Screen printing plate

Abstract

The utility model provides a screen printing plate, which comprises a graphic layer and a support layer overlapped with the graphic layer, a plurality of grid lines are arranged on the graphic layer at intervals, a grid hole is formed between every two adjacent grid lines, an opening is arranged on the support layer corresponding to each grid hole, and each opening is communicated with the corresponding grid hole. The width of each opening is greater than the width of the corresponding gate hole, and the length of each opening is greater than or equal to the length of the corresponding gate hole, so that on one hand, the part of the supporting layer except the opening area can support the pattern layer, and the strength of the pattern layer along the extension direction of the gate line can be enhanced; therefore, the problem that the strength of the electroforming screen printing plate in the extending direction of the grid lines is insufficient is effectively solved, on the other hand, the area of a dry film block after development can be effectively increased, and the defect that the dry film block formed after development is likely to fall off due to the insufficient line width of the grid lines of the electroforming screen printing plate can be overcome. In addition, the linear bridging structures arranged in the openings of the supporting layer at intervals can ensure that the grid lines have enough strength in the arrangement direction.

Description

Technical Field

[0001] The utility model belongs to the technical field of solar cells, and in particular relates to a screen. Background Art

[0002] The principle of screen printing is to use a squeegee on the printing press to press down on the screen, allowing the ink to pass through the screen and onto the substrate. Currently, when printing fine patterns such as solar cell circuits, a knotless mesh is typically used. This allows only warp or weft yarns to be present in the pattern openings, enabling the printing of circuits with a good aspect ratio. However, the knot removal process affects the mesh strength and the number of prints the screen can produce. Electroformed screens do not have the knot problem, but their insufficient strength reduces the number of prints, thus reducing the overall lifespan of the electroformed screen. While steel sheet electroformed screens have a long lifespan, the dry film patches formed after development are also only a few microns wide due to the line width of the main and auxiliary grids being only a few microns during the production process. This makes the dry film patches easily detach from the core film. This detachment can cause pore blocking defects in the electroformed screen, rendering the screen scrapped and severely limiting the yield of the electroformed screen process. Utility Model Content

[0003] Based on the above-mentioned problems existing in the prior art, the purpose of the embodiments of the present utility model is to provide a screen to solve the problems existing in the prior art of insufficient strength of the electroformed screen along the direction of grid line extension, and insufficient line width of the main grid or auxiliary grid of the electroformed screen, which easily causes the dry film blocks formed after development to fall off.

[0004] To achieve the above object, the technical solution adopted by the present invention is: providing a screen, comprising a graphic layer, with a plurality of grid lines arranged at intervals, and grid holes formed between two adjacent grid lines; and

[0005] A support layer is superposed on the graphic layer, and a plurality of openings are provided on the support layer. The openings are arranged in a one-to-one correspondence with the gate holes, and each opening is connected to a corresponding gate hole;

[0006] The width of each opening is greater than the width of the corresponding gate hole, and the length of each opening is greater than or equal to the length of the corresponding gate hole, so that the area defined by each gate hole is located within the area defined by the corresponding opening; a plurality of linear bridging structures are arranged at intervals inside each opening, and the angle between the extension direction of each linear bridging structure and the length direction of the corresponding opening is greater than or equal to 45°.

[0007] Furthermore, the width of each opening is 3 to 20 times the width of the corresponding gate hole.

[0008] Furthermore, in the same opening, the intervals between two adjacent linear bridging structures are equal, and the two adjacent linear bridging structures are arranged in parallel.

[0009] Furthermore, the linear bridging structures are distributed in an array on the support layer.

[0010] Furthermore, the width of the linear bridging structure is less than or equal to 30 micrometers.

[0011] Furthermore, the included angle between the extension direction of each linear bridging structure and the length direction of the corresponding opening is 90°.

[0012] Furthermore, the distance between two adjacent grid holes is equal, and the two grid holes are arranged in parallel.

[0013] Furthermore, the distance between two adjacent openings is equal, and the two openings are arranged in parallel.

[0014] Furthermore, each of the grid holes is located at a central position of the corresponding opening, so that the projections formed by the center line of each of the grid holes and the center line of the corresponding opening on the same surface of the screen coincide with each other.

[0015] Furthermore, the support layer is a metal layer integrally formed by an electroforming process.

[0016] Compared with the prior art, the one or more technical solutions in the embodiments of the present invention have at least one of the following beneficial effects:

[0017] The screen in the embodiment of the present invention includes a graphic layer and a support layer superimposed on the graphic layer. A plurality of grid lines are arranged at intervals on the graphic layer, and grid holes are formed between two adjacent grid lines. The support layer is provided with a plurality of openings, and the plurality of openings are arranged in a one-to-one correspondence with the plurality of grid holes, and each opening is connected to the corresponding grid hole. Because the width of each opening is greater than the width of the corresponding grid hole, and the length of each opening is greater than or equal to the length of the corresponding grid hole, on the one hand, the portion of the support layer other than the opening area can provide support for the graphic layer, thereby enhancing the strength of the graphic layer along the direction in which the grid lines extend, thereby effectively solving the problem of insufficient strength of the electroformed screen along the direction in which the grid lines extend. On the other hand, it can effectively increase the area of ​​the dry film block after development, thereby overcoming the defect that the dry film block formed after development is easily detached due to insufficient line width of the grid lines of the electroformed screen. In addition, a plurality of linear bridging structures are arranged at intervals within each opening of the support layer, and the linear bridging structures can ensure sufficient strength in the direction in which the grid lines are arranged. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. 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 any creative labor.

[0019] Figure 1 A schematic structural diagram of a screen provided in an embodiment of the present utility model;

[0020] Figure 2 A schematic diagram of the structure of the graphics layer provided in an embodiment of the present utility model;

[0021] Figure 3 A schematic structural diagram of the support layer provided in an embodiment of the present utility model.

[0022] Among them, the reference numerals in the figures are:

[0023] 1-graphic layer; 2-support layer; 3-grid line;

[0024] 4-gate hole; 5-opening; 6-linear bridging structure. DETAILED DESCRIPTION

[0025] 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 with reference to 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 intended to limit the present invention.

[0026] It should be noted that when an element is referred to as being "connected to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined. In the description of this utility model, it should be noted that, unless otherwise specified or defined, the terms "mounted," "connected," and "connected" should be interpreted broadly. For example, they can mean fixed, removable, or integral; mechanical or electrical; direct or indirect through an intermediary; internal communication between two elements; or interaction between two elements. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0027] Reference throughout this 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 embodiments" appear in various places throughout this specification, not all references are to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0028] Please also refer to Figures 1 to 3The screen provided by an embodiment of the present invention will now be described. The screen provided by an embodiment of the present invention includes a pattern layer 1 and a support layer 2. A plurality of grid lines 3 are spaced apart on the pattern layer 1, with grid holes 4 formed between adjacent grid lines 3. The support layer 2 is superimposed on the pattern layer 1 and provided with a plurality of openings 5. The openings 5 ​​correspond one-to-one with the grid holes 4, and each opening 5 communicates with a corresponding grid hole 4. Specifically, the width of each opening 5 is greater than the width of the corresponding grid hole 4, and the length of each opening 5 is greater than or equal to the length of the corresponding grid hole 4. This design ensures that the area defined by each grid hole 4 is located within the area defined by the corresponding opening 5. In other words, after the support layer 2 and the pattern layer 1 are superimposed, each grid hole 4 in the pattern layer 1 communicates with the corresponding opening 5 in the support layer 2, forming a T-shaped hole structure or an inverted T-shaped slot structure. Because the portion of the support layer 2 other than the openings 5 ​​provides support for the pattern layer 1, the strength of the pattern layer 1 along the direction in which the grid lines 3 extend is enhanced, thereby effectively resolving the problem of insufficient strength of the electroformed screen along the direction in which the grid lines 3 extend. Furthermore, a plurality of linear bridging structures 6 are spaced apart within each opening 5. The angle between the extension direction of each linear bridging structure 6 and the length direction of the corresponding opening 5 is greater than or equal to 45°. These linear bridging structures 6 reinforce the patterned layer 1, further enhancing the strength of the patterned layer 1 along the arrangement direction of the grid lines 3. Furthermore, because the length of each opening 5 on the support layer 2 is greater than or equal to the length of the corresponding grid hole 4 on the patterned layer 1, and the width of each opening 5 is greater than the width of the corresponding grid hole 4, the area of ​​the dry film block after development is effectively increased. This overcomes the problem of insufficient grid line 3 width in electroformed screens, which can easily cause the dry film blocks formed after development to fall off. This prevents the fallen dry film blocks from clogging holes in the screen and causing the screen to be scrapped, thereby improving the yield rate of screen production. It should be noted that, since a plurality of linear bridging structures 6 are arranged only inside the openings 5 ​​on the support layer 2, and no linear bridging structures 6 exist in the grid holes 4 of the graphic layer 1, the silver paste can smoothly pass through the grid holes 4 of the graphic layer 1 during the printing process, with almost no effect on the ink permeable space of the graphic layer 1, thereby enabling the circuits on the surface of the silicon wafer to have better consistency after printing.

[0029] Compared with the prior art, the screen provided by the embodiment of the present invention includes a graphic layer 1 and a support layer 2 superimposed on the graphic layer 1. A plurality of grid lines 3 are arranged at intervals on the graphic layer 1, and grid holes 4 are formed between two adjacent grid lines 3. A plurality of openings 5 ​​are provided on the support layer 2. The plurality of openings 5 ​​are arranged in a one-to-one correspondence with the plurality of grid holes 4, and each opening 5 is connected to the corresponding grid hole 4. Because the width of each opening 5 is greater than the width of the corresponding grid hole 4, and the length of each opening 5 is greater than or equal to the length of the corresponding grid hole 4, on the one hand, the portion of the support layer 2 other than the opening 5 area can form a support function for the graphic layer 1, which can enhance the strength of the graphic layer 1 along the direction in which the grid lines 3 extend, thereby effectively solving the problem of insufficient strength of the electroformed screen along the direction in which the grid lines 3 extend. On the other hand, it can effectively increase the area of ​​the dry film block after development, which can overcome the defect that the line width of the grid lines 3 of the electroformed screen is insufficient and the dry film block formed after development easily falls off. Furthermore, a plurality of linear bridge structures 6 are spaced apart inside each opening 5 of the support layer 2 . The linear bridge structures 6 can ensure that the arrangement direction of the gate lines 3 on the pattern layer 1 has sufficient strength.

[0030] Please refer to Figure 1 and Figure 2 In some embodiments, the width of each opening 5 is 3 to 20 times the width of the corresponding gate hole 4, which not only ensures that the circuit on the surface of the silicon wafer has good consistency after printing, but also effectively increases the area of ​​the dry film block after development. It can overcome the defect that the dry film block formed after development is easily detached due to insufficient line width of the gate line 3 of the electroformed screen, and avoid the detached dry film block from clogging the holes in the screen and causing the screen to be scrapped, thereby improving the yield rate of screen production.

[0031] Please refer to Figure 1 and Figure 3 In some embodiments, the spacing between two adjacent linear bridging structures 6 is equal, and the two adjacent linear bridging structures 6 are arranged in parallel. The strength of the graphic layer 1 along the arrangement direction of the gate lines 3 can be further enhanced by the linear bridging structures 6 arranged in parallel and at equal intervals.

[0032] Please refer to Figure 1 、 Figure 2 and Figure 3 In some embodiments, the linear bridging structures 6 are distributed in an array on the support layer 2. The linear bridging structures 6 arranged in an array can provide uniform reinforcement for the patterned layer 1, thereby further enhancing the strength of the patterned layer 1 along the direction in which the gate lines 3 are arranged. It should be noted that the linear bridging structures 6 can be arranged in a rectangular array on the support layer 2.

[0033] Please refer to Figure 1 and Figure 3In some embodiments, the width of the linear bridging structure 6 is less than or equal to 30 microns. On the one hand, this ensures that the linear bridging structure 6 can ensure that the arrangement direction of the gate lines 3 on the graphic layer 1 has sufficient strength. On the other hand, this can prevent the linear bridging structure 6 from affecting the ink penetration of the gate holes 4 on the graphic layer 1, ensuring that the silver paste can smoothly pass through the gate holes 4 on the graphic layer 1 during the printing process, thereby ensuring that the circuits on the surface of the silicon wafer have good consistency after printing.

[0034] Please refer to Figure 1 and Figure 3 In some embodiments, the angle between the extension direction of each linear bridging structure 6 and the length direction of the corresponding opening 5 is 90°. On the one hand, this ensures that the linear bridging structure 6 can ensure that the arrangement direction of the grid lines 3 on the graphic layer 1 has sufficient strength. On the other hand, it can avoid the influence of the linear bridging structure 6 on the ink penetration of the grid holes 4 on the graphic layer 1.

[0035] Please refer to Figure 1 and Figure 2 In some embodiments, the width and length of the gate holes 4 are equal, the spacing between two adjacent gate holes 4 is equal, and the two gate holes 4 are arranged in parallel, so that the circuits on the surface of the silicon wafer have good consistency after printing.

[0036] Please refer to Figure 1 and Figure 3 In some embodiments, the distance between two adjacent openings 5 ​​is equal, and the two openings 5 ​​are arranged in parallel.

[0037] Please refer to Figure 1 In some embodiments, each grid hole 4 is located in the center of the corresponding opening 5, so that the projection of the center line of each grid hole 4 and the center line of the corresponding opening 5 on the same surface of the screen coincides. Through the above-mentioned structural arrangement, on the one hand, the portion of the support layer 2 other than the opening 5 area can provide strong support for the pattern layer 1, effectively enhancing the strength of the pattern layer 1 along the direction in which the grid lines 3 extend, thereby effectively solving the problem of insufficient strength of the electroformed screen along the direction in which the grid lines 3 extend. On the other hand, it can effectively increase the area of ​​the dry film block after development, which can overcome the defect that the line width of the electroformed screen grid lines 3 is insufficient and easily causes the dry film block formed after development to fall off.

[0038] In some embodiments, to ensure good structural strength, support layer 2 is a metal layer integrally formed using an electroforming process. The metal layer can be made of a single metal material such as nickel, or an alloy material such as a nickel alloy. Graphic layer 1 can be a metal layer made of a metal material, or a film layer made of a soft film material such as PI, PU, ​​PE, TPE, PET, PVC, or PMMA.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A screen, characterized in that: include: The graphic layer has a plurality of grid lines arranged at intervals, with grid holes formed between two adjacent grid lines; as well as A support layer is superposed on the graphic layer, and a plurality of openings are provided on the support layer. The openings are arranged in a one-to-one correspondence with the gate holes, and each opening is connected to a corresponding gate hole; The width of each opening is greater than the width of the corresponding gate hole, and the length of each opening is greater than or equal to the length of the corresponding gate hole, so that the area defined by each gate hole is located within the area defined by the corresponding opening; a plurality of linear bridging structures are arranged at intervals inside each opening, and the angle between the extension direction of each linear bridging structure and the length direction of the corresponding opening is greater than or equal to 45°.

2. The screen plate according to claim 1, wherein: The width of each opening is 3 to 20 times the width of the corresponding gate hole.

3. The screen plate according to claim 1, wherein: In the same opening, the intervals between two adjacent linear bridging structures are equal, and the two adjacent linear bridging structures are arranged in parallel.

4. The screen plate according to claim 1, wherein: The linear bridging structures are distributed in an array on the support layer.

5. The screen plate according to claim 1, wherein: The width of the linear bridging structure is less than or equal to 30 micrometers.

6. The screen plate according to claim 1, wherein: The included angle between the extension direction of each linear bridging structure and the length direction of the corresponding opening is 90°.

7. The screen plate according to claim 1, wherein: The distance between two adjacent grid holes is equal, and the two grid holes are arranged in parallel.

8. The screen plate according to claim 1, wherein: The distance between two adjacent openings is equal, and the two openings are arranged in parallel.

9. The screen plate according to claim 1, wherein: Each of the grid holes is located at the center of the corresponding opening, so that the projections formed by the center line of each of the grid holes and the center line of the corresponding opening on the same surface of the screen coincide with each other.

10. The screen plate according to any one of claims 1 to 9, wherein: The support layer is a metal layer integrally formed by an electroforming process.

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