JP2004051126A

JP2004051126A - Highly sealable cap by low opening/closing torque

Info

Publication number: JP2004051126A
Application number: JP2002207871A
Authority: JP
Inventors: Kiyoshi Wada; 和田　潔; Shinji Kaneyuki; 金行　伸二; Kiyoshi Sawada; 沢田　清志; Takashi Saito; 齋藤　剛史; Norio Hayashida; 林田　徳生
Original assignee: Toppan Printing Co Ltd
Current assignee: Toppan Inc
Priority date: 2002-07-17
Filing date: 2002-07-17
Publication date: 2004-02-19
Anticipated expiration: 2022-07-17
Also published as: JP4539010B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highly sealable cap by a low opening/closing torque which can be screwed with a discharging port of a container by a low closing torque, and can be unscrewed by a low opening torque at the time of use, and in addition, of which the sealability to the discharging port of the container is good, and also, which can be used even for a discharging port made of a material having a low rigidity. <P>SOLUTION: This cap 100 is screwed with the discharging port 200 made of a plastic of the container 20. An inner sealing ring 101 which closely joins the outer peripheral surface to the inner peripheral surface of the distal end part of the discharging port of the container is provided on the lower surface of a top board 110 of the cap. A contact sealing ring 102 of which the lower distal end closely joins to the upper surface of the discharging port of the container is provided in a manner to be adjacent to the upper end of the outer periphery of the inner sealing ring. Also, an outer contact ring 103 is provided with a gap to the outer periphery of the upper end of the discharging port of the container, at the upper end of the inner peripheral surface of the peripheral wall of the cap. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、液体紙容器の注出位置に突設する剛性が比較的に低い材質のスパウトに螺着する低開閉トルクで高密封なキャップに関するものである。
【０００２】
【従来の技術】
従来、食品や非食品などの液体内容物に使用する容器には、使用時の使い易さを考慮して、例えば、図５に示すように、胴部（２１）が四角柱状で、切り妻屋根形の頂部傾斜板（２２）の注出位置に、キャップ（１００）とスパウトとからなる口栓（１０）を突設した液体用紙容器（２０）が、広い用途範囲にわたって使用されていた。この口栓（１０）のキャップ（１００）としては、特に密封性が要求される場合には、例えば、図６に示すように、キャップ（１００）の天板（１１０）下面に、外周面をスパウト（２００）の注出筒（２２０）の先端部内周面に密接するインナー封止リング（１０１）と、このインナー封止リングの外側に、スパウトの注出筒の先端上面に先端を密接するコンタクト封止リング（１０２）とを垂設し、また、内周面をスパウトの注出筒の先端部外周面に密接するアウター封止リング（１０４）をキャップの周壁（１２０）の上端部内周面に内側へ突設して、スパウトの注出筒の上端部の三箇所を封止するものが使用されていた。
【０００３】
【発明が解決しようとする課題】
しかしながら、上述の従来の口栓のキャップは、スパウト（注出口部）の注出筒の上端部の三箇所を封止することから、キャップをスパウトに螺着するときに、強い閉めトルクを必要とし、従って、キャップをスパウトから螺脱するときに、強い開けトルクを必要とし使用時に使用しにくいことがあった。なお、このキャップの封止過程は、まず、容器の注出口部の上端部内周面にインナー封止リングの外周面が密接し、次に、容器の注出口部の上面にコンタクト封止リングの下端先端を密接し、次に、キャップの螺着にともなう周壁の変形により容器の注出口部の先端部外周面にアウター封止リングの内周面を密接するものであった。また、容器の注出口部の材質の剛性が低い場合（曲げ弾性率が１，０００ＭＰａ以下）には、注出口部の閉めトルクによる倒れに起因する密封性の問題を生じることがあった。
【０００４】
本発明は、上述の従来のキャップの問題を解決したものであり、容器の注出口部に低い閉じトルクで螺着でき、使用時に低い開けトルクで螺脱でき、しかも容器の注出口部への封止性が良好で、また、剛性が低い材質の注出口部にも使用できる低開閉トルクで高密封なキャップを提供するものである。
【０００５】
【課題を解決するための手段】
すなわち、本発明の第１の発明は、容器のプラスチック製の注出口部に螺着するキャップであって、前記キャップの天板下面に、前記容器の注出口部の先端部内周面に外周面を密接するインナー封止リングを設け、このインナー封止リングの外周上端に隣接して、下端先端を前記容器の注出口部の上面に密接するコンタクト封止リングを設け、かつ前記キャップの周壁内周面の上端部に、前記容器の注出口部の上端部外周と隙間を設けてアウター当接リングを設けたことを特徴とする低開閉トルクで高密封なキャップである。
【０００６】
次に、本発明の第２の発明は、前記インナー封止リングが、外周面に前記容器の注出口部の上端部内周面と密接する垂直線に対する角度が０〜１０°の上方開きの斜面を有することを特徴とする第１の発明に記載の低開閉トルクで高密封なキャップである。
【０００７】
次に、本発明の第３の発明は、前記インナー封止リングの外周面の前記容器の注出口部の上端部内周面と密接する高さが、前記キャップを前記容器の注出口部に螺着ときの螺合回転角度で２０°〜６０°相当にすることを特徴とする第１又は第２の発明に記載の低開閉トルクで高密封なキャップである。
【０００８】
次に、本発明の第４の発明は、前記コンタクト封止リングが、高さが０．３〜１．０ｍｍの断面倒立三角形状で、下端の先端角度が３０〜９０°であること特徴とする第１乃至第２の発明に記載の低開閉トルクで高密封なキャップである。
【０００９】
そして、本発明の第５の発明は、前記アウター当接リングと前記容器の注出口部の上端部外周との隙間が、前記キャップの雌ネジの先端と前記容器の注出口部の雄ネジの谷との間隔の±０．３ｍｍであることを特徴とする第１乃至第３の発明に記載の低開閉トルクで高密封なキャップである。
【００１０】
【発明の実施の形態】
本発明の低開閉トルクで高密封なキャップは、容器のプラスチック製の注出口部に螺着するキャップであり、液体用紙容器の口栓のキャップや、剛性の低い材質（曲げ弾性率が１，０００ＭＰａ以下）、例えばスクイズボトル（胴部をスクイズして内容物を押し出すマヨネーズボトルなど）のキャップなど使用するものであり、キャップの天板下面に、容器の注出口部の先端部内周面に外周面を密接するインナー封止リングを設け、このインナー封止リングの外周上端に隣接して、下端先端を容器の注出口部の上面に密接するコンタクト封止リングを設け、そして、キャップの周壁内周面の上端部に、容器の注出口部の上端部外周と所定の隙間をもつアウター当接リングを設けるものである。このキャップは、ポリプロピレンなどの適度の剛性をもつ熱可塑性樹脂を用いて、射出成形法により作製するものである。
【００１１】
次に、本発明の低開閉トルクで高密封なキャップの実施の形態について、図を用いて詳細に説明する。
図１は、本発明の一実施形態のキャップを、液体用紙容器の注出位置に突設するスパウトに螺着したときの断面図である。図２（ａ）は、そのキャップのインナー封止リングの容器の注出口部内周面と密着する密着部分の形状を示す断面図であり、図２（ｂ）は、コンタクト封止リングの形状を示す断面図である。図３は、キャップのアウター当接リングと容器の注出口部の上端部外周面との間隔を示す説明図である。図４は、キャップを容器の注出口部に螺着したときに、強い閉めトルクにより容器の注出口部が外側へ倒れてキャップのアウター当接リングに当接したときの状態を示す説明図である。そして、図５は、一例の口栓付液体紙容器の斜視図である。
【００１２】
本発明の一実施形態のキャップ（１００）は、図１に示すように、液体用紙容器（２０）の頂部傾斜板（２２）の注出位置に突設するスパウト（注出口部）（２００）に螺着するキャップ（１００）であり、その構造は、天板（１１０）下面に、スパウトの注出筒（２２０）の先端部内周面に外周面を密接するインナー封止リング（１０１）を設け、このインナー封止リングの外周上端に隣接して、下端先端をスパウトの注出筒の上面に密接するコンタクト封止リング（１０２）を設け、そして、キャップの周壁（１２０）内周面の上端部に、スパウトの注出筒の上端部外周と所定の隙間をもつアウター当接リング（１０３）を設けるものである。また、アウター当接リングの下方のキャップの周壁内周面にスパウトの雄ネジ（２２１）と螺合する雌ネジ（１２１）を設けるものである。
【００１３】
そして、上述のインナー封止リング（１０１）は、図２（ａ）に示すように、外周面に容器の注出口部の上端部内周面と密接する垂直線に対する角度（α°）が０〜１０°の上方開きの斜面を有するものである。なお、斜面の垂直線に対する角度を１０°以上にすると、容器の注出口部の上端部内周面と密接度が極度に大きくなり、閉めトルクが異常に高いなる。
【００１４】
また、図２（ａ）に示すように、インナー封止リング（１０１）の外周面の容器の注出口部の上端部内周面と密接する高さ（Ｈ）は、キャップを容器の注出口部に螺着ときの螺合回転角度で２０°〜６０°相当にする高さにするものである。なお、螺合回転角度で２０°以下の高さでは、容器の注出口部の上端部内周面と密接度が不足し、螺合回転角度で６０°以上の高さでは、容器の注出口部の上端部内周面との密接度が必要以上となり、閉めトルクが高くなる。
【００１５】
また、図２（ｂ）に示すように、コンタクト封止リング（１０１）は、高さ（ｈ）が０．３〜１．０ｍｍの断面倒立三角形状で、下端の先端角度（β°）を３０〜９０°の鋭角にするものである。なお、高さが０．３ｍｍ以下では、封止効果が悪くなり、１．０ｍｍ以上の高さは封止効果及び構造上からみて必要ない。また、先端角度が３０°以下では、腰がなく密接度が低下し、９０°以上では、閉めトルクの状態に追従しての変化がしにくくなり、封止性が損なわれる。
【００１６】
また、図３び示すアウター当接リング（１０３）とスパウト（２００）の注出筒（２２０）の上端部外周との隙間（Ｄ）は、キャップ（１００）の雌ネジ（１２１）の先端とスパウトの注出筒の雄ネジ（２２１）の谷との間隔（ｄ）の±０．３ｍｍに設けるものである。なお、キャップの雌ネジの先端とスパウトの雄ネジの谷との間隔（ｄ）の−０．３ｍｍ以下では、アウター当接リングとスパウトの注出筒の上端部外周とに隙間を設ける効果がなく、＋０．３ｍｍ以上にすると、注出筒の上端部が外側へ倒れたりときに、インナー封止リングやコンタクト封止リングの封止効果が阻害されたり、雄ネジと雌ネジとの密接度が大きくなり、使用時の開けトルクが高くなったり、ネジ山の接触面に摩擦によりむしれを生じたりする。
【００１７】
上述した本実施形態のキャップは、図１に示すように、天板下面に、インナー封止リングとその外側に隣接してコンタクト封止リングを設け、周壁内周面の上端部に、スパウトの注出筒の上端部外周と隙間を設けてアウター当接リングが設けられており、比較的に剛性が低い材質のスパウトにキャップを螺着するときに、閉めトルクによりスパウトの注出筒の上端部が外側へ倒れても、キャップの周壁内周面の上端部に設けられているアウター当接リングに当接して停止し、それ以上に倒れることがない。このため、キャップがスパウトの注出筒に必要以上に螺合されることがなく、従って、使用時の開けトルクも適正なものとなる。また、少なくともコンタクト封止リングがスパウトの注出筒の上端部天面との密接を維持しているので、キャップのスパウトに対する封止効果も良好となる。また、キャップの雌ネジとスパウトの雄ネジとの接触面での過度な摩擦も防げる。
【００１８】
【発明の効果】
本発明のキャップは、天板下面に容器の注出口部と密接する適正な形状のインナー封止リングとコンタクト封止リングとが設けられており、また、容器の注出口部の上端部外周と適正な間隔をもつアウター当接リングが設けられており、これらの相乗効果により、低開閉トルクで高密封なキャップである。また、このキャップは、容器の注出口部の材質が比較的に剛性が低い場合にも使用することができる。
【図面の簡単な説明】
【図１】本発明の一実施形態のキャップを、液体用紙容器の注出位置に突設するスパウトに螺着したときの断面図である。
【図２】（ａ）は、図１に示す本発明のキャップのインナー封止リングの容器の注出口部内周面と密着する密着部分の形状を示す断面図であり、（ｂ）は、コンタクト封止リングの形状を示す断面図である。
【図３】図１に示す本発明のキャップのアウター当接リングと容器の注出口部の上端部外周面との間隔を示す説明図である。
【図４】図１に示す本発明のキャップを容器の注出口部に螺着したときに、強い閉めトルクにより容器の注出口部が外側へ倒れてキャップのアウター当接リングに当接したときの状態を示す説明図である。
【図５】一例の口栓付液体紙容器の斜視図である。
【図６】従来の一例のキャップを、液体用紙容器の注出位置に突設するスパウトに螺着したときの断面図である。
【符号の説明】
１０……口栓
２０……液体用紙容器
２１……胴部
２２……頂部傾斜板
１００……キャップ
１０１……インナー封止リング
１０２……コンタクト封止リング
１０３……アウター当接リング
１０４……アウター封止リング
１１０……天板
１２０……周壁
１２１……雌ネジ
２００……スパウト又は注出口部
２１０……台座リング
２２０……注出筒
２２１……雄ネジ
２３０……閉鎖板
２３１……環状切込み
２３２……環状薄肉脆弱線
２３３……支柱
２３４……プルリング
２４０……貼着リング
α°，β°……角度
Ｈ，ｈ……高さ[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a cap with a low opening / closing torque and a high seal that is screwed to a spout made of a material having relatively low rigidity and protruding from a pouring position of a liquid paper container.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, containers used for liquid contents such as foods and non-foods have been designed in consideration of ease of use, for example, as shown in FIG. A liquid paper container (20) in which a spout (10) comprising a cap (100) and a spout protrudes from a pouring position of a roof-shaped top inclined plate (22) has been used over a wide range of applications. When the cap (100) of the plug (10) is particularly required to have a tight seal, for example, as shown in FIG. 6, an outer peripheral surface is provided on the lower surface of the top plate (110) of the cap (100). An inner sealing ring (101) that is in close contact with the inner peripheral surface of the tip of the spout cylinder (220) of the spout (200), and the tip is in close contact with the upper surface of the tip of the spout dispensing cylinder outside the inner sealing ring. A contact seal ring (102) is vertically provided, and an outer seal ring (104) whose inner peripheral surface is in close contact with the outer peripheral surface of the tip end portion of the spout discharging cylinder is connected to the inner peripheral portion of the upper end portion of the peripheral wall (120) of the cap. One that protrudes inward on the surface and seals three places at the upper end of the spout pouring cylinder has been used.
[0003]
[Problems to be solved by the invention]
However, the above-mentioned conventional cap of a spout seals the upper end of the spout (pouring port) at the upper end of the spout cylinder, so a strong closing torque is required when the cap is screwed onto the spout. Therefore, when the cap is unscrewed from the spout, a strong opening torque is required, and it is sometimes difficult to use the cap during use. Note that, in the sealing process of the cap, first, the outer peripheral surface of the inner sealing ring is in close contact with the inner peripheral surface of the upper end portion of the container outlet, and then the contact sealing ring is attached to the upper surface of the container outlet. The lower end tip is brought into close contact, and then the inner peripheral surface of the outer sealing ring is brought into close contact with the outer peripheral surface of the distal end portion of the outlet of the container due to deformation of the peripheral wall accompanying the screwing of the cap. When the rigidity of the material of the spout of the container is low (the flexural modulus is 1,000 MPa or less), there may be a problem in the sealing performance due to the collapse of the spout due to the closing torque.
[0004]
The present invention solves the above-mentioned problem of the conventional cap, and can be screwed into the spout of the container with a low closing torque, can be unscrewed with a low opening torque in use, and furthermore, can be screwed into the spout of the container. An object of the present invention is to provide a cap that has a good sealing property, a low opening / closing torque, and a high hermetic seal that can be used for a spout made of a material having low rigidity.
[0005]
[Means for Solving the Problems]
That is, a first invention of the present invention is a cap which is screwed to a plastic spout of a container, and has an outer peripheral surface on an inner peripheral surface of a tip part of the spout on the lower surface of a top plate of the cap. A contact sealing ring is provided adjacent to the upper end of the outer periphery of the inner sealing ring, the lower end of the inner sealing ring is in close contact with the upper surface of the spout of the container, and the inner peripheral wall of the cap is provided. A cap with low opening / closing torque and high sealing, wherein an outer contact ring is provided at the upper end of the peripheral surface with a gap with the outer periphery of the upper end of the spout of the container.
[0006]
Next, a second invention of the present invention is directed to a slope in which the inner sealing ring is upwardly open at an angle of 0 to 10 ° with respect to a vertical line on an outer peripheral surface thereof which is in close contact with an inner peripheral surface of an upper end portion of the spout of the container. The cap according to the first aspect, wherein the cap has a low opening / closing torque and a high seal.
[0007]
Next, a third invention of the present invention is directed to a third aspect of the present invention, wherein the height of the outer peripheral surface of the inner sealing ring in close contact with the inner peripheral surface of the upper end portion of the spout of the container is such that the cap is screwed into the spout of the container. The cap according to the first or second aspect of the present invention, characterized in that the screwing rotation angle at the time of wearing is equivalent to 20 ° to 60 °, and the opening / closing torque is low and the sealing is high.
[0008]
Next, a fourth invention of the present invention is characterized in that the contact sealing ring has an inverted triangular cross section with a height of 0.3 to 1.0 mm and a tip angle of a lower end of 30 to 90 °. A low sealing torque and high sealing cap according to the first and second aspects of the present invention.
[0009]
In the fifth invention of the present invention, the gap between the outer abutment ring and the outer periphery of the upper end portion of the spout of the container is formed between the tip of the female screw of the cap and the male screw of the spout of the container. The cap having a low opening / closing torque and a high hermetic seal according to any one of the first to third aspects of the present invention, wherein the gap between the cap and the valley is ± 0.3 mm.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
The cap with low opening / closing torque and high sealing according to the present invention is a cap which is screwed into a plastic spout of a container, and is a cap for a stopper of a liquid paper container or a material having low rigidity (a bending elastic modulus of 1 or less). 000MPa or less), for example, a cap for a squeeze bottle (a mayonnaise bottle for squeezing the body and extruding the contents). An inner sealing ring is provided to closely contact the surface, a contact sealing ring is provided adjacent to the upper end of the outer periphery of the inner sealing ring, the lower end of which is in close contact with the upper surface of the spout of the container, and At the upper end of the peripheral surface, an outer contact ring having a predetermined gap with the outer periphery of the upper end of the spout of the container is provided. This cap is made by injection molding using a thermoplastic resin having appropriate rigidity such as polypropylene.
[0011]
Next, an embodiment of a highly sealed cap with low opening / closing torque according to the present invention will be described in detail with reference to the drawings.
FIG. 1 is a cross-sectional view when a cap according to an embodiment of the present invention is screwed to a spout projecting from a pouring position of a liquid paper container. FIG. 2A is a cross-sectional view showing the shape of the contact portion of the inner sealing ring of the cap that is in close contact with the inner peripheral surface of the spout portion of the container, and FIG. FIG. FIG. 3 is an explanatory diagram showing a distance between an outer contact ring of a cap and an outer peripheral surface of an upper end portion of a spout of a container. FIG. 4 is an explanatory view showing a state in which when the cap is screwed into the spout portion of the container, the spout portion of the container falls outward due to a strong closing torque and contacts the outer contact ring of the cap. is there. FIG. 5 is a perspective view of an example of a liquid paper container with a plug.
[0012]
As shown in FIG. 1, a cap (100) according to an embodiment of the present invention includes a spout (spout port) (200) projecting from a pouring position of a top inclined plate (22) of a liquid paper container (20). A cap (100) screwed into the spout is formed by attaching an inner sealing ring (101) on the lower surface of the top plate (110) to closely contact the outer peripheral surface with the inner peripheral surface at the distal end portion of the spout discharging cylinder (220). A contact sealing ring (102) having a lower end in close contact with the upper surface of the spout dispensing cylinder adjacent to the upper end of the outer periphery of the inner sealing ring; and the inner peripheral surface of the peripheral wall (120) of the cap. An outer contact ring (103) having a predetermined gap with the outer periphery of the upper end portion of the spout discharging cylinder is provided at the upper end portion. Further, a female screw (121) to be screwed with the male screw (221) of the spout is provided on the inner peripheral surface of the peripheral wall of the cap below the outer contact ring.
[0013]
Then, as shown in FIG. 2A, the inner sealing ring (101) has an angle (α °) of 0 to a vertical line close to the inner peripheral surface of the upper end portion of the spout of the container on the outer peripheral surface. It has a slope that opens upward by 10 °. If the angle of the slope with respect to the vertical line is 10 ° or more, the degree of close contact with the inner peripheral surface of the upper end of the spout of the container becomes extremely large, and the closing torque becomes abnormally high.
[0014]
As shown in FIG. 2A, the height (H) of the outer peripheral surface of the inner sealing ring (101) in close contact with the inner peripheral surface of the upper end portion of the spout of the container is determined by setting the cap to the spout of the container. At a height corresponding to a screwing rotation angle of 20 ° to 60 ° when screwed into the device. At a screw rotation angle of 20 ° or less, the degree of close contact with the inner peripheral surface of the upper end portion of the container spout is insufficient, and at a screw rotation angle of 60 ° or more, the container spout is The degree of close contact with the inner peripheral surface of the upper end portion becomes more than necessary, and the closing torque increases.
[0015]
As shown in FIG. 2 (b), the contact sealing ring (101) has an inverted triangular cross section having a height (h) of 0.3 to 1.0 mm and a tip angle (β °) at a lower end. An acute angle of 30 to 90 ° is used. When the height is 0.3 mm or less, the sealing effect is deteriorated, and the height of 1.0 mm or more is unnecessary from the viewpoint of the sealing effect and the structure. When the tip angle is 30 ° or less, the tightness is reduced due to lack of rigidity, and when the tip angle is 90 ° or more, the change following the state of the closing torque becomes difficult, and the sealing property is impaired.
[0016]
The gap (D) between the outer contact ring (103) and the outer periphery of the upper end portion of the spout cylinder (220) of the spout (200) shown in FIG. 3 is the distance between the tip of the female screw (121) of the cap (100). It is provided at ± 0.3 mm of the interval (d) between the valley of the male screw (221) of the spout discharging cylinder and the spout. If the distance (d) between the tip of the female screw of the cap and the root of the male screw of the spout is -0.3 mm or less, the effect of providing a gap between the outer abutment ring and the outer periphery of the upper end of the spout pouring cylinder is not effective. When the upper end of the dispensing cylinder falls outward, the sealing effect of the inner sealing ring and the contact sealing ring is impaired, or the closeness between the male screw and the female screw is reduced. And the opening torque during use increases, and friction occurs on the contact surface of the screw thread, thereby causing tearing.
[0017]
As shown in FIG. 1, the cap according to the present embodiment has an inner sealing ring and a contact sealing ring adjacent to the inner sealing ring on the lower surface of the top plate. An outer abutment ring is provided to provide a gap with the outer periphery of the upper end of the spout cylinder. When the cap is screwed onto a spout made of a material with relatively low rigidity, the upper end of the spout spout cylinder is closed by a closing torque. Even if the portion falls outside, it stops by contacting the outer contact ring provided at the upper end portion of the inner peripheral surface of the peripheral wall of the cap and does not fall further. For this reason, the cap is not screwed more than necessary to the spout spout cylinder, and the opening torque during use is also appropriate. In addition, since at least the contact sealing ring maintains close contact with the top surface of the upper end of the spout pouring cylinder, the sealing effect of the cap on the spout is also improved. Also, excessive friction at the contact surface between the female screw of the cap and the male screw of the spout can be prevented.
[0018]
【The invention's effect】
The cap of the present invention is provided with an appropriately shaped inner sealing ring and a contact sealing ring that are in close contact with the spout of the container on the lower surface of the top plate, and the outer periphery of the upper end of the spout of the container. Outer abutment rings with appropriate intervals are provided, and due to the synergistic effects of these, the cap is a low opening / closing torque and a highly sealed cap. This cap can also be used when the material of the spout of the container is relatively low in rigidity.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view when a cap according to an embodiment of the present invention is screwed to a spout projecting from a liquid paper container at a pouring position.
2A is a cross-sectional view showing a shape of a contact portion of the inner sealing ring of the cap of the present invention shown in FIG. 1 which is in close contact with an inner peripheral surface of a spout portion of a container, and FIG. It is sectional drawing which shows the shape of a sealing ring.
FIG. 3 is an explanatory view showing an interval between an outer contact ring of the cap of the present invention shown in FIG. 1 and an outer peripheral surface of an upper end portion of a spout of a container.
FIG. 4 shows a case in which the cap of the present invention shown in FIG. 1 is screwed into the spout of the container, and the spout of the container falls down to contact the outer contact ring of the cap due to strong closing torque. It is explanatory drawing which shows the state.
FIG. 5 is a perspective view of an example of a liquid paper container with a stopper.
FIG. 6 is a cross-sectional view of a conventional example of a cap screwed to a spout protruding from a pouring position of a liquid paper container.
[Explanation of symbols]
10 Plug 20 Liquid paper container 21 Body 22 Top inclined plate 100 Cap 101 Inner seal ring 102 Contact seal ring 103 Outer contact ring 104 Outer sealing ring 110 Top plate 120 Peripheral wall 121 Female screw 200 Spout or spout 210 210 Base ring 220 Pour cylinder 221 Male screw 230 Closing plate 231 Annular cut 232 Annular thin brittle line 233 Support column 234 Pull ring 240 Sticking ring α °, β ° Angle H, h Height

Claims

A cap screwed onto a plastic spout of the container, provided on the lower surface of the top plate of the cap, an inner sealing ring for closely contacting the outer peripheral surface to the inner peripheral surface at the tip end of the spout of the container; A contact sealing ring is provided adjacent to the upper end of the outer periphery of the inner sealing ring, the lower end of which is in close contact with the upper surface of the spout of the container, and the cap of the container is provided at the upper end of the inner peripheral surface of the peripheral wall of the cap. A cap with a low opening / closing torque and high sealing, wherein an outer contact ring is provided with a gap provided with an outer periphery of an upper end portion of an outlet portion.

2. The inner sealing ring according to claim 1, wherein the outer peripheral surface has a slope that is upwardly opened at an angle of 0 to 10 ° with respect to a vertical line close to an inner peripheral surface of an upper end portion of the spout of the container. 3. Highly sealed cap with low opening and closing torque.

The height of the outer peripheral surface of the inner sealing ring in close contact with the inner peripheral surface of the upper end portion of the spout of the container is 20 ° to 60 ° in the screwing rotation angle when the cap is screwed to the spout of the container. The cap according to claim 1 or 2, wherein the cap has a low opening / closing torque and a high seal.

4. The low opening / closing torque according to claim 1, wherein the contact sealing ring has an inverted triangular cross section with a height of 0.3 to 1.0 mm and a tip angle of a lower end of 30 to 90 [deg.]. Highly sealed cap.

The gap between the outer contact ring and the outer periphery of the upper end of the spout of the container is ± 0.3 mm of the distance between the tip of the female screw of the cap and the valley of the external thread of the spout of the container. 5. The cap according to claim 1, wherein the cap has a low opening / closing torque and is highly sealed.