CN217197338U

CN217197338U - Gravure plate and gravure printing machine

Info

Publication number: CN217197338U
Application number: CN202220333328.5U
Authority: CN
Inventors: 幸川进一; 平野博之; 金山吉广
Original assignee: Murata Manufacturing Co Ltd
Current assignee: Murata Manufacturing Co Ltd
Priority date: 2021-02-22
Filing date: 2022-02-18
Publication date: 2022-08-16
Anticipated expiration: 2032-02-18
Also published as: JP2022128283A

Abstract

The utility model provides an intaglio and intaglio printing machine, this intaglio can also ensure the paste rendition in the starting point of being rendition piece fully when guaranteeing the mobility of the paste between the adjacent unit. The recessed plate (2) has a cylindrical or columnar shape, and a recessed portion (13) for holding the paste (12) transferred to the sheet (3) to be transferred is provided on the outer peripheral surface of the recessed plate (2), wherein the recessed portion (13) includes, inside: a vertical dike (15) extending in the circumferential direction of the outer peripheral surface; a horizontal bank (16) having one end connected to a 1 st longitudinal bank (15) of the longitudinal banks (15) and the other end facing a 2 nd longitudinal bank (15) side extending adjacent to the 1 st longitudinal bank (15), extending substantially perpendicular to the 1 st longitudinal bank (15) and not connected to the 2 nd longitudinal bank (15); and a transfer auxiliary unit (20) provided at the tip of the other end of the horizontal bank (16).

Description

Gravure plate and gravure printing machine

Technical Field

The utility model relates to an intaglio and intaglio printing machine.

Background

In the case of manufacturing a laminated electronic component such as a laminated ceramic capacitor, for example, gravure printing is widely used in which a conductive paste to be an internal electrode is transferred to a transfer target sheet such as a ceramic green sheet. An intaglio printing press for performing intaglio printing includes a cylindrical intaglio plate having a concave portion in the shape of a transfer pattern formed on an outer peripheral surface thereof, and an impression cylinder that sandwiches a to-be-transferred sheet between the intaglio plate and presses the to-be-transferred sheet toward the intaglio plate.

When the depressed plate rotates, the concave portion to which the paste is supplied from the paste supply portion is gradually raised, and the paste in the concave portion is transferred to the transfer target sheet at a position where the transfer target sheet is sandwiched.

During transfer, the inside of the concave portion is in a state in which the horizontal position on the front side in the rotation direction, i.e., the transfer direction, is higher than the horizontal position on the rear side. Therefore, the paste held in the concave portion is shifted to the rear side in the transfer direction. When the paste is transferred to the transfer target sheet in this state, the transfer amount of the paste on the front side in the transfer direction is smaller than the transfer amount of the paste on the rear side, and the transferred paste may be blurred.

Therefore, there have been techniques for: the concave portion is divided into a plurality of cells by providing vertical banks extending in the transfer direction of the sheet to be transferred and horizontal banks extending in the direction orthogonal to the transfer direction in the concave portion, thereby preventing the paste from being deviated backward. The horizontal banks serve as starting points for paste transfer to the sheet to be transferred, and the occurrence of blur in the transferred paste is reduced.

However, if the inside of the concave portion is completely divided into a plurality of independent cells, if the amount of the paste in the concave portion is not uniform, the thickness of the paste to be transferred may become non-uniform.

Therefore, conventionally, there is a technique of providing a gap in the banks to partially communicate the cells adjacent to each other in the transfer direction (see, for example, patent document 1).

Documents of the prior art

Patent literature

Patent document 1: japanese patent laid-open No. 2007-320316

SUMMERY OF THE UTILITY MODEL

Problem to be solved by utility model

However, according to the above-described conventional technique, since the lateral banks are formed with the gaps, the lateral banks become shorter, and the lateral banks respectively serve as starting points of paste transfer to the transfer target sheet, thereby reducing the effect of reducing the occurrence of blur in the transferred paste.

The utility model aims at providing a can also fully ensure the gravure and the intaglio printing machine of paste rendition in the starting point of being transferred the printing piece when guaranteeing the mobility of paste between adjacent unit.

Means for solving the problems

In order to solve the above problem, according to a first aspect of the present invention, there is provided an intaglio plate having a cylindrical or columnar shape and provided with a recessed portion on an outer peripheral surface thereof for holding a paste transferred onto a transfer target sheet, the intaglio plate including, in the recessed portion: a vertical bank extending in a circumferential direction of the outer circumferential surface; a horizontal bank having one end connected to a 1 st longitudinal bank among the longitudinal banks and the other end facing a 2 nd longitudinal bank extending adjacent to the 1 st longitudinal bank, extending substantially perpendicular to the 1 st longitudinal bank and not connected to the 2 nd longitudinal bank; and a transfer auxiliary unit provided at the tip of the other end of the horizontal bank.

The transfer assist portion may include a 1 st transfer assist portion provided at the leading end and a 2 nd transfer assist portion provided on the one end side of the 1 st transfer assist portion.

The transfer auxiliary portion may have a triangular cross section along the outer peripheral surface.

The transfer auxiliary portion may have a square cross section along the outer peripheral surface.

Furthermore, the utility model discloses a 2 nd technical scheme provides an intaglio printing press, wherein, this intaglio printing press possesses: an intaglio plate having a cylindrical or columnar shape, the intaglio plate having a recessed portion provided on an outer peripheral surface thereof for holding a paste to be transferred to a sheet to be transferred, the recessed portion including, inside the recessed portion, a vertical bank extending in a circumferential direction of the outer peripheral surface, a horizontal bank having one end connected to a 1 st vertical bank of the vertical banks and the other end facing a 2 nd vertical bank side extending adjacent to the 1 st vertical bank and extending substantially perpendicular to the 1 st vertical bank and not connected to the 2 nd vertical bank, and a transfer assist portion provided at a tip of the other end of the horizontal bank; a paste supply unit in which the paste is stored; and an impression cylinder that sandwiches the sheet to be transferred between the impression cylinder and the intaglio.

Effect of the utility model

According to the present invention, the fluidity of the paste between the adjacent cells is ensured, and the paste can be sufficiently ensured to be transferred to the gravure printing machine and the gravure printing machine of the starting point of the transferred sheet.

Drawings

Fig. 1 is a schematic view showing an intaglio printing press 1.

Fig. 2 is a cross-sectional view of the ceramic green sheet 3 to which the conductive paste 12 is transferred using the gravure printing machine 1.

Fig. 3 is a perspective view of the depressed plate 2.

Fig. 4 is an enlarged view of the concave portion 13.

Fig. 5 is a partial enlarged view of the inner region.

Fig. 6 is a diagram illustrating the transfer assisting unit 120 according to modification 1.

Fig. 7 is a diagram illustrating the transfer assisting unit 220 according to modification 2.

Fig. 8 is a diagram illustrating a transfer assisting unit 320 according to modification 3.

Description of the reference numerals

1. An intaglio printing press; 2. intaglio printing; 3. a ceramic green sheet; 4. an impression cylinder; 11. a paste supply unit; 12. a conductive paste; 13. a recess; 14. a scraper; 15. 15D, 15Da, 15Db, longitudinal dike; 16. 16D, 16Da, 16Db and a transverse dike; 17. 17D, a unit; 18. 18a, 18b, gap; 20. 20a, 20b, 120, a transfer assist section.

Detailed Description

The following describes an intaglio printing press 1 according to embodiment 1 of the present invention, an intaglio plate 2 provided in the intaglio printing press 1, and a method for manufacturing a multilayer ceramic capacitor as an example of a multilayer electronic component using the intaglio printing press 1. Fig. 1 is a schematic diagram showing an intaglio printing press 1. Fig. 2 is a cross-sectional view of the ceramic green sheet 3 to which the conductive paste 12 is transferred using the gravure printing machine 1.

The gravure printing machine 1 is a device that transfers a conductive paste 12, which is an internal electrode of a laminated ceramic capacitor, onto a ceramic green sheet 3, which is a transfer target sheet.

The intaglio printing press 1 comprises: a cylindrical depressed plate 2 in which a concave portion 13 in the shape of a transfer pattern of the conductive paste 12 is formed; a paste supply unit 11 in which a conductive paste 12 is stored; an impression cylinder 4 that sandwiches the ceramic green sheet 3 between the impression cylinder and the intaglio 2; and a doctor blade 14 disposed on a side portion of the depressed plate 2. Hereinafter, the side of the depressed plate 2 on which the paste supply portion 11 is disposed is referred to as a lower side. The impression cylinder 4 is disposed above the depressed plate 2. The gravure plate 2 and the impression cylinder 4 rotate in the direction of arrow 5 and the direction of arrow 6, respectively, thereby conveying the ceramic green sheet 3 in the direction of arrow 7.

(ceramic green sheet 3)

The ceramic green sheet 3 shown in fig. 2 is a transfer target sheet in a band shape obtained by molding a ceramic slurry 8 containing a ceramic powder, a binder and a solvent on a carrier film 10 using a die coater, a gravure coater, a mini-gravure coater or the like.

(intaglio 2)

Fig. 3 is a perspective view of the depressed plate 2. The depressed plate 2 is rotatable about a horizontally extending shaft 2A, and has a cylindrical or columnar member. The depressed plate 2 has a plurality of recesses 13 formed on the outer peripheral surface thereof, the recesses corresponding to the shape of the transfer pattern transferred to the ceramic green sheet 3. In fig. 3, only two recesses 13 are shown, but the recesses 13 are arranged at substantially equal intervals in the axial direction Y and the transfer direction X (circumferential direction, rotational direction) of the outer peripheral surface of the depressed plate 2.

In the embodiment, the recessed portions 13 are arranged such that the longitudinal direction of the recessed portions 13 is oriented in the transfer direction X of the depressed plate 2 and the width direction of the recessed portions 13 is oriented in the axial direction Y parallel to the axis 2A of the depressed plate 2.

(concave part 13)

Fig. 4 is an enlarged view of 1 recess 13. The concave portions 13 are formed by etching, engraving, or the like using a photomask blank, and the plurality of concave portions 13 have the same shape and are formed to be arranged at constant intervals in the axial direction Y and the transfer direction X of the depressed plate 2. Each of the recesses 13 is provided with a vertical bank 15 extending in the transfer direction X and a horizontal bank 16 extending in an axial direction Y perpendicular to the vertical bank 15. The details of the vertical banks 15 and the horizontal banks 16 will be described later.

(paste supply part 11)

Referring back to fig. 1, the paste supply portion 11 is a reservoir tank for the conductive paste 12 disposed below the depressed plate 2. The conductive paste 12 contains, for example, Ni powder having a particle diameter of 0.03 to 1 μm as a conductive material. Further, a resin is used as the binder. Further, a ceramic material, a dispersant, and the like for controlling shrinkage during sintering are added. The conductive paste 12 is stored in the paste supply section 11, and the lower portion of the depressed plate 2 is immersed in the conductive paste 12. This allows the conductive paste 12 to be held in the concave portion 13 on the outer peripheral surface of the depressed plate 2.

(scraper 14)

A doctor blade 14 is disposed on a side of the depressed plate 2. The conductive paste 12 enters the concave portion 13 of the depressed plate 2 in the paste supply portion 11, and is conveyed to the contact portion with the ceramic green sheet 3 by the rotation of the depressed plate 2. In the middle, the doctor blade 14 is pressed against the surface of the depressed plate 2, and the conductive paste 12 adhering to the portion of the surface of the depressed plate 2 other than the recessed portion 13 is scraped off by the doctor blade 14.

(impression cylinder 4)

The impression cylinder 4 is disposed on the depressed plate 2, and is a cylindrical or columnar member that rotates about an impression cylinder axis 4A substantially parallel to the axis 2A. The outer peripheral surface of the impression cylinder 4 is covered with an elastic member. The elastic member is made of a rubber member such as silicone rubber or urethane rubber, or a resin material, but is not limited thereto, and may be made of another elastic material.

The impression cylinder 4 sandwiches the ceramic green sheet 3 with the depressed plate 2, and presses the ceramic green sheet 3 toward the depressed plate 2.

Here, the impression cylinder 4 is an elastic body and thus elastically deforms, and the contact portion of the depressed plate 2 and the impression cylinder 4 has a predetermined impression width N. The conductive paste 12 held in the concave portion 13 of the depressed plate 2 is transferred to the ceramic green sheet 3 in the range of the imprint width N. In the embodiment, the dimension L of the recessed portion 13 of the depressed plate 2 in the longitudinal direction, which is the transfer direction X, is smaller than the nip width N.

(longitudinal dike 15 and transverse dike 16)

Next, the vertical banks 15 and the horizontal banks 16 provided in the concave portion 13 will be described in detail.

The transfer direction X shown in fig. 4 is a direction opposite to the rotation direction indicated by the arrow 5 shown in fig. 1. The right end side of the concave portion 13 in fig. 4 is a transfer start end, and the left end side is a transfer end, and in the transfer step, the contact position of the concave portion 13 with the ceramic green sheet 3 is moved from the right end side to the left end side in fig. 4.

Each of the recesses 13 is provided with a plurality of parallel vertical banks 15(15A, 15B, 15D) extending in the transfer direction X, and a plurality of parallel horizontal banks 16(16A, 16B, 16C, 16D) extending in a direction perpendicular to the vertical banks 15. The inside of the recess 13 is divided into a plurality of cells 17(17A, 17B, 17C, 17D) by the vertical banks 15 and the horizontal banks 16.

In the embodiment, the thickness and structure of the vertical banks 15 and the horizontal banks 16 and the size of the cells 17 are different between the edge region and the inner region of the recess 13.

(transfer printing terminal edge part region)

The widths of the vertical banks 15A and the horizontal banks 16A in the edge area on the transfer terminal side of the concave portion 13 are larger than the widths of the vertical banks 15D and the horizontal banks 16D in the internal area, and thus the size of the cells 17A in the edge area on the transfer terminal side is smaller than the size of the cells 17D in the central portion.

(axial edge region)

The widths of the vertical banks 15B and the horizontal banks 16B in the edge regions on both sides of the recess 13 in the axial direction Y are larger than the widths of the vertical banks 15D and the horizontal banks 16D in the inner region. The interval in the transfer direction X between the lateral banks 16B extending from the longitudinal bank 15B at the end in the axial direction Y toward the outer peripheral wall 13B of the recess 13 is half the interval in the transfer direction X between the lateral banks 16D in the inner region. Therefore, the size of the cell 17B in the edge portion in the axial direction Y is smaller than the size of the cell 17D in the central portion.

(transfer origin side)

Two start end grooves extending in the axial direction Y, i.e., a start end groove 13F and a start end groove 13E, are provided at positions closer to the transfer start end side than the concave portion 13, independently of the concave portion 13.

Further, the lateral banks 16C of the recessed portion 13 closest to the transfer start end side extend continuously in the axial direction Y, and the interval between the lateral banks 16C and the outer peripheral wall 13C of the recessed portion 13 is narrower than the interval between the vertical banks 15D in the inner region. Therefore, the size of the cell 17C is smaller than that of the cell 17D in the center portion.

(contour groove 13G)

In the edge area on the transfer terminal side, the outer peripheral wall 13A of the recess 13 is not connected to and separated from the vertical bank 15A and the horizontal bank 16A. In the edge portions on both sides in the axial direction Y, the outer peripheral wall 13B of the recess 13 is not connected to but separated from the horizontal dam 16B. That is, the contour groove 13G is provided along 3 sides of the recess 13 excluding the side on the transfer start end side.

(inner region)

Next, the vertical banks 15D and the horizontal banks 16D in the inner region of the recess 13 excluding the edge region will be described. Fig. 5 is a partial enlarged view of the inner region. Hereinafter, one of the vertical banks 15D adjacent to each other is referred to as a 1 st vertical bank 15Da and the other vertical bank 15D is referred to as a 2 nd vertical bank 15Db as necessary. Note that, one of the banks 16D adjacent to each other is the 1 st bank 16Da, and the other bank 16D is the 2 nd bank 16 Db.

Note that, when it is not necessary to distinguish between the 1 st vertical bank 15Da and the 2 nd vertical bank 15Db, the vertical banks 15D will be described together, and when it is not necessary to distinguish between the 1 st horizontal bank 16Da and the 2 nd horizontal bank 16Db, the horizontal bank 16D will be described together.

(Structure of dike)

The plurality of horizontal banks 16 arranged in the space extending in the transfer direction X between the 1 st vertical bank 15Da and the 2 nd vertical bank 15Db are parallel to each other, and divide the space into a plurality of cells 17D.

The 1 st horizontal bank 16Da is connected at one end to the 1 st vertical bank 15Da, and at the other end, extends toward the 2 nd vertical bank 15Db side but is not connected to the 2 nd vertical bank 15 Db. The 2 nd horizontal bank 16Db has one end connected to the 2 nd vertical bank 15Db and the other end extending toward the 1 st vertical bank 15Da but not connected to the 1 st vertical bank 15 Da.

The 1 st horizontal bank 16Da and the 2 nd horizontal bank 16Db are alternately arranged in the transfer direction X and also alternately arranged in the axial direction Y.

The 1 st horizontal bank 16Da and the 2 nd horizontal bank 16Db extend from the same position in the transfer direction X of the vertical bank 15D to one side and the other side in the axial direction Y, respectively, and the 1 st horizontal bank 16Da and the 2 nd horizontal bank 16Db connected to the 1 st horizontal bank 16Da cross the vertical bank 15D as 1 horizontal bank 16D.

(transfer auxiliary section 20)

In the embodiment, a 1 st transfer auxiliary unit 20a in a bank shape is provided at the leading end of the 1 st horizontal bank 16Da, and a 2 nd transfer auxiliary unit 20b in a bank shape is provided at the leading end of the 2 nd horizontal bank 16 Db.

The first transfer auxiliary unit 20a and the second transfer auxiliary unit 20b have the same shape, and hereinafter, the first transfer auxiliary unit 20a and the second transfer auxiliary unit 20b will be collectively described as the transfer auxiliary unit 20 in a case where it is not necessary to distinguish the first transfer auxiliary unit 20a from the second transfer auxiliary unit 20 b.

The transfer auxiliary section 20 is a portion for ensuring a further starting point of transfer, and at least the width in the circumferential direction (transfer direction X) thereof is wider than the width in the circumferential direction (transfer direction X) of the lateral banks 16D. In the embodiment, the cross section of the transfer auxiliary portion 20 along the outer peripheral surface of the depressed plate 2 is substantially circular.

(gap 18)

Further, a 1 st gap 18a is provided between the 1 st transfer auxiliary portion 20a and the 2 nd vertical bank 15 Db. A2 nd gap 18b is provided between the 2 nd transfer auxiliary portion 20b and the 1 st vertical bank 15 Da.

The 1 st gap 18a and the 2 nd gap 18b are different in position in the axial direction Y, and the 1 st gap 18a and the 2 nd gap 18b are alternately arranged in the transfer direction X. In other words, the 1 st and 2

nd gaps

18a and 18b are provided at the portions of the diagonally opposite two corners of each cell 17D, respectively. The cells 17D adjacent in the transfer direction X are communicated by the 1 st gap 18a and the 2 nd gap 18b described above.

In the embodiment, the 1 st and 2

nd gaps

18a and 18b have the same width in the axial direction Y. Hereinafter, the 1 st gap 18a and the 2 nd gap 18b will be collectively described as the gap 18 without distinguishing them.

(transfer step of conductive paste 12)

Next, a transfer step of transferring the conductive paste 12 to the ceramic green sheet 3 by using the gravure printing machine 1 will be described.

The depressed plate 2 is rotated by a driving device not shown. Then, as shown in fig. 1, the lower portion of the depressed plate 2 is immersed in the conductive paste 12 stored in the paste supply portion 11, and the conductive paste 12 is held in the plurality of concave portions 13 formed on the outer peripheral surface of the depressed plate 2.

When the depressed plate 2 rotates to pass the doctor blade 14, the excess conductive paste 12 on the outer peripheral surface of the depressed plate 2 is scraped off.

By rotating the depressed plate 2, the conductive paste 12 in the concave portion 13 is further conveyed to the contact position with the ceramic green sheet 3.

At the contact position, the ceramic green sheet 3 is pressed against the outer peripheral surface of the depressed plate 2 by the impression cylinder 4. At this time, the conductive paste 12 filled in the concave portion 13 of the depressed plate 2 is transferred to the ceramic green sheet 3, and the conductive paste 12 in a pattern is printed on the ceramic green sheet 3.

Here, when the transfer start end portion of the concave portion 13 moves to the contact position, the horizontal position of the inside of the concave portion 13 on the front side in the transfer direction X is higher than the horizontal position on the rear side in the transfer direction X. Therefore, the conductive paste 12 held in the concave portion 13 tends to flow toward the rear side in the transfer direction X.

However, in the embodiment, the inside of the concave portion 13 is divided into a plurality of cells 17 by vertical banks 15 extending in the transfer direction X and horizontal banks 16 extending in a direction orthogonal to the transfer direction X. Therefore, the horizontal banks 16 can prevent the backward flow of the conductive paste 12. Then, the horizontal banks 16 respectively serve as starting points from which the conductive paste 12 is transferred to the ceramic green sheet 3, and the occurrence of blur in the transferred conductive paste 12 is reduced.

Here, if the inside of the concave portion 13 is completely divided into the plurality of cells 17 independent of each other, the conductive paste 12 does not flow between the adjacent cells 17 at the time of transfer, and when the amount of the conductive paste 12 in the concave portion 13 is not uniform, the thickness of the transferred conductive paste 12 may become non-uniform.

However, in the embodiment, the cells 17 adjacent to each other in the transfer direction X are partially communicated with each other by providing the horizontal banks 16 with the gaps 18. Therefore, the fluidity of the conductive paste 12 is increased between the cells 17 adjacent in the transfer direction X. Thereby, the conductive paste 12 can flow while filling the cells 17 divided by the horizontal banks 16. As a result, the uniformity of the thickness of the transferred conductive paste 12 is improved.

On the other hand, since the gap 18 is provided in the horizontal bank 16, the horizontal bank 16 which becomes a starting point of transfer of the conductive paste 12 becomes short by a corresponding amount.

However, in the embodiment, the transfer auxiliary unit 20 is provided at the leading end of the lateral bank 16. The transfer auxiliary unit 20 has a circular shape having a diameter larger than the width of the lateral banks 16. Therefore, the transfer assist section 20 can supplement the transfer start point, and thus the transfer start point can be sufficiently ensured, and the occurrence of blur can be reduced.

The diameter of the transfer auxiliary portion 20 is larger than the width of the lateral banks 16 in the transfer direction (circumferential direction) X. Therefore, a pit is formed in the connecting portion that changes from the side surface of the bank 16 to the curved surface of the transfer auxiliary portion 20. When the conductive paste 12 is moved in the transfer direction by the rotation of the depressed plate 2, the conductive paste 12 is retained in the pits to increase the amount of the conductive paste 12, and therefore, the transfer omission of the conductive paste 12 can be further prevented.

Further, when the depressed plate 2 is rotated and separated from the ceramic green sheet 3, a wire drawing phenomenon of the conductive paste 12 occurs. The resulting filament moves in the transfer direction (rotational direction) X and along the curved surface of the transfer assist section 20 and thus also in the axial direction Y. Thus, the conductive paste 12 can be uniformly applied as compared with the case where the filament is continuously generated at a constant position in the axial direction Y.

In the embodiment, the dimension L of the concave portion 13 of the depressed plate 2 in the transfer direction X is smaller than the nip width N.

Therefore, at the time of transfer, the ceramic green sheet 3 is separated from the depressed plate 2 after the entire recessed portion 13 comes into contact with the ceramic green sheet 3. Therefore, the uniformity of the transfer of the conductive paste 12 to the ceramic green sheet 3 can be further improved.

Two start end grooves extending in the axial direction Y, i.e., a start end groove 13F and a start end groove 13E, are provided on the transfer start end side of the concave portion 13 independently of the unit 17.

The above-described leading end groove 13F and leading end groove 13E can further reduce the occurrence of blurring and insufficient thickness of the conductive paste 12 on the transfer leading end side.

Further, on both sides in the axial direction Y and on the transfer terminal side, the outer peripheral wall 13B of the recess 13 is not connected to the vertical banks 15 and the horizontal banks 16, but is provided with contour grooves 13G. That is, the contour groove 13G is provided along 3 sides of the recess 13 excluding the side on the transfer starting end side.

This can improve the linearity of the profile of the conductive paste 12.

In general, when the conductive paste 12 is transferred to the ceramic green sheet 3 by gravure printing, a so-called "saddle phenomenon" (japanese: サドル phenomenon) in which the peripheral edge portion of the transferred conductive paste 12 becomes thick is likely to occur. When a multilayer ceramic capacitor is manufactured using the conductive paste 12 in which the "saddle phenomenon" occurs, short-circuit defects and structural defects may be caused.

In the depressed plate 2 of the present embodiment, since the cells 17(17A, 17B, 17C) located in the edge area on both sides of the recess 13 in the axial direction Y are smaller than the cell 17(17D) located in the inner area of the recess 13, "saddle phenomenon" does not easily occur.

(method of manufacturing multilayer ceramic capacitor)

Next, a method for manufacturing the multilayer ceramic capacitor will be described.

After the ceramic green sheets 3 on which the conductive paste 12 shown in fig. 2 is formed are obtained using the gravure printing machine 1, a plurality of ceramic green sheets 3 are laminated and pressure-bonded, cut as necessary, and then fired to produce a laminate. Then, the external electrodes are formed on the laminated body to manufacture the laminated ceramic capacitor.

In the multilayer ceramic capacitor, as described above, the conductive paste 12 is smooth as a whole without blurring or the like.

Therefore, stress is not locally concentrated in the pressure bonding step, and thus it is possible to prevent a short-circuit failure in which the internal electrodes contact via the ceramic layers, or an insulation resistance failure in which the thickness of the ceramic layers is locally reduced.

While one embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications are possible.

(modification 1)

Fig. 6 is a diagram illustrating the transfer assisting unit 120 according to modification 1. In the above embodiment, one circular transfer auxiliary unit 20 is provided at the tip of each of 1 horizontal bank 16. However, the present invention is not limited to this, and the transfer auxiliary section 120 may include, for example, a 1 st transfer auxiliary section 120A and a 2 nd transfer auxiliary section 120B each having a rectangular shape as shown in fig. 6.

The 1 st transfer auxiliary portion 120A is provided at the leading end of the lateral bank 16, has a width in the circumferential direction (transfer direction X) larger than the width of the lateral bank 16 in the circumferential direction (transfer direction X), and has a rectangular shape whose cross section along the outer circumferential surface is the longitudinal direction in the transfer direction X.

The 2 nd transfer auxiliary portion 120B is provided closer to the vertical bank 15 side to which the horizontal bank 16 is connected than the 1 st transfer auxiliary portion 120A, has a width in the circumferential direction (transfer direction X) larger than that of the horizontal bank 16, and has a rectangular shape whose cross section along the outer circumferential surface is the longitudinal direction in the transfer direction X.

In addition, in the 1 st modification example, the width in the transfer direction X of the 2 nd transfer auxiliary portion 120B is larger than the width in the transfer direction X of the 1 st transfer auxiliary portion 120A, but the width is not limited to this, and may be the same as the width in the transfer direction X of the 1 st transfer auxiliary portion 120A or may be smaller than the width in the transfer direction X of the 1 st transfer auxiliary portion 120A.

In addition, the 1 st transfer auxiliary unit 120A and the 2 nd transfer auxiliary unit 120B of the 1 st modification are each rectangular, but one or both may be circular.

The modification 1 also has the same effects as those of the above-described embodiment.

However, in modification 1, since the number of transfer assisting sections 120 is larger than that in the above embodiment, the transfer start point can be supplemented and the transfer start point can be ensured to be larger.

Further, since the number of the connection portions between the transfer auxiliary portion 120 and the banks 16 is also larger than that in the above embodiment, the number of the pits formed in the connection portions is also larger, the conductive paste 12 is more accumulated, and transfer omission of the conductive paste 12 can be further prevented.

(modification 2)

Fig. 7 is a diagram illustrating the transfer assisting unit 220 according to modification 2. In the above embodiment, the transfer auxiliary portion 20 has a circular shape. However, the present invention is not limited to this, and the cross section of the transfer auxiliary unit 220 along the outer peripheral surface may be triangular as shown in fig. 7.

The modification 2 also has the same effects as those of the above-described embodiment.

However, in modification 2, since the transfer auxiliary unit 220 has a triangular shape, the conductive paste 12 is more likely to accumulate in the pits at the connection portions between the transfer auxiliary unit 20 and the banks 16 than in the case of the circular shape of the embodiment. Therefore, when the conductive paste 12 is moved in the transfer direction by the rotation of the depressed plate 2, a large amount of the conductive paste 12 remains in the pits, and therefore, the transfer omission of the conductive paste 12 can be further prevented.

Further, when the depressed plate 2 is rotated and separated from the ceramic green sheet 3, a wire drawing phenomenon of the conductive paste 12 occurs. The produced filaments move in the axial direction Y along the inclined surface of the tip end of the transfer auxiliary portion 220, which is a thin triangle. Therefore, the conductive paste 12 can be uniformly applied, as compared with the case where the filaments are continuously generated at a constant position in the axial direction Y.

(modification 3)

Fig. 8 is a diagram illustrating a transfer assisting unit 320 according to modification example 3. In the above embodiment, the transfer auxiliary portion 20 has a circular shape. However, the present invention is not limited to this, and the transfer auxiliary unit 320 may have a square shape in cross section along the outer peripheral surface as shown in fig. 8.

The modification 3 also has the same effects as those of the above-described embodiment.

However, in modification 3, since the transfer auxiliary unit 220 is a square, the conductive paste 12 is more likely to accumulate in a pit at the connection between the transfer auxiliary unit 20 and the bank 16 than in the case of the circular shape of the embodiment. Therefore, when the conductive paste 12 is moved in the transfer direction by the rotation of the depressed plate 2, a large amount of the conductive paste 12 remains in the pits, and therefore, the transfer omission of the conductive paste 12 can be further prevented.

(Experimental example)

Next, a plurality of depressed plates 2 having different bank shapes in the inner region of the depressed portion 13 were prepared, and the inner electrodes were printed 100 times by depressed plate printing using the depressed plates 2, and the results of observing whether there was any print blur by an optical microscope are shown in the following table. In the table, a case where print blur occurred 10 times or more out of 100 times was judged as poor, 1 time or more and less than 10 times was judged as good, and 0 time was judged as excellent.

Comparative example 1 is a case where only the vertical banks are provided without the transfer auxiliary unit and the horizontal banks.

In comparative example 2, the vertical banks and the horizontal banks were provided without the transfer auxiliary unit.

The embodiment is a case where the transfer auxiliary unit 20 is circular.

The 1 st modification example is a case where the 1 st transfer auxiliary unit 120A and the 2 nd transfer auxiliary unit 120B described above are provided.

The 2 nd modification is a case where the transfer auxiliary unit 220 is triangular.

The 3 rd modification is a case where the transfer auxiliary unit 320 is square.

As shown in the table, in the case of comparative example 1 having only the vertical banks, 36 out of 100 times of printing blur were x, and in the case of comparative example 2 having only the vertical banks and the horizontal banks, 25 out of 100 times of printing blur were x, and a considerable proportion of printing blur occurred.

On the other hand, in the embodiment in which the transfer auxiliary portion 20 is circular, 1 print blur is present in 100 times and good, in the 1 st modification including the 1 st transfer auxiliary portion 120A and the 2 nd transfer auxiliary portion 120B, two print blurs are present in 100 times and good, in the 2 nd modification in which the transfer auxiliary portion 320 is triangular, 0 print blur is present in 100 times and good, and in the 3 rd modification in which the transfer auxiliary portion 320 is square, 1 print blur is present in 100 times and good, in the embodiment of the present invention, the print blur can be reduced.

Claims

1. An intaglio plate having a cylindrical or columnar shape and a concave portion for holding a paste transferred to a sheet to be transferred on an outer peripheral surface of the intaglio plate,

inside the recess includes:

a vertical bank extending in a circumferential direction of the outer circumferential surface;

a horizontal bank having one end connected to a 1 st longitudinal bank among the longitudinal banks and the other end facing a 2 nd longitudinal bank extending adjacent to the 1 st longitudinal bank, extending substantially perpendicular to the 1 st longitudinal bank and not connected to the 2 nd longitudinal bank; and

and a transfer auxiliary unit provided at a top end of the other end of the horizontal bank.

2. The intaglio plate according to claim 1,

the transfer auxiliary portion includes a 1 st transfer auxiliary portion provided at the tip end and a 2 nd transfer auxiliary portion provided at a position closer to the one end side than the 1 st transfer auxiliary portion.

3. Intaglio plate according to claim 1 or 2, characterized in that,

the transfer auxiliary portion has a triangular cross section along the outer peripheral surface.

4. Intaglio plate according to claim 1 or 2, characterized in that,

the transfer auxiliary portion has a square cross section along the outer peripheral surface.

5. An intaglio printing press, characterized in that,

the gravure printing machine is provided with:

an intaglio plate having a cylindrical or columnar shape, the intaglio plate having a recessed portion provided on an outer peripheral surface thereof for holding a paste to be transferred to a sheet to be transferred, the recessed portion including, inside the recessed portion, a vertical bank extending in a circumferential direction of the outer peripheral surface, a horizontal bank having one end connected to a 1 st vertical bank of the vertical banks and the other end facing a 2 nd vertical bank side extending adjacent to the 1 st vertical bank and extending substantially perpendicular to the 1 st vertical bank and not connected to the 2 nd vertical bank, and a transfer assist portion provided at a tip of the other end of the horizontal bank;

a paste supply unit in which the paste is stored; and

and an impression cylinder that sandwiches the sheet to be transferred between the impression cylinder and the intaglio.