KR-20260062223-A - CONTROL SYSTEM FOR ELECTRO-HYDRODYNAMIC PRINTING AND CONTROL METHOD FOR ELECTRO-HYDRODYNAMIC PRINTING USING THE SAME

Abstract

In an electrohydrodynamic printing control system using artificial intelligence and an electrohydrodynamic printing control method using the same, the printing control system controls electrohydrodynamic printing and includes a shooting unit, a learning unit, and a judgment unit. The shooting unit acquires an image of a polymer jet extending between a nozzle unit and a substrate unit. The learning unit learns a deposition state according to the process conditions based on the process conditions of the printing process, the image of the polymer jet, and the deposition state on the substrate unit. When a deposition state is derived from the input process conditions using the learning result of the learning unit, the judgment unit determines the printing state using the deposition state.

Inventors

• 신동운
• 이창우
• 하태호
• 허세곤
• 이필호
• 최준필
• 정민교
• 김용래

Assignees

• 한국기계연구원

Dates

Publication Date

20260507

Application Date

20241028

Claims (13)

1. In a print control system that controls electrohydrodynamic printing, A shooting unit that acquires an image of a polymer jet extending between a nozzle part and a substrate part; A learning unit that learns a deposition state according to the process conditions based on the process conditions of the printing process, the image of the polymer jet, and the deposition state on the substrate; and A printing control system comprising a judgment unit that determines a printing state using the deposition state when a deposition state is derived using the learning result of the learning unit from input process conditions.
2. In paragraph 1, the above process conditions are, A printing control system characterized by including a voltage applied to the nozzle portion, an inner diameter and an outer diameter of the nozzle portion, a transfer speed of the substrate portion, and a distance from the end of the nozzle portion to the substrate portion.
3. In paragraph 2, the image of the polymer jet is, A printing control system characterized by including centerline and outline information of the polymer jet.
4. In paragraph 3, the deposition state on the substrate portion is, A printing control system characterized by including the thickness and shape of a polymer jet deposited on the substrate.
5. In paragraph 4, the above learning unit is, Learning the relationship between the above process conditions, the centerline and outline information of the polymer jet, and the thickness and shape of the polymer jet, A printing control system characterized by deriving centerline and outline information of the polymer jet, and the thickness and shape of the polymer jet, from the input process conditions using the learned results above.
6. In paragraph 5, the above-mentioned learning unit is, A printing control system characterized by including a visualization unit that visualizes the behavior of the polymer jet based on the centerline and outline information of the polymer jet derived above.
7. In paragraph 1, the above learning unit is, A print control system characterized by including a filtering unit that selectively removes the image of the polymer jet.
8. In paragraph 7, the filtering unit is, In the image of the polymer jet extending downward from the nozzle portion toward the substrate portion, A printing control system characterized by removing an image of the lower polymer jet from the position where the thickness of the polymer jet increases as it moves toward the lower direction.
9. In paragraph 8, the above-mentioned learning unit is, A printing control system characterized by further including a learning execution unit that performs the learning using both an image of a normal state polymer jet in which the thickness of the polymer jet decreases as it moves toward the downward direction and an image of the polymer jet in which a portion has been removed by the filtering unit.
10. In paragraph 1, A printing control system further comprising a control unit that controls the printing process in real time based on the printing status determined by the above-mentioned judgment unit.
11. A step of performing electrohydrodynamic printing according to the process conditions of the printing process; A step of acquiring an image of a polymer jet extending between a nozzle portion and a substrate portion; A step of measuring the deposition state of a polymer jet deposited on the substrate; A step of learning a deposition state according to the process conditions based on the process conditions, the image of the polymer jet, and the deposition state on the substrate; and A printing control method comprising the step of determining a printing state using the deposition state when a deposition state is derived from input process conditions using the learning result of the above-mentioned learning unit.
12. In Paragraph 11, A printing control method further comprising the step of controlling the printing process in real time based on the above printing status determination result.
13. In Clause 11, the learning step above is, In the image of the polymer jet obtained above, a step of removing the image of the lower polymer jet from the corresponding position where the thickness increases in the downward direction; and A printing control method characterized by including a step of performing learning using both the image of the polymer jet with a portion removed and the image of the polymer jet in a normal state.

Description

Electro-hydrodynamic printing control system using artificial intelligence and electro-hydrodynamic printing control method using the same {CONTROL SYSTEM FOR ELECTRO-HYDRODYNAMIC PRINTING AND CONTROL METHOD FOR ELECTRO-HYDRODYNAMIC PRINTING USING THE SAME} The present invention relates to an electrohydrodynamic printing control system and an electrohydrodynamic printing control method using the same, and more specifically, to an electrohydrodynamic printing control system using artificial intelligence that determines the printing state and controls printing in real time based on the results of learning the behavior of a polymer jet between a nozzle and a substrate in electrohydrodynamic or electro-hydrodynamic 3D printing, and an electrohydrodynamic printing control method using the same. Electro-hydrodynamic (EHD) 3D printing is a printing method in which a polymer solution is electrically attracted and deposited onto a substrate by inducing an electric field through the application of voltage between a nozzle and a substrate. As disclosed in Korean Patent Publication No. 10-2015-0011177 or Korean Patent Publication No. 10-2016-0112320, such as EHD printing, it is possible to form very precise patterns with micro or nano-sized functional fibers, and its utility has recently been increasing. In this EHD printing, the distance between the nozzle and the substrate must be maintained at a constant level to form a displacement difference. Accordingly, as the polymer solution moves from the nozzle to the substrate, the solvent increases rapidly due to the electric field, and the polymer jet thins due to shear stress. Thus, micro or nano-sized fibers are finally deposited on the substrate. However, when depositing these fibers onto a substrate, it is not easy to accurately predict the deposition thickness or deposition pattern of the fibers. In particular, predicting this using conventional computational analysis methods is time-consuming, which limits the ability to control the printing process in real time. FIG. 1a is a schematic diagram illustrating the injection state of a polymer jet in electrohydrodynamic printing in which the nozzle and the substrate are not moving relative to each other. FIG. 1b is a schematic diagram illustrating the injection state of a polymer jet in which the nozzle and the substrate are moving relative to each other in electrohydrodynamic printing. FIG. 2 is a block diagram illustrating an electrohydrodynamic printing control system according to one embodiment of the present invention. Figure 3 is a block diagram for specifically explaining the learning section of Figure 2. Figure 4 is a flowchart illustrating a print control method using the print control system of Figure 2. Figure 5 is a flowchart illustrating the printing control method of Figure 4 in more detail. Figure 6 is a schematic diagram illustrating the image filtering step of Figure 5. Figure 7 is a schematic diagram illustrating the steps for performing the learning of Figure 5. Figure 8 is a schematic diagram illustrating the step of determining the printing state using the learning results of Figure 5. FIGS. 9a to 9c are images showing the shape of a polymer jet predicted using the printing control system of FIG. 2 and the shape of a polymer jet actually measured. The present invention is susceptible to various modifications and may take various forms, and embodiments are to be described in detail in the text. However, this is not intended to limit the invention to the specific disclosed forms, and it should be understood that the invention includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the invention. Similar reference numerals have been used for similar components in the description of each figure. Terms such as "first," "second," etc., may be used to describe various components, but said components should not be limited by said terms. The above terms are used solely for the purpose of distinguishing one component from another. The terms used in this application are used merely to describe specific embodiments and are not intended to limit the invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this application, terms such as "comprising" or "consisting of" are intended to specify the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof. Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the attached drawings. First, before describing the printing control system and printing control method according to an embodiment of the present invention, the characteristics of the polymer jet injection state in gener