JP4373102B2

JP4373102B2 - Gusset type packaging bag

Info

Publication number: JP4373102B2
Application number: JP2003026784A
Authority: JP
Inventors: 年朗谷; 智子西嶋; 行倫金村
Original assignee: Dai Nippon Printing Co Ltd
Current assignee: Dai Nippon Printing Co Ltd
Priority date: 2003-02-04
Filing date: 2003-02-04
Publication date: 2009-11-25
Anticipated expiration: 2023-02-04
Also published as: JP2004237995A

Description

【０００１】
【発明の属する技術分野】
本発明は、開封が容易なガセットタイプ包装袋に関するものである。
【０００２】
【従来の技術】
従来から、内容物の収容容積〔包装内容積（ｃｍ³）／包装材面積（ｃｍ²）比〕が大きく、内容物の単位収容量当たりの包装材コストが安価であり、また、立てた状態で陳列することができるためにスペース的にも有利であり商品見栄えが良いなどの理由から収容量の多い内容物に好適な袋としてガセットタイプ包装袋が用いられている。
【０００３】
しかし、ガセットタイプ包装袋は、両側部に横断面Ｖ字状の折込部があり、この折込部を外した折込部と直交する端縁にＶ字状やＩ字状の切欠や切込を設け、これを開封開始手段として袋を開封するように構成されている。この開封開始手段により袋を開封すると、縦方向（折込部に平行な方向）に不規則な形状に開口するために、粉体や顆粒状等の内容物の場合には、開封時に内容物が零れて周囲に飛散するといった問題や使用後に残った内容物を保管する際には、開封した開口を塞ぐことが結構煩雑であるといった問題があった。
【０００４】
そこで、上記問題を解決するガセットタイプ包装袋が提案されている（たとえば、特許文献１参照）。特許文献１記載の考案は、ガセットタイプ包装袋を横方向（折込部に直交する方向）に開封する工夫が盛込まれた提案であって、袋体の横方向側部に側シール部を設けると共に該側シール部に開口シール部の内側を横方向に引き裂き得るノッチを設け、ノッチの反対側に位置する折り込み部にノッチから延びる引き裂き予定線上における折り込み内部先端角部と表裏面とをスポット状のヒートシール部で溶着して一体化した構成からなるガセットタイプ包装袋であって、このように構成することによりガセットタイプ包装袋を横方向（折込部に直交する方向）にほぼ一定の形状に開口することができて粉体や顆粒状等の内容物の場合においても開封時に内容物が零れる虞がなく、使用後に残った内容物を保管する際にも開封した開口を容易に塞ぐことができるというものである。
【０００５】
しかしながら、本発明者が実際に特許文献１記載の考案に基づいて袋を試作して引き裂き開封を試みたところ、折り込み内部先端角部までは容易に引き裂くことができるが、引き裂きが進み引き裂き先端がスポット状のヒートシール部の折り込み内部先端角部に至ると折り込み内部先端角部が引き裂き時に大きな抗引き裂き部となり、スムーズに引き裂くことができなかった。
【０００６】
【特許文献１】
実開平５−２６８３８号公報
【０００７】
【発明が解決しようとする課題】
そこで本発明は、折込部に直交する方向に容易に開封することができて、ほぼ一定の形状の開口を得ることができるガセットタイプ包装袋を提供することである。
【０００８】
【課題を解決するための手段】
本発明者は、上記課題を達成するために、請求項１記載の本発明は、少なくとも内層が熱接着性樹脂層からなる矩形状積層体の対向する端縁を前記内層同士が当接するように重ね合わせて熱接着して合掌シール部を有する筒状体となし、該筒状体の対向する両側部に横断面Ｖ字状の折込部を設け、その一方の折込部の一方の側端縁に前記合掌シール部が位置するように構成し、前記筒状体の上下端縁部を上下端縁熱接着部で熱接着して密封したガセットタイプ包装袋において、前記合掌シール部と前記側端縁熱接着部の対向する位置に開封開始手段を形成し、該開封開始手段により包装袋を引裂いた際の引裂き仮想線上にある他方の前記折込部の折込先端部を含むように前記折込先端部を跨いで前記内層同士を熱接着した開封補助熱接着部を設けると共に前記開封補助熱接着部内の他方の前記折込部の折込先端部を少なくとも切断する開封補助手段を設けており、前記開封補助熱接着部は前記上端縁熱接着部に連接して設けられており、前記開封補助手段は前記開封補助熱接着部の周端には達しない包装袋を貫通する切込から構成されていることを特徴とするものである。
【０００９】
また、請求項２記載の本発明は、少なくとも内層が熱接着性樹脂層からなる矩形状積層体の対向する端縁を前記内層同士が当接するように重ね合わせて熱接着して合掌シール部を有する筒状体となし、前記合掌シール部が背シール部を構成するように前記筒状体の対向する両側部に横断面Ｖ字状の折込部を形成して前記筒状体の上下端縁部を上下端縁熱接着部で熱接着して密封したガセットタイプ包装袋において、一方の前記折込部の２つの側端縁部の対向する位置に側端縁熱接着部を設けると共に該側端縁熱接着部の対向する位置に開封開始手段を形成し、該開封開始手段により包装袋を引裂いた際の引裂き仮想線上にある前記合掌シール部の根元部に合掌シール部開封補助手段を設け、さらに前記引裂き仮想線上にある他方の前記折込部の折込先端部を含むように前記折込先端部を跨いで前記内層同士を熱接着した開封補助熱接着部を設けると共に前記開封補助熱接着部内の他方の前記折込部の折込先端部を少なくとも切断する開封補助手段を設けており、前記開封補助熱接着部は前記上端縁熱接着部に連接して設けられており、前記開封補助手段は前記開封補助熱接着部の周端には達しない包装袋を貫通する切込から構成されていることを特徴とするものである。
【００１０】
また、請求項３記載の本発明は、少なくとも内層が熱接着性樹脂層からなる矩形状積層体の対向する端縁を前記内層同士が当接するように重ね合わせて熱接着して合掌シール部を有する筒状体となし、前記合掌シール部が背シール部を構成するように前記筒状体の対向する両側部に横断面Ｖ字状の折込部を形成すると共に前記合掌シール部の根元部を一方の前記折込部の折込先端部とほぼ合致する位置となるように構成し、前記筒状体の上下端縁部を上下端縁熱接着部で熱接着して密封したガセットタイプ包装袋において、他方の前記折込部の２つの側端縁部の対向する位置に側端縁熱接着部を設けると共に該側端縁熱接着部の対向する位置に開封開始手段を形成し、該開封開始手段により包装袋を引裂いた際の引裂き仮想線上にある前記一方の折込部の折込先端部および前記合掌シール部の前記根元部を含むように前記折込先端部および前記合掌シール部の前記根元部を跨いで前記内層同士を熱接着した開封補助熱接着部を設けると共に前記開封補助熱接着部内の前記一方の折込部の折込先端部および前記合掌シール部の前記根元部を少なくとも切断する開封補助手段を設けており、前記開封補助熱接着部は前記上端縁熱接着部に連接して設けられており、前記開封補助手段は前記開封補助熱接着部の周端には達しない包装袋を貫通する切込から構成されていることを特徴とするものである。
【００１１】
請求項１〜３のいずれかに記載の構成とすることにより、折込部に直交する方向に容易に開封することができて、ほぼ一定の形状の開口を得ることができる。
【００１２】
【発明の実施の形態】
上記の本発明について、図面等を用いて以下に詳しく説明する。
図１は本発明にかかるガセットタイプ包装袋の第１実施形態を示す要部斜視図、図２（ａ）は図１のガセットタイプ包装袋を開封した開口面を図解的に示す平面図、図２（ｂ）は図２（ａ）の開口面の開封補助熱接着部を剥離した状態の開口面を図解的に示す平面図、図３は本発明にかかるガセットタイプ包装袋の第２実施形態を示す要部斜視図、図４は図３のガセットタイプ包装袋に設けるハーフカットの設け方を説明する図、図５は本発明にかかるガセットタイプ包装袋の第３実施形態を示す要部斜視図であり、図中の１，１’，１”はガセットタイプ包装袋、２はＩノッチ、３は開封補助熱接着部、４は直線状切込、５はハーフカット、１０は合掌シール部、１１、１２、１３は側端縁熱接着部、２０は上端縁熱接着部、３０は合掌シール部の根元部、Ａ，Ｂは折込部、Ｂ１は折込先端部、αは引裂き仮想線をそれぞれ示す。
【００１３】
図１は本発明にかかるガセットタイプ包装袋の第１実施形態を示す要部斜視図であって、ガセットタイプ包装袋１は、少なくとも外層と熱接着性樹脂層の内層とからなる矩形状積層体の対向する端縁を前記内層同士が当接するように重ね合わせて熱接着して合掌シール部１０を有する筒状体となし、該筒状体の対向する両側部に横断面Ｖ字状の折込部Ａ、Ｂを設け、前記折込部Ａの一方の側端縁に前記合掌シール部１０が位置するように構成して前記筒状体の上下端縁部を上端縁熱接着部２０および下端縁熱接着部（図示せず）で熱接着して密封すると共に、前記合掌シール部１０を形成した前記折込部Ａの他方の側端縁に前記上端縁熱接着部２０に連接して側端縁熱接着部１１を形成し、さらに前記合掌シール部１０と前記側端縁熱接着部１１の対向する位置に開封開始手段としてのＩノッチ２、２を形成し、該Ｉノッチ２、２により包装袋を引裂いた際の引裂き仮想線α上にある前記折込部Ｂの折込先端部Ｂ１を含むように前記折込先端部Ｂ１を跨いで前記内層同士を熱接着した開封補助熱接着部３を前記上端縁熱接着部２０に連接して設けると共に前記開封補助熱接着部３内に前記折込先端部Ｂ１を少なくとも切断する開封補助手段としての一本の直線状切込４を引裂き仮想線αとほぼ一致するように包装袋を貫通して設けたものである。
【００１４】
このように構成したガセットタイプ包装袋１は、密封性に優れると共に開封する際には前記折込部Ａの前記合掌シール部１０と前記側端縁熱接着部１１とに設けた両Ｉノッチ２を開封開始手段として引裂くことにより引裂き仮想線αに沿って引裂かれ、引裂き線が前記折込先端部Ｂ１近傍に達すると前記折込部Ｂの前記折込先端部Ｂ１を含むように前記折込先端部Ｂ１を跨いで前記内層同士を熱接着した開封補助熱接着部３と、この開封補助熱接着部３内に設けた前記折込先端部Ｂ１を少なくとも切断する直線状切込４との協働により前記折込先端部Ｂ１も抵抗なく引裂くことができ、図２（ａ）に示すようなほぼ一定の形状の開口を得ることができる。さらに図２（ａ）の符号３で示す開封補助熱接着部を手指で剥離することにより図２（ｂ）に示すような大きな開口を得ることができる。
【００１５】
図３は本発明にかかるガセットタイプ包装袋の第２実施形態を示す一部切欠要部斜視図であって、ガセットタイプ包装袋１’は、少なくとも外層と熱接着性樹脂層の内層とからなる矩形状積層体の対向する端縁を前記内層同士が当接するように重ね合わせて熱接着して合掌シール部１０を有する筒状体となし、前記合掌シール部１０が背シール部を構成するように前記筒状体の対向する両側部に横断面Ｖ字状の折込部Ａ、Ｂを形成して前記筒状体の上下端縁部を上端縁熱接着部２０および下端縁熱接着部（図示せず）で熱接着して密封すると共に、前記折込部Ａの２つの側端縁部の対向する位置に前記上端縁熱接着部２０に連接して側端縁熱接着部１２、１３を設けると共に該側端縁熱接着部１２、１３の対向する位置に開封開始手段としてのＩノッチ２、２を形成し、該Ｉノッチ２、２により包装袋を引裂いた際の引裂き仮想線α上にある前記合掌シール部１０の根元部３０に該根元部３０から根元部３０の両側に前記積層体の前記内層から前記外層にその一部が達する合掌シール部開封補助手段としての一条のハーフカット５を設け、さらに前記引裂き仮想線α上にある前記折込部Ｂの折込先端部Ｂ１を含むように前記折込先端部Ｂ１を跨いで前記内層同士を熱接着した開封補助熱接着部３を設けると共に前記開封補助熱接着部３内の前記折込部Ｂの折込先端部Ｂ１を少なくとも切断する開封補助手段としての一本の直線状切込４を引裂き仮想線αとほぼ一致するように包装袋を貫通して設けたものである。また、前記合掌シール部１０の前記開封補助熱接着部３を設けた前記折込部Ｂ側に位置する前記根元部３０のみに前記合掌シール部開封補助手段を設けてもよいものである。なお、前記ハーフカット５の設け方としては、図４に示すようにガセットタイプ包装袋１’とした際の引裂き仮想線α上に位置する前記合掌シール部１０の前記根元部３０となる前記積層体の箇所に予め前記積層体の前記内層から前記外層にその一部が達するように形成されるものである。しかしながら、内層が引裂き易い樹脂の場合には、前記合掌シール部開封補助手段として、前記合掌シール部１０の前記根元部３０となる前記積層体の箇所に前記積層体の前記外層から前記内層にその一部が達するように設けたものであってもよいものである。
【００１６】
このように構成したガセットタイプ包装袋１’は、密封性に優れると共に開封する際には前記折込部Ａの前記側端縁熱接着部１２、１３に設けた両Ｉノッチ２を開封開始手段として引裂くことにより引裂き仮想線αに沿って引裂かれ、引裂き線が前記合掌シール部１０の根元部３０近傍に達すると前記合掌シール部１０の前記根元部３０の両側に設けた前記ハーフカット５により前記合掌シール部１０の前記根元部３０を抵抗なく引裂くことができ、さらに引裂き線が前記折込先端部Ｂ１近傍に達すると前記折込部Ｂの前記折込先端部Ｂ１を含むように前記折込先端部Ｂ１を跨いで前記内層同士を熱接着した開封補助熱接着部３と、この開封補助熱接着部３内に設けた前記折込先端部Ｂ１を少なくとも切断する直線状切込４との協働により前記折込先端部Ｂ１も抵抗なく引裂くことができ、第１実施形態の図２（ａ）、（ｂ）に示したものと同じようなほぼ一定の形状の開口を得ることができる。
【００１７】
図５は本発明にかかるガセットタイプ包装袋の第３実施形態を示す要部斜視図であって、ガセットタイプ包装袋１”は、少なくとも外層と熱接着性樹脂層の内層とからなる矩形状積層体の対向する端縁を前記内層同士が当接するように重ね合わせて熱接着して合掌シール部１０を有する筒状体となし、前記合掌シール部１０が背シール部を構成するように前記筒状体の対向する両側部に横断面Ｖ字状の折込部Ａ、Ｂを形成すると共に前記合掌シール部１０の根元部３０を前記折込部Ｂの折込先端部Ｂ１とほぼ合致する位置となるように構成し、前記筒状体の上下端縁部を上端縁熱接着部２０および下端縁熱接着部（図示せず）で熱接着して密封すると共に、前記折込部Ａの２つの側端縁部の対向する位置に前記上端縁熱接着部２０に連接して側端縁熱接着部１２、１３を設けると共に該側端縁熱接着部１２、１３の対向する位置に開封開始手段としてのＩノッチ２、２を形成し、該Ｉノッチ２、２により包装袋を引裂いた際の引裂き仮想線α上にある前記折込部Ｂの折込先端部Ｂ１および前記合掌シール部１０の前記根元部３０を含むように前記折込先端部Ｂ１および前記合掌シール部１０の前記根元部３０を跨いで前記内層同士を熱接着した開封補助熱接着部３を設けると共に前記開封補助熱接着部３内の前記折込部Ｂの折込先端部Ｂ１および前記合掌シール部１０の前記根元部３０を少なくとも切断する開封補助手段としての一本の直線状切込４を引裂き仮想線αとほぼ一致するように包装袋を貫通して設けたものである。
【００１８】
このように構成したガセットタイプ包装袋１”は、密封性に優れると共に開封する際には前記折込部Ａの前記側端縁熱接着部１２、１３に設けた両Ｉノッチ２を開封開始手段として引裂くことにより引裂き仮想線αに沿って引裂かれ、引裂き線が前記折込先端部Ｂ１近傍に達すると前記折込部Ｂの前記折込先端部Ｂ１および前記合掌シール部１０の根元部３０を含むように前記折込先端部Ｂ１および前記根元部３０を跨いで前記内層同士を熱接着した開封補助熱接着部３と、この開封補助熱接着部３内に設けた前記折込先端部Ｂ１および前記根元部３０を少なくとも切断する直線状切込４との協働により前記折込先端部Ｂ１および前記根元部３０も抵抗なく引裂くことができ、第１実施形態の図２（ａ）、（ｂ）に示したものと同じようなほぼ一定の形状の開口を得ることができる。
【００１９】
なお、図１において前記側端縁熱接着部１１を前記上端縁熱接着部２０に連接して前記下端縁熱接着部（図示せず）側へ一定長さ延ばした構成としたが、前記合掌シール部１０と同様に前記上端縁熱接着部２０から前記下端縁熱接着部（図示せず）に至る長さとしてもよいものであるし、図３、５においても同様に前記側端縁熱接着部１２、１３を前記上端縁熱接着部２０から前記下端縁熱接着部（図示せず）に至る長さとしてもよいものである。また、図１、３、５においては前記折込部Ｂの２つの側端縁部を折部で構成したが、図示はしないが前記上端縁熱接着部２０から前記下端縁熱接着部（図示せず）に至る一定幅の側端縁熱接着部で構成してもよいものである。また、図示はしないが図１、３、５において前記折込部ＡおよびＢの４つの側端縁部を前記上端縁熱接着部２０から前記下端縁熱接着部（図示せず）に至る一定幅の４つの側端縁熱接着部で形成したガセットタイプ包装袋とすることにより、自立性に優れた見栄えのよい包装袋とすることができる。また、図１、３、５においては、前記開封補助熱接着部３を前記上端縁熱接着部２０に連接して設けたが、前記上端縁熱接着部２０に連接することなく島状に設けてもよいものである。
【００２０】
また、実施例においては開封開始手段をＩノッチで説明したが、Ｖ字状やＵ字状等の切欠であってもよいものであるし、また、合掌シール部開封補助手段を一条のハーフカット５で例示したが、複数条の平行なハーフカットであってもよいし、ハーフカット５の前記合掌シール１０の根元部３０より開封開始手段側をＶ字状に構成したＹ字形状の１ないし複数のハーフカットであってもよいものであるし、傷痕群からなるハーフカットであってもよいものである。また、開封補助熱接着部３内に設ける直線状切込４についても一本に限ることはなく、複数本の平行な直線状切込であってもよいし、折込部Ｂの折込先端部Ｂ１よりも開封開始手段側をＶ字状に構成したＹ字形状の１ないし複数の切込であってもよいものである。また、前記開封補助手段としての切込は、開封補助熱接着部３内の前記折込先端部Ｂ１を少なくとも切断するものであればよいものであって、包装袋１、１’、１”を貫通して設ける他に、包装袋１、１’、１”の表・裏面を形成する積層体の一方および前記折込先端部Ｂ１を貫通し、包装袋１、１’、１”の表・裏面を形成する積層体の他方の一部に達するハーフカットであってもよく、また、包装袋１、１’、１”とする前の積層体の状態で前記折込先端部Ｂ１となる位置に切込を予め設け、製袋時に開封補助熱接着部３を設けてもよいものである。
【００２１】
次に、本発明のガセットタイプ包装袋１、１’、１”に用いる積層体について説明する。外層としては、たとえば、ポリプロピレン、ポリエステル、ポリアミド等の延伸したフィルムないしこれらの少なくとも一方の面にアルミニウムや酸化珪素や酸化アルミニウム、ポリ塩化ビニリデン等の水蒸気や酸素ガスバリアー層を設けたものが適当である。内層としては、熱接着性樹脂であれば特に限定するものでなく、たとえば、ポリエチレン、ポリプロピレン等の周知の熱接着性樹脂を用いることができ、Ｔダイ押出機を用いて積層するサンドイッチラミネ−ションや接着剤を用いて積層するドライラミネ−ション等の積層方法を採る場合にあってはシート化したものであってもよいし、アルミニウム等を蒸着した蒸着シートであってもよいものである。
【００２２】
また、積層体としては、ガセットタイプ包装袋１、１’、１”としたときの要求物性により、外層と内層との間に必要に応じて、機械的強靭性、耐屈曲性、耐突き刺し性、耐衝撃性、耐寒性、耐熱性、耐薬品性、バリアー性等の機能を付与ないし向上させる目的で、たとえば、ポリエステル系、ポリアミド系、ポリプロピレン系等の樹脂からなる延伸した延伸フィルムや未延伸フィルムないしこれらの少なくとも一方の面にアルミニウムや酸化珪素や酸化アルミニウム、ポリ塩化ビニリデン等の水蒸気や酸素ガスバリアー層を設けたもの、あるいは、アルミニウム箔やエチレン−酢酸ビニル共重合体ケン化物などからなるものを中間層として使用することができる。また、外層ないし中間層のいずれかにガセットタイプ包装袋とした際の引裂き方向に対して良好な引裂き性を有する延伸フィルムを用いると引裂き開封性を向上させることができるために一層好適である。
【００２３】
【発明の効果】
以上縷々説明したように、本発明は、折込部に直交する方向に容易に開封することができて、ほぼ一定の形状の開口を得ることができるという今までにない優れた開封機構を有するガセットタイプ包装袋を提供することができる。
【図面の簡単な説明】
【図１】本発明にかかるガセットタイプ包装袋の第１実施形態を示す要部斜視図である。
【図２】（ａ）は図１のガセットタイプ包装袋を開封した開口面を図解的に示す平面図、（ｂ）は（ａ）の開口面の開封補助熱接着部を剥離した状態の開口面を図解的に示す平面図である。
【図３】本発明にかかるガセットタイプ包装袋の第２実施形態を示す要部斜視図である。
【図４】図３のガセットタイプ包装袋に設けるハーフカットの設け方を説明する図である。
【図５】本発明にかかるガセットタイプ包装袋の第３実施形態を示す要部斜視図である。
【符号の説明】
１，１’，１” ガセットタイプ包装袋
２Ｉノッチ
３開封補助熱接着部
４直線状切込
５ハーフカット
１０合掌シール部
１１、１２、１３側端縁熱接着部
２０上端縁熱接着部
３０合掌シール部の根元部
Ａ，Ｂ折込部
Ｂ１折込先端部
α 引裂き仮想線[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gusset type packaging bag that can be easily opened.
[0002]
[Prior art]
Conventionally, the content storage volume [packaging internal volume (cm ³ ) / packaging material area (cm ² ) ratio] is large, the packaging material cost per unit content of the content is low, and the upright state The gusset-type packaging bag is used as a bag suitable for a large amount of contents because it is advantageous in terms of space since it can be displayed on the market and the product looks good.
[0003]
However, gusset-type packaging bags have folds with a V-shaped cross section on both sides, and V-shaped and I-shaped cuts and cuts are provided at the edges perpendicular to the fold-off part from which this fold-up part is removed. The bag is opened using this as an opening start means. When the bag is opened by this opening start means, it opens in an irregular shape in the longitudinal direction (direction parallel to the folding part). In the case of contents such as powder or granules, the contents are not There are problems such as spilling and scattering to the surroundings, and when storing contents remaining after use, there is a problem that it is quite complicated to close the opened opening.
[0004]
Then, the gusset type packaging bag which solves the said problem is proposed (for example, refer patent document 1). The idea described in Patent Document 1 is a proposal in which a device for opening a gusset-type packaging bag in a lateral direction (a direction perpendicular to the folding portion) is incorporated, and a side seal portion is provided on a lateral side portion of the bag body. In addition, the side seal portion is provided with a notch capable of tearing the inside of the opening seal portion in the lateral direction, and the folded inner tip corner portion and the front and back surfaces on the planned tear line extending from the notch are spot-like at the folding portion located on the opposite side of the notch It is a gusset type packaging bag having a structure integrated by welding at the heat seal portion of the gusset, and the gusset type packaging bag is formed in this way so that the gusset type packaging bag has a substantially constant shape in the lateral direction (direction perpendicular to the folding portion). Even in the case of contents such as powders and granules that can be opened, there is no risk of the contents spilling at the time of opening, and the opened opening can be easily stored when storing the contents remaining after use Gukoto is that it is.
[0005]
However, when the inventor actually made a bag based on the idea described in Patent Document 1 and attempted to open the tear, it was possible to easily tear up to the corner of the inner end of the fold. When the spot-shaped heat seal part reached the folded inner tip corner, the folded inner tip corner became a large anti-tear part during tearing, and could not be torn smoothly.
[0006]
[Patent Document 1]
Japanese Utility Model Publication No. 5-26838 [0007]
[Problems to be solved by the invention]
Then, this invention is providing the gusset type packaging bag which can be opened easily in the direction orthogonal to a folding part, and can obtain the opening of a substantially fixed shape.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the inventor of the present invention according to claim 1 is configured so that the inner layers are in contact with each other at opposite edges of a rectangular laminate in which at least the inner layer is made of a heat-adhesive resin layer. A cylindrical body having a palm seal part that is overlapped and thermally bonded is provided, and a fold part having a V-shaped cross section is provided on both opposite sides of the cylindrical body, and one side edge of the one fold part In the gusset-type packaging bag, the upper and lower end edges of the cylindrical body are thermally bonded by the upper and lower end edge heat bonding parts and sealed, the gas separation seal part and the side end Forming the opening start means at a position opposite to the edge thermal bonding section, and including the folding front end portion of the other folding portion on the virtual tear line when the packaging bag is torn by the opening start means An unsealing auxiliary heat-bonding part that heat-bonds the inner layers across Kicking and provided unsealing auxiliary means for at least cutting the folded tip of the other of said folded portion in said opening auxiliary heat bonding portion together with the opening auxiliary heat bonded portion is provided connected to the upper edge heat-bonding portion And the said opening assistance means is comprised from the notch which penetrates the packaging bag which does not reach the peripheral end of the said opening assistance heat bonding part .
[0009]
Further, in the present invention according to claim 2, at least the inner layer is made of a heat-adhesive resin layer and the opposing edges of the rectangular laminate are overlapped so that the inner layers are in contact with each other, and are thermally bonded to form a joint seal portion. A cylindrical body having a bent portion having a V-shaped cross section on opposite sides of the cylindrical body so that the palm seal portion constitutes a back seal portion; In the gusset-type packaging bag in which the upper and lower edges are thermally bonded and sealed, a side edge thermal bonding portion is provided at a position opposite to the two side edge edges of one of the folded portions and the side edge Forming an opening start means at a position opposite to the edge thermal bonding portion, and providing a sealing seal portion opening assisting means at the root portion of the joint seal portion on the tearing virtual line when the packaging bag is torn by the opening start means; Furthermore, the other folding part on the tearing imaginary line An unsealing auxiliary thermal bonding part in which the inner layers are thermally bonded across the folding leading edge so as to include a folding leading edge is provided, and at least the folding leading edge of the other folding part in the unsealing auxiliary thermal bonding part is opened. Auxiliary opening means is provided , and the opening auxiliary thermal bonding portion is connected to the upper edge thermal bonding portion, and the opening auxiliary means is provided with a packaging bag that does not reach the peripheral edge of the opening auxiliary thermal bonding portion. It is comprised from the notch which penetrates .
[0010]
Further, in the present invention according to claim 3, at least the inner layer is made of a heat-adhesive resin layer, and the opposite edges of the rectangular laminate are overlapped so that the inner layers are in contact with each other and thermally bonded to form a joint seal portion. And forming a folded portion with a V-shaped cross section on both opposing sides of the cylindrical body so that the palm seal portion constitutes a back seal portion, and a base portion of the palm seal portion. In the gusset type packaging bag, which is configured to be a position that substantially coincides with the folding front end portion of one of the folding portions, and the upper and lower edge edges of the cylindrical body are thermally bonded and sealed at the upper and lower edge thermal bonding portions, A side edge thermal bonding portion is provided at a position where the two side edge portions of the other folding portion are opposed to each other, and an opening start means is formed at a position where the side edge thermal bonding portion is opposed. The one on the tearing imaginary line when the packaging bag is torn An opening assisting heat bonding portion is provided in which the inner layers are thermally bonded to each other across the folding tip portion and the root portion of the palm seal portion so as to include the folding tip portion of the folding portion and the root portion of the palm seal portion. And an opening assisting means for cutting at least the folding tip of the one folding part and the root part of the palm seal part in the opening assisting thermal adhesive part, the opening assisting thermal adhesive part being the upper edge thermal adhesive The opening assisting means is constituted by a notch penetrating through the packaging bag that does not reach the peripheral end of the opening assisting thermal bonding portion.
[0011]
By setting it as the structure in any one of Claims 1-3, it can open easily in the direction orthogonal to a folding part, and the opening of substantially constant shape can be obtained.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described in detail below with reference to the drawings.
FIG. 1 is a perspective view of an essential part showing a first embodiment of a gusset type packaging bag according to the present invention, FIG. 2 (a) is a plan view schematically showing an opening surface of the gusset type packaging bag of FIG. 2 (b) is a plan view schematically showing the opening surface of the opening surface of FIG. 2 (a) with the opening assisting heat-bonding part peeled off, and FIG. 3 is a second embodiment of the gusset type packaging bag according to the present invention. FIG. 4 is a diagram for explaining how to provide a half cut provided in the gusset type packaging bag of FIG. 3, and FIG. 5 is a perspective view of the principal portion showing a third embodiment of the gusset type packaging bag according to the present invention. In the figure, 1, 1 ', 1 "are gusset-type packaging bags, 2 is an I notch, 3 is an opening assisting thermal bonding part, 4 is a straight cut, 5 is a half cut, 10 is a palm seal part , 11, 12, and 13 are side edge thermal bonding portions, 20 is an upper edge thermal bonding portion, and 30 is a palm sea sheet. , A and B are folding portions, B1 is a folding tip portion, and α is a tearing imaginary line.
[0013]
FIG. 1 is a perspective view of a main part showing a first embodiment of a gusset type packaging bag according to the present invention, and the gusset type packaging bag 1 is a rectangular laminate comprising at least an outer layer and an inner layer of a heat-adhesive resin layer. The opposite end edges of the cylindrical body are overlapped and thermally bonded so that the inner layers are in contact with each other to form a cylindrical body having a palm seal portion 10. Parts A and B are provided so that the palm seal part 10 is positioned on one side edge of the folding part A, and the upper and lower edges of the cylindrical body are connected to the upper edge thermal bonding part 20 and the lower edge. A thermal bonding portion (not shown) is thermally bonded and sealed, and is connected to the upper edge thermal bonding portion 20 on the other side edge of the folding portion A where the palm seal portion 10 is formed. Forming a heat-bonding portion 11, and further, the palm seal portion 10 and the side edge heat-bonding portion 1 I notches 2 and 2 as opening start means are formed at positions 1 opposite to each other, and the leading end B1 of the folding portion B on the tearing imaginary line α when the packaging bag is torn by the I notches 2 and 2 The opening assisting heat-bonding part 3 is formed by connecting the inner layers to the upper end edge heat-bonding part 20 and straddling the folding leading end B1 so as to include One straight cut 4 serving as an opening assisting means for cutting at least the tip B1 is provided through the packaging bag so as to substantially coincide with the tearing imaginary line α.
[0014]
The gusset-type packaging bag 1 configured in this manner has excellent sealing properties and has two I notches 2 provided in the palm seal portion 10 and the side edge thermal bonding portion 11 of the folding portion A when opened. By tearing as tear opening start means, tearing is performed along the virtual tear line α, and when the tear line reaches the vicinity of the folding tip B1, the folding tip B1 is configured to include the folding tip B1 of the folding B. The tip of the fold is made by the cooperation of an opening assisting thermal adhesive portion 3 in which the inner layers are thermally bonded across the straddle and a linear notch 4 at least cutting the fold leading end B1 provided in the opening assisting thermal adhesive portion 3. The part B1 can also be torn without resistance, and an opening having a substantially constant shape as shown in FIG. 2A can be obtained. Furthermore, a large opening as shown in FIG. 2 (b) can be obtained by peeling the opening assisting thermal adhesive portion indicated by reference numeral 3 in FIG. 2 (a) with fingers.
[0015]
FIG. 3 is a partially cutaway perspective view showing a second embodiment of the gusset-type packaging bag according to the present invention, and the gusset-type packaging bag 1 ′ is composed of at least an outer layer and an inner layer of a heat-adhesive resin layer. The opposite edges of the rectangular laminate are overlapped so that the inner layers are in contact with each other and thermally bonded to form a cylindrical body having a palm seal portion 10, and the palm seal portion 10 constitutes a back seal portion. Folded portions A and B having a V-shaped cross section are formed on opposite side portions of the cylindrical body, and the upper and lower edge portions of the cylindrical body are connected to the upper edge thermal bonding portion 20 and the lower edge thermal bonding portion (see FIG. (Not shown) are thermally bonded and sealed, and are provided with side edge thermal bonding portions 12 and 13 connected to the upper edge thermal bonding portion 20 at positions opposite to the two side edge portions of the folding portion A. At the same time, the side edge thermal bonding portions 12 and 13 are opposed to each other as opening opening means. I notches 2 and 2 are formed, and both sides of the root portion 30 extend from the root portion 30 to the root portion 30 of the joint seal portion 10 on the tearing imaginary line α when the packaging bag is torn by the I notches 2 and 2. Provided with a single half-cut 5 as an opening-sealing part opening assisting means that partially reaches the outer layer from the inner layer to the outer layer, and a folding tip B1 of the folding part B on the tearing imaginary line α. An opening assisting thermal adhesive part 3 is provided that thermally bonds the inner layers across the folding tip part B1 so as to include at least a folding tip part B1 of the folding part B in the opening assisting thermal adhesive part 3 One straight cut 4 as an opening assisting means is provided through the packaging bag so as to substantially coincide with the tearing virtual line α. Further, only the root part 30 located on the folding part B side where the opening assisting heat bonding part 3 of the palm seal part 10 is provided may be provided with the palm seal part opening assisting means. In addition, as the method of providing the half-cut 5, as shown in FIG. 4, the laminated layer that becomes the root portion 30 of the joint seal portion 10 located on the tearing imaginary line α when the gusset-type packaging bag 1 ′ is formed. A part of the laminate is formed in advance so as to reach a part of the body from the inner layer to the outer layer. However, in the case where the inner layer is a resin that is easily torn, as the joint seal portion opening assisting means, from the outer layer of the laminate to the inner layer at the location of the root portion 30 of the joint seal portion 10 It may be provided so that a part of it reaches.
[0016]
The gusset-type packaging bag 1 ′ thus configured has excellent sealing performance, and when opened, both I notches 2 provided in the side edge thermal bonding portions 12 and 13 of the folding portion A are used as opening start means. When the tear line reaches near the root portion 30 of the joint seal portion 10 by tearing along the tear virtual line α, the half cuts 5 provided on both sides of the root portion 30 of the joint seal portion 10 The root portion 30 of the joint seal portion 10 can be torn without resistance, and when the tear line reaches the vicinity of the folding tip portion B1, the folding tip portion includes the folding tip portion B1 of the folding portion B. In cooperation with the opening assisting heat-bonding portion 3 that thermally bonds the inner layers across B1 and the linear notch 4 that cuts at least the folding tip portion B1 provided in the opening assisting heat-bonding portion 3 Write tip B1 can also be torn without resistance, FIG. 2 of the first embodiment (a), it is possible to obtain the opening of substantially constant shape like that shown in (b).
[0017]
FIG. 5 is a perspective view showing a main part of a third embodiment of a gusset type packaging bag according to the present invention, wherein the gusset type packaging bag 1 ″ is a rectangular laminated layer composed of at least an outer layer and an inner layer of a heat-adhesive resin layer. The opposite end of the body is overlapped so that the inner layers are in contact with each other and thermally bonded to form a tubular body having a palm seal portion 10, and the cylinder seal portion 10 forms a back seal portion. Folded portions A and B having a V-shaped cross section are formed on opposite sides of the body, and the root portion 30 of the joint seal portion 10 is substantially aligned with the folded tip B1 of the folded portion B. The upper and lower edges of the cylindrical body are thermally bonded and sealed with an upper edge thermal adhesive portion 20 and a lower edge thermal adhesive portion (not shown), and the two side edges of the folding portion A are sealed. Connected to the upper edge thermal bonding part 20 The edge thermal bonding portions 12 and 13 are provided, and I notches 2 and 2 are formed as opening starting means at positions opposite to the side edge thermal bonding portions 12 and 13, and the packaging bag is formed by the I notches 2 and 2. The folding tip B1 and the root portion of the palm seal portion 10 so as to include the folding tip B1 of the folding portion B and the root portion 30 of the palm seal portion 10 that are on the tearing imaginary line α when tearing. 30 is provided with an unsealing auxiliary thermal bonding portion 3 in which the inner layers are thermally bonded to each other, and the folding tip B1 of the folding portion B in the unsealing auxiliary thermal bonding portion 3 and the root portion 30 of the palm seal portion 10 are provided. At least one straight cut 4 as opening assisting means for cutting is provided through the packaging bag so as to substantially coincide with the tearing virtual line α.
[0018]
The gusset-type packaging bag 1 "configured in this way has excellent sealing performance and when opened, both I-notches 2 provided on the side edge thermal bonding portions 12, 13 of the folding portion A are used as opening start means. When the tear line reaches the vicinity of the folding tip B1, the folding tip B1 of the folding part B and the root part 30 of the joint seal part 10 are included so that the tear line reaches the vicinity of the folding tip B1. The opening assisting thermal adhesive part 3 in which the inner layers are thermally bonded across the folding tip part B1 and the root part 30, and the folding tip part B1 and the root part 30 provided in the opening assisting thermal adhesive part 3 The folding tip B1 and the root 30 can be torn without resistance by cooperating with at least the linear cut 4 to be cut, as shown in FIGS. 2A and 2B of the first embodiment. Similar to It can be obtained an opening of predetermined shape.
[0019]
In FIG. 1, the side edge thermal bonding portion 11 is connected to the upper edge thermal bonding portion 20 and extended to the lower edge thermal bonding portion (not shown) side by a certain length. Similarly to the seal portion 10, the length from the upper edge thermal adhesive portion 20 to the lower edge thermal adhesive portion (not shown) may be used. In FIGS. The adhesive portions 12 and 13 may have a length extending from the upper edge thermal adhesive portion 20 to the lower edge thermal adhesive portion (not shown). 1, 3, and 5, the two side edge portions of the folding portion B are formed by folding portions, but although not shown, the upper edge thermal bonding portion 20 to the lower edge thermal bonding portion (not shown). 2) may be constituted by a side edge thermal bonding portion having a certain width. Although not shown, in FIGS. 1, 3 and 5, the four side edge portions of the folding portions A and B are fixed in width from the upper edge thermal adhesive portion 20 to the lower edge thermal adhesive portion (not shown). By using the gusset-type packaging bag formed by the four side edge thermal bonding portions, it is possible to provide a packaging bag with excellent appearance and excellent self-supporting property. 1, 3, and 5, the opening assisting thermal bonding portion 3 is connected to the upper edge thermal bonding portion 20, but is provided in an island shape without being connected to the upper edge thermal bonding portion 20. It may be.
[0020]
Further, in the embodiment, the opening start means has been described with an I-notch, but it may be a V-shaped or U-shaped notch, and the joint seal portion opening assisting means is a single half-cut. 5 may be a plurality of parallel half-cuts, or a Y-shaped 1 or 2 having a V-shaped opening starting means side from the root portion 30 of the palm seal 10 of the half-cut 5. It may be a plurality of half cuts, or may be a half cut consisting of a group of scars. Moreover, the linear notch 4 provided in the opening assisting heat bonding part 3 is not limited to one, and may be a plurality of parallel straight notches, or a folding tip B1 of the folding part B. Alternatively, it may be one or more Y-shaped cuts in which the opening start means side is formed in a V shape. Further, the notch as the opening assisting means may be any one that cuts at least the folding front end B1 in the opening assisting thermal bonding portion 3 and penetrates the packaging bags 1, 1 ′, 1 ″. In addition, the front and back surfaces of the packaging bag 1, 1 ′, 1 ″ are penetrated through one of the laminates forming the front and back surfaces of the packaging bag 1, 1 ′, 1 ″ and the folding tip B1. It may be a half cut reaching the other part of the laminate to be formed, and is cut at a position where the folding tip B1 is formed in the state of the laminate before the packaging bag 1, 1 ′, 1 ″. May be provided in advance, and the opening assisting thermal bonding part 3 may be provided during bag making.
[0021]
Next, the laminate used for the gusset-type packaging bag 1, 1 ′, 1 ″ of the present invention will be described. As the outer layer, for example, a stretched film of polypropylene, polyester, polyamide or the like or aluminum on at least one surface thereof is used. It is appropriate to provide a water vapor or oxygen gas barrier layer such as silicon oxide, aluminum oxide, polyvinylidene chloride, etc. The inner layer is not particularly limited as long as it is a thermoadhesive resin. In the case where a laminating method such as sandwich lamination using a T-die extruder or dry lamination using an adhesive is employed, a sheet can be used. Or a vapor deposition sheet deposited with aluminum or the like It is.
[0022]
In addition, due to the required physical properties when the gusset-type packaging bag 1, 1 ', 1 "is used as the laminate, mechanical toughness, flex resistance, and puncture resistance are provided between the outer layer and the inner layer as required. For the purpose of imparting or improving functions such as impact resistance, cold resistance, heat resistance, chemical resistance, barrier properties, etc., for example, stretched stretched films made of resin such as polyester, polyamide, and polypropylene or unstretched A film or a film provided with a water vapor or oxygen gas barrier layer such as aluminum, silicon oxide, aluminum oxide or polyvinylidene chloride on at least one surface thereof, or an aluminum foil or a saponified ethylene-vinyl acetate copolymer. Can be used as an intermediate layer, and tear when a gusset type packaging bag is used for either the outer layer or the intermediate layer It is more preferable to use a stretched film having good tearability with respect to the direction because the tear opening property can be improved.
[0023]
【The invention's effect】
As described above frequently, the present invention is a gusset having an unprecedented excellent opening mechanism that can be easily opened in a direction orthogonal to the folding portion and an opening having a substantially constant shape can be obtained. Type packaging bags can be provided.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a main part of a first embodiment of a gusset type packaging bag according to the present invention.
2A is a plan view schematically showing an opening surface of the gusset-type packaging bag of FIG. 1, and FIG. 2B is an opening of the opening surface of FIG. It is a top view which shows a surface diagrammatically.
FIG. 3 is a perspective view of a main part showing a second embodiment of a gusset type packaging bag according to the present invention.
4 is a diagram for explaining how to provide a half cut provided in the gusset type packaging bag of FIG. 3; FIG.
FIG. 5 is a perspective view of a principal part showing a third embodiment of a gusset type packaging bag according to the present invention.
[Explanation of symbols]
1, 1 ', 1 "Gusset type packaging bag 2 I notch 3 Opening auxiliary heat bonding part 4 Straight cut 5 Half cut 10 Joint seal part 11, 12, 13 Side edge heat bonding part 20 Upper edge heat bonding part 30 Root part A, B of joint seal part Folding part B1 Folding tip part α Tear virtual line

Claims

少なくとも内層が熱接着性樹脂層からなる矩形状積層体の対向する端縁を前記内層同士が当接するように重ね合わせて熱接着して合掌シール部を有する筒状体となし、該筒状体の対向する両側部に横断面Ｖ字状の折込部を設け、その一方の折込部の一方の側端縁に前記合掌シール部が位置するように構成し、前記筒状体の上下端縁部を上下端縁熱接着部で熱接着して密封したガセットタイプ包装袋において、前記合掌シール部と前記側端縁熱接着部の対向する位置に開封開始手段を形成し、該開封開始手段により包装袋を引裂いた際の引裂き仮想線上にある他方の前記折込部の折込先端部を含むように前記折込先端部を跨いで前記内層同士を熱接着した開封補助熱接着部を設けると共に前記開封補助熱接着部内の他方の前記折込部の折込先端部を少なくとも切断する開封補助手段を設けており、前記開封補助熱接着部は前記上端縁熱接着部に連接して設けられており、前記開封補助手段は前記開封補助熱接着部の周端には達しない包装袋を貫通する切込から構成されていることを特徴とするガセットタイプ包装袋。A cylindrical body having a palm seal part is formed by overlapping and thermally bonding the opposing edges of a rectangular laminate having at least an inner layer made of a heat-adhesive resin layer so that the inner layers are in contact with each other. Are provided with folding parts having a V-shaped cross-section on both opposite sides, and the palm seal part is positioned on one side edge of the one folding part, and the upper and lower edges of the cylindrical body In the gusset-type packaging bag which is thermally bonded by the upper and lower edge thermal adhesive portions and sealed, the opening start means is formed at the position where the palm seal portion and the side edge thermal adhesive portion face each other, and packaging is performed by the opening start means. An opening assisting thermal adhesive portion is provided that thermally bonds the inner layers across the folding tip portion so as to include the folding tip portion of the other folding portion on the tearing imaginary line when the bag is torn, and the opening assist heat Folding tip of the other folding part in the bonding part The has established the opening aid means for at least cutting, the unsealing auxiliary heat bonding portion is provided connected to the upper edge heat-bonding portion, said opening aid on the peripheral edge of the opening auxiliary heat bonded joints A gusset-type packaging bag, characterized in that the gusset-type packaging bag consists of a notch that penetrates the packaging bag that does not reach .

少なくとも内層が熱接着性樹脂層からなる矩形状積層体の対向する端縁を前記内層同士が当接するように重ね合わせて熱接着して合掌シール部を有する筒状体となし、前記合掌シール部が背シール部を構成するように前記筒状体の対向する両側部に横断面Ｖ字状の折込部を形成して前記筒状体の上下端縁部を上下端縁熱接着部で熱接着して密封したガセットタイプ包装袋において、一方の前記折込部の２つの側端縁部の対向する位置に側端縁熱接着部を設けると共に該側端縁熱接着部の対向する位置に開封開始手段を形成し、該開封開始手段により包装袋を引裂いた際の引裂き仮想線上にある前記合掌シール部の根元部に合掌シール部開封補助手段を設け、さらに前記引裂き仮想線上にある他方の前記折込部の折込先端部を含むように前記折込先端部を跨いで前記内層同士を熱接着した開封補助熱接着部を設けると共に前記開封補助熱接着部内の他方の前記折込部の折込先端部を少なくとも切断する開封補助手段を設けており、前記開封補助熱接着部は前記上端縁熱接着部に連接して設けられており、前記開封補助手段は前記開封補助熱接着部の周端には達しない包装袋を貫通する切込から構成されていることを特徴とするガセットタイプ包装袋。At least the inner edges of the rectangular laminated body made of a heat-adhesive resin layer are stacked so that the inner layers are in contact with each other so that the inner layers are in contact with each other to form a tubular body having a palm seal portion, the palm seal portion Folded portions with a V-shaped cross section are formed on opposite side portions of the cylindrical body so as to constitute a back seal portion, and the upper and lower edge edges of the cylindrical body are thermally bonded at the upper and lower edge thermal bonding portions. In the sealed gusset-type packaging bag, a side edge thermal bonding portion is provided at a position opposite to the two side edge edges of one of the folded portions, and opening is started at a position opposite to the side edge thermal bonding section. Forming a sealing seal portion opening assisting means at the root portion of the tear seal line on the tearing virtual line when the packaging bag is torn by the opening start means, and further, the other folding on the tearing virtual line The folds to include the folding tip It said inner layer to each other across the tip and provided with opening aid means for at least cutting the folded tip of the other of said folded portion in said opening auxiliary heat bonding portion provided with an opening auxiliary heat bonded portion that is thermally bonded, the opening The auxiliary thermal bonding part is provided so as to be connected to the upper edge thermal bonding part, and the opening assisting means is formed by a notch penetrating the packaging bag that does not reach the peripheral end of the opening auxiliary thermal bonding part. Gusset type packaging bag characterized by that.

少なくとも内層が熱接着性樹脂層からなる矩形状積層体の対向する端縁を前記内層同士が当接するように重ね合わせて熱接着して合掌シール部を有する筒状体となし、前記合掌シール部が背シール部を構成するように前記筒状体の対向する両側部に横断面Ｖ字状の折込部を形成すると共に前記合掌シール部の根元部を一方の前記折込部の折込先端部とほぼ合致する位置となるように構成し、前記筒状体の上下端縁部を上下端縁熱接着部で熱接着して密封したガセットタイプ包装袋において、他方の前記折込部の２つの側端縁部の対向する位置に側端縁熱接着部を設けると共に該側端縁熱接着部の対向する位置に開封開始手段を形成し、該開封開始手段により包装袋を引裂いた際の引裂き仮想線上にある前記一方の折込部の折込先端部および前記合掌シール部の前記根元部を含むように前記折込先端部および前記合掌シール部の前記根元部を跨いで前記内層同士を熱接着した開封補助熱接着部を設けると共に前記開封補助熱接着部内の前記一方の折込部の折込先端部および前記合掌シール部の前記根元部を少なくとも切断する開封補助手段を設けており、前記開封補助熱接着部は前記上端縁熱接着部に連接して設けられており、前記開封補助手段は前記開封補助熱接着部の周端には達しない包装袋を貫通する切込から構成されていることを特徴とするガセットタイプ包装袋。At least the inner edges of the rectangular laminated body made of a heat-adhesive resin layer are stacked so that the inner layers are in contact with each other so that the inner layers are in contact with each other to form a tubular body having a palm seal portion, the palm seal portion Are formed with a V-shaped fold in the opposite side portions of the cylindrical body so as to constitute a back seal portion, and the root portion of the palm seal portion is substantially the same as the fold tip portion of one of the fold portions. In the gusset-type packaging bag, which is configured to be in a matching position, and the upper and lower end edges of the cylindrical body are thermally bonded with the upper and lower end edge heat bonding parts and sealed, the two side edges of the other folding part A side edge thermal bonding part is provided at a position opposite to the part, and an opening start means is formed at a position opposite to the side edge thermal bonding part, on the tear imaginary line when the packaging bag is torn by the opening start means. The front end and the front of the one folding part An opening assisting thermal adhesive portion is provided that thermally bonds the inner layers across the folding tip and the root portion of the joint seal portion so as to include the root portion of the joint seal portion, and the inside of the opening assist thermal adhesive portion. An opening assisting means for cutting at least the folding tip of one folding part and the root part of the joint seal part is provided, and the opening assisting thermal adhesive part is provided in connection with the upper edge thermal adhesive part. The gusset type packaging bag is characterized in that the opening assisting means is formed by a notch penetrating through the packaging bag that does not reach the peripheral end of the opening assisting thermal bonding portion.