JP2018135584A - Method for manufacturing aluminum foil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing an aluminum foil capable of improving productivity of an aluminum foil by an electroplating process by increasing a contact area of a cathode to enhance film deposition efficiency while avoiding upsizing of manufacturing facilities and complexity of manufacturing processes.SOLUTION: There is provided a method for manufacturing an aluminum foil depositing an aluminum coating on the surface of a cathode by performing energization between an anode and the cathode disposed through a conductive liquid, and continuously obtaining an aluminum foil by peeling the aluminum coating from the cathode. The cathode is a strip electrode moving in the conductive liquid.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an electroplating method, for example, a method for producing an aluminum foil used for an electricity storage device or the like.

  A copper foil or an aluminum foil is used as a current collector of an electricity storage device such as a lithium ion secondary battery or a super capacitor (such as an electric double layer capacitor, a redox capacitor, or a lithium ion capacitor). The copper foil is produced by a rolling method or an electroplating method (electroforming method, electrolytic method). Conventionally, aluminum foil has been produced exclusively by a rolling method, but it is difficult to produce a thin aluminum foil corresponding to the increase in the density of power storage devices, and therefore a production method using an electroplating method has been proposed ( Patent Document 1).

  Patent Document 1 discloses electrolytic aluminum in which aluminum is deposited on the surface of a horizontal cylindrical drum-type cathode (hereinafter referred to as “cathode drum”) facing the anode electrode through a plating solution to form a foil. A method for manufacturing a foil is disclosed. In patent document 1, in order to produce aluminum foil continuously with stable quality, the structure which forms the liquid flow of a plating solution toward the surface of a cathode is employ | adopted.

JP 2016-186105 A

  In manufacturing aluminum foil, not only stable quality as in Patent Document 1 is ensured, but also productivity improvement and cost reduction such as manufacturing cost are important issues. For example, in order to improve the production amount per equipment, it is effective to increase the electrode area (wetting area) of the cathode immersed in the plating solution.

  However, the cathode drum disclosed in Patent Document 1 is used by bringing the electrode surface into contact with the liquid while rotating the electrode surface about the axis of the drum because the peripheral surface of the drum is the electrode surface. Therefore, the cathode drum has a limited liquid contact area. Furthermore, in order to produce an aluminum foil having a uniform thickness, it is necessary to always keep the liquid contact area of the cathode drum constant during electroplating (during film formation). Therefore, high roundness is required for the cathode drum. In this respect, the member having the drum peripheral surface (electrode surface) and the member serving as the bottom surface (side wall) on which the drum shaft is installed are distorted, deformed, or positioned in cutting, molding, or welding of both members. Since problems such as deviation are likely to occur, it becomes difficult to manufacture a cathode drum having high roundness as the diameter of the cathode drum increases. Further, the entire cathode drum is generally made of a metal such as titanium. Therefore, as the cathode drum becomes larger, the weight increases, and the entire facility becomes large in order to support the weight.

  In particular, when power is supplied from the drum shaft (rotating shaft) as in the configuration disclosed in Patent Document 1, the position in the depth direction of the immersed portion is less than the radius of the drum. It must be set below the axis. Therefore, in order to increase the liquid contact area of the cathode drum, it is necessary to further increase the diameter of the drum, and the above problem becomes more remarkable. If the cathode drum is immersed in a plating solution with a dimension larger than its radius, in addition to insulation and sealing of the rotating shaft part, recovery of the plating solution that overflows or leaks from the peripheral part of the rotating shaft, etc. Since measures need to be taken, the equipment becomes quite complex.

  In view of the above problems, the present invention avoids the enlargement and complication of the production equipment, increases the wetted area of the cathode, increases the deposition efficiency, It aims at providing the structure which can improve the productivity of the aluminum foil by a plating method.

  According to the present invention, an aluminum film is deposited on the surface of the cathode by energizing between an anode and a cathode disposed via a conductive liquid, and the aluminum film is continuously peeled off from the cathode to form an aluminum foil. The cathode is a strip-shaped electrode that moves in the conductive liquid.

  Moreover, in the manufacturing method of the said aluminum foil, it is preferable that the part facing the said anode of the said strip | belt-shaped electrode is non-parallel with respect to a horizontal direction. Furthermore, it is preferable that the belt-like electrode moves while being folded in the vertical direction in the conductive liquid.

  In the method for manufacturing the aluminum foil, it is preferable that the belt-like electrode is stretched over a plurality of rollers including a driving roller, and the driving roller is disposed outside the conductive liquid.

  In the method for producing aluminum, the anode is preferably configured using a container having a plurality of through-holes communicating between the inside and the outside, and an electrode material stored inside the container. . Furthermore, it is preferable that the upper end of the electrode material is located above the liquid surface of the conductive liquid.

  According to the present invention, in an aluminum foil manufacturing method by an electroplating method, an enlargement and complexity of a manufacturing facility are avoided, a liquid contact area of a cathode is increased, film forming efficiency is increased, and an aluminum foil by an electroplating method is increased. It is possible to provide a configuration suitable for improving the productivity.

It is a figure which shows the structural example of the apparatus used for the manufacturing method of the aluminum foil which concerns on this invention. It is a figure which shows the other structural example of the apparatus used for the manufacturing method of the aluminum foil which concerns on this invention. It is a figure which shows the other structural example of the apparatus used for the manufacturing method of the aluminum foil which concerns on this invention. It is an enlarged view of the cross section of the barrel of the apparatus shown in FIG.

  The present invention energizes between an anode and a cathode disposed via a conductive liquid to deposit an aluminum film on the surface of the cathode, and peels the aluminum film from the cathode to continuously obtain an aluminum foil. It concerns on the manufacturing method of aluminum foil. Such a cathode is a strip electrode that moves in a conductive liquid. Such a strip electrode is light and has a simple configuration, and the wetted area can be gained by the strip surface extending in the length direction. Thereby, it is possible to prevent the apparatus from becoming complicated and large as in the case of using a cathode drum.

  Hereinafter, an embodiment of a method for producing an aluminum foil according to the present invention will be specifically described with reference to the drawings, taking a configuration example of an apparatus used therefor. In addition, this invention is not limited to the structure demonstrated below. Moreover, each structure demonstrated in this embodiment can be mutually combined as long as the function is not impaired.

<First Embodiment>
In FIG. 1, the structure used as an example of the apparatus used for embodiment of the manufacturing method of the aluminum foil of this invention is shown. FIG. 1 is a schematic view showing a cross section of the apparatus 100 in a direction perpendicular to the rotation shaft 8 of each roller described later. The plating bath 1 holds a conductive liquid 2 for electrolytically depositing aluminum, and an anode 3 and a cathode 4 are disposed through the conductive liquid 2.

As the conductive liquid 2, an electrolytic solution or a molten salt can be used. As the electrolytic solution, for example, a solution containing a dialkyl sulfone, an aluminum halide, and a nitrogen-containing compound can be used. Here, the nitrogen-containing compound is ammonium halide, hydrogen halide salt of primary amine, hydrogen halide salt of secondary amine, hydrogen halide salt of tertiary amine, general formula: R ¹ R ² R ³ R ⁴ At least one selected from the group consisting of a quaternary ammonium salt represented by N · X and a nitrogen-containing aromatic compound can be used. In the above general formula, R ^{1 to} R ⁴ are the same or different alkyl groups, and X represents a counter anion for the quaternary ammonium cation. The above electrolytic solution can be used while maintaining the liquid temperature at about 80 ° C. to 120 ° C. (preferably 100 ° C. to 110 ° C.).

  As the molten salt, for example, an organic molten salt that is a eutectic salt of an organic halide and an aluminum halide, or an inorganic molten salt that is a eutectic salt of an alkali metal halide and an aluminum halide may be used. it can. As the organic halide, an imidazolium salt, a pyridinium salt, or the like can be used. What is necessary is just to select liquid temperature according to the liquid physical property, for example, said molten salt can select the suitable temperature from the range of about 30 degreeC-200 degreeC, for example, and can use it maintaining the liquid temperature.

  The above-described electrolytic solution or molten salt dislikes moisture. Therefore, the plating bathroom 1 has a structure in which the inside is an atmosphere of an inert gas or the like, is sealed except for the aluminum foil outlet, and the inflow of air from the outside is blocked. The conductive liquid 2 is preferably circulated by a circulation device (not shown) and filtered by a filter or the like for purification.

  The anode 3 and the cathode 4 are connected to a power source (not shown) outside the plating bathroom 1. By energizing between the anode 3 and the cathode 4, aluminum is deposited and grows on the surface (liquid contact surface) of the cathode 4 immersed in the conductive liquid 2 to form an aluminum coating. The cathode 4 is a band-shaped electrode (ring belt-shaped electrode) configured in a ring shape, and is stretched over a plurality of rollers (a driving roller 5 and a driven roller 6) including the driving roller 5, and the rotation of the driving roller 5 is performed. Is configured to be able to move (run) in the conductive liquid 2. The anode 3 is disposed so as to cover a strip electrode (cathode 4) that is spanned by a plurality of rollers and immersed in the conductive liquid 2. With such a configuration, the liquid contact area can be increased by the strip-shaped surface extending in the length direction of the cathode 4, so that it is not necessary to increase the diameter of the drive roller 5 or the like. Therefore, compared with the conventional case where a cathode drum is used, the apparatus is significantly reduced in weight and the cathode can be easily manufactured.

  According to the apparatus having the configuration shown in FIG. 1 described above, the belt-like electrode (cathode 4) facing the anode 3 is rotated by rotating the belt-like electrode (cathode 4) while energizing between the anode 3 and the cathode 4. Aluminum can be deposited and grown on the surface to form an aluminum coating. And the aluminum foil 7 is continuously obtained by peeling an aluminum film from the strip | belt-shaped electrode (cathode 4) in the position shown by the arrow (dotted line) in FIG. Furthermore, a coiled aluminum foil is obtained by continuously winding the peeled aluminum foil 7. According to the method for producing an aluminum foil by electroplating, it is possible to obtain a thin aluminum foil which has been difficult in the past. The thickness of such an aluminum foil is, for example, 10 μm to 30 μm, and a particularly thin aluminum foil having a thickness of 5 μm or more and less than 10 μm can also be obtained.

  The material of the strip electrode which is the cathode 4 is not particularly limited. For example, a strip electrode made of Ti or Ti alloy is preferable because of its advantages such as lightness, mechanical strength, and ease of peeling of the deposited aluminum film. Moreover, the ring-shaped belt-like electrode (ring belt-like electrode) can be constituted by joining both ends of a belt-like plate material having a thickness of about 0.08 mm to 0.8 mm, for example. The strip electrode can adopt a multilayer structure with another conductor in addition to the structure made entirely of Ti or Ti alloy. In addition, it is also possible to use a strip electrode in which the material and characteristics in the width direction are changed, such as a configuration in which both ends of the strip electrode in the width direction (the direction of the rotation axis 8 of the roller) are covered with an insulator.

  Moreover, it is preferable that the reverse surface (surface on the side in contact with the roller) opposite to the aluminum deposition surface of the strip electrode is insulated so that aluminum is not deposited. Moreover, when providing the power supply part to a strip | belt-shaped electrode in this opposite surface, only the part required for electric power feeding is exposed, and the other part which does not participate in electric power feeding is insulated. The insulation treatment described above only needs to be stable with respect to the plating solution used, and means such as coating and tape masking can be used. Further, the power feeding unit is not necessarily provided on the roller side. For example, a configuration may be employed in which contact power supply terminal portions such as tabs are provided at both ends of the belt-like electrode, and the contact is secured by pressing the power supply roller near the drive roller 5. At this time, when the tab is in the liquid, in order to prevent aluminum from being deposited on the surface of the tab, the width of the anode (in the depth direction in FIG. 1) is made narrower than the width of the cathode to further shield it. It is preferable that an electric field is not applied to the tab by providing a plate.

  The anode 3 is configured using aluminum. The anode 3 is preferably arranged in a form that follows the surface shape of the cathode 4. In the configuration shown in FIG. 1, the anode 3 has a configuration in which a plurality of aluminum spheres are filled inside an insulating basket having an external shape that follows the surface shape of the cathode 4. Such a basket has a mesh-shaped outer shell so that the inside and the outside communicate with each other. Such an outer shell may be a plate-like body provided with an opening so that the inside and the outside communicate with each other. The anode 3 can be composed of an aluminum plate (single plate), but a container having a plurality of through-holes communicating between the inside and the outside, such as a basket, and an aluminum sphere stored in the container It is preferable to have a configuration using a simple electrode material. The electrode material made of a plurality of aluminum spheres can increase the film formation efficiency because the specific surface area is increased as compared with the electrode material made of a plate material.

  As the electrode material, a deformed aluminum piece may be used instead of the aluminum sphere. Aluminum spheres that are easy to roll are preferred, and the fluidity of the aluminum spheres in the container can be easily secured. The aluminum used as the electrode material preferably has a purity of 97% by mass or more, and more preferably is substantially pure aluminum containing 99.9% by mass or more of aluminum.

  Aluminum that becomes an electrode material dissolves into the conductive liquid 2 during energization and is consumed. The amount of aluminum consumed by continuous film formation can be replenished from above the basket. The upper end of the aluminum sphere stored in the basket can be positioned at a level lower than the level of the conductive liquid 2, but is preferably positioned at a level higher than the level of the conductive liquid 2. Yes, the uniformity of the thickness of the aluminum coating (aluminum foil) can be further increased.

  In the configuration shown in FIG. 1, the basket constituting the anode 3 is vertically long, and the portion of the strip electrode (cathode 4) facing the anode 3 is non-parallel to the horizontal direction (x direction). Specifically, the cathode 4 is configured such that a portion (plane portion) between a portion in contact with the driving roller 5 and a portion in contact with the driven roller 6 is perpendicular to the horizontal direction (x direction). ing. And the part (plane part) of the anode 3 which opposes this plane part is also comprised so that it may become perpendicular | vertical with respect to a horizontal direction (x direction). The portion of the anode 3 facing the portion (curved surface portion) of the cathode 4 that contacts the driven roller 6 is configured to follow the curved surface portion, in other words, curved to follow the outer periphery of the driven roller 6. It has a shape (curved part). According to this configuration, the distance between the anode 3 and the cathode 4 can be made substantially constant by the flat portion and the curved portion of the cathode 4 and the flat portion and the curved portion of the anode 3. The anode 3 shown in FIG. 1 has a divided structure, and the division position is below the curved portion. A region where the anode 3 does not exist is formed at the division position, and the flow path of the conductive liquid 2 can be secured by such a region. Thereby, the retention of the conductive liquid 2 that has entered between the anode 3 and the cathode 4 can be prevented.

  In the case of the apparatus configured in the vertical type (vertical type) shown in FIG. 1, the belt-like electrode serving as the cathode 4 moves in the conductive liquid 2 while being folded in the vertical direction (y direction). Instead of increasing the diameter of the driven roller 6, the distance between the driving roller 5 and the driven roller 6 is increased, and the length of the strip electrode immersed in the conductive liquid 2 is increased, thereby forming the aluminum film. Efficiency (production efficiency of aluminum foil) can be increased. Thereby, the installation area of an apparatus can be made small. For example, in the strip electrode, it is effective to make the length of the portion immersed in the conductive liquid 2 larger than the length of the portion exposed to the outside of the conductive liquid 2 (above the liquid surface). In addition, by arranging the strip electrode vertically (y direction), even if bubbles or suspended matters are generated in the conductive liquid 2, they stay on or adhere to the aluminum film deposited on the strip electrode. It is suppressed. Thereby, the effect of obtaining a high-quality aluminum foil can be expected. In addition, the position of either one or both of the driving roller 5 and the driven roller 6 is shifted in the horizontal direction (x direction), the plane portion of the belt-like electrode is inclined to be non-parallel to the horizontal direction (x direction), It is also possible to adopt a non-parallel (tilted) configuration. The flat portion of the strip electrode is preferably perpendicular (y direction) to the horizontal direction (x direction) from the viewpoint of the retention of bubbles and prevention of adhesion.

  As shown in FIG. 1, the following advantages can be expected by arranging a plurality of rollers across the belt-like electrode serving as the cathode 4 in the vertical direction (y direction). That is, in the configuration in which the strip electrode is spanned across a plurality of rollers including the driving roller 5, the driving roller 5 can be disposed outside the conductive liquid 2 (above the liquid level). When the driving roller is disposed in the conductive liquid 2 (below the liquid surface), measures such as insulation and sealing of the rotating shaft portion are required, and the facilities are considerably complicated. On the other hand, by disposing the entire drive roller 5 outside the conductive liquid 2, such a measure is not necessary, and the configuration of the facility is considerably simplified.

  As a configuration in which the driving roller 5 is disposed outside the conductive liquid 2, as long as the rotating shaft 8 is disposed outside the conductive liquid 2, a part of the lower side of the driving roller 2 is the conductive liquid 2. Even if it is in contact with the above, the above-described effects can be expected. Preferably, the entire drive roller 5 is disposed outside the conductive liquid 2, and the configuration of the facility can be further simplified. Further, by adding a guide roller, a horizontal path can be provided in the travel path of the strip electrode outside the conductive liquid 2. Thereby, the freedom degree of design of the running path of the strip electrode is increased, and a more suitable configuration can be pursued with respect to peeling of the aluminum coating from the strip electrode, handling of the peeled aluminum foil, and the like.

<Second Embodiment>
FIG. 2 shows another configuration example of the apparatus used in the embodiment of the aluminum foil manufacturing method of the present invention, which is different from the configuration shown in FIG. FIG. 2 is a schematic view showing a cross section of the apparatus 200 in a direction perpendicular to the rotation shaft 28 of each roller described later. The plating bath 21 holds a conductive liquid 22 for electrolytically depositing aluminum, and the anode 23 and the cathode 24 are arranged through the conductive liquid 22 in the configuration example shown in FIG. This is the same as in the first embodiment.

  The cathode 24 is a belt-shaped electrode (ring belt-shaped electrode) configured in a ring shape, and is stretched over a plurality of rollers (a driving roller 25 and a driven roller 26) including a driving roller 25. It is configured to be able to move (run) in the conductive liquid 22. The anode 23 and the cathode 24 are connected to a power source (not shown) outside the plating bath 21. By energizing between the anode 23 and the cathode 24, aluminum is deposited and grows on the surface (wetted surface) of the cathode 24 immersed in the conductive liquid 22, and an aluminum coating is formed.

  The horizontal (horizontal) device shown in FIG. 2 is shown in FIG. 1 in that the portion of the strip electrode (cathode 24) facing the anode 23 is parallel to the horizontal direction (x direction). Different from the configuration. Specifically, a plurality of rollers (a driving roller 25 and a driven roller 26) that bridge the belt-like electrode are arranged in the horizontal direction (x direction). The driving roller 25 and the driven roller 26 are arranged so that the rotation shaft 28 is above the liquid level of the conductive liquid 22. When the entire drive roller 25 is disposed in the conductive liquid 22 (below the height of the liquid level), measures such as insulation and sealing of the rotating shaft 28 are required, and the facilities are considerably complicated. On the other hand, by disposing the rotating shaft 28 of the drive roller 25 described above outside the conductive liquid 22 (above the liquid level), such a measure is not required and the configuration of the equipment is considerably simple. become.

  Of the strip-like electrode (cathode 24), a lower flat portion between the driving roller 25 and the driven roller 26 (planar portion) and a part of the portion (curved surface portion) in contact with the driving roller 25 and the driven roller 26 Is immersed in the conductive liquid 22. The anode 23 is composed of an aluminum plate (single plate), and is opposed to the lower flat portion of the strip electrode (cathode 24). Increasing the distance between the driving roller 25 and the driven roller 26 and increasing the length of the strip electrode immersed in the conductive liquid 22 increases the film formation efficiency of the aluminum coating (the production efficiency of the aluminum foil). Can do. That is, since the strip electrode can be used and the liquid contact area can be increased by its length, it is not necessary to increase the diameter of the drive roller 25 or the like. Therefore, the apparatus is significantly reduced in weight as compared with a conventional apparatus using a cathode drum, and the electrodes and the apparatus can be easily manufactured. The configuration shown in FIG. 2 is particularly advantageous for suppressing the size in the height direction (y direction) of the apparatus.

  As described in the first embodiment, the anode 23 of the strip electrode (cathode 24) is used from the viewpoint of preventing bubbles or suspended matter generated in the conductive liquid 22 from staying or adhering to the aluminum coating. It is preferable that the part facing the non-parallel to the horizontal direction (x direction). Therefore, the positions of the driving roller 25 and the driven roller 26 in the vertical direction (y direction) are shifted without being aligned in the vertical direction (y direction), and the lower flat portion of the belt-like electrode is tilted in the horizontal direction (x direction). On the other hand, it may be non-parallel and a non-parallel (tilted) configuration. However, from the viewpoint of preventing the retention of bubbles generated in the conductive liquid 22, the flat portion of the strip electrode (cathode 4) is configured to be a non-parallel inclined type rather than a horizontal type (horizontal type). Preferably, a non-parallel vertical configuration that is perpendicular (y direction) to the horizontal direction (x direction) as in the configuration shown in FIG. 1 is more preferable.

<Third Embodiment>
FIG. 3 shows another configuration example of the apparatus used in the embodiment of the aluminum foil manufacturing method of the present invention, which is different from the configuration shown in FIGS. FIG. 3 is a schematic view showing a cross section of the apparatus 300 in a direction perpendicular to the rotation shaft 38 of each roller described later. The plating bath 31 holds a conductive liquid 32 for electrolytically depositing aluminum, and the anode 33 and the cathode 34 are arranged through the conductive liquid 32. The configuration example shown in FIG. This is the same as the first embodiment) or the configuration example shown in FIG. 2 (second embodiment).

  The anode 33 is configured by arranging a plurality of cylindrical containers (hereinafter referred to as “barrels”), and the plurality of barrels 33a to 33j are filled with electrode materials such as a plurality of aluminum balls and aluminum pieces. Is done. In addition, it is preferably an aluminum sphere, and if it is a sphere that is easy to roll, the fluidity in the barrels 33a to 33j is increased. Further, the cathode 34 is a belt-like electrode (ring belt-like electrode) configured in a ring shape, and spans around a plurality of rollers (a driving roller 35 and a driven roller 36) including the driving roller 35. It is configured to be able to move (run) in the conductive liquid 32 by rotation. The configuration related to the cathode 34 of the vertical (vertical) device shown in FIG. 3 is the same as the configuration shown in FIG.

  Although the configuration of the anode 33 having a plurality of barrels described above is different from the configuration of the anode 3 shown in FIG. 1, a container having a plurality of through holes communicating between the inside and the outside, and the inside of the container are stored. It is one of the aspects comprised using an electrode material. 3, the plurality of barrels 33a to 33j constituting the anode 33 is a horizontal type in which the longitudinal direction of the barrel (the depth direction in FIG. 3) is horizontally arranged. For example, it may be a vertically placed type arranged vertically (y direction). In the configuration shown in FIG. 3, the configuration other than the anode 33 is the same as the configuration shown in FIG. 1, and the details refer to the description of the first embodiment described above.

  The anode 33 is configured to include the above-described plurality of barrels 33 a to 33 j that have the same axial direction as the rotation shaft 38 of the drive roller 35. FIG. 4 schematically shows a section perpendicular to the longitudinal direction of each of the barrels 33a to 33j (shown as barrel 400 in FIG. 4) in an enlarged manner. The barrel 400 includes a cylindrical barrel main body 42 having a plurality of through holes 41 on the outer wall, and a shaft 43 that can be energized through the inside of the barrel main body 42. The barrel main body 42 can be rotated by a driving force such as a motor through a gear 43 or the like with the shaft 43 as an axis. The barrel main body 42 is made of an insulating material, but the surface of the shaft 43 has a metal portion that can be energized. An aluminum sphere, an aluminum piece, or the like serving as an electrode material can be stored in a plurality of spaces 44 between the shaft 43 and the barrel main body 42. In the following description, it is assumed that the electrode material is a plurality of aluminum spheres.

  In the configuration shown in FIG. 3, the anode 33 is constituted by a plurality of barrels 33a to 33j filled with aluminum spheres. Thereby, since the specific surface area of an electrode becomes large compared with a board | plate material, electroplating efficiency (electrolysis efficiency) can be improved. Furthermore, it is preferable to rotate the barrels 33a to 33j, and the aluminum balls inside the barrels 33a to 33j can be appropriately stirred. As a result, even during the energization (during film formation), even if a sludge film is formed on the surface of the aluminum sphere, it is removed moderately, so the surface of the aluminum sphere is kept in a surface state that can react uniformly in a fresh state. Is done.

  The anode 33 shown in FIGS. 3 and 4 is configured by disposing an anode (electrode material) that dissolves in the conductive liquid 32 during film formation inside the barrels 33a to 33j. Therefore, the configuration is completely different from conventional barrel plating in which a film formation target is accommodated in the barrel and the film formation target is processed as a cathode. Note that the film formation target (film formation target surface) in the configuration shown in FIG. 3 is the surface (peripheral surface) of the strip electrode (cathode 34) that does not contact each roller.

  In the configuration shown in FIG. 4, a plurality of partition walls 45 erected from the inner wall of the barrel main body 42 toward the shaft 43 are provided. Such a partition wall 45 is not always necessary, but it is preferable to divide the space 44 inside the barrels 33 a to 33 j in the circumferential direction by a plurality of partition walls 45. Thereby, when the barrels 33a to 33j are rotated, the effect of stirring the aluminum spheres filled in the barrels 33a to 33j and the effect of preventing the aluminum spheres from being biased inside the barrels 33a to 33j are obtained. Therefore, an effect of increasing electroplating efficiency (electrolysis efficiency) can be expected.

  The barrel body 42 shown in FIG. 4 has a circular cross-sectional shape (outer shape), but is not limited to the circular outer shape, and may be a polygonal shape such as a regular hexagonal shape or a regular octagonal shape. Further, when the barrel main body has a polygonal shape, the partition wall standing position can be arranged at a polygonal corner position or at an intermediate position between the corners.

  The plurality of through holes 41 provided on the outer walls of the barrels 33a to 33j allow the conductive liquid 32 to enter and exit between the inside and the outside, and the aluminum spheres having an initial diameter before being used for film formation are externally provided. In order to prevent the aluminum spheres from dropping out, the aluminum spheres that have been consumed smaller than a predetermined diameter by continuous film formation are opened to the outside. Note that the aluminum spheres that have fallen out of the barrels 33a to 33j from the through holes 41 can be collected in the plating bath 31 or in the circulation path (not shown) of the plating solution.

  In the configuration shown in FIG. 4, the shaft 43 has a hollow structure having a hollow portion 46. With this hollow portion 46, fresh aluminum spheres can be fed from the end portion. Fresh aluminum spheres fed from the hollow portion 46 can be fed from a feed hole 47 that communicates the hollow portion 46 and the inside of the barrel body 42. Thus, fresh aluminum spheres can be replenished in the space 44 of the barrels 33a to 33j during film formation. Although the shaft 43 can also be configured to be rotatable, when the aluminum ball replenishment mechanism as described above is provided, the shaft 43 is fixed, and the barrel main body 42 is rotatably supported by the fixed shaft 43. It is preferable to configure so as to.

  The anode 33 in the configuration shown in FIGS. 3 and 4, that is, the anode 33 configured by filling a plurality of barrels 33 a to 33 j with an electrode material such as a plurality of aluminum spheres or aluminum pieces as an electrode material, It can be used in place of an anode made of an aluminum plate (single plate). For example, instead of the anode 22 in the configuration shown in FIG. 2 (second embodiment), a plurality of barrels in the configuration shown in FIGS. 3 and 4 (third embodiment) are arranged in the longitudinal direction of the aluminum plate. Can do.

1. Container, 2. 2. conductive liquid; Anode, 4. 4. cathode, Driving roller, 6. 6. Followed roller, Aluminum foil, 8. Rotation axis, 21. Container, 22. Conductive liquid, 23. Anode, 24. Cathode, 25. Drive roller, 26. Driven roller, 27. Aluminum foil, 28. Rotation axis, 31. Container, 32. Conductive liquid, 33. Anode, 33a-33j. Barrel, 34. Cathode, 35. Drive roller, 36. Driven roller, 37. Aluminum foil, 38. Rotation axis, 41. Through hole, 42. Barrel body, 43. Shaft, 44. Space, 45. Partition, 46. Hollow part, 47. Inlet hole, 100. Device, 200. Device, 300. Device 400. barrel

Claims (6)

  Aluminum that is energized between an anode and a cathode disposed via a conductive liquid to deposit an aluminum film on the surface of the cathode, and the aluminum film is peeled from the cathode to obtain an aluminum foil continuously. A method for producing an aluminum foil, wherein the cathode is a strip electrode that moves in the conductive liquid.   The method for producing an aluminum foil according to claim 1, wherein a portion of the strip electrode facing the anode is non-parallel to the horizontal direction.   The method for producing an aluminum foil according to claim 2, wherein the strip electrode moves while being folded back in the conductive liquid in a vertical direction.   The aluminum according to any one of claims 1 to 3, wherein the belt-like electrode is stretched over a plurality of rollers including a driving roller, and the driving roller is disposed outside the conductive liquid. Foil manufacturing method.   5. The anode according to claim 1, wherein the anode is configured using a container having a plurality of through-holes communicating between the inside and the outside, and an electrode material stored inside the container. The manufacturing method of the aluminum foil of Claim 1.   The method for producing an aluminum foil according to claim 5, wherein an upper end of the electrode material is located above a liquid level of the conductive liquid.