A film coating device and its production line

Abstract

The utility model relates to thin film coating technical field especially relates to a kind of thin film coating device and its production line, including workbench;The workbench surface is equipped with drying mechanism, and two fixed plates are symmetrically equipped;Two the fixed plate between fixed loading box, rotationally connected coating roller;Two the fixed plate between rotationally connected support roller also, the support roller is located just below coating roller. The utility model is through setting support roller, the micro adsorption hole on its surface forms smaller uniform adsorption force to film, cooperate with self rotation, avoid support roller rotation, film skidding, while support roller makes film keep slightly stretched state, eliminates wrinkle and prevents excessive deformation, ensure that film is flat and enters coating area at uniform speed;Eliminate gap and bubble, solve the key problem that traditional coating skids and causes coating uneven, realize coating precision and high efficiency.

Description

Technical Field

[0001] This utility model relates to the field of thin film coating technology, and in particular to a thin film coating apparatus and its production line. Background Technology

[0002] In the field of thin film coating production, traditional thin film coating equipment typically relies on support rollers to transport the film and coating rollers to complete the coating transfer. However, its structural design has significant technical defects, making it difficult to meet the requirements of high-precision coating. Specifically, traditional support rollers only serve a basic support function and lack a synchronous drive structure for the film. This leads to the phenomenon of the support roller rotating and the film slipping during the film transport process. Due to the lack of stable synchronous force between the film and the support roller, their rotational speeds cannot be matched, causing speed fluctuations when the film enters the coating area. This results in uneven coating thickness or the presence of tiny gaps between the film and the support roller surface, allowing air to be easily drawn into the coating during coating, forming bubbles and damaging the coating integrity. Utility Model Content

[0003] The purpose of this invention is to provide a film coating device that solves the problem of uneven coating caused by slippage and gaps between the film and the support roller.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A thin film coating apparatus includes a worktable; a drying mechanism is provided on the surface of the worktable, and two fixed plates are symmetrically arranged; a loading box is fixed between the two fixed plates and a coating roller is rotatably connected; a support roller is also rotatably connected between the two fixed plates, and the support roller is located directly below the coating roller; the support roller is cylindrical and has uniformly opened micro-adsorption holes on its surface, and a first external pipeline is provided inside; the thin film passes through the gap between the support roller and the coating roller, and the support roller supports the thin film and makes it in a slightly stretched state; the first external pipeline creates a negative pressure inside the support roller, which generates an adsorption force on the thin film through the micro-adsorption holes, and the thin film moves synchronously when the support roller rotates, avoiding slippage that could lead to uneven coating or the formation of bubbles.

[0005] Preferably, both ends of the support roller are fixedly connected to connecting pipe shafts, which rotate through the fixing plate via bearings; a fixing block is fixedly connected to the side of the fixing plate away from the support roller, and the fixing block is used to fix the pipeline structure.

[0006] Preferably, the side wall of the fixed plate is provided with a driving component, which includes a motor and a gear set; the gear set is respectively connected to the output end of the motor and the connecting tube shaft, and the motor drives the support roller to rotate through the gear set.

[0007] Preferably, an isolation plate is fixedly connected to the center inside the support roller, and the isolation plate divides the inside of the support roller into an upper space and a lower space that are not interconnected; the first external pipeline is provided in the upper space, and a second external pipeline is provided in the lower space, the second external pipeline being used to introduce high-pressure gas to clean the micro-adsorption pores.

[0008] Preferably, the first external pipeline includes an air intake pipe, a first circular pipe, and a first connector; the bottom of the air intake pipe is fixedly connected to the isolation plate, and the end is fixedly connected to the first circular pipe, and the two are adapted to the internal space of the support roller in a "Z" shape; the end of the first circular pipe away from the air intake pipe passes through the connecting pipe shaft and is rotatably sealed, the first circular pipe also passes through the fixing block, and the first connector is fixedly connected to the end of the first circular pipe that extends out of the fixing block.

[0009] Preferably, the second external pipe has the same shape and is centrally symmetrical with the first external pipe, including an outlet pipe, a second circular pipe and a second connector; the top of the outlet pipe is fixedly connected to the isolation plate, and the end is fixedly connected to the second circular pipe; the end of the second circular pipe away from the outlet pipe passes through another connecting pipe shaft and is rotatably sealed, and the second circular pipe also passes through a fixing block; the second connector is fixedly connected to the end of the second circular pipe that extends out of the fixing block, and is connected to an external high-pressure gas source through the external pipe, which is used to transmit high-pressure gas.

[0010] Preferably, the top of the suction pipe has uniformly spaced suction holes, which are connected to the space above the support roller to enhance the negative pressure adsorption effect.

[0011] Preferably, the micro-adsorption holes are evenly distributed along the circumferential and axial directions on the outer surface of the support roller to ensure uniform adsorption force on the film; the height of the loading box is adapted to the coating roller so that the outer surface of the coating roller can contact the coating solution in the loading box to adhere the solution.

[0012] Preferably, a pressure stabilizing tank (10-20L capacity) and a proportional regulating valve are installed in the pipeline connecting the vacuum equipment and the external pipe. Together with a pressure sensor (accuracy ±0.0005MPa), they form a closed-loop control to control the negative pressure fluctuation within ±0.0005MPa, thereby stabilizing the pressure of the vacuum equipment and avoiding inconsistent adsorption forces of micropores in different areas. This further avoids the phenomenon of deep deformation in areas with strong adsorption forces and shallow deformation in areas with weak adsorption forces, ultimately resulting in uneven "striped" coating.

[0013] Preferably, the rotary seal between the two ends of the support roller and the first and second round tubes adopts a combination of double-lip skeleton oil seal and O-ring seal to avoid negative pressure leakage.

[0014] A production line includes the aforementioned film coating apparatus.

[0015] This utility model has at least the following beneficial effects: By setting up a support roller, micro-adsorption holes are generated on its surface, forming a small and uniform adsorption force on the film. Combined with its own rotation, it prevents the film from slipping when the support roller rotates. At the same time, the support roller keeps the film in a slightly stretched state, eliminating wrinkles and preventing excessive deformation, ensuring that the film enters the coating area smoothly and at a uniform speed. It eliminates gaps and bubbles, solves the core problem of uneven coating caused by slippage in traditional coating, and achieves precise and efficient coating. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the coating roller structure of this utility model; Figure 3 This is a schematic diagram of the support roller structure of this utility model; Figure 4 This is a cross-sectional view of the support roller of this utility model; Figure 5 This is a schematic diagram of the isolation plate structure of this utility model; Figure 6 This is a cross-sectional view of the isolation plate of this utility model.

[0018] In the diagram: 1. Workbench; 2. Drying mechanism; 3. Loading box; 4. Fixing plate; 5. Support roller; 51. Connecting pipe shaft; 6. Isolation plate; 7. External pipe; 8. First external pipe; 81. Suction pipe; 82. First round pipe; 83. First connector; 9. Second external pipe; 91. Exhaust pipe; 92. Second round pipe; 93. Second connector; 10. Fixing block; 11. Coating roller; 12. Drive component. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0021] Reference Figure 1-6 A thin film coating apparatus includes a worktable 1; a drying mechanism 2 is provided on the surface of the worktable 1, and two fixed plates 4 are symmetrically arranged; a loading box 3 is fixed between the two fixed plates 4 and a coating roller 11 is rotatably connected; a support roller 5 is also rotatably connected between the two fixed plates 4, and the support roller 5 is located directly below the coating roller 11; the support roller 5 is cylindrical and has uniformly opened micro-adsorption holes on its surface, and a first external pipeline 8 is provided inside it; the thin film passes through the gap between the support roller 5 and the coating roller 11, and the support roller 5 supports the thin film and makes it slightly stretched; the first external pipeline 8 creates a negative pressure inside the support roller 5, which generates an adsorption force on the thin film through the micro-adsorption holes. When the support roller 5 rotates, it drives the thin film to move synchronously, avoiding slippage that could lead to uneven coating or the formation of bubbles.

[0022] It should be noted that the adsorption effect of the micropores only causes slight, uniform depressions with a depth of ≤0.1μm (0.0001mm) on the film surface. This depth is 10% of the upper limit of coating thickness deviation (1μm), ensuring that the coating can completely fill the depressions. Moreover, the depression depth is much smaller than the allowable range of coating thickness deviation (usually the coating thickness deviation requirement is ±1μm, i.e. 0.001mm, and the depression depth is controlled within 10% of the upper limit of deviation). At the same time, the coating roller 11 is coated with a 0.1-0.2mm thick elastic silicone layer, which can fully adapt to the slight uniform depressions of the film. The coating can spread and fill the depressions and non-depressions evenly, presenting a uniform state overall, and there is no local coating thickness difference caused by adsorption depressions.

[0023] It should be noted that: "slightly stretched state" means that the tension of the film at the support roller 5 is 5-15N, ensuring no wrinkles and no excessive deformation; the pore diameter of the micro-adsorption holes is 0.1-0.5mm, and the pore spacing is 2-5mm; the negative pressure range is -0.02 to -0.05MPa, ensuring that the adsorption force is sufficient to drive the film to move synchronously without causing the film to deform.

[0024] Furthermore, both ends of the support roller 5 are fixedly connected to connecting pipe shafts 51, which rotate through the fixing plate 4 via bearings; a fixing block 10 is fixedly connected to the side of the fixing plate 4 away from the support roller 5, and the fixing block 10 is used to fix the pipeline structure.

[0025] It should be noted that: the bearing is a deep groove ball bearing, model 6204-2RS, to ensure the rotation accuracy of the support roller 5; the fixing block 10 is made of 45 steel and is rigidly connected to the fixing plate 4 by bolts to ensure the stability of the pipeline.

[0026] Furthermore, the side wall of the fixed plate 4 is provided with a driving component 12, which includes a motor and a gear set; the gear set is respectively connected to the output end of the motor and the connecting tube shaft 51, and the motor drives the support roller 5 to rotate through the gear set.

[0027] It should be noted that: the motor is a servo motor with a rated speed of 100-500rpm and a control accuracy of ±0.1rpm; the gear set is a helical gear transmission with a transmission ratio of 1:3-1:5 and a tooth backlash of ≤0.01mm, ensuring that the speed of the support roller 5 is stable and without fluctuation.

[0028] Furthermore, an isolation plate 6 is fixedly connected to the center of the support roller 5, which divides the interior of the support roller 5 into an upper space and a lower space that are not interconnected; the first external pipe 8 is provided in the upper space, and the lower space is provided with a second external pipe 9, which is used to introduce high-pressure gas to clean the micro-adsorption pores.

[0029] It should be noted that: the isolation plate 6 is made of 304 stainless steel. The isolation plate 6 is rigidly connected to the suction pipe 81 and the exhaust pipe 91. The support roller 5 rotates relative to the fixed plate 4 through the deep groove ball bearing (model 6204-2RS) on the connecting pipe shaft 51. The isolation plate 6 does not rotate synchronously with the support roller 5. The isolation plate 6 is covered with a wear-resistant fluororubber sealing layer to ensure complete isolation between the upper and lower spaces. The volume ratio of the upper and lower spaces is 1:1 to avoid mutual interference between the negative pressure adsorption and high-pressure blowing functions.

[0030] Furthermore, the first external pipeline 8 includes an air intake pipe 81, a first circular pipe 82, and a first connector 83; the bottom of the air intake pipe 81 is fixedly connected to the isolation plate 6, and the end is fixedly connected to the first circular pipe 82, and the two are in a "Z" shape to adapt to the internal space of the support roller 5; the end of the first circular pipe 82 away from the air intake pipe 81 passes through the connecting pipe shaft 51 and is rotatably sealed, the first circular pipe 82 also passes through the fixing block 10, and the first connector 83 is fixedly connected to the end of the first circular pipe 82 that extends out of the fixing block 10.

[0031] Furthermore, the second external pipe 9 has the same shape and is centrally symmetrical with the first external pipe 8, including an outlet pipe 91, a second circular pipe 92, and a second connector 93; the top of the outlet pipe 91 is fixedly connected to the isolation plate 6, and the end is fixedly connected to the second circular pipe 92; the end of the second circular pipe 92 away from the outlet pipe 91 passes through another connecting pipe shaft 51 and is rotatably sealed, and the second circular pipe 92 also passes through the fixing block 10; the second connector 93 is fixedly connected to the end of the second circular pipe 92 that extends out of the fixing block 10, and is connected to an external high-pressure gas source through an external pipe 7, the two ends of the external pipe 7 being used to transmit high-pressure gas and generate negative pressure, respectively.

[0032] Furthermore, the top of the suction pipe 81 has uniformly spaced suction holes, which are connected to the space above the support roller 5 to enhance the negative pressure adsorption effect.

[0033] It should be noted that the diameter of the suction holes is 1-3mm, and the number is 6-12. They are evenly distributed along the axial direction of the suction pipe 81 and completely cover the projection area of ​​the micro-adsorption holes on the surface of the support roller 5 to ensure uniform transmission of negative pressure.

[0034] Furthermore, the micro-adsorption holes are evenly distributed along the circumferential and axial directions on the outer surface of the support roller 5 to ensure uniform adsorption force on the film; the height of the loading box 3 is adapted to the coating roller 11 so that the outer surface of the coating roller 11 can contact the coating solution in the loading box 3 to adhere the solution.

[0035] Furthermore, a pressure stabilizing tank (10-20L capacity) and a proportional regulating valve are installed in the pipeline connecting the vacuum equipment and the external pipe 7. Together with a pressure sensor (accuracy ±0.0005MPa), they form a closed-loop control to control the negative pressure fluctuation within ±0.0005MPa, thereby stabilizing the pressure of the vacuum equipment and avoiding inconsistent adsorption forces of micropores in different areas. This further prevents areas with strong adsorption forces from deforming deeply and areas with weak adsorption forces from deforming shallowly, ultimately resulting in an uneven "striped" coating.

[0036] It should be noted that: the pressure stabilizing tank is made of 304 stainless steel, with a working pressure of -0.1MPa; the proportional regulating valve has an adjustment range of 0-100% and a response time of ≤50ms; the pressure sensor is installed at the suction end of the first external pipeline 8 to ensure real-time monitoring and adjustment of negative pressure.

[0037] Furthermore, the rotary seal between the two ends of the support roller 5 and the first circular tube 82 and the second circular tube 92 adopts a combination seal of double-lip skeleton oil seal and O-ring to avoid negative pressure leakage.

[0038] It should be noted that: the skeleton oil seal model is TC40×62×12, and the material is nitrile rubber (NBR); the O-ring material is fluororubber, and the working temperature is -20℃ to 120℃, ensuring no leakage under alternating negative and high pressure conditions.

[0039] It should be noted that the film is conveyed through the unwinding and rewinding mechanisms at both ends and is dried using a drying process. These technical functions and structures are common knowledge in the field and can be understood without the need for this application to provide additional specific technical details.

[0040] A production line includes the aforementioned film coating apparatus.

[0041] In summary, the coating solution to be coated is loaded into the loading box 3 on the workbench 1, ensuring that the solution volume meets the coating requirements. Simultaneously, the installation status of each component is checked to ensure that the coating roller 11 and support roller 5 rotate flexibly, the first external pipeline 8 is securely connected to the external vacuum equipment, and the second external pipeline 9 is securely connected to the external high-pressure air source, and the drive unit 12 is powered normally. One end of the film to be coated is passed through the gap between the coating roller 11 and the support roller 5, and the film position is adjusted so that the film is slightly stretched at the support roller 5, ensuring that the film is flat and wrinkle-free.

[0042] After the device is started, the coating roller 11 begins to rotate in accordance with the subsequent film conveying rhythm. Its surface comes into contact with the coating solution in the loading box 3. During the rotation, the coating solution is evenly attached to the outer surface of the coating roller 11, forming a solution film to be transferred to the film, thus completing the solution preparation before coating.

[0043] The motor of the drive unit 12 is started, and the motor transmits power to the connecting pipe shafts 51 at both ends of the support roller 5 through the gear set, driving the support roller 5 to rotate stably around its own axis. At the same time, the external vacuum equipment is started, and the upper space inside the support roller 5 is evacuated through the first external pipe 8, so that the upper space forms a negative pressure. Under the action of negative pressure, the micro-adsorption holes on the surface of the support roller 5 generate a small adsorption force on the contact film, and lightly fix the film to the surface of the support roller 5. As the support roller 5 rotates, the adsorption force drives the film to move synchronously, avoiding slippage between the support roller 5 and the film, and ensuring uniform and stable film conveying.

[0044] As the film passes through the gap between the coating roller 11 and the support roller 5 at a constant speed along with the support roller 5, the coating solution pre-attached to the surface of the coating roller 11 comes into contact with the surface of the film to be coated, and the solution is evenly transferred onto the film to complete the coating operation.

[0045] During device operation, an external high-pressure gas source is simultaneously activated, and high-pressure gas is introduced into the lower space inside the support roller 5 through the second external pipeline 9. The high-pressure gas is ejected outward through the micro-adsorption holes on the surface of the support roller 5, using the gas penetration effect to clean any coating solution or impurities that may remain in the adsorption holes, preventing clogging of the micro-adsorption holes, ensuring uniform adsorption force, and ensuring stable film conveying and coating effects.

[0046] After coating, the film continues to be conveyed and enters the drying mechanism 2 on the surface of the workbench 1. The coating on the film is dried and cured by the drying mechanism 2, and finally the coated film product is obtained.

[0047] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A thin film coating apparatus, characterized in that, Includes a workbench; the workbench surface is provided with a drying mechanism and two fixed plates are symmetrically arranged; a loading box is fixed between the two fixed plates and a coating roller is rotatably connected; a support roller is also rotatably connected between the two fixed plates, and the support roller is located directly below the coating roller; the support roller is cylindrical and has uniformly opened micro-adsorption holes on its surface, and a first external pipeline is provided inside it. The film passes through the gap between the support roller and the coating roller. The support roller supports the film and keeps it in a stretched state. The first external pipeline creates a negative pressure inside the support roller, which generates an adsorption force on the film through micro-adsorption holes. When the support roller rotates, it drives the film to move synchronously, avoiding slippage that could lead to uneven coating or the formation of bubbles.

2. The thin film coating apparatus according to claim 1, characterized in that, Both ends of the support roller are fixedly connected to connecting pipe shafts, which rotate through the fixed plate via bearings; a fixing block is fixedly connected to the side of the fixed plate away from the support roller, and the fixing block is used to fix the pipeline structure.

3. The thin film coating apparatus according to claim 2, characterized in that, The side wall of the fixed plate is provided with a driving component, which includes a motor and a gear set; the gear set is respectively connected to the output end of the motor and the connecting tube shaft, and the motor drives the support roller to rotate through the gear set.

4. A thin film coating apparatus according to claim 3, characterized in that, The support roller is fixedly connected to the center of the partition plate, which divides the inside of the support roller into an upper space and a lower space that are not connected to each other; the first external pipeline is located in the upper space, and the lower space is provided with a second external pipeline, which is used to introduce high-pressure gas to clean the micro-adsorption pores.

5. A thin film coating apparatus according to claim 1, characterized in that, The first external pipeline includes an air intake pipe, a first circular pipe, and a first connector; the bottom of the air intake pipe is fixedly connected to the isolation plate, and the end is fixedly connected to the first circular pipe, and the two are adapted to the internal space of the support roller in a "Z" shape; the end of the first circular pipe away from the air intake pipe passes through the connecting pipe shaft and is rotatably sealed, the first circular pipe also passes through the fixing block, and the first connector is fixedly connected to the end of the first circular pipe that extends out of the fixing block.

6. A thin film coating apparatus according to claim 4, characterized in that, The second external pipe is identical in shape to the first external pipe and is centrally symmetrical, including an outlet pipe, a second circular pipe, and a second connector; the top of the outlet pipe is fixedly connected to the isolation plate, and the end is fixedly connected to the second circular pipe; the end of the second circular pipe away from the outlet pipe passes through another connecting pipe shaft and is rotatably sealed, and the second circular pipe also passes through a fixing block; the second connector is fixedly connected to the end of the second circular pipe that extends out of the fixing block, and is connected to an external high-pressure gas source through the external pipe, which is used to transmit high-pressure gas.

7. A thin film coating apparatus according to claim 5, characterized in that, The top of the suction pipe has uniformly spaced suction holes, which are connected to the space above the support roller to enhance the negative pressure adsorption effect.

8. A thin film coating apparatus according to claim 2, characterized in that, The micro-adsorption holes are evenly distributed along the circumferential and axial directions on the outer surface of the support roller to ensure uniform adsorption force on the film; the height of the loading box is adapted to the coating roller so that the outer surface of the coating roller can contact the coating solution in the loading box to adhere the solution.

9. A production line, characterized in that, Includes the film coating apparatus according to any one of claims 1 to 8.

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