KR20130067699A - Gravure printing apparatus - Google Patents

Abstract

PURPOSE: A gravure printing device is provided to correct a pattern printed state on a real time basis and correct the same by increasing a recognition rate of a reference line printed on the printing sheet through a reference line cell of a continuous line shape formed in each gravure roll, thereby improving the accuracy of overlapping patterns on the printing sheet. CONSTITUTION: A gravure printing device comprises a gravure roll(20), a driving unit(30), a supporting roll(40), a sensing member, and a control unit. The driving unit supports both ends of the gravure roll and rotates. The supporting roll is arranged to be faced the gravure roll by a medium of a printing sheet and supports the printing sheet. The sensing member is formed in one side of the supporting roll, thereby sensing an align mark and a reference line. The control unit controls the gravure roll according to errors of the align mark and the reference line sensed by the sensing unit.

Description

Gravure printing device {GRAVURE PRINTING APPARATUS}

The present invention relates to a gravure printing apparatus, and more particularly, to a gravure printing apparatus capable of continuously printing an electrode pattern on a printing sheet.

Recently, miniaturization and weight reduction of electronic products and related electronic components have emerged as an important technology element. To this end, it is necessary to increase the wiring density of the board and to reduce the size and weight of individual components or modules, and new component manufacturing techniques have been proposed to meet these demands.

In the process of manufacturing multilayer ceramic electronic components such as multi-layer ceramic capacitors (MLCC), internal electrodes are mainly used for mass production by screen printing.

Recently, a gravure printing method has been proposed for the purpose of performance improvement and cost reduction. Here, the gravure printing method is a negative printing method in which the conductive paste is filled in the concave pattern portion formed on the surface of the roll and the ink of the concave pattern portion is transferred to the to-be-printed object by the pressure while removing unnecessary paste on the roll surface. Compared to the screen printing method, the printing speed is tens of times faster, so the productivity is excellent.

In the case of printing an electrode for an electronic component by such a gravure printing method, not only the uniformity of the entire printing surface but also the microscopic uniformity inside each pattern is required, and more precise mechanism control is required than conventional screen printing.

In particular, in the gravure printing method, when a printing sheet of a dielectric or a conductor is continuously printed, tension is applied to the printing sheet as a to-be-printed object through a plurality of rolls. As a result, when the tension between the prints is not uniform, a problem occurs that an error in which the electrode pattern is displaced is issued.

Conventionally, in order to solve the above-mentioned problem, in order to correct printing misalignment, each polygonal shape mark is printed in each print area of each layer, and image processing is performed by measuring the alignment marks printed on each layer with a camera. Although a method of controlling the overlapping precision has been proposed, it has been developed to a level applicable to soft packaging or letterpress printing, and in the case of overlapping printing of electronic devices, higher precision is required.

KR 10-2004-0011789 A

The present invention proposed to solve the above problems is an object of the present invention to provide a gravure printing device that can increase the overlapping accuracy and printing resolution of the electrode pattern in a high-speed printing device that is continuously printed.

Another object of the present invention is to provide a gravure printing apparatus that can reduce the error of the electrode pattern, and maintain an appropriate printing pressure.

A gravure printing apparatus according to an embodiment of the present invention for achieving the above object is a gravure roll for printing a pattern, an alignment mark and a reference line on a printing sheet, a driving unit for supporting and rotating both ends of the gravure roll, the printing sheet Arranged to face the gravure roll through the support, and a support roll for supporting the printing sheet, formed on one side of the support roll to detect the alignment mark and the reference line and the alignment mark detected by the detection means and And a controller for controlling the gravure roll according to an error of a reference line.

Here, the reference line may be formed in the dummy region except for the region in which the pattern is formed in a line shape.

In addition, the gravure roll may have a pattern cell, an alignment mark cell, and a baseline cell in an intaglio form.

On the other hand, the alignment mark may be formed to be spaced apart by a predetermined interval.

In addition, the reference line may be formed to be parallel to each other at a predetermined interval.

The drive unit may be formed as a non-contact bearing.

Here, the driving unit may move the gravure roll in the vertical direction, left and right, front and rear, oblique direction.

In addition, the non-contact bearing may be one of an air static bearing or a magnetic bearing.

On the other hand, the drive unit may further include a displacement sensor for detecting the position of the gravure roll.

In addition, the control unit may store in advance a print setting value in which the distance between the alignment marks and the distance between the reference lines are set.

Here, the control unit may calculate an error by comparing the distance between the alignment marks and the reference line detected by the sensing means with the print setting value stored in the control unit, and move the gravure roll through the driving unit by the error.

The apparatus may further include a guide roll for guiding the transfer path of the printing sheet and a drying furnace for drying the pattern printed on the printing sheet.

In addition, the gravure roll may further include a supply means for supplying a conductive paste or a dielectric paste.

The gravure printing apparatus according to the embodiment of the present invention for achieving the above object is to increase the recognition rate of the reference line printed on the printing sheet through the continuous line-shaped baseline cells formed on each gravure roll to detect the pattern printing state in real time By correcting the above, there is an effect that the pattern overlapping accuracy of the printing sheet can be increased.

In addition, by driving the gravure roll with a non-contact bearing that can move not only up and down, but also in all directions, such as left, right, front, and oblique directions, it is possible to finely flow for correction of printing errors and to maintain an appropriate printing pressure. There is an effect of improving the quality and uniformity.

1 is a side view schematically showing a gravure printing apparatus according to an embodiment of the present invention.
Figure 2 is a front view schematically showing a gravure printing apparatus according to an embodiment of the present invention.
3 is a perspective view showing a gravure roll.
4 is a sectional view showing a driving unit.
Figure 5 is a side cross-sectional view showing a drive unit.
6 to 9 are plan views showing various forms of a printing sheet printed through a gravure printing apparatus.

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 thereto.

In the following description, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions of the present invention, and may be changed according to the intentions or customs of the user, the operator, and the like. Therefore, the definition should be made based on the contents throughout this specification depending on how the operation thereof.

The technical idea of the present invention is determined by the claims, and the following embodiments are merely a means for effectively explaining the technical idea of the present invention to a person having ordinary skill in the art to which the present invention belongs.

Hereinafter, an embodiment of a gravure printing apparatus according to the present invention will be described in detail with reference to the accompanying drawings of FIGS. 1 to 6.

1 is a side view schematically showing a gravure printing apparatus according to an embodiment of the present invention, Figure 2 is a front view schematically showing a gravure printing apparatus according to an embodiment of the present invention, Figure 3 is a perspective view showing a gravure roll, 4 is a cross-sectional view showing the drive unit, Figure 5 is a side cross-sectional view showing the drive unit.

1 to 5, the gravure printing apparatus according to the embodiment of the present invention, the gravure roll 20, which prints the pattern 22a, the alignment mark 23a and the reference line 21a on the printing sheet 10, 120, the driving units 30 and 130 supporting and rotating both ends of the gravure rolls 20 and 120, and the gravure rolls 20 and 120 through the printing sheet 10, are disposed to face each other. Support rolls 40 and 140 supporting the printing sheet 10 and sensing means 50 formed on one side of the support rolls 40 and 140 to detect the alignment marks 23a and the reference line 21a. And a controller 60 for controlling the gravure roll 120 according to an error between the alignment mark 23a and the reference line 21a detected by the sensing means 50.

In the gravure printing apparatus according to the embodiment of the present invention, a plurality of gravure rolls 20 and 120 and support rolls 40 and 140 mediate the printing sheet 10 in order to print the patterns on the printing sheet 10 to be stacked. It may be formed to correspond to, and may be arranged to print on one side of the printing sheet (10).

In addition, a plurality of guide rolls 70 may be formed to guide the movement path of the printing sheet 10.

Here, the number of the gravure rolls 20 and 120 and the support rolls 40 and 140 is formed to correspond to the number of times of lamination printing.

Here, the printing sheet 10 is a ceramic green sheet, and preferably, may be formed of a ceramic green sheet arranged by a carrier film, and supplied to the gravure printing apparatus in the direction of the arrow in the drawing to guide the guide roll 70. Accordingly, it may be moved between the first gravure roll 20 and the first support roll 40.

The first gravure roll 20 is a cylindrical roll for printing the pattern 22a, the alignment mark 23a and the reference line 21a by pressing the printing sheet 10 moving at high speed by the first driving unit 30. The member may be formed with a pattern cell 22, an alignment mark cell 23 and a reference line cell 21 on the outer circumferential surface of the member.

The pattern cell 22 is for printing the pattern 22a on the printing sheet 10, and may be formed in an intaglio recess. At this time, the shape of the pattern cell 22 is preferably formed in the shape of the internal electrode required in the multilayer ceramic electronic component.

The reference line cell 21 may be engraved and recessed in a continuous line shape along the circumferential direction of the first gravure roll 20, and may be formed one or more than one. In addition, the pattern cell 22 is formed in a region where the pattern cell 22 is not formed, and may be formed on one side or the other side of the first gravure roll 20 or both sides.

The alignment mark cell 23 is for printing an alignment mark 23a for detecting an error on the print sheet 10, and may be formed concave in an intaglio spaced apart from the reference line cell 21 by a predetermined interval. The pattern cell 22 may be formed on one side or the other side of the first gravure roll 20, which is a region where the pattern cell 22 is not formed, or on both sides. In the present invention, the alignment mark cell 23 is formed in a triangular shape, but may be formed in any shape without being limited thereto.

Meanwhile, the first gravure roll 20 may be immersed in the first supply part 25 having the conductive paste or the dielectric paste filled therein to apply the conductive paste or the dielectric paste. In this case, the conductive paste or the dielectric paste applied from the first supply part 25 fills the pattern cell 22, the alignment mark cell 23, and the reference line cell 21, and the pattern cell 22 and the alignment mark cell ( 23 and the excess conductive paste or dielectric paste remaining after filling the baseline cell 21 is removed by a doctor blade 24 formed in contact with the surface of the first gravure roll 20.

Here, the plurality of supply parts 25 and 125 in which the gravure rolls 20 and 120 are deposited are formed so that the conductive paste and the dielectric paste are alternately filled, so that the conductive paste and the dielectric paste are alternately printed on the printing sheet 10. desirable.

The first driving unit 30 supports and rotates both ends of the first gravure roll 20, raises the first gravure roll 20, and prints a pattern 22a and an alignment mark on the printing sheet 10. 23a) and the reference line 21a are printed.

Here, the first driving part 30 may be formed as a non-contact bearing, and the non-contact bearing may be formed as one of an air static pressure bearing or a magnetic bearing.

At this time, the first driving unit 30 is composed of the inner ring 32 and the outer ring 31, the central axis of the first gravure roll 20 is inserted into the inner ring 32, the inner ring 32 Is spaced apart from the outer ring 31 is located in the center of the outer ring (31). In addition, a displacement sensor (not shown) capable of measuring the position of the inner ring 32 may be formed in the first driving part 30.

The first support roll 40 may be disposed to face the first gravure roll 20 via the printing sheet 10. Here, the first support roll 40 may be fixed by the support part 41 to support the pressing force of the first gravure roll 20 by a cylindrical roll member. At this time, the support portion 41 may be formed to support the pressing force of the first gravure roll 20 by pressing the printing sheet 10 at a constant pressure formed of a cylinder and a piston.

The printing sheet 10 in which the paste is printed by the first gravure roll 20 and the first supporting roll 40 may be moved to the first drying furnace 80 according to the guide roll 70. Here, the first drying furnace 80 is to dry the paste printed on the printing sheet 10 may be provided with a heater.

The sensing means 50 is for sensing the alignment mark 23a and the reference line 21a printed on the printing sheet 10 and may be formed by a camera and an image processing apparatus. The alignment mark 23a and the reference line 21a may be used. ) Can be detected. Here, the sensing means 50 may be formed at one or both of the front and rear of the gravure roll (20, 120) or before and after.

In this case, the alignment mark 23a and the reference line 21a may be conductors or non-conductors depending on the paste to be printed. Accordingly, the sensing means 50 is formed of an electromagnetic sensor (for example, Eddy current sensor, Capacitance sensor) in addition to the camera and the image processing apparatus used in the present embodiment, the alignment mark 23a formed of a conductor or an insulator and The reference line 21a can be detected.

On the other hand, the alignment mark 23a and the reference line 21a detected by the sensing means 50 are transmitted to the control unit 60.

The control unit 60 may include a distance D2 between the reference line 21a printed by the first gravure roll 20 and the reference line 121a to be printed by the second gravure roll 120 and the first gravure roll 20. The print setting value in which the distance D1 between the alignment mark 23a printed by the alignment mark 123a and the alignment mark 123a to be printed by the second gravure roll 120 is set is stored in advance. The second driving unit 130 is controlled to print the pattern 122a, the alignment mark 123a, and the reference line 121a of the second gravure roll 120 on the print sheet 10.

In this case, in the second gravure roll 120, the pattern cell 122, the alignment mark cell 123, and the reference line cell 121 may be formed in an intaglio like the first gravure roll 20. The distance D1 between the alignment mark 23a printed by the gravure roll 20 and the alignment mark 123a printed by the second gravure roll 120 is preferably 20 mm.

In addition, the second driving unit 130 is composed of an inner ring 32 and an outer ring 31, similarly to the first driving unit 30, and positions the position of the inner ring 32 through a displacement sensor (not shown) formed therein. It can be measured.

That is, the second driving unit 130 moves the second gravure roll 120 coupled to the inner ring 32 under the control of the control unit 60 and presses the second supporting roll 140 to the second support roll 140. The pattern 122a, the alignment mark 123a, and the reference line 121a may be printed on the printing sheet 10 passing between the gravure roll 120 and the second support roll 140 without error with respect to the print setting value. have.

Therefore, the second gravure roll 120 may be moved in all directions through the second driving unit 130 formed of a non-contact bearing capable of moving in all directions such as up, down, left, right, front and rear, oblique directions, and the like, and fine adjustment is possible. In addition, since the proper printing pressure can be maintained, the printing quality can be improved and the uniformity can be increased.

A printing method of a printing sheet using a gravure printing apparatus according to an embodiment of the present invention will be described with reference to the drawings.

First, the pattern 22a, the alignment mark 23a and the reference line 21a are printed on the printing sheet 10 through the first gravure roll 20 and the first support roll 40.

Subsequently, when the detecting means 50 detects the alignment mark 23a and the reference line 21a and transmits them to the control unit 60, the control unit 60 controls the second driving unit 130 according to a pre-stored print setting value. By controlling the pattern 122a, the alignment mark 123a and the reference line 121a of the second gravure roll 120 is printed.

Next, when the sensing means 50 detects the distance D1 between the reference lines 21a and 121a of the printing sheet 10 and the distance D2 between the alignment marks 23a and 123a and transmits the same to the controller 60. The controller 60 compares the previously stored print setting value.

When the distance D1 between the reference lines 21a and 121a does not match the print setting value, the controller 60 determines that the alignment of the print sheet 10 in the width direction TD is misaligned, and the alignment mark ( If the distance (D2) between the 23a, 123a does not match the print setting value, it is determined that the alignment of the print sheet 10 in the advancing direction (MD) is misaligned, and the error is calculated. The process is repeated.

 6 to 9 are plan views illustrating various forms of a printing sheet printed through a gravure printing apparatus.

6 to 9, the print sheet 10 may be printed with patterns 22a and 122a, alignment marks 23a and 123a, and reference lines 21a and 121a.

In this case, the alignment marks 23a and 123a may be formed in various forms, and may be printed to be spaced at a predetermined interval D1 according to the print setting value stored in the controller 60.

In addition, the reference lines 21a and 121a may be printed in a continuous line shape so as to be parallel to each other at a predetermined interval D1 according to the print setting value stored in the controller 60, and the reference lines 21a and 121a may be printed. As it increases, the number may be increased by one. That is, n−1 reference lines may be formed during n repeated printings.

Therefore, the gravure printing apparatus according to the embodiment of the present invention as described above is the distance (D2) between the distance (D1) and the alignment marks (23a, 123a) between the reference lines (21a, 121a) detected by the sensing means (50). Comparing the print setting values stored in the control unit 60 to calculate the error in the print direction (MD) and the width direction (TD) of the print sheet 10, and by repeating the printing through the position correction of the gravure roll by the error, printing There is an effect that the pattern overlapping accuracy of the sheet can be improved.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limiting the scope of the present invention. I will understand.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the scope of the appended claims, as well as the appended claims.

10: print sheet 20, 120: gravure roll
21: reference line cells 21a, 121a: reference line
22: pattern cell 22a, 122a: pattern
23: alignment mark cell 23a, 123a: alignment mark
24, 124: doctor blade 25, 125: supply unit
30, 130: drive part 31: outer ring
32: inner ring 40, 140: support roll
50: detection means 60: control unit
70: guide roll 80: drying furnace

Claims (13)

Gravure rolls for printing patterns, alignment marks, and baselines on printing sheets;
A driving unit for supporting and rotating both ends of the gravure roll;
A support roll disposed to face the gravure roll via the printing sheet and supporting the printing sheet;
Sensing means formed on one side of the support roll to detect the alignment mark and the reference line; And
A control unit for controlling the gravure roll according to an error between the alignment mark and the reference line detected by the detection unit;
Gravure printing apparatus comprising a.
The method according to claim 1,
The reference line is a gravure printing apparatus is formed in a dummy region except for the region where the pattern is formed in a line shape.
The method according to claim 1,
The gravure printing apparatus is a gravure printing device in which a pattern cell, an alignment mark cell, and a baseline cell are formed in an intaglio form.
The method according to claim 1,
The alignment mark is a gravure printing device formed to be spaced apart a predetermined interval.
The method according to claim 1,
The reference line is a gravure printing apparatus is formed so as to be spaced apart at a predetermined interval in parallel.
The method according to claim 1,
The driving unit is a gravure printing device is formed of a non-contact bearing.
The method according to claim 1,
The driving unit is a gravure printing apparatus capable of moving the gravure roll in the vertical direction, left and right, front and rear, oblique direction.
The method of claim 6,
The non-contact bearing is a gravure printing device is one of an air static bearing or a magnetic bearing.
The method according to claim 1,
The driving unit gravure printing apparatus further comprises a displacement sensor for detecting the position of the gravure roll.
The method according to claim 1,
The control unit is a gravure printing device is a pre-stored print setting value is set the distance between the alignment mark and the distance between the reference line.
12. The method of claim 10,
And the control unit calculates an error by comparing the distance between the alignment marks and the reference line detected by the sensing unit with the printing setting value stored in the control unit, and moves the gravure roll through the driving unit by the error.
The method according to claim 1,
A guide roll for guiding a transfer path of the printing sheet; And
A drying furnace for drying the pattern printed on the printing sheet;
Gravure printing apparatus further comprising a.
The method according to claim 1,
A gravure printing apparatus further comprising a supply means for supplying a conductive paste or a dielectric paste to the gravure roll.

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