JP6709498B2 - Method for producing aluminum foil and cathode drum for producing aluminum foil - Google Patents
Method for producing aluminum foil and cathode drum for producing aluminum foil Download PDFInfo
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本発明は、アルミニウム箔を電解析出法によって製造するアルミニウム箔の製造方法およびこれを製造するための陰極ドラムに関するものである。 The present invention relates to an aluminum foil manufacturing method for manufacturing an aluminum foil by electrolytic deposition and a cathode drum for manufacturing the same.
アルミニウム箔の製造方法として、アルミニウムイオンを含有した電解液からアルミニウムを電解還元により析出させる方法によってアルミニウム箔を作製する方法が知られている。例えば、陰極ドラムと陽極板がアルミニウム電解液を介して対向して配置されたアルミニウム箔の製造装置があり、陰極ドラムと陽極板の両極間に通電し、陰極ドラムを回転させながら陰極ドラムの電析面にアルミニウム被膜を析出させ、剥離させてアルミニウム箔を得る方法が知られている。（特許文献１） As a method of producing an aluminum foil, a method of producing an aluminum foil by a method of depositing aluminum by electrolytic reduction from an electrolytic solution containing aluminum ions is known. For example, there is an apparatus for manufacturing an aluminum foil in which a cathode drum and an anode plate are opposed to each other with an aluminum electrolytic solution in between, and electricity is applied to both electrodes of the cathode drum and the anode plate while rotating the cathode drum to rotate the cathode drum. A method is known in which an aluminum film is deposited on the deposition surface and peeled off to obtain an aluminum foil. (Patent Document 1)
具体的には、電解液槽にアルミニウム電解液を貯留して、このアルミニウム電解液に少なくとも一部が浸漬された電析面の面粗さＲａが０．１μｍ以上０．６μｍ以下の陰極ドラムと、この陰極ドラムに対向してアルミニウム電解液に浸漬された陽極板との間を通電することで、陰極ドラムにアルミニウム箔となるアルミニウム被膜を形成するものである。ここで、特許文献１では、面粗さＲａが０．１μｍ以上０．６μｍ以下の陰極ドラムを用いることで、表裏面が粗化形状のアルミニウム箔を得ることができるとされている。 Specifically, a cathode drum in which an aluminum electrolytic solution is stored in an electrolytic solution tank and at least a portion of which is immersed in the aluminum electrolytic solution has a surface roughness Ra of 0.1 μm or more and 0.6 μm or less. The aluminum film, which will be an aluminum foil, is formed on the cathode drum by energizing the space between the cathode drum and the anode plate immersed in the aluminum electrolytic solution. Here, in Patent Document 1, it is said that by using a cathode drum having a surface roughness Ra of 0.1 μm or more and 0.6 μm or less, an aluminum foil whose front and back surfaces are roughened can be obtained.
本発明者は、特許文献１に開示される製造装置によりアルミニウム箔の製造を試みたところ、電析面の面粗さＲａが０．１μｍ以上０．６μｍ以下の粗面化処理された陰極ドラムからアルミニウム被膜の剥離を開始する際に、アルミニウム被膜のエッジ部が陰極ドラムの電析面に固着してしまい、アルミニウム箔の破断やエッジ部に亀裂が発生する場合があることを確認した。このアルミニウム箔のエッジ部の破断の問題は、一度電解析出を停止して巻取りリールへの巻き直しという修復作業を伴い、製造効率の低下という問題に繋がる。
また、アルミニウム箔のエッジ部の亀裂の問題は、アルミニウム箔を切断（スリット）によりエッジ部をトリミングする際に亀裂等の不良部の切捨てが必要なり、切り捨て量が増大し歩留低下という問題に繋がる。
The present inventor tried to manufacture an aluminum foil with the manufacturing apparatus disclosed in Patent Document 1, and found that the surface-roughness Ra of the electrodeposited surface was 0.1 μm or more and 0.6 μm or less. It was confirmed that, when the peeling of the aluminum coating was started from, the edge of the aluminum coating was fixed to the electrodeposition surface of the cathode drum, and the aluminum foil might be broken or the edge might be cracked. The problem of breakage of the edge portion of the aluminum foil is accompanied by a repair work of once stopping electrolytic deposition and rewinding it on the take-up reel, leading to a problem of reduction in manufacturing efficiency.
In addition, the problem of cracks in the edge of the aluminum foil is that when trimming the edge of the aluminum foil by cutting (slitting), defective parts such as cracks need to be cut off, resulting in an increase in the amount of cutoff and a decrease in yield. Connect.
本発明の目的は、粗面化処理された陰極ドラムの電析面からアルミニウム箔を剥離する際の剥離性を改善したアルミニウム箔の製造方法およびアルミニウム箔の製造に用いる陰極ドラムを提供することである。 An object of the present invention is to provide a method for producing an aluminum foil having improved peelability when peeling the aluminum foil from the electrodeposited surface of the roughened cathode drum and a cathode drum used for producing the aluminum foil. is there.
本発明者は、粗面化処理された陰極ドラムの電析面からアルミニウム箔を剥離する際の剥離性の問題を検討し、粗面化された電析面の両端部に特定寸法の平滑部が形成された陰極ドラムの構成を採用することで、アルミニウム箔の製造効率、歩留、品質等を大きく改善できることを見出し、本発明に到達した。 The present inventor has studied the problem of releasability when peeling the aluminum foil from the electrodeposited surface of the roughened cathode drum, and has smoothed parts of specific dimensions at both ends of the roughened electrodeposited surface. The inventors have found that the production efficiency, yield, quality, etc. of the aluminum foil can be greatly improved by adopting the structure of the cathode drum in which is formed, and arrived at the present invention.
すなわち、本発明は、電解によってアルミニウム被膜を陰極ドラムの表面に析出させた後、そのアルミニウム被膜を陰極ドラムから剥離してアルミニウム箔を製造する方法において、アルミニウム被膜が析出する電析面に、表面粗さＲａ Ｃ が０．３μｍ〜０．６μｍである中央部の粗面部と、表面粗さＲａ Ｅ が０．０１μｍ〜０．０８μｍである両端部の平滑部とを有する陰極ドラムを用いてアルミニウム箔を得るアルミニウム箔の製造方法である。
前記両端部の平滑部のそれぞれの幅が前記粗面部の幅の０．１％〜１０．０％であることが好ましい。
前記電析面は、チタンからなることが好ましい。
That is, the present invention, after an aluminum film is deposited on the surface of the cathode drum by electrolysis, a process for producing a release to the aluminum foil the aluminum film from the cathode drum, the electrostatic析面the A aluminum film is deposited, Using a cathode drum having a central rough surface portion having a surface roughness Ra C of 0.3 μm to 0.6 μm and smooth portions at both end portions having a surface roughness Ra E of 0.01 μm to 0.08 μm It is a manufacturing method of an aluminum foil for obtaining an aluminum foil.
Before SL is preferably the width of each of the flat portions of both end portions of 0.1% to 10.0% of the width of said rough surface portion.
The electrodeposition surface is preferably made of titanium.
また、本発明は、陰極ドラムの電析面に形成されたアルミニウム被膜を剥離してアルミニウム箔を製造するために用いられる陰極ドラムにおいて、その陰極ドラムの電析面は、中央部の粗面部と両端部の平滑部とを有し、前記中央部の粗面部は表面粗さＲａ Ｃ が０．３μｍ〜０．６μｍ、前記両端部の平滑部は表面粗さＲａ Ｅ が０．０１μｍ〜０．０８μｍであるアルミニウム箔製造用陰極ドラムである。
前記両端部の平滑部のそれぞれの幅が前記粗面部の幅の０．１％〜１０．０％であることが好ましい。
前記電析面は、チタンからなることが好ましい。
Further, the present invention is a cathode drum used for producing an aluminum foil by peeling off the aluminum coating formed on the electrodeposition surface of the cathode drum, and the electrodeposition surface of the cathode drum is a rough surface portion at the center. possess a smooth portion of the both end portions, the central portion of the rough surface portion is a surface roughness Ra C is 0.3Myuemu～0.6Myuemu, smooth portion of the both end portions surface roughness Ra E is 0.01Myuemu～0. It is a cathode drum for producing aluminum foil having a thickness of 08 μm .
Before SL is preferably the width of each of the flat portions of both end portions of 0.1% to 10.0% of the width of said rough surface portion.
The electrodeposition surface is preferably made of titanium.
本発明によれば、アルミニウム箔の製造効率、歩留、品質等を改善することができ、アルミニウム箔の製造にとって有用な技術となる。 According to the present invention, the production efficiency, yield, quality, etc. of an aluminum foil can be improved, which is a useful technique for producing an aluminum foil.
上述したように、従来のアルミニウム箔を製造する装置においては、粗面化処理された陰極ドラムを用い、アルミニウム電解液を介して、その陰極ドラムと陽極板を対向して配置し、陰極ドラムを回転させながら陰極ドラム表面に箔となるアルミニウムを析出させ、これを剥離させてアルミニウム箔を得ることが開示されている。
この従来の粗面化処理された陰極ドラムを用いてアルミニウム箔を製造する場合は、陰極ドラムの電析面の両側は絶縁材で被覆されている。そして、両端の絶縁材の間の電析面にアルミニウム被膜が形成される。
しかしながら、粗面化処理された陰極ドラムの場合は、陰極ドラムの電析面に析出するアルミニウム被膜は、陰極ドラムの表面と絶縁材との境界部に電解電流が集中することにより、陰極ドラムの表面と絶縁材との隙間にも電解析出が生じる場合がある。このような場合、アルミニウム被膜を剥離する際に引っ掛かりを生じるため、アルミニウム被膜の剥離性は低下する。したがって、従来の粗面化処理された陰極ドラムを用いると、陰極ドラムに電析されたアルミニウム被膜を剥離しようとする際、アルミニウム被膜のエッジ部から亀裂を生じ、この亀裂が過度の場合はアルミニウム被膜が破断してしまうことがある。
As described above, in the conventional apparatus for producing an aluminum foil, a roughened cathode drum is used, and the cathode drum and the anode plate are arranged to face each other via the aluminum electrolytic solution, and the cathode drum is It is disclosed that aluminum which becomes a foil is deposited on the surface of the cathode drum while rotating and is peeled off to obtain an aluminum foil.
When an aluminum foil is manufactured using this conventional roughened cathode drum, both sides of the electrodeposition surface of the cathode drum are covered with an insulating material. Then, an aluminum film is formed on the electrodeposition surface between the insulating materials at both ends.
However, in the case of the roughened cathode drum, the aluminum coating deposited on the electrodeposited surface of the cathode drum causes the electrolytic current to concentrate at the boundary between the surface of the cathode drum and the insulating material. Electrolytic deposition may also occur in the gap between the surface and the insulating material. In such a case, when the aluminum coating is peeled off, a catch occurs, so that the peelability of the aluminum coating is lowered. Therefore, when the conventional roughened cathode drum is used, when an aluminum film electrodeposited on the cathode drum is to be peeled off, a crack is generated from the edge part of the aluminum film, and when the crack is excessive, aluminum is produced. The coating may break.
図１に、本発明の一実施形態の陰極ドラムの模式図を示す。この陰極ドラム１の電析面は、中央部の粗面部１Ｃと両端部の平滑部１Ｅとを有する。尚、平滑部１Ｅのさらに外側にはそれぞれ絶縁材１ｉが形成されている。この陰極ドラムを用いてアルミニウム箔を製造することにより、陰極ドラム１の粗面部１Ｃと平滑部１Ｅとから構成される電析面に形成されたアルミニウム被膜を、そのエッジ部において、破断や亀裂が発生することなく容易に電析面から剥離することができる。これは、アルミニウム被膜のエッジ部が形成される陰極ドラム１の電析面の両端部（平滑部１Ｅ）を、中央部（粗面部１Ｃ）に対して平滑化させたことによる。つまり、陰極ドラムの表面と絶縁材との隙間における電解析出を抑制したことと、アルミニウム被膜のエッジ部における電析面との密着性を低くしたことによる。
そして、本発明では、アルミニウム箔のエッジ部の破断が抑制されるため、電解析出を停止する必要がなく、連続してアルミニウム箔が得られ、製造効率の向上に寄与できる。
また、本発明では、得られるアルミニウム箔のエッジ部をトリミングするスリット幅が必要最小限になり、歩留低下を抑制することができる。
FIG. 1 shows a schematic view of a cathode drum of one embodiment of the present invention. The electrodeposition surface of this cathode drum 1 has a rough surface portion 1C at the center and smooth portions 1E at both ends. An insulating material 1i is formed on the outer side of the smooth portion 1E. By producing an aluminum foil using this cathode drum, the aluminum coating formed on the electrodeposition surface composed of the rough surface portion 1C and the smooth portion 1E of the cathode drum 1 has a rupture or a crack at its edge portion. It can be easily peeled from the electrodeposition surface without being generated. This is because both ends (smooth portions 1E) of the electrodeposition surface of the cathode drum 1 where the edge portion of the aluminum coating is formed are smoothed with respect to the central portion (rough surface portion 1C). That is, electrolytic deposition in the gap between the surface of the cathode drum and the insulating material was suppressed, and adhesion to the electrodeposition surface at the edge of the aluminum coating was lowered.
Further, in the present invention, since the breakage of the edge portion of the aluminum foil is suppressed, it is not necessary to stop the electrolytic deposition, and the aluminum foil can be continuously obtained, which can contribute to the improvement of the manufacturing efficiency.
Further, in the present invention, the slit width for trimming the edge portion of the obtained aluminum foil becomes the minimum necessary, and the yield reduction can be suppressed.
そして、本発明の陰極ドラムは、中央部の粗面部１Ｃは表面粗さＲａＣが０．１μｍ〜０．６μｍ、両端部の平滑部１Ｅは表面粗さＲａＥが０．０１μｍ〜０．１０μｍ、その両端部の平滑部１Ｅのそれぞれの幅が粗面部の幅の０．１％〜１０．０％とすることが好ましい。
ここで、本発明でいう表面粗さは、ＪＩＳ Ｂ ０６０１（２００１）で規定される算術平均粗さ（Ｒａ）で表わす。
陰極ドラムの電析面に形成される平滑部１Ｅの表面粗さＲａＥを０．０１μｍ未満にするためには、平滑化のための研磨作業に相当な時間を要するため、製造効率が低下するといった問題が生じる。本発明では、電析面に形成される平滑部１Ｅの表面粗さＲａＥを０．０１μｍ以上にすることで、容易に実現が可能なため、研磨作業に要する時間を短縮でき、製造効率が向上するという効果を得ることができる。
一方、陰極ドラムの電析面の両端部に形成される平滑部１Ｅの表面粗さＲａＥが０．１０μｍを超える場合には、陰極ドラムの表面と絶縁材１ｉとの隙間への電解析出が生じて、アルミニウム被膜のエッジ部から亀裂が生じ、この亀裂が過度の場合はアルミニウム被膜が破断するといった問題が生じる。本発明では、陰極ドラムの電析面に形成される平滑部１Ｅの表面粗さＲａＥが０．１０μｍ以下にすることで、陰極ドラムの表面と絶縁材１ｉとの隙間への電解析出を抑制できるという効果を得ることができる。
In the cathode drum of the present invention, the rough surface portion 1C at the center has a surface roughness Ra C of 0.1 μm to 0.6 μm, and the smooth portions 1E at both ends have a surface roughness Ra E of 0.01 μm to 0.10 μm. It is preferable that the width of each of the smooth portions 1E at both ends thereof be 0.1% to 10.0% of the width of the rough surface portion.
Here, the surface roughness referred to in the present invention is represented by an arithmetic average roughness (Ra) defined in JIS B 0601 (2001).
In order to reduce the surface roughness Ra E of the smooth portion 1E formed on the electrodeposited surface of the cathode drum to less than 0.01 μm, it takes a considerable amount of time for polishing work for smoothing, resulting in a decrease in manufacturing efficiency. Such a problem occurs. In the present invention, the surface roughness Ra E of the smooth portion 1E formed on the electrodeposited surface can be easily realized by setting it to 0.01 μm or more, so that the time required for the polishing operation can be shortened and the manufacturing efficiency can be improved. The effect of improving can be obtained.
On the other hand, when the surface roughness Ra E of the smooth portion 1E formed at both ends of the electrodeposition surface of the cathode drum exceeds 0.10 μm, electrolytic deposition in the gap between the surface of the cathode drum and the insulating material 1i. Occurs, and a crack is generated from the edge portion of the aluminum coating, and if the crack is excessive, the aluminum coating is broken. In the present invention, the surface roughness Ra E of the smooth portion 1E formed on the electrodeposited surface of the cathode drum is set to 0.10 μm or less to prevent electrolytic deposition in the gap between the surface of the cathode drum and the insulating material 1i. The effect that it can be suppressed can be obtained.
また、陰極ドラムの電析面に形成される平滑部１Ｅの幅が粗面部の幅の０．１％未満の場合には、陰極ドラムの表面と絶縁材１ｉとの隙間への電解析出が生じて、アルミニウム被膜のエッジ部から亀裂が生じ、この亀裂が過度の場合は、アルミニウム被膜が破断するといった問題が生じる。本発明では、陰極ドラムの電析面に形成される平滑部１Ｅの幅を粗面部の幅の０．１％以上にすることで、陰極ドラムの電析面に形成されたアルミニウム被膜のエッジ部に破断や亀裂を発生させることなく、容易に電析面から剥離することができるという効果を得ることができる。
一方、陰極ドラムの電析面に形成される平滑部１Ｅの幅が粗面部の幅の１０．０％を超える場合には、得られるアルミニウム箔のエッジ部をトリミングする幅が大きくなり、歩留低下という問題が生じる。本発明では、陰極ドラムの電析面に形成される平滑部１Ｅの幅を粗面部の幅の１０．０％以下にすることで、得られるアルミニウム箔のエッジ部をトリミングする幅が小さくなり、歩留低下を小さくするという効果を得ることができる。尚、このトリミングでは、中央部の粗面部で形成されたアルミニウム被膜部分のみとなるようにエッジ部を切断することにより、両面が同程度に粗面化処理されたアルミニウム箔を得ることができる。
Further, when the width of the smooth portion 1E formed on the electrodeposited surface of the cathode drum is less than 0.1% of the width of the rough surface portion, electrolytic deposition in the gap between the surface of the cathode drum and the insulating material 1i occurs. As a result, a crack is generated from the edge portion of the aluminum coating, and if the crack is excessive, the aluminum coating is broken. In the present invention, the width of the smooth portion 1E formed on the electrodeposited surface of the cathode drum is set to 0.1% or more of the width of the rough surface portion so that the edge portion of the aluminum coating formed on the electrodeposited surface of the cathode drum. It is possible to obtain the effect of easily peeling from the electrodeposited surface without causing breakage or cracks in the surface.
On the other hand, when the width of the smooth portion 1E formed on the electrodeposited surface of the cathode drum exceeds 10.0% of the width of the rough surface portion, the width for trimming the edge portion of the obtained aluminum foil becomes large and the yield The problem of deterioration occurs. In the present invention, by setting the width of the smooth portion 1E formed on the electrodeposited surface of the cathode drum to be 10.0% or less of the width of the rough surface portion, the width for trimming the edge portion of the obtained aluminum foil becomes small, The effect of reducing the yield reduction can be obtained. In this trimming, an aluminum foil whose both surfaces are roughened to the same extent can be obtained by cutting the edge portion so that only the aluminum coating portion formed by the rough surface portion in the central portion is formed.
本発明の陰極ドラムは、アルミニウム被膜が電解析出される電析面の中央部に粗面部１Ｃを設け、その粗面部１Ｃの表面粗さＲａＣを０．１μｍ〜０．６μｍにすることが好ましい。中央部の粗面部１Ｃの表面粗さＲａＣが０．１μｍ未満であると、アルミニウム箔の陰極ドラムから剥離した電析面（粗面部１Ｃから剥離された面）が粗化形状でなくなり、アルミニウム箔の両面間で特性差が発生するといった問題が生じる。本発明では、電析面の中央部の粗面部１Ｃの表面粗さＲａＣを０．１μｍ以上にすることで、アルミニウム箔の両面がどちらも粗化形状となり、両面間での特性差が小さくなるという効果を得ることができる。
一方、電析面の中央部の粗面部１Ｃの表面粗さＲａＣが０．６μｍを超えると、アルミニウム被膜と電析面の密着性が増加することによって、アルミニウム被膜の剥離が困難となり、アルミニウム箔を巻き取る際に、破断しやすくなるといった問題が生じる。本発明では、電析面の中央部の粗面部１Ｃの表面粗さＲａＣを０．６μｍ以下とすることで、安定して両面が粗化形状をなすアルミニウム箔を製造可能となる。尚、アルミニウム箔の電析面（粗面部１Ｃから剥離された面）に対向する表面の表面粗さは、例えば、先行技術文献に開示された方法等により、粗化形状とすることができる。
Cathode drum of the present invention, the central portion of the conductive aluminum film is electrolytically deposited析面the rough surface portion 1C provided, it is preferable that the surface roughness Ra C of the rough surface portion 1C to 0.1μm~0.6μm .. If the surface roughness Ra C of the central rough surface portion 1C is less than 0.1 μm, the electrodeposited surface of the aluminum foil peeled from the cathode drum (the surface peeled from the rough surface portion 1C) is not a roughened shape, and the aluminum There arises a problem that a characteristic difference occurs between both sides of the foil. In the present invention, by setting the surface roughness Ra C of the rough surface portion 1C at the center of the electrodeposited surface to 0.1 μm or more, both surfaces of the aluminum foil have a roughened shape, and the characteristic difference between both surfaces is small. The effect of becoming can be obtained.
On the other hand, when the surface roughness Ra C of the rough surface portion 1C at the center of the electrodeposited surface exceeds 0.6 μm, the adhesion between the aluminum coating and the electrodeposited surface increases, making it difficult to peel off the aluminum coating. When winding the foil, there arises a problem that the foil is easily broken. In the present invention, by setting the surface roughness Ra C of the rough surface portion 1C at the center of the electrodeposited surface to be 0.6 μm or less, it is possible to stably manufacture the aluminum foil having both roughened shapes. The surface roughness of the surface of the aluminum foil facing the electrodeposition surface (the surface separated from the rough surface portion 1C) can be made into a roughened shape by, for example, the method disclosed in the prior art document.
本発明の陰極ドラムは、例えば、ステンレス、アルミニウム、チタン等の円筒体を用いることができ、その中でも、チタン製の円筒体が好ましい。その理由は、チタンの表面に緻密で安定な酸化膜が形成されていることで、アルミニウム被膜の剥離性が良好になるためである。陰極ドラムの表面に緻密で安定な酸化膜がない場合は、アルミニウム被膜の剥離が不均一になる要因となる。
また、本発明の陰極ドラムの胴体は、製造するアルミニウム箔の寸法を考慮して、適宜設定することができ、例えば、直径が１００ｍｍ〜３０００ｍｍ、長さが１００ｍｍ〜２０００ｍｍのものが適用できる。
For the cathode drum of the present invention, for example, a cylindrical body made of stainless steel, aluminum, titanium or the like can be used, and among them, a cylindrical body made of titanium is preferable. The reason is that a dense and stable oxide film is formed on the surface of titanium, so that the peelability of the aluminum film is improved. If there is no dense and stable oxide film on the surface of the cathode drum, peeling of the aluminum coating becomes non-uniform.
Further, the body of the cathode drum of the present invention can be appropriately set in consideration of the dimensions of the aluminum foil to be manufactured, and for example, a body having a diameter of 100 mm to 3000 mm and a length of 100 mm to 2000 mm can be applied.
本発明の実施形態の一例を図２に示す。陰極ドラム１は、図１のように、電析面の中央部に粗面部１Ｃと両端部に平滑部１Ｅとを有する。そして、胴体の両端部に、絶縁材１ｉが被覆される。これは、得ようとするアルミニウム箔の幅を決定するためである。
そして、アルミニウム被膜が電解析出される電析面の中央部の粗面部１Ｃは、例えばブラストを用いて、表面粗さＲａＣが０．１μｍ〜０．６μｍとなるように調整されることが好ましい。また、電析面の両端から幅が粗面部の幅の０．１％〜１０．０％の部分は、例えば研磨紙を用いて、表面粗さＲａＥが０．０１μｍ〜０．１０μｍの平滑部１Ｅが形成されることが好ましい。
図２において、陰極ドラム１には、予め、電析面の少なくとも一部にリード材８を形成させておくことが好ましい。そして、リード材８の先端を剥離させた陰極ドラム１を、電解浴槽４に入れて陽極板２と対向して配置させ、リード材８が密着している陰極ドラム１の電析面の少なくとも一部をアルミニウム電解液５に浸漬させて、陰極ドラム１から剥離されたリード材８の先端を巻取りリール７に固定しておく。
次に、通電の開始によってアルミニウム電解液５に接しているリード材８の表面にアルミニウム被膜３を形成させながら、陰極ドラム１と巻取りリール７の回転を開始させ、巻取りリール７の引張力によって、リード材８を巻取り、アルミニウム電解液５の液面から露出したアルミニウム被膜３を連続して陰極ドラム１から剥離して巻取りリール７に巻取ることでアルミニウム箔を得ることができる。ここで、リード材８が全て陰極ドラムから剥離された後は、電析面に形成されたアルミニウム被膜そのものが剥離して巻取られる。
An example of the embodiment of the present invention is shown in FIG. As shown in FIG. 1, the cathode drum 1 has a rough surface portion 1C at the center of the electrodeposition surface and smooth portions 1E at both ends. Then, both ends of the body are covered with the insulating material 1i. This is to determine the width of the aluminum foil to be obtained.
Then, the rough surface portion 1C at the center of the electrodeposition surface on which the aluminum coating is electrolytically deposited is preferably adjusted, for example, by blasting so that the surface roughness Ra C is 0.1 μm to 0.6 μm. .. Further, a portion having a width of 0.1% to 10.0% of the width of the rough surface portion from both ends of the electrodeposited surface is smoothed with a surface roughness Ra E of 0.01 μm to 0.10 μm by using, for example, polishing paper. It is preferable that the portion 1E is formed.
In FIG. 2, the cathode drum 1 is preferably preliminarily formed with the lead material 8 on at least a part of the electrodeposition surface. Then, the cathode drum 1 from which the tip of the lead material 8 has been peeled off is placed in the electrolytic bath 4 and arranged so as to face the anode plate 2, and at least one of the electrodeposition surfaces of the cathode drum 1 to which the lead material 8 is in close contact is placed. The part is dipped in the aluminum electrolytic solution 5, and the tip of the lead material 8 separated from the cathode drum 1 is fixed to the take-up reel 7.
Next, the rotation of the cathode drum 1 and the take-up reel 7 is started while the aluminum coating 3 is formed on the surface of the lead material 8 in contact with the aluminum electrolyte solution 5 by the start of energization, and the pulling force of the take-up reel 7 is started. Thus, the lead material 8 is wound up, the aluminum coating film 3 exposed from the liquid surface of the aluminum electrolyte solution 5 is continuously peeled off from the cathode drum 1 and wound up on the winding reel 7, whereby an aluminum foil can be obtained. Here, after the lead material 8 is completely peeled off from the cathode drum, the aluminum coating itself formed on the electrodeposition surface is peeled off and wound up.
以下、本発明を実施例によって詳細に説明するが、本発明は以下の記載に限定して解釈されるものではない。
本実施例では、直径が１４０ｍｍ、胴長が３００ｍｍのチタン製の陰極ドラムを用いた。その陰極ドラムの胴体全面を、ブラスト法によってＲａ＝０．３μｍに粗化処理を行なった。次に、その粗化処理をした陰極ドラムの電析面の両端部に、研磨紙を用いて、ＲａＥ＝０．０８μｍとなるように研磨を行なった。そして、絶縁テープを用いて製造するアルミニウム箔の幅が２００ｍｍとなるように陰極ドラムの両側に絶縁材を固定した。これにより、電析面は、中央部の幅が１８０ｍｍの粗面部（ＲａＣ＝０．３μｍ）と、その両端に粗面部の幅の５．６％となるように、それぞれ幅が１０ｍｍの平滑部（ＲａＥ＝０．０８μｍ）が形成される構成とした。
Hereinafter, the present invention will be described in detail with reference to Examples, but the present invention should not be construed as being limited to the following description.
In this example, a titanium cathode drum having a diameter of 140 mm and a body length of 300 mm was used. The entire surface of the body of the cathode drum was roughened by a blast method to Ra=0.3 μm. Next, polishing paper was used to polish both ends of the electrodeposited surface of the roughened cathode drum so that Ra E =0.08 μm. Then, the insulating material was fixed on both sides of the cathode drum such that the width of the aluminum foil manufactured using the insulating tape was 200 mm. As a result, the electrodeposited surface had a rough surface (Ra C =0.3 μm) with a central width of 180 mm and a smooth surface with a width of 10 mm so that the width was 5.6% of the width of the rough surface at both ends. Part (Ra E =0.08 μm) is formed.
次に、図２のように、アルミニウム箔の初期の剥離や巻取りリールに巻取るために用いる銅めっき層から成るリード材を陰極ドラムの電析面に形成した。そして、このリード材の後端が密着した状態の陰極ドラムを、アルミニウム電解液が入ったアルミニウム箔製造装置に入れ、陰極ドラムに形成させたリード材の少なくとも一部をアルミニウム電解液に浸し、アルミニウム製の陽極板と対向させるように配置した。陰極ドラムから剥離させたリード材の先端は、箔引出口６を通って、巻取りリールにテープを用いて固定した。 Next, as shown in FIG. 2, a lead material composed of a copper plating layer used for initial peeling of the aluminum foil and winding on the winding reel was formed on the electrodeposition surface of the cathode drum. Then, the cathode drum with the rear end of the lead material in close contact is placed in an aluminum foil manufacturing apparatus containing an aluminum electrolytic solution, and at least a part of the lead material formed on the cathode drum is immersed in the aluminum electrolytic solution. It was arranged so as to face the anode plate made of. The leading end of the lead material separated from the cathode drum passed through the foil outlet 6 and was fixed to the take-up reel with tape.
アルミニウムの電解析出は、電流密度１００ｍＡ／ｃｍ２、液温１１０℃の条件で、アルミニウム電解液を撹拌させながら通電を行なった。陰極ドラムの表面に形成したリード材の表面の少なくとも一部にアルミニウムを電解析出させながら、陰極ドラムの回転および巻取りリールの回転を開始し、巻取りリールの引張力でリード材およびアルミニウム被膜を剥離させ、リード材が全て陰極ドラムから剥離された後は、電析面に形成されたアルミニウム被膜そのものが剥離して巻取られ、厚さが１２μｍ、幅が２００ｍｍのアルミニウム箔を巻取りリールに巻取った。形成されたアルミニウム箔の電析面（粗面部１Ｃから剥離された面）の表面粗さはＲａで０．３μｍであり、電析面に対向する表面の表面粗さはＲａで０．０８μｍであった。
本発明の製造方法では、陰極ドラムの電析面からのアルミニウム箔の剥離性が改善され、アルミニウム被膜のエッジ部が陰極ドラムの電析面の両端部に固着せず、アルミニウム箔の破断やエッジ部に亀裂が発生することがなかった。そして、表裏面が粗化形状のアルミニウム箔を製造することができた。
The electrolytic deposition of aluminum was carried out under the conditions of a current density of 100 mA/cm 2 and a liquid temperature of 110° C. while the aluminum electrolytic solution was stirred and electricity was applied. While electrolytically depositing aluminum on at least a part of the surface of the lead material formed on the surface of the cathode drum, the rotation of the cathode drum and the rotation of the winding reel are started, and the lead material and the aluminum coating film are pulled by the pulling force of the winding reel. After the lead material has been peeled off from the cathode drum, the aluminum coating itself formed on the electrodeposition surface is peeled off and wound up, and an aluminum foil having a thickness of 12 μm and a width of 200 mm is taken up on a reel. Rolled up. The surface roughness of the electrodeposited surface (the surface separated from the rough surface portion 1C) of the formed aluminum foil was 0.3 μm in Ra, and the surface roughness of the surface facing the electrodeposited surface was 0.08 μm in Ra. there were.
In the production method of the present invention, the releasability of the aluminum foil from the electrodeposited surface of the cathode drum is improved, the edge portion of the aluminum coating does not adhere to both ends of the electrodeposited surface of the cathode drum, and the aluminum foil is broken or edged. No crack was generated in the part. Then, it was possible to manufacture an aluminum foil whose front and rear surfaces were roughened.
１．陰極ドラム
２．陽極板
３．アルミニウム被膜
４．電解浴槽
５．アルミニウム電解液
６．箔引出し口
７．巻取りリール
８．リード材
1. Cathode drum 2. Anode plate 3. Aluminum coating 4. Electrolysis bath 5. Aluminum electrolyte 6. Foil outlet 7. Take-up reel 8. Lead material
Claims (6)
The cathode drum for producing an aluminum foil according to claim 4 or 5, wherein the electrodeposition surface is made of titanium.
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