Printing steel plate capable of eliminating tension difference

Abstract

The utility model discloses a printing steel plate capable of eliminating tension difference, which comprises a printing plate frame and a printing steel plate, the printing steel plate is tensioned on the printing plate frame through a tensioning wire mesh, the plate surface of the printing steel plate comprises a printing area and tension balance areas, and the tension balance areas are positioned on two sides of the printing area; the printing area is provided with a plurality of steel plate wire grooves, the steel plate wire grooves comprise material containing wire grooves and scraping and printing wire grooves, and the scraping and printing wire grooves are located in the bottoms of the material containing wire grooves. The tension balance area is provided with an arc-shaped tension balance groove or / and a hole-shaped tension balance groove, and the arc-shaped tension balance groove or / and the hole-shaped tension balance groove of a through groove structure is / are filled with an elastic filling structure. The circle centers of circles where the outer side arc groove edges and the inner side arc groove edges of the arc-shaped tension balance grooves are located are located on the symmetric lines of the adjacent steel plate wire grooves. And at least one plate surface of the tension balance area is coated with a tension balance coating. According to the printing steel plate, the tension adaptation performance of the steel plate in the scraping and pressing process of a scraper is improved, and accurate printing of electrode grid lines is facilitated.

Description

Technical Field

[0001] This utility model relates to a printing template for high-precision conductive electrode grid lines of solar photovoltaic cells, and more particularly to a precision printing template structure for a thin metal substrate. Background Technology

[0002] Solar photovoltaic cells are designed with extremely fine, micro-grid electrodes. The more precise the grid lines on the cell, the higher its power generation efficiency. However, the structure and manufacturing process of traditional screen printing stencils for such precise grid lines have reached their limits, making further breakthroughs difficult. Therefore, in recent years, thin metal substrates have emerged as printing stencils for photovoltaic cells, replacing the traditional metal screen. These stencils eliminate the knots created by the alternating warp and weft threads of traditional screen printing, significantly increasing the opening ratio of the printing template, improving ink penetration, and effectively reducing manufacturing costs. This facilitates the miniaturization of the battery grid electrodes.

[0003] Although stencil printing has its own advantages over screen printing, the tension changes on the surface of the stencil during the squeegee printing process can have a very negative impact on the printing quality. When the squeegee scrapes the silver paste into the printing groove from the printing direction, the tension on both sides of the printing groove changes continuously as the squeegee moves. This constantly changing tension of the stencil creates uneven tension on both sides of the printing groove, which can actually cause deformation and warping of the printing groove shape. This directly affects the appearance of the printed grid lines corresponding to the groove and the integrity of the grid line pattern. It can also cause paste splashing, diffusion, and uneven thickness at the edges of the printing groove, resulting in defects such as broken or uneven line height and thickness of the printed grid line electrodes. This increases the impedance of the electrode pattern and reduces the conversion efficiency of the solar cell. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the existing technology, the technical problem to be solved by this utility model is to provide a printing steel plate that can eliminate tension differences. This printing steel plate can improve the adaptability of the steel plate tension during the squeegee scraping process and avoid deformation and curling of the printing grooves of the steel plate.

[0005] To solve the above-mentioned technical problems, the present invention provides a printing plate capable of eliminating tension differences, comprising a printing plate frame and a printing plate. The printing plate is tensioned on the printing plate frame by a tensioning wire mesh. The surface of the printing plate includes a printing area and a tension balancing area, with the tension balancing area located on both sides of the printing area. The printing area is provided with several steel plate grooves, including material-containing grooves and scraping grooves, with the scraping grooves located at the bottom of the material-containing grooves. The tension balancing area is provided with arc-shaped tension balancing grooves and / or perforated tension balancing grooves, and the arc-shaped tension balancing grooves and / or perforated tension balancing grooves, which have a through-groove structure, are filled with an elastic filling structure. The width of the tensioning wire mesh between one side of the printing plate with the tension balancing area and the printing plate frame is L1, and the width of the tensioning wire mesh between the other side of the printing plate and the printing plate frame is L2, where L2 > L1.

[0006] Preferably, the groove width A1 of the squeegee groove is between 0.008mm and 0.015mm; the groove width of the squeegee groove is A1, and the groove width of the material receiving groove is A2, where A2 = (10-20)A1.

[0007] Preferably, the steel plate groove is arranged along the scraping direction of the squeegee; the material-containing groove is a flat-bottomed groove.

[0008] Preferably, the radius of the circle containing the outer edge of the arc-shaped tension balancing groove is R2, and the radius of the circle containing the inner edge of the arc-shaped tension balancing groove is R1, where R2 > R1.

[0009] Preferably, the centers of the circles containing the outer and inner arcuate groove edges of the arcuate tension balance groove are both located on the symmetrical lines of the adjacent steel plate grooves.

[0010] Preferably, the orifice-shaped tension balancing groove includes at least one row of through grooves, which are circular, rectangular, or triangular through grooves.

[0011] Preferably, at least one plate of the tension balancing zone is covered with a tension balancing coating, which covers the arc-shaped tension balancing groove and the perforated tension balancing groove.

[0012] Preferably, the arc-shaped tension balancing groove and the perforated tension balancing groove are arranged along the direction of the doctor blade printing, and the arc-shaped tension balancing groove is located inside the perforated tension balancing groove.

[0013] Preferably, the elastic filling structure is filled with silicone rubber, thermoplastic elastomer, or hydrogel.

[0014] Preferably, the tension wire mesh L2 = (1.5-2.5)L1; the printing plate is a thin metal plate with a thickness h1 = 0.01mm-0.03mm.

[0015] In the above structure, because arc-shaped tension balancing grooves and perforated tension balancing grooves are set in the tension balance area of ​​the printing plate, when the squeegee moves along the longitudinal direction of the printing grooves on the plate during printing, the squeegee will generate scraping tension on the grooves. This scraping tension will pull on the groove edges, causing deformation or warping of the groove edges. Moreover, this tension will change from small to large and then back to small along the longitudinal direction of the grooves. The tension balancing grooves compensate for this tension by the elastic effect of the elastic filling structure in the grooves, thus offsetting the tearing effect of this tension on the grooves and reducing or even avoiding deformation and warping of the groove edges. In particular, the use of arc-shaped tension balancing grooves, where the groove width at both ends is greater than the middle groove width, and the groove width is positively correlated with the compensation effect formed by its elastic deformation, can effectively compensate for and offset the uneven changes in the longitudinal direction of the grooves during the scraping process, thereby effectively suppressing and avoiding groove deformation. Since the steel plate groove includes a material-containing groove and a squeegee groove, and the squeegee groove is located at the bottom of the material-containing groove, a stepped opening material-containing structure is formed. In this way, when the squeegee is squeegeeing, the paste in the material-containing groove cavity can be printed onto the printing substrate through the squeegee groove with a certain printing pressure. This effectively improves the penetration and adhesion of the paste, and makes the paste thickness easy to control, ensuring the regularity and continuity of the printed circuit electrodes. Furthermore, because the printing plate uses unequal width tensioned wire mesh on both perpendicular sides, and the width of the tensioned wire mesh on the squeegee's pressing path is greater than that on the other side, it generates more elasticity in the pressing path direction than in the other direction. During the squeegee's pressing process, the grooves can more easily adhere to the battery substrate under the action of the squeegee, achieving precise printing. Moreover, the printing plate rebounds more quickly and reliably after printing. More importantly, this unequal width tensioned wire mesh setting can also effectively reduce the change in tension force in the width direction of the grooves, suppress and avoid deformation and warping of the grooves, prevent ink leakage caused by groove deformation, and ensure the precise printing of fine grid lines. Attached Figure Description

[0016] The present invention, a printing plate capable of eliminating tension differences, will be further described below with reference to the accompanying drawings and specific embodiments.

[0017] Figure 1 This is a schematic diagram of a specific embodiment of the printing steel plate of this utility model that can eliminate tension differences;

[0018] Figure 2 yes Figure 1 A schematic diagram of the cross-sectional structure;

[0019] Figure 3 yes Figure 1 A schematic diagram of the printing plate structure in the illustrated embodiment;

[0020] Figure 4 yes Figure 3 Enlarged view of the A-A section of the steel plate cable tray;

[0021] Figure 5 yes Figure 3 An enlarged view of a specific structure in the B-B cross-section of a tension-balanced structure;

[0022] Figure 6 yes Figure 3 An enlarged view of another specific structure in the B-B section of the tension balance structure;

[0023] Figure 7 yes Figure 3 Top view of the tension-balanced structure.

[0024] In the diagram, 1—printing plate frame, 2—tensioning wire mesh, 3—printing steel plate, 31—printing area, 32—tension balance area, 4—steel plate groove, 41—scraper groove, 42—material groove, 5—arc-shaped tension balance groove, 6—perforated tension balance groove, 7—tension balance coating. Detailed Implementation

[0025] like Figure 1 , Figure 2 and Figure 3 The printing plate shown eliminates tension differences. The printing plate frame 1 is a rectangular frame made of aluminum alloy. A window for stretching the printing plate 3 and the tensioning wire mesh 2 is set at the center of the printing plate frame 1. The printing plate 3 is stretched to the bottom side of the printing plate frame 1 by the tensioning wire mesh 2. The outer perimeter of the printing plate 3 and the inner edge of the window of the tensioning wire mesh 2 are glued together by adhesive. The tensioning wire mesh 2 is a polyester wire mesh in the shape of a U-shape. The printing plate 3 is a rectangular stainless steel sheet with a thickness of h1 = 0.026 mm. The distance from one of the two adjacent vertical sides of the rectangular stainless steel sheet to the printing plate frame 1 is the width L1 of the tensioning wire mesh 2 on that side, and the distance from the other side to the printing plate frame 1 is the width L2 of the tensioning wire mesh 2 on that side, where L2 > L1. In this embodiment, L2 = 5 cm and L1 = 2 cm; preferably, L2 of the tensioning wire mesh 2 is (1.5-2.5)L1. The printing plate 3 can also be other thin metal sheets.

[0026] Several rows of grooves 4 are provided on the printing plate 3, and each row includes several grooves 4. The grooves 4 are located within the printing area 31 of the printing plate 3. Tension balancing areas 32 are also provided on both sides of the printing area 31, and are also located on the printing plate 3. The tension balancing areas 32 are rectangular strip-shaped areas. The longitudinal direction of both the grooves 4 and the tension balancing areas 32 is parallel to the direction of the doctor blade's scraping movement. Figure 1 The direction of the middle arrow is consistent with that of the squeegee, which moves along the longitudinal direction of the steel plate groove 4 to achieve the printing of the paste.

[0027] Several friction-increasing damping points 5 are densely distributed in the area between two adjacent columns of steel plate grooves 4. Tension balancing zones 32 on both sides of the printing steel plate 3 are provided with a number of tension stabilizing blocks equal to the number of steel plate grooves 4 in each column. Each tension balancing block includes an arc-shaped tension balancing groove 6 and two columns of perforated tension balancing grooves 7, with the arc-shaped tension balancing groove 6 located inside the perforated tension balancing grooves 7. The longitudinal direction of both the arc-shaped tension balancing groove 6 and the perforated tension balancing grooves 7 is arranged along the squeegee printing direction.

[0028] Figure 4 An enlarged cross-sectional view of a steel plate groove 4 is shown, where the thickness of the printing steel plate 3 is h1 = 0.026 mm. The steel plate groove 4 includes a material-containing groove 42 located on the printing side and a printing groove 41 located on the application side, i.e., the printing groove 41 is located at the bottom of the material-containing groove 42. The printing paste is printed onto the battery substrate by the scraper through the material-containing groove 42 and the printing groove 41 to form electrode grid lines. The material-containing groove 42 and the printing groove 41 are of equal length. The width of the printing groove 41 is A1 = 8 μm, and the material-containing groove 42 is a flat-bottomed groove with a width A2 = 120 μm; the depth of the material-containing groove 42 is h2 = 0.013 mm. Preferably, A2 = (10-20)A1, and h2 = (2 / 5-3 / 5)h1.

[0029] Figure 5 An enlarged cross-sectional view of a tension balancing groove is shown. From the inside out, the diagram shows an arc-shaped tension balancing groove 5 and a row of perforated tension balancing grooves 6 with rectangular holes. The arc-shaped tension balancing groove 5 is a through groove with arc-shaped edges, and the perforated tension balancing grooves 6 are also through-hole grooves. An elastic filling structure, made of elastic materials such as silicone rubber, thermoplastic elastomers, or hydrogels, fills the cavity of the through grooves.

[0030] Figure 6 An enlarged cross-sectional view of another tension balancing groove is shown, which differs from the above embodiment in that: the arc-shaped tension balancing groove 5 and the perforated tension balancing groove 6 of the printing plate 3 are filled with an elastic filling structure, and tension balancing coating 7 is covered on both surfaces of the corresponding printing plate 3. This tension balancing coating 7 is a high-temperature adhesive tape layer or a polyimide adhesive tape layer. Alternatively, the tension balancing coating 8 can be covered on one surface of the printing plate 3 at both ends of the arc-shaped tension balancing groove 5 and the perforated tension balancing groove 6, such as the upper or lower surface.

[0031] like Figure 3 and Figure 7As shown, each steel plate groove 4 corresponds to an arc-shaped tension balancing groove 5. Outside the arc-shaped tension balancing groove 5, a row of rectangular hole-shaped tension balancing grooves 6 and a row of circular hole-shaped tension balancing grooves 6 are arranged sequentially. The end of the arc-shaped tension balancing groove 5 is longer than the end of the corresponding steel plate groove 4, with a longitudinal difference a = 2 mm between the two ends. The radius of the circle containing the outer groove side of the arc-shaped tension balancing groove 5 is R2, and the radius of the circle containing the inner groove side is R1. To ensure that the groove width at both ends of the arc-shaped tension balancing groove 5 is greater than the groove width in the middle, R2 > R1. Furthermore, the centers of the circles containing the outer and inner arc-shaped groove sides are located on the line of symmetry between adjacent steel plate grooves 4. In this embodiment, R2 = 2R1.

[0032] The above are only some preferred embodiments of this utility model, but this utility model is not limited thereto, and many improvements and modifications can be made. Any improvements and modifications made based on the basic principles of this utility model should be considered to fall within the protection scope of this utility model.

Claims

1. A printing plate capable of eliminating tension differences, comprising a printing plate frame (1) and a printing plate (3), wherein the printing plate (3) is stretched onto the printing plate frame (1) by a tensioning wire mesh (2), characterized in that: The printing plate (3) includes a printing area (31) and a tension balance area (32), with the tension balance area (32) located on both sides of the printing area (31). The printing area (31) is provided with several plate grooves (4), each of which includes a material-containing groove (42) and a scraping groove (41), with the scraping groove (41) located at the bottom of the material-containing groove (42). The tension balance area (32) is provided with an arc-shaped tension balance groove (5) and / or a hole-shaped tension balance groove (6), and the arc-shaped tension balance groove (5) and / or a hole-shaped tension balance groove (6) having a through-groove structure is filled with an elastic filling structure. The width of the tension wire mesh (2) between one side of the printing plate (3) with the tension balance area (32) and the printing plate frame (1) is L1, and the width of the tension wire mesh (2) between the other side of the printing plate (3) and the printing plate frame (1) is L2, where L2 > L1.

2. The printing plate capable of eliminating tension differences according to claim 1, characterized in that: The groove width A1 of the squeegee groove (41) is between 0.008mm and 0.015mm; the groove width of the squeegee groove (41) is A1, and the groove width of the material receiving groove (42) is A2, where A2 = (10-20)A1.

3. The printing plate capable of eliminating tension differences according to claim 1 or 2, characterized in that: The steel plate groove (4) is arranged along the scraping direction of the scraper; the material-containing groove (42) is a flat-bottomed groove.

4. The printing plate capable of eliminating tension differences according to claim 1, characterized in that: The radius of the circle containing the outer edge of the arc-shaped tension balancing groove (5) is R2, and the radius of the circle containing the inner edge of the arc-shaped tension balancing groove (5) is R1, where R2 > R1.

5. The printing plate capable of eliminating tension differences according to claim 4, characterized in that: The centers of the circles containing the outer and inner arc groove edges of the arc-shaped tension balance groove (5) are both located on the symmetrical line of the adjacent steel plate groove (4).

6. The printing plate capable of eliminating tension differences according to claim 1, characterized in that: The orifice-shaped tension balancing groove (6) includes at least one row of through grooves, which are circular, rectangular or triangular through grooves.

7. The printing plate capable of eliminating tension differences according to claim 1, characterized in that: At least one plate of the tension balance zone (32) is covered with a tension balance coating (7), which covers the arc-shaped tension balance groove (5) and the hole-shaped tension balance groove (6).

8. The printing plate capable of eliminating tension differences according to claim 1, characterized in that: The arc-shaped tension balancing groove (5) and the hole-shaped tension balancing groove (6) are arranged along the scraping direction of the scraper, and the arc-shaped tension balancing groove (5) is located inside the hole-shaped tension balancing groove (6).

9. The printing plate capable of eliminating tension differences according to claim 1, characterized in that: The elastic filler structure is made of silicone rubber, thermoplastic elastomer, or hydrogel.

10. The printing plate capable of eliminating tension differences according to claim 1, characterized in that: The tension wire mesh (2) has an L2 of (1.5-2.5)L1; the printing plate (3) is a thin metal plate with a thickness h1 of 0.01mm-0.03mm.

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