JP2004026305A

JP2004026305A - Drinking water storage vessel

Info

Publication number: JP2004026305A
Application number: JP2003066357A
Authority: JP
Inventors: Jun Mochizuki; 望月　純; Kazuo Yamamoto; 山本　和夫
Original assignee: Daiwa Can Co Ltd
Current assignee: Daiwa Can Co Ltd
Priority date: 2002-04-30
Filing date: 2003-03-12
Publication date: 2004-01-29

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drinking water storage vessel capable of being held with a bare hand under its heated state without bringing about substantially increased costs and at the same time capable of reducing an amount of produced dew when the vessel is held at a room temperature under its cooled state. <P>SOLUTION: There is provided a drinking water storage vessel in which a vessel body 1 is formed into a cylindrical shape with metals such as aluminum or steel and the like. Many grooves 2 are arranged side-by-side at the surface of a barrel 11 of the vessel body 1 with a circumferential predetermined spacing. A heat shrinkage resin film 3 is thermally shrunk at the outer surface of the barrel and the heat shrinkage resin film 3 is abutted against and supported at each of protrusions 21 constituted by many grooves 2 and a hollow part 4 is formed between respective notches 22 and the heat shrinkage resin film 3, and then the grooves 2 are formed such that an area of the part where the heat shrinkage resin film 3 abuts against each of the protrusions 21 may become smaller than a projected area of a non-contact part against the surface of the film 3. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、特に加温状態で販売されるコーヒー、紅茶、ココア等の飲料水を収容する金属製の飲料水収容容器の改良に関する。
【０００２】
【従来の技術】
従来のこの種の飲料水収容容器としては、例えば、特開２００１−４８２４９号公報に記載のものが知られている。この従来例の飲料水収容容器は、プラスチック製のボトルと、該ボトルを覆う断熱シートと、キャップからなる飲料水用容器であって、該ボトルのボディ部に複数の凹部および／または凸部が設けられており、さらに、前記断熱シートによって少なくともボディ部が覆われている構成としたものであった。
従来例では、上述のように複数の凹部および／または凸部が設けられたボトルのボディ部を断熱シートで覆った状態とすることにより、断熱シートによる断熱性に加え、ボトルと断熱シートとの間に空気の領域を設けることによって、容器の断熱性を一段と向上させ、これにより、冷却もしくは加温された飲料水の保冷、保温効果を高めることができるようにしたものであった。
【０００３】
【発明が解決しようとする課題】
従来例の飲料水収容容器は、上述のように、プラスチックボトルを対象としており、ボトル自体の熱伝導率が小さいため、加温した状態でも素手で保持することが可能であるが、一度に飲みきれない容量のボトルにおいて、冷却もしくは加温された飲料水の保冷、保温効果を高めるために、ボトルのボディ部に複数の凹部および／または凸部を設け、その外面を断熱シートで覆って空気の領域を設けた構成としたものである。
【０００４】
しかしながら、スチール、アルミニウム等の金属製飲料水収容容器にあっては、プラスチック等の合成樹脂製飲料水収容容器に比べて熱伝導率が大きいため、加温されたホット状態のものにあっては、素手で保持することができない場合がある。また、商品内容を示す印刷を施したフィルムにより、金属製容器の外面を覆うことがあるが、このようなフィルムは通常、断熱性が小さい。そのため、このように構成しても、素手で保持できない場合がある。金属缶の場合、表面温度が、５５℃を越えると、素手で保持する際に、個人差はあるものの、ほとんどの人が熱さを感じて缶を保持することができなくなる。そこで、従来例のように、容器の外面に特殊な加工を施したりフィルムの厚さを肉厚とした断熱シートで容器の外面を覆っておくことにより、素手で保持できるようにはなるが、断熱シートの追加は容器としてのコストを大幅にアップさせることになる。
【０００５】
また、冷却された状態のものにあっては、室温で保持した場合に、結露が生じる問題がある。冷蔵庫などで冷却した容器を室温に保持すると、表面に結露を生じ、容器表面の水滴が周囲の物に付着したり、容器を手で保持する場合に、手が濡れたり、容器が滑り易くなって保持しにくくなる不具合が生じる。この問題は、合成樹脂製の容器でも生じるが、熱伝導率の大きな金属容器にあっては、より顕著になる。
【０００６】
本発明は、上述の従来の問題点に着目してなされたもので、大幅なコストアップを招くことなしに熱めに加温された状態のものを素手で保持することができると共に、冷却された状態においては、室温で保持した際の結露量を減少させることができる金属製の飲料水収容容器を提供することを目的とするものである。
【０００７】
【課題を解決するための手段】
上述の目的を達成するために、本発明請求項１記載の飲料水収容容器は、少なくとも容器本体部が金属製で略筒状に形成された胴部を有する飲料水収容容器であって、前記筒状容器本体部の表面に凹部および／または凸部が形成され、前記筒状容器本体部の外面にフィルムを被せることにより、前記凹部および／または凸部で構成される保持部表面の凸部にフィルムを当接支持させて各凸部とフィルムとの間に中空部が形成され、前記保持部において、前記フィルムが各凸部と当接する部分の面積が、非当接部分のフィルム面に対する投影面積よりも狭くなるように前記凹部および／または凸部が形成されていることを特徴とする。
【０００８】
本発明請求項２記載の飲料水収容容器は、請求項１記載の飲料水収容容器において、前記フィルムが各凸部と当接する部分の面積が、フィルムが各凸部と当接する部分の面積と、非当接部分のフィルム面に対する投影面積を合計した面積の２０％以下となるように前記凹部および／または凸部が形成されていることを特徴とする。
【０００９】
本発明請求項３記載の飲料水収容容器は、請求項１または２に記載の飲料水収容容器において、前記凹部および／または凸部が突条および／または溝として形成され、前記フィルムが特定の一方向に延伸された熱収縮性を有するフィルムであり、前記フィルムの延伸方向が前記突条および／または溝の形成されている方向に直交するように前記フィルムが被せられていることを特徴とする。
【００１０】
本発明請求項４記載の飲料水収容容器は、請求項１〜３のいずれかに記載の飲料水収容容器において、前記凹部および／または凸部が、前記筒状容器本体部の円周方向線および該円周方向線と直交する方向線の両方向線に対し所定の角度を持つように傾斜状に形成されていることを特徴とする。
【００１１】
本発明請求項５記載の飲料水収容容器は、請求項１〜４のいずれかに記載の飲料水収容容器において、予め外面に所定の印刷が施された状態の前記筒状容器本体部に前記凹部および／または凸部が形成され、その外面に被せる前記フィルムの少なくとも一部が透明体であることを特徴とする。
【００１２】
【発明の作用および効果】
この発明請求項１記載の飲料水収容容器では、上述のように、金属製の飲料水収容容器における筒状容器本体部の表面に凹部および／または凸部が形成されると共に、その外面に被せたフィルムのうち、前記多数の凹部および／または凸部で構成された各凸部と当接する部分の面積が、非当接部分のフィルム面に対する投影面積よりも狭くなるように前記凹部および／または凸部が形成されることにより、熱めに加温された状態の容器を素手でもった場合、前記各凸部のうち、フィルムが当接する部分の面積がフィルムを介して手に接触する部分となり、それ以外の非当接部分は、各凹部とフィルムとの間に中空部が形成される。
【００１３】
従って、容器本体の凸部のうち、手に接触する部分の割合が少なく、かつ、各凸部とはフィルムを介して接触することで手への熱の伝導が緩和され、これにより、熱めに加温された状態の容器でも素手で保持することができるようになるという効果が得られる。同様に、冷却された場合にあっては、フィルムが周囲の空気と接触する時、凸部に接触している部分のみが結露を生じ、凹部の間に中空部が形成されている領域には結露を生じることがないため、容器に付着する結露の量を低減させる効果が得られる。
また、フィルムは保温を目的とするものではなく、商品内容を示すラベルとして用いるものであるため、保温を目的とするため肉厚だったり特殊加工を要する断熱シートに比べて安価であり、従って、大幅なコストアップを招くこともない。
【００１４】
本発明請求項２記載の飲料水収容容器では、上述のように、前記フィルムが各凸部と当接する部分の面積が、前記フィルムが各凸部と当接する部分の面積と、非当接部分のフィルム面に対する投影面積を合計した面積の２０％以下となるように前記凹部および／または凸部が形成されることにより、熱めに加温された状態の容器を素手でもった場合、前記各凸部のうち、フィルムが当接する部分の面積がフィルムを介して手に接触する部分となり、それ以外の非当接部分は、各凹部とフィルムとの間に中空部が形成される。
【００１５】
従って、筒状容器本体部の凸部のうち、手に接触する部分の割合が極めて少なく、かつ、各凸部とはフィルムを介して接触することで手への熱の伝導が大幅に緩和され、これにより、熱めに加温された状態の容器でも素手で容易に保持することができるようになるという効果が得られる。同様に、冷却された場合にあっては、フィルムが周囲の空気と接触する時、フィルムと凸部が接触している部分の割合が少なく、従って、フィルム表面において結露を生じる部分の割合が小さいため、容器に付着する結露の量を大幅に低減させることができるようになるという効果が得られる。
また、フィルム表面が円筒面とは異なる表面（多面体状の表面等）を構成することで、筒状容器本体部の表面が鏡面のように光りを反射するので、これにより、美粧性が高まって、より客の目を引く容器となる。
【００１６】
請求項３記載の飲料水収容容器では、上述のように、前記フィルムが特定の一方向に延伸された熱収縮性を有するフィルムであり、前記フィルムの延伸方向が前記突条もしくは溝の形成されている方向に直交するようにフィルムが被せられている構成としたことで、フィルムとして熱収縮性を有するフィルムを用いた場合でも、凹部とフィルムとの間に中空部を形成することができる。即ち、特定の一定方向に延伸された熱収縮性を有するフィルムは、加熱された際に、延伸方向には非常に大きく収縮するが延伸方向に直交する方向には僅かしか収縮しない。例えば、ポリエステル、ポリエチレン等の樹脂で上述のような延伸フィルムを作成すると、その延伸方向における収縮率（収縮前後のフィルム長さの差／収縮前のフィルム長さ）が７０％〜８０％であるのに対し、延伸方向に直交する方向の収縮率はそれと比較して非常に小さい。従って、該フィルムの延伸方向が、突条もしくは溝の形成されている方向に直交するように、筒状容器本体部に該フィルムを装着した状態で熱風を吹き付けてフィルムを加熱すると、該熱収縮性を有するフィルムが突条もしくは溝の形成されている方向と直交する方向に収縮することで、多数の突条もしくは溝で構成される各凸部に熱収縮性を有するフィルムが当接支持され、熱収縮性を有するフィルムが隣接する両凸部間では直線状に張りつめられた状態となるもので、これにより、各凹部と熱収縮性を有するフィルムとの間に中空部を確実に形成することができる。
従って、中空部内に形成された空気層の断熱作用により、手への熱伝導を大幅に低減することができるようになる。
【００１７】
請求項４記載の飲料水収容容器では、上述のように、前記凹部および／または凸部が、前記筒状容器本体部の円周方向線および該円周方向線と直交する方向線の両方向線に対し所定の角度を持つように傾斜状に形成されているため、フィルムとして熱収縮性を有するフィルムを用いる場合に、延伸方向が円周方向または軸方向（円周方向に直交する方向）のいずれのフィルムであっても、凹部とフィルムとの間に中空部を形成することができる。即ち、各凹部および／または凸部が筒状容器本体部の円周方向線に沿って形成されていると、フィルムとして円周方向に延伸された熱収縮性を有するフィルムを用いた場合、熱収縮性を有するフィルムの収縮方向と各凹部の方向が一致するため、熱収縮性樹脂フィルムが凹部に沿って食い込んで空気層が形成されなくなるが、この請求項４におけるように各凹部および／または凸部が、少なくとも筒状容器本体部の円周方向線に対し所定の角度を持つように傾斜状に形成されることにより、隣接する両凸部で熱収縮性樹脂フィルムが支持された状態となるため、凹部とフィルムとの間に中空部を形成することができる。
【００１８】
請求項５記載の飲料水収容容器では、上述のように、予め外面に所定の印刷が施された状態の前記筒状容器本体部に前記突条もしくは溝が形成され、その外面に被せる前記フィルムの少なくとも一部が透明体で構成されているため、フィルムが多面体表面となり、筒状容器本体部の表面が鏡面のように光りを反射することにより美粧性が高まる効果に加えて、フィルムの透明部分では、見る角度により、光りの反射によって缶表面の印刷が見えたり見えなかったりする効果を生じ、より客の目を引く容器となる。
従って、飲料水の販売促進効果を高めることができるようになる。
【００１９】
【発明の実施の形態】
以下に、本発明の実施の形態を図面に基づいて説明する。
（発明の実施の形態１）
まず、本発明の実施の形態１の構成を図１に基づいて説明する。
図１は本発明の実施の形態１の飲料水収容容器を示す容器本体部分の一部切欠正面図、図２は図１のＩＩ−ＩＩ線における要部拡大断面図を示す。
【００２０】
これらの図に示すように、この発明の実施の形態１では、容器本体（筒状容器本体部）１部分がアルミニウム等の金属製薄板でボトル型に形成されている。即ち、容器本体１の胴部１１が有底円筒状に形成されていて、その上部には半球面状の肩部１２を介して飲み口を備えた小径の首部１３が一体に形成され、この首部１３には、図示を省略したねじ蓋を螺合するための雄ねじ山１４が形成されている。
【００２１】
前記容器本体１における胴部１１の外面には、該胴部１１の円周方向線に対し直角に交わる方向に延びる凹部２２を構成する多数の溝２が近接状に並設されることにより、隣接する両溝２−２間に凸部２２が形成され、これにより、胴部１１の円周方向線に沿って多数の凸部２１と凹部２２とが交互に配置された状態となっている。
【００２２】
前記多数の溝２で構成される凸部２１と凹部２２を含む胴部１１の外周面には、商品の内容等を表示するラベルを構成する熱収縮性樹脂フィルム（フィルム）３が取り付けられている。この熱収縮性樹脂フィルム３は、熱を加えることによってその表面積が収縮する性質を有するフィルムであり、ポリエステル、ポリスチレン等の熱収縮性樹脂により胴部１１よりは大径の円筒状に形成されていて、延伸方向である円周方向に大きく収縮するように構成されたものが用いられている。また、缶胴の外面において、凸部２１と凹部２２が形成された領域の上部および下部には、凹凸の形成されていない領域が存在しているが、この部分はフィルム３が外周に取り付けられた際に、缶胴との密着性を高める目的で設けられている。この領域の位置、形状は、缶体を凹凸が形成された部分で保持する際に、邪魔にならないようにすることが好ましい。
【００２３】
即ち、円筒状の熱収縮性樹脂フィルム３を容器本体１における胴部１１の外周に被せた状態で、熱風等で熱を加えることにより、熱収縮性樹脂フィルム３が円周方向に熱収縮して縮径され、各凸部２１に当接支持された状態で取り付けが行われるもので、この状態においては、隣接する両凸部２１−２１間では熱収縮性樹脂フィルム３が直線状に張りつめられた状態となっており、このため、熱収縮性樹脂フィルム３と各凹部２２との間には空気層を構成する中空部４が形成された状態となっている。
【００２４】
この中空部４は、胴部１１を素手で持った時に、手が直接接触する熱収縮性樹脂フィルム３と凹部２２との間を空気層を介して非接触状態とすることにより、加温された飲料水が収容された容器本体１の熱が手に直接伝わるのを阻止する役目をなすと共に、冷却された飲料水が収容された容器本体１によってフィルムの全面が直接冷却されることを防ぎ、これにより、結露の発生を大幅に抑制する役目をなすものである。
【００２５】
従って、前記熱収縮性樹脂フィルム３が各凸部２１と当接する部分の面積の割合が少なくともその他の非当接部分、即ち、前記中空部４の表面積よりは狭くなるように前記溝２の並設ピッチが設定されることが必要であり、好ましくは凸部２１と当接する部分の面積の割合が小さければ小さい程、手への熱の伝わり方を少なくすることができ、また、結露の量を減少させることができる。
【００２６】
なお、前記各溝２によって形成される両凸部２１−２１間のピッチＰは、凸部２１の半径と凹部２２の半径の差Ｄおよび各凹部２２の深さＨ（フィルム面と凹部２２との距離）との関係を考慮して設定される。即ち、前記Ｄの大きさが同一の場合、ピッチＰが大きくなるほど、前記Ｈの深さは小さくなり、ある大きさのピッチＰでフィルムは３は凹部２２に接触して、中空部４が形成されなくなってしまう。胴部１１の材質や板厚等との関係で、Ｄの大きさには限界があるため、熱収縮性樹脂フィルム３と各凹部２２との間に所定の中空部４を維持可能な深さＨを確保できる範囲においてピッチＰが設定される。そして、前記所定の中空部４とは、少なくとも手で握った時の押圧力では少なくとも熱収縮性樹脂フィルム３が凹部２２に接触する可能性のない程度の深さの中空部４である。
【００２７】
なお、前記各溝２によって形成される両凸部２１−２１間の並設ピッチＰが３．５ｍｍになると共に、その外面に厚み５０μｍのポリエステル製熱収縮性樹脂フィルム３を熱収縮により装着した状態で、該熱収縮性樹脂フィルム３が各凸部２１と当接する部分の幅Ｗが０．２５ｍｍ、各凹部２２の深さＨが０．２３ｍｍとなるように凸部２１と凹部２２の形状を設定した結果、良好な断熱効果が得られた。ちなみに、この例の場合は、缶胴の縦方向における溝２の長さが等しいので、熱収縮性樹脂フィルム３が各凸部２１と当接する部分の面席と、当接する部分の面積と非当接部分のフィルム面への投影面積を合計した面積との割合は、当接部分の幅ＷとピッチＰとの比に等しくなり、Ｗ：Ｐ＝０．２５：３．５に設定されたことになる。
【００２８】
次に、この発明の実施の形態１の作用・効果を説明する。
この発明の実施の形態１の飲料水収容容器では、上述のように構成されるため、熱めに加温された状態の容器本体１の胴部１１を素手でもった場合、前記各凸部２１のうち、熱収縮性樹脂フィルム３が当接する部分の面積（幅Ｗ）のみが熱収縮性樹脂フィルム３を介して手に接触し、それ以外の部分は、各凹部２２と熱収縮性樹脂フィルム３との間に形成された中空部４により胴部１１とは非接触状態の熱収縮性樹脂フィルム３が手に接触する状態となる。
【００２９】
従って、各凸部２１のうち、手に接触する部分の割合が少なく、かつ、各凸部２１とは熱収縮性樹脂フィルム３を介して間接的に接触することで手への熱の伝導が緩和され、これにより、飲料水が熱めに加温された状態でも熱伝導率の大きいアルミニウム製の胴部１１を素手で保持することができるようになるという効果が得られる。
【００３０】
また、熱収縮性樹脂フィルム３は保温を目的とするものではなく、商品内容を示すラベルとして用いるものであるため、保温を目的とするため肉厚だったり特殊加工を要する断熱シートに比べて安価であり、従って、大幅なコストアップを招くこともない。
【００３１】
また、前記溝２が、前記容器本体１の円周方向線に対し直角に交わる状態に形成されているため、フィルムとして円周方向に延伸されている熱収縮性樹脂フィルム３を用いた場合でも、凹部２２と熱収縮性樹脂フィルム３との間に中空部４を形成することができる。即ち、熱収縮性樹脂フィルム３に熱風等を吹き付けると、該熱収縮性樹脂フィルム３がその延伸方向である円周方向に収縮し、多数の溝２で構成される各凸部２１に熱収縮性樹脂フィルム３が当接支持されることで、熱収縮性樹脂フィルム３が隣接する両凸部２１−２１間では直線状に張りつめられた状態となるもので、これにより、各凹部２２と熱収縮性樹脂フィルム３との間に中空部４を確実に形成することができる。
従って、中空部４内に形成された空気層の断熱作用により、手への熱伝導を大幅に低減することができるようになる。
【００３２】
次に、発明の他の実施の形態について説明する。なお、この他の発明の実施の形態の説明にあたっては、前記発明の実施の形態１と同様の構成部分には同一の符号を付けてその説明を省略し、相違点についてのみ説明する。
【００３３】
（発明の実施の形態２）
この発明の実施の形態２の飲料水収容容器は、図３（容器本体部分の一部切欠正面図）、および、図４（図３のＩＶ−ＩＶ線における要部拡大断面図）に示すように、前記容器本体１における胴部１１の外面に多数並設される溝２が、胴部１１の円周方向線および該円周方向線に対し直交する方向線の両方向線に対し所定の角度を持つように傾斜状に形成されている点が、前記発明の実施の形態１とは相違したものである。
【００３４】
前記溝２の傾斜角度は任意であるが、胴部１１の円周方向線に対する傾斜角度が極端に小さいと、円周方向に延伸されている熱収縮性樹脂フィルム３の熱収縮方向との関係でフィルム３が凹部２２の内底部方向に食い込む程度が大きくなるため、好ましくない。
【００３５】
そこで、この発明の実施の形態２では、前記溝２が胴部１１の円周方向線に対し、約３０°の角度を持って傾斜状に形成することにより、熱収縮性樹脂フィルムの延伸方向が円周方向の場合でも、円周方向に直交する方向の場合でも、熱収縮性樹脂フィルム３と各凹部２２との間に十分な空間部４を確保することを可能にしたものである。
【００３６】
（発明の実施の形態３）
この発明の実施の形態３の飲料水収容容器は、図５（容器本体部分の一部切欠正面図）、および、図６（図５のＶＩ−ＶＩ線における要部拡大断面図）に示すように、前記容器本体１における胴部１１の外面に多数並設される溝２が、胴部１１の円周方向線に沿って形成されると共に、フィルムとして熱収縮性を有しない貼着フィルム３０を用いている点が、前記発明の実施の形態１、２とは相違したものである。
【００３７】
以上のように、溝２が、胴部１１の円周方向線に沿って形成されていると、前述のようにフィルムとして円周方向に延伸された熱収縮性樹脂フィルム３を用いることができない。即ち、溝２が、胴部１１の円周方向線に沿って形成されていると、前述のように、熱収縮性樹脂フィルムの収縮方向（延伸方向）と各凹部の方向が一致するため、熱収縮性樹脂フィルムが凹部に沿って食い込んで空気層が形成されなくなる。そこで、この発明の実施の形態３では、フィルムとして熱収縮性を有しない貼着フィルム３０を用い、この貼着フィルム３０を胴部１１の外面に貼着することにより、各凹部２２と貼着フィルム３０との間に中空部４が形成されるようにしたものである。
従って、この発明の実施の形態３においても、前記発明の実施の形態１、２とほぼ同様の効果が得られるようになる。
【００３８】
（発明の実施の形態４）
この発明の実施の形態４の飲料水収容容器は、図示は省略するが、予め外面に所定の印刷が施された状態の胴部１１に溝２が形成され、その外面に被せる前記フィルムが透明体で構成されているため、凸部と透明フィルムの作用により、筒状容器本体の表面が鏡面のように光りを反射し、また、見る角度によって、光りの反射により、缶表面に印刷が見えたり、見えなかったりする効果を生じる。これにより、美粧性が高まり、より客の目を引く容器となる。
従って、飲料水の販売促進効果を高めることができるようになる。
【００３９】
次に、凸部２１間ピッチＰは変更することなしに、ビード（凸部２１）の断面形状を変化させることにより、凸部２１とフィルムとの接触面積を８％〜１００％の範囲で変化させたサンプルを作成し、モニターテストを行った結果を図７の表に示す。このモニターテストは、２０人のモニターに対し、約５５℃に加温したボトル型缶のサンプルを素手で保持して開栓してもらい、その結果、問題なく保持できる場合は○、熱さを感じるものの保持できる場合は△、熱くて保持できない場合は×、という方法で評価してもらい、それぞれのサンプルについて、○、△および×と評価した人数から、○と評価した人の割合（○率　）、○と評価した人と△と評価した人の人数を合わせた人数の割合（○＋△率）、×と評価した人数の割合（×率）を算出した。
【００４０】
その結果、図７の表に示すように、フィルムとの接触面積が２０％以内であれば、○＋△率が１００％であり、８％以内になると○率が７０％以上であった。従って、凸部２１とフィルムとの接触面積の最も好ましい数値範囲は１０％以下と考えられ、また、接触面積が２０％以下であれば、実用上十分な断熱効果が得られると考えられる。
【００４１】
同様に、凸部２１間ピッチＰは変更することなしに、ビード（凸部２１）の断面形状を変化させることにより、凸部２１とフィルムとの接触面積を８％〜１００％の範囲で変化させたサンプルを作成し、フィルムに生じる結露量を測定した結果を図８の表に示す。
この測定では、内容量３５０ｍｌ用のボトル型缶の各サンプルに水を３５０ｍｌ充填し、約５℃の冷蔵庫において十分に冷蔵した後、気温４０℃、湿度９０％の恒温恒湿槽に５分間保持した。その後、サンプルの胴部に紙タオルを巻き付け、紙タオルに移動した結露量を測定した。
その結果を図８の表に示す。いずれの実施の形態においても、比較例と比べて結露量が少なく、また、接触面積が小さい程、結露量が少なくなっている。この測定結果から、フィルムとの接触面積が小さい程、結露量が少なくなる効果が顕著になることが認められた。
【００４２】
以上発明の実施の形態を図面により説明したが、具体的な構成はこれらの発明の実施の形態に限られるものではない。
例えば、発明の実施の形態では、容器本体１部分がアルミニウム等の金属性薄板でボトル型に形成されたものを例にとったが、手で持てる略筒状の胴部を備えたものであれば全体の容器形態は任意であり、その他に、例えば缶胴と缶底が一体に形成された、所謂２Ｐ缶や、円筒状の缶胴に底蓋が巻締められた所謂３Ｐ缶等の缶容器であってもよい。
【００４３】
また、発明の実施の形態では、胴部１１の円筒面を内方へ押し込んで溝２を形成することにより、隣接する両溝２−２間に凸部２１を形成し、凸部２１と凹部２２を交互に配置した状態としたが、胴部１１の円筒面を外方へ押し出して突条を形成し、隣接する両突条間に凹部を形成し、これにより、凸部と凹部を交互に配置するようにしてもよい。
【００４４】
また、発明の実施の形態では、容器本体１の構成材料としてアルミニウムを例に上げたが、その他にアルミニウム合金、スチール等の任意の金属で構成されたものに適用することができる。
また、発明の実施の形態１、２では、フィルムとして熱収縮性樹脂フィルム３を用いたが、発明の実施の形態３におけるように熱収縮性を有しない貼着フィルムを用いるようにしてもよい。
【００４５】
また、発明の実施の形態３では、熱収縮性を有しない貼着フィルムを用いたが、熱収縮性樹脂フィルムを用いて、その延伸方向缶胴の円周方向に直交する方向となるように取り付けることができる。
また、発明の実施の形態２では、胴部１１の円周方向線に対する溝の角度を約３０°に設定した例を示したが、発明の実施の形態３におけるようにフィルムとして熱収縮性を有しない貼着フィルムを用いる場合や、熱収縮性樹脂フィルムを用い、その延伸方向が缶胴の円周方向に直交する方向となるよう取り付ける場合には、前記角度を任意に設定することができる。
【００４６】
また、発明の実施の形態では、凹部２２および／または凸部２１を直線状に形成したが、波状や円弧状等に形成してもよい。
また、発明の実施の形態では、凹部２２および／または凸部２１を、同一の方向線に沿った１種類のみで構成させたが、格子状等のように、方向の異なる２種類以上の方向線に沿った２種類以上の凹部２２および／または凸部２１で構成するようにしてもよい。
また、発明の実施の形態では、凹部２２および／または凸部２１を線状の溝として形成したが、点状の突起や窪み等によって凹部２２および／または凸部２１を形成してもよい。
【図面の簡単な説明】
【図１】発明の実施の形態１の飲料水収容容器を示す容器本体部分の一部切欠正面図である。
【図２】図１のＩＩ−ＩＩ線における要部拡大断面図である。
【図３】発明の実施の形態２の飲料水収容容器を示す容器本体部分の一部切欠正面図である。
【図４】図３のＩＶ−ＩＶ線における要部拡大断面図である。
【図５】発明の実施の形態３の飲料水収容容器を示す容器本体部分の一部切欠正面図である。
【図６】図５のＶＩ−ＶＩ線における要部拡大断面図である。
【図７】モニターテストを行った結果を示す表である。
【図８】結露量の測定を行った結果を示す表である。
【符号の説明】
１　容器本体
１１　胴部
１２　肩部
１３　首部
２　溝
２１　凸部
２２　凹部
３　熱収縮性樹脂フィルム（フィルム）
３０　貼着フィルム（フィルム）
４　中空部
Ｈ　凹部の深さ
Ｐ　凸部間ピッチ
Ｗ　熱収縮性樹脂フィルムと凸部とが当接する部分の幅[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention particularly relates to an improvement in a metal drinking water storage container for storing drinking water such as coffee, tea, and cocoa that is sold in a heated state.
[0002]
[Prior art]
As a conventional drinking water storage container of this type, for example, a container described in JP-A-2001-48249 is known. The drinking water container of this conventional example is a drinking water container including a plastic bottle, an insulating sheet covering the bottle, and a cap, wherein a plurality of concave portions and / or convex portions are formed in a body portion of the bottle. And at least a body portion is covered with the heat insulating sheet.
In the conventional example, the bottle body provided with the plurality of concave portions and / or convex portions is covered with a heat insulating sheet as described above. By providing an air region between the containers, the heat insulating property of the container is further improved, and thereby, the cooling or warming effect of the cooled or heated drinking water can be enhanced.
[0003]
[Problems to be solved by the invention]
As described above, the drinking water storage container of the conventional example is intended for a plastic bottle, and since the thermal conductivity of the bottle itself is low, it can be held with bare hands even in a heated state. In order to enhance the cooling and warming effects of cooled or heated drinking water in bottles with capacities that cannot be reduced, a plurality of recesses and / or protrusions are provided in the body of the bottle, and the outer surface is covered with a heat insulating sheet to cover the air. Are provided.
[0004]
However, since the thermal conductivity of a drinking water container made of metal such as steel and aluminum is higher than that of a drinking water container made of synthetic resin such as plastic, the container in a heated hot state cannot be used. May not be able to be held with bare hands. Further, the outer surface of the metal container may be covered with a printed film showing the content of the product, but such a film usually has low heat insulation. Therefore, even with such a configuration, there is a case where it cannot be held with bare hands. In the case of a metal can, if the surface temperature exceeds 55 ° C., most people feel the heat and cannot hold the can, although there are individual differences when holding it with bare hands. Therefore, as in the conventional example, by applying a special process to the outer surface of the container or covering the outer surface of the container with a heat insulating sheet having a thick film, the container can be held with bare hands, The addition of a heat insulating sheet greatly increases the cost as a container.
[0005]
Further, in a cooled state, there is a problem that dew condensation occurs when kept at room temperature. If a container cooled in a refrigerator or the like is kept at room temperature, condensation may form on the surface, causing water droplets on the surface of the container to adhere to surrounding objects, and when holding the container by hand, the hands become wet or the container becomes slippery. Causes a problem that it becomes difficult to hold. This problem also occurs in a container made of a synthetic resin, but becomes more prominent in a metal container having a large thermal conductivity.
[0006]
The present invention has been made in view of the above-mentioned conventional problems, and it is possible to hold a hotly heated state with bare hands without causing a significant increase in cost, and to perform cooling. It is an object of the present invention to provide a metal-made drinking water container that can reduce the amount of dew condensation when kept at room temperature in the closed state.
[0007]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the drinking water storage container according to claim 1 of the present invention is a drinking water storage container having at least a body formed of a metal and having a substantially cylindrical shape, and A concave portion and / or a convex portion are formed on the surface of the cylindrical container main body, and a film is put on an outer surface of the cylindrical container main body, so that a convex portion on the surface of the holding portion composed of the concave and / or the convex is provided. A hollow portion is formed between each convex portion and the film by contacting and supporting the film, and in the holding portion, the area of the portion where the film comes into contact with each convex portion is the non-contact portion with respect to the film surface. The concave and / or convex portions are formed so as to be smaller than the projected area.
[0008]
The drinking water storage container according to claim 2 of the present invention is the drinking water storage container according to claim 1, wherein the area of the portion where the film comes into contact with each convex portion is the area of the portion where the film comes into contact with each convex portion. The concave portions and / or the convex portions are formed so as to be 20% or less of the total area of the non-contact portions projected on the film surface.
[0009]
In the drinking water storage container according to claim 3 of the present invention, in the drinking water storage container according to claim 1 or 2, the concave portion and / or the convex portion are formed as ridges and / or grooves, and the film has a specific shape. It is a heat-shrinkable film stretched in one direction, wherein the film is covered so that the stretching direction of the film is orthogonal to the direction in which the ridges and / or grooves are formed. I do.
[0010]
The drinking water storage container according to claim 4 of the present invention is the drinking water storage container according to any one of claims 1 to 3, wherein the concave portion and / or the convex portion have a circumferential line of the cylindrical container main body. And is formed so as to be inclined so as to have a predetermined angle with respect to both of a direction line orthogonal to the circumferential direction line.
[0011]
The drinking water storage container according to claim 5 of the present invention is the drinking water storage container according to any one of claims 1 to 4, wherein the cylindrical container main body in a state where predetermined printing is performed on an outer surface in advance. A concave portion and / or a convex portion is formed, and at least a part of the film covering the outer surface is a transparent body.
[0012]
Function and Effect of the Invention
In the drinking water storage container according to the first aspect of the present invention, as described above, the concave portion and / or the convex portion are formed on the surface of the cylindrical container main body portion of the metal drinking water storage container, and the metal container covers the outer surface thereof. In the film, the area of the portion that comes into contact with each of the convex portions formed by the large number of concave portions and / or convex portions is smaller than the projected area of the non-contact portion with respect to the film surface, and the concave portion and / or When the container is heated with a bare hand by the formation of the convex portion, the area of the portion of the convex portion where the film abuts is in contact with the hand through the film. In the other non-contact portions, a hollow portion is formed between each concave portion and the film.
[0013]
Therefore, of the convex portions of the container main body, the proportion of the portion that comes into contact with the hand is small, and the contact of each convex portion with the film reduces the conduction of heat to the hand. The effect is that the container can be held with bare hands even in a heated state. Similarly, when the film is cooled, when the film comes into contact with the surrounding air, only the portion that is in contact with the convex portion causes dew condensation, and the region where the hollow portion is formed between the concave portions is formed. Since no dew condensation occurs, the effect of reducing the amount of dew condensation on the container can be obtained.
Also, since the film is not intended to keep the heat, it is used as a label indicating the content of the product, so it is inexpensive compared to a thick or heat-insulating sheet that requires special processing for the purpose of keeping the heat, There is no significant cost increase.
[0014]
In the drinking water storage container according to the second aspect of the present invention, as described above, the area of the portion where the film abuts each convex portion, the area of the portion where the film abuts each convex portion, and the non-contact portion When the concave and / or convex portions are formed so as to be 20% or less of the total area of the projections with respect to the film surface of the film surface, the barely heated container is held with bare hands. In each of the convex portions, the area of the portion in contact with the film is a portion in contact with the hand through the film, and in the other non-contact portions, a hollow portion is formed between each concave portion and the film.
[0015]
Therefore, among the convex portions of the cylindrical container main body, the proportion of the portion that comes into contact with the hand is extremely small, and heat conduction to the hand is greatly reduced by contacting each convex portion with the film. Thus, an effect is obtained that the container can be easily held with bare hands even in a state where the container is heated to a high temperature. Similarly, when the film is cooled, when the film comes into contact with the surrounding air, the ratio of the portion where the film and the convex portion are in contact is small, and therefore, the ratio of the portion where dew condensation occurs on the film surface is small. Therefore, the effect that the amount of condensation adhering to the container can be significantly reduced can be obtained.
In addition, since the surface of the film forms a surface different from the cylindrical surface (polyhedral surface or the like), the surface of the cylindrical container main body reflects light like a mirror surface. , It becomes a more eye-catching container.
[0016]
In the drinking water container according to claim 3, as described above, the film is a heat-shrinkable film that is stretched in one specific direction, and the stretching direction of the film is such that the ridge or groove is formed. The structure in which the film is covered so as to be orthogonal to the direction in which the film is formed allows a hollow portion to be formed between the concave portion and the film even when a heat-shrinkable film is used as the film. In other words, a heat-shrinkable film stretched in a specific direction shrinks greatly in the stretching direction when heated, but shrinks only slightly in the direction perpendicular to the stretching direction. For example, when the above-mentioned stretched film is made of a resin such as polyester or polyethylene, the shrinkage ratio in the stretching direction (difference in film length before and after shrinkage / film length before shrinkage) is 70% to 80%. On the other hand, the shrinkage in the direction perpendicular to the stretching direction is much smaller than that. Therefore, when the film is heated by blowing hot air with the film attached to the cylindrical container main body so that the stretching direction of the film is orthogonal to the direction in which the ridges or grooves are formed, the heat shrinkage occurs. The heat-shrinkable film is brought into contact with and supported by each of the protrusions formed by a large number of protrusions or grooves by shrinking the film having the property in the direction perpendicular to the direction in which the protrusions or grooves are formed. The heat-shrinkable film is in a state of being stretched in a straight line between the adjacent convex portions, thereby reliably forming a hollow portion between each concave portion and the heat-shrinkable film. be able to.
Therefore, heat conduction to the hand can be significantly reduced by the heat insulating effect of the air layer formed in the hollow portion.
[0017]
In the drinking water storage container according to claim 4, as described above, the concave portion and / or the convex portion are bidirectional lines of a circumferential direction line of the cylindrical container body and a direction line orthogonal to the circumferential direction line. Since the film is formed to be inclined so as to have a predetermined angle with respect to the film, when a heat-shrinkable film is used as the film, the stretching direction is the circumferential direction or the axial direction (the direction orthogonal to the circumferential direction). In any case, a hollow portion can be formed between the concave portion and the film. That is, when each of the concave portions and / or the convex portions is formed along the circumferential direction line of the cylindrical container main body portion, when a film having a heat-shrinkability stretched in the circumferential direction is used as a film, Since the shrinking direction of the film having shrinkage and the direction of each concave portion match, the heat-shrinkable resin film cuts along the concave portion so that an air layer is not formed. The convex portions are formed so as to be inclined so as to have a predetermined angle with respect to at least a circumferential line of the cylindrical container main body portion, so that the heat-shrinkable resin film is supported by both adjacent convex portions. Therefore, a hollow portion can be formed between the concave portion and the film.
[0018]
In the drinking water storage container according to claim 5, as described above, the ridge or the groove is formed in the cylindrical container main body in a state where predetermined printing has been performed on the outer surface in advance, and the film to cover the outer surface thereof Is composed of a transparent body at least in part, so that the film has a polyhedral surface, and the surface of the cylindrical container main body reflects light like a mirror surface to enhance the aesthetics. In some parts, depending on the viewing angle, the reflection of light produces the effect of making the printing on the can surface visible or invisible, resulting in a more eye-catching container.
Therefore, the sales promotion effect of drinking water can be enhanced.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described below with reference to the drawings.
(Embodiment 1)
First, the configuration of the first embodiment of the present invention will be described with reference to FIG.
FIG. 1 is a partially cutaway front view of a container body showing a drinking water container according to a first embodiment of the present invention, and FIG. 2 is an enlarged sectional view of a main part taken along line II-II in FIG.
[0020]
As shown in these drawings, in Embodiment 1 of the present invention, a portion of a container body (tubular container body portion) 1 is formed in a bottle shape from a thin metal plate such as aluminum. That is, the body 11 of the container body 1 is formed in a cylindrical shape with a bottom, and a small-diameter neck 13 having a drinking mouth is integrally formed on the upper portion thereof via a hemispherical shoulder 12. An external thread 14 for screwing a screw cap (not shown) is formed in the neck portion 13.
[0021]
On the outer surface of the body 11 of the container body 1, a large number of grooves 2 forming a concave portion 22 extending in a direction intersecting at right angles to the circumferential direction line of the body 11 are arranged in close proximity to each other, The protruding portions 22 are formed between the adjacent grooves 2-2, whereby a large number of the protruding portions 21 and the concave portions 22 are alternately arranged along the circumferential line of the body portion 11. .
[0022]
A heat-shrinkable resin film (film) 3 constituting a label for displaying the content of a product or the like is attached to the outer peripheral surface of the body 11 including the convex portion 21 and the concave portion 22 formed by the large number of grooves 2. I have. The heat-shrinkable resin film 3 is a film having a property that its surface area shrinks when heat is applied, and is formed of a heat-shrinkable resin such as polyester or polystyrene into a cylinder having a larger diameter than the body 11. In this case, a structure that is largely contracted in a circumferential direction which is a stretching direction is used. In addition, on the outer surface of the can body, there is a region where no irregularities are formed above and below the region where the convex portion 21 and the concave portion 22 are formed. In this portion, the film 3 is attached to the outer periphery. It is provided for the purpose of enhancing the adhesiveness to the can body when it is used. It is preferable that the position and the shape of this region do not become an obstacle when the can body is held at the portion where the unevenness is formed.
[0023]
That is, the heat-shrinkable resin film 3 is thermally shrunk in the circumferential direction by applying heat with hot air or the like while the cylindrical heat-shrinkable resin film 3 is put on the outer periphery of the body 11 of the container body 1. In this state, the heat-shrinkable resin film 3 is stretched in a straight line between the adjacent two convex portions 21-21. Therefore, the hollow portion 4 constituting the air layer is formed between the heat-shrinkable resin film 3 and each of the recesses 22.
[0024]
The hollow portion 4 is heated by holding the body portion 11 with bare hands by bringing the heat-shrinkable resin film 3 with which the hand comes into direct contact and the concave portion 22 into a non-contact state via an air layer. Serves to prevent the heat of the container body 1 containing the stored drinking water from being directly transmitted to the hand, and also prevents the entire surface of the film from being directly cooled by the container body 1 containing the cooled drinking water. This serves to significantly suppress the occurrence of condensation.
[0025]
Therefore, the area of the groove 2 is arranged so that the area ratio of the portion where the heat-shrinkable resin film 3 contacts each convex portion 21 is smaller than at least other non-contact portions, that is, the surface area of the hollow portion 4. It is necessary that the setting pitch be set, and preferably, the smaller the proportion of the area of the portion in contact with the convex portion 21, the less the heat can be transmitted to the hand, and the amount of condensation Can be reduced.
[0026]
The pitch P between the two convex portions 21-21 formed by the grooves 2 is the difference D between the radius of the convex portion 21 and the radius of the concave portion 22 and the depth H of each concave portion 22 (the film surface and the concave portion 22). Is set in consideration of the relationship with the distance. That is, when the size of the D is the same, the depth of the H decreases as the pitch P increases, and at a pitch P of a certain size, the film 3 comes into contact with the concave portion 22 and the hollow portion 4 is formed. Will not be done. There is a limit to the size of D due to the material and thickness of the body 11, and the depth at which the predetermined hollow portion 4 can be maintained between the heat-shrinkable resin film 3 and each recess 22. The pitch P is set in a range where H can be secured. The predetermined hollow portion 4 is a hollow portion 4 having such a depth that at least there is no possibility that the heat-shrinkable resin film 3 comes into contact with the concave portion 22 with at least a pressing force when grasped with a hand.
[0027]
The pitch P between the two convex portions 21-21 formed by the respective grooves 2 becomes 3.5 mm, and a heat-shrinkable polyester resin film 3 having a thickness of 50 μm is mounted on the outer surface thereof by heat shrinkage. In this state, the shape of the convex portion 21 and the concave portion 22 is such that the width W of the portion where the heat-shrinkable resin film 3 contacts each convex portion 21 is 0.25 mm, and the depth H of each concave portion 22 is 0.23 mm. As a result, a good heat insulating effect was obtained. Incidentally, in the case of this example, since the length of the groove 2 in the longitudinal direction of the can body is equal, the area of the portion where the heat-shrinkable resin film 3 contacts each convex portion 21 and the area of the contact portion are different from each other. The ratio of the contact area to the total area of the projected areas on the film surface was equal to the ratio of the width W of the contact area to the pitch P, and was set to W: P = 0.25: 3.5. Will be.
[0028]
Next, the operation and effect of the first embodiment of the present invention will be described.
In the drinking water storage container according to the first embodiment of the present invention, since the configuration is as described above, when the body 11 of the container body 1 in a state of being heated to a higher temperature is held with bare hands, each of the convex portions is used. 21, only the area (width W) of the portion where the heat-shrinkable resin film 3 is in contact with the hand through the heat-shrinkable resin film 3, and the other portions are in contact with the respective recesses 22 and the heat-shrinkable resin. The heat-shrinkable resin film 3 not in contact with the body 11 is brought into contact with the hand by the hollow portion 4 formed between the film 3 and the hollow portion 4.
[0029]
Therefore, the ratio of the portion of each convex portion 21 that comes into contact with the hand is small, and the heat is transferred to the hand by indirect contact with each convex portion 21 via the heat-shrinkable resin film 3. As a result, even when the drinking water is heated to a higher temperature, an effect is obtained that the aluminum body 11 having a high thermal conductivity can be held with bare hands.
[0030]
Further, since the heat-shrinkable resin film 3 is not intended to keep the heat, but is used as a label indicating the content of the product, the heat-shrinkable resin film 3 is inexpensive compared to a heat insulating sheet which is thick or requires special processing for the purpose of keeping the heat. Therefore, there is no significant cost increase.
[0031]
Further, since the groove 2 is formed so as to intersect at right angles with the circumferential direction line of the container body 1, even when the heat-shrinkable resin film 3 which is stretched in the circumferential direction is used as the film. The hollow portion 4 can be formed between the concave portion 22 and the heat-shrinkable resin film 3. That is, when hot air or the like is blown onto the heat-shrinkable resin film 3, the heat-shrinkable resin film 3 contracts in the circumferential direction, which is the direction in which the heat-shrinkable resin film 3 extends, and the heat-shrinkable resin film 3 shrinks to each of the convex portions 21 formed by the large number of grooves 2. The heat-shrinkable resin film 3 is in a state of being stretched linearly between the adjacent two convex portions 21-21 by the abutting support of the conductive resin film 3, whereby the respective concave portions 22 and the heat The hollow portion 4 can be reliably formed between the shrinkable resin film 3 and the shrinkable resin film 3.
Therefore, heat conduction to the hand can be greatly reduced by the heat insulating effect of the air layer formed in the hollow portion 4.
[0032]
Next, another embodiment of the invention will be described. In the description of the other embodiments of the present invention, the same components as those of the first embodiment of the present invention are denoted by the same reference numerals, and the description thereof will be omitted. Only the differences will be described.
[0033]
(Embodiment 2)
The drinking water container according to the second embodiment of the present invention is shown in FIG. 3 (a partially cutaway front view of the container body) and FIG. 4 (an enlarged cross-sectional view of a main part taken along line IV-IV in FIG. 3). A large number of grooves 2 arranged in parallel on the outer surface of the body 11 of the container body 1 have a predetermined angle with respect to both the circumferential direction line of the body 11 and the direction line orthogonal to the circumferential direction line. This is different from the first embodiment of the present invention in that it is formed so as to have an inclination.
[0034]
The inclination angle of the groove 2 is arbitrary, but if the inclination angle of the body portion 11 with respect to the circumferential direction line is extremely small, the relationship with the heat shrink direction of the heat-shrinkable resin film 3 that is stretched in the circumferential direction. This increases the degree to which the film 3 bites into the inner bottom of the recess 22, which is not preferable.
[0035]
Therefore, in the second embodiment of the present invention, the groove 2 is formed to be inclined at an angle of about 30 ° with respect to the circumferential line of the body portion 11 so that the stretching direction of the heat-shrinkable resin film can be improved. Is sufficient to secure a sufficient space 4 between the heat-shrinkable resin film 3 and each of the recesses 22 regardless of whether it is in the circumferential direction or in the direction perpendicular to the circumferential direction.
[0036]
(Embodiment 3)
The drinking water storage container according to the third embodiment of the present invention is shown in FIG. 5 (partially cutaway front view of the container main body) and FIG. 6 (enlarged sectional view taken along line VI-VI in FIG. 5). In addition, a large number of grooves 2 arranged in parallel on the outer surface of the body 11 of the container body 1 are formed along the circumferential direction line of the body 11, and the adhesive film 30 having no heat shrinkage as a film. Is different from the first and second embodiments of the present invention.
[0037]
As described above, if the groove 2 is formed along the circumferential line of the body 11, the heat-shrinkable resin film 3 stretched in the circumferential direction cannot be used as the film as described above. . That is, when the groove 2 is formed along the circumferential line of the body 11, the contraction direction (stretching direction) of the heat-shrinkable resin film and the direction of each recess match as described above. The heat-shrinkable resin film cuts along the concave portion, so that an air layer is not formed. Therefore, in the third embodiment of the present invention, the adhesive film 30 having no heat shrinkage is used as a film, and the adhesive film 30 is attached to the outer surface of the body portion 11 so that each of the concave portions 22 is attached. The hollow portion 4 is formed between the film 30 and the film 30.
Therefore, in the third embodiment of the present invention, substantially the same effects as those of the first and second embodiments of the present invention can be obtained.
[0038]
(Embodiment 4)
Although not shown, the drinking water container according to the fourth embodiment of the present invention has a groove 2 formed in a body 11 in a state where predetermined printing has been performed on an outer surface thereof, and the film to cover the outer surface is transparent. Because of the body, the surface of the cylindrical container body reflects light like a mirror surface due to the action of the projections and the transparent film, and depending on the viewing angle, the print can be seen on the can surface due to the reflection of light. Or invisible. Thereby, the cosmetics are enhanced, and the container becomes more eye-catching.
Therefore, the sales promotion effect of drinking water can be enhanced.
[0039]
Next, by changing the cross-sectional shape of the bead (projection 21) without changing the pitch P between the projections 21, the contact area between the projection 21 and the film is changed in the range of 8% to 100%. The result of the monitor test performed by preparing a sample subjected to the monitoring is shown in the table of FIG. In this monitor test, a sample of a bottle-shaped can heated to about 55 ° C. was opened by holding it with bare hands on 20 monitors, and as a result, when the sample can be held without any problem, ○, feeling hot When the object can be held, the evaluation is as follows: △, when it cannot be held because it is hot, the evaluation is ×, and the ratio of the person who evaluated as ○ from the number of people who evaluated as ○, △ and × for each sample (○ rate) , The ratio of the number of people evaluated as ○ and the number of people evaluated as △ (△ + △ ratio), and the ratio of the number of people evaluated as × (× ratio) were calculated.
[0040]
As a result, as shown in the table of FIG. 7, when the contact area with the film was within 20%, the O + Δ ratio was 100%, and when it was within 8%, the O ratio was 70% or more. Therefore, the most preferable numerical range of the contact area between the projection 21 and the film is considered to be 10% or less, and if the contact area is 20% or less, it is considered that a practically sufficient heat insulating effect can be obtained.
[0041]
Similarly, by changing the cross-sectional shape of the bead (projection 21) without changing the pitch P between the projections 21, the contact area between the projection 21 and the film is changed in the range of 8% to 100%. The results of measuring the amount of dew condensation generated on the film after the sample was prepared are shown in the table of FIG.
In this measurement, each sample of a 350-ml bottle-shaped can was filled with 350 ml of water, sufficiently refrigerated in a refrigerator at about 5 ° C., and then kept in a thermo-hygrostat at 40 ° C. and 90% humidity for 5 minutes. did. Thereafter, a paper towel was wrapped around the body of the sample, and the amount of dew condensation transferred to the paper towel was measured.
The results are shown in the table of FIG. In any of the embodiments, the amount of dew condensation is smaller than that of the comparative example, and the smaller the contact area, the smaller the amount of dew condensation. From this measurement result, it was recognized that the smaller the contact area with the film, the more significant the effect of reducing the amount of dew condensation.
[0042]
Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments.
For example, in the embodiment of the present invention, a case where the container body 1 is formed of a thin metal plate such as aluminum in the shape of a bottle is taken as an example, but any container having a substantially cylindrical body that can be held by hand may be used. If the whole container form is arbitrary, for example, cans such as a so-called 2P can in which a can body and a can bottom are integrally formed, and a so-called 3P can in which a bottom lid is wound around a cylindrical can body It may be a container.
[0043]
Further, in the embodiment of the invention, the cylindrical surface of the body 11 is pushed inward to form the groove 2, so that the convex portion 21 is formed between the adjacent grooves 2-2, and the convex portion 21 and the concave portion are formed. 22 were alternately arranged, but the cylindrical surface of the body 11 was pushed outward to form a ridge, and a recess was formed between adjacent ridges, whereby the protrusion and the recess were alternated. May be arranged.
[0044]
Further, in the embodiment of the invention, aluminum is taken as an example of a constituent material of the container body 1, but the present invention can be applied to any other material made of any metal such as an aluminum alloy and steel.
Further, in the first and second embodiments of the invention, the heat-shrinkable resin film 3 is used as the film, but an adhesive film having no heat-shrinkability as in the third embodiment of the invention may be used. .
[0045]
Further, in the third embodiment of the present invention, the adhesive film having no heat shrinkage is used, but the heat shrinkable resin film is used so that the stretching direction is perpendicular to the circumferential direction of the can body. Can be attached.
Further, in the second embodiment of the invention, an example is shown in which the angle of the groove with respect to the circumferential line of the body 11 is set to about 30 °, but as in the third embodiment of the invention, the film has heat shrinkage. When using an adhesive film that does not have, or when using a heat-shrinkable resin film and attaching so that the stretching direction is perpendicular to the circumferential direction of the can body, the angle can be set arbitrarily. .
[0046]
Further, in the embodiment of the present invention, the concave portion 22 and / or the convex portion 21 are formed in a straight line, but may be formed in a wave shape, an arc shape, or the like.
Further, in the embodiment of the present invention, the concave portion 22 and / or the convex portion 21 are configured by only one type along the same direction line. However, two or more types of directions having different directions, such as a lattice shape, are used. It may be configured by two or more types of concave portions 22 and / or convex portions 21 along the line.
Further, in the embodiment of the present invention, the concave portions 22 and / or the convex portions 21 are formed as linear grooves. However, the concave portions 22 and / or the convex portions 21 may be formed by point-like projections or depressions.
[Brief description of the drawings]
FIG. 1 is a partially cutaway front view of a container body showing a drinking water storage container according to a first embodiment of the present invention.
FIG. 2 is an enlarged sectional view of a main part taken along line II-II of FIG.
FIG. 3 is a partially cutaway front view of a container body showing a drinking water container according to a second embodiment of the present invention.
FIG. 4 is an enlarged sectional view of a main part taken along line IV-IV in FIG. 3;
FIG. 5 is a partially cutaway front view of a container body showing a drinking water storage container according to a third embodiment of the present invention.
6 is an enlarged cross-sectional view of a main part along line VI-VI in FIG. 5;
FIG. 7 is a table showing the results of a monitor test.
FIG. 8 is a table showing the results of measuring the amount of dew condensation.
[Explanation of symbols]
1 container body
11 torso
12 Shoulder
13 Neck
2 groove
21 convex part
22 recess
3 heat shrinkable resin film (film)
30 Adhesive film (film)
4 hollow part
H Depth of recess
P Pitch between convex parts
W Width of the part where the heat-shrinkable resin film and the convex part are in contact

Claims

At least a container body portion is a drinking water container having a body portion formed of a substantially cylindrical shape made of metal,
A concave portion and / or a convex portion are formed on the surface of the cylindrical container body,
By covering the outer surface of the cylindrical container body with a film, the film is brought into contact with and supported by the convex portion on the surface of the holding portion composed of the concave portion and / or the convex portion, and a hollow is formed between each convex portion and the film. Part is formed,
In the holding portion, the concave portion and / or the convex portion are formed such that an area of a portion where the film comes into contact with each convex portion is smaller than a projection area of the non-contact portion with respect to the film surface. Drinking water container.

The area of the portion where the film comes into contact with each convex portion is 20% or less of the total area of the area of the portion where the film comes into contact with each convex portion and the projected area of the non-contact portion with respect to the film surface. The drinking water container according to claim 1, wherein a concave portion and / or a convex portion are formed.

The concave and / or convex portions are formed as ridges and / or grooves,
The film is a heat-shrinkable film that is stretched in a specific direction, and the film is covered so that a stretching direction of the film is orthogonal to a direction in which the ridges and / or grooves are formed. The drinking water container according to claim 1 or 2, wherein

The concave portion and / or the convex portion are formed so as to be inclined so as to have a predetermined angle with respect to both a circumferential direction line of the cylindrical container body and a direction line orthogonal to the circumferential direction line. The drinking water container according to any one of claims 1 to 3, characterized in that:

The concave portion and / or the convex portion are formed in the cylindrical container main body in a state where predetermined printing has been performed on an outer surface in advance, and at least a part of the film covering the outer surface is a transparent body. The drinking water container according to claim 1.