JP2008068898A - Plastic bottle - Google Patents

Plastic bottle Download PDF

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JP2008068898A
JP2008068898A JP2006248960A JP2006248960A JP2008068898A JP 2008068898 A JP2008068898 A JP 2008068898A JP 2006248960 A JP2006248960 A JP 2006248960A JP 2006248960 A JP2006248960 A JP 2006248960A JP 2008068898 A JP2008068898 A JP 2008068898A
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outer edge
edge line
plastic bottle
inner edge
movable
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JP4858698B2 (en
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Hidehiko Katsuta
秀彦 勝田
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Toyo Seikan Group Holdings Ltd
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Toyo Seikan Kaisha Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a plastic bottle which satisfactorily retains a self-standing state with a movable section pushed out, and also minimizes such a state that the movable section cannot be easily pushed out and pushed back. <P>SOLUTION: The plastic bottle has: in its bottom 15 the movable section 20 that is pushed out and pushed back. The movable section 20 includes an annular inclined part 21 extending from the outer edge 15a of the bottom 15 at an angle; and a fixed part 22 surrounded by the inclined part 21. The outer edge parts 211 of the inclined part 21 are line segments connecting the points 25a to 25h of a regular polygon, thereby allowing bending in the direction of pushing out and in the direction of pushing back. The inner edge parts 212 of the inclined part 21 are substantially parallel to the outer edge parts 211, thereby allowing bending in the direction of pushing out and in the direction of pushing back. The inclined part 21 has V-shaped grooves 27a to 27h connecting the points 25a to 25h of the outer edges 211 and corresponding points 26a to 26h of the inner edge parts 212. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、ペットボトル等のプラスチックボトルに係り、詳しくは、底部に形成された可動部の押出し及び押入れによる高さ方向の伸縮によって内容積を変化させることのできるプラスチックボトルに関する。   The present invention relates to a plastic bottle such as a plastic bottle, and more particularly to a plastic bottle whose internal volume can be changed by expansion and contraction in the height direction by pushing out and pushing a movable part formed at the bottom.

従来、底部に形成された可動部の押出し及び押入れによる高さ方向の伸縮によって内容積を変化させることのできるプラスチックボトル（例えば、ペットボトル）が知られている（例えば、特許文献１参照）。このプラスチックボトルは、底部の可動部を押出した状態で茶飲料等の高温の液体飲料を充填（高温充填）してキャップを巻き締めた後にその液体飲料が冷める過程でその体積が減少することに伴って内圧が低減することを、前記可動部を押入れて内容積を減少させることによって吸収（防止）するものである。
特開２００６−５０１１０９号公報 2. Description of the Related Art Conventionally, a plastic bottle (for example, a plastic bottle) capable of changing an inner volume by expansion and contraction in a height direction by pushing and pushing a movable portion formed on a bottom is known (see, for example, Patent Document 1). The volume of the plastic bottle is reduced in the process of cooling the liquid drink after filling the hot drink such as tea drink (high temperature filling) with the movable part at the bottom pushed out and tightening the cap. Along with this, the decrease in internal pressure is absorbed (prevented) by pushing in the movable part and reducing the internal volume.
JP 2006-501109 A

ところで、このようなプラスチックボトルは、内溶液を充填する際等の個々的な搬送を考慮すると、可動部が押出された状態で安定的に自立可能であることが好ましい。このように底部の可動部が押出された状態でプラスチックボトルの自立性を良好にするには、押出された状態の可動部の接地すべき部分の外縁の径をできるだけ大きくする必要がある。しかし、可動部の接地すべき部分の外縁の径を大きくすると、プラスチックボトルの底部に対する可動部の傾斜がきつくなって可動部の押出し及び押入れがし難くなってしまう。   By the way, it is preferable that such a plastic bottle can stably stand by in a state in which the movable part is pushed out in consideration of individual conveyance when filling the inner solution. Thus, in order to improve the self-supporting property of the plastic bottle in the state where the movable part at the bottom is pushed out, it is necessary to make the diameter of the outer edge of the portion to be grounded of the movable part in the pushed state as large as possible. However, if the diameter of the outer edge of the portion to be grounded of the movable part is increased, the inclination of the movable part with respect to the bottom part of the plastic bottle becomes tight, and it becomes difficult to push and push the movable part.

本発明は、このような事情に鑑みてなされたもので、可動部が押出された状態で自立性を良好に維持しつつ当該可動部の押出し及び押入れがし難くなることを極力防止することのできるプラスチックボトルを提供するものである。   The present invention has been made in view of such circumstances, and it is possible to prevent as much as possible that the movable part is difficult to be pushed out and pushed in while maintaining the self-supporting property in a state where the movable part is pushed out. A plastic bottle is provided.

本発明に係るプラスチックボトルは、胴部に続いて形成される底部に押出し及び押入れ可能となる可動部の形成されたプラスチックボトルであって、前記可動部は、前記底部の外縁部から傾斜して延びる環状の傾斜部と、該傾斜部に囲まれる定常部とを有し、前記底部の前記外縁部との境界となる前記傾斜部の外縁線部が、正多角形の各頂点を結んだ線状となって、前記押出し及び押入れの各方向に屈曲可能となり、前記定常部との境界となる前記傾斜部の内縁線部が、前記外縁線部と実質的に平行となって、前記押出し及び押入れの各方向に屈曲可能となり、前記傾斜部には、前記外縁線部の各頂点と前記内縁線部の対応する頂点とを結ぶＶ字状溝が形成されている構成となる。   The plastic bottle according to the present invention is a plastic bottle formed with a movable part that can be pushed out and pushed into a bottom part formed following the trunk part, and the movable part is inclined from an outer edge part of the bottom part. A line that has an annular inclined portion that extends and a stationary portion that is surrounded by the inclined portion, and an outer edge line portion of the inclined portion that is a boundary with the outer edge portion of the bottom portion connects each vertex of a regular polygon The inner edge line portion of the inclined portion that becomes a boundary with the stationary portion is substantially parallel to the outer edge line portion, and can be bent in each direction of the extrusion and the close-in. It can be bent in each direction of the closet, and the inclined portion has a V-shaped groove that connects each vertex of the outer edge line portion and a corresponding vertex of the inner edge line portion.

このような構成により、底部に形成された可動部の傾斜部の外縁線部と内縁線部とがそれぞれ互いに相似である正多角形の各頂点を結ぶ線状となって、押出し押入れの各方向に屈曲可能となり、前記外縁線部の各頂点と前記内縁線部の対応する頂点との間にＶ字状溝が形成されているので、傾斜部の外縁線部及び内縁線部の各頂点及びＶ字状溝によって当該傾斜部の面内で変形する箇所が明確になり、前記傾斜部の外縁線部及び内縁線部にて屈曲して可動部が押出し及び押入れられる際に、該傾斜部が容易に反転動作できるようになる。   With such a configuration, the outer edge line part and the inner edge line part of the inclined part of the movable part formed on the bottom form a line connecting the vertices of a regular polygon that are similar to each other, and each direction of extrusion close-in Since the V-shaped groove is formed between each vertex of the outer edge line portion and a corresponding vertex of the inner edge line portion, each vertex of the outer edge line portion and the inner edge line portion of the inclined portion and The V-shaped groove makes it clear where the inclined portion is deformed in the plane of the inclined portion, and when the movable portion is pushed out and pushed in by bending at the outer edge line portion and the inner edge line portion of the inclined portion, the inclined portion Inverting operation can be easily performed.

また、正多角形の各頂点部に応力が集まり易くなり、折り曲げのきっかけとなって該傾斜部が容易に反転動作できるようになる。   Further, stress is easily collected at each vertex of the regular polygon, and the inclined portion can be easily reversed by being a cause of bending.

また、本発明に係るプラスチックボトルにおいて、前記胴部から前記底部の外縁部にかけて前記傾斜部の前記外縁線部の各頂点間の辺に向けたカット面が形成された構成とすることができる。   Moreover, the plastic bottle which concerns on this invention WHEREIN: It can be set as the structure by which the cut surface toward the edge | side between each vertex of the said outer edge line part of the said inclination part was formed from the said trunk | drum to the outer edge part of the said bottom part.

このような構成により、カット面により底部における外縁部の張出しが減るので、前記底部の外縁部との境界となる傾斜部の外縁線部での屈曲をし易くさせることができる。   With such a configuration, the protrusion of the outer edge portion at the bottom portion is reduced by the cut surface, and therefore it is possible to easily bend the outer edge line portion of the inclined portion that becomes the boundary with the outer edge portion of the bottom portion.

また、本発明に係るプラスチックボトルにおいて、前記定常部は、前記傾斜部の内縁線部から延びる平坦部と、該平坦部から続く凹部とを有する構成とすることができる。   Moreover, the plastic bottle which concerns on this invention WHEREIN: The said stationary part can be set as the structure which has the flat part extended from the inner edge line part of the said inclination part, and the recessed part continued from this flat part.

このような構成により、底部の可動部が押出された状態で、傾斜部の内縁線部から延びる平坦部によって当該プラスチックボトルの自立性を確実に維持することができる。また、その平坦部から続く凹部に棒状の器具を刺して押すことにより傾斜部を反転させて可動部を押入れることができる。   With such a configuration, the self-supporting property of the plastic bottle can be reliably maintained by the flat portion extending from the inner edge line portion of the inclined portion in a state where the movable portion at the bottom is pushed out. Further, the movable portion can be pushed in by inverting the inclined portion by inserting and pushing a rod-like instrument into the concave portion continuing from the flat portion.

更に、本発明に係るプラスチックボトルにおいて、前記平坦部と前記凹部との境界線部は、前記傾斜部の前記内縁線部と実質的に平行となる構成とすることができる。   Furthermore, the plastic bottle which concerns on this invention WHEREIN: The boundary line part of the said flat part and the said recessed part can be set as the structure which becomes substantially parallel with the said inner edge line part of the said inclination part.

このような構成により、傾斜部の外縁線部及び内縁線部に加えて更に平坦部とそれに続く凹部との境界線部が正多角形の各頂点を結んだ線状となるので、当該プラスチックボトルの底部を統一的な形状にて一体的に形成することができる。   With such a configuration, in addition to the outer edge line portion and the inner edge line portion of the inclined portion, the boundary line portion between the flat portion and the subsequent concave portion becomes a linear shape connecting each vertex of the regular polygon. Can be formed integrally with a uniform shape.

本発明に係るプラスチックボトルによれば、傾斜部の外縁線部及び内縁線部の各頂点及びＶ字状溝によって当該傾斜部の面内で変形する箇所が明確になって、前記傾斜部の外縁線部及び内縁線部にて屈曲して可動部が押出し及び押入れされる際に、該傾斜部が容易に反転動作できるようになるので、傾斜部の外縁線部とともにその内縁線部の径を大きくして可動部が押出された状態での自立性を良好に維持するようにしても、可動部の押出し及び押入れがし難くなることを極力防止することができる。   According to the plastic bottle of the present invention, the outer edge line portion of the inclined portion, the respective vertexes of the inner edge line portion, and the V-shaped groove make it clear where to deform in the plane of the inclined portion, and the outer edge of the inclined portion. When the movable part is pushed out and pushed in by bending at the line part and the inner edge line part, the inclined part can be easily reversed, so the diameter of the inner edge line part together with the outer edge line part of the inclined part is reduced. Even if it is made large and the self-supporting property in a state where the movable part is pushed out is maintained well, it is possible to prevent the pushing-out and pushing-in of the movable part from becoming difficult as much as possible.

以下、本発明の実施の形態について、図面を用いて説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

本発明の実施の一形態に係るプラスチックボトルは、図１乃至図４に示すように構成される。なお、図１は、底部に形成された可動部が押出された状態となるプラスチックボトルの一部切欠側面図であり、図２は、底部の可動部が押入られた状態となるプラスチックボトルの一部切欠側面図であり、図３はプラスチックボトルの底面側から見た平面図であり、図４は、プラスチックボトルの底面側から見た斜視図である。   A plastic bottle according to an embodiment of the present invention is configured as shown in FIGS. FIG. 1 is a partially cutaway side view of a plastic bottle in which the movable part formed at the bottom is pushed out, and FIG. 2 is one of the plastic bottles in which the movable part at the bottom is pushed in. FIG. 3 is a side view of a part cutaway, FIG. 3 is a plan view seen from the bottom side of the plastic bottle, and FIG. 4 is a perspective view seen from the bottom side of the plastic bottle.

図１乃至図４において、このプラスチックボトル１０は、例えば、ＰＥＴの２軸延伸ブロー成形によって形成され、口部１１から順次径が拡がって肩部１２、胴部１３を経て底部１５につながる構造となっている（図１、図２参照）。底部１５にはプラスチックボトル１０の縦軸方向（図１及び図２における上下方向）において押出し及び押入れ可能となる可動部２０が形成されている。可動部２０は、底部１５の外縁部１５ａから傾斜して延びる環状の傾斜部２１と傾斜部２１に囲まれる定常部２２とを有している。底部１５の外縁部１５ａとの境界となる傾斜部２１の外縁線部２１１は、プラスチックボトル１０の縦軸方向に屈曲可能となっており、定常部２２との境界となる傾斜部２１の内縁線部２１２もまたプラスチックボトル１０の縦軸方向に屈曲可能となっている。このように傾斜部２１の外縁線部２１１及び内縁線部２１２のそれぞれが屈曲可能となることにより、傾斜部２１がプラスチックボトル１０の縦軸方向において反転動作（図１に示す状態と図２に示す状態との間での反転）可能となり、この傾斜部２１の反転動作により可動部２０が縦軸方向において押出し及び押し入れられるようになる。   1 to 4, the plastic bottle 10 is formed by, for example, PET biaxial stretch blow molding, and has a structure in which the diameter gradually increases from the mouth portion 11 to the bottom portion 15 through the shoulder portion 12 and the trunk portion 13. (See FIGS. 1 and 2). A movable portion 20 that can be pushed out and pushed in the vertical direction of the plastic bottle 10 (the vertical direction in FIGS. 1 and 2) is formed on the bottom portion 15. The movable portion 20 includes an annular inclined portion 21 that extends from the outer edge portion 15 a of the bottom portion 15 and an stationary portion 22 that is surrounded by the inclined portion 21. An outer edge line portion 211 of the inclined portion 21 that becomes a boundary with the outer edge portion 15 a of the bottom portion 15 can be bent in the longitudinal direction of the plastic bottle 10, and an inner edge line of the inclined portion 21 that becomes a boundary with the stationary portion 22. The part 212 is also bendable in the longitudinal direction of the plastic bottle 10. In this way, the outer edge line portion 211 and the inner edge line portion 212 of the inclined portion 21 can be bent, so that the inclined portion 21 is reversed in the vertical direction of the plastic bottle 10 (the state shown in FIG. 1 and FIG. 2). The reversing operation of the inclined portion 21 allows the movable portion 20 to be pushed out and pushed in the vertical axis direction.

定常部２２は、傾斜部２１の内縁線部２１２から延び、プラスチックボトル１０の縦軸に実質的に直行する面をとなる平坦部２２（１）と平坦部２２（１）から続く凹部２２（２）とを有している。この定常部２２は、傾斜部２１の前述した反転動作に際してその形状を変えることなく維持するようになっている。   The stationary part 22 extends from the inner edge line part 212 of the inclined part 21 and has a flat part 22 (1) that is substantially perpendicular to the longitudinal axis of the plastic bottle 10 and a concave part 22 (continuous from the flat part 22 (1). 2). The stationary portion 22 is maintained without changing its shape during the aforementioned reversing operation of the inclined portion 21.

特に図３及び図４を参照するに、傾斜部２１の外縁線部２１１は、正八角形の各頂点２５ａ、２５ｂ、２５ｃ、２５ｄ、２５ｅ、２５ｆ、２５ｇ、２５ｈを結んだ線状となる。各頂点を結ぶ線は、僅かに径方向外方に膨らんだ形状となっている。なお、外縁線部２１１の形状を決める各頂点２５ａ〜２５ｈを結ぶ線は、直線であっても湾曲した線であっても、その頂点が明確に表れるものであればどちらでもよい。傾斜部２１の内縁線部２１２は、外縁線部２１１と実施的に平行となる。即ち、内縁線部２１２もまた正八角形の各頂点２６ａ、２６ｂ、２６ｃ、２６ｄ、２６ｅ、２６ｆ、２６ｇ、２６ｈを結んだ線状となっている。また、傾斜部２１には、外縁線部２１１の各頂点２５ａ〜２５ｈ（正八角形の各頂点）と内縁線部２１２の対応する頂点２６ａ〜２６ｈ（正八角形の各頂点）とを結ぶＶ字状溝２７ａ、２７ｂ、２７ｃ、２７ｄ、２７ｅ、２７ｆ、２７ｇ、２７ｈが形成されている。各Ｖ字状溝２７ａ〜２７ｈのＶ字角度が変化することによって傾斜部２１がその面内において変形することができるようになっている。   3 and 4, the outer edge line portion 211 of the inclined portion 21 has a linear shape connecting the regular vertices 25a, 25b, 25c, 25d, 25e, 25f, 25g, and 25h. The line connecting the vertices has a shape slightly bulging radially outward. The line connecting the vertices 25a to 25h that determines the shape of the outer edge line portion 211 may be either a straight line or a curved line as long as the vertex clearly appears. The inner edge line portion 212 of the inclined portion 21 is practically parallel to the outer edge line portion 211. That is, the inner edge line portion 212 is also in a linear shape connecting the regular vertices 26a, 26b, 26c, 26d, 26e, 26f, 26g, and 26h. In addition, the inclined portion 21 has a V-shape that connects the vertices 25a to 25h (regular octagon vertices) of the outer edge line portion 211 and the corresponding vertices 26a to 26h (regular octagon vertices) of the inner edge line portion 212. Grooves 27a, 27b, 27c, 27d, 27e, 27f, 27g, and 27h are formed. By changing the V-shaped angle of each of the V-shaped grooves 27a to 27h, the inclined portion 21 can be deformed in the plane.

更に、定常部２２において、平坦部２２（１）と凹部２２（２）との境界線部２２１は、傾斜部２１の内縁線部２１２と実施的に平行となり、正八角形の各頂点を結ぶ線状となっている。そして、凹部２２（２）内には、その正八角形の各頂点から当該凹部２２（２）の底に向けて延びるようにＶ字状溝が形成されている。このＶ字状溝によって凹部２２（２）が補強されている。   Further, in the stationary part 22, the boundary line part 221 between the flat part 22 (1) and the concave part 22 (2) is practically parallel to the inner edge line part 212 of the inclined part 21, and is a line connecting each vertex of the regular octagon. It has become a shape. A V-shaped groove is formed in the recess 22 (2) so as to extend from each apex of the regular octagon toward the bottom of the recess 22 (2). The recess 22 (2) is reinforced by the V-shaped groove.

更に、プラスチックボトル１０の胴部１３から底部１５の外縁部１５ａにかけて傾斜部２１の外縁線部２１１の各頂点２５ａ〜２５ｈ間の辺に向けてカット面１６ａ、１６ｂ、１６ｃ、１６ｄ、１６ｅ、１６ｆ、１６ｇ、１６ｈが形成されている。各カット面１６ａ〜１６ｈは、胴部１３の下方部から底部１５の外縁部１５ａを経て傾斜部２１の外縁線部２１１に至る平面となっている。   Further, the cut surfaces 16a, 16b, 16c, 16d, 16e, and 16f from the body portion 13 of the plastic bottle 10 to the outer edge portion 15a of the bottom portion 15 toward the sides between the vertexes 25a to 25h of the outer edge line portion 211 of the inclined portion 21. 16g and 16h are formed. Each of the cut surfaces 16 a to 16 h is a plane that extends from the lower portion of the body portion 13 to the outer edge line portion 211 of the inclined portion 21 through the outer edge portion 15 a of the bottom portion 15.

前述したようなプラスチックボトル１０は、初期状態において、図１及び図４に示すように、傾斜部２１が底部１５の外縁部１５ａより突出して可動部２０が押出された状態となっている。この状態で、プラスチックボトル１０は、定常部２２の平坦部２２（１）が接地して自立する。この自立したプラスチックボトル２０に対して、例えば、高温の茶飲料等の内溶液が充填される。そして、プラスチックボトル２０の口部１１に蓋を巻締めた後に、内溶液の冷却に伴う減容を補償するために、例えば、凹部２２（２）に挿入したロッド棒を押し込むことにより、傾斜部２１が図２に示すように反転して、可動部２０が押入られた状態となる。これにより、プラスチックボトル１０は、減容されてその形状を維持するとともに、底部１５の外縁部１５ａが接地して自立した状態が維持される。   In the initial state, the plastic bottle 10 as described above is in a state where the inclined portion 21 protrudes from the outer edge portion 15a of the bottom portion 15 and the movable portion 20 is pushed out, as shown in FIGS. In this state, the plastic bottle 10 is self-supporting with the flat portion 22 (1) of the stationary portion 22 being grounded. The self-supporting plastic bottle 20 is filled with an internal solution such as a hot tea drink. Then, after the lid is wrapped around the mouth portion 11 of the plastic bottle 20, in order to compensate for the volume reduction accompanying cooling of the inner solution, for example, by pushing the rod rod inserted into the recess 22 (2), the inclined portion 21 reverses as shown in FIG. 2, and the movable part 20 is pushed in. Thereby, the plastic bottle 10 is reduced in volume and maintains its shape, and the outer edge portion 15a of the bottom portion 15 is grounded and maintained in a self-supporting state.

傾斜部２１の反転動作においては、傾斜した傾斜部２１がその外縁線部２１１及び内縁線部２１２が屈曲しつつプラスチックボトル１０の内方に押し込まれる際に、傾斜部２１の大きさが底部１５の外縁部１５ａによって拘束されることから、各Ｖ字状溝２７ａ〜２７ｈが折り畳まれるように変形して傾斜部２１がその面内で縮むように変形する。そして、傾斜部２１は、その外縁線部２１１及び内縁線部２１２が屈曲しつつ底部１５の外縁部１５ａから更に内方に押し込まれると、底部１５の外縁部１５ａによる拘束から開放され、折り畳まれていた各Ｖ字状溝２７ａ〜２７ｂが一気に元の状態に拡がって、プラスチックボトル１０の内方に反転する。これにより、可動部２０が押し入れられた状態となる。   In the reversing operation of the inclined portion 21, when the inclined inclined portion 21 is pushed into the plastic bottle 10 while the outer edge line portion 211 and the inner edge line portion 212 are bent, the size of the inclined portion 21 is the bottom 15. Therefore, the V-shaped grooves 27a to 27h are deformed so as to be folded and the inclined portion 21 is deformed so as to be contracted in the plane. Then, when the outer edge line portion 211 and the inner edge line portion 212 are bent and pushed further inwardly from the outer edge portion 15a of the bottom portion 15, the inclined portion 21 is released from being restrained by the outer edge portion 15a of the bottom portion 15 and folded. The V-shaped grooves 27 a to 27 b that have been spread expand to the original state at once, and are inverted to the inside of the plastic bottle 10. Thereby, it will be in the state where movable part 20 was pushed in.

傾斜部２１の内縁線部２１２をプラスチックボトル１０の径方向のより外方に位置するようにすることにより、平坦部２２（１）の接地径が大きくなって自立性がより良好となる。しかし、傾斜部２１の内縁線部２１２を径方向のより外方に位置するようにすると、内縁線部２２１の径方向位置と外縁線部２１１の径方向位置とが近づくことから、傾斜部２１の傾斜角度が大きくなる。このように傾斜部２１の傾斜角度が大きくなると、傾斜部２１を反転させるための角度（図２の実線及び破線で示す可動部２０参照）が大きくなってその反転動作がし難くなる。即ち、可動部２０の押出し及び押入れがし難くなる。   By positioning the inner edge line portion 212 of the inclined portion 21 more outward in the radial direction of the plastic bottle 10, the ground contact diameter of the flat portion 22 (1) becomes larger and the self-supporting property becomes better. However, if the inner edge line portion 212 of the inclined portion 21 is positioned more outward in the radial direction, the radial position of the inner edge line portion 221 and the radial direction position of the outer edge line portion 211 approach each other. The inclination angle becomes larger. Thus, when the inclination angle of the inclined portion 21 is increased, an angle for reversing the inclined portion 21 (see the movable portion 20 indicated by a solid line and a broken line in FIG. 2) is increased and it is difficult to perform the reversing operation. That is, it becomes difficult to push out and close the movable portion 20.

前述したプラスチックボトル１０では、可動部２０の傾斜部２１の外縁線部２１１と内縁線部２１２とがそれぞれ正八角形の各頂点２５ａ〜２５ｈ、２６ａ〜２６ｈを結ぶ線状となって、押出し押入れの各方向に屈曲可能となり、外縁線部２１１の各頂点２５ａ〜２５ｈと内縁線部２１２の対応する頂点２６ａ〜２６ｈとの間にＶ字状溝２７ａ〜２７ｈが形成されているので、傾斜部２１の外縁線部２１１及び内縁線部２１２の各頂点２５ａ〜２５ｈ、２６ａ〜２６ｈ及びＶ字状溝２７ａ〜２７ｈによって傾斜部２１の面内で変形する箇所が明確になり、傾斜部２１の外縁線部２１１及び内縁線部２１２にて屈曲して可動部２０が押出され及び押し入れられる際に、傾斜部２１が容易に反転動作できるようになる。従って、傾斜部２１の内縁部２１２をプラスチックボトル１０の径方向のより外方に位置させて自立性をより良好にした場合であっても、可動部２０の押出し及び押入れがし難くなることを防止することができる。   In the plastic bottle 10 described above, the outer edge line portion 211 and the inner edge line portion 212 of the inclined portion 21 of the movable portion 20 are linearly connected to the respective apexes 25a to 25h and 26a to 26h of the regular octagon, Since the V-shaped grooves 27a to 27h are formed between the vertices 25a to 25h of the outer edge line portion 211 and the corresponding vertices 26a to 26h of the inner edge line portion 212, the inclined portion 21 can be bent. The outer edge line portion 211 and the inner edge line portion 212 have their vertices 25a to 25h, 26a to 26h, and V-shaped grooves 27a to 27h to clarify the locations of deformation in the plane of the inclined portion 21, and the outer edge line of the inclined portion 21. When the movable portion 20 is pushed out and pushed in by bending at the portion 211 and the inner edge line portion 212, the inclined portion 21 can be easily reversed. Therefore, even when the inner edge portion 212 of the inclined portion 21 is positioned more outward in the radial direction of the plastic bottle 10 to improve the self-supporting property, it is difficult to push out and push in the movable portion 20. Can be prevented.

また、プラスチックボトル１０の胴部１３から底部１５の外縁部１５ａにかけて傾斜部２１の外縁線部２１１の各頂点２５ａ〜２５ｈ間の辺に向けてカット面１６ａ、１６ｂ、１６ｃ、１６ｄ、１６ｅ、１６ｆ、１６ｇ、１６ｈが形成されている。これら各カット面１６ａ〜１６ｈにより底部１５における外縁部１５ａの張出しが減るので、前記底部１５の外縁部１５ａとの境界となる傾斜部２１の外縁線部２１１での屈曲をし易くさせることができる。   Further, the cut surfaces 16a, 16b, 16c, 16d, 16e, and 16f are directed from the body portion 13 of the plastic bottle 10 to the outer edge portion 15a of the bottom portion 15 toward the sides between the vertexes 25a to 25h of the outer edge line portion 211 of the inclined portion 21. 16g and 16h are formed. Since each of the cut surfaces 16a to 16h reduces the overhang of the outer edge portion 15a in the bottom portion 15, it is possible to facilitate bending at the outer edge line portion 211 of the inclined portion 21 that is a boundary with the outer edge portion 15a of the bottom portion 15. .

なお、前述した例では、傾斜部２１の外縁線部２１１及び内縁線部２１２は、正八角形の各頂点２５ａ〜２５ｈ、２６ａ〜２６ｈを結んだ線状となっているが、他の正多角形の各頂点を結んだ線状とすることも可能である。また、定常部２２における平坦部２２（１）と凹部２２（２）との間の境界線部２２１は、正八角形の各頂点を結んだ線状となっているが、定常部２２自体は、可動部２０の押出し押入れに際して変形しないので、この境界線部２２１の形状は任意の形状とすることができる。   In the above-described example, the outer edge line portion 211 and the inner edge line portion 212 of the inclined portion 21 have a linear shape connecting the vertices 25a to 25h and 26a to 26h of the regular octagon, but other regular polygons. It is also possible to form a line connecting the vertices. Moreover, although the boundary line part 221 between the flat part 22 (1) and the recessed part 22 (2) in the stationary part 22 has a linear shape connecting the vertices of a regular octagon, Since the movable portion 20 is not deformed during the push-in and push-in operation, the shape of the boundary line portion 221 can be an arbitrary shape.

また、なお、プラスチックボトル１０は、可動部２０が押出された形態（図１参照）のものを初めからブロー成形によって形成して使い始めてもよいし、可動部２０が押戻された形態（図２参照）のものをブロー成形によって予め形成しておき、プラスチックボトル１０内方への流体による加圧、または、ブラスチックボトル１０内方からロッド棒で可動部２０を押出した状態にして使い始めてもよい。   In addition, the plastic bottle 10 may be formed by blow molding from the beginning in which the movable portion 20 is extruded (see FIG. 1), or may be used after the movable portion 20 is pushed back (see FIG. 1). 2) is preliminarily formed by blow molding, and the plastic bottle 10 is pressurized with a fluid inside, or the movable part 20 is pushed out from the inside of the plastic bottle 10 with a rod rod, and then used. Also good.

以上、説明したように、本発明に係るプラスチックボトルは、可動部が押出された状態で自立性を良好に維持しつつ当該可動部の押出し及び押出しがし難くなることを極力防止することができるという効果を有し、底部に形成された可動部の押出し及び押戻しによる高さ方向の伸縮によって内容積を変化させることのできるプラスチックボトルとして有用である。   As described above, the plastic bottle according to the present invention can prevent as much as possible that the movable part is difficult to be extruded and pushed out while maintaining good self-supporting property in a state where the movable part is extruded. It is useful as a plastic bottle that can change the internal volume by expansion and contraction in the height direction by pushing and pushing back a movable part formed on the bottom.

本発明の実施の一形態に係り、底部の可動部が押出された状態のプラスチックボトルを示す一部切り欠き側面図である。It is a partially cutaway side view showing a plastic bottle in a state where a movable part at the bottom is extruded according to one embodiment of the present invention. 本発明の実施の一形態に係り、底部の可動部が押戻された状態のプラスチックボトルを示す一部切り欠き側面図である。It is a partially cutaway side view showing a plastic bottle in a state where a movable part at the bottom is pushed back according to one embodiment of the present invention. 図１に示すプラスチックボトルの底部を示す平面図である。It is a top view which shows the bottom part of the plastic bottle shown in FIG. 図１に示すプラスチックボトルの底部から見た斜視図である。It is the perspective view seen from the bottom part of the plastic bottle shown in FIG.

符号の説明Explanation of symbols

１０ プラスチックボトル
１１ 口部
１２ 肩部
１３ 胴部
１５ 底部
１５ａ 外縁部
１６ａ〜１６ｈ カット面
２０ 可動部
２１ 傾斜部
２１１ 外縁線部
２１２ 内縁線部
２２ 定常部
２２（１） 平坦部
２２（２） 凹部
２２１ 境界線部
２５ａ〜２５ｈ 頂点
２６ａ〜２６ｈ 頂点
２７ａ〜２７ｈ Ｖ字状溝 DESCRIPTION OF SYMBOLS 10 Plastic bottle 11 Mouth part 12 Shoulder part 13 Body part 15 Bottom part 15a Outer edge part 16a-16h Cut surface 20 Movable part 21 Inclined part 211 Outer edge line part 212 Inner edge line part 22 Steady part 22 (1) Flat part 22 (2) Recessed part 221 Boundary part 25a-25h Vertex 26a-26h Vertex 27a-27h V-shaped groove

Claims (4)

胴部に続いて形成される底部に押出し及び押入れ可能となる可動部の形成されたプラスチックボトルであって、
前記可動部は、
前記底部の外縁部から傾斜して延びる環状の傾斜部と、
該傾斜部に囲まれる定常部とを有し、
前記底部の前記外縁部との境界となる前記傾斜部の外縁線部が、正多角形の各頂点を結んだ線状となって、前記押出し及び押入れの各方向に屈曲可能となり、
前記定常部との境界となる前記傾斜部の内縁線部が、前記外縁線部と実質的に平行となって、前記押出し及び押入れの各方向に屈曲可能となり、
前記傾斜部には、前記外縁線部の各頂点と前記内縁線部の対応する頂点とを結ぶＶ字状溝が形成されていることを特徴とするプラスチックボトル。 A plastic bottle formed with a movable part that can be extruded and pushed into the bottom formed following the body part,
The movable part is
An annular inclined portion extending obliquely from the outer edge of the bottom,
A stationary part surrounded by the inclined part,
The outer edge line part of the inclined part which becomes the boundary with the outer edge part of the bottom part becomes a line connecting each vertex of a regular polygon, and can be bent in each direction of the extrusion and the closet,
The inner edge line part of the inclined part that becomes a boundary with the stationary part is substantially parallel to the outer edge line part, and can be bent in each direction of the pushing and pressing,
A V-shaped groove that connects each vertex of the outer edge line portion and a corresponding vertex of the inner edge line portion is formed in the inclined portion. 前記胴部から前記底部の外縁部にかけて前記傾斜部の前記外縁線部の各頂点間の辺に向けたカット面が形成されたことを特徴とする請求項１記載のプラスチックボトル。   2. The plastic bottle according to claim 1, wherein a cut surface is formed from the body portion to an outer edge portion of the bottom portion toward a side between each vertex of the outer edge line portion of the inclined portion. 前記定常部は、前記傾斜部の内縁線部から延びる平坦部と、
該平坦部から続く凹部とを有することを特徴とする請求項１または２記載のプラスチックボトル。 The stationary part is a flat part extending from an inner edge line part of the inclined part,
The plastic bottle according to claim 1, further comprising a concave portion continuing from the flat portion. 前記平坦部と前記凹部との境界線部は、前記傾斜部の前記内縁線部と実質的に平行となることを特徴とする請求項３記載のプラスチックボトル。   The plastic bottle according to claim 3, wherein a boundary line portion between the flat portion and the concave portion is substantially parallel to the inner edge line portion of the inclined portion.
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Publication number Priority date Publication date Assignee Title
JP2012513943A (en) * 2008-12-31 2012-06-21 プラスチパック パッケージング，インコーポレイテッド High temperature fillable plastic container with flexible base
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JP2013144560A (en) * 2012-01-16 2013-07-25 Toyo Seikan Group Holdings Ltd Synthetic resin made container
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