Capacitor film manufacturing process and capacitor film

Abstract

The capacitor film manufacturing process comprises the following steps that a base film material is moved through a discharging assembly and passes through the position above an evaporator assembly in the moving process, and the base film material evaporated through the evaporator assembly passes through the lower end of a cooling assembly; the cooling assembly comprises a plurality of cooling roller units arranged in the moving direction of a base material film, the liquid passing assembly comprises a plurality of liquid passing parts corresponding to the cooling rollers, in the cooling process, the cooling liquid is introduced into the cooling rollers through the first liquid passing parts, and the cooling roller units are arranged in the moving direction of the base material film; and the surface temperatures of the plurality of cooling rollers are reduced towards the base film material in a stepped manner. By means of the method, the large temperature difference between the surface and the interior of the film material can be avoided, large stress is prevented from being generated in the film material, therefore, cracks of the base film material caused by excessive stress when the base film material is cooled are avoided, and the product manufacturing quality is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of film coating production and manufacturing, and in particular to a capacitor film manufacturing process and a capacitor film. Background Art

[0002] Usually, metallized film capacitors use materials such as polyester film or polypropylene film as the dielectric, and zinc-aluminum alloy is attached to the film surface by vacuum evaporation to form electrodes. The quality of the metallized film used in capacitors has a great impact on the life of the capacitor.

[0003] The invention patent with publication number CN201410655329.1 discloses a metallized film for capacitors and its manufacturing process. The metallized film includes a base film and a plurality of coating units coated on the base film. The coating units are composed of several layers of metal coatings stacked and covered in sequence. The film material after vapor deposition by the protective oil evaporator bypasses from the bottom of the cooling roller. During vapor deposition, the cooling temperature of the cooling roller is set to -20°C to -25°C.

[0004] However, in the above-mentioned prior art, during the evaporation process of the metallized film, the film material with a higher temperature is directly cooled by a cooling roller with a lower temperature. This makes the temperature difference between the film material and the contacting cooling roller too large, which may cause a large temperature difference between the surface and the inside of the film material, causing stress to be generated inside the material and causing thermal stress to accumulate. When these stresses exceed the strength limit of the material, cracks will be formed, thereby affecting the quality of the film material production. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a capacitor film manufacturing process and a capacitor film. The specific technical solution is as follows:

[0006] One of the purposes of the present invention is to provide a capacitor film manufacturing process. During the coating process, the process is carried out in a container under a vacuum state, including the following steps: the base film material is moved through a discharge assembly, passes over an evaporator assembly during the movement, and forms a plurality of coating units arranged in sequence along its extension direction on one side of the base film material through the evaporator assembly, the base film material after being evaporated by the evaporator assembly passes through the lower end of a cooling assembly, and a liquid passing assembly passes cooling liquid into the cooling assembly to cool the base film material passing below, the cooling assembly includes a plurality of cooling roller units arranged in the direction of movement of the base material film, the liquid passing assembly includes a plurality of liquid passing parts corresponding to the cooling rollers, and during the cooling process, cooling liquid is passed into the plurality of cooling rollers through a liquid passing part, so that the surface temperature of the plurality of cooling rollers decreases in a step-by-step manner toward the base film material direction.

[0007] As an improvement of the above technical solution: after the coating is completed, the base film material is left to stand for a period of time, and then the vacuum state in the container is gradually closed, and the cooling liquid is introduced into multiple cooling rollers through the liquid passing part, so that the surface temperature of the multiple cooling rollers gradually increases, and the gradually increasing temperature is -30-40°C, and the surface temperature of each cooling roller is the same at the same time or the temperature difference does not exceed 1°C, and then the base film material is wound through the winding assembly.

[0008] As an improvement of the above technical solution: the cooling assembly also includes a cooling box, and the bottom of the cooling box is provided with a plurality of connection ports corresponding to the cooling rollers, and each of the cooling rollers is arranged in a connection port.

[0009] As an improvement of the above technical solution: the liquid flow assembly includes a liquid storage tank 1, a liquid flow pipe 1, a liquid inlet pipe, a liquid outlet pipe, a liquid storage tank 2 and a liquid flow pipe 2, both ends of the cooling roller are connected with connecting flow pipes, both ends of the connecting flow pipes are connected with the inner cavity of the cooling roller, one end of the liquid flow pipe 1 is connected to the interior of the liquid storage tank 1, the liquid flow pipe 1 is connected to one end of the liquid inlet pipe, the other end of the liquid inlet pipe is connected to one of the connecting flow pipes through a rotating joint, one end of the liquid outlet pipe is connected to another connecting flow pipe through a rotating joint, valves are installed on the liquid flow pipe 2 and the liquid flow pipe 1, an electric heating tube and a temperature sensor are installed inside the liquid storage tank 2, a pump body 1 is installed on the outside of the liquid storage tank 2, the input end of the pump body 1 is connected to the interior of the liquid storage tank 2 through a pipeline, one end of the liquid flow pipe 2 is connected to the output end of the pump body 1, and the other end of the liquid flow pipe 2 is connected to the liquid inlet pipe.

[0010] As an improvement of the above technical solution: it also includes a rotating part for synchronously rotating multiple pairs of cooling rollers, the rotating part includes a driving motor and a rotating sleeve mounted on the surface of the liquid inlet pipe, one end of the rotating sleeve is connected to the connecting pipe, and the other end of the rotating sleeve is rotatably connected to the cooling box, the surface of the rotating sleeve has a second gear, the output shaft of the driving motor is connected to a first gear meshing with the second gear, the surface of the rotating sleeve is provided with a transmission wheel, and a transmission belt is connected between the multiple transmission wheels.

[0011] As an improvement of the above technical solution: it also includes a cleaning component, which includes a hydraulic cylinder and a connecting bracket, the hydraulic cylinder is installed in a cooling box, the output rod of the hydraulic cylinder is connected to the connecting bracket, the bottom of the connecting bracket has a plurality of V-shaped cleaning frames corresponding to the cooling rollers, the bottom of the V-shaped cleaning frames is provided with a sponge body and a cleaning brush adapted to the cooling roller, and a material collecting box is provided below the cleaning brush.

[0012] As an improvement of the above technical solution: the number of the multiple cooling rollers is set to five groups, and when the surface temperature of the multiple cooling rollers is reduced in a step-by-step manner, the surface temperature of the first cooling roller is 0 to 20°C, the surface temperature of the second cooling roller is 0 to -10°C, the surface temperature of the third cooling roller is -10 to -15°C, the surface temperature of the fourth cooling roller is -15 to -20°C, and the surface temperature of the fifth cooling roller is -25 to -30°C.

[0013] As an improvement of the above technical solution: the unloading assembly includes a flattening roller and a unloading roller, and the flattening roller and the unloading roller are located at the feeding end of the base film material; the winding assembly includes a guide roller and a winding roller, and the guide roller and the winding roller are located at the discharging end of the base film material; when the unloading roller unloads the base film material, the base film material passing through the unloading roller is flattened by the flattening roller to facilitate the flattening and vapor deposition of the base film material by the evaporator assembly; when the winding roller rewinds the base film material, the base film material is guided by the guide roller.

[0014] A second object of the present invention is to provide a capacitor film, including a film made by the above capacitor film manufacturing process.

[0015] Beneficial effects of the present invention:

[0016] 1. During coating, as the base film material moves, it passes through multiple cooling rollers with gradually decreasing surface temperatures, so that the higher temperature on the base film material gradually contacts the cooling rollers from high temperature to low temperature, so that the temperature of the base film material gradually adapts to the temperature on the cooling rollers, and the base film material is gradually cooled to the required temperature. This ensures that the material shrinks evenly throughout the entire volume, reducing the possibility of local stress concentration. Slow cooling provides the material with more time to gradually release the internal accumulated stress, rather than rapidly reducing the surface temperature of the base film material, so that the surface of the base film material will cool rapidly while the interior remains at a high temperature, thereby avoiding a large temperature difference between the surface and the interior of the film material, avoiding large internal stress, and thus avoiding excessive stress when the base film material is cooled, which may cause cracks in the base film material.

[0017] 2. In the process of cooling the base film material through multiple cooling rollers, the cooling roller can be continuously rotated by the rotating part to pass through the cleaning brush and the sponge. On the one hand, the vapor liquid adhered to the surface of the cooling roller produced by the evaporation of the evaporator component can be cleaned by the cleaning brush and adsorbed by the sponge to avoid the vapor adhered to the cooling roller being adsorbed by one side of the base film material during the cooling process, so as to avoid the generation of impurities on the surface of the base film material, thereby avoiding affecting the quality of the base film material. On the other hand, when the hot vapor adheres to the cooling roller, the temperature of the surface of the cooling roller will increase, affecting the cooling effect of the cooling roller on the base film material. The hot vapor adhered to the cooling roller is removed by the sponge and the cleaning brush to avoid the external temperature from affecting the cooling roller, thereby maintaining the cooling effect of the cooling roller on the base film material and improving the production quality of the base film material.

[0018] 3. After the coating contact, let the base film material stand for a while, and then inject coolant at a temperature of -30 degrees Celsius into the second liquid storage tank. By gradually increasing the temperature of the cooling roller surface, the temperature of the base film material can gradually adapt to the temperature of the cooling roller, avoiding the base film material from rupture due to excessive temperature difference between the base film material and the cooling roller and generating stress, so that the temperature of the base film material and the cooling roller is close to room temperature, and then break the vacuum and reel the base film material through the winding assembly, so as to avoid the cooling roller from generating condensate due to temperature difference and also avoid the base film material from stress rupture due to temperature difference. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a schematic diagram of the structure of the cooling assembly in the present invention;

[0021] Figure 3 It is a schematic diagram of the connection structure between the cooling component and the liquid passing component in the present invention;

[0022] Figure 4 It is a schematic diagram of the structure of the cooling roller in the present invention;

[0023] Figure 5 It is a schematic diagram of the structure of the liquid storage tank 2 in the present invention.

[0024] Reference numerals: 1, container; 100, base film material; 2, evaporator assembly; 21, shielding oil evaporator; 22, silver evaporator; 23, aluminum evaporator; 24, zinc evaporator; 25, protective oil evaporator; 3, cooling assembly; 30, cooling roller; 300, liquid inlet pipe; 301, liquid outlet pipe; 31, cooling box; 310, connection port; 32, hydraulic cylinder; 33, connecting bracket; 34, V-shaped cleaning rack; 341, sponge; 342 , cleaning brush; 35, material collection box; 36, rotating sleeve; 37, driving motor; 371, first gear; 372, second gear; 38, transmission wheel; 381, transmission belt; 39, connecting pipe; 41, flattening roller; 42, unwinding roller; 51, guide roller; 52, winding roller; 6, liquid storage tank one; 61, liquid pipe one; 7, liquid storage tank two; 71, liquid pipe two; 72, pump body one; 74, electric heating tube; 75, temperature sensor. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0026] Example

[0027] Please refer to Figure 1-Figure 5 , capacitor film manufacturing process, during coating, it is carried out in a container 1 under a vacuum state, including the following steps: the base film material moves through the discharge assembly, passes above the evaporator assembly 2 during the movement, and forms a plurality of coating units arranged in sequence along the extension direction of the base film material on one side of the base film material through the evaporator assembly 2, the base film material after being evaporated by the evaporator assembly passes through the lower end of the cooling assembly, the liquid passing assembly passes the coolant into the cooling assembly to cool the base film material passing below, the cooling assembly includes a plurality of cooling roller units arranged in the moving direction of the base material film, the liquid passing assembly includes a plurality of liquid passing parts corresponding to the cooling rollers, during the cooling process, the coolant is passed into the plurality of cooling rollers 30 through the liquid passing part, so that the surface temperature of the plurality of cooling rollers 30 decreases stepwise toward the base film material direction;

[0028] Specifically, the evaporator assembly 2 is of prior art, and may be a shielding oil evaporator 21, a silver evaporator 22, an aluminum evaporator 23, a zinc evaporator 24 and a protective oil evaporator 25 arranged in sequence from the feeding direction of the base film material 100, and its coating unit contains 1-4% of silver element, 4-8% of aluminum element, and 90-95% of zinc element in terms of mass percentage; during the coating process, the film material moving speed is 15-25m / s, the heating temperature of the shielding oil evaporator is 230-270 degrees Celsius, and the steam flow velocity in the vertical direction from the steam source to the film material is approximately 0.3-0.6m / s. The heating temperature of the silver material in the silver evaporator is 950-1050°C, and the steam flow velocity in the vertical direction from the evaporation source to the film material is about 0.3-0.6m / s; the heating current of the evaporation boat of the aluminum evaporator is 50-100A, the aluminum feeding speed is 400-800mm / min, the steam flow velocity in the vertical direction from the evaporation source to the film material is 0.4-0.6m / s, and the diameter of the aluminum wire fed is 2-3mm; the heating temperature of the zinc source in the zinc evaporator is 600-700°C, and the steam flow velocity in the vertical direction from the evaporation source to the film material is about 6.5m / s; the heating temperature of the protective oil evaporator is 230 to 270 degrees Celsius, and the steam flow velocity in the vertical direction from the steam source to the film material is 0.3-0.6m / s.

[0029] The above-mentioned evaporation source materials, such as aluminum wire, zinc strip, etc., can also be provided with a bias system (electrostatic adsorption) for adsorbing the cooling roller and the film material. The bias value applied between the cooling roller and the film material is 100-110V / μm, where μm is the thickness of the base film, that is, as the base film thickens, the bias value increases. After the coating is completed, the metallized film (MPP) material obtained after the coating is completed can be made into a low-voltage power capacitor through slitting, winding, gold spraying, welding, dipping, filling and other processes.

[0030] Specifically, during coating, as the base film material 100 moves, it passes through a plurality of cooling rollers 30 whose surface temperatures gradually decrease, so that the higher temperature on the base film material 100 gradually contacts the cooling rollers 30 whose surface temperatures change from high to low, so that the temperature of the base film material 100 gradually adapts to the temperature on the cooling rollers 30, and the base film material 100 is gradually cooled to the required temperature. This ensures that the material shrinks evenly throughout the entire volume, reduces the possibility of local stress concentration, and the slow cooling provides the material with more time to gradually release the internal accumulated stress, rather than rapidly reducing the surface temperature of the base film material 100, so that the surface of the base film material 100 cools rapidly while the interior remains at a relatively high temperature, thereby avoiding a large temperature difference between the surface and the interior of the film material, avoiding large stress inside, and thus avoiding excessive stress when the base film material 100 is cooled, which may cause cracks in the base film material 100.

[0031] In an optional embodiment: after the coating is completed, the base film material 100 is left to stand for a period of time, and then the vacuum state in the container is gradually closed, and the cooling liquid is introduced into the multiple cooling rollers 30 through the liquid passage part, so that the surface temperature of the multiple cooling rollers 30 gradually increases, and the gradually increasing temperature is -30-40°C, and the surface temperature of each cooling roller 30 is the same at the same time or the temperature difference does not exceed 1°C, and then the base film material is wound through the winding assembly.

[0032] In an optional embodiment: the cooling assembly further includes a cooling box 31 , a bottom of the cooling box 31 is provided with a plurality of connection ports 310 corresponding to the cooling rollers 30 , and each cooling roller 30 is disposed in a connection port 310 .

[0033] In an optional embodiment: the liquid passing component includes a liquid storage tank 16, a liquid passing pipe 161, a liquid inlet pipe 300, a liquid outlet pipe 301, a liquid storage tank 27 and a liquid passing pipe 271, both ends of the cooling roller 30 are connected with connecting pipes 39, both ends of the connecting pipes 39 are connected to the inner cavity of the cooling roller 30, one end of the liquid passing pipe 161 is connected to the inside of the liquid storage tank 16, the liquid passing pipe 161 is connected to one end of the liquid inlet pipe 300, the other end of the liquid inlet pipe 300 is connected to one of the connecting pipes 39 through a rotating joint, and one end of the liquid outlet pipe 301 is connected to another connecting pipe 39 through a rotating joint. 9 are connected, and valves are installed on the liquid pipe 2 71 and the liquid pipe 1 61, through which the coolant in the liquid storage tank 1 6 and the liquid storage tank 2 7 can enter the liquid inlet pipe 300, and the electric heating pipe 74 and the temperature sensor 75 are installed inside the liquid storage tank 2 7, and the pump body 1 72 is installed outside the liquid storage tank 2 7, and the input end of the pump body 1 72 is connected to the inside of the liquid storage tank 2 7 through a pipeline, one end of the liquid pipe 2 71 is connected to the output end of the pump body 1 72, and the other end of the liquid pipe 2 71 is connected to the liquid inlet pipe 300, and through the cooperation of the electric heating pipe 74 and the temperature sensor 75, the temperature inside the liquid storage tank 2 7 can be gradually increased;

[0034] Specifically, at the beginning, the temperature of the coolant injected into the liquid storage tank 2 7 is -30 degrees Celsius. By gradually increasing the temperature of the surface of the cooling roller 30, the temperature of the base film material 100 can gradually adapt to the temperature of the cooling roller 30, thereby preventing the base film material 100 from rupturing due to excessive temperature difference between the base film material 100 and the cooling roller 30 and generating stress, so that the temperatures of the base film material 100 and the cooling roller 30 are close to room temperature, and then the vacuum is broken and the base film material 100 is wound up through the winding assembly, thereby preventing the cooling roller 30 from generating condensate due to the temperature difference and also preventing the base film material 100 from ruptured due to stress due to the temperature difference.

[0035] In an optional embodiment: it also includes a rotating part for synchronously rotating multiple pairs of cooling rollers 30, the rotating part includes a driving motor 37 and a rotating sleeve 36 sleeved on the surface of the liquid inlet pipe 300, one end of the rotating sleeve 36 is connected to the connecting pipe 39, and the other end of the rotating sleeve 36 is rotatably connected to the cooling box 31, the surface of the rotating sleeve 36 has a second gear 372, the output shaft of the driving motor 37 is connected to the first gear 371 meshing with the second gear 372, the surface of the rotating sleeve 36 is provided with a transmission wheel 38, and the multiple transmission wheels 38 are transmission-connected with a transmission belt 381, so that the cooling roller 30 can be driven to rotate by running the driving motor 37, so that during cooling, the cooling roller 30 can continuously rotate to evenly cool the film material, and the cooling effect is good.

[0036] In an optional embodiment: since there is a situation where steam is emitted in the container 1 during the evaporation process through the evaporator assembly, a cleaning assembly is also included, the cleaning assembly includes a hydraulic cylinder 32 and a connecting bracket 33, the hydraulic cylinder 32 is installed in the cooling box 31, the output rod of the hydraulic cylinder 32 is connected to the connecting bracket 33, the bottom of the connecting bracket 33 has a plurality of V-shaped cleaning racks 34 corresponding to the cooling roller 30, the bottom of the V-shaped cleaning rack 34 is provided with a sponge 341 and a cleaning brush 342 adapted to the cooling roller 30, and a material receiving box 35 is provided below the cleaning brush 342;

[0037] Specifically, in the process of cooling the base film material 100 after passing through multiple cooling rollers 30, the cooling roller 30 can be continuously rotated by the rotating part to pass through the cleaning brush 342 and the sponge 341. On the one hand, the vapor liquid adhered to the surface of the cooling roller 30 produced by the evaporation of the evaporator component can be brushed by the cleaning brush 342 and adsorbed by the sponge 341, so as to avoid the vapor adhered to the cooling roller 30 being adsorbed by one side of the base film material 100 during the cooling process, so as to avoid the generation of impurities on the surface of the base film material 100, thereby avoiding affecting the quality of the base film material 100. On the other hand, when the hot vapor adheres to the cooling roller 30, the temperature of the surface of the cooling roller 30 will increase, affecting the cooling effect of the cooling roller 30 on the base film material 100. The hot vapor adhered to the cooling roller 30 is removed by the sponge 341 and the cleaning brush 342, so as to avoid the external temperature from affecting the cooling roller 30, thereby maintaining the cooling effect of the cooling roller 30 on the base film material 100 and improving the production quality of the base film material 100.

[0038] In an optional embodiment: the number of the plurality of cooling rollers 30 is set to five groups, when the surface temperature of the plurality of cooling rollers 30 is decreased in a step-by-step manner, the surface temperature of the first cooling roller 30 is 0 to 20°C, the surface temperature of the second cooling roller 30 is 0 to -10°C, the surface temperature of the third cooling roller 30 is -10 to -15°C, the surface temperature of the fourth cooling roller 30 is -15 to -20°C, and the surface temperature of the fifth cooling roller 30 is -25 to -30°C.

[0039] In an optional embodiment: the unloading component includes a flattening roller 41 and a unloading roller 42, the flattening roller 41 and the unloading roller 42 are located at the feeding end of the base film material 100, and the winding component includes a guide roller 51 and a winding roller 52, the guide roller 51 and the winding roller 52 are located at the discharging end of the base film material 100, when the unloading roller 42 unloads the base film material 100, the flattening roller 41 is used to flatten the base film material 100 passing through the unloading roller, so as to facilitate the flattening and vapor deposition of the base film material 100 through the evaporator assembly 2, and when the winding roller 52 rewinds the base film material 100, the guide roller 51 is used to guide the base film material 100.

[0040] A capacitor film, including a film made by the above capacitor film manufacturing process, specifically, the film includes a polypropylene film base film and a plurality of coating units coated on one side of the base film, the coating units are composed of several layers of metal coatings such as silver, aluminum, zinc, etc. stacked and covered in sequence, and the coating units are arranged in sequence on the base film along the horizontal direction.

[0041] 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 and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A capacitor film manufacturing process, during film coating, is carried out in a container (1) under a vacuum state, comprising the following steps: The base film material moves through the discharge assembly, passes above the evaporator assembly (2) during the movement, and forms a plurality of coating units arranged in sequence along the extension direction on one side of the base film material through the evaporator assembly (2). The base film material after being evaporated by the evaporator assembly passes through the lower end of the cooling assembly. It is characterized in that the liquid passing assembly passes the coolant into the cooling assembly (3) to cool the base film material passing below. The cooling assembly (3) includes a plurality of cooling roller units arranged in the moving direction of the base material film. The liquid passing assembly includes a plurality of liquid passing parts corresponding to the cooling rollers. During the cooling process, the coolant is passed into the plurality of cooling rollers (30) through the liquid passing parts, so that the surface temperature of the plurality of cooling rollers (30) decreases in a step-by-step manner toward the base film material direction.

2. The capacitor film manufacturing process according to claim 1, characterized in that: After the coating is completed, the base film material (100) is left to stand for a period of time, and then the vacuum state in the container is gradually closed, and cooling liquid is introduced into the multiple cooling rollers (30) through the liquid passage part, so that the surface temperature of the multiple cooling rollers (30) gradually increases, and the gradually increasing temperature is -30-40°C, and the surface temperature of each cooling roller (30) is the same at the same time or the temperature difference does not exceed 1°C, and then the base film material is wound through the winding component.

3. The capacitor film manufacturing process according to claim 2, characterized in that: The cooling assembly further comprises a cooling box (31), the bottom of which is provided with a plurality of connection ports (310) corresponding to the cooling rollers (30), and each of the cooling rollers (30) is arranged in a connection port (310).

4. The capacitor film manufacturing process according to claim 3, characterized in that: The liquid passage assembly comprises a liquid storage tank (6), a liquid passage pipe (61), a liquid inlet pipe (300), a liquid outlet pipe (301), a liquid storage tank (7) and a liquid passage pipe (71). Both ends of the cooling roller (30) are connected to connecting passages (39). Both ends of the connecting passages (39) are connected to the inner cavity of the cooling roller (30). One end of the liquid passage pipe (61) is connected to the interior of the liquid storage tank (6). The other end of the liquid passage pipe (61) is connected to one end of the liquid inlet pipe (300). The other end of the liquid inlet pipe (300) is connected to the passage (39) through the connecting passage. The rotary joint is connected to one of the connecting pipes (39), one end of the liquid outlet pipe (301) is connected to the other connecting pipe (39) through the rotary joint, valves are installed on the second liquid pipe (71) and the first liquid pipe (61), an electric heating pipe (74) and a temperature sensor (75) are installed inside the second liquid storage tank (7), a pump body (72) is installed outside the second liquid storage tank (7), an input end of the pump body (72) is connected to the inside of the second liquid storage tank (7) through a pipeline, and an output end of the pump body (72) is connected to the second liquid pipe (71).

5. The capacitor film manufacturing process according to claim 4, characterized in that: It also includes a rotating part for synchronously rotating multiple pairs of cooling rollers (30), the rotating part includes a driving motor (37) and a rotating sleeve (36) sleeved on the surface of the liquid inlet pipe (300), one end of the rotating sleeve (36) is connected to the connecting pipe (39), and the other end of the rotating sleeve (36) is rotatably connected to the cooling box (31), the surface of the rotating sleeve (36) has a second gear (372), the output shaft of the driving motor (37) is connected to a first gear (371) meshing with the second gear (372), the surface of the rotating sleeve (36) is provided with a transmission wheel (38), and a transmission belt (381) is connected between the multiple transmission wheels (38).

6. The capacitor film manufacturing process according to claim 4, characterized in that: The invention also comprises a cleaning component, which comprises a hydraulic cylinder (32) and a connecting bracket (33). The hydraulic cylinder (32) is installed in a cooling box (31). The output rod of the hydraulic cylinder (32) is connected to the connecting bracket (33). The bottom of the connecting bracket (33) has a plurality of V-shaped cleaning frames (34) corresponding to the cooling roller (30). The bottom of the V-shaped cleaning frame (34) is provided with a sponge body (341) and a cleaning brush (342) adapted to the cooling roller (30). A material receiving box (35) is provided below the cleaning brush (342).

7. The capacitor film manufacturing process according to claim 6, characterized in that: The number of the plurality of cooling rollers (30) is set to five groups. When the surface temperature of the plurality of cooling rollers (30) is decreased stepwise, the surface temperature of the first cooling roller (30) is 0-20°C, the surface temperature of the second cooling roller (30) is 0 to -10°C, the surface temperature of the third cooling roller (30) is -10 to -15°C, the surface temperature of the fourth cooling roller (30) is -15 to -20°C, and the surface temperature of the fifth cooling roller (30) is -25 to -30°C.

8. The capacitor film manufacturing process according to claim 2, characterized in that: The unloading assembly comprises a flattening roller (41) and a unloading roller (42), wherein the flattening roller (41) and the unloading roller (42) are located at the feeding end of the base film material (100), and the winding assembly comprises a guide roller (51) and a winding roller (52), wherein the guide roller (51) and the winding roller (52) are located at the discharging end of the base film material (100). When the unloading roller (42) unloads the base film material (100), the flattening roller (41) is used to flatten the base film material (100) passing through the unloading roller, so as to facilitate the flattening and vapor deposition of the base film material (100) by the evaporator assembly (2); when the winding roller (52) rewinds the base film material (100), the guide roller (51) is used to guide the base film material (100).

9. Capacitor film, characterized in that: A film made by the capacitor film manufacturing process according to any one of claims 1 to 8.

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