Synchronous secondary coating device used in scraper coating process
By using a synchronous secondary coating device and a fine-tuning slider and a spiral fine-tuner, precise control of the coating width and thickness is achieved, solving the problem of wet film edge shrinkage, improving coating success rate and product quality consistency, and reducing production costs.
Patent Information
- Application Number
- CN202522708159.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-22
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2035-12-22
AI Technical Summary
During the blade coating process, when the wet film thickness increases or the amount of slurry additives increases, the wet film is prone to shrinkage on both sides of the coating direction, which can lead to the film winding or cracking on both sides, reducing the sample or product yield. Existing solutions are costly, complex, or inefficient.
A synchronous secondary coating device is designed, including a main coating tool, a mounting component, a fine-tuning slider, and a spiral fine-tuner. Through the cooperation of the fine-tuning slider and the connecting rod, the coating width and thickness can be precisely controlled. The device includes a detachable fine-tuning slider and a spiral fine-tuner to ensure the accuracy and stability of the coating process.
It significantly inhibits wet film edge shrinkage, improves the uniformity and integrity of film products, increases coating success rate and sample acceptance rate, reduces scrap rate and production cost, and enhances process stability and product quality consistency.
Smart Images
Figure CN223832733U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of thin film preparation equipment technology, and in particular to a synchronous secondary coating device for the doctor blade coating process. Background Technology
[0002] Doctor blade coating is a technique that uses a doctor blade to evenly apply a slurry to the surface of a substrate to form a wet film with a specific and uniform thickness. It is widely used in photovoltaic coatings, functional thin films and other fields.
[0003] In the field of functional thin films, in order to improve the function of sample thin films, it is usually necessary to change the wet film thickness or the amount of slurry additives. When the wet film coating thickness increases or the amount of slurry additives increases, the coating direction (MD) sides will shrink inward during the wet film drying process, causing the film to roll up or crack on both sides, which greatly reduces the sample or product yield and has a serious negative effect on the experimental cycle or production cost.
[0004] Currently, conventional solutions to this problem mainly focus on optimizing the slurry formulation (such as adding leveling agents), adjusting the drying process profile (such as lowering the initial drying temperature), or performing multiple coatings. However, these methods have significant limitations: optimizing the formulation is costly and may affect the intrinsic properties of the film; adjusting the process has limited effect and may prolong the production cycle; while multiple coatings involve complex processes, alignment difficulties, and low efficiency.
[0005] In view of this, based on years of experience in production design in this and related fields, the inventor has designed a synchronous secondary coating device for the doctor blade coating process through repeated experiments, in order to solve the problems existing in the prior art. Utility Model Content
[0006] The purpose of this invention is to provide a synchronous secondary coating device for the doctor blade coating process, which can effectively improve the success rate of doctor blade coating and the final functional film sample yield.
[0007] To achieve the above objectives, this utility model proposes a synchronous secondary coating device for the doctor blade coating process, wherein the synchronous secondary coating device comprises:
[0008] The main coating tool is used to coat the slurry onto the substrate surface;
[0009] Two mounting pieces are fixed to the main coating tool at intervals, the mounting pieces are parallel to the main coating tool, and the two mounting pieces protrude from both sides of the main coating tool respectively;
[0010] Two fine-tuning sliders are located on both sides of the main coating tool and are aligned and clamped on the two mounting parts. Each fine-tuning slider includes a slider body, a positioning element, and a cutting head. The positioning element is disposed on the slider body and can detachably fix the slider body to the mounting part. The cutting head is mounted on the slider body and performs secondary coating on the side of the slurry.
[0011] In the synchronous secondary coating device for the blade coating process described above, the blade head is mounted on the slider body via a spiral fine adjuster, which drives the blade head to move and adjusts the distance between the blade head and the substrate surface.
[0012] As described above, the synchronous secondary coating device for the doctor blade coating process includes a spiral fine-tuning device comprising a fixed cross block, a coarse adjustment bolt, and a fine adjustment bolt. A first bolt hole is formed within the slider body, perpendicular to the substrate surface and penetrating the slider body. The coarse adjustment bolt passes through the first bolt hole and is threadedly engaged with the slider body. The coarse adjustment bolt has an axially penetrating second bolt hole, and the fine adjustment bolt passes through the second bolt hole and is threadedly engaged with the coarse adjustment bolt. The blade head is connected via the fixed cross block to the end of the fine adjustment bolt facing the substrate surface.
[0013] In the synchronous secondary coating device for the scraper coating process described above, the fixed cross block is suspended on the slider body by an elastic component and abuts against the fine-tuning bolt.
[0014] As described above, in the synchronous secondary coating device for the scraper coating process, two elastic components are arranged side by side between the fixed horizontal block and the slider body, and the two ends of each elastic component are respectively connected to the fixed horizontal block and the slider body.
[0015] As described above, in the synchronous secondary coating device for the doctor blade coating process, the lower end of the fine-tuning bolt is provided with an axially extended micrometer screw, and the fine-tuning bolt abuts against the fixed cross block through the micrometer screw.
[0016] The synchronous secondary coating device for the blade coating process described above, wherein the blade tip is inclined to the surface of the substrate.
[0017] In the synchronous secondary coating device for the blade coating process described above, the angle between the blade tip and the substrate surface ranges from 0.6° to 0.8°.
[0018] The synchronous secondary coating device for the doctor blade coating process described above further includes a connecting rod, which is arranged parallel to the main coating tool. A through hole is provided on the slider body, and the connecting rod passes through the through hole and slides in cooperation with the slider body.
[0019] The synchronous secondary coating device for the doctor blade coating process described above, wherein the connecting rod has an axially arranged scale line for confirming the distance between the two sliders.
[0020] Compared with the prior art, the present invention has the following features and advantages:
[0021] This invention proposes a synchronous secondary coating device for the doctor blade coating process. By providing a secondary coating device that is easy to assemble and disassemble and operates synchronously, it effectively overcomes the technical problem of wet film edge shrinkage during doctor blade coating. The device achieves precise control of the coating width and secondary coating thickness through the cooperation of the fine-tuning slider and the connecting rod, thereby significantly suppressing the inward shrinkage of the film edge during the drying process and improving the overall uniformity and integrity of the film product. At the same time, its modular design and convenient disassembly and assembly characteristics enable the device to be flexibly adapted to laboratory research and development and large-scale production lines. Without affecting the existing coating process, it significantly improves the coating success rate and sample acceptance rate, reduces the scrap rate and production cost caused by morphological defects, and enhances process stability and product quality consistency. Attached Figure Description
[0022] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of this invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, under the guidance of this invention, can select various possible shapes and proportions to implement this invention according to specific circumstances.
[0023] Figure 1 This is a left view of the coating device of this utility model;
[0024] Figure 2 This is a right view of the coating device of this utility model;
[0025] Figure 3 This is a top view of the coating device of this utility model;
[0026] Figure 4 This is a front view of the slider of the coating device of this utility model;
[0027] Figure 5 This is a left view of the slider of the coating device of this utility model;
[0028] Figure 6 This is a right view of the slider of the coating device of this utility model;
[0029] Figure 7 This is a top view of the slider of the coating device of this utility model;
[0030] Figure 8 This is a schematic diagram showing the overall position of the non-horizontal cutter head and coating device of this utility model;
[0031] Figure 9 This is a schematic diagram of the spiral fine-tuner of the coating device of this utility model;
[0032] Figure 10 This is a schematic diagram of the slider connecting rod of the coating device of this utility model;
[0033] Figure 11 This is a schematic diagram of the overall device during the coating operation of the coating device of this utility model.
[0034] Explanation of reference numerals in the attached figures
[0035] 100. Synchronous secondary coating device; a. Angle; 1. Fine adjustment screw; 2. Coarse adjustment screw; 3. Non-horizontal cutter head; 5. Elastic component; 6. Fixed cross block; 7. Micrometer screw; 10. Main coating cutter; 13. Main cutter; 14. First coating height; 15. Second coating height; 20. Mounting component; 30. Fine adjustment slider; 31. Slider body; 32. Positioning component; 33. Cutter head; 34. Spiral fine adjuster; 40. Connecting rod. Detailed Implementation
[0036] The details of this utility model can be more clearly understood by referring to the accompanying drawings and the description of specific embodiments. However, the specific embodiments of this utility model described herein are for illustrative purposes only and should not be construed as limiting the utility model in any way. Under the teachings of this utility model, those skilled in the art can conceive of any possible modifications based on this utility model, and these should all be considered to fall within the scope of this utility model.
[0037] like Figures 1 to 11 As shown, this utility model proposes a synchronous secondary coating device 100 for use in the doctor blade coating process, wherein the synchronous secondary coating device includes:
[0038] The main coating tool 10 is used to coat the slurry onto the substrate surface 200.
[0039] Two mounting pieces 20 are spaced apart on the main coating tool 10. The mounting pieces 20 are parallel to the main coating tool 10, and the two mounting pieces 20 protrude from both sides of the main coating tool 10 respectively.
[0040] Two fine-tuning sliders 30 are located on both sides of the main coating tool 10 and are aligned and clamped on two mounting parts 20. The fine-tuning slider includes a slider body 31, a positioning part 32 and a cutting head 33. The slider body 31 is slidably sleeved on the outside of the mounting part 20. The positioning part 32 is set on the slider body 31 and can fix the slider body 31 on the mounting part 20. The mounting part 20 has a certain length for the slider body 31 to clamp and adjust. The cutting head 33 is installed on the slider body 31 and performs secondary coating on the side of the slurry.
[0041] This invention proposes a synchronous secondary coating device 100 for use in the doctor blade coating process. By setting up a mounting part 20 and two independently adjustable fine-tuning sliders 30, it can be easily installed on the existing main coating blade 10 and perform synchronous secondary coating on both sides of the wet film of the slurry. This effectively suppresses the shrinkage phenomenon of the film edge during the drying process, improves the width consistency of the coated film and the yield. At the same time, the synchronous secondary coating device 100 has a simple structure and flexible adjustment, making it suitable for both laboratory environments and easy to integrate into production lines.
[0042] In an optional embodiment of this utility model, the cutter head 33 is mounted on the slider body 31 by a spiral fine adjuster 34. The spiral fine adjuster 34 drives the cutter head 33 to move and adjusts the distance between the cutter head 33 and the substrate surface 200.
[0043] The screw fine adjuster 34 drives the cutter head 33 to move, so as to precisely adjust the distance between the cutter head 33 and the substrate surface 200. This enables micron-level precise control of the secondary coating thickness, thereby effectively controlling the shrinkage of the wet film edge during the drying process.
[0044] In one alternative embodiment, the spiral fine adjuster 34 includes a fixed cross block 6, a coarse adjustment bolt 2, and a fine adjustment bolt 1. A first bolt hole is provided in the slider body 31, which is perpendicular to the substrate surface and extends through the slider body 31. The coarse adjustment bolt 2 extends through the first bolt hole and is threadedly engaged with the slider body 31. The coarse adjustment bolt 2 has an axially extending second bolt hole. The fine adjustment bolt 1 extends through the second bolt hole and is threadedly engaged with the coarse adjustment bolt 2. The cutter head 33 is connected to the end of the fine adjustment bolt 1 facing the substrate surface via the fixed cross block 6.
[0045] Using the above structure, the coarse adjustment bolt 2 is first rotated to screw in or out of the slider body 31, achieving a preliminary large-range adjustment of the cutter head 33 height. Then, the fine adjustment bolt 1 is rotated to perform a fine screwing-in or screwing-out movement within the second bolt hole of the coarse adjustment bolt 2, ultimately driving the cutter head 33 to achieve a micron-level precise adjustment of the distance from the substrate surface by 200 mm. The spiral fine adjuster 34, through the series cooperation of the coarse and fine adjustment bolts, can achieve a two-stage adjustment function for the cutter head 33 height, ensuring both a wide adjustment range and micron-level control accuracy of the final height. Its compact structure effectively reduces error accumulation.
[0046] Furthermore, during adjustment, the coarse adjustment bolt 2 can be used to move the cutter head 33 to contact the substrate surface 200, then return it to the non-contact state, and then the fine adjustment bolt 1 can be used to make the cutter head 33 contact the substrate surface 200 again.
[0047] In an optional example, the spiral fine-tuner 34 is provided with scale lines to indicate the distance between the cutter head 33 and the substrate surface 200.
[0048] In an optional example, an elastic member 5 is provided between the fixed horizontal block 6 and the slider body 31. One end of the elastic member 5 is fixedly connected to the fixed horizontal block 6, and the other end of the elastic member 5 is fixedly connected to the slider body 31. With the above structure, the fixed horizontal block 6 is suspended below the fine-tuning bolt 1 by the two elastic members 5. When the fine-tuning bolt 1 moves up and down, the fixed horizontal block 6 also drives the cutter head 33 to move up and down.
[0049] Specifically, the fixed cross block 6 is suspended below the fine-adjustment bolt 1 by two elastic components 5. The two elastic components 5 are arranged side by side and together provide a continuous upward pulling force. This pulling force ensures that the fixed cross block 6 can always maintain a precise fit with the fine-adjustment bolt 1, thereby ensuring the accuracy and stability of the position of the cutter head 33 connected to the fixed cross block 6 during height adjustment and operation.
[0050] In an optional example, the elastic component 5 is a spring.
[0051] In an optional example, a micrometer screw 7 is provided between the fixed cross block 6 and the fine-tuning bolt 1. The micrometer screw 7 is coaxially arranged with the fine-tuning bolt 1 and fixedly connected to the lower end of the fine-tuning screw 1.
[0052] When adjusting the position of the cutter head 33 using the micrometer screw 7, the micrometer screw 7 mainly controls the position of the fixed cross block 6 on the slider body 31, thereby controlling the distance between the cutter head 33 and the substrate surface. When adjusting the micrometer screw to the "0" mark, the cutter head 33 is in contact with the substrate surface 200 using the micrometer screw 1. The reading on the micrometer screw 34 at this time is recorded as the "0" mark. It should be noted that the "0" mark is a relative reference, and its corresponding absolute reading may vary depending on the installation. Assuming this experiment requires adjusting the secondary coating thickness to 100 μm, the reading when adjusting to "0" is "4.910 mm". When adjusting the secondary coating thickness, adjusting the reading to "5.010 mm" will achieve the desired secondary coating thickness.
[0053] In one optional embodiment of this invention, the tip of the cutter head 33 is inclined to the substrate surface 200. By setting the tip of the cutter head 33 to be inclined to the substrate surface, the contact state and flow characteristics between the cutter head 33 and the slurry are effectively improved, reducing slurry accumulation and residue at the tip and reducing slurry loss; at the same time, the inclined tip helps to form a more uniform coating edge and improves the edge morphology of the wet film. Furthermore, by adjusting the angle between the cutter head 33 and the coating direction, the flow direction of excess slurry during the secondary coating process can be controlled, allowing for optimization of the slurry flow state and distribution uniformity during the coating process according to slurry characteristics and process requirements.
[0054] In one alternative embodiment, the angle α between the tip of the blade 33 and the substrate surface 200 ranges from 0.6° to 0.8°, so that the tip and the substrate surface 200 form a stable inclined contact relationship, ensuring that the blade maintains optimal contact with the slurry and the substrate during the coating process.
[0055] In an optional embodiment of this utility model, the synchronous secondary coating device 100 further includes a connecting rod 40, which is arranged parallel to the main coating tool 10. A through hole is provided on the slider body 31, and the connecting rod 40 passes through the through hole and slides in cooperation with the slider body 31.
[0056] In an optional example, the connecting rod 40 has axially arranged scale lines. These scale lines are evenly distributed along the length of the connecting rod 40 and are used to precisely indicate the installation positions of the two fine-tuning sliders 30 on the mounting component 20. In use, the operator adjusts the distance between the two fine-tuning sliders 30 according to the final sample width requirements, referring to the scale lines on the connecting rod 40, and fixes the slider body 31 to the designated position on the mounting component 20 using the positioning component 32, thereby achieving adaptive adjustment for substrates of different widths. By setting axial scale lines on the connecting rod 40, an intuitive and accurate distance measurement benchmark is provided, enabling the operator to quickly and accurately adjust the relative distance between the two fine-tuning sliders 30, ensuring that the secondary coating width perfectly matches the sample specifications, and improving the accuracy and efficiency of the device adjustment.
[0057] In one optional embodiment of this utility model, the fine-tuning slider 30 is provided with a receiving groove, the mounting member 20 passes through the receiving groove, and the positioning member 32 is a fastening bolt, which fixes the fine-tuning slider body 31 to the mounting member 20.
[0058] Please refer to Figures 1 to 11 As shown, the specific implementation process of the synchronous secondary coating device 100 proposed in this utility model will now be described in detail with reference to an embodiment.
[0059] I. Before using the synchronous secondary coating device 100:
[0060] 1. Wipe the cutter head 33 to remove surface dust and residual slurry. In this step, the cutter head 33 can also be soaked in slurry solvent and then cleaned with alcohol.
[0061] 2. Install the cutter head 33 on the slider body 31, align and assemble the two slider bodies 31 on the two mounting parts 20, so that the connecting rod 40 can pass horizontally through the two slider bodies 31. According to the final sample width, adjust the distance between the two fine-tuning sliders 30 with reference to the scale on the connecting rod 40. After the position of the fine-tuning slider 30 is determined, fix the slider body 31 to the mounting part 20 through the positioning part 32 to fix the fine-tuning slider 30.
[0062] 3. Adjust the screw fine adjuster 34 on the fine adjustment slider 30. First, make the cutter head 33 contact the substrate surface (coated substrate) 200 through coarse adjustment, then return it to the non-contact state. Then, make the cutter head 33 contact the substrate surface 200 through fine adjustment. At this time, the reading on the screw fine adjuster 34 is recorded as "0".
[0063] 4. Adjust the height of the two cutter heads 33 from the substrate surface, and use a silicone feeler gauge for calibration.
[0064] II. Synchronous secondary coating device 100 in normal use:
[0065] Start the main coating tool 10 and perform a first coating through the main blade 13 of the main coating tool 10. The height of the first coating is H1. Then, perform a second coating simultaneously through the blades 33 on the two fine-tuning sliders 30. The height of the second coating is H2. Observe the effect of the second coating on both sides in the MD direction. If it is too thin, increase the thickness of the second coating, and vice versa. At the same time, pay attention to the degree of inward shrinkage of the second coating side during the wet film baking process. Adjust the spiral fine-tuner 34 to control the thickness of the second coating to achieve the ideal state.
[0066] III. Disassembly and Storage:
[0067] 1. Prioritize adjusting the spiral fine adjuster 34 on the fine adjustment slider 30 to retract the cutter head 33, so as to avoid the cutter head 33 from colliding with the substrate surface 200 during disassembly;
[0068] 2. Adjust the positioning part 32 of the fine-tuning slider 30 on the synchronous secondary coating device 100 to separate the mounting part 20 from the fine-tuning slider 30.
[0069] 3. Remove the fine-tuning slider 30 from the connecting rod 40;
[0070] 4. Wipe the residual slurry on the fine-tuning slider 30 and the cutter head 33 with a wiping cloth. If it cannot be wiped clean, soak the slider in a solvent that can dissolve the slurry.
[0071] The present invention proposes a synchronous secondary coating device 100 for the doctor blade coating process, which can simultaneously complete the main body coating and edge compensation in a single coating process and can be precisely controlled in real time, so as to fundamentally suppress shrinkage while ensuring process efficiency and coating quality.
[0072] The detailed explanations of the above embodiments are intended only to explain the present invention so as to facilitate a better understanding of the present invention. However, these descriptions should not be construed as limiting the present invention for any reason. In particular, the various features described in different embodiments can be arbitrarily combined with each other to form other embodiments. Unless there is an explicit description to the contrary, these features should be understood to be applicable to any embodiment, and not limited to the described embodiments.
Claims
1. A synchronous secondary coating device for a doctor blade coating process, characterized in that, The synchronous secondary coating device includes: The main coating tool is used to coat the slurry onto the substrate surface; Two mounting pieces are fixed to the main coating tool at intervals, the mounting pieces are parallel to the main coating tool, and the two mounting pieces protrude from both sides of the main coating tool respectively; Two fine-tuning sliders are located on both sides of the main coating tool and are aligned and clamped on the two mounting parts. Each fine-tuning slider includes a slider body, a positioning element, and a cutting head. The positioning element is disposed on the slider body and can detachably fix the slider body to the mounting part. The cutting head is mounted on the slider body and performs secondary coating on the side of the slurry.
2. The synchronous secondary coating device for the doctor blade coating process as described in claim 1, characterized in that, The cutter head is mounted on the slider body via a spiral fine adjuster, which drives the cutter head to move and adjusts the distance between the cutter head and the substrate surface.
3. The synchronous secondary coating device for the doctor blade coating process as described in claim 2, characterized in that, The spiral fine adjuster includes a fixed cross block, a coarse adjustment bolt, and a fine adjustment bolt. A first bolt hole is provided in the slider body, which is perpendicular to the substrate surface and extends through the slider body. The coarse adjustment bolt extends through the first bolt hole and is threadedly engaged with the slider body. The coarse adjustment bolt has an axially extending second bolt hole. The fine adjustment bolt extends through the second bolt hole and is threadedly engaged with the coarse adjustment bolt. The cutter head is connected to the end of the fine adjustment bolt facing the substrate surface through the fixed cross block.
4. The synchronous secondary coating device for the doctor blade coating process as described in claim 3, characterized in that, The fixed crossbar is suspended on the slider body by an elastic component and abuts against the fine-tuning bolt.
5. The synchronous secondary coating device for the doctor blade coating process as described in claim 4, characterized in that, Two elastic components are arranged side by side between the fixed horizontal block and the slider body, and the two ends of each elastic component are respectively connected to the fixed horizontal block and the slider body.
6. The synchronous secondary coating device for the doctor blade coating process as described in claim 5, characterized in that, The lower end of the fine-tuning bolt is provided with an axially extended micrometer screw, and the fine-tuning bolt abuts against the fixed cross block through the micrometer screw.
7. The synchronous secondary coating device for the doctor blade coating process as described in claim 1, characterized in that, The tip of the cutter head is inclined to the surface of the substrate.
8. The synchronous secondary coating device for the doctor blade coating process as described in claim 7, characterized in that, The angle between the blade tip and the substrate surface ranges from 0.6° to 0.8°.
9. The synchronous secondary coating device for the doctor blade coating process as described in claim 1, characterized in that, The synchronous secondary coating device also includes a connecting rod, which is arranged parallel to the main coating tool. The slider body has a through hole, through which the connecting rod passes and slides in cooperation with the slider body.
10. The synchronous secondary coating device for the doctor blade coating process as described in claim 9, characterized in that, The connecting rod has axially set scale lines for confirming the distance between the two sliders.