Composite screen printing plate

Abstract

The utility model provides a composite screen printing plate which comprises a pattern layer and a supporting layer which is overlapped with the pattern layer, and openings in the supporting layer are communicated with corresponding grid holes in the pattern layer. 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 dry film block formed after development can be prevented from falling off. Moreover, a plurality of first connecting lines and a plurality of second connecting lines which play a bridging role and are arranged in a crossed manner are arranged in each opening, and the crisscrossed first connecting lines and second connecting lines are used for supporting the part, located in the opening area, of the pattern layer, so that enough strength in the grid line arrangement direction can be ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of solar cells, and in particular relates to a composite 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, during the production process, the line widths of the main and auxiliary grids are only a dozen microns, resulting in dry film patches of a similar width after development. This makes the dry film patches easily detach from the core film, creating 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 problems existing in the prior art, the purpose of the embodiments of the present invention is to provide a composite screen to solve the problem in the prior art that the main grid or sub-grid of the electroformed screen is insufficient in line width, which easily causes the dry film blocks formed after development to fall off.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is to provide a composite screen, comprising:

[0005] A pattern layer, wherein a plurality of gate lines are arranged at intervals, and a gate hole is formed between two adjacent gate lines; and

[0006] 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;

[0007] 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 first connecting lines extending along the first direction and a plurality of second connecting lines extending along the second direction are arranged inside each opening, and the first connecting lines and the second connecting lines are arranged to intersect with each other to form a grid or mesh inside the opening that can pass ink and is connected to the gate hole.

[0008] Furthermore, in the same opening, two adjacent first connecting lines are arranged in parallel and at equal intervals, and two adjacent second connecting lines are arranged in parallel and at equal intervals.

[0009] Furthermore, the angle between the first connecting line and the second connecting line is 60° to 90°.

[0010] Furthermore, within the same opening, the grids or meshes have the same shape and size.

[0011] Furthermore, the width of the first connecting line and the second connecting line are both less than or equal to 30 micrometers.

[0012] Furthermore, an extending direction of the first connecting line is perpendicular to an extending direction of the gate line, and an extending direction of the second connecting line is parallel to an extending direction of the gate line.

[0013] Furthermore, the angle between the extension direction of the first connecting line and the extension direction of the gate line is 45° to 90°, the angle between the extension direction of the second connecting line and the extension direction of the gate line is 45° to 90°, and the angle between the extension direction of the first connecting line and the extension direction of the second connecting line is 60° to 90°.

[0014] Furthermore, 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 composite screen coincide with each other.

[0015] Furthermore, the width of each opening is more than three times the width of the corresponding gate hole.

[0016] Furthermore, the support layer is a metal layer integrally formed by an electroforming process.

[0017] 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:

[0018] The composite screen in the embodiment of the present invention includes a graphic layer and a support layer superimposed on the graphic layer. The graphic layer is provided with a plurality of grid lines at intervals, with grid holes formed between adjacent grid lines. The support layer is provided with a plurality of openings, which 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 resolving the problem of insufficient strength of the electroformed screen along the direction in which the grid lines extend. On the other hand, the area of ​​the dry film block after development can be effectively increased, thereby resolving the defect that the insufficient width of the grid lines of the electroformed screen easily causes the dry film block formed after development to fall off. In addition, a plurality of first connecting lines extending along the first direction and a plurality of second connecting lines extending along the second direction are arranged inside each opening. The first connecting lines and the second connecting lines that act as bridges are arranged to cross each other. The criss-crossing first connecting lines and the second connecting lines can be used to form a support for the portion of the graphic layer located in the opening area, thereby ensuring that the gate line arrangement direction has sufficient strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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.

[0020] Figure 1 A schematic structural diagram of the composite screen provided in Example 1 of the present utility model;

[0021] Figure 2 A schematic structural diagram of the support layer provided in Example 1 of the present utility model;

[0022] Figure 3 A schematic structural diagram of a composite screen provided in Example 2 of the present utility model;

[0023] Figure 4 A schematic structural diagram of the support layer provided in Example 2 of the present utility model;

[0024] Figure 5 A schematic structural diagram of the graphics layer provided in an embodiment of the present utility model.

[0025] Among them, the reference numerals in the figures are:

[0026] 1-graphic layer; 2-support layer; 3-grid line;

[0027] 4-gate hole; 5-opening; 6-first connecting line;

[0028] 7-Second connecting line; 8-Grid. DETAILED DESCRIPTION

[0029] 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.

[0030] 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.

[0031] 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.

[0032] Please also refer to Figures 1 to 5The composite screen provided by the embodiment of the present invention will now be described. The composite screen provided by the embodiment of the present invention includes a graphic layer 1 and a support layer 2. 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. The support layer 2 is arranged to overlap with the graphic layer 1. 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. 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. Such a design enables the area defined by each grid hole 4 to be located within the area defined by the corresponding opening 5. Since the portion of the support layer 2 other than the opening 5 area can support the graphic layer 1, it can enhance the strength of the graphic layer 1 along the extension direction of the grid lines 3, thereby effectively solving the problem of insufficient strength of the electroformed screen along the extension direction of the grid lines 3. Furthermore, each opening 5 is provided with a plurality of first connecting lines 6 extending in a first direction and a plurality of second connecting lines 7 extending in a second direction. The first connecting lines 6 and the second connecting lines 7 are intersectingly arranged to form a grid 8 or mesh within the opening 5 that is permeable to ink and communicates with the grid holes 4. The intersecting first connecting lines 6 and second connecting lines 7 provide support for the portion of the pattern layer 1 located within the opening 5, thereby ensuring sufficient strength in 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 pattern 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 can be effectively increased. This can overcome the defect of the dry film block formed after development, which is easily detached due to insufficient line width of the grid lines 3 of the electroformed screen, and prevent the detached dry film block from clogging the holes in the screen, causing the screen to be scrapped, thereby improving the yield rate of screen production. It should be noted that, since the first connecting lines 6 and the second connecting lines 7 are only intersected inside the openings 5 ​​on the support layer 2, and the first connecting lines 6 and the second connecting lines 7 do not exist in the gate holes 4 of the graphic layer 1, the silver paste can smoothly pass through the gate holes 4 of the graphic layer 1 during the printing process, and has 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 good consistency after printing.

[0033] Compared with the prior art, the composite 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 provide support for the graphic layer 1, thereby enhancing 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, the area of ​​the dry film block after development can be effectively increased, thereby overcoming the defect that the dry film block formed after development is easily detached due to insufficient line width of the grid lines 3 of the electroformed screen. In addition, a plurality of first connecting lines 6 extending along the first direction and a plurality of second connecting lines 7 extending along the second direction are arranged inside each opening 5. The first connecting lines 6 and the second connecting lines 7 that act as bridges are arranged to cross each other. The criss-crossing first connecting lines 6 and the second connecting lines 7 can be used to support the portion of the graphic layer 1 located in the opening 5 area, thereby ensuring that the arrangement direction of the gate lines 3 has sufficient strength.

[0034] Please refer to Figure 2 and Figure 4 In some embodiments, within the same opening 5, two adjacent first connecting lines 6 are arranged in parallel and at equal intervals, and two adjacent second connecting lines 7 are arranged in parallel and at equal intervals. A criss-cross grid structure can be formed by crossing a plurality of parallel and equally spaced first connecting lines 6 and a plurality of parallel and equally spaced second connecting lines 7, thereby providing uniform support for the graphic layer 1, so that the force on the portion of the graphic layer 1 located in the opening 5 area is balanced, thereby further enhancing the strength of the graphic layer 1 along the arrangement direction of the gate lines 3.

[0035] Please refer to Figure 2 and Figure 4 In some embodiments, within the same opening 5, the angle between the first connecting lines 6 and the second connecting lines 7 is 60° to 90°, so that the multiple first connecting lines 6 and the multiple second connecting lines 7 intersect to form a crisscross grid structure, which can provide uniform and sufficient support for the pattern layer 1. Preferably, the angle between the first connecting lines 6 and the second connecting lines 7 is 90°, so that the multiple first connecting lines 6 and the multiple second connecting lines 7 intersect to form a crisscross grid structure. The grids 8 or meshes are rectangular in shape and have uniform sizes. This provides uniform support for the pattern layer 1 while having little impact on the ink permeability of the pattern layer 1, thereby ensuring good consistency of the printed circuits on the silicon wafer surface.

[0036] In some embodiments, the width of the first connecting lines 6 and the second connecting lines 7 are both less than or equal to 30 microns. On the one hand, this can ensure that the criss-crossing grid structure formed by the intersection of the multiple first connecting lines 6 and the multiple second connecting lines 7 can provide sufficient strength to support the graphic layer 1. On the other hand, it can avoid the influence of the criss-crossing grid structure formed by the intersection of the multiple first connecting lines 6 and the multiple second connecting lines 7 on the ink permeability 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.

[0037] Please refer to Figure 3 and Figure 4 In some embodiments, the extension direction of the first connecting lines 6 is perpendicular to the extension direction of the gate lines 3, and the extension direction of the second connecting lines 7 is parallel to the extension direction of the gate lines 3. This can ensure that the criss-crossing grid structure formed by the intersection of multiple first connecting lines 6 and multiple second connecting lines 7 can provide sufficient strength to support the graphic layer 1.

[0038] Please refer to Figure 1 and Figure 2 In some embodiments, the angle between the extension direction of the first connecting line 6 and the extension direction of the gate line 3 is 45° to 90°, the angle between the extension direction of the second connecting line 7 and the extension direction of the gate line 3 is 45° to 90°, and the angle between the extension direction of the first connecting line 6 and the extension direction of the second connecting line 7 is 60° to 90°, which can ensure that the criss-crossing grid structure formed by the intersection of multiple first connecting lines 6 and multiple second connecting lines 7 can provide sufficient strength to support the graphic layer 1.

[0039] Please refer to Figure 1 and Figure 3 In some embodiments, each grid hole 4 is located centered within the corresponding opening 5, such that the projection of the centerline of each grid hole 4 and the centerline of the corresponding opening 5 on the same surface of the screen coincides. This structural arrangement allows the portion of the support layer 2 excluding the opening 5 region to 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 resolving the problem of insufficient strength of the electroformed screen along the direction in which the grid lines 3 extend. Furthermore, it effectively increases the area of ​​the dry film block after development, thereby overcoming the problem of the dry film block formed after development being easily detached due to insufficient line width of the grid lines 3 in the electroformed screen.

[0040] Please refer to further Figure 1 and Figure 3The width of each opening 5 is more than three times the width of the corresponding grid hole 4, which can effectively increase the area of ​​the dry film block after development, overcome the defect that the line width of the grid line 3 of the electroforming screen is insufficient and easily causes the dry film block formed after development to fall off, and avoid the fallen dry film block from clogging the holes on the screen and causing the screen to be scrapped, thereby improving the yield rate of screen production.

[0041] 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.

[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 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 composite 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 supporting layer superposed on the graphic layer, the supporting layer being provided with a plurality of openings, the openings being provided in one-to-one correspondence with the gate holes, and each opening being in communication with the corresponding gate hole, the width of each opening being greater than the width of the corresponding gate hole, and the length of each opening being 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; In which, each of the openings is provided with a plurality of first connecting lines extending along the first direction and a plurality of second connecting lines extending along the second direction, and the first connecting lines and the second connecting lines are arranged to cross each other to form a grid or mesh inside the opening that can pass ink and is connected to the grid hole.

2. The composite screen according to claim 1, wherein: In the same opening, two adjacent first connecting lines are arranged in parallel and have an equal spacing therebetween, and two adjacent second connecting lines are arranged in parallel and have an equal spacing therebetween.

3. The composite screen as claimed in claim 1, wherein: The included angle between the first connecting line and the second connecting line is 60° to 90°.

4. The composite screen as claimed in claim 1, wherein: In the same opening, the grids or meshes have the same shape and size.

5. The composite screen as claimed in claim 1, wherein: The widths of the first connecting line and the second connecting line are both less than or equal to 30 micrometers.

6. The composite screen as claimed in claim 1, wherein: An extending direction of the first connecting line is perpendicular to an extending direction of the gate line, and an extending direction of the second connecting line is parallel to an extending direction of the gate line.

7. The composite screen as claimed in claim 1, wherein: The angle between the extension direction of the first connecting line and the extension direction of the gate line is 45° to 90°, the angle between the extension direction of the second connecting line and the extension direction of the gate line is 45° to 90°, and the angle between the extension direction of the first connecting line and the extension direction of the second connecting line is 60° to 90°.

8. The composite screen as claimed in 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 in the same surface of the composite screen coincide with each other.

9. The composite screen according to any one of claims 1 to 8, wherein: The width of each opening is more than three times the width of the corresponding gate hole.

10. The composite screen according to any one of claims 1 to 8, wherein: The support layer is a metal layer integrally formed by an electroforming process.

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