JP5588687B2 - Metal can manufacturing method and metal can - Google Patents

Metal can manufacturing method and metal can Download PDF

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JP5588687B2
JP5588687B2 JP2010013980A JP2010013980A JP5588687B2 JP 5588687 B2 JP5588687 B2 JP 5588687B2 JP 2010013980 A JP2010013980 A JP 2010013980A JP 2010013980 A JP2010013980 A JP 2010013980A JP 5588687 B2 JP5588687 B2 JP 5588687B2
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JP2011152923A (en
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優 伊多
登志之 上田
崇 澤井
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Takeuchi Press Industries Co Ltd
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本発明は、金属缶の製造方法及び金属缶に関し、さらに詳しくは、ねじ付金属缶、マキシキャップ用金属缶又はＤＩ缶等の製造工程において、揮発性有機化合物（以下「ＶＯＣ」という）の排出濃度を削減でき、かつ外面塗料の使用量の削減により、製造コストの低減化を図ることができる金属缶の製造方法及び金属缶に関する。   TECHNICAL FIELD The present invention relates to a metal can manufacturing method and a metal can, and more specifically, discharge of a volatile organic compound (hereinafter referred to as “VOC”) in a manufacturing process of a metal can with a screw, a metal can for maxi cap, or a DI can. The present invention relates to a metal can manufacturing method and a metal can that can reduce the concentration and can reduce the manufacturing cost by reducing the amount of the external coating used.

従来、金属缶用の外面塗料としては、アクリル樹脂、エポキシ樹脂又はポリエステル樹脂等を主体として、アミノ樹脂、フェノール樹脂などの硬化剤、触媒を配合した塗料が多く用いられている。又、近年キャップの再栓可能性の要求から、ねじ付金属缶が開発され市場に流出している。   2. Description of the Related Art Conventionally, as an outer surface coating material for a metal can, a coating material mainly containing an acrylic resin, an epoxy resin, a polyester resin, or the like, and a curing agent such as an amino resin or a phenol resin, and a catalyst are often used. In recent years, due to the demand for cap recapability, threaded metal cans have been developed and have been released to the market.

このようなねじ付金属缶は、例えばアルミニウム等の薄い金属板をカッピングし、さらに深絞り及びアイアニング加工した缶体に、ベースコート（加工度の高い部位には、サイズコート）が塗装され、焼付け乾燥され、その上に印刷インキにより所望の模様、文字等が印刷される。そして、その上に保護層として外面塗料が塗装される。次にネッキング加工により口部及び肩部が形成され、さらに、口部の外周にねじ加工が施されることにより、ねじ付金属缶が製造されている。この製造工程に用いられる外面塗料としては、溶剤系塗料と水性系塗料があり、例えば、溶剤系塗料の文献としては文献１があり、水性系塗料としては文献２がある。   In such a screwed metal can, for example, a thin metal plate such as aluminum is cupped, and a deep coat and ironing can body is coated with a base coat (size coat in a high degree of processing), and then dried by baking. A desired pattern, characters, or the like is printed on the printed ink. Then, an outer surface paint is applied as a protective layer thereon. Next, a mouth part and a shoulder part are formed by necking, and a threaded metal can is manufactured by further threading the outer periphery of the mouth part. As the exterior paint used in this manufacturing process, there are a solvent-based paint and a water-based paint. For example, there is Document 1 as a document of solvent-based paint, and Document 2 as a water-based paint.

特開２００６−１６４８６号公報JP 2006-16486 A 特開２００８−７６２７号公報JP 2008-7627 A

しかし、従来の溶剤系塗料を用いた金属缶の製造工程（特に乾燥工程）においては、溶剤系塗料からＶＯＣが多く発生するという欠点があり、環境問題の側面において、大きな問題となっていた。 ＶＯＣは土壌や地下水を汚染し、大気中に放出されると光化学反応によりオキシダント等の発生に関与し、大気を汚染して人体に悪影響を及ぼすことが懸念されている。近年、改正大気汚染防止法に排出基準値が規定され、企業にとっては、ＶＯＣ排出規制基準をクリアする対策を講じる必要に迫られている。そこで、従来の溶剤系塗料に代わる塗料が要求され、ＶＯＣ削減のさらなる向上が望まれていた。金属缶の製造工程において、外面印刷に使用されるインキは、すでに水性塗料が使用されているが、トップコートの外面塗料は溶剤系塗料が多く、これが金属缶の製造工程におけるＶＯＣ濃度を高くしている要因となっていた。    However, the conventional metal can manufacturing process (especially the drying process) using a solvent-based paint has a drawback that a large amount of VOC is generated from the solvent-based paint, which is a big problem in terms of environmental problems. VOCs contaminate soil and groundwater, and when released into the atmosphere, VOCs are involved in the generation of oxidants and the like by photochemical reactions, and there is a concern that the atmosphere will be contaminated and adversely affect human bodies. In recent years, emission standards have been defined in the revised Air Pollution Control Law, and companies have been forced to take measures to meet VOC emission regulation standards. Therefore, a paint that replaces the conventional solvent-based paint is required, and further improvement in VOC reduction has been desired. In the metal can manufacturing process, water-based paint is already used as the ink used for printing on the outer surface, but the topcoat outer surface paint is mostly solvent-based paint, which increases the VOC concentration in the metal can manufacturing process. It was a factor.

又外面塗装工程においては、外面塗料の薄肉化による外面塗料の使用量削減及び製造コスト低減化が要請されていた。さらに、従来ねじ付金属缶等の製造工程における加工度が高い、ネッキング工程及びねじ成形工程において、従来の水性外面塗料は、これらの成形工程において外面塗膜の亀裂や剥離対策に対して不十分であった。この発明は、このような課題に着目してなされたものであり、金属缶の製造工程において、ＶＯＣの削減を図ることができ、かつ金属缶の製造工程において、塗料の使用量を削減でき、製造コストの低減化を図ることができるとともに、加工度の高い部分に、より効果的な水性外面塗料を使用した、金属缶の製造方法及び金属缶を提供することを目的とする。   In the outer surface coating process, it has been requested to reduce the amount of outer surface paint used and the manufacturing cost by reducing the thickness of the outer surface paint. Furthermore, in the necking process and the screw forming process, which have a high degree of processing in the manufacturing process of conventional threaded metal cans, etc., conventional water-based outer surface paints are insufficient for measures against cracks and peeling of the outer surface coating film in these forming processes. Met. This invention has been made paying attention to such a problem, in the metal can manufacturing process, can reduce VOC, and in the metal can manufacturing process can reduce the amount of paint used, An object of the present invention is to provide a metal can manufacturing method and a metal can that can reduce the manufacturing cost and use a more effective water-based outer surface paint in a portion with a high degree of processing.

この課題を解決するため、請求項１記載の発明の解決手段は、薄い金属板をカッピング加工し、胴部を深絞り及びアイアニング加工し、１次洗浄・乾燥を経て、ベースコート塗料を塗装し、印刷工程、外面塗装工程を経て、ネッキング加工し、ねじ成形工程を経て、２次洗浄・乾燥が施される金属缶の製造方法において、前記外面塗装工程において、水性外面塗料が用いられ、その水性外面塗料が、不揮発分と溶剤分と水分とから構成される缶
外面用ポリエステル樹脂系水性塗料であり、前記不揮発分は、その固形分が４０〜５０重量％であり、かつ、親水性ポリエステル樹脂とアミノ樹脂系硬化剤から成り、前記溶剤分は、３０〜４０重量％であり、かつ、親水性有機溶剤から成り、前記水分は、１５〜２０重量％であり、前記金属缶の外面に塗装される水性外面塗料の塗膜量が４０〜５０ｍｇ／１００ｃｍ ２ である、ことを特徴とする金属缶の製造方法である。
In order to solve this problem, the solution of the invention described in claim 1 is that a thin metal plate is cupped, the body is deep-drawn and ironed, and after first cleaning and drying, a base coat paint is applied, printing process, through the outer surface painting process, and necking, through the screw forming process, the method of producing metal cans secondary cleaning and drying is performed, in the outer surface painting process, the aqueous outer surface coating is used, its A water-based outer surface paint consisting of non-volatile content, solvent content and moisture
It is a polyester resin-based water-based paint for external surfaces, and the non-volatile component has a solid content of 40 to 50% by weight and is composed of a hydrophilic polyester resin and an amino resin-based curing agent, and the solvent component is 30 to 40%. The water content is 15 to 20% by weight, and the coating amount of the water-based outer surface paint applied to the outer surface of the metal can is 40 to 50 mg / 100 cm 2 . It is a manufacturing method of a metal can characterized by being.

この課題を解決するため、請求項２記載の発明の解決手段は、前記缶外面用ポリエステル樹脂系水性塗料の不揮発分に、エポキシ樹脂、フェノール樹脂、レベリング剤、各種ワックス又は硬化促進剤を配合することを特徴とする金属缶の製造方法である。
To solve this problem, means for solving the problems described in claim 2, formulated in a non-volatile content of the polyester resin-based aqueous coating said can outer surface, e epoxy resin, phenol resin, leveling agent, various waxes or the curing accelerator It is the manufacturing method of the metal can characterized by performing.

この課題を解決するため、請求項３記載の発明の解決手段は、前記缶外面用ポリエステル樹脂系水性塗料の溶剤分に、炭化水素系又はエステル系の溶剤を配合することを特徴とする金属容器の製造方法である。
To solve this problem, solutions of the invention of claim 3, wherein the metal, characterized in that the solvent component of the can outer surface polyester resin for water-based paints, blending solvents charcoal hydrocarbon or ester It is a manufacturing method of a container.

この課題を解決するため、請求項４記載の発明の解決手段は、上記製造方法で製造されたことを特徴とする金属缶である。
In order to solve this problem, the solving means of the invention according to claim 4 is a metal can manufactured by the above manufacturing method.

本発明に係る金属缶の製造方法によれば、金属缶の製造工程において、ＶＯＣの大幅な削減を図ることができる効果を有する。又金属缶の製造工程において、塗料の使用量の削減により、製造コストの低減化を図ることができる効果を奏する。さらに、加工度の高い部位の製造工程において、塗膜の割れ、剥離をより効果的に防止できる。   The metal can manufacturing method according to the present invention has an effect of significantly reducing VOC in the metal can manufacturing process. Moreover, in the manufacturing process of a metal can, there exists an effect which can aim at reduction of manufacturing cost by reduction of the usage-amount of a coating material. Furthermore, it is possible to more effectively prevent cracking and peeling of the coating film in the manufacturing process of the part with a high degree of processing.

本発明に係る金属容器の製造方法において、各製造工程を示す図面。The drawing which shows each manufacturing process in the manufacturing method of the metal container which concerns on this invention. 本発明に係る金属容器の製造方法において、各製造工程を示す図面。The drawing which shows each manufacturing process in the manufacturing method of the metal container which concerns on this invention. 本発明に係る金属容器の製造方法において、ねじ成形工程を示す図面。The drawing which shows a screw forming process in the manufacturing method of the metal container which concerns on this invention. 本発明に係る金属容器の製造方法において、ネッキング加工工程、ねじ成形工程及びカール成形工程で用いられるネッキングマシンを示した側面図。The side view which showed the necking machine used at the necking process, the screw formation process, and the curl formation process in the manufacturing method of the metal container which concerns on this invention. 図５ａおよび図５ｂは、本発明に係る金属容器の製造方法で製造された金属容器の実施態様を示した正面図、図５ｃおよび図５ｄは発明の範囲外の金属容器を示す正面図である。 5a and 5b are front views showing an embodiment of a metal container manufactured by the method for manufacturing a metal container according to the present invention, and FIGS. 5c and 5d are front views showing a metal container outside the scope of the invention. .

以下、本発明の実施例の一例を図面に基づいて説明する。   Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings.

図１〜図２は、本発明の実施例１を示すねじ付金属缶の製造方法の製造工程を示した図面である。本発明に係る製造工程において使用される水性外面塗料を用いて、ねじ付金属缶を製造した場合、通常の生産条件下での外面乾燥炉排風機からの排気中におけるＶＯＣ濃度を、約３５〜４０％削減可能となる。これは、大幅に溶剤分が削減できるという利点に結び付く。又外面塗料の使用量の削減については、従来溶剤型塗料に比較して、硬化性、反応性に優れるため、途膜硬度が上昇することにより、従来より薄い塗膜でも、外面途膜の物性、実用性を満足することができる。そして、ねじ部の滑性が向上する。   1 to 2 are drawings showing manufacturing steps of a method for manufacturing a threaded metal can showing Example 1 of the present invention. When a threaded metal can is manufactured using the water-based outer surface coating material used in the manufacturing process according to the present invention, the VOC concentration in the exhaust from the outer surface drying furnace exhaust fan under normal production conditions is about 35 to 35%. 40% reduction is possible. This leads to the advantage that the solvent content can be greatly reduced. In addition, the reduction in the amount of exterior paint used is superior in curability and reactivity compared to conventional solvent-based paints, and as a result, the film hardness increases. Can satisfy the practicality. And the lubricity of a thread part improves.

又、ねじ成形性、ねじ部の滑性以外に、本発明に係る金属缶の製造方法においては、耐溶剤性、耐水性及び光沢が良好である。又従来の水性塗料と比較すると、ポリエステル樹脂の親水性向上により、高分子量化が可能であり、それに伴い加工密着性が向上する。又ポリエステル樹脂の親水性向上に伴い、逆に塗膜の耐水性が低下する傾向はあるが、アミノ樹脂比率をあげることにより塗膜の硬化性が向上した。   In addition to the screw formability and the lubricity of the threaded portion, the metal can manufacturing method according to the present invention has good solvent resistance, water resistance and gloss. Compared with conventional water-based paints, the hydrophilicity of the polyester resin can be increased so that the molecular weight can be increased. Further, the water resistance of the coating film tends to decrease with the improvement of the hydrophilicity of the polyester resin, but the curability of the coating film is improved by increasing the amino resin ratio.

本発明に係る水性外面塗料の実施例として、不揮発分と溶剤分と水分とから構成される缶外面用ポリエステル樹脂系水性塗料であって、（ａ）前記不揮発分は、固形分が４０〜５０重量％である親水性ポリエステル樹脂とアミノ樹脂系硬化剤から成り、（ｂ）前記溶剤分は、３０〜４０重量％である親水性有機溶剤から成り、（ｃ）前記水分は、１５〜２０重量％であることを特徴とする缶外面用ポリエステル樹脂系水性塗料を用いることを特徴とする金属缶の製造方法である。不揮発分は、主に親水性ポリエステル樹脂とアミノ樹脂系硬化剤から成るが、必要に応じて、エポキシ樹脂、フェノール樹脂の添加やレベリング剤や各種ワックス、硬化促進剤等の添加剤を配合することもできる。又溶剤分は、親水性有機溶剤であり、水と分離することなく混合できる有機溶剤が主成分であるが、アルコール系、ケトン系、グリコールエーテル系等、必要に応じて炭化水素系やエステル系溶剤を併用することも可能である。   As an example of the water-based outer surface paint according to the present invention, it is a polyester resin-based water-based paint for can outer surfaces composed of a non-volatile component, a solvent component, and moisture, and (a) the non-volatile component has a solid content of 40 to 50. (B) The solvent component is composed of a hydrophilic organic solvent of 30 to 40% by weight, and (c) the water content is 15 to 20% by weight. % Is a method for producing a metal can characterized by using a polyester resin-based water-based paint for the outer surface of the can. The non-volatile content mainly consists of hydrophilic polyester resin and amino resin curing agent, but if necessary, add additives such as epoxy resin, phenol resin, leveling agent, various waxes, curing accelerators, etc. You can also. The solvent component is a hydrophilic organic solvent, and the main component is an organic solvent that can be mixed without being separated from water, but alcohol-based, ketone-based, glycol ether-based, etc. It is also possible to use a solvent in combination.

次に、本発明に係る製造方法を図面に基づいて順次説明する。図１（ａ）〜（ｇ）及び図２（ｈ）〜（ｍ）は、本発明に係るねじ付金属缶の製造工程を示した図面である。まず、図１（ａ）に示すように、アルミニュウムの板材を深しぼり成形し（カッピング工程）、図１（ｂ）で、胴部を再絞り成形及び胴部にしごき加工を施し、胴部を薄くした後（アイアニング工程）、図１（ｃ）の口部先端のトリミング加工を経て（トリミング工程）、図１（ｄ）の１次洗浄・乾燥工程を経る。次に、図１（ｅ）でベースコートを塗装し（ベースコート工程）、次に図１（ｆ）の印刷を経て、その上に外面塗装が施され、その後乾燥工程を経る。さらに、図１（ｇ）の内面塗装・焼付工程を経て、図２（ｈ）の口部及び肩部の外径を絞るネッキング加工工程に入る。ネッキング加工工程では、図４に示すネッキングマシン５が用いられる。次いで、図２（ｊ）及び図３は、ねじ成形駒２を内側及び外側から金属缶１の口部２に当接して、口部２にねじ部２ａを施す工程である（ねじ成形工程）。次に、口部先端のカール成形工程及び２次洗浄・乾燥工程を経て、製品である、ねじ付金属缶１が製造される。   Next, the manufacturing method according to the present invention will be sequentially described based on the drawings. 1 (a) to 1 (g) and FIGS. 2 (h) to (m) are drawings showing a manufacturing process of a threaded metal can according to the present invention. First, as shown in FIG. 1 (a), an aluminum plate material is deep-drawn and formed (a cupping process). In FIG. 1 (b), the body is redrawn and subjected to ironing to the body. After thinning (an ironing step), the front end of the mouth shown in FIG. 1C is trimmed (trimming step), followed by a primary cleaning / drying step shown in FIG. Next, a base coat is applied in FIG. 1 (e) (base coat process), and then, after printing in FIG. 1 (f), an outer surface coating is applied thereon, followed by a drying process. Further, after the inner surface painting / baking step shown in FIG. 1 (g), a necking step for narrowing the outer diameters of the mouth and shoulders shown in FIG. 2 (h) is entered. In the necking process, a necking machine 5 shown in FIG. 4 is used. Next, FIG. 2 (j) and FIG. 3 are steps in which the screw forming piece 2 is brought into contact with the mouth portion 2 of the metal can 1 from the inner side and the outer side, and the screw portion 2a is applied to the mouth portion 2 (screw forming step). . Next, the metal can with a screw 1 which is a product is manufactured through the curl forming process and the secondary cleaning / drying process at the tip of the mouth.

具体的に個々の製造工程において、上記塗料を使用した場合の利点について説明する。次に示す製造工程においては、特に本発明の効果が顕著である。図２（ｆ）に示す印刷、外面塗装及び乾燥工程において、上記塗料を用いた場合、ＶＯＣの大幅な削減を図ることができる（表１参照）と共に、図２（ｊ）のねじ成形工程において、金属缶のねじ部の塗膜の微小な割れを防止できるので、図２（ｌ）の２次洗浄、乾燥工程において、金属缶のねじ部の塗膜の微小な割れの間に洗浄の水が入り、その後の乾燥により塗膜が剥離するのを完全に防止することができる。又、図１（ｆ）に示すように、外面塗装工程において、上記水性塗料を塗装した場合、大幅な塗料の削減を図ることができる（表２参照）。さらに、図２（ｈ）、（ｉ）のネッキング加工工程、図２（ｊ）及び図３のねじ成形工程において、従来公知の水性塗料と比較すると、本発明に係る金属缶の製造方法の製造工程に用いられる水性外面塗料は、絞り加工における塗膜の加工密着性により優れ、加工の際の塗膜の割れ、剥離が防止できる。又塗膜硬度の向上により、各工程間における搬送トラブルを減少でき、又ねじ部の滑性向上により、キャッピング後の開栓性が向上する。   Specifically, advantages of using the above-mentioned paint in each manufacturing process will be described. In the following manufacturing process, the effect of the present invention is particularly remarkable. In the printing, external coating and drying processes shown in FIG. 2 (f), when the above-mentioned paint is used, VOC can be greatly reduced (see Table 1), and in the screw forming process of FIG. 2 (j). In the secondary cleaning and drying process shown in FIG. 2 (l), cleaning water is removed during the micro cracking of the coating film on the screw part of the metal can. It is possible to completely prevent the coating film from peeling off by subsequent drying. In addition, as shown in FIG. 1 (f), when the water-based paint is applied in the outer surface painting process, the paint can be significantly reduced (see Table 2). Further, in the necking process shown in FIGS. 2 (h) and (i) and the screw forming process shown in FIGS. 2 (j) and 3, the manufacturing method of the metal can manufacturing method according to the present invention is compared with a conventionally known water-based paint. The aqueous outer surface paint used in the process is excellent in the processing adhesion of the coating film in the drawing process, and can prevent cracking and peeling of the coating film during processing. Moreover, the improvement of the coating film hardness can reduce the trouble of conveyance between the respective processes, and the improvement of the lubricity of the threaded portion improves the opening performance after capping.

図３は、図２（ｊ）ねじ成形工程を詳細に記載した図面である。図３に示すように、ねじ成形駒３を内側及び外側から、金属缶１の口部２に当接して、口部２にねじ部２ａが形成され、図４は、図２（ｈ）、（ｉ）、（ｊ）及び（ｋ）の工程で用いられるネッキングマシン４の概略図であり、図５（ａ）および図５（ｂ）は、本発明に係る金属缶の製造方法により製造される金属缶の実施態様である。図５（ａ）は、ねじ付金属缶１、図５（ｂ）は、首部にストレート部を有するねじ付金属缶１０であり、図５（ｃ）は、口部にマキシキャップが打栓される金属容器２０、図５（ｄ）は、通常のＤＩ缶３０である。 FIG. 3 is a drawing describing in detail the screw forming step of FIG. 2 (j). As shown in FIG. 3, the screw forming piece 3 is brought into contact with the mouth part 2 of the metal can 1 from the inside and the outside, and a thread part 2a is formed in the mouth part 2, and FIG. (I) It is the schematic of the necking machine 4 used at the process of (j) and (k), FIG.5 (a) and FIG.5 ( b ) are manufactured by the manufacturing method of the metal can which concerns on this invention. This is an embodiment of a metal can. 5 (a) shows a threaded metal can 1, FIG. 5 (b) shows a threaded metal can 10 having a straight part at the neck, and FIG. 5 (c) shows a maxi cap plugged at the mouth. The metal container 20 shown in FIG. 5D is a normal DI can 30.

Ａ．次に、本発明に係る金属缶の製造工程におけるＶＯＣの排出状況を、従来と比較評価した表１を以下に示す。
・水性外面塗料の組成；不揮発分：４５％、溶剤分：３５％、水分：２０％
・測定場所；本発明に係る金属缶の製造工程において、ＶＯＣの排出規制が課せられた
製造工程の外面乾燥炉排風機
・測定方法；環境省告示第６１号による方法（ピトー管法）
・分析方法；ＶＯＣ計（ＧＣ−ＦＩＤ）による方法

Figure 0005588687
上記から、水性外面塗料組成中の水分が２０％の場合、揮発分（溶剤分＋水分）中の
水分量が３６％となり、溶剤分が大幅に削減でき、又塗料使用量の削減による相乗効果により、表１に示すように、ＶＯＣの排出濃度を３８．１％削減できた。平均で３５３ｐｐｍＣであった。
Ｂ．本発明に係る金属缶の製造工程における外面塗料の使用量に関するデータを表２に示す。
・測定場所；本発明に係る金属缶の外面塗装工程
・測定方法；重量測定
Figure 0005588687
 上記から、溶剤型塗料が、概ね７０〜８０ｍｇ／１００ｃｍ２の塗膜量で塗装されるのに対して、水性外面塗料の場合は、概ね４０〜５０ｍｇ／１００ｃｍ２の塗膜量で要求物性をクリアでき、塗料使用量を１５．６％削減できた。 A. Next, Table 1 in which the VOC emission status in the manufacturing process of the metal can according to the present invention is compared and evaluated in the past is shown below.
-Composition of water-based outer coating; non-volatile content: 45%, solvent content: 35%, moisture: 20%
・ Measurement location: External drying furnace exhaust blower / measurement method of VOC emission regulations imposed in the metal can manufacturing process according to the present invention; Method according to Ministry of the Environment Notification No. 61 (Pitot tube method)
・ Analysis method: Method using VOC meter (GC-FID)
Figure 0005588687
 From the above, when the water content in the aqueous exterior paint composition is 20%, the water content in the volatile component (solvent content + water content) is 36%, so that the solvent content can be greatly reduced, and the synergistic effect by reducing the amount of paint used As shown in Table 1, the VOC emission concentration was reduced by 38.1%. The average was 353 ppmC.
B. Table 2 shows data relating to the amount of outer surface paint used in the manufacturing process of the metal can according to the present invention.
・ Measurement place: External coating process and measurement method for metal can according to the present invention;
Figure 0005588687
 From the above, solvent-based paints are generally applied with a coating amount of 70-80 mg / 100 cm2, whereas in the case of aqueous external coatings, the required physical properties can be cleared with a coating amount of 40-50 mg / 100 cm2. The amount of paint used was reduced by 15.6%.

本発明に係る金属缶の製造方法及び金属缶によれば、ＶＯＣの排出濃度を削減でき、かつ外面塗料の使用量の削減により、製造コストの低減化を図ることができるので、環境面及びコスト面において優れる。したがって、ビール、清涼飲料、健康飲料及び食品等の内容物を充填する金属缶の製造方法及び金属缶として広く利用することができる。    According to the metal can manufacturing method and the metal can according to the present invention, it is possible to reduce the VOC emission concentration and to reduce the manufacturing cost by reducing the use amount of the outer surface paint. Excellent in terms. Therefore, it can be widely used as a method for producing a metal can and a metal can filled with contents such as beer, soft drink, health drink and food.

１ 金属缶
２ 口部
３ ねじ成形駒
１０ ストレート部を有するねじ付金属缶
２０ マキシキャップが打栓される金属容器
３０ ＤＩ缶 DESCRIPTION OF SYMBOLS 1 Metal can 2 Mouth part 3 Screw forming piece 10 Metal can with a screw which has a straight part 20 Metal container 30 with which a maxi cap is stoppered DI can

Claims (4)

薄い金属板をカッピング加工し、胴部を深絞り及びアイアニング加工し、１次洗浄・乾燥を経て、ベースコート塗料を塗装し、印刷工程、外面塗装工程を経て、ネッキング加工し、ねじ成形工程を経て、２次洗浄・乾燥が施される金属缶の製造方法において、
前記外面塗装工程において、水性外面塗料が用いられ、
その水性外面塗料が、不揮発分と溶剤分と水分とから構成される缶外面用ポリエステル樹脂系水性塗料であり、
前記不揮発分は、その固形分が４０〜５０重量％であり、かつ、親水性ポリエステル樹脂とアミノ樹脂系硬化剤から成り、
前記溶剤分は、３０〜４０重量％であり、かつ、親水性有機溶剤から成り、
前記水分は、１５〜２０重量％であり、
前記金属缶の外面に塗装される水性外面塗料の塗膜量が４０〜５０ｍｇ／１００ｃｍ ２ である、ことを特徴とする金属缶の製造方法。 A thin metal plate is cupped, the body is deep-drawn and ironed, first washed and dried, then the base coat paint is applied, the printing process and the external coating process are performed, the necking process is performed, and the screw forming process is performed. in the manufacturing method of the metal can be subjected to secondary cleaning-drying,
In the outer surface painting step, a water-based outer surface paint is used ,
The water-based outer surface paint is a polyester resin-based water-based paint for a can outer surface composed of a nonvolatile content, a solvent content, and moisture,
The non-volatile component has a solid content of 40 to 50% by weight, and consists of a hydrophilic polyester resin and an amino resin curing agent,
The solvent content is 30 to 40% by weight, and consists of a hydrophilic organic solvent,
The moisture is 15 to 20% by weight,
The coating amount of the aqueous outer surface coating to be coated on the outer surface of the metal can is 40-50 mg / 100 cm 2, the production method of metal cans, characterized in that. 前記缶外面用ポリエステル樹脂系水性塗料の不揮発分に、エポキシ樹脂、フェノール樹脂、レベリング剤、各種ワックス又は硬化促進剤を配合することを特徴とする請求項１記載の金属缶の製造方法。 The nonvolatile content of the polyester resin-based aqueous coating said can outer surface, e epoxy resin, phenol resin, leveling agent, The process of claim 1 metal can, wherein the blending various waxes or hardening accelerator. 前記缶外面用ポリエステル樹脂系水性塗料の溶剤分に、炭化水素系又はエステル系の溶剤を配合することを特徴とする請求項１記載の金属容器の製造方法。 Wherein the solvent component of the polyester resin-based aqueous paint cans outer surface, the production method of the metal container according to claim 1, wherein the blending solvent charcoal hydrocarbon or ester. 請求項１〜３のいずれかに記載の製造方法で製造されたことを特徴とする金属缶。 Metal can, characterized in that it is manufactured by the manufacturing method according to any one of claims 1-3.
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