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

Abstract

The present application discloses a roll-to-roll coating film production line, system and method, which relates to the field of coating technology. The production line includes: a base film device, a front protective film coating device, a coating device, a curing device, a heat drying device, and a rear film peeling and coating device; the support film is attached to the back of the base film by electrostatic adhesion; the composite film formed by the base film and the support film enters a sealed atmosphere box; the coating device is arranged in the atmosphere box, and is used to coat the composite film entering the atmosphere box; the curing device performs a curing treatment on the coated composite film, and the composite film after the curing treatment leaves the atmosphere box; the heat drying device is used to perform a heat drying treatment on the composite film after the curing treatment; the rear film peeling and coating device includes a support film stripping roller, a protective film coating roller and a winding roller, and the composite film is stripped of the support film by the support film stripping roller, and then the protective film is electrostatically adsorbed and wound on the winding roller. The device realizes high-precision and stable coating of air-sensitive slurry and non-invasive curing film-making process.

Description

Technical Field

[0001] The present application relates to the field of coating technology, and in particular to a roll-to-roll coating film production line, system and method. Background Art

[0002] With the rapid development of new energy material technology, coating technologies used in traditional printing, packaging, plastics and other industries are gradually shifting to new industries such as fuel cells, hydrogen production, energy storage, lithium batteries, solar photovoltaics, and environmental water treatment, which put forward higher precision, newer technology, and faster iteration requirements for coating technology. Traditional "roll-to-roll" coating technology has the advantages of high efficiency and large-scale production. However, the coating heads commonly used in traditional coating equipment are simple in design and poor in precision, which makes 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 single functions, usually including only a few processes such as unwinding, coating, solvent thermal volatilization curing, and winding. The above processes can usually only complete the coating of traditional membrane material slurry and the preparation of traditional membrane materials.

[0003] In addition, the traditional roll-to-roll coating film production line can only post-process the coating layer in an air environment. However, the rapidly developing film industry has introduced many environmentally sensitive slurries, such as anaerobic, moisture-free, or special gas atmosphere requirements. Generally, the coated slurry and the cured coating cannot withstand forces such as scraping, rubbing, and pressing, otherwise it will cause coating defects, peeling, or changes in the micro-nano structure of the coating. However, the film material of the roll-to-roll production line is in a state of continuous transmission. If the traditional line sealing and surface sealing strategies are adopted, it is inevitable to damage the coating. To address this problem, the conventional practice is to encapsulate the entire roll-to-roll production line in a factory with a specific environmental atmosphere, which leads to extremely high technical difficulty (the sealing technology of the entire factory is difficult), manufacturing cost (the sealing structure of the entire factory is expensive) and operating cost (the entire factory needs to consume a large amount of pure gas to replace the air for a single start-up). In addition, the anaerobic, moisture-free, or special gas atmosphere of the entire factory will inevitably make it impossible for personnel to enter the factory to operate the roll-to-roll device. Special "space suit-like" equipment is required to enter.

[0004] Emerging thin film materials have more demanding, complex and diverse requirements for processing technology. For example: the slurry coating accuracy and scraping force application method are more complex; specific atmosphere protection (such as inert gas, specific temperature and humidity) is required during the slurry coating process; it is required to provide atmosphere protection that meets the process requirements without damaging the coating; the film material is required to maintain a constant temperature, humidity and gas atmosphere during the curing section; it is required to input the inducing factors used for curing and film making non-invasively; and there are specific requirements for the selection of the substrate and the addition of protective coatings. Traditional roll-to-roll coating technology with single function, low coating accuracy and single curing conditions is difficult to meet the market's diversified process and precision requirements for emerging coating film materials. In the context of reducing costs, reducing labor dependence, and promoting intelligent and large-scale production in the new energy industry, "roll-to-roll" coating equipment needs to develop in the direction of precision, continuity, customization and multi-function. Summary of the invention

[0005] In order to overcome the shortcomings of the existing slit coating technology, the present application provides a roll-to-roll coating film production line, system and method. The roll-to-roll coating film production line combines the atmosphere protection and curing system, and completes contactless atmosphere sealing protection and contactless external light source separated ultraviolet light curing under the roll-to-roll operation process, and through the single-contact exchange system of the transport structure, the film material leaves the atmosphere protection and is hot-dried to form a roll, thereby realizing a high-precision and stabilized coating process.

[0006] The first object of the present application is to provide a roll-to-roll coating film production line, comprising:

[0007] A base film device, the base film device providing a base film; the base film device comprising a base film roller for winding the base film;

[0008] A front protective coating device, wherein the front protective coating device provides a support film; the base film is adsorbed on the support film to form a composite film; the front protective coating device comprises a support film roller for winding the support film;

[0009] An atmosphere box, wherein the composite film formed by the base film adsorbing the support film enters the sealed atmosphere box;

[0010] A coating device, the coating device is arranged in the atmosphere box, and is used to coat the composite film entering the atmosphere box;

[0011] A curing device, wherein the curing device performs a curing treatment on the coated composite film, and the composite film after the curing treatment leaves the atmosphere box;

[0012] A heat drying device, used for performing heat drying on the composite film after curing;

[0013] The rear film peeling and laminating device comprises a supporting film stripping roller, a protective film laminating roller and a winding roller. The composite film is stripped of the supporting film by the supporting film stripping roller, and then the protective film is adsorbed and rolled up on the winding roller.

[0014] As a further improvement of the present application, the coating device includes a coating head, a back plate and a coating base, a longitudinal slit for injecting slurry is formed between the back plate and the bottom of the coating head; a transverse slit with a length of not less than 0.5 cm is formed between the coating base and the bottom surface of the coating head, and the longitudinal slit is connected with the transverse slit to form an L-shaped slit.

[0015] As a further improvement of the present application, the coating device is arranged at an angle, 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 box, and the second support roller is arranged between the coating device and the curing device, and the height of the first support roller is lower than that of the second support roller, so that the composite film is arranged at an angle and passes through the transverse slit; the coating head performs oblique coating on the composite film; and the composite film after oblique coating is adjusted to a horizontal arrangement after passing through the second support roller.

[0016] As a further improvement of the present application, the L-shaped slit in the internal flow channel of the coating head is provided with a vertical turning corner, and a strong shear stress is applied to the slurry at the turning corner before the slurry is coated on the base film.

[0017] As a further improvement of the present application, the friction coefficients of the coated substrate and the support film are both less than 0.1, and the inclination angle of the coated substrate is 0 to 60°.

[0018] As a further improvement of the present application, the curing device is a UV curing device;

[0019] The ultraviolet light 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 box, and the light of the water-cooled ultraviolet curing lamp is irradiated toward 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.

[0020] As a further improvement of the present application, the water-cooled ultraviolet curing lamp is a regional surface radiation light source, and the water-cooled ultraviolet curing lamp is provided with a horizontal reciprocating motion mechanism.

[0021] As a further improvement of the present application, the inlet and outlet of the atmosphere box are both contact-sealed with the surface of the composite membrane via an air curtain, and the inlet and outlet of the atmosphere box are both contact-sealed with the lower surface of the composite membrane.

[0022] As a further improvement of the present application, a gas valve for controlling the gas concentration inside the atmosphere box is provided inside the atmosphere box.

[0023] As a further improvement of the present application, the adsorption is electrostatic adsorption, and the static electricity is obtained by a classical generator or friction.

[0024] As a further improvement of the present application, the inlet and the outlet both adopt a single contact sealing port, and the single contact sealing port includes a lower contact bottom plate and an upper gas air curtain, and the gas discharged by the upper gas air curtain is the same as the gas in the atmosphere box.

[0025] As a further improvement of the present application, the base film device, front protective coating device, coating device, curing device, heat drying device and rear film peeling and coating device are all modular structures, each modular structure is individually arranged on a cabinet, or multiple modular structures are combined and arranged together on a cabinet.

[0026] The second purpose of the present application is to provide a system that adopts the roll-to-roll coating film production line; the system is any one of a coater, a roll-to-roll device, a curing device, and a device with a coating process as the main or secondary structure.

[0027] The third object of the present application is to provide a roll-to-roll coating film production method, based on the roll-to-roll coating film production line; the roll-to-roll coating film production method comprises:

[0028] Providing a base film and a support film;

[0029] The support film is adsorbed on the back of the base film;

[0030] The composite film formed by the base film and the support film enters a sealed atmosphere;

[0031] coating the composite film entering the atmosphere;

[0032] Performing a curing treatment on the coated composite film;

[0033] Performing heat baking treatment on the composite film after curing treatment;

[0034] After the composite film is peeled off from the supporting film, it is then adsorbed onto the protective covering film and finally rolled up.

[0035] Compared with the prior art, the beneficial effects of this application are:

[0036] The device of the present application includes a base film device, a front protective coating device, a coating device, an ultraviolet light curing device, a heat drying device and a rear film peeling and coating device; the base film device includes a base film roller for winding and providing a base film. The base film is the basic material for the coating operation. The front protective coating device includes a support film roller for winding a support film. The support film is adsorbed on the back of the base film to form a composite film. This composite structure helps to maintain the flatness and stability of the base film during the coating process. The coating device is arranged in a sealed atmosphere box to perform a coating operation on the composite film entering the atmosphere box. The curing device performs a curing treatment on the coated composite film. The heat drying device is used to perform a further heat drying treatment on the composite film after the curing treatment. This helps to ensure that the coating is completely cured and improve the overall performance and stability of the film. The composite film passes through the support film stripping roller to strip off the support film. Then, a new composite structure is formed by adsorbing the protective coating. Finally, this new composite film is rolled up on the winding roller to complete the entire coating and film making process.

[0037] The base film device realizes continuous production and greatly improves production efficiency. The use of support film helps to maintain the flatness of the base film, thereby improving the coating quality. The device can adapt to different types of base films and coating materials. There are various curing methods, and the most suitable curing method can be selected according to the different coating materials. UV curing is an environmentally friendly curing method that does not produce harmful waste gas or wastewater. Adsorption technology ensures a close fit between the support film and the protective film, avoiding bubbles and wrinkles during the coating process. Curing treatment and heat baking treatment help to improve the overall performance and stability of the film, making it have better durability and service life. The entire device can achieve automated production, reduce manual intervention, and improve production efficiency and product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the roll-to-roll coating process of the present application;

[0039] Figure 2 yes Figure 1 An enlarged schematic diagram of the atmosphere box in FIG.

[0040] Figure 3 This is a schematic diagram of the structure of the roll-to-roll double-slit coating production line of the present application;

[0041] Figure 4 It is a schematic diagram of the structure of the protective film laminating roller before the present application;

[0042] Figure 5 It is a schematic diagram of the structure of the coating device of the present application;

[0043] Figure 6 It is a schematic diagram of the structure of the ultraviolet curing device of the present application;

[0044] Figure 7It is a schematic diagram of the structure of the heat drying device and the rear film peeling and laminating device of the present application.

[0045] Among them, 100, base film roller; 101, upper roller; 200, support film roller; 201, first electrostatic; 202, lower roller; 300, atmosphere box; 301, gas valve; 302, inlet; 303, outlet; 304, first support roller; 305, second support roller; 306, lower contact bottom plate; 307, upper gas wind curtain; 400, coating device; 401, back plate; 402, coating head; 500, coating substrate; 600, water-cooled UV curing lamp; 700, water-cooled temperature-controlled substrate; 800, hot baking device; 900, rear film peeling and laminating device; 901, support film peeling roller; 902, protective film laminating roller; 903, second electrostatic; 904, winding roller; 1000, cabinet. DETAILED DESCRIPTION

[0046] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0047] In this application, the term "and / or" describes the association relationship of associated objects, indicating that there may be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. A and B can be singular or plural. The character " / " generally indicates that the associated objects are in an "or" relationship.

[0048] In this application, "at least one" means one or more, and "plurality" means two or more. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, "at least one of a, b, or c", or "at least one of a, b, and c" can all mean: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, and c can be single or multiple.

[0049] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution, some or all of the steps can be executed in parallel or sequentially, and the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0050] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "an", "the" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0051] The weight of the relevant components mentioned in the embodiment description of the present application can not only refer to the specific content of each component, but also indicate the proportional relationship between the weights of the components. Therefore, as long as the content of the relevant components is proportionally enlarged or reduced according to the embodiment description of the present application, it is within the scope disclosed in the embodiment description of the present application. Specifically, the mass in the embodiment description of the present application can be a mass unit known in the chemical industry such as µg, mg, g, kg, etc.

[0052] The terms "first" and "second" are used only for descriptive purposes to distinguish objects such as substances from each other, and should not be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. For example, without departing from the scope of the embodiments of the present application, the first XX may also be referred to as the second XX, and similarly, the second XX may also be referred to as the first XX. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0053] like Figure 1 As shown, the first object of the present application is to provide a roll-to-roll coating film production line, including: a base film device, a front protective film laminating device, a coating device 400, a curing device, a heat drying device 800 and a rear film peeling and laminating device 900;

[0054] Among them, 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, and the support film is adsorbed on the back of the base film; the composite film formed by the base film and the support film enters the sealed atmosphere box 300; the coating device 400 is arranged in the atmosphere box 300, and is used to coat the composite film entering the atmosphere box 300; the curing device cures the coated composite film; the composite film after curing leaves the atmosphere box 300; the heat drying device 800 is used to heat dry the composite film after curing; the rear film peeling and coating device 900 includes a support film stripping roller 901, a protective film coating roller 902 and a winding roller 904, the composite film passes through the support film stripping roller 901 to strip the support film, and then adsorbs the protective coating and is wound on the winding roller 904.

[0055] Furthermore, the front protective film coating device is connected to the coating device 400, and the coating device 400 is externally provided with a curing device, and is sequentially connected to the heat drying device 800 and the rear film peeling and coating device 900 according to the process requirements. The front protective film coating device makes a layer of low-viscosity easy-to-peel film for temporary support attached to the back of the base film, and the device contains an electrostatic generator, which generates a first static electricity 201 to enhance the bonding force of the protective film.

[0056] As an example, Figure 2 As shown, the coating device 400 is provided with a low-friction, inclined coating substrate 500 to provide coating compressive stress and supporting force, and the coating head 402 is designed as a right-angle slit coating head 402 installed on the inclined coating substrate 500 platform for inclined coating; the curing device includes a quartz glass composite atmosphere box 300, an external water-cooled ultraviolet curing lamp 600 and a water-cooled temperature control substrate 700, and the connection between the atmosphere box 300 and the roll-to-roll film transport structure is a single-sided contact structure with a back silicone sealing contact and a front wind knife seal; the area covered by the water-cooled ultraviolet curing lamp 600 is set as quartz glass with high ultraviolet transmittance, and the ultraviolet irradiation area is set as a water-cooled temperature control substrate 700 to prevent long-term ultraviolet irradiation from causing excessive temperature; the heat drying device 800 is arranged after the curing device to further heat dry the cured composite film to remove moisture; the rear film peeling and laminating device 900 includes a support film peeling roller 901, a protective film laminating roller 902 and a winding roller 904.

[0057] As a further improvement, atmosphere-coupled UV curing keeps the slurry in an atmosphere-protected state throughout the entire process from feeding to coating and curing to film formation, and the externally coupled UV curing system reduces the difficulty of temperature control in the atmosphere; the coating device 400 makes the base film fit tightly, and the coating head 402 makes the slurry in a shear stress / compression stress composite force field to be coated on the base film surface to optimize film forming accuracy and stability; the front-covering and back-uncovering support film expands the actual coated base film, so that the coating can be applied to porous base films, low-support, low-mechanical-strength membranes and other substrates that were originally difficult to coat; more importantly, in the air curtain contactless sealing solution, the single-contact nitrogen atmosphere material exchange prevents scratch defects caused by contact on the membrane surface while ensuring that the concentration of the atmosphere (such as different gas atmospheres such as nitrogen, argon, and vacuum atmosphere) remains unchanged; the covering of the protective film effectively improves the storage capacity and stability of the functional membrane material roll.

[0058] Further, see Figure 1 The base film and the support film are extruded and bonded between the upper roller 101 and the lower roller 202 to form a composite film, and the composite film enters the atmosphere box 300.

[0059] Based on the general roll-to-roll film coating process device, this application proposes a double-slit coating process on an inclined plane to ensure that the film is in a horizontal state during the reaction and curing stage. The method of using a micro-positive pressure auxiliary wind wall and based on a necked airway structure, non-contact gas atmosphere creation and component control for a moving membrane structure are achieved.

[0060] Preferably, a pneumatic valve, a gas detection device, and a signal feedback device are used to realize automatic detection and gas replenishment in the atmosphere box 300, so as to realize stable control of the gas atmosphere composition.

[0061] As an example, a non-invasive UV irradiation structure is used to separate the irradiation source from the reaction chamber, separated by highly transparent quartz glass in the middle to prevent the airflow and heat disturbance of the irradiation source from affecting the curing reaction process. A water-cooling structure is used to control the temperature of the UV irradiation and curing area to prevent the heat generated during the reaction and irradiation process from affecting the curing reaction.

[0062] The protective film is pre-treated by generating static electricity, and the weak adhesion pre-filming, post-filming and post-filming are adsorbed by the second static electricity 903. For example, static electricity is generated by using an electrostatic generator such as a corona machine. Currently, a corona machine is mainly used to generate static electricity. The principle of friction electrification can also be used to use wool fabric to frictionally electrify the back of the film.

[0063] Specifically, the present application is a four-axis linkage uniform irradiation coating system based on a multi-roller sinusoidal light 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 a porous base film, PET, a glass fiber base film or a plastic base film.

[0064] More specifically, porous base films are often used to support and provide structural strength while allowing fluids to pass through their pores. PET (polyethylene terephthalate) base film is a widely used plastic base film with good mechanical strength, chemical stability, and optical properties. Glass fiber base film uses glass fiber as a substrate and has excellent insulation, high temperature resistance, and fire resistance. In addition to PET, other types of plastic base films (such as PVC film) may also be used in roll-to-roll processes. PVC film has good flexibility, waterproofness, and moisture resistance, and is suitable for packaging, construction, agriculture, and other fields.

[0065] As a specific plan, Figure 2 As shown, the coating device 400 includes a coating head 402, a back plate 401 and a coating substrate 500, a longitudinal slit for injecting slurry is formed between the back plate 401 and the bottom of the coating head 402; a transverse slit with a length of not less than 0.5 cm is formed between the coating substrate 500 and the bottom surface of the coating head 402, and the longitudinal slit and the transverse slit are connected to form an L-shaped slit. The coating device 400 includes a low-friction inclined coating substrate 500 and a coating head 402, and the coating head 402 is arranged on the inclined coating substrate 500 for inclined coating.

[0066] During the coating process of the above scheme, the slurry is injected from the longitudinal slit between the back plate 401 and the bottom of the coating head 402. After the slurry enters the coupling connection, it is driven by the base film on the coating substrate 500 and moves along the longitudinal slit. During the movement, the slurry is subjected to shear stress and forms a thin film directly on the base film. The formed thin film moves with the base film, and finally the coating process is completed.

[0067] Therefore, the design of the L-shaped slit causes the slurry to be squeezed and restricted multiple times during the flow process, thereby improving the uniformity and accuracy of the coating. By adjusting the size and shape of the slit, the thickness and uniformity of the coating layer can be accurately controlled. This technical solution can adapt to slurries with different viscosities and solid contents. The length of the transverse slit is not less than 0.5 cm, which provides sufficient flow space for the slurry and makes the coating process more stable. The connection design between the longitudinal slit and the transverse slit allows the slurry to be quickly and evenly coated on the base film. The driving effect of the base film makes the coating process more continuous and efficient. Accurate coating control reduces the waste of slurry. The waste generated during the coating process can be easily collected and processed.

[0068] Preferably, the curing method may be a heat source, electrode, magnetic pole or light source curing that is compatible with the coating device 400. Ultraviolet light curing is mentioned here, indicating that the device may use ultraviolet light to accelerate the curing process of the coating. The curing device may specifically be an ultraviolet light curing device, in which the atmosphere box 300 and the single contact and curing area of ​​the roll film transport structure adopt a quartz glass composite structure, the water-cooled ultraviolet curing lamp 600 is installed on the quartz glass outside the atmosphere box 300, and the curing area is provided with a water-cooled temperature-controlled substrate 700; the water-cooled temperature-controlled substrate 700 is opposite to the water-cooled ultraviolet curing lamp 600 and is placed at the bottom of the composite film to take away the heat accumulated by the substrate due to irradiation to prevent the composite film from overheating.

[0069] Furthermore, the heat drying device 800 is arranged after the ultraviolet light curing device to dry the moisture of the cured composite film to improve the product quality.

[0070] Furthermore, combined with Figure 2 The coating device 400 is tilted, and the first support roller 304 and the 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 box 300, and the second support roller 305 is arranged between the coating device 400 and the curing device, and the height of the first support roller 304 is lower than the second support roller 305, so that the composite film is tilted and passes through the transverse slit; the coating head 402 performs tilted coating on the composite film; the composite film after tilted coating passes through the second support roller 305 and is adjusted to a horizontal arrangement.

[0071] Specifically, the first support roller 304 is arranged on the side where the composite film enters the atmosphere box 300. It is relatively low, providing a starting tilt angle for the composite film. The second support roller 305 is located between the coating device 400 and the curing device, and its height is higher than the first support roller 304. Such a height difference ensures that the composite film can maintain an inclined posture during the transmission process and smoothly pass through the transverse slit in the coating device 400. The coating head 402, as the core component of the coating device 400, is responsible for coating the composite film.

[0072] Further, since the composite film is arranged at an angle, the coating head 402 is also coated at an angle accordingly, which helps to ensure the uniform distribution of the coating liquid and may improve the coating efficiency and quality. After the inclined coating is completed, the composite film continues to be transmitted forward and passes through the second support roller 305. In this process, the second support roller 305 not only plays a supporting and guiding role, but also helps the composite film to be adjusted from an inclined state to a horizontal arrangement. This adjustment is crucial for subsequent curing treatment and the final quality of the finished product. Therefore, the inclined design of the coating device 400 and the height configuration of the first support roller 304 and the second support roller 305 matched therewith together constitute an efficient and stable coating system. This system can not only ensure the stability and uniformity of the composite film during the coating process, but also improve production efficiency and product quality.

[0073] As a specific solution, the support film uses a film material with low surface adhesion, low cost and high mechanical strength; the friction coefficient between the low-friction inclined coating substrate 500 and the support film is less than 0.1, and the inclination angle range is set to 0 to 60°.

[0074] Optionally, a vertical corner is set in the internal flow channel of the coating head 402, and a strong shear stress is applied to the slurry at the turning point before it is coated on the base film.

[0075] Further optionally, the inlet 302 and the outlet 303 of the atmosphere box are both contactlessly sealed with the surface of the composite membrane by an air curtain, and the lower surface is sealed by silicone or a flat plate; the upper surface of the regional atmosphere box 300 is set to high-transmittance quartz glass, and a water-cooled ultraviolet curing lamp 600 is installed outside the glass cover made of high-transmittance quartz glass, and the regional coating substrate 500 is a water-cooled coating substrate 500 to prevent the temperature of the atmosphere box 300 from being affected by overheating caused by radiation; to avoid direct contact and damage to the coated slurry layer, the lower surface is sealed in contact with the base film by a rubber strip.

[0076] The water-cooled ultraviolet curing lamp 600 is a regional surface radiating ultraviolet light source, and a horizontal reciprocating motion mechanism is provided to eliminate the problem of uneven irradiation caused by the gaps in the arrangement of the lamp beads array.

[0077] Among them, the support film peeling roller 901 is peeled off on the cured functional film; the protective film is coated with one of PET, polyethylene, and polypropylene films, and a corona machine is used to provide electrostatic adsorption before the protective coating.

[0078] In order to more clearly understand the technical means of the present application and implement them according to the contents of the specification, the specific implementation methods of the present application are further described in detail below in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the present application but are not used to limit the scope of the present application.

[0079] Example 1

[0080] The present application also provides a roll-to-roll double-slit coating production line based on nitrogen atmosphere coupled UV curing. The roll-to-roll coating film production line combines nitrogen atmosphere protection with UV curing system, completes contactless external light source separated UV curing under the state of atmosphere sealing protection, and makes the film material leave the atmosphere protection and heat-dry after rolling through the single contact exchange system of the transport structure; at the same time, by combining right-angle slit tilted coating and supporting weak adhesion pre-protection coating, a high-precision and stable coating process is achieved. The specific description is as follows:

[0081] See Figure 3 As shown, a roll-to-roll double-slit coating production line based on nitrogen atmosphere coupled UV curing in this embodiment includes: a base film device, a front protective film coating device, a coating device 400, a curing device, a heat drying device 800, and a rear film peeling and laminating device 900. The front protective film coating device 2, the coating device 400, the curing device, the heat drying device 800, and the rear film peeling and laminating device 900 are sequentially installed on the base film device. The coating device 400 is installed in the curing device.

[0082] The curing device of 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 adaptively adjusted.

[0083] As a preferred embodiment of the present application, a porous base film is used to transport the base film for a roll-to-roll device, and the front protective film coating device adheres the support film to the back of the base film by electrostatic adsorption, see the attached Figure 4 Specifically, the support film of the front protective coating device is attached to the back of the base film by generating the first static electricity 201 through the corona machine.

[0084] For further information, see Appendix Figure 5, the composite film formed by the base film and the support film enters the atmosphere box 300 through the inlet 302. The inlet 302 and the outlet 303 specifically adopt a single contact sealing port. The single contact sealing port includes a lower contact bottom plate 306 and an upper gas air curtain 307. The upper gas air curtain 307 exhausts the same gas as the atmosphere box 300 to obtain other gases. The interior of the atmosphere box 300 is vacuum, nitrogen or other reactive gas or anti-reactive gas. A gas detection device and a gas valve 301 are arranged inside the atmosphere box 300 to control the internal atmosphere gas. The surface slurry coating and ultraviolet light curing are carried out in sequence in the atmosphere box 300. In the ultraviolet light curing stage, the upper surface of the coating film is illuminated by a water-cooled ultraviolet curing lamp 600. The top of the atmosphere box 300 where the coating film is cured is a high-transmittance quartz glass, and the ultraviolet lamp is installed on the outside of the high-transmittance quartz glass; the lower surface of the coating film contacts the coating substrate 500 to ensure stable curing. The coating substrate 500 is a water-cooled coating substrate 500 to maintain its temperature stability. After coating and curing, the composite film leaves the atmosphere box 300 through a single contact sealing port.

[0085] Furthermore, the atmosphere box 300 of this embodiment has high diversity and flexibility, and can set constant temperature, humidity, gas atmosphere and other conditions according to the needs of the film material in the curing stage, and is equipped with a corresponding control unit. The configuration can be flexibly increased according to actual needs.

[0086] Example 2

[0087] See attached Figure 5 The composite film is coated by a coating device 400 in an atmosphere box 300. The coating substrate 500 is an inclined low-friction substrate. The substrate lifts the surface of the composite film to obtain a certain compressive stress to control the flatness of the coating process. The coating head 402 installed on the substrate shears and presses the slurry into the surface of the base film to increase the coating stability and reduce surface defects. The microscopic arrangement state of the material in the slurry is regulated by controlling the parameters of the slurry.

[0088] For example, the angle between the back plate 401 and the coating substrate 500 is α, the transition section of the coating head 402 is chamfered, the arc of the chamfer is 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 coating slurry viscosity η, the departure angle γ of the coating head 402, and satisfy:

[0089] 15<α<135°; 0°<β<135°; 0≤r ≤ 20 cm; 3μm≤h≤5 mm; 1 cm≤l≤15 cm; 3mPa·s≤η≤1010 mPa·s; γ≤90°.

[0090] In the above solution, the angle α (15°<α<135°) between the back plate 401 and the coating substrate 500 provides a wide range of installation angles for the coating head 402, which helps to adapt to different coating process requirements. The arc design of the chamfer β (0°<β<135°) not only optimizes the structure of the coating head 402, but also reduces the friction between the scraper and the coating substrate 500, thereby extending the service life of the scraper.

[0091] The precise control of the chamfer radius r (0≤r≤20 cm) enables the scraper to maintain a stable scraping effect during the scraping process. The precise design of the height h (3μm≤h≤5 mm) and length l (1 cm≤l≤15 cm) of the transverse slit helps control the flow rate and coating width of the coating, thereby ensuring the uniformity and consistency of the coating film.

[0092] The viscosity η of the slurry is selected to be 3 mPa·s≤η≤1010 mPa·s, so that the coating head 402 can be applicable to a variety of different types of coatings, including high-viscosity and low-viscosity coatings.

[0093] The departure angle γ (γ≤90°) design of the coating head 402 helps to reduce the accumulation of coating on the coating head 402, thereby avoiding the occurrence of coating defects.

[0094] Due to the precise design and control of the above parameters, the coating head 402 can provide high-quality coating effects, with uniform and consistent coating films and few coating defects.

[0095] Furthermore, the coating film undergoes a heat-baking stage after curing. Figure 7 The heat drying device 800 further dries the moisture of the cured composite film to form a final film product. After passing through the heat drying device 800, the support film on the back of the base film completes its support function, and the support film under the base film is peeled off by the support film peeling roller 901.

[0096] Furthermore, a layer of protective coating can be added to the surface of the cured composite film, and the protective coating is electrostatically adsorbed on the surface of the cured composite film by a corona machine, and then rolled up to form a final product.

[0097] As an optional solution, the base film device, the front protective coating device, the coating device 400, the curing device, the heat drying device 800 and the rear film peeling and coating device 900 can all be set as modular structures, and each modular structure is set alone or in combination on a cabinet 1000.

[0098] like Figures 4 to 7As shown, the base film device and the front protective film 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 laminating device 900 are each separately a modular structure. When moving, the modular structure can be disassembled and moved separately, and can be spliced ​​and assembled.

[0099] All power devices, electrical equipment, cables and control devices are arranged on the cabinet 1000, and the main film-making process device is placed on the upper part of the cabinet 1000, which can facilitate operation and avoid interference with film-making caused by cables.

[0100] Each cabinet 1000 is a movable independent device, which can be combined and spliced ​​as needed, and a moving part and a locking part are arranged at the bottom of each cabinet 1000. The moving part can be a universal wheel, and the locking part can be a locking buckle.

[0101] Example 3

[0102] Combination Figures 1 to 7 The second object of the present application is to provide a system that uses the above-mentioned roll-to-roll coating film production line; the system is any one of a coater, a roll-to-roll device, a curing device, and a device with a coating process as the main or secondary structure.

[0103] Example 4

[0104] Combination Figure 1 The third object of the present 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 comprises:

[0105] S1, providing a base film and a support film;

[0106] S2, the support film is attached to the back of the base film by electrostatic adhesion;

[0107] S3, the composite film formed by the base film and the support film enters the sealed atmosphere box 300;

[0108] S4, the coating device 400 coats the composite film entering the atmosphere box 300;

[0109] S5, the curing device performs curing treatment on the coated composite film, and the composite film after curing treatment leaves the atmosphere box 300;

[0110] S6, performing a heat baking treatment on the composite film after the curing treatment;

[0111] S7, the composite film passes through the support film stripping roller 901 to strip the support film, then electrostatically adsorbs the protective coating, and is rolled up on the winding roller 904.

[0112] The coating film production method of the present application mainly includes providing materials, electrostatic attachment, entering the atmosphere box 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 the sealed atmosphere box 300 to ensure that the coating process is carried out under a specific environment. The coating device 400 performs precise coating operations on the composite film entering the atmosphere box 300. After the coating is completed, the curing device performs a curing treatment on the composite film, and the composite film leaves the atmosphere box 300 after treatment. The cured composite film is further subjected to a heat baking treatment to enhance its performance. After the composite film is stripped of the support film by the support film stripping roller 901, the coating is protected by electrostatic adsorption and finally rolled up on the winding roller 904.

[0113] This method makes full use of the continuous production advantages of roll-to-roll technology and achieves efficient and high-quality coating and film making by precisely controlling the conditions of each step. The introduction of the atmosphere box 300 provides a stable environment for the coating and curing process, ensuring the consistency and stability of the product. At the same time, the electrostatic adsorption technology of electrostatic adhesion and protective coating improves production efficiency and reduces material waste. The thermal baking treatment further enhances the performance of the composite film, making it meet a wider range of application needs.

[0114] In summary, this method not only improves production efficiency, but also ensures high product quality. The roll-to-roll coating and film-making production line has the advantages of high efficiency, flexibility, environmental protection, high quality and high degree of automation. It is suitable for the coating and film-making processes of various functional films.

[0115] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A roll-to-roll coating film production line, characterized in that: include: A base film device, wherein the base film device provides a base film; A front protective film coating device, wherein the front protective film coating device provides a support film; The base film is adsorbed on the support film to form a composite film; An atmosphere box, wherein the composite film enters the sealed atmosphere box; A coating device, the coating device is arranged in the atmosphere box, and is used to coat the composite film entering the atmosphere box; A curing device, wherein the curing device performs a curing treatment on the coated composite film, and the composite film after the curing treatment leaves the atmosphere box; A heat drying device, used for performing heat drying on the composite film after curing; A rear film peeling and laminating device, the rear film peeling and laminating device comprises a support film peeling roller, a protective film laminating roller and a winding roller, the composite film is peeled off the support film by the support film peeling roller, then the protective film is adsorbed and rolled up on the winding roller; The coating device comprises a coating head, a back plate and a coating substrate, wherein a longitudinal slit for injecting slurry is formed between the back plate and the bottom of the coating head; a transverse slit is formed between the coating substrate and the bottom surface of the coating head, and the longitudinal slit is connected with the transverse slit to form an L-shaped slit; the angle between the back plate and the coating substrate is α, a chamfer is provided at the transition section of the coating head, and the radian of the chamfer is 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 coating slurry viscosity η, the departure angle γ of the coating head, and the following are satisfied: 15°<α<135°; 0°<β<135°; 0≤r ≤ 20 cm; 3μm≤h≤5 mm; 1 cm≤l≤15 cm; 3mPa·s≤η≤1010 mPa·s; γ≤90°.

2. A roll-to-roll film coating production line according to claim 1, characterized in that: The coating device is arranged at an angle, 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 box, and the second support roller is arranged between the coating device and the curing device, and the height of the first support roller is lower than that of the second support roller, so that the composite film is arranged at an angle and passes through the transverse slit; the coating head performs an inclined coating on the composite film; and the composite film after the inclined coating is adjusted to a horizontal arrangement after passing through the second support roller.

3. A roll-to-roll film coating production line according to claim 2, characterized in that: The friction coefficients of the coating substrate and the supporting film are both less than 0.1, and the inclination angle of the coating substrate is 0-60°.

4. The roll-to-roll film coating production line according to claim 1, characterized in that: The curing device is an ultraviolet curing device; The ultraviolet light 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 box, and the light of the water-cooled ultraviolet curing lamp is irradiated toward 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.

5. A roll-to-roll film coating production line according to claim 4, characterized in that: The water-cooled ultraviolet curing lamp is a regional surface radiation light source, and the water-cooled ultraviolet curing lamp is provided with a horizontal reciprocating motion mechanism.

6. The roll-to-roll film coating production line according to claim 1, characterized in that: The inlet and outlet of the atmosphere box are both sealed with the surface of the composite film through an air curtain without contact, and the inlet and outlet of the atmosphere box are both sealed with the lower surface of the composite film; A gas valve for controlling the gas concentration inside the atmosphere box is provided inside the atmosphere box; The inlet and the outlet both adopt a single contact sealing port, which includes a lower contact bottom plate and an upper gas air curtain. The gas discharged by the upper gas air curtain is the same as the gas in the atmosphere box.

7. The roll-to-roll film coating production line according to claim 1, characterized in that: The base film device, front protective film coating device, coating device, curing device, heat drying device and rear film peeling and coating device are all modular structures, each modular structure is individually arranged on a cabinet, or multiple modular structures are combined and arranged together on a cabinet.

8. A coating machine, characterized in that: A roll-to-roll film coating production line according to any one of claims 1 to 7 is used.

9. A roll-to-roll device, characterized in that: A roll-to-roll film coating production line according to any one of claims 1 to 7 is used.

10. A curing device, characterized in that: A roll-to-roll film coating production line according to any one of claims 1 to 7 is used.

11. A device with coating process as the main or secondary structure, characterized in that: A roll-to-roll film coating production line according to any one of claims 1 to 7 is used.

12. 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 1 to 7; the roll-to-roll coating film production method comprises: Providing a base film and a support film; The support film is adsorbed on the back of the base film; The composite film formed by the base film and the support film enters a sealed atmosphere; coating the composite film entering the atmosphere; Performing a curing treatment on the coated composite film; Performing heat baking treatment on the composite film after curing treatment; After the composite film is peeled off from the supporting film, it is then adsorbed onto the protective covering film and finally rolled up.

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