JP2009172949A - Gravure printing plate and method for producing laminated electronic component - Google Patents

Abstract

There is provided a gravure printing plate capable of performing printing with substantially no swell of a printing material on the back side of a printed figure. A method for producing a laminated electronic component using the gravure printing plate is provided.
A gravure printing plate surface is provided with a predetermined pattern, and is composed of a plurality of mesh-shaped recesses that are separated by a partition having the same height as the outer periphery of the gravure roll. The gravure printing plate is constructed by gradually reducing the area of the recesses in the minus direction.
[Selection] Figure 1

Description

  The present invention is a gravure printing for transferring a transfer material to a transfer target, particularly a gravure printing plate used for gravure printing a conductive paste on a dielectric sheet constituting a laminated electronic component, and formed using this gravure printing plate The present invention relates to a laminated electronic component including an internal electrode.

  With the recent development of electronics, the usage of multilayer electronic components, especially small electronic components, has greatly increased, and it is necessary to improve the production capacity of multilayer electronic components such as multilayer chip capacitors, multilayer inductors, multilayer substrates, and LC chips. It has become. For this purpose, it has been proposed to print internal electrodes by conventional screen printing by a gravure printing method capable of continuous high-speed printing. On the other hand, there is a great need for a smaller and larger capacity multilayer electronic component. In order to increase the size and capacity of the multilayer ceramic capacitor, it is conceivable to reduce the thickness of the dielectric and internal electrodes and increase the number of layers. It is also conceivable to increase the area of the internal electrodes and increase the overlapping area of the opposing internal electrodes.

  A method of forming an internal electrode by printing a conductive paste on a ceramic green sheet or other support by a gravure printing method is known.

  Printing of the conductive paste by the gravure printing method is performed as follows. FIG. 2 is a cross-sectional view showing an outline of the gravure printing method, and FIG. 3 is a perspective view of a gravure roll. 2 and 3, the gravure roll 1 has a cylindrical shape, and a plurality of gravure printing plates 8 are formed in a predetermined arrangement on the surface thereof. The gravure printing plate 8 has a rectangular concave shape that matches a desired electrode printing shape. The gravure roll 1 is rotated in the direction of the arrow in the figure, the conductive paste 3 is supplied from the paste tank 2 to the gravure printing plate 8, and the excess conductive paste 3 is scraped off by the doctor blade 4. The doctor blade 4 is usually disposed so as to scrape the conductive paste 3 while swinging in the width direction of the gravure roll 1. The conductive paste 3 filled in the gravure printing plate 8 is transferred onto the ceramic green sheet 6 when the ceramic green sheet 6 passes between the gravure roll 1 and the back roll 5. In this way, a rectangular conductive paste 7 corresponding to the shape of the gravure printing plate 8 is printed on the ceramic green sheet 6.

  By the way, if the entire area of the gravure printing plate 8 is constituted by a single recess, the conductive paste 7 cannot be transferred to an accurate rectangular shape. Therefore, conventionally, each gravure printing plate 8 is formed as an aggregate of a large number of concave portions.

  For example, FIG. 4A is a plan view showing a conventional gravure printing plate, and FIG. 4B is a cross-sectional view schematically showing the shape of a graphic printed using the gravure printing plate. In the gravure printing plate 11 of FIG. 4 (a), a large number of rectangular recesses 11a separated by diagonal partition walls in the vertical direction (roll circumferential direction) are arranged in a matrix. And the height of the slanted partition 11b is formed so that it may be located in the same height position as the surface of the gravure printing plate 11, that is, in the same plane as the outer surface of the gravure roll.

  When this gravure printing plate 11 is used, the conductive paste 3 is supplied to each recess 11a, and the excess conductive paste 3 is scraped off in the direction of the arrow in the figure by the doctor blade 4, and the conductive paste 3 filled in each recess 11a. Are respectively transferred to the support. After the transfer, the conductive paste 7 is leveled, and it is desired that the conductive paste 7 be printed in a rectangular shape that substantially matches the shape of the gravure printing plate 11. It is also desirable that the printed film thickness of the conductive paste 7 be uniform within the pattern.

  However, actually, as shown in FIG. 5, the conductive paste swells 22 to the rear side of the desired internal electrode 21. The reason is considered as follows.

  As described above, along with the rotation of the gravure roll 1, excess conductive paste 3 is scraped off by the doctor blade 4 in contact with the surface of the gravure roll 1 and transferred to the support. At this time, the conductive paste 3 filled in the concave portion 11a is not extruded and transferred perpendicularly to the support, but is transferred to the support by the surface tension of the conductive paste 3. With the rotation of 1, the paste flows in the negative direction of rotation, and the paste filled in the recesses is peeled off when it comes into contact with the unfilled projections. For this reason, the conductive paste swelled in the negative direction of rotation is printed.

  In the production of the multilayer ceramic capacitor, as shown in FIG. 5, after printing the internal electrode 21 on the ceramic green sheet 6, a predetermined number of layers are laminated, and after pressing, between the opposing electrodes (for example, the broken line in the figure) Cut in position) to obtain a predetermined multilayer capacitor green chip.

  Therefore, when the bulge 22 of the conductive paste 7 exists on the internal electrode 21, a non-uniform pressing pressure is applied between the ceramic and the internal electrode 21 during pressing, resulting in a non-uniformly bonded green chip. When this green chip is sintered, there is a problem that the interface between the ceramic and the internal electrode 21 is peeled off due to the stress at the time of sintering shrinkage between the ceramic and the internal electrode 21 and delamination occurs. In particular, this problem becomes more serious because the green sheet becomes harder as the density of the green sheet becomes higher, and it becomes difficult to absorb the swelling of the conductive paste 7.

For example, Patent Documents 1, 2, and 3 are known as prior art document information related to the invention of this application.
Japanese Patent Laid-Open No. 3-108307 JP-A-6-316174 JP-A-9-129504

  Therefore, the development of gravure printing technology that suppresses the swell of conductive paste as much as possible to obtain a ceramic capacitor that does not generate delamination while the density of ceramic green sheets is increasing in order to increase the size and capacity of multilayer ceramic capacitors. desired.

  Accordingly, an object of the present invention is to provide a gravure printing plate capable of performing printing in which the swell of the printing material on the back side of the printed figure is suppressed as much as possible. Moreover, the objective of this invention is providing the method of manufacturing a multilayer electronic component using the said gravure printing plate.

  The present invention provides a predetermined pattern on the surface of the gravure printing plate, and is composed of a plurality of mesh-shaped recesses arranged separated by a partition wall having the same height as the outer periphery of the gravure roll. The gravure printing plate is constructed by gradually reducing the area of the recesses in the minus direction.

  Further, according to the present invention, the gravure printing plate is constituted by a plurality of concave portions having the same shape arranged in a mesh shape in the printing pattern.

  Further, the present invention performs internal electrode printing of a multilayer electronic component using the gravure printing plate and using a conductive paste as a transfer product.

  Moreover, this invention comprises the internal electrode formed by apply | coating the electrically conductive paste which is a transcription | transfer material to the ceramic green sheet surface using the said gravure printing plate, and drying, and comprises a laminated electronic component.

  According to the gravure printing plate of the present invention, the conductive paste does not swell toward the rear side of the printed pattern by gradually reducing the area of the concave portion with respect to the negative direction of the roll circumference of the printing plate.

  Embodiments of the present invention will be described below with reference to the drawings. Fig.1 (a) is a top view which shows the outline of an example of the gravure printing plate formed in the gravure roll outer peripheral surface of this invention, FIG.1 (b) is the shape of the figure printed using this gravure printing plate. It is sectional drawing which shows this typically. The upper side in FIG. 1A is the plus side in the roll rotation direction, and the lower side is the roll rotation minus side.

  In FIG. 1A, 31 is a print pattern frame, 32 is a recess, 32a, 32b and 32c are recesses at predetermined positions of the print pattern frame 31, 41 is a conductive paste, Va is a recess 32a, and Vb is a recess 32b. , Vc is the transfer amount of the conductive paste 41 filled in the recess 32c.

  In the gravure printing plate, a plurality of rectangular recesses 32 are formed inside a predetermined printing pattern frame 31. This printing plate is placed on the surface of a gravure printing roll. The conductive paste 41 is filled in the recess 32 while rotating the gravure printing roll. The conductive paste 41 filled in a predetermined pattern is transferred to the surface of the support when the gravure printing roll comes into contact with the support such as the ceramic green sheet 6 to form a predetermined internal electrode pattern. .

  The printing pattern frame 31 is formed by applying a photoresist to a portion where the concave portion 32 of the gravure printing plate is not formed, and performing exposure, development, and etching.

Here, of the recesses 32 constituting the print pattern, the recesses 32a, the recesses 32b, and the recesses 32c are arranged in the order of the recesses 32a, the recesses 32b, and the recesses 32c in the negative direction of the roll circumference. Concave portion 32a> concave portion 32b> concave portion 32c
It is formed to satisfy the relationship. For example, the area of the recess 32a is 200 to 150 mesh, the area of the recess 32b is 250 to 200 mesh, and the area of the recess 32c is 250 to 300 mesh.

With such a structure, as shown in FIG. 1B, the transfer amounts Va, Vb, Vc of the conductive paste 41 by the recesses 32a, 32b, 32c are such that the viscosity and flowability of the paste from the recesses 32 are reduced. Regardless of the vertical extrusion from the recess 32, the transfer amount is
Va>Vb> Vc
The relationship holds.

  However, in gravure printing, there is a flow of the conductive paste in the minus direction of the roll circumference due to the rotation of the gravure roll and the viscosity of the paste, and the transfer amount of the conductive paste increases in the minus direction of the circumference in the print pattern.

For this reason, the gravure forming the structure has a smaller filling amount in the recesses as it goes in the negative direction of the roll circumference in the relationship Va>Vb> Vc. The transfer amount to a support such as a sheet is
Va = Vb = Vc
Thus, the swell of the internal electrode can be eliminated.

  Using the ceramic green sheet with internal electrodes formed as described above, a multilayer body is formed, cut individually, and then sintered to form a multilayer ceramic capacitor that does not cause delamination Can do.

  In the present embodiment, the shape of the concave portion 32 is a square shape. However, as long as all the shapes are the same, a rectangular shape, a diamond shape, a triangular shape, a circular shape, and the like may be used, and the angle with respect to the printing plate is also specified. Not a thing.

  In this invention, by using the gravure printing plate and using the conductive paste as a transfer material and printing the internal electrodes of the multilayer electronic component, the internal electrode thickness variation can be suppressed, and this is configured. Generation of delamination of the multilayer electronic component can be suppressed and stable supply can be achieved. The method of the present invention is suitable for gravure printing in the production of various laminated electronic components, but can of course be used for gravure printing for other various purposes, and is useful for various electronic devices.

(A) is a top view which shows the outline of an example of the gravure printing plate by embodiment of this invention, (b) shows typically the shape of the figure printed using the gravure printing plate of (a). Cross section Sectional drawing which shows the outline of the conventional gravure printing method The perspective view which shows the outline of the conventional gravure roll (A) is a top view which shows the conventional gravure printing plate, (b) is sectional drawing which shows typically the shape of the figure printed using the gravure printing plate of (a) Print body shape sectional view showing the print body shape of the process in the gravure printing process

Explanation of symbols

6 Ceramic green sheet 31 Print pattern frame 32, 32a, 32b, 32c Recess 41 Conductive paste Va, Vb, Vc Transfer amount

Claims (5)

In a gravure printing plate used for gravure printing in which a predetermined pattern is provided on a plate surface, a transfer product is filled in the pattern, and the transfer product is transferred to a dielectric or a support, the printing plate includes a gravure roll outer peripheral portion and A gravure printing plate comprising a plurality of mesh-shaped recesses arranged by being separated by a partition wall having the same height, and the area of the recesses gradually decreases in the minus direction of the circumference of the roll. . 2. The gravure printing plate according to claim 1, wherein the pattern is composed of three or more types of recess areas equally with respect to the length in the roll circumferential direction. The gravure printing plate according to claim 1, wherein the pattern is composed of a plurality of concave portions having the same shape arranged in a mesh shape. The gravure printing plate according to claim 1, wherein the transferred product is a conductive paste that forms an internal electrode of a laminated electronic component. In a gravure printing plate used for gravure printing in which a predetermined pattern is provided on a plate surface, a transfer product is filled in the pattern, and the transfer product is transferred to a dielectric or a support, the printing plate includes a gravure roll outer peripheral portion and Using a gravure printing plate, which is composed of a plurality of mesh-shaped recesses arranged separated by a partition wall of the same height, and the area of the recesses gradually decreases in the circumferential direction of the roll A method for manufacturing a laminated electronic component, comprising: a step of gravure printing a conductive paste on a dielectric or support; and a step of forming an internal electrode by baking the printed conductive paste.

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