【０００１】
【発明の属する技術分野】
本発明は、清酒、果汁飲料、調味料、柔軟剤や液体洗剤などに使用される液体用紙容器の頂部に突設される開封刃内蔵口栓に関するものである。
【０００２】
【従来の技術】
従来、液体用紙容器（２０）には、例えば図４（ａ）に示すように、四角柱状の胴部（２１）をもち、その切妻屋根形の頂部傾斜板（２２）には、注出のし易さから開封刃内蔵口栓（１０）が突設されたものが広い商品分野において使用されてきた。この開封刃内蔵口栓（１０）には、例えば図４（ｂ）に示すように、下端に複数の三角状の開封刃（３１０）を欠刃部（３１１）を設けて垂設した開封用筒体（３００）をスパウト（１００）（注出口具）の注出筒（１１０）内側に下降可能に内蔵し、スパウトに螺着したキャップ（２００）を螺脱方向へ回転させたときに、キャップの天板の中央位置に垂設されたガイド用内筒の外周面に設けられたカム部の螺旋状の摺接案内傾斜面と、開封用筒体の内周面に設けられたカム部の螺旋状の摺接案内傾斜面との摺接によって、開封用筒体（３００）を降下させ、この開封用筒体の下端に欠刃部（３１１）を設けて並設された開封刃（３１０）で液体用紙容器を封止する封止フィルム（４００）を破断して開口するものが知られていた。なお、欠刃部を設けるのは、封止フィルムの破断片（４０１）が内容物（３０）中に落下しないようにするためである。そして、この開封刃内蔵口栓には、スパウトの下面に封止フィルムを熱融着して注出筒の下部開口部を封止した口栓を、液体用紙容器の口栓取付孔に注出筒を突出させて、フランジの上面を容器の内面に熱融着して取り付ける内付けのものと、図４（ａ）に示すように、液体用紙容器（２０）の封止フィルム（４００）で封止した注出孔（２３）の外周縁部上面に、スパウト（１００）のフランジ（１２０）の下面を熱融着して取り付ける外付けのものとがある。
【０００３】
【発明が解決しようとする課題】
しかしながら、上述の開封刃内蔵口栓においては、キャップを螺脱方向へ回転して、開封用筒体を降下させて、液体用紙容器を封止する封止フィルム（４００）を破断して開口し、キャップを取り外して容器を傾斜させて内容物をスパウトから注出したのち、再度、キャップでスパウトを再封止しようしたときに、キャップがスパウトに上手く螺着できないことがあった。これは、内容物をスパウトから勢いよく注出させると、封止フィルムの破断された開口孔の抑えだけで止まっている開封用筒体が、内容物の流出力によって、封止フィルムの開口孔の抑えから外れて、スパウトの注出口方向へ移動し、再封止するためにキャップをスパウトに螺着したときに、キャップのカム部の摺接案内傾斜面の下端部と開封用筒体のカム部の摺接案内傾斜面の上端部とが干渉し合ってしまうためである。
【０００４】
本発明は、上述の従来の開封刃内蔵口栓の問題を解決したものであり、内容物の流出力によって開封用筒体が注出口方向へ移動しても、再封止のために螺着されたキャップのカム部の下端部と開封用筒体のカム部の上端部とが干渉し合わない開封刃内蔵口栓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、液体用紙容器の注出位置に突設され、開封用筒体を内蔵するスパウトとこのスパウトに螺着するキャップとからなり、前記キャップを螺脱方向へ回転させたときに、前記スパウトの注出筒内側に内蔵され下端に開封刃をもつ開封用筒体が、前記キャップの回転にともなって降下して、下方に設けられている封止フィルムを破断して容器を開封する口栓において、キャップのガイド用内筒の外周面に設ける倒立直角三角形状のカム部の下端部の摺接案内傾斜面の対象側に、この摺接案内傾斜面と逆傾斜の干渉防止摺接傾斜面を設け、かつ、このキャップの干渉防止摺接傾斜面に対向させて、開封用筒体の内周面に設ける直角三角形状のカム部の上端部の摺接案内傾斜面の対象側に、この摺接案内傾斜面と逆傾斜の干渉防止摺接傾斜面を設けたことを特徴とする開封刃内蔵口栓である。
【０００６】
次に、第２の発明は、液体用紙容器の注出位置に突設され、開封用筒体を内蔵するスパウトとこのスパウトに螺着するキャップとからなり、前記キャップを螺脱方向へ回転させたときに、前記スパウトの注出筒内側に内蔵され下端に開封刃をもつ開封用筒体が、前記キャップの回転にともなって降下して、下方に設けられている封止フィルムを破断して容器を開封する口栓において、キャップのガイド用内筒の外周面に設ける倒立直角三角形状のカム部の下端部の摺接案内傾斜面の対象側に、この摺接案内傾斜面と逆傾斜の干渉防止摺接傾斜面を設けたことを特徴とする開封刃内蔵口栓である。
【０００７】
次に、第３の発明は、液体用紙容器の注出位置に突設され、開封用筒体を内蔵するスパウトとこのスパウトに螺着するキャップとからなり、前記キャップを螺脱方向へ回転させたときに、前記スパウトの注出筒内側に内蔵され下端に開封刃をもつ開封用筒体が、前記キャップの回転にともなって降下して、下方に設けられている封止フィルムを破断して容器を開封する口栓において、開封用筒体の内周面に設ける直角三角形状のカム部の上端部の摺接案内傾斜面の対象側に、この摺接案内傾斜面と逆傾斜の干渉防止摺接傾斜面を設けたことを特徴とする開封刃内蔵口栓である。
【０００８】
そして、本発明の第４の発明は、前記干渉防止摺接傾斜面の高さを、２ｍｍ以上にしたことを特徴とする第１乃至第３の発明に記載の開封刃内蔵口栓である。
【０００９】
【発明の実施の形態】
次に、本発明の開封刃内蔵口栓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開封刃内蔵口栓のキャップを螺脱方向へ回転したときのキャップのカム部の摺接案内傾斜面により開封用筒体のカム部の摺接案内傾斜面が受ける力の方向を示す展開説明図である。図２（ａ）は、キャップの一部を切欠いた平面図であり、図２（ｂ）は、底面図である。図３（ａ）は、開封用筒体の平面図であり、図３（ｂ）は、断面図である。
【００１０】
本発明の一実施形態の開封刃内蔵口栓は、下端に開封刃をもつ開封用筒体を移動可能に内蔵するスパウトとこのスパウトに螺着するキャップとからなり、キャップ（２００）は、図２（ａ）に示すように、天板（２１０）の下面中央部にガイド用内筒（２３０）を垂設し、このガイド用内筒（２３０）の外周面に、図２（ｂ）及び図１（ａ）に示すように、開封用筒体を降下させるための摺接案内傾斜面（２４１）と干渉防止摺接傾斜面（２４２）とをもつ倒立直角三角形状のカム部（２４０）を周方向へ等間隔に通常２個設け、また、図２（ａ）に示すように、天板（２１０）下面には必要に応じた、例えばコンタクト封止リングやインナー封止リングなどの封止リング（２１１）を設け、周壁（２２０）の内周面には、図２（ａ）及び（ｂ）に示すように、螺合部（２２１）を形成するものである。そして、開封用筒体（３００）は、下端に、図３（ｂ）に示すように、複数の三角状の開封刃（３１０）を欠刃部を設けて垂設し、外周面上端部に、図３（ａ）及び（ｂ）に示すように、通常４個の摺動突起（３２０）を周方向へ等間隔に設け、内周面に、図３（ａ）、図３（ｂ）及び図１（ａ）に示すように、摺接案内傾斜面（３３１）と干渉防止摺接傾斜面（３３２）とをもつ直角三角形状のカム部（３３０）を周方向へ等間隔にキャップのカム部と対応させて通常２個設けるものである。
【００１１】
なお、上述するキャップ（２００）のカム部（２４０）に設ける干渉防止摺接傾斜面（２４２）は、図１（ａ）に示すように、倒立直角三角形状のカム部（２４０）の下端部の摺接案内傾斜面（２４１）の対象側に、摺接案内傾斜面とは逆傾斜に設けるものであり、図１（ｂ）に示すその高さ（ｈ）は、２ｍｍ以上にするものである。２ｍｍ以下では、干渉防止効果が低下する。また、開封用筒体（３００）のカム部（３３０）に設ける干渉防止摺接傾斜面（３３２）は、図１（ａ）に示すように、直角三角形状のカム部（３３０）の上端部の摺接案内傾斜面（３３１）の対象側に、摺接案内傾斜面とは逆傾斜に設けるものであり、図１（ｂ）に示すその高さ（ｈ）は、２ｍｍ以上にするものである。２ｍｍ以下では、干渉防止効果が低下する。
【００１２】
容器に取り付けられた上述の本実施形態の開封刃内蔵口栓は、図１（ａ）に示すように、キャップ（２００）を螺脱方向（矢印）へ回転させたときに、キャップの摺接案内傾斜面（２４１）と開封用筒体の摺接案内傾斜面（３３１）との摺接により、開封用筒体（３００）が下方（矢印）へ移動して、下方の容器を封止している封止フィルムを開封用筒体の下端に設けられた開封刃で破断して、容器が開封するものである。そして、内容物を必要だけ使用したのちに、キャップをスパウトの注出筒に螺着して容器を再封止するものであるが、本実施形態の開封刃内蔵口栓は、開封用筒体が、内容物の流出力によって封止フィルムの開口孔の抑えから外れて上方へ移動していても、図１（ｂ）に示すように、螺着方向（矢印）へ回転して下降してくるキャップ（２００）のガイド用内筒の外周面の倒立直角三角形状のカム部（２４０）の下端部の干渉防止摺接傾斜面（２４２）が、開封用筒体（３００）の内周面の直角三角形状のカム部（３３０）の上端部の干渉防止摺接傾斜面（３３２）と摺接し、相互の傾斜面の作用によって、開封用筒体が下方（矢印）へ移動される。このため、キャップのカム部の摺接案内傾斜面の下端部と開封用筒体のカム部の摺接案内傾斜面の上端部とが干渉し合うことがなく、キャップがスパウトに螺着できなくなることがない。
【００１３】
なお、キャップのガイド用内筒の外周面の倒立直角三角形状のカム部の下端部と開封用筒体の内周面の直角三角形状のカム部の上端部との両方に干渉防止摺接傾斜面を設けたものは、干渉防止の効果がより完全であるが、どちらか一方だけに干渉防止摺接傾斜面を設けただけでも、干渉防止の効果がある。干渉防止摺接傾斜面を設けていない方のカム部の先端が、他方の干渉防止摺接傾斜面に摺接して、結果的には、キャップの螺着方向の回転により開封用筒体が下方へ移動されるからである。
【００１４】
【発明の効果】
本発明の開封刃内蔵口栓は、キャップのガイド用内筒のカム部の下端部と開封用筒体のカム部の上端部の両方又はいずれか一方に干渉防止摺接傾斜面が設けられており、この干渉防止摺接傾斜面の作用効果により、再封止のために螺着されたキャップのカム部の下端部と開封用筒体のカム部の上端部とが干渉し合って、スパウトにキャップが螺着することができなくなるようなことがない。
【図面の簡単な説明】
【図１】本発明の一実施形態の開封刃内蔵口栓のキャップを螺脱方向へ回転したときのキャップのカム部の摺接案内傾斜面により開封用筒体のカム部の摺接案内傾斜面が受ける力の方向を示す展開説明図である。
【図２】（ａ）は、本発明の開封刃内蔵口栓の一実施形態のキャップの一部を切欠いた平面図であり、（ｂ）は、その底面図である。
【図３】（ａ）は、本発明の開封刃内蔵口栓の一実施形態の開封用筒体の平面図であり、（ｂ）は、その断面図である。
【図４】（ａ）は、一例の開封刃内蔵口栓を取り付けた液体用紙容器の開封前の状態を示す説明図であり、（ｂ）は、開封したときの状態を示す説明図である。
【符号の説明】
１０……開封刃内蔵口栓
２０……液体用紙容器
２１……胴部
２２……頂部傾斜板
２３……注出孔
３０……内容物
１００……スパウト
１１０……注出筒
２２１……螺合部
１２０……フランジ
２００……キャップ
２１０……天板
２１１……封止リング
２２０……周壁
２３０……ガイド用内筒
２４０，３３０……カム部
２４１，３３１……摺接案内傾斜面
２４２，３３２……干渉防止摺接傾斜面
３００……開封用筒体
３１０……開封刃
３１１……欠刃部
３２０……摺動突起
４００……封止フィルム
４０１……破断片
ｈ……高さ[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a plug with a built-in opening blade protruding from the top of a liquid paper container used for sake, fruit juice drinks, seasonings, softeners, liquid detergents and the like.
[0002]
[Prior art]
Conventionally, a liquid paper container (20) has, for example, as shown in FIG. 4 (a), a quadrangular prism-shaped body (21), and a gable roof-shaped top inclined plate (22) has a spout. For ease of operation, the one provided with the opening plug (10) with a built-in opening blade has been used in a wide range of commercial fields. For example, as shown in FIG. 4 (b), a plurality of triangular opening blades (310) are provided at the lower end of the opening blade built-in opening plug (10) with a cut-off portion (311). When the cap (200) screwed into the spout is rotated in the unscrewing direction by incorporating the cylinder (300) inside the spout cylinder (110) of the spout (100) (spouting tool) so as to be lowered, A spiral sliding guide inclined surface of a cam portion provided on an outer peripheral surface of a guide inner cylinder vertically provided at a center position of a top plate of a cap, and a cam portion provided on an inner peripheral surface of an opening cylindrical body The sliding tubular body (300) is lowered by sliding contact with the spiral sliding guide inclined surface, and the opening blade (311) is provided at the lower end of the tubular tubular body and provided with the opening blade (311). It has been known that the sealing film (400) for sealing the liquid paper container is opened by breaking at 310). The reason why the notch portion is provided is to prevent broken pieces (401) of the sealing film from falling into the contents (30). Then, into the opening blade built-in plug, a sealing film is heat-sealed on the lower surface of the spout to seal the lower opening of the dispensing cylinder, and the stopper is poured into the stopper mounting hole of the liquid paper container. 4A, the cylinder is projected and the upper surface of the flange is heat-sealed to the inner surface of the container, and the sealing film (400) of the liquid paper container (20) as shown in FIG. On the upper surface of the outer peripheral edge portion of the sealed spout hole (23), there is an external one to which the lower surface of the flange (120) of the spout (100) is attached by heat fusion.
[0003]
[Problems to be solved by the invention]
However, in the above-described plug with a built-in opening blade, the cap is rotated in the unscrewing direction to lower the opening cylinder, and the sealing film (400) for sealing the liquid paper container is broken to open. After removing the cap and tilting the container to pour out the contents from the spout, when the spout is to be resealed again with the cap, the cap may not screw well onto the spout. This is because when the content is poured out of the spout vigorously, the opening cylinder, which stops only by suppressing the broken opening hole of the sealing film, causes the opening hole of the sealing film due to the flow output of the content. When the cap is screwed onto the spout to re-seal and move toward the spout outlet, the lower end of the sliding guide slope of the cam of the cap and the unsealing cylinder This is because the cam portion interferes with the upper end portion of the sliding guide inclined surface.
[0004]
The present invention solves the above-mentioned problem of the conventional opening blade built-in plug, and even if the opening cylinder moves in the spout direction due to the flow output of the contents, it is screwed in for resealing. It is an object of the present invention to provide a plug with a built-in opening blade in which the lower end of the cam portion of the cap and the upper end of the cam portion of the opening tubular body do not interfere with each other.
[0005]
[Means for Solving the Problems]
That is, the first invention of the present invention comprises a spout projecting from a liquid paper container at a pouring position and including an opening tubular body and a cap screwed to the spout. When rotated, the unsealing cylinder having an unsealing blade at the lower end, which is built in the inside of the spout ejection tube, descends with the rotation of the cap and breaks the sealing film provided below. In the spout for opening the container, the sliding contact guide inclined surface at the lower end of the inverted right triangular cam portion provided on the outer peripheral surface of the guide inner cylinder of the cap is opposite to the sliding contact inclined surface. A sliding contact guide for the upper end of a right-angled triangular cam portion provided on the inner peripheral surface of the opening tubular body provided with an inclined interference preventing sliding contact inclined surface and opposed to the interference preventing sliding contact inclined surface of the cap. On the target side of the inclined surface, the sliding contact guide inclined surface is reversely inclined. Is opened blade built spout, characterized in that a interference preventing sliding inclined surface.
[0006]
Next, a second invention comprises a spout protruding from the liquid paper container at a pouring position and having a built-in tubular body for opening and a cap screwed onto the spout, and rotating the cap in the unscrewing direction. When opened, the opening cylinder having an opening blade at the lower end built in the inside of the spout pouring cylinder descends with the rotation of the cap to break the sealing film provided below. In the stopper for opening the container, on the target side of the sliding contact guide inclined surface at the lower end of the inverted right triangular cam portion provided on the outer peripheral surface of the guide inner cylinder of the cap, the sliding contact guide inclined surface and the reverse inclined This is a plug with a built-in opening blade, which is provided with an inclined surface for preventing sliding interference.
[0007]
Next, a third invention comprises a spout protruding from a liquid paper container pouring position and having a built-in tubular body for opening and a cap screwed to the spout, and rotating the cap in the unscrewing direction. When opened, the opening cylinder having an opening blade at the lower end built in the inside of the spout pouring cylinder descends with the rotation of the cap to break the sealing film provided below. In the spout for opening the container, on the target side of the sliding contact guide inclined surface at the upper end of the right triangular cam portion provided on the inner peripheral surface of the opening tubular body, prevention of interference between the sliding contact guide inclined surface and the reverse inclination. A plug with a built-in opening blade, wherein a sliding inclined surface is provided.
[0008]
A fourth aspect of the present invention is the opening plug with a built-in opening blade according to the first to third aspects, wherein the height of the interference prevention sliding contact inclined surface is set to 2 mm or more.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of the plug with a built-in opening blade of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows a sliding guide inclination of a cam portion of an opening tubular body by a sliding guide inclination surface of a cam portion of a cap when the cap of the opening blade built-in plug of the embodiment of the present invention is rotated in a screwing direction. It is a development explanatory view showing the direction of the force which a surface receives. FIG. 2A is a plan view in which a part of the cap is cut away, and FIG. 2B is a bottom view. FIG. 3A is a plan view of the opening cylinder, and FIG. 3B is a cross-sectional view.
[0010]
A plug with a built-in opening blade according to an embodiment of the present invention includes a spout that movably incorporates an opening cylindrical body having an opening blade at a lower end, and a cap that is screwed to the spout. As shown in FIG. 2 (a), a guide inner cylinder (230) is suspended from the center of the lower surface of the top plate (210), and the outer peripheral surface of the guide inner cylinder (230) is provided on the outer peripheral surface of FIG. As shown in FIG. 1A, an inverted right-angled triangular cam portion (240) having a sliding guide inclined surface (241) for lowering the opening cylinder and an interference preventing sliding contact inclined surface (242). 2 are provided at regular intervals in the circumferential direction, and as shown in FIG. 2 (a), a sealing such as a contact sealing ring or an inner sealing ring is provided on the lower surface of the top plate (210) as necessary. A retaining ring (211) is provided, and the inner peripheral surface of the peripheral wall (220) is shown in FIGS. As shown in), and forms screwed part (221). Then, as shown in FIG. 3 (b), the opening tubular body (300) is provided with a plurality of triangular opening blades (310) at the lower end thereof, with a cut-off portion provided vertically, and at the upper end of the outer peripheral surface. As shown in FIGS. 3 (a) and 3 (b), usually four sliding projections (320) are provided at equal intervals in the circumferential direction, and the inner circumferential surface is provided with the four sliding protrusions (320). As shown in FIG. 1A, a right-angled triangular cam portion (330) having a sliding guide inclined surface (331) and an interference preventing sliding contact inclined surface (332) is provided at regular intervals in the circumferential direction of the cap. Usually, two are provided corresponding to the cam portions.
[0011]
In addition, as shown in FIG. 1A, the interference prevention sliding contact inclined surface (242) provided on the cam portion (240) of the cap (200) is a lower end portion of the inverted right triangular cam portion (240). The sliding contact guide inclined surface (241) is provided on the target side in a direction opposite to the sliding contact guide inclined surface, and its height (h) shown in FIG. 1 (b) is 2 mm or more. is there. If it is less than 2 mm, the effect of preventing interference decreases. Also, as shown in FIG. 1 (a), the anti-interference slidable inclined surface (332) provided on the cam portion (330) of the opening tubular body (300) is an upper end portion of the right triangular cam portion (330). The slope (331) is provided on the target side of the slide guide slope (331) in a direction opposite to the slide guide slope, and its height (h) shown in FIG. is there. If it is less than 2 mm, the effect of preventing interference decreases.
[0012]
As shown in FIG. 1A, when the cap (200) is rotated in the unscrewing direction (arrow), the cap with the built-in opening blade of the present embodiment attached to the container slides on the cap. Sliding contact between the guide inclined surface (241) and the guide inclined surface (331) causes the opening cylindrical member (300) to move downward (arrow) to seal the lower container. The sealing film is broken by an opening blade provided at the lower end of the opening cylinder to open the container. Then, after the contents are used as needed, the cap is screwed onto the spout pouring cylinder to reseal the container. However, as shown in FIG. 1 (b), even if the liquid is moved upward due to the flow output of the contents, the liquid is moved downward in the screwing direction (arrow) as shown in FIG. The inner peripheral surface of the opening tubular body (300) is formed by the interference prevention sliding contact slope (242) at the lower end of the inverted right triangular cam portion (240) on the outer peripheral surface of the guide inner cylinder of the coming cap (200). Of the right triangular cam portion (330) is in sliding contact with the interference prevention sliding contact slope (332) at the upper end, and the opening cylinder is moved downward (arrow) by the action of the mutual slope. For this reason, the lower end of the sliding guide inclined surface of the cam portion of the cap does not interfere with the upper end of the sliding contact inclined surface of the cam portion of the opening tubular body, and the cap cannot be screwed onto the spout. Nothing.
[0013]
In addition, both the lower end of the inverted right-angled triangular cam portion on the outer peripheral surface of the guide inner cylinder of the cap and the upper end of the right-angled triangular cam portion on the inner peripheral surface of the opening cylindrical body are slidably contacted to prevent interference. In the case where the surface is provided, the effect of preventing the interference is more complete, but the effect of preventing the interference can be obtained only by providing the anti-interference sliding contact inclined surface on only one of the surfaces. The tip of the cam portion not provided with the interference preventing sliding contact inclined surface comes into sliding contact with the other interference preventing sliding contact inclined surface, and as a result, the opening cylindrical body is lowered by the rotation of the cap in the screwing direction. Because it is moved to.
[0014]
【The invention's effect】
The plug with a built-in opening blade of the present invention is provided with an anti-interference sliding contact inclined surface on both or any one of the lower end of the cam portion of the inner cylinder for guiding the cap and the upper end of the cam portion of the opening cylindrical body. The lower end of the cam portion of the cap screwed for resealing and the upper end of the cam portion of the opening cylinder interfere with each other due to the action and effect of the interference prevention sliding contact inclined surface. There is no such thing that the cap cannot be screwed into the cap.
[Brief description of the drawings]
FIG. 1 shows a sliding guide inclination of a cam portion of an opening cylindrical body due to a sliding guide inclination surface of a cam portion of the cap when the cap of the opening blade built-in plug of the embodiment of the present invention is rotated in a screwing direction. It is a development explanatory view showing the direction of the force which a surface receives.
FIG. 2 (a) is a plan view of a cap of an embodiment of the plug with a built-in opening blade of the present invention, in which a part of a cap is cut away, and FIG. 2 (b) is a bottom view thereof.
FIG. 3 (a) is a plan view of an opening tubular body of an embodiment of a plug with a built-in opening blade of the present invention, and FIG. 3 (b) is a sectional view thereof.
FIG. 4A is an explanatory view showing a state before opening a liquid paper container to which an example of a plug with a built-in opening blade is attached, and FIG. 4B is an explanatory view showing a state when opened. .
[Explanation of symbols]
10 Opening blade built-in stopper 20 Liquid paper container 21 Body 22 Top inclined plate 23 Spout hole 30 Contents 100 Spout 110 Spout cylinder 221 Screw Joint 120 Flange 200 Cap 210 Top plate 211 Seal ring 220 Peripheral wall 230 Guide inner cylinders 240, 330 Cam parts 241, 331 Sliding guide slope 242 , 332: anti-interference slidable contact inclined surface 300: opening cylinder 310: opening blade 311: cutting edge portion 320: sliding protrusion 400: sealing film 401: broken piece h: height