JP5648955B2 - Synthetic resin housing - Google Patents

Synthetic resin housing Download PDF

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JP5648955B2
JP5648955B2 JP2010221755A JP2010221755A JP5648955B2 JP 5648955 B2 JP5648955 B2 JP 5648955B2 JP 2010221755 A JP2010221755 A JP 2010221755A JP 2010221755 A JP2010221755 A JP 2010221755A JP 5648955 B2 JP5648955 B2 JP 5648955B2
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synthetic resin
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stepped portion
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浩通 斉藤
浩通 斉藤
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Yoshino Kogyosho Co Ltd
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Description

本発明は、合成樹脂製壜体、特には積載時等における縦荷重に強く、容易に座屈変形することを防止した合成樹脂製壜体に関する。   The present invention relates to a synthetic resin casing, and more particularly to a synthetic resin casing that is resistant to a longitudinal load during loading and prevents buckling deformation easily.

従来より、ポリエチレンテレフタレート（以下ＰＥＴと記す。）樹脂製の二軸延伸ブロー成形壜体、所謂ＰＥＴボトルは、優れた透明性、機械強度、耐熱性、ガスバリア性等を有し、各種飲料用の容器として広く利用されている。   Conventionally, polyethylene terephthalate (hereinafter referred to as PET) resin biaxially stretched blow-molded casings, so-called PET bottles, have excellent transparency, mechanical strength, heat resistance, gas barrier properties, etc., and are used for various beverages. Widely used as a container.

また従来より、殺菌を必要とするたとえば果汁飲料、お茶等の内容液のＰＥＴボトルへの充填方法として、所謂、高温充填と呼ばれる方法があり、９０℃前後の温度で内容液を壜体に充填し、キャップをして密封後、冷却するものであり、壜体内がかなりの減圧状態となる。   Conventionally, there is a so-called high-temperature filling method for filling a PET bottle with content liquids such as fruit juices and teas that require sterilization, and the contents liquid is filled into the casing at a temperature of about 90 ° C. Then, the cap is sealed and then cooled, and the inside of the housing is in a considerably reduced pressure state.

このため、上記のような高温充填を伴う用途については、たとえば特許文献１中にあるように胴部に意図的に減圧により陥没状の変形が容易な領域である、所謂、減圧吸収パネルを形成して、減圧時にこの減圧吸収パネルを陥没状に変形させることにより、減圧吸収機能を発揮するようにしている。   For this reason, for applications involving high-temperature filling as described above, for example, as described in Patent Document 1, a so-called reduced-pressure absorption panel is formed, which is a region that can be easily deformed in a depressed state by depressurization intentionally in the trunk. Then, the vacuum absorbing function is exhibited by deforming the vacuum absorbing panel into a depressed shape during decompression.

ところで、内容液の充填工程などにおいては、搬送ラインを使用して壜体が搬送されるが、この搬送中に前後する壜体同士が衝突することがある。また自動販売機で販売される場合には、自動販売機内に横積みの状態で積層保管される上下の壜体同士が当接することがある。この際に胴部が形成された減圧吸収パネル同士の間で衝突又は当接が起きると、胴部が変形して減圧吸収パネルの減圧吸収機能が損なわれることがある。   By the way, in the step of filling the content liquid and the like, the casing is transported using the transport line, but the front and rear casings may collide with each other during the transport. In addition, when sold in a vending machine, the upper and lower housings stacked and stored in a horizontally stacked state in the vending machine may come into contact with each other. At this time, if a collision or abutment occurs between the reduced pressure absorption panels formed with the body portion, the body portion may be deformed and the reduced pressure absorption function of the reduced pressure absorption panel may be impaired.

一方、詰まりの問題から自動販売機用の壜体には最大外径寸法に厳しい制限がある。このため、壜体に充填される内容液の内容量の調整を行う場合には、最大外径寸法を維持しつつその他の部分の寸法を制御することにより行う必要がある。   On the other hand, there are severe restrictions on the maximum outer diameter of the vending machine housing due to clogging problems. For this reason, when adjusting the content volume of the content liquid filled in the casing, it is necessary to control the dimensions of the other portions while maintaining the maximum outer diameter dimension.

そこで、上記のような衝突又は当接が起きた場合の対策として、および壜体の最大外径寸法を維持しつつ内容量の調整を行う手段として、以下に示すような構造が採用されている。   Therefore, the following structure is adopted as a countermeasure when the above-described collision or contact occurs and as a means for adjusting the internal capacity while maintaining the maximum outer diameter of the housing. .

図３は従来の合成樹脂製壜体の一例を示す正面図、図４は壜体に形成された段差部の概略を部分的に拡大して示す断面図であり、Ａは変形前の状態、Ｂは座屈変形後の状態を示している。   FIG. 3 is a front view showing an example of a conventional synthetic resin casing, FIG. 4 is a cross-sectional view showing a partially enlarged outline of a step portion formed on the casing, and A is a state before deformation, B shows the state after buckling deformation.

この壜体１０１では、胴部１０４に意図的に減圧により陥没状の変形が容易な領域である、所謂、減圧吸収パネル１０８ａを形成して、減圧時にこの減圧吸収パネル１０８ａを陥没状に変形させることにより、良好な外観を保持するようにしている。   In this casing 101, a so-called reduced pressure absorption panel 108a, which is a region that can be easily deformed in a depressed state by depressurization, is formed in the body portion 104, and the reduced pressure absorption panel 108a is deformed into a depressed shape at the time of depressurization. Therefore, a good appearance is maintained.

またこの壜体１０１では、減圧吸収パネル１０８ａの両側に位置する上下の胴部１０４ｂ，１０４ｂの外径寸法を、自動販売機用として規定される最大外径寸法に設定し、成形時に減圧吸収パネル１０８ａが形成された中央の胴部１０４ａの外径寸法を、最大外径寸法以下の範囲内で制御することにより、充填される内容液が所定の内容量となるように調整される。   In this housing 101, the outer diameter of the upper and lower body portions 104b, 104b located on both sides of the reduced pressure absorption panel 108a is set to the maximum outer diameter defined for vending machines, and the reduced pressure absorption panel is formed during molding. The content liquid to be filled is adjusted to have a predetermined internal volume by controlling the outer diameter of the central barrel 104a formed with 108a within the range of the maximum outer diameter or less.

そして、常に上下の胴部１０４ｂ，１０４ｂの外径寸法の方が、中央の胴部１０４ａよりも大きな外径寸法となる構造を採用することにより、隣接する壜体１０１同士が衝突又は当接しても、上下の胴部１０４ｂ，１０４ｂ同士の間でのみ衝突が発生し、中央の胴部１０４ａ同士は直接的な衝突できないようにし、中央の胴部１０４ａの変形を防止して減圧吸収パネル１０８ａの減圧吸収機能が維持されるようにしている。   And by adopting a structure in which the outer diameter of the upper and lower body parts 104b, 104b is always larger than that of the central body part 104a, the adjacent casings 101 collide or come into contact with each other. However, a collision occurs only between the upper and lower body parts 104b and 104b, and the central body part 104a cannot be directly collided with each other. The vacuum absorption function is maintained.

特開２００５−８１５５号公報JP 2005-8155 A

このような壜体１０１は、垂直方向に積層された状態で保管及び運搬が行われるのが一般的であるが、壜体１０１に垂直方向（壜体の軸方向又は縦方向ともいう）に荷重（以下、縦荷重という）が加えられると、容易に座屈変形してしまうという問題がある。   Such a casing 101 is generally stored and transported in a state where it is stacked in the vertical direction. However, a load is applied to the casing 101 in a vertical direction (also referred to as an axial direction or a vertical direction of the casing). When a load (hereinafter referred to as a longitudinal load) is applied, there is a problem that it is easily buckled and deformed.

縦荷重による壜体１０１の座屈変形は、上下の胴部１０４ｂ，１０４ｂと中央の胴部１０４ａとの境目に形成された上下の段差部１０７，１０７において最も多発しやすい。段差部１０７は中央の胴部１０４ａや上下の胴部１０４ｂ，１０４ｂに比較して最も座屈強度の弱い部分であり、図４Ａ，Ｂに示すような座屈変形が段差部１０７で最初に発生する。   The buckling deformation of the casing 101 due to the longitudinal load is most likely to occur in the upper and lower step portions 107 and 107 formed at the boundary between the upper and lower body portions 104b and 104b and the central body portion 104a. The step portion 107 is a portion having the weakest buckling strength as compared with the central body portion 104a and the upper and lower body portions 104b and 104b, and the buckling deformation as shown in FIGS. To do.

すなわち、縦荷重が作用していない状態では、上下の段差部１０７，１０７は図４Ａに示す通常の状態が維持されるが、壜体１０１に段差部１０７の許容範囲を超える大きな縦荷重Ｗが加わると、図４Ｂに示すように、縦荷重Ｗに耐えることができなくなった段差部１０７が反転して座屈変形が発生する。   That is, in the state where the vertical load is not applied, the upper and lower stepped portions 107 and 107 maintain the normal state shown in FIG. 4A, but the casing 101 has a large vertical load W exceeding the allowable range of the stepped portion 107. When applied, as shown in FIG. 4B, the stepped portion 107 that cannot withstand the longitudinal load W is inverted and buckling deformation occurs.

このような縦荷重による座屈変形の防止に関する一般的な先行技術として、特許文献１には、隣接するパネル部間に縦方向にはしる凸状または凹状の補強リブを、その一部が消失して不連続となるように形成し、且つ隣り合う胴体部分に設けられた補強リブの消失部を縦方向に対して異なる高さに位置させるようにした構造が開示されている。   As a general prior art regarding the prevention of buckling deformation due to such a longitudinal load, Patent Document 1 discloses that a part of a convex or concave reinforcing rib extending in the vertical direction between adjacent panel portions disappears. In other words, a structure is disclosed that is formed so as to be discontinuous, and the disappearing portions of the reinforcing ribs provided in the adjacent body portions are positioned at different heights with respect to the vertical direction.

特許文献１に記載された構成は、本明細書の図３を参考に説明すれば、減圧吸収パネル１０８ａ間の柱部（胴部本体）１０９に軸方向に対する剛性を付与することにより、柱部（胴部本体）１０９全体として高い座屈強度を得ようとするものであり、座屈強度の弱い段差部１０７を積極的に補強する構造は開示されていない。   If the structure described in Patent Document 1 is described with reference to FIG. 3 of the present specification, the column portion (body main body) 109 between the vacuum absorption panels 108a is given rigidity in the axial direction, thereby providing a column portion. (Body body) 109 is intended to obtain a high buckling strength as a whole, and a structure for positively reinforcing the stepped portion 107 having a low buckling strength is not disclosed.

本発明は、上記した従来技術における問題点を解消すべく、外径寸法の異なる胴部の境目に形成される段差部を積極的に補強し、この段差部の反転による座屈変形の発生を防止できるようにした合成樹脂製壜体を創出することを課題とする。   In order to solve the above-described problems in the prior art, the present invention positively reinforces the stepped portion formed at the boundary between the body portions having different outer diameter dimensions, and generates buckling deformation due to the inversion of the stepped portion. It is an object to create a synthetic resin casing that can be prevented.

上記課題を解決するための手段のうち、本発明の主たる構成は、
口筒部と、口筒部から徐々に拡径する肩部と、肩部から連続する有底筒状の胴部と、底部とを有する２軸延伸ブロー成形された合成樹脂製壜体において、
胴部は、複数の平坦壁を有して構成されるパネル配設領域と、パネル配設領域の上下両側となる位置にパネル配設領域よりも大きな外径寸法からなる最大径領域とを有し、
パネル配設領域は平断面が正多角形状で形成され、平坦部に減圧吸収パネルが設けられ、隣接する減圧吸収パネル間に柱部が設けられて構成されており、
パネル配設領域と最大径領域との境目に傾斜状の段差部を設けると共に、縦荷重による段差部の座屈変形を防止する複数のリブを、段差部と柱部との間に跨って斜めに鎹状に配設したことを特徴とする、と云うものである。 Of the means for solving the above problems, the main configuration of the present invention is as follows.
In a biaxially stretched blow molded synthetic resin casing having a mouth tube portion, a shoulder portion gradually expanding from the mouth tube portion, a bottomed tubular body portion continuous from the shoulder portion, and a bottom portion,
The body portion has a panel disposition area constituted by a plurality of flat walls, and a maximum diameter area having an outer diameter larger than that of the panel disposition area at positions on both upper and lower sides of the panel disposition area. And
The panel disposition area is formed with a regular cross-sectional shape of a flat cross section , a flat part is provided with a vacuum absorbing panel, and a column part is provided between adjacent vacuum absorbing panels.
A sloped stepped portion is provided at the boundary between the panel placement region and the maximum diameter region, and a plurality of ribs that prevent buckling deformation of the stepped portion due to a longitudinal load are slanted between the stepped portion and the column portion. It is said that it is arranged in a bowl shape .

上記構成の壜体では、複数のリブが、パネル配設領域と最大径領域との間の段差部に高い座屈強度を付与する。特に、上記のようにパネル配設領域と最大径領域の外径寸法に寸法差があると、この寸法差によって生じた段差部に縦荷重が集中し、図４Ｂに示すように段差部が反転することによる座屈変形が発生しやすい。上記構成では、リブが段差部を支える鎹（かすがい）として機能し、段差部の反転による座屈変形を防止する。
しかも、リブを、減圧吸収パネルではなく、縦方向に高い剛性を有する柱部に形成することにより、段差部をしっかり支えてその反転を防止するというリブ本来の機能を最大限発揮できる状態が確保される。 In the casing having the above-described configuration, the plurality of ribs impart high buckling strength to the step portion between the panel arrangement region and the maximum diameter region. In particular, if there is a dimensional difference between the outer diameter dimensions of the panel placement area and the maximum diameter area as described above, the vertical load is concentrated on the stepped portion caused by the dimensional difference, and the stepped portion is reversed as shown in FIG. 4B. Buckling deformation is likely to occur. In the above-described configuration, the rib functions as a flange that supports the step portion, and prevents buckling deformation due to the inversion of the step portion.
In addition, by forming the ribs on the pillars with high rigidity in the vertical direction, rather than on the vacuum absorption panels, it is possible to ensure that the original function of the ribs can be fully exerted by firmly supporting the stepped parts and preventing their reversal. Is done.

本発明の他の構成は、上記構成において、段差部がパネル配設領域の縦方向の両端部に形成されている、と云うものである。
上記構成では、パネル配設領域の縦方向の両端部に形成された上下の段差部の座屈強度を夫々高めることができ、全体として座屈変形に強い壜体とすることができる。 Another configuration of the present invention is that, in the above configuration, the stepped portions are formed at both ends in the vertical direction of the panel arrangement region.
In the above configuration, the buckling strength of the upper and lower stepped portions formed at both ends in the vertical direction of the panel arrangement region can be increased, respectively, and the overall body can be resistant to buckling deformation.

また本発明の他の構成は、上記いずれかの構成において、パネル配設領域と近接する位置に段差部が設けられている、と云うものである。
上記構成では、段差部は座屈変形が防止されているため、その近傍に設けたパネル配設領域内の減圧吸収パネルの動作を確保し、その機能が確実に発揮されるようになる。 According to another configuration of the present invention, in any one of the above configurations, a step portion is provided at a position close to the panel arrangement region.
In the above configuration, since the stepped portion is prevented from buckling deformation, the operation of the reduced pressure absorption panel in the panel disposition area provided in the vicinity thereof is ensured, and the function is reliably exhibited.

また本発明の他の構成は、上記いずれかの構成において、パネル配設領域の上下両側に段差部を設け、リブを上下の段差部と柱部との間に配設した、と云うものである。According to another configuration of the present invention, in any one of the configurations described above, stepped portions are provided on both upper and lower sides of the panel disposition region, and ribs are disposed between the upper and lower stepped portions and the column portions. is there.

また本発明の他の構成は、上記いずれかの構成において、リブを、壜体の内部から外部方向に向かって突出する凸状とした、と云うものである。According to another configuration of the present invention, in any of the above configurations, the rib has a convex shape that protrudes from the inside of the housing toward the outside.

本発明は、上記した構成となっているので、以下に示す効果を奏する。
本発明の主たる構成においては、パネル配設領域と最大径領域との境目の段差部に形成された複数のリブが段差部を補強してその座屈強度を高め、段差部の反転による座屈変形の発生を防止する。これにより、段差部を契機とするさらなる座屈変形の進行を阻止することができる。 Since the present invention has the above-described configuration, the following effects can be obtained.
In the main configuration of the present invention, a plurality of ribs formed at the stepped portion at the boundary between the panel arrangement region and the maximum diameter region reinforce the stepped portion to increase its buckling strength, and buckle by reversing the stepped portion. Prevents deformation. Thereby, the progress of the further buckling deformation triggered by the step portion can be prevented.

また減圧吸収パネルの機能を備えることにより、減圧時にこの減圧吸収パネルを陥没状に変形させて、良好な外観を保持することが可能となる。しかも高い剛性を有する柱部で減圧吸収パネルを確実に支持することが可能となるため、減圧時における減圧吸収パネルのスムーズな変形動作を実現することができる。   Also, by providing the function of the reduced pressure absorption panel, it is possible to deform the reduced pressure absorption panel into a depressed shape at the time of pressure reduction and maintain a good appearance. And since it becomes possible to support a decompression absorption panel reliably by the pillar part which has high rigidity, the smooth deformation | transformation operation | movement of the decompression absorption panel at the time of decompression is realizable.

また高い剛性を有する柱部にリブが形成されることで補強部材としてのリブの機能を確実に果たすことが可能となるため、さらに段差部の座屈強度を高めることができ、段差部での座屈変形をより確実に防止することが可能となる。よって、より座屈変形に強い壜体を提供することが可能となる。   In addition, since the rib is formed on the pillar portion having high rigidity, the function of the rib as the reinforcing member can be surely achieved, so that the buckling strength of the step portion can be further increased. It becomes possible to prevent buckling deformation more reliably. Therefore, it is possible to provide a housing that is more resistant to buckling deformation.

また段差部がパネル配設領域の縦方向の両端部に形成される構成にあっては、上側の段差部及び下側の段差部における座屈変形を夫々防止することができる。また壜体の上下の位置に、最大外径寸法からなる最大径領域を夫々設けることができるため、搬送中の壜体同士の衝突を両側の最大径領域が担うことが可能となり、中央のパネル配設領域同士の直接的な衝突を避けることができる。さらに両側の最大径領域の外径寸法を最大外径寸法に設定した状態で、パネル配設領域の外径寸法を制御することにより、内容量の調整を行うことができる。   Further, in the configuration in which the stepped portions are formed at both ends in the vertical direction of the panel arrangement region, buckling deformation at the upper stepped portion and the lower stepped portion can be prevented. In addition, since the maximum diameter area consisting of the maximum outer diameter can be provided at the upper and lower positions of the chassis, it is possible for the maximum diameter areas on both sides to bear the collision between the chassis during transportation, and the center panel A direct collision between the arrangement areas can be avoided. Further, the inner capacity can be adjusted by controlling the outer diameter dimension of the panel arrangement area in a state where the outer diameter dimension of the maximum diameter area on both sides is set to the maximum outer diameter dimension.

またパネル配設領域と近接する位置に段差部を設けるようにした構成においては、パネル配設領域に設けられた減圧吸収パネルの動作を確保し、その機能が確実に発揮されるため、減圧時には減圧吸収パネルが確実に陥没状に変形することができ、良好な壜体外観を保持することが可能となる。   In addition, in the configuration in which the step portion is provided at a position close to the panel arrangement area, the operation of the vacuum absorption panel provided in the panel arrangement area is ensured and the function is reliably exhibited. The reduced pressure absorption panel can be reliably deformed into a depressed shape, and a good housing appearance can be maintained.

本発明の実施例を示す合成樹脂壜体の正面図である。It is a front view of the synthetic resin housing which shows the Example of this invention. 図１のII−II線における概略平断面図である。It is a schematic plane sectional view in the II-II line of FIG. 従来の合成樹脂製壜体の一例を示す正面図である。It is a front view which shows an example of the conventional synthetic resin casing. 壜体に設けられた段差部の概略を部分的に拡大して示す縦断面図であり、Ａは変形前の状態、Ｂは座屈変形後の状態である。It is the longitudinal cross-sectional view which expands and shows the outline of the level | step-difference part provided in the housing partially, A is the state before a deformation | transformation, B is the state after buckling deformation.

以下、本発明の実施の形態について図面を参照しつつ説明する。
図１は本発明の実施例を示す合成樹脂壜体の平面図、図２は図１のII−II線における概略平断面図である。 Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a plan view of a synthetic resin casing showing an embodiment of the present invention, and FIG. 2 is a schematic cross-sectional view taken along line II-II in FIG.

この実施例に示す壜体１は、口筒部２、肩部３、筒状の胴部４、底部５を有するＰＥＴ樹脂製の２軸延伸ブロー成形品である。なお、壜体１に使用される材料はＰＥＴに限定されるものではなく、たとえばポリプロピレン（ＰＰ）などであってもよい。
胴部４の縦（軸）方向の中央の位置にはパネル配設領域４ａが設けられ、このパネル配設領域４ａを挟んで上下両側となる位置に最大径領域４ｂ，４ｂが一体に設けられている。胴部４の外径寸法は、両側に設けられた最大径領域４ｂ，４ｂの外径寸法Ｌが最大であり、中央に設けられたパネル配設領域４ａの外径寸法は最大径領域４ｂ，４ｂの外径寸法Ｌよりも小さく形成されている。そして、壜体１の縦方向の両側の位置で、且つパネル配設領域４ａと最大径領域４ｂ，４ｂとの境目には傾斜状の段差部７，７が夫々形成されている。 The casing 1 shown in this embodiment is a biaxial stretch blow-molded product made of PET resin having a mouth tube portion 2, a shoulder portion 3, a cylindrical body portion 4, and a bottom portion 5. In addition, the material used for the housing 1 is not limited to PET, For example, polypropylene (PP) etc. may be sufficient.
A panel disposition region 4a is provided at a central position in the longitudinal (axial) direction of the body portion 4, and maximum diameter regions 4b and 4b are integrally provided at positions on both upper and lower sides across the panel disposition region 4a. ing. The outer diameter dimension of the body portion 4 is the maximum outer diameter dimension L of the maximum diameter areas 4b, 4b provided on both sides, and the outer diameter dimension of the panel arrangement area 4a provided in the center is the maximum diameter area 4b, It is formed smaller than the outer diameter L of 4b. In addition, inclined step portions 7 and 7 are formed at positions on both sides in the longitudinal direction of the casing 1 and at the boundary between the panel arrangement region 4a and the maximum diameter regions 4b and 4b.

なお、最大径領域４ｂ，４ｂの外径寸法Ｌは、自動販売機内への装填が許容される最大外径寸法に等しく設定されており、この壜体１は自動販売機用としても充分に使用できるようになっている。   The outer diameter L of the maximum diameter regions 4b, 4b is set equal to the maximum outer diameter that is allowed to be loaded into the vending machine, and the housing 1 is sufficiently used for vending machines. It can be done.

上記のように、最大径領域４ｂ，４ｂの外径寸法Ｌを、パネル配設領域４ａの外径寸法よりも大きく設定しておくことにより、搬送ラインで搬送される場合や自動販売機内で横積みの状態で積層保管された場合であっても、前後または上下で隣り合う壜体１間では、互いに外径寸法の大きな両側の最大径領域４ｂ，４ｂ同士のみを衝突または当接させることができ、中央のパネル配設領域４ａ同士が直接衝突または当接することを防止することができる。よって、パネル配設領域４ａに設けられた後述の減圧吸収パネル同士の直接的な衝突や当接を避けることができ、減圧吸収パネルの変形を防止して減圧吸収機能を充分に発揮できる状態を維持することが可能となる。   As described above, by setting the outer diameter L of the maximum diameter areas 4b and 4b to be larger than the outer diameter dimension of the panel arrangement area 4a, the outer diameter dimension of the maximum diameter areas 4b and 4b can be increased. Even when stacked and stored in a stacked state, only the maximum diameter regions 4b and 4b on both sides having large outer diameters can collide or abut each other between the adjacent casings 1 in the front-rear or top-bottom direction. It is possible to prevent the central panel disposition region 4a from directly colliding with or coming into contact with each other. Therefore, it is possible to avoid a direct collision or contact between the below-described reduced pressure absorption panels provided in the panel arrangement region 4a, and to prevent the deformation of the reduced pressure absorption panel and sufficiently exhibit the reduced pressure absorption function. Can be maintained.

パネル配設領域４ａは６枚の平坦壁８を有して形成されており、各平坦壁８には縦長矩形状の６ケの減圧吸収パネル８ａが並列状に陥没形成されている。そして、隣接する減圧吸収パネル８ａ間には、壜体１の剛性や座屈強度を担う柱部９が縦方向に沿って形成されている。図２に示されるように、本実施例におけるパネル配設領域４ａの平断面形状は正六角形状となっている。   The panel disposition region 4a is formed with six flat walls 8, and six flat vacuum absorbing panels 8a are formed in each flat wall 8 so as to be recessed in parallel. And the column part 9 which bears the rigidity and buckling strength of the housing 1 is formed along the vertical direction between the adjacent decompression absorption panels 8a. As shown in FIG. 2, the flat cross-sectional shape of the panel arrangement region 4a in the present embodiment is a regular hexagon.

上側の最大径領域４ｂには、周溝リブ６を形成して面剛性を高くして、高い形状保形性を有するものとなっている。なお、この実施例では下側の最大径領域４ｂは周溝リブを備えた構成とはしていないが、下側の最大径領域４ｂについても上側同様の周溝リブ６を形成した構成とするものであってもよい。   A circumferential groove rib 6 is formed in the upper maximum diameter region 4b to increase the surface rigidity and to have high shape retention. In this embodiment, the lower maximum diameter region 4b is not provided with a circumferential groove rib, but the lower maximum diameter region 4b is provided with the same peripheral groove rib 6 as the upper side. It may be a thing.

図１に示すように、段差部７には複数のリブ１０が形成されている。各リブ１０は、壜体１の内部から外部方向に向かって突出する凸状であり、且つ段差部７と柱部９との間に跨って斜めに鎹（かすがい）状に設けられている。そして、各リブ１０は、段差部７の周囲の６ヶ所の位置に等間隔（または等中心角ともいう）に配置されている。複数のリブ１０は、段差部７の座屈強度を高め、縦荷重によって段差部７が反転することによる座屈変形を防止する補強部材として機能する。   As shown in FIG. 1, a plurality of ribs 10 are formed on the stepped portion 7. Each rib 10 is a convex shape that protrudes from the inside of the housing 1 toward the outside, and is provided in a slanting shape between the step portion 7 and the column portion 9 in an oblique manner. . The ribs 10 are arranged at six positions around the stepped portion 7 at equal intervals (also referred to as equal central angles). The plurality of ribs 10 function as reinforcing members that increase the buckling strength of the stepped portion 7 and prevent buckling deformation caused by the stepped portion 7 being inverted by a longitudinal load.

複数のリブ１０は、壜体１に大きな縦荷重が作用しても変形しにくい座屈強度の高い柱部９に形成されている。これにより柱部９は複数のリブ１０をしっかりと支持することが可能であり、段差部７全体の座屈強度を高めて段差部７における座屈変形をより効果的に防止する。   The plurality of ribs 10 are formed in the column portion 9 having a high buckling strength that is not easily deformed even when a large longitudinal load is applied to the housing 1. Thereby, the pillar part 9 can support the some rib 10 firmly, raises the buckling strength of the whole step part 7, and prevents the buckling deformation in the step part 7 more effectively.

複数のリブ１０を有しない壜体１においても、壜体１に縦荷重が、正六角形状のパネル配設領域４ａを構成する各平坦壁８に対して均等に作用する限りにおいては、パネル配設領域４ａは座屈変形しにくくなる。しかし、現実には縦荷重が各平坦壁８に対して均等に作用することは有りえず、縦荷重は必ずいずれかに偏った状態で作用する。このように縦荷重が、偏った状態で壜体１のパネル配設領域４ａに作用するときに、壜体１の段差部７に複数のリブ１０を形成していない場合には、上述したようにその偏った位置において段差部７が反転して座屈変形を起こす。すると、その直下に位置するパネル配設領域４ａを構成する、いずれかの正六角形状の角ａ，ｂ，ｃ，ｄ，ｅ及びｆ、またはいずれかの平面壁８に、壜体１の外部に拡張する方向の力Ｆ１又は内部に収縮する方向の力Ｆ１’が作用する。   Even in the case 1 without the plurality of ribs 10, as long as the vertical load acts on the flat wall 8 constituting the regular hexagonal panel disposition region 4 a, The installation region 4a is less likely to buckle. However, in reality, the longitudinal load cannot act evenly on each flat wall 8, and the longitudinal load always acts in a biased state. As described above, when the plurality of ribs 10 are not formed on the stepped portion 7 of the casing 1 when the vertical load acts on the panel arrangement region 4a of the casing 1 in a biased state as described above. On the other hand, the stepped portion 7 is inverted at the biased position to cause buckling deformation. Then, one of the regular hexagonal corners a, b, c, d, e, and f that constitutes the panel arrangement region 4a located immediately below, or any one of the planar walls 8 is connected to the outside of the casing 1. The force F1 in the direction of expanding or the force F1 ′ in the direction of contracting inward is applied.

たとえば、図２に示すように角ａに壜体１の外部に拡張する方向の力Ｆ１が作用したとすると、この角ａに隣接する両側の平坦面８，８は拡張する外方向の力Ｆ１の抵抗として機能し、この平坦面８，８に続く角ｂ及び角ｆには逆に壜体１の内側に収縮する内方向の力Ｆ１’が内部応力として夫々発生する。そして、同様に、角ｂ及び角ｆにはこれに隣接する両側の平坦面８，８が収縮する内方向の力Ｆ１’の抵抗として機能するため、角ｃ及び角ｅには逆に拡大する外方向の力Ｆ１が内部応力として夫々発生する。以下同様となるので、結局角ａ，ｃ，ｅには壜体１の外部に拡張する外方向の力Ｆ１が作用し、角ｂ，ｄ，ｆには壜体１の内側に収縮する内方向の力Ｆ１’が作用する。   For example, as shown in FIG. 2, if a force F1 in the direction of expanding to the outside of the casing 1 is applied to the corner a, the flat surfaces 8 and 8 on both sides adjacent to the corner a are expanded outward force F1. On the other hand, in the corners b and f following the flat surfaces 8 and 8, an inward force F1 ′ contracting inside the housing 1 is generated as an internal stress. Similarly, the corner b and the corner f function as a resistance of the inward force F1 ′ that the flat surfaces 8 and 8 on both sides adjacent to the corner b and the corner f contract, so that the corner c and the corner e are enlarged on the contrary. An outward force F1 is generated as an internal stress. Thereafter, the same applies to the corners a, c, and e, and an outward force F1 that expands outside the casing 1 acts on the corners a, c, and e. The force F1 ′ is applied.

このような作用により、縦荷重が偏った状態で作用した壜体１は、パネル配設領域４ａが３つの角ａ、角ｃ、角ｅを頂点とした断面略正三角形状（図２に破線で示す。）に変形させられてしまうことになる。   Due to such an action, the casing 1 which has acted in a state where the longitudinal load is biased has a panel arrangement region 4a having a substantially equilateral triangular cross section with three corners a, c and e as vertices (the broken line in FIG. 2). It will be deformed as shown in FIG.

しかし、上記のように段差部７に複数のリブ７を形成した構成では、段差部７の反転による座屈変形が防止されるため、パネル配設領域４ａを構成する角ａ，ｂ，ｃ，ｄ，ｅ及びｆ又は各平面壁８に、外部に拡張する外方向の力Ｆ１又は内側に収縮する内方向の力Ｆ１’が作用することがなくなる。よって、パネル配設領域４ａの正六角形状を保持すること、すなわち壜体１の良好な外観を保持することが可能となる。特に、図２に示すような角ａ、角ｃ、角ｅが外方向に突出する変形を抑えることが可能となるため、搬送時等において隣接する壜体１の間でのパネル配設領域４ａ同士の衝突や当接を起こりにくくすることができる。   However, in the configuration in which the plurality of ribs 7 are formed in the stepped portion 7 as described above, buckling deformation due to the inversion of the stepped portion 7 is prevented, so the corners a, b, c, and An outward force F1 that expands outward or an inward force F1 ′ that contracts inward does not act on d, e, and f or each flat wall 8. Therefore, it becomes possible to maintain the regular hexagonal shape of the panel arrangement region 4a, that is, to maintain a good appearance of the housing 1. In particular, since it is possible to suppress the deformation of the corners a, c, and e protruding outward as shown in FIG. 2, the panel arrangement region 4a between the adjacent casings 1 at the time of transportation or the like. It is possible to make it difficult for collisions and contact between each other.

以上、実施例に沿って本発明の構成とその作用効果について説明したが、本発明の実施の形態は上記実施例に限定されるものではない。   As mentioned above, although the structure of this invention and its effect were demonstrated along the Example, embodiment of this invention is not limited to the said Example.

たとえば、上記実施例ではパネル配設領域４ａの平断面形状を正六角形状として説明したが、本発明はこれに限定されるものではなく、本発明の目的、すなわち段差部７を補強して座屈変形を防止するという目的に鑑みれば、段差部７と複数のリブ１０を有する構成であればよく、パネル配設領域４ａの平断面形状はその他の形状、たとえば正三角形状、正四角形状、正五角形状、正八角形状等の正多角形状とすることは可能であるし、または円筒形状とすることも可能である。   For example, in the above embodiment, the plane cross-sectional shape of the panel arrangement region 4a has been described as a regular hexagonal shape, but the present invention is not limited to this, and the object of the present invention, that is, the stepped portion 7 is reinforced. In view of the purpose of preventing the bending deformation, any configuration having the stepped portion 7 and the plurality of ribs 10 may be used, and the plane cross-sectional shape of the panel disposition region 4a may be other shapes such as a regular triangle shape, a regular square shape, A regular polygonal shape such as a regular pentagonal shape or a regular octagonal shape may be used, or a cylindrical shape may be employed.

したがって、減圧吸収パネル８ａを設けることも本発明の目的を達成する限りにおいては必須の要件ではない。しかし、上記のように減圧吸収パネル８ａを有する構成の方が、減圧時にこの減圧吸収パネル８ａを陥没状に変形させて減圧吸収機能を発揮することにより、壜体１の良好な外観を保持する機能を備えることができる点で好ましい。   Therefore, providing the reduced pressure absorption panel 8a is not an essential requirement as long as the object of the present invention is achieved. However, the configuration having the reduced pressure absorption panel 8a as described above retains a good appearance of the housing 1 by deforming the reduced pressure absorption panel 8a into a depressed shape at the time of reduced pressure and exhibiting the reduced pressure absorption function. It is preferable at the point which can provide a function.

また上記実施例では上下の段差部７，７の夫々にリブ１０を形成した場合を示して説明したが、本発明はこれに限定されるものではない。たとえばパネル配設領域４ａが傾斜状からなる壜体１の場合にあっては、パネル配設領域４ａのうち最も外径寸法の小さい部分と最大外径部４ｂとの一方の境目のみに段差部７が形成され、パネル配設領域４ａのうち最も外径寸法の大きな部分と最大外径部４ｂとの他方の境目の部分には段差部７を有しない壜体１となるが、このような構成からなる壜体１にあっては、リブ１０を一方の境目に形成された段差部７のみに設けるようにした構成とすることが可能である。   Moreover, although the said Example showed and demonstrated the case where the rib 10 was formed in each of the upper and lower level | step-difference parts 7, 7, this invention is not limited to this. For example, in the case where the panel arrangement region 4a is an inclined casing 1, the stepped portion is formed only at one boundary between the smallest outer diameter portion and the maximum outer diameter portion 4b in the panel arrangement region 4a. 7 is formed, and the casing 1 having no stepped portion 7 is formed at the other boundary portion between the largest outer diameter portion and the largest outer diameter portion 4b in the panel arrangement region 4a. The casing 1 having the configuration can be configured such that the rib 10 is provided only on the stepped portion 7 formed at one boundary.

上記構成では、少なくともリブ１０が形成された段差部７の座屈強度を高めることができ、この段差部７での座屈変形を防止することが可能である。   In the above configuration, the buckling strength of the stepped portion 7 where at least the rib 10 is formed can be increased, and buckling deformation at the stepped portion 7 can be prevented.

本発明の合成樹脂製壜体は、外径寸法の異なる壜体胴部の境目に形成される段差部での座屈強度を高めたものであり、保管時や搬送時に壜体を積載する必要があるボトル分野における用途展開をさらに広い領域で図ることができる。   The synthetic resin casing of the present invention has increased buckling strength at the stepped portion formed at the boundary of the casing body with different outer diameter dimensions, and it is necessary to load the casing at the time of storage and transportation Applications can be expanded in a wider area.

１ ；壜体
２ ；口筒部
３ ；肩部
４ ；胴部
４ａ ；パネル配設領域
４ｂ ；最大径領域
５ ；底部
６ ；周溝リブ
７ ；段差部
８ ；平坦壁
８ａ ；減圧吸収パネル
９ ；柱部
１０ ；リブ DESCRIPTION OF SYMBOLS 1; Housing 2; Mouth part 3; Shoulder part 4; Body part 4a; Panel arrangement | positioning area | region 4b; Maximum diameter area | region 5; Bottom part 6; Circumferential groove rib 7; ; Pillar part 10; rib

Claims (5)

口筒部(2)と、該口筒部(2)から徐々に拡径する肩部(3)と、該肩部(3)から連続する胴部(4)と、底部(5)とを有する２軸延伸ブロー成形された合成樹脂製壜体において、
前記胴部(4)は、複数の平坦壁(8)を有して構成されるパネル配設領域(4a)と、該パネル配設領域(4a)の上下両側となる位置に前記パネル配設領域(4a)よりも大きな外径寸法からなる最大径領域(4b)とを有し、
前記パネル配設領域(4a)は平断面が正多角形状で形成され、前記平坦壁(8)に減圧吸収パネル(8a)が設けられ、隣接する該減圧吸収パネル(8a)間に柱部(9)が設けられて構成されており、
前記パネル配設領域(4a)と前記最大径領域(4b)との境目に傾斜状の段差部(7)を設けると共に、縦荷重による前記段差部(7)の座屈変形を防止する複数のリブ(10)を、前記段差部(7)と前記柱部(9)との間に跨って斜めに鎹状に配設したことを特徴とする合成樹脂壜体。 A mouth tube portion (2), a shoulder portion (3) gradually expanding from the mouth tube portion (2), a body portion (4) continuous from the shoulder portion (3), and a bottom portion (5). In a biaxial stretch blow molded synthetic resin casing,
The body portion (4) is provided with a panel disposition region (4a) having a plurality of flat walls (8) , and the panel disposition at positions on both upper and lower sides of the panel disposition region (4a). A maximum diameter region (4b) having a larger outer diameter than the region (4a),
The panel providing area (4a) has a flat cross section are formed in a regular polygon, the vacuum in the flat wall (8) absorption panel (8a) is provided, the pillar portion between adjacent said vacuum panels (8a) ( 9)
A sloped stepped portion (7) is provided at the boundary between the panel arrangement region (4a) and the maximum diameter region (4b), and a plurality of buckling deformations of the stepped portion (7) due to a longitudinal load are prevented. A synthetic resin casing characterized in that the rib (10 ) is disposed in a slanting manner in a bowl shape between the step portion (7) and the column portion (9) . 段差部(7)が、パネル配設領域(4a)の縦方向の両端部に形成されている請求項１記載の合成樹脂壜体。   The synthetic resin casing according to claim 1, wherein the stepped portion (7) is formed at both longitudinal end portions of the panel arrangement region (4a). パネル配設領域(4a)と近接する位置に段差部(7)が設けられている請求項１または２記載の合成樹脂壜体。   The synthetic resin casing according to claim 1 or 2, wherein a step portion (7) is provided at a position close to the panel arrangement region (4a). パネル配設領域(4a)の上下両側に段差部（7）を設け、リブ（10）を上下の段差部（7）と柱部(9)との間に配設した請求項１乃至３のいずれか一項に記載の合成樹脂壜体。The step (7) is provided on both upper and lower sides of the panel arrangement region (4a), and the rib (10) is arranged between the upper and lower step (7) and the column (9). The synthetic resin housing as described in any one of Claims. リブ（10）を、壜体(1)の内部から外部方向に向かって突出する凸状とした請求項１乃至４のいずれか一項に記載の合成樹脂壜体。The synthetic resin housing according to any one of claims 1 to 4, wherein the rib (10) has a convex shape protruding from the inside of the housing (1) toward the outside.
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