JP2001171639A - Drinking can - Google Patents
Drinking canInfo
- Publication number
- JP2001171639A JP2001171639A JP35808399A JP35808399A JP2001171639A JP 2001171639 A JP2001171639 A JP 2001171639A JP 35808399 A JP35808399 A JP 35808399A JP 35808399 A JP35808399 A JP 35808399A JP 2001171639 A JP2001171639 A JP 2001171639A
- Authority
- JP
- Japan
- Prior art keywords
- lid
- pressure resistance
- pressure
- kpa
- beverage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Containers Having Bodies Formed In One Piece (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ビールやジュース
等の飲料缶に関する。The present invention relates to a beverage can such as beer or juice.
【０００２】[0002]
【従来の技術】従来、ビールやジュース等の飲料缶とし
ては、図３に示すように、缶底２を一体に有する円筒状
の缶胴１の開口端に、缶蓋３をシーミング加工して閉塞
状態としたアルミ合金製の２ピース缶が使用されてい
る。その缶蓋３も様々であるが、主流となっているもの
は、プルタブ等を付設することにより容易に缶を開封し
得るイージーオープン缶蓋すなわち容易開口缶蓋であ
る。その容易開口缶蓋には、大別してプルタブを引上げ
ることにより開口部分をなす開口片を除去するタイプの
ものと、開口片を容器内に押し込みタブが缶蓋から取れ
ないプッシュオープンタイプのものとがあり、最近では
プッシュオープンタイプのものが大勢を占めている。2. Description of the Related Art Conventionally, as a beverage can such as beer or juice, as shown in FIG. 3, a can lid 3 is seamed at an opening end of a cylindrical can body 1 integrally having a can bottom 2. A closed two-piece aluminum alloy can is used. The can lid 3 is also various, but the main one is an easy-open can lid, that is, an easy-open can lid that can be easily opened by attaching a pull tab or the like. The easy-opening can lid is roughly classified into two types: a type that removes an opening piece that forms an opening by pulling up a pull tab, and a push-open type that pushes the opening piece into the container and the tab cannot be removed from the can lid. In recent years, the push-open type has become the majority.
【０００３】例えばプッシュオープンタイプの簡易開口
缶蓋３は、図４に示すように、円形の天板４と、天板４
の周縁に設けられ、缶胴１（図３参照）に巻締められる
巻締め部５と、巻締め部５と天板４との間に周設された
外周溝６と、溝状のスコア７により天板４の中心ＣＰと
外周溝６との間に区画され、天板中心ＣＰ側で天板４に
連結された開口片８と、先端が開口片８の天板中心ＣＰ
側に重なるように配置され、リベット９により天板中心
ＣＰに連結されたプルタブ１０とからなり、プルタブ１
０を引くと、リベット９を支点としてプルタブ１０の先
端が開口片８を押圧し、その押圧力によりスコア７が破
断して、開口片８が押し下げられ、飲み口が形成される
ものである。For example, as shown in FIG. 4, a push-open type simple opening can lid 3 has a circular top plate 4 and a top plate 4.
, Which is provided on the periphery of the can body 1 (see FIG. 3), is wound around the can body 1 (see FIG. 3), an outer circumferential groove 6 is provided between the winder 5 and the top plate 4, and a groove-shaped score 7 is provided. The opening piece 8 is divided between the center CP of the top plate 4 and the outer peripheral groove 6 and connected to the top plate 4 on the side of the top plate center CP, and the top end of the top plate CP of the opening piece 8
And a pull-tab 10 connected to the center CP of the top plate by a rivet 9.
When 0 is subtracted, the tip of the pull tab 10 presses the opening piece 8 with the rivet 9 as a fulcrum, the score 7 is broken by the pressing force, the opening piece 8 is pushed down, and a drinking spout is formed.
【０００４】また、図１に示すように、缶底２には、缶
胴１の内部側へ球面状に凹んだドーム部１１と、このド
ーム部１１の周縁に連なり缶胴１の外部側へ缶軸方向に
突出した環状凸部（リム）１２とが形成されており、そ
れらにより缶底２の耐圧強度が高められている。この環
状凸部１２は、単なる缶底強度の向上のためばかりでな
く、缶胴１を直立させた際に接地する脚となり、缶胴１
の直立安定性及び支持強度を向上させる役目も果たす。[0004] As shown in FIG. 1, a dome portion 11 is formed on the can bottom 2 in a spherical shape inward of the can body 1, and is connected to a peripheral edge of the dome portion 11 and is directed to the outside of the can body 1. An annular convex portion (rim) 12 projecting in the axial direction of the can is formed, and thereby the pressure resistance of the can bottom 2 is increased. This annular convex portion 12 serves as a leg that is not only for simply improving the bottom strength of the can, but also serves as a leg that contacts the ground when the can body 1 is erected.
It also plays a role in improving the upright stability and support strength of the.
【０００５】[0005]
【発明が解決しようとする課題】ところで、ビール等の
アルコール飲料や糖分の高いジュース等を充填した飲料
缶の場合、冷凍保存すると、内容物が外周側から凍り始
めて最後に中心部が凍結するために、缶軸方向に凍結に
よる突き上げ力が働く。従来の飲料缶では、缶蓋３より
も缶底２の方が耐圧強度が高く設定されていたので、内
容物の凍結により缶の内部から突き上げ力が作用する
と、図５に示すように、缶蓋３が上方に押し上げられ
て、缶蓋３の外周溝６が部分的に外部に膨出して凸部１
５を形成する現象が起こる。この現象が起こると、単に
缶が開けにくくなる上に、ひどい場合にはスコア７が破
断して内容物が吹き出すという事態を招く。By the way, in the case of an alcoholic beverage such as beer or a beverage can filled with a juice having a high sugar content, if the content is frozen and stored, the content starts to freeze from the outer peripheral side and finally the central portion freezes. Then, a thrusting force due to freezing acts in the axial direction of the can. In the conventional beverage can, the can bottom 2 is set to have a higher pressure resistance than the can lid 3. Therefore, when a thrust force acts from the inside of the can due to the freezing of the contents, as shown in FIG. When the lid 3 is pushed upward, the outer peripheral groove 6 of the can lid 3 partially swells to the outside and the convex portion 1 is formed.
5 occurs. When this phenomenon occurs, it becomes difficult to open the can, and in severe cases, the score 7 is broken and the contents blow out.
【０００６】本発明は、上記事情に鑑み、ビール等のア
ルコール飲料や糖分の高いジュース等の内容物を充填し
た２ピース型の飲料缶において、冷凍保存した場合でも
缶蓋の変形が発生せず、内容物の吹き出しを防止するこ
とのできる飲料缶を提供することを目的としている。The present invention has been made in view of the above circumstances, and in a two-piece beverage can filled with contents such as alcoholic beverages such as beer and juice having a high sugar content, the can lid does not deform even when frozen and stored. It is another object of the present invention to provide a beverage can that can prevent the contents from blowing out.
【０００７】[0007]
【課題を解決するための手段】本発明は、缶底を一体に
有する円筒状の缶胴の開口端に、容易開口式の缶蓋を巻
き締めにより装着した飲料缶において、前記缶底の耐圧
強度を、缶蓋の耐圧強度よりも所定圧力以上低く設定し
たことを特徴とする（請求項１）。SUMMARY OF THE INVENTION The present invention relates to a beverage can in which an easy opening type can lid is attached to the open end of a cylindrical can body integrally having a can bottom by tightening. The strength is set to be lower than the pressure resistance of the can lid by a predetermined pressure or more (claim 1).
【０００８】このように缶底の耐圧強度を缶蓋の耐圧強
度よりも低くしたことにより、内容物が凍結したとき
に、缶底を先に変形させることができて、缶蓋のスコア
破断を防止することができる。その場合、缶底の耐圧強
度を、缶蓋の耐圧強度よりも６０ｋｐａ以上低く設定す
るのが、確実に缶蓋より先に缶底を変形させることがで
きるので好ましい。即ち、 （缶蓋強度）−（缶底強度）≧ ６０ｋｐａ とする。ただし、内容物充填設備における缶内圧の最高
到達圧よりも２０ｋｐａ以上高く設定するのが好ましい
（請求項２）。Since the pressure resistance of the can bottom is made lower than the pressure resistance of the can lid, when the contents freeze, the can bottom can be deformed first and the score of the can lid can be broken. Can be prevented. In this case, it is preferable to set the pressure resistance of the can bottom lower than the pressure resistance of the can lid by 60 kpa or more, because the can bottom can be surely deformed before the can lid. That is, (can lid strength) − (can bottom strength) ≧ 60 kpa. However, it is preferable that the pressure is set at least 20 kpa higher than the maximum ultimate pressure of the can in the content filling equipment (Claim 2).
【０００９】[0009]
【発明の実施の形態】以下、本発明の実施形態を図面に
基づいて説明する。図１に示すように、この実施形態の
飲料缶は、缶底２を一体に有する円筒状の缶胴１の開口
端に、缶蓋３をシーミング加工して閉塞状態としたアル
ミ合金製の２ピース缶であり、缶底２の耐圧強度を、缶
蓋３の耐圧強度よりも６０ｋｐａ以上低く設定すること
により、内容物が凍結した際に、缶蓋３よりも先に缶底
２が例えば図中二点鎖線で示すごとく変形し、凍結によ
る内容物の膨張分を缶底２の変形によってほぼ吸収でき
るようにしたものである。Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the beverage can of this embodiment is made of an aluminum alloy 2 in which a can lid 3 is seamed at an open end of a cylindrical can body 1 integrally having a can bottom 2 to form a closed state. By setting the pressure resistance of the can bottom 2 to be 60 kPa or more lower than the pressure resistance of the can lid 3, when the contents are frozen, the can bottom 2 is positioned earlier than the can lid 3 as shown in FIG. It is deformed as shown by the two-dot chain line, and the expansion of the content due to freezing can be substantially absorbed by the deformation of the can bottom 2.
【００１０】ただし、適正な耐圧性能を維持するため
に、缶底２の耐圧強度は、内容物充填設備における缶内
圧の最高到達圧よりも安全を見て２０ｋｐａ以上高く設
定してある。例えば、内容物充填設備における缶内圧の
最高到達圧が６００ｋｐａの場合は、缶底２の耐圧強度
を（６００＋２０）ｋｐａ以上に設定してある。即ち、
次の関係（ａ）、（ｂ）を満たすように、缶底２及び缶
蓋３の耐圧強度を設定している。 （ａ）６００ｋｐａ ＋２０ｋｐａ ≦ 缶底の耐圧強
度 （ｂ）缶底の耐圧強度＋６０ｋｐａ ≦ 缶蓋の耐圧強
度However, in order to maintain proper pressure resistance performance, the pressure resistance of the can bottom 2 is set to be 20 kpa or more higher than the maximum ultimate pressure of the internal pressure of the can in the content filling equipment in view of safety. For example, when the maximum internal pressure of the can in the content filling facility is 600 kpa, the pressure resistance of the can bottom 2 is set to (600 + 20) kpa or more. That is,
The pressure resistance of the can bottom 2 and the can lid 3 is set so as to satisfy the following relationships (a) and (b). (A) 600 kpa + 20 kpa ≦ pressure resistance of can bottom (b) pressure resistance of can bottom + 60 kpa ≦ pressure resistance of can lid
【００１１】なお、缶底２には、缶胴１の内部側へ凹む
ドーム部１１が形成され、ドーム部１１の周縁には、缶
胴１の外部側へ缶軸方向に突出した環状凸部（リム）１
２が形成されている。また、缶蓋３は、図４に示したも
のと同じように構成されている。従って、その上で素材
の厚さや形状等を変えることにより、缶蓋３と缶底２の
耐圧強度が、上記の（ａ）、（ｂ）の関係を満たすよう
に設定されている。A dome portion 11 is formed on the bottom 2 of the can body 1 so as to be recessed toward the inside of the can body 1. (Rim) 1
2 are formed. The can lid 3 has the same configuration as that shown in FIG. Therefore, by changing the thickness, shape, and the like of the raw material, the pressure resistance of the can lid 3 and the can bottom 2 is set so as to satisfy the above-described relationships (a) and (b).
【００１２】また、凍結に際して内容物（液体）が９％
膨張すると仮定した場合、空間容量は若干の余裕をみて
１０％必要である。正常な状態での空間容量（ヘッドス
ペース）は通常７％程度であるので、凍結時の変形によ
り拡大する容量が３％以上あれば、缶に亀裂が発生する
のを確実に防止できる。そこで、凍結時の変形によって
拡大する容量と初期空間容量（ヘッドスペース）とを合
わせた容量が、内容物の充填容量に対して１０％以上と
なるように、凍結時の変形の仕方を予測して、予定変形
量を設定している。つまり、凍結の際に缶底２がどのよ
うに変形するかはある程度予測できるので、その予測し
た変形が生じた際に、内容物の膨張を確実に吸収できる
ように缶底２の形状が設定されている。Further, the content (liquid) upon freezing is 9%
Assuming that the space expands, the space capacity is required to be 10% with a margin. Since the space capacity (head space) in a normal state is usually about 7%, if the capacity expanded by deformation during freezing is 3% or more, it is possible to reliably prevent the can from cracking. Therefore, the method of deformation during freezing is predicted so that the combined capacity of the capacity expanded by deformation during freezing and the initial space capacity (head space) is 10% or more of the filling capacity of the contents. And the expected deformation amount is set. In other words, how the bottom 2 deforms during freezing can be predicted to some extent, and the shape of the bottom 2 is set so that the expansion of the contents can be reliably absorbed when the predicted deformation occurs. Have been.
【００１３】次に、ビール（アルコール５％、内容量５
００ｍｌ）を充填した缶を、マイナス２０℃の冷凍室に
３日間保存した場合の実験結果について、図２を参照し
ながら述べる。Next, beer (alcohol 5%, content 5
(00 ml) is stored in a freezer at −20 ° C. for 3 days.
【００１４】実験の組み合わせはＮＯ．１〜ＮＯ．９の
９通りであり、それぞれ缶蓋と缶底の耐圧強度を違え
て、各々１００缶について実験した。ここで、耐圧強度
は、圧縮空気を缶内に充填したときに、缶蓋、缶底が変
形してしまうまでの圧力を測定したものであり、単位は
ｋｐａである。缶蓋の耐圧強度は５１０ｋｐａ、６５０
ｋｐａ、７２０ｋｐａの３通りを設定し、缶底の耐圧強
度は、缶蓋の耐圧強度との差が段階的に変わるように設
定した。それにより、缶蓋の耐圧強度から缶底の耐圧強
度を引いた値は、−２３０〜１２０の間で段階的に設定
されている。凍結適正の判定は、缶蓋が変形したものの
混入率が０％の場合を合格（○）とし、そうでない場合
を不合格（×）とした。The combination of experiments was NO. 1 to NO. The experiment was conducted on 100 cans, each having 9 different types of pressure strength of the can lid and the can bottom. Here, the pressure resistance is a value obtained by measuring the pressure until the can lid and the can bottom are deformed when the compressed air is filled in the can, and the unit is kpa. The pressure resistance of the can lid is 510 kpa, 650
kpa and 720 kpa were set, and the pressure resistance of the can bottom was set so that the difference from the pressure resistance of the can lid changed stepwise. Thereby, the value obtained by subtracting the pressure resistance of the can bottom from the pressure resistance of the can lid is set in a stepwise manner between -230 and 120. The determination of the appropriateness of freezing was made as acceptable (（) when the mixing ratio of the can lid was deformed and the mixing ratio was 0%, and as unacceptable (X) when not.
【００１５】実験の結果、図２に示すように、缶蓋から
缶底の耐圧強度を引いた値がマイナスからプラスになる
に従い、つまり、缶蓋より缶底の方が耐圧強度が低い組
み合わせから、缶蓋より缶底の方が耐圧強度が高い組み
合わせになるに従い、缶蓋変形の混入率が減っている。
そして、缶蓋から缶底の耐圧強度を引いた値が＋６０ｋ
ｐａ以上になったところで、初めて缶蓋変形の混入率が
０％になった。これにより、缶蓋の耐圧強度が缶底の耐
圧強度より６０ｋｐａ以上高い場合、言い換えると、缶
底の耐圧強度が缶蓋の耐圧強度より６０ｋｐａ以上低い
場合（実験例では、６０ｋｐａ、１００ｋｐａ、１２０
ｋｐａの場合）だけが、凍結適正の判定で合格（○）に
なった。As a result of the experiment, as shown in FIG. 2, as the value obtained by subtracting the pressure resistance of the can bottom from the can lid becomes negative to positive, that is, from the combination in which the pressure resistance of the can bottom is lower than that of the can lid, As the combination of the can bottom with higher pressure strength than the can lid becomes lower, the mixing ratio of the can lid deformation decreases.
The value obtained by subtracting the pressure resistance of the can bottom from the can lid is + 60k.
When the pressure became equal to or more than pa, the mixing ratio of the deformation of the can lid became 0% for the first time. Accordingly, when the pressure resistance of the can lid is higher than the pressure resistance of the can bottom by 60 kpa or more, in other words, when the pressure resistance of the can bottom is lower than the pressure resistance of the can lid by 60 kpa or more (in the experimental example, 60 kpa, 100 kpa, 120 kPa).
Only in the case of kpa), it passed (o) in the determination of the appropriateness of freezing.
【００１６】一方、本試験に用いたビールの充填設備に
おける容器内圧の最高到達圧は６００ｋｐａであり、そ
れにより缶蓋及び缶底の耐圧強度は最高到達圧以上でな
ければならない。そこで、耐圧適正の判定では、組み合
わせＮＯ．１と、組み合わせＮＯ．２の場合は、缶蓋の
耐圧強度がその条件を満足していないので不合格（×）
とした。同様に、組み合わせＮＯ．９は、一応缶底の耐
圧強度が最高到達圧の６００ｋｐａ以上であるが、製缶
時や充填時の変動を考慮すると安全を見なければならな
いので、不合格（×）とした。この場合の安全圏として
は、＋２０ｋｐａ、つまり６００＋２０＝６２０ｋｐａ
以上であれば十分であると言える。従って、総合判定で
は、組み合わせＮＯ．７とＮＯ．８の２つの場合が合格
（○）となった。On the other hand, the maximum ultimate pressure of the internal pressure of the container in the beer filling equipment used in this test is 600 kpa, so that the pressure resistance of the can lid and the can bottom must be higher than the maximum ultimate pressure. Therefore, in the determination of the appropriate pressure resistance, the combination NO. 1 and combination NO. In the case of 2, the pressure resistance of the can lid did not satisfy the condition, so it was rejected (×)
And Similarly, the combination NO. In No. 9, although the pressure resistance of the bottom of the can was temporarily equal to or higher than the highest ultimate pressure of 600 kpa, safety must be considered in consideration of fluctuations during can-making and filling, so it was rejected (x). In this case, the safety zone is +20 kpa, that is, 600 + 20 = 620 kpa.
It can be said that the above is sufficient. Therefore, in the comprehensive judgment, the combination NO. 7 and NO. The two cases of No. 8 were passed (o).
【００１７】合格になった組み合わせは、缶蓋の耐圧強
度が７２０ｋｐａで缶底の耐圧強度が６６０ｋｐａの場
合と、缶蓋の耐圧強度が７２０ｋｐａで缶底の耐圧強度
が６２０ｋｐａの場合である。The combinations that have passed are the case where the pressure resistance of the can lid is 720 kpa and the pressure resistance of the can bottom is 660 kpa, and the case where the pressure resistance of the can lid is 720 kpa and the pressure resistance of the can bottom is 620 kpa.
【００１８】[0018]
【発明の効果】以上説明したように、本発明によれば、
缶底の耐圧強度を缶蓋の耐圧強度よりも所定圧力以上低
く設定したので、内容物が凍結したときに、缶底を先に
変形させて、缶蓋を変形させないようにすることができ
る。従って、たとえ内容物が凍結した場合であっても、
缶が開けにくくなったり、スコア破断を生じて内容物が
吹き出したりするようなことが防げる。As described above, according to the present invention,
Since the pressure resistance of the can bottom is set lower than the pressure resistance of the can lid by a predetermined pressure or more, when the contents are frozen, the can bottom can be deformed first so that the can lid is not deformed. Therefore, even if the contents are frozen,
It is possible to prevent the can from being difficult to open or the contents from being blown out due to breakage of the score.
【図１】 本発明の実施形態の飲料缶の側面図である。FIG. 1 is a side view of a beverage can according to an embodiment of the present invention.
【図２】 本発明の実施形態の飲料缶と比較例の実験結
果の表を示す図である。FIG. 2 is a diagram showing a table of experimental results of the beverage can of the embodiment of the present invention and a comparative example.
【図３】 一般的な飲料缶の側面図である。FIG. 3 is a side view of a general beverage can.
【図４】 一般的な飲料缶の缶蓋を示す平面図である。FIG. 4 is a plan view showing a can lid of a general beverage can.
【図５】 従来の飲料缶の凍結時の変形状態を示す斜視
図である。FIG. 5 is a perspective view showing a deformed state of a conventional beverage can when frozen.
１ 缶胴 ２ 缶底 ３ 缶蓋 1 can body 2 can bottom 3 can lid
Claims (2)
端に、容易開口式の缶蓋を巻き締めにより装着した飲料
缶において、 前記缶底の耐圧強度を、缶蓋の耐圧強度よりも所定圧力
以上低く設定したことを特徴とする飲料缶。1. A beverage can in which an easy-opening can lid is attached to the open end of a cylindrical can body integrally having a can bottom by tightening, the pressure resistance of the can bottom is determined by the pressure resistance of the can lid. A beverage can set at a pressure lower than a predetermined pressure.
よりも６０ｋｐａ以上低く設定すると共に、内容物充填
設備における缶内圧の最高到達圧力よりも２０ｋｐａ以
上高く設定したことを特徴とする請求項１記載の飲料
缶。2. The pressure resistance of the bottom of the can is set at least 60 kpa lower than the pressure resistance of the can lid, and the pressure is set at least 20 kpa higher than the maximum attainable internal pressure of the content filling facility. The beverage can according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35808399A JP3916822B2 (en) | 1999-12-16 | 1999-12-16 | Beverage cans |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35808399A JP3916822B2 (en) | 1999-12-16 | 1999-12-16 | Beverage cans |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001171639A true JP2001171639A (en) | 2001-06-26 |
| JP3916822B2 JP3916822B2 (en) | 2007-05-23 |
Family
ID=18457459
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP35808399A Expired - Lifetime JP3916822B2 (en) | 1999-12-16 | 1999-12-16 | Beverage cans |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3916822B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008087821A (en) * | 2006-10-02 | 2008-04-17 | Universal Seikan Kk | Bottle can and bottle can with cap |
-
1999
- 1999-12-16 JP JP35808399A patent/JP3916822B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008087821A (en) * | 2006-10-02 | 2008-04-17 | Universal Seikan Kk | Bottle can and bottle can with cap |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3916822B2 (en) | 2007-05-23 |
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