JP7319239B2 - シート材容器 - Google Patents
シート材容器 Download PDFInfo
- Publication number
- JP7319239B2 JP7319239B2 JP2020168387A JP2020168387A JP7319239B2 JP 7319239 B2 JP7319239 B2 JP 7319239B2 JP 2020168387 A JP2020168387 A JP 2020168387A JP 2020168387 A JP2020168387 A JP 2020168387A JP 7319239 B2 JP7319239 B2 JP 7319239B2
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Description
(1-1.全体構成)
まず、図1~図9に基づいて、本実施形態に係るシート材容器100の全体構成について説明する。本実施形態に係るシート材容器100の構成として、例えば特許第6193535号公報に開示された構成を採用することができる。具体的には、図1~図4に示すように、シート材容器100は、収容物96を収容するとともに収容物96を排出可能な開口部14を有する内容器10と、複数のフィルム層121、122を積層した容器本体構成シート材120で構成されていて、内容器10を覆っている(包囲している)容器本体20と、外気を内容器10の外面と容器本体20の内面との間に導入させる外気導入部26とを備える。
図2に示すように、内容器10は、内容器10の上端部に形成された天マチ部12と、内容器10の底部に形成された底マチ部13と、天マチ部12と底マチ部13との間の部分である胴部11と、を備える。内容器10の内部空間は、収容物96を収容する収容領域となっている。
容器本体20は、例えば、図6に示す容器構成シート400(容器本体構成シート材120に内容器構成シート材110を積層、接合したシート材)を折り曲げて当該容器本体構成シート材120の周縁部同士、または内容器構成シート材110の周縁部同士を接合することによって、図1に示すような形状に形成されている。
まず、図4、図6及び図9に示すように、フィルム層121、122を相互に積層し、これらを部分的に接合(例えばヒートシール)することにより容器本体構成シート材120を作製する。すなわち、フィルム層121、122を接合するに際しては、フィルム層121、122間の一部を非接合とすることで、非接合部123を形成する。したがって、容器本体構成シート材120には、フィルム層121、122が相互に接合されたフィルム領域と、これらが非接合とされた非接合部123とが形成される。
つぎに、図9~11に基づいて、内容器構成シート材110及び容器本体構成シート材120の詳細な構成について説明する。容器本体構成シート材120は、フィルム層121、122が互いに積層された層構造を有する。フィルム層121は基材フィルム121a、接合層121bを有し、フィルム層122は基材フィルム122a、接合層122bを有する。そして、接合層121bが基材フィルム121a、122aを接合している。したがって、容器本体構成シート材120は複数の基材フィルム121a、122aが積層された構造を有しているとも言える。
つぎに、図9に基づいて内容器構成シート材110の詳細な構成について説明する。本実施形態に係る内容器構成シート材110は、基材フィルム110a及び接合層110bを備える。基材フィルム110aの樹脂は特に制限されず、基材フィルム121a、122aと同種であってもよいし、他の種類の樹脂であってもよい。基材フィルム110aの樹脂が基材フィルム121a、122aと同種となる場合、室温(=25℃)での引張弾性率が1GPa以上であるのが好ましい。他の種類の樹脂としては、例えば延伸ナイロン等が挙げられる。
(1-1.基材フィルム及び接合剤の準備)
実施例1~31では、基材フィルム121a、122aとして厚さの異なるPETフィルムを準備した。また、接合層121b、122bを構成する接合剤としてポリエステル系接合剤(東亞合成社製)を準備した。さらに、実施例32では、基材フィルム121a、122aとしてナイロンフィルム、及び接合層121b、122bとしてポリエチレンフィルム(LLDPE)を準備した。
以下の試験により実施例1~32の環境特性(具体的には薄膜化及びリサイクル性)を評価した。まず、実施例1~31では、基材フィルム121a、122aを上記の接合層121bで接合した試験用シート材を作製した。接合時の圧力及び温度はすべての実施例及び後述する比較例で共通とした。この試験用シート材は、基材フィルム121a、122aと、接合層121bとで構成される。実施例毎に基材フィルム121a、122a及び接合層121bの厚さを変更した。また、実施例32は、基材フィルム121a、122aと2つの接合層121bとをドライラミネートにより接合し、図11に示すような、2つの接合層121b間に充填材封入部41が備わる試験用シート材を作製した。
上記基材フィルム121a、122a、及び接合層121b、122bを用いてフィルム層121、122を作製した。ここで、基材フィルム121a、122aの厚さ及び接合層121b、122bの厚さは試験用シート材における基材フィルム121a、122aの厚さ及び接合層121bの厚さと同様とした。さらに、内容器構成シート材110として後述する比較例1と同様の内容器構成シート材110を準備した。ついで、上述した製造方法に従ってシート材容器100を作製した。ここで、シート材容器100の製造条件(フィルム層121、122の形状、充填材封入部41の形状、充填材の種類、充填材封入部の内圧、シール圧力、シール温度、シール部25、27の幅等)は全て同一条件とした。すなわち、実施例1~32のシート材容器100の違いはフィルム層121、122の層構成(具体的には各層の厚さ、材質)のみとした。
1:応力が比較例3の3.0倍以上である。
2:応力が比較例3の1.5倍以上3.0倍未満である。
3:応力が比較例3の1.0倍以上1.5倍未満である。
4:応力が比較例3の1.0倍未満であるが、圧縮試験中にシート材容器100が座屈しなかった。
5:応力が比較例3の1.0倍未満であり、圧縮試験中にシート材容器100が座屈した。
(2-1.シート材の層構成)
まず、図12に基づいて、比較例1~3で使用した各シート材の層構成について説明する。比較例1~3で使用した容器本体構成シート材220は、フィルム層221、222を備える。フィルム層221は、本実施形態のフィルム層121に対応する層であり、基材フィルム221c及び接合層221fを備える。フィルム層222は、本実施形態のフィルム層122に対応する層であり、接合層222c、基材フィルム222d、及び接合層222eを備える。接合層221f、222cが本実施形態の接合層121bに対応し、接合層222eが本実施形態の接合層122bに対応すると言える。基材フィルム221c、222d間に充填材封入部41が形成される。内容器構成シート材210は、接合層210c、基材フィルム210d、及び接合層210eを備える。
表面に接合層221fを形成した基材フィルム221cと、表面に接合層222cを形成した基材フィルム222dを準備し、互いの接合層が対向するようにこれらを重ね合わせた。基材フィルム221c、222d、及び接合層221f、222cの厚さは比較例1~3で異なる値とした。ついで、実施例1~32と同様の圧力及び温度で積層体を加圧した。これにより試験用シート材を作製した。その後は実施例1~32と同様の試験により薄膜化及びリサイクル性を評価した。また、B/Aを算出した。ここでのAは、接合層221f、222cの総厚さとなる。
容器本体構成シート材220及び内容器構成シート材210を用いてシート材容器を作製した。ここで、基材フィルム221c、222d、及び接合層221f、222cの厚さは試験用シート材における基材フィルム221c、222d、及び接合層221f、222cの厚さと同様とした。また、接合層222eの厚さを30μmとし、接合層210c、基材フィルム210d、及び接合層210eの厚さをそれぞれ30μm、15μm、60μmとした。ついで、上述した製造方法に従ってシート材容器を作製した。ここで、シート材容器の製造条件は実施例1~32と同一条件とした。すなわち、比較例1~3と実施例1~32のシート材容器の違いはフィルム層221、222の層構成(具体的には各層の厚さ及び樹脂の種類)のみとした。その後、実施例1~32と同様の試験により容器剛性を評価した。
実施例1~32及び比較例1~3の層構成(試験用シート材の層構成)及び評価結果、ならびに同種の樹脂で構成されている実施例1~32の基材フィルム121a及び122aについてのJIS K 7127(プラスチック-引張特性の試験方法、第3部:フィルム及びシートの試験条件)に準拠して測定した室温(=25℃)での引張弾性率を表1~3にまとめて示す。
<1>収容物を収容する収容領域を包囲する容器本体を備えるシート材容器であって、前記容器本体は、複数の基材フィルムを積層した容器本体構成シート材で構成されていて、前記容器本体構成シート材は、前記複数の基材フィルムと、基材フィルム同士を接合する接合層と、前記複数の基材フィルム同士の間に形成され、充填材が充填される充填材封入部と、を備え、前記複数の基材フィルムは、同種の樹脂で構成されている、シート材容器。
<2>前記複数の基材フィルムは、室温での引張弾性率が1GPa以上、好ましくは2GPa以上、より好ましくは3GPa以上である、<1>に記載のシート材容器。
<3>前記接合層の総厚さは50μm以下、好ましくは30μm以下である、<1>または<2>に記載のシート材容器。
<4>前記接合層の総厚さに対する前記複数の基材フィルムの総厚さの比は0.58より大きい、好ましくは1.00以上、より好ましくは1.3以上である、<1>~<3>のいずれか1つに記載のシート材容器。
<5>前記接合層の総厚さに対する前記複数の基材フィルムの総厚さの比は60以下、好ましくは40以下、より好ましくは30以下、さらに好ましくは10以下、さらに好ましくは3以下である、<1>~<4>のいずれか1つに記載のシート材容器。
<6>前記複数の基材フィルムは、いずれも9μm以上、好ましくは12μm以上、より好ましくは15μm以上の厚さである、<1>~<5>のいずれか1つに記載のシート材容器。
<7>前記複数の基材フィルムは、いずれも50μm以下、好ましくは40μm以下、より好ましくは30μm以下の厚さである、<1>~<6>のいずれか1つに記載のシート材容器。
<8>前記複数の基材フィルムの融点は前記接合層の融点と異なる、好ましくは前記複数の基材フィルムの融点が前記接合層の融点よりも大きい、より好ましくは100℃以上大きい、さらに好ましくは150℃以上大きい、さらに好ましくは200℃以上大きい、<1>~<7>のいずれか1つに記載のシート材容器。
<9>前記充填材封入部は、前記接合層が接合する2層の基材フィルムのうち、一方の基材フィルムまたは両方の基材フィルムに接触している、<1>~<8>のいずれか1つに記載のシート材容器。
<10>前記複数の基材フィルムは、ポリアミド系樹脂、ポリエステル系樹脂、ポリオレフィン系樹脂、アクリル系樹脂、塩化ビニル系樹脂、ポリカーボネート系樹脂、ポリスチレン系樹脂、エチレン-ビニルアルコール共重合体系樹脂、及びポリイミド系樹脂から選択されるいずれか1種以上の樹脂で構成される、<1>~<9>のいずれか1つに記載のシート材容器。
<11>前記複数の基材フィルムは、ポリアミド系樹脂またはポリエステル系樹脂で構成される、<10>に記載のシート材容器。
<12>前記複数の基材フィルムと前記接合層とが同種の樹脂で構成されている、<1>~<11>のいずれか1つに記載のシート材容器。
<13>前記複数の基材フィルムおよび前記接合層は、いずれもポリエステル系樹脂で構成される、<12>に記載のシート材容器。
<14>前記複数の基材フィルムはポリアミド系樹脂で構成され、前記接合層はポリオレフィン系樹脂で構成される、<1>~<11>に記載のシート材容器。
<15>前記複数の基材フィルムのいずれか1層以上の基材フィルムに印刷がなされている、<1>~<14>のいずれか1つに記載のシート材容器。
<16>前記複数の基材フィルムは、いずれも単層構造である、<1>~<15>のいずれか1つに記載のシート材容器。
<17>前記充填材封入部は、前記容器本体において上下方向に延在している構成を含む、<1>~<16>のいずれか1つに記載のシート材容器。
<18>前記容器本体の上下方向に延在する前記充填材封入部は、前記容器本体の前記収容領域を挟んだ両側において、いずれの側にも、前記容器本体の幅方向の両縁部分に沿って一対以上備わる、<17>に記載のシート材容器。
<19>前記シート材容器の上端部に天マチ部が形成され、前記天マチ部のシート材と、基部を備えるスパウトの前記基部とが接合されている、<1>~<18>のいずれか1つに記載のシート材容器。
<20>前記スパウトは、前記複数の基材フィルムまたは前記接合層と同種の樹脂で構成されている、<19>に記載のシート材容器。
<21>前記充填材封入部は、前記容器本体の前記収容領域を挟んだ両側の少なくとも一方において前記スパウトの前記基部と隣接している、<19>または<20>に記載のシート材容器。
<22>前記容器本体の前記収容領域を挟んだ両側の少なくとも一方において、前記容器本体の上下方向に延在する一対以上の前記充填材封入部が、前記容器本体の幅方向に延在する前記充填材封入部を介して前記容器本体の上端部において連通し、前記幅方向に延在する前記充填材封入部が前記基部と隣接している、<21>に記載のシート材容器。
<23>前記容器本体に包囲されている内容器を備え、前記内容器が前記収容領域を有するとともに、前記複数の基材フィルムと同種の樹脂で構成されている、<1>~<22>のいずれか1つに記載のシート材容器。
10 内容器
20 容器本体
41 充填材封入部
110 内容器構成シート材
110a 基材フィルム
110b 接合層
120 容器本体構成シート材
121 フィルム層
121a 基材フィルム
121b 接合層
122 フィルム層
122a 基材フィルム
122b 接合層
Claims (4)
- 収容物を収容する収容領域を包囲する容器本体を備えるシート材容器であって、
前記容器本体は、複数の基材フィルムを積層した容器本体構成シート材で構成されていて、
前記容器本体構成シート材は、前記複数の基材フィルムと、基材フィルム同士を接合する接合層と、前記複数の基材フィルム同士の間に形成され、充填材が充填される充填材封入部と、を備え、
前記複数の基材フィルムは、同種の樹脂で構成されており、
前記接合層の総厚さは1μm以上30μm以下であり、
前記接合層の総厚さに対する前記複数の基材フィルムの総厚さの比は0.58より大きく且つ60以下である、
シート材容器。 - 前記複数の基材フィルムは、室温での引張弾性率が1GPa以上である、請求項1に記載のシート材容器。
- 前記複数の基材フィルムは、いずれも9μm以上の厚さである、請求項1または2に記載のシート材容器。
- 前記複数の基材フィルムは、いずれも50μm以下の厚さである、請求項1~3のいずれか1項に記載のシート材容器。
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