JP2018002198A - Container lid and combination of container and container lid - Google Patents
Container lid and combination of container and container lid Download PDFInfo
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- JP2018002198A JP2018002198A JP2016129142A JP2016129142A JP2018002198A JP 2018002198 A JP2018002198 A JP 2018002198A JP 2016129142 A JP2016129142 A JP 2016129142A JP 2016129142 A JP2016129142 A JP 2016129142A JP 2018002198 A JP2018002198 A JP 2018002198A
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- 230000002093 peripheral effect Effects 0.000 claims abstract description 72
- 230000000903 blocking effect Effects 0.000 claims description 20
- 229920003002 synthetic resin Polymers 0.000 claims description 7
- 239000000057 synthetic resin Substances 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims 1
- 238000003475 lamination Methods 0.000 abstract 1
- 239000002699 waste material Substances 0.000 abstract 1
- 238000000465 moulding Methods 0.000 description 6
- 238000007789 sealing Methods 0.000 description 6
- -1 polyethylene Polymers 0.000 description 5
- 239000004698 Polyethylene Substances 0.000 description 3
- 238000004891 communication Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 235000013555 soy sauce Nutrition 0.000 description 2
- 239000004278 EU approved seasoning Substances 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 235000011194 food seasoning agent Nutrition 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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Abstract
Description
本発明は、圧搾自在な外側容器層と圧搾自在な内側容器層との積層構造である容器に適用される容器蓋に関すると共に、圧搾自在な外側容器層と圧搾自在な内側容器層との積層構造である容器と容器蓋との組み合わせに関する。 The present invention relates to a container lid applied to a container having a laminated structure of a squeezable outer container layer and a squeezable inner container layer, and a laminated structure of a squeezable outer container layer and a squeezable inner container layer. This relates to a combination of a container and a container lid.
下記特許文献１に開示されている如く、近時においては、調味料、特に醤油のための容器として、圧搾自在な外側容器層と圧搾自在な内側容器層との積層構造であり、外側容器層の口頸部には外側容器層と内側容器層との間に外気を導入するための導入孔が形成されている容器が広く実用に供されている。そして、かような容器のための容器蓋として、閉塞壁とこの閉塞壁の外周縁部から垂下する装着壁とを有する蓋本体を具備する容器蓋が利用されている。蓋本体の閉塞壁には排出開口が形成されていると共に、排出開口を閉じる逆止弁が配設されている。蓋本体の装着壁の内周面下部には、別個に成形したシール片が固着されており、このシール片の主部は装着壁の内周面下部から半径方向内方に延出する環状形態であり且つ可撓性を有する。 As disclosed in the following Patent Document 1, recently, as a container for seasonings, particularly soy sauce, it is a laminated structure of a squeezable outer container layer and a squeezable inner container layer, and the outer container layer. In general, containers having an introduction hole for introducing outside air between the outer container layer and the inner container layer are widely used in the mouth and neck. As a container lid for such a container, a container lid having a lid body having a closed wall and a mounting wall hanging from the outer peripheral edge of the closed wall is used. A discharge opening is formed in the closing wall of the lid body, and a check valve for closing the discharge opening is provided. A separately formed seal piece is fixed to the lower part of the inner peripheral surface of the mounting wall of the lid body, and the main part of the seal piece is an annular shape extending radially inward from the lower inner peripheral surface of the mounting wall. And has flexibility.
容器の口頸部に蓋本体の装着壁を被嵌することによって容器の口頸部に蓋本体が装着されると、蓋本体のシール片が容器の外側容器層の口頸部の外周面における導入孔よりも下方の部位に密接される。容器内の内容物を排出するために容器を圧搾して容器内の圧力を容器外の圧力よりも所定値以上大きくすると、逆止弁が開放されて排出開口を通して内容物が排出される。容器の圧搾を解除すると、容器が弾性的に復元されて外側容器層と内側容器層との間の圧力が漸次低減され、外側容器層と内側容器層との間の圧力が外気の圧力よりも所定値以上小さくなると、蓋本体のシール片が容器の外側容器層の口頸部の外周面から離隔し、外側容器層と内側容器層との間に外気が導入される。 When the lid body is attached to the mouth and neck portion of the container by fitting the mounting wall of the lid body to the mouth and neck portion of the container, the seal piece of the lid body is placed on the outer peripheral surface of the mouth and neck portion of the outer container layer of the container. It is in close contact with the part below the introduction hole. When the container is squeezed to discharge the contents in the container and the pressure in the container is made larger than the pressure outside the container by a predetermined value or more, the check valve is opened and the contents are discharged through the discharge opening. When the squeezing of the container is released, the container is elastically restored to gradually reduce the pressure between the outer container layer and the inner container layer, and the pressure between the outer container layer and the inner container layer is higher than the pressure of the outside air. When it becomes smaller than the predetermined value, the seal piece of the lid body is separated from the outer peripheral surface of the mouth / neck portion of the outer container layer of the container, and the outside air is introduced between the outer container layer and the inner container layer.
而して、上述したとおりの容器蓋及び容器と容器蓋との組み合わせには、蓋本体のシール片が蓋本体とは別個に成形され、蓋本体の装着壁の内周面の所要部位に固着されていることに起因して、容器蓋の製作が比較的煩雑であり、製作コストが比較的高価であるという問題が存在する。この点について更に付言すると、装着壁の内周面下部から半径方向に延出する環状可撓性シールを装着壁の内周面に一体に形成することは、成形後の型抜きの際の所謂無理抜きに起因してシール片が損傷される傾向があり、一般に不可能であると考えられていた。 Thus, in the container lid and the combination of the container and the container lid as described above, the seal piece of the lid body is formed separately from the lid body, and is fixed to a required portion on the inner peripheral surface of the mounting wall of the lid body. As a result, the production of the container lid is relatively complicated, and the production cost is relatively high. To further add to this point, the annular flexible seal that extends in the radial direction from the lower part of the inner peripheral surface of the mounting wall is integrally formed on the inner peripheral surface of the mounting wall. The seal piece has a tendency to be damaged due to excessive removal, and is generally considered impossible.
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、蓋本体の装着壁の内周面にシール片が一体に形成されているにも拘らずシール片を損傷せしめることなく成形することができる、新規且つ改良された容器蓋を提供すること、そしてまたかかる容器蓋と圧搾自在な外側容器層と圧搾自在な内側容器層との積層構造である容器との組み合わせを提供することである。 The present invention has been made in view of the above-mentioned facts, and its main technical problem is to damage the seal piece despite the fact that the seal piece is integrally formed on the inner peripheral surface of the mounting wall of the lid body. Providing a new and improved container lid that can be molded without loss, and also providing a combination of the container lid, a container that is a laminate structure of a squeezable outer container layer and a squeezable inner container layer It is to be.
本発明者は、鋭意検討の結果、蓋本体の装着壁の内周面に、半径方向内方に延出する環状可撓性シール片を一体に形成すると共に、シール片の上方に位置する捨てアンダーカットを形成することによって、上記主たる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 intensive studies, the present inventor integrally formed an annular flexible seal piece extending radially inward on the inner peripheral surface of the mounting wall of the lid body, and disposed above the seal piece. It has been found that the main technical problem can be achieved by forming an undercut.
本明細書において使用する語句「アンダーカット」は、突出部に起因して、成形型から容器蓋を取り出す際の成形型に対する容器蓋の相対的移動方向に見て、突出部の後方に存在する空間であって、成形型から容器蓋を取り出す際に所謂無理抜きを生成する空間、を意味する。また、語句「捨てアンダーカット」は、容器蓋自体の機能の点からは必ずしも必要でないものであるが、成形の際の望ましくない損傷を回避乃至抑制するために存在せしめられているアンダーカット、を意味する。 The phrase “undercut” used in the present specification exists behind the protrusion as viewed in the relative movement direction of the container lid with respect to the mold when the container lid is removed from the mold due to the protrusion. It means a space that creates a so-called forced removal when the container lid is taken out from the mold. In addition, the phrase “discarding undercut” is not necessarily required from the viewpoint of the function of the container lid itself, but an undercut that is present in order to avoid or suppress undesirable damage during molding. means.
本発明によれば、上記主たる技術的課題を解決する容器蓋として、閉塞壁と該閉塞壁の外周縁部から垂下する円筒形装着壁とを有し、該閉塞壁には排出開口が形成されていると共に、該排出開口を閉じる逆止弁が配設されており、該逆止弁は該閉塞壁の内側の圧力が外側の圧力より所定値以上大きくなると開状態になる合成樹脂製蓋本体を具備する容器蓋において、
該装着壁の内周面には、半径方向内方に延出する環状可撓性シール片が一体に形成されていると共に、該シール片の上方に位置する捨てアンダーカットが形成されている、ことを特徴とする容器蓋が提供される。
According to the present invention, the container lid for solving the main technical problem has a closed wall and a cylindrical mounting wall depending from the outer peripheral edge of the closed wall, and a discharge opening is formed in the closed wall. And a non-return valve for closing the discharge opening, and the non-return valve is opened when the pressure on the inner side of the blockage wall exceeds a predetermined value by a predetermined value or more. In a container lid comprising:
An annular flexible seal piece extending radially inward is integrally formed on the inner peripheral surface of the mounting wall, and a discarded undercut is formed above the seal piece. A container lid is provided.
好ましくは、該捨てアンダーカットは該シール片の上方において該装着壁の該内周面下部に一体に形成された環状突条又は周方向に間隔をおいて周方向に延びる複数個の弧状突条によって規定されている。該突条の半径方向突出寸法は該シール片の半径方向延出寸法と同一乃至それより大きい、のが好適である。該シール片の基端と該突条の基端との軸線方向離隔寸法は、該シール片の半径方向延出寸法よりも小さいのが望ましい。該シール片は半径方向内方に向かって下方に傾斜して延出するのが好都合である。また、天面壁と該天面壁の外周縁部から垂下するスカート壁とを有し、該スカート壁の下端が該蓋本体の該装着壁の上端にヒンジ手段を介して接続されていて、該蓋本体の該閉塞壁を覆う閉位置と該閉塞壁を露呈せしめる開位置との間の旋回自在である、該蓋本体と一体に形成された外蓋を具備するのが好都合である。 Preferably, the discard undercut is an annular ridge integrally formed on the lower portion of the inner peripheral surface of the mounting wall above the seal piece, or a plurality of arc-shaped ridges extending in the circumferential direction at intervals in the circumferential direction. It is prescribed by. It is preferable that a radial projecting dimension of the protrusion is equal to or larger than a radial extending dimension of the seal piece. It is desirable that the axial distance between the base end of the seal piece and the base end of the protrusion is smaller than the radial extension dimension of the seal piece. The seal piece advantageously extends in a downwardly inclined direction radially inward. A top wall and a skirt wall depending from the outer peripheral edge of the top wall, the lower end of the skirt wall being connected to the upper end of the mounting wall of the lid body via a hinge means, It is advantageous to have an outer lid that is integrally formed with the lid body that is pivotable between a closed position that covers the closure wall of the body and an open position that exposes the closure wall.
更に、本発明によれば、上記主たる技術的課題を達成する組み合わせとして、容器と上記のとおりの容器蓋との組み合わせにして、
該容器は圧搾自在な外側容器層と圧搾自在な内側容器層との積層構造であり、該容器の口頸部には該外側容器層と該内側容器層との間に外気を導入するための導入手段が形成されており、
該容器の該口頸部に該蓋本体の該装着壁を被嵌することによって該口頸部に容器蓋が装着されると、該蓋本体の該シール片が該容器の該外側容器層の該口頸部の外周面における該導入手段よりも下方の部位に密接され、
該内側容器層内の圧力が該容器外の圧力よりも所定値以上大きくなると該逆止弁が開放され、
該外側容器層と該内側容器層との間の圧力が外気の圧力よりも所定値以上小さくなった場合にのみ該蓋本体の該シール片が該外側容器層の該口頸部の外周面から離隔される、
ことを特徴とする組み合わせが提供される。
Furthermore, according to the present invention, as a combination for achieving the main technical problem, a combination of a container and a container lid as described above,
The container has a laminated structure of a squeezable outer container layer and a squeezable inner container layer, and is used to introduce outside air between the outer container layer and the inner container layer into the mouth and neck of the container. Introduction means are formed,
When the container lid is attached to the mouth / neck portion by fitting the mounting wall of the lid body onto the mouth / neck portion of the container, the seal piece of the lid body is attached to the outer container layer of the container. It is in close contact with the part below the introduction means on the outer peripheral surface of the mouth and neck,
When the pressure in the inner container layer becomes larger than the pressure outside the container by a predetermined value or more, the check valve is opened,
Only when the pressure between the outer container layer and the inner container layer is smaller than the pressure of the outside air by a predetermined value or more, the seal piece of the lid body is removed from the outer peripheral surface of the mouth / neck portion of the outer container layer. Separated,
A combination characterized by this is provided.
該容器の該外側容器層の該口頸部の該外周面には該導入手段よりも下方に位置する環状突出部が形成されており、該蓋本体の該シール片はその先端部が該環状突出部の上面に密接されるのが好都合である。 An annular protrusion located below the introduction means is formed on the outer peripheral surface of the mouth-neck portion of the outer container layer of the container, and the tip of the seal piece of the lid body is annular. Conveniently it is in close contact with the upper surface of the protrusion.
本発明に従って構成された容器蓋及び容器と容器蓋においては、成形型から容器蓋を取り出す際に、捨てアンダーカットの存在に起因して蓋本体の装着壁におけるシール片が存在する部位が半径方向外方に強制され、これによってシール片の所謂無理抜きが軽減され、シール片が損傷されることが可及的に回避される。 In the container lid and the container and the container lid configured according to the present invention, when the container lid is taken out from the mold, the portion where the seal piece is present on the mounting wall of the lid main body due to the presence of the undercut is disposed in the radial direction. Forced outwardly, this reduces the so-called unreasonable removal of the sealing piece and prevents the sealing piece from being damaged as much as possible.
以下、添付図面を参照して、本発明に従って構成された容器蓋及び容器と容器蓋との組み合わせの好適実施形態について、更に詳述する。 Hereinafter, a preferred embodiment of a container lid and a combination of a container and a container lid configured according to the present invention will be described in detail with reference to the accompanying drawings.
先ず、容器について図１を参照して説明すると、全体を番号２で示す容器は圧搾自在な外側容器層４と圧搾自在な内側容器層６との積層構造である。容器２は、外側容器層４を形成するための基材（外側プリフォーム）の内側に内側容器層６を形成するための基材（内側プリフォーム）を予め積層させた状態で、外側プリフォームと内側プリフォームとを一体にブローして共押し出しすることで形成される。かような容器２の成形方法は周知であり、詳細については例えば特許第２５８６２９４号公報を参照されたい。外側容器層４の原料は高密度ポリエチレンの如き適宜の合成樹脂であると共に内側容器層６の原料はナイロンの如き適宜の合成樹脂であり、外側容器層４と内側容器層６との間では静電気等による相互吸着力が生じにくく、外側容器層４と内側容器層６とは剥離容易であるのが好都合である。 First, the container will be described with reference to FIG. 1. The container denoted by reference numeral 2 as a whole has a laminated structure of a squeezable outer container layer 4 and a squeezable inner container layer 6. The container 2 is an outer preform in a state in which a base material (inner preform) for forming the inner container layer 6 is laminated in advance inside a base material (outer preform) for forming the outer container layer 4. And the inner preform are blown together and coextruded. Such a method for forming the container 2 is well known, and for example, refer to Japanese Patent No. 2586294 for details. The raw material of the outer container layer 4 is an appropriate synthetic resin such as high-density polyethylene, and the raw material of the inner container layer 6 is an appropriate synthetic resin such as nylon. Static electricity is generated between the outer container layer 4 and the inner container layer 6. It is advantageous that mutual adsorbing force due to, for example, is not easily generated, and the outer container layer 4 and the inner container layer 6 are easily peeled off.
容器２の円筒形口頸部８には外側容器層４と内側容器層６との間に外気を導入するための導入手段１０が形成されている。図示の実施形態においては、口頸部８は有底筒壁形状である外側容器層４の上端部に設けられ、導入手段１０は口頸部８において周方向に間隔を置いて複数個設けられた小孔から構成されている。導入手段１０は、後述するとおりにして容器蓋を容器２に装着した際に、閉塞壁に形成されたシールリング３４の下端よりも下方に位置する。口頸部８の外周面には上端部に位置する環状係止突条１２と、導入手段１０よりも下方に位置する環状突出部１４とが形成されている。環状突出部１４の更に下方には容器を運搬する際に使用される公知のサポートリング１６も形成されている。内側容器層６は上端が開放された袋状であり、その外周面上端部は外側容器層４の内周面上端部と密着している。所望ならば、内側容器層６の上端部に半径方向外方に突出する環状突出部を設け、この環状突出部が外側容器層４の上端よりも上方に位置すると共にこれに係合されるようにし、容器２の口頸部が外側容器層４の上端部と共に内側容器層６の環状突出部から構成されると共に導入手段１０が内側容器層６に形成されるようにしてもよい。 An introduction means 10 for introducing outside air is formed between the outer container layer 4 and the inner container layer 6 in the cylindrical mouth-neck portion 8 of the container 2. In the illustrated embodiment, the mouth and neck portion 8 is provided at the upper end portion of the outer container layer 4 having a bottomed cylindrical wall shape, and a plurality of introduction means 10 are provided at intervals in the circumferential direction in the mouth and neck portion 8. It consists of small holes. The introduction means 10 is positioned below the lower end of the seal ring 34 formed on the closing wall when the container lid is attached to the container 2 as described later. On the outer peripheral surface of the mouth-and-neck portion 8, an annular locking ridge 12 positioned at the upper end portion and an annular protrusion 14 positioned below the introduction means 10 are formed. A known support ring 16 used for transporting the container is also formed below the annular protrusion 14. The inner container layer 6 has a bag shape with an open upper end, and the upper end portion of the outer peripheral surface is in close contact with the upper end portion of the inner peripheral surface of the outer container layer 4. If desired, an annular protrusion projecting radially outward is provided at the upper end of the inner container layer 6 so that the annular protrusion is positioned above and engaged with the upper end of the outer container layer 4. In addition, the mouth / neck portion of the container 2 may be formed of the annular protrusion of the inner container layer 6 together with the upper end of the outer container layer 4, and the introduction means 10 may be formed in the inner container layer 6.
次いで、容器蓋について図１を参照して説明を続けると、全体を番号１８で示す容器蓋は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蓋本体２０を具備する。蓋本体２０は、閉塞壁２２とこの閉塞壁２２の外周縁部から垂下する円筒形装着壁２４とを有する。閉塞壁２２は、円形中央領域２２ａと、この中央領域２２ａよりも下方に位置する円環状外周領域２２ｂと、中央領域２２ａと外周領域２２ｂとを接続し上面が半径方向外方に向かって下方に傾斜している円環状接続領域２２ｃとを有する。中央領域２２ａの中央には円形排出開口２６が形成されており、中央領域２２ａの上面には排出開口２６の外周縁を囲繞して上方に延びる案内壁２８が形成されている。案内壁２８の主部は略円筒形状であり、案内壁２８の上端部には断面が略半円形状であるリップが設けられている。中央領域２２ａの下方には後述する逆止弁７０が配設され、これにより排出開口２６が閉じられる。外周領域２２ｂの上面には略円筒形状の係止壁３０が形成されている。係止壁３０は外周領域２２ｂの半径方向略中間位置において上方に延出せしめられており、その外周面上端には、半径方向外方に突出した環状係止突条３２が形成されている。外周領域２２ｂの下面には略円筒形状のシールリング３４が形成されている。シールリング３４は外周領域２２ｂの半径方向略中間位置において下方に垂下している。接続領域２２ｃの下面には略円筒形状の環状保持壁３６が形成されている。保持壁３６の内周面下端には、半径方向内方に突出した環状保持突条３８が形成されている。 Next, the description of the container lid will be continued with reference to FIG. 1. The container lid, generally designated by numeral 18, comprises a lid body 20 that can be injection-molded or compression-molded from a suitable synthetic resin such as polyethylene or polypropylene. . The lid body 20 includes a blocking wall 22 and a cylindrical mounting wall 24 depending from the outer peripheral edge of the blocking wall 22. The blocking wall 22 connects the circular central region 22a, the annular outer peripheral region 22b positioned below the central region 22a, the central region 22a and the outer peripheral region 22b, and the upper surface is directed downward radially outward. And an annular connection region 22c that is inclined. A circular discharge opening 26 is formed at the center of the central region 22a, and a guide wall 28 is formed on the upper surface of the central region 22a so as to surround the outer peripheral edge of the discharge opening 26 and extend upward. The main portion of the guide wall 28 has a substantially cylindrical shape, and a lip having a substantially semicircular cross section is provided at the upper end portion of the guide wall 28. A check valve 70, which will be described later, is disposed below the central region 22a, whereby the discharge opening 26 is closed. A substantially cylindrical locking wall 30 is formed on the upper surface of the outer peripheral region 22b. The locking wall 30 extends upward at a substantially intermediate position in the radial direction of the outer peripheral region 22b, and an annular locking ridge 32 protruding outward in the radial direction is formed at the upper end of the outer peripheral surface. A substantially cylindrical seal ring 34 is formed on the lower surface of the outer peripheral region 22b. The seal ring 34 hangs downward at a substantially intermediate position in the radial direction of the outer peripheral region 22b. A substantially cylindrical annular holding wall 36 is formed on the lower surface of the connection region 22c. At the lower end of the inner peripheral surface of the holding wall 36, an annular holding ridge 38 protruding inward in the radial direction is formed.
図１と共に図２を参照して説明を続けると、装着壁２４の内周面における軸線方向略中間位置には、周方向に間隔を置いて周方向に延びる複数個（図示の場合は６個）の弧状被係止突条４０が形成されている。そして、装着壁２４の内周面には、半径方向内方に延出する環状可撓性シール片４２が一体に形成されていると共に、このシール片４２の上方に位置する捨てアンダーカット４４が形成されていることが重要である。図示の実施例においては、シール片４２は装着壁２４の内周面下部に形成されており、捨てアンダーカット４４は、シール片４２の上方において装着壁２４の内周面下部に一体に形成された環状突条４６によって規定されている。また、シール片４２自体によってアンダーカット４８が規定されている。突条４６の断面は半径方向内方に突出する略円弧形状である。図１と共に図７（ｃ）を参照して説明すると、突条４６の半径方向突出寸法Ｌ１はシール片４２の半径方向延出寸法Ｌ２と実質上同一乃至それより幾分大きいのが好ましい。シール片４２の基端と突条４６の基端との軸線方向離隔寸法Ｄは、シール片４２の半径方向突出寸法Ｌ２よりも小さい。シール片４２は半径方向内方に向かって下方に傾斜して延出しており、横断面図において弧状である。所望ならば、捨てアンダーカット４４は周方向に間隔を置いて周方向に延びる複数個の弧状突条によって規定することもできる。 The description will be continued with reference to FIG. 2 together with FIG. 1. At the substantially intermediate position in the axial direction on the inner peripheral surface of the mounting wall 24, a plurality of pieces (six in the illustrated case) extend in the circumferential direction at intervals in the circumferential direction. ) Of the arc-shaped locked protrusion 40 is formed. An annular flexible seal piece 42 extending inward in the radial direction is integrally formed on the inner peripheral surface of the mounting wall 24, and a discard undercut 44 positioned above the seal piece 42 is formed. It is important that it is formed. In the illustrated embodiment, the seal piece 42 is formed at the lower portion of the inner peripheral surface of the mounting wall 24, and the discard undercut 44 is formed integrally with the lower portion of the inner peripheral surface of the mounting wall 24 above the seal piece 42. It is defined by the annular ridge 46. The undercut 48 is defined by the seal piece 42 itself. The cross section of the protrusion 46 has a substantially arc shape protruding inward in the radial direction. Referring to FIG. 7 together with FIG. 7, the radial protrusion dimension L1 of the protrusion 46 is preferably substantially the same as or somewhat larger than the radial extension dimension L2 of the seal piece 42. The axial distance D between the base end of the seal piece 42 and the base end of the protrusion 46 is smaller than the radial protrusion dimension L2 of the seal piece 42. The seal piece 42 extends downward inward in the radial direction, and has an arc shape in the cross-sectional view. If desired, the discard undercut 44 may be defined by a plurality of arcuate ridges extending circumferentially at intervals in the circumferential direction.
蓋本体２０の装着壁２４の上端にはヒンジ手段５０を介して外蓋５２が接続されている。外蓋５２は蓋本体２０と一体に形成され（従って外蓋５２も合成樹脂製である）、蓋本体２０の閉塞壁２２を覆う閉位置（図１において実線で示す状態）と閉塞壁２２を露呈せしめる開位置（図１において二点鎖線で示す状態）との間で旋回自在である。外蓋５２は天面壁５４とこの天面壁５４の外周縁部から垂下するスカート壁５６とを有する。天面壁５４の内面には、その中央において下方に延出する閉塞栓５８と、この閉塞栓５８の外側において下方に垂下する外側シール片６０及び内側シール片６２とが形成されている。閉塞栓５８は中実棒状である。外側シール片６０及び内側シール片６２は共に略円筒形状である。内側シール片６２は外側シール片６０に比べて天面壁５４からの垂下長さが長く、閉塞栓５８は内側シール片６２に比べて天面壁５４からの垂下長さが長い。所望ならば、閉塞栓５８と内側シール片６２とは一体であってもよい。天面壁５４の内面における内側シール片６２と外側シール片６０との間には、外蓋５２を閉位置から開位置に旋回せしめる際に天面壁５４の内面に付着した内容液の飛散を防止するための二重円環溝６４が形成されている。スカート壁５６の内周面の下端部には、環状被係止突条６６が形成されている。ヒンジ手段５０と直径方向反対側において、スカート壁５６の外周面下端部には、外蓋５２を旋回動せしめる際に指を掛けることができる鍔部６８が形成されている。 An outer lid 52 is connected to the upper end of the mounting wall 24 of the lid body 20 via a hinge means 50. The outer lid 52 is formed integrally with the lid body 20 (therefore, the outer lid 52 is also made of synthetic resin), and the closed position (the state indicated by the solid line in FIG. 1) covering the closure wall 22 of the lid body 20 and the closure wall 22 It can be swung between an open position where it is exposed (a state indicated by a two-dot chain line in FIG. 1). The outer lid 52 includes a top wall 54 and a skirt wall 56 depending from the outer peripheral edge of the top wall 54. On the inner surface of the top wall 54, a closing plug 58 that extends downward at the center thereof, and an outer seal piece 60 and an inner seal piece 62 that hang downward on the outside of the closing plug 58 are formed. The obturator plug 58 has a solid bar shape. Both the outer seal piece 60 and the inner seal piece 62 have a substantially cylindrical shape. The inner seal piece 62 has a longer hanging length from the top wall 54 than the outer seal piece 60, and the closing plug 58 has a longer hanging length from the top wall 54 than the inner seal piece 62. If desired, the closure plug 58 and the inner seal piece 62 may be integrated. Between the inner seal piece 62 and the outer seal piece 60 on the inner surface of the top wall 54, the content liquid adhering to the inner surface of the top wall 54 is prevented from scattering when the outer lid 52 is swung from the closed position to the open position. A double annular groove 64 is formed. An annular locked protrusion 66 is formed at the lower end portion of the inner peripheral surface of the skirt wall 56. On the opposite side of the hinge means 50 in the diametrical direction, a lower end portion of the outer peripheral surface of the skirt wall 56 is formed with a collar portion 68 that can be hooked with a finger when the outer lid 52 is swung.
本発明に従って構成された容器蓋１８には、全体を番号７０で示す逆止弁も配設されている。この逆止弁７０は弁部材７２と保持部材７４とから構成される。図１と共に図３乃至図５を参照して説明すると、ポリエチレン、ゴム、エラストマー、シリコン等の如き比較的軟質である合成樹脂から形成される弁部材７２は、略円板形状であって下方に位置する弁部７６と、円環形状であって上方に位置する基部７８と、弁部７６と基部７８とを接続する接続部８０とを有する。弁部７６の上面は全体として半径方向外方に向かって下方に傾斜する弧状面であり、その上面中央には上方に膨出する膨出部８２が形成されている。弁部７６の外周面下端部には半径方向内方に向かって下方に傾斜する逆円錐台形状のシール部８４が形成されている。図１を参照することによって理解されるとおり、弁部７６の下面には空間部８５が形成されている。空間部８５は断面略半楕円形状の主部８５ａと、この主部８５ａの長径方向中央にて上方に突出する凸部８５ｂとから構成されている。接続部８０は周方向に等角度間隔を置いて３個配設されている。夫々の接続部８０は接続基部８０ａと接続片８０ｂを有する。図３乃至図５を参照することによって理解されるとおり、接続基部８０ａは基部７８から下方に垂下する円弧状部材である。接続片８０ｂは、接続基部８０ａの内周面下端部の周方向中央位置から半径方向内方に延出した後に、下方から見て（即ち図５において）時計方向に所定程度円弧状に延出し、次いで再び半径方向内方に延出して弁部７６におけるシール部８４よりも上方の外周面に接続される帯状部材である。更に、図４を参照することによって明確に理解されるとおり、接続片８０ｂは全体的に半径方向内方に向かって下方に傾斜している。このことから、弁部７６は基部７８に対して上下方向に移動可能であり、弁部７６が接続基部８０ａに対して上方に移動した際には、弁部７６には接続片８０ｂの弾性力による下向きの復元力が常時作用せしめられる。 The container lid 18 constructed in accordance with the present invention is also provided with a check valve, generally designated 70. The check valve 70 includes a valve member 72 and a holding member 74. Referring to FIG. 3 to FIG. 5 together with FIG. 1, the valve member 72 formed from a relatively soft synthetic resin such as polyethylene, rubber, elastomer, silicon, etc. It has a valve portion 76 that is positioned, a base portion 78 that is annular and positioned above, and a connection portion 80 that connects the valve portion 76 and the base portion 78. The upper surface of the valve portion 76 is an arcuate surface inclined downward in the radial direction as a whole, and a bulging portion 82 bulging upward is formed at the center of the upper surface. At the lower end portion of the outer peripheral surface of the valve portion 76, an inverted frustoconical seal portion 84 that is inclined downward inward in the radial direction is formed. As can be understood by referring to FIG. 1, a space portion 85 is formed on the lower surface of the valve portion 76. The space portion 85 includes a main portion 85a having a substantially semi-elliptical cross section and a convex portion 85b that protrudes upward at the center in the major axis direction of the main portion 85a. Three connection portions 80 are arranged at equal angular intervals in the circumferential direction. Each connection portion 80 has a connection base portion 80a and a connection piece 80b. As can be understood by referring to FIGS. 3 to 5, the connection base 80 a is an arcuate member that hangs downward from the base 78. The connection piece 80b extends radially inward from the center position in the circumferential direction of the lower end portion of the inner peripheral surface of the connection base 80a, and then extends in a circular arc shape to a predetermined degree in the clockwise direction when viewed from below (that is, in FIG. 5). Then, it is a belt-like member that extends inward in the radial direction again and is connected to the outer peripheral surface above the seal portion 84 in the valve portion 76. Furthermore, as clearly understood by referring to FIG. 4, the connecting piece 80 b is inclined downward in the radial direction as a whole. Therefore, the valve portion 76 can move in the vertical direction with respect to the base portion 78, and when the valve portion 76 moves upward with respect to the connection base portion 80a, the valve portion 76 has an elastic force of the connection piece 80b. The downward restoring force by is always applied.
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より形成される保持部材７４は円筒形側壁８６と側壁８６の下端に接続された略円形底壁８８とを有する。側壁８６の外周面上端部には半径方向外方に突出する環状被保持突条９０が形成されている。底壁８８は半径方向内方に向かって幾分下方に傾斜せしめられており、底壁８８の中央領域には円形連通開口９２が規定されている。更に、底壁８８には、連通開口９２の外周縁においてこれを囲繞して下方に向かって半径方向内方に幾分傾斜して延びる円筒形導入壁９４が形成されている。 Referring to FIG. 1, the holding member 74 formed of a suitable synthetic resin such as polyethylene or polypropylene has a cylindrical side wall 86 and a substantially circular bottom wall 88 connected to the lower end of the side wall 86. At the upper end of the outer peripheral surface of the side wall 86, an annular supported ridge 90 is formed that protrudes radially outward. The bottom wall 88 is inclined somewhat downward inward in the radial direction, and a circular communication opening 92 is defined in the central region of the bottom wall 88. Further, the bottom wall 88 is formed with a cylindrical introduction wall 94 that surrounds the outer peripheral edge of the communication opening 92 and extends downwardly and inclines slightly inward in the radial direction.
上述した逆止弁７０は、外蓋５２が蓋本体２０に対して開位置にある状態で閉塞壁２２に装着される。その際には、逆止弁７０は、保持部材７４の内側に弁部材７２を配置して弁部材７２が保持部材７４によって保持された状態で、閉塞壁２２の中央領域２２ａの下方に位置せしめられ、閉塞壁２２に対して上方に強制される。閉塞壁２２に対して逆止弁７０が上方に強制されると、被保持突条９０は保持突条３８を弾性的に乗り越えてこれに係止される。閉塞壁２２に逆止弁７０が装着された状態にあっては、弁部材７２は、基部７８の上面が閉塞壁２２の下面と密着すると共に接続基部８０ａの下面が保持部材７４の底壁８８の上面と密着して上下方向の移動が規制されると共に、基部７８の外周面及び接続基部８０ａの外周面が側壁８６の内周面と対向して径方向の移動が規制される。このとき更に、シール部８４が底壁８８の内周縁部上面乃至導入壁９４の基端部内周面と当接して、弁部７６は接続基部８０ａに対して幾分上方へ移動させられる。すると、接続部８０は上述したとおりの弾性力を有する故に弁部７６には下方への復元力が作用し、シール部８４は底壁８８の内周縁部上面乃至導入壁９４の基端部内周面と密着し、これにより逆止弁７０が閉塞される。逆止弁７０が閉塞壁２２に装着された後に、外蓋５２が蓋本体２０に対して閉位置にせしめられる。 The check valve 70 described above is attached to the blocking wall 22 in a state where the outer lid 52 is in the open position with respect to the lid body 20. At that time, the check valve 70 is positioned below the central region 22 a of the blocking wall 22 in a state where the valve member 72 is disposed inside the holding member 74 and the valve member 72 is held by the holding member 74. And forced upward with respect to the blocking wall 22. When the check valve 70 is forced upward with respect to the blocking wall 22, the held protrusion 90 is elastically moved over the holding protrusion 38 and is locked thereto. In the state where the check valve 70 is mounted on the blocking wall 22, the valve member 72 has the upper surface of the base portion 78 in close contact with the lower surface of the blocking wall 22 and the lower surface of the connection base portion 80 a is the bottom wall 88 of the holding member 74. The upper and lower surfaces of the base portion 78 and the outer peripheral surface of the connection base portion 80a are opposed to the inner peripheral surface of the side wall 86 and the movement in the radial direction is restricted. At this time, the seal portion 84 further contacts the upper surface of the inner peripheral edge of the bottom wall 88 or the inner peripheral surface of the proximal end portion of the introduction wall 94, and the valve portion 76 is moved somewhat upward with respect to the connection base portion 80a. Then, since the connecting portion 80 has the elastic force as described above, a downward restoring force acts on the valve portion 76, and the seal portion 84 is the upper surface of the inner peripheral edge portion of the bottom wall 88 or the inner periphery of the proximal end portion of the introduction wall 94. In close contact with the surface, the check valve 70 is closed. After the check valve 70 is mounted on the blocking wall 22, the outer lid 52 is brought into the closed position with respect to the lid body 20.
醤油の如き液体内容物が内側容器層６内に充填された容器２に容器蓋１８を装着する際には、容器２の口頸部８に容器蓋１８の装着壁２４を被嵌し（このとき、シールリング３４の先端部外周面は内側容器層６の内周面上端部よりも半径方向内側に位置している）、容器蓋１８を容器２に対して下方に強制せしめる。容器蓋１８が容器２に対して下方に強制されると、装着壁２４に形成されたシール片４２、突条４６、及び被係止突条４０が順次口頸部８に形成された係止突条１２を弾性的に乗り越え、シール片４２の先端部の下面が環状突出部１４の上面に密接されると共に、被係止突条４０が係止突条１２に係止される。シール片４２が突条１２を弾性的に乗り越える際には、シール片４２の基端と突条４６の基端との軸線方向離隔寸法Ｄがシール片４２の半径方向突出寸法Ｌ２よりも小さいことに起因して、シール片４２の上面が突条４６の下面と当接しこれによってシール片４２が過剰に撓むことが回避され、シール片４２が反転することが防止される。このとき更に、閉塞壁２２に形成されたシールリング３４は容器２の内部、更に詳しくは内側容器層６の内部、に進入すると共にこれを半径方向外方に弾性的に押圧する。これにより、シールリング３４の外周面が内側容器層６の上端部内周面と密着し、内容物がシールリング３４の外側を通過して内側容器層６（即ち容器２）の外部に流出することが阻止される。かくして、容器蓋１８は容器２の口頸部８に装着される。 When the container lid 18 is attached to the container 2 filled with the liquid content such as soy sauce in the inner container layer 6, the attachment wall 24 of the container lid 18 is fitted on the mouth neck portion 8 of the container 2 (this (The outer peripheral surface of the tip of the seal ring 34 is located radially inward from the upper end of the inner peripheral surface of the inner container layer 6), and the container lid 18 is forced downward with respect to the container 2. When the container lid 18 is forced downward with respect to the container 2, the sealing piece 42 formed on the mounting wall 24, the protrusion 46, and the locked protrusion 40 are sequentially formed on the neck 8. The protrusion 12 is elastically moved over, the lower surface of the tip of the seal piece 42 is brought into close contact with the upper surface of the annular protrusion 14, and the locked protrusion 40 is locked to the locking protrusion 12. When the seal piece 42 elastically climbs over the protrusion 12, the axial distance D between the base end of the seal piece 42 and the base end of the protrusion 46 should be smaller than the radial protrusion dimension L 2 of the seal piece 42. Due to the above, it is avoided that the upper surface of the seal piece 42 comes into contact with the lower surface of the protrusion 46 and thereby the seal piece 42 is bent excessively, and the seal piece 42 is prevented from being inverted. At this time, the seal ring 34 formed on the blocking wall 22 enters the inside of the container 2, more specifically, the inside of the inner container layer 6 and elastically presses it radially outward. As a result, the outer peripheral surface of the seal ring 34 comes into close contact with the inner peripheral surface of the upper end portion of the inner container layer 6, and the contents pass outside the seal ring 34 and flow out of the inner container layer 6 (that is, the container 2). Is blocked. Thus, the container lid 18 is attached to the mouth / neck portion 8 of the container 2.
容器の内容物を消費する際には、先ず、外蓋５２の鍔部６８に指を掛けて外蓋５２を上方に強制せしめ、外蓋５２の被係止突条６６を、蓋本体２０の係止突条３２から弾性的に離脱させて、外蓋５２を図１に二点鎖線で示す開位置に向けて旋回動せしめ、かくして閉塞壁２２を露呈せしめる。そして、容器２の側面を把持して適宜に傾斜せしめ、容器２を圧搾する。容器２が圧搾されることで、外側容器層４と共に内側容器層６も圧搾され、内側容器層６内の圧力が容器２外の圧力よりも大きくなる。そして、内側容器層６内の圧力が容器２外の圧力（即ち、閉塞壁２２の内側の圧力が外側の圧力）よりも所定値以上大きくなると、逆止弁７０の弁部７６が上述した接続部８０の弾性力に抗して上方に移動せしめられ、シール部８４が底壁８８の内周縁部上面乃至導入壁９４の基端部内周面から離隔し、逆止弁７０が開放される。この際には、弁部７６の下面に主部８５ａと凸部８５ｂとから構成される空間部８５が形成されていることに起因して、内側容器層６内の圧力によって弁部７６を上方へ移動させようとする応力が弁部７６の下面に効率的に作用し、弁部７６は円滑に上方へ移動せしめられる。逆止弁７０が開放されると、内側容器層６内に充填された内容物が連通開口９２、逆止弁７０（更に詳しくは弁部材７２と保持部材７４との間）、そして排出開口２６を順次通過した後に案内壁２８から排出される。 When consuming the contents of the container, first, the outer lid 52 is forced upward by placing a finger on the collar portion 68 of the outer lid 52, and the locked protrusion 66 of the outer lid 52 is placed on the lid main body 20. The outer cover 52 is pivotally moved toward the open position shown by a two-dot chain line in FIG. 1 by elastically disengaging from the locking protrusion 32, thus exposing the blocking wall 22. Then, the side surface of the container 2 is gripped and appropriately tilted, and the container 2 is squeezed. By squeezing the container 2, the inner container layer 6 is also squeezed together with the outer container layer 4, and the pressure inside the inner container layer 6 becomes larger than the pressure outside the container 2. When the pressure in the inner container layer 6 becomes larger than the pressure outside the container 2 (that is, the pressure inside the blocking wall 22 is the pressure outside), the valve portion 76 of the check valve 70 is connected as described above. The seal portion 84 is moved away from the upper surface of the inner peripheral edge of the bottom wall 88 or the inner peripheral surface of the base end of the introduction wall 94, and the check valve 70 is opened. At this time, the valve portion 76 is moved upward by the pressure in the inner container layer 6 due to the formation of the space portion 85 composed of the main portion 85a and the convex portion 85b on the lower surface of the valve portion 76. Thus, the stress to be moved to efficiently acts on the lower surface of the valve portion 76, and the valve portion 76 is smoothly moved upward. When the check valve 70 is opened, the contents filled in the inner container layer 6 are communicated with the communication opening 92, the check valve 70 (more specifically, between the valve member 72 and the holding member 74), and the discharge opening 26. Are sequentially discharged from the guide wall 28.
内容物の排出を停止する際には、容器２の側面の圧搾を解除する。容器２の側面の圧搾が解除されると、内側容器層６内の圧力は容器２外の圧力と等しくなるため、逆止弁７０の弁部７６が接続部８０の上述した復元力によって下方に移動せしめられ、シール部８４が底壁８８の内周縁部上面乃至導入壁９４の基端部内周面と密着し、逆止弁７０が封止される。これにより内容物の排出が停止すると共に内側容器層６は密閉される。この際には、弁部７６の上面が全体として半径方向外方に向かって下方に傾斜する弧状面であることに起因して、弁部７６の上面に残留した内容物は半径方向外方に向かって案内される。内容物の排出が停止すると共に内側容器層６が密閉された際には更に、外側容器層４は自身の有する弾性力により復元、即ち圧搾された状態から元の有底筒壁形状に膨張し、これによって外側容器層４と内側容器層６との間が負圧となる。そして、外側容器層４と内側容器層６との間の圧力が外気の圧力よりも所定値以上小さくなると、図６に二点鎖線で示すように、負圧によって蓋本体２０のシール片４２の先端部が外側容器層４の口頸部８の外周面に形成された環状突出部１４の上面から離隔されて隙間ができ、この隙間を通って外気が導入手段１０から外側容器層４と内側容器層６との間に導入される。外側容器層４と内側容器層６との間の圧力が外気の圧力と等しくなると、図６に実線で示すように、シール片４２は元の状態に復元し、シール片４２の先端部の下面は環状突出部１４の上面に再度密接される。しかる後に、外蓋５２を図１に二点鎖線で示す開位置から閉位置に向かって旋回動せしめて、外蓋５２の被係止突条６６を蓋本体２０の係止突条３２に弾性的に係止する。かくして外蓋５２が閉位置にせしめられる。外蓋５２が閉位置に位置せしめられると、外蓋５２の閉塞栓５８の先端は閉塞壁２２の排出開口２６を通って逆止弁７０の膨出部８２と当接しこれを下方に押圧せしめる。これにより、弁部材７２のシール部８４と保持部材７４における底壁８８の内周縁部上面乃至導入壁９４の基端部内周面との密着がより強固になり、逆止弁７０（更に詳しくは弁部材７２と保持部材７４との間）から内容物が漏れ出てくることがより一層確実に防止される。また、外蓋５２の内側シール片６２が蓋本体２０の案内壁２８内に進入して内側シール片６２の外周面下端部が案内壁２８の基端部内周面に密着されると共に、外側シール片６０の内周面下端部が案内壁２８のリップ部の先端部外周面と密着し、逆止弁７０と排出開口２６との間に残留した内容物が排出開口２６を通過して蓋本体２０の外部に漏れ出ることも防止される。 When stopping the discharge of the contents, the squeezing of the side surface of the container 2 is released. When the squeezing of the side surface of the container 2 is released, the pressure in the inner container layer 6 becomes equal to the pressure outside the container 2, so that the valve portion 76 of the check valve 70 is moved downward by the restoring force of the connection portion 80 described above. The seal portion 84 comes into close contact with the upper surface of the inner peripheral edge of the bottom wall 88 or the inner peripheral surface of the proximal end portion of the introduction wall 94, and the check valve 70 is sealed. Thereby, the discharge of the contents stops and the inner container layer 6 is sealed. At this time, the content remaining on the upper surface of the valve portion 76 is radially outward due to the fact that the upper surface of the valve portion 76 is an arcuate surface inclined downward in the radial direction as a whole. You will be guided towards. When the discharge of the contents is stopped and the inner container layer 6 is sealed, the outer container layer 4 is restored by its own elastic force, that is, expanded from the squeezed state to the original bottomed cylindrical wall shape. This creates a negative pressure between the outer container layer 4 and the inner container layer 6. Then, when the pressure between the outer container layer 4 and the inner container layer 6 becomes smaller than the pressure of the outside air by a predetermined value or more, as shown by a two-dot chain line in FIG. A tip portion is separated from the upper surface of the annular projecting portion 14 formed on the outer peripheral surface of the mouth-and-neck portion 8 of the outer container layer 4 to form a gap, and outside air passes from the introduction means 10 to the inner side of the outer container layer 4 through the gap. It is introduced between the container layer 6. When the pressure between the outer container layer 4 and the inner container layer 6 becomes equal to the pressure of the outside air, the seal piece 42 is restored to the original state as shown by the solid line in FIG. Is again brought into close contact with the upper surface of the annular protrusion 14. Thereafter, the outer lid 52 is pivoted from the open position indicated by the two-dot chain line in FIG. 1 toward the closed position, and the latched ridge 66 of the outer lid 52 is elastically engaged with the latch ridge 32 of the lid body 20. To lock. Thus, the outer lid 52 is brought to the closed position. When the outer lid 52 is positioned at the closed position, the tip of the closing plug 58 of the outer lid 52 abuts against the bulging portion 82 of the check valve 70 through the discharge opening 26 of the blocking wall 22 and presses it downward. . As a result, the close contact between the seal portion 84 of the valve member 72 and the upper surface of the inner peripheral edge of the bottom wall 88 or the inner peripheral surface of the proximal end of the introduction wall 94 in the holding member 74 becomes stronger. It is more reliably prevented that the contents leak out from between the valve member 72 and the holding member 74). Further, the inner seal piece 62 of the outer lid 52 enters the guide wall 28 of the lid body 20 so that the lower end portion of the outer peripheral surface of the inner seal piece 62 is brought into close contact with the inner peripheral surface of the base end portion of the guide wall 28 and the outer seal. The lower end portion of the inner peripheral surface of the piece 60 is in close contact with the outer peripheral surface of the tip end portion of the lip portion of the guide wall 28, and the contents remaining between the check valve 70 and the discharge opening 26 pass through the discharge opening 26 and the lid body. Leakage outside 20 is also prevented.
次に、上述したように構成された容器蓋を射出成形によって形成した際に、蓋本体を形成するための成形型の一部から容器蓋を取り出す工程について図７を参照して説明する。全体を番号９６で示す略円筒形状の成形型部材の外周面は、容器蓋１８の蓋本体２０における、被係止突条４０、シール片４２、及び突条４６を含む装着壁２４の内周面を規定しており、捨てアンダーカット４４に対応する環状凸部９８と、アンダーカット４８に対応する環状凸部１００とを有する。 Next, a process of taking out the container lid from a part of the molding die for forming the lid body when the container lid configured as described above is formed by injection molding will be described with reference to FIG. The outer peripheral surface of the substantially cylindrical mold member indicated generally by numeral 96 is the inner periphery of the mounting wall 24 including the locked protrusion 40, the seal piece 42, and the protrusion 46 in the lid body 20 of the container lid 18. A surface is defined, and an annular convex portion 98 corresponding to the discarded undercut 44 and an annular convex portion 100 corresponding to the undercut 48 are provided.
容器蓋１８を射出成形によって形成した後であって、成形型９６から蓋本体２０を取り出す前の状態が図７（ａ）に示されている。図７（ａ）に示す状態において、成形型９６から蓋本体２０を取り出すには、蓋本体２０に対して成形型９６を降下せしめる。蓋本体２０に対して成形型９６を降下せしめる際には、凸部１００がシール片４２を乗り越えると共に、凸部９８が突条４６を乗り越える。この際には、図７（ｂ）に示すとおり、凸部９８により突条４６が半径方向外方に強制せしめられ、装着壁２４の下部が一時的に拡径される。これにより、凸部１００がシール片４２を乗り越える際には、凸部１００はその先端部がシール片４２の延出端部と接触して幾分撓ませた後にこれを容易に通過することが可能となる。つまり、成形型９６から容器蓋１８（蓋本体２０）を取り出す際に、捨てアンダーカット４４の存在に起因して蓋本体２０の装着壁２４におけるシール片４２が存在する部位が半径方向外方に強制され、これによってシール片４２の所謂無理抜きが軽減され、シール片４２が損傷されることが可及的に回避される。図示の実施形態においては、突条４６の半径方向突出寸法Ｌ１はシール片４２の半径方向延出寸法Ｌ２と同一乃至それより幾分大きい故に、凸部１００がシール片４２を通過する際には、シール片４２が形成された部位における装着壁２４は突条４６の半径方向突出寸法Ｌ１、即ちシール片４２の半径方向延出寸法Ｌ２と略同等分だけ半径方向外方に拡径されており、シール片４２の無理抜きが確実に緩和され、シール片４２が損傷されることが可及的に回避される。凸部９８がシール片４２を乗り越えた後は、図７（ｃ）に示すとおり、成形型９６を下方に降下せしめることで容器蓋２が成形型９６から取り出される。 FIG. 7A shows a state after the container lid 18 is formed by injection molding and before the lid body 20 is taken out from the molding die 96. In the state shown in FIG. 7A, in order to take out the lid main body 20 from the molding die 96, the molding die 96 is lowered with respect to the lid main body 20. When the mold 96 is lowered with respect to the lid body 20, the convex portion 100 gets over the seal piece 42 and the convex portion 98 gets over the protrusion 46. At this time, as shown in FIG. 7B, the protrusions 46 are forced radially outward by the convex portions 98, and the lower portion of the mounting wall 24 is temporarily expanded in diameter. Thereby, when the convex part 100 gets over the seal piece 42, the convex part 100 can easily pass after the tip part of the convex part 100 comes into contact with the extended end part of the seal piece 42 and is bent somewhat. It becomes possible. That is, when the container lid 18 (lid body 20) is taken out from the mold 96, the portion where the seal piece 42 is present on the mounting wall 24 of the lid body 20 is radially outward due to the presence of the discard undercut 44. This forces the so-called unreasonable removal of the sealing piece 42 and prevents the sealing piece 42 from being damaged as much as possible. In the illustrated embodiment, since the radial protrusion dimension L1 of the protrusion 46 is the same as or slightly larger than the radial extension dimension L2 of the seal piece 42, when the convex portion 100 passes through the seal piece 42, The mounting wall 24 at the portion where the seal piece 42 is formed is expanded radially outwardly by an amount substantially equal to the radial protrusion dimension L1 of the protrusion 46, that is, the radial extension dimension L2 of the seal piece 42. The unreasonable removal of the seal piece 42 is reliably mitigated, and damage to the seal piece 42 is avoided as much as possible. After the convex part 98 gets over the seal piece 42, the container lid 2 is taken out of the mold 96 by lowering the mold 96 downward as shown in FIG.
２：容器
４：外側容器層
６：内側容器層
８：口頸部
１０：孔（導入手段）
１８：容器蓋
２０：蓋本体
２２：閉塞壁
２４：装着壁
２６：排出開口
４２：シール片
４４：捨てアンダーカット
５２：外蓋
７０：逆止弁
９６：成形型
９８：凸部
１００：凸部
2: Container 4: Outer container layer 6: Inner container layer 8: Mouth and neck 10: Hole (introduction means)
18: Container lid 20: Lid main body 22: Closure wall 24: Mounting wall 26: Discharge opening 42: Seal piece 44: Discarded undercut 52: Outer lid 70: Check valve 96: Mold 98: Convex part 100: Convex part
Claims (8)
該装着壁の内周面には、半径方向内方に延出する環状可撓性シール片が一体に形成されていると共に、該シール片の上方に位置する捨てアンダーカットが形成されている、ことを特徴とする容器蓋。 A blocking wall and a cylindrical mounting wall depending from the outer peripheral edge of the blocking wall, the discharge wall being formed in the blocking wall, and a check valve for closing the discharge opening being disposed The check valve is a container lid having a synthetic resin lid body that is opened when the pressure on the inner side of the blocking wall becomes larger than the outer pressure by a predetermined value,
An annular flexible seal piece extending radially inward is integrally formed on the inner peripheral surface of the mounting wall, and a discarded undercut is formed above the seal piece. A container lid characterized by that.
該容器は圧搾自在な外側容器層と圧搾自在な内側容器層との積層構造であり、該容器の口頸部には該外側容器層と該内側容器層との間に外気を導入するための導入手段が形成されており、
該容器の該口頸部に該蓋本体の該装着壁を被嵌することによって該口頸部に該容器蓋が装着されると、該蓋本体の該シール片が該容器の該外側容器層の該口頸部の外周面における該導入手段よりも下方の部位に密接され、
該内側容器層内の圧力が該容器外の圧力よりも所定値以上大きくなると該逆止弁が開放され、
該外側容器層と該内側容器層との間の圧力が外気の圧力よりも所定値以上小さくなった場合にのみ該蓋本体の該シール片が該外側容器層の該口頸部の外周面から離隔される、
ことを特徴とする組み合わせ。 In combination with the container and the container lid according to any one of claims 1 to 6,
The container has a laminated structure of a squeezable outer container layer and a squeezable inner container layer, and is used to introduce outside air between the outer container layer and the inner container layer into the mouth and neck of the container. Introduction means are formed,
When the container lid is attached to the mouth / neck portion by fitting the mounting wall of the lid body onto the mouth / neck portion of the container, the seal piece of the lid body is attached to the outer container layer of the container. In the outer peripheral surface of the mouth and neck portion of the mouth and neck is in close contact with the site below the introduction means,
When the pressure in the inner container layer becomes larger than the pressure outside the container by a predetermined value or more, the check valve is opened,
Only when the pressure between the outer container layer and the inner container layer is smaller than the pressure of the outside air by a predetermined value or more, the seal piece of the lid body is removed from the outer peripheral surface of the mouth / neck portion of the outer container layer. Separated,
A combination characterized by that.
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| WO2021091075A1 (en) * | 2019-11-07 | 2021-05-14 | 정병찬 | Vacuum container cover and vacuum container including same |
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