JPH05228564A - Manufacture of welded can body - Google Patents
Manufacture of welded can bodyInfo
- Publication number
- JPH05228564A JPH05228564A JP3336392A JP3336392A JPH05228564A JP H05228564 A JPH05228564 A JP H05228564A JP 3336392 A JP3336392 A JP 3336392A JP 3336392 A JP3336392 A JP 3336392A JP H05228564 A JPH05228564 A JP H05228564A
- Authority
- JP
- Japan
- Prior art keywords
- resin protective
- protective coating
- coating layer
- welded
- resin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
(57)【要約】
【目的】ウォーターベースのエアゾール製品のような腐
食性の強い内容物に対して優れた耐蝕性を有する溶接缶
体の製造方法を提供する。
【構成】薄錫めっき鋼板製缶胴ブランクを両端縁部で重
ね合わせて溶接接合して、図１（ａ）に示す缶胴１を形
成する。次に、缶胴１の溶接接合部３の内外面側に溶剤
型エポキシ系補修塗料を用いて第１の樹脂保護被覆層４
を形成する。次に、缶胴１の缶内面側全体に平均粒子径
約８μｍの熱硬化性エポキシ樹脂系粉体塗料を静電塗装
したのち、２００℃で２分間焼き付けを行い、厚さ約２
２μｍの第２の樹脂保護被覆層５を形成する。次に、缶
胴１の両端部にネックイン加工及びフランジ加工を施
し、別途作成したエアゾール缶用底蓋及び天蓋（目金）
を二重巻締めして取着し、さらに前記天蓋にマウンティ
ングキャップを取着して、エアゾール容器用溶接缶体を
製造する。
(57) [Abstract] [Purpose] To provide a method for manufacturing a welded can body having excellent corrosion resistance to highly corrosive contents such as water-based aerosol products. [Structure] Can tin blanks made of thin tin-plated steel plates are overlapped at both edge portions and welded to each other to form a can body 1 shown in FIG. Next, the first resin protective coating layer 4 is formed on the inner and outer surfaces of the welded joint portion 3 of the can body 1 by using a solvent-type epoxy-based repair paint.
To form. Next, a thermosetting epoxy resin powder coating having an average particle diameter of about 8 μm is electrostatically coated on the entire inner surface of the can body 1, and then baked at 200 ° C. for 2 minutes to give a thickness of about 2
A second resin protective coating layer 5 having a thickness of 2 μm is formed. Next, both ends of the can body 1 are subjected to neck-in processing and flange processing, and a bottom lid and a canopy (mesh) for an aerosol can, which are separately created.
Is double-wound and attached, and then a mounting cap is attached to the canopy to manufacture a welding can body for an aerosol container.
Description
【０００１】[0001]
【産業上の利用分野】本発明は溶接缶体の製造方法に関
するものであり、更に詳しくはヘアムースなどのように
ウォーターベースで腐食性の強いエアゾール製品の容器
に適した溶接缶体の製造方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a welded can body, and more particularly to a method of manufacturing a welded can body suitable for containers of aerosol products that are highly water-based and highly corrosive, such as hair mousses. It is a thing.
【０００２】[0002]
【従来の技術】従来のエアゾール製品はアルコール等の
溶剤を主体とするソルベントベースのものが主として用
いられており、前記エアゾール製品を内容物として充填
するエアゾール容器には主として溶剤型エポキシフェノ
ール樹脂系塗料又は溶剤型エポキシユリア樹脂系塗料の
いずれかを各々２層塗りの内面焼き付け塗装を行ったス
チール製溶接缶体が用いられている。2. Description of the Related Art Conventional aerosol products are mainly solvent-based ones mainly composed of a solvent such as alcohol, and solvent-type epoxy phenolic resin-based paint is mainly used for an aerosol container filled with the aerosol product as a content. Alternatively, a steel welding can body is used in which any of solvent-based epoxy urea resin-based paints has been subjected to a two-layer inner surface baking finish.
【０００３】近年、ヘアムースなどのように泡状エアゾ
ール内容物を用いたエアゾール製品が活発に実用化され
ている。ところが、前記泡状エアゾール内容物の多くは
弱酸性を有し水分含有率が２０％以上のウォーターベー
スのものであり、このような泡状エアゾール内容物を従
来からのソルベントベースのエアゾール製品に用いられ
ている内面塗装を行ったスチール製溶接缶体に充填する
と、前記溶接缶体に施されている内面塗装では耐蝕性が
不十分であるために缶体の基体金属に腐食または孔食が
発生する傾向がある。In recent years, aerosol products using foamy aerosol contents such as hair mousses have been actively put into practical use. However, most of the foam aerosol contents are water-based ones having weak acidity and a water content of 20% or more, and such foam aerosol contents are used for conventional solvent-based aerosol products. When a steel welded can body with an inner surface coating is filled, corrosion or pitting occurs in the base metal of the can because the inner surface coating applied to the welding can body has insufficient corrosion resistance. Tend to do.
【０００４】前記溶接缶体の内面塗装の塗膜厚を厚くす
れば耐蝕性を増大させることができるが、このために前
記溶剤型塗料を一挙に膜厚に塗布すると、焼き付け時に
塗膜が発泡して塗装不良を生じたり、加工性が低下して
前記溶接缶体の端部にネックイン加工や缶蓋の巻締め加
工を行う際に該加工による変形部の塗膜にクラックを生
じてその部分に腐食が発生する。従って、溶剤型塗料に
より十分な耐蝕性を有する塗膜を形成しようとすると、
少量ずつ塗装して焼き付ける操作を多数回に亘って繰り
返さなければならず、工程が煩雑になる。The corrosion resistance can be increased by increasing the coating thickness of the inner surface coating of the welding can body. For this reason, if the solvent-based coating material is applied to the coating thickness all at once, the coating film foams during baking. When a coating failure occurs or the workability is lowered and neck-in processing or can lid winding processing is performed at the end of the welded can body, cracks occur in the coating film at the deformed portion due to the processing. Corrosion occurs on the part. Therefore, if you try to form a coating film with sufficient corrosion resistance with solvent-based paint,
The process of coating and baking a small amount must be repeated many times, which complicates the process.
【０００５】アルミ合金またはエアゾール容器のマウン
ティングキャップに用いられる膜厚１００μｍ程度のプ
ラスチックフィルムをラミネートしたスチール材によれ
ば、前記ウォーターベースのエアゾール内容物に対して
十分な耐蝕性が得られるが、これらの材料からなる容器
は非常に高価であるので、安価で前記エアゾール内容物
に対して十分な耐蝕性を有する内面塗装が施されたスチ
ール製溶接缶体の開発が望まれる。A steel material laminated with a plastic film having a film thickness of about 100 μm, which is used for a mounting cap of an aluminum alloy or an aerosol container, can provide sufficient corrosion resistance to the water-based aerosol contents. Since the container made of the above material is very expensive, it is desired to develop an inexpensive steel welded can body having an inner surface coating which has sufficient corrosion resistance to the aerosol contents.
【０００６】前記問題を解決するために、特開平１−２
１４４３３号公報には、缶胴内面を直接被覆する第１層
にエポキシ・フェノール樹脂系塗料によりその乾燥塗膜
厚１〜８μｍの第１樹脂保護被覆層を設け、前記第１層
に上塗りされる第２層にはガラス転移温度が５０℃以上
のビニル・オルガノゾル系塗料により乾燥塗膜厚３〜２
０μｍの第２樹脂保護被覆層を設けてなるスチール材か
ら形成された溶接缶体を用いたエアゾール容器が開示さ
れている。前記公報に開示されたエアゾール容器は、ガ
ラス転移温度が５０℃以上のビニル・オルガノゾル系塗
料により耐水性が確保されるので、水分含有率が２０％
以上のウォーターベースのエアゾール製品を充填しても
スチール製の基体金属に腐食または孔食が発生すること
がなく、前記エアゾール製品の容器として好適に使用す
ることができる。In order to solve the above problem, Japanese Patent Laid-Open No. 1-22
According to Japanese Patent No. 14433, a first resin protective coating layer having a dry coating film thickness of 1 to 8 μm is provided on the first layer for directly coating the inner surface of the can body with an epoxy / phenolic resin-based coating, and the first layer is overcoated. The second layer is made of a vinyl-organosol-based coating material having a glass transition temperature of 50 ° C. or higher and a dry coating film thickness of 3 to 2
An aerosol container using a welding can body made of a steel material provided with a second resin protective coating layer of 0 μm is disclosed. The aerosol container disclosed in the above publication has a water content of 20% because its water resistance is secured by a vinyl-organosol-based coating material having a glass transition temperature of 50 ° C. or higher.
Even when the above water-based aerosol product is filled, corrosion or pitting does not occur in the steel base metal, and it can be suitably used as a container for the aerosol product.
【０００７】前記エアゾール容器に用いられる溶接缶体
は、前記公報に記載された製造方法によれば、まず、ス
チール材の薄板の缶胴内面側に缶胴ブランクの両端縁部
となる部分を除いて前記エポキシ・フェノール樹脂系塗
料をローラコーティングして焼付けし乾燥塗膜厚１〜８
μｍの第１樹脂保護被覆層を形成し、次いで前記第１樹
脂保護被覆層の上に前記ビニル・オルガノゾル系塗料を
ローラコーティングして焼付けし乾燥塗膜厚３〜２０μ
ｍの第２樹脂保護被覆層を形成する。次に、第１及び第
２の両樹脂保護被覆層が形成された前記薄板をブランク
サイズに裁断し、これを両端縁部で重ね合わせて筒状に
形成して溶接し、缶胴を形成する。前記缶胴の溶接接合
部には塗装が施されていないので、缶胴形成後に前記溶
接接合部を補修塗装する。そして、前記缶胴の一方の端
部に缶蓋を巻締め、缶内面側を補修塗装したのち、他方
の端部に缶蓋を巻締めマウンティングキャップを取着す
ることにより製造される。According to the manufacturing method described in the above-mentioned publication, the welding can body used for the aerosol container is formed by first removing a portion of both ends of the can body blank on the inner surface side of the can body of a thin steel plate. Roll coating the epoxy / phenolic resin-based paint and baking to dry film thickness 1-8
A first resin protective coating layer having a thickness of μm is formed, and then the vinyl-organosol-based coating material is roller-coated on the first resin protective coating layer and baked to obtain a dry coating film thickness of 3 to 20 μm.
m second resin protective coating layer is formed. Next, the thin plate on which the first and second resin protective coating layers are formed is cut into a blank size, which is overlapped at both end edges to form a tubular shape and welded to form a can body. .. Since the welded joint portion of the can body has not been painted, the welded joint portion is repaired and painted after the can body is formed. Then, the can lid is wound around one end of the can body, the inner surface of the can is repair-painted, and then the can lid is wound around the other end and a mounting cap is attached.
【０００８】しかしながら、前記製造方法によれば、ビ
ニル・オルガノゾル系塗料からなる第２樹脂保護被覆層
により十分な耐水性を確保するためには、下塗り層とし
てエポキシ・フェノール樹脂系塗料からなる第１樹脂保
護被覆層を形成することが不可欠であり、第１及び第２
の両樹脂保護被覆層をそれぞれ塗装して焼き付けなけれ
ばならないので、工程が煩雑になるとの不都合がある。
また、前記製造方法では、第１及び第２の両樹脂保護被
覆層の形成後にスチール材の薄板をブランクサイズに裁
断し、筒状に形成して溶接するので、このような処理に
より樹脂保護被覆層に傷が付くことがあり、ウォーター
ベースのエアゾール製品のような腐食性の強い内容物を
充填すると、前記傷から腐食が生じる虞れがある。However, according to the above-mentioned manufacturing method, in order to secure sufficient water resistance by the second resin protective coating layer made of the vinyl-organosol-based paint, the first resin layer made of the epoxy-phenol resin-based paint is used as the undercoat layer. It is essential to form the resin protective coating layer, and the first and second
Since both of the resin protective coating layers must be coated and baked, there is a disadvantage that the process becomes complicated.
Further, in the above-mentioned manufacturing method, after the first and second resin protective coating layers are formed, the thin plate of steel material is cut into a blank size, formed into a tubular shape, and welded. The layers can be scratched and the filling of highly corrosive contents such as water-based aerosol products can result in corrosion from the scratches.
【０００９】前記公報には、スチール製エアゾール容器
の別の製造方法として、前記と同様にして第１樹脂保護
被覆層を形成した前記薄板をブランクサイズに裁断し、
両端縁部で重ね合わせて溶接して缶胴を形成したのち、
前記缶胴の溶接接合部を補修塗装して、さらに缶胴内面
側に前記ビニル・オルガノゾル系塗料をスプレーコーテ
ィングして焼付けし、第２樹脂保護被覆層を形成する製
造方法が記載されている。In the above publication, as another method for manufacturing a steel aerosol container, the thin plate on which the first resin protective coating layer is formed is cut into a blank size in the same manner as described above.
After overlapping and welding at both edges to form a can body,
A manufacturing method is described in which the welded joint portion of the can body is repair-painted, and the vinyl-organosol-based paint is spray-coated and baked on the inner surface of the can body to form a second resin protective coating layer.
【００１０】前記製造方法によれば形成後の前記樹脂保
護被覆層に傷が付くことを避けることができるが、前記
のように塗料をスプレーコーティングする製造方法によ
るときには、スプレーコーティングに使用する塗料の固
形分量を低くしなければならないため、所望の厚さの塗
膜を得るためには塗装と焼き付けとを複数回に亘って繰
り返さねばならず、工程がさらに煩雑になる。According to the above-mentioned manufacturing method, it is possible to prevent the resin protective coating layer after formation from being scratched. However, in the case of the manufacturing method in which the coating material is spray-coated as described above, the coating material used for spray coating is Since the solid content must be reduced, the coating and baking must be repeated a plurality of times to obtain a coating film having a desired thickness, which further complicates the process.
【００１１】一方、アルミ合金材などの薄板からしごき
加工又は絞りしごき加工によって形成された底部を有す
る缶胴では、缶体に粉体塗料からなる樹脂保護被覆層を
形成する技術が知られている。前記底部を有する缶胴は
缶内面側に段差及び突起などがなく平滑であるので、下
塗り層を設けることなく、粉体塗料を静電塗装により付
着させたのち加熱溶融させて焼き付けることにより、所
望の膜厚を有する樹脂保護被覆層を容易に形成すること
ができる。On the other hand, in a can body having a bottom formed by ironing or drawing and ironing from a thin plate such as an aluminum alloy material, a technique for forming a resin protective coating layer made of powder coating on the can body is known. .. Since the can body having the bottom portion is smooth without steps and protrusions on the inner surface side of the can, the powder coating material is applied by electrostatic coating and then heated and melted and baked without forming an undercoat layer. It is possible to easily form the resin protective coating layer having a film thickness of.
【００１２】しかしながら、溶接缶体に粉体塗料により
樹脂保護被覆層を形成しようとすると、前記溶接缶体に
は溶接接合部に缶胴ブランクの重ね合わせによる段差及
び溶接の際に生じた突起などの凹凸があるので粉体塗料
が均一に付着しにくく、耐蝕性に優れた樹脂保護被覆層
が得られにくい。また、前記溶接缶体の一方の端部に缶
蓋を巻締めたのち、前記粉体塗料からなる樹脂保護被覆
層を形成しようとすると、溶接接合部に缶蓋が巻締めら
れた部分では特に前記粉体塗料が付着しにくく、塗装欠
陥が生じやすいという不都合がある。However, if a resin protective coating layer is to be formed on the welding can body by powder coating, the welding can body will have a step due to the stacking of the can body blanks at the welded joint and a protrusion or the like generated during welding. Due to the unevenness, it is difficult to uniformly attach the powder coating, and it is difficult to obtain a resin protective coating layer having excellent corrosion resistance. Further, after the can lid is fastened to one end of the welded can body and a resin protective coating layer made of the powder coating material is to be formed, particularly at a portion where the can lid is fastened to the welded joint. There is a disadvantage that the powder coating material does not adhere easily and coating defects easily occur.
【００１３】[0013]
【発明が解決しようとする課題】本発明は、かかる不都
合を解消して、ウォーターベースのエアゾール製品のよ
うな腐食性の強い内容物に対して優れた耐蝕性を有する
溶接缶体の製造方法を提供することを目的とする。SUMMARY OF THE INVENTION The present invention solves the above problems and provides a method of manufacturing a welding can body having excellent corrosion resistance to highly corrosive contents such as water-based aerosol products. The purpose is to provide.
【００１４】[0014]
【課題を解決するための手段】かかる目的を達成するた
めに、本発明の溶接缶体の製造方法は、スチール材の薄
板からなる缶胴ブランクを両端縁部で重ね合わせて溶接
接合して筒状の缶胴を形成する缶胴形成工程と、該缶胴
の溶接接合部の缶内面側に第１の樹脂保護被覆層を形成
して溶接接合部を被覆する溶接接合部被覆工程と、該缶
胴の缶内面側全体に粉体塗装により第２の樹脂保護被覆
層を形成して缶胴の内面を被覆する内面被覆工程と、前
記第１及び第２の両樹脂保護被膜層を形成した缶胴の端
部に缶蓋を巻締める缶蓋巻締め工程とからなることを特
徴とする。In order to achieve the above object, a method for manufacturing a welded can body according to the present invention is a cylinder in which can body blanks made of thin steel plates are overlapped at both end edges and welded together. A can body forming step of forming a can body having a rectangular shape, a welding joint part covering step of forming a first resin protective coating layer on the can inner surface side of the welded joint part of the can body and covering the welded joint part, An inner surface coating step of forming a second resin protective coating layer on the entire inner surface of the can body by powder coating to coat the inner surface of the can body, and both the first and second resin protective coating layers were formed. A can lid winding step of winding a can lid around the end of the can body.
【００１５】前記製造方法において得られる溶接缶体に
ウォーターベースのエアゾール製品のような腐食性の強
い内容物が充填されるときには、前記内面被覆工程にお
いて第２の樹脂保護被覆層を１０〜１００μｍ、好まし
くは２０〜５０μｍの厚さに形成する。前記第２の樹脂
保護被覆層の厚さが１０μｍ以下であるときには腐食性
の強い内容物により缶体に腐食が生じることがあり、１
００μｍ以上であるときにはネックイン加工、フランジ
加工、缶蓋の二重巻締めなどの工程で変形する部分の前
記第２の樹脂保護被覆層に亀裂や剥離が生じることがあ
る。When the welding can obtained in the above-mentioned manufacturing method is filled with a highly corrosive content such as a water-based aerosol product, the second resin protective coating layer is added in an amount of 10 to 100 μm in the inner surface coating step, The thickness is preferably 20 to 50 μm. When the thickness of the second resin protective coating layer is 10 μm or less, the can body may be corroded due to the content having strong corrosiveness.
When the thickness is 00 μm or more, cracks or peeling may occur in the second resin protective coating layer in the portion which is deformed in the process such as neck-in processing, flange processing, double winding of the can lid and the like.
【００１６】一般に、溶接缶体は缶胴ブランクを両端縁
部で重ね合わて溶接するので溶接接合部に段差を有して
おり、また前記溶接の際に針状或は鱗状の突起を生じ
る。前記段差及び突起などの凹凸は第２の樹脂保護被覆
層だけでは十分に被覆できないことがあるので、前記製
造方法では溶接接合部の缶内面側に第１の樹脂保護被覆
層を形成する。前記第１の樹脂保護被覆層は、従来公知
の塗装補修用塗料から形成することができ、溶剤型エポ
キシ樹脂系塗料またはエポキシ樹脂系、ポリエステル樹
脂系等の粉体塗料をローラコートまたはスプレーコート
により塗装したのち焼き付けることにより形成される。Generally, the welded can body has a step at the welded joint because the can body blanks are overlapped and welded at both edge portions, and needle-like or scale-like protrusions are produced during the welding. Since the unevenness such as the steps and the protrusions may not be sufficiently covered only by the second resin protective coating layer, the first resin protective coating layer is formed on the inner surface side of the can of the welded joint in the manufacturing method. The first resin protective coating layer can be formed from a conventionally known coating repair paint, and solvent-based epoxy resin-based paint or powder paint such as epoxy resin-based or polyester resin-based paint is applied by roller coating or spray coating. It is formed by painting and baking.
【００１７】前記第１の樹脂保護被覆層は、その上に第
２の樹脂保護被覆層が形成されるので、前記段差及び突
起を完全に被覆するものでなくともよく、前記焼き付け
も完全でなくともよい。前記第１の樹脂保護被覆層の焼
き付けは、溶剤型エポキシ樹脂系塗料の場合には溶剤成
分がほぼ揮発している程度、エポキシ・ポリエステル系
粉体塗料の場合には塗料が溶融して缶体から脱落しない
程度であればよく、後工程の第２の樹脂保護被覆層を形
成する際に同時に焼き付けることができる。Since the second resin protective coating layer is formed on the first resin protective coating layer, it is not necessary to completely cover the step and the protrusion, and the baking is not complete. Good. The baking of the first resin protective coating layer is carried out by melting the solvent component in the case of a solvent-type epoxy resin-based paint and melting the solvent component in the case of an epoxy-polyester-based powder paint, and by heating the can body. As long as it does not fall off, it can be baked at the same time when the second resin protective coating layer is formed in the subsequent step.
【００１８】前記第２の樹脂保護被膜層を形成する粉体
塗料は、前記第１の樹脂保護被覆層を形成する塗料と親
和性に優れていることが好ましい。このような粉体塗料
としては、熱硬化性エポキシ樹脂系塗料、エポキシ・ポ
リエステル系塗料、熱可塑性ポリエステル系塗料のいず
れか一種が好ましく、さらに前記第１及び第２の両樹脂
保護被覆層が同系統の塗料の組み合せとなるようにする
ことが望ましい。The powder coating material forming the second resin protective coating layer preferably has excellent affinity with the coating material forming the first resin protective coating layer. As such a powder coating material, any one of thermosetting epoxy resin coating material, epoxy / polyester coating material and thermoplastic polyester coating material is preferable, and both the first and second resin protective coating layers are the same. It is desirable to use a combination of system paints.
【００１９】前記粉体塗料には公知の各種添加剤を配合
してもよく、酸化チタン、酸化亜鉛、硫酸バリウム等の
顔料、前記第２の樹脂保護被覆層の表面状態等を改善す
るためのレベリング剤、ネックイン加工、フランジ加工
等で前記第２の樹脂保護被覆層に傷が付くことを防止す
るための各種滑剤等を配合することが望ましい。Various known additives may be added to the powder coating material to improve pigments such as titanium oxide, zinc oxide and barium sulfate, and the surface condition of the second resin protective coating layer. It is desirable to add various lubricants and the like for preventing the second resin protective coating layer from being scratched by a leveling agent, neck-in processing, flange processing and the like.
【００２０】前記粉体塗料は、平均粒子径が４０μｍ以
下、さらに２０μｍ以下であることが好ましく、平均粒
子径が前記範囲にあることにより、内容物の腐食特性に
応じて前記範囲で必要且つ十分な厚さを有する樹脂保護
被覆層を形成することができる。前記粉体塗料の平均粒
子径が４０μｍ以上であるときには、形成される樹脂保
護被覆層に欠陥が生じやすくなり、欠陥の発生を防止す
るためには、さらに厚い樹脂保護被覆層を形成する必要
がある。The powder coating material preferably has an average particle size of 40 μm or less, more preferably 20 μm or less. By having the average particle size in the above range, it is necessary and sufficient within the above range depending on the corrosion characteristics of the contents. A resin protective coating layer having a uniform thickness can be formed. When the average particle diameter of the powder coating material is 40 μm or more, defects are likely to occur in the resin protective coating layer formed, and in order to prevent the occurrence of defects, it is necessary to form a thicker resin protective coating layer. is there.
【００２１】前記缶胴ブランクは、両端縁に溶接のため
の金属露出部を残して缶内面側に溶剤型エポキシ系塗料
が塗布されていることが耐蝕性を向上させる上で好まし
い。前記エポキシ系塗料としては、例えば、エポキシ樹
脂とレゾール型フェノール樹脂とを７０：３０〜９０：
１０の割合で配合したエポキシ・フェノール系塗料、エ
ポキシ樹脂とアミノブラスト樹脂とを８０：２０〜９
０：１０の割合で配合したエポキシ・アミノ樹脂等を挙
げることができる。前記エポキシ系塗料により形成され
る塗膜の厚さは２〜５μｍであることが好ましい。２μ
ｍ以下では耐蝕性を向上させる効果が十分に得られない
ことがあり、該塗膜の上にはさらに前記第２の樹脂保護
被覆層が形成されるので５μｍ以上とすることは不要で
ある。In order to improve the corrosion resistance, it is preferable that the can body blank is coated with a solvent-type epoxy paint on the inner surface of the can leaving metal exposed portions for welding at both edges. As the epoxy-based paint, for example, an epoxy resin and a resol-type phenol resin are 70:30 to 90:
Epoxy / phenolic paint, epoxy resin and aminoblast resin mixed in a ratio of 10: 80: 20-9
Epoxy-amino resin etc. which were mix | blended in the ratio of 0:10 can be mentioned. The thickness of the coating film formed by the epoxy-based paint is preferably 2 to 5 μm. 2μ
If it is less than m, the effect of improving the corrosion resistance may not be sufficiently obtained, and the second resin protective coating layer is further formed on the coating film.
【００２２】[0022]
【作用】本発明の製造方法によれば、缶胴ブランクの両
端縁部を重ね合わせて溶接することにより形成された缶
胴の溶接接合部の缶内面側を前記第１の樹脂保護被覆層
により被覆するので、前記重ね合わせによる段差及び溶
接の際に生じる突起などの凹凸が隠蔽される。次に、前
記第１の樹脂保護被覆層により溶接接合部周辺の凹凸が
隠蔽されて平滑になった缶胴の内面側全体に、粉体塗装
をすることにより、前記粉体塗料が均一に付着し塗装欠
陥のない第２の樹脂保護被覆層が得られる。そして、前
記第２の樹脂保護被覆層を形成したのち前記缶胴の端部
に缶蓋を巻締めるので、缶蓋巻締部の周辺においても前
記第２の樹脂保護被覆層に塗装欠陥のない溶接缶体が得
られる。According to the manufacturing method of the present invention, the can inner surface side of the welded joint portion of the can body formed by overlapping and welding both end edges of the can body blank by the first resin protective coating layer. Since it is covered, the unevenness such as the step due to the superposition and the protrusions generated at the time of welding are hidden. Next, by applying powder coating to the entire inner surface side of the can body, in which the irregularities around the welded joint are hidden by the first resin protective coating layer and smoothed, the powder coating material is evenly attached. A second resin protective coating layer free of coating defects is obtained. Then, after the second resin protective coating layer is formed, the can lid is wound around the end of the can body, so that there is no coating defect in the second resin protective coating layer even around the can lid winding portion. A welding can is obtained.
【００２３】前記第２の樹脂保護被覆層は、１０〜１０
０μｍの範囲の厚さに形成することにより、ヘアムース
などウォーターベースのエアゾール製品のような腐食性
の強い内容物に対しても、優れた耐蝕性が得られる。The second resin protective coating layer comprises 10 to 10
By forming a thickness in the range of 0 μm, excellent corrosion resistance can be obtained even for highly corrosive contents such as water-based aerosol products such as hair mousse.
【００２４】前記第２の樹脂保護被膜層を形成する粉体
塗料は、熱硬化性エポキシ樹脂系塗料、エポキシ・ポリ
エステル系塗料、熱可塑性ポリエステル系塗料のいずれ
か一種を用いることにより、前記第１及び第２の両樹脂
保護被覆層の間で優れた層間密着性が得られる。As the powder coating material forming the second resin protective coating layer, any one of thermosetting epoxy resin coating material, epoxy / polyester coating material and thermoplastic polyester coating material is used to obtain the first coating material. Also, excellent interlayer adhesion can be obtained between the first and second resin protective coating layers.
【００２５】前記粉体塗料は平均粒子径が４０μｍ以下
であることにより、前記第２の樹脂保護被覆層が内容物
の腐食性に応じて必要且つ十分な厚さに形成される。Since the average particle diameter of the powder coating material is 40 μm or less, the second resin protective coating layer is formed in a necessary and sufficient thickness depending on the corrosiveness of the contents.
【００２６】前記缶胴ブランクは、両端縁部に溶接のた
めの金属露出部を残して缶内面側に溶剤型エポキシ系塗
料からなる下塗り層が形成されていることにより、前記
第２の樹脂保護被覆層の耐蝕性がさらに向上される。In the can body blank, an undercoat layer made of a solvent-type epoxy paint is formed on the inner surface of the can, leaving metal exposed portions for welding at both end portions, so that the second resin protection can be achieved. The corrosion resistance of the coating layer is further improved.
【００２７】[0027]
【実施例１】次に、添付の図面を参照しながら本発明の
溶接缶体の製造方法についてさらに詳しく説明する。図
１（ａ）は本発明に係わる一実施例の製造方法で得られ
た溶接缶体の内面塗装の構成を概念的に示す一部断面
図、図１（ｂ）は他の実施例の製造方法で得られた溶接
缶体の内面塗装の構成を概念的に示す一部断面図、図２
は従来例の製造方法で得られた溶接缶体の内面塗装の構
成を概念的に示す一部断面図である。[Embodiment 1] Next, a method of manufacturing a welded can according to the present invention will be described in more detail with reference to the accompanying drawings. FIG. 1 (a) is a partial sectional view conceptually showing the constitution of the inner surface coating of the welding can body obtained by the manufacturing method of one embodiment according to the present invention, and FIG. 1 (b) is the manufacturing of another embodiment. 2 is a partial cross-sectional view conceptually showing the constitution of the inner surface coating of the welding can body obtained by the method, FIG.
FIG. 4 is a partial cross-sectional view conceptually showing the constitution of the inner surface coating of the welding can body obtained by the conventional manufacturing method.
【００２８】厚さ０．２０ｍｍ、スズめっき量５．６ｇ
／ｍ2 の薄錫めっき鋼板からなり、両端縁部に溶接のた
めの金属露出部を残して缶外面側にアクリル系クリア樹
脂を塗装した缶胴ブランクを両端縁部で重ね合わせて溶
接接合して、図１（ａ）に示す直径５２．４ｍｍ、高さ
約１４５ｍｍの筒状の缶胴１を形成した。前記缶胴１
は、缶外面側に前記アクリル系クリア樹脂からなる塗膜
２が形成されている。Thickness 0.20 mm, tin plating amount 5.6 g
/ M 2 thin tin-plated steel sheet, and a can body blank coated with clear acrylic resin on the outer surface of the can, leaving metal exposed parts for welding on both end parts, is welded by overlapping at both end parts. As a result, a tubular can body 1 having a diameter of 52.4 mm and a height of about 145 mm shown in FIG. The can body 1
Has a coating film 2 made of the acrylic clear resin formed on the outer surface of the can.
【００２９】次に、缶胴１の溶接接合部３の内外面側に
溶剤型エポキシ系補修塗料を用いて約２０μｍの厚さの
第１の樹脂保護被覆層４を形成した。樹脂保護被覆層４
は、前記溶剤型エポキシ系補修塗料を塗布したのち缶体
外面側から３００〜４００℃の熱風を約８秒間吹きつけ
て焼き付けを行った。前記溶剤型エポキシ系補修塗料と
しては、エポキシ樹脂９０部とウレア樹脂１０部とから
なる溶剤系エポキシウレア系塗料を用いた。Next, a first resin protective coating layer 4 having a thickness of about 20 μm was formed on the inner and outer surface sides of the welded joint portion 3 of the can body 1 by using a solvent type epoxy repair paint. Resin protective coating layer 4
After applying the solvent type epoxy-based repair paint, hot air of 300 to 400 ° C. was blown for about 8 seconds from the outer surface side of the can body for baking. As the solvent-type epoxy-based repair paint, a solvent-based epoxy-urea-based paint composed of 90 parts of an epoxy resin and 10 parts of a urea resin was used.
【００３０】次に、缶胴１の缶内面側全体に平均粒子径
約８μｍの熱硬化性エポキシ樹脂系粉体塗料を静電塗布
したのち、２００℃で２分間焼き付けを行い、厚さ約２
２μｍの第２の樹脂保護被覆層５を形成した。前記熱硬
化性エポキシ樹脂系粉体塗料としては、エポキシ樹脂
（シェル社製、エピュート１００４）９０部と無水トリ
メリット酸１０部とを主体とする粉体塗料を用いた。Next, a thermosetting epoxy resin powder coating having an average particle diameter of about 8 μm is electrostatically applied to the entire inner surface of the can body 1 and then baked at 200 ° C. for 2 minutes to give a thickness of about 2
A second resin protective coating layer 5 having a thickness of 2 μm was formed. As the thermosetting epoxy resin-based powder coating, a powder coating mainly composed of 90 parts of an epoxy resin (Eput 1004 manufactured by Shell Co.) and 10 parts of trimellitic anhydride was used.
【００３１】次に、缶胴１の両端部にネックイン加工及
びフランジ加工を施し、別途作成したエアゾール缶用底
蓋及び天蓋（目金）を二重巻締めして取着し、さらに前
記天蓋にマウンティングキャップを取着して、エアゾー
ル容器用溶接缶体を製造した。尚、前記底蓋、天蓋及び
マウンティングキャップは、内外面に二軸延伸ポリエチ
レンテレフタレートフィルムをラミネートしたティン・
フリー・スチール（ＴＦＳ）板から作成されたものであ
る。Next, both ends of the can body 1 are subjected to neck-in processing and flange processing, and a separately prepared bottom lid and canopy (mesh) for an aerosol can are double-fastened and attached, and the canopy is further attached. A mounting cap was attached to and a welding can for an aerosol container was manufactured. The bottom lid, the canopy and the mounting cap are made of a tin / polyethylene terephthalate film laminated on the inner and outer surfaces.
It is made from Free Steel (TFS) board.
【００３２】本実施例で得られたエアゾール容器用溶接
缶体に、８０％−エタノール水、ヘアムース（水分含有
率７０％、ｐＨ６．２）、炭酸水をそれぞれ噴射剤とと
もに充填して、４５℃で３か月間保存し、缶胴内面の腐
食状態を評価した。その結果を表１に示す。The welded can body for an aerosol container obtained in this example was filled with 80% ethanol water, hair mousse (water content 70%, pH 6.2), and carbonated water together with a propellant, and the mixture was heated to 45 ° C. After being stored for 3 months, the corrosion state of the inner surface of the can body was evaluated. The results are shown in Table 1.
【００３３】[0033]
【実施例２】図１（ａ）に示す缶胴１において、第１の
樹脂保護被覆層４をエポキシ・ポリエステル系粉体塗料
により約３５μｍの厚さに静電塗装し、第２の樹脂保護
被覆層５を平均粒子径約１５μｍのエポキシ・ポリエス
テル系粉体塗料を静電塗装したのち２００℃で２分間焼
き付けを行い約２５μｍの厚さに形成した以外は、実施
例１と同様にしてエアゾール容器用溶接缶体を製造し
た。第１の樹脂保護被覆層４を形成する粉体塗料として
は熱硬化型エポキシ・ポリエステル系粉体塗料（バーニ
カラー社製）を、また第２の樹脂保護被覆層５を形成す
るエポキシ・ポリエステル系粉体塗料には、エポキシ樹
脂３６部、ポリエステル樹脂３６部、酸化チタン２８部
からなる顔料入り熱硬化型エポキシ・ポリエステル系粉
体塗料を使用した。[Embodiment 2] In the can body 1 shown in FIG. 1 (a), the first resin protective coating layer 4 is electrostatically coated with an epoxy / polyester powder coating to a thickness of about 35 μm to protect the second resin. An aerosol was formed in the same manner as in Example 1 except that the coating layer 5 was electrostatically coated with an epoxy / polyester powder coating having an average particle diameter of about 15 μm and then baked at 200 ° C. for 2 minutes to form a thickness of about 25 μm. Welded can bodies for containers were manufactured. The powder coating material for forming the first resin protective coating layer 4 is a thermosetting epoxy / polyester powder coating material (manufactured by Vernicolor), and the epoxy resin / polyester coating material for forming the second resin protective coating layer 5. As the powder coating material, a thermosetting epoxy-polyester powder coating material containing a pigment comprising 36 parts of epoxy resin, 36 parts of polyester resin and 28 parts of titanium oxide was used.
【００３４】本実施例で得られたエアゾール容器用溶接
缶体に、実施例１と同じ８０％−エタノール水、ヘアム
ース及び炭酸水をそれぞれ噴射剤とともに充填して、４
５℃で３か月間保存し、缶胴内面の腐食状態を評価し
た。その結果を表１に示す。The welding can body for an aerosol container obtained in this example was filled with the same 80% ethanol water, hair mousse and carbonated water as in Example 1 together with a propellant, and 4
It was stored at 5 ° C for 3 months, and the corrosion state of the inner surface of the can body was evaluated. The results are shown in Table 1.
【００３５】[0035]
【比較例１】図１（ａ）に示す缶胴１において、第１の
樹脂保護被覆層４を全く形成しなかった以外は、実施例
２と同様にしてエアゾール容器用溶接缶体を製造した。Comparative Example 1 A welded can body for an aerosol container was manufactured in the same manner as in Example 2 except that the first resin protective coating layer 4 was not formed in the can body 1 shown in FIG. 1 (a). ..
【００３６】本比較例で得られたエアゾール容器用溶接
缶体に、実施例１と同じ８０％−エタノール水、ヘアム
ース及び炭酸水をそれぞれ噴射剤とともに充填して、４
５℃で３か月間保存し、缶胴内面の腐食状態を評価し
た。その結果を表１に示す。The welding can body for an aerosol container obtained in this Comparative Example was filled with the same 80% ethanol water, hair mousse and carbonated water as in Example 1 together with a propellant, and 4
It was stored at 5 ° C for 3 months, and the corrosion state of the inner surface of the can body was evaluated. The results are shown in Table 1.
【００３７】[0037]
【比較例２】厚さ０．２０ｍｍ、スズめっき量０．８ｇ
／ｍ2 の薄錫めっき鋼板からなり、両端縁部に溶接のた
めの金属露出部を残して缶外面側にアクリル系クリア樹
脂を、缶内面側にエポキシ・フェノール樹脂系下塗り塗
料をそれぞれ塗装した缶胴ブランクを両端縁部で重ね合
わせて溶接接合して、図２に示す筒状の缶胴２１を形成
した。前記缶胴２１は実施例１で作成した缶胴１と同じ
大きさ及び形状を有している。缶胴２１は、缶外面側に
は前記アクリル系クリア樹脂からなる塗膜２２が形成さ
れており、缶内面側には前記エポキシ・フェノール樹脂
系下塗り塗料により塗装及び焼き付けを２回行って合計
で約１１μｍの厚さの樹脂保護被膜層２６が形成されて
いる。前記エポキシ・フェノール樹脂系下塗り塗料に
は、エポキシ樹脂８５部とレゾール型フェノール樹脂１
５部とからなる溶剤系塗料を使用した。[Comparative Example 2] Thickness 0.20 mm, tin plating amount 0.8 g
/ M 2 thin tin-plated steel sheet, with acrylic metal clear resin on the outside of the can and epoxy / phenolic resin undercoat paint on the inside of the can, leaving exposed metal for welding on both edges. The can body blanks were overlapped with each other at both end portions and welded to each other to form a tubular can body 21 shown in FIG. The can body 21 has the same size and shape as the can body 1 produced in the first embodiment. The can body 21 has a coating film 22 made of the acrylic clear resin formed on the outer surface side of the can, and the inner surface side of the can is coated and baked twice with the epoxy / phenolic resin-based undercoating paint in total. A resin protective coating layer 26 having a thickness of about 11 μm is formed. The epoxy / phenolic resin-based undercoat contains 85 parts of epoxy resin and 1 part of resol type phenolic resin.
A solvent-based paint consisting of 5 parts was used.
【００３８】次に、缶胴２１の溶接接合部２３の内面側
にエポキシ・ポリエステル樹脂系粉体塗料を用いて約８
０μｍの厚さの樹脂保護被覆層２４を形成し、補修塗装
を行った。前記エポキシ・ポリエステル樹脂系粉体塗料
には、実施例２で使用したものと同じ熱硬化型エポキシ
・ポリエステル系粉体塗料（バーニカラー社製）を使用
した。Next, an epoxy / polyester resin powder coating is applied to the inner surface of the welded joint portion 23 of the can body 21 for about 8 minutes.
A resin protective coating layer 24 having a thickness of 0 μm was formed and repair coating was performed. As the epoxy / polyester resin-based powder coating material, the same thermosetting epoxy / polyester-based powder coating material (manufactured by Vernicolor) as used in Example 2 was used.
【００３９】次に、缶胴２１を用いて実施例１と同様に
してエアゾール容器用溶接缶体を製造した。本比較例で
得られたエアゾール容器用溶接缶体に、実施例１と同じ
８０％−エタノール水、ヘアムース及び炭酸水をそれぞ
れ噴射剤とともに充填して、４５℃で３か月間保存し、
缶胴内面の腐食状態を評価した。その結果を表１に示
す。Next, a welding can body for an aerosol container was manufactured in the same manner as in Example 1 using the can body 21. The welding can body for an aerosol container obtained in this Comparative Example was filled with the same 80% ethanol water, hair mousse and carbonated water as in Example 1 together with a propellant, and stored at 45 ° C. for 3 months.
The corrosion state of the inner surface of the can body was evaluated. The results are shown in Table 1.
【００４０】[0040]
【実施例３】厚さ０．２０ｍｍ、スズめっき量０．８ｇ
／ｍ2 の薄錫めっき鋼板からなり、両端縁部に溶接のた
めの金属露出部を残して缶外面側にアクリル系クリア樹
脂を、缶内面側にエポキシ・フェノール樹脂系下塗り塗
料をそれぞれ塗装した缶胴ブランクを両端縁部で重ね合
わせて溶接接合して、図１（ｂ）に示す筒状の缶胴１１
を形成した。前記缶胴１１は実施例１で作成した缶胴１
と同じ大きさ及び形状を有している。缶胴１１は、缶外
面側には前記アクリル系クリア樹脂からなる塗膜１２が
形成されており、缶内面側には前記エポキシ・フェノー
ル樹脂系下塗り塗料が塗装、焼き付けされて約４μｍの
厚さの下塗り層１６が形成されている。前記エポキシ・
フェノール樹脂系下塗り塗料には、比較例２で使用した
ものと同じエポキシ樹脂８５部とレゾール型フェノール
樹脂１５部とからなる溶剤系塗料を使用した。[Example 3] Thickness 0.20 mm, tin plating amount 0.8 g
/ M 2 thin tin-plated steel sheet, with acrylic metal clear resin on the outside of the can and epoxy / phenolic resin undercoat paint on the inside of the can, leaving exposed metal for welding on both edges. The can body blanks are overlapped and weld-joined at both end portions to form a tubular can body 11 shown in FIG.
Formed. The can body 11 is the can body 1 prepared in the first embodiment.
It has the same size and shape as. The can body 11 has a coating film 12 made of the acrylic clear resin formed on the outer surface of the can, and the epoxy / phenolic resin-based undercoat paint is applied and baked on the inner surface of the can to a thickness of about 4 μm. The undercoat layer 16 is formed. The epoxy
As the phenol resin-based undercoat paint, a solvent-based paint composed of 85 parts of the same epoxy resin as used in Comparative Example 2 and 15 parts of the resol-type phenol resin was used.
【００４１】次に、缶胴１１の溶接接合部１３の内外面
側に溶剤型エポキシ系補修塗料を用いて約２０μｍの厚
さの第１の樹脂保護被覆層１４を形成した。樹脂保護被
覆層１４は、前記溶剤型エポキシ系補修塗料を塗布した
のち缶体外面側から３００〜４００℃の熱風を約８秒間
吹きつけて焼き付けを行った。前記溶剤型エポキシ系補
修塗料には、実施例１で使用したものと同じエポキシ樹
脂９０部とウレア樹脂１０部とからなる溶剤系エポキシ
ウレア系塗料を使用した。Next, a first resin protective coating layer 14 having a thickness of about 20 μm was formed on the inner and outer surface sides of the welded joint portion 13 of the can body 11 by using a solvent type epoxy repair paint. The resin protective coating layer 14 was baked by applying hot air at 300 to 400 ° C. for about 8 seconds from the outer surface side of the can after applying the solvent type epoxy-based repair paint. As the solvent-type epoxy-based repair paint, the same solvent-based epoxy-urea-based paint consisting of 90 parts of the epoxy resin and 10 parts of the urea resin used in Example 1 was used.
【００４２】次に、缶胴１１の缶内面側全体に平均粒子
径約３３μｍの熱可塑性ポリエステル樹脂系粉体塗料を
静電塗布したのち、２００℃で１分間焼き付けを行い、
厚さ約４０μｍの第２の樹脂保護被覆層１５を形成し
た。前記熱可塑性ポリエステル樹脂系粉体塗料には、熱
可塑性ポリエステル樹脂系粉体塗料（バニーカラー社
製）を使用した。Then, a thermoplastic polyester resin powder coating having an average particle diameter of about 33 μm is electrostatically applied to the entire inner surface of the can body 11 and then baked at 200 ° C. for 1 minute,
A second resin protective coating layer 15 having a thickness of about 40 μm was formed. As the thermoplastic polyester resin powder coating material, a thermoplastic polyester resin powder coating material (manufactured by Bunny Color Co., Ltd.) was used.
【００４３】次に、缶胴１１を用いて実施例１と同様に
してエアゾール容器用溶接缶体を製造した。本実施例で
得られたエアゾール容器用溶接缶体に、実施例１と同じ
８０％−エタノール水、ヘアムース及び炭酸水をそれぞ
れ噴射剤とともに充填して、４５℃で３か月間保存し、
缶胴内面の腐食状態を評価した。その結果を表１に示
す。Then, a welded can body for an aerosol container was manufactured in the same manner as in Example 1 using the can body 11. The welding can body for an aerosol container obtained in this example was filled with the same 80% -ethanol water, hair mousse and carbonated water as in Example 1 together with a propellant and stored at 45 ° C for 3 months.
The corrosion state of the inner surface of the can body was evaluated. The results are shown in Table 1.
【００４４】[0044]
【表１】 [Table 1]
【００４５】表１から明らかなように、実施例１及び実
施例２の製造方法により得られたエアゾール容器用溶接
缶体は缶内面側全体を被覆する第２の樹脂保護被覆層が
粉体塗料からなり十分な厚さを有するので、ウォーター
ベースの内容物（８０％−エタノール水）に対しても、
ウォーターベースで弱酸性の内容物（ヘアムース及び炭
酸水）に対しても優れた耐蝕性を有する。また、実施例
３の製造方法により得られたエアゾール容器用溶接缶体
は前記第２の樹脂保護被覆層が下塗り層の上に設けられ
ているので、前記内容物に対してさらに優れた耐蝕性を
有する。As is clear from Table 1, the welding can bodies for aerosol containers obtained by the manufacturing methods of Examples 1 and 2 have the second resin protective coating layer covering the entire inner surface of the can as the powder coating material. As it has a sufficient thickness, it is suitable for water-based contents (80% -ethanol water).
It has excellent corrosion resistance to water-based and weakly acidic contents (hair mousse and carbonated water). Further, since the welding can body for an aerosol container obtained by the manufacturing method of Example 3 has the second resin protective coating layer provided on the undercoat layer, it has further excellent corrosion resistance to the contents. Have.
【００４６】これに対して、溶接接合部に第１の樹脂保
護被覆層を設けていない比較例１のエアゾール容器用溶
接缶体では、溶接接合部の凹凸の隠蔽が不十分となり、
この部分に腐食が生じている。また、従来例の製造方法
により得られた比較例２のエアゾール容器用溶接缶体で
は、前記エポキシ・フェノール樹脂系下塗り塗料の塗装
及び焼き付けを２回行って前記ウォーターベースの各内
容物に対して十分耐蝕性を有する程度の膜厚の樹脂保護
被覆層を形成しているが、前記樹脂保護被覆層は形成後
の工程で傷が付いており、前記傷付いた部分に腐食が生
じている。On the other hand, in the welding can body for an aerosol container of Comparative Example 1 in which the first resin protective coating layer is not provided at the welded joint, the concavo-convexity of the welded joint is insufficiently concealed,
Corrosion occurs in this part. In addition, in the welding can body for an aerosol container of Comparative Example 2 obtained by the manufacturing method of the conventional example, the epoxy-phenol resin-based undercoat paint was applied and baked twice to each content of the water base. Although the resin protective coating layer having a film thickness of sufficient corrosion resistance is formed, the resin protective coating layer is scratched in the process after the formation, and the damaged portion is corroded.
【００４７】[0047]
【発明の効果】以上のことから明らかなように、本発明
の製造方法によれば、缶胴の溶接接合部の缶内面側に第
１の樹脂保護被覆層を設け溶接接合部の凹凸を隠蔽した
のち、缶内面側全体に粉体塗料からなる第２の樹脂保護
被覆層を設けるので、塗装欠陥のない塗膜を得ることが
できる。そして、前記第１及び第２の樹脂保護被覆層が
設けられた缶胴の端部に缶蓋を巻締めるので、缶蓋巻締
部の周辺においても第２の樹脂保護被覆層に塗装欠陥の
ない溶接缶体を得ることができる。As is apparent from the above, according to the manufacturing method of the present invention, the first resin protective coating layer is provided on the inner surface side of the can of the welded joint of the can body to conceal the unevenness of the welded joint. After that, since the second resin protective coating layer made of powder coating is provided on the entire inner surface of the can, a coating film free from coating defects can be obtained. Since the can lid is fastened around the end of the can body provided with the first and second resin protective coating layers, the second resin protective coating layer is not affected by coating defects even around the can lid winding portion. You can get no welding can.
【００４８】本発明の製造方法では、前記第２の樹脂保
護被覆層を１０〜１００μｍの範囲の厚さに形成するこ
とにより、ヘアムースなどウォーターベースのエアゾー
ル製品のような腐食性の強い内容物に対しても、優れた
耐蝕性を得ることができる。In the manufacturing method of the present invention, the second resin protective coating layer is formed to have a thickness in the range of 10 to 100 μm, so that a highly corrosive content such as a water-based aerosol product such as hair mousse can be obtained. Also, excellent corrosion resistance can be obtained.
【００４９】前記第２の樹脂保護被膜層を形成する粉体
塗料は、熱硬化性エポキシ樹脂系塗料、エポキシ・ポリ
エステル系塗料、熱可塑性ポリエステル系塗料のいずれ
か一種を用いることにより、前記第１及び第２の両樹脂
保護被覆層の間で優れた層間密着性を得ることができ
る。As the powder coating material forming the second resin protective coating layer, any one of thermosetting epoxy resin coating material, epoxy / polyester coating material and thermoplastic polyester coating material is used to obtain the first coating material. Also, excellent interlayer adhesion can be obtained between both the second resin protective coating layers.
【００５０】前記粉体塗料は平均粒子径が４０μｍ以下
であることにより、前記第２の樹脂保護被覆層を内容物
の腐食性に応じて必要且つ十分な厚さに形成することが
できる。Since the powder coating material has an average particle diameter of 40 μm or less, the second resin protective coating layer can be formed in a necessary and sufficient thickness depending on the corrosiveness of the contents.
【００５１】また、本発明の製造方法では、両端縁部に
溶接のための金属露出部を残して缶内面側に溶剤型エポ
キシ系塗料からなる下塗り層が形成されている缶胴ブラ
ンクを使用することにより、前記第２の樹脂保護被覆層
の耐蝕性をさらに向上させることができる。Further, in the manufacturing method of the present invention, a can body blank is used in which an undercoat layer made of a solvent-type epoxy paint is formed on the inner surface of the can, leaving exposed metal parts for welding at both edges. Thereby, the corrosion resistance of the second resin protective coating layer can be further improved.
【図１】本発明に係わる製造方法で得られた溶接缶体の
概念的一部断面図、FIG. 1 is a conceptual partial cross-sectional view of a welding can body obtained by a manufacturing method according to the present invention,
【図２】従来例の製造方法で得られた溶接缶体の概念的
一部断面図。FIG. 2 is a conceptual partial cross-sectional view of a welding can body obtained by a manufacturing method of a conventional example.
１、１１…缶胴、 ３、１３…溶接接合部、４、１４…
第１の樹脂保護被覆層、 ５、１５…第２の樹脂保護被
覆層、１６…下塗り層。1, 11 ... Can body, 3, 13 ... Welded joint, 4, 14 ...
First resin protective coating layer, 5, 15 ... Second resin protective coating layer, 16 ... Undercoat layer.
Claims (5)
両端縁部で重ね合わせて溶接接合して筒状の缶胴を形成
する缶胴形成工程と、該缶胴の溶接接合部の缶内面側に
第１の樹脂保護被覆層を形成して溶接接合部を被覆する
溶接接合部被覆工程と、該缶胴の缶内面側全体に粉体塗
装により第２の樹脂保護被覆層を形成して缶胴の内面を
被覆する内面被覆工程と、前記第１及び第２の両樹脂保
護被膜層を形成した缶胴の端部に缶蓋を巻締める缶蓋巻
締め工程とからなることを特徴とする溶接缶体の製造方
法。1. A can body forming step of forming a can body blank by laminating a can body blank made of a thin plate of a steel material at both end edges and welding them together, and a can inner surface of a welded joint part of the can body. Forming a first resin protective coating layer on the side to cover the welded joint portion, and forming a second resin protective coating layer on the entire inner surface of the can body by powder coating. An inner surface coating step of coating the inner surface of the can body, and a can lid winding step of winding a can lid around the end of the can body on which the first and second resin protective coating layers have been formed. A method for manufacturing a welded can body.
両端縁部で重ね合わせて溶接接合して筒状の缶胴を形成
する缶胴形成工程と、該缶胴の溶接接合部の缶内面側に
第１の樹脂保護被覆層を形成して溶接接合部を被覆する
溶接接合部被覆工程と、該缶胴の缶内面側全体に粉体塗
装により厚さ１０〜１００μｍの第２の樹脂保護被覆層
を形成して缶胴の内面を被覆する内面被覆工程と、前記
第１及び第２の両樹脂保護被膜層を形成した缶胴の端部
に缶蓋を巻締める缶蓋巻締め工程とからなることを特徴
とする溶接缶体の製造方法。2. A can body forming step of forming a tubular can body by welding and joining can body blanks made of a thin plate of steel at both end edges, and an inner surface of the can at the welded joint portion of the can body. A welded joint covering step of forming a first resin protective coating layer on the side to cover the welded joint, and a second resin protective having a thickness of 10 to 100 μm by powder coating on the entire inner surface of the can body. An inner surface coating step of forming a coating layer to cover the inner surface of the can body, and a can lid winding step of winding a can lid around the end of the can body having the first and second resin protective coating layers formed thereon. A method of manufacturing a welded can body, comprising:
塗料は、熱硬化性エポキシ樹脂系塗料、エポキシ・ポリ
エステル系塗料、熱可塑性ポリエステル系塗料のいずれ
か一種であることを特徴とする請求項１及び２記載の溶
接缶体の製造方法。3. The powder coating material forming the second resin protective coating layer is any one of a thermosetting epoxy resin coating material, an epoxy / polyester coating material, and a thermoplastic polyester coating material. The method for manufacturing a welded can body according to claim 1 or 2.
塗料は、平均粒子径が４０μｍ以下であることを特徴と
する請求項１及び２記載の溶接缶体の製造方法。4. The method for manufacturing a welded can body according to claim 1, wherein the powder coating material forming the second resin protective coating layer has an average particle diameter of 40 μm or less.
めの金属露出部を残して缶内面側に溶剤型エポキシ系塗
料からなる下塗り層が形成されていることを特徴とする
請求項１及び２記載の溶接缶体の製造方法。5. The can body blank is characterized in that an undercoat layer made of a solvent-type epoxy paint is formed on the inner surface of the can, leaving metal exposed portions for welding at both edges. 1. The method for producing a welded can body according to 1 or 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03336392A JP3298916B2 (en) | 1992-02-20 | 1992-02-20 | Manufacturing method of welding can body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03336392A JP3298916B2 (en) | 1992-02-20 | 1992-02-20 | Manufacturing method of welding can body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05228564A true JPH05228564A (en) | 1993-09-07 |
| JP3298916B2 JP3298916B2 (en) | 2002-07-08 |
Family
ID=12384506
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP03336392A Expired - Fee Related JP3298916B2 (en) | 1992-02-20 | 1992-02-20 | Manufacturing method of welding can body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3298916B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130273274A1 (en) * | 2010-12-10 | 2013-10-17 | Henkel Ag & Co. Kgaa | N-acyl amino acid as corrosion protection |
| JP2015089544A (en) * | 2013-11-07 | 2015-05-11 | 旭サナック株式会社 | Electrostatic coating method for welded metal products |
-
1992
- 1992-02-20 JP JP03336392A patent/JP3298916B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130273274A1 (en) * | 2010-12-10 | 2013-10-17 | Henkel Ag & Co. Kgaa | N-acyl amino acid as corrosion protection |
| JP2015089544A (en) * | 2013-11-07 | 2015-05-11 | 旭サナック株式会社 | Electrostatic coating method for welded metal products |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3298916B2 (en) | 2002-07-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4741934A (en) | Steel sheet for making cans, cans and a method making cans | |
| JPH0532256A (en) | Welding can body | |
| JPH05112755A (en) | Coating composition for coated metal plate for two-piece can and metal plate coated therewith | |
| JP4434562B2 (en) | Metal container with inner surface coated and method for manufacturing the same | |
| JPH05228564A (en) | Manufacture of welded can body | |
| EP0615840A1 (en) | Can covering film, can body precursor including the same and production process thereof | |
| JP2000126678A (en) | Coated metallic sheet coated with heat shieldable coating material | |
| CA1189749A (en) | Coated metal container and method of making the same | |
| JPH01214433A (en) | Aerosol containers and aerosol products | |
| JP3585958B2 (en) | Aerosol metal can body and method for producing the same | |
| JP2863389B2 (en) | Aerosol can container and aerosol can | |
| JP3926052B2 (en) | Film laminated steel sheet for 2-piece cans with excellent processing adhesion and corrosion resistance | |
| JPH0213896B2 (en) | ||
| JP3298971B2 (en) | Polyester film for coating can material and method for producing the same | |
| JP3591064B2 (en) | Metal can body | |
| JP2678498B2 (en) | Shot blasting-sensitive paint and coating method | |
| JP3791278B2 (en) | Polyester resin laminated steel sheet | |
| JPH0413144B2 (en) | ||
| JP2828648B2 (en) | Repair paint for pearl coating and its repair method | |
| JPH09290213A (en) | Metallic material surface coating film structure and its formation | |
| JPH0596627A (en) | Polyethylene terephthalate film laminated can body | |
| JP2780482B2 (en) | Topcoat with transparency | |
| JPH0542630A (en) | Film laminated steel plate for cans | |
| JPH07314069A (en) | Metal can body and manufacturing method thereof | |
| JP2000185735A (en) | Film-attached can body and method for producing the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| S111 | Request for change of ownership or part of ownership |
Free format text: JAPANESE INTERMEDIATE CODE: R313111 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Year of fee payment: 6 Free format text: PAYMENT UNTIL: 20080419 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Year of fee payment: 7 Free format text: PAYMENT UNTIL: 20090419 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100419 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110419 Year of fee payment: 9 |
|
| LAPS | Cancellation because of no payment of annual fees |