Screen printing plate

Abstract

The utility model relates to the field of precision screens, in particular to a screen printing plate. Comprising a screen frame and screen cloth arranged in the screen frame. The screen cloth comprises at least two layers of multiple transverse lines and longitudinal lines which are arranged in a stacked mode, and the line diameters of the adjacent transverse lines and / or longitudinal lines are different. The thickness of the screen cloth is changed by changing the line diameters of the transverse lines and / or the longitudinal lines in the screen printing plate, and the thicknesses of other parts of the grid line are reduced on the premise of ensuring the electrical parameters of the grid line when the thicknesses of different screen cloth are changed in the printing process, so that the raw materials are saved, and the production cost is reduced. And the purpose of reducing cost is achieved.

Description

Technical Field

[0001] This utility model relates to the field of screen printing, specifically to a printing screen. Background Technology

[0002] Mesh made of metallic or non-metallic wires has a wide range of applications, such as touch screens, semiconductors, solar cells, MLCCs, filtration, screening, and silicon wafer screen printing. Taking photovoltaic silicon wafers as an example, one of the important components is the grid line. As a key material for the conductivity of solar cells, its height, width, number, and other factors determine the photoelectric conversion efficiency of the solar cell. Grid lines are generally made from silver paste through a screen printing process. During the manufacturing process, it is crucial to ensure the thickness of each part of the grid line, as current flows through all parts. If the thickness of a part is insufficient, it will affect the electrical parameters of the grid line; if the thickness is excessive, it will result in material waste and increased costs. In current technology, the thickness of each part of the grid line is generally uniform during printing, which requires more raw materials and increases costs. Utility Model Content

[0003] The present invention aims to provide a printing screen to solve the problems of high manufacturing cost and large amount of raw materials required in the prior art.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] This utility model discloses a printing screen, including a screen frame and a mesh fabric disposed within the screen frame; the mesh fabric includes at least two layers of overlapping horizontal and vertical lines, with adjacent horizontal and / or vertical lines having different diameters.

[0006] Preferably, the diameter of any of the horizontal lines is the same or different at different positions.

[0007] Preferably, the diameter of any of the longitudinal lines is the same or different at different positions.

[0008] Preferably, the diameter of some of the horizontal or vertical lines gradually increases along a direction perpendicular to the horizontal.

[0009] Preferably, the spacing between the horizontal lines and / or the vertical lines is the same.

[0010] Preferably, the angle between the horizontal line and the vertical line is 1° to 90°.

[0011] Preferably, the transverse and / or longitudinal lines are circular radial surfaces, elliptical radial surfaces, or concave surfaces.

[0012] Preferably, the transverse and longitudinal lines are metal wires or non-metal wires.

[0013] Preferably, the horizontal lines are arranged in parallel with each other, and the vertical lines are arranged in parallel with each other.

[0014] Preferably, the transverse lines and the longitudinal lines are bonded together.

[0015] Compared with the prior art, this utility model achieves the following technical effects:

[0016] This invention changes the thickness of the screen by altering the diameter of the horizontal and / or vertical lines. During the printing process, different screen thicknesses result in varying thicknesses at different parts of the grid lines. This reduces the thickness of other parts of the grid lines while maintaining their electrical parameters, thereby saving raw materials and reducing costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of existing mesh wrapping technology;

[0018] Figure 2 This is a side view of a pre-existing mesh fabric stack.

[0019] Figure 3 This is a schematic diagram of existing silicon wafer gate lines;

[0020] Figure 4 A schematic diagram showing the current magnitude of the gate line on an existing silicon wafer;

[0021] Figure 5 This is a schematic diagram of the mesh structure in this embodiment.

[0022] Reference numerals: 1. Horizontal line; 2. Vertical line; 3. Frame; 11. First horizontal line; 12. Second horizontal line; 13. Third horizontal line. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0024] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are merely used for distinction in description and have no special meaning.

[0026] Reference Figure 3 and Figure 4 As shown, the grid lines of a photovoltaic module generally include a main grid line 01 and a fine grid line 02. One end of the fine grid line 02 is connected to the main grid line 01, and it collects the electrical energy generated by the module onto the main grid line 01, which then conducts the current. It can be understood that during the current collection process, the closer the fine grid line 02 is to the main grid line 01, the more electrical energy it collects, and the stronger the current-carrying capacity required for the fine grid line 02. Similarly, for the main grid line 01, the closer it is to the conduction end, the stronger the current-carrying capacity required for the main grid line 01. Figure 4 The diagram shows the gate current of the silicon wafer. The thicker the line, the stronger the current-carrying capacity required for the corresponding gate section. The current-carrying capacity of the gate is positively correlated with its cross-sectional area; that is, the larger the cross-sectional area of ​​the gate, the stronger its current-carrying capacity.

[0027] Reference Figure 1 and Figure 2 As shown, in the prior art, whether the wire mesh is prepared by weaving or by layering, the same diameter wires are used, resulting in relatively uniform wire thickness. This leads to insufficient thickness in the wire mesh sections requiring high current carrying capacity, while wasting raw materials in the sections requiring lower current carrying capacity. Therefore, this invention provides a printing screen that can prepare wire meshes of different thicknesses, thereby meeting the current carrying capacity requirements of the prepared wire meshes, saving raw materials, and reducing costs.

[0028] This utility model discloses a printing screen, comprising a screen frame 3 and a mesh fabric disposed within the screen frame 3; the mesh fabric comprises at least two layers of overlapping horizontal lines 1 and vertical lines 2, with adjacent horizontal lines 1 and / or vertical lines 2 having different diameters. Each horizontal line 1 is arranged parallel to the others, and each vertical line 2 is arranged parallel to the others. The horizontal lines 1 and vertical lines 2 are bonded together.

[0029] In one embodiment, the diameter of any horizontal line 1 may be the same or different at different positions. In another embodiment, the diameter of any vertical line 2 may be the same or different at different positions. See reference. Figure 5As shown, this is understandable. The diameters of the horizontal lines 1 and vertical lines 2 can be set in various ways. For example, the diameter of any horizontal line 1 can be the same at different positions, while the diameter of any vertical line 2 can be different at different positions; or the diameter of any horizontal line 1 can be different at different positions, while the diameter of any vertical line 2 can be the same at different positions, and so on. Specifically, taking the example of any horizontal line 1 having the same diameter at different positions, while the diameter of any vertical line 2 differs at different positions, several horizontal lines 1 are evenly arranged in parallel, and their diameters are all the same, while the diameter of one or more vertical lines 2 gradually increases from one end to the other. If the spacing between the vertical lines 2 (the distance between their geometric central axes) is equal, then the end with the larger diameter of the vertical line 2 will have a smaller distance between adjacent vertical lines 2. During ink penetration, the amount of printing material that can leak through will be reduced. If the ink penetration area of ​​the mesh is set along the extension direction of the vertical lines 2, it is possible to create meshes with varying thicknesses at different positions to meet different current carrying requirements.

[0030] The preferred wire diameter range for the horizontal line 1 and the vertical line 2 of this invention is between 6 and 30 μm. This range includes most printed grid line sizes in the prior art, thus meeting most printing requirements on the market. The initial wire diameter is selected within the above range and must meet the basic electrical parameters of the grid line. The wire diameters of the other horizontal lines 1 and / or vertical lines 2 are adjusted based on the initial wire diameter. The wire diameters of the horizontal lines 1 and / or vertical lines 2 can be 50%-150% of the initial wire diameter.

[0031] In another embodiment, the diameter of several transverse lines 1 or longitudinal lines 1 gradually increases along a direction perpendicular to the parallel lines. For example, continuing to refer to... Figure 5 As shown, the diameters of the first horizontal line 11, the second horizontal line 12, and the third horizontal line 13 gradually increase. For example, the diameter of the first horizontal line 11 is 10 μm, the diameter of the second horizontal line 12 is 11 μm, and the diameter of the third horizontal line 13 is 12 μm. Then, along the direction from the first horizontal line 11 to the third horizontal line, the spacing between adjacent horizontal lines 1 gradually decreases (provided that the geometric central axes of the horizontal lines are equally spaced). Therefore, along this direction, the smaller the space formed by the horizontal lines 1, the vertical lines 2, and the silicon wafer, the less printing material can be accommodated during ink penetration, i.e., the smaller the cross-sectional area of ​​the formed gate lines.

[0032] In summary, this utility model achieves variations in the thickness of the mesh or the size of the mesh openings by using transverse and / or longitudinal lines of different diameters. Consequently, during printing, the thickness of the grid lines prepared at different locations is not uniform, ensuring that the required thickness of the grid lines is met and that areas where thickness is not required can be made thinner, thus achieving the goal of reducing costs.

[0033] It should be noted that the above embodiments are merely examples. Any difference in wire diameter at different positions of the same thread (horizontal or longitudinal) and / or any difference in wire diameter between any two threads fall within the scope of protection of this utility model.

[0034] In another optional embodiment of this utility model, the included angle formed between the horizontal line 1 and the vertical line 2 is 1° to 90°, and the horizontal lines 11 are arranged parallel to each other; the vertical lines 22 are arranged parallel to each other; and the horizontal lines 11 and the vertical lines 22 are in contact at an angle of 1° to 90°; the angle can be 1°, 2°, 3°, 4°, 5°, 6°, 7°, 8°, 9°, 10°, 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, 70°, 75°, 80°, 85° or 90°, or a sub-range composed of any value in these ranges, or the commonly used angles can be 30°, 45°, 60° and 90°. In another optional embodiment of this utility model, the transverse line 1 and the longitudinal line 2 are metal wires or non-metal wires. In this embodiment, the transverse line 1 and the longitudinal line 2 are preferably non-metal wires, which can be carbon fiber wires, and the preferred metal wires are tungsten wires or stainless steel wires.

[0035] In another optional embodiment of this utility model, the transverse line 1 and / or the longitudinal line 2 are circular radial surfaces, elliptical radial surfaces, or concave surfaces. In this embodiment, an elliptical radial surface refers to the radial surface formed by pressing (i.e., flattening) a thread with a regular circular radial surface. For example, its shape can be a standard ellipse or a similar ellipse. In this embodiment, when the diameter of the transverse line 1 is smaller than the diameter of the longitudinal line 2 or the diameter of the longitudinal line 2 is smaller than the diameter of the transverse line 1, the surface formed by their contact is a concave surface.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A printing screen, characterized in that, It includes a wire frame (3) and a wire mesh fabric disposed within the wire frame (3); the wire mesh fabric includes at least two layers of overlapping horizontal lines (1) and vertical lines (2), with adjacent horizontal lines (1) and / or vertical lines (2) having different wire diameters.

2. The printing screen according to claim 1, characterized in that, The diameter of any of the horizontal lines (1) may be the same or different at different positions.

3. A printing screen according to claim 2, characterized in that, The diameter of any of the longitudinal lines (2) may be the same or different at different positions.

4. A printing screen according to claim 1, characterized in that, Along a direction perpendicular to the horizontal, the diameter of several of the horizontal lines (1) or vertical lines (2) gradually increases.

5. A printing screen according to claim 1, characterized in that, The spacing between the horizontal lines (1) and / or the vertical lines (2) is the same.

6. A printing screen according to claim 1, characterized in that, The angle between the horizontal line (1) and the vertical line (2) is 1° to 90°.

7. A printing screen according to claim 1, characterized in that, The transverse line (1) and / or longitudinal line (2) are circular radial surfaces, elliptical radial surfaces, or concave surfaces.

8. A printing screen according to claim 1, characterized in that, The horizontal line (1) and the vertical line (2) are either metal wires or non-metal wires.

9. A printing screen according to claim 1, characterized in that, Each horizontal line (1) is set in parallel with each other, and each vertical line (2) is set in parallel with each other.

10. A printing screen according to claim 1, characterized in that, The horizontal line (1) and the vertical line (2) are bonded together.

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