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JP4908544B2 - Manufacturing method of bottle can body - Google Patents

Manufacturing method of bottle can body Download PDF

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Publication number
JP4908544B2
JP4908544B2 JP2009094880A JP2009094880A JP4908544B2 JP 4908544 B2 JP4908544 B2 JP 4908544B2 JP 2009094880 A JP2009094880 A JP 2009094880A JP 2009094880 A JP2009094880 A JP 2009094880A JP 4908544 B2 JP4908544 B2 JP 4908544B2
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cap
screw
bottle
diameter
base
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JP2009196713A (en
JP2009196713A5 (en
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達也 花房
隆一 伊藤
正宏 細井
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Altemira Can Co Ltd
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Universal Can Corp
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Description

この発明は、口金部にキャップが被着されるボトル缶体の製造方法に関する。 This invention relates to a method of manufacturing a bottle can member which cap the ferrule portion Ru is deposited.

金属製の缶体を絞り加工して得られる、いわゆるボトル缶体1は、有底筒状に形成されたボトル缶体1の開口部に、図6(a)に示すように口金部2とその外周に形成されたねじ部3とを有する。このねじ部3には、ボトル缶体1内への飲料水等からなる製品が充填された後、キャップ5の外周がねじ部3に倣って押圧成形されることにより、キャップ5が図6(b)のように被着される。キャップ5は、ボトル缶体1のねじ部3に倣ってキャップねじ部7が形成されるキャップ本体上部6と、このキャップ本体上部6の下端に、膨出部4の下面側に巻き込むように形成されるキャップ本体下部9とからなっている。   A so-called bottle can body 1 obtained by drawing a metal can body is formed at the opening of the bottle can body 1 formed in a bottomed cylindrical shape with a base portion 2 as shown in FIG. And a threaded portion 3 formed on the outer periphery thereof. The threaded portion 3 is filled with a product made of drinking water or the like into the bottle can body 1, and then the outer periphery of the cap 5 is press-molded following the threaded portion 3, so that the cap 5 is shown in FIG. It is applied as in b). The cap 5 is formed so as to be wound around the lower surface side of the bulging portion 4 at the lower end of the cap body upper portion 6 where the cap screw portion 7 is formed following the screw portion 3 of the bottle can body 1. And a cap body lower part 9 to be formed.

また、被着される前のキャップ5は、図6(c)に示すようなキャップ材5’のような形状とされており、上部が天板によって塞がれると共に、その下部が下方に向かい真直に開口された筒状をなしている。ブリッジ部8は、円周方向に形成された複数の切り込みであるスコア8aと、ブリッジ8bとが交互に配設されており、ブリッジ部8を介してキャップ本体下部9が連設されている。   Further, the cap 5 before being attached has a shape like a cap material 5 ′ as shown in FIG. 6C. The upper portion is closed by the top plate, and the lower portion faces downward. It has a cylindrical shape that opens straight. In the bridge portion 8, scores 8 a that are a plurality of cuts formed in the circumferential direction and bridges 8 b are alternately arranged, and a cap main body lower portion 9 is continuously provided via the bridge portion 8.

キャップ5をボトル缶体1から取り外すときには、キャップ5とボトル缶体1とに相対回転方向の回転力を加える。この回転力は、ねじ部3によりキャップ5が上向きに移動するように働く。しかし、キャップ本体下部9はボトル缶体1の膨出部4に係止されているので、ブリッジ8bが破断しキャップ本体上部6とキャップ本体下部9が分離する。そして、キャップ本体下部9は口金部2に残され、キャップ本体上部6はボトル缶体1から離脱される。つまり、利用者がブリッジ部8を破断するようキャップ5を回すことでボトル缶体1から開栓できるようになっている。   When removing the cap 5 from the bottle can body 1, a rotational force in the relative rotation direction is applied to the cap 5 and the bottle can body 1. This rotational force acts so that the cap 5 moves upward by the screw portion 3. However, since the cap main body lower portion 9 is locked to the bulging portion 4 of the bottle can body 1, the bridge 8b is broken and the cap main body upper portion 6 and the cap main body lower portion 9 are separated. Then, the cap main body lower part 9 is left in the base part 2, and the cap main body upper part 6 is detached from the bottle can body 1. That is, the user can open the bottle can 1 by turning the cap 5 so as to break the bridge portion 8.

従来、このようなねじ部3を有するボトル缶体1は、図7(a)に示す有底円筒状のボトル缶体1の開口部を、同図(b)に示すように、一旦縮径して口金部2を形成した後、同図(c)に示すように、その口金部2の開口端から所定距離分だけ再び拡径して拡径部2′を形成し、さらに同図(d)に示すように、開口端から一定の距離にねじ部3を形成することでねじ部3の形成されていない拡径部分を膨出部4として残すことにより、膨出部4を形成している。   Conventionally, a bottle can body 1 having such a threaded portion 3 once reduces the diameter of the opening of the bottomed cylindrical bottle can body 1 shown in FIG. 7A as shown in FIG. Then, after forming the base part 2, as shown in FIG. 5C, the diameter is expanded again by a predetermined distance from the opening end of the base part 2 to form an enlarged diameter part 2 ′. As shown in d), by forming the threaded portion 3 at a certain distance from the opening end, the expanded portion where the threaded portion 3 is not formed is left as the bulged portion 4, thereby forming the bulged portion 4. ing.

図6に示されている、ボトル缶体1に被着されているキャップ5の外径Aは、一般に、28mm,33mm,38mmの三つの規格が存在している。ボトル缶体1の口金部2の外径Bは、キャップ5の外径Aよりも小さく形成される。ねじ部3は、38mmの外径からなるキャップ5が被着される場合、ねじとして有効に機能する部分の巻数である有効ねじ巻数が1.5〜1.7巻程度に形成されている。   As for the outer diameter A of the cap 5 attached to the bottle can body 1 shown in FIG. 6, there are generally three standards of 28 mm, 33 mm, and 38 mm. The outer diameter B of the cap portion 2 of the bottle can body 1 is formed smaller than the outer diameter A of the cap 5. When the cap 5 having an outer diameter of 38 mm is attached to the screw portion 3, the number of effective screw turns that is the number of turns of the portion that effectively functions as a screw is formed to be about 1.5 to 1.7 turns.

ここで、有効ねじ巻数とは、図8に示された有効ねじ部Xの巻数のことである。図8は、ねじ部3の上面図を簡略的に示した説明図で、Y,Zが不完全ねじ部、Wが完全ねじ部で、Cが中心点である。ねじ部3は、山部3aと谷部3bとから形成されており、口金部2の上端側に始まり側の不完全ねじ部Yが形成され、口金部2の基端側に終わり側の不完全ねじ部Zが形成されている。不完全ねじ部Yと不完全ねじ部Zとの間の完全ねじ部Wは、山部3aと谷部3bがそれぞれ規定の外径で形成されている。不完全ねじ部Yは、その端点Y1から完全ねじ部Wの始点W1まで徐々にねじ山が拡径されており、不完全ねじ部Zは、完全ねじ部Wの終点W2からその端点Z2まで徐々にねじ谷が拡径される。   Here, the effective number of turns of the screw is the number of turns of the effective screw portion X shown in FIG. FIG. 8 is an explanatory diagram schematically showing a top view of the threaded portion 3, where Y and Z are incomplete threaded portions, W is a completely threaded portion, and C is a center point. The screw portion 3 is formed of a crest portion 3 a and a trough portion 3 b, and an incomplete screw portion Y on the start side is formed on the upper end side of the base portion 2, and an end side non-end portion is formed on the base end side of the base portion 2. A complete thread portion Z is formed. As for the complete thread part W between the incomplete thread part Y and the incomplete thread part Z, the peak part 3a and the trough part 3b are each formed with the defined outer diameter. The thread portion of the incomplete thread portion Y is gradually expanded from the end point Y1 to the start point W1 of the complete thread portion W, and the incomplete thread portion Z gradually increases from the end point W2 of the complete thread portion W to the end point Z2. The screw valley is enlarged.

有効ねじ部Xは、不完全ねじ部Yの中間の有効ねじ始点X1から、完全ねじ部Wすべてを含み、不完全ねじ部Zの中間の有効ねじ終点X2までのねじ部である。有効ねじ始点X1は、図8に示すねじ部3の上面視における、端点Y1と中心点Cと始点W1で作られる不完全ねじ部Yの狭角∠αの2等分線L1と不完全ねじ部Yとの交点であり、有効ねじ終点X2は、終点W2と中心点Cと端点Z2で作られる不完全ねじ部Zの狭角∠βの2等分線L2と不完全ねじ部Zの交点である。   The effective screw portion X is a screw portion from the effective screw start point X1 in the middle of the incomplete screw portion Y to the effective screw end point X2 in the middle of the incomplete screw portion Z including all the complete screw portions W. The effective screw start point X1 is the bisector L1 of the narrow angle ∠α of the incomplete screw portion Y formed by the end point Y1, the center point C, and the start point W1 and the incomplete screw in the top view of the screw portion 3 shown in FIG. The effective screw end point X2 is the intersection point of the incomplete screw portion Z with the bisector L2 of the narrow angle ∠β of the incomplete screw portion Z formed by the end point W2, the center point C, and the end point Z2. It is.

特開2000−191006号公報JP 2000-191006 A

ところが、従来のボトル缶体1において、ボトル缶体1の口金部2に設けられているねじ部3の有効ねじ巻数が1.5〜1.7巻程度であると、口金部2の基端部から先端部に向かってねじが2本ある部分と、ねじが1本しかない部分とが生じ、その本数の差に伴う問題があった。即ち、上記巻数であると、ボトル缶体1にキャップ5を被着し、ボトル内を陽圧とした場合、キャップ5を押し上げる圧力が加わり、ねじが1本しかない部分ではキャップ5を締結する力が弱く、キャップ5が上方にずれてしまう。つまり、キャップ5がボトル缶体1に対して偏ってしまうので、ねじが1本の部分でブリッジ8bが引っ張られて破断されてしまう。いわゆる、ブリッジ切れが起こるという不具合があった。また、ネジの巻数が多い箇所では少ない箇所より、キャップ装着時にねじ部3の圧縮される量が大きくなり、このため周方向におけるシール性に不均一が生じて気密性が低下するおそれがあった。   However, in the conventional bottle can body 1, when the effective screw winding number of the screw portion 3 provided on the base portion 2 of the bottle can body 1 is about 1.5 to 1.7 turns, the base end of the base portion 2. A portion having two screws from the portion toward the tip portion and a portion having only one screw are generated, and there is a problem associated with the difference in the number. That is, when the number of turns is as described above, when the cap 5 is attached to the bottle can 1 and the inside of the bottle is set to a positive pressure, a pressure for pushing up the cap 5 is applied, and the cap 5 is fastened at a portion having only one screw. The force is weak and the cap 5 is displaced upward. That is, since the cap 5 is biased with respect to the bottle can 1, the bridge 8 b is pulled at one portion of the screw and is broken. There was a problem that the bridge was broken. In addition, the amount of compression of the screw portion 3 when the cap is attached is larger in the portion where the number of turns of the screw is larger than in the portion where the number of turns of the screw is small. .

この対策として、有効ねじ巻数を増やす事が考えられる。ところが、ボトル缶体1にキャップ5を被着する工程において、キャップ径が28mm程度の小さい径では、900N程度の荷重でキャップをボトルに押し付けながら巻き締めされるにすぎないが、キャップ径が33mm以上の大きな径になると、缶内の圧力がキャップ天面を押し上げる力が強く、成形領域も大きくなるので、プレッシャーブロックで1050〜1200Nの力でキャップをボトル缶天面に押し付けながら巻き締めが行われる。   As a countermeasure, it is conceivable to increase the number of effective screw turns. However, in the process of attaching the cap 5 to the bottle can body 1, when the cap diameter is as small as about 28 mm, the cap diameter is only 33 mm while being pressed against the bottle with a load of about 900 N. When the diameter is larger than the above, the pressure inside the can pushes the top of the cap strong, and the molding area also becomes large, so the pressure block is 1050 to 1200 N and the cap is pressed against the top of the bottle can. Is called.

例えば、有効ねじ巻き数を2.5〜3巻とした場合には、ねじ本数が2本の部分と3本の部分が形成されので、上述したようなキャップねじ部7の成形工程において、ねじ本数が3本の部分が2本の部分よりもより軸線方向に変形しやすくなる。すると、巻き締め中においては、ねじ形成ローラのキャップ押圧位置と完全ねじ部Wの始点W1との相対位置が軸線方向にずれるので、ねじ形成の不十分な箇所が生じる。また、ねじ形成時には、キャップ5の側面下端側に軸線方向上方に引き上げられる力が発生するので、ねじ本数が多いほどブリッジは切れやすくなる。したがって、ねじ3本部分が多すぎるほどブリッジ切れが発生しやすくなる。そして、巻き締め終了後においては、プレッシャーブロックが解放されると、ねじ3本部分がばねとなり、キャップを押し上げようとするので、ねじ3本側のブリッジが、2本側のブリッジより切れやすくなる。また、巻数を3巻以上とした場合、キャップの開栓トルクが上がり、かつ、開栓回転数が増えてしまい、その分だけ利用者の開栓作業に手間がかかってしまうので好ましくない。   For example, when the effective screw winding number is 2.5 to 3 turns, two screw parts and three parts are formed. Therefore, in the process of forming the cap screw part 7 as described above, The three-part portion is more easily deformed in the axial direction than the two portions. Then, during winding, the relative position between the cap pressing position of the screw forming roller and the starting point W1 of the complete screw portion W is shifted in the axial direction, so that a portion where screw formation is insufficient occurs. In addition, when the screw is formed, a force that is pulled upward in the axial direction is generated on the lower side of the side surface of the cap 5, so that the bridge becomes easier to break as the number of screws increases. Therefore, the more the number of the three screws is, the more easily the bridge breaks. After the tightening, when the pressure block is released, the three screw parts become springs and try to push up the cap, so the three screw side bridge is easier to cut than the two side bridge. . Further, when the number of turns is 3 or more, the opening torque of the cap is increased, and the opening rotation speed is increased, which is not preferable because the opening operation of the user is increased accordingly.

また、ボトルの内圧によってキャップ5にブリッジ切れが発生しなかった場合であっても、キャップ5のキャップねじ部7と天面との間隔が長いと、この間が伸長してしまい、キャップ5の密着性が低下するという問題があった。また、キャップ5のキャップねじ部7と天面との間隔が狭いと、キャップ5の被着工程においてキャップ5を押し付ける荷重に耐えられず、この間に対応する口金部2において座屈が生じてしまうという問題があった。   Even when the bridge of the cap 5 is not broken due to the internal pressure of the bottle, if the gap between the cap screw portion 7 and the top surface of the cap 5 is long, the gap is extended, and the cap 5 is closely attached. There was a problem that the performance decreased. Moreover, if the space | interval of the cap screw part 7 and the top | upper surface of the cap 5 is narrow, it cannot endure the load which presses the cap 5 in the adhesion process of the cap 5, and buckling will arise in the nozzle | cap | die part 2 corresponding in the meantime. There was a problem.

この発明は、口金部にキャップが被着されるボトル缶体の製造方法を提供する This invention provides the manufacturing method of the bottle can body by which a cap is attached to a nozzle | cap | die part .

この発明は、有底筒状に形成された金属製の缶体の開口部を縮径してなる口金部の上部外周にねじ部が設けられるとともに、前記ねじ部よりも下方にキャップ本体下部を巻き締めるための膨出部が形成され、前記口金部の先端部に外側に折り曲げられて形成されたカール部が設けられたボトル缶体の製造方法であって、前記開口部を縮径して口金部を形成した後、その口金部の開口端から所定距離分だけ再び拡径して拡径部を形成し、前記ねじ部は、前記拡径部が形成された後、ねじを形成する部分を縮径し、その縮径された部分にねじ切り加工することによって形成され、前記膨出部は、前記ねじ部を形成する際に縮径されずに残った拡径部分によって形成されることを特徴とする。According to the present invention, a screw portion is provided on the upper outer periphery of a base portion formed by reducing the diameter of an opening portion of a metal can body formed in a bottomed cylindrical shape, and a lower portion of the cap body is provided below the screw portion. A method of manufacturing a bottle can body in which a bulging portion for tightening is formed and a curled portion formed by bending outward at a tip portion of the base portion is provided, and the opening portion is reduced in diameter. After forming the base part, the diameter is expanded again by a predetermined distance from the opening end of the base part to form the enlarged diameter part, and the screw part is a part that forms a screw after the enlarged diameter part is formed And the bulging portion is formed by the enlarged diameter portion remaining without being reduced in diameter when the screw portion is formed. Features.

本発明によれば、キャップが良好に被着されるボトル缶体を製造することができる。According to the present invention, it is possible to manufacture a bottle can body in which a cap is satisfactorily attached.

この発明の一実施の形態に係るボトル缶体を示す全体図である。1 is an overall view showing a bottle can body according to an embodiment of the present invention. ボトル缶体とこれに被着されるキャップとの関係を示す説明図である。It is explanatory drawing which shows the relationship between a bottle can body and the cap adhere | attached on this. ボトル缶体にキャップを被着する説明用断面図である。It is sectional drawing for description which attaches a cap to a bottle can body. ボトル缶体にキャップが被着されボトルを示す要部拡大図である。It is a principal part enlarged view which shows a bottle by attaching a cap to a bottle can body. ボトル缶体の口金部の拡大部分断面図である。It is an expanded partial sectional view of the nozzle | cap | die part of a bottle can body. 従来のボトル缶体とキャップとを示す説明図である。It is explanatory drawing which shows the conventional bottle can body and a cap. ボトル缶体の口金部にねじ部を形成する説明図である。It is explanatory drawing which forms a thread part in the nozzle | cap | die part of a bottle can body. 有効ねじ部の説明図である。It is explanatory drawing of an effective screw part.

以下、図面を参照し、この発明の実施の形態について説明する。図1から図5はこの発明の一実施の形態に係るボトル缶体および、ボトル缶体にキャップが被着されたボトルを示す図であって、図1はボトル缶体を示す全体図、図2はボトル缶体とキャップとの関係を示す説明図、図3はボトル缶体にキャップが被着される工程の説明用断面図、図4はボトル缶体にキャップが被着されたボトルを示す要部拡大図、図5はボトル缶体の口金部の拡大部分断面図である。   Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 are diagrams showing a bottle can body according to an embodiment of the present invention and a bottle with a cap attached to the bottle can body. FIG. 1 is an overall view showing the bottle can body. 2 is an explanatory view showing the relationship between the bottle can body and the cap, FIG. 3 is a sectional view for explaining the process of attaching the cap to the bottle can body, and FIG. 4 shows the bottle with the cap attached to the bottle can body. FIG. 5 is an enlarged partial cross-sectional view of the cap portion of the bottle can body.

この実施形態のボトル缶体11は、炭酸飲料,果汁飲料などを入れるためのものであって、アルミニウム若しくはアルミニウム合金からなっており、図1のようにボトル缶体11の上部に口金部12が形成されている。   The bottle can body 11 of this embodiment is for containing carbonated drinks, fruit juice drinks, etc., and is made of aluminum or an aluminum alloy. As shown in FIG. Is formed.

口金部12の上部外周には、ねじ部13が設けられ、そのねじ部13より下方には膨出部14が形成されると共に、その下に頸部15が形成されている。ねじ部13は、ボトル缶体11に設けられた口金部12が拡径されて拡径部が形成された後、ねじを形成する部分を縮径し、その縮径された部分にねじ形成機(図示せず)がねじ切り加工することによって形成され、膨出部14は、縮径されず、さらにねじ部13がねじ切り加工されたとき、ねじ切りされていない残りの拡径部分によって形成されている(図6(d)参照)。   A screw portion 13 is provided on the outer periphery of the upper portion of the base portion 12, a bulging portion 14 is formed below the screw portion 13, and a neck portion 15 is formed therebelow. The screw portion 13 is formed by reducing the diameter of the portion where the screw is formed after the base portion 12 provided in the bottle can body 11 is expanded to form the expanded diameter portion, and a screw forming machine is formed on the reduced diameter portion. (Not shown) is formed by threading, and the bulging portion 14 is not reduced in diameter, and when the threaded portion 13 is further threaded, it is formed by the remaining diameter-expanded portion that is not threaded. (See FIG. 6D).

そして、この口金部12に、図2のように有底円筒状に形成されたキャップ材21が被せられたとき、そのキャップ材21が図3に示すキャッピング装置30によって巻締められることにより口金部12に図4のようにキャップ20が被着され、これによってキャップ20が口金部12の開口端を封止する。   And when this cap part 12 is covered with a cap material 21 formed in a bottomed cylindrical shape as shown in FIG. 2, the cap material 21 is wound by a capping device 30 shown in FIG. As shown in FIG. 4, a cap 20 is attached to 12, and the cap 20 seals the open end of the base 12.

キャップ材21は、被着される前の段階では、図2に示すようにその上部が天板22によって塞がれると共に、その下部が下方に向かい真直に開口された筒状をなしており、天板22の内側にはライナー23(図3,図4参照)が装着されている。キャップ材21の下端にはブリッジ部24を介しキャップ本体下部25が設けられている。ブリッジ部24は、複数のスコア24aと、ブリッジ24bとがキャップ材21の周方向に交互に配設されている。   In the stage before being attached, the cap material 21 has a cylindrical shape whose upper part is closed by a top plate 22 as shown in FIG. 2 and whose lower part is opened downward and straight, A liner 23 (see FIGS. 3 and 4) is attached to the inside of the top plate 22. A cap body lower portion 25 is provided at the lower end of the cap material 21 via a bridge portion 24. In the bridge portion 24, a plurality of scores 24 a and bridges 24 b are alternately arranged in the circumferential direction of the cap material 21.

この実施形態では、ボトル缶体11の口金部12に設けられるねじ部13の有効ねじ巻数が2.2巻で形成されている。即ち、ねじ部13は、口金部12に拡径部が形成されると、ねじ形成機のねじ切りローラが、拡径されて次いで縮径された部分の周囲に沿って転動し、この拡径されて次いで縮径された部分を押圧してねじ山とねじ谷とを画成することによって形成されるが、その際、口金部12において、図2及び図4のように、ねじ部13として有効に機能する開始位置13aと終了位置13bとの間の有効ねじ巻数が2.2巻となるように形成されている。   In this embodiment, the number of effective screw turns of the screw portion 13 provided in the base portion 12 of the bottle can body 11 is 2.2. That is, when the diameter-enlarged portion is formed in the base portion 12, the threaded roller of the screw forming machine rolls along the periphery of the diameter-enlarged portion and then the diameter-reduced portion. Then, the diameter-reduced portion is pressed to define a screw thread and a thread valley. At that time, in the base part 12, as shown in FIGS. The number of effective screw turns between the effectively functioning start position 13a and end position 13b is 2.2.

このねじ部13の有効ねじ部は、従来例の図6で示された有効ねじ部と同様に定義され、開始位置13a(図8では、有効ねじ始点X1)から終了位置13b(図8では、有効ねじ終点X2)までのねじ部とされている。また、口金部12の外径は、従来例の図6で示された外径Bと同様に定義される。このようなねじ部13を有するボトル缶体11は、口金部12に形成されたねじ部13の最大外径が28〜38mmで、かつ口金部12の厚さが0.25〜0.4mmの大きさであり、これに1インチ当たり8山のネジピッチで有効ねじ巻数が2.2巻のねじ部13が形成される。   The effective screw portion of the screw portion 13 is defined in the same manner as the effective screw portion shown in FIG. 6 of the conventional example, and from the start position 13a (effective screw start point X1 in FIG. 8) to the end position 13b (in FIG. 8, The threaded portion is the effective screw end point X2). Further, the outer diameter of the base 12 is defined in the same manner as the outer diameter B shown in FIG. 6 of the conventional example. In the bottle can body 11 having such a screw portion 13, the maximum outer diameter of the screw portion 13 formed on the base portion 12 is 28 to 38 mm, and the thickness of the base portion 12 is 0.25 to 0.4 mm. The thread portion 13 is formed with a thread pitch of 8 turns per inch and an effective thread winding number of 2.2.

従って、この口金部12にキャップ材21が図2のように被せられ、かつ図3のようなキャッピング装置30によってキャップ材21の外周にキャップねじ部26が形成されてキャップ20が被着されると、キャップ20にも有効ねじ巻数が2.2巻からなるねじ部が形成されるようになっている。   Therefore, the cap member 21 is put on the base portion 12 as shown in FIG. 2, and the cap screw portion 26 is formed on the outer periphery of the cap member 21 by the capping device 30 as shown in FIG. Then, the cap 20 is also formed with a screw portion having an effective screw winding number of 2.2.

また、図5に示すように、口金部12の先端部には先端が外側に折り曲げられて形成されているカール部27と、カール部27から下方に向かって拡径するように形成されている傾斜部28とが設けられている。ねじ始点W1(図8参照)は、ねじ部13の略最大外径となる点とされ、ねじ始点W1を通過する外径をねじ山外径D1とし、カール部27の最大外径部を通過する外径をカール部外径D2とする。また、ボトル缶体11の上端面29からねじ始点W1までの高さをねじ始点高さh、上端面29からカール部27の外側の最下端点T1までの高さをカール部高さTとする。   Further, as shown in FIG. 5, a curled portion 27 formed by bending the distal end outward is formed at the distal end portion of the base portion 12, and a diameter is increased downward from the curled portion 27. An inclined portion 28 is provided. The screw start point W1 (see FIG. 8) is a point where the screw portion 13 has a substantially maximum outer diameter. The outer diameter passing through the screw start point W1 is defined as a thread outer diameter D1 and passes through the maximum outer diameter portion of the curled portion 27. The outer diameter to be used is the curl outer diameter D2. Further, the height from the upper end surface 29 of the bottle can 11 to the screw start point W1 is the screw start point height h, and the height from the upper end surface 29 to the lowest end point T1 outside the curled portion 27 is the curled portion height T. To do.

傾斜部28の傾斜角θは、ねじ始点W1から口金部の上方に向かう傾斜と中心軸Oとが形成する角度で、カール部27の外側の最下端点T1からねじ始点W1までの傾斜部28の平均角度が用いられる。
傾斜角θの測定は、株式会社ミツトヨ製のコントレーサーCDH−400を用いて、前記ねじ始点W1から最下端点T1の指定区間線測定により行われた。すなわち、コントレーサーにより中心軸O方向において傾斜部28の輪郭形状を測定し、この輪郭形状より最小2乗法を用いて直線を求め、この直線と中心軸Oとの角度を傾斜角θとする測定を行ったのである。
また、上述した傾斜角θとねじ始点高さhとの間には数1に示す関係がある。
The inclination angle θ of the inclined portion 28 is an angle formed by the inclination from the screw start point W1 to the upper portion of the base portion and the central axis O, and the inclined portion 28 from the lowest end point T1 outside the curled portion 27 to the screw start point W1. Average angles are used.
The inclination angle θ was measured by a designated section line measurement from the screw starting point W1 to the lowest end point T1 using a Contraser CDH-400 manufactured by Mitutoyo Corporation. That is, the contour shape of the inclined portion 28 is measured in the direction of the central axis O by the tracer, a straight line is obtained from the contour shape using the least square method, and the angle between the straight line and the central axis O is measured as the inclination angle θ. Was done.
Further, there is a relationship expressed by Equation 1 between the above-described inclination angle θ and the screw start point height h.

Figure 0004908544
Figure 0004908544

数1より、ねじ山外径D1、カール部外径D2、およびカール部高さTを固定した時、傾斜角θを決めるとねじ始点高さhが決められ、傾斜角θを大きくするとねじ始点高さhが小さくなるということがわかる。これより、傾斜角θの下限値がねじ始点高さhの上限値となり、ねじ始点高さhの下限値が傾斜角θの上限値となることが分かる。   From Equation 1, when the thread outer diameter D1, the curled section outer diameter D2, and the curled section height T are fixed, the thread start point height h is determined by determining the tilt angle θ, and the thread start point is increased by increasing the tilt angle θ. It can be seen that the height h decreases. From this, it can be seen that the lower limit value of the inclination angle θ is the upper limit value of the screw start point height h, and the lower limit value of the screw start point height h is the upper limit value of the inclination angle θ.

キャッピング装置30は、主に図3に示すように、ボトル缶体11に被せたキャップ材21の天板22を下方に押圧するプレッシャーブロック35と、キャップ材21を外周から口金部12に押し付けると共に、口金部12のねじ部13に沿いキャップ材21の外周を巻き締めることにより、キャップねじ部26を形成するROローラ32と、キャップ材21のキャップ本体下部25を外周から膨出部14の下部に巻き付けてピルファープルーフ部を形成するPPローラ33とを備えている。   As shown mainly in FIG. 3, the capping device 30 presses the cap member 21 against the base 12 from the outer periphery, and a pressure block 35 that presses the top plate 22 of the cap member 21 that covers the bottle can body 11 downward. The RO roller 32 that forms the cap screw portion 26 and the cap body lower portion 25 of the cap material 21 are moved from the outer periphery to the lower portion of the bulging portion 14 by tightening the outer periphery of the cap material 21 along the screw portion 13 of the base portion 12. And a PP roller 33 that forms a pilfer proof portion.

なお、プレッシャーブロック35は、キャップ材21の天板22を押圧する押圧体31を備え、付勢ばね34を介してプレッシャーシャフト37に連結され、キャップ20を被着する際、口金部12に被せたキャップ材21の天板22を押圧させる押し付け荷重が、口金部12の口径の大きさに応じて変えられるようにしている。ROローラ32及びPPローラ33は、支持アーム36によりボトル缶体11及びキャップ材21の周囲に回転可能に構成されている。   The pressure block 35 includes a pressing body 31 that presses the top plate 22 of the cap material 21, and is connected to the pressure shaft 37 via the urging spring 34, and covers the base portion 12 when the cap 20 is attached. The pressing load that presses the top plate 22 of the cap material 21 can be changed according to the diameter of the base portion 12. The RO roller 32 and the PP roller 33 are configured to be rotatable around the bottle can body 11 and the cap material 21 by a support arm 36.

この実施形態のボトル缶体11は、上記のように口金部12に設けられたねじ部13の有効ねじ巻数が2.2巻で形成されており、これに、キャップ20を被着するため、図2のように有底円筒状のキャップ材21を被せた後、キャッピング装置30を駆動し、キャッピング装置30のプレッシャーブロック35が図3のようにキャップ材21をボトル缶体11の底部方向に押し付けながら、かつROローラ32がボトル缶体11のねじ部13に倣うよう口金部12の周囲に沿って回転すると、図4に示すように、キャップ材21の外周に口金部12のねじ部13に対応するキャップねじ部26が形成され、またPPローラ33によってキャップ材21のキャップ本体下部25が膨出部14に巻き締められ、これによってボトル缶体11にキャップ20が被着されることとなる。   In the bottle can body 11 of this embodiment, the effective screw winding number of the screw portion 13 provided in the base portion 12 is formed as 2.2 as described above, and in order to attach the cap 20 to this, After covering the bottomed cylindrical cap material 21 as shown in FIG. 2, the capping device 30 is driven, and the pressure block 35 of the capping device 30 moves the cap material 21 toward the bottom of the bottle can body 11 as shown in FIG. When the RO roller 32 rotates along the periphery of the base part 12 so as to follow the screw part 13 of the bottle can body 11 while being pressed, the screw part 13 of the base part 12 is placed on the outer periphery of the cap member 21 as shown in FIG. The cap screw portion 26 corresponding to the cap member 21 is formed, and the cap body lower portion 25 of the cap material 21 is wound around the bulging portion 14 by the PP roller 33, whereby the bottle can body 11 is keyed. -Up 20 is to be deposited.

上述したようなボトル缶体11およびキャップ20を用いて、耐荷重試験および漏れ試験を行った。実験は、ねじ山外径D1がφ38,φ33,φ28の3通りのボトル缶体11およびキャップ20において、傾斜角θおよびねじ始点高さhを変えて行われた。実験には、0.24〜0.4mmの板厚で、ねじ部13に1インチ当り8山のピッチのねじを有効ねじ巻が数2.2巻で形成されたボトル缶体11が用いられ、180〜230N/mmの引張強度を有し、板厚0.25mmで、ポリエチレンまたはポリプロピレンのライナー23が貼着されたキャップ20が用いられた。 Using the bottle can body 11 and the cap 20 as described above, a load resistance test and a leak test were performed. The experiment was performed by changing the inclination angle θ and the screw start point height h in the bottle can body 11 and the cap 20 having three thread outer diameters D1 of φ38, φ33, and φ28. In the experiment, a bottle can body 11 having a plate thickness of 0.24 to 0.4 mm and an effective thread winding of several threads of 8 threads per inch on the thread portion 13 is used. A cap 20 having a tensile strength of 180 to 230 N / mm 2 , a plate thickness of 0.25 mm, and having a polyethylene or polypropylene liner 23 attached thereto was used.

耐荷重試験はボトル缶体11の軸方向に荷重を増加させていき、1600N未満で座屈したボトル缶体11を不合格(×)、1600N以上で座屈したボトル缶体11を合格(○)と評価した。漏れ試験は、常温状態において内圧が0.1MPaで充填されたボトル10の重量を測定し、ボトル10を37℃の状態で1日経過させた後、常温状態で再度重量を測定して、その重量差が0.2mg以下のボトル10を合格(○)、重量差が0.2mg以上のボトル10を不合格(×)と評価した。実験結果を表1に示す。   The load resistance test increases the load in the axial direction of the bottle can body 11 and rejects the bottle can body 11 buckled at less than 1600 N (x), and passes the bottle can body 11 buckled at 1600 N or more (○ ). In the leakage test, the weight of the bottle 10 filled with an internal pressure of 0.1 MPa in the normal temperature state is measured, and after the bottle 10 is allowed to pass for one day at 37 ° C., the weight is measured again in the normal temperature state. A bottle 10 having a weight difference of 0.2 mg or less was evaluated as pass (◯), and a bottle 10 having a weight difference of 0.2 mg or more was evaluated as reject (x). The experimental results are shown in Table 1.

Figure 0004908544
Figure 0004908544

表1において、ねじ始点高さhが短くなる、つまり傾斜角θが大きくなると座屈が生じ、また、ねじ始点高さhが長くなる、つまり傾斜角θが小さくなると漏れが生じていることが分かる。これより、総合評価として座屈も漏れも生じないねじ始点高さhおよび傾斜角θの範囲を○と評価し、それ以外を×と評価した。総合評価が○と評価される範囲は、ねじ山外径D1がφ38のボトル10において、3.6mm≦h≦5.6mm、33.0°≦θ≦55.0°、ねじ山外径D1がφ33のボトル10において、3.24mm≦h≦4.74mm、32.5°≦θ≦54.6°、ねじ山外径D1がφ28のボトル10において、3.4mm≦h≦5.1mm、33.0°≦θ≦55.0°である。   In Table 1, buckling occurs when the screw start point height h is shortened, that is, when the tilt angle θ is increased, and leakage occurs when the screw start point height h is increased, that is, when the tilt angle θ is decreased. I understand. From this, as a comprehensive evaluation, the range of the screw starting point height h and the inclination angle θ where neither buckling nor leakage occurs was evaluated as “good”, and the other was evaluated as “x”. The range in which the overall evaluation is evaluated as ◯ is 3.6 mm ≦ h ≦ 5.6 mm, 33.0 ° ≦ θ ≦ 55.0 °, and the thread outer diameter D1 in the bottle 10 having a thread outer diameter D1 of φ38. In the bottle 10 having a diameter of φ33, 3.24 mm ≦ h ≦ 4.74 mm, 32.5 ° ≦ θ ≦ 54.6 °, and in the bottle 10 having a thread outer diameter D1 of φ28, 3.4 mm ≦ h ≦ 5.1 mm 33.0 ° ≦ θ ≦ 55.0 °.

上述したように本実施の形態のボトル11は、口金部12に設けられたねじ部13の有効ねじ巻数が2.2巻で形成されているので、キャップ20の被着工程においてプレッシャーブロック35の圧力によって、ねじ部13の撓みは偏ることがない。これにより、キャップ20に対する各ROローラ32の押し付け高さ位置にばらつきが生じなくなり、ねじ巻き不良を起こすことがない。また、ねじ本数が3本の部分が少ないので、キャップ20の被着時にブリッジ切れが発生しにくい。   As described above, the bottle 11 according to the present embodiment is formed with the number of effective screw turns of the screw portion 13 provided in the base portion 12 being 2.2, so that the pressure block 35 of the cap 20 is attached in the process of attaching the cap 20. The bending of the screw portion 13 is not biased by the pressure. As a result, there is no variation in the pressing height position of each RO roller 32 against the cap 20, and no screw winding failure occurs. In addition, since the number of the three screws is small, it is difficult for bridge breakage to occur when the cap 20 is attached.

一方、ボトル缶体11にキャップ20が被着されると、ボトル10内を陽圧とした場合、キャップ20にボトル缶体11の口金部12の内方から押し上げる力が作用するが、前述したように、口金部12のねじ部13とキャップねじ部26との有効ねじ巻数が2.2巻であって、ねじ部13とキャップねじ部26とが一様な力で締結されており、キャップ20がボトル缶体11に対し偏ることがなく、キャップ20のブリッジ部24が切れるおそれがない。また、開栓トルクが必要以上に上昇することもない。   On the other hand, when the cap 20 is attached to the bottle can body 11, when the inside of the bottle 10 is set to a positive pressure, a force that pushes up from the inside of the cap portion 12 of the bottle can body 11 acts on the cap 20. As described above, the effective number of turns of the screw portion 13 of the base portion 12 and the cap screw portion 26 is 2.2, and the screw portion 13 and the cap screw portion 26 are fastened with a uniform force. 20 is not biased with respect to the bottle can body 11, and there is no possibility that the bridge portion 24 of the cap 20 is cut. Further, the opening torque does not increase more than necessary.

その結果、この実施形態によれば、ボトル缶体11にキャップ20を良好に被着することができ、被着後でもキャップ20の良好な状態を確実に維持することができ、従って、ボトル缶体11のねじ部13の巻数によって発生する従来の問題点を解消することができるので、ボトル10としての信頼性を高めることができる。   As a result, according to this embodiment, the cap 20 can be satisfactorily attached to the bottle can body 11, and the good state of the cap 20 can be reliably maintained even after being attached. Since the conventional problem that occurs due to the number of turns of the screw portion 13 of the body 11 can be solved, the reliability of the bottle 10 can be improved.

また、ボトル缶体11は、ねじ始点高さhが3.24mm≦h≦5.6mmの範囲で形成されているので、規定の内圧以下においてカール部27とライナー23との間で良好な密着性が得られる。つまり、内圧によってキャップ20のキャップねじ部26と天板22との間が伸長するが、この伸長量はねじ始点高さhによって決められ、ねじ始点高さhを上記範囲にすることで漏れが発生することのない伸長量とすることができるのである。これにより、規定内圧において良好な密封性を有するボトル缶体11を形成することができる。   Further, since the bottle can body 11 is formed with a screw starting point height h in the range of 3.24 mm ≦ h ≦ 5.6 mm, it has good adhesion between the curled portion 27 and the liner 23 at a specified internal pressure or less. Sex is obtained. That is, the internal pressure extends between the cap screw portion 26 of the cap 20 and the top plate 22, but the extension amount is determined by the screw start point height h, and leakage is prevented by setting the screw start point height h within the above range. The amount of elongation that does not occur can be obtained. Thereby, the bottle can body 11 having good sealing performance at the specified internal pressure can be formed.

また、傾斜角θが33°≦θ≦55°の範囲で形成されているので、キャップ20の被着工程において、キャップ20を押し付ける荷重に耐えられる耐荷重性を得ることができる。また、有効ねじ巻数が2.0から2.5巻になるように口金部12が形成されているので、ボトル10の内圧によってずれが生じることなく、キャップ20が確実に被着されるボトル缶体11を形成することができると共に開栓トルクの上昇を抑えることができる。   Further, since the inclination angle θ is formed in the range of 33 ° ≦ θ ≦ 55 °, it is possible to obtain load resistance that can withstand the load that presses the cap 20 in the attaching process of the cap 20. Further, since the base portion 12 is formed so that the effective number of screw turns is 2.0 to 2.5, a bottle can in which the cap 20 is securely attached without causing a shift due to the internal pressure of the bottle 10. The body 11 can be formed and an increase in the opening torque can be suppressed.

なお、図示実施形態では、ボトル缶体11の口金部12に形成されるねじ部13及びキャップ20に形成されるキャップねじ部26の有効ねじ巻数が2.2巻で形成された例を示したが、少なくとも2.0巻以上で、かつ2.5巻以下の有効ねじ巻数であればよい。さらに、2.0〜2.3巻で形成されていれば、不完全ねじ部が軸方向に重ならず、ねじ成形が安定して行え、ねじ3本部分が少なくなるので、より好ましい。   In the illustrated embodiment, an example is shown in which the number of effective screw turns of the screw part 13 formed on the base part 12 of the bottle can 11 and the cap screw part 26 formed on the cap 20 is 2.2. However, it is sufficient that the number of effective screw turns is at least 2.0 or more and 2.5 or less. Furthermore, if it is formed by 2.0 to 2.3 windings, the incomplete thread portion does not overlap in the axial direction, the screw forming can be performed stably, and the three screw portions are more preferable.

従って、この発明においては、ボトル缶体11の口金部12に形成されたねじ部13の最大外径が28〜38mmで、かつその厚さが0.25〜0.4mmで、かつ有効ねじの巻数が2.0〜2.5巻で、好ましくは2.2〜2.3巻で形成されていれば、上述した作用効果を発揮することができる。   Accordingly, in the present invention, the maximum outer diameter of the screw portion 13 formed on the base portion 12 of the bottle can body 11 is 28 to 38 mm, the thickness thereof is 0.25 to 0.4 mm, and the effective screw. If the number of turns is 2.0 to 2.5, preferably 2.2 to 2.3, the above-described effects can be exhibited.

10 ボトル
11 ボトル缶体
12 口金部
13 ねじ部
13a ねじ部の有効な開始位置
13b ねじ部の有効な終了位置
14 膨出部
20 キャップ
21 キャップ材
22 天板
23 ライナー
24 ブリッジ部
25 キャップ本体下部
26 キャップねじ部
30 キャッピング装置
35 プレッシャーブロック
32 ROローラ
33 PPローラ
DESCRIPTION OF SYMBOLS 10 Bottle 11 Bottle can body 12 Cap part 13 Screw part 13a Effective start position of screw part 13b Effective end position of screw part 14 Inflated part 20 Cap 21 Cap material 22 Top plate 23 Liner 24 Bridge part 25 Cap main body lower part 26 Cap screw part 30 Capping device 35 Pressure block 32 RO roller 33 PP roller

Claims (1)

有底筒状に形成された金属製の缶体の開口部を縮径してなる口金部の上部外周にねじ部が設けられるとともに、前記ねじ部よりも下方にキャップ本体下部を巻き締めるための膨出部が形成され、前記口金部の先端部に外側に折り曲げられて形成されたカール部が設けられたボトル缶体の製造方法であって、  A screw portion is provided on the outer periphery of the upper portion of the base portion formed by reducing the diameter of the opening of the metal can body formed in a bottomed cylindrical shape, and for tightening the lower portion of the cap body below the screw portion. A bulging portion is formed, and a manufacturing method of a bottle can body provided with a curled portion formed by bending outward at a tip portion of the base portion,
前記開口部を縮径して口金部を形成した後、その口金部の開口端から所定距離分だけ再び拡径して拡径部を形成し、  After forming the base part by reducing the diameter of the opening, the diameter is expanded again by a predetermined distance from the opening end of the base part to form an enlarged part,
前記ねじ部は、前記拡径部が形成された後、ねじを形成する部分を縮径し、その縮径された部分にねじ切り加工することによって形成され、  The threaded portion is formed by reducing the diameter of the portion where the screw is formed after the enlarged diameter portion is formed, and threading the reduced diameter portion,
前記膨出部は、前記ねじ部を形成する際に縮径されずに残った拡径部分によって形成されることを特徴とするボトル缶体の製造方法。  The method of manufacturing a bottle can body, wherein the bulging portion is formed by an enlarged diameter portion that remains without being reduced in diameter when the screw portion is formed.
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JP2018100121A (en) * 2016-12-21 2018-06-28 ユニバーサル製缶株式会社 Cap body, bottle can body with cap

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