JP7227574B2 - Gravure roll, method for producing gravure roll, gravure printing apparatus, and method for producing laminated ceramic electronic component - Google Patents

Description

The present invention relates to a gravure roll having a HIP layer, a method for manufacturing a gravure roll having a HIP layer, a gravure printing apparatus equipped with a gravure roll having a HIP layer, and a laminated ceramic electronic component manufactured by the gravure roll having a HIP layer.

In recent years, gravure rolls have come to be used for printing wiring, electrodes, pixels, etc. of various electronic devices. For example, Japanese Patent Application Laid-Open No. 2013-180404 (Patent Document 1) describes such a gravure printing apparatus. A gravure printing apparatus for manufacturing a laminated ceramic electronic component will be described with reference to the drawings.

FIG. 5 is a schematic diagram of a gravure printing apparatus generally used at present for producing laminated ceramic electronic components. A gravure printing apparatus for manufacturing a laminated ceramic electronic component will be described with reference to FIG.

In the example shown in FIG. 5, the gravure roll 102 and impression cylinder 103 rotate in the directions of arrows 110a and 110b, respectively, thereby conveying the printed sheet 104 in the direction of arrow 110c.
A gravure printing apparatus 101 is used for manufacturing a laminated ceramic electronic component such as the laminated ceramic capacitor 113 shown in FIG. 7, for example.

The gravure roll 102 is immersed in a tank 108 supplied with a conductive paste 109 as a printing medium while rotating. While immersed in the conductive paste 109, the conductive paste 109a is immersed inside the gravure cells 106 formed on the gravure roll 102, and the gravure cells 106 are directed toward the impression cylinder 103 according to the rotating gravure roll 102. Become.

Excess conductive paste 109 exceeding the amount filling gravure cells 106 formed on the surface of gravure roll 102 is squeezed out by doctor blade 105 . Also, the conductive paste 109a filled in the gravure cell 106 is transferred to the printing sheet 104 at the point where the gravure roll 102 and the impression cylinder 103 come into contact.

The printed sheet 104 can be a sheet for manufacturing various electronic components to which the gravure printing method can be applied. A green sheet 111 can be used.

The printed sheet 104 is in a state in which a ceramic green sheet 111 is backed with a carrier film 112 as in the example shown in FIG. Then, as in the example shown in FIG. 6, a patterned conductive paste film 107 to be an internal electrode is formed on the ceramic green sheet 111 by gravure printing.

Next, a method for manufacturing a laminated ceramic electronic component will be described, which is disclosed in, for example, Japanese Patent Laying-Open No. 2004-303748 (Patent Document 2). FIG. 7 is an illustrative view showing a laminated ceramic capacitor as an example of a laminated ceramic electronic component. Multilayer ceramic capacitor 113 includes substrate 120 . The substrate 120 includes a plurality of dielectric ceramic layers 116, and internal electrodes 115a and 115b are formed between adjacent dielectric ceramic layers 116. As shown in FIG.

One end side of the one internal electrode 115a is drawn out to one side of the opposing ends of the substrate 120, and the other end side of the internal electrode 115a is formed to extend to the vicinity of the other side of the opposing ends of the substrate 120. be done. One end side of the other internal electrode 115b is drawn out to the other side of the opposite end of the base 120, and the other end of the internal electrode 115b extends to the vicinity of one side of the opposite end of the base 120. It is formed.

These internal electrodes 115 a and 115 b are alternately arranged in the thickness direction of the base 120 . Therefore, the internal electrodes 115a and 115b overlap each other inside the substrate 120, and the adjacent internal electrodes 115a and 115b are drawn out to the opposite end of the substrate 120. As shown in FIG. External electrodes 114a and 114b are formed at both ends of the substrate 120, and internal electrodes 115a and 115b are connected to the external electrodes 114a and 114b, respectively. Therefore, a capacitance is formed between the external electrodes 114a and 114b.

In order to produce the laminated ceramic capacitor 113 as shown in FIG. 7, the conductive paste layer 107 is printed on the ceramic green sheet 111 lined with the carrier film 112 to form the shape of the internal electrodes 115a and 115b. An electrode pattern is formed. A laminate is produced by laminating the ceramic green sheets 111 having electrode patterns in the shape of the internal electrodes 115a and 115b, and laminating ceramic green sheets without electrode patterns on both sides of the ceramic green sheets and pressing them together.

By cutting the obtained laminate, a chip is formed in which the electrode patterns in the shape of the internal electrodes 115a and 115b are alternately laminated. The resulting chip is barrel-polished, for example, to expose the lead-out portions of the internal electrodes 115a and 115b, and round the corners of the substrate 120 as necessary. A conductive paste is applied to the end portions of the base 120 where the internal electrodes 115a and 115b are exposed and sintered to form the external electrodes 114a and 114b.

Multilayer ceramic electronic components are manufactured in this way, but as can be understood from the manufacturing process, when the gravure printing method is used to manufacture the multilayer ceramic electronic components, the accuracy of the gravure cells formed on the gravure roll and the This means that the print quality of the conductive paste layer is greatly influenced by the shape retention. Therefore, the quality of the manufactured multilayer ceramic electronic component is also determined by the printing quality of the conductive paste layer.

In addition, the precision of the gravure cell as used in the present invention means, for example, the electrostatic capacity of the laminated ceramic capacitor, the viscosity of the conductive paste, the releasability of the conductive paste from the gravure cell, and the like. It refers to the optimum shape of the cell. Further, the shape retaining property of the gravure cell means that the shape of the gravure cell formed by optimum shape design is maintained as it is. Therefore, maintaining shape retention means that the shape of the gravure cell is continuously maintained as it is without being damaged or corroded over a long period of time.

The importance of the accuracy of the gravure cell is described, for example, in Japanese Patent Application Laid-Open No. 2012-131227 (Patent Document 3).
It states, "When printing internal electrode patterns for multilayer ceramic electronic components by gravure printing, not only uniformity of the internal electrode patterns over the entire printed surface but also microscopic uniformity inside each pattern is required. Therefore, in the manufacture of laminated ceramic electronic components, precise shape design of the gravure cell, which determines print quality, is very important."

Furthermore, "The presence or absence of print bleeding and the leveling characteristics of the surface of the printed pattern are determined by how the shape of the gravure cell is designed. The printed pattern is blurred, the leveling characteristics are poor, and the thickness is not uniform. In order to reduce the capacitance deviation and manufacture high-quality multilayer ceramic electronic components with high reliability, the precision of the gravure cells formed on the gravure roll must be improved. It is important to design a shape that realizes As a shape design of a gravure cell that can achieve the accuracy of the gravure cell, a gravure cell as shown in FIG. 8(a) has been invented.

In addition, for example, Japanese Patent Application Laid-Open No. 2010-105245 (Patent Document 4) states, "When the printed material is an electronic circuit or the like, when the conductive ink to be used has high viscosity (hard), a conventional gravure roll is used. When a thin line is formed by printing using a thin line, each dot may become discontinuous with an adjacent dot, and in such a case, defective products may occur.In contrast, low viscosity and fluidity If you use high-quality ink, each dot will be deformed and each dot will be continuous, but in this case, if you print very fine lines next to each other, there is a risk that the fine lines will be short-circuited." Are listed. As a shape design of a gravure cell that can achieve the precision of the gravure cell, a gravure cell related to manufacturing a laminated ceramic electronic component as shown in FIG. 8(b) has been invented.

As described above, the accuracy of the gravure cell can be improved by forming the gravure cell based on the precise shape design of the gravure cell. On the other hand, as a structure for maintaining the shape retention of the gravure cells, currently, there are generally a copper plating layer provided on the surface of the plate base material and having a large number of gravure cells formed on the surface, and the copper plating layer. A configuration of a chrome-plated layer covering the peripheral surface of the layer is often adopted.

The structure will be explained with reference to FIG. 9. A gravure cell for forming a conductive paste layer 107 that becomes the internal electrodes 115a and 115b of the multilayer ceramic electronic component is a plate mother, which is a hollow roll made of metal such as aluminum or iron. A plate-forming copper plating layer 118 is provided on the peripheral surface of the material 117, and a large number of gravure cells 106 are formed on this copper plating layer 118 by etching or electronic engraving in accordance with plate-making information. A chrome plating layer 119 is formed to improve the printing force.

Incidentally, recently, in place of or in addition to the chromium plating layer, there are many cases where a structure of a nickel alloy plating layer, a DLC (Diamond-Like Carbon) layer, or a cemented carbide layer is employed. Japanese Patent Laying-Open No. 2008-045206 (Patent Document 5) discloses a structure in which a nickel alloy plating layer is formed in place of the chromium plating layer.

JP 2013-180404 A Japanese Patent Application Laid-Open No. 2004-303748 JP 2012-131227 A JP 2010-105245 A JP 2008-045206 A

However, as an actual problem, a configuration is adopted in which a large number of gravure cells are formed on the currently used copper plating layer according to the plate making information, and then a chrome plating layer is formed to improve the printing durability of the gravure roll. Even if a nickel alloy plated layer, a DLC (Diamond-Like Carbon) layer, or a cemented carbide layer is used in place of or in addition to the chrome plated layer, the gravure cell is immediately damaged. The shape retention of the gravure cell is about 3 months, and therefore, there is a problem that the gravure roll must be replaced frequently.

Even if the accuracy of the gravure cell can be achieved by shape design, the shape retention of the gravure cell itself cannot be maintained continuously for a long period of time. The problem that the gravure roll must be frequently replaced has existed in the past and has not been solved until now.

At present, when IT technology is permeating all fields of society, the demand for laminated ceramic electronic components, which are basic components of IT technology, is increasing. In order to meet this demand, the high quality of multilayer ceramic electronic components and the precision and shape retention of the gravure cells required to achieve them, especially the long-term continuity of shape retention, were required. of.

In order to solve such problems, the gravure roll of the present invention is a gravure roll of a gravure printing machine for forming an internal electrode or a paste film, which is a part of a laminated structure of a laminated ceramic electronic component, on a sheet to be printed. A gravure roll is a hollow cylindrical plate base material made of chromium molybdenum steel or austenitic/ferritic stainless steel, and an alloy powder made of a nickel-based alloy or a cobalt-based alloy. and a HIP layer formed on at least the side surface of the plate base material, and the HIP layer is formed with gravure cells to which a conductive paste for forming the internal electrodes or the paste film is applied.

In this way, by forming the gravure cells directly on the HIP layer based on the gravure cell shape design that can achieve the accuracy of the gravure cells, the edges of the gravure cell shape are not damaged or corroded, and the conductivity is improved. The precision of the gravure cell, such as the releasability of the paste, can be maintained over a long period of time.

In addition, the method for manufacturing a gravure roll of the present invention comprises manufacturing a gravure roll comprising a metallic plate base material, a HIP layer formed on at least a side surface of the plate base material, and a gravure cell formed on the HIP layer. A method comprising steps of manufacturing a cylindrical plate base material member made of chromium molybdenum steel or austenitic/ferritic stainless steel, and alloy powder made of a nickel-based alloy or a cobalt-based alloy on a side surface of the plate base member. A HIP layer forming step of forming a HIP layer by hot isostatic pressing, and forming a cavity having a circular cross section in the plate base member in the axial direction and at both ends of the plate base member a plate base material forming step of forming a stepped portion for fixing the shaft portion of a gravure roll; a gravure cell forming step of forming gravure cells on the HIP layer according to plate making information by an etching method or an electronic engraving method; and a shaft portion fixing step of fixing the shaft portion of the gravure roll to step portions provided at both ends of the plate base material.

By adopting such a manufacturing process, the plate base material and the HIP layer can be integrated, and by limiting the fixing position of the shaft portion to the stepped portion of the plate base material, the weight of the gravure roll can be reduced. Even if the thickness of the HIP layer and the plate base material is changed as necessary for the purpose, the effect of the rotation of the plate base material through the shaft on the HIP layer is eliminated, and the gravure based on the plate making information formed on the HIP layer The precision of the cell can be stabilized.

Further, the gravure printing apparatus of the present invention is a gravure printing apparatus for forming patterned internal electrodes or paste films forming a part of a laminated structure provided in a laminated ceramic electronic component on a sheet to be printed by gravure printing. a gravure roll having, on its peripheral surface, a gravure cell to which a conductive paste that provides the internal electrode or the paste film is applied; The gravure roll hot isostatically applies an alloy powder made of a nickel-based alloy or a cobalt-based alloy to at least a side surface of a hollow cylindrical plate base material made of chromium molybdenum steel or austenitic/ferritic stainless steel. In preparation for the HIP layer formed by pressing, the gravure cell is formed on the HIP layer.

The accuracy of the gravure cell can be achieved by configuring the printing apparatus as described above. Since it can be maintained for a long period of time, the quality of the conductive paste layer printed on the sheet to be printed can be continuously maintained for a long period of time, and the manufacturing of the multilayer ceramic electronic component is stabilized.

Further, the multilayer ceramic electronic component of the present invention has a component body formed by alternately laminating a plurality of internal electrodes and ceramic layers, and external electrodes electrically connected to the internal electrodes of the substrate are provided at both ends of the substrate. In a laminated ceramic electronic component, a gravure roll is formed by applying an alloy powder made of a nickel-based alloy or a cobalt-based alloy to at least a side surface of a hollow columnar plate base material made of chromium molybdenum steel or austenitic/ferritic stainless steel. Equipped with a HIP layer formed by a lateral pressure treatment, a gravure cell for filling a conductive paste is formed on the surface of the HIP layer of the gravure roll, and an internal electrode or paste film is formed by printing with the gravure roll. characterized by becoming

With this structure, the precision and shape retention of the gravure cells formed in the HIP layer can be maintained for a long period of time. The quality of laminated ceramic electronic components is always guaranteed, and they can be manufactured continuously over a long period of time.

As described above, the present invention uses a gravure roll in which gravure cells are formed on the HIP layer provided on the side surface of the plate base material to print internal electrodes and paste films of multilayer ceramic electronic components. The precision and shape retention can be maintained for a long period of time, and therefore the internal electrodes and paste films, which are indispensable for the quality of the laminated ceramic electronic components, can always be produced in the best possible printing quality.

In addition, the HIP layer itself has remarkably superior durability and corrosion resistance compared to the conventional plating layer. As a result of the discovery, it became possible to achieve long-term continuity of the gravure roll, and it was possible to reduce the frequent replacement of the gravure roll, which had been a problem in the past.

1 is a schematic cross-sectional view of a gravure roll according to an example embodiment of the present invention; FIG. It is a front view showing roughly a gravure roll by an example of an embodiment of the present invention. It is a figure which represented typically the manufacturing process of the gravure roll by an example of embodiment of this invention. (a) Cross-sectional view schematically showing the state in which the HIP layer is formed on the plate base member (b) Cross-sectional view schematically showing the state in which the plate base member is hollowed (c) HIP layer (d) A cross-sectional view schematically showing a state in which the shaft portion is attached to the plate base material by fixing means. 1 is a cross-sectional view of gravure cells formed in a gravure roll according to an example embodiment of the present invention; FIG. (a) state in which the conductive paste is not filled; and (b) state in which the conductive paste is filled. 1 is a schematic front view of a gravure printing apparatus; FIG. 6 is a cross-sectional view showing a state in which a conductive paste layer is formed on a ceramic green sheet lined with a carrier film by the gravure printing apparatus shown in FIG. 5; FIG. 1 is an illustrative view showing a laminated ceramic capacitor as an example of a laminated ceramic electronic component; FIG. FIG. 10 is a diagram representing a cell pattern that achieves the precision of a gravure cell; 1 is a cross-sectional view of a conventional gravure cell showing a state in which a chromium plating layer is formed on a copper plating layer of a plate base material; FIG.

Concrete embodiments of the gravure roll of the present invention are shown in FIGS. Description will be made with reference to FIG.

FIG. 1 is a cross-sectional view schematically showing a gravure roll according to one example of an embodiment of the present invention. A gravure roll 1 has a HIP layer 3 formed on the side surface of a hollow columnar plate base material 2 . The HIP layer is provided with a large number of gravure cells 6 formed according to the platemaking information. It is configured such that the conductive paste layer can be printed only by the HIP layer provided with the gravure cell. Stepped portions 2a for fixing shaft portions 4 of gravure rolls by fixing means 5 are formed at both ends of a hollow columnar plate base material 2. As shown in FIG. FIG. 2 shows a schematic front view of the gravure roll.

A method of manufacturing the gravure roll shown in FIGS. 1 and 2 will be described with reference to FIG. FIG. 3 is a diagram schematically showing a manufacturing process of a gravure roll according to an example of an embodiment of the present invention.

In the first manufacturing process, the cylindrical plate base material member 12a is manufactured. Chromium-molybdenum steel or austenitic/ferritic stainless steel having a coefficient of thermal expansion close to that of nickel-based alloy powder or cobalt-based alloy powder used for the alloy powder of the HIP layer is preferable for the plate base material 12a. Chromium molybdenum steel, more preferably SCM440, is used from the viewpoint of workability into a hollow shape and economy.

In the next manufacturing process, the HIP layer 13a is formed by hot isostatic pressing of alloy powder made of a nickel-based alloy or a cobalt-based alloy on the side surface of the produced plate base material member 12a. The thickness of the HIP layer is generally about 3 mm. FIG. 3A shows the state at that stage.

The preferred nickel-based alloy powder used for the HIP layer 13a has a ratio of constituent elements of 69.75% by weight of nickel, 16.5% by weight of chromium, 3.3% by weight of boron, 4.0% by weight of silicon, and 0% of carbon. .65% by weight, 3.5% by weight iron, 3.0% by weight molybdenum and 2.3% by weight copper. Another preferred nickel-based alloy powder is 58.2 wt% nickel, 18.0 wt% chromium, 3.3 wt% boron, 3.7 wt% silicon, 0.8 wt% carbon, 1.5 wt% iron. , 2.5% by weight of molybdenum and 12.0% by weight of tungsten. Yet another preferred nickel-based alloy powder is 50.05 wt% nickel, 19.0 wt% chromium, 3.0 wt% boron, 3.1 wt% silicon, 0.85 wt% carbon, and 1.5 wt% iron. %, 2.5% by weight molybdenum and 20.0% by weight tungsten. In designing the alloy that forms the HIP layer, considering the fluorine contained in the conductive paste, which affects the corrosion resistance and wear resistance of the gravure cell, nickel-based alloy powder containing composite polylide is adopted. You may

On the other hand, the preferred cobalt-based alloy powder used for the HIP layer 13a has a ratio of constituent elements of 45.7% by weight of cobalt, 19.0% by weight of chromium, 15.0% by weight of tungsten, 1.3% by weight of copper, It consists of 13.0% by weight nickel, 3.0% by weight boron and 3.0% by weight silicon.

In the next manufacturing process, first, a cavity having a circular cross section is formed in the plate base material member 12a in the axial direction. Then, a plate base material 12b is manufactured in which stepped portions for fixing the shaft portions of the gravure rolls are formed at both ends of the plate base material member. FIG. 3B illustrates the state at this stage.

In the next manufacturing process, the HIP layer 13b is formed by forming a gravure cell on the HIP layer 13a according to platemaking information by etching or electronic engraving. FIG. 3(c) shows the state at this stage.

As a method for forming the gravure cells on the HIP layer 13a, the etching method and the electronic engraving method, which have conventionally been employed as methods for forming gravure cells on the copper plating layer, can be used as they are. Also, the size and depth of gravure cells to be formed in the HIP layer can be determined based on the shape design that realizes the precision of the gravure cells, and a special shape design is required for the HIP layer. isn't it.

In the next manufacturing process, the shaft portions 14a of the gravure roll are fixed by the fixing means 15 to the steps provided at both ends of the plate base material 12b. FIG. 3(d) illustrates the state at this stage. In terms of shape, the shaft portion 14a is inserted into the recesses provided at both ends of the plate base material 12b. shape is adopted.

A description will be given of the case where the internal electrodes of the laminated ceramic capacitor are printed using the gravure printing apparatus provided with the gravure roll having the HIP layer formed thereon according to the present invention. The gravure printing apparatus includes a gravure roll 1, an impression cylinder, a tank and a doctor blade.

The gravure roll 1 is immersed in a tank supplied with a conductive paste, which is a printing medium, while rotating. While immersed in the conductive paste, the gravure cells formed on the gravure roll 1 are soaked with the conductive paste, and the gravure cells 1 follow the rotating gravure roll toward the impression cylinder. Excess conductive paste exceeding the amount filling the gravure cells formed on the surface of the gravure roll 1 is squeezed out by a doctor blade. Also, the conductive paste filled in the gravure cells is transferred to the printing sheet at the point where the gravure roll 1 and the impression cylinder come into contact. A conductive paste film to be a patterned internal electrode for a multilayer ceramic capacitor is formed on the ceramic green sheet by gravure printing.

Features when using a gravure printing apparatus equipped with the gravure roll of the present invention will be described with reference to FIG. FIG. 4(a) shows a state in which the conductive paste is not filled, but as can be seen from this figure, only the HIP layer is formed on the side surface of the plate base material, and the printing quality is poor. It is a configuration in which the gravure cells based on the shape design that realizes the precision of the gravure cells that affect the surface are formed directly on the HIP layer. FIG. 4B shows a state in which the gravure cells of the HIP layer thus constructed are filled with the conductive paste. In this state, the HIP layer is formed such that the conductive paste filled in the gravure cells of the HIP layer is transferred and printed onto the ceramic green sheet of the printed sheet.

By configuring in this way, the HIP layer can maintain the shape of the gravure cell formed based on the shape design that realizes the precision of the gravure cell, which determines the printing quality, for a long period of time. can be used continuously over a long period of time, eliminating the need to frequently replace the gravure roll. Theoretically, if a gravure roll having a chromium plating layer on a copper plating layer needs to be replaced every three months, a gravure roll having a HIP layer does not need to be replaced for more than one year.

In the present embodiment, a method for manufacturing a multilayer ceramic capacitor has been described as an example, but the present invention can also be applied to methods for manufacturing ceramic electronic components such as multilayer varistors, multilayer coils, and multilayer substrates having a multilayer structure. be.

1 gravure roll 2 plate base material 2a step portion 3 HIP layer 4 shaft portion 5 fixing means 6 gravure cell 7 conductive paste 12a plate base material member 12b hollowed plate base material member 13a HIP layer 13b gravure cell is formed HIP layer 14a, shaft portion 15, fixing means 101, gravure printing device 102, gravure roll 103, impression cylinder 104, sheet to be printed 105, doctor blade 106, gravure cell 107, conductive paste layer 108, tank 109, conductive paste 109a, conductive paste 111, ceramic green sheet 112 Carrier film 113 Multilayer ceramic capacitor 114 External electrode 115 Internal electrode 116 Dielectric ceramic layer 117 Plate base material 118 Copper plating layer 119 Chrome plating layer 120 Substrate

Claims (4)

A gravure roll of a gravure printing machine for forming an internal electrode or a paste film that is part of a laminated structure of a multilayer ceramic electronic component on a sheet to be printed,
The gravure roll is made by subjecting a hollow columnar plate base material made of chromium molybdenum steel or austenitic/ferritic stainless steel and an alloy powder made of a nickel-based alloy or a cobalt-based alloy to hot isostatic pressing. and a HIP layer formed on at least the side surface of
A gravure roll, wherein the HIP layer is formed with gravure cells to which a conductive paste for forming an internal electrode or a paste film is applied. A method for manufacturing a gravure roll comprising a metallic plate base material, a HIP layer formed on at least a side surface of the plate base material, and a gravure cell formed on the HIP layer,
A process for manufacturing a cylindrical plate base material member made of chromium molybdenum steel or austenitic/ferritic stainless steel;
a HIP layer forming step of forming a HIP layer by subjecting an alloy powder made of a nickel-based alloy or a cobalt-based alloy to hot isostatic pressing on the side surface of the plate base member;
a plate base material forming step of axially forming a cavity having a circular cross section in the plate base member and forming stepped portions for fixing the shaft portions of the gravure rolls at both end portions of the plate base member; ,
a gravure cell forming step of forming a gravure cell on the HIP layer according to platemaking information by an etching method or an electronic engraving method;
and a step of fixing shafts of the gravure roll to stepped portions provided at both ends of the plate base material. A gravure printing apparatus for forming a patterned internal electrode or paste film forming a part of a laminated structure provided in a laminated ceramic electronic component on a sheet to be printed by gravure printing,
a gravure roll forming on its sides gravure cells to which a conductive paste is applied to provide internal electrodes or a paste film;
an impression cylinder facing the gravure roll with the sheet to be printed sandwiched therebetween;
In the gravure roll, an alloy powder made of a nickel-based alloy or a cobalt-based alloy is subjected to hot isostatic pressing on at least the side surface of a hollow cylindrical plate base material made of chromium molybdenum steel or austenitic/ferritic stainless steel. a HIP layer formed by
A gravure printing apparatus, wherein a gravure cell is formed on the HIP layer. 4. A method for producing a laminated ceramic electronic component, comprising forming a patterned internal electrode or paste film on the printed sheet by using the gravure printing apparatus according to claim 3.

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