JP5376520B2

JP5376520B2 - Bottle type synthetic resin container

Info

Publication number: JP5376520B2
Application number: JP2009208166A
Authority: JP
Inventors: 茂秋本; 佐藤　　進; 知行村上; 和也阿部
Original assignee: Daiwa Can Co Ltd
Current assignee: Daiwa Can Co Ltd
Priority date: 2009-09-09
Filing date: 2009-09-09
Publication date: 2013-12-25
Anticipated expiration: 2029-09-09
Also published as: JP2011057254A

Abstract

<P>PROBLEM TO BE SOLVED: To further increase the decompression-resistant strength of a barrel portion of a bottle-shaped synthetic resin container. <P>SOLUTION: An annular first recessed bead 11 is formed in the vicinity of the vertical center of a container of a barrel 4, an annular upper first projecting bead 12 is formed along the barrel 4 circumferentially upwardly from the upper end of the first recessed bead 11, and an upper first inclined surface 14 expanded upwardly is formed upwardly from the upper end of the upper first projecting bead 12, an annular lower first projecting bead 13 is formed along the barrel 4 circumferentially downwardly from the lower end of the first recessed bead 11, and a lower first inclined surface 15 expanded downwardly is formed downwardly from the lower end of the lower first projecting bead 13. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、口頸部と肩部と胴部と底部が一体的に形成されたボトル型の合成樹脂製容器に関し、特に、耐減圧強度を向上させるための環状の凹ビードが容器の胴部に形成されているボトル型合成樹脂製容器に関する。 The present invention relates to a bottle-shaped synthetic resin container in which a mouth / neck part, a shoulder part, a body part, and a bottom part are integrally formed, and in particular, an annular concave bead for improving pressure-resistant strength is provided in the body part of the container. The present invention relates to a bottle-shaped synthetic resin container formed in the above.

ポリエチレンテレフタレートなどの合成樹脂をブロー成形によりボトル形状に一体成形したボトル型の合成樹脂製容器は、飲料用容器等として従来から広く一般的に使用されているが、そのようなボトル型の合成樹脂製容器については、内容物を充填してキャップで密封した後で、容器内が減圧状態になるものがあるため、そのような減圧に伴う容器の胴部での形状変化を防止するための構造を設けることが既に提案されている。 A bottle-shaped synthetic resin container in which a synthetic resin such as polyethylene terephthalate is integrally formed into a bottle shape by blow molding has been widely used as a beverage container. Some containers are filled with contents and sealed with a cap, and then the inside of the container is in a depressurized state. Therefore, a structure for preventing the shape change in the body of the container due to such depressurization Has already been proposed.

すなわち、そのような構造を備えたボトル型の合成樹脂製容器として、例えば、下記の特許文献１には、減圧吸収性能、耐減圧強度、横荷重に対する剛性を確保すると共に、縦荷重に対する座屈強度を向上させるために、容器の胴部に環状の横溝（凹ビード）を複数形成すると共に、それぞれの横溝の深さを、横溝が形成された部位での胴部の肉厚に応じて変化させる、ということが記載されている。 That is, as a bottle-type synthetic resin container having such a structure, for example, in Patent Document 1 below, while ensuring the reduced pressure absorption performance, the reduced pressure resistance, the rigidity against the lateral load, the buckling against the vertical load In order to improve strength, a plurality of annular lateral grooves (concave beads) are formed in the body of the container, and the depth of each lateral groove changes according to the thickness of the body at the site where the lateral grooves are formed. It is described that.

特開２００７−１６１７号公報JP 2007-1617 A

ところで、ボトル型合成樹脂製容器を使用した飲料容器において、近年、内容物の保存性を高めるために、内容物に酸化防止剤を添加する場合があるが、そのような場合、充填・密封された容器のへッドスペース内の酸素が内容物に取り込まれることで、容器の減圧効果が一層大きくなることから、上記の特許文献１に記載されたような構造、即ち、複数の環状横溝（凹ビード）を容器の胴部に形成するというだけでは、容器内の減圧に抗して容器胴部の形状を保つための強度（耐減圧強度）を確保できないような虞がある。 By the way, in a beverage container using a bottle-type synthetic resin container, in recent years, an antioxidant may be added to the contents in order to improve the storage stability of the contents. Since the oxygen in the head space of the container is taken into the contents, the pressure reduction effect of the container is further increased. Therefore, the structure as described in Patent Document 1 above, that is, a plurality of annular lateral grooves (concave beads) ) Only on the body of the container, there is a possibility that the strength (pressure-resistant strength) for maintaining the shape of the container body against the decompression in the container cannot be secured.

本発明は、上記のような問題の解消を課題とするものであり、具体的には、ボトル型の合成樹脂製容器について、容器胴部での耐減圧強度をより一層向上させることを課題とするものである。 An object of the present invention is to solve the above-described problems. Specifically, for a bottle-shaped synthetic resin container, it is an object to further improve the pressure-resistant strength at the container body. To do.

本発明は、上記のような課題を解決するために、口頸部と肩部と胴部と底部が一体的に形成されていて、耐減圧強度を向上させるための凹ビードが、胴部の周方向に沿った環状に形成されているボトル型の合成樹脂製容器において、
胴部の上下方向中央付近に環状の第１凹ビードが形成されているのに対して、該第１凹ビードの上端から上方に続いて、胴部の周方向に沿った環状の上側第１凸ビードが形成され、該上側第１凸ビードの上端から上方に続いて、上方に向かって拡径する上側第１傾斜面が形成され、また、該第１凹ビードの下端から下方に続いて、胴部の周方向に沿った環状の下側第１凸ビードが形成され、該下側第１凸ビードの下端から下方に続いて、下方に向かって拡径する下側第１傾斜面が形成されていて、
更に、上側第１傾斜面の上方に、胴部の周方向に沿った環状の上側第２凹ビードが形成され、該上側第２凹ビードの上端から上方に続いて、胴部の周方向に沿った環状の上側第２凸ビードが形成され、該上側第２凸ビードの上端から上方に続いて、上方に向かって拡径する上側第２傾斜面が形成され、また、下側第１傾斜面の下方に、胴部の周方向に沿った環状の下側第２凹ビードが形成され、該下側第２凹ビードの下端から下方に続いて、胴部の周方向に沿った環状の下側第２凸ビードが形成され、該下側第２凸ビードの下端から下方に続いて、下方に向かって拡径する下側第２傾斜面が形成されていることで、
凹ビードや凸ビードによる小さな凹凸を無視して容器の胴部を全体的に見た状態で、胴部の上部の下端および下部の上端から中央付近に向かって外径が徐々に小さくなっていて、胴部の外径が最も小さくなった箇所に第１凹ビードが形成されていると共に、
容器軸線方向に対する角度を傾斜角度として、前記上側第１傾斜面及び下側第１傾斜面の傾斜角度よりも前記上側第２傾斜面及び下側第２傾斜面の傾斜角度の方が大きくなるように設定されていることを特徴とするものである。 In order to solve the above-described problems, the present invention is configured such that the mouth and neck, the shoulder, the trunk, and the bottom are integrally formed, and a concave bead for improving the pressure-resistant strength is provided on the trunk. In a bottle-shaped synthetic resin container formed in an annular shape along the circumferential direction,
An annular first concave bead is formed in the vicinity of the center of the body portion in the up-down direction, whereas an upper annular first portion along the circumferential direction of the body portion continues upward from the upper end of the first concave bead. A convex bead is formed, and an upper first inclined surface having a diameter increasing upward is formed continuously from the upper end of the upper first convex bead , and further downward from the lower end of the first concave bead. An annular lower first convex bead is formed along the circumferential direction of the body portion, and a lower first inclined surface that expands downward from the lower end of the lower first convex bead is formed. Formed ,
Furthermore, an annular upper second concave bead is formed above the upper first inclined surface along the circumferential direction of the trunk portion, and continues upward from the upper end of the upper second concave bead in the circumferential direction of the trunk portion. An annular second upper convex bead is formed, and an upper second inclined surface having a diameter increasing upward is formed from the upper end of the upper second convex bead, and the lower first inclined is formed. An annular lower second concave bead along the circumferential direction of the trunk is formed below the surface, and the annular second circumferential concave of the trunk is continued downward from the lower end of the lower second concave bead. The lower second convex bead is formed, and the lower second inclined surface that expands downward from the lower end of the lower second convex bead is formed.
The outer diameter gradually decreases from the lower end of the upper part of the barrel and the upper end of the lower part toward the center while ignoring small irregularities due to the concave beads and convex beads. The first concave bead is formed at the place where the outer diameter of the body portion is the smallest,
The inclination angle of the upper second inclined surface and the lower second inclined surface is larger than the inclination angle of the upper first inclined surface and the lower first inclined surface, where the angle with respect to the container axis direction is an inclination angle. It is characterized by being set to .

上記のような本発明のボトル型合成樹脂製容器によれば、容器胴部の上下方向中央付近に形成された第１凹ビードに対して、その上下両側が上側第１凸ビードと下側第１凸ビードとにより補強されるため、減圧状態となったときに容器胴部の形状を確実に保持することができると共に、上側第１凸ビードの上方の上側第１傾斜面と、下側第１凸ビードの下方の下側第１傾斜面とにより、耐減圧強度を更に向上させることができ、且つ、容器への縦荷重に対する充分な座屈強度も確保することができる。
また、上側第１傾斜面及び下側第１傾斜面の傾斜角度よりも上側第２傾斜面及び下側第２傾斜面の傾斜角度の方が大きくなるように設定していることで、容器の胴部に充分な大きさと深さを備えたくびれ領域を形成することができて、容器の胴部を手で掴む時のグリップ性も向上させることができる。 According to the bottle type synthetic resin container of the present invention as described above, with respect to the first concave bead formed in the vicinity of the center of the container body in the vertical direction, the upper and lower first convex beads and the lower side of the first concave bead are formed. Since it is reinforced by one convex bead, the shape of the container body can be reliably held when the pressure is reduced, and the upper first inclined surface above the upper first convex bead and the lower first With the lower first inclined surface below the one convex bead, the pressure-resistant strength can be further improved, and sufficient buckling strength against a longitudinal load on the container can be secured.
In addition, by setting the inclination angle of the upper second inclined surface and the lower second inclined surface to be larger than the inclination angle of the upper first inclined surface and the lower first inclined surface, A constricted region having a sufficient size and depth can be formed in the body part, and the grip performance when the body part of the container is grasped by hand can be improved.

本発明のボトル型合成樹脂製容器の一実施例について、口頸部と肩部と胴部と底部が一体的に形成された容器本体の全体を示す正面図である。It is a front view which shows the whole container main body by which the neck and neck part, the shoulder part, the trunk | drum, and the bottom part were integrally formed about one Example of the bottle type synthetic resin containers of this invention. 図１に示した容器の中心軸を通る切断面を示す断面説明図である。It is a cross-sectional explanatory view showing a cut surface passing through the central axis of the container shown in FIG. 図２に示した容器の切断面のＡで示した部分を拡大して示す断面説明図である。FIG. 3 is an explanatory cross-sectional view illustrating an enlarged portion indicated by A of the cut surface of the container illustrated in FIG. 2.

ボトル型の合成樹脂製容器について、容器胴部での耐減圧強度をより一層向上させるという目的を、最良の形態として以下の実施例に具体的に示すように、胴部の上下方向中央付近に環状の第１凹ビードが形成されているのに対して、該第１凹ビードの上端から上方に続いて、胴部の周方向に沿った環状の上側第１凸ビードを形成し、該上側第１凸ビードの上端から上方に続いて、上方に向かって拡径する上側第１傾斜面を形成し、また、該第１凹ビードの下端から下方に続いて、胴部の周方向に沿った環状の下側第１凸ビードを形成し、該下側第１凸ビードの下端から下方に続いて、下方に向かって拡径する下側第１傾斜面を形成して、
更に、上側第１傾斜面の上方に、胴部の周方向に沿った環状の上側第２凹ビードを形成し、該上側第２凹ビードの上端から上方に続いて、胴部の周方向に沿った環状の上側第２凸ビードを形成し、該上側第２凸ビードの上端から上方に続いて、上方に向かって拡径する上側第２傾斜面を形成し、また、下側第１傾斜面の下方に、胴部の周方向に沿った環状の下側第２凹ビードを形成し、該下側第２凹ビードの下端から下方に続いて、胴部の周方向に沿った環状の下側第２凸ビードを形成し、該下側第２凸ビードの下端から下方に続いて、下方に向かって拡径する下側第２傾斜面を形成することで、
凹ビードや凸ビードによる小さな凹凸を無視して容器の胴部を全体的に見た状態で、胴部の上部の下端および下部の上端から中央付近に向かって外径を徐々に小さくして、胴部の外径を最も小さくした箇所に第１凹ビードを形成していると共に、
容器軸線方向に対する角度を傾斜角度として、前記上側第１傾斜面及び下側第１傾斜面の傾斜角度よりも前記上側第２傾斜面及び下側第２傾斜面の傾斜角度の方が大きくなるように設定する、ということで実現した。 For the bottle-shaped synthetic resin container, the purpose of further improving the pressure-resistant strength at the container body is shown in the following embodiment as the best mode, in the vicinity of the center of the body in the vertical direction. An annular first concave bead is formed, whereas an upper upper first convex bead is formed along the circumferential direction of the body portion, continuing upward from the upper end of the first concave bead. Following upward from the upper end of the first convex bead, upward to form an upper first inclined surface whose diameter increases and, following the lower end of the first concave bead downwards, along the circumferential direction of the body portion Forming an annular lower first convex bead, and forming a lower first inclined surface that expands downward from the lower end of the lower first convex bead ;
Further, an annular upper second concave bead is formed above the upper first inclined surface along the circumferential direction of the trunk, and the upper end of the upper second concave bead is continued upward from the upper end of the upper second concave bead in the circumferential direction of the trunk. An upper upper second convex bead is formed, and an upper second inclined surface having a diameter increasing upward is formed continuously from the upper end of the upper second convex bead, and the lower first inclined An annular lower second concave bead is formed below the surface along the circumferential direction of the trunk, and an annular shape along the circumferential direction of the trunk is formed downward from the lower end of the lower second concave bead. By forming a lower second convex bead and forming a lower second inclined surface that expands downward from the lower end of the lower second convex bead,
While ignoring small irregularities due to concave beads and convex beads, the outer diameter of the container gradually decreases from the lower end of the upper part of the container and the upper end of the lower part toward the center, While forming the first concave bead at the place where the outer diameter of the body portion is the smallest,
The inclination angle of the upper second inclined surface and the lower second inclined surface is larger than the inclination angle of the upper first inclined surface and the lower first inclined surface, where the angle with respect to the container axis direction is an inclination angle. It was realized by setting to.

以下、本発明のボトル型合成樹脂製容器の一実施例について説明すると、本実施例のボトル型合成樹脂製容器では、キャップを除く容器本体（口頸部と肩部と胴部と底部）がブロー成形等により一体成形されている。なお、容器本体を構成する合成樹脂としては、ポリエチレンテレフタレートやポリブチレンテレフタレート等のポリエステル系樹脂、ポリエチレンやポリプロピレン等のオレフィン系樹脂、ポリカーボネート樹脂、ポリアクリレート樹脂等が好適に使用できる。 Hereinafter, an embodiment of the bottle-type synthetic resin container of the present invention will be described. In the bottle-type synthetic resin container of the present embodiment, the container body (mouth neck portion, shoulder portion, trunk portion, and bottom portion) excluding the cap is provided. It is integrally formed by blow molding or the like. As the synthetic resin constituting the container body, polyester resins such as polyethylene terephthalate and polybutylene terephthalate, olefin resins such as polyethylene and polypropylene, polycarbonate resins and polyacrylate resins can be preferably used.

そのような合成樹脂からなる容器本体では、図１に示すように、キャップ（図示せず）と螺合するネジ部が形成された小径の口頸部２から下方に、下方に向かって拡径する傾斜した肩部３が一体的に形成され、肩部３の下方に、横断面が円形の胴部４が一体的に形成され、胴部４の下方に、底面の中央部が上方に突出した浅いカップ状（皿状）の底部５が一体的に形成されている。 In the container body made of such a synthetic resin, as shown in FIG. 1, the diameter is increased downward from the small-diameter mouth-and-neck portion 2 formed with a screw portion to be screwed with a cap (not shown). An inclined shoulder portion 3 is integrally formed, a trunk portion 4 having a circular cross section is integrally formed below the shoulder portion 3, and a central portion of the bottom surface projects upward below the trunk portion 4. A shallow cup-shaped (dish-shaped) bottom 5 is integrally formed.

そして、口頸部２には、上部外周面に形成されたネジ部２ａの下方に、キャップのピルファープルーフバンドを係止させるための顎部２ｂが形成され、顎部２ｂの下方に、容器半径方向外方に突出したサポートリング２ｃが形成されている。また、肩部３は、口頸部２の下端に接続されて縦断面形状が容器内方に凸となる円弧状の凹状曲面部３ａと、該凹状曲面部３ａの下端に接続されて縦断面形状が容器外方に凸となる円弧状の凸状曲面部３ｂとで構成されている。 The mouth and neck portion 2 is formed with a jaw portion 2b for locking the pill fur proof band of the cap below the screw portion 2a formed on the upper outer peripheral surface, and below the jaw portion 2b, a container A support ring 2c protruding outward in the radial direction is formed. Further, the shoulder 3 is connected to the lower end of the mouth-and-neck portion 2 and is connected to the arcuate concave curved surface portion 3a whose longitudinal section is convex inward of the container, and to the lower end of the concave curved surface portion 3a. The shape is composed of an arc-shaped convex curved surface portion 3b that is convex outward of the container.

胴部４には、肩部３の凸状曲面部３ｂの下端に続く円筒状の上部ストレート部４ａと、カップ状（皿状）の底部５の上端に続く円筒状の下部ストレート部４ｂとが形成されており、凹ビードや凸ビードによる小さな小さな凹凸を無視して全体的に見た状態では、胴部４は、上部ストレート部４ａ及び下部ストレート部４ｂから上下方向中央付近に向かって外径が徐々に小さくなって、胴部４の上下方向中央付近で外径が最も小さくなるように、真ん中がくびれた形状となっている。 The body portion 4 includes a cylindrical upper straight portion 4a continuing from the lower end of the convex curved surface portion 3b of the shoulder portion 3, and a cylindrical lower straight portion 4b continuing from the upper end of the cup-shaped (dish-shaped) bottom portion 5. In the state of being formed and viewed as a whole, ignoring small small irregularities due to concave beads or convex beads, the body portion 4 has an outer diameter from the upper straight portion 4a and the lower straight portion 4b toward the center in the vertical direction. Is gradually narrowed so that the middle diameter is constricted so that the outer diameter becomes the smallest near the center in the vertical direction of the body part 4.

ところで、上記のような本実施例のボトル型合成樹脂製容器において、胴部４の上下方向中央付近で、胴部４の外径が最も小さくなった箇所には、胴部４の周方向に沿った環状の第１凹ビード（凹溝）１１が形成されている。 By the way, in the bottle-type synthetic resin container of the present embodiment as described above, in the vicinity of the center of the body portion 4 in the vertical direction, the portion where the outer diameter of the body portion 4 becomes the smallest is in the circumferential direction of the body portion 4. An annular first concave bead (concave groove) 11 is formed.

そして、第１凹ビード１１の上側には、第１凹ビード１１の上端から上方に続いて、胴部４の周方向に沿った環状の上側第１凸ビード（凸条）１２が形成され、この上側第１凸ビード１２の上端から上方に続いて、上方に向かって拡径するテーパー面状の上側第１傾斜面１４が形成されていると共に、第１凹ビード１１の下側には、第１凹ビード１１の下端から下方に続いて、胴部４の周方向に沿った環状の下側第１凸ビード１３が形成され、この下側第１凸ビード１３の下端から下方に続いて、下方に向かって拡径するテーパー面状の下側第１傾斜面１５が形成されている。 And, on the upper side of the first concave bead 11, an annular upper first convex bead (projection) 12 is formed along the circumferential direction of the body part 4, following the upper end of the first concave bead 11. A taper-shaped upper first inclined surface 14 having a diameter increasing upward is formed continuously from the upper end of the upper first convex bead 12, and below the first concave bead 11, From the lower end of the first concave bead 11, an annular lower first convex bead 13 is formed along the circumferential direction of the body 4, and the lower first convex bead 13 continues downward from the lower end. A lower first inclined surface 15 having a tapered surface shape whose diameter is expanded downward is formed.

また、本実施例では、図３に示すように、上側第１傾斜面１４の上方に、胴部４の周方向に沿った環状の上側第２凹ビード１６が形成されていて、この上側第２凹ビード１６の上端から上方に続いて、胴部４の周方向に沿った環状の上側第２凸ビード１８が形成され、上側第２凸ビード１８の上端から上方に続いて、上方に向かって拡径するテーパー面状の上側第２傾斜面２０が形成されていると共に、下側第１傾斜面１５の下方に、胴部４の周方向に沿った環状の下側第２凹ビード１７が形成されていて、下側第２凹ビード１７の下端から下方に続いて、胴部４の周方向に沿った環状の下側第２凸ビード１９が形成され、下側第２凸ビード１９の下端から下方に続いて、下方に向かって拡径するテーパー面状の下側第２傾斜面２１が形成されている。 Further, in the present embodiment, as shown in FIG. 3, an annular upper second concave bead 16 is formed above the upper first inclined surface 14 along the circumferential direction of the trunk portion 4. An annular second upper convex bead 18 is formed along the circumferential direction of the body part 4 from the upper end of the two-concave bead 16, and the upper second convex bead 18 continues upward from the upper end of the upper second convex bead 18. The upper second inclined surface 20 having a tapered surface shape that expands in diameter is formed, and an annular lower second concave bead 17 is formed below the lower first inclined surface 15 along the circumferential direction of the body 4. The lower second convex bead 19 is formed in an annular lower second convex bead 19 along the circumferential direction of the body portion 4, downward from the lower end of the lower second concave bead 17. The lower second inclined surface 21 having a tapered surface shape that expands downward from the lower end of the taper is formed. To have.

さらに、本実施例では、容器の胴部４の上部と下部がそれぞれ円筒状のストレート部４ａ、４ｂに形成されているのに対して、上部ストレート部４ａの上下方向中央付近に、胴部４の周方向に沿った環状の上側第３凹ビード２２が形成されていると共に、下部ストレート４ｂの上下方向中央付近に、胴部４の周方向に沿った環状の下側第３凹ビード２３が形成されている。 Furthermore, in the present embodiment, the upper and lower portions of the barrel portion 4 of the container are formed as cylindrical straight portions 4a and 4b, respectively, whereas the barrel portion 4 is located near the vertical center of the upper straight portion 4a. An annular upper third concave bead 22 is formed along the circumferential direction of the lower straight 4b, and an annular lower third concave bead 23 along the circumferential direction of the body part 4 is formed near the center of the lower straight 4b. Is formed.

なお、上記のような本実施例の胴部の構造について更に具体的に詳しく説明すると、本実施例では、内容量が３００〜５００ｍｌの小型のボトル型合成樹脂容器における耐減圧強度やグリップ性等を向上させるという観点から、胴部４の最大外径（上部ストレート部４ａや下部ストレート部４ｂの外径）と第１凹ビード１１の最小外径との差（容器半径方向での長さ）については、４〜８ｍｍの範囲に設定されており、上側第１凸ビード１２（及び下側第１凸ビード１３）の最大外径については、胴部４の最大外径よりも小さくなっていて、胴部４の最大外径と上側第１凸ビード１２（及び下側第１凸ビード１３）の最大外径との差については、１〜７ｍｍの範囲に設定されている。 The structure of the body portion of the present embodiment as described above will be described in more detail. In this embodiment, the pressure-resistant strength, grip properties, etc. in a small bottle-type synthetic resin container having an internal volume of 300 to 500 ml are described. From the viewpoint of improving the difference between the maximum outer diameter of the body portion 4 (the outer diameter of the upper straight portion 4a and the lower straight portion 4b) and the minimum outer diameter of the first concave bead 11 (length in the container radial direction). Is set in a range of 4 to 8 mm, and the maximum outer diameter of the upper first convex bead 12 (and the lower first convex bead 13) is smaller than the maximum outer diameter of the body portion 4. The difference between the maximum outer diameter of the body 4 and the maximum outer diameter of the upper first convex bead 12 (and the lower first convex bead 13) is set in a range of 1 to 7 mm.

また、第１凹ビード１１の最小外径と上側第１凸ビード１２（及び下側第１凸ビード１３）の最大外径との差については、１〜３ｍｍの範囲に設定されており、上側第１凸ビード１２の最大外径と上側第１傾斜面１４の下端部の外径（及び下側第１凸ビード１３の最大外径と下側第１傾斜面１５の上端部の外径）との差については、０．５〜２ｍｍの範囲に設定されている。 The difference between the minimum outer diameter of the first concave bead 11 and the maximum outer diameter of the upper first convex bead 12 (and the lower first convex bead 13) is set in a range of 1 to 3 mm. The maximum outer diameter of the first convex bead 12 and the outer diameter of the lower end portion of the upper first inclined surface 14 (and the outer diameter of the upper end portion of the lower first convex bead 13 and the upper end portion of the lower first inclined surface 15). Is set in a range of 0.5 to 2 mm.

また、第１凹ビード１１、上側第２凹ビード１６、下側第２凹ビード１７、上側第３凹ビード２２、下側第３凹ビード２３等の凹ビード（凹溝）における溝の底面の幅（容器軸線方向での長さ）については、何れも１〜３ｍｍの範囲に設定されている。 Further, the bottom surface of the groove in the concave bead (concave groove) such as the first concave bead 11, the upper second concave bead 16, the lower second concave bead 17, the upper third concave bead 22, the lower third concave bead 23, etc. The width (length in the container axis direction) is set in a range of 1 to 3 mm.

また、上側第１傾斜面１４（及び下側第１傾斜面１５）の傾斜角度（容器軸線方向に対する角度）については、３〜８゜の範囲に設定されており、上側第２傾斜面２０（及び下側第２傾斜面２１）の傾斜角度については、５〜１５゜の範囲に設定されていて、上側第１傾斜面１４（及び下側第１傾斜面１５）よりも上側第２傾斜面２０（及び下側第２傾斜面２１）の傾斜角度の方が大きくなるように設定されている。 In addition, the inclination angle of the upper first inclined surface 14 (and the lower first inclined surface 15) (angle with respect to the container axis direction) is set in a range of 3 to 8 °, and the upper second inclined surface 20 ( Further, the inclination angle of the lower second inclined surface 21) is set in the range of 5 to 15 °, and the upper second inclined surface is higher than the upper first inclined surface 14 (and the lower first inclined surface 15). The inclination angle of 20 (and the lower second inclined surface 21) is set to be larger.

上記のような本実施例のボトル型合成樹脂製容器によれば、容器の胴部４の上下方向中央付近に形成された第１凹ビード１１に対して、その上下両側が上側第１凸ビード１２と下側第１凸ビード１３とにより補強されるため、減圧状態となったときに容器の胴部４の形状を確実に保持することができると共に、上側第１凸ビード１２の上方に形成された上側第１傾斜面１４と、下側第１凸ビード１３の下方に形成された下側第１傾斜面１５とにより、耐減圧強度を更に向上させることができ、且つ、容器への縦荷重に対する充分な座屈強度も確保することができる。 According to the bottle-type synthetic resin container of the present embodiment as described above, the upper and lower sides of the first concave bead 11 formed near the center of the body portion 4 in the vertical direction are the upper first convex beads. 12 and the lower first convex bead 13, so that the shape of the body 4 of the container can be reliably held when the pressure is reduced, and the upper first convex bead 12 is formed above. Due to the upper first inclined surface 14 and the lower first inclined surface 15 formed below the lower first convex bead 13, the pressure-resistant strength can be further improved, and the vertical to the container can be improved. Sufficient buckling strength against the load can be secured.

なお、上記の点に関して、本実施例では、第１凹ビード１１の最小外径と上側第１凸ビード１２（及び下側第１凸ビード１３）の最大外径との差を１〜３ｍｍの範囲に設定すると共に、上側第１凸ビード１２（及び下側第１凸ビード１３）の最大外径と上側第１傾斜面の下端部（及び下側第１傾斜面の上端部）の外径との差を０．５〜２ｍｍの範囲に設定していることから、凹ビードと凸ビードとによる充分な補強効果が得られて、耐減圧強度を向上させることができると共に、隣接する凹ビードと凸ビードとの凹凸差を大きくし過ぎないため、成形性が損なわれることなく、また、容器への縦荷重に対する充分な座屈強度も確保することができる。 In this embodiment, the difference between the minimum outer diameter of the first concave bead 11 and the maximum outer diameter of the upper first convex bead 12 (and the lower first convex bead 13) is 1 to 3 mm. The maximum outer diameter of the upper first convex bead 12 (and the lower first convex bead 13) and the outer diameter of the lower end portion of the upper first inclined surface (and the upper end portion of the lower first inclined surface) are set. Is set in a range of 0.5 to 2 mm, so that a sufficient reinforcing effect can be obtained by the concave bead and the convex bead, the pressure-resistant strength can be improved, and the adjacent concave bead Since the unevenness difference between the convex bead and the convex bead is not increased too much, the moldability is not impaired, and sufficient buckling strength against the longitudinal load on the container can be ensured.

さらに、本実施例では、上側第１傾斜面１４よりも上方に、上側第２凹ビード１６と上側第２凸ビード１８と上側第２傾斜面２０を形成すると共に、下側第１傾斜面１５よりも下方に、下側第２凹ビード１７と下側第２凸ビード１９と下側第２傾斜面２１を形成していることから、上側第１傾斜面１４よりも上方の部分や下側第１傾斜面１５よりも下方の部分においても、容器の胴部４の剛性が一層増大することとなって、容器の胴部４の耐減圧強度を更に向上させることができる。 Furthermore, in the present embodiment, the upper second concave bead 16, the upper second convex bead 18, and the upper second inclined surface 20 are formed above the upper first inclined surface 14, and the lower first inclined surface 15 is formed. The lower second concave bead 17, the lower second convex bead 19, and the lower second inclined surface 21 are formed below the upper first inclined surface 14 and the lower side. Even in the portion below the first inclined surface 15, the rigidity of the container body 4 is further increased, and the pressure-resistant strength of the container body 4 can be further improved.

また、本実施例では、凹ビードや凸ビードによる小さな凹凸を無視して容器の胴部４を全体的に見た状態で、胴部４の上部（上部ストレート部４ａ）下端および下部（下部ストレート部４ｂ）上端から中央付近に向かって外径を徐々に小さくして、胴部４の外径が最も小さくなった箇所に第１凹ビード１１を形成していることから、胴部４の中央付近で耐減圧強度を効果的に向上させることができると共に、胴部４の中央付近がくびれていることで、容器の胴部を手で掴む時のグリップ性を向上させることができる。 Further, in this embodiment, the upper portion (upper straight portion 4a) of the barrel portion 4 (lower straight) and the lower portion (lower straight portion) of the barrel portion 4 are viewed in a state where the concave portion and the small irregularities due to the convex beads are ignored. Part 4b) Since the outer diameter is gradually decreased from the upper end toward the center, and the first concave bead 11 is formed at the position where the outer diameter of the body part 4 is the smallest, the center of the body part 4 The pressure-resistant strength can be effectively improved in the vicinity, and the vicinity of the center of the body part 4 is narrowed, whereby the grip performance when the body part of the container is grasped by hand can be improved.

なお、上記の点に関して、本実施例では、胴部４の上部（上部ストレート部４ａ）と下部（下部ストレート部４ｂ）の間に、上側第１傾斜面１４（及び下側第１傾斜面１５）と上側第２傾斜面２０（及び下側第２傾斜面２１）とを形成すると共に、上側第１傾斜面１４（及び下側第１傾斜面１５）よりも上側第２傾斜面２０（及び下側第２傾斜面２１）の傾斜角度の方が大きくなるように設定していることから、容器の胴部４に充分な大きさと深さを備えたくびれ領域を形成することができて、耐減圧強度を充分に向上させることができると共に、容器の胴部４を手で掴む時のグリップ性も向上させることができる。 In addition, regarding this point, in the present embodiment, the upper first inclined surface 14 (and the lower first inclined surface 15) are disposed between the upper portion (upper straight portion 4 a) and the lower portion (lower straight portion 4 b) of the trunk portion 4. ) And the upper second inclined surface 20 (and the lower second inclined surface 21), and the upper second inclined surface 20 (and the upper first inclined surface 14 (and the lower first inclined surface 15)). Since the inclination angle of the lower second inclined surface 21) is set to be larger, a constricted region having a sufficient size and depth can be formed in the body portion 4 of the container, The pressure-resistant strength can be sufficiently improved, and the grip performance when the body portion 4 of the container is grasped by hand can be improved.

また、本実施例では、容器の胴部４の上部と下部をそれぞれ円筒状のストレート部４ａ、４ｂに形成しており、それらの部分では胴部４の側壁が容器軸線方向と平行であるため、自動販売機にて容器を販売するような際に、容器を横置きして安定的に積み重ねたり、容器を横にした状態で排出シュートに詰まらせることなく確実に排出したりすることができると共に、ストレート部（上部ストレート部４ａや下部ストレート部４ｂ）では、その上下方向中央付近に凹ビード（上側第３凹ビード２２と下側第３凹ビード２３）を形成していることから、ストレート部の強度が増大することとなって、自動販売機等での容器の積み重ね性や排出性をより向上させることができる。 Further, in this embodiment, the upper and lower portions of the barrel portion 4 of the container are formed as cylindrical straight portions 4a and 4b, respectively, and the side walls of the barrel portion 4 are parallel to the container axial direction at those portions. When selling containers with vending machines, containers can be placed horizontally and stacked stably, or can be discharged reliably without clogging the discharge chute with the containers lying horizontally. At the same time, in the straight portion (upper straight portion 4a and lower straight portion 4b), a concave bead (upper third concave bead 22 and lower third concave bead 23) is formed near the center in the vertical direction. As the strength of the part increases, it is possible to further improve the stackability and dischargeability of containers in a vending machine or the like.

なお、上記の点に関して、本実施例では、上側第１凸ビード１２（及び下側第１凸ビード１３）の最大外径が、胴部４の最大外径（上部ストレート部４ａや下部ストレート部４ｂの外径）よりも小さくなっていて、上側第１凸ビード１２（及び下側第１凸ビード１３）は、胴部４の最大外径部（上部ストレート部４ａや下部ストレート部４ｂ）よりも容器半径方向内方に位置していることから、自動販売機での横置き時の安定性が良いものになっていると共に、上側第１凸ビード１２（及び下側第１凸ビード１３）が形成されていても、容器の胴部４で中央付近が上部や下部（上部ストレート部４ａや下部ストレート部４ｂ）よりも確実に凹んでいるため、容器の胴部４を手で掴む時のグリップ性が良いものとなっている。 Regarding the above points, in this embodiment, the maximum outer diameter of the upper first convex bead 12 (and the lower first convex bead 13) is the maximum outer diameter of the trunk portion 4 (upper straight portion 4a and lower straight portion). The upper first convex bead 12 (and the lower first convex bead 13) is smaller than the maximum outer diameter part (upper straight part 4a and lower straight part 4b) of the body part 4. Is also located inward in the radial direction of the container, so that it has good stability when placed in a vending machine, and the upper first convex bead 12 (and the lower first convex bead 13). Even when the container body 4 is formed, the vicinity of the center of the container body 4 is more securely recessed than the upper and lower parts (upper straight part 4a and lower straight part 4b). The grip is good.

以上、本発明のボトル型合成樹脂製容器の一実施例について説明したが、本発明は、上記の実施例に示した具体的な構造にのみ限定されるものではなく、例えば、上記の実施例では、対象となる容器が横断面円形の丸型容器であるが、そのようなものに限らず、横断面多角形の角型容器にも適用可能なものであり、また、上記の実施例では、容器の肩部を凹状曲面部３ａと凸状曲面部３ｂとからなる形状としているが、そのような形状に限られるものではなく、また、上記の実施例では、上側第１傾斜面１４、下側第１傾斜面１５、上側第２傾斜面２０、下側第２傾斜面２１等の傾斜面は、何れも、縦断面形状が直線状のテーパー面に形成されているが、そのようなものに限らず、縦断面形状が円弧状の曲面に形成しても良く、その場合には、縦断面形状が円弧状に形成された各傾斜面の上端と下端とを結ぶ仮想線の傾斜角度について、実施例に示したような角度範囲に設定されていることが好ましい等、適宜に設計変更可能なものであることはいうまでもない。 As mentioned above, although one Example of the bottle-type synthetic resin container of this invention was described, this invention is not limited only to the specific structure shown in said Example, For example, said Example In this case, the target container is a round container having a circular cross section, but is not limited to such a container, and can be applied to a rectangular container having a polygonal cross section. The shoulder portion of the container is formed of a concave curved surface portion 3a and a convex curved surface portion 3b. However, the shape is not limited to such a shape. In the above embodiment, the upper first inclined surface 14, The inclined surfaces such as the lower first inclined surface 15, the upper second inclined surface 20, and the lower second inclined surface 21 are all formed in a tapered surface with a longitudinal cross-sectional shape. In addition to the above, the vertical cross-sectional shape may be an arcuate curved surface. Change the design appropriately, for example, the inclination angle of the imaginary line connecting the upper end and the lower end of each inclined surface whose longitudinal section is formed in an arc shape is preferably set in the angle range as shown in the example It goes without saying that it is possible.

１容器本体
２口頸部
３肩部
４胴部
４ａ上部ストレート部（胴部の上部）
４ｂ下部ストレート部（胴部の下部）
５底部
１１第１凹ビード
１２上側第１凸ビード
１３下側第１凸ビード
１４上側第１傾斜面
１５下側第１傾斜面
１６上側第２凹ビード
１７下側第２凹ビード
１８上側第２凸ビード
１９下側第２凸ビード
２０上側第２傾斜面
２１下側第２傾斜面
２２上側第３凹ビード
２３下側第３凹ビード DESCRIPTION OF SYMBOLS 1 Container body 2 Mouth neck part 3 Shoulder part 4 Trunk part 4a Upper straight part (upper part of trunk | drum)
4b Lower straight part (lower part of trunk)
5 bottom 11 first concave bead 12 upper first convex bead 13 lower first convex bead 14 upper first inclined surface 15 lower first inclined surface 16 upper second concave bead 17 lower second concave bead 18 upper second Convex bead 19 Lower second convex bead 20 Upper second inclined surface 21 Lower second inclined surface 22 Upper third concave bead 23 Lower third concave bead

Claims

A bottle-shaped composite in which the mouth and neck, shoulder, body, and bottom are integrally formed, and a concave bead is formed in an annular shape along the circumferential direction of the body to improve the pressure-resistant strength. In resin containers,
An annular first concave bead is formed in the vicinity of the center of the body portion in the up-down direction, whereas an upper annular first portion along the circumferential direction of the body portion continues upward from the upper end of the first concave bead. A convex bead is formed, and an upper first inclined surface having a diameter increasing upward is formed continuously from the upper end of the upper first convex bead , and further downward from the lower end of the first concave bead. An annular lower first convex bead is formed along the circumferential direction of the body portion, and a lower first inclined surface that expands downward from the lower end of the lower first convex bead is formed. Formed ,
Furthermore, an annular upper second concave bead is formed above the upper first inclined surface along the circumferential direction of the trunk portion, and continues upward from the upper end of the upper second concave bead in the circumferential direction of the trunk portion. An annular second upper convex bead is formed, and an upper second inclined surface having a diameter increasing upward is formed from the upper end of the upper second convex bead, and the lower first inclined is formed. An annular lower second concave bead along the circumferential direction of the trunk is formed below the surface, and the annular second circumferential concave of the trunk is continued downward from the lower end of the lower second concave bead. The lower second convex bead is formed, and the lower second inclined surface that expands downward from the lower end of the lower second convex bead is formed.
The outer diameter gradually decreases from the lower end of the upper part of the barrel and the upper end of the lower part toward the center while ignoring small irregularities due to the concave beads and convex beads. The first concave bead is formed at the place where the outer diameter of the body portion is the smallest,
The inclination angle of the upper second inclined surface and the lower second inclined surface is larger than the inclination angle of the upper first inclined surface and the lower first inclined surface, where the angle with respect to the container axis direction is an inclination angle. A bottle-shaped synthetic resin container characterized by being set to .

The upper part and the lower part of the body part of the container are formed in a straight part with side walls parallel to the container axial direction, and an annular upper third recess along the circumferential direction of the body part in the vicinity of the vertical center of the upper straight part. with bead is formed, in the vicinity of the vertical center of the lower straight portion of claim 1, characterized in that the lower third concave bead ring along the circumferential direction of the body portion is formed Bottle type synthetic resin container.