A self-coupling L-shaped slit double-plate coating scraper, system and method

Abstract

The present application discloses a self-coupled L-shaped slit double-plate coating scraper, system and method, which relates to the field of coating technology. The self-coupled L-shaped slit double-plate coating scraper includes a blade head, a back plate and a transmission substrate. The blade head has a side surface and a bottom surface, and a transition section is formed between the side surface and the bottom surface. A longitudinal slit for injecting slurry is formed between the back plate and the bottom of the blade head; a transverse slit with a length of not less than 0.5 cm is formed between the transmission substrate and the bottom surface of the blade head, and the longitudinal slit is connected with the transverse slit to form an L-shaped slit, and a coupling connection is formed in the transition section; after the slurry enters the coupling connection, it is driven by the base film arranged on the transmission substrate, moves along the longitudinal slit and is directly filmed under shear stress. The self-coupled L-shaped slit double-plate coating scraper has a compact structure and is precisely adjustable, so that the slurry in the transverse slit will be more compact and uniform, reducing coating defects and improving film quality.

Description

Technical Field

[0001] The present application relates to the field of coating technology, and in particular to a self-coupling L-shaped slit double-plate coating scraper, system and method. Background Art

[0002] In the field of coating technology, the mainstream technologies are mainly rotary coating, vacuum evaporation, magnetron sputtering and other technologies. In the commercial large-scale coating technology, screen printing, roll-to-roll coating, inkjet printing and vacuum evaporation technology occupy a major position. Slit coating technology is a type of roll-to-roll coating technology. It can prepare high-quality functional films in a non-contact printing manner. It has the advantages of being suitable for large-scale production, high uniformity, and a wide range of thickness adjustment. It is especially widely used in thin-film solar cells, lithium-ion batteries, FCCL (Flexible Copper Clad Laminate), optical films, graphene films, ceramic films, high-end tapes and various functional film industries. The slit coating blade structure mainly includes: a moving conveying substrate 15, a slit cavity, and a pumping system.

[0003] At present, the research and design of the slit coating blade structure focuses on: internal cavity structure and die outlet structure. Among them, the cavity storage tank and liquid channel determine the uniformity of slurry flow; the size and structure of the slit die outlet determine the coating width; the discharge speed, slurry viscosity and substrate surface properties determine the coating film thickness.

[0004] However, the existing slit coating tools have extremely high requirements on the precise design of the slit structure, structural flatness, and blade parallelism. Minor structural errors will directly destroy the uniformity and integrity of the coating. In addition, the slight vibration and deformation errors of the slit coating blade during operation will seriously affect the uniformity of the slurry coating, and thus affect the coating quality. Summary of the invention

[0005] In order to overcome the shortcomings of the existing slit coating technology, the present application provides a self-coupling L-shaped slit double-plate coating scraper, system and method. The self-coupling L-shaped slit double-plate coating scraper has a compact structure and is precisely adjustable.

[0006] Specifically, the first object of the embodiment of the present application is to provide a self-coupling L-shaped slit double-plate coating blade, comprising:

[0007] The cutter head comprises a slit plate, a side surface and a bottom surface, a transition section is formed between the side surface and the bottom surface, and the slit plate is arranged at the bottom of the cutter head;

[0008] A back plate; a longitudinal slit for injecting slurry is formed between the back plate and the bottom of the cutter head;

[0009] and a conveying substrate, a transverse slit with a length of not less than 0.5 cm is formed between the conveying substrate and the slit plate, the longitudinal slit is connected with the transverse slit to form an L-shaped slit, and a coupling connection is formed in the transition section; after the slurry enters the coupling connection from the longitudinal slit, it is driven by the base film arranged on the conveying substrate, moves along the longitudinal slit and is directly subjected to shear stress to form a film.

[0010] In the above scheme, the longitudinal slit is connected with the transverse slit to form an L-shaped slit through a unique L-shaped slit design, which enables the slurry to be more evenly distributed on the conveying substrate. The L-shaped slit helps to reduce the accumulation of slurry on the scraper head, thereby avoiding defects that may occur during the coating process, such as streaks, bubbles, etc. After the slurry enters the coupling connection from the longitudinal slit, it is driven by the base film on the conveying substrate and moves along the longitudinal slit. This design ensures that the slurry can be quickly and evenly distributed on the conveying substrate, thereby improving the coating efficiency.

[0011] The length of the transverse slit is not less than 0.5 cm, which helps to accurately control the width and thickness of the coating. By adjusting the size of the longitudinal slit and the transverse slit, the coating effect can be further fine-tuned to meet the needs of different applications. A transition section is formed between the side and bottom surfaces, which helps to reduce the friction and resistance of the scraper during the scraping process. The optimization of the transition section can also improve the durability and stability of the scraper and extend its service life.

[0012] The coating blade is suitable for many different types of slurries, including high-viscosity and low-viscosity slurries. It can also be used for coating a variety of materials, such as paper, cloth, leather, aluminum foil, plastic film, etc.

[0013] As a further improvement of the present application, the angle between the back plate and the transmission base is α , the transition section is chamfered, and the radius of the chamfer is β ; The radius of the chamfer is r The height of the transverse slit is h The length of the transverse slit is l ; Scrape coating slurry viscosity η , the departure angle of the blade γ , and satisfy:

[0014] 15< α <135°;

[0015] 0°< β <135°;

[0016] 0≤ r ≤ 20 cm;

[0017] 3μm≤ h ≤5 mm;

[0018] 1 cm≤ l ≤15 cm;

[0019] 3 mPa·s≤ η ≤10 10 mPa·s;

[0020] γ ≤90°.

[0021] In the above scheme, the angle between the back plate and the transmission substrate is α (15°< α <135°) provides a wide range of installation angles for coating scrapers, which helps to adapt to different coating process requirements. β The radian design of (0°<β<135°) not only optimizes the structure of the coating scraper, but also reduces the friction between the scraper and the conveying substrate, thereby extending the service life of the scraper.

[0022] Chamfer radius r (0≤ r The precise control of the lateral slit height (≤20 cm) enables the scraper to maintain a stable scraping effect during the scraping process. h (3μm≤ h ≤5 mm) and length l (1 cm ≤ l The precise design of the coating width (≤15 cm) helps control the flow rate and coating width of the paint, thus ensuring the uniformity and consistency of the coating film.

[0023] The viscosity of the coating slurry η (3 mPa·s≤ η ≤10 10 mPa·s) range, making the coating blade suitable for many different types of coatings, including high-viscosity and low-viscosity coatings.

[0024] Cutting head departure angle γ ( γ The 90° (≤90°) design helps reduce paint accumulation on the scraper head, thus avoiding coating defects.

[0025] Due to the precise design and control of the above parameters, the coating blade can provide high-quality coating effects, with uniform and consistent coating films and few coating defects. The design of the self-coupling L-shaped slit double-plate coating blade enables it to be suitable for a variety of coating processes and equipment, including but not limited to the coating processing of materials such as paper, cloth, leather, aluminum foil, and plastic film. Through its precise structural design and parameter control, it provides high-quality coating effects and has a wide range of application scenarios and adaptability. However, it should be noted that in actual applications, the scraper needs to be further adjusted and optimized according to the specific coating process and equipment requirements.

[0026] As a further improvement of the present application, the longitudinal slits are parallel slits or V-shaped slits; the transverse slits are parallel slits formed by two parallel flat plates or curved slits formed by hyperbolic plates;

[0027] As a further improvement of the present application, the V-shaped slit is a buffer-type slit that is wide at the top and narrow at the bottom; the hyperbolic panels have the same shape, the V-shaped slit is wide at the top and narrow at the bottom, sealed on all sides, and has an opening at the top and a slit at the bottom, and the overall structure is an inverted triangular prism;

[0028] As a further improvement of the present application, the transverse slit is a single-sided assembled coupling base film slit, and the slit plate of the single-sided assembled coupling base film slit is a high flatness and low roughness plate.

[0029] In the above scheme, parallel slits: provide a stable slurry flow path, which helps to achieve a uniform coating effect. V-shaped slits: The design of wide at the top and narrow at the bottom acts as a buffer, which can slow down the flow rate of the slurry and make the slurry more evenly distributed on the conveying substrate, especially in the application of high-viscosity slurry.

[0030] Furthermore, the parallel slits formed by the two parallel plates provide precise coating width control and are suitable for applications requiring high-precision coating. The curved slits formed by the hyperbolic plates may help improve the fluid dynamics during the coating process, such as reducing turbulence and eddies, thereby improving the uniformity and stability of the coating. The special structure of the V-shaped slit, which is wide at the top and narrow at the bottom and sealed on all sides, ensures that the slurry flows more orderly in the slit, avoiding leakage and waste of the slurry. The design of the top opening and the bottom slit allows the slurry to smoothly enter the slit and form a uniform coating layer at the bottom. The overall design of the inverted triangular prism structure not only enhances the structural strength of the slit, but also optimizes the flow path of the slurry and improves the coating efficiency.

[0031] Symmetry of the hyperbolic panels: Hyperbolic panels of the same shape can ensure a more uniform flow of the slurry in the slit, avoiding the problem of uneven coating caused by inconsistent panel shapes.

[0032] Furthermore, a slit plate with high flatness can ensure that the slurry flows more smoothly in the slit, avoiding the problem of uneven coating caused by the unevenness of the slit plate. A slit plate with high flatness can reduce defects such as stripes and bubbles that may occur during the coating process, thereby improving the coating quality. A slit plate with low roughness can reduce the frictional resistance between the slurry and the slurry, allowing the slurry to flow through the slit more smoothly, avoiding the problem of slurry accumulation and blockage caused by excessive frictional resistance. A slit plate with low roughness can reduce the wear between the slurry and the slurry, thereby extending the service life of the scraper and reducing maintenance costs.

[0033] As a further improvement of the present application, the slit plate has a height adjustment structure and / or a width adjustment structure, and the conveying substrate is coupled with a moving base film system.

[0034] As a further improvement of the present application, the cutter head includes a side plate, a lower plate, an upper plate and a linear bearing, the lower plate is fixed between the bottoms of two opposite side plates; the two side plates are jointly fixed to the bottom of the upper plate; the cutter head is connected to the back plate through the linear bearings on both ends of the upper plate.

[0035] As a further improvement of the present application, the back plate includes a transmission base, a notch adjustment member, a slot plate, a fixed optical axis, a micrometer and a pressure spring;

[0036] The linear bearing is connected to the notch adjustment member of the back plate;

[0037] The notch adjustment member is fixed on the transmission base, and the lateral position is adjusted through the hole on the transmission base. The slot plate and the fixed optical axis are fixed on the notch adjustment member. The top end of the fixed optical axis is connected to a micrometer head for controlling the height of the upper plate. The pressure spring is installed on the fixed optical axis to provide resistance for fixing the upper plate.

[0038] The above scheme not only improves the coating accuracy and uniformity of the coating scraper, but also enhances its structural stability and durability. By optimizing the design of the blade head and the back plate, the coating scraper can maintain smooth and precise movement during the coating process, thereby improving the coating efficiency and quality. The self-coupling L-shaped slit double-plate coating scraper improves the coating accuracy, uniformity and structural stability by further optimizing the design of the blade head and the back plate. These advantages make the coating scraper more competitive and valuable in the field of coating processing, and can meet a wider range of application needs.

[0039] As a further improvement of the present application, the number of the blade heads is n, n ≥ 2, the n blade heads are arranged side by side, and the bottoms are on the same plane, the n blade heads are coupled and connected in sequence with the n transverse slits formed by the conveying substrate, wherein the first blade head forms a first longitudinal slit with the back plate; and the nth blade head forms an nth longitudinal slit with the side wall of the n-1th blade head, forming a total of n longitudinal slits;

[0040] As a further improvement of the present application, the same or different types of slurries are added into the n longitudinal slits.

[0041] As a further improvement of the present application, a curing unit is further provided at the bottom of the cutter head, and the curing unit acts on the slurry on the surface of the base film so that the slurry is cured to form a semi-wet film state.

[0042] The second purpose of the present application is to provide a system that uses the self-coupled L-shaped slit double-plate coating scraper to perform slurry coating; the system is any one of a slit coater, a slit roll-to-roll device, a printing device, and a device with slit coating.

[0043] The third object of the present application is to provide a coating method based on the self-coupling L-shaped slit double-plate coating blade; the coating method comprises:

[0044] injecting the slurry into the longitudinal slit;

[0045] After the slurry enters the coupling connection, it is driven by the base film arranged on the transmission substrate and moves along the longitudinal slit;

[0046] During the movement, the slurry is directly filmed on the base film under the shear stress.

[0047] Compared with the prior art, the beneficial effects of this application are:

[0048] In the present application, the longitudinal slit and the transverse slit are connected by an arc chamfer. When the slurry flows to the transverse slit, it is affected by the shear force. The slurry will be more compact and uniform in the transverse slit, reducing coating defects and improving film quality. The longitudinal slit is sealed by an adjustable notch, and the slit adjustment and sealing functions are achieved at the same time with low processing precision. The L-shaped slit coating slit plate precision plane forms a transverse slit with the conveyed base film. The length of the transverse slit is the key to determining the coating effect, especially the requirement that the length of the transverse slit between the conveying substrate and the bottom surface of the blade head is not less than 0.5 cm. The film obtained by coating has excellent performance and the coating quality meets the requirements. The present application couples the slit with the conveying base film to optimize the difficulty of adjusting the slit and the conveying base film, and effectively increases the stability of the slit coating discharge. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 It is a schematic diagram of the technical principle of this application;

[0050] Figure 2 This is an embodiment of a flat coating scraper and a schematic diagram of its cross-sectional flow channel based on the present application, wherein (a) is a stereoscopic diagram and (b) is a cross-sectional diagram;

[0051] Figure 3 This is a schematic diagram of the curved surface coating scraper structure based on the present application;

[0052] Figure 4 This is a schematic diagram of the L-shaped slit pretreatment coating structure based on the present application;

[0053] Figure 5 It is a schematic diagram of a double-layer L-slit coating structure based on this application;

[0054] Figure 6 This is a comparison chart of the feasibility and effect of scraping;

[0055] Figure 7 Based on Figure 2The coating blade structure shown, the microstructure diagram of the coating effect of the surfactant solution;

[0056] Figure 8 based on Figure 3 The curved surface coating blade structure shown, the coating microstructure of the surfactant solution;

[0057] Fig. 9 Based on Figure 4 Micrograph of the coating effect of the pre-treated structured polymer solution shown;

[0058] Fig.10 Based on Figure 5 The double-layer continuously coated blade structure shown is a polarized light micrograph of a coating layer coated with a polyarylether polymer solution slurry;

[0059] Fig.11 Micrograph of coating applied by polymer slurry;

[0060] Fig.12 Micrograph of a coating applied with a surfactant liquid crystal slurry.

[0061] Among them, 11, the blade head; 12, the back plate; 15, the conveying base; 116, the transition section; 131, the longitudinal slit; 132, the transverse slit; 14, the base film; 16, the support; 111, the lower plate; 112, the side plate; 113, the longitudinal plate; 114, the upper plate; 115, the linear bearing; 121, the base plate; 122, the slot adjustment member; 123, the slot plate; 124, the fixed optical axis; 125, the micrometer head 125; 126, the pressure spring; 152, the roller base; 17, the curing unit; 51, the first longitudinal slit; 52, the transition transverse slit; 53, the second longitudinal slit; 54, the transverse total slit; 55, the pre-slit. DETAILED DESCRIPTION

[0062] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0063] In this application, the term "and / or" describes the association relationship of associated objects, indicating that there may be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. A and B can be singular or plural. The character " / " generally indicates that the associated objects are in an "or" relationship.

[0064] In this application, "at least one" means one or more, and "plurality" means two or more. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, "at least one of a, b, or c", or "at least one of a, b, and c" can all mean: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, and c can be single or multiple.

[0065] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution, some or all of the steps can be executed in parallel or sequentially, and the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0066] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "an", "the" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0067] The weight of the relevant components mentioned in the embodiment description of the present application can not only refer to the specific content of each component, but also indicate the proportional relationship between the weights of the components. Therefore, as long as the content of the relevant components is proportionally enlarged or reduced according to the embodiment description of the present application, it is within the scope disclosed in the embodiment description of the present application. Specifically, the mass in the embodiment description of the present application can be a mass unit known in the chemical industry such as µg, mg, g, kg, etc.

[0068] The terms "first" and "second" are used only for descriptive purposes to distinguish objects such as substances from each other, and should not be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. For example, without departing from the scope of the embodiments of the present application, the first XX may also be referred to as the second XX, and similarly, the second XX may also be referred to as the first XX. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0069] This application provides a slit coating technology solution for a self-coupled L-shaped slit channel. Figure 1As shown in the figure, the first specific purpose is to provide a self-coupled L-shaped slit double-plate coating scraper, including: a blade head 11, a back plate 12 and a conveying substrate 15; the blade head 11 has a side surface and a bottom surface, and a transition section 116 is formed between the side surface and the bottom surface; a longitudinal slit 131 for injecting slurry is formed between the back plate 12 and the bottom of the blade head 11; a transverse slit 132 with a length of not less than 0.5 cm is formed between the conveying substrate 15 and the bottom surface of the blade head 11, and the longitudinal slit 131 is connected with the transverse slit 132 to form an L-shaped slit, and a coupling connection is formed in the transition section 116; after the slurry enters the coupling connection, it is driven by the base film 14 arranged on the conveying substrate 15, moves along the longitudinal slit 131 and is directly filmed under shear stress.

[0070] In the above scheme, the cutter head 11 has a side surface and a bottom surface, and a transition section 116 is formed between the side surface and the bottom surface. A longitudinal slit 131 for injecting slurry is formed between the back plate 12 and the bottom of the cutter head 11. A transverse slit 132 with a length of not less than 0.5 cm is formed between the conveying base 15 and the bottom surface of the cutter head 11. The longitudinal slit 131 is connected with the transverse slit 132 to form an L-shaped slit, and a coupling connection is formed at the transition section 116.

[0071] The conveying substrate 15 is arranged on a support 16 , and the support 16 is a smooth and hard support.

[0072] During the coating process, the slurry is injected from the longitudinal slit 131 between the back plate 12 and the bottom of the blade head 11. After the slurry enters the coupling connection, it is driven by the base film 14 on the transmission substrate 15 and moves along the longitudinal slit 131. During the movement, the slurry is subjected to shear stress and forms a thin film directly on the base film 14. The formed thin film moves with the base film 14, and finally the coating process is completed.

[0073] Therefore, the design of the L-shaped slit causes the slurry to be squeezed and restricted multiple times during the flow process, thereby improving the uniformity and accuracy of the coating. By adjusting the size and shape of the slit, the thickness and uniformity of the coating layer can be accurately controlled. This technical solution can adapt to slurries with different viscosities and solid contents. The length of the transverse slit 132 is not less than 0.5 cm, which provides sufficient flow space for the slurry and makes the coating process more stable. The connection design between the longitudinal slit 131 and the transverse slit 132 allows the slurry to be quickly and evenly coated on the base film 14. The driving effect of the base film 14 makes the coating process more continuous and efficient. Accurate coating control reduces the waste of slurry. Waste generated during the coating process can be easily collected and processed. The design of the slit makes the cleaning process easier and more thorough.

[0074] In the above scheme, the cutter head 11 undergoes structural self-coupling when used in conjunction with a smooth hard support, and the first surface and the second surface form a self-coupling slit structure; the longitudinal slit 131 of the slurry storage tank and the slit between the first surface and the second surface form an L-shaped slit; a double-plate structure is formed by the hard first surface and the hard second surface; the coating base moves unidirectionally close to the second surface. Figure 1 In the figure, all black areas refer to rigid structural parts, and light-colored areas refer to the paint slurry to be scraped.

[0075] Specifically, the self-coupled L-shaped slit double-plate coating scraper of the present application includes a longitudinal slit 131 and a transverse slit 132. The longitudinal slit 131 is wide at the top and narrow at the bottom, and is sealed all around to leave a top opening and a bottom slit, forming an inverted triangular prism shape; the transverse slit 132 structure is composed of a slit plate 110 with high flatness and low surface roughness and a conveying substrate 15. The transverse slit 132 is connected to the longitudinal slit 131 by the slit plate 110, and an arc chamfer is performed at the connection; the transverse slit 132 is connected to the bottom of the longitudinal slit 131 to form an L-shaped slit coating.

[0076] In the above scheme, the design of the self-coupling L-shaped slit double-plate coating scraper combines the characteristics of the longitudinal slit 131 and the transverse slit 132. Its working principle is mainly based on the principle of slit coating technology. The longitudinal slit 131 is wide at the top and narrow at the bottom, sealed on all sides, leaving only the top opening and the bottom slit, and is in the shape of an inverted triangular prism. This design allows the coating liquid to flow out evenly along the channel of the slit under pressure. Under a certain pressure, the coating liquid enters the longitudinal slit 131 through the top opening and maintains a certain flow rate in the slit. Due to the shape and size design of the slit, the coating liquid will be squeezed and restricted to a certain extent during the outflow process, thereby ensuring that the coating liquid can be evenly and stably coated on the substrate. The transverse slit 132 is composed of a slit plate 110 with high flatness and low surface roughness and a conveying substrate 15. The slit plate 110 is connected to the longitudinal slit 131, and a circular arc chamfer is performed at the connection to reduce resistance during the coating process. The transverse slit 132 is connected to the bottom of the longitudinal slit 131 to form an L-shaped slit coating structure. During the coating process, after the coating liquid flows out from the longitudinal slit 131, it continues to be coated on the substrate along the channel of the transverse slit 132. Due to the design of the transverse slit 132, the coating liquid will be further restricted and uniformed during the outflow process, thereby ensuring that the coating layer has higher uniformity and precision.

[0077] Furthermore, the coating liquid enters the longitudinal slit 131 through the top opening under pressure and maintains a certain flow rate and speed in the slit. Then, the coating liquid flows out along the longitudinal slit 131 and connects with the transverse slit 132. In the transverse slit 132, the coating liquid is further restricted and homogenized, and finally coated on the conveying substrate 15. Due to the special design of the longitudinal slit 131 and the transverse slit 132, the coating liquid is squeezed and restricted multiple times during the outflow process, thereby ensuring that the coating layer has higher uniformity and precision. In addition, the design of the L-shaped structure can also reduce bubbles and impurities during the coating process, further improving the coating quality. The design of the self-coupling L-shaped slit double-plate coating scraper enables it to adapt to coating liquids with different viscosities and solid contents. By adjusting the size and shape of the slit, precise control of the thickness and uniformity of the coating layer can be achieved.

[0078] The parallelism of the slit plate 110 of the transverse slit 132 with the conveying substrate 15 can be adjusted by four adjustable bolts; the slit width of the transverse slit 132 can be adjusted by a micrometer head 125. The parallelism of the transverse slit 132 can be accurately adjusted by the conditions of the adjustable bolts, reducing the coating uniformity difference caused by the slit parallelism.

[0079] In the above scheme, the shape of the longitudinal slit 131 of the present application adopts a design of being wide at the top and narrow at the bottom, which is conducive to the uniform distribution and flow of the paint, and avoids the accumulation of the paint in the slit or the formation of an uneven coating. The top opening and the bottom slit are sealed all around to ensure that the paint flows out only through a predetermined path, thereby improving the accuracy and consistency of the coating. The slit plate 110 with high flatness and low surface roughness helps to reduce the resistance of the paint during the flow process and improve the smoothness of the coating. The connection between the slit plate 110 and the longitudinal slit 131 is chamfered with an arc, which can reduce the accumulation and friction of the paint at the turning point and further improve the coating effect. The parallelism of the transverse slit 132 plate and the conveying base 15 is adjusted by four adjustable bolts, which can ensure the uniform distribution of the paint in the transverse slit 132 during the coating process and avoid uneven coating thickness. Among them, the high-precision adjustment function of the micrometer head 125 can be selected, allowing the user to accurately adjust the width of the transverse slit 132 as needed, thereby controlling the thickness and uniformity of the coating.

[0080] Figure 1 In the figure, the angle between the back plate 12 and the transfer substrate 15 is α , the transition section 116 is chamfered, and the arc of the chamfer is β ; The radius of the chamfer is r , the height of the transverse slit 132 is h, and the length of the transverse slit 132 is l ; Scrape coating slurry viscosity η , the departure angle of the cutter head 11 γ , when the conditions are met, a better coating effect can be obtained. The specific parameters are:

[0081] 15< α <135°;0°< β <135°;0≤ r ≤ 20cm; 3μm≤ h ≤5 mm; 1 cm≤ l ≤15 cm; 3mPa·s≤ η ≤10 10 mPa·s; γ ≤90°.

[0082] In particular, the length of the transverse slit 132 is l, which satisfies in particular that the length is not less than 0.5 cm, and further satisfies that 1 cm≤ l ≤15 cm, automatic film formation can be achieved, and the thickness and uniformity of the coating can be effectively controlled. It is also a key parameter of the self-coupling L-shaped slit double-plate coating scraper of this application.

[0083] Figure 1 In the figure, v1 is the entry speed of the slurry, and its direction is the direction of the arrow; v2 is the conveying speed of the conveying substrate, and its direction is the direction of the arrow.

[0084] The applicant's research found that the length of the transverse slit 132 is set to 1, especially the length is not less than 0.5 cm. This specific size range has significant advantages for realizing the automatic film forming process. Within this length range, the transverse slit 132 can not only effectively promote the uniform distribution and stable flow of the fluid, but also ensure the formation of a continuous and high-quality film during the film forming process. This discovery is based on a deep understanding of the principles of fluid dynamics and the result of experimental verification.

[0085] In particular, the length is not less than 0.5 cm. Compared with the traditional scraping type scraper, the traditional scraper usually does not have a transverse slit 132, or the transverse slit 132 depends on the thickness of the blade (all less than 0.5 cm), and the surface of the transverse slit 132 is not finely ground, and the roughness of the transverse slit 132 is not controlled. Therefore, the scraping quality is poor, and the quality of liquid film scraping depends on the front accuracy of the scraper blade. In addition, the traditional scraper does not have a transition section 116 arc, resulting in the slurry supply to the coating layer during the scraping process. The use of the transition section 116 arc can improve the smoothness of the slurry feeding to the liquid film surface.

[0086] Compared with the traditional slit coating scraper head, the coating principle of the traditional slit coating scraper head is similar to that of the dispensing machine. The coated slurry is only extruded without scraping. The thickness of the liquid film depends on the injection rate and the movement rate of the blade head. The blade head itself does not "scrape" the liquid film. Even if a few coating scraper heads have a certain thickness, this thickness is usually less than 0.5 cm and does not participate in scraping.

[0087] Specifically, when the length of the transverse slit 132 is l When the above conditions are met, the flow rate and flow rate of the fluid can be precisely controlled when passing through the slit, avoiding inconsistent coating thickness or coating defects caused by uneven flow rate. This is because the length of the slit directly affects the flow resistance and pressure distribution of the fluid therein, and the continuous length of the transverse slit 132 ensures a certain scraping force, thereby affecting the deposition effect and uniformity of the coating.

[0088] In addition, by adjusting the length of the transverse slit 132 l , the applicant has also found that effective control of coating thickness can be achieved. Longer slits may allow more fluid to pass through, and the length requirement can subject the fluid to shear stress for a longer time, thereby forming a thicker and more uniform coating under the same conditions; while shorter slits limit the amount of fluid passing through, forming a thinner coating. Therefore, by accurately adjusting the slit length, the thickness of the coating can be customized according to actual needs. Therefore, the length of the transverse slit 132 is not less than 0.5 cm, which not only realizes the high efficiency and stability of automatic film formation, but also effectively controls the thickness and uniformity of the coating. This discovery also enables the slit coating technology of the self-coupled L-shaped slit channel of the present application to solve the quality problems caused by manual coating.

[0089] In the above solution, the angle between the back plate 12 and the transmission base 15 is α The size of the angle affects the flow pattern and pressure distribution of the coating at the turning point. The appropriate angle helps the coating to transition smoothly at the turning point and avoid coating defects. β and radius r The design can reduce the friction and accumulation of paint at the turning point, and improve the smoothness and uniformity of coating. r The size of the transverse slit 132 also affects the flow speed and pressure distribution of the coating, and needs to be adjusted according to the viscosity of the coating and the coating speed. h and length l Directly affects the thickness and coating speed of the coating. A thicker slit can provide a larger coating flow, but may result in uneven coating thickness; a longer slit can extend the flow path of the coating, but may increase the coating time. Scrape coating slurry viscosity η It is one of the key factors affecting the coating effect. Appropriate viscosity can ensure that the coating flows evenly in the narrow gap to form a smooth and uniform coating. Too high viscosity may cause the coating to flow difficultly and form an uneven coating; too low viscosity may cause the coating to flow too quickly and fail to form a sufficient coating thickness.

[0090] In addition, the departure angle of the cutter head 11 of the present application γ≤90°. This is one of the key points different from the traditional slit coating scraper head. Only when the angle is less than 90° can it be ensured that the liquid film after scraping will not be "lifted up" by the departing scraper head 11, resulting in the liquid film being destroyed.

[0091] Therefore, the self-coupling L-shaped slit double-plate coating blade of the embodiment of the present application can significantly improve the accuracy, consistency and smoothness of coating through the designed structure and parameter adjustment. These parameters play a vital role in the coating process and need to be finely adjusted according to the specific coating properties and coating requirements.

[0092] Furthermore, the self-coupled L-shaped slit double-plate coating blade of the present application includes a longitudinal slit 131 and a transverse slit 132, and the longitudinal slit 131 and the transverse slit 132 are coupled and connected, and the shear stress generated by the large turning transition between the longitudinal slit 131 and the transverse slit 132 affects the slurry state;

[0093] More preferably, the longitudinal slits 131 are parallel slits or V-shaped slits. The transverse slits 132 are standard slits formed by two parallel plates; the V-shaped slits are buffer-type slits that are wide at the top and narrow at the bottom.

[0094] By studying the influence on the slurry state, including at least one of the micro-orientation of the material, the porosity of the slurry, and the fluid pressure, the applicant found that: when the structure of the transverse slit 132 is a single-sided assembled coupled base film slit, the single-sided assembled coupled base film slit, the slit plate 110 is a high flatness and low roughness plate, and the lower contact surface is coupled to a roll-to-roll base film or other moving base film system; the slurry of the single-sided assembled coupled base film slit is driven by the base film 14, and after passing through the transverse slit 132, it can directly form a film without transfer.

[0095] The slit plate 110 with high flatness and low roughness provided in the present application has adjustable height and parallelism to meet different coating requirements and process parameters.

[0096] The pretreatment process of the present application also forms a slit plate 110 with a pretreatment effect by applying a composite disturbance field. The specific device can be a curing unit 17. During the specific operation, a mounting position is provided for mounting the curing unit 17. The curing unit 17 can be a heat source, an electrode, a magnetic pole or a light source. The external power supply can be connected through a wire, so that the external field is applied in situ and synchronously at the scraper position. The composite disturbance field includes at least one of an additional force field, a thermal field, a light field, an alternating / direct current / pulsed electric field, and a magnetic field.

[0097] During the manufacturing process of the slit plate 110, a composite disturbance field is applied to improve its performance so that it can match the composite disturbance field effect of the curing unit 17. The composite disturbance field for manufacturing the slit plate 110 includes at least one of an additional force field, a thermal field, a light field, an alternating / direct current / pulsed electric field, and a magnetic field. These disturbance fields can regulate the microstructure and surface properties of the slit plate 110, thereby improving its flatness and reducing its roughness. By applying the composite disturbance field, a pre-treated composite slit plate 110 is formed. The pre-treatment process can optimize the surface morphology and performance of the slit plate 110, making it more suitable for coating applications.

[0098] The special L-shaped slit of this technology can improve the uniformity of slurry flow. The high-plane and high-parallelism flat surface can evenly spread the slurry applied by shear friction, which can greatly reduce the scraper's dependence on the accuracy of the slit structure, simplify the coating process, and improve the coating quality. The high-parallelism and high-flatness flat plate can also adjust the width of the discharge port according to specific working conditions, effectively regulating the coating quality.

[0099] The specific implementation methods of the present application are further described in detail below in conjunction with the drawings and examples. The following examples are used to illustrate the present application but are not used to limit the scope of the present application.

[0100] Embodiment 1:

[0101] See attached Figure 2 As shown, this embodiment provides a Figure 1 The specific structure of the self-coupling L-shaped slit double-plate coating scraper includes: a blade head 11 and a back plate 12, the blade head 11 includes a lower plate 111, a side plate 112, a longitudinal plate 113, and a linear bearing 115, the lower plate 111 is fixed between the bottoms of two opposite side plates 112; the longitudinal plate 113 is connected to the side surfaces of the two side plates 112 and are jointly fixed to the bottom of the upper plate 114; the blade head 11 is connected to the back plate 12 through the linear bearings 115 on both ends of the upper plate 114.

[0102] Specifically, a lower plate 111 is provided at the lower part of the cutter head 11 and is fixed to the side plate 112 by bolts. The longitudinal plate 113 and the side plate 112 are fixed to the longitudinal plate 113. The cutter head 11 is connected to the notch adjustment member 122 of the back plate 12 through the linear bearings 115 at both ends of the longitudinal plate 113.

[0103] As a specific solution, the back plate 12 includes a base plate 121, a notch adjustment member 122, a slot plate 123, a fixed optical axis 124, a micrometer head 125 and a pressure spring 126; the linear bearing 115 is connected to the notch adjustment member 122 of the back plate 12. The notch adjustment member 122 of the back plate 12 is fixed to the base plate 121 and can adjust the lateral position through the hole (shown as an oblong hole) on the base plate 121, the slot plate 123 and the fixed optical axis 124 are fixed to the notch adjustment member 122, the top end of the fixed optical axis 124 is connected to the micrometer head 125 to control the height of the upper plate 114, and the pressure spring 126 on the fixed optical axis 124 provides resistance for fixing the upper plate 114.

[0104] Furthermore, after the cutter head 11 is adjusted to a suitable height using the micrometer head 125 , it is clamped and sealed by the notch adjustment member 122 to form an L-shaped slit channel in which the longitudinal slit 131 and the transverse slit 132 are coupled.

[0105] As an example, the base film 14 passes through the through groove at the bottom of the substrate 121, enters the bottom of the longitudinal slit 131, and then passes through the transverse slit 132. The slurry is injected from above the longitudinal slit 131 and flows through the longitudinal slit 131 to the transverse slit 132. The through groove of the substrate 121 can be continuously transported by the base film 14, and the base film 14 drives the slurry at the bottom of the longitudinal slit 131 into the transverse slit 132. This arrangement can make the slurry more compact after entering the transverse slit 132 under shear stress.

[0106] Then, the slurry passes through the transverse slit 132 formed by the base film 14 and the lower plate 111 to form a film. The traditional parameters of the slit blade 11, such as the slurry flow rate, the base film 14 movement speed, the slit width, the die opening, the distance between the die and the base film 14, and the angle, are optimized to achieve high-precision slit coating with two simple parameters: the base film 14 speed and the slit height. The length of the transverse slit 132 in this embodiment is l , satisfying 1 cm ≤ l ≤15 cm. The specific setting is 10 cm.

[0107] Furthermore, the substrate 121 can be installed at an angle so that the longitudinal slit 131 is a V-shaped groove, which provides a buffer angle when injecting material and is not easy to generate bubbles. It also increases the force on the slurry at the bottom of the slit, making it easier to enter the transverse slit 132 along with the base film 14.

[0108] The lower plate 111 of this embodiment is the above-mentioned slit plate 110 .

[0109] Embodiment 2:

[0110] The L-shaped slit scraper transverse slit 132 can be provided with slit plates 110 of different shapes according to different working conditions, such as Figure 3The schematic diagram of the curved surface coating application of an embodiment of the present application is shown. The slit plate 110 is set with a curved surface that can be fitted with a roller base 152 to form a curved transverse slit 132, and the longitudinal slit 131 is coupled to form an L-shaped slit. The curved transverse slit 132 can achieve controllable slit width by replacing slit plates 110 with different radii. The slurry is injected from the longitudinal slit 131 and flows into the bottom to contact the roller base 152. The rotation of the roller drives the slurry at the bottom of the longitudinal slit 131 to enter the curved transverse slit 132. This setting also achieves the effect of making the slurry more compact after entering the curved transverse slit 132. At the same time, it moves with the roller base 152 in a curved state in the curved transverse slit 132, and a curved coating wet film that fits well with the roller base 152 can be directly formed at the outlet.

[0111] As an optional solution, a curing unit 17 is further provided at the bottom of the slit plate 110, and the curing unit 17 is used to act on the slurry on the surface of the base film 14 so that the slurry is cured to form a semi-wet film state.

[0112] Embodiment 3:

[0113] This application can be expanded to pre-treatment L-type slit coating technology according to the slurry wet film processing requirements, such as Figure 4 The schematic diagram of the L-shaped slit pretreatment coating technology of the embodiment of the present application is shown, including a longitudinal slit 131 and a transverse slit 132, and the longitudinal slit 131 and the transverse slit 132 are coupled and connected in the manner of embodiment 1. After the slurry is injected into the V-shaped groove, it is uniformly stressed in the manner of embodiment 1 and enters the transverse slit 132 in a compact state. The transverse slit 132 is a multifunctional slit plate 110 obtained by combining the slit plate 110 in embodiment 1 with a curing process, and the combined curing process is one or more of the curing methods such as thermal curing, light curing, magnetic, and ultrasonic. The slurry is pretreated in the transverse slit 132, and after passing through the slit, a pretreated semi-wet film state is formed on the surface of the base film 14, which is convenient for subsequent curing treatment.

[0114] The conventional slit coating pretreatment can easily lead to poor fluidity of the slurry at the outlet, which can cause the base film 14 or the roller to be unable to effectively adhere and take away the material, or the curing degree is too high, resulting in blockage of the slit outlet. The technical advantage of this embodiment is that the transverse slit 132 is a coupled slit, and the slurry is always attached to the base film 14 during the pretreatment process. Changes in physical characteristics such as viscosity during the treatment process will not affect the film output efficiency.

[0115] As an optional solution, there are n blade heads 11, n ≥ 2, and the n blade heads 11 are arranged side by side, and the bottoms are on the same plane. The n blade heads 11 and the n transverse slits 132 formed by the conveying base 15 are coupled and connected in sequence, wherein the first blade head 11 and the back plate 12 form the first longitudinal slit 51; and the nth blade head 11 and the side wall of the n-1th blade head 11 form the nth longitudinal slit 131, forming a total of n longitudinal slits 131; the same or different types of slurry are added to the n longitudinal slits 131. The specific solution is shown in Example 4.

[0116] Embodiment 4:

[0117] This application can be expanded to L-type slit coating technology for multiple working conditions according to slurry requirements, such as Figure 5 As shown, the double-layer L-slit coating of the embodiment of the present application is used as an example for explanation. Of course, the arrangement of more layers can also be extended by this embodiment. Specifically including: a first longitudinal slit 51, a transition transverse slit 52, a second longitudinal slit 53 and a transverse total slit 54. The first longitudinal slit 51 and the transition transverse slit 52 are coupled and connected in the manner of Example 1. The transition transverse slit 52 can be processed with a curing unit 17 according to Example 3 according to the actual slurry working conditions, and pre-treatment is performed to prevent the two slurries from being miscible. The curing unit 17 is used to act on the slurry on the surface of the base film 14 so that the slurry is cured to form a semi-wet film state. The transition transverse slit 52 is connected to the transverse total slit 54, and the bottom of the second longitudinal slit 53 is merged with the transition transverse slit 52 through the pre-slit 55 to the transverse total slit 54. The pre-slit 55 is an L-shaped turning slit with a bottom plate, and its structural function is to prevent the slurry at the bottom of the second longitudinal slit 53 from directly acting vertically on the slurry on the transition transverse slit 52. Under the condition that the slurry at the bottom of the second longitudinal slit 53 is sufficiently stressed, the slurry at the transition transverse slit 52 is not subjected to excessive pressure and thus affects the film-forming effect. The end of the pre-slit 55 is connected to the transition transverse slit 52 at a small angle.

[0118] Two different component slurries are respectively injected into the first longitudinal slit 51 and the second longitudinal slit 53. The first type of slurry enters the transition transverse slit 52 after undergoing compressive stress and shear stress; the second type of slurry is driven by the pretreated or untreated first type of slurry in the transition transverse slit 52 at a small angle into the transverse total slit 54 after undergoing the same compressive stress and shear stress at the pre-slit 55, thus finally forming a tight double-layer membrane structure.

[0119] The second object of the present application is to provide a system, which adopts the above-mentioned self-coupled L-shaped slit double-plate coating scraper; the system is any one of a slit coater, a slit roll-to-roll device, a printing device and a device with slit coating.

[0120] The above self-coupling L-shaped slit double-plate coating blade is applied to various coating equipment for slurry coating, such as slit coaters, slit roll-to-roll equipment, printing equipment, and equipment with slit coating function. These equipment can achieve high-precision and high-efficiency coating operations by integrating the self-coupling L-shaped slit double-plate coating blade.

[0121] As an example, the design of the self-coupled L-shaped slit double-plate coating blade makes the coating process more precise, and can achieve micron-level coating thickness control to meet the needs of high-precision coating. By optimizing the structure and parameters of the coating blade, the coating speed can be increased, the production cycle can be shortened, and the production efficiency can be improved. The system can adapt to different types of slurries and coating substrates to meet diverse coating needs.

[0122] The third object of the present application is to provide a coating method based on the above-mentioned self-coupled L-shaped slit double-plate coating scraper; the coating method comprises:

[0123] injecting the slurry into the longitudinal slit 131;

[0124] After the slurry enters the coupling connection, it is driven by the base film 14 arranged on the conveying base 15 and moves along the longitudinal slit 131;

[0125] During the movement, the slurry is subjected to shear stress and directly forms a film on the base film 14 .

[0126] The third object of the present application is to provide a coating method based on a self-coupled L-shaped slit double-plate coating blade. The method includes injecting slurry into the longitudinal slit 131. After the slurry enters the coupling connection, it is driven by the base film 14 arranged on the transmission substrate 15 and moves along the longitudinal slit 131. During the movement, the slurry is subjected to shear stress and directly forms a film on the base film 14.

[0127] As an example, the method utilizes the structural characteristics of the self-coupled L-shaped slit double-plate coating scraper to achieve high-precision, high-uniformity coating operations and ensure coating quality. The method is simple to operate and easy to master, reducing the skill requirements for operators. By optimizing the coating process, production efficiency can be improved and production cycle can be shortened. The method can adapt to different types of slurries and coating substrates to meet diverse coating needs. The system and coating method provided in this application have the advantages of high precision, high efficiency, strong adaptability, easy maintenance, energy saving and environmental protection, and can meet the needs of high-precision coating in different fields.

[0128] The following embodiments are described based on the above coating method.

[0129] Embodiment 5:

[0130] use Figure 2The feasibility and effect of scraping with the scraper with the structure shown in Table 1 and Figure 6 :

[0131] Table 1 Comparison results of different slurries

[0132]

[0133] Embodiment 6:

[0134] based on Figure 2 The coating method provided by the coating blade structure shown in the figure shows the coating effect of coating a surfactant solution with a viscosity of 10 mPa·s on a substrate. Figure 7 .from Figure 7 A uniform and clear base layer and coating layer can be seen in the figure, proving that the coating is successful and uniform, and proving that the function can be achieved.

[0135] Embodiment 7:

[0136] based on Figure 3 The coating method (curved type) provided by the curved coating blade structure shown is to coat a 10% viscosity coating on the substrate. 5 mPa·s surfactant solution coating effect microstructure diagram, microstructure diagram see Figure 8 .from Figure 8 A uniform and clear base layer and coating layer can be seen in the figure, proving that the coating is successful and uniform, and proving that the function can be achieved.

[0137] Embodiment 8:

[0138] based on Figure 4 The coating method provided by the coating blade structure (plane type) coupled with the pre-treatment structure is to coat the substrate with a viscosity of 10 10 mPa·s polymer solution coating effect microstructure diagram, microstructure diagram see Fig. 9 .from Fig. 9 A uniform and clear base layer and coating can be seen in the figure, proving that the coating is successful and uniform, proving that the function can be achieved.

[0139] Example 9

[0140] based on Figure 5 The coating method provided by the double-layer continuous coating blade 11 structure (plane type) is to first coat the viscosity 10 on the substrate. 10 mPa·s polymer solution, coating viscosity 10 5 mPa·s surfactant coating effect micrograph, microstructure diagram see Fig.10 From the figure, we can see the uniform and clear base layer, pretreatment coating layer, and liquid film coating layer, which proves that the coating is successful and uniform, and proves that this function can be achieved.

[0141] Example 10

[0142] based on Figure 1 The polarized light micrograph of the coating of the blade head 11 coated with the polyarylether polymer solution slurry is shown in the microstructure diagram. Fig.11 .like Fig.11 As shown, after the polarizer and analyzer are rotated 45 degrees at the same time, the polarized light microscopic field of the polymer solution slurry coating changes from full brightness to full darkness, indicating that the polymer molecular segments in the coating can be oriented and arranged under the coating of the blade head 11 structure.

[0143] Embodiment 11

[0144] based on Figure 1 The blade head 11 of the structural principle shown in the figure is coated with a polarized light micrograph of a surfactant liquid crystal slurry. Fig.12 As shown, after the polarizer and analyzer are rotated 45 degrees at the same time, the polarized light microscopic field of the liquid crystal slurry coating changes from full brightness to full darkness, indicating that the liquid crystal domains in the coating can be oriented and arranged under the coating of the blade head 11 structure of the present application.

[0145] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A self-coupling L-shaped slit double-plate coating blade, characterized in that: include: A cutter head, the cutter head having a slit plate, a side surface and a bottom surface, a transition section is formed between the side surface and the bottom surface, and the slit plate is arranged at the bottom of the cutter head; A back plate, wherein a longitudinal slit for injecting slurry is formed between the back plate and the bottom of the cutter head; and a conveying substrate, wherein a transverse slit having a length of not less than 0.5 cm is formed between the conveying substrate and the slit plate, the longitudinal slit is connected with the transverse slit to form an L-shaped slit, and a coupling connection is formed in the transition section; after the slurry enters the coupling connection from the longitudinal slit, it is driven by the base film arranged on the conveying substrate, moves along the longitudinal slit and is directly filmed under shear stress; The angle between the back plate and the transmission substrate is α , the transition section is chamfered, and the radius of the chamfer is β ; The radius of the chamfer is r The height of the transverse slit is h The length of the transverse slit is l ; Scrape coating slurry viscosity η , the departure angle of the blade γ , and satisfy: 15＜ α ＜135°； 0°＜ β ＜135°； 0≤ r ≤ 20 cm; 3μm≤ h ≤5 mm; 1 cm≤ l ≤15 cm; 3 mPa s≤ η ≤10 10 mPa·s; γ ≤90°； The longitudinal slits are parallel slits or V-shaped slits; the transverse slits are parallel slits formed by two parallel plates or curved slits formed by hyperbolic plates; The V-shaped slit is a buffer-type slit that is wide at the top and narrow at the bottom; the hyperbolic panels have the same shape, the V-shaped slit is wide at the top and narrow at the bottom, sealed on all sides, and has an opening at the top and a slit at the bottom, and the overall structure is an inverted triangular prism; The transverse slit is a single-sided assembly coupling base film slit, and the slit plate of the single-sided assembly coupling base film slit is a plate with high flatness and low roughness.

2. The self-coupling L-shaped slit double-plate coating blade according to claim 1, characterized in that: The slit plate has a height adjustment structure and / or a width adjustment structure, and the conveying substrate is coupled with a moving base film system.

3. The self-coupling L-shaped slit double-plate coating blade according to claim 1, characterized in that: The cutter head includes a side plate, a lower plate, an upper plate and a linear bearing. The lower plate is fixed between the bottoms of two opposite side plates; the two side plates are fixed together at the bottom of the upper plate; the cutter head is connected to the back plate through the linear bearings on both ends of the upper plate.

4. The self-coupling L-shaped slit double-plate coating blade according to claim 3, characterized in that: The back plate includes a transmission base, a notch adjustment member, a slot plate, a fixed optical axis, a micrometer and a pressure spring; The linear bearing is connected to the notch adjustment member of the back plate; The notch adjustment member is fixed on the transmission base, and the lateral position is adjusted through the hole on the transmission base. The slot plate and the fixed optical axis are fixed on the notch adjustment member. The top end of the fixed optical axis is connected to a micrometer head for controlling the height of the upper plate. The pressure spring is installed on the fixed optical axis to provide resistance for fixing the upper plate.

5. The self-coupling L-shaped slit double-plate coating blade according to claim 1, characterized in that: The number of the blade heads is n, n≥2, and the n blade heads are arranged side by side, and the bottoms are on the same plane. The n blade heads are coupled and connected in sequence with the n transverse slits formed by the transmission base, wherein the first blade head and the back plate form a first longitudinal slit; and the nth blade head and the side wall of the n-1th blade head form an nth longitudinal slit, forming a total of n longitudinal slits; The same or different types of slurries are added into the n longitudinal slits.

6. The self-coupling L-shaped slit double-plate coating blade according to claim 1, characterized in that: The bottom of the cutter head is also provided with a curing unit, which acts on the slurry on the surface of the base film so that the slurry is cured to form a semi-wet film state.

7. A system for slurry coating using a self-coupling L-shaped slit double-plate coating blade as claimed in any one of claims 1 to 6, characterized in that: The system is any one of a slot roll-to-roll device, a printing device, and a device with slot coating.

8. A coating method, characterized in that: A self-coupling L-shaped slit double-plate coating scraper according to any one of claims 1 to 6; the coating method comprises: injecting the slurry into the longitudinal slit; After the slurry enters the coupling connection, it is driven by the base film arranged on the transmission substrate and moves along the longitudinal slit; During the movement, the slurry is directly filmed on the base film under the shear stress.

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