KR20130060753A - Gravure printing apparatus - Google Patents

Abstract

PURPOSE: A gravure printer is provided to sense defects of a printing sheet moving at a high speed in advance and to print on the printing sheet except the defective portion without stopping the printer when detecting the defects, thereby improving productivity. CONSTITUTION: A gravure printer comprises a plurality of supporting rolls(10), an impression cylinder roll(20), a detect sensing member(30), and a gravure unit(40). The supporting rolls support a printing sheet(S) moving at a high speed. The impression cylinder roll is formed between the supporting rolls, thereby pressurizing the printing sheet downwardly. The defect sensing member senses defects of the printing sheet before the printing sheet is transferred to the impression cylinder roll. The gravure unit is arranged to be faced with the impression cylinder roll by a medium of the printing sheet and moved according to signals transmitted by the defect sensing member, thereby printing electrode patterns on the printing sheet except to the defective portion.

Description

Gravure printing device {GRAVURE PRINTING APPARATUS}

The present invention relates to a gravure printing apparatus, and more particularly, since the gravure roll is separated and brought into contact with the pressing roll according to the presence or absence of a defect on the printing sheet, only the defective portion is unprinted without changing the tension of the printing sheet, resulting in a poor printing section. The present invention relates to a gravure printing apparatus capable of improving reliability.

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 manufacturing a multilayer ceramic electronic component such as a multi-layer ceramic capacitor (MLCC), the internal electrode is formed by a screen printing method. Such screen printing is easy to form a pattern, and is suitable for roll-to-roll process and is applied to mass production.

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 with the screen printing method of the roll, the feed rate of the roll 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 uniformity of the entire printing surface but also 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, since the thin printed layer is formed at a high speed, when the print sheet has a defect, the defect is detected and the defective portion should not be printed so that quality defects do not occur.

In the conventional screen printing method, when a foreign material defect or a pinhole defect is found in the printing sheet by the camera device in the printing process, the operation of the printing squeegee is stopped, and only the defective sheet is transferred, thereby passing the defective portion without printing.

In the screen printing method, since printing is discontinuously performed while the printing sheet is stopped, there is no problem in a low speed printing apparatus. The problem with the device is that it is virtually impossible to stop working every time a defect is found.

In order to solve this problem, it detects a defect of the printing sheet and when it finds a defect, it is in close contact with the gravure roll to apply the pressing force to the pressing roll to pass through the defect parts, and again close to the gravure roll to apply a pressing force In the above configuration, as the pressing roll moves up and down to press the moving printing sheet, the movement path of the printing sheet is changed to cause a change in the instantaneous tension of the printing sheet. At this time, as the tension of the printing sheet is changed, a time loss until returning to the normal printing state occurs, and a problem in which the portion of the defective portion that is not printed afterwards and the print quality are degraded.

KR 10-2010-0110113 A

The present invention proposed to solve the above problems is to detect the defect of the printing sheet in advance in the high speed printing apparatus to be continuously printed in advance, the gravure printing apparatus that can proceed printing except for the defective portion without stopping the device The purpose is to provide.

Another object of the present invention is to provide a gravure printing apparatus capable of performing printing except for a defective portion 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 the pressing roll and the gravure roll without any additional device.

Gravure printing apparatus according to an embodiment of the present invention for achieving the above object is a plurality of support rolls for supporting a high-speed moving printing sheet, the pressure roll is formed between the support rolls and presses the printing sheet downward; Defect detection means for detecting a defect of the printing sheet and the printing sheet is arranged opposite to the pressing roll via the printing sheet before moving to the pressing roll, flows in accordance with the signal transmitted from the defect detecting means to the defective portion in the printing sheet Excluding the gravure portion for printing the electrode pattern.

The gravure unit may include a gravure roll that rotates and prints a conductive paste on a printing sheet, and a driving unit that is formed at both ends of the gravure roll to support a central axis and to raise and lower the gravure roll.

In this case, the gravure roll may be formed in the electrode pattern intaglio so that the conductive paste is applied to the outer peripheral surface.

In addition, the driving unit may be formed as a non-contact bearing.

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

On the other hand, the drive unit includes a displacement sensor for measuring the position of the center axis of the gravure roll and a control unit for controlling the gravure roll in accordance with the position of the center axis of the gravure roll measured by the displacement sensor and the signal transmitted from the defect detecting means. Can be.

The driving unit may further include a pressure sensor measuring the pressure at which the gravure roll presses the pressure roll.

And the gravure roll and the pressure roll can be rotated at the same speed.

In addition, the defect detecting means may include a light source for irradiating light and a camera for photographing the printing sheet.

Here, the camera may further include a signal transmission unit for transmitting a signal by calculating the time that the defective portion on the printing sheet to the pressing roll and the gravure unit.

The gravure printing apparatus according to the embodiment of the present invention for achieving the above object can detect the defect in advance in the printing sheet moving at a high speed, and can proceed printing except the corresponding defect portion without stopping the device when detecting the defect. There is an effect that the productivity is improved.

In addition, since the gravure roll moves up and down and is spaced apart from the pressing roll, there is no change in the movement path of the printing sheet, so there is no change in tension, so that it takes no time to return to the normal printing state, and the unprinted portion and print quality are inferior. Minimizing the part has the effect of reducing the production cost.

In addition, the gravure roll is moved up and down through the non-contact bearing, so that the pressure roll and the gravure roll can be separated without any additional device, there is an effect that can reduce the equipment manufacturing cost and maintenance cost.

1 is a side view schematically showing a gravure printing apparatus according to an embodiment of the present invention.
Figure 2 is a partial perspective view schematically showing a gravure printing apparatus according to an embodiment of the present invention.
3 and 4 are front views schematically showing a gravure printing apparatus according to an embodiment of the present invention.
5 is a cross-sectional view schematically showing a gravure portion.
Figure 6 is a side cross-sectional view showing a gravure portion.
7 is a block diagram showing an internal configuration of a drive unit.

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 based on the contents throughout this specification.

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 7.

1 is a side view schematically showing a gravure printing apparatus according to an embodiment of the present invention, Figure 2 is a partial perspective view schematically showing a gravure printing apparatus according to an embodiment of the present invention, Figures 3 and 4 of the present invention It is a front view schematically showing the gravure printing apparatus according to the embodiment.

As shown in Figures 1 to 4, the gravure printing apparatus according to an embodiment of the present invention is formed between a plurality of support rolls 10 for supporting the printing sheet (S) moving at high speed, and the support roll 10 And a pressing roll 20 for pressing the printing sheet S downward, defect detecting means 30 for detecting a defect of the printing sheet S before moving to the pressing roll 20, and the printing sheet S. It is disposed to face the pressing roll 20 via a), flows according to the signal transmitted from the defect detecting means 30 to print the electrode pattern (P) except for the defective portion on the printing sheet (S) It includes a gravure portion 40.

The support roll 10 may be formed in plural to support the lower portion of the printing sheet S as a cylindrical roll member supporting the printing sheet S moving at a high speed to guide the moving direction.

Here, the printing sheet (S) is a ceramic green sheet, preferably a ceramic green sheet placed by a carrier film.

The pressure roll 20 is formed between the support roll 10, it may be formed to press down the printing sheet (S). At this time, the pressure roll 20 is connected to the piston of the cylinder by pressing the printing sheet (S) to the lower through the vertical movement of the piston to maintain a constant contact pressure applied in the changed state, printing, The tension of the sheet S is linearly contacted and pressed by the gravure part 40 in a constant state, thereby printing the electrode pattern P. FIG.

At this time, the pressure roll 20 is formed in the same width as the width of the printing sheet (S), or may be formed in a wider width to press the entire area of the printing sheet (S).

The defect detecting means 30 is to detect a defect of the printing sheet (S) before moving to the pressure roll (20). Here, the defect detecting means 30 may be spaced apart from the pressing roll 20 by a predetermined distance, and may be provided at the front side opposite to the moving direction of the printing sheet S. FIG. That is, by first detecting the defect of the printing sheet (S) and then printing, the printing process may be continuously performed in accordance with the printing sheet (S) moving at a high speed.

Here, the defect detecting means 30 may be composed of a light source 31 for irradiating light and a camera 32 for photographing the printing sheet (S) moving at a high speed.

At this time, the light source 31 is formed on the upper portion of the printing sheet (S) to irradiate light in the lower direction, the light transmitted through the printing sheet (S) by the camera 32 formed in the lower portion of the printing sheet (S) Will be received. Here, when the illuminance of the light passing through the printing sheet S changes due to a foreign material defect or pinhole defect on the printing sheet S, the camera 32 determines that the printing sheet S is defective and signals a signal. Will occur.

On the other hand, a predetermined time difference occurs until the defective portion of the printing sheet S detected by the camera 32 reaches the pressing roll 20. At this time, since the signal transmitter 33 connected to the camera 32 calculates the time at which the defective part arrives at the pressure roll 20 and transmits a signal generated by the camera 32, the detected defective part is the pressure roll. The time difference until reaching (20) can be eliminated.

In the preferred embodiment according to the present invention has been described as consisting of the light source 32 and the camera 31 as the defect monitoring means 30, but is not limited to this, it can also be detected by a laser or ultrasonic device.

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

As shown in FIGS. 5 to 7, the gravure part 40 is disposed at the lower side of the printing sheet S to face the pressing roll 20, and is provided with a gravure roll 41 and a gravure roll 41. It may be configured as a driving unit 42 for raising and lowering.

Here, the gravure roll 41 is a cylindrical roll member for printing the electrode pattern (P) on the printing sheet (S) which is a high-speed moving printing sheet (S) by applying a conductive paste on the outer circumferential surface is the same or wider than the width of the pressure roll (20) Can be formed.

At this time, the outer circumferential surface of the gravure roll 41 is indented electrode pattern (P) is formed to apply a conductive paste, the remaining conductive paste after filling the electrode pattern (P) is in contact with the surface of the gravure roll (41) And may be removed by a doctor blade 50 formed on one side.

In this case, the conductive paste applied to the gravure roll 41 may be applied to the gravure roll 41 through a supply device (not shown). It is also possible that the gravure roll 41 is formed in the lower portion is immersed into the reservoir.

That is, the gravure roll 41 is provided to face the pressure roll 20 with the printing sheet S therebetween, and the gravure roll 41 is applied to the pressure roll 20 by the pressing force applied to the pressure roll 20. The electrode pattern P may be printed on the surface of the printing sheet S moving between the Libyan roll 41 and the pressure roll 20.

Here, the gravure roll 41 is preferably rotated at the same speed as the pressure roll (20) disposed opposite to each other via the printing sheet (S).

On the other hand, the driving unit 42 may be formed as a non-contact bearing by supporting the both ends of the gravure roll 41, by rotating and lifting up to print the electrode pattern (P) on the printing sheet (S).

At this time, the drive unit 42 is composed of the inner ring 43 and the outer ring 44, as shown in Figure 6a, the central axis of the gravure roll 41 is inserted into the inner ring 43, the outer ring 44 It is spaced apart and placed in the center. Here, when the defect is detected, the inner ring 43 is lowered as shown in FIG. 6B when the defect is detected, and the inner ring 43 is raised as shown in FIG. 7C when there is no defect.

In addition, 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 coupled to the central axis of the gravure roll 41 and transmits the measured position to the controller 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 transmitting unit 33 of the defect detecting means 30. By lowering, the central axis of the gravure roll 41 coupled to the inner ring 43 is raised or lowered to print the electrode pattern P on the printing sheet (S).

That is, the driving 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 controller 46 so that the inner ring 43 is the outer ring 44. By predetermined flow up and down in the inner side, the gravure roll 41 coupled to the inner ring 43 is predetermined flow up and down to the printing sheet (S) to move between the pressure roll 20 and the gravure roll 41 Since the electrode pattern (P) is printed, precise control of the gravure roll 41 is possible, and since only the minimum defects are excluded, there is an advantage of reducing the manufacturing cost.

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

In addition, the driving unit 42 is formed with a pressure sensor 47 for measuring the pressure of the gravure roll 41 to press the pressure roll 20, the gravure roll 41 is the excessive pressure on the pressure roll 20 Since the pressing force is controlled by controlling the position of the inner ring 43 during pressurization, it is possible to prevent damage to the printing sheet S or the printing apparatus.

That is, the printing sheet S continuously supplied is inspected by the defect detecting means 30 to transmit a signal to the control unit 46 of the driving unit 42 through the signal transmitting unit 33 when the defect is detected. According to the reaching time, the inner ring 43 coupled with the central axis of the gravure roll 41 descends to separate the pressure roll 20 and the gravure roll 41, and the electrode pattern P is printed on the defective portion. To pass through unattended. Thereafter, after the defective portion passes, the gravure roll 41 again rises and comes into contact with the press roll 20, so that even if there is a defective portion, the printing process proceeds continuously without stopping the printing process, thereby improving productivity. have.

Therefore, the printing sheet moving at a high speed can detect defects in advance, and printing can be performed except for the defective portion without stopping the device when detecting defects, so there is no tension variation, so that it takes no time to return to the normal printing state. The productivity is improved by minimizing the non-printing part and the part with poor print quality, and it is possible to separate the press roll and gravure roll without any additional device such as a cylinder. There is a saving effect.

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: support roll 20: pressure roll
30: defect detection means 31: light source
32: camera 33: signal transmitter
40: gravure part 41: gravure roll
42: drive portion 43: inner ring
44: outer ring 45: displacement sensor
46: control unit 47: pressure sensor
50: doctor blade P: electrode pattern
S: Print Sheet

Claims (10)

A plurality of support rolls for supporting the high speed moving printing sheet;
A pressure roll formed between the support rolls to press the printing sheet downward;
Defect detecting means for detecting a defect of a printing sheet before moving to the pressing roll; And
A gravure unit disposed to face the pressing roll via the printing sheet and flowing in accordance with a signal transmitted from the defect detecting unit to print an electrode pattern on the printing sheet except for a defective portion;
Gravure printing apparatus comprising a.
The method according to claim 1,
The gravure unit
A gravure roll rotating and printing a conductive paste on a printing sheet; And
A driving unit formed at both ends of the gravure roll to support a central axis and to raise and lower the gravure roll;
Gravure printing apparatus comprising a.
The method according to claim 2,
The gravure printing apparatus is a gravure printing device in which the electrode pattern is formed in an intaglio so that a conductive paste is applied to the outer circumferential surface.
The method according to claim 2,
The driving unit is a gravure printing device is formed of a non-contact bearing.
The method according to claim 4,
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 2,
The driving unit
A displacement sensor measuring a central axis position of the gravure roll; And
And a control unit controlling the gravure roll according to the position of the center axis of the gravure roll measured by the displacement sensor and the signal transmitted from the defect detecting means.
The method according to claim 2,
The driving unit
The gravure printing apparatus further comprises a pressure sensor for measuring the pressure to press the gravure roll pressure roller.
The method according to claim 2,
The gravure printing apparatus and the gravure roll is rotated at the same speed.
The method according to claim 1,
The defect detecting means includes a light source for irradiating light and a camera for photographing the printing sheet.
The method of claim 9,
And the camera further comprises a signal transmission unit for transmitting a signal by calculating a time at which the defective portion on the printing sheet arrives at the pressure roll and the gravure unit.

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