WO2017078433A1 - Appareil de fabrication de tôle d'acier revêtue par impression par jet d'encre - Google Patents

Appareil de fabrication de tôle d'acier revêtue par impression par jet d'encre Download PDF

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Publication number
WO2017078433A1
WO2017078433A1 PCT/KR2016/012602 KR2016012602W WO2017078433A1 WO 2017078433 A1 WO2017078433 A1 WO 2017078433A1 KR 2016012602 W KR2016012602 W KR 2016012602W WO 2017078433 A1 WO2017078433 A1 WO 2017078433A1
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WO
WIPO (PCT)
Prior art keywords
steel sheet
ink head
ink
printing
base frame
Prior art date
Application number
PCT/KR2016/012602
Other languages
English (en)
Korean (ko)
Inventor
김경석
이소연
유석진
홍완기
원성연
Original Assignee
주식회사 포스코
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1020160105305A external-priority patent/KR20180021321A/ko
Application filed by 주식회사 포스코 filed Critical 주식회사 포스코
Priority to JP2018522654A priority Critical patent/JP6735824B2/ja
Priority to CN201680064072.XA priority patent/CN108349243B/zh
Publication of WO2017078433A1 publication Critical patent/WO2017078433A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
    • B41J3/407—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for marking on special material
    • B41J3/413—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for marking on special material for metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J11/00—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J11/00—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/0015—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form for treating before, during or after printing or for uniform coating or laminating the copy material before or after printing
    • B41J11/002—Curing or drying the ink on the copy materials, e.g. by heating or irradiating
    • B41J11/0021—Curing or drying the ink on the copy materials, e.g. by heating or irradiating using irradiation
    • B41J11/00214—Curing or drying the ink on the copy materials, e.g. by heating or irradiating using irradiation using UV radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J15/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in continuous form, e.g. webs
    • B41J15/04—Supporting, feeding, or guiding devices; Mountings for web rolls or spindles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
    • B41J3/54—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed with two or more sets of type or printing elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/26—Printing on other surfaces than ordinary paper
    • B41M1/28—Printing on other surfaces than ordinary paper on metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock

Definitions

  • the present invention relates to an apparatus for producing coated steel sheet, and more particularly, to an apparatus for producing coated steel sheet using inkjet printing.
  • the steel plate on which the pattern is printed may be divided into a printed steel sheet using a silk screen, a printed steel sheet using a roll printer, and a printed steel sheet using a pattern transfer paper.
  • Silk screen printed steel sheet is an intermittent batch type process using a printing process on a sheet rather than a coil, and roll printed steel sheet is coated with ink or paint on a roll with a printed pattern.
  • the pattern transfer paper-printed steel sheet uses a method of transferring a transfer paper having a pattern on the steel sheet.
  • the manufacturing process is relatively simple, but the screen, which is a printing plate, must be separately manufactured according to the pattern or product to be printed, and the number of screens increases according to the number or types of colors. Slow productivity is weak.
  • the roll printing method has a high productivity due to the continuous coil coating method, but it is difficult to diversify the product design because the printed pattern is simple and it is difficult to realize various patterns.
  • the number of printing rolls increases with the number of colors, and production efficiency is lowered due to the complexity of the production process.
  • An embodiment of the present invention is to provide an apparatus for manufacturing a coated steel sheet that can improve productivity and print quality by using inkjet printing.
  • An object of the present invention is to provide an apparatus for manufacturing a coated steel sheet, which can secure a uniform flow field in a direction in which the steel sheet proceeds so that the ink droplets fall precisely at a desired position within the printing area.
  • a printing apparatus for printing inkjet printing on a steel sheet surface comprising: a plurality of ink heads disposed in the advancing direction of the steel sheet on a printing area;
  • An apparatus for manufacturing a coated steel sheet may be provided that includes a plurality of curing devices disposed behind the ink head (the direction in which the steel sheet travels) to cure the ink droplets falling on the steel sheet.
  • the printing apparatus may be configured to constrain the plurality of ink heads and the plurality of curing apparatuses into a single apparatus, wherein a first opening exposing the nozzle of the ink head and a second opening exposing the irradiating portion of the curing apparatus are formed.
  • the base frame may be further included.
  • the base frame is provided to extend laterally in front of, behind, and both sides of the ink head, thereby preventing occurrence of non-uniform flow around the ink head.
  • the printing apparatus may further include a dummy ink head disposed in front of the ink head positioned at the most front of the plurality of ink heads.
  • the apparatus may further include a dummy curing apparatus disposed between the dummy ink head and the ink head located most forward.
  • the plurality of ink heads and the plurality of curing apparatuses are disposed at regular intervals from each other, and the dummy ink head is located at the front of the ink head located at the most front at the same interval as the interval between the plurality of ink heads. Can be placed in.
  • the apparatus may further include a close conveyance unit supporting the steel sheet under a printing area of the printing apparatus, wherein the close conveyance unit may include a support part supporting the steel sheet and including a curved convex surface upward.
  • the support portion is provided to enable the shape deformation, the conveyor belt which rotates in the endless track and the expansion chamber which is located under the area supporting the steel sheet, and can provide air pressure through a hole or slit Includes, the conveyor belt may maintain the curved surface by the air pressure provided from the expansion chamber.
  • the steel sheet may be provided in close contact with the conveyor belt to have the same curvature as the curved surface of the conveyor belt.
  • the distance between the respective ink heads and the steel sheet may be provided in the same manner.
  • the distance between the respective ink heads and the steel sheet may be maintained in the range of 0.8 mm to 1.2 mm.
  • the apparatus may further include a base frame configured to constrain the plurality of ink heads with a single device, the base frame having a first opening for exposing the nozzles of the ink head, wherein the base frame is located in front of the ink head (the steel sheet approaches).
  • a base frame configured to constrain the plurality of ink heads with a single device, the base frame having a first opening for exposing the nozzles of the ink head, wherein the base frame is located in front of the ink head (the steel sheet approaches).
  • Direction and both sides of the coated steel sheet manufacturing apparatus may be provided.
  • the base frame may further include a coupling plate having a third opening for receiving the ink head, and fixing the ink head to the third opening.
  • the base frame is provided to extend laterally in front of, behind, and both sides of the ink head, thereby preventing occurrence of non-uniform flow around the ink head.
  • a plurality of the ink heads may be arranged in parallel in the width direction of the steel sheet, and may be disposed to partially overlap in the length direction of the steel sheet.
  • the first auxiliary plate may be further provided to fill a space between the inkhead positioned in front and the inkhead positioned in the rear.
  • the coupling plate may further include a second auxiliary plate disposed to be recessed from the base frame and installed to fill a space between the ink head and the base frame.
  • the apparatus may further include an auxiliary plate that fills a space between the ink head and the base frame, but is installed so as not to protrude from the ink head.
  • an ink head positioned most forward of the plurality of ink heads may be disposed at least a minimum development flow distance L1 from a front end of the base frame.
  • the ink head is provided to protrude below the base frame, the base frame may extend beyond the minimum development flow distance (L2) to the front of the ink head.
  • the ink head is provided to be recessed above the base frame, and the base frame may extend beyond the minimum development flow distance L3 to the front of the ink head.
  • the distance between the respective ink heads and the steel sheet may be maintained in the range of 0.8 mm to 1.2 mm.
  • a printing apparatus for printing by using inkjet printing on the surface of the steel sheet is disposed in the advancing direction of the steel sheet on the printing area, is disposed in the width direction of the steel sheet
  • the base frame extends laterally on both sides in front of the ink head (the direction in which the steel sheet approaches), and the nozzle portion of the ink head protrudes downward from an end portion and is provided at an end portion of the ink head. It is possible to provide an apparatus for manufacturing a coated steel sheet including a first auxiliary plate to fill a space around the nozzle unit.
  • the display apparatus may further include a second auxiliary plate that fills a space between the base frame and the ink head and is installed so as not to protrude downward from the nozzle unit.
  • Apparatus for producing a coated steel sheet using inkjet printing is capable of producing a continuous coil process.
  • the process is simple and the production speed and efficiency are high.
  • a plurality of ink heads are disposed in the width direction of the steel sheet, thereby preventing the occurrence of deterioration in image quality due to the flow in the width direction.
  • the speed control device can be used to supply the steel sheet at a constant speed so that the ink falls to the exact position required.
  • the steel sheet is kept flat in the printing area without remaining waves, thereby maintaining a constant distance between the ink head and the steel sheet, and preventing the steel sheet from impacting the head and causing breakage.
  • the distance between the ink head and the steel sheet can be controlled by using a steel sheet upper gap adjusting unit.
  • a base frame or dummy inkhead may be used to prevent the occurrence of uneven flow that may affect the inkhead.
  • FIG. 1 is a view schematically showing an apparatus for manufacturing a coated steel sheet according to a first embodiment of the present invention.
  • FIG. 2 is a view showing a state that the upper layer line is not used in the manufacturing apparatus of the coated steel sheet.
  • FIG 3 is a view showing a state using the upper layer line in the manufacturing apparatus of the coated steel sheet, but not using a printing apparatus.
  • FIG. 4 is an enlarged side view showing a difference in dropping points of ink according to the influence of ambient airflow.
  • FIG 5 is a side view showing a printing unit according to a first embodiment of the present invention.
  • FIG. 6 is a bottom view of the printing unit according to the first embodiment of the present invention.
  • FIG. 7 is an enlarged side view illustrating a printing unit according to a second exemplary embodiment of the present invention.
  • FIG. 8 is a structural diagram illustrating a close transfer unit according to a first embodiment of the present invention.
  • FIG. 9 is a structural diagram illustrating a close transfer unit according to a second embodiment of the present invention.
  • 10 is a graph showing the relationship between the radius of curvature and the maximum height difference of the close transfer unit.
  • FIG. 11 is a view schematically showing an apparatus for manufacturing a coated steel sheet according to a second embodiment of the present invention.
  • FIG. 12 is a side view showing the height adjustment unit according to an embodiment of the present invention.
  • Figure 13 is an enlarged view showing the state before the steel sheet passes through the digging adjustment unit.
  • 15 is a graph showing a wave of the steel sheet is changed while passing through the height adjustment unit.
  • 16 is a perspective view from below of the printing unit according to the third embodiment of the present invention.
  • 17 is a side cross-sectional view of a printing unit according to a third embodiment of the present invention.
  • FIG. 18 is a bottom view of a printing unit according to a third embodiment of the present invention.
  • 19 is a side view showing a drop point of the ink droplets in accordance with the influence of the surrounding airflow when there is no base frame.
  • 20 is a side view showing the dropping point of the ink droplets in the third embodiment of the present invention.
  • 21 is a photograph showing print quality according to the distance between the steel sheet and the ink head.
  • 22 is a graph showing the minimum development flow distance according to the distance between the steel sheet and the ink head.
  • 24 is a graph showing the minimum development flow distance according to the traveling speed of the steel sheet.
  • Fig. 25 is a side cross-sectional view showing an enlarged combination of ink heads.
  • Fig. 26 is a view showing the airflow of the printing unit according to the third embodiment.
  • 27 is a photograph showing print quality according to height difference.
  • Fig. 28 is a graph showing the ink side velocity according to the advancing speed of the steel sheet.
  • 29 is a perspective view illustrating a state in which a first auxiliary plate is installed.
  • FIG. 30 is a graph showing the ink side velocity according to the advancing speed of the steel sheet after installing the first auxiliary plate.
  • FIG. 31 is a perspective view illustrating a state in which a second auxiliary plate is installed.
  • FIG. 32 is a perspective view illustrating a state in which the first and second auxiliary plates are installed.
  • FIG. 33 is a side cross-sectional view of FIG. 32.
  • FIG. 1 is a view schematically showing an apparatus for manufacturing a coated steel sheet according to a first embodiment of the present invention.
  • the steel sheet may go through a process of forming a coating layer before entering the printing process. That is, the apparatus for manufacturing a coated steel sheet may include forming a coating layer and forming a printing layer on the coating layer by using inkjet printing.
  • the coated steel sheet means a steel sheet on which a coating layer or a printed layer is formed.
  • the apparatus for manufacturing coated steel sheet includes a tension control device 10 for applying tension to keep the steel sheet flat and not bent, and a meandering control device for preventing the steel sheet from shifting from side to side without moving along the center of the production line. (20), speed control devices 30 and 40 for maintaining the advancing speed of the steel sheet so that the ink falls precisely to the required position when the printing ink is dropped on the steel sheet, and printing the pattern or color by dropping the printing ink on the steel sheet. It may include a printing apparatus 100.
  • the tension control device 10 the meander control device 20, the deflector roll 51 (Deflector Roll), the dancer roll 53 (Dancer Roll), the speed control device 30 from the entry direction of the steel sheet
  • the printing apparatus 100, the deflector roll 52, and the speed controller 40 may be continuously provided.
  • the tension controller 10 may maintain the steel sheet within a set tension range by adjusting the speed and the contact angle of the tension bridle rolls 11 and 12 (TBR; TBR).
  • the tension range can be set within a range that makes the steel plate surface flat but does not cause breakage due to too much tension.
  • the tension range may be set within the range of 2 kgf / mm 2 to 4 kgf / mm 2.
  • the tension error of the steel sheet can be adjusted to be within the range of -1% to + 1% to maintain the tension of the steel sheet.
  • the tension bridle rolls 11, 12 may comprise two rolls arranged adjacently. And 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 the lower portion of the tension briddle roll 12 located in the advance direction (hereinafter referred to as the rear). Advance along the side. At this time, the magnitude 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 measuring sensor 13 for measuring the tension of the steel plate may be installed at the rear of the tension bridle roll (11, 12).
  • the tension measuring sensor 13 measures a tension of the steel sheet and transmits a signal to the tension control system 14.
  • the tension control system 14 transmits an operation signal to the tension briddle rolls 11 and 12 so as to lower the tension of the steel sheet when the tension of the steel sheet is measured above the set range, and the tension of the steel sheet is measured below the set range. In this case, the operation signal is transmitted to the tension bridle rolls 11 and 12 to increase the tension of the steel sheet.
  • the meandering control device 20 is configured to determine the steering rolls 21 and 22 (SR; Steering Roll) according to the meandering amount at which the center position of the steel sheet in the width direction indicated by the meander measuring sensor 23 is out of the center of the steel sheet conveying line.
  • the axis can be rotated and moved.
  • the meandering amount of the steel sheet may be managed within a range of ⁇ 1 mm to +1 mm.
  • the steering rolls 21, 22 may be located behind the tension bridle rolls 11, 12.
  • the steering rolls 21 and 22 may include two rolls arranged adjacently. And the steel sheet can be conveyed along the upper surface of two adjacent rolls. At this time, the meandering of the steel plate can be controlled by changing the steel plate width direction position (or the steel plate width direction inclination of the rotating shaft) of any of the steering rolls 21 and 22.
  • a meander measuring sensor 23 for measuring the meandering of the steel sheet may be installed at the rear of the steering roll (21, 22).
  • the meander measuring sensor 23 measures the meandering of the steel sheet and transmits a signal to the meandering control system 24.
  • the meander control system 24 transmits an operation signal to the steering rolls 21 and 22 to move the steel plate to the left side when the steel plate meanders to the right side, and to move the steel plate to the right side when the steel plate meanders to the left side.
  • the operation signal is transmitted to the rolls 21 and 22.
  • the meander measuring sensor 23 may also be connected to the printing apparatus 100. For example, when the degree of meandering of the steel sheet exceeds the dangerous range, the printing apparatus 100 may stop the operation.
  • the speed controllers 30 and 40 may adjust the rotational speed of the pinch rolls 31 and 41 (PR; Pinch Roll) to maintain the traveling direction speed of the steel sheet at the set speed. This is because the printing ink may fall to a desired position only when the speed of the steel sheet is kept constant.
  • the set speed of the steel sheet may be selected within the range of 30 mpm to 50 mpm.
  • the amount of change in the actual running speed of the steel sheet can be managed within the range of -25 ⁇ m / sec to +25 ⁇ m / sec.
  • the pinch rolls 31 and 41 may include two rolls arranged above and below the steel sheet. At this time, the traveling speed of the steel sheet can be adjusted by changing the rotational speed of any one or more of the pinch rolls 31 and 41.
  • the pinch rolls 31 and 41 can reduce the width direction vibration, fixing the movement to the width direction of a steel plate.
  • the pinch rolls 31 and 41 are adjusted so that the horizontal vibration width of the steel sheet is kept within the range of -11 ⁇ m to +11 ⁇ m.
  • the pinch rolls 31 and 41 may be installed at any one or more of the front and rear of the printing apparatus 100. In the figure, the pinch rolls 31 and 41 are installed at both the front and the rear of the printing apparatus 100. However, the pinch rolls 31 and 41 may be installed only at the rear of the printing apparatus 100 to control the speed while pulling the steel sheet, or may be installed only at the front of the printing apparatus 100 to control the speed while pushing the steel sheet.
  • deflector rolls 51 and 52 can be used to change the advancing direction and angle of the steel sheet.
  • the meander control device 20 and the speed control device (30, 40) to change the direction of the steel sheet and is provided between the printing device 100 and the speed control device (30, 40) to change the direction of the steel sheet I can change it.
  • the dancer roll 53 is movable in the small range in the up-down direction of a steel plate by installing the vibration reduction member between the bases. Therefore, the dancer roll 53 can reduce the vibration of a steel plate, and can also adjust the tension of a steel plate. Specifically, the dancer roll 53 may reduce the vibration of the steel sheet generated while passing 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 sheet is maintained within -60 ⁇ m to +60 ⁇ m.
  • the printing apparatus 100 adjusts the up-and-down position of the close-up conveying unit 120 and the steel sheet is flat so that the steel sheet is unfolded flat in the jetting zone (Jetting zone) or the printing area (A) where the ink is dropping Position adjustment unit of the steel plate supporting rolls (131, 132) and the printing unit 110 for dropping the printing ink on the steel sheet.
  • the close transfer unit 120 may bring the steel sheet into close contact with the conveyor belt 133 to flatten the surface of the steel sheet.
  • the flatness of the surface of the steel sheet was said to be achieved through the tension control device 10. But finely, the residual wave remains on the steel plate surface.
  • the steel sheet moving at a speed of 30 mpm to 50 mpm is used as the ink head 111. )
  • the printing apparatus 100 may be damaged. Therefore, the residual wave is removed using a separate close transfer unit 120.
  • the position adjusting unit of the steel plate supporting rolls 131 and 132 adjusts the vertical position of the steel plate supporting rolls 131 and 132 for controlling the up and down position of the designated steel sheet while supporting the steel sheet so that printing ink falls on the correct position of the steel sheet. You can do that.
  • the steel plate support rolls 131 and 132 may adjust the position of the steel plate support rolls 131 and 132 such that the vertical vibration width of the steel plate is maintained within -60 ⁇ m to +60 ⁇ m.
  • the printing unit 110 may execute printing design on the surface of the steel sheet by spraying printing ink on the steel sheet moving in the printing area A. FIG. This will be described later in detail.
  • Figure 3 is a view showing a state in which the upper layer line is used in the manufacturing apparatus of the coated steel sheet but does not use the printing apparatus 100.
  • Apparatus for manufacturing a coated steel sheet according to an embodiment of the present invention may be provided with a multilayer line including a lower layer line and an upper layer line.
  • the tension control device 10, the meander control device 20, the speed control device (30, 40), the printing device 100, and the like described above may be provided in the upper layer line. That is, in the upper layer line, a preparatory process for printing on a steel sheet, a process of printing using inkjet printing, and a process for improving print quality may be performed.
  • the process performed in the lower layer line before entering the upper layer line is referred to as a pre-process
  • the process after completion of printing on the steel sheet is referred to as the post-process.
  • the preceding and subsequent steps are not shown in the drawings, and a separate description is omitted.
  • the upper line includes a structure disposed on the lower line, and the respective devices may be disposed in the structure.
  • the printing structure 73 in which the printing apparatus 100 is disposed may be provided independently of the front structure 71 positioned in the front and the rear structure 72 positioned in the rear.
  • the tension control device 10, the meander control device 20, and the first speed control device 30 may be provided on the front structure 71, and the second speed control device may be provided on the rear structure 72. 40 may be provided.
  • front structure 71 and the rear structure 72 may be integrally formed to form an upper structure, and the printing structure 73 may be independently installed in an opening formed in the upper structure.
  • tension control device 10 and the meandering control device 20 installed on the front structure 71 have a separate driving force, they generate vibration while operating and cause a speed error of the steel sheet. If the printing apparatus 100 is installed together with them on the front structure 71, high resolution and high printability may not be achieved due to vibration and speed errors occurring in the structure.
  • the ink head 111 and the close transfer unit 120 is very vulnerable to vibration. Since the distance between the ink head 111 and the steel sheet may be provided in a range of 0.8 mm to 1.2 mm, if a vibration occurs in the ink head 111 and the close transfer unit 120, an error in the printed image of the product required May occur, and in severe cases, may cause damage to the ink head 111. Therefore, the printing apparatus 100 may be installed in the printing structure 73 provided independently of the front structure 71.
  • Steel plate moving direction control device 60 may be installed in the lower layer line.
  • the steel plate moving direction control device 60 may include a fixed roll 61 and moving rolls 62 and 63.
  • the moving roll is in contact with the rear of the fixed roll 61, the first moving roll 62 to change the advancing direction of the steel sheet to the upper portion to enter the upper layer line, and the steel roll is in contact with the lower portion of the fixed roll 61
  • It may include a second moving roll 63 to pass to the lower line without moving to the line.
  • Each of the first moving roll 62 and the second moving roll 63 may be provided to move in contact with or not in contact with the fixed roll 61.
  • first moving roll 62 and the second moving roll 63 may be installed so as to change the position where one moving roll is in contact with the fixed roll 61.
  • a plurality of cylinders and joints can be used to move the position of the moving roll.
  • the moving roll 62 may be moved below the fixing roll 61.
  • the tension control device 10 is installed above the steel plate moving direction control device 60 so that the steel sheet passing through the steel plate moving direction control device 60 may directly enter the tension control device 10.
  • the feed height of the steel sheet can be adjusted by adjusting the vertical position of the pair of pinch rolls 31 and 41 located in front and rear of the printing apparatus 100.
  • the ink head 111 of the printing apparatus 100 may be moved upward so that the ink head 111 and the close transfer unit 120 may be separated from each other.
  • the steel sheet is not in the close contact with the ink head 111 but is in close contact with the transfer unit 120. Can pass without contact. Therefore, the steel sheet can be transferred to the next process of the upper layer line without going through the printing process.
  • FIG. 4 is an enlarged side view showing a difference in dropping points of ink according to the influence of ambient airflow.
  • the steel sheet passes at a relatively high speed, producing a constant airflow around the steel sheet. Therefore, the ink dripping from the nozzle 3 does not fall vertically but moves in the advancing direction of the steel sheet to fall. However, if a uniform air flow is formed in each of the ink heads 1, the quality of the printed image is not affected. However, there is a fear that the printed image may be distorted when nonuniform flow occurs in any one of the ink heads 1.
  • Non-uniform flow may occur around the ink head 1.
  • the nonuniform flow changes the drop point of the ink, causing deterioration of the printed image. Assuming that there is one ink head 1, the uneven flow of the front of the ink head 1 and both sides of the ink head 1 may degrade the outer quality of the printed image. However, the rear of the ink head 1 is less likely to cause uneven flow due to the influence of airflow formed by the steel sheet.
  • the dropping point of the ink may vary due to the influence of the surrounding airflow on the frontmost ink head 1.
  • the ink head 1 located relatively inward is less affected by the ambient airflow.
  • the ink head 1 located at the rearmost side is also less likely to cause uneven flow due to the influence of airflow formed by the steel sheet.
  • FIG 5 is a side view showing the printing unit 110 according to the first embodiment of the present invention.
  • the printing unit 110 includes an ink head 111 on which a nozzle 112 for spraying printing ink is mounted, and hardening the ink so that ink dropped on the steel sheet does not become more than an appropriate spreading amount.
  • Apparatus 113 and ink supply device 114 that can continuously supply ink without bubbles.
  • the ink head 111 may be provided with a plurality of nozzles 112 disposed to face down, and the plurality of nozzles 112 may be arranged side by side in the width direction of the steel sheet, and may be disposed at uniform intervals.
  • the ink supply device 114 may be connected to the ink head 111, and may be coupled to the ink head 111 so that the ink supply device 114 may be detachably attached to the ink head 111.
  • a plurality of ink heads 111 may be arranged side by side in the advancing direction of the steel sheet. At this time, each of the ink heads 111 arranged in the advancing direction of the steel sheet may spray ink of different colors.
  • ink heads 111 for spraying C (Cyan), M (Magenta), Y (Yellow), and K (Black) colors from the front of the steel sheet may be disposed side by side.
  • the ink head 111 spraying ink having one color may be disposed to overlap the plurality of ink heads 111 in the width direction of the steel sheet. If the length of the ink head 111 is sufficient to cover the width length of the steel sheet, one ink head 111 may play one color, but the length of the ink head 111 is the width length of the steel sheet. When smaller, the plurality of ink heads 111 can be used by connecting in the width direction of the steel sheet.
  • two ink heads 111 are arranged side by side in the width direction of the steel sheet.
  • the ink head 111 may be disposed to partially overlap, but the nozzles 112 may be disposed not to overlap. More specifically, the nozzle between the position of the left outermost nozzle 112 of the ink head 111 located on the left side and the right outermost nozzle 112 of the ink head 111 located on the right side are adjacent to each other. It may be arranged to coincide with the interval between the 112.
  • the curing apparatus 113 may cure the ink using ultraviolet (UV). Ink droplets (Droplet) sprayed on the steel sheet can continue to spread over time. However, the larger the ink droplet size, the lower the resolution of the printed image. Therefore, the curing apparatus 113 may harden the ink so that the ink is not more than the proper spreading amount.
  • UV ultraviolet
  • the curing apparatus 113 may be disposed behind the ink head 111.
  • the curing apparatus 113 may be disposed behind the ink head 111 in charge of one color.
  • the K-color ink head 111, and the curing apparatus 113 may be arranged side by side.
  • 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. If the distance between the steel sheet and the nozzle 112 is greater than 1.2 mm, it is difficult to precisely control the position of the ink drop, the quality of the printed image is reduced by that. This is because the ink falls on the steel plate moving at a high speed and is affected by the surrounding airflow while falling. In addition, when the distance between the steel sheet and the nozzle 112 is smaller than 0.8 mm, there is a possibility that the steel sheet impacts the ink head 111. This is because the steel sheet does not have a perfect flat surface and contains a fine wave, so a safety distance is required between the steel sheet and the ink head 111.
  • FIG. 6 is a bottom view of the printing unit 110 according to the first embodiment of the present invention.
  • the printing unit 110 may include a base frame 115 for fixing the ink head 111 and the curing apparatus 113.
  • the base frame 115 may constrain the plurality of ink heads 111 and the plurality of curing devices 113 into one device.
  • the base frame 115 may be disposed to cross the plurality of ink heads 111 and the plurality of curing devices 113.
  • the base frame 115 may form a first opening 115a exposing the nozzle 112 of the ink head 111 and a second opening 115b exposing the irradiation part of the curing apparatus 113.
  • the base frame 115 may ensure a uniform flow field in the printing area A by securing a flow development distance so that the ink droplets may correctly fall to a target position.
  • the bottom of the base frame 115 may be located below the ink head 111.
  • the bottom surface of the base frame 115 may be located at the bottom in a range that does not go down below the position of the nozzle 112.
  • the base frame 115 can prevent the dropping point of the ink from being changed by the airflow around the nozzle 112. That is, the base frame 115 may be provided to extend a predetermined distance in both sides of the front and rear of the nozzle 112 so that uniform flow may be formed in the printing area A.
  • the printing area A means an area where the nozzle 112 is located or an area where a printing image is formed due to ink dropping off.
  • FIG. 7 is an enlarged side view illustrating the printing unit 110-1 according to the second embodiment of the present invention.
  • a dummy unit may be disposed in front of the ink head 111 positioned at the most front.
  • the dummy unit is installed in front of the ink head 111 located at the most front to make the same condition as the ink head 111 located from the second, but does not function positively.
  • the dummy unit can ensure a uniform flow field in the printing area A so that the ink droplets can accurately fall to the target position.
  • the dummy unit may include a dummy ink head 116 and a dummy curing device 117.
  • the dummy ink head 116, the dummy curing device 117, the C ink head 111, the curing device 113, the M ink head 111 and the curing device 113 in the traveling direction of the steel sheet.
  • the Y-color ink head 111, the curing apparatus 113, the K-color ink head 111, and the curing apparatus 113 may be arranged side by side.
  • the dummy ink head 116 and the dummy curing apparatus 117 have the same peripheral conditions as those of the ink head 111 located at the second or less than the peripheral conditions of the C color ink head 111 located at the most front.
  • the influence of the airflow on the ink head 111 can be made the same.
  • the dummy unit may be used when it is difficult to install the base frame 115 shown in FIG.
  • the ink heads 111 should also be arranged at the same curvature. This is because the distance between the steel sheet and the ink head 111 should be constant.
  • the dummy unit can be installed in front of the ink head 111 located at the most forward.
  • FIG. 8 is a structural diagram illustrating the close transfer unit 120 according to the first embodiment of the present invention.
  • the close transfer unit 120 is formed of steel sheet support rolls 131 and 132 for supporting the steel sheets in front and rear of the steel sheet, a conveyor belt 133 which moves together with the steel sheets while rotating, and a vacuum pressure for adsorbing the steel sheets.
  • the vacuum chamber 134 and the pump 135 to provide a vacuum pressure may be included.
  • the steel sheet support rolls 131 and 132 may be provided integrally with the conveyor support roll for supporting the conveyor belt 133.
  • the conveyor belt 133 may be disposed to surround the plurality of steel plate supporting rolls 131 and 132, and may form an endless track. And the steel sheet is supported on the conveyor belt 133 may move with the conveyor belt 133.
  • the conveyor belt 133 may be provided to be able to deform the shape. Therefore, even when the rotational track is not circular, continuous rotational movement is possible. And the steel sheet support roll 131 located in front of the conveyor belt 133 and the steel sheet support roll 132 located in the rear apply a tension to the conveyor belt 133, the conveyor belt ( 133 may be kept flat. However, because the fine wave is present in the steel sheet entering the close transfer unit 120, even if the conveyor belt 133 is kept flat, there is a fear that a gap occurs with the conveyor belt 133.
  • the close transfer unit 120 may form a vacuum pressure on the conveyor belt 133 to closely adhere the steel plate to the conveyor belt 133.
  • a vacuum chamber 134 may be provided in the inner space of the conveyor belt 133, and the vacuum chamber 134 may be connected to the pump 135 to form a vacuum pressure.
  • the conveyor belt 133 may form a plurality of vacuum holes or vacuum slits so that the vacuum pressure may act on the steel sheet. That is, the vacuum pressure formed in the vacuum chamber 134 acts on the steel sheet through the vacuum hole or the vacuum slit to adsorb the steel sheet. Therefore, the steel sheet may be brought into close contact with the conveyor belt 133 and flattened.
  • FIG. 9 is a structural diagram illustrating the close transfer unit 120-1 according to the second embodiment of the present invention.
  • the close conveyance unit 120-1 includes steel sheet support rolls 131 and 132 for supporting the steel sheets in front and rear of the steel sheet, a conveyor belt 133 which moves together with the steel sheet while rotating, and presses the steel sheet to the conveyor belt.
  • Steel plate press rolls 136 and 137 in close contact with 133, an expansion chamber 138 that expands the conveyor belt 133 to form a curved surface, and a pump 135 that provides an expansion pressure.
  • the steel sheet support rolls 131 and 132 may be provided integrally with the conveyor support roll for supporting the conveyor belt 133.
  • the conveyor belt 133 may be disposed to surround the plurality of steel plate supporting rolls 131 and 132, and may form an endless track. And the steel sheet is supported on the conveyor belt 133 may move with the conveyor belt 133.
  • the conveyor belt 133 may be provided to be able to deform the shape. Therefore, even when the rotational track is not circular, continuous rotational movement is possible.
  • the conveyor belt 133 may provide a convex curved surface. At this time, the curved surface of the conveyor belt 133 may have a constant radius of curvature.
  • the steel plate pressing rolls 136 and 137 may press the steel sheet at the front and the rear of the conveyor belt 133 so that the steel sheet is in close contact with the conveyor belt 133. Therefore, when the conveyor belt 133 forms a convex curved surface, the steel sheet also closely contacts the conveyor belt 133 to form a convex curved surface.
  • the distance between the steel sheet and the ink head 111 since the distance between the steel sheet and the ink head 111 is close, the distance between the steel sheet and the ink head 111 should be constant. Therefore, when the ink head 111 is disposed at the same curvature as the curvature of the steel sheet, the distance between the steel sheet and the ink head 111 may be kept constant while the steel sheet is provided with a convex curved surface.
  • One way to convex the shape of the conveyor belt 133 is to install a base having a convex shape under the conveyor belt 133, and to allow the conveyor belt 133 to slide and move on the surface of the base. have.
  • continuous friction exists between the stationary base and the conveyor belt 133 in the moving state, which may cause problems in noise and durability.
  • the close conveyance unit 120-1 is provided with an expansion chamber 138 having a convex shape under the conveyor belt 133, a plurality of surfaces on the surface of the expansion chamber 138 It may form a hole or a slit, and may provide air pressure through the pump 135 connected to the expansion chamber 138. That is, the air pressure formed in the expansion chamber 138 may act on the conveyor belt 133 through a hole or slit of the expansion chamber 138 to float the conveyor belt 133. Therefore, the conveyor belt 133 may rotate while being kept at a distance from the expansion chamber 138 to remove friction. For example, the distance between the conveyor belt 133 and the expansion chamber 138 pushed up by the expansion chamber 138 may maintain 10 ⁇ m to 50 ⁇ m.
  • the curvature of the conveyor belt 133 is related to the magnitude of the tension additionally provided to the steel sheet. That is, the larger the curvature of the conveyor belt 133, the greater the magnitude of the tension additionally provided to the steel sheet.
  • the close transfer unit 120-1 may determine the curvature of the conveyor belt 133 to add a tension within 0.2% to 1.0% of the tension applied to the steel sheet.
  • the length of the steel sheet provided as a curved surface in the printing area (A) is to be provided to increase within 0.2% to 1.0% than the length when the steel sheet is arranged flat in the printing area (A), depending on the conveyor
  • the radius of curvature of the belt 133 may be determined.
  • the straight length of the printed area A when the steel sheet is provided flat is the length of the string crossing the arc. Therefore, the radius of curvature can be found in the range in which the length of the arc increases within 0.2% to 1.0% of the length of the string.
  • the radius of curvature may be provided within a range of 5,000 mm to 5,500 mm.
  • 10 is a graph showing the relationship between the radius of curvature of the close transfer unit 120 and the maximum height difference.
  • the horizontal axis represents the radius of curvature of the conveyor belt 133
  • the vertical axis represents the height of the central portion of the steel sheet provided in the curved surface. That is, as the radius of curvature of the conveyor belt 133 increases, the height of the center portion of the steel sheet decreases, and the two are in quadratic relation.
  • the graph shows the radius of curvature and the maximum height when the length of the printing area A is 3,000 mm.
  • the central portion of the steel sheet rises in the range of 150 mm to 250 mm.
  • FIG. 11 is a view schematically showing an apparatus for manufacturing a coated steel sheet according to a second embodiment of the present invention.
  • the manufacturing apparatus of the coated steel sheet according to the second embodiment of the present invention may further include a crest control unit 140 to reduce the crest of the steel sheet by plastically deforming the steel sheet before the steel sheet enters the printing apparatus 100.
  • Digging means the height of the highest point in the wave of the steel sheet.
  • FIG. 12 is a side view showing the height adjustment unit 140 according to an embodiment of the present invention.
  • the height adjustment unit 140 may be disposed in front of the printing apparatus 100, and includes a height adjustment rolls 141 and 142 that reduce the height of the steel sheet and a height measurement sensor 143 for measuring the height of the steel sheet. can do.
  • the digging adjustment rolls 141 and 142 may include a pair of rolls disposed up and down with a steel plate interposed therebetween, and two or more of the digging adjustment rolls 141 and 142 may be continuously disposed in a traveling direction of the steel sheet. And the pair of height adjustment rolls (141, 142) may be arranged to contact the upper and lower surfaces of the steel sheet, respectively. Alternatively, the pair of crest adjustment rolls 141 and 142 may be disposed apart by a distance of a set crest aimed at by the crest control unit 140. In addition, the digging adjustment rolls (141, 142) is provided to be able to move in the horizontal direction can adjust the interval between the pair of wave adjusting rollers (141, 142).
  • the crest measuring sensor 143 is disposed at the rear of the crest adjusting rolls 141 and 142 to measure the crest of the steel sheet, and when it is detected that the crest of the steel sheet measured from the crest measuring sensor 143 is greater than or equal to a predetermined range, the continuous process of the steel sheet. Can be stopped.
  • the crest measurement sensor 143 may be disposed away from one surface of the steel sheet, and may send a signal toward the steel sheet and recover the crest to measure the crest of the steel sheet.
  • the crest measuring sensor 143 may be disposed away from the steel sheet by a distance of the crest set by the crest adjusting oil 140. Therefore, when the steel sheet is dug and adhered to the measuring sensor 143, the ink head 111 may be damaged, and thus the continuous process of the steel sheet may be stopped.
  • FIG. 13 is an enlarged view showing the state before the steel plate passes through the digging control unit 140
  • FIG. 14 is an enlarged view showing the state after the steel plate passes through the digging control unit 140
  • Figure 15 is a graph showing a state of changing the wave of the steel sheet while passing through the height adjustment unit 140.
  • the direction of the crest can be changed to a convex wave downward while passing through the crest adjustment rolls (141, 142).
  • the digging adjustment rolls (141, 142) After passing through the digging adjustment rolls (141, 142) it is returned to the wave in the original direction by the spring back phenomenon.
  • plastic deformation occurs in this process, so that the height of the digging becomes smaller than the digging before passing the digging adjustment rolls (141, 142).
  • the original crest is not large, the degree of plastic deformation is reduced, and thus the direction of the wave may not be changed even after passing the crest control rolls 141 and 142.
  • the case where the steel sheet has a crest of 3 mm before passing through the crest control unit 140 is taken as an example.
  • the steel sheet has a crest of -1.67 mm while passing through the first crest control roll 141. That is, it has a crest of 1.67 mm concave downward.
  • the wave returns to its original state by the spring back phenomenon and has a wave height of 1.0 mm convex upward.
  • passing the second digging adjustment roll 142 will have a digging of 0.2 mm.
  • the direction of the wave did not change as when passing through the first height adjustment roll 141.
  • the digging is increased by the spring back phenomenon, and as a result, the steel sheet has a digging of 0.5 mm while passing through two digging adjustment rolls (141, 142).
  • the flap, the setting of the height adjustment unit 140 may be set in the range of 80% or less of the gap between the ink head 111 and the steel sheet. Therefore, when the crest measuring sensor 143 measures that the crest of the steel sheet exceeds the set crest, the continuous process of the steel sheet can be stopped.
  • FIG. 16 is a perspective view from below of the printing unit 110-2 according to the third embodiment of the present invention.
  • 17 is a side cross-sectional view of the printing unit 110-2 according to the third embodiment of the present invention
  • FIG. 18 is a bottom view of the printing unit 110-2 according to the third embodiment of the present invention.
  • the printing unit 110-2 includes an ink head 111 on which a nozzle 112 for spraying printing ink is mounted, and a curing device 113 for solidifying ink so that ink dropped on a steel sheet does not exceed an appropriate spreading amount. And an ink supply device 114 capable of continuously supplying ink without bubbles.
  • the ink head 111 may be provided with a plurality of nozzles 112 disposed to face down, and the plurality of nozzles 112 may be arranged side by side in the width direction of the steel sheet, and may be disposed at uniform intervals.
  • the nozzles 112 should be arranged at regular intervals to obtain uniform print quality.
  • the ink supply device 114 may be connected to the ink head 111 to supply ink to the nozzles 112, and the ink supply device 114 may be coupled to the ink head 111 so as to be detachable and replaceable when the ink is insufficient.
  • a plurality of ink heads 111 may be arranged side by side in the advancing direction of the steel sheet. At this time, each of the ink heads 111 arranged in the advancing direction of the steel sheet may spray ink of different colors.
  • ink heads 111 for spraying C (Cyan), M (Magenta), Y (Yellow), and K (Black) colors from the front of the steel sheet may be disposed side by side.
  • a plurality of ink heads 111 11-1 and 111-2 may be disposed in the width direction of the steel sheet. If the length of the ink head 111 is sufficient to cover the width width of the steel sheet, one ink head 111 may be sufficient to cover one color, but the length of the ink head 111 is When the width is smaller than the width, the plurality of ink heads 111 can be used by connecting in the width direction of the steel sheet.
  • two ink heads 111-1 and 111-2 may be arranged side by side (parallel) in the width direction of the steel sheet.
  • the two ink heads 111 include an ink head 111-1 positioned forward in the advancing direction of the steel sheet and an ink head 111-2 positioned rearward.
  • the nozzle 112 includes a nozzle 112-1 positioned forward in the advancing direction of the steel plate and a nozzle 112-2 positioned rearward.
  • three or more ink heads 111 may be arranged side by side in the width direction of the steel sheet.
  • the ink heads 111 arranged side by side may be arranged to partially overlap each other in the advancing direction of the steel sheet.
  • the outermost nozzle 112 of each ink head 111 may be disposed so as not to overlap in the advancing direction of the steel sheet. More specifically, the distance between the position of the right outermost nozzle 112 of the ink head 111 located on the left side and the left outermost nozzle 112 of the ink head 111 located on the right side is one ink. It may be arranged to coincide with the spacing between adjacent nozzles 112 in the head 111. Therefore, the nozzles 112 arranged in the width direction of the steel sheet may be provided at regular intervals.
  • the curing apparatus 113 may cure the ink using ultraviolet (UV). Ink droplets (Droplet) sprayed on the steel sheet can continue to spread over time. However, the larger the ink droplet size, the lower the resolution of the printed image. Therefore, the curing apparatus 113 may harden the ink so that the ink is not more than the proper spreading amount.
  • UV ultraviolet
  • the curing apparatus 113 may be disposed behind the ink head 111.
  • the curing apparatus 113 may be disposed behind the ink head 111 in charge of one color.
  • the K-color ink head 111, and the curing apparatus 113 may be arranged side by side.
  • the distance between the ink heads 111, the distance between the curing apparatuses 113, and the distance between the adjacent ink heads 111 and the curing apparatus 113 may be uniformly provided. Therefore, the degree to which each color is cured can be made uniform.
  • 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. If the distance between the steel sheet and the nozzle 112 is greater than 1.2 mm, it is difficult to precisely control the position of the ink drop, the quality of the printed image is reduced by that. This is because the ink falls on the steel plate moving at a high speed and is affected by the surrounding airflow while falling.
  • the distance between the steel sheet and the nozzle 112 is smaller than 0.8 mm, there is a possibility that the steel sheet impacts the ink head 111. Since the steel sheet is not provided in a perfect plane and contains fine waves, a safety distance is required between the steel sheet and the ink head 111.
  • the printing unit 110-2 may include a base frame 115 for fixing the ink head 111 and the curing apparatus 113.
  • the base frame 115 may constrain the plurality of ink heads 111 and the plurality of curing devices 113 into one device.
  • the base frame 115 may extend in the advancing direction of the steel sheet to combine the plurality of ink heads 111 and the plurality of curing devices 113.
  • one base frame 115 combines the ink heads 111 and the curing apparatus 113 into one unit, a plurality of base frames 115 may be provided for each color. have.
  • the base frame 115 may form a first opening 115a for receiving the ink head 111 and a second opening 115b for exposing the irradiating portion of the curing apparatus 113.
  • the first opening 115a of the base frame 115 may be provided to a size sufficient to accommodate the ink heads 111 arranged in the width direction of the steel sheet.
  • the irradiation part of the curing apparatus 113 may be in a state of entering 2 mm into the second opening 115b.
  • the base frame 115 may further include a coupling plate 150 that fixes the plurality of ink heads 111 received in the first opening 115a to the base frame 115.
  • the ink head 111 may be fixed to the coupling plate 150, and the coupling plate 150 may be coupled to the base frame 115.
  • the coupling plate 150 may be manufactured separately according to the size and arrangement of the ink head 111. By using the coupling plate 150 manufactured separately, the ink head 111 of various sizes can be used, and the arrangement of the ink head 111 can be changed. In addition, it is possible to precisely arrange the nozzle 112 of the ink head 111 by customizing the coupling plate 150.
  • the assembly and disassembly of the ink head 111 can be facilitated.
  • the coupling plate 150 and the ink head 111 may be separated. If the ink head 111 is directly coupled to the base frame 115, it may be difficult to assemble and disassemble the ink head 111.
  • the coupling plate 150 may be coupled to the upper surface of the base frame 115.
  • a seating surface 115c on which the coupling plate 150 is seated is provided around the first opening 115a of the base frame 115, and the coupling plate 150 is seated on the mounting surface 115c. It can be fixed using a bolt (not shown).
  • the coupling plate 150 is coupled to the base frame 115 while the ink head 111 is fixed to the coupling plate 150.
  • a gap may occur and a height deviation may occur between the coupling portion of the base frame 115 and the coupling plate 150 or the coupling portion of the coupling plate 150 and the ink head 111.
  • the coupling portion may be sealed through a material having elasticity, for example, a rubber ring or the like. Elastic materials such as rubber can fill gaps and compensate for height variations.
  • 19 is a side view showing the dropping point of the ink droplets due to the influence of the ambient airflow when the base frame 115 is absent.
  • the steel sheet passes at a relatively high speed, producing a constant air flow (flow field) around the steel sheet. Therefore, the ink droplets falling from the nozzle 112 do not fall vertically but move in the advancing direction of the steel sheet to fall.
  • the uniform flow field formed in the moving direction of the steel sheet around the ink head 111 does not affect the quality of the printed image. However, even if a non-uniform flow occurs around one of the ink heads 111, or even a uniform flow, if the flow field is formed in the width direction of the steel sheet there is a fear that the printed image is distorted.
  • Non-uniform flow may occur around the ink head 111.
  • the nonuniform flow changes the drop point of the ink, causing deterioration of the printed image.
  • the inkhead 111 located at the most front is affected by the front airflow, and both sides of the inkhead 111 are likely to fall due to the influence of ambient airflow, resulting in the drop of ink droplets under uneven flow.
  • the ink heads 111 positioned in the rear may drop ink droplets in a relatively uniform flow state.
  • 20 is a side view showing the dropping point of the ink droplets in the third embodiment of the present invention.
  • the base frame 115 may ensure a uniform flow field in the printing area A by securing a flow development distance so that the ink droplets may accurately fall to a target position. That is, the base frame 115 is provided to extend a predetermined distance in front and to the side of the ink head 111 to secure a flow development distance in front of the ink head 111 located in the most front and both sides of the ink head 111. Thus, a uniform flow can be formed in the print area A.
  • the printing area A means an area where the nozzle 112 is located or an area where a printed image is formed by dropping ink droplets.
  • 21 is a photograph showing print quality according to the distance between the steel sheet and the ink head 111.
  • the uniform flow means that the flow field is constantly developed in all sections of the printing height.
  • 22 is a graph showing the minimum development flow distance according to the distance between the steel sheet and the ink head 111.
  • FIG. 22 is obtained through flow analysis.
  • the x axis represents the stand off between the nozzle 112 and the steel sheet, and the y axis represents the minimum development flow distance.
  • the printing conditions were the same with the sheet speed of 50 mpm, the ink ejection speed of 20 Khz, and the resolution of 600 dpi, and the print height was 0.7 mm, 1 mm, 1,5 mm, 2 mm, 2.7 mm, 3 mm, and 5 mm. Different.
  • the minimum flow development distance required for the case where the nozzle 112 enters the inside of the base frame 115 (200) and when the nozzle 112 protrudes 0.3 mm below the base frame 115 (201) And 200 mm inward (200) shows a shorter minimum flow development distance.
  • the minimum distance to which the first ink head 111 should be located from the inlet of the base frame 115 can be calculated according to the printing height.
  • the nozzle 112 of the inkhead 111 located at the most front should secure a distance greater than or equal to the minimum development flow distance L1 at the start end of the base frame 115, and minimum development.
  • the flow distance L1 may be derived from Equation 1 below.
  • the nozzle 112 of the ink head 111 in order to proceed printing under a uniform flow field. It is necessary to secure a distance of at least a minimum development flow distance L2 forward, and the minimum development flow distance L2 may be derived from Equation 2 below.
  • the nozzle 112 of the ink head 111 is in front of the nozzle 112.
  • the minimum development flow distance (L3) or more must be secured, the minimum development flow distance (L3) can be derived from the following equation (3).
  • the minimum developmental flow distances L2 and L3 derived from Equations 2 and 3 may be applied to the inkheads 111 positioned behind the inkhead 111 located at the most front, and may be applied to both front and rear sides. It can be applied to the side.
  • the width direction scattering phenomenon of the ink droplets is greatly increased by an angle of 31.67 degrees in the width direction of the steel sheet.
  • the widthwise scattering of the ink droplets occurs by 6.73 degrees in the width direction of the steel sheet.
  • the printing height of 5 mm was set here on the condition that the scattering of ink droplets becomes the maximum.
  • the advancing direction scattering of the ink droplets increased from 120 mm to more than 150 mm.
  • the widthwise scattering of the ink droplets occurs largely because the ink droplets are affected by the ambient airflow while falling on the steel sheet.
  • the flow development distance can be secured using the base frame 115. Specifically, in order to develop a uniform flow field in the jetting zone, which is a space between the nozzle 112 and the steel sheet, a flow development distance required around the printing area A, a printing zone, must be secured. This flow development distance may vary with print height and print speed.
  • 24 is a graph showing the minimum development flow distance according to the traveling speed of the steel sheet.
  • the x axis represents the printing speed and the y axis represents the minimum development flow distance.
  • the printing conditions were the same print height at 20 Khz ink ejection speed, 600 dpi resolution, the printing speed was different at the steel sheet speed of 10 mpm, 30 mpm, 50 mpm.
  • the minimum distance at which the first ink head 111 should be located from the inlet of the base frame 115 can be calculated according to the printing speed.
  • FIG. 25 is a side cross-sectional view showing an enlarged coupling view of the ink head 111. As shown in FIG.
  • the printing unit 110-2 uses the coupling plate 150 to fix the ink head 111 accommodated in the first opening 115a of the base frame 115.
  • the nozzle 112 of the ink head 111 is provided to protrude more than the ink head 111.
  • the nozzle 112 has the same height as the ink head 111 or its surroundings, it may be difficult to clean, and thus the nozzle 112 may be protruded.
  • the spacing between the steel plate and the nozzle 112 is only in the range of 0.8 mm to 1.2 mm, and considering the wave of the steel sheet, the spacing between the steel sheet and the nozzle 112 may be smaller than the above range. This is because if there is a portion protruding downwardly from the nozzle 112 around the nozzle 112, the steel sheet may be damaged.
  • the bottom height of the base frame 115 may be located between the ink head 111 and the nozzle 112.
  • the nozzle 112 may be provided to protrude about 0.3 mm from the base frame 115.
  • the bottom of the coupling plate 150 is recessed and provided than the base frame 115. That is, a concave space is formed between the ink head 111 and the base frame 115.
  • a uniform flow field must be formed in the printing area A in order for the ink droplets to fall precisely at the desired position.
  • Uniform flow fields can occur under uniform surfaces. Therefore, if there are irregularities around the ink head 111 or the nozzle 112, it is difficult to develop a uniform flow field.
  • a plurality of ink heads 111 may be installed to overlap each other in the width direction of the steel sheet. At this time, airflow may occur due to the influence of the space between the adjacent ink heads 111. In addition, a non-uniform flow may occur due to the space between adjacent nozzles 112 protruding from the ink head 111. As such, when a step is formed around the nozzle 112, a widthwise flow occurs to affect the path of the ink droplets.
  • FIG. 26 is a view showing the airflow of the printing unit 110-2 according to the third embodiment.
  • Figure 26 shows the results of the flow analysis for the width direction flow analysis.
  • the analysis result shows that the flow rate increased by 33% compared to the longitudinal direction in the gap between the two nozzles 112-1 and 112-2 with the severe deviation in the height direction is shifted by 25 ° based on the longitudinal direction, resulting in an uneven flow field in the printing area. You can check it.
  • This heterogeneous flow field is expected to adversely affect the image quality of the printed steel sheet and the rear image when printing the continuous image.
  • the direction of air flow occurs diagonally in the space between two adjacent nozzles 112-1 and 112-2, and the speed of the air flow is increased. If the speed of the air flow is increased only in a certain area or the direction of the air flow is out of the traveling direction of the steel sheet, an error may occur at the arrival point of the ink droplets, which may adversely affect the printing quality.
  • 27 is a photograph showing print quality according to height difference.
  • FIG. 27 shows ink droplets blowing when printed at a constant speed under a constant interval between the steel sheet and the nozzle 112 to confirm the effect of the height direction variation around the nozzle 112 in the printing area A on the image quality. It is a picture that tested the degree.
  • Fig. 28 is a graph showing the ink side velocity according to the advancing speed of the steel sheet.
  • the x axis represents the width direction of the steel plate
  • the y axis represents the width direction flow velocity.
  • 0.00 represents the point where the two nozzles 112-1 and 112-2 intersect
  • -0.10 represents the outer edge of the nozzle 112-2 located rearward
  • 0.10 represents the nozzle 112 located forward.
  • -1) shows the outer edge.
  • a rapid widthwise flow of about 0.1 m / s appears at the point where the two nozzles 112-1 and 112-2 intersect. At the intersections, the flow splits in different width directions. In addition, about 0.05 m / s of widthwise udon appears on the outer edge of the nozzle 112.
  • the printing unit 110-2 has to arrange a plurality of ink heads 111-1 and 111-2 in a zigzag manner as the width of the steel sheet becomes wider.
  • a space such as a hollow corrugation is created, and a flow field in the width direction instead of the length direction, which is the traveling direction of the steel sheet, through this space. This will occur.
  • the ink head 111-2 positioned rearward in the advancing direction of the steel sheet is behind the ink head 111-1 positioned forward, the ink head positioned forward with the nonuniform flow generated in the arrangement structure. Since the influence of the non-uniform flow field generated in (111-1) is compounded, the printing proceeds in a worse condition.
  • 29 is a perspective view illustrating a state in which the first auxiliary plate 152 is installed.
  • the first auxiliary plate 152 is installed to surround the nozzle 112 so that a uniform flow field is developed around the nozzle 112 in the width direction.
  • the first auxiliary plate 152 may be provided to fill a space between the nozzle 112 and the ink head 111.
  • the thickness of the first auxiliary plate 152 may be a thickness corresponding to the step between the nozzle 112 and the ink head 111.
  • FIG. 30 is a graph showing the ink side velocity according to the advancing speed of the steel sheet after installing the first auxiliary plate 152.
  • the x axis represents the width direction distance of the steel plate
  • the y axis represents the width direction flow velocity.
  • 0.00 represents the point where the two nozzles 112-1 and 112-2 intersect
  • -0.10 represents the outer edge of the nozzle 112-2 located rearward
  • 0.10 represents the nozzle 112 located forward.
  • -1) shows the outer edge.
  • FIG. 31 is a perspective view illustrating a state in which the second auxiliary plate 153 is installed.
  • the printing unit 110-3 according to the fourth embodiment of the present invention may further include a second auxiliary plate 153 to remove the step around the ink head 111.
  • the second auxiliary plate 153 may be provided to fill a space between the ink head 111 and the first opening 115a of the base frame 115.
  • the thickness of the second auxiliary plate 153 may be a thickness corresponding to the step between the coupling plate 150 and the base frame 115.
  • a step difference between the base frame 115 and the ink head 111 may be removed, and thus, uneven flow may be substantially removed.
  • a slight step may be formed between the second auxiliary plate 153 and the ink head 111.
  • the thickness of the second auxiliary plate 153 may be a thickness corresponding to the step between the coupling plate 150 and the ink head 111.
  • the step is removed between the ink head 111 and the second auxiliary plate 153. Much of the nonuniform flow can be eliminated. However, a slight step may be formed between the second auxiliary plate 153 and the base frame 115.
  • the second auxiliary plate 153 is a plate having a thickness corresponding to the step between the coupling plate 150 and the ink head 111 and the step between the ink head 111 and the base frame 115. It may be provided separately from the plate having a thickness corresponding to the. And the two plates can be disassembled and combined.
  • FIG. 32 is a perspective view illustrating a state in which the first and second auxiliary plates 152 and 153 are installed
  • FIG. 33 is a side cross-sectional view of FIG. 32.
  • the printing unit 110-4 may remove the step around the first auxiliary plate 152 and the ink head 111 to remove the step around the nozzle 112. It may further include a second auxiliary plate 153.
  • the step may be completely removed around the nozzle 112. That is, the base frame 115 and the nozzle 112 may be filled in the same plane. Therefore, all of the nonuniform flow is eliminated, and uniform flow develops around the nozzle 112, so that print quality can be improved.
  • 60 steel plate moving direction control device
  • 61 drive roll

Landscapes

  • Coating Apparatus (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Ink Jet (AREA)

Abstract

La présente invention concerne un appareil de fabrication de tôle d'acier revêtue par impression par jet d'encre. L'appareil de fabrication de tôle d'acier revêtue, selon un mode de réalisation de la présente invention, comprend un dispositif d'impression permettant d'imprimer sur une surface d'une tôle d'acier à l'aide d'une impression par jet d'encre, ledit dispositif d'impression comprenant : une pluralité de têtes d'impression par jet d'encre disposées dans la direction de progression de la tôle d'acier au niveau d'une zone d'impression ; et une pluralité de dispositifs de durcissement disposés à l'arrière de chaque tête d'impression par jet d'encre (la direction de progression de la tôle d'acier) pour durcir les gouttelettes d'encre déposées sur la tôle d'acier.
PCT/KR2016/012602 2015-11-03 2016-11-03 Appareil de fabrication de tôle d'acier revêtue par impression par jet d'encre WO2017078433A1 (fr)

Priority Applications (2)

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JP2018522654A JP6735824B2 (ja) 2015-11-03 2016-11-03 インクジェットプリンティングを利用したコーティング鋼板の製造装置
CN201680064072.XA CN108349243B (zh) 2015-11-03 2016-11-03 利用喷墨印刷的涂覆钢板的制造装置

Applications Claiming Priority (4)

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KR10-2015-0153841 2015-11-03
KR20150153841 2015-11-03
KR1020160105305A KR20180021321A (ko) 2016-08-19 2016-08-19 잉크젯 프린팅을 이용한 코팅 강판의 제조장치
KR10-2016-0105305 2016-08-19

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CN109080269A (zh) * 2017-06-13 2018-12-25 Posco公司 涂覆钢板的制造装置
WO2019162361A1 (fr) * 2018-02-26 2019-08-29 Bke-Machines International Sa Traçage sur une tôle destinée à un usage en chaudronnerie

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KR102164121B1 (ko) * 2018-08-30 2020-10-12 주식회사 포스코 잉크젯 프린팅을 이용한 코팅 강판의 제조장치
CN112874173B (zh) * 2019-11-29 2022-03-04 格洛布斯有限责任公司 一种用于在连续金属条带上数字打印的打印组件及方法
CN112848721A (zh) * 2021-01-14 2021-05-28 格力电器（郑州）有限公司 一种在金属表面形成纹路的方法和用途

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CN109080269A (zh) * 2017-06-13 2018-12-25 Posco公司 涂覆钢板的制造装置
CN109080269B (zh) * 2017-06-13 2020-08-18 Posco公司 涂覆钢板的制造装置
WO2019162361A1 (fr) * 2018-02-26 2019-08-29 Bke-Machines International Sa Traçage sur une tôle destinée à un usage en chaudronnerie
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JP2018534136A (ja) 2018-11-22
JP6735824B2 (ja) 2020-08-05
CN108349243B (zh) 2020-08-11

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