JP4190247B2 - Hollow resin container - Google Patents

Hollow resin container Download PDF

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Publication number
JP4190247B2
JP4190247B2 JP2002292018A JP2002292018A JP4190247B2 JP 4190247 B2 JP4190247 B2 JP 4190247B2 JP 2002292018 A JP2002292018 A JP 2002292018A JP 2002292018 A JP2002292018 A JP 2002292018A JP 4190247 B2 JP4190247 B2 JP 4190247B2
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Japan
Prior art keywords
resin container
hollow resin
deformation
container
hollow
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JP2002292018A
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Japanese (ja)
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JP2004123197A (en
Inventor
政志 矢野
義雄 川関
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Kao Corp
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Kao Corp
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Description

【0001】
【発明の属する技術分野】
本発明は、ブロー成形によって形成される中空樹脂容器に関し、特に容器の内圧の変化による変形を吸収するようにした中空樹脂容器に関する。
【0002】
【従来の技術】
清涼飲料水等の飲料品の他、液体状或いは粉粒体状の食品、洗浄剤、薬品等、各種の内容物を収容する容器として、例えば樹脂ボトル容器等の中空樹脂容器が多用されている。このような中空樹脂容器としては、その強度や成形性、収容される内容物の物性等に応じて、種々の形状、大きさ、硬さ等を備える容器が選択使用されることになる。
【0003】
清涼飲料水等の飲料品を収容する中空樹脂容器としては、二軸延伸ブロー成形により形成されたポリエチレンテレフタレート(PET)製の樹脂容器が用いられるのが一般的である。また、このようなPET製の樹脂容器は、例えば高温加熱殺菌を必要とする内容物を収容する場合、高温加熱された内容物の充填後や、充填した内容物の加熱中に、加熱又は冷却による熱変形を生じやすい。このような熱変形を吸収して容器の外観が損なわれないようにした中空樹脂容器が知られており(例えば、特許文献1参照)、この特許文献1に記載の樹脂容器によれば、容器の胴部の各側壁には、内圧の変化を吸収するためのパネル壁がそれぞれ設けられており、このパネル壁は、側壁の平坦部分を矩形状に凹溝で囲んで形成され、且つ矩形の中心に設けた船底状の底稜線の両端からV字状に矩形状凹溝の隅部に達する一対の傾斜稜線を形成して、圧力変形可能な窪み壁としたものである。
【0004】
【特許文献1】
特開平8−276924号公報(第2−3頁、図1、図2、図7)
【0005】
【発明が解決使用とする課題】
特許文献1に記載の圧力変形可能な窪み壁を設けた樹脂容器によれば、二軸延伸ブロー成形により形成されたPET製の中空容器であって、樹脂弾性率が例えば3000MPa程度の樹脂から得られる硬い材質の中空容器であるため、上述のように配置されたパネル壁によって、加熱又は冷却による内圧の変化に伴う変形を効果的に吸収することが可能である。
【0006】
しかしながら、例えば液体洗剤、柔軟剤、食用油等を収容するための樹脂容器であって、樹脂弾性率が200〜1500MPa程度の樹脂として例えばポリエチレン(PE)を用いた軟らかい材質の中空樹脂容器の場合、加熱又は冷却による内圧の変化の他、例えば内容物の酸化等の化学変化による加圧や減圧が生じて圧力変形が大きくなると、当該パネル壁によって充分に変形を吸収することができなくなり、パネル壁の変形が外観形状に現れる程度に大きくなると共に、パネル壁以外の部分にも変形が生じて外観形状を保持できなくなるおそれがある。
【0007】
本発明は、特に樹脂弾性率が200〜1500MPaの樹脂を用いて形成した樹脂容器においても、内圧の変化に伴う変形を効果的に吸収して、外観形状を容易に保持することのできる中空樹脂容器を提供することを目的とする。
【0008】
【課題を解決するための手段】
本発明は、ブロー成形によって形成される中空樹脂容器であって、容器の内圧の変化による変形を吸収する変形吸収パネル部をその胴部に備えており、該変形吸収パネル部は、略寄棟屋根形状の凸部又は凹部を複数連接配置して構成されている中空樹脂容器を提供することにより、上記目的を達成したものである。
【0009】
本願において、略寄棟屋根形状は、図6に示すような、大棟50の両端に四つの隅棟51が会する形式の屋根である寄棟屋根52と略同様の形状又はこれと類似の形状を意味するものである。また、略寄棟屋根形状の各稜線は、直線状の他、円弧状に湾曲する形状であっても良く、各稜線による山又は谷の先端は、R形状に面取りされたものであっても良い。
【0010】
そして、本発明の中空樹脂容器によれば、略寄棟屋根形状の凸部又は凹部を正面から視た場合の隣接する一対の隅棟稜線間の角度α(図3参照)が120度以上、大棟稜線と隅棟稜線間の角度β(図3参照)が120度以下となっており、従ってα≧βとなっていることが好ましい。一対の隅棟稜線間の角度αが120度以上、大棟稜線と隅棟稜線間の角度βが120度以下であることにより、内圧の変化に伴う変形を一部に集中させることなく均等に分散させて効果的に吸収することが可能になる。
【0011】
また、本発明の中空樹脂容器によれば、略寄棟屋根形状の凸部又は凹部の大棟稜線と垂直な方向の断面A−A(図3参照)に沿った両側の傾斜面の接合角度γ(図4参照)が90度以上となっていることが好ましい。大棟稜線を挟んだ両側の傾斜面の接合角度γが90度以上であることにより、内圧の変化に伴う変形を一部に集中させることなく均等に分散させて効果的に吸収することが可能になる。
【0012】
【発明の実施の形態】
図1及び図2に示す本発明の好ましい一実施形態に係る中空樹脂容器10は、曲げ弾性率(JIS K 7106)、片持ちばりによるプラスチックの曲げこわさ試験法に従って測定された樹脂弾性率が200〜1500MPaの熱可塑性樹脂として、例えば中密度ポリエチレンを用いてダイレクトブロー成形により得られた直径50〜90mm程度の円形断面を有するボトル状の樹脂容器である。また本実施形態の中空樹脂容器10は、例えば200〜700cc程度の容量を有し、内容物として、例えば環境変化や経時変化によってガスを発生する性質を有する漂白剤等や、酸素を吸収する性質を有する食用油等が収容され、封止された容器10の内部に加圧や減圧を生じさせることになる。
【0013】
そして、本実施形態の中空樹脂容器10によれば、容器10の内圧の変化による変形を吸収する変形吸収パネル部11をその胴部12に備えており、変形吸収パネル部11は、略寄棟屋根形状の凹部13を複数連接配置して構成されている。
【0014】
また、本実施形態によれば、中空樹脂容器10は、先端ノスル部15、肩部16、胴部12、底部17、及び上げ底部を一体として備えており、また胴部12は、シュリンクラベルが取り付けられるラベル部18と、ラベル上方部19及びラベル下方部20とからなっている。なお、本実施形態によれば、中空樹脂容器10は、先端ノズル部15の肉厚が例えば1.5mm、肩部16の肉厚が例えば1.0mm、ラベル上方部19の肉厚が例えば0.8mm、ラベル部18の肉厚が例えば0.5mm、ラベル下方部20の肉厚が例えば0.8mm、底部17の肉厚が例えば1.0mm、上げ底部の肉厚が例えば1.5mmとなるようにダイレクトブロー成形によって形成されている。また、先端ノスル部15には、キャップが装着されて容器10の内部に内容物を封入することができるようになっている。
【0015】
本実施形態によれば、変形吸収パネル部11は、略寄棟屋根形状の凹部13を、大棟稜線14が平行となるように胴部12の周方向に複数連接配置して、当該胴部12の周方向全周にわたってリング状に連続して設けられている。また、変形吸収パネル部11は、ラベル密着リブ21をリング状に介在させつつ、大棟稜線14を互い違いに配置した状態で上下方向に7段設けられていることにより、胴部12の略70%の領域を占めるように配設されることになる。なお、変形吸収パネル部11は、好ましくは胴部12の30〜100%の領域を占めるように設けられることにより、内圧の変化に伴う変形を一部に集中させることなく均等に分散させて効果的に吸収ことが可能になる。
【0016】
本実施形態によれば、周方向に連接配置されて各変形吸収パネル部11を構成する略寄棟屋根形状の凹部13は、大棟稜線14の両端に各二つの隅棟稜線22が各々会している、寄棟屋根を表裏逆さにした形状と略同様の形状を有するもので、図3に拡大して示すように、その正面から視た形状が、例えば5〜10mm程度の長さの大棟稜線14の両端から7〜15mm程度の長さの隅棟稜線22が各々Y字形に延設する形状となっている。また隣接する一対の隅棟稜線22間の角度αが例えば140〜160度、大棟綾線14と隅棟稜線22との間の角度βが例えば100〜110度となっており、従ってα≧βとなっている。なお、これらの各稜線14,22間の角度α,βは、これらの各稜線14,22が例えば弧状に湾曲するものである場合には、当該弧状の線の両端を結んだ直線間の角度を意味するものである。
【0017】
また、本実施形態によれば、略寄棟屋根形状の凹部13を大棟稜線14と垂直な断面A−Aで切った際における、図4に示すような両側の傾斜面23の接合角度γが例えば90〜100度となっており、各凹部13の深さDは例えば3〜5mmとなっている。なお、傾斜面23の接合角度γは、当該傾斜面23が湾曲面である場合には、断面A−Aで切った当該湾曲面の断面線の両端を結んだ直線間の角度を意味するものである。また凹部13の深さは、当該凹部13の両側の隣接する凹部13との接合部からの深さを意味するものである。
【0018】
そして、本実施形態の中空樹脂容器10によれば、内圧の変化に伴う変形を効果的に吸収して、容器10の外観形状を容易に保持することができる。すなわち、本実施形態によれば、中空樹脂容器10は、その胴部12に、略寄棟屋根形状の凹部13を複数連接配置してなる変形吸収パネル部11を備えているので、収容した内容物の化学変化等によって封止された容器10の内部に加圧や減圧を生じても、この圧力による応力を凹部13に集中させることにより、当該凹部13において局所的に変形を吸収させて、中空樹脂容器10の全体の外観形状に現れるような変形を効果的に回避することが可能になる。また、各変形吸収パネル部11に略寄棟屋根形状の凹部13が複数連接して配置されているので、圧力による応力を複数の凹部13に効率良く分散させて、さらに効果的に中空樹脂容器10の全体の変形を回避することが可能になる。
【0019】
したがって、本実施形態の中空樹脂容器10によれば、例えばラベル部18にシュリンクラベルをラベル密着リブ21に密着させて取り付けた場合において、封止された容器10の内部に加圧や減圧が生じても、これらの圧力による変形を凹部13において局所的に吸収して、ラベル密着リブ21に変形を生じさせないので、シュリンクラベルをラベル密着リブ21に密着させた状態を容易に保持して、その外観形状に影響が及ぶのを効果的に回避することが可能になる。
【0020】
なお、本発明は上記実施形態に限定されることなく種々の変更が可能である。例えば、上下方向に複数段設けられる変形吸収パネル部11は、図5に示すように、大棟稜線14の位置を互い違いにすることなく一致させて設けることもでき、また複数段設ける必要は必ずしもない。また変形吸収パネル部を周方向全周に連続させてリング状に設ける必要は必ずしもなく、凹部に代えて、略寄棟屋根形状の凸部を連接して変形吸収パネル部を構成しても良い。さらに、本発明の中空樹脂容器は、円形断面を有するものに限定されることなく、例えば三角形、四角形等の多角形断面を有するものであっても良く、多角形断面の各面に、上下又は左右に連接する略寄棟屋根形状の凸部又は凹部を設けて本発明の中空樹脂容器とすることもできる。さらにまた、本発明は、樹脂弾性率が200〜1500MPaの熱可塑性樹脂からなる中空樹脂容器に限定されることなく、例えば樹脂弾性率が3000MPa程度のPET製の中空容器等に適用することもできる。
【0021】
【実施例】
以下、実施例及び比較例により、本発明の中空樹脂容器をさらに詳細に説明するが、本発明はこれらに限定されるものではない。
【0022】
〔実施例1,2〕
図1及び図2に示す上記実施形態の中空樹脂容器10と同様の構成を有する容器を実施例1の中空樹脂容器とし、図5に示す大棟稜線を一致させた容器を実施例2の中空樹脂容器として、有限要素法による解析によって内部の加圧や減圧による加圧変形量を、各容器の胴部12におけるラベル密着リブ21の直径の変化として解析した。なお、加圧前の各容器のラベル密着リブ21の直径は74.0mmだった。また、加圧による内圧の変化を+0.01MPa、減圧による内圧の変化を−0.01MPaとした。解析結果を図7(a),(b)に示す。
【0023】
〔比較例1〕
変形吸収パネル部を全く設けることなく、胴部を滑らかな円筒形状としたこと以外は図1及び図2に示す中空樹脂容器10と同様の構成を有する容器を比較例1の中空樹脂容器として、後述する有限要素法による解析によって内部の加圧や減圧による加圧変形量を、胴部の直径の変化として解析した。なお、加圧前の胴部の直径は74.0mmだった。また、加圧による内圧の変化を+0.01MPa、減圧による内圧の変化を−0.01MPaとした。解析結果を図7(a),(b)に示す。
【0024】
図7(a),(b)に示す評価結果によれば、本発明に係る実施例1及び実施例2の中空樹脂容器は、内圧の変化に伴う変形を効果的に吸収することができ、外観形状を保持する機能に優れていることが判明する。
【0025】
【発明の効果】
本発明の中空樹脂容器によれば、特に樹脂弾性率が200〜1500MPaの樹脂を用いて形成した樹脂容器においても、内圧の変化に伴う変形を効果的に吸収して、外観形状を容易に保持することができる。
【図面の簡単な説明】
【図1】本発明の一実施形態に係る中空樹脂容器を示す斜視図である。
【図2】本発明の一実施形態に係る中空樹脂容器を示す正面図である。
【図3】略寄棟屋根形状の凹部を拡大して示す正面図である。
【図4】略寄棟屋根形状の凹部の図3のA−Aに沿った断面図である。
【図5】本発明の中空樹脂容器の他の形態を例示する斜視図である。
【図6】寄棟屋根の説明図である。
【図7】(a)及び(b)は、内部の加圧や減圧による加圧変形量の解析結果を示すチャートである。
【符号の説明】
10 中空樹脂容器
11 変形吸収パネル部
12 胴部
13 略寄棟屋根形状の凹部
14 大棟稜線
18 ラベル部
19 ラベル上方部
20 ラベル下方部
21 ラベル密着リブ
22 隅棟稜線
23 大棟稜線の両側の傾斜面
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hollow resin container formed by blow molding, and more particularly to a hollow resin container adapted to absorb deformation due to a change in internal pressure of the container.
[0002]
[Prior art]
In addition to beverages such as soft drinks, hollow resin containers such as resin bottle containers are often used as containers for storing various contents such as liquid or granular foods, cleaning agents, and medicines. . As such a hollow resin container, a container having various shapes, sizes, hardnesses, and the like is selectively used depending on its strength, moldability, physical properties of the contents to be stored, and the like.
[0003]
As a hollow resin container for containing beverages such as soft drinks, a resin container made of polyethylene terephthalate (PET) formed by biaxial stretch blow molding is generally used. Further, such a PET resin container, for example, when containing contents that require high-temperature heat sterilization, is heated or cooled after filling the high-temperature heated contents or during the heating of the filled contents. It tends to cause thermal deformation. A hollow resin container that absorbs such thermal deformation so that the appearance of the container is not impaired is known (for example, see Patent Document 1). According to the resin container described in Patent Document 1, the container Each side wall of the body portion is provided with a panel wall for absorbing a change in internal pressure. The panel wall is formed by surrounding a flat portion of the side wall with a rectangular groove and having a rectangular shape. A pair of inclined ridge lines that reach the corners of the rectangular concave groove in a V shape from both ends of a ship bottom-shaped bottom ridge line provided at the center are formed as pressure-deformable hollow walls.
[0004]
[Patent Document 1]
JP-A-8-276924 (page 2-3, FIG. 1, FIG. 2, FIG. 7)
[0005]
[Problems to be Solved by the Invention]
According to the resin container provided with the pressure deformable hollow wall described in Patent Document 1, it is a PET hollow container formed by biaxial stretch blow molding, and obtained from a resin having a resin elastic modulus of, for example, about 3000 MPa. Since the hollow container is made of a hard material, the panel wall arranged as described above can effectively absorb the deformation accompanying the change in internal pressure due to heating or cooling.
[0006]
However, for example, a resin container for containing a liquid detergent, softener, edible oil, etc., and a hollow resin container made of a soft material using, for example, polyethylene (PE) as a resin having a resin elastic modulus of about 200 to 1500 MPa In addition to changes in internal pressure due to heating or cooling, when pressure deformation due to chemical changes such as oxidation of contents occurs and pressure deformation increases, the panel wall cannot absorb the deformation sufficiently, and the panel While the deformation of the wall increases to the extent that it appears in the external shape, the external shape may not be maintained due to the deformation occurring in portions other than the panel wall.
[0007]
The present invention is a hollow resin that can effectively retain the external shape by effectively absorbing the deformation accompanying the change of the internal pressure even in a resin container formed using a resin having a resin elastic modulus of 200 to 1500 MPa. The purpose is to provide a container.
[0008]
[Means for Solving the Problems]
The present invention is a hollow resin container formed by blow molding, and is provided with a deformation absorption panel portion that absorbs deformation due to a change in the internal pressure of the container, and the deformation absorption panel portion is substantially a dormitory. The object is achieved by providing a hollow resin container configured by connecting a plurality of roof-shaped convex portions or concave portions.
[0009]
In the present application, the substantially dormitory roof shape is substantially the same as or similar to the dormitory roof 52 which is a roof in which four corner ridges 51 meet at both ends of the large ridge 50 as shown in FIG. It means shape. In addition, each ridgeline of the substantially dormitory roof shape may be a shape that is curved in an arc shape in addition to a straight line shape, and the tip of the mountain or valley by each ridgeline may be chamfered in an R shape. good.
[0010]
And according to the hollow resin container of the present invention, the angle α (see FIG. 3) between a pair of adjacent corner ridges when the convex part or concave part of the substantially laid roof shape is viewed from the front is 120 degrees or more, The angle β (see FIG. 3) between the large ridge line and the corner ridge line is 120 degrees or less, and therefore it is preferable that α ≧ β. The angle α between the pair of corner ridge lines is 120 degrees or more, and the angle β between the large ridge ridge line and the corner ridge lines is 120 degrees or less, so that deformation due to changes in internal pressure is evenly concentrated without partial concentration. It can be dispersed and effectively absorbed.
[0011]
Moreover, according to the hollow resin container of this invention, the joining angle of the inclined surface of both sides along the cross section AA (refer FIG. 3) of the direction perpendicular | vertical to the large ridgeline of the convex part of a dormitory roof shape, or a recessed part It is preferable that γ (see FIG. 4) is 90 degrees or more. The joint angle γ between the inclined surfaces on both sides of the main building ridgeline is 90 degrees or more, so that the deformation accompanying the change of internal pressure can be evenly distributed and absorbed effectively without concentrating on a part. become.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
The hollow resin container 10 according to a preferred embodiment of the present invention shown in FIGS. 1 and 2 has a bending elastic modulus (JIS K 7106) and a resin elastic modulus measured according to a bending stiffness test method of plastic by a cantilever 200. It is a bottle-like resin container having a circular cross section with a diameter of about 50 to 90 mm obtained by direct blow molding using, for example, medium density polyethylene as a thermoplastic resin of ˜1500 MPa. Moreover, the hollow resin container 10 of the present embodiment has a capacity of, for example, about 200 to 700 cc, and the contents include, for example, a bleaching agent having a property of generating gas due to environmental changes and changes over time, and a property of absorbing oxygen. The cooking oil etc. which have this are accommodated, and pressurization or pressure reduction will be produced inside the sealed container 10.
[0013]
And according to the hollow resin container 10 of this embodiment, the deformation | transformation panel part 11 which absorbs the deformation | transformation by the change of the internal pressure of the container 10 is provided in the trunk | drum 12, and the deformation | transformation absorption panel part 11 is substantially a dormitory. A plurality of roof-shaped recesses 13 are arranged in a continuous manner.
[0014]
Moreover, according to this embodiment, the hollow resin container 10 is integrally provided with the tip nosle part 15, the shoulder part 16, the trunk | drum 12, the bottom part 17, and the raising bottom part, and the trunk | drum 12 has a shrink label. It comprises a label portion 18 to be attached, a label upper portion 19 and a label lower portion 20. In addition, according to this embodiment, the hollow resin container 10 has a wall thickness of the tip nozzle portion 15 of, for example, 1.5 mm, a wall thickness of the shoulder portion 16 of, for example, 1.0 mm, and a wall thickness of the label upper portion 19 of, for example, 0. .8 mm, the thickness of the label portion 18 is, for example, 0.5 mm, the thickness of the lower portion 20 of the label is, for example, 0.8 mm, the thickness of the bottom portion 17 is, for example, 1.0 mm, and the thickness of the raised bottom portion is, for example, 1.5 mm. It is formed by direct blow molding. Further, a cap is attached to the tip nose portion 15 so that the contents can be sealed inside the container 10.
[0015]
According to the present embodiment, the deformation absorbing panel unit 11 includes a plurality of concavity roof-shaped recesses 13 connected in the circumferential direction of the trunk 12 so that the large ridge line 14 is parallel to the trunk. It is continuously provided in a ring shape over the entire circumference in 12 circumferential directions. Moreover, the deformation | transformation absorption panel part 11 is provided in seven steps in the up-down direction in the state which arrange | positioned the large ridgeline 14 alternately, interposing the label contact | adherence rib 21 in ring shape, and is substantially 70 of the trunk | drum 12. % Area. The deformation absorbing panel portion 11 is preferably provided so as to occupy an area of 30 to 100% of the body portion 12, and thus the deformation accompanying the change of the internal pressure is evenly dispersed without being concentrated in part. Can be absorbed.
[0016]
According to the present embodiment, the recess 13 having a substantially dormitory roof shape that is arranged in the circumferential direction and constitutes each deformation absorbing panel portion 11 has two corner ridge lines 22 at both ends of the large ridge line 14. It has a shape that is substantially the same as the shape of the dormitory roof upside down, and as shown in an enlarged view in FIG. 3, the shape viewed from the front is, for example, about 5 to 10 mm long. Corner building ridge lines 22 having a length of about 7 to 15 mm from both ends of the large ridge line 14 are each extended in a Y shape. In addition, the angle α between a pair of adjacent corner ridge lines 22 is, for example, 140 to 160 degrees, and the angle β between the Odate Aya line 14 and the corner ridge line 22 is, for example, 100 to 110 degrees, and therefore α ≧ β. Note that the angles α and β between the ridge lines 14 and 22 are angles between straight lines connecting both ends of the arch lines when the ridge lines 14 and 22 are curved, for example. Means.
[0017]
In addition, according to the present embodiment, the joint angle γ of the inclined surfaces 23 on both sides as shown in FIG. 4 when the substantially ridge roof-shaped concave portion 13 is cut along a section AA perpendicular to the large ridge line 14. Is 90 to 100 degrees, for example, and the depth D of each recess 13 is 3 to 5 mm, for example. Note that the joining angle γ of the inclined surface 23 means an angle between straight lines connecting both ends of the sectional line of the curved surface cut along the section AA when the inclined surface 23 is a curved surface. It is. The depth of the concave portion 13 means the depth from the joint portion with the adjacent concave portion 13 on both sides of the concave portion 13.
[0018]
And according to the hollow resin container 10 of this embodiment, the deformation | transformation accompanying the change of an internal pressure can be absorbed effectively and the external shape of the container 10 can be hold | maintained easily. That is, according to the present embodiment, the hollow resin container 10 includes the deformation absorbing panel portion 11 formed by connecting a plurality of substantially recessed roof-shaped concave portions 13 on the trunk portion 12, so that the contained contents Even if pressurization or depressurization occurs inside the container 10 sealed by a chemical change of an object, by concentrating the stress due to this pressure in the concave portion 13, the deformation is locally absorbed in the concave portion 13, It is possible to effectively avoid deformation that appears in the overall appearance of the hollow resin container 10. In addition, since the plurality of substantially ridge roof-shaped recesses 13 are connected to each of the deformation absorbing panel portions 11, stress due to pressure is efficiently dispersed in the plurality of recesses 13, and the hollow resin container is more effectively used. It becomes possible to avoid the entire deformation of ten.
[0019]
Therefore, according to the hollow resin container 10 of the present embodiment, for example, when a shrink label is attached to the label portion 18 in close contact with the label contact rib 21, pressurization or decompression is generated inside the sealed container 10. However, since the deformation due to these pressures is absorbed locally in the recess 13 and the label contact rib 21 is not deformed, the state where the shrink label is brought into close contact with the label contact rib 21 can be easily maintained. It is possible to effectively avoid affecting the appearance shape.
[0020]
The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, as shown in FIG. 5, the deformation absorbing panel portion 11 provided in a plurality of stages in the vertical direction can be provided with the positions of the main ridge lines 14 being aligned without being staggered, and it is not always necessary to provide a plurality of stages. Absent. Moreover, it is not always necessary to provide the deformation absorbing panel part continuously in the circumferential direction in a ring shape, and instead of the recesses, the deformation absorbing panel part may be configured by connecting substantially ridged roof-shaped protrusions. . Furthermore, the hollow resin container of the present invention is not limited to one having a circular cross section, and may have, for example, a polygonal cross section such as a triangle, a quadrangle, etc. The hollow resin container of the present invention can be provided by providing convex or concave portions having a substantially dormitory roof shape connected to the left and right. Furthermore, the present invention is not limited to a hollow resin container made of a thermoplastic resin having a resin elastic modulus of 200 to 1500 MPa, and can also be applied to a PET hollow container having a resin elastic modulus of about 3000 MPa, for example. .
[0021]
【Example】
Hereinafter, the hollow resin container of the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited thereto.
[0022]
Examples 1 and 2
The container having the same configuration as the hollow resin container 10 of the above embodiment shown in FIGS. 1 and 2 is used as the hollow resin container of Example 1, and the container having the same ridge line shown in FIG. As a resin container, the amount of pressure deformation due to internal pressurization or decompression was analyzed as a change in the diameter of the label adhesion rib 21 in the body 12 of each container by analysis using a finite element method. In addition, the diameter of the label adhesion rib 21 of each container before pressurization was 74.0 mm. Moreover, the change of the internal pressure by pressurization was set to +0.01 MPa, and the change of the internal pressure by pressure reduction was set to -0.01 MPa. The analysis results are shown in FIGS. 7 (a) and 7 (b).
[0023]
[Comparative Example 1]
A container having the same configuration as that of the hollow resin container 10 shown in FIGS. 1 and 2 except that the body part is formed in a smooth cylindrical shape without providing any deformation absorbing panel part, as a hollow resin container of Comparative Example 1, The amount of pressure deformation due to internal pressurization or decompression was analyzed as a change in the diameter of the body by analysis using a finite element method described later. In addition, the diameter of the trunk | drum before pressurization was 74.0 mm. Moreover, the change of the internal pressure by pressurization was set to +0.01 MPa, and the change of the internal pressure by pressure reduction was set to -0.01 MPa. The analysis results are shown in FIGS. 7 (a) and 7 (b).
[0024]
According to the evaluation results shown in FIGS. 7 (a) and (b), the hollow resin containers of Example 1 and Example 2 according to the present invention can effectively absorb deformation accompanying changes in internal pressure, It turns out that it is excellent in the function of maintaining the appearance shape.
[0025]
【The invention's effect】
According to the hollow resin container of the present invention, even in a resin container formed using a resin having a resin modulus of 200 to 1500 MPa, the external shape can be easily retained by effectively absorbing the deformation accompanying the change in internal pressure. can do.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a hollow resin container according to an embodiment of the present invention.
FIG. 2 is a front view showing a hollow resin container according to an embodiment of the present invention.
FIG. 3 is an enlarged front view showing a substantially ridge roof-shaped recess.
4 is a cross-sectional view taken along line AA of FIG.
FIG. 5 is a perspective view illustrating another embodiment of the hollow resin container of the present invention.
FIG. 6 is an explanatory diagram of a dormitory roof.
FIGS. 7A and 7B are charts showing analysis results of pressure deformation due to internal pressurization and decompression.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Hollow resin container 11 Deformation absorption panel part 12 Trunk part 13 Concave roof-shaped recessed part 14 Large ridge ridgeline 18 Label part 19 Label upper part 20 Label lower part 21 Label adhesion rib 22 Corner ridge line 23 On both sides of the large ridge line Inclined surface

Claims (5)

ブロー成形によって形成される中空樹脂容器であって、
容器の内圧の変化による変形を吸収する変形吸収パネル部をその胴部に備えており、
該変形吸収パネル部は、略寄棟屋根形状の凸部又は凹部を複数連接配置して構成されている中空樹脂容器。
A hollow resin container formed by blow molding,
The body is equipped with a deformation absorption panel that absorbs deformation due to changes in the internal pressure of the container,
The deformation absorbing panel portion is a hollow resin container configured by connecting a plurality of substantially ridged roof-shaped convex portions or concave portions.
樹脂弾性率が200〜1500MPaの樹脂を使用して形成される請求項1記載の中空樹脂容器。  The hollow resin container according to claim 1, which is formed using a resin having a resin elastic modulus of 200 to 1500 MPa. 前記寄棟屋根形状の凸部又は凹部を正面から視た場合に、隣接する一対の隅棟稜線間の角度αが120度以上、大棟綾線と隅棟稜線間の角度βが120度以下となっており、従ってα≧βとなっている請求項1又は2に記載の中空樹脂容器。  When the ridge roof-shaped convex part or concave part is viewed from the front, the angle α between the pair of adjacent corner ridge lines is 120 degrees or more, and the angle β between the large ridge Aya line and the corner ridge lines is 120 degrees or less. Therefore, the hollow resin container according to claim 1, wherein α ≧ β. 前記略寄棟屋根形状の凸部又は凹部の大棟稜線と垂直な断面に沿った両側の傾斜面の接合角度γが90度以上となっている請求項1〜3のいずれかに記載の中空樹脂容器。  The hollow according to any one of claims 1 to 3, wherein a joining angle γ of inclined surfaces on both sides along a cross section perpendicular to a large ridge line of the substantially ridge roof-shaped convex portion or concave portion is 90 degrees or more. Resin container. 前記変形吸収パネル部は、前記胴部の周方向全周に連続して設けられており、且つ前記胴部の30〜100%の領域を占めるように設けられている請求項1〜4のいずれかに記載の中空樹脂容器。The deformation absorbing panel, the provided continuously in the entire circumference of the body portion, any of the preceding claims, which and provided so as to occupy 30 to 100% of the area of the body portion The hollow resin container of crab .
JP2002292018A 2002-10-04 2002-10-04 Hollow resin container Expired - Fee Related JP4190247B2 (en)

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JP2007030893A (en) * 2005-07-22 2007-02-08 Yoshino Kogyosho Co Ltd Synthetic resin bottle
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