JP6465664B2 - container - Google Patents

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JP6465664B2
JP6465664B2 JP2015009903A JP2015009903A JP6465664B2 JP 6465664 B2 JP6465664 B2 JP 6465664B2 JP 2015009903 A JP2015009903 A JP 2015009903A JP 2015009903 A JP2015009903 A JP 2015009903A JP 6465664 B2 JP6465664 B2 JP 6465664B2
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container
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groove
raised bottom
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修二 粕谷
修二 粕谷
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Mikasa Sangyo Co Ltd
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Description

本発明は、合成樹脂製の容器に関する。   The present invention relates to a synthetic resin container.

従来、この種の容器としては、図１１（Ａ）に示すように、容器の底部１０１に、円環状の脚部１０２と、脚部１０２に囲まれた上げ底部１０３とを有するものがある。上げ底部１０３は、脚部１０２の先端よりも上方に位置し、中央厚肉部１０４と複数の環状湾曲部１０５，１０６，１０７とを有している。   Conventionally, as this type of container, as shown in FIG. 11A, there is a container having an annular leg 102 and a raised bottom 103 surrounded by the leg 102 at the bottom 101 of the container. The raised bottom portion 103 is positioned above the tip of the leg portion 102 and has a central thick portion 104 and a plurality of annular curved portions 105, 106, and 107.

中央厚肉部１０４は上げ底部１０３の中央部に形成された平坦部である。また、環状湾曲部１０５，１０６，１０７はそれぞれ、中央厚肉部１０４の外周部と脚部１０２の内周部との間に形成されて、下方に円弧状に湾曲して突出している。   The central thick portion 104 is a flat portion formed in the central portion of the raised bottom portion 103. Each of the annular curved portions 105, 106, and 107 is formed between the outer peripheral portion of the central thick portion 104 and the inner peripheral portion of the leg portion 102, and projects downward in a circular arc shape.

これによると、温度が高い状態で内容物（液）を容器内に充填して密封した後、温度が低下して容器内が減圧状態になったとき、図１１（Ｃ）（Ｄ）に示すように、上げ底部１０３の中心側の環状湾曲部１０５から外周側の環状湾曲部１０７にかけて、上げ底部１０３の位置が容器１０８の内方にせり上がることで、上げ底部１０３の移動が緩やかになるとともに、上げ底部１０３を上方に移動させることができ、内圧変化に対応し得る。   According to this, after filling the container with the contents (liquid) in a high temperature state and sealing it, when the temperature drops and the inside of the container is depressurized, it is shown in FIGS. 11C and 11D. As described above, the position of the raised bottom portion 103 rises inward of the container 108 from the annular curved portion 105 on the center side of the raised bottom portion 103 to the annular curved portion 107 on the outer peripheral side, so that the movement of the raised bottom portion 103 becomes gentle. At the same time, the raised bottom portion 103 can be moved upward, which can cope with a change in internal pressure.

尚、図１１（Ａ）は容器が空の状態を示し、（Ｂ）は容器に高温の内容物を充填した直後の状態を示し、（Ｃ）（Ｄ）は充填後の減圧状態を示し、（Ｅ）は上記（Ａ）〜（Ｄ）を重ねた図である。上記のような合成樹脂製の容器は例えば下記特許文献１に記載されている。   11A shows a state where the container is empty, FIG. 11B shows a state immediately after the container is filled with high-temperature contents, and FIG. 11C shows a decompressed state after filling. (E) is the figure which overlapped said (A)-(D). The container made of synthetic resin as described above is described in Patent Document 1 below, for example.

特許第５２８６４９７号Japanese Patent No. 5286497

しかしながら上記の従来形式では、図１１（Ｃ）（Ｄ）に示すように、容器内が減圧状態になったとき、中央厚肉部１０４は容器の内方にせり上がるが、肉厚であるため、環状湾曲部１０５，１０６，１０７と比べて中央厚肉部１０４自体は変形し難い。また、各環状湾曲部１０５，１０６，１０７の曲率半径が小さいため、各環状湾曲部１０５，１０６，１０７自体も変形し難い。このように中央厚肉部１０４自体および各環状湾曲部１０５，１０６，１０７自体はそれぞれ変形し難いため、内圧の大きな変化に対応しようとする場合、上げ底部１０３の位置が容器１０８の内方にせり上がる際のせり上がり量を増大させる必要がある。しかしながら、このようなせり上がり量の増大には限度があるため、内圧の大きな変化に対応することは困難であるといった問題がある。   However, in the above conventional format, as shown in FIGS. 11C and 11D, when the inside of the container is in a decompressed state, the central thick portion 104 rises inward of the container, but is thick. Compared to the annular curved portions 105, 106, 107, the central thick portion 104 itself is not easily deformed. Moreover, since the curvature radius of each cyclic | annular bending part 105,106,107 is small, each cyclic | annular bending part 105,106,107 itself cannot change easily. As described above, the central thick portion 104 itself and the annular curved portions 105, 106, and 107 themselves are not easily deformed. Therefore, when trying to cope with a large change in internal pressure, the position of the raised bottom portion 103 is inward of the container 108. It is necessary to increase the amount of rising when rising. However, there is a problem in that it is difficult to cope with a large change in internal pressure because there is a limit to the increase in the amount of rising.

本発明は、内圧の大きな変化に対応することが可能な容器を提供することを目的とする。   An object of this invention is to provide the container which can respond to the big change of internal pressure.

上記目的を達成するために、本第１発明は、底部に、環状の脚部と、脚部に囲まれた上げ底部とを有する合成樹脂製の容器であって、
上げ底部は、脚部の先端よりも上方に位置して、中央山部と環状山部とを有しており、
中央山部は、上げ底部の中央部に形成されて、下方に円弧状に湾曲して突出しており、
環状山部は、中央山部の外周部と脚部の内周部との間に形成されて、下方に円弧状に湾曲して突出しており、
中央山部と環状山部との境界部分における上げ底部の外面に、容器の内側に向かって窪んだ環状谷部が形成され、
中央山部の曲率半径が環状山部の曲率半径よりも大きく、
上げ底部に、中央部から径方向外側に向かって放射状に延びる複数の溝が形成され、
溝は、中央山部に形成された第１溝部と、環状山部に形成された第２溝部とを有し、
第１および第２溝部はそれぞれ周方向の一方において円弧状に湾曲しており、
第１溝部の曲率半径が第２溝部の曲率半径よりも大きいものである。 In order to achieve the above object, the first aspect of the present invention is a synthetic resin container having an annular leg and a raised bottom surrounded by the leg at the bottom,
The raised bottom is located above the tip of the leg, and has a central peak and an annular peak.
The central mountain portion is formed in the central portion of the raised bottom portion, and is curved and protrudes downward in an arc shape.
The annular mountain part is formed between the outer peripheral part of the central mountain part and the inner peripheral part of the leg part, and is curved and protrudes downward in an arc shape,
On the outer surface of the raised bottom at the boundary between the central peak and the annular peak, an annular valley that is recessed toward the inside of the container is formed,
Curvature of the central mountain portion radius is much larger than the radius of curvature of the annular crests,
A plurality of grooves extending radially outward from the center portion are formed in the raised bottom portion,
The groove has a first groove portion formed in the central mountain portion and a second groove portion formed in the annular mountain portion,
Each of the first and second groove portions is curved in an arc shape on one side in the circumferential direction,
The radius of curvature of the first groove is larger than the radius of curvature of the second groove .

これによると、中央山部の曲率半径が環状山部の曲率半径よりも大きいため、中央山部の方が、環状山部よりも、容器の内側へ変形し易くなる。従って、容器内が減圧状態になった場合、上げ底部の中央山部の位置が容器の内方にせり上がるとともに、中央山部自体も上下方向に縮小して変形するため、容器の内圧の大きな変化に十分に対応することが可能である。
また、容器内が減圧状態になり、上げ底部の中央山部の位置が容器の内方にせり上がる際、溝が閉じるように変形することで、中央山部と環状山部とが容器の内側へ容易に変形する。このとき、第１溝部の曲率半径が第２溝部の曲率半径よりも大きいため、第１溝部の方が第２溝部よりも変形し易くなり、中央山部の方が環状山部よりもさらに変形し易くなる。これにより、容器内が減圧状態になって上げ底部の中央山部の位置が容器の内方にせり上がる際、中央山部自体が容易に変形するため、容器の内圧の大きな変化に十分に対応することが可能である。 According to this, since the curvature radius of the central mountain portion is larger than the curvature radius of the annular mountain portion, the central mountain portion is more easily deformed to the inside of the container than the annular mountain portion. Therefore, when the inside of the container is depressurized, the position of the central mountain portion of the raised bottom rises inward of the container, and the central mountain portion itself contracts and deforms in the vertical direction, so the internal pressure of the container is large. It is possible to respond sufficiently to changes.
Also, when the inside of the container is in a decompressed state and the position of the central mountain portion of the raised bottom rises inward of the container, the central mountain portion and the annular mountain portion are formed inside the container by deforming so that the groove is closed. Transforms easily into At this time, since the radius of curvature of the first groove portion is larger than that of the second groove portion, the first groove portion is more easily deformed than the second groove portion, and the central mountain portion is further deformed than the annular mountain portion. It becomes easy to do. As a result, when the inside of the container is depressurized and the position of the central peak at the bottom rises to the inside of the container, the central peak itself is easily deformed, so it can cope with large changes in the internal pressure of the container. Is possible.

本第２発明における容器は、環状谷部上の少なくとも１カ所に、容器の内側に向かって窪んだ凹部が形成され、
環状谷部は周方向において凹部により分断されているものである。 In the container according to the second aspect of the present invention, at least one location on the annular valley is formed with a recess that is recessed toward the inside of the container,
The annular trough is divided by a recess in the circumferential direction.

これによると、容器内が減圧状態になって上げ底部の中央山部の位置が容器の内方にせり上がる際、環状谷部に発生した応力は、環状谷部に沿って周方向に伝播しようとしても、凹部により断ち切られる。これにより、上げ底部が不正に変形するのを抑制することができ、特に、上げ底部の厚みが不均一な場合、上げ底部に不正な変形が発生し易いが、上記のような凹部を形成することによって、不正変形の発生が抑制される。   According to this, when the inside of the container is depressurized and the position of the central peak of the raised bottom rises inward of the container, the stress generated in the annular valley will propagate in the circumferential direction along the annular valley. However, it is cut off by the recess. Thereby, it is possible to prevent the raised bottom portion from being illegally deformed. In particular, when the thickness of the raised bottom portion is not uniform, unauthorized deformation is likely to occur in the raised bottom portion, but the above-described concave portion is formed. Thus, the occurrence of unauthorized deformation is suppressed.

以上のように本発明によると、容器内が減圧状態になった場合、上げ底部の中央山部の位置が容器の内方にせり上がるとともに、中央山部自体も変形するため、容器の内圧の大きな変化に十分に対応することが可能である。   As described above, according to the present invention, when the inside of the container is in a decompressed state, the position of the central mountain portion of the raised bottom portion rises inward of the container, and the central mountain portion itself is also deformed. It is possible to sufficiently cope with large changes.

本発明の第１の実施の形態における容器の図である。It is a figure of the container in the 1st Embodiment of this invention. 同、容器の底部の斜視図である。It is a perspective view of the bottom part of a container same as the above. 同、容器の底面図である。It is a bottom view of a container same as the above. 図３におけるＸ−Ｘ矢視図である。It is a XX arrow line view in FIG. 図３におけるＹ−Ｙ矢視図である。It is a YY arrow line view in FIG. 図３におけるＺ−Ｚ矢視図である。It is a ZZ arrow line view in FIG. 図５における凹部２５の拡大断面図である。It is an expanded sectional view of the recessed part 25 in FIG. 同、容器の底部の断面図であり、内部が減圧されて底部が変形した状態を示す。It is sectional drawing of the bottom part of a container, and shows the state which the inside was pressure-reduced and the bottom part deform | transformed. 同、容器の底部の断面図であり、内部がさらに減圧されて底部がさらに変形した状態を示す。It is sectional drawing of the bottom part of a container, and shows the state which the inside was further pressure-reduced and the bottom part deform | transformed further. 同、容器の底部の溝の断面図であり、溝が閉じる方向に変形した状態を示す。It is sectional drawing of the groove | channel of the bottom part of a container, and shows the state which deform | transformed in the direction which a groove | channel closes. 従来の容器の底部の断面図であり、内部が減圧されたときに底部が変形する様子を示す。It is sectional drawing of the bottom part of the conventional container, and shows a mode that a bottom part deform | transforms when the inside is pressure-reduced.

以下、本発明における実施の形態を、図面を参照して説明する。
（第１の実施の形態）
図１〜図４に示すように、１は例えばポリエチレンテレフタレート等の合成樹脂製の容器であり、この容器１は、円筒状の胴部２と、キャップ（図示省略）によって密封される口部４と、底部５とを有している。底部５には、円環状の脚部７と、脚部７に囲まれた円形状の上げ底部８とが備えられている。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
As shown in FIGS. 1 to 4, reference numeral 1 denotes a container made of synthetic resin such as polyethylene terephthalate, and the container 1 has a cylindrical body 2 and a mouth 4 sealed by a cap (not shown). And the bottom 5. The bottom part 5 is provided with an annular leg part 7 and a circular raised bottom part 8 surrounded by the leg part 7.

脚部７は、胴部２から連なる外周壁１０と、径方向内側から外周壁１０に対向する内周壁１１と、外周壁１０と内周壁１１との先端部間に設けられた接地部１２とを有している。   The leg portion 7 includes an outer peripheral wall 10 that continues from the trunk portion 2, an inner peripheral wall 11 that faces the outer peripheral wall 10 from the radially inner side, and a grounding portion 12 that is provided between the outer peripheral wall 10 and the distal end portion of the inner peripheral wall 11. have.

上げ底部８は、脚部７の接地部１２（先端）よりも上方に位置しており、中央山部１４と環状山部１５とを有している。中央山部１４は、上げ底部８の径方向における中央部に形成されて、下方に円弧状に湾曲して突出している。また、環状山部１５は、中央山部１４の外周部と脚部７の内周壁１１の上端部との間に全周にわたり形成されて、下方に円弧状に湾曲して突出している。   The raised bottom portion 8 is located above the ground contact portion 12 (tip) of the leg portion 7 and has a central mountain portion 14 and an annular mountain portion 15. The central mountain portion 14 is formed at the central portion in the radial direction of the raised bottom portion 8, and protrudes downward in a circular arc shape. The annular peak 15 is formed over the entire circumference between the outer peripheral part of the central peak part 14 and the upper end part of the inner peripheral wall 11 of the leg part 7, and projects downward in a circular arc shape.

中央山部１４と環状山部１５との境界部分における上げ底部８の外面には、容器１の内側に向かって窪んだ環状谷部１６が全周にわたり形成されている。図４に示すように、中央山部１４の曲率半径Ｒ１が環状山部１５の曲率半径Ｒ２よりも大きい。尚、中央山部１４の外面は曲率半径Ｒ１の球面の一部を成しているが、中央山部１４の中央部分の円形の所定領域Ａのみは平坦面１４ａとして形成されている。   On the outer surface of the raised bottom 8 at the boundary between the central peak 14 and the annular peak 15, an annular valley 16 that is recessed toward the inside of the container 1 is formed over the entire circumference. As shown in FIG. 4, the curvature radius R <b> 1 of the central mountain portion 14 is larger than the curvature radius R <b> 2 of the annular mountain portion 15. The outer surface of the central mountain portion 14 forms a part of a spherical surface having a radius of curvature R1, but only the circular predetermined area A in the central portion of the central mountain portion 14 is formed as a flat surface 14a.

上げ底部８の外面には、中央部から径方向外側に向かって放射状に延びる複数の溝２０が形成されている。各溝２０はそれぞれ、図６に示すように、断面が逆Ｖ形状の下方に開放された溝であり、中央山部１４に形成された第１溝部２１と、環状山部１５に形成された第２溝部２２とを有している。図２，図３に示すように、第１および第２溝部２１，２２はそれぞれ周方向の一方において円弧状に湾曲しており、第１溝部２１の曲率半径ｒ１が第２溝部２２の曲率半径ｒ２よりも大きい。尚、第１溝部２１と第２溝部２２とは環状谷部１６の箇所で連通している。   A plurality of grooves 20 extending radially outward from the center portion are formed on the outer surface of the raised bottom portion 8. As shown in FIG. 6, each groove 20 is a groove having an inverted V-shaped cross section and opened downward, and is formed in the first groove portion 21 formed in the central mountain portion 14 and the annular mountain portion 15. And a second groove portion 22. As shown in FIGS. 2 and 3, the first and second groove portions 21 and 22 are each curved in an arc shape in one circumferential direction, and the curvature radius r1 of the first groove portion 21 is the curvature radius of the second groove portion 22. Greater than r2. The first groove portion 21 and the second groove portion 22 communicate with each other at the annular valley portion 16.

図３，図５，図７に示すように、環状谷部１６上の複数箇所（図３では四箇所）には、容器１の内側に向かって窪んだ凹部２５が形成されている。各凹部２５の窪み具合（容器１の内側への窪み深さＤおよび径方向における窪み幅Ｗ）は環状谷部１６の窪み具合（容器１の内側への窪み深さおよび径方向における窪み幅）よりも大きく、環状谷部１６は周方向において凹部２５により分断されている。   As shown in FIGS. 3, 5, and 7, concave portions 25 that are recessed toward the inside of the container 1 are formed at a plurality of locations (four locations in FIG. 3) on the annular valley portion 16. Depression condition of each recess 25 (indentation depth D to the inside of the container 1 and depression width W in the radial direction) is a depression condition of the annular valley portion 16 (indentation depth to the inside of the container 1 and depression width in the radial direction). The annular valley portion 16 is divided by the recess 25 in the circumferential direction.

以下、上記構成における作用を説明する。
図４に示すように、中央山部１４の曲率半径Ｒ１が環状山部１５の曲率半径Ｒ２よりも大きいため、中央山部１４の方が、環状山部１５よりも、容器１の内側へ変形し易くなる。 Hereinafter, the operation of the above configuration will be described.
As shown in FIG. 4, since the curvature radius R <b> 1 of the central mountain portion 14 is larger than the curvature radius R <b> 2 of the annular mountain portion 15, the central mountain portion 14 is deformed inward of the container 1 rather than the annular mountain portion 15. It becomes easy to do.

温度が高い状態で内容液を容器１内に充填し、キャップを口部４に装着して容器１を密閉した後、シャワー水を容器１の外面に噴射して内容液を一定温度まで冷却する。このとき、内容液の温度が低下して容器１内が減圧状態となるが、図８，図９に示すように、中央山部１４の位置が容器１の内側にせり上がるとともに、中央山部１４自体も上下方向に縮小して変形するため、容器１の内圧の大きな変化に十分に対応することが可能である。尚、上記のように、中央山部１４自体も上下方向に縮小して変形することにより、環状谷部１６から中央山部１４の頂部までの距離Ｈが縮小する。   After the content liquid is filled in the container 1 in a high temperature state, the cap 1 is attached to the mouth part 4 and the container 1 is sealed, and then the shower liquid is sprayed on the outer surface of the container 1 to cool the content liquid to a certain temperature. . At this time, the temperature of the content liquid is lowered and the inside of the container 1 is in a decompressed state. As shown in FIGS. 8 and 9, the position of the central mountain portion 14 rises inside the container 1, and the central mountain portion 14 itself is also reduced and deformed in the vertical direction, and can sufficiently cope with a large change in the internal pressure of the container 1. As described above, the central mountain portion 14 itself is also reduced in the vertical direction and deformed, whereby the distance H from the annular valley portion 16 to the top portion of the central mountain portion 14 is reduced.

また、図８，図９に示すように、中央山部１４の位置が容器１の内側にせり上がる際、図１０に示すように、各溝２０が幅方向において閉じる方向Ｂに変形することで、中央山部１４と環状山部１５とが容器１の内側へ容易に変形する。このとき、溝２０は直線に近いほど上記閉じる方向Ｂに変形し易く、図３に示すように、第１溝部２１の曲率半径ｒ１が第２溝部２２の曲率半径ｒ２よりも大きいため、第１溝部２１の方が第２溝部２２よりも上記閉じる方向Ｂに変形し易くなる。これにより、中央山部１４の方が環状山部１５よりもさらに変形し易くなり、図８，図９に示すように、上げ底部８の中央山部１４の位置が容器１の内方にせり上がる際、中央山部１４自体が容易に変形するため、容器１の内圧の大きな変化に十分に対応することが可能である。   Further, as shown in FIGS. 8 and 9, when the position of the central mountain portion 14 rises inside the container 1, as shown in FIG. 10, each groove 20 is deformed in the closing direction B in the width direction. The central mountain portion 14 and the annular mountain portion 15 are easily deformed to the inside of the container 1. At this time, the closer the groove 20 is to a straight line, the easier it is to deform in the closing direction B. As shown in FIG. 3, the first groove portion 21 has a radius of curvature r1 larger than the radius of curvature r2 of the second groove portion 22. The groove portion 21 is more easily deformed in the closing direction B than the second groove portion 22. As a result, the central mountain portion 14 is more easily deformed than the annular mountain portion 15, and the position of the central mountain portion 14 of the raised bottom portion 8 is set inward of the container 1 as shown in FIGS. 8 and 9. Since the central mountain portion 14 itself is easily deformed when going up, it is possible to sufficiently cope with a large change in the internal pressure of the container 1.

さらに、中央山部１４の位置が容器１の内側にせり上がる際、環状谷部１６に発生した応力は、環状谷部１６に沿って周方向に伝播しようとしても、凹部２５により断ち切られる。これにより、上げ底部８が不正に変形するのを抑制することができ、特に、上げ底部８の厚みが不均一な場合、上げ底部８に不正な変形が発生し易いが、上記のような凹部２５を形成することによって、不正変形の発生が抑制される。   Further, when the position of the central mountain portion 14 rises to the inside of the container 1, the stress generated in the annular valley portion 16 is cut off by the concave portion 25 even if it tries to propagate in the circumferential direction along the annular valley portion 16. Accordingly, it is possible to prevent the raised bottom portion 8 from being illegally deformed. In particular, when the thickness of the raised bottom portion 8 is not uniform, the raised bottom portion 8 is likely to be illegally deformed. By forming 25, the occurrence of unauthorized deformation is suppressed.

尚、その後、容器１内の圧力が減圧状態から増加した場合、図８の実線から仮想線に示すように、中央山部１４の位置が容器１の内側から外側に向かって膨出する。
上記実施の形態では、図４に示すように、中央山部１４は、中央部分に平坦面１４ａを有しているが、平坦面１４ａを有していなくてもよい。 After that, when the pressure in the container 1 increases from the reduced pressure state, the position of the central mountain portion 14 bulges from the inside to the outside of the container 1 as shown by the phantom line from the solid line in FIG.
In the said embodiment, as shown in FIG. 4, although the center mountain part 14 has the flat surface 14a in the center part, it does not need to have the flat surface 14a.

上記実施の形態では、図３に示すように、溝２０を６本、凹部２５を四個形成しているが、これらの数に限定されるものではない。   In the above embodiment, as shown in FIG. 3, six grooves 20 and four recesses 25 are formed, but the number is not limited thereto.

１ 容器
５ 底部
７ 脚部
８ 上げ底部
１４ 中央山部
１５ 環状山部
１６ 環状谷部
２０ 溝
２１ 第１溝部
２２ 第２溝部
２５ 凹部
Ｒ１ 中央山部の曲率半径
Ｒ２ 環状山部の曲率半径
ｒ１ 第１溝部の曲率半径
ｒ２ 第２溝部の曲率半径 DESCRIPTION OF SYMBOLS 1 Container 5 Bottom part 7 Leg part 8 Raised bottom part 14 Central mountain part 15 Annular mountain part 16 Annular valley part 20 Groove 21 1st groove part 22 2nd groove part 25 Recess R1 The curvature radius R2 of an annular mountain part R1 The curvature radius r1 of an annular mountain part 1 radius of curvature r2 radius of curvature of the second groove

Claims (2)

底部に、環状の脚部と、脚部に囲まれた上げ底部とを有する合成樹脂製の容器であって、
上げ底部は、脚部の先端よりも上方に位置して、中央山部と環状山部とを有しており、
中央山部は、上げ底部の中央部に形成されて、下方に円弧状に湾曲して突出しており、
環状山部は、中央山部の外周部と脚部の内周部との間に形成されて、下方に円弧状に湾曲して突出しており、
中央山部と環状山部との境界部分における上げ底部の外面に、容器の内側に向かって窪んだ環状谷部が形成され、
中央山部の曲率半径が環状山部の曲率半径よりも大きく、
上げ底部に、中央部から径方向外側に向かって放射状に延びる複数の溝が形成され、
溝は、中央山部に形成された第１溝部と、環状山部に形成された第２溝部とを有し、
第１および第２溝部はそれぞれ周方向の一方において円弧状に湾曲しており、
第１溝部の曲率半径が第２溝部の曲率半径よりも大きいことを特徴とする容器。 A synthetic resin container having an annular leg and a raised bottom surrounded by the leg at the bottom,
The raised bottom is located above the tip of the leg, and has a central peak and an annular peak.
The central mountain portion is formed in the central portion of the raised bottom portion, and is curved and protrudes downward in an arc shape.
The annular mountain part is formed between the outer peripheral part of the central mountain part and the inner peripheral part of the leg part, and is curved and protrudes downward in an arc shape,
On the outer surface of the raised bottom at the boundary between the central peak and the annular peak, an annular valley that is recessed toward the inside of the container is formed,
Curvature of the central mountain portion radius is much larger than the radius of curvature of the annular crests,
A plurality of grooves extending radially outward from the center portion are formed in the raised bottom portion,
The groove has a first groove portion formed in the central mountain portion and a second groove portion formed in the annular mountain portion,
Each of the first and second groove portions is curved in an arc shape on one side in the circumferential direction,
The container characterized by the curvature radius of a 1st groove part being larger than the curvature radius of a 2nd groove part . 環状谷部上の少なくとも１カ所に、容器の内側に向かって窪んだ凹部が形成され、
環状谷部は周方向において凹部により分断されていることを特徴とする請求項１記載の容器。 A recess recessed toward the inside of the container is formed in at least one place on the annular valley,
The container according to claim 1, wherein the annular valley is divided by a recess in the circumferential direction.
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FR2382373A1 (en) * 1977-03-02 1978-09-29 Solvay HOLLOW BODY IN THERMOPLASTIC MATERIAL
JPS6055372B2 (en) * 1977-08-12 1985-12-04 大和製罐株式会社 Inflatable DI can bottom
JP4178531B2 (en) * 2002-09-30 2008-11-12 株式会社吉野工業所 The bottom structure of plastic container
US20110049083A1 (en) * 2009-09-01 2011-03-03 Scott Anthony J Base for pressurized bottles
US8444002B2 (en) * 2010-02-19 2013-05-21 Graham Packaging Lc, L.P. Pressure compensating bases for polymeric containers
JP5286497B1 (en) * 2011-11-18 2013-09-11 東洋製罐株式会社 Plastic container
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