JP7419746B2

JP7419746B2 - bottle cans

Info

Publication number: JP7419746B2
Application number: JP2019191662A
Authority: JP
Inventors: 達也花房; 貴志長谷川; 友明飯村
Original assignee: アルテミラ製缶株式会社
Priority date: 2018-10-22
Filing date: 2019-10-21
Publication date: 2024-01-23
Anticipated expiration: 2039-10-21
Also published as: JP2020066471A

Description

本発明は、開口部に金属製キャップが装着され、飲料等の内容物が充填されるボトル缶に関する。 The present invention relates to a bottle can with a metal cap attached to the opening and filled with contents such as a beverage.

飲料等の内容物が充填される容器として、ボトル形状の缶（ボトル缶）の開口部に、金属製キャップを装着して密封する容器が知られている。このボトル缶は、一般に、底部を有する円筒状胴部の開口部側に、上方へ向かうに従い漸次縮径する肩部、縮径部が設けられ、縮径部の上端に口部が設けられた構成とされている。このようなボトル缶は、金属板材（アルミニウム合金材料の板材）にカッピング工程（絞り工程）及びＤＩ工程（絞りしごき工程、Ｄｒａｗｉｎｇ＆Ｉｒｏｎｉｎｇ）を施すことにより、有底円筒状の缶体に形成され、その有底円筒状の缶体の胴部に縮径加工を施すことにより肩部及び縮径部が形成され、その後、雄ねじ部、カール部等を有する口部が形成される。 BACKGROUND ART As a container filled with contents such as a beverage, there is known a container in which a metal cap is attached to the opening of a bottle-shaped can (bottle can) to seal the opening. This bottle-can generally has a cylindrical body with a bottom, a shoulder portion and a diameter-reducing portion that gradually decrease in diameter toward the top on the opening side, and a mouth portion at the upper end of the reduced-diameter portion. It is said to be composed of Such bottle cans are formed into a bottomed cylindrical can body by subjecting a metal plate material (aluminum alloy material plate material) to a cupping process (drawing process) and a DI process (drawing & ironing process). A shoulder portion and a reduced diameter portion are formed by reducing the diameter of the body of the bottomed cylindrical can body, and then a mouth portion having a male screw portion, a curl portion, etc. is formed.

このようなボトル缶として、例えば、特許文献１に記載のボトル缶や特許文献２に記載のボトル缶が知られている。
特許文献１記載のボトル缶は、絞り且つしごき加工された側壁が、切頭円錐形部に続いており、切頭円錐形部は、上部に缶本体よりも直径の小さい首部を有し、その首部が、円筒状胴部に続いており、その円筒状胴部にねじが形成され、円筒状胴部の上方にビードが形成され、ねじの下方に環状ビードが形成されている。このボトル缶は、直径約７６ｍｍ、高さ約１８０ｍｍで約５９０ｍｌ入るように設計される。あるいは、直径が約５１ｍｍないし８３ｍｍ、高さが約８９ｍｍないし２５４ｍｍの範囲で、大体２０７ｍｌから９４６ｍｌ以上入ってもよいとも記載されている。
また、切頭円錐形首部は、真っ直ぐな切頭円錐首ではなく、複数の凹凸段またはリブがあるのが好ましいと記載されている。
一方、特許文献２記載のボトル缶は、胴部の上に、上端側に向かうに従い一定の傾斜で漸次縮径する円錐台面状の肩部と、この肩部からさらに上端側に向かって延びる筒状の首部と、首部の上端から外周側に張り出す膨出部、ネジ部およびカール部を備えたキャップ取付部（口部）とが形成されており、胴部の外径（直径）が、６４．２４ｍｍ～６８．２４ｍｍで、内容量が４１０ｍｌ用のボトル缶であるとされている。 As such bottle cans, for example, the bottle can described in Patent Document 1 and the bottle can described in Patent Document 2 are known.
In the bottle can described in Patent Document 1, a side wall that has been drawn and ironed continues to a truncated conical part, and the truncated conical part has a neck part having a smaller diameter than the can body at the upper part. A neck follows a cylindrical body with a thread formed therein, a bead formed above the cylindrical body, and an annular bead formed below the thread. This bottle is designed to have a diameter of about 76 mm, a height of about 180 mm, and a capacity of about 590 ml. Alternatively, it is also described that the diameter may range from about 51 mm to 83 mm, the height range from about 89 mm to 254 mm, and the volume may be approximately 207 ml to 946 ml or more.
It is also stated that the frusto-conical neck is preferably not a straight frusto-conical neck but has a plurality of uneven steps or ribs.
On the other hand, the bottle can described in Patent Document 2 has a truncated conical shoulder part on the body whose diameter gradually decreases at a constant slope toward the upper end side, and a cylinder extending from this shoulder part further toward the upper end side. A shaped neck portion, a cap attachment portion (mouth portion) including a bulging portion, a threaded portion, and a curled portion extending outward from the upper end of the neck portion are formed, and the outer diameter (diameter) of the body portion is It is said to be a bottle can with a diameter of 64.24 mm to 68.24 mm and an internal capacity of 410 ml.

特開２００６－０６２７５５号公報Japanese Patent Application Publication No. 2006-062755 特開２０１８－１３１２６１号公報JP2018-131261A

しかしながら、特許文献１記載のボトル缶では、円筒状胴部と、開口部を形成する小径の口部との間の縮径部分が階段状に形成されており、意匠性に劣る。特許文献２記載のボトル缶は、当該縮径部分が比較的滑らかに形成されているが、円錐台面状であるため、全体として角ばった印象を受ける。
また、このような階段状や円錐台面状の縮径部分を有するボトル缶の場合、飲料を注ぎ出すときに脈動が生じるおそれがある。特に、内容量が多くなると、脈動の影響が大きくなるので、注ぎ性を改善する必要が生じる。
さらに、内容量が多く、高さが大きくなるほど、キャッピング等の際の軸荷重によって変形が生じない強度も求められる。 However, in the bottle can described in Patent Document 1, the diameter-reduced portion between the cylindrical body and the small-diameter mouth portion forming the opening is formed in a step-like manner, resulting in poor design. Although the reduced diameter portion of the bottle described in Patent Document 2 is formed relatively smoothly, it has a truncated conical shape, giving an angular impression as a whole.
In addition, in the case of a bottle can having such a step-like or truncated cone-like reduced diameter portion, there is a risk that pulsation may occur when pouring out the beverage. In particular, as the content increases, the influence of pulsation increases, so it is necessary to improve pourability.
Furthermore, the greater the internal capacity and height, the greater the strength required to prevent deformation due to axial loads during capping and the like.

本発明は、このような事情に鑑みてなされたものであり、円筒状胴部と口部との間の縮径部分を滑らかでかつ柔らかい印象の外観とし、大容量であっても良好な注ぎ性を有し、かつ軸荷重に対する強度（コラム強度）も高いボトル缶を提供することを目的とする。 The present invention has been made in view of these circumstances, and provides a smooth and soft appearance to the reduced diameter portion between the cylindrical body and the mouth, thereby ensuring good pouring even in large volumes. The purpose of the present invention is to provide a bottle can that has high strength against axial loads (column strength).

本発明のボトル缶は、外径が公称２１１径（円筒状胴部の外径が６４．２４ｍｍ以上６８．２４ｍｍ以下）の円筒状胴部と、該円筒状胴部の上端から缶軸方向上側に向かうに従って縮径する縮径部と、該縮径部の上端に形成された口径３８ｍｍ（後述の膨出部の外径が３６．０ｍｍ以上４０．０ｍｍ以下）の口部とを備え、前記縮径部は、前記円筒状胴部の上端から凸状外面を形成する凸湾曲部と、該凸湾曲部の上端から前記口部の下端にかけて凹状外面を形成する凹湾曲部とを有しており、
前記凸湾曲部の外面の曲率半径が４５ｍｍ以上８０ｍｍ以下であり、前記凹湾曲部の外面の曲率半径が８５ｍｍ以上１１５ｍｍ以下である。 The bottle can of the present invention includes a cylindrical body portion having a nominal outer diameter of 211 mm (the outer diameter of the cylindrical body portion is 64.24 mm or more and 68.24 mm or less), and an axially upper side of the can from the upper end of the cylindrical body portion. a diameter-reducing portion whose diameter decreases as the diameter increases toward The reduced diameter portion has a convex curved portion forming a convex outer surface from the upper end of the cylindrical body, and a concave curved portion forming a concave outer surface from the upper end of the convex curved portion to the lower end of the mouth portion. Ori,
The radius of curvature of the outer surface of the convex curved portion is 45 mm or more and 80 mm or less, and the radius of curvature of the outer surface of the concave curved portion is 85 mm or more and 115 mm or less.

円筒状胴部と口部との間に、曲率半径の大きい凸湾曲部と凹湾曲部とを連結した縮径部を形成したので、滑らかでかつ柔らかい印象の外観を呈し、意匠性に優れている。また、縮径部が滑らかに形成されるので、飲料を口部から注ぎ出す際に、縮径部の内周面を飲料が滑らかに流れる。このため、脈動が生じにくい。特に、円筒胴部が長く、高さの大きい大容量のボトル缶において、良好な注ぎ性を有する。
また、ボトル缶の製造工程においては、倒立姿勢で搬送しながら内部を洗浄する工程があるが、その際の洗浄液の流出性も良好であり、内部に洗浄液が残りにくい。
さらに、径の大きい円筒状胴部と小径の口部との間で、曲率半径の大きい凸湾曲部と凹湾曲部とが連続して形成されているので、小径の口部の下端部を親指と人差し指とで握るように持つと、手の平の窪みに凹湾曲部から凸湾曲部の外面が倣うように接触するので、グリップ感にも優れている。このため、特に内容量の大きい大型缶に適用した場合に、持ったときの安定感に優れる。
また、高さの大きいボトル缶であっても、縮径部が凸湾曲部と凹湾曲部とにより滑らかに連続した形状であるので、軸荷重に対しても高い強度を有する。 Since a reduced diameter part is formed between the cylindrical body and the mouth part by connecting a convex curved part with a large radius of curvature and a concave curved part, it has a smooth and soft appearance and is excellent in design. There is. Furthermore, since the reduced diameter portion is formed smoothly, the beverage flows smoothly on the inner circumferential surface of the reduced diameter portion when pouring out the beverage from the spout. Therefore, pulsation is less likely to occur. In particular, it has good pourability in large capacity bottle cans with long cylindrical bodies and large heights.
In addition, in the process of manufacturing bottle cans, there is a step in which the inside is washed while being transported in an inverted position, and the flow of the cleaning liquid at that time is also good, and cleaning liquid does not easily remain inside.
Furthermore, since a convex curved part and a concave curved part with a large radius of curvature are continuously formed between the large-diameter cylindrical body and the small-diameter mouth, the lower end of the small-diameter mouth can be pressed with the thumb. When held between the index finger and the index finger, the outer surface of the concave curved section to the convex curved section comes into contact with the depression in the palm of the hand, giving it an excellent grip. Therefore, especially when applied to a large can with a large content, it provides excellent stability when held.
Further, even if the bottle is large in height, the reduced diameter portion has a smoothly continuous shape of the convex curved portion and the concave curved portion, so it has high strength against axial loads.

ボトル缶の一つの実施形態として、前記口部と前記縮径部との間に、前記口部より小径の首部が形成されるとともに、該首部の下端部に、前記縮径部の上端から外面が凸となる凸屈曲部が形成され、該凸屈曲部と前記凹湾曲部との接続部における前記凹湾曲部の接線は、缶軸に対する角度が２°以上１２°以下に形成されている。 In one embodiment of the bottle can, a neck portion having a smaller diameter than the mouth portion is formed between the mouth portion and the reduced diameter portion, and an outer surface is formed at the lower end of the neck portion from the upper end of the reduced diameter portion. A convex bent portion is formed, and a tangent to the concave curved portion at a connection portion between the convex bent portion and the concave curved portion is formed at an angle of 2° or more and 12° or less with respect to the can axis.

このボトル缶では、首部の凸屈曲部と縮径部の凹湾曲部との接続部は、凸屈曲部の曲率中心の缶軸方向位置よりも開口端側に配置される。このため、縮径部の高さ寸法を大きく確保することができ、その分、充填可能な内容量も増大し、大容量のボトル缶に有利である。 In this bottle can, the connection portion between the convex bent portion of the neck portion and the concave curved portion of the reduced diameter portion is arranged closer to the open end than the position of the center of curvature of the convex bent portion in the can axis direction. Therefore, it is possible to ensure a large height dimension of the diameter-reduced portion, and the fillable content increases accordingly, which is advantageous for large-capacity bottle cans.

本発明によれば、円筒状胴部と口部との間の縮径部分を滑らかでかつ柔らかい印象の外観とし、大容量であっても良好な注ぎ性を有する。 According to the present invention, the diameter-reduced portion between the cylindrical body and the mouth portion has a smooth and soft appearance, and has good pourability even in a large capacity.

本発明の一実施形態に係るボトル缶の半分を断面にした正面図である。FIG. 1 is a front view of a half-section of a bottle can according to an embodiment of the present invention. 図１のボトル缶の要部の拡大図である。FIG. 2 is an enlarged view of main parts of the bottle can in FIG. 1. FIG. ボトル缶の製造時の形状の変遷を（ａ）から（ｄ）の順に示す工程図である。It is a process diagram which shows the change of the shape at the time of manufacturing a bottle can in order from (a) to (d).

以下、本発明の実施形態について、図面を参照しながら説明する。 Embodiments of the present invention will be described below with reference to the drawings.

図１は、本発明の一実施形態に係るボトル缶の正面図である。このボトル缶１は、開口端部１ａにキャップ（図示省略）が装着されることにより、飲料等を収容する容器として用いられる。
ボトル缶１は、アルミニウム又はアルミニウム合金等の薄板金属からなり、図１に示すように、底部１１を有する円筒状胴部１２に、円筒状胴部１２の上端から缶軸方向上側に向かうに従って縮径する縮径部１３と、縮径部１３の上端に形成された口径３８ｍｍ（公称径であり、具体的には後述の膨出部１４１の外径が３６．０ｍｍ以上４０．０ｍｍ以下）の口部１４とを備えている。縮径部１３は、円筒状胴部１２の上端から凸状外面となる凸湾曲部１３１と、凸湾曲部１３１の上端から口部１４の下端にかけて凹状外面となる凹湾曲部１３２とを有している。
図１に示すように、円筒状胴部１２及び縮径部１３、口部１４は互いに同軸に配置されており、本実施形態において、これらの共通軸を缶軸Ｓと称して説明を行う。 FIG. 1 is a front view of a bottle can according to an embodiment of the present invention. The bottle can 1 is used as a container for storing beverages and the like by attaching a cap (not shown) to the open end 1a.
The bottle can 1 is made of a thin sheet metal such as aluminum or aluminum alloy, and as shown in FIG. diameter of the reduced diameter part 13 and a diameter of 38 mm formed at the upper end of the reduced diameter part 13 (the nominal diameter, specifically, the outer diameter of the bulged part 141 described below is 36.0 mm or more and 40.0 mm or less). The mouth part 14 is provided. The reduced diameter part 13 has a convex curved part 131 that becomes a convex outer surface from the upper end of the cylindrical body part 12 and a concave curved part 132 that becomes a concave outer surface from the upper end of the convex curved part 131 to the lower end of the mouth part 14. ing.
As shown in FIG. 1, the cylindrical body portion 12, the reduced diameter portion 13, and the mouth portion 14 are arranged coaxially with each other, and in this embodiment, the common axis thereof will be referred to as a can axis S for explanation.

円筒状胴部１２は、外径が公称２１１径（６４．２４ｍｍ以上６８．２４ｍｍ以下）であり、例えば６６．２ｍｍの外径に形成される。円筒状胴部１２の下端部には、ドーム状をなす底部１１が形成されており、底部１１は、缶軸Ｓ上に位置するとともに、上方（円筒状胴部１１の内部）に向けて膨出するように形成されたドーム部１１１と、ドーム部１１１の外周縁部と円筒状胴部１２の下端部とを接続するヒール部１１２とを備えている。また、ドーム部１１１とヒール部１１２との接続部分は、缶軸方向の下方に向けて凸となるように屈曲形成されており、ボトル缶１が正立姿勢（図１に示される、口部１４が上方を向く姿勢）となるように載置面上に載置されたときに、載置面に接する接地部１１３となっている。接地部１１３は、底部１１において最も下方に向けて突出しているとともに、周方向に沿って延びる環状をなしている。この接地部１１３の直径Ｄ２は例えば５６ｍｍに形成される。 The cylindrical body portion 12 has a nominal outer diameter of 211 mm (64.24 mm or more and 68.24 mm or less), and is formed to have an outer diameter of 66.2 mm, for example. A dome-shaped bottom 11 is formed at the lower end of the cylindrical body 12, and the bottom 11 is located on the can axis S and expands upward (into the cylindrical body 11). It includes a dome portion 111 formed to protrude, and a heel portion 112 connecting the outer peripheral edge of the dome portion 111 and the lower end of the cylindrical body portion 12. Further, the connecting portion between the dome portion 111 and the heel portion 112 is bent so as to be convex downward in the axial direction of the can, so that the bottle can 1 is in an upright position (as shown in FIG. 14 is a grounding portion 113 that comes into contact with the mounting surface when it is placed on the mounting surface so that it faces upward. The grounding portion 113 protrudes most downwardly in the bottom portion 11 and has an annular shape extending along the circumferential direction. The diameter D2 of this grounding portion 113 is, for example, 56 mm.

縮径部１３は、缶軸方向の下側に凸湾曲部１３１、上側に凹湾曲部１３２が形成され、これらが滑らかに接続されている。この場合、下側の凸湾曲部１３１の曲率半径Ｒ１より、上側の凹湾曲部１３２の曲率半径Ｒ２が大きく設定されている。具体的には、凸湾曲部１３１は、その外面の曲率半径Ｒ１が４５ｍｍ以上８０ｍｍ以下（７５ｍｍ以下が好ましい）に形成され、凹湾曲部１３２は、その外面の曲率半径Ｒ２が８５ｍｍ以上１１５ｍｍ以下に形成される。
また、縮径部１３と口部１４との間には、口部１４より小径の首部１５が形成されている。この首部１５は、その下端部に、縮径部１３の上端から半径方向外方に向けて凸となる比較的小さい曲率半径Ｒ３の凸屈曲部１５１が形成され、凸屈曲部１５１の上端に凹屈曲部１５２、凹屈曲部１５２の上端にわずかな幅の小径円筒部１５３が順次形成されている。このため、首部１５は、縮径部１３と口部１４との間でくびれた形状に形成される。凸屈曲部１５１の下端は縮径部１３の上側の凹湾曲部１３２の上端に滑らかに接続されている。 The reduced diameter portion 13 has a convex curved portion 131 on the lower side in the can axis direction and a concave curved portion 132 on the upper side, and these are smoothly connected. In this case, the radius of curvature R2 of the upper concave curved portion 132 is set larger than the radius of curvature R1 of the lower convex curved portion 131. Specifically, the convex curved portion 131 has an outer surface with a radius of curvature R1 of 45 mm or more and 80 mm or less (preferably 75 mm or less), and the concave curved portion 132 has an outer surface with a radius of curvature R2 of 85 mm or more and 115 mm or less. It is formed.
Further, a neck portion 15 having a smaller diameter than the mouth portion 14 is formed between the reduced diameter portion 13 and the mouth portion 14 . This neck portion 15 has a convex bent portion 151 having a relatively small radius of curvature R3 that is convex radially outward from the upper end of the reduced diameter portion 13 at its lower end, and has a concave portion at the upper end of the convex bent portion 151. A small diameter cylindrical portion 153 having a slight width is sequentially formed at the upper end of the bent portion 152 and the concave bent portion 152 . Therefore, the neck portion 15 is formed into a constricted shape between the reduced diameter portion 13 and the mouth portion 14. The lower end of the convex bent portion 151 is smoothly connected to the upper end of the concave curved portion 132 above the reduced diameter portion 13 .

本実施形態において、円筒状胴部１２と縮径部１３の下側の凸湾曲部１３１との接続位置から、縮径部１３の上側の凹湾曲部１３２と首部１５の下端部の凸屈曲部１５１との接続位置までの缶軸方向の長さＨ２は、４５ｍｍ以上７０ｍｍ以下に形成される。
また、凸屈曲部１５１の外面の曲率半径Ｒ３は２ｍｍ以上２５ｍｍ以下に形成される。そして、縮径部１３の凹湾曲部１３２と首部１５の凸屈曲部１５１との接続位置は、図２に示すように、凸屈曲部１５１の曲率半径Ｒ３の中心位置Ｃよりも缶軸方向の上方位置に配置されている。このため、凹湾曲部１３２と凸屈曲部１５１との接続部における凹湾曲部１３２の接線Ｔは、缶軸Ｓの上方に向かうにしたがって漸次缶軸Ｓに接近する方向に傾斜しており、缶軸Ｓに対する傾斜角度θが２°以上１２°以下に形成されている。したがって、首部１５の凸屈曲部１５１の缶軸方向長さが小さく形成され、その分、縮径部１３の缶軸方向長さＨ２が大きく形成される。この接線Ｔは、凹湾曲部１３２と凸屈曲部１５１との共通接線となる場合もある。 In this embodiment, from the connection position between the cylindrical body part 12 and the convex curved part 131 on the lower side of the reduced diameter part 13, the concave curved part 132 on the upper side of the reduced diameter part 13 and the convex bent part at the lower end of the neck part 15. The length H2 in the can axial direction up to the connection position with 151 is formed to be 45 mm or more and 70 mm or less.
Further, the radius of curvature R3 of the outer surface of the convex bent portion 151 is set to be greater than or equal to 2 mm and less than or equal to 25 mm. As shown in FIG. 2, the connection position between the concave curved portion 132 of the reduced diameter portion 13 and the convex curved portion 151 of the neck portion 15 is located further in the can axis direction than the center position C of the radius of curvature R3 of the convex curved portion 151. placed in the upper position. Therefore, the tangent line T of the concave curved part 132 at the connection part between the concave curved part 132 and the convex curved part 151 is inclined in a direction that gradually approaches the can axis S as it goes upward of the can axis S. The inclination angle θ with respect to the axis S is formed to be 2° or more and 12° or less. Therefore, the length of the convex bent portion 151 of the neck portion 15 in the can axial direction is formed to be small, and the length H2 of the reduced diameter portion 13 in the can axial direction is formed to be correspondingly large. This tangent T may be a common tangent between the concave curved portion 132 and the convex curved portion 151.

ところで、通常のボトル缶においては、前述した特許文献２記載のボトル缶のように、縮径部は円錐台面状に形成され、缶軸を通る縦断面ではストレートに形成される。また、この縮径部の缶軸方向の長さは、２１１径の円筒状胴部と３８ｍｍ口径の口部を有するボトル缶において、例えば２５ｍｍ程度に形成される。このため、円筒状胴部と縮径部との間は小さい曲率半径の屈曲部となってボトル缶の直径が急激に変化したように角ばった印象を与え、縮径部においてはボトル缶の外径が直線的に小さくなり、また、縮径部の上端は小さい直径で口部に接続される。 By the way, in a normal bottle can, like the bottle can described in Patent Document 2 mentioned above, the reduced diameter portion is formed in a truncated conical shape, and is formed straight in a longitudinal section passing through the can axis. Further, the length of the reduced diameter portion in the axial direction of the can is, for example, approximately 25 mm in a bottle can having a cylindrical body portion with a diameter of 211 mm and a mouth portion with a diameter of 38 mm. Therefore, there is a bend with a small radius of curvature between the cylindrical body and the reduced diameter part, giving an angular impression as if the diameter of the bottle has suddenly changed. The diameter decreases linearly, and the upper end of the reduced diameter section is connected to the mouth section with a small diameter.

これに対して、本実施形態のボトル缶１は、円筒状胴部１２の上端から下側の凸湾曲部１３１、上側の凹湾曲部１３２が滑らかに接続されて縮径部１３が形成されている。しかも、凸湾曲部１３１及び凹湾曲部１３２とも曲率半径Ｒ１，Ｒ２が従来のボトル缶より相当に大きく、このため、円筒状胴部１２から口部１４までの間でボトル缶１の直径が滑らかに変化する。また、円筒状胴部１２の上端から首部１５の凸屈曲部１５１の下端までの缶軸方向の長さＨ２、つまり縮径部１３の缶軸方向の長さＨ２が大きいので、曲率が急激に変化する部分がなく、曲率及び外径が缶軸方向の上方に向かうにしたがって全体に滑らかに変化している。 On the other hand, in the bottle can 1 of this embodiment, the convex curved part 131 on the lower side and the concave curved part 132 on the upper side are smoothly connected from the upper end of the cylindrical body 12 to form the reduced diameter part 13. There is. Furthermore, the radii of curvature R1 and R2 of both the convex curved portion 131 and the concave curved portion 132 are considerably larger than those of conventional bottle cans, so that the diameter of the bottle can 1 is smooth between the cylindrical body portion 12 and the mouth portion 14. Changes to Furthermore, since the length H2 in the can axial direction from the upper end of the cylindrical body 12 to the lower end of the convex bent portion 151 of the neck 15, that is, the length H2 in the can axial direction of the reduced diameter portion 13, is large, the curvature sharply increases. There is no changing part, and the curvature and outer diameter change smoothly as a whole as they move upward in the can axis direction.

また、縮径部１３の上側の凹湾曲部１３２とその上の首部１５の凸屈曲部１５１との接続位置が、凸屈曲部１５１の曲率中心Ｃの位置よりも缶軸方向上方位置に配置され、その接続部の共通接線Ｔが、缶軸Ｓの上方に向かうにしたがって漸次缶軸Ｓに接近する方向に傾斜しているので、凹湾曲部１３２の外面が首部１５の小径円筒部１５３に接近した位置まで連続し、凸屈曲部１５１の外面から凹湾曲部１３２の外面が缶軸方向下方に向かうにしたがって漸次拡径するように滑らかに連続している。 Further, the connection position between the concave curved portion 132 on the upper side of the reduced diameter portion 13 and the convex bent portion 151 of the neck portion 15 above it is arranged at a position higher in the can axis direction than the position of the center of curvature C of the convex bent portion 151. , the common tangent T of the connecting portion is inclined in a direction that gradually approaches the can axis S as it goes upward, so that the outer surface of the concave curved portion 132 approaches the small diameter cylindrical portion 153 of the neck portion 15. The outer surface of the convex bent portion 151 continues smoothly to the outer surface of the concave curved portion 132 so that the diameter thereof gradually increases downward in the axial direction of the can.

口部１４は、前述した首部１５の上に周方向に膨出部１４１が形成され、膨出部１４１の上に雄ねじ部１４２が形成され、雄ねじ部１４２の上方の開口端部１ａにカール部１４３が形成されている。そして、キャップ（図示略）が雄ねじ部１４２に螺合し、キャップの裾部が膨出部１４１に巻き込まれた状態で、キャップ内面のライナがカール部１４３に圧接して、内部を密封する。 The mouth portion 14 has a bulging portion 141 formed in the circumferential direction on the neck portion 15 described above, a male threaded portion 142 is formed on the bulging portion 141, and a curled portion at the open end 1a above the male threaded portion 142. 143 is formed. Then, a cap (not shown) is screwed onto the male threaded portion 142, and with the hem portion of the cap wrapped around the bulging portion 141, the liner on the inner surface of the cap comes into pressure contact with the curled portion 143 to seal the inside.

このボトル缶１を製造するには、図３に示すように、まず、アルミニウム合金等の薄板金属の板材を打ち抜いて絞り加工することにより、図３（ａ）に示す比較的大径で浅いカップ２１を成形した後、このカップ２１に再度の絞り加工及びしごき加工（ＤＩ加工）を加えて、図３（ｂ）に示すように所定高さの有底円筒状の筒体２２を成形し、その上端をトリミングにより切り揃える。このＤＩ加工により、筒体２２の底部は最終のボトル缶１としての底部１１の形状に成形される。 In order to manufacture the bottle can 1, as shown in FIG. 3, first, a sheet of thin metal such as aluminum alloy is punched out and drawn to create a relatively large diameter and shallow cup as shown in FIG. 3(a). After forming the cup 21, the cup 21 is subjected to drawing processing and ironing processing (DI processing) again to form a cylindrical body 22 with a bottom and a predetermined height as shown in FIG. 3(b). Trim the top edge. By this DI processing, the bottom of the cylinder 22 is formed into the shape of the bottom 11 of the final bottle can 1.

次いで、筒体３２の開口端部側を縮径加工（ネックイン加工）することにより、図３（ｃ）に示すように円筒胴部１２に連続する縮径部１３を形成するとともに、縮径部１３の上方で缶軸Ｏ方向に延びる小径の円筒部２３１を有する中間成形体２３を形成する。
この縮径加工（ネックイン加工）は、円筒状のネックイン金型を筒体２２の開口端側から缶軸方向に押し込んで、ネックイン金型の内周成形部によって筒体２２を縮径して、縮径部１３を形成する加工であるが、本実施形態のボトル缶１においては、縮径部１３が曲率半径の大きい凸湾曲部１３１と凹湾曲部１３２とが連続して形成された形状であり、かつ縮径部１３の長さＨ２が長いので、缶軸方向に対して比較的緩やかな傾斜に形成されている。このため、縮径加工が容易である。 Next, by reducing the diameter of the open end side of the cylinder 32 (neck-in processing), as shown in FIG. An intermediate molded body 23 having a small diameter cylindrical portion 231 extending in the direction of the can axis O above the portion 13 is formed.
In this diameter reduction process (neck-in process), a cylindrical neck-in mold is pushed in from the open end side of the cylinder body 22 in the direction of the can axis, and the cylinder body 22 is reduced in diameter by the inner peripheral molding part of the neck-in mold. In the bottle can 1 of this embodiment, the reduced diameter part 13 is formed by continuously forming a convex curved part 131 and a concave curved part 132 with a large radius of curvature. In addition, since the length H2 of the reduced diameter portion 13 is long, it is formed with a relatively gentle inclination with respect to the can axis direction. Therefore, diameter reduction processing is easy.

従来のボトル缶であると、縮径部を加工するのにネックイン金型の内周成形部の径を順次小さくしながら複数回の加工が必要であり、その複数回の加工によって縮径部が階段状に形成されるおそれがある。これを避けるためには、一回の加工面積を小さくして、加工回数を多くするか、縮径加工の最後に階段状部分を押しつぶして滑らかにするためのリフォーム加工をするなどの対策が必要である。
これに対して、本実施形態のボトル缶１の場合は、縮径部１３が滑らかな湾曲部１３１，１３２が連続して比較的緩やかな傾斜に形成されているので、ネックイン加工時の一回の加工面積を大きくすることができ、縮径部１３を滑らかに形成することができる。また、前述した凸湾曲部１３１及び凹湾曲部１３２の曲率半径Ｒ１，Ｒ２であるので、この縮径加工時に、プリーツ（細かい縦じわ）や成形痕（周方向に沿って形成される圧痕）の発生も防止される。従来のボトル缶においては、これらプリーツや成形痕の発生を防止しようとすると、その加工回数を増やす必要があり、生産性が低下する。 In the case of conventional bottle cans, in order to process the reduced diameter part, it is necessary to perform the process multiple times while successively reducing the diameter of the inner peripheral molded part of the neck-in mold. may be formed in a step-like manner. To avoid this, it is necessary to take measures such as reducing the area processed at one time and increasing the number of times the process is performed, or performing reform processing to crush and smooth the stepped part at the end of the diameter reduction process. It is.
On the other hand, in the case of the bottle can 1 of the present embodiment, the reduced diameter portion 13 is formed with smooth curved portions 131 and 132 that are continuous and have a relatively gentle slope. The machining area can be increased, and the reduced diameter portion 13 can be formed smoothly. In addition, since the curvature radii R1 and R2 of the convex curved portion 131 and the concave curved portion 132 described above are the same, during this diameter reduction process, pleats (fine vertical wrinkles) and molding marks (indentations formed along the circumferential direction) The occurrence of this is also prevented. In conventional bottle cans, in order to prevent the occurrence of these pleats and molding marks, it is necessary to increase the number of processing steps, which reduces productivity.

次いで、この円筒部２３１を再度拡径及び縮径することにより、図３（ｄ）に示すようにねじ加工する前の筒状部２４１を有する中間成形体２４を形成する。このとき、首部１５が形成される。そして、この筒状部２４１を加工して、膨出部１４１、雄ねじ部１４２、カール部１４３を形成することにより、図１に示すボトル缶１が形成される。 Next, by expanding and contracting the diameter of this cylindrical portion 231 again, an intermediate formed body 24 having a cylindrical portion 241 before threading is formed as shown in FIG. 3(d). At this time, the neck portion 15 is formed. Then, by processing this cylindrical portion 241 to form a bulging portion 141, a male threaded portion 142, and a curled portion 143, the bottle can 1 shown in FIG. 1 is formed.

なお、上述した縮径部以外の部分も含めて諸寸法について説明しておくと、ボトル缶１の接地部１４３の底面からカール部１４３の上面までの高さ（ボトル缶１の高さ）Ｈ０は１８０ｍｍ以上２３０ｍｍ以下、底部１１を含む円筒状胴部１２の高さＨ１は１００ｍｍ以上１５０ｍｍ以下である。内容量としては、４００ｍｌ以上６００ｍｌ以下の飲料缶として利用することができる。また、板厚は、プレス成形前の元板厚が０．３７０ｍｍ以上０．５５０ｍｍ以下であり、図５（ｂ）に示すＤＩ缶において、筒体２２の底部１１側の板厚（ウォール厚）ｔ１が０．１１０ｍｍ以上０．１５０ｍｍ以下に形成され、開口端部側の板厚（フランジ厚）ｔ２が０．２００ｍｍ以上０．２４０ｍｍ以下に形成される。この場合、ウォール厚ｔ１の部分２２１は、円筒状胴部１２の底部１１１よりも若干缶軸方向上方位置から、後の工程で縮径部１３の凸湾曲部１３１となる部分よりも若干缶軸方向下方位置までであり、フランジ厚ｔ２の部分２２２は、後の工程で縮径部１３の凸湾曲部１３１となる部分よりも缶軸方向上方部分である。なお、底部１１のドーム部１１１の板厚がほぼ元板厚、あるいは元板厚より若干薄くなる。 In addition, to explain various dimensions including parts other than the reduced diameter part mentioned above, the height from the bottom surface of the grounding part 143 of the bottle can 1 to the top surface of the curled part 143 (height of the bottle can 1) H0 is 180 mm or more and 230 mm or less, and the height H1 of the cylindrical body portion 12 including the bottom portion 11 is 100 mm or more and 150 mm or less. It can be used as a beverage can with a content capacity of 400 ml or more and 600 ml or less. In addition, the original plate thickness before press forming is 0.370 mm or more and 0.550 mm or less, and in the DI can shown in FIG. 5(b), the plate thickness on the bottom 11 side of the cylinder body 22 (wall thickness) t1 is formed to be 0.110 mm or more and 0.150 mm or less, and plate thickness (flange thickness) t2 on the open end side is formed to be 0.200 mm or more and 0.240 mm or less. In this case, the portion 221 with the wall thickness t1 is located at a position slightly above the bottom portion 111 of the cylindrical body portion 12 in the can axis direction and slightly more than the portion that will become the convex curved portion 131 of the reduced diameter portion 13 in a later step. The portion 222 having the flange thickness t2 is located above the portion that will become the convex curved portion 131 of the reduced diameter portion 13 in a later step in the can axial direction. Note that the thickness of the dome portion 111 of the bottom portion 11 is approximately the original thickness or slightly thinner than the original thickness.

このボトル缶１は、上記のような外観形状であるため、径の大きい円筒状胴部１２と小径の口部１４との間で、曲率半径の大きい凸湾曲部１３１と凹湾曲部１３２とが連続して形成されているので、円筒状胴部１２と口部１４との間が滑らかでかつ柔らかい印象の外観を呈し、意匠性に優れている。
また、縮径部１３が滑らかに形成されるので、飲料を口部１４から注ぎ出す際に、縮径部１３の内周面を飲料が滑らかに流れる。このため、脈動が生じにくい。特に、円筒状胴部１２が長く、高さの大きい大容量のボトル缶において、良好な注ぎ性を有する。
また、ボトル缶１の製造工程においては、倒立姿勢（開口端部１ａを缶軸方向下方に向けた姿勢）で搬送しながら内部を洗浄する工程があるが、その際の洗浄液の流出性も良好であり、内部に洗浄液が残りにくい。 Since this bottle can 1 has the external shape as described above, a convex curved part 131 and a concave curved part 132 with a large radius of curvature are formed between the cylindrical body part 12 with a large diameter and the mouth part 14 with a small diameter. Since it is formed continuously, the space between the cylindrical body part 12 and the mouth part 14 has a smooth and soft appearance, and is excellent in design.
Further, since the reduced diameter portion 13 is formed smoothly, the beverage flows smoothly on the inner circumferential surface of the reduced diameter portion 13 when pouring out the beverage from the spout 14. Therefore, pulsation is less likely to occur. Particularly, in a large-capacity bottle can with a long cylindrical body 12 and a large height, good pourability is achieved.
In addition, in the manufacturing process of the bottle can 1, there is a step in which the inside is washed while being transported in an inverted position (with the open end 1a facing downward in the can axis direction), and the cleaning liquid flows out easily at that time. This means that cleaning liquid is unlikely to remain inside.

さらに、小径の口部１４の下端部を親指と人差し指とで握るように持つと、手の平の窪みに凹湾曲部１３２から凸湾曲部１３１の外面が倣うように接触するので、グリップ感にも優れている。このため、特に内容量の大きい大型缶に適用した場合に、持ったときの安定感に優れる。
また、円筒状胴部１２から凸湾曲部１３１及び凹湾曲部１３２にかけて、外径が急激に変化する部分がなく、緩やかに変化しているので、ボトル缶１の外面の印刷面も円筒状胴部１２から縮径部１３にかけて広い範囲で確保することができ、意匠性に優れたボトル缶１を提供することができる。
また、このように、縮径部１３が凸湾曲部１３１と凹湾曲部１３２とを滑らかに連続させた形状であるので、キャッピング時等に作用する軸荷重に対しても高い強度を有し、変形が防止される。 Furthermore, when the lower end of the small-diameter opening 14 is grasped between the thumb and forefinger, the outer surface of the convex curved portion 131 from the concave curved portion 132 comes into contact with the depression of the palm of the hand, providing an excellent grip feeling. ing. Therefore, especially when applied to a large can with a large content, it provides excellent stability when held.
Moreover, since there is no part where the outer diameter changes suddenly from the cylindrical body 12 to the convex curved part 131 and the concave curved part 132, and the outer diameter changes gradually, the printed surface on the outer surface of the bottle can 1 also changes from the cylindrical body. A wide range from the portion 12 to the reduced diameter portion 13 can be secured, and the bottle can 1 with excellent design can be provided.
In addition, since the reduced diameter portion 13 has a shape in which the convex curved portion 131 and the concave curved portion 132 are smoothly connected, it has high strength against the axial load that is applied during capping, etc. Deformation is prevented.

なお、本発明は上記各実施形態の構成のものに限定されるものではなく、細部構成においては、本発明の趣旨を逸脱しない範囲において種々の変更を加えることが可能である。例えば、ボトル缶として、予め有底円筒状の筒体４１を形成して、その開口端部を成形したが、筒体は底部を有していないものも含むものとし、縮径部を成形した後に、筒体の胴部に、別に形成した底部を巻き締めるようにしてもよい。 Note that the present invention is not limited to the configurations of the above-described embodiments, and various changes can be made to the detailed configurations without departing from the spirit of the present invention. For example, as a bottle can, a cylindrical body 41 with a bottom is formed in advance and the open end thereof is molded. However, the cylinder body may also include one without a bottom, and after the reduced diameter part is molded. Alternatively, a separately formed bottom portion may be wrapped around the body of the cylinder.

プレス成形前の板厚が０．４６ｍｍのＪＩＳ３００４のアルミニウム材を用い、ウォール厚が０．１３０ｍｍ、フランジ厚が０．２２０ｍｍのＤＩ缶を成形した後、円筒状胴部の外径が６６．２４ｍｍ、口部の膨出部外径が３８．０ｍｍのボトル缶を成形した。このとき、円筒状胴部の高さＨ１、縮径部の高さＨ２、縮径部の凸湾曲部と凹湾曲部の曲率半径Ｒ１，Ｒ２を変えた複数のボトル缶を成形し、その成形性を評価するとともに、コラム強度を測定した。 Using JIS3004 aluminum material with a plate thickness of 0.46 mm before press forming, a DI can with a wall thickness of 0.130 mm and a flange thickness of 0.220 mm was formed, and the outer diameter of the cylindrical body was 66.24 mm. A bottle can having a mouth bulge having an outer diameter of 38.0 mm was molded. At this time, a plurality of bottle cans with different height H1 of the cylindrical body, height H2 of the reduced diameter part, and radius of curvature R1 and R2 of the convex curved part and concave curved part of the reduced diameter part are molded, and the molding In addition to evaluating the properties, column strength was also measured.

コラム強度は、ボトルの口金部上端（開口部）に平板を当接させ、島津製作所製の試験機（型番ＡＧ-５０ｋＮＧ）を用いて、５ｍｍ／ｍｉｎの速度で軸方向に圧縮して、座屈が開始された時の荷重を測定した。
成形性については、しわが缶の軸方向に延びて形成されるプリーツ（縦じわ）、縮径部に周方向に沿って形成される成形痕（圧痕）の有無を目視により観察して評価した。
その結果を表１に示す。 The column strength was measured by placing a flat plate in contact with the top end (opening) of the bottle mouthpiece and compressing it in the axial direction at a speed of 5 mm/min using a Shimadzu testing machine (model number AG-50kNG). The load at the beginning of flexion was measured.
Formability was evaluated by visually observing the presence or absence of pleats (vertical wrinkles) formed by wrinkles extending in the axial direction of the can, and molding marks (indentations) formed along the circumferential direction on the reduced diameter part. did.
The results are shown in Table 1.

表１により明らかなように、凸湾曲部の外面の曲率半径Ｒ１が４５ｍｍ以上８０ｍｍ以下で、凹湾曲部の外面の曲率半径Ｒ２が８５ｍｍ以上１１５ｍｍ以下である試料１～４は、コラム強度が１８００Ｎであり、プリーツや成形痕も認められず、成形性も良好であった。また、これら試料１～４において、凸屈曲部と凹湾曲部との接続部における凹湾曲部の接線の角度θを測定したところ、４°～６°の範囲であった。
これに対して、試料５は凸湾曲部の曲率半径Ｒ１、凹湾曲部の曲率半径Ｒ２のいずれも小さいため、コラム強度が低く、プリーツが認められた。試料６は凹湾曲部の曲率半径Ｒ２が大きいため、成形痕が認められた。試料７は凹湾曲部の曲率半径が小さいため、コラム強度が低く、プリーツが認められた。 As is clear from Table 1, samples 1 to 4, in which the radius of curvature R1 of the outer surface of the convex curved portion is 45 mm or more and 80 mm or less, and the radius of curvature R2 of the outer surface of the concave curved portion is 85 mm or more and 115 mm or less, have a column strength of 1800N. No pleats or molding marks were observed, and the moldability was good. In addition, in these samples 1 to 4, the angle θ of the tangent to the concave curved portion at the connection portion between the convex curved portion and the concave curved portion was measured and found to be in the range of 4° to 6°.
On the other hand, in sample 5, both the radius of curvature R1 of the convex curved part and the radius of curvature R2 of the concave curved part were small, so the column strength was low and pleats were observed. Since sample 6 had a large radius of curvature R2 of the concave curved portion, molding marks were observed. Sample 7 had a small radius of curvature of the concave curved portion, so the column strength was low and pleats were observed.

１ボトル缶
１１底部
１１１ドーム部
１１２ヒール部
１１３接地部
１２円筒状胴部
１３縮径部
１３１凸湾曲部
１３２凹湾曲部
１４口部
１４１膨出部
１４２雄ねじ部
１４３カール部
１５首部
１５１凸屈曲部
１５２凹屈曲部
１５３小径円筒部 1 Bottle can 11 Bottom part 111 Dome part 112 Heel part 113 Ground part 12 Cylindrical body part 13 Reduced diameter part 131 Convex curved part 132 Concave curved part 14 Mouth part 141 Swelling part 142 Male thread part 143 Curl part 15 Neck part 151 Convex curved part 152 Concave bent part 153 Small diameter cylindrical part

Claims

外径が公称２１１径の円筒状胴部と、該円筒状胴部の上端から缶軸方向上側に向かうに従って縮径する縮径部と、該縮径部の上端に接続された首部と、該首部の上に形成された口径３８ｍｍの口部と、を備え、前記縮径部は、前記円筒状胴部の上端から凸状外面を形成する凸湾曲部と、該凸湾曲部の上端から前記首部の下端にかけて凹状外面を形成する凹湾曲部とを有しており、
前記凸湾曲部の外面の曲率半径が４５ｍｍ以上８０ｍｍ以下であり、前記凹湾曲部の外面の曲率半径が８５ｍｍ以上１１５ｍｍ以下であり、
前記首部が前記口部より小径に形成され、
さらに前記首部は、前記凹湾曲部の上端から外面が凸となる凸屈曲部を有し、
前記円筒状胴部と前記凸湾曲部との接続位置から、前記凹湾曲部と前記凸屈曲部との接続位置までの缶軸方向の長さが４５ｍｍ以上７０ｍｍ以下であることを特徴とするボトル缶。 a cylindrical body with a nominal outer diameter of 211 mm; a reduced diameter part whose diameter decreases from the upper end of the cylindrical body toward the upper side in the axial direction of the can; a neck connected to the upper end of the reduced diameter part; a mouth portion with a diameter of 38 mm formed on the neck portion , and the reduced diameter portion includes a convex curved portion forming a convex outer surface from the upper end of the cylindrical body; It has a concave curved part forming a concave outer surface toward the lower end of the neck part ,
The radius of curvature of the outer surface of the convex curved portion is 45 mm or more and 80 mm or less, and the radius of curvature of the outer surface of the concave curved portion is 85 mm or more and 115 mm or less,
The neck portion is formed to have a smaller diameter than the mouth portion,
Furthermore, the neck portion has a convex bent portion whose outer surface is convex from the upper end of the concave curved portion,
The length in the can axis direction from the connecting position of the cylindrical body and the convex curved part to the connecting position of the concave curved part and the convex curved part is 45 mm or more and 70 mm or less. bottle can.

前記凸屈曲部と前記凹湾曲部との接続部における前記凹湾曲部の接線は、缶軸に対する角度が２°以上１２°以下に形成されていることを特徴とする請求項１記載のボトル缶。 The bottle can according to claim 1 , wherein a tangent to the concave curved portion at a connection portion between the convex curved portion and the concave curved portion is formed at an angle of 2° or more and 12° or less with respect to the can axis. .