JP2791842B2 - Easy-to-open lid made of steel plate with no repair on the inside and outside with excellent openability - Google Patents
Easy-to-open lid made of steel plate with no repair on the inside and outside with excellent openabilityInfo
- Publication number
- JP2791842B2 JP2791842B2 JP3293418A JP29341891A JP2791842B2 JP 2791842 B2 JP2791842 B2 JP 2791842B2 JP 3293418 A JP3293418 A JP 3293418A JP 29341891 A JP29341891 A JP 29341891A JP 2791842 B2 JP2791842 B2 JP 2791842B2
- Authority
- JP
- Japan
- Prior art keywords
- lid
- thickness
- easy
- steel sheet
- steel plate
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K16/00—Machines with more than one rotor or stator
Description
【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【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 a steel plate easy-to-open lid which can be easily opened manually or partially on the entire surface of a can lid. Used for a wide range of applications.
【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 almost the entire surface of a container lid by hand, is 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って、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という基本的特
徴を有しており、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 steel material itself has a fundamental feature of high strength, and in order to form a cutting guide groove that can be easily opened by hand, a sharpness reaching about half to 2/3 of the sheet thickness before processing. Intense pressing of the blade is required. If the depth of this cutting guide groove is too shallow, poor openability,
If it is too deep, it will cause insufficient impact strength against external shocks, so that considerable accuracy is required.
【０００５】従って、加工用工具にも相当の精度が要求
されるが、尖鋭刃の激しい押圧が必要な鋼板の場合、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 of the processing tool, the coating on the steel plate surface being destroyed by the processing, the entire circumference of the cutting guide groove or the handle caulking part, 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） 硬度（ＨR30T）：５４〜６８、伸び：１０〜４
０％を有する表面処理鋼板の両面に、ガラス転移温度５
０℃以上、結晶融解温度２１０℃以上、配向度０．０３
０〜０．１６０のポリエステル樹脂を積層した鋼板を用
い、開口片の周縁部に、最薄部厚みが加工前厚みの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
が、複合押出し加工にて形成されていることを特徴とす
る開缶性に優れた内外面無補修型鋼板製易開缶蓋。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) Hardness ( HR30T ): 54-68, elongation: 10-4
A glass transition temperature of 5 on both sides of a surface-treated steel sheet having 0%
0 ° C or higher, crystal melting temperature 210 ° C or higher, orientation degree 0.03
Using a steel sheet laminated with a polyester resin of 0 to 0.160, the thickness of the thinnest portion at the peripheral portion of the opening piece is 1 / th of the thickness before processing.
An easily openable can-opening lid made of a non-repairable steel plate with excellent openability, characterized in that a cutting guide groove whose main component is a thin-walled portion of 2 or less is formed by composite extrusion.
【０００９】（２） 積層される樹脂皮膜の下に、５０
℃以下のガラス転移温度を有するポリエステル樹脂層を
有することを特徴とする前項１記載の開缶性に優れた内
外面無補修型鋼板製易開缶蓋。 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、硬度（ＨR30T）：５４〜６８、伸び：１０〜４０
％を有することを必要とする。本発明において、開缶性
を左右する切断案内溝は後述する複合押出し加工により
形成されるが、基本的には素材の伸びを利用して薄肉部
を作り、その最薄部を引きちぎることにより開缶される
ものである。従って、より開け易い蓋を得るためには、
最薄部厚みをより薄くすることが重要である。このた
め、素材は優れた伸び特性を有するものである必要があ
る。(2) Under the resin film to be laminated, 50
2. The easy-open can-open lid made of a non-repairable steel plate having an inner and outer surface excellent in can openability according to the above item 1, wherein the lid has a polyester resin layer having a glass transition temperature of not more than ° C. Hereinafter, the present invention will be described in detail. The steel sheet used in the present invention has a hardness ( HR30T ) of 54 to 68 and an elongation of 10 to 40.
You need to have%. In the present invention, the cutting guide groove which affects the openability is formed by a composite extrusion process described later. Basically, a thin portion is formed by utilizing the elongation of the material, and the thin portion is opened by tearing the thinnest portion. What can be. Therefore, to obtain a lid that is easier to open,
It is important to make the thinnest part thinner. Therefore, the material needs to have excellent elongation characteristics.
【００１０】一方、蓋そのものは缶体の一部を構成する
ものであり、缶強度を保持するためには強度の強い素材
が必要である。特に、ビール缶あるいは炭酸飲料缶のよ
うな内圧缶の場合には、内圧に耐える十分な強度が必要
とされる。一般的に、材料強度を上げようとすると伸び
特性が落ちてくることはよく知られており、缶強度・開
缶性（最薄部厚みの低減）・経済性（板厚）の最も優れ
たバランスの得られる範囲は、硬度（ＨR30T）：５４〜
６８、伸び：１０〜４０％にある。このうち、硬度が高
く、伸びも大きいものが、最も優れた経済性を与えてく
れる。On the other hand, the lid itself constitutes a part of the can body, and a material having high strength is required to maintain the strength of the can. In particular, in the case of an internal pressure can such as a beer can or a carbonated beverage can, a sufficient strength to withstand the internal pressure is required. In general, it is well known that elongation characteristics decrease when trying to increase the material strength, and the most excellent can strength, openability (reduction in thickness at the thinnest part), and economic efficiency (sheet thickness). The range in which the balance can be obtained is hardness ( HR30T ): 54 to
68, elongation: 10-40%. Among them, the one with high hardness and large elongation gives the best economic efficiency.
【００１１】このような機械的性質を有する鋼板を素地
として、その上に表面処理を行うわけであるが、めっき
の種類は特定するものではない。Ｓｎ、Ｃｒ、Ｎｉ、Ａ
ｌ、Ｚｎの１種または２種以上の金属をめっきした表面
処理鋼板で、板厚は０．１５〜０．３０ｍｍのものが多
用される。めっき鋼板の最表面には、ポリエステル樹脂
皮膜の密着性確保のため、クロム酸処理皮膜を存在させ
る方が望ましい。クロム水和酸化物皮膜単独あるいは金
属クロムを下地に有する皮膜が有効であり、クロム水和
酸化物皮膜が表面全体を均一に被覆していることが重要
である。A steel sheet having such mechanical properties is used as a base material and surface treatment is performed thereon, but the type of plating is not specified. Sn, Cr, Ni, A
A surface-treated steel sheet plated with one or more metals of l and Zn and having a thickness of 0.15 to 0.30 mm is often used. It is desirable that a chromic acid-treated film be present on the outermost surface of the plated steel sheet in order to ensure adhesion of the polyester resin film. A chromium hydrated oxide film alone or a film having metallic chromium as a base is effective, and it is important that the chromium hydrated oxide film uniformly covers the entire surface.
【００１２】この表面処理鋼板の両面に、ガラス転移温
度５０℃以上、結晶融解温度２１０℃以上、配向度０．
０３０〜０．１６０のポリエステル樹脂の存在が必要と
される。このポリエステル樹脂皮膜は、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。A glass transition temperature of 50 ° C. or more, a crystal melting temperature of 210 ° C. or more, and a degree of orientation of 0.
The presence of a polyester resin from 030 to 0.160 is required. This polyester resin film completely adheres to the substrate even after processing, because the polyester resin film follows the substrate with good adhesion when processing the cutting guide groove by composite extrusion and the film itself has excellent workability. It is an important entity that makes repair painting unnecessary.
【００１３】本発明でのポリエステル樹脂とは、ジカル
ボン酸とジオールの縮重合で得られる線状熱可塑性ポリ
エステルであり、ポリエチレンテレフタレートで代表さ
れるものである。ジカルボン酸成分としては、テレフタ
ル酸、イソフタル酸、フタル酸、アジピン酸、セバチン
酸、アゼライン酸、２、６−ナフタレンジカルボン酸、
デカンジカルボン酸、ドデカンジカルボン酸、シクロヘ
キサンジカルボン酸などの単独または混合物であり、ジ
オール成分としては、エチレングリコール、ブタンジオ
ール、デカンジオール、ヘキサンジオール、シクロヘキ
サンジオール、ネオペンチルグリコールなどの単独ある
いは混合物である。２種以上のジカルボン酸成分やジオ
ール成分による共重合体や、ジエチレングリコール、ト
リエチレングリコールなどの他のモノマーやポリマーと
の共重合体であってもよい。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 polyester resin in the present invention is a linear thermoplastic polyester obtained by polycondensation of a dicarboxylic acid and a diol, and is represented by polyethylene terephthalate. As the dicarboxylic acid component, terephthalic acid, isophthalic acid, phthalic acid, adipic acid, sebacic acid, azelaic acid, 2,6-naphthalenedicarboxylic acid,
It is a single or mixture of decanedicarboxylic acid, dodecanedicarboxylic acid, cyclohexanedicarboxylic acid and the like, and the diol component is a single or mixture of ethylene glycol, butanediol, decanediol, hexanediol, cyclohexanediol, neopentyl glycol and the like. It may be a copolymer of two or more dicarboxylic acid components or diol components, or a copolymer with another monomer or polymer such as diethylene glycol or triethylene glycol. If necessary, additives such as plasticizers, antioxidants, heat stabilizers, inorganic particles, pigments, and organic lubricants are blended.
【００１４】こうして得られるポリエステル樹脂は、Ｔ
−ダイにより溶融状態にてフィルム状に成形し、非晶状
態より２軸延伸することにより、耐熱性・加工性・バリ
アー性等の性能バランスの優れたフィルムに成形され
る。本発明に必要とされる樹脂皮膜物性として、ガラス
転移温度が５０℃以上であることがまず重要である。周
知のごとく、ガラス転移温度は、樹脂がガラス状態より
ゴム弾性状態に変化する温度であり、ガラス転移温度の
低い方が室温での加工性は優れているわけであるが、柔
らかく疵が入り易いか、あるいは金型等にビルドアップ
する等の欠点を有し、工業的な大量生産を行う場合に問
題を生じる。従って、樹脂皮膜は５０℃以上、さらに望
ましくは６０℃以上のガラス転移温度を有することが重
要である。The polyester resin thus obtained has a T
-It is formed into a film in a molten state by a die, and is biaxially stretched from an amorphous state to form a film having an excellent balance of heat resistance, workability, barrier properties, and the like. As a physical property of the resin film required for the present invention, it is first important that the glass transition temperature is 50 ° C. or higher. As is well known, the glass transition temperature is a temperature at which a resin changes from a glassy state to a rubber elastic state, and a lower glass transition temperature means that the workability at room temperature is better, but it is soft and easily scratched. Or, it has drawbacks such as build-up in a mold or the like, and causes a problem when performing industrial mass production. Therefore, it is important that the resin film has a glass transition temperature of 50 ° C. or more, more preferably 60 ° C. or more.
【００１５】非常に高度の性能を期待する場合には、鋼
板面側に、密着性・加工性の優れた５０℃以下のガラス
転移温度を有する層、表面側に、疵入りおよび型への凝
着のない５０℃以上のガラス転移温度を有する層、の２
層構造とすることが有効である。ガラス転移温度を５０
℃以上とする第２の理由は、開缶時の耐フェザリング性
の問題である。開口片を引きちぎり開缶した場合、５０
℃未満のガラス転移温度を有する樹脂では、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心配があ
るからである。When a very high level of performance is expected, a layer having a glass transition temperature of 50 ° C. or less, which is excellent in adhesion and workability, is provided on the steel sheet surface side, and a flaw is formed on the surface side and the mold is hardened. A layer having a glass transition temperature of 50 ° C. or higher without adhesion.
It is effective to form a layer structure. Glass transition temperature of 50
The second reason for setting the temperature to not less than ° C. is a problem of feathering resistance at the time of opening the can. When the opening piece is torn off and opened, 50
This is because, in a resin having a glass transition temperature of less than 0 ° C., broken pieces of the film are conspicuous at the cut portion, and there is a concern that the resin may give an uncomfortable appearance.
【００１６】次に、樹脂の結晶融解温度を特定した理由
は、結晶融解温度が２１０℃未満になるとポリエステル
樹脂の耐熱性が低下し、製缶工程で必要な加熱処理条件
に著しい制約を生じることになるからである。ここでの
結晶融解温度とは、示差走査熱量計にて、５℃／ｍｉｎ
の加熱速度で昇温した時に現れる吸熱ピークの最大ピー
クを示す温度をいう。Next, the reason why the crystal melting temperature of the resin is specified is that when the crystal melting temperature is lower than 210 ° C., the heat resistance of the polyester resin is reduced, and the heat treatment conditions required in the can-making process are significantly restricted. Because it becomes. Here, the crystal melting temperature is 5 ° C./min by a differential scanning calorimeter.
The maximum endothermic peak that appears when the temperature is increased at a heating rate of 1.
【００１７】さらに、もう一つの物性として、配向度が
０．０３０〜０．１６０の範囲、さら望ましくは０．０
５０〜０．１４０の範囲にあることが重要である。ここ
での配向度（Ｎ）は、次式より表示される。 Ｎ＝（Ｎx ＋Ｎy ）／２−Ｎz （Ｎx ：横方向の屈折率、Ｎy ：縦方向の屈折率、
Ｎz ：厚み方向の屈折率） 本来のポリエステルフィルムとしては、配向度は大きい
方が機械的性質・耐熱性・ガス透過性等の性質の優れた
ものが得られるが、本発明のような複合加工を行う用途
においては、加工性・開缶性・加工後耐熱性等の面より
最適範囲が存在するものである。配向度０．０３０未満
では、樹脂自体の耐熱性・ガス透過性等に劣るため問題
があり、配向度０．１６０超では、加工性・開缶性およ
び加工後耐熱性に問題が生じる。特に、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、配向度が高すぎる場合には膜残り現象を生じ易
いため、０．０５０〜０．１４０の範囲の配向度が望ま
しい。Further, as another physical property, the degree of orientation is in the range of 0.030 to 0.160, more preferably 0.030 to 0.160.
It is important to be in the range of 50 to 0.140. The degree of orientation (N) here is expressed by the following equation. N = ( Nx + Ny ) / 2- Nz ( Nx : refractive index in the horizontal direction, Ny : refractive index in the vertical direction,
(N z : refractive index in the thickness direction) As the original polyester film, the higher the degree of orientation, the better the properties such as mechanical properties, heat resistance and gas permeability can be obtained. In applications for processing, there is an optimum range in terms of workability, openability, heat resistance after processing, and the like. If the degree of orientation is less than 0.030, there is a problem because the resin itself is inferior in heat resistance and gas permeability, and if the degree of orientation is more than 0.160, problems arise in workability, openability, and heat resistance after processing. In particular, when the can is opened, it is necessary to break the laminated resin film along the cutting guide groove, and if the degree of orientation is too high, a film remaining phenomenon is likely to occur. Degree is desirable.
【００１８】積層されるフィルム厚みは５〜１００μｍ
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、１２〜４０μｍの範囲のものが多用され
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。以上詳述したポリエステル樹脂皮膜を有する
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、
ラミネート皮膜をも破断させ、成形後の補修塗装を必要
とするため好ましくない。The thickness of the film to be laminated is 5 to 100 μm
However, in consideration of the stability and economy of performance, the range of 12 to 40 μm is often used. 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 polyester resin film described in detail above is formed into an easily-openable lid, the processing method is extremely important. That is, the formation of the cutting guide groove by the pressing method of the sharp blade, which is a typical prior art,
It is not preferable because it also breaks the laminate film and requires repair painting after molding.
【００１９】ポリエステル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、局部的に大きな剪断
力を加えないで薄肉部を形成することが重要である。こ
のような加工方法で、開口片の周縁部に、最薄部厚みが
加工前厚みの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
とが可能となる。最終的には、開缶性は最薄部の板厚に
よって決定されるため、できるだけ薄く加工される。In order to form a cutting guide groove which ensures easy opening without breaking the polyester resin film,
It is important that the entire material is stretched by elongation deformation to form a thin portion without locally applying a large shearing force. With such a processing method, a cutting guide groove whose main component is a thin-walled portion whose thinnest portion thickness is not more than の of the thickness before processing is formed on the peripheral edge portion of the opening piece, so that the can opening property is improved. This makes it possible to obtain a steel plate easy-to-open lid that is excellent in terms of repair and does not require repair painting of the inner and outer surfaces. Ultimately, the openability is determined by the thickness of the thinnest part, so that it is processed as thin as possible.
【００２０】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、さら望ましくは１／３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 formed by pressing a portion corresponding to the shape of the opening piece upward or downward by pressing an important portion of the lid main body using an upper and lower mold substantially corresponding to the shape and size 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 portion is required to be 以下 or less, more preferably １ ／ or less, of the thickness before processing from the surface of can opening.
【００２１】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,
This forms 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.
【００２２】これらの一連の加工工程において、ポリエ
ステル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 polyester resin film 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 can be ensured. 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.
【００２３】本発明は開口片の周縁部に存在する切断案
内溝の最適化を主な特徴とするものであり、取っ手と開
口片を引きちぎり、缶本体と分離されるテアーオフ方式
と、取っ手および開口片共に開缶後も缶本体に固着され
たまま残るステイオンタブ方式の両方式に適用すること
が可能である。The present invention is mainly characterized by optimizing a cutting guide groove present at a peripheral portion of an opening piece, and a tear-off method in which a handle and an opening piece are torn off to be separated from a can body, and a handle and a handle are provided. It is possible to apply to both the stay-on tub system, in which both the opening pieces remain fixed to the can body even after the can is opened.
【００２４】[0024]
【実施例】以下、本発明の実施例を示す。 実施例１ 板厚０．２５０ｍｍ、硬度６２（ＨR30T ）、伸び２５
％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１０ｍｇ／ｍ2 およびその上に
水和酸化クロム１３ｍｇ／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、ガラス転移温度６８℃、結晶融解温度２３５
℃および０．１０５の面配向度を有する２０μｍの厚み
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。Embodiments of the present invention will be described below. Example 1 Plate thickness 0.250 mm, hardness 62 ( HR30T ), elongation 25
% Of the steel sheet was subjected to electrotin plating with an adhesion amount of 2.8 g / m 2 . After tin is heated and melted to obtain a mirror glossy surface, an electrolytic post-treatment is carried out in a treatment bath mainly composed of chromic acid, and metallic chromium 10 mg / m 2 and hydrated chromium oxide 13 mg / m 2 thereon A chromate film having 2 (as Cr) was formed. After washing and drying, the steel sheet was heated to a glass transition temperature of 68 ° C. and a crystal melting temperature of 235.
A 20 μm-thick polyester resin film having a degree of plane orientation of 0.15 ° C. and 0.105 was laminated on both sides of the steel sheet via a thermosetting polyester adhesive.
【００２５】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した。本実施例における最薄部厚み
は６２μｍであった。When a steel plate having a polyester resin film on both sides is formed into an easy-open can lid as shown in FIG. 1, as shown in FIG. 2, upper and lower dies 5, 6 corresponding to the shape and dimensions of the opening piece are used. By pressing key portions of the lid body, a portion corresponding to the opening piece 2 was extruded upward. At this time, the peripheral portion of the opening piece 2, the lid body 1 and the connecting piece 7
A thin portion inclined downward and having a gentle change in plate thickness due to elongation was formed. The thinnest part thickness in this example was 62 μm.
【００２６】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。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。Next, as shown in FIG. 3, the opening piece 2 is placed inside the recessed groove 8 on a lower mold 9 having a recessed groove 8 in a portion corresponding to the peripheral edge of the opening piece 2. , Lid body 1
And pressed by an upper mold 10 having a flat lower surface. By this operation, the continuous piece 7 having a gradual change in plate thickness is bent downward in a V-shape from a substantially 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.
【００２７】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。その結果、取っ手の引起し力および引きちぎ
り力共に１．８ｋｇ程度であり、優れた開缶性を示し
た。１％食塩水中での通電試験では、缶内面・缶外面と
も０．１ｍＡ以下であり、ポリエステル樹脂皮膜は全く
健全であり、目標を満足するものであった。The easy-open can lid thus formed was subjected to an evaluation of the openability by measuring the 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. . As a result, both the raising force and the tearing force of the handle were about 1.8 kg, indicating excellent openability. In a current test in 1% saline, the inner and outer surfaces of the can were 0.1 mA or less, and the polyester resin film was completely sound and satisfied the target.
【００２８】実施例２ 板厚０．１９０ｍｍ、硬度５６（ＨR30T ）、伸び３０
％を有する薄鋼板の表面に、実施例１と同様のめっきを
行い、水洗・乾燥後、異なった融点およびガラス転移温
度を有する２層構造ポリエステル樹脂フィルムを用い、
鋼板の両面に２５μｍ厚のポリエステル樹脂皮膜を積層
した。この際、接着層となる下層樹脂は５μｍの厚み
で、融点２１５℃、ガラス転移温度４０℃であり、上層
は厚み２０μｍで、融点２４０℃、ガラス転移温度６５
℃の共重合ポリエステル樹脂が使用された。配向度は
０．０８０程度のものとされた。Example 2 A plate thickness of 0.190 mm, a hardness of 56 (H R30T ) and an elongation of 30
% Of the surface of a thin steel sheet having the same percentage as in Example 1, washed with water and dried, and then using a two-layer polyester resin film having different melting points and glass transition temperatures,
A polyester resin film having a thickness of 25 μm was laminated on both surfaces of the steel sheet. At this time, the lower layer resin serving as the adhesive layer has a thickness of 5 μm, a melting point of 215 ° C. and a glass transition temperature of 40 ° C., and the upper layer has a thickness of 20 μm, a melting point of 240 ° C. and a glass transition temperature of 65 ° C.
° C copolyester resin was used. The degree of orientation was about 0.080.
【００２９】この鋼板を用い、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る。本実施例における最薄部の厚み
は５３μｍであった。Using this steel plate to form an easy-open can lid as shown in FIG. 1, as shown in FIG. 4 (a), the upper and lower dies 5, 6 corresponding to the shape and size of the opening piece are used to form the lid body. A portion corresponding to the opening piece 2 was extruded downward by pressing a key point. At this time, the peripheral portion of the opening piece 2, the lid main body 1 and the connecting piece 7 formed a thin-walled portion which was inclined upward and widened and had a gentle change in plate thickness due to elongation. At the same time, a biting groove 16 is provided at 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. 4).
(B) was bent to form a cutting guide groove. The presence of the biting groove 16 is intended to improve the can openability by forming a remarkably thin portion between the cutting guide groove 4 and the biting groove 16. The thickness of the thinnest part in this example was 53 μm.
【００３０】成形加工された蓋の性能は、開缶性は１．
６ｋｇと優れ、樹脂皮膜には通電は認められず、非常に
優れたものであり、目標を満足するものであった。 比較例１ 板厚０．２３０ｍｍ、硬度７０（ＨR30T ）、伸び８％
の薄鋼板の表面に、実施例１と同様のめっきを行い、さ
らに実施例１と同様の樹脂皮膜を積層後、最薄部が６０
μｍとなるように実施例１と同様の加工方法で加工し
た。材料の伸び不足のため、切断案内溝の一部が破断
し、正常な蓋を成形することができなかった。The performance of the molded lid is as follows.
It was 6 kg, which was excellent, and no electric current was observed in the resin film, which was very excellent and satisfied the target. Comparative Example 1 Plate thickness 0.230 mm, hardness 70 ( HR30T ), elongation 8%
After the same plating as in Example 1 was performed on the surface of the thin steel plate of Example 1 and a resin film similar to that of Example 1 was laminated, the thinnest part was 60
It was processed by the same processing method as in Example 1 so as to have a thickness of μm. A part of the cutting guide groove was broken due to insufficient elongation of the material, and a normal lid could not be formed.
【００３１】比較例２ 板厚０．２５０ｍｍ、硬度５０（ＨR30T ）、伸び４０
％の薄鋼板の表面に、実施例１と同様のめっきを行い、
さらに実施例１と同様の樹脂皮膜を積層後、最薄部が６
０μｍとなるように実施例１と同様の加工方法で加工し
た。加工は全く問題なく行うことが可能であったが、２
１１径（蓋：２０９径）缶に炭酸飲料を充填したとこ
ろ、蓋強度不足のため缶蓋がバックリング（局部的変
形）した。Comparative Example 2 A thickness of 0.250 mm, a hardness of 50 (H R30T ) and an elongation of 40
% Of the surface of a thin steel plate is plated in the same manner as in Example 1.
Furthermore, after laminating the same resin film as in Example 1, the thinnest part was 6
It was processed by the same processing method as in Example 1 so as to have a thickness of 0 μm. Processing could be performed without any problem, but 2
When the carbonated beverage was filled into an 11-diameter (lid: 209-diameter) can, the can lid buckled (local deformation) due to insufficient lid strength.
【００３２】比較例３ 実施例１と同様の鋼板に実施例１と同様のめっきを行
い、水洗・乾燥後、この鋼板を加熱し、ガラス転移温度
４０℃、結晶融解温度２２０℃および０．０８０の面配
向度を有する２０μｍの厚み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。Comparative Example 3 The same steel plate as in Example 1 was subjected to the same plating as in Example 1, washed with water and dried, and then heated to a glass transition temperature of 40 ° C., a crystal melting temperature of 220 ° C. and 0.080 ° C. A 20 μm-thick polyester resin film having the degree of plane orientation was laminated on both sides of the steel sheet via a thermosetting polyester adhesive.
【００３３】この鋼板を実施例１と同様の蓋成形を行っ
たところ、図２に示した下型および上型の凸状コーナー
Ｒ部に樹脂の凝着現象が見られ、金型の手入れを頻繁に
行う必要が生じた。When this steel sheet was subjected to lid forming in the same manner as in Example 1, a resin adhesion phenomenon was observed at the convex corners R of the lower die and the upper die shown in FIG. Needed to be done frequently.
【００３４】[0034]
【発明の効果】以上述べたごとく、本発明による易開缶
蓋は、素材と加工方法を特定すること、即ち優れた加工
性を有するポリエステル樹脂皮膜と、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 easy-open can lid according to the present invention specifies a material and a processing method, that is, a polyester resin film having excellent workability and a composite extrusion processing method which does not use a sharp blade. It is built by adoption. 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.
【００３５】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。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 into practical use, it can be made into a “monometal can”, and it will be possible to provide products suitable for recycling in response to recent global environmental problems to the market. 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
断案内溝の断面図である。FIG. 5 is a sectional view of a cutting guide groove having a V-shaped cross section formed 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 main body 2 Opening piece 4 Cutting guide groove 5 Upper die 6 Lower die 7 Connecting piece 8 Depression 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 (58)調査した分野(Int.Cl.6，ＤＢ名) B65D 17/28──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Keiji Yaniuchi 2-6-7 Nishikojiya, Ota-ku, Tokyo Inside the limited company Tanikei Seisakusho (58) Field surveyed (Int.Cl. 6 , DB name) B65D 17 / 28
Claims (2)
０〜４０％を有する表面処理鋼板の両面に、ガラス転移
温度５０℃以上、結晶融解温度２１０℃以上、配向度
０．０３０〜０．１６０のポリエステル樹脂を積層した
鋼板を用い、開口片の周縁部に、最薄部厚みが加工前厚
みの１／２以下である薄肉部をその主構成要素とする切
断案内溝が、複合押出し加工にて形成されていることを
特徴とする開缶性に優れた内外面無補修型鋼板製易開缶
蓋。1. Hardness ( HR30T ): 54-68, elongation: 1
Using a steel sheet in which a polyester resin having a glass transition temperature of 50 ° C. or more, a crystal melting temperature of 210 ° C. or more, and a degree of orientation of 0.030 to 0.160 is laminated on both surfaces of a surface-treated steel sheet having 0 to 40%, A cutting guide groove having a thin-walled portion whose main part is a thin-walled portion having a thickness of 1/2 or less of the thickness before processing as a main component is formed in a composite extrusion process. Excellent inner and outer surface repair-free steel plate easy-open can lid.
のガラス転移温度を有するポリエステル樹脂層を有する
ことを特徴とする請求項１記載の開缶性に優れた内外面
無補修型鋼板製易開缶蓋。2. The repairable inner and outer steel sheet according to claim 1, further comprising a polyester resin layer having a glass transition temperature of 50 ° C. or lower under the resin film to be laminated. Easy-to-open lid.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3293418A JP2791842B2 (en) | 1991-11-08 | 1991-11-08 | Easy-to-open lid made of steel plate with no repair on the inside and outside with excellent openability |
| 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 |
| 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 |
| 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 |
|---|---|---|---|
| JP3293418A JP2791842B2 (en) | 1991-11-08 | 1991-11-08 | Easy-to-open lid made of steel plate with no repair on the inside and outside with excellent openability |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06115548A JPH06115548A (en) | 1994-04-26 |
| JP2791842B2 true JP2791842B2 (en) | 1998-08-27 |
Family
ID=17794515
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3293418A Expired - Fee Related JP2791842B2 (en) | 1991-11-08 | 1991-11-08 | Easy-to-open lid made of steel plate with no repair on the inside and outside with excellent openability |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2791842B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020005408A1 (en) | 1997-08-12 | 2002-01-17 | Yuji Yamasaki | Easy-opening can end |
| JPH11105867A (en) | 1997-09-30 | 1999-04-20 | Nippon Steel Corp | Highly corrosion-resistant, easily openable resin-coated metal can lid requiring no repairs at obverse and reverse |
| US6435368B1 (en) | 1999-04-20 | 2002-08-20 | Nkk Corporation | Easy opening can end and method for fabricating the same |
| JP5669344B2 (en) * | 2008-07-07 | 2015-02-12 | Ｊｆｅスチール株式会社 | Easy-open can lid made of resin-coated steel sheet and method for producing the same |
| JP5765391B2 (en) * | 2013-09-17 | 2015-08-19 | Ｊｆｅスチール株式会社 | Easy-open can lid made of resin-coated steel sheet and method for producing the same |
-
1991
- 1991-11-08 JP JP3293418A patent/JP2791842B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06115548A (en) | 1994-04-26 |
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