Coating blade, roll-to-roll coating and film production line, system and method

Abstract

A self-coupling L-shaped slit double-plate coating blade, a roll-to-roll coating and film production line, a system and a method. The self-coupling L-shaped slit double-plate coating blade comprises 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, a transition section (116) is formed between the side surface and the bottom surface, and a longitudinal slit (131) for slurry injection is formed between the back plate (12) and the bottom of the blade head (11). A transverse slit (132) having a length 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 communicated with the transverse slit (132) to form an L-shaped slit. The coating blade has a compact structure and is precisely adjustable, so that the slurry in the transverse slit is more compact and uniform, thereby reducing coating defects and improving film forming quality.

Description

A coating doctor blade, roll-to-roll coating film production line, system and method

[0001] Cross-references to related applications

[0002] This disclosure claims priority to Chinese patent application No. 2024118111182, filed on December 10, 2024, and Chinese patent application No. 2025100465647, filed on January 13, 2025, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of coating technology, specifically to a coating doctor blade, roll-to-roll coating film production line, system, and method. Background Technology

[0004] In the field of coating technology, mainstream technologies include spin coating, vacuum evaporation, and magnetron sputtering. In commercially available large-scale coating technologies, screen printing, roll-to-roll coating, inkjet printing, and vacuum evaporation hold a dominant position. Slit coating technology, a type of roll-to-roll coating, can prepare high-quality functional films using a non-contact printing method, offering advantages such as suitability for large-scale production, high uniformity, and a wide range of thickness adjustment. It has wide applications, particularly 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 doctor blade structure mainly includes: a moving transport substrate 15, a slit cavity, and a pumping system.

[0005] Currently, the research and design focus of slot coating doctor blade structures is on the internal cavity structure and the die head exit structure. Among them, the cavity storage tank and liquid channel determine the uniformity of slurry flow; the size and structure of the slot die head exit determine the coating width; and the discharge speed, slurry viscosity, and substrate surface properties determine the coating film thickness.

[0006] With the rapid development of new energy materials technology, coating technologies used in traditional printing, packaging, and plastics industries are gradually shifting towards emerging industries such as fuel cells, hydrogen production, energy storage, lithium batteries, solar photovoltaics, and environmental water treatment. This places higher demands on coating technology, requiring newer technologies and faster iteration. Traditional roll-to-roll coating technology has the advantages of high efficiency and large-scale production. However, the simple and inaccurate blade designs commonly used in traditional coating equipment make it difficult to meet the production requirements of emerging thin film materials for ultra-high precision and ultra-low film thickness. On the other hand, traditional coating equipment has simple processes and limited functions, typically including only a few steps such as unwinding, coating, solvent thermal evaporation curing, and rewinding. These steps can usually only complete the coating of traditional membrane material slurries and the preparation of traditional membrane materials.

[0007] Furthermore, traditional roll-to-roll coating production lines can only perform post-processing of the coated layer in an atmospheric environment. However, the rapidly developing film industry has introduced many environmentally sensitive slurries, such as those requiring anaerobic, dry, or special gas atmospheres. Typically, the coated slurry and the cured coating cannot withstand scraping, rubbing, or pressure, otherwise it will lead to coating defects, peeling, or changes in the coating's micro-nano structure. However, the film material in roll-to-roll production lines is in a continuous moving state, and traditional line-sealing and surface-sealing strategies inevitably damage the coating. To address this problem, the conventional approach is to enclose the entire roll-to-roll production line in a factory with a specific environmental atmosphere. This results in extremely high technical difficulty (high sealing technology for the entire factory), high manufacturing costs (high cost of the sealing structure for the entire factory), and high operating costs (a huge amount of pure gas is needed to replace the air during a single start-up of the entire factory). In addition, the oxygen-free, dry, or special gas atmosphere of the entire factory inevitably prevents personnel from entering the factory to operate the roll-to-roll equipment. Special "spacesuit-like" equipment is required for entry.

[0008] Emerging thin film materials place more stringent, complex, and diverse demands on processing techniques. For example, the precision of slurry coating and the application of squeegee force are more complex; specific atmosphere protection (such as inert gas, specific temperature and humidity) is required during slurry coating; atmosphere protection that meets process requirements must be provided without damaging the coating; constant temperature, humidity, and gas atmosphere must be maintained in the curing stage; induction factors for curing the film must be introduced non-invasively; and specific requirements exist for substrate selection and additional protective coatings. Technical issues

[0009] Existing slot coating tools require extremely high precision in the design and manufacturing of the slot structure, its flatness, and the parallelism of the blade. Even minute structural errors can directly compromise the uniformity and integrity of the coating. Furthermore, even minor vibrations and deformation errors of the slot coating blade during operation can severely affect the uniformity of the slurry application, thereby impacting the coating quality.

[0010] Traditional roll-to-roll coating technology, with its limited functionality, low coating precision, and single curing conditions, is unable to meet the diverse process and precision requirements of emerging coated film materials. Against the backdrop of cost reduction, reduced reliance on manual labor, and promotion of intelligent and large-scale production in the new energy industry, roll-to-roll coating equipment needs to develop towards precision, continuous operation, customization, and multi-functionality. Technical solutions

[0011] To overcome the shortcomings of existing slot coating technology, this application provides a coating doctor blade, a roll-to-roll coating production line, system, and method. The self-coated L-shaped slot double-plate coating doctor blade has a compact and precisely adjustable structure. This roll-to-roll coating production line combines an atmosphere protection and curing system, achieving contactless atmosphere sealing protection and contactless external light source separation-type ultraviolet curing during roll-to-roll operation. The film material is then removed from the atmosphere protection and heated before being rolled up via a single-contact exchange system in the transport structure; thus achieving a high-precision and stable coating process.

[0012] To achieve the above objectives, this application adopts the following technical solution:

[0013] A self-coupling L-shaped slit double-plate coating doctor blade includes:

[0014] The cutter head has a slit plate, a side surface, and a bottom surface, with a transition section between the side surface and the bottom surface, and the slit plate is disposed at the bottom of the cutter head;

[0015] A back plate, wherein a longitudinal slit for injecting slurry is formed between the back plate and the bottom of the cutter head;

[0016] The transfer substrate and the slit plate form a transverse slit with a length of not less than 0.5 cm. The longitudinal slit and the transverse slit are connected 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 transfer substrate, moves along the longitudinal slit and is directly formed into a film under shear stress.

[0017] The angle between the back plate and the conveying substrate is α. A chamfer is provided in the transition section, with an arc of β. The radius of the chamfer is r. The height of the transverse slit is h, and the length of the transverse slit is l. The viscosity of the scraping slurry is η, and the departure angle of the blade is γ, satisfying the following:

[0018] 15<α<135°; 0°<β<135°; 0≤r≤ 20cm; 3μm≤h≤5 mm; 1 cm≤l≤15 cm; 3 mPa·s≤η≤10 10 mPa·s; γ≤90°.

[0019] A system for applying slurry using a self-coated L-shaped slit double-plate coating doctor blade, wherein the system is any one of a slit roll-to-roll device, a printing device, or a device with slit coating.

[0020] A coating method, based on the aforementioned self-coupling L-shaped slit double-plate coating doctor blade; the coating method includes:

[0021] Inject the slurry into the longitudinal slit;

[0022] After the slurry enters the coupling connection, it is driven by the base film arranged on the conveying substrate to move along the longitudinal slit.

[0023] During the process, the slurry is subjected to shear stress and forms a film directly on the base film.

[0024] A roll-to-roll coating and film-making production line includes:

[0025] Base membrane device, the base membrane device providing a base membrane;

[0026] A front protective coating device, wherein the front protective coating device provides a support film; the base film is adsorbed onto the support film to form a composite film;

[0027] An atmosphere chamber, in which the composite membrane enters a sealed atmosphere chamber;

[0028] A coating apparatus, which is disposed in the atmosphere chamber, is used to coat the composite film that enters the atmosphere chamber;

[0029] A curing device is used to cure the coated composite film, and the cured composite film leaves the atmosphere chamber.

[0030] A heat drying device is used to heat dry the composite film after it has been cured.

[0031] The post-peeling film coating device includes a support film peeling roller, a protective film coating roller, and a take-up roller. The composite film is peeled off by the support film peeling roller, then the protective film is adsorbed and coated, and then wound up on the take-up roller.

[0032] The coating apparatus employs a self-coupling L-shaped slit double-plate coating blade as described in any one of the claims. Specifically, it includes a blade head, a back plate, and a conveying substrate. A longitudinal slit for injecting slurry is formed between the back plate and the bottom of the blade head; a transverse slit is formed between the conveying substrate and the bottom surface of the blade head, and the longitudinal and transverse slits communicate to form an L-shaped slit; the included angle between the back plate and the conveying substrate is α; the transition section of the blade head is chamfered with an arc of β; the radius of the chamfer is r; the height of the transverse slit is h; and the length of the transverse slit is l; the viscosity of the coating slurry is η; and the departure angle of the blade head is γ, satisfying the following:

[0033] 15°<α<135°; 0°<β<135°; 0≤r ≤ 20 cm; 3μm≤h≤5 mm; 1 cm≤l≤15 cm; 3 mPa·s≤η≤1010 mPa·s; γ≤90°.

[0034] A coating machine employs the aforementioned roll-to-roll coating film production line.

[0035] A roll-to-roll equipment, employing the aforementioned roll-to-roll coating and film-making production line.

[0036] A curing device employing the aforementioned roll-to-roll coating film production line.

[0037] A device with coating process as the main or secondary structure, employing the aforementioned roll-to-roll coating film production line.

[0038] A roll-to-roll coating film production method, based on the aforementioned roll-to-roll coating film production line; the roll-to-roll coating film production method includes:

[0039] Provide base film and support film;

[0040] The support membrane is adsorbed onto the back of the base membrane;

[0041] The composite membrane formed by the base membrane and the support membrane enters a sealed atmosphere environment;

[0042] The composite membrane entering the atmospheric environment is coated;

[0043] The coated composite film is then cured.

[0044] The composite film after curing is subjected to heat drying treatment;

[0045] After the supporting film is peeled off, the composite film is then coated with a protective film and finally rolled up. Beneficial effects

[0046] In this application, the longitudinal and transverse slits are connected by a rounded chamfer. When the slurry flows into the transverse slit, it is affected by shear force, resulting in a more compact and uniform slurry, reducing coating defects and improving film quality. An adjustable slot seals the longitudinal slit, achieving both slit adjustability and sealing with low processing precision. The L-shaped slit coating plate's precise plane forms a transverse slit with the conveyed base film. The length of the transverse slit is crucial to the coating effect, especially requiring a minimum length of 0.5 cm between the conveyed substrate and the bottom surface of the cutter head. This ensures excellent film performance and meets coating quality requirements. This application integrates the slit and the conveyed base film, optimizing the adjustment difficulty of both and effectively increasing the stability of slit coating output.

[0047] This application's apparatus includes a base film unit, a pre-protective coating unit, a coating unit, an ultraviolet curing unit, a heat drying unit, and a post-coating peeling unit. The base film unit includes a base film roller for winding and supplying the base film. The base film is the fundamental material for the coating operation. The pre-protective coating unit includes a support film roller for winding a support film. The support film is adsorbed onto the back of the base film to form a composite film. This composite structure helps maintain the flatness and stability of the base film during the coating process. The coating unit is set in a sealed atmosphere chamber to perform the coating operation on the composite film entering the atmosphere chamber. The curing unit cures the coated composite film. The heat drying unit is used to further heat dry the cured composite film. This helps ensure complete curing of the coating and improves the overall performance and stability of the film. The composite film passes through a support film peeling roller to peel off the support film. Then, a protective coating is adsorbed to form a new composite structure. Finally, this new composite film is wound onto a take-up roller, completing the entire coating and film-making process.

[0048] The base film unit enables continuous production, significantly improving production efficiency. The use of a support film helps maintain the flatness of the base film, thereby improving coating quality. This unit can adapt to different types of base films and coating materials. Various curing methods are available, allowing selection of the most suitable method based on the coating material. Ultraviolet curing is an environmentally friendly method that does not produce harmful waste gas or wastewater. Adsorption technology ensures a tight fit between the support film and the protective coating, preventing bubbles and wrinkles during coating. Curing and heat treatments help improve the overall performance and stability of the film, resulting in better durability and service life. The entire unit can be automated, reducing manual intervention and improving production efficiency and product quality. Attached Figure Description

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

[0050] Figure 2 is a schematic diagram of a planar coating blade embodiment based on this application and its cross-sectional flow channel, wherein (a) is a perspective view and (b) is a cross-sectional view;

[0051] Figure 3 is a schematic diagram of the curved surface coating doctor blade structure based on this application;

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

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

[0054] Figure 6 shows a comparison of the feasibility and effects of scraping coating;

[0055] Figure 7 is a microstructure diagram of the coating effect of the surfactant solution based on the coating blade structure shown in Figure 2.

[0056] Figure 8 shows the coating microstructure of the surfactant solution based on the curved coating doctor blade structure shown in Figure 3.

[0057] Figure 9 is a micrograph of the coating effect of the polymer solution based on the pretreated structure shown in Figure 4.

[0058] Figure 10 is a polarized light micrograph of the coating of polyarylether polymer solution slurry on the cutter head structure with double-layer continuous coating as shown in Figure 5.

[0059] Figure 11 is a micrograph of the polymer slurry coating;

[0060] Figure 12 is a micrograph of the coating of surfactant liquid crystal slurry.

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

[0062] Figure 13 is a schematic diagram of the roll-to-roll coating process of this application;

[0063] Figure 14 is an enlarged schematic diagram of the atmosphere box in Figure 13;

[0064] Figure 15 is a schematic diagram of the roll-to-roll double slit coating production line structure of this application;

[0065] Figure 16 is a schematic diagram of the structure of the protective film coating roller in this application;

[0066] Figure 17 is a schematic diagram of the coating apparatus of this application;

[0067] Figure 18 is a schematic diagram of the ultraviolet curing device of this application;

[0068] Figure 19 is a schematic diagram of the structure of the hot drying device and the post-film peeling and coating device of this application.

[0069] Among them, 100 is the base film roller; 101 is the upper roller; 200 is the support film roller; 201 is the first electrostatic discharge device; 202 is the lower roller; 300 is the atmosphere chamber; 301 is the gas valve; 302 is the inlet; 303 is the outlet; 304 is the first support roller; 305 is the second support roller; 306 is the lower contact base plate; 307 is the upper gas curtain; 400 is the coating device; 401 is the back plate; 402 is the cutter head; 500 is the conveying substrate; 600 is the water-cooled ultraviolet curing lamp; 700 is the water-cooled temperature control substrate; 800 is the hot drying device; 900 is the post-film peeling and coating device; 901 is the support film peeling roller; 902 is the protective film coating roller; 903 is the second electrostatic discharge device; 904 is the winding roller; and 1000 is the cabinet.

[0070] Implementation methods of this application

[0071] To make the technical problems, technical solutions, and beneficial effects of this application clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0072] This application provides a slit coating technology solution with a self-coupling L-shaped slit channel. The principle is shown in Figure 1. Specifically, the first objective is to provide a self-coupling L-shaped slit double-plate coating blade, including: a blade head 11, a back plate 12, and a transfer 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 surface of the blade head 11; a transverse slit 132 with a length of not less than 0.5 cm is formed between the transfer substrate 15 and the bottom surface of the blade head 11, and the longitudinal slit 131 and the transverse slit 132 are connected to form an L-shaped slit, and a coupling connection is formed at the transition section 116; after the slurry enters the coupling connection, it is driven by the base film 14 arranged on the transfer substrate 15, moves along the longitudinal slit 131, and is directly formed into a film under shear stress.

[0073] In the above scheme, the cutter head 11 has a side surface and a bottom surface, with a transition section 116 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 and the transverse slit 132 communicate to form an L-shaped slit, and a coupling connection is formed at the transition section 116.

[0074] The transmission base 15 is mounted on the support 16, which is a smooth, rigid support.

[0075] During the coating process, the slurry is injected through the longitudinal slit 131 between the back plate 12 and the bottom of the cutter head 11. After entering the coupling connection, the slurry is driven by the base film 14 on the transfer substrate 15 and moves along the longitudinal slit 131. During the movement, the slurry is subjected to shear stress, directly forming a thin film on the base film 14. The formed thin film moves together with the base film 14, ultimately completing the coating process.

[0076] Therefore, the L-shaped slit design subjectes the slurry to multiple compressions and constraints during flow, thereby improving the uniformity and precision of coating. By adjusting the size and shape of the slit, precise control over the coating thickness and uniformity can be achieved. 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, providing sufficient flow space for the slurry and making the coating process more stable. The interconnected design of the longitudinal slit 131 and the transverse slit 132 allows the slurry to be rapidly and uniformly coated onto the base film 14. The driving effect of the base film 14 makes the coating process more continuous and efficient. Precise coating control reduces slurry waste. Waste generated during the coating process can be easily collected and disposed of. The slit design makes the cleaning process easier and more thorough.

[0077] In the above scheme, the cutter head 11 undergoes structural self-coupling when used with a smooth rigid support, forming a slit structure with the first and second surfaces self-coupling; the longitudinal slit 131 of the slurry storage tank and the slit between the first and second surfaces form an L-shaped slit; a double-plate structure is formed by the rigid first surface and the rigid second surface; the coating substrate moves unidirectionally against the second surface. In Figure 1, all black areas indicate that the structural components are rigid structural components, and the light-colored areas indicate the coating slurry to be coated.

[0078] Specifically, the self-coupling L-shaped slit double-plate coating blade of this application includes a longitudinal slit 131 and a transverse slit 132. The longitudinal slit 131 is wider at the top and narrower at the bottom, sealed around the four sides, with an opening at the top and a slit at the bottom, and is in the shape of an inverted triangular prism. The transverse slit 132 is composed of a slit plate 110 with high flatness and low surface roughness and a transfer substrate 15. The transverse slit 132 is connected to the longitudinal slit 131 by the slit plate 110, and the connection is rounded and chamfered. The transverse slit 132 is connected to the bottom of the longitudinal slit 131 to form an L-shaped slit coating.

[0079] In the above scheme, the design of the self-coated L-shaped slit double-plate coating blade combines the features 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 wider at the top and narrower at the bottom, sealed on all sides, leaving only a top opening and a bottom slit, and is shaped like an inverted triangular prism. This design allows the coating liquid to flow out evenly along the slit channel under pressure. Under a certain pressure, the coating liquid enters the longitudinal slit 131 through the top opening and maintains a certain flow rate within the slit. Due to the shape and size design of the slit, the coating liquid is subjected to a certain amount of compression and restriction during the outflow process, thereby ensuring that the coating liquid can be uniformly and stably coated on the substrate. The transverse slit 132 consists 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 the connection is rounded at the chamfer to reduce resistance during the coating process. The transverse slit 132 connects to the bottom of the longitudinal slit 131, forming an L-shaped slit coating structure. During the coating process, the coating liquid flows out from the longitudinal slit 131 and continues to coat the substrate along the channel of the transverse slit 132. Due to the design of the transverse slit 132, the coating liquid is further restricted and homogenized during the outflow process, thereby ensuring that the coating layer has higher uniformity and precision.

[0080] Furthermore, the coating liquid enters the longitudinal slit 131 under pressure through the top opening, maintaining a certain flow rate and velocity within the slit. The coating liquid then flows out along the longitudinal slit 131 and connects with the transverse slit 132. In the transverse slit 132, the coating liquid is further confined and homogenized, ultimately coating the transfer substrate 15. Due to the special design of the longitudinal slit 131 and the transverse slit 132, the coating liquid undergoes multiple compressions and confinements during its outflow, ensuring higher uniformity and precision in the coating layer. In addition, the L-shaped structure design reduces bubbles and impurities during the coating process, further improving coating quality. The self-coupling L-shaped slit double-plate coating blade design allows it to adapt to coating liquids of different viscosities and solid contents. By adjusting the size and shape of the slits, precise control of the coating layer thickness and uniformity can be achieved.

[0081] The slit plate 110 of the transverse slit 132 can be adjusted for parallelism with the transfer substrate 15 via four adjustable bolts; the width of the transverse slit 132 can be adjusted via a micrometer head 125. The parallelism of the transverse slit 132 can be precisely adjusted via the adjustable bolts, reducing coating uniformity differences caused by slit parallelism.

[0082] In the above-described scheme, the shape of the longitudinal slit 131, with its wider top and narrower bottom design, facilitates the uniform distribution and flow of the coating, preventing coating accumulation or uneven coating formation within the slit. The four sides are sealed, leaving an opening at the top and a slit at the bottom, ensuring the coating flows out only through a predetermined path, improving coating accuracy and consistency. The slit plate 110, with its high flatness and low surface roughness, helps reduce resistance during coating flow, improving coating smoothness. The rounded chamfer at the connection between the slit plate 110 and the longitudinal slit 131 reduces coating accumulation and friction at the turning point, further improving the coating effect. Adjusting the parallelism between the transverse slit 132 plate and the conveyor substrate 15 using four adjustable bolts ensures uniform coating distribution within the transverse slit 132 during coating, preventing uneven coating thickness. The optional high-precision adjustment function of the micrometer head 125 allows the user to precisely adjust the width of the transverse slit 132 as needed, thereby controlling the coating thickness and uniformity.

[0083] In Figure 1, the angle between the back plate 12 and the conveying substrate 15 is α, the transition section 116 is chamfered with an arc of 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. When the viscosity of the coating slurry η and the departure angle γ of the blade 11 are met, a better coating effect can be obtained. The specific parameters are as follows:

[0084] 15<α<135°; 0°<β<135°; 0≤r≤ 20cm; 3μm≤h≤5 mm; 1 cm≤l≤15 cm; 3 mPa·s≤η≤10 10 mPa·s; γ≤90°.

[0085] In particular, the length of the transverse slit 132 is l, which satisfies the requirement that the length is not less than 0.5 cm and further satisfies that 1 cm ≤ l ≤ 15 cm. This enables automatic film formation and effectively controls the thickness and uniformity of the coating. This is also a key parameter of the self-coupling L-shaped slit double-plate coating doctor blade of this application.

[0086] In Figure 1, v1 is the slurry inlet velocity, and the direction is indicated by the arrow; v2 is the conveying velocity of the conveying substrate, and the direction is indicated by the arrow.

[0087] The applicant's research has found that setting the length of the transverse slit 132 to l, and especially to a length of not less than 0.5 cm, within this specific size range, has significant advantages for achieving an automated film formation 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 thin film during the film formation process. This discovery is based on a deep understanding of fluid dynamics principles and experimental verification.

[0088] In particular, blades with a length of at least 0.5 cm are superior to traditional doctor blades. Traditional doctor blades typically lack a transverse slit 132, or the slit 132 depends on the blade thickness (both less than 0.5 cm), and the surface of the slit 132 is not finely ground, thus its roughness is not controlled. This results in poor coating quality, as the quality of liquid film coating depends on the blade's edge precision. Furthermore, traditional doctor blades lack a transition section 116, leading to insufficient smoothness in the supply of slurry to the coating layer during the coating process. Using a transition section 116 can improve the smoothness of slurry feeding to the liquid film surface.

[0089] Compared to traditional slot coating doctor blades, which operate on a similar principle to dispensing machines, this method only extrudes the coating slurry without scraping it. The thickness of the liquid film depends on the dispensing rate and the blade's movement speed; the blade itself does not perform any "scraping" action on the liquid film. Even if a few doctor blades do have a certain thickness, this thickness is typically less than 0.5 cm and does not participate in scraping.

[0090] Specifically, when the length l of the transverse slit 132 meets the above conditions, the flow rate and volume of the fluid can be precisely controlled as it passes 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 within it. A transverse slit 132 of continuous length ensures a certain scraping force, thereby affecting the deposition effect and uniformity of the coating.

[0091] Furthermore, by adjusting the length l of the transverse slit 132, the applicant has discovered that effective control over the coating thickness can be achieved. A longer slit may allow more fluid to pass through, and the required length allows the fluid to be subjected to shear stress for a longer period, resulting in a thicker and more uniform coating under the same conditions; while a shorter slit restricts the fluid flow, resulting in a thinner coating. Therefore, by precisely adjusting the slit length, the coating thickness can be customized according to actual needs. Thus, a transverse slit 132 length of not less than 0.5 cm not only achieves efficient and stable automatic film formation but also effectively controls the coating thickness and uniformity. This discovery also enables the self-coated L-shaped slit channel slit coating technology of this application to solve the quality problems caused by manual coating.

[0092] In the above scheme, the angle α between the back plate 12 and the conveying substrate 15 affects the flow pattern and pressure distribution of the coating at the transition point. An appropriate angle helps the coating transition smoothly at the transition point, avoiding coating defects. The design of the chamfer β and radius r of the transition section 116 can reduce friction and accumulation of the coating at the transition point, improving the smoothness and uniformity of the coating. The radius r also affects the flow rate and pressure distribution of the coating, which needs to be adjusted according to the viscosity of the coating and the coating speed. The thickness h and length l of the transverse slit 132 directly affect the coating thickness and coating speed. A thicker slit can provide a larger coating flow rate, but may lead to uneven coating thickness; a longer slit can extend the flow path of the coating, but may increase the coating time. The viscosity η of the coating slurry is one of the key factors affecting the coating effect. An appropriate viscosity can ensure that the coating flows uniformly in the slit, forming a smooth and uniform coating. Too high a viscosity may cause the coating to flow poorly, forming an uneven coating; too low a viscosity may cause the coating to flow too quickly, failing to form a sufficient coating thickness.

[0093] Furthermore, the departure angle γ of the blade head 11 in this application is ≤90°. This is one of the key differences from traditional slot coating blade heads. Only when this angle is less than 90° can it be guaranteed that the coated liquid film will not be "lifted up" by the departing blade head 11, thus preventing the liquid film from being damaged.

[0094] Therefore, the self-coupling L-shaped slit double-plate coating blade of this application, through its designed structure and parameter adjustments, can significantly improve the accuracy, consistency, and smoothness of coating. These parameters play a crucial role in the coating process and need to be finely adjusted according to the specific coating characteristics and coating requirements.

[0095] Furthermore, the self-coupling L-shaped slit double-plate coating blade of this application includes a longitudinal slit 131 and a transverse slit 132. The longitudinal slit 131 and the transverse slit 132 are coupled and connected. The shear stress generated by the large transition between the longitudinal slit 131 and the transverse slit 132 affects the state of the slurry.

[0096] More preferably, the longitudinal slit 131 is a parallel slit or a V-shaped slit. The transverse slit 132 is a standard slit composed of two parallel plates; the V-shaped slit is a buffer-type slit that is wider at the top and narrower at the bottom.

[0097] By studying the influence of the slurry state, including at least one of the following: material micro-orientation, slurry porosity, and fluid pressure; the applicant found that when the structure of the transverse slit 132 is a single-sided assembled coupling base film slit, the slit plate 110 is a plate with high flatness and low roughness, and the lower contact surface couples the roll-to-roll base film or other moving base film system; the slurry of the single-sided assembled coupling base film slit is driven by the base film 14 and directly forms a film without transfer after passing through the transverse slit 132.

[0098] The slotted plate 110 provided in this application has high flatness and low roughness, and its height and parallelism are adjustable to adapt to different coating requirements and process parameters.

[0099] The pretreatment process of this application also forms a slit plate 110 with a pretreatment function by applying a composite perturbation field. Specifically, this can be a curing unit 17. In operation, a mounting position is provided for installing the curing unit 17. The curing unit 17 can be a heat source, electrode, magnetic pole, or light source, and can be connected to an external power supply via wires, thereby applying an external field in situ and synchronously at the scraper position. The composite perturbation field includes at least one of an additional force field, thermal field, optical field, alternating / direct current / pulsed electric field, and magnetic field.

[0100] During the manufacturing process of the slot plate 110, a composite perturbation field is applied to improve its performance, enabling it to match the composite perturbation field effect of the curing unit 17. The composite perturbation field used in the manufacturing of the slot plate 110 includes at least one of an additional force field, thermal field, optical field, alternating / direct / pulsed electric field, and magnetic field. These perturbation fields can modulate the microstructure and surface properties of the slot plate 110, thereby improving its flatness and reducing its roughness. By applying the composite perturbation field, a pretreated composite slot plate 110 is formed. The pretreatment process optimizes the surface morphology and properties of the slot plate 110, making it more suitable for coating applications.

[0101] This technology utilizes a special L-shaped slit to improve the uniformity of slurry flow. The highly flat and parallel plate surface can evenly spread the slurry through shear friction, significantly reducing the reliance of the doctor blade on the precision of the slit structure, simplifying the coating process, and improving coating quality. The highly parallel and flat plate surface also allows for adjustment of the outlet width according to specific working conditions, effectively controlling coating quality.

[0102] The specific implementation of this application will be described in further detail below with reference to the accompanying drawings and embodiments. The following embodiments are used to illustrate this application, but are not intended to limit the scope of this application.

[0103] Example 1: Referring to Figure 2, this example provides a specific structure of a self-coupling L-shaped slit double-plate coating blade based on Figure 1, including: a blade head 11 and a back plate 12. The blade head 11 includes a lower plate 111, side plates 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 sides of the two side plates 112 and is fixed together to the bottom of the upper plate 114; the blade head 11 is connected to the back plate 12 through the linear bearings 115 at both ends of the upper plate 114.

[0104] 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 is fixed together with the side plate 112 to the longitudinal plate 113. The cutter head 11 is connected to the slot adjustment member 122 of the back plate 12 through linear bearings 115 at both ends of the longitudinal plate 113.

[0105] As a specific embodiment, the backplate 12 includes a base plate 121, a slot adjustment component 122, a slot plate 123, a fixed optical axis 124, a micrometer 125, and a pressure spring 126; a linear bearing 115 is connected to the slot adjustment component 122 of the backplate 12. The slot adjustment component 122 of the backplate 12 is fixed to the base plate 121 and its lateral position can be adjusted 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 slot adjustment component 122. The top of the fixed optical axis 124 is connected to the micrometer 125 to control the height of the upper plate 114. The pressure spring 126 on the fixed optical axis 124 provides resistance to fix the upper plate 114.

[0106] Furthermore, after adjusting the cutter head 11 to a suitable height using the micrometer head 125, it is clamped and sealed by the slot adjustment component 122, forming an L-shaped slit channel with the longitudinal slit 131 and the transverse slit 132 coupled together.

[0107] As an example, the base film 14 passes through a 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 it to the transverse slit 132. The substrate 121 groove allows the continuously transported base film 14 to pass through, and the base film 14 carries the slurry at the bottom of the longitudinal slit 131 into the transverse slit 132. This arrangement allows the slurry to be more compacted under shear stress after entering the transverse slit 132.

[0108] Furthermore, the slurry directly forms a film after passing through the transverse slit 132 formed by the base film 14 and the lower plate 111. Traditional parameters for controlling the slit cutter head 11, such as slurry flow rate, base film 14 movement speed, slit width, die opening, distance between the die head and base film 14, and angle, are optimized to achieve high-precision slit coating with only two simple parameters: base film 14 speed and slit height. In this embodiment, the length l of the transverse slit 132 satisfies 1 cm ≤ l ≤ 15 cm. Specifically, it is set to 10 cm.

[0109] Furthermore, the substrate 121 can be mounted at an angle, making the longitudinal slit 131 a V-groove, providing a buffer angle during material injection to prevent air bubbles from forming. This also increases the force on the slurry at the bottom of the slit, making it easier for the slurry to enter the transverse slit 132 along with the base film 14.

[0110] In this embodiment, the lower plate 111 is the slit plate 110 described above.

[0111] Example 2: The L-shaped slit scraper's transverse slit 132 can be configured with slit plates 110 of different shapes according to different working conditions. Figure 3 shows the principle diagram of curved surface coating application in this embodiment. The slit plate 110 is set with the curved surface of the roller base 152 that can fit the arc to form a curved transverse slit 132, which is coupled with the longitudinal slit 131 to form an L-shaped slit. The width of the curved transverse slit 132 can be controlled 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 into the curved transverse slit 132. This configuration also achieves the effect of making the slurry more compact under shear stress 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 surface coating wet film that fits well with the roller base 152 can be directly formed at the outlet.

[0112] As an optional solution, a curing unit 17 is also provided at the bottom of the slotted plate 110. 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. See Example 3 for a specific solution.

[0113] Example 3: This application can be extended to a pre-treatment L-shaped slot coating technology according to the requirements of slurry wet film treatment. Figure 4 shows a schematic diagram of the L-shaped slot pre-treatment coating technology of this application, including a longitudinal slot 131 and a transverse slot 132. The longitudinal slot 131 and the transverse slot 132 are coupled and connected in the manner of Example 1. After the slurry is injected into the V-shaped groove, it is uniformly stressed and enters the transverse slot 132 in a compacted state in the manner of Example 1. The transverse slot 132 is a multifunctional slot plate 110 obtained by combining the slot plate 110 with the curing process in Example 1. The combined curing process is one or more of the curing methods such as thermosetting, photosetting, magnetic, and ultrasonic. The slurry is pre-treated in the transverse slot 132 and forms a pre-treated semi-wet film state on the surface of the base film 14 after passing through the slot, which facilitates subsequent curing treatment.

[0114] Traditional slot coating pretreatment can easily lead to poor slurry flow at the outlet, preventing the base film 14 or roller from effectively adhering to and carrying away the material, or causing blockage at the slot outlet due to excessive curing. The technical advantage of this embodiment is that the transverse slot 132 is a coupling slot, and the slurry remains in contact with the base film 14 throughout 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 cutter heads 11, where n ≥ 2. The n cutter heads 11 are arranged side by side with their bottoms on the same surface. The n cutter heads 11 are sequentially coupled and connected to the n transverse slits 132 formed by the conveying base 15. The first cutter head 11 forms a first longitudinal slit 51 with the back plate 12; and the nth cutter head 11 forms an nth longitudinal slit 131 with the sidewall of the (n-1)th cutter head 11, forming a total of n longitudinal slits 131. The same or different types of slurry are added to the n longitudinal slits 131. See Example 4 for a specific solution.

[0116] Example 4: This application can be extended to a multi-condition L-slit coating technology according to the slurry requirements. As shown in Figure 5, this example illustrates a double-layer L-slit coating. Of course, more layers can also be arranged using this embodiment. Specifically, it includes: 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 as in Example 1. The transition transverse slit 52 can be pre-treated with a curing unit 17 according to Example 3 to prevent the two slurries from mixing, depending on the actual slurry conditions. The curing unit 17 acts on the slurry on the surface of the base film 14, causing the slurry to solidify and form a semi-wet film. The transition transverse slit 52 connects to the transverse total slit 54, and the bottom of the second longitudinal slit 53 merges with the transition transverse slit 52 to the transverse total slit 54 through a pre-slit 55. The pre-slit 55 is an L-shaped turning slit with a base plate. Its structural function is to prevent the slurry at the bottom of the second longitudinal slit 53 from acting directly and perpendicularly on the slurry on the transition transverse slit 52. This ensures sufficient force on the slurry at the bottom of the second longitudinal slit 53, preventing excessive pressure on the slurry in the transition transverse slit 52 from affecting film formation. The end of the pre-slit 55 connects to the transition transverse slit 52 at a small angle.

[0117] Two different component slurries are injected into the first longitudinal slit 51 and the second longitudinal slit 53 respectively. The first type of slurry enters the transition transverse slit 52 after undergoing compressive and shear stress. The second type of slurry, after undergoing the same compressive and shear stress at the pre-slit 55, is driven at a small angle by the pre-treated or untreated first type of slurry in the transition transverse slit 52 into the transverse total slit 54, ultimately forming a tight double-layer membrane structure.

[0118] The second objective of this application is to provide a system employing the aforementioned self-coupling L-shaped slit double-plate coating doctor blade; the system is any one of a slit coating machine, a slit roll-to-roll device, a printing device, and a device with slit coating.

[0119] The aforementioned self-coupling L-shaped slit double-plate coating doctor blade is applied to various coating equipment for slurry coating, such as slit coaters, slit roll-to-roll machines, printing equipment, and equipment with slit coating functions. These devices, by integrating the self-coupling L-shaped slit double-plate coating doctor blade, can achieve high-precision and high-efficiency coating operations.

[0120] As an example, the design of the self-coated L-shaped slit double-plate coating doctor blade enables a more precise coating process, achieving micron-level coating thickness control to meet the demands of high-precision coating. By optimizing the structure and parameters of the coating doctor blade, coating speed can be increased, production cycles shortened, and production efficiency improved. This system can adapt to different types of slurries and transfer substrates, meeting diverse coating requirements.

[0121] A third objective of this application is to provide a coating method based on the aforementioned self-coupling L-shaped slit double-plate coating blade; the coating method includes:

[0122] Inject the slurry into the longitudinal slit 131;

[0123] After the slurry enters the coupling connection, it is driven by the base membrane 14 arranged on the conveying substrate 15 to move along the longitudinal slit 131;

[0124] During the process, the slurry is subjected to shear stress and directly forms a film on the base film 14.

[0125] The third objective of this application is to provide a coating method based on a self-coated L-shaped slit double-plate coating doctor blade. The method involves injecting a slurry into a longitudinal slit 131. After entering the coupling connection, the slurry is driven by a base film 14 disposed on a transfer substrate 15, moving along the longitudinal slit 131. During this movement, the slurry is subjected to shear stress, directly forming a film on the base film 14.

[0126] As an example, this method utilizes the structural features of a self-coupled L-shaped slit double-plate coating doctor blade to achieve high-precision, high-uniformity coating operations, ensuring 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 the production cycle shortened. This method can adapt to different types of slurries and transfer substrates, meeting diverse coating needs. The system and coating method provided in this application have advantages such as high precision, high efficiency, strong adaptability, ease of maintenance, and energy saving and environmental protection, and can meet the high-precision coating needs of different fields.

[0127] The following examples are all based on the coating method described above.

[0128] Example 5: Feasibility and effectiveness of using the scraper structure shown in Figure 2 for coating; comparison results are shown in Table 1 and Figure 6:

[0129] Table 1 Comparison results of different slurries

[0130]

[0131] Example 6: Based on the coating method provided by the coating blade structure shown in Figure 2, a microstructure image of the coating effect of a surfactant solution with a viscosity of 10 mPa·s on the substrate is shown in Figure 7. Figure 7 shows a uniform and clear substrate layer and coating layer, proving that the coating was successful and uniform, demonstrating that the function can be achieved.

[0132] Example 7: Based on the coating method (curved surface type) provided by the curved surface coating doctor blade structure shown in Figure 3, a viscosity of 10 is coated on the substrate. 5 The microstructure of the coating effect of the mPa·s surfactant solution is shown in Figure 8. Figure 8 shows a uniform and clear substrate layer and coating layer, proving that the coating was successful and uniform, and demonstrating that the function can be achieved.

[0133] Example 8: Based on the coating method provided by the pretreatment structure coupled with the coating blade structure (planar type) shown in Figure 4, a viscosity of 10 is coated on the substrate. 10 The microstructure of the polymer solution coated at mPa·s is shown in Figure 9. Figure 9 shows a uniform and clear substrate and coating layer, demonstrating successful and uniform coating, and proving that the function can be achieved.

[0134] Example 9: Based on the coating method provided by the double-layer continuous coating blade 11 structure (planar type) shown in Figure 5, a viscosity of 10 is first coated on the substrate. 10 The polymer solution at a coating viscosity of 10 mPa·s 5 The microscopic image of the coating effect of the surfactant at mPa·s is shown in Figure 10. The microstructure is shown in Figure 10. The image shows a uniform and clear substrate layer, pre-treatment coating layer, and liquid film coating layer, which proves that the coating was successful and uniform, and that the function can be achieved.

[0135] Example 10: A polarized light micrograph of a coating of polyarylether polymer solution slurry, based on the cutting head 11 with the structural principle shown in Figure 1, is shown in Figure 11. As shown in Figure 11, after simultaneously rotating the polarizer and analyzer by 45°, the polarized light micrograph of the polymer solution slurry coating changes from completely bright to completely dark. This indicates that the polymer molecular chain segments within the coating can achieve oriented arrangement under the coating structure of the cutting head 11.

[0136] Example 11: A polarized light micrograph of a coating of surfactant liquid crystal slurry based on the cutting head 11 with the structural principle shown in Figure 1. As shown in Figure 12, after simultaneously rotating the polarizer and analyzer by 45°, the polarized light micrograph of the liquid crystal slurry coating changes from completely bright to completely dark. This indicates that the liquid crystal domains within the coating can achieve oriented arrangement under the coating structure of the cutting head 11 in this application.

[0137] As shown in Figure 13, the fourth objective of this application is to provide a roll-to-roll coating and film-making production line, including: a base film device, a front protective film covering device, a coating device 400, a curing device, a heat drying device 800, and a rear film peeling and film covering device 900.

[0138] The base film device includes a base film roller 100 for winding the base film; the front protective coating device includes a support film roller 200 for winding the support film, which is adsorbed onto the back of the base film; the composite film formed by the base film and the support film enters a sealed atmosphere chamber 300; the coating device 400 is set in the atmosphere chamber 300 for coating the composite film entering the atmosphere chamber 300; the curing device cures the coated composite film; the cured composite film leaves the atmosphere chamber 300; the heat drying device 800 is used to heat dry the cured composite film; the rear film peeling and coating device 900 includes a support film peeling roller 901, a protective film coating roller 902, and a take-up roller 904, the composite film peels off the support film from the support film peeling roller 901, then adsorbs the protective film, and is wound onto the take-up roller 904.

[0139] Furthermore, the front protective coating device is connected to the coating device 400, and the coating device 400 has an external curing device. According to the process requirements, it is sequentially connected to the heat drying device 800 and the rear film peeling and coating device 900. The front protective coating device attaches a layer of low-viscosity, easy-to-peel film for temporary support to the back of the base film. This device includes an electrostatic generator, which generates a first static electricity 201 to enhance the adhesion of the protective coating.

[0140] As an example, as shown in Figure 14, the coating device 400 is provided with a low-friction, inclined conveyor substrate 500 to provide coating compressive stress and support force. The cutter head 402 is designed as a right-angle slit cutter head 402 and is installed on the inclined conveyor substrate 500 platform for inclined coating. The curing device includes a quartz glass composite atmosphere chamber 300, an external water-cooled ultraviolet curing lamp 600 and a water-cooled temperature control substrate 700. The connection between the atmosphere chamber 300 and the roll-to-roll film transport structure is a single-sided contact structure with a back silicone seal and a front air knife seal. The area covered by the water-cooled ultraviolet curing lamp 600 in the atmosphere chamber 300 is made of ultraviolet-high transmittance quartz glass, and the ultraviolet irradiation area is made of water-cooled temperature control substrate 700 to prevent the temperature from becoming too high due to long-term ultraviolet irradiation. The heat drying device 800 is set after the curing device to further heat dry the cured composite film to remove moisture. The post-film peeling and coating device 900 includes a support film peeling roller 901, a protective film coating roller 902 and a take-up roller 904.

[0141] As a further improvement, the atmosphere-coupled UV curing system ensures that the slurry remains under atmospheric protection throughout the entire process from feeding to coating and curing into a film. Furthermore, the externally coupled UV curing system reduces the difficulty of temperature control within the atmosphere. The coating device 400 ensures tight adhesion to the base film, and the blade 402 applies the slurry to the base film surface under a combined shear and compressive stress field, optimizing film formation accuracy and stability. The front-covering and rear-peeling support film expands the range of base films that can be coated, enabling coating to be applied to porous base films, low-support films, low-mechanical-strength films, and other substrates that were previously difficult to coat. More importantly, in the air curtain contactless sealing scheme, single-contact nitrogen atmosphere material exchange prevents scratching defects caused by contact with the film surface while maintaining a constant atmosphere concentration (e.g., nitrogen, argon, vacuum atmosphere, etc.). The protective coating effectively improves the storage capacity and stability of the functional film material rolls.

[0142] Further, referring to Figure 13, the base film and the support film are pressed together by the upper roller 101 and the lower roller 202 to form a composite film, and the composite film enters the atmosphere chamber 300.

[0143] This application proposes a double-slit coating process on an inclined plane, based on a general roll-to-roll coating machine, to ensure the film remains horizontal during the reaction and curing stage. Utilizing a micro-positive pressure assisted air wall method, based on a necked-out air duct structure, it achieves non-contact gas atmosphere creation and component control for the moving membrane structure.

[0144] Preferably, pneumatic valves, gas detection devices, and signal feedback devices are used to achieve automatic detection and gas replenishment within the atmosphere chamber 300, thereby achieving stable control of the gas atmosphere composition.

[0145] As an example, a non-invasive ultraviolet irradiation structure is used, separating the irradiation source from the reaction chamber with a high-transparency quartz glass partition to prevent airflow and heat disturbances from the irradiation source from affecting the curing reaction process. A water-cooling structure is used to maintain a constant temperature in the ultraviolet irradiation and curing areas to avoid the heat generated during the reaction and irradiation processes affecting the curing reaction.

[0146] The protective coating is pretreated by generating static electricity, and the weakly adhesive pre-coating, post-coating, and post-peeling are achieved by adsorption of the second electrostatic agent 903. Static electricity can be generated by using an electrostatic generator such as a corona generator (currently, corona generators are the main method), or by using the principle of triboelectric charging, where a woolen fabric is used to rub the back of the film to generate static electricity.

[0147] Specifically, this application is based on a four-axis linkage uniform irradiation coating system with a multi-roller sinusoidal optical path. The base film device includes a multi-station processing system for the film surface and back side. The roll-to-roll base film is one of porous base film, PET, glass fiber base film or plastic base film.

[0148] More specifically, porous membranes are typically used to provide structural strength while allowing fluids to pass through their pores. PET (polyethylene terephthalate) membranes are a widely used plastic membrane with good mechanical strength, chemical stability, and optical properties. Glass fiber membranes, using glass fibers as a base material, offer excellent insulation, high-temperature resistance, and fire resistance. Besides PET, other types of plastic membranes (such as PVC membranes) may also be used in roll-to-roll processes. PVC membranes offer good flexibility, water resistance, and moisture resistance, making them suitable for packaging, construction, agriculture, and other fields.

[0149] As a specific embodiment, as shown in Figure 14, the coating apparatus 400 employs a self-coupling L-shaped slit double-plate coating blade as described above. It includes a blade head 402, a back plate 401, and a conveying substrate 500. A longitudinal slit for injecting slurry is formed between the back plate 401 and the bottom of the blade head 402; a transverse slit with a length of not less than 0.5 cm is formed between the conveying substrate 500 and the bottom surface of the blade head 402. The longitudinal and transverse slits communicate to form an L-shaped slit. The coating apparatus 400 includes a low-friction inclined conveying substrate 500 and a blade head 402, with the blade head 402 positioned on the inclined conveying substrate 500 for inclined coating.

[0150] In the coating process described above, the slurry is injected through a longitudinal slit between the back plate 401 and the bottom of the cutter head 402. After entering the coupling connection, the slurry is driven by the base film on the transfer substrate 500 and moves along the longitudinal slit. During this movement, the slurry is subjected to shear stress, directly forming a thin film on the base film. The formed thin film moves together with the base film, ultimately completing the coating process.

[0151] Therefore, the L-shaped slit design subjectes the slurry to multiple compressions and constraints during flow, thereby improving coating uniformity and precision. By adjusting the size and shape of the slits, precise control over coating thickness and uniformity can be achieved. This technology can adapt to slurries with different viscosities and solid contents. The transverse slit length is no less than 0.5 cm, providing sufficient flow space for the slurry and making the coating process more stable. The interconnected design of the longitudinal and transverse slits allows the slurry to be rapidly and uniformly coated onto the base film. The driving effect of the base film makes the coating process more continuous and efficient. Precise coating control reduces slurry waste. Waste generated during the coating process can be easily collected and disposed of.

[0152] Preferably, the curing method can be curing with a heat source, electrode, magnetic pole, or light source adapted to the coating device 400. The mention of ultraviolet (UV) curing indicates that the device may utilize UV ​​light to accelerate the curing process of the coating. Specifically, the curing device can be a UV curing device. In this device, the atmosphere chamber 300 and the single-contact curing area of ​​the roll film transport structure adopt a quartz glass composite structure. A water-cooled UV curing lamp 600 is mounted on the quartz glass outside the atmosphere chamber 300. A water-cooled temperature control substrate 700 is provided in the curing area. The water-cooled temperature control substrate 700 is opposite to the water-cooled UV curing lamp 600 and is placed at the bottom of the composite film to remove the heat accumulated on the substrate due to irradiation, preventing the composite film from overheating.

[0153] Furthermore, the heat drying device 800 is installed after the ultraviolet curing device to dry the moisture in the cured composite film, thereby improving product quality.

[0154] Furthermore, referring to Figure 14, the coating device 400 is inclined, and a first support roller 304 and a second support roller 305 are respectively arranged on both sides of the coating device 400. The first support roller 304 is arranged on the side where the composite film enters the atmosphere chamber 300, and the second support roller 305 is arranged between the coating device 400 and the curing device. The height of the first support roller 304 is lower than that of the second support roller 305, so that the composite film is inclined and passes through the transverse slit; the blade 402 performs inclined coating on the composite film; after the inclined coating, the composite film is adjusted to be horizontal after passing through the second support roller 305.

[0155] Specifically, the first support roller 304 is positioned on the side where the composite film enters the atmosphere chamber 300. Its relatively low position provides an initial tilt angle for the composite film. The second support roller 305 is located between the coating unit 400 and the curing unit, and its height is higher than the first support roller 304. This height difference ensures that the composite film maintains an tilted posture during transport and smoothly passes through the transverse slits in the coating unit 400. The cutter head 402, as the core component of the coating unit 400, is responsible for performing the coating operation on the composite film.

[0156] Furthermore, since the composite film is angled, the cutting head 402 is also angled accordingly for coating. This helps ensure uniform distribution of the coating liquid and may improve coating efficiency and quality. After angled coating is completed, the composite film continues to be conveyed forward and passes through the second support roller 305. During this process, the second support roller 305 not only provides support and guidance but also helps adjust the composite film from an angled state to a horizontal arrangement. This adjustment is crucial for subsequent curing processes and the final product quality. Therefore, the angled design of the coating device 400 and the height configuration of the corresponding first support roller 304 and second support roller 305 together constitute a highly efficient and stable coating system. This system not only ensures the stability and uniformity of the composite film during the coating process but also improves production efficiency and product quality.

[0157] Specifically, the supporting membrane uses a membrane material with low surface adhesion, low cost, and high mechanical strength; the friction coefficient between the low-friction inclined transfer substrate 500 and the supporting membrane is less than 0.1, and the inclination angle range is set to 0–60°.

[0158] Optionally, the internal flow channel of the cutter head 402 is provided with a vertical corner, and the slurry is coated onto the base film after being subjected to strong shear stress at the turning point.

[0159] Alternatively, the inlet 302 and outlet 303 of the atmosphere chamber are sealed to the surface of the composite membrane without contact via an air curtain, and the lower surface is sealed with silicone or a flat plate; the upper surface of the area atmosphere chamber 300 is made of high-transparency quartz glass, and a water-cooled ultraviolet curing lamp 600 is installed outside the glass cover made of high-transparency quartz glass; the area transfer substrate 500 is a water-cooled transfer substrate 500 to prevent overheating from irradiation from affecting the temperature of the atmosphere chamber 300; to avoid direct contact that could damage the coated slurry layer, the lower surface is sealed to the base film via an adhesive strip.

[0160] Among them, the water-cooled UV curing lamp 600's regional surface radiation UV light source, through the setting of a horizontal reciprocating motion mechanism, is used to eliminate the problem of uneven irradiation caused by the gaps in the lamp bead array arrangement.

[0161] Among them, the support film peeling roller 901 peels off the cured functional film; the protective film is coated with one of PET, polyethylene or polypropylene film, and a corona machine is used to provide electrostatic adsorption before protective film coating.

[0162] To better understand the technical means of this application and to implement it according to the description, the specific embodiments of this application are described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this application but are not intended to limit its scope.

[0163] Example 12: This application also provides a roll-to-roll double-slit coating production line based on nitrogen atmosphere coupled with ultraviolet curing. This roll-to-roll coating production line combines a nitrogen atmosphere protection system with an ultraviolet curing system. Under a sealed atmosphere, it completes contactless external light source separation ultraviolet curing, and the film material is removed from the protected atmosphere and heated to form a roll through a single-contact exchange system in the transport structure. Simultaneously, it achieves a high-precision and stable coating process by combining right-angle slit tilting coating and a supportive, weak-adhesion pre-protective coating. Specific details are as follows:

[0164] As shown in Figure 15, this embodiment of a roll-to-roll double-slit coating production line based on nitrogen atmosphere coupled ultraviolet light curing includes: a base film device, a pre-protective coating device, a coating device 400, a curing device, a heat drying device 800, and a post-coating device 900. The pre-protective coating device 2, coating device 400, curing device, heat drying device 800, and post-coating device 900 are sequentially installed on the base film device. The coating device 400 is installed in the curing device.

[0165] The curing device in this embodiment is an ultraviolet curing device. Of course, other curing methods can be selected according to other slurries, and the corresponding curing device can be adjusted accordingly.

[0166] In a preferred embodiment of this application, a porous base film is used to transport the base film in a roll-to-roll device. The front protective coating device attaches a support film to the back of the base film by electrostatic adsorption, as shown in Figure 16. Specifically, the support film of the front protective coating device is attached to the back of the base film by generating a first static electricity 201 through a corona generator.

[0167] Further, referring to Figure 17, the composite membrane formed by the base membrane and the support membrane enters the atmosphere chamber 300 through inlet 302. Inlet 302 and outlet 303 specifically adopt a single-contact sealing port, which includes a lower contact base plate 306 and an upper gas curtain 307. The gas discharged from the upper gas curtain 307 is the same gas as that in the atmosphere chamber 300, while other gases are obtained. The atmosphere chamber 300 is filled with vacuum, nitrogen, or other reactive or anti-reactive gases. A gas detection device and a gas valve 301 are installed inside the atmosphere chamber 300 to control the internal atmosphere gas. In the atmosphere chamber 300, the surface slurry is coated and then cured with ultraviolet light sequentially. During the ultraviolet curing stage, the upper surface of the coated membrane is irradiated by a water-cooled ultraviolet curing lamp 600. The atmosphere chamber 300 where the coated membrane is cured is topped with high-transparency quartz glass, and the ultraviolet lamp is installed on the outside of the high-transparency quartz glass. The lower surface of the coated membrane contacts the transfer substrate 500 to ensure stable curing. The transfer substrate 500 is water-cooled to maintain its temperature stability. After coating and curing, the composite film leaves the atmosphere chamber 300 through a single-contact sealing port.

[0168] Furthermore, the atmosphere chamber 300 in this embodiment is highly versatile and flexible, capable of setting constant temperature, humidity, and gas atmosphere conditions according to the needs of the membrane material in the curing stage, and is equipped with corresponding control units. Configurations can be flexibly increased according to actual needs.

[0169] Example 13: Referring to Figure 17, the composite film is coated in an atmosphere chamber 300 using a coating device 400. The transfer substrate 500 is an inclined low-friction substrate, which lifts the surface of the composite film to obtain a certain compressive stress to control the smoothness of the coating process. A blade 402 mounted on the substrate shears and presses the slurry into the surface of the base film, increasing coating stability and reducing surface defects. The microscopic arrangement of the material in the slurry is controlled by adjusting the parameters of the slurry. The coating device 400 in Figure 17 uses the self-coupling L-shaped slit double-plate coating blade shown in Figure 1, with the same structure and function.

[0170] For example, the included angle between the back plate 401 and the conveying base 500 is α, the transition section of the cutter head 402 is chamfered, 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, the viscosity of the scraping coating slurry is η, and the departure angle of the cutter head 402 is γ, and the following conditions are met:

[0171] 15<α<135°; 0°<β<135°; 0≤r ≤ 20 cm; 3μm≤h≤5 mm; 1 cm≤l≤15 cm; 3 mPa·s≤η≤1010 mPa·s; γ≤90°.

[0172] In the above scheme, the included angle α (15° < α < 135°) between the back plate 401 and the transfer substrate 500 provides a wide range of installation angle options for the blade head 402, which helps to adapt to different coating process requirements. The chamfer β (0° < β < 135°) not only optimizes the structure of the blade head 402, but also reduces the friction between the blade and the transfer substrate 500, thereby extending the service life of the blade.

[0173] Precise control of the chamfer radius r (0≤r≤20 cm) ensures a stable coating effect during the scraping process. The precise design of the transverse slit height h (3μm≤h≤5 mm) and length l (1 cm≤l≤15 cm) helps control the paint flow rate and coating width, thereby ensuring the uniformity and consistency of the coating film.

[0174] The viscosity η of the slurry is selected to be 3 mPa·s≤η≤1010 mPa·s, which makes the cutter head 402 suitable for a variety of different types of coatings, including high viscosity and low viscosity coatings.

[0175] The departure angle γ (γ≤90°) of the blade head 402 is designed to help reduce the accumulation of coating on the blade head 402, thereby avoiding coating defects.

[0176] Thanks to the precise design and control of the above parameters, the cutting head 402 can provide a high-quality coating effect with a uniform and consistent coating and few coating defects.

[0177] Furthermore, after the coated film has cured, it undergoes a heat drying stage. Referring to Figure 19, the heat drying device 800 further dries the moisture in the cured composite film to form the final film product. After passing through the heat drying device 800, the support film backing the base film completes its support function and is peeled off from the base film by the support film peeling roller 901.

[0178] Furthermore, a protective coating can be added to the surface of the cured composite film. The protective coating is electrostatically adsorbed onto the surface of the cured composite film using a corona discharge machine, and then wound up to form the final product.

[0179] As an optional solution, the base film device, the front protective film covering device, the coating device 400, the curing device, the hot drying device 800, and the rear film peeling and covering device 900 can all be configured as modular structures, with each modular structure individually or in combination on a cabinet 1000.

[0180] As shown in Figures 16-19, the base film device and the front protective coating device are arranged together as a modular structure; the coating device 400, the curing device, the heat drying device 800, and the rear film peeling and coating device 900 are each a separate modular structure. During movement, the modular structures can be individually disassembled and moved, and can also be spliced ​​and assembled.

[0181] All power units, electrical equipment, cables, and control devices are installed on cabinet 1000. The main film-making process device is placed on top of cabinet 1000, which facilitates operation and avoids interference from cables and other components during film making.

[0182] Each cabinet 1000 is a movable, independent unit that can be combined and assembled as needed. Each cabinet 1000 has a moving part and a locking part at its bottom. The moving part can be casters, and the locking part can be a locking buckle.

[0183] Example 14: Referring to Figures 13 to 19, the fifth objective of this application is to provide a system that employs the above-described roll-to-roll coating film production line; the system is any one of a coating machine, roll-to-roll equipment, curing equipment, and equipment with coating process as the main or secondary structure.

[0184] Example 15: Referring to Figure 13, the sixth objective of this application is to provide a roll-to-roll coating film production method, based on the above-mentioned roll-to-roll coating film production line; the roll-to-roll coating film production method includes:

[0185] S1 provides the base film and the support film;

[0186] S2, the support film is attached to the back of the base film by electrostatic adhesion;

[0187] S3, the composite membrane formed by the base membrane and the support membrane enters the sealed atmosphere chamber 300;

[0188] S4, the coating device 400 coats the composite film that enters the atmosphere chamber 300;

[0189] S5, the curing device cures the coated composite film, and the cured composite film leaves the atmosphere chamber 300.

[0190] S6, heat-bake the cured composite film;

[0191] S7, the composite film is peeled off by the support film peeling roller 901, then electrostatically adsorbed to protect the film coating, and then wound up on the winding roller 904.

[0192] The coating film production method of this application mainly includes providing materials, electrostatic adhesion, entering an atmosphere chamber 300, coating operation, curing treatment, peeling, and winding. First, a base film and a support film are provided. The support film is firmly attached to the back of the base film by electrostatic action. The formed composite film then enters a sealed atmosphere chamber 300 to ensure that the coating process is carried out under specific conditions. The coating apparatus 400 performs precise coating operations on the composite film entering the atmosphere chamber 300. After coating, the curing apparatus cures the composite film, after which the composite film leaves the atmosphere chamber 300. The cured composite film undergoes further heat treatment to enhance its performance. After the support film is peeled off by the support film peeling roller 901, the composite film is protected by electrostatic adsorption and finally wound onto the winding roller 904.

[0193] This method fully leverages the continuous production advantages of roll-to-roll technology, achieving efficient and high-quality coating by precisely controlling the conditions of each step. The introduction of the atmosphere chamber 300 provides a stable environment for the coating and curing processes, ensuring product consistency and stability. Simultaneously, electrostatic adhesion and electrostatic adsorption technologies for protective coatings improve production efficiency and reduce material waste. Heat treatment further enhances the performance of the composite film, enabling it to meet a wider range of application needs.

[0194] In summary, this method not only improves production efficiency but also ensures high product quality. This roll-to-roll coating and film-making production line has advantages such as high efficiency, flexibility, environmental friendliness, high quality, and high degree of automation, and is suitable for coating and film-making processes of various functional films.

[0195] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

[0196]

Claims

1. A self-coupling L-shaped slit double-plate coating doctor blade, characterized in that, include: The cutter head has a slit plate, a side surface and a bottom surface, with a transition section formed between the side surface and the bottom surface, and the slit plate is disposed 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; The transfer substrate and the slit plate form a transverse slit with a length of not less than 0.5 cm. The longitudinal slit and the transverse slit are connected 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 transfer substrate, moves along the longitudinal slit and is directly formed into a film under shear stress.

2. The self-coupling L-shaped slit double-plate coating blade according to claim 1, characterized in that, The angle between the back plate and the conveying substrate is α. A chamfer is provided in the transition section, with an arc of β. The radius of the chamfer is r. The height of the transverse slit is h, and the length of the transverse slit is l. The viscosity of the scraping slurry is η, and the departure angle of the blade is γ, satisfying the following: 15<α<135°;0°<β<135°;0≤r≤ 20cm;3μm≤h≤5 mm;1 cm≤l≤15 cm;3 mPa·s≤η≤10 10 mPa·s;γ≤90°。 3. The self-coupling L-shaped slit double-plate coating blade according to claim 1, characterized in that, The longitudinal slit is a parallel slit or a V-shaped slit; the transverse slit is a parallel slit composed of two parallel plates or a curved slit composed of hyperbolic plates. The V-shaped slit is a buffer-type slit that is wider at the top and narrower at the bottom; the hyperboloid panels have the same shape, and the V-shaped slit is wider at the top and narrower at the bottom, sealed on all sides, with an opening at the top and a slit at the bottom, forming an overall inverted triangular prism structure. 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 plate with high flatness and low roughness.

4. 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 delivery substrate is coupled with a motion base membrane system.

5. 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 linear bearings. The lower plate is fixed between the bottoms of two opposite side plates; the two side plates are fixed together to the bottom of the upper plate; the cutter head is connected to the back plate through linear bearings at both ends of the upper plate.

6. The self-coupling L-shaped slit double-plate coating blade according to claim 5, characterized in that, The backplate includes a conveying base, a slot adjustment component, a slot plate, a fixed optical axis, a micrometer head, and a pressure spring; The linear bearing is connected to the slot adjustment component of the back plate; The slot adjustment component is fixed to the conveying base and its lateral position is adjusted through the holes on the conveying base. The slot plate and the fixed optical axis are fixed to the slot adjustment component. A micrometer is connected to the top of the fixed optical axis to control the height of the upper plate. The pressure spring is installed on the fixed optical axis to provide resistance for fixing the upper plate.

7. The self-coupling L-shaped slit double-plate coating blade according to claim 1, characterized in that, The cutter head comprises n, where n≥2, arranged side by side with their bottoms on the same surface. The n cutter heads are sequentially coupled and connected to the n transverse slits formed by the conveying substrate. The first cutter head forms a first longitudinal slit with the back plate, and the nth cutter head forms an nth longitudinal slit with the sidewall of the (n-1)th cutter head, forming a total of n longitudinal slits. The same or different types of slurry are added to the n longitudinal slits.

8. 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 to solidify the slurry and form a semi-wet film.

9. A system for slurry coating using a self-coupling L-shaped slit double-plate coating doctor blade as described in any one of claims 1 to 8, characterized in that, The system is any one of a slit roll-to-roll device, a printing device, and a device with slit coating.

10. A coating method, characterized in that, A self-coupling L-shaped slit double-plate coating blade according to any one of claims 1 to 7; the coating method includes: Inject the slurry into the longitudinal slit; After the slurry enters the coupling connection, it is driven by the base film arranged on the conveying substrate to move along the longitudinal slit. During the process, the slurry is subjected to shear stress and forms a film directly on the base film.

11. A roll-to-roll coating and film-making production line, characterized in that, include: Base membrane device, the base membrane device providing a base membrane; A front protective film covering device, wherein the front protective film covering device provides a support film; The base film is adsorbed onto the supporting film to form a composite film; An atmosphere chamber, in which the composite membrane enters a sealed atmosphere chamber; A coating apparatus, which is disposed in the atmosphere chamber, is used to coat the composite film that enters the atmosphere chamber; A curing device is used to cure the coated composite film, and the cured composite film leaves the atmosphere chamber. A heat drying device is used to heat dry the composite film after it has been cured. The post-peeling film coating device includes a support film peeling roller, a protective film coating roller, and a take-up roller. The composite film is peeled off by the support film peeling roller, then the protective film is adsorbed and coated, and then wound up on the take-up roller. The coating apparatus includes a blade, a back plate, and a conveying substrate. A longitudinal slit for injecting slurry is formed between the back plate and the bottom of the blade; a transverse slit is formed between the conveying substrate and the bottom surface of the blade, and the longitudinal and transverse slits communicate to form an L-shaped slit; the included angle between the back plate and the conveying substrate is α; the transition section of the blade is chamfered with an arc of β; the radius of the chamfer is r; the height of the transverse slit is h; and the length of the transverse slit is l; the viscosity of the coating slurry is η; and the departure angle of the blade is γ, satisfying the following: 15°<α<135°; 0°<β<135°; 0≤r ≤ 20 cm; 3μm≤h≤5 mm; 1 cm≤l≤15 cm; 3 mPa·s≤η≤1010 mPa·s; γ≤90°.

12. A roll-to-roll coating and film-making production line according to claim 11, characterized in that, The coating device is inclined, and a first support roller and a second support roller are respectively arranged on both sides of the coating device. The first support roller is arranged on the side where the composite film enters the atmosphere chamber, and the second support roller is arranged between the coating device and the curing device. The height of the first support roller is lower than that of the second support roller, so that the composite film is inclined and passes through the transverse slit. The blade performs inclined coating on the composite film. After the inclined coating, the composite film is adjusted to be horizontal after passing through the second support roller.

13. A roll-to-roll coating and film-making production line according to claim 12, characterized in that, The coefficient of friction between the transmission substrate and the support membrane is less than 0.1, and the tilt angle of the transmission substrate is 0 to 60°.

14. A roll-to-roll coating and film-making production line according to claim 10, characterized in that, The curing device is an ultraviolet curing device; The ultraviolet curing device includes a water-cooled ultraviolet curing lamp and a water-cooled temperature control substrate. The water-cooled ultraviolet curing lamp is installed above the quartz glass outside the atmosphere chamber, and the light from the water-cooled ultraviolet curing lamp shines on the base film surface of the composite film. The water-cooled temperature control substrate is opposite to the water-cooled ultraviolet curing lamp and is placed at the bottom of the composite film.

15. A roll-to-roll coating and film-making production line according to claim 14, characterized in that, The water-cooled ultraviolet curing lamp is a regional surface radiation light source, and the water-cooled ultraviolet curing lamp is equipped with a horizontal reciprocating motion mechanism.

16. A roll-to-roll coating and film-making production line according to claim 11, characterized in that, The inlet and outlet of the atmosphere chamber are sealed to the surface of the composite membrane without contact through an air curtain, and the inlet and outlet of the atmosphere chamber are sealed to the lower surface of the composite membrane. The atmosphere chamber is equipped with a gas valve for controlling the gas concentration inside the atmosphere chamber; Both the inlet and outlet adopt a single-contact sealing port, which includes a lower contact base plate and an upper gas curtain. The gas discharged from the upper gas curtain is the same as the gas in the atmosphere chamber.

17. A roll-to-roll coating and film-making production line according to claim 11, characterized in that, The base film device, front protective film covering device, coating device, curing device, hot drying device, and rear film peeling and covering device are all modular structures. Each modular structure is set up separately on a cabinet, or multiple modular structures are combined and set up together on a cabinet.

18. A coating machine, characterized in that, The roll-to-roll coating and film-making production line according to any one of claims 11 to 17 is adopted.

19. A roll-to-roll device, characterized in that, The roll-to-roll coating and film-making production line according to any one of claims 11 to 17 is adopted.

20. A curing device, characterized in that, The roll-to-roll coating and film-making production line according to any one of claims 11 to 17 is adopted.

21. An apparatus whose primary or secondary structure is coating process, characterized in that, The roll-to-roll coating and film-making production line according to any one of claims 11 to 17 is adopted.

22. A roll-to-roll coating film production method, characterized in that, A roll-to-roll coating film production line according to any one of claims 11 to 17; the roll-to-roll coating film production method includes: Provide base film and support film; The support membrane is adsorbed onto the back of the base membrane; The composite membrane formed by the base membrane and the support membrane enters a sealed atmosphere environment; The composite membrane entering the atmospheric environment is coated; The coated composite film is then cured. The composite film after curing is subjected to heat drying treatment; After the supporting film is peeled off, the composite film is then coated with a protective film and finally rolled up.

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