CN115384178B - Screen printing equipment for capacitor and preparation method of capacitor - Google Patents
Screen printing equipment for capacitor and preparation method of capacitor Download PDFInfo
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- CN115384178B CN115384178B CN202211218834.0A CN202211218834A CN115384178B CN 115384178 B CN115384178 B CN 115384178B CN 202211218834 A CN202211218834 A CN 202211218834A CN 115384178 B CN115384178 B CN 115384178B
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- 239000003990 capacitor Substances 0.000 title claims abstract description 48
- 238000007650 screen-printing Methods 0.000 title claims abstract description 33
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- 238000005520 cutting process Methods 0.000 claims abstract description 150
- 238000007639 printing Methods 0.000 claims abstract description 43
- 239000000919 ceramic Substances 0.000 claims abstract description 33
- 238000004519 manufacturing process Methods 0.000 claims abstract description 17
- 239000010408 film Substances 0.000 claims description 22
- 230000000149 penetrating effect Effects 0.000 claims description 11
- 239000002002 slurry Substances 0.000 claims description 10
- 238000010030 laminating Methods 0.000 claims description 8
- 238000011049 filling Methods 0.000 claims description 6
- 239000002003 electrode paste Substances 0.000 claims description 4
- 238000005245 sintering Methods 0.000 claims description 4
- 238000000462 isostatic pressing Methods 0.000 claims description 3
- 239000010409 thin film Substances 0.000 claims description 2
- 230000035515 penetration Effects 0.000 claims 1
- 238000003475 lamination Methods 0.000 abstract description 11
- 238000012797 qualification Methods 0.000 abstract description 7
- 239000000047 product Substances 0.000 description 31
- 230000000052 comparative effect Effects 0.000 description 22
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 10
- 238000005259 measurement Methods 0.000 description 5
- 229910052759 nickel Inorganic materials 0.000 description 5
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 239000003985 ceramic capacitor Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000012046 mixed solvent Substances 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 239000004014 plasticizer Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- MQIUGAXCHLFZKX-UHFFFAOYSA-N Di-n-octyl phthalate Natural products CCCCCCCCOC(=O)C1=CC=CC=C1C(=O)OCCCCCCCC MQIUGAXCHLFZKX-UHFFFAOYSA-N 0.000 description 1
- 241000282326 Felis catus Species 0.000 description 1
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 description 1
- 229910002113 barium titanate Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- BJQHLKABXJIVAM-UHFFFAOYSA-N bis(2-ethylhexyl) phthalate Chemical group CCCCC(CC)COC(=O)C1=CC=CC=C1C(=O)OCC(CC)CCCC BJQHLKABXJIVAM-UHFFFAOYSA-N 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011267 electrode slurry Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
- B41F15/0804—Machines for printing sheets
- B41F15/0813—Machines for printing sheets with flat screens
-
- 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
- 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
- B41M1/34—Printing on other surfaces than ordinary paper on glass or ceramic surfaces
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G13/00—Apparatus specially adapted for manufacturing capacitors; Processes specially adapted for manufacturing capacitors not provided for in groups H01G4/00 - H01G11/00
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/005—Electrodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/30—Stacked capacitors
-
- 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
- B41P2215/12—Screens
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/018—Dielectrics
- H01G4/06—Solid dielectrics
- H01G4/08—Inorganic dielectrics
- H01G4/12—Ceramic dielectrics
Abstract
The invention relates to screen printing equipment of a capacitor and a preparation method of the capacitor, and belongs to the technical field of component manufacturing. The screen printing equipment of the capacitor comprises a printing screen, wherein screen patterns of the printing screen comprise a product area, a cutting line area and a fixing area, a plurality of product patterns are arranged in the product area, a plurality of first cutting line patterns and a plurality of second cutting line patterns are arranged in the cutting line area, and a plurality of fixing block patterns are arranged in the fixing area; a plurality of first blank areas are arranged in the first cutting line graph, and the first blank areas are uniformly distributed along the Y-axis direction of the first cutting line graph. The screen printing equipment provided by the invention prints on the ceramic film, and the formed first cutting lines have good dimensional consistency, and the first cutting lines have good thickness consistency with the inner electrodes, so that the first cutting lines are not easy to deform during lamination and lamination, and the qualification rate of products is ensured.
Description
Technical Field
The invention belongs to the technical field of component manufacturing, and relates to screen printing equipment of a capacitor and a preparation method of the capacitor.
Background
Multilayer ceramic capacitors are one of the chip components that are currently used in the world with the greatest amount and the fastest growing speed. The surface-mounted multilayer ceramic capacitor element manufactured by the mutual alternation of dielectrics and electrodes is applied to digital products such as televisions, mobile phones, computers, medical appliances, video recorders and the like, and is widely applied to coupling, filtering, oscillating and bypass circuits in the electronic complete machine of industrial automation control equipment.
At present, a multilayer ceramic capacitor is mainly prepared by casting ceramic slurry into a dielectric layer, printing an inner electrode on the dielectric layer through printing equipment, and laminating, pressing and sintering the dielectric layer printed with the inner electrode. The screen pattern of the existing printing screen is shown in fig. 1, and comprises a cutting line pattern distributed along the X-axis direction, a cutting line pattern distributed along the Y-axis direction, and a product pattern, wherein the product pattern is used for forming an internal electrode by penetrating paste during printing, and the cutting line pattern is used for forming a cutting line by penetrating paste during printing, so that the following problems exist in practical application of the printing screen: after electrode paste printing is performed on the ceramic film, the thickness consistency of the cutting line is poor, the printing thickness of the cutting line is thicker than that of the inner electrode, and the cutting line is easier to deform due to the fact that the thickness of the cutting line is inconsistent during subsequent lamination, so that the problem that internal products of a laminated body are cut to be wasted in a subsequent cutting process is caused.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide screen printing equipment for a capacitor and a preparation method for the capacitor.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
in a first aspect, the screen printing device for a capacitor provided by the invention comprises a printing screen, wherein the screen pattern of the printing screen comprises a product area, a cutting line area and a fixing area, the cutting line area and the fixing area are arranged around the product area, a plurality of product patterns are arranged in the product area, a plurality of first cutting line patterns and a plurality of second cutting line patterns are arranged in the cutting line area, a plurality of fixing block patterns are arranged in the fixing area, and the product patterns, the first cutting line patterns, the second cutting line patterns and the fixing block patterns are arranged and combined into the screen pattern according to a preset rule; a plurality of first blank areas are arranged in the first cutting line graph, and the first blank areas are uniformly distributed along the Y-axis direction of the first cutting line graph.
In the invention, a plurality of product patterns are uniformly distributed in the product area according to a preset rule, the product patterns are used for penetrating pulp, and corresponding internal electrodes are formed on the ceramic film; the fixed block graph is used for penetrating pulp, plays a role in fixing printing sheets during lamination, a laminating machine firstly cuts the fixed printing sheets to obtain single-sheet printing sheets, and the single-sheet printing sheets are stacked in a staggered manner for multiple times along the X-axis direction of the silk screen graph according to the length R to obtain a laminated body; the area of the first cutting line pattern, from which the first blank area is removed, is a filling area, the filling area of the first cutting line pattern is used for penetrating pulp, and a first cutting line corresponding to the first cutting line pattern is formed on the ceramic film; the second cutting line pattern is used for penetrating pulp, and a second cutting line corresponding to the second cutting line pattern is formed on the ceramic film; the first cutting line patterns and the second cutting line patterns are used for cutting the laminated body to obtain a green body, the first cutting line patterns are uniformly distributed along the X-axis direction of the silk screen patterns, the second cutting line patterns are uniformly distributed along the Y-axis direction of the silk screen patterns, a second blank area is reserved between two adjacent first cutting line patterns, the second blank area is used for cutting alignment, a third blank area is arranged between two adjacent second cutting line patterns, and the third blank area is also used for cutting alignment.
According to the invention, the first blank areas are arranged in the first cutting line pattern, electrode paste printing is performed on the ceramic film through the screen printing equipment designed by the specific pattern, the formed first cutting line has good size consistency, the first cutting line has good thickness consistency with the inner electrode, the first cutting line is not easy to deform when laminated and pressed, the position deviation of the inner electrode adjacent to the first cutting line during lamination is reduced, and the qualification rate of products is further ensured.
As a preferred embodiment of the present invention, the first cut line patterns are equally spaced apart along the X-axis direction of the screen pattern, and the second cut line patterns are equally spaced apart along the Y-axis direction of the screen pattern.
In the invention, the first blank area is rectangular, the first cutting line pattern is rectangular, and the product pattern is rectangular.
As a preferred embodiment of the present invention, the first blank area has a dimension a in the Y-axis direction, the first blank area has a dimension b in the X-axis direction, the first cutting line pattern has a dimension d in the X-axis direction, and the product pattern has a dimension e in the Y-axis direction, which satisfies at least one of the following three conditions: (1) a is more than 0 and less than or equal to 0.5e; (2) a is less than or equal to b and less than d; (3) e < d.ltoreq.2e.
According to the research, under the condition that a is more than or equal to b and less than or equal to d and e is more than or equal to d and less than or equal to 2e, if a is more than or equal to 0.5e, the width of a first blank area in a first cutting line is moderate, and the phenomenon of poor edge disassembly caused by oversized cutting line in the Y-axis direction can not occur; if a >0.5e, the first blank area in the first cutting line is easily recognized in the subsequent cutting process, and the cutting line is easily difficult to recognize in the subsequent cutting because of poor trimming.
According to the research, under the condition that a is more than or equal to 0 and less than or equal to 0.5e and e is more than or equal to d and less than or equal to 2e, if a is more than or equal to b and less than or equal to d, the first cutting line is divided into a plurality of small areas by the first blank area, and the consistency of the thickness of the first cutting line and the thickness of the inner electrode can be effectively improved; if b is smaller than a, the left edge f is too large, and the phenomenon that the thickness of the first dividing line is inconsistent with the thickness of the inner electrode is easy to occur; if b > d, the first cutting line is divided into small squares by the first blank area, which is easy to cause deformation of the cutting line on the ceramic film during lamination.
According to the research, under the condition that a is more than 0 and less than or equal to 0.5e and a is more than or equal to b and less than or equal to d, if e is more than or equal to d and less than or equal to 2e, the first cutting line can better meet the requirement of cutting alignment precision, and the size uniformity of the cut green body is good; if d is smaller than e, the size of the first cutting line in the X-axis direction is relatively small, the requirement on the alignment precision of the cutting machine is high, and the cutting machine is easy to stop because the cutting line cannot be identified in the cutting process, so that the cutting efficiency is affected; if d > 2e, the dimension of the first cutting line in the X-axis direction is relatively too large, and when the cutting machine performs cutting on the first cutting line, the identifiable range is too large, so that the cut green body has the defect of poor dimension uniformity.
Therefore, the present invention preferably satisfies the following three conditions simultaneously: (1) a is more than 0 and less than or equal to 0.5e; (2) a is less than or equal to b and less than d; (3) e < d.ltoreq.2e. Further preferably, the following condition is satisfied: a=0.5 e and b=e.
Further preferably, in the first cutting line pattern, a distance between two adjacent first blank areas is c, and the following condition is satisfied: c=e.
In the present invention, the condition of c=e is satisfied, and the same uniformity of the cut line formed by printing and the internal electrode can be ensured.
In a second aspect, the present invention provides a method for manufacturing a capacitor, including the steps of:
(1) Preparing a ceramic film, printing electrode slurry on the ceramic film by adopting the screen printing equipment according to the first aspect, and stripping to obtain a printing sheet;
(2) Laminating the printing sheets obtained in the step (1), and then cutting to obtain a laminated body;
(3) And (3) sintering the laminated body obtained in the step (2) to obtain the capacitor.
As a preferred embodiment of the present invention, in the step (1), the method for preparing a ceramic thin film includes: the ceramic slurry is cast to form a ceramic film.
As a preferred embodiment of the present invention, the step (2) specifically includes: and (3) laminating the printing sheets obtained in the step (1) to a preset layer number, performing isostatic pressing treatment, and then performing longitudinal and transverse cutting by a cutting machine to obtain a laminated body.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the first blank areas are arranged in the first cutting line pattern, electrode paste printing is performed on the ceramic film through the screen printing equipment designed by the specific pattern, the formed first cutting line has good size consistency, the thickness of the first cutting line is consistent with that of the inner electrode, so that the first cutting line is not easy to deform when laminated and pressed, the situation that the inner electrode adjacent to the first cutting line is offset when laminated is reduced, and the cutting qualification rate is greatly improved.
Drawings
FIG. 1 is a schematic plan view of a printing screen in a conventional printing apparatus;
FIG. 2 is a schematic plan view of a printing screen provided by the present invention;
FIG. 3 is an enlarged view of portion A of FIG. 2;
FIG. 4 is a schematic illustration of a staggered lamination of single printed sheets provided by the present invention;
FIG. 5 is a 3D laser microscope measurement of the inner electrode square and the first cut line square of example 3;
FIG. 6 is a schematic plan view of the isostatically treated green body of example 3;
FIG. 7 is a 3D laser microscope measurement of the electrode square and the first cut line square of comparative example 6;
fig. 8 is a schematic plan view of the isostatically treated green body of comparative example 6.
Detailed Description
For a better description of the objects, technical solutions and advantages of the present invention, the present invention will be further described with reference to the following specific examples. It will be appreciated by persons skilled in the art that the specific embodiments described herein are for purposes of illustration only and are not intended to be limiting.
The reagents, methods and apparatus employed in the present invention, unless otherwise specified, are all conventional in the art.
Example 1
The screen printing equipment for the capacitor comprises a printing screen, wherein screen patterns of the printing screen are shown in fig. 2-3, the screen patterns comprise a product area, a cutting line area and a fixing area, the cutting line area and the fixing area are arranged around the product area, a plurality of first cutting line patterns 1 and a plurality of second cutting line patterns 2 are arranged in the cutting line area, a plurality of product patterns 3 are arranged in the product area, a plurality of fixing block patterns 4 are arranged in the fixing area, and the product patterns 3, the first cutting line patterns 1, the second cutting line patterns 2 and the fixing block patterns 4 are arranged according to a preset rule to form a screen pattern; a plurality of first blank areas 5 are arranged in the first cutting line graph 1, and the first blank areas 5 are uniformly distributed along the Y-axis direction of the first cutting line graph 1.
The product patterns 3 are uniformly distributed in the product area according to the requirements of the 0201 specification capacitor, the product patterns 3 are used for penetrating pulp, and corresponding inner electrodes are formed on the ceramic film; the fixed block graph 4 is used for penetrating pulp and plays a role of fixing the printing sheet when being laminated; the area of the first cutting line graph 1 except the first blank area 5 is a filling area, the filling area of the first cutting line graph 1 is used for penetrating pulp, and a first cutting line corresponding to the first cutting line graph 1 is formed on the ceramic film; the second cutting line graph 2 is used for penetrating pulp, and a second cutting line corresponding to the second cutting line graph 2 is formed on the ceramic film; the first cutting line patterns 1 are uniformly distributed along the X-axis direction of the screen pattern, the second cutting line patterns 2 are uniformly distributed along the Y-axis direction of the screen pattern, a second blank area 6 is reserved between two adjacent first cutting line patterns 1, the second blank area 6 is used for cutting alignment, a third blank area 7 is arranged between two adjacent second cutting line patterns 2, and the third blank area 7 is also used for cutting alignment.
The first cutting line pattern 1, the second cutting line pattern 2, the product pattern 3 and the first blank area 5 are rectangular.
The first blank area 5 has a dimension a in the Y-axis direction, the first blank area 5 has a dimension b in the X-axis direction, the distance between two adjacent first blank areas 5 in the first cutting line pattern 1 has a dimension c, the first cutting line pattern 1 has a dimension d in the X-axis direction, the product pattern 3 has a dimension e in the Y-axis direction, the product pattern 3 has a dimension 4e in the X-axis direction, the distance between two adjacent product patterns 3 in the X-axis direction of the screen pattern has a dimension 0.5e, the distance between two adjacent product patterns 3 in the Y-axis direction of the screen pattern has a dimension 0.5e, and the distance between two adjacent first cutting line patterns 1 has a dimension 0.5d, wherein a=0.2e, b=e, c=e, and d=1.5e.
The preparation method of the capacitor provided by the embodiment comprises the following steps:
(1) Uniformly mixing ceramic powder, an organic adhesive and an organic solvent to obtain ceramic slurry, casting the ceramic slurry to form a ceramic film, and screen printing nickel slurry on the ceramic film by adopting screen printing equipment to obtain a printing sheet; the ceramic slurry is prepared from the following raw materials in parts by weight: 60 parts of barium titanate ceramic powder with the average particle size of 300nm, 20 parts of mixed solvent, 12 parts of adhesive and 0.05 part of plasticizer, wherein the mixed solvent is formed by mixing ethanol and toluene according to the weight ratio of 1:1, the adhesive is formed by mixing polyvinyl butyral and solvent according to the weight ratio of 3:7, and the plasticizer is dioctyl phthalate;
(2) Laminating the printing sheets to 100 layers to form a green body, firstly cutting the fixed printing sheets by using a laminating machine to obtain single-sheet printing sheets, then carrying out staggered stacking on the single-sheet printing sheets for multiple times along the X-axis direction of the silk screen patterns according to the length R to obtain a laminated body (a staggered stacking schematic diagram of the two single-sheet printing sheets is shown in figure 4, R=the distance between two adjacent first cutting line patterns 1+the dimension of the first cutting line patterns 1 in the X-axis direction, namely R=1.5 d), carrying out isostatic pressing treatment on the green body, and then carrying out longitudinal and transverse cutting according to the alignment identification positions of the cutting line patterns to obtain the laminated body;
(3) And (3) sintering the laminated body obtained in the step (2) to obtain the capacitor.
Example 2
The present embodiment provides a screen printing apparatus of a capacitor and a manufacturing method of a capacitor, and is different from embodiment 1 in that in the present embodiment, a=0.4e.
Example 3
The present embodiment provides a screen printing apparatus of a capacitor and a manufacturing method of a capacitor, and is different from embodiment 1 in that in the present embodiment, a=0.5 e.
Example 4
The present embodiment provides a screen printing apparatus of a capacitor and a manufacturing method of a capacitor, and is different from embodiment 1 in that in the present embodiment, a=0.5e and b=0.6e.
Example 5
The present embodiment provides a screen printing apparatus of a capacitor and a manufacturing method of a capacitor, and is different from embodiment 1 in that in the present embodiment, a=0.5e and b=0.7e.
Example 6
The present embodiment provides a screen printing apparatus of a capacitor and a manufacturing method of a capacitor, and is different from embodiment 1 in that in the present embodiment, a=0.5e and b=0.8e.
Comparative example 1
The present embodiment provides a screen printing apparatus of a capacitor and a manufacturing method of a capacitor, and is different from embodiment 1 in that in the present embodiment, a=0.6e.
Comparative example 2
The present embodiment provides a screen printing apparatus of a capacitor and a manufacturing method of a capacitor, and is different from embodiment 1 in that in the present embodiment, a=e.
Comparative example 3
The present embodiment provides a screen printing apparatus of a capacitor and a manufacturing method of a capacitor, and is different from embodiment 1 in that in the present embodiment, a=0.5e and b=0.3 e.
Comparative example 4
The present embodiment provides a screen printing apparatus of a capacitor and a manufacturing method of a capacitor, and is different from embodiment 1 in that in the present embodiment, a=0.5e and b=0.4e.
Comparative example 5
The present comparative example provides a screen printing apparatus of a capacitor and a method of manufacturing a capacitor, and is different from example 1 in that in the present example, a=0.5e and b=2e.
Comparative example 6
The present comparative example provides a screen printing apparatus for a capacitor and a method of manufacturing a capacitor, and is different from example 1 in that the first cutting line pattern of the present comparative example is not provided with a first blank region.
Effect example 1
In the preparation of the capacitors of the above examples and comparative examples, the following performance tests were conducted:
(1) Hump measurement: cutting 5 square sheets of 0.1mm multiplied by 0.1mm on the printing sheet in the area corresponding to the product area, wherein each square sheet comprises at least one inner electrode, and the square sheets are marked as inner electrode square sheets; cutting out 3 square sheets with the thickness of 0.1mm multiplied by 0.1mm in the area corresponding to the first cutting line area on the printing sheet, wherein each square sheet comprises at least one first cutting line and is marked as a first cutting line square sheet; testing each square sheet by using a 3D laser microscope, processing the measured value by using VK analysis software and calculating the thickness of the coated nickel slurry; hump refers to the non-uniform thickness of the nickel layer of the printed pattern, generally the thickness of the nickel slurry coated on two sides is higher than that of the nickel slurry coated in the middle, and the hump duty ratio is calculated in the following way: (side thickness-middle thickness)/side thickness×100%.
(2) Thickness measurement: the thickness of the internal electrode and the thickness of the first cut line of the green body were measured using a micrometer, and the positions of 10 positions of the internal electrode and the first cut line were measured, and an average value was obtained.
(3) Cutting qualification rate: and (3) checking the cut laminated body, judging the laminated body cut to the inner electrode as NG, and calculating the cutting qualification rate by the following formula: (total weight of laminate-weight of NG laminate)/total weight of laminate x 100%.
The results of the performance tests are shown in Table 1 below and in FIGS. 5-8:
TABLE 1
As can be seen from table 1, in the green sheets prepared in examples 1 to 6, the difference in thickness between the internal electrode and the first cut line was 10um or less, and in particular, the difference in thickness between the internal electrode and the first cut line was 1um or less, and it can be seen that the first cut line and the internal electrode were made to have good consistency in thickness by designing the first blank region in the first cut line pattern. As can be seen from fig. 5, in example 3, after the first blank region is provided on the first cutting line pattern, the thickness of the first cutting line is identical to the thickness of the internal electrode, the 3D patterns are all distributed in a droplet shape, and are identical to the internal electrode patterns, and no hump is formed. Whereas the cut qualification rate of example 3 reached 100%, which indicates that the first cut lines were not deformed after lamination of the printed sheets, and the first cut lines remained in a regular shape as shown in fig. 6 after lamination.
As is clear from Table 1, the difference between the thickness of the inner electrode and the thickness of the first cut line in comparative example 6 exceeds 27 μm, and the yield of the cut product is as low as 62.5%. As can be seen from fig. 7, the 3D laser microscope measurement images of the first cut line square sheet and the internal electrode square sheet in comparative example 6 are obviously inconsistent, the thickness of the internal electrode is distributed in a water drop shape, and no hump exists; and the first cutting line pattern is in a shape of a cat ear, and the hump accounts for 56.2 percent. From this, it can be seen that, in comparative example 6, the first cut line of the printed sheet is thicker due to the first blank region not being disposed in the first cut line pattern, and the first cut line is irregularly deformed as shown in fig. 8 during lamination, so that an alignment error occurs when the first cut line is used for performing the alignment, and thus the product region is cut incorrectly, and the cut yield of the final product is very low.
As is clear from the comparison of the data of examples 1 to 6 and comparative examples 1 to 2 in Table 1, a >0.5e in comparative examples 1 to 2, the hump shape does not appear in the thickness distribution of the first cut line, but the first blank area is easily recognized during the cutting alignment because the value of a is large, the edge cutting defect is caused, and the cutting qualification rate is greatly reduced.
As is clear from the comparison of the data of examples 1 to 6 and comparative examples 3 to 4 in Table 1, in the case where 0 < a.ltoreq.0.5 e and e < d.ltoreq.2 e are satisfied, a > b in comparative examples 3 to 4 causes excessive margin f, the thickness distribution of the first cut line takes the shape of hump, the hump ratio is as high as 28% and 39%, respectively, and the consistency of the thickness of the first cut line and the thickness of the inner electrode is poor.
As is clear from the comparison of the data of examples 1 to 6 and comparative example 5 in Table 1, when 0 < a.ltoreq.0.5 e and e < d.ltoreq.2 e are satisfied, b > d in comparative example 5, the first cut line is divided into small squares by the first blank region, which easily causes deformation of the cut line on the ceramic film at the time of lamination, resulting in a large reduction in the cut yield, and the cut yield of comparative example 5 is only 38%.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted equally without departing from the spirit and scope of the technical solution of the present invention.
Claims (10)
1. The screen printing equipment for the capacitor is characterized by comprising a printing screen, wherein the screen pattern of the printing screen comprises a product area, a cutting line area and a fixing area, the cutting line area and the fixing area are arranged around the product area, a plurality of product patterns are arranged in the product area, a plurality of first cutting line patterns and a plurality of second cutting line patterns are arranged in the cutting line area, a plurality of fixing block patterns are arranged in the fixing area, and the product patterns, the first cutting line patterns, the second cutting line patterns and the fixing block patterns are arranged and combined into the screen pattern according to a preset rule; a plurality of first blank areas are arranged in the first cutting line pattern, and the first blank areas are uniformly distributed along the Y-axis direction of the first cutting line pattern; the first cutting line patterns are distributed at equal intervals along the X-axis direction of the silk screen patterns, and a second blank area is reserved between two adjacent first cutting line patterns; the area of the first cutting line pattern, from which the first blank area is removed, is a filling area, the size of the first blank area in the Y-axis direction is a, the size of the first blank area in the X-axis direction is b, and the size of the first cutting line pattern in the X-axis direction is d, so that a is less than or equal to b < d.
2. The screen printing apparatus of claim 1, wherein the product pattern is used for paste permeation, and corresponding internal electrodes are formed on the ceramic film.
3. The screen printing apparatus of claim 1, wherein the filling area of the first cutting line pattern is used for paste penetration, and a first cutting line corresponding to the first cutting line pattern is formed on the ceramic film; the second cutting line pattern is used for penetrating pulp, and a second cutting line corresponding to the second cutting line pattern is formed on the ceramic film.
4. The screen printing apparatus of claim 1, wherein the first cut line patterns are equally spaced along an X-axis direction of the screen pattern, and the second cut line patterns are equally spaced along a Y-axis direction of the screen pattern.
5. The screen printing apparatus of a capacitor according to claim 1, wherein the product pattern has a dimension e in the Y-axis direction satisfying at least one of the following two conditions: (1) a is more than 0 and less than or equal to 0.5e; (2) e < d.ltoreq.2e.
6. The screen printing apparatus of a capacitor according to claim 5, wherein the following condition is satisfied: a=0.5 e and b=e.
7. The screen printing apparatus of claim 5, wherein in the first cut line pattern, a spacing between adjacent two first blank areas is c, the following condition is satisfied: c=e.
8. The preparation method of the capacitor is characterized by comprising the following steps:
(1) Preparing a ceramic film, printing electrode paste on the ceramic film by adopting the screen printing equipment according to any one of claims 1 to 7, and stripping to obtain a printing sheet;
(2) Laminating the printing sheets obtained in the step (1), and then cutting to obtain a laminated body;
(3) And (3) sintering the laminated body obtained in the step (2) to obtain the capacitor.
9. The method of manufacturing a capacitor according to claim 8, wherein in the step (1), the method of manufacturing a ceramic thin film comprises: the ceramic slurry is cast to form a ceramic film.
10. The method of manufacturing a capacitor according to claim 8, wherein the step (2) specifically comprises: and (3) laminating the printing sheets obtained in the step (1) to a preset layer number, performing isostatic pressing treatment, and then performing longitudinal and transverse cutting by a cutting machine to obtain a laminated body.
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