WO2020054259A1 - Synthetic resin cap - Google Patents
Synthetic resin cap Download PDFInfo
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- WO2020054259A1 WO2020054259A1 PCT/JP2019/030818 JP2019030818W WO2020054259A1 WO 2020054259 A1 WO2020054259 A1 WO 2020054259A1 JP 2019030818 W JP2019030818 W JP 2019030818W WO 2020054259 A1 WO2020054259 A1 WO 2020054259A1
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- WIPO (PCT)
- Prior art keywords
- peripheral surface
- synthetic resin
- top wall
- container mouth
- cap
- Prior art date
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Classifications
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- 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
- B65D41/00—Caps, e.g. crown caps or crown seals, i.e. members having parts arranged for engagement with the external periphery of a neck or wall defining a pouring opening or discharge aperture; Protective cap-like covers for closure members, e.g. decorative covers of metal foil or paper
- B65D41/02—Caps or cap-like covers without lines of weakness, tearing strips, tags, or like opening or removal devices
- B65D41/04—Threaded or like caps or cap-like covers secured by rotation
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- 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
- B65D41/00—Caps, e.g. crown caps or crown seals, i.e. members having parts arranged for engagement with the external periphery of a neck or wall defining a pouring opening or discharge aperture; Protective cap-like covers for closure members, e.g. decorative covers of metal foil or paper
- B65D41/32—Caps or cap-like covers with lines of weakness, tearing-strips, tags, or like opening or removal devices, e.g. to facilitate formation of pouring openings
- B65D41/34—Threaded or like caps or cap-like covers provided with tamper elements formed in, or attached to, the closure skirt
Definitions
- the present invention relates to a synthetic resin cap to be attached to a mouth of a container for storing contents such as beverages.
- a conventional synthetic resin cap including a cap body having a top wall (top plate portion) and a skirt wall (skirt-like side wall) descended from the periphery thereof, and a middle foot that is in close contact with the inner surface of the container opening on the inner surface of the top wall.
- An inner ring and an outer foot (outer ring) that is in close contact with the outer surface of the container opening are known (Patent Document 1).
- the middle foot and the outer foot are in close contact with the inner and outer surfaces of the container mouth, and the hermeticity of the inside of the container is ensured.
- the present invention has been made in view of the above-mentioned matters, and an object of the present invention is to provide a synthetic resin cap which is effective in preventing cracks and, as a result, capable of improving sealing performance.
- a synthetic resin cap includes a top wall, a skirt wall extending downward from an outer peripheral portion of the top wall, and having a female screw screwed into a male screw of a container opening.
- an annular middle foot that closely adheres to the inner peripheral surface of the container mouth
- an annular outer foot that closely adheres to the outer peripheral surface of the container mouth are integrally formed.
- the inner peripheral surface of the skirt wall is bent from the upper side, and is turned back to be connected to the outer peripheral surface of the outer foot, an inclined portion whose inner diameter is larger toward the bottom, A constant straight portion, and the inclined portion has a larger vertical width than the folded portion (claim 1).
- the inner peripheral surface of the outer foot may increase in diameter toward a lower side, and its gradient may be 10 ° or more.
- a synthetic resin cap that is effective in preventing cracking and that can enhance sealing performance can be obtained.
- the thickness of the portion of the skirt wall connected to the outer leg is increased, so that the occurrence of cracks when stress is applied is effectively prevented. be able to.
- the second aspect of the present invention it is easy to improve the sealing performance by increasing the thickness of the vicinity of the base of the outer foot.
- FIG. 1 is a bottom view schematically showing a configuration of a synthetic resin cap according to one embodiment of the present invention
- (B) is a sectional view taken along line AA of (A).
- FIG. 2 is a sectional view taken along line BB of FIG. (A)-(C) is an explanatory view showing a comparison between the conventional example and the synthetic resin cap of the present invention.
- the synthetic resin cap (hereinafter referred to as cap) 1 shown in FIGS. 1A and 1B and FIG. 2 is used by being attached to a mouth M of a container such as a PET bottle (see FIG. 2). And are integrally formed of polyethylene by compression molding or injection molding.
- the material for forming the cap 1 is not particularly limited.
- polypropylene or the like is preferably used.
- the cap 1 includes a top wall 2 having a substantially circular shape in a plan view, and a substantially cylindrical skirt wall 3 extending downward from an outer peripheral portion of the top wall 2. have.
- a knurl groove 4 is provided on the outer peripheral surface of the skirt wall 3, and a female screw 5 is provided on the inner peripheral surface.
- the female screw 5 is connected to a male screw M1 (see FIG. 2) formed on the outer periphery of the container mouth. (Screwing) is possible.
- annular ring provided on the inner surface (lower surface) of the top wall 2 is formed.
- the middle foot (inner ring) 6, the annular rib 7, and the annular outer foot (outer ring) 8 are in close contact with the container opening M, whereby the container opening is sealed (see FIG. 3). That is, as shown by the phantom line in FIG. 2, when the cap 1 is attached to the container mouth M, the middle foot 6 is inserted into the container mouth M and closely adheres to the inner peripheral surface of the container mouth M.
- the annular rib 7 is configured to be in close contact with the annular upper end surface of the container opening M
- the outer leg 8 is configured to be in close contact with the outer peripheral surface of the container opening M.
- the cap 1 is a pill fur proof cap having a function to prove that the cap 1 has not been opened (the cap has never been opened).
- the cap 1 is rotated so that the connection between the male screw M1 and the female screw 5 is released at the time of opening, the cap 1 is detached from the container mouth M, but the tamper evidence connected to the lower part of the skirt wall 3 is obtained.
- the band (hereinafter, simply referred to as “band”) 9 is configured to remain at the container opening M.
- a band 9 is connected to the lower part of the skirt wall 3 via an annular weakening portion 10 extending over the entire circumference of the skirt wall 3 (see FIG. 3), and the annular weakening portion 10 is connected to the skirt wall 3 and the band 9.
- a slit 10b extending in the circumferential direction of the skirt wall 3 and the band 9 so as to vertically define the skirt wall 3 and the band 9, and the bridge 10a
- a portion (outer peripheral portion) of the bridge 10a is also cut by the slit 10b such that the bridge 10a is broken when pulled by a predetermined force.
- a plurality (eight in this example) of locking pieces (flaps) 11 protruding inward are provided on the inner peripheral side of the band 9 at intervals in the circumferential direction (see FIGS. 1 and 2). ).
- Each locking piece 11 is positioned substantially below the annular projection (bead portion) M2 formed below the male screw M1 on the outer periphery of the container mouth M when the cap 1 is attached to the container mouth M. Then, it is locked to the annular projection M2 by the opening operation (see FIG. 3). That is, the locking piece 11 is configured to be lockable from below on the annular projection M2, and the cap main body (the skirt wall 3 and the top wall 2) above the annular weakening portion 10 is opened at the time of opening.
- the band 9 detached from the M and located below the annular weakened portion 10 remains in the container mouth M, and the annular weakened portion 10 is broken accordingly.
- the band 9 is integrally formed with the cap body (the skirt wall 3 and the top wall 2), and the locking pieces 11 provided on the band 9 are in a state of protruding upward as shown in FIG.
- the inner peripheral surface of the skirt wall 3 is bent from the upper side to bend and connected to the outer peripheral surface of the outer foot 8, And a straight portion 14 having a constant inner diameter.
- the inclined portion 13 has a larger vertical width than the folded portion 12. Specifically, it is conceivable to provide the folded portion 12 so that the vertical width is 0.05 mm to 0.3 mm, and the inclined portion 13 is 0.5 mm to 2.0 mm.
- the outer peripheral surface of the outer foot 8 is bent from the upper side to have a folded portion 15 connected to the inner peripheral surface of the skirt wall 3, and a slope whose inner diameter becomes smaller toward the lower side.
- the folded portion 12 of the skirt wall 3 and the folded portion 15 of the outer foot 8 are configured to be located on the same circumference in a longitudinal sectional view, and the radius of curvature of the folded portion 12 is It is smaller than the radius of curvature of the inclined portion 13 in a vertical sectional view.
- the radii of curvature of the folded portions 12 and 15 in the vertical cross section are 0.1 mm
- the radii of curvature of the inclined portions 13 in the vertical cross section are 3 mm.
- FIG. 3C shows a main part of the cap 1 of the present embodiment, and a broken line in this figure indicates the skirt wall 3 of FIG. 3B.
- the folded portion 50 extending from the skirt wall 3 to the outer foot 8 is curved so as to be located on the same circumference in a longitudinal sectional view. Since the inclined portion 13 is not provided, the radius of curvature of the folded portion 50 is increased, and the thickness of the portion of the skirt wall 3 connected to the outer leg 8 is reduced accordingly.
- the folded portions 12, 15 from the skirt wall 3 to the outer foot 8 have the same circumference in a longitudinal sectional view as shown in FIG.
- the area occupied by the folded portions 12 and 15 is reduced, and the skirt wall 3 is made thicker by the amount of the inclined portion 13 provided between the straight portion 14 and the folded portion 12.
- the inner peripheral surface of the outer leg 8 expands in diameter toward the lower side, and its gradient ⁇ (see the enlarged view in FIG. 2) is 10 ° or more, preferably 12 ° to 16 °.
- ⁇ is 10 ° or more, preferably 12 ° to 16 °.
- this improvement in the sealing performance is achieved by increasing the thickness of the portion of the top wall 2 located on the outer peripheral side of the inner peripheral side of the middle foot 6 (particularly, the portion of the top wall 2 between the middle foot 6 and the outer foot 8). It is also enhanced by doing.
- the vertical cross-sectional shape of the inclined portion 13 is an arc shape.
- the shape may be inclined. That is, the inclined portion 13 is not located in the same circumferential shape as the folded portions 12 and 15 in the vertical cross section, and has a gentler gradient than the folded portion 12 and extends downward over a wider range than the folded portion 12. The diameter should just be expanded.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Closures For Containers (AREA)
Abstract
This invention provides a synthetic resin cap that is effective at preventing cracking and makes it possible to improve sealing performance. A synthetic resin cap 1 comprises a top wall 2, and a skirt wall 3 extending downward from an outer peripheral section of the top wall and having an internal thread 5 where an external thread M1 of a container mouth M is threaded, the cap including an annular middle leg 6 in close contact with an inner peripheral surface of the container mouth and an annular outside leg 8 in close contact with an outer peripheral surface of the container mouth that are integrally formed on a lower surface of the top wall, wherein: the inner peripheral surface of the skirt wall includes a folded section 12 that is curved from the upper side and leads to an outer peripheral surface of the outside leg, an inclined section 13 where the inner diameter increases downward, and a straight section 14 that has a constant inner diameter; and the inclined section has a greater upper/lower width than the folded section.
Description
本発明は、例えば、飲料物等の内容物を収容する容器の口部に装着される合成樹脂製キャップに関する。
(4) The present invention relates to a synthetic resin cap to be attached to a mouth of a container for storing contents such as beverages.
従来の合成樹脂製キャップとして、天壁（頂板部）とその周縁から降下したスカート壁（スカート状側壁）とを有するキャップ本体を備え、天壁内面に、容器口部の内面に密着する中足（インナーリング）と、容器口部の外面に密着する外足（アウターリング）とが形成されたものが知られている（特許文献１）。
A conventional synthetic resin cap including a cap body having a top wall (top plate portion) and a skirt wall (skirt-like side wall) descended from the periphery thereof, and a middle foot that is in close contact with the inner surface of the container opening on the inner surface of the top wall. An inner ring and an outer foot (outer ring) that is in close contact with the outer surface of the container opening are known (Patent Document 1).
斯かるキャップでは、容器口部の内外面に中足及び外足が密着し、容器内部の密封性が確保されることになる。
In such a cap, the middle foot and the outer foot are in close contact with the inner and outer surfaces of the container mouth, and the hermeticity of the inside of the container is ensured.
しかし、上記従来のキャップでは、図３（Ａ）に示すように、キャップ本体の内面においてスカート壁の上端から外足の付け根にかけて延びる折り返し部５０の縦断面視が比較的角張っているため、応力が集中して割れが生じ易いという問題がある。なお、こうした割れは、容器の密封性の低下に繋がることにもなる。
However, in the above-mentioned conventional cap, as shown in FIG. 3A, since the folded section 50 extending from the upper end of the skirt wall to the base of the outer foot on the inner surface of the cap body is relatively square, the stress is increased. However, there is a problem that cracks tend to occur due to concentration. In addition, such a crack also leads to a decrease in the sealing performance of the container.
そこで、図３（Ｂ）に示すように、上記折り返し部５０の縦断面視を一定の曲率半径を持つ円弧状とすることも考えられるが、特にスカート壁の薄肉化を図った場合に、割れ防止の点で対策が不十分となる恐れがある。
Therefore, as shown in FIG. 3 (B), it is conceivable to make the vertical cross section of the folded portion 50 into an arc shape having a constant radius of curvature, but in particular, when the skirt wall is made thinner, cracks occur. Countermeasures may be insufficient in terms of prevention.
本発明は上述の事柄に留意してなされたもので、その目的は、割れ防止に有効であり、ひいては密封性を高めることが可能な合成樹脂製キャップを提供することにある。
The present invention has been made in view of the above-mentioned matters, and an object of the present invention is to provide a synthetic resin cap which is effective in preventing cracks and, as a result, capable of improving sealing performance.
上記目的を達成するために、本発明に係る合成樹脂製キャップは、天壁と、この天壁の外周部から下方に向かって延び、容器口部の雄ねじに螺合する雌ねじを有するスカート壁とを備え、前記天壁の下面には、前記容器口部の内周面に密着する環状の中足と、前記容器口部の外周面に密着する環状の外足とを一体的に形成してある合成樹脂製キャップであって、前記スカート壁の内周面は、上側から、湾曲して前記外足の外周面に繋がる折り返し部と、下側ほど内径が大となる傾斜部と、内径が一定のストレート部とを有し、前記傾斜部は前記折り返し部よりも上下幅が大となっている（請求項１）。
In order to achieve the above object, a synthetic resin cap according to the present invention includes a top wall, a skirt wall extending downward from an outer peripheral portion of the top wall, and having a female screw screwed into a male screw of a container opening. On the lower surface of the top wall, an annular middle foot that closely adheres to the inner peripheral surface of the container mouth, and an annular outer foot that closely adheres to the outer peripheral surface of the container mouth are integrally formed. In a certain cap made of synthetic resin, the inner peripheral surface of the skirt wall is bent from the upper side, and is turned back to be connected to the outer peripheral surface of the outer foot, an inclined portion whose inner diameter is larger toward the bottom, A constant straight portion, and the inclined portion has a larger vertical width than the folded portion (claim 1).
上記合成樹脂製キャップにおいて、前記外足の内周面は下側に向かって拡径し、その勾配が１０°以上であってもよい（請求項２）。
In the above-mentioned synthetic resin cap, the inner peripheral surface of the outer foot may increase in diameter toward a lower side, and its gradient may be 10 ° or more.
本願発明では、割れ防止に有効であり、ひいては密封性を高めることが可能な合成樹脂製キャップが得られる。
According to the present invention, a synthetic resin cap that is effective in preventing cracking and that can enhance sealing performance can be obtained.
すなわち、本願の各請求項に係る発明の合成樹脂製キャップでは、スカート壁において外足に連なる部分の肉厚が大きくなるのでストレス（応力）が掛かった際における割れの発生を効果的に防止することができる。
That is, in the synthetic resin cap of the invention according to each claim of the present application, the thickness of the portion of the skirt wall connected to the outer leg is increased, so that the occurrence of cracks when stress is applied is effectively prevented. be able to.
請求項２に係る発明の合成樹脂製キャップでは、外足の付け根付近を肉厚にして密封性の向上を図ることが容易となる。
According to the second aspect of the present invention, it is easy to improve the sealing performance by increasing the thickness of the vicinity of the base of the outer foot.
本発明の実施の形態について図面を参照しながら以下に説明する。
Embodiments of the present invention will be described below with reference to the drawings.
図１（Ａ）及び（Ｂ）、図２に示す合成樹脂製キャップ（以下、キャップという）１は、例えばペットボトル等の容器の口部Ｍ（図２参照）に装着されて使用されるものであり、コンプレッション成形又はインジェクション成形によって、ポリエチレンで一体的に成形されている。なお、キャップ１を形成する素材は、特に限定されるものではなく、本実施形態で用いたポリエチレンの他、ポリプロピレン等が好適に用いられる。
The synthetic resin cap (hereinafter referred to as cap) 1 shown in FIGS. 1A and 1B and FIG. 2 is used by being attached to a mouth M of a container such as a PET bottle (see FIG. 2). And are integrally formed of polyethylene by compression molding or injection molding. In addition, the material for forming the cap 1 is not particularly limited. In addition to the polyethylene used in the present embodiment, polypropylene or the like is preferably used.
また、図１（Ａ）及び（Ｂ）に示すように、キャップ１は、平面視において略円形状の天壁２と、この天壁２の外周部から下向きに延びる略円筒状のスカート壁３を有している。ここで、スカート壁３の外周面にはローレット溝４を、内周面には雌ねじ５を設けてあり、この雌ねじ５は容器口部の外周に形成された雄ねじＭ１（図２参照）に結合（螺合）可能である。
As shown in FIGS. 1A and 1B, the cap 1 includes a top wall 2 having a substantially circular shape in a plan view, and a substantially cylindrical skirt wall 3 extending downward from an outer peripheral portion of the top wall 2. have. Here, a knurl groove 4 is provided on the outer peripheral surface of the skirt wall 3, and a female screw 5 is provided on the inner peripheral surface. The female screw 5 is connected to a male screw M1 (see FIG. 2) formed on the outer periphery of the container mouth. (Screwing) is possible.
そして、容器口部Ｍの雄ねじＭ１にスカート壁３の雌ねじ５が結合するようにキャップ１を回転させて容器口部Ｍに装着すると、天壁２の内面（下面）に連設された環状の中足（インナーリング）６、環状リブ７及び環状の外足（アウターリング）８が容器口部Ｍに密着し、これにより、容器口部が密封された状態となる（図３参照）。すなわち、図２に仮想線で示すように、キャップ１が容器口部Ｍに装着された状態では、中足６は容器口部Ｍ内に差し込まれて容器口部Ｍの内周面に密着し、環状リブ７は容器口部Ｍの環状の上端面に密着し、外足８は容器口部Ｍの外周面に密着するように構成されている。
Then, when the cap 1 is rotated and attached to the container mouth M so that the female screw 5 of the skirt wall 3 is coupled to the male screw M1 of the container mouth M, an annular ring provided on the inner surface (lower surface) of the top wall 2 is formed. The middle foot (inner ring) 6, the annular rib 7, and the annular outer foot (outer ring) 8 are in close contact with the container opening M, whereby the container opening is sealed (see FIG. 3). That is, as shown by the phantom line in FIG. 2, when the cap 1 is attached to the container mouth M, the middle foot 6 is inserted into the container mouth M and closely adheres to the inner peripheral surface of the container mouth M. The annular rib 7 is configured to be in close contact with the annular upper end surface of the container opening M, and the outer leg 8 is configured to be in close contact with the outer peripheral surface of the container opening M.
また、キャップ１は、未開封（開栓が一度もされていないこと）を証明する機能を有するピルファープルーフキャップであり、容器口部Ｍに装着された未開封のキャップ１の開封時（最初の開栓時）に、雄ねじＭ１と雌ねじ５の結合が解除されるようにキャップ１を回転させると、キャップ１は容器口部Ｍから離脱するが、スカート壁３の下部に連結されたタンパーエビデンスバンド（以下、単に「バンド」という）９は容器口部Ｍに残留するように構成されている。
The cap 1 is a pill fur proof cap having a function to prove that the cap 1 has not been opened (the cap has never been opened). When the cap 1 is rotated so that the connection between the male screw M1 and the female screw 5 is released at the time of opening, the cap 1 is detached from the container mouth M, but the tamper evidence connected to the lower part of the skirt wall 3 is obtained. The band (hereinafter, simply referred to as “band”) 9 is configured to remain at the container opening M.
すなわち、スカート壁３の下部には、スカート壁３の全周にわたって延びる環状弱化部１０を介してバンド９を連結してあり（図３参照）、環状弱化部１０は、スカート壁３とバンド９との境界の内周側に存在する複数のブリッジ１０ａと、スカート壁３とバンド９とを上下に画するようにスカート壁３及びバンド９の周方向に延びるスリット１０ｂとで構成され、ブリッジ１０ａが所定の力で引っ張られると破断するように、ブリッジ１０ａの一部（外周部分）もスリット１０ｂで切断されている。
That is, a band 9 is connected to the lower part of the skirt wall 3 via an annular weakening portion 10 extending over the entire circumference of the skirt wall 3 (see FIG. 3), and the annular weakening portion 10 is connected to the skirt wall 3 and the band 9. And a slit 10b extending in the circumferential direction of the skirt wall 3 and the band 9 so as to vertically define the skirt wall 3 and the band 9, and the bridge 10a A portion (outer peripheral portion) of the bridge 10a is also cut by the slit 10b such that the bridge 10a is broken when pulled by a predetermined force.
また、バンド９の内周側には、内向きに突出する係止片（フラップ）１１を、周方向に間隔をおいて複数（本例では８個）設けてある（図１～図２参照）。各係止片１１は、キャップ１が容器口部Ｍに装着された状態で、容器口部Ｍの外周において雄ねじＭ１よりも下方に形成された環状突起（ビード部）Ｍ２の略下側へ位置し、開栓操作によって環状突起Ｍ２に係止する（図３参照）。すなわち、係止片１１は、環状突起Ｍ２に下方から係止可能に構成され、開封の際に、環状弱化部１０より上方にあるキャップ本体部（スカート壁３及び天壁２）は容器口部Ｍから離脱し、環状弱化部１０より下方にあるバンド９は容器口部Ｍに残留し、これに伴って環状弱化部１０は破断する。
A plurality (eight in this example) of locking pieces (flaps) 11 protruding inward are provided on the inner peripheral side of the band 9 at intervals in the circumferential direction (see FIGS. 1 and 2). ). Each locking piece 11 is positioned substantially below the annular projection (bead portion) M2 formed below the male screw M1 on the outer periphery of the container mouth M when the cap 1 is attached to the container mouth M. Then, it is locked to the annular projection M2 by the opening operation (see FIG. 3). That is, the locking piece 11 is configured to be lockable from below on the annular projection M2, and the cap main body (the skirt wall 3 and the top wall 2) above the annular weakening portion 10 is opened at the time of opening. The band 9 detached from the M and located below the annular weakened portion 10 remains in the container mouth M, and the annular weakened portion 10 is broken accordingly.
ここで、バンド９はキャップ本体部（スカート壁３及び天壁２）と一体成形され、バンド９に設けられる係止片１１は、図２に示すように上向きに突出する状態となる。
Here, the band 9 is integrally formed with the cap body (the skirt wall 3 and the top wall 2), and the locking pieces 11 provided on the band 9 are in a state of protruding upward as shown in FIG.
そして、本実施形態では、図２中の拡大図に示すように、スカート壁３の内周面は、上側から、湾曲して外足８の外周面に繋がる折り返し部１２と、下側ほど内径が大となる傾斜部１３と、内径が一定のストレート部１４とを有し、傾斜部１３は折り返し部１２よりも上下幅が大となっている。具体的には、折り返し部１２の上下幅は０．０５ｍｍ～０．３ｍｍ、傾斜部１３の上下幅は０．５ｍｍ～２．０ｍｍとなるように設けることが考えられる。
In the present embodiment, as shown in the enlarged view in FIG. 2, the inner peripheral surface of the skirt wall 3 is bent from the upper side to bend and connected to the outer peripheral surface of the outer foot 8, And a straight portion 14 having a constant inner diameter. The inclined portion 13 has a larger vertical width than the folded portion 12. Specifically, it is conceivable to provide the folded portion 12 so that the vertical width is 0.05 mm to 0.3 mm, and the inclined portion 13 is 0.5 mm to 2.0 mm.
また、図２中の拡大図に示すように、外足８の外周面は、上側から、湾曲してスカート壁３の内周面に繋がる折り返し部１５と、下側ほど内径が小となる傾斜部１６とを有し、スカート壁３の折り返し部１２と外足８の折り返し部１５とは、縦断面視において同一円周上に位置するように構成され、その曲率半径は、スカート壁３の傾斜部１３の縦断面視の曲率半径よりも小さい。本例では、折り返し部１２，１５の縦断面視の曲率半径は０．１ｍｍ、傾斜部１３の縦断面視の曲率半径は３ｍｍである。
As shown in the enlarged view of FIG. 2, the outer peripheral surface of the outer foot 8 is bent from the upper side to have a folded portion 15 connected to the inner peripheral surface of the skirt wall 3, and a slope whose inner diameter becomes smaller toward the lower side. The folded portion 12 of the skirt wall 3 and the folded portion 15 of the outer foot 8 are configured to be located on the same circumference in a longitudinal sectional view, and the radius of curvature of the folded portion 12 is It is smaller than the radius of curvature of the inclined portion 13 in a vertical sectional view. In this example, the radii of curvature of the folded portions 12 and 15 in the vertical cross section are 0.1 mm, and the radii of curvature of the inclined portions 13 in the vertical cross section are 3 mm.
このような構成により、本実施形態のキャップ１では、スカート壁３において外足８に連なる部分の肉厚が大きくなるのでストレス（応力）が掛かった際における割れの発生を効果的に防止することができる。すなわち、図３（Ｃ）は、本実施形態のキャップ１の要部を示し、この図において破線は同図（Ｂ）のスカート壁３を示している。そして、同図（Ｂ）の例では、スカート壁３から外足８にかけての折り返し部５０を縦断面視において同一円周上に位置するように湾曲させているが、本例のキャップ１のように傾斜部１３を設けていない分、その折り返し部５０の曲率半径が大きくなり、それだけスカート壁３において外足８に連なる部分の肉厚が小さくなる。これに対して、傾斜部１３を設けた本例のキャップ１では、同図（Ｃ）に示すように、スカート壁３から外足８にかけての折り返し部１２，１５を縦断面視において同一円周上に位置するように湾曲させるに際し、その折り返し部１２，１５が占める領域が狭くなるとともに、ストレート部１４と折り返し部１２との間に傾斜部１３を設けた分だけスカート壁３を厚肉になる。
With such a configuration, in the cap 1 of the present embodiment, the thickness of the portion of the skirt wall 3 that continues to the outer foot 8 is increased, so that the occurrence of cracks when stress is applied is effectively prevented. Can be. That is, FIG. 3C shows a main part of the cap 1 of the present embodiment, and a broken line in this figure indicates the skirt wall 3 of FIG. 3B. In the example shown in FIG. 2B, the folded portion 50 extending from the skirt wall 3 to the outer foot 8 is curved so as to be located on the same circumference in a longitudinal sectional view. Since the inclined portion 13 is not provided, the radius of curvature of the folded portion 50 is increased, and the thickness of the portion of the skirt wall 3 connected to the outer leg 8 is reduced accordingly. On the other hand, in the cap 1 of the present embodiment provided with the inclined portion 13, the folded portions 12, 15 from the skirt wall 3 to the outer foot 8 have the same circumference in a longitudinal sectional view as shown in FIG. When curved so as to be positioned above, the area occupied by the folded portions 12 and 15 is reduced, and the skirt wall 3 is made thicker by the amount of the inclined portion 13 provided between the straight portion 14 and the folded portion 12. Become.
また、外足８の内周面は下側に向かって拡径し、その勾配θ（図２中の拡大図参照）は１０°以上、好ましくは１２°～１６°である。このような構成により、外足８の付け根付近を肉厚にして密封性の向上を図ることが容易となる。さらに、この効果は、天壁２の下面において外足８と環状リブ６の間の部位よりも、外足８の折り返し部１５とスカート壁３の折り返し部１２との境界を下方に位置させ、外足８が外側に倒れ難くしてあることによって増強される。しかも、この密封性の向上は、天壁２において中足６の内周側の部位より外周側の部位（特に天壁２における中足６と外足８との間の部位）を厚肉にしたことによっても増強される。
Also, the inner peripheral surface of the outer leg 8 expands in diameter toward the lower side, and its gradient θ (see the enlarged view in FIG. 2) is 10 ° or more, preferably 12 ° to 16 °. With such a configuration, it is easy to improve the sealing performance by increasing the thickness near the base of the outer foot 8. Further, this effect is that the boundary between the folded portion 15 of the outer foot 8 and the folded portion 12 of the skirt wall 3 is located lower than the portion between the outer foot 8 and the annular rib 6 on the lower surface of the top wall 2, This is enhanced by the fact that the outer foot 8 is hard to fall outward. In addition, this improvement in the sealing performance is achieved by increasing the thickness of the portion of the top wall 2 located on the outer peripheral side of the inner peripheral side of the middle foot 6 (particularly, the portion of the top wall 2 between the middle foot 6 and the outer foot 8). It is also enhanced by doing.
なお、本発明は、上記の実施の形態に何ら限定されず、本発明の要旨を逸脱しない範囲において種々に変形して実施し得ることは勿論である。例えば、以下のような変形例を挙げることができる。
Note that the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made without departing from the spirit of the present invention. For example, the following modifications can be given.
例えば、上記実施の形態では、傾斜部１３の縦断面形状を円弧状としているが、これに限らず、例えば、傾斜部１３の縦断面形状を下側ほど外側に位置するように一定の勾配で傾斜する形状としてもよい。すなわち、傾斜部１３は、縦断面視において、折り返し部１２，１５と同一円周状に位置せず、折り返し部１２よりも緩やかな勾配で、かつ、折り返し部１２よりも広範囲にわたって下側に向かって拡径していればよい。
For example, in the above-described embodiment, the vertical cross-sectional shape of the inclined portion 13 is an arc shape. However, the present invention is not limited to this. The shape may be inclined. That is, the inclined portion 13 is not located in the same circumferential shape as the folded portions 12 and 15 in the vertical cross section, and has a gentler gradient than the folded portion 12 and extends downward over a wider range than the folded portion 12. The diameter should just be expanded.
本明細書で挙げた変形例どうしを適宜組み合わせてもよいことはいうまでもない。
変 形 It goes without saying that the modifications described in this specification may be combined as appropriate.
１ 合成樹脂製キャップ
２ 天壁
３ スカート壁
４ ローレット溝
５ 雌ねじ
６ 中足
７ 環状リブ
８ 外足
９ タンパーエビデンスバンド
１０ 環状弱化部
１０ａ ブリッジ
１０ｂ スリット
１１ 係止片
１２ 折り返し部
１３ 傾斜部
１４ ストレート部
１５ 折り返し部
１６ 傾斜部
５０ 折り返し部
Ｍ 容器口部
Ｍ１ 雄ねじ
Ｍ２ 環状突起
θ 勾配Reference Signs List 1 synthetic resin cap 2 top wall 3 skirt wall 4 knurl groove 5 female screw 6 middle foot 7 annular rib 8 outer foot 9 tamper evidence band 10 annular weakened portion 10a bridge 10b slit 11 locking piece 12 folded portion 13 inclined portion 14 straight portion 15 Folded part 16 Inclined part 50 Folded part M Container mouth M1 Male screw M2 Annular protrusion θ Slope
２ 天壁
３ スカート壁
４ ローレット溝
５ 雌ねじ
６ 中足
７ 環状リブ
８ 外足
９ タンパーエビデンスバンド
１０ 環状弱化部
１０ａ ブリッジ
１０ｂ スリット
１１ 係止片
１２ 折り返し部
１３ 傾斜部
１４ ストレート部
１５ 折り返し部
１６ 傾斜部
５０ 折り返し部
Ｍ 容器口部
Ｍ１ 雄ねじ
Ｍ２ 環状突起
θ 勾配
Claims (2)
- 天壁と、この天壁の外周部から下方に向かって延び、容器口部の雄ねじに螺合する雌ねじを有するスカート壁とを備え、前記天壁の下面には、前記容器口部の内周面に密着する環状の中足と、前記容器口部の外周面に密着する環状の外足とを一体的に形成してある合成樹脂製キャップであって、
前記スカート壁の内周面は、上側から、湾曲して前記外足の外周面に繋がる折り返し部と、下側ほど内径が大となる傾斜部と、内径が一定のストレート部とを有し、前記傾斜部は前記折り返し部よりも上下幅が大となっていることを特徴とする合成樹脂製キャップ。 A top wall, and a skirt wall extending downward from an outer peripheral portion of the top wall and having a female screw that is screwed into a male screw of the container mouth; an inner periphery of the container mouth is provided on a lower surface of the top wall. A synthetic resin cap formed integrally with an annular middle foot that is in close contact with the surface and an annular outer foot that is in close contact with the outer peripheral surface of the container mouth part,
The inner peripheral surface of the skirt wall has, from the upper side, a folded portion curved and connected to the outer peripheral surface of the outer foot, an inclined portion having a larger inner diameter toward the lower side, and a straight portion having a constant inner diameter, The synthetic resin cap, wherein the inclined portion has a larger vertical width than the folded portion. - 前記外足の内周面は下側に向かって拡径し、その勾配が１０°以上である請求項１に記載の合成樹脂製キャップ。 合成 The synthetic resin cap according to claim 1, wherein the inner peripheral surface of the outer foot expands in diameter toward a lower side and has a gradient of 10 ° or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020546755A JP7332613B2 (en) | 2018-09-13 | 2019-08-06 | Synthetic resin cap |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018-171089 | 2018-09-13 | ||
| JP2018171089 | 2018-09-13 |
Publications (1)
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| WO2020054259A1 true WO2020054259A1 (en) | 2020-03-19 |
Family
ID=69777224
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2019/030818 WO2020054259A1 (en) | 2018-09-13 | 2019-08-06 | Synthetic resin cap |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP7332613B2 (en) |
| WO (1) | WO2020054259A1 (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6126027A (en) * | 1995-02-21 | 2000-10-03 | Mcg Closures Limited | Self-centering container closure |
| JP2002068236A (en) * | 2000-08-25 | 2002-03-08 | Shibazaki Seisakusho Ltd | Synthetic resin cap |
| JP2009107704A (en) * | 2007-10-31 | 2009-05-21 | Japan Crown Cork Co Ltd | Plastic cap |
| WO2012020637A1 (en) * | 2010-08-09 | 2012-02-16 | 日本山村硝子株式会社 | Resin cap |
| JP2014069828A (en) * | 2012-09-28 | 2014-04-21 | Toyo Seikan Kaisha Ltd | Packing container |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19705717A1 (en) | 1997-02-14 | 1998-08-20 | Bericap Gmbh & Co Kg | Plastic screw cap |
| JP5977937B2 (en) | 2011-11-21 | 2016-08-24 | 株式会社Ｃｓｉジャパン | Synthetic resin cap for carbonated beverage filling container, closure device, and beverage closure device |
-
2019
- 2019-08-06 JP JP2020546755A patent/JP7332613B2/en active Active
- 2019-08-06 WO PCT/JP2019/030818 patent/WO2020054259A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6126027A (en) * | 1995-02-21 | 2000-10-03 | Mcg Closures Limited | Self-centering container closure |
| JP2002068236A (en) * | 2000-08-25 | 2002-03-08 | Shibazaki Seisakusho Ltd | Synthetic resin cap |
| JP2009107704A (en) * | 2007-10-31 | 2009-05-21 | Japan Crown Cork Co Ltd | Plastic cap |
| WO2012020637A1 (en) * | 2010-08-09 | 2012-02-16 | 日本山村硝子株式会社 | Resin cap |
| JP2014069828A (en) * | 2012-09-28 | 2014-04-21 | Toyo Seikan Kaisha Ltd | Packing container |
Also Published As
| Publication number | Publication date |
|---|---|
| JPWO2020054259A1 (en) | 2021-08-30 |
| JP7332613B2 (en) | 2023-08-23 |
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