Coating machine doctor blade structure

Abstract

The utility model discloses a kind of coater doctor blade structures, including pressing plate, support plate, side baffle, handle, scraper and tablet;Pressing plate front is equipped with hydrops groove and overflow slope, PI liquid can be prevented splashing and turbulence;Side baffle is installed in the both sides of pressing plate, prevent PI liquid side flow;Pressing plate is fixed with support plate by bolt, clamps scraper and tablet, clearance is adjustable;The utility model passes through optimizing doctor blade assembly design, effectively controls PI liquid flow, reduces splashing and waste, improves coating uniformity and equipment versatility, while being convenient for maintenance and operation, applicable to high-precision coating demand.

Description

Technical Field

[0001] This utility model relates to the technical field of liquid crystal display panels, and in particular to a scraper structure for a coating machine. Background Technology

[0002] Liquid crystal displays (LCDs) are widely used in various fields due to their significant advantages such as thinness, portability, low voltage and low power consumption, environmental friendliness and radiation-free operation, and high definition. In the production process of LCD panels, the quality and uniformity of the alignment film play a crucial role in display quality. To ensure the uniform alignment of liquid crystal molecules, an alignment film is typically used to achieve precise molecular orientation, thereby guaranteeing the normal display effect of the LCD panel. Polyimide (PI) is a commonly used alignment film material, and during the coating process, the PI liquid needs to be uniformly coated onto the substrate surface using a coating machine. However, in actual coating processes, the high-speed rotation of the coating rollers can easily lead to PI liquid splashing, turbulence, and overflow. These problems not only cause uneven PI film thickness, affecting the display quality of the final product, but also lead to material waste and increased production costs.

[0003] Currently, research on coating quality mainly focuses on improving the uniformity of coating thickness, especially in coating processes in traditional fields such as paper and fabric. For example, existing technologies include devices that achieve coating uniformity by adjusting the angle or position of the doctor blade, and solutions that reduce coating waste through anti-overflow tanks or multi-layer structures. In addition, some technologies optimize the coating process by incorporating transmission components or bubble elimination devices. However, these studies and technologies are mainly applicable to the coating of common materials, with less attention paid to the coating problems of PI alignment films in liquid crystal display panels. Existing PI coating mechanisms have significant shortcomings in preventing liquid splashing, turbulence, and overflow, making it difficult to meet the high precision and high quality requirements of liquid crystal display panel manufacturing.

[0004] Therefore, based on the existing PI coating machine doctor blade structure, there is an urgent need for an improved doctor blade structure that can effectively prevent PI liquid splashing and turbulence. This would solve the problem of uneven coating caused by unstable liquid flow, while reducing material waste and improving the film quality and production efficiency of the PI film. This is not only a requirement for the development of LCD panel manufacturing technology, but also a key technical challenge that the industry urgently needs to solve. Utility Model Content

[0005] The purpose of this invention is to provide a coating machine scraper structure to overcome the shortcomings of the existing technology.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A doctor blade structure for a coating machine. This technical solution, through optimized doctor blade assembly design, achieves effective control of PI liquid flow, improves the coating uniformity of the PI film, and reduces material waste.

[0008] This utility model provides a coating machine scraper structure, including a pressure plate, a support plate, side baffles, a handle, a scraper blade, and a pressure plate. The support plate is bolted to the coating machine scraper support frame, providing fixed support for the entire scraper assembly. The back of the support plate has threaded holes and stepped grooves for assembly with the coating machine scraper support frame, and the front has stepped grooves for mates with the pressure plate. The pressure plate is bolted to the support plate, leaving a gap between them for installing the scraper blade and the pressure plate. Further, the front of the pressure plate has a liquid collection tank and an overflow ramp: the liquid collection tank is located directly below the dripping needle and is used to collect splashed PI liquid, preventing the PI liquid from flowing too fast and directly washing over the anilox roller; the overflow ramp, together with the side baffles and the scraper blade, forms a scraping area, which can retain a certain level of PI liquid and drain the PI liquid overflowing from the liquid collection tank. In addition, the pressure plate has three threaded holes on its side for installing side baffles. The bolt through holes of the side baffles are designed as slots to facilitate adjustment of the gap between them and the anilox roller. The back of the pressure plate has a through groove that cooperates with the stepped groove on the front of the support plate. The clamping force on the scraper and the pressure plate can be adjusted by tightening the bolts.

[0009] Specifically, the side baffles, made of Teflon, are installed on both sides of the pressure plate to prevent PI liquid from flowing out from both sides, reducing material waste. The handles are bolted to the front of the support plate for easy installation and removal of the scraper assembly. The scraper blade, made of polyurethane, is installed between the pressure plate and the pressure plate, with a length similar to the support plate; its gap with the anilox roller can be precisely controlled through adjustment. The pressure plate, made of stainless steel, is installed between the scraper blade and the support plate, providing support for the scraper blade.

[0010] Furthermore, the working principle of this utility model is as follows: S1, PI liquid is dripped uniformly into the liquid accumulation tank on the pressure plate through the dripping needle, and after being filled, it flows into the scraping area through the overflow ramp; S2, the design of the liquid accumulation tank and the overflow ramp effectively slows down the flow rate of the PI liquid, preventing it from directly washing the anilox roller, while recovering the splashed PI liquid and reducing waste; S3, the scraping area is formed by the pressure plate, side baffles and scraper blades, which can retain a certain liquid level of PI liquid, ensuring that excess PI liquid on the surface of the anilox roller is scraped off, while the PI liquid in the cells is retained; S4, when the anilox roller rotates, the scraper blades scrape off excess PI liquid outside the cells, and the PI liquid in the cells is transferred to the coating roller through the squeezing contact between the anilox roller and the coating roller, and finally coated onto the product to form a PI film.

[0011] Specifically, the scraper structure of this utility model has the following innovative features: First, the liquid accumulation tank is designed to be located at a specific position directly below the dripping needle, combined with the tilt angle of the front of the pressure plate, so that the PI liquid gradually slows down and converges into the liquid accumulation tank during the dripping process, thereby avoiding the direct impact of high-speed PI liquid on the anilox roller; Second, the connection between the overflow ramp and the liquid accumulation tank is designed to be a smooth transition, and the height of the overflow ramp is lower than the highest liquid level of the liquid accumulation tank. When the PI liquid in the liquid accumulation tank reaches a certain height, it will automatically flow into the scraping area along the overflow ramp, thereby realizing the recycling of PI liquid; Third, the bolt through holes of the side baffle are designed in the form of slot holes, and the gap between the side baffle and the anilox roller can be adjusted by loosening or tightening the bolts to adapt to different coating requirements; Fourth, the clamping force between the pressure plate and the support plate is adjusted by the degree of bolt tightening, thereby realizing pressure control of the scraper and the pressure plate, and ensuring that the gap between the scraper and the anilox roller is precisely controllable.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] First, the design of the liquid collection tank and overflow ramp effectively recovers splashed PI liquid, reduces turbulence during the coating process, and improves the coating uniformity of the PI film. Second, the splashed PI liquid is recovered and reused, reducing material waste. Third, the handle design facilitates the installation and disassembly of the scraper assembly, making it easy to replace parts. The connection between the components is simple and reliable, facilitating operation and maintenance. Fourth, the gap between the side baffle and the scraper is adjustable, suitable for different coating needs, and improves the versatility of the equipment. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the scraping principle of this utility model;

[0015] Figure 2 This is a schematic diagram of the scraper assembly;

[0016] Figure 3 This is an enlarged view of region A;

[0017] Figure 4 This is a magnified diagram of the explosion in area A;

[0018] Figure 5 This is a structural diagram of the pressure plate;

[0019] Figure 6 This is an enlarged schematic diagram of region C;

[0020] Figure 7 This is a magnified side view of region C;

[0021] Figure 8 This is a magnified schematic diagram of a portion of the scraping area.

[0022] The figure shows: 1. Scraper assembly; 11. Pressure plate; 111. Pressure plate fixing threaded hole; 112. Liquid collection tank; 113. Overflow ramp; 114. Pressing groove; 115. Side baffle fixing threaded hole; 12. Support plate; 13. Side baffle; 14. Handle; 15. Scraper blade; 16. Pressure plate; 2. Anilox roller; 3. Coating roller; 4. Dropping needle. Detailed Implementation

[0023] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0024] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. When the number of elements is referred to as "multiple," it can be any number of two or more. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0026] The present invention will now be described in detail with reference to the embodiments shown in the accompanying drawings:

[0027] like Figure 1As shown, the principle of this invention is achieved through the synergistic action of the anilox roller 2, coating roller 3, dripping needle 4, and doctor blade assembly 1. The doctor blade assembly 1 is positioned slightly above half the height of the anilox roller 2, forming an angle of less than 90 degrees with the surface of the anilox roller 2, and the scraper blade 15 contacts the anilox roller 2. The coating roller 3 is placed below the anilox roller 2 and the doctor blade assembly 1, contacting the anilox roller 2 and creating a certain amount of pressure; both rotate in opposite directions but at the same speed. The dripping needle 4 is positioned above the doctor blade assembly 1, providing PI liquid for coating. S1, during PI coating, the anilox roller 2 rotates, and excess PI liquid on its surface is scraped off by the doctor blade assembly 1 and returned to the scraping area, while the PI liquid within the cells is retained. S2, during the pressure contact with the coating roller 3, the PI liquid within the cells is transferred to the coating roller 3, completing the transfer of PI liquid from the anilox roller 2 to the coating roller 3. S3, the coating roller 3 coats the PI liquid onto the product, forming the desired PI film.

[0028] like Figures 2 to 4 As shown, the scraper assembly 1 includes a pressure plate 11, a support plate 12, a side baffle 13, a handle 14, a scraper blade 15, and a pressure plate 16. The support plate 12 is bolted to the scraper support frame of the coating machine. Its back side has threaded holes and stepped grooves for fitting with the scraper support frame, and its front side has stepped grooves that mate with the pressure plate 11, providing stable support for the entire scraper assembly. The pressure plate 11 is bolted to the support plate 12, leaving a gap between them for mounting the scraper blade 15 and the pressure plate 16. A through groove 114 is formed on the back side of the pressure plate 11, which mates with the stepped groove on the front side of the support plate 12. Tightening the bolts adjusts the clamping force on the scraper blade 15 and the pressure plate 16, and also facilitates the replacement of the scraper blade 15 and the pressure plate 16. The side baffle 13 is bolted to both sides of the pressure plate 11 and is made of Teflon. Its bolt holes are designed as slotted holes to facilitate adjustment of the gap between the side baffle 13 and the anilox roller 2. The handle 14 is fixed to the front of the support plate 12 by bolts, which facilitates the installation and removal of the scraper assembly.

[0029] like Figures 5 to 7 As shown, the design of the pressure plate 11 includes several innovative features. The pressure plate 11 has a liquid collection groove 112 and an overflow ramp 113 on its front side. The liquid collection groove 112 is located directly below the dripping needle 4, distributed from beginning to end, and its cross-sectional shape is as follows... Figure 7 As shown, an overflow ramp 113 at a certain angle is arranged at the lower end. When the PI liquid in the accumulation tank 112 exceeds the height of the overflow ramp 113, the PI liquid will flow into the scraping area through the overflow ramp 113. Three threaded holes 115 are provided on the side of the pressure plate 11 for installing the side baffle 13. The bolt through holes of the side baffle 13 are designed as slots to facilitate adjustment of the gap between it and the anilox roller 2. A through groove 114 is provided on the back of the pressure plate 11, which cooperates with the stepped groove on the front of the support plate 12. The clamping force can be adjusted by tightening the bolts.

[0030] like Figure 8 As shown in a specific embodiment of this utility model, the PI coating process is as follows: S1, several dripping needles 4 begin to drip PI liquid at a uniform speed onto the slope above the collection tank 112, and then it flows into the collection tank 112. After being filled, it flows into the scraping area through the overflow slope 113. This process slows down the flow speed of the PI liquid, preventing the PI liquid from flowing too fast and directly washing over the anilox roller 2. S2, the PI liquid dripping speed always ensures that the height of the PI liquid in the scraping area does not exceed half of the side baffle 13. S3, the rotation of the anilox roller 2 causes the PI liquid in the scraping area to splash, and most of the splashed PI liquid falls into the collection tank 112 or the slope above the collection tank 112. Due to the inclined arrangement of the pressure plate 11, the PI liquid also flows into the collection tank 112 along the slope above the collection tank 112. S4, when the height of the PI liquid in the collection tank 112 exceeds the overflow slope 113, the PI liquid will flow into the scraping area along the overflow slope 113, thereby reducing PI liquid waste. S5, the surface of the anilox roller 2 has a number of evenly distributed holes. When passing through the scraping zone, it can carry a large amount of PI liquid. Then, the scraper 15 scrapes off the excess PI liquid outside the holes. The PI liquid remaining in the holes of the anilox roller 2 will be transferred to the coating roller 3 by the squeezing contact between the anilox roller 2 and the coating roller 3. The coating roller 3 then coats the PI liquid onto the product to form the required PI film.

[0031] The liquid collection tank 112 of this invention is designed with a specific position directly below the dripping needle 4, combined with the tilt angle of the front of the pressure plate 11, so that the PI liquid gradually slows down during the dripping process and converges into the liquid collection tank 112, avoiding direct impact of high-speed PI liquid on the anilox roller 2. The connection between the overflow ramp 113 and the liquid collection tank 112 is designed to be a smooth transition, and the height of the overflow ramp 113 is lower than the highest liquid level of the liquid collection tank 112. When the PI liquid in the liquid collection tank 112 reaches a certain height, it automatically flows into the scraping area along the overflow ramp 113, realizing the recycling of PI liquid. The bolt through holes of the side baffle 13 are designed in the form of slot holes. The gap between the side baffle 13 and the anilox roller 2 can be adjusted by loosening or tightening the bolts to adapt to different coating requirements. The clamping force between the pressure plate 11 and the support plate 12 is adjusted by the tightening of the bolts, thereby realizing pressure control of the scraper 15 and the pressure plate 16, ensuring that the gap between the scraper 15 and the anilox roller 2 is precisely controllable.

[0032] This invention, through the specific embodiments described above, significantly improves the coating quality and production efficiency of PI film. The design of the collection tank 112 and overflow ramp 113 recovers splashed PI liquid, reduces turbulence during coating, and improves the coating uniformity of the PI film. The splashed PI liquid is recovered and reused, reducing material waste. The handle 14 is designed for easy installation and disassembly of the scraper assembly, facilitating component replacement. The connection method between components is simple and reliable, simplifying operation and maintenance. The adjustable gap between the side baffle 13 and the scraper 15 adapts to different coating needs, enhancing the equipment's versatility.

[0033] The scraper structure of this invention also possesses excellent durability and stability. The pressure plate 16 is made of stainless steel, providing not only rigid support for the scraper blade 15 but also resistance to wear and deformation during long-term use. The scraper blade 15 is made of polyurethane, possessing a certain degree of flexibility and wear resistance, enabling it to maintain stable scraping performance during contact with the anilox roller 2. The side baffles 13 are made of Teflon, exhibiting excellent corrosion resistance and a low coefficient of friction, effectively preventing PI liquid from flowing out from both sides while reducing wear on the anilox roller 2.

[0034] The scraper structure of this invention demonstrates excellent applicability in practical applications. By adjusting the gap between the side baffle 13 and the anilox roller 2, it can accommodate PI liquids of different viscosities and flow rates. By adjusting the gap between the scraper blade 15 and the anilox roller 2, it can meet the requirements of different coating thicknesses. This flexibility makes this invention not only suitable for the production of liquid crystal display panels, but also expandable to other industrial fields requiring high-precision coating, such as optical films and functional coatings.

[0035] The design concept of this utility model is also reflected in the consideration of ease of maintenance. The installation position and shape of the handle 14 have been optimized, making the disassembly and installation of the scraper assembly more convenient. The modular connection between the pressure plate 11 and the support plate 12 allows for quick replacement of the scraper blade 15 and the pressure plate 16, thereby reducing equipment downtime and improving production efficiency. In addition, the material selection and surface treatment process of each component have also undergone strict screening to ensure stable performance during long-term use.

[0036] This invention involves in-depth research and optimization of PI liquid flow control. Through the synergistic effect of the liquid collection tank 112, the overflow ramp 113, and the scraping zone, uniform distribution and stable flow of the PI liquid are achieved. This design not only effectively reduces PI liquid splashing and turbulence but also reduces air bubbles generated during coating to a certain extent, thereby further improving the quality and consistency of the PI film.

[0037] The technical solution of this utility model also boasts high economic and environmental benefits. By recovering and reusing splashed PI liquid, material waste is significantly reduced, and production costs are lowered. Optimizing the coating process reduces scrap and rework rates, improving resource utilization. Extending the service life of the doctor blade assembly reduces the frequency of equipment maintenance and replacement, bringing considerable economic benefits to the enterprise.

[0038] The design of this utility model also fully considers the safety and comfort of the operator. The shape and installation position of the handle 14 are ergonomically optimized, making it easier for the operator to install and disassemble the scraper assembly. The gap between the pressure plate 11 and the support plate 12 is reasonably designed to avoid safety hazards caused by loose or detached parts. The material selection and surface treatment process of the side baffle 13 reduce the amount of harmful substances that the operator may come into contact with during cleaning and maintenance.

[0039] In summary, this utility model solves the problems of PI liquid splashing, turbulence and overflow in the prior art through a series of specific structural designs and functional implementation methods, significantly improves the coating quality and production efficiency of PI film, and reduces material waste. It has important practical application value and promising prospects for technology promotion.

[0040] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification. For those skilled in the art, several modifications and improvements can be made without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A coating machine scraper structure, characterized in that: The system includes a pressure plate (11), a support plate (12), a side baffle (13), a handle (14), a scraper (15), and a pressure plate (16). The support plate (12) is bolted to the scraper support frame of the coating machine. The pressure plate (11) is bolted to the support plate (12). A gap is left between the pressure plate (11) and the support plate (12) for installing the scraper (15) and the pressure plate (16). The pressure plate (11) has a liquid accumulation trough (112) and an overflow ramp (113) on its front side. The side baffle (13) is bolted to both sides of the pressure plate (11). The handle (14) is bolted to the front of the support plate (12).

2. The coating machine scraper structure as described in claim 1, characterized in that: The liquid collection tank (112) is located directly below the drip needle (4), and the connection between the liquid collection tank (112) and the overflow ramp (113) is a smooth transition.

3. The coating machine scraper structure as described in claim 2, characterized in that: The height of the overflow ramp (113) is lower than the highest liquid level of the accumulator (112).

4. The coating machine scraper structure as described in claim 1, characterized in that: The bolt through holes of the side baffle (13) are designed as slot holes.

5. The coating machine scraper structure as described in claim 4, characterized in that: The side baffle (13) is made of Teflon.

6. The coating machine scraper structure as described in claim 1, characterized in that: A through groove (114) is opened on the back of the pressure plate (11), and the groove (114) matches the stepped groove on the front of the support plate (12).

7. The coating machine scraper structure as described in claim 6, characterized in that: The clamping force between the pressure plate (11) and the support plate (12) is adjusted by the tightening of the bolts.

8. The coating machine scraper structure as described in claim 1, characterized in that: The scraper (15) is made of polyurethane, and the pressing plate (16) is made of stainless steel.

9. The coating machine scraper structure as described in claim 1, characterized in that: The installation position and shape of the handle (14) have been optimized to facilitate the installation and removal of the scraper assembly.

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