JP6936955B2

JP6936955B2 - Cathode drum for metal leaf manufacturing and metal leaf manufacturing method

Info

Publication number: JP6936955B2
Application number: JP2017180141A
Authority: JP
Inventors: 松田　純一; 純一松田; 篤志岡本
Original assignee: Hitachi Metals Ltd
Current assignee: Proterial Ltd
Priority date: 2016-09-30
Filing date: 2017-09-20
Publication date: 2021-09-22
Anticipated expiration: 2037-09-20
Also published as: JP2018059191A

Description

本発明は、例えばアルミニウム箔などの電解析出法による製造に好適な金属箔製造用陰極ドラムおよび金属箔の製造方法に関する。 The present invention relates to a cathode drum for producing a metal foil and a method for producing a metal foil, which are suitable for producing an aluminum foil or the like by an electrolytic precipitation method.

従来、金属イオンを含有する電解液から金属を電解還元により析出させる方法によって金属箔を作製する電解析出法が知られている。例えば、特許文献１にはアルミニウムイオンを含有する電解液を用いたアルミニウム箔の製造方法が開示され、特許文献２には銅イオンを含有する電解液を用いた銅箔の製造方法が開示されている。特許文献１、２には、陰極ドラムの胴体表面（外周面）の有効電解域を含む部分と陽極部材とを電解液中に浸漬し、その両者が対向配置された状態とし、陰極ドラムを回転しながら陰極ドラムの胴体表面と陽極部材との間で通電し、陰極ドラムの胴体表面に析出した金属膜を連続的に剥離して金属箔を形成し、前記金属箔を箔引出し口から連続的に引出して巻取りリールに巻取る製造方法および製造装置が開示されている。なお、特許文献１、２には、陰極ドラムの胴体表面に析出した金属膜の剥離を開始するための具体的な方法は開示されていない。 Conventionally, an electrolytic precipitation method for producing a metal foil by a method of precipitating a metal from an electrolytic solution containing metal ions by electrolytic reduction is known. For example, Patent Document 1 discloses a method for producing an aluminum foil using an electrolytic solution containing aluminum ions, and Patent Document 2 discloses a method for producing a copper foil using an electrolytic solution containing copper ions. There is. In Patent Documents 1 and 2, a portion including an effective electrolytic region on the body surface (outer peripheral surface) of the cathode drum and an anode member are immersed in an electrolytic solution so that both are arranged to face each other, and the cathode drum is rotated. While energizing between the body surface of the cathode drum and the anode member, the metal film deposited on the body surface of the cathode drum is continuously peeled off to form a metal foil, and the metal foil is continuously discharged from the foil outlet. A manufacturing method and a manufacturing apparatus for drawing out and winding on a take-up reel are disclosed. Note that Patent Documents 1 and 2 do not disclose a specific method for initiating peeling of the metal film deposited on the body surface of the cathode drum.

陰極ドラムの胴体表面に析出した金属膜の剥離を開始するための具体的な方法は、例えば特許文献３に開示されている。特許文献３には、金属箔（鉄箔）をリード材に用いる電解鉄箔の製造方法が開示されている。鉄箔からなるリード材（リード金属箔）の前方部分を巻取りリールに取り付け、そのリード金属箔の後方部分を陰極ドラムの胴体表面の有効電解域のほぼ全域に巻取りリールの引張り力により離脱可能な程度の接着力をもつ両面接着テープで取り付ける方法が開示されている。また、かかるリード金属箔は、電解液中の金属（鉄）が析出可能な材質であればよいとされ、金属（鉄）の析出が可能な同質の鉄箔（厚さ２０μｍ）をリード金属箔かつ析出用基材として用いて、回転（自転）する陰極ドラムの胴体表面に析出した金属膜（鉄膜）の剥離を開始することができた旨の具体的な記載がある。 A specific method for initiating peeling of the metal film deposited on the body surface of the cathode drum is disclosed in, for example, Patent Document 3. Patent Document 3 discloses a method for producing an electrolytic iron foil using a metal foil (iron foil) as a lead material. The front part of the lead material (lead metal foil) made of iron foil is attached to the take-up reel, and the rear part of the lead metal foil is separated by the tensile force of the take-up reel over almost the entire effective electrolytic region on the body surface of the cathode drum. A method of attaching with a double-sided adhesive tape having a possible degree of adhesive strength is disclosed. Further, the lead metal foil may be any material as long as the metal (iron) in the electrolytic solution can be deposited, and the same quality iron foil (thickness 20 μm) capable of depositing the metal (iron) is used as the lead metal foil. In addition, there is a specific description that the metal film (iron film) deposited on the body surface of the rotating (rotating) cathode drum could be started to be peeled off by using it as a substrate for precipitation.

特開２０１２−２４６５６１号公報Japanese Unexamined Patent Publication No. 2012-246651 特開２０１５−２１１５４号公報Japanese Unexamined Patent Publication No. 2015-21154 特開昭６３−６５０９５号公報Japanese Unexamined Patent Publication No. 63-65095

本発明者は、特許文献３に記載のリード金属箔（鉄箔）を用いて陰極ドラムの胴体表面に析出した金属膜の剥離を開始する方法を適用し、陰極ドラムの胴体表面に析出したアルミニウム膜を剥離して巻き取る電解析出法によるアルミニウム箔の製造を試行した。その試行では、特許文献３に記載の鉄箔に替えて、平均厚さが２０μｍの銅箔（リード金属箔）を陰極ドラムの純チタン製の胴体表面に取り付けた。そして、リード金属箔（銅箔）の前方部分を巻取りリールに取り付け、その後方部分を陰極ドラムの胴体表面の有効電解域の幅方向のほぼ全域に両面接着テープで取り付けた。その後、リード金属箔（銅箔）を取り付けた状態の陰極ドラムの胴体表面の一部およびリード金属箔の後方領域を含む部分を陽極部材が浸漬された電解液に浸漬した。続いて、胴体表面と陽極部材との間で通電するとともに陰極ドラムを回転することにより、リード金属箔の後方領域を含む部分の表面上およびそれに続く陰極ドラムの胴体表面にアルミニウムを析出させてアルミニウム膜を形成した。したがって、リード金属箔の後方領域を含む部分は、図１に示すように、リード金属箔２００の後方端２００ｅを含む後方領域２００ａの表面上に析出したアルミニウム膜１００ａを有する２層構造となる。また、リード金属箔２００の後方端２００ｅに隣接する陰極ドラムの胴体表面１ａには、アルミニウム膜１００ａに繋がってアルミニウム膜１００ｂが析出し、そのアルミニウム膜１００ａによる１層構造となる。このとき、リード金属箔２００の後方端２００ｅを含む後方領域２００ａは、リード金属箔２００と、剥離されてアルミニウム箔となるアルミニウム膜１００ｂとの継ぎ目部分になる。 The present inventor has applied a method of initiating peeling of a metal film deposited on the body surface of a cathode drum using the lead metal foil (iron foil) described in Patent Document 3, and aluminum deposited on the body surface of the cathode drum. An attempt was made to produce an aluminum foil by an electrolytic precipitation method in which the film was peeled off and wound up. In that trial, instead of the iron foil described in Patent Document 3, a copper foil (lead metal leaf) having an average thickness of 20 μm was attached to the surface of a pure titanium fuselage of a cathode drum. Then, the front part of the lead metal foil (copper foil) was attached to the take-up reel, and the rear part thereof was attached to almost the entire width direction of the effective electrolysis region on the body surface of the cathode drum with double-sided adhesive tape. Then, a part of the body surface of the cathode drum with the lead metal foil (copper foil) attached and the part including the rear region of the lead metal foil were immersed in the electrolytic solution in which the anode member was immersed. Subsequently, by energizing between the body surface and the anode member and rotating the cathode drum, aluminum is deposited on the surface of the portion including the rear region of the lead metal foil and on the body surface of the cathode drum that follows, and aluminum is deposited. A membrane was formed. Therefore, as shown in FIG. 1, the portion including the rear region of the reed metal foil has a two-layer structure having an aluminum film 100a deposited on the surface of the rear region 200a including the rear end 200e of the reed metal foil 200. Further, on the body surface 1a of the cathode drum adjacent to the rear end 200e of the lead metal foil 200, the aluminum film 100b is deposited in connection with the aluminum film 100a, and the aluminum film 100a forms a one-layer structure. At this time, the rear region 200a including the rear end 200e of the reed metal foil 200 becomes a joint portion between the reed metal foil 200 and the aluminum film 100b which is peeled off to become an aluminum foil.

上述した試行では、回転（自転）している陰極ドラムの胴体表面１ａからアルミニウム膜１００ｂを剥離する際に、リード金属箔２００とアルミニウム膜１００ｂとの継ぎ目部分（リード金属箔２００の後方端２００ｅを含む部分）で破損が発生した。また、アルミニウム膜１００ｂやそれに繋がるアルミニウム膜の剥離により形成されたアルミニウム箔には、局所的な厚さの変動や析出不良、変色、色むらなどが発生した。こうした不具合は、陰極ドラムの胴体表面１ａからリード金属箔２００の厚さ（平均厚さ２０μｍ）分の高さを有する絶壁面形状の後方端２００ｅ近傍への電解集中、胴体表面１ａに残存する粘着テープの粘着物（残渣）、あるいはリード金属箔２００と胴体表面１ａとの間に形成された粘着テープの厚さ分の隙間への電解液の滲入などに起因するものと考えられた。 In the above-mentioned trial, when the aluminum film 100b is peeled off from the body surface 1a of the rotating (rotating) cathode drum, the joint portion between the lead metal foil 200 and the aluminum film 100b (the rear end 200e of the lead metal foil 200) is formed. Damage occurred in the part including). Further, in the aluminum foil formed by peeling the aluminum film 100b and the aluminum film connected to the aluminum film 100b, local thickness variation, poor precipitation, discoloration, color unevenness and the like occurred. Such defects are caused by electrolytic concentration from the body surface 1a of the cathode drum to the vicinity of the rear end 200e of the cliff shape having a height equivalent to the thickness of the lead metal foil 200 (average thickness 20 μm), and adhesion remaining on the body surface 1a. It was considered that this was caused by the adhesive material (residue) of the tape or the infiltration of the electrolytic solution into the gap corresponding to the thickness of the adhesive tape formed between the lead metal foil 200 and the body surface 1a.

本発明の目的は、回転（自転）する陰極ドラムの胴体表面に析出した金属膜とリード材の後方端を含む継ぎ目部分での破損や、金属箔の局所的な厚さの変動や析出不良、変色、色むらが抑制され、析出した金属膜を剥離して健全な金属箔を形成し、その金属箔を連続的に巻取ることができる、金属箔製造用陰極ドラムおよび金属箔の製造方法を提供することである。 An object of the present invention is damage at a joint portion including a metal film deposited on the body surface of a rotating (rotating) cathode drum and a rear end of a lead material, local thickness fluctuation of the metal foil, and poor precipitation. A method for producing a cathode drum for producing a metal foil and a method for producing a metal foil, which can suppress discoloration and color unevenness, peel off the deposited metal film to form a sound metal foil, and continuously wind the metal foil. To provide.

本発明者は、上述した不具合の発生状況を詳細に分析するとともに、平均厚さが２０μｍの銅箔をリード材に用いて陰極ドラムの胴体表面に析出した金属膜の剥離を開始する方法を詳細に検討し、リード材（銅箔）の陰極ドラムの胴体表面に対する十分な密着性と、そのリード材の後方端を含む後方領域の形態が重要であることを見出し、本発明に到達した。 The present inventor analyzes in detail the occurrence of the above-mentioned defects, and details a method of starting peeling of the metal film deposited on the body surface of the cathode drum by using a copper foil having an average thickness of 20 μm as the lead material. The present invention was reached after finding that sufficient adhesion of the lead material (copper foil) to the body surface of the cathode drum and the morphology of the rear region including the rear end of the lead material are important.

すなわち、本発明の金属箔製造用陰極ドラムは、胴体表面の有効電解域に形成された金属膜を剥離して金属箔を形成するために用いられる陰極ドラムであって、前記胴体表面から結晶組織が繋がって前記胴体表面の有効電解域の一部を被うリード金属膜と、前記リード金属膜の前記陰極ドラムの回転方向の前方端部から結晶組織が繋がるとともに前記陰極ドラムから離れるリード金属箔と、を有し、前記リード金属膜の前記陰極ドラムの回転方向の後方領域には、前記リード金属膜の後方端に向かって厚さが小さくなる厚さ傾斜部を備えている。 That is, the metal foil manufacturing cathode drum of the present invention is a cathode drum used for peeling a metal film formed in an effective electrolytic region on the body surface to form a metal foil, and has a crystal structure from the body surface. A lead metal film that is connected to cover a part of the effective electrolytic region on the body surface, and a lead metal foil that connects the crystal structure from the front end of the lead metal film in the rotational direction of the cathode drum and separates from the cathode drum. And, the rear region of the lead metal film in the rotation direction of the cathode drum is provided with a thickness inclined portion whose thickness decreases toward the rear end of the lead metal film.

前記リード金属膜の前記後方端の平均厚さが、３μｍ以上であるとともに、前記金属箔の平均厚さの７０％以下であることが好ましい。
前記リード金属膜の前記後方端の平均厚さが、５μｍ以上であることが好ましい。
また、前記リード金属膜の平均厚さが、１０μｍ以上５０μｍ以下であることが好ましい。 It is preferable that the average thickness of the rear end of the lead metal film is 3 μm or more and 70% or less of the average thickness of the metal foil.
The average thickness of the rear end of the lead metal film is preferably 5 μm or more.
Further, it is preferable that the average thickness of the lead metal film is 10 μm or more and 50 μm or less.

上述した本発明の金属箔製造用陰極ドラムを用いた電解析出法により、例えばアルミニウム箔など各種の金属箔（電解金属箔）を連続的に製造することができる。
すなわち、本発明の金属箔の製造方法は、上述した本発明の金属箔製造用陰極ドラムを用いて、前記リード金属膜を有する前記胴体表面の一部を陽極部材が浸漬された電解液中に浸漬し、かつ、前記リード金属箔の巻取り方向の前方端部を巻取りリールに固定し、前記胴体表面と前記陽極部材の間の通電により、前記電解液に浸漬された前記リード金属膜の前記後方領域を含む部分の表面上に第１金属膜を形成し、前記通電を継続するとともに、前記陰極ドラムおよび前記巻取りリールを回転して前記リード金属箔を引くことにより、前記リード金属膜を剥離して前記リード金属箔から繋がる第２リード金属箔を形成し、さらに、前記陰極ドラムおよび前記巻取りリールを回転して前記第２リード金属箔を引くことにより、前記第１金属膜を表面上に有する前記リード金属膜の前記後方領域を含む部分を前記胴体表面から剥離し、続いて、前記第１金属膜から繋がって前記胴体表面に形成された第２金属膜を前記胴体表面から連続的に剥離して形成した金属箔を前記巻取りリールに連続的に巻取る方法である。 By the electrolytic precipitation method using the cathode drum for producing metal foil of the present invention described above, various metal foils (electrolytic metal foil) such as aluminum foil can be continuously produced.
That is, in the method for producing a metal foil of the present invention, using the above-mentioned cathode drum for producing a metal foil of the present invention, a part of the body surface having the lead metal film is immersed in an electrolytic solution in which an anode member is immersed. The lead metal film immersed in the electrolytic solution by being immersed and fixing the front end portion of the lead metal foil in the winding direction to the winding reel and energizing between the body surface and the anode member. The lead metal film is formed by forming a first metal film on the surface of the portion including the rear region, continuing the energization, and rotating the cathode drum and the take-up reel to pull the lead metal foil. Is peeled off to form a second lead metal foil connected to the lead metal foil, and further, the first metal film is formed by rotating the cathode drum and the take-up reel to pull the second lead metal foil. A portion of the lead metal film on the surface including the rear region is peeled off from the body surface, and then a second metal film connected to the first metal film and formed on the body surface is formed from the body surface. This is a method of continuously winding a metal foil formed by continuously peeling it onto the take-up reel.

本発明の金属箔製造用陰極ドラムおよび金属箔の製造方法を適用すれば、回転（自転）している陰極ドラムの胴体表面に析出した金属膜とリード材（リード金属膜）の後方領域を含む継ぎ目部分での破損や、金属箔の局所的な厚さの変動や析出不良、変色、色むらが抑制され、析出した金属膜を剥離して健全な金属箔を形成し、その金属箔を連続的に巻取ることができる。 If the metal foil manufacturing cathode drum and the metal foil manufacturing method of the present invention are applied, the metal film deposited on the body surface of the rotating (rotating) cathode drum and the rear region of the lead material (lead metal film) are included. Damage at the seams, local thickness fluctuations of the metal foil, poor precipitation, discoloration, and color unevenness are suppressed, and the precipitated metal film is peeled off to form a healthy metal foil, and the metal foil is continuous. Can be wound up.

従来技術を適用してリード材（リード金属箔）の後方領域を含む部分の表面上に金属膜を析出させた構成例を示す図である。It is a figure which shows the structural example which deposited the metal film on the surface of the part including the rear region of the reed material (reed metal foil) by applying the prior art. リード金属膜の後方端の観察例を模式的に示す図であって、本発明におけるリード金属膜の後方端の定義を説明するための図である。It is a figure which shows typically the observation example of the rear end of the lead metal film, and is the figure for demonstrating the definition of the rear end of a lead metal film in this invention. 本発明の金属箔製造用陰極ドラムの構成例を示す図である。It is a figure which shows the structural example of the cathode drum for metal leaf manufacturing of this invention. 本発明の金属箔製造用陰極ドラムを用いた金属箔の製造装置の要部構成例を示す図である。It is a figure which shows the example of the main part composition of the metal leaf manufacturing apparatus using the cathode drum for metal leaf manufacturing of this invention. 本発明を適用してリード材（リード金属膜）の後方領域を含む部分の表面上に金属膜を析出させた構成例を示す図である。It is a figure which shows the structural example which deposited the metal film on the surface of the part including the rear region of the reed material (reed metal film) by applying this invention. 図４に示す状態に続く金属箔の製造プロセスを示す図である。It is a figure which shows the manufacturing process of the metal foil following the state shown in FIG. 図６に示す状態に続く金属箔の製造プロセスを示す図である。It is a figure which shows the manufacturing process of the metal foil following the state shown in FIG. 図７に示す状態に続く金属箔の製造プロセスを示す図である。It is a figure which shows the manufacturing process of the metal foil following the state shown in FIG. 7. リード金属膜の平均厚さ５μｍの後方端の近傍を示す図（観察写真）である。It is a figure (observation photograph) which shows the vicinity of the rear end of the lead metal film with an average thickness of 5 μm. 図９に示すリード金属膜と陰極ドラムの胴体表面との境界部分を拡大して示す図（観察写真）である。FIG. 9 is an enlarged view (observation photograph) showing a boundary portion between the lead metal film shown in FIG. 9 and the body surface of the cathode drum. リード金属膜の平均厚さ２μｍの後方端の近傍を示す図（観察写真）である。It is a figure (observation photograph) which shows the vicinity of the rear end of the lead metal film with an average thickness of 2 μm. 図１１に示すリード金属膜と陰極ドラムの胴体表面との境界部分を拡大して示す図（観察写真）である。FIG. 11 is an enlarged view (observation photograph) showing a boundary portion between the lead metal film shown in FIG. 11 and the body surface of the cathode drum. リード金属膜（銅膜）と第２金属膜（アルミニウム膜）との継ぎ目部分を示す図（観察写真）である。It is a figure (observation photograph) which shows the joint part between a lead metal film (copper film) and a second metal film (aluminum film).

本発明の金属箔製造用陰極ドラム（以下、単に「陰極ドラム」という。）は、下記（Ａ）から下記（Ｄ）の特徴を有する。
（Ａ）胴体表面の有効電解域に形成された金属膜を剥離して金属箔を形成するために用いられる陰極ドラムである。
（Ｂ）前記胴体表面から結晶組織が繋がって前記胴体表面の有効電解域の一部を被うリード金属膜を有する。
（Ｃ）前記リード金属膜の前記陰極ドラムの回転方向の前方端部から結晶組織が繋がるとともに前記陰極ドラムから離れるリード金属箔を有する。
（Ｄ）前記リード金属膜の前記陰極ドラムの回転方向の後方領域には、前記後方領域に含まれる前記リード金属膜の後方端に向かって厚さが小さくなる厚さ傾斜部を備えている。 The cathode drum for metal leaf production of the present invention (hereinafter, simply referred to as “cathode drum”) has the following features (A) to (D).
(A) A cathode drum used for peeling a metal film formed in an effective electrolysis region on the surface of a body to form a metal foil.
(B) It has a lead metal film in which a crystal structure is connected from the body surface to cover a part of the effective electrolysis region on the body surface.
(C) The lead metal film has a lead metal foil that connects the crystal structure from the front end of the cathode drum in the rotational direction and separates from the cathode drum.
(D) The rear region of the lead metal film in the rotational direction of the cathode drum is provided with a thickness inclined portion whose thickness decreases toward the rear end of the lead metal film included in the rear region.

本発明の陰極ドラムの構成例を図３に示す。本発明の陰極ドラム１は、その胴体表面１ａから結晶組織が繋がって胴体表面１ａの有効電解域の一部を被うリード金属膜２を有する。かかる胴体表面１ａには、例えばチタンやチタン合金を用いることができる。かかるリード金属膜２は、例えば、電解析出（めっき）により胴体表面１ａから結晶組織が成長して形成されたものであり、その結晶組織は胴体表面１ａに対して十分に密着して繋がった状態になっている。なお、リード金属膜２は、リード材として機能する所定の厚さ（膜厚）が得られるとともに胴体表面１ａから剥離可能である場合は、スパッタリングや蒸着などの成膜方法を適用することができる。したがって、リード金属膜２の胴体表面１ａから結晶組織が繋がる部分には、胴体表面１ａとの間に電解液が浸入するような隙間が形成され難い。また、従来のように粘着テープで取り付けたものではないので、胴体表面１ａに粘着テープの粘着物が付着することがない。 A configuration example of the cathode drum of the present invention is shown in FIG. The cathode drum 1 of the present invention has a lead metal film 2 in which a crystal structure is connected from the body surface 1a and covers a part of the effective electrolytic region of the body surface 1a. For example, titanium or a titanium alloy can be used for the body surface 1a. The lead metal film 2 is formed by growing a crystal structure from the body surface 1a by, for example, electrolytic precipitation (plating), and the crystal structure is sufficiently adhered to and connected to the body surface 1a. It is in a state. When the lead metal film 2 has a predetermined thickness (thickness) that functions as a lead material and can be peeled off from the body surface 1a, a film forming method such as sputtering or vapor deposition can be applied. .. Therefore, in the portion of the lead metal film 2 where the crystal structure is connected from the body surface 1a, it is difficult to form a gap between the lead metal film 2 and the body surface 1a so that the electrolytic solution can penetrate. Further, since it is not attached with the adhesive tape as in the conventional case, the adhesive substance of the adhesive tape does not adhere to the body surface 1a.

こうした構成により、胴体表面１ａの粘着物（残渣）や胴体表面１ａとの隙間への電解液の滲入に起因すると考えられる金属箔の局所的な厚さ変動、変色、色むらを抑制することができる。なお、「胴体表面から結晶組織が繋がって前記胴体表面の有効電解域の一部を被うリード金属膜」における「胴体表面の有効電解域の一部」とは、作製する金属箔の全幅に対応する胴体表面１ａの有効電解域の幅方向の全領域と、リード金属膜２の後方領域における後方端２ｅから陰極ドラムの回転方向に向かい、リード金属箔が陰極ドラムから離れる剥離部４の間の有効電解域の周方向の領域をいう。また、一般的な電解析出法では、胴体表面１ａの有効電解域の幅方向の長さは、作製する金属箔の全幅と同等に設定される。 With such a configuration, it is possible to suppress local thickness fluctuation, discoloration, and color unevenness of the metal foil, which is considered to be caused by the infiltration of the electrolytic solution into the adhesive (residue) on the body surface 1a and the gap between the body surface 1a. can. In addition, "a part of the effective electrolysis area of the body surface" in "a lead metal film in which a crystal structure is connected from the body surface and covers a part of the effective electrolysis area of the body surface" means the entire width of the metal foil to be produced. Between the entire region in the width direction of the effective electrolysis region of the corresponding body surface 1a and the peeling portion 4 in which the lead metal foil separates from the cathode drum from the rear end 2e in the rear region of the lead metal film 2 in the direction of rotation of the cathode drum. Refers to the circumferential region of the effective electrolysis region of. Further, in the general electrolytic precipitation method, the length of the effective electrolytic region of the body surface 1a in the width direction is set to be equal to the total width of the metal foil to be produced.

また、陰極ドラム１に備わるリード金属膜２は、その表面上に電解析出法により作製する金属膜（金属箔）の金属成分が析出可能な材質であればよい。例えば、本発明を適用してアルミニウム箔を作製する場合は、リード金属膜には、非水性かつ嫌気性の電解液を用いた電解析出法による同質のアルミニウム膜を用いることもできるが、膜の形成が比較的容易な銅膜やニッケル膜を用いることが好ましい。銅膜やニッケル膜は、非水性かつ嫌気性ではない電解液を用いた電解析出法により、陰極ドラムの胴体表面に容易に形成することができる。また、銅膜やニッケル膜を胴体表面から隔離して形成された銅箔やニッケル箔は、適度な機械的強さと柔軟性を有するため取り扱いが容易である。また、銅膜は、電気伝導性に優れるため厚さ（膜厚）が均一に形成されやすいし、例えばアルミニウム箔とは色合いが異なるため明確に分別できる。こうした理由から、本発明を適用して例えば銅箔、ニッケル箔、鉄箔などの金属膜を作製する場合は、リード金属膜２として銅膜やニッケル膜を用いることが好ましい。なお、リード金属膜とその表面上に析出する金属膜との良好な密着性を得る観点では、銅膜を推奨する。 Further, the lead metal film 2 provided on the cathode drum 1 may be any material as long as the metal component of the metal film (metal foil) produced by the electrolytic precipitation method can be deposited on the surface thereof. For example, when an aluminum foil is produced by applying the present invention, a homogeneous aluminum film obtained by an electrolytic precipitation method using a non-aqueous and anaerobic electrolytic solution can be used as the lead metal film, but the film It is preferable to use a copper film or a nickel film, which is relatively easy to form. The copper film and nickel film can be easily formed on the body surface of the cathode drum by an electrolytic precipitation method using a non-aqueous and non-anaerobic electrolytic solution. Further, the copper foil or nickel foil formed by separating the copper film or nickel film from the body surface has appropriate mechanical strength and flexibility, and is easy to handle. Further, since the copper film has excellent electrical conductivity, it is easy to form a uniform thickness (film thickness), and for example, it can be clearly separated because it has a different color from that of aluminum foil. For this reason, when a metal film such as a copper foil, a nickel foil, or an iron foil is produced by applying the present invention, it is preferable to use a copper film or a nickel film as the lead metal film 2. A copper film is recommended from the viewpoint of obtaining good adhesion between the lead metal film and the metal film deposited on the surface thereof.

また、陰極ドラム１に備わるリード金属膜２は、陰極ドラム１の回転方向の前方端部に、その前方端部から結晶組織が繋がるリード金属箔３を有する。かかるリード金属箔３は、リード金属膜２から繋がるとともに陰極ドラム１から離れている。したがって、図４に示すように、リード金属膜２から繋がるリード金属箔３の前方端部であって、リード金属箔３の先端部分である前方端３ｅ（図３参照）を含む領域を巻取りリール９に巻き付けることができる。また、リード金属膜２に繋がっているリード金属箔３を陰極ドラム１および巻取りリール９の回転により巻取りながら引くことにより、胴体表面１ａに結晶組織が繋がるリード金属膜２を胴体表面１ａから剥離することができる。そして、そのリード金属箔３を引き続けることにより、リード金属膜２を胴体表面１ａから連続的に剥離して連続的にリード金属箔３を形成することができる。つまり、胴体表面１ａから剥離したリード金属膜２を、そのままリード金属箔３とすることができる。 Further, the lead metal film 2 provided on the cathode drum 1 has a lead metal foil 3 at a front end portion in the rotation direction of the cathode drum 1 to which a crystal structure is connected from the front end portion. The reed metal foil 3 is connected to the reed metal film 2 and separated from the cathode drum 1. Therefore, as shown in FIG. 4, the region including the front end 3e (see FIG. 3), which is the front end portion of the reed metal foil 3 connected from the lead metal film 2 and is the tip portion of the lead metal foil 3, is wound up. It can be wound around the reel 9. Further, by pulling the reed metal foil 3 connected to the lead metal film 2 while winding it by the rotation of the cathode drum 1 and the take-up reel 9, the reed metal film 2 in which the crystal structure is connected to the body surface 1a is pulled from the body surface 1a. Can be peeled off. Then, by continuing to pull the reed metal foil 3, the reed metal film 2 can be continuously peeled from the body surface 1a to continuously form the reed metal foil 3. That is, the reed metal film 2 peeled off from the body surface 1a can be used as it is as the reed metal foil 3.

リード金属膜の後方端は、リード金属膜の陰極ドラムの回転方向の後方側の末尾部分であって、リード金属膜を形成する金属（析出元素）の析出状態が比較的安定な部分（リード金属膜の実質的な末尾部分）およびそれから続く析出状態が比較的不安定な部分（リード金属膜の真の末尾部分）を含む、陰極ドラムの胴体表面との境界部分である。実際に形成されるリード金属膜の後方端を微視的に観察すると、例えば図２に示す模式図のように、陰極ドラムの回転方向の前方に向かう凹部と後方に向かう凸部とがリード金属膜の幅方向に沿って繰り返し現れるような波状の形態が確認され、単純な直線状の形態ではない場合が専らである。そこで、本発明では、図２に示すように、陰極ドラムの胴体表面にリード金属膜の幅方向（陰極ドラムの回転軸方向）中央を通る仮想直線Ｌａを設定し、その仮想直線Ｌａ上を矢印で示す陰極ドラムの回転方向の前方に向かって観察を進めた際に、リード金属膜を形成する金属の析出（リード金属膜が例えば銅膜の場合は銅の析出）が継続的に確認されるようになったとき、その金属の析出を最初に確認した位置（丸印Ｐａ）からさらに矢印で示す向きに３００μｍ進めた位置（丸印Ｐｂ）を通る仮想直線Ｌｂに対応するリード金属膜の幅方向の部位を「リード金属膜の後方端」と定義する。 The rear end of the lead metal film is the rearmost portion of the lead metal film on the rear side in the rotation direction of the cathode drum, and the portion where the metal (precipitated element) forming the lead metal film is relatively stable (lead metal). It is the interface to the fuselage surface of the cathode drum, including the (substantial tailing portion) of the membrane and the portion that follows it with relatively unstable precipitation (the true tailing portion of the lead metal film). When the rear end of the reed metal film actually formed is microscopically observed, for example, as shown in the schematic view shown in FIG. 2, the concave portion toward the front and the convex portion toward the rear in the rotation direction of the cathode drum are the reed metal. A wavy morphology that appears repeatedly along the width direction of the film has been confirmed, and it is mostly not a simple linear morphology. Therefore, in the present invention, as shown in FIG. 2, a virtual straight line La passing through the center in the width direction (rotation axis direction of the cathode drum) of the lead metal film is set on the body surface of the cathode drum, and an arrow is drawn on the virtual straight line La. When the observation is advanced toward the front in the rotation direction of the cathode drum shown in (1), precipitation of the metal forming the lead metal film (precipitation of copper when the lead metal film is, for example, a copper film) is continuously confirmed. When this happens, the width of the lead metal film corresponding to the virtual straight line Lb passing through the position (circle Pb) advanced by 300 μm in the direction indicated by the arrow from the position where the metal precipitation was first confirmed (circle Pa). The directional part is defined as the "rear edge of the lead metal film".

本発明における重要な特徴は、図３に示すように、後方領域２ａに含まれる厚さ傾斜部２ｓを備えていることである。ここで、本発明を適用してリード金属膜２の後方領域２ａを含む部分の表面上に金属膜を析出させた構成例を図５に示す。図５に示す構成例では、リード金属膜２の陰極ドラム１の回転方向の後方領域２ａにおいて、その後方領域２ａに含まれる後方端２ｅに向かって厚さが小さくなる厚さ傾斜部２ｓを備えている。なお、後方端２ｅは、上述したようにリード金属膜の実質的な末尾部分である。かかるリード金属膜２の後方領域２ａは、図６〜図８に示すように、剥離されてリード金属箔（第２リード金属箔３ａ）となるリード金属膜２の本体部分と、剥離されて金属箔１０となる金属膜（第２金属膜１０ｂ）とを繋ぐ重要な継ぎ目部分であるため、剥離および巻取りに耐える適切な機械的強さを有することが求められる。 An important feature in the present invention is that, as shown in FIG. 3, the thickness inclined portion 2s included in the rear region 2a is provided. Here, FIG. 5 shows a configuration example in which the metal film is deposited on the surface of the portion including the rear region 2a of the reed metal film 2 by applying the present invention. In the configuration example shown in FIG. 5, in the rear region 2a of the cathode drum 1 of the lead metal film 2 in the rotation direction, a thickness inclined portion 2s whose thickness decreases toward the rear end 2e included in the rear region 2a is provided. ing. The rear end 2e is a substantially trailing portion of the lead metal film as described above. As shown in FIGS. 6 to 8, the rear region 2a of the lead metal film 2 is peeled off from the main body portion of the lead metal film 2 to become the lead metal foil (second lead metal foil 3a), and the metal is peeled off. Since it is an important seam portion connecting the metal film (second metal film 10b) to be the foil 10, it is required to have appropriate mechanical strength to withstand peeling and winding.

また、リード金属膜２の後方領域２ａは、その表面上に第１金属膜１０ａが形成されて２層構造になった形態で剥離されるため、その２層構造になった形態で剥離に耐えることができる適切な機械的強さを有していればよい。したがって、第１金属膜１０ａとの２層構造になることによる機械的強さの増分を考慮すれば、リード金属膜２の後方領域２ａが後方端２ｅに向かって厚さが小さくなる形態であっても、剥離に耐えることができる適切な機械的強さを有することができる。よって、第１金属膜１０ａとの２層構造になるリード金属膜２の後方領域２ａには、その後方領域２ａに含まれる後方端２ｅに向かって厚さが小さくなる厚さ傾斜部２ｓを備えることができる。 Further, since the rear region 2a of the reed metal film 2 is peeled off in the form of a two-layer structure in which the first metal film 10a is formed on the surface thereof, the rear region 2a can withstand the peeling in the form of the two-layer structure. It suffices to have an appropriate mechanical strength capable of being capable. Therefore, considering the increase in mechanical strength due to the two-layer structure with the first metal film 10a, the thickness of the rear region 2a of the reed metal film 2 decreases toward the rear end 2e. However, it can have an appropriate mechanical strength that can withstand peeling. Therefore, the rear region 2a of the reed metal film 2 having a two-layer structure with the first metal film 10a is provided with a thickness inclined portion 2s whose thickness decreases toward the rear end 2e included in the rear region 2a. be able to.

かかる厚さ傾斜部２ｓにより、電解析出法によりリード金属膜２の表面上に第１金属膜１０ａを形成する際に電解集中が発生しやすいリード金属膜２の後方端２ｅを含む後方領域２ａの胴体表面１ａからの高さを、リード金属膜２の高さ（厚さ分）よりも低くすることができる。リード金属膜と胴体表面との境界部分は、高さ（厚さ分）が急激に低減するため絶壁面のような形態になりやすい。この場合、厚さ傾斜部２ｓを備えることにより、リード金属膜の実質的な末尾部分となる後方端２ｅの高さ（厚さ分）を最も低くすることができるので、リード金属膜と胴体表面との境界部分を絶壁面のような形態になり難くすることができる。また、リード金属膜２の後方領域２ａを含む部分の表面上に第１金属膜１０ａが形成された際に、２層構造になる第１金属膜１０ａおよび後方領域２ａを含む部分の厚さ（特に後方端２ｅにおける厚さ）と、１層構造となる第２金属膜１０ｂの部分の厚さとの差を、リード金属膜２の厚さが厚さ傾斜部２ｓにより薄肉化された分だけ小さくすることができる。 Due to the thickness inclined portion 2s, the rear region 2a including the rear end 2e of the reed metal film 2 where electrolytic concentration is likely to occur when the first metal film 10a is formed on the surface of the reed metal film 2 by the electrolytic precipitation method. The height from the body surface 1a of the lead metal film 2 can be made lower than the height (thickness) of the lead metal film 2. The height (thickness) of the boundary between the lead metal film and the surface of the fuselage is sharply reduced, so that the boundary portion tends to have a shape like a cliff. In this case, by providing the thickness inclined portion 2s, the height (thickness) of the rear end 2e, which is the substantial end portion of the lead metal film, can be made the lowest, so that the lead metal film and the fuselage surface can be made the lowest. It is possible to make it difficult for the boundary portion with and to be shaped like a cliff. Further, when the first metal film 10a is formed on the surface of the portion including the rear region 2a of the lead metal film 2, the thickness of the portion including the first metal film 10a and the rear region 2a having a two-layer structure ( In particular, the difference between the thickness at the rear end 2e) and the thickness of the portion of the second metal film 10b having a one-layer structure is reduced by the amount that the thickness of the lead metal film 2 is thinned by the thickness inclined portion 2s. can do.

こうした構成により、リード金属膜２と第１金属膜１０ａの継ぎ目部分における形態変化が小さく抑制される。特に電解集中が起こりやすいことに起因して成膜が不安定になることで機械的強さの低下が起こりやすいリード金属膜２の後方端２ｅにおける形態変化が小さく抑制されることにより、リード金属箔３を引いてリード金属膜２および第１金属膜１０ａを剥離する際に作用する応力に抗するだけの機械的強さを有することができる。
したがって、回転している陰極ドラム１の胴体表面１ａから剥離されたリード金属箔３と金属箔１０の継ぎ目部分での破損を抑制することができるため、リード金属箔３および金属箔１０を破損なく巻取りリール９に巻取ることができる。 With such a configuration, the morphological change at the joint portion between the lead metal film 2 and the first metal film 10a is suppressed to be small. In particular, the morphological change at the rear end 2e of the lead metal film 2 where the mechanical strength tends to decrease due to the unstable film formation due to the tendency for electrolytic concentration to occur is suppressed to a small extent, so that the lead metal It can have a mechanical strength sufficient to withstand the stress acting when the foil 3 is pulled to peel off the lead metal film 2 and the first metal film 10a.
Therefore, damage to the joint portion between the lead metal foil 3 and the metal leaf 10 peeled off from the body surface 1a of the rotating cathode drum 1 can be suppressed, so that the lead metal foil 3 and the metal foil 10 are not damaged. It can be wound on the take-up reel 9.

リード金属膜２の後方領域２ａを含む部分は、その厚さが小さくなるほど電解集中や引き剥がしによる応力集中が抑制されると考えられる。こうした観点から、リード金属膜２の後方端２ｅの平均厚さは、作製しようとする金属箔１０（第２金属膜１０ｂの剥離によって得られる金属箔）の平均厚さの７０％以下であることが好ましい。加えて、リード金属膜２の後方端２ｅの平均厚さは、３μｍ以上であるとともに２０μｍ以下であることが好ましい。なお、「リード金属膜２の後方端２ｅの平均厚さ」は、上述したようにリード金属膜２の後方端２ｅと定義した図２に示す仮想直線Ｌｂに対応するリード金属膜２の幅方向の部位において測定された複数箇所の厚さ値から求めた平均値とする。 It is considered that the smaller the thickness of the portion of the lead metal film 2 including the rear region 2a, the more the stress concentration due to electrolytic concentration and peeling is suppressed. From this point of view, the average thickness of the rear end 2e of the lead metal film 2 is 70% or less of the average thickness of the metal foil 10 (the metal foil obtained by peeling the second metal film 10b) to be produced. Is preferable. In addition, the average thickness of the rear end 2e of the lead metal film 2 is preferably 3 μm or more and 20 μm or less. The "average thickness of the rear end 2e of the lead metal film 2" is the width direction of the lead metal film 2 corresponding to the virtual straight line Lb shown in FIG. 2, which is defined as the rear end 2e of the lead metal film 2 as described above. It is the average value obtained from the thickness values of multiple points measured at the site of.

リード金属膜２の後方端２ｅの平均厚さが金属箔１０（第２金属膜１０ｂの剥離によって得られる金属箔）の平均厚さの７０％を超えるようになると、第２金属膜１０ｂの厚さに対する胴体表面１ａからの高さ（厚さ分）が大きくなるため、リード金属膜２の後方端２ｅ付近で電解集中や応力集中が発生しやすくなる。例えば、金属箔１０の平均厚さが２８．６μｍであるとともにリード金属膜２の後方端２ｅの平均厚さが金属箔１０の平均厚さの７０％値である場合は後方端２ｅの平均厚さが２０．０μｍとなり、金属箔１０の平均厚さの７０％値を超えると後方端２ｅの平均厚さが２０μｍを超える。この場合、リード金属膜２の後方端２ｅの胴体表面１ａからの高さ（厚さ分）が３μｍ以上２０μｍ以下の範囲を超えて大きくなるため、電解集中や応力集中が発生しやすくなると考えられる。 When the average thickness of the rear end 2e of the lead metal film 2 exceeds 70% of the average thickness of the metal foil 10 (the metal foil obtained by peeling the second metal film 10b), the thickness of the second metal film 10b Since the height (thickness) from the body surface 1a is increased with respect to the thickness, electrolytic concentration and stress concentration are likely to occur near the rear end 2e of the lead metal film 2. For example, when the average thickness of the metal foil 10 is 28.6 μm and the average thickness of the rear end 2e of the lead metal film 2 is 70% of the average thickness of the metal foil 10, the average thickness of the rear end 2e When the value is 20.0 μm and exceeds 70% of the average thickness of the metal foil 10, the average thickness of the rear end 2e exceeds 20 μm. In this case, since the height (thickness) of the rear end 2e of the lead metal film 2 from the fuselage surface 1a becomes larger than the range of 3 μm or more and 20 μm or less, it is considered that electrolytic concentration and stress concentration are likely to occur. ..

リード金属膜２の後方端２ｅが例えば３μｍ未満の平均厚さであると、電解条件やその制御変動が析出組織の形成に影響し、胴体表面１ａから繋がる結晶組織に粒状の析出組織が含まれやすくなるため、剥離に耐える適切な機械的強さが得られないことがある。また、リード金属膜２の後方端２ｅを含む厚さ傾斜部２ｓに膜状の組織化が不完全な粒状の析出組織が形成されていると、リード金属箔２が剥離される際に胴体表面１ａに多くの粒状の析出金属が残存する虞があるため、リード金属膜２の厚さ傾斜部２ｓの特に後方端２ｅは粒状の析出組織が形成され難い程度の厚さであることが好ましい。こうした観点からも、リード金属膜２の後方端２ｅの平均厚さは、３μｍ以上が好ましく、５μｍ以上がより好ましい。リード金属膜２を剥離した後の胴体表面１ａに粒状の析出組織が残存していたからといって、それが過剰でない限り、リード金属膜２が剥離された後の胴体表面１ａに析出する金属膜およびその金属膜を剥離して形成する金属箔に必ず不具合が発生するものでもない。
When the rear end 2e of the lead metal film 2 has an average thickness of less than, for example, 3 μm, the electrolytic conditions and their control fluctuations affect the formation of the precipitated structure, and the crystal structure connected from the body surface 1a contains a granular precipitated structure. As it becomes easier, it may not be possible to obtain appropriate mechanical strength to withstand peeling. Further, if a granular precipitated structure in which the film-like organization is incomplete is formed on the thickness inclined portion 2s including the rear end 2e of the lead metal film 2, the body surface when the lead metal foil 2 is peeled off. Since there is a possibility that a large amount of granular precipitated metal remains in 1a, it is preferable that the thickness inclined portion 2s of the lead metal film 2, particularly the rear end 2e, has a thickness that makes it difficult for a granular precipitated structure to be formed. From this point of view, the average thickness of the rear end 2e of the lead metal film 2 is preferably 3 μm or more, and more preferably 5 μm or more. Even if the granular precipitated structure remains on the body surface 1a after the lead metal film 2 is peeled off, the metal film deposited on the body surface 1a after the lead metal film 2 is peeled off and unless it is excessive. The metal foil formed by peeling off the metal film does not always have a problem.

一般的な電解析出法により作製可能な金属箔（リード材に用いる金属箔を含む）の厚さは、その金属成分や電解液組成や電解条件などの影響を受けるが、少なくとも膜状の析出組織を有する金属膜が形成される厚さ以上（銅箔の場合の厚さの下限は３μｍ乃至５μｍと考えられる）、好ましくは膜状の析出組織を有する金属膜が安定的に形成される厚さ以上であれば、その金属膜は引き剥がしに耐えるだけの機械的強さを有し、その金属箔は巻取りに耐えるだけの機械的強さを有すると考えられる。こうした観点から、リード金属膜２の平均厚さは１０μｍ以上が好ましいと考えられる。なお、「リード金属膜の平均厚さ」とは、リード金属膜２の厚さ傾斜部２ｓよりも陰極ドラムの回転方向の前方領域であって、陰極ドラムの回転軸方向に沿った方向（幅方向）において測定されたリード金属膜２の本体部分の複数箇所の厚さ値から求めた平均値とする。 The thickness of the metal foil (including the metal foil used for the lead material) that can be produced by a general electrolytic precipitation method is affected by the metal component, electrolyte composition, electrolytic conditions, etc., but at least film-like precipitation A thickness equal to or greater than the thickness at which a metal film having a structure is formed (the lower limit of the thickness in the case of copper foil is considered to be 3 μm to 5 μm), preferably a thickness at which a metal film having a film-like precipitated structure is stably formed. If it is more than that, it is considered that the metal film has a mechanical strength enough to withstand peeling, and the metal foil has a mechanical strength enough to withstand winding. From this point of view, it is considered that the average thickness of the lead metal film 2 is preferably 10 μm or more. The "average thickness of the lead metal film" is a region in front of the thickness inclined portion 2s of the lead metal film 2 in the rotation direction of the cathode drum, and is a direction (width) along the rotation axis direction of the cathode drum. The average value obtained from the thickness values of the main body portion of the lead metal film 2 measured in the direction).

リード金属膜２は、１層構造となるリード金属膜２の単独部分およびその表面上に第１金属膜１０ａが形成されて２層構造となる積層部分の引き剥がしに耐えることができる適切な機械的強さを有することが求められる。加えて、リード金属膜２の積層部分の後方領域２ａ（図５参照）すなわち厚さ傾斜部２ｓおよび後方端２ｅを含む継ぎ目部分の引き剥がし、および２層構造の継ぎ目部分の第１金属膜１０ａから繋がる第２金属膜１０ｂの引き剥がしを、安定に行うことができることが求められる。さらに、リード金属膜２の剥離によって形成されるリード金属箔３（図３参照）は、巻取りリール９への巻取りに耐えることができる適切な機械的強さを有することが求められる。そのため、リード金属膜２は、より厚くして破損を十分に抑制することが好ましいが、破損が発生しない程度により薄くして生産コストを低減することもできる。こうした観点から、リード金属膜２の平均厚さは、作製する金属箔の厚さとの関係を考慮した上で、剥離や巻取りの際の破損が抑制できると考えられる、例えば、１０μｍ以上５０μｍ以下であることが好ましい。なお、リード金属膜２の厚さは、作製可能である限り上限はないが、生産コストやハンドリングなどの生産性の観点から５０μｍを超えて平均厚さを大きくすることは無駄である。 The reed metal film 2 is an appropriate machine capable of withstanding peeling off of a single portion of the reed metal film 2 having a one-layer structure and a laminated portion having a two-layer structure in which the first metal film 10a is formed on the surface thereof. It is required to have the strength. In addition, the rear region 2a (see FIG. 5) of the laminated portion of the lead metal film 2, that is, the seam portion including the thickness inclined portion 2s and the rear end 2e is peeled off, and the first metal film 10a of the seam portion of the two-layer structure is peeled off. It is required that the second metal film 10b connected to the metal film 10b can be peeled off stably. Further, the reed metal foil 3 (see FIG. 3) formed by peeling the reed metal film 2 is required to have an appropriate mechanical strength capable of withstanding winding on the take-up reel 9. Therefore, it is preferable that the lead metal film 2 is made thicker to sufficiently suppress breakage, but it is also possible to reduce the production cost by making the lead metal film 2 thinner to the extent that breakage does not occur. From this point of view, it is considered that the average thickness of the lead metal film 2 can suppress breakage during peeling and winding, taking into consideration the relationship with the thickness of the metal foil to be produced, for example, 10 μm or more and 50 μm or less. Is preferable. The thickness of the lead metal film 2 has no upper limit as long as it can be manufactured, but it is useless to increase the average thickness beyond 50 μm from the viewpoint of productivity such as production cost and handling.

例えば、作製する金属箔１０の平均厚さをＴｆとし、胴体表面１ａから結晶組織が繋がるリード金属膜２の本体部分（厚さ傾斜部２ｓよりも陰極ドラムの回転方向の前方側の部分）の平均厚さをＴＬｃとするとき、上述したようにリード金属膜２の平均厚さの好ましい範囲は１０μｍ以上５０μｍ以下であるが、Ｔｆ＋ＴＬｃを例えば４０μｍ〜５０μｍの範囲に設定することもできる。具体的には、Ｔｆを例えば８μｍとする場合はＴＬｃを３２μｍ〜４２μｍの範囲で設定することができるし、Ｔｆを例えば１２μｍとする場合はＴＬｃを２８μｍ〜３８μｍの範囲で設定することができるし、Ｔｆを例えば２０μｍとする場合はＴＬｃを２０μｍ〜３０μｍの範囲で設定することができる。なお、Ｔｆ＋ＴＬｃが４０μｍ〜５０μｍを満足する場合であっても、平均厚さＴＬｃの本体部分から繋がるリード金属膜２の後方領域２ａの厚さ傾斜部２ｓは、その平均厚さが３μｍ以上（好ましくは５μｍ以上）２０μｍ以下であるとともに、金属箔１０の平均厚さＴｆの７０％以下であることが好ましい。 For example, let Tf be the average thickness of the metal foil 10 to be produced, and the main body portion of the reed metal film 2 (the portion on the front side in the rotation direction of the cathode drum from the thickness inclined portion 2s) where the crystal structure is connected from the body surface 1a. When the average thickness is TLc, the preferable range of the average thickness of the lead metal film 2 is 10 μm or more and 50 μm or less as described above, but Tf + TLc can be set in the range of 40 μm to 50 μm, for example. Specifically, when Tf is set to, for example, 8 μm, TLc can be set in the range of 32 μm to 42 μm, and when Tf is set to, for example, 12 μm, TLc can be set in the range of 28 μm to 38 μm. When Tf is set to, for example, 20 μm, TLc can be set in the range of 20 μm to 30 μm. Even when Tf + TLc satisfies 40 μm to 50 μm, the average thickness of the thickness inclined portion 2s of the rear region 2a of the lead metal film 2 connected from the main body portion of the average thickness TLc is 3 μm or more (preferably). Is 5 μm or more) 20 μm or less, and is preferably 70% or less of the average thickness Tf of the metal foil 10.

平均厚さがＴＬｃのリード金属膜２から繋がるリード金属箔３は、リード金属膜２と同等以上の厚さにしておくと、陰極ドラム１の胴体表面１ａに析出させたリード金属膜２を剥離するだけでリード金属箔３を容易に作製することができる（図４参照）とともに、巻取りリール９への巻取りに耐えることができる適切な機械的強さを有することができる。また、リード金属箔３の前方端部３ｅを含む部分は、巻取りリール９に最初に巻掛けられて比較的大きな曲げ力が作用するため、リード金属箔３の本体部分（前方端部３ｅよりも陰極ドラムの回転方向の後方側の部分）よりも厚くすることにより、かかる大きな曲げ力に耐える機械的強さを有することができる。 When the lead metal foil 3 connected from the lead metal film 2 having an average thickness of TLc has a thickness equal to or greater than that of the lead metal film 2, the lead metal film 2 deposited on the body surface 1a of the cathode drum 1 is peeled off. The lead metal foil 3 can be easily manufactured (see FIG. 4) and has an appropriate mechanical strength capable of withstanding winding on the take-up reel 9. Further, since the portion of the lead metal foil 3 including the front end portion 3e is first wound around the take-up reel 9 and a relatively large bending force acts on it, the main body portion of the lead metal foil 3 (from the front end portion 3e). By making it thicker than the portion on the rear side in the rotation direction of the cathode drum), it is possible to have mechanical strength to withstand such a large bending force.

本発明の金属箔の製造方法は、上述した方法で準備した陰極ドラム１を用いて、例えばアルミニウム箔などの金属箔（電解金属箔）を連続的に製造できる方法であり、下記（１）から下記（５）のセットアップおよびプロセスを含む。なお、符号は、図２〜図８を参照する。 The method for producing a metal foil of the present invention is a method capable of continuously producing a metal foil (electrolytic metal foil) such as an aluminum foil by using the cathode drum 1 prepared by the above method, from the following (1). The setup and process of (5) below are included. For the reference numerals, refer to FIGS. 2 to 8.

（１）セットアップ
陰極ドラム１を用いて、リード金属膜２を有する胴体表面１ａの一部を陽極部材５が浸漬された電解液８中に浸漬し、かつ、リード金属箔３の巻取り方向の前方端部３ｅを巻取りリール９に固定する。なお、リード金属箔３の前方端部３ｅに別のリード材を接合し、そのリード材を巻取リール９に固定するようにしてもよい。
（２）第１金属膜１０ａの形成プロセス
胴体表面１ａと陽極部材５の間の通電により、電解液８に浸漬されたリード金属膜２の後方領域２ａを含む部分の表面上に第１金属膜１０ａを形成する。
（３）第２リード金属箔３ａの形成プロセス
通電を継続するとともに、陰極ドラム１および巻取りリール９を回転してリード金属箔３を引くことにより、リード金属膜２を剥離してリード金属箔３から繋がる第２リード金属箔３ａを形成する。
（４）継ぎ目部分の剥離プロセス
さらに、陰極ドラム１および巻取りリール９を回転して第２リード金属箔３ａを引くことにより、第１金属膜１０ａを表面上に有するリード金属膜２の後方領域２ａを含む部分を胴体表面１ａから剥離する。
（５）金属膜１０の形成プロセス
続いて、第１金属膜１０ａから繋がって胴体表面１ａに形成された第２金属膜１０ｂを胴体表面１ａから連続的に剥離して形成した金属箔１０を巻取りリール９に連続的に巻取る。 (1) Setup Using the cathode drum 1, a part of the body surface 1a having the lead metal film 2 is immersed in the electrolytic solution 8 in which the anode member 5 is immersed, and the lead metal foil 3 is wound in the winding direction. The front end portion 3e is fixed to the take-up reel 9. Another lead material may be joined to the front end portion 3e of the lead metal foil 3 and the lead material may be fixed to the take-up reel 9.
(2) Formation process of the first metal film 10a The first metal film is formed on the surface of the portion including the rear region 2a of the lead metal film 2 immersed in the electrolytic solution 8 by energization between the body surface 1a and the anode member 5. Form 10a.
(3) Forming Process of Second Lead Metal Leaf 3a The lead metal film 2 is peeled off by rotating the cathode drum 1 and the take-up reel 9 to pull the lead metal foil 3 while continuing the energization, and the lead metal foil. The second lead metal foil 3a connected from 3 is formed.
(4) Peeling process of the seam portion Further, by rotating the cathode drum 1 and the take-up reel 9 and pulling the second lead metal foil 3a, the rear region of the lead metal film 2 having the first metal film 10a on the surface. The portion including 2a is peeled off from the body surface 1a.
(5) Forming Process of Metal Film 10 Subsequently, a metal foil 10 formed by continuously peeling the second metal film 10b formed on the body surface 1a connected from the first metal film 10a from the body surface 1a is wound. It is continuously wound on the take reel 9.

なお、上述したセットアップにおいて、リード金属膜２の後方領域２ａの厚さ傾斜部２ｓを含む部分は、リード金属膜２を有する胴体表面１ａの一部を電解液８中に浸漬した際に、電解液８に浸漬させないことが好ましい。リード金属膜２の後方領域２ａの厚さ傾斜部２ｓを含む部分が、セットアップにおいて電解液８に浸漬していない場合は、その後の通電開始の状態で陰極ドラム１を回転して初めて電解液８中に浸漬されるため、かかる後方領域２ａの厚さ傾斜部２ｓを含む部分の電解液８中での滞在時間（浸漬時間）を長くすることができる。そのため、かかる後方領域２ａの厚さ傾斜部２ｓを含む部分の表面上に析出する第１金属膜１ａを、十分に成長させることができるし、かかる浸漬時間の制御により継ぎ目部分の機械的強さを適切に制御することができる。 In the above-mentioned setup, the portion of the rear region 2a of the reed metal film 2 including the thickness inclined portion 2s is electrolyzed when a part of the body surface 1a having the reed metal film 2 is immersed in the electrolytic solution 8. It is preferable not to immerse it in the liquid 8. If the portion of the rear region 2a of the lead metal film 2 including the thickness inclined portion 2s is not immersed in the electrolytic solution 8 in the setup, the electrolytic solution 8 must be rotated in the state where the energization is started thereafter. Since it is immersed in the electrolytic solution 8, the residence time (immersion time) of the portion including the thickness inclined portion 2s of the rear region 2a can be lengthened. Therefore, the first metal film 1a deposited on the surface of the portion including the thickness inclined portion 2s of the rear region 2a can be sufficiently grown, and the mechanical strength of the seam portion is controlled by controlling the immersion time. Can be controlled appropriately.

本発明の金属箔製造用陰極ドラムを用いた本発明の金属箔の製造方法を適用し、アルミニウム箔を作製する実施例について詳細に説明する。また、説明の便宜上、図２〜図８に示す符号を準用する。なお、本発明は、作製する金属箔およびその作製に用いるリード金属膜などを含め、以下の記載に限定して解釈されるものではない。 An example of producing an aluminum foil by applying the method for producing a metal leaf of the present invention using the cathode drum for producing a metal leaf of the present invention will be described in detail. Further, for convenience of explanation, the reference numerals shown in FIGS. 2 to 8 are applied mutatis mutandis. The present invention is not construed as being limited to the following description, including the metal foil to be produced and the reed metal film used for the production thereof.

陰極ドラム１は、直径が１４０ｍｍ、胴長が３００ｍｍ、有効電解域の幅（胴長方向の長さ）が２００ｍｍのチタン製の胴体表面１ａを備えるものを準備した。その陰極ドラム１に備えるリード金属膜２およびリード金属箔３は、非水性かつ嫌気性ではない電解液（めっき液）を用いた電解析出法により容易に形成することができる銅膜および銅箔とした。そして、胴体表面１ａから結晶組織が繋がって胴体表面１ａの有効電解域の一部を被う銅膜（リード金属膜２）と、その銅膜の陰極ドラム１の回転方向の前方端部から結晶組織が繋がって陰極ドラム１から離れる銅箔（リード金属箔３）と、を有し、銅膜の陰極ドラム１の回転方向の後方領域２ａには、銅膜の後方端２ｅに向かって厚さが小さくなる厚さ傾斜部２ｓを備える、陰極ドラム１を準備した。そして、その陰極ドラム１を用いて、銅膜を有する胴体表面１ａの一部をアルミニウム製の陽極部材５が浸漬された電解液８中に浸漬し、銅箔の巻取り方向の前方端部３ｅを巻取りリール９に固定した。以下、詳述する。 A cathode drum 1 having a titanium body surface 1a having a diameter of 140 mm, a body length of 300 mm, and a width of an effective electrolysis region (length in the body length direction) of 200 mm was prepared. The reed metal film 2 and the reed metal foil 3 provided on the cathode drum 1 can be easily formed by an electrolytic precipitation method using a non-aqueous and non-anaerobic electrolytic solution (plating solution). And said. Then, crystals are formed from a copper film (lead metal film 2) in which a crystal structure is connected from the body surface 1a and covers a part of the effective electrolytic region of the body surface 1a, and a front end portion of the copper film in the rotation direction of the cathode drum 1. It has a copper foil (lead metal foil 3) to which the tissues are connected and separated from the cathode drum 1, and the rear region 2a of the copper film in the rotational direction of the cathode drum 1 has a thickness toward the rear end 2e of the copper film. A cathode drum 1 provided with a thickness inclined portion 2s having a small thickness was prepared. Then, using the cathode drum 1, a part of the body surface 1a having a copper film is immersed in the electrolytic solution 8 in which the aluminum anode member 5 is immersed, and the front end portion 3e in the winding direction of the copper foil is immersed. Was fixed to the take-up reel 9. The details will be described below.

銅膜は、ピロリン酸銅めっき液を入れた電解浴槽内に胴体表面１ａを浸漬し、その浸漬した胴体表面１ａに対向させて銅製の陽極部材を配置し、電解析出処理（銅めっき処理）を行った。かかる銅めっき処理では、約５０℃に液温制御したピロリン酸銅めっき液が循環する中で胴体表面１ａと陽極部材の間で通電し、電流密度を約５０ｍＡ／ｃｍ^２に制御して胴体表面１ａに銅を析出させた。かかる銅めっき処理を行いながら陰極ドラム１を約１８０度回転し、胴体表面１ａ（外周面）の約半周分の有効電解域を被うように銅を析出させることにより、平均厚さが２０μｍ、幅（胴長方向の長さ）が２００ｍｍの銅膜（リード金属膜２）を形成した。 For the copper film, the body surface 1a is immersed in an electrolytic bath containing a copper pyrophosphate plating solution, and a copper anode member is arranged so as to face the immersed body surface 1a, and electrolytic precipitation treatment (copper plating treatment) is performed. Was done. In such a copper plating process, while the copper pyrophosphate plating solution whose liquid temperature is controlled to about 50 ° C. circulates, electricity is applied between the body surface 1a and the anode member, and the current density is ^{controlled to about 50 mA / cm 2} to control the body surface. Copper was deposited on 1a. While performing such copper plating treatment, the cathode drum 1 is rotated about 180 degrees to deposit copper so as to cover the effective electrolytic region of about half of the body surface 1a (outer peripheral surface), so that the average thickness is 20 μm. A copper film (lead metal film 2) having a width (length in the body length direction) of 200 mm was formed.

ここで、通電および陰極ドラム１の回転を一時停止し、液面から露出している胴体表面１ａに析出している銅膜（リード金属膜２）の前方端をピンセットと粘着テープを用いて剥離することにより、銅箔の前方端部３ｅを形成した。その銅箔の前方端部３ｅを保持した状態で、通電および陰極ドラム１の回転を再開し、胴体表面１ａに析出している銅膜の後方領域２ａに隣接する胴体表面１ａに銅を析出させるとともに、前方端部で銅箔に繋がる銅膜を胴体表面１ａから連続的に剥離して巻取りリール９に巻掛け可能な長さの銅箔（リード金属箔３）が形成できたところで通電および陰極ドラム１の回転を停止した。その後、銅箔を引いて巻取りリール９に巻掛け、銅箔の前方端部３ｅを含む部分を粘着テープで固定した。 Here, energization and rotation of the cathode drum 1 are temporarily stopped, and the front end of the copper film (lead metal film 2) deposited on the body surface 1a exposed from the liquid surface is peeled off using tweezers and an adhesive tape. By doing so, the front end portion 3e of the copper foil was formed. While holding the front end 3e of the copper foil, energization and rotation of the cathode drum 1 are restarted to deposit copper on the body surface 1a adjacent to the rear region 2a of the copper film deposited on the body surface 1a. At the same time, the copper film connected to the copper foil at the front end is continuously peeled off from the body surface 1a to form a copper foil (lead metal foil 3) having a length that can be wound around the take-up reel 9. The rotation of the cathode drum 1 was stopped. Then, the copper foil was pulled and wound around the take-up reel 9, and the portion including the front end portion 3e of the copper foil was fixed with an adhesive tape.

続いて、通電の再開とともに陰極ドラム１および巻取りリール９の同期回転を開始し、胴体表面１ａに析出している銅膜の後方領域２ａに隣接する胴体表面１ａに銅を析出させるとともに、前方端部で銅箔３に繋がる銅膜を胴体表面１ａから連続的に剥離することにより形成された銅箔を巻取りリール９に連続的に巻取り、ハンドリングしやすい十分な長さの銅箔を形成した。ここで、通電と陰極ドラム１および巻取りリール９の同期回転を停止し、胴体表面１ａに結晶組織が繋がった銅膜を有し、その銅膜から結晶組織が繋がるとともに陰極ドラム１から離れた銅箔を有する陰極ドラム１を、電解浴槽から取り出し、また、巻取りリール９に巻取った銅箔を取り外した。そして、銅箔が繋がり胴体表面１ａに銅膜を有する陰極ドラム１に残るめっき液や付着物を洗浄処理により除去し、さらに十分な乾燥処理を行なった。 Subsequently, when the energization is resumed, the cathode drum 1 and the take-up reel 9 are started to rotate synchronously to deposit copper on the body surface 1a adjacent to the rear region 2a of the copper film deposited on the body surface 1a, and to deposit copper on the front. The copper foil formed by continuously peeling the copper film connected to the copper foil 3 at the end from the body surface 1a is continuously wound around the take-up reel 9, and a copper foil of sufficient length that is easy to handle is obtained. Formed. Here, the energization and the synchronous rotation of the cathode drum 1 and the take-up reel 9 are stopped, and the body surface 1a has a copper film in which the crystal structure is connected, and the crystal structure is connected from the copper film and separated from the cathode drum 1. The cathode drum 1 having the copper foil was taken out from the electrolytic bath, and the copper foil wound on the take-up reel 9 was removed. Then, the plating solution and deposits remaining on the cathode drum 1 to which the copper foils were connected and had a copper film on the body surface 1a were removed by a cleaning treatment, and further sufficient drying treatment was performed.

上述した陰極ドラム１の回転を伴う銅めっき処理と、その後の洗浄処理および乾燥処理を経て、胴体表面１ａから結晶組織が繋がって胴体表面１ａの有効電解域の一部を被う銅膜（リード金属膜２）と、その銅膜の陰極ドラム１の回転方向の前方端部から結晶組織が繋がる銅箔（リード金属箔３）と、を有し、その銅膜の陰極ドラム１回転方向の後方領域２ａには、銅膜（リード金属膜２）の後方端２ｅに向かって厚さが小さくなる厚さ傾斜部２ｓを備える陰極ドラム１を形成することができた。 After the copper plating treatment accompanied by the rotation of the cathode drum 1 described above, followed by a cleaning treatment and a drying treatment, a copper film (lead) in which the crystal structure is connected from the body surface 1a and covers a part of the effective electrolytic region of the body surface 1a. It has a metal film 2) and a copper foil (lead metal foil 3) to which a crystal structure is connected from the front end of the copper film in the direction of rotation of the cathode drum 1, and is behind the copper film in the direction of rotation of the cathode drum 1. In the region 2a, a cathode drum 1 having a thickness inclined portion 2s whose thickness decreases toward the rear end 2e of the copper film (lead metal film 2) could be formed.

厚さ傾斜部２ｓを銅膜の後方領域２ａの部分に形成するに際しては、電解液８への浸漬時間の長短の変化により析出膜の厚さが変化することを利用し、胴体表面１ａの厚さ傾斜部２ｓを形成する部分の電解液８中の浸漬時間を制御する方法で行った。具体的には、通電した状態で陰極ドラム１の回転を一時停止し、電解液８中に浸漬している部分（表面）の析出膜（銅膜）の成長を促進させた後に陰極ドラム１の回転を再開し、銅膜の後方領域２ａを含む部分の厚さ傾斜部２ｓを形成する部分（胴体表面１ａ）の電解液８中の滞在時間（浸漬時間）が徐々に短くなるようにした。この方法により、銅膜の後方領域２ａにおいて、厚さ傾斜部２ｓを形成する部分の析出膜（銅膜）の厚さを後方端２ｅに向かって徐々に小さく形成した。これにより、本体となる銅膜および銅箔の平均厚さが２０μｍで、後方端２ｅの平均厚さが５μｍのリード金属膜２（本発明例１）を形成した。また、同様な方法により、同じ陰極ドラム１を繰り返し使用し、本体となる銅膜および銅箔の平均厚さが２０μｍで、後方端２ｅの平均厚さが２μｍのリード金属膜２（本発明例２）を形成した。加えて、銅膜の後方端２ｅの平均厚さを２μｍ〜１０μｍの範囲から選択して違えた幾つかのパターンの陰極ドラム１（いずれも本発明例）を準備した。 When the thickness inclined portion 2s is formed in the rear region 2a of the copper film, the thickness of the body surface 1a is thickened by utilizing the fact that the thickness of the precipitation film changes depending on the length of the immersion time in the electrolytic solution 8. The method was performed by controlling the immersion time in the electrolytic solution 8 of the portion forming the inclined portion 2s. Specifically, the rotation of the cathode drum 1 is temporarily stopped in the energized state to promote the growth of the precipitation film (copper film) of the portion (surface) immersed in the electrolytic solution 8, and then the cathode drum 1 is subjected to. The rotation was restarted so that the residence time (immersion time) in the electrolytic solution 8 of the portion (body surface 1a) forming the thickness inclined portion 2s of the portion including the rear region 2a of the copper film was gradually shortened. By this method, in the rear region 2a of the copper film, the thickness of the precipitation film (copper film) of the portion forming the thickness inclined portion 2s was gradually reduced toward the rear end 2e. As a result, a reed metal film 2 (Example 1 of the present invention) having an average thickness of 20 μm of the copper film and the copper foil as the main body and an average thickness of 5 μm at the rear end 2e was formed. Further, by the same method, the same cathode drum 1 is repeatedly used, and the lead metal film 2 having an average thickness of a copper film and a copper foil as a main body of 20 μm and an average thickness of the rear end 2e of 2 μm (example of the present invention). 2) was formed. In addition, several patterns of cathode drums 1 (all of which are examples of the present invention) in which the average thickness of the rear end 2e of the copper film was selected from the range of 2 μm to 10 μm were prepared.

ここで、本発明例１として、リード金属膜２の平均厚さ５μｍの後方端２ｅの近傍を示す観察写真（倍率１００）を図９に示し、図９に示すリード金属膜２と陰極ドラム１の胴体表面１ａとの境界部分の拡大観察写真（倍率１５０００）を図１０に示す。また、本発明例２として、リード金属膜２の平均厚さ２μｍの後方端２ｅの近傍を示す観察写真（倍率１００）を図１１に示し、図１１に示すリード金属膜２と陰極ドラム１の胴体表面１ａとの境界部分の拡大観察写真（倍率１５０００）を図１２に示す。図９〜図１２に示す観察写真は、走査電子顕微鏡（ＳＥＭ：ＳｃａｎｎｉｎｇＥｌｅｃｔｒｏｎＭｉｃｒｏｓｃｏｐｅ）による表面像である。本発明例１のリード金属膜２は、境界部分において膜状の析出組織が確認され、後方端２ｅの平均厚さが５μｍであると、銅が比較的密に析出することが分かった。本発明例２のリード金属膜２は、境界部分において部分的に粒状の析出組織が確認され、後方端２ｅの平均厚さが２μｍであると、銅が比較的粗に析出することが分かった。本発明例１と本発明例２の比較では、粒状の析出組織よりも好ましい膜状の析出組織が形成された平均厚さ５μｍの後方端２ｅを有する本発明例１が好ましいと考えられる。 Here, as Example 1 of the present invention, an observation photograph (magnification 100) showing the vicinity of the rear end 2e having an average thickness of 5 μm of the lead metal film 2 is shown in FIG. 9, and the lead metal film 2 and the cathode drum 1 shown in FIG. 9 are shown. FIG. 10 shows a magnified observation photograph (magnification of 15000) of the boundary portion with the body surface 1a. Further, as Example 2 of the present invention, an observation photograph (magnification 100) showing the vicinity of the rear end 2e having an average thickness of 2 μm of the lead metal film 2 is shown in FIG. 11, and the lead metal film 2 and the cathode drum 1 shown in FIG. 11 are shown. FIG. 12 shows a magnified observation photograph (magnification 15000) of the boundary portion with the body surface 1a. The observation photographs shown in FIGS. 9 to 12 are surface images taken by a scanning electron microscope (SEM). In the lead metal film 2 of Example 1 of the present invention, a film-like precipitation structure was confirmed at the boundary portion, and it was found that copper was relatively densely deposited when the average thickness of the rear end 2e was 5 μm. In the reed metal film 2 of Example 2 of the present invention, a partially granular precipitated structure was confirmed at the boundary portion, and it was found that copper was relatively coarsely precipitated when the average thickness of the rear end 2e was 2 μm. .. In the comparison between Example 1 of the present invention and Example 2 of the present invention, it is considered that Example 1 of the present invention having a rear end 2e having an average thickness of 5 μm in which a film-like precipitated structure is formed is preferable to the granular precipitated structure.

上述した方法により準備した本発明例の陰極ドラム１を、電解析出法によりアルミニウムの析出が可能な電解液８を入れた電解浴槽６内に設置した。そして、アルミニウム製の陽極部材５を浸漬した電解液８中に、リード金属膜２を有する胴体表面１ａの一部を浸漬するとともに、その陰極ドラム１がアルミニウム製の陽極部材５と対向するように配置した。この際、リード金属膜２の胴体表面１ａから結晶組織が繋がる後方領域２ａを含む部分は、図４に示すように電解液８に触れない液面よりも上側に配置した。続いて、陰極ドラム１の胴体表面１ａから繋がったリード金属箔３の巻取り方向の前方端部３ｅを、箔引出し口７から取り出して巻取りリール９に巻掛け、銅箔の前方端部３ｅを含む部分を粘着テープで固定した。 The cathode drum 1 of the example of the present invention prepared by the above-mentioned method was installed in an electrolytic bath 6 containing an electrolytic solution 8 capable of precipitating aluminum by an electrolytic precipitation method. Then, a part of the body surface 1a having the lead metal film 2 is immersed in the electrolytic solution 8 in which the aluminum anode member 5 is immersed, and the cathode drum 1 is opposed to the aluminum anode member 5. Placed. At this time, the portion of the lead metal film 2 including the rear region 2a in which the crystal structure is connected from the body surface 1a is arranged above the liquid surface that does not come into contact with the electrolytic solution 8 as shown in FIG. Subsequently, the front end portion 3e of the lead metal foil 3 connected from the body surface 1a of the cathode drum 1 in the winding direction is taken out from the foil drawer port 7 and wound around the winding reel 9, and the front end portion 3e of the copper foil is wound. The part containing the above was fixed with adhesive tape.

次に、胴体表面１ａと陽極部材５の間の通電による電解析出処理を行うことにより、アルミニウム箔の連続製造を行った。かかる電解析出処理では、約１１０℃に液温制御した電解液８が循環および撹拌する中で、電流密度を約１００ｍＡ／ｃｍ^２に制御して通電を行い、電解液８に最初に浸漬され、後にリード金属膜２となる銅膜の表面上にアルミニウムを析出させてアルミニウム膜（第１金属膜１０ａ）を形成した。これに続いて、電解液８に浸漬された銅膜の後方領域２ａを含む部分の表面上および隣接する胴体表面１ａにアルミニウムを析出させてアルミニウム膜（第１金属膜１０ａおよび第２金属膜１０ｂ）を形成した。これにより、第１金属膜１０ａから繋がる第２金属膜１０ｂを連続的に形成することができた。また、第１金属膜１０ａおよび第２金属膜１０ｂの形成と同時に、陰極ドラム１および巻取りリール９の同期回転によりリード材（リード金属箔３）を巻取りながら引いて胴体表面１ａから銅膜を剥離し、巻取られるリード金属箔３から繋がる新たな第２リード金属箔３ａを形成した。そして、リード金属箔３の巻取りを継続して第２リード金属箔３ａを引くことにより、第１金属膜１０ａを表面上に有し、後にリード材となる銅膜の後方領域２ａを含む部分（継ぎ目部分）を胴体表面１ａから剥離した。これに続いて、第１金属膜１０ａから繋がって後続する第２金属膜１０ｂを胴体表面１ａから剥離した。 Next, the aluminum foil was continuously manufactured by performing an electrolytic precipitation treatment between the body surface 1a and the anode member 5 by energization. In such electrolytic precipitation treatment, while the electrolytic solution 8 whose liquid temperature is controlled to about 110 ° C. is circulated and stirred, the current density is ^{controlled to about 100 mA / cm 2} to energize, and the electrolytic solution 8 is first immersed in the electrolytic solution 8. An aluminum film (first metal film 10a) was formed by precipitating aluminum on the surface of the copper film that would later become the lead metal film 2. Following this, aluminum is deposited on the surface of the portion including the rear region 2a of the copper film immersed in the electrolytic solution 8 and on the adjacent body surface 1a to deposit the aluminum film (first metal film 10a and second metal film 10b). ) Was formed. As a result, the second metal film 10b connected from the first metal film 10a could be continuously formed. Further, at the same time as the formation of the first metal film 10a and the second metal film 10b, the lead material (lead metal foil 3) is wound and pulled by the synchronous rotation of the cathode drum 1 and the take-up reel 9, and the copper film is pulled from the body surface 1a. Was peeled off to form a new second lead metal foil 3a connected from the wound lead metal foil 3. Then, by continuously winding the lead metal foil 3 and pulling the second lead metal foil 3a, a portion having the first metal film 10a on the surface and including the rear region 2a of the copper film which will later become the lead material. (Seam portion) was peeled off from the body surface 1a. Following this, the second metal film 10b connected to the first metal film 10a was peeled off from the body surface 1a.

図１３は、リード金属膜２（銅膜）と第２金属膜１０ｂ（アルミニウム膜）との継ぎ目部分を示す観察写真（倍率１００）である。観察表面は陰極ドラム１の胴体表面１ａから剥離された剥離面である。リード金属膜２と第２金属膜１０ｂおよび継ぎ目部分には明確な欠陥がなく、胴体表面１ａからの剥離が健全に行われたことを確認することができた。 FIG. 13 is an observation photograph (magnification 100) showing a joint portion between the lead metal film 2 (copper film) and the second metal film 10b (aluminum film). The observation surface is a peeled surface peeled from the body surface 1a of the cathode drum 1. There were no clear defects in the lead metal film 2, the second metal film 10b, and the joint portion, and it was confirmed that the peeling from the fuselage surface 1a was performed soundly.

こうして、アルミニウムからなる第１金属膜１０ａを表面上に有するリード金属膜２およびその後方領域２ａを含む部分が胴体表面１ａから剥離された後は、第１金属膜１０ａに繋がって後続するアルミニウムからなる第２金属膜１０ｂが連続的に剥離され、アルミニウム箔（金属箔１０）が連続的に形成された。そして、そのアルミニウム箔（金属箔１０）を巻取りリール９に連続的に巻取ることにより、本体部分の平均厚さが１２μｍで全幅が２００ｍｍの長尺のアルミニウム箔（電解アルミニウム箔）を作製することができた。 In this way, after the portion including the lead metal film 2 having the first metal film 10a made of aluminum on the surface and the rear region 2a thereof is peeled off from the body surface 1a, it is connected to the first metal film 10a and is connected to the following aluminum. The second metal film 10b was continuously peeled off, and an aluminum foil (metal foil 10) was continuously formed. Then, the aluminum foil (metal foil 10) is continuously wound around the take-up reel 9 to produce a long aluminum foil (electrolytic aluminum foil) having an average thickness of 12 μm and a total width of 200 mm. I was able to.

同様な製造方法により、リード金属膜およびリード金属箔の本体部分の平均厚さが２０μｍで、リード金属膜２の後方端２ｅの平均厚さを５μｍ〜１０μｍの範囲から選択して違えた幾つかのパターンの陰極ドラム１を用いて、アルミニウム箔（金属箔１０）の連続製造を行った。その結果、本発明例１、２のいずれのリード金属膜２も、その表面上に第１金属膜１０ａを形成するとともに胴体表面１ａに第２金属膜１０ｂを形成した後に、陰極ドラム１の胴体表面１ａから剥離することができた。同様に、その他の本発明例のいずれのパターンの陰極ドラム１を用いても、リード金属膜２は陰極ドラム１の胴体表面１ａから剥離することができた。これにより、長尺のアルミニウム箔１０を連続的に作製することができた。また、連続的に剥離して巻取ったリード金属箔３、３ａおよびアルミニウム箔（金属箔１０）には、リード金属箔とアルミニウム箔の継ぎ目部分での破損や、アルミニウム箔の局所的な厚さの変動や析出不良、変色、色むらは発生しなかった。 By the same manufacturing method, the average thickness of the lead metal film and the main body of the lead metal foil was 20 μm, and the average thickness of the rear end 2e of the lead metal film 2 was selected from the range of 5 μm to 10 μm. The aluminum foil (metal foil 10) was continuously manufactured using the cathode drum 1 having the pattern of. As a result, in each of the lead metal films 2 of Examples 1 and 2 of the present invention, after the first metal film 10a is formed on the surface thereof and the second metal film 10b is formed on the body surface 1a, the body of the cathode drum 1 is formed. It could be peeled off from the surface 1a. Similarly, using any of the other patterns of the cathode drum 1 of the present invention, the lead metal film 2 could be peeled off from the body surface 1a of the cathode drum 1. As a result, the long aluminum foil 10 could be continuously produced. Further, the lead metal foils 3, 3a and the aluminum foil (metal foil 10) that were continuously peeled and wound were damaged at the joint between the lead metal foil and the aluminum foil, and the local thickness of the aluminum foil was increased. No fluctuation, poor precipitation, discoloration, or uneven color occurred.

１．陰極ドラム
１ａ．胴体表面
２．リード金属膜
２ａ．後方領域
２ｅ．後方端
２ｓ．厚さ傾斜部
３．リード金属箔
３ａ．第２リード金属箔
３ｅ．前方端部
４．剥離位置
５．陽極部材
６．電解浴槽
７．箔引出し口
８．電解液
９．巻取りリール
１０ａ．第１金属膜
１０ｂ．第２金属膜
１００ａ．アルミニウム膜
１００ｂ．アルミニウム膜
２００．リード銅箔
２００ａ．後方領域
２００ｅ．後方端

1. 1. Cathode drum 1a. Fuselage surface 2. Reed metal film 2a. Rear region 2e. Rear end 2s. Thickness inclined part 3. Reed metal leaf 3a. 2nd lead metal leaf 3e. Front end 4. Peeling position 5. Anode member 6. Electrolytic bathtub 7. Foil drawer 8. Electrolyte 9. Winding reel 10a. First metal film 10b. Second metal film 100a. Aluminum film 100b. Aluminum film 200. Reed copper foil 200a. Rear region 200e. Rear end

Claims

A cathode drum used for peeling a metal film formed in an effective electrolytic region on the body surface to form a metal foil, wherein the cathode drum includes a lead material for initiating peeling of the metal film. The lead material has a lead metal film in which a crystal structure is connected from the body surface to cover a part of the effective electrolytic region on the body surface, and a crystal structure from the front end portion of the lead metal film in the rotational direction of the cathode drum. In the rear region of the lead metal film in the rotation direction of the cathode drum, the thickness decreases toward the rear end of the lead metal film. A cathode drum for metal leaf production, which has an inclined portion.

The cathode drum for producing a metal foil according to claim 1, wherein the average thickness of the rear end of the reed metal film is 3 μm or more and 70% or less of the average thickness of the metal foil.

The cathode drum for producing a metal foil according to claim 2, wherein the average thickness of the rear end of the lead metal film is 5 μm or more.

The cathode drum for producing a metal foil according to any one of claims 1 to 3, wherein the lead metal film has an average thickness of 10 μm or more and 50 μm or less.

Using the metal foil manufacturing cathode drum according to any one of claims 1 to 4, a part of the body surface having the lead metal film is immersed in an electrolytic solution in which an anode member is immersed, and The front end of the lead metal foil in the winding direction is fixed to the winding reel, and the rear region of the lead metal film immersed in the electrolytic solution is subjected to energization between the body surface and the anode member. The lead metal film is peeled off by forming a first metal film on the surface of the including portion, continuing the energization, and pulling the lead metal foil by rotating the cathode drum and the take-up reel. The first metal film is provided on the surface by forming a second lead metal foil connected from the lead metal foil, and further rotating the cathode drum and the take-up reel to pull the second lead metal foil. The portion of the lead metal film including the rear region is peeled off from the body surface, and then the second metal film connected to the first metal film and formed on the body surface is continuously peeled off from the body surface. A method for producing a metal foil, in which the metal foil formed in the above process is continuously wound around the take-up reel.