JPH06127547A - Metallic lid of can - Google Patents
Metallic lid of canInfo
- Publication number
- JPH06127547A JPH06127547A JP27852692A JP27852692A JPH06127547A JP H06127547 A JPH06127547 A JP H06127547A JP 27852692 A JP27852692 A JP 27852692A JP 27852692 A JP27852692 A JP 27852692A JP H06127547 A JPH06127547 A JP H06127547A
- Authority
- JP
- Japan
- Prior art keywords
- score
- tab
- line
- score line
- lid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Landscapes
- Containers Opened By Tearing Frangible Portions (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、缶の金属製蓋、特に開
口用スコア線における破裂強度を向上させる金属製蓋の
構造に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal lid for a can, and more particularly to a structure of a metal lid for improving the burst strength at the opening score line.
【０００２】[0002]
【従来の技術】現在、缶の金属製蓋、特に飲料用缶の蓋
において、蓋の中央板部の中央側から外周側にわたって
刻まれたスコア線で囲まれた開口予定部を形成し、この
開口予定部の一部に又はその外側に固定されたタブを引
き上げることにより、この開口予定部を上方へ蓋体から
引き離し、或は開口予定部を缶内に押し込み、蓋の一部
に開口を形成するＥＯＥ（イージーオープンエンド）タ
イプが汎用されている。ここで、前記ＥＯＥタイプの缶
蓋は、通常タブを指で引き上げ、開口予定部の周囲に形
成されたスコア線に沿って該開口予定部を中央板部から
引き離す。このため、タブを引き上げる指の力で容易に
開口予定部を中央板部から切り離せるように、前記スコ
ア線における缶蓋の残厚を薄く形成しなければならな
い。2. Description of the Related Art At present, in metal lids of cans, particularly lids of beverage cans, a predetermined opening portion surrounded by score lines formed from the central side to the outer peripheral side of the central plate portion of the lid is formed. By pulling up the tab fixed to a part of the opening planned part or on the outside thereof, the planned opening part is pulled upward from the lid body, or the planned opening part is pushed into the can to open the opening in a part of the lid. The EOE (Easy Open End) type to be formed is widely used. Here, in the EOE type can lid, the tab is usually pulled up by a finger, and the planned opening portion is separated from the central plate portion along a score line formed around the planned opening portion. Therefore, the remaining thickness of the can lid on the score line must be thin so that the planned opening portion can be easily separated from the central plate portion by the force of the finger pulling up the tab.
【０００３】ところで、缶の内容物が炭酸飲料などの場
合、缶に運搬等による振動を与えたり、或は高温場所に
長時間放置しておくことにより缶内圧が非常に高くなっ
てしまう。When the content of the can is a carbonated beverage or the like, the internal pressure of the can becomes extremely high if the can is vibrated by transportation or left in a high temperature place for a long time.
【０００４】このため、前記スコア残厚を極薄に形成す
ると、非常に高くなった缶内圧によりスコア線が破裂
し、内容物の噴出を生じてしまうことがある。For this reason, if the remaining score thickness is made extremely thin, the score line may burst due to the extremely high internal pressure of the can, and the contents may be ejected.
【０００５】一方、高い缶内圧に耐えるようにスコア残
厚を厚くしてしまうと、指の力では容易に開口予定部を
切り離せないという問題が残ってしまう。On the other hand, if the remaining score thickness is increased so as to withstand a high internal pressure of the can, there remains a problem that the planned opening portion cannot be easily separated by the force of the finger.
【０００６】そこで、従来においても、各種の改良がな
されてきた（特公昭５２−２１９８４，特開昭５１−４
６２７２，実開昭６１−１４１１４７，実開昭６２−１
３２９２７，実開昭６２−３４２８，実公昭５０−３９
３１１，特開昭５８−１７１３３９，特開昭６０−９０
１３２，特開昭６４−４５２５０，特開昭６４−４５２
５１など）。Therefore, various improvements have been made in the past (Japanese Patent Publication No. 52-21984, Japanese Patent Laid-Open No. 51-4).
6272, actual development 61-141147, actual development 62-1
32927, Actual Development Sho 62-3428, Actual Public Sho 50-39
311, JP-A-58-171339, JP-A-60-90
132, JP-A-64-45250, JP-A-64-452
51).
【０００７】これらの手段を大別すると、一つの手段と
しては缶内圧増加時に缶内容積を大きくするバッファ部
分を形成するものであり、他の手段としては缶の耐圧強
度を向上させるものである。When these means are roughly classified, one means is to form a buffer portion for increasing the internal volume of the can when the internal pressure of the can is increased, and the other means is to improve the pressure resistance of the can. .
【０００８】[0008]
【発明が解決しようとする課題】しかしながら、上記各
種改良によっても、未だ缶内圧の急激な上昇があった場
合、スコア線が破断し、内容物の噴出等が生じる場合が
見られた。However, even with the above-mentioned various improvements, it was observed that the score line was broken and the contents spouted when the internal pressure of the can rapidly increased.
【０００９】即ち、本発明者が缶開口部（スコア線部
分）の破裂現象について研究した結果、破裂に先立ち缶
蓋面の中央板部の一部が外方へ尖頭状に突出する「角出
し」が観察され、この角出しの尖頭状部分がスコア線部
分にかかった場合に過大な負荷をかける結果、スコア線
破裂が生じることが明らかとなった。That is, as a result of the present inventor's research on the rupture phenomenon of the can opening (score line portion), a "corner" in which a part of the central plate portion of the can lid surface protrudes outward in a pointed shape prior to the rupture. It was clarified that the "bulging" was observed, and when the pointed portion of the bulging was applied to the score line portion, an excessive load was applied, resulting in score line rupture.
【００１０】したがって、従来技術のように、角出しを
生じにくくするように圧力を逃すバッファ部分を形成さ
せたり、また、蓋の耐角出し強度を向上させたりする改
良を行なっても、缶の寸法，内容物充填量確保，成形性
の観点，使用材料節減の観点などから容積拡大代や耐圧
強度向上には限度がある以上、角出し限度を超えるよう
な缶内圧の急激な上昇があった場合、蓋体で最も強度の
弱いスコア線部分に応力が集中し、スコア線部分にかか
って角出しが生じ、スコア線破裂に至る。Therefore, even when the buffer portion for releasing the pressure is formed so as to make the cornering less likely to occur and the lid is improved in the cornering resistance, the can of the can can be improved. There was a limit to the volume expansion allowance and pressure resistance improvement from the viewpoints of dimensions, securing the filling amount of contents, moldability, and saving of used materials. In this case, stress concentrates on the score line portion with the weakest strength in the lid, and the score line portion is bulged, leading to score line rupture.
【００１１】本発明は、前記従来技術の課題に鑑みなさ
れたものであり、その目的とするところは、中央板部の
一部にスコア線で囲まれた開口予定部を有するＥＯＥタ
イプの金属製蓋において、タブを指で引き上げる時に容
易に開口予定部が開口されるようにスコア残厚を極薄に
形成しながら、缶内圧が非常に高くなってもスコア線部
分からの破裂を防止することにある。The present invention has been made in view of the above-mentioned problems of the prior art, and an object thereof is to make an EOE type metal having a planned opening portion surrounded by a score line in a part of a central plate portion. To prevent the rupture from the score line part even if the internal pressure of the can becomes extremely high while forming the remaining thickness of the score very thin so that the planned opening part will be opened easily when pulling up the tab with your finger. It is in.
【００１２】[0012]
【課題を解決するための手段】前記課題を解決するため
に、本発明の缶の金属製蓋では、スコア線破裂に先立ち
缶蓋の中央板部の一部が外方へ尖頭状に突出する角出し
現象が、意図的にスコア線から離れた中央板部の特定位
置に生じるように、この特定位置に角出しが発生しやす
い小ビード部を予め形成しておく構成とした。In order to solve the above-mentioned problems, in the metal lid of the can of the present invention, a part of the central plate portion of the can lid projects outwardly in a pointed shape before the score line ruptures. A small bead portion that is likely to cause cornering is formed in advance so that the cornering phenomenon described above intentionally occurs at a specific position of the central plate portion that is distant from the score line.
【００１３】すなわち、缶の開口縁部に係止させるため
外周囲に設けられたフランジ部と、該フランジ部に囲ま
れた中央板部と、該中央板部の中央側から外周側にわた
って刻まれたスコア線で囲まれて形成された開口予定部
と、前記中央板部の略中央にリベット部により固定さ
れ、その大部分が該開口予定部の外側に配置されたタブ
と、を有する缶の金属製蓋において、前記リベット部の
中心部を通り、中央板部をタブ側とスコア側とに分ける
中心線を境に、タブ側の中央板部の縁部に該タブを挟み
少なくとも一対のタブ側小ビード部を、またスコア側の
中央板部の縁部に前記開口予定部を挟み少なくとも一対
のスコア側小ビード部をそれぞれ設けると共に、前記タ
ブ側小ビード部を、前記中心線から左右両側に３０度乃
至４０度の位置に、また前記スコア側小ビード部を、前
記中心線から３５度乃至４５度の位置にそれぞれ設けた
ことを特徴とする。That is, a flange portion provided on the outer periphery for engaging with the opening edge of the can, a central plate portion surrounded by the flange portion, and a central plate portion from the center side to the outer peripheral side are carved. Of a can having a predetermined opening portion surrounded by a score line and a tab fixed to the center of the central plate portion by a rivet portion, most of which is arranged outside the predetermined opening portion. In a metal lid, at least a pair of tabs sandwiching the tab at the edge of the central plate portion on the tab side, with a center line passing through the central portion of the rivet portion and dividing the central plate portion into a tab side and a score side. Side small beads, and at least a pair of score small beads sandwiching the planned opening portion at the edge of the center plate on the score side, and the tab small beads are located on the left and right sides of the center line. At 30 to 40 degrees, The score side small bead portions, characterized in that provided at positions of 35 degrees to 45 degrees from the center line.
【００１４】[0014]
【作用】缶内容物が炭酸飲料等であって、温度上昇や振
動により缶内圧が非常に高くなる時、蓋体で最も強度の
弱いタブ側小ビード部とスコア側小ビード部に応力が集
中し、缶内圧により外方へ尖頭状に突出する「角出し」
が発生する。[Function] When the can contents are carbonated drinks, etc., and when the internal pressure of the can becomes extremely high due to temperature rise or vibration, stress concentrates on the tab-side small beads and score-side small beads where the strength is weakest. However, due to the pressure inside the can, it projects outwardly in a pointed shape, which is called "horning".
Occurs.
【００１５】しかし、タブ側小ビード部を、リベット部
の中心部を通り、中央板部をタブ側とスコア側とに分け
る中心線から左右両側に３０度乃至４０度の位置に、ま
たスコア側小ビード部を、前記中心線から３５度乃至４
５度の位置にそれぞれ設けたために、この角出しの尖頭
状部分がスコア線部分から最も離れた位置で複数発生す
ることになり、そのため、尖頭状部分がスコア線部分に
まで及ばないのでスコア線部分に過大な負荷をかけるこ
とがない。However, the tab side small bead portion passes through the center of the rivet portion, and is located at a position of 30 to 40 degrees to the left and right from the center line that divides the center plate portion into the tab side and the score side, and the score side. The small bead portion is 35 degrees to 4 degrees from the center line.
Since they are provided at the positions of 5 degrees, respectively, a plurality of cusp-shaped points of this corner are generated at the position farthest from the score line portion. Therefore, the pointed portions do not reach the score line portion. Do not overload the score line.
【００１６】この結果、角出しを生じる圧力は従来の缶
の蓋と同等あるいはむしろ低下するにもかかわらず、角
出しがスコア線近傍部分には生じないため、スコア線部
分における破裂は極めて生じにくくなるのである。As a result, although the pressure that causes cornering is equal to or even lower than that of the conventional can lid, cornering does not occur in the vicinity of the score line, so that rupture in the score line is extremely unlikely to occur. It will be.
【００１７】なお、この角出し誘導のためには、ビード
部を蓋上の極めて限定した位置にのみ形成する必要があ
り、これ以外の部分に形成した場合には、むしろスコア
線部分における破裂を生じやすくなる可能性もある。In order to guide the cornering, it is necessary to form the bead portion only at a very limited position on the lid, and when it is formed at a portion other than this, it is rather ruptured at the score line portion. It may also occur easily.
【００１８】[0018]
【実施例】以下、図面に基づいき本発明の好適な実施例
について説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings.
【００１９】まず、構成を説明する。First, the structure will be described.
【００２０】図１には、本発明の一実施例に係る金属製
蓋の概略構成図が示されており、同図（Ａ）は外表面の
平面図であり、同図（Ｂ）は同図（Ａ）のＩ−Ｉ線での
断面図であり、同図（Ｃ）は金属製蓋に設けた開口予定
部の形状とリベット部の位置を示す平面図である。な
お、図１（Ｂ）の○で囲んだ部分の詳細は図２（Ａ）に
示されている。FIG. 1 shows a schematic configuration diagram of a metal lid according to an embodiment of the present invention. FIG. 1 (A) is a plan view of the outer surface and FIG. 1 (B) is the same. FIG. 11 is a cross-sectional view taken along the line I-I of FIG. (A), and FIG. (C) is a plan view showing the shape of the planned opening portion and the position of the rivet portion provided on the metal lid. Note that the details of the portion circled in FIG. 1 (B) are shown in FIG. 2 (A).
【００２１】図１に示す蓋１０は、蓋１０の外周にフラ
ンジ部１２が形成され、フランジ部１２に囲まれた内側
に中央板部１４が形成されている。In the lid 10 shown in FIG. 1, a flange portion 12 is formed on the outer periphery of the lid 10, and a central plate portion 14 is formed inside the flange portion 12 and surrounded by the flange portion 12.
【００２２】また、中央板部１４の一部には略中心部か
ら外周方向へとスコア線１６が形成され、スコア線１６
により一部を残して囲まれた部分が開口予定部１８とな
っている。そして、開口予定部１８の外側の近傍位置で
ある蓋１０のほぼ中心位置に、蓋１０の内方から外方へ
突出させて形成したリベット部２０によりタブ２２が固
定されている。A score line 16 is formed in a part of the central plate portion 14 from the substantially central portion toward the outer peripheral direction.
Due to this, the part surrounded by the part is the planned opening part 18. The tab 22 is fixed to the lid 10 by a rivet portion 20 formed so as to project from the inside to the outside of the lid 10 at a position near the outside of the planned opening portion 18 and substantially at the center position of the lid 10.
【００２３】また、タブ２２は、一端が開口予定部１８
の上方領域まで、他端が中央板部１４の縁部付近までそ
れぞれ伸長しており、前記他端にはタブ２２を上方へ引
き上げる際に指などを係止させるための指係止部２４が
形成されている。更に、中央板部１４には、開口予定部
１８及びタブ２２を縁どるように若干の段差をつけたへ
こみパネル部２６が形成されている。Further, the tab 22 has a planned opening portion 18 at one end.
To the upper region of the central plate portion 14, and the other end extends to the vicinity of the edge of the central plate portion 14, and the other end is provided with a finger locking portion 24 for locking a finger or the like when pulling up the tab 22 upward. Has been formed. Further, the central plate portion 14 is formed with a dent panel portion 26 having a slight step so as to frame the planned opening portion 18 and the tab 22.
【００２４】このため、指係止部２４を引き上げること
により、最初は開口予定部１８上のタブ２２の一端を支
点としリベット部２０を作用点とするテコ作用により、
次にタブ２２の一端を作用点とし、リベット部２０を支
点とするテコ作用により開口予定部１８の周りのスコア
線１６部分が破断し、開口予定部１８が押下げられて開
口させられる（所謂ステイオンタブタイプのものであ
る。）。Therefore, by pulling up the finger engaging portion 24, the lever action is initially performed with one end of the tab 22 on the planned opening portion 18 as a fulcrum and the rivet portion 20 as an action point.
Next, the score line 16 portion around the planned opening portion 18 is broken by a lever action using one end of the tab 22 as an action point and the rivet portion 20 as a fulcrum, and the planned opening portion 18 is pushed down to be opened (so-called. Steion tab type.)
【００２５】本実施例において特徴的なことは、フラン
ジ部１２に囲まれた中央板部１４の縁部に微小な窪みで
ある小ビード部２８を形成したことである。A feature of this embodiment is that a small bead portion 28, which is a minute depression, is formed at the edge portion of the central plate portion 14 surrounded by the flange portion 12.
【００２６】即ち、図２（Ａ）に示すように前記リベッ
ト部２０の中心を通るＩ−Ｉ線を境に、タブ２２の指係
止部２４側（以下タブ側）の縁部にタブ２２を挟み２つ
のタブ側小ビード部２８ａ，２８ｂが、また開口予定部
１８側（以下スコア側）の縁部に開口予定部１８を挟み
２つのスコア側小ビード部２８ｃ，２８ｄがそれぞれ形
成されている。That is, as shown in FIG. 2A, the tab 22 is formed at the edge of the tab 22 on the finger engaging portion 24 side (hereinafter referred to as the tab side) with the line I-I passing through the center of the rivet portion 20 as a boundary. 2 tab-side small bead portions 28a and 28b are formed, and two score-side small bead portions 28c and 28d are formed at the edge of the planned opening portion 18 side (score side) with the planned opening portion 18 sandwiched therebetween. There is.
【００２７】なお、ここでビード部２８は、図２は示さ
れるように形成される。即ち、図２（Ａ）に示すよう
に、ビード部２８はポンチ５０により押打されることに
より、０．４mm程度の深さの凹状に形成される。なお、
ポンチ先端縦断面は同図（Ｂ）に示すように半径Ｒ＝
０．９mm程度の半円状に形成され、このためビード幅は
約１．５mm程度である。Here, the bead portion 28 is formed as shown in FIG. That is, as shown in FIG. 2A, the bead portion 28 is pressed by the punch 50 to be formed into a concave shape having a depth of about 0.4 mm. In addition,
The vertical section of the punch tip has a radius R =
The bead width is about 1.5 mm because it is formed in a semicircular shape of about 0.9 mm.
【００２８】次に、作用について説明する。Next, the operation will be described.
【００２９】［凸状Ｒ部の設定］前記蓋１０のようなＥ
ＯＥタイプの蓋は、主に飲料用缶に用いられるが、飲料
用缶の内容物が炭酸飲料等の場合、該炭酸飲料の温度が
上昇したり、或は振動を加えると缶内圧が非常に高くな
る。また、スコア残厚を厚くすれば前記スコア破裂強度
は増すが、タブ２２を指等で引き上げるようにスコア線
を切り離し開口予定部１８を開口させるためには、スコ
ア残厚が９５μｍ〜１２５μｍであることが好適であ
る。[Setting of convex R portion] E as in the lid 10
The OE type lid is mainly used for beverage cans, but when the contents of the beverage can are carbonated drinks, etc., the temperature inside the carbonated drink rises or the pressure in the can greatly increases when vibration is applied. Get higher Further, if the score residual thickness is increased, the score burst strength is increased, but in order to open the planned opening portion 18 by separating the score line so as to pull up the tab 22 with a finger or the like, the score residual thickness is 95 μm to 125 μm. Is preferred.
【００３０】そこで、スコア残厚が９５μｍ〜１２５μ
ｍであり前記小ビード部２８が形成されていない従来の
蓋を用いて、まず、前記図１に示す中央板部１４の周囲
に設けられた凸状Ｒ部２９の曲率（半径mm) を種々変更
した場合のスコア破裂強度及び角出し圧力を測定した。Therefore, the remaining score thickness is 95 μm to 125 μm.
m and using the conventional lid in which the small bead portion 28 is not formed, various curvatures (radius mm) of the convex R portion 29 provided around the central plate portion 14 shown in FIG. The burst strength of the score and the pressure at which the score was changed were measured.
【００３１】表１には実験を行ったサンプル蓋の明細が
示されており、表２にはそれぞれのサンプル蓋の測定結
果が示されている。なお、スコア残厚の測定点Ｐ，Ｑ，
Ｒ，Ｓは、図１の（Ｃ）に示す箇所である。Table 1 shows the details of the sample lids used for the experiment, and Table 2 shows the measurement results of the respective sample lids. In addition, the measurement points P, Q, and
R and S are locations shown in FIG.
【００３２】[0032]
【表１】 [Table 1]
【００３３】[0033]
【表２】 [Table 2]
【００３４】前記表２から明らかなように、凸状Ｒ部２
９を従来の半周に０．３８mmから半周に０．４５mm及び
全周に０．７０mmと滑らかにした場合、スコア破裂強度
が高くなり好適であることが理解されるが、スコア破裂
強度は８．０kg/cm2には達していない。As is clear from Table 2, the convex R portion 2
It is understood that when 9 is smoothed from 0.38 mm in the conventional half circumference to 0.45 mm in the half circumference and 0.70 mm in the entire circumference, the score burst strength becomes high, which is preferable, but the score burst strength is 8. It has not reached 0 kg / cm 2 .
【００３５】［小ビード部の位置設定］そこで、次に前
記表１に示したサンプル蓋に前記小ビード部２８を形成
した本実施例に係る蓋１０のスコア破裂強度及び角出し
圧力を測定した。[Position setting of small bead portion] Then, the score burst strength and the cornering pressure of the lid 10 according to this embodiment in which the small bead portion 28 is formed on the sample lid shown in Table 1 were measured. .
【００３６】ここで、前記小ビード部２８の形成工程
で、前記図１に示す４つの小ビード部２８ａ，２８ｂ，
２８ｃ，２８ｄの形成位置を種々変更して、スコア破裂
強度を測定し、好適な形成位置を検討した。Here, in the step of forming the small bead portion 28, the four small bead portions 28a, 28b, shown in FIG.
The formation position of 28c and 28d was variously changed, the score burst strength was measured, and the suitable formation position was examined.
【００３７】まず、前記図１に示すリベット部の中心を
通るＩ−Ｉ線を中心線とし、タブ側小ビード２８ａ，２
８ｂとスコア側小ビード２８ｃ，２８ｄを対象位置に形
成した。即ち、タブ側小ビード部２８ａ，２８ｂとリベ
ット部２０の中心を結んだそれぞれの線と前記Ｉ−Ｉ線
とがなす角度ｉ1 と、スコア側小ビード部２８ｃ，２８
ｄとリベット部２０の中心を結んだそれぞれの線と前記
Ｉ−Ｉ線とがなす角度ｉ2 とを同角とした。First, with the I-I line passing through the center of the rivet portion shown in FIG. 1 as the center line, the tab side small beads 28a, 2 are formed.
8b and the small beads on the score side 28c and 28d were formed at the target positions. That is, the angle i 1 formed by each line connecting the centers of the tab-side small bead portions 28a and 28b and the rivet portion 20 and the line I-I, and the score-side small bead portions 28c and 28.
An angle i 2 formed by each line connecting d and the center of the rivet portion 20 and the line I-I is the same.
【００３８】図３には、前記角度ｉ1 、ｉ2 の変化によ
るスコア破裂強度及び角出し圧力が示されている。な
お、図３中の角度０とは小ビード部を図１のＩ−Ｉ線上
に設けた場合のスコア破裂強度と角出し圧力を示す。FIG. 3 shows the score burst strength and the blasting pressure depending on the changes in the angles i 1 and i 2 . Note that the angle 0 in FIG. 3 indicates the score burst strength and the squeezing pressure when the small bead portion is provided on the line II of FIG.
【００３９】同図から明らかなように、前記角度ｉ1 ，
ｉ2 が３０度まではスコア破裂強度の改善に顕著な効果
はみられないが、４０度，４５度では８．０kg/cm2以上
となり、５０度では、逆に７．５kg/cm2へと低下した。
以上の結果から角度ｉ1 ，ｉ2は、４０度〜４５度前後
が好適であることが理解される。As is clear from the figure, the angles i 1 ,
No significant effect on the improvement of the score burst strength is observed up to i 2 of 30 degrees, but it becomes 8.0 kg / cm 2 or more at 40 degrees and 45 degrees, and conversely reaches 7.5 kg / cm 2 at 50 degrees. And fell.
From the above results, it is understood that the angles i 1 and i 2 are preferably around 40 ° to 45 °.
【００４０】なお、角出し圧力は、４０度，４５度にお
いて若干低下しており、スコア線から離れた位置に角出
しを誘導することにより、スコア破裂強度を向上させて
いることが理解される。The squeezing pressure is slightly decreased at 40 ° and 45 °, and it is understood that the score rupture strength is improved by inducing the squeezing to a position away from the score line. .
【００４１】さらに、前記角度ｉ1 と角度ｉ2 をそれぞ
れ独立して変えて、種々の組み合わせによるスコア破裂
強度及び角出し圧力を測定した。その結果が図４に示さ
れている。Further, the angle i 1 and the angle i 2 were changed independently of each other, and the score burst strength and the squeezing pressure were measured by various combinations. The result is shown in FIG.
【００４２】同図から明らかなように、角度ｉ1 が３５
度で、角度ｉ2 が４０度の場合が最もスコア破裂強度が
高く、好適であることが理解される。As is clear from the figure, the angle i 1 is 35
It is understood that in terms of degrees, the score burst strength is the highest when the angle i 2 is 40 degrees, which is preferable.
【００４３】表３には、前記表１に示したサンプル蓋に
タブ側小ビート部２８ａ，２８ｂを角度ｉ1 が３５度位
置に、またスコア側小ビート部２８ｃ，２８ｄを角度ｉ
2 が４０度位置に形成した蓋１０のスコア破裂強度及び
角出し圧力が示されている。In Table 3, the tab-side small beat portions 28a and 28b are provided at the angle i 1 of 35 degrees on the sample lid shown in Table 1 and the score-side small beat portions 28c and 28d are provided at the angle i.
The score rupture strength and the squeezing pressure of the lid 10 in which 2 is formed at the 40 degree position are shown.
【００４４】[0044]
【表３】 [Table 3]
【００４５】前記表３から明らかなように、小ビート部
２８を形成することによって、スコア破裂強度は約０．
７〜１．０kg/cm2向上し、サンプル１〜３においてスコ
ア破裂強度８．０kg/cm2以上が得られた。As is clear from Table 3, by forming the small beat portion 28, the score burst strength is about 0.
It improved by 7 to 1.0 kg / cm 2 , and score burst strength of 8.0 kg / cm 2 or more was obtained in Samples 1 to 3.
【００４６】次に、効果を説明する。Next, the effect will be described.
【００４７】（１）中央板部１４の中央側から外周側に
わたって刻まれたスコア線１６で囲まれた開口予定部１
８を有するＥＯＥタイプの金属製の蓋１０において、ス
コア線１６の破裂に先立ち蓋１０の中央板部１４の一部
が外方へ尖頭状に突出する角出し現象が、意図的にスコ
ア線１６から離れた中央板部１４の特定位置に生じるよ
うに、この特定位置に角出しが発生しやすい小ビード部
２８ａ，２８ｂ，２８ｃ，２８ｄを予め形成しておく構
成としたため、タブ２２を指で引き上げる時に容易に開
口予定部１８が開口されるようにスコア残厚を極薄に形
成しながら、缶内の炭酸飲料の温度上昇や振動などによ
り缶内圧が非常に高くなってもスコア線１６の部分から
の破裂を防止することができる。(1) A planned opening portion 1 surrounded by a score line 16 engraved from the center side to the outer peripheral side of the central plate portion 14.
In the EOE type metal lid 10 having 8 points, the scoring phenomenon in which a part of the central plate portion 14 of the lid 10 projects outward in a pointed shape prior to the rupture of the score line 16, is intentionally scored. Since the small bead portions 28a, 28b, 28c, 28d, which are likely to cause cornering at this specific position, are formed in advance so as to occur at a specific position on the central plate portion 14 away from the tab 16, the tab 22 can be finger-tipped. Even if the pressure inside the can becomes very high due to the temperature rise and vibration of the carbonated drink in the can, the score line 16 is formed so that the remaining score thickness is extremely thin so that the planned opening 18 is easily opened when pulling up with. It is possible to prevent rupture from the part.
【００４８】（２）従来の蓋に対し小ビード部２８ａ，
２８ｂ，２８ｃ，２８ｄを形成するだけの構成としてい
るため、部品の追加や製造ラインの大幅変更などを要す
ることなく、従来の各種改良に比べてコスト的に有利と
しながら、炭酸飲料缶などで要求の高いスコア線部分か
らの破裂を防止することができる。(2) A small bead portion 28a, which is different from the conventional lid.
28b, 28c, and 28d are simply formed, so that there is no need to add parts or drastically change the manufacturing line, and it is cost-effective compared to various conventional improvements, but is required for carbonated beverage cans and the like. It is possible to prevent the rupture from the high score line part.
【００４９】以上、本発明の好適な実施例を図面により
説明してきたが、具体的な構成は実施例に限られるもの
ではない。The preferred embodiment of the present invention has been described above with reference to the drawings, but the specific configuration is not limited to the embodiment.
【００５０】例えば、開口予定部を缶内に押し込むタイ
プの缶蓋の実施例を示したが、開口予定部を蓋から上方
へ引き離すタイプの缶蓋にも適用できるのは勿論であ
る。For example, although the embodiment of the can lid in which the planned opening portion is pushed into the can has been shown, it goes without saying that the present invention is also applicable to a can lid in which the planned opening portion is pulled upward from the lid.
【００５１】また、タブ側小ビード部は、中心線から左
右両側に３０度乃至４０度の位置に、またスコア側小ビ
ード部は、中心線から３５度乃至４５度の位置にそれぞ
れ設けたものであれば本発明に含まれる。Further, the tab-side small beads are provided at positions of 30 to 40 degrees from the center line to the left and right sides, and the score-side small beads are provided at positions of 35 to 45 degrees from the center line. If so, it is included in the present invention.
【００５２】また、実施例では、タブ側小ビード部及び
スコア側小ビード部をそれぞれ左右一対設けた例を示し
たが、二対や三対など複数対設けたものも含まれる。
尚、複数対小ビード部を設けた場合、少なくとも１つの
小ビート部の設定位置が上記角度範囲に含まれていれば
よい。Further, in the embodiment, the example in which the tab-side small bead portion and the score-side small bead portion are provided in right and left pairs respectively, but a plurality of pairs such as two pairs and three pairs are also included.
When a plurality of pairs of small bead portions are provided, the setting position of at least one small beat portion may be included in the above angle range.
【００５３】さらに、小ビード部の周囲に角出しを助長
するような構造を設けたり、小ビード部の周囲に角出し
によるスコア線への負荷の波及を抑える構造を設けるよ
うにしてもよい。Furthermore, a structure may be provided around the small bead portion so as to promote cornering, or a structure may be provided around the small bead portion to suppress the influence of load on the score line due to cornering.
【００５４】[0054]
【発明の効果】以上説明したように、本発明にあって
は、中央板部の中央側から外周側にわたって刻まれたス
コア線で囲まれた開口予定部を有するＥＯＥタイプの缶
の金属製蓋において、缶内圧の上昇に起因するスコア線
破裂に先立ち発生する蓋の中央板部の一部が外方へ尖頭
状に突出する角出し現象が、意図的にスコア線から離れ
た中央板部の特定位置に生じるように、この特定位置に
角出しが発生しやすい小ビード部を予め形成しておく構
成としたため、タブを指で引き上げる時に容易に開口予
定部が開口されるようにスコア残厚を極薄に形成しなが
ら、缶内圧が非常に高くなってもスコア線部分からの破
裂を防止することができるという効果が得られる。As described above, according to the present invention, the metal lid of the EOE type can having the opening portion surrounded by the score line engraved from the central side to the outer peripheral side of the central plate portion. In the above, the horning phenomenon that a part of the central plate part of the lid that occurs prior to the rupture of the score line due to the increase in the internal pressure of the lid protrudes outward in a pointed shape is intentionally separated from the score line. Since a small bead part that easily causes cornering is formed in advance at this specific position, the score remains so that the planned opening part is easily opened when the tab is pulled up with your finger. It is possible to obtain an effect that it is possible to prevent the rupture from the score line portion even when the internal pressure of the can becomes extremely high while forming the thickness to be extremely thin.
【図１】本発明の一実施例にかかる蓋の概略構成図で、
図１（Ａ）は外表面の平面図であり、図１（Ｂ）は図１
（Ａ）のＩ−Ｉ線での断面図であり、図１（Ｃ）は金属
製蓋に設けた開口予定部の形状とリベット部の位置を示
す平面図である。FIG. 1 is a schematic configuration diagram of a lid according to an embodiment of the present invention,
FIG. 1A is a plan view of the outer surface, and FIG.
FIG. 1A is a cross-sectional view taken along the line I-I of FIG. 1A, and FIG. 1C is a plan view showing a shape of a planned opening portion provided on a metal lid and a position of a rivet portion.
【図２】本発明におけるビート部形成状態の説明図で、
図２（Ａ）は図１（Ｂ）の○で囲んだ部分の詳細図であ
り、図２（Ｂ）は小ビート部の形成説明図である。FIG. 2 is an explanatory view of a beat portion forming state in the present invention,
FIG. 2A is a detailed view of a portion surrounded by a circle in FIG. 1B, and FIG. 2B is an explanatory view of forming a small beat portion.
【図３】実施例の蓋で、タブ側小ビード部設定角度ｉ1
とスコア側小ビード部設定角度ｉ2 とを同角とし、その
角度を変えた場合のスコア破裂強度及び角出し圧力の比
較特性図である。FIG. 3 is a view showing the lid of the embodiment in which the tab side small bead portion setting angle i 1
And the score side small bead portion setting angle i 2 are set to the same angle, and when the angles are changed, a comparative characteristic diagram of score burst strength and squeezing pressure is shown.
【図４】実施例の蓋で、タブ側小ビード部設定角度ｉ1
とスコア側小ビード部設定角度ｉ2 とをそれぞれ変えた
場合のスコア破裂強度及び角出し圧力の比較特性図であ
る。FIG. 4 is a view showing the lid of the embodiment, in which the tab side small bead portion setting angle i 1 is set.
FIG. 7 is a comparative characteristic diagram of the score burst strength and the squeezing pressure when the and small score side small bead portion setting angles i 2 are changed.
１０ 蓋 １２ フランジ部 １４ 中央板部 １６ スコア線 １８ 開口予定部 ２０ リベット部 ２２ タブ ２４ 指係止部 ２６ へこみパネル部 ２８ 小ビート部 ２９ 凸状Ｒ部 DESCRIPTION OF SYMBOLS 10 Lid 12 Flange part 14 Central plate part 16 Score line 18 Planned opening part 20 Rivet part 22 Tab 24 Finger locking part 26 Dent panel part 28 Small beat part 29 Convex R part
Claims (1)
設けられたフランジ部と、 該フランジ部に囲まれた中央板部と、 該中央板部の中央側から外周側にわたって刻まれたスコ
ア線で囲まれて形成された開口予定部と、 前記中央板部の略中央にリベット部により固定され、そ
の大部分が該開口予定部の外側に配置されたタブと、 を有する缶の金属製蓋において、 前記リベット部の中心部を通り、中央板部をタブ側とス
コア側とに分ける中心線を境に、タブ側の中央板部の縁
部に該タブを挟み少なくとも一対のタブ側小ビード部
を、またスコア側の中央板部の縁部に前記開口予定部を
挟み少なくとも一対のスコア側小ビード部をそれぞれ設
けると共に、 前記タブ側小ビード部を、前記中心線から左右両側に３
０度乃至４０度の位置に、また前記スコア側小ビード部
を、前記中心線から３５度乃至４５度の位置にそれぞれ
設けたことを特徴とする缶の金属製蓋。1. A flange portion provided on an outer periphery for engaging with an opening edge portion of a can, a central plate portion surrounded by the flange portion, and a central plate portion extending from a central side to an outer peripheral side. And a tab that is fixed by a rivet at the approximate center of the center plate and that is mostly arranged outside the planned opening. In a metal lid, at least a pair of tabs sandwiching the tab at the edge of the central plate portion on the tab side, with a center line passing through the central portion of the rivet portion and dividing the central plate portion into a tab side and a score side. A small side bead portion is provided, and at least a pair of small score side bead portions sandwiching the planned opening portion are provided at the edge of the central plate portion on the score side, and the small tab side bead portion is provided on both left and right sides from the center line. To 3
A metal lid for a can, wherein the small bead portion on the score side is provided at a position of 0 to 40 degrees and at a position of 35 to 45 degrees from the center line, respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27852692A JPH06127547A (en) | 1992-10-16 | 1992-10-16 | Metallic lid of can |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27852692A JPH06127547A (en) | 1992-10-16 | 1992-10-16 | Metallic lid of can |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06127547A true JPH06127547A (en) | 1994-05-10 |
Family
ID=17598507
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27852692A Withdrawn JPH06127547A (en) | 1992-10-16 | 1992-10-16 | Metallic lid of can |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06127547A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4514073B2 (en) * | 2000-05-23 | 2010-07-28 | 大和製罐株式会社 | Molding method of can lid with identification mark |
| US8931660B2 (en) | 2001-07-03 | 2015-01-13 | Ball Corporation | Can shell and double-seamed can end |
-
1992
- 1992-10-16 JP JP27852692A patent/JPH06127547A/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4514073B2 (en) * | 2000-05-23 | 2010-07-28 | 大和製罐株式会社 | Molding method of can lid with identification mark |
| US8931660B2 (en) | 2001-07-03 | 2015-01-13 | Ball Corporation | Can shell and double-seamed can end |
| US9371152B2 (en) | 2001-07-03 | 2016-06-21 | Ball Corporation | Can shell and double-seamed can end |
| US10246217B2 (en) | 2001-07-03 | 2019-04-02 | Ball Corporation | Can shell and double-seamed can end |
| US10843845B2 (en) | 2001-07-03 | 2020-11-24 | Ball Corporation | Can shell and double-seamed can end |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20000104 |