JP4622513B2 - Ceramic paint supply method, multilayer ceramic electronic component manufacturing method, and ceramic paint supply apparatus - Google Patents

Description

  The present invention relates to a ceramic coating material supply method, a multilayer ceramic electronic component manufacturing method, and a ceramic coating material supply apparatus used for manufacturing a multilayer ceramic capacitor and the like.

  Conventionally, as a multilayer ceramic electronic component, for example, a multilayer ceramic capacitor that is widely applied to a mobile phone, a personal computer, or the like is known. Multilayer ceramic capacitors are extremely demanded for miniaturization and large capacity, and in order to meet these demands, the thickness of the dielectric layer per layer is reduced to increase the number of layers. For example, recent multilayer ceramic capacitors have a dielectric layer thickness of 1 to 10 μm or less and have reached several hundreds of layers.

  As a method for manufacturing such a multilayer ceramic capacitor, for example, a ceramic paint is applied on a sheet-like flexible support, and the ceramic paint is dried to form a ceramic green sheet. After forming the electrode group, the ceramic green sheets are cut to a predetermined size, and the cut ceramic green sheets are sequentially laminated to form a laminated structure, and the laminated structure is cut, fired, and terminals A manufacturing method is known in which an electrode is attached to obtain a finished multilayer ceramic capacitor.

  When forming ceramic green sheets by such a manufacturing method, in order to remove foreign matter mixed in the ceramic paint, the ceramic paint is filtered after the ceramic paint is filtered using a non-woven filter before the ceramic paint is applied. Is generally performed (see, for example, Patent Document 1).

JP-A-9-161268

  However, in such a known method for manufacturing a multilayer ceramic electronic component, the fibers of the nonwoven fabric filter fall off during the process of filtering the ceramic paint, and the fibers are caught in the paint discharge port to prevent the supply of the paint. There is a problem that streaks are generated on the surface of the ceramic green sheet and the flatness of the ceramic green sheet is lowered. In addition, when the fibers caught in the discharge port drop off and are applied, they adhere as foreign matter on the ceramic green sheet, so that foreign matter is present at the end of the stripe.

  The present invention has been made in order to solve such problems, and is capable of preventing the generation of streaks on the surface of the ceramic green sheet and improving the flatness of the ceramic green sheet. It is an object of the present invention to provide a method, a method for manufacturing a multilayer ceramic electronic component, and a ceramic paint supply apparatus.

  As a result of earnest research, the inventor of the present invention has prevented the generation of streaks on the surface of the ceramic green sheet and can improve the flatness of the ceramic green sheet, and a method for manufacturing a multilayer ceramic electronic component And a ceramic paint supply device.

  That is, the above-described object can be achieved by the following present invention.

(1) A step of filtering a ceramic paint with a first filter having a nonwoven fabric as a filter structure and having an average diameter of 3 μm to 5 μm, and an average diameter of the first filter with the ceramic paint filtered by the first filter have an average diameter of greater 5μm~100μm than possible collection of fibers having a length of about 10 m - 100 m, and the first rather small, falling off of the filter arrangement of the filter, the first filter And a step of filtering with a second filter arranged in a subsequent stage .

( 2 ) Each step in the ceramic coating material supply method according to (1 ), and a step of applying the ceramic coating material on the support so that the coating thickness after drying is 0.3 μm to 5 μm. A method for producing a monolithic ceramic electronic component comprising:

( 3 ) comprising a non-woven fabric as a filter structure, a first filter having an average diameter of 3 μm to 5 μm, and a second filter disposed downstream of the first filter, wherein the second filter is It has an average aperture of 5 μm to 100 μm that is larger than the average aperture of the first filter, can collect fibers having a length of about 10 μm to 100 μm , and can drop the filter components more than the first filter. Ceramic paint supply device characterized by few.

  According to the ceramic coating material supply method, the multilayer ceramic electronic component manufacturing method, and the ceramic coating material supply device according to the present invention, it is possible to prevent the generation of streaks on the surface of the ceramic green sheet and improve the flatness of the ceramic green sheet. It has an excellent effect of being able to.

The ceramic paint supply method according to the present invention includes a step of filtering a ceramic paint with a first filter having a nonwoven fabric as a filter structure and having an average diameter of 3 μm to 5 μm, and the ceramic paint filtered with the first filter. It has an average aperture of 5 μm to 100 μm that is larger than the average aperture of the first filter, can collect fibers having a length of about 10 μm to 100 μm , and can drop the filter components more than the first filter. least for the step of filtering by the second filter arranged downstream of said first filter, by comprising, to prevent the streaks are generated on the surface of the ceramic green sheet, the flatness of the ceramic green sheet It is a thing that raised.

The ceramic paint supply apparatus according to the present invention includes a first filter having an average diameter of 3 μm to 5 μm and a second filter disposed downstream of the first filter, including a nonwoven fabric as a filter structure . The second filter has an average aperture of 5 μm to 100 μm larger than the average aperture of the first filter, and can collect fibers having a length of about 10 μm to 100 μm , and the first filter The problem similar to the above is solved by the fact that the filter component is less dropped than the filter.

  The “ceramic paint” according to the present invention refers to a paint containing ceramic powder as a main component.

  Hereinafter, a ceramic paint supply method, a multilayer ceramic electronic component manufacturing method, and a ceramic paint supply apparatus according to an embodiment of the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 1, the method for manufacturing a multilayer ceramic electronic component according to the present embodiment includes a ceramic coating layer generation step S10, an electrode group formation step S11, a ceramic green sheet cutting step S12, and a ceramic green sheet. And laminating step S13.

  In the ceramic coating layer generation step S10, the ceramic coating material supply device 10, the support 12 and the dryer 14 are used.

  As shown in FIG. 2, the ceramic paint supply apparatus 10 performs tank 18 for storing the ceramic paint 16, a pump 20 for delivering the ceramic paint 16 from the tank 18, and filtration of the ceramic paint 16. The first filter 24, the second filter 26 disposed downstream of the first filter 24, and a head 27 for applying the ceramic paint 16 are configured.

  For the first filter 24, for example, a filter including a nonwoven fabric such as polypropylene, polyester, nylon, or the like as a filter component can be applied. In order to surely remove the foreign matter mixed in the ceramic paint 16, the average diameter of the first filter 24 is preferably about 3 μm to 5 μm.

  On the other hand, the second filter 26 disposed in the subsequent stage of the first filter 24 is a filter in which the filter components are less dropped than the first filter 24. The second filter 26 includes, for example, sintered metal, A filter including foamed plastic, a metal slit, or the like as a filter component can be applied, and the second filter 26 may be configured by stacking a plurality of filter components 26A and 26B. Further, the second filter 26 has an average aperture larger than the average aperture of the first filter 24, and the average aperture is preferably about 5 μm to 100 μm.

  Generally, when applying a multi-stage filter, it is usual to apply a filter having a smaller average aperture (finer) than the filter of the previous stage as the latter filter, but in the ceramic paint supply device 10 according to the present embodiment, In order to collect the fibers and the like that have fallen off from the first filter 24 by the second filter 26, the average aperture of the second filter 26 that is the subsequent stage is set larger than the average aperture of the first filter 24 that is the preceding stage. Thereby, for example, fibers such as polypropylene, polyester, and nylon having a length of about 10 μm to 100 μm can be efficiently collected by the second filter 26.

Returning to FIG. 1, in the ceramic coating layer generation step S <b> 10, the ceramic coating 16 supplied from the ceramic coating supply apparatus 10 is applied onto one surface of the support 12, and the ceramic coating 16 is passed through the dryer 14 and dried. The ceramic coating layer 28 having a coating thickness after drying of 0.3 μm to 5 μm is formed. As a material of the ceramic paint 16, for example, a material such as BaTiO ₃ can be applied.

  In the electrode group forming step S <b> 11, the electrode group 29 is printed on the surface of the ceramic coating layer 28 using the screen printer 30, and then dried through the dryer 14 to form the electrode group 29.

  In the ceramic green sheet cutting step S12, the ceramic coating layer 28 on which the electrode group 29 is formed is cut into a predetermined dimension by using the cutting blade 36 to generate a ceramic green sheet 38 having a predetermined length.

  In the ceramic green sheet laminating step S13, the ceramic green sheets 38 are peeled off from the support 12 and the ceramic green sheets 38 are sequentially laminated. Thereafter, ceramic electronic components are generated through processes such as hot pressing and cutting.

  The inventor of the present invention uses the ceramic paint supply device 10 according to the present embodiment and a conventional ceramic paint supply device that does not include the second filter 26 to determine the number of streaks generated on the surface of the ceramic green sheet. A comparison was made. The experimental results are shown in Table 1.

  In this experiment, a nonwoven fabric filter having an average diameter of 4 μm was applied as the first filter 24, and a wire mesh having an average diameter of 25 μm was applied as the second filter 26. Moreover, about the ceramic coating material supply apparatus 10 based on a present Example, the 1st filter 24 was wash | cleaned before experiment.

  As a result of the experiment, as shown in Table 1, in the conventional ceramic paint supply device, the coating length is 0 to 200 m, 22 pieces, 201 m to 400 m, 9 pieces, 401 m to 600 m, 5 pieces, 601 m to 800 m, 4 pieces. Each streak was detected. On the other hand, in the ceramic coating material supply apparatus 10 according to the example, no streak was detected in the entire range of the coating length of 0 to 1600 m, and good results were obtained.

  According to the ceramic coating material supply method and the multilayer ceramic electronic component manufacturing method according to the present embodiment, the step of filtering the ceramic coating material 16 by the first filter 24 and the ceramic coating material 16 filtered by the first filter 24 are first processed. And the step of filtering with a second filter 26 having an average aperture larger than the average aperture of the filter 24 and having less filter components falling off than the first filter 24. It is possible to prevent the generation of streaks and to improve the flatness of the ceramic green sheet.

  Moreover, since the manufacturing method of the multilayer ceramic electronic component which concerns on a present Example includes the process of apply | coating the ceramic coating material 16 on a support body so that the coating-film thickness after drying may be set to 0.3 micrometer-5 micrometers. A thin ceramic green sheet can be formed without reducing the flatness.

  Moreover, according to the coating material supply apparatus 10 which concerns on a present Example, it comprises the 1st filter 24 and the 2nd filter 26 arrange | positioned in the back | latter stage of this 1st filter 24. Since the filter has a mean diameter larger than the mean diameter of the first filter 24 and the filter component is less dropped than the first filter 24, the surface of the ceramic green sheet can be prevented from generating streaks. The flatness of the sheet can be improved.

  Furthermore, since the average diameter of the second filter 26 is 5 μm to 100 μm, fibers such as polypropylene, polyester, and nylon having a length of about 10 μm to 100 μm that have fallen off from the first filter 24 can be reliably collected.

  In addition, since the 2nd filter 26 is comprised by laminating | stacking two filter components 26A and 26B, the effect of filtration can be improved further.

  In addition, the manufacturing method of the multilayer ceramic electronic component which concerns on this invention is not limited to the manufacturing method which concerns on a present Example, For example, you may be comprised including another manufacturing process.

  The ceramic paint supply device according to the present invention is not limited to the configuration of the ceramic paint supply device 10 according to the present embodiment. For example, the average diameters of the first filter 24 and the second filter 26 are the above numerical values. It is not limited to. The same applies to the coating thickness of the ceramic paint 16 after drying.

  Further, the second filter 26 may be composed of a single filter component, or may be configured by laminating three or more filter components.

  The ceramic coating material supply method, the multilayer ceramic electronic component manufacturing method, and the ceramic coating material supply apparatus according to the present invention can be applied to the manufacture of multilayer ceramic electronic components such as multilayer ceramic capacitors.

Process drawing which shows the process of the manufacturing method of the multilayer ceramic electronic component which concerns on a present Example Block diagram of a ceramic paint supply apparatus according to this embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Ceramic paint supply apparatus 12 ... Support body 14 ... Dryer 16 ... Ceramic paint 18 ... Tank 20 ... Pump 24 ... 1st filter 26 ... 2nd filter 27 ... Head 28 ... Ceramic paint layer 29 ... Electrode group 30 ... Screen printing Machine 36 ... Cutting blade 38 ... Ceramic green sheet

Claims (3)

The step of filtering the ceramic paint with a first filter having a nonwoven fabric as a filter structure and having an average diameter of 3 μm to 5 μm, and the ceramic paint filtered with the first filter being larger than the average diameter of the first filter have an average diameter of 5 m to 100 m, it can collect the fibers having a length of about 10 m - 100 m, and, fall off rather less of the filter arrangement than the first filter, downstream of the first filter And a step of filtering with a second filter arranged . Each step in the ceramic coating material supply method according to claim 1, and a step of applying the ceramic coating material on a support so that the coating thickness after drying is 0.3 μm to 5 μm. A method for producing a multilayer ceramic electronic component. A non-woven fabric is included as a filter structure, and includes a first filter having an average diameter of 3 μm to 5 μm, and a second filter disposed downstream of the first filter, wherein the second filter includes the first filter It has an average aperture of 5 μm to 100 μm that is larger than the average aperture of the filter, can collect fibers having a length of about 10 μm to 100 μm , and has less dropout of filter components than the first filter. Characteristic ceramic paint supply device.

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