JP2004196414A

JP2004196414A - Gusset bag

Info

Publication number: JP2004196414A
Application number: JP2002383343A
Authority: JP
Inventors: Toshikazu Kenmochi; 俊和釼持; Kazuhiro Umenaka; 一博梅中
Original assignee: Hosokawa Yoko KK
Current assignee: Hosokawa Yoko KK
Priority date: 2002-12-17
Filing date: 2002-12-17
Publication date: 2004-07-15
Anticipated expiration: 2022-12-17
Also published as: HK1066202A1; CN1513732A; KR101051675B1; JP3460999B1; EP1431207B1; KR20040055619A; CN100430302C; EP1431207A1

Abstract

PROBLEM TO BE SOLVED: To make a gusset bag stably support itself by folding the bottom of the bag without damaging the gusset bag. SOLUTION: The gusset bag has a pair of opposite planes 3 and a pair of side faces 4 formed like pleats and having their creases folded inward correspondingly to each other and connecting side ends of the planes 3. A folding aid 11 for folding the bottom of the gusset bag to easily form a flat surface is formed on the bottom of the gusset bag toward an outer peripheral side of a housing 10 in which contents are to be received. The folding aid 11 comprises a through hole formed on at least one of the plane 3 and the side face 4. The longitudinal axial direction of the through hole is made to coincide with the extending direction of a crease via which the bottom is folded. COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、内部の収容部に内容物を収容させた際に、安定した自立性を発揮するガゼット袋に関する。
【０００２】
【従来の技術】
従来から、自立性の確保された包装袋としては、スタンディングパウチ、フラットボトムタイプのガゼット袋が知られている。これらの包装袋は、高い自立性を確保するために底面部を平坦な部材を用いて形成するなどの工夫がなされている。
【０００３】
一方、平坦な底面部を有しない包装袋についても、包装袋の底部を折り曲げることで、内容物が収容された際に底部を平坦にさせて自立性を確保しているガゼット袋がある。かかるガゼット袋にあっては、ガゼット袋の底部について、内容物が収容される収容部の外側に平面部と側面とを三角形状にヒートシールして、これらヒートシール部に左右に延びるミシン目状の折り曲げ手段を形成し、ガゼット袋の底部を容易に折り曲げることができるように構成したものがすでに開示されている（たとえば、特許文献１参照）。
【０００４】
【特許文献１】特開２００１−１９９４５２号公報
【０００５】
【発明が解決しようとする課題】
しかしながら、折り曲げ手段を上記先行技術のように、左右に延びる直線上に形成すると、この折り曲げ手段が左右に伝播し、ガゼット袋の底部を切り裂いてしまうおそれがある。
【０００６】
本発明は、このような問題点に鑑みなされたものであり、ガゼット袋を損傷させることなく、ガゼット袋の底部を折り曲げさせて、安定した自立性を確保できるガゼット袋を提供する。
【０００７】
【課題を解決するための手段】
本発明では、上記課題を解決するために、対向する一対の平面部と、折り襞状に形成されてその折り線が互いに対応するように内方に折り込まれ、前記平面部の側縁同士を接続している一対の側面部とを有するガゼット袋において、このガゼット袋の底部には、内容物が収容される収容部より外縁側に、当該ガゼット袋の底部を折り曲げて平坦面を容易に形成させる折り曲げ補助部が形成され、この折り曲げ補助部は、少なくとも前記平面部又は前記側面部の一方に形成された貫通孔であり、この貫通孔の長軸方向がこのガゼット袋の底部が折り曲げられる折り線の延びる方向と一致されて形成されているガゼット袋を採用した。
【０００８】
なお、前記折り曲げ補助部は、このガゼット袋の肉厚を減じて凹所を形成することで設けてもよい。また、上記折り曲げ補助部は、複数の微細な孔の集合体からなる粗面部を、少なくとも前記平面部又は前記側面部の一方に形成して設けてもよい。さらに、上記折り曲げ補助部は、このガゼット袋の幅方向に延びる線状切り込みと、この線状切り込みの両端に形成された亀裂伝播防止部とを、少なくとも前記平面部又は前記側面部の一方に形成して設けてもよい。
【０００９】
このように、折り曲げ補助部を設けることで、その部位の剛性が低下され、ガゼット袋の底部が容易に折り曲げられる。底部が折り曲げられることで平坦に形成され、高い自立性をガゼット袋に与えることができる。なお、折り曲げ補助部を、このガゼット袋の幅方向に延びる線状切り込みと、この線状切り込みの両端に形成された亀裂伝播防止部とで設けた場合には、亀裂の発生及び伝播を亀裂伝播防止部が効果的に阻止する。
【００１０】
なお、上記折り曲げ補助部をこのガゼット袋の幅方向に延びる線状切り込みと、この線状切り込みの両端に形成された亀裂伝播防止部とで形成した場合、前記亀裂伝播防止部を、前記線状切り込みと連続する円弧状の切り込みで形成してもよい。この場合、円弧部の端縁部における折線方向をガゼット袋の下方に向くように形成すれば亀裂の伝播を防止し、たとえ亀裂が発生した場合でも、収容部に伝播することを防止できる。
【００１１】
上記ガゼット袋において、前記折り曲げ補助部を、前記側面部に形成された折り線を境として、このガゼット袋の厚み方向に関して片側に位置する平面部又は側面部の少なくとも一方に形成したり、一方の前記平面部と、前記側面部のうち、その中央に形成された折り線より他方の前記平面部側の部位とに形成することで、折り曲げ方向の決定手段としての機能を発揮させることができる。
【００１２】
また、上記ガゼット袋のうち、折り曲げ補助部を凹所を形成することで設けた場合、前記凹所は、前記側面部に貫通孔を形成すると共に、前記平面部をこの側面部に貼り合わせて構成され、前記側面部に形成された貫通孔は、前記平面部により隠蔽されているよう構成するとよい。このように構成することで、良好な外観を有するガゼット袋を簡便に形成できる。
【００１３】
さらに、本発明では上記ガゼット袋において、前記折り曲げ補助部の形成された位置には、前記底部が折り曲げられた際に折り曲げの内側に位置する側の面が、凹状に形成された折り目が、前記折り曲げ補助部と重ね合わされて形成されていることを特徴とする。この折り目を別途設けることで、折り曲げの方向性を決定させることができ、凹状に形成された面を内側にしてガゼット袋の底部を折り曲げることができる。
【００１４】
また、本発明では上記課題を解決するために、対向する一対の平面部と、折り襞状に形成されてその折り線が互いに対応するように内方に折り込まれた一対の側面部とを有し、これら平面部並びに側面部により形成される四つの稜線の内面同士を熱融着して筒体を形成し、さらにこの筒体の上端縁及び下端縁を熱融着すると共に、熱融着された前記下端縁と熱融着された前記稜線とを結ぶように前記平面部と前記側面部の内面同士とそれぞれを熱融着して三角形状のシール部が形成されたガゼット袋において、これら三角形状のシール部のうち、少なくとも一方の前記平面部と側面部とが熱融着されたシール部について、当該ガゼット袋の底部を折り曲げて平坦面を容易に形成させる折り曲げ補助部が形成され、この折り曲げ補助部が、少なくとも１条のミシン目であり、このミシン目は、このガゼット袋の底部が折り曲げられる折り線の形成される位置に設けられた直線部と、この直線部の両端に形成された円弧部とから構成されているガゼット袋を採用した。
【００１５】
さらに上記課題を解決するために、対向する一対の平面部と、折り襞状に形成されてその折り線が互いに対応するように内方に折り込まれた一対の側面部とを有し、これら平面部並びに側面部により形成される四つの稜線の内面同士をヒートシールして筒体を形成し、さらにこの筒体の上端縁及び下端縁をヒートシールすると共に、ヒートシールされた前記下端縁とヒートシールされた前記稜線とを結ぶように前記平面部と前記側面部の内面同士とそれぞれをヒートシールして三角形状のシール部が形成されたガゼット袋において、これら三角形状のシール部のうち、少なくとも一方の前記平面部と側面部とがヒートシールされたシール部について、当該ガゼット袋の底部を折り曲げて平坦面を容易に形成させる折り曲げ補助部が形成され、この折り曲げ補助部は、前記側面部に形成された貫通孔であり、この貫通孔の長軸方向がこのガゼット袋の底部が折り曲げられる折り線の延びる方向と一致されて形成され、この折り曲げ補助部が前記平面部により隠蔽されているガゼット袋を採用した。
【００１６】
【発明の実施の形態】
以下、本発明の実施の形態について図面を参照しながら説明する。
【００１７】
［第１の実施形態］
図１は、本発明の第１の実施形態にかかるガゼット袋１Ａの平面図を示している。このガゼット袋１Ａは、対向する一対の平面部３，３と、この平面部３，３の両側縁同士を接続する一対の側面部４，４とからなる袋本体２Ａを備えている。また、袋本体２Ａの上縁には、内容物を注出させる注出器２０が取り付けられている。
【００１８】
袋本体２Ａを構成する平面部３，３は、矩形状に形成されたフィルム材がそれぞれ使用されており、これらを対向させて袋本体２Ａの前面部と背面部とを構成している。一方、側面部４，４は、矩形状のフィルム材が二つ折りにされて、中央に折り線５，５が設けられるように折り襞状に形成されており、中央の折り線５，５が互いに対向されるようにして配置されている。各平面部３，３の側縁と各側面部４，４の側縁とは熱融着されて、袋本体２Ａの両側部にヒートシール部６，６が形成されている。また、袋本体２Ａの上縁部並びに下縁部についても、これら平面部３，３と側面部４，４とが熱融着されて上部ヒートシール部７並びに下部ヒートシール部８がそれぞれ形成されている。このように平面部３，３と側面部４，４とが熱融着されて、この袋本体２Ａはこれらの内側を内容物の収容させる収容部１０として構成している。
【００１９】
なお、平面部３，３並びに側面部４，４を形成するフィルム材は、複数の部材を積層してなるラミネートフィルムが使用されている。たとえば、袋本体２Ａの外側から、
ＰＥＴ（１２μ）／ＤＬ／Ａｌ（９μ）／ＤＬ／ＯＮ（１５μ）／ＤＬ／ＣＰＰ（５０μ）
又は、
ＰＥＴ（１２μ）／ＤＬ／ＯＮ（１５μ）／ＤＬ／Ａｌ（９μ）／ＤＬ／ＣＰＰ（５０μ）
としたラミネートフィルムが使用されている。
【００２０】
外層は、たとえば、ポリエステル系、ポリアミド系、ポリプロピレン系、ポリカーボネート系、ポリアセタール系等の合成樹脂からなるフィルムを用いることができる。また、これらのフィルムとしては、未延伸フィルムあるいは１軸方向または２軸方向に延伸した延伸フィルム等のいずれのものでも使用することができる。なお、フィルムの厚さとしては必要最低限に保持され得る厚さであればよく、コストなどを勘案して決めればよく、上述した１２μｍのものに限定されず、通常１２〜２５μｍ程度であればよい。また、外層として使用する合成樹脂製フィルムは、その内層側に印刷が施されることもあるために、使用する合成樹脂製フィルムは印刷適性が求められ、１軸方向または２軸方向に延伸した延伸フィルムを使用するとよい。また、必要に応じて合成紙、セロハン、紙、あるいは、不織布等も適宜使用することができる。
【００２１】
一方、内層としては、たとえば、低密度ポリエチレン、中密度ポリエチレン、高密度ポリエチレン、直鎖状（線状）低密度ポリエチレン、エチレン−酢酸ビニル共重合体、アイオノマー樹脂、エチレン−アクリル酸共重合体、エチレン−アクリル酸メチル共重合体、エチレン−メタクリル酸共重合体、ポリプロピレン、エチレン−プロピレン共重合体等の樹脂の一種ないしそれ以上からなる樹脂ないしはこれらをフィルム化したシートを使用することができ、その厚さとしては、３０〜２００μｍが適当である。
【００２２】
さらに、バリヤー層としては、アルミ箔層の他に、たとえば、鉄、銅、錫等の金属箔、あるいは、ポリエチレンテレフタレート、ポリアミド、ポリ塩化ビニル、ポリカーボネート、ポリビニルアルコール、エチレン−酢酸ビニル共重合体ケン化物等のフィルムあるいはこれらにポリ塩化ビニリデンを塗工したフィルムないしはアルミニウムや酸化珪素、酸化アルミニウム、酸化インジウム、酸化錫、酸化ジルコニウム、酸化マグネシウム等の無機物の蒸着を施したフィルムあるいはポリ塩化ビニリデン等のフィルムなどを用いることができる。また、これら基材の一種ないしそれ以上を組み合わせて使用することができる。尚、この基材の厚さとしては、ガセット袋として要求される機能を満たすことができればよく、必要に応じて適宜選ぶことができる。なお、このバリヤー層は、気体遮断性、機械的強靱性、耐屈曲性、耐突き刺し性、耐衝撃性、耐磨耗性、耐寒性、耐熱性、耐薬品性を確保する。
【００２３】
バリヤー性を確保する為に、これらのようにアルミ箔層を設ける代わりに、最外層に蒸着層を設け、
蒸着ＰＥＴ（１２μ）／ＤＬ／ＯＮ（１５μ）／ＤＬ／ＣＰＰ（５０μ）
としたラミネートフィルムを使用してもよい。
【００２４】
蒸着層として、たとえばアルミニウムや酸化珪素、酸化アルミニウム、酸化インジウム、酸化錫、酸化ジルコニウム、酸化マグネシウム等が使用される。
【００２５】
一方、注出器２０は、袋本体２Ａの上縁から内部に挿入されるようにして取り付けられた注出管２１と、この注出管２１の上部に螺合せしめて注出管２１の注出口を密閉させるキャップ２２とから構成されている。この注出器２０は、注出管２１が平面部３，３の上縁同士に挟み込まれ、注出管２１の外周面と平面部３，３の内面との間に隙間が形成されることのないように、ヒートシール部７により相互に密着されている。
【００２６】
袋本体２Ａの底部に設けられたヒートシール部８は、その中間部分８ａに関しては袋本体２Ａの下縁に沿って一定の幅に形成されている。一方、ヒートシール部８の両側部分８ｂ，８ｂは、内部の収容部１０と斜めに境界が形成されるように、その上縁部が両側部のヒートシール部６，６に向けて斜め上方に延びており、三角形状に形成されている。このため収容部１０の下部は袋本体２Ａの下縁から上方に向かうにつれ末広がりに形成させている。
【００２７】
そして、袋本体２Ａの底部には、収容部１０より外縁側に、この底部を容易に折り込ませるための折り曲げ補助部１１，１１が設けられている。なお、このガゼット袋１Ａでは、この折り曲げ補助部１１，１１が、ヒートシール部８の両側部分８ｂ，８ｂにて、熱融着されて平面部３，３に挟み込まれた側面部４，４に貫通孔を形成することで設けている。この折り曲げ補助部１１，１１は、長円状に形成されており、その長軸方向を袋本体２Ａの左右に延びるようにして、側面部４，４に形成されている。即ち、折り曲げ補助部１１，１１の上下の外縁部分は左右に延びる直線をなす一方で、左右両端の外縁部分は円弧状に形成されている。なお、この実施形態では、図２に示すように、側面部４，４のみに長円状の折り曲げ補助部１１，１１を形成し、その外部は平面部３，３によりカバーされている。このため、平面部３，３側から見た場合に、この折り曲げ補助部１１，１１は平面部３，３により隠蔽されている。
【００２８】
なお、図３に示すように、この折り曲げ補助部１１，１１を利用して、対向する平面部３，３同士を互いに貼り合わせてもよい。この折り曲げ補助部１１，１１を、平面部３，３同士の貼合わせ部として兼用することで、袋本体２Ａの底部について、側面部の端縁を切り欠いて、この切り欠かれた部分にて平面同士を貼り合わせていた従来の方法のように別途貼合わせ部を設けることなく、平面部３，３同士を一体にすることができる。
【００２９】
さらに、この袋本体２Ａの底部には、当該底部の折り曲げ部分に対応する位置に、袋本体２Ａの左右に延びる折り目１２が形成されている。この折り目１２は、底部の折り曲げ方向を決定するものであり、図４に示すように、底部が折り曲げられる方向の平面部３，３側が凹部１２ａに、その逆側が凸部１２ｂになるように、袋本体２Ａを型にはめてプレスすることで形成されている。なお、図１では、この折り目１２が、折り曲げ補助部１１，１１の上縁と同位置に形成された態様を示しているが、これに限定されるものではなく、袋本体２Ａの上下方向において、折り曲げ補助部１１，１１と交わる範囲であればいずれの位置に形成してもよい。
【００３０】
図５は、以上の構成を有するガゼット袋１Ａについてその底部を折り曲げた状態を示している。袋本体２Ａの底部は、左右両側に形成された折り曲げ補助部１１，１１によりその剛性が低下されると共に、折り目１２により折り癖が形成されているため、容易に折り曲げられて平坦に形成される。なお、折り目１２は、袋本体２Ａの一面側が凹部１２ａに、他面側が凸部１２ｂに形成されているため、凹部１２ａに形成された面が折り込みの内側に位置するように底部を折り込ませる。そして、一度折り込まれると、折り目１２により形成された折り癖の効果により、袋本体２Ａの底部が元の状態に戻されることも防止し、袋本体２Ａの平坦な状態が維持される。これにより、高い自立性を確保することができる。
【００３１】
なお、折り曲げ補助部１１を形成する部位は、図２に示す態様には限定されない。
【００３２】
図６は、折り曲げ補助部１１を形成する部位の態様を一覧図として表したものである。なお、この図６に示す態様では、折り曲げ補助部１１は、すべて、内容物が収容される収容部１０より袋本体２Ａの外縁側に形成されている。
【００３３】
図６（ａ）は、双方の平面部３ａ，３ｂにのみ長円状の貫通孔１１ａ，１１ａを形成して折り曲げ補助部１１を形成し、各平面部３ａ，３ｂの内面に、側面部４を熱融着した状態を示している。
【００３４】
図６（ｂ）は、側面部４にのみ長円状の貫通孔１１ａ，１１ａを形成して折り曲げ補助部１１を形成したものである。この折り曲げ補助部１１は、側面部４の折り線５を境に、一方の平面部３ａ側に貫通孔１１ａを形成して設けられている。このように、折り線５を境に一方の平面部３ａ側にのみ貫通孔１１ａを形成して折り曲げ補助部１１を設けることで、袋本体２Ａの底部は、この平面部３ａ側を内側に折り込ませる方向に折り曲げ易くなる。即ち、このように折り曲げ補助部１１を形成することで、折り曲げ方向を図の矢印の方向に決定する機能を発揮する。なお、上記の折り目１２の凹部１２ａをこの折り曲げ補助部１１の形成された平面部３ａ側に位置させれば、一層、折り曲げやすい構造となる。
【００３５】
図６（ｃ）は、一方の平面部３ａのみに長円状の貫通孔１１ａを形成して折り曲げ補助部１１を設けた態様を示している。この場合についても、袋本体２Ａの底部は、この平面部３ａ側を内側に折り込ませる方向に折り曲げ易くなる。即ち、折り曲げ方向を矢印の方向に決定する機能を発揮する。なお、この態様に関しても、上記の折り目１２の凹部１２ａをこの折り曲げ補助部１１を構成する貫通孔１１ａの形成された平面部３ａ側に位置させれば、一層、折り曲げやすい構造となる。
【００３６】
図６（ｄ）は、一方の平面部３ｂと、側面部４のうち、その中央に形成された折り線５より他方の平面部３ａ側に位置する部位４ｂとに長円状の貫通孔１１ａ，１１ａをそれぞれ形成して折り曲げ補助部１１を形成している。このように貫通孔１１ａ，１１ａを折り線５にたいして非対称となるように配置させて折り曲げ補助部１１を形成することで、袋本体２Ａ部の底部は一方の平面部側へ相対的に折り曲げやすくなる。即ち、図の矢印の方向へ折り曲げ方向を決定する機能を発揮する。そして、折り目１２の凹部１２ａを他方の平面部３ｂ側へ位置させれば、双方の相乗効果により折れ曲がり容易性を向上させることができる。
【００３７】
図６（ｅ）は、側面部４に形成された折り線５を境として、この袋本体２Ａの厚み方向に関し、片側に位置する平面部３ａ及び側面部４の部位４ａの双方に長円状の貫通孔１１ａを形成して折り曲げ補助部１１を設けている。このように貫通孔１１ａを配置させることで、袋本体２Ａ部の底部は一方の平面部３ａ側へ相対的に折り曲げやすくなる。即ち、図の矢印の方向へ折り曲げ方向を決定する機能を発揮する。そして、この態様についても、折り目１２の凹部１２ａを一方の平面部３ａ側へ位置させれば、双方の相乗効果により折れ曲がり容易性を向上させることができる。
【００３８】
図６（ｆ）は、側面部４に形成された折り線５を境として、この袋本体２Ａの厚み方向に関し、両側に位置する平面部３ａ，３ｂ及び側面部４の双方の部位４ａ，４ｂのいずれにも長円状の貫通孔１１ａ，１１ａを形成して折り曲げ補助部１１を設けている。これにより、袋本体２Ａにはその厚み方向に貫通された貫通孔が形成され、この位置の剛性を低下させている。
【００３９】
以上のように、貫通孔を少なくとも平面部又は側面部の少なくとも一方に形成して種々の折り曲げ補助部を形成することができる。なお、上述のガゼット袋では、長円状の貫通孔で折り曲げ補助部を形成した場合について説明したが、これに限定されるものではなく、矩形状の貫通孔や円形の貫通孔で折り曲げ補助部を形成しても構わない。
【００４０】
［第２の実施形態］
図７は、本発明の第２の実施形態にかかるガゼット袋１Ｂの正面図を示している。
【００４１】
このガゼット袋１Ｂも、対向する一対の平面部３，３及び、折り襞状の一対の側面部４，４から構成される袋本体２Ｂと、袋本体２Ｂの上縁部に取り付けられた、注出管２１並びにキャップ２２からなる注出器２０とから構成されている。なお、この第２の実施形態にかかるガゼット袋１Ｂに関し、第１の実施の形態にかかるガゼット袋１Ａと同様な構成部分については、同符号を付してその説明を省略する。
【００４２】
このガゼット袋１Ｂについても、折り曲げ補助部３０，３０が、袋本体２Ｂの底部の左右両側にて、収容部１０より外縁側の位置に設けられている。この折り曲げ補助部３０，３０は、図８に示すように、双方の平面部３，３に袋本体２Ｂの左右に延びる線状切り込みとその両端に設けられた亀裂伝播防止部とを形成して設けられている。
【００４３】
この折り曲げ補助部３０は、図９に示すように、左右に延びる線状切り込みとしての直線部３１と、この直線部３１の両端部にて下側に向けて円弧状に湾曲された、亀裂伝播防止部としての円弧部３２，３２とから構成されている。
【００４４】
直線部３１は、折り目１２の形成位置と一致されて設けられており（図７参照）、両者の機能を相乗的に発揮させることで、袋本体２Ｂの底部を極めて容易に折り曲げやすくしている。なお、折り目１２は、図１０に示すように、底部が折り曲げられる方向の平面部３側が凹部１２ａに、その逆側が凸部１２ｂになるように、袋本体２Ｂを型にはめてプレスすることで形成される。一方、円弧部３２，３２は直線部３１の両端と連続して、袋本体２Ｂの下方に向けて湾曲するように形成されている。これら円弧部３２，３２の端縁部３３，３３は、各端縁部での接線４５，４５の延びる方向が直線部３１の延びる方向と直角となる位置まで延びている。
【００４５】
このように形成された折り曲げ補助部３０を有するガゼット袋１Ｂでは、袋本体２Ｂの底部が、折り曲げ補助部３０の直線部３１を基線として折り曲げられる。直線部３１が形成されている位置では、折り曲げ補助部３０によりフィルム材の剛性が低下されると共に、折り目１２により折り癖が形成されているため、袋本体２Ｂの底部は、両者の相乗効果により極めて容易に折り込まれる。なお、折り曲げられる方向は、折り目１２の凹部１２ａ、凸部１２ｂが形成される方向により決定される。即ち、折り目１２の凹部１２ａ側が内側に折り込まれる方向に底部は折り込まれる。また、一度折り込まれると、折り目１２により形成された折り癖の効果により、袋本体２Ｂの底部が元の状態に戻されることをも防止し、袋本体２Ｂの平坦な状態が維持される。これにより、高い自立性を確保することができる。
【００４６】
また、直線部３１の両端に形成された亀裂伝播防止部としての円弧部３２，３２は、当該折り曲げ補助部３０から亀裂が発生したり、亀裂が伝播することを効果的に防止している。もし、折り曲げ補助部３０を直線部３１のみで形成した場合、袋本体２Ｂの底部を折り曲げることにより、直線部３１の端縁に応力集中が生じ、直線部３１の端縁から亀裂がするが進展するおそれがある。しかしながら、この実施形態にかかる折り曲げ補助部３０のように直線部３１の両端に円弧部３２，３２を設けているため、円弧部３２，３２が応力集中の生じることを効果的に防止している。なお、円弧部３２，３２の端縁部３３，３３から亀裂が伝播するおそれも若干あるが、たとえ亀裂が生じた場合でも、この端縁部３３，３３での接線４５，４５の方向が袋本体２Ｂの下方に向けられているので、亀裂自体も袋の下方に進展し、内容物の収容された収容部１０に達することは防止される。
【００４７】
なお、折り曲げ補助部は、図１１に示すように形成してもよい。この図１１に示す折り曲げ補助部３０も、折り目１２上に形成された線状切り込みとしての直線部３１と、直縁部３１の両端から袋本体２Ｂの下方に湾曲するように形成された亀裂伝播防止部としての円弧部３４，３４とから構成されている。各円弧部３４，３４は、各端縁部３５，３５における接線４６，４６の延びる方向と、直線部３１とのなす角θが鋭角になる位置まで端縁部３５，３５が円周方向に延ばされている。
【００４８】
この図１１に示す折り曲げ補助部３０についても、円弧部３４，３４が応力集中の発生を防止し、亀裂の発生並びに伝播を効果的に阻止している。
【００４９】
さらに、折り曲げ補助部３０は、連続線により形成された線状切り込みに限定されるものではなく、図１２に示すようにミシン目で形成しても構わない。ミシン目により折り曲げ補助部３０を形成する場合にも、折り目１２上に形成される直線部３１ａと、この直線部３１ａの両端から袋本体２Ｂの下方に湾曲するように形成された円弧部３６，３６とで構成する。
【００５０】
円弧部３６，３６の端縁部３７，３７が設けられる位置は、端縁部３７，３７での接線４７，４７の方向と直線部３１の延びる方向とが直角に形成されるか、あるいは、直角より小さい鋭角に形成される位置まで延びている。
【００５１】
以上、線状切り込みを直線状に形成すると共に、亀裂伝播防止部を円弧状に形成したものについて説明したが、これに限定されるものではない。
【００５２】
図１３は、線状切り込み３８を曲率の大きな円弧状に形成する一方で、亀裂伝播防止部３９，３９を円形にくり抜いて形成した折り曲げ補助部３０の態様を示している。円弧状の線状切り込み３８は、その位置が折り目１２の形成された位置とほぼ一致するようにして形成されている。一方、亀裂伝播防止部３９，３９は、線状切り込み３８の両端にて、この線状切り込み３８と連続するようにして形成されている。このようにして折り曲げ補助部３０を形成した場合でも、袋本体２Ｂの底部を線状切り込み３８の位置で折り曲げることができると共に、円形の亀裂伝播防止部３９，３９が亀裂の発生及び伝播を効果的に阻止する。
【００５３】
さらに、図１４に示すように折り曲げ補助部３０を形成してもよい。
【００５４】
この図１４に示す折り曲げ補助部３０は、曲率の大きな円弧状に形成された線状切り込み４０と、この線状切り込み４０の両端に形成された亀裂伝播防止部としての円弧部４１，４１から構成されている。この亀裂伝播防止部としての円弧部４１，４１は、線状切り込み４０に対して上方に向けて湾曲している。しかしながら、これらの端縁部４２，４２に関しては、その接線の延びる方向が袋本体２Ｂの下向きとなる位置まで円周方向に延ばされている。
【００５５】
以上、折り曲げ補助部を平面部３，３の双方に形成した態様を例に説明したが、この第２の実施形態に関しても、その他に図１５（ａ）〜図１５（ｆ）に示すように少なくとも平面部３ａ，３ｂ又は側面部４の一方に折り曲げ補助部を形成することができる。この場合についても、図１５（ｂ）、図１５（ｃ）、図１５（ｅ）に示すように、袋本体の厚み方向に関し、折り曲げ補助部３０を側面部４に形成された折り線５に対して片側の平面部３ａ側にのみ形成することで、底部の折り曲げ方向を決定する手段として機能させることができる。また、図１５（ｄ）に示すように、一方の平面部３ｄ及び、側面部４のうち折り線５より他方の平面部３ａ側の部位４ａに折り曲げ補助部３０を設けること、即ち、袋本体の厚み方向に関し、折り線５に対して非対称となるように形成することでも、底部の折り曲げ方向を決定する手段として機能させることができる。
【００５６】
［第３の実施形態］
図１６は、本発明の第３の実施形態にかかるガゼット袋ＩＣの平面図を示している。
【００５７】
このガゼット袋１Ｃも、対向する一対の平面部３，３及び、折り襞状の一対の側面部４，４から構成される袋本体２Ｃと、袋本体２Ｃの上縁部に取り付けられた、注出管２１並びにキャップ２２からなる注出器２０とから構成されている。この第３の実施形態にかかるガゼット袋１Ｃに関して、第１の実施形態並びに第２の実施形態にかかるガゼット袋１Ｃと同様の構成部分については、同符号を付してその説明を省略する。
【００５８】
折り曲げ補助部５０，５０は、袋本体２Ｃの底部の左右両側にて、収容部１０より外縁側の位置に設けられている。この折り曲げ補助部５０，５０は、図１６及び図１７に示すように、ヒートシール部８の両側部分８ｂ，８ｂに対応する位置について、平面部３，３の表面に粗面部を形成して設けられている。なお、折り目１２についても、図１８示すように、袋本体２Ｃの底部が折り曲げられる方向の平面部３側が凹部１２ａに、その逆側が凸部１２ｂになるように、袋本体２Ｃを型にはめてプレスすることで形成される。
【００５９】
折り曲げ補助部５０，５０である粗面部は、複数の微細な孔の集合体であり、図１９に示すように、バリヤー層であるアルミ箔層７１より外側のＰＥＴ層７０に微細な非貫通孔を複数形成せしめて構成されている。この折り曲げ補助部５０，５０は、例えば、押圧ローラの表面に所定の粗のサンドペーパーを取り付け、フィルム材をこの押圧ローラに送り込み、その表面にサンドペーパーを押圧することで形成される。なお、この図１９に関し、７０がＰＥＴ層、７１がアルミ箔層、７２がＯＮ層、７３がＣＣＰ層である。
【００６０】
このように、粗面部にて折り曲げ補助部５０，５０を形成した場合でも、この折り曲げ補助部５０，５０の形成された位置はその剛性が低下され、袋本体２Ｃの底部をこの位置で容易に折り曲げることが可能となる。また、折り曲げようとする位置には、折り目１２により折り癖が形成されているため、この折り目と折り曲げ補助部５０，５０の相乗効果により袋本体２Ｃの底部を極めて容易に折り曲げることが可能となる。なお、折り曲げられる方向は、折り目１２の凹部１２ａ、凸部１２ｂが形成される方向により決定される。即ち、折り目１２の凹部１２ａ側が内側に折り込まれる方向に袋本体１２Ｃの底部は折り込まれる。また、一度折り込まれると、折り目により形成された折り癖の効果により、袋本体２Ｃの底部が元の状態に戻されることも防止し、袋本体２Ｃの平坦な状態が維持される。これにより、高い自立性を確保することができる。
【００６１】
なお、外層を蒸着ＰＥＴにした場合には、折り曲げ補助部５０Ａ，５０Ａを、図２０に示すように、外層だけでなくその内層にまで達する孔、あるいは貫通する孔により形成しても構わない。なお、アルミ箔層を使用したフィルム材についても、アルミ箔層より内層まで達する非貫通孔又は貫通孔で粗面部を形成しても構わない。このようにフィルム材を貫通するように微細な孔を形成させても、この折り曲げ補助部５０，５０は収容部より外縁側に設けられているため、内容物に悪影響を与えるおそれはない。なお、この図２０に関し、７４は、蒸着ＰＥＴ層、７２はＯＮ層、７３はＣＣＰ層をそれぞれ表している。
【００６２】
以上、折り曲げ補助部を平面部３，３の双方に形成した態様を例に説明したが、この第３の実施形態に関しても、その他に図２１（ａ）〜図２１（ｆ）に示すように少なくとも平面部３ａ，３ｂ又は側面部４の一方に折り曲げ補助部を形成することができる。この場合についても、図２１（ｂ）、図２１（ｃ）、図２１（ｅ）に示すように、袋本体の厚み方向に関し、折り曲げ補助部５０を側面部４に形成された折り線５に対して片側の平面部３ａ側にのみ形成することで、底部の折り曲げ方向を決定する手段として機能させることができる。また、図２１（ｄ）に示すように、一方の平面部３ｂ及び、側面部４のうち折り線５より他方の平面部３ａ側の部位４ａに折り曲げ補助部３０を設けること、即ち、袋本体の厚み方向に関し、折り線５に対して非対称となるように形成することでも、底部の折り曲げ方向を決定する手段として機能させることができる。
【００６３】
なお、平面部３及び側面部４のいずれのフィルム材にこの折り曲げ補助部を形成する場合でも、各フィルム材の外層側から粗面加工が施される。
【００６４】
以上、第１の実施形態から第３の実施の形態について、折り曲げ補助部を袋本体の下縁部を密封しているヒートシール部８の両側部分８ｂ，８ｂの三角形状に形成された部分に設けた態様を例に説明したが、これには限定されない。例えば、同じ両側部分８ｂ，８ｂでも、収容部１０の下端に対応する位置に設けたり、これより下側に設けても構わない。また、左右両側に分けて設けることに限定されるものでもなく、ヒートシール部８の中間部分８ａに設けたり、ヒートシール部８の全域にわたり、設けても構わない。
【００６５】
なお、これらの折り曲げ補助部は、平面部３として構成されるフィルム材と、これとは別体として設けられた側面部４として構成されるフィルム材とを貼合わさせて袋本体を形成したもの、並びに一枚のフィルム材を折り込んで、平面部３と側面部４とを形成しフィルム材の側縁同士を貼り合わせた背シールタイプのもの、いずれのガゼット袋にも適用させることができる。
【００６６】
【発明の効果】
以上、本発明によれば、袋本体の底部を極めて容易に折り曲げることができ、しかも折り曲げられた状態を確実に維持させておくことができる。これにより、袋本体の底部を平坦にすることができ、安定した自立性を確保する。
【００６７】
また、折り曲げ補助部から亀裂が発生したり、亀裂が伝播することを防止できる。
【００６８】
なお、当該折り曲げ補助部を側面部にのみ形成し、この折り曲げ補助部を平面部で隠蔽する構成を採用することで、外観の良好なガゼット袋を得ることができる。
【図面の簡単な説明】
【図１】本発明の第１の実施形態にかかるガゼット袋の平面図。
【図２】図１のＩＩ−ＩＩ断面を示す拡大断面図。
【図３】折り曲げ補助部を貼り合わせ部として機能させた実施例を示す、図１のＩＩ−ＩＩ断面を示す拡大断面図。
【図４】図１のＩＩＩ−ＩＩＩ断面を示す拡大断面図。
【図５】底面を折り曲げた状態のガゼット袋を底部から見た斜視図。
【図６】折り曲げ補助部の態様をまとめた一覧図。
【図７】本発明の第２の実施形態にかかるガゼット袋の平面図。
【図８】図７のＶＩＩＩ−ＶＩＩＩ断面を示す拡大断面図。
【図９】図７に示すガゼット袋に形成された折り曲げ補助部の一態様を示す図。
【図１０】図７のＸ−Ｘ断面を示す拡大断面図。
【図１１】図９に示す折り曲げ補助部とは別の態様の折り曲げ補助部を示す図。
【図１２】ミシン目で形成された折り曲げ補助部を示す図。
【図１３】線状切り込みを円弧状に形成すると共に、亀裂伝播防止部を円形にくり抜いて形成された折り曲げ補助部を示す図。
【図１４】亀裂伝播防止部を上向きに湾曲させた態様の折り曲げ補助部を示す図。
【図１５】折り曲げ補助部の態様をまとめた一覧図。
【図１６】本発明の第３の実施形態にかかるガゼット袋の平面図。
【図１７】図１６のＸＶＩＩ−ＸＶＩＩ断面を示す拡大断面図。
【図１８】図１６のＸＶＩＩＩ−ＸＶＩＩＩ断面を示す拡大断面図。
【図１９】折り曲げ補助部が形成された部位の拡大断面図。
【図２０】図１９とは別の態様の折り曲げ補助部が形成された部位の拡大断面図。
【図２１】折り曲げ補助部の態様をまとめた一覧図。
【符号の説明】
１Ａ，１Ｂ，１Ｃガゼット袋
２Ａ，２Ｂ，２Ｃ袋本体
３，３ａ，３ｂ平面部
４側面部
５折り線
６，７，８ヒートシール部
１０収容部
１１，３０，５０，５０Ａ折り曲げ補助部
１２折り目
２０注出器
３１直線部（線状切り込み）
３２，３４，３６，４１円弧部（亀裂伝播防止部）[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a gusset bag that exhibits stable autonomy when contents are stored in an internal storage portion.
[0002]
[Prior art]
Conventionally, standing pouches and flat bottom type gusset bags have been known as packaging bags that ensure independence. In order to ensure high independence, these packaging bags are devised such that the bottom surface is formed using a flat member.
[0003]
On the other hand, there is also a gusset bag that does not have a flat bottom surface portion and secures its independence by folding the bottom portion of the packaging bag to flatten the bottom portion when contents are accommodated. In such a gusset bag, the bottom portion of the gusset bag is heat-sealed in a triangular shape with a flat portion and a side surface outside a storage portion in which contents are stored, and a perforated shape extending left and right to the heat seal portion. (See, for example, Patent Document 1) in which a folding means is formed so that the bottom of the gusset bag can be easily bent.
[0004]
[Patent Document 1] JP-A-2001-199452
[0005]
[Problems to be solved by the invention]
However, if the folding means is formed on a straight line extending to the left and right as in the above-described prior art, the folding means may propagate to the left and right, and may tear the bottom of the gusset bag.
[0006]
The present invention has been made in view of such a problem, and provides a gusset bag capable of ensuring stable independence by bending the bottom of the gusset bag without damaging the gusset bag.
[0007]
[Means for Solving the Problems]
In the present invention, in order to solve the above-described problem, a pair of flat portions facing each other, and formed in a fold shape, are folded inward so that the fold lines thereof correspond to each other, and the side edges of the flat portions are joined together. In a gusset bag having a pair of side surfaces connected to each other, the bottom of the gusset bag is easily formed with a flat surface by bending the bottom of the gusset bag closer to the outer edge than a storage portion in which contents are stored. A folding assisting portion is formed, and the folding assisting portion is a through hole formed in at least one of the flat surface portion and the side surface portion, and a long axis direction of the through hole is such that a bottom portion of the gusset bag is folded. A gusset bag formed so as to match the direction in which the line extends was employed.
[0008]
The folding assisting portion may be provided by reducing the thickness of the gusset bag to form a recess. Further, the bending assisting portion may be provided with a rough surface portion formed of an aggregate of a plurality of fine holes formed at least on one of the flat surface portion and the side surface portion. Further, the folding assisting part forms a linear cut extending in the width direction of the gusset bag and a crack propagation preventing part formed at both ends of the linear cut at least in one of the flat part or the side part. It may be provided.
[0009]
Thus, by providing the folding auxiliary portion, the rigidity of the portion is reduced, and the bottom of the gusset bag is easily bent. The bottom portion is flattened by being bent, so that the gusset bag can be given a high degree of independence. When the bending assisting portion is provided with a linear cut extending in the width direction of the gusset bag and crack propagation preventing portions formed at both ends of the linear cut, the generation and propagation of the crack are prevented. The prevention part effectively blocks.
[0010]
When the folding assist portion is formed by a linear cut extending in the width direction of the gusset bag and a crack propagation preventing portion formed at both ends of the linear cut, the crack propagation preventing portion is formed by the linear cutting. It may be formed by an arc-shaped cut continuous with the cut. In this case, if the fold line direction at the edge of the arc portion is formed so as to face downward of the gusset bag, the propagation of cracks can be prevented, and even if a crack occurs, it can be prevented from propagating to the accommodation portion.
[0011]
In the gusset bag, the bending assisting portion may be formed on at least one of a plane portion or a side portion located on one side in a thickness direction of the gusset bag, with a fold line formed on the side portion as a boundary, or one of the By forming the flat portion and the side portion on the other flat portion side of the folding line formed at the center of the flat portion, a function as a bending direction determining means can be exhibited.
[0012]
Further, in the gusset bag, when the folding auxiliary portion is provided by forming a concave portion, the concave portion forms a through hole in the side surface portion, and the flat portion is bonded to the side surface portion. It is preferable that the through hole formed in the side surface is configured to be hidden by the flat surface. With this configuration, a gusset bag having a good appearance can be easily formed.
[0013]
Further, in the present invention, in the gusset bag, at the position where the folding auxiliary portion is formed, the surface on the side located inside the folding when the bottom portion is bent, the fold formed in a concave shape, It is characterized by being formed so as to be superposed on the folding assisting portion. By separately providing this fold, the direction of bending can be determined, and the bottom of the gusset bag can be bent with the concave surface formed inside.
[0014]
In order to solve the above problem, the present invention has a pair of flat portions facing each other and a pair of side portions formed in a fold shape and folded inward so that fold lines thereof correspond to each other. Then, the inner surfaces of the four ridge lines formed by the flat portion and the side portions are heat-sealed to form a cylinder, and the upper and lower edges of the cylinder are heat-sealed. In the gusset bag in which the triangular-shaped seal portion is formed by heat-sealing the inner surfaces of the flat surface portion and the side surface portions so as to connect the lower end edge and the heat-sealed ridge line, respectively. Among the triangular shaped seal portions, at least one of the flat portion and the side portion is heat-sealed, and a folding auxiliary portion for easily forming a flat surface by bending the bottom of the gusset bag is formed, This folding auxiliary part has few Each of the perforations is a single perforation. The perforation includes a straight portion provided at a position where a fold line at which the bottom of the gusset bag is bent is formed, and arc portions formed at both ends of the straight portion. The configured gusset bag was adopted.
[0015]
In order to further solve the above-described problem, a pair of flat portions facing each other and a pair of side portions formed in a fold shape and folded inward so that fold lines thereof correspond to each other are provided. The inner surface of the four ridges formed by the portion and the side portion is heat-sealed with each other to form a cylinder, and the upper and lower edges of the cylinder are heat-sealed, and the heat-sealed lower edge and the lower edge are heated. In a gusset bag in which a triangular seal portion is formed by heat-sealing the flat surface portion and the inner surface of the side portion so as to connect the sealed ridge line, at least one of these triangular seal portions, One of the flat portion and the side portion is heat-sealed, and a folding auxiliary portion for easily forming a flat surface by bending the bottom of the gusset bag is formed, Is a through hole formed in the side surface portion, and a long axis direction of the through hole is formed so as to coincide with a direction in which a folding line at which the bottom of the gusset bag is bent extends. Adopted a gusset bag concealed by the flat portion.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0017]
[First Embodiment]
FIG. 1 shows a plan view of a gusset bag 1A according to the first embodiment of the present invention. The gusset bag 1A includes a bag body 2A including a pair of opposed flat portions 3, 3 and a pair of side portions 4, 4 connecting both side edges of the flat portions 3, 3. A dispenser 20 for dispensing the contents is attached to the upper edge of the bag body 2A.
[0018]
The plane portions 3 constituting the bag main body 2A are formed of rectangular film materials, respectively, and the front and rear portions of the bag main body 2A are constituted by facing these. On the other hand, the side surface parts 4 and 4 are formed in a fold shape such that a rectangular film material is folded in two and folding lines 5 and 5 are provided in the center. They are arranged so as to face each other. The side edges of the flat portions 3 and 3 and the side edges of the side portions 4 and 4 are heat-sealed to form heat seal portions 6 and 6 on both sides of the bag body 2A. The upper and lower edges of the bag body 2A are also thermally fused to the flat portions 3, 3 and the side portions 4, 4 to form the upper heat seal portion 7 and the lower heat seal portion 8, respectively. ing. As described above, the flat portions 3 and 3 and the side portions 4 and 4 are heat-sealed, and the bag body 2A is configured as an accommodating portion 10 for accommodating the inside thereof.
[0019]
In addition, as the film material for forming the plane portions 3 and 3 and the side portions 4 and 4, a laminated film formed by laminating a plurality of members is used. For example, from the outside of the bag body 2A,
PET (12μ) / DL / Al (9μ) / DL / ON (15μ) / DL / CPP (50μ)
Or
PET (12μ) / DL / ON (15μ) / DL / Al (9μ) / DL / CPP (50μ)
Laminated film is used.
[0020]
As the outer layer, for example, a film made of a synthetic resin such as polyester, polyamide, polypropylene, polycarbonate, and polyacetal can be used. Further, as these films, any of unstretched films or stretched films stretched in a uniaxial or biaxial direction can be used. The thickness of the film may be any thickness that can be held to the minimum necessary, and may be determined in consideration of cost and the like, and is not limited to the above-described 12 μm, and is generally about 12 to 25 μm. Good. Further, since the synthetic resin film used as the outer layer may be printed on the inner layer side, the synthetic resin film used is required to have printability, and is stretched in the uniaxial or biaxial direction. A stretched film may be used. In addition, synthetic paper, cellophane, paper, non-woven fabric, or the like can be used as needed.
[0021]
On the other hand, as the inner layer, for example, low density polyethylene, medium density polyethylene, high density polyethylene, linear (linear) low density polyethylene, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-acrylic acid copolymer, Ethylene-methyl acrylate copolymer, ethylene-methacrylic acid copolymer, polypropylene, a resin consisting of one or more of resins such as ethylene-propylene copolymer or a sheet made of these can be used, An appropriate thickness is 30 to 200 μm.
[0022]
Further, as the barrier layer, in addition to the aluminum foil layer, for example, metal foil such as iron, copper, and tin, or polyethylene terephthalate, polyamide, polyvinyl chloride, polycarbonate, polyvinyl alcohol, ethylene-vinyl acetate copolymer ken Film of polyvinylidene chloride or a film coated with polyvinylidene chloride or a film on which an inorganic substance such as aluminum, silicon oxide, aluminum oxide, indium oxide, tin oxide, zirconium oxide, or magnesium oxide is deposited, or a film of polyvinylidene chloride or the like. A film or the like can be used. Further, one or more of these base materials can be used in combination. The thickness of the base material may be any thickness as long as the function required for the gusset bag can be satisfied, and may be appropriately selected as needed. The barrier layer ensures gas barrier properties, mechanical toughness, bending resistance, puncture resistance, impact resistance, abrasion resistance, cold resistance, heat resistance, and chemical resistance.
[0023]
In order to ensure barrier properties, instead of providing an aluminum foil layer like these, a vapor deposition layer is provided on the outermost layer,
Evaporated PET (12μ) / DL / ON (15μ) / DL / CPP (50μ)
A laminated film may be used.
[0024]
As the deposition layer, for example, aluminum, silicon oxide, aluminum oxide, indium oxide, tin oxide, zirconium oxide, magnesium oxide, or the like is used.
[0025]
On the other hand, the pouring device 20 has a pouring tube 21 attached so as to be inserted from the upper edge of the bag body 2A into the inside, and a spout of the pouring tube 21 which is screwed onto the pouring tube 21 and screwed. And a cap 22 for hermetic sealing. In the spout 20, the spout tube 21 is sandwiched between the upper edges of the flat portions 3, 3, and a gap is formed between the outer peripheral surface of the spout tube 21 and the inner surface of the flat portions 3, 3. So that they are not in contact with each other.
[0026]
The heat seal portion 8 provided at the bottom of the bag body 2A has a constant width along the lower edge of the bag body 2A with respect to the intermediate portion 8a. On the other hand, both side portions 8b and 8b of the heat seal portion 8 have their upper edges diagonally upward toward the heat seal portions 6 and 6 on both sides so that a boundary is formed diagonally with the inner accommodating portion 10. It extends and is formed in a triangular shape. For this reason, the lower part of the storage part 10 is formed so as to expand toward the upper side from the lower edge of the bag body 2A.
[0027]
Further, on the bottom of the bag body 2A, on the outer edge side of the accommodating portion 10, folding assist portions 11, 11 for easily folding the bottom are provided. In the gusset bag 1 A, the folding assisting portions 11, 11 are heat-sealed at both side portions 8 b, 8 b of the heat sealing portion 8 to the side portions 4, 4 sandwiched between the flat portions 3, 3. It is provided by forming a through hole. The folding assisting portions 11 and 11 are formed in an oval shape, and are formed on the side portions 4 and 4 so that the major axis direction extends to the left and right of the bag body 2A. That is, the upper and lower outer edges of the folding assisting portions 11 and 11 form a straight line extending left and right, while the outer edges at the left and right ends are formed in an arc shape. In this embodiment, as shown in FIG. 2, elliptical bending assisting portions 11 are formed only on the side portions 4, and the outside thereof is covered by the flat portions 3. For this reason, when viewed from the side of the flat portions 3, 3, the folding assist portions 11 are concealed by the flat portions 3.
[0028]
As shown in FIG. 3, the opposing flat portions 3 may be bonded to each other by using the bending assist portions 11. By using the bending assisting portions 11 and 11 also as a bonding portion between the flat portions 3 and 3, the edge of the side portion of the bottom portion of the bag body 2A is cut out, and the cutout portion is formed. Unlike the conventional method in which planes are bonded to each other, the plane parts 3 and 3 can be integrated without providing a separate bonding part.
[0029]
Further, at the bottom of the bag body 2A, folds 12 extending to the left and right of the bag body 2A are formed at positions corresponding to the bent portions of the bottom. The fold 12 determines the bending direction of the bottom, and as shown in FIG. 4, the flat portions 3, 3 in the direction in which the bottom is bent are formed in the concave portion 12 a and the opposite side is formed in the convex portion 12 b. It is formed by pressing the bag body 2A in a mold. In addition, FIG. 1 shows a mode in which the fold line 12 is formed at the same position as the upper edges of the folding auxiliary portions 11, 11. However, the present invention is not limited to this, and the vertical direction of the bag body 2 A is not limited to this. Alternatively, it may be formed at any position as long as it intersects with the bending assist portions 11 and 11.
[0030]
FIG. 5 shows a state in which the bottom of the gusset bag 1A having the above configuration is bent. The rigidity of the bottom of the bag body 2A is reduced by the folding assisting portions 11, 11 formed on both the left and right sides, and the folding habit is formed by the fold 12, so that the bottom is easily bent and formed flat. . The fold 12 is formed such that one side of the bag body 2A is formed in the concave portion 12a and the other side is formed in the convex portion 12b, so that the bottom portion is folded so that the surface formed in the concave portion 12a is located inside the fold. Once folded, the bottom of the bag body 2A is also prevented from returning to its original state due to the effect of the fold formed by the fold 12, and the flat state of the bag body 2A is maintained. Thereby, high independence can be secured.
[0031]
In addition, the site | part which forms the bending assistance part 11 is not limited to the aspect shown in FIG.
[0032]
FIG. 6 is a view showing a list of the forms of the portions where the folding assisting portions 11 are formed. In the embodiment shown in FIG. 6, the folding assisting portions 11 are all formed on the outer edge side of the bag body 2A with respect to the accommodating portion 10 for accommodating the contents.
[0033]
FIG. 6A shows that the bending assisting portion 11 is formed by forming the oval through holes 11a, 11a only in the two flat portions 3a, 3b, and the side surface portion 4 is formed on the inner surface of each of the flat portions 3a, 3b. Shows a state in which is thermally fused.
[0034]
FIG. 6 (b) shows an elliptical through-hole 11 a formed only in the side surface portion 4, and the folding assisting portion 11 is formed. The folding assisting portion 11 is provided with a through hole 11a formed on one flat surface portion 3a side with respect to the folding line 5 of the side surface portion 4. As described above, by forming the through-hole 11a only on the one flat portion 3a side with the folding line 5 as a boundary and providing the bending auxiliary portion 11, the bottom portion of the bag body 2A folds the flat portion 3a side inward. It becomes easy to bend in the direction to make. That is, by forming the bending assisting portion 11 in this manner, a function of determining the bending direction in the direction of the arrow in the drawing is exhibited. If the concave portion 12a of the fold 12 is located on the side of the flat portion 3a on which the folding assisting portion 11 is formed, the structure becomes easier to bend.
[0035]
FIG. 6C shows an embodiment in which an elliptical through-hole 11a is formed only in one of the flat portions 3a and the folding auxiliary portion 11 is provided. Also in this case, the bottom of the bag body 2A can be easily bent in a direction in which the flat portion 3a is folded inward. That is, a function of determining the bending direction in the direction of the arrow is exhibited. Also in this embodiment, if the concave portion 12a of the fold 12 is located on the side of the plane portion 3a where the through hole 11a constituting the folding assisting portion 11 is formed, the structure becomes easier to bend.
[0036]
FIG. 6D shows an oval through-hole 11 a in one flat portion 3 b and a portion 4 b of the side surface portion 4 located on the other flat portion 3 a side from the folding line 5 formed in the center thereof. , 11a are respectively formed to form the folding assisting portion 11. In this way, by disposing the through holes 11a, 11a so as to be asymmetrical with respect to the folding line 5 and forming the folding assisting portion 11, the bottom of the bag body 2A can be relatively easily folded toward one flat surface. . That is, the function of determining the bending direction in the direction of the arrow in the figure is exhibited. If the concave portion 12a of the fold 12 is positioned on the other flat surface portion 3b side, it is possible to improve the ease of bending due to a synergistic effect of both.
[0037]
FIG. 6E shows that, with respect to the thickness direction of the bag body 2 A with respect to the folding line 5 formed on the side surface portion 4, both the flat portion 3 a located on one side and the portion 4 a of the side surface portion 4 have oval shapes. Are formed to provide the bending assisting portion 11. By arranging the through holes 11a in this manner, the bottom of the bag body 2A can be relatively easily bent toward the one flat surface 3a. That is, the function of determining the bending direction in the direction of the arrow in the figure is exhibited. Also in this embodiment, if the concave portion 12a of the fold 12 is positioned on the side of the one flat portion 3a, the bendability can be improved by the synergistic effect of both.
[0038]
FIG. 6 (f) shows both portions 4 a, 4 b of the flat portions 3 a, 3 b and the side portions 4 located on both sides in the thickness direction of the bag body 2 A with respect to the folding line 5 formed on the side portion 4. In all of the above, the bending auxiliary portions 11 are provided by forming the oval through holes 11a, 11a. Thereby, a through hole is formed in the bag body 2A in the thickness direction thereof, and the rigidity at this position is reduced.
[0039]
As described above, by forming the through hole in at least one of the plane portion and the side surface portion, it is possible to form various folding assisting portions. In the above-mentioned gusset bag, the case where the bending assisting portion is formed by an oval through hole is described. However, the present invention is not limited to this, and the bending assisting portion is formed by a rectangular through hole or a circular through hole. May be formed.
[0040]
[Second embodiment]
FIG. 7 shows a front view of a gusset bag 1B according to the second embodiment of the present invention.
[0041]
This gusset bag 1B also has a bag body 2B composed of a pair of opposing flat portions 3 and 3 and a pair of fold-shaped side portions 4 and 4, and a note attached to the upper edge of the bag body 2B. An outlet pipe 21 and a pouring device 20 including a cap 22 are provided. Regarding the gusset bag 1B according to the second embodiment, the same components as those of the gusset bag 1A according to the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.
[0042]
Also in the gusset bag 1B, the folding assisting portions 30, 30 are provided on the left and right sides of the bottom of the bag main body 2B at positions on the outer edge side of the housing portion 10. As shown in FIG. 8, the folding assist portions 30, 30 are formed by forming linear cuts extending in the left and right directions of the bag body 2 B on both flat portions 3, and crack propagation preventing portions provided at both ends thereof. Is provided.
[0043]
As shown in FIG. 9, the bending assisting portion 30 includes a linear portion 31 as a linear cut extending in the left and right directions, and a crack propagating downward in an arc shape at both ends of the linear portion 31. It is composed of arc portions 32, 32 as a preventing portion.
[0044]
The straight portion 31 is provided so as to coincide with the position where the fold 12 is formed (see FIG. 7), and the bottom portion of the bag body 2B is extremely easily bent by synergistically exhibiting the functions of both. . As shown in FIG. 10, the fold 12 is formed by pressing the bag main body 2B into a mold such that the flat portion 3 in the direction in which the bottom is bent is the concave portion 12a and the opposite side is the convex portion 12b. It is formed. On the other hand, the arc portions 32, 32 are formed so as to be continuous with both ends of the straight portion 31 and to be curved downward of the bag body 2B. The ends 33 of the arc portions 32 extend to a position where the direction in which the tangent lines 45 extend at each end is perpendicular to the direction in which the straight portion 31 extends.
[0045]
In the gusset bag 1B having the folding assisting portion 30 formed as described above, the bottom of the bag body 2B is folded with the straight portion 31 of the folding assisting portion 30 as a base line. At the position where the straight portion 31 is formed, the rigidity of the film material is reduced by the bending assisting portion 30 and the folding habit is formed by the fold 12. It is folded very easily. The bending direction is determined by the direction in which the concave portion 12a and the convex portion 12b of the fold 12 are formed. That is, the bottom is folded in the direction in which the concave portion 12a side of the fold 12 is folded inward. Further, once folded, the bottom of the bag body 2B is also prevented from returning to the original state due to the effect of the fold formed by the fold 12, and the flat state of the bag body 2B is maintained. Thereby, high independence can be secured.
[0046]
Further, the arcuate portions 32, 32 formed at both ends of the straight portion 31 as the crack propagation preventing portions effectively prevent cracks from being generated from the bending assisting portions 30 and propagation of the cracks. If the folding assisting portion 30 is formed only of the straight portion 31, the concentration of stress occurs at the edge of the straight portion 31 by bending the bottom of the bag body 2B, and the crack is generated from the edge of the straight portion 31. There is a possibility that. However, since the arc portions 32, 32 are provided at both ends of the straight portion 31 as in the bending assist portion 30 according to this embodiment, the arc portions 32, 32 are effectively prevented from causing stress concentration. . Although there is a slight possibility that a crack may propagate from the edges 33, 33 of the arc portions 32, 32, even if a crack occurs, the direction of the tangents 45, 45 at the edges 33, 33 is not changed. Since the crack is directed to the lower side of the main body 2B, the crack itself also extends to the lower side of the bag, and is prevented from reaching the storage portion 10 in which the contents are stored.
[0047]
Note that the bending assisting portion may be formed as shown in FIG. The folding assisting portion 30 shown in FIG. 11 also has a linear portion 31 formed as a linear cut formed on the fold 12, and a crack propagation formed so as to be curved downward from both ends of the right edge portion 31 to the bag body 2B. It is composed of arc portions 34 as an preventing portion. Each of the arc portions 34, 34 extends in the circumferential direction until the angle θ between the extending direction of the tangent lines 46, 46 at each of the edge portions 35, 35 and the straight portion 31 becomes an acute angle. Has been extended.
[0048]
Also in the bending assisting portion 30 shown in FIG. 11, the arc portions 34, 34 prevent the occurrence of stress concentration and effectively prevent the generation and propagation of cracks.
[0049]
Further, the folding assisting section 30 is not limited to a linear cut formed by a continuous line, and may be formed by a perforation as shown in FIG. Also in the case where the folding assisting portion 30 is formed by a perforation, a straight portion 31a formed on the fold 12 and an arc portion 36 formed so as to be curved from both ends of the straight portion 31a downward to the bag body 2B, 36.
[0050]
The position where the edge portions 37, 37 of the arc portions 36, 36 are provided may be such that the direction of the tangent lines 47, 47 at the edge portions 37, 37 and the direction in which the linear portion 31 extends are formed at right angles, or It extends to a position formed at an acute angle smaller than a right angle.
[0051]
As described above, the linear cut is formed linearly and the crack propagation preventing portion is formed in an arc shape. However, the present invention is not limited to this.
[0052]
FIG. 13 shows an embodiment of the bending assisting portion 30 in which the linear cut 38 is formed in an arc shape having a large curvature, and the crack propagation preventing portions 39, 39 are hollowed out in a circular shape. The arc-shaped linear cut 38 is formed such that its position substantially coincides with the position where the fold 12 is formed. On the other hand, the crack propagation preventing portions 39, 39 are formed at both ends of the linear cut 38 so as to be continuous with the linear cut 38. Even when the folding assisting portion 30 is formed in this manner, the bottom of the bag body 2B can be bent at the position of the linear cut 38, and the circular crack propagation preventing portions 39, 39 can effectively prevent the generation and propagation of cracks. To block.
[0053]
Further, as shown in FIG. 14, a bending assisting portion 30 may be formed.
[0054]
The bending assisting portion 30 shown in FIG. 14 includes a linear cut 40 formed in an arc shape having a large curvature, and circular arc portions 41, 41 formed at both ends of the linear cut 40 as crack preventing portions. Have been. The arc portions 41, 41 as the crack propagation preventing portions are curved upward with respect to the linear cuts 40. However, with respect to these edge portions 42, 42, the tangential line extends in the circumferential direction to a position where the bag body 2B is directed downward.
[0055]
As described above, the embodiment in which the folding assisting portions are formed on both the plane portions 3 and 3 has been described as an example. However, also in the second embodiment, as shown in FIGS. 15A to 15F. A folding auxiliary part can be formed on at least one of the plane parts 3a, 3b or the side part 4. Also in this case, as shown in FIGS. 15 (b), 15 (c), and 15 (e), the folding assist portion 30 is attached to the folding line 5 formed on the side surface portion 4 in the thickness direction of the bag body. On the other hand, by forming it only on one side of the flat portion 3a, it can function as a means for determining the bending direction of the bottom portion. Further, as shown in FIG. 15 (d), the folding auxiliary part 30 is provided on the one flat part 3d and the part 4a of the side part 4 on the other flat part 3a side from the fold line 5, that is, the bag body. The thickness direction can be made to be asymmetrical with respect to the folding line 5 so that it can function as a means for determining the bending direction of the bottom.
[0056]
[Third Embodiment]
FIG. 16 is a plan view of a gusset bag IC according to the third embodiment of the present invention.
[0057]
This gusset bag 1C also has a bag body 2C composed of a pair of opposed flat portions 3 and 3 and a pair of fold-shaped side portions 4 and 4, and a note attached to the upper edge of the bag body 2C. An outlet pipe 21 and a pouring device 20 including a cap 22 are provided. Regarding the gusset bag 1C according to the third embodiment, the same components as those of the gusset bag 1C according to the first embodiment and the second embodiment are denoted by the same reference numerals and description thereof is omitted.
[0058]
The folding assisting portions 50, 50 are provided at positions on the outer edge side of the housing portion 10 on both left and right sides of the bottom of the bag body 2C. As shown in FIGS. 16 and 17, the folding assisting portions 50, 50 are provided by forming rough surfaces on the surfaces of the flat portions 3, 3 at positions corresponding to both side portions 8 b, 8 b of the heat sealing portion 8. Have been. As for the fold 12, as shown in FIG. 18, the bag body 2C is molded so that the flat portion 3 in the direction in which the bottom of the bag body 2C is bent is the concave portion 12a and the opposite side is the convex portion 12b. It is formed by pressing.
[0059]
The rough surface portion as the folding assisting portions 50, 50 is an aggregate of a plurality of fine holes, and as shown in FIG. 19, a fine non-through hole is formed in the PET layer 70 outside the aluminum foil layer 71 as a barrier layer. Are formed. The folding assisting portions 50 are formed, for example, by attaching a predetermined rough sandpaper to the surface of a pressing roller, feeding a film material to the pressing roller, and pressing the sandpaper against the surface. 19, 70 is a PET layer, 71 is an aluminum foil layer, 72 is an ON layer, and 73 is a CCP layer.
[0060]
As described above, even when the folding assisting portions 50, 50 are formed on the rough surface portion, the rigidity of the position where the folding assisting portions 50, 50 are formed is reduced, and the bottom of the bag body 2C can be easily moved at this position. It becomes possible to bend. In addition, since a fold is formed by the fold 12 at the position where the fold is to be made, the bottom of the bag body 2C can be extremely easily bent by the synergistic effect of the fold and the folding auxiliary portions 50, 50. . The bending direction is determined by the direction in which the concave portion 12a and the convex portion 12b of the fold 12 are formed. That is, the bottom of the bag body 12C is folded in the direction in which the concave portion 12a side of the fold 12 is folded inward. Further, once folded, the bottom of the bag body 2C is prevented from returning to the original state due to the effect of the fold formed by the fold, and the flat state of the bag body 2C is maintained. Thereby, high independence can be secured.
[0061]
In the case where the outer layer is made of vapor-deposited PET, the folding assisting portions 50A, 50A may be formed by holes reaching not only the outer layer but also the inner layer or through holes as shown in FIG. In the case of a film material using an aluminum foil layer, a rough surface may be formed by a non-through hole or a through hole extending from the aluminum foil layer to the inner layer. Even if a fine hole is formed so as to penetrate the film material in this manner, since the folding auxiliary portions 50 are provided on the outer edge side of the accommodation portion, there is no possibility that the contents are adversely affected. In FIG. 20, reference numeral 74 denotes a deposited PET layer, 72 denotes an ON layer, and 73 denotes a CCP layer.
[0062]
As described above, the embodiment in which the folding assisting portions are formed on both the flat portions 3 and 3 has been described as an example. However, as for the third embodiment, as shown in FIGS. 21 (a) to 21 (f). A folding auxiliary part can be formed on at least one of the plane parts 3a, 3b or the side part 4. Also in this case, as shown in FIGS. 21 (b), 21 (c), and 21 (e), the folding assisting portion 50 is attached to the folding line 5 formed on the side surface portion 4 in the thickness direction of the bag body. On the other hand, by forming it only on one side of the flat portion 3a, it can function as a means for determining the bending direction of the bottom portion. Further, as shown in FIG. 21 (d), the folding auxiliary part 30 is provided at the part 4a of the one flat part 3b and the side part 4a on the other flat part 3a side from the fold line 5, that is, the bag body. The thickness direction can be made to be asymmetrical with respect to the folding line 5 so that it can function as a means for determining the bending direction of the bottom.
[0063]
In the case where the bending assisting portion is formed on any one of the flat portion 3 and the side portion 4, the rough surface is formed from the outer layer side of each film material.
[0064]
As described above, in the first embodiment to the third embodiment, the folding auxiliary portions are formed on the triangular portions of both side portions 8b, 8b of the heat seal portion 8 sealing the lower edge portion of the bag body. Although the provided mode has been described as an example, the present invention is not limited to this. For example, the same side portions 8b, 8b may be provided at a position corresponding to the lower end of the housing portion 10 or may be provided below the same. Further, the present invention is not limited to being provided separately on the left and right sides, and may be provided in the intermediate portion 8a of the heat seal portion 8 or may be provided over the entire area of the heat seal portion 8.
[0065]
In addition, these folding auxiliary parts are formed by laminating a film material configured as the flat surface part 3 and a film material configured as the side surface part 4 provided separately therefrom to form a bag body. A back seal type in which a flat film portion is formed by folding a single film material to form a plane portion 3 and a side surface portion 4 and the side edges of the film material are bonded to each other, can be applied to any gusset bag.
[0066]
【The invention's effect】
As described above, according to the present invention, the bottom of the bag body can be extremely easily bent, and the bent state can be reliably maintained. Thereby, the bottom of the bag body can be flattened, and stable self-sustainability is secured.
[0067]
Further, it is possible to prevent a crack from being generated from the bending assisting portion or to prevent the crack from propagating.
[0068]
Note that a gusset bag with good appearance can be obtained by adopting a configuration in which the folding auxiliary portion is formed only on the side surface portion and the folding auxiliary portion is hidden by a flat surface portion.
[Brief description of the drawings]
FIG. 1 is a plan view of a gusset bag according to a first embodiment of the present invention.
FIG. 2 is an enlarged sectional view showing a II-II section of FIG.
FIG. 3 is an enlarged cross-sectional view showing an example in which a folding assisting part functions as a bonding part, which is taken along the line II-II of FIG. 1;
FIG. 4 is an enlarged sectional view showing a III-III section of FIG. 1;
FIG. 5 is a perspective view of the gusset bag in a state where the bottom surface is bent, as viewed from the bottom.
FIG. 6 is a list diagram summarizing aspects of a folding assisting unit.
FIG. 7 is a plan view of a gusset bag according to a second embodiment of the present invention.
FIG. 8 is an enlarged cross-sectional view showing a VIII-VIII cross section of FIG. 7;
FIG. 9 is a view showing one embodiment of a folding assisting portion formed on the gusset bag shown in FIG. 7;
FIG. 10 is an enlarged sectional view showing a section taken along line XX of FIG. 7;
FIG. 11 is a view showing a folding assisting unit in another mode different from the folding assisting unit shown in FIG. 9;
FIG. 12 is a diagram showing a bending assisting portion formed at a perforation;
FIG. 13 is a view showing a bending assisting portion formed by forming a linear cut into an arc shape and hollowing out a crack propagation preventing portion in a circular shape.
FIG. 14 is a diagram illustrating a bending assisting portion in which the crack propagation preventing portion is curved upward.
FIG. 15 is a list diagram summarizing modes of a folding assisting unit.
FIG. 16 is a plan view of a gusset bag according to a third embodiment of the present invention.
FIG. 17 is an enlarged sectional view showing a section taken along line XVII-XVII of FIG. 16;
FIG. 18 is an enlarged sectional view showing a section taken along line XVIII-XVIII in FIG. 16;
FIG. 19 is an enlarged cross-sectional view of a portion where a bending assisting portion is formed.
FIG. 20 is an enlarged cross-sectional view of a portion where a bending assisting portion in a different mode from FIG. 19 is formed.
FIG. 21 is a list view summarizing modes of a folding assisting unit.
[Explanation of symbols]
1A, 1B, 1C gusset bag
2A, 2B, 2C Bag body
3,3a, 3b flat part
4 side parts
5 folding line
6,7,8 Heat seal part
10 accommodation
11,30,50,50A Bending auxiliary part
12 folds
20 Dispenser
31 Straight part (linear cut)
32, 34, 36, 41 Circular part (crack propagation prevention part)

Claims

A gusset having a pair of opposed flat portions and a pair of side portions formed in a fold shape and folded inward so that fold lines thereof correspond to each other and connecting side edges of the flat portions. In the bag,
At the bottom of the gusset bag, a folding auxiliary portion is formed on the outer edge side of the storage portion where the contents are stored, by bending the bottom of the gusset bag to easily form a flat surface,
This bending assisting portion is a through hole formed in at least one of the flat portion or the side portion,
A gusset bag characterized in that a long axis direction of the through hole is formed so as to coincide with a direction in which a folding line at which a bottom portion of the gusset bag is bent extends.

A gusset having a pair of opposed flat portions and a pair of side portions formed in a fold shape and folded inward so that fold lines thereof correspond to each other and connecting side edges of the flat portions. In the bag,
At the bottom of the gusset bag, a folding auxiliary portion is formed on the outer edge side of the storage portion where the contents are stored, by bending the bottom of the gusset bag to easily form a flat surface,
The gusset bag, wherein the folding assisting portion is a recess in which the thickness of the gusset bag is reduced.

A gusset having a pair of opposed flat portions and a pair of side portions formed in a fold shape and folded inward so that fold lines thereof correspond to each other and connecting side edges of the flat portions. In the bag,
At the bottom of the gusset bag, a folding auxiliary portion is formed on the outer edge side of the storage portion where the contents are stored, by bending the bottom of the gusset bag to easily form a flat surface,
The gusset bag, wherein the folding assisting portion is a rough surface portion formed of an aggregate of a plurality of fine holes formed on at least one of the flat surface portion and the side surface portion.

A gusset having a pair of opposed flat portions and a pair of side portions formed in a fold shape and folded inward so that fold lines thereof correspond to each other and connecting side edges of the flat portions. In the bag,
At the bottom of the gusset bag, a folding auxiliary portion is formed on the outer edge side of the storage portion where the contents are stored, by bending the bottom of the gusset bag to easily form a flat surface,
The folding assisting section is provided with a linear cut extending in the width direction of the gusset bag and a crack propagation preventing portion formed at both ends of the linear cut in at least one of the flat portion or the side portion. A gusset bag characterized by:

The gusset bag according to claim 4, wherein the crack propagation preventing portion is an arc-shaped notch that is continuous with the linear notch.

The folding assisting part is formed on at least one of a plane part or a side part located on one side with respect to a thickness direction of the gusset bag with respect to a folding line formed on the side part. The gusset bag according to any one of claims 1 to 4.

The folding assisting portion is formed at one of the flat portion and a portion of the side portion closer to the other flat portion than a folding line formed at the center of the side portion. The gusset bag according to claim 4.

At the position where the folding assisting portion is formed, a surface on the side located inside the folding when the bottom portion is folded, a fold formed in a concave shape is formed by being overlapped with the folding assisting portion. The gusset bag according to any one of claims 1 to 4, wherein the gusset bag is provided.

The recess is formed by forming a through hole in the side surface portion and bonding the flat surface portion to the side surface portion,
The gusset bag according to claim 2, wherein the through hole formed in the side surface portion is concealed by the flat surface portion.

It has a pair of opposing flat portions and a pair of side portions formed in a fold shape and folded inward so that the fold lines correspond to each other,
The inner surfaces of the four ridges formed by the flat surface and the side surfaces are heat-sealed to form a cylinder, and the upper and lower edges of the cylinder are heat-sealed and heat-sealed. A gusset bag in which a triangular-shaped seal portion is formed by heat-sealing the inner surfaces of the flat surface portion and the side surface portions so as to connect the lower edge and the heat-fused ridge line,
Among these triangular shaped seal portions, at least one of the flat portion and the side portion is heat-sealed, and a folding auxiliary portion is formed to easily form a flat surface by bending the bottom of the gusset bag. ,
The folding assisting portion is at least one perforation, and the perforation is formed at a position where a folding line at which the bottom of the gusset bag is bent is formed, and at both ends of the straight portion. A gusset bag, comprising:

It has a pair of opposing flat portions and a pair of side portions formed in a fold shape and folded inward so that the fold lines correspond to each other,
The inner surface of the four ridge lines formed by the flat portion and the side portion is heat-sealed with each other to form a cylinder, and the upper edge and the lower edge of the cylinder are heat-sealed, and the heat-sealed lower edge is formed. In a gusset bag in which a triangular-shaped seal portion is formed by heat-sealing the inner surfaces of the flat surface portion and the side surface portions to connect the heat-sealed ridge line,
Of these triangular shaped seal portions, at least one of the flat portion and the side portion is heat-sealed, and a folding auxiliary portion is formed to easily form a flat surface by bending the bottom of the gusset bag,
The folding assisting portion is a through hole formed in the side surface portion, and a major axis direction of the through hole is formed so as to coincide with a direction in which a folding line at which the bottom of the gusset bag is bent extends.
A gusset bag, wherein the folding assisting portion is hidden by the flat portion.