Screen printing plate

Abstract

The utility model discloses a screen printing plate which comprises a first metal layer and a second metal layer. The first metal layer comprises a plurality of first grid lines, and each first grid line comprises a plurality of first through holes arranged in a penetrating mode and connecting bridges located between the adjacent first through holes. The second metal layer and the first metal layer are arranged in a stacked mode, the second metal layer comprises a plurality of second grid lines, the second grid lines comprise second penetrating holes arranged in a penetrating mode, and the second penetrating holes and the first penetrating holes are correspondingly arranged and communicated with each other. Wherein the duty ratio of the first through hole in the first metal layer is greater than or equal to the duty ratio of the second through hole in the second metal layer; the thickness of the first metal layer is not greater than 30 [mu] m, and the thickness of the second metal layer is not greater than 30 [mu] m and not less than 3 [mu] m; the printing screen can effectively improve the inking quality, so that the printing quality is improved.

Description

Technical Field

[0001] This application relates to the field of screen printing technology, and more particularly to a printing screen. Background Technology

[0002] Printing screens are an important tool in the electronics field. Taking the printing of solar cell electrodes as an example, paste is poured onto the printing screen, and a squeegee is used to move the paste on the printing screen, so that the paste is squeezed through the mesh of the printing screen onto the solar cell, forming a corresponding pattern on the solar cell to form the solar cell electrode.

[0003] Traditional printing screens, due to the intersection of warp and weft threads forming knots, result in knots in the final electrode, which can affect the conductivity or conversion efficiency of the electrode film. To address this issue, existing printing screens employ a knot-free design using expanded metal mesh; however, expanded metal mesh suffers from printing problems such as uneven ink distribution. Therefore, there is an urgent need to provide a new printing screen structure to solve the technical problems of existing technologies. Utility Model Content

[0004] Therefore, it is necessary to provide a printing screen to solve the above-mentioned technical problems.

[0005] One technical solution of this application is:

[0006] A printing screen comprising:

[0007] A first metal layer includes a plurality of first gate lines, each gate line including a plurality of through-hole segments and connecting bridges located between adjacent first through-holes;

[0008] A second metal layer is stacked on top of the first metal layer. The second metal layer includes a plurality of second gate lines. Each second gate line includes a through-hole. The second through-hole and the plurality of first through-holes are correspondingly disposed and interconnected with each other.

[0009] Wherein, the duty cycle of the first perforation in the first metal layer is greater than or equal to the duty cycle of the second perforation in the second metal layer; the thickness of the first metal layer is not greater than 30 μm, and the thickness of the second metal layer is not greater than 30 μm and not less than 3 μm.

[0010] In one embodiment, the width of the first perforation is greater than the width of the second perforation.

[0011] In one embodiment, the printing screen includes a printing surface located on the first metal layer and a bottom surface located on the second metal layer, the printing surface and the bottom surface being disposed opposite to each other.

[0012] In one embodiment, the printed surface is provided with micro / nano structures that are raised and / or recessed.

[0013] In one embodiment, the micro / nano structure is a recessed grid, the depth of which on the first metal layer is less than or equal to the thickness of the first metal layer.

[0014] In one embodiment, the grid comprises interwoven mesh lines, with at least one of the mesh lines extending obliquely relative to the first grid line.

[0015] In one embodiment, an AG structure is provided on the printed surface, the height of the AG structure is in the range of 10nm-5μm, and the width of the AG structure is in the range of 50nm-50μm.

[0016] In one embodiment, a soft layer is provided on the bottom surface, the thickness of the soft layer being greater than or equal to 1 μm and the Mohs hardness being less than or equal to 300.

[0017] In one embodiment, the soft layer has a thickness ranging from 1 μm to 10 μm and a Mohs hardness ranging from 0.5 to 300.

[0018] In one embodiment, the soft layer is a tin layer, an aluminum layer, a copper layer, or a gold layer.

[0019] The beneficial effects of this application are: the duty cycle of the first perforation in the first metal layer is greater than or equal to the duty cycle of the second perforation in the second metal layer; the thickness of the first metal layer is not greater than 30 micrometers, and the thickness of the second metal layer is not greater than 30 micrometers and not less than 3 micrometers; the printing screen can effectively improve the ink application quality, thereby improving the printing quality. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the planar structure of a printing screen according to this application;

[0021] Figure 2 For along Figure 1 Schematic diagram of the cross-sectional structure of line A-A' in the middle;

[0022] Figure 3 For along Figure 1 Schematic diagram of the cross-sectional structure of line B-B' in the middle;

[0023] Figure 4 This is a schematic diagram of another cross-sectional structure of a printing screen according to this application;

[0024] Figure 5 This is a schematic diagram of another cross-sectional structure of a printing screen according to this application;

[0025] Figure 6This is a schematic diagram of another cross-sectional structure of a printing screen according to this application. Detailed Implementation

[0026] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. Preferred embodiments of this application are shown in the drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described below. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this application.

[0027] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0029] This utility model discloses a printing screen comprising a first metal layer and a second metal layer. The first metal layer includes a plurality of first grid lines, each grid line including a plurality of through-hole segments and connecting bridges located between adjacent first perforations. A second metal layer is stacked on top of the first metal layer, and the second metal layer includes a plurality of second grid lines, each grid line including through-hole segments. The second perforations and the plurality of first perforations are correspondingly arranged and interconnected. The duty cycle of the first perforations in the first metal layer is greater than or equal to the duty cycle of the second perforations in the second metal layer; the thickness of the first metal layer is no greater than 30 micrometers, and the thickness of the second metal layer is no greater than 30 micrometers and no less than 3 micrometers. This printing screen can effectively improve ink application quality, thereby improving printing quality.

[0030] In one embodiment, the width of the first perforation is greater than the width of the second perforation, which helps to control the amount of ink dispensed and improve the ink quality.

[0031] In one example, the printing screen includes a printing surface on a first metal layer and a bottom surface on a second metal layer, with the printing surface and bottom surface positioned opposite each other. The printing surface has raised and / or recessed micro / nano structures. These micro / nano structures facilitate control of the squeegee when used on the printing surface, thereby improving print quality.

[0032] In one embodiment, the micro / nano structure is a recessed grid, the depth of the grid on the first metal layer is less than or equal to the thickness of the first metal layer, and the recess depth of the grid ranges from 3μm to 30μm.

[0033] In one embodiment, the grid is formed by interlacing mesh lines, with at least one mesh line extending obliquely relative to the first grid line. Thus, the doctor blade direction is intersected with the obliquely extending mesh line, which facilitates further control of the doctor blade and improves ink application quality.

[0034] In one embodiment, an AG structure is provided on the printing surface. The height of the AG structure ranges from 10 nm to 5 μm, and the width of the AG structure ranges from 50 nm to 50 μm. Providing an AG structure on the printing surface increases the overall roughness of the printing surface, which facilitates the control of ink application by the doctor blade during ink scraping.

[0035] In one embodiment, a soft layer is provided on the bottom surface, the thickness of which is greater than or equal to 1 μm and the Mohs hardness is less than or equal to 300. The soft layer effectively avoids the risk of the silicon wafer cracking due to the printing electrodes on the screen printing plate, prevents damage to the silicon wafer by the squeegee, and effectively disperses the force exerted by the soft layer on the silicon wafer, thereby effectively protecting the silicon wafer and improving printing quality. Preferably, the soft layer has a thickness ranging from 1 μm to 10 μm and a Mohs hardness ranging from 0.5 to 300. The soft layer is a tin layer, an aluminum layer, a copper layer, or a gold layer.

[0036] Please refer to the following figures for an example of the printing screen of this application.

[0037] Please refer to Figures 1 to 3 This utility model discloses a printing screen 100, which includes a first metal layer 1 and a second metal layer 2. The first metal layer 1 includes a plurality of first grid lines 11, each grid line including a plurality of through-holes 111 and connecting bridges 112 located between adjacent first perforations 111. The second metal layer 2 includes a plurality of second grid lines 21, each grid line 21 including through-holes 211. The second perforations 211 and the plurality of first perforations 111 are correspondingly arranged and interconnected. The duty cycle of the first perforations 111 in the first metal layer 1 is greater than the duty cycle of the second perforations 211 in the second metal layer 2; and the thickness d1 of the first metal layer 1 is not greater than 30 micrometers, and the thickness d2 of the second metal layer 2 is not greater than 30 micrometers and not less than 3 micrometers. Thus, this printing screen 100 can effectively improve the ink application quality, thereby improving the printing quality. In other embodiments, the duty cycle of the first perforation 111 in the first metal layer 1 is equal to the duty cycle of the second perforation 211 in the second metal layer 2, which can also effectively improve the ink quality; the width of the first perforation 111 is greater than the width of the second perforation 211, so as to facilitate the control of the amount of ink.

[0038] Please refer to Figure 4 In another embodiment of this utility model, a printing screen 200 is provided, which, compared to the printing screen 100, also includes a grid 13. The printing screen 200 includes a printing surface 12 located on the first metal layer 1 and a bottom surface 22 located on the second metal layer 2. The printing surface 12 and the bottom surface 22 are arranged opposite to each other, with a first perforation 111 penetrating through the printing surface 12 and a second perforation 211 penetrating through the bottom surface 22. The grid 13 is recessed into the printing surface 12, forming a cross-shaped grooved texture structure. The recess depth of the grid 13 is less than or equal to the thickness d1 of the first metal layer 1. The grid 13 allows for effective control of the squeegee when it moves on the printing surface 12, thereby controlling ink scraping and improving printing quality.

[0039] Please refer to Figure 5 In another embodiment, the surface of the first metal layer 1 of the printing screen 300 is further provided with an AG structure 14. The AG structure is a raised or recessed structure with a height of 10nm-5μm and a width of 50nm-50μm, which can further control the doctor blade and improve the ink scraping quality.

[0040] Please refer to Figure 6 In another embodiment, the printing screen 400 further includes a flexible layer 3. The flexible layer 3 is deposited on the bottom surface 22, and a second metal layer 2 is located between the first metal layer 1 and the flexible layer 3. The thickness of the flexible layer 3 ranges from 1 μm to 10 μm, and its Mohs hardness ranges from 0.5 to 300. The flexible layer is a tin layer, an aluminum layer, a copper layer, or a gold layer. The flexible layer 3 is configured to have a low Mohs hardness, thus avoiding the risk of the silicon wafer cracking due to contact during printing, thereby improving print quality.

[0041] To make the above-described objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application have been described in detail above with reference to the accompanying drawings. Many specific details have been set forth in the above description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described above, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed above. Furthermore, the technical features of the embodiments described above can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments have been described; however, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification.

[0042] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A printing screen, characterized in that, It includes: A first metal layer includes a plurality of first gate lines, each gate line including a plurality of through-hole segments and connecting bridges located between adjacent first through-holes; A second metal layer is stacked on top of the first metal layer. The second metal layer includes a plurality of second gate lines. Each second gate line includes a through-hole. The second through-hole and the plurality of first through-holes are correspondingly disposed and interconnected with each other. Wherein, the duty cycle of the first perforation in the first metal layer is greater than or equal to the duty cycle of the second perforation in the second metal layer; the thickness of the first metal layer is not greater than 30 μm, and the thickness of the second metal layer is not greater than 30 μm and not less than 3 μm.

2. The printing screen according to claim 1, characterized in that, The width of the first perforation is greater than the width of the second perforation.

3. The printing screen according to claim 1, characterized in that, The printing screen includes a printing surface located on the first metal layer and a bottom surface located on the second metal layer, with the printing surface and the bottom surface arranged opposite to each other.

4. The printing screen according to claim 3, characterized in that, The printed surface is provided with micro-nano structures with raised and / or recessed features.

5. The printing screen according to claim 4, characterized in that, The micro / nano structure is a recessed grid, and the depth of the grid on the first metal layer is less than or equal to the thickness of the first metal layer.

6. The printing screen according to claim 5, characterized in that, The grid is formed by interlacing mesh lines, with at least one mesh line extending at an angle relative to the first grid line.

7. The printing screen according to claim 5, characterized in that, An AG structure is provided on the printed surface. The height of the AG structure ranges from 10nm to 5μm, and the width of the AG structure ranges from 50nm to 50μm.

8. The printing screen according to claim 3, characterized in that, The bottom surface is covered with a soft layer, the thickness of which is greater than or equal to 1 μm and the Mohs hardness is less than or equal to 300.

9. The printing screen according to claim 8, characterized in that, The soft layer has a thickness ranging from 1μm to 10μm and a Mohs hardness ranging from 0.5 to 300.

10. A printing screen according to claim 8, characterized in that, The soft layer is a tin layer, an aluminum layer, a copper layer, or a gold layer.

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