Integrated screen printing plate structure

Abstract

The invention relates to the technical field of screen printing plates, and particularly discloses an integrated screen printing plate structure which comprises a nickel alloy screen plate (10), a plurality of main grids (20) arranged on the nickel alloy screen plate (10) and a plurality of auxiliary grids (30) perpendicularly staggered with the main grids (20). The plurality of auxiliary grids (30) are arranged at equal intervals; the nickel alloy screen plate is adopted, the main grid and the auxiliary grid are jointly arranged on the nickel alloy screen plate, printing of the main grid and the auxiliary grid can be completed at a time through one screen plate, labor cost is greatly reduced, production efficiency is improved, meanwhile, a lap joint body is adopted when the main grid and the auxiliary grid are in lap joint, and the thickness of the main grid and the thickness of the auxiliary grid are different. The height of the silver paste can be controlled and adjusted, the problem of poor lap joint of joint points during printing of main and auxiliary grids is solved, and the wet weight of the paste is controlled.

Description

Technical Field

[0001] The present invention relates to the technical field of screen plates, and particularly to an integrated screen plate structure. Background Art

[0002] A screen plate is an important tool for screen printing, and can be said to be an important foundation for screen printing. It is mainly woven by a screen plate made of metal material with main grids and sub-grids intersecting. After being opened with a certain tension, it is fixed on a screen frame. In addition to forming graphic circuits, the function of the screen plate can also control the amount of ink penetrated during screen printing. Therefore, the screen plate has a very great influence on the printing precision, ink thickness, and ink penetration amount.

[0003] Screen plate technology has the advantages of a simple process, a large graphic design space, and suitability for large-scale production, and has become a technology widely used in the electronic field. Taking the solar cell field as an example, the screen plate is an important tool for printing the electrodes of solar cells. A screen plate generally includes a screen frame and a screen mesh stretched within the screen frame. Conductive paste is poured onto the screen plate, and a squeegee is used to drive the conductive paste to move on the screen mesh, so that the conductive paste is extruded onto the solar cell through the mesh holes on the screen mesh, forming corresponding patterns on the solar cell to form the electrodes of the solar cell.

[0004] Existing metal screen plates are divided into main grid line screen plates and sub-grid line screen plates. During printing, the main grid lines and sub-grid lines need to be printed separately, and finally sintered and welded to form the final circuit. The printing process is not only time-consuming and laborious, but also poor lap joint is likely to occur at the intersection of the main grid lines and sub-grid lines, resulting in an open circuit. At present, although there are laser screen plates that can be used as substitutes for the existing screen plates formed by the intersection of main and sub-grid lines in the industry, however, the structural strength of the laser screen plates cannot meet the requirements in the industry. The laser screen plates cannot control the printing thickness differently and must rely on additional support structures, having the disadvantages of high cost and poor lap joint. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide an integrated screen plate structure. This integrated screen plate structure can not only interweave the main and sub-grid lines on one screen plate, but also has a simple structure, low cost, and no problem of poor lap joint.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] An integrated screen plate structure, comprising: a nickel alloy screen plate, a plurality of main grids arranged on the nickel alloy screen plate, and a plurality of sub-grids arranged vertically and alternately with the main grids; the plurality of sub-grids are arranged at equal intervals.

[0008] Preferably, the main grid includes a pair of harpoon openings, a main grid line disposed between the pair of harpoon openings, a plurality of pads disposed on the main grid line, and a plurality of overlapping bodies provided between adjacent pads; the number of the overlapping bodies is equal to the number of the secondary grids.

[0009] Preferably, the main grid line includes a main plate grid wire groove, main film layers disposed on both sides of the main plate grid wire groove, two main yarn layers disposed on the main film layers, and a main ink storage groove disposed between the main yarn layers; the main ink storage groove is disposed above the main plate grid wire groove.

[0010] Preferably, the overlapping body includes an overlapping member and widening members disposed at both ends of the overlapping member.

[0011] Preferably, the secondary grid includes a plurality of secondary grid lines, and a break is provided between adjacent secondary grid lines; the adjacent two secondary grid lines are connected through the overlapping body which is laid on the break.

[0012] Preferably, the secondary grid line includes a secondary plate grid wire groove, two secondary film layers disposed between the secondary plate grid wire grooves, a secondary yarn layer disposed on the secondary film layers, and a secondary ink storage groove disposed between the secondary yarn layers; the secondary ink storage groove is disposed on the secondary plate grid wire groove.

[0013] Preferably, the thickness of the main grid is 5 - 50 μm.

[0014] Preferably, the thickness of the secondary grid is 5 - 50 μm.

[0015] Preferably, the length of the overlapping member is 500 - 1000 μm, and the width is 10 - 150 μm.

[0016] Preferably, the length of the widening member is 10 - 300 μm, and the width is 10 - 40 μm.

[0017] Compared with the prior art, the present application has the following beneficial effects:

[0018] The present invention uses a nickel alloy mesh plate, and the main grid and the secondary grid are jointly provided on the nickel alloy mesh plate. Through one mesh plate, the printing of the main grid and the secondary grid can be completed at one time, greatly reducing the labor cost and improving the production efficiency. At the same time, when the main grid and the secondary grid overlap, an overlapping body is used. By using the different thicknesses of the main grid and the secondary grid, the height of the silver paste can be controlled and adjusted, solving the problems of poor overlap at the intersection point during the printing of the main and secondary grids and the control of the wet weight of the paste. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present invention and do not limit the present invention.

[0020] Figure 1 Structural schematic diagram of the integrated stencil structure of the present invention;

[0021] Figure 2 is Figure 1 Structural schematic diagram of the nickel alloy mesh plate and the main grid in

[0022] Figure 3 is Figure 2 Structural schematic diagram of the main grid in

[0023] Figure 4 is Figure 3 A - A sectional structural schematic diagram of

[0024] Figure 5 is Figure 3 Structural schematic diagram of the overlapping body in

[0025] Figure 6 is Figure 1 Structural schematic diagram of the nickel alloy mesh plate and the secondary grid in

[0026] Figure 7 is Figure 6 Structural schematic diagram of the secondary grid in

[0027] Figure 8 is Figure 7 B - B sectional structural schematic diagram of Detailed implementation manners

[0028] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. Components of the embodiments of the present invention described and illustrated in the drawings here can be arranged and designed in various different configurations. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0029] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0030] Unless otherwise defined, the technical terms or scientific terms used in this patent document shall have the ordinary meanings understood by those of ordinary skill in the art to which the present invention pertains. The terms "first", "second" and similar words used in the description and claims of this invention patent do not denote any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "a", "an" or "the" do not denote a quantity limitation, but mean that there is at least one. Words such as "comprising" or "including" mean that the elements or objects appearing before "comprising" or "including" cover the elements or objects listed after "comprising" or "including" and their equivalents, and do not exclude other elements or objects. Terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0031] The following will, with reference to the accompanying drawings, elaborate on some embodiments of the present invention. Without conflict, the features in the following embodiments can be combined with each other.

[0032] Embodiment 1:

[0033] As Figure 1 、 Figure 2 and Figure 6 shown, the integrated stencil structure includes: a nickel alloy stencil plate 10, a plurality of main grids 20 provided on the nickel alloy stencil plate 10, and a plurality of sub-grids 30 arranged perpendicular and staggered with the main grids 20; the plurality of sub-grids 30 are arranged at equal intervals.

[0034] By simultaneously opening the main grids 20 and the sub-grids 30 on a single nickel alloy stencil plate 10 to form a stencil with the main grids 20 and the sub-grids 30 integrated, when printing the battery cells with this stencil, only one printing is required to complete the patterns of the main grids 20 and the sub-grids 30. Compared with the prior art, the number of printings is reduced and the labor cost is lowered.

[0035] At the same time, in the prior art, the main grids 20 and the sub-grids 30 are printed separately, and when they are joined, poor lap joint is likely to occur, resulting in an open circuit. Therefore, by simultaneously opening the main grids 20 and the sub-grids 30 on a single nickel alloy stencil plate 10, the problem of poor lap joint is solved through the self-structures of the main grids 20 and the sub-grids 30 at the intersection points of the main grids 20 and the sub-grids 30.

[0036] The problem of poor lap joint is mainly caused by the tension during the process of printing and stretching the screen, which will cause the ink to be pulled in all directions. In the prior art, during the separate printing processes of the main grid 20 and the secondary grid 30, since the ink thickness at the joint point is the same as that around, but the tension coming from the joint point is the combined effect of the main grid 20 and the secondary grid 30, so at this place, problems such as poor lap joint and disconnection are extremely likely to occur.

[0037] To solve the above problems, further, as Figure 3 shown, the main grid 20 includes a pair of harpoon openings 21, a main grid line 22 arranged between the pair of harpoon openings 21, a plurality of pads 23 arranged on the main grid line 22, and a plurality of lap joints 24 arranged between adjacent two pads 23; the number of the lap joints 24 is equal to the number of the secondary grid 30.

[0038] The main grid 20 includes a pair of harpoon openings 21, and a main grid line 22 is arranged between the two harpoon openings 21, and the main grid line 22 forms longitudinal lines on the battery; when stretching the screen, the tension on the main grid 20 will be transmitted from the main grid line 22 to the two harpoon openings 21, and the harpoon openings 21 are more likely to deform than a straight line, so as to release the tension.

[0039] A plurality of pads 23 are arranged on the main grid line 22, and the number of the pads 23 is determined according to actual needs and is not limited in this embodiment. When printing, the pads 23 have the function of conducting current.

[0040] A plurality of lap joints 24 are arranged between the two pads 23. The lap joints 24 are arranged at the joint point of the main grid 20 and the secondary grid 30, mainly for connecting the main grid 20 and the secondary grid 30 to increase the connection strength at the joint point; when printing the main grid 20 and the secondary grid 30 at one time, the lap joints 24 have the functions of increasing additional ink storage grooves and enlarging the plate pattern grooves, and can increase the adhesion amount of the silver paste at the joint point, and can effectively prevent the occurrence of poor lap joint even under the action of tension.

[0041] As Figure 4 shown, the main grid line 22 includes a main plate grid line groove 221, main film layers 222 arranged on both sides of the main plate grid line groove 221, two main yarn layers 223 arranged on the main film layers 222, and a main ink storage groove 224 arranged between the main yarn layers 223; the main ink storage groove 224 is arranged above the main plate grid line groove 221.

[0042] The main grid line 22 includes a main plate grid line groove 221. The shape of the main plate grid line groove 221 is the shape of the printed pattern of the main grid line 22, and its thickness is determined by the thickness of the main film layers 222 on both sides of the main plate grid line groove 221. According to the thickness of the main film layers 222, the thickness of the printed pattern can be obtained.

[0043] As shown Figure 5 in the figure, the overlapping body 24 includes an overlapping member 241 and widening members 242 provided at both ends of the overlapping member 241.

[0044] The overlapping body 24 includes an overlapping member 241. The length of the overlapping member 241 is 500 - 1000 μm, and the width is 10 - 150 μm. According to the prior art, the width of the existing auxiliary grid 30 is 8 ± 1.5 μm. By using the overlapping member 241, the line width at the junction of the main grid 20 and the auxiliary grid 30 is greatly increased. The length direction of the overlapping member 241 is the same as the direction of the auxiliary grid 30. In this way, the width of the auxiliary grid 30 at the junction is increased in a different direction, which also increases the width of the silver paste after printing. When stretching the screen, the situation of poor overlapping due to the too narrow line width of the auxiliary grid 30 at the junction can be avoided.

[0045] Widening members 242 are provided at both ends of the overlapping member 241. The length of the widening member 242 is 10 - 300 μm, and the width is 10 - 40 μm. The design of the widening member 242 is a measure to prevent the auxiliary grid 30 that dries first from shifting due to too much silver paste at the junction before the silver paste dries, resulting in an open circuit. The widening member 242 can effectively prevent an open circuit situation after the auxiliary grid 30 shifts.

[0046] As shown Figure 7 in the figure, the auxiliary grid 30 includes a plurality of auxiliary grid lines 31, and a break 32 is provided between adjacent two auxiliary grid lines 31; the adjacent two auxiliary grid lines 31 are connected through the overlapping body 24 and are laid on the break 32.

[0047] The auxiliary grid 30 includes a plurality of auxiliary grid lines 31. The number of the auxiliary grid lines 31 is determined according to the actual situation and is not limited in this embodiment. The auxiliary grid lines 31 form horizontal lines on the battery.

[0048] A break 32 is provided between adjacent two auxiliary grid lines 31. The reason for dividing the auxiliary grid 30 into multiple auxiliary grid lines 31 is to effectively release the tension from the break 32 during screen printing; the break 32 is filled by the overlapping body 24. When the auxiliary grid lines 31 on both sides of the break 32 release tension to the break 32, this tension can also be used as the power of the silver paste in the overlapping body 24 to push the silver paste in the overlapping body 24 towards the junction point of the main grid 20 and the auxiliary grid 30, increasing the connecting paste at the junction point, and more effectively preventing the situation of poor overlapping.

[0049] As shown Figure 8As shown, the auxiliary grid line 31 includes an auxiliary grid line groove 311, two auxiliary film layers 312 arranged between the auxiliary grid line grooves 311, an auxiliary yarn layer 313 arranged on the auxiliary film layer 312, and an auxiliary ink storage tank 314 arranged between the auxiliary yarn layers 313; the auxiliary ink storage tank 314 is arranged on the auxiliary grid line groove 311.

[0050] The secondary grid line 31 includes a secondary grid line groove 311. The shape of the secondary grid line groove 311 is the shape of the transverse grain of the battery. The thickness of the secondary grid line groove 311 is determined by the thickness of the secondary film layer 31. The thickness of the secondary grid line groove 311 is thicker than the thickness of the main grid line groove 221, which also prevents poor overlap during the printing process.

[0051] Furthermore, the main grid 20 has a thickness of 5-50 μm.

[0052] Furthermore, the thickness of the secondary grid 30 is 5-50 μm.

[0053] During screen printing, silver paste is poured onto the screen, and a scraper is used to move the silver paste on the main yarn layer 223 and the auxiliary yarn layer 313, so that the silver paste gathers in the main ink storage tank 224 and the auxiliary ink storage tank 314 on the main yarn layer 223 and the auxiliary yarn layer 313, and then flows to the main grid line groove 221 and the auxiliary grid line groove 311 under the main ink storage tank 224 and the auxiliary ink storage tank 314, and is finally squeezed onto the solar cell to form a circuit pattern provided by the main grid 20 and the auxiliary grid 30, completing the one-time printing of the main grid 20 and the auxiliary grid 30, reducing the number of printing times and improving the printing efficiency.

[0054] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

Claims

1. Integrated screen structure, characterized by: include: A nickel alloy mesh plate (10), a plurality of main grids (20) arranged on the nickel alloy mesh plate (10), and a plurality of auxiliary grids (30) arranged vertically and staggered with the main grids (20); the plurality of auxiliary grids (30) are arranged at equal intervals.

2. The integrated screen structure according to claim 1, characterized in that: The main grid (20) comprises a pair of harpoon openings (21), a main grid line (22) arranged between the pair of harpoon openings (21), a plurality of welding pads (23) arranged on the main grid line (22), and a plurality of overlapping bodies (24) arranged between two adjacent welding pads (23); the number of the overlapping bodies (24) is equal to the number of the auxiliary grids (30).

3. The integrated screen structure according to claim 2, characterized in that: The main grid line (22) comprises a main grid line groove (221), main film layers (222) arranged on both sides of the main grid line groove (221), two main yarn layers (223) arranged on the main film layer (222), and a main ink storage groove (224) arranged between the main yarn layers (223); the main ink storage groove (224) is arranged above the main grid line groove (221).

4. The integrated screen structure according to claim 2, characterized in that: The bridging body (24) comprises a bridging piece (241) and widening pieces (242) arranged at both ends of the bridging piece (241).

5. The integrated screen structure according to claim 3, characterized in that: The auxiliary grid (30) comprises a plurality of auxiliary grid lines (31), and a break (32) is provided between two adjacent auxiliary grid lines (31); the two adjacent auxiliary grid lines (31) are connected by being laid on the break (32) via a bridging body (24).

6. The integrated screen structure according to claim 5, characterized in that: The secondary grid lines (31) include secondary grid line grooves (311), two secondary film layers (312) arranged between the secondary grid line grooves (311), secondary yarn layers (313) arranged on the secondary film layers (312), and secondary ink storage grooves (314) arranged between the secondary yarn layers (313); the secondary ink storage grooves (314) are arranged on the secondary grid line grooves (311).

7. The integrated screen structure according to claim 1, characterized in that: The main grid (20) has a thickness of 5-50 μm.

8. The integrated screen structure according to claim 1, characterized in that: The thickness of the secondary grid (30) is 5-50 μm.

9. The integrated screen structure according to claim 4, characterized in that: The bridging piece (241) has a length of 500-1000 μm and a width of 10-150 μm.

10. The integrated screen structure according to claim 9, characterized in that: The expansion member (242) has a length of 10-300 μm and a width of 10-40 μm.

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