JP2020015558A - Synthetic resin container lid - Google Patents
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本発明は、タンパーエビデント特性を備えた合成樹脂製容器蓋、更に詳しくは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延びる破断ラインが形成されていて、スカート壁は周方向破断ラインよりも上方の主部と周方向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、スカート壁の主部の内周面には雌螺条が形成されており、タンパーエビデント裾部の内周面には周方向に間隔をおいて周方向に延びる複数個の係止突起が配設されている形態の合成樹脂製容器蓋に関する。 The present invention provides a synthetic resin container lid having a tamper-evident property, more specifically, a circular top wall and a cylindrical skirt wall hanging down from the periphery of the top wall, wherein the skirt wall has a break extending in a circumferential direction. A line is formed, and the skirt wall is divided into a main portion above the circumferential breaking line and a tamper-evident hem portion below the circumferential breaking line, and the inner peripheral surface of the main portion of the skirt wall is formed. Is formed with a female thread, and a plurality of locking projections extending in the circumferential direction are arranged at intervals in the circumferential direction on the inner circumferential surface of the tamper-evident hem. Related to container lid.
飲料用容器として、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され、円筒形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形成されている形態の容器が広く実用に供されている。そして、かような容器の口頸部に装着される容器蓋として、下記特許文献１及び２に開示されている如く、上述したとおりの形態の合成樹脂製容器蓋が採用されている。そして、かような容器蓋においては、成形に必要な合成樹脂材料量を低減して製造価格を低減するために、また軽量化のために、当業者には周知の如く、天面壁及びスカート壁の厚さを可及的に薄くすると共に、スカート壁の主部の内周面に形成されている雌螺条を、周方向に間隔をおいて配設された複数個の中断領域によって中断された複数個の雌螺条部によって構成している。 The beverage container is made of a suitable synthetic resin such as polyethylene terephthalate, glass or a thin metal plate. On the outer peripheral surface of the cylindrical mouth and neck, a male thread and a locking jaw located below the male thread are provided. Containers of the formed form are widely used in practice. As disclosed in Patent Literatures 1 and 2, a synthetic resin container lid having the above-described configuration is employed as a container lid attached to the mouth and neck of such a container. In such a container lid, as is well known to those skilled in the art, in order to reduce the amount of synthetic resin material necessary for molding to reduce the manufacturing cost and to reduce the weight, the top wall and the skirt wall are known. And the female thread formed on the inner peripheral surface of the main part of the skirt wall is interrupted by a plurality of interrupting regions arranged at intervals in the circumferential direction. And a plurality of female threads.
而して、本発明者等の経験によれば、上述したとおりの従来の容器蓋においては、タンパーエビデント裾部に成形不良が発生する虞があることが判明している。 Thus, according to the experience of the present inventors, it has been found that in the conventional container lid as described above, there is a possibility that a molding failure may occur at the tamper-evident foot portion.
本発明は上記事実に鑑みてなされたものであり、その主たる技術的課題は、成形に必要な合成樹脂材料の量を増大させることなくタンパーエビデント裾部の成形不良を可及的に回避することである。 The present invention has been made in view of the above facts, and its main technical problem is to avoid molding defects of the tamper-evident hem as much as possible without increasing the amount of synthetic resin material required for molding. That is.
本発明によれば、上記主たる技術的課題を達成するために、隣接する係止突起間に位置する係止突起非存在部の軸線方向上方には雌螺条部を存在せしめる。 According to the present invention, in order to achieve the above-mentioned main technical problem, a female thread portion is provided axially above a locking projection non-existing portion located between adjacent locking projections.
即ち、本発明によれば、上記主たる技術的課題を達成することができ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延びる破断ラインが形成されていて、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、該スカート壁の該主部の内周面には雌螺条が形成されており、該タンパーエビデント裾部の内周面には周方向に間隔をおいて周方向に延びる複数個の係止突起が配設されており、該雌螺条は周方向に間隔をおいて配設された複数個の中断領域によって中断された複数個の雌螺条部によって構成されている合成樹脂製容器蓋において、
隣接する該係止突起間に位置する係止突起非存在部の軸線方向上方には、該雌螺条部が存在する、
ことを特徴とする合成樹脂製容器蓋が提供される。
That is, according to the present invention, a synthetic resin container lid capable of achieving the main technical problem described above includes a circular top wall and a cylindrical skirt wall hanging down from the periphery of the top wall, A rupture line extending in the circumferential direction is formed in the skirt wall, and the skirt wall is divided into a main portion above the rupture line and a tamper-evident hem portion below the rupture line. A female screw thread is formed on the inner peripheral surface of the main portion, and a plurality of locking protrusions extending in the circumferential direction at intervals in the peripheral direction are arranged on the inner peripheral surface of the tamper-evident foot portion. The female screw is provided in a synthetic resin container lid constituted by a plurality of female screw portions interrupted by a plurality of interrupting regions arranged at intervals in the circumferential direction,
The female thread portion exists above the locking protrusion non-existing portion located between the adjacent locking protrusions in the axial direction.
A synthetic resin container lid is provided.
好ましくは、該係止突起は周方向に等間隔をおいて奇数であるＮ個配設されており、該係止突起の各々の周方向長さは同一であり、該雌螺条の該中断領域は周方向に等間隔をおいてＮの整数倍個配設されており、該係止突起非存在部の周方向中心は該雌螺条部の周方向中心と軸線方向において整合している。該係止突起の周方向中心は該雌螺条部の周方向中心と軸線方向において整合しているのが好適である。 Preferably, an odd number of N locking projections are arranged at equal intervals in the circumferential direction, the length of each locking projection in the circumferential direction is the same, and the interruption of the female thread is The regions are arranged at equal intervals in the circumferential direction and are an integral multiple of N, and the circumferential center of the non-locking protrusion-free portion is axially aligned with the circumferential center of the female thread portion. . It is preferable that the circumferential center of the locking projection is axially aligned with the circumferential center of the female thread portion.
本発明の合成樹脂製容器蓋によれば、成形に必要な合成樹脂材料の量を増大させることなくタンパーエビデント裾部の成形不良を可及的に回避することができる。 ADVANTAGE OF THE INVENTION According to the synthetic resin container lid of this invention, the molding failure of the tamper-evident hem part can be avoided as much as possible, without increasing the amount of synthetic resin materials required for shaping | molding.
以下、本発明に従って構成された合成樹脂製容器蓋の好適実施形態を図示している添付図面を参照して、更に詳述する。 Hereinafter, a preferred embodiment of a synthetic resin container lid constructed according to the present invention will be described in more 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円筒形状の内側シール片８と共に下方に垂下する比較的短い円筒形状の外側シール片１０が形成されている。内側シール片８と外側シール片１０との中間には環状突出部１２が形成されている。 Referring to FIG. 1, a container lid 2 which can be injection-molded or compression-molded from a suitable synthetic resin such as polyethylene or polypropylene has a circular top wall 4 and a cylindrical skirt hanging from the periphery of the top wall 4. And a wall 6. A relatively short cylindrical outer seal piece 10 hanging down along with a relatively long cylindrical inner seal piece 8 hanging down is formed on the inner peripheral edge of the inner surface of the top wall 4. An annular protrusion 12 is formed between the inner seal piece 8 and the outer seal piece 10.
スカート壁６には周方向に延びる破断ライン１４が形成されており、スカート壁６は破断ライン１４より上方の主部１６と破断ライン１４より下方のタンパーエビデント裾部１８とに区画されている。図示の実施形態においては、破断ライン１４は周方向に延びる複数個のスリット（切り溝）２０とスリット２０間に残留せしめられている複数個の橋絡部２２とから構成されており、タンパーエビデント裾部１８は複数個の橋絡部２２を介して主部１６に接続されている。 The skirt wall 6 is formed with a break line 14 extending in the circumferential direction. The skirt wall 6 is divided into a main portion 16 above the break line 14 and a tamper-evident hem portion 18 below the break line 14. . In the illustrated embodiment, the rupture line 14 is composed of a plurality of circumferentially extending slits (cut grooves) 20 and a plurality of bridging portions 22 remaining between the slits 20. The dent bottom 18 is connected to the main portion 16 via a plurality of bridge portions 22.
スカート壁６の主部２０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２４が形成されている。図１と共に図２及び図４を参照して説明を続けると、スカート壁６の主部１６の内周面には雌螺条２６が形成されている。図示の実施形態においては、約７２０度（２巻）に渡って延びる１条の雌螺条２６が形成されており、周方向のいずれの部位においても軸線方向下側に位置する下段雌螺条２６ａと軸線方向上側に位置する上段雌螺条２６ｂが存在する。下段雌螺条２６ａ及び上段雌螺条２６ｂの各々は、成形に必要な合成樹脂材料量の低減の見地から、周方向に間隔をおいて配設された複数個の中断領域２８ａ及び２８ｂ（後に言及する係止突起の数をＮとすると、中断領域２８ａ及び２８ｂの数はＮの整数倍、特に２Ｎ、であるのが好適である）によって中断された複数個の雌螺条部３０ａ及び３０ｂから形成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、下段雌螺条２６ａ及び上段雌螺条２６ｂの各々において、等間隔をおいて１０個の中断領域２８ａ及び２８並びに１０個の雌螺条部３０ａ及び３０ｂが配設されており、中断領域２８ａ及び２８ｂの各々の周方向長さは同一であり、雌螺条部３０ａ及び３０ｂの各々の周方向長さも同一である。下段雌螺条２６ａにおける中断領域２８ａの各々と上段雌螺条２６ｂにおける中断領域２８ｂの各々とは軸線方向に整合しており、従って下段雌螺条２６ａにおける雌螺条部３０ａの各々と上段雌螺条２６ｂにおける雌螺条部３０ｂの各々とも軸線方向に整合している。１条の雌螺条を形成することに代えて複数状の雌螺条を形成することもできる。この場合も、各雌螺条における中断領域の各々の周方向長さは同一であり、雌螺条部の周方向長さも同一であり、各雌螺条における中断領域の各々及び雌螺条部の各々は軸線方向に整合しているのが好適である。 On the outer peripheral surface of the main portion 20 of the skirt wall 6, there is formed a non-slip knurl 24 composed of irregularities which are present alternately in the circumferential direction. Referring to FIGS. 2 and 4 together with FIG. 1, a female thread 26 is formed on the inner peripheral surface of the main portion 16 of the skirt wall 6. In the illustrated embodiment, one female thread 26 extending over about 720 degrees (two turns) is formed, and the lower female thread located on the axially lower side in any part in the circumferential direction. There is an upper female screw thread 26b located on the upper side in the axial direction with the upper female thread 26b. Each of the lower internal thread 26a and the upper internal thread 26b is provided with a plurality of circumferentially spaced interrupted regions 28a and 28b (described later) from the viewpoint of reducing the amount of synthetic resin material necessary for molding. Assuming that the number of the engaging projections to be referred to is N, the number of the interrupted regions 28a and 28b is preferably an integral multiple of N, particularly preferably 2N. It is important that they are formed from In the illustrated embodiment, in each of the lower internal thread 26a and the upper internal thread 26b, ten interruption regions 28a and 28 and ten internal thread portions 30a and 30b are arranged at equal intervals. The circumferential length of each of the interruption regions 28a and 28b is the same, and the circumferential length of each of the female thread portions 30a and 30b is also the same. Each of the interrupted areas 28a in the lower female thread 26a and each of the interrupted areas 28b in the upper female thread 26b are axially aligned, and therefore each of the female threads 30a in the lower female thread 26a and the upper female thread are aligned. Each of the female thread portions 30b of the thread 26b is also axially aligned. Instead of forming one female thread, a plurality of female threads can be formed. Also in this case, the circumferential length of each of the interrupted regions in each of the female threads is the same, the circumferential length of the female screw portion is also the same, and each of the interrupted regions in each of the female threads and the female screw portion Are preferably axially aligned.
図１乃至図４を参照して説明を続けると、タンパーエビデント裾部１８の内周面には周方向に間隔をおいて奇数であるのが好適である複数個の係止突起３２が配設されている。図示の実施形態においては、周方向に等間隔をおいて５個の係止突起３２が配設されており、係止突起３２の各々は実質上同一であり、周方向中間部３２ａと共に周方向両側部３２ｂを有する。図２を参照することによって理解される如く、係止突起３２の各々の周方向中間部３２ａの直径方向反対側には係止突起３２が存在しない係止突起非存在部３４（かかる係止突起非存在部３４の各々には突出量が微小である弧状突条が配設されている）が位置する。図４を参照することによって明確に理解される如く、隣接する係止突起間に位置する係止突起非存在部３４の軸線方向上方には雌螺条部３０ａ及び３０ｂが存在することが重要であり、係止突起非存在部３４の周方向中心は雌螺条部３０ａ及び３０ｂの周方向中心と軸線方向において整合しているのが好ましい。そしてまた、係止突起３２の少なくとも周方向中間部３２ａの軸線方向上方には雌螺条部３０ａ及び３０ｂが存在し、係止突起３２の周方向中心は雌螺条部３０ａ及び３０ｂの周方向中心と軸線方向において整合しているのが好都合である。図示の実施形態においては、係止突起３２の周方向中間部３２ａと共に周方向両側部３２ｂの周方向内側端及び外側端も、雌螺条部３０ａ及び３０ｂの軸線方向下方に位置する。 Continuing with reference to FIGS. 1 to 4, the inner peripheral surface of the tamper-evident hem portion 18 is provided with a plurality of locking projections 32, which are preferably spaced oddly in the circumferential direction. Has been established. In the illustrated embodiment, five locking projections 32 are disposed at equal intervals in the circumferential direction, and each of the locking projections 32 is substantially the same, and is also formed in the circumferential direction together with the circumferential intermediate portion 32a. It has both sides 32b. As can be understood by referring to FIG. 2, a locking projection non-existing portion 34 in which the locking projection 32 does not exist on the diametrically opposite side of each circumferential intermediate portion 32 a of the locking projection 32 (such a locking projection). Each of the non-existent portions 34 is provided with an arc-shaped ridge having a very small protrusion amount). As clearly understood by referring to FIG. 4, it is important that the female thread portions 30a and 30b are present in the axial direction above the locking projection non-existing portion 34 located between the adjacent locking projections. In addition, it is preferable that the circumferential center of the locking projection non-existing portion 34 is axially aligned with the circumferential center of the female thread portions 30a and 30b. Further, the female thread portions 30a and 30b are present at least axially above the circumferential intermediate portion 32a of the locking projection 32, and the circumferential center of the locking projection 32 is the circumferential direction of the female thread portions 30a and 30b. Advantageously, it is axially aligned with the center. In the illustrated embodiment, together with the circumferential intermediate portion 32a of the locking projection 32, the circumferential inner and outer ends of the circumferential side portions 32b are located axially below the female thread portions 30a and 30b.
係止突起３２の各々は、半径方向内方に延出する係止上面３６、縦断面図において略半円弧形状である先端面３８及び下方に向かって半径方向外方に傾斜して延在する案内下面４０を有する。そして、周方向中間部３２ａにおける係止上面３６の半径方向突出長さは周方向両側部３２ｂにおける係止上面３６の半径方向突出長さよりも大きく設定されている。更に詳述すると、図２を参照することによって明確に理解されるとおり、図示の実施形態においては、周方向中間部３２ａにおいては係止上面３６の半径方向延出長さが周方向両側に向かって漸次低減されており、周方向両側部３２ｂにおいても係止上面３６の半径方向延出長さは周方向両側に向かって漸次低減されており、周方向両端においては実質上零である。そして、周方向両側部３２ｂの周方向内側端における係止上面３６の半径方向延出長さは周方向中央部３２ａの周方向両端における係止上面３６の半径方向延出長さと実質上同一である。図示の実施形態においては、係止突起３２の各々の案内下面４０の下縁は周方向中間部３２ａから周方向両側部３２ｂの一部（即ち周方向内側部）に渡って実質上水平に延在し、周方向両側部３２ｂの周方向外側部においては案内下面４０の下縁は周方向外側端に向かって軸線方向上方に傾斜せしめられている。 Each of the locking projections 32 has a locking upper surface 36 extending inward in the radial direction, a tip surface 38 having a substantially semicircular shape in a longitudinal sectional view, and a slanting radially outwardly extending downward. It has a guide lower surface 40. The length of the protrusion of the locking upper surface 36 in the radial direction intermediate portion 32a in the radial direction is set to be longer than the length of the protrusion of the locking upper surface 36 in the circumferential side portions 32b in the radial direction. More specifically, as can be clearly understood by referring to FIG. 2, in the illustrated embodiment, in the circumferential intermediate portion 32a, the radial extension length of the locking upper surface 36 is directed toward both sides in the circumferential direction. The radially extending length of the locking upper surface 36 is also gradually reduced toward both sides in the circumferential direction at the both side portions 32b in the circumferential direction, and is substantially zero at both ends in the circumferential direction. The radially extending length of the locking upper surface 36 at the circumferentially inner ends of the circumferential side portions 32b is substantially the same as the radially extending length of the locking upper surface 36 at both circumferential ends of the circumferential central portion 32a. is there. In the illustrated embodiment, the lower edge of each guide lower surface 40 of the locking projection 32 extends substantially horizontally from the circumferential intermediate portion 32a to a part of the circumferential side portions 32b (that is, the circumferential inner portion). The lower edge of the guide lower surface 40 is inclined upward in the axial direction toward the outer end in the circumferential direction on the outer side in the circumferential direction of the both side portions 32b in the circumferential direction.
周方向に見て上記係止突起３２が存在する領域においては、タンパーエビデント裾部１８の上部内面は係止突起３２の係止上面３６から軸線方向上方に向かって半径方向外方に若干の角度で傾斜している、換言すれば軸線方向上方に向かって内径が漸次増大されている傾斜内面４２である。一方、周方向に見て係止突起３２が存在しない係止突起非存在部３４においては、タンパーエビデント裾部１８の内面は傾斜することなく、傾斜内面４２よりも上方の部位と同一面をなしている。 In the region where the locking projection 32 is present in the circumferential direction, the upper inner surface of the tamper-evident hem 18 slightly extends radially outward from the locking upper surface 36 of the locking projection 32 upward in the axial direction. The inclined inner surface 42 is inclined at an angle, in other words, the inner diameter is gradually increased upward in the axial direction. On the other hand, in the locking projection non-existing portion 34 in which the locking projection 32 does not exist when viewed in the circumferential direction, the inner surface of the tamper-evident hem portion 18 is not inclined and is flush with the portion above the inclined inner surface 42. No.
而して、上述した如く、従来の容器蓋においては、タンパーエビデント裾部に成形不良が発生することがあった。然るに、本発明に従って構成された容器蓋２においては、上述したとおり隣接する係止突起間に位置する係止突起非存在部３４の軸線方向上方には雌螺条部３０ａ及び３０ｂが存在し、そしてまた係止突起３２の少なくとも周方向中間部３２ａの軸線方向上方には雌螺条部３０ａ及び３０ｂが存在する。それ故に、スカート壁６の主部１６からタンパーエビデント裾部１８における薄肉である係止突起非存在部３４或いは係止突起３２自体に材料樹脂が良好に流動し、タンパーエビデント裾部１８の成形不良が可及的に回避される。また、係止突起における成形不良の回避については、本発明者等は、成形された容器蓋を成形型から取り出す際に雌螺条部３０ａ及び３０ｂ並びに係止突起３２において所謂無理抜きが必要であるが、係止突起３２の少なくとも周方向中間部３２ａの軸線方向上方には雌螺条部３０ａ及び３０ｂが存在する場合は、雌螺条部３０ａ及び３０ｂにおける無理抜きに起因してスカート壁６が下方に向かって半径方向外方に強制され、これによって係止突起３２のおける無理抜きが緩和されることにも起因すると考えている。因みに、雌螺条部３０ａ及び３０ｂは、その形状に起因して無理抜きによる変形乃至損傷に対して比較的強い耐性を有するが、係止突起３２は、その形状に起因して無理抜きによる変形乃至損傷に対する耐性が比較的小さい。 Thus, as described above, in the conventional container lid, molding defects sometimes occurred at the tamper-evident hem. However, in the container lid 2 configured according to the present invention, as described above, the female thread portions 30a and 30b exist above the locking projection non-existing portion 34 positioned between the adjacent locking projections, Further, female thread portions 30a and 30b are present at least above the circumferential intermediate portion 32a of the locking projection 32 in the axial direction. Therefore, the material resin flows well from the main portion 16 of the skirt wall 6 to the thin locking projection non-existent portion 34 or the locking projection 32 itself in the tamper-evident hem 18, and the tamper-evident hem 18 Molding defects are avoided as much as possible. In order to avoid molding defects in the locking projections, the present inventors require that the female screw portions 30a and 30b and the locking projections 32 be so-called forced removal when removing the molded container lid from the mold. However, when the female screw portions 30a and 30b are present at least above the circumferential intermediate portion 32a of the locking projection 32 in the axial direction, the skirt wall 6 is not removed due to the forced removal of the female screw portions 30a and 30b. Is forcibly displaced radially outward toward the lower side, whereby the forcible removal of the locking projection 32 is reduced. Incidentally, the female thread portions 30a and 30b have relatively strong resistance to deformation or damage due to forced removal due to their shapes, but the locking projections 32 are deformed due to forced removal due to their shapes. Or relatively low resistance to damage.
図１には容器蓋２と共に容器の口頸部４４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４４は全体として円筒形状であり、口頸部４４の外周面には約７２０度（２巻）に渡って延びる１条の雄螺条４６、即ち軸線方向下側に位置する下段雄螺条４６ａと軸線方向上側に位置する上段雄螺条４６ｂが存在する。また、下段雄螺条４６ａの下方に位置する係止あご部４８が形成されている。口頸部４４の外周面には、更に、係止あご部４８の下方に位置するサポートリング５０（かかるサポートリング５０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。 FIG. 1 also shows the mouth and neck 44 of the container together with the container lid 2. The mouth-and-neck portion 44 of the container which can be formed of a suitable synthetic resin such as polyethylene terephthalate, glass or a metal thin plate has a cylindrical shape as a whole, and the outer peripheral surface of the mouth-and-neck portion 44 has about 720 degrees (two turns). There is a single male thread 46 extending across, that is, a lower male thread 46a located on the lower side in the axial direction and an upper male thread 46b located on the upper side in the axial direction. A locking jaw 48 is formed below the lower male thread 46a. On the outer peripheral surface of the mouth-neck portion 44, there is further provided a support ring 50 located below the locking jaw 48 (the support ring 50 is used for transporting the container as is well known to those skilled in the art). ing.
容器内に内容物を充填した後に口頸部４４に容器蓋２を装着して口頸部４４を密封する際には、口頸部４４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２６を口頸部４４の雄螺条４６に螺合せしめる。図１に示す状態まで雌螺条２６を雄螺条４６に螺合せしめると、容器蓋２の内側シール片８が口頸部４４内に侵入して口頸部４４の内周面に密接され、環状突出部１２が口頸部４４の頂面に密接せしめられ、外側シール片１０が口頸部４４の外周面に密接乃至近接せしめられ、かくして口頸部４４が密封される。 When the container lid 2 is attached to the mouth and neck portion 44 to seal the mouth and neck portion 44 after the contents are filled in the container, the container lid 2 is fitted to the mouth and neck portion 44 and the container lid 2 is closed. The female screw 26 of the container lid 2 is screwed into the male screw 46 of the mouth-neck portion 44 by rotating the female screw 26 in the rotation direction, that is, clockwise as viewed from above in FIG. When the female thread 26 is screwed into the male thread 46 until the state shown in FIG. 1, the inner sealing piece 8 of the container lid 2 penetrates into the mouth and neck portion 44 and comes into close contact with the inner peripheral surface of the mouth and neck portion 44. The annular projection 12 is brought into close contact with the top surface of the mouth and neck 44, and the outer sealing piece 10 is brought into close or close proximity to the outer peripheral surface of the mouth and neck 44, thus sealing the mouth and neck 44.
口頸部４４に容器蓋２を装着して口頸部４４を密封する際には、タンパーエビデンド裾部１８の内周面に配設されている係止突起３２は口頸部４４の係止あご部４８を弾性的に乗り越え、係止あご部４８の下方に位置せしめられる。この際には係止突起３２の案内下面４０の案内作用によって係止突起３２は漸次半径方向外方に変位せしめられて円滑に係止あご部４８を乗り越える。そして、係止突起３２の各々の係止上面３６の周方向全体ではなくて周方向中間部３２ａのみにおいて係止上面３６の半径方向内方への延出長さが比較的大きく設定されている故に、係止突起３２が係止あご部４８を弾性的に乗り越える際に破断ライン１４が偶発的に破断されてしまうことが可及的に回避される。 When the container lid 2 is attached to the mouth-neck portion 44 to seal the mouth-neck portion 44, the locking projections 32 provided on the inner peripheral surface of the tamper-evident hem 18 are engaged with the mouth-neck portion 44. The chin 48 is elastically passed over and is positioned below the locking chin 48. At this time, the locking projection 32 is gradually displaced radially outward by the guiding action of the guide lower surface 40 of the locking projection 32, and smoothly passes over the locking jaw 48. The extension length of the locking upper surface 36 in the radially inward direction is set to be relatively large only in the circumferential intermediate portion 32a, not in the entire circumferential direction of each locking upper surface 36 of the locking protrusion 32. Therefore, accidental breakage of the breaking line 14 when the locking projection 32 elastically crosses the locking jaw 48 can be avoided as much as possible.
内容物を消費するために口頸部４４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４６と雄螺条雌２６の螺合が漸次解除され、スカート壁６の主部１６は回転と共に軸線方向上方に移動せしめられる。一方、タンパーエビデント裾部１８は係止突起３２が係止あご部４８に係止せしめられる故に軸線方向上方への移動が阻止され、かくして破断ライン１４の橋絡部２２に応力が生成されて橋絡部２２が破断され、タンパーエビデント裾部１８がスカート壁６の主部１６から切り離される。破断ライン１４が破断された後においては、タンパーエビデント裾部１８を口頸部４４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１６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４４から離脱され、かくして口頸部４４が開封される。所望ならば、タンパーエビデント裾部１８に軸線方向破断ラインを形成し、容器の口頸部４４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１４はその一端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１８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１８と共に容器蓋２の全体が口頸部４４から離脱されるようになすこともできる。 When opening the mouth and neck portion 44 to consume the contents, the container lid 2 is rotated in the opening direction, that is, in the counterclockwise direction as viewed from above in FIG. Then, the screw engagement between the male thread 46 and the male thread female 26 is gradually released, and the main part 16 of the skirt wall 6 is moved upward in the axial direction with rotation. On the other hand, the tamper-evident hem 18 is prevented from moving upward in the axial direction because the locking projection 32 is locked by the locking jaw 48, and thus the stress is generated in the bridge portion 22 of the breaking line 14. The bridging portion 22 is broken, and the tamper-evident hem 18 is separated from the main portion 16 of the skirt wall 6. After the breaking line 14 is broken, the tamper-evident hem 18 remains on the mouth and neck 44, and the top wall 4 of the container lid 2 and the main part 16 of the skirt wall 6 are free to rotate upward in the axial direction with rotation. The mouth and neck 44 is removed from the mouth and neck 44, and the mouth and neck 44 is thus opened. If desired, an axial break line is formed in the tamper-evident skirt 18 so that when opening the mouth and neck 44 of the container, the axial break line is broken, while the circumferential break line 14 Is maintained without breaking one end thereof, the tamper-evident hem 18 is expanded from an endless annular shape to an endless annular shape, and the entire container lid 2 is detached from the mouth and neck portion 44 together with the tamper-evident hem 18. You can do something like that.
２：容器蓋
４：天面壁
６：スカート壁
１４：破断ライン
１６：スカート壁の主部
１８：タンパーエビデント裾部
２２：橋絡部
２６：雌螺条
２６ａ：下段雌螺条
２６ｂ：上段雌螺条
２８ａ：下段雌螺条の中断領域
２８ｂ：上段雌螺条の中断領域
３０ａ：雌螺条部
３０ｂ：雌螺条部
３２：係止突起
３２ａ：係止突起の周方向中間部
３２ｂ：係止突起の周方向両側部
３４：係止突起非存在部
３６：係止突起の係止上面
４４：口頸部
４６：雄螺条
４６ａ：下段雄螺条
４６ｂ：上段雄螺条
４８：係止あご部
2: Container lid 4: Top wall 6: Skirt wall 14: Break line 16: Main part of skirt wall 18: Tamper evidence bottom 22: Bridge 26: Female thread 26a: Lower female thread 26b: Upper female Screw 28a: Interruption area of lower female screw 28b: Interruption area of upper female screw 30a: Female screw part 30b: Female screw part 32: Locking projection 32a: Peripheral middle part of locking projection 32b: Both sides in the circumferential direction of the stop projection 34: Non-existence portion of the lock projection 36: Lock upper surface of the lock protrusion 44: Mouth neck 46: Male screw 46a: Lower male screw 46b: Upper male screw 48: Lock Chin
Claims (3)
隣接する該係止突起間に位置する係止突起非存在部の軸線方向上方には、該雌螺条部が存在する、
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 from the periphery of the top wall are provided with a break line extending in a circumferential direction, and the skirt wall is formed above a main line above the break line. Portion and a tamper-evidence hem portion below the break line, and a female thread is formed on the inner peripheral surface of the main portion of the skirt wall, and the tamper-evidence hem portion is formed. A plurality of locking projections extending in the circumferential direction are arranged on the inner peripheral surface at intervals in the circumferential direction, and the female thread is provided in a plurality of interruption regions arranged at intervals in the circumferential direction. In a synthetic resin container lid constituted by a plurality of female threads interrupted by
The female thread portion exists above the locking protrusion non-existing portion located between the adjacent locking protrusions in the axial direction.
A container lid made of synthetic resin, characterized in that:
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| JP2019198459A JP2020015558A (en) | 2019-10-31 | 2019-10-31 | Synthetic resin container lid |
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| Application Number | Priority Date | Filing Date | Title |
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| JP2019198459A JP2020015558A (en) | 2019-10-31 | 2019-10-31 | Synthetic resin container lid |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2016097041A Division JP6775996B2 (en) | 2016-05-13 | 2016-05-13 | Synthetic resin container lid |
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| Publication Number | Publication Date |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008239184A (en) * | 2007-03-27 | 2008-10-09 | Japan Crown Cork Co Ltd | Resin-made container lid having tamper-evident property |
| JP2011143942A (en) * | 2010-01-15 | 2011-07-28 | Japan Crown Cork Co Ltd | Synthetic resin container lid and combination of the lid and container |
| JP2015093704A (en) * | 2013-11-12 | 2015-05-18 | 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 |
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2019
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008239184A (en) * | 2007-03-27 | 2008-10-09 | Japan Crown Cork Co Ltd | Resin-made container lid having tamper-evident property |
| JP2011143942A (en) * | 2010-01-15 | 2011-07-28 | Japan Crown Cork Co Ltd | Synthetic resin container lid and combination of the lid and container |
| JP2015093704A (en) * | 2013-11-12 | 2015-05-18 | 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 |
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