JP6300644B2

JP6300644B2 - Double container

Info

Publication number: JP6300644B2
Application number: JP2014112554A
Authority: JP
Inventors: 桑原　和仁; 和仁桑原; 智坂本
Original assignee: Yoshino Kogyosho Co Ltd
Current assignee: Yoshino Kogyosho Co Ltd
Priority date: 2014-05-30
Filing date: 2014-05-30
Publication date: 2018-03-28
Anticipated expiration: 2034-05-30
Also published as: JP2015227169A

Description

本発明は、二重容器に関し、特に、内容液の充填空間を有する減容変形可能な内層体と、内層体をその内側に収める外層体とを備え、内容液の注出に伴って内層体のみが減容する二重容器に関するものである。 The present invention relates to a double container, and in particular, includes a volume-deformable inner layer body having a filling space for the content liquid, and an outer layer body for accommodating the inner layer body inside thereof, and the inner layer body as the content liquid is poured out. It is only related to double containers that reduce volume.

化粧水などの化粧料や、シャンプーやリンス或いは液体石鹸、また食品調味料や薬品などを収用する容器としては、このような液体を収容するとともに減容変形可能に設けられる内層体と、この内層体を内側に収める外層体とを備える二重容器（デラミ容器、積層剥離容器とも言う）が知られている。このような二重容器として、例えば特許文献１には、外層体の胴部を押圧することで、外層体と内層体との間の空気を介して内層体を押圧して内容液を注出させる、スクイズタイプの容器が示されている。 As a container for receiving cosmetics such as lotion, shampoo, rinse, liquid soap, food seasoning or chemicals, an inner layer body that accommodates such liquids and can be reduced in volume and deformed, and this inner layer A double container (also referred to as a delamination container or a delamination container) including an outer layer body that contains the body inside is known. As such a double container, for example, in Patent Document 1, by pressing the body portion of the outer layer body, the inner layer body is pressed through the air between the outer layer body and the inner layer body, and the content liquid is poured out. A squeeze-type container is shown.

特開２０１１−３１９２１号公報JP 2011-31921 A

ところで、このような二重容器では、容器の成型のばらつきにより容器の口部周壁の上端面の位置が上下方向で多少異なる場合がある。通常、充填ラインで容器にキャップを装着するキャッピング工程では、順次流れてくる容器に対して、口部周壁の上端面とキャップとが接触するように一定トルクでキャッピングしていくが、口部周壁の上端面位置にばらつきがあると、口部周壁の上端面とキャップとの接触位置についても個々の容器によって上下方向にばらつきが発生するという問題がある。 By the way, in such a double container, the position of the upper end surface of the peripheral wall of the mouth of the container may be slightly different in the vertical direction due to variations in container molding. Normally, in the capping process of attaching a cap to a container in a filling line, capping is performed with a constant torque so that the upper end surface of the mouth peripheral wall and the cap come into contact with the sequentially flowing containers. If there is a variation in the position of the upper end surface, there is a problem that the contact position between the upper end surface of the peripheral wall of the mouth and the cap also varies in the vertical direction depending on the individual containers.

キャッピング工程において一定トルクで締め付けを行う場合に、口部周壁の上端面とキャップとの接触位置がばらつくと、容器の口部におけるキャップの締め位置（締め角度）もまた個々の容器によってばらついてしまい、同一製品間であっても完成度にばらつきが生じてしまう。 When tightening at a constant torque in the capping process, if the contact position of the upper end surface of the peripheral wall of the mouth and the cap varies, the tightening position (tightening angle) of the cap at the mouth of the container also varies depending on the individual container. Even in the same product, the degree of completion will vary.

本発明の目的は、上記問題に鑑み、キャップを一定トルクで締める際にキャップ締め位置がばらつくことを抑制可能な二重容器を提供することである。 In view of the above problems, an object of the present invention is to provide a double container capable of suppressing variations in cap tightening position when a cap is tightened with a constant torque.

本発明の第１の態様としての二重容器は、内容液の充填空間を有する減容変形可能な内層体と、前記内層体をその内側に収めると共に口部周壁に設けた貫通開口から前記内層体との相互間に空気を導入する外層体と、前記口部周壁の上部開口を覆う天壁を有し、前記天壁に前記充填空間に通じる注出開口を備える中栓と、前記注出開口を通じて内容液を注出する注出筒、外界に通じる外気導入孔、及び前記口部周壁に装着される外周壁を有し、前記中栓を内側で保持する注出キャップと、を備える二重容器であって、前記口部周壁の外周面と前記外周壁の内周面とは、前記貫通開口よりも下側の位置で当接してシール部を形成しており、前記外層体に対して前記注出キャップを装着する際、前記中栓の、前記口部周壁の上端面に対向する下端部が、前記口部周壁と当接する前に、前記外周壁の下端が前記シール部よりも下側で前記外層体の肩部の上面に当接することを特徴とする二重容器。 The double container according to the first aspect of the present invention comprises a volume-deformable inner layer body having a filling space for the content liquid, and the inner layer from the through-opening provided in the peripheral wall of the mouth while accommodating the inner layer body inside thereof. An outer layer body that introduces air between the body, a top wall that covers an upper opening of the peripheral wall of the mouth, and an inner plug that includes a pouring opening that leads to the filling space in the top wall, and the pouring A dispensing cylinder that pours the content liquid through the opening, an outside air introduction hole that communicates with the outside, and a dispensing cap that has an outer peripheral wall attached to the peripheral wall of the mouth and holds the inner plug inside. a heavy container, the outer peripheral surface of the opening portion peripheral wall and the the inner circumferential surface of the outer peripheral wall forms a seal portion in contact with the lower position than the through-opening, the outer layer body to When installing the pouring cap, the lower end of the inner plug facing the upper end surface of the peripheral wall of the mouth But before abuts with the opening wall, double container, characterized in that the lower end of the outer peripheral wall abuts the upper surface of the shoulder portion of the outer member on the lower side than the sealing portion.

本発明の１つの実施形態として、前記肩部の前記上面は、前記口部周壁の中心軸線方向と直交する方向に延在する環状の平面であることが好ましい。 As one embodiment of the present invention, it is preferable that the upper surface of the shoulder portion is an annular plane extending in a direction orthogonal to the central axis direction of the mouth peripheral wall.

本発明の１つの実施形態として、前記シール部を形成する前記口部周壁の前記外周面と、前記肩部の前記上面とは連続していることが好ましい。 As one embodiment of the present invention, it is preferable that the outer peripheral surface of the peripheral wall of the mouth forming the seal portion and the upper surface of the shoulder portion are continuous.

本発明によれば、キャップを一定トルクで締める際にキャップ締め位置がばらつくことを抑制可能な二重容器を提供することができる。 ADVANTAGE OF THE INVENTION According to this invention, when tightening a cap by fixed torque, the double container which can suppress that a cap tightening position varies can be provided.

本発明の一実施形態である二重容器を示す断面図である。It is sectional drawing which shows the double container which is one Embodiment of this invention. 図１の一部を拡大した拡大断面図である。It is the expanded sectional view which expanded a part of FIG.

以下、図面を参照して、本発明をより具体的に説明する。なお、本明細書、特許請求の範囲、要約書において、「上」とは、二重容器を水平面上に載置した際に外層体に対して注出キャップが位置する側であり、「下」とは、その反対側である。 Hereinafter, the present invention will be described more specifically with reference to the drawings. In this specification, claims and abstract, “upper” means the side where the pouring cap is located with respect to the outer layer body when the double container is placed on a horizontal plane, "Is the opposite side.

図１は、本発明に係る二重容器の一実施形態としての二重容器１を示す図である。二重容器１は、内容液を収容する内層体１０、内層体１０を内側に収める外層体２０、中栓３０、逆止弁４０、移動弁５０、注出キャップ６０、及び蓋体７０を備える。 FIG. 1 is a view showing a double container 1 as an embodiment of the double container according to the present invention. The double container 1 includes an inner layer body 10 that contains the content liquid, an outer layer body 20 that houses the inner layer body 10 inside, an inner plug 30, a check valve 40, a moving valve 50, a dispensing cap 60, and a lid body 70. .

内層体１０は、その内側に内容液を収容する充填空間Ｓを備えている。内層体１０は薄肉の合成樹脂製であって、減容変形自在となっている。 The inner layer body 10 includes a filling space S for containing the content liquid therein. The inner layer body 10 is made of a thin synthetic resin and can be deformed by volume reduction.

外層体２０は、図示を省略する底部につながる胴部２１と、下部が上部よりも大径となる段付き円筒状の口部周壁２２と、胴部２１と口部周壁２２との間に位置し、胴部２１及び口部周壁２２を連結する肩部２５と、を有する。口部周壁２２は、上部に位置する小径部２６と、下部に位置する大径部２７とを有し、口部周壁２２の小径部２６には上方へ向けて開口する上部開口２２ａが設けられている。口部周壁２２の小径部２６の外周面には、雄ねじ部２２ｂが設けられている。また口部周壁２２には、内層体１０と外層体２０との相互間に空気を導入させるための貫通開口２３が設けられていて、更に、貫通開口２３が位置する口部周壁２２の小径部２６の外周面には、雄ねじ部２２ｂを上下方向に切り欠く溝部２４が設けられている。なお、内層体１０は、口部周壁２２の上端面２８の位置まで延びており、内層体１０の上端部１１は上端面２８上に積層されている。 The outer layer body 20 is positioned between a trunk portion 21 connected to a bottom portion (not shown), a stepped cylindrical mouth peripheral wall 22 having a lower diameter larger than the upper portion, and the trunk portion 21 and the mouth peripheral wall 22. And a shoulder portion 25 connecting the trunk portion 21 and the mouth peripheral wall 22. The mouth peripheral wall 22 has a small-diameter portion 26 located at the upper portion and a large-diameter portion 27 located at the lower portion. The small-diameter portion 26 of the mouth peripheral wall 22 is provided with an upper opening 22a that opens upward. ing. A male screw portion 22 b is provided on the outer peripheral surface of the small diameter portion 26 of the mouth portion peripheral wall 22. The mouth peripheral wall 22 is provided with a through-opening 23 for introducing air between the inner layer body 10 and the outer layer body 20, and a small diameter portion of the mouth peripheral wall 22 where the through-opening 23 is located. On the outer peripheral surface of 26, a groove portion 24 is provided to cut out the male screw portion 22b in the vertical direction. The inner layer body 10 extends to the position of the upper end surface 28 of the mouth peripheral wall 22, and the upper end portion 11 of the inner layer body 10 is laminated on the upper end surface 28.

本実施形態において内層体１０と外層体２０は、相互に相溶性が低い合成樹脂を剥離可能に積層させたものであり、これらの合成樹脂素材を積層して形成したパリソンを、ブロー成形することによって得られたものである。ブロー成形の他にも、試験管状に形成したプリフォームを２軸延伸ブロー成形することや、外層体及び内層体を個別に形成し、その後、内層体を外層体内に装着するようにしたものを用いてもよい。また、図示は省略するが、内層体１０と外層体２０との間に、縦方向に延在して内層体１０と外層体２０とを部分的に接合する、１本或いは複数本の接着帯を設けてもよい。 In this embodiment, the inner layer body 10 and the outer layer body 20 are obtained by laminating synthetic resins having low compatibility with each other so as to be peelable, and blow molding a parison formed by laminating these synthetic resin materials. It was obtained by. In addition to blow molding, a preform formed into a test tube is biaxially stretch blow molded, or an outer layer body and an inner layer body are individually formed, and then the inner layer body is mounted in the outer layer body. It may be used. Although not shown, one or a plurality of adhesive bands that extend in the vertical direction between the inner layer body 10 and the outer layer body 20 and partially join the inner layer body 10 and the outer layer body 20 to each other. May be provided.

中栓３０は、外層体２０の上部開口２２ａを覆う天壁３１を有している。本実施形態では天壁３１に、上下を貫通させるとともに充填空間Ｓに向けて延在する筒状壁３２が設けられている。本実施形態の筒状壁３２は、その内周面の横断面形状が円になる円筒状であるが、内周面の横断面形状が四角形や六角形等の多角形になる角筒状のものであってもよい。また筒状壁３２には、下方に向かうにつれて内径を狭める縮径部３２ａが設けられている。天壁３１には、筒状壁３２に隣接して上向き凸状となる段部３３を設けていて、この段部３３に、表裏を貫通する注出開口３４を設けている。また天壁３１の上面には、筒状壁３２及び段部３３を取り囲むとともに、これらとの相互間に逆止弁４０を嵌合保持する環状の嵌合壁３５を設けている。更に、嵌合壁３５の径方向外側には、天壁３１の縁部から起立する円筒状の内周壁３６を設けている。そして、天壁３１の下面には、内層体１０を挟み込んで外層体２０の口部周壁２２の内周面と当接する環状のシール壁３７を設けている。また、図１に示すように、内周壁３６の下部には開口３８が設けられている。 The inner plug 30 has a top wall 31 that covers the upper opening 22 a of the outer layer body 20. In the present embodiment, the top wall 31 is provided with a cylindrical wall 32 that penetrates the top and bottom and extends toward the filling space S. The cylindrical wall 32 of the present embodiment is a cylindrical shape in which the cross-sectional shape of the inner peripheral surface is a circle, but is a rectangular tube shape in which the cross-sectional shape of the inner peripheral surface is a polygon such as a quadrangle or a hexagon. It may be a thing. The cylindrical wall 32 is provided with a reduced diameter portion 32a that narrows the inner diameter as it goes downward. The top wall 31 is provided with a stepped portion 33 that protrudes upward adjacent to the cylindrical wall 32, and the stepped portion 33 is provided with a pouring opening 34 that penetrates the front and back. In addition, an annular fitting wall 35 is provided on the top surface of the top wall 31 so as to surround the cylindrical wall 32 and the stepped portion 33 and to fit and hold the check valve 40 therebetween. Furthermore, a cylindrical inner peripheral wall 36 that stands from the edge of the top wall 31 is provided on the radially outer side of the fitting wall 35. An annular seal wall 37 is provided on the lower surface of the top wall 31 so as to sandwich the inner layer body 10 and contact the inner peripheral surface of the mouth peripheral wall 22 of the outer layer body 20. Further, as shown in FIG. 1, an opening 38 is provided in the lower portion of the inner peripheral wall 36.

逆止弁４０は、その下部が、中栓３０の筒状壁３２、段部３３、及び嵌合壁３５に嵌合保持される環状壁４１を備えている。環状壁４１の径方向内側には、弾性アーム４２を介して連結する板状の弁体４３を備えていて、弁体４３により注出開口３４を閉鎖している。また弁体４３は、筒状壁３２の上部開口の大部分も覆い隠しているが、その一部は常時開口している。環状壁４１の径方向外側には、外層体２０への押圧に伴う充填空間Ｓへの加圧の際には注出キャップ６０の外気導入孔６６を閉鎖し、この加圧後の外層体２０の復元の際に外気導入孔６６を開放する外気導入孔６６用の弁体４４が設けられており、この弁体４４は、環状壁４１と一体連結されている。本実施形態で逆止弁４０は、所謂３点弁の形態をなしているが、１点弁等、従前の他の形態の逆止弁を用いることができる。また、本実施形態で環状壁４１は円筒状であるが、角筒状でもよい。更に、本実施形態の弁体４４は、環状壁４１と一体で形成されているが、環状壁４１と別体で形成してもよい。 The lower portion of the check valve 40 includes an annular wall 41 fitted and held on the cylindrical wall 32, the stepped portion 33, and the fitting wall 35 of the inner plug 30. On the radially inner side of the annular wall 41, a plate-like valve body 43 connected via an elastic arm 42 is provided, and the dispensing opening 34 is closed by the valve body 43. Further, the valve element 43 also covers most of the upper opening of the cylindrical wall 32, but a part of the valve element 43 is always open. Outside the annular wall 41 in the radial direction, the external air introduction hole 66 of the dispensing cap 60 is closed when pressurizing the filling space S accompanying the pressing of the outer layer body 20, and the outer layer body 20 after the pressurization is closed. A valve body 44 for the outside air introduction hole 66 that opens the outside air introduction hole 66 at the time of restoration is provided, and the valve body 44 is integrally connected to the annular wall 41. In the present embodiment, the check valve 40 is in the form of a so-called three-point valve, but other check valves in other forms such as a one-point valve can be used. In the present embodiment, the annular wall 41 has a cylindrical shape, but may have a rectangular tube shape. Furthermore, although the valve body 44 of this embodiment is formed integrally with the annular wall 41, it may be formed separately from the annular wall 41.

移動弁５０は、筒状壁３２内に配置されてその内周面に沿って移動可能に設けられている。本実施形態の移動弁５０は、球状をなすものであるが、中実の柱状のものや、筒状をなすとともにその内側に形成される内部通路を閉鎖する閉鎖壁を備えるもの等、種々の形態のものを用いることができる。なお、図１に示すように二重容器１を起立姿勢にする際、移動弁５０は縮径部３２ａに着座して、充填空間Ｓを閉鎖するようにしている。 The movement valve 50 is disposed in the cylindrical wall 32 and is provided so as to be movable along the inner peripheral surface thereof. The moving valve 50 of the present embodiment has a spherical shape, but has various shapes such as a solid columnar shape, a cylindrical shape, and a closed wall that closes an internal passage formed inside thereof. Forms can be used. As shown in FIG. 1, when the double container 1 is placed in the standing posture, the moving valve 50 is seated on the reduced diameter portion 32a so as to close the filling space S.

注出キャップ６０は、口部周壁２２を取り囲む外周壁６１を備えていて、外周壁６１の内周面には、口部周壁２２の雄ねじ部２２ｂに対応する雌ねじ部６２を備えている。また、外周壁６１の内側には中栓３０が嵌り込んでいる。具体的に、中栓３０は、その内周壁３６が、外周壁６１の内周面のうち雌ねじ部６２が形成されている位置よりも上側の位置に形成された凸部を乗り越えることにより、注出キャップ６０にアンダーカットで保持されている。外周壁６１の上部には、中栓３０及び逆止弁４０を覆い隠す頂壁６３を設けている。頂壁６３には、逆止弁４０の開放下にて充填空間Ｓ内の内容液を注出する注出筒６４を設けている。なお、注出筒６４は、頂壁６３の下方側にも延びていて、これにより弁体４３が過度に持ち上がった際のストッパーとしても機能している。また、頂壁６３の下面には、逆止弁４０の環状壁４１の上部を嵌合保持する同心二重配置となる一対の上部嵌合壁６５を設けている。更に、上部嵌合壁６５の径方向外側には、頂壁６３を貫通する外気導入孔６６を設けている。これにより、注出筒６４と外気導入孔６６の間が環状壁４１によって区画され、環状壁４１の径方向外側には、外気導入孔６６が開口する内部空間Ｎが形成される。なお、この内部空間Ｎには上述した弁体４４が位置しており、弁体４４により、外気導入孔６６の開放と閉鎖とが切り替えられる。 The dispensing cap 60 includes an outer peripheral wall 61 surrounding the mouth peripheral wall 22, and an inner thread surface 62 corresponding to the male thread 22 b of the mouth peripheral wall 22 is provided on the inner peripheral surface of the outer peripheral wall 61. Further, the inner plug 30 is fitted inside the outer peripheral wall 61. Specifically, the inner plug 30 has an inner peripheral wall 36 that passes over a convex portion formed at a position above the position where the female screw portion 62 is formed on the inner peripheral surface of the outer peripheral wall 61. The output cap 60 is held undercut. A top wall 63 that covers the inner plug 30 and the check valve 40 is provided on the upper portion of the outer peripheral wall 61. The top wall 63 is provided with a dispensing cylinder 64 for dispensing the content liquid in the filling space S under the opening of the check valve 40. Note that the dispensing cylinder 64 also extends to the lower side of the top wall 63, thereby functioning as a stopper when the valve body 43 is excessively lifted. In addition, a pair of upper fitting walls 65 having a concentric double arrangement for fitting and holding the upper portion of the annular wall 41 of the check valve 40 are provided on the lower surface of the top wall 63. Furthermore, an outside air introduction hole 66 that penetrates the top wall 63 is provided on the radially outer side of the upper fitting wall 65. Thus, the space between the dispensing cylinder 64 and the outside air introduction hole 66 is partitioned by the annular wall 41, and an internal space N in which the outside air introduction hole 66 is opened is formed on the radially outer side of the annular wall 41. In addition, the valve body 44 described above is located in the internal space N, and the opening and closing of the outside air introduction hole 66 are switched by the valve body 44.

また、内部空間Ｎと、外周壁６１と口部周壁２２の間に位置する溝部２４とは、開口３８を介して連通している。すなわち、注出キャップ６０の内側には、外界から内層体１０と外層体２０との相互間に外気が流れる通路として、外気導入孔６６から始まり、順に内部空間Ｎ、開口３８、及び溝部２４を経て、貫通開口２３に至る、外気導入路Ｔが形成される。 Further, the internal space N and the groove portion 24 located between the outer peripheral wall 61 and the mouth peripheral wall 22 communicate with each other through the opening 38. That is, on the inner side of the pouring cap 60, an internal space N, an opening 38, and a groove portion 24 are formed in order from the outside air introduction hole 66 as a passage through which the outside air flows between the inner layer body 10 and the outer layer body 20 from the outside. Thus, an outside air introduction path T reaching the through opening 23 is formed.

蓋体７０は、ヒンジ７１を介して注出キャップ６０の外周壁６１に連結していて、ヒンジ７１で折り曲げることで、注出筒６４及び外気導入孔６６を覆い隠すことができる。より詳細には、蓋体７０は、平板状の上壁７２と、上壁７２の縁部に連結するとともに外周壁６１に連なる形状となる蓋体周壁７３とを備えていて、上壁７２には、蓋体７０を閉めた際に注出筒６４の内側に入り込んで注出筒６４をシールする棒状のシール部７４を備えている。蓋体周壁７３は、蓋体周壁７３の内側に頂部６３の縁部を嵌合するようにして、注出キャップ６０に対して装着される。なお、蓋体７０は、ヒンジ７１を設けずに注出キャップ６０とは別体のものとし、ねじやアンダーカットで注出キャップ６０に装着するように構成してもよい。 The lid body 70 is connected to the outer peripheral wall 61 of the pouring cap 60 via a hinge 71, and can be covered with the pouring cylinder 64 and the outside air introduction hole 66 by being bent by the hinge 71. More specifically, the lid 70 includes a flat upper wall 72 and a lid peripheral wall 73 that is connected to the edge of the upper wall 72 and is continuous with the outer peripheral wall 61. Is provided with a rod-shaped seal portion 74 that enters the inside of the dispensing cylinder 64 and seals the dispensing cylinder 64 when the lid 70 is closed. The lid peripheral wall 73 is attached to the dispensing cap 60 so that the edge of the top 63 is fitted inside the lid peripheral wall 73. The lid body 70 may be a separate body from the pouring cap 60 without providing the hinge 71, and may be configured to be attached to the pouring cap 60 with screws or undercuts.

上記のように構成される二重容器１から内容液を吐出するに当たっては、蓋体７０を取り外し、二重容器１を、起立姿勢から傾倒或いは倒立姿勢に姿勢変更する。そして、外層体２０の胴部２１を押圧すると、内層体１０は、外層体２０から直接、或いは内層体１０と外層体２０との間の空気を介して押圧されて充填空間Ｓが加圧される。これにより、加圧された内容液が注出開口３４から弁体４３を押し上げて、注出開口３４から内容液が流出し、注出筒６４を通して外界に注出される。なお、外気導入路Ｔは、この一連の動作中、弁体４４により常時閉鎖している。なお、この状態において、筒状壁３２内の移動弁５０は、自重や筒状壁３２の下方側の開口から流入する内容液によって、注出筒６４側（図１中破線で示す位置）に移動している。 In discharging the content liquid from the double container 1 configured as described above, the lid 70 is removed, and the posture of the double container 1 is changed from the standing posture to the tilted or inverted posture. When the body portion 21 of the outer layer body 20 is pressed, the inner layer body 10 is pressed from the outer layer body 20 directly or via the air between the inner layer body 10 and the outer layer body 20 to pressurize the filling space S. The Thereby, the pressurized content liquid pushes up the valve body 43 from the dispensing opening 34, the content liquid flows out from the dispensing opening 34, and is poured out to the outside through the dispensing cylinder 64. The outside air introduction path T is always closed by the valve body 44 during this series of operations. In this state, the moving valve 50 in the cylindrical wall 32 is moved toward the dispensing cylinder 64 (position indicated by a broken line in FIG. 1) due to its own weight or the content liquid flowing in from the opening on the lower side of the cylindrical wall 32. Has moved.

所要量の内容液を注出した後は、外層体２０の胴部２１への押圧を解除する。これによって充填空間Ｓ内の圧力が下がり、弁体４３が注出開口３４を閉鎖するので、充填空間Ｓ内への外気の入り込みが防止できる。また、外層体２０は、それ自身の復元力により元の形状に戻ろうとし、内層体１０と外層体２０との相互間は負圧状態となるため、弁体４４が押し下がり外気導入孔６６が開放され、外気導入路Ｔを通じて外気が導入される。これにより、内層体１０を減容させたまま外層体２０のみが復元する。 After the required amount of content liquid has been poured out, the pressure on the body portion 21 of the outer layer body 20 is released. As a result, the pressure in the filling space S is lowered, and the valve body 43 closes the dispensing opening 34, so that outside air can be prevented from entering the filling space S. Further, the outer layer body 20 tries to return to its original shape by its own restoring force, and since the mutual pressure between the inner layer body 10 and the outer layer body 20 becomes a negative pressure state, the valve body 44 is pushed down and the outside air introduction hole 66 is pressed. Is opened, and outside air is introduced through the outside air introduction path T. Thereby, only the outer layer body 20 is restored while the volume of the inner layer body 10 is reduced.

弁体４３が注出開口３４を閉鎖すると、注出筒６４内には内容液が残留したままになっているものの、二重容器１を元の起立姿勢に戻すと、移動弁５０は、それ自身の自重や充填空間Ｓ内の圧力低下によって下方に移動する。これによって筒状壁３２の上方には、移動弁５０が移動した分のスペースが形成されることになるため、このスペース分に相当する分の内容液を注出筒６４から引き戻すことができ（サックバック機能）、液だれを有効に防止することができる。なお、下方に移動した移動弁５０は、筒状壁３２の縮径部３２ａに着座するので、充填空間Ｓ内を閉鎖した状態に保つことができる。 When the valve body 43 closes the dispensing opening 34, the content liquid remains in the dispensing cylinder 64. However, when the double container 1 is returned to the original standing posture, the moving valve 50 It moves downward due to its own weight or a pressure drop in the filling space S. As a result, a space corresponding to the amount of movement of the movement valve 50 is formed above the cylindrical wall 32, so that the content liquid corresponding to this space can be pulled back from the dispensing cylinder 64 ( Suckback function) and dripping can be effectively prevented. In addition, since the moving valve 50 moved downward is seated on the reduced diameter portion 32a of the cylindrical wall 32, the inside of the filling space S can be kept closed.

ここで、口部周壁２２の大径部２７の外周面と、外周壁６１の内周面とは、貫通開口２３よりも下側の位置で当接して、外気導入路Ｔの下端を閉塞するシール部８０を形成している。図２は、図１のうちシール部８０を含む一部を拡大した拡大断面図である。図２に示すように、シール部８０は、大径部２７の外周面に対し、外周壁６１の内周面のうち雌ねじ部６２が形成されている位置よりも下側の位置に形成された環状凸部６１ａを気密に当接させることにより形成されている。なお、シール部８０は、大径部２７の外周面に環状凸部を設ける構成としてもよい。また、例えば、凹凸部を有さない口部周壁の外周面及び外周壁の内周面を、互いに密着するように嵌合してシール部を形成してもよい。 Here, the outer peripheral surface of the large-diameter portion 27 of the mouth peripheral wall 22 and the inner peripheral surface of the outer peripheral wall 61 are in contact with each other at a position below the through opening 23 to close the lower end of the outside air introduction path T. A seal portion 80 is formed. FIG. 2 is an enlarged cross-sectional view in which a part including the seal portion 80 in FIG. 1 is enlarged. As shown in FIG. 2, the seal portion 80 is formed at a position lower than the position where the internal thread portion 62 is formed on the inner peripheral surface of the outer peripheral wall 61 with respect to the outer peripheral surface of the large-diameter portion 27. It is formed by bringing the annular convex portion 61a into airtight contact. The seal portion 80 may have a configuration in which an annular convex portion is provided on the outer peripheral surface of the large diameter portion 27. Moreover, for example, the seal portion may be formed by fitting the outer peripheral surface of the mouth peripheral wall and the inner peripheral surface of the outer peripheral wall so as to be in close contact with each other.

また、図１、図２に示すように、外周壁６１の下端６７は、雄ねじ部２２ｂと雌ねじ部６２とを螺合した状態において、シール部８０よりも下側で外層体２０の肩部２５の上面２９に当接するように構成されている。更に、図２に示すように、この状態において、中栓３０の天壁３１の下面と、口部周壁２２の上端面２８との間には間隙Ｄが形成されている。すなわち、外層体２０に対して注出キャップ６０を装着する際に、雄ねじ部２２ｂと雌ねじ部６２とを螺合させるように注出キャップ６０を回転させていくと、天壁３１の下面、具体的にはシール壁３７に対して径方向外側で隣接する環状の下面部３９が、口部周壁２２の上端面２８と、内層体１０の上端部１１を介して当接する前に、外周壁６１の下端６７が肩部２５の上面２９に当接する。 As shown in FIGS. 1 and 2, the lower end 67 of the outer peripheral wall 61 has a shoulder portion 25 of the outer layer body 20 below the seal portion 80 in a state where the male screw portion 22 b and the female screw portion 62 are screwed together. It is comprised so that it may contact | abut to the upper surface 29 of this. Further, as shown in FIG. 2, in this state, a gap D is formed between the lower surface of the top wall 31 of the inner plug 30 and the upper end surface 28 of the mouth peripheral wall 22. That is, when the pouring cap 60 is attached to the outer layer body 20, if the pouring cap 60 is rotated so that the male screw portion 22 b and the female screw portion 62 are screwed together, the lower surface of the top wall 31, specifically Specifically, before the annular lower surface portion 39 adjacent to the seal wall 37 on the outer side in the radial direction comes into contact with the upper end surface 28 of the mouth peripheral wall 22 via the upper end portion 11 of the inner layer body 10, the outer peripheral wall 61. Is in contact with the upper surface 29 of the shoulder 25.

外層体２０の肩部２５の形状は、例えばブロー成形において形成される際に金型の合わせ目で形成されることになる口部周壁２２の上端面２８と異なり、金型のキャビティ面で形成されるので成型によるばらつきが小さい。従って、外周壁６１の下端６７が外層体２０の肩部２５に当接する位置をキャッピング完了位置とすれば、中栓３０の天壁３１の下面を上端面２８に当接させる位置をキャッピング完了位置とする場合と比較して、注出キャップ６０を一定トルクで締める際に、注出キャップ６０の締め位置のばらつきが抑制される。また、中栓３０の天壁３１の下面と、口部周壁２２の上端面２８との間に間隙Ｄが形成されるようにキャッピングするため、中栓の下面を上端面に当接させるまで締め付けるようにキャッピングする場合と比較して、上端面２８にトルクにより局所的な負荷が加わることがなく、上端面２８が変形してしまうことを抑制できる。 The shape of the shoulder portion 25 of the outer layer body 20 is formed on the cavity surface of the mold, unlike the upper end surface 28 of the peripheral wall 22 of the mouth portion that is formed at the joint of the mold when formed in, for example, blow molding. Therefore, variation due to molding is small. Therefore, if the position where the lower end 67 of the outer peripheral wall 61 contacts the shoulder 25 of the outer layer body 20 is the capping completion position, the position where the lower surface of the top wall 31 of the inner plug 30 contacts the upper end surface 28 is the capping completion position. As compared with the case where the extraction cap 60 is tightened with a constant torque, variation in the tightening position of the extraction cap 60 is suppressed. Further, since capping is performed so that a gap D is formed between the lower surface of the top wall 31 of the inner plug 30 and the upper end surface 28 of the mouth peripheral wall 22, the inner plug is tightened until the lower surface of the inner plug contacts the upper end surface. As compared with the case of capping as described above, a local load is not applied to the upper end surface 28 by torque, and deformation of the upper end surface 28 can be suppressed.

なお、本実施形態では、外層体２０の口部周壁２２の上端面２８上に、内層体１０の上端部１１を積層した構成としているが、これに限られるものではなく、例えば、外層体の口部周壁の内周面に内層体の上端部を積層させ、口部周壁の上端面上には内層体の上端部を積層させない構成とすることもできる。かかる場合には、外層体に対して注出キャップを装着する際に、中栓の天壁の下面が、外層体の口部周壁の上端面と直接当接する前に、注出キャップの外周壁の下端が外層体の肩部の上面に当接する。 In the present embodiment, the upper end portion 11 of the inner layer body 10 is laminated on the upper end surface 28 of the mouth peripheral wall 22 of the outer layer body 20, but the present invention is not limited to this. The upper end portion of the inner layer body may be stacked on the inner peripheral surface of the mouth peripheral wall, and the upper end portion of the inner layer body may not be stacked on the upper end surface of the mouth peripheral wall. In such a case, when the pouring cap is attached to the outer layer body, the outer peripheral wall of the pouring cap is placed before the lower surface of the top wall of the inner plug comes into direct contact with the upper end surface of the outer peripheral wall of the outer layer body. The lower end of the abutment comes into contact with the upper surface of the shoulder portion of the outer layer body.

また、肩部２５の上面２９は、口部周壁２２の中心軸線Ｏ方向と直交する方向に延在する環状の平面である。そのため、注出キャップ６０を外層体２０に装着する際に、回転しながら中心軸線Ｏ方向に移動する外周壁６１の下端６７を、肩部２５の上面２９上で滑ることなく、肩部２５の上面２９に対して確実に突き当て、位置決めすることができる。 Further, the upper surface 29 of the shoulder portion 25 is an annular flat surface extending in a direction orthogonal to the direction of the central axis O of the mouth peripheral wall 22. Therefore, when the pouring cap 60 is attached to the outer layer body 20, the lower end 67 of the outer peripheral wall 61 that moves in the direction of the central axis O while rotating is not slipped on the upper surface 29 of the shoulder portion 25, and The upper surface 29 can be reliably abutted and positioned.

更に、シール部８０を形成する口部周壁２２の外周面（大径部２７の外周面）と、肩部２５の上面２９とは連続している。具体的に、シール部８０は、外周壁６１の内周面の下端部領域と、口部周壁２２の外周面の下端部領域（大径部２７の外周面）とで形成されている。そして、肩部２５の上面２９は、大径部２７の外周面の下端に連続する、中心軸線Ｏ方向と直交する方向に延在する環状の平面である。このように、シール部８０を形成する口部周壁２２の外周面（大径部２７の外周面）と、肩部２５の上面２９とを連続して形成することにより、注出キャップ６０を装着する際に、外周壁６１の内周面の下端部領域は、口部周壁２２の外周面のうちシール部８０を形成する部分（大径部２７の外周面）に案内されながら下方に移動し、外周壁６１の下端６７を確実に肩部２５の上面２９に当接させることができる。すなわち、口部周壁２２の外周面のうちシール部８０を形成する部分（大径部２７の外周面）を、外周壁６１の下端６７が肩部２５の上面２９の所望の位置に確実に当接するように案内するガイドとして機能させることができる。 Furthermore, the outer peripheral surface (outer peripheral surface of the large diameter portion 27) of the mouth peripheral wall 22 forming the seal portion 80 and the upper surface 29 of the shoulder portion 25 are continuous. Specifically, the seal portion 80 is formed by the lower end region of the inner peripheral surface of the outer peripheral wall 61 and the lower end region of the outer peripheral surface of the mouth peripheral wall 22 (the outer peripheral surface of the large diameter portion 27). The upper surface 29 of the shoulder portion 25 is an annular flat surface extending in a direction orthogonal to the central axis O direction and continuing from the lower end of the outer peripheral surface of the large diameter portion 27. In this way, by continuously forming the outer peripheral surface of the mouth peripheral wall 22 (the outer peripheral surface of the large-diameter portion 27) and the upper surface 29 of the shoulder portion 25 that form the seal portion 80, the dispensing cap 60 is attached. In this case, the lower end region of the inner peripheral surface of the outer peripheral wall 61 moves downward while being guided by the portion (the outer peripheral surface of the large diameter portion 27) that forms the seal portion 80 of the outer peripheral surface of the mouth peripheral wall 22. The lower end 67 of the outer peripheral wall 61 can be reliably brought into contact with the upper surface 29 of the shoulder portion 25. In other words, the portion of the outer peripheral surface of the mouth peripheral wall 22 that forms the seal portion 80 (the outer peripheral surface of the large-diameter portion 27) is securely contacted with the desired position of the upper surface 29 of the shoulder 25 by the lower end 67 of the outer peripheral wall 61. It can be made to function as a guide which guides so that it may touch.

１：二重容器
１０：内層体
１１：上端部
２０：外層体
２１：胴部
２２：口部周壁
２２ａ：上部開口
２２ｂ：雄ねじ部
２３：貫通開口
２４：溝部
２５：肩部
２６：小径部
２７：大径部
２８：上端面
２９：肩部の上面
３０：中栓
３１：天壁
３２：筒状壁
３２ａ：縮径部
３３：段部
３４：注出開口
３５：嵌合壁
３６：内周壁
３７：シール壁
３８：開口
３９：環状の下面部
４０：逆止弁
４１：環状壁
４２：弾性アーム
４３：弁体
４４：弁体
５０：移動弁
６０：注出キャップ
６１：外周壁
６１ａ：環状凸部
６２：雌ねじ部
６３：頂壁
６４：注出筒
６５：上部嵌合壁
６６：外気導入孔
６７：下端
７０：蓋体
７１：ヒンジ
７２：上壁
７３：蓋体周壁
７４：シール部
８０：シール部
Ｄ：間隙
Ｏ：口部周壁の中心軸線
Ｎ：内部空間
Ｓ：充填空間
Ｔ：外気導入路 1: Double container 10: Inner layer body 11: Upper end portion 20: Outer layer body 21: Body portion 22: Mouth peripheral wall 22a: Upper opening 22b: Male screw portion 23: Through opening 24: Groove portion 25: Shoulder portion 26: Small diameter portion 27 : Large diameter portion 28: Upper end surface 29: Upper surface 30 of shoulder portion: Inner plug 31: Top wall 32: Cylindrical wall 32a: Reduced diameter portion 33: Stepped portion 34: Outlet opening 35: Fitting wall 36: Inner peripheral wall 37: seal wall 38: opening 39: annular lower surface portion 40: check valve 41: annular wall 42: elastic arm 43: valve body 44: valve body 50: moving valve 60: dispensing cap 61: outer peripheral wall 61a: annular Convex part 62: Female thread part 63: Top wall 64: Dispensing tube 65: Upper fitting wall 66: Outside air introduction hole 67: Lower end 70: Lid body 71: Hinge 72: Upper wall 73: Lid peripheral wall 74: Seal part 80 : Sealing part D: Gap O: Center axis of mouth peripheral wall N: Internal space S: Filling space T: Outside air introduction path

Claims

A volume-deformable inner layer body having a content liquid filling space, and an outer layer body that houses the inner layer body therein and introduces air between the inner layer body from a through opening provided in a peripheral wall of the mouth; and A top wall that covers the upper opening of the peripheral wall of the mouth, an inner plug provided with a pouring opening that leads to the filling space in the top wall, a pouring cylinder that pours the content liquid through the pouring opening, and the outside A double container comprising: an outside air introduction hole that communicates; and an outer peripheral wall that is mounted on the peripheral wall of the mouth, and a pouring cap that holds the inner plug inside,
The outer peripheral surface of the peripheral wall of the mouth and the inner peripheral surface of the outer peripheral wall are in contact with each other at a position below the through opening to form a seal portion,
When the pouring cap is attached to the outer layer body, before the lower end of the inner plug that faces the upper end surface of the mouth peripheral wall comes into contact with the mouth peripheral wall, the lower end of the outer peripheral wall is The double container, which is in contact with the upper surface of the shoulder portion of the outer layer body below the seal portion.

2. The double container according to claim 1, wherein the upper surface of the shoulder portion is an annular flat surface extending in a direction orthogonal to a central axis direction of the mouth peripheral wall.

The double container according to claim 1 or 2, wherein the outer peripheral surface of the mouth peripheral wall forming the seal portion and the upper surface of the shoulder portion are continuous.