JP2023151324A - double container - Google Patents

Abstract

To provide a double container easily attaining easy separation.SOLUTION: A double container 1 includes a mouth part 4, a body part 5 having a diameter larger than that of the mouth part 4, a heel part 6 and a bottom part 7 in this order, and is formed of the outer layer body 2a and an inner layer body 2b laminated on the inside of the outer layer body 2a so as to be peelable. The inner layer body 2b has a screw part 4e screwed to the inner peripheral surface of the outer layer body 2a at the mouth part 4. At least the lower end part 5e of the body part 5 is gradually increased upward from the upper edge of the heel part 6.SELECTED DRAWING: Figure 1

Description

本発明は二重容器に関する。 The present invention relates to a double container.

外層体と外層体の内側に剥離可能に積層される内層体とによって形成される二重容器が知られている（例えば特許文献１参照）。 A double container is known that is formed by an outer layer and an inner layer that is peelably laminated inside the outer layer (for example, see Patent Document 1).

特表２００９－５１８２４５号公報Special Publication No. 2009-518245

上記のような二重容器は、リサイクル性などの観点から、内層体を外層体から容易に分別できれば望ましい。 From the viewpoint of recyclability, the double-layered container as described above is desirable if the inner layer can be easily separated from the outer layer.

そこで本発明の目的は、容易な分別を実現し易い二重容器を提供することにある。 Therefore, it is an object of the present invention to provide a double container that facilitates easy separation.

本発明の二重容器は、口部、口部よりも拡径する胴部、ヒール部及び底部をこの順に有し、外層体と前記外層体の内側に剥離可能に積層される内層体とによって形成され、前記内層体が、前記口部において前記外層体の内周面に螺脱可能に螺合する螺合部を有し、少なくとも前記胴部の下端部が、前記ヒール部の上端から上方に向けて徐々に拡径する、二重容器である。 The double container of the present invention has a mouth, a body whose diameter is larger than the mouth, a heel, and a bottom in this order, and includes an outer layer and an inner layer removably laminated inside the outer layer. the inner layer body has a threaded portion that is removably screwed onto the inner circumferential surface of the outer layer body at the mouth portion, and at least a lower end portion of the body portion is arranged upwardly from an upper end of the heel portion. It is a double container that gradually expands in diameter towards.

本発明の二重容器は、上記構成において、前記胴部の前記下端部が、前記ヒール部の上端から胴部の全高に対する１５％の高さの部分までにわたる部分として定義され、前記二重容器の中心軸線を含む縦断面において、前記胴部の前記下端部における下端と上端を結ぶ直線が前記中心軸線に対して２０°以下の角度で傾く、二重容器であるのが好ましい。 In the double container of the present invention, in the above configuration, the lower end of the body is defined as a portion extending from the upper end of the heel to a height of 15% of the total height of the body, and the double container It is preferable that the container is a double container, in which a straight line connecting the lower end and the upper end of the lower end of the body is inclined at an angle of 20° or less with respect to the central axis in a longitudinal section including the central axis.

本発明によれば、容易な分別を実現し易い二重容器を提供することができる。 According to the present invention, it is possible to provide a double container that facilitates easy separation.

本発明の一実施形態の二重容器を示す一部断面側面図である。FIG. 1 is a partially cross-sectional side view showing a double container according to an embodiment of the present invention. 図１に示す二重容器の分別時の様子を示す一部断面側面図である。FIG. 2 is a partially sectional side view showing the double container shown in FIG. 1 during sorting. 図２の部分拡大図である。3 is a partially enlarged view of FIG. 2. FIG. 図１に示す二重容器の変形例の分別時の様子を示す一部断面側面図である。FIG. 2 is a partially sectional side view showing a modified example of the double container shown in FIG. 1 during sorting.

以下、図面を参照しつつ本発明の実施形態を例示説明する。 Embodiments of the present invention will be described below by way of example with reference to the drawings.

図１に示すように、本発明の一実施形態において二重容器１は、口部４、胴部５、ヒール部６及び底部７をこの順に有する容器本体２と、口部４に取り付けられるキャップ３と、を有する。なお、二重容器１はキャップ３を有する構成に限らず、例えば、口部４に取り付けられる吐出具（ポンプ等）を有する構成としてもよい。容器本体２は、外層体２ａと外層体２ａの内側に剥離可能に積層される内層体２ｂとによって形成される。 As shown in FIG. 1, in one embodiment of the present invention, a double container 1 includes a container body 2 having a mouth portion 4, a body portion 5, a heel portion 6, and a bottom portion 7 in this order, and a cap attached to the mouth portion 4. 3 and has. Note that the double container 1 is not limited to the structure having the cap 3, but may have a structure having a discharge tool (such as a pump) attached to the mouth portion 4, for example. The container body 2 is formed of an outer layer 2a and an inner layer 2b that is removably laminated inside the outer layer 2a.

外層体２ａは、口部４を構成する部分である外口部４ａと、胴部５を構成する部分である外胴部５ａと、ヒール部６を構成する部分である外ヒール部６ａと、底部７を構成する部分である外底部７ａと、を有する。また内層体２ｂは、口部４を構成する部分である内口部４ｂと、胴部５を構成する部分である内胴部５ｂと、ヒール部６を構成する部分である内ヒール部６ｂと、底部７を構成する部分である内底部７ｂと、を有する。外層体２ａと内層体２ｂは、胴部５、ヒール部６及び底部７において剥離可能に接触する。 The outer layer body 2a includes an outer mouth portion 4a that is a portion that constitutes the mouth portion 4, an outer trunk portion 5a that is a portion that constitutes the trunk portion 5, and an outer heel portion 6a that is a portion that constitutes the heel portion 6. It has an outer bottom part 7a which is a part constituting the bottom part 7. In addition, the inner layer body 2b includes an inner mouth portion 4b that is a portion that constitutes the mouth portion 4, an inner trunk portion 5b that is a portion that constitutes the trunk portion 5, and an inner heel portion 6b that is a portion that constitutes the heel portion 6. , and an inner bottom portion 7b that constitutes the bottom portion 7. The outer layer body 2a and the inner layer body 2b are in peelable contact with each other at the body portion 5, heel portion 6, and bottom portion 7.

なお、本願における「剥離」とは、接着状態又は接着力が殆ど介在しない擬似接着状態から内層体２ｂと外層体２ａが離れる場合だけでなく、接着力が介在しない接触状態から内層体２ｂと外層体２ａが離れる場合も含む。 In addition, "peel" in this application refers not only to the case where the inner layer 2b and the outer layer 2a separate from an adhesive state or a pseudo-adhesive state where there is almost no adhesive force, but also when the inner layer 2b and the outer layer 2a separate from a contact state where no adhesive force is involved. This also includes the case where the body 2a separates.

容器本体２は、２軸延伸可能なポリエチレンテレフタレート（ＰＥＴ）樹脂を例えば射出成形して形成される外プリフォームと、ポリプロピレン（ＰＰ）樹脂（ホモポリマー、ランダムコポリマー、ブロックコポリマーのいずれであるかを問わない）を例えば射出成形して形成される内プリフォームとを組み合わせた二重構造のプリフォーム組み立て体を二軸延伸ブロー成形することによって形成される。なお、外プリフォームは外層体２ａに対応し、内プリフォームは内層体２ｂに対応する。 The container body 2 includes an outer preform formed by injection molding biaxially stretchable polyethylene terephthalate (PET) resin, and a polypropylene (PP) resin (whether homopolymer, random copolymer, or block copolymer). It is formed by biaxially stretch blow molding a double-structured preform assembly in which an inner preform is formed by, for example, injection molding. Note that the outer preform corresponds to the outer layer body 2a, and the inner preform corresponds to the inner layer body 2b.

２軸延伸可能なポリエチレンテレフタレート樹脂としては、例えばホモＰＥＴ等が挙げられるが、ＩＰＡ（イソフタル酸）変性ＰＥＴ又はＣＨＤＭ変性ＰＥＴ等の他のＰＥＴを用いてもよい。外プリフォームは、ポリエチレンテレフタレート樹脂製に限らず、例えばポリプロピレン（ＰＰ）樹脂製やポリエチレン（ＰＥ）樹脂製など、他の樹脂材料により形成してもよい。外プリフォームは単層構造に限らず、主材層に加えてバリア性等の機能を向上させる１層以上の機能層も含む複数層構造としてもよい。 Examples of the biaxially stretchable polyethylene terephthalate resin include homoPET, but other PETs such as IPA (isophthalic acid) modified PET or CHDM modified PET may also be used. The outer preform is not limited to being made of polyethylene terephthalate resin, but may be made of other resin materials such as polypropylene (PP) resin or polyethylene (PE) resin. The outer preform is not limited to a single layer structure, but may have a multilayer structure including one or more functional layers for improving functions such as barrier properties in addition to the main material layer.

内プリフォームは、ポリプロピレン樹脂製に限らず、内層体２ｂが外層体２ａから剥離可能となる材料から適宜選択することができ、例えばポリエチレン（ＰＥ）樹脂製や２軸延伸可能なポリエチレンテレフタレート樹脂製などにより形成してもよい。内プリフォームは単層構造に限らず、主材層に加えてバリア性等の機能を向上させる１層以上の機能層も含む複数層構造としてもよい。 The inner preform is not limited to polypropylene resin, and may be appropriately selected from materials that allow the inner layer 2b to be peeled from the outer layer 2a, such as polyethylene (PE) resin or biaxially stretchable polyethylene terephthalate resin. It may also be formed by, for example. The inner preform is not limited to a single-layer structure, but may have a multi-layer structure including one or more functional layers that improve functions such as barrier properties in addition to the main material layer.

内層体２ｂと外層体２ａの分離性を高めるために、内プリフォームの外面と外プリフォームの内面との少なくとも一方にシリコンからなる層を例えば塗布によって設けてもよい。 In order to enhance the separability between the inner layer body 2b and the outer layer body 2a, a layer made of silicon may be provided on at least one of the outer surface of the inner preform and the inner surface of the outer preform, for example, by coating.

なお、容器本体２は、上記のようなプリフォーム組み立て体をブロー成形して得られるものに限らない。 Note that the container body 2 is not limited to one obtained by blow molding a preform assembly as described above.

容器本体２は、図示しない内容物を収容する収容空間Ｓを内層体２ｂの内面によって形成する。内容物は特に限定されず、例えば液体である。 In the container body 2, a storage space S for storing contents (not shown) is formed by the inner surface of the inner layer body 2b. The contents are not particularly limited, and are, for example, liquid.

本実施形態では、二重容器１の中心軸線Ｏに沿う方向を上下方向といい、底部７から口部４に向かう方向を上方といい、その反対方向を下方といい、中心軸線Ｏに直交する直線に沿う方向を径方向といい、中心軸線Ｏを周回する方向を周方向といい、中心軸線Ｏを含む断面を縦断面という。 In this embodiment, the direction along the central axis O of the double container 1 is referred to as the up-down direction, the direction from the bottom 7 to the mouth 4 is referred to as the upper direction, and the opposite direction is referred to as the lower direction, which is orthogonal to the central axis O. The direction along the straight line is called the radial direction, the direction around the center axis O is called the circumferential direction, and the cross section including the center axis O is called the longitudinal section.

口部４は、中心軸線Ｏを中心とする筒状をなし、通常は、図示するような円筒状をなす。より具体的には口部４は、外口部４ａと内口部４ｂとで構成される２重筒状をなし、通常は、図示するような２重円筒状をなす。口部４（より詳細には、外口部４ａと、内口部４ｂの下端部を除く部分）は、２軸延伸ブロー成形時に実質的に延伸されず、成形後もプリフォーム組み立て体の時と同等の形状を有する。 The mouth portion 4 has a cylindrical shape centered on the central axis O, and usually has a cylindrical shape as shown. More specifically, the opening 4 has a double cylindrical shape composed of an outer opening 4a and an inner opening 4b, and usually has a double cylindrical shape as shown. The mouth part 4 (more specifically, the outer mouth part 4a and the part of the inner mouth part 4b excluding the lower end) is not substantially stretched during biaxial stretch blow molding, and even after molding, when the preform is assembled. It has a shape equivalent to .

外口部４ａの外周面は、径方向に突出するとともに周方向に連続して延びるネックリング４ｃを有する。なお、ネックリング４ｃは周方向に断続して延びる構成としてもよい。また、ネックリング４ｃを設けない構成としてもよい。外口部４ａの内周面は、内口部４ｂの螺合部４ｅに螺脱可能に螺合し中心軸線Ｏを中心とする雌ねじ状をなす被螺合部４ｄを有する。なお被螺合部４ｄは、雌ねじ状に限らず、螺合部４ｅに螺脱可能に螺合する構成であればよい。 The outer peripheral surface of the outer opening 4a has a neck ring 4c that projects in the radial direction and extends continuously in the circumferential direction. Note that the neck ring 4c may be configured to extend intermittently in the circumferential direction. Alternatively, a configuration may be adopted in which the neck ring 4c is not provided. The inner circumferential surface of the outer opening 4a has a threaded part 4d that is removably threaded into the threaded part 4e of the inner opening 4b and has a female thread shape centered on the central axis O. Note that the screwed portion 4d is not limited to a female thread shape, and may have any structure as long as it can be screwed into the screwed portion 4e in a removable manner.

内口部４ｂの外周面は、外口部４ａの内周面の被螺合部４ｄに螺脱可能に螺合し中心軸線Ｏを中心とする雄ねじ状をなす螺合部４ｅを有する。なお螺合部４ｅは、雄ねじ状に限らず、被螺合部４ｄに螺脱可能に螺合する構成であればよい。 The outer circumferential surface of the inner opening 4b has a threaded portion 4e that is removably screwed into the threaded portion 4d of the inner circumferential surface of the outer opening 4a and has a male thread shape centered on the central axis O. Note that the threaded part 4e is not limited to a male thread shape, and may have any structure as long as it is threadably engaged with the threaded part 4d.

なお、螺合部４ｅと被螺合部４ｄはそれぞれ、１条ねじとして構成してもよいし、２条以上の多条ねじとして構成してもよいし、間欠ねじとして構成してもよい。 The threaded portion 4e and the threaded portion 4d may each be configured as a single thread, a multiple thread with two or more threads, or an intermittent thread.

また内口部４ｂは、螺合部４ｅを被螺合部４ｄに螺合させた状態で外口部４ａの上端面に全周に亘って接するように径方向外側に突出する段差部４ｆを有する。段差部４ｆは、内口部４ｂから径方向外側に突出するとともに周方向に連続して延びるフランジ４ｇの下面によって形成される。なお段差部４ｆは、外口部４ａの上端面に全周に亘って接する構成に限らず、外口部４ａの上端面に周方向の所定箇所のみにおいて接する構成としてもよい。また段差部４ｆは、フランジ４ｇの下面によって形成される構成に限らない。 In addition, the inner opening 4b has a stepped portion 4f that protrudes radially outward so as to be in contact with the upper end surface of the outer opening 4a over the entire circumference in a state in which the screwing portion 4e is screwed into the screwed portion 4d. have The step portion 4f is formed by the lower surface of a flange 4g that projects radially outward from the inner opening 4b and extends continuously in the circumferential direction. Note that the stepped portion 4f is not limited to a configuration in which it contacts the upper end surface of the outer opening portion 4a over the entire circumference, but may be configured to contact the upper end surface of the outer opening portion 4a only at a predetermined location in the circumferential direction. Further, the stepped portion 4f is not limited to the configuration formed by the lower surface of the flange 4g.

内口部４ｂの上端部（段差部４ｆよりも上方の部分）は、外層体２ａに対して中心軸線Ｏを中心にキャップ３と共回り可能にキャップ３に取り付けられる。より具体的には内口部４ｂの上端部は、キャップ３に対して凹凸形状同士の係合により、周方向の回転と上下方向の移動を規制され且つ取り付けられる。 The upper end portion (a portion above the stepped portion 4f) of the inner opening portion 4b is attached to the cap 3 so as to be able to rotate together with the cap 3 about the central axis O with respect to the outer layer body 2a. More specifically, the upper end of the inner opening 4b is attached to the cap 3 by engagement of the concave and convex shapes with each other, while restricting rotation in the circumferential direction and movement in the vertical direction.

胴部５は、口部４の下端に連なり、中心軸線Ｏを中心とし、口部４よりも拡径する筒状をなす。より具体的には、胴部５は、口部４の下端から下方に向けて徐々に拡径する肩領域５ｃと、肩領域５ｃの下端から下方に延びる胴本体領域５ｄと、を有する。胴部５は、図示しない周リブや縦リブを有する構成としてもよく、そのような構成の場合においても、概略円形状をなす水平断面形状を全高にわたって有するのが好ましい。 The body portion 5 is continuous with the lower end of the mouth portion 4, has a cylindrical shape centered on the central axis O, and has a diameter larger than that of the mouth portion 4. More specifically, the body portion 5 has a shoulder region 5c whose diameter gradually increases downward from the lower end of the mouth portion 4, and a body body region 5d which extends downward from the lower end of the shoulder region 5c. The body portion 5 may have a configuration having circumferential ribs and vertical ribs (not shown), and even in such a configuration, it is preferable to have a generally circular horizontal cross-sectional shape over the entire height.

ヒール部６は、縦断面において底部７の接地部７ｃの外周縁から上方に向けて曲がる部分である。本実施形態では、ヒール部６は縦断面において底部７の接地部７ｃの外周縁から所定の曲率で容器外側に凸となるように湾曲し、胴部５の下端に連なる。なお、ヒール部６は、湾曲部に限らず、屈曲部として構成してもよい。 The heel portion 6 is a portion that bends upward from the outer peripheral edge of the grounding portion 7c of the bottom portion 7 in a longitudinal section. In the present embodiment, the heel portion 6 is curved in a longitudinal section from the outer peripheral edge of the grounding portion 7c of the bottom portion 7 so as to be convex to the outside of the container at a predetermined curvature, and continues to the lower end of the body portion 5. Note that the heel portion 6 is not limited to a curved portion, and may be configured as a bent portion.

底部７は、底部７の外周縁を形成し、周方向に全周にわたって連続して延びる接地部７ｃと、接地部７ｃよりも径方向内側で容器内側に凸となる底凹部７ｄと、を有する。なお、接地部７ｃは全周にわたって連続して延びる構成に限らず、周方向に断続して延びる構成としてもよい。また、底部７は底凹部７ｄを有する構成に限らず、例えば底部７の全面を接地部７ｃとして構成してもよい。 The bottom part 7 has a grounding part 7c that forms the outer peripheral edge of the bottom part 7 and extends continuously over the entire circumference in the circumferential direction, and a bottom recessed part 7d that is radially inner than the grounding part 7c and protrudes toward the inside of the container. . Note that the ground contact portion 7c is not limited to a configuration in which it extends continuously over the entire circumference, but may be configured to extend intermittently in the circumferential direction. Further, the bottom portion 7 is not limited to having the bottom recessed portion 7d, but may be configured such that the entire surface of the bottom portion 7 is a grounding portion 7c.

本実施形態の二重容器１は、内容物を使い切って廃棄する際などに、図２に示すように、外層体２ａに対してキャップ３を内口部４ｂとともに捻り、螺合部４ｅを被螺合部４ｄに対して上方に螺脱させる操作により、ねじの力を利用して小さな操作力で内層体２ｂ全体を外層体２ａに対して持ち上げて分離させることができる。このとき、外層体２ａに密着している内層体２ｂが、外層体２ａより剥離する。しかし、例えば胴本体領域５ｄが上下方向に一定の径を有する構成の場合には、内ヒール部６ｂ付近において内層体２ｂが外層体２ａの内周面に強く接触し、高い摩擦抵抗を生じ易く、その結果、内層体２ｂを外層体２ａ内から抜き出すのが難しい場合がある。 In the double container 1 of this embodiment, when the contents are used up and discarded, as shown in FIG. By unscrewing the threaded portion 4d upward, the entire inner layer body 2b can be lifted and separated from the outer layer body 2a with a small operating force using the force of the screw. At this time, the inner layer 2b that is in close contact with the outer layer 2a is peeled off from the outer layer 2a. However, for example, in the case where the trunk body region 5d has a constant diameter in the vertical direction, the inner layer 2b comes into strong contact with the inner circumferential surface of the outer layer 2a near the inner heel portion 6b, which tends to cause high frictional resistance. As a result, it may be difficult to extract the inner layer body 2b from the outer layer body 2a.

そこで、本実施形態の二重容器１は、そのような摩擦抵抗を抑制するために、少なくとも胴部５の下端部５ｅがヒール部６の上端から上方に向けて徐々に拡径するように構成される。 Therefore, in order to suppress such frictional resistance, the double container 1 of the present embodiment is configured such that at least the lower end portion 5e of the body portion 5 gradually expands in diameter upward from the upper end of the heel portion 6. be done.

このような構成によれば、螺合部４ｅを被螺合部４ｄから螺脱させるのに伴って内層体２ｂが上昇する際に内ヒール部６ｂが外胴部５ａの内周面に接触しにくくなり、その結果、容易な分別を実現することができる。 According to such a configuration, when the inner layer body 2b rises as the threaded portion 4e is screwed off from the threaded portion 4d, the inner heel portion 6b comes into contact with the inner circumferential surface of the outer body portion 5a. As a result, easy separation can be realized.

このような効果を得易くするためには、胴部５の下端部５ｅは、ヒール部６の上端から胴部５の全高に対する１５％の高さの部分までにわたる部分として定義するのが好ましい。すなわち、胴部５の下端部５ｅの下端Ｐ１はヒール部６の上端に位置し、胴部５の下端部５ｅの上端Ｐ２は胴部５の全高に対する１５％の高さの部分に位置するのが好ましい。この場合、胴部５の下端部５ｅの上端Ｐ２の高さｈは、胴部５の上端の高さＨの１５％となる。なお、高さとは、接地部７ｃからの高さである。 In order to easily obtain such an effect, it is preferable that the lower end portion 5e of the trunk portion 5 is defined as a portion extending from the upper end of the heel portion 6 to a portion at a height of 15% of the total height of the trunk portion 5. That is, the lower end P1 of the lower end 5e of the trunk 5 is located at the upper end of the heel 6, and the upper end P2 of the lower end 5e of the trunk 5 is located at a height of 15% of the total height of the trunk 5. is preferred. In this case, the height h of the upper end P2 of the lower end portion 5e of the trunk 5 is 15% of the height H of the upper end of the trunk 5. Note that the height is the height from the grounding portion 7c.

また、上記効果を得易くするためには、胴部５の下端部５ｅは、縦断面において、胴部５の下端部５ｅにおける下端Ｐ１と上端Ｐ２を結ぶ直線が中心軸線Ｏに対して２０°以下の角度θで傾くように構成するのが好ましい。例えば、胴部５の下端部５ｅの上端Ｐ２よりも上側の胴本体領域５ｄを上下方向に径が一定の円筒状に構成した場合には、内胴部５ｂの下端部５ｅの上端が最大径部分となり、角度θが２０°を超えると当該部分で分別時の上記摩擦抵抗を生じ易くなってしまう。また、胴部５の下端部５ｅの上端Ｐ２よりも上側の胴本体領域５ｄを、胴部５の下端部５ｅと同じ傾斜角度の傾斜面状に構成した場合には、胴本体領域５ｄの上端側部分が大きく不安定となり、且つ、外観や操作性（持ち易さ等）に劣ることとなってしまう。 Further, in order to easily obtain the above effect, the lower end portion 5e of the trunk portion 5 is such that the straight line connecting the lower end P1 and the upper end P2 of the lower end portion 5e of the trunk portion 5 is 20° with respect to the central axis O. It is preferable to configure it so that it is tilted at the following angle θ. For example, if the trunk main body region 5d above the upper end P2 of the lower end 5e of the trunk 5 is formed into a cylindrical shape with a constant diameter in the vertical direction, the upper end of the lower end 5e of the inner trunk 5b has the maximum diameter. If the angle θ exceeds 20°, the above-mentioned frictional resistance during separation is likely to occur at that portion. Further, when the trunk body region 5d above the upper end P2 of the lower end portion 5e of the trunk portion 5 is configured in the shape of an inclined surface having the same inclination angle as the lower end portion 5e of the trunk portion 5, the upper end of the trunk body region 5d The side portions will be large and unstable, and the appearance and operability (ease of holding, etc.) will be poor.

また、上記効果を得易くするためには、胴部５の下端部５ｅの上端Ｐ２での半径と胴部５の下端部５ｅの下端Ｐ１での半径との差ΔＲが、１．０～３．０ｍｍであるのが好ましい。 In addition, in order to easily obtain the above effect, the difference ΔR between the radius at the upper end P2 of the lower end portion 5e of the trunk portion 5 and the radius at the lower end P1 of the lower end portion 5e of the trunk portion 5 is set to 1.0 to 3. Preferably, it is .0 mm.

また、上記効果を得易くするためには、胴部５の下端部５ｅは、縦断面において、図示するような直線状でもよいし、図示しない曲線状でもよいが、上方に向けて径が漸次増加するのが好ましい。胴部５の下端部５ｅを、縦断面において曲線状をなすように構成する場合には、容器外側に凸となる曲線状とするのが好ましい。なお、胴部５の下端部５ｅを、縦断面においてヒール部６と一続きとなる曲線状をなすように構成してもよい。つまり、胴部５の下端部５ｅの曲率がヒール部６の曲率と同じとなるように構成してもよいし、胴部５の下端部５ｅの曲率がヒール部６から離れるにつれてヒール部６の曲率から滑らかに変化する構成としてもよい。 Further, in order to easily obtain the above effect, the lower end portion 5e of the body portion 5 may have a straight line shape as shown in the longitudinal section or a curved shape not shown, but the diameter gradually increases toward the top. Preferably, it increases. When the lower end portion 5e of the body portion 5 is configured to have a curved shape in the longitudinal section, it is preferable that the lower end portion 5e has a curved shape that is convex toward the outside of the container. Note that the lower end portion 5e of the trunk portion 5 may be configured to have a curved shape that is continuous with the heel portion 6 in the longitudinal section. In other words, the curvature of the lower end 5e of the trunk 5 may be the same as the curvature of the heel 6, or as the curvature of the lower end 5e of the trunk 5 moves away from the heel 6, the curvature of the heel 6 increases. It may be configured such that the curvature changes smoothly.

胴部５の下端部５ｅの上端Ｐ２よりも上側の胴本体領域５ｄは、上下方向に径が一定の円筒状に限らず例えば、図４に示す変形例のように、胴部５の下端部５ｅと同じ傾斜角度の傾斜面状に構成してもよい。このような場合でも上記効果を得ることができる。また、胴部５の下端部５ｅの上端Ｐ２よりも上側の胴本体領域５ｄは、例えば、胴部５の下端部５ｅから傾斜角度が段階的に小さくなるなど、胴部５の下端部５ｅから傾斜角度が変化する構成としてもよい。 The trunk main body region 5d above the upper end P2 of the lower end portion 5e of the trunk portion 5 is not limited to a cylindrical shape having a constant diameter in the vertical direction. It may be constructed in the form of an inclined surface having the same inclination angle as 5e. Even in such a case, the above effects can be obtained. Further, the trunk body region 5d above the upper end P2 of the lower end portion 5e of the trunk portion 5 has an inclination angle that gradually decreases from the lower end portion 5e of the trunk portion 5, for example. A configuration in which the inclination angle changes may also be used.

本発明は前述した実施形態に限定されず、その要旨を逸脱しない範囲で種々変更可能である。 The present invention is not limited to the embodiments described above, and can be modified in various ways without departing from the gist thereof.

したがって、前述した実施形態の二重容器１は、口部４、口部４よりも拡径する胴部５、ヒール部６及び底部７をこの順に有し、外層体２ａと外層体２ａの内側に剥離可能に積層される内層体２ｂとによって形成され、内層体２ｂが、口部４において外層体２ａの内周面に螺脱可能に螺合する螺合部４ｅを有し、少なくとも胴部５の下端部５ｅが、ヒール部６の上端から上方に向けて徐々に拡径する、二重容器１である限り変更可能である。 Therefore, the double container 1 of the embodiment described above has the mouth 4, the trunk 5 whose diameter is larger than the mouth 4, the heel 6, and the bottom 7 in this order, and the outer layer 2a and the inner side of the outer layer 2a. The inner layer body 2b has a threaded portion 4e that is removably screwed onto the inner circumferential surface of the outer layer body 2a at the mouth portion 4, and at least the body portion As long as it is a double container 1 in which the lower end portion 5e of the container 5 gradually increases in diameter upward from the upper end of the heel portion 6, it can be modified.

前述した実施形態では、容器本体２は、分別時まで外層体２ａと内層体２ｂの密着状態が維持される構成とされるが、これに限らず例えば、外気導入口を有するとともに内容物の吐出による内層体２ｂの減容変形に伴って外気導入口から外層体２ａと内層体２ｂの間に外気を導入可能な積層剥離容器として構成してもよい。その場合、外気導入口は、外口部４ａを径方向に貫通する１つ以上の貫通穴によって構成してもよいし、内口部４ｂの上端面と外口部４ａとの間に形成される隙間によって構成してもよい。 In the embodiment described above, the container body 2 is configured such that the outer layer body 2a and the inner layer body 2b are kept in close contact with each other until the time of sorting. It may be configured as a laminated peelable container in which outside air can be introduced between the outer layer body 2a and the inner layer body 2b from the outside air inlet as the inner layer body 2b is deformed to reduce its volume. In that case, the outside air inlet may be formed by one or more through holes passing through the outer opening 4a in the radial direction, or may be formed between the upper end surface of the inner opening 4b and the outer opening 4a. It may also be configured by a gap between

なお、前述した実施形態の二重容器１は、上記構成において、胴部５の下端部５ｅが、ヒール部６の上端から胴部５の全高に対する１５％の高さの部分までにわたる部分として定義され、二重容器１の中心軸線Ｏを含む縦断面において、胴部５の下端部５ｅにおける下端Ｐ１と上端Ｐ２を結ぶ直線が中心軸線Ｏに対して２０°以下の角度θで傾く、二重容器１であるのが好ましい。 In addition, in the double container 1 of the embodiment described above, in the above structure, the lower end 5e of the trunk 5 is defined as a portion extending from the upper end of the heel 6 to a height of 15% of the total height of the trunk 5. In the longitudinal section including the central axis O of the double container 1, the straight line connecting the lower end P1 and the upper end P2 at the lower end 5e of the body 5 is inclined at an angle θ of 20° or less with respect to the central axis O. Container 1 is preferred.

１ 二重容器
２ 容器本体
２ａ 外層体
２ｂ 内層体
３ キャップ
４ 口部
４ａ 外口部
４ｂ 内口部
４ｃ ネックリング
４ｄ 被螺合部
４ｅ 螺合部
４ｆ 段差部
４ｇ フランジ
５ 胴部
５ａ 外胴部
５ｂ 内胴部
５ｃ 肩領域
５ｄ 胴本体領域
５ｅ 下端部
６ ヒール部
６ａ 外ヒール部
６ｂ 内ヒール部
７ 底部
７ａ 外底部
７ｂ 内底部
７ｃ 接地部
７ｄ 底凹部
ｈ 胴部の下端部の上端の高さ
Ｈ 胴部の上端の高さ
Ｏ 中心軸線
Ｐ１ 胴部の下端部の下端
Ｐ２ 胴部の下端部の上端
Ｓ 収容空間
θ 角度
ΔＲ 半径差 1 Double container 2 Container body 2a Outer layer 2b Inner layer 3 Cap 4 Mouth 4a Outer opening 4b Inner opening 4c Neck ring 4d Screwed part 4e Screwed part 4f Step part 4g Flange 5 Body 5a Outer body 5b Inner trunk 5c Shoulder region 5d Trunk body region 5e Lower end 6 Heel 6a Outer heel 6b Inner heel 7 Bottom 7a Outer bottom 7b Inner bottom 7c Ground contact 7d Bottom recess h Height of upper end of lower end of trunk H Height of the upper end of the trunk O Central axis P1 Lower end of the lower end of the trunk P2 Upper end of the lower end of the trunk S Accommodation space θ Angle ΔR Radius difference

Claims (2)

口部、口部よりも拡径する胴部、ヒール部及び底部をこの順に有し、
外層体と前記外層体の内側に剥離可能に積層される内層体とによって形成され、
前記内層体が、前記口部において前記外層体の内周面に螺脱可能に螺合する螺合部を有し、
少なくとも前記胴部の下端部が、前記ヒール部の上端から上方に向けて徐々に拡径する、二重容器。 It has a mouth part, a body part whose diameter is larger than the mouth part, a heel part, and a bottom part in this order,
formed by an outer layer body and an inner layer body removably laminated inside the outer layer body,
The inner layer body has a threaded portion that is removably threaded onto the inner circumferential surface of the outer layer body at the mouth portion,
A double container, wherein at least a lower end portion of the body portion gradually increases in diameter upward from an upper end of the heel portion. 前記胴部の前記下端部が、前記ヒール部の上端から胴部の全高に対する１５％の高さの部分までにわたる部分として定義され、
前記二重容器の中心軸線を含む縦断面において、前記胴部の前記下端部における下端と上端を結ぶ直線が前記中心軸線に対して２０°以下の角度で傾く、請求項１に記載の二重容器。 The lower end of the torso is defined as a portion extending from the upper end of the heel to a height of 15% of the total height of the torso,
2. The double container according to claim 1, wherein in a longitudinal section including the central axis of the double container, a straight line connecting the lower end and the upper end of the lower end of the body is inclined at an angle of 20 degrees or less with respect to the central axis. container.