Coating gravure roller and coating equipment

Abstract

The coating gravure roller comprises a roller body, a plurality of protrusions are arranged on the roller body at intervals in the axial direction, the cross section of each protrusion is of an isosceles trapezoid structure, and the edges of the adjacent protrusions jointly form a groove with the cross section of a V-shaped structure. According to the coating gravure roller and the coating equipment, the groove design of the V-shaped structure is large in liquid carrying amount, and the coating uniformity can be effectively improved; by increasing the included angle theta, the liquid carrying area of the gravure roller can be increased, and the coating liquid of the gravure roller can be more uniformly covered when the scraper is in contact with the gravure roller, so that the coating effect is improved; the large included angle theta facilitates cleaning of the gravure roller, and it is guaranteed that foreign matter is not prone to remaining on the surface of the gravure roller.

Description

Technical Field

[0001] This utility model relates to the field of diffusion film coating technology, and in particular to a coating gravure roller and coating equipment. Background Technology

[0002] In the diffusion film coating process, a gravure roller carries the diffusion coating liquid to coat the diffusion film. The amount of liquid carried by the gravure roller directly affects the uniformity of the diffusion film coating, and thus affects production performance. For example, if the amount of liquid carried by the gravure roller in the coating equipment is insufficient, it will cause uneven coating of the diffusion film. Furthermore, the diffusion coating liquid contains particles, and the distribution of these particles will also be uneven, resulting in uncoated areas on the diffusion film.

[0003] Based on the above problems, how to improve the liquid carrying capacity of existing gravure rollers to achieve uniform coating of the diffusion film is a technical challenge that urgently needs to be solved in this industry. Therefore, this application proposes a novel coating gravure roller. Utility Model Content

[0004] The purpose of this invention is to provide a coating gravure roller and coating equipment. By designing the structure and angle of the existing gravure roller, it is possible to increase its liquid carrying capacity, thereby improving the uniformity of diffusion film coating.

[0005] The purpose of this utility model is achieved through the following technical solution:

[0006] A coating gravure roller includes a roller body, wherein a plurality of protrusions are spaced apart along the axial direction, the cross-section of each protrusion is an isosceles trapezoidal structure, and the sides of adjacent protrusions together form a groove with a V-shaped cross-section.

[0007] In some embodiments, the top width b of the protrusion is 20μm-30μm, and the pitch between adjacent protrusions is 30μm-40μm.

[0008] In some embodiments, the top width b of the protrusion is 25 μm, and the pitch p of the adjacent protrusion is 36 μm.

[0009] In some embodiments, the depth t of the groove is 25μm-30μm.

[0010] In some embodiments, the depth t of the groove is 27 μm.

[0011] In some embodiments, the top of the protrusion is a plane.

[0012] In some embodiments, the groove is located on the surface of the roller and forms an angle θ with the X-axis, the angle θ being 60°-70°.

[0013] In some embodiments, the included angle θ is 65°.

[0014] In some embodiments, the roller body is integrally formed with the protrusion and the groove.

[0015] A coating apparatus comprising the coating gravure roller described above.

[0016] Compared with the prior art, the beneficial effects of this utility model include at least the following:

[0017] 1. The V-shaped groove design allows for a larger liquid carrying capacity and effectively improves the uniformity of coating.

[0018] 2. By increasing the included angle θ, the area of ​​the coating liquid on the gravure roller can be increased, and the doctor blade can more evenly cover the coating liquid on the gravure roller when it contacts the gravure roller, thereby improving the coating effect.

[0019] 3. A large included angle θ is more conducive to cleaning the gravure roller, ensuring that foreign matter is not easily left on its surface. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the surface structure of the coating gravure roller of this utility model.

[0021] Figure 2 This is a partial schematic diagram of the coating gravure roller of this utility model.

[0022] In the diagram: 1. Roller body; 2. Protrusion; 3. Groove. Detailed Implementation

[0023] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided to make the present invention more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore repeated descriptions of them will be omitted.

[0024] The terms used to describe position and direction in this utility model are illustrated with the accompanying drawings, but may be changed as needed, and all such changes are included within the scope of protection of this utility model.

[0025] See Figure 1 As shown, this utility model discloses a coating gravure roller, including a roller body 1, a protrusion 2 and a groove 3.

[0026] The number of protrusions 2 is several, and they are spaced apart along the axial direction of the roller body 1. The cross-section of the protrusion 2 is an isosceles trapezoidal structure. The isosceles trapezoidal structure of the protrusion 2 facilitates the forming of the groove 3 required, and at the same time makes the top surface of the protrusion 2 flat, thereby avoiding wear of the doctor blade that comes into contact with it (if the doctor blade is worn during the coating process and is not replaced in time, it will cause uneven coating, which will affect the coating quality and the final product will affect the display screen).

[0027] The groove 3 is located between adjacent protrusions 2. The cross-section of the groove 3 is V-shaped and is formed by the cooperation of the edges of adjacent protrusions 2. Compared with the flat-bottomed groove of the existing gravure roller, the groove 3 of the V-shaped structure in this application is relatively deeper, thus carrying more liquid. The coating liquid contained in the groove can be more evenly coated onto the film material, thereby improving the coating effect of the diffusion film.

[0028] In some embodiments, the roller body 1 may be integrally formed with the protrusion 2 and the groove 3.

[0029] In some embodiments, the top width b of the protrusion 2 is 20μm-30μm, the pitch of adjacent protrusions 2 is 30μm-40μm, and the depth t of the groove 3 is 25μm-30μm. Within this size range, the shape and structure of the gravure roller are optimal, which can effectively reduce product appearance defects and improve product quality while ensuring sufficient liquid volume.

[0030] Tests showed that the product had the best appearance quality and the highest yield when the top width b of protrusion 2 was 25μm, the pitch p of adjacent protrusion 2 was 36μm, and the depth t of groove 3 was 27μm. The 27μm depth of groove 3 could accommodate sufficient coating liquid, while the wider pitch of 36μm could increase the amount of coating liquid on the gravure roller, allowing the coating liquid to be better and more evenly covered on the gravure roller under the action of the doctor blade, which facilitates the transfer of coating liquid to PET.

[0031] See Figure 2 As shown, in this coating gravure roller, the groove 3 is located on the surface of the roller body 1 and forms an angle θ with the X-axis, with the angle θ being 60°-70°. Compared to the smaller angle of existing gravure rollers, the angle θ of this application is larger. Under the same cross-section, the larger the angle, the more grooves 3 there are, and the greater the amount of liquid carried. After the doctor blade scrapes off the excess coating liquid on the surface of the gravure roller, the coating of the film material on the gravure roller will be more uniform (if the amount of liquid carried is insufficient, it will cause uneven coating of the film material, thus affecting the product quality).

[0032] In addition, when the included angle θ is larger, the gravure roller is easier to clean, and foreign matter remaining on the gravure roller is easier to clean and remove. Foreign matter is less likely to adhere to the gravure roller and affect subsequent coating operations.

[0033] In a preferred embodiment, the included angle θ is 65°. The coating liquid content and surface cleanliness are compared with those of an existing gravure roller with an included angle of 45°. The results are shown in the table below:

[0034]

[0035] The comparison shows that by increasing the angle θ formed by the groove 3 and the X-axis, the coating gravure roller can increase the area of ​​liquid it carries. When the doctor blade contacts the gravure roller, it can more evenly cover the coating liquid on the gravure roller, thereby improving the coating effect. In addition, the increased angle also facilitates the cleaning of the gravure roller, making it less likely for foreign objects to remain on its surface and avoiding affecting subsequent coating operations.

[0036] In addition, this utility model also discloses a coating device, including the above-mentioned coating gravure roller, thereby improving the liquid carrying capacity, enhancing the coating effect and product quality, and facilitating the cleaning of foreign objects.

[0037] Although embodiments of the present utility have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present utility. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present utility without departing from the principles and spirit of the present utility, and all such changes should fall within the protection scope of the claims of the present utility.

Claims

1. A coating gravure roller, characterized in that, It includes a roller body (1), which is provided with a plurality of protrusions (2) spaced apart along the axial direction. The cross-section of the protrusions (2) is an isosceles trapezoidal structure, and the sides of adjacent protrusions (2) together form a groove (3) with a V-shaped cross-section. The top width b of the protrusion (2) is 20μm-30μm, and the pitch p of the adjacent protrusion (2) is 30μm-40μm; The depth t of the groove (3) is 25μm-30μm; The groove (3) is located on the surface of the roller (1) and forms an angle θ with the X-axis, the angle θ being 60°-70°.

2. The coating gravure roller according to claim 1, characterized in that, The top width b of the protrusion (2) is 25 μm, and the pitch p of the adjacent protrusion (2) is 36 μm.

3. The coating gravure roller according to claim 1, characterized in that, The depth t of the groove (3) is 27 μm.

4. The coating gravure roller according to claim 1, characterized in that, The top of the protrusion (2) is flat.

5. The coating gravure roller according to claim 1, characterized in that, The included angle θ is 65°.

6. The coating gravure roller according to claim 1, characterized in that, The roller body (1) is integrally formed with the protrusion (2) and the groove (3).

7. A coating apparatus, characterized in that, Including the coating gravure roller as described in any one of claims 1-6.

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