JP4058936B2 - Gusset bag - Google Patents

Description

【００２４】
従来の開封テープでは、そのシーラント層に比較的低温で溶融するホットメルト接着剤を使用しており、そのため、流動状態にある４０℃以上の内容物を充填した場合に剥離や脱落を生ずるおそれがあった。これに対し、上記表１に示す材料はいずれも比較的融点が高く、それぞれの組を構成する一対の材料は融点がほぼ等しいか或いは完全に等しく互いに熱接着可能である。そのため、上記表１に示す組み合わせの中からシーラント層１３の材料とシーラント層２３の材料とを選択した場合、ガセット袋１に流動状態にある４０℃以上の内容物を充填した際に開封テープ２１が包装材料１１から剥離或いは脱落するのを防止することができる。
【００２５】
図１（ａ）に示すガセット袋１の角筒部１ａ及び耳部１ｂは、図１（ｂ）に示す包装材料１１の左右の端部同士を封筒貼りすることにより形成してもよいが、図１（ｂ）に示す包装材料１１の左右の端部同士を合掌貼りすることにより形成することが好ましい。後者の場合、密封性の観点で有利である。
【００２６】
包装材料１１の端部同士を合掌貼りして耳部１ｂを形成する場合、図２（ａ），（ｂ）に示す構造を採用することが好ましく、図３に示す構造を採用することがより好ましい。
【００２７】
図２（ａ）は図１（ａ）に示すガセット袋１で採用することが可能な構造の一例を概略的に示す斜視図であり、図２（ｂ）は図２（ａ）に示す構造の断面図である。また、図３は、図１（ａ）に示すガセット袋１で採用することが可能な構造の他の例を概略的に示す斜視図である。
【００２８】
図２（ａ），（ｂ）に示す構造では、開封テープ２１は、図２（ｂ）に示すように、角筒部１ａの内周に沿って時計回りに巡らされており、その一方の端縁は耳部１ｂと角筒部１ａとの境界と耳部１ｂの端縁との間に位置し、他方の端縁は耳部１ｂと角筒部１ａとの境界よりも手前に位置している。テープ基材２２とシーラント層１３とが直接接触した部分やテープ基材２２同士が重なり合った部分では密着性が低いため、耳部１ｂ内で開封テープ２１のテープ基材２２同士が重なり合った場合やテープ基材２２とシーラント層１３とが直接接触した部分が外部空間に通じている場合には十分な密封性が得られないことがある。これに対し、図２（ａ），（ｂ）に示す構造では、耳部１ｂ内で開封テープ２１のテープ基材２２同士が重なり合うことがなく、また、テープ基材２２とシーラント層１３とが直接接触した部分と外部空間との間にはシーラント層１３同士が直接接触した部分が介在しているため、極めて高い密封性が実現される。
【００２９】
図３に示す構造は、耳部１ｂに一対の切れ目２が設けられている点で図２（ａ），（ｂ）に示す構造とは異なっている。図３に示す構造において、それら切れ目２は耳部１ｂと角筒部１ａとの境界までは達していないため、このような構造を採用することにより、密封性を低下させることなく、さらに優れた易開封性を付与することができる。
【００３０】
本実施形態において、ガセット袋１は、第２の実施形態で説明する通常のガセット袋及び特種ガセット袋のいずれであってもよい。また、ガセット袋１に設ける開封テープ２１の本数に特に制限はなく、１本であっても複数本であってもよい。
【００３１】
包装材料１１は、フィルム基材１２及びシーラント層１３に加えて他の層を有し得る。例えば、包装材料１１は、フィルム基材１２のシーラント層１３が設けられた面の裏面に、第２の実施形態で述べるような紙材料層を有していてもよい。
【００３２】
また、包装材料１１には、フィルム基材１２とシーラント層１３との間に接着剤層を設けることができる。同様に、開封テープ２１にも、テープ基材２２とシーラント層２３との間に接着剤層を設けることができる。これら接着剤層には、例えば、ドライラミネート接着剤やノンソルベントラミネート接着剤などを用いることができる。
【００３３】
フィルム基材１２の材料に特に制限はなく、また、フィルム基材１２の構造は単層構造及び積層構造のいずれであってもよい。例えば、フィルム基材１２として、二軸延伸ポリエステルフィルムと延伸ナイロンフィルムとをドライラミネート接着剤層を介して積層したものや、第２の実施形態で説明するように、延伸プラスチックフィルム上に蒸着層を積層したものや、延伸プラスチックフィルム上に蒸着層及び被覆層を順次積層したものなどを使用することができる。
【００３４】
また、テープ基材２２としては、例えば、二軸延伸ポリエステルフィルムやナイロンフィルムナイロンテープなどを使用することができる。テープ基材２２の幅は易開封性などに基づいて決定され、通常は２〜６ｍｍ程度である。また、テープ基材２２の厚さはその強度などに基づいて決定され、例えば、２５μｍ程度である。
【００３５】
シーラント層１３は、後述するようにフィルム基材１２上に接着剤層を介してラミネートすることによって設けられてもよく、或いは、フィルム基材１２上に溶融した樹脂を直接押出コーティングすることにより設けてもよい。同様に、シーラント層２３は、テープ基材２２上に接着剤層を介してラミネートすることによって設けられてもよく、或いは、テープ基材２２上に溶融した樹脂を直接押出コーティングすることにより設けてもよい。
【００３６】
シーラント層１３，２３に用いられるエチレン共重合体としては、例えば、アイオノマー、エチレン−酢酸ビニル共重合体、エチレン−アクリル酸メチル共重合体、及びエチレン−メタクリル酸共重合体などを挙げることができる。
【００３７】
上述したガセット袋１は、例えば、以下の方法で製造することができる。すなわち、まず、連続した包装材料１１上にその流れ方向に沿って開封テープ２１を配置するとともに、それらを互いに熱融着させる。次いで、包装材料１１をその開封テープ２１を熱融着させた面が内側になるように筒状に巻き、その端部同士を熱融着（合掌貼り）させる。その後、筒状とした包装材料１１を折り曲げることにより角筒状とするとともに、その一方の開口側端部をガセットシールする。さらに、これを所定の寸法に裁断することによりガセット袋１を得る。
【００３８】
また、このガセット袋１を用いた羊羹の包装は、例えば、以下の方法で行うことができる。すなわち、まず、８０℃程度に加熱した流動状態の羊羹を上記のガセット袋１に充填する。次いで、ガセット袋１の開口側端部を折り畳むとともに封止する。さらに、ガセット袋１に充填した羊羹を冷却・非流動化することにより羊羹をガセット袋１で包装してなる包装物品が得られる。
【００３９】
次に、本発明の第２の実施形態について説明する。
図４（ａ），（ｂ）は、それぞれ、本発明の第２の実施形態に係るガセット袋の例を概略的に示す斜視図である。図４（ａ）に示すガセット袋１は両側面に折目が設けられた通常のガセット袋であり、図４（ｂ）に示すガセット袋１は両側面に折目が設けられていない特種ガセット袋である。
【００４０】
図５は、図４（ａ），（ｂ）に示すガセット袋１を構成する非金属製包装材料１１を概略的に示す断面図である。図５に示す非金属製包装材料１１は、紙材料層１４とフィルム基材１２とシーラント層１３とをこの順に積層した構造を有している。図４（ａ），（ｂ）に示すガセット袋１は、この包装材料１１をシーラント層１３が紙材料層１４に対して内側となるように袋状に形成してなる。
【００４１】
図４（ａ），（ｂ）に示すガセット袋１は、上記の通り、紙材料層１４を含んだ非金属製包装材料１１を使用しているため、隠蔽性に優れている。すなわち、これらガセット袋１によると、内容物の色が包装物品の外観に影響するのを防止することや、内容物が光劣化するのを防止することができる。
【００４２】
また、図４（ａ），（ｂ）に示すガセット袋１で使用する包装材料１１において、紙材料層１４の坪量は１０〜１００ｇ／ｍ²の範囲内にある。紙材料層１４の坪量が低すぎる場合、包装材料１１のデッドホールド性が不十分となることがある。他方、紙材料層１４の坪量が高すぎる場合、包装材料１１に折目をつけ難くなることがある。紙材料層１４の坪量を上記範囲内とすることにより、包装材料１１に容易に折目をつけることができ、しかも、十分なデッドホールド性が得られる。
【００４３】
このような特性を有している包装材料１１を使用した場合、デッドホールド性を殆ど有していない樹脂層のみからなる包装材料を使用した場合とは異なり、以下の方法で羊羹を包装することができる。すなわち、まず、ガセット袋１の開口側端部に、羊羹充填後の封止の際に必要な折目を設ける。次いで、加熱して流動状態とした羊羹をガセット袋１に充填する。その後、ガセット袋１の開口側端部を予め設けておいた折目に従って折り畳み、その状態で封止する。さらに、ガセット袋１内の羊羹を冷却・非流動化することにより包装物品を得る。この方法によれば、開口側端部を折り畳む際に、液面近傍の位置でガセット袋１が変形するのを抑制することができるため、液面の上昇を抑制することができる。したがって、液噛シールの発生を防止することができる。
【００４４】
本実施形態では、シーラント層１３の材料としてポリエチレンを使用する。シーラント層１３の材料としてポリエチレンを使用した場合、メタクリル酸−エチレン共重合体を使用した場合とは異なり、内容物へのシーラント臭の移行は殆ど生じない。
【００４５】
さらに、本実施形態において、シーラント層１３の厚さは８０μｍ以下である。シーラント層１３が厚すぎる場合、封止後のガセット袋の形状，特には封止部及びその近傍の形状，が劣化し、包装物品の美観が損なわれる傾向にある。これに対し、シーラント層１３の厚さが上記の上限値以下であれば、美観に優れた包装物品を容易に製造することができる。
【００４６】
本実施形態において、ガセット袋１の背面における包装材料１１の貼り合わせは、合掌貼りによって為されてもいてもよく、或いは、封筒貼りによって為されていてもよい。
【００４７】
本実施形態において、紙材料層１４の坪量は３０〜７０ｇ／ｍ²の範囲内にあることが好ましい。紙材料層１４の坪量を上記範囲内とすることにより、包装材料１１により容易に折目をつけることができるのに加え、より高いデッドホールド性が得られる。
【００４８】
紙材料層１４としては、例えば、純白ロール紙、クラフト紙、薄葉紙、及び塗工紙などを用いることができる。また、紙材料層１４として不織布なども用いることもできる。さらに、紙材料層１４として、それらの積層体を使用することも可能である。
【００４９】
フィルム基材１２は、例えば、延伸プラスチックフィルム上に蒸着層を積層した構造、或いは、延伸プラスチックフィルム上に蒸着層及び被覆層を順次積層した構造を有する。このような構成のフィルム基材１２は、水蒸気や酸素などの侵入を防ぐガスバリア性に優れている。
【００５０】
延伸プラスチックフィルムの材料としては、例えば、ポリエチレンやポリプロピレンなどのポリオレフィン、ポリエチレンテレフタレートやポリブチレンテレフタレートやポリエチレンナフタレートなどのポリエステル、ナイロン−６やナイロン−６６などのポリアミド、ポリ塩化ビニル、ポリイミド、及びこれらの共重合体などを挙げることができる。
【００５１】
蒸着層の材料としては、例えば、珪素、アルミニウム、チタン、ジルコニウム、錫のような金属の酸化物、窒化物、弗化物、及びそれらの混合物などを挙げることができる。この蒸着層は、真空蒸着法、スパッタリング法、プラズマ気相成長法（ＣＶＤ法）などの真空プロセスにより形成することができる。また、この蒸着層は、通常、１００〜８００Å程度の厚さに形成する。
【００５２】
被覆層は、（ａ）水溶性高分子と、（ｂ）１種以上の金属アルコキシド及び／またはその加水分解生成物と塩化錫との少なくとも一方とを含む水系溶液（水溶液や水／アルコール混合溶液）を主剤としたコーティング剤を用いて形成することができる。例えば、被覆層は、水溶性高分子と塩化錫との水系溶液、或いは、この水系溶液に金属アルコキシド及び／またはその加水分解生成物を混合してなる溶液を、延伸プラスチックフィルム上に形成した蒸着層上に、ディッピング法、ロールコーティング法、スクリーン印刷法、スプレー法などのような方法でコーティングし、さらに、加熱・乾燥することにより得ることができる。被覆層は、通常、乾燥後の厚さが０．０１〜１００μｍ程度となるように形成する。
【００５３】
被覆層を形成するのに用いられる水溶性高分子としては、例えば、ポリビニルアルコール、ポリビニルピロリドン、デンプン、メチルセルロース、カルボキシメチルセルロース、アルギン酸ナトリウムなどを挙げることができる。また、金属アルコキシドは、一般式：Ｍ（ＯＲ）_nで表されるものであり、例えば、テトラエトキシシランやトリイソプロポキシアルミニウムなどを挙げることができる。なお、上記一般式中、ＭはＳｉやＴｉやＡｉやＺｒなどの金属を示し、ＲはＣＨ₃やＣ₂Ｈ₅などのアルキル基を示している。
【００５４】
被覆層は、上記の成分に加え、イソシアネート化合物、シランカップリング剤、分散剤、安定化剤、粘度調整剤、着色剤などの公知の添加剤を、フィルム基材１２のバリア性を損なわない範囲内で含有することができる。
【００５５】
シーラント層１３は、ヒートシール性を有する樹脂フィルムである。シーラント層１３は、後述するようにフィルム基材１２上に接着剤層を介してラミネートすることによって設けられてもよく、或いは、フィルム基材１２上に溶融した樹脂を直接押出コーティングすることにより設けてもよい。
【００５６】
シーラント層１３の厚さは８０μｍ以下であることが好ましい。シーラント層１３の厚さが上記の上限値以下である場合、美観に優れた包装物品をより容易に製造することができる。また、シーラント層１３の厚さは３０μｍ以上であることが好ましい。シーラント層１３の厚さが上記の下限値以上である場合、ピンホールを防止することができ、高い密封性を実現することができる。
【００５７】
上述した包装材料１１には、紙材料層１４とフィルム基材１２との間やフィルム基材１２とシーラント層１３との間に接着剤層１５，１６を設けることができる。これら接着剤層１５，１６には、例えば、ドライラミネート接着剤やノンソルベントラミネート接着剤などを用いることができる。
【００５８】
また、上述した包装材料１１の紙材料層１４上は、印刷層として、インキ層１７や不透明ニス層１８などを設けることができる。このような印刷層を設けることにより、様々な表示が可能となるのに加え、隠蔽性をさらに向上させて、内容物の色が包装物品の外観に影響するのを防止することや、遮光性を高めることができる。
【００５９】
以上説明した第１及び第２の実施形態に係る技術は、互いに組み合わせることができる。すなわち、第１の実施形態で説明したガセット袋１において、第２の実施形態で説明した包装材料１１を使用することができる。この場合、第１の実施形態で説明した効果及び第１の実施形態で説明した効果の双方を得ることができる。
【００６０】
また、第１及び第２の実施形態では、内容物が羊羹である場合について説明したが、内容物は外郎やゼリーなどのように高温下で流動性であり且つ冷却することにより非流動性となるものであれば、上述したのと同様の効果を得ることができる。
【００６１】
【実施例】
以下、本発明の実施例について説明する。
【００６２】
（例１）
図６は、例１で使用した包装材料を示す平面図である。なお、図６において、包装材料１１はそのシーラント層１３側から描かれている。図６に示す包装材料１１には開封テープ２１が熱融着されており、包装材料１１の右側端縁には開封テープ２１の一端を挟むように一対の切れ目２が設けられている。
【００６３】
本例では、図６に示す包装材料１１及び開封テープ２１を用い、以下に説明する方法により、ガセット袋１で羊羹を包装してなる包装物品を製造した。すなわち、まず、この包装材料１１を一点鎖線で示す位置で山折りし且つ破線で示す位置で谷折りするとともに左右の端部同士を合掌貼りして角筒を形成し、さらに、この角筒の一方の開口を封止して、開封テープ２１を有し且つ側面に折目が設けられた通常のガセット袋１を形成した。
【００６４】
次に、８０℃に加熱した流動状態の羊羹を上記のガセット袋１に充填した。次いで、ガセット袋１の開口側端部を折り畳むとともに熱融着させて封止した。さらに、ガセット袋１内の羊羹を冷却することにより非流動化させた。
【００６５】
なお、本例では、フィルム基材１２として、厚さ１２μｍの二軸延伸ポリエステルフィルム（ＰＥＴ）と厚さ１５μｍの延伸ナイロンフィルムとをドライラミネート接着剤で貼り合わせてなる積層体を使用し、シーラント層１３はドライラミネート接着剤を用いてフィルム基材１２の延伸ナイロンフィルムに接着した。また、開封テープ２１の幅は４ｍｍとし、テープ基材２２としては、厚さ２５μｍの二軸延伸ポリエステルフィルム（ＰＥＴ）を使用した。さらに、シーラント層１３，２３には以下の表２に示す材料を使用した。その他の寸法は、図６に記載の通りである。
【００６６】
以上の方法で、シーラント層１３の材料とシーラント層２３の材料との組み合わせが互いに異なるサンプル［１］〜［１５］をそれぞれ２００個づつ作製した。その後、これらサンプル［１］〜［１５］について、開封シール２１の状態を観察し、さらに、開封試験を行った。それら結果を以下の表２に併せて示す。
【００６７】
なお、表２において、「接着」は開封テープ２１が包装材料１１から剥離も脱落もしていなかったものの個数を示し、「一部剥離」は開封テープ２１が包装材料１１から部分的に剥離したものの個数を示し、「脱落」は開封テープ２１が包装材料１１から完全に脱落したものの個数を示している。また、「開封可」は何等問題を生ずることなく開封できたものの個数を示し、「開封不可」は開封途中でテープ切れや抜けが発生したものの個数を示している。さらに、表２において、「ＬＬＤＰＥ」はリニア低密度ポリエチレンを示し、「ＥＸ−ＬＤＰＥ」は溶融押出低密度ポリエチレンを示し、「ＥＶＡ」はエチレン−酢酸ビニル共重合体を示し、「ＥＭＡＡ」はメタクリル酸−エチレン共重合体を示し、「ＣＰＰ」は無延伸ポリプロピレンを示し、「ホットメルト」はＥＶＡを主体とする融点６０℃のホットメルト接着剤を示している。
【００６８】
【表２】

【００６９】
上記表２に示すように、サンプル［１］〜［４］，［７］，［１１］〜［１３］では、羊羹の熱による包装材料１１からの開封テープ２１の剥離や脱落は全く生じず、また、開封の際に不都合を生ずることも全くなかった。
【００７０】
（例２）
以下の表３に示す層構成のサンプル（１）〜（８）を準備した。なお、表３では、シーラント層を右側に示している。また、表３において、「インキ」は白の全面ベタ刷り印刷を示し、「ＤＲＹ」はドライラミネート接着剤層を示し、「ＮＳ」はノンソルベント接着剤層を示し、「ＧＬ−ＡＥ」は凸版印刷株式会社製のＧＬ−ＡＥフィルム（厚さ１２μｍの二軸延伸ポリエステルフィルムの一主面に酸化アルミニウム蒸着層を設けたもの）を示し、「ＬＬＤＰＥ」はリニア低密度ポリエチレン層を示し、「不織布」は大王製紙株式会社製の湿式不織布であるＷＴ−４（パルプ層とパルプと化学繊維とを含有した層との二層構造を有し、化学繊維を含有した面がヒートシール性を有している）を示し、「ＥＸＰＥ」は押出溶融ポリエチレン層を示し、「ＡＬ」はアルミニウム箔を示し、「ＥＭＡＡ」はメタクリル酸−エチレン共重合体層を示し、「Ｋ−ＯＮｙ」はポリ塩化ビニリデンをコート下延伸ナイロンフィルムを示し、「ＰＴ＃３００」はセロハンである。
【００７１】
【表３】

【００７２】
次に、上記サンプル（１）〜（８）を用いて図７に示す寸法の特種ガセット袋１をそれぞれ作製し、それらガセット袋１を通函に入れて冬の屋外（５℃）に２時間放置した。次いで、中粘度充填機を用いて、それらガセット袋１に８０℃に加熱した流動状態の羊羹を充填し、さらに、ガセット袋１の開口を封止した。ガセット袋１内の羊羹を冷却・非流動化した後、得られた包装物品の形状などの評価を行った。なお、包装物品は各サンプル毎に１００個作製し、それら全てについて評価を行った。評価結果を以下の表４に示す。
【００７３】
【表４】

【００７４】
上記表４に示すように、サンプル（１）〜（３）を用いた場合、液噛シールや羊羹へのシーラント臭の移行は全く発生せず、また、製品形状，特には羊羹充填後に封止した開口部の折込形状，の劣化を生ずることもなかった。さらに、サンプル（１）〜（３）を用いた場合、金属探知機を使用することや十分な隠蔽性を得ることができた。
【００７５】
【発明の効果】
以上説明したように、本発明では、包装材料のシーラント層の材料と開封テープのシーラント層の材料とに同系統の熱融着可能な樹脂を使用するため、４０℃以上に加熱することにより流動状態とした内容物を充填する際に開封テープが包装材料から剥離或いは脱落するのを防止することができる。また、本発明では、非金属製包装材料を所定の坪量を有する紙材料層とフィルム基材と所定の厚さのポリエチレンからなるシーラント層とをこの順に積層した層構成としているため、液噛シールの発生を防止すること、ガセット袋を隠蔽性とすること、内容物へのシーラント臭の移行を防止すること、及び、美観に優れた包装物品の製造を容易とすることができる。
【００７６】
すなわち、本発明によると、４０℃以上の高温下において流動性であり且つ冷却することにより非流動性となる内容物を流動状態で充填した際に開封テープの包装材料からの剥離や脱落を生じ難いガセット袋が提供される。また、本発明によると、高温下において流動性であり且つ冷却することにより非流動性となる内容物を流動状態で包装体に充填し、内容物を充填した包装体を封止し、包装体に充填した内容物を冷却することにより包装物品を製造するに当り、上記包装体として使用するガセット袋であって、非金属製包装材料を使用しながらも、液噛シールや内容物へのシーラント臭の移行が発生し難く、美観に優れた包装物品の製造を容易とする隠蔽性のガセット袋が提供される。
【図面の簡単な説明】
【図１】（ａ）は本発明の第１の実施形態に係るガセット袋を概略的に示す斜視図、（ｂ）は（ａ）に示すガセット袋を構成する包装材料を示す平面図、（ｃ）は（ｂ）に示す包装材料のＡ−Ａ線に沿った断面図。
【図２】（ａ）は本発明の第１の実施形態に係るガセット袋で採用することが可能な構造の一例を概略的に示す斜視図、（ｂ）は（ａ）に示す構造の断面図。
【図３】本発明の第１の実施形態に係るガセット袋で採用することが可能な構造の他の例を概略的に示す斜視図。
【図４】（ａ），（ｂ）は、それぞれ、本発明の第２の実施形態に係るガセット袋の例を概略的に示す斜視図。
【図５】本発明の第２の実施形態に係るガセット袋を構成する非金属製包装材料を概略的に示す断面図。
【図６】例１で使用した包装材料を示す平面図。
【図７】例２で作製したガセット袋を概略的に示す斜視図。
【符号の説明】
１…ガセット袋
１ａ…角筒部
１ｂ…耳部
２…切れ目
１１…包装材料
１２…フィルム基材
１３…シーラント層
１４…紙材料層
１５，１６…接着剤層
１７…インキ層
１８…不透明ニス層
２１…開封テープ
２２…テープ基材
２３…シーラント層[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gusset bag, and more particularly, to a gusset bag that is used to wrap contents that are fluid at high temperatures and non-flowable by cooling, such as yokan, guro, and jelly.
[0002]
[Prior art]
Conventionally, for packaging such as sheep, cellophane (PT), melt-extruded polyethylene film (EXPE), aluminum foil (AL), and methacrylic acid / ethylene copolymer sealant (EMMA) are laminated in this order. Is used. However, since such a packaging material contains AL, it cannot be examined using a metal detector after packaging whether or not metal foreign matter is mixed in the sheep. Further, when such a packaging material is moved from a cold place to a warm place such as indoors, dew condensation generated on the surface is absorbed by PT. Moisture absorbed by PT is vaporized by heating at the time of sealing, so that bubbling occurs between PT and AL. Furthermore, EMMA has a strong sealant odor. For these reasons, non-metallic packaging materials as described below are being used for packaging such as sheep sheep instead of the packaging materials described above.
[0003]
Non-metallic packaging materials currently used include, for example, a structure in which a stretched nylon film (K-ONy) coated with polyvinylidene chloride and a linear low density polyethylene film (LLDPE) are laminated, a biaxially stretched polyester film ( PET), stretched nylon film (ONy), and LLDPE are laminated in this order. When such a packaging material is used, the presence or absence of metallic foreign matter in the sheep can be examined using a metal detector after packaging, and the problem of bubbling or sealant odor does not occur. However, such non-metallic packaging materials have the following problems.
[0004]
When conventional packaging materials containing AL are used, the packaging products in which the sheep is wrapped with such a packaging material are usually heated to about 80 ° C. and put into a gusset bag made of the packaging material. It is manufactured by filling, sealing the opening side end, and cooling and non-fluidizing the sheep. According to such a method, a packaged article excellent in aesthetics can be easily obtained.
[0005]
On the other hand, when a non-metallic packaging material is used instead of the packaging material containing AL in the above method, only the region from the opening to the liquid surface is deformed when the opening side end of the gusset bag is sealed. Instead, the region closer to the bottom side is greatly deformed. As a result, the liquid level of the flowable sheep is raised, and as a result, the contents overflow from the gusset bag or a liquid biting seal is generated. Furthermore, when a non-metallic packaging material is used, it is usually difficult to obtain a packaging article having an excellent aesthetic appearance.
[0006]
In general, since non-metallic packaging materials are transparent, when the light resistance of the contents is low, the light deterioration tends to occur. Such photodegradation can be suppressed by providing a printing layer on the packaging material, but concealment by the printing layer is limited, and product display is restricted.
[0007]
The above problem is a problem peculiar when the packaging material does not include the metal layer. However, the packaging has a problem as follows, regardless of whether the packaging material includes the metal layer or not. Existing.
[0008]
An opening tape is known as a technique for imparting easy opening to a gusset bag. However, in the above method of filling a gusset bag with a goat that has been heated to a temperature of 40 ° C. or higher and filled into a gusset bag, the opening tape is opened. There is a risk of the tape peeling or dropping from the packaging material. Therefore, it is conceivable to add easy-openability to the gusset bag by adding a uniaxially stretched film or the like to the packaging material. However, when the contents are three-dimensional like yokan, the orientation of the uniaxially stretched film is improved. In many cases, the easy-openability based on this is not sufficiently exhibited, and the layer structure of the packaging material increases, resulting in an increase in manufacturing cost. Therefore, there is a demand for a technique for preventing the opening tape from being peeled off or dropped from the packaging material when filling the sheep in a fluid state while using the opening tape to impart easy opening to the gusset bag.
[0009]
[Problems to be solved by the invention]
It is an object of the present invention to prevent peeling or dropping of an opening tape from a packaging material when a content that is fluid at a high temperature of 40 ° C. or more and becomes non-fluid by cooling is filled in a fluid state. To provide gusset bags.
[0010]
Another object of the present invention is to fill a packaging body in a fluid state with contents that are fluid at high temperatures and become non-flowable upon cooling, and seal the packaging body filled with the contents. A gusset bag used as the above-mentioned packaging body for producing a packaging article by cooling the contents filled in the body, while using a non-metallic packaging material, It is an object of the present invention to provide a concealing gusset bag that makes it difficult to produce a sealant odor and facilitates the manufacture of a packaged article having an excellent aesthetic appearance.
[0011]
[Means for Solving the Problems]
Of the present invention One side According to the present invention, the contents that are fluid at a first temperature of 40 ° C. or higher and that are non-flowable by setting the second temperature lower than the first temperature are heated in the first temperature. Filling, sealing the package filled with the contents, and cooling the contents filled in the package to the second temperature to use as the package Gusset bag that has a basis weight of 10 to 100 g / m ² A film material interposed between the paper material layer and the first sealant layer, a paper material layer made of polyethylene and having a thickness of 30 μm to 80 μm. A non-metallic packaging material comprising: a tape base material and an opening tape comprising a second sealant layer provided on the tape base material, wherein at least one opening of the packaging material is sealed And a rectangular tube in which the first sealant layer is disposed on the inner side with respect to the film base material, and the opening tape has an inner periphery of the rectangular tube while the second sealant layer is in contact with the first sealant layer. A gusset bag is provided, wherein the material of the first sealant layer and the material of the second sealant layer are a heat-sealable resin of the same system.
[0012]
Na Here, the “non-metallic package” means a package that does not include a metal layer.
[0013]
As described above, the present invention One side Then, the material of the first sealant layer and the material of the second sealant layer are the same type of heat-sealable resin. That is, in the first aspect, for example, when the first sealant layer is made of a polyolefin resin, the second sealant layer is also made of a polyolefin resin. By the way, in the conventional opening tape, a hot melt adhesive that melts at a relatively low temperature is used for the sealant. For this reason, there is a risk of peeling or dropping when the fluid content of 40 ° C. or higher is filled. was there. In contrast, One aspect of the present invention Then, as described above, as the sealant material of the opening tape, a resin of the same system as the sealant material of the packaging material, that is, a material having a relatively high melting point is used. Further, when the sealant of the opening tape and the sealant of the packaging material are made of the same type of heat-sealable resin, their melting points are usually almost equal. for that reason, One aspect of the present invention According to the above, it is possible to prevent the opening tape from being peeled off or dropped from the packaging material when filling the fluidized content by heating to 40 ° C. or higher.
[0014]
And the present invention One side Then, the non-metallic packaging material has a layer structure in which a paper material layer, a film base material, and a sealant layer made of polyethylene are laminated in this order, and the basis weight of the paper material layer is 10 to 100 g / m. ² The thickness of the sealant layer is in the range of 30 μm to 80 μm. In general, a packaging material consisting only of a resin layer has a low or little dead hold property, whereas a packaging material including a paper material layer having a basis weight within the above range has a sufficient dead hold property. . Therefore, for example, when such a gusset bag is used, a predetermined crease is provided in advance on the opening side end of the gusset bag, and then the contents in a fluid state are filled, and then the opening side end of the gusset bag Can be folded according to the folds provided in advance and sealed in that state. According to such a method, it is possible to suppress the deformation of the portion of the gusset bag that is filled with the fluid when the opening-side end portion is folded, and thus it is possible to prevent the occurrence of a liquid seal. Further, by using a packaging material including a paper material layer, concealment can be imparted to the gusset bag. Furthermore, since the sealant layer made of polyethylene is used, the transfer of the sealant odor to the contents hardly occurs, and since the thickness thereof is 80 μm or less, it is easy to manufacture a packaged article excellent in aesthetic appearance.
[0015]
Of the present invention One side In the above, the combination of the material of the first sealant layer and the material of the second sealant layer is a combination of polyethylene and polyethylene or a combination of polyethylene and ethylene copolymer. When these combinations are employed, the above-described effect of preventing peeling and dropping is particularly noticeable.
[0016]
Of the present invention One side In the above, the square tube may be formed in a cylindrical shape by gluing together a pair of opposite ends of the packaging material. In this case, the pair of end portions pasted together constitute an ear projecting from the back of the square tube, and one end of the opening tape is located between the edge of the ear and the square tube and the edge of the ear. The other end of the opening tape may be sandwiched between a pair of end portions that are bonded together so as to be positioned, and may be spaced from one end of the opening tape and positioned on the inner surface of the square tube. Further, in this case, a pair of ears is located on both sides of the one end of the opening tape and a pair of ears from the edge of the ear to the position between the ear-to-square tube boundary and the ear edge. A cut may be provided. In addition, the present invention One side In the case where the combination of the material of the first sealant layer and the material of the second sealant layer is a combination of polyethylene and an ethylene copolymer, the ethylene copolymer is an ionomer, an ethylene-vinyl acetate copolymer, One kind selected from the group consisting of an ethylene-methyl acrylate copolymer and an ethylene-methacrylic acid copolymer may be used.
[0017]
Of the present invention One side The film substrate comprises a stretched film and a vapor deposition layer formed by vapor-depositing at least one compound selected from the group consisting of metal oxides, metal nitrides, and metal fluorides on at least one surface thereof. It may be. further, One aspect of the present invention The packaging material may further comprise a printed pattern on the paper material layer.
[0018]
Of the present invention One side The gusset bag may be a normal gusset bag or a special gusset bag in which no folds are provided on both sides. Further, the content is not particularly limited as long as it is fluid at the first temperature and becomes non-flowable by setting the second temperature lower than the first temperature. And jelly. In the present invention, One side The first temperature is typically 40 to 100 ° C.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, in each figure, the same referential mark is attached | subjected to the same or similar component, and the overlapping description is abbreviate | omitted.
[0020]
FIG. 1A is a perspective view schematically showing a gusset bag according to the first embodiment of the present invention. FIG. 1B is a plan view showing a packaging material constituting the gusset bag shown in FIG. 1A, and FIG. 1C is taken along the line AA of the structure shown in FIG. FIG. In addition, in FIG.1 (b), seeing from the inner surface side of the gusset bag shown to Fig.1 (a), the valley fold is shown with the dashed-dotted line, and the mountain fold is shown with the broken line. Moreover, in FIG.1 (b), the crease | fold of the opening side edge part and a bottom part side edge part is abbreviate | omitted.
[0021]
A gusset bag 1 shown in FIG. 1 (a) is a special gusset bag that has no folds on its side surface, and has a packaging material 11 and an opening tape 21. The packaging material 11 has a structure in which a film substrate 12 and a sealant layer 13 are laminated, and includes a rectangular tube portion 1a in which one opening is sealed and an ear portion 1b which is a bonding portion on the back surface thereof. It is composed. On the other hand, the opening tape 21 has a structure in which a tape base material 22 and a sealant layer 23 are laminated. The opening tape 21 is circulated along the inner periphery of the rectangular tube 1a while bringing the sealant layer 23 into contact with the sealant layer 13 of the packaging material 11, and one end thereof is a pair of the packaging material 11 constituting the ear portion 1b. It is sandwiched between the ends.
[0022]
In the present embodiment, the material of the sealant layer 13 and the material of the sealant layer 23 are selected from a predetermined combination. That is, the material of the sealant layer 13 and the material of the sealant layer 23 are selected from, for example, combinations shown in Table 1 below.
[0023]
[Table 1]

[0024]
In the conventional opening tape, a hot-melt adhesive that melts at a relatively low temperature is used for the sealant layer. Therefore, there is a possibility that peeling or dropping off may occur when the fluid content of 40 ° C. or higher is filled. there were. On the other hand, all the materials shown in Table 1 have a relatively high melting point, and the pair of materials constituting each pair can be thermally bonded to each other with the melting points substantially equal or completely equal. Therefore, when the material of the sealant layer 13 and the material of the sealant layer 23 are selected from the combinations shown in Table 1 above, the opening tape 21 is filled when the gusset bag 1 is filled with the contents in a fluid state of 40 ° C. or higher. Can be prevented from peeling off or falling off from the packaging material 11.
[0025]
Although the square tube part 1a and the ear | edge part 1b of the gusset bag 1 shown to Fig.1 (a) may be formed by carrying out envelope sticking of the left and right ends of the packaging material 11 shown in FIG.1 (b), It is preferable that the left and right ends of the packaging material 11 shown in FIG. The latter case is advantageous in terms of hermeticity.
[0026]
When forming the ear | edge part 1b by gluing together the edge parts of the packaging material 11, it is preferable to employ | adopt the structure shown to FIG. 2 (a), (b), and it is more preferable to employ | adopt the structure shown in FIG. preferable.
[0027]
2A is a perspective view schematically showing an example of a structure that can be adopted in the gusset bag 1 shown in FIG. 1A, and FIG. 2B is a structure shown in FIG. FIG. FIG. 3 is a perspective view schematically showing another example of a structure that can be adopted in the gusset bag 1 shown in FIG.
[0028]
In the structure shown in FIGS. 2 (a) and 2 (b), the opening tape 21 is rotated clockwise along the inner periphery of the rectangular tube portion 1a, as shown in FIG. 2 (b). The edge is located between the boundary between the ear 1b and the square tube 1a and the edge of the ear 1b, and the other edge is located in front of the boundary between the ear 1b and the square tube 1a. ing. Since the adhesiveness is low at the part where the tape base material 22 and the sealant layer 13 are in direct contact and the part where the tape base materials 22 overlap each other, the case where the tape base materials 22 of the opening tape 21 overlap each other in the ear 1b If the portion where the tape base material 22 and the sealant layer 13 are in direct contact with the external space, sufficient sealing performance may not be obtained. On the other hand, in the structure shown in FIGS. 2A and 2B, the tape base materials 22 of the opening tape 21 do not overlap each other in the ear portion 1b, and the tape base material 22 and the sealant layer 13 do not overlap each other. Since a portion where the sealant layers 13 are in direct contact with each other is interposed between the directly contacted portion and the external space, extremely high sealing performance is realized.
[0029]
The structure shown in FIG. 3 is different from the structure shown in FIGS. 2A and 2B in that a pair of cuts 2 are provided in the ear 1b. In the structure shown in FIG. 3, these cuts 2 do not reach the boundary between the ear part 1 b and the rectangular tube part 1 a, and thus by adopting such a structure, the sealing performance is not deteriorated and further improved. Easy openability can be imparted.
[0030]
In this embodiment, the gusset bag 1 may be any of a normal gusset bag and a special gusset bag described in the second embodiment. Moreover, there is no restriction | limiting in particular in the number of the opening tapes 21 provided in the gusset bag 1, One or multiple pieces may be sufficient.
[0031]
The packaging material 11 may have other layers in addition to the film substrate 12 and the sealant layer 13. For example, the packaging material 11 may have a paper material layer as described in the second embodiment on the back surface of the surface of the film base 12 on which the sealant layer 13 is provided.
[0032]
The packaging material 11 can be provided with an adhesive layer between the film substrate 12 and the sealant layer 13. Similarly, an adhesive layer can be provided on the opening tape 21 between the tape base material 22 and the sealant layer 23. For these adhesive layers, for example, a dry laminate adhesive or a non-solvent laminate adhesive can be used.
[0033]
There is no restriction | limiting in particular in the material of the film base material 12, Moreover, the structure of the film base material 12 may be either a single layer structure or a laminated structure. For example, as the film substrate 12, a biaxially stretched polyester film and a stretched nylon film laminated via a dry laminate adhesive layer, or a vapor deposition layer on a stretched plastic film as described in the second embodiment Or a laminate obtained by sequentially laminating a vapor deposition layer and a coating layer on a stretched plastic film.
[0034]
Moreover, as the tape base material 22, a biaxially stretched polyester film, a nylon film nylon tape, etc. can be used, for example. The width | variety of the tape base material 22 is determined based on easy-opening property etc., and is about 2-6 mm normally. Moreover, the thickness of the tape base material 22 is determined based on its strength and the like, for example, about 25 μm.
[0035]
As will be described later, the sealant layer 13 may be provided by laminating on the film base 12 via an adhesive layer, or provided by directly extrusion coating a molten resin on the film base 12. May be. Similarly, the sealant layer 23 may be provided by laminating on the tape base material 22 via an adhesive layer, or provided by directly extrusion-coating a molten resin on the tape base material 22. Also good.
[0036]
Examples of the ethylene copolymer used for the sealant layers 13 and 23 include an ionomer, an ethylene-vinyl acetate copolymer, an ethylene-methyl acrylate copolymer, and an ethylene-methacrylic acid copolymer. .
[0037]
The gusset bag 1 mentioned above can be manufactured by the following method, for example. That is, first, the opening tape 21 is arranged on the continuous packaging material 11 along the flow direction, and they are heat-sealed to each other. Next, the packaging material 11 is wound in a cylindrical shape so that the surface to which the opening tape 21 is heat-sealed is inside, and the ends thereof are heat-sealed (glued together). Thereafter, the cylindrical packaging material 11 is bent into a rectangular tube shape, and one opening side end portion thereof is gusset-sealed. Furthermore, the gusset bag 1 is obtained by cutting this into a predetermined dimension.
[0038]
Moreover, the packaging of the sheep pouch using this gusset bag 1 can be performed by the following method, for example. That is, first, the above-mentioned gusset bag 1 is filled with a fluidized sheep heated to about 80 ° C. Next, the opening side end of the gusset bag 1 is folded and sealed. Furthermore, a wrapping article formed by wrapping the sheep in the gusset bag 1 is obtained by cooling and non-fluidizing the sheep in the gusset bag 1.
[0039]
Next, a second embodiment of the present invention will be described.
FIGS. 4A and 4B are perspective views schematically showing examples of gusset bags according to the second embodiment of the present invention. The gusset bag 1 shown in FIG. 4 (a) is a normal gusset bag with folds on both sides, and the gusset bag 1 shown in FIG. 4 (b) is a special gusset with no folds on both sides. It is a bag.
[0040]
FIG. 5 is a cross-sectional view schematically showing a non-metallic packaging material 11 constituting the gusset bag 1 shown in FIGS. 4 (a) and 4 (b). The non-metallic packaging material 11 shown in FIG. 5 has a structure in which a paper material layer 14, a film substrate 12, and a sealant layer 13 are laminated in this order. The gusset bag 1 shown in FIGS. 4A and 4B is formed by forming the packaging material 11 into a bag shape so that the sealant layer 13 is inside the paper material layer 14.
[0041]
Since the gusset bag 1 shown in FIGS. 4A and 4B uses the non-metallic packaging material 11 including the paper material layer 14 as described above, it has excellent concealment properties. That is, according to these gusset bags 1, the color of the contents can be prevented from affecting the appearance of the packaged article, and the contents can be prevented from being photodegraded.
[0042]
Moreover, in the packaging material 11 used with the gusset bag 1 shown to Fig.4 (a), (b), the basic weight of the paper material layer 14 is 10-100 g / m. ² It is in the range. When the basis weight of the paper material layer 14 is too low, the dead hold property of the packaging material 11 may be insufficient. On the other hand, if the basis weight of the paper material layer 14 is too high, it may be difficult to make a crease in the packaging material 11. By setting the basis weight of the paper material layer 14 within the above range, the packaging material 11 can be easily creased, and sufficient dead hold property can be obtained.
[0043]
When the packaging material 11 having such characteristics is used, unlike in the case of using a packaging material consisting only of a resin layer having almost no dead hold property, the yolk is packaged by the following method. Can do. That is, first, a crease necessary for sealing after filling of the sheep is provided at the opening side end of the gusset bag 1. Next, the gusset bag 1 is filled with the sheep that has been heated and fluidized. Thereafter, the opening side end of the gusset bag 1 is folded according to a fold provided in advance, and sealed in that state. Furthermore, the packaged article is obtained by cooling and non-fluidizing the sheep in the gusset bag 1. According to this method, since the gusset bag 1 can be prevented from being deformed at a position in the vicinity of the liquid level when the opening-side end portion is folded, an increase in the liquid level can be suppressed. Therefore, the occurrence of a liquid seal can be prevented.
[0044]
In the present embodiment, polyethylene is used as the material for the sealant layer 13. When polyethylene is used as the material of the sealant layer 13, unlike the case where a methacrylic acid-ethylene copolymer is used, the transfer of the sealant odor to the contents hardly occurs.
[0045]
Furthermore, in this embodiment, the thickness of the sealant layer 13 is 80 μm or less. When the sealant layer 13 is too thick, the shape of the gusset bag after sealing, particularly the shape of the sealing portion and its vicinity, deteriorates, and the aesthetics of the packaged article tend to be impaired. On the other hand, if the thickness of the sealant layer 13 is not more than the above upper limit value, it is possible to easily manufacture a packaged article excellent in aesthetic appearance.
[0046]
In the present embodiment, the bonding of the packaging material 11 on the back surface of the gusset bag 1 may be performed by gluing, or may be performed by envelope bonding.
[0047]
In this embodiment, the basis weight of the paper material layer 14 is 30 to 70 g / m. ² It is preferable to be within the range. By setting the basis weight of the paper material layer 14 within the above range, the packaging material 11 can easily make a crease, and higher dead hold property can be obtained.
[0048]
As the paper material layer 14, for example, pure white roll paper, craft paper, thin paper, coated paper, and the like can be used. Moreover, a nonwoven fabric etc. can also be used as the paper material layer 14. Furthermore, it is also possible to use those laminates as the paper material layer 14.
[0049]
The film substrate 12 has, for example, a structure in which a vapor deposition layer is laminated on a stretched plastic film, or a structure in which a vapor deposition layer and a coating layer are sequentially laminated on a stretched plastic film. The film substrate 12 having such a configuration is excellent in gas barrier properties for preventing intrusion of water vapor, oxygen and the like.
[0050]
Examples of stretched plastic film materials include polyolefins such as polyethylene and polypropylene, polyesters such as polyethylene terephthalate, polybutylene terephthalate and polyethylene naphthalate, polyamides such as nylon-6 and nylon-66, polyvinyl chloride, polyimide, and the like. And the like.
[0051]
Examples of the material for the vapor deposition layer include oxides, nitrides, fluorides, and mixtures of metals such as silicon, aluminum, titanium, zirconium, and tin. This deposited layer can be formed by a vacuum process such as a vacuum deposition method, a sputtering method, or a plasma vapor deposition method (CVD method). Moreover, this vapor deposition layer is normally formed in the thickness of about 100-800 mm.
[0052]
The coating layer is an aqueous solution (aqueous solution or water / alcohol mixed solution) containing (a) a water-soluble polymer and (b) at least one of one or more metal alkoxides and / or hydrolysis products thereof and tin chloride. ) As a main agent. For example, the coating layer is an evaporation formed by forming an aqueous solution of a water-soluble polymer and tin chloride or a solution obtained by mixing a metal alkoxide and / or a hydrolysis product thereof on the stretched plastic film. It can be obtained by coating the layer by a method such as a dipping method, a roll coating method, a screen printing method, or a spray method, followed by heating and drying. The coating layer is usually formed so that the thickness after drying is about 0.01 to 100 μm.
[0053]
Examples of the water-soluble polymer used to form the coating layer include polyvinyl alcohol, polyvinyl pyrrolidone, starch, methyl cellulose, carboxymethyl cellulose, and sodium alginate. The metal alkoxide is represented by the general formula: M (OR) _n Examples thereof include tetraethoxysilane and triisopropoxyaluminum. In the above general formula, M represents a metal such as Si, Ti, Ai, or Zr, and R represents CH. _Three Or C ₂ H _Five An alkyl group such as
[0054]
In addition to the above components, the coating layer contains known additives such as isocyanate compounds, silane coupling agents, dispersants, stabilizers, viscosity modifiers, colorants, and the like in a range that does not impair the barrier properties of the film substrate 12. Can be contained within.
[0055]
The sealant layer 13 is a resin film having heat sealability. As will be described later, the sealant layer 13 may be provided by laminating on the film base 12 via an adhesive layer, or provided by directly extrusion coating a molten resin on the film base 12. May be.
[0056]
The thickness of the sealant layer 13 is preferably 80 μm or less. When the thickness of the sealant layer 13 is equal to or less than the above upper limit value, it is possible to more easily manufacture a packaged article having excellent aesthetics. The thickness of the sealant layer 13 is preferably 30 μm or more. When the thickness of the sealant layer 13 is not less than the above lower limit value, pinholes can be prevented and high sealing performance can be realized.
[0057]
The packaging material 11 described above can be provided with adhesive layers 15 and 16 between the paper material layer 14 and the film substrate 12 or between the film substrate 12 and the sealant layer 13. For these adhesive layers 15 and 16, for example, a dry laminate adhesive or a non-solvent laminate adhesive can be used.
[0058]
Further, on the paper material layer 14 of the packaging material 11 described above, an ink layer 17 or an opaque varnish layer 18 can be provided as a printing layer. By providing such a printed layer, in addition to enabling various displays, the concealability is further improved to prevent the color of the contents from affecting the appearance of the packaging product, Can be increased.
[0059]
The technologies according to the first and second embodiments described above can be combined with each other. That is, in the gusset bag 1 described in the first embodiment, the packaging material 11 described in the second embodiment can be used. In this case, both the effects described in the first embodiment and the effects described in the first embodiment can be obtained.
[0060]
Further, in the first and second embodiments, the case where the contents are yokan is described. However, the contents are fluid at high temperatures such as taro and jelly, and non-flowable by cooling. If it becomes, the effect similar to the above-mentioned can be acquired.
[0061]
【Example】
Examples of the present invention will be described below.
[0062]
(Example 1)
6 is a plan view showing the packaging material used in Example 1. FIG. In FIG. 6, the packaging material 11 is drawn from the sealant layer 13 side. An opening tape 21 is heat-sealed to the packaging material 11 shown in FIG. 6, and a pair of cuts 2 are provided on the right edge of the packaging material 11 so as to sandwich one end of the opening tape 21.
[0063]
In this example, the packaging material formed by wrapping sheep with the gusset bag 1 was manufactured by the method described below using the packaging material 11 and the opening tape 21 shown in FIG. That is, first, the packaging material 11 is folded at a position indicated by a one-dot chain line and folded at a position indicated by a broken line, and the left and right ends are bonded to each other to form a square tube. One opening was sealed, and a normal gusset bag 1 having an opening tape 21 and having a fold on the side surface was formed.
[0064]
Next, the above-described gusset bag 1 was filled with the sheep in a fluid state heated to 80 ° C. Next, the opening side end portion of the gusset bag 1 was folded and heat-sealed to be sealed. Further, the sheep in the gusset bag 1 was cooled to make it non-fluid.
[0065]
In this example, as the film substrate 12, a laminate formed by laminating a 12 μm thick biaxially stretched polyester film (PET) and a 15 μm thick stretched nylon film with a dry laminate adhesive is used. Layer 13 was adhered to the stretched nylon film of film substrate 12 using a dry laminate adhesive. Moreover, the width of the opening tape 21 was 4 mm, and the tape base material 22 was a biaxially stretched polyester film (PET) having a thickness of 25 μm. Furthermore, the materials shown in Table 2 below were used for the sealant layers 13 and 23. Other dimensions are as described in FIG.
[0066]
By the above method, 200 samples [1] to [15], each having a different combination of the material of the sealant layer 13 and the material of the sealant layer 23, were produced. Then, about these samples [1]-[15], the state of the opening seal | sticker 21 was observed, and also the opening test was done. The results are also shown in Table 2 below.
[0067]
In Table 2, “Adhesion” indicates the number of the opening tape 21 that was not peeled off or dropped off from the packaging material 11, and “Partial peeling” indicates that the opening tape 21 was partially peeled from the packaging material 11. The number indicates the number, and “drop off” indicates the number of the opening tape 21 completely dropped from the packaging material 11. “Openable” indicates the number of items that can be opened without causing any problems, and “Unopenable” indicates the number of items that are broken or missed during opening. Furthermore, in Table 2, “LLDPE” indicates linear low density polyethylene, “EX-LDPE” indicates melt-extruded low density polyethylene, “EVA” indicates an ethylene-vinyl acetate copolymer, and “EMAA” indicates methacrylic. An acid-ethylene copolymer is indicated, “CPP” indicates an unstretched polypropylene, and “hot melt” indicates a hot melt adhesive having a melting point of 60 ° C. mainly composed of EVA.
[0068]
[Table 2]

[0069]
As shown in Table 2 above, in the samples [1] to [4], [7], and [11] to [13], the opening tape 21 was not peeled off or dropped off from the packaging material 11 due to the heat of the sheep. Also, there was no inconvenience at the time of opening.
[0070]
(Example 2)
Samples (1) to (8) having a layer configuration shown in Table 3 below were prepared. In Table 3, the sealant layer is shown on the right side. In Table 3, “Ink” indicates a white solid printing, “DRY” indicates a dry laminate adhesive layer, “NS” indicates a non-solvent adhesive layer, and “GL-AE” indicates letterpress. GL-AE film manufactured by Printing Co., Ltd. (one main surface of 12 μm thick biaxially stretched polyester film provided with an aluminum oxide vapor deposition layer), “LLDPE” indicates a linear low density polyethylene layer, “nonwoven fabric” ”Is a wet nonwoven fabric manufactured by Daio Paper Co., Ltd. WT-4 (having a two-layer structure of a pulp layer and a layer containing pulp and chemical fiber, and the surface containing chemical fiber has heat sealability "EXPE" indicates an extruded molten polyethylene layer, "AL" indicates an aluminum foil, "EMAA" indicates a methacrylic acid-ethylene copolymer layer, and "K-ONy" Polyvinylidene chloride showed the coating under stretched nylon film, "PT # 300" is cellophane.
[0071]
[Table 3]

[0072]
Next, special gusset bags 1 having the dimensions shown in FIG. 7 are prepared using the samples (1) to (8), respectively, and the gusset bags 1 are placed in a box for 2 hours outdoors in winter (5 ° C.). I left it alone. Next, using a medium-viscosity filling machine, these gusset bags 1 were filled with a flow of sheep heated to 80 ° C., and the opening of the gusset bag 1 was further sealed. After the sheep pouch in the gusset bag 1 was cooled and non-fluidized, the shape of the obtained packaging article was evaluated. In addition, 100 packaging articles were produced for each sample, and all of them were evaluated. The evaluation results are shown in Table 4 below.
[0073]
[Table 4]

[0074]
As shown in Table 4 above, when samples (1) to (3) are used, there is no transfer of sealant odor to the liquid chewing seal or to the sheep, and the product shape, particularly after filling the sheep, is sealed. There was no deterioration of the folded shape of the opening. Furthermore, when samples (1) to (3) were used, it was possible to use a metal detector and to obtain sufficient concealment.
[0075]
【The invention's effect】
As described above, in the present invention, since the same type of heat-sealable resin is used for the sealant layer material of the packaging material and the sealant layer material of the opening tape, the flow is achieved by heating to 40 ° C. or higher. It is possible to prevent the opening tape from peeling or dropping from the packaging material when filling the contents in the state. In the present invention, the non-metallic packaging material has a layer structure in which a paper material layer having a predetermined basis weight, a film substrate, and a sealant layer made of polyethylene having a predetermined thickness are laminated in this order. It is possible to prevent the generation of a seal, to conceal the gusset bag, to prevent the transfer of the sealant odor to the contents, and to easily manufacture a packaging article having an aesthetic appearance.
[0076]
That is, according to the present invention, when the contents that are fluid at a high temperature of 40 ° C. or more and become non-fluid by cooling are filled in a fluid state, peeling or dropping of the opening tape from the packaging material occurs. Difficult gusset bags are provided. Further, according to the present invention, the contents that are fluid at high temperatures and become non-fluid upon cooling are filled into the package in a fluid state, the package filled with the contents is sealed, and the package A gusset bag used as the above-mentioned packaging body in manufacturing a packaged article by cooling the contents filled in the container, and using a non-metallic packaging material, a liquid bite seal and a sealant for the contents There is provided a concealing gusset bag that is less likely to cause odor transfer and that facilitates the manufacture of a packaged article that is excellent in aesthetics.
[Brief description of the drawings]
1A is a perspective view schematically showing a gusset bag according to a first embodiment of the present invention, FIG. 1B is a plan view showing a packaging material constituting the gusset bag shown in FIG. c) Sectional drawing along the AA line of the packaging material shown to (b).
2A is a perspective view schematically showing an example of a structure that can be employed in the gusset bag according to the first embodiment of the present invention, and FIG. 2B is a cross-sectional view of the structure shown in FIG. Figure.
FIG. 3 is a perspective view schematically showing another example of a structure that can be employed in the gusset bag according to the first embodiment of the present invention.
4A and 4B are perspective views schematically showing an example of a gusset bag according to a second embodiment of the present invention, respectively.
FIG. 5 is a cross-sectional view schematically showing a non-metallic packaging material constituting a gusset bag according to a second embodiment of the present invention.
6 is a plan view showing the packaging material used in Example 1. FIG.
7 is a perspective view schematically showing a gusset bag produced in Example 2. FIG.
[Explanation of symbols]
1 ... Gusset bag
1a ... Square tube
1b ... ear
2 ... Cut
11 ... Packaging materials
12 ... Film substrate
13 ... Sealant layer
14 ... Paper material layer
15, 16 ... adhesive layer
17 ... Ink layer
18 ... Opaque varnish layer
21 ... Opening tape
22 ... Tape substrate
23 ... Sealant layer

Claims (8)

Filling the packaging body in a state heated to the first temperature, which is fluid at the first temperature of 40 ° C. or higher and non-flowable by setting the second temperature lower than the first temperature, A gusset bag used as the packaging body in manufacturing a packaged article by sealing the packaging body filled with the content and cooling the content filled in the packaging body to the second temperature. Because
A paper material layer having a basis weight in the range of 10 to 100 g / m ² , a first sealant layer made of polyethylene and having a thickness in the range of 30 μm to 80 μm, the paper material layer, and the first sealant layer A non-metallic packaging material provided with a film base material interposed therebetween, and an opening tape provided with a tape base material and a second sealant layer provided on the tape base material,
The packaging material comprises a square tube in which at least one opening is sealed and the first sealant layer is disposed on the inner side with respect to the film base material, and the opening tape has the second sealant layer as the first sealant. Pasted along the inner periphery of the square tube while contacting the layer,
The gusset bag, wherein the material of the first sealant layer and the material of the second sealant layer are the same type of heat-sealable resin.   The gusset according to claim 1, wherein the combination of the material of the first sealant layer and the material of the second sealant layer is a combination of polyethylene and polyethylene or a combination of polyethylene and ethylene copolymer. bag.   The gusset bag according to claim 1 or 2, wherein the square tube is formed in a cylindrical shape by gluing together a pair of opposite ends of the packaging material. The pair of ends pasted on the palm constitute ears protruding from the back of the square tube,
One end of the unsealing tape is sandwiched between a pair of end portions that are affixed to the palm so that an edge thereof is located between a boundary between the ear and the square tube and an edge of the ear,
The gusset bag according to claim 3, wherein the other end of the opening tape is spaced from the one end of the opening tape and is located on the inner surface of the square tube.   A pair of ears that are located on both sides of the one end of the opening tape and that extend from the edge of the ear to a position between the edge of the ear and the square tube and the edge of the ear. The gusset bag according to claim 4, wherein a cut is provided. The combination of the material of the first sealant layer and the material of the second sealant layer is a combination of polyethylene and an ethylene copolymer,
The ethylene copolymer is one selected from the group consisting of an ionomer, an ethylene-vinyl acetate copolymer, an ethylene-methyl acrylate copolymer, and an ethylene-methacrylic acid copolymer. The gusset bag according to any one of claims 1 to 5.   The film substrate includes a stretched film and a deposition layer formed by depositing at least one compound selected from the group consisting of metal oxides, metal nitrides, and metal fluorides on at least one surface of the stretched film. The gusset bag according to claim 1, wherein the gusset bag is provided.   The gusset bag according to any one of claims 1 to 7, wherein the packaging material further includes a printing pattern on the paper material layer.

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