Manufacturing method and manufacturing equipment of metallized film

Abstract

The invention discloses a manufacturing method and manufacturing equipment of a metallized film. The manufacturing equipment comprises an unwinding device, a pretreatment device, a shielding oil device, a cold drum, a protective oil device, a post-treatment device and a winding device which are arranged at intervals in the conveying direction of a base film. The manufacturing equipment further comprises at least one evaporation device used for evaporating and plating metal to the base film on the surface of the cold drum, at least one evaporation device comprises an evaporation boat, a baffle and a metal wire conveying pipe, the evaporation boat is located on the lower side of the cold drum, and the metal wire conveying pipe is located on the upper side of the evaporation boat and arranged towards the evaporation boat in a bent mode. The winding device comprises 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 in a surrounding mode along the circumference of the winding and flattening roller, and the thickening layer is used for increasing the diameter of the end of the winding and flattening roller and increasing the friction force of the surface of the end of the winding and flattening roller. The method can be widely applied to the technical field of evaporation coating.

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 metal coating of the metallized film is divided into multiple small electrode grids by insulating gaps, and the grids are connected by narrow metal coatings, i.e. fuses. When a local breakdown occurs inside the capacitor, a large instantaneous current is generated to burn out the fuse around the electrode grid where the breakdown point is located, isolating the current so that the current cannot flow further from the breakdown point. The energy generated during the breakdown process is small, and the capacitor will not be severely damaged or even exploded, and the capacitor has a high safety protection level.

[0003] However, existing metallized films often have problems such as 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 use effect 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 a manufacturing device for a metallized film, and the technical solution adopted is as follows.

[0005] The manufacturing equipment of the metallized film provided in the present application 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 which are arranged at intervals along the conveying direction of the base film; the manufacturing equipment also comprises 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 comprises 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 comprises 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 on the surface of the end of the winding and flattening roller.

[0006] In certain embodiments of the present application, the wire conveying 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 thickened 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 [28500mm, 30000mm], and the arc height H of the installation shaft is [3mm, 5mm].

[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, the evaporation device is provided in two, wherein one of the evaporation devices is used for evaporating aluminum, and the other of the evaporation devices is used for evaporating 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 disposed inside the cold drum.

[0014] The method for making the metallized film provided in the present application is implemented 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, when the rotation speed of the cold drum reaches 8 m / s, the baffle of the evaporation device is opened; 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 the pre-treatment device, the shielding oil device, the cold drum, the protective oil device, the post-treatment device and the winding device in sequence from the unwinding device, and on the lower side of the cold drum, the evaporation boat evaporates the metal and condenses it to the surface of the base film to form a metal coating; In the evaporation device, a curved wire conveying pipe is used to convey the wire to the evaporation boat, so that the wire is fed to the high temperature area of ​​the evaporation boat, and the wire is prevented from being mistakenly delivered to the low temperature area of ​​the evaporation boat when being fed along a straight track, thereby improving the evaporation uniformity of the wire and further improving the uniformity of the metal coating; The winding and flattening roller in the winding device is provided with a thickening layer at the end, and the edge of the wound film is attached to the thickening layer. On the one hand, the thickening layer can change the diameter of the end of the winding and flattening roller, so that the film has a matching linear speed on the roller surface. On the other hand, the thickening layer can increase the friction of the film on the winding and flattening roller. The film is prevented from wrinkling by matching the linear speed and increasing the friction.

[0017] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present application is further illustrated below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments embodied in the following drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0019] Figure 1 It is a schematic diagram of the layout of various structures of the manufacturing equipment in this application.

[0020] Figure 2 This is a structural diagram of the winding and flattening roller in this application.

[0021] Figure 3 It is a schematic diagram of the structure of the aluminum evaporation device in this application.

[0022] Attached figures: 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

[0023] Combine the following 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 cannot be understood as limiting the present application.

[0024] In the description of the present application, it should be understood that 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 indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, and do 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 should not be understood as a limitation on the present application.

[0025] In the description of this application, "several" means more than one, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0026] In the description of this application, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example: it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0027] In the description of the present application, if there is a description with reference to the terms "one embodiment", "some embodiments", "an embodiment", "some examples", "some embodiments", "illustrative embodiment", "example", "specific example", "some examples", etc., 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 may be combined in any one or more embodiments or examples in a suitable manner.

[0028] 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 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 arranges shielding oil at a set position on the surface of the base film, at the cold drum 310, the base film is plated with a metal layer by evaporation, the protective oil device arranges 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.

[0029] It is understandable that the manufacturing equipment further includes at least one evaporation device, which is disposed close to 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 .

[0030] Specifically, at least one of the evaporation devices includes an evaporation boat and a baffle, the evaporation boat is located at the lower side of the cold drum 310, and the baffle is arranged between the evaporation boat and the cold drum 310. The evaporation boat is made of boron nitride, and the temperature of the evaporation boat can reach 1000°C to 1300°C. The high temperature of the evaporation boat melts the metal wire to achieve metal evaporation coating.

[0031] Furthermore, the evaporation device comprises a metal wire conveying pipe, which is located on the upper side of the evaporation boat, and the metal wire extends from the metal wire conveying pipe and is conveyed to the evaporation boat.

[0032] It should be noted that the metal wire conveying tube is bent toward the evaporation boat, and the metal wire conveying tube is arched upward and then bent downward along the conveying path, so that the metal wire is conveyed to the evaporation boat along a curved arc trajectory to avoid curling and deformation of the metal wire during heating. The curved metal wire conveying tube controls the landing point of the metal wire in the evaporation boat to be located in the high-temperature area in the middle of the evaporation boat, ensuring that the evaporation rate and the deposition rate tend to be balanced, avoiding uneven thickness of the metal coating due to changes in the evaporation rate, thereby ensuring uniform coating quality.

[0033] In the related art, the metal wire is fed to the evaporation boat along a straight line. Due to the influence of heat radiation on the metal wire, the metal wire is easy to become soft and bent, and the landing point of the metal wire in the evaporation boat is easy to deviate and become uncontrollable. In this case, the metal wire is easy to fall into the low temperature area in the evaporation boat, affecting the evaporation rate and deposition rate, and further affecting the uniformity of the metal coating.

[0034] In some examples, the metal wire conveying pipe is arranged along a parabolic trajectory, and the parabolic trajectory is reasonable, which is more conducive to conveying the metal wire to the central area of ​​the evaporation boat.

[0035] 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.

[0036] Furthermore, a thickening layer 122 is provided at 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 and is arranged around 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 end surface 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.

[0037] In some examples, the thickened layer 122 is configured as a masking paper.

[0038] 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 sleeved 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 can be understood that the winding roller 124 rotates on the mounting shaft 123 to wind up the film.

[0039] 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 .

[0040] 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.

[0041] Furthermore, the mounting shaft 123 has a curvature in the axial direction, and the mounting shaft 123 is bent along its length direction to have an arc. The mounting shaft 123 is fixedly mounted on the frame of the winding device, and the mounting shaft 123 can be rotated to adjust the mounting shaft 123. The user rotates the mounting shaft 123 and fixes the rotated mounting shaft 123, thereby adjusting the flattening and tensioning of the film by the side wall of the winding roller 124.

[0042] In some examples, the radius R of the arc where the central axis of the installation shaft 123 is located is [28500mm, 30000mm], and the arc height H of the installation shaft 123 is [3mm, 5mm]. It should be noted that the arc height H refers to the height difference between the center point of the end of the installation shaft 123 and the midpoint of the central axis of the installation shaft 123.

[0043] In some embodiments, the pre-treatment device 210 includes a cathode and an anode, and the pre-treatment device 210 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, and an inert gas is introduced between the cathode and the anode. Further, the inert gas is argon.

[0044] It can be understood that, during the evaporation 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 surface of the base film.

[0045] In some embodiments, the shielding oil device includes an oil roller, and a heating structure is provided in the oil roller. Specifically, under the action of the heating structure, the shielding oil is heated to 100° C. to 160° C. After evaporation, the shielding oil condenses to a set area on the surface of the base film, forming a shielding belt on the surface of the base film.

[0046] Furthermore, the shielding oil device includes a shielding oil pipe, and the shielding oil pipe is used to transport shielding oil to the oil roller. In some examples, the shielding oil is fluorine oil.

[0047] In some embodiments, two evaporation devices are provided. Specifically, one evaporation device is used to evaporate aluminum, serving as an aluminum evaporation device 320, and the other evaporation device is used to evaporate zinc, serving as a zinc evaporation device 330. The aluminum coating layer is evaporated first, and then the zinc coating layer is evaporated, thereby forming a zinc-aluminum metal layer on the surface of the base film.

[0048] 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.

[0049] In some embodiments, the cold drum 310 is cylindrical and is a metal roller. One side surface of the base film is attached to the side surface of the cold drum 310, and the other side surface of the base film is used for metal coating.

[0050] It should be noted that a circulating pipeline for introducing a refrigerant is provided inside the cold drum 310. Under the action of the refrigerant, the surface temperature of the cold drum 310 is 0 to -20°C. The metal vapor is cooled and adheres to the surface of the base film to form a metal electrode. Since the shielding belt formed by the shielding oil on the surface of the base film has a low surface tension, the metal molecules cannot adhere, forming an insulating gap without a metal electrode.

[0051] 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.

[0052] If the vacuum is not met, the aluminum will react with oxygen in the air during the evaporation process to form non-conductive Al 2 O3 , the metal coating required for the metallized film cannot be obtained.

[0053] In some embodiments, the protective oil device includes an oil roller, and a heating structure is provided in the oil roller. Specifically, under the action of the heating structure, the protective oil is heated to 100° C. to 160° C. After evaporation, the protective oil condenses on the surface of the film, forming a protective oil film on the surface of the metal coating.

[0054] Furthermore, the protective oil is composed of silicone oil.

[0055] In some embodiments, the post-treatment device 220 includes a cathode and an anode, and the post-treatment device 220 treats the membrane surface with plasma. The anode is connected to a high-voltage DC power supply, and the power supply power is 5kW to 15kW, and an inert gas is introduced between the cathode and the anode. Further, the inert gas is argon.

[0056] It is understandable that during the evaporation process, the post-treatment device 220 forms plasma, and the plasma treats the surface of the film. The protective oil film on the surface of the metal layer can be cross-linked to a certain extent under the action of the plasma, thereby forming a more stable protective oil film.

[0057] 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.

[0058] 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.

[0059] It should be noted that the base film is a 2.4 μm polypropylene film or polyester film.

[0060] 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.

[0061] When the manufacturing equipment is evacuated, the shielding oil pipe of the shielding oil device is returned to the waiting position to avoid scalding the film due to the overheating 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.

[0062] Specifically, the vacuum degree does not exceed 10 -2Under normal atmospheric pressure, 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 a metal layer required for the metallization film.

[0063] It should be noted that when the speed of the cold drum 310 reaches 8 m / s, the damper of the evaporation device is opened. If the damper is opened too quickly, the film will be broken when the plating starts, because the speed is slow and the temperature of the evaporation boat is high when the plating starts, which can easily damage the base film.

[0064] When the evaporation device evaporates metal aluminum, the conveying speed of the aluminum wire does not exceed 400mm / min to prevent the thermal radiation caused by aluminum evaporation from damaging the base film. On the other hand, by controlling the temperature of the evaporation boat during the evaporation process, the overall evaporation boat power is controlled to 90%. This can effectively reduce the thermal radiation of the evaporation boat to the base film. If the thermal radiation of the evaporation boat to the base film is too high, it is easy to cause the film to break during the evaporation process.

[0065] The above is a detailed description of the implementation methods of the present application in conjunction with the accompanying drawings, but the present application is not limited to the above implementation methods. Various changes can be made within the knowledge of 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 in the embodiments can be combined with each other without 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 cold 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 comprises 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 comprises an evaporation boat, a baffle and a metal wire conveying pipe, the evaporation boat is located at the lower side of the cold drum, the metal wire conveying pipe is located at 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, and a thickening layer is provided at at least one end of the winding and flattening roller. The thickening layer is arranged on the surface of the winding and flattening roller and 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 increase the friction force on the surface of the end of the winding and flattening roller.

2. The metallized film manufacturing equipment according to claim 1, characterized in that: The metal wire conveying pipe is arranged in a curved manner along a parabolic trajectory.

3. The metallized film manufacturing equipment according to claim 1, characterized in that: The winding and flattening roller comprises a mounting shaft and a winding roller, wherein the winding roller is rotatably sleeved on the outer side surface of the mounting shaft, the mounting shaft has a curvature in the axial direction, and the thickening layer is arranged on the outer side surface of the winding roller.

4. The metallized film manufacturing equipment according to claim 3, 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].

5. The metallized film manufacturing equipment according to claim 1, 3 or 4, characterized in that: The thickening layer is configured as masking paper.

6. 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.

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

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

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

10. A method for producing a metallized film, characterized in that: The production method is implemented based on the manufacturing equipment as described in any one of claims 1 to 9, 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; 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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