KR20220115282A - Printer for steel plate - Google Patents

Abstract

According to the present invention, a steel plate printing device comprises: an ink injection unit injecting ink to a steel plate; a drying unit drying and solidifying the ink injected on the steel plate; and a tension generation unit disposed on a transfer route of the steel plate and having a back roll where the steel plate is closely attached to constantly maintain a spaced distance of the steel plate from the ink injection unit. The ink injection unit and the drying unit are arranged along a circumference of the back roll.

Description

Steel plate printing device {PRINTER FOR STEEL PLATE}

The present invention relates to a steel plate printing apparatus for printing a steel plate using inkjet printing.

In general, in order to print a steel sheet in color, as an example, a method of continuously printing using an inkjet while unwinding a coil-shaped steel sheet and continuously proceeding may be utilized.

However, in the process of printing the steel sheet using the inkjet as described above, the steel sheet is sometimes transferred in a raised or curved shape. Due to this, as the distance between the steel sheet and the inkjet head is not kept constant, the print quality is deteriorated and the inkjet head There is a problem in that the risk of breakage increases.

Republic of Korea Patent Publication No. 10-0926517

The present invention was devised to solve the above problems, and an object of the present invention is to provide a steel plate printing apparatus that prints while maintaining a constant distance between the inkjet and the steel plate.

In order to achieve the above object, a steel plate printing apparatus according to the present invention includes: an ink ejecting unit for ejecting ink to a steel plate; a drying unit for drying and curing the ink sprayed on the steel sheet; and a tension generating unit disposed on the transfer route of the steel plate, the tension generating unit having a back roll to which the steel plate is in close contact so as to maintain a constant separation distance of the steel plate with respect to the ink ejecting unit, the ink ejecting unit and the drying unit is disposed along the perimeter of the back roll.

Here, the tension generating unit may include: a front deflector roll and a rear deflector roll arranged to be spaced apart from each other in the conveying route of the steel sheet, and for changing the conveying direction of the steel sheet; and the back roll for switching the conveying direction of the steel sheet moving between the front deflector roll and the rear deflector roll so that the steel sheet is in close contact with the steel sheet by generating tension in the steel sheet; And it can take a structure in which tension is generated by sequentially winding the rear deflector roll.

At this time, the ink jetting unit includes a plurality of inkjet heads, the plurality of inkjet heads are spaced apart from each other along the circumference of the back roll, and the drying unit includes a plurality of drying devices for drying and curing the ink with hot air. , The dryer may be disposed between a plurality of inkjet heads, respectively, and the plurality of inkjet heads and the plurality of dryers may be disposed in an arc-shaped structure corresponding to the back roll.

On the other hand, the present invention further includes an exhaust unit configured to block the flow of the hot air from the drying machine to the printing section where the steel sheet is printed by the inkjet head, wherein the exhaust unit includes a plurality of exhaust units for discharging the hot air. A device may be provided, and the exhaust device may be disposed at front and rear sides of each of the plurality of inkjet heads.

And, as an embodiment, the front deflector roll and the rear deflector roll may rotate in the same direction, and the back roll may have a structure in which the front deflector roll and the rear deflector roll rotate in opposite directions.

As another embodiment, the rear deflector roll and the back roll rotate in the opposite direction to the front deflector roll, and as the steel plate advances, the non-printing surface of the steel plate is in contact with the rear deflector roll to form a winding structure.

On the other hand, the present invention further includes a cleaning unit configured to remove contaminants including ink on the surface of the back roll with a cleaning solution, wherein the cleaning unit is in contact with the back roll and rotates interlockingly according to the rotation of the back roll cleaning rolls; and a cleaning container disposed below the cleaning roll, in which a cleaning solution for removing contaminants transferred from the back roll to the cleaning roll is accommodated.

And, the present invention further includes; a preheater for preheating the steel sheet before the ink is ejected by the ink ejection unit, which is disposed at a position before the steel plate advances to the ink ejection unit in the transport route of the steel plate. can

In addition to this, the present invention is a post-heat heater for completely drying the ink sprayed on the steel plate after the steel plate has passed the ink ejection unit in the transport route of the steel plate and is disposed at a position after the ink ejection unit completes the ink ejection. ; may be further included.

In addition, the ink ejected from the ink ejection unit may include a solvent having a chemical composition of water-soluble or volatile so as to dry and harden.

The steel plate printing apparatus according to the present invention comprises a tension generating unit that generates tension on the steel plate in the course of the steel plate progressing, and the ink jetting unit is disposed along the circumference of the back roll of the tension generating unit, thereby preventing the steel plate from bending or lifting. As the steel sheet is closely adhered to the back roll by preventing it, the separation distance of the steel sheet with respect to the ink jetting unit is maintained constant, thereby having the effect of improving the printing quality of the steel sheet.

In addition, the present invention provides an exhaust unit on each of the front and back sides of the inkjet head so that the hot air ejected from the drying unit, the preheater, and the postheater does not affect the ink ejected from the inkjet head, so that the hot air is exhausted from the exhaust unit. As it is discharged out of the printing section through the

In addition, the present invention has an advantage in that the printing quality of the steel sheet can be further improved by uniformly cohesiveness of the ink sprayed on the steel sheet by configuring a preheating heater for preheating the steel sheet before spraying the ink on the steel sheet.

In addition, the present invention is configured with a post-heater that completely dries the ink sprayed onto the steel sheet after the ink has been sprayed onto the steel sheet, thereby completely drying the final printed surface on which a plurality of inks are laminated on the steel sheet, thereby further improving the printing quality of the steel sheet. have an improvement effect.

On the other hand, the present invention has the advantage of being able to prevent damage to the printing surface of the steel sheet by taking a structure in which the non-printing surface of the steel sheet is wound while in contact with the rear deflector roll in the tension generating unit.

In addition, the present invention has the advantage of being able to prevent the contaminants from contaminating the back surface of the steel sheet by configuring a cleaning unit for removing contaminants including ink on the surface of the back roll.

1 is a view showing a steel plate printing apparatus according to an embodiment of the present invention.
2 is a view showing a steel plate printing apparatus according to another embodiment of the present invention.

Hereinafter, preferred embodiments will be described in detail so that those of ordinary skill in the art can easily practice the present invention with reference to the accompanying drawings. However, in describing a preferred embodiment of the present invention in detail, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. In addition, the same reference numerals are used throughout the drawings for parts having similar functions and functions. In addition, in this specification, terms such as 'upper', 'upper', 'upper surface', 'lower', 'lower', 'lower surface', 'side', etc. are based on the drawings, and in fact, the components are arranged It may vary depending on the direction you are going.

In addition, throughout the specification, when a part is 'connected' with another part, it is not only 'directly connected' but also 'indirectly connected' with other components interposed therebetween. also includes In addition, 'including' a certain component means that other components may be further included, rather than excluding other components, unless otherwise stated.

1 is a view showing a steel plate printing apparatus according to an embodiment of the present invention, Figure 2 is a view showing a steel plate printing apparatus according to another embodiment of the present invention.

Referring to the drawings, the steel plate printing apparatus according to the present invention includes an ink ejecting unit 100 , a drying unit 200 , and a tension generating unit 300 .

The ink jetting unit 100 is configured to jet ink to the steel plate 1 .

In addition, the drying unit 200 is configured to dry and harden the ink sprayed on the steel plate (1).

In addition, the tension generating unit 300 is configured to maintain a constant separation distance of the steel plate 1 with respect to the ink ejection unit 100 .

Specifically, first, the tension generating unit 300 will be described as follows.

The tension generating unit 300 is disposed on the transport route of the steel plate 1, and the tension is applied to the transferred steel plate 1 in order to maintain a constant separation distance of the steel plate 1 with respect to the ink ejection unit 100. It has a configuration that generates

The tension generating unit 300 includes a front deflector roll 310 , a rear deflector roll 320 , and a back roll 330 .

Here, the front deflector roll 310 and the rear deflector roll 320 are spaced apart from each other and disposed on the transport route of the steel plate 1 , and serve to change the transport direction of the steel plate 1 .

In addition, the back roll 330 is configured to change the conveying direction of the steel sheet 1 moving between the front deflector roll 310 and the rear deflector roll 320 .

Accordingly, in the process of being transported along the transport route, the steel plate 1 is wound on the front deflector roll 310 while changing direction, and then the direction is changed while being wound on the back roll 330 , and finally, the rear deflector roll 320 . ) to change direction.

As the direction of the steel plate 1 is changed in the process of being conveyed by the front deflector roll 310, the rear deflector roll 320, and the back roll 330, which have such a direction change function, tension is generated in the steel plate 1 will do

That is, the steel plate 1 is sequentially wound around the front deflector roll 310 , the back roll 330 , and the rear deflector roll 320 to generate tension.

In addition, the ink ejection unit 100 and the drying unit 200 are arranged around the back roll 330 .

Accordingly, in a transport facility having a configuration in which the steel plate 1 wound in a coil shape is unwound and finally this steel plate 1 is wound or pulled, the present invention provides a front deflector roll to the transport route of the steel plate 1 A tension generating unit 300 having a 310, a rear deflector roll 320, and a back roll 330 is configured, and the ink jetting unit 100 is disposed around the back roll 330, so that the steel plate 1 is As tension is generated on the steel plate 1 in the process and adheres to the back roll 330, the separation distance of the steel plate 1 with respect to the ink ejection unit 100 is maintained constant, so that the print quality of the steel plate 1 is maintained. can improve

In other words, in the conventional steel plate printing apparatus, a defect in print quality may occur due to bending or lifting of the steel plate 1, and the present invention generates tension in the steel plate 1 by the tension generating unit 300 to generate a tension in the steel plate ( By keeping 1) in close contact with the back roll 330, the separation distance of the steel sheet 1 with respect to the ink ejection unit 100 is maintained constant, thereby preventing defects in the print quality of the steel sheet 1 from occurring. have.

In addition, by disposing the drying unit 200 on the periphery of the back roll 330 together with the ink jetting unit 100, the separation distance of the steel plate 1 with respect to the drying unit 200 is maintained at a constant distance. can improve the print quality of

Furthermore, the absolute coordinates of the front deflector roll 310, the rear deflector roll 320, and the back roll 330 of the tension generating unit 300 configured as described above are not specifically limited in their positions.

That is, the front deflector roll 310 and the rear deflector roll 320 only need to have an arrangement structure in which they are spaced apart from each other on the transfer route of the steel plate 1, and are not limited to a specific position, and furthermore, the process in which the steel plate 1 proceeds The back roll 330 only needs to be disposed so that the direction is switched between the front deflector roll 310 and the rear deflector roll 320 in the present invention, and a specific position is not specifically limited by the present invention.

In addition, the front deflector roll 310, the rear deflector roll 320, and the back roll 330 of the tension generating unit 300 may have a structure having a driving force for transferring the steel plate 1, and simply use the driving force as an idle roll. It is also possible to take a structure that does not have .

That is, in a transfer facility that winds up the steel plate 1 or pulls the steel plate 1 as the coil-shaped steel plate 1 is unwound, the tension generating unit 300 transports the steel plate 1 with a separate driving force. However, it may be configured only with a structure disposed at a position to change the direction of the steel plate 1 without a separate driving force.

Meanwhile, the ink ejection unit 100 and the drying unit 200 are arranged along the circumference of the back roll 330 .

Specifically, the ink jetting unit 100 includes a plurality of inkjet heads 110 , and the plurality of inkjet heads 110 are disposed to be spaced apart from each other along the circumference of the back roll 330 . Accordingly, the steel sheet 1 is printed with ink by spraying ink on the steel sheet 1 that is in close contact with the back roll 330 .

In addition, the drying unit 200 includes a plurality of drying devices 210 for drying and curing ink with hot air, and the drying devices 210 are disposed between the plurality of inkjet heads 110 , respectively.

The plurality of inkjet heads 110 and the plurality of dryers 210 are arranged in an arc-shaped structure corresponding to the back roll 330 .

In this case, the heat source of the drying unit 200 is a heat exchanger using steam, an electric heating component, or a heat source that generates hot air by raising the temperature of a gas such as a burner, that is, generating a hot air for heating the steel sheet 1, the specific Of course, the composition and type are not limited.

In addition, in the present invention, the ink sprayed from the ink jetting unit 100 includes a solvent having a chemical composition of water-soluble or volatile so that it is dried and cured by the drying unit 200 . It can be dried and cured.

Furthermore, the present invention may further include an exhaust unit 400 .

The ink jetted from the inkjet head 110 is a small droplet on the level of picoliters and is affected by the flow of the surrounding gas, such as scattering, and thus needs to be stabilized so that there is no flow of the surrounding gas in the printing section.

Accordingly, the present invention further includes an exhaust unit 400, in which the exhaust unit 400 flows to the printing section where the steel plate 1 is printed by the inkjet head 110, in which the hot air of the drying machine 210 flows. configured to block it.

Specifically, the exhaust unit 400 includes a plurality of exhaust devices 410 for discharging hot air, and these exhaust devices 410 may be disposed at front and rear sides of each of the plurality of inkjet heads 110 .

As described above, in the present invention, the exhaust device 410 is configured on each of the front and back sides of the inkjet head 110 so that the hot air sprayed from the drying device 210 does not affect the ink jetted from the inkjet head 110 , As the hot air from the dryer 210 is discharged outside the printing section, the printing quality of the steel sheet 1 can be improved.

For reference, the exhaust unit 400 may prevent the hot air coming from the preheater 600 and the postheater 700 to be described later from entering the printing section by the inkjet head 110 .

Meanwhile, the present invention may further include a preheater 600 .

The preheater 600 is disposed at a position before the steel plate 1 advances to the ink ejection unit 100 in the transport route of the steel plate 1, and before the ink is ejected by the ink ejection unit 100, the steel plate ( 1) is preheated.

This preheater 600 preheats the steel sheet 1 so that the surface temperature of the steel sheet 1 is maintained at 20° C. to 30° C. before the ink is sprayed on the steel sheet 1, and then the ink injected onto the steel sheet 1 It is possible to further improve the print quality of the steel sheet 1 by making the cohesiveness of the steel plate 1 uniform.

In addition, the present invention may further include a post-heat heater (700).

The post-heat heater 700 is disposed at a position after the steel plate 1 passes the ink ejection unit 100 in the transport route of the steel plate 1, and after the ink ejection unit 100 completes the ink ejection, the steel plate 1 ) to completely dry the sprayed ink.

The post-heat heater 700 serves to completely dry the final printed surface on which a plurality of inks are stacked on the steel plate 1 .

At this time, the post-heat heater 700 allows the drying atmosphere temperature to be maintained at 30° C. to 120° C. like the drying unit 200 described above.

For reference, the preheater 600 and the postheater 700 heat the steel plate 1 with hot air like the dryer 210 described above, and the heat source of the hot air is not limited, of course.

Meanwhile, according to an embodiment of the present invention, the front deflector roll 310 and the rear deflector roll 320 rotate in the same direction, and the back roll 330 rotates in the opposite direction to the front deflector roll 310 and the rear deflector roll 320 . It can take a rotating structure.

With this structure, as shown in FIG. 1 as an example, even if the steel plate 1 passes through the tension generating unit 300 , it can be transferred in the same direction.

As another embodiment, as shown in FIG. 2, in the present invention, while the rear deflector roll 320 rotates in the opposite direction to the front deflector roll 310 together with the back roll 330, when the steel plate 1 proceeds, the steel plate ( A winding structure can be achieved while the non-printing surface of 1) is in contact.

Accordingly, when the direction of the steel plate 1 is changed by the rear deflector roll 320 , the non-printing surface is wound in contact with the deflector roll, thereby preventing damage to the printed surface.

And, the present invention may further include a cleaning unit (500).

Since the ink ejected from the inkjet head 110 is ejected beyond the width of the steel plate 1 , it contaminates the surface of the back roll 330 , which is wider than the width of the steel plate 1 .

As such, the contaminated portion of the back roll 330 rotates again to transfer the contaminants to the back side of the steel plate 1 , thereby contaminating the steel plate 1 and causing product defects.

Accordingly, the present invention further includes a cleaning unit 500 to prevent such product defects, wherein the cleaning unit 500 is configured to remove contaminants including ink on the surface of the back roll 330 with a cleaning solution. do.

Specifically, the cleaning unit 500 may include a cleaning roll 510 and a cleaning container 520 .

The cleaning roll 510 comes into contact with the back roll 330 and interlocks with rotation of the back roll 330 .

In addition, the cleaning container 520 is disposed below the cleaning roll 510 , and contains a cleaning solution for removing contaminants transferred from the back roll 330 to the cleaning roll 510 .

Accordingly, the cleaning roll 510 comes into contact with the back roll 330 with its lower part immersed in the cleaning liquid of the cleaning container 520 and rotates in the opposite direction when the back roll 330 rotates, ), as the contaminants transferred to the cleaning roll 510 are removed, and thus contaminants including ink on the surface of the back roll 330 are eventually removed, contamination of the steel sheet 1 can be prevented.

For reference, as the cleaning liquid, purified water may be used when the chemical composition of the ink is water-soluble, and when the chemical composition of the ink is a volatile solvent, a thinner, cyclohexanone, or a solvent of the same series such as alcohol may be used.

As a result, in the present invention, the tension generating unit 300 for generating tension on the steel plate 1 in the process of the steel plate 1 is configured, and the ink ejecting unit 100 is the back roll 330 of the tension generating unit 300 . ) to prevent bending or lifting of the steel plate 1, and as the steel plate 1 is closely attached to the back roll 330, the separation distance of the steel plate 1 with respect to the ink jetting unit 100 is increased. It is possible to improve the printing quality of the steel sheet 1 by maintaining it constant.

In addition, the present invention provides an inkjet head 110 so that the hot air sprayed from the drying unit 200 , the preheater 600 , and the postheater 700 does not affect the ink sprayed from the inkjet head 110 . Since the exhaust unit 400 is configured on each of the front and rear sides, the hot air is discharged out of the printing section through the exhaust unit 400 , so that the printing quality of the steel sheet 1 can be improved.

In addition, according to the present invention, a preheater 600 for preheating the steel sheet 1 before spraying the ink on the steel sheet 1 is configured to uniform the cohesiveness of the ink sprayed on the steel sheet 1, so that the steel sheet 1 is print quality can be further improved.

In addition, according to the present invention, a post-heat heater 700 for completely drying the ink sprayed on the steel plate 1 after the ink has been sprayed on the steel plate 1 is configured, so that the final printing surface on which a plurality of inks are laminated on the steel plate 1 . It is possible to further improve the print quality of the steel sheet 1 by completely drying the.

On the other hand, the present invention can prevent damage to the printed surface of the steel plate 1 by taking a structure in which the non-printed surface of the steel plate 1 is in contact with the rear deflector roll 320 in the tension generating unit 300 and wound. .

And, according to the present invention, since the cleaning unit 500 for removing contaminants including ink on the surface of the back roll 330 is configured, it is possible to prevent contaminants from contaminating the back surface of the steel sheet 1 .

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, those of ordinary skill in the art to which the present invention pertains will realize that the present invention can be implemented in other specific forms without changing the technical spirit or essential features thereof. You will understand. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive.

100: ink ejection unit 110: inkjet head
200: drying unit 210: drying equipment
300: tension generating unit 310: front deflector roll
320: rear deflector roll 330: back roll
400: exhaust unit 410: exhaust device
500: cleaning unit 510: cleaning roll
520: cleaning container 600: preheater
700: after-heat heater

Claims (10)

an ink jetting unit for jetting ink onto the steel plate;
a drying unit for drying and curing the ink sprayed on the steel sheet; and
a tension generating unit disposed in the transport route of the steel plate and having a back roll to which the steel plate is closely adhered so as to maintain a constant separation distance of the steel plate with respect to the ink ejection unit; and
The ink ejection unit and the drying unit are disposed along the circumference of the back roll.
According to claim 1,
The tension generating unit,
a front deflector roll and a rear deflector roll arranged to be spaced apart from each other in the conveying route of the steel sheet and for changing the conveying direction of the steel sheet; and
The back roll that generates tension in the steel plate to change the conveying direction of the steel plate, which proceeds between the front deflector roll and the rear deflector roll, so that the steel plate is in close contact with the steel plate;
The steel plate printing apparatus, characterized in that the tension is generated by sequentially winding the steel plate on the front deflector roll, the back roll, and the rear deflector roll.
3. The method of claim 2,
The ink jetting unit includes a plurality of inkjet heads, the plurality of inkjet heads are disposed to be spaced apart from each other along the circumference of the back roll,
The drying unit includes a plurality of drying devices for drying and curing the ink with hot air, and the drying devices are disposed between the plurality of inkjet heads, respectively.
The plurality of inkjet heads and the plurality of dryers are arranged in an arc-shaped structure corresponding to the back roll.
4. The method of claim 3,
It further includes; an exhaust unit configured to block the hot air of the dryer from flowing to the printing section where the steel sheet is printed by the inkjet head,
The exhaust unit includes a plurality of exhaust devices for discharging hot air, and the exhaust devices are disposed on front and back sides of each of the plurality of inkjet heads.
3. The method of claim 2,
The front deflector roll and the rear deflector roll rotate in the same direction, and the back roll rotates in opposite directions to the front deflector roll and the rear deflector roll.
3. The method of claim 2,
The rear deflector roll rotates in the opposite direction to the front deflector roll together with the back roll, and as the steel plate advances, the non-printing surface of the steel plate is in contact with the rear deflector roll to form a winding structure.
3. The method of claim 2,
Further comprising; a cleaning unit configured to remove contaminants including ink on the surface of the back roll with a cleaning solution;
The cleaning unit,
a cleaning roll that is in contact with the back roll and rotates interlockingly according to the rotation of the back roll; and
a cleaning container disposed below the cleaning roll and accommodating a cleaning solution for removing contaminants transferred from the back roll to the cleaning roll;
A steel plate printing apparatus comprising a.
According to claim 1,
a preheating heater disposed at a position before the steel sheet advances to the ink jetting unit in the transport route of the steel sheet and preheating the steel sheet before ink is jetted by the ink jetting unit;
Steel plate printing apparatus, characterized in that it further comprises.
According to claim 1,
a post-heat heater disposed at a position after the steel sheet has passed the ink jetting unit in the transport route of the steel sheet, and completely drying the ink jetted onto the steel sheet after the ink jetting is completed by the ink jetting unit;
Steel plate printing apparatus, characterized in that it further comprises.
According to claim 1,
The ink jetted from the ink ejection unit is a steel plate printing apparatus, characterized in that the chemical composition contains a water-soluble or volatile solvent to dry and harden.

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