A method and equipment for manufacturing a metallized film

Abstract

The present application discloses a method and apparatus for producing a metallized film. The apparatus comprises an unwinding device, a pre-treatment device, a shielding oil device, a cold drum, a protective oil device, a post-treatment device, and a winding device, arranged at intervals along the direction of conveyance of the base film. The apparatus also comprises at least one evaporation device for evaporating metal onto the base film on the surface of the cold drum, wherein the at least one evaporation device comprises an evaporation boat, a baffle, and a wire feed pipe, the evaporation boat being positioned below the cold drum, the wire feed pipe being positioned above the evaporation boat, and the wire feed pipe being arranged curved toward the evaporation boat. The winding device comprises a winding and flattening roller, at least one end of which is provided with a thickening layer, the thickening layer being arranged around the circumference of the winding and flattening roller. The thickening layer is used to increase the diameter of the end of the winding and flattening roller and to increase the friction of the end surface of the winding and flattening roller. The present application can be widely applied in the field of evaporative film coating technology.

Description

Technical Field

[0001] The present application relates to the technical field of evaporation coating, and in particular to a method and equipment for manufacturing a metallized film. Background Art

[0002] The metallized film's metal coating is divided into multiple small electrode grids by insulating gaps. These grids are connected by narrow metal coatings, which act as fuses. When a localized breakdown occurs within the capacitor, a large instantaneous current blows the fuses surrounding the electrode grid at the breakdown point, isolating the current and preventing it from flowing further through the breakdown point. The energy generated during the breakdown process is minimal, preventing serious damage or even explosion to the capacitor, resulting in a high level of safety protection.

[0003] However, existing metallized films often suffer from film breakage, film surface wrinkles, and uneven metal coating during the evaporation coating process, which not only affects the production of the metallized film, but also affects the performance of the metallized film. Summary of the Invention

[0004] In order to solve at least one of the above technical problems, the present application provides a method and equipment for manufacturing a metallized film, and the technical solution adopted is as follows.

[0005] The manufacturing equipment of the metallized film provided in the present application includes a unwinding device, a pre-treatment device, a shielding oil device, a cold drum, a protective oil device, a post-treatment device and a winding device arranged at intervals along the conveying direction of the base film; the manufacturing equipment also includes at least one evaporation device for evaporating metal onto the base film on the surface of the cold drum, wherein at least one of the evaporation devices includes an evaporation boat, a baffle and a metal wire conveying pipe, the evaporation boat is located on the lower side of the cold drum, the metal wire conveying pipe is located on the upper side of the evaporation boat, and the metal wire conveying pipe is bent toward the evaporation boat; the winding device includes a winding and flattening roller, at least one end of the winding and flattening roller is provided with a thickening layer, the thickening layer is arranged on the surface of the winding and flattening roller along the circumference of the winding and flattening roller, and the thickening layer is used to increase the diameter of the end of the winding and flattening roller and increase the friction force of the surface of the end of the winding and flattening roller.

[0006] In certain embodiments of the present application, the wire feeding tube is bent along a parabolic trajectory.

[0007] In certain embodiments of the present application, the winding and flattening roller includes a mounting shaft and a winding roller, the winding roller is rotatably mounted on the outer side of the mounting shaft, the mounting shaft has a curvature in the axial direction, and the thickening layer is arranged on the outer side of the winding roller.

[0008] In certain embodiments of the present application, the radius R of the arc on which the central axis of the installation shaft is located is [28500 mm, 30000 mm], and the arc height H of the installation shaft is [3 mm, 5 mm].

[0009] In certain embodiments of the present application, the thickening layer is configured as masking paper.

[0010] In certain embodiments of the present application, the pre-treatment device and the post-treatment device both include a cathode and an anode, and both the pre-treatment device and the post-treatment device treat the film surface with plasma.

[0011] In certain embodiments of the present application, two evaporation devices are provided, wherein one of the evaporation devices is used to evaporate aluminum, and the other evaporation device is used to evaporate zinc.

[0012] In certain embodiments of the present application, the shielding oil device and the protection oil device both include an oil roller, and a heating structure is provided in the oil roller.

[0013] In certain embodiments of the present application, a circulation pipeline for introducing a refrigerant is provided inside the cold drum.

[0014] The method for manufacturing the metallized film provided in the present application is based on the manufacturing equipment as described above. The manufacturing equipment is vacuumed to a set value, the winding device pulls the base film, the pre-treatment device performs surface polarization treatment on the base film, the shielding oil device evaporates and condenses the shielding oil to the surface of the base film to form a shielding belt, the metal wire is transported to the evaporation boat along a curved trajectory and evaporates and adheres to the surface of the base film, the protective oil device evaporates and condenses the protective oil to the surface of the film, and the post-treatment device treats the surface of the film.

[0015] In certain embodiments of the present application, the baffle of the evaporation device is opened when the cold drum rotation speed reaches 8 m / s; when the evaporation device evaporates metallic aluminum, the conveying speed of the aluminum wire does not exceed 400 mm / min.

[0016] The present application has at least the following beneficial effects: the base film passes through a pre-treatment device, a shielding oil device, a cold drum, a protective oil device, a post-treatment device and a winding device in sequence from an unwinding device, and on the lower side of the cold drum, an evaporation boat evaporates metal and condenses it onto the surface of the base film to form a metal coating;

[0017] In the evaporation device, a curved wire feeding tube is used to feed the wire to the evaporation boat, so that the wire is fed to the high-temperature area of the evaporation boat, avoiding the wire being mistakenly fed to the low-temperature area of the evaporation boat when feeding along a straight trajectory, thereby improving the evaporation uniformity of the wire and thus improving the uniformity of the metal coating;

[0018] The winding and flattening roller in the winding mechanism has a thickening layer at its end. The edge of the wound film is placed against the thickening layer. This layer modifies the diameter of the winding and flattening roller, thereby matching the film's linear speed on the roller surface. Furthermore, the thickening layer increases the film's friction on the winding and flattening roller. This combination of matching linear speeds and increasing friction prevents film wrinkles.

[0019] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present application is further illustrated below with reference to the accompanying drawings and embodiments. It should be noted that the embodiments shown in the following drawings are exemplary and are only used to explain the present application, and should not be construed as limiting the present application.

[0021] Figure 1 This is a schematic diagram of the layout of the various structures of the manufacturing equipment in this application.

[0022] Figure 2 This is a structural diagram of the winding and flattening roller in this application.

[0023] Figure 3 This is a schematic diagram of the structure of the aluminum evaporation device in this application.

[0024] Figure numerals: 110, unwinding device; 120, winding device; 121, winding and flattening roller; 122, thickening layer; 123, mounting shaft; 124, winding roller; 210, pre-treatment device; 220, post-treatment device; 310, cold drum; 320, aluminum evaporation device; 321, aluminum wire conveying pipe; 322, aluminum evaporation boat; 330, zinc evaporation device. DETAILED DESCRIPTION

[0025] The following combination Figures 1 to 3 The embodiments of the present application are described in detail, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0026] In the description of this application, it should be understood that if the terms "center", "middle", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0027] In the description of this application, "several" means more than one, "plurality" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0028] In the description of this application, unless otherwise specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed, detachable, or integral connections; they can refer to mechanical or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0029] In the description of this application, if the reference terms "one embodiment", "some embodiments", "one embodiment", "some examples", "some embodiments", "illustrative embodiment", "example", "specific example", "some examples", etc. appear, it means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples.

[0030] The present application relates to a manufacturing device for a metallized film, which includes an unwinding device 110, a pre-treatment device 210, a shielding oil device, a cold drum 310, a protective oil device, a post-treatment device 220, and a winding device 120, which are arranged at intervals along the conveying direction of the base film. Specifically, the base film is wound in the unwinding device 110, the base film is released from the unwinding device 110, the pre-treatment device 210 performs surface treatment on the base film, the shielding oil device places shielding oil at a set position on the surface of the base film, the base film is plated with a metal layer by evaporation at the cold drum 310, the protective oil device places protective oil on the surface of the film, the post-treatment device 220 performs surface treatment on the film, and the winding device 120 winds the film.

[0031] It is understandable that the manufacturing equipment further includes at least one evaporation device, which is disposed near the side of the cold drum 310 and is used to evaporate metal onto the base film on the surface of the cold drum 310 .

[0032] Specifically, at least one of the evaporation devices includes an evaporation boat and a baffle. The evaporation boat is located below the cold drum 310, and the baffle is disposed between the evaporation boat and the cold drum 310. The evaporation boat is made of boron nitride and can reach a temperature of 1000°C to 1300°C. The high temperature of the evaporation boat melts the metal wire to achieve metal evaporation coating.

[0033] Furthermore, the evaporation device includes a wire conveying pipe, which is located on the upper side of the evaporation boat. The wire extends from the wire conveying pipe and is conveyed to the evaporation boat.

[0034] It's important to note that the wire feed tube is curved toward the evaporation boat. It arches upward and then bends downward along the feed path, allowing the wire to be transported along a curved trajectory to the evaporation boat, preventing it from curling and deforming during heating. This curved feed tube ensures that the wire lands in the high-temperature area in the center of the evaporation boat, ensuring a balance between the evaporation rate and the deposition rate. This prevents uneven thickness of the metal coating caused by variations in evaporation rate, thereby ensuring uniform coating quality.

[0035] In the prior art, a metal wire is fed along a straight path into the evaporation boat. Due to the influence of heat radiation on the wire, it can become soft and warped, and its landing point in the evaporation boat can easily shift and become uncontrollable. This can cause the wire to land in low-temperature areas of the boat, affecting the evaporation and deposition rates, and consequently, the uniformity of the metal coating.

[0036] In some examples, the metal wire conveying tube is arranged along a parabolic trajectory. The parabolic trajectory is reasonable and more conducive to conveying the metal wire to the central area of the evaporation boat.

[0037] It is understood that the winding device 120 includes a winding and flattening roller 121, and the film is wound around the side of the winding and flattening roller 121. Under the traction of the winding and flattening roller 121, the base film is released from the unwinding device 110 and transported forward according to the process until it is wound around the winding and flattening roller 121.

[0038] Furthermore, a thickening layer 122 is provided on at least one end of the winding and flattening roller 121. The thickening layer 122 is arranged on the surface of the winding and flattening roller 121 along the circumference of the winding and flattening roller 121. The edge of the film is located in the area where the thickening layer 122 is located. The thickening layer 122 is used to increase the diameter of the end of the winding and flattening roller 121 and increase the friction force on the surface of the end of the winding and flattening roller 121, so that the film roll has good friction force and matching linear speed on the roller surface, ensuring that the edge of the film is flattened.

[0039] In some examples, the thickened layer 122 is configured as a textured paper.

[0040] In some examples, the winding and flattening roller 121 includes a mounting shaft 123 and a winding roller 124. The winding roller 124 is rotatably mounted on the outer side of the mounting shaft 123, and the thickening layer is disposed on the outer side of the winding roller 124. It is understood that the winding roller 124 rotates on the mounting shaft 123 to wind up the film.

[0041] The winding device drives the winding roller 124 to rotate in a belt transmission manner, and a pulley is provided at one end of the winding roller 124.

[0042] A plurality of rolling bearings are sleeved on the outer side surface of the mounting shaft 123 , and the inner side wall of the winding roller 124 is connected to the outer ring of the rolling bearings.

[0043] Furthermore, the mounting shaft 123 has an axial curvature, forming an arc along its length. The mounting shaft 123 is fixedly mounted to the frame of the winding device and can be rotated and adjusted. By rotating and then securing the rotating mounting shaft 123, the user can adjust the flattening and tensioning of the film by the sidewall of the winding roller 124.

[0044] In some examples, the radius R of the arc of the central axis of the mounting shaft 123 is [28500 mm, 30000 mm], and the arc height H of the mounting shaft 123 is [3 mm, 5 mm]. It should be noted that the arc height H refers to the height difference between the center point of the end of the mounting shaft 123 and the midpoint of the central axis of the mounting shaft 123.

[0045] In some embodiments, the pretreatment device 210 includes a cathode and an anode, and treats the membrane surface with plasma. The anode is connected to a high-voltage DC power supply with a power of 3 kW to 5 kW. An inert gas is passed between the cathode and anode. Preferably, the inert gas is argon.

[0046] It is understandable that, during the evaporation coating process, the pre-treatment device 210 forms plasma, and the plasma treats the surface of the base film to achieve the effect of polarization treatment of the base film surface.

[0047] In some embodiments, the shielding oil device includes an oil roller equipped with a heating structure. Specifically, the heating structure heats the shielding oil to a temperature of 100°C to 160°C. The shielding oil evaporates and condenses onto a predetermined area on the surface of the base film, forming a shielding band on the base film surface.

[0048] Furthermore, the shielding oil device includes a shielding oil pipe, which is used to transport shielding oil to the oil roller. In some examples, the shielding oil is fluorine-based oil.

[0049] In some embodiments, two evaporation devices are provided. Specifically, one evaporation device is used to evaporate aluminum, serving as the aluminum evaporation device 320, and the other evaporation device is used to evaporate zinc, serving as the zinc evaporation device 330. The aluminum coating is evaporated first, followed by the zinc coating, thereby forming a zinc-aluminum metal layer on the surface of the base film.

[0050] Specifically, the evaporation device for evaporating aluminum includes an aluminum evaporation boat 322, a baffle, and an aluminum wire conveying pipe 321. The evaporation device for evaporating zinc includes a zinc evaporation boat, a baffle, a zinc tank, and a nozzle, and zinc is placed in the zinc tank.

[0051] In some embodiments, the cold drum 310 is cylindrical and is a metal roller. One side of the base film is attached to the side of the cold drum 310, and the other side of the base film is used for metal coating.

[0052] It should be noted that the interior of the cold drum 310 is equipped with a refrigerant circulation line. The refrigerant maintains the surface temperature of the cold drum 310 at 0 to -20°C. The metal vapor is cooled and adheres to the surface of the base film, forming a metal electrode. Because the shielding band formed by the shielding oil on the base film has low surface tension, metal molecules cannot adhere, resulting in an insulating gap without a metal electrode.

[0053] In some embodiments, the manufacturing equipment includes a vacuum chamber, and the cold drum 310 and the evaporation device are disposed in the vacuum chamber, and the vacuum chamber provides a vacuum environment for metal evaporation coating.

[0054] If the vacuum is not in a vacuum state or the vacuum degree does not meet the standard, the aluminum evaporation process will react with the oxygen in the air to form non-conductive Al2O3, and the metal coating required for the metallized film cannot be obtained.

[0055] In some embodiments, the protective oil device includes an oil roller equipped with a heating structure. Specifically, the heating structure heats the protective oil to a temperature of 100°C to 160°C. The protective oil evaporates and condenses onto the surface of the film, forming a protective oil film on the surface of the metal coating.

[0056] Furthermore, the protective oil is composed of silicone oil.

[0057] In some embodiments, post-treatment device 220 includes a cathode and an anode, and treats the membrane surface with plasma. The anode is connected to a high-voltage DC power supply with a power of 5 kW to 15 kW. An inert gas is passed between the cathode and anode. Preferably, the inert gas is argon.

[0058] It is understood that during the evaporation process, the post-processing device 220 generates plasma, which processes the surface of the film. The protective oil film on the surface of the metal layer can undergo a certain degree of cross-linking under the action of the plasma, thereby forming a more stable protective oil film.

[0059] The present application relates to a method for manufacturing a metallized film, and the manufacturing method is implemented based on the manufacturing equipment as described above.

[0060] Specifically, the manufacturing equipment is vacuumed to a set value, the winding device 120 pulls the base film, the pre-treatment device 210 performs surface polarization treatment on the base film, the shielding oil device evaporates and condenses the shielding oil to the surface of the base film to form a shielding belt, the metal wire is transported to the evaporation boat along a curved trajectory and evaporates and adheres to the surface of the base film, the protective oil device evaporates and condenses the protective oil to the surface of the film, and the post-treatment device 220 treats the surface of the film.

[0061] It should be noted that the base film is a 2.4 μm polypropylene film or polyester film.

[0062] Before the manufacturing equipment is closed, the tension of the unwinding device 110 and the rewinding device 120 is set to a set value to tension and rewind the film. Specifically, the tension of the unwinding device 110 is set to 29N, and the tension of the rewinding device 120 is set to 21N.

[0063] When the manufacturing equipment is vacuumed, the shielding oil pipe of the shielding oil device is returned to the waiting position to avoid scalding the film due to the high temperature of the oil roller of the shielding oil device. The vacuum degree of the inner cavity of the manufacturing equipment is set to no more than 10 -2 Pa, under this vacuum condition, the metal can be evenly and densely plated on the surface of the base film.

[0064] Specifically, the vacuum degree does not exceed 10 -2Under Pa, the evaporation temperature of aluminum is about 1300°C, while under standard atmospheric pressure, the evaporation temperature of aluminum is 2700°C. On the other hand, it is necessary to ensure that aluminum evaporates to form the metal layer required for the metallization film.

[0065] It should be noted that the damper of the evaporation device is opened when the speed of the cold drum 310 reaches 8m / s. If the damper is opened too quickly, it will cause the film to break when the plating starts, because the slow speed and high temperature of the evaporation boat at the beginning of the plating process can easily damage the base film.

[0066] When evaporating aluminum metal, the aluminum wire conveyor speed does not exceed 400 mm / min to prevent thermal radiation from the evaporating aluminum from damaging the base film. Furthermore, by controlling the evaporation boat temperature during the deposition process, the overall boat power is kept at 90%. This effectively reduces the amount of thermal radiation from the evaporation boat to the base film. Excessive thermal radiation from the evaporation boat to the base film can easily cause film breakage during the deposition process.

[0067] The embodiments of the present application have been described in detail above with reference to the accompanying drawings. However, the present application is not limited to the above embodiments. Various modifications can be made within the scope of knowledge possessed by ordinary technicians in the technical field without departing from the purpose of the present application. In addition, the embodiments of the present application and the features of the embodiments can be combined with each other unless there is a conflict.

Claims

1. A metallized film manufacturing device, characterized in that: It includes an unwinding device, a pre-treatment device, a shielding oil device, a cooling drum, a protective oil device, a post-treatment device and a winding device which are arranged at intervals along the conveying direction of the base film; The manufacturing equipment further includes at least one evaporation device for evaporating metal onto the base film on the surface of the cold drum, wherein at least one of the evaporation devices includes an evaporation boat, a baffle, and a metal wire feeding pipe, wherein the evaporation boat is located on the lower side of the cold drum, and the metal wire feeding pipe is located on the upper side of the evaporation boat, and the metal wire feeding pipe is arranged to be bent toward the evaporation boat; The winding device includes a winding and flattening roller, at least one end of which is provided with a thickening layer so that the edge of the film is located in the area where the thickening layer is located, and the thickening layer is arranged on the surface of the winding and flattening roller along the circumference of the winding and flattening roller. The thickening layer is used to increase the diameter of the end of the winding and flattening roller and increase the friction force on the surface of the end of the winding and flattening roller; The metal wire conveying pipe is arranged along a parabolic trajectory, and the metal wire conveying pipe arches upward and then bends downward along the conveying path; The winding and flattening roller includes a mounting shaft and a winding roller. The winding roller is rotatably sleeved on the outer side of the mounting shaft. The mounting shaft has a curvature in the axial direction. The thickening layer is arranged on the outer side of the winding roller.

2. The metallized film manufacturing equipment according to claim 1, characterized in that: The radius R of the arc where the central axis of the installation shaft is located is [28500mm, 30000mm], and the arc height H of the installation shaft is [3mm, 5mm].

3. The metallized film manufacturing equipment according to claim 1 or 2, characterized in that: The thickening layer is configured as masking paper.

4. The metallized film manufacturing equipment according to claim 1, characterized in that: The pre-treatment device and the post-treatment device both include a cathode and an anode, and both the pre-treatment device and the post-treatment device treat the film surface with plasma.

5. The metallized film manufacturing equipment according to claim 1, characterized in that: There are two evaporation devices, one of which is used for evaporating aluminum, and the other is used for evaporating zinc.

6. The metallized film manufacturing equipment according to claim 1, characterized in that: The shielding oil device and the protective oil device both include an oil roller, and a heating structure is provided in the oil roller.

7. The metallized film manufacturing equipment according to claim 1, characterized in that: A circulation pipeline for introducing refrigerant is provided inside the cold drum.

8. A method for producing a metallized film, characterized in that: The manufacturing method is implemented based on the manufacturing equipment described in any one of claims 1 to 7, the manufacturing equipment is vacuumed to a set value, the winding device pulls the base film, the pre-treatment device performs surface polarization treatment on the base film, the shielding oil device evaporates the shielding oil and condenses it to the surface of the base film to form a shielding belt, the metal wire is transported to the evaporation boat along a curved trajectory and evaporates and adheres to the surface of the base film, the landing point of the metal wire on the evaporation boat is located in the high-temperature area in the middle of the evaporation boat, the protective oil device evaporates and condenses the protective oil to the surface of the film, the post-treatment device treats the surface of the film, the winding device winds the film, and the edge of the film is located in the area where the thickening layer is located; wherein, when the cold drum speed reaches 8m / s, the baffle of the evaporation device is opened; when the evaporation device evaporates metal aluminum, the conveying speed of the aluminum wire does not exceed 400mm / min.

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