JP2004196343A - Retort-processable self-supporting baglike container - Google Patents

Retort-processable self-supporting baglike container Download PDF

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Publication number
JP2004196343A
JP2004196343A JP2002366095A JP2002366095A JP2004196343A JP 2004196343 A JP2004196343 A JP 2004196343A JP 2002366095 A JP2002366095 A JP 2002366095A JP 2002366095 A JP2002366095 A JP 2002366095A JP 2004196343 A JP2004196343 A JP 2004196343A
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heat
container
self
laminate
resistant
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JP2002366095A
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JP4139681B2 (en
Inventor
Kazuyuki Takazawa
和幸 高澤
Shu Uehara
周 上原
Masahiro Yoshikawa
正浩 吉川
Katsunobu Ito
克伸 伊藤
Yukinobu Yamaguchi
幸伸 山口
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Dai Nippon Printing Co Ltd
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Dai Nippon Printing Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a retort-processable self-supporting baglike container which can be easily manufactured using a conventional bag-making machine or the like, has self-supportability and shape retention, is excellent in protection of contents, is easy to unseal a whole surface of the upper part of the container, and is excellent in design effects by printing or the like. <P>SOLUTION: The retort-processable self-supporting baglike container has its barrel formed by heat-sealing both side rims of front and rear wall laminates 50 via side seals. The bottom is formed in a gusset form by folding and inserting a bottom laminate 60 between lower parts of the front and rear wall laminates and heat-sealing. The retort-processable self-supporting baglike container has its front and rear wall laminates made of a laminate including an outer heat-resistant/water-resistant resin layer, cardboard of a metric weighing capacity of 70 to 280 g/m<SP>2</SP>and a gas barrier layer of an intermediate layer, and the innermost heat-resistant thermally adhesive resin layer. The bottom laminate is made of a laminate including an outer heat-resistant/water-resistant layer, a gas barrier layer of an intermediate layer and the innermost heat-resistant thermally adhesive resin layer. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【0001】
【発明の属する技術分野】
本発明は、レトルト処理可能な自立性袋状の容器に関し、更に詳しくは、底部をガセット形式で形成する自立性袋と同様な形式の自立性袋状の容器であって、容器胴部の剛性、保形性を高め、内容物の保護性を向上させたレトルト処理可能な自立性袋状の容器に関する。
【0002】
【従来の技術】
従来、内容物を密封包装し、レトルト殺菌処理を施す自立性袋状容器としては、通常、耐熱性および耐水性に優れた積層フィルムを用いてスタンディングパウチ形式に製袋した自立性袋が使用されていた。
このような自立性袋は、底部がガセット形式で形成されるので立体容器の特性を有し、内容物をコンパクトに包装できると共に、自立性に優れ、その取り扱いも容易に行えることから、広範囲の内容物の包装用に使用され、レトルト殺菌処理を施す内容物の分野でも広く使用されている。
只、このような自立性袋は、上記の特徴のほか、軽量で嵩張らず、使用後の廃棄処理も容易であるなどの長所を有するが、袋の材料が積層フィルムで柔軟性材料であるため、保形性が十分ではなく、内容物が、例えば、レトルトカレーなどの場合、潰れやすい具が含まれており、店頭などで触られると具が潰され、商品価値が損なわれる問題があった。
【0003】
このような問題点を解消できる容器として、例えば、ブリックタイプなどの保形性を有する箱型容器でオートクレーブなどによる加熱殺菌処理が可能な紙基材などの容器が開発されている。
具体的には、「厚紙および紙に基づく包装用ラミネート」として、少なくとも中間層に紙または厚紙などの液体を吸収する材料を基層として用い、その外側と内側に外側コーティングと内側コーティングを積層したシートまたはウェブの形のラミネート・タイプの材料で形成され、その少なくとも一方の側において、85℃またはそれ以上の温度において湿気のある雰囲気中で熱処理される折り畳まれた防湿性かつ耐熱性の容器が提案されている(例えば、特許文献1参照)。
【0004】
また、「食品の貯蔵寿命を延ばす方法および包装」として、両面が熱封緘性を有する積層包装材料を用い、最終的にブリックタイプの容器に仕上げられる容器で、内容物のオートクレーブによる殺菌を短時間で効率的に行うため、一旦、比較的偏平な形態に内容物を密封包装して殺菌処理を行い、その後、平行六面体の形(ブリックタイプ)に成形する方法と包装体が提案されている(例えば、特許文献2)。
【0005】
【特許文献1】
特表平11−508502号公報(第2〜5頁、第1図)
【特許文献2】
特表平11−508858号公報(第2〜4頁、第1〜5図)
【0006】
【発明が解決しようとする課題】
しかしながら、前記のような中間層に紙または厚紙などを積層した積層材料による箱型容器は、いずれも保形性を有し、且つオートクレーブなどによる加熱殺菌処理が可能であるが、容器の上部も立体構造であるため、容器上部の全面開封が難しく、液状の内容物には適するが、固形物を含む内容物には適さない問題があった。また、容器の成形と内容物の充填シールがインライン化された専用の成形・充填シール装置、または専用の充填シール装置などを必要とするため、その設備費が高価であり、長期使用の目処がつかない限り、その採用が難しい問題があった。
【0007】
本発明は前記のような種々の問題点を解決するためになされたものであり、その目的とするところは、安価な材料で製造でき、且つ、容器の作製や充填シール装置などに特別な装置を必要とせず、従来の装置を用いて容易に製造することができ、また、容器が自立性と適度の剛性、即ち、保形性を有すると共に、レトルト処理も可能で、内容物が潰れやすいものを含むものであっても安全に保護することができ、更に、容器上部の全面開封も容易で、容器の印刷などによる意匠効果も向上できるという性能、使用適性と共に、経済性にも優れた自立性袋状の容器を生産性よく提供することにある。
【0008】
【課題を解決するための手段】
上記の課題は、以下の本発明により解決することができる。
即ち、請求項1に記載した発明は、積層体を袋状にヒートシールして形成される自立性袋状の容器であって、該容器の胴部が、前後の壁面用積層体の両側端縁部を側部シール部でヒートシールして形成され、底部が、前後の壁面用積層体の下部の間に底面用積層体を内側に折り返して挿入し、ヒートシールしてなるガセット部を有する形式で形成され、且つ、前後の壁面用積層体が、少なくとも外側の耐熱性・耐水性樹脂層と、中間層の米坪量70〜280g/m2 の厚紙、およびガスバリヤー層と、最内層の耐熱性熱接着性樹脂層とを含む積層体で形成され、また、底面用積層体が、少なくとも外側の耐熱性・耐水性樹脂層と、中間層のガスバリヤー層と、最内層の耐熱性熱接着性樹脂層とを含む積層体で形成されていることを特徴とするレトルト処理可能な自立性袋状の容器からなる。
【0009】
本発明において、前記壁面用積層体の中間層に積層する厚紙は、主に、積層体の剛性を適度に高め、自立性袋状の容器の保形性を向上させるために積層するものであり、その米坪量は70〜280g/m2 の範囲であることが好ましい。米坪量が70g/m2 未満の場合は、積層体の剛性の向上効果を十分に得られず、容器の保形性が不十分となるため好ましくない。また、米坪量が280g/m2 を超える場合は、積層体の剛性が強くなりすぎて、容器の開口性が悪くなると共に、厚紙の厚みも大きくなり、厚紙の端面から水分が浸透しやすくなるため好ましくない。この点では厚紙は、強サイズ度の厚紙であることが好ましく、例えば、コップ原紙やミルクカートン原紙などを好適に使用することができる。
【0010】
前記壁面用積層体および底面用積層体の外側の耐熱性・耐水性樹脂層は、レトルト殺菌処理やヒートシールの際の熱に耐える程度の耐熱性と、外側からの水分の浸透を防止する耐水性を有する樹脂であれば、特に限定はされず、適宜に選定して使用することができる。具体例として、例えば、ポリエチレンテレフタレートなどのポリエステルのほか、各種ナイロンなどのポリアミド、ポリプロピレンなどの一軸または二軸延伸フィルムを好適に使用することができる。これらは単独で使用してもよく、また、複数を貼り合わせて使用してもよい。
【0011】
また、前記壁面用積層体および底面用積層体の中間層に積層するガスバリヤー層は、アルミニウム箔などの金属箔のほか、アルミニウムなどの金属、またはシリカ、アルミナ、酸化亜鉛、酸化錫、酸化マグネシウムなどの無機酸化物の蒸着層を延伸ポリエチレンテレフタレートフィルムなどのポリエステルフィルムや、延伸ナイロンフィルムなどのポリアミドフィルムなどに設けた蒸着フィルム、或いはエチレン−ビニルアルコール共重合体フィルム、ポリ塩化ビニリデンフィルム、ポリアクリロニトリルフィルム、MXD6(ポリメタキシリレンアジパミド)の延伸フィルムなどのガスバリヤー性フィルムを使用することができ、これらの中から適宜選択して使用することができる。
【0012】
前記金属または無機酸化物の蒸着層は、真空蒸着法、スパッタリング法、イオンプレーティング法などのPVD法、或いはプラズマ化学気相成長法、熱化学気相成長法などのCVD法により基材フィルム上に形成することができ、その厚みは100〜1000Åの範囲が適当である。
このような金属または無機酸化物の蒸着層は、単独の層で形成してもよいが、複数の層で形成することもでき、それによりガスバリヤー性を一層向上させることができる。
また、前記金属または無機酸化物の蒸着層は、その接着性を向上させ、或いは亀裂などの損傷を防止して優れたガスバリヤー性を有効に発揮させるため、その上下の面に接着性向上層、保護層、ガスバリヤー性向上層などの目的で、反応型アクリル系樹脂、ポリウレタン系樹脂、シランカップリング剤を含有させたアクリル系樹脂、金属アルコキシドを含有させた水溶性高分子、エチレン−ビニルアルコール共重合体などの樹脂層を設けて複合層としてガスバリヤー層を形成することもできる。
【0013】
前記壁面用積層体と底面用積層体の最内層の耐熱性熱接着性樹脂層は、自己同士および相互間でヒートシール可能な熱接着性を有すると同時に、レトルト殺菌処理に耐える耐熱性を有することが必要である。
このような耐熱性熱接着性樹脂層としては、ポリプロピレン、プロピレン−エチレン共重合体(エチレン含有量が10モル%以下の共重合体)、或いは、ポリプロピレンに不飽和カルボン酸、不飽和カルボン酸無水物またはエステル単量体などをグラフト重合または共重合したポリプロピレン系樹脂、中密度ポリエチレン、高密度ポリエチレンなどの無延伸フィルム、またはこれらの樹脂を押し出しコートした樹脂層を使用することができる。
只、セミレトルト処理と呼ばれる温度条件を下げた加熱条件で処理される場合は、上記のほか、直鎖状低密度ポリエチレン(以下、LLDPEと記載する)や非晶性ポリエステルなども使用することができる。
【0014】
前記プロピレン−エチレン共重合体は、エチレン含有量を10モル%以下、例えば5〜10モル%の範囲とすることにより、ポリプロピレンの耐熱性や剛性などの長所をそれほど損なうことなく、押し出し加工適性、ヒートシール適性、および低温時の衝撃強さなどを向上させることができる。
また、前記ポリプロピレン系樹脂で、ポリプロピレンに不飽和カルボン酸、不飽和カルボン酸無水物またはエステル単量体などをグラフト重合する場合、グラフト成分の具体例としては、アクリル酸、メタアクリル酸、メタクリル酸グリシジル、アクリル酸2−ヒドロキシエチル、メタクリル酸2−ヒドロキシエチル、マレイン酸ジエチル、マレイン酸モノエチル、マレイン酸ジ−n−ブチル、マレイン酸、マレイン酸無水物、フマル酸、イタコン酸、イタコン酸無水物、5−ノルボルネン−2,3−無水物、シトラコン酸、シトラコン酸無水物、クロトン酸、クロトン酸無水物、アクリロニトリル、メタクリロニトリル、アクリル酸ナトリウム、アクリル酸カルシウム、アクリル酸マグネシウムなどが挙げられる。これらの中でも、コストおよびグラフト重合の容易さなどから無水マレイン酸をポリプロピレンにグラフト重合したポリプロピレン系樹脂を特に好ましく使用することができる。
【0015】
前記のような構成を採ることにより、以下に列挙するような作用効果を得ることができる。
(1)本発明のレトルト処理可能な自立性袋状の容器は、胴部が前後の壁面用積層体の両側端縁部を側部シール部でヒートシールして形成されると共に、底部が底面用積層体を用いてガセット部を設けた形式で形成されているので、内容物が充填された容器は、底部が前後に大きく広がり立体構造を形成し、自立性が付与されると共に、容量の割にコンパクトに包装することができる。
(2)前後の壁面用積層体は、少なくとも外側の耐熱性・耐水性樹脂層と、中間層の米坪量70〜280g/m2 の厚紙、およびガスバリヤー層と、最内層の耐熱性熱接着性樹脂層とを含む積層体で形成され、また、底面用積層体は、少なくとも外側の耐熱性・耐水性樹脂層と、中間層のガスバリヤー層と、最内層の耐熱性熱接着性樹脂層とを含む積層体で形成されているので、容器はレトルト殺菌処理に耐える耐熱性、耐水性を有すると共に、ガスバリヤー性を有し、食品等の内容物の保存性を向上させることができる。
(3)容器の胴部を形成する前後の壁面用積層体には、中間層に前記厚紙が積層されているので適度の剛性が付与され、容器の保形性が向上し、内容物が潰れやすいものを含む場合でも、それを保護することができる。また、容器の下部においては、底面の外周にヒートシール部により形成される脚部の剛性も高められるため、容器の自立性が一層向上される。
(4)また、中間層の前記厚紙の外面または外側の耐熱性・耐水性樹脂層の内面に印刷による絵柄などのデザインを施すことにより、厚紙の白さにより印刷効果が高められ、容器の意匠性を一層向上させることができる。
【0016】
請求項2に記載した発明は、前記中間層の米坪量70〜280g/m2 の厚紙のステキヒト・サイズ度が、400秒以上であることを特徴とする請求項1記載の自立性袋状の容器からなる。
上記ステキヒト・サイズ度は、JIS P8122 紙のステキヒト・サイズ度試験方法に準じて測定した値である。
【0017】
前記中間層の米坪量70〜280g/m2 の厚紙のステキヒト・サイズ度は、400秒以上であることが内容物充填後のレトルト処理を一層安全に行える点で好ましく、上限は特に問わないが、経済性および技術面から1200秒程度までが適当である。
厚紙のステキヒト・サイズ度が400秒未満の場合は、耐水度が不足し、レトルト処理の際、厚紙の端面から水分を吸収しやすくなり、容器の剛性を低下させるため好ましくない。
【0018】
従って、前記のような構成を採ることにより、請求項1に記載した発明の作用効果に加えて、容器の壁面用積層体の中間層に積層された厚紙の耐水度が向上されるので、内容物を充填した自立性袋状の容器をレトルト処理する際、厚紙の端面からの水分の浸透を一層少なくすることができ、一層安全にレトルト処理することができる。
【0019】
請求項3に記載した発明は、前記容器の底部のガセット部が、内側の中央部が低く、両側端部に向かって高くなる船底形のシールパターンでヒートシールされていることを特徴とする請求項1または2に記載の自立性袋状の容器からなる。
【0020】
前記自立性袋状の容器の底部のガセット部をヒートシールする船底形のシールパターンは、内側の中央部が低く、両側端部に向かって高くなる形状であれば、特に限定はされないが、特に好ましい形状として、内側が円弧状などの湾曲線で形成される船底形のシールパターン、或いは、内側が所定幅の底部から両側が外側に傾斜を持って直線状に立ち上がる形状の船底形のシールパターンを挙げることができる。
【0021】
このような構成を採ることにより、請求項1または2に記載した発明の作用効果に加えて、内容物を充填した自立性袋状の容器は、その底部が、前記船底形のシールパターンに応じて、例えば、内側が湾曲線で形成される船底形のシールパターンの場合は楕円形状に、また、内側が所定幅の底部から両側が外側に傾斜を持って直線状に立ち上がる形状の船底形のシールパターンの場合は六角形状に広がり、いずれも中央部が前後に大きく広げられ、また、底面の外周にはヒートシール部による脚部が確実に形成されるため、容器の自立性を一層向上させることができる。
【0022】
請求項4に記載した発明は、前記容器の上部に開封手段が設けられていることを特徴とする請求項1乃至3のいずれかに記載の自立性袋状の容器からなる。
【0023】
前記開封手段は、印刷で表示された切り取り線などの開封指示線や開封指示マークであってもよく、また、実際の引き裂きによる開封操作を容易にする以下のような易開封性手段であってもよい。更に、これらの複数を適宜組み合わせて設けたものであってもよい。
【0024】
上記易開封性手段としては、例えば、通常のパウチでも多用されるノッチを設ける方法のほか、レーザー光照射などによるハーフカット線を設ける方法、或いは、容器の壁面用積層体中に易引き裂き性の一軸延伸フィルムを積層する方法(この場合、一軸延伸フィルムは、その延伸方向が容器の開封方向と一致するように積層する)などがあり、これらは単独で用いてもよく、また、例えばノッチと、ハーフカット線または一軸延伸フィルムの積層などのように複数の手段を適宜組み合わせて用いることができる。
前記ノッチは、通常、一字形やV字形などのノッチが使用されているが、形状は特に限定されず、切り取り方向に鋭角部分を有する形状であれば何でも使用することができる。
前記ハーフカット線を設ける場合も、直線状のハーフカット線に限らず、ミシン目状などの断続的なハーフカット線で設けることもできる。更に、このようなハーフカット線は、1本でもよいが、引き裂き方向がずれた場合を想定して、中心のハーフカット線の両側に各1本または各2本など、複数のハーフカット線を平行に、または中心のハーフカット線に収斂するように設けることもできる。
【0025】
このような構成を採ることにより、請求項1乃至3のいずれかに記載した発明の作用効果に加えて、容器に充填された内容物を取り出す際、容器の上部の開封位置に、容器の開封を容易にするための開封手段が設けられているので、開封位置を間違えることがなく、一層容易に容器の上部全体を切り取って開封することができる。また、内容物が液状物などと共に、固形物を含むものであっても容易に取り出すことができる。
【0026】
【発明の実施の形態】
以下、図面を参照して本発明の実施の形態について説明する。
図1は、本発明のレトルト処理可能な自立性袋状の容器に用いる前後の壁面用積層体の一例の構成を示す模式断面図であり、図2は、本発明のレトルト処理可能な自立性袋状の容器に用いる底面用積層体の一例の構成を示す模式断面図である。
図3は、本発明のレトルト処理可能な自立性袋状の容器の第一の実施例の構成を示す図であり、(イ)はその模式正面図、(ロ)は(イ)に示した自立性袋状の容器のA−A線の模式断面図である。
また、図4、図5は、本発明のレトルト処理可能な自立性袋状の容器の第二、第三の実施例の構成を示す模式正面図である。
但し、本発明は、その要旨を超えない限り、これらの図面に限定されるものではない。
【0027】
図1は、本発明のレトルト処理可能な自立性袋状の容器に用いる前後の壁面用積層体の一例の構成を示す模式断面図であり、図1に示した壁面用積層体50a は、外側(図において上側)から、耐熱性・耐水性樹脂層1a 、中間層の米坪量70〜280g/m2 の厚紙2、およびガスバリヤー層3a 、最内層の耐熱性熱接着性樹脂層4a を、この順に接着層5a 、5b 、5c を介して積層して構成したものである。
また、図2は、本発明のレトルト処理可能な自立性袋状の容器に用いる底面用積層体の一例の構成を示す模式断面図であり、図2に示した底面用積層体60a は、外側(図において上側)から、耐熱性・耐水性樹脂層1b 、中間層のガスバリヤー層3b 、最内層の耐熱性熱接着性樹脂層4b を、この順に接着層5d 、5e を介して積層して構成したものである。
【0028】
上記図1、図2に示した壁面用積層体50a または底面用積層体60a において、外側の耐熱性・耐水性樹脂層1a 、1b 、中間層の米坪量70〜280g/m2 の厚紙2、およびガスバリヤー層3a 、3b 、最内層の耐熱性熱接着性樹脂層4a 、4b については、先に説明したので重複を避けるため、ここでは説明を省略する。
上記各層の積層は、それぞれがフィルム形状で供給される場合は、ドライラミネーション法または押し出しラミネーション法(サンドイッチラミネーション法)などで貼り合わせることができる。
ドライラミネーション法で貼り合わせる場合は、上記各層の間の接着層5a 〜5e には、例えば、二液硬化型ポリウレタン系接着剤など、公知のドライラミネート用接着剤を使用することができる。
また、押し出しラミネーション法で貼り合わせる場合は、上記各層の間の接着層5a 〜5e には、例えば、ポリプロピレン系の熱接着性樹脂、具体例としてポリプロピレン系アドマー〔三井化学(株)製〕などのほか、レトルト処理の条件によっては、エチレン−メタクリル酸共重合体などのエチレン系共重合体を両側の層の間に膜状に溶融押し出して、圧着、冷却する方法で使用することができる。
【0029】
特に、最内層の耐熱性熱接着性樹脂層4a 、4b は、予め製膜した無延伸フィルムを上記の方法で貼り合わせてもよいが、積層面にアンカーコートを施して、その上に押し出しコートして積層することもできる。
中間層のガスバリヤー層3a 、3b として、アルミニウム箔などの金属箔を使用する場合は、折り曲げなどによるクラックの発生を防止するため、更にその内側の面に二軸延伸ポリエチレンテレフタレートフィルムなどの保護層を積層することができる。
また、前記各層をドライラミネーション法または押し出しラミネーション法で積層する場合、その積層面には、必要に応じて、接着性を向上させるため、コロナ放電処理、オゾン処理、アンカーコート、プライマーコートなどの公知の易接着性処理を施すことができる。
特に、中間層の前記厚紙の積層面は接着剤などを吸収しやすいため、必要な場合、目止めを兼ねて、例えば、ポリプロピレン系樹脂などの水分散型のエマルジョンもしくはディスパージョンによる水性アンカーコートなどを施すことができる。
ポリプロピレン系樹脂を用いた水性アンカーコート剤は、耐熱性にも優れており、本発明においては、前記厚紙のサイズ度の向上剤としても好適に使用できるものである。
【0030】
尚、本発明において、壁面用積層体50a には、主に、その剛性を高め、容器の保形性を向上させるために、中間層に前記厚紙2を積層したが、底面用積層体60a に関しては、柔軟性が必要とされるため、特に厚紙を積層する必要はない。只、自立性袋状の容器の底面中央部近辺においては、剛性を高めることにより容器の保形性を向上させるための補助手段にできるので、この部分にパターン状に厚紙を積層することは差し支えない。
また、壁面用積層体50a に、印刷により絵柄などのデザインを施す場合、図には示していないが、外側の耐熱性・耐水性樹脂層1a の内面、またはその内側の米坪量70〜280g/m2 の厚紙2の外面に印刷することが好ましく、それにより、厚紙の白さと不透明性を利用できるので印刷効果が高められ、容器の意匠性を一層向上でき、また、印刷層が外側の耐熱性・耐水性樹脂層1a で保護されるので、外部からの摩擦などに対しても安全である。
【0031】
図3は、本発明のレトルト処理可能な自立性袋状の容器の第一の実施例の構成を示す図であり、(イ)はその模式正面図、(ロ)は(イ)に示した自立性袋状の容器のA−A線の模式断面図である。
図3の(イ)、(ロ)に示したレトルト処理可能な自立性袋状の容器100は、その底部が、前後の壁面用積層体50、50の下部の間に、底面用積層体60を内側に折り返して底面用積層体折り返し部11まで挿入してなるガセット部9を有する形式で形成され、内側に折り込まれた底面用積層体60の両側下端近傍には、この場合、半円形の底面用積層体切り欠き部10a 、10b が設けられており、ガセット部9は、内側が所定幅の底部から両側が外側に傾斜を持って直線状に立ち上がる形状の船底形のシールパターン、即ち、底部シール部7でヒートシールして形成され、胴部が、前後の壁面用積層体50、50の両側の端縁部を側部シール部6a 、6b でヒートシールして形成されている。
【0032】
また、自立性袋状の容器100の上部は、この部分から内容物を充填した後、上部シール部8でヒートシールされるが、上部シール部8の下側には、容器100の開封を容易にする開封手段として、ハーフカット線13と、その一方の端部にノッチ12が設けられて構成されている。
尚、上記前後の壁面用積層体50には、前記図1で説明した構成の壁面用積層体50a を使用することができ、また、上記底面用積層体60には、前記図2で説明した構成の底面用積層体60a を使用することができる。
【0033】
底部のガセット部9をヒートシールする底部シール部7のシールパターンは、図では、より好ましい形状を示すため、内側が所定幅の底部から両側が外側に傾斜を持って直線状に立ち上がる形状の船底形のシールパターンを示したが、底部のガセット部9の外周を所定幅でヒートシールするシールパターンであってもよい。只、その場合でも、容器の自立性を一層よくするため、内側に折り込まれた底面用積層体60の両側下端近傍には、類似した形状の底面用積層体切り欠き部10a 、10b を設け、その部分が上記所定幅のシールパターンでヒートシールされるように構成することが好ましい。
【0034】
このような構成を採ることにより、内容物の充填は、例えば、従来のスタンディングパウチ用の充填機を利用して、自立性袋状の容器100の上部の開口部から容易に充填し、充填後、上部シール部8を脱気シールなどの方法でヒートシールして密封することができる。
内容物が充填された容器100は、底部が六角形状をなして前後に大きく広がり立体構造を採るので、容量の割にコンパクトに包装することができ、また、底面の外周にはヒートシール部による脚部が確実に形成されると共に、前後の壁面用積層体50は、その中間層に米坪量70〜280g/m2 の厚紙2が積層され、剛性が高められているので、容器の自立性と保形性が向上され、内容物が、潰れやすい固形物を含む食品などの場合でも、それを安全に保護することができる。
【0035】
また、自立性袋状の容器100は、前後の壁面用積層体50が、少なくとも外側から、耐熱性・耐水性樹脂層1a 、前記厚紙2、ガスバリヤー層3a 、耐熱性熱接着性樹脂層4a が、接着層5a 、5b 、5c を介して順に積層されて構成され、また、底面用積層体60が、少なくとも外側から、耐熱性・耐水性樹脂層1b 、ガスバリヤー層3b 、耐熱性熱接着性樹脂層4b が、接着層5d 、5e を介して順に積層されて構成されているので、全体としてレトルト殺菌処理に耐える耐熱性と耐水性を有すると同時にガスバリヤー性にも優れており、内容物の長期保存性にも優れている。
【0036】
そして、自立性袋状の容器100に充填された内容物を取り出す際には、上部シール部8の下側に、容器100の開封を容易にする開封手段として、ハーフカット線13と、その一方の端部にノッチ12が設けられているので、鋏などの道具を使用することなく、ノッチ12を起点としてハーフカット線13に沿って容易に手で引き裂いて容器100の上部全体を開封することができる。従って、内容物が、液状物と共に固形物を含む場合でも容易に取り出すことができる。
更に、自立性袋状の容器100に、印刷による絵柄などのデザインを施す場合も、前後の壁面用積層体50の外側の耐熱性・耐水性樹脂層1a の内面、または前記厚紙2の外面に印刷することにより、前記厚紙2の白さと不透明性を利用できるため、印刷効果が高められ、容器100の意匠性を一層向上させることができる。
【0037】
図4は、本発明のレトルト処理可能な自立性袋状の容器の第二の実施例の構成を示す模式正面図であり、図4に示した自立性袋状の容器200は、前記図3に示した自立性袋状の容器100の構成において、底部のガセット部9をヒートシールする底部シール部7のシールパターンのみを、内側が円弧状の湾曲線で形成される船底形のシールパターンに変更して構成したものであり、その他の構成は、全て前記図3に示した自立性袋状の容器100と同様に形成して構成したものである。
【0038】
このような構成を採ることにより、前記図3に示した自立性袋状の容器100と比較して、内容物充填後の容器200の底部の広がり形状が、六角形状から楕円形状に変わるが、自立性袋状の容器200の自立性、保形性に関しては、殆ど変わらず、図3に示した自立性袋状の容器100と同様に優れており、また、その他の構成は同一であるため、前記図3に示した自立性袋状の容器100で説明した作用効果と同様な作用効果を得ることができる。
【0039】
次に、図5は、本発明のレトルト処理可能な自立性袋状の容器の第三の実施例の構成を示す模式正面図である。図5に示した自立性袋状の容器300は、前記図3に示した自立性袋状の容器100の構成において、容器300の保形性を一層向上させるため、前後の壁面を形成する壁面用積層体50、50の中央部の両側に、底部シール部7の船底形のシールパターンの所定幅の底部の両端、即ち、両側が外側に傾斜を持って直線状に立ち上がる部分の基部近傍から上方に向けて、容器胴部のやや上寄りの位置まで、2本ずつの押し罫14、14(背面側は図示せず)を追加して設けて構成したものであり、その他の構成は、全て前記図3に示した自立性袋状の容器100と同様に形成して構成したものである。
【0040】
このような構成を採ることにより、自立性袋状の容器300は、前記図3に示した自立性袋状の容器100の構成に加えて、前後の壁面用積層体50、50に、それぞれ前記2本ずつの押し罫14、14が設けられているので、前記図3に示した自立性袋状の容器100で説明した作用効果に加えて、容器300に内容物が充填された時、底部が前後に六角形状に広げられると共に、その上の胴部も前後4本の押し罫14が折れ曲がって広がるので、容器胴部が安定した六角柱状になり、容器300の保形性を一層向上させることができる。
【0041】
以上のような本発明のレトルト処理可能な自立性袋状の容器は、その本体部が、通常のスタンディングパウチと同様に、底部をガセット形式で形成して自立性を付与した形態であるため、基本的には、従来のスタンディングパウチ用の製袋機を利用して製造することができる。そして、必要に応じて、底部のガセット部をヒートシールする熱板などのシールヘッドの形状を変更すると共に、容器の上部に開封手段として、ハーフカット線やノッチを設ける場合は、例えば、レーザー光照射装置や打ち抜き装置などをスタンディングパウチ用の製袋機に追加付設し、また、前後の壁面用積層体に押し罫を設ける場合は、その熱プレス装置またはエンボス装置などを追加付設することにより、いずれも容易に製造することができる。
【0042】
【実施例】
次に、本発明のレトルト処理可能な自立性袋状の容器について、実施例を示して更に具体的に説明する。
【0043】
(実施例1)
図3に示した構成のレトルト処理可能な自立性袋状の容器を作製することとし、前後の壁面用積層体50として、外側から、二軸延伸ポリエチレンテレフタレートフィルム(以下、PETフィルムと記載する)(厚み12μm)/接着層1/多色グラビア印刷層・コップ原紙(米坪量150g/m2 )/接着層2/アルミニウム箔(厚み6μm)/接着層3/PETフィルム(厚み12μm)/接着層4/無延伸ポリプロピレンフィルム(以下、CPPフィルムと記載する)(厚み60μm)の順に積層した積層体を用い、また、底面用積層体60には、外側から、PETフィルム(厚み12μm)/接着層5/二軸延伸ナイロンフィルム(以下、ONフィルムと記載する)(厚み15μm)/接着層6/アルミニウム箔(厚み9μm)/接着層7/PETフィルム(厚み12μm)/接着層8/CPPフィルム(厚み60μm)の順に積層した積層体を用いて、スタンディングパウチ用製袋機を使用し、これにハーフカット線13とノッチ12を設けるためめのレーザー光照射装置と打ち抜き装置を取り付けて、図3に示した構成で、外形寸法が幅130mm、長さ190mmで、ガセット部9の長さが40mmとなるように加工して、実施例1の自立性袋状の容器を作製した。
【0044】
尚、上記壁面用積層体50と底面用積層体60の構成において、接着層1〜8のうち、接着層2の部分、即ち、コップ原紙とアルミニウム箔の貼り合わせのみを、接着層2にエチレン−メタクリル酸共重合体(厚み15μm)を用いて押し出しラミネーション法で貼り合わせたほかは、全て二液硬化型ポリウレタン系接着剤を用いて、ドライラミネーション法で貼り合わせたものである。
また、容器上部のハーフカット線13は、外側からPETフィルム(厚み12μm)の全層とコップ原紙(米坪量150g/m2 )の1/2程度の厚みまでがカットされるように設けた。
【0045】
(実施例2)
前記実施例1の自立性袋状の容器の構成において、壁面用積層体50と底面用積層体60の中間層のアルミニウム箔(厚み6μm)とその内側に保護層として貼り合わせたPETフィルム(厚み12μm)とを、アルミニウムを厚み400Åに蒸着したPETフィルム(厚み12μm)に代えて積層し、壁面用積層体50と底面用積層体60を作製したほかは、全て実施例1と同様に加工して実施例2の自立性袋状の容器を作製した。
【0046】
(比較例1)
前記実施例1の自立性袋状の容器の構成において、壁面用積層体50の中間層に積層した表面に多色グラビア印刷層を設けたコップ原紙(米坪量150g/m2 )を取り除き、印刷層は、外側のPETフィルム(厚み12μm)の内面に同様なデザインの多色グラビア印刷層を裏刷り方式で設けて、そのPETフィルムの印刷層面とアルミニウム箔(厚み6μm)とをドライラミネーション法で貼り合わせたほかは、全て実施例1と同様に加工して比較例1の自立性袋状の容器を作製した。
この場合、ハーフカット線13は、外側のPETフィルム(厚み12μm)の全層がカットされるように設けたものである。
【0047】
(比較例2)
前記実施例1の自立性袋状の容器の構成において、壁面用積層体50と底面用積層体60の最内層に用いたCPPフィルム(厚み60μm)を、いずれも低密度ポリエチレンフィルム(以下、LDPEフィルムと記載する)(厚み60μm)に変更して貼り合わせたほかは、全て実施例1と同様に加工して比較例2の自立性袋状の容器を作製した。
【0048】
〔試験およびその結果〕
以上のように作製した実施例1、2、および比較例1、2の自立性袋状の容器について、そのレトルト処理適性を評価するため、以下のようにレトルト殺菌処理の試験を行うと共に、容器の保形性、自立性、開封性、印刷効果についても比較評価した。
【0049】
レトルト殺菌処理適性の試験
実施例1、2、および比較例1、2の自立性袋状の容器を試料として、それぞれに内容物として、レトルト用カレー(具入り)を充填し、上部シール部8を脱気シールして密封した後、蒸気式のレトルト釜を用いて、温度120℃、圧力1.5×105 Pa、時間30分間の条件で加圧加熱殺菌し、空冷を主とする冷却を行った後、レトルト釜から取り出し、容器のシール漏れの有無、外観の劣化、厚紙のふやけ現象の有無などを調べてレトルト処理適性を評価した。
【0050】
上記レトルト殺菌処理を行った結果、実施例1、2の自立性袋状の容器は、いずれもシール漏れや外観の劣化がなく、また、厚紙のふやけ現象も殆どなく、良好な耐熱性、耐水性などレトルト処理適性を備えていた。また、容器の保形性、自立性、印刷効果についても、厚紙による剛性の向上と白さおよび不透明性の付与があり、優れていた。更に、容器の開封性に関しても、この場合、開封手段として、ノッチ12とハーフカット線13が設けられているので、容器の上部シール部8を容易に手で切り取って上部全体を開封することができ、開封性も良好であった。
【0051】
これに対して、比較例1の自立性袋状の容器は、壁面用積層体50の中間層に厚紙を積層していないので、剛性が低く保形性に劣り、レトルト処理によりカールなども生じやすく、手で揉まれやすいため内容物の保護性に欠け、また、自立性や印刷効果の点でもやや劣っていた。
また、比較例2の自立性袋状の容器は、壁面用積層体50の中間層に厚紙を積層しているので剛性が高められ、保形性や自立性に優れているが、壁面用積層体50と底面用積層体60の最内層のシーラント層がLDPEであるため、一般用途向けの容器としては優れるものの、レトルト殺菌処理用の容器としては耐熱性が不足し、前記レトルト殺菌処理でシール漏れを発生し好ましくなかった。
【0052】
【発明の効果】
以上の説明で明らかなように、本発明によれば、安価な材料で製造でき、且つ、容器の作製や充填シール装置などに特別な装置を必要とせず、従来の装置を利用して容易に製造することができ、また、容器が優れた自立性と適度の剛性、即ち、保形性を有すると共に、レトルト殺菌処理に耐える耐熱性および耐水性を備え、内容物が潰れやすいものを含むものであっても安全に保護することができ、更に、容器上部の全面開封も容易で、容器の印刷などによる意匠効果も向上できるという性能、使用適性と共に、経済性にも優れた自立性袋状の容器を生産性よく提供できる効果を奏する。
【図面の簡単な説明】
【図1】本発明のレトルト処理可能な自立性袋状の容器に用いる前後の壁面用積層体の一例の構成を示す模式断面図である。
【図2】本発明のレトルト処理可能な自立性袋状の容器に用いる底面用積層体の一例の構成を示す模式断面図である。
【図3】本発明のレトルト処理可能な自立性袋状の容器の第一の実施例の構成を示す図であり、(イ)はその模式正面図、(ロ)は(イ)に示した自立性袋状の容器のA−A線の模式断面図である。
【図4】本発明のレトルト処理可能な自立性袋状の容器の第二の実施例の構成を示す模式正面図である。
【図5】本発明のレトルト処理可能な自立性袋状の容器の第三の実施例の構成を示す模式正面図である。
【符号の説明】
1a 、1b 耐熱性・耐水性樹脂層
2 厚紙
3a 、3b ガスバリヤー層
4a 、4b 耐熱性熱接着性樹脂層
5a 、5b 、5c 、5d 、5e 接着層
6a 、6b 側部シール部
7 底部シール部
8 上部シール部
9 ガセット部
10a 、10b 底面用積層体切り欠き部
11 底面用積層体折り返し部
12 ノッチ
13 ハーフカット線
14 押し罫
50、50a 壁面用積層体
60、60a 底面用積層体
100、200、300 自立性袋状の容器
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a self-supporting bag-shaped container capable of being retorted, and more particularly, to a self-standing bag-shaped container having a bottom portion formed in a gusset type and having the same shape as a self-supporting bag having a rigid body. The present invention relates to a self-supporting bag-like container capable of retorting and having improved shape retention and improved protection of contents.
[0002]
[Prior art]
Conventionally, as a self-supporting bag-shaped container in which contents are hermetically sealed and subjected to a retort sterilization treatment, a self-supporting bag formed in a standing pouch form using a laminated film having excellent heat resistance and water resistance is usually used. I was
Since such a self-supporting bag has the characteristics of a three-dimensional container because the bottom is formed in a gusset form, it can pack contents in a compact manner, has excellent self-supporting properties, and can be easily handled. It is used for packaging contents and is widely used in the field of contents to be subjected to a retort sterilization treatment.
However, such a self-supporting bag has advantages such as light weight, not bulky, and easy disposal after use, in addition to the above characteristics, but since the bag material is a laminated film and a flexible material. In the case where the shape retention is not sufficient and the contents are, for example, retort curry, etc., there is a problem that a tool that is easily crushed is included, and when touched at a store or the like, the tool is crushed and the commercial value is deteriorated. .
[0003]
As a container capable of solving such a problem, for example, a container such as a paper substrate which is a box-type container having a shape retaining property such as a brick type and which can be subjected to a heat sterilization treatment by an autoclave or the like has been developed.
Specifically, as a `` laminate for packaging based on cardboard and paper '', a sheet in which a material that absorbs liquid such as paper or cardboard is used as a base layer for at least the intermediate layer, and an outer coating and an inner coating are laminated on the outside and inside thereof Or a folded moisture-proof and heat-resistant container which is formed of a laminate-type material in the form of a web and on at least one side thereof is heat-treated in a humid atmosphere at a temperature of 85 ° C. or higher is proposed. (For example, see Patent Document 1).
[0004]
In addition, as a "method and package for extending the shelf life of food", a laminated packaging material having heat sealing properties on both sides is used, and finally the container is finished in a brick type container. In order to perform the process efficiently, a method and a package have been proposed in which the contents are once sealed and packaged in a relatively flat form, sterilized, and then formed into a parallelepiped (brick type) ( For example, Patent Document 2).
[0005]
[Patent Document 1]
Japanese Patent Publication No. 11-508502 (pages 2 to 5, FIG. 1)
[Patent Document 2]
Japanese Unexamined Patent Publication No. 11-508858 (pages 2 to 4, FIGS. 1 to 5)
[0006]
[Problems to be solved by the invention]
However, a box-shaped container made of a laminated material in which paper or cardboard is stacked on the intermediate layer as described above has a shape-retaining property, and can be subjected to heat sterilization by an autoclave or the like. Due to the three-dimensional structure, it is difficult to open the entire surface of the upper part of the container, which is suitable for liquid contents, but not suitable for contents containing solid matter. In addition, since a dedicated molding / filling seal device in which the molding of the container and the filling seal of the contents are inlined or a dedicated filling / sealing device is required, the equipment cost is high, and the prospect of long-term use is high. There was a problem that it was difficult to adopt unless it was connected.
[0007]
The present invention has been made in order to solve the above-mentioned various problems, and an object of the present invention is to manufacture a container with an inexpensive material and to use a special device for producing a container, a filling and sealing device, and the like. Can be easily manufactured using conventional equipment, and the container has self-sustainability and moderate rigidity, i.e., has shape retention, can be retorted, and its contents are easily crushed. It can be safely protected even if it contains a substance, and furthermore, it is easy to open the entire surface of the upper part of the container, and the design effect by printing the container can be improved. It is to provide a self-supporting bag-shaped container with high productivity.
[0008]
[Means for Solving the Problems]
The above problem can be solved by the present invention described below.
That is, the invention described in claim 1 is a self-supporting bag-shaped container formed by heat-sealing the laminate in a bag shape, wherein the body portion of the container has both side edges of the front and rear wall laminate. The edge portion is formed by heat sealing with a side seal portion, and the bottom portion has a gusset portion formed by folding and inserting the bottom laminate to the inside between the lower portions of the front and rear wall laminate and heat sealing. The laminate for the front and rear wall surfaces is formed in the form of at least the outer heat-resistant and water-resistant resin layer, and the intermediate layer has a basis weight of 70 to 280 g / m. Two Cardboard, and a gas barrier layer, and a laminate including an innermost heat-resistant heat-adhesive resin layer, and the bottom laminate is at least an outer heat-resistant and water-resistant resin layer, and an intermediate layer. And a self-supporting bag-like container capable of retort processing, characterized by being formed of a laminate including a gas barrier layer of (1) and an innermost heat-resistant heat-adhesive resin layer.
[0009]
In the present invention, the cardboard laminated on the intermediate layer of the laminate for a wall is mainly laminated to appropriately increase the rigidity of the laminate and improve the shape retention of a self-supporting bag-shaped container. , Its rice basis weight is 70-280g / m Two Is preferably within the range. Rice basis weight 70g / m Two If the ratio is less than the above range, the effect of improving the rigidity of the laminate cannot be sufficiently obtained, and the shape retention of the container becomes insufficient. In addition, rice basis weight is 280 g / m Two If it exceeds, the rigidity of the laminate becomes too strong, and the opening property of the container is deteriorated, and the thickness of the cardboard becomes large, so that moisture easily penetrates from the end face of the cardboard, which is not preferable. In this respect, the cardboard is preferably a cardboard having a high degree of size, and for example, a cup base paper or a milk carton base paper can be suitably used.
[0010]
The heat-resistant and water-resistant resin layer outside the wall laminate and the bottom laminate is heat-resistant enough to withstand heat during retort sterilization and heat sealing, and water-resistant to prevent penetration of moisture from the outside. The resin is not particularly limited as long as it has properties, and can be appropriately selected and used. As a specific example, for example, in addition to polyester such as polyethylene terephthalate, a uniaxial or biaxially stretched film such as polyamide such as various nylons or polypropylene can be suitably used. These may be used alone, or a plurality of them may be used together.
[0011]
Further, the gas barrier layer laminated on the intermediate layer of the wall laminate and the bottom laminate may be a metal foil such as an aluminum foil, a metal such as aluminum, or silica, alumina, zinc oxide, tin oxide, or magnesium oxide. An evaporated layer of an inorganic oxide such as a polyester film such as a stretched polyethylene terephthalate film or a polyamide film such as a stretched nylon film, or an evaporated film provided with an ethylene-vinyl alcohol copolymer film, a polyvinylidene chloride film, or a polyacrylonitrile. A gas barrier film such as a film or a stretched film of MXD6 (polymetaxylylene adipamide) can be used, and it can be appropriately selected from these and used.
[0012]
The deposited layer of the metal or the inorganic oxide is formed on the substrate film by a PVD method such as a vacuum deposition method, a sputtering method, an ion plating method, or a CVD method such as a plasma chemical vapor deposition method or a thermal chemical vapor deposition method. The thickness is suitably in the range of 100 to 1000 °.
Such a metal or inorganic oxide deposition layer may be formed as a single layer, or may be formed as a plurality of layers, whereby the gas barrier properties can be further improved.
In addition, the metal or inorganic oxide vapor-deposited layer is provided with an adhesion-improving layer on the upper and lower surfaces thereof in order to improve its adhesion or effectively exhibit excellent gas barrier properties by preventing damage such as cracks. Acrylic resin containing a reactive acrylic resin, polyurethane resin, acrylic resin containing a silane coupling agent, water-soluble polymer containing a metal alkoxide, ethylene-vinyl, for the purpose of a protective layer, a gas barrier property improving layer, etc. A gas barrier layer can also be formed as a composite layer by providing a resin layer such as an alcohol copolymer.
[0013]
The heat-resistant heat-adhesive resin layer of the innermost layer of the laminate for the wall surface and the laminate for the bottom surface has a heat-adhesive property capable of heat-sealing between itself and each other, and has heat resistance to withstand retort sterilization treatment. It is necessary.
As such a heat-resistant heat-adhesive resin layer, polypropylene, a propylene-ethylene copolymer (a copolymer having an ethylene content of 10 mol% or less), or an unsaturated carboxylic acid, A non-stretched film such as a polypropylene resin obtained by graft polymerization or copolymerization of a product or an ester monomer, a medium-density polyethylene, a high-density polyethylene, or a resin layer formed by extrusion-coating these resins can be used.
However, in the case where the treatment is carried out under a heating condition at a lower temperature condition called semi-retort treatment, in addition to the above, a linear low-density polyethylene (hereinafter, referred to as LLDPE) or an amorphous polyester may be used. it can.
[0014]
The propylene-ethylene copolymer has an ethylene content of 10 mol% or less, for example, in the range of 5 to 10 mol%, so that the advantages such as heat resistance and rigidity of polypropylene are not significantly impaired, and the extrusion processability, The heat sealing suitability, the impact strength at low temperature, and the like can be improved.
In addition, when the unsaturated carboxylic acid, unsaturated carboxylic anhydride or ester monomer or the like is graft-polymerized to polypropylene with the polypropylene resin, specific examples of the graft component include acrylic acid, methacrylic acid, and methacrylic acid. Glycidyl, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, diethyl maleate, monoethyl maleate, di-n-butyl maleate, maleic acid, maleic anhydride, fumaric acid, itaconic acid, itaconic anhydride , 5-norbornene-2,3-anhydride, citraconic acid, citraconic anhydride, crotonic acid, crotonic anhydride, acrylonitrile, methacrylonitrile, sodium acrylate, calcium acrylate, magnesium acrylate and the like. Among them, a polypropylene resin obtained by graft-polymerizing maleic anhydride onto polypropylene can be particularly preferably used in view of cost and ease of graft polymerization.
[0015]
By adopting the above-described configuration, the following functions and effects can be obtained.
(1) The self-supporting bag-shaped container capable of being retorted according to the present invention is formed by heat-sealing both side edges of the front and rear wall laminates with side seal portions, and has a bottom portion at the bottom. Since the container filled with the contents is formed in a form in which a gusset portion is provided using a laminate for use, the bottom portion is greatly expanded back and forth to form a three-dimensional structure, and the self-sustainability is imparted and the capacity is increased. It can be packed relatively compact.
(2) The front and rear wall laminates include at least the outer heat-resistant and water-resistant resin layer and the intermediate layer having a basis weight of 70 to 280 g / m2. Two Cardboard, and a gas barrier layer, and a laminate including an innermost heat-resistant heat-adhesive resin layer, and the bottom laminate is at least an outer heat-resistant and water-resistant resin layer, and an intermediate layer. Since it is formed of a laminate including a gas barrier layer and an innermost heat-resistant heat-adhesive resin layer, the container has heat resistance to withstand retort sterilization, water resistance, and gas barrier properties. In addition, the preservability of contents such as food can be improved.
(3) Since the cardboard is laminated on the intermediate layer, moderate rigidity is imparted to the laminate for the wall surface before and after forming the body of the container, the shape retention of the container is improved, and the contents are crushed. Even if it includes easy-to-use items, it can be protected. In addition, in the lower part of the container, the rigidity of the legs formed by the heat sealing portion on the outer periphery of the bottom surface is also increased, so that the self-sustainability of the container is further improved.
(4) Further, by applying a design such as a pattern by printing on the outer surface of the cardboard of the intermediate layer or the inner surface of the heat-resistant / water-resistant resin layer on the outside, the printing effect is enhanced by the whiteness of the cardboard, and the container design is improved. Properties can be further improved.
[0016]
The invention described in claim 2 is that the intermediate layer has a rice basis weight of 70 to 280 g / m. Two 2. The self-supporting bag-shaped container according to claim 1, wherein the thickness of the cardboard is 400 seconds or more.
The above-mentioned Steckigt sizing degree is a value measured according to the Steckigt sizing degree test method for JIS P8122 paper.
[0017]
The basis weight of the intermediate layer is 70 to 280 g / m. Two It is preferable that the Steckigt sizing degree of the cardboard be 400 seconds or more in that the retort treatment after filling the contents can be performed more safely. The upper limit is not particularly limited, but it is preferably up to about 1200 seconds from the viewpoint of economy and technology. Appropriate.
If the Stiffig sizing degree of the cardboard is less than 400 seconds, the water resistance is insufficient, and water tends to be absorbed from the end face of the cardboard during the retort treatment, which is not preferable because the rigidity of the container is reduced.
[0018]
Therefore, by adopting the above-described configuration, the water resistance of the cardboard laminated on the intermediate layer of the laminate for the wall surface of the container is improved, in addition to the operation and effect of the invention described in claim 1, and the content is improved. When retorting a self-supporting bag-like container filled with an object, permeation of moisture from the end face of the cardboard can be further reduced, and retorting can be performed more safely.
[0019]
The invention described in claim 3 is characterized in that the gusset portion at the bottom of the container is heat-sealed with a ship bottom-shaped seal pattern in which the central portion inside is low and the height toward both ends is high. Item 1. A self-supporting bag-shaped container according to item 1 or 2.
[0020]
The bottom-shaped seal pattern for heat-sealing the gusset at the bottom of the self-supporting bag-shaped container is not particularly limited, as long as the shape is such that the inner central portion is low and the height increases toward both end portions. As a preferable shape, a ship bottom-shaped seal pattern in which the inside is formed by a curved line such as an arc, or a ship bottom-shaped seal pattern in which the inside rises straight from the bottom having a predetermined width and both sides are inclined outward. Can be mentioned.
[0021]
By adopting such a configuration, in addition to the functions and effects of the invention described in claim 1 or 2, the self-supporting bag-like container filled with the contents has a bottom in accordance with the ship bottom-shaped seal pattern. For example, in the case of a ship bottom-shaped seal pattern in which the inside is formed by a curved line, the ship bottom shape is an elliptical shape, and the inside is a straight bottom shape in which both sides rise straight from the bottom of a predetermined width to both sides with an inclination to the outside. In the case of the seal pattern, it spreads in a hexagonal shape, and in each case, the center part is greatly widened back and forth, and the legs of the heat seal part are securely formed on the outer periphery of the bottom surface, further improving the self-sustainability of the container. be able to.
[0022]
According to a fourth aspect of the present invention, there is provided the self-supporting bag-shaped container according to any one of the first to third aspects, wherein an opening means is provided on an upper portion of the container.
[0023]
The opening means may be an opening instruction line or an opening instruction mark such as a cut line displayed by printing, or an easy-opening means such as the following which facilitates the actual opening operation by tearing. Is also good. Further, these may be provided by appropriately combining a plurality of them.
[0024]
As the above easy-opening means, for example, in addition to a method of providing a notch often used in ordinary pouches, a method of providing a half-cut line by laser light irradiation, or a method of easily tearing in a laminate for a wall surface of a container There is a method of laminating a uniaxially stretched film (in this case, the uniaxially stretched film is laminated so that the stretching direction coincides with the opening direction of the container), and these may be used alone. A plurality of means such as a half-cut line or lamination of a uniaxially stretched film can be used in appropriate combination.
As the notch, a notch such as a single character or a V-shape is usually used, but the shape is not particularly limited, and any shape having an acute angle portion in a cutting direction can be used.
When the half-cut line is provided, the half-cut line is not limited to a linear half-cut line, but may be provided by an intermittent half-cut line such as a perforated line. Furthermore, such a half-cut line may be one, but assuming that the tearing direction is shifted, a plurality of half-cut lines such as one or two on each side of the central half-cut line. It may be provided in parallel or so as to converge to the central half-cut line.
[0025]
By adopting such a configuration, in addition to the operation and effect of the invention according to any one of claims 1 to 3, when the contents filled in the container are taken out, the container is opened at the opening position at the top of the container. Since the opening means for facilitating the opening is provided, the entire upper portion of the container can be cut off and opened more easily without making a mistake in the opening position. Further, even if the contents include a solid material together with a liquid material, it can be easily taken out.
[0026]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic cross-sectional view showing an example of the configuration of a front and rear wall laminate used in a retort-treatable self-supporting bag-shaped container of the present invention, and FIG. It is a schematic cross section which shows the structure of an example of the laminated body for bottom surfaces used for a bag-shaped container.
FIG. 3 is a diagram showing the configuration of a first embodiment of a self-supporting bag-like container capable of being retorted according to the present invention, wherein (a) is a schematic front view thereof, and (b) is shown in (a). It is a schematic cross section of the AA line of a self-supporting bag-like container.
FIGS. 4 and 5 are schematic front views showing the configurations of the second and third embodiments of the self-supporting bag-like container capable of being retorted according to the present invention.
However, the present invention is not limited to these drawings unless it exceeds the gist.
[0027]
FIG. 1 is a schematic cross-sectional view showing the configuration of an example of a front and rear wall laminate used for a self-supporting bag-shaped container capable of being retorted according to the present invention. The wall laminate 50a shown in FIG. (From the upper side in the figure), the heat-resistant and water-resistant resin layer 1a and the intermediate layer have a basis weight of 70 to 280 g / m. Two The cardboard 2, the gas barrier layer 3a, and the innermost heat-resistant and heat-adhesive resin layer 4a are laminated in this order via adhesive layers 5a, 5b, and 5c.
FIG. 2 is a schematic cross-sectional view showing a configuration of an example of a bottom laminate used in the self-supporting bag-shaped container capable of being retorted according to the present invention. The bottom laminate 60a shown in FIG. From the upper side in the figure, a heat-resistant and water-resistant resin layer 1b, an intermediate gas barrier layer 3b, and an innermost heat-resistant heat-adhesive resin layer 4b are laminated in this order via adhesive layers 5d and 5e. It is composed.
[0028]
In the laminate 50a for a wall surface or the laminate 60a for a bottom surface shown in FIGS. 1 and 2, the outer heat-resistant and water-resistant resin layers 1a and 1b and the intermediate layer have a basis weight of 70 to 280 g / m. Two The cardboard 2, the gas barrier layers 3a and 3b, and the innermost heat-resistant and heat-adhesive resin layers 4a and 4b have already been described above, and therefore will not be described here to avoid duplication.
When the respective layers are stacked in the form of a film, they can be laminated by a dry lamination method or an extrusion lamination method (sandwich lamination method).
In the case of laminating by a dry lamination method, a known adhesive for dry lamination such as a two-component curing type polyurethane adhesive can be used for the adhesive layers 5a to 5e between the above layers.
In the case of laminating by the extrusion lamination method, the adhesive layers 5a to 5e between the above-mentioned layers are, for example, made of a polypropylene-based thermo-adhesive resin, for example, a polypropylene-based admer (manufactured by Mitsui Chemicals, Inc.). In addition, depending on the conditions of the retort treatment, an ethylene-based copolymer such as an ethylene-methacrylic acid copolymer may be melt-extruded between the layers on both sides in the form of a film, and then pressed and cooled.
[0029]
In particular, the innermost heat-resistant and heat-adhesive resin layers 4a and 4b may be formed by laminating a non-stretched film formed in advance by the above-mentioned method. It can also be laminated.
When a metal foil such as an aluminum foil is used as the gas barrier layers 3a and 3b of the intermediate layer, a protective layer such as a biaxially stretched polyethylene terephthalate film is further provided on the inner surface to prevent cracks due to bending or the like. Can be laminated.
Further, when the respective layers are laminated by a dry lamination method or an extrusion lamination method, the laminating surface thereof may be formed by a known method such as a corona discharge treatment, an ozone treatment, an anchor coat, and a primer coat, if necessary, in order to improve the adhesiveness. For easy adhesion.
In particular, since the laminated surface of the cardboard of the intermediate layer easily absorbs adhesives and the like, if necessary, also serves as a seal, for example, a water-dispersible emulsion such as a polypropylene resin or an aqueous anchor coat by dispersion. Can be applied.
An aqueous anchor coating agent using a polypropylene-based resin is also excellent in heat resistance, and in the present invention, can be suitably used as an agent for improving the size of the cardboard.
[0030]
In the present invention, the cardboard 2 is mainly laminated on the intermediate layer in order to increase the rigidity and improve the shape retention of the container in the laminate 50a for the wall surface. Is required to have flexibility, so that there is no particular need to laminate cardboard. However, in the vicinity of the bottom center of the self-supporting bag-shaped container, it can be used as an auxiliary means to improve the shape retention of the container by increasing the rigidity.Therefore, laminating cardboard in a pattern in this part is acceptable. Absent.
In the case where a design such as a picture is applied to the wall laminate 50a by printing, it is not shown in the figure, but the inner surface of the outer heat-resistant and water-resistant resin layer 1a or the inner rice basis weight of 70 to 280 g is not shown. / M Two It is preferable to print on the outer surface of the thick paper 2, whereby the whiteness and opacity of the thick paper can be used, so that the printing effect can be enhanced, the design of the container can be further improved, and the printing layer has an outer heat resistance. Since it is protected by the water-resistant resin layer 1a, it is safe against external friction and the like.
[0031]
FIG. 3 is a diagram showing the configuration of a first embodiment of a self-supporting bag-like container capable of being retorted according to the present invention, wherein (a) is a schematic front view thereof, and (b) is shown in (a). It is a schematic cross section of the AA line of a self-supporting bag-like container.
The bottom portion of the self-supporting bag-shaped container 100 that can be retorted shown in FIGS. 3A and 3B is located between the lower portions of the front and rear wall laminates 50, 50. Is formed in a form having a gusset portion 9 which is folded inward and inserted to the bottom-layer laminate folded portion 11, and near the lower ends on both sides of the bottom laminate 60 folded inward, in this case, a semicircular The bottom laminate cutouts 10a and 10b are provided, and the gusset 9 has a ship bottom-shaped seal pattern in which the inside rises straight from the bottom with a predetermined width to the outside with a slope on both sides. The body portion is formed by heat sealing with the bottom seal portion 7, and the body portion is formed by heat sealing the edge portions on both sides of the front and rear wall laminates 50, 50 with the side seal portions 6a, 6b.
[0032]
The upper part of the self-supporting bag-like container 100 is heat-sealed with the upper seal part 8 after filling the contents from this part, but the lower part of the upper seal part 8 can be easily opened. As an opening means, a half-cut line 13 and a notch 12 at one end thereof are provided.
Note that the front and rear wall laminates 50 can be the wall laminate 50a having the configuration described with reference to FIG. 1, and the bottom laminate 60 described with reference to FIG. The bottom laminate 60a having the above configuration can be used.
[0033]
The seal pattern of the bottom seal portion 7 for heat-sealing the bottom gusset portion 9 shows a more preferable shape in the figure, so that the ship bottom has a shape in which the inside rises straight from the bottom with a predetermined width to both sides with a slope outward. Although the shape of the seal pattern is shown, a seal pattern that heat seals the outer periphery of the bottom gusset portion 9 with a predetermined width may be used. However, even in this case, in order to further improve the independence of the container, near the lower ends on both sides of the bottom laminate 60 folded inward, similar bottom cutouts 10a and 10b for the bottom are provided. It is preferable that the portion is heat-sealed with the seal pattern having the predetermined width.
[0034]
By adopting such a configuration, the filling of the contents is easily performed from the upper opening of the self-supporting bag-shaped container 100 by using, for example, a conventional filling machine for a standing pouch, and after filling. The upper seal portion 8 can be heat-sealed and sealed by a method such as a degassing seal.
Since the container 100 filled with the contents has a hexagonal bottom portion and a wide three-dimensional structure that spreads back and forth, the container 100 can be packed compactly for its capacity, and the outer periphery of the bottom surface is provided with a heat seal portion. The leg portions are securely formed, and the front and rear wall laminates 50 have a middle weight of 70 to 280 g / m. Two Since the cardboard 2 is laminated and the rigidity is increased, the self-sustainability and shape retention of the container are improved, and even if the content is a food containing a crushable solid, it can be safely protected. Can be.
[0035]
In the self-supporting bag-shaped container 100, the front and rear wall laminates 50 are arranged such that the heat-resistant and water-resistant resin layer 1a, the cardboard 2, the gas barrier layer 3a, and the heat-resistant heat-adhesive resin layer 4a are arranged at least from the outside. Are laminated in this order via adhesive layers 5a, 5b, 5c, and the bottom laminate 60 is formed from at least the outer side of the heat-resistant / water-resistant resin layer 1b, the gas barrier layer 3b, and the heat-resistant heat bonding. Since the conductive resin layer 4b is formed by sequentially laminating through the adhesive layers 5d and 5e, the resin layer 4b has heat resistance and water resistance to withstand retort sterilization as a whole, and also has excellent gas barrier properties. It has excellent long-term storage properties.
[0036]
When the contents filled in the self-supporting bag-shaped container 100 are taken out, a half-cut line 13 and one of the half-cut lines 13 are provided below the upper seal portion 8 as opening means for easily opening the container 100. Since the notch 12 is provided at the end of the container 100, the entire upper portion of the container 100 can be easily opened by tearing along the half-cut line 13 starting from the notch 12 without using tools such as scissors. Can be. Therefore, even when the contents include solids as well as liquids, they can be easily taken out.
Further, when a design such as a printed pattern is applied to the self-supporting bag-shaped container 100, the inner surface of the heat-resistant and water-resistant resin layer 1a outside the front and rear wall laminates 50 or the outer surface of the cardboard 2 may be used. By printing, the whiteness and opacity of the cardboard 2 can be used, so that the printing effect is enhanced and the design of the container 100 can be further improved.
[0037]
FIG. 4 is a schematic front view showing the configuration of a second embodiment of the self-supporting bag-like container capable of being retorted according to the present invention. The self-supporting bag-like container 200 shown in FIG. In the configuration of the self-supporting bag-shaped container 100 shown in FIG. 7, only the seal pattern of the bottom seal portion 7 for heat-sealing the bottom gusset portion 9 is changed to a ship bottom seal pattern in which the inside is formed by an arcuate curved line. All other configurations are formed and configured in the same manner as the self-supporting bag-shaped container 100 shown in FIG.
[0038]
By adopting such a configuration, as compared with the self-supporting bag-shaped container 100 shown in FIG. 3, the shape of the bottom of the container 200 after the contents are filled is changed from a hexagonal shape to an elliptical shape. The self-supporting bag-shaped container 200 has almost no change in terms of self-sustainability and shape retention, and is excellent in the same manner as the self-supporting bag-shaped container 100 shown in FIG. 3, and the other configurations are the same. Thus, the same function and effect as those described for the self-supporting bag-shaped container 100 shown in FIG. 3 can be obtained.
[0039]
Next, FIG. 5 is a schematic front view showing a configuration of a third embodiment of a self-supporting bag-like container capable of being retorted according to the present invention. The self-supporting bag-shaped container 300 shown in FIG. 5 is different from the self-supporting bag-shaped container 100 shown in FIG. 3 in that the front and rear wall surfaces are formed in order to further improve the shape retention of the container 300. On both sides of the central part of the laminates 50, 50, from both ends of the bottom part of a predetermined width of the bottom seal pattern of the bottom seal part 7, that is, from the vicinity of the base part of the part which rises linearly with an outward slope. It is configured by additionally providing two pressing rules 14 and 14 (the back side is not shown) up to a position slightly above the container body upward. All are formed and configured in the same manner as the self-standing bag-shaped container 100 shown in FIG.
[0040]
By adopting such a configuration, the self-supporting bag-shaped container 300 has the same structure as the self-supporting bag-shaped container 100 shown in FIG. Since the two creasing lines 14 and 14 are provided, in addition to the operation and effect described for the self-supporting bag-shaped container 100 shown in FIG. 3, when the container 300 is filled with the contents, Are spread in a hexagonal shape back and forth, and the body part thereon is also bent and spread by the four front and rear rulers 14, so that the body part of the container becomes a stable hexagonal column shape, and the shape retention of the container 300 is further improved. be able to.
[0041]
As described above, the self-supporting bag-like container capable of being retorted according to the present invention has a main body in the form of a bottom portion formed in a gusset form to impart self-supporting property, like a normal standing pouch. Basically, it can be manufactured using a conventional standing pouch bag making machine. If necessary, change the shape of a sealing head such as a hot plate for heat-sealing the gusset at the bottom, and if a half-cut line or notch is provided as an opening means at the top of the container, for example, use a laser light. By adding an irradiation device or a punching device to the bag making machine for the standing pouch, and when providing a creasing rule for the front and rear wall laminates, by additionally adding a hot press device or an embossing device, etc. All can be easily manufactured.
[0042]
【Example】
Next, the self-supporting bag-like container capable of being retorted according to the present invention will be described more specifically with reference to examples.
[0043]
(Example 1)
A self-supporting bag-like container capable of retort processing having the configuration shown in FIG. 3 is to be manufactured, and biaxially stretched polyethylene terephthalate film (hereinafter, referred to as PET film) is used as the front and rear wall laminate 50 from the outside. (Thickness 12μm) / adhesive layer 1 / multicolor gravure printing layer / cup base paper (US basis weight 150g / m Two ) / Adhesive layer 2 / aluminum foil (thickness 6 μm) / adhesive layer 3 / PET film (thickness 12 μm) / adhesive layer 4 / unstretched polypropylene film (hereinafter referred to as CPP film) (thickness 60 μm) PET film (thickness: 12 μm) / adhesive layer 5 / biaxially stretched nylon film (hereinafter referred to as ON film) (thickness: 15 μm) / adhesive layer 6 / Aluminum foil (thickness 9 μm) / adhesive layer 7 / PET film (thickness 12 μm) / adhesive layer 8 / CPP film (thickness 60 μm) A laser beam irradiation device and a punching device for providing the half cut line 13 and the notch 12 are attached to the Was processed to have a width of 130 mm, a length of 190 mm, and a length of the gusset portion 9 of 40 mm, thereby producing a self-supporting bag-shaped container of Example 1.
[0044]
In the configuration of the laminate 50 for the wall surface and the laminate 60 for the bottom surface, only the portion of the adhesive layer 2 among the adhesive layers 1 to 8, that is, the lamination of the cup base paper and the aluminum foil is applied to the adhesive layer 2 by ethylene. Except for using a methacrylic acid copolymer (thickness: 15 μm) and bonding them together by an extrusion lamination method, they were all bonded together by a dry lamination method using a two-component curing type polyurethane adhesive.
The half-cut line 13 at the top of the container is composed of a PET film (thickness: 12 μm) and a cup base paper (US basis weight: 150 g / m2) from the outside. Two ) Was cut so that the thickness was reduced to about の.
[0045]
(Example 2)
In the configuration of the self-supporting bag-shaped container of the first embodiment, an aluminum foil (thickness: 6 μm) as an intermediate layer of the laminate 50 for the wall surface and the laminate 60 for the bottom surface and a PET film (thickness) adhered inside as a protective layer. 12 μm) and a PET film (thickness: 12 μm) in which aluminum was vapor-deposited to a thickness of 400 ° and laminated to produce a laminate 50 for the wall surface and a laminate 60 for the bottom surface, except that all were processed in the same manner as in Example 1. Thus, a self-supporting bag-shaped container of Example 2 was produced.
[0046]
(Comparative Example 1)
In the configuration of the self-supporting bag-shaped container of the first embodiment, a cup base paper having a multicolor gravure printing layer provided on the surface laminated on the intermediate layer of the wall laminate 50 (rice basis weight 150 g / m2) Two ) Is removed and the printing layer is provided on the inner surface of the outer PET film (thickness: 12 μm) with a multicolor gravure printing layer of the same design in the back printing method, and the printing layer surface of the PET film and the aluminum foil (thickness: 6 μm) are provided. Were processed in the same manner as in Example 1 except that they were bonded by a dry lamination method to produce a self-supporting bag-shaped container of Comparative Example 1.
In this case, the half-cut line 13 is provided so that all layers of the outer PET film (thickness: 12 μm) are cut.
[0047]
(Comparative Example 2)
In the configuration of the self-supporting bag-shaped container of Example 1, the CPP film (thickness: 60 μm) used for the innermost layers of the wall laminate 50 and the bottom laminate 60 is a low-density polyethylene film (hereinafter, LDPE). A self-supporting bag-shaped container of Comparative Example 2 was prepared by processing in the same manner as in Example 1 except that the film was bonded to the film (thickness: 60 μm).
[0048]
[Test and results]
For the self-supporting bag-shaped containers of Examples 1 and 2 and Comparative Examples 1 and 2 produced as described above, in order to evaluate the suitability of the retort treatment, a test of the retort sterilization treatment was performed as follows, and Were also evaluated for shape retention, self-sustainability, openability, and printing effect.
[0049]
Test of suitability for retort sterilization
The self-supporting bag-shaped containers of Examples 1 and 2 and Comparative Examples 1 and 2 were used as samples, each of which was filled with curry for retort (filled), and the upper seal portion 8 was degassed and sealed. After sealing, using a steam type retort pot, temperature 120 ° C, pressure 1.5 × 10 Five Pressurized and heat sterilized under the conditions of Pa, time 30 minutes, and after cooling mainly by air cooling, take out from the retort pot and check for leakage of the seal of the container, deterioration of the appearance, presence of the cardboard swelling phenomenon, etc. The retort treatment suitability was evaluated.
[0050]
As a result of the above-mentioned retort sterilization treatment, the self-supporting bag-shaped containers of Examples 1 and 2 did not have any seal leakage or deterioration in appearance, had almost no cardboard swelling phenomenon, and had good heat resistance and water resistance. It had retort treatment suitability such as properties. In addition, the shape retention, self-sustainability, and printing effect of the container were also excellent because the cardboard improved rigidity and imparted whiteness and opacity. Further, regarding the opening property of the container, in this case, since the notch 12 and the half cut line 13 are provided as opening means, the upper seal portion 8 of the container can be easily cut off by hand to open the entire upper portion. It was possible and the opening property was also good.
[0051]
On the other hand, the self-supporting bag-shaped container of Comparative Example 1 does not have cardboard laminated on the intermediate layer of the laminate 50 for the wall surface, and therefore has low rigidity and is inferior in shape retention. It was easy to be rubbed by hand and lacked protection of the contents, and was somewhat inferior in terms of independence and printing effect.
In addition, the self-supporting bag-shaped container of Comparative Example 2 has high rigidity because cardboard is laminated on the intermediate layer of the wall laminate 50, and is excellent in shape retention and self-sustainability. Since the innermost sealant layer of the body 50 and the bottom laminate 60 is made of LDPE, it is excellent as a container for general use, but lacks heat resistance as a container for retort sterilization, and is sealed by the retort sterilization. Leakage occurred and was not preferred.
[0052]
【The invention's effect】
As is apparent from the above description, according to the present invention, it is possible to manufacture with an inexpensive material, and does not require a special device for manufacturing a container or a filling and sealing device, and can easily use a conventional device. In addition to those that can be manufactured, the container has excellent self-sustainability and moderate rigidity, that is, having shape retention, heat resistance and water resistance to withstand retort sterilization treatment, and those whose contents are easily crushed Even if it is safe, it can be easily opened on the whole surface of the container, and the design effect by printing the container can be improved. The effect of being able to provide the container with high productivity is exhibited.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view showing the configuration of an example of a front and rear wall laminate used for a self-supporting bag-like container capable of being retorted according to the present invention.
FIG. 2 is a schematic cross-sectional view showing a configuration of an example of a bottom-side laminate used for a self-supporting bag-like container capable of being retorted according to the present invention.
FIG. 3 is a view showing the configuration of a first embodiment of a self-supporting bag-like container capable of being retorted according to the present invention, wherein (a) is a schematic front view thereof, and (b) is shown in (a). It is a schematic cross section of the AA line of a self-supporting bag-like container.
FIG. 4 is a schematic front view showing a configuration of a second embodiment of a self-supporting bag-like container capable of being retorted according to the present invention.
FIG. 5 is a schematic front view showing a configuration of a third embodiment of a self-supporting bag-like container capable of being retorted according to the present invention.
[Explanation of symbols]
1a, 1b Heat and water resistant resin layer
2 cardboard
3a, 3b Gas barrier layer
4a, 4b heat-resistant heat-adhesive resin layer
5a, 5b, 5c, 5d, 5e adhesive layer
6a, 6b Side seal
7 Bottom seal
8 Upper seal part
9 Gusset part
10a, 10b Notch for laminated body for bottom surface
11 Laminate folded part for bottom surface
12 notches
13 Half cut line
14 Pressed crease
50, 50a laminate for wall surface
60, 60a Laminate for bottom surface
100, 200, 300 Free-standing bag-shaped container

Claims (4)

積層体を袋状にヒートシールして形成される自立性袋状の容器であって、該容器の胴部が、前後の壁面用積層体の両側端縁部を側部シール部でヒートシールして形成され、底部が、前後の壁面用積層体の下部の間に底面用積層体を内側に折り返して挿入し、ヒートシールしてなるガセット部を有する形式で形成され、且つ、前後の壁面用積層体が、少なくとも外側の耐熱性・耐水性樹脂層と、中間層の米坪量70〜280g/m2 の厚紙、およびガスバリヤー層と、最内層の耐熱性熱接着性樹脂層とを含む積層体で形成され、また、底面用積層体が、少なくとも外側の耐熱性・耐水性樹脂層と、中間層のガスバリヤー層と、最内層の耐熱性熱接着性樹脂層とを含む積層体で形成されていることを特徴とするレトルト処理可能な自立性袋状の容器。A self-supporting bag-shaped container formed by heat-sealing the laminate in a bag shape, wherein the body of the container heat-seals both side edges of the front and rear wall laminates with side seal portions. The bottom portion is formed in a form having a gusset portion formed by folding and inserting the bottom laminate to the inside between the lower portions of the front and rear wall laminates, and heat-sealing the bottom laminate. The laminate includes at least an outer heat-resistant and water-resistant resin layer, an intermediate layer of cardboard having a basis weight of 70 to 280 g / m 2 , a gas barrier layer, and an innermost heat-resistant heat-adhesive resin layer. Formed by a laminate, the bottom laminate is a laminate including at least an outer heat-resistant and water-resistant resin layer, an intermediate gas barrier layer, and an innermost heat-resistant heat-adhesive resin layer. Retort-processable free-standing bag-shaped container characterized by being formed . 前記中間層の米坪量70〜280g/m2 の厚紙のステキヒト・サイズ度が、400秒以上であることを特徴とする請求項1記載の自立性袋状の容器。 2. The self-supporting bag-like container according to claim 1, wherein the Sticht sizing degree of the cardboard having a rice basis weight of 70 to 280 g / m2 of the intermediate layer is 400 seconds or more. 前記容器の底部のガセット部が、内側の中央部が低く、両側端部に向かって高くなる船底形のシールパターンでヒートシールされていることを特徴とする請求項1または2に記載の自立性袋状の容器。The self-sustainability according to claim 1 or 2, wherein the gusset portion at the bottom of the container is heat-sealed with a ship bottom-shaped seal pattern in which a central portion on the inside is low and the height is increased toward both end portions. Bag-shaped container. 前記容器の上部に開封手段が設けられていることを特徴とする請求項1乃至3のいずれかに記載の自立性袋状の容器。4. The self-supporting bag-shaped container according to claim 1, wherein an opening means is provided on an upper portion of the container.
JP2002366095A 2002-12-18 2002-12-18 Self-supporting bag-like container that can be retorted Expired - Fee Related JP4139681B2 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008174288A (en) * 2007-01-19 2008-07-31 Dainippon Printing Co Ltd Stand pouch
JP2008265855A (en) * 2007-04-25 2008-11-06 Dainippon Printing Co Ltd Paper container for retort processing, and retort product

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200468667Y1 (en) * 2011-09-06 2013-08-27 씨제이제일제당 (주) A container for packing Kimchi

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008174288A (en) * 2007-01-19 2008-07-31 Dainippon Printing Co Ltd Stand pouch
JP2008265855A (en) * 2007-04-25 2008-11-06 Dainippon Printing Co Ltd Paper container for retort processing, and retort product

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