A film coating doctor blade device

Abstract

The utility model discloses a kind of film coating doctor blade coating devices, comprising: doctor bar, with base connection, with the film entry side and the film exit side;Further comprising: film pressing element, located above doctor bar or deviated to the film exit side, is arranged in pairs and is separately arranged at the both ends of doctor bar, with the elastic film pressing head towards doctor bar;Edge trimming fine adjustment element, the spacing between film pressing element and doctor bar is adjusted, and the spacing between elastic film pressing head and doctor bar end surface is adjusted.The above-mentioned film coating doctor blade coating device structure is reasonable, by the setting of film pressing element, the side edge of coating film is clamped between film pressing element and doctor bar, film is close to doctor bar, and then effectively prevent air from spreading from the side edge of film to core, prevent film surface from appearing bubble;Combined with the setting of edge trimming fine adjustment element, it is suitable for different width and layer thickness film coating production.

Description

Technical Field

[0001] This utility model relates to the field of coating equipment technology, and in particular to a thin film coating scraping device. Background Technology

[0002] In the production of polyester biaxially stretched films, doctor blade coating is one of the processes for coating the film surface. Its basic principle is to use the precise gap formed between the precision doctor blade and the coating film to control the amount of coating liquid transferred, thereby forming a uniform coating layer.

[0003] During film coating, the squeegee is typically positioned below the film. However, air bubbles often appear on the film surface during squeegee coating. Currently, commonly used coating machines employ squeegees that are driven by a motor, making them active rollers. This results in continuous mechanical friction at both ends of the squeegee, causing annular grooves or scratches on their surfaces. Consequently, wear on the squeegee negatively impacts the coating quality of the film, shortens its lifespan, and increases production costs.

[0004] Therefore, it is necessary to improve the existing thin film coating and scraping devices. Utility Model Content

[0005] The purpose of this utility model is to overcome the defects in the existing technology and provide a thin film coating scraping device. By setting the film pressing component, the side of the coating film is clamped between the film pressing component and the scraper, and the film is pressed tightly against the scraper, thereby effectively preventing air from diffusing from the side of the film to the core and preventing bubbles from appearing on the film surface. Combined with the setting of the edge pressing fine adjustment component, it is suitable for the coating production of films with different widths and layer thicknesses.

[0006] To achieve the above-mentioned technical effects, the technical solution of this utility model is: a thin film coating and scraping device, comprising: The scraper bar, connected to the base, has an inlet side and an outlet side; Also includes: A film pressing component is located above or biased towards the film exit side of the scraper bar, and is arranged in pairs and disposed at both ends of the scraper bar, having an elastic film pressing head facing the scraper bar; The edge-pressing fine-tuning component adjusts the distance between the pressing component and the scraper, and also adjusts the distance between the elastic pressing head and the end face of the scraper.

[0007] A preferred technical solution is that the elastic pressure head is a roller, and the axial direction of the roller is consistent with the axial direction of the scraper.

[0008] A preferred technical solution is that the scraper is a driven roller.

[0009] A preferred technical solution is that the base is provided with a liquid receiving base, a bearing seat, and a lifting and fine-tuning component. The bearing seat is axially limited to both ends of the scraper through an assembly groove. The distance between the bottom of the assembly groove and the top surface of the liquid receiving base is adjusted by the lifting and fine-tuning component.

[0010] A preferred technical solution is that the edge-pressing fine-tuning component includes a first connecting rod, a second connecting rod, and a third connecting rod. The first connecting rod is connected to the liquid receiving base. The extension direction of the second connecting rod is consistent with the extension direction of the scraper. One end passes through the end of the first connecting rod, and the other end is sleeved on the outer surface of the third connecting rod. The second connecting rod is connected to the first connecting rod and the third connecting rod by a locking bolt. The extension end of the third connecting rod faces the scraper and is connected to the pressing component.

[0011] A preferred technical solution is that the lifting and fine-tuning component includes a guide groove provided in the bearing seat, a limiting hole provided in the liquid receiving base, a screw and a nut. The extension direction of the guide groove is consistent with the height extension direction of the bearing seat. The free end of the screw passes through the guide groove and the limiting hole and is threadedly connected to the nut.

[0012] A preferred technical solution is that the base is further provided with a lifting component, which adjusts the distance between the liquid receiving base and the base.

[0013] A preferred technical solution is that the lifting assembly includes a transmission rod, a lead screw, and a driving component. The driving component is connected to the end of the transmission rod. The transmission rod is provided with a helical gear that meshes with the lead screw. The lead screws are arranged in pairs, and the pairs of lead screws are threadedly connected to the liquid receiving base.

[0014] A preferred technical solution is that the liquid receiving base is provided with a receiving groove, the receiving groove is located directly below the scraper, the extending direction of the receiving groove is consistent with the extending direction of the scraper, and the opening of the receiving groove is provided with an elastic guard.

[0015] A preferred technical solution is that the bearing housing is a detachable bearing housing.

[0016] The advantages and beneficial effects of this invention are as follows: By placing the film-pressing components at both ends of the doctor blade, the side edges of the coating film are clamped between the film-pressing components and the doctor blade, ensuring the film adheres tightly to the doctor blade and effectively preventing air from diffusing from the film sides to the core. Combined with the edge-adjusting components, this design is suitable for coating films of different widths and thicknesses. The flexible film-pressing head prevents scratches on the film surface. Attached Figure Description

[0017] Figure 1 This is a perspective view of the film coating and scraping device of this utility model; Figure 2 This is a perspective view of the film coating and scraping device of this utility model from another angle; Figure 3 This is a front view of the film coating and scraping device of this utility model.

[0018] In the diagram: 1. Base; 2. Scraper; 3. Pressing film component; 4. Edge pressing fine-tuning component; 5. Lifting assembly; 10. Liquid receiving base; 11. Bearing seat; 12. Lifting fine-tuning component; 30. Elastic pressing film head; 40. Locking bolt; 41. First connecting rod; 42. Second connecting rod; 43. Third connecting rod; 51. Transmission rod; 52. Lead screw; 53. Drive component; 100. Receiving groove; 101. Elastic edge protector; 110. Recessed part; 121. Guide groove; 122. Limiting hole; 123. Screw; 124. Nut. Detailed Implementation

[0019] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0020] The terms "above," "below," "in," and "out" refer to the normal operating state of the thin film coating and scraping device. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component 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.

[0021] Furthermore, the terms "first," "second," etc., 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. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0022] like Figures 1-3 As shown, the film coating device of this utility model includes a base 1, a scraper 2, a film pressing component 3, and an edge-adjusting component 4. The scraper 2 is connected to the base 1 and has an inlet side and an outlet side. The film pressing component 3 is located above the scraper 2 or biased towards the outlet side, and is arranged in pairs at both ends of the scraper 2, with an elastic film pressing head 30 facing the scraper 2. The edge-adjusting component 4 adjusts the distance between the film pressing component 3 and the scraper 2, and adjusts the distance between the elastic film pressing head 30 and the end face of the scraper 2.

[0023] The base 1 is a coating liquid receiving base with a retaining edge. The coating liquid spraying assembly is provided on the film entry side of the scraper 2, which is not shown in the figure. The film delivery channel is located above the scraper and sandwiched between the film pressing component 3 and the scraper 2. Figure 1 In the diagram, the arrow points in the direction of the film's movement.

[0024] By placing the film pressing component 3 at both ends of the scraper 2, the side edge of the coating film is clamped between the film pressing component 3 and the scraper 2, so that the film adheres tightly to the scraper 2, thereby effectively preventing air from diffusing from the side edge of the film to the core; combined with the setting of the edge pressing fine adjustment component 4, it is suitable for film coating production with different widths and layer thicknesses.

[0025] The elastic pressure head 30 is designed to prevent scratching the film surface. Furthermore, the elastic pressure head 30 is made of rubber to improve the clamping force between the pressure member 3 and the scraper 2.

[0026] In order to reduce the friction between the elastic pressure head 30 and the film and prevent scratching the film surface, the elastic pressure head 30 is a roller, and the axis of the roller is consistent with the axis of the scraper 2.

[0027] When the film is fed, it is subjected to traction force on the exit side. The scraper 2 is a driven roller that is driven to rotate along its axis by the film, which effectively solves the problem of wear caused by mechanical friction on the scraper 2.

[0028] The film-feeding channel is not fixed. In order to ensure the precise gap between the scraper 2 and the coating layer of the film, and thus control the amount of coating liquid transferred to form a uniform coating layer, the base 1 is provided with a liquid receiving base 10, a bearing seat 11 and a lifting fine adjustment component 12. The bearing seat 11 is axially limited to both ends of the scraper 2 through the assembly groove. The bearing seat 11 adjusts the distance between the bottom of the assembly groove and the top surface of the liquid receiving base 10 through the lifting fine adjustment component 12.

[0029] To simplify the structure of the edge-pressing fine-tuning component 4 and facilitate operation, in some preferred embodiments, the edge-pressing fine-tuning component 4 includes a first connecting rod 41, a second connecting rod 42, and a third connecting rod 43. The first connecting rod 41 is connected to the liquid receiving base 10. The extension direction of the second connecting rod 42 is consistent with the extension direction of the scraper 2. One end passes through the end of the first connecting rod 41, and the other end is sleeved on the outer surface of the third connecting rod 43. The second connecting rod 42 is connected to the first connecting rod 41 and the third connecting rod 42 by a locking bolt 40. The extension end of the third connecting rod 42 faces the scraper 2 and is connected to the film pressing component 3. The second connecting rod 42 is configured to adjust the distance between the elastic film pressing head 30 and the end face of the scraper 2, which is set according to the width of the film. The third connecting rod 43 is configured to adjust the distance between the film pressing component 3 and the scraper 2, which is set according to the thickness of the film and the thickness of the coating layer.

[0030] like Figure 2As shown, in order to fine-tune the gap between the scraper 2 and the coating layer of the film to form a precise gap, while ensuring the spacing between the liquid receiving base 10 and the scraper 2 to prevent the coating liquid from splashing everywhere, in some preferred embodiments, the lifting fine-tuning component 12 includes a guide groove 121 provided in the bearing seat 11, a limiting hole 122 provided in the liquid receiving base 10, a screw 123 and a nut 124. The extending direction of the guide groove 121 is consistent with the height extending direction of the bearing seat 11. The free end of the screw 123 passes through the guide groove 121 and the limiting hole 122 and is threadedly connected to the nut 122. Furthermore, the bearing seat 11 is a detachable bearing seat to facilitate the installation, replacement or cleaning of the scraper 2. In order to optimize the arrangement of components in the film coating scraper device and compact the arrangement to reduce space, a recess 110 is provided on the side of the liquid receiving base 10, and the thickness of the bearing seat 11 is less than or equal to the depth of the recess 110.

[0031] The base 1 is also equipped with a lifting component 5, which adjusts the distance between the liquid receiving base 10 and the base 1. The lifting height of the liquid receiving base 10 can be adjusted to a large extent, which not only adjusts the gap between the scraper 2 and the coating layer, but also reduces the obstruction of the coating liquid return liquid, thus facilitating the flow of the remaining coating liquid back into the coating liquid spraying component.

[0032] like Figure 3 As shown, the lifting assembly 5 further includes a transmission rod 51, a lead screw 52, ​​and a driving member 53. The driving member 52 is connected to the end of the transmission rod 51. The transmission rod 51 is provided with a helical gear that meshes with the lead screw 52. The lead screws 52 are arranged in pairs, and the paired lead screws 52 are threadedly connected to the liquid receiving base 10. Furthermore, the liquid receiving base 10 is threadedly connected to the lead screw 52 via a slider. In the figure, the threads on the surface of the lead screw are not shown to simplify the structure.

[0033] To collect the coating liquid and prevent it from splashing, the receiving base 10 is equipped with a receiving groove 100, which is located directly below the scraper 2. The extending direction of the receiving groove 100 is the same as that of the scraper 2, and the opening of the receiving groove 100 is provided with an elastic guard 101. The elastic guard 101 can be made of rubber, which effectively prevents the scraper 2 from colliding with the receiving groove 100 and causing scratches during the lifting and lowering process.

[0034] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A thin film coating device, comprising: The scraper bar, connected to the base, has an inlet side and an outlet side; Its characteristic is that it further includes: A film pressing component is located above or biased towards the film exit side of the scraper bar, and is arranged in pairs and disposed at both ends of the scraper bar, having an elastic film pressing head facing the scraper bar; The edge-pressing fine-tuning component adjusts the distance between the pressing component and the scraper, and also adjusts the distance between the elastic pressing head and the end face of the scraper.

2. The thin film coating and scraping device according to claim 1, characterized in that, The elastic pressure head is a roller, and the axial direction of the roller is consistent with the axial direction of the scraper.

3. The thin film coating and scraping device according to claim 1, characterized in that, The scraper is a driven roller.

4. The thin film coating and scraping device according to claim 3, characterized in that, The base is provided with a liquid receiving base, a bearing seat and a lifting and fine adjustment component. The bearing seat is axially limited to both ends of the scraper through an assembly groove. The distance between the bottom of the assembly groove and the top surface of the liquid receiving base is adjusted by the lifting and fine adjustment component.

5. The thin film coating and scraping device according to claim 4, characterized in that, The edge-pressing fine-tuning component includes a first connecting rod, a second connecting rod, and a third connecting rod. The first connecting rod is connected to the liquid receiving base. The extension direction of the second connecting rod is consistent with the extension direction of the scraper. One end passes through the end of the first connecting rod, and the other end is sleeved on the outer surface of the third connecting rod. The second connecting rod is connected to the first connecting rod and the third connecting rod by a locking bolt. The extension end of the third connecting rod faces the scraper and is connected to the pressing component.

6. The thin film coating and scraping device according to claim 4, characterized in that, The lifting and fine-tuning component includes a guide groove provided in the bearing seat, a limiting hole provided in the liquid receiving base, a screw and a nut. The extension direction of the guide groove is consistent with the height extension direction of the bearing seat. The free end of the screw passes through the guide groove and the limiting hole and is threadedly connected to the nut.

7. The thin film coating and scraping apparatus according to claim 4 or 6, characterized in that, The base is also provided with a lifting component, which adjusts the distance between the liquid receiving base and the base.

8. The thin film coating and scraping apparatus according to claim 7, characterized in that, The lifting assembly includes a transmission rod, a lead screw, and a driving component. The driving component is connected to the end of the transmission rod. The transmission rod is provided with a helical gear that meshes with the lead screw. The lead screws are arranged in pairs and are threadedly connected to the liquid receiving base.

9. The thin film coating and scraping device according to claim 4, characterized in that, The liquid receiving base is provided with a receiving groove, which is located directly below the scraper. The extending direction of the receiving groove is the same as that of the scraper, and the opening of the receiving groove is provided with an elastic guard.

10. The thin film coating and scraping apparatus according to claim 4, characterized in that, The bearing housing is a detachable bearing housing.

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