JP5321814B2 - Packaging container with spiral vacuum absorption panel - Google Patents

Packaging container with spiral vacuum absorption panel Download PDF

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JP5321814B2
JP5321814B2 JP2009061275A JP2009061275A JP5321814B2 JP 5321814 B2 JP5321814 B2 JP 5321814B2 JP 2009061275 A JP2009061275 A JP 2009061275A JP 2009061275 A JP2009061275 A JP 2009061275A JP 5321814 B2 JP5321814 B2 JP 5321814B2
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panel
column
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JP2010215242A (en
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正樹 三浦
高規 岡部
由佳 小笠原
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Toyo Seikan Kaisha Ltd
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Description

本発明は各種飲用の容器として用いられる合成樹脂製の瓶体の構造に関する。   The present invention relates to the structure of a synthetic resin bottle used as various drinking containers.

各種飲用の容器として、ポリエチレンテレフタレート（以下ＰＥＴと記す。）樹脂製等の合成樹脂製壜体は、各種飲料用の容器として現在広く利用されているところである。この種の壜体では材料コスト低減のために胴壁の薄肉化が求められるが、それに伴う壜体としての剛性と強度の低下を十分に防止し、また壜体内の圧力変動による胴壁の変形をいかに吸収するかが壜体の形状設計における大きな課題となっている。   Synthetic resin casings such as polyethylene terephthalate (hereinafter referred to as PET) resin are widely used as containers for various beverages. In this type of housing, it is required to reduce the wall thickness in order to reduce material costs, but the rigidity and strength of the housing as a result are sufficiently prevented, and deformation of the body wall due to pressure fluctuations in the housing. How to absorb water is a big problem in the shape design of the frame.

その課題を解決するものとして複数の螺旋パネル(傾斜パネルとも呼ばれる。)を周方向に設けた螺旋パネル型プラスチックボトルが知られている（例えば、特許文献１参照）。果汁飲料、ウーロン茶、コーヒ、紅茶等の飲料の充填・密封後に生じるプラスチックボトル内の減圧は、上記螺旋パネルの径方向内方への変形及び周方向への捻れ変形と、上記螺旋パネル間の傾斜柱部の周方向へ捻れ変形によって効果的に減圧吸収される。しかし、この複数の螺旋パネルを周方向に設けた螺旋型プラスチックボトルは図１における従来例に模式的に示すように、減圧度が大きくなると捻じり状の縮径変形に際して、略平行四辺形形状となる上記螺旋パネルにおいて長対角線方向に引張り力が作用し、傾斜パネルの角部に大きな応力集中が起こる。その結果、角部において柱の陥没や座屈などの変形を生じやすいという問題があった。   As a solution to this problem, a spiral panel type plastic bottle provided with a plurality of spiral panels (also referred to as inclined panels) in the circumferential direction is known (for example, see Patent Document 1). Depressurization in plastic bottles after filling and sealing beverages such as fruit juice, oolong tea, coffee, black tea, etc. is due to the deformation of the spiral panel in the radial direction and the twist in the circumferential direction, and the inclination between the spiral panels. It is effectively absorbed under reduced pressure by twisting deformation in the circumferential direction of the column portion. However, the spiral plastic bottle provided with a plurality of spiral panels in the circumferential direction, as schematically shown in the conventional example in FIG. In the spiral panel, a tensile force acts in the long diagonal direction, and a large stress concentration occurs at the corner of the inclined panel. As a result, there is a problem that deformation such as column depression or buckling is likely to occur at the corners.

特許文献２には、上記の問題、すなわち、傾斜パネルと柱部で減圧吸収機能部分を構成する丸型ボトルにおけるこの捻れ変形に伴う柱部を含む傾斜パネルの周縁の壁部が局部的に座屈変形と、形状復元ができなくなるという問題に着目し、この問題を解決してより大きな減圧強度を有する合成樹脂製丸型ボトルを提供することが提示されている。この発明は図５に示されるように、円筒形状をした胴部に、複数の一定方向に傾斜した傾斜パネルを周囲を段部で囲うようにして、陥没状に周方向に並列形成すること、隣接する傾斜パネル間を傾斜した柱部とすること、傾斜パネルの、上下計４ケの角部の中の少なくとも応力が集中する鋭角の角部において段部の基端部に隣接させて凹溝を形成することを提案している。この凹溝を形成することにより、応力集中する角部近傍における柱部を含む周縁壁部の局部的な座屈変形をより効果的に抑制することができるとしている。しかし、この発明は凹溝によって変形が抑制される反面、本来の捻れ変形による減圧吸収効果が減少されてしまうという欠点がある。   In Patent Document 2, the above-mentioned problem, that is, the peripheral wall portion of the inclined panel including the column portion accompanying the torsional deformation in the round bottle constituting the reduced pressure absorption function portion by the inclined panel and the column portion is locally seated. Focusing on the problem of bending deformation and the inability to restore the shape, it has been proposed to solve this problem and provide a round bottle made of synthetic resin having a greater decompression strength. As shown in FIG. 5, the present invention forms a plurality of inclined panels inclined in a certain direction in a cylindrical body portion so as to be surrounded by a stepped portion, and is formed in parallel in the circumferential direction in a depressed shape. An inclined column between adjacent inclined panels is formed, and a concave groove is formed adjacent to the base end of the stepped portion at an acute angle corner where stress is concentrated in at least four corner portions of the inclined panel. Propose to form. By forming this concave groove, local buckling deformation of the peripheral wall portion including the column portion in the vicinity of the corner portion where stress is concentrated can be more effectively suppressed. However, the present invention suppresses deformation by the concave grooves, but has a drawback that the reduced pressure absorption effect due to the original torsional deformation is reduced.

特許文献２の発明は応力が集中する箇所の強度を単に補強しようという思想であるため、そもそもの減圧吸収機能を低下させてしまう問題が生じた。変形の原因となっている応力集中を避けること、すなわち応力を分散させる手法を取り入れて、柱部の陥没や座屈を効果的に防止することができないかと研究が進められた。
本発明の課題は、複数の螺旋パネルを周方向に設けた螺旋型プラスチックボトルにおいて、減圧吸収の際に生じる応力を分散させると共に、圧力が集中する部分の強度を減圧吸収機能を低下させないように補強して柱部の陥没や座屈を効果的に防止できる螺旋型プラスチックボトルを提供することにある。 Since the invention of Patent Document 2 is based on the idea of simply reinforcing the strength of the portion where the stress is concentrated, the problem of lowering the reduced pressure absorption function has occurred. Research has been conducted on whether it is possible to effectively prevent the collapse and buckling of the column by avoiding the stress concentration that causes the deformation, that is, the method of dispersing the stress.
An object of the present invention is to disperse the stress generated during vacuum absorption in a spiral plastic bottle provided with a plurality of spiral panels in the circumferential direction, and to prevent the pressure-absorbing function from degrading the strength of the portion where pressure is concentrated. An object of the present invention is to provide a spiral plastic bottle that can be reinforced to effectively prevent the depression and buckling of a column portion.

本発明の胴部に螺旋状減圧吸収パネルを備えた包装用容器は、胴部に螺旋状の減圧吸収パネルを備えた包装用容器であって、前記螺旋パネル本体両脇の柱部の幅が、高さ略中央で最小であり、上下に行くに従って連続的に広がる形状とし、前記螺旋パネル本体及び柱部の横断面が、容器内方に向かって凸状に湾曲し、螺旋パネル本体の幅は高さ中央で最大となるものとし、螺旋パネル本体の横断面の曲率半径が該螺旋パネル高さ略中央断面で最大となり、上下に行くに従って曲率半径を小さくすることで螺旋パネルの深さの差が小さくなるように形成されたことを特徴とする。
また、本発明の螺旋状減圧吸収パネルを備えた包装用容器は、胴部の上下少なくとも一方に環状部と、この環状部と螺旋パネルとを接続する斜面とが備わっており、この斜面と螺旋パネルとが接触する境界稜線が螺旋パネル本体の高さ中央に向かって凸状に湾曲していることを特徴とする。
また、本発明の螺旋状減圧吸収パネルを備えた包装用容器は、上下少なくとも一方環状部と螺旋パネル本体との境界近傍の横断面において螺旋パネル本体の幅と柱部の幅とが略等しい略正多角形状となるように形成した。 The packaging container provided with the helical vacuum absorption panel in the trunk portion of the present invention is a packaging container provided with the helical vacuum absorption panel in the trunk portion, and the width of the pillar portions on both sides of the spiral panel main body is The width of the spiral panel body is the smallest at the center of the height, and has a shape that continuously expands as it goes up and down, and the cross section of the spiral panel body and the column is curved convexly toward the inside of the container. Is the maximum at the center of the height, the radius of curvature of the cross section of the spiral panel body is the maximum at the center of the spiral panel height, and the radius of curvature of the spiral panel is reduced by decreasing the radius of curvature as it goes up and down. It is characterized in that the difference is formed to be small .
Further, the packaging container provided with the helical vacuum absorption panel of the present invention is provided with an annular portion on at least one of the upper and lower sides of the trunk portion, and a slope connecting the annular portion and the spiral panel. The boundary ridgeline in contact with the panel is curved in a convex shape toward the height center of the spiral panel body.
Further, the packaging container provided with the spiral vacuum absorption panel of the present invention is substantially the same in the cross section in the vicinity of the boundary between at least one of the upper and lower annular portions and the spiral panel body. It formed so that it might become a regular polygon shape.

本発明の螺旋型プラスチックボトルは、螺旋パネル本体両脇の柱部の幅が、高さ略中央で最小であり、上下に行くに従って連続的に広がる形状となっているため、軸荷重や横からの荷重によって座屈しやすい柱部の上端および下端が、柱部の中央近傍から連続的に太くなることで荷重に対する支え強度が増す。また、減圧吸収が進むに従って柱部の上下端部付近の左右両側の稜線がその輪郭に沿って曲がりやすくなることで柱部の稜線による輪郭がいっそう際だち柱強度が増していく。また、螺旋パネル本体及び柱部の横断面が容器内方に向かって凸状に湾曲していることにより、減圧強度に優れた容器となる。また、螺旋パネル本体と斜面との境界稜線が、螺旋パネル本体の高さ中央に向かって凸状に湾曲しているので、減圧変形の際、この境界稜線の先端頂部によってパネルが安定して撓み曲がる。また、柱部の左右両側から分散して応力が掛かりやすくなっていることで減圧吸収が進んでも柱部が折れたり、陥没しにくくなるという効果を奏する。
さらに、上下の環状部と、螺旋パネル本体および柱部との境界近傍においてパネル幅と柱幅とが略等しい略正多角形状となるように形成したので、この境界近傍の横断面形状はパネル数の２倍の辺の数を備え真円に近づいた略正多角形状となるため、自動販売機内での転がり性を従来の螺旋ボトルと比べて向上させることが出来る。 In the spiral plastic bottle of the present invention, the width of the column part on both sides of the spiral panel body is the smallest at the center of the height, and has a shape that continuously spreads as it goes up and down. Since the upper end and lower end of the column part that is easily buckled by the load of the column are continuously thickened from the vicinity of the center of the column part, the supporting strength against the load increases. Further, as the decompression absorption proceeds, the ridge lines on both the left and right sides near the upper and lower end portions of the column portion are easily bent along the contour, so that the contour by the ridge line of the column portion further increases and the column strength further increases. Moreover, it becomes a container excellent in decompression intensity | strength because the cross section of a spiral panel main body and a pillar part is curving convexly toward the container inner side. In addition, since the boundary ridge line between the spiral panel body and the slope is convexly curved toward the center of the height of the spiral panel body, the panel is stably bent by the top of the boundary ridge line at the time of decompression deformation. Bend. Further, since the stress is easily applied by being dispersed from both the left and right sides of the column part, the column part is not easily broken or depressed even if the absorption under reduced pressure proceeds.
Furthermore, since the panel width and the column width are substantially equal in the vicinity of the boundary between the upper and lower annular portions and the spiral panel body and the column portion, the cross-sectional shape in the vicinity of this boundary is the number of panels. Therefore, it is possible to improve the rolling property in the vending machine as compared with the conventional spiral bottle.

また、本発明の螺旋型プラスチックボトルは、減圧吸収パネル部の横断面は、容器内方へ湾曲する凹状曲線であって、その曲率半径がパネル高さ略中央での横断面で曲率半径は最大となり、上下に行くに従って曲率半径が小さくなることで螺旋パネルの深さの差が小さくなるように形成したものであるから、減圧吸収パネル部は、凹状曲線の底部（図１の太線谷部）を中心にして柱部へ逸れることなく撓み曲がる減圧吸収動作をパネルの上下に渡りスムーズに進めることが出来る。また、同一曲率半径のパネル設計に比べてパネル部の上方および下方の域でパネルの容器外方への反転に対する抗力が増す。   Further, in the helical plastic bottle of the present invention, the transverse cross section of the vacuum absorbing panel portion is a concave curve that curves inward of the container, and the radius of curvature is the transverse cross section at the approximate center of the panel height, and the radius of curvature is maximum. Since the radius of curvature decreases as it goes up and down, the difference in the depth of the spiral panel is reduced, so the reduced pressure absorption panel part is the bottom of the concave curve (thick line valley part in FIG. 1). It is possible to smoothly perform the decompression absorption operation that bends and bends without deviating to the pillar portion around the top and bottom of the panel. Further, the resistance against the inversion of the panel to the outside of the container is increased in the region above and below the panel portion as compared with the panel design having the same curvature radius.

本発明の螺旋型プラスチックボトルと従来型ボトルとの減圧吸収時の応力形態を対比した図である。It is the figure which contrasted the stress form at the time of the vacuum absorption of the spiral type plastic bottle of this invention, and a conventional type bottle. 本発明の螺旋型プラスチックボトル形状を説明する図である。It is a figure explaining the spiral plastic bottle shape of this invention. 本発明の減圧吸収パネル形状を展開図で示したものである。The reduced pressure absorption panel shape of this invention is shown with the expanded view. 異なる本発明の螺旋型プラスチックボトルの形状を示した図である。It is the figure which showed the shape of the different spiral type plastic bottle of this invention. 減圧吸収時の応力形態を考慮した従来の螺旋型プラスチックボトル形状を示した図である。It is the figure which showed the conventional spiral plastic bottle shape in consideration of the stress form at the time of vacuum absorption.

以下、本発明の実施の形態について、図２と図３を参照しながら詳細に説明する。この螺旋型プラスチックボトル１の特徴点はボトル胴部の減圧吸収パネルの形状にある。２は螺旋パネル本体、３はパネルの柱部、４は胴部の上下端に設けられた環状部、５は該環状部４と胴部との境界に設けられた円錐台の側面状の斜面である。この実施形態例の螺旋型プラスチックボトルの材料としては、熱可塑性樹脂であれば種類や、単層，多層，ブレンドなど特に問わないが、ポリエステル樹脂であって飲料容器によく用いられるＰＥＴの単層が好ましい。この螺旋型プラスチックボトルには７つの螺旋パネル本体２が周方向に設けられている。螺旋パネル本体２同士の間に設けられた柱部３は、柱部３の高さ略中央の箇所で幅が最小になるようにし、中央の横断面［水平断面であって図２におけるＢ−Ｂ断面（切断部形状）］もしくはその近傍の横断面での柱部切断切り口幅も最小となっており、上下に行くに従って連続的に広がる形状としている。
これが本発明の第１の特徴点である。また、螺旋パネル本体２及び柱部３の横断面は容器内方に向かって凸状に湾曲しており、この実施形態例では、円弧状に湾曲している。さらに、環状部４と減圧吸収パネルとの境界近傍［Ａ−Ａ断面（切断部形状）およびＣ−Ｃ断面（切断部形状）］で柱部３と螺旋パネル本体２の幅がほぼ同一となっている。 Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 2 and 3. FIG. The feature of this spiral plastic bottle 1 is the shape of the vacuum absorption panel in the bottle body. 2 is a spiral panel body, 3 is a column part of the panel, 4 is an annular part provided at the upper and lower ends of the body part, and 5 is a side-like slope of a truncated cone provided at the boundary between the annular part 4 and the body part It is. The material of the spiral plastic bottle of this embodiment is not particularly limited as long as it is a thermoplastic resin, and the type, single layer, multilayer, blend, etc. are not particularly limited, but it is a polyester resin and is a PET single layer often used in beverage containers Is preferred. The spiral plastic body is provided with seven spiral panel bodies 2 in the circumferential direction. The column portion 3 provided between the spiral panel main bodies 2 has a minimum width at a position approximately at the center of the column portion 3, and has a horizontal cross section [horizontal cross section, B- in FIG. B cross section (cut section shape)] or the width of the column section cut at the cross section in the vicinity thereof is also the smallest, and the shape continuously spreads up and down.
This is the first characteristic point of the present invention. Moreover, the cross section of the spiral panel main body 2 and the column part 3 is curving convexly toward the inner side of the container, and in this embodiment, it is curving in an arc shape. Further, in the vicinity of the boundary between the annular portion 4 and the reduced pressure absorption panel [A-A cross section (cut portion shape) and CC cross section (cut portion shape)], the width of the column portion 3 and the spiral panel body 2 are substantially the same. ing.

上記の構造を採用したことにより、軸荷重や横からの荷重によって座屈しやすい柱部の上端および下端が中央近傍から連続的に太くなり応力集中が緩和され荷重に対する支え強度が増す。また、従来の螺旋パネルの柱部では、上下に渡って一定幅の柱部が上下端部で急激に円弧状曲線等にて広げられているので減圧吸収変形時、上下端部の柱稜線は無理に曲げられ座屈的に変形しやすいが、本発明の形態では柱部３の幅が中央で細く、上下端部に行くに従って次第に連続的に太くなっている構造のため、柱部３の上下端部付近の左右両側は減圧吸収が進むに従って稜線の輪郭に沿って撓み曲がりやすくなっている。この部分は図１に示すように減圧吸収時の応力集中箇所になっているが、この変形により柱部３の稜線による輪郭がいっそう際だち柱の強度が増していくため、その応力に十分耐えることができるのである。また柱部３の左右両側から力が掛かるという現象は、図１の従来例に示すような柱部の片側からのみ応力集中することなく、応力が分散されることを意味しており、減圧吸収が進んでも柱部が折れたり、陥没しにくくなる作用効果を生じるのである。さらに、螺旋パネル本体２及び柱部３の横断面が容器内方に向かって凸状に湾曲しているため、螺旋パネル本体２だけでなく柱部３も減圧吸収変形しやすくなっており、さらに両者をつなぐ稜線も際だつので強度的にも優れている。   By adopting the above structure, the upper end and the lower end of the column part that is easily buckled by axial load or lateral load are continuously thickened from the vicinity of the center, the stress concentration is relaxed, and the support strength against the load is increased. In addition, in the column part of the conventional spiral panel, the column part of the fixed width across the top and bottom is abruptly widened with an arcuate curve etc. at the upper and lower end parts. Although it is forcibly bent and easily deformed in a buckling manner, in the embodiment of the present invention, the width of the column portion 3 is narrow at the center and gradually becomes thicker toward the upper and lower end portions. The left and right sides near the upper and lower end portions are easily bent and bent along the contour of the ridgeline as the absorption of reduced pressure proceeds. As shown in FIG. 1, this portion is a stress concentration portion at the time of absorbing the reduced pressure. However, this deformation increases the strength of the column due to the contour of the ridge line of the column portion 3, and the stress is sufficient. It can endure. Further, the phenomenon that force is applied from both the left and right sides of the column part 3 means that stress is dispersed without concentration of stress only from one side of the column part as shown in the conventional example of FIG. Even if it progresses, the column part is broken, and an effect that makes it difficult to sink is produced. Further, since the cross sections of the spiral panel body 2 and the column part 3 are convexly curved toward the inside of the container, not only the spiral panel body 2 but also the column part 3 is easily subjected to reduced pressure absorption deformation. The ridgeline connecting the two is also outstanding, so it is excellent in strength.

本発明に係るボトル形状の第２の特徴点は、上下の環状部４と、螺旋パネル本体および柱部との境界部の形状にある。図１の従来例では、螺旋パネル本体の上端または下端は水平になっており、その左右両端がＲで丸められている。これに対し、本発明では上下の環状部と、螺旋パネル本体２および柱部３との境界に斜面５が設けられ、螺旋パネル本体２と斜面５との境界は略円弧状（厳密には楕円に近い形状）で螺旋パネル本体の高さ中央に向かって凸状に湾曲した境界稜線が備わっており、この略円弧状境界稜線の先端頂部（；最もＢ−Ｂ断面の切断位置に近い箇所）が螺旋パネル本体２の谷部に連結される構造となっている。したがって、捻れ変形によって減圧吸収が行われる際、螺旋パネル本体２の谷部は上下の略円弧状境界稜線の先端頂部によっても谷部の位置決めされているので、減圧が進むにつれて螺旋パネル本体２が谷部に沿ってしっかりと撓み曲げられていく。先の柱部３の構造とこの位置決めされた谷部によって、捻れ変形による減圧吸収が安定して行われることとなる。   The 2nd feature point of the bottle shape which concerns on this invention exists in the shape of the boundary part of the upper and lower cyclic | annular part 4, and a spiral panel main body and a column part. In the conventional example of FIG. 1, the upper end or lower end of the spiral panel body is horizontal, and its left and right ends are rounded with R. On the other hand, in the present invention, an inclined surface 5 is provided at the boundary between the upper and lower annular portions and the spiral panel body 2 and the column portion 3, and the boundary between the spiral panel body 2 and the inclined surface 5 is substantially arcuate (strictly speaking, an elliptical shape). The shape is close to the height of the spiral panel body, and has a boundary ridge line curved in a convex shape toward the center of the height of the spiral panel body, and the top end of the substantially arc-shaped boundary ridge line (the place closest to the cutting position of the BB cross section) Is connected to the valley of the spiral panel body 2. Therefore, when vacuum absorption is performed by torsional deformation, the valley of the spiral panel body 2 is positioned by the tops of the upper and lower substantially arc-shaped boundary ridge lines. It bends and bends firmly along the valley. By the structure of the previous pillar portion 3 and the positioned valley portion, the reduced pressure absorption due to torsional deformation is stably performed.

また、本実施形態例では上記の斜面５から螺旋パネル本体２に連結される略円弧状の境界稜線と同じ形態で斜面５と柱部３との境界にも円弧状に湾曲した境界稜線を形成するものとした。そして、その周方向の幅は螺旋パネル本体２と同じとし、螺旋パネル本体２および柱部３と、環状部４との境界稜線部はパネル数の２倍の数の辺と頂点を備えた略正多角形状となるように形成されるものとした。
図１の従来例のような柱部とパネル部の形状が採られるとボトルの中央断面位置からパネル上下端までの横断面形状はおおよそパネル数と同一の辺の数で、柱部を略頂点とした、円形にはほど遠い略正多角形状（正八角形）となるため、ボトルが自動販売機内に装填され転がる際、自動販売機のガイド板などにボトルの最外径部（本発明の環状部４に相当する箇所）の他に柱部上端近傍または下端部近傍も当たって転がり性が悪くなってしまうという問題があるが、本発明の構造を採用すれば上下の柱幅を広くすることで少なくともパネルの上下端部近傍の横断面形状はパネルの数の２倍に相当する辺の数を備え、螺旋パネル本体２と柱部３との境（稜線）がほぼ等間隔に配置される頂点とした略正多角形状（辺の形はいびつの、略正１４角形）とすることが出来るため、形状がより真円に近づくこととなり、ベンダー内での転がり性を従来型の螺旋ボトルと比べて向上させることが出来る。また、柱幅は前述の通り連続的に徐々に変化しているので、柱部３の上下端部から少し離れた箇所でも略正多角形状に近い横断面形状であるため、転がり性をより向上させることが出来る。 In the present embodiment, a boundary ridge line curved in an arc shape is also formed at the boundary between the slope 5 and the column portion 3 in the same form as the substantially arc-shaped boundary ridge line connected to the spiral panel body 2 from the slope 5 described above. To do. The width in the circumferential direction is the same as that of the spiral panel body 2, and the boundary ridge line portion between the spiral panel body 2, the column portion 3, and the annular portion 4 is provided with sides and vertices that are twice the number of panels. It shall be formed so that it may become a regular polygon shape.
When the shape of the column part and the panel part as in the conventional example of FIG. 1 is adopted, the cross-sectional shape from the center cross-sectional position of the bottle to the upper and lower ends of the panel is approximately the same number of sides as the number of panels, and the pillar part is substantially apex. Since the regular polygonal shape (regular octagon) that is far from the circular shape is formed, when the bottle is loaded in the vending machine and rolled, the outermost diameter portion of the bottle (the annular portion of the present invention) is placed on the guide plate of the vending machine. 4) in addition to the vicinity of the upper end of the column part or the vicinity of the lower end part, there is a problem that the rolling property is deteriorated, but if the structure of the present invention is adopted, the vertical column width is widened. At least the cross-sectional shape in the vicinity of the upper and lower end portions of the panel has the number of sides corresponding to twice the number of panels, and the apexes at which the boundaries (ridge lines) between the spiral panel body 2 and the column portion 3 are arranged at almost equal intervals. Approximate regular polygonal shape (side shape is irregular, approximately regular 14 corners ) Because it can be made and the shape closer to a true circle, the rolling resistance in the vendor can be improved as compared with the conventional spiral bottle. In addition, since the column width changes gradually and continuously as described above, the rolling property is further improved because the cross-sectional shape is almost a regular polygonal shape even at a distance from the upper and lower ends of the column 3. It can be made.

また、本発明の螺旋型プラスチックボトルは、第３の特徴点としてパネル部の幅の変化に合わせ、減圧吸収パネル横断面の曲率半径を変化させるようにした。すなわち、減圧吸収パネル部の横断面の容器内方へ湾曲する略円弧状凹状曲面の曲率半径がパネル横断面幅の高さ方向の変化（；略中央が最長で、上下に行くのに従って短くなる）に合わせて変化し、中央断面で最大となり、上下に行くに従って曲率半径が小さくなることで螺旋パネル本体２の深さの差が中央部と上下端部とで小さくなるようにして上下でも減圧吸収パネルの横断面が円弧状である凹状曲線の底部深さを維持し、図１の本発明ボトルに描写された太線を中心にして柱部へ逸れることなく撓み曲がる減圧吸収動作をパネルの上から下に渡ってスムーズに進めることが出来る。また、同一曲率半径のパネル設計に比べて本発明の当該構成はパネル部の上方および下方のパネルの容器外方への反転に対する抗力が増すため、容器内に内圧（陽圧）が加わったときに対する膨らみを抑える事が出来、また容器が減圧して内部に陰圧がかかり、パネルが捻れ変形を起こす際にも、パネルの外方への反転膨出を抑えることが出来る効果をも奏する。   Further, the spiral plastic bottle of the present invention has a third feature point that the radius of curvature of the transverse cross section of the vacuum absorbing panel is changed in accordance with the change of the width of the panel portion. That is, the radius of curvature of the substantially arc-shaped concave curved surface that curves inward in the container of the transverse cross section of the reduced pressure absorption panel portion is the change in the height direction of the panel transverse section width (; the center is the longest, and becomes shorter as it goes up and down. ), The maximum in the central cross section, and the radius of curvature decreases as it goes up and down, so that the difference in depth of the spiral panel body 2 is reduced between the center and the upper and lower ends, and the pressure is reduced both vertically Maintaining the depth of the bottom of the concave curve whose cross section is circular in shape, the vacuum absorption operation that bends and deflects around the thick line depicted in the bottle of the present invention in FIG. Can proceed smoothly from the bottom to the bottom. In addition, when compared to a panel design with the same radius of curvature, the present configuration of the present invention increases the resistance against the inversion of the panel above and below the panel to the outside of the container, so that when an internal pressure (positive pressure) is applied in the container In addition, when the container is decompressed and a negative pressure is applied to the inside thereof, and the panel is twisted and deformed, the panel can be prevented from bulging outward.

図２に示した数値により、本発明の１実施例を説明する。この螺旋型プラスチックボトル１は、素材にＰＥＴが使用され、図３に展開図で示されるように７つの螺旋パネル本体２が周方向に設けられている。プラスチックボトル１の肩部に直径６７．５ｍｍの上側環状部４が、底部から１／８程の位置に直径６７．５ｍｍの下側環状部４が設けられ、その間の胴部に螺旋型減圧吸収パネル部が形成されている。ボトル１の中央部Ｂ−Ｂ断面の位置では螺旋パネル本体２は円弧状の凹状曲線で、その曲率半径はＲ５２である。柱部３の頂面も円弧状の凹状曲線で、その曲率半径はパネル本体２と同じＲ５２である。１つの螺旋パネル幅のなす角は４７°、螺旋柱幅のなす角は約４．４３°（１組のパネルと柱部のなす角が３６０°÷７組≒５１．４３°）、螺旋パネル本体２の水平幅は直線距離で２６．９ｍｍそして柱部３の水平幅は直線距離で２．６ｍｍである。上側環状部４と螺旋パネルとの境界近傍のＡ−Ａ断面では螺旋パネル本体２も円弧状の凹状曲線で、その曲率半径はＲ４２、柱部３も円弧状の凹状曲線で、その頂面の曲率半径はＲ５２、１つの螺旋パネル幅および螺旋柱幅のなす角はそれぞれ３６０°÷（７パネル面＋７柱部）≒２５．７１°、螺旋パネル本体２の水平幅は直線距離で１５ｍｍそして柱部３の水平幅も直線距離で１５ｍｍである。図２に示すようにＡ−Ａ断面形状は、辺の湾曲度合いはパネルと柱の曲率半径の差により互い違いに異なるが、辺の水平幅（直線距離）が等しく、頂点の配置が等間隔の略正１４角形状で真円に近い形状となっている。また、下側環状部４と螺旋パネルとの境界位置のＣ−Ｃ断面はＡ−Ａ断面と同形状である。また、螺旋パネル本体２の谷部に連結される略円弧状の境界稜線は（厳密には楕円状であるが）、曲率半径で表すとおおよそ１２ｍｍ、そして環状部４と柱部３との境界の略円弧状の境界稜線は（厳密には楕円状であるが）、の曲率半径で表すとおおよそ１５ｍｍとなっている。
なお、本発明の実施は主旨を逸脱しない範囲で変更可能である。柱部３の幅が最小になる箇所は、柱部の高さ１／３〜２／３の範囲であれば、高さ中央から外れていてもよい。また、環状部４は上または下の一方だけにあってもよいし、図４のように両側略してもよい。また、図１〜３の本実施形態において環状部４の上また下に環状ビード（；環状溝）が設けられているが、この環状ビードを略してよい。斜面５も上または下の一方だけにあってもよいし、両側略してもよい。また、環状部４と螺旋パネル本体２との境界近傍の横断面において、上下両方とも略正多角形状となるのが好ましいが、上下どちらか一方が略正多角形状となっていてもよいし、両方とも略正多角形状となっていなくてもよい。また、図２におけるＡ−Ａ断面とＣ−Ｃ断面の形状は異なっていてもよい。さらに、螺旋パネル本体２の横断面、または斜面５との境界稜線は直線状、または、容器外方に凸状に湾曲してもよいが、好ましくは前述のように容器内方に向かって凸状に湾曲しているものがよい。その際、前述の円弧状の凹状曲線などに限らず、曲線状であれば略円弧状（前述の楕円弧状の他、放物線状など）でもよいし、これらに近い形であるＵ字状、Ｖ字状でもよい。 An embodiment of the present invention will be described with reference to the numerical values shown in FIG. This spiral plastic bottle 1 uses PET as a material, and has seven spiral panel bodies 2 provided in the circumferential direction as shown in a developed view in FIG. An upper annular portion 4 having a diameter of 67.5 mm is provided on the shoulder portion of the plastic bottle 1, and a lower annular portion 4 having a diameter of 67.5 mm is provided at a position about 1/8 from the bottom portion. A panel portion is formed. At the position of the cross section BB of the center portion of the bottle 1, the spiral panel body 2 is an arcuate concave curve, and its radius of curvature is R52. The top surface of the column part 3 is also an arcuate concave curve, and its radius of curvature is the same R52 as that of the panel body 2. The angle formed by one spiral panel width is 47 °, and the angle formed by the spiral column width is about 4.43 ° (the angle between one panel and the column is 360 ° ÷ 7 pairs≈51.43 °), the spiral panel The horizontal width of the main body 2 is 26.9 mm as a linear distance, and the horizontal width of the column part 3 is 2.6 mm as a linear distance. In the AA cross section near the boundary between the upper annular portion 4 and the spiral panel, the spiral panel body 2 is also an arc-shaped concave curve, the radius of curvature is R42, and the column portion 3 is also an arc-shaped concave curve. The radius of curvature is R52, the angle formed by one spiral panel width and the spiral column width is 360 ° ÷ (7 panel surface + 7 columns) ≈25.71 °, the horizontal width of the spiral panel body 2 is 15 mm in a linear distance, and the column The horizontal width of the part 3 is also a linear distance of 15 mm. As shown in FIG. 2, the AA cross-sectional shape is different in the degree of curvature of the sides due to the difference in the radius of curvature of the panel and the column, but the horizontal width (straight line distance) of the sides is equal, and the vertex arrangement is equally spaced. It is a substantially regular 14-corner shape that is close to a perfect circle. The CC cross section at the boundary position between the lower annular portion 4 and the spiral panel has the same shape as the AA cross section. In addition, the substantially arc-shaped boundary ridge line connected to the valley portion of the spiral panel body 2 (strictly elliptical) is approximately 12 mm in terms of the radius of curvature, and the boundary between the annular portion 4 and the column portion 3. The substantially arc-shaped boundary ridge line (which is strictly elliptical) is approximately 15 mm in terms of the radius of curvature.
The implementation of the present invention can be modified without departing from the spirit of the present invention. The portion where the width of the pillar portion 3 is minimized may be off the center of the height as long as the height of the pillar portion is in the range of 1/3 to 2/3. Further, the annular portion 4 may be provided only on one of the upper side and the lower side, or may be omitted on both sides as shown in FIG. Moreover, in this embodiment of FIGS. 1-3, although the annular bead (; annular groove) is provided above or below the annular part 4, this annular bead may be omitted. The slope 5 may be on only one of the upper side and the lower side, or may be omitted on both sides. Moreover, in the cross section in the vicinity of the boundary between the annular portion 4 and the spiral panel body 2, it is preferable that both the upper and lower sides have a substantially regular polygonal shape, but either the upper or lower side may have a substantially regular polygonal shape, Both do not need to be substantially regular polygonal shapes. Moreover, the shape of the AA cross section and CC cross section in FIG. 2 may differ. Further, the cross section of the spiral panel body 2 or the boundary ridge line with the inclined surface 5 may be curved in a straight line or convex outwardly of the container, but preferably protrudes inward of the container as described above. The one curved in a shape is good. In this case, the shape is not limited to the above-described arcuate concave curve, and may be a substantially arcuate shape (a parabola-like shape in addition to the above-described elliptical arc shape) as long as it is curvilinear, It may be letter-shaped.

本発明の減圧吸収パネルを備えた包装用容器は、常温充填飲料に用いてもよいが、その特性上、好ましくは高温充填による殺菌を必要とする飲料、たとえば果汁飲料、ウーロン茶、コーヒ、紅茶等の内容液を８５〜９５℃程度の高温で充填する所謂高温充填向け用途に使用が見込まれる。本発明の合成樹脂製包装用容器は、減圧吸収機能が十分に発揮され、横荷重に対する高剛性化、高強度化を樹脂量を増やすことなく達成したものであり、搬送ライン、積重保管、自販機等、横荷重に対する変形が問題となる場所で、安心して使用できる容器として幅広い用途展開が期待される。   The packaging container provided with the reduced pressure absorption panel of the present invention may be used for a room temperature filling beverage, but due to its characteristics, preferably a beverage requiring sterilization by high temperature filling, for example, fruit juice beverage, oolong tea, coffee, tea, etc. Is used for so-called high-temperature filling applications in which the content liquid is filled at a high temperature of about 85 to 95 ° C. The packaging container made of the synthetic resin of the present invention has a sufficiently low pressure absorption function, and achieves high rigidity against lateral load and high strength without increasing the amount of resin. A wide range of applications is expected as a container that can be used with peace of mind in places such as vending machines where deformation due to lateral load is a problem.

１ 螺旋型プラシチックボトル ２ 螺旋パネル本体
３ パネル柱部 ４ 環状部
５ 円弧状斜面 DESCRIPTION OF SYMBOLS 1 Spiral type plastic bottle 2 Spiral panel main body 3 Panel column part 4 Annular part 5 Arc-shaped slope

特開２０００−１４２６５４号公報 「プラスチックボトル」 平成１２年５月２３日公開JP 2000-142654 A “Plastic Bottle” Published May 23, 2000 特開２００７−２６９３５９号公報 「合成樹脂製丸形ボトル」 平成１９年１０月１８日公開JP 2007-269359 A “Synthetic Resin Round Bottle” Published on October 18, 2007

Claims (3)

胴部に螺旋状の減圧吸収パネルを備えた包装用容器であって、
前記螺旋パネル本体両脇の柱部の幅が、高さ略中央で最小であり、上下に行くに従って連続的に広がる形状とし、前記螺旋パネル本体及び柱部の横断面が、容器内方に向かって凸状に湾曲し、螺旋パネル本体の幅は高さ中央で最大となるものとし、螺旋パネル本体の横断面の曲率半径が該螺旋パネル高さ略中央断面で最大となり、上下に行くに従って曲率半径を小さくすることで螺旋パネルの深さの差が小さくなるように形成されたことを特徴とする、螺旋状減圧吸収パネルを備えた包装用容器。 A packaging container having a helical vacuum absorbing panel on the body,
The width of the column part on both sides of the spiral panel body is the smallest at the center of the height, and the width is continuously widened as it goes up and down, and the cross section of the spiral panel body and the column part is directed toward the inside of the container. The width of the spiral panel body is maximum at the center of the height, and the radius of curvature of the cross section of the spiral panel body is maximum at the center section of the spiral panel, and the curvature increases as it goes up and down. A packaging container provided with a spiral vacuum absorbing panel, wherein the difference in depth of the spiral panel is reduced by reducing the radius . 前記胴部の上下少なくとも一方には、環状部と、該環状部と胴部を接続する斜面とが備わっており、
該斜面と螺旋パネル本体とが接触する境界稜線が、螺旋パネル本体の高さ中央に向かって凸状に湾曲していることを特徴とする、請求項１に記載の螺旋状減圧吸収パネルを備えた包装用容器。 At least one of the upper and lower sides of the trunk part is provided with an annular part, and a slope connecting the annular part and the trunk part,
2. The spiral vacuum absorbing panel according to claim 1 , wherein a boundary ridgeline where the inclined surface and the spiral panel main body contact is curved in a convex shape toward the height center of the spiral panel main body. packaging container. 上下少なくとも一方の環状部と螺旋パネル本体との境界近傍の横断面において螺旋パネル本体の幅と柱部の幅とが略等しい略正多角形状となるように形成した請求項２に記載の螺旋状減圧吸収パネルを備えた包装用容器。 The spiral shape according to claim 2 , wherein the spiral panel body has a substantially regular polygonal shape in which a width of the spiral panel body and a width of the column part are substantially equal in a cross section in the vicinity of the boundary between the upper and lower annular portions and the spiral panel body. Packaging container with a vacuum absorbing panel.
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