JP2019116289A - Synthetic resin container - Google Patents
Synthetic resin container Download PDFInfo
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- JP2019116289A JP2019116289A JP2017250497A JP2017250497A JP2019116289A JP 2019116289 A JP2019116289 A JP 2019116289A JP 2017250497 A JP2017250497 A JP 2017250497A JP 2017250497 A JP2017250497 A JP 2017250497A JP 2019116289 A JP2019116289 A JP 2019116289A
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- 229920003002 synthetic resin Polymers 0.000 title claims abstract description 17
- 239000000057 synthetic resin Substances 0.000 title claims abstract description 17
- 230000001747 exhibiting effect Effects 0.000 abstract 1
- 239000007788 liquid Substances 0.000 description 10
- -1 polyethylene terephthalate Polymers 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 6
- 230000004048 modification Effects 0.000 description 6
- 238000012986 modification Methods 0.000 description 6
- 229920005989 resin Polymers 0.000 description 5
- 239000011347 resin Substances 0.000 description 5
- 238000012669 compression test Methods 0.000 description 4
- 229920000139 polyethylene terephthalate Polymers 0.000 description 4
- 239000005020 polyethylene terephthalate Substances 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 229920005992 thermoplastic resin Polymers 0.000 description 3
- 238000000071 blow moulding Methods 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- 239000013585 weight reducing agent Substances 0.000 description 2
- LLLVZDVNHNWSDS-UHFFFAOYSA-N 4-methylidene-3,5-dioxabicyclo[5.2.2]undeca-1(9),7,10-triene-2,6-dione Chemical compound C1(C2=CC=C(C(=O)OC(=C)O1)C=C2)=O LLLVZDVNHNWSDS-UHFFFAOYSA-N 0.000 description 1
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 description 1
- 229920000747 poly(lactic acid) Polymers 0.000 description 1
- 229920001230 polyarylate Polymers 0.000 description 1
- 229920001707 polybutylene terephthalate Polymers 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 239000011112 polyethylene naphthalate Substances 0.000 description 1
- 239000004626 polylactic acid Substances 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Containers Having Bodies Formed In One Piece (AREA)
Abstract
Description
本発明は、軸荷重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 having an improved axial load 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容器が、各種飲料品を内容液とする飲料用容器として広い分野で一般的に利用されている。 Conventionally, various types of synthetic resin containers are used in which a bottomed cylindrical preform is formed using a thermoplastic resin such as polyethylene terephthalate and then this preform is formed into a bottle shape by biaxial stretch blow molding or the like. It is generally used in a wide field as a container for drinks which uses a drink as a content liquid.
この種の合成樹脂製容器にあっては、従前より、その軽量化や、使用樹脂量の削減による低コスト化のために、可能な限り容器を薄肉に成形する試みがなされているものの、単に容器を薄肉にしただけでは、薄肉にした分だけ容器の剛性が損なわれてしまう。そうすると、例えば、容器に内容液を充填密封して出荷した後、その搬送や、保管の際に積み重ねられることが多々あり、そのときに軸方向に荷重が加わると、その荷重に耐えきれずに容器が座屈変形してしまい、商品価値を著しく損ねてしまうという問題がある。 In this type of synthetic resin container, although attempts have been made to make the container as thin as possible for the purpose of weight reduction and cost reduction due to the reduction of the amount of resin used, it has been simple. If the container is made thin, the rigidity of the container will be lost by the amount made thin. Then, for example, after the container is filled and sealed with the content liquid and shipped, it is often stacked during transportation or storage, and when a load is applied in the axial direction at that time, it can not stand the load. There is a problem that the container is deformed by buckling, which significantly reduces the commercial value.
このような問題を解決するために、例えば、特許文献１では、いわゆる、角形ボトルにおいて、容器胴部に環状溝を設けるとともに、当該環状溝の溝壁をアーチ状に形成して、軸方向に加わる荷重を分散させるようにすることによって、座屈強度を高めようとしている。 In order to solve such a problem, for example, in Patent Document 1, in a so-called square bottle, an annular groove is provided in the container body, and a groove wall of the annular groove is formed in an arch shape to extend in the axial direction By dispersing the applied load, it is intended to increase the buckling strength.
しかしながら、特許文献１の実施例に示されているように、いくら座屈強度を高めたとしても、軸方向に加わる荷重によって、容器が押し縮められるように変位してしまうのは避けられず、容器に内容液が充填密封された状態で、容器が押し縮められるように変位すると、容器胴部が内側から押されるようにして膨らんでしまう。 However, as shown in the embodiment of Patent Document 1, even if the buckling strength is increased, it is inevitable that the container is displaced so as to be compressed due to the load applied in the axial direction, If the container is displaced so as to be compressed while the container is filled and sealed with the content liquid, the container body bulges as it is pushed from the inside.
そこで、本発明者らは、この点に着目して、近年、益々厳しくなってきている容器の軽量化、薄肉化の要求に応えるべく鋭意検討を重ねたところ、容器に内容液が充填密封された状態で、軸方向に加わる荷重によって容器が押し縮められるように変位するのを許容し、その際に容器胴部が膨らんでしまうのを抑制することで、容器内の圧力を高めて、軸方向の圧縮強度（軸荷重強度）を向上させることができることを見出し、本発明を完成するに至った。 Therefore, the present inventors focused their attention on this point, and in earnestly studied in order to meet the demand for lighter weight and thinner thickness of containers which are becoming more and more severe in recent years, the container is filled with the content liquid and sealed. In this state, the pressure applied in the container is increased by allowing the container to be displaced so as to be compressed by the load applied in the axial direction, thereby suppressing expansion of the container body. It has been found that the compressive strength (axial load strength) in the direction can be improved, and the present invention has been completed.
すなわち、本発明は、容器の軽量化、薄肉化の要求の下、軸荷重強度を向上させた合成樹脂製容器を提供することを目的とする。 That is, an object of the present invention is to provide a synthetic resin container in which axial load strength is improved under the demand for weight reduction and thickness reduction of the container.
本発明に係る合成樹脂製容器は、口部、肩部、胴部、及び底部を備え、前記胴部の横断面形状が多角形状の角筒状に形成された合成樹脂製容器であって、前記胴部が、内圧調整パネルを有するとともに、周方向に沿って形成された一以上の凹溝部を有し、前記凹溝部が形成された部位の横断面形状が、前記胴部の角筒状に形成された部位の横断面形状に相似し、かつ、前記凹溝部が形成された部位の横断面形状と、前記胴部の角筒状に形成された部位の横断面形状とを同一平面上で重ねたときに、前記凹溝部が形成された部位の横断面形状の各頂部が、前記胴部の角筒状に形成された部位の横断面形状の各辺に内接する位置関係にあるように、前記凹溝部が形成されている構成としてある。 A container made of synthetic resin according to the present invention is a container made of synthetic resin, which has a mouth, a shoulder, a body, and a bottom, and the body is formed in a rectangular tube shape having a polygonal cross section. The body has an internal pressure adjustment panel, and has one or more recessed grooves formed along the circumferential direction, and the cross-sectional shape of the portion where the recessed groove is formed is a square cylinder of the body. Similar to the cross-sectional shape of the portion formed on the same plane, and the cross-sectional shape of the portion where the recessed groove portion is formed and the cross-sectional shape of the portion formed in the rectangular cylinder shape of the body on the same plane When overlapping, each apex of the cross-sectional shape of the portion where the recessed groove portion is formed is inscribed in the lateral cross-sectional shape so as to be inscribed in each corner of the rectangular cylindrical portion of the body portion. In the above, the concave groove portion is formed.
本発明によれば、容器に内容液が充填密封された状態で、軸方向に加わる荷重によって容器が押し縮められるように変位するのを許容し、その際に容器胴部が膨らんでしまうのを抑制することで、容器内の圧力を高めて、軸荷重強度を向上させることができる。 According to the present invention, in a state in which the container is filled and sealed with the content liquid, it is permitted that the container is displaced so as to be compressed and contracted by the load applied in the axial direction, and the container body is expanded at that time. By suppressing the pressure in the container can be increased, and the axial load strength can be improved.
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.
本発明に係る合成樹脂製容器の一実施形態として、その斜視図を図１に示し、その正面図を図２に示す。
また、図２のＡ−Ａ線を含む水平面によって容器１を切り取った断面にあらわれる端面を図３に示し、図２のＢ−Ｂ線を含む水平面によって容器１を切り取った断面にあらわれる端面を図４に示す。
なお、これらの端面図では、容器１の肉厚を省略している。
As one embodiment of a synthetic resin container according to the present invention, a perspective view thereof is shown in FIG. 1, and a front view thereof is shown in FIG.
Further, FIG. 3 shows an end face appearing in a cross section obtained by cutting the container 1 along a horizontal plane including the line A-A in FIG. 2, and an end face appearing in a cross section obtained by cutting the container 1 along a horizontal plane including the line B-B in FIG. Shown in 4.
In these end views, the thickness of the container 1 is omitted.
容器１は、口部２、肩部３、胴部４、及び底部５を備えており、本発明の一実施形態として図示する容器１は、胴部４が角筒状に形成された、一般に、角形ボトルと称される容器形状を有している。
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。
The container 1 is provided with a mouth 2, a shoulder 3, a body 4, and a bottom 5. The container 1 shown as an embodiment of the present invention has a body 4 formed in a square tube shape in general. , Has a container shape called a square bottle.
Such a container 1 is formed into a bottomed cylindrical preform by injection molding, compression molding or the like using a thermoplastic resin, and is formed into a predetermined container shape by biaxial stretch 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。 In manufacturing the container 1, any resin that can be blow-molded can be used as the thermoplastic resin to be used. Specifically, thermoplastic polyesters such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, amorphous polyarylate, polylactic acid, and copolymers thereof, and those blended with these resins or other resins are preferable. It is. In particular, ethylene terephthalate thermoplastic polyesters such as polyethylene terephthalate are suitably used. Further, polycarbonate, acrylonitrile resin, polypropylene, propylene-ethylene copolymer, polyethylene and the like can also be used.
口部２は、内容液の注入出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、図示しない蓋体を螺着によって取り付けるためのねじ山が設けられているが、螺着に限らず、打栓などによって蓋体を取り付けるようにしてもよい。
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り、図示する例において、肩部３は、概ね角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 mouth portion 2 is a cylindrical portion which is an injection outlet for the content liquid. Although a screw thread for attaching a lid (not shown) by screwing is provided on the side surface on the opening end side of the mouth portion 2, the lid is attached not only by screwing but also by tapping. It is also good.
The shoulder portion 3 is a portion connected to the lower end of the mouth portion 2 and enlarged in diameter toward the trunk portion 4 to connect the mouth portion 2 and the trunk portion 4, and in the illustrated example, the shoulder portion 3 is It is generally shaped like a truncated pyramid.
The body 4 is a portion that occupies most of the height direction of the container 1, the upper end is connected to the shoulder 3, and the lower end is connected to the bottom 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。 Here, the height direction refers to the direction orthogonal to the horizontal plane when the container 1 is erected on the horizontal plane with the mouth 2 up, and in this state, the vertical and horizontal directions of the container 1 and the horizontal and vertical directions Shall be defined.
本実施形態において、胴部４は、その横断面形状（高さ方向に直交する断面の形状）が正方形状を基本形状として、角部がＣ面取り状に面取りされた角筒状に形成されており、面取りされた面を含めると八角形状の横断面形状とされている。
なお、胴部４の角部を面取りする際の面取り幅は、角部を面取りした後に残る胴部４の側面の横幅以下とし、面取りされた面との境界には、図示するような微小のＲをつけてもよい。
In the present embodiment, the body 4 is formed into a square cylinder whose corner portion is chamfered in a C-chamfered shape, with the cross-sectional shape (shape of the cross section orthogonal to the height direction) being a square as a basic shape. It has an octagonal cross-sectional shape including the chamfered surface.
In addition, the chamfering width at the time of chamfering the corner of the body 4 is made equal to or less than the lateral width of the side of the barrel 4 remaining after chamfering the corner, and in the boundary with the chamfered surface, You may put R.
また、胴部４は、内容液を充填密封する際の容器内の圧力変化を調整するための内圧調整パネル４Ｐを有している。内圧調整パネル４Ｐの具体的な形態は、所望の機能が発揮されれば特に限定されない。 The body 4 also has an internal pressure adjustment panel 4P for adjusting a pressure change in the container when filling and sealing the content liquid. The specific form of the internal pressure adjustment panel 4P is not particularly limited as long as the desired function is exhibited.
さらに、胴部４は、その周方向に沿って形成された凹溝部４０を有している。
図示する例では、二つの凹溝部４０が、胴部４の高さ方向中央と底部５側とに形成されており、それぞれの凹溝部４０が形成された部位の横断面形状（図４参照）が、胴部４の角筒状に形成された部位の横断面形状（図３参照）に相似するように形成される。そして、図５に示すように、凹溝部４０が形成された部位の横断面形状と、胴部４の角筒状に形成された部位の横断面形状とを同一平面で重ねたときに、いずれの凹溝部４０も、凹溝部４０が形成された部位の横断面形状の各頂部４０Ａが、胴部４の角筒状に形成された部位の横断面形状の各辺に内接する位置関係にあるように形成されている。
Furthermore, the body 4 has a recessed groove 40 formed along the circumferential direction.
In the illustrated example, two concave grooves 40 are formed at the center in the height direction of the body 4 and the bottom 5 side, and the cross-sectional shape of the portion where the respective concave grooves 40 are formed (see FIG. 4) Is formed to be similar to the cross-sectional shape (see FIG. 3) of the portion of the body 4 which is formed in a square tube shape. Then, as shown in FIG. 5, when the cross-sectional shape of the portion where the recessed groove portion 40 is formed and the cross-sectional shape of the portion formed in the rectangular cylinder shape of the trunk 4 overlap in the same plane, In the concave groove portion 40, the respective apexes 40A of the cross sectional shape of the portion where the concave groove portion 40 is formed is inscribed in a manner inscribed in the sides of the cross sectional shape of the rectangular cylindrical portion of the trunk 4 It is formed as.
本実施形態では、胴部４の角筒状に形成された部位の横断面形状が、正方形状を基本形状として、その各頂部４ＡがＣ面取り状に面取りされた形状とされていることから、凹溝部４０が形成された部位も、正方形状を基本形状として、その各頂部４０ＡがＣ面取り状に面取りされた横断面形状となるように形成されている。そして、凹溝部４０が形成された部位の横断面形状の面取りされた頂部４０Ａが、胴部４の側面の横幅方向中央部に位置するとともに、胴部４の側面と面一な部位を含んでいる。 In the present embodiment, since the cross-sectional shape of the portion formed in a square tube shape of the trunk portion 4 has a square shape as a basic shape, the respective top portions 4A are chamfered in a C-chamfered shape, The portion where the recessed groove portion 40 is formed is also formed to have a cross-sectional shape in which each top portion 40A is chamfered in a C-chamfered shape, with a square shape as a basic shape. Then, the chamfered top portion 40A of the cross-sectional shape of the portion where the recessed groove portion 40 is formed is located in the lateral width direction central portion of the side surface of the trunk portion 4 and includes a portion flush with the side surface of the trunk portion 4 There is.
このような本実施形態によれば、容器１に内容液が充填密封された状態で軸方向に押し縮められるように変位する際に、胴部４が膨らむように変形してしまうのを有効に抑制することができるが、その理由は次の通りである。 According to such this embodiment, when the container 1 is filled and sealed with the content liquid and displaced so as to be compressed in the axial direction, it is effective that the body 4 is deformed so as to expand. Although it can suppress, the reason is as follows.
すなわち、容器１に内容液が充填密封された状態で軸方向に押し縮められるように変位すると、容器１の内容積の減少に伴って容器内の圧力が高まり、それを吸収するように、胴部４の角筒状に形成された部位では、胴部４の側面に、容器外方に膨らむように変形させようとする力が作用する。一方、凹溝部４０が形成された部位では、その横断面形状の各頂部４０Ａに相当する部位には、容器内方に引き込むように変形させる力が作用する。
そして、図５に、それぞれの力の向きを矢印で示すように、これらの力が相殺され、胴部４の変形が抑制される。
That is, when the container 1 is displaced so as to be compressed in the axial direction in a state in which the content liquid is filled and sealed in the container 1, the pressure in the container is increased as the internal volume of the container 1 is reduced. In the rectangular cylindrical portion of the portion 4, a force acts on the side surface of the body 4 so as to be deformed so as to expand outward of the container. On the other hand, at the portion where the recessed groove portion 40 is formed, a force that causes deformation so as to be drawn inward of the container acts on the portions corresponding to the respective tops 40A of the cross sectional shape.
Then, as shown by arrows in FIG. 5, the directions of the respective forces are offset, and the deformation of the body 4 is suppressed.
このように、本実施形態にあっては、凹溝部４０が形成された部位の横断面形状が、胴部４の角筒状に形成された部位の横断面形状に相似し、かつ、凹溝部４０が形成された部位の横断面形状の各頂部４０Ａが、胴部４の角筒状に形成された部位の横断面形状の各辺に内接する位置関係にあるように、凹溝部４０を形成することによって、凹溝部４０が形成された部位に作用する力によって、胴部４の角筒状に形成された部位に作用する力が相殺されるようにすることができる。 As described above, in the present embodiment, the cross-sectional shape of the portion where the recessed groove portion 40 is formed is similar to the cross-sectional shape of the portion formed in the rectangular cylinder shape of the trunk portion 4 and the recessed groove portion The recessed groove portion 40 is formed such that each apex 40A of the cross-sectional shape of the portion where the 40 is formed is inscribed in each side of the cross-sectional shape of the portion formed in a square cylinder of the trunk 4 By doing this, the force acting on the rectangular tube-shaped portion of the body 4 can be offset by the force acting on the portion where the recessed groove portion 40 is formed.
その結果、容器に内容液が充填密封された状態で、容器が押し縮められるように変位しても、その際に胴部４が膨らんでしまうのを抑制することができ、これによって、容器内の圧力を高めて、軸荷重強度を向上させることができることが可能になる。 As a result, even if the container is displaced so as to be compressed and compressed in a state in which the content liquid is filled and sealed in the container, it is possible to suppress the swelling of the body portion 4 at that time, thereby the inside of the container It is possible to increase the axial load strength by increasing the pressure of
ここで、本発明でいう「相似」とは、数学における狭義の「相似」のみを意味するものではない。凹溝部４０が形成された部位の横断面形状の各頂部４０Ａが、胴部４の角筒状に形成された部位の横断面形状の各辺に内接する位置関係にあることで、胴部４の角筒状に形成された部位に作用する力を相殺できれば、凹溝部４０が形成された部位の横断面形状と、胴部４の角筒状に形成された部位の横断面形状とは、それぞれの基本形状が、同数の辺、同数の頂部を有する同様の多角形状と認識できる程度に類似していればよい。 Here, “similarity” in the present invention does not mean only “similarity” in a narrow sense in mathematics. Since each apex 40A of the cross-sectional shape of the portion where the recessed groove portion 40 is formed is inscribed in the lateral cross-sectional shape of the portion formed in the rectangular cylinder shape of the trunk portion 4, the trunk portion 4 If it is possible to offset the force acting on the portion formed in the rectangular tube shape, the cross sectional shape of the portion in which the recessed groove portion 40 is formed and the cross sectional shape of the portion formed in the rectangular tube shape of the trunk portion 4 are Each basic shape should be similar to the extent that it can be recognized as a similar polygonal shape having the same number of sides and the same number of apexes.
例えば、図６に示すように、凹溝部４０が形成された部位の横断面形状が、胴部４の角筒状に形成された部位の横断面形状と同様に正方形状を基本形状として、その各頂部４０ＡをＣ面取り状に面取りして、面取りされた頂部４０Ａが、胴部４の側面の横幅方向中央部に位置するとともに、胴部４の側面と面一な部位を含むように設計した上で、凹溝部４０が形成された部位の横断面形状の各辺が、容器外方に凸となる円弧状となるように設計を適宜修正して、凹溝部４０を形成してもよい。 For example, as shown in FIG. 6, the cross-sectional shape of the portion where the recessed groove portion 40 is formed has a square shape as a basic shape similarly to the cross-sectional shape of the portion formed in a square tube shape of the trunk portion 4 Each apex 40A is chamfered in a C-chamfered shape, and the chamfered apex 40A is designed to be located at the center in the lateral width direction of the side of the body 4 and to include a portion flush with the side of the body 4 The recessed groove portion 40 may be formed by appropriately modifying the design so that each side of the cross-sectional shape of the portion where the recessed groove portion 40 is formed has an arc shape which is convex toward the outside of the container.
なお、図６は、本実施形態の変形例について、図５に対応させて、容器１の胴部４の角筒状に形成された部位の横断面形状と、凹溝部４０が形成された部位の横断面形状とを重ねて示す説明図である。 6 corresponds to FIG. 5 about the modification of this embodiment, the cross-sectional shape of the site | part formed in the rectangular cylinder shape of the trunk | drum 4 of the container 1, and the site | part in which the ditch | groove part 40 was formed. It is explanatory drawing which piles up and shows the cross-sectional shape of.
また、図７に示すように、凹溝部４０が形成された部位の横断面形状の頂部４０Ａは、Ｃ面取り状に面取りするのに代えて、Ｒ面取り状に面取りしてもよい。
すなわち、胴部４の角筒状に形成された部位の横断面形状を、正方形状を基本形状として、その各頂部４ＡをＣ面取り状に面取りした形状とし、これに対して、凹溝部４０が形成された部位については、正方形状を基本形状として、その各頂部４０ＡがＲ面取り状に面取りされた横断面形状となるように形成してもよい。この場合、特に図示しないが、図６に示す変形例のように、凹溝部４０が形成された部位の横断面形状の各辺が、容器外方に凸となる円弧状となるようにしてもよい。
Further, as shown in FIG. 7, the top 40A of the cross-sectional shape of the portion where the recessed groove portion 40 is formed may be chamfered in an R-chamfered shape instead of chamfered in a C-chamfered shape.
That is, the cross-sectional shape of the portion formed in a square tube shape of the body 4 is a square shape as a basic shape, and the respective top portions 4A are chamfered in a C-chamfered shape, while the concave groove portion 40 is The formed portion may be formed to have a square shape as a basic shape and to have a cross-sectional shape in which each apex 40A is chamfered in an R-chamfered manner. In this case, although not shown in particular, even if each side of the cross-sectional shape of the portion where the recessed groove portion 40 is formed has an arc shape which is convex outward of the container as in the modification shown in FIG. Good.
なお、図７は、本実施形態の他の変形例について、図５に対応させて、容器１の胴部４の角筒状に形成された部位の横断面形状と、凹溝部４０が形成された部位の横断面形状とを重ねて示す説明図である。 In addition, FIG. 7 makes the cross-sectional shape of the site | part formed in the square cylinder shape of the trunk | drum 4 of the container 1, and the ditch | groove part 40 corresponding to FIG. 5 about the other modification of this embodiment. It is explanatory drawing which piles up and shows the cross-sectional shape of the said site | part.
また、胴部４の側面を容器外方に膨らむように変形させようとする力を相殺して、胴部４の側面の膨らみを抑制する上で、凹溝部４０の頂部が胴部４の側面の横幅方向中央部に位置するように、凹溝部４０を形成するのが好ましいが、これに限定されない。 The top of the recessed groove 40 is the side surface of the trunk 4 in order to offset the force to deform the side of the trunk 4 so that the side of the trunk 4 bulges outward. It is preferable to form the recessed groove portion 40 so as to be located at the central portion in the width direction of the belt, but is not limited thereto.
また、図示する例では、胴部４の高さ方向中央と底部５側とに、二つの凹溝部４０を形成しているが、これに限定されない。胴部４が膨らむように変形してしまうのを抑制できれば、胴部４には、一以上の凹溝部４０が形成されていればよく、容器１の容量や大きさなどに応じて適宜変更することができる。 Moreover, in the example to show in figure, although the two recessed groove parts 40 are formed in the height direction center and the bottom part 5 side of the trunk | drum 4, it is not limited to this. One or more concave grooves 40 may be formed in the body 4 if the deformation of the body 4 so as to expand can be suppressed, and it is appropriately changed according to the capacity, size, etc. of the container 1 be able to.
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 described in more detail by way of specific examples.
［実施例１］
ポリエチレンテレフタレートを使用して作成された重量約２０ｇのプリフォームを用いて、図１及び図２に示す容器１を得た（胴部４の角筒状に形成された部位の横断面形状と、凹溝部４０が形成された部位の横断面形状については、図３、図４、及び図５参照）。得られた容器１の寸法は、高さＨが約２００ｍｍ、横幅Ｗが約６０ｍｍ、対角幅Ｄが７０ｍｍであった。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０．２ｍｍであった。
得られた容器１に、約２０℃の水を内容液として、これを大気圧下で約５００ｍＬ充填し、口部２に図示しない蓋体を取り付けて密封した。容器１内に残されたヘッドスペースの容積を常温（約２０℃）で測定したところ、約２０ｍＬであった。
次いで、正立している容器１に対して、軸方向上方から圧縮スピード５０ｍｍ／分で荷重を加えて圧縮試験を行った。得られた変位−荷重曲線を図８に示す。
Example 1
A container 1 shown in FIG. 1 and FIG. 2 was obtained using a preform having a weight of about 20 g prepared using polyethylene terephthalate (the cross-sectional shape of the rectangular cylindrical portion of the body 4; About the cross-sectional shape of the site | part in which the ditch | groove part 40 was formed, refer FIG.3, FIG.4, and FIG.5). The dimensions of the obtained container 1 were a height H of about 200 mm, a lateral width W of about 60 mm, and a diagonal width D of 70 mm. The average thickness of the container 1 calculated from the weight of the preform was about 0.2 mm.
About 500 mL of the obtained container 1 was filled with water at about 20 ° C. as a content solution at atmospheric pressure, and a lid (not shown) was attached to the mouth 2 for sealing. It was about 20 mL when the volume of the head space left in the container 1 was measured at normal temperature (about 20 degreeC).
Then, a load was applied to the erected container 1 from above in the axial direction at a compression speed of 50 mm / min to conduct a compression test. The resulting displacement-load curve is shown in FIG.
［実施例２］
胴部４の角筒状に形成された部位の横断面形状と、凹溝部４０が形成された部位の横断面形状とを、図６に示すような横断面形状とした以外は、実施例１と同様にして、得られた容器について圧縮試験を行った。得られた変位−荷重曲線を図８に示す。
Example 2
Example 1 except that the cross-sectional shape of the portion of the body 4 which is formed in a square tube shape and the cross-sectional shape of the portion where the recessed groove portion 40 is formed are as shown in FIG. In the same manner, the compression test was performed on the obtained container. The resulting displacement-load curve is shown in FIG.
［比較例１］
胴部４ｃの角筒状に形成された部位の横断面形状と、凹溝部４０ｃが形成された部位の横断面形状とを、図９に示すような横断面形状とした以外は、実施例１と同様にして、得られた容器について圧縮試験を行った。得られた変位−荷重曲線を図８に示す。
なお、図９は、比較例１について、図５に対応させて、胴部４ｃの角筒状に形成された部位の横断面形状と、凹溝部４０ｃが形成された部位の横断面形状とを重ねて示す説明図である。図９に示すように、比較例１では、凹溝部４０ｃが形成された部位の横断面形状が、胴部４ｃの角筒状に形成された部位の横断面形状に相似するが、凹溝部４０ｃが形成された部位の横断面形状の各頂部４０ｃＡが、胴部４ｃの角筒状に形成された部位の横断面形状の各頂部４ｃＡと同じ対角位置にあるように、凹溝部４０ｃを形成した。
Comparative Example 1
Example 1 except that the cross-sectional shape of the portion of the body 4c formed in a square tube shape and the cross-sectional shape of the portion where the recessed groove portion 40c is formed are as shown in FIG. In the same manner, the compression test was performed on the obtained container. The resulting displacement-load curve is shown in FIG.
9 corresponds to FIG. 5 about the cross-sectional shape of the part formed in the rectangular cylinder shape of the trunk | drum 4c, and the cross-sectional shape of the part in which the ditch | groove part 40c was formed about Comparative Example 1 as FIG. FIG. As shown in FIG. 9, in Comparative Example 1, the cross-sectional shape of the portion where the recessed groove portion 40c is formed is similar to the cross-sectional shape of the portion formed in a square cylinder of the body portion 4c, but the recessed groove portion 40c The recessed groove 40c is formed so that each apex 40cA of the cross-sectional shape of the portion where the portion is formed is at the same diagonal position as each apex 4cA of the cross-sectional shape of the rectangular cylindrical portion of the body 4c. did.
図８に示す変位−荷重曲線からも解るように、比較例１よりも、実施例１，２の方が、同じ荷重に対する変位が少なく、軸荷重強度が向上している。
また、１０ｍｍ変位時の容器内の圧力を測定したところ、充填密封時の圧力（大気圧）に比べて、実施例１が４６ｍｍＨｇ、実施例２が５３ｍｍＨｇ、比較例１が３２ｍｍＨｇ上昇しており、変位時の容器内の圧力が高くなるにつれて、軸荷重強度が向上していることが確認できた。
As can be understood from the displacement-load curve shown in FIG. 8, the displacement with respect to the same load is smaller in Examples 1 and 2 than in Comparative Example 1, and the axial load strength is improved.
In addition, when the pressure in the container at 10 mm displacement was measured, the pressure in Example 1 was 46 mmHg, Example 2 was 53 mmHg, and Comparative Example 1 was 32 mmHg as compared to the pressure (atmospheric pressure) in filling and sealing. It was confirmed that the axial load strength was improved as the pressure in the container at the time of displacement increased.
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 with reference to the preferred embodiments, the present invention is not limited to the above-described embodiments, and various modifications may be made within the scope of the present invention. Nor.
１ 容器
２ 口部
３ 肩部
４ 胴部
４Ａ 胴部の角筒状に形成された部位の横断面形状の頂部
４Ｐ 内圧調整パネル
４０ 凹溝部
４０Ａ 凹溝部が形成された部位の横断面形状の頂部
５ 底部
DESCRIPTION OF SYMBOLS 1 container 2 mouth part 3 shoulder part 4 trunk | drum 4A cross-section top of cross-sectionally formed part of square cylinder shape 4P internal pressure adjustment panel 40 recessed groove part 40A cross-section top of cross sectional shape formed of recessed groove part 5 bottom
Claims (3)
前記胴部が、内圧調整パネルを有するとともに、周方向に沿って形成された一以上の凹溝部を有し、
前記凹溝部が形成された部位の横断面形状が、前記胴部の角筒状に形成された部位の横断面形状に相似し、かつ、前記凹溝部が形成された部位の横断面形状と、前記胴部の角筒状に形成された部位の横断面形状とを同一平面上で重ねたときに、前記凹溝部が形成された部位の横断面形状の各頂部が、前記胴部の角筒状に形成された部位の横断面形状の各辺に内接する位置関係にあるように、前記凹溝部が形成されていることを特徴とする合成樹脂製容器。 A container made of synthetic resin, comprising a mouth, a shoulder, a body, and a bottom, wherein the body has a polygonal cross section, and is formed in a polygonal tube shape,
The body has an internal pressure control panel and one or more recessed grooves formed along the circumferential direction,
The cross-sectional shape of the portion where the recessed groove portion is formed is similar to the cross-sectional shape of the portion formed in a square tube shape of the body portion, and the cross-sectional shape of the portion where the recessed groove portion is formed; When the cross-sectional shape of the rectangular tubular portion of the body portion is overlapped on the same plane, each apex of the cross-sectional shape of the portion where the recessed groove portion is formed is a square tube of the body portion A container made of synthetic resin, wherein the recessed groove portion is formed so as to be in a positional relationship inscribed in each side of the cross-sectional shape of the portion formed in the shape of a circle.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01147908U (en) * | 1988-04-01 | 1989-10-13 | ||
| JP2008030843A (en) * | 2006-07-31 | 2008-02-14 | Yoshino Kogyosho Co Ltd | Container for freezing |
| JP2009298485A (en) * | 2008-06-16 | 2009-12-24 | Sidel Participations | Container, especially bottle, with at least one groove of variable depth |
| JP2011136705A (en) * | 2009-12-25 | 2011-07-14 | Suntory Holdings Ltd | Bottle and bottle having content |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP1568424S (en) | 2016-07-07 | 2017-02-06 | ||
| JP6597770B2 (en) | 2017-12-28 | 2019-10-30 | 東洋製罐株式会社 | Plastic container |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01147908U (en) * | 1988-04-01 | 1989-10-13 | ||
| JP2008030843A (en) * | 2006-07-31 | 2008-02-14 | Yoshino Kogyosho Co Ltd | Container for freezing |
| JP2009298485A (en) * | 2008-06-16 | 2009-12-24 | Sidel Participations | Container, especially bottle, with at least one groove of variable depth |
| JP2011136705A (en) * | 2009-12-25 | 2011-07-14 | Suntory Holdings Ltd | Bottle and bottle having content |
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