Coating micro-concave roller and coating device

Abstract

The utility model belongs to the technical field of coating device, disclose a coating micro -concave roll and coating device. Among them, the coating micro -concave roll includes spindle and coating roll, and the coating roll includes roll body and the coating layer that coats in the outer circumferential wall of roll body, and the outer circumferential wall of coating layer is recessed with multiple net cell groups, and multiple net cell groups are along the axial distribution of coating roll, and every net cell group includes multiple single net cell of same volume that are along the circumferential distribution of coating roll, and multiple net cell groups are divided into two net cell sets by the middle position of coating roll axial, and the volume of single net cell in every net cell set gradually reduces along the middle of the axial of coating roll to both ends. Adopt this coating micro -concave roll can effectively promote the quality of the functional film layer formed on the base material, and can effectively alleviate the problem that the edge area of both ends of the base material coated is prone to curling.

Description

Technical Field

[0001] This utility model relates to the field of coating equipment technology, and in particular to coating micro-grooves and coating equipment. Background Technology

[0002] Coating technology refers to the process of using a coating device to apply fluids such as paste polymers, molten polymers, or polymer melts onto the surface of substrates such as paper, cloth, or plastic films, and then drying them in an oven or curing them with ultraviolet light to form a functional film layer on the substrate.

[0003] Among them, the coating micro-grooving roller is an important component of the coating device, used to coat fluid onto the substrate. Although the coating micro-grooving roller in the current related technology can achieve the coating function, due to the tension of the substrate during unwinding, the functional film layer formed by the coating micro-grooving roller is prone to the phenomenon that the middle area is thinner and the edge areas at both ends are thicker along the axial direction of the coating micro-grooving roller. This leads to the problem of edge curling at both ends of the coated substrate. Utility Model Content

[0004] The purpose of this invention is to provide a coating micro-grooved roller and a coating device to solve the aforementioned problems existing in coating micro-grooved rollers in related technologies.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] Coating micro-grooved rollers, including:

[0007] spindle;

[0008] A coating roller includes a roller body and a coating layer coated on the outer peripheral wall of the roller body. The roller body is fixedly sleeved on the outer periphery of a main shaft. The outer peripheral wall of the coating layer is recessed with multiple cell groups. The multiple cell groups are spaced apart along the axial direction of the coating roller. Each cell group includes multiple individual cells of the same volume spaced apart along the circumferential direction of the coating roller. The multiple cell groups are divided into two cell sets at the middle position of the axial direction of the coating roller. From the middle to the two ends of the axial direction of the coating roller, the volume of the individual cells in each cell set gradually decreases.

[0009] As an alternative to the above-mentioned coating micro-grooved roller, in each set of cells, 1.5 ≤ Vmax / Vmin ≤ 3;

[0010] Where Vmax is the volume of the largest single hole in the hole set, in μm. 3 Vmin is the volume of the smallest single cell in the cell set, in μm. 3 .

[0011] As an alternative to the aforementioned coating micro-grooved roller, in each of the aforementioned cell sets, 75μm 3 ≤Vmax≤900μm 3 50μm 3 ≤Vmin≤300μm 3 .

[0012] As an alternative to the above-mentioned coating micro-grooved roller, in each set of cells, |dh / dx|≤1.5μm / mm;

[0013] Wherein, dh is the depth difference between two individual cells spaced along the axial direction of the coating roller in the cell set, in μm; dx is the spacing between two individual cells spaced along the axial direction of the coating roller in the cell set, in mm.

[0014] As an alternative to the above-mentioned coating micro-grooved roller, in each set of cells, 0.9μm / mm≤|dh / dx|≤1.2μm / mm.

[0015] As an alternative to the above-mentioned coating micro-grooved roller, when the coating roller is unfolded into a planar structure, the cross-sectional shape of the individual cell perpendicular to its own depth direction is triangular, rhomboid, or rectangular.

[0016] As an alternative to the above-mentioned coating micro-grooved roller, in each set of cells, |dw / dx|≤2μm / mm;

[0017] Wherein, dw is the difference in diameter of the circumscribed circle of the cross-section of two individual cells spaced apart along the axial direction of the coating roller when the coating roller is unfolded into a planar structure, in μm; dx is the distance between two individual cells spaced apart along the axial direction of the coating roller in the cell set, in mm.

[0018] As an alternative to the above-mentioned coating micro-grooved roller, in each set of cells, 1μm / mm≤|dw / dx|≤1.2μm / mm.

[0019] As an alternative to the aforementioned coating micro-grooved roller, for each individual cell, 0.6 ≤ h / W ≤ 0.9;

[0020] Where h is the depth of the individual cell, in μm; W is the circumscribed circle diameter of the cross-section of the individual cell perpendicular to its depth direction when the coating roller is unfolded into a planar structure, in μm.

[0021] The coating apparatus includes the aforementioned coating micro-grooved roller.

[0022] The beneficial effects of this utility model are:

[0023] This invention provides a coating micro-grooved roller and a coating device. The coating micro-grooved roller includes a main shaft and a coating roller. The coating roller includes a roller body and a coating layer applied to the outer peripheral wall of the roller body. The roller body is fixedly sleeved on the outer periphery of the main shaft. The outer peripheral wall of the coating layer has multiple sets of cells recessed into it. These sets of cells are spaced apart along the axial direction of the coating roller. Each set of cells includes multiple individual cells of the same volume spaced apart along the circumferential direction of the coating roller. The multiple sets of cells are divided into two cell clusters at the middle position along the axial direction of the coating roller. From the middle to both ends along the axial direction of the coating roller, the volume of the individual cells in each cell cluster gradually decreases.

[0024] By setting multiple cell groups, the coating roller is divided into two cell sets at the middle position along its axial direction. The volume of individual cells in each cell set gradually decreases from the middle to both ends of the coating roller's axial direction. It can be understood that the individual cell volume in the two cell sets located at the two ends of the coating roller's axial direction is the smallest, and the amount of coating liquid that can be transferred by each individual cell is the least. Conversely, the individual cell volume in the cell set located at the middle position of the coating roller's axial direction is the largest, and the amount of coating liquid that can be transferred by each individual cell is the greatest. Therefore, when the functional film layer is coated onto a substrate under unwinding tension using this micro-concave coating roller, the thickness of the functional film layer formed near the two ends of the substrate along the axial direction of the coating roller is reduced compared to existing technologies, while the thickness of the functional film layer formed near the middle position of the substrate is increased compared to existing technologies. This results in smaller thickness deviations in the final functional film layer formed along the axial direction of the coating roller, effectively improving the quality of the functional film layer formed on the substrate and effectively alleviating the problem of edge curling at both ends of the coated substrate. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the coating micro-grooved roller provided in a specific embodiment of the present invention from a first viewing angle;

[0026] Figure 2 This is a schematic diagram of the coating micro-grooved roller provided in a specific embodiment of the present invention from a second perspective.

[0027] In the picture:

[0028] 1. Spindle;

[0029] 2. Coating roller; 21. Roller body; 22. Coating layer; 221. Individual cell; 222. Non-working area. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0031] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0033] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0034] This utility model provides a coating micro-grooved roller, such as Figure 1 and Figure 2As shown, the coating micro-grooved roller includes a main shaft 1 and a coating roller 2. The coating roller 2 includes a roller body 21 and a coating layer 22 coated on the outer peripheral wall of the roller body 21. The roller body 21 is fixedly sleeved on the outer periphery of the main shaft 1. The outer peripheral wall of the coating layer 22 is recessed with multiple cell groups. The multiple cell groups are distributed at intervals along the axial direction of the coating roller 2. Each cell group includes multiple individual cells 221 of the same volume distributed at intervals along the circumference of the coating roller 2. The multiple cell groups are divided into two cell sets at the middle position of the axial direction of the coating roller 2. Along the axial direction of the coating roller 2 from the middle to the two ends, the volume of the individual cells 221 in each cell set gradually decreases.

[0035] By setting multiple cell groups, the coating roller 2 is divided into two cell sets at the middle position along its axial direction. From the middle to both ends of the coating roller 2's axial direction, the volume of individual cells 221 in each cell set gradually decreases. It can be understood that the individual cell 221 in the two cell sets located at the two ends of the coating roller 2's axial direction has the smallest volume, and the amount of coating liquid that can be transferred by each individual cell 221 is the least. Conversely, the individual cell 221 in the cell set located at the middle position of the coating roller 2's axial direction has the largest volume, and the amount of coating liquid that can be transferred by each individual cell 221 is the most. This results in… When the functional film layer is coated onto the substrate under unwinding tension using the coating micro-concave roller, the thickness of the functional film layer formed on the substrate near both ends along the axial direction of the coating roller 2 is reduced compared to the prior art, while the thickness of the functional film layer formed on the substrate near the middle position is increased compared to the prior art. This results in a smaller thickness deviation of the functional film layer formed at various points along the axial direction of the coating roller 2, which can effectively improve the quality of the functional film layer formed on the substrate and effectively alleviate the problem of edge curling at both ends of the coated substrate.

[0036] Specifically, the roller body 21 is fixedly sleeved on the main shaft 1 by integral molding, welding, or key connection. Individual cells 221 are formed on the outer periphery of the coating layer 22 by laser engraving.

[0037] Specifically, in this embodiment, the coating layer 22 is a ceramic layer coated on the outer peripheral wall of the roller body 21. It is understood that the formed ceramic layer is a hollow cylinder. The surface of the ceramic layer is smooth and has low friction, which effectively reduces the risk of damage to the substrate when it comes into contact with the ceramic layer, thereby further ensuring the quality of the coated product. Secondly, the ceramic layer has advantages such as low water absorption, high temperature resistance, corrosion resistance, and wear resistance, which can effectively improve the service life of the coated micro-grooved roller. In other embodiments, the coating layer 22 can also be adapted to the actual application scenario of the coated micro-grooved roller, such as a hard alloy coating, a rubber coating, or a stainless steel coating.

[0038] Specifically, such as Figure 1 and Figure 2As shown, the two ends of the main shaft 1 are located on the outer sides of the two ends of the coating roller 2, forming a rotating connection. It can be understood that the axial directions of the main shaft 1, the coating roller 2, the roller body 21, and the coating layer 22 are all parallel.

[0039] Optionally, in this embodiment, as Figure 1 and Figure 2 As shown, along the axial direction of the coating roller 2, from the middle to both ends, the spacing between multiple cell groups in each cell set gradually increases to further control the gradient change of the material load on the coating roller 2, thereby further improving the quality of the functional film layer formed on the substrate. In other embodiments, the multiple cell groups in each cell set may also be uniformly spaced along the axial direction of the coating roller 2. In other embodiments, in each cell set, the spacing between at least one adjacent cell group may be different from the spacing between any other adjacent cell group.

[0040] Optionally, considering the ease of machining and volume control of the coating micro-grooved roller, when the coating roller 2 is unfolded into a planar structure, the cross-sectional shape of the individual cavity 221 perpendicular to its own depth direction is triangular, rhomboid, or rectangular. Further, depending on actual working conditions, the cross-sectional shape of the individual cavities 221 perpendicular to their own depth direction in at least one adjacent cavity group within each cavity set can be set to be different, or the cross-sectional shape of the individual cavities 221 perpendicular to their own depth direction in each cavity group within each cavity set can be adaptively set to be the same, depending on actual working conditions. In this embodiment, as... Figure 1 and Figure 2 As shown, in an exemplary configuration, each cell 221 on the coating roller 2 has a rhomboid cross-sectional shape perpendicular to its depth direction.

[0041] Optionally, in each set of holes, 1.5 ≤ Vmax / Vmin ≤ 3. Where Vmax is the volume of the largest single hole 221 in the set, in μm. 3 Vmin is the volume of the smallest single cell 221 in the cell set, in μm. 3 .

[0042] Along the axial direction of coating roller 2, from the middle to both ends, a volumetric gradient that is too small has little effect on improving the problem of edge curling at both ends of the coated substrate, while a volumetric gradient that is too large can lead to excessive thickness deviation of the functional film layer between the middle and end areas of the coated substrate. Therefore, by setting 1.5≤Vmax / Vmin≤3 in each cell set, the impact of excessively small and large volumetric gradients on coating quality is reduced, further improving the quality of the functional film layer formed on the substrate. Here, 1.5≤Vmax / Vmin≤3 is an empirical range obtained from extensive previous experiments.

[0043] Further, optionally, considering the versatility of the coating micro-grooved roller, in each cell set, 75μm 3 ≤Vmax≤900μm 3 50μm 3 ≤Vmin≤300μm 3 This further reduces the impact of excessively small or large volume gradients on coating quality, and further improves the quality of the functional film layer formed on the substrate. Specifically, 75μm... 3 ≤Vmax≤900μm 3 50μm 3 ≤Vmin≤300μm 3 These ranges are all derived from extensive prior experiments. For example, in some embodiments, Vmax is set to 220 μm. 3 Vmin = 100μm 3 .

[0044] Optionally, in each cell set, |dh / dx| ≤ 1.5 μm / mm. Here, dh is the depth difference (μm) between two individual cells 221 spaced along the axial direction of the coating roller 2 in the cell set; dx is the spacing (mm) between two individual cells 221 spaced along the axial direction of the coating roller 2. Along the axial direction of the coating roller 2, from the middle to both ends, under the same volume change gradient, an excessively small depth gradient results in low flow resistance of the coating liquid between adjacent cell sets, but also leads to poor roller surface strength of the coating layer 22, affecting its service life. An excessively large depth gradient results in high flow resistance of the coating liquid between adjacent cell sets, and stress concentration is prone to occur at abrupt changes in volume gradient, making the formed functional film layer susceptible to visible wavy defects. Therefore, both excessively large and small values ​​are detrimental to overcoming the influence of substrate unwinding tension, thus affecting coating quality. Therefore, setting |dh / dx| ≤ 1.5 μm / mm effectively improves the stability and reliability of the smooth transition of the coating liquid from shallower to deeper areas, thereby further enhancing the quality of the functional film layer formed on the substrate. Here, |dh / dx| ≤ 1.5 μm / mm is an empirical range obtained from extensive prior experiments.

[0045] Preferably, in this embodiment, in each cell set, 0.9 μm / mm ≤ |dh / dx| ≤ 1.2 μm / mm, to further improve the quality of the functional film layer formed on the substrate.

[0046] Optionally, in each cell set, |dw / dx| ≤ 2μm / mm. Here, dw is the difference in circumscribed circle diameters (μm) of the cross-sections of two individual cells 221 spaced axially along the coating roller 2 when the coating roller 2 is unfolded into a planar structure, corresponding to their cross-sections perpendicular to their depth direction; dx is the spacing (mm) between two individual cells 221 spaced axially along the coating roller 2. For example, in some embodiments, dw / dx is set to 1μm / mm.

[0047] Along the axial direction of the coating roller 2, from the middle to both ends, both excessively small and excessively large circumscribed circle diameter gradients can easily lead to turbulence or eddies in the coating liquid, which is not conducive to the uniform spreading of the coating liquid on the roller surface. Therefore, setting |dw / dx|≤2μm / mm makes the flow of the coating liquid closer to a laminar flow state, thereby further improving the quality of the functional film layer formed on the substrate.

[0048] Wherein, |dw / dx|≤2μm / mm is an empirical range obtained from a large number of previous experiments.

[0049] Preferably, in this embodiment, in each cell set, 1μm / mm ≤ |dw / dx| ≤ 1.2μm / mm. This further improves the quality of the functional film layer formed on the substrate.

[0050] Optionally, for each individual cell 221, 0.6 ≤ h / W ≤ 0.9. Where h is the depth of the individual cell 221, in μm; W is the circumscribed circle diameter of the cross-section of the individual cell 221 perpendicular to its own depth direction when the coating roller 2 is unfolded into a planar structure, in μm.

[0051] To balance the transfer efficiency of the coating liquid with the uniformity of the coating, avoid the coating liquid from stagnating in the monomer cells 221, and consider both the flowability of the high-viscosity coating liquid and the uniformity of its distribution, a depth that is too small for the monomer cells 221 can lead to the accumulation of coating liquid on the outer periphery of the coating layer 22, resulting in uneven coating thickness. Conversely, a depth that is too large can cause liquid stagnation, leading to missed coating or a decrease in the amount of coating liquid transferred. Therefore, a depth of 0.6 ≤ h / W ≤ 0.9 is set to reduce the impact of excessively large or small depths of the monomer cells 221 on the coating quality, further improving the quality of the functional film layer formed on the substrate. The range of 0.6 ≤ h / W ≤ 0.9 is an empirical range obtained from extensive prior experiments.

[0052] Optionally, 0.05L2≤L1≤0.95L2. Wherein, L1 is the distance between the two ends of the two mesh sets along the axial direction of the coating roller 2, in mm; and L2 is the axial length of the coating roller 2.

[0053] It is understandable that, such as Figure 1 and Figure 2As shown, along the axial direction of the coating roller 2, non-working areas 222 are formed outside both ends of the two cell sets. This can effectively reduce the risk of material overflow at both ends of the coating roller 2, avoid affecting the operation of the drive mechanism that drives the coating micro-concave roller, save coating liquid consumption, and further improve the quality of the functional film layer formed on the substrate.

[0054] In this embodiment, L2 is set to ≥ 200 mm.

[0055] Based on extensive preliminary testing, by using this coating micro-grooved roller to coat the substrate with a functional film, the probability of edge curling at both ends of the coated substrate is less than or equal to 6%, and the probability of thickness deviation of the functional film on the coated substrate is less than or equal to 5.3%, compared with existing technologies. This effectively alleviates the problem of edge curling at both ends of the coated substrate and significantly improves the quality of the functional film formed on the substrate.

[0056] This invention also provides a coating apparatus, including the aforementioned coating micro-grooved roller. By employing the aforementioned coating micro-grooved roller, the problem of edge curling at both ends of the coated substrate is effectively alleviated, thereby effectively improving the quality of the functional film layer formed on the substrate.

[0057] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A coating micro-grooved roller, characterized in that, include: Main spindle (1); The coating roller (2) includes a roller body (21) and a coating layer (22) coated on the outer peripheral wall of the roller body (21). The roller body (21) is fixedly sleeved on the outer periphery of the main shaft (1). The outer peripheral wall of the coating layer (22) is recessed with a plurality of cell groups. The plurality of cell groups are distributed at intervals along the axial direction of the coating roller (2). Each cell group includes a plurality of single cells (221) with the same volume distributed at intervals along the circumference of the coating roller (2). The plurality of cell groups are divided into two cell sets from the middle position of the axial direction of the coating roller (2). From the middle to the two ends along the axial direction of the coating roller (2), the volume of the single cells (221) in each cell set gradually decreases.

2. The coating micro-grooved roller according to claim 1, characterized in that, In each set of holes, 1.5 ≤ Vmax / Vmin ≤ 3; Where Vmax is the volume of the largest single hole (221) in the hole set, in μm. 3 Vmin is the volume of the smallest single cell (221) in the cell set, in μm. 3 .

3. The coating micro-grooved roller according to claim 2, characterized in that, In each of the aforementioned cell sets, 75μm 3 ≤Vmax≤900μm 3 50μm 3 ≤Vmin≤300μm 3 .

4. The coating micro-grooved roller according to any one of claims 1-3, characterized in that, In each of the aforementioned sets of holes, |dh / dx| ≤ 1.5 μm / mm; Wherein, dh is the depth difference between two individual cells (221) spaced along the axial direction of the coating roller (2) in the cell set, in μm; dx is the distance between two individual cells (221) spaced along the axial direction of the coating roller (2) in the cell set, in mm.

5. The coating micro-grooved roller according to claim 4, characterized in that, In each of the aforementioned sets of holes, 0.9 μm / mm ≤ |dh / dx| ≤ 1.2 μm / mm.

6. The coating micro-grooved roller according to any one of claims 1-3, characterized in that, When the coating roller (2) is unfolded into a planar structure, the cross-sectional shape of the individual cell (221) perpendicular to its own depth direction is triangular, rhomboid, or rectangular.

7. The coating micro-grooved roller according to claim 6, characterized in that, In each set of holes, |dw / dx|≤2μm / mm; Wherein, dw is the difference in diameter of the circumscribed circle of the cross section of two individual cells (221) spaced apart along the axial direction of the coating roller (2) in the cell set when the coating roller (2) is unfolded into a planar structure, in μm; dx is the distance between two individual cells (221) spaced apart along the axial direction of the coating roller (2) in the cell set, in mm.

8. The coating micro-grooved roller according to claim 7, characterized in that, In each of the aforementioned sets of holes, 1 μm / mm ≤ |dw / dx| ≤ 1.2 μm / mm.

9. The coating micro-grooved roller according to claim 6, characterized in that, For each of the said individual holes (221), 0.6 ≤ h / W ≤ 0.9; Where h is the depth of the individual cell (221), μm; W is the diameter of the circumscribed circle of the individual cell (221) perpendicular to its own depth direction when the coating roller (2) is unfolded into a planar structure, μm.

10. A coating apparatus, characterized in that, Including the coating micro-grooved roller as described in any one of claims 1-9.

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