CN113771480A - Screen printing machine and solar cell printing method - Google Patents
Screen printing machine and solar cell printing method Download PDFInfo
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- CN113771480A CN113771480A CN202110982933.5A CN202110982933A CN113771480A CN 113771480 A CN113771480 A CN 113771480A CN 202110982933 A CN202110982933 A CN 202110982933A CN 113771480 A CN113771480 A CN 113771480A
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- scraper
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- screen
- screen printing
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- 238000007639 printing Methods 0.000 title claims abstract description 186
- 238000007650 screen-printing Methods 0.000 title claims abstract description 80
- 238000000034 method Methods 0.000 title claims abstract description 68
- 230000007246 mechanism Effects 0.000 claims abstract description 74
- 239000002390 adhesive tape Substances 0.000 claims description 20
- 238000006073 displacement reaction Methods 0.000 claims description 10
- 230000000903 blocking effect Effects 0.000 claims description 8
- 238000010276 construction Methods 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 45
- 238000004519 manufacturing process Methods 0.000 abstract description 12
- 238000004904 shortening Methods 0.000 abstract 1
- 239000000976 ink Substances 0.000 description 60
- 238000010586 diagram Methods 0.000 description 12
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 9
- 229910052710 silicon Inorganic materials 0.000 description 9
- 239000010703 silicon Substances 0.000 description 9
- 238000011084 recovery Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 241000409201 Luina Species 0.000 description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 229910052709 silver Inorganic materials 0.000 description 3
- 239000004332 silver Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F15/00—Screen printers
- B41F15/08—Machines
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F15/00—Screen printers
- B41F15/14—Details
- B41F15/16—Printing tables
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F15/00—Screen printers
- B41F15/14—Details
- B41F15/40—Inking units
- B41F15/42—Inking units comprising squeegees or doctors
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- 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
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- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/18—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
- H01L31/1804—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof comprising only elements of Group IV of the Periodic System
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- 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
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- 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
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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/547—Monocrystalline silicon PV cells
-
- 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
Abstract
The invention is suitable for the technical field of screen printing, and provides a screen printer and a solar cell printing method, wherein the screen printer comprises a printing table board, a screen printing plate arranged above the printing table board, a first scraper, a second scraper, a first driving mechanism for driving the first scraper to move up and down relative to the screen printing plate, a second driving mechanism for driving the second scraper to move up and down relative to the screen printing plate, and a third driving mechanism for driving the first scraper and the second scraper to horizontally reciprocate; the first scraper and the second scraper comprise scraper main bodies for printing, and baffle plates which are fixed on one sides of the scraper main bodies and used for returning ink. The screen printing machine provided by the invention realizes alternate printing by utilizing the first scraper and the second scraper, and can form effective printing in the ink returning process, thereby greatly shortening the time of the printing process, and improving the efficiency of the screen printing machine for printing the solar cell, thereby improving the production efficiency of the solar cell.
Description
Technical Field
The invention relates to the technical field of screen printing, in particular to a screen printing machine and a solar cell printing method.
Background
In the solar screen printing process, a screen printer is generally used to screen-print the conductive paste onto the silicon wafer. When the solar cell is printed, firstly, the conductive paste is added on the screen printing plate, a certain pressure is applied to the screen printing plate through the scraper, meanwhile, the scraper moves towards the other end of the screen printing plate, and the conductive paste is extruded onto the silicon chip from the meshes of the screen printing plate in the moving process of the scraper. The paste adheres to the silicon chip to form a silver back electrode, an aluminum back field or a silver positive electrode under the action of viscosity, the scraper scrapes the whole page and lifts up, and then the conductive paste is slightly scraped back to the initial position by the ink returning knife, so that an effective printing process is completed.
Among the prior art, traditional screen printing machine sets up a scraper and a return ink sword usually, after the whole space of a whole page is scraped to the scraper, need lightly scrape back initial position with conductive paste through returning the ink sword, and return the ink sword at the black in-process of returning, the scraper can't print, therefore return black process and can not form effective printing, the time of returning black process is ineffective printing time, can increase the time of printing process like this, lead to screen printing machine printing solar cell's inefficiency, thereby make solar cell's production efficiency low.
Disclosure of Invention
The invention provides a screen printer, and aims to solve the problems that effective printing cannot be formed in the ink returning process of the screen printer in the prior art, and the production efficiency of a solar cell is low due to low efficiency of the screen printer in printing the solar cell.
The invention is realized in such a way, and provides a screen printer of a solar cell, which comprises a printing table board, a screen printing plate arranged above the printing table board, a first scraper and a second scraper which are arranged above the screen printing plate and are adjacently arranged at intervals, a first driving mechanism for driving the first scraper to move up and down relative to the screen printing plate, a second driving mechanism for driving the second scraper to move up and down relative to the screen printing plate, and a third driving mechanism for driving the first scraper and the second scraper to horizontally reciprocate;
the first scraper and the second scraper both comprise scraper main bodies used for printing and baffle plates fixed on one sides of the scraper main bodies and used for returning ink, the printing direction of the first scraper is opposite to the ink returning direction of the second scraper, and the printing direction of the second scraper is opposite to the ink returning direction of the first scraper.
Preferably, the baffle of the first scraper is arranged on one side of the scraper main body far away from the second scraper, and the baffle of the second scraper is arranged on one side of the scraper main body far away from the first scraper.
Preferably, the first scraper and the second scraper have the same structure, and the arrangement directions of the first scraper and the second scraper are opposite.
Preferably, the included angle between the baffle of the first scraper and the baffle of the second scraper and the printing table surface is-10-20 degrees, and the setting direction of the baffle of the first scraper is opposite to that of the baffle of the second scraper.
Preferably, the scraper main body comprises a support and a printing adhesive tape fixed on the support, and the baffle is fixed on the support; the printing adhesive tape of the first scraper is opposite to the printing adhesive tape of the second scraper in arrangement direction.
Preferably, the included angle between the printing adhesive tape of the first scraper and the printing table top of the second scraper and the printing table top is 45-70 degrees.
The invention also provides a solar cell printing method applied to the screen printer, which comprises the following steps:
controlling the first driving mechanism to drive the first scraper to descend to a first set distance lower than the screen printing plate so as to enable the first scraper to form a printing preparation state; controlling the second driving mechanism to drive the second scraper to descend to a second set distance higher than the screen printing plate so as to enable the second scraper to form a state of preparing ink return;
controlling the third driving mechanism to drive the first scraper and the second scraper to synchronously move along the first direction, so that the first scraper prints on the screen printing plate along the first direction at a preset printing speed, and the second scraper returns ink on the screen printing plate;
controlling the first driving mechanism and the second driving mechanism to respectively drive the first scraper and the second scraper to rise to a third set distance higher than the screen printing plate;
controlling the third driving mechanism to drive the first scraper and the second scraper to continuously move towards the first direction for a preset displacement;
controlling the first driving mechanism to drive the first scraper to descend to be lower than the second set distance of the screen printing plate so as to enable the first scraper to form a state of preparing ink return; controlling the second driving mechanism to drive the second scraper to descend to be lower than the first set distance of the screen printing plate so as to enable the second scraper to form a printing preparation state;
controlling the third driving mechanism to drive the first scraper and the second scraper to move along a second direction opposite to the first direction, so that the second scraper prints on the screen printing plate along the second direction at a preset printing speed, and the first scraper returns ink on the screen printing plate;
controlling the first driving mechanism and the second driving mechanism to respectively drive the first scraper and the second scraper to rise to a third set distance higher than the screen printing plate;
and controlling the third driving mechanism to drive the first scraper and the second scraper to continuously move towards the second direction for preset displacement, and finishing one-time alternate printing of the first scraper and the second scraper.
Preferably, the first set distance is 1.0-2.5 mm; the second set distance is 2.0-5.0 mm; the third set distance is 50-100 mm.
Preferably, the predetermined displacement is 20-50 mm.
Preferably, the preset printing speed is 200-400 mm/s.
According to the screen printer, the first scraper and the second scraper are arranged, the first scraper and the second scraper respectively comprise the scraper main body for printing and the baffle fixed on one side of the scraper main body and used for returning ink, alternate printing can be achieved by utilizing the first scraper and the second scraper, and one scraper is always used for effectively printing in the ink returning process of the first scraper or the second scraper, so that the screen printer can still form effective printing in the ink returning process, the time in the ink returning process can be converted into the effective printing time, the printing efficiency of the screen printer is improved, when the screen printer is used for printing a solar cell, the time of a cell printing process can be greatly shortened, the printing efficiency of the solar cell is improved, and the production efficiency of the solar cell is improved. The printing method of the solar cell is applied to the screen printing machine, and effective printing can be formed by controlling the first scraper and the second scraper to alternately print in the reciprocating motion process in the printing process, so that the time of the printing process is greatly shortened, the printing efficiency of the solar cell is improved, and the production efficiency of the solar cell is improved.
Drawings
Fig. 1 is a schematic structural diagram of a screen printing machine according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a first scraper and a second scraper of a screen printing machine according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a screen printing machine in a first doctor printing state according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a screen printing machine in a second doctor printing state according to an embodiment of the present invention;
fig. 5 is a schematic state diagram of the first doctor blade and the second doctor blade after step S1 of the solar cell printing method according to the embodiment of the present invention is implemented;
fig. 6 is a schematic state diagram of the first doctor blade and the second doctor blade after step S2 of the solar cell printing method according to the embodiment of the present invention is implemented;
fig. 7 is a schematic state diagram of the first doctor blade and the second doctor blade after step S3 of the solar cell printing method according to the embodiment of the present invention is implemented;
fig. 8 is a schematic state diagram of the first doctor blade and the second doctor blade after step S4 of the solar cell printing method according to the embodiment of the present invention is implemented;
fig. 9 is a schematic state diagram of the first doctor blade and the second doctor blade after step S5 of the solar cell printing method according to the embodiment of the present invention is implemented;
fig. 10 is a schematic state diagram of the first doctor blade and the second doctor blade after step S6 of the solar cell printing method according to the embodiment of the present invention is implemented;
fig. 11 is a schematic state diagram of the first doctor blade and the second doctor blade after step S7 of the solar cell printing method according to the embodiment of the present invention is implemented;
fig. 12 is a schematic state diagram of the first doctor blade and the second doctor blade after step S8 of the solar cell printing method according to the embodiment of the present invention is implemented.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
According to the screen printing machine provided by the embodiment of the invention, the first scraper and the second scraper are arranged, the first scraper and the second scraper respectively comprise the scraper main body for printing and the baffle fixed on one side of the scraper main body and used for returning ink, alternate printing can be realized by utilizing the first scraper and the second scraper, and one scraper is always used for effectively printing in the ink returning process of the first scraper or the second scraper, so that the screen printing machine can still form effective printing in the ink returning process, the time of the ink returning process can be converted into the effective printing time, the printing efficiency of the screen printing machine is improved, and when the screen printing machine is applied to printing a solar cell, the time of a cell printing process can be greatly shortened, so that the production efficiency of the solar cell is improved.
Referring to fig. 1 to 4, an embodiment of the present invention provides a screen printing machine, which includes a printing table 1, a screen 2 disposed above the printing table 1, a first scraper 3 and a second scraper 4 disposed above the screen 2 and adjacently spaced from each other, a first driving mechanism 5 for driving the first scraper 3 to move up and down relative to the screen 2, a second driving mechanism 6 for driving the second scraper 4 to move up and down relative to the screen 2, and a third driving mechanism (not shown) for driving the first scraper 3 and the second scraper 4 to horizontally reciprocate;
the first scraper 3 and the second scraper 4 both include a scraper main body 30 for printing and a baffle 31 fixed on one side of the scraper main body 30 for ink return, and the printing direction of the first scraper 3 is opposite to the ink return direction of the second scraper 4, and the printing direction of the second scraper 4 is opposite to the ink return direction of the first scraper 3.
In the embodiment of the present invention, the printing table 1 is used for carrying a printing object 100. When the screen printing machine is used for printing a solar cell, the printing stock 100 is a silicon wafer, and the screen printing machine applies a certain pressure to the screen 2 by using the first scraper 3 or the second scraper 4 so as to extrude the conductive paste pre-filled on the screen 2 onto the silicon wafer below the screen 2 from the meshes of the screen 2, thereby realizing the printing of a silver back electrode, an aluminum back field or a silver positive electrode of the solar cell.
According to one embodiment of the invention, a support frame 8 is arranged above the printing table top 1, a sliding seat 9 is movably arranged on the support frame 8, the sliding seat 9 can slide back and forth along the support frame 8 in the horizontal direction, a first scraper 3 and a second scraper 4 are arranged on the sliding seat 9, a first driving mechanism 5 is arranged on the sliding seat 9 and connected with the first scraper 3, a second driving mechanism 6 is arranged on the sliding seat 9 and connected with the second scraper 4, and a third driving mechanism is connected with the sliding seat 9. The first driving mechanism 5 can drive the first scraper 3 to move up and down relative to the screen 2, the second driving mechanism 6 can drive the second scraper 4 to move up and down relative to the screen 2, and the third driving mechanism can drive the sliding seat 9 to drive the first scraper 3, the second scraper 4, the first driving mechanism 5 and the second driving mechanism 6 to synchronously move horizontally relative to the screen 2, so that the first scraper 3 and the second scraper 4 synchronously move horizontally relative to the screen 2.
Specifically, the first driving mechanism 5, the second driving mechanism 6, and the third driving mechanism may be a telescopic motor, an air cylinder, or a hydraulic cylinder, and the specific form of the first driving mechanism 5, the second driving mechanism 6, and the third driving mechanism is not limited.
In the embodiment of the present invention, the first driving mechanism 5, the second driving mechanism 6, and the third driving mechanism are respectively connected to a control device (not shown), and the control device controls the first driving mechanism 5, the second driving mechanism 6, and the third driving mechanism to work cooperatively, so as to drive the first scraper 3 and the second scraper 4 to move up and down relative to the screen 2 and move horizontally relative to the screen 2, thereby implementing the printing operation of the screen printing machine.
In the embodiment of the invention, the screen printing machine is provided with the first scraper 3 and the second scraper 4, the ink returning blade of the traditional screen printing machine is replaced by the second scraper 4, and the first scraper 3 and the second scraper 4 are respectively provided with the baffle 31, so that the first scraper 3 and the second scraper 4 can realize the printing function and the ink returning function without arranging a special ink returning blade, the screen printing machine can utilize the first scraper 3 and the second scraper 4 to alternately print in the printing process, and one of the first scraper 3 and the second scraper 4 carries out the ink returning when printing, so that one of the first scraper 3 and the second scraper 4 carries out the effective printing in the ink returning process, the screen printing machine can still form the effective printing in the ink returning process, and the time of the ink returning process can be converted into the effective printing time, the printing efficiency of the screen printing machine is improved, and when the screen printing machine is applied to printing the solar cell, the time of a cell printing process can be greatly shortened, so that the production efficiency of the solar cell is high.
In one embodiment of the present invention, the first scraper 3 and the second scraper 4 have the same structure, and the first scraper 3 and the second scraper 4 are arranged in opposite directions. Through setting the structure of first scraper 3 and second scraper 4 to be identical, be convenient for the production and processing of first scraper 3 and second scraper 4, and be convenient for the maintenance of first scraper 3 and second scraper 4 to change. When the first blade 3 and the second blade 4 are mounted, the first blade 3 and the second blade 4 only need to be mounted in different directions, so that the first blade 3 and the second blade 4 can effectively print in opposite directions.
Wherein the printing direction of the first blade 3 is in a first direction, i.e. in a left-to-right direction in fig. 1; the ink return direction of the first blade 3 is in a second direction opposite to the first direction, i.e., in the right-to-left direction in fig. 1; the printing direction of the second blade 4 is in a second direction, i.e., in a right-to-left direction in fig. 1; the ink return direction of the second blade 4 is in the first direction, i.e., in the left-to-right direction in fig. 1. When the first scraper 3 and the second scraper 4 move along the first direction, the first scraper 3 performs effective printing, and the second scraper 4 performs ink return; when the first blade 3 and the second blade 4 move in the second direction, the second blade 4 performs effective printing, and the first blade 3 performs ink recovery.
As an embodiment of the invention, the guard 31 of the first blade 3 is arranged on the side of the blade body 30 remote from the second blade 4, and the guard 31 of the second blade 4 is arranged on the side of the blade body 30 remote from the first blade 3.
In this embodiment, when the first scraper 3 and the second scraper 4 move in the printing stroke along the first direction, the first scraper 3 prints along the first direction, and the baffle 31 of the second scraper 4 forms an ink return state for the conductive paste on the screen 2; when the first scraper 3 and the second scraper 4 move along the second direction in the printing stroke, the second scraper 4 prints along the second direction opposite to the first direction, and the baffle 31 of the first scraper 3 forms an ink return state for the conductive paste on the screen 2, so that the first scraper 3 and the second scraper 4 can form effective printing when reciprocating in the printing stroke, the printing process time is greatly shortened, and the printing efficiency is improved.
Referring to fig. 3 and 4, as an embodiment of the present invention, an included angle θ 1 between the blocking plate 31 of the first scraper 3 and the second scraper 4 and the printing table top 1 is-10 to 20 °, and the setting directions of the blocking plate 31 of the first scraper 3 and the blocking plate 31 of the second scraper 4 are opposite.
In this embodiment, the baffle 31 of the first scraper 3 and the second scraper 4 is a plate-shaped structure. Preferably, the material of the baffle 31 is stainless steel. The conductive paste mass is pressed down by the shutter 31, so that the ink return function can be realized. Wherein, the setting direction of the baffle 31 of the first scraper 3 is opposite to that of the baffle 31 of the second scraper 4, so that the baffle 31 of the first scraper 3 and the baffle 31 of the second scraper 4 realize ink return in opposite directions.
As a preferred embodiment of the present invention, the angle θ 1 between the baffle 31 of the first doctor blade 3 and the second doctor blade 4 and the printing table top 1 is 10 °, so that the baffle 31 of the first doctor blade 3 and the second doctor blade 4 has a good ink return effect.
As an embodiment of the present invention, the scraper main body 30 includes a bracket 301, and a printing adhesive tape 302 fixed on the bracket, the baffle 31 is fixed on the bracket, and the printing adhesive tape 302 of the first scraper 3 and the printing adhesive tape 302 of the second scraper 4 are arranged in opposite directions.
In this embodiment, when the first scraper 3 and the second scraper 4 are used for printing, the screen printing machine applies a certain pressure to the screen 2 by using the printing adhesive tape 302 of the first scraper 3 or the second scraper 4, so as to extrude the conductive paste pre-filled on the screen 2 onto the silicon wafer below the screen 2 from the meshes of the screen 2, thereby realizing the printing of the silver back electrode, the aluminum back field, or the silver positive electrode of the solar cell. Because the printing adhesive tape 302 of the first scraper 3 is opposite to the printing adhesive tape 302 of the second scraper 4, the first scraper 3 and the second scraper 4 can effectively print in opposite directions, and the first scraper 3 and the second scraper 4 can print alternately in different directions.
In an embodiment of the present invention, the doctor blade body 30 further includes a clamp 303 disposed on the support 30, and the printing adhesive tape 302 is clamped and fixed to the clamp 303. The printing adhesive tape 302 is fixed on the clamp 303 in a clamping and fixing manner, so that the printing adhesive tape 302 and the bracket 30 are conveniently and fixedly mounted, and the printing adhesive tape 302 is conveniently replaced.
As an embodiment of the present invention, an included angle θ 2 between the printing adhesive tape 302 of the first scraper 3 and the second scraper 4 and the printing table 1 is 45 to 70 °, so as to ensure that the first scraper 3 and the second scraper 4 have a good printing effect.
As a preferred embodiment of the present invention, the angle θ 2 between the printing strip 302 and the printing table 1 is 55 °.
The screen printing machine that this embodiment provided is through setting up first scraper and second scraper, first scraper and second scraper all are including the scraper main part that is used for the printing, and be fixed in scraper main part one side and be used for returning black baffle, utilize first scraper and second scraper to realize alternate printing, and first scraper or second scraper have a scraper to carry out effective printing all the time at the ink in-process of returning, ensure that this screen printing machine still can form effective printing at the ink process of returning, therefore can be with the time of returning the ink process for converting to effective printing time, screen printing machine's printing efficiency has been promoted, this screen printing machine is when printing solar cell, the time of battery printing process can be shortened greatly, thereby make solar cell's production efficiency high.
Referring to fig. 5 to 12, an embodiment of the invention further provides a solar cell printing method applied to the screen printer of the above embodiment, including the following steps:
step S1, controlling the first driving mechanism 5 to drive the first scraper 3 to descend to a first set distance below the screen 2, so that the first scraper 3 is ready to be printed; the second scraper 4 is driven by the second driving mechanism 6 to descend to a second set distance higher than the screen 2, so that the second scraper 4 is in a state of preparing ink return;
specifically, before printing, the screen printing machine fills the conductive paste in the screen 2 in advance, so that when the first scraper 3 or the second scraper 4 prints, the conductive paste is extruded onto the silicon wafer below the screen 2 from the meshes of the screen 2 by the first scraper 3 or the second scraper 4, thereby realizing printing of the solar cell.
As shown in fig. 5, in this step, the first driving mechanism 5 is controlled to drive the first scraper 3 to descend to a first set distance below the screen 2, so that the printing adhesive tape 302 of the first scraper 3 applies a certain pressure to the screen 2, so that the conductive paste is extruded onto the silicon wafer below the screen 2 from the mesh of the screen 2 during the subsequent printing by the first scraper 3, thereby realizing the printing by the first scraper 3. The second driving mechanism 6 is controlled to drive the second scraper 4 to descend to a second set distance higher than the screen 2, so that the baffle 31 of the second scraper 4 is in an ink return state, and ink return is performed in the printing process of the first scraper 3.
As an embodiment of the present invention, the first set distance is 1.0 to 2.5 mm; the second set distance is 2.0-5.0mm, ensuring good printing effect of the first blade 3 and good ink return effect of the second blade 4. In addition, the first set distance and the second set distance can be set according to actual needs.
Step S2, controlling the third driving mechanism to drive the first scraper 3 and the second scraper 4 to move synchronously along the first direction, so that the first scraper 3 prints on the screen 2 at a preset printing speed along the first direction, and the second scraper 4 performs ink recovery on the screen 2;
as shown in fig. 6, the first direction is a left-to-right direction, and the first scraper 3 and the second scraper 4 are sequentially arranged at intervals from left to right. The first scraper 3 moves from the leftmost side of the screen printing plate 2 to the rightmost side of the screen printing plate 2 along the first direction, and the first scraper 3 scrapes the whole page to finish an effective printing process. When the first blade 3 and the second blade 4 move in the first direction, one of the blades performs effective printing, and the other blade performs ink recovery.
As an embodiment of the invention, the preset printing speed is 200-400 mm/s, so that the effective time of a printing process can be greatly shortened, and the production efficiency is improved. Taking 210 x 210mm solar cells as an example, the effective printing time is about 0.65-1.20 s/sheet.
Step S3, controlling the first driving mechanism 5 and the second driving mechanism 6 to respectively drive the first scraper 3 and the second scraper 4 to rise to a third set distance above the screen 2;
as shown in fig. 7, in this step, the first doctor blade 3 and the second doctor blade 4 are moved rightward across the conductive paste mass on the screen 2 by raising the first doctor blade 3 and the second doctor blade 4 to a third set distance above the screen 2.
As an embodiment of the invention, the third set distance is 50-100mm, which ensures that the gap between the first and second doctor blades 3, 4 and the screen 2 is larger than the conductive paste mass, and ensures that the subsequent first and second doctor blades 3, 4 can smoothly pass over the conductive paste mass on the screen 2.
Step S4, controlling a third driving mechanism to drive the first scraper 3 and the second scraper 4 to move continuously to the first direction for a preset displacement;
as shown in fig. 8, wherein the preset displacement may be set according to the actual situation. As an embodiment of the invention, the predetermined displacement is 20-50mm, which ensures that the subsequent first and second doctor blades 3, 4 are able to completely pass over the conductive paste mass on the screen 2.
Step S5, controlling the first driving mechanism 5 to drive the first scraper 3 to descend to a second set distance lower than the screen 2, so that the first scraper 3 is ready to return ink; the second scraper 4 is driven by the second driving mechanism 6 to descend to be lower than the screen 2 by a first set distance, so that the second scraper 4 is in a ready-to-print state;
as shown in fig. 9, specifically, the first driving mechanism 5 drives the first scraper 3 to descend to a second set distance higher than the screen 2, so that the blocking plate 31 of the first scraper 3 is in a state ready for ink recovery, so that the first scraper 3 performs ink recovery during the printing process of the second scraper 4. The second driving mechanism 6 drives the second scraper 4 to descend to a first set distance lower than the screen 2, so that the printing adhesive tape 302 of the second scraper 4 applies a certain pressure to the screen 2, so that the second scraper 4 extrudes the conductive paste onto the silicon wafer below the screen 2 from the mesh of the screen 2, and the printing of the second scraper 4 is realized.
As an embodiment of the present invention, the first set distance is 1.0 to 2.5 mm; the second set distance is 2.0-5.0 mm.
Step S6, controlling the third driving mechanism to drive the first scraper 3 and the second scraper 4 to move along a second direction opposite to the first direction, so that the second scraper 4 prints on the screen 2 along the second direction at a preset printing speed, and the first scraper 3 performs ink returning on the screen 2;
as shown in fig. 10, the second direction is a direction from right to left. The preset printing speed is 200-400 mm/s, namely the printing speed of the second scraper 4 is the same as that of the second scraper 4. The second scraper 4 moves from the rightmost side of the screen printing plate 2 to the leftmost side of the screen printing plate 2 along the second direction, and the second scraper 4 scrapes the whole page to finish an effective printing process, so that the second scraper 4 and the first scraper 3 are printed alternately. When the second squeegee 4 prints in the second direction, the first squeegee 3 returns ink on the screen 2, and when the first squeegee 3 and the second squeegee 4 are moved in the second direction, one of the squeegees prints effectively and the other squeegee returns ink.
Step S7, controlling the first driving mechanism 5 and the second driving mechanism 6 to respectively drive the first scraper 3 and the second scraper 4 to rise to a third set distance above the screen 2;
as shown in fig. 11, in this step, after the second doctor blade 4 completes the printing operation to the left, the first and second doctor blades 3 and 4 are raised by controlling the first and second driving mechanisms 5 and 6 so as to ensure that the subsequent first and second doctor blades 3 and 4 can smoothly pass over the conductive paste mass on the screen 2 to the left. Wherein the third set distance is 50-100 mm.
And step S8, controlling the third driving mechanism to drive the first scraper 3 and the second scraper 4 to move continuously in the second direction for a preset displacement, so as to complete one-time alternate printing of the first scraper 3 and the second scraper 4.
As shown in fig. 12, in this step, the first blade 3 and the second blade 4 are continuously moved leftward to pass over the pulp mass by controlling the third driving mechanism, and the process returns to step S1 to perform the next printing operation.
Wherein, the whole printing process of above-mentioned step S1-S8 circulation formation solar cell printing process, constantly carry out alternate printing through first scraper 3 and second scraper 4 like this, ensure that first scraper 3 and the reciprocal printing in-process of second scraper 4 have a scraper to print all the time, another scraper returns the china ink, and first scraper 3 and the reciprocal motion process of second scraper 4 can both form effectual printing, make and return the china ink process and still can form effective printing, the time of returning the china ink process is for converting into effective printing time, the time of battery printing process has been shortened greatly like this, thereby solar cell' S production efficiency has been promoted greatly.
The solar cell printing method provided by the embodiment of the invention is applied to the screen printer, and by controlling the first scraper and the second scraper to print alternately, one scraper is always used for printing while the other scraper is used for returning ink in the reciprocating motion of the first scraper and the second scraper in the printing process, the screen printer can still form effective printing in the ink returning process, the time of the ink returning process is converted into effective printing time, and the time of a cell printing process is greatly shortened, so that the printing efficiency of the solar cell is greatly improved, and the production efficiency of the solar cell is further improved.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A screen printing machine is characterized by comprising a printing table board, a screen printing plate arranged above the printing table board, a first scraper and a second scraper which are arranged above the screen printing plate and are arranged adjacently at intervals, a first driving mechanism used for driving the first scraper to move up and down relative to the screen printing plate, a second driving mechanism used for driving the second scraper to move up and down relative to the screen printing plate, and a third driving mechanism used for driving the first scraper and the second scraper to horizontally reciprocate;
the first scraper and the second scraper both comprise scraper main bodies used for printing and baffle plates fixed on one sides of the scraper main bodies and used for returning ink, the printing direction of the first scraper is opposite to the ink returning direction of the second scraper, and the printing direction of the second scraper is opposite to the ink returning direction of the first scraper.
2. The screen printing machine of claim 1, wherein the guard of the first doctor blade is provided on a side of the doctor body remote from the second doctor blade, and the guard of the second doctor blade is provided on a side of the doctor body remote from the first doctor blade.
3. The screen printing machine of claim 1, wherein the first doctor blade and the second doctor blade are identical in construction and are disposed in opposite directions.
4. The screen printing machine according to claim 1, wherein the angle between the blocking plate of the first scraper and the blocking plate of the second scraper and the printing table is-10 to 20 °, and the blocking plate of the first scraper and the blocking plate of the second scraper are arranged in opposite directions.
5. The screen printing machine according to claim 1, wherein the squeegee body includes a bracket, a printing adhesive tape fixed to the bracket, and the baffle is fixed to the bracket; the printing adhesive tape of the first scraper is opposite to the printing adhesive tape of the second scraper in arrangement direction.
6. The screen printing machine according to claim 1, wherein the printing rubber strips of the first scraper and the second scraper form an angle of 45-70 ° with the printing table.
7. A solar cell printing method applied to the screen printer according to any one of claims 1 to 6, comprising the steps of:
controlling the first driving mechanism to drive the first scraper to descend to a first set distance lower than the screen printing plate so as to enable the first scraper to form a printing preparation state; controlling the second driving mechanism to drive the second scraper to descend to a second set distance higher than the screen printing plate so as to enable the second scraper to form a state of preparing ink return;
controlling the third driving mechanism to drive the first scraper and the second scraper to synchronously move along the first direction, so that the first scraper prints on the screen printing plate along the first direction at a preset printing speed, and the second scraper returns ink on the screen printing plate;
controlling the first driving mechanism and the second driving mechanism to respectively drive the first scraper and the second scraper to rise to a third set distance higher than the screen printing plate;
controlling the third driving mechanism to drive the first scraper and the second scraper to continuously move towards the first direction for a preset displacement;
controlling the first driving mechanism to drive the first scraper to descend to be lower than the second set distance of the screen printing plate so as to enable the first scraper to form a state of preparing ink return; controlling the second driving mechanism to drive the second scraper to descend to be lower than the first set distance of the screen printing plate so as to enable the second scraper to form a printing preparation state;
controlling the third driving mechanism to drive the first scraper and the second scraper to move along a second direction opposite to the first direction, so that the second scraper prints on the screen printing plate along the second direction at a preset printing speed, and the first scraper returns ink on the screen printing plate;
controlling the first driving mechanism and the second driving mechanism to respectively drive the first scraper and the second scraper to rise to a third set distance higher than the screen printing plate;
and controlling the third driving mechanism to drive the first scraper and the second scraper to continuously move towards the second direction for preset displacement, and finishing one-time alternate printing of the first scraper and the second scraper.
8. The solar cell printing method according to claim 7, wherein the first set distance is 1.0-2.5 mm; the second set distance is 2.0-5.0 mm; the third set distance is 50-100 mm.
9. The solar cell printing method of claim 7, wherein the predetermined displacement is 20-50 mm.
10. The method of claim 7, wherein the predetermined printing speed is 200-400 mm/s.
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| CN202110982933.5A CN113771480A (en) | 2021-08-25 | 2021-08-25 | Screen printing machine and solar cell printing method |
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Application publication date: 20211210 |
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