Gravure printing roll, gravure printing device, and method for producing laminated ceramic capacitor

Abstract

A gravure printing plate roller (100) having cells having a shape corresponding to a pattern to be printed formed on the outer peripheral surface thereof comprises: a transmission shaft (3) which is rotated by a driving force; an inner roller (1) which is arranged radially outside the transmission shaft; and a metal thin-walled sleeve (2) which is arranged radially outside the inner roller (1) in a state separated from the inner roller and has cells (21) formed on the surface thereof. An elastic member (12) is provided at a portion of the inner roller (1) which is opposite to the metal thin-walled sleeve (2), and the metal thin-walled sleeve (2) is configured to abut against the elastic member (12) of the inner roller (1) during printing.

Description

Technical Field

[0001] The present invention relates to a gravure printing roll, a gravure printing device including the gravure printing roll, and a method for producing a laminated ceramic capacitor using the gravure printing device. Background Art

[0002] There is known a gravure printing apparatus that performs printing by sandwiching a printing object between a plate roller and a drum roller and transferring ink filled in cells of the plate roller to the printing object.

[0003] As one of such gravure printing devices, the following gravure printing device is described in Patent Document 1, that is, in a state where the cells of the plurality of plate rollers store inks of different colors, the plurality of plate rollers are rotated respectively, and a drum-type roller is rotated at the same time, thereby performing multi-color gravure printing on a printing object. In the gravure printing device, the plate roller comprises: a plate base material having a buffer layer containing rubber or a buffering resin provided on the surface; a photosensitive composition layer formed on the surface of the buffer layer; and cells formed on the surface of the photosensitive composition layer.

[0004] Prior Art Literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2009-96189 Summary of the invention

[0007] Problem that the invention aims to solve

[0008] However, the plate roller described in Patent Document 1 forms cells on the surface of the flexible photosensitive composition layer, and therefore the cells cannot be formed with high precision, and there is a possibility that printing precision may be reduced.

[0009] Furthermore, when the excess ink adhering to the surface of the plate roller is scraped off by a scraper, the surface is abraded, the depth of the concave portions forming the cells becomes shallow, and there is a possibility that the printing accuracy is reduced.

[0010] An object of the present invention is to solve the above-mentioned problems and to provide a gravure printing roll capable of improving printing accuracy, a gravure printing apparatus including such a gravure printing roll, and a method for manufacturing a laminated ceramic capacitor using the gravure printing apparatus.

[0011] Technical solutions to solve problems

[0012] The gravure printing plate roller of the present invention has cells having a shape corresponding to a pattern to be printed formed on the outer peripheral surface, and the gravure printing plate roller is characterized in that:

[0013] have:

[0014] The transmission shaft is rotated by the driving force;

[0015] an inner roller disposed radially outwardly of the transmission shaft; and

[0016] A metal thin-walled sleeve is disposed on the radially outer side of the inner roller in a state separated from the inner roller, and has the cells formed on its surface.

[0017] An elastic member is provided at a portion of the inner roller that is opposite to the metal thin-walled sleeve.

[0018] The thin-walled metal sleeve is configured to come into contact with the elastic member of the inner roller during printing.

[0019] The pressure in the space between the inner roller and the metal thin-walled sleeve may also be higher than atmospheric pressure.

[0020] The transmission shaft may also be provided with an opening, wherein the opening is used to introduce gas into the space between the inner roller and the thin-walled sleeve.

[0021] The distance between the inner roller and the thin-walled metal sleeve in the radial direction may be greater than or equal to 0 mm and less than or equal to 0.25 mm.

[0022] The metal thin-walled sleeve may also contain Ni.

[0023] The elastic member may also be NBR.

[0024] The Young's modulus of the elastic member may be 0.1 GPa or less.

[0025] The gravure printing plate roller may further include a holding member that holds the thin-walled metal sleeve provided separately from the inner roller.

[0026] The holding member may be a flange provided on the transmission shaft on the outer side of the inner roller in the rotation axis direction.

[0027] The gravure printing device of the present invention is characterized by comprising:

[0028] Any of the above-mentioned gravure printing rolls; and

[0029] The drum roller sandwiches the printing object between the drum roller and the gravure printing plate roller.

[0030] The method for manufacturing a multilayer ceramic capacitor of the present invention is characterized by comprising:

[0031] A step of forming an internal electrode pattern on a ceramic green sheet using the gravure printing device;

[0032] A step of manufacturing a laminated body by laminating a plurality of the ceramic green sheets including the ceramic green sheet on which the internal electrode pattern is formed;

[0033] a step of firing the laminate; and

[0034] A step of providing external electrodes on the fired laminate.

[0035] Effects of the Invention

[0036] According to the gravure printing roll of the present invention, since cells are formed on the thin metal sleeve, cells can be formed with higher precision than in a structure in which cells are formed on a flexible material, thereby improving printing precision during printing.

[0037] Furthermore, even when the excess ink adhering to the surface of the plate roller is scraped off by a scraper, since a metal thin-walled sleeve is provided on the surface of the plate roller, the occurrence of wear can be suppressed, thereby improving the printing accuracy during gravure printing.

[0038] In addition, in the gravure printing plate roller of the present invention, an inner roller is provided separately from the metal thin-walled sleeve, and an elastic member is provided at a portion of the inner roller that is opposite to the metal thin-walled sleeve. Furthermore, the metal thin-walled sleeve is configured to abut against the elastic member of the inner roller during printing. According to such a structure, since the elastic member functions as a cushion abutting against the metal thin-walled sleeve during printing, printing on the printing object can be reliably performed, and printing accuracy can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a perspective view schematically showing the appearance of a gravure printing plate roller in one embodiment.

[0040] Figure 2 yes Figure 1 A cross-sectional view of the gravure printing plate roller taken along line II-II is shown.

[0041] Figure 3 It is a figure for demonstrating the dimension of each part in the radial direction of the gravure printing plate cylinder.

[0042] Figure 4 It is a diagram schematically showing the structure near the boundary between the inner roller and the holding member.

[0043] Figure 5 This is a diagram for explaining the behavior of the gravure printing plate roller when the drum roller comes into contact with the printing object.

[0044] Figure 6 This is a diagram showing the configuration of a main part of a gravure printing apparatus including a gravure printing plate roller.

[0045] Figure 7 This is a flowchart for explaining a method for manufacturing a multilayer ceramic capacitor. DETAILED DESCRIPTION

[0046] Embodiments of the present invention are shown below, and features of the present invention are described in detail.

[0047] (Gravure printing roller)

[0048] First, the structure of the gravure printing plate roller used in the gravure printing apparatus will be described.

[0049] Figure 1 1 is a perspective view schematically showing the appearance of a gravure printing plate roller 10 in one embodiment. Figure 2 yes Figure 1 The cross-sectional view of the gravure printing plate cylinder 10 taken along the II-II line is shown.

[0050] Cells 21 having a shape corresponding to a pattern to be printed are formed on the outer peripheral surface of the gravure printing plate roller 10 .

[0051] The gravure printing plate roller 10 includes an inner roller 1 , a metal thin-walled sleeve 2 , a transmission shaft 3 , and a holding member 4 .

[0052] The inner roller 1 is provided radially outside the transmission shaft 3 described later, and includes a roller body 11 and an elastic member 12 provided on the surface of the roller body 11 and at a portion facing the metal thin-walled sleeve 2. The roller body 11 is made of, for example, stainless steel. The Young's modulus of the roller body 11 is, for example, 50 GPa or more.

[0053] The elastic member 12 is, for example, NBR (nitrile rubber). However, the elastic member 12 is not limited to NBR, and may be silicone rubber, EPDM (ethylene propylene rubber), etc. The Young's modulus of the elastic member 12 is, for example, 0.1 GPa or less.

[0054] The metal thin-walled sleeve 2 is arranged radially outside the inner roller 1 in a state separated from the inner roller 1. The dimension of the metal thin-walled sleeve 2 in the rotation axis direction L is, for example, 600 mm. The metal thin-walled sleeve 2 contains metal, for example, Ni. As an example, the metal thin-walled sleeve 2 contains Cu and Ni plating is applied on the surface.

[0055] Cells 21 are formed on the outer peripheral surface of the metal thin-walled sleeve 2. The cells 21 can be formed by known methods such as laser engraving and engraving using a diamond needle. Since the metal thin-walled sleeve 2 contains metal, the cells can be formed with better accuracy than a structure in which cells are formed on a flexible raw material, thereby improving the printing accuracy during printing.

[0056] The thin-walled metal sleeve 2 is configured to abut against the elastic member 12 of the inner roller 1 during printing. Details of the configuration in which the thin-walled metal sleeve 2 abuts against the elastic member 12 of the inner roller 1 during printing will be described later.

[0057] The central axis of the cylindrical inner roller 1, the central axis of the metal thin-walled sleeve 2, and the central axis (rotation axis) of the transmission shaft 3 are all aligned.

[0058] Figure 3 This is a diagram for explaining the dimensions of each part of the gravure printing plate roller 10 in the radial direction R. The thickness T1 of the metal thin-walled sleeve 2, that is, the dimension in the radial direction R, is, for example, 0.05 mm or more and 0.20 mm or less. In addition, the depth D1 of the cells 21 formed in the metal thin-walled sleeve 2, that is, the dimension in the radial direction R, is, for example, 5 μm or more and 30 μm or less.

[0059] As described above, the metal thin-walled sleeve 2 is provided in a state separated from the inner roller 1. That is, there is a space 40 between the inner roller 1 and the metal thin-walled sleeve 2. The distance L1 between the inner roller 1 and the metal thin-walled sleeve 2 in the radial direction R is, for example, 0.05 mm or more and 0.25 mm or less. In addition, the thickness T2 of the elastic member 12 of the inner roller 1, that is, the dimension in the radial direction R, is, for example, 5 mm or more and 20 mm or less.

[0060] The holding member 4 holds the metal thin-walled sleeve 2 provided separately from the inner roller 1. The holding member 4 is, for example, a flange provided on the transmission shaft 3 outside the inner roller 1 in the rotation axis direction L and provided to protrude outward in the radial direction R relative to the transmission shaft 3.

[0061] In this embodiment, if Figure 4 As shown, the holding member 4 includes a member main body 4 a and an elastic body 4 b that abuts against the metal thin-walled sleeve 2 .

[0062] The transmission shaft 3 is arranged radially inward of the inner roller 1 and the metal thin-walled sleeve 2, and rotated by a driving force of a motor or the like. The transmission shaft 3 is made of metal, for example. The above-mentioned metal thin-walled sleeve 2 is configured to be able to rotate integrally with the transmission shaft 3 via a retaining member 4. On the other hand, the inner roller 1 in this embodiment is configured not to rotate integrally with the transmission shaft 3.

[0063] The transmission shaft 3 is provided with an opening 3a, which is used to feed gas into the space 40 between the inner roller 1 and the metal thin-walled sleeve 2. Figure 2 As shown, an opening 3a is provided at one end of the transmission shaft 3 in the direction of the rotation axis L. The gas introduced into the space 40 between the inner roller 1 and the metal thin-walled sleeve 2 is, for example, air. Figure 4As shown, the gas flows into the space 40 between the inner roller 1 and the metal thin-walled sleeve 2 through the vent hole 3b provided in the transmission shaft 3, the space 41 between the roller body 11 of the inner roller 1 and the transmission shaft 3, and the space 42 between the inner roller 1 and the retaining member 4. Therefore, the elastic member 12 provided on the surface of the inner roller 1 is not provided with a through hole for allowing the gas to flow into the space 40 between the inner roller 1 and the metal thin-walled sleeve 2.

[0064] The pressure of the space 40 between the inner roller 1 and the metal thin-walled sleeve 2 is preferably higher than the atmospheric pressure. Since the pressure of the space 40 between the inner roller 1 and the metal thin-walled sleeve 2 is higher than the atmospheric pressure, even if the gravure printing plate roller 10 is not processed to form a conical crown shape, the center of the metal thin-walled sleeve 2 in the rotation axis direction L bulges outward in the radial direction R compared to the end. Therefore, during printing, the printing object and the gravure printing plate roller 10 can be reliably abutted, so the printing accuracy can be improved.

[0065] Furthermore, since the pressure in the space 40 between the inner roller 1 and the metal thin-walled sleeve 2 is higher than the atmospheric pressure, when the gravure printing plate roller 10 contacts the drum-type roller via the printing object during printing, the metal thin-walled sleeve 2 provided on the surface of the gravure printing plate roller 10 can be suppressed from bending inwardly in the radial direction R. Thus, the printing object can be reliably clamped between the gravure printing plate roller 10 and the drum-type roller, and the printing accuracy can be improved.

[0066] In addition, if the pressure of the space 40 becomes too high, the sealing member for maintaining the space 40 may be damaged. Therefore, the pressure of the space 40 is preferably set to be higher than the atmospheric pressure and below a given upper limit pressure. The given upper limit pressure is, for example, 0.3 MPa. However, the pressure of the space 40 may also be the same as the atmospheric pressure.

[0067] Here, using Figure 5 The following describes the details of the structure in which the metal thin-walled sleeve 2 contacts the elastic member 12 of the inner roller 1 during printing. When the drum roller contacts the gravure printing plate roller 10 via the printing object, the metal thin-walled sleeve 2 provided on the surface of the gravure printing plate roller 10 is pressed inward in the radial direction R. As a result, Figure 5 As shown, the elastic body 4 b of the holding member 4 holding the thin-walled metal sleeve 2 is deformed to contract inward in the radial direction R, and the thin-walled metal sleeve 2 comes into contact with the elastic member 12 of the inner roller 1 .

[0068] In this case, the elastic member 12 of the inner roller 1 that is in contact with the thin-walled metal sleeve 2 functions as a cushion, so that printing on the printing object can be reliably performed, and the printing accuracy can be improved.

[0069] (Gravure printing device)

[0070] Figure 6 1 is a diagram showing the configuration of a main part of a gravure printing apparatus 100 including the gravure printing plate cylinder 10 described above. The gravure printing apparatus 100 includes the gravure printing plate cylinder 10 and a drum roller 50 sandwiching a printing object 51 with the gravure printing plate cylinder 10 .

[0071] like Figure 6 As shown, during printing, the printing object 51 is sandwiched between the gravure printing plate roller 10 and the drum roller 50, and the gravure printing plate roller 10 and the drum roller 50 are respectively driven to rotate, so that the ink filled in the cells 21 of the gravure printing plate roller 10 is transferred to the printing object 51. As an example, the ink tank 52 stores ink 53, and the surface of the gravure printing plate roller 10 contacts the ink 53, so that after the cells 21 are filled with ink, they are transferred to the printing object 51. In addition, the gravure printing plate roller 10 is pressed by a pusher (pusher) as a pressing member so that it does not separate from the drum roller 50.

[0072] like Figure 6 As shown, the gravure printing device 100 may also include a scraper 54 for scraping off excess ink attached to the surface of the gravure printing plate roller 10. As described above, the metal thin-walled sleeve 2 is provided on the surface of the gravure printing plate roller 10, so that it is possible to suppress wear when the scraper 54 scrapes off excess ink. As a result, the printing accuracy during gravure printing can be improved.

[0073] Here, the printing object 51 is, for example, a ceramic green sheet formed on a carrier film. In addition, the ink filled in the cells 21 of the gravure printing plate roller 10 is, for example, a conductive paste for forming an internal electrode pattern. Therefore, by printing using the above method, a ceramic green sheet with an internal electrode pattern formed thereon can be obtained. The ceramic green sheet with an internal electrode pattern formed thereon is used, for example, in the manufacture of a laminated ceramic capacitor as a laminated ceramic electronic component.

[0074] (Method for Manufacturing Multilayer Ceramic Capacitor)

[0075] Figure 7 This is a flowchart for explaining a method for manufacturing a multilayer ceramic capacitor.

[0076] In step S1, a plurality of ceramic green sheets are prepared. As the ceramic green sheets, known ceramic green sheets can be used.

[0077] In step S2 following step S1, an internal electrode pattern is formed on a specific ceramic green sheet among the plurality of ceramic green sheets using the gravure printing device 100. That is, the internal electrode conductive paste is printed on the ceramic green sheet using the gravure printing device 100 to form the internal electrode pattern.

[0078] In step S3 following step S2, a laminate is produced by laminating a plurality of ceramic green sheets including a ceramic green sheet on which an internal electrode pattern is formed. Specifically, a predetermined number of ceramic green sheets on which an internal electrode pattern is not formed are laminated, ceramic green sheets on which an internal electrode pattern is formed are sequentially laminated, and a predetermined number of ceramic green sheets on which an internal electrode pattern is not formed are laminated, thereby producing the laminate. This laminate is an unfired mother laminate.

[0079] In step S4 subsequent to step S3, after the laminate is pressed, it is separated into small pieces by various methods such as cutting and press cutting.

[0080] In step S5 following step S4, the individualized small pieces are fired to produce a ceramic laminate. The firing temperature depends on the materials of the ceramic layer and the internal electrode, but is, for example, 900° C. to 1300° C. Then, the corners and ridges of the ceramic laminate are rounded by barrel grinding or the like.

[0081] In step S6 subsequent to step S5, external electrodes are formed on both end surfaces of the ceramic laminate.

[0082] By the above-described method, a multilayer ceramic capacitor as a multilayer ceramic electronic component can be produced.

[0083] The present invention is not limited to the above-described embodiments, and various applications and modifications are possible within the scope of the present invention.

[0084] In the above-mentioned embodiment, the transmission shaft 3 is provided with the opening 3a for feeding gas into the space 40 between the inner roller 1 and the metal thin-walled sleeve 2, but the opening for feeding gas into the above-mentioned space 40 may be provided in the holding member 4. In the case where the transmission shaft 3 is provided with the opening 3a, there is an advantage that gas can be fed all the time during printing. On the other hand, in the case where the holding member 4 is provided with the opening, there is an advantage that the structure can be simplified compared with the case where the opening 3a is provided in the transmission shaft 3.

[0085] In the above-mentioned embodiment, the space 40 is provided between the inner roller 1 and the thin-walled metal sleeve 2, but it is also possible to have a structure in which the space 40 does not exist. In this case, the thin-walled metal sleeve 2 is structured so as to abut against the elastic member 12 of the inner roller 1 not only during printing but also during times other than printing. If a structure in which the space 40 does not exist is also considered, the distance L1 between the inner roller 1 and the thin-walled metal sleeve 2 in the radial direction R is preferably not less than 0 mm and not more than 0.25 mm.

[0086] Description of Reference Numerals

[0087] 1: Inner roller;

[0088] 2: Metal thin-walled sleeve;

[0089] 3: Transmission shaft;

[0090] 3a: Opening of the transmission shaft;

[0091] 4: Maintain components;

[0092] 4a: main body of the component;

[0093] 4b: Elastomer;

[0094] 10: Plate roller for gravure printing;

[0095] 11: roller body;

[0096] 12: elastic member;

[0097] 21: web cave;

[0098] 40: space between the inner roller and the thin-walled sleeve;

[0099] 50: drum roller;

[0100] 51: Printing object;

[0101] 52: ink tank;

[0102] 53: ink;

[0103] 54: scraper;

[0104] 100: Gravure printing device.

Claims

1. A gravure printing plate roller, wherein cells having a shape corresponding to a pattern to be printed are formed on the outer peripheral surface, wherein the gravure printing plate roller is characterized in that: have: The transmission shaft is rotated by the driving force; an inner roller disposed radially outwardly of the transmission shaft; and A metal thin-walled sleeve is disposed on the radially outer side of the inner roller in a state separated from the inner roller, and has the cells formed on its surface. An elastic member is provided at a portion of the inner roller that is opposite to the metal thin-walled sleeve. The thin-walled metal sleeve is configured to come into contact with the elastic member of the inner roller during printing.

2. The gravure printing roll according to claim 1, It is characterized in that The pressure of the space between the inner roller and the metal thin-walled sleeve is higher than the atmospheric pressure.

3. The gravure printing roll according to claim 2, It is characterized in that The transmission shaft is provided with an opening, and the opening is used to feed gas into the space between the inner roller and the metal thin-wall sleeve.

4. The gravure printing roll according to any one of claims 1 to 3, It is characterized in that The distance between the inner roller and the thin-walled metal sleeve in the radial direction is 0.25 mm or less.

5. The gravure printing roll according to any one of claims 1 to 3, It is characterized in that The metal thin-walled sleeve contains Ni.

6. The gravure printing roll according to any one of claims 1 to 3, It is characterized in that The elastic member is NBR.

7. The gravure printing roll according to any one of claims 1 to 3, It is characterized in that The Young's modulus of the elastic member is 0.1 GPa or less.

8. The gravure printing roll according to any one of claims 1 to 3, It is characterized in that The invention further includes a holding member that holds the thin-walled metal sleeve that is provided separately from the inner roller.

9. The gravure printing roll according to claim 8, It is characterized in that The holding member is a flange provided on the transmission shaft at an outer side of the inner roller in the rotation axis direction.

10. A gravure printing device, It is characterized in that have: The gravure printing plate roller according to any one of claims 1 to 9; and The drum roller sandwiches the printing object between the drum roller and the gravure printing plate roller.

11. A method for manufacturing a laminated ceramic capacitor, It is characterized in that have: A step of forming an internal electrode pattern on a ceramic green sheet using the gravure printing device according to claim 10; A step of manufacturing a laminated body by laminating a plurality of the ceramic green sheets including the ceramic green sheet on which the internal electrode pattern is formed; a step of firing the laminate; and A step of providing external electrodes on the fired laminate.

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