JP4639670B2 - Paste supply device and method of manufacturing electronic component using paste supply device - Google Patents

Description

  The present invention relates to a paste supply apparatus used for gravure printing, and more particularly to a paste supply apparatus having a doctor chamber having a paste storage section and a doctor blade, and a method of manufacturing an electronic component using the paste supply apparatus.

  In the gravure printing method, a paste supply apparatus having a doctor chamber is widely used.

  In a paste supply apparatus having a doctor chamber, the plate cylinder is immersed in the paste in the paste storage part of the doctor chamber, and the plate cylinder itself rotates to pump up the paste. After pumping up the paste, excess paste adhering to the plate cylinder is scraped off by the doctor blade. After the excess paste is scraped off, the paste in the recesses on the outer peripheral surface of the plate cylinder is transferred to a printing substrate such as paper supplied between the plate cylinder and the impression cylinder, and printing is performed. .

  The following Patent Document 1 discloses an ink supply device 101 for gravure printing shown in a side sectional view in FIG. The ink supply device 101 includes a plate cylinder 102 and an ink fountain 103. Most of the plate cylinder 102 is located in the ink fountain 103.

  The ink fountain 103 has an arc shape and has two wall surfaces 104a and 104b connected to each other. That is, the space between the wall surfaces 104 a and 104 b and the outer peripheral surface of the plate cylinder 102 constitutes the ink fountain 103. The ink fountain 103 is connected to an external ink introduction tube 105a and an ink discharge tube 105b. The ink supply device 101 includes a doctor blade 106 that scrapes off excess paste and a seal blade 107 that prevents the paste from returning to the ink fountain 103.

  In the ink supply apparatus 101 described in Patent Document 1, since most of the plate cylinder 102 is covered with the ink fountain 103, ink is easily filled in the recesses on the outer peripheral surface of the plate cylinder. In addition, the time during which the ink in the recesses on the outer peripheral surface of the plate cylinder contacts the air is shortened. Further, in the ink supply apparatus 101, since most of the plate cylinder 102 is covered with the ink fountain 103, even when the plate cylinder 102 is rotated at a high speed, ink scattering hardly occurs.

Further, in the ink supply apparatus 101, evaporation of the ink solvent is suppressed by blocking the ink circulation path from outside air. Therefore, since no solid matter of ink remains in the ink fountain 103, it is considered that plate clogging is unlikely to occur during printing.
JP-A-10-157075

  However, in the ink supply device 101 described in Patent Document 1, the portions of the wall surfaces 104 a and 104 b facing the plate cylinder 102 have an arc shape that is substantially concentric with the outer peripheral surface of the plate cylinder 102. Therefore, a large amount of expensive ink has to be introduced into the ink fountain 103.

  By the way, in order to reduce the amount of ink staying in the ink fountain 103, the distance between the outer peripheral surface of the plate cylinder 102 and the wall surfaces 104a and 104b may be reduced. However, when this interval is narrowed, when the plate cylinder 102 rotates at a high speed, the ink pumped up by the plate cylinder and the ink scraped off by the doctor blade 105 lose their place and overflow from the ink fountain 103. It was apt.

  In view of the current state of the prior art described above, the present invention can reduce the amount of paste that stays in use and reliably prevents the remaining paste from overflowing to the outside even when the plate cylinder is rotated at a high speed. An object of the present invention is to provide a paste supply device that can be used and a method of manufacturing an electronic component using the paste supply device.

A paste supply apparatus according to the present invention is a paste supply apparatus for supplying a paste for printing an internal electrode pattern on a ceramic green sheet to a plate cylinder used in gravure printing, and is opposed to the outer surface of the plate cylinder. A doctor chamber having a paste reservoir in which paste is stored on the inner surface, and a doctor blade in contact with the outer surface of the plate cylinder to scrape off excess paste adhering to the plate cylinder An interval is provided between the outer surface of the plate cylinder and the inner surface of the doctor chamber, and this interval is the narrowest in the vicinity of the lowest point of the plate cylinder. according, are continuously and / or stepwise large, the doctor chamber in which the plate cylinder is positioned on the downstream side of the liquid flow of the paste produced when a rotating The interval in part, characterized in that it is wider than the spacing at the ends of the doctor chamber positioned upstream of the paste.

In a specific aspect of the paste supply apparatus according to the present invention, the interval at the end of the doctor chamber located on the downstream side of the paste liquid flow generated when the plate cylinder rotates is 20 to 40 mm, The said space | interval in the edge part of the said doctor chamber located in the upstream of the said paste exists in the range of 5-10 mm.

  In another specific aspect of the paste supply apparatus according to the present invention, the doctor blade is detachably attached by a holding member different from the doctor chamber.

  In another specific aspect of the paste supply apparatus according to the present invention, in order to prevent the paste attached to the plate cylinder from returning to the paste reservoir, the paste supply apparatus is in contact with the outer surface of the plate cylinder. The center angle of the plate cylinder on the paste reservoir side from the contact point between the plate cylinder and the doctor blade to the contact point between the plate cylinder and the seal blade is in the range of 220 ° to 315 °, and the paste reservoir The space having the portion is blocked from the external space.

  In still another specific aspect of the paste supply apparatus according to the present invention, the doctor chamber retains the paste in the paste reservoir, and the plate cylinder is immersed in the retained paste to paste the outer surface of the plate cylinder. Is a non-circulating doctor chamber.

  In still another specific aspect of the paste supply device according to the present invention, the paste supply device further includes a swing device connected to the doctor chamber so as to swing the doctor chamber with respect to the axial direction of the plate cylinder. To do.

  In still another specific aspect of the paste supply device according to the present invention, the swing device is connected to the doctor chamber and the doctor blade so as to swing the doctor chamber and the doctor blade in synchronization. Features.

  A gravure printing apparatus according to the present invention includes a paste supply device configured in accordance with the present invention, a plate cylinder, and a pressure cylinder that presses the printed material from the back side of the printed material pressed against the plate cylinder.

  A method for manufacturing a multilayer ceramic electronic component according to the present invention is characterized in that an internal electrode pattern is printed on a long ceramic green sheet using a paste supply device configured according to the present invention.

  In the paste supply apparatus according to the present invention, an interval is provided between the outer surface of the plate cylinder and the inner surface of the doctor chamber, and this interval is the narrowest in the vicinity of the lowest point of the plate cylinder, Since it is widened in a continuous and / or stepwise manner from the vicinity of the lowest point toward the top, it is possible to reduce the amount of paste retained in the paste reservoir during use, and to prevent the paste from overflowing to the outside. it can.

In the paste supply apparatus according to the present invention, the interval at the end of the doctor chamber located on the downstream side of the paste liquid flow generated when the plate cylinder rotates is the interval at the end of the doctor chamber located on the upstream side of the paste Therefore , even if the plate cylinder is rotated at a high speed, the staying paste hardly overflows to the outside.

Further, since the interval is narrower at the ends of the doctor chamber located upstream, air amount in the space having a paste reservoir is reduced. Therefore, volatilization of the solvent of the paste is suppressed and the paste can be prevented from drying out.

  In the present invention, when the doctor blade is detachably attached by a holding member different from the doctor chamber, only the doctor blade can be removed for easy cleaning. In addition, the replacement of the doctor blade is facilitated, so that productivity is increased.

  In the present invention, the central angle of the plate cylinder on the paste reservoir side from the contact point between the plate cylinder and the doctor blade to the contact point between the plate cylinder and the seal blade is in the range of 220 ° to 315 °, and the paste reservoir portion is When the space that is included is blocked from the external space, it is possible to effectively prevent the paste from overflowing during use. Furthermore, the volatilization of the solvent of the paste is also effectively suppressed, and the paste becomes difficult to dry.

  Since the doctor chamber in the present invention is a non-circulating doctor chamber, a minimum amount of paste necessary for printing may be introduced into the paste reservoir. Therefore, the amount of paste used can be reduced.

  In the present invention, when the doctor chamber is further provided with a swinging device connected to the doctor chamber so as to swing the doctor chamber with respect to the axial direction of the plate cylinder, the paste is applied with respect to the axial direction of the plate cylinder. Due to the convection, printing can be performed while the staying paste is uniformly used, and there is no paste staying at both ends of the chamber.

  In the present invention, when the oscillating device is connected to the doctor chamber and the doctor blade so as to oscillate the doctor chamber and the doctor blade synchronously, the sealing property of the space having the paste reservoir is ensured. Can be increased.

  In the case of printing with a gravure printing apparatus including a paste supply device, a plate cylinder, and an impression cylinder according to the present invention, it is possible to perform printing more reliably by pressing a printing material against the plate cylinder from the impression cylinder. .

  In the method for manufacturing a multilayer ceramic electronic component according to the present invention, an internal electrode pattern is printed on a long ceramic green sheet using a paste supply apparatus configured according to the present invention. Therefore, it is possible to obtain a multilayer ceramic electronic component that is less likely to cause disconnection / short circuit. Furthermore, the amount of expensive paste used can be reduced.

  Hereinafter, the present invention will be clarified by describing specific embodiments of the present invention with reference to the drawings.

  1A and 1B are a perspective view and a side sectional view showing a main part of a gravure printing apparatus 1 having a paste supply apparatus 2 according to an embodiment of the present invention.

  The gravure printing apparatus 1 includes a paste supply device 2 having a doctor chamber 3. The paste supply device 2 is arranged to supply the paste 7 to the plate cylinder 6.

  The inner surface 8 of the doctor chamber 3 is a semi-cylindrical curved surface, and thus the cross section has an arc shape. The paste 7 is stored on the inner surface 8 of the doctor chamber 3 to form a paste storage portion 8a.

  As shown in FIG. 1A, the plate cylinder 6 has a cylindrical shape. On the outer peripheral surface 9 of the plate cylinder 6, a print image line portion 6 d is formed by leaving a portion having a predetermined width from the first and second side surfaces 6 a and 6 b. A plurality of concave portions 6c are formed in the print image line portion 6d. Each recess 6 c is filled with paste 7.

  In the following description, the direction connecting the first side surface 6a and the second side surface 6b of the plate cylinder 6 is the width direction. The dimension L1 in the width direction of the doctor chamber 3 along the width direction of the plate cylinder 6 is longer than the dimension L2 in the width direction of the print image line portion 6d of the plate cylinder 6 and is larger than the dimension L3 in the width direction of the plate cylinder 6. It has been shortened. In order to reduce the amount of the paste 7 that stays, the dimension L1 in the width direction of the doctor chamber 3 is slightly longer than the dimension L2 in the width direction of the printed image portion 6d. Although the dimension L1 of the width direction of the doctor chamber 3 can be set according to the dimension of a to-be-printed material, it is 250-350 mm in this embodiment.

  The plate cylinder 6 is arranged so that the lower part is immersed in the paste 7 staying in the paste reservoir 8 a of the doctor chamber 3. The outer peripheral surface 9 of the plate cylinder 6 is disposed so as to face the inner surface 8 of the doctor chamber 3. An interval E is provided between the outer peripheral surface 9 of the plate cylinder 6 and the inner surface 8 of the doctor chamber 3. In order to reduce the amount of the paste 7 staying in the paste reservoir 8a, the interval E is narrowest in the vicinity of the lowest point 6e of the plate cylinder 6. Although the space | interval E in the lowest point vicinity 6e is not specifically limited, In this embodiment, it is set to 1-5 mm. In order to prevent the paste 7 from overflowing to the outside during use, the interval E is continuously increased from the vicinity of the lowest point 6e of the plate cylinder 6 toward the upper part.

  In the present invention, the shape of the inner surface 8 of the doctor chamber 3 is not particularly limited as long as it can prevent the paste 7 from overflowing to the outside during use. 2A, the cross-sectional shape of the inner surface 8 of the doctor chamber 3 is concentric with the outer peripheral surface 9 of the plate cylinder 6 in the vicinity of the lowest point 6e of the plate cylinder 6, as shown in a schematic side sectional view. In the vicinity of the end portions 3a and 3b of the doctor chamber 3, a straight line may be used. That is, you may employ | adopt the cross-sectional shape which combined the said concentric circle and the straight line. Furthermore, as shown in a schematic side cross-sectional view in FIG. 2B, the cross-sectional shape of the inner surface 8 of the doctor chamber 3 may be a stepped shape. That is, the interval E only needs to be increased continuously and / or stepwise from the bottom point vicinity 6e of the plate cylinder 6 toward the upper part.

  The doctor chamber 3 is preferably an integral structure rather than a structure in which a plurality of members are connected.

  In the present invention, the viscosity of the paste 7 used for gravure printing is not particularly limited, but is preferably about 1 to 100 Pa · s at 20 ° C. When the plate cylinder 6 rotates and a liquid flow is generated in the paste 7, the paste 7 is pushed toward the downstream side in the paste reservoir 8. When the viscosity of the paste 7 used for printing is high, the paste 7 tends to overflow to the outside on the downstream side. Therefore, in order to reliably prevent the paste 7 from overflowing to the outside, the interval E at the end portion 3a of the doctor chamber 3 located on the downstream side of the paste 7 is equal to the end of the doctor chamber 3 located on the upstream side of the paste 7. It is made wider than the space | interval E in the part 3b. The interval E at the end portions 3a and 3b of the doctor chamber 3 is not particularly limited, but the interval E at the end portion 3a of the doctor chamber 3 located on the downstream side is preferably 20 to 40 mm, and the doctor chamber located on the upstream side 3 is more preferably 5 to 10 mm.

  The doctor chamber 3 retains the paste 7 in the paste reservoir 8 a, immerses the plate cylinder 6 in the retained paste 7, and supplies the paste 7 to the outer peripheral surface 6 a of the plate cylinder 6. It is a chamber. On the other hand, the conventionally known circulation type doctor chamber is a structure that is pressed from the side of the plate cylinder, discharges the old paste while supplying new paste, and circulates the paste in the doctor chamber. Say. In the circulation type doctor chamber, there is a disadvantage that paste consumption is increased.

  On the other hand, the doctor chamber 3 used in the present embodiment does not discharge the paste from the doctor chamber 3 as described above. In other words, the paste is not circulated in the doctor chamber 3, and thus the consumption amount of the paste 7 Can be reduced.

  As shown in FIGS. 1A and 1B, a paste supply device 2 according to the present invention has a doctor blade 4 in the vicinity of an end 3 a of a doctor chamber 3. The doctor blade 4 has a rectangular plate shape. In order to scrape off the excess paste 7 attached to the plate cylinder 6 in use, the tip of the doctor blade 4 is brought into contact with the outer peripheral surface 9 of the plate cylinder 6 in the vicinity of the end 3a of the doctor chamber 3. A doctor blade 4 is attached. The dimension L4 in the width direction of the doctor blade 4 is made longer than the dimension L1 in the width direction of the doctor chamber 3 in order to scrape off excess paste 7 adhering to the outer peripheral surface 9 of the plate cylinder 6.

  In the present embodiment, in order to prevent the paste 7 from leaking to the outside, the doctor blade 4 is attached so as to be pressed toward the center of the plate cylinder 6. The doctor blade 4 may be attached so as to be pressed toward the center of the plate cylinder 6 from the surface opposite to the side where the doctor blade 4 contacts the plate cylinder 6.

  The contact angle θx between the doctor blade 4 and the plate cylinder 6 is not particularly limited, but is preferably in the range of 40 to 75 °. In the present invention, the contact angle θx between the doctor blade 4 and the plate cylinder 6 refers to a tangent line x to a circle having a cross-sectional shape of the plate cylinder 6 passing through a portion where the doctor blade 4 contacts the plate cylinder 6, This is the angle between the four blade surfaces.

  Examples of the material of the doctor blade 4 include, but are not limited to, plastic, resin, ceramic, metal, and the like. In this embodiment, since the material of the plate cylinder 6 is hard chrome with high hardness, the material of the doctor blade 4 is metal.

  When the viscosity of the paste 7 is high or when the plate cylinder 6 is rotated at a high speed, the paste 7 is more effectively prevented from overflowing from between the doctor chamber 3 and the doctor blade 4 as shown in FIG. As shown in b), a paste turn 4A may be attached to the doctor blade 4. The paste return 4A is a plate that guides the paste liquid flow generated in the direction of the doctor blade from the paste reservoir by rotating the plate cylinder from the doctor blade to the paste reservoir 8a in the doctor chamber.

  As shown in FIG. 1 (b), the seal blade 5 is disposed near the end 3b of the doctor chamber 3 in order to prevent dust adhering to the outer peripheral surface 9 of the plate cylinder 6 from entering the paste reservoir 8a. It is attached to the doctor chamber 3. The seal blade 5 may be directly attached to the doctor chamber 3 using a cylinder or a screw, or may be attached via another member. Although not particularly limited, in the present embodiment, the seal blade 5 has a rectangular plate shape. During printing, the paste 7 adhering to the doctor blade 4 may adhere to the outer peripheral surface 9 of the plate cylinder 6 again from the first and second side surfaces 4 a and 4 b of the doctor blade 4 due to the rotation of the plate cylinder 6. The dimension L5 in the width direction of the seal blade 5 is preferably longer than the dimension L4 in the width direction of the doctor blade 4 so that the paste 7 that has adhered again can be removed.

  The contact angle θy between the seal blade 5 and the plate cylinder 6 is not particularly limited, but is preferably in the range of 0 to 30 °, whereby the entrainment of the seal blade 5 due to the rotation of the plate cylinder 6 can be suppressed. In the present invention, the contact angle θy between the seal blade 5 and the plate cylinder 6 is the tangent line y to the circle which is the cross-sectional shape of the plate cylinder 6 passing through the portion where the seal blade 5 contacts the plate cylinder 6 and the seal blade 5. This is the angle between the blade surface.

  Examples of the material of the seal blade 5 include, but are not limited to, plastic, resin, ceramic, metal, and the like. In this embodiment, since the material of the plate cylinder 6 is hard chrome with high hardness, the material of the seal blade 5 is metal.

  FIG. 1C is a side view showing the main part of the gravure printing apparatus 1 having the paste supply apparatus 2.

  The first and second side surfaces 3 c and 3 d of the doctor chamber 3 are covered with a side seal 10. Airtightness is maintained at the portion where the outer peripheral surface 9 of the plate cylinder 6, the doctor blade 4, the seal blade 5 and the side seal 10 abut. Further, in the gravure printing apparatus 1, in order to make the space having the paste reservoir portion 8 a a sealed space that is cut off from the external space, a sealing film 11 is formed so as to close a gap between the doctor chamber 3 and the doctor blade 4. Is installed.

  In the present embodiment, the side seal 10 is composed of one seal material. The side seal 10 covers the side surface of the doctor chamber 3 and is in contact with the outer peripheral surface 9 of the plate cylinder 6, the doctor blade 4, the sealing film 11, and the seal blade 5. The side seals 10 are attached so as to be pressed toward the rotation center axis direction of the plate cylinder 6. In order to effectively prevent the paste 7 from overflowing to the outside, the side seal 10 is pressed at the contact point between the side seal 10 and the outer peripheral surface 9 of the plate cylinder 6 until the side seal 10 is crushed by about 0 to 10 mm, and the gap is completely formed. It can be in a state of being buried in.

  The side seal may be divided into a plurality of sealing materials. That is, as in the modification shown in FIG. 4, the side seal 10 may be composed of three sealing materials 10A, 10B, and 10C. In FIG. 4, the sealing material 10 </ b> A covers the side surface of the doctor chamber 3 on the end 3 a side, and abuts against the outer peripheral surface 9 of the plate cylinder 6, the doctor blade 4, the sealing film 11 and the side seal 10 </ b> B. Has been. The sealing material 10B covers the lower side surface of the doctor chamber 3, and is in contact with the outer peripheral surface 9 of the plate cylinder 6 and the sealing materials 10A and 10C. The sealing material 10C covers the side surface of the doctor chamber 3 on the end 3b side, and is in contact with the outer peripheral surface 9 of the plate cylinder 6, the sealing blade 5, and the sealing material 10B.

  The sealing materials 10A, 10B, and 10C are attached so as to be pressed toward the central axis of rotation of the plate cylinder 6, respectively. In order to effectively prevent the paste 7 from overflowing to the outside, the side seal 10 is pressed at the contact point between the side seal 10 and the outer peripheral surface 9 of the plate cylinder 6 until the side seal 10 is crushed by about 0 to 10 mm. Should be filled completely.

  Returning to FIGS. 1A to 1C, as a material of the side seal 10, a soft material having followability with respect to the outer peripheral surface 9 of the plate cylinder 6, the doctor blade 4, and the seal blade 5 is used. Although the material of the side seal 10 is not particularly limited, an elastic body having a self-lubricating property is preferably used, but in the present embodiment, the material of the side seal 10 is a fluororesin.

  In addition, as shown in FIG.1 (c), the part which the side seal 10 contact | abuts with the outer peripheral surface 9 of the plate cylinder 6, the doctor blade 4, and the seal blade 5 is cut diagonally so that the front-end | tip 10d may become sharp. The followability may be improved with respect to the outer peripheral surface 9 of the plate cylinder 6, the doctor blade 4, and the seal blade 5.

  Further, when the side seal 10 is attached, a solvent contained in the paste 7 may be infused into the side seal 10. When the side seal 10 is soaked with the solvent contained in the paste 7, the volatilization of the solvent of the paste 7 staying in the paste reservoir 8a is suppressed, and the paste 7 is effectively prevented from drying out. Can do. Further, friction between the side seal and the plate cylinder can be reduced, and generation of shavings due to wear of the side seal can be suppressed.

  In the present embodiment, the central angle θ of the plate cylinder 6 on the paste reservoir 8a side from the contact point between the plate cylinder 6 and the doctor blade 4 to the contact point between the plate cylinder 6 and the seal blade 5 is preferably 220 ° to 315. It is in the range of °. When the central angle is in the range of 220 ° to 315 °, the contact with the air in the external space of the paste 7 is reduced during use, and the paste 7 can be prevented from being solidified.

  In the gravure printing apparatus 1, since the space having the paste reservoir 8 a is blocked from the external space, the paste 7 is difficult to overflow. Furthermore, the volatilization of the solvent of the paste 7 can also be effectively suppressed, and the paste 7 can be prevented from drying out.

  When printing is performed using the gravure printing apparatus 1 having the paste supply apparatus 2, if the printing amount is large, the paste 7 introduced into the paste reservoir 8a at the initial stage of printing may be insufficient. Therefore, in this embodiment, a paste supply port 12 for supplying the paste 7 is formed in the vicinity of the end 3 b of the doctor chamber 3. Further, a plurality of paste supply ports 12 are arranged in a distributed manner so that the paste 7 is distributed over the entire print image line portion 6d of the plate cylinder 6.

  A sensor 13 is attached to the inner surface 8 of the doctor chamber 3 in order to detect the amount of the paste 7 staying in the paste reservoir 8a. As the sensor 13 that can detect the amount of the paste 7, a proximity sensor, a laser sensor, or the like can be used. Preferably, the sensor 13 is covered with a synthetic resin such as polyethylene terephthalate or fluororesin.

  In the paste supply device 2, a discharge port 15 including a drain 15 a and a valve 15 b is formed in the lower portion of the doctor chamber 3 so that the paste 7 staying in the paste reservoir 8 a after printing can be discharged. However, in order to reduce the amount of paste 7 introduced into the paste reservoir 8a, it is preferable that the paste 7 staying in the paste reservoir 8a is not discharged during printing.

  When the paste supply device 2 is operated, the doctor chamber 3 may be provided with a swing device X schematically shown in FIG. When the swinging device is mounted, it is preferable that the doctor chamber 3 swings with respect to the axial direction of the plate cylinder 6 in order to convect the paste 7 in a cross section orthogonal to the axial direction of the plate cylinder 6. Further, in order to improve the sealing property of the space having the paste reservoir 8a, it is preferable to attach a swinging device so that the doctor chamber 3 and the doctor blade 4 swing in synchronization.

  In FIG. 3, the whole gravure printing apparatus 1 which has the said paste supply apparatus 2 is shown with a schematic block diagram.

  In the gravure printing apparatus 1, a long printed material 31 is sent out from an unwinding section 32a. The fed printing material 32a is conveyed through rollers 35a to 35e, and is between the plate cylinder 6 of the paste supply device 2 described above and the impression cylinder 33 disposed so as to be in contact with the outer peripheral surface 9 of the plate cylinder 6. To be supplied. In the paste supply device 2, the recess 6 c of the outer peripheral surface 9 of the plate cylinder 6 is filled with the paste 7 pumped up by the rotation of the plate cylinder 6. When the substrate 31 is supplied between the plate cylinder 6 and the impression cylinder 33, the paste 7 pumped into the recess 6c of the outer peripheral surface 9 of the plate cylinder 6 is transferred to the substrate 31 to form a printed image. The The substrate 31 to which the paste 7 is attached is sent to the drying furnace 34 via the roller 35f. In the drying furnace 34, rollers 35g to 35k are arranged. After the adhered paste 7 is dried, the printing material 31 on which the printed image is formed is wound up by the winding unit 32b via the rollers 35l and 35m.

  A specific method for printing an internal electrode pattern on a long ceramic green sheet using a gravure printing apparatus having the paste supply apparatus 2 will be described.

The internal electrode paste 7 having a volume of 300 to 1000 mm ³ may be supplied to the paste reservoir 8a of the paste supply device 2 before printing in order to prevent the paste 7 from drying. After supplying the paste 7 to the paste reservoir 8a, before the printing, the plate cylinder 6 may be rotated at a speed of 1 to 10 m / min, for example.

  At the time of printing, the plate cylinder 6 may be rotated at a speed of, for example, 10 to 200 m / min.

  During the work of switching to the next ceramic green sheet, the plate cylinder 6 may be rotated at a speed of 1 to 10 m / min, for example.

  FIG. 5 shows a main part of a gravure printing apparatus 41 having a paste supply apparatus 42 according to the second embodiment of the present invention.

  Note that the gravure printing apparatus 41 used in the second embodiment basically has the same structure as the gravure printing apparatus 1 described above. The only difference is the method of holding the doctor chamber 2 and the doctor blade 4 of the paste supply device 42. Therefore, in the following description of 2nd Embodiment, it abbreviate | omits by using the description of the gravure printing apparatus 1 which has the paste supply apparatus 2 mentioned above.

  In the paste supply device 42, the doctor chamber 3 is held by a holding member 43. On the other hand, the doctor blade 4 is held by another holding member 44 different from the holding member 43 of the doctor chamber 3. The doctor blade 4 is detachably attached by a holding member 44.

  In the second embodiment, the doctor blade 4 is easily removable. Therefore, even if the ceramic green sheet is printed for a long distance and the paste 7 accumulates on the doctor blade 4, the doctor blade 4 can be easily removed and cleaned. Therefore, internal electrode scratching can be prevented in advance, and in the obtained multilayer ceramic electronic component, the occurrence rate of disconnection and short-circuit due to internal electrode dragging is significantly reduced.

(A), (b) and (c) are the perspective view, side sectional drawing, and side view which show the principal part of the gravure printing apparatus which has the paste supply apparatus which concerns on one Embodiment of this invention. (A), (b) is typical sectional side view which shows the modification of the paste supply apparatus which concerns on one Embodiment of this invention. 1 is a schematic configuration diagram showing a gravure printing apparatus having a paste supply apparatus according to an embodiment of the present invention. The side view of the paste supply apparatus for demonstrating the modification from which a side seal consists of a some sealing material. Side surface sectional drawing which shows the principal part of the gravure printing apparatus which has the paste supply apparatus which concerns on another embodiment of this invention. Side surface sectional drawing which shows an example of the principal part of the gravure printing apparatus which has the conventional paste supply apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Gravure printing apparatus 2 ... Paste supply apparatus 3 ... Doctor chamber 3a ... Downstream edge part 3b ... Upstream edge part 3c, 3d ... 1st, 2nd side surface 4 ... Doctor blade 4a, 4b ... 1st 2nd side surface 5 ... Seal blade 6 ... Plate cylinder 6a, 6b ... 1st, 2nd side surface 6c ... Recess 6d ... Print image line part 6e ... Near the lowest point 7 ... Paste 8 ... Inner surface 8a ... Paste pool part 9 ... outer peripheral surface 10 ... side seal 10d ... tip 10A, 10B, 10C ... sealing material 11 ... sealing film 12 ... paste supply port 13 ... sensor 15 ... discharge port 31 ... substrate 32a ... unwinding part 32b ... winding part 33 ... Impression cylinder 34 ... Drying furnace 35a-35m ... Roller 41 ... Gravure printing device 42 ... Paste supply device 43 ... Holding member 44 ... Holding member E ... Interval L1 ... Doctor chamber Dimension in the direction L2: Dimension in the width direction of the printed image portion L3: Dimension in the width direction of the plate cylinder L4: Dimension in the width direction of the doctor blade L5: Dimension in the width direction of the seal blade X: Swing device x: Tangential line y … Tangent line θ… center angle θx… contact angle θy… contact angle

Claims (9)

A paste supply apparatus for supplying a paste for printing an internal electrode pattern on a ceramic green sheet on a plate cylinder used for gravure printing,
A doctor chamber having a paste reservoir in which paste is stored on the inner surface facing the outer surface of the plate cylinder;
A doctor blade abutting on the outer surface of the plate cylinder to scrape off excess paste adhering to the plate cylinder;
A space is provided between the outer surface of the plate cylinder and the inner surface of the doctor chamber,
The interval is narrowest near the lowest point of the plate cylinder;
The interval is widened in a continuous and / or stepwise manner from the vicinity of the lowest point of the plate cylinder to the upper part, and is located downstream of the paste liquid flow generated when the plate cylinder rotates. The paste supply apparatus, wherein the gap at the end of the doctor chamber is wider than the gap at the end of the doctor chamber located on the upstream side of the paste. The interval at the end of the doctor chamber located on the downstream side of the liquid flow of the paste generated when the plate cylinder rotates is 20 to 40 mm, and the end of the doctor chamber located on the upstream side of the paste The paste supply apparatus according to claim 1, wherein the interval is in a range of 5 to 10 mm .   The paste supply apparatus according to claim 1 or 2, wherein the doctor blade is detachably attached by a holding member different from the doctor chamber. In order to prevent the paste attached to the plate cylinder from returning to the paste reservoir, further comprising a seal blade that is in contact with the outer surface of the plate cylinder,
The central angle of the plate cylinder on the paste reservoir side from the contact point between the plate cylinder and the doctor blade to the contact point between the plate cylinder and the seal blade is in the range of 220 ° to 315 °,
And the paste supply apparatus of any one of Claims 1-3 with which the space which has the said paste storage part is interrupted | blocked with the external space.   The doctor chamber is a non-circular doctor chamber that retains paste in the paste reservoir and supplies the paste to the outer surface of the plate cylinder by immersing the plate cylinder in the retained paste. The paste supply device according to any one of 4.   The paste according to any one of claims 1 to 5, further comprising a rocking device connected to the doctor chamber so as to rock the doctor chamber with respect to the axial direction of the plate cylinder. Feeding device.   The said rocking | swiveling device is connected to the said doctor chamber and the said doctor blade so that the said doctor chamber and the said doctor blade may rock | fluctuate synchronously, The any one of Claims 1-6 characterized by the above-mentioned. The paste supply apparatus of Claim 1.   A paste supply device according to any one of claims 1 to 7, a plate cylinder, and a pressure drum that presses the printed material from the back side of the printed material pressed against the plate cylinder. , Gravure printing equipment.   An internal electrode pattern is printed on a long ceramic green sheet using the paste supply device according to any one of claims 1 to 7, and a method for producing a multilayer ceramic electronic component.

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