CN112721417A - Printing stencil for solar cell and manufacturing process thereof - Google Patents
Printing stencil for solar cell and manufacturing process thereof Download PDFInfo
- Publication number
- CN112721417A CN112721417A CN202011405331.5A CN202011405331A CN112721417A CN 112721417 A CN112721417 A CN 112721417A CN 202011405331 A CN202011405331 A CN 202011405331A CN 112721417 A CN112721417 A CN 112721417A
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- Prior art keywords
- mesh
- grid
- solar cell
- mesh cloth
- stencil
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 239000004744 fabric Substances 0.000 claims abstract description 75
- 238000000034 method Methods 0.000 claims abstract description 22
- 239000000463 material Substances 0.000 claims abstract description 18
- 238000010147 laser engraving Methods 0.000 claims abstract description 7
- 239000012528 membrane Substances 0.000 claims abstract description 4
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 238000013329 compounding Methods 0.000 claims description 4
- 239000004677 Nylon Substances 0.000 claims description 3
- 239000000839 emulsion Substances 0.000 claims description 3
- 238000005530 etching Methods 0.000 claims description 3
- 238000013507 mapping Methods 0.000 claims description 3
- 229920001778 nylon Polymers 0.000 claims description 3
- 229920000728 polyester Polymers 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 238000012546 transfer Methods 0.000 claims description 3
- 238000011161 development Methods 0.000 claims description 2
- 238000007689 inspection Methods 0.000 claims description 2
- 238000005323 electroforming Methods 0.000 claims 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 abstract description 9
- 229910052709 silver Inorganic materials 0.000 abstract description 9
- 239000004332 silver Substances 0.000 abstract description 9
- 238000010329 laser etching Methods 0.000 abstract description 4
- 230000035515 penetration Effects 0.000 abstract description 4
- 238000003466 welding Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F15/00—Screen printers
- B41F15/14—Details
- B41F15/34—Screens, Frames; Holders therefor
- B41F15/36—Screens, Frames; Holders therefor flat
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C1/00—Forme preparation
- B41C1/02—Engraving; Heads therefor
- B41C1/04—Engraving; Heads therefor using heads controlled by an electric information signal
- B41C1/05—Heat-generating engraving heads, e.g. laser beam, electron beam
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C1/00—Forme preparation
- B41C1/14—Forme preparation for stencil-printing or silk-screen printing
-
- 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
- B41P2217/00—Printing machines of special types or for particular purposes
- B41P2217/50—Printing presses for particular purposes
Abstract
The invention discloses a printing stencil for a solar cell and a manufacturing process thereof, which comprises a first mesh and a second mesh which are arranged in sequence, wherein a mesh frame is arranged on the periphery of the second mesh; the first mesh cloth comprises a first mesh area and a plurality of second mesh areas; the second grid areas are uniformly distributed in the first mesh cloth, and the number of the grid meshes of the second grid areas is less than or equal to that of the first grid areas; the first mesh cloth is provided with a membrane material, and a main grid and an auxiliary grid which are mutually crossed; the main grid is formed by connecting fine lines in series with bonding pads, and the second grid area is located at the position of the bonding pads. According to the printing stencil for the solar cell, the screen gauze at the main grid pad position is selectively removed by adopting a laser engraving or etching process, so that different mesh numbers of the first grid area and the second grid area are realized, the ink penetration amount at the main grid pad position is increased, the height of printing silver paste is increased, the smoothness is improved, and meanwhile, the printing of the auxiliary grid is not influenced.
Description
Technical Field
The invention relates to the technical field of printing screens, in particular to a printing stencil for a solar cell and a manufacturing process thereof.
Background
In the traditional solar cell, the number of the main grids is generally 4-6, and the width of the main grids is designed to be 0.5-1 mm. In order to further reduce the light shielding area of the surface of the solar cell and the consumption of the main grid silver paste, MBB cell design is rapidly applied and increased in the market in recent years, and the market proportion is over 50% in 2020. The MBB battery has 9-15 main grids, the main grids are designed by connecting thin wires in series with 10-18 bonding pads, the width of the thin wires is designed to be 0.04-0.08mm, and the bonding pads are designed to be rectangles or other polygons in the range of 0.6-1.4 mm.
The MBB cell main grid is designed into a fine line and a bonding pad. When the assembly is packaged, the round welding rod is welded on the welding disc of the main grid to form current conduction between the battery pieces. However, the adoption of the round welding rod can cause the welding tension to be lower or cause insufficient welding, and the welding rod is easy to fall off. Therefore, the silver paste at the position of the bonding pad is high in height and small in fluctuation. The traditional method is to reduce the mesh number and the wire diameter of the screen cloth of the printing stencil, improve the yarn thickness and the film thickness of the screen cloth, thus improving the height of the silver paste at the position of the main grid pad and reducing the undulation degree. But the influence on the auxiliary grid lines on the same template is large, the printing performance of the auxiliary grid lines is reduced, the printing width is increased, and the unit consumption of silver paste is increased and the overall conversion efficiency is reduced. If the primary grid and the secondary grid are printed separately, this can increase equipment costs, administrative costs, and stencil costs.
Based on the situation, the invention provides a printing stencil for a solar cell and a manufacturing process thereof, which can effectively solve the problems.
Disclosure of Invention
The invention aims to provide a printing stencil for a solar cell and a manufacturing process thereof. The printing stencil for the solar cell and the manufacturing process thereof have the advantages that the structure is simple, the use is convenient, the screen gauze at the position of the main grid pad is selectively removed by adopting a laser engraving or etching process, the different mesh numbers of the first grid area and the second grid area are realized, the mesh number at the position of the main grid pad is reduced in the printing process, the ink penetration amount is increased, the height of printed silver paste is increased, the smoothness is improved, and meanwhile, the printing of the auxiliary grid is not influenced.
The invention is realized by the following technical scheme:
a printing stencil for a solar cell comprises a first mesh and a second mesh which are arranged in sequence, wherein a mesh frame is arranged on the periphery of the second mesh;
the first mesh cloth comprises a first mesh area and a plurality of second mesh areas; the second grid areas are uniformly distributed in the first mesh cloth, and the number of the grid meshes of the second grid areas is less than or equal to that of the first grid areas;
the first mesh cloth is provided with a membrane material, and a main grid and an auxiliary grid which are mutually crossed; the main grid is formed by connecting fine lines in series with bonding pads, and the second grid area is located at the position of the bonding pads.
The invention aims to provide a printing stencil for a solar cell and a manufacturing process thereof. The printing stencil for the solar cell and the manufacturing process thereof have the advantages that the structure is simple, the use is convenient, the screen gauze at the position of the main grid pad is selectively removed by adopting a laser engraving or etching process, the different mesh numbers of the first grid area and the second grid area are realized, the mesh number at the position of the main grid pad is reduced in the printing process, the ink penetration amount is increased, the height of printed silver paste is increased, the smoothness is improved, and meanwhile, the printing of the auxiliary grid is not influenced.
According to another aspect of the present invention, there is provided a process for manufacturing a printing stencil for a solar cell, characterized in that:
step S1: compounding the first mesh cloth with a second mesh cloth;
step S2: stretching the compounded mesh cloth on a net stretching device to a certain tension, and bonding the stretched mesh cloth on a net frame with the tension of 0-50N/cm2；
Step S3: coating a film material on the first mesh cloth;
step S4: transferring the solar cell printing pattern to the first screen cloth, and forming a stencil plate, wherein the screen yarns in the bonding pad are vertically crossed or crossed at any angle;
step S5: and selectively removing the gauze in the pad.
Preferably, the first mesh cloth and the second mesh cloth are both one of polyester mesh cloth, nylon mesh cloth, stainless steel mesh cloth or electroformed gauze.
Preferably, the included angles between the first mesh cloth and the horizontal position and the included angles between the second mesh cloth and the horizontal position are both 0-180 degrees.
Preferably, in the step S2, the tension is 10-30N/cm2。
Preferably, in step S3, the film material is one of a photosensitive emulsion, a photosensitive film and a non-photosensitive film.
Preferably, in the step S4, the solar cell printing pattern transfer mode is that the solar cell pattern is prepared on a film, the film is attached to a first mesh, then exposure is performed, and development is performed after the exposure is finished; or directly gasifying the film material at the position of the printed pattern of the solar cell by laser.
Preferably, in the step S5, the manner of selectively removing the gauze in the main grid pad is to place the stencil on the laser engraving device, identify the gauze in the pad according to a preset identification mark, and selectively remove the unnecessary gauze according to the requirement; or selectively etching to remove one of the part of the gauze according to the gauze position in the bonding pad measured by AL detection equipment or image mapping equipment.
Preferably, in the step S6, the removal degree of the gauze is that all the gauzes in a single direction in the pad are removed; or removing the gauze in the bonding pad in a single direction at intervals; or removing the gauze in two directions in the bonding pad at intervals; or partial removal of the gauze in both directions within the pad.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the printing stencil for the solar cell is simple in structure and convenient to use, and different mesh numbers of the first grid area and the second grid area are realized by selectively removing the gauze at the position of the main grid pad by adopting a laser engraving or etching process, so that the mesh number at the position of the main grid pad is reduced in the printing process, the ink penetration amount is increased, the height of printed silver paste is increased, the smoothness is improved, and meanwhile, the printing of the auxiliary grid is not influenced. The printing stencil is designed, the printing stencil is not influenced by the specification and parameters of the gauze of the secondary grid line printing design, the height and the smoothness of the printing pad slurry can be automatically adjusted and designed, and the reliability of the battery is greatly improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of a structure in which grid lines in a main grid are vertically crossed according to the present invention;
FIG. 3 is a schematic structural diagram of grid lines in the main grid crossing at any angle according to the present invention;
FIG. 4 is a schematic structural view of the bonding pad of the present invention after all grid lines in a single direction are removed;
fig. 5 is a schematic structural diagram of the pad after grid lines in two directions are removed at intervals.
Detailed Description
In order that those skilled in the art will better understand the technical solutions of the present invention, the following description of the preferred embodiments of the present invention is provided in conjunction with specific examples, but it should be understood that the drawings are for illustrative purposes only and should not be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.
Example 1:
as shown in fig. 1 to 5, the present invention provides a printing stencil for a solar cell, including a first mesh cloth 1 and a second mesh cloth 2 sequentially disposed, wherein a mesh frame 3 is disposed around the second mesh cloth; the first mesh cloth 1 and the second mesh cloth 2 are compounded, and the compounded mesh cloth is stretched to a certain tension on a net stretching device and then is bonded on the net frame 3.
The first mesh cloth 1 comprises a first mesh area 11 and a plurality of second mesh areas 12; the second grid areas 12 are uniformly distributed in the first mesh cloth 1, and the mesh number of the second grid areas 12 is less than or equal to that of the first grid areas 11;
the first mesh cloth 1 is coated with a film material, and a main grid 13 and an auxiliary grid 14 which are mutually crossed; the main grid 13 is formed by connecting fine wires 131 in series with pads 132, and the second grid region 12 is located where the pads 132 are located.
According to another aspect of the present invention, there is provided a process for fabricating a printing stencil for a solar cell,
step S1: compounding the first mesh cloth 1 and the second mesh cloth 2;
step S2: stretching the compounded mesh cloth on a net stretching device to a certain tension, and bonding the stretched mesh cloth on a net frame with the tension of 0-50N/cm2；
Step S3: coating a film material on the first mesh cloth 1;
step S4: transferring the solar cell printing pattern to the first mesh cloth 1, and forming a stencil plate, wherein the gauze in the bonding pad 132 is vertically crossed or crossed at any angle;
step S5: the screen in pad 132 is selectively removed.
Example 2:
as shown in fig. 1 to 5, the present invention provides a printing stencil for a solar cell, including a first mesh cloth 1 and a second mesh cloth 2 sequentially disposed, wherein a mesh frame 3 is disposed around the second mesh cloth; the first mesh cloth 1 and the second mesh cloth 2 are compounded, and the compounded mesh cloth is stretched to a certain tension on a net stretching device and then is bonded on the net frame 3.
The first mesh cloth 1 comprises a first mesh area 11 and a plurality of second mesh areas 12; the second grid areas 12 are uniformly distributed in the first mesh cloth 1, and the mesh number of the second grid areas 12 is less than or equal to that of the first grid areas 11;
the first mesh cloth 1 is coated with a film material, and a main grid 13 and an auxiliary grid 14 which are mutually crossed; the main grid 13 is formed by connecting fine wires 131 in series with pads 132, and the second grid region 12 is located where the pads 132 are located.
According to another aspect of the present invention, there is provided a process for fabricating a printing stencil for a solar cell,
step S1: compounding the first mesh cloth 1 and the second mesh cloth 2;
step S2: stretching the compounded mesh cloth on a net stretching device to a certain tension, and bonding the stretched mesh cloth on a net frame with the tension of 0-50N/cm2；
Step S3: coating a film material on the first mesh cloth 1;
step S4: transferring the solar cell printing pattern to the first mesh cloth 1, and forming a stencil plate, wherein the gauze in the bonding pad 132 is vertically crossed or crossed at any angle;
step S5: the screen in pad 132 is selectively removed.
Further, in another embodiment, the first mesh cloth 1 and the second mesh cloth 2 are both one of polyester mesh cloth, nylon mesh cloth, stainless steel mesh cloth, or electroformed mesh cloth.
Further, in another embodiment, the included angles between the first mesh cloth 1 and the second mesh cloth 2 and the horizontal position are both 0-180 °.
Further, in another embodiment, in the step S2, the tension is 10-30N/cm2。
The printing tension is an important parameter of the printing process and is set according to the substrate material to be printed. The material is easy to extend and difficult to overprint; too small tension, loose material, irregular movement, and inaccurate color register.
Further, in another embodiment, in the step S3, the film material is one of a photosensitive emulsion, a photosensitive film or a non-photosensitive film.
Further, in another embodiment, in the step S4, the solar cell printing pattern is transferred by preparing a solar cell pattern on a film, attaching the film to the first mesh 1, exposing, and developing after the exposure is finished; or directly gasifying the film material at the position of the printed pattern of the solar cell by laser.
The solar cell printing pattern transfer mode can be selected according to actual conditions, so that the invention is more convenient.
Further, in another embodiment, in the step S5, the selective removal of the gauze in the main grid pad 132 is performed by placing the stencil on the laser engraving device, identifying the gauze in the pad 132 according to a preset identification mark, and selectively removing the unnecessary gauze according to the requirement; or selectively etching away portions of the mesh based on the locations of the mesh within the pads 132 as measured by an AL inspection device or an image mapping device.
The method for removing the gauze can be selected according to actual conditions, so that the method is more convenient.
Further, in another embodiment, in the step S6, the removal degree of the gauze is that all the gauzes in a single direction in the pad 132 are removed; or the spacing removal of unidirectional gauze within the pad 132; or the gauze in two directions in the bonding pad 132 is removed at intervals; or partial removal of the two-directional screen within the pad 132.
The degree of removal of the gauze can be selected according to needs, and the feed amount of the silver paste is adjusted, so that the application range of the invention is wider.
According to the description and the drawings, the printing stencil for the solar cell and the manufacturing process thereof of the present invention can be easily manufactured or used by those skilled in the art, and can produce the positive effects described in the present invention.
Unless otherwise specified, in the present invention, if there is an orientation or positional relationship indicated by terms of "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, rather than to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore, the terms describing orientation or positional relationship in the present invention are for illustrative purposes only, and should not be construed as limiting the present patent, specific meanings of the above terms can be understood by those of ordinary skill in the art in light of the specific circumstances in conjunction with the accompanying drawings.
Unless expressly stated or limited otherwise, the terms "disposed," "connected," and "connected" are used broadly and encompass, for example, being fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.
Claims (9)
1. A printing stencil for a solar cell, comprising: the net comprises a first net cloth (1) and a second net cloth (2) which are arranged in sequence, wherein a net frame (3) is arranged on the periphery of the second net cloth;
the first mesh cloth (1) comprises a first mesh area (11) and a plurality of second mesh areas (12); the second grid areas (12) are uniformly distributed in the first mesh (1), and the number of the grid meshes of the second grid areas (12) is less than or equal to that of the first grid areas (11);
the first mesh cloth (1) is provided with a membrane material, a main grid (13) and an auxiliary grid (14) which are mutually crossed; the main grid (13) is formed by connecting fine lines (131) with pads (132) in series, and the second grid region (12) is located at the position of the pads (132).
2. The process of claim 1, wherein the stencil is used for solar cell fabrication, and wherein:
step S1: compounding the first mesh (1) and the second mesh (2);
step S2: stretching the compounded mesh cloth on a net stretching device to a certain tension, and bonding the stretched mesh cloth on a net frame with the tension of 0-50N/cm2；
Step S3: coating a membrane material on the first mesh cloth (1);
step S4: transferring a solar cell printing pattern to the first mesh cloth (1), and forming a stencil so that the gauze in the bonding pad (132) is vertically crossed or crossed at any angle;
step S5: the screen is selectively removed from the pads (132).
3. The process of claim 2, wherein the stencil is used for solar cell fabrication, and wherein: the first mesh cloth (1) and the second mesh cloth (2) are both one of polyester mesh cloth, nylon mesh cloth, stainless steel wire mesh cloth or electroforming mesh yarn.
4. The process of claim 2, wherein the stencil is used for solar cell fabrication, and wherein: the included angle between the first mesh cloth (1) and the horizontal position and the included angle between the second mesh cloth (2) and the horizontal position are both 0-180 degrees.
5. The process of claim 2, wherein the stencil is used for solar cell fabrication, and wherein: in the step S2, the tension is 10-30N/cm2。
6. The process of claim 2, wherein the stencil is used for solar cell fabrication, and wherein: in step S3, the film material is one of a photosensitive emulsion, a photosensitive film, or a non-photosensitive film.
7. The process of claim 2, wherein the stencil is used for solar cell fabrication, and wherein: in the step S4, the solar cell printing pattern transfer mode is that the solar cell pattern is prepared on a film, the film is attached to a first mesh (1), then exposure is carried out, and development is carried out after the exposure is finished; or directly gasifying the film material at the position of the printed pattern of the solar cell by laser.
8. The process of claim 2, wherein the stencil is used for solar cell fabrication, and wherein: in the step S5, the manner of selectively removing the gauze in the main grid pad (132) is to place the stencil on the laser engraving device, identify the gauze in the pad (132) according to a preset identification mark, and selectively remove the unnecessary gauze according to the requirement; or selectively etching away one of the portions of the mesh based on the mesh location within the pad (132) as measured by the AL inspection device or the image mapping device.
9. The process of claim 2, wherein the stencil is used for solar cell fabrication, and wherein: in the step S6, the removal degree of the gauze is the removal of all gauzes in a single direction in the pad (132); or the interval removal of the unidirectional gauze in the bonding pad (132); or the gauze in two directions in the bonding pad (132) is removed at intervals; or partial removal of the two-directional gauze in the pad (132).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011405331.5A CN112721417A (en) | 2020-12-03 | 2020-12-03 | Printing stencil for solar cell and manufacturing process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011405331.5A CN112721417A (en) | 2020-12-03 | 2020-12-03 | Printing stencil for solar cell and manufacturing process thereof |
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| Publication Number | Publication Date |
|---|---|
| CN112721417A true CN112721417A (en) | 2021-04-30 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011405331.5A Pending CN112721417A (en) | 2020-12-03 | 2020-12-03 | Printing stencil for solar cell and manufacturing process thereof |
Country Status (1)
| Country | Link |
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| CN (1) | CN112721417A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114701241A (en) * | 2022-03-10 | 2022-07-05 | 仓和精密制造(苏州)有限公司 | Preparation method of screen printing plate without net knots |
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| US20200279966A1 (en) * | 2017-09-07 | 2020-09-03 | Longi Solar Technology (Taizhou) Co., Ltd. | Solder strip applied to shingled solar cell module |
| CN111775550A (en) * | 2020-06-30 | 2020-10-16 | 晋能清洁能源科技股份公司 | 12BB multi-main grid mesh plate suitable for crystalline silicon battery |
| CN215397597U (en) * | 2020-12-03 | 2022-01-04 | 浙江硕克科技有限公司 | Printing stencil for solar cell |
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2020
- 2020-12-03 CN CN202011405331.5A patent/CN112721417A/en active Pending
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| CN103419474A (en) * | 2012-05-14 | 2013-12-04 | 昆山允升吉光电科技有限公司 | Silk screen of combined structure |
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| US20200279966A1 (en) * | 2017-09-07 | 2020-09-03 | Longi Solar Technology (Taizhou) Co., Ltd. | Solder strip applied to shingled solar cell module |
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| CN114701241A (en) * | 2022-03-10 | 2022-07-05 | 仓和精密制造(苏州)有限公司 | Preparation method of screen printing plate without net knots |
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