JP7413717B2 - Synthetic resin container - Google Patents

Synthetic resin container Download PDF

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JP7413717B2
JP7413717B2 JP2019192488A JP2019192488A JP7413717B2 JP 7413717 B2 JP7413717 B2 JP 7413717B2 JP 2019192488 A JP2019192488 A JP 2019192488A JP 2019192488 A JP2019192488 A JP 2019192488A JP 7413717 B2 JP7413717 B2 JP 7413717B2
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container
grounding
stepped
inclined surface
synthetic resin
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JP2021066460A (en
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大樹 安川
玲太 石井
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Toyo Seikan Kaisha Ltd
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Description

本発明は、縦圧縮強度を向上させた合成樹脂製容器に関する。 The present invention relates to a synthetic resin container with improved vertical compressive strength.

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有底筒状の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、各種調味料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, synthetic resin containers are made by forming a cylindrical preform with a bottom using a thermoplastic resin such as polyethylene terephthalate, and then molding this preform into a bottle shape by biaxial stretch blow molding or the like. They are used in a wide range of fields as containers for holding various beverages, seasonings, etc.

また、このような合成樹脂製容器を利用した飲料用等のボトルの販売形態も多様化しており、冬場の寒い時期に、店頭のホットウォーマーに陳列されて、内容物を適温に温めて加温販売されることも、一般的な販売形態として見慣れたものになってきている(例えば、特許文献1参照)。 In addition, sales formats for beverage bottles that use such synthetic resin containers are diversifying, and during the cold winter months, they are displayed in hot warmers at stores to warm the contents to an appropriate temperature. Sales have also become a familiar form of general sales (for example, see Patent Document 1).

特開2017-52559号公報JP 2017-52559 Publication

ところで、特許文献1に開示された容器は、中央に位置する陥没部と、この陥没部の周囲に設けられた接地部とを有する底部を備えている。このような底部形状は、加温販売に供される容器に限らず、この種の合成樹脂製容器において、よく知られた形状であり、陥没部の周囲に設けられた接地部が、比較的薄肉に成形される傾向にある。 By the way, the container disclosed in Patent Document 1 includes a bottom portion having a depressed portion located at the center and a grounding portion provided around the depressed portion. This type of bottom shape is a well-known shape not only for containers used for heated sales but also for this type of synthetic resin container, and the grounding part provided around the recessed part is relatively small. They tend to be formed into thin walls.

すなわち、ブロー成形に際しては、一般に、ブロー成形型にセットされたプリフォームが、延伸ロッドにより軸方向に延伸されるとともに、ブローエアーにより軸方向及び周方向に延伸され、延伸された部位にブロー成形型の内面形状が賦形されることによって、所定の容器形状に成形される。このとき、延伸されたプリフォームの底部側は、底部中央に位置する陥没部を賦形する部位に先に接触し、その後、さらに延伸されながら当該部位の周囲に順次接触していくことによって、底部形状が賦形される。このため、陥没部に対して、その周囲に設けられた接地部がより延伸された状態となり、その分薄肉に成形され易い。 In other words, during blow molding, a preform set in a blow mold is generally stretched in the axial direction by a stretching rod, and also in the axial and circumferential directions by blow air, and the stretched part is blow molded. By shaping the inner surface of the mold, it is molded into a predetermined container shape. At this time, the bottom side of the stretched preform first contacts the part that forms the depression located at the center of the bottom, and then sequentially contacts the periphery of the part while being further stretched. The bottom shape is formed. For this reason, the ground contact portion provided around the recessed portion is in a more extended state, and is therefore easier to be formed into a thinner wall.

本発明者らの検討によれば、特許文献1が開示する容器にあっては、ホットウォーマーに陳列できるように全高を低くしながらも、所定の容量が確保できるように胴径を大きくしているが、胴径が大きくなるほど、接地部が薄肉に成形される傾向が強くなるという知見が得られた。そして、例えば、内容物を充填密封して市場に供給するに際し、輸送、保管時に箱積み状態とされたときに加わる積圧によって、軸方向に圧縮されると、接地部を起点とする座屈変形が生じてしまう場合があることが見出された。 According to studies by the present inventors, the container disclosed in Patent Document 1 has a lower overall height so that it can be displayed in a hot warmer, but a larger body diameter to ensure a predetermined capacity. However, we found that the larger the body diameter, the stronger the tendency for the ground contact part to be formed into a thinner wall. For example, when the contents are filled and sealed and supplied to the market, when they are compressed in the axial direction due to the loading pressure applied when they are stacked in boxes during transportation and storage, buckling occurs starting at the ground contact part. It has been found that deformation may occur.

本発明は、上記したような事情に鑑みてなされたものであり、中央に位置する陥没部と、この陥没部の周囲に設けられた接地部とを有する底部を備えた合成樹脂製容器であって、軸方向に圧縮されたときに、接地部を起点とする座屈変形が生じてしまうのを抑制することによって、縦圧縮強度(軸荷重強度)を向上させた合成樹脂製容器の提供を目的とする。 The present invention has been made in view of the above-mentioned circumstances, and provides a synthetic resin container having a bottom portion having a depressed portion located in the center and a grounding portion provided around the depressed portion. Therefore, it is an object of the present invention to provide a synthetic resin container that has improved longitudinal compressive strength (axial load strength) by suppressing buckling deformation originating from the grounding part when compressed in the axial direction. purpose.

本発明に係る合成樹脂製容器は、中央に位置する陥没部と、前記陥没部の周囲に設けられた接地部とを有する底部を備えた合成樹脂製容器であって、前記接地部は、下方に向かって徐々に縮径する容器外方に凸の湾曲面からなるヒール部と、前記陥没部側から径方向外側に向かって下向きに傾斜する傾斜面部との間に、周方向に沿って延在し、前記接地部と交差する複数の凹溝が放射状に形成され、前記傾斜面部と前記陥没部との間に、前記傾斜面部側に位置する第一段差面と、前記第一段差面よりも上方に位置する第二段差面とを含む環状段差部が設けられ、前記凹溝の溝底部が、前記環状段差部の前記第一段差面と面一に連なるように形成された構成としてある。 A synthetic resin container according to the present invention is a synthetic resin container having a bottom portion having a recessed portion located at the center and a grounding portion provided around the recessed portion, wherein the grounding portion is located downwardly. A heel portion that is formed of a curved surface that is convex to the outside of the container and whose diameter gradually decreases toward the outside of the container, and an inclined surface portion that slopes downward from the recessed portion side toward the outside in the radial direction, extending along the circumferential direction. A plurality of grooves are formed in a radial pattern intersecting with the ground contact portion , and between the slope portion and the recessed portion, there is a first step surface located on the slope portion side, and a plurality of grooves extending from the first step surface. an annular stepped portion including a second stepped surface located above the groove, and a groove bottom of the groove is formed to be flush with the first stepped surface of the annular stepped portion. .

本発明によれば、中央に位置する陥没部と、この陥没部の周囲に設けられた接地部とを有する底部を備えた合成樹脂製容器において、軸方向に圧縮されたときに、接地部を起点とする座屈変形が生じてしまうのを抑制することによって、縦圧縮強度を向上させることができる。 According to the present invention, in a synthetic resin container having a bottom portion having a depressed portion located at the center and a grounding portion provided around the depressed portion, when compressed in the axial direction, the grounding portion is By suppressing the occurrence of buckling deformation at the starting point, the longitudinal compressive strength can be improved.

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。1 is a front view schematically showing a synthetic resin container according to an embodiment of the present 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底面図である。FIG. 1 is a bottom view schematically showing a synthetic resin container according to an embodiment of the present 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斜視図である。1 is a perspective view schematically showing a synthetic resin container according to an embodiment of the present invention. 図2のA-A端面図である。FIG. 3 is an end view taken along the line AA in FIG. 2; 図2のB-B端面図である。3 is a BB end view of FIG. 2. FIG. 図4に示された端面と図5に示された端面とを重ねて示す説明図である。FIG. 6 is an explanatory diagram showing the end surface shown in FIG. 4 and the end surface shown in FIG. 5 superimposed. 比較例1の要部拡大端面図である。FIG. 3 is an enlarged end view of main parts of Comparative Example 1. 比較例2の要部拡大端面図である。FIG. 6 is an enlarged end view of a main part of Comparative Example 2.

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であり、図2は、同底面図、図3は、斜め下方から斜視して示す同斜視図である。 FIG. 1 is a front view schematically showing a synthetic resin container according to the present embodiment, FIG. 2 is a bottom view of the container, and FIG. 3 is a perspective view of the container viewed diagonally from below.

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。 The container 1 shown in these figures has a mouth 2, a shoulder 3, a body 4, and a bottom 5, and the body 4 is generally cylindrical and is generally referred to as a round bottle. It has a container shape.

また、これらの図に示す容器1は、容量が約527mL、高さHが約171.5mm、胴径Dが約73mmであり、加温販売に適するように、店頭のホットウォーマーに陳列することを考慮して、全高を低くしながらも、所定の容量が確保できるようにしてある。 Furthermore, the container 1 shown in these figures has a capacity of about 527 mL, a height H of about 171.5 mm, and a body diameter D of about 73 mm, and can be displayed in a hot warmer at a store so that it is suitable for heated sales. Taking this into consideration, the design was designed to ensure a certain capacity while keeping the overall height low.

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。 Such a container 1 is made by molding a bottomed cylindrical preform using thermoplastic resin by injection molding, compression molding, etc., and molding this preform into a predetermined container shape by biaxial stretch blow molding, etc. Manufactured by

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が使用でき、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。これらの樹脂は二種以上混合してもよく、他の樹脂をブレンドしてもよい。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できる。プリフォームは、単層に成形するに限らず、容器1に求められる特性に応じて、ガスバリヤー層などを含む多層に成形することもできる。 As the thermoplastic resin used, any resin that can be blow molded can be used. Specifically, thermoplastic polyesters such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, amorphous polyarylate, polylactic acid, polyethylene furanoate, or copolymers thereof can be used, and in particular, ethylene terephthalate such as polyethylene terephthalate can be used. Thermoplastic polyesters are preferably used. Two or more of these resins may be mixed, or other resins may be blended. Polycarbonate, acrylonitrile resin, polypropylene, propylene-ethylene copolymer, polyethylene, etc. can also be used. The preform is not limited to being formed into a single layer, but can also be formed into a multilayer structure including a gas barrier layer, depending on the characteristics required of the container 1.

口部2は、内容物の注ぎ口となる円筒状の部位である。かかる口部2の開口端側の側面には、図示しない蓋体を取り付けるためのねじ山が設けられている。
肩部3は、口部2の下端に連接し、胴部4に向かって拡径して口部2と胴部4との間をつなぐ部位である。図示する例において、肩部3は、概ね円錐台状に形成されている。
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 spout 2 is a cylindrical portion that serves as a spout for pouring the contents. A screw thread for attaching a lid (not shown) is provided on the side surface of the opening end of the opening 2.
The shoulder portion 3 is a portion that is connected to the lower end of the mouth portion 2, expands in diameter toward the body portion 4, and connects the mouth portion 2 and the body portion 4. In the illustrated example, the shoulder portion 3 is generally shaped like a truncated cone.
The body portion 4 is a portion that occupies most of the height of the container 1, and has an upper end connected to the shoulder portion 3 and a lower end 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というものとする。
Here, the height direction refers to the direction perpendicular to the horizontal plane when the container 1 is erected on the horizontal plane with the mouth 2 facing upward. shall specify the vertical and horizontal directions as well as the vertical and horizontal directions.
Further, although the central axis is indicated by the symbol C in FIG. 1, unless otherwise specified, a cross section cut along a plane including the central axis C is referred to as a longitudinal cross section.

胴部4には、容器内の圧力変化に応じて変形することで、容器内の圧力を調整する六面の圧力調整パネル40が、周方向に沿って所定の間隔で配設されている。圧力調整パネル40の具体的な構成は特に限定されず、容器内の圧力が減少するにつれて容器内方に変形する一方で、容器内の圧力が増加するにつれて容器外方に変形することにより、容器内の圧力変化を吸収し、これによって、容器1の不均一な変形を抑止できるように構成されていればよい。 Six-sided pressure adjustment panels 40 that adjust the pressure inside the container by deforming according to changes in the pressure inside the container are arranged on the body 4 at predetermined intervals along the circumferential direction. The specific configuration of the pressure adjustment panel 40 is not particularly limited, and as the pressure inside the container decreases, it deforms inwardly, and as the pressure inside the container increases, it deforms outwards, thereby deforming the container. Any structure is sufficient as long as it can absorb internal pressure changes and thereby prevent uneven deformation of the container 1.

また、胴部4には、例えば、横方向(高さ方向に直交する方向)からの荷重に対する耐荷重強度を高めるために、その上端側と下端側のそれぞれに、周方向に沿って環状に延在する周溝部41,42を設けるなどしているが、胴部4の具体的構成も図示する例には限定されない。 In addition, in order to increase load-bearing strength against loads from the lateral direction (direction perpendicular to the height direction), the body portion 4 is provided with an annular structure along the circumferential direction on each of its upper and lower end sides. Although extending circumferential grooves 41 and 42 are provided, the specific configuration of the body 4 is not limited to the illustrated example.

本実施形態において、底部5は、中央に位置する陥没部50と、かかる陥没部50の周囲に設けられた接地部51とを有している。 In this embodiment, the bottom portion 5 has a depressed portion 50 located at the center and a grounding portion 51 provided around the depressed portion 50.

陥没部50は、底部5の中央部が、容器内方に概ね円錐台状に窪んだ部位として形成することができる。図示する例において、陥没部50の側面には、陥没部50の剛性を高めるために、容器外方に突出する八つの補強リブ50aが放射状に設けられているが、容器1の自立を損ねてしまうような陥没部50の変形を抑止することができれば、図示する例には限定されない。 The depressed portion 50 can be formed as a region in which the center portion of the bottom portion 5 is depressed inward of the container in a generally truncated conical shape. In the illustrated example, eight reinforcing ribs 50a projecting outward from the container are provided radially on the side surface of the recessed portion 50 in order to increase the rigidity of the recessed portion 50. The present invention is not limited to the illustrated example as long as deformation of the recessed portion 50 such as storage can be suppressed.

陥没部50の周囲に設けられた接地部51は、容器1を水平面に正立させたときに、当該水平面に接触する部位であり、下方に向かって徐々に縮径する容器外方に凸の湾曲面からなるヒール部52と、陥没部50側から径方向外側に向かって下向きに傾斜する傾斜面部53との間に、周方向に沿って延在するように設けられている。 The grounding portion 51 provided around the recessed portion 50 is a portion that comes into contact with the horizontal surface when the container 1 is erected on the horizontal surface, and is a convex portion outward of the container whose diameter gradually decreases downward. It is provided so as to extend along the circumferential direction between a heel portion 52 having a curved surface and an inclined surface portion 53 that slopes downwardly toward the outside in the radial direction from the recessed portion 50 side.

このようにして接地部51を設けるにあたっては、図4に示すように、少なくとも接地部51に連なるヒール部52の下端側の端縁部52aは、縦断面が、中心Oから軸方向に沿って下した垂線VLが接地部51を通る容器外方に凸の円弧状に形成されているのが好ましい。一方、傾斜面部53の接地部51側の端縁部53aは、縦断面が、中心Oから軸方向に沿って下した垂線VLが接地部51を通り、かつ、ヒール部52の下端側の端縁部52aを形成する円弧の曲率半径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。
なお、図4は、図2のA-A端面図であり、端面にあらわれる肉厚を省略して、底部5の要部端面を拡大して示している。
In providing the grounding portion 51 in this manner, as shown in FIG . It is preferable that the perpendicular line VL 1 drawn down is formed in the shape of a circular arc passing through the grounding portion 51 and projecting outward from the container. On the other hand, the end edge portion 53a of the inclined surface portion 53 on the side of the grounding portion 51 has a vertical cross section where a perpendicular line VL2 drawn from the center O2 along the axial direction passes through the grounding portion 51, and the end edge portion 53a is on the lower end side of the heel portion 52. It is preferable that the container be formed into an outwardly convex arc shape with a smaller radius of curvature than the radius of curvature of the arc forming the end edge portion 52a.
Note that FIG. 4 is an end view taken along the line AA in FIG. 2, in which the wall thickness appearing on the end surface is omitted and the end surface of the main part of the bottom portion 5 is shown in an enlarged manner.

接地部51の幅(接地幅)や外径(接地径)は、容器1を安定に自立させることができるように適宜設計することができる。図示する例では、垂線VLと垂線VLとが離れており、垂線VLが傾斜面部53側の接地部51の端縁を通り、垂線VLがヒール部52側の接地部51の端縁を通るように設計されている(図4参照)。換言すれば、端縁部53aを形成する円弧の中心Oから下した垂線VLと端縁部52aを形成する円弧との交点と、端縁部52aを形成する円弧の中心Oから下した垂線VLと端縁部53aを形成する円弧との交点とが、中心軸Cに直交する同一平面上に位置し、これらの交点において、端縁部52a,53aに滑らかに連接するように、接地部51が形成されている。 The width (grounding width) and outer diameter (grounding diameter) of the grounding portion 51 can be appropriately designed so that the container 1 can stably stand on its own. In the illustrated example, the perpendicular line VL 1 and the perpendicular line VL 2 are separated, the perpendicular line VL 1 passing through the edge of the grounding part 51 on the side of the inclined surface part 53, and the perpendicular line VL 2 passing through the edge of the grounding part 51 on the side of the heel part 52. It is designed to pass through the edge (see Figure 4). In other words, the intersection of the perpendicular line VL2 drawn from the center O2 of the arc forming the end edge 53a and the arc forming the end edge 52a, and the point below from the center O1 of the arc forming the end edge 52a. The intersection point between the perpendicular line VL1 and the circular arc forming the edge portion 53a is located on the same plane perpendicular to the central axis C, and the intersection point is such that it smoothly connects to the edge portions 52a and 53a at these intersection points. , a grounding portion 51 is formed.

したがって、垂線VLと垂線VLとの離間距離が、設計上の接地部51の幅となる。垂線VLと垂線VLとは、必要に応じてより離れるように設計してもよいが、垂線VLと垂線VLとの離間距離は、4mm以下であるのが好ましく、より好ましくは3mm以下である。
また、垂線VLと垂線VLとが重なるように設計してもよい。この場合には、ヒール部52と傾斜面部53との境界線上に接地部51が設けられることになる。
Therefore, the distance between the perpendicular line VL 1 and the perpendicular line VL 2 is the designed width of the ground contact portion 51. The perpendicular line VL 1 and the perpendicular line VL 2 may be designed to be further apart if necessary, but the distance between the perpendicular line VL 1 and the perpendicular line VL 2 is preferably 4 mm or less, more preferably 3 mm. It is as follows.
Alternatively, the perpendicular line VL 1 and the perpendicular line VL 2 may be designed to overlap. In this case, the ground contact portion 51 is provided on the boundary line between the heel portion 52 and the inclined surface portion 53.

また、図示する例にあっては、周方向に沿って等間隔に配設された八つの凹溝55が、周方向に沿って延在する接地部51と交差するように、放射状に形成されている。凹溝55は、接地部51及びその周辺を容器内方に部分的に隆起させるようにして形成することができる。凹溝55の溝底部55aは、径方向に長い矩形状に形成することができ、ヒール部52、接地部51、傾斜面部53に連なる側壁部55bが、溝底部55aの幅方向両端縁から幅方向外側に斜めに立ち上がるように形成することができる。
なお、図示する例では、八つの凹溝55を配設しているが、これに限定されない。凹溝55の配設数は、必要に応じて、例えば、4~16とすることができる。凹溝55の溝底部55aの幅は、例えば、1~18mmとすることができる。
Further, in the illustrated example, eight grooves 55 arranged at equal intervals along the circumferential direction are formed radially so as to intersect with the ground contact portion 51 extending along the circumferential direction. ing. The groove 55 can be formed so that the grounding portion 51 and its surroundings are partially raised inward of the container. The groove bottom 55a of the groove 55 can be formed into a rectangular shape that is elongated in the radial direction, and the side wall portion 55b connected to the heel portion 52, the ground contact portion 51, and the inclined surface portion 53 extends from both widthwise edges of the groove bottom 55a. It can be formed to stand up diagonally outward.
In the illustrated example, eight grooves 55 are provided, but the present invention is not limited to this. The number of grooves 55 can be set to, for example, 4 to 16, if necessary. The width of the groove bottom 55a of the groove 55 can be, for example, 1 to 18 mm.

中央に位置する陥没部50と、この陥没部50の周囲に設けられた接地部51とを有する底部5を備える容器1にあっては、軸方向に圧縮されると、接地部51を起点とする座屈変形が生じてしまう場合がある。そのような場合の対策として、本実施形態によれば、周方向に沿って延在するように接地部51を設けるとともに、接地部51と交差する複数の凹溝55を放射状に形成することにより、接地部51に応力が加わると、凹溝55において復元可能な適度な撓み変形が生じ、これによって応力を吸収できるようにしている。その結果、接地部51を起点とする座屈変形を抑止することができ、容器1の縦圧縮強度が向上する。 In a container 1 having a bottom portion 5 having a depressed portion 50 located at the center and a grounding portion 51 provided around the depressed portion 50, when compressed in the axial direction, the bottom portion 5 is compressed from the grounding portion 51 as a starting point. Buckling deformation may occur. As a countermeasure against such a case, according to the present embodiment, the grounding part 51 is provided to extend along the circumferential direction, and a plurality of grooves 55 are formed radially to intersect with the grounding part 51. When stress is applied to the ground contact portion 51, a moderate amount of deflection deformation occurs in the groove 55, which can be restored, thereby absorbing the stress. As a result, buckling deformation starting from the ground contact portion 51 can be suppressed, and the longitudinal compressive strength of the container 1 is improved.

また、加温販売に供される際には、加温によって内容物やヘッドスペースの空気が膨張して容器内の圧力が増加する。これによって、接地部51が容器外方に不均一に膨出するように変形してしまうと、容器1の自立安定性を損ねてしまうが、本実施形態によれば、そのような不具合も有効に回避することができる。 Furthermore, when the container is sold heated, the contents and the air in the head space expand due to heating, increasing the pressure inside the container. As a result, if the grounding portion 51 is deformed so as to bulge unevenly outward from the container, the self-sustaining stability of the container 1 will be impaired, but according to the present embodiment, such a problem can be effectively overcome. can be avoided.

これらの効果をより有効に発揮させる上で、傾斜面部53と陥没部50との間には、傾斜面部53側に位置する第一段差面54aと、第一段差面54aよりも上方に位置する第二段差面54bとを含む環状段差部54を設けることができる。第一段差面54aと第二段差面54bとは、それぞれ中心軸Cに直交する平面上にあるのが好ましく、応力集中を避けるために、縦断面が容器外方に凸の円弧状の連接部54cを介して、第一段差面54aと第二段差面54bとが連接しているのが好ましい。 In order to more effectively exhibit these effects, there is a first stepped surface 54a located on the inclined surface section 53 side and a first stepped surface 54a located above the first stepped surface 54a between the inclined surface section 53 and the depressed section 50. An annular step portion 54 including a second step surface 54b can be provided. It is preferable that the first step surface 54a and the second step surface 54b are on a plane perpendicular to the central axis C, and in order to avoid stress concentration, the longitudinal section is a circular arc-shaped connecting portion that is convex toward the outside of the container. It is preferable that the first step surface 54a and the second step surface 54b are connected to each other via 54c.

傾斜面部53の接地部51側の端縁部53aは、縦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のは前述した通りであるが、それ以外の部分53bは、縦断面が容器内方に凸の円弧状に形成されているのが好ましい。そして、縦断面において、傾斜面部53と第一段差面54aとの交点における当該円弧の接線が、第一段差面54a上にあるように、傾斜面部53と第一段差面54aとが滑らかに連続するように形成されているのが好ましい。同様に、傾斜面部53の接地部51側の端縁部53aと、それ以外の部分53bとは、縦断面における両者の交点において、それぞれに接する接線が一致するように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、端縁部53aがなす円弧を径方向内側に延長した仮想線と、それ以外の部分53bがなす円弧を径方向外側に延長した仮想線とを、それぞれ図4に鎖線で示す。
As described above, it is preferable that the end edge 53a of the inclined surface part 53 on the side of the grounding part 51 has a vertical cross section formed in an arc shape convex to the outside of the container, but the other part 53b is It is preferable that the vertical cross section is formed in the shape of a circular arc convex inward of the container. In the longitudinal section, the inclined surface portion 53 and the first stepped surface 54a are smoothly continuous so that the tangent to the arc at the intersection of the inclined surface portion 53 and the first stepped surface 54a is on the first stepped surface 54a. Preferably, it is formed so as to. Similarly, the edge portion 53a of the inclined surface portion 53 on the side of the grounding portion 51 and the other portion 53b are formed so as to be smoothly continuous so that tangent lines touching each coincide with each other at the intersection point of the two in the longitudinal section. It is preferable that the
Note that an imaginary line extending the arc formed by the edge portion 53a inward in the radial direction and an imaginary line extending the arc formed by the other portion 53b radially outward are shown as dashed lines in FIG. 4, respectively.

このようにして、傾斜面部53と陥没部50との間に、環状段差部54を設けた場合には、図5及び図6に示すように、凹溝55の溝底部55aは、環状段差部54の第一段差面54aと面一に連なるように形成することができる。
なお、図5は、図2のB-B端面図であり、図4と同様に、端面にあらわれる肉厚を省略して、底部5の要部端面を拡大して示している。図6は、図4に示された端面と図5に示された端面とを重ねて示す説明図である。
In this way, when the annular step portion 54 is provided between the inclined surface portion 53 and the depressed portion 50, the groove bottom portion 55a of the concave groove 55 is formed in the annular step portion, as shown in FIGS. It can be formed so as to be flush with the first step surface 54a of 54.
Note that FIG. 5 is a BB end view of FIG. 2, and similarly to FIG. 4, the wall thickness appearing on the end surface is omitted and the end surface of the main part of the bottom portion 5 is shown in an enlarged manner. FIG. 6 is an explanatory diagram showing the end surface shown in FIG. 4 and the end surface shown in FIG. 5 superimposed.

以下、具体的な実施例を挙げて、本発明をより詳細に説明する。 Hereinafter, the present invention will be explained in more detail by giving specific examples.

ポリエチレンテレフタレート系樹脂を用い、重量約24gのプリフォームを射出成形した。成形したプリフォームを加熱して軟化させた後、ブロー成形型にセットして、二軸延伸ブロー成形により図1~図6に示す容器形状となるように、容器1を作成した。
容器1の容量は、約527mL、高さHは、約171.5mm、胴径Dは、約73mmであり、プリフォームの重量から算出した容器1の平均肉厚は、約0.3mmであった。 また、プリフォームの重量から算出した容器1の平均肉厚は、約0.23mmであった。
A preform weighing approximately 24 g was injection molded using polyethylene terephthalate resin. After the molded preform was heated to soften it, it was set in a blow mold and biaxially stretched blow molded to create a container 1 having the shape of the container shown in FIGS. 1 to 6.
The capacity of the container 1 is approximately 527 mL, the height H is approximately 171.5 mm, the body diameter D is approximately 73 mm, and the average wall thickness of the container 1 calculated from the weight of the preform is approximately 0.3 mm. Ta. Further, the average wall thickness of the container 1 calculated from the weight of the preform was about 0.23 mm.

得られた容器1に、約85℃の水を内容物として、これを約515mL充填し、口部2に図示しない蓋体を取り付けて密封した。ヘッドスペースの容積は、約12mLであった。
このようにして内容物が充填密封された容器1に対して、上方から軸方向下方に向けて押圧子を押しつけて、圧縮速度50mm/minで圧縮したところ、約270Nを超えたあたりから、接地部51に変形が認められたが、変形を確認した後、荷重を解除すると元の形状に復元した。
また、座屈が生じるまで容器1を圧縮したところ、口部2と肩部3との連接部付近が陥没するように座屈した。そのときの荷重は、約484Nであった。
The obtained container 1 was filled with about 515 mL of water at about 85° C., and a lid (not shown) was attached to the mouth 2 and sealed. The headspace volume was approximately 12 mL.
When the container 1, which has been filled and sealed with the contents in this manner, is compressed by pressing the presser from above downward in the axial direction at a compression speed of 50 mm/min, the pressure exceeds about 270 N, and then it touches the ground. Deformation was observed in portion 51, but after confirming the deformation, the load was released and it returned to its original shape.
Further, when the container 1 was compressed until buckling occurred, the vicinity of the connecting portion between the mouth portion 2 and the shoulder portion 3 buckled so as to cave in. The load at that time was approximately 484N.

[比較例1]
図7に示すように、接地幅wが約4mm、接地径dが約56mmとなるように全周にわたって平坦に接地部51Cを設けた以外は、実施例1と同様の容器を作成し、実施例1と同様に圧縮強度試験を実施した。
なお、図7は、実施例1の図4に示した端面に相当する部位を示す、比較例2の要部拡大端面図である。
[Comparative example 1]
As shown in FIG. 7, a container similar to that in Example 1 was created, except that the grounding portion 51C was provided flat over the entire circumference so that the grounding width w was approximately 4 mm and the grounding diameter d was approximately 56 mm. A compressive strength test was conducted in the same manner as in Example 1.
Note that FIG. 7 is an enlarged end view of a main part of Comparative Example 2, showing a portion corresponding to the end surface shown in FIG. 4 of Example 1.

実施例1と同様にして内容物を充填密封した条件での縦圧縮強度は、約283Nであり、接地部と胴部の下端側に設けた周溝部が同時に座屈した。 The vertical compressive strength under the condition of filling and sealing the contents in the same manner as in Example 1 was about 283 N, and the ground contact portion and the circumferential groove portion provided at the lower end of the body buckled at the same time.

[比較例2]
図8に示すように、接地部51C及びその周辺を容器内方に部分的に隆起させてなる凹溝55Cを実施例1と同様の溝幅で設け、八つの凹溝55Cを周方向に沿って等間隔に配設した以外は、比較例1と同様の容器を作成した。
なお、図8は、実施例1の図4、図5にそれぞれ示した端面に相当する部位を図6と同様に重ねて示す、比較例2の要部拡大断面図である。
[Comparative example 2]
As shown in FIG. 8, grooves 55C formed by partially protruding the grounding portion 51C and its surroundings inward of the container are provided with the same groove width as in Example 1, and eight grooves 55C are formed along the circumferential direction. A container similar to Comparative Example 1 was prepared except that the containers were arranged at equal intervals.
Note that FIG. 8 is an enlarged sectional view of a main part of Comparative Example 2, in which portions corresponding to the end faces shown in FIGS. 4 and 5 of Example 1 are superimposed in the same way as FIG. 6.

実施例1と同様にして内容物を充填密封した条件で、圧縮強度試験を実施したところ、約270Nを超えたあたりから変形がはじまり、変形を確認した後、荷重を解除するとある程度復元した。しかし、復元後の接地部を観察すると、変形によって生じたと思われるシワ状の痕跡が認められ、実施例1のように、完全には復元しなかった。 When a compressive strength test was conducted under the conditions of filling and sealing the contents in the same manner as in Example 1, deformation began at around 270 N or more, and after confirming the deformation, when the load was released, it recovered to some extent. However, when the ground-contact area was observed after restoration, wrinkle-like traces that were thought to be caused by deformation were observed, and as in Example 1, the restoration was not complete.

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 by showing preferred embodiments, the present invention is not limited to the above-described embodiments, and it goes without saying that 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、加温販売に適した例を示したが、これに限定されない。この種の合成樹脂製容器において、軸方向に圧縮されたときに座屈が生じる箇所は、容器形状によっても異なるが、本発明は、中央に位置する陥没部と、この陥没部の周囲に設けられた接地部とを有する底部を備えた合成樹脂製容器において、軸方向に圧縮されたときに、接地部を起点とする座屈変形が生じてしまう場合の対策として、有効に適用することができる。 For example, in the embodiment described above, an example suitable for heating sales was shown, but the invention is not limited to this. In this type of synthetic resin container, the location where buckling occurs when compressed in the axial direction varies depending on the shape of the container, but the present invention provides a recess located in the center and a recess located around this recess. It can be effectively applied as a countermeasure against buckling deformation starting from the grounding part when compressed in the axial direction in a synthetic resin container with a bottom having a grounding part. can.

1 容器
5 底部
50 陥没部
51 接地部
52 ヒール部
53 傾斜面部
54 環状段差部
54a 第一段差面
54b 第二段差面
55 凹溝
55a 溝底部
1 Container 5 Bottom part 50 Recessed part 51 Ground contact part 52 Heel part 53 Inclined surface part 54 Annular step part 54a First step surface 54b Second step surface 55 Concave groove 55a Groove bottom part

Claims (2)

中央に位置する陥没部と、前記陥没部の周囲に設けられた接地部とを有する底部を備えた合成樹脂製容器であって、
前記接地部は、下方に向かって徐々に縮径する容器外方に凸の湾曲面からなるヒール部と、前記陥没部側から径方向外側に向かって下向きに傾斜する傾斜面部との間に、周方向に沿って延在し、
前記接地部と交差する複数の凹溝が放射状に形成され、
前記傾斜面部と前記陥没部との間に、前記傾斜面部側に位置する第一段差面と、前記第一段差面よりも上方に位置する第二段差面とを含む環状段差部が設けられ、
前記凹溝の溝底部が、前記環状段差部の前記第一段差面と面一に連なるように形成された
ことを特徴とする合成樹脂製容器。
A container made of synthetic resin, comprising a bottom portion having a depressed portion located at the center and a grounding portion provided around the depressed portion,
The ground contact portion is between a heel portion consisting of a curved surface convex to the outside of the container whose diameter gradually decreases downward, and an inclined surface portion that slopes downward from the depressed portion side toward the outside in the radial direction. Extending along the circumferential direction,
A plurality of grooves intersecting with the grounding portion are formed radially,
An annular stepped portion is provided between the inclined surface portion and the recessed portion, and includes a first stepped surface located on the inclined surface portion side and a second stepped surface located above the first stepped surface,
A synthetic resin container, wherein a groove bottom of the groove is formed to be flush with the first step surface of the annular step portion.
中央に位置する陥没部と、前記陥没部の周囲に設けられた接地部とを有する底部を備えた合成樹脂製容器であって、
前記接地部は、下方に向かって徐々に縮径する容器外方に凸の湾曲面からなるヒール部と、前記陥没部側から径方向外側に向かって下向きに傾斜する傾斜面部との間に、周方向に沿って延在し、
前記接地部と交差する複数の凹溝が放射状に形成され、
前記傾斜面部と前記陥没部との間に、前記傾斜面部側に位置する第一段差面と、前記第一段差面よりも上方に位置する第二段差面とを含む環状段差部が設けられ、
前記接地部及び前記第一段差面の間は、湾曲面によってなめらかに接続されており、
縦断面形状において、
前記傾斜面部のうち前記第一段差面側の円弧状の断面と、前記第一段差面の断面とは、接するように接続しており、
前記傾斜面部のうち前記接地部側の円弧状の断面と、前記接地部の断面とは、接するように接続されており、
前記第一段差面、前記第二段差面は、中心軸に直交する平面上に位置する
ことを特徴とする合成樹脂製容器。
A container made of synthetic resin, comprising a bottom portion having a depressed portion located at the center and a grounding portion provided around the depressed portion,
The ground contact portion is between a heel portion consisting of a curved surface convex to the outside of the container whose diameter gradually decreases downward, and an inclined surface portion that slopes downward from the depressed portion side toward the outside in the radial direction. Extending along the circumferential direction,
A plurality of grooves intersecting with the grounding portion are formed radially,
An annular stepped portion is provided between the inclined surface portion and the recessed portion, and includes a first stepped surface located on the inclined surface portion side and a second stepped surface located above the first stepped surface,
The ground contact portion and the first step surface are smoothly connected by a curved surface,
In the longitudinal cross-sectional shape,
The arc-shaped cross section on the first stepped surface side of the inclined surface portion and the cross section of the first stepped surface are connected so as to be in contact with each other,
An arc-shaped cross section of the inclined surface portion on the grounding portion side and a cross section of the grounding portion are connected so as to be in contact with each other,
The first step surface and the second step surface are located on a plane perpendicular to the central axis.
A synthetic resin container characterized by:
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JPH0716580Y2 (en) * 1988-05-18 1995-04-19 株式会社吉野工業所 Biaxially stretch blow molded bottle
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JP2012096798A (en) 2010-10-29 2012-05-24 Yoshino Kogyosho Co Ltd Synthetic resin round bottle body
JP2013079096A (en) 2011-10-04 2013-05-02 Daiwa Can Co Ltd Container made of synthetic resin
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