Scraper blade for screen printing of photovoltaic cells

Abstract

The utility model relates to the field of printing scraping strip, especially photovoltaic cell screen printing is with scraping strip. Including the screen version has the hollow part and entity department along the preset direction, the entity department is located the edge of hollow part, and the scraping strip includes: the locating plate and the body, one end of the body is connected with the locating plate, the other end of the body is pasted with the screen version away from the locating plate, the body is connected with the screen version sliding, the scraping strip can move and scrape on the screen version, the sliding direction of scraping strip is perpendicular to the preset direction, the body includes first area, second area and transition area. The scraping strip for photovoltaic cell screen printing provided by the utility model has that the scraping strip assembly adopts the wave shape structure design, increases the flexibility, and provides more gentle transition. Ensure the continuity and suitable change trend of hardness. Effectively solved the problem of uneven printing effect, improved the adaptability of scraping strip in the printing process.

Description

Technical Field

[0001] This utility model relates to the field of printing squeegees, and more particularly to squeegees for photovoltaic cell screen printing. Background Technology

[0002] Currently, photovoltaic cell screen printing typically uses a squeegee. The squeegee's movement and squeezing action force the printing paste through the screen to form the desired pattern on the surface of the photovoltaic cell. However, in actual use, photovoltaic cell screen printing often suffers from printing defects such as thick lines and whitening, resulting in low printing quality of photovoltaic cells. It can also easily lead to screen breakage (screen cracking) and paste leakage, increasing production costs.

[0003] Existing technologies, such as Chinese patent CN114953717A, propose using a squeegee with a lower hardness in the first region than in the second region to address the issue of inconsistent deformation between patterned and non-patterned areas during printing. By adjusting the hardness distribution of the squeegee, problems such as screen printing ink leakage and poor printing can be mitigated, thereby improving the printing quality and conversion efficiency of photovoltaic cells.

[0004] However, the change in hardness between the first and second zones can cause printing quality problems, such as uneven printing, at the zone transition points. Therefore, it is necessary to make the hardness change smoother to improve the printing uniformity of the squeegee used in photovoltaic cell screen printing. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies.

[0006] To solve the above-mentioned technical problems, this utility model provides a squeegee for photovoltaic cell screen printing, comprising: a screen having a hollow portion and a solid portion along a preset direction, the solid portion being located at the edge of the hollow portion; a squeegee assembly comprising: a positioning plate and a body, one end of the body being connected to the positioning plate, the other end of the body away from the positioning plate being attached to the screen; the body being slidably connected to the screen; the squeegee being able to move and scrape on the screen; the sliding direction of the squeegee being perpendicular to the preset direction; the body comprising a first region, a second region, and a transition region; and the body being attached to and sliding on the screen. The first region is connected to the solid part during the movement, and the second region is connected to the hollow part during the sliding of the body against the screen. The transition region is located between the first region and the second region. During the sliding of the body against the screen, the transition region is connected to both the solid part and the hollow part. The transition region is located between the hollow part and the solid part. The first region is connected to the non-hollow part of the screen, and the second region is connected to the hollow part. Under the action of printing pressure, the deformation is basically the same. The transition region is used to improve the transition of deformation force between the hollow part and the non-hollow part under the action of printing pressure.

[0007] Preferably, the first region and the second region are alternately arranged along a preset direction. A plurality of transition regions are arranged along the preset direction, with the transition regions located between the first region and the second region, and the second region located between two transition regions.

[0008] Preferably, when viewed vertically, the body of the scraper assembly is designed with a wavy structure, which indicates a first region, a second region, and a transition region in the body. The contact areas of the three regions with the screen are different. The wavy structure creates a certain pressure difference during the scraping process, allowing the printing paste to better penetrate into the cutout parts of the screen.

[0009] Preferably, when viewed vertically, the width of the transition region gradually decreases from one end near the first region to one end near the second region, and the change in the width of the transition region when viewed vertically is the change in the bonding area between the transition region and the screen.

[0010] Preferably, when viewed vertically, the width of the second region of the scraper assembly gradually increases towards both ends of the two transition regions. The second region corresponds to the hollowed-out portion, and the change in the second region indicates the change in the contact area between the second region and the hollowed-out portion to the solid portion.

[0011] Preferably, when viewed vertically, the width of the first region gradually decreases towards both ends of the two transition regions. The first region corresponds to the solid portion of the screen printing plate, and the width change indicates the change in the contact area between the first region and the solid portion to the cutout portion.

[0012] Preferably, the wavy structure includes a concave portion and a convex portion, the concave portion being formed by the width variation of the second region and the two transition regions, and the convex portion being formed by the width variation of the first region.

[0013] Preferably, the hardness of the first region is denoted as A1, the hardness of the transition region is denoted as A2, and the hardness of the second region is denoted as A3, satisfying the following relationship:

[0014] A1 > A2 > A3.

[0015] Preferably, when viewed along the width direction, the thickness of the body of the scraper assembly gradually decreases from one end of the positioning plate to the end that slides and adheres to the screen.

[0016] Compared with related technologies, the squeegee for photovoltaic cell screen printing provided by this utility model has the following advantages:

[0017] Beneficial effects:

[0018] This utility model provides a squeegee for photovoltaic cell screen printing. Through a structural design, the squeegee assembly adopts a wave-shaped structure, increasing flexibility and providing a smoother transition. This ensures continuity and appropriate variation in hardness, effectively solving the problem of uneven printing results and improving the squeegee's adaptability during the printing process. Attached Figure Description

[0019] Figure 1 A schematic diagram of the squeegee used for screen printing of photovoltaic cells provided by this utility model;

[0020] Figure 2 for Figure 1 The diagram shown is a structural schematic of the screen printing plate.

[0021] Figure 3 for Figure 1 The left view of the squeegee assembly used for screen printing of photovoltaic cells shown;

[0022] Figure 4 for Figure 1 The top view of the main body shown;

[0023] Figure 5 for Figure 4 The image shown is a magnified view of a portion of AA.

[0024] The following labels are used in the diagram: 100, scraper assembly; 200, screen; 210, preset direction; 220, cutout part; 230, solid part; 10, positioning plate; 20, body; 21, first area; 22, second area; 23, transition area; 24, wave-shaped structure; 241, concave part; 242, convex part; 30, vertical direction; 40, width direction. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0026] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0027] Please see Figures 1 to 5The photovoltaic cell screen printing squeegee provided in this embodiment includes: a screen 200, which has a hollow portion 220 and a solid portion 230 along a preset direction 210, with the solid portion 230 located at the edge of the hollow portion 220. The squeegee assembly 100 includes: a positioning plate 10 and a body 20. One end of the body 20 is connected to the positioning plate 10, and the other end of the body 20 away from the positioning plate 10 is attached to the screen 200. The body 20 and the screen 200 are slidably connected, allowing for movable squeegee application on the screen 200. The body 20 includes a first region 21, a second region 22, and a transition region 23. During the sliding contact between the body 20 and the screen 200, the first region 21 is connected to the solid portion 230. During the sliding contact between the body 20 and the screen 200, the second region 22 is connected to the hollow portion 220; the transition region 23 is located between the first region 21 and the second region 22. During the sliding of the body 20 and the screen 200, the transition area 23 is connected to the solid part 230 and the hollow part 220 respectively, and the transition area 23 is located between the hollow part 220 and the solid part 230.

[0028] The squeegee used for printing on the photovoltaic cell screen 200, as described above, balances the hardness distribution of the squeegee through the introduction of a transition region 23. The squeegee assembly 100 adopts a wave-shaped structure 24 design, increasing flexibility and providing a smoother transition. This ensures the continuity of hardness and a suitable trend of change. It effectively solves the problem of uneven printing results and improves the adaptability of the squeegee during the printing process.

[0029] Please see Figures 1 to 5 The embodiments of this application provide a squeegee for screen printing of photovoltaic cells. The screen 200 has a hollow portion 220 and a solid portion 230 along a preset direction 210. The solid portion 230 is located at the edge of the hollow portion 220. The squeegee assembly 100 includes a positioning plate 10 and a body 20. One end of the body 20 is connected to the positioning plate 10, and the other end of the body 20 away from the positioning plate 10 is attached to the screen 200. The body 20 is slidably connected to the screen 200 and can move and squeegee on the screen 200. The body 20 includes a first region 21, a second region 22 and a transition region 23. When the body 20 is attached to and slides with the screen 200, the first region 21 is connected to the solid portion 230. When the body 20 is attached to and slides with the screen 200, the second region 22 is connected to the hollow portion 220. The transition region 23 is located between the first region 21 and the second region 22. During the sliding of the body 20 and the screen 200, the transition area 23 is connected to the solid part 230 and the hollow part 220 respectively, and the transition area 23 is located between the hollow part 220 and the solid part 230.

[0030] Specifically, since the screen 200 has a perforated portion 220 and a non-perforated portion 220 along the preset direction 210, that is, the first region 21 and the second region 22 are distributed along the preset direction 210, so that when the squeegee assembly 100 is applied to the screen 200 for printing, the first region 21 and the second region 22 will not interfere with each other as the squeegee assembly 100 moves. Taking advantage of the fact that the hardness of the first region 21 is less than that of the second region 22, in actual use, the perforated portion 220 and the non-perforated portion 220 of the screen 200 can deform at approximately the same rate under the action of printing pressure. However, the sudden change in hardness between the perforated portion 220 and the non-perforated portion 220 leads to uneven printing between the perforated portion 220 and the non-perforated portion 220. Therefore, a transition region 23 is introduced to avoid the problem of uneven printing between the perforated portion 220 and the non-perforated portion 220 caused by the sudden change in hardness between the first region 21 and the second region 22.

[0031] In practical use, the squeegee assembly 100 is generally installed on a printing press. The printing press controls the movement of the squeegee assembly 100 on the screen 200 through certain printing parameters and applies a certain printing pressure to the screen 200. Therefore, optionally, the squeegee assembly 100 has a body 20 and a positioning plate 10 with uniform hardness. The positioning plate 10 is connected to the body 20, and the contact surface between the body 20 and the screen 200 is located on the side of the body 20 away from the positioning plate 10. The positioning plate 10 is used to connect to the printing press. The setting of the positioning plate 10 with uniform hardness facilitates the application of printing pressure to the squeegee assembly 100, which helps to evenly distribute the force applied to all parts of the body 20 and avoid the reduction in printing quality caused by uneven distribution of printing pressure. At this time, in the process of manufacturing the squeegee assembly 100, it is not necessary to consider the positioning plate 10. It is only necessary to change the material of the body 20 or the molding temperature, etc., so that the hardness of the first region 21 and the second region 22 of the coating plane is within the target hardness range.

[0032] Optionally, the positioning plate 10 may be provided with positioning holes, etc., to facilitate its precise installation on the printing press, which is not limited here.

[0033] It is understandable that the hardness of the positioning plate 10 can be equal to the hardness of the first region 21. In order to facilitate the application of pressure and avoid deformation, and in order to facilitate stable installation on the printing press, the hardness of the positioning plate 10 is not less than the hardness of the first region 21. Optionally, the hardness of the positioning plate 10 is greater than the hardness of the first region 21.

[0034] Furthermore, the body 20 is the core part of the squeegee assembly 100, directly contacting the screen 200 to realize the coating operation. The first region 21 in the body 20 is connected to the solid part 230 of the screen 200, mainly undertaking the task of contacting the solid part 230 during the coating process and pushing the paste to move. Since the solid part 230 is a non-perforated area, the first region 21 needs to have sufficient hardness and wear resistance to ensure that it will not deform due to excessive force during the coating process. Through the tight connection between the first region 21 and the solid part 230, it can be ensured that the paste will not accumulate or leak in the non-perforated area during the coating process, thereby ensuring the printing quality and the clarity of the pattern.

[0035] Furthermore, the second region 22 in the body 20 is connected to the cutout portion 220 of the screen 200. Its main function is to ensure that the paste can pass smoothly through the cutout portion 220 and be evenly distributed on the photovoltaic cell. Since the cutout portion 220 is a key area for pattern formation, the second region 22 needs to have appropriate elasticity and hardness to adapt to the shape of the cutout portion 220 during the coating process. The hardness of the second region 22 is less than that of the first region 21. By optimizing the design of the second region 22, it can be ensured that the paste can be evenly and accurately filled into the cutout portion 220, thereby forming a clear and accurate printed pattern and improving the performance of the photovoltaic cell.

[0036] Furthermore, the transition region 23 is located between the first region 21 and the second region 22. It serves as a connection and transition. During the coating process, the transition region 23 needs to adapt to the transition from the solid part 230 to the hollow part 220, ensuring that the paste can smoothly transition from the first region 21 to the second region 22. The design of the transition region 23 can reduce the accumulation or leakage of paste during the transition process, improve the uniformity and consistency of printing. At the same time, it can also alleviate printing defects caused by the deformation differences of different areas of the screen 200, such as paste leakage and thick printing lines, thereby improving printing quality and the yield of photovoltaic cells.

[0037] During the sliding process of the squeegee assembly 100 against the screen 200, the first region 21 first contacts the solid portion 230 of the screen 200, pushing the ink forward. As the squeegee assembly 100 moves, the transition region 23 begins to function, adapting to the transition from the solid portion 230 to the cutout portion 220, ensuring a smooth ink transition. Finally, the second region 22 contacts the cutout portion 220, evenly filling the cutout portion 220 with ink to form the printed pattern.

[0038] In summary, this squeegee assembly 100 is primarily used in the manufacturing process of photovoltaic cells, especially in scenarios requiring high-precision, high-definition printed patterns. For example, in the manufacture of solar panels, conductive paste needs to be precisely applied to specific areas of the cell to form circuit patterns. Furthermore, the squeegee assembly 100 can also be applied to other fields requiring high-precision printing, such as the manufacturing industries of electronic components and displays.

[0039] In a specific implementation example, the first region 21 and the second region 22 are alternately set along a preset direction 210, and multiple transition regions 23 are set along the preset direction 210. The transition regions 23 are located between the first region 21 and the second region 22, and the second region 22 is located between the two transition regions 23.

[0040] Specifically, the first region 21 and the second region 22 are alternately arranged along a preset direction 210. This alternating arrangement ensures that the scraper assembly 100 can alternately contact the solid portion 230 and the cutout portion 220 of the screen 200 during the coating process. In this way, the scraper assembly 100 can more effectively control the flow of the paste between the solid portion 230 and the cutout portion 220, and achieve more precise coating.

[0041] Furthermore, the alternating arrangement allows the scraper assembly 100 to form a more uniform coating during application, preventing the accumulation or omission of paste in a certain area and improving the consistency and clarity of the printed pattern.

[0042] Furthermore, the multiple transition regions 23 are arranged along a preset direction 210, allowing the scraper assembly 100 to transition more smoothly from the solid portion 230 to the cut-out portion 220 during the coating process, reducing resistance and improving coating efficiency. Through the synergistic effect of the multiple transition regions 23, the accumulation and leakage of paste in the transition regions 23 can be more effectively alleviated, resulting in clearer and more accurate printed patterns.

[0043] Furthermore, the transition region 23 serves as a bridge connecting the first region 21 and the second region 22, smoothly transitioning the coating process from the solid portion 230 to the cutout portion 220. As the squeegee assembly 100 slides against the screen 200, the transition region 23 gradually changes the pressure and flow direction of the paste, ensuring that the paste flows evenly and continuously from the first region 21 to the second region 22. The design of the transition region 23 reduces problems such as paste accumulation, leakage, or poor printing caused by sudden changes, thus improving printing uniformity and consistency, and consequently increasing the yield and production efficiency of photovoltaic cells.

[0044] In summary, the second region 22 is surrounded by two transition regions 23. This arrangement allows the second region 22 to obtain more stable support and a more uniform pressure distribution during the coating process. This helps ensure that the paste can accurately fill the cutout portion 220 of the screen 200, forming a clear printed pattern. By placing the second region 22 between the two transition regions 23, the stability and reliability of the squeegee assembly 100 during the coating process can be enhanced. This helps reduce printing quality problems caused by structural instability and improves the performance and reliability of photovoltaic cells.

[0045] In a specific implementation example, viewed along the vertical direction 30 of the scraper assembly 100, the body 20 is set as a wave-shaped structure 24. The wave-shaped structure 24 represents the first region 21, the second region 22, and the transition region 23 in the body 20. These three regions have different contact areas with the screen 200. The wave-shaped structure 24 forms a certain pressure difference during the coating process, which allows the printing paste to better penetrate into the cutout portion 220 of the screen 200.

[0046] Specifically, the wave-shaped structure 24 causes the scraper assembly 100 to have an undulating shape in the vertical direction 30. This shape change results in different contact areas between the first region 21, the second region 22 and the transition region 23 and the screen 200. During the coating process, this differentiated contact area allows the interaction between the scraper assembly 100 and the screen 200 to be more flexible and varied.

[0047] Furthermore, since different areas have different contact areas with the screen 200, the design of the wave-shaped structure 24 will generate different pressure distributions during the coating process. This pressure distribution helps the scraper assembly 100 to better adapt to the changes on the surface of the screen 200, ensuring that the slurry can flow evenly and stably.

[0048] Furthermore, the wave-shaped structure 24 design allows the squeegee assembly 100 to better control the flow and distribution of the paste during the coating process. Through differentiated contact area and pressure distribution, the squeegee assembly 100 can ensure that the paste is evenly coated on the screen 200, avoiding the phenomenon of paste accumulation or leakage, thereby improving the uniformity of printing.

[0049] Furthermore, the wave-shaped structure 24 design also helps to improve print clarity. Because the squeegee assembly 100 can better adapt to the changes on the surface of the screen 200, the ink can be filled more accurately into the cutouts 220 of the screen 200, forming a clear and accurate printed pattern.

[0050] Because the wave-shaped structure 24 design optimizes the coating process, it reduces the scrap rate caused by poor printing, thereby improving production efficiency. In addition, the uniform and stable coating process also helps to reduce equipment failure and maintenance costs, further improving overall production efficiency.

[0051] In a specific implementation example, when viewed along the vertical direction 30 of the scraper assembly 100, the width of the transition region 23 gradually decreases from the end near the first region 21 to the end near the second region 22. The change in the width of the transition region 23 observed in the vertical direction 30 is the change in the bonding area between the transition region 23 and the screen 200.

[0052] Specifically, the change in width of the transition area 23 causes its contact area with the screen 200 to gradually decrease in the vertical direction 30. This design allows the scraper assembly 100 to gradually change the pressure on the screen 200 and the flow direction of the slurry during the coating process, achieving a smoother transition.

[0053] Furthermore, by changing the width of the transition area 23, the scraper assembly 100 can form a more reasonable pressure distribution during the coating process. The transition area 23 near the first area 21 is wider, which can provide a larger support area and stable pressure, ensuring that the slurry can smoothly transition to the second area 22; while the transition area 23 near the second area 22 is narrower, which can reduce the obstruction to the flow of the slurry, allowing the slurry to fill the cutout portion 220 of the screen 200 more smoothly.

[0054] Furthermore, the gradually decreasing width of the transition area 23 helps reduce paste accumulation and leakage during the coating process, improving the uniformity and clarity of the printing. This design ensures that the paste can more accurately fill the cutout portion 220 of the screen 200 during the coating process, forming a clear and accurate printed pattern.

[0055] Furthermore, by optimizing the width variation of the transition area 23, the squeegee assembly 100 can more stably adhere to the surface of the screen 200 during the coating process, reducing coating defects caused by structural instability. This design improves the stability and reliability of the squeegee assembly 100 and extends its service life.

[0056] In summary, the gradually decreasing width of the transition region 23 reduces defects during the coating process, thereby improving the yield and production efficiency of photovoltaic cells. At the same time, the stable coating process also helps reduce equipment failures and maintenance costs, further enhancing overall production efficiency.

[0057] In a specific implementation example, when viewed along the vertical direction 30 of the scraper assembly 100, the width of the second region 22 gradually increases towards both ends of the two transition regions 23. The second region 22 corresponds to the hollowed-out portion 220, and the change in the second region 22 indicates the change in the contact area between the second region 22 and the hollowed-out portion 220 to the solid portion 230.

[0058] Specifically, the width of the second region 22 gradually increases towards both ends of the transition region 23, which means that in the vertical direction 30, the contact area between the second region 22 and the screen 200 is large at both ends and small in the middle. This design helps to form a more reasonable pressure distribution during the coating process, so that the slurry can be better distributed evenly on the screen 200.

[0059] Furthermore, since the second region 22 is the main area responsible for filling the slurry into the cutout portion 220 of the screen 200, its gradually increasing width design allows the scraper assembly 100 to exert a greater pushing force on the slurry during the coating process, thereby ensuring that the slurry can be more fully filled into the cutout portion 220, reducing the situation of slurry leakage or insufficient filling.

[0060] Furthermore, the varying width of the second region 22 also creates a smooth connection with the transition region 23, ensuring that the scraper assembly 100 can smoothly transition from the first region 21 to the second region 22 and then smoothly transition to the next first region 21 during the coating process, thereby reducing coating defects caused by structural abrupt changes.

[0061] In a specific implementation example, when viewed along the vertical direction 30 of the scraper assembly 100, the width of the first region 21 gradually decreases towards both ends of the two transition regions 23. The first region 21 corresponds to the solid portion 230 of the screen 200. The change in width indicates the change in the contact area between the first region 21 and the solid portion 230 to the cutout portion 220.

[0062] Specifically, the first region 21 corresponds to the solid portion 230 of the screen 200, which means that during the coating process, the first region 21 is mainly responsible for contacting the solid portion 230 of the screen 200. Since the solid portion 230 is usually relatively hard and flat, the gradually decreasing width of the first region 21 allows it to better adapt to changes in the surface of the screen 200, ensuring that the scraper assembly 100 can stably adhere to the screen 200 during the coating process.

[0063] Furthermore, the gradual reduction in the width of the first region 21 helps to create a more reasonable pressure distribution during the coating process. Near the transition region 23, the width of the first region 21 decreases, which means that the pressure of the scraper assembly 100 on the screen 200 gradually increases, thereby better pushing the slurry into the transition region 23 and the subsequent second region 22. This optimization of pressure distribution helps to improve the uniformity and accuracy of coating.

[0064] Furthermore, the gradually decreasing width of the first region 21 also creates a smooth transition with the transition region 23. During the coating process, the scraper assembly 100 can smoothly transition from the first region 21 to the transition region 23, and then further to the second region 22, thereby reducing coating defects caused by structural abrupt changes.

[0065] In a specific implementation example, the wave-shaped structure 24 includes a concave portion 241 and a convex portion 242. The concave portion 241 is formed by the width variation of the second region 22 and the two transition regions 23, and the convex portion 242 is formed by the width variation of the first region 21.

[0066] Specifically, the recess 241 is formed by the width variation of the second region 22 and the two transition regions 23. This design allows the squeegee assembly 100 to form an effective pressure gradient during the coating process. As the squeegee assembly 100 moves from the transition region 23 to the second region 22, the gradual increase in width leads to a gradual decrease in pressure, which helps the slurry to be evenly filled into the cutout portion 220 of the screen 200. The presence of the recess 241 also increases the contact area between the squeegee assembly 100 and the surface of the screen 200, improving the stability and efficiency of coating.

[0067] Furthermore, the protrusion 242 is formed by the width variation of the first region 21. The first region 21 corresponds to the solid portion 230 of the screen 200, and its gradually decreasing width helps the squeegee assembly 100 to better adapt to the changes on the surface of the screen 200 during the coating process. The presence of the protrusion 242 allows the squeegee assembly 100 to form a local high-pressure zone when it contacts the solid portion 230 of the screen 200, thereby more effectively pushing the paste into the recess 241. This design reduces the accumulation and leakage of paste during the coating process and improves the uniformity and clarity of the printing.

[0068] Furthermore, the concave portion 241 and convex portion 242 of the wave-shaped structure 24 work together to optimize the performance of the squeegee assembly 100 during the coating process. The concave portion 241 ensures that the paste can be evenly filled into the cutout portion 220 of the screen 200, while the convex portion 242 improves the stability and efficiency of coating. This design not only improves the printing quality of photovoltaic cells, but also extends the service life of the squeegee assembly 100 and reduces production costs.

[0069] In addition, the design of the wave-shaped structure 24 is flexible and can be adjusted according to different screen 200 structures and printing needs. By optimizing the shape, size and distribution of the concave part 241 and the convex part 242, the performance and adaptability of the squeegee assembly 100 can be further improved to meet the needs of different application scenarios.

[0070] In a specific implementation example, the hardness of the first region 21 is denoted as A1, the hardness of the transition region 23 is denoted as A2, and the hardness of the second region 22 is denoted as A3, satisfying the following relationship:

[0071] A1 > A2 > A3.

[0072] Specifically, the high hardness of the first region 21 ensures that the squeegee assembly 100 has sufficient rigidity and stability when it contacts the solid part 230 of the screen 200, which can resist the pressure and friction generated by coating and keep the shape of the squeegee assembly 100 stable and undeformed. The high hardness of the first region 21 can more accurately control the flow of the slurry, reduce the accumulation of slurry in the solid part 230 of the screen 200, and ensure that the slurry can smoothly enter the transition region 23 and the second region 22.

[0073] Furthermore, the hardness of the transition region 23 is between that of the first region 21 and the second region 22, thus providing a smooth transition. This design allows the squeegee assembly 100 to gradually change pressure and contact area when transitioning from the first region 21 to the second region 22, reducing abrupt changes and vibrations during the coating process. The moderately hard transition region 23 can better adapt to minor changes on the surface of the screen 200, ensuring that the squeegee assembly 100 maintains a stable fit during the coating process, thereby improving the uniformity and consistency of the coating.

[0074] Furthermore, the second region 22 is the main area responsible for filling the slurry into the cutout portion 220 of the screen 200. Its low hardness design gives the scraper assembly 100 better elasticity and deformation ability when it contacts the cutout portion 220, which can better adapt to the shape and size of the cutout portion 220 and achieve uniform filling of the slurry. The low hardness of the second region 22 reduces the frictional resistance between the scraper assembly 100 and the cutout portion 220 of the screen 200, making the coating process smoother and improving production efficiency.

[0075] Optionally, the hardness of the first region 21 is 40A to 65A. A hardness within this range is reasonable and can improve the service life of the screen printing plate 200 and the yield of the printed photovoltaic cells.

[0076] For example, the hardness of the first region 21 is any value of 40A, 43A, 45A, 47A, 50A, 53A, 55A, 57A, 60A, 63A, or 65A, or between any two values.

[0077] In one possible implementation, the hardness of the second region 22 is 50A to 80A. A hardness within this range is reasonable for the second region 22, which can improve the lifespan of the screen 200 and the yield of the printed photovoltaic cells.

[0078] For example, the hardness of the second region 22 is any value of 50A, 53A, 55A, 57A, 60A, 63A, 65A, 67A, 70A, 73A, 75A, 78A, or 80A, or between any two values.

[0079] In one possible implementation, the hardness of the transition region 23 is 55A to 70A. A reasonable hardness within this range can improve the lifespan of the screen 200 and the yield of the printed photovoltaic cells.

[0080] For example, the hardness of the second region 22 is any value of 55A, 57A, 60A, 63A, 65A, 67A, 70A or between any two values.

[0081] In a specific implementation example, when viewed along the width direction 40 of the scraper assembly 100, the thickness of the body 20 gradually decreases from one end of the positioning plate 10 to the end that slides and adheres to the screen 200.

[0082] Specifically, the gradually decreasing thickness of the body 20 allows the scraper assembly 100 to form a reasonable pressure distribution during its sliding contact with the screen 200. At the end closer to the positioning plate 10, the thicker body 20 provides greater support and stability; while at the end sliding in contact with the screen 200, the thinner body 20 reduces frictional resistance, resulting in a smoother coating process.

[0083] Furthermore, the gradual reduction in thickness also increases the flexibility of the scraper assembly 100 at the end that slides in contact with the screen 200. This design allows the scraper assembly 100 to better adapt to minor changes on the surface of the screen 200, such as unevenness or fine texture, thereby ensuring that the paste can be filled evenly and accurately into the cutout portion 220 of the screen 200.

[0084] Furthermore, by gradually reducing the thickness of the body 20, the amount of material used in the scraper assembly 100 can be reduced while meeting performance requirements, thereby reducing costs. This design maintains the functionality of the scraper assembly 100 while also embodying the concepts of environmental protection and energy conservation.

[0085] In a specific implementation example, the first region 21, the transition region 23, and the second region 22 are all polyurethane structures.

[0086] In the above process, polyurethane is used to achieve different hardnesses in the first region 21, the transition region 23, and the second region 22 based on different blending methods or molding temperatures. Polyurethane has good stability, chemical resistance, resilience, and mechanical properties, and is also easy to obtain.

[0087] Specifically, polyurethane is very suitable as the structural material for the first region 21, the transition region 23 and the second region 22. Polyurethane is a polymer material with excellent performance. Its hardness can be adjusted by different blending methods and molding temperatures to meet the different performance requirements of each region of the scraper assembly 100.

[0088] In the first region 21, since a high hardness is required to maintain the stability of the scraper assembly 100 and to precisely control the flow of the slurry, the polyurethane formulation and molding process can be adjusted to give it a high hardness value. In this way, the first region 21 can effectively resist the pressure and friction generated during the coating process, ensuring that the scraper assembly 100 maintains a stable shape when it is in contact with the solid part 230 of the screen 200.

[0089] In transition region 23, in order to achieve a smooth transition from the first region 21 to the second region 22, the polyurethane material needs to have a certain elasticity and deformation capacity. By appropriately reducing the hardness of the polyurethane and optimizing its internal structure, the pressure and contact area of ​​transition region 23 can be gradually changed during the coating process, reducing abrupt changes and vibrations, thereby improving the uniformity and consistency of coating.

[0090] In the second region 22, since it is mainly responsible for filling the slurry into the cutout portion 220 of the screen 200, the polyurethane material needs to have low hardness and good resilience. This ensures that the scraper assembly 100 can fit tightly when it contacts the cutout portion 220, achieving uniform filling of the slurry. At the same time, the lower hardness can also reduce the frictional resistance between the scraper assembly 100 and the screen 200, making the coating process smoother.

[0091] Furthermore, in addition to adjustable hardness, polyurethane also has good stability, chemical resistance, resilience and mechanical properties. This enables the polyurethane wiper assembly 100 to maintain stable performance during long-term use, resist chemical corrosion and mechanical wear. At the same time, polyurethane material is relatively easy to obtain and has a low cost, making it suitable for large-scale production and application.

[0092] Therefore, the squeegee assembly 100 for printing on the photovoltaic cell screen 200 provides a transition region 23 to balance the hardness distribution of the squeegee assembly 100. The body 20 adopts a wave-shaped structure 24 design, which increases flexibility and provides a smoother transition. This ensures the continuity of hardness and a suitable trend of change, effectively solving the problem of uneven printing effect and improving the adaptability of the squeegee assembly 100 in the printing process.

[0093] The circuits and controls involved in this utility model are all existing technologies, and will not be described in detail here.

[0094] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A squeegee for screen printing of photovoltaic cells, characterized in that, include: A screen printing plate (200) has a cutout portion (220) and a solid portion (230) along a preset direction (210), the solid portion (230) being located at the edge of the cutout portion (220), and a scraper assembly (100) including: Positioning plate (10) and A body (20), one end of which is connected to a positioning plate (10), and the other end of which is slidably connected to a screen (200) for coating, the body (20) comprising: In the first region (21), the body (20) slides and adheres to the screen (200), and is connected to the solid part (230); In the second region (22), the body (20) slides and adheres to the screen (200), and is connected to the hollow part (220); The transition region (23) is located between the first region (21) and the second region (22). During the sliding of the screen (200), the transition region (23) is connected to the solid part (230) and the hollow part (220) respectively. The transition region (23) is located between the hollow part (220) and the solid part (230).

2. The squeegee for photovoltaic cell screen printing according to claim 1, characterized in that, The first region (21) and the second region (22) are alternately arranged along a preset direction (210); Multiple transition regions (23) are arranged along a preset direction (210). The transition region (23) is located between the first region (21) and the second region (22), and the second region (22) is located between the two transition regions (23).

3. The squeegee for photovoltaic cell screen printing according to claim 1, characterized in that, When viewed vertically (30), the scraper assembly (100) has a wavy structure (24) on its main body (20).

4. The squeegee for photovoltaic cell screen printing according to claim 1, characterized in that, When viewed vertically (30) of the scraper assembly (100), the width of the transition region (23) gradually decreases from one end near the first region (21) to the other end near the second region (22).

5. The squeegee for photovoltaic cell screen printing according to claim 1, characterized in that, When viewed vertically (30) of the scraper assembly (100), the width of the second region (22) gradually increases toward the two ends of the two transition regions (23).

6. The squeegee for photovoltaic cell screen printing according to claim 1, characterized in that, When viewed vertically (30), the width of the first region (21) of the scraper assembly (100) gradually decreases toward the two ends of the transition regions (23).

7. The squeegee for photovoltaic cell screen printing according to claim 3, characterized in that, The wave-shaped structure (24) includes: The recess (241) is formed by the width variation of the second region (22) and the two transition regions (23); The protrusion (242) is formed by the width variation of the first region (21).

8. The squeegee for photovoltaic cell screen printing according to claim 1, characterized in that, The hardness of the first region (21) is denoted as A1, the hardness of the transition region (23) is denoted as A2, and the hardness of the second region (22) is denoted as A3, satisfying the following relationship: A1 > A2 > A3.

9. The squeegee for photovoltaic cell screen printing according to claim 1, characterized in that, When viewed along the width direction (40) of the scraper assembly (100), the thickness of the body (20) gradually decreases from one end of the positioning plate (10) to the end that slides against the screen (200).

10. The squeegee for photovoltaic cell screen printing according to claim 1, characterized in that, The first region (21), the transition region (23), and the second region (22) are all polyurethane structures.

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