JP2018103254A - Bottle can, capped bottle can, and manufacturing method for the same - Google Patents

Bottle can, capped bottle can, and manufacturing method for the same Download PDF

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Publication number
JP2018103254A
JP2018103254A JP2016255546A JP2016255546A JP2018103254A JP 2018103254 A JP2018103254 A JP 2018103254A JP 2016255546 A JP2016255546 A JP 2016255546A JP 2016255546 A JP2016255546 A JP 2016255546A JP 2018103254 A JP2018103254 A JP 2018103254A
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Japan
Prior art keywords
bottle
end side
cap
axis
region
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JP2016255546A
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Japanese (ja)
Inventor
加奈子 永澤
Kanako Nagasawa
加奈子 永澤
英泰 武藤
Hideyasu Muto
英泰 武藤
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Altemira Can Co Ltd
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Universal Can Corp
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Application filed by Universal Can Corp filed Critical Universal Can Corp
Priority to JP2016255546A priority Critical patent/JP2018103254A/en
Priority to CN201710153309.8A priority patent/CN108248979A/en
Priority to KR1020170032200A priority patent/KR20180076990A/en
Publication of JP2018103254A publication Critical patent/JP2018103254A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
    • B67B—APPLYING CLOSURE MEMBERS TO BOTTLES JARS, OR SIMILAR CONTAINERS; OPENING CLOSED CONTAINERS
    • B67B3/00—Closing bottles, jars or similar containers by applying caps
    • B67B3/02—Closing bottles, jars or similar containers by applying caps by applying flanged caps, e.g. crown caps, and securing by deformation of flanges
    • B67B3/10—Capping heads for securing caps
    • B67B3/18—Capping heads for securing caps characterised by being rotatable, e.g. for forming screw threads in situ
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
    • B65D1/02—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents
    • B65D1/0223—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents characterised by shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
    • B21D35/002—Processes combined with methods covered by groups B21D1/00 - B21D31/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D51/00—Making hollow objects
    • B21D51/16—Making hollow objects characterised by the use of the objects
    • B21D51/18—Making hollow objects characterised by the use of the objects vessels, e.g. tubs, vats, tanks, sinks, or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
    • B65D1/12—Cans, casks, barrels, or drums
    • B65D1/14—Cans, casks, barrels, or drums characterised by shape
    • B65D1/16—Cans, casks, barrels, or drums characterised by shape of curved cross-section, e.g. cylindrical
    • B65D1/165—Cylindrical cans
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D7/00—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of metal
    • B65D7/02—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of metal characterised by shape
    • B65D7/04—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of metal characterised by shape of curved cross-section, e.g. cans of circular or elliptical cross-section
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D7/00—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of metal
    • B65D7/42—Details of metal walls

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Closures For Containers (AREA)
  • Sealing Of Jars (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a bottle can capable of surely preventing the mouthpiece from buckling upon applying a load in parallel with a can axis when the cap is mounted, a capped bottle can, and a manufacturing method for the same.SOLUTION: A bottle can comprises a shoulder keeping the diameter reduced toward the upper end side from the body of a bottomed cylindrical can body centered on the can axis, a neck extending from the shoulder toward the upper end side, and a mouthpiece having a male screw formed on the upper end side of the neck and a curl formed on the upper end side of the male screw, where the curl has a bend region so bent as to fold the upper end of the can body to the outer peripheral side and a flat region extending from the bent region toward the lower end side almost in parallel with the can axis, the outer surface of the bent region is 150 μm or more and 250 μm or less in a length parallel with the can axis from an apex on the upper end side of this bent region to a boundary with the flat region.SELECTED DRAWING: Figure 2

Description

本発明は、口金部にカール部が形成されたボトル缶、およびこのボトル缶にキャップが取り付けられたキャップ付きボトル缶、およびその製造方法に関するものである。   The present invention relates to a bottle can in which a curl portion is formed in a base portion, a bottle can with a cap in which a cap is attached to the bottle can, and a method for manufacturing the same.

ボトル缶は、口金部において、先端部分が外周方向に折り返されたカール部が形成されている。こうしたカール部は、缶本体の上端部を外周側に折り返すように屈曲させた屈曲領域と、この屈曲領域から缶軸に対して略平行に下端側に向けて延びる平坦領域とを有している。   The bottle can has a curl portion in which the tip portion is folded back in the outer peripheral direction in the base portion. Such a curled portion has a bent region where the upper end portion of the can body is bent so as to be folded back to the outer peripheral side, and a flat region extending from the bent region toward the lower end side substantially parallel to the can axis. .

こうしたボトル缶にキャップを取り付けてキャップ付きボトル缶を製造する際には、内側にシール材を配した有底筒状のキャップ材をボトル缶の口金部に被せ、キャップ材の天板の周縁に対して缶軸に平行に荷重を印加して段差部を形成する（キャッピング）。これによって、ボトル缶のカール部がシール材に密着し、ボトル缶が液密に保たれる。この後、キャップ材の周壁の外面に回転工具を押し付けて、口金部に形成されている雄ネジ部の形状に倣った雌ネジ部をキャップ材に形成することで、キャップ付きボトル缶を製造する（特許文献１を参照）。
近年、こうしたボトル缶は、軽量化および製造コスト低減のため、缶体の肉厚を薄くする薄肉化が望まれている。 When manufacturing a bottle can with a cap by attaching a cap to such a bottle can, the bottomed cylindrical cap material with a sealing material on the inside is put on the base of the bottle can, and it is placed on the periphery of the top plate of the cap material. On the other hand, a step is formed by applying a load parallel to the can axis (capping). As a result, the curl portion of the bottle can adheres to the sealing material, and the bottle can is kept liquid-tight. Thereafter, the rotating tool is pressed against the outer surface of the peripheral wall of the cap material, and the cap threaded bottle can is manufactured by forming the female thread portion in accordance with the shape of the male thread portion formed in the cap portion on the cap material. (See Patent Document 1).
In recent years, in order to reduce the weight and the manufacturing cost of such bottle cans, it has been desired to reduce the thickness of the can body.

特開２０１６−１３７９１５号公報Japanese Patent Laid-Open No. 2006-137915

しかしながら、軽量化および製造コスト低減のためにボトル缶の缶体の肉厚を薄くすると、上述したキャップ材に段差部を形成する工程において、缶軸に平行に荷重を印加した際に、薄肉化による強度不足によって、カール部が座屈しやすくなるという課題があった。一方、こうした座屈を防止するために、キャップ材に段差部を形成する工程において、缶軸に平行に印加する荷重を低減すると、カール部とシール材との密着性が低下して、ボトル缶に収容された液体が漏出する懸念がある。   However, if the thickness of the can body of the bottle can is reduced for weight reduction and manufacturing cost reduction, the thickness is reduced when a load is applied parallel to the can axis in the step of forming the stepped portion in the cap material described above. There was a problem that the curled portion was likely to buckle due to insufficient strength. On the other hand, in order to prevent such buckling, if the load applied in parallel to the can axis is reduced in the step of forming the stepped portion in the cap material, the adhesion between the curled portion and the sealing material is reduced, and the bottle can There is a concern that the liquid contained in the tank may leak.

本発明は、このような背景の下になされたもので、キャップ取付時に缶軸に平行に荷重を印加した際に、口金部が座屈することを確実に防止することが可能なボトル缶、キャップ付きボトル缶、およびその製造方法を提供することを目的としている。   The present invention has been made under such a background. A bottle can and cap that can reliably prevent the base from buckling when a load is applied parallel to the can axis when the cap is attached. It is an object of the present invention to provide an attached bottle can and a manufacturing method thereof.

上記課題を解決して、このような目的を達成するために、本発明のボトル缶は、缶軸を中心とする有底筒状の缶本体の胴部から上端側に向かうに従い縮径する肩部と、該肩部から上端側に向かって延びる首部と、該首部の上端側に形成された雄ネジ部および該雄ネジ部の上端側に形成されたカール部を有する口金部と、を備えたボトル缶であって、前記カール部は、前記雄ネジ部に連なり、前記缶本体の上端部を外周側に折り返すように屈曲させた屈曲領域と、該屈曲領域から前記缶軸に対して略平行に下端側に向けて延びる平坦領域と、を有し、前記屈曲領域の外面は、この屈曲領域の上端側の頂部から前記平坦領域との境界までの前記缶軸に平行な長さが１５０μｍ以上、２５０μｍ以下であることを特徴とする。   In order to solve the above-mentioned problems and achieve such an object, the bottle can of the present invention has a shoulder whose diameter is reduced from the body part of the bottomed cylindrical can body centering on the can axis toward the upper end side. A neck portion extending from the shoulder portion toward the upper end side, a male screw portion formed on the upper end side of the neck portion, and a base portion having a curl portion formed on the upper end side of the male screw portion. The curled portion is connected to the male screw portion, and is bent so that the upper end portion of the can body is folded back to the outer peripheral side; A flat region extending in parallel toward the lower end side, and the outer surface of the bent region has a length parallel to the can axis from the top of the upper end side of the bent region to the boundary with the flat region is 150 μm. As described above, it is 250 μm or less.

シール部材をカール部に密着させて密封性を高めるためには、平坦領域において、シール部材に対して密着している長さ（サイドシール長さ：ＳＳＬ）が重要とされている。こうしたＳＳＬを長くすることで、例えば、ボトル缶の内部を陽圧にした場合に、キャップが持ち上げられることにより、平坦領域とシール部材との密着性が高められる。   In order to improve the sealing performance by bringing the sealing member into close contact with the curled portion, the length (side seal length: SSL) that is in close contact with the sealing member in the flat region is important. By lengthening such SSL, for example, when the inside of the bottle can is set to a positive pressure, the cap is lifted, whereby the adhesion between the flat region and the seal member is enhanced.

本発明のボトル缶は、カール部の頂部から平坦領域との境界までの缶軸に平行な長さを１５０μｍ以上にすることで、カール部の屈曲領域と平坦領域との境界の位置を適切に保ち、こうした境界が上方に上がりすぎることによって生じるシール部材の破断を防止することができる。   In the bottle can of the present invention, by setting the length parallel to the can axis from the top of the curled part to the boundary with the flat region to be 150 μm or more, the position of the boundary between the bent region and the flat region of the curled part is appropriately set. It is possible to prevent the breakage of the sealing member caused by such a boundary being raised upwards.

また、本発明のボトル缶は、カール部の頂部から平坦領域との境界までの缶軸に平行な長さを２５０μｍ以下にすることで、ボトル缶のカール部における屈曲領域と平坦領域との境界の位置を適切に保ち、平坦領域において、シール部材に対して密着している長さを長くすることができ、シール部材のカール部への密着性を高く保ち、カール部の密封性を高めることができる。   The bottle can of the present invention has a boundary between the bent region and the flat region in the curled portion of the bottle can by making the length parallel to the can axis from the top of the curled portion to the boundary with the flat region not more than 250 μm. The position of the seal member can be appropriately maintained, and the length of the seal member can be increased in a flat region, and the adhesion of the seal member to the curled portion can be kept high and the sealing performance of the curled portion can be improved. Can do.

また、平坦領域の缶軸に平行な長さを長くすることができるため、キャッピング時に印加する軸荷重（トルク）を小さくすることができ、少ない軸荷重トルクでキャップによる封止を行うことができ、ボトル缶の口金部の座屈を確実に防止することができる。   In addition, since the length parallel to the can axis in the flat region can be increased, the axial load (torque) applied during capping can be reduced, and sealing with a cap can be performed with a small axial load torque. The buckling of the mouthpiece of the bottle can can be reliably prevented.

また、本発明のボトル缶は、前記屈曲領域と前記平坦領域との境界は、前記平坦領域の上端側において、前記屈曲領域の曲率半径の１０倍以上の曲率半径で屈曲が始まる部分との交点であることを特徴とする。   Further, in the bottle can of the present invention, the boundary between the bent region and the flat region is an intersection with a portion where bending starts at a curvature radius of 10 times or more of the curvature radius of the bent region on the upper end side of the flat region. It is characterized by being.

本発明のキャップ付きボトル缶は、前記各項記載のボトル缶と、前記カール部を覆う天板部および前記雄ネジ部を覆い、かつ雄ネジ部に螺合する雌ネジ部が形成された周壁部を有する有底筒状のキャップと、該キャップの内面側に形成され、前記カール部の前記屈曲領域および前記平坦領域に密着するシール部材と、を備えたことを特徴とする。   A bottle can with a cap according to the present invention is a peripheral wall in which the bottle can described in the above-mentioned items, a top plate portion covering the curl portion, and the male screw portion are formed and a female screw portion is formed to be screwed into the male screw portion. And a sealing member formed on the inner surface side of the cap and in close contact with the bent region and the flat region of the curled portion.

本発明のキャップ付きボトル缶の製造方法は、前項記載のキャップ付きボトル缶の製造方法であって、前記ボトル缶に、天板および周壁を有する有底筒状のキャップ材を前記口金部に被せ、前記天板の周縁に前記缶軸に平行に荷重を印加し、段差部を備えた前記天板部を形成する段差部形成工程と、前記周壁の外面に回転工具を押し付けて、前記雄ネジ部の形状に倣った雌ネジ部を備えた周壁部を形成する雌ネジ部形成工程と、を有し、前記段差部形成工程では、前記缶軸に平行な方向に印加される荷重を９００Ｎ以下にすることを特徴とする。   The method for producing a bottle can with a cap according to the present invention is a method for producing a bottle can with a cap according to the preceding paragraph, wherein the bottle can is covered with a bottomed cylindrical cap material having a top plate and a peripheral wall. Applying a load to the periphery of the top plate in parallel to the can axis to form a step portion forming step for forming the top plate portion with a step portion; and pressing the rotary tool against the outer surface of the peripheral wall, An internal thread portion forming step of forming a peripheral wall portion having an internal thread portion following the shape of the portion, and in the stepped portion forming step, a load applied in a direction parallel to the can shaft is 900 N or less It is characterized by.

本発明によれば、キャップ取付時に缶軸に平行に荷重を印加した際に、口金部が座屈することを確実に防止することが可能なボトル缶、キャップ付きボトル缶、およびその製造方法を提供することができる。   According to the present invention, there are provided a bottle can, a bottle can with a cap, and a method for manufacturing the same that can reliably prevent the base from buckling when a load is applied in parallel to the can axis when the cap is attached. can do.

本発明のボトル缶の一実施形態を示す一部破断側面図である。It is a partially broken side view showing one embodiment of the bottle can of the present invention. 本発明のボトル缶の口金部に形成されたカール部を示す要部拡大断面図である。It is a principal part expanded sectional view which shows the curl part formed in the nozzle | cap | die part of the bottle can of this invention. 従来のボトル缶の口金部に形成されたカール部を示す要部拡大断面図である。It is a principal part expanded sectional view which shows the curl part formed in the nozzle | cap | die part of the conventional bottle can. 本発明の一実施形態であるキャップ付きボトル缶の口金部を示す要部拡大断面図である。It is a principal part expanded sectional view which shows the nozzle | cap | die part of the bottle can with a cap which is one Embodiment of this invention. 図４のカール部とその近傍を示す要部拡大断面図である。It is a principal part expanded sectional view which shows the curl part of FIG. 4, and its vicinity.

以下、図面を参照して、本発明の一実施形態のボトル缶、キャップ付きボトル缶、およびその製造方法について説明する。なお、以下に示す実施形態は、発明の趣旨をより良く理解させるために具体的に説明するものであり、特に指定のない限り、本発明を限定するものではない。また、以下の説明で用いる図面は、本発明の特徴をわかりやすくするために、便宜上、要部となる部分を拡大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と同じであるとは限らない。   Hereinafter, a bottle can, a bottle can with a cap, and a manufacturing method thereof according to an embodiment of the present invention will be described with reference to the drawings. The following embodiments are specifically described for better understanding of the gist of the invention, and do not limit the present invention unless otherwise specified. In addition, in the drawings used in the following description, in order to make the features of the present invention easier to understand, there is a case where a main part is shown in an enlarged manner for convenience, and the dimensional ratio of each component is the same as the actual one. Not necessarily.

図１は、本発明の一実施形態のボトル缶を示す一部破断側面図である。
本実施形態のボトル缶１は、底部２と、この底部２と一体に形成されて底部２の外周縁から上端側（図１において上側）に延びる外周部３とを備えた缶軸Ｃを中心とする概略多段の有底円筒状を成す缶本体１１を有する。 FIG. 1 is a partially broken side view showing a bottle can according to an embodiment of the present invention.
The bottle can 1 of the present embodiment is centered on a can shaft C having a bottom portion 2 and an outer peripheral portion 3 formed integrally with the bottom portion 2 and extending from the outer peripheral edge of the bottom portion 2 to the upper end side (upper side in FIG. 1). It has the can main body 11 which consists of a substantially multistage bottomed cylindrical shape.

底部２には、缶軸Ｃ方向の内側（缶本体１１の上端側）に凹む断面略円弧状のドーム部２ａが中央に形成されるとともに、このドーム部２ａの外周には缶軸Ｃ方向の外側（缶本体１１の下端側）に突出する環状凸部２ｂが缶軸Ｃ回りの周方向に連続して形成されている。   A dome portion 2a having a substantially arc-shaped cross-section that is recessed inward in the can axis C direction (upper end side of the can body 11) is formed in the bottom 2 at the center, and the outer periphery of the dome portion 2a is in the can axis C direction. An annular convex portion 2b that protrudes outward (the lower end side of the can body 11) is formed continuously in the circumferential direction around the can axis C.

また、外周部３には底部２から缶本体１１の上端側の開口部４に向けて順に、缶軸Ｃを中心とした円筒状の胴部５と、上端側に向かうに従い一定の傾斜で漸次縮径する円錐台面状の肩部６と、この肩部６からさらに上端側に向かって延びる筒状の首部７と、首部７の上端から外周側に張り出す膨出部８と、雄ネジ部９と、カール部１０とが形成されている。
なお、首部７よりも上側の膨出部８、雄ネジ部９、カール部１０を含む部分が口金部１２を構成している。 In addition, the outer peripheral portion 3 has a cylindrical body portion 5 centering on the can axis C in order from the bottom portion 2 to the opening portion 4 on the upper end side of the can body 11, and gradually with a certain inclination toward the upper end side. A frustoconical shoulder 6 having a reduced diameter, a cylindrical neck 7 extending further from the shoulder 6 toward the upper end, a bulging portion 8 projecting from the upper end of the neck 7 to the outer peripheral side, and a male screw portion 9 and a curled portion 10 are formed.
A portion including the bulging portion 8, the male screw portion 9, and the curled portion 10 above the neck portion 7 constitutes the base portion 12.

このようなボトル缶を製造するには、まずカッピングプレス機によるカッピングプレス工程においてアルミニウムまたはアルミニウム合金等の金属板を円板状に打ち抜いて絞り加工を施すことにより深さの浅いカップ状素材を製造する。次いで、このカップ状素材にＤＩプレス機によるＤＩプレス工程において再絞りおよびしごき加工を施して缶軸Ｃ方向に延伸することにより、底部２に上記ドーム部２ａと環状凸部２ｂが形成された有底円筒体（ＤＩ缶）を成形する。   In order to manufacture such a bottle can, first, a cup-shaped material with a shallow depth is manufactured by punching a metal plate such as aluminum or aluminum alloy into a disk shape and performing a drawing process in a cupping press process by a cupping press machine. To do. Next, the cup-shaped material is subjected to redrawing and ironing in a DI press process by a DI press machine and stretched in the direction of the can axis C, whereby the dome portion 2a and the annular convex portion 2b are formed on the bottom portion 2. A bottom cylinder (DI can) is formed.

カッピングプレス工程においてカップ状素材に成形される金属板は、本実施形態では元板厚が０．２８５ｍｍ〜０．３００ｍｍのＪＩＳ Ｈ ４０００におけるＡ３００４またはＡ３１０４のアルミニウム合金板であって、２０５℃×２０分ベーキング後の０．２％耐力が２３５Ｎ／ｍｍ２〜２６５Ｎ／ｍｍ２の範囲のものが用いられる。 In this embodiment, the metal plate formed into a cup-shaped material in the cupping press process is an aluminum alloy plate of A3004 or A3104 in JIS H 4000 having a base plate thickness of 0.285 mm to 0.300 mm, and is 205 ° C. × 20. A 0.2% proof stress after minute baking is in the range of 235 N / mm 2 to 265 N / mm 2 .

また、このカップ状素材から成形される有底円筒体には、外周部に上記缶軸Ｃを中心とした円筒部が形成され、この円筒部の外径は缶本体１１の胴部５の外径と略等しい一定外径である。   Further, the bottomed cylindrical body formed from the cup-shaped material has a cylindrical portion centered on the can axis C on the outer peripheral portion, and the outer diameter of the cylindrical portion is outside the body portion 5 of the can body 11. A constant outer diameter substantially equal to the diameter.

このように成形された有底円筒体は、第１の洗浄工程において洗浄、乾燥され、次いで塗装工程において内外面に塗装が施されて焼き付けられる。そして、塗装が施された有底円筒体は、ボトルネッカーによるボトルネック成形工程において、円筒部の上記上端側部分の下端側が金型によって縮径されて上記肩部６と首部７が成形される。   The bottomed cylindrical body formed in this way is cleaned and dried in the first cleaning step, and then the inner and outer surfaces are painted and baked in the coating step. In the bottled neck forming step by the bottle necker, the bottomed cylindrical body that has been coated is reduced in diameter by the mold at the lower end side of the upper end side portion of the cylindrical portion, and the shoulder portion 6 and the neck portion 7 are formed. .

次いで首部７の上端側が拡径工具によって拡径されて上記膨出部８が形成されるとともに、この膨出部８よりもさらに上端側にねじ切り加工が施されて上記雄ネジ部９が形成される。次いで、雄ネジ部９よりも上端側が外周側に折り返されてカールされてからスロットル加工によって潰されてカール部１０が形成され、図１に示したようなボトル缶の缶本体１１に成形される。   Next, the upper end side of the neck portion 7 is expanded by a diameter expanding tool to form the bulging portion 8, and the threading process is further performed on the upper end side of the bulging portion 8 to form the male screw portion 9. The Next, the upper end side of the male screw portion 9 is folded back and curled, and then crushed by throttle processing to form a curled portion 10, which is formed into a can body 11 of a bottle can as shown in FIG. .

こうして成形された缶本体１１は、第２の洗浄工程によって洗浄、乾燥された後に、検査工程においてピンホールの有無や外面の異物付着、傷、汚れ、印刷不良等が検査されて飲料工場等に搬送され、飲料等の内容物が充填された後に、図４に示すように開口部４を覆ってカール部１０から雄ネジ部９および膨出部８にかけてキャップ１１が取り付けられて封止され、出荷される。なお、缶本体１１の記各工程の間や各工程中には、有底円筒体の上端縁を切断するトリミングや、必要に応じて底部の環状凸部２ｂの断面形状を再成形するボトムリフォームが行われる。   After the can body 11 thus molded is cleaned and dried in the second cleaning process, the inspection process is inspected for the presence of pinholes, adhesion of foreign matters on the outer surface, scratches, dirt, printing defects, etc. After being transported and filled with contents such as beverages, a cap 11 is attached and sealed from the curled portion 10 to the male screw portion 9 and the bulging portion 8 so as to cover the opening 4 as shown in FIG. Shipped. In addition, during each process of the can main body 11 or during each process, trimming that cuts the upper edge of the bottomed cylindrical body, or bottom reform that reshapes the cross-sectional shape of the bottom annular projection 2b as necessary Is done.

図２は、ボトル缶の口金部に形成されたカール部を示す要部拡大断面図である。
図２に示すように、カール部１０は、雄ネジ部９（図１を参照）に連なり、缶本体１１の上端部を外周側に折り返すように屈曲させた屈曲領域１０Ａと、この屈曲領域１０Ａから缶軸Ｃ（図１を参照）に対して略平行に、缶本体１１の下端側（図１において下側）に向けて延びる平坦領域１０Ｂとを有している。 FIG. 2 is an enlarged cross-sectional view of a main part showing a curled part formed in a base part of a bottle can.
As shown in FIG. 2, the curled portion 10 is connected to the male screw portion 9 (see FIG. 1) and is bent so that the upper end portion of the can body 11 is bent back to the outer peripheral side, and the bent region 10A. And a flat region 10B extending toward the lower end side (lower side in FIG. 1) of the can body 11 substantially in parallel to the can axis C (see FIG. 1).

こうしたカール部１０の屈曲領域１０Ａの外面は、その頂部Ｔ１から平坦領域１０Ｂとの境界（缶本体１１の外面における屈曲領域１０Ａと平坦領域１０Ｂとの境界）Ｅ１までの缶軸Ｃに平行な長さが１５０μｍ以上、２５０μｍ以下となるように形成されている。   The outer surface of the bent region 10A of the curled portion 10 is a length parallel to the can axis C from the top T1 to the boundary between the flat region 10B (the boundary between the bent region 10A and the flat region 10B on the outer surface of the can body 11) E1. Is formed to be 150 μm or more and 250 μm or less.

例えば、カール部１０の屈曲領域１０Ａと平坦領域１０Ｂとの境界Ｅ１は、平坦領域１０Ｂの外面の上端側において、屈曲領域１０Ａの外面を成す円Ｒ１の曲率半径ｒ１の１０倍以上の曲率半径で屈曲が始まる部分との交点とされている。図２のＲ２に示す円弧は、円Ｒ１の１０倍の曲率半径の円の一部を示している。平坦領域１０Ｂの断面形状は、屈曲領域１０Ａの曲率半径の１０倍以上の曲率半径のほぼ直線に近い円弧や、缶軸Ｃに平行な直線、あるいはこれら両方で構成された、缶軸Ｃに略平行な領域である。   For example, the boundary E1 between the bent region 10A and the flat region 10B of the curled portion 10 has a radius of curvature that is 10 times or more of the radius of curvature r1 of the circle R1 that forms the outer surface of the bent region 10A on the upper end side of the outer surface of the flat region 10B. It is considered as the intersection with the part where bending begins. The arc indicated by R2 in FIG. 2 indicates a part of a circle having a radius of curvature 10 times that of the circle R1. The cross-sectional shape of the flat region 10B is substantially the same as that of the can axis C, which is composed of an arc that is almost a straight line with a radius of curvature of 10 times or more of the radius of curvature of the bent region 10A, a straight line parallel to the can axis C, or both. It is a parallel region.

一例として、図２に示すカール部１０は、屈曲領域１０Ａの外面の曲率半径ｒ１＝０．５４ｍｍである。そして、屈曲領域１０Ａの外面の頂部Ｔ１から、屈曲領域１０Ａと平坦領域１０Ｂとの外面における境界Ｅ１までの缶軸Ｃに平行な長さＬ１＝２００μｍである。   As an example, the curled portion 10 shown in FIG. 2 has a curvature radius r1 = 0.54 mm of the outer surface of the bent region 10A. A length L1 parallel to the can axis C from the top T1 of the outer surface of the bent region 10A to the boundary E1 on the outer surface of the bent region 10A and the flat region 10B is 200 μm.

一方、図３に示す、缶本体の肉厚が本実施形態よりも厚い従来のボトル缶１００におけるカール部１０１は、屈曲領域１０１Ａの外面の曲率半径ｒ２＝０．６５ｍｍである。そして、屈曲領域１０１Ａの外面の頂部Ｔ２から、屈曲領域１０１Ａと平坦領域１０１Ｂとの外面における境界Ｅ２までの缶軸Ｃに平行な長さＬ２＝３２０μｍである。   On the other hand, the curled portion 101 in the conventional bottle can 100 shown in FIG. 3 in which the wall thickness of the can body is thicker than that of the present embodiment has a curvature radius r2 = 0.65 mm of the outer surface of the bent region 101A. A length L2 parallel to the can axis C from the top T2 of the outer surface of the bent region 101A to the boundary E2 on the outer surface of the bent region 101A and the flat region 101B is 320 μm.

このように、本実施形態のボトル缶１は、カール部１０における屈曲領域１０Ａと平坦領域１０Ｂとの境界Ｅ１の位置が、従来のボトル缶１００の境界Ｅ２の位置と比較して、上端側に上がっており、その分だけ、平坦領域１０Ｂの缶軸Ｃに平行な長さが長くなっている。こうした平坦領域１０Ｂの缶軸Ｃに平行な長さを長くすることで、後述するシール部材との密着性が高められる。   Thus, in the bottle can 1 of the present embodiment, the position of the boundary E1 between the bent region 10A and the flat region 10B in the curled portion 10 is closer to the upper end side than the position of the boundary E2 of the conventional bottle can 100. The length of the flat region 10B parallel to the can axis C is increased accordingly. By increasing the length of the flat region 10B parallel to the can axis C, adhesion to a seal member described later can be improved.

図４は、本発明の一実施形態であるキャップ付きボトル缶の口金部を示す要部拡大断面図である。また、図５は、図４のカール部とその近傍を示す要部拡大断面図である。
本発明の一実施形態であるキャップ付きボトル缶２０は、図１、２に示したボトル缶１と、このボトル缶１の口金部１２に係着されたキャップ２１とからなる。 FIG. 4 is an enlarged cross-sectional view showing a main part of a cap portion of a bottle can with a cap according to an embodiment of the present invention. FIG. 5 is an enlarged cross-sectional view of the main part showing the curled part of FIG. 4 and the vicinity thereof.
A bottle can 20 with a cap according to an embodiment of the present invention includes the bottle can 1 shown in FIGS. 1 and 2 and a cap 21 attached to a base portion 12 of the bottle can 1.

キャップ２１は、缶本体１１のカール部１０を覆う天板部２２と、雄ネジ部９を覆う周壁部２３とが一体に形成されてなる。周壁部２３には、雄ネジ部９に螺合する雌ネジ部２４が形成されている。こうした缶本体１１に形成された雄ネジ部９と、キャップ２１に形成された雌ネジ部２４によって、キャップ２１の開栓後も、キャップの再開閉（リシール）が自在にされる。   The cap 21 is formed by integrally forming a top plate portion 22 that covers the curled portion 10 of the can body 11 and a peripheral wall portion 23 that covers the male screw portion 9. The peripheral wall portion 23 is formed with a female screw portion 24 that is screwed into the male screw portion 9. By such a male screw portion 9 formed on the can body 11 and a female screw portion 24 formed on the cap 21, the cap can be opened and closed (resealed) even after the cap 21 is opened.

天板部２２の周縁には、段差部２５が形成されている。また、キャップ２１の内面２１ａとカール部１０との間には、シール部材（シーリングライナー）２６が挟持されている。このシール部材２６は、ボトル缶１の内部に飲料等の液体を収容して、口金部１２をキャップ２１で覆った際に、カール部１０とキャップ２１の内面２１ａとの隙間を塞ぎ、液体の漏出を防止する。   A step portion 25 is formed on the periphery of the top plate portion 22. A seal member (sealing liner) 26 is sandwiched between the inner surface 21 a of the cap 21 and the curled portion 10. The seal member 26 accommodates a liquid such as a beverage inside the bottle can 1, and closes the gap between the curled portion 10 and the inner surface 21 a of the cap 21 when the base portion 12 is covered with the cap 21. Prevent leakage.

段差部２５は、キャッピング装置のプレッシャーブロックによって天板部２２が押圧されることで形成される。これにより、カール部１０を構成する屈曲領域１０Ａから平坦領域１０Ｂに渡ってシール部材２６が密着する。   The step portion 25 is formed by pressing the top plate portion 22 by the pressure block of the capping device. As a result, the seal member 26 comes into close contact with the flat region 10B from the bent region 10A constituting the curled portion 10.

シール部材をカール部に密着させて密封性を高めるためには、平坦領域１０Ｂにおいて、シール部材２６に対して密着している長さ（サイドシール長さ：ＳＳＬ）が重要とされている。こうしたＳＳＬを長くすることで、例えば、ボトル缶１の内部を陽圧にした場合に、キャップ２１が持ち上げられることにより、平坦領域１０Ｂとシール部材２６との密着性が高められる。   In order to improve the sealing performance by bringing the sealing member into close contact with the curled portion, the length (side seal length: SSL) that is in close contact with the sealing member 26 in the flat region 10B is important. By lengthening such SSL, for example, when the inside of the bottle can 1 is set to a positive pressure, the cap 21 is lifted, whereby the adhesion between the flat region 10B and the seal member 26 is enhanced.

本発明の一実施形態であるキャップ付きボトル缶２０では、ボトル缶１のカール部１０の頂部Ｔ１から屈曲領域１０Ａと平坦領域１０Ｂとの境界Ｅ１までの缶軸Ｃに平行な長さを１５０μｍ以上にすることで、屈曲領域１０Ａと平坦領域との境界の位置を適切に保ち、こうした境界が上方に上がりすぎることによって生じるシール部材の破断を防止してカール部１０への密着性を高く保つことができる。   In the bottle can 20 with a cap that is one embodiment of the present invention, the length parallel to the can axis C from the top T1 of the curled portion 10 of the bottle can 1 to the boundary E1 between the bent region 10A and the flat region 10B is 150 μm or more. By doing so, the position of the boundary between the bent region 10A and the flat region is appropriately maintained, and the seal member is prevented from being broken when the boundary is excessively raised, so that the adhesion to the curled portion 10 is kept high. Can do.

また、キャップ付きボトル缶２０は、ボトル缶１のカール部１０の頂部Ｔ１から屈曲領域１０Ａと平坦領域１０Ｂとの境界Ｅ１までの缶軸Ｃに平行な長さを２５０μｍ以下にすることで、ボトル缶１のカール部１０における屈曲領域１０Ａと平坦領域１０Ｂとの境界Ｅ１の位置を、従来のボトル缶よりも上端側に上げることができる。これにより、シール部材２６が安定して接することができる平坦領域１０Ｂの缶軸Ｃに平行な長さを長くすることができ、シール部材２６のカール部１０への密着性を高く保つことができる。   In addition, the bottle can 20 with the cap has a length parallel to the can axis C from the top portion T1 of the curled portion 10 of the bottle can 1 to the boundary E1 between the bent region 10A and the flat region 10B, which is 250 μm or less. The position of the boundary E1 between the bent region 10A and the flat region 10B in the curled portion 10 of the can 1 can be raised to the upper end side than the conventional bottle can. Thereby, the length parallel to the can axis | shaft C of the flat area | region 10B with which the sealing member 26 can contact | connect stably can be lengthened, and the adhesiveness to the curl part 10 of the sealing member 26 can be kept high. .

本発明の一実施形態のキャップ付きボトル缶の製造方法として、キャップ２１をボトル缶１の缶本体１１に取り付ける際には、缶本体１１と同じくアルミニウムまたはアルミニウム合金からなる円板状の天板と円筒状の周壁とを一体に備えた有底円筒状のキャップ素材が、その開口部を下向きにして缶本体１の開口部４を塞ぐようにカール部１０から雄ネジ部９および膨出部８にかけて被せられる。なお、天板の内面側には、予めシール部材２６が配置されている。   As a method for manufacturing a bottle can with a cap according to an embodiment of the present invention, when the cap 21 is attached to the can body 11 of the bottle can 1, a disk-shaped top plate made of aluminum or an aluminum alloy is used, as is the case with the can body 11. A bottomed cylindrical cap material integrally provided with a cylindrical peripheral wall extends from the curled portion 10 to the male screw portion 9 and the bulging portion 8 so as to close the opening portion 4 of the can body 1 with the opening portion facing downward. It is put over. A seal member 26 is disposed in advance on the inner surface side of the top plate.

そして、例えば、キャッピング装置のプレッシャーブロックによってキャップ素材の天板がカール部１０に押圧されて絞り成形され、天板の周縁に段差部２５を形成する。こうして、段差部２５を有する天板部２２が得られる（段差部形成工程）。こうした段差部形成工程によって、予め天板の内面側に配されたシール部材２６が、カール部１０の屈曲領域１０Ａから平坦領域１０Ｂにかけて密着する。この時、プレッシャーブロックによる缶軸に平行な方向に印加される荷重は、９００Ｎ以下に設定される。   Then, for example, the top plate of the cap material is pressed against the curled portion 10 by the pressure block of the capping device and is drawn to form a step portion 25 on the periphery of the top plate. Thus, the top plate portion 22 having the step portion 25 is obtained (step portion forming step). By such a stepped portion forming step, the seal member 26 previously disposed on the inner surface side of the top plate is in close contact with the curled portion 10 from the bent region 10A to the flat region 10B. At this time, the load applied in the direction parallel to the can axis by the pressure block is set to 900 N or less.

従来の段差部形成工程におけるプレッシャーブロックによる荷重は、１０００Ｎ以上であったが、本発明のキャップ付きボトル缶の製造方法では、プレッシャーブロックによる缶軸に平行な方向に印加される荷重を、従来よりも低い９００Ｎ以下にすることによって、ボトル缶１の口金部１２の座屈を確実に防止することができる。   The load due to the pressure block in the conventional stepped portion forming step was 1000 N or more. However, in the method for manufacturing a bottle can with a cap according to the present invention, the load applied in the direction parallel to the can axis by the pressure block is conventionally increased. By setting it to 900 N or less which is also low, buckling of the cap part 12 of the bottle can 1 can be reliably prevented.

一方で、段差部形成工程におけるプレッシャーブロックによる荷重を低くすることにより、カール部に対するシール部材の密着力が低下する懸念があるが、本発明のキャップ付きボトル缶２０では、ボトル缶１のカール部１０の頂部Ｔ１から屈曲領域１０Ａと平坦領域１０Ｂとの境界Ｅ１までの缶軸Ｃに平行な長さを２５０μｍ以下にすることで、ボトル缶１のカール部１０における屈曲領域１０Ａと平坦領域１０Ｂとの境界Ｅ１の位置を、従来のボトル缶よりも上端側に上げることができる。
これによって、ボトル缶２０のカール部１０における屈曲領域１０Ａと平坦領域１０Ｂとの境界の位置を適切に保ち、平坦領域１０Ｂにおいて、シール部材２６に対して密着している長さを長くすることができ、カール部の密封性を高めることができる。これにより例えば、プレッシャーブロックによる缶軸に平行な方向に印加される荷重を従来よりも低い９００Ｎ以下にしても、シール部材２６のカール部１０への密着性が低下することがない。 On the other hand, there is a concern that the adhesion force of the sealing member to the curled portion may be reduced by reducing the load due to the pressure block in the step portion forming step. However, in the bottle can 20 with a cap of the present invention, the curled portion of the bottle can 1 is used. The length parallel to the can axis C from the top T1 of 10 to the boundary E1 between the bent region 10A and the flat region 10B is 250 μm or less, whereby the bent region 10A and the flat region 10B in the curled part 10 of the bottle can 1 are The position of the boundary E1 can be raised to the upper end side of the conventional bottle can.
Thereby, the position of the boundary between the bent region 10A and the flat region 10B in the curled portion 10 of the bottle can 20 is appropriately maintained, and the length in close contact with the seal member 26 in the flat region 10B can be increased. And the sealing property of the curled portion can be improved. Thereby, for example, even if the load applied in the direction parallel to the can axis by the pressure block is 900 N or less which is lower than the conventional one, the adhesion of the sealing member 26 to the curled portion 10 does not deteriorate.

こうした段差部形成工程とともに、ネジ加工ロールなどの回転工具が周壁に押し付けられて雄ネジ部９に倣うようにネジ加工が施されることにより内周に雌ネジ部２４が形成されるとともに、裾巻きロールによって周壁の下端縁が膨出部８に巻締め加工された周壁部２３が形成される（雌ネジ部形成工程）。
以上の工程を経て、本発明の一実施形態のキャップ付きボトル缶２０が製造される。 Along with such a stepped portion forming step, a rotating tool such as a screw processing roll is pressed against the peripheral wall and is subjected to screw processing so as to follow the male screw portion 9, whereby a female screw portion 24 is formed on the inner periphery and A peripheral wall portion 23 in which the lower end edge of the peripheral wall is wound around the bulging portion 8 by the winding roll is formed (internal thread portion forming step).
Through the above steps, a bottle can 20 with a cap according to an embodiment of the present invention is manufactured.

以上、本発明の実施形態を説明したが、これらの実施形態は、例として提示したものであり、発明の範囲を限定することは意図していない。これら実施形態は、その他の様々な形態で実施されることが可能であり、発明の要旨を逸脱しない範囲で、種々の省略、置き換え、変更を行うことができる。これらの実施形態やその変形例は、発明の範囲や要旨に含まれると同様に、特許請求の範囲に記載された発明とその均等の範囲に含まれるものである。   As mentioned above, although embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the invention described in the claims and equivalents thereof in the same manner as included in the scope and gist of the invention.

以下、本発明の効果を検証した検証例を述べる。
表１に示す条件の実施例（本発明例）１，２、および比較例（従来例）１，２，３について、落下漏れ試験、およびリシールトルク試験を行った。
表１において、Ｗ（μｍ）は、缶本体のカール部における板厚である。また、Ｌ（μｍ）は、屈曲領域の外面の頂部から、屈曲領域と平坦領域との外面における境界までの缶軸に平行な長さである。また、ＴＰ（Ｎ）は、段差部形成工程におけるプレッシャーブロックによる荷重である。更に、ＳＳＬ（ｍｍ）は、肩絞り加工で変形したシール部材（ライナー）の外周部が口金部の外側に密着する長さである。 Hereinafter, verification examples for verifying the effects of the present invention will be described.
A drop leak test and a reseal torque test were conducted on Examples (present invention examples) 1 and 2 and Comparative Examples (conventional examples) 1, 2 and 3 under the conditions shown in Table 1.
In Table 1, W (μm) is the plate thickness at the curled portion of the can body. L (μm) is a length parallel to the can axis from the top of the outer surface of the bent region to the boundary at the outer surface of the bent region and the flat region. TP (N) is a load due to the pressure block in the step portion forming process. Furthermore, SSL (mm) is a length in which the outer peripheral portion of the seal member (liner) deformed by shoulder drawing is in close contact with the outside of the base portion.

（落下漏れ試験）
評価缶数をそれぞれ１０缶とした。レトルト処理後１日放置したキャップ付きボトル缶を、３０ｃｍの高さから１０°傾斜した鉄板上に倒立（垂直）姿勢で落下させた後、正置にして１日放置する。落下前後の内圧を測定し、３０ｋＰａ以上低下した場合を漏れが発生したと判定し、１缶でも漏れが発生した場合を不合格「×」とし、漏れが発生しなかった場合を合格「○」とした。 (Fall leak test)
The number of evaluation cans was 10 cans. A bottle with a cap that has been allowed to stand for 1 day after the retort treatment is dropped in an inverted (vertical) posture on an iron plate tilted by 10 ° from a height of 30 cm, and then placed in an upright position and left for 1 day. Measure the internal pressure before and after the drop, and determine that a leak has occurred when the pressure has dropped by 30 kPa or more. It was.

（リシールトルク）
評価缶数をそれぞれ１０缶とした。キャップ付きボトル缶を一度開栓した後、元の位置よりも手前に３０°まで戻してリシールしたときに要した最大トルクを測定し、その最大トルクが１０Ｎ・ｃｍ以上の缶が１缶でもある場合を不合格「×」とし、１０缶すべて最大トルクが１０Ｎ・ｃｍ未満であった場合を合格「○」とした。 (Reseal torque)
The number of evaluation cans was 10 cans. After opening the bottle can with cap once, the maximum torque required when resealing by returning to 30 ° before the original position is measured, and there is one can whose maximum torque is 10 N · cm or more The case was determined as “NG”, and the case where the maximum torque of all 10 cans was less than 10 N · cm was determined as “PASS”.

Figure 2018103254
Figure 2018103254

表１に示す結果によれば、Ｌを１５０μｍ以上、２５０μｍ以下、ＴＰを９００Ｎ以下にすることによって、落下漏れ試験およびリシールトルクの両方において、良好な結果が得られた。
一方、ＴＰを１０００Ｎとした比較例１では、口金部のうち、雄ネジ部が座屈し、リシールに必要なトルクが大きくなり過ぎていた。また、Ｌを３２４にした比較例２では、ＳＳＬが短くなり過ぎて、シール部材の密着性が不十分となり液漏れが生じた。更に、Ｌを１２０にした比較例３では、カール部が鋭角に近くなり、シール部材が切断されて密着性が不十分となり液漏れが生じた。 According to the results shown in Table 1, by setting L to 150 μm or more and 250 μm or less and TP to 900 N or less, good results were obtained in both the drop leak test and reseal torque.
On the other hand, in Comparative Example 1 in which TP was 1000 N, the male screw portion of the base portion was buckled, and the torque necessary for resealing was too large. Further, in Comparative Example 2 in which L was set to 324, SSL was too short, and the adhesion of the seal member was insufficient, resulting in liquid leakage. Furthermore, in Comparative Example 3 in which L was set to 120, the curled portion was close to an acute angle, the seal member was cut, the adhesion was insufficient, and liquid leakage occurred.

１ ボトル缶
９ 雄ネジ部
１０ カール部
１０Ａ 屈曲領域
１０Ｂ 平坦領域
１２ 口金部
２１ キャップ
２２ 天板部
２３ 周壁部
Ｃ 缶軸 DESCRIPTION OF SYMBOLS 1 Bottle can 9 Male thread part 10 Curled part 10A Bending area 10B Flat area 12 Cap part 21 Cap 22 Top plate part 23 Peripheral wall part C Can axis

Claims (4)

缶軸を中心とする有底筒状の缶本体の胴部から上端側に向かうに従い縮径する肩部と、該肩部から上端側に向かって延びる首部と、該首部の上端側に形成された雄ネジ部および該雄ネジ部の上端側に形成されたカール部を有する口金部と、を備えたボトル缶であって、
前記カール部は、前記雄ネジ部に連なり、前記缶本体の上端部を外周側に折り返すように屈曲させた屈曲領域と、該屈曲領域から前記缶軸に対して略平行に下端側に向けて延びる平坦領域と、を有し、
前記屈曲領域の外面は、この屈曲領域の上端側の頂部から前記平坦領域との境界までの前記缶軸に平行な長さが１５０μｍ以上、２５０μｍ以下であることを特徴とするボトル缶。 It is formed on the upper end side of the neck part, the shoulder part which is diameter-reduced as it goes from the trunk part of the bottomed cylindrical can body centering on the can axis toward the upper end side, the neck part extending from the shoulder part toward the upper end side. A bottle can comprising a male screw part and a cap part having a curl part formed on the upper end side of the male screw part,
The curled portion is connected to the male screw portion and is bent so that the upper end portion of the can body is folded back to the outer peripheral side, and the bent portion is directed substantially toward the lower end side substantially parallel to the can axis. An extending flat region,
The bottle can characterized in that the outer surface of the bent region has a length parallel to the can axis from the top on the upper end side of the bent region to the boundary with the flat region is 150 μm or more and 250 μm or less. 前記屈曲領域と前記平坦領域との境界は、前記平坦領域の上端側において、前記屈曲領域の曲率半径の１０倍以上の曲率半径で屈曲が始まる部分との交点であることを特徴とする請求項１記載のボトル缶。   The boundary between the bent region and the flat region is an intersection with an upper end side of the flat region and a portion where bending starts at a curvature radius of 10 times or more of the curvature radius of the bent region. 1. The bottle can according to 1. 請求項１または２に記載のボトル缶と、前記カール部を覆う天板部および前記雄ネジ部を覆い雄ネジ部に螺合する雌ネジ部が形成された周壁部を有する有底筒状のキャップと、該キャップの内面側に形成され、前記カール部の前記屈曲領域および前記平坦領域に密着するシール部材と、を備えたことを特徴とするキャップ付きボトル缶。   A bottomed cylindrical shape having a bottle can according to claim 1 or 2, and a peripheral wall portion formed with a top plate portion covering the curled portion and a female screw portion covering the male screw portion and screwing into the male screw portion. A bottle can with a cap, comprising: a cap; and a seal member formed on an inner surface side of the cap and in close contact with the bent region and the flat region of the curled portion. 請求項３記載のキャップ付きボトル缶の製造方法であって、
前記ボトル缶に、天板および周壁を有する有底筒状のキャップ材を前記口金部に被せ、前記天板の周縁に前記缶軸に平行に荷重を印加し、段差部を備えた前記天板部を形成する段差部形成工程と、前記周壁の外面に回転工具を押し付けて、前記雄ネジ部の形状に倣った雌ネジ部を備えた周壁部を形成する雌ネジ部形成工程と、を有し、
前記段差部形成工程では、前記缶軸に平行な方向に印加される荷重を９００Ｎ以下にすることを特徴とするキャップ付きボトル缶の製造方法。 It is a manufacturing method of the bottle can with a cap according to claim 3,
The top plate provided with a stepped portion by applying a bottomed cylindrical cap material having a top plate and a peripheral wall to the bottle can on the base portion, applying a load in parallel to the can axis to the periphery of the top plate A step portion forming step for forming a portion and a female screw portion forming step for forming a peripheral wall portion having a female screw portion following the shape of the male screw portion by pressing a rotary tool against the outer surface of the peripheral wall. And
In the step portion forming step, a load applied in a direction parallel to the can axis is set to 900 N or less.
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