Screen printing plate and production method

Abstract

The invention belongs to the technical field of screen printing plates, and particularly relates to a screen printing plate and a production method. The steel belt is attached to the top of the frame, and a plurality of first through grooves are formed in the steel belt in an array mode; the thin film is attached to the bottom of the steel belt, a plurality of second through grooves are formed in the thin film in an array mode, the second through grooves correspond to the first through grooves in a one-to-one mode, the width of the second through grooves is smaller than that of the first through grooves, and the second through grooves are located in the first through grooves; in short, a first through groove is engraved in the surface of the steel belt through laser, then the steel belt is subjected to destressing treatment, then a thin film is attached to the bottom of the steel belt, primary laser engraving is carried out, a second through groove is engraved in the thin film, and the second through groove is formed in the first through groove; therefore, the conductive silver paste is finally extruded to the surface of the battery piece through the second through groove, and the width and the position degree of the grid line are ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of screen printing, and in particular relates to a screen printing plate and a production method thereof. Background Art

[0002] In the process of manufacturing solar cells, it is usually necessary to use a screen to print conductive silver paste onto the cell. The existing screen usually uses a laser to carve a number of through grooves on a steel belt, and then the conductive silver paste is coated on the steel belt. Finally, the conductive silver paste is squeezed out from the through grooves to the surface of the cell by a scraper to form grid lines. However, due to the tension of the steel belt after being tightened, the width and position of the through grooves cannot be guaranteed, resulting in deviations in the width and position of the grid lines of the cell.

[0003] Therefore, how to avoid the width and position deviation of the grid lines of the battery cell is a technical problem that needs to be solved urgently in this field. Summary of the invention

[0004] The object of the present invention is to provide a screen plate and a production method.

[0005] In order to solve the above technical problems, the present invention provides a screen, comprising: a frame; a steel belt attached to the top of the frame, wherein a plurality of first through grooves are arranged in an array on the steel belt; a film attached to the bottom of the steel belt, wherein a plurality of second through grooves are arranged in an array on the film, wherein the second through grooves correspond to the first through grooves one by one, the width of the second through grooves is smaller than the width of the first through grooves, and the second through grooves are located inside the first through grooves.

[0006] Preferably, a nylon mesh is attached to the frame, the steel belt is attached to the top of the nylon mesh, a printing notch is opened on the nylon mesh, and the film is arranged in the printing notch.

[0007] Preferably, the length of the first through groove is 10-13 mm.

[0008] Preferably, the width of the first through groove is 50-100 μm.

[0009] Preferably, the length of the second through groove is 7-10 mm.

[0010] Preferably, the width of the second through groove is 10-30 μm.

[0011] Preferably, the distance between the long side of the second through-groove and the long side of the first through-groove adjacent thereto is 10-50 μm.

[0012] Preferably, the distance between the short side of the second through-groove and the short side of the first through-groove adjacent thereto is 0-2 mm.

[0013] The present invention also includes a method for producing the above-mentioned screen, comprising the following steps: Step S1, attaching the steel belt to the frame; Step S2, carving a first through groove on the surface of the steel strip; Step S3, performing stress relief treatment on the steel strip; Step S4, attaching the film to the bottom of the steel belt; Step S5, carving into the first through groove from the upper side of the steel strip, so as to carve a second through groove on the film.

[0014] The beneficial effects of the present invention are: The first through-groove is firstly engraved on the surface of the steel strip by laser, and then the steel strip is subjected to stress relief treatment. Then, a film is attached to the bottom of the steel strip, and laser engraving is performed again to engrave the second through-groove on the film. The second through-groove is opened inside the first through-groove, so that the conductive silver paste is finally squeezed out to the surface of the battery cell through the second through-groove, ensuring the width and position of the grid line.

[0015] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practicing the present invention.

[0016] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 is a top view of a preferred embodiment of the screen of the present invention; Figure 2 is a partial cross-sectional view of a preferred embodiment of a steel strip and a film of the present invention; Figure 3 It is a partial top view of a preferred embodiment of the steel strip and film of the present invention.

[0019] In the figure: 1. Frame; 11. Nylon net; 2. steel belt; 21. first through groove; 3. Film; 31. Second through groove. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] like Figures 1 to 3 As shown, at least one embodiment provides a screen, comprising: a frame 1; a steel strip 2 attached to the top of the frame 1, wherein the steel strip 2 is provided with a plurality of first through grooves 21 in an array; a film 3 attached to the bottom of the steel strip 2, wherein the film 3 is provided with a plurality of second through grooves 31 in an array, wherein the second through grooves 31 correspond to the first through grooves 21 one by one, the width of the second through grooves 31 is smaller than the width of the first through grooves 21, and the second through grooves 31 are located inside the first through grooves 21; in short, the first through grooves 21 are firstly engraved on the surface of the steel strip 2 by laser, and then the steel strip 2 is de- After stress treatment, a film 3 is attached to the bottom of the steel strip 2, and laser engraving is performed to engrave a second through-groove 31 on the film 3, and the second through-groove 31 is opened inside the first through-groove 21, so that the conductive silver paste is finally squeezed out to the surface of the battery cell through the second through-groove 31, ensuring the width and position of the grid line; further, the film 3 can be selected from polymer films 3 (such as PI films, polyester films 3, polyethylene films 3, etc.) or metal films 3 (such as aluminum films, stainless steel films, etc.), among which PI films are preferred, which have good wear resistance, are not easy to tear, and the thickness can be controlled between 2-15um.

[0022] In some embodiments, a nylon mesh 11 is attached to the frame 1, the steel belt 2 is attached to the top of the nylon mesh 11, a printing notch is opened on the nylon mesh 11, and the film 3 is arranged in the printed notch. In short, the nylon mesh 11 is attached to the frame 1, and then the steel belt 2 is attached to the nylon mesh 11. After it is shaped, a notch is cut on the nylon mesh 11 to attach the film 3.

[0023] In some embodiments, the length of the first through-groove 21 is 10-13 mm; the width of the first through-groove 21 (ie, L1) is 50-100 μm; in short, the length and width of the first through-groove 21 are determined by the gate line, but the length of the first through-groove 21 should be slightly larger than the gate line, and its width should be slightly larger than the gate line.

[0024] In some embodiments, the length of the second through-groove 31 is 7-10 mm, and the width of the second through-groove 31 (ie, L2) is 10-30 μm; in short, the length of the second through-groove 31 is equal to the length of the gate line, and the width of the second through-groove 31 is equal to the length of the gate line.

[0025] In some embodiments, the distance between the long side of the second through-groove 31 and the long side of the first through-groove 21 adjacent thereto (i.e., L3) is 10-50 μm; in short, if the distance between the long side of the second through-groove 31 and the long side of the first through-groove 21 adjacent thereto is too large, the conductive silver paste will exert too much pressure on the film 3, thereby causing deformation of the grid lines at the printing location, while if the distance is too small, there will not be enough distance left to carve the second through-groove 31 of the lamp on the film 3 after the stress relief deformation of the steel strip 2.

[0026] In some embodiments, the spacing between the short side of the second through groove 31 and the short side of the first through groove 21 adjacent thereto is 0-2 mm; in short, a distance needs to be reserved between the short side of the second through groove 31 and the short side of the first through groove 21 adjacent thereto to adjust the longitudinal distance of the second through groove 31.

[0027] At least one embodiment further provides a method for producing the above-mentioned screen, comprising the following steps: Step S1, attaching the steel belt 2 to the frame 1, specifically, the nylon mesh 11 is first tightened and then attached to the frame 1 by glue, and then the steel belt 2 is tightened and attached to the nylon mesh 11 by glue, and after the nylon mesh 11 and the steel belt 2 are formed, a notch is cut and printed on the nylon mesh 11; Step S2, carving a first through groove 21 on the surface of the steel strip 2; Step S3, performing stress relief treatment on the steel strip 2; Step S4, attaching the film 3 to the bottom of the steel belt 2, specifically, attaching the film 3 to the printed notch; Step S5 , carving into the first through groove 21 from the upper side of the steel strip 2 , so as to carve out a second through groove 31 on the film 3 .

[0028] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are 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 therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0030] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A screen, characterized in that: include: Frame (1); A steel belt (2) attached to the top of the frame (1), wherein a plurality of first through grooves (21) are arranged in an array on the steel belt (2); A film (3) attached to the bottom of the steel strip (2), wherein a plurality of second through grooves (31) are arranged in an array on the film (3), wherein The second through-groove (31) corresponds one-to-one to the first through-groove (21); the width of the second through-groove (31) is smaller than the width of the first through-groove (21); and the second through-groove (31) is located inside the first through-groove (21).

2. The screen plate according to claim 1, characterized in that: The frame (1) is attached with a nylon mesh (11), the steel belt (2) is attached to the top of the nylon mesh (11), and the nylon mesh (11) is provided with a printed notch, and The film (3) is arranged in the printing notch.

3. The screen plate according to claim 1, characterized in that: The length of the first through groove (21) is 10-13 mm.

4. The screen plate according to claim 1, characterized in that: The width of the first through groove (21) is 50-100 μm.

5. The screen plate according to claim 1, characterized in that: The length of the second through groove (31) is 7-10 mm.

6. The screen plate according to claim 1, wherein: The width of the second through groove (31) is 10-30 μm.

7. The screen plate according to claim 1, characterized in that: The distance between the long side of the second through-groove (31) and the long side of the first through-groove (21) adjacent thereto is 10-50 μm.

8. The screen plate according to claim 1, wherein: The distance between the short side of the second through-groove (31) and the short side of the first through-groove (21) adjacent thereto is 0-2 mm.

9. A method for producing a screen as claimed in any one of claims 1 to 8, characterized in that: The steps include: Step S1, attaching the steel strip (2) to the frame (1); Step S2, carving a first through groove (21) on the surface of the steel strip (2); Step S3, performing stress relief treatment on the steel strip (2); Step S4, attaching the film (3) to the bottom of the steel strip (2); Step S5: Carving into the first through groove (21) from the upper side of the steel strip (2) so as to carve a second through groove (31) on the film (3).

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