CN114953717A - Scraping strip for screen printing of photovoltaic cell and printing method of photovoltaic cell pattern - Google Patents

Scraping strip for screen printing of photovoltaic cell and printing method of photovoltaic cell pattern Download PDF

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Publication number
CN114953717A
CN114953717A CN202210804916.7A CN202210804916A CN114953717A CN 114953717 A CN114953717 A CN 114953717A CN 202210804916 A CN202210804916 A CN 202210804916A CN 114953717 A CN114953717 A CN 114953717A
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CN
China
Prior art keywords
pattern
area
pattern area
photovoltaic cell
screen printing
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Pending
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CN202210804916.7A
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Chinese (zh)
Inventor
马杰华
刘尧平
李子
陈伟
肖川
杜小龙
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Institute of Physics of CAS
Songshan Lake Materials Laboratory
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Songshan Lake Materials Laboratory
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Priority to CN202210804916.7A priority Critical patent/CN114953717A/en
Publication of CN114953717A publication Critical patent/CN114953717A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F15/00—Screen printers
    • B41F15/14—Details
    • B41F15/44—Squeegees or doctors
    • B41F15/46—Squeegees or doctors with two or more operative parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/12—Stencil printing; Silk-screen printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/26—Printing on other surfaces than ordinary paper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2200/00—Printing processes
    • B41P2200/40—Screen printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2215/00—Screen printing machines
    • B41P2215/10—Screen printing machines characterised by their constructional features
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2215/00—Screen printing machines
    • B41P2215/50—Screen printing machines for particular purposes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Printing Methods (AREA)

Abstract

The application provides a scraping strip for screen printing of a photovoltaic cell and a printing method of patterns of a photovoltaic cell, and relates to the field of photovoltaic cell preparation. The screen printing plate is provided with a pattern area and a non-pattern area along a preset direction, the non-pattern area is located at the edge of the pattern area, and at least part of the pattern area is hollow. The scraping bar is provided with a scraping plane used for being in contact with the screen printing plate, the scraping plane is provided with a first area corresponding to the pattern area and a second area corresponding to the non-pattern area, and the hardness of the first area is smaller than that of the second area. The printing method of the scraping strip and the photovoltaic cell pattern can solve the technical problems of low printing quality and easy-to-explode plate leakage in the screen printing process.

Description

Scraping strip for screen printing of photovoltaic cell and printing method of photovoltaic cell pattern
Technical Field
The application relates to the field of photovoltaic cell preparation, in particular to a scraping strip for screen printing of a photovoltaic cell and a printing method of patterns of a photovoltaic cell.
Background
At present, a scraper is generally used in screen printing of a photovoltaic cell, and a required pattern is formed on the surface of the photovoltaic cell through a screen by using the moving and squeezing action of the scraper, but in the actual use process, poor printing phenomena such as thick printing lines and whitening exist in the screen printing of the photovoltaic cell, so that the printing quality of the photovoltaic cell is low, and explosion (screen cracking) and slurry leakage are easily caused, and the production cost is increased.
Disclosure of Invention
An object of the embodiment of the application is to provide a scraper bar for screen printing of a photovoltaic cell and a printing method of a pattern of a photovoltaic cell, which can solve the technical problems of low printing quality and easy-to-explode plate paste leakage in the screen printing process.
In a first aspect, an embodiment of the present application provides a wiper strip for screen printing of a photovoltaic cell, in which a screen has a pattern region and a non-pattern region along a preset direction, the non-pattern region is located at an edge of the pattern region, and at least a part of the pattern region is hollowed out.
The scraping bar is provided with a scraping plane used for being in contact with the screen printing plate, the scraping plane is provided with a first area corresponding to the pattern area and a second area corresponding to the non-pattern area, and the hardness of the first area is smaller than that of the second area.
In the implementation process, the screen printing plate is provided with the pattern area and the non-pattern area along the preset direction, namely the first area and the second area are distributed along the preset direction, so that the first area and the second area cannot interfere with each other along with the movement of the scraper bar in the process of applying the scraper bar to the screen printing plate. The hardness of the first area is smaller than that of the second area, so that the deformation of the pattern area and the deformation of the non-pattern area of the screen printing plate are basically the same under the action of printing pressure in actual use, the excessive ink amount of printing slurry in the pattern area is basically the same, the slurry is prevented from collapsing, the printing burrs are reduced, the deformation of the non-pattern area of the screen printing plate, which is larger than that of the pattern area, is relieved and avoided, the problems of slurry leakage, printing thick lines, whitening, poor printing and the like and plate explosion are caused easily are caused, the service life of the screen printing plate is prolonged, and the yield of printed photovoltaic cell plates is improved. In addition, when the scraping strip for screen printing of the photovoltaic cell is adopted to print patterns of the photovoltaic cell, the height of the patterns printed on the surface of the photovoltaic cell can be effectively increased, and the conversion efficiency of the photovoltaic cell is effectively improved.
In one possible embodiment, the pattern area is completely hollowed out.
In the implementation process, the whole hollowed-out parts are beneficial to further improving the printing quality.
In one possible embodiment, the first region has a hardness of 40A to 65A.
In the implementation process, the hardness of the first area in the range is reasonable, the service life of the screen printing plate can be prolonged, and the yield of the printed photovoltaic cell can be improved.
In one possible embodiment, the hardness of the second region is from 50A to 80A.
In the implementation process, the hardness of the second area in the range is reasonable, the service life of the screen printing plate can be prolonged, and the yield of the printed photovoltaic cell can be improved.
In one possible embodiment, the first region and the second region are of different materials.
In the implementation process, different material choices are utilized to realize the difference of the hardness of the first area and the second area.
In one possible embodiment, the first region and the second region are made of the same material.
In the implementation process, the same material is used, different hardness of the first region and the second region is achieved based on different blending modes, forming temperatures and the like, and the material is the same, so that the forming is easy.
In a possible embodiment, the first region and the second region are both made of polyurethane.
In the implementation process, the hardness of the first region and the hardness of the second region are different by utilizing polyurethane based on different blending modes or molding temperatures and the like, and the polyurethane has good stability, chemical resistance, resilience and mechanical properties and is convenient to obtain.
In one possible embodiment, the width of the first area in the predetermined direction is larger than or equal to the width of the pattern area in the predetermined direction.
In the implementation process, the width of the first area in the preset direction is larger than or equal to that of the pattern area in the preset direction, so that a better coating and scraping effect is obtained.
In a possible embodiment, the scraper bar is provided with a scraper bar body and a positioning plate with uniform hardness, the positioning plate is connected with the scraper bar body, and the scraping plane is positioned on one surface of the scraper bar body, which is deviated from the positioning plate.
In the implementation process, the positioning plate with uniform hardness is arranged so as to apply printing pressure to the scraping strip, so that the force applied to each position of the scraping strip body is uniformly distributed, and the reduction of printing quality caused by uneven distribution of the printing pressure is avoided.
In a second aspect, an embodiment of the present application provides a method for printing a pattern on a photovoltaic cell sheet, which includes: placing a photovoltaic cell piece to be printed under a screen printing plate, wherein the screen printing plate is provided with a pattern area and a non-pattern area along a preset direction, the non-pattern area is located at the edge of the pattern area, and at least part of the pattern area is hollow.
The printing paste is placed on a screen.
The scraping strip provided by the first aspect of the application is used for moving on a screen printing plate to carry out coating scraping, the first area corresponds to a pattern area and the second area corresponds to a non-pattern area in the moving process, so that printing slurry forms a pattern corresponding to the hollow of the pattern area on the surface of a photovoltaic cell piece through the screen printing plate, and the moving direction of the scraping strip is perpendicular to the preset direction.
By adopting the printing method of the patterns of the photovoltaic cell, the equipment investment and the printing steps are not increased, the printing quality can be obviously improved, and the printing reject ratio is reduced.
When the scraping bar moves on the screen printing plate to scrape, the first area corresponds to the pattern area and the second area corresponds to the non-pattern area in the moving process, so that the pattern area and the non-pattern area of the screen printing plate deform basically under the action of printing pressure by using the fact that the hardness of the first area is smaller than that of the second area, so that the printing amount of printing slurry in the pattern area is basically the same, the slurry is prevented from collapsing, printing burrs are reduced, the service life of the screen printing plate is prolonged, and the yield of printed photovoltaic cell plates is improved. In addition, when the scraping strip for screen printing of the photovoltaic cell is adopted to print patterns of the photovoltaic cell, the height of the patterns printed on the surface of the photovoltaic cell can be effectively increased, and the conversion efficiency of the photovoltaic cell is effectively improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 is a schematic view of a screen printing plate provided in embodiment 1 of the present application;
fig. 2 is a schematic structural view of a wiper strip provided in embodiment 1 of the present application;
fig. 3 is a schematic view of a screen printing plate provided in embodiment 2 of the present application;
fig. 4 is a schematic structural diagram of a wiper strip provided in embodiment 2 of the present application.
Icon: 10-scraping strip; 100-bar body; 101-coating and scraping plane; 103-a first area; 105-a second region; 110-a positioning plate; 20-screen printing; 201-pattern area; 203-non-pattern area.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the application usually place when in use, and are used only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the devices or elements being referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present application, it is further noted that, unless expressly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
The photovoltaic cell screen printing usually uses a scraper, and the movement and extrusion action of the scraper is utilized to enable the printing slurry to form a required pattern on the surface of the photovoltaic cell through the screen, but in the actual use process, the photovoltaic cell screen printing usually has poor printing phenomena such as thick printing lines, whitening and the like, so that the printing quality of the photovoltaic cell is low, and the phenomena of plate explosion (screen cracking) and slurry leakage are easily caused, so that the production cost is increased.
The inventor researches the problems and finds that the reasons are mainly that: hardness everywhere of current scraper blade is the same, when adopting above-mentioned scraper blade to carry out photovoltaic cell screen printing, because the edge that usually non-pattern district is located the pattern district is in order to enclose and locate the pattern district, exert even printing pressure to the scraper blade this moment, but still make the deformation in screen pattern district and non-pattern district inequality, the edge that is located the pattern district will receive bigger printing pressure and lead to its deformation bigger, thereby lead to the screen plate to leak thick liquid and cause and lead to printing thick line, turn white and the bad phenomenon of printing such as, and lead to exploding the version easily, in addition, above-mentioned scraper blade also can influence the height of the pattern that obtains when carrying out photovoltaic cell screen printing.
Based on this, the inventor tries to improve the squeegee, partition the squeegee to make it have a first area corresponding to the pattern area and a second area corresponding to the non-pattern area, and then, aiming at the phenomenon that the non-pattern area at the edge of the pattern area will be subjected to a larger printing pressure to cause a larger deformation during the actual printing process, pertinently make the hardness of the first area smaller than that of the second area, so that during the printing process, the hardness of the first area is smaller than that of the second area, so as to make the deformations of the pattern area and the non-pattern area of the screen substantially consistent during the printing process, thereby alleviating the problems of poor printing caused by screen paste leakage, such as thick lines, whiting and plate explosion, and in practical use, finding that under the same printing conditions, the obtained pattern is printed by comparing with the prior squeegee with the same hardness, the scraper blade after adopting this application to improve is favorable to improving the height of the pattern of the surface printing of photovoltaic cell piece, can improve photovoltaic cell piece's solar energy conversion efficiency.
The application provides a photovoltaic cell is scraping strip for screen printing, should scrape the strip promptly and be applicable to with the screen cooperation in order to carry out the printing pattern to the surface of photovoltaic cell piece.
The screen printing plate is also called a silk screen, and in the application, the screen printing plate is matched with the scraper in use according to the screen printing plate, so that the screen printing plate is positioned on the screen printing plate and is vertical to the moving direction of the scraper to be used as a preset direction, the screen printing plate is provided with a pattern area and a non-pattern area along the preset direction, the non-pattern area is positioned on the edge of the pattern area, and at least part of the pattern area is hollowed out.
The setting mode of at least partial fretwork in pattern district includes the mode that the pattern district is whole fretwork, also includes the partial fretwork in pattern district, and remaining part is not fretwork and keeps the mode of leveling with the surface in non-pattern district.
Optionally, in some embodiments, the pattern region is completely hollowed out. The whole hollowed-out part is beneficial to further improving the printing quality.
It should be noted that the hollow-out shape of the pattern area can be various, so that various patterns can be presented, and those skilled in the art can set the hollow-out shape according to actual requirements.
Optionally, the orthographic projection of the hollow part of the pattern region on the horizontal plane is a fine grid line pattern, a main grid line pattern, a back electrode pattern or a back electric field pattern. The screen printing method is characterized in that different patterns are formed by utilizing the orthographic projection of the hollow parts of the pattern areas on the horizontal plane, so that the scraping strip for the screen printing of the photovoltaic cell not only can be used for printing fine grids, but also can be used for printing main grids, back electrodes and back electric field patterns, and the screen printing method is wide in application range.
The scraping bar is provided with a scraping plane used for being in contact with the screen printing plate, the scraping plane is provided with a first area corresponding to the pattern area and a second area corresponding to the non-pattern area, and the hardness of the first area is smaller than that of the second area.
That is, the first region and the second region are distributed along the predetermined direction, and the second region is located at the edge of the first region.
In the implementation process, the hardness of the first area is smaller than that of the second area, so that the deformation of the pattern area and the deformation of the non-pattern area of the screen printing plate are basically the same under the action of printing pressure in actual use, the ink passing amount of printing slurry in the pattern area is basically the same, the slurry collapse is prevented, the printing burr is reduced, the problem that slurry leakage and poor printing phenomena such as thick lines, white spots and the like are caused due to the fact that the deformation of the non-pattern area of the screen printing plate is larger than that of the pattern area can be relieved and avoided, and the problem that the screen printing plate is easy to explode is caused, the service life of the screen printing plate is prolonged, and the yield of the printed photovoltaic cell is improved. In addition, when the scraping strip for screen printing of the photovoltaic cell is adopted to print patterns of the photovoltaic cell, the height of the patterns printed on the surface of the photovoltaic cell can be effectively increased, and the conversion efficiency of the photovoltaic cell is effectively improved.
It can be understood that, because the thin grid lines are densely distributed and thin, the preparation difficulty of scraping the strip so as to reduce the strip is scraped in order to facilitate subsequent preparation, the region where a plurality of thin grid lines are located can be integrally taken as a pattern region at the moment, and the pattern region is partially hollowed out and the hollowed-out orthographic projection of the pattern region is a thin grid line pattern. The back electrode is distributed dispersedly and has larger size, at the moment, the pattern areas can be completely hollowed out, the number of the pattern areas corresponds to the number of the electrodes to be charged one by one, and at the moment, the orthographic projection of the pattern areas on the horizontal plane is a back electrode pattern. Other main grid line patterns and back electric field patterns can be manually distinguished in a pattern area and a non-pattern area by referring to the setting mode, so that the scraping strip can be conveniently processed subsequently.
In order to better realize the blade coating effect, the width of the first area in the preset direction is more than or equal to that of the pattern area in the preset direction.
Optionally, the number of the first regions is at least one, the number of the second regions is multiple, for example, two, three, four, and so on, and the first regions and the second regions are alternately distributed along the preset direction.
Optionally, the first region has a hardness of 40A-65A. The hardness of the first area in the range is reasonable, so that the service life of the screen printing plate can be prolonged, and the yield of the printed photovoltaic cell can be improved.
Illustratively, the first region has a hardness of any one of, or between any two of, 40A, 43A, 45A, 47A, 50A, 53A, 55A, 57A, 60A, 63A, 65A.
In one possible embodiment, the hardness of the second region is from 50A to 80A. The hardness of the second area in the range is reasonable, the service life of the screen printing plate can be prolonged, and the yield of the printed photovoltaic cell can be improved.
Illustratively, the second region has a hardness of any one of or between any two of 50A, 53A, 55A, 57A, 60A, 63A, 65A, 67A, 70A, 73A, 75A, 78A, 80A.
In order to achieve a difference in the stiffness of the first and second regions, in a possible embodiment the first and second regions are of different material. In the implementation process, different material choices are utilized to realize the difference of the hardness of the first area and the second area.
In another embodiment, the first region and the second region are made of the same material. In the implementation process, the same material is used, different hardness of the first region and the second region is achieved based on different blending modes, forming temperatures and the like, and the material is the same, so that the forming is easy.
In a possible embodiment, the first region and the second region are both made of polyurethane.
Polyurethane (PU), which is a high molecular compound, is well known as polyurethane, has good stability, chemical resistance, resilience, and mechanical properties, and is easy to obtain. In the implementation process, the first region and the second region are made of the same material, and different hardness of the first region and the second region can be achieved by using different blending modes or molding temperatures of polyurethane according to hardness requirements of different regions.
In practical use, the scraper bar is generally installed on a printing machine, the printing machine controls the scraper bar to move on the screen printing plate through certain printing parameters, and certain printing pressure is applied to the screen printing plate, so that optionally, the scraper bar is provided with a scraper bar body and a positioning plate with uniform hardness, the positioning plate is connected with the scraper bar body, and the scraping plane is located on one surface of the scraper bar body, which is far away from the positioning plate. The locating plate is used for being connected with the printing machine. Utilize the setting of the locating plate of hardness homogeneity so that exert printing pressure to the scraping strip, be favorable to making to exert the power evenly distributed in the scraping strip body each department, avoid reducing because of the printing quality that printing pressure distributes the inequality and leads to, at the in-process of preparation scraping strip this moment, need not to consider the locating plate, only need change means such as the material or the forming temperature of scraping the strip body to the hardness that makes scribble the first region of scraping the plane and the second region can in target hardness scope.
Alternatively, the positioning plate may be provided with positioning holes or the like so as to be accurately mounted on the printing machine, which is not limited herein.
It will be appreciated that the locating plate may have a hardness equal to the hardness of the second region to facilitate the application of pressure to avoid deformation, and optionally greater than the hardness of the second region to facilitate stable mounting on the printer.
The application also provides a printing method of the pattern of the photovoltaic cell piece, which comprises the following steps:
s1, placing the photovoltaic cell piece to be printed under a screen printing plate, wherein the screen printing plate is provided with a pattern area and a non-pattern area along a preset direction, the non-pattern area is located at the edge of the pattern area, and at least part of the pattern area is hollowed out.
S2, placing the printing slurry on the screen;
s3, the scraper bar provided by the application is used for moving on the screen printing plate to carry out coating scraping, the first area corresponds to the pattern area and the second area corresponds to the non-pattern area in the moving process, so that the printing slurry forms a pattern corresponding to the hollow-out of the pattern area on the surface of the photovoltaic cell piece through the screen printing plate, and the moving direction of the scraper bar is perpendicular to the preset direction.
Optionally, the screen is a composite screen formed by compounding, exposing and developing a steel mesh and an emulsion.
The pattern corresponding to the hollow-out of the pattern area is formed on the surface of the photovoltaic cell piece by the printing paste through the screen printing plate, and can be a fine grid line pattern, a main grid line pattern, a back electrode pattern or a back electric field pattern, which is not limited herein.
The printing method includes, but is not limited to, primary printing, secondary printing, and the like.
The printing paste may be any one of silver paste, aluminum paste, and silver-aluminum paste, which is not limited herein, that is, the screen printing plate is provided with a pattern area and a non-pattern area for forming a specific metal pattern on the surface of the photovoltaic cell, so that the printing paste finally forms a metal pattern corresponding to the hollowing of the pattern area on the surface of the photovoltaic cell through the screen printing plate.
The doctor blade for screen printing of photovoltaic cells and the method for printing a pattern on a photovoltaic cell sheet according to the present application will be described in further detail with reference to the following examples.
Example 1
Referring to fig. 1 and 2, the predetermined direction is shown in the X direction in fig. 1 and 2, and the Y direction is the moving direction of the scraper bar 10.
The metal pattern of the photovoltaic cell to be printed is a single-time printing front pattern, the size of the cell is 158.75mm by 158.75mm, the screen 20 is provided with the front pattern, and the front pattern is provided with a pattern area 201 and non-pattern areas 203 positioned at two edges of the front pattern along a preset direction. The pattern region 201 comprises 102 fine grid lines, 9 main grid lines and 157.005mm width in the preset direction of the pattern region 201.
The scraper bar 10 is provided with a scraper bar body 100 and a positioning plate 110, the lengths of the scraper bar body 100 and the positioning plate 110 in a preset direction are equal and both 180mm, one surface of the scraper bar body 100, which is far away from the positioning plate 110, is a scraping plane 101, the scraping plane 101 is provided with a first area 103 corresponding to a pattern area 201 and a second area 105 corresponding to a non-pattern area 203, the width of the first area 103 in the preset direction is 157.005mm, and the widths of the two sections of the second areas 105 in the preset direction are 11.4975mm respectively.
The first region 103 has a hardness of 55A. The hardness of the second region 105 of the wiper strip 10 is 70A, and the first region 103 and the second region 105 are both made of polyurethane.
The printing method of the metal pattern of the photovoltaic cell piece comprises the following steps:
and placing the photovoltaic cell piece after film coating under the screen plate 20 with the front pattern.
The front electrode paste is placed on the screen 20.
The positioning plate 110 is installed on a printing machine, the printing machine controls the scraper bar 10 to move on the screen 20 along a direction perpendicular to the preset direction through certain printing parameters, the front electrode slurry is extruded by the scraper bar 10 and penetrates through the screen 20 to form a positive electrode pattern of the battery piece, and the positions of the pattern areas 201 of the scraper bar 10 correspond to the positions of the metal patterns of the battery piece one by one.
The screen 20 is a composite screen formed by combining a steel mesh and an emulsion, exposing, and developing.
Printing parameters: the printing pressure was 75N, the printing speed was 300mm/s, the mesh size of the screen 20 was 430 mesh, the filament diameter was 13 microns, the thickness of the screen was 17 microns, and the thickness of the emulsion was 12 microns. The front electrode paste was Helrich SOL9661B with a viscosity of 101 kcps.
The line height after the metal pattern of the battery piece is sintered and molded is 18 microns.
Example 2
Referring to fig. 3 and 4, the predetermined direction is shown in the X direction in fig. 3 and 4, and the Y direction is the moving direction of the scraper bar 10.
The metal pattern of the photovoltaic cell to be printed is a back electrode pattern, the size of the cell is 158.75mm, since the total number of the back electrodes is 9, each 6 segments, namely the screen 20 is provided with the back electrode pattern, the back electrode pattern has a total of 6 pattern areas 201 and non-pattern areas 203 positioned at two edges of each pattern area 201 along a preset direction, and the number of the non-pattern areas 203 is 5. Each pattern area 201 is arranged in a hollow mode and corresponds to the number of segments of the back electrode one by one, the width of each pattern area 201 in the preset direction is 4.8mm, and the width of each non-pattern area 203 in the preset direction is 21.2 mm.
The scraper bar 10 is provided with a scraper bar body 100 and a positioning plate 110, the lengths of the scraper bar body 100 and the positioning plate 110 in a preset direction are equal and both 180mm, one surface of the scraper bar body 100, which is far away from the positioning plate 110, is a scraping plane 101, the scraping plane 101 is provided with a first area 103 corresponding to a pattern area 201 and a second area 105 corresponding to a non-pattern area 203, the width of the first area 103 in the preset direction is 4.8mm, and the widths of the two sections of second areas 105 in the preset direction are 21.2mm respectively.
The first region 103 has a hardness of 60A. The hardness of the second region 105 of the wiper strip 10 is 75A, and the first region 103 and the second region 105 are both made of polyurethane.
The printing method of the metal pattern of the photovoltaic cell piece comprises the following steps:
and placing the photovoltaic cell piece after film coating under the screen printing plate 20 printed with the front pattern.
The back electrode printing paste is placed on the screen 20.
The positioning plate 110 is installed on a printing machine, the printing machine controls the scraper bar 10 to move on the screen 20 along a direction perpendicular to the preset direction through certain printing parameters, the printing slurry of the back electrode is extruded by the scraper bar 10 and penetrates through the screen 20 to form a back electrode pattern of the battery piece, and the positions of the pattern areas 201 of the scraper bar 10 correspond to the positions of the metal patterns formed on the battery piece one by one.
The screen 20 is a composite screen formed by combining a steel mesh and an emulsion, exposing, and developing.
Printing parameters: the printing pressure is 65N, the printing speed is 350mm/s, the mesh number of the screen plate is 325 meshes, the silk diameter is 28 micrometers, the thickness of the gauze is 50 micrometers, and the thickness of the emulsion is 10 micrometers. The back electrode printing paste is Youle SA-6171D62G2, and the viscosity is 39 Pa.s.
The line height of the photovoltaic cell sheet after the metal pattern is sintered and molded is 10 microns.
Comparative example 1
It differs from example 1 only in that: the hardness of the first region is the same as the hardness of the second region, and is 55A.
The line height of the photovoltaic cell sheet after the metal pattern is sintered and molded is 14 microns.
In example 1, the screen life was increased from 10 ten thousand printing times to 12 ten thousand printing times as compared with comparative example 1. That is, compared with the comparative example 1, the service life of the screen printing plate in the embodiment 1 is effectively prolonged, the number of times of stopping the screen printing plate to repair the slurry leakage every day is also obviously reduced, and the productivity is effectively improved.
Comparative example 2
It differs from example 2 only in that: the hardness of the first region was the same as the hardness of the second region, and was 75A.
The line height after the photovoltaic cell metal pattern is sintered and molded is 8 microns.
In example 2, the screen life was increased from 200 ten thousand printing times to 300 ten thousand printing times, as compared with comparative example 2. That is, compared with the comparative example 2, the service life of the screen printing plate is effectively prolonged, the number of times of stopping the screen printing plate to repair the slurry leakage is also obviously reduced every day, and the productivity is effectively improved.
In conclusion, the improvement of structure is utilized to photovoltaic cell screen printing with scraping strip that this application provided not only can increase the height of the metal pattern of formation on the photovoltaic cell piece at the printing in-process of photovoltaic cell piece pattern, prevents that the thick liquids from collapsing, reduces printing burr and hourglass thick liquid, and then promotes cell piece solar energy conversion efficiency, can effectively reduce the screen printing and explode the version rate moreover, has improved the life of screen printing. By adopting the preparation method of the battery piece pattern by the scraping strip screen printing, the equipment investment and the printing steps are not increased, the printing quality can be obviously improved, and the printing reject ratio is reduced.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. The scraper bar for screen printing of the photovoltaic cell is characterized in that the screen printing plate is provided with a pattern area and a non-pattern area along a preset direction, the non-pattern area is located at the edge of the pattern area, and at least part of the pattern area is hollowed out;
the scraping strip is provided with a scraping plane used for being in contact with a screen printing plate, the scraping plane is provided with a first area corresponding to the pattern area and a second area corresponding to the non-pattern area, and the hardness of the first area is smaller than that of the second area.
2. The doctor blade as claimed in claim 1, wherein the pattern area is completely hollowed out.
3. The wiper strip of claim 1 wherein the first region has a hardness of 40A to 65A.
4. The wiper strip of claim 1 wherein the hardness of the second region is 50A-80A.
5. The wiper strip of any of claims 1-4 wherein the first region is of a different material than the second region.
6. The wiper strip of any of claims 1-4 wherein the first region and the second region are of the same material.
7. The wiper strip of any of claims 1-4 wherein the first region and the second region are both polyurethane.
8. The wiper strip according to any of claims 1-4, wherein the width of the first area in a predetermined direction is larger than or equal to the width of the pattern area in a predetermined direction.
9. The scraper bar of any one of claims 1-4 wherein said scraper bar has a scraper bar body and a positioning plate of uniform hardness, said positioning plate is connected to said scraper bar body, and said scraping plane is located on a side of said scraper bar body facing away from said positioning plate.
10. A printing method of a photovoltaic cell pattern is characterized by comprising the following steps:
placing a photovoltaic cell piece to be printed under a screen printing plate, wherein the screen printing plate is provided with a pattern area and a non-pattern area along a preset direction, the non-pattern area is positioned at the edge of the pattern area, and at least part of the pattern area is hollowed out;
placing printing slurry on the screen;
moving the scraper bar according to claims 1-9 on the screen printing plate for coating, wherein the first area corresponds to the pattern area and the second area corresponds to the non-pattern area during the moving process, so that the printing slurry forms a pattern corresponding to the hollowing out of the pattern area on the surface of the photovoltaic cell piece through the screen printing plate;
wherein the moving direction of the scraping strip is vertical to the preset direction.
CN202210804916.7A 2022-07-08 2022-07-08 Scraping strip for screen printing of photovoltaic cell and printing method of photovoltaic cell pattern Pending CN114953717A (en)

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2765813A1 (en) * 1997-07-11 1999-01-15 Novatec SQUEEGEE FOR APPLICATION OF PRODUCTS PRESENTING A HIGH DEGREE OF VISCOSITY AND THIXOTROPIC CHARACTERISTICS ON A SUBSTRATE WHICH MAY PRESENT VARIATIONS IN HEIGHT, THROUGH A STENCIL, APPLIED TO SAID SUBSTRATE
JP2000185388A (en) * 1998-12-24 2000-07-04 Nec Kansai Ltd Screen printing machine
JP2003300301A (en) * 2002-04-10 2003-10-21 Matsushita Electric Ind Co Ltd Soldering printer
JP2005001315A (en) * 2003-06-13 2005-01-06 Mitsui Mining & Smelting Co Ltd Squeegee member
CN103448355A (en) * 2012-05-28 2013-12-18 株式会社日立高新技术 Method and apparatus for forming pattern
CN205951464U (en) * 2016-07-22 2017-02-15 佛山鹏德橡塑制品有限公司 Printing panel ink knife structure
CN107584880A (en) * 2017-09-29 2018-01-16 京东方科技集团股份有限公司 The method of the device and printed glass glue of scraper including scraper
CN113858776A (en) * 2021-09-14 2021-12-31 广东爱旭科技有限公司 Scraper for screen printing of photovoltaic cell and preparation method of cell fine grid

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2765813A1 (en) * 1997-07-11 1999-01-15 Novatec SQUEEGEE FOR APPLICATION OF PRODUCTS PRESENTING A HIGH DEGREE OF VISCOSITY AND THIXOTROPIC CHARACTERISTICS ON A SUBSTRATE WHICH MAY PRESENT VARIATIONS IN HEIGHT, THROUGH A STENCIL, APPLIED TO SAID SUBSTRATE
JP2000185388A (en) * 1998-12-24 2000-07-04 Nec Kansai Ltd Screen printing machine
JP2003300301A (en) * 2002-04-10 2003-10-21 Matsushita Electric Ind Co Ltd Soldering printer
JP2005001315A (en) * 2003-06-13 2005-01-06 Mitsui Mining & Smelting Co Ltd Squeegee member
CN103448355A (en) * 2012-05-28 2013-12-18 株式会社日立高新技术 Method and apparatus for forming pattern
CN205951464U (en) * 2016-07-22 2017-02-15 佛山鹏德橡塑制品有限公司 Printing panel ink knife structure
CN107584880A (en) * 2017-09-29 2018-01-16 京东方科技集团股份有限公司 The method of the device and printed glass glue of scraper including scraper
CN113858776A (en) * 2021-09-14 2021-12-31 广东爱旭科技有限公司 Scraper for screen printing of photovoltaic cell and preparation method of cell fine grid

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