CN115384178A - Screen printing equipment of capacitor and preparation method of capacitor - Google Patents

Screen printing equipment of capacitor and preparation method of capacitor Download PDF

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Publication number
CN115384178A
CN115384178A CN202211218834.0A CN202211218834A CN115384178A CN 115384178 A CN115384178 A CN 115384178A CN 202211218834 A CN202211218834 A CN 202211218834A CN 115384178 A CN115384178 A CN 115384178A
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cutting line
area
patterns
pattern
capacitor
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CN202211218834.0A
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CN115384178B (en
Inventor
马艳红
张磊
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Chaozhou Three Circle Group Co Ltd
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Chaozhou Three Circle Group Co Ltd
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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, LIGHT-SENSITIVE OR TEMPERATURE-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, LIGHT-SENSITIVE OR TEMPERATURE-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, LIGHT-SENSITIVE OR TEMPERATURE-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, LIGHT-SENSITIVE OR TEMPERATURE-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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Mechanical Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Fixed Capacitors And Capacitor Manufacturing Machines (AREA)

Abstract

The invention relates to a screen printing device of a capacitor and a preparation method of the capacitor, belonging to the technical field of component manufacturing. The screen printing equipment of the capacitor comprises a printing screen, 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 fixed block patterns are arranged in the fixing area; a plurality of first blank areas are arranged in the first cutting line graph and are uniformly distributed along the Y-axis direction of the first cutting line graph. The first cutting line formed by printing on the ceramic film by the screen printing equipment provided by the invention has good size consistency, and the thickness consistency of the first cutting line and the inner electrode is good, so that the first cutting line is not easy to deform during laminating and pressing, and the qualification rate of products is ensured.

Description

Screen printing equipment of capacitor and preparation method of capacitor
Technical Field
The invention belongs to the technical field of component manufacturing, and relates to a screen printing device of a capacitor and a preparation method of the capacitor.
Background
The multilayer ceramic capacitor is one of the chip components which are used in the largest amount and developed at the fastest speed in the world at present. The surface-mounted multilayer ceramic capacitor element is manufactured in a mutual alternation mode of a dielectric medium and an electrode, is applied to digital products such as televisions, mobile phones, computers, medical instruments, video recorders and the like, and is widely applied to coupling, filtering, oscillating and bypass circuits in electronic complete machines of industrial automation control equipment.
At present, a multilayer ceramic capacitor is mainly prepared by casting ceramic slurry into a dielectric layer, then printing an inner electrode on the dielectric layer through printing equipment, and then laminating, pressing and sintering the dielectric layer printed with the inner electrode. As shown in fig. 1, a conventional printing screen has screen patterns including a cut line pattern distributed along an X-axis direction, a cut line pattern distributed along a Y-axis direction, and a product pattern, where the product pattern is used for forming an inner electrode by penetrating a paste during printing, and the cut line pattern is used for forming a cut line by penetrating a paste during printing, and the printing screen has the following problems in practical applications: after electrode slurry is printed 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 easy to deform due to the fact that the thicknesses of the cutting line and the inner electrode are not consistent during subsequent pressing, so that the problem that internal products of a laminated body are cut and wasted in a subsequent cutting process is caused.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides the screen printing equipment for the capacitor and the preparation method for the capacitor.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
in a first aspect, the invention provides a screen printing device for a capacitor, which comprises a printing screen, wherein screen patterns of the printing screen 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 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 screen patterns according to a preset rule; a plurality of first blank areas are arranged in the first cutting line graph and 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, and the product patterns are used for penetrating slurry to form corresponding inner electrodes on the ceramic film; the fixed block pattern is used for penetrating paste and plays a role in fixing the printing sheets during lamination, the laminator firstly cuts the fixed printing sheets to obtain single printing sheets, and the single printing sheets are then subjected to multiple staggered stacking along the X-axis direction of the screen pattern according to the length R to obtain a laminated body; the area of the first cutting line pattern except the first blank area is a filling area, the filling area of the first cutting line pattern is used for penetrating slurry, 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 slurry, and a second cutting line corresponding to the second cutting line pattern is formed on the ceramic film; first cutting line figure and second cutting line figure are used for cutting the lamination body and obtain the unburned bricks, and first cutting line figure is followed the X axle direction evenly distributed of silk screen figure, and second cutting line figure is followed the Y axle direction evenly distributed of silk screen figure leaves the blank area of second between two adjacent first cutting line figures, the blank area of second is used for cutting counterpoint, the blank area of third between two adjacent second cutting line figures, the blank area of third also is used for cutting counterpoint.
According to the invention, the first blank areas are arranged in the first cutting line pattern, and the screen printing equipment designed by the specific pattern is used for printing the electrode slurry on the ceramic film, so that the formed first cutting line has good size consistency, the first cutting line and the inner electrode have good thickness consistency, the first cutting line is not easy to deform during lamination and pressing, the condition that the position of the inner electrode adjacent to the first cutting line is deviated 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 in an X-axis direction of the screen pattern, and the second cut line patterns are equally spaced in a 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.
In a preferred embodiment of the present invention, a dimension of the first blank area in the Y-axis direction is a, a dimension of the first blank area in the X-axis direction is b, a dimension of the first cutting line pattern in the X-axis direction is d, and a dimension of the product pattern in the Y-axis direction is e, and at least one of the following three conditions is satisfied: (1) a is more than 0 and less than or equal to 0.5e; (2) a is more than or equal to b and less than d; and (3) d is more than e and less than or equal to 2e.
According to research, under the conditions that a is more than or equal to b and less than d and e is more than or equal to e and less than or equal to 2e, if a is more than 0 and less than or equal to 0.5e, the width of the first blank area in the first cutting line is moderate, and the phenomenon of poor edge dismantling caused by overlarge size of the cutting line in the Y-axis direction can be avoided; if a is greater than 0.5e, the first blank area in the first dicing line is easily recognized in the subsequent dicing step, which may cause defective trimming, and the dicing line may be difficult to recognize in the subsequent dicing.
According to research, under the conditions that a is more than 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 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 less than a, the remaining edge f is too large, so that the phenomenon that the thickness of the first dividing line is inconsistent with that of the inner electrode is easy to occur; if b is larger than d, the first cutting line is divided into small squares by the first blank area, which easily causes the deformation of the cutting line on the ceramic film during pressing.
According to research, under the conditions 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 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 a cut green body is good; if d is less than e, the size of the first cutting line in the X-axis direction is relatively too small, the requirement on the alignment precision of the cutting machine is high, the cutting machine is easy to stop because the cutting line cannot be identified in the cutting process, and the cutting efficiency is further influenced; if d > 2e, the size of the first cutting line in the X-axis direction is relatively too large, and the recognizable range is too large when the cutting machine cuts the first cutting line, resulting in a defect of poor size uniformity of the cut green body.
Therefore, the present invention preferably satisfies the following three conditions at the same time: (1) a is more than 0 and less than or equal to 0.5e; (2) a is more than or equal to b and less than d; and (3) d is more than e and less than or equal to 2e. Further preferably, the following condition is satisfied: a =0.5e and b = e.
Further preferably, in the first cutting line pattern, a distance between two adjacent first blank regions is c, and the following condition is satisfied: c = e.
In the present invention, the condition of c = e is satisfied, and it is possible to ensure that the scribe line and the internal electrode formed by printing have the same uniformity.
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 in the first aspect, and stripping to obtain a printing sheet;
(2) Cutting the printed sheets obtained in the step (1) after laminating 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 comprises: 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 number of layers, carrying out isostatic pressing treatment, and then carrying out longitudinal and transverse cutting through 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, and the electrode slurry is printed on the ceramic film by the screen printing equipment designed by the specific pattern, so that the formed first cutting line has good size consistency, the thickness of the first cutting line is consistent with that of the inner electrode, the first cutting line is not easy to deform during lamination and pressing, the condition that the position of the inner electrode adjacent to the first cutting line shifts during lamination is reduced, and the cutting qualification rate is greatly improved.
Drawings
Figure 1 is a schematic plan view of a printing screen in a prior art printing apparatus;
figure 2 is a schematic plan view of a printing screen according to the present invention;
FIG. 3 is an enlarged view of portion A of FIG. 2;
FIG. 4 is a schematic view of a single printed sheet being stacked in a staggered manner according to the present invention;
FIG. 5 is a 3D laser microscope image of the square inner electrode piece and the square first cutting line piece of example 3;
FIG. 6 is a schematic plan view of a green body after isostatic pressing treatment according to example 3;
FIG. 7 is a 3D laser microscopic measurement of the square piece of the inner electrode and the square piece of the first cut line of comparative example 6;
FIG. 8 is a schematic plan view of a green article after isostatic pressing treatment in comparative example 6.
Detailed Description
To better illustrate the objects, aspects and advantages of the present invention, the present invention will be further described with reference to specific examples. It should be understood by those skilled in the art that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The reagents, methods and equipment adopted by the invention are conventional in the technical field if no special description is given.
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, each screen pattern comprises a product area, a cutting line area and a fixing area, the cutting line areas and the fixing areas 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 areas, a plurality of product patterns 3 are arranged in the product area, a plurality of fixing block patterns 4 are arranged in the fixing areas, and the plurality of product patterns 3, the plurality of first cutting line patterns 1, the plurality of second cutting line patterns 2 and the plurality of fixing block patterns 4 are arranged and combined into a screen pattern according to a preset rule; 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.
A plurality of product patterns 3 are uniformly distributed in the product area according to the requirement of the capacitor with the 0201 specification, the product patterns 3 are used for penetrating slurry, and corresponding inner electrodes are formed on the ceramic film; the fixed block pattern 4 is used for penetrating paste and plays a role in fixing the printing sheets during lamination; 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 slurry, and a first cutting line corresponding to the first cutting line graph 1 is formed on the ceramic film; the second cutting line pattern 2 is used for penetrating slurry, and a second cutting line corresponding to the second cutting line pattern 2 is formed on the ceramic film; first cutting line figure 1 is followed the X axle direction evenly distributed of screen pattern, second cutting line figure 2 is followed the Y axle direction evenly distributed of screen pattern, leaves second blank 6 between two adjacent first cutting line figures 1, second blank 6 is used for the cutting counterpoint, and third blank 7 between 2 of two adjacent second cutting line figures, third blank 7 also is used for the cutting counterpoint.
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 dimension of the first blank area 5 in the Y-axis direction is a, the dimension of the first blank area 5 in the X-axis direction is b, the distance between two adjacent first blank areas 5 in the first cutting line pattern 1 is c, the dimension of the first cutting line pattern 1 in the X-axis direction is d, the dimension of the product pattern 3 in the Y-axis direction is e, the dimension of the product pattern 3 in the X-axis direction is 4e, the distance between two adjacent product patterns 3 in the X-axis direction of the screen pattern is 0.5e, the distance between two adjacent product patterns 3 in the Y-axis direction of the screen pattern is 0.5e, and the distance between two adjacent first cutting line patterns 1 is 0.5d, wherein a =0.2e, b = e, c = e, 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, carrying out tape casting on the ceramic slurry to form a ceramic film, and carrying out screen printing on the ceramic film by using the 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, cutting the fixed printing sheets by using a laminator to obtain single printing sheets, then carrying out multiple staggered stacking on the single printing sheets along the X-axis direction of the screen pattern according to the length R to obtain a laminated body (the staggered stacking schematic diagram of the two single printing sheets is shown in FIG. 4, R = the distance between two adjacent first cutting line patterns 1 + the size 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 contraposition recognition 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 is different from embodiment 1 in that a =0.4e in the present embodiment.
Example 3
The present embodiment is different from embodiment 1 in that a =0.5e in the present embodiment.
Example 4
The present example, which is different from example 1 in that a =0.5e and b =0.6e, provides a screen printing apparatus for a capacitor and a method for manufacturing a capacitor.
Example 5
The present embodiment is different from embodiment 1 in that a =0.5e and b =0.7e in the present embodiment.
Example 6
The present embodiment is different from embodiment 1 in that a =0.5e and b =0.8e in the present embodiment.
Comparative example 1
The present embodiment is different from embodiment 1 in that a =0.6e in the present embodiment, and provides a screen printing apparatus of a capacitor and a manufacturing method of the capacitor.
Comparative example 2
The present embodiment is different from embodiment 1 in that a = e in the present embodiment.
Comparative example 3
The present example, which is different from example 1 in that a =0.5e and b =0.3e, provides a screen printing apparatus for a capacitor and a method of manufacturing a capacitor.
Comparative example 4
The present embodiment, which differs from embodiment 1 in that a =0.5e and b =0.4e in the present embodiment, provides a screen printing apparatus for capacitors and a method for manufacturing capacitors.
Comparative example 5
The present comparative example, which is different from example 1 in that a =0.5e and b =2e in the present example, provides a screen printing apparatus of a capacitor and a manufacturing method of a capacitor.
Comparative example 6
The present comparative example, which is different from example 1 in that the first blank area is not provided in the first cutting line pattern of the present comparative example, provides a screen printing apparatus of a capacitor and a method of manufacturing the capacitor.
Effect example 1
In the preparation of the capacitors of the above examples and comparative examples, the following performance tests were performed:
(1) Hump measurement: cutting 5 square sheets of 0.1mm multiplied by 0.1mm in the area of the printed sheet corresponding to the product area, wherein each square sheet comprises at least one internal electrode and is marked as an internal electrode square sheet; cutting 3 square sheets of 0.1mm multiplied by 0.1mm in the area of the printing sheet corresponding to the first cutting line area, wherein each square sheet comprises at least one first cutting line and is marked as a first cutting line square sheet; testing each square piece using a 3D laser microscope, processing the measurements using VK analysis software and calculating the thickness of the coated nickel slurry; the thickness of the nickel layer of the hump finger printed pattern is not consistent, the thickness of the nickel slurry coated on two sides is generally higher than that of the nickel slurry coated in the middle, and the hump proportion calculation mode is as follows: (thickness on both sides-middle thickness)/thickness on both sides x 100%.
(2) And (3) thickness measurement: and measuring the thickness of the inner electrode and the thickness of the first cutting line of the green body by using a micrometer, measuring the positions of the inner electrode and the first cutting line at 10 positions respectively, and averaging.
(3) Cutting qualification rate: the cut laminate was examined, and the laminate cut to the inner electrode was judged to be NG, and the calculation formula of the cut yield was: (total weight of laminate-weight of NG laminate)/total weight of laminate × 100%.
The results of the performance tests are shown in table 1 below and fig. 5 to 8:
TABLE 1
Figure BDA0003874806760000081
As can be seen from table 1, in the green compacts prepared in examples 1 to 6, the thickness difference between the internal electrode and the first cutting line was within 10um, and particularly the thickness difference between the internal electrode and the first cutting line was reduced to within 1um in example 3, it can be seen that the present invention provides good thickness uniformity between the first cutting line and the internal electrode by designing the first blank region in the first cutting line pattern. As can be seen from fig. 5, in example 3, after the first blank area is formed on the first cutting line pattern, the thickness of the first cutting line is consistent with that of the inner electrode, and the 3D patterns are all distributed in the form of drops, consistent with the inner electrode pattern, and have no hump. The cutting yield of example 3 reaches 100%, which indicates that the first cutting line has no deformation after stacking and laminating the printed sheets, and the first cutting line still maintains the regular shape as shown in fig. 6 after stacking and laminating.
As can be seen from table 1, the difference in thickness between the inner electrode of comparative example 6 and the first cutting line was more than 27um, and the cut yield of the product was as low as 62.5%. As can be seen from fig. 7, the 3D laser microscope measured images of the first cut line square piece and the inner electrode square piece of comparative example 6 are obviously inconsistent, the thickness of the inner electrode is distributed in a droplet shape, and there is no hump; the first cutting line pattern is in a shape of a cat ear, and the hump accounts for 56.2 percent. Therefore, in the comparative example 6, the first blank area is not arranged in the first cutting line pattern, so that the first cutting line of the printed sheet is thick, and the first cutting line is deformed irregularly as shown in fig. 8 in the laminating and pressing process, so that the alignment error occurs when the first cutting line is used for cutting and aligning, the product area is cut incorrectly, and the cutting qualified rate of the final product is low.
Comparing the data of examples 1 to 6 and comparative examples 1 to 2 in table 1, it is understood that a >0.5e in comparative examples 1 to 2 does not show a humped shape in the thickness distribution of the first cut line, but the value a is large, so that the first blank area is easily recognized during the cutting alignment, the cut edge is poor, and the cut yield is greatly reduced.
Comparing the data of examples 1 to 6 and comparative examples 3 to 4 in table 1, it can be seen that a > b in comparative examples 3 to 4 causes excessive margin f and hump shape in the thickness distribution of the first cutting line when 0 < a < 0.5e and e < d < 2e, the hump ratio is as high as 28% and 39%, respectively, and the consistency of the thickness of the first cutting line and the thickness of the inner electrode is poor.
Comparing the data of examples 1 to 6 and comparative example 5 in table 1, it can be seen that in comparative example 5, b > d, the first cutting line is divided into small squares by the first blank area when 0 < a < 0.5e and e < d < 2e, which easily causes the deformation of the cutting line on the ceramic film during the pressing process, resulting in a greatly reduced cutting yield, and the cutting yield of comparative example 5 is only 38%.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims (10)

1. The silk screen printing equipment for the capacitor is characterized by comprising a printing silk screen, wherein silk screen patterns of the printing silk screen 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 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 a silk screen pattern according to a preset rule; a plurality of first blank areas are arranged in the first cutting line graph and are uniformly distributed along the Y-axis direction of the first cutting line graph.
2. The screen printing apparatus for capacitors as claimed in claim 1, wherein said product pattern is used for paste penetration to form corresponding internal electrodes on the ceramic thin film.
3. The screen printing apparatus for capacitors according to claim 1, wherein the area excluding the first blank area in the first cutting line pattern is a filled area, the filled area of the first cutting line pattern is used for slurry penetration, and first cutting lines corresponding to the first cutting line pattern are formed on the ceramic thin film; and the second cutting line pattern is used for penetrating the slurry, and a second cutting line corresponding to the second cutting line pattern is formed on the ceramic film.
4. The screen printing apparatus for capacitors as claimed in claim 1, wherein the first cut line patterns are equally spaced in an X-axis direction of the screen pattern, and the second cut line patterns are equally spaced in a Y-axis direction of the screen pattern.
5. The screen printing apparatus for capacitors as claimed in claim 1, wherein the dimension of said first margin in the X-axis direction is a, the dimension of said first margin in the Y-axis direction is b, the dimension of said first cut line pattern in the X-axis direction is d, the dimension of said product pattern in the Y-axis direction is e, and at least one of the following three conditions is satisfied: (1) a is more than 0 and less than or equal to 0.5e; (2) a is more than or equal to b and less than d; and (3) d is more than e and less than or equal to 2e.
6. The screen printing apparatus for capacitors as claimed in claim 5, wherein the following conditions are satisfied: a =0.5e and b = e.
7. The screen printing apparatus for capacitors as claimed in claim 5, wherein in the first cutting line pattern, a distance between adjacent two first blank areas is c, and the following condition is satisfied: c = e.
8. A preparation method of a capacitor is characterized by comprising the following steps:
(1) Preparing a ceramic film, printing electrode slurry on the ceramic film by using the screen printing equipment according to any one of claims 1 to 7, and stripping to obtain a printing sheet;
(2) Cutting the printed sheets obtained in the step (1) after laminating to obtain a laminated body;
(3) And (3) sintering the laminated body obtained in the step (2) to obtain the capacitor.
9. The method for preparing a capacitor as claimed in claim 8, wherein the method for preparing the ceramic thin film in the step (1) comprises: the ceramic slurry is cast to form a ceramic film.
10. The method for manufacturing a capacitor as claimed in claim 8, wherein the step (2) specifically comprises: and (3) laminating the printing sheets obtained in the step (1) to a preset number of layers, carrying out isostatic pressing treatment, and then carrying out longitudinal and transverse cutting through a cutting machine to obtain a laminated body.
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