JP2005008153A

JP2005008153A - Bottle made of synthetic resin

Info

Publication number: JP2005008153A
Application number: JP2003171196A
Authority: JP
Inventors: Takeyoshi Shibuya; 剛美渋谷
Original assignee: Dai Nippon Printing Co Ltd
Current assignee: Dai Nippon Printing Co Ltd
Priority date: 2003-06-16
Filing date: 2003-06-16
Publication date: 2005-01-13

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bottle made of a rigid synthetic resin, which prevents the bottle from being deformed caused by receiving a vertical load or a lateral pressure in a process of filling a content into the bottle, during storing or the like. <P>SOLUTION: The bottle made of the synthetic resin has a polygonal barrel composed of plane wall parts and corner angle parts, and an annular recessed rib caving in from the outer peripheral surface of the bottle in the vicinity to the center of the barrel. The annular recessed rib comprises first recessed parts corresponding to the area near the center of the plane walls, second recessed parts which are shallower than the first recessed parts and continuous with both ends of the first recessed parts via transfer parts of sloped or curved surfaces, and third recessed parts which are formed to correspond to the corner angle parts and are continuous with and shallower than the second recessed parts. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は合成樹脂製角型壜体、特にその圧縮強度を向上させた壜体胴部の構造に関する。
【０００２】
【従来の技術】
従来から、角型のポリエチレンテレフタレート、ポリプロピレン等の合成樹脂製二軸延伸吹込成形壜体が用いられている。この容器に垂直荷重が加わると、隅角部付近に応力が集中し、壜体は座屈し、容器は変形する。
【０００３】
現在、環境問題等を配慮して、容器重量を減少する傾向があり、そのため必然的に容器の肉圧が薄くなり、容器の強度が弱くなっている。
【０００４】
このため、容器内への包装内容物の充填、容器搬送等のハンドリング時や、容器をダンボールに詰めしたものを保管のため段積みする過程、輸送過程、更に商品陳列の際の取り扱い時に容器に外力が加わることにより容器が変形し商品価値の低下を招くことがある。
【０００５】
特許文献１には、角筒形状胴部に周溝を形成したプラスチックボトルにおいて、前記周溝の深さをパネル壁部では均一深さとし、隅角部ではパネル壁部での深さの０〜４／５倍の深さに形成し、前記周溝の幅を胴部全周にわたって同一に形成することにより、応力集中を起こりにくくなり、変形に対する抵抗が強くなり、圧縮強度が向上することが記載されている。
【０００６】
【特許文献１】
実公平７−５１４６０号公報
【０００７】
【発明が解決しようとする課題】
しかし、この特許文献１に記載の容器の構成では容器の胴部に側圧が加わった時の剛性が十分とはいえずそのため変形がおこることがある。
【０００８】
本発明の目的は、容器内への内容物の充填工程、保管時等において容器が垂直荷重及び側圧を受けることによる変形を防止した剛性樹脂製壜体を提供することである。
【０００９】
【課題を解決するための手段】
請求項１に記載の発明は、上記の課題を解決するもので、平面壁部と隅角部からなる多角形胴部を有し、胴部中央部付近に容器外周面からへこんだ環状凹陥リブを有する合成樹脂製壜体であって、該環状凹陥リブは、平面壁部中央付近の領域に対応する第１の凹陥部と該第１の凹陥部よりも浅い、該第１の凹陥部の両端に傾斜面状または湾曲面状の移行部を介して連続する第２の凹陥部と、隅角部に対応して形成された第２の凹陥部に連続する、第２の凹陥部よりも浅い第３の凹陥部を備えることを特徴とする合成樹脂製壜体を要旨とする。
【００１０】
請求項１に記載の発明によれば、環状凹陥リブは、平面壁部中央付近の領域に対応する第１の凹陥部と該第１の凹陥部よりも浅い、該第１の凹陥部の両端に傾斜面状または湾曲面状の移行部を介して連続する第２の凹陥部と、隅角部に対応して形成された、第２の凹陥部に連続する、第２の凹陥部よりも浅い第３の凹陥部を備えるので、壜体に垂直荷重が加えられたとき、第１の凹陥部及び第２の凹陥部は弾性変形して垂直荷重の一部を吸収する。一方、前記の最も浅い第３の凹陥部は第１、第２の両凹陥部に比して弾性変形が起こりにくく、その結果環状凹陥リブ全体の変形は大きくならず、第３の凹陥部により垂直荷重に対する耐久力が主に付与される。また、この二つの作用により高い座屈強度が得られるのみならず、容器内方へ突出する第１の凹陥部は高い耐内圧性を容器に付与しホットパック充填後の減圧またはホットウォーマー内に商品を展示して加温販売するとき容器内の圧力の上昇に対して優れた耐内圧性が奏せられる。
【００１１】
請求項２に記載の発明は、上記の課題を解決するもので、平面壁部と隅角部からなる多角形胴部を有し、胴部中央部付近に容器外周面からへこんだ環状凹陥リブを有する合成樹脂製壜体であって、環状凹陥リブで分割された上下の多角形胴部の隅角部に該隅角部の周方向中央部が最もへこんだ形状の隅角部凹陥リブを備えることを特徴とする合成樹脂製壜体を要旨とする。
【００１２】
請求項２に記載の発明によれば、隅角部凹陥部によって隅角部に剛性と耐内圧性が付与され、従来の容器に比較して高い座屈強度を有する上にホットパック充填後の減圧またはホットウォーマー内に商品を展示して加温販売するとき容器内の圧力の上昇に対して優れた耐内圧性を示す合成樹脂製壜体を提供することができる。
【００１３】
請求項３に記載の発明は、上記の課題を解決するもので、環状凹陥リブは、平面壁部中央付近の領域に対応する第１の凹陥部と該第１の凹陥部よりも浅い、該第１の凹陥部の両端に傾斜面状または湾曲面状の移行部を介して連続する第２の凹陥部と、隅角部に対応して形成された、第２の凹陥部に連続する、第２の凹陥部よりも浅い第３の凹陥部を備えることを特徴とする請求項２に記載の合成樹脂製壜体を要旨とする。
【００１４】
請求項３に記載の発明によれば、請求項１に記載の発明の効果が奏せられる上に、更に隅角部凹陥部によって隅角部に剛性と耐内圧性が付与され、従来の容器に比較して高い座屈強度を有する上にホットパック充填後の減圧またはホットウォーマー内に商品を展示して加温販売するとき容器内の圧力の上昇に対して優れた耐内圧性を示す合成樹脂製壜体を提供することができる。
【００１５】
請求項４に記載の発明は、上記の課題を解決するもので、平面壁部と隅角部からなる多角形胴部を有し、胴部中央部付近に容器外周面からへこんだ環状凹陥リブを有する合成樹脂製壜体であって、壜体肩部隅角部及び／又は壜体底部周壁隅角部に四角錐状凹陥リブを有することを特徴とする合成樹脂製壜体を要旨とする。
【００１６】
請求項４に記載の発明によれば、四角錐状凹陥リブによって壜体肩部隅角部及び／又は壜体底部周壁隅角部に剛性と耐内圧性が付与され、従来の容器に比較して高い座屈強度を有する上にホットパック充填後の減圧またはホットウォーマー内に商品を展示して加温販売するとき容器内の圧力の上昇に対して優れた耐内圧性を示す合成樹脂製壜体を提供することができる。
【００１７】
請求項５に記載の発明は、上記の課題を解決するもので、環状凹陥リブは、平面壁部中央付近の領域に対応する第１の凹陥部と該第１の凹陥部よりも浅い、該第１の凹陥部の両端に傾斜面状または湾曲面状の移行部を介して連続する第２の凹陥部と、隅角部に対応して形成された、第２の凹陥部に連続する、第２の凹陥部よりも浅い第３の凹陥部を備えることを特徴とする請求項４に記載の合成樹脂製壜体を要旨とする。
【００１８】
請求項５に記載の発明によれば、請求項１に記載の発明の効果が奏せられる上に、四角錐状凹陥リブによって壜体肩部隅角部及び／又は壜体底部周壁隅角部に剛性と耐内圧性が付与され、従来の容器に比較して高い座屈強度を有する上にホットパック充填後の減圧またはホットウォーマー内に商品を展示して加温販売するとき容器内の圧力の上昇に対して優れた耐内圧性を示す合成樹脂製壜体を提供することができる。
【００１９】
請求項６に記載の発明は、上記の課題を解決するもので、環状凹陥リブで分割された上下の多角形胴部の隅角部に該隅角部の周方向中央部が最もへこんだ形状の隅角部凹陥リブを備えることを特徴とする請求項５に記載の合成樹脂製壜体を要旨とする。
【００２０】
請求項６に記載の発明によれば、請求項１及び請求項２に記載の発明の効果が奏せられる上に、四角錐状凹陥リブによって壜体肩部隅角部及び／又は壜体底部周壁隅角部に剛性と耐内圧性が付与され、従来の容器に比較して高い座屈強度を有する上にホットパック充填後の減圧またはホットウォーマー内に商品を展示して加温販売するとき容器内の圧力の上昇に対して優れた耐内圧性を示す合成樹脂製壜体を提供することができる。
【００２１】
【発明の実施の形態】
図１（Ａ）乃至（Ｃ）は、第１の発明の実施の形態の合成樹脂製壜体を示し、（Ａ）は側面図、（Ｂ）は図１（Ａ）図示のＤ−Ｄ線矢視断面図、（Ｃ）は上面図である。図２は図１（Ｃ）図示のＡ−Ｃの方向に見た図である。図３は図１に示す合成樹脂製壜体の隅角部のほうから見た側面図である。
【００２２】
第１の発明の合成樹脂製壜体は、ポリエチレンテレフタレート、ポリプロピレン等の合成樹脂製二軸延伸吹込成形体であって、平面壁部６ａ、６ｂと隅角部７ａ、７ｂからなる多角形胴部を有し、胴部中央部付近に容器外周面からへこんだ環状凹陥リブ１を有する合成樹脂製壜体である。この環状凹陥リブ１は、平面壁部中央付近の領域に対応する第１の凹陥部２と、この第１の凹陥部２よりも浅い、各第１の凹陥部２の両端に傾斜面状または湾曲面状の移行部３ａを介して連続する第２の凹陥部４と、隅角部７ａ、７ｂに対応して形成された第２の凹陥部４に傾斜面または湾曲面状の移行部３ｂを介して連続する、第２の凹陥部４よりも浅い第３の凹陥部５を備える。即ち、第１の凹陥部２の壜体外周面からの深さをＬ１、第２の凹陥部４の壜体外周面からの深さをＬ２、第３の凹陥部５の壜体外周面からの深さをＬ３とすると、Ｌ１＞Ｌ２＞Ｌ３となる。
【００２３】
更に上記合成樹脂製壜体には、上下の平面壁部６ａ、６ｂに横方向の突出リブ１０と縦方向の突出リブ１１からなるパネル部が設けられ、且つ上の平面壁部６ａには壜体の内方へ凹陥した横方向の凹陥リブ１２が設けられ、平面壁部６ａ、６ｂに剛性が付与されている。
【００２４】
第１の発明の合成樹脂製壜体は、環状凹陥リブ１は、平面壁部中央付近の領域に対応する第１の凹陥部２と第１の凹陥部２よりも浅い、第１の凹陥部２の両端に傾斜面状または湾曲面状の移行部３ａを介して連続する第２の凹陥部４と、隅角部７ａ、７ｂに対応して形成された、第２の凹陥部４に傾斜面状または湾曲面状の移行部３ｂを介して連続する、第２の凹陥部４よりも浅い第３の凹陥部５を備えるので、壜体に垂直荷重が加えられたとき、第１の凹陥部２及び第２の凹陥部４は弾性変形して垂直荷重の一部を吸収する。一方、前記の最も浅い第３の凹陥部５は第１の凹陥部２及び第２の両凹陥部４に比して弾性変形が起こりにくく、その結果環状凹陥リブ１全体の変形は大きくならず、第３の凹陥部５により垂直荷重に対する耐久力が主に付与される。また、この二つの作用により高い座屈強度が得られるのみならず、壜体内方へ突出する第１の凹陥部２は高い耐内圧性を容器に付与しホットパック充填後の減圧またはホットウォーマー内に商品を展示して加温販売するとき壜体内の圧力の上昇に対して優れた耐内圧性が奏せられる。
【００２５】
図４（Ａ）乃至（Ｃ）は、第２の発明の実施の形態の合成樹脂製壜体を示し、（Ａ）は側面図、（Ｂ）は図４（Ａ）図示のＤ−Ｄ線矢視断面図、（Ｃ）は上面図である。図５は図４（Ｃ）図示のＡ−Ｃの方向に見た図である。図６は図４に示す合成樹脂製壜体の隅角部のほうから見た側面図である。
【００２６】
第２の発明の合成樹脂製壜体は、平面壁部６ａ、６ｂと隅角部７ａ、７ｂからなる多角形胴部を有し、胴部中央部付近に容器外周面からへこんだ環状凹陥リブ１を有する合成樹脂製壜体において、環状凹陥リブ１で分割された上下の多角形胴部の隅角部７ａ、７ｂにこれらの隅角部７ａ、７ｂの周方向中央部が最もへこんだ形状の隅角部凹陥リブ１３を備えることを特徴とするものである。
【００２７】
第２の発明の合成樹脂製壜体は、隅角部凹陥リブ１３によって隅角部７ａ、７ｂに剛性と耐内圧性が付与され、従来の容器に比較して高い座屈強度を有する上にホットパック充填後の減圧またはホットウォーマー内に商品を展示して加温販売するとき容器内の圧力の上昇に対して優れた耐内圧性を示す。
【００２８】
第２の発明の実施の形態において、環状凹陥リブ１は、従来の壜体におけるように全周にわたって等しい深さで形成された環状凹陥リブであってもよい。しかし、環状凹陥リブ１は、平面壁部中央付近の領域に対応する深さＬ１の第１の凹陥部２と、この第１の凹陥部２よりも浅い、各第１の凹陥部２の両端に傾斜面状または湾曲面状の移行部３ａを介して連続する深さＬ２の第２の凹陥部４と、隅角部７ａ、７ｂに対応して形成された第２の凹陥部４に傾斜面または湾曲面状の移行部３ｂを介して連続する、第２の凹陥部４よりも浅い深さＬ３の第３の凹陥部５を備えるものが、隅角部凹陥リブ１３と環状凹陥リブ１の相乗作用により更に高い座屈強度が得られので望ましい。
【００２９】
図７（Ａ）乃至（Ｃ）は、第３の発明の実施の形態の合成樹脂製壜体を示し、（Ａ）は側面図、（Ｂ）は図７（Ａ）図示のＤ−Ｄ線矢視断面図、（Ｃ）は上面図である。図８は図７（Ｃ）図示のＡ−Ｃ線の方向に見た図である。図９は図７に示す合成樹脂製壜体の隅角部のほうから見た側面図である。
【００３０】
第３の発明の実施の形態の合成樹脂製壜体は、平面壁部６ａ、６ｂと隅角部７ａ、７ｂからなる多角形胴部を有し、胴部中央部付近に容器外周面からへこんだ環状凹陥リブ１を有する合成樹脂製壜体において、壜体肩部隅角部８及び壜体底部周壁隅角部９にそれぞれ四角錐状凹陥リブ１４、１５を有することを特徴とするものである。
【００３１】
尚、四角錐状凹陥部はを壜体肩部隅角部８または壜体底部周壁隅角部９の何れかに設けるだけの構成でもよい。
【００３２】
第３の発明の実施の形態の合成樹脂性壜体は、四角錐状凹陥リブによって壜体肩部隅角部及び／又は壜体底部隅角部に剛性と耐内圧性が付与され、従来の容器に比較して高い座屈強度を有する上にホットパック充填後の減圧またはホットウォーマー内に商品を展示して加温販売するとき容器内の圧力の上昇に対して優れた耐内圧性を示す。
【００３３】
第３の発明の実施の形態において、環状凹陥リブ１は、従来の壜体におけるように全周にわたって等しい深さで形成された環状凹陥リブであってもよい。しかし、環状凹陥リブ１は、平面壁部中央付近の領域に対応する深さＬ１の第１の凹陥部２と、この第１の凹陥部２よりも浅い、各第１の凹陥部２の両端に傾斜面状または湾曲面状の移行部３ａを介して連続する深さＬ２の第２の凹陥部４と、隅角部７ａ、７ｂに対応して形成された第２の凹陥部４に傾斜面または湾曲面状の移行部３ｂを介して連続する、第２の凹陥部４よりも浅い深さＬ３の第３の凹陥部５を備えるものが、隅角部凹陥リブ１３と環状凹陥リブ１の相乗作用により更に高い座屈強度が得られるので望ましい。
【００３４】
図１０（Ａ）乃至（Ｃ）は、第４の発明の実施の形態の合成樹脂製壜体を示し、（Ａ）は側面図、（Ｂ）は図１０（Ａ）図示のＤ−Ｄ線矢視断面図、（Ｃ）は上面図である。図１１は図１０（Ｃ）図示のＡ−Ｃ線の方向に見た図である。図１２は図１０に示す合成樹脂製壜体の隅角部のほうから見た側面図である。
【００３５】
第４の発明の実施の形態の合成樹脂製壜体は、平面壁部６ａ、６ｂと隅角部７ａ、７ｂからなる多角形胴部を有し、胴部中央部付近に容器外周面からへこんだ環状凹陥リブ１を有する合成樹脂製壜体において、壜体肩部隅角部８及び壜体底部周壁隅角部９にそれぞれ四角錐状凹陥リブ１４、１５を有し、且つ環状凹陥リブ１で分割された上下の多角形胴部の隅角部７ａ、７ｂにこれらの隅角部７ａ、７ｂの周方向中央部が最もへこんだ形状の隅角部凹陥リブ１３を備えることを特徴とするものである。
【００３６】
第４の発明の実施の形態において、環状凹陥リブ１は、従来の壜体におけるように全周にわたって等しい深さで形成された環状凹陥リブであってもよい。しかし、環状凹陥リブ１は、平面壁部中央付近の領域に対応する深さＬ１の第１の凹陥部２と、この第１の凹陥部２よりも浅い、各第１の凹陥部２の両端に傾斜面状または湾曲面状の移行部３ａを介して連続する深さＬ２の第２の凹陥部４と、隅角部７ａ、７ｂに対応して形成された第２の凹陥部４に傾斜面または湾曲面状の移行部３ｂを介して連続する、第２の凹陥部４よりも浅い深さＬ３の第３の凹陥部５を備えるものが、四角錐状凹陥リブ１４、１５及び隅角部凹陥リブ１３と環状凹陥リブ１の相乗作用により更に高い座屈強度が得られるので望ましい。
【００３７】
【実施例】
（実施例１）
図１（Ａ）乃至（Ｃ）に示すように、平面壁部６ａ、６ｂと隅角部７ａ、７ｂからなる多角形胴部を有し、胴部中央部付近に容器外周面からへこんだ環状凹陥リブ１を有する合成樹脂製壜体において、環状凹陥リブ１は、平面壁部中央付近の領域に対応する第１の凹陥部２と、第１の凹陥部２よりも浅い、第１の凹陥部２の両端に傾斜面状または湾曲面状の移行部３ａを介して連続する第２の凹陥部４と、隅角部に対応して形成された第２の凹陥部４に連続する、第２の凹陥部４よりも浅い第３の凹陥部５を備える合成樹脂製壜体を作製した。
【００３８】
この壜体に垂直荷重をかけて座屈強度を測定した。その結果垂直荷重が２５５Ｎのとき肩部において座屈が生じた。この座屈強度は下記の比較例で示す従来型の壜体について測定した座屈強度２００Ｎに比較して高く、前記のように環状凹陥リブ１を設けることにより強度がアップされることがわかった。
【００３９】
（実施例２）
図４（Ａ）に示すように、平面壁部６ａ、６ｂと隅角部７ａ、７ｂからなる多角形胴部を有し、胴部中央部付近に容器外周面からへこんだ環状凹陥リブを有する合成樹脂製壜体において、環状凹陥リブで分割された上下の多角形胴部の隅角部７ａ、７ｂにこれらの隅角部７ａ、７ｂの周方向中央部が最もへこんだ形状の隅角部凹陥リブ１３を備え、環状凹陥リブは従来の壜体におけるように全周にわたり等しい深さの環状凹陥リブである合成樹脂製壜体を作製した。
【００４０】
この壜体に垂直荷重を掛けて座屈強度を測定した。その結果垂直荷重が２２０Ｎのとき、環状凹陥リブの隅角部において座屈が生じた。この座屈強度は下記の比較例で示す従来型の壜体について測定した座屈強度２００Ｎに比較して高く、前記のように隅角部凹陥リブ１３を設けることにより強度がアップされることがわかった。
【００４１】
（実施例３）
図７（Ａ）に示すように、平面壁部６ａ、６ｂと隅角部７ａ、７ｂからなる多角形胴部を有し、胴部中央部付近に容器外周面からへこんだ環状凹陥リブを有する合成樹脂製壜体において、壜体肩部隅角部８及び壜体底部周壁隅角部９にそれぞれ四角錐状凹陥リブ１４、１５を有し、環状凹陥リブは従来の壜体におけるように全周にわたり等しい深さの環状凹陥リブである合成樹脂製壜体を作製した。
【００４２】
この壜体に垂直荷重を掛けて座屈強度を測定した。その結果垂直荷重が２３０Ｎのとき環状凹陥部の隅角部において座屈が生じた。この座屈強度は下記の比較例で示す従来型の壜体について測定した座屈強度２００Ｎに比較して高く、前記のように四角錐凹陥リブ１４、１５を設けることにより強度がアップされることがわかった。
【００４３】
（実施例４）
図１０（Ａ）乃至（Ｃ）に示すように、平面壁部６ａ、６ｂと隅角部７ａ、７ｂからなる多角形胴部を有し、胴部中央部付近に容器外周面からへこんだ環状凹陥リブを有する合成樹脂製壜体において、環状凹陥リブで分割された上下の多角形胴部の隅角部７ａ、７ｂにこれらの隅角部７ａ、７ｂの周方向中央部が最もへこんだ形状の隅角部凹陥リブ１３を備え、且つ壜体肩部隅角部８及び壜体底部周壁隅角部９にそれぞれ四角錐状凹陥リブ１４、１５を有し、環状凹陥リブ１は、平面壁部中央付近の領域に対応する第１の凹陥部２と、第１の凹陥部２よりも浅い、第１の凹陥部２の両端に傾斜面状または湾曲面状の移行部３ａを介して連続する第２の凹陥部４と、隅角部に対応して形成された第２の凹陥部４に連続する、第２の凹陥部４よりも浅い第３の凹陥部５を備える合成樹脂製壜体を作製した。
【００４４】
この壜体に垂直荷重を掛けて座屈強度を測定した。その結果垂直荷重が３２０Ｎのとき環状凹陥部の隅角部において座屈が生じた。この座屈強度は下記の比較例で示す従来型の壜体について測定した座屈強度２００Ｎに比較して高く、前記のように隅角部凹陥リブ、四角錐凹陥リブ１４、１５及び環状凹陥リブ１を設けることにより強度がアップされることがわかった。
【００４５】
（比較例）
実施例１と同様な、図１（Ａ）に示すように平面壁部６ａ、６ｂと隅角部７ａ、７ｂからなる多角形胴部を有し、胴部中央部付近に容器外周面からへこんだ環状凹陥リブ１を有し、但し環状凹陥リブ１は従来の壜体におけるように全周にわたり等しい深さの環状凹陥リブである従来型の合成樹脂製壜体を作製した。
【００４６】
この壜体に垂直荷重を掛けて座屈強度を測定した。その結果垂直荷重が２００Ｎのとき環状凹陥部の隅角部において座屈が生じた。
【００４７】
以上延べた実施例１乃至実施例４及び比較例から明らかなように、
（１）平面壁部と隅角部からなる多角形胴部を有し、胴部中央部付近に容器外周面からへこんだ環状凹陥リブを有する合成樹脂製壜体において、該環状凹陥リブを、平面壁部中央付近の領域に対応する第１の凹陥部と該第１の凹陥部よりも浅い、該第１の凹陥部の両端に傾斜面状または湾曲面状の移行部を介して連続する第２の凹陥部と、隅角部に対応して形成された、第２の凹陥部に連続する、第２の凹陥部よりも浅い第３の凹陥部を備える構成とすることにより、または、
（２）平面壁部と隅角部からなる多角形胴部を有し、胴部中央部付近に容器外周面からへこんだ環状凹陥リブを有する合成樹脂製壜体において、環状凹陥リブで分割された上下の多角形胴部の隅角部に該隅角部の周方向中央部が最もへこんだ形状の隅角部凹陥リブを備えることにより、または、
（３）平面壁部と隅角部からなる多角形胴部を有し、胴部中央部付近に容器外周面からへこんだ環状凹陥リブを有する合成樹脂製壜体において、壜体肩部隅角部及び／又は壜体底部周壁隅角部に四角錐状凹陥リブ備えることにより、または、
（４）平面壁部と隅角部からなる多角形胴部を有し、胴部中央部付近に容器外周面からへこんだ環状凹陥リブを有する合成樹脂製壜体の構成を、上記（１）（２）（３）構成を全て含む構成とすることにより、
従来型の合成樹脂製壜体に比較して座屈強度の高い合成樹脂製壜体を得ることができる。
【００４８】
【発明の効果】
以上詳細に説明したように、請求項１乃至請求項６に記載の発明によれば、従来の容器に比較して高い座屈強度を有するのみならずホットパック充填後の減圧またはホットウォーマー内に商品を展示して加温販売するとき容器内の圧力の上昇に対して優れた耐内圧性を示す合成樹脂製壜体を提供することができる。
【図面の簡単な説明】
【図１】第１の発明の実施の形態の合成樹脂製壜体を示し、（Ａ）は側面図、（Ｂ）は図１（Ａ）図示のＤ−Ｄ線矢視断面図、（Ｃ）は上面図である。
【図２】図１（Ｃ）図示のＡ−Ｃの方向に見た図である。
【図３】図１に示す合成樹脂製壜体の隅角部のほうから見た側面図である。
【図４】第２の発明の実施の形態の合成樹脂製壜体を示し、（Ａ）は側面図、（Ｂ）は図４（Ａ）図示のＤ−Ｄ線矢視断面図、（Ｃ）は上面図である。
【図５】図４（Ｃ）図示のＡ−Ｃの方向に見た図である。
【図６】図４に示す合成樹脂製壜体の隅角部のほうから見た側面図である。
【図７】第３の発明の実施の形態の合成樹脂製壜体を示し、（Ａ）は側面図、（Ｂ）は図７（Ａ）図示のＤ−Ｄ線矢視断面図、（Ｃ）は上面図である。
【図８】図７（Ｃ）図示のＡ−Ｃの方向に見た図である。
【図９】図７に示す合成樹脂製壜体の隅角部のほうから見た側面図である。
【図１０】第４の発明の実施の形態の合成樹脂製壜体を示し、（Ａ）は側面図、（Ｂ）は図１０（Ａ）図示のＤ−Ｄ線矢視断面図、（Ｃ）は上面図である。
【図１１】図１０（Ｃ）図示のＡ−Ｃの方向に見た図である。
【図１２】図１０に示す合成樹脂製壜体の隅角部のほうから見た側面図である。
【符号の説明】
１環状凹陥リブ
２第１の凹陥部
３ａ移行部
３ｂ移行部
４第２の凹陥部
５第３の凹陥部
６ａ、６ｂ平面壁部
７ａ、７ｂ隅角部
８壜体肩部隅角部
９壜体底部周壁隅角部
１０横方向の突出リブ
１１縦方向の突出リブ
１２横方向の凹陥リブ
１３隅角部凹陥リブ
１４四角錐状凹陥リブ
１５四角錐状凹陥リブ
Ｌ１第１の凹陥部の深さ
Ｌ２第２の凹陥部の深さ
Ｌ３第３の凹陥部の深さ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a synthetic resin prismatic casing, and more particularly, to a structure of a casing body having improved compressive strength.
[0002]
[Prior art]
Conventionally, a biaxially stretched blow molded casing made of synthetic resin such as square polyethylene terephthalate and polypropylene has been used. When a vertical load is applied to the container, stress concentrates in the vicinity of the corners, the casing is buckled, and the container is deformed.
[0003]
At present, there is a tendency to reduce the weight of the container in consideration of environmental problems and the like, and therefore, the meat pressure of the container is inevitably reduced and the strength of the container is reduced.
[0004]
For this reason, it is necessary to fill the container with packaging contents, handling the container, handling containers when packing containers packed in cardboard, transporting, and handling during product display. When an external force is applied, the container may be deformed and the commercial value may be reduced.
[0005]
In Patent Document 1, in a plastic bottle in which a circumferential groove is formed in a rectangular tube-shaped body portion, the depth of the circumferential groove is a uniform depth in the panel wall portion, and the depth in the panel wall portion is 0 to 0 in the corner portion. By forming the groove to a depth of 4/5 times and forming the width of the circumferential groove the same over the entire circumference of the body, stress concentration is less likely to occur, resistance to deformation is increased, and compressive strength is improved. Are listed.
[0006]
[Patent Document 1]
Japanese Utility Model Publication No. 7-51460 [0007]
[Problems to be solved by the invention]
However, the configuration of the container described in Patent Document 1 cannot be said to have sufficient rigidity when a side pressure is applied to the body of the container, so that deformation may occur.
[0008]
An object of the present invention is to provide a rigid resin casing which prevents deformation due to a vertical load and a lateral pressure applied to the container during the filling process of the contents into the container, storage, and the like.
[0009]
[Means for Solving the Problems]
The invention according to claim 1 solves the above-mentioned problem, and has an annular concave rib that has a polygonal body part composed of a planar wall part and a corner part, and is recessed from the outer peripheral surface of the container in the vicinity of the center part of the body part. The ring-shaped recessed rib has a first recessed portion corresponding to a region near the center of the plane wall portion and a shallower portion of the first recessed portion than the first recessed portion. More than the second recessed portion that is continuous with the second recessed portion that is formed corresponding to the corner portion and the second recessed portion that is continuous at both ends via the inclined surface-shaped or curved surface-shaped transition portion. The gist is a synthetic resin casing characterized by having a shallow third recess.
[0010]
According to the first aspect of the present invention, the annular recessed rib includes a first recessed portion corresponding to a region near the center of the plane wall portion and both ends of the first recessed portion that are shallower than the first recessed portion. Than the second recessed portion that is formed in correspondence with the corner portion and the second recessed portion that is formed corresponding to the corner portion. Since the shallow third concave portion is provided, when a vertical load is applied to the housing, the first concave portion and the second concave portion are elastically deformed to absorb a part of the vertical load. On the other hand, the shallowest third recessed portion is less likely to be elastically deformed than the first and second recessed portions, and as a result, the deformation of the entire annular recessed rib is not increased. Durability against vertical load is mainly given. Moreover, not only a high buckling strength can be obtained by these two actions, but also the first recessed portion protruding inward of the container gives the container a high internal pressure resistance, so that it can be contained in the decompression or hot warmer after hot pack filling. When a product is displayed and heated for sale, excellent internal pressure resistance is exhibited against an increase in pressure in the container.
[0011]
The invention according to claim 2 solves the above-mentioned problem, and has an annular concave rib that has a polygonal body part composed of a flat wall part and a corner part and is recessed from the outer peripheral surface of the container in the vicinity of the center part of the body part. A synthetic resin casing having a corner concave rib having a shape in which the central portion in the circumferential direction of the corner is the most recessed at the corner of the upper and lower polygonal barrels divided by the annular concave rib. A gist is a synthetic resin casing characterized by comprising.
[0012]
According to invention of Claim 2, rigidity and internal pressure resistance are provided to a corner part by a corner part recessed part, and it has high buckling strength compared with the conventional container, and after hot pack filling It is possible to provide a synthetic resin casing that exhibits excellent internal pressure resistance against an increase in pressure in a container when products are displayed in a reduced pressure or hot warmer for warm sales.
[0013]
The invention according to claim 3 solves the above-mentioned problem, and the annular recessed rib is shallower than the first recessed portion and the first recessed portion corresponding to the region near the center of the plane wall portion, A second concave portion that is continuous at both ends of the first concave portion via an inclined or curved transition portion, and a second concave portion that is formed corresponding to the corner portion, The gist of the synthetic resin casing according to claim 2, further comprising a third concave portion shallower than the second concave portion.
[0014]
According to the invention described in claim 3, in addition to the effects of the invention described in claim 1, the corner portion is provided with rigidity and internal pressure resistance by the corner portion recessed portion, and the conventional container is provided. In addition to having a high buckling strength compared to, a composition that exhibits excellent internal pressure resistance against pressure increase in containers when displaying hot products under reduced pressure after hot pack filling or hot warmers A resin casing can be provided.
[0015]
The invention according to claim 4 solves the above-mentioned problem, and has an annular concave rib that has a polygonal body part composed of a flat wall part and a corner part and is recessed from the outer peripheral surface of the container in the vicinity of the center part of the body part. A synthetic resin casing having a rectangular pyramid-shaped recessed rib at a corner portion of the shoulder portion of the casing and / or a corner portion of the peripheral wall of the bottom portion of the casing. .
[0016]
According to the invention described in claim 4, the square pyramidal concave ribs impart rigidity and internal pressure resistance to the corners of the chassis shoulder and / or the corners of the peripheral wall of the chassis bottom, compared to conventional containers. Highly buckling strength and synthetic resin rivets exhibiting excellent internal pressure resistance against increased pressure in the container when the product is displayed in a hot-warmer under reduced pressure after hot-packing or hot-warmer The body can be provided.
[0017]
The invention according to claim 5 solves the above-mentioned problem, and the annular recessed rib is shallower than the first recessed portion and the first recessed portion corresponding to the region near the center of the plane wall portion, A second concave portion that is continuous at both ends of the first concave portion via an inclined or curved transition portion, and a second concave portion that is formed corresponding to the corner portion, The gist of the synthetic resin casing according to claim 4, further comprising a third recessed portion shallower than the second recessed portion.
[0018]
According to the invention described in claim 5, in addition to the effects of the invention described in claim 1, the corners of the shoulders of the chassis and / or the corners of the peripheral wall of the chassis bottom are formed by the quadrangular pyramidal concave ribs. In addition to having high buckling strength compared to conventional containers, the pressure inside the container is reduced when the hot pack is filled or when the product is displayed in the hot warmer for warm sales. It is possible to provide a synthetic resin casing exhibiting excellent internal pressure resistance against an increase in the temperature.
[0019]
Invention of Claim 6 solves said subject, The shape where the circumferential direction center part of this corner part was most dented in the corner part of the upper and lower polygonal trunk parts divided | segmented by the annular recessed rib The synthetic resin casing according to claim 5, wherein the synthetic resin casing is provided.
[0020]
According to the sixth aspect of the present invention, the effects of the first and second aspects of the present invention can be achieved, and the body shoulder corner and / or the body bottom can be formed by the quadrangular pyramidal concave rib. When rigidity and internal pressure resistance are added to the corners of the peripheral wall, the buckling strength is higher than that of conventional containers, and when products are displayed and heated in a vacuum or hot warmer after hot pack filling A synthetic resin casing having excellent internal pressure resistance against an increase in pressure inside the container can be provided.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
1A to 1C show a synthetic resin casing according to an embodiment of the first invention. FIG. 1A is a side view, and FIG. 1B is a DD line shown in FIG. An arrow sectional view and (C) are top views. FIG. 2 is a view as seen in the direction of A-C shown in FIG. FIG. 3 is a side view seen from the corner of the synthetic resin casing shown in FIG.
[0022]
The synthetic resin casing of the first invention is a biaxially stretched blow molded article made of synthetic resin such as polyethylene terephthalate, polypropylene, etc., and is a polygonal body comprising flat wall portions 6a, 6b and corner portions 7a, 7b. And a synthetic resin casing having an annular recessed rib 1 recessed from the outer peripheral surface of the container in the vicinity of the center of the trunk. The annular recessed rib 1 includes a first recessed portion 2 corresponding to a region near the center of the flat wall portion, and a shallow surface or a slanted surface at both ends of each first recessed portion 2, which is shallower than the first recessed portion 2. A second recessed portion 4 continuous via the curved surface-shaped transition portion 3a and a second recessed portion 4 formed corresponding to the corner portions 7a and 7b are inclined or curved surface-shaped transition portions 3b. And a third recessed portion 5 that is shallower than the second recessed portion 4. That is, the depth of the first concave portion 2 from the outer peripheral surface of the housing is L1, the depth of the second concave portion 4 from the outer peripheral surface of the housing is L2, and the outer peripheral surface of the third concave portion 5 is from the outer peripheral surface of the housing. If the depth of L is L3, then L1>L2> L3.
[0023]
Further, the above-mentioned synthetic resin casing is provided with a panel portion composed of laterally protruding ribs 10 and longitudinally protruding ribs 11 on the upper and lower planar wall portions 6a and 6b, and the upper planar wall portion 6a has a flange. A laterally recessed rib 12 that is recessed inward of the body is provided, and rigidity is imparted to the planar wall portions 6a and 6b.
[0024]
In the synthetic resin casing of the first invention, the annular recessed rib 1 has a first recessed portion shallower than the first recessed portion 2 and the first recessed portion 2 corresponding to the region near the center of the plane wall portion. Inclined to the second recessed portion 4 formed corresponding to the second recessed portion 4 and the corner portions 7a and 7b, which are continuous to each other through the inclined surface-shaped or curved surface-shaped transition portion 3a. Since the third concave portion 5 is shallower than the second concave portion 4 and continues through the planar or curved transition portion 3b, the first concave portion is applied when a vertical load is applied to the housing. The part 2 and the second recessed part 4 are elastically deformed to absorb a part of the vertical load. On the other hand, the shallowest third recessed portion 5 is less susceptible to elastic deformation than the first recessed portion 2 and the second both recessed portions 4, and as a result, the deformation of the entire annular recessed rib 1 does not increase. The durability against a vertical load is mainly given by the third recessed portion 5. Moreover, not only a high buckling strength can be obtained by these two actions, but also the first recessed portion 2 protruding toward the inside of the casing gives the container high internal pressure resistance, and the reduced pressure after filling the hot pack or inside the hot warmer When exhibiting products on the market and selling them warm, excellent internal pressure resistance can be achieved against an increase in pressure inside the housing.
[0025]
4A to 4C show a synthetic resin casing according to the embodiment of the second invention, wherein FIG. 4A is a side view and FIG. 4B is a DD line shown in FIG. An arrow sectional view and (C) are top views. FIG. 5 is a view in the direction of A-C shown in FIG. 6 is a side view seen from the corner of the synthetic resin casing shown in FIG.
[0026]
The synthetic resin casing of the second invention has a polygonal body portion composed of flat wall portions 6a, 6b and corner portions 7a, 7b, and an annular recessed rib that is recessed from the outer peripheral surface of the container in the vicinity of the center portion of the body portion. 1 is a shape in which the central portions in the circumferential direction of the corner portions 7a, 7b are most recessed in the corner portions 7a, 7b of the upper and lower polygonal body portions divided by the annular recessed rib 1. It is characterized by comprising the corner part recessed rib 13 of this.
[0027]
The synthetic resin casing of the second invention is provided with rigidity and internal pressure resistance to the corner portions 7a and 7b by the corner recess ribs 13 and has a higher buckling strength than conventional containers. Excellent internal pressure resistance against the increase in pressure in the container when the product is displayed in the hot-warmer under reduced pressure after hot-pack filling or hot-warmer.
[0028]
In the embodiment of the second invention, the annular recessed rib 1 may be an annular recessed rib formed at an equal depth over the entire circumference as in a conventional housing. However, the annular recessed rib 1 includes a first recessed portion 2 having a depth L1 corresponding to a region near the center of the planar wall portion, and both ends of each first recessed portion 2 shallower than the first recessed portion 2. Inclined into a second recessed portion 4 having a depth L2 and a second recessed portion 4 formed corresponding to the corner portions 7a and 7b through the inclined surface-shaped or curved surface-shaped transition portion 3a. The one provided with the third concave portion 5 having a depth L3 shallower than the second concave portion 4 and continuing through the surface or curved transition portion 3b includes the corner concave rib 13 and the annular concave rib 1. This is desirable because a higher buckling strength can be obtained by the synergistic action.
[0029]
FIGS. 7A to 7C show a synthetic resin casing according to an embodiment of the third invention. FIG. 7A is a side view, and FIG. 7B is a DD line shown in FIG. An arrow sectional view and (C) are top views. FIG. 8 is a view seen in the direction of line A-C shown in FIG. 9 is a side view seen from the corner of the synthetic resin casing shown in FIG.
[0030]
The synthetic resin casing of the third embodiment of the present invention has a polygonal body composed of flat wall portions 6a and 6b and corner portions 7a and 7b, and is recessed from the outer peripheral surface of the container in the vicinity of the center of the body. The synthetic resin housing having the annular recessed rib 1 is characterized by having quadrangular pyramidal recessed ribs 14 and 15 at the housing shoulder corner 8 and the housing bottom peripheral wall corner 9, respectively. is there.
[0031]
Note that the quadrangular pyramidal depressions may be configured to be provided only in either the chassis shoulder corner 8 or the chassis peripheral wall corner 9.
[0032]
The synthetic resin casing of the third embodiment is provided with rigidity and internal pressure resistance at the corners of the shoulders of the chassis and / or the corners of the bottom of the chassis by the pyramidal concave ribs. In addition to having high buckling strength compared to containers, it exhibits excellent internal pressure resistance against increased pressure in the container when it is heated and sold under reduced pressure after hot pack filling or in a hot warmer .
[0033]
In the embodiment of the third invention, the annular recessed rib 1 may be an annular recessed rib formed at an equal depth over the entire circumference as in a conventional housing. However, the annular recessed rib 1 includes a first recessed portion 2 having a depth L1 corresponding to a region near the center of the planar wall portion, and both ends of each first recessed portion 2 shallower than the first recessed portion 2. Inclined into a second recessed portion 4 having a depth L2 and a second recessed portion 4 formed corresponding to the corner portions 7a and 7b through the inclined surface-shaped or curved surface-shaped transition portion 3a. The one provided with the third concave portion 5 having a depth L3 shallower than the second concave portion 4 and continuing through the surface or curved transition portion 3b includes the corner concave rib 13 and the annular concave rib 1. This is desirable because a higher buckling strength can be obtained by the synergistic action.
[0034]
FIGS. 10A to 10C show a synthetic resin casing according to an embodiment of the fourth invention. FIG. 10A is a side view, and FIG. 10B is a DD line shown in FIG. An arrow sectional view and (C) are top views. FIG. 11 is a view as seen in the direction of line A-C shown in FIG. 12 is a side view seen from the corner of the synthetic resin casing shown in FIG.
[0035]
The synthetic resin casing of the fourth aspect of the invention has a polygonal body made up of flat wall portions 6a, 6b and corner portions 7a, 7b, and is recessed from the outer peripheral surface of the container in the vicinity of the center of the body. In the synthetic resin housing having the annular recess rib 1, the housing shoulder corner portion 8 and the housing bottom peripheral wall corner portion 9 have quadrangular pyramid recess ribs 14 and 15, respectively, and the annular recess rib 1 The corner portions 7a and 7b of the upper and lower polygonal body portions divided by the above are provided with the corner portion recessed ribs 13 having a shape in which the center portion in the circumferential direction of the corner portions 7a and 7b is most recessed. Is.
[0036]
In the embodiment of the fourth invention, the annular recessed rib 1 may be an annular recessed rib formed at an equal depth over the entire circumference as in a conventional housing. However, the annular recessed rib 1 includes a first recessed portion 2 having a depth L1 corresponding to a region near the center of the planar wall portion, and both ends of each first recessed portion 2 shallower than the first recessed portion 2. Inclined into a second recessed portion 4 having a depth L2 and a second recessed portion 4 formed corresponding to the corner portions 7a and 7b through the inclined surface-shaped or curved surface-shaped transition portion 3a. The one having the third concave portion 5 having a depth L3 shallower than the second concave portion 4 and continuing through the transition portion 3b having a surface or curved surface is provided with the quadrangular pyramid concave ribs 14 and 15 and the corner angle. It is desirable because a higher buckling strength can be obtained by the synergistic action of the partial concave rib 13 and the annular concave rib 1.
[0037]
【Example】
(Example 1)
As shown in FIGS. 1 (A) to 1 (C), it has a polygonal body portion composed of flat wall portions 6a and 6b and corner portions 7a and 7b, and has an annular shape recessed from the outer peripheral surface of the container in the vicinity of the center portion of the body portion. In the synthetic resin casing having the recessed rib 1, the annular recessed rib 1 includes a first recessed portion 2 corresponding to a region near the center of the plane wall portion, and a first recessed portion shallower than the first recessed portion 2. A second recessed portion 4 continuous to both ends of the portion 2 via an inclined surface-shaped or curved surface-shaped transition portion 3a, and a second recessed portion 4 formed corresponding to the corner portion, A synthetic resin casing having a third concave portion 5 shallower than the two concave portions 4 was produced.
[0038]
A buckling strength was measured by applying a vertical load to the housing. As a result, buckling occurred at the shoulder when the vertical load was 255N. This buckling strength is higher than the buckling strength 200N measured for the conventional case shown in the following comparative example, and it was found that the strength is increased by providing the annular recessed rib 1 as described above. .
[0039]
(Example 2)
As shown in FIG. 4 (A), it has a polygonal body part composed of flat wall parts 6a, 6b and corner parts 7a, 7b, and has an annular recessed rib that is recessed from the outer peripheral surface of the container in the vicinity of the center part of the body part. In the synthetic resin casing, the corners of the shape of the corners 7a, 7b of the upper and lower polygonal barrels divided by the annular recess ribs are the most concave in the circumferential center of these corners 7a, 7b. A synthetic resin casing having an indented rib 13 and an annular recessed rib having an equal depth over the entire circumference as in the conventional casing was produced.
[0040]
A buckling strength was measured by applying a vertical load to the housing. As a result, when the vertical load was 220 N, buckling occurred at the corners of the annular recessed rib. This buckling strength is higher than the buckling strength 200N measured for the conventional case shown in the following comparative example, and the strength can be increased by providing the corner recess rib 13 as described above. all right.
[0041]
Example 3
As shown in FIG. 7 (A), it has a polygonal body part composed of flat wall parts 6a, 6b and corner parts 7a, 7b, and has an annular recessed rib recessed from the outer peripheral surface of the container in the vicinity of the center part of the body part. The synthetic resin housing has quadrangular pyramid-shaped recessed ribs 14 and 15 at the housing shoulder corner 8 and the housing bottom peripheral wall corner 9 respectively, and the annular recessed rib is entirely as in the conventional housing. A synthetic resin casing which is an annular recessed rib having an equal depth over the circumference was produced.
[0042]
A buckling strength was measured by applying a vertical load to the housing. As a result, when the vertical load was 230 N, buckling occurred at the corners of the annular recess. This buckling strength is higher than the buckling strength 200N measured for the conventional case shown in the following comparative example, and the strength is increased by providing the quadrangular pyramid recessed ribs 14 and 15 as described above. I understood.
[0043]
(Example 4)
As shown in FIGS. 10 (A) to 10 (C), it has a polygonal body part composed of flat wall parts 6a, 6b and corner parts 7a, 7b, and has an annular shape recessed from the outer peripheral surface of the container near the center part of the body part. In the synthetic resin casing having concave ribs, the corner portions 7a and 7b of the upper and lower polygonal barrels divided by the annular concave ribs are the most concave in the circumferential center of the corner portions 7a and 7b. Are provided on the body shoulder corner 8 and the bottom wall peripheral wall corner 9 with quadrangular pyramid-shaped recessed ribs 14 and 15, respectively. A first recessed portion 2 corresponding to a region in the vicinity of the center of the first portion, and a shallower portion than the first recessed portion 2, and continuous to both ends of the first recessed portion 2 via an inclined surface-shaped or curved surface-shaped transition portion 3a. From the second recessed portion 4 that is continuous with the second recessed portion 4 and the second recessed portion 4 formed corresponding to the corner portion. To prepare a shallow third synthetic resin bottle body with a concave portion 5 of the.
[0044]
A buckling strength was measured by applying a vertical load to the housing. As a result, when the vertical load was 320 N, buckling occurred at the corners of the annular recess. This buckling strength is higher than the buckling strength 200N measured for the conventional case shown in the following comparative example. As described above, the corner concave ribs, the quadrangular pyramid concave ribs 14, 15 and the annular concave ribs are used. It was found that the strength was increased by providing 1.
[0045]
(Comparative example)
As in the first embodiment, as shown in FIG. 1 (A), it has a polygonal body made up of flat wall portions 6a and 6b and corner portions 7a and 7b, and is recessed from the outer peripheral surface of the container near the center of the body. An annular recess rib 1 was provided, but the annular recess rib 1 was a conventional synthetic resin casing which is an annular recess rib having an equal depth over the entire circumference as in the conventional casing.
[0046]
A buckling strength was measured by applying a vertical load to the housing. As a result, when the vertical load was 200 N, buckling occurred at the corners of the annular recess.
[0047]
As is clear from Examples 1 to 4 and Comparative Example extended as described above,
(1) In a synthetic resin casing having a polygonal body part composed of a flat wall part and a corner part and having an annular recessed rib recessed from the outer peripheral surface of the container in the vicinity of the central part of the body part, A first concave portion corresponding to a region near the center of the plane wall portion and a shallower portion than the first concave portion, and continuous with both ends of the first concave portion via a transition portion having an inclined surface shape or a curved surface shape. By providing a second concave portion and a third concave portion that is formed corresponding to the corner portion and is continuous with the second concave portion and shallower than the second concave portion, or
(2) In a synthetic resin casing having a polygonal body part composed of a flat wall part and a corner part and having an annular recessed rib recessed from the outer peripheral surface of the container in the vicinity of the center part of the body part, it is divided by the annular recessed rib. By providing a corner recess concave rib having a shape in which the central portion in the circumferential direction of the corner is the most recessed at the corner of the upper and lower polygonal barrels, or
(3) In a synthetic resin case having a polygonal body part composed of a flat wall part and a corner part and having an annular recessed rib recessed from the outer peripheral surface of the container in the vicinity of the center part of the body part, By providing a quadrangular pyramid-shaped recessed rib at the corner of the wall and / or the bottom of the casing, or
(4) The structure of the synthetic resin casing having a polygonal body portion composed of a flat wall portion and a corner portion, and having an annular recessed rib recessed from the outer peripheral surface of the container in the vicinity of the center portion of the body portion (1) (2) (3) By including all the configurations,
A synthetic resin casing having higher buckling strength can be obtained as compared with a conventional synthetic resin casing.
[0048]
【The invention's effect】
As described above in detail, according to the invention described in claims 1 to 6, not only has a high buckling strength compared to a conventional container, but also in a reduced pressure or hot warmer after hot pack filling. It is possible to provide a synthetic resin casing that exhibits excellent internal pressure resistance against an increase in pressure in a container when products are displayed and heated.
[Brief description of the drawings]
1A and 1B show a synthetic resin casing according to an embodiment of the first invention, in which FIG. 1A is a side view, FIG. 1B is a cross-sectional view taken along line DD in FIG. ) Is a top view.
FIG. 2 is a view seen in the direction of A-C shown in FIG.
FIG. 3 is a side view of the synthetic resin casing shown in FIG. 1 as viewed from the corner.
4A and 4B show a synthetic resin casing according to an embodiment of the second invention, in which FIG. 4A is a side view, FIG. 4B is a cross-sectional view taken along line DD in FIG. ) Is a top view.
5 is a view as seen in the direction of AC in FIG. 4C. FIG.
6 is a side view seen from the corner of the synthetic resin casing shown in FIG. 4. FIG.
7A and 7B show a synthetic resin casing according to an embodiment of the third invention, in which FIG. 7A is a side view, FIG. 7B is a cross-sectional view taken along line DD in FIG. ) Is a top view.
8 is a view as seen in the direction of AC in FIG. 7C. FIG.
9 is a side view seen from the corner of the synthetic resin casing shown in FIG. 7. FIG.
10A and 10B show a synthetic resin casing according to an embodiment of the fourth invention, in which FIG. 10A is a side view, FIG. 10B is a cross-sectional view taken along line DD in FIG. ) Is a top view.
FIG. 11 is a view seen in the direction of A-C shown in FIG.
12 is a side view seen from the corner of the synthetic resin casing shown in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Annular recessed rib 2 1st recessed part 3a Transition part 3b Transition part 4 2nd recessed part 5 3rd recessed part 6a, 6b Planar wall part 7a, 7b Corner part 8 Body shoulder part Corner part 9 Body bottom peripheral corner 10 Horizontal projecting rib 11 Vertical projecting rib 12 Lateral recessed rib 13 Corner recessed rib 14 Square pyramidal recessed rib 15 Square pyramidal recessed rib L1 Depth of first recessed section L2 Depth of second recess L3 Depth of third recess

Claims

A synthetic resin casing having a polygonal body part composed of a flat wall part and a corner part, and having an annular recessed rib recessed from the outer peripheral surface of the container in the vicinity of the central part of the body part. A first concave portion corresponding to a region near the center of the wall portion and a first shallow concave portion that is shallower than the first concave portion and is continuous with both ends of the first concave portion via an inclined surface-shaped or curved surface-shaped transition portion. 2, and a third concave portion that is formed corresponding to the corner portion and that is continuous with the second concave portion and is shallower than the second concave portion. body.

This is a synthetic resin casing having a polygonal body part composed of a flat wall part and a corner part, and having an annular recessed rib recessed from the outer peripheral surface of the container in the vicinity of the central part of the body part, divided by the annular recessed rib. A synthetic resin casing comprising a corner-recessed rib having a shape in which the central portion in the circumferential direction of the corner is recessed most at the corner of the upper and lower polygonal barrels.

The annular recessed rib includes a first recessed portion corresponding to a region near the center of the plane wall portion, and a shallower than the first recessed portion, and a transition portion having an inclined surface shape or a curved surface shape at both ends of the first recessed portion. And a second recessed portion that is formed in correspondence with the corner portion and that is continuous with the second recessed portion and is shallower than the second recessed portion. The synthetic resin casing according to claim 2.

A synthetic resin case having a polygonal body part composed of a flat wall part and a corner part, and having an annular recessed rib recessed from the outer peripheral surface of the container in the vicinity of the center part of the body part. And / or having a quadrangular pyramid-shaped recessed rib at the corner of the peripheral wall of the bottom of the casing.

The annular recessed rib includes a first recessed portion corresponding to a region near the center of the plane wall portion, and a shallower than the first recessed portion, and a transition portion having an inclined surface shape or a curved surface shape at both ends of the first recessed portion. And a second recessed portion that is formed in correspondence with the corner portion and that is continuous with the second recessed portion and is shallower than the second recessed portion. The synthetic resin casing according to claim 4.

6. The corner recesses of the upper and lower polygonal bodies divided by the annular recess ribs are provided with corner recess recesses having a shape in which the central portion in the circumferential direction of the corners is most recessed. Synthetic resin housing.