JPH06170472A - Manufacture of lid easy to open - Google Patents
Manufacture of lid easy to openInfo
- Publication number
- JPH06170472A JPH06170472A JP32970392A JP32970392A JPH06170472A JP H06170472 A JPH06170472 A JP H06170472A JP 32970392 A JP32970392 A JP 32970392A JP 32970392 A JP32970392 A JP 32970392A JP H06170472 A JPH06170472 A JP H06170472A
- Authority
- JP
- Japan
- Prior art keywords
- thickness
- guide groove
- resin film
- cutting guide
- film
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D51/00—Making hollow objects
- B21D51/16—Making hollow objects characterised by the use of the objects
- B21D51/38—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures
- B21D51/383—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures scoring lines, tear strips or pulling tabs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D51/00—Making hollow objects
- B21D51/16—Making hollow objects characterised by the use of the objects
- B21D51/38—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures
- B21D51/44—Making closures, e.g. caps
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、金属容器蓋、特に缶蓋
の一部あるいはほぼその全面を人手により容易に開口で
きる易開缶蓋に関するものであり、飲料缶あるいは一般
食缶その他の幅広い用途に使用される。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal container lid, and more particularly to an easy-open can lid which can easily open a part or almost the entire surface of a can lid manually, and can be used for a wide range of beverage cans, general food cans and the like. Used for purposes.
【０００２】[0002]
【従来の技術】容器蓋の一部あるいはほぼその全面を人
手により容易に開口できる易開缶蓋は、取っ手と開口片
を引きちぎり缶本体と分離されるテアーオフ方式と、取
っ手および開口片共に開缶後も缶本体に固着されたまま
残るステイオンタブ方式が実用化されている。いずれの
方式においても、殆どの易開缶蓋は製造技術上の理由か
らアルミニウム板で製造されており、一部の限られた用
途に鋼板が使用されている現状にある。2. Description of the Related Art An easy-opening can lid that allows a part or almost the entire surface of a container lid to be opened easily by hand is a tear-off system in which the handle and the opening piece are torn off and the can body is separated, and both the handle and the opening piece are opened. The Steintab method, which remains fixed to the can body even after the can is put into practical use, has been put into practical use. In any of the methods, most of the easy-open can lids are manufactured from aluminum plates for the reasons of manufacturing technology, and steel plates are currently used for some limited purposes.
【０００３】従来技術の代表例としては、塗装されたア
ルミニウム板あるいは鋼板を素材とし、基本的な蓋形状
に打抜き後、蓋本体を平らな下型上にのせ、その上面よ
り所要の輪郭形状を有する尖鋭刃を押圧して、その刃先
を蓋本体内へ食い込ませることにより、図６に示すよう
に断面Ｖ字形の切断案内溝で囲まれる開口片形状を形成
していた。As a typical example of the prior art, a coated aluminum plate or steel plate is used as a material, and after punching into a basic lid shape, the lid body is placed on a flat lower die, and a desired contour shape is formed from the upper surface thereof. By pressing the sharp blade which it has and making its blade bite into the lid main body, an opening piece shape surrounded by a cutting guide groove having a V-shaped cross section was formed as shown in FIG.
【０００４】切断案内溝の形成に関しては、加工前の板
厚の半分〜２／３程度に達する尖鋭刃の激しい押圧が必
要であり、かつこの切断案内溝の深さが非常に重要とな
る。即ち、切断案内溝の深さが、浅すぎる場合には開缶
性不良、深すぎる場合には外部よりのショックに対する
衝撃強度不足等をもたらすため、相当の精度が必要とさ
れていた。With respect to the formation of the cutting guide groove, it is necessary to violently press the sharp blade up to about half to 2/3 of the plate thickness before processing, and the depth of the cutting guide groove is very important. That is, when the depth of the cutting guide groove is too shallow, the can openability is poor, and when the depth is too deep, the impact strength against shock from the outside is insufficient, so that considerable accuracy is required.
【０００５】従って、加工用工具にも相当の精度が要求
されるが、尖鋭刃の激しい押圧が必要であるため、工具
寿命が問題とされる。特に鋼板においては、工具寿命が
保たない欠点があった。又、内容物に対する耐食性の確
保あるいは外面錆の発生防止のため、切断案内溝部の加
工により金属面が露出した部分には補修塗装が必要とさ
れている。Therefore, the machining tool is required to have a considerable degree of accuracy, but the tool life is a problem because the sharp blade is required to press hard. Particularly in the case of steel plates, there is a drawback that the tool life cannot be maintained. Further, in order to secure the corrosion resistance to the contents or prevent the rusting of the outer surface, it is necessary to carry out repair coating on the portion where the metal surface is exposed by the processing of the cutting guide groove.
【０００６】工具寿命の延長対策としては、特開昭５５
−７０４３４号、特開昭５７−１７５０３４号等に見ら
れるごとく、複合押出し成形により切断案内溝を構成す
る方法が提案されている。この公知の方法は、鋼板の使
用を前提としてなされたものであり、工具寿命の延長に
は有効な方策であったが、切断案内溝部の断面構造が複
雑なため、通常のスプレー塗装法では切断案内溝内の全
ての部位に塗料が行き渡らず、補修塗装を行っても十分
な耐食性が得られない欠点があった。As a measure for extending the tool life, Japanese Patent Laid-Open No. Sho 55 has been proposed.
As disclosed in JP-A-70434 and JP-A-57-175034, a method of forming a cutting guide groove by composite extrusion molding has been proposed. This known method was premised on the use of steel plates, and was an effective measure for extending the tool life, but the cross-sectional structure of the cutting guide groove part is complicated, so cutting with ordinary spray painting methods There was a drawback that the paint did not spread to all parts in the guide groove, and sufficient corrosion resistance could not be obtained even if repair painting was performed.
【０００７】[0007]
【発明が解決しようとする課題】上述のごとく、易開缶
性蓋は、素材として、アルミニウム板、鋼板いずれを用
いる場合にも、予め塗装を行ったものを使用する。更
に、加工後には、加工により金属面が露出した部分に補
修塗装を行う必要がある。As described above, the easily openable lid, which is preliminarily coated regardless of whether an aluminum plate or a steel plate is used as the material, is used. Furthermore, after processing, it is necessary to perform repair coating on the portion where the metal surface is exposed by processing.
【０００８】塗装を行うことは、焼付け工程が煩雑であ
るばかりでなく、焼付けのため長時間の加熱が必要であ
り、焼付け工程中で塗料中に含まれる多量の溶剤が排出
されるため、公害面から排出溶剤を特別な焼却炉で焼却
しなければならないという問題点を有している。さら
に、塗装焼付けにおける加熱、溶剤の焼却は、二酸化炭
素を排出させるために、地球環境上からも問題である。[0008] The coating is not only complicated in the baking process, but also requires a long heating for baking, and a large amount of solvent contained in the paint is discharged during the baking process, which causes pollution. In view of this, there is a problem that the discharged solvent must be incinerated in a special incinerator. Further, heating in coating baking and incineration of solvent cause carbon dioxide emission, which is a problem from the global environment.
【０００９】さらに、リサイクル過程において以下の大
きな問題点がある。現行の易開缶性蓋用の素材である、
アルミニウム、鋼板のいずれにおいても、塗料として塩
化ビニル系塗料特に塩化ビニルオルガノゾルが、塗膜の
加工性、耐食性、内容物風味の保持性、価格の点で優れ
ることから幅広く使用されている。しかも、塩化ビニル
系塗料からなる塗膜は加熱燃焼によって、非常に有毒な
ダイオキシンを発生する。従って、現行、塩化ビニル系
塗料を使用した易開缶性蓋においては、使用済みの金属
缶体を回収して、焼却あるいは再溶融する際のダイオキ
シン発生をも考慮しなければならない。現在、塩化ビニ
ル系塗料にとって代わる塗料の研究開発も鋭意進められ
ているようだが、幅広い範囲の内容物に対して使用でき
る有望なものはない。Further, there are the following major problems in the recycling process. The material for the current easy-open can lid,
Vinyl chloride-based paints, particularly vinyl chloride organosols, are widely used as paints on aluminum and steel sheets because of their excellent processability, corrosion resistance of the coating film, retention of the flavor of the contents, and price. Moreover, a coating film made of a vinyl chloride-based paint produces extremely toxic dioxins when heated and burned. Therefore, it is necessary to consider the generation of dioxins when the used metal can body is recovered and incinerated or re-melted in the case of the easily openable lid using the vinyl chloride-based paint. At present, it seems that research and development of paints to replace vinyl chloride-based paints are also being made earnestly, but there is no promising one that can be used for a wide range of contents.
【００１０】また、リサイクルに関して、金属缶におい
ても、缶胴と缶蓋が同一素材より形成された、いわゆる
“モノメタル缶”がリサイクルに適した商品といえる
が、これに対して、現在の易開缶蓋はほとんどがアルミ
ニウム製である。一方、缶胴および易開缶蓋を除く缶蓋
はほとんどが鋼板製である。このため、開缶性に優れ、
塗装が一切不要で、耐食性の優れた、アルミニウム製易
開缶蓋に限らず鋼板製易開缶蓋をも、生産性良く製造可
能な方策の出現が熱望されている所である。Regarding metal recycling, in the case of metal cans, so-called "monometal cans", in which the can body and the can lid are made of the same material, are suitable products for recycling. Most of the open can lids are made of aluminum. On the other hand, most of the can lids except the can body and the easy-open can lid are made of steel plate. Therefore, it has excellent openability,
It is eagerly desired to develop a method that can manufacture not only aluminum easy-opening can lids, which have no need of painting at all, and have excellent corrosion resistance, but also steel plate easy-opening can lids with high productivity.
【００１１】[0011]
【課題を解決するための手段】本発明は、以上の課題を
解決するためになされたものであり、開口片形状を構成
する切断案内溝形成上下金型の肩半径が、０．１〜１．
０ｍｍである金型を用い、上下金型の該肩半径部分に
て、厚さ１０〜１００μ、破断伸び１００％以上の樹脂
皮膜を両面に有する鋼板あるいはアルミニウム板を押圧
加工成形し、加工による最薄部の金属厚みを加工前の金
属厚みの１／２以下に薄くすることにより切断案内溝を
形成することを特徴とし、さらに、使用する鋼板あるい
はアルミニウム板の両面に存在する樹脂皮膜が、ポリエ
チレン、ポリプロピレン、ポリエステル、アイオノマー
等の熱可塑性樹脂の１種または２種以上から構成される
ことを特徴とする易開缶性蓋の製造方法である。The present invention has been made to solve the above problems, and the shoulder radii of the upper and lower molds for forming the cutting guide groove forming the opening piece shape are 0.1 to 1. ．
Using a mold of 0 mm, press-molding a steel plate or an aluminum plate having a resin film having a thickness of 10 to 100 μ and a breaking elongation of 100% or more on both sides at the shoulder radius portions of the upper and lower molds, The cutting guide groove is formed by reducing the metal thickness of the thin portion to 1/2 or less of the metal thickness before processing. Furthermore, the resin coating present on both sides of the steel plate or aluminum plate used is polyethylene. And a thermoplastic resin such as polypropylene, polyester, or ionomer, or a combination of two or more of them.
【００１２】以下に本発明を詳細に説明する。本発明は
素材と加工方法とを組み合わせることにより達成される
発明である。先ず素材について説明する。The present invention will be described in detail below. The present invention is an invention achieved by combining a material and a processing method. First, the material will be described.
【００１３】本発明に使用される鋼板は、通常、板厚ｔ
0 ：０．１５０〜０．３００ｍｍの範囲にあり、硬度
（ＨR30T）５４〜６８、伸び：１０〜４０％程度の機械
的性質を有するものが使用される。The steel plate used in the present invention usually has a plate thickness t.
A material having a mechanical property of 0 : 0.150 to 0.300 mm, hardness ( HR30T ) of 54 to 68 and elongation of 10 to 40% is used.
【００１４】この鋼板の表面に、Ｓｎ，Ｃｒ，Ｎｉ，Ａ
ｌ，Ｚｎの１種または２種以上の金属のめっきを行い
し、クロメート処理皮膜の上に、製蓋加工後の補修塗装
を不要にするために密着性・加工性・耐食性に優れる樹
脂皮膜が積層される。On the surface of this steel sheet, Sn, Cr, Ni, A
A resin film with excellent adhesion, processability, and corrosion resistance is applied on the chromate-treated film by plating 1 or 2 or more metals (l, Zn) and eliminating the need for repair coating after lid manufacturing. Stacked.
【００１５】具体的に用いられる鋼板としては、付着量
０．５〜３．０ｇ／ｍ2 の錫めっき後化成処理を施した
錫めっき鋼板、付着量０．３〜２．０ｇ／ｍ2 のニッケ
ルめっき後化成処理を施したニッケルめっき鋼板、Ｓｎ
及びＮｉ付着量として各々０．５〜２．０ｇ／ｍ2 、
０．０１〜０．５ｇ／ｍ2 をＮｉ、Ｓｎの順にめっき後
化成処理を施したＳｎ／Ｎｉめっき鋼板、金属Ｃｒ付着
量５０〜２００ｍｇ／ｍ2 、酸化Ｃｒ５〜３０ｍｇ／ｍ
2 の通常ＴＦＳ（Ｔｉｎ Ｆｒｅｅ Ｓｔｅｅｌ）と呼
ばれているクロム・クロメート処理鋼板などがある。Examples of the steel sheet to be used specifically, the adhesion amount of 0.5 to 3.0 g / m 2 tin-plated steel sheet after subjected to chemical conversion treatment tin plating, the coating weight 0.3 to 2.0 g / m 2 Nickel-plated steel sheet that has undergone chemical conversion treatment after nickel plating, Sn
And 0.5 to 2.0 g / m 2 as the amount of Ni deposited,
0.01 to 0.5 g / m 2 of Ni, Sn / Ni plated steel sheet plated after chemical conversion treatment in the order of Sn, a metal Cr deposition amount 50-200 mg / m 2, oxide Cr5~30mg / m
2 There is a chrome / chromate treated steel plate which is usually called TFS (Tin Free Steel).
【００１６】また、本発明に使用されるアルミニウム板
は、通常、板厚ｔ0 ：０．１５０〜０．３００ｍｍの範
囲にあり、伸び：５〜３０％程度の機械的性質を有する
ものが使用される。The aluminum plate used in the present invention is usually one having a plate thickness t 0 of 0.150 to 0.300 mm and an elongation of about 5 to 30%. To be done.
【００１７】この、アルミニウム板に、電解クロム酸処
理、浸漬クロム酸処理を施し、クロメート処理皮膜の上
に、製蓋加工後の補修塗装を不要にするために密着性・
加工性・耐食性に優れる樹脂皮膜が積層される。クロム
付着量は酸化Ｃｒ３〜５０ｍｇ／ｍ2 の範囲が好まし
く、さらに好ましくは５〜３０ｍｇ／ｍ2 である。金属
クロム量は１０〜２００ｍｇ／ｍ2 の範囲にあることが
好ましい。This aluminum plate is subjected to electrolytic chromic acid treatment and immersion chromic acid treatment, and the chromate treatment film is adhered to the chromate-treated film to eliminate the need for repair coating after the lid-making process.
A resin film with excellent workability and corrosion resistance is laminated. The amount of deposited chromium is preferably in the range of 3 to 50 mg / m 2 of Cr oxide, and more preferably 5 to 30 mg / m 2 . The amount of metallic chromium is preferably in the range of 10 to 200 mg / m 2 .
【００１８】上述の鋼板あるいはアルミニウム板の両面
に積層される樹脂は、破断伸び１００％以上、厚み１０
〜１００μが必要である。この樹脂皮膜は、押圧成形に
よる切断案内溝の加工時に、密着性よく素地に追随し皮
膜自体も優れた加工性を有することにより、加工後も素
地を完全に被覆しており、従来必要であった補修塗装を
不要とする重要な存在である。The resin laminated on both sides of the above steel plate or aluminum plate has a breaking elongation of 100% or more and a thickness of 10%.
~ 100μ is required. This resin film completely adheres to the base material even after the processing because it adheres well to the base material and has excellent workability when the cutting guide groove is processed by pressure molding, and it is not necessary until now. It is an important entity that does not require repair painting.
【００１９】樹脂皮膜物性として、破断伸びが１００％
未満では、後述する押圧加工時の薄肉部成形に対し伸び
不足により、樹脂皮膜に多数の欠陥を生じることになり
好ましくない。従って、１００％を下限とする。好まし
くは２００％以上であることが好ましい。なお、積層樹
脂皮膜の伸び特性は、素地より樹脂皮膜を剥離し、ＪＩ
Ｓ Ｃ２３１８に準じた方法で測定される値を採用す
る。As the physical properties of the resin film, the elongation at break is 100%.
When it is less than the above range, a large number of defects are caused in the resin film due to insufficient elongation in forming a thin portion at the time of pressing, which is not preferable. Therefore, the lower limit is 100%. It is preferably 200% or more. In addition, the elongation property of the laminated resin film is determined by peeling the resin film from the base material,
The value measured by the method according to S C2318 is adopted.
【００２０】積層される樹脂皮膜厚みは薄すぎる場合に
は加工により皮膜の破断を生じ易く、逆に、６０μ超、
特に８０μ以上の皮膜になった場合、加工後の耐食性は
より良い方向に進むが、切断案内溝を破断する場合（開
缶時）に、破断までの間に膜が長く伸び、膜残り現象
（フェザー）を生じ易いため過度に厚い皮膜を採用する
ことは不利となる。従って、１０〜１００μの範囲内と
する。性能の安定性・経済性等を考慮した場合、１６〜
６０μ範囲のものが特に有効である。If the thickness of the resin film to be laminated is too thin, the film is likely to be broken by processing, and conversely, if it exceeds 60 μ,
In particular, when the film has a thickness of 80 μm or more, the corrosion resistance after working progresses in a better direction, but when the cutting guide groove is broken (when the can is opened), the film stretches for a long time before breaking, and a film residual phenomenon ( It is disadvantageous to use an excessively thick film because it easily causes feathers. Therefore, it is within the range of 10 to 100 μ. When considering the stability of the performance and economy, 16-
The range of 60μ is particularly effective.
【００２１】本発明において、食品衛生性、耐食性、加
工性等の性能から、ポリエチレン、ポリプロピレン、ポ
リエステル、ポリアミド、アイオノマー等の熱可塑性樹
脂の１種または２種以上から構成される樹脂フィルムを
用いる。上述の樹脂について、いくつか以下に補足説明
する。In the present invention, a resin film made of one or more thermoplastic resins such as polyethylene, polypropylene, polyester, polyamide, and ionomer is used in view of performances such as food hygiene, corrosion resistance and processability. Some of the above resins will be supplementarily described below.
【００２２】本発明でのポリエステル樹脂とは、ジカル
ボン酸とジオールの縮重合で得られる線状熱可塑性ポリ
エステルであり、ポリエチレンテレフタレートで代表さ
れるものである。ジカルボン酸成分としては、テレフタ
ル酸、イソフタル酸、フタル酸、アジピン酸、セバチン
酸、アゼライン酸、２，６−ナフタレンジカルボン酸、
デカンジカルボン酸、ドデカンジカルボン酸、シクロヘ
キサンジカルボン酸などの単独または混合物であり、ジ
オール成分としては、エチレングリコール、ブタンジオ
ール、デカンジオール、ヘキサンジオール、シクロヘキ
サンジオール、ネオペンチルグリコールなどの単独ある
いは混合物である。２種以上のジカルボン酸成分やジオ
ール成分による共重合体や、ジエチレングリコール、ト
リエチレングリコールなどの他のモノマーやポリマーと
の共重合体であっても良い。The polyester resin in the present invention is a linear thermoplastic polyester obtained by polycondensation of dicarboxylic acid and diol, and is represented by polyethylene terephthalate. Examples of the dicarboxylic acid component include terephthalic acid, isophthalic acid, phthalic acid, adipic acid, sebacic acid, azelaic acid, 2,6-naphthalenedicarboxylic acid,
Decanedicarboxylic acid, dodecanedicarboxylic acid, cyclohexanedicarboxylic acid, etc. may be used alone or as a mixture, and as the diol component, ethylene glycol, butanediol, decanediol, hexanediol, cyclohexanediol, neopentyl glycol, etc. may be used alone or as a mixture. It may be a copolymer of two or more kinds of dicarboxylic acid components or diol components, or a copolymer with another monomer or polymer such as diethylene glycol or triethylene glycol.
【００２３】ポリアミド樹脂は、ナイロン６，ナイロン
７，ナイロン１１，ナイロン６６，ナイロン６１０，ナ
イロン６１２，ポリｍ−フェニレンイソフタルアミドな
どの単独または混合物である。The polyamide resin is nylon 6, nylon 7, nylon 11, nylon 66, nylon 610, nylon 612, polym-phenylene isophthalamide, etc., alone or in a mixture.
【００２４】アイオノマー樹脂は、α−オレフィンと不
飽和カルボン酸との共重合体を金属イオンで分子鎖間を
架橋した樹脂であり、α−オレフィン成分としてはエチ
レン、プロピレン、ブテン、ペンテンなどの単独または
混合物であり、不飽和カルボン酸としてはアクリル酸、
メタクリル酸などの単独または混合物であり、金属イオ
ン成分としては、ナトリウム、亜鉛などの単独または混
合物である。The ionomer resin is a resin in which a copolymer of α-olefin and an unsaturated carboxylic acid is crosslinked between the molecular chains with a metal ion, and the α-olefin component is ethylene, propylene, butene, pentene or the like alone. Or a mixture, the unsaturated carboxylic acid is acrylic acid,
Methacrylic acid or the like is used alone or as a mixture, and the metal ion component is sodium or zinc or the like as a single or mixture.
【００２５】さらに、本発明で使用される樹脂フィルム
には、必要に応じ、可塑剤・酸化防止剤・熱安定剤・無
機粒子・顔料・有機滑剤などの添加剤を配合することが
行われる。Further, if necessary, the resin film used in the present invention may be mixed with additives such as a plasticizer, an antioxidant, a heat stabilizer, inorganic particles, a pigment and an organic lubricant.
【００２６】なお、樹脂フィルムは、フィルム自体を熱
接着するか、熱硬化型接着剤を塗布して前述せる金属板
両面に積層される。The resin film is laminated on both sides of the metal plate by heat-adhering the film itself or applying a thermosetting adhesive.
【００２７】次に、加工方法について説明する。従来技
術である尖鋭刃の押圧方式による図６のような切断案内
溝の形成は、樹脂皮膜を破断させ成形後の補修塗装を必
要とするため好ましくない。Next, the processing method will be described. Forming a cutting guide groove as shown in FIG. 6 by a pressing method of a sharp blade, which is a conventional technique, is not preferable because it requires breakage of the resin film and repair coating after molding.
【００２８】本発明者らは、樹脂皮膜を破断させること
なく易開缶性を保障する切断案内溝を形成する加工方法
として、開口片形状を構成する切断案内溝形成用上下金
型の肩半径が、０．１〜１．０ｍｍである金型を用い、
図２に示すように上下金型の該肩半径部分にて、上述の
両面を樹脂被覆された鋼板あるいはアルミニウム板を押
圧加工成形し、加工最薄部の金属厚みを加工前の金属厚
みの１／２以下に薄くすることにより切断案内溝を形成
する方法が最適であることを見いだしたのである。As a processing method for forming a cutting guide groove that ensures easy opening without breaking the resin film, the present inventors have established a shoulder radius of the upper and lower molds for forming the cutting guide groove forming an opening piece shape. , Using a mold of 0.1 to 1.0 mm,
As shown in FIG. 2, at the shoulder radius portions of the upper and lower dies, the above-mentioned resin-coated steel plate or aluminum plate is press-formed, and the metal thickness of the thinnest part is set to 1 mm of the metal thickness before processing. It has been found that the method of forming the cutting guide groove by thinning the thickness to 1/2 or less is optimal.
【００２９】切断案内溝形成用上下金型の肩半径を、
０．１〜１．０ｍｍとした理由について述べる。肩半径
０．１ｍｍより小さい場合には、肩半径の部分が鋭いた
めに加工時に被加工素材のラミネート樹脂皮膜を疵付け
たりあるいは破断してしまう。また、１．０ｍｍ超の条
件で押圧加工を行うと、素材は、幅広い部分で押圧され
る。この押圧部分においては、加工により金属と樹脂と
の密着性が悪くなる。必要以上に密着不良部分を形成す
る事は、フェザーを招く原因となる。また、塗膜の密着
不良部は耐食性の面からも好ましくない。The shoulder radii of the upper and lower molds for forming the cutting guide groove are
The reason for setting 0.1 to 1.0 mm will be described. When the shoulder radius is smaller than 0.1 mm, the portion of the shoulder radius is sharp, so that the laminating resin film of the material to be processed is flawed or broken during processing. Further, when the pressing process is performed under the condition of more than 1.0 mm, the material is pressed in a wide area. At this pressed portion, the adhesion between the metal and the resin deteriorates due to the processing. Forming a poor adhesion portion more than necessary causes feathers. Further, the poor adhesion portion of the coating film is not preferable in terms of corrosion resistance.
【００３０】加工の際、開口片周縁部は、望みの厚みに
到達するように上下金型の間にて押圧され、なだらかに
板厚変化した薄肉部を形成することとなる。最薄部金属
厚みは、開缶性の面より加工前の金属厚みの１／２以
下、更に望ましくは１／３以下とする必要がある。At the time of processing, the peripheral edge of the opening piece is pressed between the upper and lower molds so as to reach the desired thickness, thereby forming a thin-walled portion having a gradual plate thickness change. The metal thickness of the thinnest part needs to be ½ or less, more preferably ⅓ or less of the metal thickness before processing from the viewpoint of can openability.
【００３１】この加工により、開缶時の破断位置は確定
されるが、開缶性の向上および開缶後の開口部の形状を
望ましいものとするため、上方あるいは下方に押出され
た開口片部を以前のレベルに近いところまで押戻し加工
を行う。押戻し加工に関しては、さまざま加工法があ
る。その一例としては、図３に示すように前記の押圧加
工により形成されたなだらかな板厚変化を有する薄肉部
を、断面Ｖ字状に折曲げ薄肉の切断案内溝を形成させる
方法がある。さらには、前記の押圧加工により形成され
たなだらかな板厚変化を有する薄肉部の近傍にビード或
いは段差を入れることによって開口部の形状を望ましい
ものとする方法がある。By this processing, the breaking position at the time of opening the can is determined, but in order to improve the can opening property and to make the shape of the opening after the opening desirable, the opening piece portion extruded upward or downward is formed. Push back to near the previous level. There are various processing methods for pushback processing. As an example, as shown in FIG. 3, there is a method of forming a thin cutting guide groove by bending a thin portion formed by the pressing process and having a smooth plate thickness change into a V-shaped cross section. Furthermore, there is a method in which the shape of the opening is made desirable by forming a bead or a step in the vicinity of the thin portion having the gentle plate thickness change formed by the pressing process.
【００３２】この切断案内溝の、深さあるいは最薄部板
厚等は、加工条件を所要に設定することにより、材料の
加工性に応じた所望の値とすることが可能であり、素地
金属板およびラミネート皮膜の加工性に応じて加工条件
が選定される。The depth or the thinnest plate thickness of the cutting guide groove can be set to a desired value according to the workability of the material by setting the working conditions as required. Processing conditions are selected according to the workability of the plate and the laminate film.
【００３３】これらの一連の加工工程において、前記特
性を有する樹脂皮膜は素地と共に均一に伸ばされ、全く
加工欠陥が発生しないため、加工後の補修塗装の必要は
なく、良好な耐食性を保障することができる。また、本
発明の方法によれば、互いに凸の滑らかな曲面を有する
肩半径部分による押出しあるいは押戻し等のプレス加工
を基本とした加工であるため、尖鋭刃の押圧方式に見ら
れる工具寿命の問題は皆無であり、優れた生産性が保障
される。In these series of processing steps, the resin film having the above-mentioned characteristics is uniformly stretched together with the base material, and no processing defects occur. Therefore, repair coating after processing is not required and good corrosion resistance is ensured. You can Further, according to the method of the present invention, since the processing is basically based on press working such as extrusion or pushback with shoulder radius portions having mutually convex smooth curved surfaces, the tool life of the sharp blade pressing method can be shortened. There are no problems, and excellent productivity is guaranteed.
【００３４】本発明は開口片の周縁部に存在する切断案
内溝の最適化を主な特徴とするものであり、取っ手と開
口片を引きちぎり缶本体と分離されるテアーオフ方式
と、取っ手および開口片共に開缶後も缶本体に固着され
たまま残るステイオンタブ方式の両方式に適用すること
が可能である。The present invention is mainly characterized by optimizing the cutting guide groove existing in the peripheral portion of the opening piece. A tear-off system in which the handle and the opening piece are torn off to separate the main body from the can, and a handle and the opening. It is possible to apply both of the Stein-tab type methods in which both pieces remain fixed to the can body after opening the can.
【００３５】[0035]
【実施例】以下、本発明の実施例を示す。EXAMPLES Examples of the present invention will be shown below.
【００３６】実施例１ 板厚０．２５０ｍｍ、硬度６２（ＨR30-T ）の薄鋼板の
表面に、付着量２．８ｇ／ｍ2 の電気錫めっきを施し
た。錫を加熱・溶融し、鏡面光沢を有する表面とした
後、クロム酸を主体とする処理浴中にて電解後処理を行
い、金属クロム１２ｍｇ／ｍ2 およびその上層に水和酸
化クロム１２ｍｇ／ｍ2 （Ｃｒとして）を有するクロメ
ート皮膜を形成させた。水洗・乾燥後、この鋼板を加熱
し、異なった融点を有する２層構造ポリエステル樹脂
で、上層が厚み３７μ、下層が厚み３μで、下層樹脂は
上層樹脂より低融点でアイオノマーを含有する全厚み４
０μの樹脂フィルムを該鋼板の両面に積層した。積層後
に剥離して測定した皮膜の伸びは４５０％であった。Example 1 The surface of a thin steel plate having a plate thickness of 0.250 mm and a hardness of 62 (H R30-T ) was electrotin plated with an adhesion amount of 2.8 g / m 2 . After tin is heated and melted to make it a surface having a specular gloss, electrolytic post-treatment is carried out in a treatment bath mainly containing chromic acid to obtain 12 mg / m 2 of metallic chromium and 12 mg / m 2 of hydrated chromium oxide on the upper layer. A chromate film with 2 (as Cr) was formed. After washing with water and drying, the steel sheet is heated to a two-layer structure polyester resin having different melting points. The upper layer has a thickness of 37μ, the lower layer has a thickness of 3μ, and the lower layer resin has a lower melting point than the upper layer resin and the total thickness is 4 including ionomer.
A resin film of 0 μ was laminated on both sides of the steel plate. The elongation of the film measured after peeling after lamination was 450%.
【００３７】この両面にポリエステル樹脂皮膜を有する
鋼板を、図１に示すような易開缶蓋を作成するに当た
り、図２に示すように、開口片の形状寸法と対応し、肩
半径が０．５ｍｍである上下金型Ａ５，６をもって蓋本
体の要所をプレスによって押圧加工することにより、開
口片２に相当する部分を上方に押出し成形した。When a steel plate having a polyester resin coating on both sides thereof is used to form an easy-open can lid as shown in FIG. 1, as shown in FIG. 2, the shoulder radius corresponds to 0. A portion corresponding to the opening piece 2 was extruded upward by pressing a key portion of the lid main body with a press using upper and lower dies A5 and A6 having a size of 5 mm.
【００３８】この際、開口片２と蓋本体１とを結ぶ連片
７は、押圧によりなだらかな板厚変化を有する薄肉部を
形成するように加工した。At this time, the connecting piece 7 connecting the opening piece 2 and the lid main body 1 was processed so as to form a thin portion having a smooth plate thickness change by pressing.
【００３９】次いで図３に示すように、加工された蓋主
体１を凸部１３を有する下金型Ｂ１１上へ、連片７と凸
部１３が重なるように載せ、凹溝１２を有する上型Ｂ１
０で押圧した。Next, as shown in FIG. 3, the processed lid main body 1 is placed on the lower die B11 having the convex portion 13 so that the connecting piece 7 and the convex portion 13 are overlapped with each other, and the upper die having the concave groove 12 is formed. B1
Pressed at 0.
【００４０】この操作により、図４に示すようになだら
かな板厚変化を有する連片７は、概ね中間部からＶ字状
に下向きに折られて、凹溝１２内へ突入する。かくし
て、蓋本体１の下面における開口片２の周縁には、断面
Ｖ字状をなす薄肉の切断案内線４が形成される。By this operation, the connecting piece 7 having a gradual change in plate thickness as shown in FIG. 4 is bent downward in a V-shape from approximately the middle portion and protrudes into the concave groove 12. Thus, a thin cutting guide wire 4 having a V-shaped cross section is formed at the peripheral edge of the opening piece 2 on the lower surface of the lid body 1.
【００４１】本実施例における最薄部の鋼板厚みは４８
μであった。樹脂皮膜も鋼板同様に成形され、最薄肉部
表面に残留した膜厚は両面とも約８μであった。In the present embodiment, the thinnest portion has a steel plate thickness of 48.
It was μ. The resin film was also formed similarly to the steel plate, and the film thickness remaining on the surface of the thinnest part was about 8 μm on both surfaces.
【００４２】このようにして成形加工された易開缶蓋
は、開口片の引きちぎり力の測定による開缶性の評価
と、缶内外面の樹脂皮膜の破壊程度を調べる通電試験に
供された。開缶性（取っ手を引起こす力および開口片を
引きちぎる力）は１．７ｋｇ以下と優れ、樹脂皮膜の通
電値は内面側０．３ｍＡ、外面側０．４ｍＡで実用的に
十分満足出来るものであった。又、破断された切断案内
溝の切り口周辺には肉眼的に目立ったフェザーは認めら
れなかった。The easy-open can lid thus molded and processed was subjected to an evaluation of the can openability by measuring the tearing force of the opening piece, and an electric test for examining the degree of destruction of the resin film on the inner and outer surfaces of the can. . The can openability (the force to pull up the handle and the force to tear off the opening piece) is excellent at 1.7 kg or less, and the energization value of the resin film is 0.3 mA on the inner surface side and 0.4 mA on the outer surface side, which is sufficiently satisfactory for practical use. there were. Further, no visually noticeable feather was observed around the cut end of the broken cutting guide groove.
【００４３】実施例２ 実施例１と同一のめっき鋼板上に、５０μの変性ポリプ
ロピレン−ポリエチレン共重合樹脂フィルムを接着層と
して２０μのナイロン６フィルムを鋼板両面に積層し
た。樹脂皮膜の厚みは７０μであった。積層後に剥離し
て測定した皮膜の伸びは３５０％であった。Example 2 On the same plated steel plate as in Example 1, 20 μm nylon 6 film was laminated on both sides of the steel plate with a 50 μm modified polypropylene-polyethylene copolymer resin film as an adhesive layer. The thickness of the resin film was 70μ. The elongation of the film measured after peeling after lamination was 350%.
【００４４】この両面に樹脂皮膜を有する鋼板を、肩半
径が０．２ｍｍである上下金型Ａ５，６を用いて、図２
に示すように、押圧加工することにより、開口片２に相
当する部分を上方に押出し成形した。This steel sheet having a resin coating on both sides was prepared by using upper and lower dies A5 and A6 having a shoulder radius of 0.2 mm as shown in FIG.
As shown in, by pressing, a portion corresponding to the opening piece 2 was extruded upward.
【００４５】この際、開口片２の周縁部と蓋本体１と連
片７は、押圧によりなだらかな板厚変化を有する薄肉部
を形成するように加工した。At this time, the peripheral portion of the opening piece 2, the lid main body 1 and the connecting piece 7 were processed so as to form a thin portion having a smooth change in plate thickness by pressing.
【００４６】次いで図５に示すように、開口片２の連片
７の両側に相当する部分に凸部１８を有する下型Ｃ１５
上へ、蓋本体１を下向拡開傾斜の状態のまま載せ、下金
型Ｃ１５の凸部１８に対応する凹部１７を有する上型Ｃ
１４で押圧した。Next, as shown in FIG. 5, a lower mold C15 having convex portions 18 at portions corresponding to both sides of the connecting piece 7 of the opening piece 2.
An upper die C having the lid body 1 placed thereon in the state of downwardly expanding and sloping and having a concave portion 17 corresponding to the convex portion 18 of the lower die C15.
Pressed with 14.
【００４７】この操作により、開口案内溝の内側と外側
にビードを形成し、このビード部を除いて蓋本体１と開
口片２が同一高さとなった。本体１の上面における開口
片２の周縁には、薄肉の切断案内線４が形成される。By this operation, a bead was formed inside and outside the opening guide groove, and the lid body 1 and the opening piece 2 had the same height except for the bead portion. A thin cutting guide wire 4 is formed on the upper surface of the main body 1 at the peripheral edge of the opening piece 2.
【００４８】本実施例では、最薄肉部の鋼板厚みは５５
μになるように調整した。樹脂皮膜も鋼板同様に成形さ
れ、最薄肉部表面に残留した膜厚は両面とも約１５μで
あった。In the present embodiment, the thinnest portion has a steel plate thickness of 55.
It was adjusted to be μ. The resin film was also formed similarly to the steel plate, and the film thickness remaining on the surface of the thinnest part was about 15 μm on both surfaces.
【００４９】開缶性は１．８ｋｇ以下で問題なく開缶さ
れ、樹脂皮膜の通電値は内面側０．２ｍＡ、外面側０．
２ｍＡで実用的に十分満足出来るものであった。又、破
断された切断案内溝の切り口周辺には肉眼的に目立った
フェザーは認められなかった。The can openability was 1.8 kg or less and the can was opened without problems, and the energization value of the resin film was 0.2 mA on the inner surface side and 0.
It was practically sufficiently satisfactory at 2 mA. Further, no visually noticeable feather was observed around the cut end of the broken cutting guide groove.
【００５０】実施例３ 板厚０．２８０ｍｍ、５１８２合金系Ｈ３９のアルミニ
ウム板の表面に、クロム酸を主体とする処理浴中にて電
解後処理を行い、金属クロム１２ｍｇ／ｍ2 およびその
上層に水和酸化クロム１２ｍｇ／ｍ2 （Ｃｒとして）を
有するクロメート皮膜を形成させた。水洗・乾燥後、こ
のアルミニウム板を加熱し、異なった融点を有する２層
構造ポリエステル樹脂で、上層が厚み２０μのアイオノ
マーを含有し、下層が厚み２０μの上層樹脂より低融点
で、全厚み４０μの樹脂フィルムを該アルミニウム板の
両面に積層した。積層後に剥離して測定した皮膜の伸び
は２００％であった。Example 3 The surface of an aluminum plate of 0.282 mm thick 5182 alloy system H39 was subjected to post-electrolytic treatment in a treatment bath mainly containing chromic acid to obtain 12 mg / m 2 of metallic chromium and its upper layer. A chromate film with 12 mg / m 2 of hydrated chromium oxide (as Cr) was formed. After washing and drying with water, this aluminum plate is heated to a two-layer structure polyester resin having different melting points, the upper layer containing an ionomer having a thickness of 20μ, the lower layer having a lower melting point than the upper layer resin having a thickness of 20μ, and a total thickness of 40μ. Resin films were laminated on both sides of the aluminum plate. The elongation of the film measured after peeling after lamination was 200%.
【００５１】この両面に樹脂皮膜を有するアルミニウム
板を、肩半径が０．６ｍｍである上下金型Ａ５，６を用
いて、実施例１と同様の加工を行った。本実施例では、
最薄肉部のアルミニウム板厚みは９５μになるように調
整した。樹脂皮膜もアルミニウム板同様に成形され、最
薄肉部表面に残留した膜厚は約１４μであった。This aluminum plate having a resin film on both sides was processed in the same manner as in Example 1 using upper and lower dies A5 and A6 having a shoulder radius of 0.6 mm. In this embodiment,
The thickness of the aluminum plate in the thinnest part was adjusted to be 95μ. The resin film was also formed similarly to the aluminum plate, and the film thickness remaining on the surface of the thinnest part was about 14 μm.
【００５２】開缶性は１．７ｋｇ以下で問題なく開缶さ
れ、樹脂皮膜の通電値は内面側０．３ｍＡ、外面側０．
３ｍＡで実用的に十分満足出来るものであった。又、破
断された切断案内溝の切り口周辺には肉眼的に目立った
フェザーは認められなかった。The can openability was 1.7 kg or less and the can was opened without problems, and the energization value of the resin film was 0.3 mA on the inner surface side and 0.
It was practically sufficiently satisfactory at 3 mA. Further, no visually noticeable feather was observed around the cut end of the broken cutting guide groove.
【００５３】実施例４ 実施例３と同一のアルミニウム板の表面に、熱硬化ポリ
エステル塗料を塗布、焼付けした。塗装皮膜の厚みは１
５μで、積層後に剥離して測定した皮膜の伸びは１２０
％であった。Example 4 The same aluminum plate surface as in Example 3 was coated with a thermosetting polyester paint and baked. The thickness of the coating film is 1
The elongation of the film measured at 5 μ after peeling after lamination is 120
%Met.
【００５４】この両面に樹脂皮膜を有するアルミニウム
板を、肩半径が０．８ｍｍである上下金型Ａ５，６を用
いて、実施例１と同様の加工を行った。本実施例では、
最薄肉部のアルミニウム板厚みは１００μになるように
調整した。樹脂皮膜もアルミニウム板同様に成形され、
最薄肉部表面に残留した膜厚は約６μであった。This aluminum plate having a resin film on both sides was processed in the same manner as in Example 1 using upper and lower molds A5 and A6 having a shoulder radius of 0.8 mm. In this embodiment,
The thickness of the aluminum plate in the thinnest part was adjusted to 100 μm. The resin film is also formed like the aluminum plate,
The film thickness remaining on the surface of the thinnest portion was about 6 μm.
【００５５】開缶性は１．８ｋｇ以下で問題なく開缶さ
れ、樹脂皮膜の通電値は内面側０．８ｍＡ、外面側０．
９ｍＡで実用的に十分満足出来るものであった。又、破
断された切断案内溝の切り口周辺には肉眼的に目立った
フェザーは認められなかった。The can openability was 1.8 kg or less and the can was opened without problems, and the energization value of the resin film was 0.8 mA on the inner surface side and 0.
It was practically sufficiently satisfactory at 9 mA. Further, no visually noticeable feather was observed around the cut end of the broken cutting guide groove.
【００５６】比較例１ 実施例１と同一のめっき鋼板上に、異なった融点を有す
る２層構造ポリエステル樹脂で、上層が厚み２０μ、下
層が厚み２０μで、下層樹脂は上層樹脂より低融点でア
イオノマーを含有する全厚み４０μの樹脂フィルムを該
鋼板の両面に積層した。積層後に剥離して測定した皮膜
の伸びは３５０％であった。Comparative Example 1 On the same plated steel sheet as in Example 1, a two-layer polyester resin having different melting points was used. The upper layer had a thickness of 20 μ, the lower layer had a thickness of 20 μ, and the lower layer resin had a lower melting point than the upper layer resin. A resin film having a total thickness of 40 μm containing was laminated on both sides of the steel plate. The elongation of the film measured after peeling after lamination was 350%.
【００５７】この両面に樹脂皮膜を有する鋼板を、肩半
径が０．０８ｍｍである上下金型Ａ５，６を用いて、実
施例１と同様の加工を行った。本比較例では、最薄肉部
の鋼板厚みは５７μになるように調整した。This steel sheet having a resin coating on both sides was processed in the same manner as in Example 1 using upper and lower dies A5 and A6 having a shoulder radius of 0.08 mm. In this comparative example, the thickness of the steel plate at the thinnest portion was adjusted to be 57μ.
【００５８】開缶性は１．８ｋｇ以下で問題なく開缶さ
れたが、樹脂皮膜の通電値は内面側１０４．８ｍＡ、外
面側９５．６ｍＡと非常に大きな値を示し、切断案内部
の樹脂皮膜に多くの欠陥発生が認められ、肩半径が小さ
過ぎても実用的に使用できるものができなかった。The can openability was 1.8 kg or less, and the container was opened without any problem, but the energization value of the resin film was 104.8 mA on the inner surface side and 95.6 mA on the outer surface, which were very large values. Many defects were observed in the film, and even if the shoulder radius was too small, it could not be practically used.
【００５９】比較例２ 実施例１と同一のめっき鋼板上に、異なった融点を有す
る２層構造ポリエステル樹脂で、上層が厚み２０μ、下
層が厚み２０μで、下層樹脂は上層樹脂より低融点でア
イオノマーを含有する全厚み４０μの樹脂フィルムを該
鋼板の両面に積層した。積層後に剥離して測定した皮膜
の伸びは３１０％であった。Comparative Example 2 On the same plated steel sheet as in Example 1, a two-layer polyester resin having different melting points was used. The upper layer had a thickness of 20 μ, the lower layer had a thickness of 20 μ, and the lower layer resin had a lower melting point than the upper layer resin. A resin film having a total thickness of 40 μm containing was laminated on both sides of the steel plate. The elongation of the film measured by peeling after lamination was 310%.
【００６０】この両面に樹脂皮膜を有する鋼板を、肩半
径が１．２ｍｍである上下金型Ａ５，６を用いて、実施
例１と同様の加工を行った。本比較例では、最薄肉部の
鋼板厚みは５７μになるように調整した。樹脂皮膜も鋼
板同様に成形され、最薄肉部表面に残留した膜厚は約６
μであった。The steel plates having resin coatings on both sides were processed in the same manner as in Example 1 using upper and lower molds A5 and A6 having a shoulder radius of 1.2 mm. In this comparative example, the thickness of the steel plate at the thinnest portion was adjusted to be 57μ. The resin film is also formed like a steel plate, and the film thickness remaining on the surface of the thinnest part is about 6
It was μ.
【００６１】開缶性は２．０ｋｇ以下と優れ、樹脂皮膜
の通電値は内面側１．２ｍＡ、外面側１．４ｍＡで実用
可能と判断されたが、開口時に破断された切断案内溝の
切り口周辺には膜残りが激しく、外観的な不快感を与
え、肩半径が大き過ぎても実用性に問題が残った。The openability was excellent at 2.0 kg or less, and it was judged that the resin coating had a current-carrying value of 1.2 mA on the inner side and 1.4 mA on the outer side, but the cut guide groove cut at the time of opening was cut. Membrane residue was severe around the periphery, giving an unpleasant appearance, and there was a problem in practicality even if the shoulder radius was too large.
【００６２】比較例３ 実施例３と同一のアルミニウム板の表面に、熱硬化ポリ
エステル塗料を塗布、焼付けした。塗装皮膜の厚みは８
μで、積層後に剥離して測定した皮膜の伸びは１２０％
であった。Comparative Example 3 A thermosetting polyester coating material was applied to the surface of the same aluminum plate as in Example 3 and baked. The thickness of the coating film is 8
The elongation of the film measured by peeling after lamination is 120%, and is 120%.
Met.
【００６３】この両面に樹脂皮膜を有するアルミニウム
板を、肩半径が０．５ｍｍである上下金型Ａ５，６を用
いて、実施例１と同様の加工を行った。本比較例では、
最薄肉部のアルミニウム板厚みは１００μになるように
調整した。This aluminum plate having a resin coating on both sides was processed in the same manner as in Example 1 using upper and lower molds A5 and A6 having a shoulder radius of 0.5 mm. In this comparative example,
The thickness of the aluminum plate in the thinnest part was adjusted to 100 μm.
【００６４】開缶性は１．８ｋｇ以下で問題なく開缶さ
れ、樹脂皮膜の通電値は内面側１００．８ｍＡ、外面側
１１２．９ｍＡで非常に大きな値を示し、切断案内部の
樹脂皮膜に多くの欠陥発生が認められ、実用的に使用で
きるものでなかった。The can openability was 1.8 kg or less and the can was opened without problems, and the energization value of the resin film was 100.8 mA on the inner surface side and 112.9 mA on the outer surface. Many defects were observed and it was not practically usable.
【００６５】比較例４ 実施例１と同一のめっき鋼板上に、６０μの変性ポリプ
ロピレン−ポリエチレン共重合樹脂フィルムを接着層と
して６０μのナイロン６フィルムを鋼板両面に積層し
た。樹脂皮膜の厚みは１２０μであった。積層後に剥離
して測定した皮膜の伸びは４５０％であった。Comparative Example 4 On the same plated steel plate as in Example 1, 60 μm nylon 6 film was laminated on both sides of the steel plate using a 60 μm modified polypropylene-polyethylene copolymer resin film as an adhesive layer. The thickness of the resin film was 120μ. The elongation of the film measured after peeling after lamination was 450%.
【００６６】この両面に樹脂皮膜を有する鋼板を、肩半
径が０．５ｍｍである上下金型Ａ５，６を用いて、実施
例１と同様の加工を行った。本比較例では、最薄肉部の
鋼板厚みは５５μになるように調整した。樹脂皮膜も鋼
板同様に成形され、最薄肉部表面に残留した膜厚は両面
とも約２６μであった。This steel sheet having a resin film on both sides was processed in the same manner as in Example 1 using upper and lower dies A5 and A6 having a shoulder radius of 0.5 mm. In this comparative example, the thickness of the steel plate at the thinnest portion was adjusted to be 55μ. The resin film was also formed similarly to the steel plate, and the film thickness remaining on the surface of the thinnest portion was about 26 μm on both surfaces.
【００６７】成形された製品の開缶性（取っ手を引起こ
す力および開口片を引きちぎる力）は２．０ｋｇ以下と
優れ、樹脂皮膜の通電量は１．５ｍＡ程度で耐食性面で
は実用性があるものと判断されたが、開口時に破断され
た切断案内溝の切り口周辺には膜残りが激しく、外観的
な不快感を与え、実用性に問題が残った。The openability of the molded product (the force to pull up the handle and the force to tear off the opening piece) is excellent at 2.0 kg or less, and the amount of electricity applied to the resin film is about 1.5 mA, which is practical in terms of corrosion resistance. However, it was judged that the film was severely left around the cut edge of the cutting guide groove that was broken at the time of opening, giving an unpleasant appearance and leaving a problem in practicality.
【００６８】比較例５ 実施例３と同一のアルミニウム板の表面に、異なった融
点を有する２層構造ポリエステル樹脂で、上層が厚み２
０μ、下層が厚み２０μで、下層樹脂は上層樹脂より低
融点でアイオノマーを含有する全厚み４０μの樹脂フィ
ルムを該アルミニウム板の両面に積層した。積層後に剥
離して測定した皮膜の伸びは８５％であった。Comparative Example 5 A two-layer polyester resin having different melting points on the surface of the same aluminum plate as in Example 3, the upper layer having a thickness of 2
A resin film having a thickness of 0 μ, a lower layer having a thickness of 20 μ, and a lower resin having a lower melting point than the upper resin and containing an ionomer and having a total thickness of 40 μ was laminated on both surfaces of the aluminum plate. The elongation of the film measured by peeling after lamination was 85%.
【００６９】この両面に樹脂皮膜を有するアルミニウム
板を、肩半径が０．５ｍｍである上下金型Ａ５，６を用
いて、実施例１と同様の加工を行った。本比較例では、
最薄肉部のアルミニウム板厚みは１００μになるように
調整した。This aluminum plate having a resin film on both sides was processed in the same manner as in Example 1 using upper and lower molds A5 and A6 having a shoulder radius of 0.5 mm. In this comparative example,
The thickness of the aluminum plate in the thinnest part was adjusted to 100 μm.
【００７０】開缶性は１．８ｋｇ以下で問題なく開缶さ
れ、樹脂皮膜の通電値は内面側１０４．８ｍＡ、外面側
９８．９ｍＡで非常に大きな値を示し、切断案内部の樹
脂皮膜に多くの欠陥発生が認められ、実用的に使用でき
るものでなかった。The can openability was 1.8 kg or less and the can was opened without problems, and the energization value of the resin film was 104.8 mA on the inner surface side and 98.9 mA on the outer surface. Many defects were observed and it was not practically usable.
【００７１】[0071]
【発明の効果】以上述べたごとく、本発明による易開缶
性蓋の製造方法は、樹脂フィルムを鋼板あるいはアルミ
ニウムにラミネートして得られる素材を使用して、尖鋭
刃を使用しない押圧による薄肉部形成法により切断案内
溝を形成する方法を採用することによって、製造工程に
おいて、一切塗装を行うこと無くして、従来技術の大き
な問題であった加工用工具寿命の問題、耐食性面での不
安等を全く皆無にすることが出来る。As described above, the method for manufacturing an easily openable lid according to the present invention uses a material obtained by laminating a resin film on a steel plate or aluminum, and uses a thin portion by pressing without using a sharp blade. By adopting the method of forming the cutting guide groove by the forming method, there is no need to paint in the manufacturing process, and the problems of the tool life for processing, the concern of corrosion resistance, etc. It can be completely eliminated.
【００７２】特に、スチール製易開缶蓋が実用化されれ
ば、“モノメタル缶”化が可能になることより、近年の
地球環境問題に対応するリサイクルに適した商品を市場
に提供することが可能である。もとより、鋼板そのもの
は経済性に優れた存在であり、缶胴と缶蓋共に鋼板製と
することにより、経済性により優れ、資源としての再利
用を行いやすい商品となることが期待される。In particular, if the steel easy-open can lid is put into practical use, it becomes possible to make it into a "monometal can", and therefore to provide the market with products suitable for recycling in response to recent global environmental problems. Is possible. Naturally, the steel sheet itself is highly economical, and it is expected that the steel sheet for both the can body and the can lid will be a more economical product that can be easily reused as a resource.
【図１】本発明による缶蓋の例の斜視図。FIG. 1 is a perspective view of an example of a can lid according to the present invention.
【図２】本発明の実施例を工程順に示す縦断面図。FIG. 2 is a vertical sectional view showing an embodiment of the present invention in the order of steps.
【図３】本発明の実施例を工程順に示す縦断面図。FIG. 3 is a vertical sectional view showing an embodiment of the present invention in the order of steps.
【図４】本発明の実施例を工程順に示す縦断面図。FIG. 4 is a vertical sectional view showing an embodiment of the present invention in the order of steps.
【図５】切断案内溝の両側にビードを形成する状態を示
す縦断面図。FIG. 5 is a vertical cross-sectional view showing a state in which beads are formed on both sides of the cutting guide groove.
【図６】従来技術による断面Ｖ字型の切断案内溝を示す
部分拡大図。FIG. 6 is a partially enlarged view showing a cutting guide groove having a V-shaped cross section according to a conventional technique.
１…蓋本体 ２…開口片 ４…切断案内線 ５…上金型Ａ ６…下金型Ａ ７…連片 ８…上金型Ｒ部 ９…下金型Ｒ部 １０…上金型Ｂ １１…下金型Ｂ １２…凹溝 １３…凸部 １４…上金型Ｃ １５…下金型Ｃ １６…ビード １７…凹部 １８…凸部 DESCRIPTION OF SYMBOLS 1 ... Lid main body 2 ... Opening piece 4 ... Cutting guide line 5 ... Upper mold A 6 ... Lower mold A 7 ... Connecting piece 8 ... Upper mold R part 9 ... Lower mold R part 10 ... Upper mold B 11 ... Lower mold B 12 ... Recessed groove 13 ... Convex part 14 ... Upper mold C 15 ... Lower mold C 16 ... Bead 17 ... Recessed part 18 ... Convex part
Claims (2)
上下金型の肩半径が、０．１〜１．０ｍｍである金型を
用い、上下金型の該肩半径部分にて、厚さ１０〜１００
μ、破断伸び１００％以上の樹脂皮膜を両面に有する鋼
板あるいはアルミニウム板を押圧加工成形し、加工最薄
部の金属厚みを加工前の金属厚みの１／２以下に薄くす
ることにより切断案内溝を形成することを特徴とする易
開缶性蓋の製造方法。1. A die having a shoulder radius of the cutting guide groove forming upper and lower dies forming the opening piece shape is 0.1 to 1.0 mm, and a thickness of the upper and lower dies at the shoulder radius portion is set. 10 to 100
Cutting guide groove by pressing and forming a steel plate or aluminum plate having a resin film with μ and a breaking elongation of 100% or more on both sides and thinning the metal thickness of the thinnest part to less than half of the metal thickness before processing A method for producing an easily-openable lid, which comprises forming.
在する樹脂皮膜が、ポリエチレン、ポリプロピレン、ポ
リアミド、ポリエステル、アイオノマー等の熱可塑性樹
脂の１種または２種以上から構成されることを特徴とす
る請求項１記載の易開缶性蓋の製造方法。2. A resin film present on both sides of a steel plate or an aluminum plate is composed of one or more thermoplastic resins such as polyethylene, polypropylene, polyamide, polyester and ionomer. 1. The method for producing an easily openable lid according to 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4329703A JP3027059B2 (en) | 1992-12-09 | 1992-12-09 | Method for producing easy-open lid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4329703A JP3027059B2 (en) | 1992-12-09 | 1992-12-09 | Method for producing easy-open lid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06170472A true JPH06170472A (en) | 1994-06-21 |
| JP3027059B2 JP3027059B2 (en) | 2000-03-27 |
Family
ID=18224325
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4329703A Expired - Fee Related JP3027059B2 (en) | 1992-12-09 | 1992-12-09 | Method for producing easy-open lid |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3027059B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0811441A1 (en) * | 1995-02-22 | 1997-12-10 | Nippon Steel Corporation | Easily openable metallic can lid of superior openability and method of manufacturing same |
| WO2015036365A1 (en) * | 2013-09-16 | 2015-03-19 | Abb Ag | Method for embossing and cutting into workpieces, and embossing tool |
-
1992
- 1992-12-09 JP JP4329703A patent/JP3027059B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0811441A1 (en) * | 1995-02-22 | 1997-12-10 | Nippon Steel Corporation | Easily openable metallic can lid of superior openability and method of manufacturing same |
| EP0811441A4 (en) * | 1995-02-22 | 1998-12-02 | Nippon Steel Corp | Easily openable metallic can lid of superior openability and method of manufacturing same |
| US5927536A (en) * | 1995-02-22 | 1999-07-27 | Nippon Steel Corporation | Metal easy open can lid superior in can openability and process for production of thereof |
| WO2015036365A1 (en) * | 2013-09-16 | 2015-03-19 | Abb Ag | Method for embossing and cutting into workpieces, and embossing tool |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3027059B2 (en) | 2000-03-27 |
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