CN217197337U - Gravure plate and gravure printing machine - Google Patents

Abstract

The utility model provides an intaglio and intaglio printing machine, this intaglio to set up the clearance and make the structure that the adjacent unit is local intercommunication each other in the direction of transfer at the horizontal dyke can further improve the homogeneity of the volume of paste in the concave part. The recessed plate (2) has a cylindrical or columnar shape, and a recessed portion (13) for holding a paste (12) transferred to a sheet (3) to be transferred is provided on the outer peripheral surface of the recessed plate, wherein the recessed portion includes, inside: a vertical dike (15) extending along the circumferential direction of the outer circumferential surface; a horizontal bank (16) having one end connected to the 1 st of the longitudinal banks and the other end extending toward the 2 nd longitudinal bank side extending adjacent to the 1 st longitudinal bank and not connected to the 2 nd longitudinal bank; and a transfer auxiliary section (20) provided at the tip of the other end of the lateral bank, the contour of the tip side of the transfer auxiliary section being a wave shape in which curved concave sections and convex sections are repeatedly formed in a cross section along the outer peripheral surface of the depressed plate.

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 a vertical bank extending in the transfer direction of the sheet to be transferred and a horizontal bank 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 document

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

SUMMERY OF THE UTILITY MODEL

Problem to be solved by utility model

The purpose of the present invention is to provide an intaglio and an intaglio printing press capable of further improving the uniformity of the amount of paste in a concave portion in a structure in which a gap is provided between horizontal banks to partially communicate adjacent cells in a transfer direction.

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 extending toward a 2 nd longitudinal bank side extending adjacent to the 1 st longitudinal bank and not connected to the 2 nd longitudinal bank; and a transfer auxiliary section provided at a distal end of the other end of the lateral bank, wherein a contour of the distal end side of the transfer auxiliary section is a wave shape in which curved concave portions and convex portions are repeatedly formed in a cross section along an outer peripheral surface of the depressed plate.

The bank may include: a 1 st horizontal bank having one end connected to the 1 st vertical bank and the other end extending toward the 2 nd vertical bank and not connected to the 2 nd vertical bank; and a 2 nd bank having one end connected to the 2 nd longitudinal bank and the other end extending toward the 1 st longitudinal bank and not connected to the 1 st longitudinal bank, wherein the transfer auxiliary unit includes a 1 st transfer auxiliary unit provided in the 1 st bank and a 2 nd transfer auxiliary unit provided in the 2 nd transverse bank, and the 1 st transverse bank and the 2 nd transverse bank overlap each other over a predetermined length in an axial direction of the depressed plate.

The bank may include: a 1 st horizontal bank having one end connected to the 1 st vertical bank and the other end extending toward the 2 nd vertical bank and not connected to the 2 nd vertical bank; and a 2 nd horizontal bank having one end connected to the 2 nd vertical bank and the other end extending toward the 1 st vertical bank and not connected to the 1 st vertical bank, wherein the transfer auxiliary unit includes a 1 st transfer auxiliary unit provided in the 1 st horizontal bank and a 2 nd transfer auxiliary unit provided in the 2 nd horizontal bank, and a space having a predetermined width is provided in an axial direction of the depressed plate between the 1 st transfer auxiliary unit and the 2 nd transfer auxiliary unit.

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 onto 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 extending toward a 2 nd vertical bank side extending adjacent to the 1 st vertical bank and not connected to the 2 nd vertical bank, and a transfer assist portion provided at a top end of the other end of the horizontal bank, a contour of the top end side having a waveform shape in which curved recessed portions and raised portions are repeatedly formed in a cross section along the outer peripheral surface of the intaglio plate; 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, it is possible to provide an intaglio and an intaglio printing press capable of further improving the uniformity of the amount of paste in the concave portion in a structure in which the horizontal banks are provided with gaps so that adjacent cells in the transfer direction are partially communicated with each other.

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 partially enlarged view of a modification of the inner region.

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, 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 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.

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 recess 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)

A start end groove 13F and a start end groove 13E, which are two start end grooves extending in the axial direction Y, are provided independently of the concave portion 13 at a position closer to the transfer start end side than 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 the vertical bank 15D will be described as a vertical bank 15D when it is not necessary to distinguish between the 1 st vertical bank 15Da and the 2 nd vertical bank 15Db, and the horizontal bank 16D will be described as a horizontal bank 16D when it is not necessary to distinguish between the 1 st horizontal bank 16Da and the 2 nd horizontal bank 16 Db.

(Dike structure)

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 1 st transfer auxiliary unit 20a and the 2 nd transfer auxiliary unit 20b have the same shape, and the 1 st transfer auxiliary unit 20a and the 2 nd transfer auxiliary unit 20b will be collectively described as the transfer auxiliary unit 20 unless the first transfer auxiliary unit 20a and the 2 nd transfer auxiliary unit 20b are distinguished from each other.

The transfer auxiliary portion 20 is a portion for ensuring a further transfer starting point, and the width in the circumferential direction (transfer direction X) thereof is at least wider than the width of the horizontal bank 16D, and is preferably 20% or more and 32% or less of the distance between the 1 st horizontal bank 16Da and the 2 nd horizontal bank 16 Db.

In the embodiment, the cross section of the transfer auxiliary section 20 along the outer peripheral surface of the depressed plate 2 is substantially rectangular in shape having a longitudinal direction in the transfer direction X. The contour of the tip end side is a wave shape in which smooth curved concave portions and convex portions are repeatedly formed in a cross section along the outer peripheral surface.

In the wave shape of the transfer assisting section 20, the curve on the right side in fig. 5 of the transfer direction X, i.e., the start end side, is gentler than the curve on the left side in fig. 5 of the transfer direction X, i.e., the end side. That is, the wave shape of the transfer auxiliary section 20 is a shape in which the convex portion is shifted toward the rear end side in the transfer direction X. The curvature of the concave portion and the curvature of the convex portion may be the same.

The 1 st horizontal bank 16Da and the 2 nd horizontal bank 16Db overlap each other over a range Y1 of a predetermined length in the axial direction Y shown in fig. 5.

The ratio of the length obtained by adding the horizontal banks 16D and the transfer auxiliary unit 20 to the distance between the vertical banks 15D in the axial direction Y is preferably 50% or more and less than 80%, and more preferably 60% or more and 70% or less.

(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 portions of two diagonally opposite 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 recess 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 width of the transfer auxiliary section 20 in the transfer direction X is wider than the width of the lateral banks 16 in the transfer direction X. Therefore, the transfer assist unit 20 can supplement the transfer starting point, and thus the transfer starting point can be sufficiently ensured, and the occurrence of blur can be reduced.

When the recessed plate 2 is rotated to be separated from the ceramic green sheet 3, the conductive paste 12 is drawn so as to connect the ceramic green sheet 3 and the recessed plate 2. The filaments of the conductive paste 12 travel in the transfer direction (printing direction) X during printing. In the embodiment, the profile of the transfer auxiliary unit 20 on the tip side is a wave shape in which smooth curved concave portions and convex portions are repeatedly formed in a cross section along the outer peripheral surface. Therefore, the yarn is printed while swinging in the axial direction Y while traveling in the transfer direction (printing direction) X. This further improves the uniformity of the printed conductive paste 12.

In the wave shape of the transfer auxiliary unit 20, the curve on the leading end side in the transfer direction X is gentler than the curve on the trailing end side in the transfer direction X. Therefore, the conductive paste 12 flows smoothly when flowing in the transfer direction X in the gap 18, and turbulence of the flow is not easily generated.

Further, the 1 st horizontal bank 16Da and the 2 nd horizontal bank 16Db overlap each other over a range Y1 of a predetermined length in the axial direction Y shown in fig. 5.

Therefore, the length of the 1 st horizontal bank 16Da and the 2 nd horizontal bank 16Db can be made longer, so that the transfer starting point can be formed in a large amount and the flow rate of the conductive paste 12 in the transfer direction can be reduced, thereby ensuring the uniformity of the thickness of the transferred conductive paste 12.

(Experimental example)

Here, a plurality of depressed plates 2 having different bank shapes in the inner region of the depressed portion 13 are prepared, 100 inner electrodes are printed by depressed plate printing using each depressed plate 2, and whether or not there is a print blur is observed with an optical microscope. The results are shown in the following table. In the table, 25 or more out of 100 pieces were judged as "x", 10 or more and less than 25 pieces were judged as "Δ", 1 or more and less than 10 pieces were judged as "excellent", and 0 piece was judged as "excellent".

In comparative example 1, the transfer auxiliary unit 20 and the horizontal banks 16D are not provided, and only the vertical banks 15D are provided.

Comparative example 2 is a case where the transfer auxiliary unit 20 is not provided and the vertical banks 15D and the horizontal banks 16D are provided.

In examples 1 to 6, the ratio of the length of the transfer auxiliary unit 20 in the transfer direction (circumferential direction) X to the distance between the lateral banks 16D was about 35%, but the ratio of the length obtained by adding the lateral banks 16D and the transfer auxiliary unit 20 to the distance between the vertical banks 15D in the axial direction Y was different.

In example 1, the ratio of the length obtained by adding the horizontal banks 16D and the transfer auxiliary unit 20 to the distance between the vertical banks 15D in the axial direction Y was 40%.

Example 2 is a case where the ratio of the length obtained by adding the horizontal banks 16D and the transfer auxiliary section 20 to the distance between the vertical banks 15D in the axial direction Y is 50%.

Example 3 is a case where the ratio of the length obtained by adding the horizontal banks 16D and the transfer auxiliary unit 20 to the distance between the vertical banks 15D in the axial direction Y is 60%.

In example 4, the ratio of the length obtained by adding the horizontal banks 16D and the transfer auxiliary unit 20 to the distance between the vertical banks 15D in the axial direction Y was 70%.

In example 5, the ratio of the length obtained by adding the horizontal banks 16D and the transfer auxiliary unit 20 to the distance between the vertical banks 15D in the axial direction Y was 80%.

In example 6, the ratio of the length obtained by adding the horizontal banks 16D and the transfer auxiliary unit 20 to the distance between the vertical banks 15D in the axial direction Y was 90%.

In examples 7 to 10, the ratio of the length obtained by adding the horizontal banks 16D and the transfer auxiliary section 20 to the distance between the vertical banks 15D in the axial direction Y was 75%, but the ratio of the length of the transfer auxiliary section 20 in the transfer direction (circumferential direction) X to the distance between the horizontal banks 16D was different.

In example 7, the ratio of the length of the transfer auxiliary unit 20 in the transfer direction (circumferential direction) X to the distance between the lateral banks 16D was about 15%.

Example 8 is a case where the ratio of the length of the transfer auxiliary section 20 in the transfer direction (circumferential direction) X to the distance between the lateral banks 16D is about 20%.

Example 9 is a case where the ratio of the length of the transfer auxiliary section 20 in the transfer direction (circumferential direction) X to the distance between the lateral banks 16D is about 32%.

Example 10 is a case where the ratio of the length of the transfer auxiliary section 20 in the transfer direction (circumferential direction) X to the distance between the lateral banks 16D is about 40%.

As shown in the table above, in comparative example 1 having only the vertical banks 15D, 36 out of 100 had print blur, and x, and in comparative example 2 having only the vertical banks 15D and the horizontal banks 16D, 25 out of 100 had print blur, and x, and print blur occurred at a considerable rate.

On the other hand, in example 1 in which the ratio of the length obtained by adding the horizontal banks 16D and the transfer auxiliary section 20 to the distance between the vertical banks 15D in the axial direction Y was 40%, 12 out of 100 had print blur and was Δ, and print blur could be reduced to some extent.

In example 2 in which the ratio of the length obtained by adding the horizontal banks 16D and the transfer auxiliary section 20 to the distance between the vertical banks 15D in the axial direction Y is 50%, two out of 100 pieces are good and are good, in example 3 in which the ratio is 60% and in example 4 in which the ratio is 70%, 0 out of 100 pieces are good and are excellent, and in example 5 in which the ratio is 80%, 5 out of 100 pieces are good and are excellent, and it is possible to reduce the print blur considerably.

In example 5 in which the ratio of the length obtained by adding the horizontal banks 16D and the transfer auxiliary unit 20 to the distance between the vertical banks 15D in the axial direction Y was 90%, 16 out of 100 had print blur, and the value was Δ, and print blur could be reduced to some extent.

According to the above, the following components are obtained: the ratio of the length obtained by adding the horizontal banks 16D and the transfer auxiliary section 20 to the distance between the vertical banks 15D in the axial direction Y is preferably 50% or more and less than 80%, and more preferably 60% or more and 70% or less. When the length obtained by adding the lateral banks 16D and the transfer auxiliary unit 20 is 90% or more, the fluidity of the conductive paste 12 is deteriorated, and the print blur increases.

In example 7 in which the ratio of the length of the transfer auxiliary unit 20 in the transfer direction (circumferential direction) X to the distance between the lateral banks 16D was about 15%, 13 out of 100 had print blur, and the print blur was Δ, and could be reduced to some extent.

In example 8 in which the ratio of the length of the transfer auxiliary portion 20 in the transfer direction (circumferential direction) X to the distance between the lateral banks 16D is about 20%, two out of 100 pieces have print blur and are good, and in example 9 in which the ratio is about 32%, two out of 100 pieces have print blur and are good, and print blur can be considerably reduced.

In example 10 in which the ratio of the length of the transfer auxiliary unit 20 in the transfer direction (circumferential direction) X to the distance between the lateral banks 16D was about 20%, 24 out of 100 had print blur, and the print blur was Δ, and could be reduced to some extent.

From the above, it can be seen that: the ratio of the transfer direction length of the transfer auxiliary section 20 to the distance between the lateral banks 16D is preferably 20% to 32% of the distance between the lateral banks 16D. When the ratio is less than 20%, the effect of the transfer auxiliary unit 20 on the formation of the waves becomes weak, and when the ratio is greater than 32%, the fluidity of the conductive paste 12 is deteriorated, so that print blur increases.

In addition, 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 depressed 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 bank 15 and the horizontal bank 16, but is provided with a contour groove 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 regions on both sides of the recess 13 in the axial direction Y are smaller than the cells 17(17D) located in the inner region of the recess 13, the "saddle phenomenon" is less likely to 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 each other through 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 example)

Fig. 6 is a diagram illustrating a transfer assist section 120 according to a modification. In the above embodiment, the 1 st horizontal bank 16Da and the 2 nd horizontal bank 16Db overlap each other over a range Y1 of a predetermined length in the axial direction Y shown in fig. 5. However, as shown in fig. 6, the 1 st horizontal bank 16Da and the 2 nd horizontal bank 16Db may not overlap each other, and a space of a predetermined length Y2 in the axial direction Y may be provided between the 1 st transfer auxiliary unit 20a and the 2 nd transfer auxiliary unit 20 b.

The structure of this modification also improves the uniformity of the conductive paste 12 by stirring the conductive paste 12.

Claims (4)

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

the inside of 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 extending toward a 2 nd longitudinal bank side extending adjacent to the 1 st longitudinal bank and not connected to the 2 nd longitudinal bank; and

and a transfer auxiliary section provided at a distal end of the other end of the lateral bank, wherein a contour of the distal end side of the transfer auxiliary section is a wave shape in which curved concave portions and convex portions are repeatedly formed in a cross section along an outer peripheral surface of the depressed plate.

2. The intaglio plate according to claim 1,

the horizontal dike includes: a 1 st horizontal bank having one end connected to the 1 st vertical bank and the other end extending toward the 2 nd vertical bank and not connected to the 2 nd vertical bank; and a 2 nd horizontal bank having one end connected to the 2 nd vertical bank and the other end extending toward the 1 st vertical bank side and not connected to the 1 st vertical bank,

the transfer auxiliary part comprises a 1 st transfer auxiliary part arranged on the 1 st horizontal bank and a 2 nd transfer auxiliary part arranged on the 2 nd horizontal bank,

the 1 st and 2 nd banks overlap over a predetermined length in the axial direction of the depressed plate.

3. The intaglio plate according to claim 1,

the horizontal dike includes: a 1 st horizontal bank having one end connected to the 1 st vertical bank and the other end extending toward the 2 nd vertical bank and not connected to the 2 nd vertical bank; and a 2 nd horizontal bank having one end connected to the 2 nd vertical bank and the other end extending toward the 1 st vertical bank side and not connected to the 1 st vertical bank,

the transfer auxiliary portion comprises a 1 st transfer auxiliary portion arranged on the 1 st horizontal bank and a 2 nd transfer auxiliary portion arranged on the 2 nd horizontal bank,

an interval of a predetermined width is provided in an axial direction of the depressed plate between the 1 st transfer auxiliary portion and the 2 nd transfer auxiliary portion.

4. 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 onto 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 extending toward a 2 nd vertical bank side extending adjacent to the 1 st vertical bank and not connected to the 2 nd vertical bank, and a transfer assist portion provided at a top end of the other end of the horizontal bank, a contour of the top end side having a waveform shape in which curved recessed portions and raised portions are repeatedly formed in a cross section along the outer peripheral surface of the intaglio plate;

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.

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