Inkjet printing system and inkjet printing method using the same

Abstract

The present invention discloses an inkjet printing system and an inkjet printing method using the same. According to one embodiment of the present invention, the inkjet printing system may include: a platform for mounting a printing medium and for moving the printing medium in a first direction; an inkjet head capable of moving in a second direction orthogonal to the first direction and having a plurality of nozzles capable of ejecting ink onto the printing medium; a measuring instrument capable of moving in the second direction independently of the inkjet head and capable of measuring the height of each section of a coating layer landed on the printing medium; and a processor capable of controlling the opening and closing of the nozzles based on the coating layer height information.

Description

Technical Field

[0001] The present invention relates to an inkjet printing system and an inkjet printing method using the same, and more particularly, to an inkjet printing system using an inkjet print head and an inkjet printing method using the same. Background Art

[0002] With the development of inkjet technology, inkjet printing is used in various fields, for example, for printing fonts on paper for office purposes, or for manufacturing electronic components or displays by forming thin films or patterns by ejecting droplets of ink.

[0003] In the manufacturing process, the material is converted into ink to eject droplets, and a predetermined coating is formed by landing the droplets on a desired location on a printing medium.

[0004] The ink used in the manufacturing process is cured by ultraviolet light or heat and remains liquid at room temperature. After landing on the printing medium, the coating is cured by applying ultraviolet light or heat.

[0005] During this series of coating formation processes, there is a problem of difficulty in forming the desired coating through inkjet printing due to various factors, such as uneven spraying in the spraying process, shape deformation such as ink diffusion and bleeding caused by ink fluidity before the curing process, and curing shrinkage in the curing process.

[0006] Prior art literature

[0007] Patent Literature

[0008] (Patent Document 0001) Korean Patent Publication No. 10-2019-0090108 (Publication Date: August 1, 2019) Summary of the Invention

[0009] Technical issues

[0010] A technical problem to be solved by the present invention is to provide an inkjet printing system and an inkjet printing method using the same, which can form a coating layer having a desired shape on a printing medium.

[0011] Solutions to the Problem

[0012] In order to solve the above technical problems, the present invention provides an inkjet printing system.

[0013] According to one embodiment of the present invention, an inkjet printing system may include: a platform for mounting a printing medium and moving the printing medium in a first direction; an inkjet head capable of moving in a second direction orthogonal to the first direction and having a plurality of nozzles, wherein the plurality of nozzles are capable of ejecting ink onto the printing medium; a measuring instrument capable of moving in the second direction independently of the inkjet head and capable of measuring the height of each interval of the coating landed on the printing medium; and a processor capable of controlling the opening and closing of the nozzles based on the height information of the coating.

[0014] According to an embodiment, the processor may include an interval inkjet volume adjustment module, and the interval inkjet volume adjustment module is used to adjust the interval inkjet volume of each interval of the printing medium.

[0015] According to an embodiment, the processor may further include an interval division module configured to divide the edge area of ​​the printed medium into at least two intervals in the second direction.

[0016] According to an embodiment, the processor may include an inkjet start position adjustment module, and the inkjet start position adjustment module is used to adjust the inkjet start position.

[0017] In order to solve the above technical problems, the present invention provides an inkjet printing method.

[0018] According to one embodiment of the present invention, the inkjet printing method may include: a measuring step for measuring the height of ink landing on a first printing medium; and an inkjet control step for controlling the opening and closing of the nozzle ejected on a second printing medium (substrate) based on the ink landing height.

[0019] According to an embodiment, the inkjet control step may include a height comparison step, wherein the height comparison step is a step of comparing the height measurement information of each interval with height reference information to adjust the height information of each interval.

[0020] According to one embodiment, the ink ejection control step may further include an ink ejection amount adjustment step, and the ink ejection amount adjustment step is a step of adjusting an ink ejection start position.

[0021] Effects of the Invention

[0022] According to the embodiment of the present invention, there is an advantage in that a coating layer having a desired shape according to printing can be formed by providing a processor capable of controlling opening and closing of a nozzle in units of sections.

[0023] According to one embodiment of the present invention, there is the following advantage, namely, the processor can increase or decrease the actual ink coating amount based on the height information of the coating actually landed on the first printing medium, thereby improving the coating formation control capability and obtaining the desired coating shape formed on the second printing medium.

[0024] According to another embodiment of the present invention, there is an advantage that the processor increases or decreases the actual ink coating amount according to the height information of the actual landed coating obtained by the measuring instrument, and the required coating can be flexibly formed without replacing the equipment.

[0025] According to another embodiment of the present invention, there is the following advantage, namely, the processor increases or decreases the actual ink coating amount based on the height information of the actual landed coating obtained by the measuring instrument, so that it can be widely used according to the specification characteristics of the applicable printing media, ink and manufacturing process.

[0026] According to another embodiment of the present invention, there is the following advantage, namely, the processor increases or decreases the actual ink coating amount based on the height information of the actual landing coating obtained by the measuring instrument, thereby meeting the characteristics and quality yield required by different printing media and ink characteristics. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Part (a) and Figure 1 Part (b) is a diagram illustrating various inkjet printing systems according to an embodiment of the present invention.

[0028] Figure 2 Part (a) is based on Figure 1 (a) A side view of an inkjet printing system. Figure 2 Part (b) is Figure 2 Front view of part (a).

[0029] Figure 3 Part (a) to Figure 3 Part (d) is a diagram showing the degree of ink ejection amount adjustment for each interval by the interval ink ejection amount adjustment module according to an embodiment of the present invention.

[0030] Figure 4 Part (a) to Figure 4 Part (d) is an action flow chart showing the action flow of the processor according to one embodiment of the present invention.

[0031] Figure 5 Part (a) to Figure 5 Part (c) is a diagram showing each interval calculated by the interval ink ejection amount adjustment module according to an embodiment of the present invention.

[0032] Figure 6This is a diagram showing a print ejection area marked for each ejection position on a print medium according to an embodiment of the present invention.

[0033] Figure 7 This figure shows a printing medium having a printing area that is loosened compared to a printing design area according to an embodiment of the present invention.

[0034] Figure 8 Part (a) to Figure 8 Part (c) is Figure 7 An action flow chart showing the flow of actions of a processor in FIG.

[0035] Figure 9 This figure shows a printing medium having a printing area that is reduced in size compared to a design printing area according to an embodiment of the present invention.

[0036] Figure 10 Part (a) to Figure 10 Part (c) shows Figure 9 An action flow chart showing the flow of actions of a processor in FIG.

[0037] Figure 11 is a flow chart illustrating an inkjet printing method according to an embodiment of the present invention.

[0038] Description of Reference Numerals

[0039] 10: Inkjet printing system

[0040] 100: Platform

[0041] 200: inkjet head

[0042] 210: Door frame

[0043] 300: UV curing machine

[0044] 400: Measuring instruments

[0045] 500: Processor

[0046] 510: interval inkjet volume adjustment module

[0047] 520: Interval division module

[0048] 530: Inkjet start position adjustment module

[0049] S: Print media

[0050] P: coating

[0051] A1: Printing design area

[0052] A2: Printing area DETAILED DESCRIPTION

[0053] Preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the technical spirit of the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments described herein are provided to make the disclosure of the present invention thorough and complete, and to fully convey the concept of the present invention to those skilled in the art.

[0054] In this specification, when a component is mentioned as being located above another component, it means that it can be directly formed above the other component or that a third component can be interposed between the two. In addition, the shapes and sizes in the figures are exaggerated for the purpose of effectively illustrating the technical content.

[0055] In addition, in various embodiments of this specification, terms such as first, second, and third are used to describe various components, but these components should not be limited to such terms. These terms are used only to distinguish a component from another component. Therefore, when mentioned as a first component in a certain embodiment, it can also be mentioned as a second component in another embodiment. The various embodiments described and illustrated herein also include their complementary embodiments. In addition, the meaning of "and / or" used in this specification includes at least one component among the components listed before and after.

[0056] In addition, unless otherwise expressly stated, descriptions indicating the singular should be understood to include the plural. Furthermore, terms such as "including" or "having" are intended to specify the presence of a feature, number, step, component, or combination thereof described in the specification and should not be interpreted as excluding the presence or additional possibility of one or more other features, numbers, steps, components, or combinations thereof. Furthermore, "connected" as used in this specification includes both indirect and direct connections of multiple components.

[0057] Furthermore, in the process of describing the present invention, if a detailed description of the configuration or function of related known technologies is deemed to obscure the gist of the present invention, such detailed description may be omitted.

[0058] For ease of description, the first direction refers to the Y-axis direction of the Cartesian coordinate system, and the second direction refers to the X-axis direction of the Cartesian coordinate system. In this case, the first direction is orthogonal to the second direction.

[0059] Figure 1 Part (a) and Figure 1 Part (b) is a diagram showing each inkjet printing system 10 according to an embodiment of the present invention, Figure 2 Part (a) is based on Figure 1 (a) is a side view of the inkjet printing system 10, Figure 2 Part (b) is Figure 2Front view of part (a), Figure 3 Part (a) to Figure 3 Part (d) is a diagram showing the degree of ink ejection amount adjustment for each interval by the interval ink ejection amount adjustment module 510 according to an embodiment of the present invention. Figure 4 Part (a) to Figure 4 Part (d) is an action flow chart showing the action flow of the processor 500 according to one embodiment of the present invention. Figure 5 Part (a) to Figure 5 Part (c) is a diagram showing each interval calculated by the interval inkjet amount adjustment module 510 according to an embodiment of the present invention. Figure 6 1 is a diagram showing a print ejection area marked for each ejection position on a print medium S according to an embodiment of the present invention. Figure 7 FIG. 1 is a diagram showing a printing medium S having a printing formation area A2 that is loosened compared to a printing design area A1 according to an embodiment of the present invention. Figure 8 Part (a) to Figure 8 Part (c) shows Figure 7 The action flow chart of the flow of actions of the processor 500 is shown in FIG. Figure 9 FIG. 1 is a diagram showing a printing medium S having a printing area A2 that is smaller than a printing design area A1 according to an embodiment of the present invention. Figure 10 Part (a) to Figure 10 Part (c) shows Figure 9 Flowchart of the action flow of the processor 500 in FIG.

[0060] Hereinafter, each component constituting the inkjet printing system 10 according to an embodiment of the present invention will be described in detail.

[0061] Reference Figure 1 Part (a) to Figure 10 In part (c), the inkjet printing system 10 according to one embodiment of the present invention may include a platform 100, an inkjet head 200, a measuring instrument 400, and a processor 500. In the inkjet printing system 10, the printing medium S moves along a first direction on the platform 100, and is sequentially ejected and landed by the inkjet head 200 to form a coating. The measuring instrument 400 measures the shape of the coating P to have a measurement value, and the processor 500 increases or decreases the ink coating amount according to the measurement value, thereby being able to form a coating P with a desired shape. The printing medium S may include a first printing medium S and a second printing medium S. The ink coating process of the second printing medium S may be performed after the coating is formed on the first printing medium S. In addition, in the second printing medium S, the ink coating process may be performed closer to the printing design area A1 than in the first printing medium S. As Figure 5 As shown, a printed medium S may have an edge region and a center region.

[0062] The inkjet printing system 10 can be applied to organic material printing process for making RGB pixels, liquid optical clear resin (OCR) printing process, panel encapsulation (ENCAPSULATION) material printing process, etc. Figure 1 Part (a) and Figure 1 Part (b) shows different printing processes.

[0063] Refer again Figure 1 Part (a) to Figure 3 Part (d) of Figure 5 Part (a) to Figure 7 and Figure 9 The platform 100 can be mounted with a printing medium S. The platform 100 can move the printing medium S in a first direction by driving a moving driving unit (not shown).

[0064] Under the control of the processor 500 described below, the platform 100 can adjust the position of the printing medium S so that the printing medium S faces one of the inkjet head 200, the UV curing machine 300, and the measuring instrument 400 described below.

[0065] Refer again Figure 1 Part (a) to Figure 3 Part (d) and Figure 6 The inkjet head 200 can move in the second direction. The inkjet head 200 can be moved to any position in the second direction in a manner facing the printing medium S by driving a head driving unit (not shown) on a gantry (not shown).

[0066] The inkjet head 200 can eject ink onto the print medium S. The inkjet head 200 can form a coating by ejecting ink onto the first print medium S and the second print medium S at different times. According to one embodiment, the inkjet head 200 can eject ink while adjusting the depth per unit (DPI) according to the drive control of the processor 500. Furthermore, the inkjet head 200 can eject ink based on print ejection data. According to another embodiment, the processor 500 can adjust the volume of ink droplets ejected at each arbitrary position, the number of ejections, and other parameters.

[0067] The inkjet head 200 may include a gantry (not shown in the drawings), tens or thousands of nozzles (not shown in the drawings), and an ink supply portion (not shown in the drawings) located on an inkjet path.

[0068] The gantry (not shown) may provide a moving path for the inkjet head 200 in the second direction to be orthogonal to the platform 100 .

[0069] The nozzle (not shown in the drawings) may eject ink having a fine size in the form of droplets.

[0070] The ink supply portion (not shown in the drawings) may be mounted on a gantry (not shown in the drawings) or disposed inside the inkjet head 200 .

[0071] Refer again Figure 1 Part (a) to Figure 2 , the UV curing machine 300 can move in the second direction. Driven by a curing machine driving unit (not shown in the figure) on a gantry (not shown in the figure), the UV curing machine 300 can move to any position in the second direction in a manner facing the printing medium S. The UV curing machine 300 is supported and positioned on the other side of the gantry (not shown in the figure) so as to face the inkjet head 200 on a gantry (not shown in the figure), or can be set on another gantry (not shown in the figure) different from the gantry (not shown in the figure) on which the inkjet head 200 is provided. The UV curing machine 300 is arranged parallel to the inkjet head 200 and can move independently in the second direction.

[0072] The UV curing machine 300 can cure the ink landed on the printing medium S. The UV curing machine 300 can perform the ink curing process on the printing medium S independently of the ink ejecting process.

[0073] Refer again Figure 1 Part (a) to Figure 2 In part (a), the measuring instrument 400 can measure the surface shape information of the printing medium S. The measuring instrument 400 can measure the height information of the coating layer P included in the printing medium S. The measuring instrument 400 can measure the surface shape information of the coating layer P that is formed by solidifying the deposited coating layer P to reduce fluidity and evaporate volatile substances to minimize shape deformation.

[0074] The measuring instrument 400 is movable in the second direction. Driven by a measuring instrument drive unit (not shown) on a gantry (not shown), the measuring instrument 400 can be moved to any position in the second direction, facing the print medium S. The measuring instrument 400 is arranged parallel to the inkjet head 200 and the UV curing machine 300 and can independently move in the second direction.

[0075] The measuring instrument 400 can scan the surface of the print medium S. According to one embodiment, the measuring instrument 400 can be a displacement sensor. The displacement sensor can obtain information about the height of each section of the print medium S and the coating layer P landed on the print medium S by ejecting ink from the inkjet head 200, based on an arbitrary reference surface.

[0076] The measuring instrument 400 can be either contact or non-contact. When the measuring instrument 400 according to one embodiment is non-contact, it irradiates the surface of the print medium S with laser light and senses the pattern of reflected light from the surface of the print medium S to obtain a three-dimensional image of the surface of the print medium S. To this end, the measuring instrument 400 may include a laser irradiation unit, a laser receiving unit (not shown), and an image processing device (not shown).

[0077] Reference Figure 1 Part (a) to Figure 2 In part (b), the processor 500 may control the opening and closing of the nozzle (not shown) based on the height information of the coating layer P. The processor 500 may control the amount of ink ejected by the inkjet head 200 for the printing medium S on which the coating layer P will be subsequently formed based on the height information of the coating layer P formed on the printing medium S.

[0078] According to one embodiment, the processor 500 can generate the amount of ink ejected to the second print medium based on the height of the coating layer P in each section of the first print medium. By executing the processor 500 at least once, the required height of the coating layer P can be calculated for each section. The processor 500 can calculate the height of the coating layer P of the second print medium, which is different from the height of the coating layer of the first print medium in each section. By repeatedly executing the processor 500, the ideal ejection amount can be derived over multiple times. The processor 500 can determine the second ink ejection amount based on the previously formed coating layer P to obtain an ink amount close to the ideal printing design value.

[0079] The processor 500 may include an interval inkjet amount adjustment module 510 , and may further include an interval division module 520 and an inkjet start position adjustment module 530 .

[0080] The processor 500 may control the displacement of the platform 100 relative to the printing medium S. The processor 500 may change the position of the printing medium S facing the inkjet head 200. To this end, the processor 500 may move the position of the platform 100 on which the printing medium S is mounted in a first direction.

[0081] For the inkjet head 200 , the processor 500 can control the size and ejection speed of ink droplets, the landing time of ink droplets, whether the nozzle (not shown in the figure) ejects, the displacement of the inkjet head 200 , etc.

[0082] For the UV curing machine 300 , the processor 500 can control the position, irradiation direction, irradiation light intensity, curing time, etc. of the UV curing machine 300 .

[0083] For the measuring instrument 400 , the processor 500 may control the position of the measuring instrument 400 , whether to perform measurement, etc., and may call and receive measurement data of the measuring instrument 400 .

[0084] The processor 500 may operate the platform 100 , the inkjet head 200 , the UV curing machine 300 , and the measuring instrument 400 in a mutually connected manner.

[0085] Refer again Figure 4 Part (a) to Figure 4 Part (d) and Figure 8 Part (a) to Figure 8 In part (c), the interval inkjet amount adjustment module 510 can adjust the interval inkjet amount of each interval of the printing medium S. The interval inkjet amount adjustment module 510 can adjust to increase or decrease the ejection amount of the inkjet head 200 used to form the coating layer P. The interval inkjet amount adjustment module 510 can call the height information of each interval of the coating layer P from the measuring instrument 400. The interval inkjet amount adjustment module 510 can compare the reference height of each interval with the height information. Figure 4 Part (a) to Figure 4 Part (d) will describe the ink discharge amount adjustment process of increasing or decreasing the ink discharge information during the process of forming the coating layer P on the first printing medium S to the fourth printing medium S so that the ink discharge information is close to the ink design standard. Figure 4 Part (a) shows a comparison between a coating layer P formed on a first printing medium S and an ink design standard. Figure 4 Part (b) shows the second ink discharge information calculated by increasing or decreasing the first ink discharge amount of the first printing medium S, and the comparison between the coating layer P formed on the second printing medium S and the ink design standard. Figure 4 Part (c) shows the third ink discharge information calculated by increasing or decreasing the second ink discharge amount of the second printing medium S, and the comparison between the third coating layer P formed on the third printing medium S and the ink design standard. Figure 4 Part (d) shows fourth inkjet information calculated by increasing or decreasing the third ink discharge amount of a third printing medium (not shown), and compares the fourth coating layer P formed on the fourth printing medium S with the ink design standard. More specifically, the inkjet printing system obtains ink discharge information that meets the ink design standard during the fourth printing process on the fourth printing medium.

[0086] When the height information is the same as the reference height, the interval ink ejection amount adjustment module 510 may not adjust the ejection amount, so that the inkjet head 200 ejects ink in the corresponding interval at the same amount as the set ejection amount.

[0087] The interval inkjet volume adjustment module 510 can adjust the print jetting data to increase or decrease the set jetting volume for each print jetting area in each interval. The interval inkjet volume adjustment module 510 can calculate the jetting volume to be increased or decreased relative to the set jetting volume as a percentage (%). When the height information exceeds a reference height, the jetting rate for the corresponding interval can be adjusted to decrease. When the height information does not reach the reference height, the jetting rate for the corresponding interval can be adjusted to increase.

[0088] Refer again Figure 3 Part (a) to Figure 3 In part (d), the printing ejection area can be calculated based on the ejection rate of the inkjet head 200 per unit area. Figure 3 Part (a) is a diagram showing a coating P formed when the coating is sprayed at a spray rate of 50% compared to the per unit area basis. Figure 3 Part (b) is a diagram showing a coating P formed when the coating is sprayed at a spray rate of 75% compared to the per unit area standard. Figure 3 Part (c) is a diagram showing a coating P formed when the coating is sprayed at a spray rate of 100% compared to the per unit area basis. Figure 3 Part (d) is a diagram showing a coating layer P formed when the spraying is performed at a spraying rate of 125% compared to the per unit area basis.

[0089] Again, as Figure 6 As shown, when the interval inkjet quantity adjustment module 510 calculates the second inkjet information of the second printing medium S, i.e., the inkjet quantity, the interval inkjet quantity adjustment module 510 can adjust the edge area and the center area of ​​each printing ejection area on the first printing medium S, especially the ejection rate in the edge area.

[0090] Again, as Figure 3 Part (a) to Figure 3 Part (d) and Figure 6 As shown, the interval inkjet volume adjustment module 510 can selectively control the opening and closing of nozzles (not shown) constituting the inkjet head 200 in interval units. The interval inkjet volume adjustment module 510 can control the ejection volume and the number of ejections of the nozzles (not shown) in each interval.

[0091] The interval inkjet volume adjustment module 510 can increase or decrease the ejection volume of each interval unit based on the initial ejection volume. The interval inkjet volume adjustment module 510 can generate second inkjet information, which is calculated by increasing or decreasing the first inkjet volume printed on the coating layer P. The interval inkjet volume adjustment module 510 can adjust the inkjet volume based on the DPI-based interval unit. When the interval unit height exceeds the reference height, the interval inkjet volume adjustment module 510 according to one embodiment can adjust to reduce the ejection volume relative to the set ejection volume. When the interval unit height does not reach the reference height, the interval inkjet volume adjustment module 510 according to another embodiment can adjust the ejection volume to increase the ejection volume relative to the set ejection volume.

[0092] The section division module 520 can divide the printed medium S into at least two regions along the first direction or the second direction. More specifically, the section division module 520 can divide the printed medium S, especially the edge region, into at least two regions.

[0093] According to an embodiment, the section dividing module 520 may divide the printed medium S at certain intervals along one direction.

[0094] According to another embodiment, the interval division module 520 can divide the printed medium S at arbitrary intervals along one direction. More specifically, as Figure 5 As shown in part (a) of FIG, the interval division module 520 can divide the area so that the intervals between the edge area and the center area are different. Figure 5 Part (b) and Figure 5 As shown in part (c), the interval division module 520 can divide the edge region, especially the edge peak region, into denser intervals.

[0095] Refer again Figures 7 to 10 In part (c), the inkjet start position adjustment module 530 can adjust the inkjet start position. The inkjet start position adjustment module 530 can adjust the printing formation area A2 by calculating and adjusting adjustment parameters that are different from those of the printing design area A1.

[0096] The print design area A1 may be the designed print ejection data. The print formation area A2 may be the coating layer P actually formed and measured. Adjustment parameters may include, but are not limited to, information on the surface energy of the printing medium, ink characteristics, required curing time after ejection, ink ejection volume, and waveform signal information.

[0097] When the print formation area A2 is larger than the print design area A1, the inkjet start position adjustment module 530 according to one embodiment may move the inkjet start position toward the inside of the print medium S. When the print formation area A2 is smaller than the print design area A1, the inkjet start position adjustment module 530 according to another embodiment may move the inkjet start position toward the outside of the print medium S.

[0098] The printed medium S may be a display panel such as an LCD, OLED, or PDP panel, a touch panel, or a window panel, or may be a panel composed of multiple layers stacked together. Furthermore, the printed medium S may include a rigid panel and a flexible panel made of a flexible material that can be bent, folded, or rolled.

[0099] The printing medium S may be disposed under the inkjet head 200 for the ejected ink to land on, thereby forming a coating layer P.

[0100] At this time, the ink can be one of acrylic resin, epoxy resin, silicone resin or rubber resin or a mixture thereof, preferably a UV curable resin that can be cured by UV light. The ink can be sprayed on the printing medium S to form a coating layer P.

[0101] An inkjet printing method according to an embodiment of the present invention including the components described above will be described.

[0102] Figure 11 is a flow chart illustrating an inkjet printing method according to an embodiment of the present invention.

[0103] Reference Figure 11 The inkjet printing method according to an embodiment of the present invention may further include a measuring step S10 and an inkjet control step S20.

[0104] In the measuring step S10, the surface shape information including the height of the coating layer of the printing medium can be measured. In the measuring step S10, the width information of the printing medium, the coordinate information of each section, whether each section has a coating layer, and the height information of the coating layer of each section can be measured. Figure 5 As shown, in the measuring step S10 , the first printed medium is divided into at least two sections in the first direction and the second direction, and the intervals between the edge area and the center area of ​​each section can be divided differently.

[0105] The inkjet control step S20 may include a height comparison step S21, an inkjet data calculation step S22, and an inkjet amount adjustment step S23. Each step of the inkjet control step S20 may be executed at least once.

[0106] In the height comparison step S21, the height information of each section can be compared with the height reference information to adjust the height information. More specifically, in the height comparison step S21, the height information of each section of the first print medium can be compared with the reference height information, and the height information of each section of the second print medium can be adjusted.

[0107] In the ink ejection data calculation step S22, the ink ejection data may be calculated based on the adjusted height information. More specifically, in the ink ejection data calculation step S22, the increase or decrease in the ink ejection amount of each portion of the first printing medium may be calculated based on the adjusted coating height information.

[0108] In the inkjet amount adjustment step S23, the inkjet amount for each section of the inkjet head can be adjusted based on the calculated inkjet data. In the inkjet amount adjustment step S23, the inkjet start position can be adjusted. More specifically, in the inkjet amount adjustment step S23, the second print media inkjet head can be turned on / off differently from the first print media inkjet head.

[0109] In summary, although the present invention has been described in detail by way of preferred embodiments, the scope of the present invention is to be interpreted by way of the appended claims and is not to be limited by the specific embodiments described above. In addition, it will be apparent to those skilled in the art that various changes and modifications may be made without departing from the scope of the present invention.

Claims

1. An inkjet printing system, characterized in that: include: A platform for mounting printing media and moving the printing media in a first direction, wherein the printing media includes a first printing media and a second printing media and has an edge area and a center area; an inkjet head capable of moving in a second direction perpendicular to the first direction and having a plurality of nozzles formed therein, wherein the plurality of nozzles are capable of ejecting ink onto the first printing medium; a measuring instrument capable of moving in the second direction independently of the inkjet head and capable of measuring the height of each section of the coating layer landed on the first printing medium; and The processor controls the opening and closing of the nozzle by increasing or decreasing the amount of ink discharged in each section based on the height information of the coating layer landed on the first printing medium, thereby forming a coating layer on the second printing medium. The processor includes an interval inkjet volume adjustment module, which is used to adjust the interval inkjet volume of the second printing medium. The interval inkjet volume is adjusted by increasing or decreasing the interval inkjet volume of the first printing medium. The processor further includes an interval division module, which is configured to divide the second printed medium into at least two intervals in the first direction or the second direction, and to divide the intervals in the edge area and the center area into different intervals.

2. The inkjet printing system according to claim 1, wherein: The processor includes an inkjet start position adjustment module, which is used to adjust the inkjet start position.

3. An inkjet printing method for forming a coating on a first printing medium and a second printing medium at different times, characterized in that: include: A measuring step of measuring the height of the coating layer formed on the first printing medium in each interval; and The inkjet control step controls the opening and closing of the nozzle by increasing or decreasing the amount of ink ejected from the first printing medium in each of the intervals based on the height information of the coating layer, thereby forming a coating layer on the second printing medium. The height information of the coating layer of the first printing medium and the height information of the coating layer of the second printing medium may be different. In the measuring step, the edge area and the center area of ​​the first printing medium are divided into at least two sections along a first direction and a second direction perpendicular to the first direction, wherein the intervals between the edge area and the center area can be different.

4. The inkjet printing method according to claim 3, wherein: The inkjet control step includes a height comparison step, which is a step of comparing the height measurement information of each interval of the first printing medium with the height reference information to adjust the height information of each interval of the second printing medium.

5. The inkjet printing method according to claim 3, wherein: The ink ejection control step further includes an ink ejection amount adjustment step, which is a step of adjusting an ink ejection start position.

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