Coating roller

Abstract

The utility model discloses a coating roller, an annular groove is arranged around the outer surface of the coating roller, the groove spirally extends along the circumferential direction of the coating roller, and the depth of the groove in the middle of the length direction of the coating roller is larger than that of the grooves on the two sides of the length direction of the coating roller. When the coating roller is operated and a coating is coated on a base material, the coating is guided by the spiral groove, the depth of the groove is shallow at two ends and deep in the middle, and the distance between the groove and the groove is large in the middle and small at two ends, so that the movement amount of the coating on the edge part is small, and the coating is uniformly coated on the whole width direction of the base material more smoothly. In addition, the coating is not easy to overflow to the side surface of the base material, and is not easy to contaminate the periphery of the base material or coating equipment. Besides, as the whole coating roller is provided with the spiral grooves, the movement amount of the coating at the edge part is more stable, and the flowing of the coating is not easily blocked, so that the spiral grooves are not easily blocked, and are easier to clean and maintain.

Description

Technical Field

[0001] The utility model relates to a coating roller for coating adhesives and other coatings on substrates such as plastic films. Background Art

[0002] CN 113621161 B discloses an online-coated easy-to-print polyester film, which comprises at least a polyester base film, at least one surface of which is provided with an online coating layer, and a printing layer is formed on the outer side of the online coating layer.

[0003] In the prior art, plastic films of this structure usually require coatings such as adhesives to be squeezed onto the surface of the film using a coating roller to improve the surface properties of the film or facilitate the bonding of the film.

[0004] CN 102847654 B discloses an automatic adjustment device for the gap between a metering roller and a coating roller. By adjusting the gap between the metering roller and the coating roller, the thickness of the coating scraped from the surface of the coating roller is controlled, thereby making the coating thickness uniform and improving the coating quality.

[0005] However, during the coating process, the coating in the middle of the coating roller is subjected to a relatively large extrusion force. Since the two ends of the coating roller are free, the coating in the middle will gradually be squeezed toward the two ends, and the coating layer will appear thin in the middle and thick on both sides.

[0006] CN 102553797 B discloses a process for coating insulating varnish on the surface of an oriented silicon steel strip, wherein conical grooves are provided around the surface of a coating roller.

[0007] The grooves in this prior art can block the lateral flow of paint, alleviating the problem of thickening the coating at the ends of the coating roller. However, the grooves on the coating roller surface do not eliminate the problem of the coating in the middle being subjected to greater pressure than at the ends. The coating thickness scraped onto the coating roller surface is the same, and the areas subjected to greater pressure will inevitably become thinner. Consequently, the problem of thickening at the ends will persist over long periods of operation. Furthermore, the obstruction of the coating causes poor flow in the grooves, making them prone to clogging and difficult to clean and maintain. Summary of the Invention

[0008] The technical problem to be solved by the present application is to provide a coating roller to reduce or avoid the above-mentioned problems.

[0009] In order to solve the above technical problems, the utility model proposes a coating roller, which is provided with an annular groove around the outer surface of the coating roller, wherein: the groove extends spirally along the circumference of the coating roller, and the groove depth in the middle of the length direction of the coating roller is greater than the groove depth on both sides.

[0010] Preferably, the groove pitch of the coating roller in the middle portion in the longitudinal direction is greater than the groove pitch of the coating roller on both sides.

[0011] Preferably, the depth of the groove linearly increases from the end of the coating roller toward the middle of the coating roller.

[0012] Preferably, a transmission gear is provided on one side of the central axis of the coating roller.

[0013] Preferably, the groove depth is 300 μm to 600 μm.

[0014] Preferably, the groove pitch is 600 μm to 1100 μm.

[0015] During operation, the coating roller of the present application guides the coating material as it is applied to the substrate, guided by the spiral grooves. The grooves are shallow at the ends and deep in the middle, while the groove spacing is larger in the middle and smaller at the ends. Consequently, less coating material moves at the edges, which allows for smoother, even coating across the entire width of the substrate. Furthermore, the coating material is less likely to overflow onto the sides of the substrate, nor is it likely to contaminate the surrounding area of ​​the substrate or the coating equipment. Furthermore, because the entire coating roller has spiral grooves, coating material moves more smoothly at the edges, making the flow of the coating less likely to be obstructed. Consequently, the spiral grooves are less likely to clog, making cleaning and maintenance easier.

[0016] Since the coating roller of the present application adopts grooves that are shallow at both ends and deep in the middle, more paint is scraped onto the surface of the coating roller in the middle and less at both ends during coating. Therefore, even if the extrusion force on the paint in the middle is greater than that on the two ends, after the paint is squeezed to both sides, it is still possible to ensure that enough paint is retained in the middle, thereby avoiding the phenomenon that the coating layer is thin in the middle and thick on both sides. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The following drawings are only intended to illustrate and explain the present application, and are not intended to limit the scope of the present invention.

[0018] Figure 1 Shown is a schematic diagram of the three-dimensional structure of a coating roller according to a specific embodiment of the present utility model.

[0019] Figure 2 Shown is a schematic cross-sectional view of a coating roller according to another specific embodiment of the present invention.

[0020] Figure 3 Shown is a partially enlarged schematic cross-sectional view of a coating roller according to a specific embodiment.

[0021] Figure 4 Shown is a partially enlarged schematic cross-sectional view of a coating roller according to another specific embodiment. DETAILED DESCRIPTION

[0022] In order to have a clearer understanding of the technical features, purpose and effects of the present invention, the specific implementation of the present invention is now described with reference to the accompanying drawings, wherein the same components are marked with the same reference numerals.

[0023] Figure 1-4 The structure of the coating roller of the present invention is shown. The illustrated coating roller is suitable for coating coatings on substrates, including but not limited to various plastic films, glass substrates, metal or non-metallic flat plates, printed circuit boards, etc. The coatings include but not limited to adhesives, resins, glues, inks, etc.

[0024] As shown in the figure, the coating roller of the present application has a central shaft 2, with a transmission gear 5 disposed on one side of the central shaft 2. An external drive gear can mesh with the transmission gear 5, thereby driving the coating roller to rotate. An annular groove 4 is provided around the outer surface of the coating roller. In the illustrated embodiment, the groove 4 extends in a spiral shape along the circumference of the coating roller, and the groove depth in the middle of the coating roller along the longitudinal direction is greater than the groove depth on the sides.

[0025] In this application, since the entire coating roller has a spiral groove, the paint can flow along the groove 4 during the extrusion coating process, so that the paint movement at the edge can be more stable and the flow of the paint is less likely to be obstructed. Therefore, the spiral groove is less prone to clogging and is easier to clean and maintain.

[0026] in addition, Figure 3 and Figure 4 The illustrated embodiment shows Figure 2 The enlarged partial cross-sectional view of the circled portion of the coating roller in FIG. 1 shows that the spiral grooves 4 have a shallower groove depth H1 at both ends of the coating roller in the longitudinal direction and a deeper groove depth H2 in the middle. The groove depth of the grooves 4 can be arbitrarily selected based on the application and the viscosity of the coating, but is typically selected to be approximately 300 μm to 600 μm.

[0027] In a specific embodiment, as shown in the figure, the depth of the groove 4 can be uniformly shallowed from both ends to the middle along the length direction of the coating roller. For example, the depth of the groove becomes deeper in a straight line from the end of the coating roller to the middle of the coating roller, as shown in FIG. Figure 3 shown.

[0028] Furthermore, if Figure 4 As shown, the groove pitch in the middle of the coating roller in the longitudinal direction is greater than the groove pitch at both sides. For example, the groove 4 has a smaller groove pitch D1 at both ends of the coating roller in the longitudinal direction, and a larger groove pitch D2 in the middle. Figure 3The same embodiment shown, the groove 4 has a shallow groove depth H1 at both ends of the coating roller in the longitudinal direction, and a deeper groove depth H2 in the middle. The groove pitch of the groove 4 can be arbitrarily selected according to the application and the viscosity of the coating, but is generally selected to be about 600μm to 1100μm. Figure 3 In the embodiment shown, all grooves 4 have the same groove pitch D.

[0029] The central shaft 2 can be made of metal materials such as iron, or can be made of hard resin materials such as chlorinated polyvinyl chloride, and its shape can be a square rod, a square tube, a round rod, a round tube or other shapes.

[0030] The material of the coating roller is not particularly limited, but rubber materials are ideal, for example, polyurethane rubber, ethylene-propylene-diene copolymer, butyl rubber, ethylene-propylene rubber, nitrile rubber and other synthetic rubbers can be used.

[0031] During operation, the coating roller of the present application guides the coating material as it is applied to the substrate, guided by the spiral grooves. The grooves are shallower at the ends and deeper in the middle, while the groove spacing is larger in the middle and smaller at the ends. This reduces the amount of coating material moving around the edges, resulting in smoother and more even coating across the entire width of the substrate. Furthermore, the coating is less likely to overflow onto the sides of the substrate, nor to stain the surrounding area of ​​the substrate or the coating equipment.

[0032] Since the coating roller of the present application adopts grooves that are shallow at both ends and deep in the middle, more paint is scraped onto the surface of the coating roller in the middle and less at both ends during coating. Therefore, even if the extrusion force on the paint in the middle is greater than that on the two ends, after the paint is squeezed to both sides, it is still possible to ensure that enough paint is retained in the middle, thereby avoiding the phenomenon that the coating layer is thin in the middle and thick on both sides.

[0033] Those skilled in the art should understand that although the present invention is described in terms of multiple embodiments, not each embodiment contains only one independent technical solution. This description is provided for clarity only. Those skilled in the art should understand the description as a whole and consider the technical solutions involved in each embodiment as being combinable into different embodiments to understand the scope of protection of the present invention.

[0034] The above description is only an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes, modifications and combinations made by any person skilled in the art without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A coating roller having an annular groove arranged around the outer surface of the coating roller, characterized in that: The grooves extend in a spiral shape along the circumference of the coating roller, and the depth of the grooves in the middle portion in the longitudinal direction of the coating roller is greater than the depth of the grooves at both sides.

2. The coating roller according to claim 1, characterized in that: The pitch of the grooves in the middle portion of the coating roller in the longitudinal direction is greater than the pitch of the grooves on both sides.

3. The coating roller according to claim 1, wherein: The depth of the groove linearly increases from the end portion of the coating roller toward the middle portion of the coating roller.

4. The coating roller according to claim 1, wherein: A transmission gear is provided on one side of the central axis of the coating roller.

5. The coating roller according to claim 1, wherein: The groove depth is 300 μm to 600 μm.

6. The coating roller according to claim 1, characterized in that: The groove pitch is 600 μm to 1100 μm.

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