A multi-layer light control film hot compounding device

Abstract

This utility model relates to the field of thermal lamination technology, specifically to a multilayer dimming film thermal lamination device, comprising: a thermal lamination mechanism; an unwinding mechanism for carrying raw material rolls and providing raw materials to the thermal lamination mechanism; a preheating module disposed between the thermal lamination mechanism and the unwinding mechanism for preheating the raw materials flowing to the thermal lamination mechanism; and a winding module disposed at the discharge end of the thermal lamination mechanism. By setting up preheating and heat dissipation modules connected front and rear and constructing a closed-loop thermal energy circulation system, the device effectively solves the problems of film quality defects and excessive energy consumption caused by sudden temperature changes in the prior art. The device adopts a progressive preheating and progressive heat dissipation process, which significantly improves the flatness and optical uniformity of the composite film. At the same time, by prioritizing the supply of waste heat from the high-temperature heat dissipation area to the high-temperature preheating station and supplying the cooled waste heat to the low-temperature preheating station in a tiered utilization method, the device achieves precise matching and efficient recovery of thermal energy quality.

Description

Technical Field

[0001] This utility model relates to the field of thermal composite technology, specifically to a multilayer dimming film thermal composite device. Background Technology

[0002] As a novel type of functional film, dimming film typically requires the lamination of multiple film layers of different materials through a hot-pressing process during its preparation. Existing equipment for the hot lamination of such films usually includes basic mechanisms such as unwinding, hot lamination, and rewinding.

[0003] However, in actual production, existing equipment generally suffers from the following technical defects: First, the raw material film layer lacks effective preheating before entering the lamination mechanism, or the preheating method is crude, often using direct heating at a single temperature. This causes internal stress in the film material due to a sudden temperature rise, affecting the lamination uniformity and the optical performance of the finished product. Second, after thermal lamination, the cooling of the finished film often relies on simple ambient natural cooling or single-stage cooling roller cooling, resulting in low cooling efficiency and uneven rates. This easily leads to quality defects such as warping and wrinkles in the film layer due to inconsistent cooling shrinkage. In addition, the aforementioned independent heating and cooling processes result in a large amount of heat energy waste, leading to high equipment energy consumption. Although some technologies have attempted to introduce waste heat recovery, these are often structurally complex and fail to achieve precise matching between heat energy and process requirements. For example, they fail to prioritize the use of waste heat from high-temperature heat dissipation areas for high-temperature preheating stations, resulting in waste of heat energy quality and limited improvement in overall energy efficiency.

[0004] Therefore, developing a multilayer dimming film thermal lamination device that can achieve progressive temperature control, effectively improve product quality, and significantly reduce energy consumption has become an urgent technical problem to be solved in this field. Utility Model Content

[0005] The purpose of this invention is to provide a multilayer dimming film thermal lamination device to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a multilayer dimming film thermal lamination device, comprising:

[0007] Thermal composite mechanism;

[0008] The unwinding mechanism is used to carry the raw material roll and provide raw materials to the thermal bonding mechanism;

[0009] The preheating module is located between the thermal bonding mechanism and the unwinding mechanism and is used to preheat the raw materials flowing to the thermal bonding mechanism.

[0010] The winding module is located at the discharge end of the thermal bonding mechanism;

[0011] A heat dissipation module, mounted on the winding module, is used to dissipate heat from the finished film after thermal lamination.

[0012] And, a thermal energy circulation system connecting the preheating module and the heat dissipation module;

[0013] The preheating module includes a mounting frame and multiple preheating rollers mounted on the mounting frame. The multiple preheating rollers are divided into a first preheating roller group for preliminary preheating and a second preheating roller group for secondary preheating along the raw material travel path.

[0014] The heat dissipation module includes multiple heat dissipation rollers mounted on the winding module. These multiple heat dissipation rollers are divided into a first heat dissipation roller group for initial heat dissipation and a second heat dissipation roller group for secondary heat dissipation along the finished film's travel path.

[0015] The thermal energy circulation system includes a heat storage tank, a cooling device, and a circulation pump. The circulation pump drives the heat transfer medium to circulate along a preset path, so that the heat transfer medium that absorbs heat from the heat dissipation module flows through the preheating module to provide heat, and then flows through the cooling device to cool down before flowing back to the heat dissipation module.

[0016] Specifically, by setting up a preheating module and a heat dissipation module, and connecting the two using a thermal energy circulation system, the waste heat absorbed by the heat dissipation module from the finished film is creatively used to preheat the raw materials, realizing the tiered recycling of heat and significantly reducing equipment energy consumption. At the same time, the preheating module performs graded preheating through the first and second preheating roller groups, and the heat dissipation module performs graded heat dissipation through the first and second heat dissipation roller groups, so that the raw materials and the finished film undergo a gradual temperature change process, effectively avoiding product deformation or performance damage caused by sudden temperature changes. Thus, while saving energy and reducing consumption, the thermal lamination quality of the multilayer dimming film is guaranteed and improved.

[0017] Preferably, the preset heat transfer medium circulation path is as follows: the heat transfer medium flows sequentially through the first heat dissipation roller group, the second preheating roller group, the first preheating roller group, the cooling equipment, the second heat dissipation roller group, and finally flows back to the first heat dissipation roller group.

[0018] Specifically, by directly supplying the hottest heat-conducting medium from the first heat dissipation roller group to the second preheating roller group, which requires a higher preheating temperature, the precise matching and efficient utilization of the highest quality thermal energy is achieved. Subsequently, the cooled medium flows through the first preheating roller group to preheat the raw materials, completing the cascade utilization of thermal energy and significantly improving energy utilization efficiency. After being fully cooled by the cooling equipment, the medium first flows through the second heat dissipation roller group, which requires efficient heat dissipation, and then flows back to the first heat dissipation roller group with the highest heat load. This sequence ensures that the finished film obtains the strongest cooling effect in the key heat dissipation area, and also ensures the stable and efficient operation of the entire thermal energy circulation system through reasonable flow channel design.

[0019] Preferably, the heat storage tank is located on the connecting pipeline between the first heat dissipation roller group and the second preheating roller group, and a heater for auxiliary heating of the heat transfer medium is provided inside the heat storage tank.

[0020] Specifically, a heat storage tank is placed in the high-temperature medium loop between the first heat dissipation roller group and the second preheating roller group, and a built-in heater is installed. As a heat buffer and storage unit, the heat storage tank can effectively mitigate changes in system heat supply and demand caused by fluctuations in the production process, ensuring a stable heat source for the second preheating roller group. The built-in heater can provide timely auxiliary heating to the heat transfer medium during equipment startup or when the heat recovered from the first heat dissipation roller group is insufficient to meet the high-temperature requirements of the second preheating roller group, ensuring the accuracy and stability of the preheating temperature. This greatly improves the adaptability and reliability of the entire thermal energy cycle system under different operating conditions, ensuring the uniformity of product quality.

[0021] Preferably, the preheating roller includes an inner shaft, a heat-conducting sleeve sleeved outside the inner shaft, and a roller sleeve sleeved outside the heat-conducting sleeve;

[0022] The inner wall of the roller sleeve has multiple grooves along the axial direction, and electric heating wires are installed in the grooves;

[0023] A spiral cooling channel is provided between the heat-conducting sleeve and the inner shaft;

[0024] The inner shaft and the heat-conducting sleeve are equipped with adapter pipes at both ends for the inflow and outflow of the heat-conducting medium.

[0025] Specifically, by integrating the electric heating wire into the groove of the roller sleeve and independently setting a spiral cooling channel inside, the system creatively achieves the combined and decoupled control of two heating modes: active electric heating and medium circulation heat exchange. This allows the preheating roller to achieve rapid and precise heating and temperature compensation through the electric heating wire, while also efficiently and stably utilizing the waste heat recovered by the system through the heat-conducting medium circulating in the cooling channel. Furthermore, the heat-conducting sleeve ensures that the heat is evenly transferred to the roller surface. This greatly improves the temperature control accuracy, response speed, and flexibility of heat energy utilization in the preheating process, providing core hardware support for ensuring the progressive preheating process of multilayer films.

[0026] Preferably, the heat dissipation roller adopts the same roller body base structure as the preheating roller, but omits the grooves and the electric heating wires disposed therein.

[0027] Preferably, the number of preheating rollers in both the first and second preheating roller groups is at least one.

[0028] Preferably, the number of heat dissipation rollers in the first heat dissipation roller group and the second heat dissipation roller group is at least one.

[0029] Preferably, the cooling device can be any one or more combinations of water cooling, air cooling, or semiconductor refrigeration.

[0030] Specifically, it provides a highly flexible and adaptable cooling solution for the entire thermal energy cycle system, enabling the equipment to be optimally configured according to different production environments, energy consumption costs, and control precision requirements. For example, it can utilize efficient water cooling devices to meet the strong cooling needs of large-scale continuous production, or adopt simple air cooling devices to reduce equipment complexity and maintenance costs. It can also choose semiconductor cooling devices with precise temperature control to cope with the stringent processes of high-quality film production, or even achieve more intelligent and reliable temperature control through the combination of multiple devices, thereby significantly improving the adaptability and market competitiveness of the thermal composite equipment in different application scenarios.

[0031] To achieve precise and stable temperature control during the thermal lamination process of multilayer dimming films, this utility model integrates the following multi-level, composite control scheme:

[0032] 1. Staged temperature control logic:

[0033] The core control concept of this invention lies in the "tiered utilization and matching of heat." The system, through a preset circulation path, guides the highest-temperature heat-conducting medium from the first heat dissipation roller group to the second preheating roller group, which has the highest required temperature, thus achieving precise supply of high-temperature heat energy. Subsequently, the cooled medium is supplied to the first preheating roller group, which has a lower required temperature, realizing tiered utilization of heat energy. On the heat dissipation side, the medium, after being deeply cooled by the cooling equipment, first flows to the second heat dissipation roller group, which has a stronger heat dissipation demand, and then flows to the first heat dissipation roller group. This inherent path design itself constitutes a macroscopic, passive, and stable control based on energy grade.

[0034] 2. Active temperature compensation and regulation mechanism:

[0035] Precise temperature control of the preheating module: Each preheating roller integrates an independent electric heating wire. Temperature sensors are installed on the mounting frame or at key stations near the preheating roller. The system is electrically connected to a central controller. The controller receives feedback signals from the temperature sensors and compares them with a preset process temperature curve. When the waste heat recovered by the system is insufficient to raise the surface temperature of the preheating roller to the preset value, the controller drives the corresponding electric heating wire to operate, performing rapid and precise power compensation to ensure a constant preheating temperature.

[0036] Forced cooling regulation of the heat dissipation module: The cooling power of the cooling equipment is adjustable. By adjusting the cooling water flow rate or temperature, the lower limit of the temperature of the heat-conducting medium entering the second heat dissipation roller group can be directly controlled, thereby achieving precise control of the final cooling intensity of the finished film.

[0037] Heater for the thermal storage tank: This heater is controlled by a temperature sensor located at the outlet of the thermal storage tank or the inlet of the second preheating roller assembly. When the equipment starts up or the production process is adjusted, resulting in a severe shortage of recovered heat, the heater activates, raising the heat transfer medium flowing to the second preheating roller assembly to the high-temperature range required by the process, thus ensuring the process stability of the system under unsteady conditions.

[0038] 3. System Integration and Control Mode:

[0039] All the aforementioned temperature sensors, heating wires, control valves / switches of the cooling equipment, circulating pumps, and heaters are connected to the same central controller. The controller contains pre-stored process formulas for different products.

[0040] Compared with the prior art, this utility model provides a multilayer dimming film thermal lamination device, which has the following beneficial effects:

[0041] By setting up preheating and heat dissipation modules that are connected before and after and constructing a closed-loop thermal energy circulation system, the problems of membrane material quality defects and excessive energy consumption caused by sudden temperature changes in the existing technology are effectively solved. The progressive preheating and heat dissipation process significantly improves the flatness and optical uniformity of the composite membrane. At the same time, by prioritizing the supply of waste heat from the high-temperature heat dissipation area to the high-temperature preheating station and supplying the waste heat after cooling to the low-temperature preheating station, the system achieves precise matching and efficient recovery of thermal energy quality. Ultimately, it significantly reduces equipment energy consumption while ensuring stable and reliable finished product quality. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 This is a schematic diagram of the front structure of this utility model;

[0044] Figure 2 This is an exploded view of the preheating roller of this utility model;

[0045] Figure 3 This is a schematic diagram of the preheating roller structure of this utility model;

[0046] Figure 4 This is a side longitudinal section view of the preheating roller of this utility model;

[0047] Figure 5 This is a schematic diagram showing the usage status of the preheating module and the heat dissipation module of this utility model.

[0048] In the diagram: 10, thermal bonding mechanism; 20, unwinding mechanism; 30, preheating module; 310, mounting frame; 320, preheating roller; 321, inner shaft; 322, heat-conducting sleeve; 323, roller sleeve; 324, groove; 325, electric heating wire; 326, cooling channel; 327, adapter pipe; 330, first preheating roller group; 340, second preheating roller group; 40, winding module; 50, heat dissipation module; 510, heat dissipation roller; 520, first heat dissipation roller group; 530, second heat dissipation roller group; 60, heat storage tank; 610, heater; 70, cooling equipment; 80, circulating pump. Detailed Implementation

[0049] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0050] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0051] Example:

[0052] Please see Figures 1-5 This utility model provides a technical solution: a multilayer dimming film thermal lamination device, comprising:

[0053] Thermal composite mechanism 10;

[0054] The unwinding mechanism 20 is used to carry the raw material roll and provide raw materials to the thermal bonding mechanism 10;

[0055] The preheating module 30 is disposed between the thermal bonding mechanism 10 and the unwinding mechanism 20 and is used to preheat the raw materials flowing to the thermal bonding mechanism 10.

[0056] The winding module 40 is located at the discharge end of the thermal bonding mechanism 10;

[0057] A heat dissipation module 50 is mounted on the winding module 40 and is used to dissipate heat from the finished film after thermal lamination.

[0058] And a thermal energy circulation system connecting the preheating module 30 and the heat dissipation module 50;

[0059] The preheating module 30 includes a mounting frame 310 and multiple preheating rollers 320 disposed on the mounting frame 310. The multiple preheating rollers 320 are divided into a first preheating roller group 330 for preliminary preheating and a second preheating roller group 340 for secondary preheating along the raw material travel path.

[0060] The heat dissipation module 50 includes multiple heat dissipation rollers 510 disposed on the winding module 40. The multiple heat dissipation rollers 510 are divided into a first heat dissipation roller group 520 for initial heat dissipation and a second heat dissipation roller group 530 for secondary heat dissipation along the finished film travel path.

[0061] The thermal energy circulation system includes a heat storage tank 60, a cooling device 70, and a circulation pump 80. The circulation pump 80 drives the heat transfer medium to circulate along a preset path, so that the heat transfer medium that absorbs heat from the heat dissipation module 50 flows through the preheating module 30 to provide heat, and then flows through the cooling device 70 to cool down before flowing back to the heat dissipation module 50.

[0062] Specifically, by setting up a preheating module 30 and a heat dissipation module 50, and connecting the two using a thermal energy circulation system, the waste heat absorbed by the heat dissipation module 50 from the finished film is creatively used to preheat the raw materials, realizing the tiered recycling of heat and significantly reducing equipment energy consumption. At the same time, the preheating module 30 performs graded preheating through the first preheating roller group 330 and the second preheating roller group 340, and the heat dissipation module 50 performs graded heat dissipation through the first heat dissipation roller group 520 and the second heat dissipation roller group 530, so that the raw materials and the finished film undergo a gradual temperature change process, effectively avoiding product deformation or performance damage caused by sudden temperature changes, thereby ensuring and improving the thermal composite quality of the multilayer dimming film while saving energy and reducing consumption.

[0063] Preferably, the preset heat transfer medium circulation path is as follows: the heat transfer medium flows sequentially through the first heat dissipation roller group 520, the second preheating roller group 340, the first preheating roller group 330, the cooling device 70, the second heat dissipation roller group 530, and finally flows back to the first heat dissipation roller group 520.

[0064] Specifically, by directly supplying the hottest heat-conducting medium from the first heat dissipation roller group 520 to the second preheating roller group 340, which requires a higher preheating temperature, the precise matching and efficient utilization of the highest quality thermal energy is achieved. Subsequently, the medium with a lower temperature flows through the first preheating roller group 330 to preheat the raw materials, completing the cascade utilization of thermal energy and significantly improving energy utilization efficiency. After that, the medium is fully cooled by the cooling equipment 70, and then flows through the second heat dissipation roller group 530, which requires efficient heat dissipation, and then flows back to the first heat dissipation roller group 520 with the highest heat load. This sequence ensures that the finished film obtains the strongest cooling effect in the key heat dissipation area, and also ensures the stable and efficient operation of the entire thermal energy circulation system through reasonable flow channel design.

[0065] Preferably, the heat storage tank 60 is disposed on the connecting pipeline between the first heat dissipation roller group 520 and the second preheating roller group 340, and the heat storage tank 60 is provided with a heater 610 for auxiliary heating of the heat transfer medium.

[0066] Specifically, the heat storage tank 60 is placed in the high-temperature medium circuit between the first heat dissipation roller group 520 and the second preheating roller group 340, and a built-in heater 610 is installed. The heat storage tank 60 acts as a heat buffer and storage unit, which can effectively suppress the changes in system heat supply and demand caused by fluctuations in the production process and ensure the stability of the heat source supplied to the second preheating roller group 340. The built-in heater 610 can provide timely auxiliary heating to the heat transfer medium during the equipment start-up phase or when the heat recovered from the first heat dissipation roller group 520 is insufficient to meet the high-temperature requirements of the second preheating roller group 340, ensuring the accuracy and stability of the preheating temperature. This greatly improves the adaptability and reliability of the entire thermal energy cycle system under different operating conditions and ensures the uniformity of product quality.

[0067] Preferably, the preheating roller 320 includes an inner shaft 321, a heat-conducting sleeve 322 sleeved outside the inner shaft 321, and a roller sleeve 323 sleeved outside the heat-conducting sleeve 322.

[0068] The inner wall of the roller sleeve 323 has multiple grooves 324 along the axial direction, and an electric heating wire 325 is provided in the grooves 324;

[0069] A spiral cooling channel 326 is provided between the heat-conducting sleeve 322 and the inner shaft 321;

[0070] The inner shaft 321 and the heat-conducting sleeve 322 are provided with adapter pipes 327 at both ends for the inflow and outflow of heat-conducting medium.

[0071] Specifically, by integrating the electric heating wire 325 into the groove 324 of the roller sleeve 323, and independently setting a spiral cooling channel 326 inside, the composite and decoupled control of two heating modes, active electric heating and medium circulation heat exchange, is creatively achieved. This allows the preheating roller 320 to achieve rapid and precise heating and temperature compensation through the electric heating wire 325, and to efficiently and stably utilize the waste heat recovered by the system through the circulating heat-conducting medium in the cooling channel 326. The heat-conducting sleeve 322 ensures that the heat is evenly transferred to the roller surface, thereby greatly improving the temperature control accuracy, response speed and flexibility of heat energy utilization in the preheating process, and providing core hardware support for ensuring the progressive preheating process of multilayer films.

[0072] Preferably, the heat dissipation roller 510 adopts the same roller body base structure as the preheating roller 320, but omits the groove 324 and the electric heating wire 325 disposed therein.

[0073] Preferably, the number of preheating rollers 320 in the first preheating roller group 330 and the second preheating roller group 340 is at least one.

[0074] Preferably, the number of heat dissipation rollers 510 in the first heat dissipation roller group 520 and the second heat dissipation roller group 530 is at least one.

[0075] Preferably, the cooling device 70 can be any one or more combinations of a water-cooling device, an air-cooling device, or a semiconductor refrigeration device.

[0076] Specifically, it provides a highly flexible and adaptable cooling solution for the entire thermal energy cycle system, enabling the equipment to be optimally configured according to different production environments, energy consumption costs, and control precision requirements. For example, it can utilize efficient water cooling devices to meet the strong cooling needs of large-scale continuous production, or adopt simple air cooling devices to reduce equipment complexity and maintenance costs. It can also choose semiconductor cooling devices with precise temperature control to cope with the stringent processes of high-quality film production, or even achieve more intelligent and reliable temperature control through the combination of multiple devices, thereby significantly improving the adaptability and market competitiveness of the thermal composite equipment in different application scenarios.

[0077] Working principle: During operation, the unwinding mechanism 20 conveys the raw material through the preheating module 30 for progressive preheating. The first preheating roller group 330 performs initial preheating, followed by a second preheating roller group 340 before the material enters the thermal lamination mechanism 10 for lamination. The finished film then enters the winding module 40, where it undergoes progressive heat dissipation through the heat dissipation module 50. Initial heat dissipation occurs through the first heat dissipation roller group 520, followed by a second heat dissipation roller group 530. Simultaneously, the thermal energy circulation system drives the heat transfer medium along a specific path. Circulation: The highest temperature medium absorbed from the first heat dissipation roller group 520 is preferentially supplied to the second preheating roller group 340, and then the cooled medium is supplied to the first preheating roller group 330. The medium that has completed the waste heat utilization then flows through the cooling device 70 to be cooled, and then flows through the second heat dissipation roller group 530 and the first heat dissipation roller group 520 in sequence to reabsorb heat. This process realizes the cascade and recycling of thermal energy, and the heat storage tank 60 and its heater 610 and the electric heating wire 325 in the preheating roller 320 jointly ensure the stability and precise control of the system heat.

[0078] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A multi-layer light control film thermal lamination apparatus, characterized by, include: Thermal composite mechanism (10); An unwinding mechanism (20) is used to carry the raw material roll and provide raw materials to the thermal bonding mechanism (10); A preheating module (30) is disposed between the thermal bonding mechanism (10) and the unwinding mechanism (20) for preheating the raw materials flowing to the thermal bonding mechanism (10); A winding module (40) is disposed at the discharge end of the thermal bonding mechanism (10); A heat dissipation module (50) is disposed on the winding module (40) and is used to dissipate heat from the finished film after thermal lamination. And a thermal energy circulation system connecting the preheating module (30) and the heat dissipation module (50); The preheating module (30) includes a mounting frame (310) and multiple preheating rollers (320) disposed on the mounting frame (310). The multiple preheating rollers (320) are divided into a first preheating roller group (330) for preliminary preheating and a second preheating roller group (340) for secondary preheating along the raw material travel path. The heat dissipation module (50) includes multiple heat dissipation rollers (510) disposed on the winding module (40). The multiple heat dissipation rollers (510) are divided into a first heat dissipation roller group (520) for initial heat dissipation and a second heat dissipation roller group (530) for secondary heat dissipation along the finished film travel path. The thermal energy circulation system includes a heat storage tank (60), a cooling device (70), and a circulation pump (80). The circulation pump (80) drives the heat transfer medium to circulate along a preset path, so that the heat transfer medium that absorbs heat from the heat dissipation module (50) flows through the preheating module (30) to provide heat, and then flows through the cooling device (70) to cool down before flowing back to the heat dissipation module (50).

2. The multi-layer light control film thermal lamination apparatus of claim 1, wherein: The preset heat transfer medium circulation path is as follows: the heat transfer medium flows sequentially through the first heat dissipation roller group (520), the second preheating roller group (340), the first preheating roller group (330), the cooling device (70), the second heat dissipation roller group (530), and finally flows back to the first heat dissipation roller group (520).

3. The multilayer dimming film thermal lamination device according to claim 2, characterized in that: The heat storage tank (60) is located on the connecting pipeline between the first heat dissipation roller group (520) and the second preheating roller group (340), and a heater (610) for auxiliary heating of the heat-conducting medium is provided inside the heat storage tank (60).

4. The multilayer dimming film thermal lamination device according to claim 1, characterized in that: The preheating roller (320) includes an inner shaft (321), a heat-conducting sleeve (322) sleeved outside the inner shaft (321), and a roller sleeve (323) sleeved outside the heat-conducting sleeve (322). The inner wall of the roller sleeve (323) has multiple grooves (324) along the axial direction, and an electric heating wire (325) is provided in the groove (324). A spiral cooling channel (326) is provided between the heat-conducting sleeve (322) and the inner shaft (321). The inner shaft (321) and the heat-conducting sleeve (322) are provided with adapter pipes (327) at both ends for the inflow and outflow of heat-conducting medium.

5. The multilayer dimming film thermal lamination device according to claim 4, characterized in that: The heat dissipation roller (510) adopts the same roller body base structure as the preheating roller (320), but omits the groove (324) and the electric heating wire (325) disposed therein.

6. The multi-layer light control film thermal lamination apparatus of claim 1, wherein: The number of preheating rollers (320) in the first preheating roller group (330) and the second preheating roller group (340) is at least one.

7. The multi-layer light control film thermal lamination apparatus of claim 1, wherein: The number of heat dissipation rollers (510) in the first heat dissipation roller group (520) and the second heat dissipation roller group (530) is at least one.

8. The multi-layer light control film thermal lamination apparatus of claim 1, wherein: The cooling device (70) may be any one or more combinations of a water-cooling device, an air-cooling device, or a semiconductor refrigeration device.

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