JP4395696B2 - Plastic container - Google Patents

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JP4395696B2
JP4395696B2 JP2001250208A JP2001250208A JP4395696B2 JP 4395696 B2 JP4395696 B2 JP 4395696B2 JP 2001250208 A JP2001250208 A JP 2001250208A JP 2001250208 A JP2001250208 A JP 2001250208A JP 4395696 B2 JP4395696 B2 JP 4395696B2
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reduced pressure
inclined surface
synthetic resin
resin container
line
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JP2003063514A (en
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正樹 三浦
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Toyo Seikan Kaisha Ltd
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Toyo Seikan Kaisha Ltd
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Description

【0001】
【発明の属する技術分野】
この発明は、合成樹脂製容器に関し、例えばポリエチレンテレフタレート(PET)のボトル等において、加熱した内容物の充填後に生じる負圧(減圧)の影響をスムーズに吸収する減圧吸収部を胴部に形成した場合でも、必要な剛性と強度を確保できるようにしたものである。
【0002】
【従来の技術】
従来からポリエチレンテレフタレート(PET)などのポリエステル樹脂等を用いて有底のプリフォームを射出成形し、得られたプリフォームを加熱昇温後、二軸延伸ブロー成形を行ってボトル状容器を製造することが行われており、得られたボトル状容器は、透明性、表面光沢、耐衝撃性、ガスバリア性等に優れ、各種飲料、食品、液体洗剤などの容器として広く使用されている。
【0003】
このようなボトル状容器では、内容物の充填にともなう圧力、あるいは加熱した内容物を充填した場合の温度低下に伴なう負圧等が加わっても外観を損ねることがないようにするため、予めボトル状容器の胴部に変形を容易とする部分を形成しておくことが行われており、特に減圧にともなう変形を吸収するための減圧吸収部を形成している。
【0004】
このような減圧吸収部としては、例えば特開昭63−203541号公報に開示された壜体パネル壁1があり、図6に示すように、直線状の底線2の上下両端に左右斜め方向の谷線3を形成し、底線2を胴部4より陥没させ、この底線2の両側の胴部4との間の左右の傾斜壁5,5部分および谷線3の間の上下の傾斜壁6,6部分の4つの傾斜壁を変形部としている。
【0005】
このような変形部により、内部からの加圧力に対しては、陥没している底線2が持ち上げられる状態で底線2に向かって斜めに形成された傾斜壁5,5,6,6が外方に押圧されて膨出変形するようになり、内部が減圧される場合には、膨出変形とは逆に底線2が内方に陥没するような形態で傾斜壁5,5,6,6を内方に変形させるようにしている。
【0006】
【発明が解決しようとする課題】
ところが、このようなパネル壁1により減圧の影響を吸収する場合、減圧吸収機能を高めるためには、できるだけ変形し易くしておく必要がある一方、ボトル状容器としては座屈強度等の強度と剛性が必要となり、できるだけ変形し難い構造とする必要があり、両立させることが難しいという問題がある。
【0007】
特に、飲料用のペットボトルなどのボトル状容器では、リサイクル法の施行にともない使用樹脂量の削減や軽量化の要求が高まっており、ボトル状容器の一層の薄肉化を図ろうとする場合には、減圧吸収部によるスムーズな変形の吸収とボトル状容器の必要な強度および剛性の確保が一層難しいという問題がある。
【0008】
この発明は上記従来技術の有する課題に鑑みてなされたもので、容器に加わる圧力や減圧力による影響をスムーズに吸収する減圧吸収部を備えた場合でも必要な強度や剛性を確保することができる合成樹脂製容器を提供しようとするものである。
【0009】
【課題を解決するための手段】
上記課題を解決するためこの発明の請求項1記載の合成樹脂製容器は、筒形状をなす胴部に、内部に生じる減圧により弾性変形を可能とする減圧吸収部が複数配列された合成樹脂製容器であって、前記減圧吸収部の少なくとも上方または下方のいずれか一方の前記胴部に補強条部を複数形成し、これら補強条部を略平行四辺形状の四辺に配置される山線条部と、当該四辺の略平行四辺形状の鋭角となる頂点を結んで配置される谷線条部とで構成するとともに、前記四辺の略平行四辺形状の山線条部の平行な2辺を前記胴部の軸線に対して傾斜して配置したことを特徴とするものであり、胴部に斜めの凹条や凸条の補強部による補強条部を複数形成することで、減圧吸収部を備えた場合でも必要な縦圧縮および横圧縮に対する強度と剛性とを確保できるようにしている。
さらに、前記補強条部を、減圧吸収部の上方または下方のいずれか、あるいは上方および下方の両方に補強条部を設けることで、減圧吸収部を備えた場合でも必要な強度および剛性を確保できる。
また、補強条部を略平行四辺形状の四辺に配置される山線条部と、当該四辺の略平行四辺形状の鋭角となる頂点を結んで配置される谷線条部とで構成するとともに、前記四辺の略平行四辺形状の山線条部の平行な2辺を前記胴部の軸線に対して傾斜して配置したことで、一層強度や剛性を高めることができるようにしている。
【0010】
また、この発明の請求項2記載の合成樹脂製容器は、請求項1記載の構成に加え、前記補強条部が形成される前記胴部を最大胴径部としたことを特徴とするものであり、輸送時や自動販売機などへの装填時に容器同士が接するために必要な胴部の最も太い部分である最大胴径部の強度や剛性を確保するようにしている。
【0011】
さらに、この発明の請求項3記載の合成樹脂製容器は、請求項1または2記載の構成に加え、前記補強条部を、互いに隣接する補強条部の先後端が重複するように形成したことを特徴とするものであり、斜めの補強条部を上下に重複させることで一層強度や剛性を高めるようにしている。
【0012】
また、この発明の請求項4記載の合成樹脂製容器は、請求項3記載の構成に加え、前記補強条部の先後端の重複範囲を、前記胴部の横断方向で30〜50%としたことを特徴とするものであり、胴部の軸線と直交する横断方向(幅方向)で30〜50%重複させることで、強度や剛性を効率的に高めるようにしている。
【0015】
【発明の実施の形態】
以下、この発明の実施の形態について図面に基づき詳細に説明する。
図1はこの発明の合成樹脂製容器の一実施の形態にかかり、(a)は正面図、(b)は補強条部の部分拡大図、(c)は減圧吸収部の中央縦断面図、(d)はA−A断面図、(e)は補強条部の谷部稜線の説明断面図である。
【0016】
この合成樹脂製容器10は、例えばポリエチレンテレフタレート(PET)を射出成形することで得られる有底の管状のプリフォームを加熱昇温した後、延伸ブロー成形することで成形されるボトルとされ、胴部11の横断面形状が円形の筒形状に形成されるほか、長方形や多角形等の筒形状に形成される。
【0017】
このような合成樹脂製容器であるボトル10の胴部11には、加熱した内容物を充填した後の温度低下による負圧を弾性変形により外観を損なうこと無く吸収させるための減圧吸収部12が周方向に複数個、図示例では周方向等間隔に6個形成してある。
【0018】
このような減圧吸収部12が胴部11に形成されたボトル10では、減圧吸収部12による強度や剛性の低下を補強するため補強条部90が形成してある。
【0019】
このボトル10の形成される補強条部90は、ボトル10の胴部11の最も径の大きい部分である最大径部91に設けられ、このボトル10では胴部11の下部が最大径部91としてあるので、減圧吸収部12の直下のこの部分に補強条部90が設けられる。
【0020】
なお、この補強条部90はボトル10の最大径部91に形成するが、ボトル10の形状によっては最大径部91が減圧吸収部12の下方でなく、上方となっている場合や上方および下方が同一径とされて最大径部91になっている場合もあり、ボトル10の形状に応じてその最大径部91に形成する。
【0021】
なお、ボトル10の横断面形状が円形以外の場合には、最大径部91としては、多角形などの最も周囲長さが長い部分を含む横断面部分とし、この部分に補強条部90を形成すれば良い。
【0022】
この補強条部90は、略平行四辺形状の山線条部92と、平行四辺形の鋭角の頂点同士を結ぶ対角線上の谷線上部93とで構成され、これをボトル10の横断方向(横断面の外形に沿う方向)、ここではボトル10が円形断面であるので横断方向が円周方向となり、胴部11の円周方向に複数、例えば12個形成してある。
【0023】
そして、各補強条部90の略平行四辺形状の四辺を構成する4本の山線条部92のうち上下の2辺92a,92bがほぼ水平の横断方向に配置され、上下の2辺92a,92bを繋ぐ左右の2辺92c,92dがボトル10の軸線に対して傾けてあり、水平線に対してその傾斜角度が15〜45度、好ましくは25〜35度としてある。この傾斜角度が15度より小さいと、十分な強度や剛性を確保するとが難しく、45度より大きいと、補強条部90の設置高さが高くなって減圧吸収部12の設置スペースが少なくなってしまう。
【0024】
通常、このボトル10では、ボトル10の胴部11の高さに対して減圧吸収部12の高さを40%以上確保するようにし、補強条部90の高さは10%以下となるように形成する。
【0025】
このように形成した補強条部90は、左右の2辺92c,92dが軸線に対して傾けてあるとともに、隣接する上下の辺92a,92bがわずかな間隔で配置してあるので、隣接する補強条部90の先後端が重複(上下に重なる)するようになり、隣接する補強条部90の先端となる上辺92aの先端と、隣接する補強条部90の後端となる下辺92bの後端とが上下方向で重複するようになっている。
【0026】
そして、この隣接する補強条部90同士の重複部分は、補強条部90の左右の2辺92c,92dの傾斜角度に応じてボトル10の横断方向で30〜50%が重なるようになっている。
【0027】
なお、この補強条部90は、平面に投影すると平行四辺形状であるが、上下の2辺92a,92bが胴部11の円周上に配置され、左右の2辺92c,92dが胴部11の円筒面に傾けて配置されるので、それぞれが曲線状とされて実際には、略平行四辺形状になっている。
【0028】
また、補強条部90の対角線上に位置する谷線条部93も、平面に投影すると直線状であるが、胴部11の円筒面に傾けて配置されるので、曲線状になっている。
【0029】
この結果、補強条部90は、略平行四辺形状の山線条部92で囲まれるとともに、1本の対角線である谷線条部93を挾んで2つの凹状の傾斜曲面94,95が形成されて構成されている。
【0030】
また、この補強条部90では、隣接する谷線条部93同士の重複部分は、例えば図1(e)に示すように、各谷線条部93が胴部11の軸線を中心とする中心角度で55度とされ、そのうち重複部分が中心角度で25度としてある。
【0031】
このような補強条部90を形成した合成樹脂製容器であるボトル10では、胴部11に減圧吸収部12が形成されていても、補強条部90の最大径部91に形成した山線条部92及び谷線条部93によって平坦面のまま、あるいは環状凹部を形成した場合に比較してボトル10の縦圧縮および横圧縮に対する剛性と強度を高めることができ、積載輸送や自動販売機への装填等によって変形することもない。
【0032】
次に、この発明の合成樹脂製容器の他の一実施の形態について図2により説明するが、既に説明した実施の形態と同一部分には、同一記号を記し、説明は省略する。
【0033】
図2は、この発明の合成樹脂製容器の一実施の形態にかかり、(a)は正面図、(b)はA−A断面図、(c)は補強条部の谷部稜線の説明断面図である。
【0034】
この合成樹脂製容器30は、例えばポリエチレンテレフタレート(PET)を射出成形することで得られる有底の管状のプリフォームを加熱昇温した後、延伸ブロー成形することで成形されるボトルとされ、胴部11の横断面形状が円形の筒形状に形成される。
【0035】
このような合成樹脂製容器であるボトル30の胴部11には、加熱した内容物を充填した後の温度低下による負圧を弾性変形により外観を損なうこと無く吸収させるための減圧吸収部31が周方向に複数個、図示例では周方向等間隔に6個形成してある。
【0036】
このような減圧吸収部31が胴部11に形成されたボトル30では、減圧吸収部31による強度や剛性の低下を補強するため補強条部90が減圧吸収部12の上方及び下方の2か所に形成してある。
【0037】
すなわち、このボトル30では、胴部11の最も径の大きい部分である最大径部91が減圧吸収部31の上下に同一径で設けられ、これら2か所の最大径部91である減圧吸収部31の直上および直下に補強条部90が設けられる。
【0038】
これら減圧吸収部31の上下方に形成される補強条部90は、既に説明したものと同一形状であり、略平行四辺形状の山線条部92と、平行四辺形の鋭角の頂点同士を結ぶ対角線上の谷線上部93とで構成され、これをボトル30の横断方向(横断面の外形に沿う方向)、ここではボトル30が円形断面であるので横断方向である胴部11の円周方向に複数、例えば12個形成してある。
【0039】
なお、他の構成も既に説明した補強条部90と同一である。
【0040】
このような補強条部90を減圧吸収部31の上下に形成した合成樹脂製容器であるボトル30では、胴部11に減圧吸収部31が形成されていても、上下の補強条部90の最大径部91の山線条部92及び谷線条部93によって平坦面のままとする場合に比較してボトル30の剛性と強度を一層高めることができ、輸送や自動販売機への装填等によって変形することもない。
【0041】
また、減圧吸収部31の上下に補強条部90を形成することで、ボトル30の剛性及び強度を高めることができるので、その分だけ減圧吸収部31の高さを高くすることもでき、一層減圧吸収効果を高めることができる。
【0042】
なお、上記実施の形態では、上下の補強条部90の左右の2辺の傾斜方向と傾斜角度を同一としたが、上下の傾斜方向を互いに逆方向としたり、傾斜角度をそれぞれ変えるようにしても良い。
【0043】
また、上記各実施の形態では、補強条部90を構成する上下・左右の山線条部92と対角位置の谷線条部93を平面に投影した状態で直線となるように形成したが、平面に投影した状態でも曲線となるようにしたり、螺旋状にするなどこれら山線条部92及び谷線条部93の形状は他の形状であっても良い。
【0044】
次に、このような補強条部90が形成される合成樹脂製容器であるボトル10,30に設けられる減圧吸収部12,31について、図面に基づいて説明する。
【0045】
まず、図1のボトル10に設けられる減圧吸収部12は、ボトル10の胴部11を内側に凹ませて形成してあり、中央縦断面形状13を中心部14が最も深く凹んだ曲線状に形成してあり、ここでは中央縦断面形状13を曲率半径の大きな円弧で構成し、中心が最も深くなっている。
【0046】
また、この減圧吸収部12は左右2つの傾斜面15,16で左右の側壁部と底部が一体として構成されるとともに、上下は側壁部と底部とが異なる傾斜面で構成され、上側壁傾斜面17、上底部傾斜面18、下側壁傾斜面19、下底部傾斜面20の4つの傾斜面で構成されており、ここでは、減圧吸収部12は合計6つの傾斜面で構成されている。
【0047】
なお、上下も側壁部と底部を一体として2つの傾斜面で構成するようにすることもでき、これにより、減圧吸収部12は最少限4つの傾斜面で構成することができる。
【0048】
そして、この減圧吸収部12では、左右の傾斜面15,16と上下底部傾斜面18,20とで底部が構成され、これらの境界となる底谷線21,22を、中心部が凸状の曲線を互いに向かい合わせた形状としてあり、ここでは、底谷線21,22を円弧とし、減圧吸収部12の中心で円弧が接するようにしてあり、円弧の両端が減圧吸収部12の四隅に位置するようにしてある。
【0049】
このような互いに向かい合わせた円弧を介して左右に位置する左右傾斜面15,16は、横断面形状がV字状に形成されて中央部が胴部11の内側に凹んでおり、V字部分の角度θが60〜175度としてある。
【0050】
このV字部分の角度θが60度より小さいと成形時に金型からの離型が困難となり、175度より大きいと平坦に近くなって内部からの圧力で膨らみ易く強度が低下することから、好ましくは150〜165度の範囲であり、ここでは、例えば155度としてある。
【0051】
また、上側壁傾斜面17および上底部傾斜面18のそれぞれの上端稜線17a,18aが上に凸状の円弧とされる一方、下側壁傾斜面19および下底部傾斜面20のそれぞれの下端稜線19a,20aが下に凸状の円弧とされ、上端と下端の稜線が互いに逆方向の円弧状に形成されており、減圧吸収部12の四隅に位置する底谷線21,22の端部とこれら稜線の端部が、図1(a)に示すように、1点で交わるようになっている。
【0052】
さらに、このように構成した減圧吸収部12の外側には、4隅が円弧とされた矩形の枠状部23が形成されてボトル10の平坦な胴部11からわずかな傾斜面を介して減圧吸収部12と連結されるようになっている。
【0053】
そして、左右の傾斜面15,16の外側稜線15a,16aがそれぞれ曲率の大きな円弧状に形成してあることから、枠状部23を除く他の減圧吸収部12の底谷線や稜線等の全ての境界線が曲線で構成されている。
【0054】
また、このような減圧吸収部12は、中央縦断面の中心線と中央横断面の中心線の交差する点を中心として点対称の形状になっている。
【0055】
このように構成した合成樹脂製容器であるボトル10では、その胴部11に減圧吸収部12が形成してあるので、加熱した内容物を充填後常温まで温度が低下することによって生じる負圧が作用すると、減圧吸収部12の縦断面形状が曲率の大きな円弧状の曲線としてあり、しかも中央部が最も深く凹ませてあるので、底部が平坦面の場合に比べスムーズに弾性変形することができ、外観を損なうこと無く、減圧の影響を吸収することができるとともに、加圧により減圧吸収部12が一旦膨出変形しても容易に元の状態に復元することができる。
【0056】
また、減圧吸収部12の底部が左右の傾斜面15,16と上下底部傾斜面1820との4つの傾斜面で構成され、しかもこれらの境界となる底谷線21,22を円弧とし、減圧吸収部12の中心で互いが接するようにしてあるので、直線の底谷線の場合に比べ、左右傾斜面15,16と上底部傾斜面18または下底部傾斜面20との3つの傾斜面の交点が動きが拘束された点とならずにスムーズに変形することができ、これによっても外観を損なうこと無く、減圧の影響を吸収することができるとともに、加圧により減圧吸収部12が一旦膨出変形しても容易に元の状態に復元することができる。
【0057】
さらに、この減圧吸収部12では、左右傾斜面15,16の横断面形状をV字状にするとともに、その角度θを155度としてあるので、成形時の金型からの離型が容易にできるとともに、平坦の場合に比べて内部からの圧力に対する強度を確保することができ、しかも内部に生じる負圧に対しては外観を損なうこと無く、減圧の影響をスムーズに吸収することができるとともに、加圧により減圧吸収部12が一旦膨出変形しても容易に元の状態に復元することができる。
【0058】
また、この減圧吸収部12では、上側壁傾斜面17および上底部傾斜面18のそれぞれの上端稜線17a,18aが上に凸状の円弧とされる一方、下側壁傾斜面19および下底部傾斜面20のそれぞれの下端稜線19a,20aが下に凸状の円弧としてあるので、上端と下端の稜線が互いに逆方向の円弧状に形成されることから直線状の境界とする場合に比べ、上側壁傾斜面17および上底部傾斜面18や下側壁傾斜面19および下底部傾斜面20の動きが円滑で、内部に生じる負圧に対しては外観を損なうこと無く、減圧の影響をスムーズに吸収することができるとともに、加圧により減圧吸収部12が一旦膨出変形しても容易に元の状態に復元することができる。
【0059】
さらに、この減圧吸収部12には、その外側に矩形の枠状部23が形成され、平坦な胴部11からわずかな傾斜面を介して減圧吸収部12と連結されているので、ボトル10の座屈強度を確保しながら、減圧吸収部12で内部に生じる負圧に対して外観を損なうこと無く、減圧の影響をスムーズに吸収することができるとともに、加圧により減圧吸収部12が一旦膨出変形しても容易に元の状態に復元することができる。
【0060】
また、枠状部23に対して左右の傾斜面15,16の外側稜線15a,16aがそれぞれ曲率の大きな円弧状に形成してあるとともに、枠状部23を除く他の減圧吸収部12の底谷線や稜線等の全ての境界線が曲線で構成してあるので、それぞれの傾斜面の境界部や境界線の交点の運動が拘束され難く、これによっても外観を損なうこと無く、減圧の影響を吸収することができるとともに、加圧により減圧吸収部12が一旦膨出変形しても容易に元の状態に復元することができる。
【0061】
さらに、減圧吸収部12がその中心(中央縦断面の中心線と中央横断面の中心線の交差する点)を中心とした点対称の形状になっているので、負圧が作用する場合の変形のし易さに差がなく、一様に変形することになり、一層外観を損なうこと無く、減圧の影響を吸収することができるとともに、加圧により減圧吸収部12が一旦膨出変形しても容易に元の状態に復元することができる。
【0062】
次に、図2のボトル30に設けられる減圧吸収部31について説明するが、既に説明した減圧吸収部12と同一部分については、同一記号を記し、説明は省略する。
【0063】
この合成樹脂製容器であるボトル30の胴部11に内側に凹ませて形成する減圧吸収部31では、左右の傾斜面32,33が左右の側壁部傾斜面34,35と左右の底部傾斜面36,37との異なる4つの傾斜面で構成してある。
【0064】
これら4つの傾斜面34〜37は、その境界線がいずれも曲線状とされ、ここでは曲率の大きな円弧で構成されている。
【0065】
そして、この減圧吸収部31では、左右の底部傾斜面36,37と上下底部傾斜面18,20とで底部が構成され、これらの境界となる底谷線38,39は、既に説明した底谷線21,22と同様に、中心部が凸状の曲線を互いに向かい合わせた形状とされ、例えば円弧として減圧吸収部31の中心で円弧が接するようにしてあり、円弧の両端が減圧吸収部31の四隅に位置するようにしてある。
【0066】
また、左の側壁部傾斜面34と左の底部傾斜面36との間、右の側壁部傾斜面35と右の底部傾斜面37との間の谷線となる境界線40,41も中心部が凸状の曲線とされて互いに向かい合う逆向きの形状とされ、例えば円弧とされて円弧の両端が減圧吸収部31の四隅に位置し、底谷線38,39と同一の点で交差するようになっており、既に説明した上側壁傾斜面17および上底部傾斜面18のそれぞれの上端稜線17a,18a、あるいは下側壁傾斜面19および下底部傾斜面20のそれぞれの下端稜線19a,20aとも減圧吸収部31の四隅の1点で交わるようになっている。
【0067】
そして、このような境界線40,41を挾んで位置する左の側壁部傾斜面34と左の底部傾斜面36、右の側壁部傾斜面35と右の底部傾斜面37は、それぞれがほぼ同一幅としてある。これにより、減圧などによる変形が局部的に起こらずほぼ均一に分散させることができるようにしている。
【0068】
また、この場合にも左右底部傾斜面36,37は横断面形状がV字状に形成されて中央部が胴部11の内側に凹んでおり、V字部分の角度θが60〜175度としてある。これら左右底部傾斜面36,37の外側に位置する左右の側壁部傾斜面34,35も角度はほぼ180度に近いがわずかなV字状に配置されて胴部11の内側に凹んでいる。
【0069】
したがって、枠状部23と減圧吸収部31との間で1つの傾斜面が形成され、さらに側壁部傾斜面34(35)と底部傾斜面36(37)で2つの傾斜面が形成され、中心部を挾んで左右両側にそれぞれ3つの傾斜面が形成されることになる。
【0070】
なお、これ以外の構成は、既に図1で説明した合成樹脂製容器であるボトル10の減圧吸収部12と同一である。
【0071】
このように構成した合成樹脂製容器であるボトル30によっても既に説明したボトル10と同一の作用効果を奏し、その胴部11に減圧吸収部31が形成してあるので、加熱した内容物を充填後常温まで温度が低下することによって生じる負圧が作用すると、減圧吸収部31のスムーズな弾性変形によって外観を損なうこと無く、減圧の影響を吸収することができるとともに、加圧により減圧吸収部12が一旦膨出変形しても容易に元の状態に復元することができる。
【0072】
さらに、この減圧吸収部31では、左の側壁部傾斜面34と左の底部傾斜面36、右の側壁部傾斜面35と右の底部傾斜面37がほぼ同一幅としてあるので、減圧などによる変形がそれぞれの傾斜面にほぼ均一に分散させることができ、一層スムーズに変形を吸収することができ、局部的な変形を防止することができる。
【0073】
また、図3に示すように、減圧吸収部31の上側壁傾斜面17及び下側壁傾斜面19を取り除いて上下の傾斜面を上底部傾斜面18及び下底部傾斜面20だけで構成するようにしても良く、このような減圧吸収部31によっても減圧吸収部31のスムーズな弾性変形によって外観を損なうこと無く、減圧の影響を吸収することができるとともに、加圧により減圧吸収部12が一旦膨出変形しても容易に元の状態に復元することができる。
【0074】
さらに、合成樹脂製容器に形成する減圧吸収部としては、図4に示す構造であっても良く、この減圧吸収部51について説明するが、既に説明した実施の形態と同一部分については、同一記号を記し、説明は省略する。
【0075】
図4は合成樹脂製容器の一実施の形態にかかり、(a)は正面図、(b)はA−A断面図、(c)はB−B断面図である。
【0076】
この胴部11に内側に凹ませて形成する減圧吸収部51は、左右の傾斜面52,53が左右の2つずつの側壁部傾斜面54,54a,55,55aと左右の底部傾斜面56,57との異なる6つの傾斜面で構成してあり、図2で説明した左右の側壁部傾斜面34,35をそれぞれ2つに分割して異なる2つの傾斜面としたものと同等である。
【0077】
そして、この減圧吸収部51でも左の側壁部傾斜面54と左の側壁部傾斜面54aとの間、右の側壁部傾斜面55と右の側壁部傾斜面55aとの間の谷線となる境界線58,59も中心部が凸状の曲線とされて互いに向かい合う逆向きの形状とされ、例えば円弧とされて円弧の両端が減圧吸収部51の四隅に位置し、図2で説明した底谷線38,39および境界線40,41と同一の点で交差するようになっており、図1で既に説明した上側壁傾斜面17および上底部傾斜面18のそれぞれの上端稜線17a,18a、あるいは下側壁傾斜面19および下底部傾斜面20のそれぞれの下端稜線19a,20aとも減圧吸収部51の四隅の1点で交わるようになっている。
【0078】
そして、この減圧吸収部51では、左の側壁部傾斜面54と左の側壁部傾斜面54aとの間、右の側壁部傾斜面55と右の側壁部傾斜面55aとの間のそれぞれの横断面形状がV字状に形成されて中央部が胴部11の内側に凹んでおり、左右底部傾斜面56,57の横断面形状もV字状に形成されて中央部が胴部11の内側に凹んでいる。
【0079】
したがって、枠状部23と減圧吸収部51との間で1つの傾斜面が形成され、さらに側壁部傾斜面54,54a(55,55a)で2つの傾斜面が、底部傾斜面56(57)で1つの傾斜面が形成され、中心部を挾んで左右両側にそれぞれ4つの傾斜面が形成されることになる。
【0080】
なお、これ以外の構成は、既に図1及び図2で説明した合成樹脂製容器であるボトル10,30と同一である。
【0081】
このように構成した合成樹脂製容器であるボトル50によっても既に説明したボトル10,30と同一の作用効果を奏し、その胴部11に減圧吸収部51が形成してあるので、加熱した内容物を充填後常温まで温度が低下することによって生じる負圧が作用すると、減圧吸収部51のスムーズな弾性変形によって外観を損なうこと無く、減圧の影響を吸収することができるとともに、加圧により減圧吸収部12が一旦膨出変形しても容易に元の状態に復元することができる。
【0082】
さらに、この減圧吸収部51では、左右の側壁部がそれぞれ2つの側壁部傾斜面54,54a,55,55aに分割して形成してあるので、減圧などによる変形がそれぞれの傾斜面にほぼ均一に分散させることができ、一層スムーズに変形を吸収することができ、局部的な変形を防止することができる。
【0083】
また、この減圧吸収部51では、左右の側壁部がそれぞれ2つの側壁部傾斜面54,54a,55,55aに分割して形成してあるので、境界線58,59が存在することになり、これによってボトル50の胴部11の強度を確保することが容易となる。
【0084】
また、合成樹脂製容器に形成する減圧吸収部としては、図5に示す構造であっても良く、この減圧吸収部71について説明するが、既に説明した実施の形態と同一部分については、同一記号を記し、説明は省略する。
【0085】
図5は合成樹脂製容器の一実施の形態にかかり、(a)は正面図、(b)は減圧吸収部のみの一部を拡大した中央縦断面図、(c)は中央横断面図である。
【0086】
このボトル70の胴部11に内側に凹ませて形成する減圧吸収部71は、左右の傾斜面72,73が左右の3つずつの側壁部傾斜面74,74a,74b,75,75a,75bと左右中央の2つの底部傾斜面76,77との異なる8つの傾斜面で構成してあり、図2で説明した左右の側壁部傾斜面34,35をそれぞれ3つに分割して異なる3つの傾斜面としたものと傾斜面の数で同等であるが、この減圧吸収部71では、各傾斜面の間の境界線の端部を減圧吸収部71の四隅の1点に集中させずに分散させて位置させてある。
【0087】
また、この減圧吸収部71では、左右中央の2つの底部傾斜面76,77の間に上下の底部傾斜面78,79が配置されており、全体で10個の傾斜面で構成してある。
【0088】
そして、この減圧吸収部71では、左右中央の2つの底部傾斜面76,77の間の中心部で接するように互いに逆向きの円弧状とされた底谷線80,81の端部が上底部傾斜面78の上端稜線78aの両端部に位置するとともに、下底部傾斜面79の下端稜線79aの両端部に位置している。また、左の底部傾斜面76とその外側の左の側壁部傾斜面74との間の境界線82が底谷線80の外側で減圧吸収部71の上側稜線71aと下側稜線71b上に位置し、これと対称に右の底部傾斜面77とその外側の右の側壁部傾斜面75との間の境界線83が底谷線81の外側で減圧吸収部71の上側稜線71aと下側稜線71b上に位置している。
【0089】
さらに、左の側壁部傾斜面74とその外側の左の側壁部傾斜面74aとの間の境界線84および左の側壁部傾斜面74aとその外側の左の側壁部傾斜面74bとの間の境界線84aは減圧吸収部71の左側稜線71c上の両端部に位置し、これと対称に右の側壁部傾斜面75とその外側の右の側壁部傾斜面75aとの間の境界線85および右の側壁部傾斜面75aとその外側の右の側壁部傾斜面75bとの間の境界線85aは減圧吸収部71の右側稜線71d上の両端部に位置している。なお、これら境界線はいずれも中心部が凸状の円弧等の曲線で構成されている。
【0090】
また、この減圧吸収部71では、既に説明した減圧吸収部12,31,51と異なり、上下の傾斜面が上下の底部傾斜面78,79だけの1つの傾斜面で構成されることから、補強のため、図5(b)に拡大して示すように、上下端縁部に小さな傾斜面で構成した補強斜面86,87が形成してある。
【0091】
なお、これ以外の構成は、既に図1〜図3で説明した合成樹脂製容器であるボトル10,30,50と同一である。
【0092】
このように構成した合成樹脂製容器であるボトル70によっても既に説明したボトル10,30,50と同一の作用効果を奏し、その胴部11に減圧吸収部71が形成してあるので、加熱した内容物を充填後常温まで温度が低下することによって生じる負圧が作用すると、減圧吸収部71のスムーズな弾性変形によって外観を損なうこと無く、減圧の影響を吸収することができるとともに、加圧により減圧吸収部12が一旦膨出変形しても容易に元の状態に復元することができる。
【0093】
さらに、この減圧吸収部71では、左右の側壁面がそれぞれ4つの傾斜面で構成してあり、例えば左側では、側壁部傾斜面74,74a,74bと底部傾斜面76を備えるとともに、境界線を1点に集中させずに分散してあるので、減圧などによりそれぞれの傾斜面が拘束されずにスムーズに動き易く、しかも変形がそれぞれの傾斜面にほぼ均一に分散されるので、一層スムーズに変形を吸収することができ、局部的な変形を防止することができる。
【0094】
なお、上記各実施の形態では、500mlの略円形断面のペットボトルに適用する場合を例に説明したが、これに限らず、他の容積の場合や他の断面形状のボトル等の合成樹脂製容器に同様に適用することができる。
【0095】
【発明の効果】
以上、一実施の形態とともに具体的に説明したようにこの発明の請求項1記載の合成樹脂製容器によれば、筒形状をなす胴部に、内部に生じる減圧により弾性変形を可能とする減圧吸収部が複数配列された合成樹脂製容器であって、前記減圧吸収部の少なくとも上方または下方のいずれか一方の前記胴部に補強条部を複数形成し、これら補強条部を略平行四辺形状の四辺に配置される山線条部と、当該四辺の略平行四辺形状の鋭角となる頂点を結んで配置される谷線条部とで構成するとともに、前記四辺の略平行四辺形状の山線条部の平行な2辺を前記胴部の軸線に対して傾斜して配置したので、胴部に斜めの凹条や凸条の補強部による補強条部を複数形成することで、減圧吸収部を備えた場合でも必要な縦圧縮および横圧縮に対する強度と剛性を確保することができる。
さらに、前記補強条部を、前記減圧吸収部の少なくとも上方または下方のいずれか一方の前記胴部に形成したので、減圧吸収部の上方または下方のいずれか、あるいは上方および下方の両方に補強条部を設けることで減圧吸収部を備えた場合でも必要な強度および剛性を確保できる。
また、補強条部を略平行四辺形状の四辺に配置される山線条部と、当該四辺の略平行四辺形状の鋭角となる頂点を結んで配置される谷線条部とで構成するとともに、前記四辺の略平行四辺形状の山線条部の平行な2辺を前記胴部の軸線に対して傾斜して配置したので、一層強度や剛性を高めることができる。
【0096】
また、この発明の請求項2記載の合成樹脂製容器によれば、前記補強条部が形成される前記胴部を最大胴径部としたので、輸送時や自動販売機などへの装填時に容器同士が接するために必要な胴部の最も太い部分である最大胴径部の強度や剛性を確保することができる。
【0097】
さらに、この発明の請求項3記載の合成樹脂製容器によれば、前記補強条部を、互いに隣接する補強条部の先後端が重複するように形成したので、斜めの補強条部を上下に重複させることで一層強度や剛性を高めることができる。
【0098】
また、この発明の請求項4記載の合成樹脂製容器によれば、前記補強条部の先後端の重複範囲を、前記胴部の横断方向で30〜50%としたので、胴部の軸線と直交する横断方向(幅方向)で30〜50%重複させることで、強度や剛性を効率的に高めることができる。
【図面の簡単な説明】
【図1】この発明の合成樹脂製容器の一実施の形態にかかり、(a)は正面図、(b)は補強条部の部分拡大図、(c)は減圧吸収部の中央縦断面図、(d)はA−A断面図、(e)は補強条部の谷部稜線の説明断面図である。
【図2】この発明の合成樹脂製容器の一実施の形態にかかり、(a)は正面図、(b)はA−A断面図、(c)は補強条部の谷部稜線の説明断面図である。
【図3】この発明の合成樹脂製容器のさらに他の一実施の形態にかかる正面図である。
【図4】この発明の合成樹脂製容器の他の減圧吸収部にかかり、(a)は正面図、 (b)はA−A断面図、(c)はB−B断面図である。
【図5】この発明の合成樹脂製容器のさらに他の減圧吸収部にかかり、(a)は正面図、(b)は減圧吸収部のみの一部を拡大した中央縦断面図、(c)は中央横断面図である。
【図6】従来の減圧吸収部を備えたペットボトルの左半分を切断した断面図である。
【符号の説明】
10,30,50,70 ボトル(合成樹脂製容器)
11 胴部
12,31,51,71 減圧吸収部
90 補強条部
91 最大径部
92 山線条部
92a,92b 上下の山線条部
92c,92d 左右の山線条部
93 谷線条部(対角線)
94,95 傾斜曲面
13 中央縦断面形状
14 中心部
15,32,52,72 左の傾斜面
15a 外側稜線
16,33,53,73 右の傾斜面
16a 外側稜線
17 上側壁部傾斜面
17a 上端稜線
18,78 上底部傾斜面
18a 上端稜線
19 下側壁部傾斜面
19a 下端稜線
20,79 下底部傾斜面
20a 下端稜線
21,38,80 左の底谷線
22,39,81 右の底谷線
23 枠状部
34,54,54a,74,74a,74b 左の側壁部傾斜面
35,55,55a,75,75a,75b 右の側壁部傾斜面
36,56,76,82,84,84a 左の底部傾斜面
37,57,77,83,85,85a 右の底部傾斜面
40,58 左の境界線
41,59 右の境界線
86 上の補強斜面
87 下の補強斜面
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a synthetic resin container, for example, a polyethylene terephthalate (PET) bottle or the like, in which a reduced-pressure absorption portion that smoothly absorbs the influence of negative pressure (decompression) generated after filling with heated contents is formed in the body portion. Even in this case, necessary rigidity and strength can be secured.
[0002]
[Prior art]
Conventionally, a bottomed preform is injection molded using a polyester resin such as polyethylene terephthalate (PET), and the resulting preform is heated and heated, and then biaxially stretched blow molded to produce a bottle-shaped container. The obtained bottle-shaped containers are excellent in transparency, surface gloss, impact resistance, gas barrier properties and the like, and are widely used as containers for various beverages, foods, liquid detergents and the like.
[0003]
In such a bottle-shaped container, in order not to impair the appearance even if the pressure accompanying the filling of the contents or the negative pressure accompanying the temperature drop when filling the heated contents is applied, A portion that facilitates deformation is formed in advance in the body of the bottle-shaped container, and in particular, a reduced pressure absorbing portion for absorbing deformation due to reduced pressure is formed.
[0004]
As such a reduced pressure absorption part, there is a housing panel wall 1 disclosed in, for example, Japanese Patent Laid-Open No. 63-203541, and as shown in FIG. The valley line 3 is formed, the bottom line 2 is depressed from the body part 4, the left and right inclined walls 5 and 5 between the body part 4 on both sides of the bottom line 2 and the upper and lower inclined walls 6 between the valley lines 3. The four inclined walls of 6 parts are used as the deformed portions.
[0005]
By such a deforming portion, the inclined walls 5, 5, 6, 6 formed obliquely toward the bottom line 2 in the state where the depressed bottom line 2 is lifted against the pressure from the inside are outward. When the inside is depressurized and the inside is depressurized, the inclined walls 5, 5, 6 and 6 are formed in such a manner that the bottom line 2 sinks inward, contrary to the bulging deformation. It is designed to deform inward.
[0006]
[Problems to be solved by the invention]
However, when absorbing the influence of reduced pressure by such a panel wall 1, it is necessary to make it easy to deform as much as possible in order to enhance the reduced pressure absorption function. There is a problem that rigidity is required, the structure needs to be as difficult to deform as possible, and it is difficult to achieve both.
[0007]
Especially for bottle-shaped containers such as plastic bottles for beverages, there are increasing demands for reducing the amount of resin used and weight reduction with the enforcement of the recycling law. Further, there is a problem that it is more difficult to absorb the smooth deformation by the reduced pressure absorption part and to secure the necessary strength and rigidity of the bottle-shaped container.
[0008]
The present invention has been made in view of the above-described problems of the prior art, and even when a reduced pressure absorbing portion that smoothly absorbs the effect of pressure and reduced pressure applied to a container is provided, necessary strength and rigidity can be ensured. A synthetic resin container is to be provided.
[0009]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the synthetic resin container according to claim 1 of the present invention is made of a synthetic resin in which a plurality of reduced-pressure absorbing portions that can be elastically deformed by reduced pressure generated inside are formed in a cylindrical body portion. A container, wherein a plurality of reinforcing strips are formed on at least one of the upper and lower body portions of the vacuum absorbing portion, and the reinforcing strips are formed in a substantially parallelogram shape. Placed on the four sides of Mountain line strip, The four sides Connects vertices that form an acute angle of a substantially parallelogram shape. Arranged Consists of the valley line section In addition, the two parallel sides of the substantially parallelogram-shaped ridges of the four sides are inclined with respect to the axis of the trunk portion. The strength against longitudinal and lateral compression required even when a vacuum absorbing part is provided by forming a plurality of reinforcing strips with slanted concave strips and convex strips on the trunk. And ensure rigidity.
Furthermore, by providing the reinforcing strips above or below the decompression absorbing portion, or both above and below, the necessary strength and rigidity can be ensured even when the decompression absorbing portion is provided. .
In addition, the reinforcing strip portion is composed of a mountain line portion that is arranged on four sides of a substantially parallelogram shape, and a trough line portion that is arranged by connecting apexes that are acute angles of the substantially parallelogram shape of the four sides, Two parallel sides of the substantially parallelogram-shaped ridges of the four sides are inclined with respect to the axis of the trunk portion. Thus, the strength and rigidity can be further increased.
[0010]
Moreover, the synthetic resin container according to claim 2 of the present invention includes the reinforcing strip portion in addition to the configuration according to claim 1. The body part formed with the maximum body diameter part The strength and rigidity of the largest body diameter part, which is the thickest part of the body part necessary for the containers to come into contact with each other during transportation or loading into a vending machine, etc. should be ensured. Yes.
[0011]
Further, in the synthetic resin container according to claim 3 of the present invention, in addition to the configuration according to claim 1 or 2, the reinforcing strip is formed so that the front and rear ends of the adjacent reinforcing strips overlap each other. The strength and rigidity are further improved by overlapping diagonal reinforcing strips vertically.
[0012]
Further, in the synthetic resin container according to claim 4 of the present invention, in addition to the configuration according to claim 3, the overlapping range of the front and rear ends of the reinforcing strip is set to 30 to 50% in the transverse direction of the trunk portion. The strength and the rigidity are efficiently increased by overlapping 30 to 50% in the transverse direction (width direction) orthogonal to the axis of the trunk portion.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows an embodiment of a synthetic resin container according to the present invention, (a) is a front view, (b) is a partially enlarged view of a reinforcing strip, (c) is a central longitudinal cross-sectional view of a reduced pressure absorbing portion, (D) is AA sectional drawing, (e) is explanatory sectional drawing of the trough ridgeline of a reinforcing strip.
[0016]
The synthetic resin container 10 is a bottle formed by heating and heating a bottomed tubular preform obtained by injection molding, for example, polyethylene terephthalate (PET), and then stretch blow molding, The cross-sectional shape of the portion 11 is formed in a circular cylindrical shape, or in a cylindrical shape such as a rectangle or a polygon.
[0017]
In the body portion 11 of the bottle 10 which is such a synthetic resin container, there is a reduced pressure absorption portion 12 for absorbing the negative pressure due to the temperature drop after filling the heated contents without damaging the appearance by elastic deformation. A plurality are formed in the circumferential direction, and in the illustrated example, six are formed at equal intervals in the circumferential direction.
[0018]
In the bottle 10 in which such a reduced pressure absorbing portion 12 is formed on the body portion 11, a reinforcing strip portion 90 is formed to reinforce a decrease in strength and rigidity due to the reduced pressure absorbing portion 12.
[0019]
The reinforcing strip 90 formed in the bottle 10 is provided in the maximum diameter portion 91 which is the largest diameter portion of the body portion 11 of the bottle 10, and the lower portion of the body portion 11 is the maximum diameter portion 91 in the bottle 10. Therefore, the reinforcing strip 90 is provided in this portion immediately below the vacuum absorbing portion 12.
[0020]
The reinforcing strip 90 is formed on the maximum diameter portion 91 of the bottle 10, but depending on the shape of the bottle 10, the maximum diameter portion 91 is not below the decompression absorbing portion 12 but above, or above and below. May have the same diameter and become the maximum diameter portion 91, and the maximum diameter portion 91 is formed according to the shape of the bottle 10.
[0021]
When the cross-sectional shape of the bottle 10 is other than a circle, the maximum diameter portion 91 is a cross-sectional portion including a portion having the longest peripheral length such as a polygon, and a reinforcing strip 90 is formed in this portion. Just do it.
[0022]
The reinforcing strip 90 is composed of a substantially parallelogram-shaped mountain line strip 92 and a trough upper portion 93 on a diagonal line connecting the acute vertices of the parallelogram, and this is formed in a transverse direction (crossing of the bottle 10). (The direction along the outer shape of the surface), here, since the bottle 10 has a circular cross section, the transverse direction is the circumferential direction, and a plurality of, for example, 12 are formed in the circumferential direction of the body portion 11.
[0023]
Then, the upper and lower two sides 92a and 92b of the four ridges 92 constituting the substantially parallelogram-shaped four sides of each reinforcing strip 90 are arranged in a substantially horizontal transverse direction, and the upper and lower two sides 92a, The left and right sides 92c and 92d connecting 92b are inclined with respect to the axis of the bottle 10, and the inclination angle is 15 to 45 degrees, preferably 25 to 35 degrees with respect to the horizontal line. If the inclination angle is less than 15 degrees, it is difficult to ensure sufficient strength and rigidity. If the inclination angle is greater than 45 degrees, the installation height of the reinforcing strip 90 is increased and the installation space for the reduced pressure absorbing section 12 is reduced. End up.
[0024]
Usually, in this bottle 10, the height of the decompression absorbing portion 12 is secured to 40% or more with respect to the height of the body portion 11 of the bottle 10, and the height of the reinforcing strip 90 is 10% or less. Form.
[0025]
In the reinforcing strip 90 formed in this way, the two left and right sides 92c and 92d are inclined with respect to the axis, and the adjacent upper and lower sides 92a and 92b are arranged at a slight interval. The front and rear ends of the strips 90 overlap (superimpose vertically), and the leading end of the upper side 92a serving as the leading end of the adjacent reinforcing strip 90 and the rear end of the lower side 92b serving as the trailing end of the adjacent reinforcing strip 90 And overlap in the vertical direction.
[0026]
The overlapping portions of the adjacent reinforcing strips 90 overlap 30 to 50% in the transverse direction of the bottle 10 according to the inclination angles of the left and right sides 92c and 92d of the reinforcing strip 90. .
[0027]
The reinforcing strip 90 has a parallelogram shape when projected onto a plane, but the upper and lower two sides 92a and 92b are arranged on the circumference of the body 11 and the left and right sides 92c and 92d are the body 11. Are inclined with respect to the cylindrical surface of each other, so that each of them is curved and actually has a substantially parallelogram shape.
[0028]
Further, the trough line section 93 positioned on the diagonal line of the reinforcing strip 90 is also linear when projected onto a plane, but is curved because it is arranged to be inclined to the cylindrical surface of the body section 11.
[0029]
As a result, the reinforcing strip 90 is surrounded by the substantially parallelogram-shaped mountain line section 92, and two concave inclined curved surfaces 94, 95 are formed with the valley line section 93 that is one diagonal line interposed therebetween. Configured.
[0030]
Moreover, in this reinforcement | strengthening stripe part 90, as shown in FIG.1 (e), for example, as shown in FIG.1 (e), the overlapping part of the adjacent valley line stripe parts 93 is the center centering on the axis line of the trunk | drum 11. The angle is 55 degrees, and the overlapping portion is 25 degrees in the central angle.
[0031]
In the bottle 10 which is a synthetic resin container in which such a reinforcing strip portion 90 is formed, even if the decompression absorbing portion 12 is formed in the trunk portion 11, the mountain line strip formed in the maximum diameter portion 91 of the reinforcing strip portion 90. The rigidity and strength of the bottle 10 with respect to longitudinal compression and lateral compression can be increased as compared with the case where the portion 92 and the valley line strip portion 93 remain flat or have an annular recess, and can be loaded and transported to a vending machine. It will not be deformed by loading.
[0032]
Next, another embodiment of the synthetic resin container according to the present invention will be described with reference to FIG. 2, but the same parts as those of the embodiment already described are denoted by the same reference numerals, and the description thereof will be omitted.
[0033]
2A and 2B show an embodiment of the synthetic resin container according to the present invention, wherein FIG. 2A is a front view, FIG. 2B is an AA cross-sectional view, and FIG. 2C is an explanatory cross-section of a valley ridge line of a reinforcing strip. FIG.
[0034]
The synthetic resin container 30 is a bottle formed by heating and heating a bottomed tubular preform obtained by, for example, polyethylene terephthalate (PET) injection molding, and then stretch blow molding. The cross-sectional shape of the part 11 is formed in a circular cylindrical shape.
[0035]
The body portion 11 of the bottle 30 which is such a synthetic resin container has a reduced pressure absorbing portion 31 for absorbing the negative pressure due to the temperature drop after filling the heated contents without damaging the appearance by elastic deformation. A plurality are formed in the circumferential direction, and in the illustrated example, six are formed at equal intervals in the circumferential direction.
[0036]
In the bottle 30 in which the reduced pressure absorbing portion 31 is formed on the body portion 11, the reinforcing strip 90 is provided at two locations above and below the reduced pressure absorbing portion 12 in order to reinforce the strength and rigidity of the reduced pressure absorbing portion 31. Is formed.
[0037]
That is, in this bottle 30, the maximum diameter portion 91, which is the largest diameter portion of the body portion 11, is provided with the same diameter above and below the reduced pressure absorption portion 31, and the reduced pressure absorption portions that are the two maximum diameter portions 91. Reinforcing strips 90 are provided directly above and directly below 31.
[0038]
The reinforcing strips 90 formed above and below the decompression absorbing portion 31 have the same shape as described above, and connect the parallel parallel mountain-shaped strips 92 and the acute vertices of the parallelogram. It is comprised by the trough line upper part 93 on a diagonal line, and this is the transverse direction (direction which follows the external shape of a cross section) of the bottle 30, and since the bottle 30 is a circular cross section here, the circumferential direction of the trunk | drum 11 which is a cross direction For example, 12 pieces are formed.
[0039]
The other configurations are the same as the reinforcing strip 90 described above.
[0040]
In the bottle 30 which is a synthetic resin container in which the reinforcing strips 90 are formed above and below the vacuum absorber 31, even if the vacuum absorber 31 is formed on the body portion 11, The rigidity and strength of the bottle 30 can be further increased compared to the case where the flat surface is maintained by the mountain line portion 92 and the valley line portion 93 of the diameter portion 91, and transportation, loading into a vending machine, etc. There is no deformation.
[0041]
Further, by forming the reinforcing strips 90 on the top and bottom of the reduced pressure absorbing part 31, the rigidity and strength of the bottle 30 can be increased, so that the height of the reduced pressure absorbing part 31 can be increased by that much. The reduced pressure absorption effect can be enhanced.
[0042]
In the above-described embodiment, the inclination direction and the inclination angle of the left and right sides of the upper and lower reinforcing strips 90 are the same, but the upper and lower inclination directions are opposite to each other or the inclination angle is changed. Also good.
[0043]
Further, in each of the above-described embodiments, the upper and lower / left and right mountain line sections 92 and the diagonal valley line sections 93 that form the reinforcement strip 90 are formed so as to form a straight line in a projected state on a plane. Further, the shape of the mountain line portion 92 and the valley line portion 93 may be other shapes such as a curved line even when projected onto a plane or a spiral shape.
[0044]
Next, the reduced pressure absorption parts 12 and 31 provided in the bottles 10 and 30 which are synthetic resin containers in which such reinforcing strips 90 are formed will be described with reference to the drawings.
[0045]
First, the vacuum absorption part 12 provided in the bottle 10 of FIG. 1 is formed by indenting the body part 11 of the bottle 10 inward, and the central longitudinal cross-sectional shape 13 has a curved shape with the central part 14 recessed most deeply. Here, the central longitudinal sectional shape 13 is formed by an arc having a large curvature radius, and the center is deepest.
[0046]
The decompression absorbing portion 12 is composed of two left and right inclined surfaces 15 and 16 and the right and left side wall portions and the bottom portion are integrally formed, and the upper and lower sides are constituted by inclined surfaces having different side wall portions and bottom portions. 17, the upper bottom inclined surface 18, the lower side wall inclined surface 19, and the lower bottom inclined surface 20 are configured by four inclined surfaces. Here, the decompression absorbing portion 12 is configured by a total of six inclined surfaces.
[0047]
In addition, the upper and lower sides can also be configured by two inclined surfaces with the side wall portion and the bottom portion integrated, whereby the reduced pressure absorbing portion 12 can be configured by a minimum of four inclined surfaces.
[0048]
And in this decompression absorption part 12, a bottom part is constituted by left and right inclined surfaces 15 and 16 and upper and lower bottom inclined surfaces 18 and 20, and bottom valley lines 21 and 22 serving as a boundary between them are convex at the center. The curves are shaped to face each other. Here, the bottom valley lines 21 and 22 are circular arcs, and the circular arcs are in contact with each other at the center of the vacuum absorbing portion 12, and both ends of the circular arcs are positioned at the four corners of the vacuum absorbing portion 12. I have to do it.
[0049]
The left and right inclined surfaces 15 and 16 positioned on the left and right via the arcs facing each other are formed in a V-shaped cross-sectional shape and a central portion is recessed inside the trunk portion 11, and the V-shaped portion. Is set to 60 to 175 degrees.
[0050]
If the angle θ of the V-shaped portion is smaller than 60 degrees, it is difficult to release from the mold during molding, and if it is larger than 175 degrees, it becomes nearly flat and swells easily due to pressure from the inside. Is in the range of 150 to 165 degrees, for example, 155 degrees.
[0051]
Further, the upper end ridge lines 17a and 18a of the upper side wall inclined surface 17 and the upper bottom inclined surface 18 are formed as convex arcs, while the lower end ridge lines 19a of the lower side wall inclined surface 19 and the lower bottom inclined surface 20 are provided. , 20a is formed as a downwardly convex arc, and the ridge lines at the upper end and the lower end are formed in arcs opposite to each other, and the ends of the bottom valley lines 21, 22 located at the four corners of the decompression absorbing portion 12 and these As shown in FIG. 1A, the ends of the ridge lines intersect at one point.
[0052]
Further, a rectangular frame-like portion 23 having four arcs is formed outside the reduced-pressure absorbing portion 12 configured as described above, and the pressure is reduced from the flat body portion 11 of the bottle 10 through a slight inclined surface. It is connected with the absorption part 12.
[0053]
And since the outer ridge lines 15a and 16a of the left and right inclined surfaces 15 and 16 are each formed in an arc shape having a large curvature, the bottom valley line and the ridge line of the other decompression absorbing portions 12 other than the frame-shaped portion 23 are provided. All boundary lines are composed of curves.
[0054]
Further, such a reduced pressure absorbing portion 12 has a point-symmetric shape around a point where the center line of the central longitudinal section and the center line of the central transverse section intersect.
[0055]
In the bottle 10 which is a synthetic resin container configured as described above, since the reduced pressure absorbing portion 12 is formed in the body portion 11, the negative pressure generated when the temperature is lowered to room temperature after filling the heated contents. When it acts, the longitudinal cross-sectional shape of the reduced pressure absorbing portion 12 is an arc-shaped curve with a large curvature, and the central portion is recessed most deeply, so that it can be elastically deformed more smoothly than the case where the bottom portion is a flat surface. The influence of the reduced pressure can be absorbed without impairing the appearance, and the original state can be easily restored even if the reduced pressure absorbing portion 12 is once bulged and deformed by the pressurization.
[0056]
Further, the bottom of the reduced pressure absorbing portion 12 is composed of four inclined surfaces, that is, left and right inclined surfaces 15 and 16 and an upper and lower bottom inclined surface 1820, and the bottom valley lines 21 and 22 serving as the boundary between these are arcs, and the reduced pressure absorption Since they are in contact with each other at the center of the portion 12, the intersection of the three inclined surfaces of the left and right inclined surfaces 15, 16 and the upper bottom inclined surface 18 or the lower bottom inclined surface 20 as compared with the case of the straight bottom valley line. Can be smoothly deformed without being restricted in movement, and this can absorb the influence of the decompression without impairing the appearance, and the decompression absorbing portion 12 is once expanded by the pressurization. Even if it is deformed, it can be easily restored to its original state.
[0057]
Further, in the reduced pressure absorbing portion 12, the horizontal cross-sectional shape of the left and right inclined surfaces 15 and 16 is V-shaped and the angle θ is 155 degrees, so that the mold can be easily released from the mold during molding. In addition, the strength against the pressure from the inside can be ensured compared to the case of flatness, and the negative pressure generated inside can be absorbed smoothly without damaging the external appearance, Even if the reduced pressure absorbing portion 12 is once bulged and deformed by pressurization, it can be easily restored to the original state.
[0058]
Further, in the reduced pressure absorbing portion 12, the upper end ridge lines 17a and 18a of the upper side wall inclined surface 17 and the upper bottom side inclined surface 18 are formed as upward convex arcs, while the lower side wall inclined surface 19 and the lower bottom side inclined surface are provided. Since each of the lower edge ridge lines 19a and 20a of the 20 is a downwardly convex arc, the upper wall and the lower edge are formed in arcs opposite to each other. The inclined surface 17, the upper bottom inclined surface 18, the lower side wall inclined surface 19, and the lower bottom inclined surface 20 move smoothly, and the negative pressure generated inside can be smoothly absorbed without deteriorating the appearance. In addition, even if the reduced pressure absorbing portion 12 is once bulged and deformed by pressurization, it can be easily restored to the original state.
[0059]
Further, the decompression absorbing portion 12 is formed with a rectangular frame-like portion 23 on the outside thereof, and is connected to the decompression absorbing portion 12 through a slight inclined surface from the flat trunk portion 11. While ensuring the buckling strength, it is possible to smoothly absorb the influence of the reduced pressure without damaging the external appearance of the negative pressure generated inside the reduced pressure absorbing section 12, and the reduced pressure absorbing section 12 is temporarily expanded by the pressurization. Even if it is deformed, it can be easily restored to its original state.
[0060]
Further, the outer edge lines 15a and 16a of the left and right inclined surfaces 15 and 16 with respect to the frame-shaped portion 23 are formed in arcs having a large curvature, respectively, and the bottoms of the other decompression absorbing portions 12 other than the frame-shaped portion 23 Since all the boundary lines such as valleys and ridge lines are composed of curves, the movement of the boundary part of each inclined surface and the intersection of the boundary lines is difficult to be restrained. Can be absorbed, and even if the reduced pressure absorbing portion 12 bulges and deforms once by pressurization, it can be easily restored to the original state.
[0061]
Furthermore, since the decompression absorbing portion 12 has a point-symmetric shape centered on the center thereof (a point where the center line of the central longitudinal section and the center line of the central transverse section intersect), deformation when negative pressure acts There is no difference in ease of operation, it will be uniformly deformed, the effect of reduced pressure can be absorbed without further deteriorating the appearance, and the reduced pressure absorbing portion 12 once bulges and deforms due to pressurization. Can be easily restored to its original state.
[0062]
Next, the vacuum absorber 31 provided in the bottle 30 of FIG. 2 will be described, but the same parts as those of the vacuum absorber 12 already described will be denoted by the same reference numerals and description thereof will be omitted.
[0063]
In the reduced pressure absorbing portion 31 formed by indenting in the body portion 11 of the bottle 30 which is a synthetic resin container, the left and right inclined surfaces 32 and 33 have left and right side wall inclined surfaces 34 and 35 and left and right bottom inclined surfaces. 36 and 37, and four different inclined surfaces.
[0064]
The boundary lines of these four inclined surfaces 34 to 37 are all curved, and here, they are constituted by arcs having a large curvature.
[0065]
And in this decompression absorption part 31, a bottom part is constituted by right and left bottom slopes 36 and 37 and top and bottom bottom slopes 18 and 20, and bottom valley lines 38 and 39 which become these boundaries are the bottom valley already explained. Similarly to the lines 21 and 22, the central part has a shape in which convex curves face each other. For example, the arc is in contact with the center of the decompression absorbing part 31 as an arc, and both ends of the arc are the decompression absorbing part 31. It is located at the four corners.
[0066]
In addition, boundary lines 40 and 41 that are valley lines between the left side wall inclined surface 34 and the left bottom inclined surface 36 and between the right side wall inclined surface 35 and the right bottom inclined surface 37 are also central portions. Are convex curves and have opposite shapes facing each other. For example, they are arcs so that both ends of the arc are located at the four corners of the reduced pressure absorbing portion 31 and intersect with the bottom valley lines 38 and 39 at the same point. Each of the upper end ridgelines 17a and 18a of the upper side wall inclined surface 17 and the upper bottom side inclined surface 18 or the lower end ridgelines 19a and 20a of the lower side wall inclined surface 19 and the lower bottom side inclined surface 20 described above is decompressed. The absorber 31 intersects at one of the four corners.
[0067]
Further, the left side wall inclined surface 34 and the left bottom inclined surface 36, and the right side wall inclined surface 35 and the right bottom inclined surface 37, which are located on both sides of the boundary lines 40 and 41, are substantially the same. As width. As a result, deformation due to reduced pressure or the like does not occur locally and can be dispersed almost uniformly.
[0068]
Also in this case, the left and right bottom inclined surfaces 36 and 37 are formed in a V-shaped cross section, the center is recessed inside the body 11, and the angle θ of the V-shaped portion is 60 to 175 degrees. is there. The left and right side wall inclined surfaces 34, 35 positioned outside the left and right bottom inclined surfaces 36, 37 are also arranged in a slight V-shape and recessed inside the trunk 11, although the angle is close to approximately 180 degrees.
[0069]
Therefore, one inclined surface is formed between the frame-shaped portion 23 and the reduced pressure absorbing portion 31, and two inclined surfaces are formed by the side wall inclined surface 34 (35) and the bottom inclined surface 36 (37), and the center Three inclined surfaces are formed on both the left and right sides of the part.
[0070]
In addition, the structure other than this is the same as the decompression absorption part 12 of the bottle 10 which is a synthetic resin container already demonstrated in FIG.
[0071]
The bottle 30 which is a synthetic resin container configured in this way also has the same effect as the bottle 10 already described, and since the reduced pressure absorption part 31 is formed in the body part 11, the heated contents are filled. When a negative pressure generated by the temperature lowering to room temperature later acts, the influence of the reduced pressure can be absorbed without damaging the appearance due to the smooth elastic deformation of the reduced pressure absorbing portion 31, and the reduced pressure absorbing portion 12 can be applied by pressurization. Even if it bulges and deforms, it can be easily restored to its original state.
[0072]
Further, in the reduced pressure absorbing portion 31, the left side wall inclined surface 34 and the left bottom inclined surface 36, and the right side wall inclined surface 35 and the right bottom inclined surface 37 have substantially the same width. Can be dispersed almost uniformly on the respective inclined surfaces, the deformation can be absorbed more smoothly, and the local deformation can be prevented.
[0073]
Further, as shown in FIG. 3, the upper wall inclined surface 17 and the lower wall inclined surface 19 are removed, and the upper and lower inclined surfaces are constituted only by the upper bottom inclined surface 18 and the lower bottom inclined surface 20. The reduced pressure absorbing portion 31 can absorb the influence of the reduced pressure without damaging the appearance due to the smooth elastic deformation of the reduced pressure absorbing portion 31, and the reduced pressure absorbing portion 12 is temporarily expanded by the pressurization. Even if it is deformed, it can be easily restored to its original state.
[0074]
Furthermore, the structure shown in FIG. 4 may be used as the reduced pressure absorption part formed in the synthetic resin container, and this reduced pressure absorption part 51 will be described. The same reference numerals are used for the same parts as those in the embodiment already described. The description is omitted.
[0075]
4A and 4B show an embodiment of a synthetic resin container, wherein FIG. 4A is a front view, FIG. 4B is an AA sectional view, and FIG. 4C is a BB sectional view.
[0076]
The decompression absorbing part 51 formed by being recessed inwardly in the body part 11 has left and right inclined surfaces 52, 53 having left and right side wall inclined surfaces 54, 54 a, 55, 55 a and left and right bottom inclined surfaces 56. , 57, and is equivalent to a structure in which the left and right side wall inclined surfaces 34, 35 described in FIG. 2 are divided into two to form two different inclined surfaces.
[0077]
The decompression absorbing portion 51 also forms a valley line between the left side wall inclined surface 54 and the left side wall inclined surface 54a, and between the right side wall inclined surface 55 and the right side wall inclined surface 55a. The boundary lines 58 and 59 are also curved in a convex shape at the center and opposite to each other. For example, they are arcs, and both ends of the arcs are located at the four corners of the vacuum absorber 51, and the bottom described in FIG. It intersects with the valley lines 38 and 39 and the boundary lines 40 and 41 at the same point, and the upper edge ridge lines 17a and 18a of the upper side wall inclined surface 17 and the upper bottom inclined surface 18 already described in FIG. Alternatively, the lower end ridge lines 19 a and 20 a of the lower wall inclined surface 19 and the lower bottom inclined surface 20 intersect at one point at four corners of the reduced pressure absorbing portion 51.
[0078]
In the reduced pressure absorbing portion 51, the crossing between the left side wall inclined surface 54 and the left side wall inclined surface 54a and between the right side wall inclined surface 55 and the right side wall inclined surface 55a. The surface shape is formed in a V shape and the central portion is recessed inside the trunk portion 11, and the cross-sectional shapes of the left and right bottom inclined surfaces 56 and 57 are also formed in a V shape so that the central portion is the inside of the trunk portion 11. Indented.
[0079]
Accordingly, one inclined surface is formed between the frame-like portion 23 and the reduced pressure absorbing portion 51, and two inclined surfaces are further formed on the side wall inclined surfaces 54, 54a (55, 55a), and the bottom inclined surface 56 (57). Thus, one inclined surface is formed, and four inclined surfaces are formed on both the left and right sides of the center portion.
[0080]
The other configuration is the same as the bottles 10 and 30 which are the synthetic resin containers already described with reference to FIGS.
[0081]
The bottle 50 which is a synthetic resin container configured in this way also has the same effect as that of the bottles 10 and 30 already described, and since the reduced pressure absorption part 51 is formed in the body part 11, the heated contents When the negative pressure generated when the temperature is lowered to room temperature after filling is applied, it is possible to absorb the influence of the reduced pressure without damaging the appearance due to the smooth elastic deformation of the reduced pressure absorbing portion 51, and the reduced pressure absorption by the pressurization. Even if the portion 12 bulges and deforms, it can be easily restored to the original state.
[0082]
Further, in the reduced pressure absorbing portion 51, the left and right side wall portions are formed by dividing the left and right side wall portions into two side wall portion inclined surfaces 54, 54a, 55, and 55a. Can be dispersed more smoothly, the deformation can be absorbed more smoothly, and the local deformation can be prevented.
[0083]
Moreover, in this decompression absorption part 51, since the left and right side wall parts are divided into two side wall part inclined surfaces 54, 54a, 55, and 55a, boundary lines 58 and 59 exist, This makes it easy to ensure the strength of the body portion 11 of the bottle 50.
[0084]
Moreover, the structure shown in FIG. 5 may be sufficient as the reduced pressure absorption part formed in the synthetic resin container, and this reduced pressure absorption part 71 will be described. However, the same symbols are used for the same parts as those already described in the embodiment. The description is omitted.
[0085]
5A and 5B show an embodiment of a synthetic resin container, where FIG. 5A is a front view, FIG. 5B is a central longitudinal sectional view showing only a part of the reduced pressure absorbing portion, and FIG. 5C is a central lateral sectional view. is there.
[0086]
The decompression absorbing portion 71 formed inwardly in the body portion 11 of the bottle 70 has left and right inclined surfaces 72 and 73 having three left and right side wall inclined surfaces 74, 74a, 74b, 75, 75a, and 75b. And the two bottom inclined surfaces 76 and 77 at the center of the left and right, and the left and right side wall inclined surfaces 34 and 35 described in FIG. Although the number of the inclined surfaces is the same as that of the inclined surfaces, in this reduced pressure absorbing portion 71, the end of the boundary line between the inclined surfaces is dispersed without being concentrated at one point at the four corners of the reduced pressure absorbing portion 71. It has been positioned.
[0087]
Further, in this reduced pressure absorbing portion 71, upper and lower bottom inclined surfaces 78 and 79 are arranged between two bottom inclined surfaces 76 and 77 at the center of the left and right, and are composed of 10 inclined surfaces as a whole.
[0088]
In the reduced pressure absorbing portion 71, the end portions of the bottom valley lines 80 and 81, which are arc-shaped opposite to each other so as to be in contact with each other at the center between the two bottom inclined surfaces 76 and 77 at the left and right center, are the upper bottom portion. It is located at both ends of the upper end ridge line 78 a of the inclined surface 78 and at both ends of the lower end ridge line 79 a of the lower bottom inclined surface 79. In addition, the boundary line 82 between the left bottom inclined surface 76 and the left left side wall inclined surface 74 is positioned outside the bottom valley line 80 and on the upper ridge line 71a and the lower ridge line 71b of the decompression absorbing portion 71. In contrast, the boundary line 83 between the right bottom inclined surface 77 and the right side wall inclined surface 75 on the outer side is the outside of the bottom valley line 81 and the upper ridge line 71a and the lower ridge line of the decompression absorbing part 71. 71b.
[0089]
Further, a boundary line 84 between the left side wall inclined surface 74 and the outer left side wall inclined surface 74a, and between the left side wall inclined surface 74a and the outer left side wall inclined surface 74b. The boundary line 84a is located at both ends on the left ridge line 71c of the decompression absorbing portion 71, and symmetrically, the boundary line 85 between the right side wall inclined surface 75 and the outer right side wall inclined surface 75a, and The boundary line 85 a between the right side wall inclined surface 75 a and the outer right side wall inclined surface 75 b is located at both ends on the right ridge line 71 d of the reduced pressure absorber 71. Note that these boundary lines are each composed of a curved line such as an arc whose center is convex.
[0090]
Further, in this reduced pressure absorbing portion 71, unlike the previously described reduced pressure absorbing portions 12, 31, 51, the upper and lower inclined surfaces are constituted by only one inclined surface consisting of the upper and lower bottom inclined surfaces 78, 79. For this reason, as shown in an enlarged view in FIG. 5 (b), reinforcing slopes 86 and 87 formed of small slopes are formed at the upper and lower end edges.
[0091]
Other configurations are the same as the bottles 10, 30, and 50, which are the synthetic resin containers already described with reference to FIGS.
[0092]
The bottle 70 which is a synthetic resin container configured in this manner also has the same effect as the bottles 10, 30, 50 already described, and since the reduced pressure absorbing portion 71 is formed in the body portion 11, the bottle 70 is heated. When negative pressure generated by lowering the temperature to normal temperature after filling the contents acts, it is possible to absorb the influence of reduced pressure without damaging the appearance by smooth elastic deformation of the reduced pressure absorbing portion 71, and by pressurization. Even if the decompression absorbing portion 12 is once bulged and deformed, it can be easily restored to the original state.
[0093]
Further, in the reduced pressure absorbing portion 71, the left and right side wall surfaces are each composed of four inclined surfaces. For example, the left side includes side wall inclined surfaces 74, 74a, 74b and a bottom inclined surface 76, and a boundary line is provided. Since it is dispersed without concentrating on one point, each inclined surface is easy to move without being constrained by decompression etc., and the deformation is distributed almost uniformly on each inclined surface, so the deformation is smoother Can be absorbed, and local deformation can be prevented.
[0094]
In each of the above-described embodiments, the case where the present invention is applied to a 500 ml plastic bottle having a substantially circular cross section has been described as an example. However, the present invention is not limited to this. It can be applied to containers as well.
[0095]
【The invention's effect】
As described above in detail with the embodiment, according to the synthetic resin container according to claim 1 of the present invention, the cylinder portion having the cylindrical shape is allowed to be elastically deformed by the reduced pressure generated inside. It is a synthetic resin container in which a plurality of absorbing portions are arranged, and a plurality of reinforcing strips are formed on at least one of the upper and lower body portions of the vacuum absorbing portion, and these reinforcing strips are formed in a substantially parallelogram shape. Placed on the four sides of Mountain line strip, The four sides Connects vertices that form an acute angle of a substantially parallelogram shape. Arranged Consists of the valley line section In addition, the two parallel sides of the substantially parallelogram-shaped ridges of the four sides are inclined with respect to the axis of the trunk portion. Therefore, by forming a plurality of reinforcing strips by oblique concave strips or convex reinforcing portions in the body portion, it is possible to ensure the necessary strength and rigidity against longitudinal compression and lateral compression even when a decompression absorbing portion is provided. it can.
Furthermore, since the reinforcing strip is formed on at least one of the upper and lower barrels of the reduced pressure absorbing portion, the reinforcing strip is formed either above or below the reduced pressure absorbing portion, or both above and below. By providing the portion, the required strength and rigidity can be ensured even when the vacuum absorbing portion is provided.
In addition, the reinforcing strip portion is composed of a mountain line strip portion arranged on four sides of a substantially parallelogram shape, and a valley wire strip portion arranged by connecting apexes that are acute angles of the substantially parallelogram shape of the four sides, Since the two parallel sides of the substantially parallelogram-shaped ridges of the four sides are inclined with respect to the axis of the trunk, Strength and rigidity can be increased.
[0096]
According to the synthetic resin container of claim 2 of the present invention, the reinforcing strip portion The body part formed with the maximum body diameter part Therefore, it is possible to ensure the strength and rigidity of the maximum body diameter part, which is the thickest part of the body part necessary for containers to come into contact with each other during transportation or loading into a vending machine.
[0097]
Furthermore, according to the synthetic resin container according to claim 3 of the present invention, the reinforcing ridges are formed so that the front and rear ends of the reinforcing ridges adjacent to each other overlap each other. By overlapping, the strength and rigidity can be further increased.
[0098]
According to the synthetic resin container of claim 4 of the present invention, since the overlapping range of the front and rear ends of the reinforcing strip is 30 to 50% in the transverse direction of the trunk, By overlapping 30 to 50% in the orthogonal transverse direction (width direction), the strength and rigidity can be increased efficiently.
[Brief description of the drawings]
1A and 1B show an embodiment of a synthetic resin container according to the present invention, in which FIG. 1A is a front view, FIG. 1B is a partially enlarged view of a reinforcing strip, and FIG. (D) is AA sectional drawing, (e) is explanatory sectional drawing of the trough ridgeline of a reinforcement strip.
2A and 2B show an embodiment of the synthetic resin container according to the present invention, in which FIG. 2A is a front view, FIG. 2B is an AA cross-sectional view, and FIG. 2C is an explanatory cross section of a valley ridge line of a reinforcing strip. FIG.
FIG. 3 is a front view according to still another embodiment of the synthetic resin container of the present invention.
4A is a front view, FIG. 4B is a cross-sectional view taken along the line AA, and FIG. 4C is a cross-sectional view taken along the line BB.
5A and 5B show still another reduced pressure absorbing portion of the synthetic resin container according to the present invention, in which FIG. 5A is a front view, FIG. 5B is a central longitudinal sectional view in which only the reduced pressure absorbing portion is enlarged, and FIG. Is a central cross-sectional view.
FIG. 6 is a cross-sectional view of the left half of a PET bottle provided with a conventional vacuum absorbing part.
[Explanation of symbols]
10, 30, 50, 70 bottles (synthetic resin containers)
11 Torso
12, 31, 51, 71 Vacuum absorbing part
90 Reinforcing strip
91 Maximum diameter
92 Mountain Line
92a, 92b Top and bottom mountain line strips
92c, 92d Left and right mountain line sections
93 trough line (diagonal line)
94,95 inclined surface
13 Center vertical section
14 Center
15, 32, 52, 72 Left inclined surface
15a Outside ridge line
16, 33, 53, 73 Right slope
16a Outer edge
17 Upper wall sloped surface
17a Top edge line
18, 78 Upper bottom inclined surface
18a Top edge line
19 Inclined surface of lower wall
19a Bottom edge ridgeline
20,79 Lower bottom inclined surface
20a Bottom edge ridgeline
21, 38, 80 Left bottom valley line
22, 39, 81 Bottom bottom valley line
23 Frame-shaped part
34, 54, 54a, 74, 74a, 74b Left side wall inclined surface
35, 55, 55a, 75, 75a, 75b Right side wall sloped surface
36, 56, 76, 82, 84, 84a Left bottom inclined surface
37, 57, 77, 83, 85, 85a Right bottom slope
40,58 Left border
41,59 Right border
Reinforced slope on 86
87 Lower reinforcement slope

Claims (4)

筒形状をなす胴部に、内部に生じる減圧により弾性変形を可能とする減圧吸収部が複数配列された合成樹脂製容器であって、
前記減圧吸収部の少なくとも上方または下方のいずれか一方の前記胴部に補強条部を複数形成し、これら補強条部を略平行四辺形状の四辺に配置される山線条部と、当該四辺の略平行四辺形状の鋭角となる頂点を結んで配置される谷線条部とで構成するとともに、前記四辺の略平行四辺形状の山線条部の平行な2辺を前記胴部の軸線に対して傾斜して配置したことを特徴とする合成樹脂製容器。
A cylindrical resin body is a synthetic resin container in which a plurality of reduced pressure absorption parts that enable elastic deformation by reduced pressure generated inside,
A plurality of reinforcing strips are formed on at least one of the upper and lower body portions of the vacuum absorbing portion, and the reinforcing strips are arranged on four sides of a substantially parallelogram , the vertex to be the substantially parallelogram-shaped acute angle with configuring the valley linear portions and disposed Nde binding, two parallel sides of the parallelogram-shaped peaks linear portions of the four sides with respect to the axis of the barrel A synthetic resin container characterized by being inclined and arranged .
前記補強条部が形成される前記胴部を最大胴径部としたことを特徴とする請求項1記載の合成樹脂製容器。   The synthetic resin container according to claim 1, wherein the body part in which the reinforcing strip part is formed is a maximum body diameter part. 前記補強条部を、互いに隣接する補強条部の先後端が重複するように形成したことを特徴とする請求項1または2記載の合成樹脂製容器。  The synthetic resin container according to claim 1 or 2, wherein the reinforcing strips are formed so that the front and rear ends of the reinforcing strips adjacent to each other overlap each other. 前記補強条部の先後端の重複範囲を、前記胴部の横断方向で30〜50%としたことを特徴とする請求項3記載の合成樹脂製容器。   The synthetic resin container according to claim 3, wherein the overlapping range of the front and rear ends of the reinforcing strips is 30 to 50% in the transverse direction of the trunk portion.
JP2001250208A 2001-08-21 2001-08-21 Plastic container Expired - Fee Related JP4395696B2 (en)

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JP4911884B2 (en) * 2004-08-06 2012-04-04 大日本印刷株式会社 Plastic bottle container
JP4683275B2 (en) 2005-05-10 2011-05-18 サントリーホールディングス株式会社 Resin storage container
JP4991130B2 (en) * 2005-07-29 2012-08-01 株式会社吉野工業所 Bottle
JP4749952B2 (en) * 2006-06-29 2011-08-17 株式会社吉野工業所 Bottle
JP2010036943A (en) * 2008-08-01 2010-02-18 Dainippon Printing Co Ltd Plastic bottle
JP2010076821A (en) * 2008-09-26 2010-04-08 Yoshino Kogyosho Co Ltd Blow bottle made of synthetic resin
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