above materials avoid the damage of the metal plate caused by frequent deformation.

[0018] In a second aspect, the present invention provides a method for manufacturing a composite layer metal plate, including the following steps: Place the metal plate horizontally and fill all the mesh holes of the metal mesh with photosensitive glue. After the photosensitive glue solidifies, lay the metal plate on the metal mesh through the adhesion layer. Simultaneously open slots for pattern printing on the metal plate, the adhesion layer and the metal mesh to form a composite layer metal plate.

[0019] By adopting the above technical solution, pour the ink on the metal plate. The metal plate replaces the metal mesh to rub with the squeegee, so that the ink on the metal plate flows into the mesh holes of the second area of the metal mesh from the printing slots, thereby realizing pattern printing. It solves the problems of reduced yield, increased cost and reduced production efficiency caused by the long-term frequent friction between the metal mesh and the squeegee. Therefore, the composite layer metal plate improves the wear resistance of the metal plate.

[0020] Combined with the second invention, in one embodiment, laying the metal plate on the metal mesh through the adhesion layer specifically includes: Coat the bottom surface of the metal plate with liquid polyamic acid and cure the liquid polyamic acid by heating. When the liquid polyamic acid is cured into a molten state, attach the metal plate to the metal mesh and perform an imidization reaction on the molten polyamic acid by heating and pressing. Wait for the molten polyamic acid to imidize into a polyimide film to form an adhesion layer.

[0021] By adopting the above technical solution, the adhesion layer improves the stability of the metal plate fixed on the metal mesh; at the same time, it avoids the problem of the metal mesh cracking caused by the direct collision between the metal plate and the metal mesh; the elastic buffer of the polyimide film further avoids the occurrence of metal mesh cracking.

[0022] In one embodiment, laying the metal plate on the metal mesh through the adhesion layer specifically includes: Spray the heated Teflon coating on the bottom surface of the metal plate. Wait for the Teflon coating to cool and form an adhesion layer. Bond and fix the metal plate on the metal mesh.

[0023] By adopting the above technical solution, the adhesion layer improves the stability of the metal plate fixed on the metal mesh; at the same time, it avoids the problem of the metal mesh cracking caused by the direct collision between the metal plate and the metal mesh; the Teflon coating enhances the bonding strength between the metal plate and the metal mesh; the elastic buffer of the Teflon coating further avoids the occurrence of metal mesh cracking.

[0024] In summary, the present invention includes at least one of the following beneficial technical effects: 1. By laying and fixing the metal plate on the metal mesh, pouring the ink on the metal plate, and making the metal plate rub against the squeegee instead of the metal mesh, the ink on the metal plate flows from the printing groove into the mesh holes of the second area of the metal mesh, thereby realizing pattern printing, which solves the problems of reduced yield, increased cost, and reduced production efficiency caused by the frequent friction between the metal mesh and the squeegee for a long time. Therefore, this composite layer metal plate improves the wear resistance of the metal plate; 2. By laying an adhesion layer between the metal plate and the metal mesh, the stability of the metal plate fixed on the metal mesh is improved; at the same time, it avoids the problem of the metal mesh cracking caused by the direct collision between the metal plate and the metal mesh; 3. The cross-section of the printing groove is designed as a structure arranged in multiple steps, realizing the storage of ink in the groove. When the squeegee rubs against the metal plate, when some printing grooves may not have ink entering due to uneven force, there is still ink that can enter the mesh holes of the second area, avoiding the phenomenon of grid line interruption. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic structural diagram of the composite layer metal plate according to an embodiment of the present invention; Figure 2 It is a schematic structural diagram of the metal plate according to an embodiment of the present invention; Figure 3 For Figure 1 exploded view; Figure 4 For Figure 3 A-A cross-sectional view of

[0026] In the figure: 1 - metal plate, 101 - metal mesh, 102 - hot melt adhesive, 103 - polyester mesh, 104 - metal mesh frame, 2 - metal plate, 3 - printing groove, 4 - adhesion layer, 5 - through groove, 6 - groove, 7 - slope. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The following further describes the embodiments of the present invention in detail with reference to the accompanying drawings.

[0028] The composite layer metal plate in the embodiment of the present invention, see Figure 1 、 2As shown, the composite layer metal plate and its manufacturing method include a metal plate 1, which includes a metal mesh 101. The metal mesh 101 is divided into a first area and a second area. The meshes of the first area of the metal mesh 101 are filled with photosensitive glue, and the meshes of the second area have no filling material. A metal plate 2, which is laid on the top surface of the metal mesh 101, and the metal plate 2 covers all the meshes of the second area to enable the squeegee to rub against the top surface of the metal plate 2. A printing groove 3, which is opened on the metal plate 2, and the printing groove 3 is located directly above all the meshes of the second area to enable the ink on the metal plate 2 to flow from the printing groove 3 into the meshes of the second area.

[0029] It can be seen from this that in the present invention, the metal plate 2 is laid and fixed on the metal mesh 101. When pattern printing is required, the metal plate 2 replaces the metal mesh 101 to rub against the squeegee, and the ink poured on the metal mesh 101 is poured on the metal plate 2. Through the back-and-forth swing of the squeegee, the ink enters the interior of the printing groove 3 on the metal plate 2. Since the printing groove 3 is located directly above all the meshes of the second area, and there is no photosensitive glue filled in the meshes of the second area of the metal mesh 101, the ink on the metal plate 2 flows from the printing groove 3 into the meshes of the second area of the metal mesh 101, thereby realizing pattern printing, and solving the problems of reduced yield, increased cost and reduced production efficiency caused by the long-term frequent friction between the metal mesh 101 and the squeegee. Therefore, the wear resistance of the metal plate 1 is improved for this composite layer metal plate.

[0030] Preferably, as shown in Figure 2 As shown, the metal plate 1 further includes a metal mesh frame 104, a polyester mesh 103 and a hot melt adhesive 102. The periphery of the metal mesh 101 is fixedly provided with a polyester mesh 103 through the hot melt adhesive 102, and the periphery of the polyester mesh 103 is fixedly provided with a metal mesh frame 104.

[0031] Specifically, when pattern printing is carried out, the squeegee presses down the metal plate 2 and a partial area of the metal mesh 101 synchronously. Since the polyester mesh 103 has elasticity, it will thus pull the periphery of the metal mesh 101. After the squeegee passes through the partial area, the polyester mesh 103 drives this area to return to the initial position.

[0032] Preferably, as shown in Figure 3 As shown, an adhesion layer 4 is laid between the metal plate 2 and the metal mesh 101. A through groove 5 is opened on the adhesion layer 4, and the trajectory of the through groove 5 is the same as that of the printing groove 3 to enable the ink on the metal plate 2 to flow from the printing groove 3 into the through groove 5 and finally into the meshes of the second area.

[0033] Specifically, an adhesive layer 4 is laid between the metal plate 2 and the metal mesh 101 to fixedly connect the metal plate 2 and the metal mesh 101. When pattern printing is performed, the ink enters the inside of the printing groove 3 on the metal plate 2 through the back-and-forth swing of the squeegee, then enters the inside of the through groove 5 of the adhesive layer 4, and finally flows into the mesh holes of the second area of the metal mesh 101 to achieve pattern printing. The adhesive layer 4 improves the stability of the metal plate 2 fixed on the metal mesh 101; at the same time, it avoids the problem of the metal mesh 101 cracking caused by the direct collision between the metal plate 2 and the metal mesh 101; in order to prevent the adhesive layer 4 from blocking the flow of the ink, through grooves 5 with the same trajectory (the same as both the printing groove 3 and the mesh holes of the second area) are opened on the adhesive layer 4, that is, the through groove 5 is directly below the printing groove 3 and directly above the mesh holes of the second area.

[0034] Further, a specific structure of the first adhesive layer 4 is provided: The adhesive layer 4 is a polyimide film (PI film).

[0035] Specifically, the polyimide film has excellent heat resistance, mechanical properties and chemical stability. The elastic buffer of the polyimide film further avoids the occurrence of cracking of the metal mesh 101, and can also effectively isolate the influence of the external environment on the metal mesh 101, and extend the overall service life of the metal plate 1.

[0036] Further, a specific structure of the second adhesive layer 4 is provided: The adhesive layer 4 is a Teflon coating.

[0037] Specifically, the adhesion strength between the metal plate 2 and the metal mesh 101 is further optimized; at the same time, the elastic buffer of the Teflon coating further avoids the occurrence of cracking of the metal mesh 101; and the production cost of the Teflon coating is reduced compared with that of the polyimide film.

[0038] Preferably, as shown in Figure 4 The cross-section of the printing groove 3 includes a plurality of grooves 6 arranged in a stepped manner, and the openings of the grooves 6 gradually decrease from top to bottom to store the ink in the grooves 6.

[0039] Specifically, the cross-section of the printing groove 3 is designed as a structure of a plurality of grooves 6 arranged in a stepped manner, and the openings of the grooves 6 gradually decrease from top to bottom, that is, in a descending staircase structure. This design can not only increase the ink storage capacity, but also prevent the ink from overflowing. When the squeegee rubs against the metal plate 2, due to uneven force, when some printing grooves 3 do not have ink entering, there is still ink that can enter the mesh holes of the second area, avoiding the phenomenon of grid line interruption.

[0040] Further, the connection between two adjacent grooves 6 is a slope 7.

[0041] Specifically, the slope 7 enables the ink stored in the groove 6 to flow more smoothly into the mesh holes in the second area, thereby improving the clarity and precision of pattern printing and further avoiding the phenomenon of grid line interruption; the slope of the slope 7 can be designed according to actual needs, and the depth and width of the groove 6 can also be designed according to actual needs. It is formed by numerical control machining, and then the wall surface of the groove 6 is polished to reduce the ink flow resistance.

[0042] Preferably, the material of the metal plate 2 is selected from nickel or copper.

[0043] Specifically, the above materials can further improve the wear resistance of the composite layer metal plate; at the same time, the metal plate 2 will undergo the same deformation as the metal mesh 101 due to the friction of the squeegee, and the above materials avoid the damage of the metal plate 2 caused by frequent deformation.

[0044] The manufacturing method of the composite layer metal plate in the embodiment of the present invention includes the following steps: Place the metal plate 1 horizontally and fill the photosensitive glue in all the mesh holes of the metal mesh 101; Ultrasonically clean the metal plate 2 with an organic solvent (such as acetone or ethanol) to remove surface oil stains and particles; increase the surface roughness of the metal plate 2 by sandblasting or chemical etching (such as dilute sulfuric acid solution) to improve the adhesion of the adhesion layer 4; After the photosensitive glue solidifies, lay the metal plate 2 on the metal mesh 101 through the adhesion layer 4; Simultaneously open slots for pattern printing on the metal plate 2, the adhesion layer 4 and the metal mesh 101 to form a composite layer metal plate.

[0045] It should be noted that for the slotting of the metal mesh 101, the photosensitive glue inside the mesh holes in the second area is removed to form slots for pattern printing.

[0046] It can be seen that in the present invention, the metal plate 2 is laid and fixed on the metal mesh 101. When pattern printing is required, the metal plate 2 replaces the metal mesh 101 to rub with the squeegee, and the ink poured on the metal mesh 101 is poured on the metal plate 2. Through the back-and-forth swing of the squeegee, the ink enters the inside of the printing slot 3 on the metal plate 2. Since the printing slot 3 is directly above all the mesh holes in the second area, and there is no photosensitive glue filled in the mesh holes in the second area of the metal mesh 101, the ink on the metal plate 2 flows from the printing slot 3 into the mesh holes in the second area of the metal mesh 101, thereby realizing pattern printing, solving the problems of reduced yield, increased cost and reduced production efficiency caused by the long-term frequent friction between the metal mesh 101 and the squeegee. Therefore, the composite layer metal plate improves the wear resistance of the metal plate 1.

[0047] Preferably, the metal plate 2 is laid on the metal mesh 101 through the adhesion layer 4. The first scheme specifically includes: Apply the liquid polyamic acid to the bottom surface of the metal plate 2 and cure the liquid polyamic acid by heating; When the liquid polyamic acid is cured to a molten state, attach the metal plate 2 to the metal mesh 101 and carry out an imidization reaction on the molten polyamic acid by heating and pressing; Wait for the molten polyamic acid to undergo an imidization reaction to form a polyimide film to form the adhesion layer 4.

[0048] Specifically, dissolve the polyamic acid (PAA) powder in a polar solvent (such as N-methylpyrrolidone, NMP) to prepare a uniform solution with a solid content of 15% - 25%; Adopt a doctor blade coating or spin coating process to uniformly coat the polyamic acid solution on the surface of the metal plate 2 and control the wet film thickness to be 20 - 50 μm; Let it stand at room temperature for 5 - 10 minutes to eliminate the bubbles and uneven thickness generated during the coating process; Cure the polyamic acid solution by heating. Wait for the polyamic acid solution to be cured to a molten state to remove most of the solvent, and make the polyamic acid partially crosslink to form a gel state with preliminary viscosity; Attach the metal plate 2 to the metal mesh 101 and ensure the precise alignment of the metal mesh 101 and the metal plate 2 through an optical positioning system; Carry out an imidization reaction on the molten polyamic acid by heating and pressing to convert it into a polyimide film, and at the same time tightly bond the metal mesh 101, the polyester mesh 103 and the metal substrate; After naturally cooling to room temperature, take out the composite layer structure from the hot press and check that the interface bonding has no delamination.

[0049] Preferably, lay the metal plate 2 on the metal mesh 101 through the adhesion layer 4. The second solution specifically includes: Spray the heated Teflon coating on the bottom surface of the metal plate 2; Wait for the Teflon coating to cool after spraying to form the adhesion layer 4; Bond and fix the metal plate 2 on the metal mesh 101.

[0050] Specifically, heat the Teflon coating or the metal plate 2 to 170 - 180 °C; Spray the Teflon coating on the bottom surface of the metal plate 2; After spraying, keep it at 170 - 180 °C for 3 - 5 minutes to make the coating level off initially and partially crosslink; naturally cool to 80 - 100 °C, and then quickly cool to room temperature (25 °C) through an air cooling or water cooling device; After the Teflon coating is sprayed and cooled, align and bond the cooled metal plate 2 with the metal mesh 101; apply pressure (5-10 MPa) and press for 10-15 minutes to achieve physical bonding between the metal mesh 101 and the metal plate 2 by utilizing the viscoelasticity of the Teflon coating, so as to form the adhesion layer 4; If it is necessary to enhance the bonding strength, it can be cured in an oven at 120-150 °C for 30 minutes to promote the chemical bonding between the coating and the metal mesh 101.

[0051] The above are only specific embodiments of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A composite metal plate, characterized in that: It includes: A metal plate (1), comprising a metal mesh (101), wherein the metal mesh (101) is divided into a first region and a second region, and the mesh holes in the first region of the metal mesh (101) are filled with photosensitive adhesive; A metal plate (2) laid on the top surface of the metal mesh (101), and the metal plate (2) covers all mesh holes in the second area, so that the scraper and the top surface of the metal plate (2) can rub against each other; A printing groove (3) is provided on the metal plate (2), and the printing groove (3) is located directly above the mesh holes of all the second regions, so that the ink on the metal plate (2) can flow from the printing groove (3) into the mesh holes of the second region.

2. The composite metal plate according to claim 1, characterized in that: An adhesive layer (4) is laid between the metal plate (2) and the metal mesh (101), and a through slot (5) is provided on the adhesive layer (4), wherein the trajectory of the through slot (5) is the same as the trajectory of the printing slot (3), so that the ink on the metal plate (2) flows from the printing slot (3) into the through slot (5) and finally into the mesh holes in the second area.

3. The composite metal plate according to claim 2, characterized in that: The adhesive layer (4) is a polyimide film.

4. The composite metal plate according to claim 2, characterized in that: The adhesion layer (4) is Teflon coating.

5. The composite metal plate according to claim 1, characterized in that: The cross section of the printing groove (3) comprises a plurality of grooves (6) arranged in a stepped manner, and the openings of the grooves (6) are gradually reduced from top to bottom, so that ink is stored in the grooves (6).

6. The composite metal plate according to claim 4, characterized in that: The connection between two adjacent grooves (6) is a slope (7).

7. The composite metal plate according to claim 1, characterized in that: The material of the metal plate (2) is nickel or copper.

8. The method for making a composite layer metal plate according to claim 1, characterized in that: The following steps are involved: The metal plate (1) is placed horizontally, and all the mesh holes of the metal mesh (101) are filled with photosensitive glue; After the photosensitive adhesive is solidified, the metal plate (2) is laid on the metal mesh (101) through the adhesive layer (4); Grooves for pattern printing are simultaneously formed on the metal plate (2), the adhesive layer (4) and the metal mesh (101) to form a composite layer metal plate.

9. The method for making a composite layer metal plate according to claim 8, characterized in that: Laying the metal plate (2) on the metal mesh (101) via the adhesive layer (4) specifically includes: Coating liquid polyamic acid on the bottom surface of the metal plate (2), and solidifying the liquid polyamic acid by heating; When the liquid polyamic acid solidifies into a molten state, the metal plate (2) is attached to the metal mesh (101), and the molten polyamic acid is subjected to an imidization reaction by heating and pressurizing; The molten polyamic acid is imidized to form a polyimide film to form an adhesion layer (4).

10. The method for making a composite layer metal plate according to claim 8, characterized in that: Laying the metal plate (2) on the metal mesh (101) via the adhesive layer (4) specifically includes: Spraying heated Teflon coating on the bottom surface of the metal plate (2); After the Teflon coating is sprayed and cooled, an adhesion layer (4) is formed; The metal plate (2) is bonded and fixed on the metal mesh (101).

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