A non-contact cleaning and protection device for slot coating equipment

Abstract

This utility model discloses a non-contact cleaning and protection device for a slot coating equipment, comprising a non-contact cleaning unit (7); the nozzle of the non-contact cleaning unit (7) faces the spraying slot of the slot coating unit (9); the non-contact cleaning unit (7) is connected to the cleaning liquid tank in the feeding unit (1) through a liquid supply pipeline; when the cleaning and protection device is in the cleaning operation state, there is a gap between the nozzle of the non-contact cleaning unit (7) and the slot coating unit (9). Through the non-contact cleaning unit, the residual glue and foreign matter on the blade and surrounding area can be cleaned in time during use, ensuring that the glue dispensing from the blade and inside of the coating head is natural and smooth, reducing the unevenness or stripe-like defects caused by poor glue dispensing in the product, and further reducing damage to the coating head by not directly contacting it.

Description

Technical Field

[0001] This utility model belongs to the technical field of optoelectronic display device manufacturing processes. More specifically, this utility model relates to a non-contact cleaning and protection device for slot coating equipment. Background Technology

[0002] Slot coating, a precision coating technology, works by extruding a coating solution under pressure and flow rate through the slits of a coating mold, transferring it onto the substrate. Compared to other coating methods, slot coating offers numerous advantages, such as high coating speed, high precision, and uniform wet thickness; a closed system that prevents contaminants from entering during coating; high slurry utilization and stable slurry properties; and the ability to perform multi-layer coating simultaneously. By controlling the rate, precisely metering, and pumping the process fluid, coating is achieved. Its high coating speed, good coating uniformity, and wide coating range have expanded its application scope to high-tech fields such as flat panel displays, lithium battery films, touch screens, thin-film solar cells, advanced IC packaging, hydrogen fuel cells, sensors, flexible and printed electronics, and smart glass.

[0003] Currently, the quality of slot coating technologies developed on the market varies greatly, and various problems with adhesive dispensing and coating still exist in practical applications. The disadvantages of existing technologies are:

[0004] Most coating heads currently on the market are imported, which offer high precision but also high maintenance costs. Due to rapid market changes and customer demands for new process verification, when different coating adhesives are needed, the left and right blades of the coating head are prone to crystallization or solidification during use. If not cleaned in time, this can easily cause partial blockage of the coating head, leading to coating defects and batch defects. At the same time, the removal and cleaning of the coating head requires a lot of time and effort; improper removal may damage the coating head, resulting in certain economic losses.

[0005] Using keywords such as "coating; slit; adhesive; cleaning", a search was conducted on existing publicly available technical literature, yielding the following results:

[0006] 1. Chinese patent document: "A slit coating device for flexible ultrathin glass", patent (application) number: 202321930795.7; the technical solution described therein is:

[0007] "The slit coating apparatus for flexible ultrathin glass includes a frame, a feeding mechanism, a coating mechanism, and a discharging mechanism; the coating mechanism includes a glass lifting assembly, a placement platform, a glue injection assembly, a scraper, a drive module, and a thickness detector; the drive module and the thickness detector are mounted on the frame, the glue injection assembly and the scraper are mounted on the drive module, the drive module is used to drive the glue injection assembly and the scraper to move, and the thickness detector is used to detect the thickness of the flexible ultrathin glass; the placement platform is fixed on the drive module, and the glass lifting assembly is mounted on the frame, the glass lifting assembly is used to control the lifting of the flexible ultrathin glass."

[0008] The technical effects described are:

[0009] "Make sure the scraper just touches the upper surface of the flexible ultra-thin glass to avoid gaps between the scraper and the flexible ultra-thin glass, which would result in poor glue application. Also, avoid the scraper and the flexible ultra-thin glass squeezing against each other, which would cause the flexible ultra-thin glass to deform."

[0010] 2. Chinese patent document: "A cleaning device and cleaning method for a slit extrusion coating head", patent (application) number: 202110628951.3; the technical solution described therein is:

[0011] "The cleaning device for the slit extrusion coating head includes: a coating nozzle cleaning mechanism located below the coating head and adapted to the coating head, the coating nozzle cleaning mechanism being equipped with a drive mechanism that drives it to reciprocate along the length direction of the coating head; wherein, the coating nozzle cleaning mechanism includes a cleaning scraper assembly and a cleaning nozzle assembly."

[0012] The technical effects described are:

[0013] "The cleaning blade assembly is compatible with the coating nozzle of the coating head, and the cleaning blade assembly and the cleaning nozzle assembly work together to clean the coating nozzle of the coating head, so as to solve the problem that high viscosity coating liquid is not easy to clean and is easy to clog the coating head, and achieve the purpose of simple structure, reasonable design and simple operation."

[0014] However, the technical solutions described in the aforementioned technical documents, as well as the existing publicly available technical solutions, have not been able to solve the problems and defects in the prior art, such as "the coating head cannot be cleaned well" and "the coating quality is easily reduced". Utility Model Content

[0015] This utility model provides a non-contact cleaning and protection device for slot coating equipment, the purpose of which is to better clean the coating nozzle and protect it.

[0016] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0017] This utility model relates to a non-contact cleaning and protection device for slot coating equipment. The slot coating equipment includes a feeding unit and a slot coating unit. The cleaning and protection device is equipped with a non-contact cleaning unit. The nozzle of the non-contact cleaning unit faces the spraying slot of the slot coating unit. The non-contact cleaning unit is connected to the cleaning liquid tank in the feeding unit through a liquid supply pipeline. When the cleaning and protection device is in the cleaning operation state, there is a gap between the nozzle of the non-contact cleaning unit and the slot coating unit.

[0018] The lower part of the non-contact cleaning unit is mounted on a base with a guide rail, so that the non-contact cleaning unit moves along the spray slit of the slit coating unit; during the movement, the gap between the nozzle of the non-contact cleaning unit and the slit coating unit remains unchanged.

[0019] The slot coating unit is connected to the feeding tank in the feeding unit via a feeding pipeline.

[0020] The slit coating unit is connected to the waste glue tank in the waste liquid recovery unit via a waste glue discharge pipeline.

[0021] The non-contact cleaning and protection device is equipped with a blade immersion tank; the blade immersion tank is connected to the cleaning liquid tank in the feeding unit through a drain pipe.

[0022] A lifting device is provided at the lower part of the immersion tank.

[0023] The immersion tank is connected to the waste glue tank in the waste liquid recovery unit via a waste liquid recovery pipeline.

[0024] Below the slit coating unit, a waste glue tank is provided; the waste glue tank is connected to the waste glue container in the waste liquid recovery unit through a waste liquid recovery pipeline.

[0025] The non-contact cleaning unit is connected to the pressure control unit via pipelines.

[0026] This utility model adopts the above-mentioned technical solution, and its structure and operation are relatively simple and easy to implement, highly practical, and easy to promote. Through the non-contact cleaning unit, residual glue and foreign matter on the blade and surrounding area can be cleaned in time during use, ensuring that the glue dispensing from the blade and inside the coating head is natural and smooth, reducing the unevenness or streaks caused by poor glue dispensing in the product. Moreover, it does not directly contact the coating head, further reducing damage to the coating head. The addition of the protective tank can extend the service life of the coating head to a certain extent. When the equipment is not used for a long time or is in standby mode, the coating head protection function can be selected to prevent the coating head from being exposed to the air for a long time. The design of the protective device can form a protection for the process carrier platform below the coating head. Liquid or glue overflowing from the slit coating head and the protective tank can be returned to the waste liquid recovery tank through the glue discharge pipe, which has a good effect on improving the overall internal environment of the slit coating. Attached Figure Description

[0027] The following is a brief explanation of the contents shown in the attached figure and the markings therein:

[0028] Figure 1 This is a schematic diagram of the main body of the slot coating equipment;

[0029] Figure 2 This is a front view of the coating head protection device unit;

[0030] The diagram is marked as follows:

[0031] 1. Feeding unit, 2. Waste liquid recovery unit, 3. Lifting device, 4. Dipping tank, 5. Base with guide rail, 6. Waste glue tank, 7. Non-contact cleaning unit, 8. Pressure control unit, 9. Slit coating unit, 10. Drainage pipe. Detailed Implementation

[0032] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, so as to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention.

[0033] like Figure 1 , Figure 2 The structure shown in this utility model is a non-contact cleaning and protection device for a slot coating equipment. The slot coating equipment includes a feeding unit 1 and a slot coating unit 9.

[0034] The device also includes a cleaning unit (which includes a non-contact cleaning unit 7, a base with guide rails 5, a pneumatic control device 8, and a waste glue tank 6), a knife immersion protection unit (which includes a knife immersion tank 4, a lifting device 3, and a drain pipe 10), and a waste liquid recovery unit 2.

[0035] This utility model's slot coating device features a non-contact cleaning and protection system that effectively protects against adhesive leakage problems in existing coating processes. It employs a non-contact cleaning method to ensure timely cleaning of the blade and surrounding adhesive residue during use. Additionally, a coating protection tank is added, allowing for head protection when the equipment is not in use for extended periods or is in standby mode, preventing the coating head from being exposed to air for extended periods.

[0036] The following is a detailed and specific analysis: In order to solve the problems and overcome the defects of the existing technology, and to achieve the invention objective of better cleaning and protecting the coating nozzle, the technical solution adopted by this utility model is as follows:

[0037] like Figure 1 , Figure 2 As shown, this utility model discloses a non-contact cleaning and protection device for slot coating equipment. The cleaning and protection device is equipped with a non-contact cleaning unit 7. The nozzle of the non-contact cleaning unit 7 faces the spraying slot of the slot coating unit 9. The non-contact cleaning unit 7 is connected to the cleaning liquid tank in the material supply unit 1 through a liquid supply pipeline. When the cleaning and protection device is in the cleaning operation state, there is a gap between the nozzle of the non-contact cleaning unit 7 and the slot coating unit 9.

[0038] During the cleaning process, the cleaning device does not directly contact the coating head, thus avoiding damage to the coating head and extending its service life. The cleaning agent is mainly sprayed onto the coating head using air pressure. After cleaning, the return stroke is switched to pure gas to dry the cleaned coating head, preventing detergent residue from affecting the subsequent coating effect.

[0039] The non-contact cleaning unit can promptly clean the blade and surrounding area of ​​residual glue and foreign matter during use, ensuring smooth and natural glue dispensing from the blade and interior of the coating head. This reduces defects such as unevenness or streaks caused by poor glue dispensing. Furthermore, it does not directly contact the coating head, further minimizing damage to the coating head.

[0040] The lower part of the non-contact cleaning unit 7 is mounted on the guide rail base 5 via a guide rail, so that the non-contact cleaning unit 7 moves along the spraying slit of the slit coating unit 9; during the movement, the gap value between the nozzle of the non-contact cleaning unit 7 and the slit coating unit 9 remains unchanged.

[0041] The above technical solution can effectively avoid various process defects in existing slot coating technologies, such as poor glue dispensing from the coating head, in-plane defects, vertical streaks, and poor coating appearance. This utility model has a simple structure, is easy to operate, highly practical, and easy to promote; compared with existing slot coating machines, it adds cleaning and protective functions. It can continuously provide protection during production without stopping the machine to wipe the coating head, effectively improving production efficiency.

[0042] The slit coating unit 9 is connected to the feeding tank in the feeding unit 1 via a feeding pipeline.

[0043] The slit coating unit 9 is connected to the waste glue tank in the waste liquid recovery unit 2 via a waste glue discharge pipeline.

[0044] Liquid or adhesive overflowing from the slot coating head and protective tank can be returned to the waste liquid tank through the adhesive discharge pipe, which has a good effect on improving the overall internal environment of slot coating.

[0045] like Figure 2 As shown:

[0046] The non-contact cleaning and protection device is equipped with a blade immersion tank 4; the blade immersion tank 4 is connected to the cleaning liquid tank in the feeding unit 1 through a drain pipe 10.

[0047] When the equipment is not used for a long time or is in standby mode, the coating head protection function can be selected to prevent the coating head from being exposed to the air for a long time, which can extend the service life of the coating head to a certain extent.

[0048] The dipping solution can be added through the drain pipe 10, which can adjust the rate of addition to ensure that the evaporation and addition of the dipping solution match, and that the coating head is always submerged in the dipping tank 4, thereby better protecting the coating head.

[0049] A lifting device 3 is provided at the lower part of the soaking tank 4.

[0050] After cleaning, if coating will not be performed for a long time or the coating work has been completed, the cleaned coating head can be moved horizontally above the dip tank 4 and then lowered to a certain height, or raised to a certain height by the lifting device 3, to ensure that the coating can be completely submerged in the dip solution in the dip tank 4, thereby protecting the coating head.

[0051] The immersion tank 4 is connected to the waste glue tank in the waste liquid recovery unit 2 via a waste liquid recovery pipeline.

[0052] The addition of the dip trough 4, i.e. the protective trough, can extend the service life of the coating head to a certain extent. When the equipment is not used for a long time or is in standby mode, the coating head protection function can be selected to prevent the coating head from being exposed to the air for a long time. The design of the protection device can form a protection for the process carrier platform below the coating head.

[0053] Below the slot coating unit 9, a waste adhesive tank 6 is provided; the waste adhesive tank 6 is connected to the waste adhesive container in the waste liquid recovery unit 2 via a waste liquid recovery pipeline. This effectively prevents droplets or adhesive from overflowing and significantly improves the overall internal environment of the slot coating unit.

[0054] The cleaned waste liquid can be directly recycled into the waste liquid recycling unit 2 through the glue discharge pipe. The waste liquid recycling unit 2 is equipped with an adjustable negative pressure device to ensure that the waste liquid in the glue discharge pipe can be recycled smoothly.

[0055] The non-contact cleaning unit 7 is connected to the pressure control unit 8 via a pipeline.

[0056] The pressure of the nozzle of the non-contact cleaning unit 7 is adjusted by the pressure control unit 8.

[0057] The specific implementation scheme of this utility model is as follows:

[0058] During coating, the coating adhesive is supplied from the supply tank (container) in the supply unit 1 to the slit coating unit 9 under a certain pressure and flow rate, and then squeezed out along the slit head (slit coating unit 9) and transferred to the substrate surface, thereby completing the coating.

[0059] After coating is completed or if no coating is applied for a long time, the coating head (slit coating unit 9) can be moved horizontally above the cleaning unit; before cleaning, the coating head should be lowered to a position above the non-contact cleaning unit 7, so that the two devices do not come into contact.

[0060] During cleaning, the non-contact cleaning unit 7 sprays cleaning agent onto the nozzle of the slot coating unit 9; at the same time, the non-contact cleaning unit 7 moves along the nozzle via the guide rail base 5 to clean the adhesive on the edge of the nozzle.

[0061] After cleaning, the non-contact cleaning unit 7 sprays pure gas onto the coating head during its return process to blow away and dry any residual detergent on the coating head, thus preventing the residual detergent from adversely affecting the subsequent coating effect.

[0062] The present invention has been described above with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A non-contact cleaning and protection device for a slot coating equipment, the slot coating equipment comprising a feeding unit (1) and a slot coating unit (9), characterized in that: The cleaning and protection device is equipped with a non-contact cleaning unit (7); the nozzle of the non-contact cleaning unit (7) is directed toward the spraying slit of the slit coating unit (9); the non-contact cleaning unit (7) is connected to the cleaning liquid tank in the material supply unit (1) through a liquid supply pipeline; when the cleaning and protection device is in the cleaning operation state, there is a gap between the nozzle of the non-contact cleaning unit (7) and the slit coating unit (9).

2. The non-contact cleaning and protection device for the slot coating equipment according to claim 1, characterized in that: The lower part of the non-contact cleaning unit (7) is mounted on the guide rail base (5) via a guide rail, so that the non-contact cleaning unit (7) moves along the spray slit of the slit coating unit (9); during the movement, the gap value between the nozzle of the non-contact cleaning unit (7) and the slit coating unit (9) remains unchanged.

3. The non-contact cleaning and protection device for the slot coating equipment according to claim 1, characterized in that: The slit coating unit (9) is connected to the feeding tank in the feeding unit (1) via a feeding pipeline.

4. The non-contact cleaning and protection device for the slot coating equipment according to claim 1, characterized in that: The slit coating unit (9) is connected to the waste glue tank in the waste liquid recovery unit (2) through a waste glue discharge pipeline.

5. The non-contact cleaning and protection device for the slot coating equipment according to claim 1, characterized in that: The non-contact cleaning and protection device is equipped with a immersion tank (4); the immersion tank (4) is connected to the cleaning liquid tank in the feeding unit (1) through a drain pipe (10).

6. The non-contact cleaning and protection device for the slot coating equipment according to claim 5, characterized in that: A lifting device (3) is provided at the lower part of the soaking tank (4).

7. The non-contact cleaning and protection device for the slot coating equipment according to claim 5, characterized in that: The immersion tank (4) is connected to the waste glue tank in the waste liquid recovery unit (2) through a waste liquid recovery pipeline.

8. The non-contact cleaning and protection device for the slot coating equipment according to claim 1, characterized in that: Below the slit coating unit (9), a waste glue tank (6) is provided; the waste glue tank (6) is connected to the waste glue container in the waste liquid recovery unit (2) through a waste liquid recovery pipeline.

9. The non-contact cleaning and protection device for the slot coating equipment according to claim 1, characterized in that: The non-contact cleaning unit (7) is connected to the pressure control unit (8) via a pipeline.

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