Continuous preparation method of multilayer film sheet powder and roll-to-roll conveying device

Abstract

The invention provides a continuous preparation method of multilayer film sheet powder and a roll-to-roll conveying device. The roll-to-roll conveying device comprises a first conveying device, a cutting device, a spin coating device, a second conveying device, a drying system, a stripping pool and a heating furnace. According to the continuous preparation method of the multilayer film sheet powder, online cutting, vacuum adsorption spin coating, drying, stripping, controllable discharging and heat treatment are integrated into a continuous process, defect accumulation caused by manual carrying and repeated positioning is reduced, and the consistency of the film thickness and the optical performance is improved; through a matched sacrificial layer-stripping liquid system, controllable stripping of the film can be realized under a mild condition, and a flaky powder suspension is obtained; and through post-treatment of the controllable discharge port of the stripping pool and the heating furnace, continuous collection and stabilization treatment of the flaky powder can be achieved, and the device is suitable for large-scale production.

Description

Technical Field

[0001] This invention relates to the field of ultraviolet protection technology, specifically to a method for continuous preparation of multilayer thin film powder and a roll-to-roll conveying device. Background Technology

[0002] Structural color materials can form specific reflection peaks in the visible light range through physical mechanisms such as light interference, diffraction, or scattering, thus exhibiting color effects without the need for dyes. They are characterized by their resistance to fading and high designability. Meanwhile, UV protection materials are widely used in cosmetics, coatings, textiles, and plastics. Existing systems mainly rely on organic UV absorbers or inorganic UV shielding agents (such as titanium dioxide and zinc oxide) to achieve UV blocking. However, traditional organic absorbers suffer from problems such as photostability, migration and exudation, and formulation compatibility; while inorganic shielding agents have good weather resistance, their use alone can easily lead to whitening, insufficient dispersion stability, or limited contribution to aesthetic decoration. Therefore, integrating "structural color decoration" and "UV protection function" into a single material system to form a composite functional material that combines aesthetics and protection has clear application needs and research and development value.

[0003] A Chinese patent with publication number CN118176242A discloses a method for preparing a structurally colored film and pigment. The film and particles can be used as interference pigments or coloring particles, such as glitter agents for various applications. The method includes the following steps: depositing a nanocrystal suspension containing cellulose nanocrystals onto a substrate; coating the nanocrystal suspension onto the substrate using a coater; aging the nanocrystal suspension to partially or completely restore the cholesterol-type structure lost during deposition and coating; drying the deposited nanocrystal suspension to allow the nanocrystals to self-assemble into a structurally colored film; and annealing the structurally colored film to increase its water resistance.

[0004] However, in the method for preparing structural coloring films and pigments disclosed in CN118176242A, as well as existing integrated solutions for structural color and ultraviolet protection, multilayer film interference structures can achieve visible light structural color through alternating high / low refractive index layers. Simultaneously, they utilize intrinsic material absorption or optical design to enhance reflection / absorption in the ultraviolet band, thus achieving both decoration and protection. However, the preparation of these multilayer films is mostly concentrated on substrate surface deposition, often employing methods such as vacuum deposition, magnetron sputtering, and atomic layer deposition. These methods involve high equipment investment and energy consumption, and continuous, low-cost, large-area preparation faces significant hurdles. While wet processes such as sol-gel spin coating and dip coating offer cost advantages, they are often carried out in laboratory batches, facing challenges in large-scale production such as cycle time, yield, thickness consistency, and defect control. Furthermore, for powder applications such as cosmetics, functional membrane materials are usually required to be made into sheet powders (sheet powders) to obtain good gloss and color rendering effects. However, the existing process of peeling multilayer membranes from the substrate to obtain sheet powders with controllable size is often complicated, has high requirements for substrate / membrane compatibility, and is prone to introducing strong corrosive peeling media or causing membrane breakage and low yield. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a method for continuous preparation of multilayer thin film powder and a roll-to-roll conveying device.

[0006] A continuous preparation method for multilayer thin film powder according to the present invention includes: The substrate is placed on the first conveying device, which continuously conveys the substrate, and the cutting device cuts the substrate into sheet-like substrates in an online manner. The first conveying device transports the sheet substrate to the spin coating device, which spin-coates a sacrificial layer on the surface of the sheet substrate and spin-coates a multilayer functional film on the surface of the sacrificial layer. The spin coating device conveys the spin-coated sheet substrate to the second conveying device and heats and dries it in the drying system; The second conveying device transports the dried sheet substrate to the stripping tank. The sacrificial layer swells and dissolves at least one of the following under the action of the stripping liquid in the stripping tank: the multilayer functional film is peeled off from the sheet substrate, forming a suspension containing sheet powder in the stripping tank. The suspension in the stripping tank is transported to a heating furnace for dehydration and heat treatment to obtain flaky powder.

[0007] Preferably, the multilayer functional film includes alternating high-refractive-index functional layers and low-refractive-index functional layers, as well as an ultraviolet isolation layer that blocks ultraviolet light.

[0008] Preferably, the spin coating apparatus performs both low-speed spreading spin coating and high-speed thinning spin coating on the sheet substrate during the spin coating process. The low-speed spreading and spinning rate is 100rpm to 800rpm, and the time is 1s to 15s; The high-speed spin coating speed is 800rpm~6000rpm, and the time is 5s~60s.

[0009] Preferably, the sacrificial layer formed on the sheet substrate and the stripping solution are a matched system; the stripping solution can cause the sacrificial layer to swell or dissolve at least one of the following: the stripping solution can not dissolve or significantly corrode the sheet substrate and the multilayer functional film.

[0010] Preferably, the sacrificial layer is a water-soluble or swellable polymer layer, and the stripping liquid is water or an aqueous solution.

[0011] According to the present invention, a roll-to-roll conveying device is provided for a method of continuous preparation of multilayer film powder as described in any one of the above-mentioned methods, comprising: a first conveying device, a cutting device, a spin coating device, a second conveying device, a drying system, a stripping tank, and a heating furnace. The first conveying device is used to continuously convey the substrate; The cutting device is used to cut the substrate into sheet-like substrates in an online manner; The spin coating apparatus is used to spin coat a sacrificial layer on the surface of the sheet substrate, and to spin coat a multilayer functional film on the sacrificial layer; The second conveying device is used to transport the dried sheet substrate to the stripping tank; The drying system is used to heat and dry the spin-coated sheet substrate. The stripping pool is used to swell and / or dissolve the sacrificial layer under the action of the stripping liquid in the stripping pool, so that the multilayer functional film is peeled off from the sheet substrate to form a suspension containing sheet powder. The heating furnace is used to dehydrate and heat-treat the suspension containing flaky powder in the stripping tank.

[0012] Preferably, the spin coating apparatus includes: a rotary table, a conveying ball bearing, a vacuum suction port, and a liquid dispensing device; The rotary table is used to support the sheet-like substrate and drive the sheet-like substrate to rotate. The conveying balls are disposed on the periphery of the rotary table and are used to guide and transfer the sheet substrate between the rotary table and the second conveying device. The vacuum suction port is disposed on the rotating table and is used to fix and adsorb the sheet-like substrate onto the rotating table. The liquid addition device is located above the rotating stage and is used to quantitatively add liquid to the sheet substrate.

[0013] Preferably, the liquid dispensing device includes a robotic arm and a liquid dispensing unit, wherein the liquid dispensing unit includes a syringe-type liquid dispensing head, a dispensing head, or a micro-pump head, and the liquid dispensing unit is mounted on the robotic arm.

[0014] Preferably, the stripping tank is provided with a controllable discharge port, which is connected to a conveying pipeline. The stripping tank conveys the suspension containing the flaky powder to the heating furnace through the controllable discharge port and the conveying pipeline.

[0015] Preferably, the stripping tank is provided with a stirring structure or a circulating flow structure to promote the uniform stripping of the sacrificial layer by the stripping liquid.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This invention integrates online cutting, vacuum adsorption spin coating, drying, peeling, controlled discharge, and heat treatment into a continuous process, reducing the accumulation of defects caused by manual handling and repeated positioning, and improving the consistency of film thickness and optical performance. Through a matched sacrificial layer-peeling liquid system, the film can be controlledly peeled off under mild conditions to obtain a sheet-like powder suspension. Through the controlled discharge port of the peeling tank and the post-treatment of the heating furnace, the sheet-like powder can be continuously collected and stabilized, making it suitable for large-scale production. Attached Figure Description

[0017] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram illustrating the structure of the roll-to-roll conveying device, which is the main feature of this invention. Figure 2 This is a schematic diagram illustrating the structure of the sheet-like substrate after spin coating, which is the main feature of this invention.

[0018] The figure shows: 1. Substrate; 21. First conveying device; 22. Second conveying device; 3. Cutting device; 4. Rotary table; 5. Conveying ball; 6. Vacuum suction port; 7. Liquid addition device; 8. Drying system; 9. Stripping tank; 10. Heating furnace; 11. Sheet substrate; 12. Sacrificial layer; 13. High refractive index functional layer; 14. Low refractive index functional layer; 15. Ultraviolet isolation layer. Detailed Implementation

[0019] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0020] like Figure 1 As shown, a roll-to-roll conveying device according to the present invention includes: a first conveying device 21, a cutting device 3, a spin coating device, a second conveying device 22, a drying system 8, a stripping tank 9, and a heating furnace 10.

[0021] The cutting device 3 is mounted on the first conveying device 21, which continuously conveys the substrate 1. The cutting device 3 cuts the substrate 1 into sheet-like substrates 11 in an online manner. The cutting device 3 can be a mechanical cutting device, a rotary cutting device, a die-cutting device, or a laser cutting device. While the substrate 1 is continuously conveyed on the first conveying device 21, the cutting device 3 can continuously cut the substrate. The cut sheet-like substrates 11 are then conveyed by the first conveying device 21 to the spin coating device.

[0022] Specifically, the sheet-like substrate is square, with a side length of 5mm to 100mm. Further, the side length of the square sheet-like substrate is 30mm to 70mm. The square sheet-like substrate balances spin coating uniformity and production capacity.

[0023] The spin coating device is installed at the tail of the first conveying device 21. After each sheet substrate 11 falls onto the spin coating device, the spin coating device is used to spin coat a sacrificial layer 12 on the surface of the sheet substrate 11, and spin coat a multilayer functional film on the sacrificial layer 12. The spin coating device then conveys the spin-coated sheet substrate 11 to the second conveying device 22.

[0024] The second conveying device 22 is installed at the tail of the spin coating device, and the drying system 8 is installed at the top of the second conveying device 22. While the second conveying device 22 conveys the sheet substrate 11, the drying system 8 heats and dries the spin-coated sheet substrate 11. The heating and drying by the drying system 8 is used to reduce solvent residue and provide a process window for subsequent stripping. Then, the second conveying device 22 is used to transport the dried sheet substrate 11 to the stripping tank 9.

[0025] Specifically, the first conveying device 21 and the second conveying device 22 are at least one of belts and rollers.

[0026] The stripping pool 9 is installed at the tail of the second conveying device 22. The stripping pool 9 is used to swell and / or dissolve the sacrificial layer 12 under the action of the stripping liquid in the stripping pool 9, so that the multilayer functional film is stripped from the sheet substrate 11 to form a suspension containing sheet powder.

[0027] A heating furnace 10 is installed at the product outlet of the stripping tank 9. The heating furnace 10 is used to dehydrate and heat treat the suspension containing flaky powder in the stripping tank 9.

[0028] According to the present invention, a continuous preparation method for multilayer thin film powder is provided, employing the above-mentioned roll-to-roll conveying device, comprising: The substrate 1 is placed on the first conveying device 21, which continuously conveys the substrate 1 in the form of a roll. The cutting device 3 cuts the substrate 1 into sheet-like substrates 11 in an online manner.

[0029] The first conveying device 21 conveys the sheet substrate 11 to the spin coating device, which spins the sheet substrate 11 to form a sacrificial layer 12, and spins the sacrificial layer 12 to form a multilayer functional film.

[0030] The sacrificial layer 12 is formed by spin coating. The material of the sacrificial layer 12 can be a water-soluble or swellable polymer system, which swells and dissolves in the stripping solution of the subsequent stripping bath. The thickness of the sacrificial layer 12 can be adjusted according to the stripping efficiency and load-bearing capacity. The dry film thickness of the sacrificial layer 12 is preferably 50 nm to 20 μm, and more preferably 0.2 μm to 3 μm.

[0031] The spin coating device transports the spin-coated sheet substrate 11 to the second conveying device 22 and heats and dries it in the drying system 8.

[0032] The second conveying device 22 transports the dried sheet substrate 11 to the stripping tank 9. The sacrificial layer 12 swells and dissolves at least one of the following under the action of the stripping liquid in the stripping tank 9, and the multilayer functional film is peeled off from the sheet substrate 11, forming a suspension containing sheet powder in the stripping tank 9. When the sheet substrate 11 is reusable, the sheet substrate 11 left here can be removed after a period of time, cleaned, and recycled.

[0033] The suspension in the stripping tank 9 is transported to the heating furnace 10 for dehydration and heat treatment to obtain flaky powder.

[0034] Flake-shaped powders can exhibit structural colors in the visible light band and have a blocking effect in the ultraviolet band.

[0035] This invention integrates online cutting, vacuum adsorption spin coating, drying, peeling, controlled discharge, and heat treatment into a continuous process, reducing the accumulation of defects caused by manual handling and repeated positioning, and improving the consistency of film thickness and optical performance. Through a matching sacrificial layer 12-peeling liquid system, the film can be controlledly peeled off under mild conditions to obtain a sheet-like powder suspension. Through the controlled discharge port of the peeling tank and the post-treatment of the heating furnace, the sheet-like powder can be continuously collected and stabilized, making it suitable for large-scale production.

[0036] like Figure 2 As shown, in one feasible embodiment, a multilayer functional film is stacked on the surface of the sacrificial layer 12. The multilayer functional film includes alternating high-refractive-index functional layers 13 and low-refractive-index functional layers 14, and an ultraviolet blocking layer 15 that blocks ultraviolet light. The high-refractive-index functional layers 13 and low-refractive-index functional layers 14 alternate to form the structural color. Each layer can be formed by spin coating from a sol, precursor solution, or dispersion. Specifically, the thickness of a single dry film is 10 nm to 500 nm, and further, the thickness of a single dry film is 30 nm to 200 nm, to achieve the designable controllability of the structural color center wavelength and color parameters such as saturation and brightness.

[0037] Specifically, the high refractive index layer material can be one or more of titanium dioxide (TiO2), zirconium oxide (ZrO2), hafnium oxide (HfO2), tantalum pentoxide (Ta2O5), niobium pentoxide (Nb2O5), cerium oxide (CeO2), tin oxide (SnO2), etc.; the low refractive index layer material can be one or more of silicon dioxide (SiO2), magnesium fluoride (MgF2), aluminum fluoride (AlF3), porous silicon dioxide, fluorinated siloxane / organosiloxane materials, low refractive index polymer materials, etc.; the ultraviolet isolation layer 15 material can be one or more of zinc oxide (ZnO), titanium dioxide (TiO2), cerium oxide (CeO2), tin oxide (SnO2), doped zinc oxide (such as Al-doped ZnO), organic ultraviolet absorbers (such as benzotriazoles, triazines, benzophenones, etc.), etc., or a composite system of the above inorganic materials and organic ultraviolet absorbers. Each of the above layers can be spin-coated using a sol-gel precursor solution, a nanoparticle dispersion, a precursor solution, or a combination thereof. In addition to the film-forming components, the precursor solution may also contain solvents and additives for stabilization, wetting, or rheological control, to adapt to quantitative liquid addition and spin-coating to obtain the target film thickness and uniformity.

[0038] In one feasible implementation, to avoid adverse interface reactions or insufficient interface stability between certain functional layers, a transition layer can be set between the two types of functional layers; the material selection of the transition layer should meet the requirements of improving interface compatibility without affecting the structural color design and UV blocking effect.

[0039] In one feasible implementation, the spin coating apparatus performs spin coating on the sheet substrate 11, including a multi-stage rotation speed program: low-speed spreading spin coating and high-speed thinning spin coating. The low-speed spin coating rate is 100 rpm to 800 rpm, and the time is 1 s to 15 s; the high-speed spin coating rate is 800 rpm to 6000 rpm, and the time is 5 s to 60 s. Different speed programs can be set to control the film thickness for different layers based on the viscosity and evaporation rate of the precursor liquid.

[0040] Specifically, the low-speed spreading spin coating rate is 200 rpm to 600 rpm, and the time is 1 s to 15 s; the high-speed thinning spin coating rate is 2000 rpm to 6000 rpm, and the time is 5 s to 60 s.

[0041] In one feasible embodiment, the sacrificial layer 12 formed on the sheet substrate 11 and the stripping solution are a matched system; the stripping solution can cause the sacrificial layer 12 to swell or dissolve at least one of the following: the stripping solution can not dissolve or significantly corrode the sheet substrate 11 and the multilayer functional film. The temperature of the stripping solution is 5°C to 80°C, and the stripping residence time of the sheet substrate 11 in the stripping tank 9 is 0.5 min to 60 min.

[0042] Furthermore, the temperature of the stripping solution is 15℃~60℃, and the stripping residence time of the sheet substrate 11 in the stripping tank 9 is 2min~20min.

[0043] In one feasible embodiment, the sacrificial layer 12 is a water-soluble or swellable polymer layer, and the stripping solution is water or an aqueous solution. Specifically, when the sacrificial layer 12 is methylcellulose, the stripping solution can be an aqueous solution in which the methylcellulose first swells and then dissolves, allowing the multilayer functional film to peel off from the substrate and form a sheet-like powder suspension. To adjust the stripping rate, a modifier, such as a salt, surfactant, or buffer system, can be added to the aqueous solution to alter the swelling / dissolution kinetics; however, the choice of modifier should ensure that it does not dissolve or erode the substrate or the multilayer functional film.

[0044] In one feasible implementation, the drying system 8 can be hot air drying, infrared drying, or a combination of both. The drying temperature of the drying system is 60℃ to 200℃, and further, the drying temperature of the drying system is 80℃ to 150℃. The drying time can be achieved by the conveying speed and the length of the heating zone, and the equivalent residence time is 1min to 60min, and further, the equivalent residence time is 5min to 20min.

[0045] In one feasible embodiment, the heating furnace 10 includes a dehydration and drying zone and a high-temperature treatment zone. The temperature of the dehydration and drying zone is 80°C to 200°C, which is used to dehydrate the suspension containing flake powder. The high-temperature treatment zone is used to heat treat the flake powder to remove residual organic matter and improve the stability and weather resistance of the multilayer functional film. The temperature of the high-temperature treatment zone is 300°C to 700°C, and more preferably 400°C to 650°C.

[0046] Furthermore, the heat treatment time can be from 10 minutes to 240 minutes; the atmosphere is one that does not react with the powder, such as air, oxygen, or an inert atmosphere. After heat treatment, a sheet-like powder product is obtained.

[0047] In one feasible embodiment, the spin coating apparatus includes: a rotary table 4, a conveying ball bearing 5, a vacuum suction port 6, and a liquid dispensing device 7.

[0048] The rotary table 4 is used to support the sheet substrate 11 and drive the sheet substrate 11 to rotate.

[0049] The conveying balls 5 are arranged around the rotary table 4 to guide and transfer the sheet substrate 11 between the rotary table 4 and the second conveying device 22. In order to achieve continuous operation, the infeed end and the outfeed end of the rotary table 4 are provided with limit structures, so that the sheet substrate 11 that arrives later is pushed out of the rotary table 4 and introduced into the second conveying device 22 by the action of the conveying balls 5, thereby realizing continuous sheet output.

[0050] Vacuum suction port 6 is set on the rotating table 4 and is connected to a negative pressure source to fix and adsorb the sheet substrate 11 onto the rotating table 4. The sheet substrate 11 cut by the cutting device 3 on the first conveying device 21 will enter the spin coating device and fall onto the rotating table 4. The vacuum suction port 6 is set at the center of the rotating table 4. The vacuum suction port 6 adsorbs and positions the sheet substrate 11, reducing the risk of slippage during spin coating and preventing the sheet substrate 11 from warping.

[0051] Specifically, the adsorption negative pressure of the vacuum suction port 6 is -10kPa to -90kPa, and further, the adsorption negative pressure of the vacuum suction port 6 is -50kPa to -80kPa.

[0052] The liquid addition device 7 is located above the rotating stage and is used to quantitatively add liquid to the sheet-like substrate 11. The liquid addition device 7 is used to quantitatively dropwise add the precursor solution of the sacrificial layer 12 and the precursor solutions of each layer of the multilayer functional film to the surface of the sheet-like substrate 11. The quantitative liquid addition volume can be from 1 μL to 1 mL, more preferably from 20 μL to 500 μL; the dropping position can be a single point drop at the center or multiple points drop along a preset trajectory to improve the spreading uniformity of the large-size sheet-like substrate.

[0053] In one feasible implementation, the liquid dispensing device 7 includes a robotic arm and a liquid dispensing unit, which includes a syringe-type liquid dispensing head, a dispensing head, or a micro-pump head, and is mounted on the robotic arm.

[0054] In one feasible implementation, the stripping tank 9 is equipped with a controllable discharge port, which is connected to a conveying pipeline. The stripping tank 9 conveys the suspension containing flaky powder to the heating furnace 10 through the controllable discharge port and the conveying pipeline. The controllable discharge port may be equipped with a solenoid valve, ball valve, or needle valve to realize the start / stop and flow regulation of the suspension output.

[0055] In one feasible implementation, the stripping tank 9 is equipped with a mild stirring or circulating flow structure to improve the uniformity of stripping; the stirring intensity is selected and controlled within the range that does not damage the morphology of the flake powder, and the stirring speed can be from 10 rpm to 300 rpm, more preferably from 50 rpm to 200 rpm.

[0056] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0057] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A method for continuous production of a multi-layered thin film sheet, characterized by, The method comprises the following steps: placing a substrate (1) on a first conveying device (21) which continuously conveys the substrate (1), and cutting the substrate (1) into a sheet substrate (11) by a cutting device (3); conveying the sheet substrate (11) to a spin coating device by the first conveying device (21), and forming a sacrificial layer (12) on the surface of the sheet substrate (11) by spin coating, and forming a multi-layer functional film on the surface of the sacrificial layer (12) by spin coating; conveying the sheet substrate (11) after spin coating to a second conveying device (22) and heating and drying in a drying system (8); conveying the sheet substrate (11) after drying to a stripping tank (9) by the second conveying device (22), and swelling and dissolving at least one of the sacrificial layer (12) in the stripping tank (9) under the action of a stripping solution, and stripping the multi-layer functional film from the sheet substrate (11) to form a suspension containing sheet powder in the stripping tank (9); conveying the suspension in the stripping tank (9) to a heating furnace (10) for dehydration and heat treatment to obtain sheet powder.

2. The continuous process for the preparation of multilayer thin film sheet of claim 1, wherein, The multi-layer functional film comprises high refractive index functional layers (13) and low refractive index functional layers (14) which are alternately stacked, and an ultraviolet isolation layer (15) which has a blocking effect on the ultraviolet wave band.

3. The continuous process for the preparation of multilayer thin film sheet of claim 1, wherein, The spin coating device comprises low-speed spreading spin coating and high-speed thinning spin coating during the spin coating process on the sheet substrate (11). The speed of the low-speed spreading spin coating is 100 rpm to 800 rpm, and the time is 1 s to 15 s. The speed of the high-speed thinning spin coating is 800 rpm to 6000 rpm, and the time is 5 s to 60 s.

4. The continuous process for the preparation of multilayer thin film sheet of claim 1, wherein, The sacrificial layer (12) formed on the sheet substrate (11) is a matching system with the stripping solution; the stripping solution can at least one of swell and dissolve the sacrificial layer (12); and the stripping solution cannot dissolve or significantly erode the sheet substrate (11) and the multi-layer functional film.

5. The continuous process for the preparation of multilayer thin film sheet of claim 4, wherein, The sacrificial layer (12) is a water-soluble or swellable polymer layer, and the stripping solution is water or an aqueous solution.

6. A roll-to-roll transport apparatus characterized by, The method for continuously preparing the multi-layer film sheet powder according to any one of claims 1 to 5 comprises a first conveying device (21), a cutting device (3), a spin coating device, a second conveying device (22), a drying system (8), a stripping tank (9), and a heating furnace (10). The first conveying device (21) is used for continuously conveying the substrate (1). The cutting device (3) is used for cutting the substrate (1) into a sheet substrate (11) in line. The spin coating device is used for forming a sacrificial layer (12) on the surface of the sheet substrate (11) by spin coating, and forming a multi-layer functional film on the sacrificial layer (12) by spin coating. The second conveying device (22) is used for conveying the sheet substrate (11) after drying to a stripping tank (9). The drying system (8) is used for heating and drying the sheet substrate (11) after spin coating. The peeling tank (9) is used for swelling and / or dissolving the sacrificial layer (12) under the action of a peeling solution in the peeling tank (9), so as to peel the multi-layer functional film from the sheet-shaped substrate (11) and form a suspension containing sheet-shaped powder; The heating furnace (10) is used for dehydrating and heat-treating the suspension containing sheet-shaped powder in the peeling tank (9).

7. The roll-to-roll transport apparatus of claim 6, wherein, The spin coating device comprises a rotating table (4), a conveying ball (5), a vacuum suction port (6) and a liquid adding device (7); The rotating table (4) is used for carrying the sheet-shaped substrate (11) and driving the sheet-shaped substrate (11) to rotate; The conveying ball (5) is arranged on the circumferential side of the rotating table (4) and is used for guiding and transferring the sheet-shaped substrate (11) between the rotating table (4) and the second conveying device (22); The vacuum suction port (6) is arranged on the rotating table (4) and is used for fixing and adsorbing the sheet-shaped substrate (11) on the rotating table (4); The liquid adding device (7) is located above the rotating table, and the liquid adding device (7) is used for quantitatively adding liquid to the sheet-shaped substrate (11).

8. The roll-to-roll transport apparatus of claim 6, wherein, The liquid adding device (7) comprises a mechanical arm and a liquid adding unit, the liquid adding unit comprises a needle cylinder type liquid adding head, a dispensing head or a micro pump head, and the liquid adding unit is installed on the mechanical arm.

9. The multiple web-to-web conveyor of claim 6 wherein, The peeling tank (9) is provided with a controllable discharge port, the controllable discharge port is communicated with a conveying pipeline, and the peeling tank (9) conveys the suspension containing sheet-shaped powder to the heating furnace (10) through the controllable discharge port and the conveying pipeline.

10. The multiple web-to-web conveyor of claim 6 wherein, The peeling tank (9) is provided with a stirring structure or a circulating flow structure, which is used for promoting the uniform peeling of the sacrificial layer (12) by the peeling solution.

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