Roll-to-roll double-sided coating equipment capable of preventing film layer from being scratched

Abstract

The utility model belongs to the technical field of flexible base material coating, and particularly relates to roll-to-roll double-sided coating equipment capable of preventing a film layer from being scratched, which comprises a vacuum cavity, and a base material unwinding device, a front surface coating device, a film pasting device, a back surface coating device and a winding device which are arranged in the vacuum cavity. The film pasting device is arranged between the front face film coating device and the back face film coating device and comprises a protective film unwinding roller, a first tension roller and a pasting roller, the protective film unwinding roller and the vacuum cavity are rotationally assembled, a channel gap allowing a base material and a protective film to pass through is formed between the first tension roller and the pasting roller, and the width of the channel gap is adjustable. The protective film attaching device is used for attaching a released protective film to a coating film layer; the winding device comprises a winding roller, and the winding roller makes contact with the protective film for winding. According to the utility model, segmented tension can be provided for the flexible base material in the conveying process, the device is suitable for the flexible base materials with different thicknesses, and the problem that a coating film layer is easily scratched in the existing coating technology is effectively solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of flexible substrate coating, and particularly relates to a roll-to-roll double-sided coating device for avoiding film layer scratching. Background Technique

[0002] The roll-to-roll double-sided coating device can uniformly coat one or more functional films on the surface of a flexible substrate, thereby endowing the flexible substrate with new optical, electrical, mechanical and other properties that it does not have itself, enhancing the functionality and reliability of the product, and being widely used in the fields of functional and decorative film preparation of flexible materials such as the photovoltaic industry, display technology, electronic components, and packaging materials.

[0003] The roll-to-roll double-sided coating device usually uses the magnetron sputtering method to coat the flexible substrate. During the process that electrons are accelerated and fly towards the substrate film under the action of an electric field, they collide with the sputtering gas argon to generate argon ions. The argon ions are accelerated and impact the surface of the target under the action of the electric field, sputtering out target atoms or molecules. The sputtered target atoms or molecules deposit on the substrate surface after energy exchange to form a film.

[0004] As shown in a roll-to-roll double-sided coating device with an arc target magnetron sputtering disclosed in a Chinese patent with the authorization announcement number of CN220564706U, which is currently commonly used, it includes an unwinding cavity, a coating cavity, and a winding cavity connected in sequence through an air isolation device; a first unwinding device and a guiding roller are arranged in the unwinding cavity, a winding device and a guiding roller are arranged in the winding cavity, two coating rollers are arranged in the coating cavity, one plasma cleaning device and several arc magnetron cathodes are attached to each coating roller, the arc magnetron cathode includes a base flange, a protective cover and an arc target are respectively arranged on both end faces of the base flange, and a cooling pipe is arranged in the protective cover.

[0005] In order to avoid the flexible substrate from being slack due to unbalanced tension on the unwinding side and the winding side, resulting in wrinkles and scratches during the transmission and winding processes, and at the same time to minimize the wrinkling or deformation caused by heat during the coating process, the flexible substrate needs to be as close as possible to the guiding roller and the coating roller. Therefore, the flexible substrate needs to bear a large tension during the coating process, and the entire flexible substrate with flexibility and bendability is stretched. After the stretched flexible substrate is wound and wound on the winding device, it shrinks due to no longer bearing tension, resulting in a wrinkling phenomenon and causing scratches on the surface film layer of the flexible substrate. Moreover, after the front side of the flexible substrate is coated and transmitted through the guiding roller, the front film layer directly contacts the reverse coating roller for reverse coating. Due to the large contact area between the two, the possibility of scratching the front film layer also increases.

[0006] Therefore, in the commonly used roll-to-roll double-sided coating equipment, the coating film layer is easily scratched during the startup, shutdown, and process coating of the equipment. Especially on the reverse coating roller and the winding device, due to the inevitable equipment structure and the characteristics of the flexible substrate, the problem of film layer scratching is more likely to occur. For coating products with high precision requirements, even slight scratching of the film layer has a great impact on the film layer performance and product quality. Summary of the Invention

[0007] The present invention provides a roll-to-roll double-sided coating equipment that avoids film layer scratching to solve the technical problem of easy scratching of the coating film layer in the existing flexible substrate coating equipment.

[0008] To solve the above problems, the roll-to-roll double-sided coating equipment that avoids film layer scratching provided by the present invention adopts the following technical solutions:

[0009] A roll-to-roll double-sided coating equipment that avoids film layer scratching includes a vacuum chamber and a substrate unwinding device, a front coating device, a film laminating device, a reverse coating device, and a winding device arranged in the vacuum chamber; the film laminating device is arranged between the front coating device and the reverse coating device, and includes a protective film unwinding roller, a first tension roller, and a laminating roller. The protective film unwinding roller is rotationally assembled with the vacuum chamber and is used for placing the protective film coil. A channel gap for the substrate and the protective film to pass through is formed between the first tension roller and the laminating roller, and the distance between the first tension roller and the laminating roller is adjustable; the laminating roller is attached to the reverse side of the substrate, and the laminating roller and the first tension roller are used to tightly attach the released protective film to the coating film layer of the substrate that has completed the front coating; the winding device includes a winding roller, and the winding roller contacts the protective film for winding.

[0010] Further, the laminating roller is movably assembled in the vacuum chamber along the common normal direction of the laminating roller and the first tension roller.

[0011] Further, lead screw elevators are connected to both ends of the laminating roller along the common normal direction of the laminating roller and the first tension roller. The lead screw elevator includes a driving motor, a connecting block connected to the laminating roller, a lead screw threadedly engaged with the connecting block, a guide rail slidably engaged with the connecting block in a guiding manner, and a conversion member connecting the lead screw and the driving motor.

[0012] Further, a second tension roller and a first flattening roller are sequentially arranged between the substrate unwinding device and the front coating device, and a second flattening roller is arranged between the film laminating device and the reverse coating device. A tension driving device for providing tension to the flexible substrate is connected to the second tension roller, and a rotational driving device capable of flattening the flexible substrate is connected to the first flattening roller and the second flattening roller.

[0013] Further, guide rollers are arranged on the front and rear sides of the second tension roller, the front and rear sides of the front coating device, and the front and rear sides of the reverse coating device.

[0014] Further, the coating method adopted by the front coating device and the back coating device is one of vacuum evaporation coating, vacuum sputtering coating, and vacuum ion coating.

[0015] Further, the front coating device and the back coating device are arranged at intervals in the up-down direction and are staggered in the conveying direction of the substrate.

[0016] The beneficial effects produced by the present utility model are as follows:

[0017] 1. A film sticking device is arranged between the front coating device and the back coating device. After the front side of the flexible substrate is coated, a protective film is stuck on the front coating film layer through the film sticking device, and then the back side is coated and wound up. During the winding process, the front side of the flexible substrate with the protective film is in direct contact with the winding roller and wound around the winding roller, avoiding the direct contact between the front coating film layer and the back coating device during the back coating process, and also avoiding the direct contact between the front coating film layer and the back coating film layer during the process of the winding roller winding the flexible substrate, thereby avoiding the problem of scratching of the coating film layer that easily occurs in the back coating link and the winding link of the existing roll-to-roll double-sided coating equipment.

[0018] 2. Screw jacks are connected to both ends of the laminating roller along the common normal direction of the laminating roller and the first tension roller, enabling the laminating roller to move along the common normal direction, and further enabling the adjustment of the gap size for the flexible substrate to pass between the laminating roller and the first tension roller, which is suitable for flexible substrates of different thicknesses and expands the application range of the film sticking device.

[0019] 3. A film sticking device is arranged between adjacent front coating devices and back coating devices. During the transmission of the flexible substrate, the first tension shaft on the film sticking device can cooperate with the front coating device and the back coating device respectively on the front and back sides to provide segmented tension for the flexible substrate, so that the tension borne by the flexible substrate during the transmission process is constant, avoiding uneven tension borne by the flexible substrate locally during the long-distance transmission process. Description of the Drawings

[0020] By referring to the accompanying drawings and reading the following detailed description, the above and other objects, features, and advantages of the exemplary embodiments of the present utility model will become easily understandable. In the drawings, several embodiments of the present utility model are shown in an exemplary rather than restrictive manner, and the same or corresponding reference numerals represent the same or corresponding parts, where:

[0021] Figure 1 Structural schematic diagram of a roll-to-roll double-sided coating equipment for avoiding film layer scratching;

[0022] Figure 2 First perspective view of the laminating roller;

[0023] Figure 3 It is a schematic diagram of the second perspective at the laminating roller.

[0024] Description of the reference numerals in the drawings:

[0025] 1. Flexible substrate; 2. Vacuum chamber; 3. Substrate unwinding device; 4. Front coating device; 5. Film laminating device; 6. Back coating device; 7. Rewinding device; 8. Protective film unwinding roller; 9. First tension roller; 10. Laminating roller; 11. Coating roller; 12. Plasma cleaning device; 13. Arc-shaped magnetron cathode; 14. Second tension roller; 15. First flattening roller; 16. Second flattening roller; 17. First guiding roller; 18. Second guiding roller; 19. Third guiding roller; 20. Fourth guiding roller; 21. Fifth guiding roller; 22. Sixth guiding roller; 23. Screw jack; 24. Servo motor; 25. Connecting block; 26. Screw; 27. Guide rail; 28. Converter. Detailed implementation manners

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Those skilled in the art should know that the embodiments described below are a part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of the present invention.

[0027] Next, various non-limiting implementation manners of the present invention will be specifically introduced. The number of any element in the drawings is for illustration rather than limitation, and any naming is only for distinction and does not have any limiting meaning.

[0028] Next, with reference to several representative implementation manners of the present invention, the principles and spirits of the present invention will be elaborated in detail.

[0029] Embodiment 1 of the roll-to-roll double-sided coating equipment for avoiding film layer scratches provided by the present invention:

[0030] As Figure 1 shown, the roll-to-roll double-sided coating equipment for avoiding film layer scratches includes a vacuum chamber 2 and a substrate unwinding device 3, a front coating device 4, a film laminating device 5, a back coating device 6, and a rewinding device 7 arranged in the vacuum chamber 2. The vacuum chamber 2 can provide the vacuum environment required for coating. The substrate unwinding device 3 is an unwinding roller, and the rewinding device 7 is a rewinding roller.

[0031] As Figure 2 and Figure 3As shown, the film laminating device 5 includes a protective film unwinding roller 8, a first tension roller 9, and a laminating roller 10. The protective film unwinding roller 8 is rotationally assembled with the vacuum chamber 2 and is used to place the protective film coil. The first tension shaft is arranged below the laminating shaft. A channel gap for the substrate and the protective film to pass through is formed between the first tension roller 9 and the laminating roller 10. At the channel gap, the film laminating device 5 laminates the protective film released by the protective film unwinding roller 8 onto the coated film layer of the substrate that has completed the front coating. Both ends of the laminating roller 10 are connected with a lead screw 26 elevator 23 along the common normal direction of the laminating roller 10 and the first tension roller 9, which can move the laminating roller 10 in the common normal direction to adjust the size of the channel gap according to the different thicknesses of the flexible substrate 1. The lead screw elevator 23 includes a servo motor 24, a connecting block 25 connected to the laminating roller 10, a lead screw 26 threadedly engaged with the connecting block 25, a guide rail 27 slidably engaged with the connecting block 25 for guiding, and a conversion member 28 connecting the lead screw 26 and the driving motor. Of course, in other embodiments, the lead screw 26 elevator 23 can also be replaced with a push rod drive structure connected to a driving motor, a push rod drive structure connected to a hydraulic cylinder, or other non-cylinder adjusting devices.

[0032] The front coating device 4 and the back coating device 6 have the same structure. Both use the magnetron sputtering method for coating and both include a coating roller 11, a plasma cleaning device 12, and a plurality of arc-shaped magnetron cathodes 13. The front coating device 4 and the back coating device 6 are respectively used to complete the front coating and the back coating of the flexible substrate 1. They are arranged at intervals in the up-down direction. The front coating device 4 is arranged close to the substrate unwinding device 3, and the back coating device 6 is arranged close to the winding device 7. And a film laminating device 5 is arranged between the front coating device 4 and the back coating device 6.

[0033] Between the front coating device 4 and the substrate unwinding device 3, a second tension roller 14 is arranged close to the substrate unwinding device 3, and a first flattening roller 15 is arranged close to the front coating device 4; a second flattening roller 16 is arranged between the back coating device 6 and the film laminating device 5. A first guide roller 17 and a second guide roller 18 are respectively arranged on the front and back sides of the second tension roller 14. A third guide roller 19 and a fourth guide roller 20 are respectively arranged on the front and back sides of the front coating device 4. A fifth guide roller 21 and a sixth guide roller 22 are respectively arranged on the front and back sides of the back coating device 6.

[0034] Servo motors 24 are connected to the first tension roller 9 and the second tension roller 14 to provide tension for the flexible substrate 1 during the conveying process; stepping motors are connected to the first flattening roller 15 and the second flattening roller 16 to ensure that the flexible substrate 1 is in a flattened state and does not wrinkle during the conveying process.

[0035] In a vacuum environment, the substrate unwinding roller releases the flexible substrate 1 coil. After the flexible substrate 1 is guided by the first guide roller 17 and tension is applied to the flexible substrate 1 by the second tension roller 14, it successively passes through the second guide roller 18, the first flattening roller 15, and the third guide roller 19, and then enters the front coating device 4 for front coating. The flexible substrate 1 after the front coating is guided by the fourth guide roller 20 and enters the channel gap formed between the first tension roller 9 and the laminating roller 10. The protective film released by the protective film unwinding roller 8 is laminated on the front coating film layer of the flexible substrate 1 at the channel gap. The flexible substrate 1 after the film lamination is flattened by the second flattening roller 16, guided by the fifth guide roller 21, and enters the back coating device 6. The front of the flexible substrate 1 with the protective film in contact with the coating roller 11 continues to be driven, while the back of the flexible substrate 1 is exposed under the plasma cleaning device 12 and the arc-shaped magnetron cathode 13 for back coating. The flexible substrate 1 after the back coating is guided by the sixth guide roller 22, and the front of the flexible substrate 1 with the protective film in contact with the winding roller for winding.

[0036] The present utility model adds a film laminating device 5 to the existing roll-to-roll double-sided coating equipment. By laminating a protective film on the front coating film layer, when the flexible substrate 1 is subjected to back coating, the front coating film layer does not directly contact the coating roller 11, and during the winding process, the front coating film layer and the back coating film layer do not directly contact, effectively avoiding the problem of scratching of the coating film layer that is prone to occur in the back coating link and the winding link of the existing roll-to-roll double-sided coating equipment.

[0037] In addition, in the description of this specification, the meaning of "a plurality of" is at least two, such as two, three or more, etc., unless otherwise clearly and specifically defined.

Claims

1. A roll-to-roll double-sided coating device to avoid scratching of the film layer, characterized in that: It includes a vacuum chamber and a substrate unwinding device, a front coating device, a film sticking device, a back coating device and a winding device arranged in the vacuum chamber; The film laminating device is arranged between the front film coating device and the back film coating device, and comprises a protective film unwinding roller, a first tension roller and a laminating roller. The protective film unwinding roller is rotatably assembled with the vacuum chamber and is used to place the protective film coil. A channel gap is formed between the first tension roller and the laminating roller for the substrate and the protective film to pass through, and the distance between the first tension roller and the laminating roller is adjustable. The laminating roller is laminated with the back side of the substrate, and the laminating roller and the first tension roller are used to laminate the released protective film tightly onto the coating film layer of the substrate that has completed the front film coating. The winding device comprises a winding roller, and the winding roller contacts the protective film for winding.

2. The roll-to-roll double-sided coating device for avoiding film scratches according to claim 1, characterized in that: The laminating roller is movably assembled in the vacuum chamber along the common normal direction of the laminating roller and the first tension roller.

3. The roll-to-roll double-sided coating device for avoiding film scratches according to claim 2, characterized in that: Both ends of the laminating roller are connected with a screw lift along the common normal direction of the laminating roller and the first tension roller. The screw lift includes a drive motor, a connecting block connected to the laminating roller, a screw threadedly matched with the connecting block, a guide rail slidingly matched with the connecting block, and a conversion piece connecting the screw and the drive motor.

4. A roll-to-roll double-sided coating device for avoiding film scratches according to any one of claims 1 to 3, characterized in that: A second tension roller and a first flattening roller are sequentially arranged between the substrate unwinding device and the front coating device, a second flattening roller is arranged between the film laminating device and the back coating device, the second tension roller is connected to a tension driving device for providing tension to the flexible substrate, and the first flattening roller and the second flattening roller are connected to a rotation driving device capable of flattening the flexible substrate.

5. The roll-to-roll double-sided coating device for avoiding film scratches according to claim 4, characterized in that: Guide rollers are arranged on the front and rear sides of the second tension roller, the front and rear sides of the front coating device, and the front and rear sides of the back coating device.

6. A roll-to-roll double-sided coating device for avoiding film scratches according to any one of claims 1 to 3, characterized in that: The coating method adopted by the front coating device and the back coating device is one of vacuum evaporation coating, vacuum sputtering coating and vacuum ion coating.

7. A roll-to-roll double-sided coating device for avoiding film scratches according to any one of claims 1 to 3, characterized in that: The front-side coating device and the back-side coating device are arranged at intervals in the up-down direction and staggered in the conveying direction of the substrate.

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