JP3018049B2 - Method for manufacturing easy-open can lid with no repair on inner and outer surfaces using resin laminated steel sheet - Google Patents
Method for manufacturing easy-open can lid with no repair on inner and outer surfaces using resin laminated steel sheetInfo
- Publication number
- JP3018049B2 JP3018049B2 JP3293420A JP29342091A JP3018049B2 JP 3018049 B2 JP3018049 B2 JP 3018049B2 JP 3293420 A JP3293420 A JP 3293420A JP 29342091 A JP29342091 A JP 29342091A JP 3018049 B2 JP3018049 B2 JP 3018049B2
- Authority
- JP
- Japan
- Prior art keywords
- thickness
- lid
- steel sheet
- resin film
- 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.)
- Expired - Fee Related
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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Containers Having Bodies Formed In One Piece (AREA)
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
きる鋼板製易開缶蓋の製造方法に関するものであり、本
発明により製造される鋼板製易開缶蓋は飲料缶あるいは
一般食缶その他の幅広い用途に使用される。The present invention relates to is a method of manufacturing a metal container closure, in particular a part of the can lid or nearly steel easy Hirakikanfuta the entire surface thereof can be easily opened by hand, the
The easy-open can made of steel plate manufactured according to the present invention is used for beverage cans, general food cans, and a wide variety of other uses.
【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-open can lid, which can easily open a part or substantially the entire surface of a container lid by hand, is of a tear-off type in which a handle and an opening piece are torn off and separated from a can body, and both a handle and an opening piece are opened. A stay-on tub method that remains fixed to the can body after the can has been put to practical use. In either system, most easy-open can lids are manufactured from aluminum plates for manufacturing technology reasons, and steel plates are currently used for some limited applications.
【０００３】従来技術の代表例としては、塗装されたア
ルミニウム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載せ、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、断面Ｖ字形の切断
案内溝（図５）で囲まれる開口片形状を形成していた。[0003] As a typical example of the prior art, a coated aluminum 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 mold, and has a required contour shape from the upper surface thereof. By pressing the sharp blade and cutting the blade into the lid main body, an opening piece shape surrounded by a cutting guide groove having a V-shaped cross section (FIG. 5) has been formed.
【０００４】鋼材そのものは強度が高いことを基本的特
徴としており、人手により容易に開口できる程度の切断
案内溝を形成するには、加工前板厚の半分〜２／３程度
に達する尖鋭刃の激しい押圧が必要とされている。この
切断案内溝の深さは、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。[0004] The basic feature of the steel material itself is its high strength. In order to form a cutting guide groove that can be easily opened manually, a sharp blade having a thickness of about half to 2/3 of the plate thickness before processing is required. Intense pressing is needed. When the depth of the cutting guide groove is too shallow, the can opening property is poor, and when the depth is too deep, the impact strength against external shocks is insufficient. Therefore, 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な鋼板の場合、工
具寿命が保たれないという欠点があった。また、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とい
う欠点があった。[0005] Therefore, although a considerable accuracy is required for a working tool, there is a drawback that the tool life cannot be maintained in the case of a steel plate which requires a sharp pressing of a sharp blade. In addition, in order to ensure corrosion resistance to the contents or to prevent the occurrence of rust on the outer surface, it is necessary to repair and coat a portion where the metal surface is exposed by processing the cutting guide groove. As measures for extending the tool life, Japanese Patent Application Laid-Open Nos. Sho 55-70434 and
As disclosed in Japanese Patent Publication No. 175034 and the like, a method of forming a cutting guide groove by composite extrusion has been proposed.
This known method was premised on the use of steel sheets, and was an effective measure for extending tool life,
Since the cross-sectional structure of the cutting guide groove is complicated, the coating does not spread to all parts in the cutting guide groove by the ordinary spray coating method, and there is a defect that sufficient corrosion resistance cannot be obtained even when repair painting is performed.
【０００６】[0006]
【発明が解決しようとする課題】尖鋭刃を使用する従来
技術には、その素材としてアルミニウムがその特性上好
ましいものとされ、鋼板を素材とするものは極めて限定
された用途にしか使用されていないのは前述の通りであ
る。その理由は主として、尖鋭刃の激しい押圧に対し
鋼板の抵抗力が強く、加工用工具寿命が非常に短いこ
と、鋼板表面の塗膜が加工により破壊され、切断案内
溝全周あるいは取っ手かしめ部等に対し、補修塗装を必
要とすること、耐食性面での不安があること、等であ
った。In the prior art using a sharp blade, aluminum is considered to be preferable as a material thereof, and a material using a steel plate is used only for very limited applications. Is as described above. The main reasons are the strong resistance of the steel plate to the intense pressing of the sharp blade, the very short tool life, the breakage of the coating on the steel plate surface due to the processing, the entire circumference of the cutting guide groove or the swaged part of the handle, etc. On the other hand, it was necessary to apply repair painting, and there was concern about corrosion resistance.
【０００７】一方、近年の地球環境問題に対する認識の
高まりに対応して、リサイクルに適した商品への指向が
必要とされており、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”化が
重要視されている。現在、大半の金属缶には鋼板を素材
とする缶胴が使用されており、開缶性に優れ、内外面の
補修塗装が不要な、耐食性の優れた鋼板製易開缶蓋を、
生産性よく製造可能な方策の出現が熱望されているとこ
ろである。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。On the other hand, in response to the increasing awareness of global environmental issues in recent years, it has been required to focus on products suitable for recycling. Even in metal cans, the can body and can lid are formed of the same material. In addition, the importance of so-called “monometal cans” has been emphasized. At present, most metal cans use steel body cans, which have excellent openability and do not require repair painting of the inner and outer surfaces.
The emergence of measures that can be manufactured with high productivity has been eagerly awaited. Naturally, the steel sheet itself is excellent in economic efficiency, and it is expected that by using steel plates for both the can body and the can lid, the product will be more economical and easy to reuse as resources.
【０００８】[0008]
【課題を解決するための手段】本発明は、以上の課題を
一挙に解決するためになされたものであり、その要旨と
するところは下記のとおりである。（１） 破断伸び５０〜３００％、引張弾性率６０ｋｇ／
ｍｍ2 以上、厚み１０〜８０μｍの樹脂皮膜を両面に有
する樹脂積層鋼板を用い、開口片の周縁部に、最薄部厚
みが未加工部厚みの１／２以下である薄肉部をその主構
成要素とする切断案内溝を、複合押出し加工にて形成す
ることを特徴とする樹脂積層鋼板による内外面無補修化
易開缶蓋の製造方法。（２）前記複合押出し加工が、蓋本体１の開口片に相当
する部分を、最薄部となる連片７の板厚が加工前板厚の
１／２以下の厚さとなるよう上方あるいは下方に予備押
出し加工した後、上方あるいは下方に押出された加工部
を加工前のレベルに押戻し加工する複合押出し加工であ
ることを特徴とする前項（１）記載の樹脂積層鋼板によ
る内外面無補修化易開缶蓋の製造方法。 （３）前記予備押出し加工において、食い込み溝１６を
設けることを特徴とする前項（２）記載の樹脂積層鋼板
による内外面無補修化易開缶蓋の製造方法。 SUMMARY OF THE INVENTION The present invention has been made to solve the above problems at once, and the gist thereof is as follows . (1) Elongation at break 50-300%, tensile modulus 60 kg /
mm 2 or more, a resin laminate steel sheet having a resin film having a thickness of 10~80μm on both sides, on the periphery of the opening piece, the main constituent of the thin portion thinnest portion has a thickness of 1/2 or less of the unprocessed portion thickness the cutting guide groove of an element, be formed by a composite extrusion
Inner and outer surfaces free repair of easy Hirakikanfuta manufacturing method of a resin laminated steel plate, characterized in that that. (2) The composite extrusion corresponds to the opening piece of the lid body 1
The thickness of the connecting piece 7, which is the thinnest part, is the thickness before processing.
Pre-push upward or downward to a thickness of 1/2 or less
Processed part extruded upwards or downwards after extrusion processing
Extrusion process that pushes back to the level before processing.
The resin laminated steel sheet according to the above (1),
Method for manufacturing easy-to-repair can openable inner and outer can lids. (3) In the pre-extrusion process, the bite groove 16 is
The laminated steel sheet according to the above (2), which is provided.
Manufacturing method of easy-open can lid with no repair of inner and outer surface by using.
【０００９】以下に本発明を詳細に説明する。本発明に
使用される鋼板は、板厚ｔ0 ：０．１５０〜０．３００
ｍｍ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。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施し、クロメ
ート処理皮膜を介して、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。Hereinafter, the present invention will be described in detail. Steel sheet used in the present invention, the thickness t 0: 0.150 to .300
mm, having mechanical properties of hardness ( HR30T ): 54 to 68 and elongation: about 10 to 40%. On the surface of this steel sheet, Sn, Cr, Ni, Al,
A metal coating of one or more types of Zn is applied, and a resin film having excellent adhesion, workability, and corrosion resistance is laminated via a chromate-treated film to eliminate the need for repair coating after processing.
【００１０】具体的には、付着量０．５〜３．０ｇ／ｍ
2 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およびＮｉ付着量とし
て各々０．５〜２．０ｇ／ｍ 2 、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／ｍ2 の通常ＴＦＳ（Ｔｉ
ｎ Ｆｒｅｅ Ｓｔｅｅｌ）と呼ばれているクロム・ク
ロメート処理鋼板などである。[0010] Specifically, the adhesion amount is 0.5 to 3.0 g / m.
TwoTin-plated steel sheet subjected to chemical treatment after tin plating
0.3-2.0 g / mTwoConversion treatment after nickel plating
Nickel plated steel sheet, Sn and Ni adhesion amount
0.5 to 2.0 g / m each Two, 0.01-0.5 g /
mTwoIs subjected to a chemical conversion treatment after plating in the order of Ni and Sn
/ Ni plated steel sheet, metal Cr adhesion amount 50-200mg /
mTwo, Cr oxide 5-30 mg / mTwoNormal TFS (Ti
n Free Steel)
For example, a steel plate treated with a rote treatment.
【００１１】この表面処理鋼板の両面に、破断伸び５０
〜３００％、引張弾性率６０ｋｇ／ｍｍ2 以上、厚み１
０〜８０μｍの樹脂皮膜の存在が必要である。この樹脂
皮膜は、複合押出し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。また、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 elongation at break is 50 on both sides of the surface-treated steel sheet.
300%, a tensile modulus of 60 kg / mm 2 or more, thickness 1
The presence of a resin film of 0 to 80 μm is required. This resin film, when processing the cutting guide groove by composite extrusion molding,
By following the substrate with good adhesion and having excellent workability of the film itself, it completely covers the substrate even after processing, and is an important entity that eliminates the need for repair painting that has been required conventionally. When the can is opened, a specific resin is used to prevent only the resin from remaining locally on the cut end surface of the cutting guide groove (a film remaining phenomenon, hereinafter referred to as a feather) and impairing the appearance impression. There is a need.
【００１２】本発明に必要とされる樹脂皮膜物性とし
て、破断伸びが５０〜３００％の範囲内にあることが重
要である。破断伸びが５０％未満では、後述する複合押
出し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。一
方、樹脂皮膜の破断伸びが３００％を超える場合、開缶
時に問題を生じる。即ち、開缶時には積層された樹脂フ
ィルムを切断案内溝に沿って破断する必要があり、伸び
が高すぎる場合には、破断までの間に膜が長く伸び、膜
残り現象を生じ易いため３００％以下の伸び率に抑える
必要がある。加工性およびフェザー性の両者を満足でき
る伸び特性として、５０〜３００％の範囲、さらに望ま
しくは７０〜２００％の範囲にあることが必要である。It is important that the elongation at break is in the range of 50 to 300% as a physical property of the resin film required for the present invention. If the elongation at break is less than 50%, a large number of defects are generated in the resin film due to insufficient elongation, which is not preferable for the formation of a thin portion at the time of composite extrusion described later. On the other hand, when the elongation at break of the resin film exceeds 300%, a problem occurs when the can is opened. That is, when the can is opened, it is necessary to break the laminated resin film along the cutting guide groove. If the elongation is too high, the film elongates long before the breakage, and a film remaining phenomenon is easily generated. It is necessary to keep the elongation below. The elongation property satisfying both the workability and the feather property needs to be in the range of 50 to 300%, more preferably in the range of 70 to 200%.
【００１３】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。樹脂皮膜物性としての第２の重要な点は、引張
弾性率を６０ｋｇ／ｍｍ2 以上、さらに望ましくは９０
ｋｇ／ｍｍ2 以上の引張弾性率の樹脂皮膜を必要とする
ところである。引張弾性率とは引張比例限度内における
引張応力とこれに対応するひずみの比であり、引張試験
における応力−ひずみ曲線に直線部分がない場合には、
変形開始点における接線の傾斜より求められる。この弾
性率は、樹脂自体の硬さの程度を示すものであり、大き
な弾性率を有するもの程腰が強く、素地鋼板との強度差
を小さく保つことにより優れた加工性の付与が期待され
る。この引張弾性率を６０ｋｇ／ｍｍ2 以上、さらに望
ましくは９０ｋｇ／ｍｍ2 以上の樹脂皮膜を採用するこ
とにより、複合押出し加工時に、樹脂皮膜が金型Ｒ部に
て削られビルドアップしたり、金型との摩擦部分での疵
入り等を有効に防止することができ、加工時の皮膜欠陥
の発生を防止し、内外面の無補修化に道を開くものであ
る。The elongation characteristics of the laminated resin film are measured by peeling the resin film from the substrate and following a method according to JIS C2318. The second important point as the physical properties of the resin film is that the tensile elastic modulus is 60 kg / mm 2 or more, more preferably 90 kg / mm 2 or more.
This is where a resin film having a tensile modulus of not less than kg / mm 2 is required. The tensile modulus is the ratio of the tensile stress within the tensile proportional limit to the corresponding strain.If there is no linear part in the stress-strain curve in the tensile test,
It is obtained from the inclination of the tangent at the deformation start point. This elastic modulus indicates the degree of hardness of the resin itself, and the greater the elastic modulus, the stronger the stiffness, and it is expected that excellent workability is imparted by keeping the difference in strength from the base steel sheet small. . By adopting a resin film having a tensile modulus of 60 kg / mm 2 or more, more desirably 90 kg / mm 2 or more, the resin film is shaved at the mold R portion during compound extrusion processing, and build-up is performed. It can effectively prevent the formation of flaws and the like in the frictional portion with the mold, prevent the occurrence of film defects during processing, and open the way to no repair of the inner and outer surfaces.
【００１４】本発明の積層されるフィルム厚みは１０〜
８０μｍの範囲内のものであるが、性能の安定性・経済
性等を考慮した場合、１６〜６０μｍの範囲のものが特
に有効である。薄すぎる場合には加工欠陥を生じ易いこ
とは自明のことであるが、厚ければよい訳でもない。６
０μｍ超、特に８０μｍ以上の皮膜になった場合、加工
後の耐食性はよりよい方向に進むが、切断案内溝を破断
する場合（開缶時）、破断までの間に膜が長く伸び、膜
残り現象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。The thickness of the laminated film of the present invention is 10 to
Although it is within a range of 80 μm, a range of 16 to 60 μm is particularly effective in consideration of performance stability and economy. It is obvious that if the thickness is too thin, processing defects are likely to occur. 6
When the film thickness exceeds 0 μm, especially 80 μm or more, the corrosion resistance after processing proceeds in a better direction. However, when the cutting guide groove is broken (when the can is opened), the film elongates long before breaking, and the film remains. Adopting an excessively thick coating is disadvantageous because the phenomenon is likely to occur.
【００１５】具体的に使用される樹脂フィルムの例とし
ては、２軸延伸ポリエステル、２軸延伸ナイロン、無延
伸ポリプロピレン、２軸延伸ポリプロピレン、ポリエチ
レン等のフィルムが挙げられる。ラミネート方法として
は、フィルム自体を熱接着するか、熱硬化型接着剤を塗
布して前述せる鋼板両面に積層される。以上詳述した樹
脂皮膜を有する表面処理鋼板を用い、易開缶性蓋に成形
加工する際、その加工方法は極めて重要である。即ち、
代表的な従来技術である尖鋭刃の押圧方式による切断案
内溝の形成は、樹脂皮膜をも破断させ、成形後の補修塗
装を必要とするため好ましくない。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た
めには、伸び変形により材料全体を伸ばし、なだらかな
板厚変化で形成された薄肉部を形成することが重要であ
る。開口片の周縁部に、最薄部厚みが未加工部厚みの１
／２以下である薄肉部をその主構成要素とする切断案内
溝を形成することにより、開缶性に優れ、内外面の補修
塗装が不要な鋼板製易開缶蓋を得ることを可能となる。Specific examples of the resin film used include films of biaxially oriented polyester, biaxially oriented nylon, unoriented polypropylene, biaxially oriented polypropylene, polyethylene and the like. As a laminating method, the film itself is thermally bonded, or a thermosetting adhesive is applied, and the film is laminated on both surfaces of the steel plate as described above. When a surface-treated steel sheet having a resin film described in detail above is formed into an easily-openable lid, the processing method is extremely important. That is,
The formation of a cutting guide groove by a sharp blade pressing method, which is a typical prior art, is not preferable because it also breaks the resin film and requires repair painting after molding. In order to form a cutting guide groove that guarantees easy opening without breaking the resin film, it is important to stretch the entire material by elongation deformation and to form a thin portion formed with a gradual thickness change. is there. The peripheral edge portion of the opening piece, the thinnest part thickness of the unprocessed portion thickness 1
By forming a cutting guide groove whose main component is a thin-walled portion having a thickness of not more than / 2, it is possible to obtain an easy-open can lid made of a steel plate which has excellent can-opening property and does not require repair painting of inner and outer surfaces. .
【００１６】具体的な加工方法としては、開口片の形状
寸法とほぼ対応する上下型を使用して蓋本体の要所をプ
レス加工することにより、開口片形状に相当する部分を
上方あるいは下方に押出し成形を行う。この際、開口片
周縁部は、望みの厚みに到達するように上下型の間にて
伸ばされ、なだらかな板厚変化の薄肉部を形成すること
となる。最薄部板厚は、開缶性の面より加工前の板厚の
１／２以下とする必要がある。As a specific processing method, a portion corresponding to the shape of the opening piece is upwardly or downwardly pressed by pressing an important portion of the lid body using an upper and lower die substantially corresponding to the shape and dimensions of the opening piece. Extrusion molding is performed. At this time, the peripheral edge portion of the opening is extended between the upper and lower dies so as to reach a desired thickness, thereby forming a thin portion having a gradual change in plate thickness. The thickness of the thinnest part is required to be 以下 or less of the thickness before processing from the viewpoint of openability.
【００１７】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
た開口片部を加工前のレベルにまで押戻し加工を行う。
この際、前記の押出し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は、断面Ｖ字状に折曲げられ薄
肉の切断案内溝を構成することになる。この切断案内溝
の深さあるいは最薄部板厚等は、加工条件を適切に設定
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、素地鋼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。By this processing, the breaking position at the time of opening the can is determined. However, in order to improve the opening property and to make the shape of the opening after the opening of the can desirable, the opening piece portion extruded upward or downward. Is pushed back to the level before processing.
At this time, the thin portion having a gentle plate thickness change formed by the extrusion process is bent into a V-shaped cross section to form a thin cutting guide groove. The depth or the thickness of the thinnest portion of the cutting guide groove can be set to a desired value according to the workability of the material by appropriately setting the processing conditions. Processing conditions are selected according to the processability.
【００１８】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、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 properties is uniformly stretched together with the substrate, and no processing defects are generated. Therefore, there is no need for repair coating after processing, and good corrosion resistance is ensured. Can be. In addition, since the processing is based on press working such as extrusion or push-back, there is no problem of tool life seen in the sharp blade pressing method, and excellent productivity is guaranteed.
【００１９】本発明は開口片の周縁部に存在する切断案
内溝の最適化を主たる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 main feature of the present invention is to optimize a cutting guide groove present at a peripheral portion of an opening piece, and a tear-off system in which a handle and an opening piece are torn apart to be separated from a can body, a handle and an opening. It is possible to apply both types of the stay-on tub method in which both pieces remain fixed to the can body even after the can is opened.
【００２０】[0020]
【実施例】以下、本発明の実施例を示す。 実施例１ 板厚０．２６０ｍｍ、硬度６３（ＨR30T ）の薄鋼板の
表面に、付着量１．１ｇ／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８ｍｇ／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、変性ポリプロピレン−ポリエチレン共重合樹脂を接
着層として５０μｍの２軸延伸ポリプロピレン樹脂フィ
ルムを鋼板両面に積層した。使用された２軸延伸ポリプ
ロピレン樹脂フィルムは、伸び９０％、引張弾性率２６
０ｋｇ／ｍｍ2 のものであった。Embodiments of the present invention will be described below. Example 1 A thin steel plate having a thickness of 0.260 mm and a hardness of 63 (H R30T ) was subjected to electrotin plating with an adhesion amount of 1.1 g / m 2 on the surface. After tin is heated and melted to obtain a surface having a specular gloss, an electrolytic post-treatment is performed in a treatment bath mainly composed of chromic acid, and the metal chromium 8 mg / m 2 and the hydrated chromium oxide 12 mg / m 2 A chromate film having 2 (as Cr) was formed. After washing and drying, the steel sheet was heated, and a 50 μm biaxially stretched polypropylene resin film was laminated on both sides of the steel sheet using a modified polypropylene-polyethylene copolymer resin as an adhesive layer. The biaxially stretched polypropylene resin film used has an elongation of 90% and a tensile modulus of 26.
It was 0 kg / mm 2 .
【００２１】この両面に２軸延伸ポリプロピレン樹脂皮
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
応する上下型５、６をもって蓋本体の要所をプレス加工
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。この際、開口片２の周縁部と蓋本体１と連
片７は、下向拡開傾斜し、かつ伸び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
に凹入溝８を有する下型９上へ、上記開口片２が凹入溝
８の内側へ来るようにして、蓋本体１を載せ、下面が平
らな上型１０で押圧した。When a steel plate having a biaxially stretched polypropylene resin film on both sides is formed into an easy-open can lid as shown in FIG. 1, as shown in FIG. , 6 were pressed into key portions of the lid body, thereby extruding a portion corresponding to the opening piece 2 upward. At this time, the peripheral edge of the opening piece 2, the lid main body 1, and the connecting piece 7 were processed so as to form a thin portion which was inclined downward and widened and had a gradual change in plate thickness due to elongation. Next, as shown in FIG. 3, the lid main body is placed on a lower mold 9 having a recessed groove 8 at a portion corresponding to the peripheral edge of the opening piece 2 so that the opening piece 2 comes inside the recessed groove 8. 1 was placed and pressed by an upper mold 10 having a flat lower surface.
【００２２】この操作により、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、凹入溝８内へ突入する。かくして、蓋本体１の上面
における開口片２の周縁には、断面Ｖ字状をなす薄肉の
切断案内溝４が形成される。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。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２．０ｋ
ｇ以下と優れ、樹脂皮膜の通電量は０．３ｍＡ程度で健
全性に優れたものであり、目標を満足するものであっ
た。また、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。By this operation, the continuous piece 7 having a gradual change in plate thickness is bent downward substantially in a V-shape from the middle portion, and protrudes into the concave groove 8. Thus, a thin cutting guide groove 4 having a V-shaped cross section is formed at the periphery of the opening piece 2 on the upper surface of the lid main body 1. The easy-open can lid thus formed was subjected to an evaluation of can-opening property by measuring a tearing force of the opening piece 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 openability of the molded product (the force to raise the handle and the force to tear off the opening piece) is 2.0k
g or less, and the amount of current supplied to the resin film was about 0.3 mA, which was excellent in soundness and satisfied the target. In addition, no feather was noticeable visually around the cut end of the cut guide groove.
【００２３】実施例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フィルムを用い、低融点樹
脂を鋼板方面に熱接着することにより、両面にポリエス
テル樹脂皮膜を積層した。この際、使用されたフィルム
の全厚みは２５μｍであり、上層の延伸配向性を有する
ポリエステル樹脂層は、伸び１１０％、引張弾性率４０
０ｋｇ／ｍｍ2 のものであった。Example 2 Using a two-layer polyester resin film having a different melting point on the same plated steel sheet as in Example 1, a low-melting-point resin was thermally bonded to the steel sheet side to form a polyester resin film on both sides. Laminated. At this time, the total thickness of the film used was 25 μm, and the upper polyester resin layer having stretch orientation had an elongation of 110% and a tensile modulus of 40%.
It was 0 kg / mm 2 .
【００２４】この両面にポリエステル樹脂皮膜を有する
鋼板を用い、図１に示すような易開缶蓋を作成するに当
たり、図４（ａ）に示すように、開口片の形状寸法と対
応する上下型５、６をもって、開口片２に相当する部分
を下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、上向拡開傾斜し、かつ伸びにより
なだらかな板厚変化を有する薄肉部を形成するようにし
た。同時に、その下面周縁部に食い込み溝１６を付設
し、次いで、該開口片を上方へ押圧することにより、な
だらかな板厚変化を有する薄肉部を上方に向かってＶ字
状（図４（ｂ））に屈曲させて切断案内溝を形成した。
この食い込み溝１６の存在は切断案内溝４と食い込み溝
１６との間で著しく薄肉の部分を形成することにより開
缶性の向上を図るものであり、最薄肉部の鋼板厚みは６
０μｍになるように調整した。ポリエステル樹脂皮膜も
鋼板同様に成形され、最薄肉部表面に残留した膜厚は約
６μｍであった。When a steel plate having a polyester resin film on both sides is used to form an easy-open can lid as shown in FIG. 1, the upper and lower molds corresponding to the shape and size of the opening piece are formed as shown in FIG. With portions 5 and 6, a portion corresponding to the opening piece 2 was extruded downward. At this time, the peripheral portion of the opening piece 2, the lid main body 1 and the connecting piece 7 are formed so as to form a thin portion which is inclined upward and wide and has a gradual change in plate thickness due to elongation. At the same time, a biting groove 16 is provided in the peripheral edge of the lower surface, and then the opening piece is pressed upward, so that the thin portion having a gradual change in plate thickness is V-shaped upward (FIG. 4B). ) To form a cutting guide groove.
The presence of the biting groove 16 is intended to improve the openability by forming a remarkably thin portion between the cutting guide groove 4 and the biting groove 16, and the steel plate thickness of the thinnest portion is 6
It was adjusted to be 0 μm. The polyester resin film was formed in the same manner as the steel plate, and the film thickness remaining on the surface of the thinnest portion was about 6 μm.
【００２５】成形された製品の開缶性は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０．８
ｍＡ、外面側０．９ｍＡで実用的に十分満足できるもの
であった。また、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。 実施例３ 板厚０．１８０ｍｍ、硬度（ＨR30T）６４、伸び２４％
を有する鋼板の両面に付着量０．５８ｇ／ｍ2 のニッケ
ルめっきを行い、金属クロム５ｍｇ／ｍ2 ・水和酸化ク
ロム１２ｍｇ／ｍ2 （Ｃｒとして）よりなるクロメート
処理を行った。水洗・乾燥後、この鋼板を加熱し、熱硬
化性エポキシ系接着剤を介して４０μｍの２軸延伸ナイ
ロンフィルムを積層した。このナイロンフィルムは、伸
び９０％、引張弾性率１３０ｋｇ／ｍｍ2 のものであっ
た。The openability of the molded product is 1.8 kg or less and the can is opened without any problem.
mA and 0.9 mA on the outer surface side were satisfactory enough for practical use. In addition, no feather was noticeable visually around the cut end of the cut guide groove. Example 3 Sheet thickness 0.180 mm, hardness ( HR30T ) 64, elongation 24%
Was plated on both sides of a steel sheet having a thickness of 0.58 g / m 2 and subjected to a chromate treatment comprising 5 mg / m 2 of metallic chromium and 12 mg / m 2 of hydrated chromium oxide (as Cr). After washing and drying, the steel sheet was heated, and a 40 μm biaxially stretched nylon film was laminated via a thermosetting epoxy adhesive. This nylon film had an elongation of 90% and a tensile modulus of 130 kg / mm 2 .
【００２６】この両面に２軸延伸ナイロン樹脂皮膜を有
する鋼板を実施例２と同様の加工方法で最薄肉部の鋼板
厚みが５０μｍになるように加工した。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１１
μｍであった。成形された製品の開缶性は１．６ｋｇ以
下で問題なく開缶され、樹脂皮膜の通電値は内面側０．
１ｍＡ、外面側０．０８ｍＡで実用的に十分満足できる
ものであった。また、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。A steel sheet having a biaxially stretched nylon resin film on both surfaces was worked in the same manner as in Example 2 so that the thickness of the thinnest steel sheet became 50 μm. The resin film is formed in the same manner as a steel plate, and the film thickness remaining on the thinnest part surface is about 11
μm. The openability of the molded product is 1.6 kg or less and the can is opened without any problem.
1 mA and 0.08 mA on the outer surface side were satisfactory enough for practical use. In addition, no feather was noticeable visually around the cut end of the cut guide groove.
【００２７】比較例１ 実施例１と同一のめっき鋼板上に、変性ポリプロピレン
−ポリエチレン共重合樹脂を接着層として５０μｍの無
延伸ポリプロピレン樹脂フィルムを鋼板両面に積層し
た。使用された無延伸ポリプロピレン樹脂フィルムは、
伸び４７０％、引張弾性率５０ｋｇ／ｍｍ2 のものであ
った。Comparative Example 1 A 50 μm non-stretched polypropylene resin film was laminated on both sides of the same steel plate as in Example 1 using a modified polypropylene-polyethylene copolymer resin as an adhesive layer. The unstretched polypropylene resin film used was
It had an elongation of 470% and a tensile modulus of 50 kg / mm 2 .
【００２８】この鋼板を素材とし、実施例１と同様の方
法で断面Ｖ字状をなす薄肉の切断案内溝を有する易開缶
蓋を作成した。開口片の形状寸法と対応する上下型をも
って蓋本体の要所をプレス加工した際、金型コーナーＲ
部に樹脂皮膜が削り取られ、樹脂がビルドアップする現
象が認められた。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。Using this steel sheet as a raw material, an easy-open can lid having a thin cutting guide groove having a V-shaped cross section was prepared in the same manner as in Example 1. When pressing important parts of the lid body with the upper and lower dies corresponding to the shape and dimensions of the opening piece, the die corner R
A phenomenon in which the resin film was scraped off at the portion and the resin was built up was observed. The openability of the molded product (the force to raise the handle and the force to tear off the opening piece) is excellent at 2.0 kg or less, and the electric current of the resin film is about 1.5 mA, which is judged to be practical in terms of corrosion resistance. However, the film remained sharply around the cut guide groove which was broken at the time of opening, giving an uncomfortable appearance, and there was a problem in practicality.
【００２９】比較例２ 実施例１と同一のめっき鋼板上に、膜厚４０μｍのポリ
スチレンフィルムを熱硬化性エポキシ系接着剤を介して
積層した。このフィルムは、破断伸び４０％、引張弾性
率１２０ｋｇ／ｍｍ2 のものであった。この鋼板を、実
施例２と同様の方法で加工したところ、樹脂皮膜の通電
値は５４０ｍＡと非常に大きな値を示し、切断案内溝内
部の樹脂皮膜に多くの欠陥発生が認められ、実用性のな
いものであった。Comparative Example 2 A polystyrene film having a thickness of 40 μm was laminated on the same plated steel plate as in Example 1 via a thermosetting epoxy adhesive. This film had a breaking elongation of 40% and a tensile modulus of 120 kg / mm 2 . When this steel sheet was processed in the same manner as in Example 2, the current value of the resin film showed a very large value of 540 mA, and many defects were found in the resin film inside the cutting guide groove, and the practicality was improved. There was nothing.
【００３０】[0030]
【発明の効果】以上述べたごとく、本発明による易開缶
蓋の製造方法は、素材と加工方法を特定すること、即ち
本発明加工法に合致した特性を有する樹脂皮膜と、尖鋭
刃を使用しない複合押出し加工法の採用により構築され
るものである。従って、従来技術の大きな問題であった
加工用工具寿命の問題、補修塗装を必要とする問題、耐
食性面での不安等を全く皆無にすることができる。As described above, the manufacturing method of the easy-open can lid according to the present invention specifies a material and a processing method, that is, uses a resin film having characteristics conforming to the processing method of the present invention and a sharp blade. It is constructed by adopting a complex extrusion processing method. Therefore, it is possible to completely eliminate the problems of the service life of the working tool, the problem that requires repair painting, and the uneasiness of the corrosion resistance, which are the major problems of the prior art.
【００３１】鋼板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。If a steel plate easy-open can lid is put to practical use, it will be possible to make it into a “monometal can”, and it will be possible to provide the market with products suitable for recycling in response to recent global environmental problems. It is. Naturally, the steel sheet itself is excellent in economic efficiency, and it is expected that by using steel plates for both the can body and the can lid, the product will be more economical and easy to reuse as resources.
【図１】本発明により形成された引きちぎり式開口片を
有する缶蓋の斜視図である。FIG. 1 is a perspective view of a can lid having a tear-opening piece 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であ
る。FIG. 2 is a longitudinal 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であ
る。FIG. 3 is a longitudinal sectional view showing the procedure of the present invention in the order of steps.
【図４】（ａ）は下面周縁部に食い込み溝を有する皿状
の開口片を蓋全体に形成する状態を示す縦断面図、
（ｂ）は（ａ）の状態から切断案内溝を形成した状態を
示す縦断面図である。FIG. 4 (a) is a longitudinal sectional view showing a state in which a dish-shaped opening piece having a biting groove on the lower peripheral edge is formed on the entire lid;
(B) is a longitudinal sectional view showing a state where a cutting guide groove is formed from the state of (a).
【図５】従来の尖鋭刃の押圧方式による断面Ｖ字型の切
断案内溝を示す断面図である。FIG. 5 is a sectional view showing a cutting guide groove having a V-shaped cross section by a conventional sharp blade pressing method.
１ 蓋本体 ２ 開口片 ４ 切断案内溝 ５ 上型 ６ 下型 ７ 連片 ８ 凹入溝 ９ 下型 １０ 上型 １６ 食い込み溝 DESCRIPTION OF SYMBOLS 1 Lid body 2 Opening piece 4 Cutting guide groove 5 Upper die 6 Lower die 7 Connecting piece 8 Recessed groove 9 Lower die 10 Upper die 16 Biting groove
───────────────────────────────────────────────────── フロントページの続き (72)発明者 谷内 啓二 東京都大田区西糀谷２丁目６番７号 有 限会社谷啓製作所内 (56)参考文献 特開 昭64−83328（ＪＰ，Ａ) 特開 昭56−117843（ＪＰ，Ａ) 特開 昭64−15235（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) B65D 1/12 B21D 51/44 ──────────────────────────────────────────────────続 き The continuation of the front page (72) Inventor Keiji Taniuchi 2-6-7 Nishikojiya, Ota-ku, Tokyo Limited company Tani Kei Seisakusho (56) References JP-A-64-83328 (JP, A) 56-117843 (JP, A) JP-A 64-15235 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) B65D 1/12 B21D 51/44
Claims (3)
０ｋｇ／ｍｍ2 以上、厚み１０〜８０μｍの樹脂皮膜を
両面に有する樹脂積層鋼板を用い、開口片の周縁部に、
最薄部厚みが未加工部厚みの１／２以下である薄肉部を
その主構成要素とする切断案内溝を、複合押出し加工に
て形成することを特徴とする樹脂積層鋼板による内外面
無補修化易開缶蓋の製造方法。An elongation at break of 50 to 300% and a tensile modulus of elasticity of 6
0 kg / mm 2 or more, using a resin laminated steel sheet having a resin film with a thickness of 10 to 80 μm on both sides, on the periphery of the opening piece,
A cutting guide groove having a thin portion having a thickness of 1/2 or less of a thickness of an unprocessed portion or less as a main component is formed by a composite extrusion process. A method for manufacturing an easily-openable can lid.
片に相当する部分を、最薄部となる連片７の板厚が加工
前板厚の１／２以下の厚さとなるよう上方あるいは下方
に予備押出し加工した後、上方あるいは下方に押出され
た加工部を加工前のレベルに押戻し加工する複合押出し
加工であることを特徴とする請求項１記載の樹脂積層鋼
板による内外面無補修化易開缶蓋の製造方法。 2. The method according to claim 1, wherein the composite extrusion is performed by opening the lid body.
The part corresponding to the piece is processed by the thickness of the connecting piece 7 which is the thinnest part.
Upper or lower so that the thickness is less than 1/2 of the front plate thickness
Pre-extrusion, then extruded upward or downward
Extrusion that pushes back the processed part to the level before processing
The resin-laminated steel according to claim 1, wherein the steel is processed.
A method for manufacturing an easy-open can lid with no inner and outer surfaces that requires repair.
溝１６を設けることを特徴とする請求項２記載の樹脂積
層鋼板による内外面無補修化易開缶蓋の製造方法。 3. In the pre-extrusion process, a bite
The resin product according to claim 2, wherein a groove (16) is provided.
Manufacturing method of easy-open can lid with no repair on inner and outer surfaces using multi-layer steel plate.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3293420A JP3018049B2 (en) | 1991-11-08 | 1991-11-08 | Method for manufacturing easy-open can lid with no repair on inner and outer surfaces using resin laminated steel sheet |
| EP19920118830 EP0542104B1 (en) | 1991-11-08 | 1992-11-03 | Coated steel can lid with opening arrangement not requiring repair coating on outer and inner surfaces |
| DE1992628977 DE69228977T2 (en) | 1991-11-08 | 1992-11-03 | Can lid made of coated steel with an opening device, whereby inner and outer coatings do not have to be repaired |
| US07/971,797 US5348809A (en) | 1991-11-08 | 1992-11-05 | Sheet steel easy open can lid superior in can openability and not requiring repair coating of inner and outer surfaces |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3293420A JP3018049B2 (en) | 1991-11-08 | 1991-11-08 | Method for manufacturing easy-open can lid with no repair on inner and outer surfaces using resin laminated steel sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06122438A JPH06122438A (en) | 1994-05-06 |
| JP3018049B2 true JP3018049B2 (en) | 2000-03-13 |
Family
ID=17794538
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3293420A Expired - Fee Related JP3018049B2 (en) | 1991-11-08 | 1991-11-08 | Method for manufacturing easy-open can lid with no repair on inner and outer surfaces using resin laminated steel sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3018049B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1029695A (en) * | 1996-07-15 | 1998-02-03 | Tajima Kogyo Kk | Device for removing end sheet of can |
-
1991
- 1991-11-08 JP JP3293420A patent/JP3018049B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06122438A (en) | 1994-05-06 |
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