JP2019000841A - Manufacturing device of coated steel plate - Google Patents

Abstract

To provide a manufacturing device of a coated steel plate using ink jet printing.SOLUTION: A manufacturing device of a coated steel plate includes a printer which prints on a steel plate surface by using ink jet printing. The printer includes ink heads and curing devices alternately arranged in a print region along a travelling direction of the steel plate. The curing device includes a shield cover which houses at least a part of beams reflected by the steel plate surface so as to reduce effect of the beams irradiated from an irradiation part of the curing device and reflected by the steel plate surface to ink droplets dropping from the adjacent ink head.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a coated steel sheet manufacturing apparatus, and more specifically to a coated steel sheet manufacturing apparatus using ink jet printing.

  The steel plate on which the pattern is printed can be divided into a printed steel plate using a silk screen, a printed steel plate using a roll printer, and a printed steel plate using a pattern transfer paper. Silk screen printing steel sheet uses a printing process on a sheet (Sheet) instead of a coil in an intermittent batch type (Batch Type) process. Roll printing steel sheet uses ink or paint on a roll on which a printed pattern is etched. The method of coating with a pattern is used, and as the printed steel sheet for pattern transfer paper, a method is used in which the transfer paper on which the pattern is engraved is transferred to the steel sheet.

  However, such conventional techniques have problems.

  In the case of the silk screen method, the production process is relatively simple, but depending on the pattern and product type to be printed, a screen that is a printing plate must be produced separately, and the number and type of colors. Accordingly, there is a disadvantage that the number of screens increases, which eventually slows down the work speed and makes the productivity weak.

  Unlike the silk screen method, the roll printing method is highly productive because it is a continuous coil coating method, but the printed pattern is simple, and it is difficult to implement various patterns, making it difficult to diversify the product design. In addition, as with the silk screen method, the number of printing rolls increases with the number of colors, and there is a disadvantage that the production efficiency decreases due to the complexity of the production process.

JP 2013-111844 A

  Embodiments of the present invention provide a coated steel plate manufacturing apparatus capable of improving productivity and printing quality even when the printing height is high when a printed pattern is coated on a steel plate using inkjet printing.

  According to one aspect of the present invention, the printing apparatus includes a printing apparatus that prints on a steel sheet surface using ink jet printing, and the printing apparatus includes an ink head and a curing apparatus that are alternately arranged on a printing area along a traveling direction of the steel sheet. The curing device reflects on the surface of the steel plate so as to reduce the influence of the beam reflected from the irradiation unit of the curing device and reflected on the surface of the steel plate from affecting ink droplets falling from an adjacent ink head. An apparatus for producing a coated steel sheet including a shielding cover that accommodates at least a part of the processed beam can be provided.

  In addition, the shielding cover includes an upper frame to which the curing device is coupled, and a side frame extending from the periphery of the upper frame to the lower portion.

  In addition, at least one hole may be formed in the upper frame.

  In addition, an ultraviolet absorbing member for absorbing ultraviolet rays may be provided on the inner wall of the shielding cover.

  In addition, a base frame that connects the ink head and the lower frame so as to constrain the ink head and the shielding cover as one device is further included, and the base frame includes a first frame that exposes nozzles of the ink head. A second opening having a size corresponding to an opened lower portion of the shielding cover may be formed to expose the opening and the irradiation unit of the curing device.

  The upper frame may be provided with an opening through which the irradiation unit of the curing device is exposed.

  Moreover, the distance (L) between the beam vertically irradiated from the irradiation unit of the curing apparatus and the side frame satisfies the following formula 1.

(Formula 1)
L> = 2H / tan θ

  Here, H is the height of printing.

  The apparatus further includes a close contact transfer unit that supports the steel plate under a printing area of the printing apparatus.

  The apparatus further includes a tension control device that applies tension to the steel plate, a meander control device for preventing meandering of the steel plate, and a speed control device that maintains the traveling speed of the steel plate.

  The apparatus for manufacturing a coated steel sheet using inkjet printing according to an embodiment of the present invention does not cause image blur even when the printing height must be increased due to poor flatness of the steel sheet. Print quality can be improved.

1 is a schematic view illustrating an apparatus for manufacturing a coated steel sheet according to an embodiment of the present invention. 1 is a side view illustrating a printing unit according to an embodiment of the present invention. It is a bottom view showing a printing unit according to an embodiment of the present invention. It is a photograph which shows the image printed on the steel plate along the height of printing. It is a photograph which shows the image printed on the steel plate along the height of printing. FIG. 5 illustrates that ink droplets falling from an ink head are affected by a reflected beam when the printing height according to an embodiment of the present invention is increased. FIG. 1 is a perspective view illustrating a shielding cover according to an embodiment of the present invention. 1 is a cross-sectional view illustrating a shielding cover according to an embodiment of the present invention. 4 shows a path of a reflected beam inside a shielding cover according to an embodiment of the present invention. 6 shows a path of a reflected beam inside a shielding cover according to another embodiment of the present invention. It is a structural diagram for explaining a close contact transfer unit according to an embodiment of the present invention.

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

  The embodiment introduced below is provided as an example so that the idea of the present invention can be sufficiently transmitted to those who have ordinary knowledge in the technical field to which the present invention belongs. The present invention is not limited to the examples described below, and may be embodied in other forms. In order to clearly describe the present invention, portions not related to the description are omitted in the drawings, and in the drawings, the width, length, thickness, and the like of components may be exaggerated for convenience. Like reference numerals refer to like elements throughout the specification.

  FIG. 1 is a schematic view illustrating an apparatus for producing a coated steel sheet according to an embodiment of the present invention.

  Although not shown in the drawings, the steel sheet undergoes a process of forming a coating layer before proceeding to the printing process. That is, the apparatus for manufacturing a coated steel sheet may include a process of forming a coating film layer and a process of forming a printing layer on the coating film layer using inkjet printing. Here, the coated steel sheet means a steel sheet having a coating layer or printed layer formed on the surface.

  In order to keep the steel plate not bent and in a flat state, the coated steel plate manufacturing apparatus is a tension control device 10 that applies tension, and the steel plate does not move along the center of the production line but moves to the left and right. The meandering control device 20 for preventing the printing, when the printing ink is dropped on the steel plate, the speed control devices 30 and 40 for maintaining the traveling speed of the steel plate so that the ink accurately falls to the required position, and the printing ink is dropped on the steel plate. Or the printing apparatus 100 which prints a color may be included.

  Referring to the drawings, the tension control device 10, meander control device 20, deflector roll 51 (Defect Roll), dancer roll 53 (Dancer Roll), speed control device 30, printing device 100, deflector roll 52, And the speed control apparatus 40 may be provided continuously.

The tension control device 10 can maintain the steel plate within a set tension range by adjusting the speed and contact angle of the tension bridle rolls 11 and 12 (TBR; Tension Bridle Roll). The range of the tension can be set within a range in which the surface shape of the steel plate is flattened but the fracture does not occur due to excessive tension. As an example, the range of tension to 2 kgf / mm ² without be set within the range of 4 kgf / mm ^2. At this time, the tension error of the steel sheet can be adjusted to be within a range of −1% to + 1% to maintain the tension of the steel sheet.

  The tension bridle rolls 11, 12 can include two rolls arranged adjacent to each other. Then, the steel sheet enters along the upper surface of the tension bridle roll 11 located in the entry direction (hereinafter referred to as the front) and along the lower surface of the tension bridle roll 12 located in the advance direction (hereinafter referred to as the rear). Advance. At this time, the size of the tension applied to the steel sheet can be adjusted by changing the vertical position (or horizontal position) of any one of the tension bridle rolls 11 and 12.

  A tension measurement sensor 13 that measures the tension of the steel plate can be installed behind the tension bridle rolls 11 and 12. The tension measurement sensor 13 measures the tension of the steel plate and transmits a signal to the tension control system 14. The tension control system 14 transmits an operation signal to the tension bridle rolls 11 and 12 so as to lower the tension of the steel sheet when the tension of the steel sheet is measured beyond the set range, and measures the tension of the steel sheet below the set range. If so, an operation signal is transmitted to the tension bridle rolls 11 and 12 so as to increase the tension of the steel plate.

  The meandering control device 20 adjusts the axis of the steering rolls 21 and 22 (SR; Steering Roll) according to the meandering amount such that the center position in the width direction of the steel plate notified by the meandering measurement sensor 23 deviates from the center of the steel plate transfer line. Can be rotated and moved. As an example, the meandering amount of the steel sheet can be controlled within a range of −1 mm to +1 mm.

  The steering rolls 21 and 22 can be located behind the tension bridle rolls 11 and 12.

  Further, the steering rolls 21 and 22 can include two rolls arranged adjacent to each other. And a steel plate can be transferred along the upper surface of two adjacent rolls. At this time, the meandering of the steel sheet can be controlled by changing the position in the width direction of the steel sheet of one of the steering rolls 21 and 22 (or the inclination of the rotating shaft in the width direction of the steel sheet).

  A meandering measurement sensor 23 that measures the meandering of the steel sheet can be installed behind the steering rolls 21 and 22. The meandering measurement sensor 23 measures the meandering of the steel sheet and transmits a signal to the meandering control system 24. Then, the meander control system 24 transmits an operation signal to the steering rolls 21 and 22 so that the steel plate moves to the left side when the steel plate meanders to the right side, and moves the steel plate to the right side when the steel plate meanders to the left side. Thus, the operation signal is transmitted to the steering rolls 21 and 22.

  Further, the meandering measurement sensor 23 can be connected to the printing apparatus 100. As an example, when the degree of meandering of the steel sheet exceeds a dangerous range, the operation of the printing apparatus 100 can be stopped.

  The speed control devices 30 and 40 can maintain the speed in the traveling direction of the steel sheet at the set speed by adjusting the rotational speed of the pinch rolls 31 and 41 (PR; Pin Roll). This is because the printing ink can drop to the target position only when the speed of the steel plate is maintained constant. As an example, the set speed of the steel plate can be selected within a range of 30 mpm to 50 mpm. At this time, the fluctuation amount of the actual traveling speed of the steel sheet can be managed within a range of −21 μm / sec to +21 μm / sec.

  The pinch rolls 31 and 41 may include two rolls arranged above and below the steel plate. At this time, the traveling speed of the steel sheet can be adjusted by changing the rotational speed of any one or more pinch rolls 31 and 41.

  Moreover, the pinch rolls 31 and 41 can reduce the vibration of the width direction, fixing the movement to the width direction of a steel plate. As an example, the pinch rolls 31 and 41 are adjusted so that the horizontal vibration width of the steel sheet is maintained within a range of −11 μm to +11 μm.

  Further, the pinch rolls 31 and 41 can be installed at any one or more of the front and rear of the printing apparatus 100. In the drawing, the pinch rolls 31 and 41 are installed on both the front and rear sides of the printing apparatus 100. However, the pinch rolls 31 and 41 are installed only at the rear of the printing apparatus 100 to control the speed while pulling the steel sheet, or are installed only at the front of the printing apparatus 100 to control the speed while extruding the steel sheet. You can also.

  And the deflector rolls 51 and 52 can be used in order to change the advancing direction and angle of a steel plate. As an example, it is provided between the meandering control device 20 and the speed control devices 30 and 40 to change the traveling direction of the steel plate, and is provided between the printing device 100 and the speed control devices 30 and 40 to change the traveling direction of the steel plate. Can be changed.

  And the dancer roll 53 can move within a small range in the vertical direction of the steel sheet by installing a vibration reducing member between the dancer roll 53 and the base. Therefore, the dancer roll 53 can reduce the vibration of the steel sheet and can also adjust the tension of the steel sheet. Specifically, the dancer roll 53 can reduce the vibration of the steel plate that occurs as it passes through the tension control device 10 and the meandering control device 20. As an example, the dancer roll 53 is adjusted so that the vertical vibration width of the steel plate is maintained within −60 μm to +60 μm.

  On the other hand, the printing apparatus 100 adjusts the upper and lower positions of the steel sheet, and the close-contact transfer unit 120 that allows the steel sheet to be spread flat without being bent in the jetting zone or the printing area (A) where the ink falls. It may include a position adjusting unit for the steel plate support rolls 131 and 132 to be printed and a printing unit 110 for dropping printing ink on the steel plate.

  The close contact transfer unit 120 can flatten the surface of the steel sheet by bringing the steel sheet into close contact with the conveyor belt 133. The flatness of the steel plate surface described above is achieved through the tension control device 10. However, although it is fine, a residual wave remains on the surface of the steel sheet. As will be described later, since the distance between the ink head 111 and the steel plate is provided in the range of 0.8 mm to 1.2 mm, the printing apparatus is used when a steel plate moving at a speed of 30 mpm to 50 mpm collides with the ink head 111. 100 can be damaged. Accordingly, the residual wave is removed using another close transfer unit 120.

  And the position adjustment unit of the steel plate support rolls 131 and 132 adjusts the vertical position of the steel plate support rolls 131 and 132 that control the vertical position of the specified steel plate while supporting the steel plate, and the printing ink is applied to the steel plate. You can make it fall into the exact position. As an example, the position adjustment unit of the steel plate support rolls 131 and 132 can adjust the vertical position of the steel plate support rolls 131 and 132 so that the vertical vibration width of the steel plate is maintained within −60 μm to +60 μm.

  The printing unit 110 may perform printing design on the surface of the steel sheet by ejecting printing ink onto the steel sheet moving within the printing area (A).

  FIG. 2 is a side view illustrating a printing unit according to an embodiment of the present invention, and FIG. 3 is a bottom view illustrating the printing unit according to an embodiment of the present invention.

  Referring to FIGS. 1 to 3, the printing unit 110 includes an ink head 111 on which a nozzle 112 for ejecting printing ink is mounted, and an ink that has fallen on a steel plate so that it does not exceed an appropriate diffusion amount. It may include a curing device 113 that hardens the ink and an ink supply device 114 that can continuously supply the ink without bubbles.

  The ink head 111 is provided with a plurality of nozzles 112 arranged to face downward, and the plurality of nozzles 112 are arranged side by side in the width direction of the steel plate, but may be arranged at uniform intervals.

  The ink supply device 114 can be connected to the ink head 111 and can be connected to the ink head 111 so that the ink supply device 114 can be detached.

  In addition, a plurality of ink heads 111 may be arranged side by side in the traveling direction of the steel plate. At this time, each ink head 111 arranged in the traveling direction of the steel plate can eject inks of different colors. As an example, the ink heads 111 that eject C (Cyan), M (Magenta), Y (Yellow), and K (Black) inks from the front in the traveling direction of the steel sheet may be arranged side by side.

  In addition, the ink head 111 that ejects ink having one color can be arranged so that the plurality of ink heads 111 overlap in the width direction of the steel plate. If the length of the ink head 111 is sufficient to cover the width of the steel plate, one ink head 111 can be responsible for one color, but the length of the ink head 111 is the width of the steel plate. If the length is smaller than the length of the plurality of ink heads 111, a plurality of ink heads 111 may be connected in the width direction of the steel plate.

  In the embodiment of the present invention, the two ink heads 111 are arranged side by side in the width direction of the steel plate. At this time, the ink head 111 is disposed so as to partially overlap, but the nozzle 112 may be disposed so as not to overlap. More specifically, the distance between the position of the leftmost outermost nozzle 112 of the ink head 111 positioned on the left side and the rightmost outermost nozzle 112 of the ink head 111 positioned on the right side is equal to the adjacent nozzle 112. Can be arranged to coincide with the spacing between them.

  The curing device 113 can cure the ink using ultraviolet rays (UV). The ink droplets (Droplets) ejected onto the steel sheet can continuously spread over time. However, the larger the ink droplet size, the lower the resolution of the printing image. Therefore, the curing device 113 can harden the ink so that the ink does not exceed the proper diffusion amount.

  The curing device 113 can be disposed behind the ink head 111. As an example, the curing device 113 may be disposed behind the ink head 111 that handles one color. In this case, the C color ink head 111, the curing device 113, the M color ink head 111, the curing device 113, the Y color ink head 111, the curing device 113, the K color ink head 111, and the curing in the traveling direction of the steel plate. Devices 113 can be arranged side by side.

  In addition, the printing unit 110 according to the embodiment of the present invention may include a base frame 115 that fixes the ink head 111 and the curing device 113. The base frame 115 can constrain a plurality of ink heads 111 and a plurality of curing devices 113 as one device. As an example, the base frame 115 may be disposed across the plurality of ink heads 111 and the plurality of curing devices 113.

  The base frame 115 can form an opening 115 a that exposes the nozzle 112 of the ink head 111 and an opening 115 b that exposes the irradiation portion of the curing device 113. Here, the opening 115b has a size corresponding to an opened lower portion of a shielding cover 200 described later.

  The base frame 115 can secure a uniform flow field in the printing region (A) by securing a flow development distance so that the ink droplets accurately fall to the target position.

  For this reason, the bottom surface of the base frame 115 may be located under the ink head 111. As an example, the bottom surface of the base frame 115 may be located at the lowest position in a range that does not descend below the position of the nozzle 112.

  The base frame 115 can prevent the ink drop point from being changed by the airflow around the nozzle 112. In other words, the base frame 115 may be provided so as to extend a certain distance in front and rear and both sides of the nozzle 112 so that a uniform flow is formed in the printing region (A). Here, the printing area (A) means an area where the nozzle 112 is located or an area where ink is dropped and a printing image is formed.

  On the other hand, the distance between the steel plate and the nozzle 112 of the ink head 111 may be adjusted in the range of 0.8 mm to 1.2 mm. When the distance between the steel plate and the nozzle 112 is longer than 1.2 mm, it is difficult to accurately control the position where the ink falls, and the quality of the printing image is deteriorated. This is because the ink falls on the steel plate that moves at a high speed and is affected by the surrounding airflow during the fall. Further, when the distance between the steel plate and the nozzle 112 is smaller than 0.8 mm, the steel plate may collide with the ink head 111. The steel plate is not provided on a perfect plane, and a safe distance is required between the steel plate and the ink head 111 in order to include fine waves.

  However, because of the poor flatness of the steel plate itself, it may be necessary to increase the printing height.

  FIG. 4 shows the image quality according to the printing height.

  When the printing height is 1 mm as shown in FIG. 4A, a vivid and dark image is realized. On the other hand, when the printing height is 3 mm as shown in FIG. 4B, the image is blurred. You can see that. This is because the ink dropped on the steel sheet is not sufficiently spread and hardened.

  As shown in FIG. 5, the ultraviolet beam (B) irradiated to the steel plate from the irradiation unit of the curing device 113 is reflected by the steel plate, and the reflected beam (B1) reaching the vicinity of the adjacent ink head 111 is the ink head. By preliminarily curing the ink droplet (I) falling from 111, the diffusibility in the steel plate is weakened. In other words, as the printing height (H) increases, the degree of influence of the ink droplet (I) by the reflected ultraviolet beam increases.

  In order to prevent this, the curing device 113 according to the embodiment of the present invention is configured so that the ultraviolet beam irradiated from the irradiation unit of the curing device 113 is reflected by the steel plate and then reaches the vicinity of the ink head 111 to reach the ink head. A shielding cover 200 is included to accommodate at least a portion of the beam reflected by the steel plate so as to reduce the effect (pre-curing) of the ink droplets falling from 111.

  The shielding cover 200 guides the ultraviolet beam (B1) irradiated from the irradiation unit 113a of the curing device 113 and reflected by the steel plate to the inside of the shielding cover 200, so that the beam (B1) reaching the adjacent ink head 111 is obtained. ) Can be reduced.

  Referring to FIGS. 6 and 7, the shielding cover 200 may have a box shape in which a lower part is opened so as to surround the ultraviolet beam region (B) irradiated from the irradiation unit 113 a of the curing device 113.

  The shielding cover 200 includes an upper frame 201 to which the curing device 113 is coupled, and a side frame 202 that is formed to extend downward at a predetermined length around an end of the upper frame 201.

  The upper frame 201 is provided with an opening 201 a through which the irradiation unit 113 a of the curing device 113 is exposed, and the lower end of the side frame 202 can be positioned so as not to protrude from the bottom surface of the base frame 115.

  The extension length of the side frame 202 can be designed so that the irradiation part 113a of the curing device 113 located on the upper frame 201 does not exceed a height of about 10 mm from the steel plate. This is because there is almost no change in intensity (intensity) of the ultraviolet rays irradiated to the steel plate from the irradiation unit 113a at a height of about 10 mm from the steel plate.

  The width (W) of the upper frame 201 is designed to be sufficiently wider than the width of the beam (B) irradiated to induce internal reflection of the beam (B) irradiated to the steel plate.

  As an example, the irradiation angle (θ) of the beam (B) irradiated from the irradiation unit 113a of the curing device 113 usually has an irradiation angle of 55 to 60 degrees, and is 20 to 25 degrees when using the condenser lens. The irradiation angle can be reduced. In this case, it is preferable that the distance (L) between the beam vertically irradiated from the irradiation unit 113a and the side frame 202 satisfies Expression 1.

(Formula 1)
L> = 2H / tan θ

  Here, H is the height of printing.

  On the other hand, since the beam reflected by the inner wall of the shielding cover 200 is repeatedly refracted and reflected, a part of the beam flows to the outside through the opened lower portion of the shielding cover 200 and is adjacent to the adjacent ink head 111. It can be reached.

  In order to prevent this, the upper frame 201 may be formed with at least one hole 203 opened so that a beam reflected in the shielding cover 200 leaks to the upper part of the upper frame 201.

  Through these configurations, when the beam (B) irradiated from the irradiation unit 113a is reflected by the steel plate as shown in FIG. 8, a part of the beam (B1) is reflected on the inner wall of the shielding cover 200 in the upper frame. Since it flows out to the outside through the hole 203 of 201, the beam which reaches the adjacent ink head 111 through the open lower part of the shielding cover 200 decreases.

  On the other hand, referring to FIG. 9, an ultraviolet absorbing member 210 may be provided on the inner wall of the shielding cover 200 in order to reduce the number of reflections of the beam reflected by the inner wall of the shielding cover 200.

  The ultraviolet absorbing member 210 may be made of a benzene-based organic chemical substance such as oxybenzone or avobenzone, or a known ultraviolet absorbing substance, and is attached to the inner wall of the shielding cover 200 in the form of a coating or a film. Can do.

  Accordingly, a part of the beam reflected by the steel plate and reflected inside the shielding cover 200 is absorbed by the ultraviolet absorbing member 210, thereby reducing the number of beam reflections and leaking the beam leaking outside the shielding cover 200. It can be greatly reduced.

  Table 1 shows the presence or absence of the shielding cover of this embodiment and the presence or absence of image blur depending on the printing height under the conditions of the steel plate speed of 50 mpm, the ink jet speed of 20 Khz, and the resolution of 600 dpi. It is.

  If the printing height should be increased, if the shielding cover 200 of this embodiment is mounted, the image is not blurred even if the printing height is increased to 3 mm and printing is performed. It can be seen that a vivid image can be printed while preventing damage to the ink head due to poor flatness of the steel plate.

  FIG. 10 is a structural diagram for explaining a close-contact transfer unit according to an embodiment of the present invention.

  The close contact transfer unit 120 includes steel plate support rolls 131 and 132 that support the steel plate in front of and behind the steel plate, a conveyor belt 133 that moves with the steel plate while rotating, and a vacuum chamber 134 in which a vacuum pressure that adsorbs the steel plate is formed. And a pump 135 that provides vacuum pressure.

  The steel plate support rolls 131 and 132 may be provided integrally with a conveyor support roll that supports the conveyor belt 133. In this case, the conveyor belt 133 may be disposed so as to surround the plurality of steel plate support rolls 131 and 132 to form a caterpillar. The steel plate is supported on the conveyor belt 133 and can move together with the conveyor belt 133.

  The conveyor belt 133 can be provided so that shape deformation is possible. Therefore, even when the rotational trajectory is not circular, continuous rotational motion is possible. The steel plate support roll 131 positioned in front of the conveyor belt 133 and the steel plate support roll 132 positioned in the rear apply tension to the conveyor belt 133 so that the conveyor belt 133 is maintained flat in the printing area (A). You can do so. However, since a fine wave exists in the steel sheet entering the close-contact transfer unit 120, there is a possibility that a gap may be generated between the steel plate and the conveyor belt 133 even if the conveyor belt 133 is kept flat.

  On the other hand, as described above, since the distance between the steel plate and the ink head 111 is short, it has been explained that the distance between the steel plate and the ink head 111 should be constant. For this purpose, the close-contact transfer unit 120 can form a vacuum pressure on the conveyor belt 133 in order to bring the steel plate into close contact with the conveyor belt 133.

  For this, a vacuum chamber 134 may be provided in the internal space of the conveyor belt 133, and the vacuum chamber 134 may be connected to a pump 135 to form a vacuum pressure. The conveyor belt 133 can form a plurality of vacuum holes or vacuum slits so that the vacuum pressure can act on the steel plate. That is, the vacuum pressure formed in the vacuum chamber 134 acts on the steel plate through the vacuum hole or the vacuum slit to adsorb the steel plate. Therefore, the steel plate can be in close contact with the conveyor belt 133 and flattened.

  Although the present invention has been described with reference to the embodiments shown in the accompanying drawings, this is merely illustrative and will be understood by those of ordinary skill in the art in the future. It should be understood that various modifications and other equivalent embodiments are possible. Accordingly, the true scope of the invention should be determined by the appended claims.

10: Tension control device,
11, 12: Tension bridle roll,
13: Tension measurement sensor,
14: Tension control system,
20: Meander control device,
21, 22: Steering roll,
23: Meander measuring sensor,
24: Meander control system,
30, 40: Speed control device,
31, 41: pinch roll,
51, 52: Deflector roll,
53: Dancer roll,
100: printing device,
110: Printing unit,
111: Ink head,
112: Nozzle,
113: Curing device,
115: base frame,
120: Close transfer unit,
200: shielding cover,
201: upper frame,
202: side frame,
203: Hall,
210: UV absorbing member

Claims (9)

Including a printing device that prints on the surface of a steel plate using inkjet printing,
In the printing apparatus, an ink head and a curing device are alternately arranged along a traveling direction of the steel plate on a printing region,
The curing device is reflected on the steel plate surface so as to reduce the influence of the beam reflected and reflected from the irradiation unit of the curing device on the ink droplet falling from the adjacent ink head. An apparatus for producing a coated steel sheet, comprising a shielding cover for accommodating at least a part of a beam.   The said shielding cover is a manufacturing apparatus of the coated steel plate of Claim 1 containing the upper frame with which the said hardening apparatus is combined, and the side frame extended and formed in the lower part from the circumference | surroundings of the said upper frame.   The apparatus for manufacturing a coated steel plate according to claim 2, wherein at least one hole is formed in the upper frame.   The coated steel sheet manufacturing apparatus according to claim 2, wherein an ultraviolet absorbing member for absorbing ultraviolet rays is provided on an inner wall of the shielding cover. A base frame connecting the ink head and the lower frame so as to restrain the ink head and the shielding cover as one device;
The base frame is formed with a first opening for exposing the nozzles of the ink head and a second opening having a size corresponding to an open lower portion of the shielding cover so as to expose an irradiation part of the curing device. The manufacturing apparatus of the coated steel plate of Claim 2.   The apparatus for manufacturing a coated steel sheet according to claim 2, wherein the upper frame is provided with an opening through which an irradiation part of the curing device is exposed. The apparatus (1) for manufacturing a coated steel sheet according to claim 2, wherein a distance (L) between the beam vertically irradiated from the irradiation unit of the curing device and the side frame satisfies the following formula (1).
(Formula 1)
L> = 2H / tan θ
Here, H is the height of printing.   The manufacturing apparatus of the coated steel plate of Claim 1 which further contains the contact | adherence transfer unit which supports the said steel plate under the printing area | region of the said printing apparatus.   The coated steel sheet according to claim 1, further comprising: a tension control device that applies tension to the steel plate; a meander control device for preventing meandering of the steel plate; and a speed control device that maintains a traveling speed of the steel plate. manufacturing device.

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