JP2021079975A - Synthetic resin container - Google Patents

Synthetic resin container Download PDF

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JP2021079975A
JP2021079975A JP2019208268A JP2019208268A JP2021079975A JP 2021079975 A JP2021079975 A JP 2021079975A JP 2019208268 A JP2019208268 A JP 2019208268A JP 2019208268 A JP2019208268 A JP 2019208268A JP 2021079975 A JP2021079975 A JP 2021079975A
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leg
outer peripheral
peripheral surface
center
surface portion
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JP7400380B2 (en
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利佳 永春
Rika Nagaharu
利佳 永春
高規 岡部
Takanori Okabe
高規 岡部
秀彦 勝田
Hidehiko Katsuta
秀彦 勝田
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Toyo Seikan Group Holdings Ltd
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Toyo Seikan Kaisha Ltd
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Abstract

To more effectively suppress falling of a synthetic resin container having a bottom formed in a so-called petaloid shape.SOLUTION: A synthetic resin container has an outer peripheral surface part 52 in which legs 51 arranged on a bottom part 5 hang down from the upper end of the bottom part 5, whose length along a circumferential direction is narrowed on the lower end side while the lower end side curves inward of the container, and a leg bottom surface part 53 that is connected to the outer peripheral surface part 52 at the lowermost end of the bottom part 5 and is inclined upward from a connecting part 54 with the outer peripheral surface part 52 toward the center of the bottom part 5, a distance L from the center of the bottom part 5 to one end of the connecting part 54 is made longer than a distance L0 of the connecting part 54 between the outer peripheral surface part 52 and the leg bottom surface part 53 from the center of the bottom part 5 to the center of the connecting part 54 in a longitudinal direction.SELECTED DRAWING: Figure 3

Description

本発明は、合成樹脂製容器に関し、特に、炭酸飲料を内容物とする耐圧ボトルとしての用途に好適な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 suitable for use as a pressure-resistant bottle containing a carbonated drink as a content.

従来、ポリエチレンテレフタレートなどの熱可塑性樹脂を用いてプリフォームを形成し、次いで、このプリフォームを二軸延伸ブロー成形などによってボトル状に成形してなる合成樹脂製の容器が、各種飲料品等を内容物とする容器として広い分野で利用されている。 Conventionally, a container made of synthetic resin, which is formed by forming a preform using a thermoplastic resin such as polyethylene terephthalate and then molding this preform into a bottle shape by biaxial stretching blow molding or the like, is used for various beverages and the like. It is used in a wide range of fields as a container for contents.

このような合成樹脂製容器のうち、炭酸飲料を内容物とする飲料用容器にあっては、炭酸ガスによる圧力に耐え得る耐圧性を備えるとともに、容器内が陽圧になっても自立安定性が損なわれることなく、自立可能であることが要求される。このため、例えば、特許文献1が開示するような、いわゆるペタロイド形状に形成された底部を備える耐圧ボトルが知られている。 Among such synthetic resin containers, beverage containers containing carbonated beverages have pressure resistance that can withstand the pressure of carbon dioxide gas, and are self-sustaining stability even when the inside of the container becomes positive pressure. Is required to be able to stand on its own without being impaired. For this reason, for example, a pressure-resistant bottle having a bottom formed in a so-called petaloid shape, as disclosed in Patent Document 1, is known.

特開2013−112395号公報Japanese Unexamined Patent Publication No. 2013-12395

ところで、特許文献1では、ボトル軸を中心とする同一の仮想円に沿って接地部を延在させるとともに、それぞれの接地部がなすボトル軸を中心とした中心角の合計角度を規定しており、そのようにすることで、ボトルの全高に対する接地部の接地径の比を低く抑えても、転倒を抑制することができるとしている。 By the way, in Patent Document 1, the ground contact portion extends along the same virtual circle centered on the bottle shaft, and the total angle of the central angles formed by each ground contact portion around the bottle shaft is defined. By doing so, even if the ratio of the ground contact diameter of the ground contact portion to the total height of the bottle is kept low, the tipping can be suppressed.

しかしながら、本発明者らの検討によれば、特許文献1が開示する技術を適用しても、ボトルの転倒を抑制するには限界があることが見出された。 However, according to the studies by the present inventors, it has been found that there is a limit in suppressing the tipping of the bottle even if the technique disclosed in Patent Document 1 is applied.

すなわち、ボトルが転倒し難いか否かの指標として、転倒角が用いられるが、転倒角は、ボトルを正立させた面を傾けていったときに、ボトルが転倒する当該面の傾斜角度として求められる。ペタロイド形状に形成された底部を備える耐圧ボトルにあっては、隣接する脚部の間の方向に倒れ易いことから、隣接する脚部の間を等分する中心線が、当該面を傾ける軸に直交するようにボトルを正立させて、隣接する脚部の間の方向にボトルが転倒する当該面の傾斜角度を転倒角としており、その際、隣接する脚部のそれぞれの接地部の端部どうしを結ぶ線分を軸にボトルが転倒する。したがって、特許文献1のように、ボトル軸を中心とする同一の仮想円に沿って接地部を延在させたのでは、隣接する脚部のそれぞれの接地部の端部どうしを結ぶ線分が、接地径よりもボトル軸側に寄ってしまうため、ボトルの転倒を抑制するには限界があった。 That is, the overturning angle is used as an index of whether or not the bottle is difficult to overturn, and the overturning angle is used as the inclination angle of the surface on which the bottle falls when the surface on which the bottle is upright is tilted. Desired. In a pressure-resistant bottle having a petaloid-shaped bottom, it easily falls in the direction between adjacent legs, so the center line that equally divides the adjacent legs is the axis that tilts the surface. The bottles are erected so as to be orthogonal to each other, and the inclination angle of the surface on which the bottle falls in the direction between the adjacent legs is set as the tilt angle. The bottle falls around the line segment connecting the two. Therefore, as in Patent Document 1, if the ground contact portion is extended along the same virtual circle centered on the bottle axis, a line segment connecting the ends of the ground contact portions of the adjacent leg portions is formed. , Since it is closer to the bottle shaft side than the ground contact diameter, there is a limit to prevent the bottle from tipping over.

本発明者らは、このような知見に基づいて、さらなる検討を重ねた結果、本発明を完成するに至った。 The present inventors have completed the present invention as a result of repeated studies based on such findings.

本発明に係る合成樹脂製容器は、複数の脚部が中心軸周りに回転対称に、かつ、均等な間隔で放射状に配設された底部を備え、前記脚部は、前記底部の上端から垂下して、下端側が容器内方に湾曲しながら終端するとともに、周方向に沿った長さが下端側で狭められた外周面部と、前記底部の最下端で前記外周面部と連接し、前記外周面部との連接部から前記底部の中心に向かって上向きに傾斜する脚底面部とを有し、前記底部の中心から前記連接部の長手方向中央までの距離に対して、前記底部の中心から前記連接部の一端までの距離が長い構成としてある。 The synthetic resin container according to the present invention has a bottom portion in which a plurality of legs are rotationally symmetrically arranged around a central axis and radially arranged at equal intervals, and the leg portions hang down from the upper end of the bottom portion. Then, the lower end side is terminated while being curved inward of the container, and the outer peripheral surface portion whose length along the circumferential direction is narrowed on the lower end side is connected to the outer peripheral surface portion at the lowermost end of the bottom portion, and the outer peripheral surface portion is connected. It has a leg bottom portion that inclines upward from the connecting portion with the bottom toward the center of the bottom, and the connecting portion is from the center of the bottom with respect to the distance from the center of the bottom to the center of the connecting portion in the longitudinal direction. It is configured so that the distance to one end of is long.

本発明によれば、いわゆるペタロイド形状に形成された底部を備える合成樹脂製容器の転倒をより有効に抑制することができる。 According to the present invention, it is possible to more effectively suppress the tipping of a synthetic resin container having a bottom formed in a so-called petaloid shape.

本発明の実施形態に係る合成樹脂製容器の概略を示す正面図である。It is a front view which shows the outline of the synthetic resin container which concerns on embodiment of this invention. 本発明の実施形態に係る合成樹脂製容器の概略を示す背面図である。It is a back view which shows the outline of the synthetic resin container which concerns on embodiment of this invention. 本発明の実施形態に係る合成樹脂製容器の概略を示す拡大底面図である。It is an enlarged bottom view which shows the outline of the synthetic resin container which concerns on embodiment of this invention. 図1のA−A端面図である。It is the AA end view of FIG. 図1のB−B端面図である。It is a BB end view of FIG. 図1のC−C端面図である。It is a CC end view of FIG. 図3のD−D端面図である。It is a DD end view of FIG. 図3のE−E端面図である。FIG. 3 is an end view of EE of FIG. 図3のF−F端面図である。FIG. 3 is an FF end view of FIG. 図3のG−G端面図である。It is a GG end view of FIG. 図3のH−H端面図である。It is a HH end view of FIG. 図3のI−I端面図である。FIG. 3 is an I-I end view of FIG. 図7〜12を重ねて示す説明図である。It is explanatory drawing which shows FIGS. 7 to 12 superimposed. 図3の要部拡大図である。It is an enlarged view of the main part of FIG. 図3のJ−J端面図である。It is a JJ end view of FIG. 図3のK−K端面図である。It is a KK end view of FIG. 図15の要部拡大図である。It is an enlarged view of the main part of FIG. 図16の要部拡大図である。FIG. 16 is an enlarged view of a main part of FIG.

以下、本発明の好ましい実施形態について、図面を参照しつつ説明する。 Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

図1は、本実施形態に係る合成樹脂製容器の概略を示す正面図、図2は、同背面図であり、図3は、本実施形態に係る合成樹脂製容器の底面の概略を拡大して示す拡大底面図である。 FIG. 1 is a front view showing an outline of the synthetic resin container according to the present embodiment, FIG. 2 is a rear view of the same, and FIG. 3 is an enlarged outline of the bottom surface of the synthetic resin container according to the present embodiment. It is an enlarged bottom view shown by.

これらの図に示す容器1は、口部2、肩部3、胴部4、及び底部5を備えており、胴部4が概ね円筒状に形成された、一般に、丸形ボトルと称される容器形状を有している。
なお、図1及び図2では、胴部4の一部を省略している。
The container 1 shown in these figures includes a mouth portion 2, a shoulder portion 3, a body portion 4, and a bottom portion 5, and the body portion 4 is formed in a substantially cylindrical shape, and is generally referred to as a round bottle. It has a container shape.
In addition, in FIG. 1 and FIG. 2, a part of the body portion 4 is omitted.

このような容器1は、熱可塑性樹脂を使用して射出成形や圧縮成形などにより有底筒状のプリフォームを成形し、このプリフォームを二軸延伸ブロー成形などにより所定の容器形状に成形することによって製造される。 In such a container 1, a bottomed tubular preform is formed by injection molding, compression molding, or the like using a thermoplastic resin, and this preform is formed into a predetermined container shape by biaxial stretching blow molding or the like. Manufactured by

容器1を製造するにあたり、使用する熱可塑性樹脂としては、ブロー成形が可能な任意の樹脂を使用することができる。具体的には、ポリエチレンテレフタレート,ポリブチレンテレフタレート,ポリエチレンナフタレート,非晶ポリアリレート,ポリ乳酸,ポリエチレンフラノエート又はこれらの共重合体などの熱可塑性ポリエステル,これらの樹脂あるいは他の樹脂とブレンドされたものなどが好適である。特に、ポリエチレンテレフタレートなどのエチレンテレフタレート系熱可塑性ポリエステルが、好適に使用される。また、ポリカーボネート,アクリロニトリル樹脂,ポリプロピレン,プロピレン−エチレン共重合体,ポリエチレンなども使用することができる。 As the thermoplastic resin used in manufacturing the container 1, any resin capable of blow molding can be used. Specifically, it was blended with thermoplastic polyesters such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, acrylate polyarylate, polylactic acid, polyethylene furanoate or copolymers thereof, these resins or other resins. Those are suitable. In particular, ethylene terephthalate-based thermoplastic polyesters such as polyethylene terephthalate are preferably used. Further, polycarbonate, acrylonitrile resin, polypropylene, propylene-ethylene copolymer, polyethylene and the like can also be used.

口部2は、内容物の注ぎ口となる円筒状の部位であり、かかる口部2には、容器内を密封する図示しない蓋体が取り付けられる。
また、口部2の下端は、胴部4に向かって円錐台状に拡径して口部2と胴部4との間をつなぐ肩部3に連接している。
The mouth portion 2 is a cylindrical portion that serves as a spout for the contents, and a lid (not shown) that seals the inside of the container is attached to the mouth portion 2.
Further, the lower end of the mouth portion 2 is connected to the shoulder portion 3 connecting the mouth portion 2 and the body portion 4 by expanding the diameter toward the body portion 4 in a truncated cone shape.

胴部4は、容器1の高さ方向の大半を占める部位であり、上端が肩部3に連接し、下端が底部5に連接している。 The body portion 4 occupies most of the height direction of the container 1, and the upper end is connected to the shoulder portion 3 and the lower end is connected to the bottom portion 5.

ここで、高さ方向とは、口部2を上にして容器1を水平面に正立させたときに、水平面に直交する方向をいうものとし、この状態(図1に示す状態)で容器1の上下左右及び縦横の方向を規定するものとする。
また、図1に、符号Cで中心軸を示しているが、特に断りのない限り、中心軸Cを含む面で切断した断面を縦断面、中心軸Cに直交する面で切断した断面を横断面というものとする。
Here, the height direction means a direction orthogonal to the horizontal plane when the container 1 is upright on the horizontal plane with the mouth portion 2 facing up, and the container 1 is in this state (the state shown in FIG. 1). The vertical and horizontal directions and the vertical and horizontal directions of the above shall be specified.
Further, although the central axis is indicated by reference numeral C in FIG. 1, unless otherwise specified, a cross section cut along a plane including the central axis C is crossed over a vertical cross section and a cross section cut along a plane orthogonal to the central axis C. Let's call it a face.

本実施形態において、容器1は、炭酸飲料を内容物とする耐圧ボトルとして好適に利用できるように構成される。そのため、容器内が陽圧になっても自立安定性が損なわれないように、複数(図示する例では、五つ)の脚部51が中心軸C周りに回転対称に、かつ、均等な間隔で放射状に配設された、いわゆるペタロイド形状の底部5を備えている。 In the present embodiment, the container 1 is configured to be suitably used as a pressure-resistant bottle containing a carbonated drink as a content. Therefore, a plurality of legs 51 (five in the illustrated example) are rotationally symmetrical and evenly spaced around the central axis C so that the self-sustaining stability is not impaired even if the inside of the container becomes positive pressure. It is provided with a so-called petaloid-shaped bottom portion 5 arranged radially in the above.

このような形状とされた底部5において、その中央部は、容器内方にドーム状に窪んだ底板部50とされ、この底板部50の周囲に脚部51が配設されている。そして、隣接する脚部51の間には、最深部の縦断面が容器外方に凸の円弧状となるように、容器内方に嵌入してなる底溝部56が、底板部50の周縁から放射状に延在するようにして形成されている。換言すれば、底板部50の周囲に配設された脚部51は、底溝部56の最深部を母線とする中心軸C周りの回転面からなる概ね半球状の仮想面から、周方向に沿って所定の間隔で部分的に膨出するようにして形成されている。 In the bottom portion 5 having such a shape, the central portion thereof is a bottom plate portion 50 recessed in a dome shape inward of the container, and leg portions 51 are arranged around the bottom plate portion 50. Then, between the adjacent leg portions 51, a bottom groove portion 56 fitted into the inside of the container so that the vertical cross section of the deepest portion has a convex arc shape outward from the container is formed from the peripheral edge of the bottom plate portion 50. It is formed so as to extend radially. In other words, the leg portion 51 arranged around the bottom plate portion 50 is along the circumferential direction from a substantially hemispherical virtual surface composed of a rotating surface around the central axis C having the deepest portion of the bottom groove portion 56 as a generatrix. It is formed so as to partially bulge at predetermined intervals.

脚部51は、胴部4と連接する底部5の上端から垂下(図示する例では、容器内方にやや傾斜しながら垂下)して、下端側が容器内方に湾曲しながら終端するとともに、周方向に沿った長さ(横幅)が下端側で狭められた外周面部52を有している。かかる外周面部52の周方向両端縁は、底溝部56に向かって滑らかに湾曲しながら連続する側面部55に連接している。 The leg portion 51 hangs down from the upper end of the bottom portion 5 that is in contact with the body portion 4 (in the illustrated example, hangs down while slightly inclining inward of the container), and the lower end side is curved inward of the container to terminate the circumference. It has an outer peripheral surface portion 52 whose length (horizontal width) along the direction is narrowed on the lower end side. Both edges of the outer peripheral surface portion 52 in the circumferential direction are connected to the continuous side surface portion 55 while being smoothly curved toward the bottom groove portion 56.

外周面部52の横幅は、脚部51の上端側において、外周面部52の周方向両端縁が、外周面部52の周方向中央に向かって左右対称に弧を描くようにして徐々に狭められながら、少なくとも脚部51の高さHの1/2よりも下端側の部位における横幅Wが、脚部51の上端における横幅Wの15〜50%となるように狭められているのが好ましい。 The lateral width of the outer peripheral surface portion 52 is gradually narrowed on the upper end side of the leg portion 51 so that both edges of the outer peripheral surface portion 52 in the circumferential direction form an arc symmetrically toward the center in the circumferential direction of the outer peripheral surface portion 52. It is preferable that the width W at the lower end side of at least 1/2 of the height H of the leg 51 is narrowed so as to be 15 to 50% of the width W 0 at the upper end of the leg 51.

このようにすることで、外周面部52の周方向両端縁に連接する側面部55が、より大きな曲率半径を以て滑らかに湾曲しながら底溝部56に連続するように脚部51を形成することが可能になる。脚部51がこのように形成されるようにすることで、ブロー成形時の賦形性が良好になることに加え、容器1に炭酸飲料が内容物として充填、密封され、容器内が陽圧になった際に、底部5の内面側に加わる圧力に起因する応力亀裂を抑制することもできる。 By doing so, it is possible to form the leg portion 51 so that the side surface portion 55 connected to both peripheral edges of the outer peripheral surface portion 52 in the circumferential direction is continuous with the bottom groove portion 56 while being smoothly curved with a larger radius of curvature. become. By forming the legs 51 in this way, in addition to improving the shapeability at the time of blow molding, the container 1 is filled with a carbonated beverage as a content and sealed, and the inside of the container is positively pressured. It is also possible to suppress stress cracks caused by the pressure applied to the inner surface side of the bottom portion 5 at the time of becoming.

側面部55が、より滑らかに湾曲しながら底溝部56に連続するように脚部51を形成する上で、側面部55の外周面部52に連接する端縁部(以下、「側面端縁部」という)55aは、横断面が、外周面部52よりも曲率半径が小さい容器外方に凸の円弧状に形成されているのが好ましい(図4〜図6参照)。少なくとも脚部51の高さHの1/2よりも下端側の部位において、側面端縁部55aの曲率半径が、同じ横断面における外周面部52の曲率半径の10〜50%であるのがより好ましい。 In forming the leg portion 51 so that the side surface portion 55 curves more smoothly and continues to the bottom groove portion 56, the end edge portion (hereinafter, "side surface edge portion") connected to the outer peripheral surface portion 52 of the side surface portion 55. 55a preferably has a cross section formed in an arc shape that is convex outward of the container having a radius of curvature smaller than that of the outer peripheral surface portion 52 (see FIGS. 4 to 6). At least at a portion on the lower end side of the height H of the leg portion 51 on the lower end side, the radius of curvature of the side edge portion 55a is 10 to 50% of the radius of curvature of the outer peripheral surface portion 52 in the same cross section. preferable.

ここで、外周面部52の横断面における曲率半径は、底部5の上端(すなわち、胴部4の下端)の横断面における曲率半径と概ね等しく、横断面において曲率が変化する部位を外周面部52と側面部55との境界とする。
また、底溝部56の上端縁を周方向に延長してつないだ部位を胴部4と底部5との境界とする。
Here, the radius of curvature in the cross section of the outer peripheral surface portion 52 is substantially equal to the radius of curvature in the cross section of the upper end of the bottom portion 5 (that is, the lower end of the body portion 4), and the portion where the curvature changes in the cross section is referred to as the outer peripheral surface portion 52. It is a boundary with the side surface portion 55.
Further, a portion where the upper end edge of the bottom groove portion 56 is extended in the circumferential direction and connected is defined as a boundary between the body portion 4 and the bottom portion 5.

なお、図4は、図1のA−A端面図、図5は、図1のB−B端面図、図6は、図1のC−C端面図である。これらの図では、横断面における底部5の端面を、肉厚を省略して示しており、中心から延びる補助線(鎖線)で、外周面部52と側面部55との境界を示している。 4 is an AA end view of FIG. 1, FIG. 5 is a BB end view of FIG. 1, and FIG. 6 is a CC end view of FIG. In these figures, the end surface of the bottom portion 5 in the cross section is shown with the wall thickness omitted, and the boundary between the outer peripheral surface portion 52 and the side surface portion 55 is indicated by an auxiliary line (chain line) extending from the center.

また、脚部51は、その最下端で外周面部52と連接し、外周面部52との連接部54から底部5の中心に向かって上向きに傾斜する脚底面部53を有している。 Further, the leg portion 51 has a leg bottom surface portion 53 that is connected to the outer peripheral surface portion 52 at the lowermost end thereof and is inclined upward from the connecting portion 54 with the outer peripheral surface portion 52 toward the center of the bottom portion 5.

脚底面部53は、少なくとも底部5の中心側の部位において、底部5の中心を通って脚底面部53を周方向に等分する中心線と中心軸Cとを含む面に直交し、かつ、中心軸Cに平行な面で切断した断面が、容器外方に凸の円弧状に形成されているのが好ましい。当該断面は、それ以外の部位では直線状に形成されているのが好ましく、脚底面部53は、当該断面において容器内方に凸となる部位が存在しないように形成するのが好ましい(図7〜図13参照)。 The sole portion 53 is orthogonal to a plane including a center line and a central axis C that equally divides the leg bottom portion 53 in the circumferential direction through the center of the bottom portion 5 at least at a portion on the center side of the bottom portion 5, and is a central axis. It is preferable that the cross section cut on the plane parallel to C is formed in an arc shape that is convex outward of the container. The cross section is preferably formed in a straight line in other portions, and the leg bottom portion 53 is preferably formed so that there is no convex portion inward of the container in the cross section (FIGS. 7 to 7 to 7). See FIG. 13).

なお、図7は、図3のD−D端面図、図8は、図3のE−E端面図、図9は、図3のF−F端面図、図10は、図3のG−G端面図、図11は、図3のH−H端面図、図12は、図3のI−I端面図、図13は、図7〜図12を重ねて示す説明図である。これらの図では、底部5の中心を通って脚底面部53を周方向に等分する中心線と中心軸Cとを含む面に直交し、かつ、中心軸Cに平行な面で切断した脚底面部53を含む端面を、肉厚を省略して示している。 7 is a DD end view of FIG. 3, FIG. 8 is an EE end view of FIG. 3, FIG. 9 is an FF end view of FIG. 3, and FIG. 10 is a GG of FIG. G end view, FIG. 11 is an HH end view of FIG. 3, FIG. 12 is an II end view of FIG. 3, and FIG. 13 is an explanatory view showing FIGS. 7 to 12 superimposed. In these figures, the sole portion cut along the plane including the center line and the central axis C that equally divides the leg bottom portion 53 in the circumferential direction through the center of the bottom portion 5 and is parallel to the center axis C. The end face including 53 is shown with the wall thickness omitted.

このようにすることで、容器1に炭酸飲料が内容物として充填、密封され、容器内が陽圧になった際に、脚底面部53の中心側の部位への応力集中を避けて、当該部位及びその近傍における応力亀裂をより有効に抑制することができる。 By doing so, when the container 1 is filled and sealed with the carbonated beverage as the content and the inside of the container becomes positive pressure, stress concentration on the central side portion of the leg bottom portion 53 is avoided and the portion concerned is avoided. Stress cracks in and in the vicinity thereof can be suppressed more effectively.

本実施形態において、外周面部52と脚底面部53との連接部54は、底部5の中心から連接部54の長手方向中央までの距離Lに対して、底部5の中心から連接部54の一端までの距離Lが長い線状(図示する例では、概ね直線状)に形成されている(図3参照)。連接部54の長さは、連接部54における外周面部52の横幅に等しい。 In this embodiment, the connecting portion 54 between the outer peripheral surface portion 52 and the leg bottom section 53, with respect to the distance L 0 from the center of the bottom 5 to the longitudinal center of the connecting portion 54, one end of the connecting portion 54 from the center of the bottom 5 The distance L to the distance L is formed in a long linear shape (generally straight in the illustrated example) (see FIG. 3). The length of the connecting portion 54 is equal to the width of the outer peripheral surface portion 52 of the connecting portion 54.

このようにすることで、容器1を正立させたときに、外周面部52と脚底面部53との連接部54に沿って脚部51が接地する。その際、連接部54に沿った部分が接地部となり、隣接する脚部51の接地部の端部どうしを結ぶ線分が、底部5の中心から径方向外側により離れて位置することになる(図14参照)。 By doing so, when the container 1 is erected, the leg portion 51 comes into contact with the ground along the connecting portion 54 between the outer peripheral surface portion 52 and the leg bottom surface portion 53. At that time, the portion along the connecting portion 54 becomes the ground contact portion, and the line segment connecting the ends of the ground contact portions of the adjacent leg portions 51 is located radially outward from the center of the bottom portion 5 ( See FIG. 14).

なお、図14は、図3の鎖線で囲む部分を拡大して示す要部拡大図であり、連接部54に沿った接地部となる部分を網掛けで示し、接地部の端部どうしを結ぶ線分を鎖線αで示している。 Note that FIG. 14 is an enlarged view of a main part surrounded by a chain line in FIG. 3, in which a portion to be a grounding portion along the connecting portion 54 is shaded and the ends of the grounding portions are connected to each other. The line segment is indicated by the chain line α.

ペタロイド形状に形成された底部5を備える容器1は、隣接する脚部51の間の方向に倒れ易く、隣接する脚部51のそれぞれの接地部の端部どうしを結ぶ線分を軸に転倒することから、当該線分が底部5の中心に近いほど、容器1は転倒し易い。したがって、本実施形態によれば、隣接する脚部51の接地部の端部どうしを結ぶ線分が、底部5の中心から径方向外側により離れて位置することになるため、容器1の転倒をより有効に抑制することができる。
本実施形態は、容器1が、比較的細身で重心位置が高い場合に、そのような容器1の転倒を抑制するのに特に好適である。
The container 1 having the bottom portion 5 formed in a petaloid shape easily falls in the direction between the adjacent legs 51, and falls around the line segment connecting the ends of the respective ground contact portions of the adjacent legs 51. Therefore, the closer the line segment is to the center of the bottom portion 5, the easier it is for the container 1 to tip over. Therefore, according to the present embodiment, the line segment connecting the ends of the ground contact portions of the adjacent leg portions 51 is located farther from the center of the bottom portion 5 in the radial direction, so that the container 1 can be overturned. It can be suppressed more effectively.
This embodiment is particularly suitable for suppressing the tipping of the container 1 when the container 1 is relatively slender and the position of the center of gravity is high.

また、容器1に炭酸飲料が内容物として充填、密封され、容器内が陽圧になった際に、底部5の内面側には圧力が加わる。この底部5の内面側に加わる圧力によって、脚部51の脚底面部53が押し下げられるように変形するなどして、連接部54に沿って脚部51が接地しなくなり、接地部が底部5の中心側に寄ってしまうのは、容器1の転倒を抑制する上で好ましくない。 Further, when the container 1 is filled with a carbonated beverage as a content and sealed and the inside of the container becomes positive pressure, pressure is applied to the inner surface side of the bottom portion 5. The pressure applied to the inner surface side of the bottom portion 5 deforms the leg bottom portion 53 of the leg portion 51 so as to be pushed down, so that the leg portion 51 does not touch the ground along the connecting portion 54, and the ground contact portion is at the center of the bottom portion 5. It is not preferable to move to the side in order to prevent the container 1 from tipping over.

内容物を充填、密封する前後で、容器1の転倒を同等に抑制できるようにする上で、図15〜図18に示すように、容器内方に湾曲しながら終端する外周面部52の下端側の端縁部(以下、「外周面端縁部」という)52aは、縦断面が、連接部54における接線が中心軸Cと垂直に交わる容器外方に凸の円弧状に形成されているのが好ましく、その曲率半径は、0.5〜12mmであるのが好ましく、2〜6mmであるのがより好ましい。一方、外周面部52との連接部54に連なる脚底面部53の端縁部(以下、「脚底面端縁部」という)53aは、縦断面が、連接部54における接線が中心軸Cと垂直に交わり、かつ、外周面端縁部52aよりも曲率半径が小さい容器外方に凸の円弧状に形成されているのが好ましく、その曲率半径は、0.5〜12mmであるのが好ましく、1〜4mmであるのがより好ましい。
外周面端縁部52aの縦断面における曲率半径が大きくなるほど、より底部5の中心側に寄った位置に連接部54が形成される。このため、外周面端縁部52aの縦断面における曲率半径が大き過ぎるのは、自立安定性の観点から好ましくない。一方、外周面端縁部52aと脚底面端縁部53aのそれぞれの縦断面における曲率半径が小さくなるほど、賦形不良が生じ易くなる傾向にある。このため、外周面端縁部52aと脚底面端縁部53aのそれぞれの縦断面における曲率半径が小さ過ぎると、延伸不足により耐圧強度に劣ってしまう虞がある。
As shown in FIGS. 15 to 18, in order to equally suppress the tipping of the container 1 before and after filling and sealing the contents, the lower end side of the outer peripheral surface portion 52 that terminates while curving inward in the container. The edge portion (hereinafter referred to as “outer peripheral surface edge portion”) 52a has a vertical cross section formed in an arc shape that is convex outward of the container in which the tangent line at the connecting portion 54 intersects the central axis C perpendicularly. The radius of curvature is preferably 0.5 to 12 mm, more preferably 2 to 6 mm. On the other hand, the end edge portion (hereinafter referred to as "leg bottom surface edge portion") 53a of the leg bottom surface portion 53 connected to the connecting portion 54 with the outer peripheral surface portion 52 has a vertical cross section in which the tangent line at the connecting portion 54 is perpendicular to the central axis C. It is preferably formed in an arc shape that intersects and is convex outward of the container having a radius of curvature smaller than that of the outer peripheral surface edge portion 52a, and the radius of curvature is preferably 0.5 to 12 mm. More preferably, it is ~ 4 mm.
The larger the radius of curvature in the vertical cross section of the outer peripheral surface edge portion 52a, the more the connecting portion 54 is formed at a position closer to the center side of the bottom portion 5. Therefore, it is not preferable from the viewpoint of self-supporting stability that the radius of curvature in the vertical cross section of the outer peripheral surface edge portion 52a is too large. On the other hand, the smaller the radius of curvature in each vertical cross section of the outer peripheral surface edge portion 52a and the leg bottom surface edge portion 53a, the more likely it is that shaping defects will occur. Therefore, if the radius of curvature in each of the vertical cross sections of the outer peripheral surface edge portion 52a and the leg bottom surface edge portion 53a is too small, the pressure resistance strength may be inferior due to insufficient stretching.

なお、図15は、図3のJ−J端面図、図16は、図3のK−K端面図であり、それぞれ縦断面における脚部51を含む端面を、肉厚を省略して示している。図17は、図15の鎖線で囲む部分を拡大して示す要部拡大図、図18は、図16の鎖線で囲む部分を拡大して示す要部拡大図である。 15 is a JJ end view of FIG. 3, and FIG. 16 is a KK end view of FIG. 3, respectively, showing the end faces including the legs 51 in the vertical cross section, omitting the wall thickness. There is. FIG. 17 is an enlarged view of a main part surrounded by a chain line in FIG. 15, and FIG. 18 is an enlarged view of a main part showing an enlarged part surrounded by a chain line in FIG.

このようにすることで、底部5の内面側に加わる圧力によって、外周面部52と脚底面部53との連接部54の周辺、特に、その脚底面部53側が、押し下げられるように変形してしまうのを抑制することができる。その結果、内容物を充填、密封した後も概ね同様に、容器1を正立させたときに、連接部54に沿った部分が接地部となり、接地部が底部5の中心側に寄ってしまうのを抑制することができる。 By doing so, the pressure applied to the inner surface side of the bottom portion 5 prevents the periphery of the connecting portion 54 between the outer peripheral surface portion 52 and the leg bottom surface portion 53, particularly the leg bottom surface portion 53 side, from being deformed so as to be pushed down. It can be suppressed. As a result, even after the contents are filled and sealed, when the container 1 is erected, the portion along the connecting portion 54 becomes the ground contact portion, and the ground contact portion approaches the center side of the bottom portion 5. Can be suppressed.

また、本実施形態において、脚部51の脚底面部53は、連接部54側の脚底面端縁部53aに連なる傾斜面部53bを有している。
底部5の内面側に加わる圧力によって、連接部54の周辺が押し下げられるように変形してしまうのを抑制する上で、傾斜面部53bは、縦断面が、少なくとも脚底面端縁部53aに連なる側において、容器内方に凸の円弧状とされるのが好ましく、その曲率半径は、15mm以上であるのが好ましい。さらに、傾斜面部53bは、脚底面端縁部53aとの交点で、それぞれに接する接線が一致するように脚底面端縁部53aと滑らかに連続するように形成されているのが好ましい。
なお、傾斜面部53bの縦断面は、少なくとも脚底面端縁部53aに連なる側において、容器内方に凸の円弧状になっていれば、概ね直線状になっていてもよい。
Further, in the present embodiment, the leg bottom surface portion 53 of the leg portion 51 has an inclined surface portion 53b connected to the leg bottom surface end edge portion 53a on the connecting portion 54 side.
In order to prevent the periphery of the connecting portion 54 from being deformed so as to be pushed down by the pressure applied to the inner surface side of the bottom portion 5, the inclined surface portion 53b is on the side where the vertical cross section is at least connected to the bottom edge portion 53a of the leg. In the above, it is preferable that the shape of the arc is convex inward of the container, and the radius of curvature thereof is preferably 15 mm or more. Further, it is preferable that the inclined surface portion 53b is formed so as to be smoothly continuous with the leg bottom end edge portion 53a at the intersection with the leg bottom end edge portion 53a so that the tangents in contact with each of the inclined surface portions 53b coincide with each other.
The vertical cross section of the inclined surface portion 53b may be substantially linear as long as it has a convex arc shape inward of the container, at least on the side connected to the bottom edge portion 53a of the leg.

なお、図17、図18では、脚底面端縁部53aがなす円弧の中心から延びる補助線(鎖線)で、脚底面端縁部53aと傾斜面部53bとの交点を示しており、脚底面端縁部53aがなす円弧を傾斜面部53b側に延長した仮想線と、傾斜面部53bがなす円弧を脚底面端縁部53a側に延長した仮想線とをそれぞれ鎖線で示している。 In addition, in FIGS. 17 and 18, auxiliary lines (chain lines) extending from the center of the arc formed by the sole edge portion 53a indicate the intersection of the sole edge portion 53a and the inclined surface portion 53b, and the sole edge portion. A virtual line in which the arc formed by the edge portion 53a is extended toward the inclined surface portion 53b and a virtual line in which the arc formed by the inclined surface portion 53b is extended toward the end edge portion 53a of the leg bottom surface are indicated by chain lines.

このような態様とする場合、連接部54から中心軸Cに下した垂線の長さRと、脚底面端縁部53aと傾斜面部53bとの交点から中心軸Cに下した垂線の長さRとの差が、0.5〜3mmの範囲で、連接部54の長手方向に沿って概ね一定となるようにするのがより好ましい。 When such embodiment, the length of the length R 1 of the perpendicular line beat the central axis C from the connection portion 54, perpendicular line beat from the intersection of the leg bottom edge portion 53a and the inclined surface portion 53b to the center axis C It is more preferable that the difference from R 2 is substantially constant along the longitudinal direction of the connecting portion 54 in the range of 0.5 to 3 mm.

以上、本発明について、好ましい実施形態を示して説明したが、本発明は、前述した実施形態にのみ限定されるものではなく、本発明の範囲で種々の変更実施が可能であることはいうまでもない。 Although the present invention has been described above with reference to preferred embodiments, it goes without saying that the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the present invention. Nor.

例えば、前述した実施形態では、五つの脚部51を底部5に配設した例を示したが、底部5に配設される脚部51の数は、これに限定されない。
また、前述した実施形態では、口部2の下端から胴部4に向かって円錐台状に拡径する肩部3を備える例を示したが、これに限定されない。口部2と胴部4との間をつなぐ肩部3は、例えば、いわゆるつる首状に形成することもできる。同様に、胴部4の形態も図示する例には限定されない。
For example, in the above-described embodiment, an example in which the five legs 51 are arranged on the bottom 5 is shown, but the number of legs 51 arranged on the bottom 5 is not limited to this.
Further, in the above-described embodiment, an example is shown in which the shoulder portion 3 having a truncated cone-like diameter increasing from the lower end of the mouth portion 2 toward the body portion 4 is provided, but the present invention is not limited to this. The shoulder portion 3 connecting the mouth portion 2 and the body portion 4 can be formed, for example, in a so-called vine neck shape. Similarly, the form of the body portion 4 is not limited to the illustrated example.

要するに、本発明に係る合成樹脂製容器は、底部5に配設された脚部51が、底部5の上端から垂下して、下端側が容器内方に湾曲しながら終端するとともに、周方向に沿った長さが下端側で狭められた外周面部52と、底部5の最下端で外周面部52と連接し、外周面部52との連接部54から底部5の中心に向かって上向きに傾斜する脚底面部53とを有し、底部5の中心から連接部54の長手方向中央までの距離に対して、底部5の中心から連接部54の一端までの距離が長くなるように形成されていれば、これ以外の細部の構成は、前述した実施形態に限定されることなく適宜変更することができる。
また、前述した実施形態で説明した細部の構成を適宜取捨選択して組み合わせることもできる。
In short, in the synthetic resin container according to the present invention, the leg portion 51 arranged on the bottom portion 5 hangs down from the upper end of the bottom portion 5, and the lower end side is terminated while being curved inward in the container, and along the circumferential direction. The outer peripheral surface portion 52 whose length is narrowed on the lower end side and the outer peripheral surface portion 52 at the lowermost end of the bottom portion 5 are connected to each other, and the bottom surface portion of the leg is inclined upward from the connecting portion 54 with the outer peripheral surface portion 52 toward the center of the bottom portion 5. If it is formed so that the distance from the center of the bottom portion 5 to one end of the connecting portion 54 is longer than the distance from the center of the bottom portion 5 to the center in the longitudinal direction of the connecting portion 54. The configuration of details other than the above can be appropriately changed without being limited to the above-described embodiment.
In addition, the detailed configurations described in the above-described embodiments can be appropriately selected and combined.

1 容器
5 底部
51 脚部
52 外周面部
52a 外周面端縁部
53 脚底面部
53a 脚底面端縁部
53b 傾斜面部
54 連接部
55 側面部
55a 側面端縁部
1 Container 5 Bottom 51 Leg 52 Peripheral surface 52a Peripheral surface end edge 53 Leg bottom edge 53a Leg bottom edge edge 53b Inclined surface 54 Connecting part 55 Side part 55a Side edge edge

Claims (7)

複数の脚部が中心軸周りに回転対称に、かつ、均等な間隔で放射状に配設された底部を備え、
前記脚部は、
前記底部の上端から垂下して、下端側が容器内方に湾曲しながら終端するとともに、周方向に沿った長さが下端側で狭められた外周面部と、
前記底部の最下端で前記外周面部と連接し、前記外周面部との連接部から前記底部の中心に向かって上向きに傾斜する脚底面部とを有し、
前記底部の中心から前記連接部の長手方向中央までの距離に対して、前記底部の中心から前記連接部の一端までの距離が長いことを特徴とする合成樹脂製容器。
Multiple legs are rotationally symmetrical around the central axis and have bottoms that are evenly spaced radially.
The legs
An outer peripheral surface portion that hangs down from the upper end of the bottom portion, ends while the lower end side curves inward in the container, and the length along the circumferential direction is narrowed on the lower end side.
It has a leg bottom surface portion that is connected to the outer peripheral surface portion at the lowermost end of the bottom portion and is inclined upward from the connecting portion with the outer peripheral surface portion toward the center of the bottom portion.
A synthetic resin container characterized in that the distance from the center of the bottom to one end of the connecting portion is longer than the distance from the center of the bottom to the center in the longitudinal direction of the connecting portion.
前記外周面部の下端側の外周面端縁部は、縦断面が、前記連接部における接線が中心軸と垂直に交わる容器外方に凸の円弧状に形成され、
前記連接部に連なる前記脚底面部の脚底面端縁部は、縦断面が、前記連接部における接線が中心軸と垂直に交わり、かつ、前記外周面端縁部よりも曲率半径が小さい容器外方に凸の円弧状に形成されている請求項1に記載の合成樹脂製容器。
The outer peripheral surface edge portion on the lower end side of the outer peripheral surface portion is formed in an arc shape whose vertical cross section is convex outward of the container at which the tangent line at the connecting portion intersects the central axis perpendicularly.
The bottom edge of the bottom of the leg connected to the connecting portion has a vertical cross section in which the tangent line at the connecting portion intersects the central axis perpendicularly and the radius of curvature is smaller than that of the edge of the outer peripheral surface. The synthetic resin container according to claim 1, which is formed in a convex arc shape.
前記脚底面部は、前記連接部側の脚底面端縁部に連なる傾斜面部を有し、前記傾斜面部は、縦断面が、少なくとも前記脚底面端縁部に連なる側において、容器内方に凸の円弧状とされ、前記脚底面端縁部との交点で、それぞれに接する接線が一致するように前記脚底面端縁部に連続する請求項1又は2に記載の合成樹脂製容器。 The sole portion has an inclined surface portion connected to the end edge portion of the bottom surface of the leg on the connecting portion side, and the inclined surface portion is convex inward of the container at least on the side where the vertical cross section is connected to the end edge portion of the bottom surface of the leg. The synthetic resin container according to claim 1 or 2, which has an arc shape and is continuous with the bottom edge of the leg so that the tangents in contact with the edge of the bottom of the leg coincide with each other at the intersection with the edge of the bottom of the leg. 前記外周面部の周方向に沿った長さは、前記脚部の上端側において、前記外周面部の周方向両端縁が、前記外周面部の周方向中央に向かって左右対称に弧を描くようにして徐々に狭められながら、少なくとも前記脚部の高さの1/2よりも下端側の部位における周方向に沿った長さが、前記脚部の上端における周方向に沿った長さの15〜50%となるように狭められている請求項1〜3のいずれか一項に記載の合成樹脂製容器。 The length of the outer peripheral surface portion along the circumferential direction is such that on the upper end side of the leg portion, both peripheral edges of the outer peripheral surface portion in the circumferential direction form an arc symmetrically toward the center of the outer peripheral surface portion in the circumferential direction. While being gradually narrowed, the length along the circumferential direction at least at a portion closer to the lower end than 1/2 of the height of the leg is 15 to 50 of the length along the circumferential direction at the upper end of the leg. The synthetic resin container according to any one of claims 1 to 3, which is narrowed to%. 前記外周面部の周方向両端縁に連接する側面部の側面端縁部は、横断面が、前記外周面部よりも曲率半径が小さい容器外方に凸の円弧状に形成されている請求項1〜4のいずれか一項に記載の合成樹脂製容器。 Claims 1 to 1 that the side surface edge portion of the side surface portion connected to both peripheral edges of the outer peripheral surface portion is formed in an arc shape whose cross section is convex outward of the container having a smaller radius of curvature than the outer peripheral surface portion. The synthetic resin container according to any one of 4. 少なくとも前記脚部の高さの1/2よりも下端側の部位において、前記側面端縁部の曲率半径が、同じ横断面における前記外周面部の曲率半径の10〜50%である請求項5に記載の合成樹脂製容器。 According to claim 5, the radius of curvature of the side edge portion is 10 to 50% of the radius of curvature of the outer peripheral surface portion in the same cross section at least at a portion on the lower end side of the height of the leg portion. The synthetic resin container described. 前記脚底面部は、少なくとも前記底部の中心側の部位において、前記底部の中心を通って前記脚底面部を周方向に等分する中心線と中心軸とを含む面に直交し、かつ、中心軸に平行な面で切断した断面が、容器外方に凸の円弧状に形成されている請求項1〜6のいずれか一項に記載の合成樹脂製容器。 The bottom surface of the leg is orthogonal to a plane including a center line and a central axis that equally divides the bottom surface of the leg in the circumferential direction through the center of the bottom at least at a portion on the center side of the bottom, and is on the central axis. The synthetic resin container according to any one of claims 1 to 6, wherein a cross section cut along a parallel surface is formed in an arc shape that is convex outward from the container.
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