JP2013111973A - Gravure printing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a printing poor section from being formed constantly, and to enable the reliability of a printing accuracy to be improved more.SOLUTION: The gravure printing apparatus includes a plurality of supporting rollers which support a printing sheet moved at a high speed, an impression cylinder roller which is formed between the supporting rollers and pressurizes the printing sheet to a lower part, a defect detecting means which detects defects of the printing sheet before moved to the impression cylinder roller, and a gravure part which is disposed opposite to the impression cylinder roller via the printing sheet and moves in response to a signal transmitted from the defect detecting means to print an electrode pattern excluding a defective portion to the printing sheet. The productivity is improved. The invention also has the effect of reducing production costs. Moreover, it has the effects of reducing equipment manufacturing costs and maintenance costs.

Description

  The present invention relates to a gravure printing apparatus, and more particularly to an apparatus capable of separating or contacting a gravure roll and an impression cylinder roll depending on the presence or absence of defects on the printed sheet. Therefore, the present invention relates to a printing apparatus that can improve the reliability of printing accuracy without causing a defective printing section constantly.

  In recent years, downsizing and weight reduction have attracted attention as very important technical elements in electronic products and electronic parts related to the electronic products. Therefore, there is a strong demand to increase the wiring density of the substrate and reduce the size and weight of individual components or modules, and new component manufacturing techniques have been proposed to meet such demands.

  In a manufacturing process of a multilayer ceramic electronic component such as MLCC (Multi-layer Ceramic Capacitor), an internal electrode is formed by a screen printing method. Such screen printing is applied to mass production because it can easily form a pattern and is suitable for a roll-to-roll process.

  On the other hand, recently, a gravure printing method has been proposed for the purpose of performance improvement and cost reduction. Here, in the gravure printing method, the concave pattern portion formed on the roll surface is filled with a conductive paste, and the unnecessary pattern paste is removed from the roll surface, and the ink in the concave pattern portion is applied to the printed material by printing pressure. This is one of the intaglio printing methods to be transferred, and has an advantage of excellent productivity because the transfer speed of the roll is several tens of times faster than the existing screen printing method.

  When printing electrodes for electronic parts by such a gravure printing method, not only the uniformity of the entire printed surface but also the microscopic uniformity inside each pattern is required, and more precise control than existing screen printing is required. Required.

  In particular, the gravure printing method forms a thin printed layer at a high speed, so if there is a defect in the printed sheet, it must be detected and printed out by removing the defective part. There is a need for an apparatus and method that can prevent this.

  In the conventional screen printing method, when a foreign matter defect or pinhole defect of a printed sheet is detected by the camera device during the printing process, the operation of the printing squeegee is stopped, and only the defective sheet is transferred, so that the defective portion Passed without printing.

  In the above screen printing method, since printing is performed discontinuously with the printing sheet stopped, there is no problem with a low-speed printing apparatus, but the printing sheet moves at a speed of several tens of meters per minute at the same time. In a gravure printing apparatus in which printing is performed continuously, there is a problem that it is virtually impossible to stop the operation every time a defect is found.

  In order to solve such problems, when detecting a defect in the printing sheet, after passing the defective part by separating the impression cylinder roll that was in close contact with the gravure roll and applied the pressure bonding force, A configuration in which an impression cylinder roll is brought into close contact with a gravure roll to apply a pressing force is disclosed. However, since the moving print sheet is a system in which the impression cylinder roll moves up and down with respect to the gravure plate cylinder at a fixed position, the movement path of the print sheet is changed. The resulting instantaneous change in tension of the printed sheet occurs. At this time, since there is a time loss from the change in tension of the printing sheet until it returns to the normal printing state, a loss of the printing sheet occurs, and there are unprinted parts in addition to defective parts. There is a problem that a printing defect occurs.

Korean Patent Publication 10-2008-0042206 Korean Patent Publication 10-2010-0110113

  The present invention proposed to solve the above-mentioned problems is a high-speed printing apparatus that performs continuous printing, and detects a defect in a print sheet in advance, and the corresponding defective portion without stopping the apparatus. It is an object of the present invention to provide a gravure printing apparatus capable of printing except for the above.

  Another object of the present invention is to provide a gravure printing apparatus that can continuously print without changing the tension of a continuously supplied printing sheet.

  Another object of the present invention is to provide a gravure printing apparatus capable of separating a pressure roll and a gravure roll without a separate additional device.

  To achieve the above object, a gravure printing apparatus according to an embodiment of the present invention includes a plurality of support rolls that support a print sheet that moves at high speed, and a pressure that pressurizes the print sheet downward. A moving roll, a defect detecting means for detecting a defect of the print sheet before moving to the pressure roll, and arranged facing the pressure roll via the printing sheet, and transmitted from the defect detecting means. And a gravure portion that moves in response to a signal and prints an electrode pattern on the print sheet except for a defective portion.

  Here, the gravure unit is a gravure roll that prints a conductive paste on a printing sheet while rotating, and a driving unit that is formed at both ends of the gravure roll to support a central axis and raise or lower the gravure roll. , Can be included.

  At this time, the gravure roll may be formed with a concave electrode pattern so that a conductive paste is applied to the outer peripheral surface.

  The driving unit may be formed of a non-contact bearing.

  At this time, the non-contact bearing may be either an aerostatic bearing or a magnetic bearing.

  On the other hand, the drive unit includes a displacement sensor that measures a center axis position of the gravure roll, a gravure roll according to a center axis position of the gravure roll measured by the displacement sensor and a signal transmitted from the defect detection means. And a control unit for controlling.

  The driving unit may further include a pressure sensor that measures a pressure at which the gravure roll presses the impression cylinder roll.

  Further, the gravure roll and the impression cylinder roll can rotate at the same speed.

  The defect detection unit may include a light source that emits light and a camera that captures the print sheet.

  Here, the camera may further include a signal transmission unit that calculates a time at which a defective portion on the printing sheet arrives at the impression drum roll and the gravure unit and transmits a signal.

  In order to achieve the above object, a gravure printing apparatus according to an embodiment of the present invention detects a defect in a printing sheet moving at high speed in advance, and when a defect is detected, only the relevant defective portion is detected without stopping the apparatus. Since it can be printed except for, there is an effect of improving productivity.

  In addition, since the gravure roll moves up and down and is separated from the pressure roll, there is no change in the moving path of the print sheet and there is no change in tension, so there is no need for time to return to the normal printing state. By minimizing the part that is not done and the part that is inferior in print quality, the production cost can be reduced.

  Moreover, since the gravure roll moves up and down by the non-contact bearing, the pressure roll and the gravure roll can be separated without another additional device, so that the equipment manufacturing cost and the maintenance cost can be reduced. is there.

1 is a side view schematically showing a gravure printing apparatus according to an embodiment of the present invention. 1 is a partial perspective view schematically showing a gravure printing apparatus according to an embodiment of the present invention. 1 is a front view schematically showing a gravure printing apparatus according to an embodiment of the present invention. 1 is a front view schematically showing a gravure printing apparatus according to an embodiment of the present invention. It is sectional drawing which showed the gravure part roughly. It is the sectional side view which showed the gravure part. It is the block diagram which showed the internal structure of the drive part.

  Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. However, this is merely an example, and the present invention is not limited to this.

  In describing the present invention, when it is determined that a specific description of a known technique related to the present invention may obscure the gist of the present invention, a detailed description thereof will be omitted. The terms described later are terms defined in consideration of the functions in the present invention, and can be changed according to the intention or custom of the user or operator. Therefore, the definition should be based on the contents throughout this specification.

  The technical idea of the present invention is determined by the scope of the claims, and the following embodiments are merely one means for efficiently explaining the technical idea of the present invention to those who have ordinary knowledge in the technical field to which the present invention belongs. Absent.

  Hereinafter, an embodiment of a gravure printing apparatus according to the present invention will be described in detail with reference to FIGS. 1 to 7 attached.

  FIG. 1 is a side view schematically showing a gravure printing apparatus according to an embodiment of the present invention, and FIG. 2 is a partial perspective view schematically showing a gravure printing apparatus according to an embodiment of the present invention. FIG. 4 is a front view schematically showing a gravure printing apparatus according to an embodiment of the present invention.

  As shown in FIGS. 1 to 4, a gravure printing apparatus according to an embodiment of the present invention is formed between a plurality of support rolls 10 that support a printing sheet S that moves at high speed, and the support rolls 10. A pressure drum roll 20 that pressurizes the sheet S downward, a defect detection means 30 that detects defects in the print sheet S before moving to the pressure drum roll 20, and the pressure drum roll 20 via the print sheet S. And a gravure unit 40 that is arranged oppositely and moves according to a signal transmitted from the defect detection means 30 and prints an electrode pattern P on the print sheet S except for a defective part.

  The support roll 10 is a cylindrical roll member that supports the printing sheet S that moves at high speed. A plurality of the supporting rolls 10 may be formed to support the lower part of the printing sheet S and guide the moving direction. .

  Here, the printing sheet S is a ceramic green sheet, preferably a ceramic green sheet backed by a carrier film.

  The impression cylinder roll 20 may be formed between the support rolls 10 so as to press the printing sheet S downward. At this time, the impression cylinder roll 20 is connected to a piston of a cylinder, pressurizes the printing sheet S downward by vertical movement of the piston, and maintains a constant contact pressure applied in a state where the movement path is changed. . Thereby, the electrode pattern P is printed by the electrode pattern P being in line contact with the gravure portion 40 and being pressed in a state where the tension of the print sheet S is kept constant.

  At this time, the impression cylinder roll 20 is formed to have the same width as the width of the printing sheet S or a slightly narrower width, and can press the printing sheet S.

  The defect detection means 30 is for detecting a defect of the printing sheet S before moving to the impression drum roll 20. Here, the defect detection unit 30 may be provided at a predetermined distance from the impression drum roll 20 and on the front side opposite to the moving direction of the printing sheet S. That is, printing is performed after first detecting the presence or absence of defects in the printing sheet S, and such a printing process can be continuously performed in accordance with the printing sheet S moving at high speed. .

  Here, the defect detection means 30 can be composed of a light source 31 that emits light and a camera 32 that captures the print sheet S moving at high speed.

  At this time, the light source 31 is formed on the upper side of the print sheet S and emits light in the lower direction, and the camera 32 formed on the lower side of the print sheet S receives the light transmitted through the print sheet S. Here, when the illuminance of light transmitted through the print sheet S changes due to foreign matter defects or pinhole defects on the print sheet S, the camera 32 determines that the print sheet S is defective and generates a signal.

  On the other hand, a predetermined time difference occurs until the defective portion of the print sheet S detected by the camera 32 reaches the impression drum roll 20. At this time, the signal transmission unit 33 connected to the camera 32 calculates a time until the defective part arrives at the pressure roll 20 and transmits a signal generated from the camera 32. The time difference until reaching the impression drum roll 20 can be eliminated.

  In the preferred embodiment according to the present invention, it has been described that the defect detection means 30 includes the light source 31 and the camera 32. However, the present invention is not limited to this, and the defect detection means 30 may be detected by a laser or an ultrasonic device.

  FIG. 5 is a cross-sectional view schematically showing the gravure part, FIG. 6 is a side cross-sectional view showing the gravure part, and FIG. 7 is a block diagram showing the internal configuration of the drive part.

  As shown in FIGS. 5 to 7, the gravure unit 40 includes a gravure roll 41 disposed to face the impression cylinder roll 20 via the printing sheet S, and a drive for raising or lowering the gravure roll 41. Part 42.

  Here, the gravure roll 41 is a cylindrical roll member that is coated with a conductive paste on its outer peripheral surface and prints an electrode pattern P on a printing sheet S that moves at high speed, and has the same width as the impression cylinder roll 20. It can be formed with a width or a slightly narrow width.

  At this time, a concave electrode pattern P is formed on the outer peripheral surface of the gravure roll 41 and a conductive paste is applied. The conductive paste remaining after filling the electrode pattern P is in contact with the surface of the gravure roll 41. It is scraped off by a doctor blade 50 formed on one side.

  Here, the conductive paste applied to the gravure roll 41 can be applied to the gravure roll 41 via a supply device (not shown), and the storage unit (not shown) filled with the conductive paste is a gravure. It is also possible to form the gravure roll 41 in the lower part of the roll 41 and to be immersed in the storage part.

  That is, the printing which moves between the gravure roll 41 and the impression cylinder roll 20 by the pressure applied to the impression cylinder roll 20 by the gravure roll 41 arranged to face the impression cylinder roll 20 via the printing sheet S. An electrode pattern P can be printed on the surface of the sheet S.

  Here, it is preferable that the gravure roll 41 rotates at the same speed as the impression cylinder roll 20 disposed so as to face the print sheet S. Further, the gravure roll 41 may continue to rotate at the same speed as when the electrode pattern is printed on the printing sheet S while being separated from the printing sheet S pressed by the impression cylinder roll 20. . If the printing sheet S continues to rotate at the same speed, the printed pattern S has the same spacing between the front and rear electrode patterns, regardless of whether the printed sheet S is defective or not, improving the convenience of the finished printed sheet. To do.

  On the other hand, the drive unit 42 supports both ends of the gravure roll 41 and rotates and raises or lowers the gravure roll 41 so that the electrode pattern P is printed on the printing sheet S, and is non-contact. It can be formed with a bearing. The non-contact bearing may be an aerostatic bearing or a magnetic bearing.

  At this time, as shown in FIG. 6A, the drive unit 42 is composed of an inner ring 43 and an outer ring 44, and a center axis of the gravure roll 41 is inserted and coupled to the inner ring 43, and the drive unit 42. Is separated from the outer ring 44 and is located in the center. Here, when a defect is detected, the inner ring 43 of the drive unit 42 is lowered as shown in FIG. 6B, and when there is no defect, the inner ring 43 is raised as shown in FIG. 6C. When the non-contact bearing is an aerostatic bearing, each convex portion toward the inner ring 43 of the outer ring 44 may be a nozzle that discharges air, and the air pressure is adjusted by adjusting the amount of air discharged from each nozzle. The inner ring 43 is moved up and down without contacting the outer ring 44. In the case of a non-contact bearing magnetic bearing, each convex portion of the outer ring 44 facing the inner ring 43 may be a conductive core wound with a coil, and the magnetic charge is adjusted by adjusting the amount of current flowing through each coil. The inner ring 43 is moved up and down without contacting the outer ring 44.

  The driving unit 42 may include a displacement sensor 45 and a control unit 46 as shown in FIG.

  Here, the displacement sensor 45 measures the position of the inner ring 43 to which the central axis of the gravure roll 41 is coupled, and transmits the measured position to the control unit 46. At this time, the control unit 46 raises or lowers the position of the inner ring 43 according to the position of the inner ring 43 transmitted from the displacement sensor 45 and the signal transmitted from the signal transmission unit 33 of the defect detection means 30. As a result, the center axis of the gravure roll 41 coupled to the inner ring 43 is raised or lowered, and the electrode pattern P is printed on the printing sheet S or printing is avoided.

  That is, the drive unit 42 formed of the non-contact bearing grasps the position of the inner ring 43 by the displacement sensor 45 and controls the position of the inner ring 43 by the control unit 46 so that the inner ring 43 is moved up and down inside the outer ring 44. Move it a predetermined amount. As a result, the gravure roll 41 coupled to the inner ring 43 is moved up and down by a predetermined amount, and the electrode pattern P is printed on the printing sheet S moving between the impression cylinder roll 20 and the gravure roll 41 or printing avoidance is performed. Will be. As described above, since the high-precision control of the gravure roll 41 can be instantaneously performed, printing can be performed by removing only a minimum defective portion, and there is an advantage that the manufacturing cost can be reduced and the productivity can be improved. is there.

  In addition, the drive unit 42 has an advantage that a control unit 46 that is a programmable logic controller (PLC) is formed therein, and another control device for controlling the drive unit 42 can be omitted.

  Further, the drive unit 42 is formed with a pressure sensor 47 that measures the pressure with which the gravure roll 41 presses the impression cylinder roll 20, and when the gravure roll 41 presses the impression cylinder roll 20 with an excessive pressure. Since the pressure is controlled by controlling the position of the inner ring 43, the print sheet S or the printing apparatus can be prevented from being damaged.

  That is, the continuously supplied printing sheets S are inspected by the defect detection means 30, and when a defect is detected, a signal is transmitted to the control unit 46 of the drive unit 42 via the signal transmission unit 33, and the defective portion is detected. The inner ring 43 combined with the central axis of the gravure roll 41 is lowered in accordance with the arrival time, whereby the pressure roll 20 and the gravure roll 41 are separated, and the electrode pattern P is printed on the defective portion. Pass without. Thereafter, the gravure roll 41 rises again after the defective portion passes and is pressure-bonded to the impression cylinder roll 20, so that even if there is a defective portion, the printing process is continuously performed without stopping, There is an effect of improving the property.

  Therefore, it is possible to detect a defect in a printing sheet that moves at high speed in advance, and when the defect is detected, it is possible to perform printing by removing only the defective part without stopping the apparatus. The time required to return to the printing state is unnecessary, and there is an effect that productivity is improved by minimizing a portion where printing is not performed and a portion where printing quality is poor. In addition, since the pressure roll and the gravure roll can be separated without another additional device such as a cylinder, there is an effect that the equipment manufacturing cost and the maintenance cost can be reduced.

  As described above, the present invention has been described in detail with reference to the representative embodiments. However, a person having ordinary knowledge in the technical field belonging to the present invention may depart from the scope of the present invention with respect to the above-described embodiments. It will be understood that various modifications are possible within the limits.

  Therefore, the scope of rights of the present invention should not be limited to the above-described embodiments, but should be determined not only by the claims described later but also by the equivalents to the claims.

DESCRIPTION OF SYMBOLS 10 Support roll 20 Impression cylinder roll 30 Defect detection means 31 Light source 32 Camera 33 Signal transmission part 40 Gravure part 41 Gravure roll 42 Drive part 43 Inner ring 44 Outer ring 45 Displacement sensor 46 Control part 47 Pressure sensor 50 Doctor blade P Electrode pattern S Print sheet

Claims (10)

A plurality of support rolls for supporting the moving printing sheet;
An impression cylinder roll formed between the support rolls and pressurizing the printing sheet;
Detecting defects in the printing sheet on the upstream side of the impression drum roll, and defect detection means for transmitting a signal;
A gravure that is arranged to face the impression cylinder roll via the printing sheet, moves according to a signal transmitted from the defect detection means, and prints an electrode pattern on the printing sheet excluding the defective portion Gravure printing device including The gravure part is
A gravure roll having a central axis and printing a conductive paste on a printing sheet while rotating;
The gravure printing apparatus according to claim 1, further comprising: a drive unit that is formed at both ends of the gravure roll to support the central axis and raise or lower the gravure roll.   The gravure printing apparatus according to claim 2, wherein the gravure roll has a concave electrode pattern formed so that a conductive paste is applied to an outer peripheral surface.   The gravure printing apparatus according to claim 2, wherein the driving unit has a non-contact bearing.   The gravure printing apparatus according to claim 4, wherein the non-contact bearing is one of an aerostatic bearing and a magnetic bearing. The drive unit is
A displacement sensor for measuring the position of the central axis of the gravure roll;
The control part which controls the said gravure roll according to the position of the said center axis | shaft measured by the said displacement sensor, and the signal transmitted from the said defect detection means. Gravure printing device.   The gravure printing apparatus according to claim 2, wherein the driving unit further includes a pressure sensor that measures a pressure with which the gravure roll presses the impression cylinder roll.   The gravure printing apparatus according to claim 2, wherein the gravure roll and the impression cylinder roll rotate at the same speed.   The gravure printing apparatus according to any one of claims 1 to 8, wherein the defect detection unit includes a light source that emits light and a camera that photographs the print sheet.   The gravure printing apparatus according to claim 9, wherein the camera further includes a signal transmission unit that calculates a time at which a defective portion on the printing sheet arrives at the impression drum roll and the gravure unit and transmits a signal.

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