JP4386731B2

JP4386731B2 - Easy-open packaging bag

Info

Publication number: JP4386731B2
Application number: JP2003556309A
Authority: JP
Inventors: 健二郎阿部; 哲男松下
Original assignee: Asahi Kasei Pax Corp
Current assignee: Asahi Kasei Pax Corp
Priority date: 2001-12-26
Filing date: 2002-12-26
Publication date: 2009-12-16
Anticipated expiration: 2022-12-26
Also published as: CN1610633A; WO2003055761A1; EP1468931A4; AU2002357523A1; KR20040063004A; JPWO2003055761A1; EP1468931A1

Description

＜技術分野＞
本発明は、手で容易に袋の片面を直線状に所定の幅で引裂き開封することを可能にする易開封性包装袋に関する。
本発明は、食品、衣料品、医薬品、雑貨やその他多くの包装分野で用いられる包装袋に関し、さらには、流通段階では密封状態を保ち、消費者などによる開封後も必要により密封状態を再現できるジッパー付きで、易開封性の包装袋に関する。
＜背景技術＞
各種の合成樹脂を用いた密封性袋体が、食品、衣料品、医薬品、雑貨やその他多くの包装分野で利用されており、内容物を使用する際には、何らかの方法で袋を破ってから内容物を取り出す必要がある。
従来、平袋の密封袋では、鋏、包丁、ナイフなどを用いて袋の開封端部を切断して、充填された内容物を取出すように構成されているか、若しくは、これらの道具を用いずに手指で開封できるようにするために、袋のシール端部や折曲げ部にノッチや微細な傷痕を付与しそれを起点にして開封できるように構成されていた。
４方シール袋の従来の開封方法としては、シール部にノッチを設け、このノッチを起点として袋を引裂いて開封し、引き裂いた袋の開口部から内容物を取出すのが一般的である。しかし、内容物が和菓子やクッキーなどの形崩れし易いものや平たい物の場合は、袋を引裂く時に内容物が破壊したり変形したりしてしまう問題点があった。
これを防止するために、特開平１０−２３０９７１号公報には、シールする辺の端部からシール部に至る部分に非接着部を形成し、非接着部のフィルム端部から接着部に一部に食込むノッチを間隔をおいて２箇所設け、この２ヶ所のノッチ間を指で摘んで、袋の片面のみをノッチの間隔幅で帯状に開封できる易開封性包装袋が提案されている。この場合、開封に際してノッチを付与したシール部分の表裏のフィルムを切り離す必要があり、シール部を易剥離性にすることによって表裏のフィルムを剥離して切り離す。そのためには、袋全面のシール部を易剥離性にするかノッチ部分のみを易剥離性にする必要があるが、シール全面を易剥離性にした場合は、流通段階でのシール部の破損の心配がある。また、部分的に開封に必要な分だけ易剥離性にするには、その部分のみ易剥離加工処理する必要があった。
また、特開２００１−５５２４８号公報には、ピロー包装袋であるが合掌シール部に間隔をおいてノッチを２ヶ所設け、ノッチ間の合掌シール部を摘んで引き裂くことによって袋を円周状に開封する方法が提案されている。しかし、この場合も、合掌シール部の根元で左右のフィルムを切り離す必要があり、開封を進行させるフィルムと反対側のフィルムの合掌シール部の根元に当たる部分に微細な傷痕を設けることによって、反対側のフィルムをその部分で切断して切離すようになっている。そのため、フィルムに微細な傷痕を付与する工程が別途必要となり、また、傷痕を付与した部分の強度が低下する問題点があった。
つまり、上記のような開封方法では、袋の形状によらずにシール部で一方のフィルムをもう一方のフィルムから切離す必要がある。つまり、弱接着の易剥離性シールにして剥離によるか、易裂性にしてフィルム切断によるかの違いはあるが、いずれにせよ、この切り離す必要性のために上記のような問題点が発生していた。
ところで、内容物によっては、袋を開封した後に小出しに使用するが、開封後も内容物を再密封しておきたい場合があり、この目的に適合した再密封可能な咬合開閉機能を有するジッパーを付与した包装袋が知られている。
従来のジッパー付き包装袋では、袋の表裏２枚のフィルムを、開封の際に同じように引裂いて使用する。この場合、図８に記載したように、引裂いた袋の表裏のフィルム端１９−１及び１９−２が開封部分の全長に渡ってほぼ重なり合って同一線状になるため、包装袋の開封後又は再封後にジッパーを開いて内容物を取出すに当って袋の引裂き口の表裏のフィルムを分けるための指掛かりがなく、表裏のフィルムを左右に引き離す口開き性が悪いという問題点があった。
本発明は、比較的簡単な加工のみで実現でき、かつ包装袋のシール強度や包装袋自体の強度を低下させることなく、流通段階でシール部分が剥離するおそれがないにもかかわらず、手で容易に開封できる包装袋を提案することを課題とする。また、包装袋の開封後の再密封が可能で、しかも口開き性が良好なジッパー付き包装袋を提供することを課題とする。
＜発明の開示＞
本発明は、表側と裏側の２枚のフィルムの周辺部が互いに接着されて密封された袋であり、表側フィルムの一方向における直線カット性が裏側フィルムのいずれの方向における直線カット性より大きく、かつ、前記の一方向と交差する接着周辺部の一部に、前記一方向に沿って表側フィルムの切断を開始できる処理部が設けられた包装袋に関する。この構成により、流通段階でシール部分が剥離したりするおそれが無く、しかも簡単に開封することができる包装袋が得られる。
更に本発明は、表側と裏側の２枚のフィルムの周辺部が互いに接着されて密封された袋本体部と、及び袋本体部の開封端側の前記接着周辺部より内側に再密封可能に設けられたジッパー部とを有するジッパー付き包装袋であり、表側フィルムの一方向における直線カット性が裏側フィルムのいずれの方向における直線カット性より大きく、前記ジッパー部が前記の一方向に沿って設けられており、かつ、袋本体部の開封端側の接着周辺部と前記ジッパー部との間にあって、前記の一方向と交差する接着周辺部の一部に、前記一方向に沿って表側フィルムの切断を開始できる処理部が設けられた包装袋に関する。この構成により、流通段階でシール部分が剥離したりするおそれが無く、しかも簡単に開封することができ、さらに、再密封する際に口開き性のよいジッパー付き包装袋が得られる。
また、前記の包装袋の表側フィルムが、一方向における直線カット性が裏側フィルムのいずれの方向における直線カット性より大きい直線カット性フィルム層と熱融着性樹脂フィルム層とを含む積層フィルムからなり、裏側フィルムは、熱融着樹脂フィルム層を含む積層フィルムからなり、かつ表側フィルムと裏側フィルムの熱融着性樹脂フィルム層どうしが対向するように設けられていることが好ましい。この構成により、接着剤を用いることなく、上記の袋を密封することが可能となる。
また、表側フィルムが直線カット性のあるフィルム層と熱融着性樹脂フィルム層とを含む積層フィルムからなり、裏側フィルムは、直線カット性を有すフィルムを含まない熱融着性樹脂フィルム層を含む積層フィルムからなるフィルム構成であってもよい。
前記接着周辺部は袋の周辺に、熱融着や接着などにより設けられるが、袋の４方に熱融着で設けられていると好ましい。
前記処理部は、包装袋の接着周辺部の外縁端に設けられた少なくとも２箇所の近接したノッチであると好ましい。この構成により、ノッチを設ける簡単な加工のみで、開封を開始することができる。
また処理部は、包装袋の接着周辺部域に設けられたツマミ形状の切込みであってもよい。この構成により、流通段階で袋が誤って開封される事故のおそれが小さくなる。
処理部近傍の接着周辺部の幅が、他の接着周辺部の幅より広く構成されていることが好ましい。この構成により、さらに、流通段階の開封事故が生じるおそれが小さくなる。
尚、上記の処理部は複数箇所に設けられていてもよい。
直線カット性フィルム層は、一軸延伸ポリオレフィン系フィルム、二軸延伸ポリアミド系フィルム、または二軸延伸ポリエステル系フィルムのいずれかにより構成されていることが好ましい。
＜発明を実施するための最良の形態＞
本発明の包装袋の例を、図面を参照しながら説明する。
図１は、４方シール袋の一部の断面図であり、表側フィルム２と裏側フィルム３のそれぞれの積層構成と、包装袋１を構成する際のその相対的な配置とが図示されている。ここで、表側の積層フィルム２は、直線カット性を有するフィルムである。裏側の積層フィルム３は、直線カット性がないか若しくは積層フィルム２より直線カット性が小さいフィルムである。
本発明にいう直線カット性とは、以下の測定方法で定義される性質を言うこととした。すなわち、フィルム製造時の流れ方向及び流れ方向に直角方向に沿って、２５０ｍｍ四方の正方形にフィルムを切り出す。直線カット性を試験する方向と垂直な切出し片の縁端に３０ｍｍの間隔をおいて２箇所のノッチを入れる（図９）。３０ｍｍの切れ目を指で掴んで直線カット方向と平行な方向にフィルムを引裂く（図９の点線のようにフィルムが切れる）。一般にフィルムは、分子の配向やブレンド成分の配向の方向によっては、フィルムの切れ具合がフィルムの引裂き方向によって異なることがあるため、上記の引裂き試験をフィルムの左方向、右方向それぞれについて行い、引裂いたときに引裂きの先端が細くなった方のフィルムの先端“Ｘ”の幅をもって直線カット性を判断する。Ｘの値が３０ｍｍに近い程直線カット性が良好である。Ｘの値が５ｍｍ未満又は引裂き端が対向する端縁まで至らないものを直線カット性がないフィルムと言う。
図１の４方シール袋は、表側積層フィルム２と裏側積層フィルム３の２種類のフィルムから構成される。
表側積層フィルム２は、基材フィルム層４−１、直線カット性を有するフィルム層５及び熱融着性フィルム層６−１からなる。袋の要求特性によっては、基材フィルム層４−１と直線カット性を有するフィルム層５の積層の順番は逆でも良いし、基材フィルム層４−１は無くてもよい。また、図示はしていないが、このほかの中間フィルム層が積層されていても良い。
さらに、図１の表側積層フィルム２は、直線カット性のあるフィルムを層構成の一部に用いて積層フィルムに直線カット性を付与しているが、この他の方法として例えば、特開平９−１５６６４９号報に記載されているフィルムの分子配向性が相違する２枚のフィルムを背中合せに積層した、即ち２枚のフィルムが１組になって直線カット性を発揮するような組合せのフィルム層を層構成の一部に用いて表側積層フィルムに直線カット性を付与しても良い。
裏側積層フィルム３は、基材フィルム層４−２、中間フィルム層７及び熱融着性フィルム層６−２からなる。ただし、中間フィルム層７は無くても良い。
基材フィルム層４−１及び４−２には、ポリプロピレンなどのポリオレフィン系樹脂フィルム、ナイロン６、ナイロン６６、ナイロン１２などのポリアミド系樹脂フィルム、ポリエチレンテレフタレート、ポリブチレンテレフタレートなどのポリエステル系樹脂フィルムなどの二軸延伸フィルムが好ましく用いられる。
直線カット性を有するフィルム層５には、一軸延伸ポリエチレンフィルム、一軸延伸ポリプロピレンフィルムなどの縦一軸又は横一軸延伸ポリオレフィン系樹脂フィルムや、例えば特開平７−１１３０１５号公報に記載されたような、ナイロン６樹脂にポリメタキシリレンアジパミド樹脂を混合して層分離構造と延伸条件を工夫した二軸延伸ポリアミド系フィルム、又例えば特開平１１−３００９１６号公報に記載されたような、ポリエチレンテレフタレート樹脂にポリブチレンテレフタレート系樹脂を混合して層分離と延伸条件を工夫した二軸延伸ポリエステル系フィルムなどがある。
熱融着性樹脂フィルム層６−１および６−２としては、低密度ポリエチレン、直鎖状低密度ポリエチレン、エチレンと共重合可能なビニル化合物との共重合樹脂、或いはポリプロピレン系樹脂のフィルムが用いられる。なお、フィルム層６−１と６−２の樹脂の種類は同一であることが好ましい。
袋に充填した内容物を保存する上で積層フィルムに水蒸気、ガスバリア性やアロマバリア性などを要求される時は、基材フィルム層４−１、４−２にポリ塩化ビニリデン樹脂層もしくはエチレンビニルアルコール樹脂を主体とする樹脂層をコーティングしたフィルムや、金属酸化物、金属などを蒸着したフィルムを選択するか、中間フィルム層７として、ガスバリア性を有するフィルム、例えばアルミニウムなどの金属箔、ポリ塩化ビニリデン樹脂フィルム、エチレンビニルアルコール樹脂フィルムやこれらと他の樹脂との共押出しフィルムなどのフィルムを積層することが出来る。また、フィルムに剛性、意匠性などが要求される時は、紙を積層することも出来る。
表側積層フィルム２と裏側積層フィルム３は、熱融着性フィルム層６−１と６−２とを対向させて、常法に従って４方シール袋に製袋される。積層フィルムの製造方法は特に制限されるものではなく、フィルム同士を接着剤を用いて積層するドライあるいはウェットラミネーション法、Ｔダイスから溶融ポリエチレンなどを押出すことによって積層するサンドラミネーション法、Ｔダイスから溶融ポリエチレンなどを押出して積層する押出しラミネーション法、低融点の熱融着性樹脂を用いたサーマルラミネーション法などが目的に応じて用いられる。
図２から図５は、ジッパー付き４方シール袋８の例で、袋８は、表側積層フィルム２と裏側積層フィルム３（図では、紙面の表側に表側積層フィルムが位置するものとする）が、開封端側の横シール９−１と閉鎖端側の横シール、二本の縦シール９−２で袋の４方がシールされている。つまり、開封端側の横シール９−１と閉鎖端側の横シール、二本の縦シール９−２で包装体もしくはフィルムの周辺部を形成している。横シール９−１とジッパー１０の間の縦シールの融着部には、たやすく切断が開始できるようにするための処理部１１が設けられている。袋８は、通常、一旦３方がシールされ１方が開口した状態に成形された袋に内容物を充填した後開口面をシールして得られる。
図２の袋８は、表側積層フィルム２が横シール９−１と平行な矢印で示した方向の直線カット性を有しており、この方向と直角方向の縦シール９−２の端部に矢印の直線カット方向に表側積層フィルム２を引裂くための引裂き開始部位となるコ又はＵ、Ｖ字等の切り込み１２が設けられている。切り込み１２は、フィルムの直線カット性の方向と略平行に切り込み１２の対称軸が配置されるようになされ、かつ、切り込み１２は、直線カット性の方向に沿って袋の外縁に最も近い部分が切り込まれるようになされる一方、直線カット性の方向に沿って袋の外縁から最も離れた部分には切り込みがなされずにフィルムにつながったままとなるようになされている。その結果、切り込み部分が手指でつまみ得るツマミ形状を形成する。このツマミ形状部分が処理部１１となる。
図３においては、シール部（周辺部）のうち、処理部１１の近傍に位置する縦シール９−２の一部が袋の内部側に突出した部分１３−１を設けている。したがって、シール部分の幅を局部的に他のシール部より広幅としている。この様にすることによって、袋のシール部分の内側の端縁と切込み１２の先端との間隔が短くなることによる、意図しない処理部１１からの破袋事故の可能性を減少できる。なお、図３は、処理部１１の突出部１３−１が、横シール９−１に跨っている例で、図４は突出部分１３−２が横シール９−１に跨ってない例である。図３及び図４の突出シール部１３−１、１３−２の形状は角張った形状を示しているが、これ以外の例えば角部が丸い形状でも良い。
図５は、処理部１１としてシール部の外縁端にノッチ１４−１および１４−２を、一定間隔をおいて近接して２箇所設けた例である。この図では、大きなノッチ１４を２箇所設けた例を示したが、ノッチ１４の代わりに微細な傷痕をシール外縁端に沿って設けても良い。図５の処理部１１において、直線カットのきっかけとなるノッチ若しくは傷痕は、少なくとも２ヶ所あることが望ましく、しかもその２ヶ所は直線カット方向に対して直角方向にある程度の距離を有することが望ましい。この２か所からスタートする二本の略平行の引き裂き線により裂けた開封片により、袋の他の部分に影響することなく開封することができる。
具体的には、図２から図５の処理部１１の切込み１２の大きさ、ノッチ１４の間隔は、指先で切込み部をつまんで引張ることが出来る大きさであれば良く、具体的には５ｍｍから１５ｍｍ程度であれば良い。この切込み１２の大きさやノッチ１４の間隔は、袋を開封した時の表側フィルム２の引き裂きの幅を規定し、引裂き幅を変更したい時はこの長さを変更すれば良い。なお、ノッチ１４の方向は、直線カット方向に略平行に設けている。処理部１１の切込み１２やノッチ１４などは、袋を製袋する時に施される。
図６は、図２の４方シール袋８の開封の途中状態を表わしたもので、開封は図２の処理部１１の切込み１２を指で起こしてつまみ、袋の表側積層フィルム２の矢印で示した直線カット方向、即ち処理部１１を設けた縦シール９−２と直角方向（図６の矢印引張り方向）に引張る。表側積層フィルム２は、直線カット性を有するフィルム５が積層されているため切込み１２の間隔幅の開封片として略直線状の引裂き線１５で引裂ける。
一方、裏側積層フィルム３は直線カット性を有さないか小さいため、表側積層フィルム２の直線方向の引裂き力に影響されて直線方向の引裂き力が付与されるものの、袋の内側のシール端縁から少し中に入った個所で引裂き線１６の様に先細り状になって引裂けて裏側積層フィルムの内表面の一部が切り取られ、その一部は開封片１７と一緒に裏側積層フィルムから分離する。その結果、表側積層フィルム２のみを開封片１７として切取ることが出来る。
この様にして、このたやすく開封できる４方シール袋は、シール部を易剥離性としたり、裏側のフィルムのシール際に易裂性加工をする必要がないため袋の強度を損なうことなく、表側積層フィルム２のみを所定の幅で引裂いて開封することが出来る。
また、開封片１７による引き裂きは、開封を開始したシール部から、直線カット性方向に沿って相対するシール部に達して停止する。このため、開封片１７は袋に付いたまま残り塵として散乱することが無い。図７は、図６のＡ−Ａ矢視図で開封部の袋の断面図である。３は裏側積層フィルム、２は表側積層フィルム、９−１は横シール部、１０はジッパー、１８は開封片１７を引裂いたあとの表側積層フィルム２が取り去られた空間である。
内容物を取出すには、表側積層フィルム２の開封片１７を取り去った空間部１８に指を突っ込むことによって簡単に表側積層フィルム２の切断端に指を掛けて表側積層フィルム２と裏側積層フィルム３を左右に開くことができ、ジッパー１０の噛み合せを外して開くことができる。
なお本発明の包装袋には、もちろんジッパー１０を設けなくてもよい。
このようにして本発明の易開封性包装袋は、シール部を易剥離性としたり、裏側のフィルムのシール際に易裂性加工を施すこと無く、４方シール袋８の表側積層フィルム２のみを開封できる。
上記の包装袋には、消費者が袋の開封開始部分を認知したり開封方法を理解するための説明図や文章が印刷されていても良い。包装袋に充填する内容物は特に限定されないが、和菓子、洋菓子、ケーキの様に形崩れし易いものや、薄焼き煎餅、クッキー、ウェハス、棒菓子などの割れたり折れたりし易いもの、ウェットティシュー、ナプキン、スライスハム、スライスチーズなどの平たいもの、乾物などの包装には特に適する。
＜実施例＞
［実施例１］
表側積層フィルムとして、ユニチカ株式会社製の厚み１２μｍの縦方向直線カット性ポリエチレンテレフタレートフィルムのエンブレットＰＣと、厚み７μｍのアルミニウム箔をアンカーコート剤を介して、Ｔダイスより密度０．９２０ｇ／ｃｍ^３で厚み１５μｍの低密度ポリエチレンを押出すことによりサンドラミネーション法により貼り合わせ、次いでアルミニウム箔側にＴダイスより厚み３０μｍの上記の低密度ポリエチレンを押出して積層した。裏側積層フィルムとして、直線カット性ポリエチレンテレフタレートフィルムの替りに直線カット性を有さない厚み１２μｍの通常のポリエチレンテレフタレートフィルムを用いた以外は上記と同様にして積層フィルムを得た。
製袋機で、この袋の表裏になるフィルムを低密度ポリエチレンフィルム面同士を対向させて２軸繰出し機から連続的に繰出すと伴にジッパー帯を繰出すことによって、製袋機の流れ方向に平行なジッパーを付与した側と反対側の袋の１辺が開口し３方がシールされたシール幅１０ｍｍでフィルムの流れ方向（袋の横方向）の長さが１００ｍｍ、流れと直角方向（袋の縦方向）の長さが１５０ｍｍの所謂横取り製袋の袋を得た。ジッパー帯はその上端が横シールの内端縁から１５ｍｍの位置になる様に設け、図３の様な幅（図３紙面上における縦方向長さ）１０ｍｍ、長さ（図３紙面上における横方向長さ）５ｍｍのコの字型の、フィルムとつながっている部分が袋の内側に向いた処理部１１となるように、切込み１２を横シールとジッパー間の中央位置の縦シールのシール外端縁から３ｍｍ入った位置に付与した。
次に、この袋に、袋の開口部から内容物として幅２０ｍｍ、厚さ１０ｍｍのウェハスを３個並べて挿入し開口部をシールして４方シール袋とした。コの字型の切り込みを摘んで図６の矢印方向に引張って開封したところ、裏側積層フィルムが袋の内側のシール端縁から１０ｍｍの所で図６の１５の様に先端が先細り状になって開封片１７から切り取られ、内容物を壊すこともなく、安定して表側積層フィルムの約１０ｍｍの幅のみを引裂き開封することができた。また、開封片１７が切取られた後の空間部１８に指先を突っ込んで袋の表裏フィルムを容易に引き離すことができ、さらに、ジッパーを開いて内容物をスムースに取出すことができた。
［実施例２］
表側積層フィルムとして、出光ユニテック株式会社性の厚み１５μｍの縦方向直線カット性ポリアミドフィルムのユニアスロンＴＢ１０００と厚み５０μｍの直鎖状低密度ポリエチレンフィルムを、２液性ポリウレタン接着剤を用いてドライラミネート法により積層した。裏側積層フィルムとして、直線カット性ポリアミドの替りに直線カット性を有さない厚み１５μｍの通常のナイロン６フィルムを用いた以外は実施例１と同様にして積層フィルムを得た。これらの積層フィルムを実施例１と同様にして製袋しジッパー付き袋を得た。但し、処理部は、シール端部を図３の１３−１の様に包装袋の内部側に５ｍｍ突出させてシール部の幅を局部的に１５ｍｍの広幅としてそのシール外端部から５ｍｍ入った位置に実施例１と同様の切込みを付与した。
次に、実施例１と同様にして袋を評価したところ、裏側積層フィルムが袋の内側のシール端縁から１３ｍｍの所で、やはり先端が先細り状になって開封片１７から切り取られており、内容物を壊すこともなく安定して表側積層フィルムの約１０ｍｍの幅のみを引裂き開封することができた。さらに、ジッパーの口開き性も良好であった。
［実施例３］
表側積層フィルムとして、実施例２の裏側積層フィルムに用いた直線カット性を有さない厚み１５μｍのナイロン６フィルムと、厚み２５μｍの東レ株式会社製の横一軸延伸ポリプロピレンフィルムＹＴ２２及び厚み３０μｍの直鎖状低密度ポリエチレンフィルムを２液性ポリウレタン系接着剤を用いて、この順番に積層した。また、裏側フィルムには実施例２と同様の裏側フィルムを用いた。
この袋の表裏になる積層フィルムを２軸繰出し機を有する製袋機で製袋し製袋機の流れ方向の袋の１辺が開口し３方をシールした縦１５０ｍｍ、横１００ｍｍ、シール幅１０ｍｍの袋を得た。このとき、実施例１，２で設けたようなジッパーは設けなかった。
この袋の製袋機の流れ方向のシール部に袋の端から２５ｍｍの位置にシール端縁と直角方向に長さ５ｍｍの第１のＩノッチを付与し、そこからシール端縁方向に１０ｍｍの距離離して第２のＩノッチを付与した。
［比較例１］
実施例１の表側積層フィルムを袋の裏側にも用いて、即ち袋の表裏とも直線カット性のある積層フィルムを用いた袋を用い、実施例１と同様にして製袋した。
次に、実施例１と同様にして袋の評価を行なった。この袋は、裏側積層フィルムを開封片から切り離すことができず、開封できなかった。
［比較例２］
実施例２の裏側積層フィルムを袋の表側にも用いて、即ち袋の表裏とも直線カット性では無い積層フィルムを用いた袋を実施例２と同様にして製袋した。
次に、実施例１と同様にしてこの袋を評価したところ、切込みのつまみ部分を指で摘んで引つ張る時の力の入れ方とその方向で裏側積層フィルムの切り取られ方が変化して不安定なために、スムースな開封ができなかった。
本発明を詳細にまた特定の実施態様を参照して説明したが、本発明の精神と範囲を逸脱することなく様々な変更や修正を加えることができることは当業者にとって明らかである。
本出願は、２００１年１２月２６日出願の日本特許出願（特願２００１−３９３７０７）、２００２年６月２７日出願の日本特許出願（特願２００２−１８７４４２）、に基づくものであり、その内容はここに参照として取り込まれる。
＜産業上の利用可能性＞
開封開始個所となる処理部を設ける他には特別な加工を必要とせず、手で容易に袋の片面を直線状に所定の幅で引き裂き開封することが可能である。また、ジッパーを有している場合には、開封後のジッパーの口開き性が良好である。
【図面の簡単な説明】
図１は、包装袋と、それを構成する積層フィルムの一部の断面の概念図である。
図２は、ジッパー付き包装袋の１例の表側平面図である。
図３は、ジッパー付き包装袋の他の例の表側平面図である。
図４は、ジッパー付き包装袋のさらに他の例の表側平面図である。
図５は、ジッパー付き包装袋のさらに他の例の表側平面図である。
図６は、ジッパー付き包装袋の開封状況を示す概念図である。
図７は、ジッパー付き易開封性包装袋の開封状況を示す断面の概念図である。
図８は、従来のジッパー付き包装袋の開封状態の断面の概念図である。
図９は、直線カット性の概念を示す模式図である。
なお、図中の符号、１は包装袋、２は表側積層フィルム、３は裏側積層フィルム、４−１は表側積層フィルムの基材フィルム層、４−２は裏側積層フィルムの基材フィルム層、５は直線カット性フィルム層、６−１は表側積層フィルムの熱融着性フィルム層、６−２は裏側積層フィルムの熱融着性フィルム層、７は中間フィルム層、８は４方シール袋、９−１は横シール、９−２は縦シール、１０はジッパー、１１は処理部、１２は切込み、１３−１，１３−２はシール突出部、１４−１，１４−２はノッチ、１５は表側積層フィルムの引裂き線、１６は裏側積層フィルムの引裂き線、１７は開封片、１８は開封片１７を取り去ったあとの開封空間、１９−１，１９−２は従来の包装袋のフィルムの切断端面である。<Technical field>
The present invention relates to an easily openable packaging bag that allows one side of a bag to be easily teared and opened with a predetermined width by hand.
The present invention relates to a packaging bag used in food, clothing, pharmaceuticals, miscellaneous goods and many other packaging fields. Furthermore, the sealed bag can be kept in the distribution stage, and the sealed state can be reproduced if necessary after being opened by a consumer. It relates to an easy-open packaging bag with a zipper.
<Background technology>
Sealing bags made of various synthetic resins are used in food, clothing, pharmaceuticals, miscellaneous goods and many other packaging fields. When using the contents, break the bags in some way. It is necessary to take out the contents.
Conventionally, flat bag sealed bags are configured to cut the open end of the bag using a scissors, knife, knife, etc., and take out the filled contents, or without using these tools In order to allow the bag to be opened with fingers, a notch or a fine scar is provided at the seal end or folded portion of the bag, and the bag can be opened from that point.
As a conventional method for opening a four-side sealed bag, it is common to provide a notch in the seal portion, tear and open the bag starting from this notch, and take out the contents from the opening portion of the torn bag. However, when the contents are easily deformed or flat, such as Japanese confectionery or cookies, there is a problem that the contents are broken or deformed when the bag is torn.
In order to prevent this, Japanese Patent Application Laid-Open No. 10-230971 discloses that a non-adhesive portion is formed in a portion from the end portion of the side to be sealed to the seal portion, and a part from the film end portion of the non-adhesive portion to the adhesive portion. There have been proposed easy-open packaging bags in which two notches are provided at intervals, and the two notches are gripped with fingers, and only one side of the bag is opened in a band shape with a notch interval width. In this case, it is necessary to separate the front and back films of the seal portion provided with a notch at the time of opening, and the front and back films are peeled off by making the seal portion easy to peel. For that purpose, it is necessary to make the seal part on the entire surface of the bag easily peelable or only the notch part easy to peel. However, if the whole seal surface is made easy to peel, the seal part may be damaged in the distribution stage. I am worried. Moreover, in order to make it partly easy to peel as much as necessary for opening, it was necessary to perform easy peeling processing only for that part.
Japanese Patent Application Laid-Open No. 2001-55248 discloses a pillow packaging bag having two notches provided at intervals between the palm seal portions, and by gripping and tearing the palm seal portions between the notches to make the bag circumferential. A method of opening is proposed. However, in this case as well, it is necessary to separate the left and right films at the base of the joint seal part, and by providing fine scratches on the opposite side of the film on the opposite side of the film on which the opening is progressing, The film is cut at that part and separated. For this reason, a process for imparting fine scratches to the film is required separately, and there is a problem that the strength of the portion imparted with the scars is reduced.
That is, in the opening method as described above, it is necessary to separate one film from the other film at the seal portion regardless of the shape of the bag. In other words, there is a difference between peeling with a weakly adhesive easy-peeling seal or by tearing and film cutting, but in any case, the above-mentioned problems occur due to the necessity of separation. It was.
By the way, depending on the contents, it is used for dispensing after opening the bag, but there are cases where it is desired to reseal the contents even after opening the bag, and a zipper having a resealable occlusal opening and closing function suitable for this purpose is provided. The given packaging bag is known.
In the conventional packaging bag with a zipper, two films on the front and back sides of the bag are similarly torn and used at the time of opening. In this case, as described in FIG. 8, since the film ends 19-1 and 19-2 on the front and back of the torn bag almost overlap each other over the entire length of the unsealed portion and become collinear, There was a problem that there was no finger hook for separating the film on the front and back of the bag tearing opening when the zipper was opened after the reseal and the contents were taken out, and the opening of the film on the front and back was separated right and left.
The present invention can be realized only by relatively simple processing, and without reducing the sealing strength of the packaging bag or the strength of the packaging bag itself, even though there is no possibility that the sealing portion peels off at the distribution stage. It is an object to propose a packaging bag that can be easily opened. It is another object of the present invention to provide a zippered packaging bag that can be resealed after the packaging bag is opened and has good opening characteristics.
<Disclosure of invention>
The present invention is a bag in which the peripheral portions of the two films on the front side and the back side are adhered to each other and sealed, and the linear cut property in one direction of the front side film is larger than the linear cut property in any direction of the back side film, And it is related with the packaging bag by which the process part which can start the cutting | disconnection of a front side film along the said one direction was provided in a part of adhesion | attachment peripheral part which cross | intersects said one direction. With this configuration, there can be obtained a packaging bag that can be easily opened without the possibility of the seal portion being peeled off at the distribution stage.
Further, the present invention provides a bag body portion in which the peripheral portions of the two films on the front side and the back side are bonded to each other and sealed, and re-sealable inside the bonding peripheral portion on the opening end side of the bag body portion. A zippered packaging bag having a linear cut property in one direction of the front side film greater than a linear cut property in any direction of the back side film, and the zipper part is provided along the one direction. And cutting the front-side film along the one direction at a part of the adhesion peripheral portion that is between the zipper portion and the adhesion peripheral portion on the unsealing end side of the bag main body portion. It is related with the packaging bag provided with the process part which can start. With this configuration, there is no possibility that the seal portion is peeled off at the distribution stage, and it can be easily opened, and furthermore, a packaging bag with a zipper having a good opening property when resealing can be obtained.
Further, the front film of the packaging bag comprises a laminated film including a linear cut film layer and a heat-fusible resin film layer in which the linear cut property in one direction is greater than the linear cut property in any direction of the back film. The back film is preferably a laminated film including a heat-sealing resin film layer, and is provided so that the heat-sealing resin film layers of the front film and the back film are opposed to each other. With this configuration, the above bag can be sealed without using an adhesive.
Further, the front side film is composed of a laminated film including a film layer having a linear cut property and a heat fusible resin film layer, and the back side film is a heat fusible resin film layer not including a film having a linear cut property. The film structure which consists of a laminated | multilayer film containing may be sufficient.
The adhesion peripheral portion is provided around the bag by heat fusion, adhesion, or the like. Preferably, the adhesion peripheral portion is provided on four sides of the bag by heat fusion.
The processing part is preferably at least two adjacent notches provided at the outer edge of the bonding peripheral part of the packaging bag. With this configuration, unsealing can be started only by a simple process of providing a notch.
Further, the processing section may be a knob-shaped cut provided in the adhesion peripheral area of the packaging bag. With this configuration, the risk of accidental opening of the bag at the distribution stage is reduced.
It is preferable that the width of the adhesion peripheral portion in the vicinity of the processing portion is wider than the width of the other adhesion peripheral portions. This configuration further reduces the possibility of a distribution stage opening accident.
In addition, said process part may be provided in multiple places.
The straight-cut film layer is preferably composed of any one of a uniaxially stretched polyolefin film, a biaxially stretched polyamide film, and a biaxially stretched polyester film.
<Best Mode for Carrying Out the Invention>
The example of the packaging bag of this invention is demonstrated referring drawings.
FIG. 1 is a cross-sectional view of a part of a four-side seal bag, in which the laminated structure of the front film 2 and the back film 3 and the relative arrangement of the packaging bag 1 are illustrated. . Here, the laminated film 2 on the front side is a film having a linear cut property. The laminated film 3 on the back side is a film having no linear cut property or having a smaller linear cut property than the laminated film 2.
The linear cut property referred to in the present invention refers to a property defined by the following measurement method. That is, the film is cut into a square of 250 mm along the flow direction at the time of film production and the direction perpendicular to the flow direction. Two notches are made at an interval of 30 mm at the edge of the cut piece perpendicular to the direction in which the straight cut property is tested (FIG. 9). The film is torn in a direction parallel to the straight cut direction by grasping a 30 mm cut with a finger (the film is cut as shown by a dotted line in FIG. 9). In general, depending on the orientation of the molecules and the orientation of the blend components, the degree of film breakage may vary depending on the tear direction of the film. Therefore, the above tear test is performed for each of the left and right directions of the film. The straight-cut property is determined based on the width of the leading end “X” of the film that has a narrowed leading end. The closer the value of X is to 30 mm, the better the linear cut property. A film whose X value is less than 5 mm or whose tearing edge does not reach the opposite edge is called a film having no linear cut property.
The four-side sealed bag in FIG. 1 is composed of two types of films, a front side laminated film 2 and a back side laminated film 3.
The front side laminated film 2 includes a base film layer 4-1, a film layer 5 having a linear cut property, and a heat-fusible film layer 6-1. Depending on the required characteristics of the bag, the order of lamination of the base film layer 4-1 and the film layer 5 having the linear cut property may be reversed, or the base film layer 4-1 may not be provided. Further, although not shown, other intermediate film layers may be laminated.
Further, the front-side laminated film 2 in FIG. 1 uses a film having a linear cut property as a part of the layer structure to impart a linear cut property to the laminated film. No. 156649, two films having different molecular orientations are laminated back to back, that is, a film layer of a combination in which two films are combined into one set to exhibit linear cut properties. You may give linear cut property to a front side laminated | multilayer film using it for a part of layer structure.
The back side laminated film 3 includes a base film layer 4-2, an intermediate film layer 7, and a heat-fusible film layer 6-2. However, the intermediate film layer 7 may be omitted.
For the base film layers 4-1 and 4-2, polyolefin resin films such as polypropylene, polyamide resin films such as nylon 6, nylon 66 and nylon 12, polyester resin films such as polyethylene terephthalate and polybutylene terephthalate, etc. The biaxially stretched film is preferably used.
For the film layer 5 having a straight cut property, a longitudinally uniaxially or laterally uniaxially stretched polyolefin resin film such as a uniaxially stretched polyethylene film or a uniaxially stretched polypropylene film, or a nylon as described in, for example, JP-A-7-113015 A biaxially stretched polyamide film in which a polymetaxylylene adipamide resin is mixed with 6 resins to devise a layer separation structure and stretching conditions, or a polyethylene terephthalate resin as described in, for example, JP-A-11-300916 There are biaxially stretched polyester films in which polybutylene terephthalate resin is mixed to devise layer separation and stretching conditions.
As the heat-fusible resin film layers 6-1 and 6-2, a low-density polyethylene, a linear low-density polyethylene, a copolymer resin with a vinyl compound copolymerizable with ethylene, or a polypropylene resin film is used. It is done. In addition, it is preferable that the kind of resin of the film layers 6-1 and 6-2 is the same.
When the laminated film is required to have water vapor, gas barrier property, aroma barrier property, etc. for storing the contents filled in the bag, the polyvinylidene chloride resin layer or ethylene vinyl is added to the base film layers 4-1 and 4-2. Select a film coated with a resin layer mainly composed of an alcohol resin, a film deposited with a metal oxide or metal, or a film having a gas barrier property as the intermediate film layer 7, such as a metal foil such as aluminum, polychlorinated Films such as vinylidene resin films, ethylene vinyl alcohol resin films, and coextruded films of these with other resins can be laminated. Further, when the film is required to have rigidity, design properties, etc., paper can be laminated.
The front side laminated film 2 and the back side laminated film 3 are made into a four-side sealed bag according to a conventional method with the heat-fusible film layers 6-1 and 6-2 facing each other. The production method of the laminated film is not particularly limited. From the dry lamination or wet lamination method in which the films are laminated with an adhesive, the sand lamination method in which molten polyethylene is laminated from the T die, and the T die. Depending on the purpose, an extrusion lamination method in which molten polyethylene or the like is laminated by extrusion, a thermal lamination method using a low-melting-point heat-fusible resin, and the like are used.
2 to 5 are examples of a four-side sealed bag 8 with a zipper. The bag 8 includes a front side laminated film 2 and a back side laminated film 3 (in the figure, the front side laminated film is located on the front side of the paper surface). The four sides of the bag are sealed by a horizontal seal 9-1 on the opening end side, a horizontal seal on the closed end side, and two vertical seals 9-2. That is, the peripheral part of the package or film is formed by the horizontal seal 9-1 on the opening end side, the horizontal seal on the closed end side, and the two vertical seals 9-2. At the fusion part of the vertical seal between the horizontal seal 9-1 and the zipper 10, a processing unit 11 is provided for easily starting cutting. The bag 8 is usually obtained by filling the contents into a bag once molded in a state where three sides are sealed and one side is opened, and then the opening surface is sealed.
The bag 8 in FIG. 2 has a straight-cut property in the direction indicated by the arrow parallel to the horizontal seal 9-1 on the front side laminated film 2, and at the end of the vertical seal 9-2 perpendicular to this direction. Incisions 12 such as U, U, V-shaped or the like serving as a tearing start site for tearing the front laminated film 2 in the linear cut direction of the arrow are provided. The notch 12 is arranged such that the axis of symmetry of the notch 12 is arranged substantially parallel to the direction of the straight cut property of the film, and the notch 12 has a portion closest to the outer edge of the bag along the direction of the straight cut property. While being cut, the portion farthest from the outer edge of the bag along the direction of straight cut is not cut and remains connected to the film. As a result, a knob shape in which the cut portion can be pinched with fingers is formed. This knob-shaped portion becomes the processing unit 11.
In FIG. 3, a portion 13-1 of the seal portion (peripheral portion) in which a part of the vertical seal 9-2 located in the vicinity of the processing portion 11 protrudes toward the inner side of the bag is provided. Therefore, the width of the seal portion is locally wider than the other seal portions. By doing so, it is possible to reduce the possibility of an unintended bag breakage accident from the processing section 11 due to a reduction in the distance between the inner edge of the sealed portion of the bag and the tip of the notch 12. 3 is an example in which the protruding portion 13-1 of the processing unit 11 straddles the horizontal seal 9-1, and FIG. 4 is an example in which the protruding portion 13-2 does not straddle the horizontal seal 9-1. . The protruding seal portions 13-1 and 13-2 in FIGS. 3 and 4 have a square shape, but other shapes such as round corner portions may be used.
FIG. 5 is an example in which the notches 14-1 and 14-2 are provided at two locations adjacent to each other at regular intervals on the outer edge of the seal portion as the processing portion 11. In this figure, an example in which two large notches 14 are provided is shown, but fine scratches may be provided along the outer edge of the seal instead of the notches 14. In the processing unit 11 of FIG. 5, it is desirable that there are at least two notches or scratches that trigger a straight line cut, and it is desirable that the two points have a certain distance in a direction perpendicular to the straight cut direction. With the opening pieces that are torn by the two substantially parallel tear lines starting from these two places, the opening can be made without affecting other parts of the bag.
Specifically, the size of the notch 12 and the interval between the notches 14 in the processing unit 11 of FIGS. 2 to 5 may be any size that can be pulled by holding the notch with a fingertip, specifically 5 mm. To about 15 mm. The size of the notch 12 and the interval between the notches 14 define the tear width of the front film 2 when the bag is opened, and this length may be changed when it is desired to change the tear width. In addition, the direction of the notch 14 is provided substantially parallel to the linear cut direction. The notch 12 and the notch 14 of the processing unit 11 are provided when a bag is made.
FIG. 6 shows a state in the middle of opening of the four-side seal bag 8 of FIG. 2, and the opening is made by raising the notch 12 of the processing unit 11 of FIG. 2 with a finger and pinching with the arrow on the front side laminated film 2 of the bag. Pulling is performed in the straight cut direction shown, that is, in a direction perpendicular to the vertical seal 9-2 provided with the processing unit 11 (arrow pulling direction in FIG. 6). The front side laminated film 2 is torn at a substantially straight tear line 15 as an opening piece having an interval width of the notch 12 because the film 5 having a straight cut property is laminated.
On the other hand, since the back side laminated film 3 does not have a straight cut property or is small, it is influenced by the tearing force in the linear direction of the front side laminated film 2 and is given a tearing force in the linear direction. A part of the inner surface of the back side laminated film is cut off at a location where it enters a little from the taper and tears like a tear line 16, and a part of it is separated from the back side laminated film together with the opening piece 17. To do. As a result, only the front laminated film 2 can be cut out as the opening piece 17.
In this way, the four-side sealed bag that can be easily opened does not need to make the seal part easily peelable or tear easily when sealing the film on the back side, so that the strength of the bag is not impaired. Only the front laminated film 2 can be torn and opened with a predetermined width.
Further, the tearing by the opening piece 17 stops from reaching the sealing portion facing along the linear cut property direction from the sealing portion where opening is started. For this reason, the opening piece 17 does not scatter as remaining dust while attached to the bag. FIG. 7 is a cross-sectional view of the bag of the unsealed portion as seen from the arrow AA in FIG. 3 is a back side laminated film, 2 is a front side laminated film, 9-1 is a transverse seal portion, 10 is a zipper, and 18 is a space where the front side laminated film 2 after tearing the opening piece 17 is removed.
In order to take out the contents, the front-side laminated film 2 and the back-side laminated film 3 are simply put on the cut end of the front-side laminated film 2 by pushing a finger into the space 18 from which the unsealed piece 17 of the front-side laminated film 2 is removed. Can be opened to the left and right, and the zipper 10 can be disengaged and opened.
Of course, the packaging bag of the present invention may not be provided with the zipper 10.
Thus, the easy-open packaging bag of the present invention has only the front side laminated film 2 of the four-side sealed bag 8 without making the seal part easily peelable or performing easy tearing when sealing the back side film. Can be opened.
The above-mentioned packaging bag may be printed with explanatory diagrams and texts for the consumer to recognize the opening start portion of the bag and to understand the opening method. The contents to be filled in the packaging bag are not particularly limited. It is particularly suitable for packaging flat items such as napkins, sliced ham, and sliced cheese, and dry matter.
<Example>
[Example 1]
As a front side laminated film, a density of 0.920 g / cm from a T-die is formed by using an emblet PC of a longitudinally linear cut polyethylene terephthalate film having a thickness of 12 μm and an aluminum foil having a thickness of 7 μm manufactured by Unitika Co., Ltd. via an anchor coating agent. ³ The low-density polyethylene having a thickness of 15 μm was extruded and bonded together by a sand lamination method, and then the above-described low-density polyethylene having a thickness of 30 μm was extruded and laminated on the aluminum foil side. A laminated film was obtained in the same manner as above except that a normal polyethylene terephthalate film having a thickness of 12 μm having no linear cut property was used instead of the linear cut polyethylene terephthalate film.
In the bag making machine, the film on the front and back of the bag is continuously fed out from the biaxial feeding machine with the low-density polyethylene film surfaces facing each other, and the zipper strip is fed out, whereby the flow direction of the bag making machine The side of the bag opposite to the side with the zipper parallel to the side is opened and 3 sides are sealed, the seal width is 10 mm, the length in the film flow direction (lateral direction of the bag) is 100 mm, and the direction perpendicular to the flow ( A so-called prefabricated bag having a length of 150 mm in the longitudinal direction of the bag was obtained. The zipper strip is provided so that the upper end is 15 mm from the inner edge of the horizontal seal, and the width (vertical length on the paper surface in FIG. 3) is 10 mm, and the length (horizontal on the paper surface in FIG. 3). (Length in the direction) 5 mm U-shaped, the cutout 12 outside the seal of the vertical seal at the center position between the horizontal seal and the zipper so that the portion connected to the film becomes the processing portion 11 facing the inside of the bag It applied to a position 3 mm from the edge.
Next, three wafers having a width of 20 mm and a thickness of 10 mm were inserted and inserted into the bag as contents from the opening of the bag, and the opening was sealed to form a four-side sealed bag. When the U-shaped notch is picked and pulled in the direction of the arrow in FIG. 6 to open it, the back side laminated film is 10 mm from the inner edge of the bag and the tip is tapered as shown in FIG. It was cut off from the opening piece 17 and it was possible to tear and open only the width of about 10 mm of the front laminated film without breaking the contents. Further, the front and back films of the bag could be easily pulled apart by pushing the fingertip into the space 18 after the opening piece 17 was cut, and the contents could be smoothly taken out by opening the zipper.
[Example 2]
As the front-side laminated film, Idemitsu Unitech Co., Ltd.'s 15 μm-thick longitudinal linear-cut polyamide film Uniathlon TB1000 and 50 μm-thick linear low-density polyethylene film are dry-laminated using a two-component polyurethane adhesive. Laminated. A laminated film was obtained in the same manner as in Example 1 except that a normal nylon 6 film having a thickness of 15 μm having no linear cut property was used instead of the linear cut polyamide as the back side laminated film. These laminated films were made in the same manner as in Example 1 to obtain a zippered bag. However, the processing part protruded 5 mm toward the inner side of the packaging bag as indicated by 13-1 in FIG. 3, and the width of the sealing part was locally 15 mm wide and entered 5 mm from the outer end of the seal. The same cut as in Example 1 was given to the position.
Next, when the bag was evaluated in the same manner as in Example 1, the back side laminated film was 13 mm from the seal edge inside the bag, and the tip was also tapered and cut off from the opening piece 17. Only the width of about 10 mm of the front side laminated film could be torn and opened stably without breaking the contents. Furthermore, the opening of the zipper was also good.
[Example 3]
As the front-side laminated film, a nylon 6 film having a thickness of 15 μm that does not have the linear cut property used in the back-side laminated film of Example 2, a laterally uniaxially stretched polypropylene film YT22 manufactured by Toray Industries, Inc. having a thickness of 25 μm, and a linear film having a thickness of 30 μm. The low-density polyethylene film was laminated in this order using a two-component polyurethane adhesive. Moreover, the back side film similar to Example 2 was used for the back side film.
The laminated film on the front and back of the bag is made by a bag making machine having a biaxial feeding machine, and one side of the bag in the flow direction of the bag making machine is opened and sealed in three directions. The length is 150 mm, the width is 100 mm, and the seal width is 10 mm. Got a bag of. At this time, the zipper as provided in Examples 1 and 2 was not provided.
A first I-notch having a length of 5 mm in a direction perpendicular to the seal edge is provided at a position 25 mm from the end of the bag at the seal portion in the flow direction of the bag making machine, and 10 mm from there to the seal edge direction. A second I-notch was added at a distance.
[Comparative Example 1]
Using the front side laminated film of Example 1 also on the back side of the bag, that is, using a bag made of a laminated film having a linear cut property on both the front and back sides of the bag, bags were made in the same manner as in Example 1.
Next, the bag was evaluated in the same manner as in Example 1. In this bag, the back side laminated film could not be separated from the opened piece, and could not be opened.
[Comparative Example 2]
The back side laminated film of Example 2 was also used on the front side of the bag, that is, a bag using a laminated film that was not linearly cutable on the front and back sides of the bag was made in the same manner as in Example 2.
Next, when this bag was evaluated in the same manner as in Example 1, the manner in which the force was applied when pulling and pulling the knob portion of the incision with the finger and the manner in which the back side laminated film was cut out changed in that direction. Because of the instability, smooth opening was not possible.
Although the present invention has been described in detail and with reference to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention.
This application is based on a Japanese patent application filed on December 26, 2001 (Japanese Patent Application No. 2001-393707) and a Japanese patent application filed on June 27, 2002 (Japanese Patent Application No. 2002-187442). Is incorporated herein by reference.
<Industrial applicability>
In addition to providing a processing section as an opening start location, no special processing is required, and it is possible to easily tear and open one side of the bag in a straight line with a predetermined width. Moreover, when it has a zipper, the opening property of the zipper after opening is favorable.
[Brief description of the drawings]
FIG. 1 is a conceptual diagram of a cross section of a part of a packaging bag and a laminated film constituting the packaging bag.
FIG. 2 is a front plan view of an example of a zippered packaging bag.
FIG. 3 is a front plan view of another example of a packaging bag with a zipper.
FIG. 4 is a front plan view of still another example of a packaging bag with a zipper.
FIG. 5 is a front plan view of still another example of a packaging bag with a zipper.
FIG. 6 is a conceptual diagram showing an opening state of the packaging bag with a zipper.
FIG. 7 is a conceptual view of a cross section showing an opening state of an easy-open packaging bag with a zipper.
FIG. 8: is a conceptual diagram of the cross section of the unsealed state of the conventional packaging bag with a zipper.
FIG. 9 is a schematic diagram showing the concept of linear cutability.
In the drawings, 1 is a packaging bag, 2 is a front side laminated film, 3 is a back side laminated film, 4-1 is a base film layer of the front side laminated film, 4-2 is a base film layer of the back side laminated film, 5 is a linear cut film layer, 6-1 is a heat-fusible film layer of a front laminated film, 6-2 is a heat-fusible film layer of a back laminated film, 7 is an intermediate film layer, and 8 is a four-side sealed bag. 9-1 is a horizontal seal, 9-2 is a vertical seal, 10 is a zipper, 11 is a processing portion, 12 is a cut, 13-1 and 13-2 are seal protrusions, 14-1 and 14-2 are notches, 15 is a tear line of the front side laminated film, 16 is a tear line of the back side laminated film, 17 is an opening piece, 18 is an opening space after the opening piece 17 is removed, 19-1 and 19-2 are films of a conventional packaging bag This is a cut end face.

Claims

A bag peripheral portion of the front side and the back side of the two films were sealed with an adhesive peripheral portion bonded to each other, the front film is a film having a linear cutting resistance in one direction, the back side film during film production Cut the film into a 250 mm square along the direction perpendicular to the flow direction and the flow direction, and place two notches at 30 mm intervals on the edge of the cut piece perpendicular to the direction to test the linear cut property in the perpendicular direction. When the film is torn in a direction parallel to the direction in which the straight cut property is tested by grasping the 30 mm cut with a finger, the leading edge width of the tear at the edge opposite to the edge is less than 5 mm or a film does not reach to the edge facing and a portion of the adhesive periphery intersecting the one direction, along said one direction, the adhered sides film Cutting start processing unit through is provided, wherein the processing unit, the or a notch proximate the at least two places provided on the outer edge of the adhesive periphery, or knob shape provided on the adhesive perimeter area A packaging bag that is a cut.

The front-side film is composed of a laminated film including a linear-cutting film layer and a heat-fusible resin film layer in which the linear-cutting property in one direction is larger than the linear-cutting property in any direction of the back-side film. The packaging bag according to claim 1, wherein the packaging bag is formed of a laminated film including an adhesive resin film layer, and is provided so that the heat-fusible resin film layers of the front film and the back film face each other.

The front side film is composed of a laminated film including a film having a linear cut property and a heat fusible resin film layer, and the back film is a laminated film including a heat fusible resin film layer not including a film having a linear cut property. The packaging bag according to claim 1 or 2, wherein the heat-fusible resin film layers of the front side film and the back side film are opposed to each other.

The packaging bag according to claims 1 to 3, wherein an adhesive peripheral portion is provided on four sides of the bag.

The packaging bag according to any one of claims 1 to 3 , wherein the width of the adhesion peripheral portion in the vicinity of the processing portion is configured wider than the width of other adhesion peripheral portions.

The packaging bag according to any one of claims 1 to 3, wherein the straight-cut film layer is composed of any one of a uniaxially stretched polyolefin film, a biaxially stretched polyamide film, and a biaxially stretched polyester film. .

A bag body part in which the peripheral parts of the two films on the front side and the back side are bonded to each other and sealed by the adhesive peripheral part , and inside the adhesive peripheral part on the opening end side of the bag main body part so as to be resealable. A zippered packaging bag having a zipper part, the front film is a film having a straight cut in one direction, and the back film is 250 mm square along the direction perpendicular to the flow direction and the flow direction during film production. Cut out the film into a square, make two notches at 30mm intervals on the edge of the cut piece perpendicular to the direction to test the straight cut performance at right angles, and test the straight cut performance by grasping the 30mm cut with a finger. When the film is torn in a direction parallel to the cutting direction, the leading edge width of the tear at the edge facing the edge is less than 5 mm or until the edge where the tear is facing Al is not a film, the and zipper portion is provided along the direction of the, and, there between said zipper portion bonded peripheral portion of the opening end side of the bag body portion, crossing the one direction A cutting start processing portion that penetrates the front and back films bonded along the one direction is provided in a part of the bonding peripheral portion that performs the processing, and the processing portion includes at least two portions provided at the outer edge of the bonding peripheral portion. A packaging bag that is a close notch or a knob-shaped notch provided in the peripheral area of the adhesive.