Screen printing equipment for capacitor and method for preparing capacitor

Abstract

This embodiment discloses a screen printing device for capacitors and a method for manufacturing the capacitors. The screen printing device includes a printing screen having a screen pattern. The screen pattern includes a target product area and an auxiliary area. The target product area includes a plurality of regularly arranged and evenly distributed internal electrode pattern units, each of which is divided into a plurality of sub-areas of equal area, each of which contains a plurality of regularly arranged and spaced mesh holes. The auxiliary area is disposed around the target product area and includes a plurality of auxiliary pattern units for slurry penetration. The aperture size and spacing of the mesh holes in different sub-areas can be adjusted to control the amount of slurry penetration during printing, thereby adjusting the thickness of the internal electrodes formed in the target product. Furthermore, the thickness difference between adjacent film layers is utilized to fill the gaps, preventing further shifting, tilting, or deformation during transportation, thereby effectively improving product quality.

Description

Technical Field

[0001] The present invention relates to the technical field of capacitor manufacturing, and in particular to a screen printing device for a capacitor and a method for preparing the capacitor. Background Art

[0002] The manufacturing process and precision of high-capacity capacitors are higher than those of conventional capacity capacitors. From casting, screen printing, lamination, cutting to the subsequent processes, higher requirements are placed on employee operations and equipment components. Since the current high-capacity capacitors are produced using traditional graphic screens, a certain thickness of latex is applied to the metal screen according to the screen design pattern to make a stencil, and then the electrodes are printed. At this time, the mesh thickness of the latex area will be higher than the mesh thickness of the area without latex. The center area of ​​the printed electrode will be thinner than the edge area. Due to the thickness difference between the two areas, it is easy to cause the edges of the corresponding upper and lower adjacent diaphragms to shift during lamination. The continuous lamination of multiple layers of diaphragms will cause the electrodes to tilt, and eventually the inner electrodes will be cut out during cutting, resulting in a lower pass rate, a decrease in production, and a waste of raw materials. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention provides a screen printing device for a capacitor and a method for preparing a capacitor.

[0004] In a first aspect, an embodiment of the present application provides a screen printing device for a capacitor, comprising a printing screen having a screen pattern, wherein the screen pattern comprises:

[0005] a target product region, comprising a plurality of regularly arranged and evenly distributed inner electrode pattern units, each of which is divided into a plurality of sub-regions of equal area, each of which is provided with a plurality of regularly arranged and spaced mesh holes, the mesh holes being used to pass slurry to form inner electrodes of the target product;

[0006] The auxiliary area is arranged around the target product area, and the auxiliary area includes a plurality of auxiliary graphic units for pulp penetration.

[0007] In one embodiment, the inner electrode pattern unit is in the shape of a rectangular strip, the sub-region is rectangular, and the mesh holes are arranged equidistantly in the sub-region in the transverse direction.

[0008] In one embodiment, the slurry penetration amounts in the obliquely adjacent sub-regions are the same, and the slurry penetration amounts in the laterally adjacent sub-regions are different.

[0009] In one embodiment, the meshes in the obliquely adjacent sub-regions are first meshes, and the meshes in the laterally adjacent sub-regions are second meshes, and the area of ​​the first meshes is greater than the area of ​​the second meshes.

[0010] In one embodiment, both the first mesh holes and the second mesh holes are regular hexagonal holes, the side length of the first mesh holes is greater than that of the second mesh holes, and the distance between adjacent first mesh holes is less than the distance between adjacent second mesh holes.

[0011] In one embodiment, the following relationship is satisfied between the side length of the first mesh holes and the distance between adjacent first mesh holes: 4b < a < 5b, where a is the side length of the first mesh holes and b is the distance between adjacent first mesh holes.

[0012] In one embodiment, the following relationship is satisfied between the side length of the second mesh holes and the distance between adjacent second mesh holes: 2d < c < 3d, where c is the side length of the second mesh holes and d is the distance between adjacent second mesh holes.

[0013] In one embodiment, the following relationship is satisfied between the side length of the first mesh holes and the side length of the second mesh holes: 3%a < a - c < 5%a, where a is the side length of the first mesh holes and c is the side length of the second mesh holes.

[0014] In one embodiment, the following relationship is satisfied between the distance between adjacent first mesh holes and the distance between adjacent second mesh holes: 3%d < d - b < 5%d, where d is the distance between adjacent second mesh holes and b is the distance between adjacent first mesh holes.

[0015] In a second aspect, an embodiment of the present application further provides a method for manufacturing a capacitor, including the following steps:

[0016] Performing metal electrode paste printing on the diaphragm by the screen printing device for capacitors described in the first aspect, so as to form the inner electrodes of the target product by permeating the paste at the positions corresponding to the inner electrode graphic units on the diaphragm, and forming an auxiliary graphic layer by permeating the paste at the positions corresponding to the auxiliary graphic units on the diaphragm; <00​​​​​​​​​​​​​​​​By dividing each inner electrode graphic unit into multiple sub-regions of equal area, and providing multiple regularly arranged and spaced meshes in each sub-region, the aperture size of the meshes in different sub-regions and the size of the adjacent hole spacing can be adjusted, thereby regulating the amount of slurry penetration during printing to achieve the goal of regulating the thickness of the inner electrode of the target product. In addition, by utilizing the thickness difference between adjacent film layers to fill each other, it is possible to prevent further shifting, tilting or deformation during transportation and transfer, thereby improving the qualified rate of stacking, laminating and cutting, and effectively improving the quality of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 1 is a schematic structural diagram of a chip ceramic capacitor manufactured by the screen printing device of the capacitor according to an embodiment of the present application;

[0024] Figure 2 Schematic diagram of the structure of the screen pattern of the screen printing equipment of the capacitor in the embodiment of the present application;

[0025] Figure 3 Schematic diagram of a single inner electrode unit of a screen printing device for a capacitor according to an embodiment of the present application being divided into multiple sub-regions;

[0026] Figure 4 Schematic diagram of a single electrode pattern unit provided with a mesh in a screen printing device for a capacitor according to an embodiment of the present application;

[0027] Figure 5 1 is a schematic diagram of an embodiment of a single inner electrode unit in a screen printing device for a capacitor according to an embodiment of the present application;

[0028] Figure 6 Schematic diagram of the distribution of mesh of a single electrode pattern unit in the screen printing equipment of the capacitor according to the embodiment of the present application;

[0029] Figure 7 1 is a schematic structural diagram of a first mesh in a screen printing device for a capacitor according to an embodiment of the present application;

[0030] Figure 8 1 is a schematic structural diagram of a second mesh in a screen printing device for a capacitor according to an embodiment of the present application;

[0031] Figure 9 1 is a schematic structural diagram of forming a first mesh and a second mesh in a screen printing device for a capacitor according to an embodiment of the present application;

[0032] Figure 10 1 is another structural schematic diagram of forming a first mesh and a second mesh in a screen printing device for a capacitor according to an embodiment of the present application;

[0033] Figure 11Schematic diagram of the screen printing equipment of the capacitor according to the embodiment of the present application during slurry printing;

[0034] Figure 12 1 is a schematic diagram of another state of the screen printing equipment of the capacitor according to the embodiment of the present application when the slurry is printed;

[0035] Figure 13 Schematic diagram of the screen printing device for the capacitor according to the embodiment of the present application, in which the slurry is printed on the ceramic diaphragm through the first mesh and the second mesh;

[0036] Figure 14 Schematic diagram of a screen printing device for a capacitor according to an embodiment of the present application in a state where slurry diffuses through a first mesh and a second mesh;

[0037] Figure 15 Schematic diagram of the slurry penetration state of the first mesh and the second mesh in the screen printing equipment of the capacitor according to the embodiment of the present application;

[0038] Figure 16 1 is another schematic diagram of the slurry penetration state of the first mesh and the second mesh in the screen printing device of the capacitor according to the embodiment of the present application;

[0039] Figure 17 Schematic diagram of the slurry after being spread and spread on the diaphragm in the screen printing equipment of the capacitor according to the embodiment of the present application;

[0040] Figure 18 This is another schematic diagram of the screen printing device for the capacitor according to the embodiment of the present application after the slurry is spread flat on the diaphragm;

[0041] Figure 19 This is a schematic diagram of the structure of the diaphragm after printing by the screen printing equipment of the capacitor in the embodiment of the present application;

[0042] Figure 20 Schematic diagram of the state in which the diaphragms of the capacitor according to the embodiment of the present application are stacked after printing by the screen printing equipment;

[0043] Figure 21 is another schematic diagram of the state where the diaphragms of the capacitor according to the embodiment of the present application are stacked after printing by the screen printing equipment;

[0044] Figure 22 This is a cross-sectional view of the capacitor of the embodiment of the present application after the diaphragm is printed by the screen printing equipment and laminated;

[0045] Figure 23 It is a flow chart of a method for manufacturing a capacitor according to an embodiment of the present application.

[0046] Figure Number:

[0047] 100, screen pattern; 120, target product area; 122, inner electrode pattern unit; 1222, sub-area; 1222a, first mesh; 1222b, second mesh; 140, auxiliary product area; 200, chip ceramic capacitor; 220, diaphragm; 240, inner electrode; 260, outer electrode; DETAILED DESCRIPTION

[0048] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific embodiments of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "up", "down", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings and are constructed and operated in specific directions. They are only for the convenience of describing the technical solution and do not indicate that the devices or components referred to must have specific directions. Therefore, they should not be understood as limiting the present invention.

[0049] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0050] In the related art, during the manufacturing process of the chip ceramic capacitor 200, it is generally necessary to use capacitor screen printing equipment to print the inner electrode 240 on the diaphragm 220. The chip ceramic capacitor 200 includes a multi-layer ceramic diaphragm 220, an inner electrode 240 and an outer electrode 260. The inner electrode 240 is formed by printing a metal paste on the diaphragm 220 by screen printing. The printed diaphragm 220 is then peeled off and stacked together at a certain distance. A bottom protective layer and a surface protective layer are added. All the diaphragms 220 are compacted by lamination. Then, a certain cutting method is used to cut out a number of capacitor chips. Finally, the chips are sintered at high temperature to form the main part of the ceramic capacitor. The outer electrodes 260 and the inner electrodes 240 are then sealed at both ends of the capacitor to produce a chip ceramic capacitor. However, the current printed screen for capacitors is made by coating a metal screen with latex of a certain thickness according to the screen design pattern. Since the thickness of the screen in the latex area will be higher than the thickness of the screen in the area without latex, the center area of ​​the electrode after printing will be thinner than the edge area. Since there will be a difference in thickness between the two places, it is easy to cause the edges of the upper and lower adjacent diaphragms 220 to shift when stacking. The continuous stacking thickness of the multi-layer diaphragms 220 will cause the internal electrode 240 to be in an irregular defective state such as tilted, twisted, collapsed, etc., which greatly reduces the performance qualification rate of the capacitor product. At the same time, it also reduces the processing qualification rate of the cutting process, resulting in waste of raw materials and seriously affecting production efficiency. To this end, the embodiment of the present application provides a screen printing device for a capacitor. The screen printing device for the capacitor of this embodiment can be used in the step of printing the internal electrode 240 on the diaphragm 220 during the manufacture of the chip ceramic capacitor 200. Among them, please refer to the schematic diagram of the chip ceramic capacitor 200 manufactured by the screen printing device of the capacitor of the present application. Figure 1 .

[0051] For details, please refer to Figures 2 to 4 The screen printing apparatus for a capacitor according to an embodiment of the present application includes a printing screen having a screen pattern 100. The screen pattern 100 includes a target product area 120 and an auxiliary product area 140. The target product area 120 includes a plurality of regularly arranged and evenly distributed inner electrode pattern units 122. Each inner electrode pattern unit 122 is divided into a plurality of sub-areas 1222 of equal area. Each sub-area 1222 is provided with a plurality of regularly arranged and spaced mesh holes, which are used to pass slurry to form the inner electrodes 240 of the target product. The auxiliary area is arranged around the target product area 120 and includes a plurality of auxiliary pattern units for passing slurry.

[0052] Exemplarily, each electrode pattern unit is divided into multiple sub-areas in the horizontal and vertical directions, and the division of each electrode pattern unit is performed based on factors such as product specifications, material properties, machine equipment, and production process.

[0053] It should be noted that the aforementioned "multiple sub-regions 1222" refer to two or more sub-regions, and the specific number to be provided depends on the area of ​​the inner electrode pattern unit 122 and each sub-region 1222. For example, if the area of ​​each inner electrode pattern unit 122 is small, and the area divided by each sub-region 1222 is large, then each inner electrode pattern unit 122 can be divided into two equal sub-regions 1222, but this is not limited to this. Similarly, the aforementioned "multiple inner electrode pattern units 122" can be determined based on the specific type of capacitor being manufactured, and this will not be elaborated on here.

[0054] For example, the “equal areas” mentioned in this embodiment may mean that the area difference of each sub-region 1222 is considered equal within a certain range. For example: if the area difference of two sub-regions 1222 is between 0 and The areas between them can be considered equal; among them, the area of ​​a sub-region 1222 is 6 , the area of ​​another sub-region 1222 is 7 , the difference between their areas is 1 , then the areas of the two sub-regions 1222 can be considered equal.

[0055] The screen printing equipment for capacitors based on the above technical features divides each inner electrode graphic unit 122 into a plurality of sub-areas 1222 of equal area, and provides a plurality of regularly arranged and spaced mesh holes in each sub-area 1222, so that the aperture size of the mesh holes in different sub-areas 1222 and the size of the adjacent hole spacing can be adjusted, thereby regulating the amount of slurry penetration during printing to achieve the purpose of regulating the thickness of the inner electrode 240 of the target product, and utilizing the thickness difference between adjacent film layers to fill each other, thereby preventing further shifting, tilting or deformation during transportation and transfer, thereby improving the qualified rate of stacking, laminating and cutting, and effectively improving the quality of the product.

[0056] In one embodiment, the inner electrode pattern unit 122 is in the shape of a rectangular strip, the sub-region 1222 is in a rectangular shape, and the meshes are arranged equidistantly in the transverse direction within the sub-region 1222. It should be noted that in this embodiment, the "equidistant arrangement" mentioned may mean that the spacing between the outer edges of adjacent meshes is the same, so that they can be arranged at the same spacing in the transverse direction within the sub-region 1222. In addition, the spacing between the meshes in different sub-regions 1222 can be adjusted, thereby controlling the amount of slurry penetration during printing and ensuring the thickness of the inner electrode 240 of the target product.

[0057] In one embodiment, the slurry penetration amounts in the obliquely adjacent sub-regions 1222 are the same, and the slurry penetration amounts in the laterally adjacent sub-regions 1222 are different.

[0058] For example, in order to facilitate understanding of the setting in this embodiment in which the amount of slurry penetration in the obliquely adjacent sub-regions 1222 is the same and the amount of slurry penetration in the laterally adjacent sub-regions 1222 is different, the following example is taken in which the amount of slurry penetration in any sub-region 1222 in the same inner electrode graphic unit 122 is relatively large.

[0059] Please refer to Figure 5 When the amount of slurry permeating the mesh holes in the sub-region 1222e is relatively large, the amount of slurry permeating the mesh holes in the sub-region 1222f adjacent to the side of the sub-region 1222e is relatively small, and the amount of slurry permeating the mesh holes in the sub-region 1222g obliquely adjacent to the sub-region 1222e is also relatively large, and is the same as the amount of slurry permeating the mesh holes in the sub-region 1222e, so that after the nickel slurry is spread flat on the diaphragm 220, the nickel layer thicknesses of the sub-region 1222e and the sub-region 1222g are both thicker, and the nickel layer thickness of the sub-region 1222f is thinner. Then, when the diaphragms 220 with the above structure are stacked back and forth, the four corners of each small square diaphragm 220 divided by the center dotted line corresponding to the horizontal and vertical spacing between the upper and lower adjacent diaphragms 220 are aligned along the vertical dotted line in space (as shown in FIG. Figure 20 and Figure 21 As shown in Figure 1 ). This ensures that half of the nickel layer within any inner electrode pattern unit 122 is distributed horizontally and vertically in equal rectangular sections, with a certain height difference between adjacent sides. Similarly, the rectangular sections of the other half of the nickel layer within the inner electrode pattern unit 122 within the adjacent diaphragm 220 above and below it also have complementary height differences. After being squeezed and slightly deformed, they fit into the corresponding area together with the diaphragm 220. This prevents the diaphragm 220 from moving again after stacking, causing deviation and displacement, achieving a locking effect and ensuring the uniformity and stability of the diaphragm 220 and the block during subsequent lamination and cutting processes.

[0060] Please refer to Figure 6 In one embodiment, the meshes within the obliquely adjacent sub-regions 1222 are first meshes 1222a, and the meshes within the laterally adjacent sub-regions 1222 are second meshes 1222b. The area of ​​the first meshes 1222a is larger than the area of ​​the second meshes 1222b. It should be noted that the purpose of setting the area of ​​the first meshes 1222a larger than the area of ​​the second meshes 1222b is to control the amount of slurry penetration to ensure a certain height difference between adjacent sides, allowing the laminated membrane 220 to fit into the corresponding area and preventing the membrane 220 from moving again after being laminated, causing deviation and displacement.

[0061] Please refer to Figure 7 and Figure 8, in one embodiment, both the first mesh hole 1222a and the second mesh hole 1222b are regular hexagonal holes, the side length of the first mesh hole 1222a is greater than the side length of the second mesh hole 1222b, and the spacing between adjacent first mesh holes 1222a is less than the spacing between adjacent second mesh holes 1222b. Thus, the amount of slurry passing through the first mesh hole 1222a is greater than that passing through the second mesh hole 1222b. Furthermore, a certain height difference can be formed in the nickel layer between adjacent sub-regions 1222 on the side, allowing the laminated diaphragm 220 to be embedded into the corresponding area, preventing problems such as deviation and displacement caused by the diaphragm 220 moving again after being laminated.

[0062] Specifically, the relationship between the side length of the first mesh hole 1222a and the spacing between adjacent first mesh holes 1222a satisfies the following: 4b < a < 5b, where a is the side length of the first mesh hole 1222a and b is the spacing between adjacent first mesh holes 1222a. At the same time, the relationship between the side length of the second mesh hole 1222b and the spacing between adjacent second mesh holes 1222b satisfies the following: 2d < c < 3d, where c is the side length of the second mesh hole 1222b and d is the spacing between adjacent second mesh holes 1222b.

[0063] In one embodiment, the relationship between the side length of the first mesh hole 1222a and the side length of the second mesh hole 1222b satisfies the following: 3%a < a - c < 5%a, where a is the side length of the first mesh hole 1222a and c is the side length of the second mesh hole 1222b. At the same time, the relationship between the spacing between adjacent first mesh holes 1222a and the spacing between adjacent second mesh holes 1222b satisfies the following: 3%d < d - b < 5%d, where d is the spacing between adjacent second mesh holes 1222b and b is the spacing between adjacent first mesh holes 1222a.

[0064] Exemplarily, setting the relationship between the side length of the first mesh hole 1222a and the side length of the second mesh hole 1222b at 3%a < a - c < 5%a, and setting the relationship between the spacing between adjacent first mesh holes 1222a and the spacing between adjacent second mesh holes 1222b at 3%d < d - b < 5%d is jointly determined by factors such as the material properties of the diaphragm 220 used for printing by the screen printing equipment, the material properties of the printing slurry, the accuracy of the production machine equipment, and the specific product dimensions. In one embodiment, the diaphragm 220 is made of ceramic material and the printing slurry is the metal inner electrode 240 slurry. Then the above ranges are jointly determined by the types, particle sizes, adhesion properties, drying properties of the ceramic diaphragm 220 and the metal inner electrode 240 slurry, as well as the accuracy of the production machine equipment and the specific product dimensions. Generally, the amplitude of the horizontal and vertical dimensions is between 3% and 5%, so 3%a < a - c < 5%a; 3%d < d - b < 5%d.

[0065] To facilitate understanding of the process of manufacturing chip ceramic capacitors using the screen printing equipment for capacitors of the present application, the obliquely adjacent sub-regions are named 1222A and the side adjacent sub-regions are named 1222B for ease of explanation below.

[0066] The screen printing device for forming the capacitor of the present application according to the above design (refer to Figure 9 and Figure 10 ), when the screen printing device is used for printing, more slurry passes through the first mesh 1222a in the obliquely adjacent sub-region 1222A, while less slurry passes through the second mesh 1222b in the side adjacent sub-region 1222B (refer to Figure 11 and Figure 12 ), then the slurry is printed on the ceramic diaphragm through the first mesh and the second mesh and spreads out (refer to Figure 13 and Figure 14 ), at this time, the amount of slurry permeation of all obliquely adjacent sub-regions 1222A on the ceramic diaphragm is large, and the amount of slurry permeation of all side adjacent sub-regions 1222B is small (refer to Figure 15 and Figure 16 ), after the slurry is spread and diffused on the membrane, the nickel layer formed in the obliquely adjacent sub-region 1222A is thicker, and the nickel layer formed in the side adjacent sub-region 1222B is thinner (refer to Figure 17 and Figure 18 ).

[0067] When the formed structural membrane is stacked in a reciprocating staggered manner, the metal electrode pattern units of the same horizontal or vertical adjacent metal electrode pattern units in the single-layer ceramic sheet and the electrode pattern units of the two vertically adjacent membrane sheets are staggered and overlapped along half of the center dotted line (refer to Figure 19 and Figure 20 ), at this time, between the two adjacent layers of diaphragms, there are small square diaphragms divided by the central dotted lines with corresponding horizontal and vertical spacing. The four corners of each small square diaphragm are aligned along the vertical dotted lines in space, so that half of the nickel layer in any electrode graphic unit area is distributed horizontally and vertically in equal small rectangular parts, and there is a certain height difference between adjacent sides. The other half of the nickel layer in the electrode graphic unit area of ​​the layer of diaphragm adjacent to it above and below also has a complementary height difference. After being squeezed and slightly deformed together with the ceramic diaphragm, it is embedded in the corresponding area (such as Figure 21 and Figure 22 shown).

[0068] Please refer to Figure 23 , the embodiment of the present application also provides a method for preparing a capacitor, the method comprising the following steps:

[0069] S100, printing the inner electrode 240 on the diaphragm 220: printing the metal electrode paste on the diaphragm 220 using the screen printing equipment for the capacitor described in the first aspect, so that the inner electrode 240 of the target product is formed by the paste at the position corresponding to the inner electrode pattern unit 122 on the diaphragm 220, and the auxiliary pattern layer is formed by the paste at the position corresponding to the auxiliary pattern unit on the diaphragm 220;

[0070] S200, peeling off the printed film 220;

[0071] S300, stacking the peeled membrane sheets 220 in a staggered manner to form blocks;

[0072] S400, performing isostatic hydrostatic pressure on the formed bar blocks;

[0073] S500, cutting the hydrostatically pressurized block.

[0074] Based on the contents of the above embodiments, the capacitor manufacturing method of this embodiment can prevent further displacement, tilting or deformation during transportation and transfer, thereby improving the qualified rate of stacking, laminating and cutting, and effectively improving the quality of the product.

[0075] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A screen printing device for capacitors, characterized in that: Comprising a printing screen, the printing screen having a screen pattern, the screen pattern comprising: A target product area, which includes a plurality of regularly arranged and uniformly distributed inner electrode graphic units, each of the inner electrode graphic units being divided into a plurality of sub-areas with equal areas, and each of the sub-areas having a plurality of regularly arranged and spaced-apart mesh holes, the mesh holes being used for slurry penetration to form the inner electrodes of the target product; An auxiliary area, which is arranged around the target product area, and the auxiliary area includes a plurality of auxiliary graphic units for slurry penetration; Wherein, the slurry penetration amounts in diagonally adjacent sub-areas are the same, and the slurry penetration amounts in side-adjacent sub-areas are different; the mesh holes in diagonally adjacent sub-areas are first mesh holes, and the mesh holes in side-adjacent sub-areas are second mesh holes, and the area of the first mesh hole is larger than the area of the second mesh hole.

2. The screen printing device for capacitors according to claim 1, characterized in that: The inner electrode graphic unit is in a rectangular strip shape, the sub-area is rectangular, and the mesh holes are arranged at equal intervals in the transverse direction within the sub-area.

3. The screen printing device for capacitors according to claim 1, characterized in that: Both the first mesh hole and the second mesh hole are in a regular hexagonal shape, and the side length of the first mesh hole is larger than the side length of the second mesh hole, and the spacing between adjacent first mesh holes is smaller than the spacing between adjacent second mesh holes.

4. The screen printing device for capacitors according to claim 3, characterized in that: The relationship between the side length of the first mesh hole and the spacing between adjacent first mesh holes satisfies the following: 4b < a < 5b, where a is the side length of the first mesh hole and b is the spacing between adjacent first mesh holes.

5. The screen printing device for capacitors according to claim 4, characterized in that: The relationship between the side length of the second mesh hole and the spacing between adjacent second mesh holes satisfies the following: 2d < c < 3d, where c is the side length of the second mesh hole and d is the spacing between adjacent second mesh holes.

6. The screen printing device for capacitors according to claim 5, characterized in that: The relationship between the side length of the first mesh hole and the side length of the second mesh hole satisfies the following: 3%a < a - c < 5%a, where a is the side length of the first mesh hole and c is the side length of the second mesh hole.

7. The screen printing device for capacitors according to claim 6, characterized in that: The relationship between the spacing between adjacent first mesh holes and the spacing between adjacent second mesh holes satisfies the following: 3%d < d - b < 5%d, where d is the spacing between adjacent second mesh holes and b is the spacing between adjacent first mesh holes.

8. A method for preparing a capacitor, characterized in that: Comprising the following steps: Performing metal electrode paste printing on the diaphragm by the screen printing device of the capacitor according to any one of claims 1 to 7, so as to penetrate slurry at the positions corresponding to the inner electrode graphic units on the diaphragm to form the inner electrodes of the target product, and penetrate slurry at the positions corresponding to the auxiliary graphic units on the diaphragm to form an auxiliary graphic layer; Peeling the printed diaphragm; Stacking the peeled diaphragms out of alignment to form a stack; Performing isostatic pressure on the formed stack; Cutting the stack after isostatic pressure.

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