JP2007296861A - Gravure roll, gravure printer, and manufacturing method for laminated ceramic electronic part - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gravure printer which can form a conductive paste film being excellent in smoothness by a gravure printing. <P>SOLUTION: A plurality of cells 17 which are partitioned by a printing directional bank 15 and a vertical directional bank 16 are formed in a pixel section 13 which is formed on the peripheral surface of this gravure roll, and a plurality of vertical directional notches 18 are provided on the vertical directional bank 16. Then, at the central section of the pixel section 13, a gap G between the vertical directional notches 18 is made larger than each width W of the printing directional bank 15 and the vertical directional bank 16. Preferably, the opening areas of the cells 17 which are located on the peripheral edge section of the pixel section 13 are made smaller than the opening areas of the cells 17 which are located at the central section. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a gravure roll, a gravure printing machine equipped with a gravure roll, and a method for manufacturing a multilayer ceramic electronic component implemented using the gravure printing machine, and in particular, improves the smoothness of a paste film formed by gravure printing. It is related to the technology to make it.

  In order to manufacture a multilayer ceramic electronic component such as a multilayer ceramic capacitor, for example, a step of forming a conductive paste film serving as an internal electrode on a ceramic green sheet is performed. The internal electrode provided by the conductive paste film is required to have high pattern accuracy. Gravure printing has attracted attention as a technique that can satisfy this requirement (see, for example, Patent Document 1).

  In patent document 1, in order to equalize the thickness in the outer peripheral part of the paste film formed by the gravure printing, it forms in the image line part to which the printing paste is provided, which is formed on the peripheral surface of the gravure roll. For a plurality of cells, the cell opening area in the outer peripheral portion is made smaller than the cell opening area in the central portion, and the cell depth in the outer peripheral portion is made shallower than the cell depth in the central portion. Things are listed.

  However, since the cells described in Patent Document 1 are independent of each other in the image area, the ratio of the area of the cell portion to the area of the entire image area is relatively low. In some cases, the flow of printing paste between adjacent cells cannot occur, so that it is particularly unsuitable for printing to form a paste film having a relatively large area, and uneven printing tends to occur.

Although it is not intended to be applied in the field of electronic components as a solution to the above-described problem, a bank defining a plurality of cells formed in the image line portion extends obliquely with respect to the printing direction. In order to place the cells in a communication state between adjacent ones, a structure in which a notch is provided in the bank that partitions each cell has been proposed (see, for example, Patent Document 2).
JP-A-9-76459 Japanese Utility Model Publication No. 5-41015

  According to the technique described in Patent Document 2 described above, the ratio of the area of the area (that is, the cell and the notch) that can hold the printing paste to the area of the entire image portion can be increased, and through the notch. The flow of printing paste can be expected.

  However, in the technique described in Patent Document 2, since the notch interval is made smaller than the width of the bank, when a printing paste having a relatively high viscosity such as a conductive paste is used, the printing paste is adjacent to the printing paste. Flow between matching cells is limited. As a result, traces of cells may remain in the printed paste film, or a smooth paste film may not be formed.

  Further, in the technique described in Patent Document 2, the bank that defines the plurality of cells formed in the image line portion is arranged so as to extend obliquely with respect to the printing direction. So-called stringing of the printing paste when leaving the roll occurs in an oblique direction with respect to the printing direction, that is, the moving direction of the peripheral surface of the gravure roll, and local unevenness tends to occur in the peripheral shape of the printed paste film.

  Further, even if the above-described stringing occurs in an oblique direction with respect to the printing direction, the direction is not constant, and therefore the printing pastes in the stringing state may overlap each other. This causes variations in the thickness of the paste film.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a gravure roll, a gravure printing machine, and a method for manufacturing a multilayer ceramic electronic component implemented using the gravure roll, which can solve the above-described problems.

  The present invention is first directed to a gravure printing machine for forming a patterned internal electrode forming a part of a multilayer structure provided in a multilayer ceramic electronic component or a paste film to be a ceramic layer on a printing sheet by gravure printing. It is done.

  This gravure printing machine includes a gravure roll on a circumferential surface of which an image line portion to which a printing paste made of a conductive paste or a ceramic slurry for providing a paste film is applied is provided, and a sheet to be printed on the gravure roll. And an impression cylinder facing each other.

  The gravure printing machine having such a configuration is characterized by having the following configuration in order to solve the technical problems described above.

  That is, the image line portion is provided with a printing direction bank extending substantially in the printing direction and a vertical bank extending substantially perpendicular to the printing direction bank, and is partitioned by the printing direction bank and the vertical bank. A plurality of cells are formed. In order to make the cells communicate with each other, the vertical bank is provided with a vertical cutout, and the printing bank is arranged so as to cross the vertical cutout, and the center of the image area The section is characterized in that the interval between the vertical cutouts is larger than the widths of the printing bank and the vertical bank.

  As described above, the direction in which the printing direction bank extends is substantially the printing direction, and the direction in which the vertical bank extends is substantially perpendicular to the printing direction bank, respectively, the printing direction and the vertical direction, respectively. This is because there is an allowable range of about ± 5 degrees.

  It is preferable that the printing direction bank is provided so as to continuously extend from the vicinity of the printing start end to the vicinity of the printing end in the image portion. The fact that the bank in the printing direction extends continuously from the vicinity of the printing start end to the vicinity of the printing end means that, for example, a groove may be formed at the printing start end or the printing end.

  The vertical cutouts adjacent to each other with respect to the printing direction are preferably different in position in the vertical direction with respect to the printing direction.

  About each opening area of a some cell, it is preferable that the cell located in the peripheral part of an image line part is made small compared with the cell located in the center part of an image line part.

  In the first specific embodiment of the gravure printing press according to the present invention, each printing direction bank extends continuously in the image line portion, and each vertical direction bank is positioned in contact with the printing direction bank. And the one located through the vertical notch with respect to the bank in the printing direction are alternately arranged with respect to the printing direction, and the vertical notch is located at the two corners facing each other in the diagonal direction of each cell. is doing.

  In the first embodiment described above, it is preferable that at least one start end groove extending in a direction perpendicular to the print direction is provided on the print start end side of the image line portion independently of the cell.

  In the first embodiment, it is preferable that no vertical notch is formed on each outer side of the outermost bank in the printing direction.

  In a second specific embodiment of the gravure printing machine according to the present invention, the printing direction bank is provided with a plurality of printing direction notches so that each printing direction bank has the printing direction notch interposed. It is made to extend intermittently. Further, a vertical bank is arranged so as to cross the print direction cutout, and a vertical cutout or a print direction cutout is located at each corner portion of each cell.

  In the second embodiment described above, it is preferable that the opening area of the cell located on the printing start end side and the cell located on the printing end side of the image portion is the same.

  In the gravure printing machine according to the present invention, it is preferable that the image line portion is provided with a contour groove having a constant width that defines at least a part of the contour.

  The plurality of cells preferably have the same depth.

  In addition, the size of the image portion in the circumferential direction of the gravure roll is preferably smaller than the nip width given by the gravure roll and the impression cylinder.

  The present invention is also directed to a method for manufacturing a multilayer ceramic electronic component in which a step of forming a paste film to be an internal electrode or a ceramic layer patterned using a gravure printing machine as described above is performed.

  In the case described above, the above-mentioned printing sheet is preferably a ceramic green sheet.

  The present invention further provides a gravure printing machine for forming a patterned internal electrode forming a part of a multilayer structure provided for a multilayer ceramic electronic component or a paste film to be a ceramic layer on a printing sheet by gravure printing. Prepared for gravure rolls. In the gravure roll according to the present invention, an image line portion to which a printing paste made of a conductive paste or a ceramic slurry for providing a paste film is applied is formed on the peripheral surface, and the image line portion is substantially in the printing direction. An extending printing bank and a vertical bank extending substantially perpendicular to the printing bank are provided, and a plurality of cells defined by the printing bank and the vertical bank are formed, and the cells are adjacent to each other. The vertical bank is provided with a vertical notch to communicate with each other, and the printing bank is arranged so as to cross the vertical notch. The interval between the cutouts is characterized by being larger than each width of the printing bank and the vertical bank.

  As described above, according to the gravure printing machine according to the present invention, the image line portion formed on the peripheral surface of the gravure roll is provided with the printing direction bank and the vertical direction bank, and the printing direction bank and the vertical direction. A vertical bank is provided with a vertical notch in order to make a plurality of cells separated by a bank communicate with each other, and a vertical cut is provided at the center of the image area. Since the gap between the notches is larger than the widths of the printing direction bank and the vertical direction bank, the printing paste flows well between adjacent cells even when a relatively high viscosity printing paste is used. Can do. In other words, in addition to increasing the width of the notch, reducing the width of the bank shortens the distance that must be moved to pass the notch, so the printing paste can easily pass through the notch. Thus, the printing paste can flow well between adjacent cells. As a result, the thickness of the paste film formed by gravure printing can be made uniform.

  Further, since the bank in the printing direction extends substantially in the printing direction, the stringing of the printing paste when the substrate is separated from the gravure roll does not occur in an oblique direction with respect to the printing direction. This also contributes to make the thickness of the paste film formed by gravure printing uniform.

  In the gravure printing machine according to the present invention, when the printing direction bank is provided so as to continuously extend from the vicinity of the printing start end to the vicinity of the printing end in the image portion, the printing paste is surrounded by the printing direction bank. Since it flows in the printing direction only within the range, the effect of suppressing the occurrence of unevenness on the surface of the paste film is great. Therefore, the thickness of the paste film formed by gravure printing can be made more uniform.

  Also, if the vertical cutouts adjacent to each other in the printing direction are different from each other in the vertical direction with respect to the printing direction, the excess printing paste on the peripheral surface of the gravure roll is scraped off by the blade. In addition, undesirably, the printing paste that should remain in each cell is scraped off, and therefore, it is possible to advantageously prevent the paste film from being partially thinned. Further, the stringing of the printing paste when the substrate is separated from the gravure roll continuously proceeds via the vertical cutout. Therefore, when the positions of the vertical notches adjacent to each other are shifted in the direction perpendicular to the printing direction as described above, unevenness on the surface of the paste film that may be caused by stringing of the printing paste is suppressed. be able to.

  In general, when a paste film is formed by applying gravure printing, a so-called “saddle phenomenon” in which the peripheral portion of the paste film becomes thicker than the central portion is likely to occur. When a multilayer ceramic electronic component is manufactured using a conductive paste film in which such a “saddle phenomenon” has occurred, a short circuit failure or a structural defect may be caused. In the gravure printing machine according to the present invention, if the cell located at the peripheral portion of the image line portion has a smaller opening area than the cell located at the center portion of the image line portion, The phenomenon can be made difficult to occur.

  Further, in the present invention, each printing direction bank extends continuously in the image line portion, and each vertical direction bank is located in contact with the printing direction bank and is notched in the vertical direction with respect to the printing direction bank. Pasted by the gravure printing, when the vertical notches are positioned at the two corners opposite to each other in the diagonal direction of each cell. Local unevenness is hardly generated in the edge shape of the film, and the smoothness of the paste film can be further improved.

  In the above-described embodiment, when at least one start line extending in a direction perpendicular to the print direction is provided on the print start end side of the image line portion independently of the cell, the print start end side of the paste film It is possible to make it difficult to cause blurring and lack of thickness.

  Further, in the gravure printing machine according to the present invention, when a contour groove having a constant width that defines a part of the contour is provided in the image line portion, a straight line of the outer contour of the paste film formed by gravure printing Can be improved.

  Also, if each of the plurality of cells formed in the image area has the same depth, the thickness of the paste film formed by gravure printing is governed by the opening area of each cell. Therefore, the thickness of the paste film can be easily controlled by the opening area of each cell.

  Further, when the size of the image line portion in the circumferential direction of the gravure roll is made smaller than the nip width given by the gravure roll and the impression cylinder, the entire image line portion is in contact with the printing sheet in the printing process. Therefore, it is possible to uniformly transfer the printing paste to the printing sheet, and to make it difficult to cause blur due to such a shortage of transfer amount.

  From the above, when applied to the production of multilayer ceramic electronic components using the gravure printing machine as described above, the characteristics of the obtained multilayer ceramic electronic components can be stabilized and defective products can be obtained. Generation can be suppressed, and the production yield can be improved.

  In particular, if the conductive paste film is formed as an internal electrode provided in the multilayer ceramic electronic component by the gravure printing machine according to the present invention, the thickness of the conductive paste film can be made uniform. In the laminated ceramic electronic component, it is possible to prevent a short circuit failure or an insulation resistance failure.

  FIG. 1 is a front view schematically showing a gravure printing machine 1 according to a first embodiment of the present invention.

  The gravure printing machine 1 includes a gravure roll 2 and an impression cylinder 4 opposed to the gravure roll 2 with a printing sheet 3 interposed therebetween. The gravure roll 2 and the impression cylinder 4 rotate in the directions of arrows 5 and 6, respectively, so that the printing sheet 3 is conveyed in the direction of arrow 7.

  The gravure printer 1 is used for manufacturing a multilayer ceramic electronic component such as a multilayer ceramic capacitor. More specifically, the gravure printing machine 1 is used to form a paste film to be a patterned layer that forms a part of a multilayer structure provided in a multilayer ceramic electronic component on the printing sheet 3 by gravure printing. It is done. More specifically, as shown in FIG. 2, a conductive paste film 9 to be a patterned internal electrode is formed on the ceramic green sheet 8 by gravure printing.

  The ceramic green sheet 8 is backed by a carrier film 10 as shown in FIG. Therefore, the printing sheet 3 shown in FIG. 1 is the ceramic green sheet 8 backed by the carrier film 10 in this way.

  As shown in FIG. 1, the gravure roll 2 is immersed in a conductive paste 12 accommodated in a tank 11, whereby a plurality of image line portions 13 (formed on the peripheral surface of the gravure roll 2 ( A part of the conductive paste 12 is schematically shown). Details of the image line unit 13 will be described later. Excess conductive paste 12 on the peripheral surface of the gravure roll 2 is scraped off by a doctor blade 14.

  The image line portion 13 has a pattern corresponding to the pattern of the conductive paste film 9 shown in FIG. 2, as only a representative one is schematically shown in FIG. In this embodiment, the longitudinal direction of the image line portion 13 is directed to the circumferential direction of the gravure roll 2.

  FIG. 4 is a development view of the peripheral surface of the gravure roll 2, showing one image portion 13 in an enlarged manner. In FIG. 4, the printing direction is indicated by an arrow, and this printing direction corresponds to the arrow 5 shown in FIG. More specifically, the right end side in FIG. 4 of the image line unit 13 is the printing start end side, and the left end side is the printing end side. Accordingly, in the printing process, the region of the image line portion 13 that contacts the printing sheet 3 changes its position from the right end side to the left end side in FIG.

  The image line unit 13 is provided with a plurality of printing direction banks 15 extending in the printing direction and a plurality of vertical direction banks 16 extending in a direction perpendicular to the printing direction bank 15. Then, a plurality of cells 17 partitioned by the printing bank 15 and the vertical bank 16 are formed.

  Looking at the opening area of each of the plurality of cells 17, the cell 17 (A) located at the peripheral edge of the image line portion 13 is changed to the cell 17 (B) located at the center of the image line portion 13. It is smaller than that. In order to reduce the opening area of the cell 17 (A) located at the peripheral edge, each of the printing bank 15 and the vertical bank 16 is positioned at the peripheral edge of the image line portion 13 as compared with other parts. The width has been made larger. By adopting such a configuration, the “saddle phenomenon” described above can be made difficult to occur.

  Further, a plurality of vertical notches 18 are provided in the vertical bank 16 in order to make the cells 17 communicate with each other. As a result, in this embodiment, the vertical bank 16 is extended intermittently with the vertical notch 18 interposed.

  Further, each printing direction bank 15 is arranged so as to cross the vertical notch 18, and continuously extends in the image line portion 13. As for each vertical bank 16, the one located in contact with the printing direction bank 15 and the one located through the vertical notch 18 with respect to the printing direction bank 15 are alternately arranged with respect to the printing direction. As a result, the vertical cutout 18 is located in each of the two corner portions of each cell 17 that face each other in the diagonal direction.

  By adopting the above-described configuration, not only can the conductive paste 12 (see FIG. 1) flow smoothly between the adjacent cells 17, but also the conductive paste 12 can flow uniformly in the printing direction. The so-called stringing of the conductive paste 12 when the printing sheet 3 leaves the gravure roll 2 does not occur obliquely with respect to the peripheral surface of the gravure roll 2 and the printed conductive paste film 9 (see FIG. 2). ) In the peripheral shape, local unevenness can be made difficult to occur.

  As a comparative example, on the contrary, when the printing direction bank 15 is extended intermittently and the vertical direction bank 16 is extended continuously, relatively large unevenness occurs in the thickness of the conductive paste film 9. Has been confirmed.

  FIG. 5 is an enlarged view of the central region of the image line portion 13 shown in FIG. As shown in FIG. 5, in the central portion of the image line portion 13, the gap G between the vertical cutouts 18 is larger than the widths W of the printing bank 15 and the vertical bank 16. For example, while the width W is 5 to 20 μm, the interval G is 20 to 40 μm.

  By adopting such a configuration, even if the conductive paste 12 has a higher viscosity than a general gravure ink having a viscosity of, for example, 0.1 to 40 Pa · s, a constant flow in the printing direction is smooth. Therefore, a uniform thickness can be reliably obtained in the conductive paste film 9. In the illustrated embodiment, the widths W of the printing bank 15 and the vertical bank 16 are the same, but they may be different from each other.

  Referring to FIG. 4 again, at the printing start end side of the image line portion 13, there are at least one start end groove extending in a direction perpendicular to the printing direction, in this embodiment, two start end grooves 19 and 20. It is provided independently of the cell 17. These start-end grooves 19 and 20 are formed with a certain width and depth, respectively. Due to the presence of such start end grooves 19 and 20, it is possible to make it difficult for the conductive paste film 9 on the print start end side to be blurred or insufficient in thickness.

  In addition, the image line portion 13 is provided with a contour groove 21 having a constant width that defines at least a part of the contour. Note that the width of the contour groove 21 may be different between the printing direction and the vertical direction. Further, in this embodiment, the contour groove 21 has a certain depth, and is provided along three sides excluding the side on the printing start end side of the image portion 13. By adopting such a configuration, the linearity in the contour of the conductive paste film 9 can be improved.

  Further, the vertical cutout 18 is not formed on each outer side of the outermost one 15 (A) located on the outermost side of the printing direction bank 15. Such a configuration can contribute to the improvement of the linearity at the edge of the conductive paste film 9 described above, particularly the linearity at the edge extending in the printing direction.

  As described above, the opening area of each cell 17 is smaller in the cell 17 (A) located in the peripheral portion than the cell 17 (B) located in the central portion. Regardless of the size of the opening area, the cell 17 has the same depth. Therefore, the thickness of the conductive paste film 9 is governed by the opening area of the cell 17, so that the thickness of the conductive paste film 9 can be easily controlled.

  FIG. 6 is a front view showing a part of each of the gravure roll 2 and the impression cylinder 4. FIG. 6 schematically shows a part of the image line unit 13.

  The gravure roll 2 and the impression cylinder 4 are rotated while applying pressure between each other with the printing sheet 3 (see FIG. 1) interposed therebetween, and convey the printing sheet 3. In general, since the impression cylinder 4 is formed of an elastic body, a predetermined nip width N is given by the gravure roll 2 and the impression cylinder 4. Therefore, the conductive paste 12 applied to the image line portion 13 of the gravure roll 2 is transferred to the printing sheet 3 within a range defined by the nip width N.

  In this embodiment, the dimension L of the image line portion 13 in the circumferential direction of the gravure roll 2 is made smaller than the nip width N. Accordingly, at the time of printing, since the printing sheet 3 is separated from the gravure roll 2 after the entire image line unit 13 contacts the printing sheet 3, the printing paste of the conductive paste 12 in the image line unit 13 is removed. The backward flow is eliminated, and the conductive paste 12 can be uniformly transferred to the printing sheet 3. As a result, it is possible to advantageously prevent the conductive paste film 9 from fading due to an insufficient transfer amount of the conductive paste 12.

  In particular, as in this embodiment, when the printing direction bank 15 extends continuously in the image line portion 13, the conductive paste 12 flows in the printing direction only in a range surrounded by the printing direction bank 15. The effect of suppressing the occurrence of unevenness on the surface of the conductive paste film 9 is great.

  If the conductive paste film 9 is formed by the gravure printing machine 1 having the above-described configuration, the conductive paste film 9 is smooth over the entire surface and excellent in the linearity of the outer peripheral contour. be able to.

  After obtaining the ceramic green sheet 8 on which the conductive paste 9 as shown in FIG. 2 is formed using the gravure printing machine 1, a plurality of ceramic green sheets 8 are laminated and pressure-bonded, and cut as necessary. Then, by firing, a laminated structure serving as a component body for the multilayer ceramic electronic component is obtained. In this laminated structure, the conductive paste film 9 described above constitutes an internal electrode. Next, if necessary, external electrodes and the like are formed on the outer surface of the multilayer structure, thereby completing a desired multilayer ceramic electronic component.

  In such a multilayer ceramic electronic component, as described above, since the conductive paste film 9 is formed smoothly over the entire surface, stress is not concentrated locally in the crimping process. It is possible to prevent a short-circuit failure such as contact through the electrode, or a local decrease in the thickness of the ceramic layer to cause an insulation resistance failure.

  7 and 8 are diagrams for explaining the second and third embodiments of the present invention, respectively, and correspond to a part of FIG. 7 and 8, elements corresponding to those shown in FIG. 4 are denoted by the same reference numerals, and redundant description is omitted.

  In each of the embodiments shown in FIGS. 7 and 8, the position of the vertical bank 16 with respect to the printing bank 15 is changed as compared with the case of the first embodiment. However, as in the case of the first embodiment, each printing direction bank 15 extends continuously in the image line unit 13, and each vertical direction bank 16 is positioned in contact with the printing direction bank 15. Those arranged via the vertical cutouts 18 with respect to the printing direction bank 15 are alternately arranged with respect to the printing direction, and each of the two corner portions facing each other in the diagonal direction of each cell 17 has a vertical cutting direction. It has the characteristic that the notch 18 is located.

  FIG. 9 is a view for explaining a fourth embodiment of the present invention and corresponds to FIG. In FIG. 9, elements corresponding to those shown in FIG. 5 are denoted by the same reference numerals, and redundant description is omitted.

  In the embodiment shown in FIG. 9, the position of the vertical bank 16 relative to the printing bank 15 is changed as compared with the first embodiment, as in the second and third embodiments. Yes. However, as in the case of the first to third embodiments, each printing direction bank 15 has a feature that it continuously extends in the image line portion 13.

  Further, the first to fourth embodiments described above are commonly characterized in that the vertical cutouts 18 adjacent to each other in the printing direction are different from each other in the vertical direction with respect to the printing direction. have.

  By adopting such a configuration, as shown in FIG. 1, when the conductive paste 12 on the peripheral surface of the gravure roll 2 is scraped off by the doctor blade 14, each cell is undesirably formed. The conductive paste 12 that should remain in the portion 17 is scraped off, so that it is possible to advantageously prevent the conductive paste film 9 shown in FIG. 2 from being partially thinned.

  Further, the stringing of the conductive paste 12 when the ceramic green sheet 8 leaves the gravure roll 2 proceeds continuously via the vertical cutout 18. Therefore, if the positions of the vertical notches 18 adjacent to each other are shifted in the direction perpendicular to the printing direction as described above, the conductive paste film 9 that can be generated by stringing the conductive paste 12 is formed. Unevenness on the surface can be suppressed.

  Note that the above-described characteristics related to the position of the vertical notch 18 are also employed in the fifth embodiment described below.

  FIGS. 10 and 11 are diagrams for explaining a fifth embodiment of the present invention and correspond to FIGS. 4 and 5, respectively. 10 and 11, elements corresponding to those shown in FIGS. 4 and 5 are denoted by the same reference numerals, and redundant description is omitted.

  In the embodiment shown in FIG. 10, the printing direction bank 15 is provided with a plurality of printing direction notches 22 so that each printing direction bank 15 extends intermittently with the printing direction notches 22 interposed therebetween. It is characterized by being made. Further, a printing direction bank 15 is arranged so as to cross the vertical direction notch 18, and a vertical direction bank 16 is arranged so as to cross the printing direction notch 22. The vertical cutout 18 or the print cutout 22 is positioned at each corner of each cell 17.

  The embodiment shown in FIG. 10 has the following features in common with the embodiment shown in FIG.

  First, the cell 17 (A) located at the periphery of the image line portion 13 is made smaller than the cell 17 (B) located at the center of the image line portion 13. As a result, the “saddle phenomenon” can be made difficult to occur.

  Further, in the central portion of the image line portion 13, as well shown in FIG. 11, the interval G 1 of the vertical notch 18 is made larger than the widths W of the printing direction bank 15 and the vertical direction bank 16. Yes. Furthermore, in this embodiment, the gap G2 between the printing direction cutouts 22 is also made larger than each width W of the printing direction bank 15 and the vertical direction bank 16. As a result, even if the conductive paste 12 has a relatively high viscosity, it is easy to cause a flow between the adjacent cells 17, and a uniform thickness can be obtained in the conductive paste film 9.

  In addition, the image line portion 13 is provided with a contour groove 21 having a constant width that defines at least a part of the contour. Note that the width of the contour groove 21 may be different between the printing direction and the vertical direction. In this embodiment, the contour groove 21 is provided over the entire circumference of the image portion 13. Due to the presence of the contour groove 21, the linearity at the edge of the conductive paste film 9 can be improved.

  The plurality of cells 17 have the same depth. Thus, the thickness of the conductive paste film 9 can be easily controlled by the opening area of each cell 17.

  Also in this embodiment, preferably, the configuration as described with reference to FIG. 6, that is, the dimension L of the image portion 13 in the circumferential direction of the gravure roll 2 is set to the gravure roll 2 and the impression cylinder 4. A configuration in which the nip width N is smaller than that given by the above is adopted.

  Further, the vertical cutouts 18 adjacent to each other in the printing direction are different from each other in the vertical direction with respect to the printing direction.

  Furthermore, in the embodiment shown in FIG. 10, the opening area of the cell 17 (C) located on the printing start end side and the cell 17 (D) located on the printing end side of the image line portion 13 is the same. The This can contribute to improvement in the uniformity of the thickness of the conductive paste film 9.

  While the present invention has been described with reference to the illustrated embodiment, various other modifications are possible within the scope of the present invention.

  For example, in the illustrated embodiment, the image portion 13 is rectangular, but the shape of the image portion is arbitrarily changed according to the pattern of the conductive paste film 9 to be formed by gravure printing. can do.

  In the illustrated embodiment, the printing sheet 3 is a ceramic green sheet 8 backed by a carrier film 10, and the conductive paste film 9 is formed on the ceramic green sheet 8. Only such a resin sheet may be used as the printing sheet 3, and the conductive paste film 9 may be formed on the resin sheet. In this case, the conductive paste film 9 formed on the resin sheet is transferred onto the ceramic green sheet 8 in a subsequent process.

  In the illustrated embodiment, the paste film formed by gravure printing is the conductive paste film 9, but may be a film made of a paste like ceramic slurry, for example. More specifically, for example, in a multilayer ceramic capacitor or the like, in order to absorb a step due to the thickness of the internal electrode, a step absorbing ceramic layer may be formed in a region where the internal electrode is not formed. The present invention can also be applied to a case where a paste film made of a ceramic slurry to be a layer is to be formed.

1 is a front view schematically showing a gravure printing machine 1 according to a first embodiment of the present invention. It is sectional drawing which shows the state by which the conductive paste film | membrane 9 was formed on the ceramic green sheet 8 backed by the carrier film 10 as the to-be-printed sheet 3 with the gravure printing machine 1 shown in FIG. It is a perspective view which shows independently the gravure roll 2 shown in FIG. FIG. 4 is a development view of the peripheral surface of the gravure roll 2, showing an enlargement of one image line portion 13 shown in FIG. 3. It is a figure which expands and shows a part of image drawing part 13 shown in FIG. It is a front view which expands and shows each part of the gravure roll 2 and the impression cylinder 4 shown in FIG. It is a figure equivalent to a part of FIG. 4 which shows the image line part 13 by 2nd Embodiment of this invention. It is a figure equivalent to a part of FIG. 4 which shows the image line part 13 by 3rd Embodiment of this invention. It is a figure equivalent to FIG. 5 which shows the drawing part 13 by 4th Embodiment of this invention. It is a figure equivalent to FIG. 4 which shows the image line part 13 by 5th Embodiment of this invention. It is a figure which expands and shows a part of image drawing part 13 shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Gravure printing machine 2 Gravure roll 3 Printed sheet 4 Impression cylinder 8 Ceramic green sheet 9 Conductive paste film 12 Conductive paste 13 Image line 15 Printing direction bank 15 (A) Outermost printing direction bank 16 Vertical direction Bank 17 Cell 17 (A) Cell located at the peripheral edge 17 (B) Cell located at the center 17 (C) Cell located at the print start end 17 (D) Cell located at the print end 18 Vertical notch 19, 20 Start end groove 21 Contour groove 22 Printing direction notch G, G1 Vertical notch spacing W Bank width N Nip width L Size of image area

Claims (15)

A gravure printing machine for forming a paste film to be a patterned internal electrode or ceramic layer that forms a part of a multilayer structure provided in a multilayer ceramic electronic component on a printed sheet by gravure printing,
A gravure roll forming on the peripheral surface thereof an image line portion to which a printing paste made of a conductive paste or ceramic slurry giving the paste film is applied;
An impression cylinder facing the gravure roll across the printing sheet,
The image line portion is provided with a printing direction bank extending substantially in the printing direction and a vertical bank extending substantially perpendicular to the printing direction bank, and is partitioned by the printing direction bank and the vertical bank. A plurality of cells are formed,
In order to bring the cells into communication between adjacent ones, the vertical bank is provided with a vertical cutout, and the printing bank is arranged to cross the vertical cutout, In the central part of the portion, the interval between the vertical cutouts is larger than the widths of the printing direction bank and the vertical direction bank,
Gravure printing machine.   The gravure printing machine according to claim 1, wherein the printing direction bank is provided so as to continuously extend from a vicinity of a printing start end to a vicinity of a printing end in the image line portion.   The gravure printing machine according to claim 1, wherein the vertical cutouts adjacent to each other in the printing direction are different from each other in a position perpendicular to the printing direction.   The opening area of each of the plurality of cells is smaller than the cell located at the peripheral portion of the image line portion, compared to the cell located at the center of the image line portion. A gravure printing machine according to any one of the above.   Each of the printing direction banks extends continuously in the image line portion, and each of the vertical direction banks is located in contact with the printing direction bank and the vertical notch with respect to the printing direction bank. The vertical notches are located at two corner portions opposite to each other in a diagonal direction of each of the cells. Gravure printing machine.   The gravure printing machine according to claim 5, wherein at least one start end groove extending in a direction perpendicular to a print direction is provided on the print start end side of the image line portion independently of the cell.   The gravure printing machine according to claim 5 or 6, wherein the vertical cutout is not formed on each outer side of the outermost one in the printing direction bank.   The printing direction bank is provided with a plurality of printing direction cutouts, whereby each of the printing direction banks is extended intermittently through the printing direction cutouts, and the printing direction cutouts are formed. The gravure printing press according to claim 1, wherein the vertical bank is disposed so as to cross, and the vertical notch or the printing direction notch is located at each corner portion of each cell.   The gravure printing machine according to claim 8, wherein the opening areas of the cells located on the printing start end side and the printing end side of the image line portion are the same.   The gravure printing machine according to any one of claims 1 to 9, wherein the image line portion is provided with a groove having a constant width that defines at least a part of an outline thereof.   The gravure printing machine according to claim 1, wherein the plurality of cells have the same depth.   The gravure printing machine according to any one of claims 1 to 11, wherein a size of the image line portion in a circumferential direction of the gravure roll is smaller than a nip width provided by the gravure roll and the impression cylinder.   A method for manufacturing a multilayer ceramic electronic component, wherein a step of forming a paste film to be an internal electrode or ceramic layer patterned using the gravure printing machine according to any one of claims 1 to 12 is performed.   The method for manufacturing a multilayer ceramic electronic component according to claim 13, wherein the printed sheet is a ceramic green sheet. A gravure roll provided in a gravure printing machine for forming a patterned internal electrode forming a part of a laminated structure provided in a multilayer ceramic electronic component or a paste film to be a ceramic layer on a printed sheet by gravure printing. And
An image line portion to which a printing paste made of a conductive paste or ceramic slurry giving the paste film is applied is formed on the peripheral surface thereof,
The image line portion is provided with a printing direction bank extending substantially in the printing direction and a vertical bank extending substantially perpendicular to the printing direction bank, and is partitioned by the printing direction bank and the vertical bank. A plurality of cells are formed,
In order to bring the cells into communication between adjacent ones, the vertical bank is provided with a vertical cutout, and the printing bank is arranged to cross the vertical cutout, In the central part of the portion, the interval between the vertical cutouts is larger than the widths of the printing direction bank and the vertical direction bank,
Gravure roll.

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