Improved PI coating machine scraper structure

Abstract

The utility model discloses an improved PI coating machine scraper structure which comprises a supporting plate installed on a coating machine, the supporting plate is provided with a pressing plate, a scraper blade is arranged between the supporting plate and the pressing plate in a press fit mode, a plurality of liquid overflowing grooves which are arranged at equal intervals are formed in one side wall of the pressing plate, and a liquid accumulating groove which is concave inwards is formed in the front face of the pressing plate. One end of the top of the overflow groove extends towards the extension edge of the liquid accumulation groove, and the other end of the overflow groove extends towards the back surface of the pressing plate for pressing the scraper; the scraper can prevent PI liquid from splashing, the designed liquid accumulating groove can recycle the splashing PI liquid, the PI liquid flows into a liquid scraping area through the liquid overflowing groove to be continuously used, flowing of the PI liquid can be reduced, and therefore the thickness of the PI liquid scraped and coated on the anilox roller is more uniform.

Description

TECHNICAL FIELD

[0001] The utility model relates to liquid crystal display panel production related technical field especially, a kind of improved PI coating machine doctor blade structure. BACKGROUND

[0002] Liquid crystal display (LCD) is widely used in various industries due to its light, thin, portable, low voltage, micro power consumption, environmental protection, no radiation and high definition and other significant advantages. In the production and manufacturing of liquid crystal display panel, liquid crystal is not simply sandwiched between two glass substrates. This method is difficult to achieve uniform molecular arrangement, so it needs to rely on alignment film to ensure the uniform arrangement of liquid crystal molecules, so as to ensure normal display. Therefore, the film quality and film thickness uniformity of the alignment film are crucial to the display quality of the liquid crystal display panel. In the coating process of PI alignment film, due to the rotation of the coating roller, it is easy to cause the splashing and flowing of PI liquid, which will cause uneven PI film coating and waste materials, and seriously affect the quality of PI film.

[0003] At present, there are many researches on coating machine in various industries, for example:

[0004] 1. The comma doctor blade glue uniformity adjusting device (publication number CN218013809) puts forward a kind of comma doctor blade glue uniformity adjusting device, which keeps the blade of comma doctor blade straight by setting adjusting bolt in the inside of comma doctor blade, so as to realize the uniformity of glue thickness;

[0005] 2. The doctor blade structure of a kind of glass coating machine (publication number CN220310873U) puts forward a kind of doctor blade structure with adjustable height on both sides, which makes the doctor blade structure and the base material relatively parallel by arranging infrared micro distance adjusting device on both sides of roller doctor blade, detecting whether the position is offset by infrared, and adjusting by regulator, so as to make the base material coating uniform;

[0006] 3. The doctor blade adjusting device of a kind of coating machine (publication number CN220590531U) puts forward a kind of doctor blade adjusting device which can adjust the inclination angle of doctor blade and the distance between doctor blade and roller, which adjusts the inclination angle of doctor blade by arranging adjustable knob on both sides of doctor blade and fixing with doctor blade shaft, and adjusts the distance between doctor blade and roller shaft by arranging gear shaft system, so as to ensure the uniformity of coating;

[0007] 4. The gap adjusting mechanism, comma doctor blade coating head and coating machine (publication number CN115430566U) put forward a kind of gap adjusting mechanism which embeds transmission assembly in roller seat, which can make the whole gap adjusting mechanism beautiful and simple;

[0008] 5. A coating machine glue doctor adjusting device (publication number CN119016299A) proposes a method of arranging several independently adjustable position doctor mechanisms on the doctor roll to achieve precise adjustment of the gap between the glue doctor and the coating substrate, which can make the glue coating uniform and improve the coating quality;

[0009] 6. A comma doctor coating equipment anti-glue overflow device (publication number CN212441888U) proposes a device of arranging multiple anti-glue overflow grooves at the bottom of the doctor roll and the backing roll to avoid glue overflow from the side, thereby reducing the waste of coating;

[0010] 7. A comma coater suitable for eliminating bubbles (publication number CN21812879U) proposes a method of arranging a bubble elimination device in the coater to reduce the glue viscosity and improve the glue side flowability, which can eliminate bubbles in the glue and prevent streaks on the film material when coating glue with high viscosity.

[0011] In summary, the current research on product coating quality improvement in various industries mainly focuses on the uniformity of film thickness, especially for paper, cloth and other products, while the research on liquid crystal display panel alignment film PI coating is relatively less. Therefore, based on the existing PI coating mechanism, there is an urgent need to design a coating mechanism that can prevent PI liquid splashing and flowing (which will cause unevenness of PI film coating) and material waste. Utility model content

[0012] The utility model aims at providing an improved PI coating machine doctor structure to overcome the deficiencies in the prior art.

[0013] In order to achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0014] An improved PI coating machine doctor structure, comprising a pressing plate, a support plate, a side baffle, a handle, a doctor blade and a pressing piece. The support plate is installed on the coating machine doctor support frame by bolts to provide support for the pressing plate, side baffle, handle, doctor blade and pressing piece, etc.; the front surface of the pressing plate is provided with a liquid accumulation groove for recovering splashed PI liquid, and is also provided with an overflow groove to reduce the liquid flow in the liquid scraping area and to discharge the overflowed PI liquid in the liquid accumulation groove; the pressing plate and the support plate are fixed by bolts, and the gap left between them is installed with the pressing piece and the doctor blade; the side baffle is installed on both sides of the pressing plate to prevent PI liquid from flowing out from both sides, causing waste and affecting; the handle is installed on the front surface of the support plate by bolts, which facilitates the installation and removal of the doctor blade assembly.

[0015] Further, the back surface of the support plate is provided with bolt holes and stepped grooves specially assembled with the coating machine doctor support frame, and the front surface is provided with stepped grooves matched with the pressing plate.

[0016] Further, the pressing plate is slightly shorter than the supporting plate, a plurality of bolt holes are formed in the pressing plate and fixed with the supporting plate, a recess is formed in the back of the pressing plate and penetrates the pressing plate, and the recess is just matched with the front stepped groove of the supporting plate, and the pressing plate can press the tablet and the scraping blade by tightening the bolt, and the pressure can be adjusted.

[0017] Further, the front of the pressing plate is provided with a liquid accumulation groove for collecting the splashed PI liquid, and a plurality of liquid overflow grooves are formed in the pressing plate and are in communication with the liquid accumulation groove, and the liquid overflow grooves are used for reducing the PI liquid flow between the anilox roller and the scraping blade and discharging the PI liquid in the liquid accumulation groove.

[0018] Further, bolt holes are formed in the side of the pressing plate and used for mounting the side baffle, the side baffle is made of Teflon material, the bolt through holes of the side baffle are formed into slot holes, and the gap between the side baffle and the anilox roller can be adjusted.

[0019] Further, the scraping blade is made of polyurethane material, is mounted between the pressing plate and the pressing tablet, has a length similar to the length of the supporting plate, and the gap between the scraping blade and the anilox roller can be adjusted.

[0020] Further, the pressing plate is made of stainless steel material, has the same length as the scraping blade, is mounted between the scraping blade and the supporting plate, and provides support for the scraping blade.

[0021] Compared with the prior art, the utility model has the advantages that:

[0022] The scraping knife can prevent the PI liquid from splashing, the designed liquid accumulation groove can recover the splashed PI liquid, the PI liquid can continue to be used by flowing into the scraping area through the liquid overflow groove, the PI liquid flow can be reduced, and therefore the PI liquid thickness scraped on the anilox roller is more uniform.

[0023] Additional aspects and advantages of the utility model will be partially given in the following description, some will become obvious from the following description, or will be understood by the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is the coating principle drawing of the utility model;

[0025] Figure 2 is the structural schematic view of the scraping knife assembly;

[0026] Figure 3 is the enlarged schematic view of A;

[0027] Figure 4 is the enlarged explosion schematic view of A;

[0028] Figure 5 is the structural schematic view of the pressing plate;

[0029] Figure 6is a magnified schematic view of C;

[0030] Figure 7 is a magnified schematic view of a cross section at B;

[0031] Figure 8 is a magnified schematic view of a liquid scraping area.

[0032] BRIEF DESCRIPTION OF DRAWINGS 1, scraper assembly; 11, pressing plate; 111, pressing plate fixing bolt hole; 112, hydrops groove; 113, overflow groove; 114, pressing groove; 115, side baffle fixing bolt hole; 12, support plate; 13, side baffle; 14, handle; 15, scraping piece; 16, pressing piece; 2, anilox roller; 3, glass substrate; 4, drop needle; 41, front door frame; 42, vacuum exhaust pipeline; 43, front movable door; 44, high-pressure cylinder; 5, junction box; 6, top layer gas collection box; 7, heat insulation gap; 8, wiring pipeline; 9, heat dissipation exhaust assembly; 91, heat dissipation exhaust port; 92, air inlet hole; 10, drain pipe. DETAILED DESCRIPTION

[0033] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one skilled in the art that the present application can be practiced without some or all of these specific details. In other instances, well known process steps have not been described in detail in order to avoid unnecessarily obscuring the present application. It will be apparent to one skilled in the art that the present application can be practiced without some or all of these specific details. In other instances, well known process steps have not been described in detail in order to avoid unnecessarily obscuring the present application. In the following description, specific terminology will be used for the purpose of description and is not intended to limit the application. The description and accompanying drawings are intended to provide a comprehensive understanding of the application.

[0034] It should be noted that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can also be present. When an element is referred to as being "comprise a plurality of" it can be any number of two or more. The terms "vertical", "horizontal", "left", "right" and similar expressions as used herein are for the purpose of description only and are not intended to limit the application.

[0035] 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 application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The use of the terms "and / or" includes a combination of one or more of the associated listed items.

[0036] The present application will be described in detail below with reference to the embodiments shown in the drawings.

[0037] As Figures 1-8 shown, an improved PI coating machine scraper structure is provided in the embodiment.

[0038] As Figure 1 shown, a coating principle simplified diagram of an improved PI coating machine scraper structure of the utility model, including scraper assembly 1, anilox roll 2, glass substrate 3 and drop needle 4. Scraper assembly 1 is arranged at two-thirds height of anilox roll 2, and the included angle with the surface of anilox roll 2 is less than 90 degrees, and a certain gap is left. Glass substrate 3 is arranged directly below anilox roll 2, and glass substrate 3 flows horizontally along the rotation direction of anilox roll 2, and the flow sheet speed is consistent with anilox roll 2. Drop needle 4 is arranged above scraper assembly 1, and provides liquid for coating. When PI liquid is coated, anilox roll 2 rotates, and the excess PI liquid on the surface is scraped off by the scraper, and the PI liquid left on the surface of anilox roll 2 is finally left on the glass substrate through the extrusion of anilox roll 2 and the glass substrate, so as to form a liquid PI film.

[0039] As Figure 2 , Figure 3 , Figure 4 shown, the scraper assembly includes pressing plate 11, support plate 12, side baffle 13, handle 14, scraper blade 15 and pressing plate 16, support plate 12 is installed on the coating machine scraper support frame by bolts, the front face step groove cooperates with the scraper support frame to provide stable support for scraper assembly 1, pressing plate 11 is fixed with support plate 12 by bolts, and scraper blade 15 and pressing plate 16 are clamped, scraper blade 15 and pressing plate 16 are detachably fixed between pressing plate 11 and support plate 12. Pressing plate 16 is placed between scraper blade 15 and support plate 12. The recess on the back of pressing plate 11 cooperates with the step groove on the front of support plate 12, so that the clamping force can be adjusted by bolts, and it is also convenient to replace scraper blade 15 and pressing plate 16. Side baffle 13 is installed on both sides of pressing plate 11 by bolts, and the distance between the end of side baffle 13 and anilox roll 2 can be adjusted by loosening the bolts, moving side baffle 13 and then fixing it. Handle 14 is fixed on the front of support plate 12 by bolts, which is convenient for replacing or disassembling the scraper assembly.

[0040] As Figure 5 , Figure 6 shown, pressing plate 11 is provided with pressing plate fixing bolt hole 111, liquid accumulation groove 112, overflow groove 113, recess 114 and side baffle fixing bolt hole 115, pressing plate fixing bolt hole 111 penetrates from the front of pressing plate 11 to the recess 114 on the back, the length of liquid accumulation groove 112 is less than the length of pressing plate 11, and the cross-sectional shape is Figure 7As shown, the side wall of the pressing plate 11 close to the anilox roller 2 is provided with a plurality of evenly arranged overflow grooves 113, and one end of the top of the plurality of evenly arranged overflow grooves 113 extends to the extension edge of the liquid accumulation groove 112, and the other end extends to the side of the pressing plate 11 for pressing the doctor blade 15. Specifically, when the PI liquid in the liquid accumulation groove 112 exceeds the height of the opening of the overflow groove 113, the PI liquid will flow into the liquid scraping area through the overflow groove 113. That is, the overflowed PI liquid will flow onto the extension edge 15 of the doctor blade through the overflow groove 113, and then be coated.

[0041] As an embodiment of the present application: during PI coating, the anilox roller 2 rotates, and the plurality of liquid droplet needles 4 start to uniformly drop PI liquid into the liquid scraping area, and the dropping amount always ensures that the height of the PI liquid in the liquid scraping area does not exceed half of the side baffle 13. Due to the rotation of the anilox roller 2, the PI liquid in the liquid scraping area will splash, and most of the splashed PI liquid will fall into the liquid accumulation groove 112 or above the liquid accumulation groove 112. Since the pressing plate 11 is inclined, the PI liquid will also flow into the liquid accumulation groove 112 through the front surface of the pressing plate 11. When the height of the PI liquid in the liquid accumulation groove 112 exceeds the height of the opening of the overflow groove 113, the PI liquid will flow into the liquid scraping area through the overflow groove 113, thereby preventing waste of PI liquid. The surface of the anilox roller 2 has many lines, which can carry a large amount of PI liquid. After the excess PI liquid is scraped off by the doctor blade 15, the PI liquid remaining on the surface of the anilox roller 2 will contact the glass substrate 3 through the rotation of the anilox roller 2, and then be extruded to finally remain on the glass substrate, thereby forming a liquid PI film.

[0042] The technical features of the above-mentioned embodiments can be combined in any way. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present application. For those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. An improved PI coater doctor blade structure characterized by: The application relates to a supporting plate installed on a coating machine, wherein the supporting plate is provided with a pressing plate, a scraping plate is arranged between the supporting plate and the pressing plate, a plurality of liquid overflow grooves are arranged on one side wall of the pressing plate at equal intervals, a liquid accumulation groove is arranged on the front surface of the pressing plate, one end of the top of the liquid overflow groove extends to the extension edge of the liquid accumulation groove, and the other end of the liquid overflow groove extends to the back surface of the pressing plate used for pressing the scraping plate.

2. An improved PI coater doctor blade structure as claimed in claim 1, wherein: The pressing plate and the supporting plate are fixed through bolts, the scraping plate and the pressing plate are detachably arranged between the pressing plate and the supporting plate, and the pressing plate is arranged between the scraping plate and the supporting plate.

3. The improved PI coater doctor blade structure of claim 1, wherein: The groove arranged on the back surface of the pressing plate matches the stepped groove arranged on the front surface of the supporting plate, the stepped groove arranged on the front surface of the supporting plate matches the scraping tool supporting frame, and stable support is provided for the scraping tool.

4. The improved PI coater doctor blade structure of claim 1, wherein: Adjustable side baffles are arranged on the two side surfaces of the pressing plate.

5. The improved PI coater doctor blade structure of claim 1, wherein: A handle is fixedly arranged on the front surface of the supporting plate.

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