Gravure printing plate and method for manufacturing laminated electronic component

Abstract

To provide a gravure printing plate capable of smoothly transferring a paste.SOLUTION: There is provided a gravure printing plate 12 which has a peripheral surface on which one or more printing patterns are provided, wherein a plurality of recesses 42 partitioned by a bank 41 is disposed in each of one or more printing patterns, the bank 41 has a wall surface part which is connected to bottom surface parts 421 of the recesses 42 and defines side surfaces of the recesses 42, the wall surface part is constituted by a curved surface, the bottom surface part 421 is constituted flatly, each of the recesses adjacent to each other in a direction parallel to the axial direction of the gravure printing plate 12 has a central part in the circumferential direction of the peripheral surface, each of the recesses 42 adjacent to each other passes through the central part and in a cross-section parallel to the radial direction and axial direction of the gravure printing plate 12, the bottom surface part 421 is disposed on the extension of the tangent line TL1 of the wall surface part at the connection position T1 of the wall surface part and the bottom surface part 421.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present disclosure relates to a gravure printing plate used in gravure printing, and a method for producing a laminated electronic component using the gravure printing plate. [Background technology]

[0002] Conventionally, as described in JP 2012-66559 A (Patent Document 1), when manufacturing laminated electronic components using a gravure printing plate, the gravure printing plate is immersed in a paste tank containing a conductive paste or a dielectric paste, the recesses in the gravure printing plate are filled with the paste, and the paste is transferred to a sheet. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2012-66559 A Summary of the Invention [Problem to be solved by the invention]

[0004] The plate surface of the gravure printing plate described in Patent Document 1 has a top, a bottom positioned a predetermined distance from the top, and an inclined portion connecting the top and bottom, the inclined portion having a first inclined surface connected to the top and having a first inclination angle, and a second inclined surface connected to the bottom and having a second inclination angle greater than the first inclination angle.

[0005] The second inclined surface rises from the bottom at a second inclination angle, and when the paste filled in the recessed portion of the plate surface is peeled off from the plate surface, the direction of the peeling force acting on the paste changes significantly at the boundary between the bottom and the second inclined surface. There is a concern that the paste will not be able to keep up with this large change in peeling force, and a considerable amount of paste will remain in the recessed portion during transfer.

[0006] The present disclosure has been made in consideration of the above-mentioned problems, and an object of the present disclosure is to provide a gravure printing plate capable of smoothly transferring paste, and a method for manufacturing a laminated electronic component using the gravure printing plate. [Means for solving the problem]

[0007] A gravure printing plate according to an aspect of the present disclosure is a cylindrical or columnar plate for printing paste on a ceramic green sheet. The gravure printing plate has a peripheral surface on which one or more printing patterns are provided. Each of the one or more printing patterns has a plurality of recesses separated by banks. The banks have a wall portion connected to a bottom portion of the recess and defining a side surface of the recess. The wall portion is formed of a curved surface. The bottom portion is formed flat. Each of the recesses adjacent to each other in a direction parallel to the axial direction of the gravure printing plate has a central portion in the circumferential direction of the peripheral surface. In a cross section passing through the central portion of each of the adjacent recesses and parallel to the radial direction and the axial direction of the gravure printing plate, the bottom portion is disposed on an extension of a tangent to the wall portion at a connection position between the wall portion and the bottom portion.

[0008] A gravure printing plate according to another aspect of the present disclosure is cylindrical or columnar for printing a paste onto a ceramic green sheet. The gravure printing plate has a peripheral surface on which one or more printing patterns are provided. Each of the one or more printing patterns has a plurality of recesses separated by bank portions. The bank portions have wall portions connected to bottom portions of the recesses and defining side surfaces of the recesses. The wall portions and the bottom portion are formed of curved surfaces.

[0009] In the gravure printing plate of the present disclosure, the bank portion may include an outer bank portion located on the peripheral side of the printing pattern and an inner bank portion located more inward than the outer bank portion. The outer bank portion may be thicker than the inner bank portion.

[0010] The method for manufacturing a laminated electronic component of the present disclosure includes the steps of transferring a dielectric paste or a conductive paste using the gravure printing plate to form a sheet, forming a laminate including the sheet, and firing the laminate. Effect of the Invention

[0011] According to the present disclosure, it is possible to provide a gravure printing plate capable of smoothly transferring a paste, and a method for manufacturing a laminated electronic component using the gravure printing plate. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a diagram showing a gravure printing apparatus equipped with a gravure printing plate according to a first embodiment. [Diagram 2] FIG. 1 is a perspective view showing a gravure printing plate according to a first embodiment. [Diagram 3] FIG. 2 is an enlarged view showing a printing pattern of the gravure printing plate according to the first embodiment. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV shown in FIG. [Diagram 5] 4 is a diagram showing a state in which paste is peeled off from recesses in the gravure printing plate according to the first embodiment. FIG. [Figure 6] 5 is a diagram showing a manufacturing flow for manufacturing a laminated electronic component using the gravure printing plate according to the first embodiment. FIG. [Figure 7] FIG. 11 is a diagram showing a cross section of a recessed portion of a gravure printing plate according to a second embodiment. [Figure 8] FIG. 11 is an enlarged view showing a printing pattern of a gravure printing plate according to a third embodiment. [Figure 9] FIG. 11 is an enlarged view showing a printing pattern of a gravure printing plate according to a fourth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In the embodiments described below, the same or common parts are denoted by the same reference characters in the drawings, and the description thereof will not be repeated.

[0014] (Embodiment 1) Fig. 1 is a diagram showing a gravure printing apparatus equipped with a gravure printing plate according to embodiment 1. Fig. 2 is a perspective view showing the gravure printing plate according to embodiment 1. A gravure printing apparatus 10 and a gravure printing plate 12 will be described with reference to Figs. 1 and 2.

[0015] The gravure printing apparatus 10 includes a backup roll 11 , a gravure printing plate 12 , a blade 13 , and a paste tank 15 .

[0016] The backup roll 11 and the gravure printing plate 12 are disposed opposite each other so as to form a nip portion. The green sheet 30 passes between the backup roll 11 and the gravure printing plate 12 so as to be sandwiched in the nip portion.

[0017] The backup roll 11 has a columnar or cylindrical shape and is provided so as to be rotatable in the direction of an arrow AR1 in FIG.

[0018] As shown in Fig. 2, the gravure printing plate 12 has a columnar or cylindrical shape. The diameter of the gravure printing plate 12 is, for example, about 10 mm to 400 mm. The width of the gravure printing plate 12 parallel to the axial direction CL is, for example, about 150 mm to 300 mm. The gravure printing plate 12 has a plurality of printing patterns 121 provided thereon. It is sufficient that one or more printing patterns 121 are provided.

[0019] As shown in Figure 1 again, the gravure printing plate 12 is provided so as to be rotatable in the direction AR2 in Figure 1. The gravure printing plate 12 is provided so as to be rotatable in the opposite direction to the backup roll 11.

[0020] Conductive paste 14 is stored in paste tank 15. A portion of gravure printing plate 12 is immersed in conductive paste 14, and when gravure printing is performed, the plate is rotated in the direction AR2 in the drawing, so that the conductive paste 14 fills a plurality of recesses 42 (see FIG. 3), which will be described later.

[0021] The blade 13 is disposed downstream of the paste tank 15, and is in contact with the gravure printing plate 12 with a predetermined pressure. The blade 13 scrapes off the excess conductive paste 14 adhering to the gravure printing plate 12.

[0022] Subsequently, when the gravure printing plate 12 holding an appropriate amount of conductive paste 14 passes through the nip portion, an electrode pattern 31 corresponding to the printing pattern 121 is printed on the green sheet 30 .

[0023] Fig. 3 is an enlarged view of the printing pattern of the gravure printing plate according to embodiment 1. Fig. 4 is a cross-sectional view taken along line IV-IV shown in Fig. 3. More specifically, Fig. 4 is a cross-section passing through central portions C1 and C2 in the circumferential direction of each of recesses 42 adjacent to each other in a direction parallel to the axial direction CL, and parallel to the radial direction of gravure printing plate 12 and the axial direction CL. The detailed structure of gravure printing plate 12 will be described with reference to Figs. 3 and 4.

[0024] 3, the outer shape of each of the multiple printed patterns 121 is substantially rectangular. More specifically, the outer shape of the printed patterns 121 is a rectangle having four rounded corners. Note that the printed patterns 121 are not limited to a substantially rectangular shape, and an appropriate shape can be adopted depending on the shape of the electrode pattern 31.

[0025] Each of the plurality of print patterns 121 has a plurality of recesses 42 separated by banks 41. The banks 41 are provided in a lattice pattern.

[0026] The bank portion 41 includes a plurality of vertical bank portions 45 and a plurality of horizontal bank portions 46. Each of the plurality of vertical bank portions 45 extends in the circumferential direction of the peripheral surface 12p. The plurality of vertical bank portions 45 are arranged side by side at intervals in a direction parallel to the axial direction CL. Each of the plurality of horizontal bank portions 46 extends in a direction parallel to the axial direction CL. The plurality of horizontal bank portions 46 are arranged side by side at intervals in the circumferential direction.

[0027] The multiple recesses 42 are arranged, for example, in a matrix with a row direction parallel to the circumferential direction and a column direction parallel to the axial direction.

[0028] As shown in FIG. 3 and FIG. 4, the bank portion 41 has a top portion 411 and a wall portion 43. The top portion 411 is configured to be substantially flat. The top portion 411 is substantially parallel to the opening surface of the recess 42. The wall portion 43 is connected to the bottom surface portion 421 of the recess 42 and defines the side surface of the recess 42. The wall portion 43 is connected to the periphery of the bottom surface portion 421 and has an annular shape. When the recess 42 is viewed along the depth direction of the recess 42, the periphery of the bottom surface portion 421 is located inside the outer edge of the opening surface of the recess 42. The wall portion 43 has a curved shape that curves toward the periphery of the bottom surface portion 421 as it progresses in the depth direction of the recess 42.

[0029] The wall surface portion 43 has a first wall surface portion 431 and a second wall surface portion 432 that face each other in a direction parallel to the axial direction CL, and a third wall surface portion 433 and a fourth wall surface portion 434 that face each other in the circumferential direction. As described above, each of the first wall surface portion 431 and the second wall surface portion 432 is configured with a curved surface that curves toward the periphery of the bottom surface portion 421 as it progresses in the depth direction of the recessed portion 42. Similarly, each of the third wall surface portion 433 and the fourth wall surface portion 434 is configured with a curved surface that curves toward the periphery of the bottom surface portion 421 as it progresses in the depth direction of the recessed portion 42.

[0030] The bottom surface portion 421 of the recess 42 is configured to be flat. In a cross section passing through the above-mentioned central portions C1, C2 and parallel to the radial direction of the gravure printing plate 12 and the above-mentioned axial direction CL, the bottom surface portion 421 is located on an extension line of a tangent line TL1 of the first wall surface portion 431 at a connection position T1 between the first wall surface portion 431 and the bottom surface portion 421. Also, in the above cross section, the bottom surface portion 421 is located on an extension line of a tangent line TL2 of the second wall surface portion 432 at a connection position T2 between the second wall surface portion 432 and the bottom surface portion 421. Note that the bottom surface portion 421 does not have to be configured to be flat.

[0031] In a cross section of the gravure printing plate 12 that passes through a center in a direction parallel to the axial direction CL of each of the circumferentially adjacent recesses 42 and is perpendicular to the axial direction CL, the bottom surface portion 421 is located on an extension of a tangent to the third wall surface portion 433 at a connection position between the third wall surface portion 433 and the bottom surface portion 421. Also, in the cross section, the bottom surface portion 421 is located on an extension of a tangent to the fourth wall surface portion 434 at a connection position between the fourth wall surface portion 434 and the bottom surface portion 421.

[0032] The shape of the recesses 42 described above can be achieved by adjusting the residence time of the etching solution when etching the peripheral surface 12p of the gravure printing plate 12.

[0033] FIG. 5 is a diagram showing a state in which paste is peeled off from recesses in the gravure printing plate according to the first embodiment.

[0034] 5, the wall surface portion 43 is formed of a curved surface, and the bottom surface portion 421 is located on an extension of the tangent line at the connection position with each of the first wall surface portion 431 to the fourth wall surface portion 434. Therefore, when the conductive paste 14 in the recess 42 is transferred, as shown by the arrow in the figure, a peeling force can be applied to the conductive paste 14 smoothly and continuously from the bottom surface portion 421 to the top portion 411. This allows the conductive paste 14 to be smoothly transferred to the green sheet 30. Specifically, 60% or more of the conductive paste 14 filled in the recess 42 can be transferred to the green sheet 30, and the amount of conductive paste 14 remaining in the recess 42 can be reduced.

[0035] The remaining amount of paste can be calculated, for example, as follows. First, the shapes of the ten recesses 42 are measured in advance using a laser displacement meter or the like. Next, the print pattern 121 is filled with paste 14, and each of the ten recesses 42 after transfer is measured using a laser displacement meter or the like. In this way, the remaining amount of paste in each recess 42 is measured, and the remaining amount of paste 14 is calculated by calculating the average value of the ten recesses. Furthermore, the amount of transferred paste 14 can also be calculated based on the calculated remaining amount of paste 14.

[0036] (Manufacturing method for laminated electronic components) 6 is a diagram showing a manufacturing flow for manufacturing a laminated electronic component using the gravure printing plate according to embodiment 1. The manufacturing method for the laminated electronic component according to embodiment 1 will be described with reference to FIG.

[0037] As shown in Fig. 6, when manufacturing a multilayer ceramic capacitor as a multilayer electronic component, first, in step (S1), a green sheet 30 and a conductive paste for internal electrodes are prepared. The green sheet 30 is formed from a dielectric paste obtained by kneading ceramic powder, such as barium titanate, a binder, a dispersant, a plasticizer, and the like. The conductive paste 14 is obtained by kneading conductive powder, a solvent, a binder, ceramic powder, and the like. The green sheet 30 and the conductive paste 14 may be publicly known ones.

[0038] 1, the conductive paste 14 for the internal electrodes is transferred in a predetermined pattern onto the green sheet 30 using a gravure printing plate 12. This results in a dielectric sheet 25 having an electrode pattern 31 formed thereon. The gravure printing plate 12 may be used when transferring the dielectric paste.

[0039] Subsequently, in step (S3), a plurality of dielectric sheets are laminated to produce a laminated sheet. Specifically, a predetermined number of dielectric sheets for outer layers on which no electrode pattern is printed are laminated, dielectric sheets 25 on which electrode pattern 31 is printed are laminated in sequence thereon, and a predetermined number of the dielectric sheets for outer layers are laminated thereon.

[0040] Subsequently, in step (S4), a laminated block is produced by pressing the laminated sheets in the lamination direction using a pressing device such as a hydrostatic press.

[0041] Next, in step (S5), a laminated chip is produced. Specifically, the laminated block is cut into a predetermined size using a cutting blade to cut out the laminated chip. At this time, the corners and ridges of the laminated chip may be rounded by barrel polishing or the like.

[0042] Next, in step (S6), the laminated chip is sintered at a sintering temperature of, for example, about 900° C. to 1300° C., depending on the materials of the dielectric material and the electrode pattern.

[0043] Next, in step (S7), external electrodes are formed. For example, a conductive paste for external electrodes is applied to both end surfaces of the laminated chip and baked to form baked layers on the end surfaces. At this time, the baking temperature is, for example, 700°C to 900°C. Next, a plating layer is provided on the surface of the baked layer as necessary. Through the above steps, a laminated electronic component can be manufactured.

[0044] (Embodiment 2) 7 is a diagram showing a cross section of a recessed portion of a gravure printing plate according to embodiment 2. Gravure printing plate 12A according to embodiment 2 will be described with reference to FIG.

[0045] 7, the gravure printing plate 12A according to the second embodiment differs from the gravure printing plate 12 according to the first embodiment in the shape of the recesses 42 (more specifically, the bottom surface portions 421). The other configurations are substantially the same.

[0046] In the second embodiment, in addition to wall surface portions 43, bottom surface portion 421 is also formed of a curved surface. Bottom surface portion 421 has a shape that curves toward the center of recess 42 as it extends in the depth direction. The radius of curvature of bottom surface portion 421 may be larger than the radius of curvature of wall surface portions 43. The radius of curvature can be confirmed by peeling off a portion of peripheral surface 12p of gravure printing plate 12, cutting the peeled off portion, and observing it under an optical microscope.

[0047] Even when configured in this manner, the gravure printing plate 12A according to embodiment 2 achieves substantially the same effects as those of embodiment 1. Because the bottom surface portion 421 is configured as a curved surface, the conductive paste 14 becomes more likely to separate from the gravure printing plate 12A during transfer.

[0048] In addition, by making the radius of curvature of bottom surface portion 421 larger than the radius of curvature of wall surface portion 43, the peeling force can be applied more smoothly to conductive paste 14. As a result, conductive paste 14 can be transferred to green sheet 30 more smoothly.

[0049] (Embodiment 3) 8 is an enlarged view of a printing pattern of a gravure printing plate according to embodiment 3. The gravure printing plate according to embodiment 3 will be described with reference to FIG.

[0050] 8, the gravure printing plate according to the third embodiment differs from the gravure printing plate 12 according to the first embodiment in terms of the printing pattern 121. The other configurations are almost the same.

[0051] In the third embodiment, a plurality of cutouts 47, 48 are provided in the bank portion 41. The cutouts 47, 48 are provided so that adjacent recesses 42 communicate with each other. A plurality of cutouts 47 are provided in each vertical bank portion 45. Note that each vertical bank portion 45 may be provided with a single cutout portion 47 instead of a plurality of cutouts.

[0052] The cutout portion 47 is provided in a portion of the vertical bank portion 45 located between adjacent recesses 42 in a direction parallel to the axial direction CL. The cutout portions 47 provided in the portions located between the plurality of recesses 42 aligned in the axial direction CL may be arranged side by side in the axial direction CL or may be arranged offset in the circumferential direction.

[0053] A plurality of cutout portions 48 are provided in each of the lateral bank portions 46. Note that each of the lateral bank portions 46 may be provided with a single cutout portion 48 instead of a plurality of cutout portions 48.

[0054] The cutout portion 48 is provided in a portion of the lateral bank portion 46 that is located between adjacent recesses 42 in a direction parallel to the axial direction CL. The cutout portions 48 provided in the portions that are located between each of the multiple recesses 42 that are lined up in the circumferential direction may be arranged side by side in the circumferential direction, or may be arranged offset in a direction parallel to the axial direction CL.

[0055] Even when configured as described above, the gravure printing plate according to embodiment 3 achieves substantially the same effects as embodiment 1. By providing a plurality of cutout portions 47, 48, the fluidity of conductive paste 14 can be improved.

[0056] (Embodiment 4) 9 is an enlarged view of a printing pattern of a gravure printing plate according to embodiment 4. The gravure printing plate according to embodiment 4 will be described with reference to FIG.

[0057] 9, the gravure printing plate according to the fourth embodiment has a different printing pattern 121 compared to the gravure printing plate according to the third embodiment. The other configurations are almost the same. Note that in the fourth embodiment, the plurality of cutouts 47, 48 may be omitted.

[0058] In embodiment 4, the bank portion 41 includes an outer bank portion located on the peripheral side of the printing pattern 121 and an inner bank portion located more inward than the outer bank portion, and the thickness (width) of the outer bank portion is thicker than the thickness (width) of the inner bank portion.

[0059] Specifically, for example, the outer bank portion is a portion of the bank portion 41 that is located outside the imaginary line VL in the figure. The outer bank portion is composed of, for example, both end portions 451 of each vertical bank portion 45A in the circumferential direction and both end portions 461 of each horizontal bank portion 46A in the direction parallel to the axial direction CL.

[0060] The width (width W1) of both ends 451 of the vertical bank portion 45A is larger than the width (width W3) of a portion 452 of the vertical bank portion 45A located between both ends 451. Similarly, the width (width W2) of both ends 461 of the horizontal bank portion 46A is larger than the width (width W3) of a portion 462 of the horizontal bank portion 46A located between both ends 461.

[0061] Even when configured in this manner, the gravure printing plate according to embodiment 4 achieves substantially the same effects as the gravure printing plate according to embodiment 3. In addition, since the outer bank portion is thicker than the inner bank portion, it is possible to prevent the conductive paste 14 near the outer edge of the printed pattern 121 from being carried to the outer edge of the printed pattern 121 during transfer. This makes it possible to prevent the formation of a protrusion called a saddle in the electrode pattern.

[0062] (Other variations) A groove having a width of 0.01 μm or more and 1 μm or less may be formed on the top 411 of the bank portion 41 and / or the peripheral surface 12p of the gravure printing plate. The groove may extend in a direction parallel to the axial direction CL, or may extend in the circumferential direction. The provision of the groove makes it easier to scrape off excess conductive paste 14 with blade 13.

[0063] Furthermore, the size of the recesses 42 located on the inside of the printed pattern 121 may be smaller than the size of the recesses 42 located on the outside of the printed pattern 121. By making the recesses 42 located on the inside smaller, it is possible to form a large number of bank portions 41. Since the conductive paste 14 is transferred starting from the bank portions 41, the transfer efficiency of the conductive paste 14 can be improved by arranging a large number of bank portions 41.

[0064] The embodiments disclosed herein are illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims, and includes all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0065] 10 gravure printing device, 11 backup roll, 12, 12A gravure printing plate, 12p peripheral surface, 13 blade, 14 conductive paste, 15 paste tank, 25 dielectric sheet, 30 green sheet, 31 electrode pattern, 41 bank portion, 42 recess, 43 wall portion, 45, 45A vertical bank portion, 46, 46A horizontal bank portion, 47, 48 notch portion, 121 printing pattern, 411 top portion, 421 bottom portion, 431 first wall portion, 432 second wall portion, 433 third wall portion, 434 fourth wall portion, 451, 461 both ends, C1, C2 center portion, CL axial direction, T1, T2 connection position, TL1, TL2 tangent, VL virtual line.

Claims

1. A cylindrical or columnar gravure printing plate for printing a paste on a ceramic green sheet, a peripheral surface provided with one or more printed patterns; Each of the one or more printing patterns has a plurality of recesses separated by bank portions arranged therein; the bank portion has a wall portion connected to a bottom portion of the recess and defining a side surface of the recess, The wall portion is configured with a curved surface, The bottom surface is flat. each of the recesses adjacent to each other in a direction parallel to the axial direction of the gravure printing plate has a central portion in the circumferential direction of the peripheral surface; A gravure printing plate, in a cross section passing through the central portions of each of the adjacent recesses and parallel to the radial and axial directions of the gravure printing plate, the bottom surface portion is positioned on an extension of a tangent to the wall surface portion at the connection position between the wall surface portion and the bottom surface portion.

2. A cylindrical or columnar gravure printing plate for printing a paste on a ceramic green sheet, a peripheral surface provided with one or more printed patterns; Each of the one or more printing patterns has a plurality of recesses separated by bank portions arranged therein; the bank portion has a wall portion connected to a bottom portion of the recess and defining a side surface of the recess, The wall surface portion and the bottom surface portion are formed of curved surfaces.

3. the bank portion includes an outer bank portion located on the peripheral side of the print pattern and an inner bank portion located more inward than the outer bank portion, The gravure printing plate according to claim 1 or 2, wherein the outer bank portion is thicker than the inner bank portion.

4. A step of transferring a dielectric paste or a conductive paste to the gravure printing plate according to claim 1 or 2 to form a sheet; forming a laminate including the sheet; and firing the laminate.

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