JPH08224628A - Production of cap of push button type east can opening ability of thermoplastic laminate steel sheet - Google Patents
Production of cap of push button type east can opening ability of thermoplastic laminate steel sheetInfo
- Publication number
- JPH08224628A JPH08224628A JP7033247A JP3324795A JPH08224628A JP H08224628 A JPH08224628 A JP H08224628A JP 7033247 A JP7033247 A JP 7033247A JP 3324795 A JP3324795 A JP 3324795A JP H08224628 A JPH08224628 A JP H08224628A
- Authority
- JP
- Japan
- Prior art keywords
- resin film
- thickness
- temperature
- steel sheet
- guide groove
- 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.)
- Withdrawn
Links
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、この原理を応用
した取っ手を付設したものと、取っ手が無く人間が指の
力で直接押し破り開缶するものの２つに大別できる。取
っ手付き型は、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。両方式とも、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-open can lid that allows a part or almost the entire surface of a container lid to be opened easily by hand is provided with a handle that applies this principle, and without a handle, a person can directly push with the force of a finger. It can be roughly divided into two, which can be torn and opened. As for the type with a handle, a tear-off method in which the handle and the opening piece are torn off and separated from the can body, and a Stein tab method in which both the handle and the opening piece remain fixed to the can body after opening the can are put into practical use. In both methods, most of the easy-open can lids are made of aluminum plate for manufacturing technology reasons,
Steel sheets are currently used in some limited applications.
【０００３】取っ手付き型易開缶蓋の従来技術の代表例
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５に示すように断面Ｖ字形の切断案内溝３で
囲まれる開口片形状を形成していた。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。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問題点があった。As a typical example of the prior art of the easy-open can lid with a handle, a coated aluminum plate or a 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, By pressing a sharpened blade having a required contour shape from the upper surface and biting the blade edge into the lid body, an opening piece shape surrounded by the cutting guide groove 3 having a V-shaped cross section is formed as shown in FIG. Was. Regarding the formation of the cutting guide groove, it is necessary to violently press the sharp blade up to about half to ⅔ 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. Therefore, although the machining tool is required to have a considerable accuracy, the tool life is a problem because the sharp blade needs to be pressed strongly. Especially for steel plates, there is a problem that the tool life cannot be maintained.
【０００４】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。
工具寿命の延長対策としては、特開昭５５−７０４３４
号公報、特開昭５７−１７５０３４号公報等に見られる
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。また、取っ手無し型
は、押しボタン型に代表され、成形された開口片を人が
直接指で押すことによって、開口片の周辺部が押し破ら
れて開口部が作り出されるものである。Further, in order to secure the corrosion resistance to the contents and 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.
As a measure for extending the tool life, JP-A-55-70434 is known.
As disclosed in Japanese Patent Laid-Open Publication No. 57-175034 and the like, 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. Further, the handleless type is represented by a push button type, and a person directly pushes the formed opening piece with a finger to push and break the peripheral portion of the opening piece to create an opening.
【０００５】従来技術としての取っ手無し型の押しボタ
ン型易開缶蓋の代表例としては、塗装あるいは熱可塑性
樹脂積層鋼板を素材とし、基本的な蓋形状に打抜き後、
開缶時に開口片が本体側に固着されるように一部切断し
ない部分を残し、開口部分が切断される。このとき、開
口片は開口部よりわずかに径が大きくなるように、かつ
缶内面側に切り出される。開口片の径が開口部より大き
く、かつ缶内面側にあることによって、缶内圧力によっ
て、開缶しないようにするためである。この様な開口部
を大小２個成形する。その後、切断された開口部と開口
片は、密閉性、内容物に対する耐食性の確保及び外面錆
の発生防止のため、内面側は熱可塑性樹脂によるシール
によって開口片と開口部の接着補修が、また、外面側は
補修塗装が必要とされる。開缶時は、小さな力で押すこ
とにより開缶できる小径の開口部を先に開缶した後、大
径の開口部を開口させる。内容物の流し出しには大径の
開口部を利用し、小径の開口部は空気穴として利用され
る。押しボタン型は、欧州で鋼板製のものが実用化され
ている。As a typical example of a conventional push-button type easy-open can lid without a handle, a coated or thermoplastic resin laminated steel plate is used as a material, and after punching into a basic lid shape,
When opening the can, the opening part is cut, leaving a part that is not cut so that the opening piece is fixed to the main body side. At this time, the opening piece is cut out to the inner surface side of the can such that the diameter thereof is slightly larger than the opening portion. This is because the diameter of the opening piece is larger than that of the opening and is on the inner surface side of the can, so that the opening of the can is prevented by the pressure inside the can. Two large and small openings are formed. After that, the cut opening and the opening piece are sealed and sealed by a thermoplastic resin on the inner surface for adhesion repair of the opening and the opening piece, in order to secure hermeticity, corrosion resistance to the contents, and prevent the occurrence of rust on the outer surface. The outer surface requires repair painting. When opening a can, a small-diameter opening that can be opened by pushing with a small force is opened first, and then a large-diameter opening is opened. A large-diameter opening is used for pouring out the contents, and a small-diameter opening is used as an air hole. The push button type is made of steel plate and has been put to practical use in Europe.
【０００６】[0006]
【発明が解決しようとする課題】上述のごとく、従来の
易開缶蓋は、開口案内溝を成形後に補修塗装の必要があ
る。さらに、従来の取っ手無し型の易開缶蓋は、製造途
中で一度、開口片と開口部を切断するため、シール接着
及び補修塗装を行う必要がある。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。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
蓋はほとんど鋼板製である。このため、開缶性に優れ、
内外面の補修塗装不要な、耐食性の優れた、鋼板製易開
缶蓋を、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。As described above, the conventional easy-open can lid requires repair painting after forming the opening guide groove. Further, in the conventional easy-open can lid without a handle, since the opening piece and the opening are cut once during the manufacturing, it is necessary to perform seal adhesion and repair painting. Not only is painting a complicated baking process, it also requires a long period of heating for baking, and a large amount of the solvent contained in the paint is discharged during the baking process. There is a problem that the 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. Regarding recycling, even for metal cans, so-called "monometal cans", in which the can body and the can lid are made of the same material, are suitable for recycling. Is mostly made of aluminum. On the other hand, the can lid and the can lid other than the easy-open can lid are mostly made of steel plate. Therefore, it has excellent openability,
It is eagerly desired to develop a method for manufacturing a steel plate easy-open can lid with excellent corrosion resistance that does not require repair coating on the inner and outer surfaces with high productivity.
【０００７】[0007]
【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、缶蓋の開口片縁を
構成する切断案内溝形成用の肩半径が０．０５〜１．０
ｍｍである上下金型で、厚さ１０〜１００μｍ、伸び２
００％以上、結晶化度１０％以下、結晶融解熱１０Ｊｏ
ｕｌ／ｇ以上の結晶性飽和ポリエステル系樹脂皮膜を両
面に有する鋼板を押圧加工成形し、加工最薄部の鋼板厚
みを加工前鋼板厚みの４０％以下とし、さらに必要に応
じて押戻し加工を行って切断案内溝を形成することを特
徴とする熱可塑性樹脂ラミネート鋼板製押しボタン型易
開缶性蓋の製造方法であって、さらに必要に応じて、押
圧加工成形と押し戻し加工の片方または両方を前記結晶
性飽和ポリエステル系樹脂皮膜のガラス転移点温度〜冷
結晶化温度で行うことと、少なくとも切断案内溝周辺部
の樹脂皮膜を該樹脂皮膜の冷結晶化開始温度〜融点の温
度に加熱熱処理することの、少なくとも一方を行うもの
である。SUMMARY OF THE INVENTION The present invention has been made to solve the above problems and has a shoulder radius of 0.05 to 1 for forming a cutting guide groove which constitutes one edge of an opening of a can lid. .0
The upper and lower dies have a thickness of 10 to 100 μm and an elongation of 2
00% or more, crystallinity 10% or less, heat of fusion of crystal 10Jo
A steel plate having a crystalline saturated polyester resin coating film of ul / g or more on both sides is press-formed, and the steel plate thickness at the thinnest part is set to 40% or less of the steel plate thickness before processing, and further push-back processing is performed if necessary. A method of manufacturing a push-button type easy-open lid made of a thermoplastic resin laminated steel plate, characterized by forming a cutting guide groove by further performing, if necessary, one or both of press forming and push-back processing. Is performed at a glass transition temperature to a cold crystallization temperature of the crystalline saturated polyester resin film, and at least the resin film around the cutting guide groove is heated to a temperature of a cold crystallization start temperature to a melting point of the resin film. To do at least one of the following:
【０００８】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。本発明に使用
される鋼板は、通常、板厚ｔ0 ：０．０８０〜０．２５
０ｍｍの範囲にあり、硬度（ＨR30T）４６〜６８、伸
び：１０〜６０％程度の機械的性質を有するものが使用
される。この鋼板の表面に、Ｓｎ，Ｃｒ，Ｎｉ，Ａｌ，
Ｚｎの１種または２種以上の金属めっきを行い、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。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／ｍ 2 、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。Hereinafter, the present invention will be described in detail. The present invention
Achieved by combining materials and processing methods
It is an invention. First, the material will be described. Used in the present invention
The steel plate to be formed usually has a plate thickness t.0: 0.080 to 0.25
Within the range of 0 mm, hardness (HR30T) 46-68, Shin
B: Used with mechanical properties of 10 to 60%
Is done. On the surface of this steel sheet, Sn, Cr, Ni, Al,
Apply one or more metal plating of Zn and
Eliminates the need for repair coating after lid manufacturing on the coating film
Therefore, a resin film with excellent adhesion, processability and corrosion resistance is
Layered. As the steel sheet used specifically, the amount of adhesion
0.5-3.0 g / m2 After tin plating of
Tin-plated steel sheet, adhesion amount 0.3-2.0g / m2 Nicke
Nickel-plated steel sheet that has been subjected to chemical conversion treatment after nickel plating, Sn
And 0.5 to 2.0 g / m as the amount of Ni deposited respectively2 ,
0.01-0.5 g / m2 After plating Ni and Sn in this order
Sn / Ni plated steel sheet with chemical conversion treatment, metal Cr adhesion
50-200mg / m 2 , Oxide Cr5-30mg / m
2 Normal TFS (Tin Free Steel)
There are chrome and chromate treated steel sheets that are exposed.
【０００９】上述の鋼板の両面上の積層樹脂は、厚み１
０〜１００μｍ、伸び２００％以上、結晶化度１０％以
下で結晶融解熱１０Ｊｏｕｌ／ｇ以上の結晶性飽和ポリ
エステル系樹脂皮膜である。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。又、開缶時に、切断案
内溝の切り口端面に、樹脂のみが局部的に残存（膜残り
現象、以下フェザーと称す）し、外観的な印象を損なう
ことを防ぐために、特定の樹脂を使用する必要がある。The laminated resin on both sides of the above steel plate has a thickness of 1
It is a crystalline saturated polyester resin film of 0 to 100 μm, an elongation of 200% or more, a crystallinity of 10% or less, and a heat of fusion of crystal of 10 Joul / g or more. 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. Also, when opening the can, a specific resin is used to prevent the resin from locally remaining on the end face of the cutting guide groove (film remaining phenomenon, hereinafter referred to as feather) and impairing the appearance impression. There is a need.
【００１０】本発明での結晶性飽和ポリエステル系樹脂
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。さらに、本
発明で使用される金属板樹脂皮膜に、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。The crystalline saturated 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. The dicarboxylic acid component may be terephthalic acid, isophthalic acid, phthalic acid, adipic acid, sebacic acid, azelaic acid, 2,6-naphthalenedicarboxylic acid, decanedicarboxylic acid, dodecanedicarboxylic acid, cyclohexanedicarboxylic acid, etc., alone or in a mixture. As the diol component, ethylene glycol, butanediol, decanediol, hexanediol, cyclohexanediol, neopentyl glycol or the like may be used alone or in 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. Further, if necessary, additives such as a plasticizer, an antioxidant, a heat stabilizer, inorganic particles, a pigment, an organic lubricant and the like are added to the metal plate resin film used in the present invention.
【００１１】本発明に用いるラミネート鋼板の樹脂皮膜
の厚みを１０〜１００μとした理由は、後述する押圧加
工によって鋼板とともに樹脂皮膜も薄く成形されること
から、１０μ未満では特に加工部での樹脂皮膜のバリア
ー性（耐食性、耐錆性）が確保されないためであり、１
００μ超では、樹脂皮膜のバリアー性に対して効果が飽
和し、経済的に不利を招くためである。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。本発明に用いるラミネート金属板上の積層
樹脂の必要物性として、破断伸びが２００％以上かつ結
晶化度１０％以下であることが重要である。破断伸び２
００％未満あるいは結晶化度５％超では、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。さらに好
ましくは２５０％以上の伸びを有する皮膜が好ましい。
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、ＪＩＳ Ｃ２３１８に準じた方法で測定され
る。The reason why the thickness of the resin coating of the laminated steel sheet used in the present invention is set to 10 to 100 μ is that the resin coating is thinly formed together with the steel sheet by the pressing process described later, and if the thickness is less than 10 μ, the resin coating is particularly formed in the processed portion. This is because the barrier properties (corrosion resistance, rust resistance) of
This is because if it exceeds 00μ, the effect is saturated with respect to the barrier property of the resin film, which is economically disadvantageous. Performance stability
In consideration of economic efficiency, the range of 16 to 60 μm is particularly effective. As a required physical property of the laminated resin on the laminated metal plate used in the present invention, it is important that the elongation at break is 200% or more and the crystallinity is 10% or less. Breaking elongation 2
When it is less than 00% or the crystallinity is more than 5%, it is not preferable because a large number of defects are caused in the resin film due to insufficient elongation for forming a thin portion at the time of pressing, which will be described later. More preferably, a film having an elongation of 250% or more is preferable.
The elongation property of the laminated resin film is measured by a method according to JIS C2318 after peeling the resin film from the substrate.
【００１２】なお、本発明でいう結晶化度とは次の手順
で測定した値である。 （１）樹脂層についてのＸ線回折強度を２θ＝５〜４０
の範囲で測定する。 （２）２θ＝１０，２θ＝３５におけるＸ線回折強度曲
線を直線で結び、ベースラインとする。 （３）樹脂層と同一樹脂を溶融後液体窒素中に投入する
などの手段により、ほぼ完全非晶質と考えられる試料と
し、これについて（１）と同一条件でＸ線回折強度を測
定する。 （４）（１）で得た回折強度線の結晶回折ピークのすそ
をなめらかな曲線で結ぶ。なお、その曲線の形状は
（３）で測定した非晶質試料の回折強度曲線と相似形に
なるようにする。 （５）（２）のベースラインと（４）の曲線に囲まれた
部分の面積をＩａ、（１）の回折強度曲線に囲まれた部
分の面積をＩｃとする。 （６）｛Ｉｃ／Ｉａ＋Ｉｃ｝×１００を結晶化度とす
る。The crystallinity referred to in the present invention is a value measured by the following procedure. (1) The X-ray diffraction intensity of the resin layer is 2θ = 5 to 40
Measure within the range. (2) The X-ray diffraction intensity curves at 2θ = 10 and 2θ = 35 are connected by a straight line to form a baseline. (3) An X-ray diffraction intensity is measured under the same conditions as (1) for a sample considered to be almost completely amorphous by means such as pouring the same resin as the resin layer into liquid nitrogen after melting. (4) The bottom of the crystal diffraction peak of the diffraction intensity line obtained in (1) is connected by a smooth curve. The shape of the curve should be similar to the diffraction intensity curve of the amorphous sample measured in (3). (5) The area surrounded by the baseline of (2) and the curve of (4) is Ia, and the area surrounded by the diffraction intensity curve of (1) is Ic. (6) The crystallinity is {Ic / Ia + Ic} × 100.
【００１３】さらに、本発明に用いるラミネート金属板
上の積層樹脂の必要物性として、結晶融解熱が１０Ｊｏ
ｕｌ／ｇ以上であることが重要である。これまでの発明
者の知見から、後述する押圧加工によって得られる易開
缶性蓋においては、少なくとも切断案内溝周辺の缶内外
面の樹脂皮膜を、結晶化度２０％以上、伸び１００％以
下にしなければ、開缶時のフェザーリング問題が発生す
る。即ち、開口片を押し込んで開缶した場合、切断案内
溝周辺の樹脂皮膜を、結晶化度２０％未満或いは伸び１
００％超では、切り口部に膜の破断片が目立ち、外観的
な不快感を与える。押圧加工における加工性について
は、ラミネート金属板の皮膜は低結晶化度と高い伸び性
とが必要である。一方、フェザーリングに関しては、高
結晶化度と低い伸び性とが必要であり、矛盾を生じるこ
とになる。Further, as a required physical property of the laminated resin on the laminated metal plate used in the present invention, the heat of fusion of crystal is 10 Jo.
It is important that it is ul / g or more. From the knowledge of the inventor to date, in the easily openable lid obtained by the pressing process described below, at least the resin film on the inner and outer surfaces of the can around the cutting guide groove has a crystallinity of 20% or more and an elongation of 100% or less. Otherwise, there will be a feathering problem when opening the can. That is, when the opening piece is pushed in to open the can, the resin film around the cutting guide groove has a crystallinity of less than 20% or an elongation of 1%.
If it exceeds 00%, a broken piece of the film becomes conspicuous at the cut portion, giving an unpleasant appearance. Regarding workability in pressing, a film of a laminated metal plate is required to have low crystallinity and high extensibility. On the other hand, regarding feathering, high crystallinity and low extensibility are required, which causes a contradiction.
【００１４】そこで、押圧加工前では、低結晶化度と高
い伸び性とを有する皮膜を、押圧加工後に、少なくとも
切断案内溝周辺の缶内外面の樹脂皮膜物性を加熱、冷結
晶化させることにより、高結晶化度と低い伸び性へと変
えることにより、この矛盾を解決した。種々検討を行っ
た結果、破断伸びが２００％以上かつ結晶化度１０％以
下の物性を有するポリエステル樹脂系皮膜を加熱によっ
て効率よく結晶化度２０％以上、伸び１００％以下とす
るには、樹脂皮膜物性として、結晶融解熱が１０Ｊｏｕ
ｌ／ｇ以上必要であることを見いだした。Therefore, before pressing, a film having low crystallinity and high extensibility is formed by heating and cold crystallization of at least the resin film physical properties on the inside and outside of the can around the cutting guide groove after pressing. , This contradiction was solved by changing to high crystallinity and low extensibility. As a result of various studies, in order to efficiently obtain a crystallinity of 20% or more and an elongation of 100% or less by heating a polyester resin film having physical properties of elongation at break of 200% or more and crystallinity of 10% or less, As the physical properties of the film, the heat of crystal fusion is 10 Jou.
It was found that 1 / g or more was necessary.
【００１５】本発明における樹脂の結晶融解熱は、樹脂
を予め樹脂の融点＋３０℃まで加熱し、５分間保持溶融
した後、１０℃／分の降温速度で３０℃以下に冷却した
ものを試料として、示差走査熱量計（ＤＳＣ）で１０℃
／分の昇温速度で測定し、結晶の融解を示すピークの大
きさ（面積）が結晶融解熱（ΔＨｆ）である。この結晶
融解熱はＪｏｕｌ／ｇで表され、これが大きいことは結
晶性の強い樹脂であることを示している。なお、ここで
の融点とは、示差走査熱量計（ＤＳＣ）で１０℃／分の
昇温速度で測定して得られる結晶融解を示す吸熱ピーク
の吸熱量が最大値となる温度を言う。The heat of crystal fusion of the resin in the present invention is obtained by heating the resin in advance to the melting point of the resin + 30 ° C., holding and melting for 5 minutes, and then cooling to 30 ° C. or less at a temperature decreasing rate of 10 ° C./minute as a sample. Differential scanning calorimeter (DSC) at 10 ° C
The size (area) of the peak indicating the melting of the crystal is the heat of crystal melting (ΔHf), which is measured at a temperature rising rate of / min. This heat of fusion of crystal is represented by Joul / g, and the large heat indicates that the resin has a strong crystallinity. The melting point here means a temperature at which the endothermic amount of an endothermic peak showing crystal melting obtained by measurement with a differential scanning calorimeter (DSC) at a temperature rising rate of 10 ° C./min becomes the maximum value.
【００１６】次に、加工方法について説明する。開口部
を形成するにあたり、従来技術による尖鋭刃の押圧方式
或いは剪断加工では、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。本発明者らは、鋼
板及び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、０．０
５〜１．０ｍｍ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
た鋼板を該樹脂皮膜温度が該樹脂のガラス転移点以上冷
結晶化温度以下の温度に加熱し押圧加工成形し、加工最
薄部の金属厚みを加工前の金属厚みの４０％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。Next, the processing method will be described. In forming the opening, the pressing method of a sharp blade or the shearing process according to the prior art is not preferable because the resin film is broken and repair coating after molding is required. As a processing method for forming a cutting guide groove that ensures easy opening without breaking the steel plate and the resin film, the present inventors have found that the shoulder radii of the upper and lower molds for forming the cutting guide groove forming the opening piece shape are , 0.0
Using a mold having a diameter of 5 to 1.0 mm, as shown in FIG. 2, at the shoulder radius portions of the upper and lower molds, the above-mentioned steel plates coated with resin on the both sides have the resin film temperature of the glass transition point of the resin. The most suitable method is to form the cutting guide groove by heating to a temperature not higher than the cold crystallization temperature and pressing and forming, and thinning the metal thickness of the thinnest part to 40% or less of the metal thickness before processing. I found it.
【００１７】切断案内溝形成用上下金型の肩半径を、
０．０５〜１．０ｍｍとした理由について述べる。肩半
径０．０５ｍｍ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 to 0.05 to 1.0 mm will be described. If the shoulder radius is smaller than 0.05 mm, the portion of the shoulder radius is sharp, so that the laminating resin film of the material to be processed may be 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.
【００１８】加工時の皮膜温度を皮膜樹脂のガラス転移
点以上冷結晶化温度以下とした理由について述べる。加
工時の皮膜温度がガラス転移点Ｔｇ未満では、加工時の
衝撃により、樹脂皮膜に微細な亀裂が発生することがあ
り、この微細亀裂が耐食性上の問題を引き起こすことが
ある。また、冷結晶化温度超では樹脂皮膜が結晶化す
る。結晶化した皮膜は伸びが低下し加工に追随できなく
なり、皮膜欠陥を生じる。このため、加工時の皮膜温度
をポリエステル系樹脂皮膜のガラス転移点Ｔｇ以上、冷
結晶化温度以下の範囲とする。さらに好ましくは、ポリ
エステル系樹脂皮膜のガラス転移点Ｔｇ＋１０℃以上、
冷結晶化温度−１０℃以下の範囲とする。The reason why the film temperature during processing is set to the glass transition point of the film resin or more and the cold crystallization temperature or less will be described. When the film temperature during processing is lower than the glass transition point Tg, a fine crack may occur in the resin film due to an impact during processing, and the fine crack may cause a problem in corrosion resistance. In addition, the resin film crystallizes above the cold crystallization temperature. The crystallized film has a low elongation and cannot follow the processing, resulting in a film defect. For this reason, the film temperature during processing is set to a range not lower than the glass transition point Tg of the polyester resin film and not higher than the cold crystallization temperature. More preferably, the glass transition point Tg of the polyester resin film + 10 ° C or higher,
The cold crystallization temperature is -10 ° C or lower.
【００１９】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４０％以
下、更に望ましくは３０％以下とする必要がある。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。この加工により形成された最薄部
が、開缶時の破断位置と確定されるが、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蓋外面側に凸
状ボタンになるように加工を行うことが望ましい。な
お、押戻し加工時も、樹脂皮膜がガラス転移点以上冷結
晶化温度以下の温度範囲となるように加工されることが
望ましい。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 with a gradual plate thickness change. The metal thickness of the thinnest part needs to be 40% or less, more preferably 30% or less of the metal thickness before processing from the viewpoint of can openability. The thickness of the thinnest part can be set to a desired value according to the workability of the material by setting the processing conditions as required.
The processing conditions are selected according to the workability of the base metal plate and the laminate film. The thinnest part formed by this processing is determined as the breaking position at the time of opening the can, but for improving the can opening property and making the shape of the opening after the can opening desirable,
It is desirable to process the opening piece extruded upward or downward so that it becomes a convex button on the outer surface side of the lid. Even during the push-back process, it is desirable that the resin film is processed so as to be in the temperature range from the glass transition point to the cold crystallization temperature.
【００２０】さらに、本発明においては、切断案内溝を
形成させたのちに、その後の一連の製蓋工程あるいは製
缶工程中において少なくとも切断案内溝周辺部の樹脂皮
膜温度を樹脂皮膜の冷結晶化開始温度以上融点以下とす
る加熱熱処理を行う。熱処理を行う理由について述べ
る。上述したように、押圧加工に対してラミネート金属
板の樹脂皮膜が追随するためには、低結晶化度でかつ高
い伸び性即ち結晶化度１０％以下かつ伸び２００％以上
の皮膜特性が必要とされる。一方、開缶時のフェザー性
を良好とするためには、皮膜特性を結晶化度２０％以上
かつ伸び１００％以下とする必要がある。そこで、本発
明では先ず、押圧加工における加工性を確保するため
に、結晶化度１０％以下で、伸びが２００％以上あるポ
リエステル樹脂皮膜を有するラミネート金属板を用い切
断案内溝を形成した後に、樹脂皮膜の結晶化度を２０％
以上かつ伸びを１００％以下とするために熱処理を行
う。Further, in the present invention, after the cutting guide groove is formed, the temperature of the resin film at least in the periphery of the cutting guide groove is controlled by cold crystallization of the resin film during the subsequent series of lid-making process or can making process. A heat treatment is performed at a temperature not lower than the starting temperature and not higher than the melting point. The reason for performing heat treatment will be described. As described above, in order for the resin film of the laminated metal plate to follow the pressing process, it is necessary to have a low crystallinity and a high extensibility, that is, a film property of a crystallinity of 10% or less and an elongation of 200% or more. To be done. On the other hand, in order to improve the feathering property when opening the can, it is necessary to set the film characteristics to have a crystallinity of 20% or more and an elongation of 100% or less. Therefore, in the present invention, first, in order to secure workability in pressing, after forming a cutting guide groove using a laminated metal plate having a polyester resin film having a crystallinity of 10% or less and an elongation of 200% or more, 20% crystallinity of resin film
The heat treatment is performed so that the elongation is 100% or less.
【００２１】熱処理による皮膜温度としては、効率的に
皮膜を結晶化させるために、樹脂皮膜の冷結晶化開始温
度を下限とし、樹脂皮膜の溶融流動による外観不良や樹
脂皮膜の熱劣化を防ぐことから、融点を上限とした。加
工時の皮膜温度及び熱処理の条件は、使用する熱可塑性
樹脂によってガラス転移点Ｔｇ、冷結晶化温度、冷結晶
化開始温度及び融点が異なるため、使用する熱可塑性樹
脂毎に選定しなければならない。これらは、示差走査熱
量計（ＤＳＣ）にて、昇温速度１０℃／分で、熱可塑性
樹脂皮膜について昇温測定を行い求める。ガラス転移点
Ｔｇはガラス状態からゴム状態へ変化する変曲点、冷結
晶化温度は冷結晶化のピーク温度、冷結晶化開始温度
は、冷結晶化のピークの立ち上がり温度、融点は結晶融
解のピーク温度である。Regarding the film temperature by heat treatment, in order to efficiently crystallize the film, the cold crystallization start temperature of the resin film is set to the lower limit to prevent appearance defects and thermal deterioration of the resin film due to melt flow of the resin film. Therefore, the melting point was made the upper limit. Since the glass transition point Tg, the cold crystallization temperature, the cold crystallization start temperature and the melting point differ depending on the thermoplastic resin used, the film temperature and the heat treatment conditions during processing must be selected for each thermoplastic resin used. . These are obtained by measuring the temperature rise of the thermoplastic resin film with a differential scanning calorimeter (DSC) at a temperature rise rate of 10 ° C./min. The glass transition point Tg is the inflection point at which the glass state changes to the rubber state, the cold crystallization temperature is the cold crystallization peak temperature, the cold crystallization start temperature is the cold crystallization peak rising temperature, and the melting point is the crystal melting temperature. It is the peak temperature.
【００２２】また、皮膜の加熱方法としては、特に限定
しないが、一例としては、加熱炉中での加熱、熱風吹き
付けによる加熱、バーナーの直下火加熱、赤外線加熱、
誘導加熱による基板の金属板からの加熱、加熱された固
体接触させる方法等が挙げられる。また、特に製蓋工程
の途中での熱処理の場合には、その後の樹脂皮膜の加工
性を考慮すると、切断案内溝周辺部のみを加熱する事が
望ましい。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、互いに凸の潤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。さらに、切断案内溝を成形した後、熱処理を行う
ことにより、フェザー性の優れた易開缶蓋の製造が可能
となる。以下、本発明の実施例を示す。The method for heating the coating is not particularly limited, but examples thereof include heating in a heating furnace, heating by blowing hot air, heating directly under a burner, and infrared heating.
Examples include a method of heating a substrate from a metal plate by induction heating and a method of bringing a heated solid into contact with the substrate. Further, particularly in the case of heat treatment during the lid making process, it is desirable to heat only the peripheral portion of the cutting guide groove in consideration of the workability of the resin film thereafter. In these series of processing steps, the resin film having the above 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 can be guaranteed. Further, according to the method of the present invention, since the processing is basically based on press working such as extrusion or pushback by shoulder radius portions having convex curved surfaces, the tool life found in the pressing method of a sharp blade There is no problem of, and excellent productivity is guaranteed. Furthermore, by performing heat treatment after forming the cutting guide groove, it becomes possible to manufacture an easy-open can lid having excellent feathering properties. Examples of the present invention will be shown below.
【００２３】[0023]
実施例１ 板厚０．１５０ｍｍ、硬度５４（ＨR30-T ）の薄鋼板の
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１１０ｍｇ／ｍ2 およびその上層に
水和酸化クロム１５ｍｇ／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で下層が厚み３μであり、下
層樹脂は上層樹脂より低融点で全厚み４０μの樹脂フィ
ルムを該鋼板の両面に積層した。積層された皮膜の結晶
化度は４％であった。また、積層後に剥離して測定した
皮膜の伸びは３００％であった。さらに、樹脂皮膜の結
晶融解熱量は２８Ｊｏｕｌ／ｇ、冷結晶温度は１３０
℃、冷結晶化開始温度は１１３℃、ガラス転移点は７２
℃、融点は２３０℃であった。Example 1 The surface of a thin steel plate having a plate thickness of 0.150 mm and a hardness of 54 (H R30-T ) was subjected to electrolytic post-treatment in a treatment bath mainly containing chromic acid to obtain metallic chromium of 110 mg / m 2 and its upper layer. To form a chromate film having 15 mg / m 2 (as Cr) of hydrated chromium oxide. After being washed and dried, this steel sheet is heated to a two-layer polyester resin having different melting points. The upper layer has a thickness of 37μ and the lower layer has a thickness of 3μ, and the lower resin has a melting point lower than that of the upper resin and a total thickness of 40μ. Was laminated on both sides of the steel plate. The crystallinity of the laminated coating was 4%. Further, the elongation of the film measured after peeling after lamination was 300%. Furthermore, the heat of crystal fusion of the resin film is 28 Joule / g, and the cold crystal temperature is 130.
℃, cold crystallization start temperature is 113 ℃, glass transition point is 72
The melting point was 230 ° C.
【００２４】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。なお、
加工は皮膜温度が１００℃となるように金型及び素材を
加熱して行った。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。次いで図３に示すよう
に、開口片２の周縁部に相当する部分に凸部１３を有す
る下金型Ｂ１１上へ、蓋本体１を載せ、図４に示すよう
に開口片２が蓋外面に凸状なるボタンを形成するように
皮膜温度１００℃の温間加工条件で押し戻し加工を行っ
た。このようにして成形加工された易開缶蓋は、加熱炉
において、樹脂皮膜温度１５０℃で２分間熱処理され
た。When a steel plate having a polyester resin coating on both surfaces 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. In addition,
The processing was performed by heating the mold and the raw material so that the coating temperature was 100 ° C. 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. Next, as shown in FIG. 3, the lid main body 1 is placed on the lower mold B11 having the convex portion 13 at the portion corresponding to the peripheral portion of the opening piece 2, and the opening piece 2 is placed on the outer surface of the lid as shown in FIG. Push-back processing was performed under warm processing conditions with a coating temperature of 100 ° C. so as to form a convex button. The easy-open can lid thus formed was heat-treated at a resin film temperature of 150 ° C. for 2 minutes in a heating furnace.
【００２５】本実施例における最薄部の鋼板厚みは３０
μになるように調整した。樹脂皮膜も鋼板同様に形成さ
れ、最薄部表面に残留した膜厚は両面とも約８μであっ
た。熱処理後の樹脂皮膜の結晶化度は２８％、伸びは７
０％であった。この熱処理後の易開缶蓋は、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。開缶性は良好であり、樹脂皮膜の通電値は
内面側０．２ｍＡ、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。In the present embodiment, the thickness of the steel sheet at the thinnest part is 30.
It was adjusted to be μ. The resin film was 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. After heat treatment, the resin film has a crystallinity of 28% and an elongation of 7
It was 0%. After the heat treatment, the easy-open can lid was subjected to an evaluation of the can open property and an electric current test for examining the degree of destruction of the resin film on the inner and outer surfaces of the can. The can openability was good, and the energization value of the resin film was 0.2 mA on the inner surface side and 0.4 mA on the outer surface side, which was sufficiently satisfactory for practical use. Further, no visually noticeable feather was observed around the cut end of the broken cutting guide groove.
【００２６】実施例２ 板厚０．１３０ｍｍ、硬度５４（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、全厚み１５μのポリエステル樹脂フィルムを該鋼板
の両面に積層した。積層された皮膜の結晶化度は６％で
あった。また、積層後に剥離して測定した皮膜の伸びは
２２０％であった。さらに、樹脂皮膜の結晶融解熱量は
１３Ｊｏｕｌ／ｇ、冷結晶温度は１１０℃、冷結晶化開
始温度は９３℃、ガラス転移点は６５℃、融点は２２０
℃であった。Example 2 The surface of a thin steel plate having a plate thickness of 0.130 mm and a hardness of 54 (H R30-T ) was subjected to electrotin plating 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 and drying with water, the steel sheet was heated to laminate a polyester resin film having a total thickness of 15 μ on both sides of the steel sheet. The crystallinity of the laminated coating was 6%. Further, the elongation of the film measured after peeling after lamination was 220%. Furthermore, the heat of crystal fusion of the resin film is 13 Joule / g, the cold crystallization temperature is 110 ° C., the cold crystallization start temperature is 93 ° C., the glass transition point is 65 ° C., and the melting point is 220.
° C.
【００２７】この両面に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０．０７ｍ
ｍである上下金型Ａ５，６を用いて、実施例１と同様に
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。
なお、加工は皮膜温度が８５℃となるように金型及び素
材を加熱して行った。次いで図３に示すように、開口片
２の周縁部に相当する部分に凸部１３を有する下金型Ｂ
１１上へ、蓋本体１を載せ、図４に示すように開口片２
が蓋外面に凸状なるボタンを形成するように皮膜温度８
５℃の温間加工条件で押し戻し加工を行った。When a steel plate having a resin coating on both sides is made into an easy-open can lid as shown in FIG. 1, the shoulder radius corresponds to 0.07 m as shown in FIG.
By using the upper and lower molds A5 and A6 having a diameter of m, the key portions of the lid body were pressed by a press in the same manner as in Example 1 to extrude a portion corresponding to the opening piece 2 upward.
The processing was carried out by heating the mold and the material so that the coating temperature was 85 ° C. Next, as shown in FIG. 3, a lower mold B having a convex portion 13 at a portion corresponding to the peripheral portion of the opening piece 2.
The lid main body 1 is placed on the opening 11, and as shown in FIG.
The film temperature 8 so that it forms a convex button on the outer surface of the lid.
Push-back processing was performed under warm processing conditions of 5 ° C.
【００２８】本実施例では、最薄肉部の鋼板厚みは２８
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約４μであった。上
記製蓋加工で作られた易開缶性蓋は、缶胴に巻締められ
た後に、赤外線加熱により、皮膜温度１０５℃で２０秒
間熱処理された。熱処理後の樹脂皮膜の結晶化度は２２
％、伸びは９１％であった。開缶性は問題なく良好であ
り、樹脂皮膜の通電値は内面側０．３ｍＡ、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。In the present embodiment, the thinnest portion has a steel plate thickness of 28.
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 4 μm. The easily openable lid made by the above lid-making process was wound around the can body and then heat-treated by infrared heating at a film temperature of 105 ° C. for 20 seconds. The crystallinity of the resin film after heat treatment is 22
%, And the elongation was 91%. The can openability was good without any 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 2 mA. Further, no visually noticeable feather was observed around the cut end of the broken cutting guide groove.
【００２９】実施例３ 板厚０．２００ｍｍ、硬度４９（ＨR30-T ）の薄鋼板の
表面に、０．０５ｇ／ｍ2 のＮｉをめっきし、さらに
１．０ｇ／ｍ2 のＳｎめっきを施し、次いでクロム酸を
主体とする処理浴中にて電解後処理を行い、金属クロム
１３ｍｇ／ｍ2 およびその上層に水和酸化クロム８ｍｇ
／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、厚み８７μｍ
のポリエステル樹脂フィルムを、熱硬化性ポリエステル
接着剤を介して該鋼板の両面に積層した。樹脂皮膜の全
厚みは９０μであった。積層された皮膜の結晶化度は８
％、結晶融解熱量は３１Ｊｏｕｌ／ｇであった。また、
積層後に剥離して測定した皮膜の伸びは３３０％で、冷
結晶化温度は１２５℃で、冷結晶化開始温度は１０１℃
で、融点は２２５℃であった。[0029] Example 3 thickness 0.200 mm, on the surface of the thin steel sheet hardness 49 (H R30-T), plated with Ni of 0.05 g / m 2, further Sn plating 1.0 g / m 2 After that, electrolysis post-treatment is performed in a treatment bath mainly containing chromic acid, and 13 mg / m 2 of metallic chromium and 8 mg of hydrated chromium oxide on the upper layer thereof.
A chromate film with / m 2 (as Cr) was formed. After washing and drying with water, this steel plate is heated to a thickness of 87 μm.
The polyester resin film of 1. was laminated on both sides of the steel sheet via a thermosetting polyester adhesive. The total thickness of the resin film was 90μ. Crystallinity of laminated film is 8
%, The heat of fusion of crystal was 31 Joul / g. Also,
The elongation of the film measured after peeling after lamination was 330%, the cold crystallization temperature was 125 ° C, and the cold crystallization start temperature was 101 ° C.
And the melting point was 225 ° C.
【００３０】この両面に樹脂皮膜を有する鋼板を、肩半
径が０．９ｍｍである上下金型Ａ５，６を用いて、図２
に示す押圧加工することにより、開口片２に相当する部
分が蓋外面に凸状となるように上方に押出し成形した。
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。薄肉の切断案内線４が形成される。この
後、切断案内線の近傍は、赤外線によって、樹脂皮膜温
度２００℃で１０秒間熱処理された。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 0.9 mm as shown in FIG.
By pressing as shown in (1), the portion corresponding to the opening piece 2 was extruded upward so that the outer surface of the lid was convex.
At this time, the peripheral portion of the opening piece 2, the lid body 1 and the connecting piece 7 were processed so as to form a thin portion having a smooth plate thickness change by pressing. A thin cutting guide wire 4 is formed. After that, the vicinity of the cutting guide wire was heat-treated by infrared rays at a resin film temperature of 200 ° C. for 10 seconds.
【００３１】なお、本実施例では、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１
６μであった。熱処理後の樹脂皮膜の結晶化度は２９
％、伸びは５２％であった。開缶性は良好であり、樹脂
皮膜の通電値は内面側０．１ｍＡ、外面側０．１ｍＡ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。In this embodiment, the thickness of the steel plate at the thinnest portion was adjusted to 55 μm. The resin film is also formed like a steel plate, and the film thickness remaining on the surface of the thinnest part is about 1 on both sides.
It was 6μ. The crystallinity of the resin film after heat treatment is 29
%, And the elongation was 52%. The can openability was good, and the energization value of the resin coating was 0.1 mA on the inner surface side and 0.1 mA on the outer surface side, which was sufficiently satisfactory for practical use. Further, no visually noticeable feather was observed around the cut end of the broken cutting guide groove.
【００３２】実施例４ 板厚０．１００ｍｍ、硬度５９（ＨR30-T ）の薄鋼板の
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１１０ｍｇ／ｍ2 およびその上層に
水和酸化クロム１５ｍｇ／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２２μで下層が厚み３μであり、下
層樹脂は上層樹脂より低融点で全厚み２５μの樹脂フィ
ルムを該鋼板の両面に積層した。積層された皮膜の結晶
化度は８％であった。また、積層後に剥離して測定した
皮膜の伸びは２４０％であった。さらに、樹脂皮膜の結
晶融解熱量は２９Ｊｏｕｌ／ｇ、冷結晶温度は１３２
℃、冷結晶化開始温度は１１５℃、ガラス転移点は７１
℃、融点は２３１℃であった。Example 4 The surface of a thin steel plate having a plate thickness of 0.100 mm and a hardness of 59 (H R30-T ) was subjected to an electrolysis post-treatment in a treatment bath mainly containing chromic acid to obtain metal chromium of 110 mg / m 2 And a chromate film having 15 mg / m 2 of hydrated chromium oxide (as Cr) was formed on the upper layer thereof. After being washed and dried, this steel sheet is heated to form a two-layer polyester resin having different melting points. The upper layer has a thickness of 22μ and the lower layer has a thickness of 3μ, and the lower layer resin has a lower melting point than the upper layer resin and a total thickness of 25μ. Was laminated on both sides of the steel plate. The crystallinity of the laminated coating was 8%. The elongation of the film measured after peeling after lamination was 240%. Furthermore, the heat of crystal fusion of the resin film is 29 Joule / g, and the cold crystal temperature is 132.
℃, cold crystallization start temperature is 115 ℃, glass transition point is 71
C., melting point was 231.degree.
【００３３】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、開口片の現状寸法と対応し、肩
半径が０．３ｍｍである上下金型Ａ５，６をもって蓋本
体の所要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。なお、
加工は皮膜温度が１１５℃となるように金型及び素材を
加熱して行った。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。次いで図３に示すよう
に、開口片２の周縁部に相当する部分に凸部１３を有す
る下金型Ｂ１１上へ、蓋本体１を載せ、図４に示すよう
に開口片２が蓋外面に凸状なるボタンを形成するように
皮膜温度１１５℃の温間加工条件で押し戻し加工を行っ
た。このようにして成形加工された易開缶蓋は、加熱炉
において、樹脂皮膜温度２２０℃で３０秒間熱処理され
た。When a steel plate having a polyester resin coating on both sides thereof is used to prepare an easy-open can lid as shown in FIG. 1, the shoulder radius corresponds to the present dimension of the opening piece as shown in FIG. The upper and lower molds A5 and A6 having a size of 3 mm were used to press the required parts of the lid main body with a press to extrude a portion corresponding to the opening piece 2 upward. In addition,
The processing was performed by heating the mold and the material so that the coating temperature was 115 ° C. 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. Next, as shown in FIG. 3, the lid main body 1 is placed on the lower mold B11 having the convex portion 13 at the portion corresponding to the peripheral portion of the opening piece 2, and the opening piece 2 is placed on the outer surface of the lid as shown in FIG. Pushback processing was performed under warm processing conditions with a film temperature of 115 ° C. so as to form a convex button. The easy-open can lid thus formed was heat-treated at a resin film temperature of 220 ° C. for 30 seconds in a heating furnace.
【００３４】本実施例における最薄部の鋼板厚みは３５
μｍ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９μｍ
であった。熱処理後の樹脂皮膜の結晶化度は３１％、伸
びは３５％であった。開缶性は良好であり、樹脂皮膜の
通電値は内面側０．２ｍＡ、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。In the present embodiment, the thinnest part has a steel plate thickness of 35.
It was adjusted to be μm. The resin film is also formed like a steel plate, and the film thickness remaining on the surface of the thinnest part is about 9 μm on both sides.
Met. After the heat treatment, the resin film had a crystallinity of 31% and an elongation of 35%. The can openability was good, and the energization value of the resin film was 0.2 mA on the inner surface side and 0.3 mA on the outer surface side, which was sufficiently satisfactory for practical use. Further, no visually noticeable feather was observed around the cut end of the broken cutting guide groove.
【００３５】実施例５ 実施例１と同一の樹脂被覆鋼板を実施例１と同一金型を
用い、樹脂皮膜温度６５℃なる温間条件で同様の加工を
行い、その後、実施例１と同一の熱処理を行った。本比
較例では、最薄肉部の鋼板厚みは３０μ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８μであった。熱処理後の樹脂皮膜
の結晶化度は２８％、伸びは７０％であった。樹脂皮膜
の通電値は内面側０．６ｍＡ、外面側０．７ｍＡで実用
的に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。Example 5 The same resin-coated steel sheet as in Example 1 was processed by using the same mold as in Example 1 under the warm condition that the resin film temperature was 65 ° C., and then the same as in Example 1. Heat treatment was performed. In this comparative example, the thickness of the steel plate at the thinnest portion was adjusted to 30 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 8μ. After the heat treatment, the resin film had a crystallinity of 28% and an elongation of 70%. The energization value of the resin film was 0.6 mA on the inner surface side and 0.7 mA on the outer surface side, which were practically satisfactory. Further, no visually noticeable feather was observed around the cut end of the broken cutting guide groove.
【００３６】実施例６ 実施例１と同一の樹脂被覆鋼板を実施例１と同一金型を
用い、樹脂皮膜温度１３５℃なる温間条件で同様の加工
を行い、その後、実施例１と同一の熱処理を行った。本
比較例では、最薄肉部の鋼板厚みは３０μ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
面では樹脂皮膜の破断が見られた。熱処理後の樹脂皮膜
の結晶化度は２６％、伸びは６０％であった。樹脂皮膜
の通電値は内面側０．８ｍＡ、外面側０．９ｍＡで実用
的に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。Example 6 The same resin-coated steel sheet as in Example 1 was processed by using the same mold as in Example 1 under the warm condition that the resin film temperature was 135 ° C., and then the same as in Example 1. Heat treatment was performed. In this comparative example, the thickness of the steel plate at the thinnest portion was adjusted to 30 μ. The resin film was also formed similarly to the steel plate, and fracture of the resin film was observed on the surface of the thinnest part. After the heat treatment, the resin film had a crystallinity of 26% and an elongation of 60%. The energization value of the resin film was 0.8 mA on the inner surface side and 0.9 mA on the outer surface side, which was practically satisfactory. Further, no visually noticeable feather was observed around the cut end of the broken cutting guide groove.
【００３７】比較例１ 実施例１と同一のめっき鋼板上に、厚み８μｍのポリエ
ステル樹脂フィルムを該鋼板の両面に積層した。積層さ
れた皮膜の結晶化度は６％であった。さらに、積層後に
剥離して測定した皮膜の伸びは２２０％、樹脂皮膜の結
晶融解熱量は１３Ｊｏｕｌ／ｇ、冷結晶温度は１１０
℃、冷結晶化開始温度は９３℃、ガラス転移点は６５
℃、融点は２２０℃であった。この両面に樹脂皮膜を有
する鋼板を、実施例１と同一金型を用い、実施例２と同
一の加工、熱処理を行った。本実施例では、最薄肉部の
鋼板厚みは４８μになるように調整した。熱処理後の樹
脂皮膜の結晶化度は２２％、伸びは９１％であった。問
題なく開缶された、樹脂皮膜の通電値は内面側１０３ｍ
Ａ、外面側１１３ｍＡ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。Comparative Example 1 On the same plated steel sheet as in Example 1, a polyester resin film having a thickness of 8 μm was laminated on both sides of the steel sheet. The crystallinity of the laminated coating was 6%. Further, the film elongation measured by peeling after lamination is 220%, the heat of crystal fusion of the resin film is 13 Joule / g, and the cold crystal temperature is 110.
℃, cold crystallization start temperature 93 ℃, glass transition point 65
The melting point was 220 ° C. The steel plate having the resin coating on both surfaces was subjected to the same working and heat treatment as in Example 2 using the same mold as in Example 1. In this example, the thickness of the steel plate at the thinnest portion was adjusted to be 48μ. After the heat treatment, the resin film had a crystallinity of 22% and an elongation of 91%. When the can was opened without problems, the energization value of the resin film was 103m on the inner surface
A, 113 mA on the outer surface side showed a very large value, and many defects were observed in the resin film of the cutting guide portion, which was not practically usable.
【００３８】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３７μ、下
層が厚み３μで、下層樹脂は上層樹脂より低融点なる全
厚み４０μの樹脂フィルムを該鋼板の両面に積層した。
積層された皮膜の結晶化度は１３％であった。また、積
層後に剥離して測定した皮膜の伸びは２１０％、冷結晶
温度は１３０℃、冷結晶化開始温度は１１０℃、融点は
２３０℃、結晶融解熱量は２８Ｊｏｕｌ／ｇであった。
この両面に樹脂皮膜を有する鋼板を、実施例１と同一金
型を用い、実施例１と同様の温間加工、熱処理を行っ
た。本比較例では、最薄肉部の鋼板厚みは４８μになる
ように調整した。熱処理後の樹脂皮膜の結晶化度は２６
％、伸びは６０％であった。問題なく開缶された、樹脂
皮膜の通電値は内面側１０５ｍＡ、外面側１１０ｍＡ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。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 37 μ, the lower layer had a thickness of 3 μ, and the lower resin had a lower melting point than the upper resin. A resin film having a thickness of 40 μ was laminated on both sides of the steel plate.
The crystallinity of the laminated coating was 13%. The elongation of the film measured by peeling after lamination was 210%, the cold crystallization temperature was 130 ° C, the cold crystallization start temperature was 110 ° C, the melting point was 230 ° C, and the heat of crystal fusion was 28 Joul / g.
The same steel plate having resin coatings on both sides was subjected to the same warm working and heat treatment as in Example 1, using the same mold as in Example 1. In this comparative example, the thickness of the steel plate at the thinnest portion was adjusted to 48 μ. The crystallinity of the resin film after heat treatment is 26
%, The elongation was 60%. The resin coating, which was opened without problems, showed a very large current value at the inner surface side of 105 mA and the outer surface side of 110 mA, and many defects were found in the resin film at the cutting guide part, so it can be used practically. There wasn't.
【００３９】比較例３ 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３７μ、下
層が厚み３μで、下層樹脂は上層樹脂より低融点なる全
厚み４０μの樹脂フィルムを該鋼板の両面に積層した。
積層された皮膜の結晶化度は９％であった。また、積層
後に剥離して測定した皮膜の伸びは１８０％、冷結晶温
度は１３０℃、冷結晶化開始温度は１１０℃、融点は２
３０℃、結晶融解熱量は２８Ｊｏｕｌ／ｇであった。こ
の両面に樹脂皮膜を有する鋼板を、実施例１と同一金型
を用い、実施例１と同様の温間加工、熱処理を行った。
本比較例では、最薄肉部の鋼板厚みは３０μになるよう
に調整した。熱処理後の樹脂皮膜の結晶化度は３６％、
伸びは５０％であった。問題なく開缶された、樹脂皮膜
の通電値は内面側９４ｍＡ、外面側８７ｍＡ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。Comparative Example 3 On the same plated steel sheet as in Example 1, a two-layer structure polyester resin having different melting points was used. The upper layer had a thickness of 37 μ, the lower layer had a thickness of 3 μ, and the lower layer resin had a lower melting point than the upper layer resin. A resin film having a thickness of 40 μ was laminated on both sides of the steel plate.
The crystallinity of the laminated coating was 9%. Further, the elongation of the film measured by peeling after lamination was 180%, the cold crystallization temperature was 130 ° C, the cold crystallization start temperature was 110 ° C, and the melting point was 2 ° C.
The heat of fusion of crystal at 30 ° C. was 28 Joul / g. The same steel plate having resin coatings on both sides was subjected to the same warm working and heat treatment as in Example 1, using the same mold as in Example 1.
In this comparative example, the thickness of the steel plate at the thinnest portion was adjusted to 30 μ. The crystallinity of the resin film after heat treatment is 36%,
The elongation was 50%. When the resin film was opened without problems, the energization value of the resin film was extremely large at 94 mA on the inner surface and 87 mA on the outer surface, and many defects were found in the resin film at the cutting guide part, so it can be used practically. There wasn't.
【００４０】比較例４ 実施例１と同一のめっき鋼板上に、全厚み８μの樹脂フ
ィルムを該鋼板の両面に積層した。積層された皮膜の結
晶化度は４％であった。また、積層後に剥離して測定し
た皮膜の伸びは２２０％であった。さらに、樹脂皮膜の
結晶融解熱量は８Ｊｏｕｌ／ｇ、冷結晶温度は１１０
℃、冷結晶化開始温度は９３℃、ガラス転移点は６５
℃、融点は２２０℃であった。この両面に樹脂皮膜を有
する鋼板を、実施例１と同一金型を用い、実施例１と同
一の温間加工を行い、その後、実施例１と同一の熱処理
を行った。本比較例では、最薄肉部の鋼板厚みは３０μ
になるように調整した。最薄肉部表面では樹脂皮膜の一
部に破断が見られた。熱処理後の樹脂皮膜の結晶化度は
２４％、伸びは７２％であった。樹脂皮膜の通電値は内
面側４５．６ｍＡ、外面側４７．４ｍＡで大きな値を示
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。Comparative Example 4 On the same plated steel sheet as in Example 1, a resin film having a total thickness of 8 μ was laminated on both sides of the steel sheet. The crystallinity of the laminated coating was 4%. Further, the elongation of the film measured after peeling after lamination was 220%. Furthermore, the heat of crystal fusion of the resin film is 8 Joule / g, and the cold crystal temperature is 110.
℃, cold crystallization start temperature 93 ℃, glass transition point 65
The melting point was 220 ° C. The steel plate having the resin coating on both surfaces was subjected to the same warm working as in Example 1 using the same mold as in Example 1, and then subjected to the same heat treatment as in Example 1. In this comparative example, the steel plate thickness of the thinnest part is 30 μm.
I adjusted it to be. On the surface of the thinnest part, a part of the resin film was fractured. After the heat treatment, the resin film had a crystallinity of 24% and an elongation of 72%. The energization value of the resin film was large at 45.6 mA on the inner surface side and 47.4 mA on the outer surface side, and many defects were observed in the resin film of the cutting guide portion, which was not practically usable.
【００４１】比較例５ 実施例１と同一の樹脂被覆鋼板を肩半径が０．０３ｍｍ
である上下金型Ａ５，６を用いて、実施例１と同一の温
間加工を行い、その後、実施例１と同一の熱処理を行っ
た。本比較例では、最薄肉部の鋼板厚みは３０μになる
ように調整した。熱処理後の樹脂皮膜の結晶化度は２６
％、伸びは６０％であった。樹脂皮膜の通電値は内面側
５０．６ｍＡ、外面側６８．４ｍＡ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。Comparative Example 5 The same resin-coated steel sheet as in Example 1 was used and the shoulder radius was 0.03 mm.
Using the upper and lower dies A5 and A6, the same warm working as in Example 1 was performed, and then the same heat treatment as in Example 1 was performed. In this comparative example, the thickness of the steel plate at the thinnest portion was adjusted to 30 μ. The crystallinity of the resin film after heat treatment is 26
%, The elongation was 60%. The energization value of the resin film was very large at 50.6 mA on the inner surface side and 68.4 mA on the outer surface side, and many defects were found in the resin film of the cutting guide portion, which was not practically usable.
【００４２】比較例６ 実施例１と同一の樹脂被覆鋼板を肩半径が１．２ｍｍで
ある上下金型Ａ５，６を用いて、実施例１と同一の温間
加工を行い、その後、実施例１と同一の熱処理を行っ
た。本比較例では、最薄肉部の鋼板厚みは３０μになる
ように調整した。最薄肉部表面に残留した膜厚は約８μ
であった。熱処理後の樹脂皮膜の結晶化度は２８％、伸
びは７０％であった。樹脂皮膜の通電値は内面側２６．
８ｍＡ、外面側２２．３ｍＡで大きな値を示し、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。Comparative Example 6 The same resin-coated steel sheet as in Example 1 was subjected to the same warm working as in Example 1 by using the upper and lower molds A5 and A6 having a shoulder radius of 1.2 mm, and then the example. The same heat treatment as in 1 was performed. In this comparative example, the thickness of the steel plate at the thinnest portion was adjusted to 30 μ. The film thickness remaining on the surface of the thinnest part is about 8μ
Met. After the heat treatment, the resin film had a crystallinity of 28% and an elongation of 70%. The energization value of the resin film is 26.
A large value was obtained at 8 mA and 22.3 mA on the outer surface side, and many defects were recognized in the resin film of the cutting guide portion, which was not practically usable.
【００４３】比較例７ 実施例１と同一の樹脂被覆鋼板を実施例１と同一の金型
を用い、同一の温間条件で同様の加工を行い、その後、
１０８℃で２ｍｉｎ熱処理を行った。本比較例では、最
薄肉部の鋼板厚みは３０μ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８μであった。熱処理後の樹脂皮膜の結晶化度は
３％、伸びは３１０％であった。樹脂皮膜の通電値は内
面側０．２ｍＡ、外面側０．４ｍＡで開缶性は良好であ
ったが、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。Comparative Example 7 The same resin-coated steel sheet as in Example 1 was subjected to the same processing under the same warm conditions using the same mold as in Example 1, and thereafter,
Heat treatment was performed at 108 ° C. for 2 minutes. In this comparative example, the thickness of the steel plate at the thinnest portion was adjusted to 30 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 8μ. After the heat treatment, the resin film had a crystallinity of 3% and an elongation of 310%. The resin coating had a current-carrying value of 0.2 mA on the inner surface and 0.4 mA on the outer surface, and the can openability was good, but there was a large amount of film residue around the cut guide groove that was broken during opening, and the appearance was poor. It gave a pleasant feeling, and the problem of practicality remained.
【００４４】比較例８ 実施例１と同一の樹脂被覆鋼板を実施例１と同一金型を
用い、実施例１と同一温間条件で同一加工を行い、熱風
加熱により、皮膜温度２４０℃となるように１０秒間熱
処理を行った。本比較例では、最薄肉部の鋼板厚みは３
０μ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８μであった。
熱処理後の樹脂皮膜の結晶化度は３５％、伸びは５０％
であった。熱風により加熱された皮膜部分が黄色を帯
び、実用性に問題が残った。Comparative Example 8 The same resin-coated steel sheet as in Example 1 was used in the same mold as in Example 1 under the same warm conditions as in Example 1, and the coating temperature was 240 ° C. by heating with hot air. Thus, heat treatment was performed for 10 seconds. In this comparative example, the thinnest part has a steel plate thickness of 3
It was adjusted to be 0 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 8μ.
Crystallinity of resin film after heat treatment is 35%, elongation is 50%
Met. The film portion heated by hot air became yellowish, leaving a problem in practicality.
【００４５】比較例９ 実施例１と同一の樹脂被覆鋼板を実施例１と同一金型を
用い、同一の温間条件で同様の加工を行い、その後同一
の熱処理を行った。本比較例では、最薄肉部の鋼板厚み
は７０μになるように調整した。指で開缶することがで
きず、実用的に使用できるものでなかった。Comparative Example 9 The same resin-coated steel sheet as in Example 1 was subjected to the same processing under the same warm conditions using the same mold as in Example 1, and then subjected to the same heat treatment. In this comparative example, the thickness of the steel plate at the thinnest portion was adjusted to 70 μm. I could not open the can with my fingers and it was not practically usable.
【００４６】[0046]
【発明の効果】以上述べたごとく、本発明による押しボ
タン型易開缶性蓋の製造方法は、樹脂フィルムを鋼板ラ
ミネートして得られる素材を使用して、尖鋭刃を使用し
ない押圧加工を温間で行うこと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。さら
に、切断案内溝の成形加工後に熱処理を行うことにより
フェザー性の良好な易開缶性蓋を製造することが可能と
なる。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により、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
ことが可能であることはもとより、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。As described above, the method for manufacturing a push-button type easy-open lid according to the present invention uses a material obtained by laminating a resin film on a steel plate and uses a pressing process that does not use a sharp blade. By adopting the method of forming the cutting guide groove by the thin portion forming method by performing between
In the manufacturing process, it is possible to completely eliminate the problems of the tool life for processing, the concern about corrosion resistance, etc. Furthermore, by performing a heat treatment after forming the cutting guide groove, it becomes possible to manufacture an easily openable lid having a good feathering property. If the steel easy-open can lid is put into practical use, it will be possible to make it into a "monometal can", and it will be possible to provide the market with products that are suitable for recycling in response to recent global environmental problems. It goes without saying that the steel sheet itself is highly economical, and by making both the can body and the can lid of steel sheet, it is expected to be a product that is more economical and is easy to reuse as a resource.
【図１】本発明により形成された押しボタン型易開缶性
蓋の図、FIG. 1 is a view of a push-button type easy-open can lid formed according to the present invention,
【図２】本発明の実施要領を工程順に示す縦断面図、FIG. 2 is a vertical cross-sectional view showing the procedure of the present invention in the order of steps,
【図３】本発明の実施要領を工程順に示す縦断面図、FIG. 3 is a vertical cross-sectional view showing the procedure of the present invention in process order.
【図４】本発明の実施要領を工程順に示す縦断面図、FIG. 4 is a vertical cross-sectional view showing the procedure of the present invention in process order.
【図５】従来の尖鋭刃の押圧方式による断面Ｖ字型の切
断案内溝を示す図である。FIG. 5 is a view showing a cutting guide groove having a V-shaped cross section according to a conventional pressing method of a sharp blade.
１ 蓋本体 ２ 開口片 ３ 切断案内溝 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 1 0 上金型Ｂ 1 1 下金型Ｂ 1 2 金型凹部 1 3 金型凸部 1 Lid body 2 Opening piece 3 Cutting guide groove 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 1 0 Upper mold B 1 1 Lower mold B 1 2 Mold concave part 1 3 Mold convex part
Claims (4)
成用の肩半径が０．０５〜１．０ｍｍである上下金型
で、厚さ１０〜１００μｍ、伸び２００％以上、結晶化
度１０％以下、結晶融解熱１０Ｊｏｕｌ／ｇ以上の結晶
性飽和ポリエステル系樹脂皮膜を両面に有する鋼板を押
圧加工成形し、加工最薄部の鋼板厚みを加工前鋼板厚み
の４０％以下とし、切断案内溝を形成することを特徴と
する熱可塑性樹脂ラミネート鋼板製押しボタン型易開缶
性蓋の製造方法。1. An upper and lower mold having a shoulder radius of 0.05 to 1.0 mm for forming a cutting guide groove forming one edge of an opening of a can lid, having a thickness of 10 to 100 μm, an elongation of 200% or more, and crystallization. The steel plate having a crystalline saturated polyester resin film with a degree of crystal fusion of 10% or less and a heat of crystal fusion of 10 Joule / g or more is press-formed, and the thickness of the thinnest part is set to 40% or less of the steel plate thickness before processing, and the cutting is performed. A method for manufacturing a push button type easy-open lid made of a thermoplastic resin laminated steel sheet, characterized by forming a guide groove.
成用の肩半径が０．０５〜１．０ｍｍである上下金型
で、厚さ１０〜１００μｍ、伸び２００％以上、結晶化
度１０％以下、結晶融解熱１０Ｊｏｕｌ／ｇ以上の結晶
性飽和ポリエステル系樹脂皮膜を両面に有する鋼板を押
圧加工成形し、加工最薄部の鋼板厚みを加工前鋼板厚み
の４０％以下とし、さらに押し戻し加工を行って切断案
内溝を形成することを特徴とする熱可塑性樹脂ラミネー
ト鋼板製押しボタン型易開缶性蓋の製造方法。2. An upper and lower mold having a shoulder radius of 0.05 to 1.0 mm for forming a cutting guide groove forming one edge of an opening of a can lid, and having a thickness of 10 to 100 μm, an elongation of 200% or more, and crystallization. A steel sheet having a crystalline saturated polyester resin film with a degree of crystal fusion of 10 Joule / g or more and a heat of crystal fusion of 10% or less is press-formed, and the steel sheet thickness at the thinnest processing portion is 40% or less of the steel sheet thickness before processing. A method for manufacturing a push button type easily openable lid made of a thermoplastic resin laminated steel plate, which comprises performing a pushback process to form a cutting guide groove.
テル系樹脂皮膜のガラス転移点温度〜冷結晶化温度で行
うことと、少なくとも切断案内溝周辺部の樹脂皮膜を該
樹脂皮膜の冷結晶化開始温度〜融点の温度に加熱熱処理
することの、少なくとも一方を行うことを特徴とする請
求項１記載の熱可塑性樹脂ラミネート鋼板押しボタン型
易開缶性蓋の製造方法。3. Press-molding is carried out at a glass transition temperature to a cold crystallization temperature of the crystalline saturated polyester resin film, and at least a resin film in the periphery of the cutting guide groove is cold-crystallized to start the resin film. The method for producing a thermoplastic resin-laminated steel plate push-button type easily openable lid according to claim 1, wherein at least one of heat treatment and heat treatment at a temperature between a temperature and a melting point is performed.
は両方を前記結晶性飽和ポリエステル系樹脂皮膜のガラ
ス転移点温度〜冷結晶化温度で行うことと、少なくとも
切断案内溝周辺部の樹脂皮膜を該樹脂皮膜の冷結晶化開
始温度〜融点の温度に加熱熱処理することの、少なくと
も一方を行うことを特徴とする請求項２記載の熱可塑性
樹脂ラミネート鋼板製押しボタン型易開缶性蓋の製造方
法。4. One or both of press forming and push back processing is performed at a glass transition temperature to a cold crystallization temperature of the crystalline saturated polyester resin film, and at least the resin film around the cutting guide groove is formed. At least one of heating and heat-treating from the cold crystallization start temperature of a resin film to the temperature of a melting point is performed, At least one is performed, The manufacturing method of the push button type easy opening lid made from a thermoplastic resin laminated steel plate of Claim 2 characterized by the above-mentioned. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7033247A JPH08224628A (en) | 1995-02-22 | 1995-02-22 | Production of cap of push button type east can opening ability of thermoplastic laminate steel sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7033247A JPH08224628A (en) | 1995-02-22 | 1995-02-22 | Production of cap of push button type east can opening ability of thermoplastic laminate steel sheet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08224628A true JPH08224628A (en) | 1996-09-03 |
Family
ID=12381160
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7033247A Withdrawn JPH08224628A (en) | 1995-02-22 | 1995-02-22 | Production of cap of push button type east can opening ability of thermoplastic laminate steel sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08224628A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004074749A (en) * | 2002-08-22 | 2004-03-11 | Mitsubishi Materials Corp | Laminate material and laminated can lid |
| JP2004082214A (en) * | 2002-06-27 | 2004-03-18 | Sumitomo Metal Ind Ltd | Joining raw material, method for manufacturing the same, joined articles and method for manufacturing the same |
| CN111112492A (en) * | 2019-12-31 | 2020-05-08 | 福建金锐达金属包装有限公司 | Slotting process for producing tinplate tank cover |
-
1995
- 1995-02-22 JP JP7033247A patent/JPH08224628A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004082214A (en) * | 2002-06-27 | 2004-03-18 | Sumitomo Metal Ind Ltd | Joining raw material, method for manufacturing the same, joined articles and method for manufacturing the same |
| JP2009255179A (en) * | 2002-06-27 | 2009-11-05 | Sumitomo Metal Ind Ltd | Material for welding, weld product and automobile body |
| JP2004074749A (en) * | 2002-08-22 | 2004-03-11 | Mitsubishi Materials Corp | Laminate material and laminated can lid |
| CN111112492A (en) * | 2019-12-31 | 2020-05-08 | 福建金锐达金属包装有限公司 | Slotting process for producing tinplate tank cover |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101167874B1 (en) | Laminate steel sheet for two-piece can body, two-piece can body made of laminate steel sheet, and method for production of the two-piece can body | |
| EP1914024B1 (en) | Method for manufacturing a can body for a two-piece can made of laminate steel sheet | |
| JP4692147B2 (en) | Two-piece can manufacturing method and two-piece laminated can | |
| JP5186772B2 (en) | Two-piece can manufacturing method and two-piece laminated can | |
| JPH08224628A (en) | Production of cap of push button type east can opening ability of thermoplastic laminate steel sheet | |
| US5348809A (en) | Sheet steel easy open can lid superior in can openability and not requiring repair coating of inner and outer surfaces | |
| JP2791842B2 (en) | Easy-to-open lid made of steel plate with no repair on the inside and outside with excellent openability | |
| JP3043193B2 (en) | Laminated steel plate for easy-opening lid with excellent openability, corrosion resistance and feathering properties | |
| JP6289914B2 (en) | Resin film for metal plate lamination, resin laminated metal plate, container and container lid using the same | |
| EP0415345B1 (en) | Composite steel sheet having high workability for drawn and ironed cans | |
| WO1994014552A1 (en) | Method of manufacturing easily openable can lids of resin laminated metal plate, easily openable can lid, and resin laminated metal plate for easily openable can lids | |
| JP4103974B2 (en) | Polyester resin-coated aluminum seamless can and method for producing the same | |
| JP3153055B2 (en) | Method of manufacturing resin-laminated metal easy-opening lid material excellent in feather property | |
| JP3986170B2 (en) | Polyester resin-coated aluminum seamless can and method for producing the same | |
| JP2791841B2 (en) | Easy-to-open lid made of steel plate with excellent openability and no need for inner and outer surface repair painting | |
| JPH06115546A (en) | Easily openable can lid made of internal and external surface non-touch-up type steel plate with excellent can opening property and appropriate degree of process | |
| JP2015134875A5 (en) | ||
| JPH04105931A (en) | Composite steel plate for eoe and preparation thereof | |
| JPH09108756A (en) | Manufacture of easily openable can lid having excellent can operanability without necessitating repair coating | |
| JP2013249138A (en) | Easy-open can lid made of resin-coated steel sheet and method of manufacturing the same | |
| JP4894457B2 (en) | Laminated steel sheet for aerosol 2-piece can body, method for producing aerosol 2-piece can body, and aerosol 2-piece can | |
| JP2010013168A (en) | Easy-open can lid made of resin-coated steel plate and its manufacturing method | |
| JPH06183443A (en) | Easily openable lid prominet in easy-openability corrosion resistance and feather degree | |
| JPH0899140A (en) | Manufacture of easily opening can cover by warm working | |
| JPH06170472A (en) | Manufacture of lid easy to open |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Application deemed to be withdrawn because no request for examination was validly filed |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20020507 |