Multi-layer film preparation method and multi-layer film
By laminating multilayer films in a wet state and utilizing precise control of the winding assembly, coating assembly, pressing assembly, and drying assembly, the problem of film misalignment during transport, alignment, and pressing processes was solved, achieving stable alignment and high-precision lamination of multilayer films.
Patent Information
- Application Number
- CN202511830777.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-06
- Publication Date
- 2026-01-30
AI Technical Summary
In the process of preparing multilayer thin films, the films are prone to displacement during transportation, alignment and pressing, resulting in inaccurate interlayer alignment, which affects the composite accuracy and product quality.
The first, second, and third films are laminated in a wet state using an adhesive. Through the synergistic action of the winding assembly, coating assembly, pressing assembly, and drying assembly, the tension and travel speed of the films are precisely controlled to ensure that each film layer operates synchronously during the coating, pressing, and drying processes.
It effectively prevents interlayer misalignment caused by uneven tension or speed differences, ensuring stable alignment of the film during the lamination process and improving lamination accuracy and yield.
Smart Images
Figure CN121424751A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of thin film preparation technology, and in particular to a method for preparing multilayer thin films and multilayer thin films. Background Technology
[0002] In multilayer thin film fabrication technology, wet lamination is a commonly used process widely applied in packaging, electronics, optics, and other fields. This method involves coating a substrate surface with an adhesive or functional coating, then laminating another thin film onto it, followed by drying and curing to achieve a multilayer composite structure.
[0003] However, this technology still has certain shortcomings in practical operation. Especially during the film transfer process after coating, because the coating layer is not yet cured, the film is prone to misalignment during transport, alignment, and pressing, leading to inaccurate interlayer alignment and affecting composite accuracy and product quality. Furthermore, misalignment can also cause defects such as bubbles and wrinkles, reducing yield and performance stability. Therefore, a multilayer film preparation method and a multilayer film are proposed. Summary of the Invention
[0004] To address the problem that thin films are prone to misalignment during transport, alignment, and lamination, leading to inaccurate interlayer alignment and affecting composite accuracy and product quality, this application provides a method for preparing multilayer thin films and a multilayer thin film.
[0005] This application provides a method for preparing multilayer thin films and the technical solution adopted by the multilayer thin films as follows:
[0006] A multilayer film includes a first film, a second film, and a third film, which are stacked from top to bottom. An adhesive is disposed between the first film, the second film, and the third film. The adhesive is not water-soluble. The first film, the second film, and the third film are laminated in a wet state by the adhesive.
[0007] A method for preparing a multilayer film includes a base, a winding assembly, a coating assembly, a pressing assembly, and a drying assembly. The unwinding end and the winding end of the winding assembly are disposed on both sides of the upper surface of the base. The winding assembly includes a first vertical plate disposed on both sides of the upper surface of the base. Each of the first vertical plates is provided with a roller. One set of the rollers on the first vertical plate is provided with three sets, which are used for unwinding a first film, a second film, and a third film, respectively. Another set of the rollers on the first vertical plate is used for winding the first film, the second film, and the third film. A motor is fixedly installed on the surface of the first vertical plate located at the winding end. The output shaft of the motor passes through the first vertical plate and is fixedly connected to the roller.
[0008] Furthermore, the coating component includes a second vertical plate fixedly installed on the upper surface of the base. Two sets of glue rollers are arranged vertically on the surface of the second vertical plate. The surface of each glue roller is provided with uniformly distributed through holes, and the outer surface of each glue roller is covered with a sponge sleeve. A glue injection component is provided at one end of each glue roller near the second vertical plate.
[0009] Furthermore, each of the glue injection components includes a connecting pipe fixedly installed at the center of one side of the glue roller. The connecting pipe passes through the second vertical plate and is rotatably connected to it. A glue box is fixedly connected to one end of the connecting pipe on the back side of the second vertical plate. A push plate is slidably and sealingly connected to the inner surface of the glue box. A compression spring is fixedly connected between the side of the push plate away from the second vertical plate and the inner surface of the glue box. A glue injection tube is fixedly connected to the side of the glue box near the second vertical plate. A valve body is provided inside the glue injection tube.
[0010] Furthermore, the pressing assembly includes a slide fixedly installed on the upper surface of the base. Electric push rods are fixedly connected to the top and bottom of the slide. The telescopic ends of the two sets of electric push rods are arranged opposite each other and fixedly connected to sliders. Pressure rollers are rotatably connected to the surface of each slider.
[0011] Furthermore, the drying assembly includes a frame fixedly installed on the upper surface of the base, on which a dryer is fixedly connected. The dryer has two sets of air outlets, which are arranged vertically opposite to each other.
[0012] Furthermore, the coating component, pressing component, and drying component are arranged sequentially from the unwinding end of the winding component to the rewinding end.
[0013] In summary, this application includes the following beneficial technical effects:
[0014] The winding assembly in this invention precisely controls the tension and travel speed of the first, second, and third films during operation, ensuring that each film layer maintains synchronous operation during coating, pressing, and drying. This effectively prevents interlayer misalignment caused by uneven tension or speed differences, ensuring stable alignment of the films during the lamination process. Attached Figure Description
[0015] Fig. 1 This is a schematic diagram of the overall structure of the application embodiment;
[0016] Fig. 2 This is a partial structural schematic diagram of an embodiment of the application;
[0017] Fig. 3 This is a cross-sectional view of the application embodiment's application application application component.
[0018] Explanation of reference numerals in the attached drawings: 1. Base; 2. First vertical plate; 3. Roller component; 4. Motor; 5. Second vertical plate; 6. Rubber roller; 7. Slide block; 8. Frame; 9. Dryer; 10. Electric push rod; 11. Slider; 12. Pressure roller; 13. Sponge sleeve; 14. Connecting pipe; 15. Glue box; 16. Push plate; 17. Compression spring; 18. Glue injection pipe. Detailed Implementation
[0019] The following is in conjunction with the appendix Figs. 1-3 This application will be described in further detail.
[0020] This application discloses a multilayer film, including a first film, a second film, and a third film. The first film, the second film, and the third film are stacked from top to bottom. An adhesive is disposed between the first film, the second film, and the third film. The adhesive is not water-soluble. The first film, the second film, and the third film are laminated in a wet state by the adhesive.
[0021] A method for preparing a multilayer film includes a base 1, a winding assembly, a coating assembly, a pressing assembly, and a drying assembly. The unwinding end and the winding end of the winding assembly are located on both sides of the upper surface of the base 1. The winding assembly includes first vertical plates 2 located on both sides of the upper surface of the base 1. Each first vertical plate 2 is provided with a roller 3. One set of roller 3 on the first vertical plate 2 is provided with three sets, which are used to unwind a first film, a second film, and a third film, respectively. Another set of roller 3 on the first vertical plate 2 is used to wind up the first film, the second film, and the third film. A motor 4 is fixedly installed on the surface of the first vertical plate 2 located at the winding end. The output shaft of the motor 4 passes through the first vertical plate 2 and is fixedly connected to the roller 3. The coating assembly, the pressing assembly, and the drying assembly are arranged sequentially from the unwinding end to the winding end of the winding assembly.
[0022] In this embodiment, during the film lamination operation, the first film, the second film, and the third film are first mounted on three sets of winding rollers 3 at the unwinding end. The films sequentially pass through the coating assembly and the pressing assembly, and finally reach the winding rollers 3 at the rewinding end to complete the lamination and winding process.
[0023] Furthermore, the coating component includes a second vertical plate 5 fixedly installed on the upper surface of the base 1. Two sets of glue rollers 6 are arranged vertically on the surface of the second vertical plate 5. The surface of each glue roller 6 is provided with evenly distributed through holes, and the outer surface of each glue roller 6 is covered with a sponge sleeve 13. A glue injection component is provided at one end of each glue roller 6 near the second vertical plate 5.
[0024] Furthermore, each glue injection assembly includes a connecting pipe 14 fixedly installed at the center of one side of the glue roller 6. The connecting pipe 14 passes through the second vertical plate 5 and is rotatably connected to it. One end of the connecting pipe 14 located on the back of the second vertical plate 5 is fixedly connected to a glue box 15. A push plate 16 is slidably and sealingly connected to the inner surface of the glue box 15. A compression spring 17 is fixedly connected between the side of the push plate 16 away from the second vertical plate 5 and the inner surface of the glue box 15. A glue injection tube 18 is fixedly connected to the side of the glue box 15 close to the second vertical plate 5. A valve body is provided inside the glue injection tube 18.
[0025] In this embodiment, before coating, the valve body is first opened, and adhesive is injected into the glue tank 15 through the glue injection tube 18. Then, the valve body is closed. During the coating process, the compression spring 17 pushes the push plate 16, allowing the adhesive to enter the glue roller 6 through the connecting tube 14 and be evenly distributed onto the sponge sleeve 13 through the through holes on the surface of the glue roller 6. As the film moves, the sponge sleeve 13 evenly coats the adhesive between the first film and the second film, and between the second film and the third film. In addition, a limit ring is provided on the inner surface of the glue tank 15 near the glue injection tube 18 to prevent the push plate 16 from going over the limit ring and blocking the glue injection tube 18.
[0026] Furthermore, the pressing assembly includes a slide 7 fixedly installed on the upper surface of the base 1. Electric push rods 10 are fixedly connected to the top and bottom of the slide 7. The telescopic ends of the two sets of electric push rods 10 are arranged opposite each other and fixedly connected to sliders 11. Pressure rollers 12 are rotatably connected to the surface of the sliders 11.
[0027] Furthermore, the drying assembly includes a frame 8 fixedly installed on the upper surface of the base 1, a dryer 9 fixedly connected to the frame 8, and two sets of air outlets of the dryer 9, which are arranged vertically opposite to each other.
[0028] In this embodiment, the coated film then enters the lamination assembly. The electric push rod 10 is activated to push the slider 11, which in turn drives the pressure roller 12 to apply appropriate pressure to the film, ensuring that the film layers are tightly bonded while wet, thereby improving lamination accuracy and preventing interlayer misalignment. The laminated film continues to the drying assembly, where the two sets of air outlets of the dryer 9 uniformly heat the film from both above and below, allowing the adhesive to cure rapidly and ensuring the stability of the composite structure.
[0029] The winding assembly in this application precisely controls the tension and travel speed of the first, second, and third films during operation, ensuring that each film layer maintains synchronous operation throughout the coating, pressing, and drying processes. This effectively prevents interlayer misalignment caused by uneven tension or speed differences, ensuring stable alignment of the films during lamination. The tension and travel speed of the winding assembly can be controlled by a tension control system and a servo drive system. The tension control system monitors the film tension in real time using a tension sensor and adjusts the unwinding and rewinding resistance using a magnetic powder brake or pneumatic actuator to maintain stable tension. The servo drive system precisely controls the rotation speed of the roller 3 using a high-precision servo motor and controller, ensuring synchronous operation of each film layer and preventing misalignment. The aforementioned tension control system and servo drive system are existing conventional technologies and will not be described in detail here.
[0030] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.
[0031] Secondly: The accompanying drawings of the embodiments disclosed in this invention only involve the structures involved in the embodiments disclosed in this invention. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this invention can be combined with each other.
[0032] In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
[0033] 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 multilayer film comprising a first film, a second film, and a third film, characterized in that, The first film, the second film and the third film are stacked from top to bottom, and an adhesive is arranged between the first film, the second film and the third film, wherein the adhesive is water-insoluble, and the first film, the second film and the third film are compounded in a wet state through the adhesive.
2. A method for manufacturing a multi-layer film, comprising a base (1), a winding assembly, an application assembly, a pressing assembly and a drying assembly, the unwinding end and the winding end of the winding assembly being arranged on both sides of the upper surface of the base (1), characterized in that, The winding assembly comprises first vertical plates (2) arranged on both sides of the upper surface of the base (1), and winding roller elements (3) are arranged on the first vertical plates (2). One group of the winding roller elements (3) on one of the first vertical plates (2) is provided with three groups of winding roller elements (3) for winding the first film, the second film and the third film respectively. The winding roller elements (3) on the other first vertical plate (2) are used for winding the compounded first film, the second film and the third film. A motor (4) is fixedly installed on the surface of the first vertical plate (2) at the winding end. The output shaft of the motor (4) penetrates the first vertical plate (2) and is fixedly connected with the winding roller element (3).
3. The method of claim 2, wherein the step of coextruding the first and second layers is performed by a blown film process. The coating assembly comprises a second vertical plate (5) fixedly installed on the upper surface of the base (1). Two groups of rubber rollers (6) are arranged on the surface of the second vertical plate (5) in the vertical direction. Uniformly distributed through holes are formed in the surface of the rubber rollers (6). Sponge sleeves (13) are sleeved on the outer surfaces of the rubber rollers (6). The rubber rollers (6) are provided with glue injection assemblies at one end close to the second vertical plate (5).
4. The method of claim 3, wherein the step of coextruding the first and second layers is performed by a blown film process. The glue injection assemblies each comprise a connecting pipe (14) fixedly installed at the center of one side of the rubber roller (6). The connecting pipe (14) penetrates the second vertical plate (5) and is rotatably connected with the second vertical plate (5). One end of the connecting pipe (14) located at the back of the second vertical plate (5) is fixedly and penetratively connected with a glue tank (15). A push plate (16) is slidably and sealingly connected with the inner surface of the glue tank (15). A compression spring (17) is fixedly connected between the side, away from the second vertical plate (5), of the push plate (16) and the inner surface of the glue tank (15). A glue injection pipe (18) is fixedly and penetratively connected with the side of the glue tank (15) close to the second vertical plate (5). A valve body is arranged in the glue injection pipe (18).
5. The method of claim 4, wherein the step of coextruding the first and second layers is performed by a blown film process. The pressing assembly comprises a sliding seat (7) fixedly installed on the upper surface of the base (1). Electric push rods (10) are fixedly connected with the inner top and the inner bottom of the sliding seat (7). The extension ends of the two groups of electric push rods (10) are oppositely arranged and fixedly connected with sliding blocks (11). Pressure rollers (12) are rotatably connected with the surfaces of the sliding blocks (11).
6. The method of claim 4, wherein the step of coextruding the first and second layers is performed by a blown film process. The drying assembly comprises a frame body (8) fixedly installed on the upper surface of the base (1). A drying machine (9) is fixedly connected with the frame body (8). Two groups of air outlets of the drying machine (9) are oppositely arranged in the vertical direction.
7. The method of claim 4, wherein the step of coextruding the first and second layers is performed by a blown film process. The coating assembly, the pressing assembly and the drying assembly are sequentially arranged from the unwinding end to the winding end of the winding assembly.