Coating die head

Abstract

The utility model provides a coating die head. The coating die head comprises an upper coating die holder, a lower coating die holder and a lower coating die holder, wherein the upper coating die holder is provided with an upper liquid storage groove and an upper accommodating groove; the lower coating die holder is provided with a lower liquid storage tank and a lower accommodating tank; and the coating roller is rotationally mounted in an area defined by the upper coating die holder and the lower coating die holder, and a coating groove is formed in the coating roller. The coating liquid can be injected into the liquid storage tank defined by the upper liquid storage tank and the lower liquid storage tank through the liquid injection nozzle; the two ends of the coating groove are respectively communicated with the two ends of the liquid storage groove, so that the coating liquid in the liquid storage groove can flow into the coating groove. The coating roller is rotationally mounted in the area defined by the upper containing groove and the lower containing groove, the coating die head rotates in the coating process, the coating liquid flowing out of the coating groove can be attached to the base material, the fluid stability of the coating liquid can be improved, and therefore the coating uniformity is improved. And moreover, the rotationally arranged coating roller is not provided with an external tooth-shaped cavity structure, so that the damage to the base material can be reduced, and the coating quality and precision are improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of coating, and more particularly to a coating die. BACKGROUND

[0002] The coating process is a method for preparing a thin film by a solution method, which has the advantages of various materials, adjustable performance, low production cost, high production efficiency, etc., and is favored by people. At present, two methods of slot coating and bar coating are mainly used. Slot coating is a coating method in which the coating liquid is pressed out along the gap of the coating die under a certain pressure and transferred to the substrate. Bar coating is a coating method in which the cavity area of the tooth shape of the metering rod is used to quantitatively scrape the liquid on the surface of the substrate, and the excess coating liquid is scraped off by precise quantitative control. Different metering rod models are selected according to the actual coating amount required by production to realize precise control of the coating amount.

[0003] However, in slot coating, the liquid bridge stability between the knife head and the substrate is poor, which easily affects the uniformity of coating. The adjustment range of the coating amount in bar coating is small, and the bar marks are easily left on the substrate, thereby causing damage to the substrate. CONTENT OF THE INVENTION

[0004] The purpose of the embodiment of the application is to provide a coating die to solve the problem of poor coating uniformity and easy damage to the substrate in the related art.

[0005] To achieve the above purpose, the technical scheme adopted by the embodiment of the application is:

[0006] A coating die is provided, comprising:

[0007] A coating upper die holder is provided with an upper liquid storage groove and an upper accommodating groove in communication with the upper liquid storage groove, and the coating upper die holder is provided with a liquid injection nozzle in communication with the upper liquid storage groove;

[0008] A coating lower die holder is provided with a lower liquid storage groove and a lower accommodating groove in communication with the lower liquid storage groove, and the lower liquid storage groove and the upper liquid storage groove form a liquid storage groove for accommodating the coating liquid;

[0009] A coating roller is rotatably installed in the area enclosed by the upper accommodating groove and the lower accommodating groove, the coating roller is provided with a coating groove along the axial direction thereof, and the two ends of the coating groove are in communication with the two ends of the liquid storage groove.

[0010] In one embodiment, the upper liquid storage tank comprises a first upper tank portion, two second upper tank portions respectively arranged at two ends of the first upper tank portion, and a third upper tank portion communicating each of the second upper tank portions with the upper accommodating tank, each of the second upper tank portions communicates the first upper tank portion with the corresponding third upper tank portion, and the liquid injection nozzle communicates with the first upper tank portion; the lower liquid storage tank comprises a first lower tank portion in alignment and communication with the first upper tank portion, two second lower tank portions respectively arranged at two ends of the first lower tank portion, and a third lower tank portion communicating each of the second lower tank portions with the lower accommodating tank, each of the second lower tank portions communicates the first lower tank portion with the corresponding third lower tank portion, the two second lower tank portions are in alignment and communication with the two second upper tank portions respectively, and the two third lower tank portions are in alignment and communication with the two third upper tank portions respectively; the two ends of the coating tank are in communication with the regions enclosed by the corresponding third upper tank portion and the corresponding third lower tank portion respectively.

[0011] In one embodiment, the first upper tank portion and the upper accommodating tank are arranged along the length direction of the coating upper die respectively, and the first upper tank portion and the upper accommodating tank are arranged in parallel and at intervals; the first lower tank portion and the lower accommodating tank are arranged along the length direction of the coating lower die respectively, and the first lower tank portion and the lower accommodating tank are arranged in parallel and at intervals.

[0012] In one embodiment, each of the second upper tank portions and the first upper tank portion forms a first upper stepped portion; and each of the second lower tank portions and the first lower tank portion forms a first lower stepped portion.

[0013] In one embodiment, each of the second upper tank portions and the corresponding third upper tank portion forms a second upper stepped portion; and each of the second lower tank portions and the corresponding third lower tank portion forms a second lower stepped portion.

[0014] In one embodiment, the coating roller comprises a roller body and two flow guide columns respectively mounted at two ends of the roller body; the coating groove is arranged on the roller body in the axial direction, and each of the flow guide columns communicates the liquid storage tank with the coating groove.

[0015] In one embodiment, each of the flow guide columns extends into the region enclosed by the corresponding third upper tank portion and the corresponding third lower tank portion.

[0016] In one embodiment, the cross section of each of the third upper tank portions is a semicircular structure matched with the corresponding flow guide column; and the cross section of each of the third lower tank portions is a semicircular structure matched with the corresponding flow guide column.

[0017] In one embodiment, a liquid injection channel is arranged on the coating upper die, one end of the liquid injection channel is provided with the liquid injection nozzle, and the other end of the liquid injection channel is in communication with the upper liquid storage tank.

[0018] In one embodiment, the coating upper mold base is provided with an upper mounting hole, and the coating lower mold base is provided with a lower mounting hole, and the lower mounting hole is arranged in alignment with the upper mounting hole.

[0019] The coating die provided by the embodiment of the present application has at least the following beneficial effects: the present application can inject the coating liquid into the liquid reservoir formed by the upper liquid reservoir and the lower liquid reservoir through the liquid injection nozzle; by connecting the two ends of the coating tank to the two ends of the liquid reservoir respectively, the coating liquid in the liquid reservoir can flow into the coating tank. By rotating the coating roller in the area formed by the upper accommodating tank and the lower accommodating tank, the coating die rotates during the coating process, and the coating liquid flowing out of the coating tank can adhere to the substrate, which helps to improve the fluid stability of the coating liquid, thereby improving the uniformity of the coating. Moreover, the rotating coating roller does not have an external tooth-shaped cavity structure, which can reduce damage to the substrate and improve the coating quality and accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or exemplary technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0021] Figure 1 A schematic structural diagram of a coating die head provided in an embodiment of the present application;

[0022] Figure 2 This is an exploded schematic diagram of the coating die provided in the embodiment of the present application;

[0023] Figure 3 A schematic structural diagram of the coating upper mold base provided in an embodiment of the present application;

[0024] Figure 4 for Figure 3 A magnified schematic diagram of point A in the middle;

[0025] Figure 5 A schematic structural diagram of the coating lower die base provided in an embodiment of the present application;

[0026] Figure 6 for Figure 5 A magnified schematic diagram of point B in the middle;

[0027] Figure 7 A schematic diagram of the partial structure of the coating roller provided in an embodiment of the present application.

[0028] Among them, the main marks of the drawings in the figure are:

[0029] 1, coating upper die base; 11, upper liquid storage tank; 111, first upper groove part; 112, second upper groove part; 113, third upper groove part; 12, upper accommodating groove; 13, liquid injection nozzle; 14, first upper step part; 15, second upper step part; 16, liquid injection channel; 17, upper mounting hole;

[0030] 2, coating lower die base; 21, lower liquid storage tank; 211, first lower groove part; 212, second lower groove part; 213, third lower groove part; 22, lower accommodating groove; 23, first lower step part; 24, second lower step part; 25, lower mounting hole;

[0031] 3, coating roller; 31, coating groove; 32, roller body; 33, flow guide column. DETAILED DESCRIPTION

[0032] In order to make the technical problems to be solved by the present application, the technical solutions and beneficial effects clearer, the present application will be further described in detail below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not intended to limit the present application.

[0033] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0034] In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second", "third" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly and specifically limited. The meaning of "several" is one or more, unless otherwise explicitly and specifically limited.

[0035] In the description of the present application, it should be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0036] In the description of the application, it should be explained that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0037] Throughout the specification, reference to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. Therefore, the phrases "in one embodiment" or "in some embodiments" appearing in various places throughout the specification are not all referring to the same embodiment. In addition, in one or more embodiments, specific features, structures, or characteristics can be combined in any suitable manner.

[0038] Please refer to Figure 1 and Figure 2 , the coating die provided by the embodiment of the application will be described. The coating die comprises a coating upper die seat 1, a coating lower die seat 2 and a coating roller 3. In combination with Figure 3 and Figure 4 , the coating upper die seat 1 is provided with an upper liquid storage groove 11 and an upper accommodating groove 12 in communication with the upper liquid storage groove 11; the coating upper die seat 1 is provided with a liquid injection nozzle 13 in communication with the upper liquid storage groove 11. In combination with Figure 5 and Figure 6 , the coating lower die seat 2 is provided with a lower liquid storage groove 21 and a lower accommodating groove 22 in communication with the lower liquid storage groove 21, and the lower liquid storage groove 21 and the upper liquid storage groove 11 form a liquid storage groove. The liquid storage groove can be used to accommodate the coating liquid. The coating roller 3 is in the form of a cylinder, and the coating roller 3 is rotatably installed in the area surrounded by the upper accommodating groove 12 and the lower accommodating groove 22. In combination with Figure 7 , the coating roller 3 is provided with a coating groove 31 along its circumference, and the two ends of the coating groove 31 are in communication with the two ends of the liquid storage groove, respectively. Through the liquid injection nozzle 13, the coating liquid can be injected into the liquid storage groove formed by the upper liquid storage groove 11 and the lower liquid storage groove 21; by connecting the two ends of the coating groove 31 with the two ends of the liquid storage groove, respectively, the coating liquid in the liquid storage groove can flow into the coating groove 31. By rotatably installing the coating roller 3 in the area surrounded by the upper accommodating groove 12 and the lower accommodating groove 22, the coating die rotates during the coating process, and the coating liquid flowing out of the coating groove 31 can adhere to the substrate, which helps to improve the fluid stability of the coating liquid, thereby improving the uniformity of the coating. Moreover, the rotatably arranged coating roller 3 has no external tooth-shaped cavity structure, thereby reducing damage to the substrate and improving the coating quality and precision.

[0039] In one embodiment, please refer to 4 and Figure 6 As a specific embodiment of the coating die provided by the present application, the upper liquid storage tank 11 includes a first upper tank portion 111, two second upper tank portions 112 and two third upper tank portions 113. The two second upper tank portions 112 are respectively located at two ends of the first upper tank portion 111. Each second upper tank portion 112 communicates the first upper tank portion 111 with a corresponding third upper tank portion 113. Each third upper tank portion 113 communicates a corresponding second upper tank portion 112 with the upper accommodating tank 12. The liquid injection nozzle 13 communicates with the first upper tank portion 111. The lower liquid storage tank 21 includes a first lower tank portion 211, two second lower tank portions 212 and two third lower tank portions 213. The first lower tank portion 211 is in alignment with the first upper tank portion 111. The two second lower tank portions 212 are respectively located at two ends of the first lower tank portion 211. The two second lower tank portions 212 are respectively in alignment with the two second upper tank portions 112. The two third lower tank portions 213 are respectively in alignment with the two third upper tank portions 113. Each second lower tank portion 212 communicates the first lower tank portion 211 with a corresponding third lower tank portion 213. Each third lower tank portion 213 communicates a corresponding second lower tank portion 212 with the lower accommodating tank 22. The two ends of the coating tank 31 are respectively in communication with the regions formed by the corresponding third upper tank portion 113 and the corresponding third lower tank portion 213. In this structure, the coating liquid entering from the liquid injection nozzle 13 can flow into the region formed by the first upper tank portion 111 and the first lower tank portion 211, the region formed by the two second upper tank portions 112 and the two second lower tank portions 212, the region formed by the two third upper tank portions 113 and the two third lower tank portions 213, and finally into the coating tank 31, and then flow out of the coating tank 31 to realize the coating operation. The multiple regions can guide the flow of the coating liquid, effectively control the rate and precision of coating, and thus improve the coating efficiency and precision, which helps to improve the uniformity of film formation.

[0040] In one embodiment, please refer to Figure 4 and Figure 6As a specific embodiment of the coating die provided by the present application, the first upper groove part 111 and the upper accommodating groove 12 are respectively arranged along the length direction of the coating upper die base 1, and the first upper groove part 111 is arranged in parallel and spaced apart from the upper accommodating groove 12; the first lower groove part 211 and the lower accommodating groove 22 are respectively arranged along the length direction of the coating lower die base 2, and the first lower groove part 211 is arranged in parallel and spaced apart from the lower accommodating groove 22. Specifically, each second upper groove part 112 is perpendicular to the first upper groove part 111, and each third upper groove part 113 is perpendicular to the corresponding second upper groove part 112 and arranged in parallel and spaced apart from the first upper groove part 111. Each second lower groove part 212 is perpendicular to the first lower groove part 211, and each third lower groove part 213 is perpendicular to the corresponding second lower groove part 212 and arranged in parallel and spaced apart from the first lower groove part 211. With this structure, the area enclosed by the two second upper groove parts 112 and the two second lower groove parts 212, and the area enclosed by the two third upper groove parts 113 and the two third lower groove parts 213, can realize the transition and drainage of the coating liquid, and change the flow direction of the coating liquid, thereby improving the coating speed and precision.

[0041] In one embodiment, the volume of the area enclosed by the first upper groove part 111 and the first lower groove part 211 is greater than the volume of the area enclosed by the two second upper groove parts 112 and the two second lower groove parts 212, and the volume of the area enclosed by the two second upper groove parts 112 and the two second lower groove parts 212 is greater than the volume of the area enclosed by the two third upper groove parts 113 and the two third lower groove parts 213. With this structure, the coating liquid gradually flows from the area with a large volume into the area with a small volume, thereby controlling the flow rate of the coating liquid, and further controlling the coating speed.

[0042] In one embodiment, referring to Figure 4 and Figure 6 As a specific embodiment of the coating die provided by the present application, a first upper step part 14 is formed between each second upper groove part 112 and the first upper groove part 111; and a first lower step part 23 is formed between each second lower groove part 212 and the first lower groove part 211. With this structure, the coating liquid flowing from the first upper groove part 111 into the two second upper groove parts 112 can be resisted by the two first upper step parts 14, so as to limit the flow rate of the coating liquid. Similarly, the coating liquid flowing from the first lower groove part 211 into the two second lower groove parts 212 can be resisted by the two first lower step parts 23, so as to limit the flow rate of the coating liquid. In this way, the coating liquid can be resisted and limited by the two first upper step parts 14 and the two first lower step parts 23, thereby controlling the coating speed of the coating liquid, and further improving the coating quality and precision.

[0043] In one embodiment, referring to Figure 4 and Figure 6As a specific embodiment of the coating die provided by the embodiment of the present application, a second upper step portion 15 is formed between each second upper groove portion 112 and the corresponding third upper groove portion 113; and a second lower step portion 24 is formed between each second lower groove portion 212 and the corresponding third lower groove portion 213. With this structure, the coating liquid flowing from the two second upper groove portions 112 into the two third upper groove portions 113 can be resisted by the two second upper step portions 15, so that the flow rate of the coating liquid can be limited. Similarly, the coating liquid flowing from the two second lower groove portions 212 into the two third lower groove portions 213 can be resisted by the two second lower step portions 24, so that the flow rate of the coating liquid can be limited. In this way, the coating liquid can be resisted and limited twice by the two second upper step portions 15 and the two second lower step portions 24, so that the coating rate of the coating liquid can be controlled, and the coating quality and precision can be further improved.

[0044] In one embodiment, referring to Figure 7 As a specific embodiment of the coating die provided by the embodiment of the present application, the coating roller 3 comprises a roller body 32 and two flow guide columns 33 respectively installed at two ends of the roller body 32; the roller body 32 is provided with a coating groove 31 along the axial direction thereof, and each flow guide column 33 communicates the liquid storage groove with the coating groove 31. With this structure, the coating liquid in the liquid storage groove can flow into the coating groove 31 through the two flow guide columns 33, and the two flow guide columns 33 can play a role of guiding the flow of the coating liquid.

[0045] In one embodiment, referring to Figure 4 , Figure 6 and Figure 7 As a specific embodiment of the coating die provided by the embodiment of the present application, each flow guide column 33 extends into the area enclosed by the corresponding third upper groove portion 113 and the corresponding third lower groove portion 213. With this structure, the area enclosed by each third upper groove portion 113 and the corresponding third lower groove portion 213 can limit and resist the corresponding flow guide column 33, so that the rotation of the coating roller 3 can be limited, and the position deviation of the coating roller 3 during rotation can be avoided, thereby affecting the coating quality.

[0046] In one embodiment, referring to Figure 4 and Figure 6 As a specific embodiment of the coating die provided by the embodiment of the present application, the cross section of each third upper groove portion 113 is a semicircular structure matched with the corresponding flow guide column 33; and the cross section of each third lower groove portion 213 is a semicircular structure matched with the corresponding flow guide column 33. With this structure, each third upper groove portion 113 can be enclosed with the corresponding third lower groove portion 213 to form an area for inserting the corresponding flow guide column 33, and the cross section of the area can be circular, so as to be matched with the flow guide column 33, thereby reducing the position deviation of the flow guide column 33 during rotation.

[0047] In one embodiment, referring toFigure 3 As a specific embodiment of the coating die provided by the present application, the coating upper die holder 1 is provided with a liquid injection channel 16, one end of the liquid injection channel 16 is provided with a liquid injection nozzle 13, and the other end of the liquid injection channel 16 is in communication with the upper liquid storage groove 11. The liquid injection channel 16 can be arranged at the middle position of the coating upper die holder 1, that is, one end of the liquid injection channel 16 can be located at the middle position of the first upper groove part 111, so that the uniform consistency of the coating liquid at the left and right ends of the upper liquid storage groove 11 can be improved. Through the liquid injection channel 16, the liquid injection nozzle 13 can be in communication with the first upper groove part 111 of the upper liquid storage groove 11. After the liquid injection nozzle 13 is in communication with the coating liquid supply device, the coating liquid can flow into the upper liquid storage groove 11 through the liquid injection nozzle 13 and the liquid injection channel 16, and the liquid injection channel 16 can play a role in guiding the flow of the coating liquid.

[0048] In one embodiment, referring to Figure 3 and Figure 5 As a specific embodiment of the coating die provided by the present application, the coating upper die holder 1 is provided with an upper mounting hole 17, the coating lower die holder 2 is provided with a lower mounting hole 25, and the lower mounting hole 25 is arranged in position with the upper mounting hole 17. The upper mounting hole 17 and the lower mounting hole 25 can be screw holes or threaded holes. Through fasteners such as screws and bolts, the upper mounting hole 17 and the lower mounting hole 25 can be locked and fixed, and the detachable connection of the coating upper die holder 1 and the coating lower die holder 2 can be achieved. Specifically, the number of upper mounting holes 17 can be multiple, and the multiple upper mounting holes 17 are arranged at intervals along the length direction of the coating upper die holder 1. Correspondingly, the number of lower mounting holes 25 can be multiple, and the number of lower mounting holes 25 is the same as the number of upper mounting holes 17, and the multiple lower mounting holes 25 are arranged at intervals along the length direction of the coating lower die holder 2, and the multiple lower mounting holes 25 are arranged in position with the multiple upper mounting holes 17. Through the cooperation of the multiple upper mounting holes 17 and the multiple lower mounting holes 25, the connection strength between the coating upper die holder 1 and the coating lower die holder 2 can be improved.

[0049] The above only describes optional embodiments of the present application and does not limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A coating die characterized by, The application relates to a coating device. The coating device comprises a coating upper die base, a coating lower die base, and a coating roller. The coating upper die base is provided with an upper liquid storage groove and an upper accommodating groove in communication with the upper liquid storage groove, and is provided with a liquid injection nozzle in communication with the upper liquid storage groove. The coating lower die base is provided with a lower liquid storage groove and a lower accommodating groove in communication with the lower liquid storage groove, and the lower liquid storage groove and the upper liquid storage groove form a liquid storage groove for accommodating coating liquid.

2. The coating die of claim 1, wherein: The coating roller is rotatably arranged in a region surrounded by the upper accommodating groove and the lower accommodating groove, and is provided with a coating groove along the axial direction of the coating roller.

3. The coating die of claim 2, wherein: The upper liquid storage groove comprises a first upper groove part, two second upper groove parts arranged at the two ends of the first upper groove part respectively, and third upper groove parts in communication with the second upper groove parts and the upper accommodating groove.

4. The coating die of claim 2, wherein: The lower liquid storage groove comprises a first lower groove part in communication with the first upper groove part, two second lower groove parts arranged at the two ends of the first lower groove part respectively, and third lower groove parts in communication with the second lower groove parts and the lower accommodating groove.

5. The coating die of claim 2, wherein: The two second lower groove parts are in communication with the two second upper groove parts respectively, and the two third lower groove parts are in communication with the two third upper groove parts respectively.

6. The coating die of claim 2, wherein: The two ends of the coating groove are in communication with the regions surrounded by the corresponding third upper groove parts and the corresponding third lower groove parts respectively.

7. The coating die of claim 6, wherein: The first upper groove part and the upper accommodating groove are arranged along the length direction of the coating upper die base respectively, and the first upper groove part and the upper accommodating groove are arranged in parallel and at intervals.

8. The coating die of claim 6, wherein: The first lower groove part and the lower accommodating groove are arranged along the length direction of the coating lower die base respectively, and the first lower groove part and the lower accommodating groove are arranged in parallel and at intervals.

9. The coating die of any one of claims 1-8, wherein: The second upper groove parts and the first upper groove part form first upper stepped parts respectively. The second lower groove parts and the first lower groove part form first lower stepped parts respectively. The second upper groove parts and the corresponding third upper groove parts form second upper stepped parts respectively. The second lower groove parts and the corresponding third lower groove parts form second lower stepped parts respectively. The coating roller comprises a roller body and two flow guide columns arranged at the two ends of the roller body respectively. The roller body is provided with the coating groove along the axial direction of the roller body, and the flow guide columns are in communication with the liquid storage groove and the coating groove. The flow guide columns extend into the regions surrounded by the corresponding third upper groove parts and the corresponding third lower groove parts. The third upper groove parts have a semicircular structure matched with the corresponding flow guide columns. The third lower groove parts have a semicircular structure matched with the corresponding flow guide columns. The coating upper die base is provided with a liquid injection channel, one end of the liquid injection channel is provided with the liquid injection nozzle, and the other end of the liquid injection channel is in communication with the upper liquid storage groove.

10. The coating die of any one of claims 1-8, wherein: The upper coating die holder is provided with an upper mounting hole, and the lower coating die holder is provided with a lower mounting hole, which is arranged in alignment with the upper mounting hole.

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