JP2020070031A - Synthetic resin container lid - Google Patents
Synthetic resin container lid Download PDFInfo
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- JP2020070031A JP2020070031A JP2018203523A JP2018203523A JP2020070031A JP 2020070031 A JP2020070031 A JP 2020070031A JP 2018203523 A JP2018203523 A JP 2018203523A JP 2018203523 A JP2018203523 A JP 2018203523A JP 2020070031 A JP2020070031 A JP 2020070031A
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- circumferential direction
- container lid
- tamper
- fitting
- skirt
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- 229920003002 synthetic resin Polymers 0.000 title claims abstract description 31
- 239000000057 synthetic resin Substances 0.000 title claims abstract description 31
- 230000002093 peripheral effect Effects 0.000 claims description 55
- 238000000465 moulding Methods 0.000 description 5
- 238000004140 cleaning Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- -1 polyethylene Polymers 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000005489 elastic deformation Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 230000009194 climbing Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
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- Closures For Containers (AREA)
Abstract
Description
本発明は、スカート壁におけるタンパーエビデント裾部の内周面には、周方向に延在する複数個の係止突条或いは周方向に連続して延在する環状係止突条から構成された係止手段が形成されていると共に、上下方向に見て係止突条の上面から上方に向かって内径が漸次増大する嵌合面を有する嵌合部が形成されている形態の合成樹脂製容器蓋に関する。 According to the present invention, the inner peripheral surface of the tamper-evidence skirt portion of the skirt wall comprises a plurality of circumferentially extending locking projections or an annular locking projection continuously extending in the circumferential direction. And a fitting portion having a fitting surface whose inner diameter gradually increases from the upper surface of the locking projection when viewed in the vertical direction. Regarding the container lid.
周知の如く、ガラス、合成樹脂或いは金属薄板から形成され、円筒形状である口頸部の外周面には雄螺条とこの雄螺条の下方に位置する係止あご部が配設されている容器のための容器蓋として、円形天面壁とこの天面壁の周縁から垂下する円筒形スカート壁とを具備し、スカート壁には周方向に間隔おいて周方向に延びるスリットとかかるスリット間に存在する橋絡部とから構成された周方向に延びる破断ラインが形成されており、スカート壁は破断ラインよりも上方の主部と破断ラインよりも下方のタンパーエビデント裾部とに区画されている合成樹脂製容器蓋が広く実用に供されている。スカート壁の主部の内周面には雌螺条が形成され、タンパーエビデント裾部の内周面には係止手段が形成されている。係止手段は、半径方向内方に突出し且つ周方向に延在する複数個の係止突条或いは半径方向内方に突出し且つ周方向に連続して延在する環状係止突条から構成されている。 As is well known, a male screw and a locking jaw located below the male screw are provided on the outer peripheral surface of the mouth-neck portion which is formed of glass, synthetic resin or a metal thin plate and has a cylindrical shape. As a container lid for a container, a circular top wall and a cylindrical skirt wall hanging down from the peripheral edge of the top wall are provided, and the skirt wall has slits extending in the circumferential direction at intervals in the circumferential direction and existing between the slits. A rupture line extending in the circumferential direction is formed, which is composed of a bridging portion that forms a skirt wall, and the skirt wall is divided into a main part above the rupture line and a tamper-evidence hem below the rupture line. Synthetic resin container lids are widely used in practice. A female thread is formed on the inner peripheral surface of the main portion of the skirt wall, and a locking means is formed on the inner peripheral surface of the tamper-evident skirt. The locking means is composed of a plurality of locking projections protruding inward in the radial direction and extending in the circumferential direction, or an annular locking projection protruding inward in the radial direction and continuously extending in the circumferential direction. ing.
内容物が充填された容器の口頸部を密封する際には、口頸部に容器蓋を被嵌せしめて閉回転方向に回転せしめ、口頸部の雄螺条に容器蓋の雌螺条を螺合せしめる。かくして口頸部に容器蓋を所要とおりに装着すると、容器蓋の係止手段は口頸部の係止あご部を弾性的に乗り越えてその下方に位置する。口頸部を開封して容器の内容物を消費する際には、容器蓋を開方向に回転せしめる。かくすると、雄螺条と雌螺条との螺合解除に応じて口頸部に対して容器蓋が上昇せしめられる。容器蓋が幾分上昇せしめられると、容器蓋の係止手段が口頸部の係止あご部に係止せしめられ、これによってタンパーエビデント裾部の上昇が阻止される。容器蓋の開方向への回転を続けると、スカート壁に形成されている周方向破断ラインが破断され、スカート壁のタンパーエビデント裾部が主部から分離される（或いは、タンパーエビデント裾部に軸線方向破断ラインが形成されている場合には、軸線方向破断ラインが破断されてタンパーエビデント裾部が無端環状から有端帯状に展開され、タンパーエビデント裾部は主部から完全に分離されることなく周方向の一部において主部に接続され続ける）。容器蓋の開方向への回転を続けると、タンパーエビデント裾部を残留せしめて容器蓋が（或いはタンパーエビデント裾部を含む容器蓋の全体が）口頸部から離脱され、口頸部が開封される。 When sealing the mouth and neck of a container filled with contents, put the container lid on the mouth and neck and rotate it in the closing rotation direction, and make the male thread of the mouth and neck female thread of the container lid. Screw together. Thus, when the container lid is mounted on the mouth and neck as required, the locking means of the container lid elastically rides over the locking jaw of the mouth and neck and is located below it. When the contents of the container are consumed by opening the mouth and neck, the container lid is rotated in the opening direction. Thus, the container lid is raised with respect to the mouth and neck in response to the unscrewing of the male screw and the female screw. When the container lid is raised to some extent, the locking means of the container lid is locked to the locking jaw of the mouth and neck, which prevents the tamper evidence hem from rising. When the container lid continues to rotate in the opening direction, the circumferential break line formed on the skirt wall is broken, and the tamper-evident skirt of the skirt wall is separated from the main part (or the tamper-evident skirt). If an axial break line is formed on the, the axial break line is broken and the tamper-evidence skirt expands from an endless ring to an endless belt, and the tamper-evident skirt is completely separated from the main part. Continues to be connected to the main part in the circumferential direction without being). When the container lid continues to rotate in the opening direction, the tamper-evidence hem is left behind, and the container lid (or the entire container lid including the tamper-evident hem) is separated from the mouth-neck and the mouth-neck is removed. It is opened.
下記特許文献１には、破断ラインが破断されることなく容器蓋の全体が容器の口頸部から離脱されてしまう所謂すっぽ抜けを回避するために、タンパーエビデント裾部の内周面に、係止突条の上面から上方に向かって半径方向内径が漸次増大し且つ周方向に連続して存在する環状嵌合面を有する嵌合部を形成することが開示されている。かような嵌合部が形成されている容器蓋においては、係止突条が口頸部の係止あご部の下面に係止する際には、嵌合部の嵌合面が係止あご部の外周面に密接せしめられて、タンパーエビデント裾部が弾性的に変形乃至変位することが防止され、かくしてすっぽ抜けが防止される。しかしながら、上記のとおりの嵌合面を有する嵌合部を形成すると、容器の口頸部から容器蓋を離脱せしめる際の、容器蓋回転開始時の必要トルク（一般に「ファーストトルク」と称されている）と破断ラインを破断する時の必要トルク（一般に「セカンドトルク」と称されている）との間における必要トルクが充分に小さい値にならず、消費者に不快な違和感、即ち容器蓋の回転に対して抵抗する所謂引きずり感を与えることが判明している。 In Patent Document 1 below, in order to avoid a so-called slip-out in which the entire container lid is detached from the mouth and neck of the container without breaking the break line, the inner peripheral surface of the tamper evidence hem is It is disclosed that a fitting portion having an annular fitting surface in which the inner diameter in the radial direction gradually increases from the upper surface of the locking projection and continuously exists in the circumferential direction is disclosed. In a container lid in which such a fitting portion is formed, when the locking ridge is locked on the lower surface of the locking jaw of the mouth and neck, the fitting surface of the fitting portion is locked by the locking jaw. The tamper-evidence skirt is prevented from elastically deforming or displacing by being brought into close contact with the outer peripheral surface of the part, thus preventing the tail from coming off. However, when the fitting portion having the fitting surface as described above is formed, the required torque at the time of starting the rotation of the container lid when the container lid is detached from the mouth and neck of the container (generally referred to as “first torque”). The torque required for breaking the breaking line (generally referred to as “second torque”) does not become a sufficiently small value, which is uncomfortable for the consumer, that is, the container lid is uncomfortable. It has been found to give a so-called drag feeling that resists rotation.
下記特許文献２には、上記ファーストトルクと上記セカンドトルクとの間の必要トルクを低減せしめるために、嵌合部の嵌合面を粗面にすることが提案されている。また、下記特許文献３には、容器に内容物を充填する際に口頸部に付着した内容物を洗浄するために口頸部に噴射された洗浄液を流下せしめるために、係止手段を構成する複数個の係止突条間においては嵌合部を省略して排液路を規定することが開示されている。係止突条間において嵌合部を省略すると、これに起因して係止あご部と嵌合面との接触面積が低減され、上記ファーストトルクと上記セカンドトルクとの間の必要トルクが幾分低減される。 Patent Document 2 below proposes that the fitting surface of the fitting portion is roughened in order to reduce the required torque between the first torque and the second torque. Further, in Patent Document 3 below, a locking means is configured in order to allow the cleaning liquid sprayed to the mouth / neck portion to flow down in order to wash the content attached to the mouth / neck portion when the container is filled with the content. It is disclosed that the fitting portion is omitted between the plurality of locking protrusions to define the drainage passage. If the fitting portion is omitted between the locking ridges, the contact area between the locking jaw and the fitting surface is reduced due to this, and the required torque between the first torque and the second torque is somewhat reduced. Will be reduced.
而して、上記特許文献２及び３に開示されている容器蓋によれば、上記特許文献１に開示されている容器蓋に比べて、上記ファーストトルクと上記セカンドトルクとの間の必要トルクが幾分か低減されるが、本発明者等の経験によれば、上記ファーストトルクと上記セカンドトルクとの間の必要トルクの低減は未だ充分ではなく、消費者に不快な違和感、即ち容器蓋の回転に対して抵抗する所謂引きずり感を与えることが充分確実に回避されない。 Thus, according to the container lid disclosed in the above-mentioned Patent Documents 2 and 3, compared with the container lid disclosed in the above-mentioned Patent Document 1, the required torque between the first torque and the second torque is Although it is somewhat reduced, according to the experience of the present inventors, the reduction of the required torque between the first torque and the second torque is not yet sufficient, and the consumer feels uncomfortable, that is, the container lid is uncomfortable. A so-called dragging feeling that resists rotation is not sufficiently avoided.
本発明は上記事実に鑑みてなされたものであり、その第一の技術的課題は、上記ファーストトルクと上記セカンドトルクとの間の必要トルクが充分に低減される、新規且つ改良された合成樹脂製容器蓋を提供することである。 The present invention has been made in view of the above facts, and a first technical problem thereof is a new and improved synthetic resin in which the required torque between the first torque and the second torque is sufficiently reduced. It is to provide a container lid.
本発明の第二の技術的課題は、上記第一の技術的課題の達成に加えて、係止突条の存在に起因してタンパーエビデント裾部の内周面にはアンダーカットが形成されており、これによって成形された容器蓋を成形型から取り出す際には所謂無理抜きを生じ、係止突条の周方向両端部には比較的大きな力がかかるにも拘らず、係止突条の周方向両端部の変形が抑制される、新規且つ改良された合成樹脂製容器蓋を提供することである。 A second technical problem of the present invention is that, in addition to the achievement of the first technical problem, an undercut is formed on the inner peripheral surface of the tamper-evident hem due to the presence of the locking projections. Therefore, when the container lid molded by this is taken out from the molding die, so-called forced pulling occurs, and although relatively large force is applied to both ends in the circumferential direction of the locking projection, the locking projection is (EN) Provided is a new and improved synthetic resin container lid in which the deformation of both ends in the circumferential direction is suppressed.
本発明の第三の技術的課題は、上記第一及び第二の技術的課題の達成に加えて、係止手段を構成する複数個の係止突条の各々が、タンパーエビデント裾部の内周面から半径方向内方に延出する上面、下方に向かって漸次内径が増大する下面、及び該上面と該下面との境界に位置する内面を有し、係止突条の周方向両端部においては上面の半径方向内方への延出長さが周方向両端に向かって漸次低減され及び／又は下面の下端が周方向両端に向かって漸次上方に変位しており、従って係止突条の両端部は中心部に比べて剛性が低い場合でも、成形された容器蓋を成形型から取り出す際に係止突条の両端部が変形されてしまうことが確実に回避される、新規且つ改良された合成樹脂製容器蓋を提供することである。 A third technical problem of the present invention is that, in addition to the achievement of the first and second technical problems, each of the plurality of locking projections constituting the locking means has a tamper-evident hem. Both ends in the circumferential direction of the locking projection have an upper surface extending radially inward from the inner peripheral surface, a lower surface whose inner diameter gradually increases downward, and an inner surface located at the boundary between the upper surface and the lower surface. In the portion, the extending length of the upper surface inward in the radial direction is gradually reduced toward both ends in the circumferential direction and / or the lower end of the lower surface is gradually displaced upward toward both ends in the circumferential direction. Even if both end portions of the strip have a lower rigidity than the central portion, it is possible to reliably avoid that both end portions of the locking projection strip are deformed when the molded container lid is taken out from the molding die. An object is to provide an improved synthetic resin container lid.
本発明者等は、鋭意検討の結果、嵌合面を有する嵌合部を周方向に間隔をおいて複数個形成し、かかる嵌合部の周方向配列を適宜に設定することによって、上記第一の技術的課題を達成し、そしてまた上記第一の技術的課題と共に上記第二及び第三の技術的課題を達成することができることを見出した。 As a result of earnest studies, the inventors of the present invention have formed a plurality of fitting portions having fitting surfaces at intervals in the circumferential direction, and appropriately setting the circumferential arrangement of such fitting portions, thereby It has been found that one technical problem can be achieved and also that the second and third technical problems can be achieved together with the first technical problem.
本発明の一局面によれば、上記第一の技術的課題を達成する合成樹脂製容器蓋として、
円形天面壁と該天面壁の周縁から垂下する円筒形スカート壁とを具備し、該スカート壁には周方向に間隔をおいて周方向に延びる複数個のスリットと該スリット間に存在する複数個の橋絡部とから構成された周方向に延びる破断ラインが形成されており、該スカート壁は該破断ラインよりも上方の主部と該破断ラインよりも下方のタンパーエビデント裾部とに区画されており、該主部の内周面には雌螺条が形成され、該タンパーエビデント裾部の内周面には半径方向内方に突出し且つ周方向に延在する複数個の係止突条から構成された係止手段が配設されている合成樹脂製容器蓋において、
該タンパーエビデント裾部の内周面には、該係止突条の上面から上方に向かって内径が漸次増大する嵌合面を有する嵌合部が、該係止突条の各々に対して周方向に間隔をおいて複数個配設されている、ことを特徴とする合成樹脂製容器蓋が提供される。
According to one aspect of the present invention, as a synthetic resin container lid that achieves the first technical problem,
A circular top wall and a cylindrical skirt wall hanging down from the peripheral edge of the top wall, wherein the skirt wall has a plurality of slits extending in the circumferential direction at intervals in the circumferential direction and a plurality of slits existing between the slits. A rupture line extending in the circumferential direction is formed, and the skirt wall is divided into a main part above the rupture line and a tamper-evidence skirt below the rupture line. A female screw thread is formed on the inner peripheral surface of the main portion, and a plurality of locking members protruding inward in the radial direction and extending in the peripheral direction are formed on the inner peripheral surface of the tamper-evident skirt. In a synthetic resin container lid in which locking means composed of a ridge is provided,
On the inner peripheral surface of the tamper-evident skirt, a fitting portion having a fitting surface whose inner diameter gradually increases from the upper surface of the locking projection is provided for each locking projection. There is provided a synthetic resin container lid, characterized in that a plurality of them are arranged at intervals in the circumferential direction.
本発明の他の局面によれば、上記第一の技術的課題を達成する合成樹脂製容器蓋として、
円形天面壁と該天面壁の周縁から垂下する円筒形スカート壁とを具備し、該スカート壁には周方向に間隔をおいて周方向に延びる複数個のスリットと該スリット間に存在する複数個の橋絡部とから構成された周方向に延びる破断ラインが形成されており、該スカート壁は該破断ラインよりも上方の主部と該破断ラインよりも下方のタンパーエビデント裾部とに区画されており、該主部の内周面には雌螺条が形成され、該タンパーエビデント裾部の内周面には半径方向内方に突出し且つ周方向に連続して延在する環状係止突条から構成された係止手段が配設されている合成樹脂製容器蓋において、
該タンパーエビデント裾部の内周面には、該係止手段の上面から上方に向かって内径が漸次増大する嵌合面を有する嵌合部が、周方向に間隔をおいて複数個配設されている、ことを特徴とする合成樹脂製容器蓋が提供される。
According to another aspect of the present invention, as a synthetic resin container lid that achieves the first technical problem,
A circular top wall and a cylindrical skirt wall hanging down from the peripheral edge of the top wall, wherein the skirt wall has a plurality of slits extending in the circumferential direction at intervals in the circumferential direction and a plurality of slits existing between the slits. A rupture line extending in the circumferential direction is formed, and the skirt wall is divided into a main part above the rupture line and a tamper-evidence skirt below the rupture line. An internal thread is formed on the inner peripheral surface of the main portion, and an annular engagement member that protrudes radially inward and continuously extends in the circumferential direction is formed on the inner peripheral surface of the tamper-evident skirt. In a synthetic resin container lid in which a locking means composed of a stop ridge is arranged,
On the inner peripheral surface of the tamper-evident skirt, a plurality of fitting portions having fitting surfaces whose inner diameter gradually increases from the upper surface of the locking means are arranged at intervals in the circumferential direction. The container lid made of synthetic resin is provided.
上記本発明の第二の技術的課題は、上記本発明の上記一局面によっておいて提供される合成樹脂製容器蓋において、
該嵌合部は該係止突条の周方向両端部の各々に対応して配設されている、形態にせしめることによって達成される。
The second technical problem of the present invention, in the synthetic resin container lid provided in the above aspect of the present invention,
The fitting portion is achieved by providing a form in which the fitting portion is provided so as to correspond to both ends of the locking projection in the circumferential direction.
上記本発明の第三の技術的課題は、上記本発明の上記一局面によっておいて提供される合成樹脂製容器蓋において、
該係止突条の各々は該タンパーエビデント裾部の内周面から半径方向内方に延出する上面、下方に向かって漸次内径が増大する下面、及び該上面と該下面との境界に位置する内面を有し、該係止突条の周方向両端部においては該上面の半径方向内方への延出長さが周方向両端に向かって漸次低減され及び／又は該下面の下端が周方向両端に向かって漸次上方に変位しており、
該係止突条の該周方向両端部の各々に対応して周方向幅が比較的大きい１個の該嵌合部が配設され、該係止突条の周方向中央部に対応して周方向幅が比較的小さい少なくとも１個の該嵌合部が配設されている、形態にせしめることによって達成される。
The third technical problem of the present invention is a synthetic resin container lid provided by the above-mentioned one aspect of the present invention,
Each of the locking projections has an upper surface extending inward in the radial direction from the inner peripheral surface of the tamper-evident skirt, a lower surface whose inner diameter gradually increases downward, and a boundary between the upper surface and the lower surface. The inner surface of the locking protrusion is located at both ends in the circumferential direction, and the radially inward extending length of the upper surface is gradually reduced toward both ends in the circumferential direction and / or the lower end of the lower surface is It is gradually displaced upward toward both ends in the circumferential direction,
One fitting portion having a relatively large circumferential width is arranged corresponding to each of the both ends of the locking projection in the circumferential direction, and one fitting portion having a relatively large width in the circumferential direction is provided, corresponding to the central portion of the locking projection in the circumferential direction. This is achieved by providing a form in which at least one fitting portion having a relatively small circumferential width is provided.
該嵌合部の該嵌合面は、ＪＩＳ Ｂ０６０１で定義されている算術平均粗さ（Ｒａ）で２乃至２０μｍの粗面であるのが好都合である。 The fitting surface of the fitting portion is preferably a rough surface having an arithmetic average roughness (Ra) defined in JIS B0601 of 2 to 20 μm.
本発明の上記一局面によって提供される合成樹脂製容器蓋及び本発明の上記他の局面によって提供される合成樹脂製容器蓋においては、周方向に連続して延在する嵌合部ではなくて周方向に間隔をおいて複数個の嵌合部が適宜に配列されている故に、口頸部の係止あご部の外周面と嵌合部の嵌合面との接触面積が大幅に低減され、これに起因して上記ファーストトルクと上記セカンドトルクとの間の必要トルクが充分に低減される。 In the synthetic resin container lid provided by the one aspect of the present invention and the synthetic resin container lid provided by the other aspect of the present invention, not the fitting portion extending continuously in the circumferential direction. Since a plurality of fitting parts are properly arranged at intervals in the circumferential direction, the contact area between the outer peripheral surface of the locking jaw of the mouth and neck and the fitting surface of the fitting part is significantly reduced. Due to this, the required torque between the first torque and the second torque is sufficiently reduced.
該嵌合部は該係止突条の周方向両端部の各々に対応して配設されている形態の場合、周方向両端部に配設された嵌合部の存在に起因して係止突条が補強されるため、成形された容器蓋を成形型から取り出す際に係止手段の無理抜きが生じても、係止突条の両端部の変形が抑制される。 In the case where the fitting portion is arranged corresponding to each of both circumferential ends of the locking projection, the fitting portion is locked due to the presence of the fitting portions arranged at both circumferential ends. Since the ridges are reinforced, even if the locking means is forcibly pulled out when the molded container lid is taken out from the molding die, the deformation of both ends of the locking ridges is suppressed.
該係止突条の各々は該タンパーエビデント裾部の内周面から半径方向内方に延出する上面、下方に向かって漸次内径が増大する下面、及び該上面と該下面との境界に位置する内面を有し、該係止突条の周方向両端部においては該上面の半径方向内方への延出長さが周方向両端に向かって漸次低減され及び／又は該下面の下端が周方向両端に向かって漸次上方に変位している形態の場合、係止突条の両端部は剛性が低減されるが、該係止突条の該周方向両端部の各々に対応して周方向幅が比較的大きい１個の該嵌合部が配設されていると、成形された容器蓋を成形型から取り出す際における係止手段の両端部の無理抜きが、周方向幅が比較的大きい嵌合部の存在によって緩和され、成形された容器蓋を成形型から取り出す際に係止突条の両端部が変形されてしまうことが確実に回避される。 Each of the locking projections has an upper surface extending inward in the radial direction from the inner peripheral surface of the tamper-evident skirt, a lower surface whose inner diameter gradually increases downward, and a boundary between the upper surface and the lower surface. The inner surface of the locking protrusion is located at both ends in the circumferential direction, and the radially inward extending length of the upper surface is gradually reduced toward both ends in the circumferential direction and / or the lower end of the lower surface is In the case of a form in which the locking projections are gradually displaced upward toward both ends in the circumferential direction, the rigidity of the both ends of the locking projection is reduced, but the rigidity is reduced at both ends of the locking projection in the circumferential direction. If the one fitting portion having a relatively large width in the direction is provided, it is possible to force the both ends of the locking means to be relatively wide in the circumferential direction when the molded container lid is taken out from the molding die. Both ends of the locking ridges are eased when the molded container lid is taken out of the mold, which is mitigated by the presence of a large fitting part. It is reliably avoided would be deformed.
以下、添付図面を参照して、本発明の一局面に従って構成された合成樹脂製容器蓋の好適実施形態について、更に詳述する。 Hereinafter, preferred embodiments of a synthetic resin container lid configured according to one aspect of the present invention will be described in further detail with reference to the accompanying drawings.
図１を参照して説明すると、ポリエチレン又はポリプロピレンの如き適宜の合成樹脂から射出成形又は圧縮成形することができる容器蓋２は、円形天面壁４とこの天面壁４の周縁から垂下する円筒形スカート壁６とを具備する。天面壁４の内面外周縁部には、下方に垂下する比較的長い筒状の内側シール片８及び下方に垂下する比較的短い筒状の外側シール片１０が形成されている。 Referring to FIG. 1, a container lid 2 that can be injection molded or compression molded from a suitable synthetic resin such as polyethylene or polypropylene comprises a circular top wall 4 and a cylindrical skirt that hangs from the periphery of the top wall 4. And a wall 6. On the outer peripheral edge of the inner surface of the top wall 4, a relatively long cylindrical inner seal piece 8 that hangs downward and a relatively short cylindrical outer seal piece 10 that hangs downward are formed.
スカート壁６には周方向に延びる破断ライン１２が形成されており、スカート壁６は破断ライン１２より上方の主部１４と破断ライン１２より下方のタンパーエビデント裾部１６とに区画されている。破断ライン１２は周方向に間隔をおいて周方向に延びる複数個のスリット（切り溝）１８とスリット１８間に存在する複数個の橋絡部２０とから構成されており、タンパーエビデント裾部１６は複数個の橋絡部２０を介して主部１４に接続されている。 A rupture line 12 extending in the circumferential direction is formed on the skirt wall 6, and the skirt wall 6 is divided into a main portion 14 above the rupture line 12 and a tamper-evidence hem portion 16 below the rupture line 12. .. The breaking line 12 is composed of a plurality of slits (kerfs) 18 extending in the circumferential direction at intervals in the circumferential direction and a plurality of bridging portions 20 existing between the slits 18, and the tamper-evidence skirt portion. 16 is connected to the main portion 14 via a plurality of bridging portions 20.
スカート壁６の主部１４の外周面には、周方向に見て交互に存在する凹凸形状から構成された滑り止めローレット２２が形成されている。スカート壁６の主部１４の内周面には雌螺条２４が形成されている。雌螺条２４には周方向に間隔をおいて複数個の螺条高さ低減部２６が設けられている。 On the outer peripheral surface of the main portion 14 of the skirt wall 6, there are formed anti-slip knurls 22 having an uneven shape which are present alternately in the circumferential direction. A female thread 24 is formed on the inner peripheral surface of the main portion 14 of the skirt wall 6. The female thread 24 is provided with a plurality of thread height reducing portions 26 at intervals in the circumferential direction.
タンパーエビデント裾部１６の内周面には係止手段２７が配設されている。図示の実施形態においては、係止手段２７は、半径方向内方に突出し且つ周方向に延在する複数個（図示の実施形態においては５個）の係止突条２８から構成されている。図１と共に図２を参照して説明すると、係止突条２８の各々の主部（両端部を除く部分）の縦断面形状は略直角三角形状であり、係止突条２８の各々はタンパーエビデント裾部１６の内周面から半径方向内方に延出する上面３０、下方に向かって漸次内径が増大する下面３２、及び上面３０と下面３２との境界に位置する内面３４を有している。係止突条２８の周方向両端部においては上面３０の半径方向内方への延出長さが周方向両端に向かって漸次低減され及び／又は下面３２の下端が周方向両端に向かって漸次上方に変位しているのが好ましい。図示の実施形態においては、係止突条２８の周方向両端部における上面３０の半径方向内方への延出長さは（必ずしも明確に図示はされていないが）周方向両端に向かって漸次低減されていると共に、下面３２の下端は周方向両端に向かって漸次上方に変位せしめられている。 Locking means 27 is provided on the inner peripheral surface of the tamper-evidence skirt portion 16. In the illustrated embodiment, the locking means 27 is composed of a plurality of (five in the illustrated embodiment) locking projections 28 that project inward in the radial direction and extend in the circumferential direction. Referring to FIG. 2 together with FIG. 1, the longitudinal section of each main portion (portion excluding both ends) of the locking ridge 28 is substantially right triangle, and each of the locking ridge 28 is a tamper. It has an upper surface 30 extending inward in the radial direction from the inner peripheral surface of the evidence skirt 16, a lower surface 32 whose inner diameter gradually increases downward, and an inner surface 34 located at the boundary between the upper surface 30 and the lower surface 32. ing. At both circumferential ends of the locking ridge 28, the radially inward extending length of the upper surface 30 is gradually reduced toward both circumferential ends, and / or the lower end of the lower surface 32 is gradually toward both circumferential ends. It is preferably displaced upwards. In the illustrated embodiment, the radially inward extending length of the upper surface 30 at both circumferential ends of the locking projection 28 is gradually (although not necessarily explicitly shown) toward both circumferential ends. While being reduced, the lower end of the lower surface 32 is gradually displaced upward toward both ends in the circumferential direction.
タンパーエビデント裾部１６の内周面には、径方向内方に突出した環状突条３６も形成されている。環状突条３６は、図２を参照することによって明確に理解されるとおり、上下方向に見て係止突条２８の上面３０に接続される部位に設けられている。図１と共に図３を参照して説明を続けると、本発明の容器蓋にあっては、タンパーエビデント裾部１６の内周面に、上下方向に見て係止突条２８の上面３０から上方に向かって内径が漸次増大する嵌合面３８を有する嵌合部４０が、係止突条２８の各々に対して周方向に間隔をおいて複数個配設されていることが重要である。図示の実施形態においては、係止突条２８の周方向両端部の各々に対応して周方向幅が比較的大きい１個の嵌合部４０ａが配設され、係止突条２８の周方向中央部に対応して周方向幅が比較的小さい複数個（図示の実施形態においては３個）の嵌合部４０ｂが配設されている。一つの係止突条２８について着目すると、これの上面３０に形成された複数個の嵌合部４０の夫々の周方向間隔は何れも等しい。そして、嵌合部４０の嵌合面３８は何れも係止突条２８の上面から上方に向かって延びている。ここで、図３に示すとおり、周方向幅が比較的大きい嵌合部４０ａの周方向幅をｄ１、周方向幅が比較的小さい嵌合部４０ｂの周方向幅をｄ２、一の係止突条２８の上面３０に形成された複数個の嵌合部４０の周方向間隔をｄ３、周方向に隣接して配設された２つの係止突条２８において周方向に隣接する嵌合部４０ａの周方向間隔をｄ４とすると、ｄ１＝３ｄ２、ｄ３＝２ｄ２、ｄ４＝ｄ２となるように設定されている。嵌合面３８の縦断面形状はいずれも弧状であって、嵌合面３８と環状突条３６の内面とは実質上面一にせしめられている。所望ならば、嵌合面３８の縦断面形状は直線状であってよく、また、環状突条３６の内面は嵌合面３８よりも半径方向外側に位置していてもよい。図示の実施形態においては更に、嵌合面３８は、ＪＩＳ Ｂ０６０１で定義されている算術平均粗さ（Ｒａ）で２乃至２０μｍの粗面となっている。 An annular projection 36 is formed on the inner peripheral surface of the tamper-evidence skirt 16 so as to project radially inward. As clearly understood by referring to FIG. 2, the annular protrusion 36 is provided at a portion connected to the upper surface 30 of the locking protrusion 28 when viewed in the vertical direction. Continuing the description with reference to FIG. 3 together with FIG. 1, in the container lid of the present invention, from the upper surface 30 of the locking projection 28 on the inner peripheral surface of the tamper-evident hem portion 16 when viewed in the vertical direction. It is important that a plurality of fitting portions 40 each having a fitting surface 38 whose inner diameter gradually increases upward are arranged at intervals in the circumferential direction with respect to each locking projection 28. .. In the illustrated embodiment, one fitting portion 40a having a relatively large circumferential width is arranged corresponding to each of the circumferential ends of the locking ridge 28, and the locking ridge 28 extends in the circumferential direction. A plurality of (three in the illustrated embodiment) fitting portions 40b having a relatively small circumferential width are provided corresponding to the central portion. Focusing on one locking projection 28, the circumferential intervals of the plurality of fitting portions 40 formed on the upper surface 30 of the locking projection 28 are equal. Each of the fitting surfaces 38 of the fitting portion 40 extends upward from the upper surface of the locking projection 28. Here, as shown in FIG. 3, the circumferential width of the fitting portion 40a having a relatively large circumferential width is d1, the circumferential width of the fitting portion 40b having a relatively small circumferential width is d2, and one locking protrusion is provided. The circumferential intervals of the plurality of fitting portions 40 formed on the upper surface 30 of the strip 28 are d3, and the fitting portions 40a adjacent to each other in the circumferential direction in the two locking projections 28 arranged adjacent to each other in the circumferential direction. If the circumferential interval of is d4, d1 = 3d2, d3 = 2d2, and d4 = d2. Each of the fitting surfaces 38 has an arcuate vertical cross-sectional shape, and the fitting surface 38 and the inner surface of the annular projection 36 are substantially flush with each other. If desired, the vertical cross-sectional shape of the fitting surface 38 may be linear, and the inner surface of the annular protrusion 36 may be located radially outside the fitting surface 38. Further, in the illustrated embodiment, the fitting surface 38 is a rough surface having an arithmetic mean roughness (Ra) defined in JIS B0601 of 2 to 20 μm.
図示の実施形態のように、係止突条２８の各々がタンパーエビデント裾部１６の内周面から半径方向内方に延出する上面３０、下方に向かって漸次内径が増大する下面３２、及び上面３０と下面３２との境界に位置する内面３４を有し、係止突条２８の周方向両端部においては上面３０の半径方向内方への延出長さが周方向両端に向かって漸次低減され及び／又は下面３２の下端が周方向両端に向かって漸次上方に変位している形態の場合、係止突条２８の両端部の剛性は低減されるが、係止突条２８の周方向両端部の各々に対応して周方向幅が比較的大きい１個の嵌合部４０ａが配設されていると、成形された容器蓋２を成形型から取り出す際における係止手段２７（係止突条２８）の両端部の無理抜きが、周方向幅が比較的大きい嵌合部４０ａの存在によって緩和され、成形された容器蓋を成形型から取り出す際に係止突条２８の両端部が変形されてしまうことが確実に回避される。 As in the illustrated embodiment, the locking projections 28 each have an upper surface 30 that extends radially inward from the inner peripheral surface of the tamper-evidence skirt 16, a lower surface 32 that gradually increases in inner diameter downward, And the inner surface 34 located at the boundary between the upper surface 30 and the lower surface 32, and the extending length of the upper surface 30 inward in the radial direction extends toward both ends in the circumferential direction at both ends in the circumferential direction of the locking projection 28. When the lower end of the lower surface 32 is gradually reduced and / or the lower end of the lower surface 32 is gradually displaced upward toward both ends in the circumferential direction, the rigidity of both ends of the locking projection 28 is reduced, but If one fitting portion 40a having a relatively large width in the circumferential direction is provided corresponding to each of both end portions in the circumferential direction, the locking means 27 (when the molded container lid 2 is taken out from the molding die) Forcibly removing both ends of the locking projection 28) is a fitting part with a relatively large circumferential width. Is mitigated by the presence of 0a, it is reliably avoided that both ends of the locking projections 28 when taking out the molded container closure from the mold from being deformed.
図１には容器蓋２と共に容器の口頸部４２も図示されている。ポリエチレンテレフタレートの如き適宜の合成樹脂、ガラス或いは金属薄板から形成することができる容器の口頸部４２は全体として円筒形状であり、口頸部４２の外周面には雄螺条４４と雄螺条４４の下方に位置する係止あご部４６が形成されている。係止あご部４６は下方に向かって外径が漸次増大する弧状の上面、円筒形状の外周面及び実質上水平に延在する下面を有する。口頸部４２の外周面には、更に、係止あご部４６の下方に位置するサポートリング４８（かかるサポートリング４８は当業者には周知の如く容器の搬送に利用される）も配設されている。 The container neck 2 as well as the container lid 2 are shown in FIG. The mouth / neck portion 42 of the container, which can be formed from an appropriate synthetic resin such as polyethylene terephthalate, glass or a thin metal plate, has a cylindrical shape as a whole, and a male thread 44 and a male thread are formed on the outer peripheral surface of the mouth / neck portion 42. A locking jaw 46 located below 44 is formed. The locking jaw 46 has an arcuate upper surface with an outer diameter gradually increasing downward, a cylindrical outer peripheral surface, and a lower surface extending substantially horizontally. On the outer peripheral surface of the mouth / neck portion 42, a support ring 48 located below the locking jaw portion 46 (the support ring 48 is used for transporting a container as well known to those skilled in the art) is also disposed. ing.
容器内に内容物を充填した後においては、通常、容器の口頸部４２に容器蓋２を装着するのに先立って、口頸部４２の外周面に上水でよい洗浄液を噴射して口頸部４２の外周面に付着した内容物を洗浄する。しかる後に、口頸部４２に容器蓋２を被嵌して容器蓋２を閉回転方向、図１において上方から見て時計方向、に回転せしめ、容器蓋２の雌螺条２４を口頸部４２の雄螺条４４に螺合せしめる。図１に示す状態まで雌螺条２４を雄螺条４４に螺合せしめると、容器蓋２の内側シール片８が口頸部４２内に侵入して口頸部４２の内周面に密接され、外側シール片１０が口頸部４２の外周面に密接乃至近接せしめられ、かくして口頸部４２が密封される。タンパーエビデント裾部１６の内周面に配設されている係止突条２８は口頸部４２の係止あご部４６を弾性的に（即ちタンパーエビデント裾部１６の弾性変形乃至変位によって）乗り越えて係止あご部４６の下方に位置する。かかる状態にあっては、図１と共に図２を参照することによって理解されるとおり、タンパーエビデント裾部１６の内周面における係止突条２８よりも上方の領域は、口頸部４２の係止あご部４６の外周面下端部に接触乃至密接せしめられる。そして、口頸部４２に容器蓋２を所要とおりに装着した後には、容器蓋２に上水でよい洗浄液を噴射し、次いで洗浄液の噴射に続いて空気でよい乾燥気体を容器蓋に噴射して洗浄水を除去する。容器の口頸部４２に噴射され口頸部４２に残留していた洗浄液は周方向に間隔をおいて配設された係止突条２８の間から流出する。 After the container is filled with the contents, normally, before the container lid 2 is attached to the mouth / neck portion 42 of the container, a cleansing water, which may be clean water, is sprayed onto the outer peripheral surface of the mouth / neck portion 42. The contents attached to the outer peripheral surface of the neck 42 are washed. Thereafter, the container lid 2 is fitted on the mouth / neck portion 42 and the container lid 2 is rotated in the closing rotation direction, that is, the clockwise direction when viewed from above in FIG. 1, and the female thread 24 of the container lid 2 is closed in the mouth / neck portion. The male thread 44 of 42 is screwed together. When the female thread 24 is screwed onto the male thread 44 to the state shown in FIG. 1, the inner sealing piece 8 of the container lid 2 enters the mouth / neck portion 42 and is brought into close contact with the inner peripheral surface of the mouth / neck portion 42. The outer sealing piece 10 is brought into close contact with or close to the outer peripheral surface of the mouth / neck portion 42, and thus the mouth / neck portion 42 is sealed. The locking projection 28 disposed on the inner peripheral surface of the tamper-evidence skirt 16 elastically locks the locking jaw 46 of the mouth / neck 42 (that is, by elastic deformation or displacement of the tamper-evident skirt 16). ) Beyond and located below the locking jaw 46. In this state, as can be understood by referring to FIG. 2 in addition to FIG. 1, the region of the inner peripheral surface of the tamper-evident hem portion 16 above the locking projection 28 is located in the mouth / neck portion 42. It is brought into contact with or in close contact with the lower end of the outer peripheral surface of the locking jaw 46. Then, after the container lid 2 is mounted on the mouth / neck portion 42 as required, a cleaning liquid that may be clean water is sprayed onto the container lid 2, and then a dry gas, which may be air, is sprayed onto the container lid following the spraying of the cleaning liquid. To remove the wash water. The cleaning liquid sprayed on the mouth / neck portion 42 of the container and remaining on the mouth / neck portion 42 flows out from between the locking projections 28 arranged at intervals in the circumferential direction.
内容物を消費するために口頸部４２を開封する際には、容器蓋２を開方向、即ち図１において上方から見て反時計方向、に回転せしめる。かくすると、雄螺条４４と雌螺条２４の螺合が漸次解除され、主部１４と共にタンパーエビデント裾部１６は上記回転と共に口頸部４２に対して上昇せしめられる。このとき、図２を参照することによって理解されるとおり、タンパーエビデント裾部１６に設けられた嵌合部４０の内面、つまり、係止突条２８の上面から上方に向かって内径が漸次増大する嵌合面３８が口頸部４２の係止あご部４６の外周面下端部に密接せしめられることで摩擦による抵抗トルクを生じることとなるが、本発明の容器蓋にあっては、嵌合部４０が周方向に連続して延在するのではなく、周方向に間隔をおいて複数個適宜配列されている故に、口頸部４２の係止あご部４６の外周面と嵌合部４０の嵌合面３８との接触面積が大幅に低減され、これに起因して上記ファーストトルクと上記セカンドトルクとの間の必要トルクは充分に低減される。容器蓋２が所定程度口頸部４２に対して上昇せしめられると、係止突条２８が係止あご部４６に係止せしめられ、タンパーエビデント裾部１６の軸線方向上方への移動は阻止される。これにより、破断ライン１２の橋絡部２０に応力が生成されることで橋絡部２０が破断され、タンパーエビデント裾部１６はスカート壁６の主部１４から切り離される。破断ライン１２が破断される際には、タンパーエビデント裾部１６に設けられた嵌合部４０の内面、つまり、係止突条２８の上面から上方に向かって内径が漸次増大する嵌合面３８が口頸部４２の係止あご部４６の外周面下端部に密接せしめられる故に、タンパーエビデント裾部１６の弾性的な変形乃至変位が抑制され、破断ライン１２が破断されることなく係止突条２８が係止あご部４６を乗り越えて上昇してしまうことが充分確実に回避される。破断ライン１２が破断された後においては、タンパーエビデント裾部１６を口頸部４２に残留せしめて、容器蓋２の天面壁４及びスカート壁６の主部１４は回転と共に軸線方向上方に自由に移動せしめられて口頸部４２から離脱され、かくして口頸部４２が開封される。所望ならば、タンパーエビデント裾部１６に軸線方向破断ラインを形成し、容器の口頸部４２を開封する際には上記軸線方向破断ラインが破断され、一方周方向に延在する破断ライン１２はその一部が破断されることなく維持され、タンパーエビデント裾部１６が無端環状から有端環状に展開され、タンパーエビデント裾部１６と共に容器蓋２の全体が口頸部４２から離脱されるようになすこともできる。 When opening the mouth / neck portion 42 to consume the contents, the container lid 2 is rotated in the opening direction, that is, the counterclockwise direction when viewed from above in FIG. As a result, the screw engagement between the male screw thread 44 and the female screw thread 24 is gradually released, and the tamper-evidence hem portion 16 together with the main portion 14 is raised with respect to the mouth / neck portion 42 with the above rotation. At this time, as will be understood by referring to FIG. 2, the inner diameter gradually increases from the inner surface of the fitting portion 40 provided on the tamper-evident hem portion 16, that is, the upper surface of the locking projection 28, toward the upper side. The fitting surface 38 to be brought into close contact with the lower end portion of the outer peripheral surface of the locking jaw portion 46 of the mouth / neck portion 42 causes resistance torque due to friction, but in the container lid of the present invention, Since the plurality of portions 40 do not extend continuously in the circumferential direction but are appropriately arranged at intervals in the circumferential direction, the outer peripheral surface of the locking jaw portion 46 of the mouth / neck portion 42 and the fitting portion 40. The contact area between the first torque and the second torque is significantly reduced, and as a result, the required torque between the first torque and the second torque is sufficiently reduced. When the container lid 2 is raised to the mouth / neck portion 42 to a predetermined degree, the locking ridge 28 is locked to the locking chin portion 46 to prevent the tamper-evidence hem portion 16 from moving upward in the axial direction. To be done. As a result, stress is generated in the bridging portion 20 of the breaking line 12, whereby the bridging portion 20 is broken, and the tamper-evidence hem portion 16 is separated from the main portion 14 of the skirt wall 6. When the breaking line 12 is broken, the inner surface of the fitting portion 40 provided on the tamper-evident hem portion 16, that is, the fitting surface whose inner diameter gradually increases from the upper surface of the locking ridge 28 upward. Since 38 is brought into close contact with the lower end portion of the outer peripheral surface of the locking jaw portion 46 of the mouth / neck portion 42, elastic deformation or displacement of the tamper-evident hem portion 16 is suppressed, and the break line 12 is not broken. The stop ridge 28 is sufficiently reliably prevented from climbing over the locking jaw 46. After the breaking line 12 is broken, the tamper-evidence hem 16 is left in the mouth / neck portion 42 so that the top wall 4 of the container lid 2 and the main portion 14 of the skirt wall 6 are free to move upward in the axial direction with rotation. And is separated from the mouth / neck portion 42, and thus the mouth / neck portion 42 is opened. If desired, an axial break line may be formed in the tamper-evidence skirt 16 to break the axial break line when opening the mouth neck 42 of the container, while the break line 12 extends in the circumferential direction. Is maintained without being partially broken, the tamper-evidence skirt 16 is expanded from an endless ring to an end ring, and the entire container lid 2 is separated from the mouth / neck part 42 together with the tamper-evidence skirt 16. You can also do so.
図１に示す合成樹脂製容器蓋にあっては、嵌合部４０の周方向両側面は径方向に直線状に延びており、嵌合面３８と嵌合部４０の周方向両側面とは垂直に接続されているが、嵌合面３８と嵌合部４０の周方向両側面とを曲線的に接続してもよい。嵌合面３８と嵌合部４０の周方向両側面とを曲線的に接続することで、容器蓋２が開方向に回転せしめられ、嵌合面３８が口頸部４２の係止あご部４６の外周面下端部に密接せしめられてこれに対して周方向に移動する際の両者間の摩擦抵抗が軽減される。上記摩擦抵抗は、嵌合面３８に穴部を適宜形成することでより一層軽減される。また、複数個配設された嵌合部４０の夫々の上端部は、上下方向に見て必ずしも周方向に整合している必要はない。更にまた、周方向に隣接する嵌合部４０の間には、内径が嵌合部４０よりも大きい補強部を適宜設けてもよい。 In the synthetic resin container lid shown in FIG. 1, both circumferential side surfaces of the fitting portion 40 extend linearly in the radial direction, and the fitting surface 38 and the circumferential both side surfaces of the fitting portion 40 are different from each other. Although they are connected vertically, the fitting surface 38 and the circumferentially opposite side surfaces of the fitting portion 40 may be connected in a curved manner. By connecting the fitting surface 38 and both circumferential side surfaces of the fitting portion 40 in a curved manner, the container lid 2 is rotated in the opening direction, and the fitting surface 38 is locked by the locking jaw portion 46 of the mouth / neck portion 42. The lower end portion of the outer peripheral surface of the above is closely contacted, and the frictional resistance between the two when moving in the circumferential direction is reduced. The frictional resistance is further reduced by appropriately forming a hole in the fitting surface 38. Further, the upper ends of the plurality of fitting portions 40 that are arranged do not necessarily need to be aligned in the circumferential direction when viewed in the vertical direction. Furthermore, a reinforcing portion having an inner diameter larger than that of the fitting portion 40 may be appropriately provided between the fitting portions 40 adjacent to each other in the circumferential direction.
次に本発明の他の局面に従って構成される合成樹脂製容器蓋について、図４を参照して説明する。ここで、本発明の他の局面に従って構成される容器蓋と、図１乃至図３に示す容器蓋とは、図１等に示す容器蓋のタンパーエビデント裾部に設けられた係止手段及び嵌合部を除いて同一であるため、本発明の他の局面に従って構成される容器蓋についての全体的な説明は省略し、係止手段及び嵌合部についてのみ説明することとする。 Next, a synthetic resin container lid constructed according to another aspect of the present invention will be described with reference to FIG. Here, the container lid configured according to another aspect of the present invention and the container lid shown in FIGS. 1 to 3 are a locking means provided at the tamper-evidence skirt of the container lid shown in FIG. Since they are the same except for the fitting portion, the overall description of the container lid constructed according to another aspect of the present invention will be omitted, and only the locking means and the fitting portion will be described.
図３と図４とを比較参照することによって理解されるとおり、本発明の他の局面に従って構成される容器蓋においては、係止手段２７´はタンパーエビデント裾部１６´の内周面において半径方向内方に突出し且つ周方向に連続して延在する環状係止突条２８´から構成されている。係止手段２７´をこのような環状係止突条２８´から構成しても、タンパーエビデント裾部１６´の内周面に、係止手段２７´の上面から上方に向かって内径が漸次増大する嵌合面３８´を有する嵌合部４０´を周方向に間隔をおいて複数個配設することで、口頸部の係止あご部の外周面と嵌合部の嵌合面との接触面積が大幅に低減され、これに起因して上記ファーストトルクと上記セカンドトルクとの間の必要トルクが充分に低減される。 As understood by comparing FIG. 3 and FIG. 4, in the container lid constructed according to another aspect of the present invention, the locking means 27 ′ is provided on the inner peripheral surface of the tamper-evident hem 16 ′. It is composed of an annular locking ridge 28 'which projects inward in the radial direction and extends continuously in the circumferential direction. Even if the locking means 27 'is constituted by such an annular locking ridge 28', the inner diameter is gradually increased from the upper surface of the locking means 27 'to the inner peripheral surface of the tamper-evident hem 16'. By disposing a plurality of fitting portions 40 ′ having increasing fitting surfaces 38 ′ at intervals in the circumferential direction, the outer circumferential surface of the locking jaw portion of the mouth and neck portion and the fitting surface of the fitting portion are formed. The contact area between the first torque and the second torque is sufficiently reduced.
２：容器蓋
４：天面壁
６：スカート壁
１２：破断ライン
１４：主部
１６：タンパーエビデント裾部
１８：スリット
２０：橋絡部
２４：雌螺条
２７：係止手段
２８：係止突条
３８：嵌合面
４０：嵌合部
2: Container lid 4: Top wall 6: Skirt wall 12: Break line 14: Main part 16: Tamper evidence hem 18: Slit 20: Bridge part 24: Female thread 27: Locking means 28: Locking protrusion Article 38: Fitting surface 40: Fitting part
Claims (5)
該タンパーエビデント裾部の内周面には、上下方向に見て該係止突条の上面から上方に向かって内径が漸次増大する嵌合面を有する嵌合部が、該係止突条の各々に対して周方向に間隔をおいて複数個配設されている、ことを特徴とする合成樹脂製容器蓋。 A circular top wall and a cylindrical skirt wall hanging down from the peripheral edge of the top wall, wherein the skirt wall has a plurality of slits extending in the circumferential direction at intervals in the circumferential direction and a plurality of slits existing between the slits. A rupture line extending in the circumferential direction is formed, and the skirt wall is divided into a main part above the rupture line and a tamper-evidence skirt below the rupture line. A female screw thread is formed on the inner peripheral surface of the main portion, and a plurality of locking members protruding inward in the radial direction and extending in the peripheral direction are formed on the inner peripheral surface of the tamper-evident skirt. In a synthetic resin container lid in which locking means composed of a ridge is provided,
On the inner peripheral surface of the tamper-evident skirt, a fitting portion having a fitting surface whose inner diameter gradually increases from the upper surface of the locking projection when viewed in the vertical direction is provided with the locking projection. A plurality of synthetic resin container lids are provided at intervals in the circumferential direction with respect to each of the.
該係止突条の該周方向両端部の各々に対応して周方向幅が比較的大きい１個の該嵌合部が配設され、該係止突条の周方向中央部に対応して周方向幅が比較的小さい少なくとも１個の該嵌合部が配設されている、請求項１記載の合成樹脂製容器蓋。 Each of the locking projections has an upper surface extending inward in the radial direction from the inner peripheral surface of the tamper-evident skirt, a lower surface whose inner diameter gradually increases downward, and a boundary between the upper surface and the lower surface. The inner surface of the locking protrusion is located at both ends in the circumferential direction, and the radially inward extending length of the upper surface is gradually reduced toward both ends in the circumferential direction and / or the lower end of the lower surface is It is gradually displaced upward toward both ends in the circumferential direction,
One fitting portion having a relatively large circumferential width is arranged corresponding to each of the both ends of the locking projection in the circumferential direction, and one fitting portion having a relatively large width in the circumferential direction is provided, corresponding to the central portion of the locking projection in the circumferential direction. The synthetic resin container lid according to claim 1, wherein at least one fitting portion having a relatively small circumferential width is provided.
該タンパーエビデント裾部の内周面には、該係止手段の上面から上方に向かって内径が漸次増大する嵌合面を有する嵌合部が、周方向に間隔をおいて複数個配設されている、ことを特徴とする合成樹脂製容器蓋。 A circular top wall and a cylindrical skirt wall hanging down from the peripheral edge of the top wall, wherein the skirt wall has a plurality of slits extending in the circumferential direction at intervals in the circumferential direction and a plurality of slits existing between the slits. A rupture line extending in the circumferential direction is formed, and the skirt wall is divided into a main part above the rupture line and a tamper-evidence skirt below the rupture line. An internal thread is formed on the inner peripheral surface of the main portion, and an annular engagement member that protrudes radially inward and continuously extends in the circumferential direction is formed on the inner peripheral surface of the tamper-evident skirt. In a synthetic resin container lid in which a locking means composed of a stop ridge is arranged,
On the inner peripheral surface of the tamper-evident skirt, a plurality of fitting portions having fitting surfaces whose inner diameter gradually increases from the upper surface of the locking means are arranged at intervals in the circumferential direction. The container lid made of synthetic resin characterized by being.
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| JP2018203523A JP7302959B2 (en) | 2018-10-30 | 2018-10-30 | Synthetic resin container lid |
| JP2023040403A JP2023063481A (en) | 2018-10-30 | 2023-03-15 | Synthetic resin container lid |
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| JP2018203523A JP7302959B2 (en) | 2018-10-30 | 2018-10-30 | Synthetic resin container lid |
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| JP2021050006A (en) * | 2019-09-24 | 2021-04-01 | 日本山村硝子株式会社 | Synthetic resin cap |
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| JP2013126881A (en) * | 2011-12-16 | 2013-06-27 | Nippon Closures Co Ltd | Synthetic resin container lid and combination of the same with container |
| CN203780992U (en) * | 2013-10-28 | 2014-08-20 | 赫斯基注射器成型系统有限公司 | Bottle cap for container |
| JP2015182802A (en) * | 2014-03-25 | 2015-10-22 | 日本クロージャー株式会社 | synthetic resin container lid |
| JP2016016900A (en) * | 2014-07-10 | 2016-02-01 | 日本クロージャー株式会社 | Synthetic resin container lid and combination of the same and container |
| JP2018150056A (en) * | 2017-03-10 | 2018-09-27 | 日本山村硝子株式会社 | Synthetic resin cap and container |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013126881A (en) * | 2011-12-16 | 2013-06-27 | Nippon Closures Co Ltd | Synthetic resin container lid and combination of the same with container |
| CN203780992U (en) * | 2013-10-28 | 2014-08-20 | 赫斯基注射器成型系统有限公司 | Bottle cap for container |
| JP2015182802A (en) * | 2014-03-25 | 2015-10-22 | 日本クロージャー株式会社 | synthetic resin container lid |
| JP2016016900A (en) * | 2014-07-10 | 2016-02-01 | 日本クロージャー株式会社 | Synthetic resin container lid and combination of the same and container |
| JP2018150056A (en) * | 2017-03-10 | 2018-09-27 | 日本山村硝子株式会社 | Synthetic resin cap and container |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2021050006A (en) * | 2019-09-24 | 2021-04-01 | 日本山村硝子株式会社 | Synthetic resin cap |
| JP7348789B2 (en) | 2019-09-24 | 2023-09-21 | 日本山村硝子株式会社 | Synthetic resin cap |
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| JP7302959B2 (en) | 2023-07-04 |
| JP2023063481A (en) | 2023-05-09 |
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