Full-opening metal screen plate

Abstract

The utility model relates to the technical field of screen printing, in particular to a full-opening metal screen which comprises a first screen body and a second screen body which are attached to each other, the first screen body is provided with a plurality of first grid line holes, the second screen body is provided with second grid line holes, and the first grid line holes and the second grid line holes are correspondingly arranged. The first grid line holes are not smaller than the second grid line holes, and the end face, away from the second screen printing plate, of the first screen printing plate is provided with nanoimprint patterns. According to the utility model, the stability between the scraper and the first screen printing plate in the printing process is ensured through the nanoimprint pattern on the surface of the first screen printing plate, and the risks of grid line virtual printing and grid breaking in the printing process are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of screen printing, especially relates to a full-opening metal screen. BACKGROUND

[0002] The metal screen is widely applied in the grid line printing process of photovoltaic power generation cell piece, and the production efficiency can be improved by printing the grid line by using the metal screen, and the production process is more stable. At present, the metal screen mainly scrapes the paste into the grid line hole along the surface of the screen by the scraper to form the grid line of the cell piece. In the printing process of the scraper, the screen is of metal material, and slipping is prone to occur between the screen and the scraper, resulting in the virtual printing or broken grid of the grid line.

[0003] For example, a metal screen for improving printing performance disclosed in Chinese patent with publication number CN216300471U improves the printing performance of the metal screen, which comprises a metal screen body, a printing channel extending along the printing direction of the metal screen body is formed on the metal screen body, a plurality of transition yarns arranged along the extension track of the printing channel are arranged in the printing channel, the two ends of the transition yarns are connected to the printing channel, the transition yarns are arc-shaped transition yarns protruding away from the printing direction, the printing channel is linear, the middle part of the transition yarns protrudes away from the printing direction, and the distance between the adjacent two transition yarns is equal. The above-mentioned utility model improves the ink permeability of the paste by arranging the printing channel on the surface of the screen, but the problem of easy slipping between the screen and the scraper leading to the virtual printing of the grid line still exists. SUMMARY

[0004] In view of the problems in the prior art, the utility model provides a full-opening metal screen which is not prone to slipping between the scraper and the screen, improves the stability of the paste entering the grid line hole, and is not prone to virtual printing and broken grid in the printing process.

[0005] To achieve the above technical effects, the utility model provides:

[0006] A full-opening metal screen, which comprises a first screen and a second screen arranged in close contact with each other, a plurality of first grid line holes are formed in the first screen, second grid line holes are formed in the second screen, the first grid line holes and the second grid line holes are arranged correspondingly, the first grid line holes are not smaller than the second grid line holes, and a nano imprinting pattern is arranged on the end face of the first screen away from the second screen.

[0007] The aperture of the first grid line hole is not smaller than the aperture of the second grid line hole, usually, the aperture of the first grid line hole is larger than the aperture of the second grid line hole, the scraper contacts the first screen, the paste is scraped into the first grid line hole, further enters the second grid line hole, and the second grid line hole forms the grid line of the paste; the nano imprinting pattern increases the friction between the scraper and the first screen, so that the scraper is not prone to slipping with the first screen.

[0008] The nano-imprinting pattern is convex or concave, the nano-imprinting pattern size ranges from φ=1 μm to 50 μm, and the height or depth of the nano-imprinting pattern ranges from 0 μm to 5 μm.

[0009] The end face of the first screen plate away from the second screen plate is provided with a plurality of slurry storage grooves. The slurry storage grooves are regularly arranged and have the function of storing a certain amount of slurry, so as to avoid the decrease of slurry fluidity caused by the frictional heat between the first screen plate and the scraper.

[0010] The second grid line hole is provided with a plurality of slurry flow guide lines, the slurry flow guide lines are located on the end face of the second screen plate close to the first screen plate, and the slurry flow guide lines are communicated with the second grid line hole. The slurry flow guide lines can guide the slurry into the first grid line hole, thereby reducing the risk of grid breakage caused by insufficient printing of the slurry.

[0011] The slurry flow guide line has an inclination angle, the inclination direction of the slurry flow guide line is opposite to the printing direction of the scraper, and the inclination angle ranges from 10° to 80°. The slurry flow guide line has a certain inclination angle, and the inclination angle is opposite to the printing direction of the scraper. The slurry is extruded along the side edge of the slurry flow guide line under the action of the scraper.

[0012] The slurry flow guide line is provided with the nano-imprinting pattern.

[0013] The first grid line hole and the second grid line hole are in one or a combination of shapes of rectangle, circle, diamond and oval, and the shapes of the first grid line hole and the second grid line hole are correspondingly arranged.

[0014] The end face of the second screen plate away from the first screen plate is provided with a multi-layer metal plate structure, the multi-layer metal plate structure includes at least one metal plate, the metal plate is fixedly connected with the second screen plate through the back glue, and the multi-layer metal plate structure is provided with a metal plate grid line hole corresponding to the second grid line hole. The multi-layer metal plate structure is used for strengthening the rigidity of the whole metal screen plate.

[0015] The outermost metal plate of the multi-layer metal plate structure away from the second screen plate is provided with a plastic film, and the plastic film is provided with a plastic film grid line hole corresponding to the metal plate grid line hole.

[0016] The beneficial effects of the full-opening metal screen plate are as follows:

[0017] The full-opening metal screen plate provided by the utility model has the advantages that the slurry storage grooves and the nano-imprinting pattern are arranged on the surface of the screen plate, the stability in the process of scraper printing is ensured, and the decrease of slurry fluidity caused by the frictional heat between the scraper and the screen plate is avoided; the slurry flow guide lines stably guide the slurry into the grid line hole, and the risk of grid breakage is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a schematic diagram of the overall structure of a full opening metal screen.

[0019] Figure 2 is a schematic diagram of the cross-sectional structure of a full opening metal screen.

[0020] Figure 3 is a schematic diagram of the cross-sectional structure of a full opening metal screen. Figure 1 is a partial enlarged view of A in the middle.

[0021] Figure 4 is a schematic diagram of the structure of the slurry flow guide in Example One.

[0022] Figure 5 is a schematic diagram of the structure of the slurry flow guide in Example Two.

[0023] Reference numerals:

[0024] 1. First screen; 2. Second screen; 3. Nanoimprint pattern; 4. Multilayer metal plate structure; 5. Plastic film;

[0025] 11. First grid line hole; 12. Slurry storage groove; 21. Second grid line hole; 22. Slurry flow guide; 41. Metal plate; 42. Back adhesive; 43. Metal plate grid line hole; 51. Plastic film grid line hole. DETAILED DESCRIPTION

[0026] The metal screen printing grid line is an important process in the manufacture of solar photovoltaic cells. The existing metal screen printing has the problem that the scraper and the surface of the screen are easy to slip, resulting in grid line ghosting and broken grid. The present application proposes a full opening metal screen which is not easy to slip between the scraper and the screen, ensures the printing stability, and has the effect of guiding the slurry into the grid line hole. The following specific embodiments illustrate the implementation of the present application, and those skilled in the art can easily understand other advantages and effects of the present application from the disclosed content.

[0027] Example One

[0028] As Figure 1 and Figure 2As shown, the full opening metal screen plate includes a first screen plate 1 and a second screen plate 2 arranged in close contact with each other, the first screen plate 1 is provided with a plurality of first grid line holes 11, the second screen plate 2 is provided with second grid line holes 21, the first grid line holes 11 and the second grid line holes 21 are arranged correspondingly, and the first grid line holes 11 are not smaller than the second grid line holes 21, and the end face of the first screen plate 1 away from the second screen plate 2 is provided with a nano-imprint pattern 3. The first screen plate 1 and the second screen plate 2 are arranged in close contact with each other, the first screen plate 1 is provided with the first grid line holes 11, the second screen plate is provided with the second grid line holes 21, the first grid line holes 11 are rectangular, the length direction is along the squeegee printing direction, and the second grid line holes 21 are rectangular; the length and the width are smaller than those of the first grid line holes 11, the second grid line holes 21 are approximately strip-shaped, after the close arrangement of the first screen plate 1 and the second screen plate 2 is completed, the second grid line holes 21 are located at the center position of the first grid line holes 11; the end face of the first screen plate 1 away from the second screen plate 2 is provided with the nano-imprint pattern 3.

[0029] As shown in Figure 3 , the nano-imprint pattern 3 is convex or concave, the size range of the nano-imprint pattern 3 is φ = 1 μm - 50 μm, and the height or depth range of the nano-imprint pattern 3 is 0 μm - 5 μm. The nano-imprint pattern 3 is a convex or concave structure arranged on the surface of the screen plate, the arrangement is irregular, the size range of the nano-imprint pattern 3 is φ = 1 μm - 50 μm, and the height or depth range is 0 μm - 5 μm, the nano-imprint pattern 3 is used to increase the friction between the squeegee and the surface of the first screen plate 1, avoid slipping during printing, and cause grid line virtual printing or grid line break; the setting density of the nano-imprint pattern 3 is set according to the specific friction coefficient required between the squeegee and the first screen plate 1.

[0030] As shown in Figure 1 , the end face of the first screen plate 1 away from the second screen plate 2 is provided with a plurality of slurry storage grooves 12. The shape of the slurry storage groove 12 in the embodiment is diamond-shaped and regularly arranged, the slurry storage groove 12 is used to store a certain amount of slurry during printing, and cooperates with the nano-imprint pattern 3 to increase the friction between the squeegee and the first screen plate 1; the shape of the slurry storage groove 12 can also be set to other shapes and regularly arranged.

[0031] As shown in Figure 4As shown, the second grid line hole 21 is surrounded by a plurality of paste guide lines 22, the paste guide lines 22 are located on the end face of the second screen 2 close to the first screen 1, and the paste guide lines 22 are communicated with the second grid line hole 21. The paste guide lines 22 have an inclination angle, the inclination direction of the paste guide lines 22 is opposite to the printing direction of the doctor blade, and the inclination angle ranges from 10° to 80°. In the embodiment, the aperture of the first grid line hole 11 is larger than the aperture of the second grid line hole 21. After the first screen 1 and the second screen 2 are attached, a paste storage line groove is formed between the first grid line hole 11 and the second screen 2. On the bottom surface of the paste storage line groove, a plurality of paste guide lines 22 are arranged around the second grid line hole 21, and the paste guide lines 22 are communicated with the second grid line hole 21. The paste guide lines 22 have an inclination angle, the inclination direction of the paste guide lines 22 is opposite to the printing direction of the doctor blade, and the inclination angle of the paste guide lines 22 in the embodiment is 45°. The paste guide lines 22 are used to guide the paste hanging in the first grid line hole 11 into the first grid line hole 11 during printing, supplement the paste entering the first grid line hole 11, and avoid grid breakage. The inclination angle of the paste guide lines 22 makes the paste guiding more easily.

[0032] As shown in the figure, Figure 2 As shown, the end face of the second screen 2 away from the first screen 1 is provided with a multi-layer metal plate structure 4, the multi-layer metal plate 41 includes at least one metal plate 41, the metal plate 41 is fixedly connected with the second screen 2 through the back adhesive 42, and the multi-layer metal plate structure 4 is provided with the metal plate grid line hole 43 corresponding to the second grid line hole 21. The outermost metal plate 41 of the multi-layer metal plate structure 4 away from the second screen 2 is provided with a plastic film 5, and the plastic film 5 is provided with a plastic film grid line hole 51 corresponding to the metal plate grid line hole 43. In order to strengthen the overall strength of the metal screen, the multi-layer metal plate structure 4 in the embodiment is provided with three metal plates 41, the metal plates 41 are fixedly connected with the second screen 2 through the back adhesive 42, and the metal plates 41 form the multi-layer metal plate structure 4 through die casting. Meanwhile, the metal plate grid line hole 43 corresponding to the second grid line hole 21 on the second screen 2 is formed on each metal plate 41, and the shape and position of the metal plate grid line hole 43 are the same as those of the second grid line hole 21. The outermost layer of the multi-layer metal structure away from the second screen 2 is provided with a plastic film 5, and the plastic film 5 is provided with a plastic film grid line hole 51 corresponding to the metal plate grid line hole 43, and the shape and position of the plastic film grid line hole 51 are the same as those of the metal plate grid line hole 43. The plastic film 5 is used to ensure the attachment between the metal screen and the photovoltaic cell, and to avoid the metal screen from hanging on the photovoltaic cell.

[0033] In actual application of the full opening metal screen plate of the embodiment, the squeegee contacts the first screen plate 1, and the squeegee sequentially hangs the paste into the first grid line hole 11 along the surface of the first screen plate 1. In this process, due to the cooperation of the nano-imprint pattern 3 and the paste storage tank 12, the friction coefficient between the squeegee and the first screen plate 1 is large, and it is not easy to slip. The heat generated by the squeegee scraping the surface of the first screen plate 1 is large, and the paste storage tank 12 stores a certain amount of paste to avoid overheating of the paste. After the paste enters the first grid line hole 11, part of the paste directly enters the second grid line hole 21, and part of the paste enters the second grid line hole 21 through the flow guide line on the second screen plate 2 to supplement the paste entering the second grid line hole 21. The paste entering the second grid line hole 21 passes through the metal plate grid line hole 43 and the plastic film grid line hole 51, and finally reaches the surface of the photovoltaic cell, while forming a grid line shape.

[0034] In the embodiment, the nano-imprint pattern 3 on the surface of the first screen plate improves the friction between the squeegee and the first screen plate 1, and reduces the risk of slipping of the squeegee during printing. The paste storage tank 12 simultaneously avoids the heat generated by the friction between the squeegee and the screen plate, which reduces the flowability of the paste. The paste flow guide line 22 reduces the risk of grid line breakage, and has certain practical significance.

[0035] Embodiment two

[0036] In view of the problem that the squeegee is prone to slipping with the screen plate during the working process in the prior art, causing grid line ghosting or grid line breakage, the embodiment proposes a full opening metal screen plate which is not prone to slipping between the squeegee and the screen plate, ensures the printing stability, and has the effect of guiding the paste into the grid line hole.

[0037] As shown in Figure 1 and Figure 2 , the first screen plate 1 and the second screen plate 2 are arranged in close contact with each other, the first screen plate 1 is provided with the first grid line hole 11, and the second screen plate is provided with the second grid line hole 21. The first grid line hole 11 is rectangular, and the length direction is along the printing direction of the squeegee. The second grid line hole 21 is rectangular, and the length and width are smaller than those of the first grid line hole 11. The second grid line hole 21 is approximately strip-shaped. After the close arrangement of the first screen plate 1 and the second screen plate 2 is completed, the second grid line hole 21 is located at the center position of the first grid line hole 11. The nano-imprint pattern 3 is arranged on the end surface of the first screen plate 1 away from the second screen plate 2.

[0038] As shown in Figure 3 , the nano-imprint pattern 3 is a protrusion or a depression arranged on the surface of the screen plate, and the arrangement is irregular. The size of the nano-imprint pattern 3 is in the range of φ = 1 μm - 50 μm, and the height or depth is in the range of 0 μm - 5 μm. The nano-imprint pattern 3 is used to increase the friction between the squeegee and the surface of the first screen plate 1, and to avoid slipping during printing, which causes grid line ghosting or grid line breakage. The arrangement density of the nano-imprint pattern 3 is set according to the specific friction coefficient required between the squeegee and the first screen plate 1.

[0039] As Figure 1 shown, the slurry storage tank 12 in the embodiment is diamond-shaped, regularly arranged, and used to store a certain amount of slurry during printing, and cooperate with the nano-imprint pattern 3 to increase the friction between the squeegee and the first screen 1; the shape of the slurry storage tank 12 can also be set to other shapes and regularly arranged.

[0040] As Figure 5 shown, the first grid line hole 11 in the embodiment has a larger aperture than the second grid line hole 21, and after the first screen 1 and the second screen 2 are combined, a slurry storage line groove is formed between the first grid line hole 11 and the second screen 2, and a plurality of slurry flow guide lines 22 are arranged around the second grid line hole 21 on the bottom surface of the slurry storage line groove, and the slurry flow guide lines 22 are all connected to the second grid line hole 21; the slurry flow guide lines 22 have an inclination angle, and the inclination direction is opposite to the printing direction of the squeegee, and the angle of the slurry flow guide lines in the embodiment is 51°; the slurry flow guide lines 22 are used to guide the slurry into the first grid line hole 11 during printing, supplement the slurry entering the first grid line hole 11, and avoid grid breakage, and the inclination angle of the slurry flow guide lines 22 makes the slurry flow more easily.

[0041] As Figure 5 shown, the slurry flow guide lines 22 are provided with the nano-imprint pattern 3. In the embodiment, the nano-imprint pattern 3 is arranged on the bottom surface of the slurry flow guide lines, and the arrangement of the nano-imprint pattern 3 can increase the friction between the slurry and the slurry flow guide lines 22, so that there is still a certain amount of slurry in the slurry flow guide lines 22 after each printing, and the risk of grid breakage caused by insufficient printing is reduced.

[0042] As Figure 2 shown, in order to strengthen the overall strength of the metal screen, the multi-layer metal plate structure 4 in the embodiment is provided with three metal plates 41, the metal plates 41 and the second screen 2 are fixedly connected through the back glue 42, and the metal plates 41 are fixedly connected through the back glue 42; meanwhile, the metal plate grid line holes 43 corresponding to the second grid line holes 21 on the second screen 2 are arranged on each metal plate 41, and the shape and position of the metal plate grid line holes 43 are the same as those of the second grid line holes 21; the outermost layer of the multi-layer metal structure away from the second screen 2 is provided with a plastic film 5, and the plastic film grid line holes 51 corresponding to the metal plate grid line holes 43 are arranged on the plastic film 5, and the shape and position of the plastic film grid line holes 51 are the same as those of the metal plate grid line holes 43; the plastic film 5 is used to ensure the combination degree between the metal screen and the photovoltaic cell, and avoid the metal screen from hanging on the photovoltaic cell.

[0043] In the embodiment, the slurry guide line 22 is set to an inclination angle of 51°; a nano-imprint pattern 3 is arranged on the bottom surface of the slurry guide line 22, and a certain amount of slurry can be retained in the slurry guide line 22 after each printing is completed.

[0044] The full-opening metal screen plate has the advantages that the slurry storage groove and the nano-imprint pattern are arranged on the surface of the screen plate, stability in the squeegee printing process is ensured, and the friction between the squeegee and the screen plate is avoided to prevent heat generation and reduction of slurry fluidity; the slurry guide line stably guides the slurry into the grid line hole, and the risk of grid breakage is reduced, and the full-opening metal screen plate has practical significance.

[0045] The above content is the preferred embodiment of the utility model, which is used for describing the specific structure and function of the utility model, and it should be pointed out that the ordinary skilled in the art can make predictable improvements and modifications to the utility model without departing from the principles of the utility model, and these improvements and modifications are also within the protection scope of the utility model.

Claims

1. A full open mesh, characterized in that, The first screen and the second screen are arranged in close contact, the first screen is provided with a plurality of first grid line holes, the second screen is provided with second grid line holes, the first grid line holes and the second grid line holes are arranged correspondingly, the first grid line holes are not smaller than the second grid line holes, and the end face of the first screen away from the second screen is provided with a nano-imprint pattern.

2. A full open mesh screen according to claim 1, wherein, The nano-imprint pattern is convex or concave, the size of the nano-imprint pattern ranges from φ=1μm to 50μm, and the height or depth of the nano-imprint pattern ranges from 0μm to 5μm.

3. A full open mesh screen according to claim 1, wherein, The end face of the first screen away from the second screen is provided with a plurality of slurry storage grooves.

4. A full open mesh screen according to claim 1, wherein, The second grid line holes are provided with a plurality of slurry flow guide lines, the slurry flow guide lines are located on the end face of the second screen close to the first screen, and the slurry flow guide lines are communicated with the second grid line holes.

5. A full open mesh screen according to claim 4, wherein, The slurry flow guide lines have an inclination angle, the inclination direction of the slurry flow guide lines is opposite to the direction of the doctor blade printing, and the inclination angle ranges from 10° to 80°.

6. A full open mesh screen according to claim 5, wherein, The slurry flow guide lines are provided with the nano-imprint pattern.

7. A full open mesh screen according to claim 1, wherein, The shapes of the first grid line holes and the second grid line holes are one or a combination of more than one of a rectangle, a circle, a diamond, and an ellipse, and the shapes of the first grid line holes and the second grid line holes are arranged correspondingly.

8. A full open mesh screen according to any one of claims 1 to 7, wherein, The end face of the second screen away from the first screen is provided with a multi-layer metal plate structure, the multi-layer metal plate structure includes at least one metal plate, the metal plate is fixedly connected with the second screen through adhesive, and the multi-layer metal plate structure is provided with metal plate grid line holes corresponding to the second grid line holes.

9. A full open mesh screen according to claim 8, wherein, The outermost metal plate of the multi-layer metal plate structure away from the second screen is provided with a plastic film, and the plastic film is provided with plastic film grid line holes corresponding to the metal plate grid line holes.

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