Multifunctional coating device

Abstract

The invention discloses a multifunctional coating device which can be switched among three processes of extrusion coating, transfer coating and gravure coating. Comprising an unwinding mechanism, a coating mechanism, a baking mechanism, a driving mechanism and a winding mechanism. The unwinding mechanism is used for unwinding a base material. The coating mechanism is used for coating a base material with slurry and comprises an extrusion coating module, a transfer coating module and a gravure coating module. The baking mechanism is used for drying the slurry on the base material. The driving mechanism is used for driving base material conveying. And the winding mechanism is used for winding the coated base material. According to the multifunctional coating device disclosed by the invention, multiple coating processes are integrated into the same coating device, so that the equipment universality is improved.

Description

Technical Field

[0001] This invention belongs to the field of coating, and particularly relates to a multifunctional coating apparatus for integrating multiple coating processes into a single device. Background Technology

[0002] Coating is a key technology that involves uniformly, continuously, or in a predetermined pattern applying a slurry with specific functions to the surface of a substrate. This process is widely used in fields such as electrode manufacturing, and the quality and efficiency of coating directly determine the performance, consistency, and production cost of the final product.

[0003] Currently, coating processes, based on their material transfer and forming principles, can be mainly divided into extrusion coating, transfer coating, and gravure coating. However, existing coating equipment is typically designed for a single process. For example, the core components of an extrusion coating machine (such as the feeding system, slot coating head, and back roller) are optimized for extrusion processes, making it difficult to directly switch to high-precision gravure or transfer coating. This functional limitation prevents a rapid response to market demands for product diversification and process versatility, thus restricting the overall efficiency and competitiveness of the production line. Summary of the Invention

[0004] To address the technical problems existing in the prior art, the present invention provides a multifunctional coating device to improve the versatility of the equipment.

[0005] To achieve the above objectives, the multifunctional coating apparatus of the present invention includes: Unwinding mechanism, used for unwinding substrate; A coating mechanism, located downstream of the unwinding mechanism, is used to coat the slurry onto the substrate. The coating mechanism includes an extrusion coating module, a transfer coating module, and a gravure coating module. A baking mechanism, located downstream of the coating mechanism, is used to dry the slurry on the substrate; A driving mechanism, located downstream of the baking mechanism, is used to drive the substrate conveying; A winding mechanism, located downstream of the drive mechanism, is used to wind up the coated substrate.

[0006] In one embodiment of the multifunctional coating apparatus of the present invention, the extrusion coating module includes an extrusion die and an extrusion coating roller disposed opposite to each other, the substrate passing around the extrusion coating roller and contacting the extrusion die, the extrusion die being used to coat the substrate with slurry.

[0007] In one embodiment of the multifunctional coating apparatus of the present invention, the transfer coating module includes a transfer coating roller, a comma doctor blade, a rubber roller, and a first trough. The rubber roller and the first trough are disposed on both sides of the transfer coating roller. The first trough is used to contain slurry. A portion of the transfer coating roller is contained in the first trough. The substrate passes around the rubber roller and contacts the transfer coating roller. The comma doctor blade is disposed side by side with the transfer coating roller to scrape off excess slurry on the transfer coating roller. The transfer coating roller is configured to rotate to coat the substrate with the slurry in the first trough.

[0008] In one embodiment of the multifunctional coating apparatus of the present invention, the gravure coating module includes a gravure roller, a second pressure roller, and a second material trough. A portion of the gravure roller is accommodated in the second material trough. The second pressure roller is disposed opposite to the gravure roller to press the substrate toward the gravure roller. The second material trough is used to contain slurry. The gravure roller is configured to rotate to coat the slurry in the second material trough onto the substrate.

[0009] In one embodiment of the multifunctional coating apparatus of the present invention, the extrusion die is configured to be driven toward or away from the extrusion coating roller.

[0010] In one embodiment of the multifunctional coating apparatus of the present invention, the comma-shaped doctor blade is configured to be driven closer to or further away from the transfer coating roller to control the thickness of the slurry on the transfer coating roller; the rubber roller is configured to be driven closer to or further away from the transfer coating roller.

[0011] In one embodiment of the multifunctional coating apparatus of the present invention, the second feed trough and the second pressure roller are respectively configured to be driven to approach or move away from the gravure roller.

[0012] In one embodiment of the multifunctional coating apparatus of the present invention, a thickness measuring mechanism is further provided between the driving mechanism and the winding mechanism for measuring the thickness of the slurry on the substrate after coating.

[0013] In one embodiment of the multifunctional coating apparatus of the present invention, a plurality of guide rollers and tension rollers are arranged along the substrate conveying path.

[0014] In one embodiment of the multifunctional coating apparatus of the present invention, a plurality of straightening rollers are further provided along the substrate conveying path.

[0015] In summary, the multifunctional coating apparatus of the present invention improves the versatility of the equipment by integrating multiple coating processes into the same coating apparatus. Attached Figure Description

[0016] Figure 1 This is a structural diagram of an embodiment of the present invention;

[0017] Figure 2 yes Figure 1 Structural diagram of the unwinding mechanism;

[0018] Figure 3 yes Figure 1 Structural diagram of the intermediate coating mechanism;

[0019] Figure 4 It is the substrate path of the coating mechanism in the extrusion coating process;

[0020] Figure 5 The coating mechanism is located in the substrate path of the transfer coating process;

[0021] Figure 6 It is the substrate path of the coating mechanism in the gravure coating process;

[0022] Figure 7 yes Figure 1 Structural diagram of the drive mechanism;

[0023] Figure 8 yes Figure 1 Structural diagram of the winding mechanism;

[0024] In the diagram: 100, substrate; 200, substrate roll; 1, unwinding mechanism; 11, unwinding shaft; 12, tape receiving platform; 2, coating mechanism; 21, extrusion coating module; 211, extrusion die; 212, extrusion coating roller; 213, first pressure roller; 214, first adjusting assembly; 22, transfer coating module; 221, transfer coating roller; 222, comma-shaped doctor blade; 223, adhesive roller; 224, first feed trough; 225, second adjusting assembly. Components; 23. Gravure coating module; 231. Gravure roller; 232. Second pressure roller; 233. Second feed trough; 234. Third adjustment component; 235. Doctor blade; 236. Fourth adjustment component; 3. Baking mechanism; 4. Drive mechanism; 41. Main drive roller; 42. Third pressure roller; 43. Fifth adjustment component; 5. Thickness measuring mechanism; 6. Winding mechanism; 61. Winding shaft; 71. Through roller; 72. Tension roller; 73. Correction roller. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0026] This invention provides a multifunctional coating device, the core of which is to integrate three functional modules, namely extrusion coating, transfer coating and gravure coating, into a single equipment platform. The coating process can be flexibly switched according to production or R&D needs, thereby greatly improving the equipment's versatility, flexibility and economy.

[0027] like Figure 1As shown, the multifunctional coating apparatus provided in this embodiment of the invention includes, in sequence along the conveying direction of the substrate 100: an unwinding mechanism 1, a coating mechanism 2, a baking mechanism 3, a driving mechanism 4, a thickness measuring mechanism 5, and a winding mechanism 6. Multiple roller systems for support, guidance, tension adjustment, and deviation correction are arranged along the entire conveying path. For ease of description in this embodiment, "upstream" refers to the direction in which the substrate 100 arrives, and "downstream" refers to the direction in which the substrate 100 exits.

[0028] like Figure 2 As shown, the unwinding mechanism 1 is used to carry and release the substrate roll 200 to be coated. It typically includes: Unwinding shaft 11: Used to install substrate roll 200. It can be an air-expanding shaft or a keyway shaft to ensure a tight connection with the inner core of the material roll.

[0029] Unwinding drive element: Used to provide adjustable unwinding torque, linked with the downstream tension control system to maintain constant tension of the substrate 100 in the unwinding section. A magnetic powder brake or a servo motor can be used, with a servo motor preferred for more precise tension control and speed synchronization.

[0030] Connecting platform 12: Facilitates the splicing of new and old material rolls.

[0031] like Figure 3 As shown, the coating mechanism 2 is the core part of this invention, integrating three independent coating modules: an extrusion coating module 21, a transfer coating module 22, and a gravure coating module 23. Each module can be moved to the working position or returned to the standby position by a drive unit according to instructions.

[0032] The extrusion coating module 21 includes an extrusion die 211 and an extrusion coating roller 212 disposed opposite to each other. The substrate 100 bypasses the extrusion coating roller 212, with its coating surface facing outward. The extrusion die 211 has an extrusion channel and a cavity for containing slurry inside, and is connected to an external precision feeding system through pipelines. The slurry is uniformly extruded from the extrusion channel under pressure. The extrusion die 211 is mounted on a precision linear module or cylinder, and can be driven to move closer to or away from the extrusion coating roller 212 to adjust the gap (i.e., coating gap) between the extrusion die and the substrate 100. During operation, the extruded slurry contacts the moving substrate 100 in the gap between the extrusion coating roller 212 and the extrusion die 211, and is transferred to the surface of the substrate 100 to form a uniform coating.

[0033] A first pressure roller 213 is provided on one side of the extrusion coating roller 212 to press down the substrate 100 and prevent the substrate 100 from slipping during the coating process. The first pressure roller 213 is connected to a first adjustment component 214, and the distance between the inclined block and the stop block is controlled by a knob to control the gap between the first pressure roller 213 and the extrusion coating roller 212.

[0034] The substrate 100 is unwound by the unwinding mechanism 1 and conveyed through multiple rollers 71 and the extrusion coating module 21 via the following path: Figure 4 As shown.

[0035] The transfer coating module 22 includes a transfer coating roller 221, a comma doctor blade 222, a rubber roller 223, and a first slurry 224. The first slurry 224 stores the slurry, and its position is driven by a cylinder or servo cylinder to maintain a stable immersion relationship between the slurry level and the transfer coating roller 221. The transfer coating roller 221 is partially immersed in the slurry in the first slurry 224 and is driven to rotate by a servo motor, carrying the slurry up. The comma doctor blade 222 is a metering doctor blade with its cutting edge parallel to the surface of the transfer coating roller 221. Driven by a fine-tuning mechanism, the comma doctor blade 222 can precisely approach or move away from the surface of the transfer coating roller 221, thereby accurately scraping away excess slurry and leaving a uniformly thick slurry film on the roller surface.

[0036] A rubber roller 223 is positioned on the other side of the transfer coating roller 221, forming a pressure zone with it. The substrate 100 passes between them. The rubber roller 223 can be driven by a second adjusting component 225 to move closer to or further away from the transfer coating roller 221 to adjust the pressure zone and contact state. The second adjusting component 225 first pushes the entire mechanism forward via a cylinder, and after reaching the desired position, it then uses a servo motor to control the lead screw for fine adjustment, achieving the contact and pressing action between the rubber roller 223 and the transfer coating roller 221. A fixed amount of slurry on the surface of the transfer coating roller 221 is completely transferred to the substrate 100 at the pressure zone.

[0037] The substrate 100 is unwound by the unwinding mechanism 1 and conveyed through multiple rollers 71 and the transfer coating module 22, as follows: Figure 5 As shown.

[0038] The gravure coating module 23 includes a gravure roller 231, a second pressure roller 232, and a second feed trough 233. The surface of the gravure roller 231 is etched with cells of specific shapes and depths (such as diamonds or oblique lines), and part of it is immersed in the slurry in the second feed trough 233. During rotation, the cells carry a measured amount of slurry. The second feed trough 233 also has a lifting adjustment function to control the immersion depth.

[0039] The second pressure roller 232 is typically a roller with a surface coated with an elastic layer (such as EPDM rubber), forming a pressure zone opposite to the gravure roller 231. The second pressure roller 232 can be driven by a third adjusting component 234 to press the substrate 100 against the gravure roller 231. The structure of the third adjusting component 234 is the same as that of the first adjusting component 214. Under the pressure of the pressure zone, the paste within the cells of the gravure roller 231 is transferred to the surface of the substrate 100, forming a coating corresponding to the cell pattern.

[0040] The gravure coating module 23 also includes a scraper 235 and a fourth adjustment component 236 disposed on one side of the substrate 100 in the material feeding direction. The fourth adjustment component 236 adjusts the distance and angle between the scraper 235 and the gravure roller 231 by means of a cylinder, a manual adjustment screw, etc. The scraper 235 scrapes off the paste adhering to the gravure roller 231, thereby causing the excess paste to fall into the second material trough 233.

[0041] The substrate 100 is unwound by the unwinding mechanism 1 and conveyed through multiple rollers 71 and the gravure coating module 23 via the following path: Figure 6 As shown.

[0042] Each coating module of the coating mechanism 2 can also be directly distributed on the equipment plate of the coating mechanism 2. When switching between different coating processes, only the tape path of the substrate 100 needs to be changed.

[0043] The baking mechanism 3 is used to cure the coating. It is equipped with a temperature sensor and an exhaust regulating valve, and the temperature and steam concentration of each section are precisely controlled by a temperature control system. The baking mechanism 3 also has multiple guide rollers to increase the travel of the substrate 100 within the baking mechanism 3, ensuring sufficient drying time. The inlet and outlet of the baking mechanism 3 are equipped with air seal devices to reduce heat and steam leakage.

[0044] The drive mechanism 4 is the main traction power source, usually located after the baking mechanism 3, used to provide a stable linear speed and maintain stable tension. Its core is the main drive roller 41, typically a driven steel roller with a roughened surface to increase friction. The main drive roller 41 is driven by a high-power main servo motor via a reducer, ensuring high speed control precision. Multiple guide rollers 71 are typically provided at the inlet and outlet ends of the main drive roller 41, allowing the substrate 100 to contact the main drive roller 41 with a large wrap angle, preventing slippage and ensuring precise speed transmission. A third pressure roller 42 is also provided on one side of the main drive roller 41. The third pressure roller 42 is connected to a fifth adjusting component 43. The function of the third pressure roller 42 is the same as that of the first pressure roller 213, and the function and structure of the fifth adjusting component 43 are the same as those of the first adjusting component 214.

[0045] The thickness measuring mechanism 5 is located after the driving mechanism 4 and before the winding mechanism 6, and is used for online, non-contact measurement of the thickness of the dried coating.

[0046] like Figure 8 As shown, the winding mechanism 6 is used to roll the coated substrate 100 into a roll, including a winding shaft 61 and a winding motor (usually a servo motor). The winding motor operates in torque control mode and is linked with the tension detection roller after the thickness measuring mechanism 5 to achieve constant tension or tapered tension winding, ensuring that the roll is neat and has appropriate tension.

[0047] Throughout the entire device, there are various auxiliary rollers: guide roller 71, tension roller 72, and correction roller 73.

[0048] Multiple guide rollers 71, used to support and change the orientation of the substrate 100, are typically passively rotating smooth rollers. For example... Figure 3 The multiple rollers shown.

[0049] Multiple tension rollers 72, connected to tension sensors or pneumatic cylinders, are used to detect and buffer tension fluctuations in various stages (such as after unwinding, before coating, before baking, before main drive, and before rewinding). They are key components in forming a closed-loop tension control system and are typically floating rollers or oscillating rollers. Figure 3 The tension roller shown is positioned between unwinding and coating, and before baking. Figure 7 , Figure 8 The tension rollers shown before the main drive and before the winding are floating rollers. When the coating device starts and stops, the system will generate violent tension fluctuations. The floating rollers can absorb or alleviate the sudden changes through their own displacement to prevent violent tension fluctuations.

[0050] Multiple alignment rollers 73 are installed at key process points (such as the material inlet of coating mechanism 2, the inlet of baking mechanism 3, drive mechanism 4, thickness measuring mechanism 5, and before winding mechanism 6). The bearing housings of the alignment rollers 73 are mounted on a laterally sliding platform and driven by an alignment controller. The controller adjusts the lateral position of the rollers in real time based on signals from the edge detector, performing online alignment correction on the moving substrate 100 to ensure the alignment accuracy of coating and winding. Figure 7 The guide roller 73 is located upstream of the main drive roller 41 of the drive mechanism 4 shown.

[0051] Both the unwinding mechanism 1 and the winding mechanism 6 are equipped with correction rollers 73. The unwinding correction sensor is fixedly installed, and the position of the unwinding mechanism 1 is adjusted according to the detection position to make the substrate 100 centered, thereby achieving the purpose of correction. The winding correction sensor is installed together with the winding frame, and the position of the winding mechanism 6 is adjusted to make the substrate 100 centered during winding, thereby achieving the purpose of neat winding.

[0052] Working principle of this multifunctional coating device: During operation, first select the desired coating process (such as extrusion coating) on ​​the control interface. The system automatically moves the corresponding coating module (extrusion coating module 21) to the working position, while the other modules (transfer coating module 22, gravure coating module 23) are moved to a safe position. Manually thread the substrate 100 onto the tape. The substrate 100 is drawn out from the unwinding mechanism 1, and after correction and tension adjustment, it enters the coating mechanism 2 for coating (if the extrusion coating process is selected, the substrate 100 is coated between the extrusion die 211 and the extrusion coating roller 212; if the transfer coating process is selected, the substrate 100 is coated between the transfer coating roller 221 and the adhesive roller 223; if the gravure coating process is selected, the substrate 100 is coated between the gravure roller 231 and the second pressure roller 232). Subsequently, the wet coating enters the baking mechanism 3 to be dried and cured, is pulled by the main drive mechanism 4, and the thickness is detected by the thickness measuring mechanism 5. Finally, the finished product is wound up by the winding mechanism 6. When switching processes, simply select another mode in the control system, and the equipment will automatically adjust the coating mechanism configuration and corresponding process parameters.

[0053] The above description is only a part or preferred embodiment of this application. Neither the text nor the drawings should limit the scope of protection of this application. All equivalent structural transformations made using the content of this application's specification and drawings under the overall concept of this application, or direct / indirect applications in other related technical fields, are included within the scope of protection of this application.

Claims

1. A multifunctional coating device, characterized in that, It can switch between three processes: extrusion coating, transfer coating, and gravure coating, including: Unwinding mechanism, used for unwinding substrate; A coating mechanism, located downstream of the unwinding mechanism, is used to coat the slurry onto the substrate. The coating mechanism includes an extrusion coating module, a transfer coating module, and a gravure coating module. A baking mechanism, located downstream of the coating mechanism, is used to dry the slurry on the substrate; A driving mechanism, located downstream of the baking mechanism, is used to drive the substrate conveying; A winding mechanism, located downstream of the drive mechanism, is used to wind up the coated substrate.

2. The multifunctional coating apparatus as described in claim 1, characterized in that, The extrusion coating module includes an extrusion die and an extrusion coating roller arranged opposite each other. The substrate passes around the extrusion coating roller and comes into contact with the extrusion die. The extrusion die is used to coat the substrate with slurry.

3. The multifunctional coating apparatus as described in claim 1, characterized in that, The transfer coating module includes a transfer coating roller, a comma-shaped doctor blade, a rubber roller, and a first trough. The rubber roller and the first trough are disposed on both sides of the transfer coating roller. The first trough is used to contain slurry. A portion of the transfer coating roller is contained in the first trough. The substrate passes around the rubber roller and comes into contact with the transfer coating roller. The comma-shaped doctor blade is disposed alongside the transfer coating roller to scrape off excess slurry on the transfer coating roller. The transfer coating roller is configured to rotate to coat the substrate with the slurry in the first trough.

4. The multifunctional coating apparatus as described in claim 1, characterized in that, The gravure coating module includes a gravure roller, a second pressure roller, and a second material trough. A portion of the gravure roller is housed in the second material trough. The second pressure roller is disposed opposite to the gravure roller to press the substrate toward the gravure roller. The second material trough is used to hold slurry. The gravure roller is configured to rotate to coat the substrate with the slurry in the second material trough.

5. The multifunctional coating apparatus as described in claim 2, characterized in that, The extrusion die is configured to be driven toward or away from the extrusion coating roller.

6. The multifunctional coating apparatus as described in claim 3, characterized in that, The comma-shaped doctor blade is configured to be driven closer to or further away from the transfer coating roller to control the thickness of the slurry on the transfer coating roller; the rubber roller is configured to be driven closer to or further away from the transfer coating roller.

7. The multifunctional coating apparatus as described in claim 4, characterized in that, The second feed trough and the second pressure roller are respectively configured to be driven to approach or move away from the gravure roller.

8. The multifunctional coating apparatus as described in claim 1, characterized in that, A thickness measuring mechanism is also provided between the driving mechanism and the winding mechanism to measure the thickness of the slurry on the substrate after coating.

9. The multifunctional coating apparatus according to any one of claims 1-8, characterized in that, It also includes multiple guide rollers and tension rollers arranged along the substrate conveying path.

10. The multifunctional coating apparatus according to any one of claims 1-8, characterized in that, It also includes multiple alignment rollers arranged along the substrate conveying path.

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