JP2019011103A - Bottle can and bottle can with cap - Google Patents

Bottle can and bottle can with cap Download PDF

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JP2019011103A
JP2019011103A JP2017128966A JP2017128966A JP2019011103A JP 2019011103 A JP2019011103 A JP 2019011103A JP 2017128966 A JP2017128966 A JP 2017128966A JP 2017128966 A JP2017128966 A JP 2017128966A JP 2019011103 A JP2019011103 A JP 2019011103A
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bottle
cap
neck
axis
inclined portion
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JP7357430B2 (en
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鎌田　元彦
Motohiko Kamata
元彦 鎌田
長谷川　貴志
Takashi Hasegawa
貴志 長谷川
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Altemira Can Co Ltd
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Universal Can Corp
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Abstract

To provide a bottle can and a bottle can with a cap which can prevent a neck part from being deformed due to molding load during capping even when wall thinning of the can is intended.SOLUTION: A bottle can 10 is of cylindrical shape with a can body and a can bottom. A mouthpiece 5 of the can body is characterized by including a screw part 6, a bulging part 7 which is provided next to the lower part of the screw part 6, and bulges outward in the radial direction and extends all around the can axis and by which the lower end of the circumferential wall of a topped cylindrical cap 15 attached to the mouthpiece 5 is hem-wound, and an inclined part 21 which is provided next to the lower part of the bulging part 7, inclines radially inward while going downward, and is positioned outside an extended line L of the lower end of the bulging part 7 in a longitudinal sectional view including the can axis.SELECTED DRAWING: Figure 5

Description

本発明は、缶の薄肉化を図った場合であっても、キャッピング時の成形荷重による首部の変形を防止できるボトル缶、及びキャップ付きボトル缶に関する。   The present invention relates to a bottle can and a bottle can with a cap that can prevent deformation of a neck due to a forming load during capping even when the can is thinned.

従来、例えば下記特許文献１に示されるようなボトル缶が知られている。
ボトル缶は、アルミニウム合金材料等からなり、有底筒状に形成されている。ボトル缶は、缶の周壁である缶胴と、缶の底壁である缶底と、を備えている。缶胴の開口部は、該開口部以外の部位（胴部及び肩部）よりも小径の口金部とされている。 Conventionally, for example, a bottle can as shown in Patent Document 1 below is known.
The bottle can is made of an aluminum alloy material or the like, and is formed in a bottomed cylindrical shape. The bottle can includes a can body that is a peripheral wall of the can and a can bottom that is a bottom wall of the can. The opening part of the can body is a base part having a smaller diameter than parts (body part and shoulder part) other than the opening part.

図６及び図７に示すものは、従来のボトル缶１００の口金部１０１近傍の缶軸Ｏ方向に沿う縦断面図である。ボトル缶１００の口金部１０１は、ねじ部１０２と、ねじ部１０２の下方に隣接配置され、径方向外側へ向けて膨出するとともに缶軸Ｏ回りの全周にわたって延びる膨出部（カブラ）１０３と、膨出部１０３の下方に隣接配置され、該膨出部１０３よりも小径とされた円筒状の首部１０４と、を備える。
ボトル缶１００の内部に飲料等の内容物が充填された後、口金部１０１には有頂筒状のキャップ１０５が装着される。 6 and 7 are longitudinal sectional views along the direction of the can axis O in the vicinity of the cap 101 of the conventional bottle can 100. FIG. The base part 101 of the bottle can 100 is disposed adjacent to the screw part 102 and below the screw part 102, and bulges outwardly in the radial direction and extends over the entire circumference around the can axis O (cabra) 103. And a cylindrical neck portion 104 that is disposed adjacently below the bulging portion 103 and has a smaller diameter than the bulging portion 103.
After the inside of the bottle can 100 is filled with contents such as beverages, a cap 105 having a crest is attached to the base 101.

詳しくは、まず図６に示されるように、口金部１０１にキャップ１０５を被せ、該キャップ１０５の上方からプレッシャーブロック（図示略）により下方へと荷重（軸荷重）をかけ、ボトル缶１００を密封状態とする。この密封状態で、キャップ１０５の周壁に対して、ねじ巻きロール（図示略）を径方向内側へ向けて押し当てつつ缶軸Ｏ回りの周方向に転動させることにより、該キャップ１０５の周壁に、ねじ部１０２の雄ねじ形状に倣った雌ねじ形状を成形する。また、キャップ１０５の周壁下端に対して、裾巻きロール５０により径方向内側への荷重（横荷重）を付与しつつ、該裾巻きロール５０を缶軸Ｏ回りの全周に転動させて、キャップ１０５の周壁下端を裾巻き成形する。これにより、図７に示されるようにキャップ１０５の周壁下端が、膨出部１０３に密着して嵌合する。   Specifically, as shown in FIG. 6, first, a cap 105 is put on the base 101, and a load (axial load) is applied downward from above the cap 105 by a pressure block (not shown) to seal the bottle can 100. State. In this sealed state, by rolling a screw roll (not shown) against the peripheral wall of the cap 105 inward in the radial direction while rolling in the peripheral direction around the can axis O, Then, an internal thread shape that follows the external thread shape of the thread portion 102 is formed. Further, while applying a load (lateral load) radially inward to the lower end of the peripheral wall of the cap 105 by the skirt winding roll 50, the skirt winding roll 50 is rolled to the entire circumference around the can axis O, The bottom end of the peripheral wall of the cap 105 is skirt-wrapped. Thereby, as shown in FIG. 7, the lower end of the peripheral wall of the cap 105 is brought into close contact with the bulging portion 103.

特開２００４−２７６９９０号公報JP 2004-276990 A

従来のボトル缶は、下記の課題を有していた。
この種のボトル缶に対しては、原材料費の削減等を目的として、薄肉化への要請がある。しかしながら、単純に缶の薄肉化を図った場合、キャッピング時の成形荷重（軸荷重や横荷重）によって、缶軸に垂直な横断面視で首部が楕円形状等に変形するおそれがあった。 Conventional bottle cans have the following problems.
For this type of bottle can, there is a demand for thinning for the purpose of reducing raw material costs. However, when simply reducing the thickness of the can, the neck may be deformed into an elliptical shape or the like in a cross-sectional view perpendicular to the can axis due to a molding load (axial load or lateral load) during capping.

また図６及び図７において、裾巻きロール５０が、口金部１０１のうちキャップ１０５の周壁下端の下方に位置する首部１０４に対して強く押し当てられることにより、上記変形の起点となったり首部１０４が潰れることがあった。
具体的に、キャップ１０５の裾（周壁下端）は膨出部１０３の下端まで達しており、キャップ１０５の裾を確実に巻くには、キャッピング時に裾巻きロール５０の先端（外周）を首部１０４に強く押圧せざるを得ず、缶を薄肉化した場合には、首部１０４がこの押圧力（横荷重）に耐えられず変形するおそれがある。 6 and 7, the bottom winding roll 50 is strongly pressed against the neck portion 104 located below the lower end of the peripheral wall of the cap 105 in the base portion 101, thereby becoming the starting point of the deformation or the neck portion 104. Sometimes collapsed.
Specifically, the hem (lower end of the peripheral wall) of the cap 105 reaches the lower end of the bulging portion 103, and in order to wind the skirt of the cap 105 securely, the tip (outer periphery) of the hem winding roll 50 is attached to the neck 104 during capping. When the can must be pressed strongly and the can is thinned, the neck 104 may not withstand this pressing force (lateral load) and may be deformed.

本発明は、このような事情に鑑みてなされたものであって、缶の薄肉化を図った場合であっても、キャッピング時の成形荷重による首部の変形を防止できるボトル缶、及びキャップ付きボトル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 such circumstances, and even when the can is thinned, a bottle can that can prevent deformation of the neck due to a molding load during capping, and a bottle with a cap The purpose is to provide cans.

本発明の一態様は、缶胴と缶底とを備えた有底筒状のボトル缶であって、前記缶胴の口金部は、ねじ部と、前記ねじ部の下方に隣接配置され、径方向外側へ向けて膨出するとともに缶軸回りの全周にわたって延び、前記口金部に装着される有頂筒状のキャップの周壁下端が裾巻きされる膨出部と、前記膨出部の下方に隣接配置され、下方へ向かうに従い径方向内側へ向けて傾斜し、前記缶軸を含む縦断面視において、前記膨出部の下端の延長線よりも外側に位置する傾斜部と、を備えたことを特徴とする。
また、本発明の一態様は、缶胴と缶底とを備えた有底筒状のボトル缶と、前記缶胴の口金部に装着された有頂筒状のキャップと、を備えたキャップ付きボトル缶であって、前記口金部は、ねじ部と、前記ねじ部の下方に隣接配置され、径方向外側へ向けて膨出するとともに缶軸回りの全周にわたって延び、前記キャップの周壁下端が裾巻きされる膨出部と、前記キャップの周壁下端の下方に隣接配置され、下方へ向かうに従い径方向内側へ向けて傾斜し、前記缶軸を含む縦断面視において、前記膨出部の下端の延長線よりも外側に位置する傾斜部と、を備えたことを特徴とする。 One aspect of the present invention is a bottomed cylindrical bottle can having a can body and a can bottom, wherein the base portion of the can body is disposed adjacent to a screw portion and a lower portion of the screw portion, and has a diameter. A bulging portion that bulges outward in the direction and extends around the entire circumference of the can shaft, and is wound around the lower end of the peripheral wall of the cap-shaped cylindrical cap that is attached to the cap portion, and below the bulging portion And is inclined toward the inside in the radial direction as it goes downward, and in a longitudinal sectional view including the can shaft, the inclined portion is located outside the extension line of the lower end of the bulging portion. It is characterized by that.
One embodiment of the present invention is also provided with a cap including a bottomed cylindrical bottle can having a can body and a can bottom, and a top tubular cap attached to a base portion of the can body. In the bottle can, the cap portion is disposed adjacent to the screw portion and below the screw portion, bulges outward in the radial direction and extends over the entire circumference around the can axis, and the lower end of the peripheral wall of the cap is The bottom part of the bulge part is arranged adjacent to the bottom of the lower end of the peripheral wall of the cap and the bottom part of the cap, and is inclined inward in the radial direction as it goes downward. And an inclined portion located outside the extended line.

本発明のボトル缶及びキャップ付きボトル缶によれば、缶胴の口金部が傾斜部を有しており、該傾斜部は、膨出部の下方に隣接配置され、及び膨出部に嵌着されるキャップの周壁下端の下方に隣接配置されるとともに、下方へ向かうに従い径方向内側へ向けて傾斜して形成されている。つまり、従来のように膨出部の下方に、缶軸に平行な円筒状の首部が隣接配置されるのではなく、本発明では膨出部と首部との間に、下方へ向かうに従い徐々に径方向内側へ向けて延びるテーパー状の傾斜部が設けられている。
ボトル缶縦断面視において傾斜部は、膨出部の下端の延長線よりも外側（缶の外側であり、径方向外側と言い換えてもよい）に配置されている。そして、キャップの周壁下端を裾巻き成形する裾巻きロール（の先端）は、例えばこの傾斜部に対して、当接させられる。つまり裾巻きロールは、首部ではなく傾斜部に当接する。 According to the bottle can and the bottle can with the cap of the present invention, the cap portion of the can body has the inclined portion, and the inclined portion is disposed adjacent to the lower portion of the bulging portion and is fitted to the bulging portion. The cap is disposed adjacent to the lower end of the lower peripheral wall of the cap and is inclined toward the inside in the radial direction as it goes downward. That is, a cylindrical neck portion parallel to the can axis is not disposed adjacent to the lower portion of the bulge portion as in the prior art. In the present invention, the gradual portion gradually moves downward between the bulge portion and the neck portion. A tapered inclined portion extending inward in the radial direction is provided.
In the bottle can longitudinal cross-sectional view, the inclined portion is disposed outside the extended line at the lower end of the bulging portion (the outer side of the can and may be referred to as the radially outer side). And the skirt winding roll (front-end | tip) which skirt-forms the peripheral wall lower end of a cap is made to contact | abut with respect to this inclination part, for example. That is, the tail winding roll abuts on the inclined portion instead of the neck portion.

このため、キャッピング時に、裾巻きロールでキャップの周壁下端を膨出部に裾巻き成形する際、裾巻きロールは、キャップ周壁とともに傾斜部にも当接するが、この傾斜部が径方向内側に傾斜して逃げている分、該傾斜部に対する裾巻きロールからの押圧力（横荷重）を低減できる。
詳しくは、従来のように膨出部の下方に首部が隣接配置された構成に比べて、本発明では傾斜部が設けられた分だけ、該傾斜部を従来の首部よりも径方向内側に配置できる。裾巻きロールは、ばね力によって径方向内側へ向けて付勢されているため、裾巻きロールの先端（外周縁の鍔部）が、径方向内側へ逃げた傾斜部へと押し付けられることで、傾斜部が裾巻きロールから受ける押圧力を小さく抑えることができる。また、傾斜部が傾斜していることにより、裾巻きロールの押圧力を径方向内側以外の缶軸方向下方等に分散させることができる。また、傾斜部以外の部分（例えば傾斜部の下方に位置する首部等）に対して、裾巻きロールが当接することを防止することができる。従って、これらの相乗効果により、首部の変形を効果的に抑制できる。 For this reason, when capping the bottom end of the peripheral wall of the cap to the bulging portion with the skirt winding roll, the hem winding roll contacts the inclined portion together with the cap peripheral wall, but this inclined portion is inclined radially inward. As a result, the pressing force (lateral load) from the skirt winding roll against the inclined portion can be reduced.
Specifically, compared to the conventional configuration in which the neck portion is disposed adjacent to the lower portion of the bulge portion, the inclined portion is disposed on the inner side in the radial direction than the conventional neck portion in the present invention. it can. Since the skirt winding roll is biased radially inward by the spring force, the tip of the skirt winding roll (the edge of the outer peripheral edge) is pressed against the inclined portion escaping radially inward, The pressing force that the inclined portion receives from the skirt winding roll can be kept small. Further, since the inclined portion is inclined, it is possible to disperse the pressing force of the tail winding rolls in the lower direction of the can axis other than the radially inner side. Further, it is possible to prevent the tail roll from coming into contact with a portion other than the inclined portion (for example, a neck portion positioned below the inclined portion). Therefore, the neck deformation can be effectively suppressed by these synergistic effects.

ここで、裾巻きロールから首部が受ける径方向内側へ向けた押圧力と、これに応じた首部の変形量について説明する。首部の変形量（半径の変化量）△Ｒは、材料力学より下記の式で表すことができる。
△Ｒ＝（Ｒ２／ｔＥ）×Ｐ
上記式のうち、Ｐは外圧（裾巻きロールから首部が径方向内側へ向けて受ける圧力）、Ｒは首部の半径（内径）、ｔは首部の厚さ（肉厚）、Ｅはヤング率である。上記式より、外圧Ｐ、厚さｔ及びヤング率Ｅが一定の場合には、首部の変形量△Ｒは、首部の半径Ｒの二乗に比例することがわかる。つまり、首部の半径Ｒが小さくなれば、首部の変形量△Ｒも、半径Ｒの二乗に比例して小さくなる（なお、実際には半径Ｒが変化すると厚さｔも僅かに変化するが、微小量であるためここでは考慮しないこととする）。 Here, the pressing force applied to the inner side in the radial direction received by the neck from the tail winding roll and the deformation amount of the neck corresponding to the pressing force will be described. The neck deformation (radius change) ΔR can be expressed by the following equation from material mechanics.
ΔR = (R 2 / tE) × P
In the above formula, P is an external pressure (pressure that the neck receives from the skirt roll toward the inside in the radial direction), R is a radius (inner diameter) of the neck, t is a thickness (wall thickness) of the neck, and E is a Young's modulus. is there. From the above formula, it is understood that when the external pressure P, the thickness t, and the Young's modulus E are constant, the deformation amount ΔR of the neck is proportional to the square of the radius R of the neck. That is, when the radius R of the neck portion is reduced, the deformation amount ΔR of the neck portion is also reduced in proportion to the square of the radius R (in practice, the thickness t slightly changes as the radius R changes, Since it is a minute amount, it is not considered here).

本発明では、上述したように首部の上方に傾斜部が形成されている分、該首部の外径が小さくされている。つまり、従来のボトル缶に比べて本発明のボトル缶は、首部の半径Ｒが小さくされているため、仮に裾巻きロールから受ける押圧力が従来と同じであっても、首部の変形量△Ｒは確実に低減されて、首部の変形が防止される。   In the present invention, as described above, the outer diameter of the neck portion is reduced by the amount of the inclined portion formed above the neck portion. That is, the bottle can of the present invention has a neck radius R smaller than that of the conventional bottle can. Therefore, even if the pressing force received from the tail roll is the same as the conventional one, the neck deformation ΔR Is reliably reduced, and deformation of the neck is prevented.

以上より本発明のボトル缶及びキャップ付きボトル缶によれば、缶の薄肉化を図った場合であっても、キャッピング時の成形荷重（軸荷重や横荷重）によって首部が変形することを確実に防止できる。   As described above, according to the bottle can and the bottle can with the cap of the present invention, even when the can is thinned, it is ensured that the neck is deformed by the molding load (axial load or lateral load) at the time of capping. Can be prevented.

また、上記ボトル缶において、前記傾斜部の下方に配置されて前記傾斜部よりも小径とされた首部を備え、前記膨出部の最大外径と、前記首部の最小外径との差が、２．５〜１０．０ｍｍであることが好ましい。   Further, in the bottle can, comprising a neck portion disposed below the inclined portion and having a smaller diameter than the inclined portion, the difference between the maximum outer diameter of the bulging portion and the minimum outer diameter of the neck portion, It is preferable that it is 2.5-10.0 mm.

膨出部の最大外径（直径）と、首部の最小外径（直径）との差が、２．５ｍｍ以上であれば、膨出部と首部との間に位置する傾斜部の長さを十分に確保でき、裾巻きロールが首部に当たることをより確実に防止することができる。また、首部の半径Ｒが十分に小さくされて、首部の変形量△Ｒを安定して小さく抑えられる。
また上記差が、１０．０ｍｍ以下であれば、傾斜部の成形性が良好に維持される。つまり、例えばダイ加工によって傾斜部を成形する場合において、該傾斜部が首部から上方へ向けて急激に拡径させられることにより生じる割れ等を防止できる。
なお、上述の作用効果をさらに格別顕著なものとするには、上記差が３．０〜７．０ｍｍであることがより好ましい。 If the difference between the maximum outer diameter (diameter) of the bulging portion and the minimum outer diameter (diameter) of the neck portion is 2.5 mm or more, the length of the inclined portion positioned between the bulging portion and the neck portion is set. Sufficiently can be ensured, and the hem winding roll can be more reliably prevented from hitting the neck. In addition, the radius R of the neck is made sufficiently small, and the deformation amount ΔR of the neck can be stably kept small.
Moreover, if the said difference is 10.0 mm or less, the moldability of an inclination part will be maintained favorable. That is, for example, when the inclined portion is formed by die processing, it is possible to prevent cracks and the like caused by the diameter of the inclined portion being rapidly expanded from the neck portion upward.
In addition, in order to make the above-mentioned effect more remarkable, it is more preferable that the difference is 3.0 to 7.0 mm.

また、上記ボトル缶において、前記縦断面視で、前記缶軸に対して前記傾斜部が傾斜する角度が、２０〜４０°であることが好ましい。   Moreover, the said bottle can WHEREIN: It is preferable that the angle which the said inclination part inclines with respect to the said can axis | shaft is 20-40 degrees by the said longitudinal cross sectional view.

ボトル缶の缶軸を含む縦断面視で、缶軸に対して傾斜部が傾斜する角度が２０°以上であれば、傾斜部が十分に傾斜させられて（寝かされて）、該傾斜部に裾巻きロールが強く当たることをより確実に防止できる。
また上記縦断面視で、缶軸に対して傾斜部が傾斜する角度が４０°以下であれば、傾斜部が大きく傾斜させられ過ぎて（寝かされ過ぎて）、口金部の耐荷重（特に軸荷重への耐力）が低減するようなことを防止できる。 When the angle at which the inclined portion is inclined with respect to the can axis is 20 ° or more in a longitudinal sectional view including the can axis of the bottle can, the inclined portion is sufficiently inclined (laid down), and the inclined portion It is possible to more reliably prevent the hem winding roll from being strongly hit.
In addition, when the angle at which the inclined part is inclined with respect to the can axis is 40 ° or less in the longitudinal sectional view, the inclined part is excessively inclined (being laid down too much), and the load resistance of the base part (particularly, It is possible to prevent a reduction in the bearing load resistance).

また、上記ボトル缶において、前記縦断面視で、前記傾斜部が、直線状をなすこととしてもよい。
また、上記ボトル缶において、前記縦断面視で、前記傾斜部が、凹曲線状をなすこととしてもよい。 Moreover, the said bottle can WHEREIN: The said inclination part is good also as making linear form by the said longitudinal cross sectional view.
Moreover, the said bottle can WHEREIN: The said inclination part is good also as making a concave curve shape by the said longitudinal cross sectional view.

ボトル缶の縦断面視において、傾斜部は、直線状や凹曲線状に適宜形成されてよい。傾斜部が直線状に形成される場合には、該傾斜部を膨出部の下端に段差なく接続しやすくなり、傾斜部が凹曲線状に形成される場合には、成形性がより向上する。   In the longitudinal cross-sectional view of the bottle can, the inclined portion may be appropriately formed in a straight line shape or a concave curve shape. When the inclined portion is formed in a straight line, it becomes easy to connect the inclined portion to the lower end of the bulge portion without a step, and when the inclined portion is formed in a concave curve shape, the moldability is further improved. .

また、上記ボトル缶は、前記縦断面視で、前記膨出部と前記傾斜部とが、互いの接続部分において接するように繋がっていることが好ましい。   Moreover, it is preferable that the said bottle can is connected so that the said bulging part and the said inclination part may contact | connect in a mutual connection part by the said longitudinal cross sectional view.

この場合、口金部を成形しやすく、また、膨出部と傾斜部との接続部分を起点として口金部が座屈変形することを防止できる。また、口金部の外観（美観）がよい。   In this case, it is easy to mold the base part, and it is possible to prevent the base part from buckling and deforming from the connection part between the bulging part and the inclined part. In addition, the appearance (aesthetic appearance) of the base part is good.

また、上記キャップ付きボトル缶において、前記キャップの周壁下端から前記傾斜部の下端までの前記缶軸方向に沿う距離が、２〜６ｍｍであることが好ましい。   Moreover, the said bottle can with a cap WHEREIN: It is preferable that the distance along the said can axial direction from the surrounding wall lower end of the said cap to the lower end of the said inclination part is 2-6 mm.

キャップの周壁下端と、傾斜部の下端との缶軸方向の距離が、２ｍｍ以上であれば、裾巻きロールが首部に当たることをより確実に防止できる。これは、裾巻きロールの外周縁（鍔部）の上下方向の厚さが２ｍｍ以上であるためである。
また上記距離が、６ｍｍ以下であれば、傾斜部が長くなり過ぎることによる傾斜部の耐軸荷重の低減を抑制できる。 If the distance in the can axis direction between the lower end of the peripheral wall of the cap and the lower end of the inclined portion is 2 mm or more, the tail winding roll can be more reliably prevented from hitting the neck. This is because the thickness in the vertical direction of the outer peripheral edge (edge) of the skirt winding roll is 2 mm or more.
Moreover, if the said distance is 6 mm or less, the reduction | decrease of the axial load resistance of an inclination part by an inclination part becoming too long can be suppressed.

また、上記キャップ付きボトル缶において、前記傾斜部に、前記缶軸回りに延びる裾巻きロール痕が形成されたこととしてもよい。   Moreover, the said bottle can with a cap WHEREIN: The bottom winding roll trace extended around the said can axis | shaft may be formed in the said inclination part.

キャッピング時に裾巻きロールが傾斜部に当接することにより、該傾斜部には、缶軸回りに延びる裾巻きロール痕が形成される。本発明では上述したように、裾巻きロールによる傾斜部への押圧力を小さく抑えることができるため、裾巻きロール痕を目立たなくすることができる。そして首部の変形も抑制される。   When the skirt roll is brought into contact with the inclined portion at the time of capping, a skirt roll trace extending around the can axis is formed on the inclined portion. In the present invention, as described above, the pressing force applied to the inclined portion by the skirt winding roll can be kept small, so that the skirt winding trace can be made inconspicuous. And deformation of the neck is also suppressed.

また、上記キャップ付きボトル缶は、前記傾斜部の下方に配置されて前記傾斜部よりも小径とされた首部を備え、前記首部に、前記缶軸回りに延びる裾巻きロール痕が形成されていない。   Further, the bottle can with the cap includes a neck portion which is disposed below the inclined portion and has a smaller diameter than the inclined portion, and a skirt winding trace extending around the can axis is not formed on the neck portion. .

キャッピング時に裾巻きロールが首部に当接しないので、該首部には、缶軸回りに延びる裾巻きロール痕が形成されない。首部に裾巻きロール痕が形成されないため、口金部の美観を高めることができる。そして首部の変形がより確実に防止される。   Since the skirt roll does not contact the neck during capping, the skirt roll trace extending around the can axis is not formed on the neck. Since no skirt roll trace is formed on the neck, the beauty of the base can be enhanced. And the deformation | transformation of a neck part is prevented more reliably.

本発明のボトル缶及びキャップ付きボトル缶によれば、缶の薄肉化を図った場合であっても、キャッピング時の成形荷重による首部の変形を防止できる。   According to the bottle can and the bottle can with a cap of the present invention, deformation of the neck due to a molding load during capping can be prevented even when the can is thinned.

本発明の一実施形態に係るボトル缶及びキャップ付きボトル缶を示す縦断面図である。It is a longitudinal cross-sectional view which shows the bottle can and the bottle can with a cap which concern on one Embodiment of this invention. 本発明の一実施形態に係るボトル缶及びキャップ付きボトル缶の口金部近傍の縦断面図である。It is a longitudinal cross-sectional view of the nozzle | cap | die part vicinity of the bottle can and the bottle can with a cap concerning one Embodiment of this invention. 本発明の一実施形態に係るボトル缶及びキャップ付きボトル缶の口金部近傍の縦断面図である。It is a longitudinal cross-sectional view of the nozzle | cap | die part vicinity of the bottle can and the bottle can with a cap concerning one Embodiment of this invention. 本実施形態に係るキャップ付きボトル缶（ボトル缶）のキャップ裾巻き成形前の口金部近傍を拡大して示す縦断面図である。It is a longitudinal cross-sectional view which expands and shows the nozzle | cap | die part vicinity before cap skirt winding formation of the bottle can with a cap which concerns on this embodiment (bottle can). 本実施形態に係るキャップ付きボトル缶（ボトル缶）のキャップ裾巻き成形後の口金部近傍を拡大して示す縦断面図である。It is a longitudinal cross-sectional view which expands and shows the nozzle | cap | die part vicinity after the cap skirt winding formation of the bottle can with a cap which concerns on this embodiment (bottle can). 従来のボトル缶及びキャップ付きボトル缶の口金部近傍の縦断面図である。It is a longitudinal cross-sectional view of the mouthpiece part vicinity of the conventional bottle can and the bottle can with a cap. 従来のボトル缶及びキャップ付きボトル缶の口金部近傍の縦断面図である。It is a longitudinal cross-sectional view of the mouthpiece part vicinity of the conventional bottle can and the bottle can with a cap.

以下、本発明の一実施形態に係るボトル缶１０及びキャップ付きボトル缶２０について、図面を参照して説明する。なお、本実施形態の説明に用いる図面は、本発明の特徴をわかりやすくするために、要部となる部分を拡大、強調、抜粋して示している場合があり、各構成要素の寸法比率などが実際のものと同じであるとは限らない。   Hereinafter, a bottle can 10 and a bottle can 20 with a cap according to an embodiment of the present invention will be described with reference to the drawings. Note that the drawings used in the description of the present embodiment may show enlarged, emphasized, and excerpted portions that are essential parts in order to make the features of the present invention easier to understand. Is not always the same as the actual one.

ボトル缶１０は、アルミニウムを主成分とする例えば３００４材または３１０４材等の合金から形成されている。図１に示されるように、本実施形態ではボトル缶１０として、缶軸Ｏ方向に沿う全長（つまり缶全高）が１３３ｍｍ程度とされた、当業者が「３１０Ｂ」サイズと呼ぶボトル缶を一例に挙げている。ただしこれに限定されるものではなく、ボトル缶１０は、例えば缶全高が１６４ｍｍ程度とされた、当業者が「４１０Ｂ」サイズと呼ぶボトル缶等であってもよい。   The bottle can 10 is made of an alloy such as 3004 material or 3104 material mainly composed of aluminum. As shown in FIG. 1, in this embodiment, the bottle can 10 is an example of a bottle can called a “310B” size by a person skilled in the art whose total length along the can axis O direction (that is, the total height of the can) is about 133 mm. Cite. However, the present invention is not limited to this, and the bottle can 10 may be, for example, a bottle can called a “410B” size by a person skilled in the art whose total height is about 164 mm.

ボトル缶１０は、内部に飲料等の内容物が充填され、後述する缶胴１の口金部５にキャップ１５が取り付けられ密封されることにより、キャップ付きボトル缶２０とされる。つまり、キャップ付きボトル缶２０は、有底筒状をなすボトル缶１０と、該ボトル缶１０の口金部５に装着された有頂筒状のキャップ１５と、を有する。   The bottle can 10 is filled with contents such as a beverage, and a cap 15 is attached and sealed to a cap portion 5 of the can body 1 to be described later, thereby forming a bottle can 20 with a cap. In other words, the bottle can 20 with a cap includes a bottle can 10 having a bottomed cylindrical shape, and a cap-like cylindrical cap 15 attached to the base portion 5 of the bottle can 10.

ボトル缶１０は、缶の周壁である缶胴１と、缶の底壁である缶底２と、を備えている。缶胴１の中心軸、缶底２の中心軸及びキャップ１５の中心軸は、互いに同軸に配置されており、本実施形態ではこれらの共通軸を缶軸Ｏという。
また、缶軸Ｏが延在する方向（缶軸Ｏに沿う方向）を缶軸Ｏ方向という。缶軸Ｏ方向のうち、缶底２から缶胴１の口金部５及びキャップ１５へ向かう方向を上方といい、キャップ１５及び口金部５から缶底２へ向かう方向を下方という。
また、缶軸Ｏに直交する方向を径方向という。径方向のうち、缶軸Ｏに接近する向きを径方向の内側といい、缶軸Ｏから離間する向きを径方向の外側という。
また、缶軸Ｏ回りに周回する方向を周方向という。 The bottle can 10 includes a can body 1 that is a peripheral wall of the can and a can bottom 2 that is a bottom wall of the can. The central axis of the can body 1, the central axis of the can bottom 2, and the central axis of the cap 15 are arranged coaxially with each other. In the present embodiment, these common axes are referred to as a can axis O.
The direction in which the can axis O extends (the direction along the can axis O) is referred to as the can axis O direction. Of the can axis O direction, a direction from the can bottom 2 toward the base portion 5 and the cap 15 of the can body 1 is referred to as an upper direction, and a direction from the cap 15 and the base portion 5 toward the can bottom 2 is referred to as a downward direction.
A direction perpendicular to the can axis O is referred to as a radial direction. Of the radial directions, the direction approaching the can axis O is referred to as the inside in the radial direction, and the direction away from the can axis O is referred to as the outside in the radial direction.
Further, a direction around the can axis O is referred to as a circumferential direction.

本実施形態で用いる、ボトル缶１０の例えば「凹」、「凸」、「窪む」、「突出する」等の各種形状は、特に説明しない限り、ボトル缶１０の外面（缶外面。外部に露出する表面）における各種形状を表している。
また、図１〜図５に示されるボトル缶１０（キャップ付きボトル缶２０）の缶軸Ｏ方向に沿う縦断面視（缶軸Ｏを含む縦断面視）において、ボトル缶１０の各部形状の説明に用いる「円弧」、「曲線」、「直線」、「接線」、「延長線」等の線形状は、特に説明しない限り、ボトル缶１０の外面における各種の線形状を表している。 Various shapes such as “concave”, “convex”, “depressed”, “projecting” and the like of the bottle can 10 used in the present embodiment are the outer surface of the bottle can 10 (can outer surface. Various shapes on the exposed surface) are shown.
Moreover, in the longitudinal cross-sectional view (longitudinal cross-sectional view including the can axis | shaft O) along the can axis | shaft O direction of the bottle can 10 (bottle can 20 with a cap) shown by FIGS. 1-5 description of each part shape of the bottle can 10. FIG. Line shapes such as “arc”, “curve”, “straight line”, “tangent”, “extension line”, and the like used in FIG. 1 represent various line shapes on the outer surface of the bottle can 10 unless otherwise specified.

図１において、缶底２は、下方へ向けて突出するとともに周方向に沿って延びる環状凸部（リム）１１と、環状凸部１１の径方向の内側に連設され、上方へ向けて窪むドーム部１２と、を備えている。
また、缶胴１は、缶底２に接続する胴部３と、胴部３から上方へ向かうに従い径方向内側へ向けて傾斜する肩部４と、肩部４の上方に立設された口金部５と、を備えている。 In FIG. 1, a can bottom 2 protrudes downward and extends in the circumferential direction along an annular convex portion (rim) 11, and is continuously provided on the radially inner side of the annular convex portion 11, and is recessed upward. A dome portion 12.
In addition, the can body 1 includes a body portion 3 connected to the can bottom 2, a shoulder portion 4 inclined radially inward from the body portion 3, and a base erected above the shoulder portion 4. Part 5.

胴部３は、缶底２の環状凸部１１の外周縁部に連設されており、該外周縁部から上方に向けて延びている。胴部３は、缶軸Ｏ方向に沿って略一定の外径とされた円筒状をなしている。胴部３は、缶胴１における最大径部分であり、胴部３の外径は、例えば６５〜６７ｍｍである。
肩部４は、胴部３の上方に連設され、胴部３から上方へ向かうに従い徐々に縮径するテーパー状をなしている。 The trunk | drum 3 is provided in a row by the outer peripheral part of the cyclic | annular convex part 11 of the can bottom 2, and is extended toward upper direction from this outer peripheral part. The trunk | drum 3 has comprised the cylindrical shape made into the substantially constant outer diameter along the can axis | shaft O direction. The trunk | drum 3 is the largest diameter part in the can trunk | drum 1, and the outer diameter of the trunk | drum 3 is 65-67 mm, for example.
The shoulder portion 4 is provided continuously above the trunk portion 3 and has a tapered shape that gradually decreases in diameter from the trunk portion 3 toward the upper side.

図１〜図５において、口金部５は、肩部４の上方に連設されている。口金部５は、缶胴１の最小径部分とされている。
口金部５は、ねじ部６と、ねじ部６の下方に隣接配置され、径方向外側へ向けて膨出するとともに周方向の全周にわたって延びる膨出部７と、膨出部７の下方に隣接配置された傾斜部２１と、傾斜部２１の下方に配置されて該傾斜部２１よりも小径とされた首部８と、口金部５の上端開口縁に形成されたカール部９と、を備えている。なお本実施形態の例では、図４及び図５に示されるボトル缶縦断面視において、傾斜部２１と首部８との間に、これらを接続して凹曲線状をなす凹曲線部２２が形成されている。 In FIG. 1 to FIG. 5, the base portion 5 is provided continuously above the shoulder portion 4. The base portion 5 is a minimum diameter portion of the can body 1.
The cap portion 5 is disposed adjacent to the screw portion 6 and below the screw portion 6, bulges outward in the radial direction and extends over the entire circumference in the circumferential direction, and below the bulge portion 7. An inclined portion 21 disposed adjacently, a neck portion 8 disposed below the inclined portion 21 and having a smaller diameter than the inclined portion 21, and a curled portion 9 formed at the upper end opening edge of the base portion 5. ing. In the example of the present embodiment, in the bottle can vertical sectional view shown in FIGS. 4 and 5, a concave curve portion 22 is formed between the inclined portion 21 and the neck portion 8 so as to form a concave curve shape. Has been.

ねじ部６には、周方向へ向かうに従い缶軸Ｏ方向に向けて延びる螺旋状の雄ねじが形成されている。
膨出部７は、径方向外側へ向けて膨出するとともに周方向に沿って延びる環状をなしている。膨出部７は、カブラとも呼ばれる。膨出部７の外径は、ねじ部６の外径に対して同等以上の大きさであり、本実施形態の例では、ねじ部６の外径より大きい。膨出部７の最大外径（直径）は、例えば３８．０ｍｍ程度である。膨出部７の最大外径は、ボトル口径に相当する。つまり本実施形態のボトル缶１０は、３８ｍｍ口径である。 The screw portion 6 is formed with a helical male screw extending in the direction of the can axis O toward the circumferential direction.
The bulging portion 7 has an annular shape that bulges outward in the radial direction and extends along the circumferential direction. The bulging part 7 is also called a turnip. The outer diameter of the bulging portion 7 is equal to or larger than the outer diameter of the screw portion 6 and is larger than the outer diameter of the screw portion 6 in the example of the present embodiment. The maximum outer diameter (diameter) of the bulging portion 7 is, for example, about 38.0 mm. The maximum outer diameter of the bulging portion 7 corresponds to the bottle diameter. That is, the bottle can 10 of this embodiment has a 38 mm aperture.

図３及び図５に示すように、膨出部７には、口金部５に装着されるキャップ１５の周壁下端が裾巻きされる。口金部５にキャップ１５が取り付けられ、膨出部７の径方向外側に該キャップ１５の周壁が嵌合させられた状態で、膨出部７の下端と、キャップ１５の周壁下端とは、互いに略同一位置に（略一致して）配置される。   As shown in FIGS. 3 and 5, the lower end of the peripheral wall of the cap 15 attached to the base portion 5 is wound around the bulging portion 7. In a state where the cap 15 is attached to the base portion 5 and the peripheral wall of the cap 15 is fitted to the radially outer side of the bulge portion 7, the lower end of the bulge portion 7 and the lower end of the peripheral wall of the cap 15 are Arranged at substantially the same position (substantially coincident).

図４及び図５に示されるボトル缶縦断面視において、膨出部７は、ねじ部６の下方に隣接配置された上凸曲線部１６と、上凸曲線部１６の下方に隣接配置された中凸曲線部１７と、中凸曲線部１７の下方に隣接配置された下凸曲線部１８と、下凸曲線部１８の下方に隣接配置された直線部１９と、を有する。ボトル缶縦断面視において、上凸曲線部１６、中凸曲線部１７及び下凸曲線部１８は、いずれも径方向外側へ向けて凸となる曲線状をなしており、互いに曲率半径が異なっている。図示の例では、これらの凸曲線部の曲率半径が、下凸曲線部１８、上凸曲線部１６、中凸曲線部１７の順に大きくされている。   4 and 5, the bulging portion 7 is disposed adjacent to the upper convex curve portion 16 adjacent to the lower portion of the screw portion 6 and the upper convex curve portion 16. It has a middle convex curve portion 17, a lower convex curve portion 18 arranged adjacently below the middle convex curve portion 17, and a straight line portion 19 arranged adjacent below the lower convex curve portion 18. In the bottle can longitudinal sectional view, the upward convex curve portion 16, the middle convex curve portion 17, and the downward convex curve portion 18 are all curved in a radial outward direction, and have different radii of curvature. Yes. In the illustrated example, the radius of curvature of these convex curve portions is increased in the order of the downward convex curve portion 18, the upward convex curve portion 16, and the middle convex curve portion 17.

上凸曲線部１６は、ねじ部６の下端に連なり、下方へ向かうに従い径方向外側へ向けて傾斜している。中凸曲線部１７は、上凸曲線部１６の下端に接するように滑らかに連なり、下方へ向かうに従い径方向外側へ向けて傾斜している。中凸曲線部１７の缶軸Ｏ方向に沿う単位長さあたりの径方向への変位量（つまり傾き）は、上凸曲線部１６の前記変位量よりも小さい。   The upward convex curve portion 16 is connected to the lower end of the screw portion 6 and is inclined radially outward as it goes downward. The middle convex curve portion 17 is smoothly connected so as to be in contact with the lower end of the upward convex curve portion 16, and is inclined outward in the radial direction as it goes downward. A displacement amount (that is, inclination) in the radial direction per unit length along the can axis O direction of the middle convex curve portion 17 is smaller than the displacement amount of the upward convex curve portion 16.

下凸曲線部１８は、中凸曲線部１７の下端に接するように滑らかに連なり、下方へ向かうに従い径方向内側へ向けて傾斜している。図５に示されるボトル缶縦断面視で、下凸曲線部１８の（缶外面における）曲率半径ｒ２は、１．０〜１．６ｍｍである。直線部１９は、下凸曲線部１８の下端に接するように滑らかに連なり、下方へ向かうに従い径方向内側へ向けて傾斜している。ボトル缶縦断面視において、直線部１９は、直線状をなしている。
本実施形態では図５に示されるように、膨出部７の下凸曲線部１８及び直線部１９に対して、キャップ１５の周壁下端が裾巻きされる。 The downward convex curve portion 18 is smoothly connected so as to be in contact with the lower end of the middle convex curve portion 17, and is inclined radially inward as it goes downward. In the bottle can longitudinal cross-sectional view shown in FIG. 5, the curvature radius r <b> 2 (on the outer surface of the can) of the downward convex curve portion 18 is 1.0 to 1.6 mm. The straight line portion 19 is smoothly connected so as to be in contact with the lower end of the downward convex curve portion 18, and is inclined radially inward as it goes downward. In the bottle can longitudinal sectional view, the straight portion 19 has a straight shape.
In the present embodiment, as shown in FIG. 5, the lower end of the peripheral wall of the cap 15 is wound around the lower convex curve portion 18 and the straight portion 19 of the bulging portion 7.

また図５に示すボトル缶縦断面視で、膨出部７の下部（直線部１９）が缶軸Ｏに対して傾斜する角度は、３６〜５０°である。なお前記角度とは、ボトル缶縦断面視で、缶軸Ｏと膨出部７の下部との間に形成される鋭角及び鈍角のうち、鋭角の角度を指す。つまり、ボトル缶１０の縦断面視において、缶軸Ｏと膨出部７の下端の延長線Ｌとの間に形成される鋭角及び鈍角のうち、鋭角の角度が、３６〜５０°である。   Moreover, the angle which the lower part (straight part 19) of the bulging part 7 inclines with respect to the can axis | shaft O in the bottle can longitudinal cross-sectional view shown in FIG. The angle refers to an acute angle among an acute angle and an obtuse angle formed between the can axis O and the lower portion of the bulging portion 7 in a vertical view of the bottle can. That is, in the vertical cross-sectional view of the bottle can 10, the acute angle among the acute angle and the obtuse angle formed between the can axis O and the extension line L at the lower end of the bulging portion 7 is 36 to 50 °.

図２〜図５に示されるように、傾斜部２１は、下方へ向かうに従い径方向内側へ向けて傾斜しており、本実施形態の例では、キャップ１５の周壁下端とともに裾巻きロール５０に当接される。傾斜部２１は、膨出部７（の直線部１９）の下端に接続し、下方へ向かうに従い徐々に縮径するテーパー状をなしている。ボトル缶１０の縦断面視で、膨出部７（の下部）と傾斜部２１とは、互いの接続部分において接するように（共通の接線を有するように）、段差なく滑らかに繋がっている。   As shown in FIGS. 2 to 5, the inclined portion 21 is inclined radially inward as it goes downward. In the example of this embodiment, the inclined portion 21 contacts the bottom roll 50 together with the lower end of the peripheral wall of the cap 15. Touched. The inclined portion 21 is connected to the lower end of the bulging portion 7 (the straight portion 19 thereof) and has a tapered shape that gradually decreases in diameter as it goes downward. In the longitudinal cross-sectional view of the bottle can 10, the bulging portion 7 (lower portion) and the inclined portion 21 are smoothly connected without a step so as to be in contact with each other (so as to have a common tangent).

缶軸Ｏを含む縦断面視において、傾斜部２１は、膨出部７の下端の延長線Ｌよりも外側（缶の外側、径方向外側）に位置している。本実施形態では、膨出部７（の直線部１９）の下端とは、図５に示すように、キャップ１５の周壁の裾の先端が当接する位置７ａと定義する。   In the longitudinal sectional view including the can axis O, the inclined portion 21 is located outside the extended line L at the lower end of the bulging portion 7 (outside of the can, radially outside). In the present embodiment, the lower end of the bulging portion 7 (the straight portion 19 thereof) is defined as a position 7a where the tip of the skirt of the peripheral wall of the cap 15 abuts as shown in FIG.

図２〜図５に示す缶軸Ｏ方向に沿うボトル缶１０の縦断面視で、傾斜部２１は、缶軸Ｏに対して交差する向きに傾斜して延びる直線状をなしている。傾斜部２１の缶軸Ｏ方向に沿う単位長さあたりの径方向への変位量（つまり傾き）は、膨出部７の下部（直線部１９）の前記変位量よりも小さい。   In the longitudinal cross-sectional view of the bottle can 10 along the direction of the can axis O shown in FIGS. 2 to 5, the inclined portion 21 has a linear shape extending in an inclined manner in a direction intersecting the can axis O. The displacement amount (that is, the inclination) in the radial direction per unit length along the can axis O direction of the inclined portion 21 is smaller than the displacement amount at the lower portion (the straight portion 19) of the bulging portion 7.

図２及び図３に示すボトル缶１０の縦断面視において、缶軸Ｏに対して傾斜部２１が傾斜する角度θは、２０〜４０°である。図示の例では、角度θが３０°程度とされている。言い換えると、ボトル缶縦断面視において、缶軸Ｏに直交する仮想直線（図示略）に対して傾斜部２１が傾斜する角度（９０°−θ）が、６０°程度である。
なお、本実施形態でいう上記角度θとは、ボトル缶１０の縦断面視で、缶軸Ｏと傾斜部２１との間に形成される鋭角及び鈍角のうち、鋭角の角度を指す。
図３及び図５に示すボトル缶縦断面視で、缶軸Ｏに対して、膨出部７の下部（直線部１９）が傾斜する角度に比べて、傾斜部２１が傾斜する角度θが小さくされている。 2 and 3, the angle θ at which the inclined portion 21 is inclined with respect to the can axis O is 20 to 40 °. In the illustrated example, the angle θ is set to about 30 °. In other words, the angle (90 ° −θ) at which the inclined portion 21 is inclined with respect to a virtual straight line (not shown) orthogonal to the can axis O in the bottle can longitudinal sectional view is about 60 °.
In addition, the said angle (theta) as used in this embodiment points out an acute angle among the acute angles and obtuse angles formed between the can axis | shaft O and the inclination part 21 by the longitudinal cross-sectional view of the bottle can 10. As shown in FIG.
3 and FIG. 5, the angle θ at which the inclined portion 21 is inclined is smaller than the angle at which the lower portion (the straight portion 19) of the bulging portion 7 is inclined with respect to the can axis O. Has been.

図３及び図５に示されるキャップ付きボトル缶２０において、傾斜部２１は、キャップ１５の周壁下端の下方に隣接配置されており、該キャップ１５の周壁下端よりも斜め下方へ向けて延設されている。図５において、キャップ１５の周壁下端から傾斜部２１の下端までの缶軸Ｏ方向に沿う距離Ａは、２〜６ｍｍである。詳しくは、キャップ１５の周壁における板厚を含む最下端から、傾斜部２１のうち凹曲線部２２に接続する下端（傾斜部２１と凹曲線部２２との接続点）までの缶軸Ｏ方向の距離Ａが、２〜６ｍｍである。距離Ａは、後述する裾巻きロール５０の厚さ以上に設定されることが好ましい。つまり、裾巻きロール５０の外周縁（鍔部）の上下方向の厚さ（ロール先端上下幅）が、少なくとも２ｍｍである。また、膨出部７（の直線部１９）の下端から傾斜部２１の下端まで（凹曲線部２２の上端まで）の缶軸Ｏ方向の距離については、キャップ１５の周壁下端の板厚を考慮して、２．２〜６．２ｍｍである。   In the bottled can 20 with the cap shown in FIGS. 3 and 5, the inclined portion 21 is disposed adjacent to the lower end of the peripheral wall of the cap 15 and extends obliquely downward from the lower end of the peripheral wall of the cap 15. ing. In FIG. 5, the distance A along the can axis O direction from the lower end of the peripheral wall of the cap 15 to the lower end of the inclined portion 21 is 2 to 6 mm. Specifically, in the direction of the can axis O from the lowermost end including the thickness of the peripheral wall of the cap 15 to the lower end (the connection point between the inclined portion 21 and the concave curved portion 22) of the inclined portion 21 connected to the concave curved portion 22. The distance A is 2 to 6 mm. The distance A is preferably set to be equal to or greater than the thickness of the tail winding roll 50 described later. That is, the vertical thickness (roll tip vertical width) of the outer peripheral edge (edge) of the skirt roll 50 is at least 2 mm. Further, regarding the distance in the can axis O direction from the lower end of the bulging portion 7 (the straight portion 19 thereof) to the lower end of the inclined portion 21 (up to the upper end of the concave curve portion 22), the thickness of the lower end of the peripheral wall of the cap 15 is taken into consideration. Then, it is 2.2 to 6.2 mm.

凹曲線部２２は、傾斜部２１の下方に連なっており、径方向内側へ向けて窪む凹曲面状をなしている。凹曲線部２２は、傾斜部２１と首部８とに滑らかに接続している。図５に示されるボトル缶縦断面視で、凹曲線部２２の曲率半径ｒ１は、０．８〜１．４ｍｍである。   The concave curve portion 22 continues below the inclined portion 21 and has a concave curved surface shape that is recessed toward the inside in the radial direction. The concave curve portion 22 is smoothly connected to the inclined portion 21 and the neck portion 8. In the bottle can vertical sectional view shown in FIG. 5, the radius of curvature r1 of the concave curve portion 22 is 0.8 to 1.4 mm.

首部８は、凹曲線部２２の下方に連なっており、膨出部７と肩部４との間において最も小径に形成された部分である。図４及び図５に示される例では、首部８が、缶軸Ｏに平行に延びる円筒状をなしている。例えばこれに代えて、首部８が径方向内側へ向けて窪む凹曲面状をなしていてもよい。   The neck portion 8 is connected to the lower side of the concave curve portion 22, and is the portion formed with the smallest diameter between the bulging portion 7 and the shoulder portion 4. In the example shown in FIGS. 4 and 5, the neck portion 8 has a cylindrical shape extending parallel to the can axis O. For example, instead of this, the neck portion 8 may have a concave curved surface shape that is recessed inward in the radial direction.

首部８の最小外径（直径）は、２８〜３５．５ｍｍである。本実施形態の例では、首部８の最小外径が３２ｍｍ程度とされている。また、膨出部７の最大外径（直径）と、首部８の最小外径（直径）との差は、２．５〜１０．０ｍｍである。好ましくは、上記差は３．０〜７．０ｍｍである。
首部８の厚さ（肉厚。板厚）は、例えば、０．２５０〜０．３３５ｍｍである。 The minimum outer diameter (diameter) of the neck 8 is 28 to 35.5 mm. In the example of this embodiment, the minimum outer diameter of the neck 8 is about 32 mm. Further, the difference between the maximum outer diameter (diameter) of the bulging portion 7 and the minimum outer diameter (diameter) of the neck portion 8 is 2.5 to 10.0 mm. Preferably, the difference is 3.0 to 7.0 mm.
The thickness (thickness, plate thickness) of the neck 8 is, for example, 0.250 to 0.335 mm.

本実施形態の例では、首部８の下方に凹曲線部が連なっており、該凹曲線部の下方に肩部４の上端部が接続している。なお、首部８と肩部４との間に、缶の座屈強度を高める目的で段部（図示略）を設けてもよい。   In the example of the present embodiment, a concave curve portion is continued below the neck portion 8, and the upper end portion of the shoulder portion 4 is connected to the lower portion of the concave curve portion. A step portion (not shown) may be provided between the neck portion 8 and the shoulder portion 4 for the purpose of increasing the buckling strength of the can.

カール部９は、口金部５の上端開口縁に位置している。カール部９の先端（材料端）は、径方向外側から下方へ向けて折り返されている。カール部９は、周方向に沿って延びる環状をなしている。本実施形態では、カール部９及び首部８のいずれかが、口金部５における最小径部分とされている。図示の例では、カール部９の外周の全周にわたって、径方向内側へ向けたスロットル加工（カール潰し加工）が施されており、これによりカール部９の外周面は、缶軸Ｏに平行な円筒面状をなしている。   The curled portion 9 is located at the upper end opening edge of the base portion 5. The tip (material end) of the curled portion 9 is folded back from the outside in the radial direction. The curled portion 9 has an annular shape extending along the circumferential direction. In the present embodiment, either the curl portion 9 or the neck portion 8 is the minimum diameter portion in the base portion 5. In the illustrated example, throttle processing (curling crushing processing) directed radially inward is performed over the entire outer periphery of the curled portion 9, whereby the outer peripheral surface of the curled portion 9 is parallel to the can axis O. It has a cylindrical surface.

次に、本実施形態のボトル缶１０及びキャップ付きボトル缶２０の製造方法について、製造工程の一例を説明する。
ボトル缶１０は、板材打ち抜き工程、カッピング工程（絞り工程）、ＤＩ工程（絞りしごき工程）、トリミング工程、印刷・塗装（缶外面）工程、塗装（缶内面）工程、ネッキング工程、トリミング工程、ねじ成形工程、カール工程及びスロットル工程等を経て、製缶される。 Next, an example of a manufacturing process is demonstrated about the manufacturing method of the bottle can 10 and the bottle can 20 with a cap of this embodiment.
The bottle can 10 includes a sheet material punching process, a cupping process (drawing process), a DI process (drawing and ironing process), a trimming process, a printing / painting (can outer surface) process, a painting (can inner surface) process, a necking process, a trimming process, and a screw. Cans are made through a molding process, a curling process, a throttle process, and the like.

板材打ち抜き工程では、アルミニウム合金材料等からなる圧延材（板材）を打ち抜き加工して、円板状のブランクを成形する。
カッピング工程（絞り工程）では、ブランクをカッピングプレスにより絞り加工（カッピング加工）して、有底筒状のカップ状体に成形する。 In the plate material punching step, a rolled material (plate material) made of an aluminum alloy material or the like is punched to form a disk-shaped blank.
In the cupping step (drawing step), the blank is drawn (capping) by a cupping press to form a bottomed cylindrical cup-shaped body.

ＤＩ工程（絞りしごき工程）では、ＤＩ缶製造装置によってカップ状体に再絞り及びしごき加工を施して、缶胴と缶底とを備えた有底筒状のＤＩ缶を成形する。なお「ＤＩ」とは、Ｄｒａｗｉｎｇ＆Ｉｒｏｎｉｎｇの略称である。
またＤＩ工程において、缶底には、上述した環状凸部１１及びドーム部１２がプレス成形される。 In the DI process (squeezing and ironing process), the cup-shaped body is redrawn and ironed by a DI can manufacturing apparatus to form a bottomed cylindrical DI can having a can body and a can bottom. “DI” is an abbreviation for “Drawing & Ironing”.
Further, in the DI process, the annular convex portion 11 and the dome portion 12 described above are press-molded on the can bottom.

ＤＩ工程を経たＤＩ缶は、缶胴の開口端部が凹凸形状をなしており、いわゆる耳が形成されていて高さが不均一である。このためトリミング装置を用いて、缶胴の開口端部のトリミング加工を行い、該開口端部の高さが全周にわたって均等に揃えられたＤＩ缶とする（トリミング工程）。   In the DI can that has undergone the DI process, the opening end of the can body has an uneven shape, so-called ears are formed, and the height is uneven. For this reason, a trimming device is used to trim the opening end of the can body to obtain a DI can in which the height of the opening end is evenly aligned over the entire circumference (trimming step).

次いで、ＤＩ缶を洗浄して油分等を除去した後に、表面処理を施して乾燥し、ＤＩ缶の外面の印刷及び塗装を行い（印刷・塗装（缶外面）工程）、ＤＩ缶の内面の塗装を行う（塗装（缶内面）工程）。
ＤＩ缶の缶外面には、印刷及び外面仕上げニスの塗装が行われる。印刷、外面仕上げ塗装はウエットオンウエットで塗装され、その後焼付・乾燥される。
また、外面塗装後は、内面塗装とその乾燥・焼付が行われる。ＤＩ缶の内面への塗装は、スプレーノズルによって缶胴の開口部から缶底へ向けて塗料を噴霧して行われる。噴霧した塗料を乾燥することにより缶内面に塗膜が形成されて、耐食性が付与される。 Next, the DI can is washed to remove oil, etc., then surface-treated and dried, and the outer surface of the DI can is printed and painted (printing / painting (can outer surface) process), and the inner surface of the DI can is painted. (Painting (inner surface) process).
The outer surface of the DI can is printed and painted with an outer finish varnish. Printing and exterior finishing are applied wet-on-wet, then baked and dried.
In addition, after the outer surface coating, the inner surface coating and its drying / baking are performed. The inner surface of the DI can is applied by spraying paint from the opening of the can body to the bottom of the can with a spray nozzle. By drying the sprayed paint, a coating film is formed on the inner surface of the can, and corrosion resistance is imparted.

このＤＩ缶を、ボトル缶製造装置に移送する。ボトル缶製造装置では、複数種類のダイ加工ツール（ネッキング成形金型）を用いて、缶胴の開口部近傍に段階的にダイ加工（ネッキング加工）を施すことにより、肩部４及び口金部５を成形する（ネッキング工程）。
具体的に、肩部４及び首部８については、ダイ加工により缶胴の開口部近傍を段階的に縮径して成形する。凹曲線部２２、傾斜部２１及び膨出部７の下部（直線部１９及び下凸曲線部１８等）については、ダイ加工により缶胴の開口部近傍を段階的に拡径して成形する。
また必要に応じて、複数種類のダイ加工同士の間に、トリミング加工ツールを用いて、高さが不揃いとなった開口端部のトリミング加工を行う（トリミング工程）。 This DI can is transferred to a bottle can manufacturing apparatus. In the bottle can manufacturing apparatus, by using a plurality of types of die processing tools (necking molds), die processing (necking processing) is performed stepwise in the vicinity of the opening of the can body, so that the shoulder 4 and the base 5 Is molded (necking step).
Specifically, the shoulder portion 4 and the neck portion 8 are molded by gradually reducing the diameter of the vicinity of the opening of the can body by die processing. About the concave curve part 22, the inclined part 21, and the lower part of the bulging part 7 (the linear part 19 and the downward convex curve part 18 etc.), the diameter vicinity of the opening part of a can body is expanded gradually and formed by die processing.
Further, if necessary, a trimming process is performed between the plurality of types of die processing using the trimming processing tool on the opening end portion where the heights are not uniform (trimming step).

次いで、缶胴１の口金部５に、ねじ成形加工ツールを用いてねじ成形加工を施す（ねじ成形工程）。また口金部５の上端開口に、カール加工ツールを用いてカール加工を施し（カール工程）、スロットル加工ツール（カール潰し加工ツール）を用いてスロットル加工（スロットル工程）を施す。これにより、口金部５にねじ部６及びカール部９が成形される。なお、上述のねじ成形加工とカール加工との間に、複数のダイ加工及びトリミング加工を行ってもよい。   Next, the cap part 5 of the can body 1 is subjected to screw forming using a screw forming tool (screw forming process). Further, the upper end opening of the base part 5 is subjected to curling processing using a curling tool (curling process), and throttle processing (throttle processing) using a throttle processing tool (curling crushing processing tool). Thereby, the screw part 6 and the curl part 9 are formed in the base part 5. A plurality of die processing and trimming processing may be performed between the above-described screw forming processing and curling processing.

これにより、図１に示されるような繋ぎ目のない一体成型されたボトル缶１０が製缶される。
なお、本実施形態の例では、口金部５の首部８、凹曲線部２２及び傾斜部２１等の成形を、上記ネッキング工程においてダイ加工ツールを用いて行うこととした。これに代えて、ねじ成形工程の前後において回転加工ツール（中子ローラ、外子ローラ等の成形ローラ）を用いて行ってもよい。 Thereby, the integrally formed bottle can 10 as shown in FIG. 1 is manufactured.
In the example of the present embodiment, the neck portion 8, the concave curve portion 22, the inclined portion 21, and the like of the base portion 5 are formed using a die processing tool in the necking step. Instead of this, rotation processing tools (forming rollers such as a core roller and an outer roller) may be used before and after the screw forming step.

上記スロットル工程よりも後工程において、ボトル缶１０の内部には飲料等の内容物が充填され、キャッパー（キャップ装着装置）により、口金部５には、有頂筒状をなすキャップ１５が嵌着される。これにより、キャップ付きボトル缶２０が製造される。
詳しくは、まず図２及び図４に示されるように、口金部５にキャップ１５を被せ、該キャップ１５の上方からプレッシャーブロック（図示略）により下方へと荷重（軸荷重）をかけ、キャップ１５の頂壁（天壁）の下面に設けたシール材を口金部５のカール部９に上方から押し付けて、ボトル缶１０を密封状態とする。この密封状態で、キャップ１５の周壁に対して、ねじ巻きロール（図示略）を径方向内側へ向けて押し当てつつ缶軸Ｏ回りの周方向に転動させることにより、該キャップ１５の周壁に、ねじ部６の雄ねじ形状に倣った雌ねじ形状を成形する。また、キャップ１５の周壁下端に対して、裾巻きロール５０により径方向内側への荷重（横荷重）を付与しつつ、該裾巻きロール５０を缶軸Ｏ回りの全周に転動させて、キャップ１５の周壁下端を裾巻き成形する。これにより、図３及び図５に示されるようにキャップ１５の周壁下端が、膨出部７（の下部）に密着して嵌合する。
このようにして、ボトル缶１０の内容物が密封された状態で、口金部５にキャップ１５が取り付けられる。またこの密封状態は、口金部５からキャップ１５を取り外し開栓するまでの間、維持される。 In a step after the throttle step, the inside of the bottle can 10 is filled with contents such as beverages, and a cap 15 having a top tube shape is fitted into the base portion 5 by a capper (cap mounting device). Is done. Thereby, the bottle can 20 with a cap is manufactured.
Specifically, as shown in FIGS. 2 and 4, first, a cap 15 is put on the cap portion 5, and a load (axial load) is applied downward from above the cap 15 by a pressure block (not shown). A sealing material provided on the lower surface of the top wall (top wall) is pressed against the curled part 9 of the base part 5 from above to make the bottle can 10 sealed. In this sealed state, by rolling a screw roll (not shown) against the peripheral wall of the cap 15 inward in the radial direction while rolling in the peripheral direction around the can axis O, Then, an internal thread shape that follows the external thread shape of the thread portion 6 is formed. Further, while applying a load (lateral load) radially inward by the skirt winding roll 50 to the lower end of the peripheral wall of the cap 15, the skirt winding roll 50 is rolled to the entire circumference around the can axis O, The bottom end of the peripheral wall of the cap 15 is formed by skirt winding. As a result, as shown in FIGS. 3 and 5, the lower end of the peripheral wall of the cap 15 is brought into close contact with the bulging portion 7 (the lower portion thereof).
In this manner, the cap 15 is attached to the base portion 5 with the contents of the bottle can 10 sealed. Further, this sealed state is maintained until the cap 15 is removed from the cap 5 and opened.

なお本実施形態の例では、裾巻きロール５０によってキャップ１５の周壁下端を裾巻き成形する際、図３に示すように、裾巻きロール５０の先端（外周の鍔部）が傾斜部２１に当接させられる。裾巻きロール５０が傾斜部２１に当接されることにより、傾斜部２１には、缶軸Ｏ回りに延びる裾巻きロール痕（図示略）が形成される。また、裾巻きロール５０は首部８に対しては当接させられず、このため首部８には、上記裾巻きロール痕は形成されない。
つまり本実施形態の例では、裾巻きロール５０でキャップ１５の周壁下端を裾巻き成形するときに、該裾巻きロール５０の先端を積極的に傾斜部２１に当てることで、この裾巻きロール５０の先端が首部８に当たることを防止している。 In the example of the present embodiment, when the bottom end of the peripheral wall of the cap 15 is formed by skirt winding 50 with the skirt winding roll 50, as shown in FIG. Touched. When the skirt winding roll 50 is brought into contact with the inclined portion 21, a skirt winding trace (not shown) extending around the can axis O is formed on the inclined portion 21. Further, the skirt winding roll 50 is not brought into contact with the neck portion 8, and thus the skirt winding roll mark is not formed on the neck portion 8.
That is, in the example of the present embodiment, when the bottom end of the peripheral wall of the cap 15 is skirt-rolled by the skirt winding roll 50, the tip of the skirt winding roll 50 is positively applied to the inclined portion 21, so that the skirt winding roll 50 Is prevented from hitting the neck 8.

以上説明した本実施形態に係るボトル缶１０及びキャップ付きボトル缶２０によれば、缶胴１の口金部５が傾斜部２１を有しており、該傾斜部２１は、膨出部７の下方に隣接配置され、及び膨出部７に嵌着されるキャップ１５の周壁下端の下方に隣接配置されるとともに、下方へ向かうに従い径方向内側へ向けて傾斜して形成されている。つまり、図７に示す従来のボトル缶１００のように、膨出部１０３の下方に、缶軸Ｏに平行な円筒状の首部１０４が隣接配置されるのではなく、本実施形態では図５に示すように、膨出部７と首部８との間に、下方へ向かうに従い徐々に径方向内側へ向けて延びるテーパー状の傾斜部２１が設けられている。
ボトル缶縦断面視において傾斜部２１は、膨出部７の下端の延長線Ｌよりも外側（缶の外側であり、径方向外側と言い換えてもよい）に配置されている。そして本実施形態の例では、キャップ１５の周壁下端を裾巻き成形する裾巻きロール５０（の先端）が、傾斜部２１に対して、当接させられる。つまり裾巻きロール５０は、首部８ではなく傾斜部２１に当接する。 According to the bottle can 10 and the bottle with cap 20 according to the present embodiment described above, the base portion 5 of the can body 1 has the inclined portion 21, and the inclined portion 21 is below the bulging portion 7. Is disposed adjacent to the lower end of the peripheral wall lower end of the cap 15 fitted to the bulging portion 7, and is inclined inward in the radial direction toward the lower side. That is, unlike the conventional bottle can 100 shown in FIG. 7, the cylindrical neck 104 parallel to the can axis O is not arranged adjacent to the lower portion of the bulging portion 103. As shown, a tapered inclined portion 21 is provided between the bulging portion 7 and the neck portion 8 and gradually extends radially inward as it goes downward.
In the bottle can longitudinal cross-sectional view, the inclined portion 21 is disposed outside the extended line L at the lower end of the bulging portion 7 (the outer side of the can and may be referred to as the radially outer side). In the example of the present embodiment, the skirt winding roll 50 (the tip thereof) that skirts the lower end of the peripheral wall of the cap 15 is brought into contact with the inclined portion 21. That is, the tail winding roll 50 contacts the inclined portion 21 instead of the neck portion 8.

このため、キャッピング時に、裾巻きロール５０でキャップ１５の周壁下端を膨出部７（の下部）に裾巻き成形する際、裾巻きロール５０は、キャップ１５周壁とともに傾斜部２１にも当接するが、この傾斜部２１が径方向内側に傾斜して逃げている分、該傾斜部２１に対する裾巻きロール５０からの押圧力（横荷重）を低減できる。
詳しくは、従来のように膨出部１０３の下方に首部１０４が隣接配置された図７の構成に比べて、図５に示す本実施形態では傾斜部２１が設けられた分だけ、該傾斜部２１を従来の首部１０４よりも径方向内側に配置できる。裾巻きロール５０は、ばね力によって径方向内側へ向けて付勢されているため、裾巻きロール５０の先端（外周縁の鍔部）が、径方向内側へ逃げた傾斜部２１へと押し付けられることで、傾斜部２１が裾巻きロール５０から受ける押圧力を小さく抑えることができる。また、傾斜部２１が傾斜していることにより、裾巻きロール５０の押圧力を径方向内側以外の缶軸Ｏ方向下方等に分散させることができる。また、傾斜部２１以外の部分（傾斜部２１の下方に位置する凹曲線部２２や首部８等）に対して、裾巻きロール５０が当接することを防止することができる。従って、これらの相乗効果により、首部８の変形を効果的に抑制できる。 Therefore, at the time of capping, when the bottom end of the peripheral wall of the cap 15 is formed on the bulging portion 7 (lower part) by the bottom winding roll 50, the bottom winding roll 50 contacts the inclined portion 21 together with the peripheral wall of the cap 15. The pressing force (lateral load) from the skirt winding roll 50 against the inclined portion 21 can be reduced by the amount that the inclined portion 21 is inclined inward in the radial direction.
Specifically, as compared with the configuration of FIG. 7 in which the neck 104 is adjacently disposed below the bulging portion 103 as in the prior art, in the present embodiment shown in FIG. 21 can be disposed radially inward of the conventional neck 104. Since the tail winding roll 50 is biased radially inward by the spring force, the tip of the tail winding roll 50 (the outer peripheral edge flange) is pressed against the inclined portion 21 that has escaped radially inward. Thereby, the pressing force which the inclined part 21 receives from the tail winding roll 50 can be suppressed small. Further, since the inclined portion 21 is inclined, it is possible to disperse the pressing force of the tail winding roll 50 downward in the can axis O direction other than the radially inner side. Further, it is possible to prevent the skirt winding roll 50 from coming into contact with a portion other than the inclined portion 21 (such as the concave curve portion 22 and the neck portion 8 positioned below the inclined portion 21). Therefore, the deformation of the neck portion 8 can be effectively suppressed by these synergistic effects.

ここで、裾巻きロール５０から首部８が受ける径方向内側へ向けた押圧力と、これに応じた首部８の変形量について説明する。首部８の変形量（半径の変化量）△Ｒは、材料力学より下記の式で表すことができる。
△Ｒ＝（Ｒ２／ｔＥ）×Ｐ
上記式のうち、Ｐは外圧（裾巻きロール５０から首部８が径方向内側へ向けて受ける圧力）、Ｒは首部８の半径（内径）、ｔは首部８の厚さ（肉厚）、Ｅはヤング率である。上記式より、外圧Ｐ、厚さｔ及びヤング率Ｅが一定の場合には、首部８の変形量△Ｒは、首部８の半径Ｒの二乗に比例することがわかる。つまり、首部８の半径Ｒが小さくなれば、首部８の変形量△Ｒも、半径Ｒの二乗に比例して小さくなる（なお、実際には半径Ｒが変化すると厚さｔも僅かに変化するが、微小量であるためここでは考慮しないこととする）。 Here, the pressing force toward the radially inner side received by the neck portion 8 from the tail winding roll 50 and the deformation amount of the neck portion 8 according to the pressing force will be described. The amount of deformation (the amount of change in radius) ΔR of the neck 8 can be expressed by the following equation from the material mechanics.
ΔR = (R 2 / tE) × P
In the above formula, P is an external pressure (pressure that the neck 8 receives from the skirt roll 50 toward the inside in the radial direction), R is a radius (inner diameter) of the neck 8, t is a thickness (wall thickness) of the neck 8, E Is Young's modulus. From the above formula, it can be seen that when the external pressure P, the thickness t, and the Young's modulus E are constant, the deformation amount ΔR of the neck portion 8 is proportional to the square of the radius R of the neck portion 8. That is, when the radius R of the neck portion 8 is reduced, the deformation amount ΔR of the neck portion 8 is also reduced in proportion to the square of the radius R (in practice, the thickness t slightly changes as the radius R changes). However, since it is a minute amount, it is not considered here).

本実施形態では、上述したように首部８の上方に傾斜部２１が形成されている分、該首部８の外径が小さくされている。つまり、図６及び図７に示す従来のボトル缶１００に比べて、図１〜図５に示す本実施形態のボトル缶１０は、首部８の半径Ｒが小さくされているため、仮に裾巻きロール５０から受ける押圧力が従来と同じであっても、首部８の変形量△Ｒは確実に低減されて、首部８の変形が防止される。   In the present embodiment, as described above, the outer diameter of the neck portion 8 is reduced by the amount of the inclined portion 21 formed above the neck portion 8. That is, compared with the conventional bottle can 100 shown in FIG. 6 and FIG. 7, the bottle can 10 of the present embodiment shown in FIGS. Even if the pressing force received from 50 is the same as the conventional one, the deformation amount ΔR of the neck portion 8 is reliably reduced and the deformation of the neck portion 8 is prevented.

以上より本実施形態のボトル缶１０及びキャップ付きボトル缶２０によれば、缶の薄肉化を図った場合であっても、キャッピング時の成形荷重（軸荷重や横荷重）によって首部８が変形することを確実に防止できる。   As described above, according to the bottle can 10 and the bottle with cap 20 of the present embodiment, the neck portion 8 is deformed by a molding load (axial load or lateral load) at the time of capping even when the can is thinned. Can be surely prevented.

また本実施形態では、膨出部７の最大外径（直径）と、首部８の最小外径（直径）との差が、２．５〜１０．０ｍｍであるので、下記の作用効果を奏する。
すなわち上記構成のように、膨出部７の最大外径と首部８の最小外径との差が、２．５ｍｍ以上であれば、膨出部７と首部８との間に位置する傾斜部２１の長さを十分に確保でき、裾巻きロール５０が首部８に当たることをより確実に防止することができる。また、首部８の半径Ｒが十分に小さくされて、首部８の変形量△Ｒを安定して小さく抑えられる。
また上記差が、１０．０ｍｍ以下であれば、傾斜部２１の成形性が良好に維持される。つまり、本実施形態で説明したようにダイ加工によって傾斜部２１を成形する場合において、該傾斜部２１が首部８から上方へ向けて急激に拡径させられることにより生じる割れ等を防止できる。
なお、上述の作用効果をさらに格別顕著なものとするには、上記差が３．０〜７．０ｍｍであることがより好ましい。 Moreover, in this embodiment, since the difference of the maximum outer diameter (diameter) of the bulging part 7 and the minimum outer diameter (diameter) of the neck part 8 is 2.5-10.0 mm, there exists the following effect. .
That is, as in the above configuration, if the difference between the maximum outer diameter of the bulging portion 7 and the minimum outer diameter of the neck portion 8 is 2.5 mm or more, the inclined portion positioned between the bulging portion 7 and the neck portion 8. The length of 21 can be sufficiently secured, and the tail winding roll 50 can be more reliably prevented from hitting the neck portion 8. Further, the radius R of the neck portion 8 is made sufficiently small, and the deformation amount ΔR of the neck portion 8 can be stably kept small.
Moreover, if the said difference is 10.0 mm or less, the moldability of the inclination part 21 will be maintained favorable. That is, in the case where the inclined portion 21 is formed by die processing as described in the present embodiment, it is possible to prevent cracks and the like caused by the diameter of the inclined portion 21 being rapidly expanded upward from the neck portion 8.
In addition, in order to make the above-mentioned effect more remarkable, it is more preferable that the difference is 3.0 to 7.0 mm.

また本実施形態では、缶軸Ｏ方向に沿うボトル缶１０の縦断面視で、缶軸Ｏに対して傾斜部２１が傾斜する角度θが、２０〜４０°であるので、下記の作用効果を奏する。
すなわち上記構成のように、ボトル缶１０の缶軸Ｏを含む縦断面視で、缶軸Ｏに対して傾斜部２１が傾斜する角度θが２０°以上であれば、傾斜部２１が十分に傾斜させられて（寝かされて）、該傾斜部２１に裾巻きロール５０が強く当たることをより確実に防止できる。
また上記縦断面視で、缶軸Ｏに対して傾斜部２１が傾斜する角度θが４０°以下であれば、傾斜部２１が大きく傾斜させられ過ぎて（寝かされ過ぎて）、口金部５の耐荷重（特に軸荷重への耐力）が低減するようなことを防止できる。 Further, in the present embodiment, the angle θ at which the inclined portion 21 is inclined with respect to the can axis O is 20 to 40 ° in a vertical cross-sectional view of the bottle can 10 along the can axis O direction. Play.
That is, when the angle θ at which the inclined portion 21 is inclined with respect to the can axis O is 20 ° or more in a longitudinal sectional view including the can axis O of the bottle can 10 as in the above configuration, the inclined portion 21 is sufficiently inclined. It is possible to more reliably prevent the skirt winding roll 50 from hitting the inclined portion 21 strongly.
In addition, when the angle θ at which the inclined portion 21 is inclined with respect to the can axis O in the longitudinal sectional view is 40 ° or less, the inclined portion 21 is excessively inclined (being laid down too much), and the mouthpiece 5 It is possible to prevent a reduction in the load resistance (especially the load resistance to the axial load).

また本実施形態では、ボトル缶１０の縦断面視において、傾斜部２１が直線状に形成されているので、該傾斜部２１を膨出部７の下端（直線部１９）に段差なく接続しやすい。   Moreover, in this embodiment, since the inclined part 21 is formed in linear form in the longitudinal cross-sectional view of the bottle can 10, it is easy to connect this inclined part 21 to the lower end (straight part 19) of the bulging part 7 without a level | step difference. .

また本実施形態では、ボトル缶１０の縦断面視で、膨出部７と傾斜部２１とが、互いの接続部分において接するように繋がっているので、口金部５を成形しやすく、また、膨出部７と傾斜部２１との接続部分を起点として口金部５が座屈変形することを防止できる。また、口金部５の外観（美観）がよい。   Moreover, in this embodiment, since the bulging part 7 and the inclined part 21 are connected so that it may contact | connect in a mutual connection part by the longitudinal cross-sectional view of the bottle can 10, it is easy to shape | mold the nozzle | cap | die part 5, and, It is possible to prevent the base portion 5 from buckling and deforming from the connection portion between the protruding portion 7 and the inclined portion 21 as a starting point. Moreover, the external appearance (aesthetic appearance) of the base part 5 is good.

また本実施形態では、キャップ１５の周壁下端から傾斜部２１の下端までの缶軸Ｏ方向に沿う距離Ａが、２〜６ｍｍであるので、下記の作用効果を奏する。
すなわち上記構成のように、キャップ１５の周壁下端と、傾斜部２１の下端との缶軸Ｏ方向の距離Ａが、２ｍｍ以上であれば、裾巻きロール５０が首部８に当たることをより確実に防止できる。これは、裾巻きロール５０の外周縁（鍔部）の上下方向の厚さが２ｍｍ以上であるためである。
また上記距離Ａが、６ｍｍ以下であれば、傾斜部２１が長くなり過ぎることによる傾斜部２１の耐軸荷重の低減を抑制できる。
また、キャップ１５装着前のボトル缶１０において、膨出部７の下端７ａから傾斜部２１の下端までの缶軸Ｏ方向の距離が、２．２〜６．２ｍｍであるので、上記同様の作用効果が得られる。 Moreover, in this embodiment, since the distance A along the can axis | shaft O direction from the surrounding wall lower end of the cap 15 to the lower end of the inclination part 21 is 2-6 mm, there exists the following effect.
That is, as in the above configuration, if the distance A in the direction of the can axis O between the lower end of the peripheral wall of the cap 15 and the lower end of the inclined portion 21 is 2 mm or more, the tail winding roll 50 is more reliably prevented from hitting the neck 8. it can. This is because the thickness in the vertical direction of the outer peripheral edge (edge) of the skirt winding roll 50 is 2 mm or more.
Moreover, if the said distance A is 6 mm or less, the reduction | decrease of the axial load resistance of the inclination part 21 by the inclination part 21 becoming too long can be suppressed.
Further, in the bottle can 10 before the cap 15 is mounted, the distance in the can axis O direction from the lower end 7a of the bulging portion 7 to the lower end of the inclined portion 21 is 2.2 to 6.2 mm. An effect is obtained.

また本実施形態では、キャッピング時に裾巻きロール５０が傾斜部２１に当接させられることで、該傾斜部２１に、缶軸Ｏ回りに延びる裾巻きロール痕が形成される。本実施形態では上述したように、裾巻きロール５０による傾斜部２１への押圧力を小さく抑えることができるため、裾巻きロール痕を目立たなくすることができる。そして首部８の変形も抑制される。   Further, in the present embodiment, the skirt winding roll 50 extending around the can axis O is formed on the inclined portion 21 by causing the skirt winding roll 50 to contact the inclined portion 21 during capping. In the present embodiment, as described above, the pressing force applied to the inclined portion 21 by the skirt winding roll 50 can be kept small, so that the skirt winding trace can be made inconspicuous. And the deformation | transformation of the neck part 8 is also suppressed.

また本実施形態では、キャッピング時に裾巻きロール５０が首部８に当接しないので、該首部８には、缶軸Ｏ回りに延びる裾巻きロール痕が形成されない。首部８に裾巻きロール痕が形成されないため、口金部５の美観を高めることができる。そして首部８の変形がより確実に防止される。   Further, in this embodiment, since the skirt winding roll 50 does not contact the neck portion 8 at the time of capping, the skirt winding trace extending around the can axis O is not formed on the neck portion 8. Since no skirt roll trace is formed on the neck portion 8, the beauty of the base portion 5 can be enhanced. And the deformation | transformation of the neck part 8 is prevented more reliably.

また本実施形態では、ボトル缶１０の縦断面視で、缶軸Ｏに対して膨出部７の下部が傾斜する角度（缶軸Ｏと延長線Ｌとの間に形成される角度。以下同様）が３６°以上であるので、膨出部７の下部が十分に傾斜させられて（寝かされて）、キャップ１５の周壁の裾巻きが確実に行われ、キャップ１５のすっぽ抜け（口金部５からの上方への離脱）が発生しない。
また上記縦断面視で、缶軸Ｏに対して膨出部７の下部が傾斜する角度が５０°以下であるので、膨出部７の下部が大きく傾斜させられ過ぎて（寝かされ過ぎて）、膨出部７の耐荷重（特に軸荷重への耐力）が低減するようなことを防止できる。 In the present embodiment, the angle at which the lower portion of the bulging portion 7 is inclined with respect to the can axis O (an angle formed between the can axis O and the extension line L. The same applies hereinafter) in a longitudinal sectional view of the bottle can 10. ) Is 36 ° or more, the lower portion of the bulging portion 7 is sufficiently inclined (being laid down), and the skirt winding of the peripheral wall of the cap 15 is performed reliably, and the cap 15 is completely removed (the base). (Upward separation from the part 5) does not occur.
In addition, since the angle at which the lower portion of the bulging portion 7 is inclined with respect to the can axis O is 50 ° or less in the longitudinal sectional view, the lower portion of the bulging portion 7 is excessively inclined (being laid down too much). ), It is possible to prevent the load resistance of the bulging portion 7 (particularly the proof strength against axial load) from being reduced.

なお、本発明は前述の実施形態に限定されるものではなく、例えば下記に説明するように、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。   The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention, for example, as described below.

前述の実施形態では、膨出部７と肩部４との間に、傾斜部２１と、凹曲線部２２と、首部８と、首部８の下方に隣接する凹曲線部と、が備えられているとしたが、これに限定されるものではない。すなわち膨出部７の下方には、下方へ向かうに従い径方向内側へ向けて傾斜する傾斜部２１と、傾斜部２１の下方に配置されて該傾斜部２１よりも小径に形成された首部８と、が備えられていればよく、それ以外の構成要素については、前述の実施形態で説明した形状以外の形状であってもよい。   In the above-described embodiment, the inclined portion 21, the concave curve portion 22, the neck portion 8, and the concave curve portion adjacent below the neck portion 8 are provided between the bulging portion 7 and the shoulder portion 4. However, the present invention is not limited to this. That is, below the bulging portion 7, an inclined portion 21 that inclines radially inward as it goes downward, and a neck portion 8 that is disposed below the inclined portion 21 and has a smaller diameter than the inclined portion 21. The other components may be in shapes other than those described in the above embodiment.

また、前述の実施形態では、缶軸Ｏ方向に沿うボトル缶１０の縦断面視で、傾斜部２１が直線状をなしているとしたが、これに限定されるものではない。缶軸Ｏを含む縦断面視で、傾斜部２１が凹曲線状をなしていてもよい。この場合、傾斜部２１は、缶の内側（径方向内側）へ向けて窪む凹曲面状に形成される。ボトル缶縦断面視で、傾斜部２１が凹曲線状に形成されることで、成形性がより向上する。   Further, in the above-described embodiment, the inclined portion 21 is linear in the longitudinal sectional view of the bottle can 10 along the can axis O direction, but the present invention is not limited to this. In the longitudinal sectional view including the can axis O, the inclined portion 21 may have a concave curve shape. In this case, the inclined portion 21 is formed in a concave curved surface shape that is recessed toward the inner side (radially inner side) of the can. Formability is further improved by forming the inclined portion 21 in the shape of a concave curve in the bottle can longitudinal sectional view.

また、缶軸Ｏを含む縦断面視において、傾斜部２１を直線状や凹曲線状に形成する代わりに、凸曲線状に形成してもよい。この場合、傾斜部２１は、缶の外側（径方向外側）へ向けて膨らむ凸曲面状をなす。
或いは、ボトル缶縦断面視において、例えば直線、凹曲線及び凸曲線のいずれか２つ以上を組み合わせた複合的な形状の傾斜部２１を用いてもよい。 Further, in the longitudinal sectional view including the can axis O, the inclined portion 21 may be formed in a convex curve shape instead of being formed in a linear shape or a concave curve shape. In this case, the inclined portion 21 has a convex curved shape that swells toward the outer side (radially outer side) of the can.
Or you may use the inclined part 21 of the composite shape which combined any two or more of a straight line, a concave curve, and a convex curve, for example in bottle can longitudinal cross-sectional view.

また、前述の実施形態では、裾巻きロール５０でキャップ１５の周壁下端を膨出部７に裾巻き成形する際、裾巻きロール５０が、キャップ１５周壁とともに傾斜部２１にも当接するとしたが、これに限定されるものではない。裾巻きロール５０は、傾斜部２１に当接されなくてもよい。この場合、首部８だけでなく傾斜部２１にも、裾巻きロール痕は形成されない。   In the above-described embodiment, when the bottom end of the peripheral wall of the cap 15 is formed on the bulging portion 7 with the bottom winding roll 50, the bottom winding roll 50 comes into contact with the inclined portion 21 together with the peripheral wall of the cap 15. However, the present invention is not limited to this. The tail winding roll 50 may not be in contact with the inclined portion 21. In this case, no skirt roll trace is formed not only on the neck portion 8 but also on the inclined portion 21.

また、前述の実施形態では、ボトル缶縦断面視において、膨出部７の下端に直線部１９が配置されており、該直線部１９の延長線Ｌに対して、傾斜部２１が外側（缶の外側、径方向外側）に配置されるとしたが、膨出部７の下端には、直線部１９の代わりに凸曲線部が配置されていてもよい。この場合、膨出部７の下端の延長線Ｌとは、膨出部７と傾斜部２１との接続点（境界点、変曲点）における接線を指す（前記接線とは、少なくとも膨出部７の前記凸曲線部の下端に接する接線である）。   Further, in the above-described embodiment, the straight portion 19 is disposed at the lower end of the bulging portion 7 in the vertical view of the bottle can, and the inclined portion 21 is outside (the can) with respect to the extension line L of the straight portion 19. However, instead of the straight line portion 19, a convex curve portion may be arranged at the lower end of the bulging portion 7. In this case, the extension line L at the lower end of the bulging portion 7 refers to a tangent at a connection point (boundary point, inflection point) between the bulging portion 7 and the inclined portion 21 (the tangent is at least the bulging portion. 7 is a tangent line in contact with the lower end of the convex curve portion).

また、前述の実施形態では、ボトル缶１０の縦断面視で、膨出部７と傾斜部２１とが、互いの接続部分において接するように繋がっていることとしたが、これに限定されるものではない。例えば、ボトル缶縦断面視において、膨出部７と傾斜部２１との接続部分が、（鈍角の）屈曲状に形成されていてもよい。   In the above-described embodiment, the bulging portion 7 and the inclined portion 21 are connected so as to come into contact with each other in the longitudinal sectional view of the bottle can 10. However, the present invention is limited to this. is not. For example, in the bottle can longitudinal cross-sectional view, the connection part of the bulging part 7 and the inclination part 21 may be formed in the bent shape (obtuse angle).

また、前述の実施形態では、口金部５の膨出部７における最大外径（直径）が３８．０ｍｍ程度とされた、３８ｍｍ口径のボトル缶１０を例に挙げて説明したが、これに限定されるものではない。すなわち本発明は、例えば、口金部の膨出部における最大外径（直径）が３３．０ｍｍや２８．０ｍｍ程度とされた口径のボトル缶にも適用可能で、２８ｍｍ〜３８ｍｍの間の膨出部直径であってもよい。   In the above-described embodiment, the bottle can 10 having a 38 mm diameter in which the maximum outer diameter (diameter) of the bulging portion 7 of the base portion 5 is about 38.0 mm has been described as an example. However, the present invention is not limited thereto. Is not to be done. That is, the present invention can be applied to, for example, a bottle can having a maximum outer diameter (diameter) of about 33.0 mm or 28.0 mm at the bulging portion of the cap portion, and bulging between 28 mm and 38 mm. It may be a part diameter.

また、前述の実施形態では、ボトル缶１０として、缶胴１と缶底２とが一体に形成された例を挙げて説明したが、ボトル缶１０は、缶胴１と缶底２とが別体に形成され、これらが組み合わされたものであってもよい。   Further, in the above-described embodiment, an example in which the can body 1 and the can bottom 2 are integrally formed as the bottle can 10 has been described. However, the can body 1 and the can bottom 2 are separated from each other in the bottle can 10. It may be formed in a body and a combination thereof.

その他、本発明の趣旨から逸脱しない範囲において、前述の実施形態、変形例及びなお書き等で説明した各構成（構成要素）を組み合わせてもよく、また、構成の付加、省略、置換、その他の変更が可能である。また本発明は、前述した実施形態によって限定されることはなく、特許請求の範囲によってのみ限定される。   In addition, in the range which does not deviate from the meaning of this invention, you may combine each structure (component) demonstrated by the above-mentioned embodiment, a modification, and a remark etc., addition of a structure, omission, substitution, others It can be changed. Further, the present invention is not limited by the above-described embodiments, and is limited only by the scope of the claims.

本発明のボトル缶及びキャップ付きボトル缶は、缶の薄肉化を図った場合であっても、キャッピング時の成形荷重による首部の変形を防止できる。従って、産業上の利用可能性を有する。   The bottle can and the bottle can with a cap of the present invention can prevent deformation of the neck due to a molding load during capping even when the can is thinned. Therefore, it has industrial applicability.

１ 缶胴
２ 缶底
５ 口金部
６ ねじ部
７ 膨出部
７ａ 膨出部の下端
８ 首部
１０ ボトル缶
１５ キャップ
１９ 直線部（膨出部の下部）
２０ キャップ付きボトル缶
２１ 傾斜部
５０ 裾巻きロール
Ａ 距離
Ｌ 延長線
Ｏ 缶軸
θ 角度 DESCRIPTION OF SYMBOLS 1 Can body 2 Can bottom 5 Cap part 6 Screw part 7 Expansion part 7a Lower end of expansion part 8 Neck part 10 Bottle can 15 Cap 19 Straight part (lower part of expansion part)
20 Bottle can with cap 21 Inclined part 50 Hem roll A A Distance L Extension line O Can axis θ Angle

Claims (10)

缶胴と缶底とを備えた有底筒状のボトル缶であって、
前記缶胴の口金部は、
ねじ部と、
前記ねじ部の下方に隣接配置され、径方向外側へ向けて膨出するとともに缶軸回りの全周にわたって延び、前記口金部に装着される有頂筒状のキャップの周壁下端が裾巻きされる膨出部と、
前記膨出部の下方に隣接配置され、下方へ向かうに従い径方向内側へ向けて傾斜し、前記缶軸を含む縦断面視において、前記膨出部の下端の延長線よりも外側に位置する傾斜部と、を備えたボトル缶。 A bottomed cylindrical bottle can having a can body and a bottom,
The base part of the can body is
A threaded portion;
It is arranged adjacent to the lower part of the threaded portion, bulges outward in the radial direction and extends over the entire circumference around the can axis, and the lower end of the peripheral wall of the cap-shaped cylindrical cap attached to the base is wound around A bulge,
An inclination that is arranged adjacent to the lower part of the bulging part and is inclined inward in the radial direction as it goes downward, and is located outside the extended line at the lower end of the bulging part in a longitudinal sectional view including the can shaft. And a bottle can. 請求項１に記載のボトル缶であって、
前記傾斜部の下方に配置されて前記傾斜部よりも小径とされた首部を備え、
前記膨出部の最大外径と、前記首部の最小外径との差が、２．５〜１０．０ｍｍであるボトル缶。 The bottle can according to claim 1,
A neck portion disposed below the inclined portion and having a smaller diameter than the inclined portion;
A bottle can in which a difference between a maximum outer diameter of the bulging portion and a minimum outer diameter of the neck portion is 2.5 to 10.0 mm. 請求項１又は２に記載のボトル缶であって、
前記縦断面視で、前記缶軸に対して前記傾斜部が傾斜する角度が、２０〜４０°であるボトル缶。 The bottle can according to claim 1 or 2,
The bottle can whose angle which the said inclination part inclines with respect to the said can axis | shaft is 20-40 degrees by the said longitudinal cross-sectional view. 請求項１〜３のいずれか一項に記載のボトル缶であって、
前記縦断面視で、前記傾斜部が、直線状をなすボトル缶。 The bottle can according to any one of claims 1 to 3,
The bottle can in which the inclined portion forms a straight line in the longitudinal sectional view. 請求項１〜３のいずれか一項に記載のボトル缶であって、
前記縦断面視で、前記傾斜部が、凹曲線状をなすボトル缶。 The bottle can according to any one of claims 1 to 3,
The bottle can in which the inclined portion forms a concave curve shape in the longitudinal sectional view. 請求項１〜５のいずれか一項に記載のボトル缶であって、
前記縦断面視で、前記膨出部と前記傾斜部とが、互いの接続部分において接するように繋がっているボトル缶。 It is a bottle can according to any one of claims 1 to 5,
A bottle can in which the bulging portion and the inclined portion are connected so as to come into contact with each other in the longitudinal sectional view. 缶胴と缶底とを備えた有底筒状のボトル缶と、
前記缶胴の口金部に装着された有頂筒状のキャップと、を備えたキャップ付きボトル缶であって、
前記口金部は、
ねじ部と、
前記ねじ部の下方に隣接配置され、径方向外側へ向けて膨出するとともに缶軸回りの全周にわたって延び、前記キャップの周壁下端が裾巻きされる膨出部と、
前記キャップの周壁下端の下方に隣接配置され、下方へ向かうに従い径方向内側へ向けて傾斜し、前記缶軸を含む縦断面視において、前記膨出部の下端の延長線よりも外側に位置する傾斜部と、を備えたキャップ付きボトル缶。 A bottomed cylindrical bottle can with a can body and a can bottom;
A cap with a cap provided on the cap portion of the can body, and a bottle can with a cap,
The base part is
A threaded portion;
A bulging portion that is arranged adjacent to the lower portion of the screw portion, bulges outward in the radial direction and extends over the entire circumference around the can axis, and the lower end of the peripheral wall of the cap is wound around the bottom;
It is arranged adjacent to the lower end of the lower end of the peripheral wall of the cap, is inclined radially inward as it goes downward, and is located outside the extended line of the lower end of the bulging portion in a longitudinal sectional view including the can shaft. A bottle can with a cap including an inclined portion. 請求項７に記載のキャップ付きボトル缶であって、
前記キャップの周壁下端から前記傾斜部の下端までの前記缶軸方向に沿う距離が、２〜６ｍｍであるキャップ付きボトル缶。 A bottle can with a cap according to claim 7,
The bottle can with a cap whose distance along the can axial direction from the lower end of the peripheral wall of the cap to the lower end of the inclined portion is 2 to 6 mm. 請求項７又は８に記載のキャップ付きボトル缶であって、
前記傾斜部に、前記缶軸回りに延びる裾巻きロール痕が形成されたキャップ付きボトル缶。 A bottle can with a cap according to claim 7 or 8,
A bottled can with a cap in which a bottom winding roll trace extending around the can axis is formed on the inclined portion. 請求項７〜９のいずれか一項に記載のキャップ付きボトル缶であって、
前記傾斜部の下方に配置されて前記傾斜部よりも小径とされた首部を備え、
前記首部に、前記缶軸回りに延びる裾巻きロール痕が形成されていないキャップ付きボトル缶。 A bottle can with a cap according to any one of claims 7 to 9,
A neck portion disposed below the inclined portion and having a smaller diameter than the inclined portion;
A bottled can with a cap in which a skirt roll trace extending around the can axis is not formed on the neck.
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002096895A (en) * 2000-09-22 2002-04-02 Japan Crown Cork Co Ltd Cap sealing apparatus
JP2004276990A (en) * 2003-03-18 2004-10-07 Mitsubishi Materials Corp Bottle, capping head, capping apparatus, and capping method
JP2005052890A (en) * 2003-07-23 2005-03-03 Mitsubishi Materials Corp Device and method for manufacturing bottle can body, and bottle can
JP2005096843A (en) * 2003-09-26 2005-04-14 Mitsubishi Materials Corp Bottle can and bottle can with cap
JP2007091330A (en) * 2005-09-30 2007-04-12 Universal Seikan Kk Bottle can
JP2017514756A (en) * 2014-03-26 2017-06-08 アルダフ エムピー ウエスト フランス Metal container comprising a neck capable of receiving a screw cap type sealing element

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4372459B2 (en) 2003-06-04 2009-11-25 ユニバーサル製缶株式会社 cap
JP7033857B2 (en) 2017-05-24 2022-03-11 ユニバーサル製缶株式会社 Bottle cans and bottle cans with caps

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002096895A (en) * 2000-09-22 2002-04-02 Japan Crown Cork Co Ltd Cap sealing apparatus
JP2004276990A (en) * 2003-03-18 2004-10-07 Mitsubishi Materials Corp Bottle, capping head, capping apparatus, and capping method
JP2005052890A (en) * 2003-07-23 2005-03-03 Mitsubishi Materials Corp Device and method for manufacturing bottle can body, and bottle can
JP2005096843A (en) * 2003-09-26 2005-04-14 Mitsubishi Materials Corp Bottle can and bottle can with cap
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JP2017514756A (en) * 2014-03-26 2017-06-08 アルダフ エムピー ウエスト フランス Metal container comprising a neck capable of receiving a screw cap type sealing element

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