KR20240013479A - Roll-to-roll high speed digital printer with double black ink jetting unit of continuous color coating line(ccl) - Google Patents

Abstract

The present invention relates to a roll-to-roll high-speed digital printer with a double black ink jetting unit of a continuous color coating line (CCL) to remedy a nozzle that may be clogged in the high-speed digital printer applied to the CCL. The ink jetting unit comprises: a head part which has nozzles fixed in a heading direction of a coil wound to a reel to keep specific tension and injecting ink to enable an image to be printed on a surface of the coil; and an LED part which is located at a rear end of the head part in the heading direction of the coil, emits light to the jetted ink injected through the nozzles, and adjusts a degree of the ink's spreading. A plurality of the ink jetting units are arranged in the coil's heading direction. Cyan-colored, magenta-colored, and yellow and black inks are sequentially positioned in each ink jetting unit in the coil's heading direction. Black ink jetting units injecting a black ink are doubly formed, and the doubly formed black ink jetting units are applied at once.

Description

Roll-to-roll high-speed digital printer with double black ink jetting unit for continuous color coating line {ROLL-TO-ROLL HIGH SPEED DIGITAL PRINTER WITH DOUBLE BLACK INK JETTING UNIT OF CONTINUOUS COLOR COATING LINE (CCL)}

The present invention relates to a roll-to-roll high-speed digital printer using a double black ink jetting unit of a continuous color coating line to compensate for nozzles that are clogged in a high-speed digital printer applied to a continuous color coating line.

Colored steel sheets are widely used in building interior and exterior materials, roofing materials, home appliance exterior materials, and TV furniture exterior materials. Currently, color steel sheets used as exterior materials for household appliances or interior/exterior materials for buildings are mostly manufactured using the VCM (Vinyl Coated Metal) or PCM (Pre-Coated Metal) method. The VCM and PCM methods are used in environmental and economic aspects. It is at a disadvantage and has limitations in responding to the diverse needs of consumers.

To elaborate, the steel sheets used in existing IT-related finished products and electronic home appliance materials are mainly VCM color steel sheets, which are laminated with high-gloss PVC films with various patterns on raw materials (steel sheets). In the case of , there is a disadvantage that the price is somewhat expensive, from the original cost to the film on which the image is printed.

Accordingly, in order to reduce costs, the number of cases of replacing images with PCM color steel sheets, which are painted on regular steel sheets, is increasing. In the case of PCM color steel sheets applied with gravure printing rolls, as the image pattern becomes more complex and the number of colors increases, the number of printing cycles required to realize the image inevitably increases, so additional investment costs are inevitable, and in terms of product quality, it is compared to VCM products. Therefore, there are limits to meeting the quality requirements of high-end home appliances, such as high clarity and transparency.

In addition, in the case of the PCM method, the gravure printing roll used for a specific image cannot be changed later, so if a new image needs to be produced, the production cost will inevitably increase as additional printing is required accordingly, and the printing roll As the number of gravure printing rolls increases, the required ink must be individually injected into each gravure printing roll, so there is a problem that a lot of unnecessary time is spent in the preparation and cleanup process when applying a new image.

To solve this problem and manufacture color steel sheets with high gloss and sharpness, a high-speed inkjet printer was used, but a problem arose in which nozzles were clogged during the ink injection process, causing defects in the color steel sheets.

Korean Patent Publication No. 2370869

The present invention is a roll-to-roll high-speed printer using a double black ink jetting unit of a continuous color coating line to prevent defective printing due to ink not being ejected due to clogging of the nozzle that sprays ink in a digital printer applied to a continuous color coating line. It provides a digital printer.

More specifically, the present invention is equipped with a double black ink jetting unit that sprays black ink in order to minimize defects caused by clogging of the black ink nozzle, which is the most used, and adjusts the spreadability of the ink even if a small amount of ink is sprayed. It provides a roll-to-roll high-speed digital printer using a double black ink jetting unit with a continuous color coating line that eliminates gaps in non-jetted areas.

In addition, the present invention is a roll-to-roll high-speed digital printer equipped with a double black ink jetting unit of a continuous color coating line that determines defective printing areas caused by nozzle clogging in real time and minimizes the time required to solve the nozzle clogging problem. It is provided.

The technical problems to be achieved by the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the description below. You will be able to.

A roll-to-roll high-speed digital printer applying the double black ink jetting unit of the continuous color coating line of the present invention to achieve the above problem is a high-speed digital printer in the continuous color coating line, which has a coil wound on a reel and maintaining a constant tension. A head unit fixed in the traveling direction and provided with nozzles that spray ink to print an image on the surface of the coil; and an LED unit located at the rear end of the head in the direction of movement of the coil and controlling the spreadability of the ink by irradiating light to the jetted ink sprayed through the nozzles. An ink jetting unit formed of a coil is formed. A plurality of inks are arranged in the direction of progress of the coil, and cyan series, magenta series, yellow, and black ink are placed in the order of each ink jetting unit in the direction of movement of the coil, and the black ( The black ink jetting unit that sprays black ink is configured as a double, and the black ink jetting unit configured as a double is applied simultaneously.

Specifically, the head portion is maintained at a constant distance in the width direction of the coil, and a first headline formed of a plurality of heads; And, the head portion is spaced apart from the first headline at a certain distance in the longitudinal direction of the coil and maintained at a certain distance in the width direction of the coil. It is characterized in that it is composed of a second headline formed of a plurality of heads.

In addition, each head forming the first headline and the second headline is arranged in a zigzag shape.

In addition, the LED unit is characterized in that the power is variable to control the spreadability of the ink.

In addition, it is characterized in that it further includes a print quality monitoring unit for checking and controlling the print quality status at the rear end of the black ink jetting unit formed in the moving direction of the coil.

In addition, the print quality monitoring unit includes a vision unit for photographing the printed state of the printed image; a determination unit that determines whether printing is missing by comparing the printed image captured by the vision unit with preset reference print image data; And a control unit that adjusts the spreadability of the ink depending on whether the printing is sewn.

In addition, when the determination unit determines whether the printing is missing, the control unit adjusts the power of the LED unit to increase the spreadability of the ink.

In addition, when the determination unit determines whether the printing is missing, the control unit extracts the missing color information to adjust the spreadability of the ink for each color and individually adjusts the power of the LED unit of the ink jetting unit provided for each color. It is characterized by control.

In addition, when the determination unit determines whether printing is missing, the control unit transmits a nozzle sewing machine blockage notification message to a preset terminal.

In addition, the double black ink jetting unit is characterized by dividing the amount of black ink into separate jets.

As explained above,

The present invention has the effect of preventing defective printing due to ink not being ejected due to clogging of the nozzle that ejects ink in a digital printer applied to a continuous color coating line.

More specifically, the present invention is equipped with a double black ink jetting unit that sprays black ink to minimize defects caused by clogging of the black ink nozzle, which is the most used, and adjusts the spreadability of the ink to eliminate gaps caused by clogging. It works.

In addition, the present invention has the effect of minimizing the time required to solve the nozzle clogging problem by determining in real time the defective printing area caused by the nozzle clogging.

Figure 1 is a process diagram showing a continuous color coating line process including a roll-to-roll high-speed digital printer according to an embodiment of the present invention.
Figure 2 is a diagram showing a roll-to-roll high-speed digital printer according to an embodiment of the present invention.
Figure 3 is a diagram showing the arrangement of the ink jetting unit of a roll-to-roll high-speed digital printer according to an embodiment of the present invention.
Figure 4 is a graph showing the amount of light according to the power of the LED unit of the roll-to-roll high-speed digital printer according to an embodiment of the present invention.
Figure 5 is a diagram showing the difference in ink spreadability according to the power of the LED part of the roll-to-roll high-speed digital printer according to an embodiment of the present invention.
Figure 6 is a diagram showing spray application of black ink jetting units of a roll-to-roll high-speed digital printer according to an embodiment of the present invention.
Figure 7 is a block diagram showing a print quality monitoring unit of a roll-to-roll high-speed digital printer according to an embodiment of the present invention.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the attached drawings.

In addition, the size or shape of the components shown in the drawings may be exaggerated for clarity and convenience of explanation, and terms specifically defined in consideration of the configuration and operation of the present invention may vary depending on the intention or custom of the user or operator. and definitions of these terms should be made based on the content throughout this specification.

Figure 1 is a process diagram showing a continuous color coating line process including a roll-to-roll high-speed digital printer according to an embodiment of the present invention. The continuous color coating line is a steel strip in the coil (1) state. In order to continuously supply to the line through a plurality of pay-off reels (10, 20), when the coil (1) in the first pay-off reel (10) is completely unwound, it is transferred to the second pay-off reel (20). It passes through a joiner that connects the waiting coil by pressing it with a press, and stores it in the first looper (40) while the coil (1) is connected to the joiner (30).

Afterwards, the coil (1) goes through pretreatment (50), which is a pretreatment process to ensure good ink or paint adhesion, and the oil on the coil (1) is removed with an alkaline degreasing solution, washed with water, and the material and paint are removed. For attachment, the base paint is applied at the base coater 70 after passing through the primer & chemical coater 60, which coats the chemical in a thin film, the painted paint is dried in the base oven 80, and the first cooler ( 90) Spray water on the coil to cool it.

Thereafter, ink or paint is sprayed onto the surface of the coil on which the paint is dried in the roll-to-roll high-speed digital printer 100 according to an embodiment of the present invention to print a color pattern.

After passing through the roll-to-roll high-speed digital printer 100, the clear paint is applied in the finish coater 110, the painted clear paint is dried in the finish oven 120, and the heated coil is cooled in the second cooler 130.

The painted coil is wound on the tension reel 150, and the painted coil is stored in a second looper so that the tension of the coil can be maintained while the coil wound on the tension reel 150 is pulled out. It consists of tension rolls 160 that maintain the tension of the coil between each section.

In a continuous color coating line configured in this way, a high-speed digital printer sprays ink or paint on the coil to print a color pattern.

Figure 2 is a diagram showing a roll-to-roll high-speed digital printer according to an embodiment of the present invention. The roll-to-roll high-speed digital printer 100 largely consists of an ink jetting unit 200 and a print quality monitoring unit 300.

The ink jetting unit 200 is composed of a head unit 210 and an LED unit 220. The head unit 210 is wound on a reel and is fixed in the direction of progress of the coil 1 that maintains a certain tension to maintain a constant tension of the coil 1. It is provided with nozzles 211 that spray ink so that an image is printed on the surface. Here, the ink is UV ink.

In addition, it is preferable that it is not sprayed directly on the surface of the coil, but rather is sprayed onto the upper surface of the sprayed adherend layer while passing through a continuous color coating line.

Here, the head portion 210 is composed of a first headline 210a and a second headline 210b, and the first headline 210a is maintained at a certain distance in the width W direction of the coil 1. It is formed of a plurality of heads 21, and the second headline 210b is spaced apart from the first headline 210a at a certain distance in the length L direction of the coil 1 to increase the width W of the coil 1. It is formed of a plurality of heads 21 while maintaining regular intervals in each direction.

That is, the head portion 210 in the embodiment of the present invention has two rows of headlines in the longitudinal direction of the coil 1 or the moving direction of the coil 1, and has a width of the coil in the width direction of the coil 1. It is formed of multiple lines that can encompass.

At this time, as shown in FIG. 3A, the head unit 210 has each head 21 forming the first headline 210a and the second headline 210b arranged in a zigzag shape, or as shown in FIG. 3B. As described above, each head 21 forming the first headline 210a and the second headline 210b may be arranged in a straight line in the width W direction of the coil.

Here, the reason for configuring the head portion 210 with a plurality of headlines is that color printing having a first resolution can be performed with one headline, while color printing with a first resolution can be performed with two headlines. You can print at 2 resolution.

In other words, it has the effect of improving the quality of color printing by increasing the printing resolution.

In addition, the LED unit 220 is located at the rear of the head unit 210 in the direction of movement of the coil 1 and irradiates light to the ink jetted through the nozzles 211 to control the spreadability of the ink. It is preferable to provide a plurality of LEDs so as to encompass the head portion 210 formed as long as the width of the coil, and it is preferable to provide a plurality of LEDs at the rear of each head portion 210 provided for each color.

That is, an LED unit 220 is provided for each color. By providing an LED unit 220 for each color, the ink sprayed does not spread before ink of another color is sprayed. This can prevent colors from mixing.

Here, the UV ink is not cured through the LED unit 220, but the LED unit 220 only controls the spreadability of the ink, and the curing of the UV ink is performed using a UV lamp (not shown) located in another part of the continuous color coating line. Hardening is achieved by

The power of the LED unit 220 is variable to control the spreadability of the ink, and the power can be adjusted from 10% to 100%.

Here, as shown in FIG. 4, looking at a graph showing the amount of light according to the power of the LED unit 220 used in the embodiment of the present invention, the power of the LED unit 220 used in the embodiment of the present invention and Although the amount of light is proportional, it is not directly proportional, so there is a difference in the spreadability of the ink depending on the relative performance of the LED unit 220 and the degree of light amount, so there is no numerical limitation.

However, in an embodiment of the present invention, when the power of the LED unit 220 is 10%, the light quantity is about 8 mJ/cm ² , and when the power is 20%, the light quantity is about 16 mJ/cm ² , and the power of the LED unit 220 is When it changes by 10%, it changes by about 4 to 8 mJ/cm ² , so adjusting the power of the LED unit 220 for the spreadability of the ink may be the same as adjusting the amount of light irradiated.

That is, in order to adjust the spreadability of the ink, it may be adjusted based on the amount of light radiated rather than the power of the LED unit 220. In the embodiment of the present invention, the LED unit 220 is adjusted according to the degree of blockage of the nozzle. You can fill the sewing machine space by adjusting the power or light amount.

In other words, as shown in FIG. 5, the spreadability of ink varies depending on the power of the LED unit 220.

That is, as shown in FIG. 5A, the closer the power of the LED unit 220 is to 100%, the closer the ink is to its original shape when dropped on the adherend (white paint). However, as shown in FIG. 5B, the power of the LED unit 220 decreases. The closer it is to 10%, the more the ink spreads when dropped on the adherend (white paint).

Through this information, when the nozzle 211 is clogged, the power of the LED unit 220 can be adjusted to improve the spreadability of the ink, so that the ink can be distributed widely, thereby widening the jetting area of the ink and reducing the number of sewing machines. It works.

More specifically, the sewing machine nozzle phenomenon appears as if the nozzle is clogged and ink is not ejected, but in reality, the nozzle is not completely clogged, and in most cases, some of the ink falls through the gap inside the nozzle.

Accordingly, the present invention determines whether the nozzle is in the sewing nozzle state, and if the nozzle is in the sewing nozzle state, the relatively low power of the LED unit 220 is irradiated to improve the spreadability of the ink spreading laterally.

This improved spreadability has the advantage of being able to print on a relatively large area with a small amount of ink.

A plurality of ink jetting units 200 are arranged in the direction of movement of the coil 1, and in the direction of movement of the coil, each ink jetting unit 200 has colors such as cyan series, magenta series, yellow, and black ink, but the black ink jetting unit 200B that sprays black ink is configured as a double, and the double black ink jetting unit 200B is applied simultaneously.

At this time, the double black ink jetting unit (200B) sprays the black ink separately.

For example, as shown in FIG. 6, the double black ink jetting unit 200B sprays half of the amount to be sprayed while passing through the first black ink jetting unit 200B1, and then sprays the second black ink jetting unit 200B1. Passing through (200B2), the remaining half of the amount to be sprayed is sprayed.

This is provided with one black ink jetting unit (200B), so if the black ink jetting unit (200B) is clogged, the printing sewing machine occurs, but by providing a double black ink jetting unit (200B), one black ink jetting unit (200B) Even if the nozzle of the black ink jetting unit (200B) is blocked, the remaining black ink jetting unit (200B) sprays black ink and controls the spreadability, which has the effect of blocking the printing sewing machine.

The print quality monitoring unit 300 is configured to check and control the print quality status at the rear end of the last black ink jetting unit formed in the direction of the coil. As shown in FIG. 7, the print quality monitoring unit 300 is It includes a vision unit 310, a determination unit 320, and a control unit 330.

Here, the vision unit 310 obtains a printing image by photographing the printed state of the image printed on the surface of the adherend.

The determination unit 320 determines whether the printing is missing by comparing the printed image captured by the vision unit 310 with preset reference print image data.

The control unit 330 can adjust the spreadability of the ink depending on whether or not the printing is sewn as determined by the determination unit 320, and controls the wave power of the LED unit 220 to increase the spreadability of the ink.

Additionally, the control unit 330 can extract the sewn color information to control the spreadability of ink for each color and individually adjust the power of the LED unit 220 of the ink jetting unit 200 for each color.

In addition, when a printing sewing problem occurs, the control unit 330 transmits a nozzle sewing machine blockage notification message to the preset terminal 400 so that the operator can quickly determine whether the printing sewing machine is blocked, thereby quickly solving the nozzle blockage problem. Make sure it can be resolved within time.

At this time, wireless communication may be performed to transmit information to the preset terminal 400, or it may be a terminal connected by wire, but detailed description of the configuration related to wireless or wired communication will be omitted.

Therefore, the present invention has the effect of preventing defective printing due to ink not being ejected due to clogging of the nozzle that ejects ink in a digital printer applied to a continuous color coating line.

More specifically, the present invention is equipped with a double black ink jetting unit that sprays black ink to minimize defects caused by clogging of the black ink nozzle, which is the most used, and adjusts the spreadability of the ink to eliminate gaps caused by clogging. It works.

In addition, the present invention has the effect of minimizing the time required to solve the nozzle clogging problem by determining in real time the defective printing area caused by the nozzle clogging.

Although embodiments according to the present invention have been described above, they are merely illustrative, and those skilled in the art will understand that various modifications and equivalent scope of embodiments are possible therefrom.

Therefore, the true technical protection scope of the present invention should be determined by the following patent claims.

1...coil
10...1st payoff reel
20...2nd payoff reel
30...joiner
40...1st looper
50...Pre-treatment
60...Primer&chem coater
70...base coater
80...base oven
90...1st cooler (cooler)
100...roll-to-roll high-speed digital printer
110...finish coater
120...finish oven
130...Second cooler (cooler)
140...second looper
150...tension reel
160...tension roll
200...ink jetting unit
210...head part
21...Head
210a...First headline
210b...second headline
211...nozzle
220...LED part
300...print quality monitoring unit
310...Vision Department
320...Judgment Department
330...Control unit
400...Terminal
200B1...1st black ink jetting unit
200B2...2nd black ink jetting unit

Claims (10)

In a high-speed digital printer on a continuous color coating line,
A head unit fixed in the direction of movement of a coil wound on a reel and maintaining a certain tension, and provided with nozzles that spray ink to print an image on the surface of the coil; And an LED unit located at the rear end of the head unit in the direction of movement of the coil and controlling the spreadability of the ink by irradiating light to the ink sprayed through the nozzles and jetted, thereby forming an ink jetting unit formed of,
A plurality of ink jetting units are arranged in the direction of movement of the coil, and cyan series, magenta series, yellow, and black ink are applied to each ink jetting unit in that order in the direction of movement of the coil. Position it,
A double black ink jetting unit of a continuous color coating line is applied, characterized in that the black ink jetting unit that sprays the black ink is configured as a double, and the black ink jetting unit configured as a double is applied simultaneously. Roll-to-roll high-speed digital printer.
In claim 1,
The head portion is a first headline formed of a plurality of heads while maintaining a certain distance in the width direction of the coil; And
Double black ink jetting of a continuous color coating line, characterized in that it consists of a second headline formed of a plurality of heads while being spaced at a certain distance from the first headline in the longitudinal direction of the coil and maintained at a certain distance in the width direction of the coil. A roll-to-roll high-speed digital printer using a unit.
In claim 2,
A roll-to-roll high-speed digital printer applying a double black ink jetting unit of a continuous color coating line, characterized in that each head forming the first headline and the second headline is arranged in a zigzag shape.
In claim 1,
The LED unit is a roll-to-roll high-speed digital printer applying a double black ink jetting unit of a continuous color coating line, characterized in that the power is variable to control the spreadability of the ink.
In claim 1,
A high-speed roll-to-roll application using a double black ink jetting unit of a continuous color coating line, further comprising a print quality monitoring unit for checking and controlling the print quality status at the rear end of the black ink jetting unit formed in the moving direction of the coil. Digital printer.
In claim 5,
The print quality monitoring unit includes a vision unit for photographing a printed state of a printed image;
a determination unit that determines whether printing is missing by comparing the printed image captured by the vision unit with preset reference print image data; and
A roll-to-roll high-speed digital printer applying a double black ink jetting unit of a continuous color coating line, comprising a control unit that adjusts the spreadability of the ink depending on whether the printing is sewn.
In claim 6,
When the determination unit determines whether the printing is missing, the control unit adjusts and controls the power of the LED unit to increase the spreadability of the ink. A high-speed roll-to-roll application using a double black ink jetting unit of a continuous color coating line. Digital printer.
In claim 6,
When the determination unit determines whether the printing is missing, the control unit extracts the missing color information to adjust the spreadability of the ink for each color and individually adjusts and controls the power of the LED unit of the ink jetting unit provided for each color. A roll-to-roll high-speed digital printer equipped with a double black ink jetting unit on a continuous color coating line.
In claim 6,
When the determination unit determines whether printing is missing, the control unit transmits a nozzle sewing machine blockage notification message to a preset terminal. A roll-to-roll high-speed digital printer using a double black ink jetting unit of a continuous color coating line.
In claim 1,
The black ink jetting unit, which consists of doubles, is a roll-to-roll high-speed digital printer using a double black ink jetting unit of a continuous color coating line, characterized in that the black ink jetting amount is divided into two jets.