Device and method for manufacturing flexible transparent conductive film through roll-to-roll laser shock

Abstract

The invention discloses a device and method for manufacturing a flexible transparent conductive film through roll-to-roll laser shock, and the device comprises a flowing water conveying mechanism, a flowing water generating mechanism and an optical element. A beam of pulse laser is utilized to generate two beams of pulse light with controllable intensity by utilizing a beam splitting or nonlinear element, the two beams of pulse light are respectively emitted from two surfaces of a to-be-processed film, plasma expansion impact force and plasmon laser heat effect under water flow constraint are synchronously and controllably generated, and welding and flattening of the spatially discrete metal nanowires are realized with high production efficiency. The conductivity and the stability of the metal nanowire are enhanced, and the metal nanowire has wide popularization value and application prospect.

Description

Technical Field

[0001] The present invention relates to the technical field of roll-to-roll thin film manufacturing, and particularly to an apparatus and method for roll-to-roll laser shock manufacturing of flexible transparent conductive films. Background Art

[0002] Transparent conductive films are important components of touch screens, photovoltaic cells, and optical sensors. Currently, there are solutions based on metal nanowire networks, metal grid solutions, and indium tin oxide (ITO) solutions. Among them, indium tin oxide is a brittle material and is not suitable for making flexible transparent conductive electrodes; the metal grid solution requires the use of lithography technology and has a high cost; the transparent conductive thin film technology solution based on metal nanowires has the characteristics of low cost, easy mass production, and flexible expansion, and has attracted great attention in the industrial and academic fields. The welding of metal nanowire networks can improve the conduction ability between different nanowires, enhance the conductivity of the nanowire network and its stability under fatigue loads in flexible scenarios, and is an essential step in the production of metal nanowire transparent conductive films. However, there is a phenomenon of random distribution of nanowires during the laying process of metal nanowire networks, resulting in the situation where two or more nanowires do not actually contact each other. This not only increases the surface roughness but also makes it difficult to achieve welding under the action of pulsed photothermal effects, affecting the comprehensive electrical, optical, and mechanical properties of the film. This is a technical problem that needs to be urgently solved by those skilled in the art.

[0003] The Chinese invention patent (publication number CN115805367B) discloses a metal nanowire impact welding device and method based on the laser thermal-mechanical coupling effect. It effectively heats the node area of metal nanowires through plasmons, and compacts the nanowires by means of the impact effect of pulsed laser under the constraint of a solid constraint layer, shortening the distance between adjacent nanowires, reducing the phenomenon of virtual overlap, strengthening the heating effect, and realizing high-reliability welding operation of spatially staggered nanowires without melting the whole metal nanowires. Laser shock-enabled optical–thermal–mechanical coupled welding method for silver nanowires published in International Journal of Machine Tools and Manufacture also reports on this method. However, this method does not give how to achieve high-efficiency laser shock combined with laser plasmon welding in a roll-to-roll production line mode. During the application of laser impact force, it is necessary to lay a transparent constraint layer and a momentum transfer layer (referred to as a protective layer in the aforementioned patent), and transfer the force through the close fit of the momentum transfer layer and the nanowires; in the roll-to-roll production line mode, the surface of the flexible transparent thin film of metal nanowires to be processed moves at high speed. If there is relative displacement with the momentum transfer layer or the transparent constraint layer, it will frictionally damage the metal nanowire structure and cause functional damage; moreover, the momentum transfer layer and the transparent constraint layer must be applied with high efficiency, high reliability, low cost, and high precision to meet the low-cost roll-to-roll production line application. This results in the current laser thermal-mechanical coupling welding technology not being able to achieve large-scale high-efficiency mass production applications. Therefore, it is necessary to solve the problem of how to simultaneously apply pulsed laser impact force and pulsed laser thermal effect in roll-to-roll high-efficiency production line processing and manufacturing. Summary of the Invention

[0004] The object of the present invention is to provide a device and method for roll-to-roll laser shock manufacturing of flexible transparent conductive films in view of the problems existing in the prior art.

[0005] To achieve the above object, the technical solution adopted by the present invention is as follows: In a first aspect, a device for roll-to-roll laser shock manufacturing of flexible transparent conductive films, the device includes: A first water conveyance mechanism, and a flexible transparent film coated with a metal nanowire layer is conveyed along the first water conveyance mechanism; A second water conveyance mechanism, and a momentum transfer layer coated with a light-absorbing layer is conveyed along the second water conveyance mechanism; The first water conveyance mechanism and the second water conveyance mechanism are arranged close to each other so that there is at least one mutual approach and fitting area between the flexible transparent film and the momentum transfer layer; A water flow generating mechanism arranged on one side of the second water flow conveying mechanism, the water flow generating mechanism forming a water layer in the bonding area; A first light beam scanning element, arranged on one side of the first water flow conveying mechanism and located on the back of the flexible transparent film, the first light beam scanning element forming a heating light output directed towards the bonding area; A second light beam scanning element, arranged on one side of the second water flow conveying mechanism, the second light beam scanning element forming an impact force forming light output directed towards the bonding area.

[0006] With the settings of the first water flow conveying mechanism and the second water flow conveying mechanism, this device can achieve roll-to-roll film assembly line type conveying, which is beneficial to continuous and batch production and processing; at the same time, it can also adjust the running speed and tension degree of the film to meet the requirements of film production and processing. The water flow generating mechanism can wash the bonding part of the flexible transparent film and the momentum transfer layer to form a water layer with a certain thickness, and the water layer can enhance and extend the laser impact force, which is beneficial to improving the laser impact effect.

[0007] Further, the first water flow conveying mechanism includes a first driving wheel and a first driven wheel, and a plurality of first turning wheels arranged between the first driving wheel and the first driven wheel along the water flow conveying direction, and the area between a pair of the first turning wheels corresponds to the bonding area.

[0008] Further, the second water flow conveying mechanism includes a second driving wheel and a second driven wheel, and a plurality of second turning wheels arranged between the second driving wheel and the second driven wheel along the water flow conveying direction, and the area between a pair of the second turning wheels corresponds to the bonding area.

[0009] Further, the metal nanowire layer is coated on the front of the flexible transparent film, and the front of the flexible transparent film faces the momentum transfer layer in the bonding area.

[0010] Further, the momentum transfer layer is a film coated with the light absorbing layer.

[0011] Further, the distance between the flexible transparent film and the momentum transfer layer is less than 20 microns at the bonding area, and the thickness of the momentum transfer layer is less than 1 mm.

[0012] Further, the conveying speeds of the flexible transparent film and the momentum transfer layer are the same at the bonding area.

[0013] Further, the device further includes a beam splitting element or a nonlinear element, which splits a pulsed laser beam into a heating light beam and an impact force forming light beam. The heating light beam is introduced into the first beam scanning element, and the impact force forming light beam is introduced into the second beam scanning element; the pulse width of the pulsed laser is less than 10 milliseconds.

[0014] In some embodiments, the device further includes a first laser generator and a second laser generator. The first laser generator is disposed below the first beam scanning element and is used to generate heating light and inject it into the first beam scanning element. The second laser generator is disposed below the second beam scanning element and is used to generate impact force forming light and inject it into the second beam scanning element.

[0015] In a second aspect, a method for manufacturing a flexible transparent conductive film by roll-to-roll laser shock uses the device for manufacturing a flexible transparent conductive film by roll-to-roll laser shock as described above. The method includes the following steps: Arrange a flexible transparent film coated with a metal nanowire layer on the first water flow conveying mechanism, and the metal nanowire layer is on the front side of the flexible transparent film; Arrange a momentum transfer layer coated with an absorbing layer on the second water flow conveying mechanism. The front side of the flexible transparent film faces the momentum transfer layer, and there is a fitting area where the flexible transparent film and the momentum transfer layer are close to each other; Start and control the first water flow conveying mechanism and the second water flow conveying mechanism to make the linear velocities of the flexible transparent film and the momentum transfer layer consistent in the fitting area; Turn on the water flow generating mechanism to flush the fitting area, and at the same time adjust the tensions of the flexible transparent film and the momentum transfer layer and the tightness in the fitting area to form a water layer with a certain thickness; Split a pulsed laser beam into a heating light beam and an impact force forming light beam, or use a laser generator to generate two synchronous pulsed laser beams as the heating light beam and the impact force forming light beam; the heating light beam forms an outgoing heating light beam through the beam scanning element and is incident into the fitting area from the back side of the flexible transparent film to heat the metal nanowire layer; the impact force forming light beam forms an outgoing impact force forming light beam through the beam scanning element and acts on the absorbing layer to generate plasma expansion under water confinement, thereby generating an impact force; The impact force is enhanced and extended under water layer confinement and acts on the metal nanowire layer through the momentum transfer layer, and is coupled with the heating effect to realize the welding of spatially staggered nanowires; Under the transportation conditions of the first water flow conveying mechanism and the second water flow conveying mechanism, complete the processing of the entire flexible transparent conductive film.

[0016] Further, the method further includes the steps of adjusting the spot size and the spot scanning trajectory of the pulsed laser, and synchronously coupling and loading the output of the heating light and the output of the impact force light onto the bonding area.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The device of the present invention can be preferably applied to the high-efficiency and high-performance production and manufacturing of flexible transparent conductive films, generating a laser impact force effect and a laser thermal effect with controllable intensities respectively by pulsed lasers; realizing the laser impact effect under a constrained state through the water flow constraint driven by gravitational potential energy from top to bottom; realizing the tight bonding between the momentum transfer layer of the laser impact effect and the metal nanowires to be processed on the transparent flexible film through the synergistic action of the acting force of the water flow on the film and the self-tension of the roll-to-roll film; generating a plasma expansion effect by directly acting on the light-absorbing layer with the laser, thereby generating a laser impact force, and under the constraint of the transparent water flow, the laser impact force is enhanced and prolonged; generating a plasmon local heating effect under the coupling action of the laser thermal effect, finally realizing the welding effect of the spatially discrete nanowires at the nodes, reducing the surface roughness of the metal nanowire film for subsequent enhanced coating of two-dimensional materials; 2. Compared with the traditional single-pulse light heating, the present method can realize the plasmon heating effect of spatially discrete and far-apart metal nanowires under the pressing action of the pulsed light impact force, better process the flexible transparent film carrying the spatially discrete and far-apart metal nanowires, enhance its conductivity and reduce its surface roughness, providing a basis for reliable high-performance applications; compared with the existing laser pressure welding methods, the present method realizes the bonding between two films by using the roll-to-roll film tension and the water flow scouring force. After irradiating two pulsed lasers, the plasma expansion impact force is enhanced and prolonged through the water layer, realizing the roll-to-roll high-efficiency pipeline laser impact pressure and heat welding effect, with high production efficiency and realizing large-scale application; 3. In the present method, the plasma impact force is enhanced and prolonged under the constraint of the water layer, acts on the metal nanowires through the momentum transfer layer, and is coupled with the laser plasmon heating effect, shortening the distance between adjacent nanowires, reducing the virtual bridging phenomenon, strengthening the heating effect, and realizing the highly reliable welding operation of the spatially staggered nanowires. Description of the Drawings

[0018] Figure 1 Schematic diagram of a device and a process for manufacturing a flexible transparent conductive film by roll-to-roll laser impact according to the present invention; Figure 2 Schematic diagram of a pulsed laser passing through beam splitting or nonlinear conversion according to the present invention; Figure 3 Schematic diagram of the synchronous action of the impact force and the plasmon laser heating according to the present invention; Figure 4It is a comparison diagram of the relative positions and welding effects of nanowires before, during, and after the implementation of this method. Among them, (a) is a schematic diagram of the position of the nanowires before the implementation of this method, (b) is a schematic diagram of the approaching of the nanowires during the instantaneous process of the implementation of this method, and (c) is a schematic diagram of the welding state of the nanowires after the implementation of this method; Figure 5 It is a schematic diagram of the device for manufacturing a flexible transparent conductive film in Embodiment 4 of the present invention; In the figure: 100, the direction of gravity; 101, a flexible transparent film (coated with metal nanowires); 102, the first driving wheel; 103, the first turning wheel; 104, the first driven wheel; 105, the momentum transfer layer; 106, the second driving wheel; 107, the second driven wheel; 108, the light absorption layer; 109, the water flow generating mechanism; 110, the water layer; 111, the heating light; 112, the first beam scanning element; 113, the output of the heating light; 114, the impact force forming light; 115, the second beam scanning element; 116, the output of the impact force forming light; 117, the pulsed laser; 118, the plasma expansion; 119, the first laser generator; 120, the second laser generator. Detailed implementation manners

[0019] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0020] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "middle", "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Embodiment 1

[0021] As Figure 1 and Figure 2 shown, a roll-to-roll laser shock device for manufacturing a flexible transparent conductive film, the device includes: a first water flow conveying mechanism, and a flexible transparent film 101 coated with a metal nanowire layer is conveyed along the first water flow conveying mechanism; a second water flow conveying mechanism, and a momentum transfer layer 105 coated with a light absorption layer is conveyed along the second water flow conveying mechanism; The first water flow conveying mechanism and the second water flow conveying mechanism are arranged close to each other so that there is at least one overlapping area where the flexible transparent film 101 and the momentum transfer layer 105 are close to each other. A water flow generating mechanism 109 arranged on one side of the second water flow conveying mechanism, and the water flow generating mechanism 109 forms a water layer in the overlapping area. A first beam scanning element 112 is arranged on one side of the first water flow conveying mechanism and on the back of the flexible transparent film 101. A beam of light forms a heating light output that shoots towards the overlapping area after passing through the first beam scanning element 112. A second beam scanning element 115 is arranged on one side of the second water flow conveying mechanism, and another beam of light forms an impact force forming light output that shoots towards the overlapping area after passing through the second beam scanning element 115.

[0022] With the arrangements of the first water flow conveying mechanism and the second water flow conveying mechanism, the device of the present invention can achieve roll-to-roll film assembly line conveying, which is beneficial to continuous and batch production and processing. At the same time, it can also adjust the running speed and tension of the film to meet the requirements of film production and processing.

[0023] The water flow generating mechanism 109 can wash the joint between the flexible transparent film 101 and the momentum transfer layer 105 to form a water layer with a certain thickness, and the water layer can enhance and extend the laser impact force, which is beneficial to improving the laser shock effect.

[0024] The device of the present invention can be preferably applied to the high-efficiency and high-performance production and manufacturing of flexible transparent conductive films. Two beams of a same pulsed laser are split by an optical beam splitting medium or a nonlinear element to respectively generate a laser impact force effect with controllable intensity (the impact force forming light output) and a laser thermal effect (the heating light output); the laser shock effect under a constrained state is realized by the water flow constraint driven by gravitational potential energy from top to bottom; the close fitting of the momentum transfer layer of the laser shock effect and the metal nanowires to be processed on the transparent flexible film is realized by the synergistic action of the acting force of the water flow on the film and the self-tension of the roll-to-roll film; the laser directly acts on the light-absorbing layer through the split beam to generate a plasma expansion effect, thereby generating a laser impact force, and under the constraint of the transparent water flow, the laser impact force is enhanced and extended; through the force transmission of the momentum transfer layer film, it acts on the coated metal nanowire film synchronously with the heating laser split on the other side; the force effect reduces the distance between the spatially discrete nanowires, and under the coupling effect of the laser thermal effect, a local heating effect of surface plasmons is generated, and finally the welding effect of the spatially discrete nanowires at the nodes is realized, reducing the surface roughness of the metal nanowire film for subsequent coating enhancement of two-dimensional materials.

[0025] Further, the first water flow conveying mechanism includes a first driving wheel 102 and a first driven wheel 104, and a plurality of first turning wheels 103 arranged between the first driving wheel 102 and the first driven wheel 104 along the water flow conveying direction, wherein the area between a pair of the first turning wheels 103 corresponds to the fitting area.

[0026] Through the arrangement of the first driving wheel 102, the first driven wheel 104 and the first turning wheels 103, the flexible transparent film 101 can be conveyed smoothly and continuously, and at the same time, the conveying speed of the flexible transparent film 101 can be adjusted, and a fitting area parallel and corresponding to the momentum transfer layer can be formed after turning.

[0027] Further, the second water flow conveying mechanism includes a second driving wheel 106 and a second driven wheel 107, and a plurality of second turning wheels arranged between the second driving wheel 106 and the second driven wheel 107 along the water flow conveying direction, wherein the area between a pair of the second turning wheels corresponds to the fitting area.

[0028] Similarly, through the arrangement of the second driving wheel 106, the second driven wheel 107 and the second turning wheels, the momentum transfer layer 105 can be conveyed smoothly and continuously, and at the same time, the conveying speed of the momentum transfer layer 105 can be adjusted.

[0029] Further, the metal nanowire layer is coated on the front surface of the flexible transparent film 101, and the front surface of the flexible transparent film 101 faces the momentum transfer layer 105 in the fitting area. Such an arrangement can make the metal nanowire layer close to the momentum transfer layer 105, and at the same time, it can avoid the adverse effects of the wheels on the metal nanowires during the conveying of the flexible transparent film.

[0030] The metal nanowire layer is a metal nanowire network, and there is a situation of random distribution of nanowires during the laying process of the metal nanowires. The device and method of the present invention are to improve the welding performance and effect of these nanowires.

[0031] Further, the momentum transfer layer 105 is a film coated with the light absorption layer 108. The light absorption layer 108 is a sacrificial layer with light absorption materials, such as a graphite light absorption layer.

[0032] Further, the distance between the flexible transparent film 101 and the momentum transfer layer 105 is less than 20 microns at the fitting area, so that the two are as closely attached as possible, and the thickness of the momentum transfer layer 105 is less than 1 mm.

[0033] Further, the conveying speeds of the flexible transparent film 101 and the momentum transfer layer 105 at the bonding area are the same, and the conveying directions are also the same, ensuring that the pulsed light on both sides (the heating light output and the impact force forming light output) can act on the same position of the bonding area simultaneously.

[0034] Further, the device further includes a beam splitting element or a nonlinear element, which splits a pulsed laser beam into a heating light 111 and an impact force forming light 114. The heating light 111 is introduced into the first beam scanning element 112, and the impact force forming light 114 is introduced into the second beam scanning element 115; the pulse width of the pulsed laser is less than 10 milliseconds. Embodiment 2

[0035] A roll-to-roll laser shock method for manufacturing a flexible transparent conductive film, which uses the roll-to-roll laser shock device for manufacturing a flexible transparent conductive film as described in Embodiment 1. The method includes the following steps: Arrange the flexible transparent film coated with a metal nanowire layer on the first water flow conveying mechanism, and the metal nanowire layer is on the front side of the flexible transparent film; Arrange the momentum transfer layer coated with an absorbent layer on the second water flow conveying mechanism. The front side of the flexible transparent film faces the momentum transfer layer, and there is a bonding area where the flexible transparent film and the momentum transfer layer approach each other; Start and control the first water flow conveying mechanism and the second water flow conveying mechanism to make the linear velocities of the flexible transparent film and the momentum transfer layer consistent in the bonding area; Turn on the water flow generating mechanism to flush the bonding area, and at the same time adjust the tensions of the flexible transparent film and the momentum transfer layer and the tightness in the bonding area to form a water layer with a certain thickness, such as 0.1 - 50 mm; Split a pulsed laser beam into a heating light and an impact force forming light. The heating light forms a heating light output through the beam scanning element and enters the bonding area from the back side of the flexible transparent film to heat the metal nanowire layer; the impact force forming light forms an impact force forming light output through the beam scanning element and acts on the absorbent layer to generate plasma expansion under water confinement to generate an impact force; The impact force is enhanced and extended under the confinement of the water layer and acts on the metal nanowire layer through the momentum transfer layer, and is coupled with the heating effect to realize the welding of the spatially staggered nanowires; Under the transportation conditions of the first water flow conveying mechanism and the second water flow conveying mechanism, complete the processing of the entire flexible transparent conductive film.

[0036] Further, the method further includes the steps of adjusting the spot size and the spot scanning trajectory of the pulsed laser, and synchronously coupling and loading the heating light output and the impact force light output onto the bonding area.

[0037] Compared with the traditional single-pulse light heating, this method can achieve the plasmon heating effect of metal nanowires that are spatially discretely separated under the pressing action of the pulsed light impact force, better process the flexible transparent film attached to the spatially discretely separated metal nanowires, enhance its conductivity and reduce its surface roughness, providing a basis for reliable high-performance applications; compared with the existing laser pressure welding method, the roll-to-roll film tension and the water flow scouring force are used to achieve the bonding between two films. After irradiating two pulsed lights with beam splitting or nonlinear conversion, the plasma expansion impact force is enhanced and extended through the water layer to achieve the roll-to-roll high-efficiency pipeline laser shock pressure heat welding effect, with high production efficiency and enabling large-scale applications.

[0038] Specifically, as Figure 1-3 shown, 100 is the direction of gravity, vertically downward, and there is a bonding area where the flexible transparent film 101 and the momentum transfer layer 105 approach each other in the direction of gravity. The flexible transparent film 101 made of polyimide coated with metal nanowires is transported in a pipeline through the first driving wheel 102, the first turning wheel 103, and the first driven wheel 104, with the metal nanowires coated on the outside, that is, the right side in the figure; the thin metal aluminum momentum transfer layer 105 is transported in a pipeline through the second driving wheel 106, the second turning wheel, and the second driven wheel 107, and the light-absorbing layer 108 made of graphite is pre-coated on the momentum transfer layer 105; the driving wheels and the driven wheels are controlled to keep the linear velocities of the two film transport lines consistent at the overlapping area, that is, the bonding area; the water flow generating mechanism 109 scours the bonding area between the flexible transparent film 101 and the metal aluminum film momentum transfer layer 105, and at the same time adjusts the tensions of the two films to achieve the tight bonding of the two films and form a water layer 110 with a certain thickness; a pulsed light is divided into a plasmon heating light (the heating light 111) and an impact force forming light 114 through a beam splitting or nonlinear element; the heating light 111 forms a plasmon heating light output (the heating light output 113) through the galvanometer of the first beam scanning element 112 and is incident on the metal nanowire network from the back of the polyimide flexible transparent film; the impact force forming light 114 forms an impact force forming light output 116 through the galvanometer of the second beam scanning element 115 and acts on the light-absorbing layer 108 to generate a plasma expansion 118 under water confinement (see Figure 3), thereby generating an impact force; realizing the synchronous coupling loading of the laser impact force and the plasmon laser heating in the roll-to-roll motion state, instantaneously generating plasmon local node heating by shortening the distance between discrete nanowires through the impact force, and finally realizing the welding and flattening of the nanowires. Adjust the spot size and the spot scanning trajectory of the pulsed laser, and at the same time, under the condition of thin-film pipeline transportation, realize the processing of the entire thin film.

[0039] From Figure 4 It can be seen that for the polyimide flexible transparent thin film processed by this method, adjacent nanowires can be effectively welded together, reducing the phenomenon of virtual overlap and realizing the highly reliable welding operation of spatially staggered nanowires. Example 3

[0040] The processing method of the polyethylene terephthalate (PET) flexible transparent thin film coated with metal nanowires is as follows: It is transported through the first driving wheel 102, the first turning wheel 103, and the first driven wheel 104 to realize pipeline transportation, and the metal nanowires are coated on the outside; the thin momentum transfer layer 105 is transported through the second driving wheel 106, the second turning wheel, and the second driven wheel 107, and the light-absorbing layer 108 is pre-coated on the momentum transfer layer 105; control these driving wheels and driven wheels so that the two thin-film transportation lines maintain the same linear velocity at the joint; the water flow generating mechanism 109 flushes the joint of the flexible transparent thin film 101 and the momentum transfer layer 105, and at the same time adjusts the tension between the two to realize their close fitting and form a water layer 110 with a certain thickness; a pulsed light beam is divided into a plasmon heating light and an impact force forming light 114 through a beam splitting or nonlinear element; the heating light 111 forms the plasmon heating light output through the galvanometer of the first beam scanning element 112 and is incident on the metal nanowire network from the back of the polyimide flexible transparent thin film; the impact force forming light 114 forms the impact force forming light output 116 through the galvanometer of the second beam scanning element 115 and acts on the light-absorbing layer 108 to generate plasma expansion 118 under water confinement, thereby generating an impact force; realizing the synchronous coupling loading of the laser impact force and the plasmon laser heating in the roll-to-roll motion state, instantaneously generating plasmon local node heating by shortening the distance between discrete nanowires through the impact force, and finally realizing the welding and flattening of the nanowires. Example 4

[0041] The difference between this example and Example 1 lies in the different acquisition methods of the heating light and the impact force forming light.

[0042] Specifically, as Figure 5As shown, a first laser generator 119 and a second laser generator 120 are provided in the present device. The first laser generator 119 is arranged below the first beam scanning element 112 and is used to generate heating light 111 and inject it into the first beam scanning element 112. The second laser generator 120 is arranged below the second beam scanning element 115 and is used to generate impact force forming light 114 and inject it into the second beam scanning element 115. That is, two pulsed lasers generated synchronously by two software-controlled laser generators respectively generate a laser impact force effect and a laser thermal effect with controllable intensities.

[0043] Compared with the method of splitting two beams of a single pulsed laser in Embodiment 1 of this embodiment, the pulsed lasers respectively generated by the two laser generators do not need to pass through complex optical splitting media or nonlinear elements, which can reduce the energy loss during the beam propagation process. At the same time, using software to control the two laser generators to generate pulsed lasers synchronously can control the synchronous application of the laser impact force effect and the laser thermal effect.

[0044] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A roll-to-roll laser shock manufacturing device for a flexible transparent conductive film, characterized in that: The device comprises: a first water flow conveying mechanism, along which the flexible transparent film coated with the metal nanowire layer is conveyed; a second water flow conveying mechanism, along which the momentum transfer layer coated with the light absorbing layer is conveyed; The first water flow conveying mechanism and the second water flow conveying mechanism are arranged close to each other, so that the flexible transparent film and the momentum transfer layer have at least a close contact area; A water flow generating mechanism disposed on one side of the second water flow conveying mechanism, the water flow generating mechanism forming a water layer in the laminating area; A first light beam scanning element is disposed on one side of the first water flow conveying mechanism and is located on the back side of the flexible transparent film, and the first light beam scanning element forms a heating light output toward the laminating area; The second light beam scanning element is disposed at one side of the second water flow conveying mechanism, and the second light beam scanning element forms an impact force toward the bonding area to form light.

2. The device for manufacturing a flexible transparent conductive film by roll-to-roll laser shock according to claim 1, characterized in that: The first water conveying mechanism includes a first driving wheel and a first driven wheel, and a plurality of first steering wheels arranged between the first driving wheel and the first driven wheel along the water conveying direction, wherein an area between a pair of the first steering wheels corresponds to the bonding area.

3. The device for manufacturing a flexible transparent conductive film by roll-to-roll laser shock according to claim 1, characterized in that: The second water conveying mechanism includes a second driving wheel and a second driven wheel, and a plurality of second steering wheels arranged between the second driving wheel and the second driven wheel along the water conveying direction, wherein an area between a pair of the second steering wheels corresponds to the bonding area.

4. The device for manufacturing a flexible transparent conductive film by roll-to-roll laser shock processing according to claim 1, characterized in that: The metal nanowire layer is coated on the front side of the flexible transparent film, and the front side of the flexible transparent film in the bonding area faces the momentum transport layer.

5. The device for manufacturing a flexible transparent conductive film by roll-to-roll laser shock processing according to claim 1, characterized in that: The momentum transport layer is a thin film coated with the light absorbing layer.

6. The device for manufacturing a flexible transparent conductive film by roll-to-roll laser shock according to claim 1, characterized in that: The distance between the flexible transparent film and the momentum transport layer is less than 20 micrometers in the bonding area, and the thickness of the momentum transport layer is less than 1 millimeter.

7. The device for manufacturing a flexible transparent conductive film by roll-to-roll laser shock according to claim 1, characterized in that: The flexible transparent film and the momentum transport layer have the same transport speed at the contact area.

8. The device for manufacturing a flexible transparent conductive film by roll-to-roll laser shock according to claim 1, characterized in that: The device further comprises a beam splitter or a nonlinear element, which splits a beam of pulsed laser into a heating light and an impact force forming light, wherein the heating light is introduced into the first beam scanning element, and the impact force forming light is introduced into the second beam scanning element, and the pulse width of the pulsed laser is less than 10 milliseconds; Alternatively, the device also includes a first laser generator and a second laser generator, wherein the first laser generator is disposed below the first light beam scanning element and is used to generate heating light to be injected into the first light beam scanning element, and the second laser generator is disposed below the second light beam scanning element and is used to generate impact force forming light to be injected into the second light beam scanning element.

9. A roll-to-roll laser shock method for manufacturing a flexible transparent conductive film, characterized in that: The method uses the roll-to-roll laser shock manufacturing device for flexible transparent conductive film according to any one of claims 1 to 8, and the method comprises the following steps: Arranging a flexible transparent film coated with a metal nanowire layer on the first water flow conveying mechanism, wherein the metal nanowire layer is located on the front side of the flexible transparent film; Arranging a momentum transfer layer coated with a light absorbing layer on the second water conveying mechanism, with the front side of the flexible transparent film facing the momentum transfer layer, and a close fitting area between the flexible transparent film and the momentum transfer layer; Starting and controlling the first water flow conveying mechanism and the second water flow conveying mechanism to allow the flexible transparent film and the momentum transfer layer to maintain a consistent linear speed in the laminating area; Turning on the water flow generating mechanism to flush the fitting area, while adjusting the tension between the flexible transparent film and the momentum transfer layer, as well as the degree of adhesion in the fitting area, to form a water layer of a certain thickness; A pulsed laser beam is divided into a heating light and an impact force forming light, or a laser generator is used to generate two synchronous pulsed laser beams as the heating light and the impact force forming light; the heating light is formed into a heating light output through a beam scanning element, and is injected into the bonding area from the back side of the flexible transparent film to heat the metal nanowire layer; the impact force forming light is formed into an impact force forming light output through a beam scanning element, and acts on the light absorbing layer to generate plasma expansion under water confinement, thereby generating an impact force; The impact force is enhanced and prolonged under the constraint of the water layer, acts on the metal nanowire layer through the momentum transfer layer, and couples with the heating effect to achieve the welding of the spatially staggered nanowires; Under the transportation conditions of the first water flow conveying mechanism and the second water flow conveying mechanism, the processing of the entire flexible transparent conductive film is completed.

10. The method for manufacturing a flexible transparent conductive film by roll-to-roll laser shock according to claim 9, characterized in that: The method also includes the steps of adjusting the spot size and the spot scanning trajectory of the pulse laser, and the heating light output and the impact force forming light output are synchronously coupled and loaded on the bonding area.

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