JP5647849B2

JP5647849B2 - Plastic container

Info

Publication number: JP5647849B2
Application number: JP2010223774A
Authority: JP
Inventors: 田中　剛太; 剛太田中
Original assignee: Mikasa Sangyo Co Ltd
Current assignee: Mikasa Sangyo Co Ltd
Priority date: 2010-10-01
Filing date: 2010-10-01
Publication date: 2015-01-07
Anticipated expiration: 2030-10-01
Also published as: JP2012076793A

Description

本発明は合成樹脂製容器に関し、より詳細には、容器胴部のパネル構造に特徴のある合成樹脂製容器に関する。 The present invention relates to a synthetic resin container, and more particularly to a synthetic resin container characterized by a panel structure of a container body.

従来、ポリエチレンテレフタレート（ＰＥＴ）等の樹脂製の容器、例えば、それらで作成された壜様の容器があるが、このような容器は、硝子製の容器と比較して剛性が低いため、容器内の圧力変化（特に、減圧）によって変形し、外観等に不良を生じ易い。特に、このような圧力変化は、例えば、衛生上の観点等から、内容物を高温で充填することがおこなわれる液体調味料分野において、容器に高温の内容物が充填された後に該容器が蓋等により密閉され冷却される際に生じる。 Conventionally, there are resin-made containers such as polyethylene terephthalate (PET), for example, bag-like containers made of them, but such containers are less rigid than glass-made containers. It is likely to be deformed by a change in pressure (particularly, reduced pressure), resulting in poor appearance and the like. In particular, such a pressure change is caused by, for example, a sanitary viewpoint, in the liquid seasoning field where the contents are filled at a high temperature, after the container is filled with the high-temperature contents, the container is closed. Occurs when sealed and cooled by, for example.

この様な問題に対しては、従来、該容器の胴部に減圧吸収パネルを設けることで耐圧性を改善している。この様な減圧吸収パネルは多くの場合、該容器の胴部に凹面として形成される（例えば、特許文献１を参照）。又、該凹面様の減圧吸収パネルの中央に更に略半円柱形状の島部を設け、より耐圧性を改善した容器もある（例えば、特許文献２を参照）。 Conventionally, the pressure resistance is improved by providing a vacuum absorption panel in the body of the container. Such a vacuum absorption panel is often formed as a concave surface in the body of the container (see, for example, Patent Document 1). In addition, there is a container in which an approximately semi-cylindrical island portion is further provided at the center of the concave-like vacuum absorbing panel to further improve the pressure resistance (see, for example, Patent Document 2).

実開平３−８７６４４号公報Japanese Utility Model Publication No. 3-87644 特開２００４−３５１１０号公報JP 2004-35110 A

しかしながら、上記のような略半円柱形状の島部を形成した減圧吸収パネルは、容器の耐圧性に対して一定の効果は得られるものの、容器内がある一定以上に減圧された際又は外部からの力によって、島部が反転してしまい、その効果が損なわれる可能性がある。島部をより肉厚に形成すれば、該島部が反転することは防げるが、今度は、該島部の箇所の剛性が増すため、減圧吸収パネル、特に該島部の効果自体が低下してしまう。このような問題は、内容物の高温での充填を妨げ、特に、衛生上の観点からより高温での充填が求められる液体調味料用の容器では大きな問題となる。 However, the vacuum absorption panel formed with the substantially semi-cylindrical island as described above has a certain effect on the pressure resistance of the container, but when the container is depressurized above a certain level or from the outside Due to this force, the island portion may be reversed, and the effect may be impaired. If the island part is formed thicker, it is possible to prevent the island part from inverting, but this time, since the rigidity of the island part increases, the reduced pressure absorption panel, in particular, the effect of the island part itself decreases. End up. Such a problem hinders the filling of the contents at a high temperature, and becomes a big problem particularly in containers for liquid seasonings that are required to be filled at a higher temperature from the viewpoint of hygiene.

そこで、本発明は、減圧吸収パネルを更に改良し、従来容器の減圧吸収パネルよりも減圧吸収効果を高め、該容器内の圧力変化に対する耐性をより高めた合成樹脂製容器を提供することを目的とする。 Therefore, the present invention aims to provide a synthetic resin container that further improves the reduced-pressure absorption panel, enhances the reduced-pressure absorption effect as compared with the reduced-pressure absorption panel of the conventional container, and further increases the resistance to pressure change in the container. And

本発明は、胴部にリブにより離間された複数の減圧吸収パネルを有する合成樹脂製容器であって、該リブは、該容器の高さ方向に延びており、該減圧吸収パネルは、凹面部及び島部により構成され、該島部は、該凹面部対して外方に向かった凸状に形成されると共にその全周が該凹面部によって囲まれ、平面視略瓢箪形状且つ該凹面部に対して双瘤形状に形成されるものであると共に２つの頂部を有し、該頂部はその間に形成された中央部を介して連続しているものであり、該頂部及び該中央部は、縦断面視円弧状に形成され、該島部の該凹面部からの高さが、該中央部が最も低くなるように形成されていると共に該島部の該容器の周方向の幅が、該中央部が最も細くなるように形成されていることを特徴とする合成樹脂製容器である。 The present invention is a synthetic resin container having a plurality of reduced pressure absorption panels spaced apart by ribs on a body part, the ribs extending in the height direction of the container, and the reduced pressure absorption panel is a concave surface part. And the island portion is formed in a convex shape facing outward with respect to the concave surface portion, and the entire circumference thereof is surrounded by the concave surface portion, and has a substantially bowl shape in plan view and the concave surface portion. In contrast, it is formed in a twin-knob shape and has two apexes, and the apex is continuous through a central part formed between the apex and the central part. It is formed in an arc shape in a plan view, and the height of the island portion from the concave surface portion is formed so that the center portion is the lowest, and the width of the container in the circumferential direction of the island portion is the center. It is a synthetic resin container characterized in that the portion is formed to be the thinnest .

又、本発明は、前記島部は、島部の前記容器の高さ方向の長さが、前記減圧吸収パネルの該容器の高さ方向の長さの５０乃至９０％であることを特徴とする合成樹脂製容器である。 Further, the present invention is characterized in that the length of the island portion in the height direction of the container is 50 to 90% of the length of the decompression absorption panel in the height direction of the container. This is a synthetic resin container.

又、本発明は、前記リブは、前記容器の外方に向って略円弧状であることを特徴とする合成樹脂製容器である。 Further, the present invention is the synthetic resin container, wherein the rib has a substantially arc shape toward the outside of the container.

本発明は、合成樹脂製容器の胴部に複数の凹面部及び島部で構成される減圧吸収パネルを形成し、該島部を該凹面部に対して双瘤形状に形成することにより、該島部の反転を防止することができるため、該容器内の圧力変化に対する耐性がより高い合成樹脂製容器を提供することができる。又、該島部は平面視略瓢箪形状に形成することもできる。好ましくは、該島部は、その中央部が、該凹面部からの高さが最も低く、又は／且つ、該容器の周方向の幅が最も細く形成される。更に、該島部の前記容器の高さ方向の長さが、該減圧吸収パネルの該長さの５０乃至９０％であることが好ましい。 The present invention forms a reduced pressure absorption panel composed of a plurality of concave portions and island portions on a body portion of a synthetic resin container, and the island portions are formed in a twin-knob shape with respect to the concave portions. Since the inversion of the island portion can be prevented, it is possible to provide a synthetic resin container having higher resistance to pressure changes in the container. Further, the island portion can be formed in a substantially bowl shape in plan view. Preferably, the island portion is formed such that the center portion has the lowest height from the concave portion and / or the circumferential width of the container is the narrowest. Furthermore, the length of the island portion in the height direction of the container is preferably 50 to 90% of the length of the vacuum absorption panel.

又、本発明は、前記減圧吸収パネルを離間するリブを前記容器の外方に向って円弧状にすることによって、該リブが、該容器内の圧力変化に伴って座屈することを防止できるため、該容器の該容器内の圧力変化に対する耐性をより高くすることができる。 Further, the present invention can prevent the rib from buckling due to the pressure change in the container by forming the rib separating the vacuum absorbing panel in an arc shape toward the outside of the container. The resistance of the container to a pressure change in the container can be further increased.

本発明の実施形態の斜視図である。It is a perspective view of the embodiment of the present invention. 本発明の実施形態の正面図である。It is a front view of the embodiment of the present invention. 図２のIII−III断面図である。FIG. 3 is a sectional view taken along line III-III in FIG. 2. 図２のIV−IV断面図である。It is IV-IV sectional drawing of FIG. 本発明の実施形態の側面図である。It is a side view of the embodiment of the present invention. 図５のVI−VI断面図である。It is VI-VI sectional drawing of FIG. 本発明の実施形態の平面図である。It is a top view of the embodiment of the present invention. 本発明の実施形態の減圧吸収パネルの略図であり、（ａ）は縦断面図に相当する図であり、（ｂ）は正面図に相当する図である。BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic of the reduced pressure absorption panel of embodiment of this invention, (a) is a figure equivalent to a longitudinal cross-sectional view, (b) is a figure equivalent to a front view. 比較例の斜視図である。It is a perspective view of a comparative example. 本発明の実施形態の抜き取り量と内圧値との関係を示す特性図である。It is a characteristic view which shows the relationship between the amount of extraction of embodiment of this invention, and an internal pressure value.

本発明の実施形態を図１乃至８より説明する。合成樹脂製容器１は、壜様の容器であり、首部２、肩部３、胴部４及び底部５により構成される。本実施の形態では、合成樹脂製容器１は、平面視略円状に形成され、ＰＥＴ樹脂で作成されている。尚、後述する本実施形態の構成は、壜様の容器１のみならず、他の形状の容器にも応用可能である。 An embodiment of the present invention will be described with reference to FIGS. The synthetic resin container 1 is a bowl-like container and includes a neck portion 2, a shoulder portion 3, a trunk portion 4 and a bottom portion 5. In the present embodiment, the synthetic resin container 1 is formed in a substantially circular shape in plan view and is made of PET resin. In addition, the structure of this embodiment mentioned later is applicable not only to the bowl-like container 1 but to containers of other shapes.

首部２には、容器１に充填された内容液を流通させるための口部６が形成されると共に首部２には中栓（図示省略）が装着される。 The neck portion 2 is formed with a mouth portion 6 for allowing the content liquid filled in the container 1 to flow, and the neck portion 2 is fitted with an inner plug (not shown).

肩部３は、首部２から胴部４へと橋絡する部分であり、本実施の形態では、該半球形状に形成される。 The shoulder portion 3 is a portion that bridges from the neck portion 2 to the trunk portion 4, and is formed in the hemispherical shape in the present embodiment.

本実施の形態において、底部５は、その中心部５ａが容器１の内方に向って突出している。尚、底部５の形状は適宜変更することができる。 In the present embodiment, the bottom portion 5 of the bottom portion 5 protrudes inward of the container 1. In addition, the shape of the bottom part 5 can be changed suitably.

胴部４には、その側面４ａに、容器１の高さ方向に延びるリブ８及びその側縁部７ａ，７ｂでリブ８と連続し、リブ８によって互いが離間されている複数の減圧吸収パネル７が形成されている。又、本実施の形態においては、胴部４は略円筒状に形成されている。 The body 4 has a plurality of reduced pressure absorption panels which are continuous with the ribs 8 extending in the height direction of the container 1 and the side edges 7a and 7b on the side surface 4a and separated from each other by the ribs 8. 7 is formed. Moreover, in this Embodiment, the trunk | drum 4 is formed in the substantially cylindrical shape.

リブ８は、容器１内の圧力変化（減圧）に対する強度を高くするため、容器１の外方に向って僅かに略円弧状に形成されている。このようにすることによって、容器１内の圧力変化（減圧）や容器１外部からの力によって、リブ８が座屈することを防止している。尚、リブ８は、略円弧状に形成せずに直線状に形成することもできる。 The rib 8 is formed in a substantially arc shape slightly toward the outside of the container 1 in order to increase the strength against pressure change (decompression) in the container 1. By doing so, the rib 8 is prevented from buckling due to a pressure change (decompression) in the container 1 or a force from the outside of the container 1. In addition, the rib 8 can also be formed in a linear shape without being formed in a substantially arc shape.

減圧吸収パネル７は、凹面部９及び島部１０により構成される。島部１０は、減圧吸収パネル７の容器１の周方向に対する中央部７ｃに、その全周が凹面部９によって囲まれるように且つ凹面部８に対して容器１の外方に向って凸状に形成されている。本実施の形態では、減圧吸収パネル７は凹面部９の面積をより広く確保するために平面視略方形状に形成されているが、その形状は平面視略楕円形状等に適宜変更することが可能である。 The reduced pressure absorption panel 7 includes a concave surface portion 9 and an island portion 10. The island part 10 is convex in the central part 7c with respect to the circumferential direction of the container 1 of the vacuum absorbing panel 7 so that the entire circumference is surrounded by the concave part 9 and toward the outside of the container 1 with respect to the concave part 8. Is formed. In the present embodiment, the reduced-pressure absorption panel 7 is formed in a substantially rectangular shape in plan view in order to secure a wider area of the concave surface portion 9, but the shape can be appropriately changed to a substantially elliptical shape in plan view. Is possible.

凹面部９は、容器１内の減圧を吸収することにより、容器１の座屈を防止するために形成されるものである。凹面部９はその面積が広い程、容器１内の減圧に対する容器１の強度をより保持することができるようになる。従って、減圧吸収パネル７はその数は可能な限り少ないことが好ましい。本実施の形態では、容器１が平面視円形状に形成されることを考慮しつつ、凹面部９の面積を広く確保するため、減圧吸収パネル７は６面形成されている。 The concave surface portion 9 is formed to prevent buckling of the container 1 by absorbing the reduced pressure in the container 1. The larger the area of the concave surface portion 9, the more the strength of the container 1 against the decompression in the container 1 can be maintained. Therefore, the number of the vacuum absorbing panels 7 is preferably as small as possible. In the present embodiment, in consideration of the fact that the container 1 is formed in a circular shape in plan view, six decompression absorption panels 7 are formed in order to ensure a wide area of the concave surface portion 9.

島部１０は、容器１内が減圧された際に、島部１０が容器１内方に向って凹むことにより、容器１内の減圧を吸収するために形成されるものであり、双瘤形状に形成される。又、島部１０は、凹面部９を支持することで、外力や容器内の圧力変化（減圧）により凹面部９が必要以上に変形することを防止し、凹面部９の上記機能をより高くする機能も有する。本発明において双瘤形状とは、例えば、図８（ａ）に示す様な形状であり、凹面部９からの高さｈ_ａ，ｈ_ｂが、その周囲よりも高くなる様に形成された２つの頂部１０ａ，１０ｂを有し、２つの頂部１０ａ，１０ｂが、その間に形成され、且つ、島部１０の中で凹面部９からの高さが最も低い谷部１０ｃを介して連続しており、谷部１０ｃが、凹面部９に対して、凹面部９よりも高い位置に形成されている形状を指す。 The island 10 is formed to absorb the reduced pressure in the container 1 by the depression of the island 10 toward the inside of the container 1 when the inside of the container 1 is depressurized. Formed. Moreover, the island part 10 supports the concave surface part 9, thereby preventing the concave surface part 9 from being deformed more than necessary due to an external force or a pressure change (decompression) in the container. It also has a function to The twin aneurysm shape in the present invention, for example, a shape such as shown in FIG. 8 (a), the height h _a of the concave portion _9, h _b was formed so as be higher than its surroundings 2 It has two top portions 10a and 10b, and the two top portions 10a and 10b are formed between the two top portions 10a and 10b, and are continuous through the valley portion 10c having the lowest height from the concave surface portion 9 in the island portion 10. The trough part 10c points out the shape currently formed in the position higher than the concave surface part 9 with respect to the concave surface part 9. FIG.

本実施の形態では、島部１０の頂部１０ａは島部１０の上端部１０ｄの近傍に、頂部１０ｂは島部１０の下端部１０ｅの近傍に各々形成され、そして、各々の凹面部９からの高さｈ_ａ及びｈ_ｂは略等しい。又、谷部１０ｃは、島部１０の中央部１０ｆに形成されている。つまり、島部１０は、２つの頂部１０ａ，１０ｂ及び中央部１０ｆの各々の高さが、ｈ_ａ≒ｈ_ｂ＞ｈ_ｃ＞０となる様に形成されている。（ｈ_ｃは中央部１０ｆの凹面部９からの高さである）。 In the present embodiment, the top portion 10 a of the island portion 10 is formed in the vicinity of the upper end portion 10 d of the island portion 10, and the top portion 10 b is formed in the vicinity of the lower end portion 10 e of the island portion 10, and from each concave surface portion 9. The heights h _a and h _b are substantially equal. Further, the valley portion 10 c is formed in the central portion 10 f of the island portion 10. That is, the island portion 10 is formed such that the heights of the two top portions 10a and 10b and the central portion 10f satisfy h _a ≈h _b > h _c > 0. (H _c is the height of the central portion 10f from the concave portion 9).

尚、２つの頂部１０ａ，１０ｂ及び中央部１０ｆの位置、面積、高さ等は、容器１の大きさ及び形状等に合わせ適宜変更することができ、凹面部９からの高さの異なる頂部１０ａ及び頂部１０ｂを形成してもよい。 Note that the position, area, height, and the like of the two top portions 10a, 10b and the central portion 10f can be appropriately changed according to the size, shape, etc. of the container 1, and the top portions 10a having different heights from the concave surface portion 9 can be obtained. And the top part 10b may be formed.

又、本実施の形態では、島部１０は平面視略瓢箪形状である。本発明において、瓢箪形状とは、例えば、図８（ｂ）に示す様な形状であり、上端部１０ｄ側から細部１０ｇに向けて徐々にその幅が細くなっていき、細部１０ｇを境に下端部１０ｅに向ってその幅が徐々に太くなっていく形状である。従って、細部１０ｇが最も幅が細くなっている箇所である。 In the present embodiment, the island portion 10 has a substantially bowl shape in plan view. In the present invention, the saddle shape is, for example, a shape as shown in FIG. 8B, and the width gradually decreases from the upper end 10d side toward the detail 10g, and the lower end with the detail 10g as a boundary. The width gradually increases toward the portion 10e. Therefore, the detail 10g is the place where the width is the narrowest.

本実施の形態では、島部１０の容器１の周方向対する平面視の幅は、上端部１０ｄ側では、その頂部１０ａの周方向の幅ｗ_ａが、その下端部１０ｅ側は、その頂部１０ｂの周方向の幅ｗ_ｂが最も太くなる様に且つｗ_ａとｗ_ｂが略等しくなるように形成される。又、細部１０ｇが中央部１０ｆにくる様に形成される。つまり、島部１０はｗ_ａ≒ｗ_ｂ＞ｗ_ｃ＞０となるように形成されている（ｗ_ｃは中央部１０ｆの周方向の幅である）。尚、島部１０は、平面視略方形状（ｗ_ａ≒ｗ_ｂ≒ｗ_ｃ）にすることもできる、又、必ずしもｗ_ａ≒ｗ_ｂでなくともよい。 In the present embodiment, the width of the island portion 10 in the plan view of the container 1 in the circumferential direction is such that the width w _{a in} the circumferential direction of the top portion 10a on the upper end portion 10d side, and the top portion 10b on the lower end portion 10e side. Are formed such that the width w _{b in} the circumferential direction is the largest and w _a and w _b are substantially equal. Further, the details 10g are formed so as to come to the central portion 10f. That is, the island portion 10 is formed so that w _a ≈w _b > w _c > 0 (w _c is the width in the circumferential direction of the central portion 10f). Note that the island portion 10 can have a substantially square shape (w _a ≈w _b ≈w _c ) in plan view, and is not necessarily limited to w _a ≈w _b .

減圧吸収パネル７において、凹面部９及び島部１０の平面視における面積比は、容器１の形状、大きさ等によって適宜決定することができる。しかしながら、島部１０の面積比が極端に大きく（凹面部９の面積比を極端に小さく）した場合、凹面部９の面積が小さくなりすぎて、凹面部９の有する上記機能が発揮されなくなる。逆に、凹面部９の面積比を極端に大きく（島部１０の面積比を極端に小さく）した場合、今度は、島部１０の有する上記機能は発揮されなくなることとなる。従って、凹面部９及び島部１０は適度に両機能が発揮されるような面積比で減圧吸収パネル７に形成される。本実施の形態では、凹面部９と島部１０の面積比は凡そ１：１となる様に形成されている。好適には、凹面部９と島部１０の面積比は、３：１〜１：２の範囲となる様に形成することが望ましい。 In the reduced pressure absorption panel 7, the area ratio of the concave surface portion 9 and the island portion 10 in a plan view can be appropriately determined depending on the shape, size, and the like of the container 1. However, when the area ratio of the island part 10 is extremely large (the area ratio of the concave surface part 9 is extremely small), the area of the concave surface part 9 becomes too small, and the function of the concave surface part 9 is not exhibited. On the contrary, when the area ratio of the concave surface portion 9 is extremely large (the area ratio of the island portion 10 is extremely small), the function of the island portion 10 is not exhibited this time. Therefore, the concave surface portion 9 and the island portion 10 are formed in the reduced pressure absorption panel 7 at an area ratio that can appropriately exhibit both functions. In the present embodiment, the concave portion 9 and the island portion 10 are formed so that the area ratio is about 1: 1. Preferably, the area ratio between the concave surface portion 9 and the island portion 10 is desirably formed in a range of 3: 1 to 1: 2.

又、島部１０は、その容器１の高さ方向の長さｌ_ａが短すぎても上記機能が発揮されなくなる。逆に、島部１０の長さｌ_ａが減圧吸収パネルの上縁部７ｄ及び下縁部７ｅに略接する位に長くすると、島部１０がリブ８の様な働きをしてしまい、島部１０の上記機能が発揮されないばかりでなく、凹面部９が細分化されるため、凹面部９の上記機能も減少することとなる。従って、島部１０の長さｌ_aは、減圧吸収パネル７の容器１の高さ方向の長さｌ_ｂの５０乃至９０％であることが好ましい。本実施の形態では、ｌ_a／ｌ_ｂ＝約８９％である。 Also, the island portion 10, the function can not be exhibited even if the length l _a of the height direction of the container 1 is too short. Conversely, if the length l _a of the island portion 10 is long in position to substantially contact with the upper edge 7d and lower portions 7e of the vacuum panels, the island portion 10 ends up acts like ribs 8, islands Not only the above-mentioned function 10 is not exhibited, but also the concave surface portion 9 is subdivided, so the above-mentioned function of the concave surface portion 9 is also reduced. Accordingly, the length l _a of the island portion 10 is preferably 50 to 90% of the length l _b of the height direction of the container 1 of the vacuum panels 7. In the present embodiment, l _a / l _b = about 89%.

次に、本実施の形態の具体的な効果について示す。後述の３種類のサンプルについて比較検討を行った。 Next, specific effects of the present embodiment will be described. A comparative study was conducted on the following three types of samples.

（実施例）本実施の形態の合成樹脂製容器１である。
（比較例１）本実施の形態と島部の形状及び厚さが異なる合成樹脂製容器１０１であり、島部１１０は、図９に示す様な略半円筒形状であり、減圧吸収パネル１０７は、実施例で示す合成樹脂製容器１の減圧吸収パネル７より薄肉に形成されている（以下、比較例１の凹面部を凹面部１０９と謂う）。
（比較例２）本実施の形態と島部の形状が異なる合成樹脂製容器２０１であり、島部２１０は、図９に示す様な略半円筒形状である（以下、比較例２の減圧吸収パネルを減圧吸収パネル２０７、同凹面部を凹面部２０９と謂う）。尚、島部２１０の厚さは実施例で示す合成樹脂製容器１の島部１０と略同じである。 (Example) A synthetic resin container 1 according to the present embodiment.
(Comparative example 1) This embodiment is a synthetic resin container 101 having a different shape and thickness of the island portion, the island portion 110 has a substantially semi-cylindrical shape as shown in FIG. These are formed thinner than the reduced pressure absorption panel 7 of the synthetic resin container 1 shown in the examples (hereinafter, the concave surface portion of Comparative Example 1 is referred to as the concave surface portion 109).
(Comparative Example 2) A synthetic resin container 201 having an island shape different from that of the present embodiment, and the island portion 210 has a substantially semi-cylindrical shape as shown in FIG. The panel is referred to as a reduced pressure absorption panel 207, and the concave surface portion is referred to as a concave surface portion 209). In addition, the thickness of the island part 210 is substantially the same as the island part 10 of the synthetic resin container 1 shown in the embodiment.

図１０に上記実施例及び比較例１及び２の抜き取り量（ml）に対する内圧値（kPa）との関係表すグラフを示す。又、表１に図１０のグラフより算出した各容器１，１０１，２０１が座屈した際の抜き取り量（ml）及びその内圧値（kPa）を示す。

FIG. 10 is a graph showing the relationship between the internal pressure value (kPa) with respect to the extraction amount (ml) of the above-mentioned Examples and Comparative Examples 1 and 2. Table 1 shows the amount of extraction (ml) and the internal pressure value (kPa) when the containers 1, 101, 201 are buckled, calculated from the graph of FIG.

図１０において、実施例の合成樹脂製容器１におけるグラフの傾きは、比較例１や比較例２の合成樹脂製容器１０１，２０１と比べて小さくなっていることがわかる。これは、実施例１が比較例１、比較例２に比べて減圧を吸収する能力が高いことを表している。 In FIG. 10, it can be seen that the slope of the graph in the synthetic resin container 1 of the example is smaller than that of the synthetic resin containers 101 and 201 of Comparative Example 1 and Comparative Example 2. This indicates that Example 1 has a higher ability to absorb reduced pressure than Comparative Example 1 and Comparative Example 2.

又、表１において、実施例の合成樹脂製容器１における抜き取り量は比較例１や比較例２の合成樹脂製容器１０１，２０１と比べて大きい値を示している。これは、実施例が比較例１、比較例２と比べて容器内の減圧によって容器が座屈し難いことを表している。 Further, in Table 1, the extraction amount in the synthetic resin container 1 of the example shows a larger value than the synthetic resin containers 101 and 201 of Comparative Example 1 and Comparative Example 2. This indicates that the container is less likely to buckle due to the reduced pressure in the container compared to Comparative Example 1 and Comparative Example 2.

以上のような減圧吸収パネル７を容器１の胴部４に形成することにより、本実施の形態の容器１は、上記の凹面部９の機能と島部１０の機能の両機能を発揮させることが可能であるため、容器１内の減圧に対して変形し難い。又、島部１０を上記のような形状に形成することによって、容器１内が減圧状態になった際や外部から応力が掛かった際に、島部１０の中央部１０ｆにその圧力が集中し、中央部１０ｆが初めに凹むことにより、島部１０が反転することを防止しながら、良好な減圧吸収機能を発揮することができる。 By forming the reduced pressure absorption panel 7 as described above in the body portion 4 of the container 1, the container 1 of the present embodiment exhibits both the functions of the concave surface portion 9 and the island portion 10. Therefore, it is difficult to deform with respect to the reduced pressure in the container 1. Further, by forming the island portion 10 in the shape as described above, when the inside of the container 1 is in a reduced pressure state or when stress is applied from the outside, the pressure is concentrated on the central portion 10f of the island portion 10. Since the central portion 10f is recessed first, it is possible to exhibit a good reduced pressure absorption function while preventing the island portion 10 from being inverted.

又、本実施の形態の容器１では、減圧吸収パネル７を離間しているリブ８を容器１の外方に向って僅かに円弧状にすることによって、リブ８の座屈を防止することができ、更に容器１内の減圧に対して変形し難くなっている。 Further, in the container 1 of the present embodiment, the rib 8 separating the decompression absorbing panel 7 is formed in a slightly arc shape toward the outside of the container 1 to prevent the rib 8 from buckling. Further, it is difficult to be deformed by the reduced pressure in the container 1.

従って、容器内の圧力変化に対する耐性がより高い合成樹脂製容器を提供することができる。
Therefore, it is possible to provide a synthetic resin container having higher resistance to pressure change in the container.

１合成樹脂製容器２首部３肩部
４胴部４ａ側面５底部
５ａ中心部５ｂ溝部６口部
７減圧吸収パネル７ａ側縁部７ｂ側縁部
７ｃ中央部７ｄ上縁部７ｅ下縁部
８リブ９凹面部１０島部
１０ａ頂部１０ｂ頂部１０ｃ谷部
１０ｄ上端部１０ｅ下端部１０ｆ中央部
１０ｇ細部１０１合成樹脂容器１０７減圧吸収パネル
１０９凹面部１１０島部２０１合成樹脂容器
２０７減圧吸収パネル２０９凹面部２１０島部 1 Synthetic resin container 2 Neck 3 Shoulder
4 trunk 4a side 5 bottom
5a center part 5b groove part 6 mouth part
7 Vacuum absorbing panel 7a Side edge 7b Side edge
7c Center part 7d Upper edge part 7e Lower edge part
8 Ribs 9 Concave parts 10 Island parts
10a top 10b top 10c trough
10d upper end 10e lower end 10f center
10g Details 101 Plastic container 107 Vacuum absorbing panel
109 Concave part 110 Island part 201 Synthetic resin container
207 Vacuum absorbing panel 209 Concave surface 210 Island

Claims

A synthetic resin container having a plurality of vacuum absorbing panels spaced apart by ribs on the body,
The rib extends in a height direction of the container;
The reduced pressure absorption panel is constituted by a concave portion and an island portion,
The island portion is formed in a convex shape facing outward with respect to the concave surface portion, and the entire circumference thereof is surrounded by the concave surface portion, and is formed in a generally saddle shape in plan view and in a bifurcated shape with respect to the concave surface portion. And has two tops, the tops being continuous through a central part formed between them,
The top part and the central part are formed in an arc shape in a longitudinal section,
The height of the island part from the concave surface part is formed so that the central part is the lowest, and the circumferential width of the container of the island part is formed so that the central part is the thinnest. A synthetic resin container characterized by being made .

The island portion has a length in the height direction of the container island portion, to claim 1, wherein a 50 to 90% of the length height direction of the container of the vacuum panels The synthetic resin container described.

The ribs, synthetic resin container according to claim 1 or 2, characterized in that a substantially arcuate shape toward the outside of the container.