JP3964714B2 - Manufacturing method of laminated electronic component using gravure roll - Google Patents

Description

【００４５】
表１より、実施例１〜５のグラビアロールを用いて印刷を行うと、シート印刷面にスジ故障が発生するまでの時間が非常に長くなった。すなわち、ドクターブレードの耐久性が向上された。このように、スジ故障発生の防止が可能となり、ショート不良率が大幅に低減された。
【００４６】
本発明は、その精神または主要な特徴から逸脱することなく、他のいろいろな形態で実施することができる。そのため、前述の実施例はあらゆる点で単なる例示にすぎず、限定的に解釈してはならない。さらに、請求の範囲の均等範囲に属する変更は、すべて本発明の範囲内のものである。
【００４７】
【発明の効果】
本発明で用いられるグラビアロールによれば、ドクターブレードの耐久性向上用凹部、より具体的にはドクターブレードの刃先を研磨する機能を有する線状溝が外周面に形成されているので、ドクターブレードの耐久性が向上される。その結果、長時間の連続印刷を行っても、被印刷物にスジ状の印刷故障が起こらない。
【００４８】
上記グラビアロールを用いて内部電極用導電ペーストを印刷して積層電子部品を製造すると、長時間の連続印刷を行っても、導電ペーストの転写物であるスジ状の印刷故障が起こらない。そのため、本発明の方法により得られた積層電子部品では、ショート不良が起こることが極めて少ない。また、ドクターブレードが長時間の連続印刷に耐えられるので、頻繁に印刷機械を停止する必要がなくなり、製造工程上有利である。
上記グラビアロールは、積層電子部品製造におけるグラビア印刷に好適であるが、他の種々の目的のグラビア印刷に用いることも勿論可能である。
【図面の簡単な説明】
【図１】 グラビア印刷法の概略を示す図である。
【図２】 従来のグラビアロールの斜視図である。
【図３】 図２の従来のグラビアロール表面の展開図である。
【図４】 図３中のＡ部の拡大図である。
【図５】 スジ状印刷故障を説明するための被印刷物の平面図である。
【図６】 本発明のグラビアロールの一例の斜視図である。
【図７】 図６の本発明のグラビアロール表面の展開図である。
【図８】 図８（ａ）及び（ｂ）は、図７中のＢ部の拡大図であり、線状溝の詳細を示す図である。
【図９】 線状溝の別の例を示す図である。
【符号の説明】
(11)：グラビアロール
(18)：グラビア印刷版
(P) ：印刷領域
(N) ：非印刷領域
(12)：ドクターブレード耐久性向上用線状溝
(Pw)：印刷領域(P) の幅
(L12) ：線状溝(12)の幅[0001]
BACKGROUND OF THE INVENTION
The present invention is a gravure roll used in the gravure printing, detail Ri yo improves the durability of the doctor blade, a method of manufacturing multilayer electronic component using a gravure roll that streaky print failure the substrate does not occur About.
[0002]
[Prior art]
Conventionally, a gravure printing method is well known as a printing method. In order to manufacture multilayer electronic components such as multilayer capacitors, multilayer inductors, multilayer substrates, and LC chips, there is 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. JP-A-3-108307, JP-A-6-316174, JP-A-9-129503, and JP-A-9-129504.
[0003]
Printing of the conductive paste by the gravure printing method is performed as follows.
FIG. 1 is a diagram showing an outline of a gravure printing method, and FIG. 2 is a perspective view of a conventional gravure roll. Referring to FIGS. 1 and 2, 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 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 is scraped off by the doctor blade (4). It is done. The doctor blade (4) is usually arranged to scrape the conductive paste while swinging in the width direction of the gravure roll (1).
The conductive paste 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). Is done. In this way, the rectangular conductive paste (7) corresponding to the shape of the gravure printing plate (8) is printed on the ceramic green sheet (6).
[0004]
By the way, the conventional gravure roll (1) has a plurality of gravure printing plates (8) arranged in the width direction and circumferential direction of the gravure roll cylindrical body as shown in the development view of the surface of the gravure roll in FIG. The formed printing region (P) is usually formed in a plurality of regions at a predetermined interval in the roll circumferential direction.
In addition, each gravure printing plate (8) has a large number of concave portions (81) as shown in FIG. 4 (enlarged view of portion A in FIG. 3) in order to transfer the conductive paste into an accurate rectangular shape. It consists of an assembly.
[0005]
However, in the conventional gravure roll (1) on which the gravure printing plate (8) is thus formed, the cutting edge of the doctor blade (4) is damaged when continuous printing is performed for a long time. For this reason, between the gravure printing plates (8) to be completely scraped of the conductive paste (e.g., between the columns 8a and 8b in FIG. 3, between the columns 8b and 8c, The conductive paste remains on the surface of the gravure roll (between the steps 8a and 8d), and the remaining paste is transferred onto the ceramic green sheet (6). As a result, there is a disadvantage that a so-called streak-like printing failure occurs on a substrate such as a ceramic green sheet.
[0006]
FIG. 5 is a plan view of a substrate for explaining a streak-like printing failure, between conductive pastes (7) transferred to a ceramic green sheet (6) (for example, columns 7a and 7b in FIG. 5). Between the columns, between the columns 7b and 7c, between the columns 7a and 7d, etc.) Yes.
[0007]
In the case of manufacturing a multilayer ceramic capacitor, when such a streak-like printing failure occurs, there is a problem in that the streak-like conductive paste causes conduction between opposing electrodes, resulting in a short circuit failure.
[0008]
In order to prevent streak-like printing failures, it is necessary to frequently stop the printing machine, remove the doctor blade and polish its cutting edge, or replace the doctor blade with a new one, which causes problems in productivity. is there.
[0009]
[Problems to be solved by the invention]
An object of the present invention improves the durability of the doctor blade is to provide a method of manufacturing a multilayer electronic component using a gravure roll for gravure printing streaky print failure the substrate does not occur .
[0010]
[Means for Solving the Problems]
As a result of intensive studies, the inventors have formed a linear recess for improving the durability of the doctor blade on the outer surface of the gravure roll in the non-printing region located between the printing regions where a plurality of gravure printing plates are formed. As a result of the formation, the present inventors have found that streak-like printing failure does not occur even when continuous printing is performed for a long time, and the present invention has been completed.
[0015]
The present invention includes a plurality of printing regions in which a plurality of gravure printing plates are formed on a roll outer peripheral surface, and a plurality of non-printing regions (non-product regions) existing at positions in the roll circumferential direction different from the printing region. Are gravure rolls alternately in the roll circumferential direction ,
In the non-printing area, a recess for improving the durability of the doctor blade is formed,
The recess for improving durability is a linear groove having a length in the width direction of the roll,
Three or more linear grooves are formed in the non-printing area,
The linear groove is formed so that the position in the circumferential direction of the roll is intermittently shifted sequentially from one end face of the roll to the other end face , and the width of the printing area in which a plurality of gravure printing plates are formed. Is formed over a long roll width ,
Each of the linear grooves in each non-printing region is formed such that the position in the roll circumferential direction is intermittently shifted sequentially from the one end surface of the roll toward the other end surface in the roll rotation direction plus side. And a gravure printing process using a gravure roll that is formed so that the position in the roll circumferential direction is intermittently shifted to the negative side in the roll rotation direction. A method for manufacturing a laminated electronic component.
The linear groove preferably has a groove width of 5 to 75 μm.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
6 is a perspective view of an example of the gravure roll used in the present invention , and FIG. 7 is a development view of the surface of the gravure roll of FIG.
6 and 7, the gravure roll (11) outer peripheral surface, a plurality of print areas gravure printing plate (18) is formed (P) is, is more than areas formed at predetermined intervals in the roll circumferential direction ing. Further, in the example shown in the figure, one printing area (P) is configured by arranging eight rows of gravure printing plates (18) in the roll width direction and four stages in the circumferential direction. This arrangement may be appropriately selected by those skilled in the art according to the purpose of printing. The arrows in FIG. 7 indicate the rotation direction of the roll.
[0017]
The area in the roll circumferential direction other than the printing area (P) is a non-printing area (N), that is, the printing area (P) and the non-printing area (N) are alternately arranged in the roll circumferential direction. Has been.
In this non-printing region (N), a concave portion (12) for improving the durability of the doctor blade is formed.
[0018]
The recess for improving durability is formed as a linear groove (12) having a length in the width direction of the roll. Then, the linear groove (12) comprises, from one end face of the roll to the other end face, the position of the roll circumferential direction is formed to sequentially deviate in cross-sustaining. That is, in the developed view of FIG. 7, the groove (12) is formed on a straight line inclined with respect to a straight line parallel to the roll width direction.
[0019]
More description of this detail in FIG. FIGS. 8A and 8B are enlarged views of a portion B in FIG. 8 (a) and 8 (b), the groove structural unit (13) having the length (L13) in the roll width direction is continuously shifted in the roll width direction while being shifted by a distance (K) in the roll circumferential direction. As a result, a linear groove (12) is formed as a whole. The difference between (a) and (b) is that the distance (K) of the adjacent groove structural unit (13) deviating in the roll circumferential direction is different. In the linear grooves (12) shown in FIGS. 8A and 8B, the positions in the roll circumferential direction are intermittently shifted from one end face of the roll toward the other end face. More specifically, in the drawing, the position in the circumferential direction of the roll is formed so that the position in the circumferential direction of the roll is intermittently shifted to the minus side in the roll rotation direction as it proceeds from the right to the left.
FIG. 9 (reference drawing) is another example of the linear groove (12), and the groove is formed linearly. The position of the linear groove (12) in the circumferential direction of the roll is successively shifted sequentially from one end face of the roll toward the other end face.
[0020]
By forming such a linear groove (12) in the non-printing area (N) of the roll surface, the opening edge of the linear groove (12) is formed along with the rotation of the roll (11) during printing. As it progresses from one end surface of the roll to the other end surface, for example, from the right side to the left side in FIG. 7, it comes into continuous or intermittent contact with the doctor blade. Therefore, it is considered that the blade edge of the doctor blade is polished at the time of contact with the opening edge of the linear groove (12), and the durability of the doctor blade is improved.
[0021]
Due to the action of the linear grooves, the linear grooves (12) are formed over a roll width longer than the width (Pw) of the printing region (P) where a plurality of gravure printing plates are formed. The Ie, the width of the linear groove (L12)> width of the print area (Pw).
[0022]
The linear groove (12) depends on the material of the doctor blade, the blade installation angle with respect to the roll peripheral surface, the rotation speed of the roll, etc. It is preferable to have a groove width of ˜75 μm. The optimum groove width may be determined as appropriate by those skilled in the art. If the groove width is too large, the polishing action is reduced and it is difficult to obtain the desired effect.
[0023]
The linear grooves (12) are filled with paste and printed on the printed material, but the linear grooves (12) are formed in the non-printing area of the roll corresponding to the non-product areas that are not products of the printed material. Therefore, even if it is printed, the product is not affected.
[0024]
Further, three or more linear grooves (12) are formed in the non-printing region (N), and preferably, for example, about 3 to 10 are formed.
[0025]
In the developed view of FIG. 7, the linear groove (12) has a case of a line that is downwardly inclined to the right in the roll width direction and a case of an upwardly linear line. In the present invention, the linear groove (12) may be in any inclination direction. The gravure roll (11) has a plurality of non-printing areas (N), but in the adjacent non-printing areas (N), the linear grooves (12) have the same direction even if the inclination directions of the linear grooves (12) are reversed. It may be.
[0026]
The gravure roll used in the present invention is not particularly limited. For example, a gravure printing plate (18) or a linear groove (12) is engraved on the roll surface by a known chemical etching method, laser processing method, or the like. can do.
An outline of the chemical etching method will be described. For example, after copper plating is applied to the surface of the gravure roll, cylindrical polishing is performed to obtain a predetermined cylindricity (20 μm or less) and surface roughness. Thereafter, a UV photosensitive resin is applied, and a desired printing plate or linear groove pattern is baked. After washing away the resin in the portion that hits the recess, an etching solution such as ferric chloride solution is sprayed on the copper plating of the gravure roll to spray the copper and corrode the copper to create a desired recess. Thereafter, the surface is subjected to Cr plating finish to obtain a target gravure roll.
The UV photosensitive resin and the etching solution to be used can be used without any problem as long as they are generally used.
[0027]
According to the gravure roll used in the present invention , the durability of the doctor blade is improved although it is considered to be due to the polishing action. As a result, even when continuous printing is performed for a long time, unnecessary conductive paste on the surface of the roll is scraped off by the doctor blade, so that streak-like printing failure does not occur on the substrate.
[0028]
The method for manufacturing a laminated electronic component of the present invention includes a step of gravure printing a conductive paste on a dielectric or support using the gravure roll.
[0029]
According to this manufacturing method, even if continuous printing is performed for a long time, unnecessary conductive paste on the roll surface is completely scraped off by a doctor blade, so that the conductive paste is transferred onto a ceramic green sheet or other support. No streak-like printing failures occur.
Therefore, in the multilayer electronic component obtained by the method of the present invention, there is no inconvenience that the opposing electrodes are electrically connected by the stripe-shaped conductive paste, and short-circuit failure is extremely rare.
[0030]
【Example】
EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to these examples.
[0031]
[Example 1]
<Production of gravure roll>
This will be described with reference to FIGS.
A gravure roll (11) as shown in FIGS. 6, 7 and 8 was manufactured on a gravure roll having a diameter of 140 mm and a width of 130 mm by a chemical etching method.
The printing area (P) and non-printing area (N) are alternately arranged in five patterns, the length of the printing area (P) in the roll circumferential direction is 80 mm, and the length of the non-printing area (N) is 8 mm. . In the printing region (P), 6.8 mm × 1.3 mm gravure printing plates (18) were arranged in 35 rows in the roll width direction and 10 stages in the circumferential direction. The width (Pw) of the printing area (P) was 72 mm.
Three step-like linear grooves (12) shown in FIG. 8A were formed in each non-printing area (N). Length (L13) of groove structural unit (13): 1000 μm, width (W): 25 μm, deviation of adjacent groove structural unit (13) in roll circumferential direction (K): 25 μm, length of linear groove (L12): 90 mm. The linear groove (12) is defined as lowering to the right, rising to the right, falling to the right, rising to the right, and lowering to the roll width direction for each non-printing area (N).
[0032]
<Dielectric coating>
Powders of barium titanate, chromium oxide, yttrium oxide, manganese carbonate, barium carbonate, calcium carbonate, silicon oxide and the like having a particle size of about 0.1 to 1.0 μm were fired. The calcined powder, BaTiO ₃ as 100 mol%, 0.3 mol% in terms of Cr ₂ O _3, 0.4 mol% in terms of MnO, 2.4 mol% in terms of BaO, CaO 1.6 mol% in terms of conversion, 4 mol% in terms of SiO ₂ , and 0.1 mol% in terms of Y ₂ O ₃ , mixed by a ball mill for 24 hours, and dried. A dielectric material was obtained.
This dielectric material is mixed with 100 parts by weight of acrylic resin, 5 parts by weight of acrylic resin, 40 parts by weight of methylene chloride, 25 parts by weight of acetone, and 6 parts by weight of mineral spirit, and mixed with a commercially available φ10 mm zirconia bead for 24 hours. A derivative ceramic paint was obtained.
[0033]
<Green sheet molding>
The dielectric ceramic paint obtained as described above was applied to a flexible support that was continuously supplied by a doctor blade method to form a derivative green sheet layer having a thickness of 6.5 μm.
[0034]
<Internal electrode paste>
100 parts by weight of Ni particles having an average particle diameter of 0.8 μm, 27 parts by weight of an organic vehicle solution (15 parts by weight of ethyl cellulose resin dissolved in 85 parts by weight of terpineol) and 73 parts by weight of terpineol were mixed and dispersed to form a paste.
[0035]
<Internal electrode printing>
The Ni paste obtained as described above is subjected to the direct gravure printing method using the gravure roll formed with a plate having a predetermined size and pattern, and the internal electrode layer is formed to have the above dielectric material to a thickness of 1.5 μm. It printed on the green sheet, and it wound up continuously after drying. The printing speed at this time was 10 m / min. In this way, a dielectric sheet printed with internal electrodes of Example 1 was obtained.
[0036]
<Production of multilayer capacitor>
The obtained dielectric printed with internal electrodes is peeled off from the flexible support, and a laminate having a lamination number of 230 layers is obtained by a laminating machine. After thermocompression bonding, the laminate is cut to obtain the number of laminations of the internal electrode layers. A 230-layer green chip laminate was obtained. A protective layer was formed on each of the upper and lower portions of the outermost package in the stacking direction of the green chip stack using five 30 μm derivative green sheet layers.
The obtained green chip laminate was subjected to a binder removal treatment under a predetermined temperature condition according to a conventional method, then baked, and a terminal electrode was baked to form.
The binder removal and firing conditions have been well known in the past, and in this example, the binder was removed at 280 ° C. for 12 hours and fired at 1300 ° C. for 2 hours in a reducing atmosphere.
Terminal electrodes were formed on the laminate obtained after firing.
The material and forming method of the terminal electrode are also well known. For example, copper was used as a main component, and plating was performed by baking at 800 ° C. for 30 minutes in N ₂ + H ₂ .
Thus, the multilayer capacitor of Example 1 was produced.
[0037]
<Characteristic evaluation 1: Measurement of streak failure occurrence time>
After the start of printing, the internal electrode printed sheet continuously produced by the above gravure printing was visually confirmed, and the time until a streak failure occurred on the printing surface was measured.
[0038]
<Characteristic evaluation 2: Measurement of short-circuit defect rate>
A high resistance meter HP-4329A manufactured by Hewlett-Packard Company was used, 10 V was applied at 20 ° C., and measurement was performed after 30 seconds. Those having an insulation resistance of 1000Ω or less were regarded as short-circuit defects, and the ratio of the number of short-circuit defects occurring to the number of samples (1000) subjected to the test was displayed as the short-circuit defect rate.
For this measurement, a laminated sample produced by processing a printed sheet obtained between 2 hours and 4 hours after the start of printing was used.
[0039]
[Example 2]
Gravure roll in the same manner as in Example 1 except that the length (L13) of the groove structural unit (13) in the linear groove (12) is 500 μm, the width (W) is 25 μm, and the deviation (K) is 25 μm. Was made. Using this gravure roll, internal electrode printing was similarly performed to produce a multilayer capacitor.
[0040]
[Example 3]
A gravure roll was produced in the same manner as in Example 1, except that seven linear grooves (12) having the same shape as in Example 1 were formed in each of the five non-printing regions (N). Using this gravure roll, internal electrode printing was similarly performed to produce a multilayer capacitor.
. The linear groove (12) was right-down, up-right, down-right, up-right, down-right, up-right, and down-right with respect to the roll width direction.
[0041]
[Example 4]
Gravure roll in the same manner as in Example 1 except that the length (L13) of the groove structural unit (13) in the linear groove (12) is 1000 μm, the width (W) is 75 μm, and the deviation (K) is 25 μm. Was made. Using this gravure roll, internal electrode printing was similarly performed to produce a multilayer capacitor.
[0042]
[Example 5]
A gravure roll in the same manner as in Example 1 except that the length (L13) of the groove structural unit (13) in the linear groove (12) is 500 μm, the width (W) is 5 μm, and the deviation (K) is 5 μm. Was made. Using this gravure roll, internal electrode printing was similarly performed to produce a multilayer capacitor.
[0043]
[Comparative Example 1]
A gravure roll was produced in the same manner as in Example 1 except that no linear groove was formed in any of the non-printing areas (N). Using this gravure roll, internal electrode printing was similarly performed to produce a multilayer capacitor.
Table 1 shows the results of the characteristic evaluation of Examples 1 to 5 and Comparative Example 1.
[0044]
[Table 1]

[0045]
From Table 1, when printing was performed using the gravure rolls of Examples 1 to 5, the time until a streak failure occurred on the sheet printing surface was very long. That is, the durability of the doctor blade was improved. In this way, the occurrence of streak failure can be prevented, and the short-circuit defect rate is greatly reduced.
[0046]
The present invention can be implemented in various other forms without departing from the spirit or main features thereof. For this reason, the above-described embodiment is merely an example in all respects and should not be interpreted in a limited manner. Furthermore, all modifications belonging to the equivalent scope of the claims are within the scope of the present invention.
[0047]
【The invention's effect】
According to the gravure roll used in the present invention , the concave portion for improving the durability of the doctor blade, more specifically, the linear groove having the function of polishing the blade edge of the doctor blade is formed on the outer peripheral surface. Durability is improved. As a result, even if continuous printing is performed for a long time, streak-like printing failures do not occur on the substrate.
[0048]
When a laminated electronic component is manufactured by printing the internal electrode conductive paste using the gravure roll, a streak-like printing failure, which is a transfer product of the conductive paste, does not occur even if continuous printing is performed for a long time. For this reason, in the multilayer electronic component obtained by the method of the present invention, short-circuit defects rarely occur. In addition, since the doctor blade can withstand continuous printing for a long time, it is not necessary to frequently stop the printing machine, which is advantageous in the manufacturing process.
The gravure roll is suitable for gravure printing in the manufacture of laminated electronic components, but can of course be used for gravure printing for various other purposes.
[Brief description of the drawings]
FIG. 1 is a diagram showing an outline of a gravure printing method.
FIG. 2 is a perspective view of a conventional gravure roll.
FIG. 3 is a development view of the surface of the conventional gravure roll of FIG. 2;
FIG. 4 is an enlarged view of a portion A in FIG.
FIG. 5 is a plan view of a substrate for explaining a streak-like printing failure.
FIG. 6 is a perspective view of an example of a gravure roll according to the present invention.
FIG. 7 is a development view of the surface of the gravure roll of the present invention shown in FIG.
8 (a) and 8 (b) are enlarged views of a portion B in FIG. 7, showing details of the linear grooves.
FIG. 9 is a diagram showing another example of a linear groove.
[Explanation of symbols]
(11): Gravure roll
(18): Gravure printing plate
(P): Print area
(N): Non-printing area
(12): Linear groove for improving doctor blade durability
(Pw): Print area (P) width
(L12): Width of linear groove (12)

Claims (1)

A plurality of printing areas in which a plurality of gravure printing plates are formed on the outer circumferential surface of the roll, and a plurality of non-printing areas present at positions in the roll circumferential direction different from the printing area are alternately arranged in the roll circumferential direction. A gravure roll having
In the non-printing area, a recess for improving the durability of the doctor blade is formed,
The recess for improving durability is a linear groove having a length in the width direction of the roll,
Three or more linear grooves are formed in the non-printing area,
The linear groove is formed so that the position in the circumferential direction of the roll is intermittently shifted sequentially from one end face of the roll to the other end face , and the width of the printing area in which a plurality of gravure printing plates are formed. Is formed over a long roll width ,
Each of the linear grooves in each non-printing region is formed such that the position in the roll circumferential direction is intermittently shifted sequentially from the one end surface of the roll toward the other end surface in the roll rotation direction plus side. And a gravure printing process using a gravure roll that is formed so that the position in the roll circumferential direction is intermittently shifted to the negative side in the roll rotation direction. A method for manufacturing a laminated electronic component.

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