A method for preparing a gas-electrically driven thin film surface microstructure

Abstract

The application discloses a kind of gas-electric drive film surface microstructure preparation method;It is related to film preparation technical field, gas drive includes negative pressure adsorption auxiliary film surface microstructure imprint and positive pressure auxiliary film surface microstructure demolding.Electric drive includes negative electric field auxiliary film surface microstructure imprint and positive electric field auxiliary film surface microstructure demolding.The device mainly includes workbench, drive assembly, roll-to-roll roller assembly, transmission assembly, direct current electric field device, air pressure control assembly, heating and screw extrusion assembly installed on workbench.Drive assembly provides power, through transmission assembly, drives roll-to-roll roller assembly to rotate.Polymer material is heated and melted, and is made into film by screw extrusion assembly, after imprinting and demolding by roll-to-roll roller assembly, the film with surface microstructure is formed;The present application can reduce imprinting pressure and demolding force, effectively solve the problems such as low forming rate of film surface microstructure, demolding damage and the like.

Description

Technical Field

[0001] This application relates to the field of thin film preparation technology, and in particular to a method for preparing gas-electric driven thin film surface microstructures. Background Technology

[0002] With the continuous development of industry in recent years, the market demand for thin film products is also increasing, especially in fields such as home appliances, medical devices, automobiles, glass, and lenses. The demand for diverse performance characteristics is growing, creating an urgent need for films with superior properties to meet the needs of various industries. Processing microstructures on thin films can endow them with special properties, such as superhydrophobicity, light transmittance, corrosion resistance, and self-cleaning properties, thereby increasing the value of the film and enabling its wider application in agriculture, industry, and daily life, meeting people's needs. The existing production method involves setting up two template rollers and an imprinting roller rotating in opposite directions. The film passes between the two rollers to complete the imprinting process. This process suffers from problems such as low microstructure formation rate, incomplete structure replication, susceptibility to damage, and difficulty in demolding. When cooling is too rapid during the imprinting process, the replication rate and accuracy of the imprinted structure are low, and tearing and scratches are more likely to occur during demolding, all of which urgently need to be addressed.

[0003] To address the aforementioned issues, Gu Yan and Lin Jieqiong of Changchun University of Technology invented an ultrasonic-assisted roller-to-roller thermal nanoimprinting device [CN201710871085.4]. This invention uses a belt template, which prevents the mold from immediately separating from the polymer substrate after thermal imprinting, thus extending the cooling and curing time and improving the resolution and accuracy of the microstructure. However, this method only assists imprinting by extending the cooling and curing time and does not significantly improve the forming rate of the imprinted microstructure, and it also increases the difficulty of demolding. Peng Linfa, Huang Jihui, and others from Shanghai Jiao Tong University invented an electrically assisted rapid imprinting forming device for workpiece surface microstructures [201910838513.2]. This device achieves point-by-point forming through high-frequency vibration and introduces current into the processing to improve the forming quality. However, this method is difficult to operate, hard to apply in practice, and does not improve demolding. Xu Zhilong et al. from Jimei University invented an ultrasonic-assisted reciprocating oscillating roll-to-fixed roll hot roller embossing device [201921540851.X]. This invention improves the fixed pressure roller into an oscillating component, overcoming the defect that the embossing process can only apply pressure to a fixed position, increasing the range of pressure positions, and improving the precision and efficiency of embossing. However, this method involves complex oscillation motion, which can affect the uniformity of film thickness, and has no significant improvement effect on demolding. Summary of the Invention

[0004] To improve the imprinting quality and enable rapid film demolding, this application provides a gas-electric driven method for preparing microstructures on the surface of thin films, employing the following technical solution:

[0005] A gas-electric driven method for preparing microstructures on the surface of thin films, which enhances the imprinting and demolding of microstructures on the surface of thin films by combining gas-driven and electric-driven methods;

[0006] The main components of the device include a worktable, a drive assembly, a roll-to-roll roller assembly, a transmission assembly, a DC electric field device, a pneumatic control assembly, and a heating and screw extrusion assembly mounted on the worktable.

[0007] The pneumatic control unit is installed on the bottom plate of the workbench and connected to the cavity of the template roller through an air pipe; the DC electric field device is installed on the side plate of the workbench and connected to two auxiliary rollers through brushes.

[0008] The drive assembly provides power, which, through the transmission assembly, drives the roll-to-roll roller assembly to rotate;

[0009] The polymer film preparation process is roll-to-roll continuous imprinting;

[0010] The polymer material is heated and melted at a temperature determined by the polymer's melting point. The melted polymer material is then extruded into a film by a screw extrusion assembly, and then pressed and demolded by a roll-to-roll roller assembly to form a film with a surface microstructure.

[0011] During the polymer film imprinting process, a negative pressure adsorption force is formed in the cavity of the template roller, and a negative electric field is formed between the template roller and the imprinting auxiliary roller, providing electrostatic adsorption force, thereby reducing the imprinting pressure and improving the forming rate of surface microtexture;

[0012] During the demolding process of polymer film, the cavity of the template roller generates a positive pressure demolding force, and a positive electric field is formed between the template roller and the demolding auxiliary roller, providing electrostatic repulsion force, thereby reducing demolding force and film demolding damage.

[0013] Furthermore, the roll-to-roll roller assembly includes a template roller, an impression roller, and a demolding roller. The template roller, the impression roller, and the demolding roller are all rotatably connected to the worktable in parallel, and the three are arranged in a triangular configuration.

[0014] The template roller includes a template sleeve and a roller. The roller is fixedly connected to the worktable, and the template sleeve is coaxially sleeved outside the roller. The drive assembly drives the template sleeve to rotate through a linkage assembly.

[0015] When the drive assembly is started, the template sleeve rotates at the same angular velocity as the imprinting roller via the linkage assembly. The film passes between the template roller and the imprinting roller, and the imprinting roller copies the structure on the template roller onto the film through imprinting.

[0016] Furthermore, the drive assembly includes a servo motor, a drive shaft, a transmission shaft, a drive pulley, a driven pulley, and a transmission belt. The drive shaft is rotatably connected to the worktable and is used to drive the template roller to rotate. The servo motor is fixedly connected to the worktable by bolts. The transmission shaft is fixedly connected to the output shaft of the servo motor. The drive pulley is fixedly connected to the transmission shaft, and the driven pulley is fixedly connected to the drive shaft. The transmission belt is engaged and sleeved on the drive pulley and the driven pulley.

[0017] Furthermore, the transmission assembly includes a driving gear, a driven gear, a driven shaft, a linkage shaft, and a linkage gear; the driving gear is coaxially and fixedly connected to the driving shaft.

[0018] The driven shaft is rotatably connected to the worktable, the impression roller is coaxially fixedly connected to the driven shaft, and a driven gear that meshes with the driving gear is coaxially fixedly connected to the driven shaft;

[0019] The linkage shaft is rotatably connected to the worktable, the demolding roller is coaxially fixedly connected to the linkage shaft, and the linkage gear is coaxially fixedly connected to the linkage shaft and meshes with the drive gear.

[0020] Furthermore, the linkage component includes a connecting rod and a connecting sleeve. The connecting sleeve is fixedly connected to the active rotating shaft, and the two ends of the connecting rod are respectively fixedly connected to the connecting sleeve and the template sleeve.

[0021] Furthermore, the pneumatic control component includes an air pump and an air pipe; the template roller has a cavity one and a cavity two, both of which are connected to the surface of the template roller through a narrow slit; the cavity one and the cavity two are arranged sequentially along the rotation direction of the template roller, and the cavity one is located at the imprinting position of the template roller; the air pump is fixedly connected to the worktable, and the air pump is used to draw air from the cavity one and blow air into the cavity two;

[0022] The air pump generates a negative pressure adsorption force on the surface of the microstructure in the first region of the cavity and a positive pressure demolding force on the surface of the microstructure in the second region of the cavity, with the pressure range within one atmosphere, to assist in the imprinting and demolding of the microstructure on the surface of the template roller.

[0023] Furthermore, a visible light cationic generator is added to the raw material of the heating and screw extrusion assembly; the DC electric field device includes a DC power supply, two positive brushes and two negative brushes, both of which are fixedly connected to the worktable by a fixing rod, wherein one of the positive brushes is connected to the impression roller and the other positive brush is connected to the demolding position of the template sleeve; wherein one of the negative brushes is connected to the demolding roller and the other negative brush is connected to the impression position of the template sleeve;

[0024] A potential difference is formed at the imprinting point from the imprinting roller to the template roller, and at the demolding point from the template roller to the demolding roller. A visible light cationic initiator is added to the film. The potential difference causes the cationic film to generate an electrostatic adsorption force adhering to the template roller at the imprinting point and an electrostatic repulsion force away from the template roller at the demolding point.

[0025] In summary, this application includes the following beneficial technical effects:

[0026] This invention provides a gas-electric driven method for preparing microstructures on the surface of thin films. The template roller is designed with an internal cavity and has slits to allow the cavity to communicate with the outside. A gas pump is used to create positive and negative pressure in specific areas of the template roller. Simultaneously, a DC power supply is connected to the template roller and the imprinting roller via brushes. Due to the force of charged particles in the electric field, electrostatic adsorption and electrostatic repulsion forces are formed in specific areas of the template roller. The negative pressure area and electrostatic adsorption force make the film adhere more closely to the roller, thereby making the imprinted structure shape and size more complete and improving the microstructure replication rate. The positive pressure area and electrostatic repulsion force push the film away from the template roller, replacing the traditional demolding method and reducing the damage rate of the film structure caused by demolding. Attached Figure Description

[0027] Figure 1 This is an overall structural diagram of the apparatus used in the gas-electric driven thin film surface microstructure preparation method of this application;

[0028] Figure 2 It is about Figure 1 Partial structural diagram of the drive assembly and transmission assembly;

[0029] Figure 3 This is a partial structural diagram of the linkage components;

[0030] Figure 4 It is about Figure 1 Partial structural diagram of the cavity of the air pump;

[0031] Figure 5 It is about Figure 1 Partial structural diagram of the brush in a medium-voltage DC power supply.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Workbench; 2. Heating and screw extrusion assembly;

[0034] 3. Roll-to-roll roller assembly; 31. Template roller; 311. Template sleeve; 312. Roller; 313. Slit; 314. Cavity 1; 315. Cavity 2; 32. Imprinting roller; 33. Demolding roller;

[0035] 4. Drive assembly; 41. Servo motor; 42. Drive shaft; 421. Connecting sleeve; 422. Connecting rod; 43. Drive shaft; 44. Drive pulley; 45. Driven pulley; 46. Drive belt;

[0036] 5. Transmission components; 51. Driving gear; 52. Driven gear; 53. Driven shaft; 54. Linkage shaft; 55. Linkage gear;

[0037] 6. Air pressure control components; 61. Air pump; 62. Air hoses;

[0038] 7. DC electric field device; 71. DC power supply; 72. Positive brush; 73. Negative brush. Detailed Implementation

[0039] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0040] This application discloses a method for preparing gas-electric driven thin film surface microstructures, referencing... Figure 1 and Figure 2 The device includes a worktable 1, on which are mounted a heating and screw extrusion assembly 2, a roll-to-roll roller assembly 3, a transmission assembly 5, a drive assembly 4, a pneumatic control assembly 6, and a DC electric field assembly. The transmission assembly 5 and the drive assembly 4 are used to drive the roll-to-roll roller assembly 3 to rotate. When the film raw material is placed into the heating and screw extrusion assembly 2, the raw material is melted and extruded to form a molten film. Subsequently, the film enters the roll-to-roll roller assembly 3 to complete the printing and demolding process. During this process, the pneumatic control assembly 6 and the DC electric field assembly assist in printing and demolding.

[0041] refer to Figure 1 and Figure 4The roll-to-roll roller assembly 3 includes a template roller 31, an impression roller 32, and a demolding roller 33, all of which are rotatably connected to the worktable 1. The impression roller 32 is above the template roller 31 in the figure, and the demolding roller 33 is located to the right of the template roller 31. The rotation axis of the template roller 31 is perpendicular to the forward direction of the film. The drive assembly 4 drives the roll-to-roll roller assembly 3 to rotate through the transmission assembly 5. The rotation directions of the template roller 31 and the impression roller 32 are opposite. After the molten film is extruded, it passes between the template roller 31 and the impression roller 32. During this process, the film is stretched by the template roller 31 and the impression roller 32 and gradually moves forward to complete the imprinting of the surface microstructure. Then it is wound into the demolding roller 33 again to complete the demolding.

[0042] In this embodiment, the drive assembly 4 includes a servo motor 41, a drive shaft 42, a transmission shaft 43, a drive pulley 44, a driven pulley 45, and a transmission belt 46. The drive shaft 42 is rotatably connected to the worktable 1. The roller 312 is coaxially sleeved on the drive shaft 42 and fixedly connected to the worktable 1. The servo motor 41 is fixedly connected to the worktable 1 by bolts. The transmission shaft 43 is coaxially fixedly connected to the output shaft of the servo motor 41. The drive pulley 44 is fixedly connected to the transmission shaft 43, and the driven pulley 45 is fixedly connected to the drive shaft 42. The transmission belt 46 is meshed and sleeved on the drive pulley 44 and the driven pulley 45. After the servo motor 41 is started, the transmission shaft 43 rotates, driving the drive pulley 44 to rotate, thereby driving the driven pulley 45 to rotate through the transmission belt 46, and finally driving the drive shaft 42 to rotate.

[0043] refer to Figure 2 and Figure 3 In this embodiment, the transmission assembly 5 includes a driving gear 51, a driven gear 52, a driven shaft 53, a linkage shaft 54, and a linkage gear 55. The driving gear 51 is coaxially fixedly connected to the driving shaft 42. The driven shaft 53 is rotatably connected to the worktable 1, and the impression roller 32 is coaxially fixedly connected to the driven shaft 53. The driven gear 52, which meshes with the driving gear 51, is coaxially fixedly connected to the driven shaft 53. The linkage shaft 54 ​​is rotatably connected to the worktable 1, and the demolding roller 33 is coaxially fixedly connected to the linkage shaft 54. The linkage gear 55 is coaxially fixedly connected to the linkage shaft 54 ​​and meshes with the driving gear 51.

[0044] refer to Figure 4 and Figure 5 To enhance the printing effect of the film and facilitate demolding, the template roller is divided into a template sleeve 311 and a roller 312. The roller 312 is sleeved on the drive shaft 42 and fixedly connected to the worktable 1. The template sleeve 311 is sleeved outside the roller 312 and fixedly connected to the drive shaft 42 through a linkage assembly. Therefore, when the motor drives the drive shaft 42 to rotate, the template sleeve 311 rotates while the roller 312 does not rotate.

[0045] In this embodiment, the linkage component includes a connecting sleeve 421 and a connecting rod 422. The connecting sleeve is coaxially fixedly connected to the active rotating shaft 42, and the two ends of the connecting rod 422 are fixedly connected to the connecting sleeve 421 and the connecting rod 422 respectively.

[0046] Cavities 314 and 315 are formed on the roller 312, and are arranged sequentially along the rotation direction of the template sleeve 311. Cavity 314 is close to the impression roller 32 and is located at the impression position of the device. An air pump 61 is also provided on the worktable 1. The air pump 61 draws air into cavity 314 and blows air into cavity 315 through an air pipe 62. Subsequently, multiple slits 313 are provided on the template sleeve 311, and cavities 314 and 315 can be connected to the outer surface of the template sleeve 311 through the slits 313. The film enters the impression in a molten state. When the film is between roller 32 and template roller 31, air pump 61 draws air from cavity 314, thereby creating a negative pressure between the film and template roller 31, which causes the film to be adsorbed onto template roller 31, thus completing the imprinting better and improving the imprinting quality. After the film completes the imprinting and reaches the position of cavity 315, air pump 61 blows air into cavity 315, thereby creating a positive pressure between the film and template roller 31, which blows the film away from template roller 31 to complete demolding. At the same time, since roller 312 does not rotate during this process, air pipe 62 will not tangle.

[0047] To further enhance the imprinting and demolding effects of the device, a linkage shaft 54 ​​is rotatably connected to the worktable 1. A demolding roller 33 is coaxially fixed on the linkage shaft 54. The rotation axis of the demolding roller 33 is consistent with the rotation axis of the template roller, but the two rotate in opposite directions. The demolding roller 33 is located to the right of the template roller 31. After the film is separated from the imprinting roller 32 and the template roller 31, it enters the space between the template roller 31 and the demolding roller 33.

[0048] A DC power supply 71 is also provided on the worktable 1. Visible light cationic generator is added to the raw material of the heating and screw extrusion assembly 2. When the molten film is extruded, it will be positively charged. At the same time, the positive terminal of the DC power supply 71 is connected to two positive brushes 72, and the negative terminal is connected to two negative brushes 73. The positive brushes 72 and negative brushes 73 are fixedly connected to the worktable 1. One positive brush 72 is in contact with the impression roller 32, and the other positive brush 72 is in contact with the demolding position of the template sleeve 311. One negative brush 73 is in contact with the demolding roller 33, and the other negative brush 73 is in contact with the impression position of the template sleeve 311.

[0049] The positive brush 72 is connected to the positive terminal of the DC power supply 71, and the negative brush 73 is connected to the negative terminal of the DC power supply 71. A potential difference is formed at the imprinting point from the imprinting roller 32 to the template roller 31, and at the demolding point from the template roller 31 to the demolding roller 33. A visible light cationic initiator is added to the film. The potential difference causes the cationic film to generate an electrostatic adsorption force adhering to the template roller 31 at the imprinting point and an electrostatic repulsion force away from the template roller 31 at the demolding point. The electrostatic adsorption force at the imprinting point makes the film adhere tightly to the template roller 31, resulting in a more complete imprinted structure and thus improving the forming rate of the structure. At the demolding point, an electrostatic repulsion force away from the template roller 31 is formed to assist demolding, reduce damage such as tearing of the film during demolding, and improve the yield and quality of the cast film.

[0050] The implementation principle of the gas-electric assisted microstructure preparation method for thin film surface in this application is as follows: The template roller 31 is designed with an internal cavity and has a slit 313, which allows the cavity to communicate with the outside. A positive and negative pressure is formed in a specific area on the template roller 31 by an air pump 61. At the same time, a DC power supply 71 is connected to the template roller 31 and the imprinting roller 32 through an electric brush. Due to the force of charged particles in the electric field, electrostatic adsorption and electrostatic repulsion are formed in a specific area of ​​the template roller 31. The negative pressure area and the electrostatic adsorption force make the film adhere more closely to the roller, thereby making the shape and size of the imprinted structure on the film more complete and improving the microstructure replication rate. The positive pressure area and the electrostatic repulsion force push the film away from the template roller 31, replacing the traditional demolding method and reducing the damage rate of the film structure caused by demolding.

[0051] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A method for preparing gas-electric driven thin film surface microstructures, characterized in that: The device used includes a worktable (1), a drive assembly (4), a roll-to-roll roller assembly (3), a transmission assembly (5), a DC electric field device (7), a pneumatic control assembly (6), and a heating and screw extrusion assembly (2) mounted on the worktable (1). The pneumatic control component (6) is installed on the base plate of the workbench (1); the DC electric field device (7) is installed on the upper side plate of the workbench (1); The drive assembly (4) provides power, which drives the roll-to-roll roller assembly (3) to rotate through the transmission assembly (5); The roll-to-roll roller assembly (3) includes a template roller (31), an impression roller (32), and a demolding roller (33). The template roller (31) includes a template sleeve (311) and a roller (312). The air pressure control component (6) includes an air pump (61) and an air pipe (62); the template roller (31) has a cavity one (314) and a cavity two (315), both of which are connected to the surface of the template roller (31) through a slit (313); the cavity one (314) and the cavity two (315) are arranged sequentially along the rotation direction of the template roller (31), and the cavity one (314) is located at the imprinting position of the template roller (31); the air pump (61) is fixedly connected to the workbench (1), and the air pump (61) draws air into the cavity one (314) and blows air into the cavity two (315) through the air pipe (62); The raw material of the heating and screw extrusion assembly (2) contains a visible light cationic generator; the DC electric field device (7) includes a DC power supply (71), two positive brushes (72) and two negative brushes (73), the positive brushes (72) and the negative brushes (73) are fixedly connected to the worktable (1) by a fixing rod, one of the positive brushes (72) is connected to the impression roller (32) and the other positive brush (72) is connected to the demolding position of the template sleeve (311); one of the negative brushes (73) is connected to the demolding roller (33) and the other negative brush (73) is connected to the impression position of the template sleeve (311); The polymer film preparation process is roll-to-roll continuous imprinting; The polymer material is heated and melted at a temperature determined by the polymer melting point. The melted polymer material is made into a film by the screw extrusion assembly, and then pressed and demolded by the roll-to-roll roller assembly (3) to form a film with surface microstructure. During the polymer film imprinting process, a negative pressure adsorption force is formed in the cavity (314) of the template roller (31), and a negative electric field is formed between the template roller (31) and the imprinting roller (32) to provide electrostatic adsorption force, thereby reducing the imprinting pressure and improving the forming rate of surface microtexture; During the demolding process of polymer film, a positive pressure demolding force is formed in the cavity 2 (315) of the template roller (31), and a positive electric field is formed between the template roller (31) and the demolding roller (33), providing electrostatic repulsion force, thereby reducing demolding force and film demolding damage.

2. The method for preparing gas-electric driven thin film surface microstructures according to claim 1, characterized in that: The template roller (31), the imprinting roller (32) and the demolding roller (33) are all rotatably connected to the worktable (1) in parallel, and the three are arranged in a triangular formation. The roller (312) is fixedly connected to the worktable (1), and the template sleeve (311) is coaxially sleeved outside the roller (312); the drive assembly (4) drives the template sleeve (311) to rotate through the linkage assembly. When the drive assembly (4) is started, the template sleeve (311) rotates at the same angular velocity as the imprinting roller (32) via the linkage assembly. The film passes between the template roller (31) and the imprinting roller (32), and the imprinting roller (32) copies the structure on the template roller (31) onto the film by imprinting.

3. The method for preparing gas-electric driven thin film surface microstructures according to claim 2, characterized in that: The drive assembly (4) includes a servo motor (41), a drive shaft (42), a transmission shaft (43), a drive pulley (44), a driven pulley (45), and a transmission belt (46). The drive shaft (42) is rotatably connected to the worktable (1) and is used to drive the template roller (31) to rotate. The servo motor (41) is fixedly connected to the worktable (1) by bolts. The transmission shaft (43) is fixedly connected to the output shaft of the servo motor (41). The drive pulley (44) is fixedly connected to the transmission shaft (43), and the driven pulley (45) is fixedly connected to the drive shaft (42). The transmission belt (46) is engaged and sleeved on the drive pulley (44) and the driven pulley (45).

4. The method for preparing gas-electric driven thin film surface microstructures according to claim 3, characterized in that: The transmission assembly (5) includes a driving gear (51), a driven gear (52), a driven shaft (53), a linkage shaft (54), and a linkage gear (55); the driving gear (51) is coaxially fixedly connected to the driving shaft (42); The driven shaft (53) is rotatably connected to the worktable (1), the embossing roller (32) is coaxially fixedly connected to the driven shaft (53), and a driven gear (52) that meshes with the driving gear (51) is coaxially fixedly connected to the driven shaft (53). The linkage shaft (54) is rotatably connected to the worktable (1), the demolding roller (33) is coaxially fixedly connected to the linkage shaft (54), and the linkage gear (55) is coaxially fixedly connected to the linkage shaft (54) and meshes with the drive gear (51).

5. The method for preparing gas-electric driven thin film surface microstructures according to claim 4, characterized in that: The linkage component includes a connecting rod (422) and a connecting sleeve (421). The connecting sleeve (421) is fixedly connected to the active rotating shaft (42), and the two ends of the connecting rod (422) are fixedly connected to the connecting sleeve (421) and the template sleeve (311) respectively.

6. The method for preparing gas-electric driven thin film surface microstructures according to claim 5, characterized in that: The air pump (61) forms a negative pressure adsorption force on the surface of the microstructure in the cavity one (314) region and a positive pressure demolding force on the surface of the microstructure in the cavity two (315) region, with the pressure range within 0.1 atmospheres, to assist the microstructure imprinting and demolding on the surface of the template roller (31).

7. The method for preparing gas-electric driven thin film surface microstructures according to claim 6, characterized in that: An electric potential difference is formed at the imprinting point from the imprinting roller (32) to the template roller (31), and an electric potential difference is formed at the demolding point from the template roller (31) to the demolding roller (33). A visible light cationic initiator is added to the film. The electric potential difference causes the cationic film to generate an electrostatic adsorption force adhering to the template roller (31) at the imprinting point and an electrostatic repulsion force away from the template roller (31) at the demolding point.

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