Micro-gravure coating device and micro-gravure coating system

Abstract

The utility model belongs to the technical field of coating equipment, and discloses a micro-gravure coating device and a micro-gravure coating system.The micro-gravure coating device comprises a coating roller, and the coating roller comprises at least one reticulate pattern section and smooth roller sections located at the two ends of each reticulate pattern section in the axial direction of the coating roller; the film pressing mechanism is provided with a film pressing body; in the axial direction perpendicular to the coating roller, at least part of the projection of the film pressing body is located within the range of the reticulate pattern section and used for pressing at least the part, close to the edge of the first coating, of the base material on the surface of the reticulate pattern section, and the first coating is a coating arranged on the side, facing the coating roller, of the base material. According to the scheme, the quality of re-coating at the edge of the coated coating on the base material can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of coating equipment, and in particular relates to a micro-concave coating device and a micro-concave coating system. Background Art

[0002] As an important secondary battery, lithium-ion batteries have the advantages of light weight, high energy density, long cycle life and high safety performance, and have become the mainstream battery.

[0003] As the demand for energy density of lithium-ion batteries continues to increase, lithium-ion batteries are also developing from liquid batteries to semi-solid batteries and solid-state batteries. Among them, the liquid batteries, semi-solid batteries, and solid-state batteries mentioned here depend on the form of their electrolytes. Batteries using liquid electrolytes are liquid batteries, batteries using solid electrolytes are solid-state batteries, and batteries with electrolytes between liquid and solid are semi-solid batteries.

[0004] In the production process of semi-solid-state batteries and solid-state batteries, it is necessary to first coat the active material layer on the current collector, and then coat the electrolyte layer on the active material layer. Since the electrolyte layer is coated after the active material layer is formed on the current collector, Figure 1 As shown in the figure, there is a height difference between the edge of the active material layer and the current collector, and during the coating process, the current collector is pulled and its edge has a certain tension, so that the current collector outside the active material layer has a large width D2 (the current collector represented by the dotted line) suspended above the coating roller, resulting in poor coating quality of the electrolyte layer in this area and even coating omissions. Utility Model Content

[0005] The utility model provides a micro-concave coating device and a micro-concave coating system, which can at least improve the quality of re-coating at the edge of a coated coating on a substrate.

[0006] In a first aspect, the present invention provides a dimple coating device, comprising:

[0007] A coating roller, wherein the coating roller comprises at least one textured segment and smooth roller segments located at both ends of each textured segment along the axial direction of the coating roller;

[0008] A film pressing mechanism, wherein the film pressing mechanism has a film pressing body; in the axial direction perpendicular to the coating roller, the projection of the film pressing body is at least partially located within the range of the anilox segment, and is used to press at least the portion of the substrate close to the edge of the first coating layer onto the surface of the anilox segment, wherein the first coating layer is a coating provided on the side of the substrate facing the coating roller.

[0009] As an implementation method, the lamination mechanism includes a back roller, and along the axial direction of the back roller, the back roller includes a first diameter section and a second diameter section that are alternately arranged, and the diameter of the first diameter section is larger than the diameter of the second diameter section;

[0010] The die-cast body includes the first diameter section.

[0011] As an implementation manner, in the axial direction of the back roller, the length of the first diameter section is smaller than the length of the smooth roller section.

[0012] As an implementation method, two first diameter segments are provided within the range of the smooth roller segment between two adjacent anilox segments.

[0013] As an implementation manner, the film pressing mechanism includes a plurality of rollers spaced apart along the axial direction of the coating roller, and the film pressing body includes the rollers.

[0014] As an implementation manner, in the axial direction of the coating roller, the width of the roller is smaller than the length of the smooth roller segment.

[0015] As an implementable manner, two rollers are provided between two adjacent mesh segments, and each roller is provided in one-to-one correspondence with an end portion of each mesh segment.

[0016] As an implementable manner, the laminating mechanism includes a support member, a plurality of linear drives are arranged on the support member at intervals along the axial direction of the coating roller, each of the linear drives is located on the side of the support member facing the coating roller, the driving directions of each linear drive are parallel to each other and perpendicular to the axis of the coating roller, and each linear drive rotates toward one end of the coating roller to connect to the roller; or,

[0017] The lamination mechanism includes a support member, and at least one linear drive is provided on the side of the support member facing away from the coating roller. The driving direction of the linear drive is perpendicular to the axis of the coating roller, and each roller is rotatably matched with the support member.

[0018] As an implementable manner, two coating rollers are arranged in parallel, and the anilox segments of one coating roller are arranged alternately with the anilox segments of the other coating roller.

[0019] As an achievable method, each of the anilox segments includes at least two anilox sleeves arranged side by side along the axial direction of the coating roller, and the outer periphery of each anilox sleeve is provided with an anilox pattern, and each of the smooth roller segments includes at least two circular sleeves arranged side by side along the axial direction of the coating roller.

[0020] In a second aspect, the present invention provides a dimple coating system, comprising two coating devices, wherein the two coating devices are the two different dimple coating devices mentioned above.

[0021] The above solution, by providing a film pressing body to press the portion of the substrate near the edge of the first coating layer against the surface of the anvil segment, can reduce the risk of a large width of the substrate outside the first coating layer floating above the coating roller due to the height difference between the substrate and the first coating layer and the tension on the substrate, leading to poor coating quality or even coating omissions when re-coating this area. Furthermore, in this solution, when the portion of the substrate near the edge of the first coating layer is pressed against the surface of the anvil segment, only the extremely small width D1 of the substrate near the edge of the first coating layer is prevented from attaching to the anvil segment. Due to the small size of the portion not attached to the anvil segment, the coating material absorbed by the anvil segment can still fill this area. Therefore, a good quality coating can be obtained when re-coating is performed on the edge of the first coating layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Other features, objects and advantages of the present application will become more apparent upon reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0023] Figure 1 This is a comparison diagram of the bending of the current collector at the first coating boundary in the embodiment of the utility model and the related art.

[0024] Figure 2 A schematic diagram of a dimple coating device according to an embodiment of the present invention;

[0025] Figure 3 To correspond to Figure 2 Exploded view of the dimple coating device in operation;

[0026] Figure 4 A schematic diagram of a dimple coating device according to another embodiment of the present invention;

[0027] Figure 5 To correspond to Figure 2 Exploded view of the dimple coating device in operation;

[0028] Figure 6 A schematic diagram of a micro-dimpled coating device provided by another embodiment of the present invention having two coating rollers;

[0029] Figure 7 A schematic diagram of a dimple coating system provided in an embodiment of the present invention;

[0030] Figure 8 This is a schematic diagram of a dimple coating system according to another embodiment of the present invention.

[0031] Description of reference numerals:

[0032] Coating roller 1, anilox section 11, smooth roller section 12, back roller 2, first diameter section 21, second diameter section 22, scraper 3, open material trough 4, liquid inlet 41, overflow port 42, closed material trough 43, current collector 5, film pressing mechanism 6, roller 61, linear drive 62, support member 63, approach roller 7, unwinding device 101, pressure rollers 102, 105, oven 103, support roller 104, winding device 106, film pressing body 107, width D1, D2. DETAILED DESCRIPTION

[0033] The present application will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the relevant utility model and are not intended to limit the utility model. It should also be noted that, for ease of description, only the portions relevant to the utility model are shown in the accompanying drawings.

[0034] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0035] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The singular forms "a," "the," and "the" used in this application and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.

[0036] like Figure 2 、 Figure 3 As shown, the embodiment of the present invention provides a micro-dimpled coating device, comprising:

[0037] The coating roller 1 includes, along the axial direction of the coating roller 1 , at least one anilox segment 11 and smooth roller segments 12 located at both ends of each anilox segment 11 .

[0038] in, Figure 3 In the example shown, two anilox segments 11 and three smooth roller segments 12 are provided along the axial direction of the coating roller 1, and the anilox segments 11 and the smooth roller segments 12 are alternately provided. In other examples, other numbers of the anilox segments 11 and the smooth roller segments 12 may also be provided.

[0039] The circumferential surface of the patterned segment 11 is provided with a pattern. The pattern may be, but is not limited to, a diamond-shaped, straight-line, S-shaped, or regular hexagonal shape. Micro-grooves are formed between the patterns to accommodate the material to be coated. The pattern of the aforementioned shape can be formed by engraving the surface of the coating roller 1 to remove material.

[0040] Generally, the shape and size of the mesh can be set according to the properties of the slurry (coated medium) to be coated, such as viscosity. Generally, the lower the viscosity of the slurry, the higher the density of the mesh setting and the smaller the mesh size, so as to effectively obtain the slurry from the trough.

[0041] In this example, taking the preparation of a pole piece of a secondary battery as an example, the substrate is the current collector, and the first coating is the positive electrode active material layer or the negative electrode active material layer.

[0042] In other examples, the substrate may be a polymer material film or the like.

[0043] In the example of preparing a secondary battery electrode, the coating roller 1 rotates continuously during operation. The roller reaches the feed trough, where the slurry adheres to the roller's surface. As the adhered slurry continues to rotate, the scraper 3 removes any excess slurry from the roller's surface. For example, it removes all slurry from the smooth roller segment 12 and the outer surface of the textured segment 11, leaving only the slurry within the microgrooves between the textures. After the excess slurry is removed, when the coating roller 1 contacts the current collector 5 (the printed carrier), the slurry adhered to the textured segment 11 is transferred to the current collector 5, forming a corresponding coating. This slurry is the electrolyte slurry.

[0044] In this example, the material trough used is an open material trough 4 , and a liquid inlet 41 is provided at the lower part of the open material trough 4 , and an overflow port 42 is provided at the upper part.

[0045] In order to ensure that the current collector 5 near the edge of the first coating layer can be in good contact with the coating roller 1 to improve the coating quality, the present solution also provides a film pressing mechanism, which has a film pressing body 107; in the axial direction of the coating roller 1, the film pressing body 107 is at least partially located within the range of the mesh segment 11; that is, during the coating process, the film pressing body 107 applies pressure to a portion of the current collector 5 within the range of the mesh segment 11, so as to at least press the portion of the substrate (current collector 5) near the edge of the first coating layer onto the surface of the mesh segment 11. The first coating layer is a coating that has been provided on the side of the substrate facing the coating roller 1. The provided coating layer may be, but is not limited to, a positive electrode active material layer or a negative electrode active material layer.

[0046] The above scheme, at least see also Figure 1By providing a film pressing body 107 to press the portion of the substrate (current collector 5) near the edge of the first coating layer against the surface of the textured segment 11, this reduces the risk of a large width of the substrate outside the first coating layer floating above the coating roller 1 due to the height difference between the substrate and the first coating layer and the tension on the substrate. This can lead to poor coating quality or even coating omissions in this area during subsequent coating. Furthermore, in this embodiment, when the portion of the substrate near the edge of the first coating layer is pressed against the surface of the textured segment 11, only a very small width D1 of the substrate near the edge of the first coating layer is prevented from attaching to the textured segment. Since the area not attached to the textured segment is small, the coating material adsorbed in the textured segment 11 can still fill this area. Therefore, a high-quality coating can be obtained when the edge of the first coating layer is re-coated. This ensures that the first coating layer completely covers the subsequent coating layer, specifically, the positive electrode active material layer or the negative electrode active material layer, which covers the subsequently applied solid electrolyte 51.

[0047] When more than two anilox segments 11 are provided, the anilox segments 11 can adhere to the slurry during coating, and the current collector 5 corresponding to the anilox segments 11 will be coated with the slurry, and the slurry adhered to the surface of the smooth roller segment 12 will be scraped off by the scraper 3, and there will be no slurry on the current collector 5 corresponding to the smooth roller segment 12. Therefore, after coating, an interval coating will be formed on the current collector 5.

[0048] As an implementable method, the film pressing mechanism includes a back roller 2, and along the axial direction of the back roller 2, the back roller 2 includes a first diameter segment 21 and a second diameter segment 22 that are alternately arranged, and the diameter of the first diameter segment 21 is larger than the diameter of the second diameter segment 22; the film pressing body 107 includes the first diameter segment 21.

[0049] That is to say, the back roller 2 adopts a stepped shaft structure.

[0050] When the back roller 2 adopts a stepped shaft, the steering direction of the coating roller 1 can be opposite to that of the back roller 2, and the steering direction of the coating roller 1 is consistent with the transmission direction of the current collector 5 for forward coating; the steering direction of the coating roller 1 can also be the same as that of the back roller 2, and the steering direction of the coating roller 1 is opposite to the transmission direction of the current collector 5 for reverse coating.

[0051] The large-diameter shaft segment - the first diameter segment 21 acts as a film pressing body 107, pressing the current collector 5 onto the coating roller 1 during the coating process. In addition, since a small-diameter second diameter segment 22 is provided between the two large-diameter first diameter segments 21, after a coating (electrode material layer 52, which can be a positive electrode active material layer or a negative electrode active material layer) has been provided on the back of the surface to be coated with the current collector 5, the coating can be located in the area corresponding to the second diameter segment 22, which can avoid the reduction in the flatness of the surface to be coated due to the height difference on the back of the current collector 5. By providing the second diameter segment 22, it is equivalent to providing a groove corresponding to the coating on the back of the current collector 5. The coating on the back of the current collector 5 is located in the groove and will not be pressed by the back roller 2 toward the coating roller 1. Therefore, it can avoid the coating on the back of the current collector 5 from having an adverse effect on subsequent coating. When the solid electrolyte 51 is subsequently coated on the front of the current collector 5, good coating performance is achieved, ensuring uniformity and consistency of the coating. Generally, the width of the solid electrolyte 51 is greater than that of the electrode material layer 52. In this example, the edge of the solid electrolyte 51 exceeds the edge of the electrode material layer 52, and the distance is 1mm-3mm, so that when the electrode sheets prepared by the coating are stacked, the electrode material layer 52 can cover the range of the solid electrolyte 51 to prevent poor electrical properties.

[0052] Generally, the diameter of the first diameter section 21 is 60 μm-140 μm larger than the diameter of the second diameter section 22 , that is, the depth of the groove for accommodating the back coating of the current collector 5 is 30 μm-70 μm.

[0053] In addition, the diameter of the first diameter section 21 can be the same as the diameter of the coating roller 1 or slightly different. For example, but not limited to, the diameter difference between the two can be within the range of ±5mm. The values here are only for example and are not the only limitation of this application.

[0054] As an implementation method, in the axial direction of the backing roller 2 , the length of the first diameter section 21 is smaller than the length of the smooth roller section 12 .

[0055] As an implementation method, two first diameter sections 21 are provided within the range of the smooth roller section 12 between two adjacent anilox sections 11 .

[0056] By arranging two first diameter segments 21 within the range of each smooth roller segment 12, and the ends of each first diameter segment 21 and its adjacent anilox segment 11 are arranged in the same plane, the collectors 5 at both ends of each anilox segment 11 are pressurized by the corresponding first diameter segments 21, that is, a smaller width of pressure surface is used for the collectors 5 at both ends of the anilox segment 11, and the pressure is uniform, thereby avoiding wrinkles, deformation, etc. on the collector 5 when pressure is applied to the collector 5 by a first diameter segment 21 with a length consistent with the length of the smooth roller segment 12 within the entire smooth roller segment 12, thereby avoiding affecting the coating quality.

[0057] As an implementation, see also Figure 4 、 Figure 5 As shown, the film pressing mechanism 6 includes a plurality of rollers 61 spaced apart along the axial direction of the coating roller 1 , and the film pressing body 107 includes the rollers 61 .

[0058] During coating, pressure is applied to the current collector 5 at both ends of the mesh segment 11 by the roller 61 .

[0059] The diameter of the roller 61 is smaller than that of the coating roller 1 .

[0060] In the technical solution of applying pressure to the current collector 5 using the roller 61 , the coating roller 1 is turned in the opposite direction to the conveying direction of the current collector 5 to perform reverse coating.

[0061] In the technical solution of applying pressure to the current collector 5 using the roller 61 , approach rollers 7 are respectively provided upstream and downstream of the film pressing mechanism.

[0062] As an implementation method, in the axial direction of the coating roller 1 , the width of the roller 61 is smaller than the length of the smooth roller segment 12 .

[0063] As an implementable manner, two rollers 61 are provided between two adjacent mesh segments 11 , and each roller 61 is provided in one-to-one correspondence with the end of each mesh segment 11 , that is, each end of each mesh segment 11 is uniquely provided with a corresponding roller 61 .

[0064] By uniquely arranging a roller 61 at each end of the mesh segment 11, the current collectors 5 at both ends of each mesh segment 11 are pressurized by the corresponding rollers 61, that is, a smaller width pressure surface is used for the current collectors 5 at both ends of the mesh segment 11, and the pressure is uniform, thereby avoiding wrinkles, deformation, etc. on the current collectors 5 when a larger width roller 61 is used to apply pressure to the current collectors 5 between two adjacent mesh segments 11, thereby avoiding affecting the coating quality.

[0065] As an achievable method, the laminating mechanism 6 includes a support member 63, and a plurality of linear drives 62 are arranged on the support member 63 at intervals along the axial direction of the coating roller 1. Each of the linear drives 62 is located on the side of the support member 63 facing the coating roller 1. The driving directions of each linear drive 62 are parallel to each other and perpendicular to the axis of the coating roller 1. Each linear drive 62 rotates toward one end of the coating roller 1 to connect to the roller 61.

[0066] In this example, the distance between the roller 61 and the smooth roller segment 12 is independently adjusted by a linear drive 62 provided in one-to-one correspondence with each roller 61 .

[0067] In another example, at least one linear drive 62 can be used to simultaneously adjust the distance between each roller 61 and the coating roller 1. Specifically, the laminating mechanism includes a support member 63, and at least one linear drive 62 is provided on the side of the support member 63 facing away from the coating roller 1. The driving direction of the linear drive 62 is perpendicular to the axis of the coating roller 1, and each of the rollers 61 rotates in coordination with the support member 63.

[0068] By setting up a linear drive 62, the distance between the roller 61 and the smooth roller segment 12 can be adjusted to adapt to the coating of collectors 5 of different thicknesses. In addition, by adjusting the distance between the roller 61 and the smooth roller segment 12, the pressure applied by the roller 61 to the collector 5 can be controlled so that the pressure is within a reasonable range to ensure the quality of the coating.

[0069] The linear drive 62 may be a pneumatic cylinder, a hydraulic cylinder, an electric push rod or a screw transmission mechanism.

[0070] As an implementation, see also Figure 6 As shown, it comprises two parallel coating rollers 1 , wherein the anilox segments 11 of one coating roller 1 are staggered with the anilox segments 11 of the other coating roller 1 .

[0071] By setting two coating rollers 1 and staggering the anilox segments 11 of the two coating rollers 1, at least two different slurry coatings can be completed simultaneously; for example, one coating roller 1 is used to coat one slurry, and the other coating roller 1 coats another slurry between the coating layers coated by the previous coating roller 1, that is, coating another slurry in the uncoated area of the previous coating roller 1.

[0072] As an achievable method, each of the anilox segments 11 includes at least two anilox sleeves arranged side by side along the axial direction of the coating roller 1, and the outer periphery of each anilox sleeve is provided with an anilox pattern. Each of the smooth roller segments 12 includes at least two circular sleeves arranged side by side along the axial direction of the coating roller 1.

[0073] The number of the textured sleeves and round sleeves on the coating roller 1 can be adjusted according to actual conditions to change the length of the textured segment 11 and the length of the smooth roller segment 12 to meet the coating requirements of different coating widths and coating spacings.

[0074] For example, if the width of the coating needs to be increased, the number of anilox sleeves in the corresponding anilox segment 11 is increased, otherwise, the number of anilox sleeves is reduced; correspondingly, if the distance between the two coatings needs to be increased, the number of circular sleeves in the smooth roller segment 12 is increased, otherwise, the number of circular sleeves is reduced.

[0075] Second, see also Figure 7 or Figure 8 As shown, the utility model provides a micro-concave coating system, including two coating devices, and the two coating devices are the two different micro-concave coating devices mentioned above.

[0076] The main difference between the two different dimple coating devices is that one uses a stepped shaft back roller for the lamination mechanism, while the other uses a roller 61. In the roller 61 embodiment, the coating roller 1 can use either an open trough 4 or a closed trough 43. The detailed structure of the dimple coating device is described above and will not be repeated here.

[0077] like Figure 7 As shown, in the exemplary micro-concave coating system, a unwinding device 101 is included. After the current collector 5 comes out of the unwinding device, it passes through at least one reversing roller and is rolled by a pair of pressure rollers 102. After being coated by any one of the above-mentioned two micro-concave coating devices, it enters the oven 103 for drying. A support roller 104 is provided in the oven 103 to support the coated current collector. After drying, the current collector is rolled by another pair of pressure rollers 105 and then rolled by the winding device 106.

[0078] In this example, both of the two dimple coating devices use an open trough 4 .

[0079] like Figure 8 As shown, in this example, it is Figure 7 The main difference between the examples is that the micro-concave coating device using the roller solution adopts a closed material trough 43, while the micro-concave coating device using the back roller solution adopts an open material trough 4.

[0080] It should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like used above to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0081] The above description is merely a preferred embodiment of the present application and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of the utility model disclosed in this application is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the inventive concept. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A micro-dimpled coating device, characterized in that: include: A coating roller (1), wherein along the axial direction of the coating roller (1), the coating roller (1) comprises at least one anilox segment (11) and smooth roller segments (12) located at both ends of each anilox segment (11); A film pressing mechanism, the film pressing mechanism having a film pressing body (107); in an axial direction perpendicular to the coating roller (1), the projection of the film pressing body is at least partially located within the range of the anilox segment (11), and is used to press at least a portion of the substrate close to the edge of a first coating layer onto the surface of the anilox segment (11), wherein the first coating layer is a coating provided on the side of the substrate facing the coating roller (1).

2. The micro-dimpled coating device according to claim 1, characterized in that The film pressing mechanism comprises a back roller (2), and along the axial direction of the back roller (2), the back roller (2) comprises a first diameter section (21) and a second diameter section (22) arranged alternately, and the diameter of the first diameter section (21) is larger than the diameter of the second diameter section (22); The die-cast body (107) includes the first diameter section (21).

3. The dimple coating device according to claim 2, wherein: In the axial direction of the back roller (2), the length of the first diameter section (21) is smaller than the length of the smooth roller section (12).

4. The dimple coating device according to claim 2 or 3, characterized in that: Two first diameter sections (21) are provided within the range of the smooth roller section (12) between two adjacent anilox sections (11).

5. The dimple coating device according to claim 1, wherein: The film pressing mechanism (6) comprises a plurality of rollers (61) spaced apart along the axial direction of the coating roller (1), and the film pressing body (107) comprises the rollers (61).

6. The dimple coating device according to claim 5, characterized in that: In the axial direction of the coating roller (1), the width of the roller (61) is smaller than the length of the smooth roller segment (12).

7. The dimple coating device according to claim 6, wherein: Two rollers (61) are provided between two adjacent mesh segments (11), and each roller (61) is provided in one-to-one correspondence with an end portion of each mesh segment (11).

8. The dimple coating device according to any one of claims 5 to 7, characterized in that: The laminating mechanism (6) includes a support member (63), a plurality of linear drivers (62) are arranged on the support member (63) at intervals along the axial direction of the coating roller (1), each of the linear drivers (62) is located on the side of the support member (63) facing the coating roller (1), the driving directions of each linear driver (62) are parallel to each other and perpendicular to the axis of the coating roller (1), and each linear driver (62) is connected to the roller (61) by rotating toward one end of the coating roller (1); or, The laminating mechanism includes a support member (63), and at least one linear drive (62) is provided on the side of the support member (63) facing away from the coating roller (1). The driving direction of the linear drive (62) is perpendicular to the axis of the coating roller (1), and each of the rollers (61) rotates in conjunction with the support member (63).

9. The dimple coating device according to any one of claims 1 to 3 and 5 to 7, characterized in that: It comprises two coating rollers (1) arranged in parallel, wherein the anilox segments (11) of one coating roller (1) and the anilox segments (11) of the other coating roller (1) are arranged in an alternating manner.

10. The dimple coating device according to any one of claims 1 to 3 and 5 to 7, characterized in that: Each of the anilox segments (11) comprises at least two anilox sleeves arranged side by side along the axial direction of the coating roller (1), and the outer periphery of each anilox sleeve is provided with an anilox pattern. Each of the smooth roller segments (12) comprises at least two circular sleeves arranged side by side along the axial direction of the coating roller (1).

11. A dimple coating system, characterized in that: It comprises two coating devices, one of which is the micro-concave coating device according to any one of claims 2 to 4, and the other is the micro-concave coating device according to any one of claims 5 to 8.

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