Automatic pasting device and screen printing machine

Abstract

The application relates to an automatic slurry feeding device and a screen printing machine, the automatic slurry feeding device comprising a slurry storage tank provided with a slurry outlet hole and an air inlet hole at the top; an air source pipeline connected with an air source at one end and connected with the inside of the slurry storage tank through the air inlet hole at the other end; a stirrer arranged in the slurry storage tank; a slurry feeding pipeline with one end extending into the slurry storage tank through the slurry outlet hole and the other end used for conveying slurry to a printing mechanism; and a filter arranged on the slurry feeding pipeline and used for filtering large-particle nickel powder in the slurry. The application can effectively suspend the large-particle nickel powder, slow down the sedimentation speed of the large-particle nickel powder in the slurry storage tank and ensure the uniformity of the internal electrode slurry by arranging the stirrer in the slurry storage tank to uniformly mix different components in the internal electrode slurry. The application further arranges the filter in the slurry feeding pipeline to block the large-particle nickel powder, thereby enhancing the consistency of the printed internal electrode slurry, reducing the risk of slurry agglomeration of the electrode after printing of the MLCC product and improving the quality of the MLCC product.

Description

Technical Field

[0001] This application relates to the technical field of MLCC printing, and in particular to an automatic paste-feeding device and a screen printing machine. Background Technology

[0002] MLCC (Multi-layer Ceramic Capacitor), also known as multilayer capacitor or laminated capacitor, is the most widely used type of capacitor. MLCC is formed by stacking ceramic dielectric films with printed electrodes (internal electrodes) in an alternating pattern, sintering them at high temperature to form a ceramic block, and then sealing the ends of the ceramic block with metal layers (external electrodes).

[0003] The internal electrode printing process of MLCC is usually screen printing, which involves printing the internal electrode paste onto the ceramic film through a printing screen, and then drying it to obtain a clear and complete dielectric film.

[0004] With the continuous development of thin-layer and high-capacity technologies in MLCCs, the requirements for internal electrode printing technology are becoming increasingly stringent. Besides printing conditions and fixtures, the main factor affecting the printing effect is the internal electrode paste. Current internal electrode pastes are mainly composed of nickel powder, resin, and organic solvents. Inconsistent unit mass of these components can lead to natural sedimentation issues in the paste. Furthermore, the uniformity of nickel powder particle size cannot be effectively controlled, resulting in varying solid particle sizes within the paste. This poses a risk of paste agglomeration on the electrodes after MLCC product printing. Utility Model Content

[0005] Therefore, it is necessary to provide an automatic slurry feeding device and a screen printing machine that can solve the above-mentioned technical problems.

[0006] The above-mentioned objective of this application is achieved through the following technical solution:

[0007] The first aspect of this application provides a film screen printing machine, comprising:

[0008] The slurry storage tank is equipped with a slurry outlet and an air inlet at the top.

[0009] A gas source pipeline, one end of which is connected to a gas source, and the other end of which is connected to the inside of the slurry storage tank through the air inlet;

[0010] A stirrer is installed inside the slurry storage tank;

[0011] The slurry filling pipe has one end extending into the slurry storage tank through the slurry outlet, and the other end used to deliver slurry to the printing mechanism;

[0012] A filter, installed on the slurry supply pipe, is used to filter out large particles of nickel powder in the slurry.

[0013] In one embodiment, a differential pressure sensor is also included, with its two ends connected to the inlet and outlet of the filter, respectively, for measuring the pressure difference of the slurry across the filter.

[0014] In one embodiment, the two ends of the filter are connected to the slurry filling pipe via quick connectors.

[0015] In one embodiment, the maximum pore size of the filter is 0.6 μm.

[0016] In one embodiment, the slurry storage tank includes a tank body and a top cover, the top cover being disposed on the tank body, and the slurry outlet and the air inlet being disposed on the top cover;

[0017] The agitator is a spiral agitator, which is installed on the top cover and extends downward into the interior of the tank.

[0018] In one embodiment, the spiral blades of the spiral stirrer are spirally upward at a uniform tilt angle, which is between 15° and 30°.

[0019] In one embodiment, the helical blade includes an upper surface and a lower surface, and the outer edges between the upper and lower surfaces are connected to each other by a connecting portion, which is rounded.

[0020] In one embodiment, the maximum width of the connecting portion in the thickness direction of the helical blade is greater than the thickness of the helical blade.

[0021] The second aspect of this application provides a screen printing machine, including the automatic paste feeding device described in the first aspect of this application.

[0022] This application has the following beneficial effects:

[0023] This application incorporates a stirrer in the slurry storage tank to uniformly mix different components such as nickel powder, resin, and organic solvents in the internal electrode slurry. This effectively suspends large nickel powder particles, slowing their settling rate in the slurry storage tank and ensuring the uniformity of the internal electrode slurry. Furthermore, this application includes a filter in the slurry feeding pipe to prevent large nickel powder particles from passing through, enhancing the consistency of the printed internal electrode slurry, reducing the risk of slurry agglomeration on the electrodes after MLCC product printing, and improving the quality of the MLCC product. Additionally, this application reduces turbulence when the spiral blades of the spiral stirrer come into contact with the internal electrode slurry by designing the tilt angle and outer edge rounded corners, thereby reducing the amount of air bubbles generated in the internal electrode slurry. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of an automatic slurry feeding device in an exemplary embodiment;

[0025] Figure 2 This is a schematic diagram of the structure of a spiral stirrer in an exemplary embodiment;

[0026] Figure 3 A schematic diagram of the internal electrode slurry provided by a slurry feeding device in a conventional technology;

[0027] Figure 4 A schematic diagram illustrating the printing effect of internal electrode paste provided by a paste-feeding device in conventional technology;

[0028] Figure 5 This is a schematic diagram of the internal electrode slurry provided by the automatic slurry feeding device according to an embodiment of this application;

[0029] Figure 6 This is a schematic diagram showing the printing effect of the internal electrode paste provided by the automatic paste-feeding device according to an embodiment of this application.

[0030] Explanation of icon numbers:

[0031] 100. Automatic slurry feeding device; 10. Slurry storage tank; 11. Tank body; 12. Top cover; 121. Slurry outlet; 122. Air inlet; 20. Spiral agitator; 21. Screw; 22. Spiral blades; 221. Upper surface; 222. Lower surface; 223. Connecting part; 30. Slurry feeding pipe; 40. Filter; 41. Quick connector; 50. Differential pressure sensor; 60. Pressure control valve; 71. Air source pipe; 72. Air source; 200. Printing mechanism. Detailed Implementation

[0032] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, a detailed description of specific embodiments of this application is provided below. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0035] To address the technical problems mentioned in the background section, this application provides an automatic paste-feeding device that can supply internal electrode paste to the printing mechanism of a screen printing machine, enabling the printing mechanism to print internal electrode patterns on a ceramic film. Figure 1 As shown, in one embodiment, the automatic paste-feeding device 100 includes a paste storage tank 10, which stores the internal electrode paste to be printed. This internal electrode paste mainly consists of nickel powder, resin, organic solvents, etc. Due to inconsistent unit mass of the components, the internal electrode paste may experience natural sedimentation. To address this problem, as... Figure 1 As shown, the slurry storage tank 10 in this embodiment is also equipped with a stirrer, which is used to stir the internal electrode slurry in the slurry storage tank 10 evenly through rotational motion, so as to mix the different components such as nickel powder, resin, and organic solvent in the internal electrode slurry evenly and ensure the uniformity of the internal electrode slurry.

[0036] like Figure 1 As shown, in this embodiment, the top of the slurry storage tank 10 is provided with a slurry outlet 121 and an air inlet 122. An air source pipe 71 is inserted into the air inlet 122, with one end connected to an air source 72 and the other end connected to the interior of the slurry storage tank 10 through the air inlet 122. A slurry feeding pipe 30 is inserted into the slurry outlet 121, with one end extending into the slurry storage tank 10 through the slurry outlet 121 and the other end connected to the printing mechanism 200 for supplying slurry to the printing mechanism 200.

[0037] In this embodiment, the gas source 72 generates gas at a certain pressure and delivers it to the paste storage tank 10 through the gas source pipe 71. The gas pressure causes the internal electrode paste in the paste storage tank 10 to be delivered to the printing mechanism 200 through the paste filling pipe 30. The gas pressure can be changed to alter the flow rate of the internal electrode paste. In some examples, such as... Figure 1 As shown, a pressure control valve 60 is also provided in the slurry filling pipe 30. The pressure control valve 60 can adjust the pressure and flow rate of the electrode slurry in the slurry filling pipe 30.

[0038] In this embodiment, to address the technical problem that the solid particles in the inner electrode paste vary in size, which could lead to paste agglomeration on the electrodes after MLCC product printing, a filter 40 is also installed on the paste feeding pipe 30. The filter 40 is used to filter out large nickel powder particles in the inner electrode paste.

[0039] The filtration principle of filter 40 can be achieved using a mesh or small-pore metal or plastic screen to block large nickel powder particles from passing through. The filter size of filter 40 can be set as needed.

[0040] In the automatic slurry feeding device of this application embodiment, by setting a stirrer in the slurry storage tank, the stirrer mixes the different components such as nickel powder, resin, and organic solvent in the inner electrode slurry evenly, which can effectively suspend large particles of nickel powder and slow down their settling speed in the slurry storage tank; ensuring the uniformity of the inner electrode slurry; this application also sets a filter in the slurry feeding pipeline to block the passage of large particles of nickel powder, which enhances the consistency of the printed inner electrode slurry, reduces the risk of slurry agglomeration on the electrodes after MLCC product printing, and improves the quality of MLCC products.

[0041] To prevent filter 40 from clogging and affecting slurry supply, in one embodiment, such as Figure 1 As shown, a differential pressure sensor 50 is also installed between the inlet and outlet ends of the filter 40. The differential pressure sensor 50 is used to detect the pressure difference of the slurry at both ends of the filter 40. If the pressure difference is higher than a certain value, it indicates that the slurry supply pipe is blocked at the filter 40, and the filter 40 needs to be cleaned or replaced. Preferably, as Figure 1 As shown, both ends of the filter 40 are connected to the slurry filling pipe 30 via quick connectors 41.

[0042] In a specific example, to ensure the consistency of the internal electrode slurry, the maximum pore size of filter 40 is 0.6 μm.

[0043] like Figure 3-6 As shown, Figure 3 and Figure 4 This is a schematic diagram of the internal electrode paste before filtration and a printing effect diagram. Figure 5 and Figure 6 The diagram shows the filtered internal electrode paste and the printing effect. It can be seen that adding filter 40 significantly improves the consistency of the printed internal electrode pattern.

[0044] In one embodiment, such as Figure 1 As shown, the slurry storage tank 10 includes a tank body 11 and a top cover 12. The top cover 12 is placed on the tank body 11, and the slurry outlet 121 and the air inlet 122 are both located on the top cover 12. The agitator is a spiral agitator 20, which is installed on the top cover 12 and extends downward into the interior of the tank body 11.

[0045] like Figure 1 As shown, the spiral stirrer 20 is inserted into the slurry storage tank 10 from top to bottom. It has a vertical screw 21 and spiral blades 22 arranged around the screw 21 and extending upward at an angle. The spiral blades 22 are used to transport the inner electrode slurry below the slurry storage tank 10 to the top through rotational motion, so as to mix the different components such as nickel powder, resin, and organic solvent in the inner electrode slurry evenly and ensure the uniformity of the inner electrode slurry.

[0046] Compared to paddle mixers, the spiral mixer 20 used in this embodiment helps to produce a uniform mixing effect, reduces the generation of air bubbles in the internal electrode slurry, and can also effectively suspend large nickel powder particles, slowing down their settling speed in the slurry storage tank 10.

[0047] To reduce the driving force of the spiral blades 22 of the spiral agitator 20 in the slurry, reduce the turbulence generated in the inner electrode slurry during agitation, and reduce the bubbles generated in the inner electrode slurry due to agitation, preferably, the spiral blades 22 are spirally arranged upward at a uniform tilt angle, with the tilt angle between 15° and 30°.

[0048] To further reduce the turbulence generated in the internal electrode slurry during stirring and to minimize the air bubbles produced by stirring, preferably, as follows: Figure 2 As shown, the helical blade 22 includes an upper surface 221 and a lower surface 222, and the outer edges between the upper surface 221 and the lower surface 222 are connected to each other by a connecting part 223, which is rounded.

[0049] In this embodiment, the spiral blade adopts a smooth blade edge design to avoid serrated or overly sharp edges. The smooth edge formed by the connecting part 223 helps to reduce turbulence when the spiral blade 22 comes into contact with the inner electrode paste, reduce bubbles generated in the inner electrode paste, and improve printing quality.

[0050] More preferably, such as Figure 2 As shown, the maximum width of the connecting part 223 in the thickness direction of the spiral blade 22 is greater than the thickness of the spiral blade 22, thereby further reducing the turbulence when the spiral blade 22 comes into contact with the inner electrode slurry.

[0051] This application also provides a screen printing machine, including a printing mechanism and an automatic paste feeding device as described in the above embodiments, wherein the automatic paste feeding device is used to provide internal electrode paste to the printing mechanism.

[0052] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0053] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims, and the specification can be used to interpret the content of the claims.

Claims

1. An automatic slurry feeding device, characterized in that, include: The slurry storage tank is equipped with a slurry outlet and an air inlet at the top. A gas source pipeline, one end of which is connected to a gas source, and the other end of which is connected to the inside of the slurry storage tank through the air inlet; A stirrer is installed inside the slurry storage tank; The slurry filling pipe has one end extending into the slurry storage tank through the slurry outlet, and the other end used to deliver slurry to the printing mechanism; A filter, installed on the slurry supply pipe, is used to filter out large particles of nickel powder in the slurry.

2. The automatic slurry feeding device as described in claim 1, characterized in that: It also includes a differential pressure sensor, the two ends of which are connected to the inlet and outlet of the filter, respectively, for measuring the pressure difference of the slurry at both ends of the filter.

3. The automatic slurry feeding device as described in claim 2, characterized in that: Both ends of the filter are connected to the slurry filling pipe via quick connectors.

4. The automatic slurry feeding device as described in claim 1, characterized in that: The maximum pore size of the filter is 0.6 μm.

5. The automatic slurry feeding device as described in claim 1, characterized in that: The slurry storage tank includes a tank body and a top cover, the top cover being disposed on the tank body, and the slurry outlet and the air inlet being disposed on the top cover; The agitator is a spiral agitator, which is installed on the top cover and extends downward into the interior of the tank.

6. The automatic slurry feeding device as described in claim 5, characterized in that: The spiral blades of the spiral stirrer are spirally upward at a uniform angle, with the angle ranging from 15° to 30°.

7. The automatic slurry feeding device as described in claim 6, characterized in that: The helical blade includes an upper surface and a lower surface, and the outer edges between the upper and lower surfaces are connected to each other by a connecting part, which is rounded.

8. The automatic slurry feeding device as described in claim 7, characterized in that: The maximum width of the connecting portion in the thickness direction of the helical blade is greater than the thickness of the helical blade.

9. A screen printing machine, characterized in that: Includes the automatic slurry feeding device as described in any one of claims 1-8.

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