Silk-screen printing plate for solar cell

Abstract

The utility model provides a silk-screen printing plate for a solar cell, which is characterized in that a polyester net with a second window in the center is stretched in a frame body, a hot melt adhesive film is laminated on the polyester net, and a steel wire net is laminated on the hot melt adhesive film and corresponds to the position of the second window. The area of the steel wire mesh is larger than that of the second window, so that the peripheral edge of the steel wire mesh is lapped on the inner peripheral edge of the hot melt adhesive film. The overlapped part of the outer peripheral edge of the steel wire mesh and the inner peripheral edge of the polyester mesh is compounded through hot melting of the hot melt adhesive film, so that the overlapped area compounded by the steel wire mesh and the polyester mesh is filled and repaired through the hot melt adhesive film, and the wear resistance and corrosion resistance of the overlapped area compounded by the periphery of the steel wire mesh and the polyester mesh are enhanced; and slurry seepage and slurry leakage in an overlapped area formed by compounding the periphery of the steel wire mesh and the polyester mesh are effectively prevented. In addition, stress borne by the steel wire mesh when the steel wire mesh is extruded by the scraping strip can be released through the polyester mesh in the stress releasing area, and the probability that steel wires of the steel wire mesh are broken is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of solar cell processing and manufacturing equipment, in particular to a screen printing screen for solar cells. Background Art

[0002] Screen printing is a process used in mass production of solar cells. Its purpose is to print a conductive paste containing metal onto a silicon wafer through the mesh holes of the screen to form circuits and / or electrodes. The screen printing screen for solar cells generally uses a steel mesh as the material for the printing area, and the periphery is composited with a polyester mesh to give the steel mesh a certain resilience to achieve the purpose of printing. Currently, the overlapping area where the periphery of the steel mesh is composited with the polyester mesh is usually filled and repaired with UV emulsion, but as the number of printings increases, the UV emulsion is easily corroded by wear and corrosion, which can easily lead to slurry seepage and leakage in the overlapping area where the periphery of the steel mesh is composited with the polyester mesh, and cause the overlapping area where the periphery of the steel mesh is composited with the polyester mesh to crack and explode, thereby reducing the service life of the screen. Utility Model Content

[0003] Based on the above-mentioned problems existing in the prior art, the purpose of the embodiments of the utility model is to provide a screen printing plate for solar cells, so as to solve the problem that in the screen printing plate structure existing in the prior art, the UV emulsion filled and repaired in the overlapping area where the periphery of the steel wire mesh and the polyester mesh are composited is easily worn and corroded, resulting in seepage and leakage of slurry in the overlapping area where the periphery of the steel wire mesh and the polyester mesh are composited.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: to provide a screen printing screen for solar cells, comprising:

[0005] A frame body having a first window formed therein;

[0006] A polyester net is stretched in the first window, the outer edge of the polyester net is connected to the frame, and a second window is opened in the central part of the polyester net;

[0007] A hot melt adhesive film is laminated on the polyester web, wherein the hot melt adhesive film is a wear-resistant, solvent-resistant, flexible and resilient film layer; and

[0008] A steel mesh is stacked on the hot melt adhesive film and corresponds to the position of the second window, and the area of ​​the steel mesh is larger than the area of ​​the second window, so that the outer edge of the steel mesh overlaps the inner edge of the hot melt adhesive film;

[0009] Among them, the overlapping part of the outer edge of the steel wire mesh and the inner edge of the polyester mesh is hot-melt composited by the hot-melt adhesive film, so that the overlapping area of ​​the steel wire mesh and the polyester mesh is filled and repaired by the hot-melt adhesive film; the outer size of the hot-melt adhesive film is smaller than the outer size of the polyester mesh, so that the hot-melt adhesive film located on the periphery of the steel wire mesh and the polyester mesh located at the edge of the frame form a stress release area.

[0010] Furthermore, the hot melt adhesive film is a polyurethane film.

[0011] Furthermore, a first connection area is provided at a portion of the polyester mesh adjacent to the frame, and a second connection area is formed by an overlapping area of ​​the steel mesh and the polyester mesh filled and compounded by the hot melt adhesive film, and the hardness of the first connection area is less than that of the second connection area.

[0012] Furthermore, the mesh number of the polyester mesh is 180-200 meshes, and the wire diameter of the polyester mesh is 50-55 microns.

[0013] Furthermore, the mesh number of the steel wire mesh is 480-520 meshes, and the wire diameter of the steel wire mesh is 8-11 microns.

[0014] Furthermore, the hot melt adhesive film includes a hot melt adhesive filling area located in the overlapping area where the polyester mesh and the steel wire mesh are composited and a hot melt adhesive coating area adjacent to the hot melt adhesive filling area.

[0015] Furthermore, the outer dimension of the hot melt adhesive coating area is smaller than the outer dimension of the polyester net, so that the hot melt adhesive film located at the outer periphery of the hot melt adhesive coating area and the polyester net located at the edge of the frame form a stress release area.

[0016] Furthermore, the first window is a square window, and the second window is a square window.

[0017] Furthermore, the steel wire mesh located in the second window portion forms a graphic printing area.

[0018] Furthermore, the frame is a square aluminum frame.

[0019] Compared with the prior art, the above one or more technical solutions in the embodiments of the present invention have at least one of the following beneficial effects:

[0020] The solar cell screen printing screen in the embodiment of the utility model has a polyester mesh with a second window in the central part stretched inside the frame, a hot melt adhesive film is laminated on the polyester mesh, and then a steel mesh is laminated on the hot melt adhesive film and corresponds to the position of the second window. Since the area of ​​the steel mesh is larger than the area of ​​the second window, the outer edge of the steel mesh overlaps the inner edge of the hot melt adhesive film. Since the overlapping part of the outer edge of the steel mesh and the inner edge of the polyester mesh is hot-melt composited by the hot melt adhesive film, the overlapping area of ​​the steel mesh and the polyester mesh is filled and repaired by the hot melt adhesive film, the wear resistance and corrosion resistance of the overlapping area of ​​the steel mesh and the polyester mesh are enhanced, and the slurry seepage and leakage of the overlapping area of ​​the steel mesh and the polyester mesh are effectively prevented. Furthermore, the outer dimensions of the hot-melt adhesive film are smaller than those of the polyester mesh, so that the hot-melt adhesive film located on the outer periphery of the steel mesh and the polyester mesh located at the edge of the frame form a stress release zone. The stress borne by the steel mesh when squeezed by the scraper can be released through the polyester mesh in the stress release zone, so that the steel mesh can effectively rebound, thereby reducing the probability of wire breakage of the steel mesh and reducing the explosion rate of the screen printing plate for solar cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0022] Figure 1 A schematic diagram of the structure of a screen printing screen for solar cells provided by the utility model;

[0023] Figure 2 A schematic diagram of the structure of the frame provided by the utility model;

[0024] Figure 3 This is a schematic diagram of the structure in which the polyester net provided by the utility model is assembled on a frame;

[0025] Figure 4 This is a schematic diagram of the structure in which the polyester net and the hot-melt adhesive film provided by the utility model are assembled on a frame;

[0026] Figure 5 This is a structural schematic diagram of the wire mesh provided by the utility model.

[0027] Among them, the reference numerals in the figure are:

[0028] 1-frame; 11-first window; 2-polyester net; 21-second window;

[0029] 3-hot melt adhesive film; 31-hot melt adhesive filling area; 32-hot melt adhesive laminating area;

[0030] 4-wire mesh; 5-first connection area; 6-second connection area. DETAILED DESCRIPTION

[0031] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0032] It should be noted that when an element is referred to as "connected to" or "set on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly specified and specifically defined. In the description of the present utility model, it should be noted that, unless otherwise clearly specified and defined, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0033] Reference throughout the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, when the phrases "in one embodiment," "in some embodiments," or "in some of these embodiments" appear in various places throughout the specification, not all references are to the same embodiment. Furthermore, in one or more embodiments, the particular features, structures, or characteristics may be combined in any suitable manner.

[0034] Please also read Figures 1 to 5The screen printing screen for solar cells provided by the embodiment of the utility model is now described. The screen printing screen for solar cells provided by the embodiment of the utility model includes a frame 1, a polyester mesh 2, a hot melt adhesive film 3 and a steel mesh 4. The frame 1 is a square aluminum frame. A first window 11 is formed inside the frame 1. The polyester mesh 2 is stretched in the first window 11 of the frame 1. A first connecting area 5 is provided on a portion of the polyester mesh 2 adjacent to the frame 1. The outer edge of the polyester mesh 2 is connected to the frame 1. The hot melt adhesive film 3 is laminated on the polyester mesh 2. The hot melt adhesive film 3 is a wear-resistant, solvent-resistant, flexible and resilient film layer. A second window 21 is provided in the central portion of the polyester mesh 2. The steel mesh 4 is laminated on the hot melt adhesive film 3 and corresponds to the position of the second window 21. The area of ​​the steel mesh 4 is larger than the area of ​​the second window 21. The steel mesh 4 and the polyester mesh 2 are filled and compounded with the hot melt adhesive film 3 to form a second connection area 6. The outer edge of the steel mesh 4 overlaps the inner edge of the hot melt adhesive film 3. The portion where the outer edge of the steel mesh 4 overlaps with the inner edge of the polyester mesh 2 is hot-melted and compounded by the hot melt adhesive film 3, so that the overlapping area where the steel mesh 4 and the polyester mesh 2 are compounded is filled and repaired by the hot melt adhesive film 3, thereby enhancing the wear resistance and corrosion resistance of the overlapping area where the periphery of the steel mesh 4 and the polyester mesh 2 are compounded, and preventing the slurry from seeping and leaking in the overlapping area where the periphery of the steel mesh 4 and the polyester mesh 2 are compounded. In addition, the outer size of the hot melt adhesive film 3 is smaller than the outer size of the polyester mesh 2. Therefore, a stress release zone can be formed by the hot melt adhesive film 3 on the outer periphery of the steel mesh 4 and the polyester mesh 2 located at the edge of the frame 1, so that the stress borne by the steel mesh 4 when being squeezed by the scraper can be released through the polyester mesh 2 in the stress release zone, so that the steel mesh 4 can be effectively rebounded, thereby reducing the probability of wire breakage of the steel mesh 4, thereby reducing the explosion rate of the screen printing screen for solar cells, thereby extending the service life of the screen printing screen for solar cells, and improving the quality of screen printing. Specifically, the hot melt adhesive film 3 is a polyurethane film. It should be noted that a polyurethane film with a thickness of 40 to 60 microns is used, and hot melt compounding is performed at a temperature of 120 to 140°C, and the time of hot melt compounding is controlled at 5 to 10 minutes, so that the outer edge of the steel mesh 4 and the inner edge of the polyester mesh 2 are hot melt compounded.

[0035] Compared with the prior art, the composite screen printing screen provided by the embodiment of the utility model has a polyester mesh 2 with a second window 21 in the central part stretched inside the frame 1, a hot melt adhesive film 3 is laminated on the polyester mesh 2, and a steel mesh 4 is laminated on the hot melt adhesive film 3 and corresponds to the position of the second window 21. Since the area of ​​the steel mesh 4 is larger than the area of ​​the second window 21, the outer edge of the steel mesh 4 overlaps the inner edge of the hot melt adhesive film 3. Since the portion where the outer edge of the steel mesh 4 overlaps with the inner edge of the polyester mesh 2 is hot-melted and laminated by the hot melt adhesive film 3, the overlapping area where the steel mesh 4 and the polyester mesh 2 are laminated is filled and repaired by the hot melt adhesive film 3, thereby enhancing the wear resistance and corrosion resistance of the overlapping area where the periphery of the steel mesh 4 and the polyester mesh 2 are laminated, and effectively preventing the overlap area where the periphery of the steel mesh 4 and the polyester mesh 2 are laminated from slurry seepage and leakage. Furthermore, the outer dimensions of the hot melt adhesive film 3 are smaller than the outer dimensions of the polyester mesh 2, so that the hot melt adhesive film 3 located on the outer periphery of the steel wire mesh 4 and the polyester mesh 2 located at the edge of the frame 1 form a stress release zone. The stress borne by the steel wire mesh 4 when squeezed by the scraper can be released through the polyester mesh 2 in the stress release zone, so that the steel wire mesh 4 can be effectively rebounded, thereby reducing the probability of wire breakage of the steel wire mesh 4, thereby reducing the explosion rate of the screen printing plate for solar cells.

[0036] Please refer to Figure 1 , Figure 3 and Figure 5 In some embodiments, the polyester mesh 2 is provided with a first connection area 5 at a portion adjacent to the frame 1, and the steel mesh 4 and the polyester mesh 2 are filled with a composite overlapping area through the hot melt adhesive film 3 to form a second connection area 6. The hardness of the first connection area 5 is less than that of the second connection area 6, and the second connection area 6 is the hot melt adhesive filling area 31. Since the second connection area 6 has a greater hardness and strength, the steel mesh 4 has a stable and reliable connection effect, which can prevent the steel mesh 4 from being squeezed by the scraper during the printing process and causing the steel mesh 4 and the polyester mesh 2 to break. At the same time, the pressure of the scraper on the steel mesh 4 will cause the polyester mesh 2 to be in a tight state, and the internal stress of the polyester mesh 2 will increase. The texture of the first connection area 5 is softer and weaker than that of the second connection area 6, so that the increased stress inside the polyester mesh 2 can be released through the first connection area 5, thereby preventing the polyester mesh 2 from breaking.

[0037] In some embodiments, the mesh number of the polyester mesh 2 is 180-200 meshes, and the wire diameter of the polyester mesh 2 is 50-55 microns.

[0038] In some embodiments, the mesh number of the steel mesh 4 is 480-520 meshes, and the wire diameter of the steel mesh 4 is 8-11 microns.

[0039] Please refer to Figure 1 and Figure 4In some embodiments, the hot melt adhesive film 3 includes a hot melt adhesive filling area 31 located in the overlapping area of ​​the composite polyester mesh 2 and the steel mesh 4 and a hot melt adhesive coating area 32 adjacent to the hot melt adhesive filling area 31. The hot melt adhesive filling area 31 can fill and repair the overlapping area of ​​the composite steel mesh 4 and the polyester mesh 2 through the hot melt adhesive film 3, thereby enhancing the wear resistance and corrosion resistance of the overlapping area of ​​the composite steel mesh 4 and the polyester mesh 2, and preventing the overlapping area of ​​the composite steel mesh 4 and the polyester mesh 2 from seeping and leaking. The hot melt adhesive coating area 32 can prevent the conductive slurry from leaking from the mesh of the polyester mesh 2.

[0040] Please refer to Figure 1 and Figure 4 In some of the embodiments, the outer dimensions of the hot melt adhesive coating area 32 are smaller than the outer dimensions of the polyester mesh 2, so that the hot melt adhesive film 3 located at the outer periphery of the hot melt adhesive coating area 32 and the polyester mesh 2 located at the edge of the frame 1 form a stress release area. In addition, the outer dimensions of the hot melt adhesive film 3 are smaller than the outer dimensions of the polyester mesh 2. Therefore, a stress release area can be formed by the hot melt adhesive film 3 located at the outer periphery of the hot melt adhesive coating area 32 and the polyester mesh 2 located at the edge of the frame 1, so that the stress borne by the steel wire mesh 4 when being squeezed by the scraper strip can be released through the polyester mesh 2 in the stress release area, so that the steel wire mesh 4 can be effectively rebounded, thereby reducing the probability of wire breakage of the steel wire mesh 4, thereby reducing the explosion rate of the screen printing screen for solar cells, and thereby extending the service life of the screen printing screen for solar cells.

[0041] Please refer to Figure 1 , Figure 2 and Figure 3 In some embodiments, the first window 11 is a square window, the second window 21 is a square window, and the wire mesh 4 located in the second window 21 forms a graphic printing area.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A screen printing screen for solar cells, characterized in that: include: A frame body having a first window formed therein; A polyester net is stretched in the first window, the outer edge of the polyester net is connected to the frame, and a second window is opened in the central part of the polyester net; A hot melt adhesive film is laminated on the polyester web, wherein the hot melt adhesive film is a wear-resistant, solvent-resistant, flexible and resilient film layer; as well as A steel mesh is stacked on the hot melt adhesive film and corresponds to the position of the second window, and the area of ​​the steel mesh is larger than the area of ​​the second window, so that the outer edge of the steel mesh overlaps the inner edge of the hot melt adhesive film; Among them, the overlapping part of the outer edge of the steel wire mesh and the inner edge of the polyester mesh is hot-melt composited by the hot-melt adhesive film, so that the overlapping area of ​​the steel wire mesh and the polyester mesh is filled and repaired by the hot-melt adhesive film; the outer size of the hot-melt adhesive film is smaller than the outer size of the polyester mesh, so that the hot-melt adhesive film located on the periphery of the steel wire mesh and the polyester mesh located at the edge of the frame form a stress release area.

2. The screen printing plate for solar cells according to claim 1, characterized in that: The hot melt adhesive film is a polyurethane film.

3. The screen printing plate for solar cells according to claim 1, wherein: The polyester mesh is provided with a first connection area at a portion adjacent to the frame, and the steel mesh and the polyester mesh are formed into a second connection area by an overlapping area filled and compounded by the hot melt adhesive film. The hardness of the first connection area is less than that of the second connection area.

4. The screen printing screen for solar cells according to claim 1, characterized in that: The mesh number of the polyester mesh is 180-200 meshes, and the wire diameter of the polyester mesh is 50-55 microns.

5. The screen printing screen for solar cells according to claim 1, characterized in that: The mesh number of the steel wire mesh is 480-520 meshes, and the wire diameter of the steel wire mesh is 8-11 microns.

6. The screen printing screen for solar cells according to claim 1, characterized in that: The hot melt adhesive film comprises a hot melt adhesive filling area located in the overlapping area where the polyester mesh and the steel wire mesh are combined and a hot melt adhesive coating area adjacent to the hot melt adhesive filling area.

7. The screen printing plate for solar cells according to claim 6, characterized in that: The outer dimension of the hot melt adhesive coating area is smaller than the outer dimension of the polyester net, so that the hot melt adhesive film located at the outer periphery of the hot melt adhesive coating area and the polyester net located at the edge of the frame form a stress release area.

8. The screen printing screen for solar cells according to claim 1, characterized in that: The first window is a square window, and the second window is a square window.

9. The screen printing screen for solar cells according to claim 8, characterized in that: The steel screen located at the second window portion forms a graphic printing area.

10. The screen printing plate for solar cells according to any one of claims 1 to 9, characterized in that: The frame is a square aluminum frame.

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