JP2010241477A - Pressure-resistant bottle - Google Patents

Pressure-resistant bottle Download PDF

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JP2010241477A
JP2010241477A JP2009093788A JP2009093788A JP2010241477A JP 2010241477 A JP2010241477 A JP 2010241477A JP 2009093788 A JP2009093788 A JP 2009093788A JP 2009093788 A JP2009093788 A JP 2009093788A JP 2010241477 A JP2010241477 A JP 2010241477A
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pressure
bottle
resistant bottle
resistant
leg
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JP5722529B2 (en
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Kazuya Hirose
瀬 量 哉 広
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Dai Nippon Printing Co Ltd
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Dai Nippon Printing Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a pressure-resistant bottle capable of reducing deformation of a bottom when the pressure inside the bottle is positive, and preventing consumers from misunderstanding a content since the appearance shape is close to that of a general bottle. <P>SOLUTION: The pressure-resistant bottle 10 includes a mouth 11, a barrel 12 and a bottom 20. The bottom 20 has a plurality of legs 21 extending from the center 20a to a circumferential edge 20b, and projecting downward, and a flat face 22 extending upwardly from the center 20a to the circumferential edge 20b is formed in each part between the legs 21. A circumferential edge 21d of each leg 21 is inwardly recessed in the radial direction from the barrel 12, and forms a circumferential edge stepped part 26 together with the circumferential edge 22a of each flat face 22. Thus, the deformation of the bottom 20 can be suppressed when the pressure inside the pressure-resistant bottle 10 is positive. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、内部を陽圧とした状態で使用される例えばポリエチレンテレフタレート製の耐圧用ボトルに係り、とりわけボトル内部を陽圧とした際に高い強度を有する耐圧用ボトルに関する。   The present invention relates to a pressure-resistant bottle made of, for example, polyethylene terephthalate, which is used with a positive pressure inside, and more particularly to a pressure-resistant bottle having high strength when the inside of the bottle is set to a positive pressure.

近年、プラスチックボトルに使用されるプラスチック材料の使用量を減らすことにより、プラスチックボトルを軽量化することが望まれている。しかしながら、ボトルを軽量化した場合、ボトルの強度が弱くなってしまう。このため、ボトルを段ボール箱内に梱包し、段ボール箱を積載して倉庫内に保存する際に、段ボール箱の段積み数を減らす必要が生じる。   In recent years, it has been desired to reduce the weight of plastic bottles by reducing the amount of plastic material used in the plastic bottles. However, when the bottle is lightened, the strength of the bottle is weakened. For this reason, it is necessary to reduce the number of stacked cardboard boxes when the bottles are packed in the cardboard boxes and the cardboard boxes are loaded and stored in the warehouse.

また、ボトルを自動販売機で販売するときに、自動販売機から正常に排出できなかったり、自動販売機内での保存中や排出時にボトルが凹む問題が生じやすい。これを解決するために、ボトル飲料を製造する工程において、ボトルに内容液を充填した直後に窒素等の不活性ガスをボトル内に充填してボトルを閉栓する技術がある。これにより、ボトル内部は陽圧となり、ボトルの強度を高くすることが可能である。なお、このようにボトル内部を窒素等の不活性ガスで満たすことは、内容液（例えば緑茶）の酸化を防止する効果もある。   In addition, when selling bottles with vending machines, there is a tendency that the bottles cannot be normally discharged from the vending machine or the bottles are recessed during storage or discharging in the vending machine. In order to solve this, there is a technique of filling a bottle with an inert gas such as nitrogen immediately after filling the bottle with the content liquid in the process of manufacturing the bottle beverage, and closing the bottle. Thereby, the inside of a bottle becomes a positive pressure and it is possible to raise the intensity | strength of a bottle. In addition, filling the inside of the bottle with an inert gas such as nitrogen as described above also has an effect of preventing the content liquid (for example, green tea) from being oxidized.

また、天然発泡水（スパークリングウォーター）や酸素水等をボトルに充填した場合、ボトル内はわずかに陽圧となる。あるいは緑茶またはコーヒー等の内容液をボトルに充填し、このボトルを加温すると、内容液や内部の空気の熱膨張により、ボトル内が陽圧となる。   Further, when natural foaming water (sparkling water) or oxygen water is filled in the bottle, the inside of the bottle is slightly positive. Alternatively, when the bottle is filled with a content liquid such as green tea or coffee and the bottle is heated, the inside of the bottle becomes positive pressure due to thermal expansion of the content liquid or the air inside.

このように、ボトル内部が陽圧となる場合、図８に示すような一般的な形状の底部１０１を有するボトル１００を用いると、ボトル１００内が陽圧になることにより底部１０１が膨らんでボトル１００の全高が高くなってしまう。あるいは、底部１０１の凹凸が反転（バックリング）することにより、ボトル１００が正立しなくなってしまう。   In this way, when the inside of the bottle has a positive pressure, when the bottle 100 having the bottom portion 101 having a general shape as shown in FIG. 8 is used, the bottom portion 101 expands due to the inside of the bottle 100 becoming a positive pressure. The total height of 100 becomes high. Or the unevenness | corrugation of the bottom part 101 will be reversed (buckling), and the bottle 100 will not stand upright.

このため、ボトルに耐圧性を持たせるために底部をペタロイド形状とすることが一般的に行われている。また、底部をペタロイド形状とする技術のほか、図９に示すように底部１０１へ補強溝１０２を設けたり、底部を特公平３−３９８９７（特許文献１）に示す形状とする技術が存在する。   For this reason, in order to give a bottle pressure resistance, it is common practice to make the bottom part a petaloid shape. In addition to the technique of making the bottom part petaloid, there is a technique of providing the reinforcing groove 102 in the bottom part 101 as shown in FIG. 9 or making the bottom part the shape shown in Japanese Patent Publication No. 3-39897 (Patent Document 1).

特公平３−３９８９７号公報Japanese Patent Publication No. 3-39897

ペタロイド形状の底部を有するプラスチックボトルは耐圧性に優れているため、その多くは炭酸飲料を充填して販売するために使用されている。このため消費者には、ペタロイド形状の底部を有するプラスチックボトルには炭酸飲料が充填されている、というイメージが強い。したがって、消費者が内容物を誤解することを避けるため、このようなペタロイド形状の底部を有するプラスチックボトルを緑茶またはコーヒー等の容器として用いることは事実上困難となっている。   Since plastic bottles having a petaloid-shaped bottom are excellent in pressure resistance, many of them are used for filling and selling carbonated beverages. For this reason, consumers have a strong image that a plastic bottle having a petaloid-shaped bottom is filled with a carbonated beverage. Therefore, it is practically difficult to use a plastic bottle having such a petaloid-shaped bottom as a container of green tea or coffee in order to avoid misunderstanding the contents by the consumer.

また、図９および特公平３−３９８９７（特許文献１）に示すボトルは、耐圧性能に劣るため、ボトル内の圧力をあまり高くすることができない。   Moreover, since the bottle shown in FIG. 9 and Japanese Patent Publication No. 3-39897 (patent document 1) is inferior in pressure | voltage resistant performance, the pressure in a bottle cannot be made very high.

本発明はこのような点を考慮してなされたものであり、ボトル内部を陽圧にした際の変形を少なくすることができ、かつ消費者が内容物を誤解しないように、外観を一般的なボトルの外観に近くした耐圧用ボトルを提供することを目的とする。   The present invention has been made in consideration of the above points, and can reduce the deformation when the inside of the bottle is made positive pressure, and has a general appearance so that consumers do not misunderstand the contents. An object of the present invention is to provide a pressure resistant bottle close to the appearance of a simple bottle.

本発明は、耐圧用ボトルにおいて、口部と、胴部と、底部とを備え、底部は、中央部から周縁部に延びるとともに下方へ突出する複数の脚部を有し、各脚部間に中央部から周縁部に向かって上方へ延びる平坦面が形成され、各脚部の周縁部は、胴部から半径方向内方に引っ込んで各平坦面の周縁部とともに周縁段部を形成することを特徴とする耐圧用ボトルである。   The present invention relates to a pressure-resistant bottle, comprising a mouth portion, a trunk portion, and a bottom portion, and the bottom portion has a plurality of leg portions that extend from the center portion to the peripheral edge portion and project downward, between each leg portion. A flat surface extending upward from the central part toward the peripheral part is formed, and the peripheral part of each leg part is retracted radially inward from the trunk part to form a peripheral step part together with the peripheral part of each flat surface. This is a pressure-resistant bottle.

本発明は、各平坦面は、中央部から周縁部に向かう断面において下方へ向けて湾曲するドーム状曲面の一部を構成することを特徴とする耐圧用ボトルである。   The present invention is the pressure-resistant bottle characterized in that each flat surface constitutes a part of a dome-shaped curved surface that curves downward in a cross section from the central portion toward the peripheral portion.

本発明は、底部は、奇数個の脚部を有することを特徴とする耐圧用ボトルである。   The present invention is the pressure-resistant bottle characterized in that the bottom portion has an odd number of legs.

本発明は、各脚部の突出高さが胴部の径の１０％〜２０％であることを特徴とする耐圧用ボトルである。   The present invention is the pressure resistant bottle characterized in that the protruding height of each leg portion is 10% to 20% of the diameter of the trunk portion.

本発明は、底部の中央部に上方へ引っ込む凹部が形成されていることを特徴とする耐圧用ボトルである。   The present invention is a pressure-resistant bottle characterized in that a recess that is retracted upward is formed in the center of the bottom.

本発明によれば、底部は、中央部から周縁部に延びるとともに下方へ突出する複数の脚部を有し、各脚部間に中央部から周縁部に向かって上方へ延びる平坦面が形成されている。このことにより、耐圧用ボトル内部を陽圧にした際の変形を少なくすることができる。また、耐圧用ボトルを薄肉とした場合であっても、底部の強度を高くすることができる。   According to the present invention, the bottom portion has a plurality of leg portions that extend from the central portion to the peripheral portion and project downward, and a flat surface that extends upward from the central portion toward the peripheral portion is formed between the leg portions. ing. This can reduce deformation when the pressure bottle is made positive. Even when the pressure-resistant bottle is thin, the strength of the bottom can be increased.

また本発明によれば、各脚部の周縁部は、胴部から半径方向内方に引っ込んで各平坦面の周縁部とともに周縁段部を形成している。このことにより、耐圧用ボトル外方から見て底部の脚部が目立たないため、外観が一般的なボトルの外観に似ており、消費者が耐圧用ボトルの内容物を誤解するおそれがない。   Moreover, according to this invention, the peripheral part of each leg part is drawn inward in radial direction from the trunk | drum, and forms the peripheral step part with the peripheral part of each flat surface. As a result, the bottom leg portion is not conspicuous when viewed from the outside of the pressure-resistant bottle, so that the appearance is similar to that of a general bottle, and there is no possibility that the consumer misunderstands the contents of the pressure-resistant bottle.

図１は、本発明の一実施の形態による耐圧用ボトルを示す正面図。FIG. 1 is a front view showing a pressure-resistant bottle according to an embodiment of the present invention. 図２は、本発明の一実施の形態による耐圧用ボトルの底部を示す斜視図。FIG. 2 is a perspective view showing the bottom of a pressure-resistant bottle according to an embodiment of the present invention. 図３は、本発明の一実施の形態による耐圧用ボトルの底部を示す底面図（図１のIII方向矢視図）。FIG. 3 is a bottom view showing the bottom of the pressure-resistant bottle according to one embodiment of the present invention (viewed in the direction of arrow III in FIG. 1). 図４は、本発明の一実施の形態による耐圧用ボトルの底部を示す垂直断面図（図３のIV−IV線断面図）。FIG. 4 is a vertical sectional view (sectional view taken along line IV-IV in FIG. 3) showing the bottom of the pressure-resistant bottle according to one embodiment of the present invention. 図５は、本発明の一実施の形態の変形例による耐圧用ボトルの底部を示す斜視図（図２に対応する図）。FIG. 5 is a perspective view showing the bottom of a pressure-resistant bottle according to a modification of the embodiment of the present invention (a diagram corresponding to FIG. 2). 図６は、本発明の一実施例における、耐圧用ボトルの底深さの変化量を示すグラフ。FIG. 6 is a graph showing the amount of change in the bottom depth of the pressure bottle in one embodiment of the present invention. 図７は、本発明の一実施例における、耐圧用ボトルの全高変化量を示すグラフ。FIG. 7 is a graph showing the total height change amount of the pressure bottle in one embodiment of the present invention. 図８は、従来のボトルの底部を示す図。FIG. 8 is a view showing the bottom of a conventional bottle. 図９は、従来のボトルの底部を示す図。FIG. 9 is a view showing the bottom of a conventional bottle.

以下、図面を参照して本発明の実施の形態について説明する。図１乃至図５は本発明の一実施の形態を示す図である。   Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 are views showing an embodiment of the present invention.

まず、図１乃至図４により本実施の形態による耐圧用ボトルの概要について説明する。なお、本明細書中、「平坦面」とは、表面に凹凸を有していない滑らかな面という意味で用いている。ただしシボ等の微細な凹凸を有していても、「平坦面」とみなす。また本明細書中、「上方」、「下方」とは、それぞれ耐圧用ボトル１０を正立させた状態（図１）における上方、下方のことをいう。   First, an outline of a pressure-resistant bottle according to the present embodiment will be described with reference to FIGS. In the present specification, “flat surface” is used to mean a smooth surface having no irregularities on the surface. However, even if it has fine irregularities such as wrinkles, it is regarded as a “flat surface”. In the present specification, “upper” and “lower” refer to the upper and lower sides in the state where the pressure-resistant bottle 10 is erected (FIG. 1), respectively.

図１に示すように耐圧用ボトル１０は、口部１１と、口部１１下方に設けられた胴部１２と、胴部１２下方に設けられた底部２０とを備えている。   As shown in FIG. 1, the pressure-resistant bottle 10 includes a mouth portion 11, a body portion 12 provided below the mouth portion 11, and a bottom portion 20 provided below the body portion 12.

この耐圧用ボトル１０は、ポリエチレンテレフタレート（以下、ＰＥＴと略記する）を射出成形して製作したプリフォームを二軸延伸ブロー成形したものである。なおプリフォームすなわち耐圧用ボトル１０の材料としては、ＰＥＴの他、ポリプロピレン（ＰＰ）、ポリ乳酸（ＰＬＡ）、または他の様々な熱可塑性樹脂を用いることも可能である。   This pressure-resistant bottle 10 is a biaxially stretched blow molded preform formed by injection molding polyethylene terephthalate (hereinafter abbreviated as PET). In addition, as a material of the preform, that is, the pressure-resistant bottle 10, polypropylene (PP), polylactic acid (PLA), or various other thermoplastic resins can be used in addition to PET.

また、プリフォームを多層構造とし、中間層に酸素吸収層を設けても良い。中間層としては、エチレン−酢酸ビニル共重合体ケン化物（以下、ＥＶＯＨと略記する）やＭＸＤ６（ポリメタキシリレンアジパミド）などのガスバリヤー性樹脂層を積層した構成を採ることができる。二種以上の合成樹脂のブレンド成形の場合は、例えば、ＰＥＴにＭＸＤ６などのガスバリヤー性樹脂をブレンドしてプリフォームを射出成形することにより、ガスバリヤー性を向上させることができる。また、合成樹脂のほかに酸素吸収剤をＰＥＴにブレンドすることによっても、酸素バリヤー性を向上させることができる。   Further, the preform may have a multilayer structure, and an oxygen absorption layer may be provided in the intermediate layer. As the intermediate layer, a structure in which a gas barrier resin layer such as saponified ethylene-vinyl acetate copolymer (hereinafter abbreviated as EVOH) or MXD6 (polymetaxylylene adipamide) is laminated can be employed. In the case of blend molding of two or more kinds of synthetic resins, the gas barrier property can be improved by, for example, blending a gas barrier resin such as MXD6 with PET and injection molding the preform. Also, oxygen barrier properties can be improved by blending an oxygen absorbent in addition to the synthetic resin into PET.

さらに、ボトル容器内壁にシリカ、アルミナなどの無機酸化物や非晶性カーボンを蒸着することにより、透明性を維持しながらガスバリヤー性を向上させることができる。コーティング手段を用いる場合は、メタキシレンジアミンとエピクロルヒドリンを反応させた芳香族系多価エポキシ化合物と多価アミンとの熱硬化型架橋塗膜や、ＥＶＯＨなどをコーティングすることにより、ガスバリヤー性を向上させることができる。ＥＶＯＨをコーティングした場合は、吸湿によりガスバリヤー性が低下するため、その上にポリオレフィン系樹脂などの防湿性樹脂をコーティングすることが好ましい。このようなガスバリヤー性向上手段は、いずれか一種を用いてもよいが、二種以上の手段を組み合わせて用いることにより、一層ガスバリヤー性を向上させることができる。   Furthermore, by depositing an inorganic oxide such as silica or alumina or amorphous carbon on the inner wall of the bottle container, the gas barrier property can be improved while maintaining transparency. When coating means are used, gas barrier properties are improved by coating thermosetting cross-linked coating films of aromatic polyhydric epoxy compounds reacted with metaxylenediamine and epichlorohydrin and polyhydric amines, EVOH, etc. Can be made. When EVOH is coated, gas barrier properties are reduced due to moisture absorption. Therefore, it is preferable to coat a moisture-proof resin such as a polyolefin resin thereon. Any one kind of such gas barrier property improving means may be used, but the gas barrier property can be further improved by combining two or more means.

図１乃至図４に示すように、底部２０は、中央部２０ａから周縁部２０ｂに延びるとともに下方へ突出する７個（複数個）の脚部２１を有している。   As shown in FIGS. 1 to 4, the bottom portion 20 has seven (a plurality) leg portions 21 that extend from the central portion 20a to the peripheral edge portion 20b and project downward.

この脚部２１は、耐圧用ボトル１０を安定して正立させるためには３個以上設けることが好ましいが、成形性の観点から、その上限は１５個程度となる。また、バックリングを効果的に防止するために、脚部２１の個数を奇数個とすることが好ましく、７個または９個とすることが更に好ましい。   Three or more leg portions 21 are preferably provided in order to stably erect the pressure-resistant bottle 10, but the upper limit is about 15 from the viewpoint of formability. In order to effectively prevent buckling, the number of leg portions 21 is preferably an odd number, more preferably 7 or 9.

図２および図３に示すように、７個の脚部２１は、底部２０の周縁部２０ｂに沿って等間隔に配置されている。   As shown in FIGS. 2 and 3, the seven leg portions 21 are arranged at equal intervals along the peripheral edge portion 20 b of the bottom portion 20.

また図３および図４に示すように、各脚部２１は、接地面２１ａと、接地面２１ａから中央部２０ａ側に向けて上方に延びる内側傾斜面２１ｂと、接地面２１ａから周縁部２０ｂ側に向けて上方に延びる外側傾斜面２１ｃとを有している。このうち内側傾斜面２１ｂは、底面方向から見て略三角形形状を有している（図３参照）。   Further, as shown in FIGS. 3 and 4, each leg 21 includes a grounding surface 21a, an inner inclined surface 21b extending upward from the grounding surface 21a toward the central portion 20a, and a peripheral portion 20b side from the grounding surface 21a. And an outer inclined surface 21c extending upward. Among these, the inner inclined surface 21b has a substantially triangular shape when viewed from the bottom surface direction (see FIG. 3).

一方、各脚部２１間には、中央部２０ａから周縁部２０ｂに向かって上方へ延びる平坦面２２が形成されている。各平坦面２２は、中央部２０ａから周縁部２０ｂに向かう断面において、下方へ向けて湾曲するドーム状曲面の一部を構成する（図４参照）。この場合、各平坦面２２は、球面の一部からなることが好ましい。   On the other hand, between each leg part 21, the flat surface 22 extended upwards toward the peripheral part 20b from the center part 20a is formed. Each flat surface 22 constitutes a part of a dome-shaped curved surface that curves downward in a cross section from the central portion 20a to the peripheral edge portion 20b (see FIG. 4). In this case, each flat surface 22 is preferably made of a part of a spherical surface.

さらに、各脚部２１の周縁部２１ｄは、胴部１２から半径方向内方に引っ込んで各平坦面２２の周縁部２２ａとともに周縁段部２６を形成している。すなわち周縁段部２６は、底部２０の全周にわたって円環状に設けられており（図３参照）、また周縁段部２６の垂直断面は、下方に突出する円弧形状を有している（図４参照）。   Further, the peripheral edge portion 21 d of each leg portion 21 is retracted radially inward from the body portion 12 to form a peripheral step portion 26 together with the peripheral edge portion 22 a of each flat surface 22. That is, the peripheral step portion 26 is provided in an annular shape over the entire circumference of the bottom portion 20 (see FIG. 3), and the vertical cross section of the peripheral step portion 26 has an arc shape protruding downward (see FIG. 4). reference).

このような耐圧用ボトル１０のサイズは限定されるものではなく、どのようなサイズのボトルからなっていても良い。例えば図４において、耐圧用ボトル１０の容量が５００ｍｌである場合、胴部１２の径φを６０ｍｍ乃至７０ｍｍとし、底部２０の底深さ（すなわち各脚部２１の接地面２１ａと底部２０の中央部２０ａとの距離）ｈ1を２ｍｍ乃至６ｍｍとすることが好ましい。また、各脚部２１を目立たなくするため、各脚部２１の突出高さｈ2は、底部２０の強度を損なわない限度で低くすることが好ましい。具体的には、各脚部２１の突出高さｈ2を胴部の径の１０％〜２０％とすることが好ましい。 The size of the pressure-resistant bottle 10 is not limited and may be any size bottle. For example, in FIG. 4, when the capacity of the pressure-resistant bottle 10 is 500 ml, the diameter φ of the body portion 12 is set to 60 mm to 70 mm, and the bottom depth of the bottom portion 20 (that is, the ground surface 21a of each leg portion 21 and the center of the bottom portion 20). The distance h 1 from the portion 20a is preferably 2 mm to 6 mm. Moreover, in order to make each leg 21 inconspicuous, it is preferable to make the protrusion height h 2 of each leg 21 low as long as the strength of the bottom 20 is not impaired. Specifically, it is preferable that the protruding height h 2 of each leg portion 21 is 10% to 20% of the diameter of the trunk portion.

なお例えば耐圧用ボトル１０の容量が３５０ｍｌ以下である場合は、胴部１２の径φが５０ｍｍ乃至６８ｍｍ、１０００ｍｌの場合は胴部１２の径φが７０ｍｍ乃至９０ｍｍ、１５００ｍｌの場合は胴部１２の径φが８０ｍｍ乃至１００ｍｍであり、脚部２１の突出高さｈ2はそれぞれの胴部１２の径φの１０％から２０％とすることが好ましい。 For example, when the capacity of the pressure-resistant bottle 10 is 350 ml or less, the diameter φ of the body 12 is 50 to 68 mm, and when 1000 ml, the diameter 12 of the body 12 is 70 mm to 90 mm, and when 1500 ml, The diameter φ is 80 mm to 100 mm, and the protruding height h 2 of the leg portion 21 is preferably 10% to 20% of the diameter φ of each trunk portion 12.

また、中央部２０ａから周縁部２０ｂに向かう断面において、各脚部２１の接地面２１ａの曲率半径Ｒ1を３ｍｍ乃至７ｍｍとし、周縁段部２６の曲率半径Ｒ2を１ｍｍ乃至３ｍｍとすることが好ましい。さらに、胴部１２の肉厚ｔ1を０．１ｍｍ乃至０．５ｍｍとし、周縁段部２６の水平方向の幅ｗを１ｍｍ乃至２ｍｍとすることが好ましい。 Further, in the cross section extending from the central portion 20a to the peripheral portion 20b, and the radius of curvature R 1 of the ground surface 21a of each leg 21 and 3mm or 7 mm, a curvature radius R 2 of the peripheral step portion 26 be 1mm to 3mm preferable. Furthermore, it is preferable that the thickness t 1 of the trunk portion 12 is 0.1 mm to 0.5 mm, and the horizontal width w of the peripheral step portion 26 is 1 mm to 2 mm.

次にこのような構成からなる本実施の形態の作用について説明する。   Next, the operation of the present embodiment having such a configuration will be described.

まず耐圧用ボトル１０内に、例えば緑茶等の内容液を充填し、その後、窒素等の不活性ガスをヘッドスペース内に充填して閉栓する。この際、充填された不活性ガスまたは内容液により、耐圧用ボトル１０内部は陽圧（たとえば２０〜９０ｋＰａ）となる。   First, the pressure-resistant bottle 10 is filled with a content liquid such as green tea, and then an inert gas such as nitrogen is filled in the head space and then closed. At this time, the inside of the pressure-resistant bottle 10 becomes a positive pressure (for example, 20 to 90 kPa) by the filled inert gas or content liquid.

耐圧用ボトル１０内部が陽圧となることにより、耐圧用ボトル１０の内側から外側への力が作用し、底部２０においては、およそ上方から下方へ向けて圧力が加わる。   When the inside of the pressure-resistant bottle 10 becomes a positive pressure, a force from the inside to the outside of the pressure-resistant bottle 10 acts, and pressure is applied from the upper side to the lower side at the bottom 20.

これに対して本実施の形態において、底部２０は、中央部２０ａから周縁部２０ｂに延びるとともに下方へ突出する７個の脚部２１を有し、各脚部２１間に中央部２０ａから周縁部２０ｂに向かって上方へ延びる平坦面２２が形成されている。この各平坦面２２は、中央部２０ａから周縁部２０ｂに向かう断面において下方へ向けて湾曲するドーム状曲面の一部を構成する。したがって、耐圧用ボトル１０内が陽圧になり底部２０に下方向の力が加わっても、底部２０に応力が集中しにくい形状となっているため、底部２０が変形しにくい。さらに、隣り合う脚部２１と、各脚部２１間に位置する平坦面２２とがリブ構造を形成するため、これによっても底部２０の変形を防止するように作用する。   On the other hand, in the present embodiment, the bottom portion 20 has seven leg portions 21 that extend from the central portion 20a to the peripheral edge portion 20b and project downward, and between the leg portions 21, the central portion 20a extends to the peripheral edge portion. A flat surface 22 extending upward toward 20b is formed. Each flat surface 22 constitutes a part of a dome-shaped curved surface that curves downward in a cross section from the central portion 20a to the peripheral edge portion 20b. Therefore, even if the pressure bottle 10 has a positive pressure and a downward force is applied to the bottom portion 20, the bottom portion 20 is not easily deformed because the stress hardly concentrates on the bottom portion 20. Furthermore, since the adjacent leg portions 21 and the flat surface 22 located between the leg portions 21 form a rib structure, this also acts to prevent the deformation of the bottom portion 20.

すなわち、平坦面２２が下方へ突出するドーム形状からなっているため、耐圧用ボトル１０内の圧力が増加することにより底部２０の平坦面２２が下方に変形しはじめても、底部２０全体が反転することがない（すなわちバックリング現象が生じない）。また耐圧用ボトル１０内の圧力が高まった場合、胴部１２が半径方向に広がるように作用するが、周縁段部２６が形成されていることにより、胴部１２が半径方向へ広がりにくい。   That is, since the flat surface 22 has a dome shape protruding downward, even if the flat surface 22 of the bottom 20 starts to deform downward due to an increase in pressure in the pressure-resistant bottle 10, the entire bottom 20 is reversed. (That is, no buckling phenomenon occurs). Further, when the pressure in the pressure-resistant bottle 10 increases, the body portion 12 acts so as to expand in the radial direction. However, since the peripheral step portion 26 is formed, the body portion 12 is difficult to expand in the radial direction.

ところで、この耐圧用ボトル１０を小売店の販売棚に置いた場合、またはテーブルの上に置いた場合を考える。この場合、底部２０と胴部１２との間に周縁段部２６が形成されており、各脚部２１の周縁部２１ｄが、胴部１２から半径方向内方に引っ込んでいる。このことにより、外観上脚部２１が見えにくく、目立たない。すなわち、耐圧用ボトル１０の底部２０は、一般的なペタロイド形状の底部と同様に、下方へ突出した脚部２１を有しているが、この脚部２１が目立たないようになっている。この結果、底部２０は、外観上あたかも図８または図９に示すような通常の底部であるかのように見える。   By the way, a case where the pressure-resistant bottle 10 is placed on a sales shelf of a retail store or placed on a table is considered. In this case, the peripheral step portion 26 is formed between the bottom portion 20 and the trunk portion 12, and the peripheral edge portion 21 d of each leg portion 21 is retracted radially inward from the trunk portion 12. As a result, the upper leg portion 21 is difficult to see and is inconspicuous. That is, the bottom part 20 of the pressure-resistant bottle 10 has a leg part 21 that protrudes downward like the general petaloid-shaped bottom part, but the leg part 21 is not conspicuous. As a result, the bottom 20 looks as if it is a normal bottom as shown in FIG. 8 or FIG.

さらに本実施の形態においては、図４に示すように、胴径φが６０ｍｍ乃至７０ｍｍであるのに対し、脚部２１の突出高さｈ2を８ｍｍ乃至１２ｍｍと短くしていることも、脚部２１を目立たなくすることに寄与している。 Furthermore, in the present embodiment, as shown in FIG. 4, while the trunk diameter φ is 60 mm to 70 mm, the protruding height h 2 of the leg 21 is shortened to 8 mm to 12 mm. This contributes to making the portion 21 inconspicuous.

このように本実施の形態によれば、底部２０は、中央部２０ａから周縁部２０ｂに延びるとともに下方へ突出する複数の脚部２１を有し、各脚部２１間に中央部２０ａから周縁部２０ｂに向かって上方へ延びる平坦面２２が形成されている。また各平坦面２２は、中央部２０ａから周縁部２０ｂに向かう断面において下方へ向けて湾曲するドーム状曲面の一部を構成する。さらに、各脚部２１の周縁部２１ｄは、胴部１２から半径方向内方に引っ込んで各平坦面２２の周縁部２２ａとともに周縁段部２６を形成している。このことにより、底部２０の強度が高められ、耐圧用ボトル１０の内部を陽圧にした際、底部２０の変形（バックリング等）を防止することができる。   As described above, according to the present embodiment, the bottom portion 20 has the plurality of leg portions 21 extending from the central portion 20a to the peripheral edge portion 20b and protruding downward, and between the leg portions 21, the central portion 20a extends to the peripheral edge portion. A flat surface 22 extending upward toward 20b is formed. Each flat surface 22 constitutes a part of a dome-shaped curved surface that curves downward in a cross section from the central portion 20a to the peripheral edge portion 20b. Further, the peripheral edge portion 21 d of each leg portion 21 is retracted radially inward from the body portion 12 to form a peripheral step portion 26 together with the peripheral edge portion 22 a of each flat surface 22. Accordingly, the strength of the bottom portion 20 is increased, and deformation (buckling or the like) of the bottom portion 20 can be prevented when the inside of the pressure-resistant bottle 10 is set to a positive pressure.

また本実施の形態によれば、耐圧用ボトル１０外方から見て底部２０の脚部２１が目立ちにくいため、耐圧用ボトル１０の外観形状が一般的なボトルの外観形状に近く、消費者が耐圧用ボトル１０の内容物を誤解するおそれがない。   Further, according to the present embodiment, since the leg portion 21 of the bottom 20 is not noticeable when viewed from the outside of the pressure-resistant bottle 10, the appearance shape of the pressure-resistant bottle 10 is close to the appearance shape of a general bottle, and the consumer There is no possibility of misunderstanding the contents of the pressure-resistant bottle 10.

なお耐圧用ボトル１０は外観形状が一般的なボトルの外観形状に近いため、耐圧用ボトル１０内部を非陽圧として用いる事も可能である。たとえば、ある時は緑茶を充填した後に窒素を充填して耐圧用ボトル１０内を陽圧にして自動販売機用の商品とし、別のときは同じ耐圧用ボトル１０に緑茶のみを充填し非自動販売機用の商品とする事も可能である。そのためボトル用の金型を２種類用意する必要が無く、したがってボトルの生産工場においては金型を交換する必要も無いため、金型投資費用や交換時間を節約できる、という副次効果もある。   The pressure-resistant bottle 10 has an appearance shape close to that of a general bottle, so that the inside of the pressure-resistant bottle 10 can be used as a non-positive pressure. For example, in some cases, green tea is filled and then nitrogen is filled to make the pressure bottle 10 positive pressure so that it becomes a product for a vending machine. In other cases, the same pressure bottle 10 is filled only with green tea and is not automatic. It is also possible to make a product for a vending machine. Therefore, it is not necessary to prepare two types of bottle molds, and therefore it is not necessary to replace the molds in the bottle production factory, so that there is a secondary effect that the mold investment cost and the replacement time can be saved.

（変形例）
なお、図５に示すように、底部２０の中央部２０ａに、上方へ引っ込む凹部２４を形成しても良い。この場合、図１乃至図４に示す耐圧用ボトル１０と同様の効果を得ることができる。さらに、凹部２４が設けられていることにより、底部２０の強度が更に増加し、耐圧用ボトル１０内の圧力によって底部２０が変形することをより効果的に防止することができる。 (Modification)
In addition, as shown in FIG. 5, you may form the recessed part 24 recessed upwards in the center part 20a of the bottom part 20. As shown in FIG. In this case, the same effect as the pressure-resistant bottle 10 shown in FIGS. 1 to 4 can be obtained. Further, the provision of the recess 24 further increases the strength of the bottom 20, and can more effectively prevent the bottom 20 from being deformed by the pressure in the pressure-resistant bottle 10.

また、耐圧用ボトル１０は、プリフォーム（図示しない）を二軸延伸ブロー成形することにより成形され、プリフォームは射出成形法により製造される。このプリフォームの底部（耐圧用ボトル１０の底部２０に相当する部分）には、射出成形装置の注入ゲートに対応するゲート部が形成される。図５に示す変形例において、耐圧用ボトル１０の底部２０に凹部２４を形成したことにより、このゲート部を目立ちにくくする効果もある。   The pressure-resistant bottle 10 is formed by biaxially stretching blow-molding a preform (not shown), and the preform is manufactured by an injection molding method. A gate portion corresponding to the injection gate of the injection molding apparatus is formed on the bottom portion of the preform (the portion corresponding to the bottom portion 20 of the pressure-resistant bottle 10). In the modification shown in FIG. 5, the formation of the recess 24 in the bottom 20 of the pressure-resistant bottle 10 has an effect of making the gate portion less noticeable.

次に、本実施の形態における具体的実施例を説明する。   Next, specific examples in the present embodiment will be described.

まず図１に示す耐圧用ボトル１０（実施例）を作製した。この場合、１８ｇのプリフォームを二軸延伸ブロー成形することにより、耐圧用ボトル１０（実施例）を作製した。   First, a pressure-resistant bottle 10 (Example) shown in FIG. 1 was produced. In this case, a pressure-resistant bottle 10 (Example) was produced by biaxially stretching blow-molding an 18 g preform.

次に、耐圧用ボトル１０（実施例）内を陽圧とし、徐々にその内圧を高めていき、この際の耐圧用ボトル１０の全高変化量と、底部２０の底深さ（すなわち各脚部２１の接地面２１ａと底部２０の中央部２０ａとの間の距離）の変化量とを測定した。ここで、全高変化量とは、内圧が０ｋＰａのときの耐圧用ボトル１０の全高に対する、耐圧用ボトル１０の全高の変化量をいう。また、底深さの変化量とは、内圧が０ｋＰａのときの底部２０の底深さに対する、底部２０の底深さの変化量をいう。この結果を図６および図７に示す。   Next, the inside of the pressure-resistant bottle 10 (example) is set to a positive pressure, and the internal pressure is gradually increased, and the total amount of change in the pressure-resistant bottle 10 and the bottom depth of the bottom portion 20 (that is, each leg portion). 21) and the amount of change in the distance between the ground contact surface 21a and the center portion 20a of the bottom portion 20 was measured. Here, the total height change amount refers to a change amount of the total height of the pressure-resistant bottle 10 with respect to the total height of the pressure-resistant bottle 10 when the internal pressure is 0 kPa. The amount of change in the bottom depth refers to the amount of change in the bottom depth of the bottom portion 20 with respect to the bottom depth of the bottom portion 20 when the internal pressure is 0 kPa. The results are shown in FIG. 6 and FIG.

この結果、本実施例による耐圧用ボトル１０は、内圧が増加するに従って、その全高が増加していき（図７）、かつ底部２０の底深さが減少していったが（図６）、内圧が約１２０〜１３０ｋＰａとなるまでバックリングすることなく耐えることができた。   As a result, the pressure-resistant bottle 10 according to the present example increased in overall height as the internal pressure increased (FIG. 7), and the bottom depth of the bottom 20 decreased (FIG. 6). It could withstand without buckling until the internal pressure reached about 120 to 130 kPa.

一方、比較例として、図８に示すボトル１００（比較例１）と、図９に示すボトル１００（比較例２）とをそれぞれ作製した。この場合、上述した耐圧用ボトル１０（実施例）の場合と同様に、それぞれ１８ｇのプリフォームを二軸延伸ブロー成形することにより、ボトル１００（比較例１）およびボトル１００（比較例２）を作製した。なお、これら３種類のボトルの相違点は底部形状のみであり、他の部分（口部、胴部等）の形状は同一であった。   On the other hand, as a comparative example, a bottle 100 (Comparative Example 1) shown in FIG. 8 and a bottle 100 (Comparative Example 2) shown in FIG. 9 were respectively produced. In this case, the bottle 100 (Comparative Example 1) and the bottle 100 (Comparative Example 2) are formed by biaxially stretch-blowing each 18 g preform, as in the case of the pressure-resistant bottle 10 (Example) described above. Produced. The difference between these three types of bottles is only the bottom shape, and the other portions (mouth, trunk, etc.) have the same shape.

次に、これら３種類のボトル内を陽圧とし、徐々にその内圧を高めていき、このときの各ボトルの全高変化量を測定した。

Figure 2010241477
Next, the inside of these three types of bottles was set to a positive pressure, and the internal pressure was gradually increased, and the total height change amount of each bottle at this time was measured.
Figure 2010241477

この結果、ボトル内圧を４０ｋＰａとした場合、図８に示すボトル１００（比較例１）の全高変化量が最も大きくなり（１．８ｍｍ）、図９に示すボトル１００（比較例２）の全高変化量がその次に大きくなった（１．１ｍｍ）。他方、図１に示す耐圧用ボトル１０（実施例）の全高変化量は、これら３種類のボトルのうち、最も小さく抑えられた（０．４ｍｍ）。   As a result, when the bottle internal pressure is 40 kPa, the total height change amount of the bottle 100 (Comparative Example 1) shown in FIG. 8 is the largest (1.8 mm), and the total height change of the bottle 100 (Comparative Example 2) shown in FIG. The amount then increased (1.1 mm). On the other hand, the total amount of change in the pressure-resistant bottle 10 (Example) shown in FIG. 1 was minimized (0.4 mm) among these three types of bottles.

次に、ボトル内圧を６０ｋＰａとした場合、図８に示すボトル１００（比較例１）および図９に示すボトル１００（比較例２）は、それぞれの底部にバックリングが生じてしまった。他方、図１に示す耐圧用ボトル１０（実施例）は、その底部にバックリングが生じることがなく、耐えることができた。この場合、耐圧用ボトル１０（実施例）の全高変化量は０．７ｍｍであった。   Next, when the bottle internal pressure was set to 60 kPa, buckling occurred at the bottoms of the bottle 100 (Comparative Example 1) shown in FIG. 8 and the bottle 100 (Comparative Example 2) shown in FIG. On the other hand, the pressure-resistant bottle 10 (Example) shown in FIG. 1 was able to withstand without buckling occurring at the bottom. In this case, the total height change amount of the pressure-resistant bottle 10 (Example) was 0.7 mm.

１０ 耐圧用ボトル
１１ 口部
１２ 胴部
２０ 底部
２０ａ 中央部
２０ｂ 周縁部
２１ 脚部
２１ａ 接地面
２１ｂ 内側傾斜面
２１ｃ 外側傾斜面
２１ｄ 周縁部
２２ 平坦面
２２ａ 周縁部
２４ 凹部
２６ 周縁段部 DESCRIPTION OF SYMBOLS 10 Pressure-resistant bottle 11 Mouth part 12 Body part 20 Bottom part 20a Center part 20b Peripheral part 21 Leg part 21a Grounding surface 21b Inner inclined surface 21c Outer inclined surface 21d Peripheral part 22 Flat surface 22a Peripheral part 24 Concave part 26 Peripheral step part

Claims (5)

耐圧用ボトルにおいて、
口部と、
胴部と、
底部とを備え、
底部は、中央部から周縁部に延びるとともに下方へ突出する複数の脚部を有し、各脚部間に中央部から周縁部に向かって上方へ延びる平坦面が形成され、
各脚部の周縁部は、胴部から半径方向内方に引っ込んで各平坦面の周縁部とともに周縁段部を形成することを特徴とする耐圧用ボトル。 In pressure-resistant bottles,
The mouth,
The torso,
With a bottom,
The bottom portion has a plurality of legs that extend from the central portion to the peripheral portion and project downward, and a flat surface that extends upward from the central portion toward the peripheral portion is formed between the leg portions.
The pressure-resistant bottle, wherein the peripheral portion of each leg portion is retracted radially inward from the trunk portion to form a peripheral step portion together with the peripheral portion of each flat surface. 各平坦面は、中央部から周縁部に向かう断面において下方へ向けて湾曲するドーム状曲面の一部を構成することを特徴とする請求項１記載の耐圧用ボトル。   2. The pressure-resistant bottle according to claim 1, wherein each flat surface constitutes a part of a dome-shaped curved surface that curves downward in a cross section from the central portion toward the peripheral portion. 底部は、奇数個の脚部を有することを特徴とする請求項１または２記載の耐圧用ボトル。   The pressure-resistant bottle according to claim 1 or 2, wherein the bottom has an odd number of legs. 各脚部の突出高さが胴部の径の１０％〜２０％であることを特徴とする請求項１乃至３のいずれか一項記載の耐圧用ボトル。   The pressure-proof bottle according to any one of claims 1 to 3, wherein a protruding height of each leg portion is 10% to 20% of a diameter of the trunk portion. 底部の中央部に上方へ引っ込む凹部が形成されていることを特徴とする請求項１乃至４のいずれか一項記載の耐圧用ボトル。   The pressure-resistant bottle according to any one of claims 1 to 4, wherein a concave portion that is recessed upward is formed in a central portion of the bottom portion.
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JP2012162287A (en) * 2011-02-04 2012-08-30 Dainippon Printing Co Ltd Plastic bottle
JP2012162290A (en) * 2011-02-04 2012-08-30 Dainippon Printing Co Ltd Plastic bottle

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012162287A (en) * 2011-02-04 2012-08-30 Dainippon Printing Co Ltd Plastic bottle
JP2012162290A (en) * 2011-02-04 2012-08-30 Dainippon Printing Co Ltd Plastic bottle

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