Coating device

Abstract

The utility model relates to a coating device. The coating device comprises a coating mechanism which comprises two coating units, each coating unit comprises a coating roller, and a coating channel is formed between the two coating rollers; and the blade coating mechanism is arranged below the coating mechanism and comprises two blade coating units, each blade coating unit comprises a blade coating roller, and a blade coating channel is formed between the two blade coating rollers. Compared with the prior art that the coatings on the surfaces of the two sides of the base material belt are formed through coating in two successive coating procedures, the coating device can form the coatings on the two sides of the base material belt through coating in the same coating procedure, and therefore it is guaranteed that coating, curing and the like of the coatings on the two sides of the base material belt are conducted synchronously; the difference of the coatings on the two sides of the base material belt is reduced as much as possible, so that the interface resistance of the composite diaphragm is reduced, and the performance of the composite diaphragm is improved.

Description

Technical Field

[0001] This application relates to the field of alkaline water electrolysis technology, specifically a coating device. Background Technology

[0002] Currently, hydrogen energy is considered a major strategic direction for global energy and power transformation, attracting widespread attention from countries worldwide. At present, the main sources of hydrogen are fossil fuels such as natural gas and coal, and the production process still emits large amounts of carbon dioxide. Hydrogen produced by water electrolysis is considered "green hydrogen" and is seen as the ultimate direction for hydrogen production. Among water electrolysis hydrogen production technologies, alkaline water electrolysis technology is currently the most mature. Generally, a diaphragm is installed in the alkaline water electrolyzer to prevent the interdiffusion of hydrogen and oxygen, while allowing the permeation of hydroxide ions and water.

[0003] The quality of the membrane directly affects the hydrogen production performance of the electrolyzer. After multiple technological iterations, composite membranes are widely recognized as the future direction for upgrading membrane materials in alkaline electrolyzers. The manufacturing process of composite membranes involves coating both sides of the substrate sequentially. This results in the coating and curing processes on both sides of the substrate being completed in different steps, leading to significant differences in the coatings on both sides. This, in turn, increases the interfacial resistance of the membrane material and severely affects the performance of the composite membrane. Utility Model Content

[0004] Therefore, it is necessary to provide a coating device that can avoid increasing the interfacial resistance of the membrane material and improve the performance of the composite membrane, in order to address the above problems.

[0005] A coating apparatus, comprising:

[0006] A coating mechanism includes two coating units, each coating unit including a coating roller, and a coating channel forming between the two coating rollers; and

[0007] The coating mechanism is arranged below the coating mechanism and includes two coating units, each of which includes a coating roller, and a coating channel is formed between the two coating rollers.

[0008] In some embodiments, each of the coating units further includes a slurry bin, and a portion of the roller surface of the coating roller is located within the slurry bin.

[0009] In some embodiments, each of the coating units further includes a first position adjustment assembly, on which the coating roller is mounted.

[0010] In some embodiments, each of the first position adjustment components includes a first drive member and a first adjustment seat, the first adjustment seat being mounted on the drive end of the first drive member, and the coating roller being disposed on the first adjustment seat.

[0011] In some embodiments, each of the coating units further includes a second position adjustment assembly, on which the coating roller is mounted.

[0012] In some embodiments, each of the second position adjustment components includes a second drive member and a second adjustment seat, the second adjustment seat being mounted on the drive end of the second drive member, and the coating roller being disposed on the second adjustment seat.

[0013] In some embodiments, the coating mechanism further includes a position adjustment unit, with both coating units mounted on the position adjustment unit.

[0014] In some embodiments, the coating apparatus further includes a roller mechanism located below the coating mechanism, the roller mechanism comprising two opposing rollers that abut against each other.

[0015] In some embodiments, the roller mechanism is provided as a plurality of roller mechanisms, which are arranged at intervals along the vertical direction.

[0016] In some embodiments, the coating apparatus further includes a suction mechanism comprising two suction nozzles located above the two coating rollers and extending between the two coating rollers.

[0017] In some embodiments, the two coating rollers are staggered in the vertical direction.

[0018] In actual use, the aforementioned coating apparatus allows the base material strip to pass through the coating channel and the scraping channel sequentially from top to bottom. In the coating channel, two coating rollers apply the slurry to both sides of the base material strip, ensuring a coating layer is formed on both surfaces. In the scraping channel, two scraping rollers remove excess slurry from both sides of the base material strip, ensuring the coating thickness on both sides is the set value.

[0019] Compared with the prior art where the coatings on both sides of the base material strip are formed in two consecutive coating processes, the coating apparatus in this application can form coatings on both sides of the base material strip in the same coating process, thereby ensuring that the coating and curing of the coatings on both sides of the base material strip are carried out simultaneously, minimizing the difference between the coatings on both sides of the base material strip, thereby reducing the interfacial resistance of the composite diaphragm and improving the performance of the composite diaphragm. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the coating apparatus in one embodiment of this application;

[0021] Figure 2 for Figure 1The diagram shows the structure of the coating device's doctor blade roller and nozzle. Detailed Implementation

[0022] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0023] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0025] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0026] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0027] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0028] Please see Figure 1 and Figure 2 This application provides a coating apparatus for coating a slurry onto both sides of a base material strip A to form a composite membrane consisting of the base material strip A and coatings on both sides of the base material strip A. The coating apparatus includes a coating mechanism 30 and a scraping mechanism 40. The coating mechanism 30 includes two coating units 31, each including a coating roller 311. A coating channel C is formed between the two coating rollers 311 for the base material strip A to pass through from top to bottom, and the two coating rollers 311 coat the two sides of the base material strip A with slurry respectively. The scraping mechanism 40 is arranged below the coating mechanism 30 and includes two scraping units 41. Each scraping unit 41 includes a scraping roller 411, and a scraping channel D is formed between the two scraping rollers 411 (see...). Figure 2 After the base material belt A is coated through the coating channel C, it passes through the scraping channel D from top to bottom. When the base material belt A passes through the scraping channel D, the two scraping rollers 411 scrape off the excess slurry B on both sides of the base material belt A.

[0029] It should be noted that the two coating rollers 311 can rotate in opposite directions under the drive of a motor or other rotary drive component, thereby allowing the base material belt A wrapped around the two coating rollers 311 to be smoothly conveyed downwards. Similarly, the two doctor blade rollers 411 can also rotate in opposite directions under the drive of a motor or other rotary drive component, thereby allowing the base material belt A wrapped around the two doctor blade rollers 411 to be smoothly conveyed downstream.

[0030] In actual use, the coating apparatus described above allows the base material belt A to pass through the coating channel C and the scraper channel D from top to bottom. At coating channel C, two coating rollers 311 apply slurry to both sides of the base material belt A, ensuring that a coating is formed on both sides. At scraper channel D, two scraper rollers 411 scrape away excess slurry B from both sides of the base material belt A, ensuring that the coating thickness on both sides of the base material belt A is the set value.

[0031] Compared with the prior art where the coatings on both sides of the base material strip A are formed in two consecutive coating processes, the coating apparatus in this application can form coatings on both sides of the base material strip A in the same coating process. This ensures that the coating and curing of the coatings on both sides of the base material strip A are carried out simultaneously, minimizing the difference between the coatings on both sides of the base material strip A, thereby reducing the interfacial resistance of the composite membrane and improving the performance of the composite membrane.

[0032] Specifically, in this embodiment, the coating rollers 311 of the two coating units 31 are staggered vertically. That is, the two coating rollers 311 are not aligned with each other, with one coating roller 311 positioned slightly above the other, resulting in a certain amount of misalignment in the vertical direction. Thus, the base material strip A first passes over one coating roller 311 and then over the other, which helps to increase the contact area between the base material strip A and the coating roller 311, thereby improving the coating quality.

[0033] In a specific embodiment, the coating apparatus further includes a main drive mechanism 10 and a guide roller 20. The main drive mechanism 10 is used to pull the base material belt A toward the guide roller 20. The guide roller 20 is located above the coating mechanism 30 and is used for the base material belt A to pass around, so that the base material belt A is turned and conveyed to the coating mechanism 30 after passing around the guide roller 20. In this way, the speed at which the base material belt A is pulled toward the guide roller 20 can be adjusted by the main drive mechanism 10, thereby adjusting the tension of the base material belt A passing through the coating mechanism 30 and the doctor blade coating mechanism 40.

[0034] It is understandable that the roller 20 can rotate around its own axis, so that the base material belt A passing through the roller 20 can be conveyed downstream, avoiding damage caused by friction between the base material belt A and the roller 20.

[0035] Specifically, the main drive mechanism 10 includes two drive rollers 11, which are arranged opposite to each other and together clamp the base material belt A passing between them. Both drive rollers 11 can rotate around their own axes, with one being the driving roller and the other the driven roller. Thus, in actual use, controlling the rotation of the driving roller causes the driven roller to rotate in the opposite direction, while simultaneously using friction to transport the base material belt A between the two drive rollers 11 towards the feed roller 20. Of course, in other embodiments, both drive rollers 11 can be driving rollers, as long as they can transport the base material belt A between them towards the feed roller 20; this is not limited here. It is understood that a motor or other rotary drive component can be used to drive the driving roller to rotate, as long as it can achieve the goal of driving the driving roller to rotate; this is not limited here.

[0036] It should be noted that the tension of the base material belt A passing through the coating mechanism 30 and the scraper mechanism 40 can be adjusted by controlling the rotational speed of the drive roller 11, ensuring that the tension of the base material belt A passing through the coating mechanism 30 and the scraper mechanism 40 remains at a preset value or fluctuates within a sufficiently small range. For example, when the rotational speed of the drive roller 11 increases, the speed at which the base material belt A is pulled to the overroller 20 increases, thereby reducing the tension of the base material belt A passing through the coating mechanism 30 and the scraper mechanism 40; when the rotational speed of the drive roller 11 decreases, the speed at which the base material belt A is pulled to the overroller 20 decreases, thereby increasing the tension of the base material belt A passing through the coating mechanism 30 and the scraper mechanism 40.

[0037] In the embodiments of this application, each coating unit 31 further includes a slurry bin 313 for storing slurry. A portion of the roller surface of the coating roller 311 is located within the slurry bin 313, so that during the rotation of the coating roller 311 around its own axis, the slurry in the slurry bin 313 can adhere to the roller surface of the coating roller 311, thereby transferring the adhered slurry to the base material belt A at the position where the coating roller 311 contacts the base material belt A, i.e., coating the base material belt A. It should be noted that a rotating drive component such as a motor can be used to drive the coating roller 311 to rotate.

[0038] Furthermore, the amount of slurry adhering to the coating roller 311 can be adjusted by regulating the rotational speed of the coating roller 311. For example, when the rotational speed of the coating roller 311 increases, the amount of slurry adhering to the coating roller 311 decreases; when the rotational speed of the coating roller 311 decreases, the amount of slurry adhering to the coating roller 311 increases.

[0039] Optionally, the coating roller 311 can be an anilox roller, meaning that the roller surface of the coating roller 311 has an anilox structure. This anilox structure can increase the amount of slurry adhering to the coating roller 311. Thus, coating rollers 311 with different anilox structures will have different amounts of slurry adhering to them during coating, so a suitable coating roller 311 can be selected according to process requirements.

[0040] In a specific embodiment, each coating unit 31 further includes a first position adjustment component 315, on which the coating roller 311 is mounted. Thus, the position of the coating roller 311 is adjusted using the first position adjustment component 315, thereby adjusting the relative position of the two coating rollers 311 to ensure a better coating effect. Specifically, the first position adjustment component 315 drives the coating roller 311 to adjust its position along a preset horizontal direction. This preset horizontal direction is... Figure 1 The left and right directions are shown.

[0041] Furthermore, each first position adjustment component 315 includes a first driving member (not shown) and a first adjustment seat (not shown). The first adjustment seat is mounted on the driving end of the first driving member, and the coating roller 311 is disposed on the first adjustment seat. The first driving member is used to drive the first adjustment seat to move, thereby the first adjustment seat drives the coating roller 311 thereon to move, that is, to adjust the position of the coating roller 311.

[0042] Optionally, the first driving component includes a first motor, a first lead screw, and a first lead screw nut. The output shaft of the first motor is fixedly connected to the first lead screw, enabling the first motor to drive the first lead screw to rotate around its own axis. The first lead screw nut is threaded onto the first lead screw, allowing the first lead screw nut to move axially along the first lead screw when the first lead screw rotates. The first lead screw nut is fixedly connected to a first adjusting seat, allowing the first adjusting seat to move together with the first lead screw nut, thereby driving the coating roller 311 on it to move together, thus achieving position adjustment of the coating roller 311. It should be noted that the first driving component is not limited to this. In other embodiments, the first driving component can also adopt other linear drive modules, as long as they can drive the coating roller 311 to perform position adjustment through the first adjusting seat, which is not limited here.

[0043] In the embodiments of this application, each coating unit 41 further includes a second position adjustment component 413. The coating roller 411 is mounted on the second position adjustment component 413, so that the second position adjustment component 413 can drive the coating roller 411 to adjust its position in a direction closer to or farther from the other coating roller 411, thereby achieving the purpose of adjusting the gap between the two coating rollers 411 and ensuring that the coating thickness on both sides of the base material strip A passing through the coating channel D between the two coating rollers 411 meets the process requirements.

[0044] Furthermore, each second position adjustment assembly 413 includes a second driving member and a second adjustment seat. The second adjustment seat is mounted on the driving end of the second driving member, and the coating roller 411 is disposed on the second adjustment seat. The second driving member is used to drive the second adjustment seat to move, thereby the second adjustment seat drives the coating roller 411 thereon to move, that is, to adjust the position of the coating roller 411.

[0045] Optionally, the second driving component includes a second motor, a second lead screw, and a second lead screw nut. The output shaft of the second motor is fixedly connected to the second lead screw, enabling the second motor to drive the second lead screw to rotate around its own axis. The second lead screw nut is threaded onto the second lead screw, allowing the second lead screw nut to move circumferentially along the second lead screw when the second lead screw rotates. The second lead screw nut is fixedly connected to a second adjusting seat, allowing the second adjusting seat to move together with the second lead screw nut, thereby driving the coating roller 411 on it to move together, thus achieving position adjustment of the coating roller 411. It should be noted that the second driving component is not limited to this. In other embodiments, the second driving component can also adopt other linear drive modules, as long as they can drive the coating roller 411 to perform position adjustment through the second adjusting seat, which is not limited here.

[0046] In the embodiments of this application, the coating mechanism 40 further includes a position adjustment unit 42. Both coating units 41 are mounted on the position adjustment unit 42, so that the position adjustment unit 42 can drive the coating rollers 411 of the two coating units 41 and the second position adjustment assembly 413 as a whole to adjust their positions, so as to ensure that the base material strip A passes through the two coating rollers 411 in a vertical state and is located at the center of the two coating rollers 411.

[0047] Preferably, the coating rollers 411 of the two coating units 41 are spaced apart from each other along a preset horizontal direction, which is perpendicular to the base material strip A. The position adjustment unit 42 can drive the two coating units 41 to adjust their positions along the preset horizontal direction, thereby ensuring that the base material strip A passes vertically between the two coating rollers 411 and that the base material strip A is located at the center of the two coating rollers 411.

[0048] Furthermore, the position adjustment unit 42 includes a third driving member and a third adjusting seat. The third adjusting seat is mounted on the driving end of the third driving member, and both scraping units 41 are mounted on the third adjusting seat. The third driving member is used to drive the third adjusting seat to move, thereby causing the two scraping units 41 on the third adjusting seat to move, thus realizing the adjustment of the position of the two scraping units 41.

[0049] Optionally, the third driving component includes a third motor, a third lead screw, and a third lead screw nut. The output shaft of the third motor is fixedly connected to the third lead screw, enabling the third motor to drive the third lead screw to rotate around its own axis. The third lead screw nut is threaded onto the third lead screw, allowing the third lead screw nut to move circumferentially along the third lead screw when the third lead screw rotates. The third lead screw nut is fixedly connected to a third adjusting seat, allowing the third adjusting seat to move together with the third lead screw nut, thereby driving the two scraping units 41 on it to move together, thus achieving position adjustment of the two scraping units 41. It should be noted that the third driving component is not limited to this. In other embodiments, the third driving component can also adopt other linear drive modules, as long as they can drive the two scraping units 41 to perform position adjustment through the third adjusting seat. This is not limited here.

[0050] It should be noted that when the base material belt A passes between the two coating rollers 411, the two coating rollers 411 scrape off the excess slurry B on both sides of the base material belt A. The excess slurry B scraped off by the two coating rollers 411 will accumulate at the entrance of the coating channel D between the two coating rollers 411. In order to avoid the accumulation of excess slurry B affecting the coating quality, in this embodiment, a suction mechanism 60 is used to remove the accumulated excess slurry B. Specifically, the suction mechanism 60 includes two suction nozzles 61, which are located on the upper side of the two coating rollers 411 and extend between the two coating rollers 411. The two suction nozzles 61 are used to remove the slurry accumulated at the entrance of the coating channel D (the two suction nozzles 61 respectively remove the excess slurry B located on both sides of the base material belt A), thereby avoiding the accumulation of excess slurry B from adversely affecting the coating quality.

[0051] Specifically, both suction nozzles 61 are connected to an external negative pressure source through pipelines, thereby generating negative pressure at the two suction nozzles 61. The two suction nozzles 61 use this negative pressure to suck up the accumulated excess slurry B.

[0052] In embodiments of this application, the coating apparatus further includes a roller mechanism 50 located below the scraping mechanism 40. The roller mechanism 50 includes two opposing rollers 51 that abut against each other, thereby clamping the uncoated area of ​​the substrate material belt A. This serves two purposes: firstly, it fixes the substrate material belt A, preventing it from shaking and negatively impacting the coating quality; secondly, it prevents the rollers 51 from contacting the coating layer of the substrate material belt A, thus avoiding damage to the coating.

[0053] It should be noted that the base material belt A includes the coating area to be coated and the uncoated area. When the base material belt A passes through the two coating rollers 311, the two coating rollers 311 contact both sides of the coating area of ​​the base material belt A, thereby coating both sides of the coating area. When the base material belt A passes through the two doctor rollers 411, the two doctor rollers 411 contact both sides of the coating area of ​​the base material belt A, thereby scraping away excess slurry from both sides of the coating area. When the base material belt A passes between the two counter rollers 51, the two counter rollers 51 contact both sides of the uncoated area of ​​the base material belt A and clamp the base material belt A together to prevent vibration of the base material belt A between the passing roller 20 and the counter roller mechanism 50, which helps improve coating quality.

[0054] Understandably, both rollers 51 of the roller mechanism 50 can rotate around their own axes, so that the base material belt A can pass smoothly between the two rollers 51 of the roller mechanism 50 and continue to be conveyed downstream.

[0055] Furthermore, the roller mechanism 50 can be adjusted in position along the aforementioned preset horizontal direction to ensure that the base material strip A located between the coating mechanism 30 and the roller mechanism 50 is in a vertical state. It should be noted that the position adjustment of the roller mechanism 50 can be achieved by a manual adjustment mechanism or by an automatic adjustment mechanism, and no special limitation is made here.

[0056] Furthermore, multiple roller mechanisms 50 are configured, which are arranged at intervals along the vertical direction. Each roller mechanism 50 uses its own roller 51 to simultaneously clamp the uncoated area of ​​the base material belt A, making the base material belt A more stable and preventing vibration of the base material belt A between the roller 20 and the roller mechanism 50, thereby further improving the coating quality. Specifically... Figure 1 In the illustrated embodiment, the number of roller mechanisms 50 is three. Of course, in other embodiments, the number of roller mechanisms 50 may be two, four, or five, etc., and no special limitation is made here.

[0057] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0058] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A coating apparatus, characterized in that, include: The coating mechanism (30) includes two coating units (31), each of the coating units (31) including a coating roller (311), and a coating channel (C) is formed between the two coating rollers (311); and The coating mechanism (40) is arranged below the coating mechanism (30) and includes two coating units (41), each of which includes a coating roller (411), and a coating channel (D) is formed between the two coating rollers (411).

2. The coating apparatus according to claim 1, characterized in that, Each of the coating units (31) further includes a slurry bin (313), and a portion of the roller surface of the coating roller (311) is located within the slurry bin (313).

3. The coating apparatus according to claim 1, characterized in that, Each of the coating units (31) further includes a first position adjustment assembly (315), on which the coating roller (311) is mounted.

4. The coating apparatus according to claim 3, characterized in that, Each of the first position adjustment components (315) includes a first drive member and a first adjustment seat, the first adjustment seat being mounted on the drive end of the first drive member, and the coating roller (311) being disposed on the first adjustment seat.

5. The coating apparatus according to claim 1, characterized in that, Each of the coating units (41) further includes a second position adjustment assembly (413), on which the coating roller (411) is mounted.

6. The coating apparatus according to claim 5, characterized in that, Each of the second position adjustment components (413) includes a second drive member and a second adjustment seat, the second adjustment seat being mounted on the drive end of the second drive member, and the coating roller (411) being disposed on the second adjustment seat.

7. The coating apparatus according to claim 1, characterized in that, The coating mechanism (40) further includes a position adjustment unit (42), and both coating units (41) are mounted on the position adjustment unit (42).

8. The coating apparatus according to claim 1, characterized in that, The coating apparatus further includes a roller mechanism (50) located below the coating mechanism (40), the roller mechanism (50) including two rollers (51) arranged opposite each other, the two rollers (51) abutting each other.

9. The coating apparatus according to claim 8, characterized in that, The roller mechanism (50) is configured as a plurality of roller mechanisms (50), which are arranged at intervals in the vertical direction.

10. The coating apparatus according to claim 1, characterized in that, The coating apparatus further includes a suction mechanism (60), which includes two suction nozzles (61), which are located on the upper side of the two coating rollers (411) and extend between the two coating rollers (411).

11. The coating apparatus according to claim 1, characterized in that, The two coating rollers (311) are staggered in the vertical direction.

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