JP3815923B2

JP3815923B2 - Packaging bag and manufacturing method thereof

Info

Publication number: JP3815923B2
Application number: JP20162599A
Authority: JP
Inventors: 芳次茂木; 重行大島
Original assignee: Hosokawa Yoko KK
Current assignee: Hosokawa Yoko KK
Priority date: 1999-07-15
Filing date: 1999-07-15
Publication date: 2006-08-30
Anticipated expiration: 2019-07-15
Also published as: JP2001031111A

Description

【０００１】
【発明の属する技術分野】
本発明は、袋の実用上の強度を損なうことなく手指の力で開封できる易開封部を有する包装袋およびその製造方法に関する。
【０００２】
【従来の技術】
食品、薬品、小物類などの商品を小分けして収容する積層フィルム製の包装袋がある。この包装袋の開封に当たり、刃物を準備することは手間であるために手指のみで容易に開封できることが望ましい。そのために袋の端縁にノッチを設けたもの、もしくは、粗面（傷痕）加工を施したものがある。後者に関してはさらに、積層フィルムを二つ折りして形成される袋の折り返し部分に粗面加工を施したものと、袋のヒートシール部分に、ローラ面に研磨材を設けたローラを連続的に接触されることにより、そのヒートシール部分の全長に亘って直線的で連続した粗面領域を形成したもの（特公昭６１−３９２２８号公報参照）とが知られている。
【０００３】
【発明が解決しようとする課題】
密封小袋に収める内容物としては、薬品や薄いシート状食品などがあり、これらの場合には、開封場所によっては内容物がこぼれたり破損する虞がある。このため、開封可能な場所を限定したいという要求が生じる。また、この種の密封小袋としては四角形のものが主であるが、内容物や利用者のニーズに応じてその形状が変えられることが望ましい。
【０００４】
しかし、上記の特公昭６１−３９２２８号公報に開示されている粗面加工方法を利用した場合は、袋端縁の直線的なシール部に沿って連続した粗面領域を連続形成することしかできないので、開封場所を限定できない。また、袋端縁が複雑なあるいは曲線状の形状を有する場合には、端縁のシール部を粗面加工することができない。前者の場合も、フィルムを折り返して製造できる形状に限られてしまう。
【０００５】
袋体にノッチを設ける場合には、当該袋体の開封場所はノッチを形成した場所に限定される。ノッチ加工を施す包装袋は、包装袋を包装材料加工メーカーが製造してユーザーに納入する場合には、包装材料加工メーカーにおいて、包装袋を形成する段階で包装袋のヒートシール部にノッチ加工を行うことができるが、包装材料加工メーカーが、ロール状の包装材料素材をユーザーに納入し、ユーザーの内容物充填機で内容物を充填しながら包装袋の形成を行う場合には、包装袋のヒートシール部にノッチ加工を施すことが難しい。また、Ｉノッチを設ける場合は、袋の端縁部のどこに切り口が設けられているのか発見しにくく、Ｖノッチを設ける場合は、大量に製袋するにあたり、Ｖ字形の切断片が散乱して包装製品に付着したり、作業環境を悪化させる問題がある。
【０００６】
そこで、本発明の目的は、易開封部による開封場所の限定が可能で、かつ、複雑な形状を有する包装袋、および、その製造方法を提供することにある。
【０００７】
【課題を解決するための手段】
請求項１の発明は、１枚又は２枚以上の積層フィルムを折り曲げ及び／又は重ね合わせ、端縁部を密封してなる包装袋であって、当該包装袋の開封を開始させるべき開封位置が、積層フィルム同士を貼り合わせて包装袋の端縁部に形成したシール部の外側端縁上の一部領域に限定されており、前記開封位置のシール部の外側端縁からシール部の幅方向の少なくとも途中までにかけて、積層フィルム中の少なくとも最も引き裂き強度が高いフィルム層の引き裂き強度を低下させた易開封部が設けられ、この易開封部は、前記積層フィルム中の最も引き裂き強度が高い層を含む２層以上に、貫通孔を含む粗面加工を施して形成されており、そのうちの一層には引き裂き強度を低下させた部分が前記易開封部の領域通りに形成されており、その他の層には引き裂き強度を低下させた部分が前記易開封部の領域を含むより広い領域に形成されていることを特徴とする。この発明によれば易開封部による開封位置を限定することができ、不必要に引き裂き強度の弱い部分を多く設けたり、袋の開封が製袋者の意図しない位置で行われて内容物がこぼれたり破損する虞がない。また、従来のように、製袋時に積層フィルムが折り曲げられる部分に易開封部を設けたのでは、包装袋の形状が積層フィルムを折り曲げることにより得られる形状に限定されてしまう。しかし、本発明のように、シール部に易開封部を設ければ、包装袋の形状を自由に選ぶことができる。そして、このようにすれば、引き裂き強度を低下させた部分が複数層にわたる場合に、引き裂き強度を低下させる位置の位置決め精度を抑えても期待する位置に正確に易開封部の領域を確保することができる。
【０００８】
請求項２の発明は、請求項１記載の易開封部が、シール部の外側端縁からシール部の幅方向に進むに従い先細りとなる形状を有していることを特徴とする。この場合には、開封者が開封しやすいようにシール部の外側端縁の開封位置にある程度の幅を持たせても、シール部を越えるまでに切り口を易開封部の先細りとなった場所に誘導できるので、さらに正確に開封位置を限定することができる。
【０００９】
請求項３の発明は、請求項１記載の前記積層フィルムは、少なくとも基材フィルム層と最内層であるシーラント層を有していることを特徴とする。この場合には、本発明を最も簡便な形態で実施することができる。
【００１０】
請求項４の発明は、請求項１記載の前記積層フィルムの少なくとも最も引き裂き強度が高い層の前記易開封部の領域に貫通孔を有する粗面加工が施され、さらに、当該積層フィルムは最内層であるシーラント層を有していることを特徴とする。この場合には、易開封部の領域に有する貫通孔の上にシーラント層が重なり、易開封部の領域に有する貫通孔を塞ぐので気密性を保つことができる。また、易開封部がシール部の位置からはみ出した場合でも気密性を保つことができる。
【００１２】
請求項５の発明は、請求項１記載の前記包装袋に関し、その上下方向の途中部分に首部を具備し、この包装袋の幅が底部から前記首部までの領域よりも前記首部の上側が狭くなるように、前記首部にてこの包装袋の側縁が曲線状に変化するよう形成され、前記易開封部は、前記首部又はこの首部よりも上側の領域における側縁に部分的に形成されていることを特徴とする。従来のように、直線的に連続した易開封部を設けて開封位置を形成する方法では、包装袋を横断又は縦断のように単純に通過しない複雑な形状を有するシール部に易開封部を設けようとすると、シール部以外の部分にも引き裂き強度を低下させた部分が形成されることとなる。この場合、開封位置が限定できないばかりでなく、包装袋のシール部以外の部分の強度を低下させることとなる。しかし、この発明によれば、複雑な形状や曲線形状を有するシール部に、開封位置を限定することが可能な易開封部を設けることができる。
【００１４】
請求項６の発明は、開封を開始させるべき開封位置が、積層フィルム同士を貼り合わせて包装袋の端縁部に形成したシール部の外側端縁上の一部領域に限定されており、前記開封位置のシール部の外側端縁からシール部の幅方向の少なくとも途中までにかけて、積層フィルム中の少なくとも最も引き裂き強度の高いフィルム層に引き裂き強度を低下させた易開封部が設けられている包装袋の製造方法であって、２以上のフィルムを準備し、そのうち一のフィルムに、前記易開封部の形状及び寸法に合わせてローラの外周面の一部に設けられた加工部材を押し当てて当該易開封部となる領域通りに引き裂き強度を低下させた部分を形成し、その他のフィルムに、引き裂き強度を低下させた部分を前記易開封部の領域を含むより広い領域に形成し、上記各フィルム及び必要に応じて他の層を、易開封部となる領域の位置を合わせ、任意の順序に積層して積層フィルムを作成し、このようにして作成した１枚又は２枚以上の積層フィルムを、折り曲げ及び／又は重ね合わせ、易開封部となる領域の位置を合わせ、端縁部のうち少なくとも開放端において当接し合う積層フィルムの端縁同士を貼り合わせて密封することを特徴とする。この発明によれば、請求項１に記載の包装袋を用意に実現することができる。
【００１５】
請求項７の発明は、請求項６に記載の前記包装袋に関し、その上下方向の途中部分に首部を具備し、この包装袋の幅が底部から前記首部までの領域よりも、前記首部の上側が狭くなるように前記首部にてこの包装袋の側縁が曲線状に変化するよう形成され、前記易開封部となる領域は、積層フィルムの外縁で、かつ、前記首部又はこの首部よりも上側の領域であって、前記積層フィルムを最終形態である包装袋の形状に合わせて裁断し、裁断した積層フィルムを折り曲げ及び／又は他のフィルムと重ね合わせて、端縁部を密封することを特徴とする。この発明によれば、請求項５に記載の包装袋を容易に実現することができる。
【００１６】
【発明の実施の形態】
図１は、本発明が適用された包装袋の一例を示す図である。この包装袋は、後述する積層フィルム２を２枚重ねて、その外周部分を接合することにより形成されている。積層フィルム２の接合箇所（シール部分）２ｃ上に、積層フィルム２の所定の層の引き裂き強度を低下させた粗面加工領域２ｂが設けられている。この包装袋は、粗面加工領域２ｂが設けられた部分（以下、「易開封部」とも呼ぶ。）のみから手指の力によって開封することが可能である。
【００１７】
図２は、積層フィルム２の断層図である。図２の（ａ）に示すように、積層フィルム２は主に、基材層４２、バリア層４３、シーラント層４４を有している。基材層４２は、積層フィルム２の基となる層であり、基材層４２に対して他の層が形成される。バリア層４３は、酸素や水蒸気などを透過させないためのガスバリア層であり、遮断する物資の種類や数に応じて複数の層が設けられる場合もある。シーラント層４４は、それ自身が溶融接着して積層フィルム２同士を接合して製袋するための層である。つまり、包装袋は２枚の積層フィルム２のシーラント層４４同士が内側に向けられた状態で接合される。接合の方法としては、熱溶着によるヒートシールが採用できる。ヒートシールの方法としては、通常のバーシール法の他に、超音波シール法や、高周波シール法がある。熱溶着の温度は、フィルムの種類、フィルムの厚さ、押付け圧、押付け時間などの条件により異なるが、１００〜２２０℃の範囲であり、一般に１５０〜１８０℃の程度で行われる。このシーラント層４４の原料としては、低密度ポリエチレンなどのオレフィン系樹脂、ポリエチレン−酢酸ビニル共重合体などが利用できる。基材層４２を形成する基材フィルム１は流通、保存に耐える強度を備えたものであればよく、ナイロン、ポリエステル、ポリプロピレン、または、これらの延伸フィルムが使用できる。これらの原料による基材フィルム１は強靭であるため引き裂き強度が高く、手指の力で切り口を作り引き裂き始めることができない。そこで、この基材フィルム１に強度の低い箇所を部分的に設ける（図２（ａ）の符号１ｂ参照）ことにより、手指の力のみで包装袋開封の切り口を作成できる易開封部２ｂを作成する。また、積層フィルム２の構成層に基材フィルム１以外にも引き裂き強度が高い層がある場合には、その層に対しても引き裂き強度の低い箇所を設ける加工を施すが、詳しくは後述する。一般的に、積層フィルムの中で基材フィルム１が最も引き裂き強度が高いが、基材フィルム１が紙などの引き裂き強度の低い材料で形成されている場合は、基材フィルム１に引き裂き強度を低下させた部分を設けず、最も引き裂き強度が高い層に優先的に引き裂き強度の低い部分を設け、必要に応じて他の引き裂き強度が高い層にも引き裂き強度の低い部分を設ける。積層フィルム２の具体的な構成としては、^*ＰＥＴ₁₂／ＰＥ₁₅／ＡＬ₇／ＰＥ₄₀、紙／ＰＥ／^*ＰＥＴ／ＰＥ／ＡＬ／ＰＥ、^*ＰＥＴ／^*ＯＮ／ＡＬ／ＰＥ、^*ＰＥＴ／ＡＬ／^*ＯＰＰ／ＰＥ、^*ＰＥＴ／ＰＥ／ＡＬ／ＰＥ／^*ＰＥフィルム、ＯＮ／ＡＬ／^*ＰＥＴ／ＰＥなどが考えられる。なお、上記の表示において、ＰＥＴはポリエチレンテレフタレート、ＰＥはポリエチレン、ＡＬはアルミ箔、ＯＮは延伸ナイロン、ＯＰＰは延伸ポリプロピレンをそれぞれ示し、粗面加工を施す層については頭に＊を付して示している。また、“／”は層間の区切りを、下付数字はミクロン単位の層の厚さを、それぞれ示す。
【００１８】
つぎに、易開封部２ｂの好ましい作成方法について説明する。基材フィルム１に対する加工方法に限定はなく、貫通孔を設けるもの、貫通しない孔を設けるもの、厚さの薄い箇所を部分的に設けるものなど、部分的にフィルムの強度を低下することができるものであればよい。基材フィルム１に貫通孔が設けられた場合にも、熱溶着時の熱により溶融したシーラント層４４が流れ込んで貫通孔を塞ぐため、さらに、図１に示すようにシール部分から易開封部がはみ出しても積層フィルム２の気密性およびバリア性が保たれる。また、基材フィルム１に対するこれらの加工を行う手段としてもとくに限定はない。一例としては図３に示すように、軸１０ａが固定されたローラ１０の外周面１０ｂの一部に、加工部材１１としてサンドペーパーを設けたものが利用できる。これに用いるサンドペーパーとしては、粒度５０〜２００番程度のもがよく、特に粒度８０番程度のものが好ましい。加工部材１１の形状及び寸法は、易開封部の形状・寸法に合わせてあり、この加工部材１１をフィルムに押し当てて粗面加工し、必要に応じてさらに裁断することにより、易開封部通りの形状、寸法を有する粗面部を形成し得る。
【００１９】
このローラ１０を図４に示すように、図示しない走行機構により保持されつつ走行する基材フィルム１に対して、軸１０ａを中心に回転可能となり、かつ、基材フィルムとの位置が調整可能となるように設ける。さらに、このように設けたローラ１０を所定の制御手段を用いて、加工部材１１の軸１０ａに対する周方向の位置、回転速度、基材フィルムとの位置を調整する。制御手段の指示により、ローラ１０が基材フィルム１の送り速度に合わせて回転しながら基材フィルム１の所定箇所に押圧する。ローラ１０に押圧された基材フィルム１は、ローラ１０と図示しない金属ロールとの間に挟まれる。これにより、ローラ１０の加工部材１１に設けられたサンドペーパーが基材フィルム１の表面に傷痕を形成し、粗面加工が施される。なお、基材フィルム１の粗面加工が施される場所は、製袋時に熱溶着などの手段により接合されるシール部分である。
【００２０】
加工部材１１は基材フィルム１の特定箇所の強度を低下させることができればよく、サンドペーパーを用いたものに限らない。例えば、金属製の加工部材１１の表面に複数の切刃や複数の錐状の突起を設けたけたものや、加工部材１１の表面に加熱部分を設けたものも適用できる。また、切刃や錐状の突起が加熱するようにしてもよい。また、図には、ローラ１０を一つだけ示したが、必要に応じて複数のローラ１０を設けてもよい。加工位置の決定方法としては、以下に説明する方法が可能である。図４に示すように、基材フィルム１に予めレジマーク１ａ…１ａを印刷しておく。ローラ１０のフィルム走行方向前方の所定の距離を隔てた場所には、レジマークセンサ（不図示）を設ける。レジマークセンサがレジマーク１ａを感知すると、コントローラに信号が送られ、コントローラが制御信号をサーボドライバーに送信する。サーボドライバーは制御信号に基づいてモータを回転させる。モータの回転により、ローラ１０の上下位置の調整および回転運動が行われる。これによれば、レジマーク１ａから所定の距離を隔てた場所に常に粗面加工１ｂが施される。
【００２１】
また、図２の（ｂ）に示すように、積層フィルムを形成するフィルムに、基材層４２（基材フィルム１）以外にも引き裂き強度が高い層４５が存在する場合には、このフィルムにも合わせて粗面加工を施す。図２の（ｂ）および（ｃ）に示すように、その粗面加工領域４５ａは、基材層４２の粗面加工領域１ｂよりも広く、基材層４２の粗面加工領域１ｂに重なるものである。つまり、包装フィルムの材料とする積層フィルムの２層以上のフィルムに対して粗面加工を施す場合には、各フィルムの粗面加工領域の重なり合った部分がもっとも引き裂き強度が低い領域、すなわち易開封部となる。２層以上のフィルムに対して粗面加工を施す場合には、いずれか一つの層を易開封部の領域通りに粗面加工し（例えば図２（ｂ）、（ｃ）の符号２ｂ）、それ以外の層は、易開封部となる領域を含むより広い領域（例えば図２（ｂ）、（ｃ）の符号１ｂ）を粗面加工することができる。このようにすれば、狭い粗面加工領域１ｂの位置は、広い粗面加工領域４５ａの範囲内であればよいため、粗面加工を施す場所の位置決め精度を抑えることができる。積層フィルムの２層以上のフィルムに対して粗面加工を施す場合には、最も引き裂き強度が高いフィルムを易開封部の領域通りに粗面加工することにより、易開封部とその周囲の引き裂き強度の差が大きくなり、また、易開封部の周囲の引き裂き強度の低下が少ないので、好ましい。なお、図１に示すように、粗面加工領域２ｂがシール領域２ｃの外にはみ出した場合にも、粗面加工を施した層が粗面加工を施さない他の層に挟まれているため気密性が確保される。ただし、図５に示すように、粗面加工領域２ｂはシール領域２ｃとなる箇所内に余裕をもって収まるように設けることが望ましい。
【００２２】
以上のようにして粗面加工１ｂが施された基材フィルム１に他のフィルム層が形成されて積層フィルム２が作られる。この積層フィルム２を所定の形状に切断し、内容物を収容すると共に所定の箇所を熱溶着によりシールすることにより包装袋が完成する。粗面加工領域２ｂの形状は、図６に示すようにシール領域２ｃの外側端縁からシール領域２ｃの幅方向に進むに連れて、すなわち、開封方向に進むに連れて先細りとなる形状にするとよい。このようにすれば、易開封部の切出し位置に幅を持たせることができるので開封者が容易に易開封部から切出すことができる。また、粗面加工が先細り状に施されているので、シール領域２ｃを越えるまでに切り口を粗面加工の先細りとなった先端部分に誘導して開封位置をさらに正確に限定することができる。このような先細り状の易開封部は、これに対応する先細り形状の加工部材をフィルムに押し当てることによって形成できる。
【００２３】
つぎに、積層フィルムから包装袋を製袋する方法を説明する。
【００２４】
図７および図８は、一般的な四角形状の包装袋を製袋する過程を示す図である。複雑な形状を有する袋に先立って、一般的な四角形状を有する包装袋の製造について説明する。図７は、粗面加工の際に、積層フィルム２の幅方向にローラ１０で断続的に加工が施され、袋への内容物の封入に際して、一袋毎にシリアルに内容物を封入する製造手順を示している。図８は、粗面加工の際に、積層フィルム２の長手方向に断続的にローラ１０で加工が施され、袋への内容物の封入に際して、複数の袋に一括してパラレルに内容物を封入する製造手順を示している。包装袋の最終的な仕上がりの違いから、以下これらを「シリアルの製法」および「パラレルの製法」とそれぞれ呼ぶ。なお、両図の（ａ）中の矢印Ｒはフィルムの走方向を、矢印Ｃは製袋時の折り畳みの方向をそれぞれ示している。また、斜線を施した部分は基材フィルム１に粗面加工１ｂを施した粗面加工領域２ｂを示しており、製袋後に易開封部となる場所である。積層フィルム２は矢印Ｃの方向に折りたたまれ、両図の（ｂ）に示すようになる。この時、折りたたむ軸に対して対称となる位置にある粗面加工領域２ｂ，２ｂが互いに重なるようになっている。なお、この例では、後述するように、折りたたまれることにより形成される端縁にも易開封部が形成され、当該位置にも熱溶着が施される。この時、折りたたみ軸上の粗面加工領域２ｂが熱溶着領域に含まれる。さらに、両図の（ｃ）に示すように、内容物の封入口を残して、袋となる部分の３方、つまり、斜線を施した部分が熱溶着される。図７のシリアルの製法の場合は、まず、連続する袋のうちの先頭の袋４に内容物が入れられる。つぎに、封入口４ａが熱溶着により閉じられる。その後、袋４の後ろ側が、断線IV−IVでカットされることにより図１に示す包装袋ができ上がる。袋４に対するカット位置に余裕を持たせることにより、先頭の袋に溶着されないスカート部４ｂが残り、つぎの袋の封入口が確実に形成される。これを繰り返すことにより包装袋が一つずつ作成される。パラレル手順の製法の場合は、連なる袋５に一括して内容物が入れられる。つぎに、直線状に並んだ封入口５ａが一度に熱溶着される。最後に、袋間が断線V−Vでカットされて一度に複数の包装袋ができ上がる。
【００２５】
図９から図１３は、複雑な形状を有する包装袋の熱溶着部に易開封部を設けた例である。これは、ボトル型包装袋３０でありボトル底から首部３３までガセットを有し、その首部３３に易開封部３３ａ…３３ａを備えている。従来のように、積層フィルム２が折り曲げられる場所に、部分的な易開封部を設ける方法では、このような複雑な形状をもつ包装袋に易開封部を設けることはできない。すなわち、積層フィルム２の折り曲げ加工によっては、ボトル型包装袋３０の様な形状の形成は不可能である。また、従来の技術では、ローラの側面全体に粗面加工を施すための加工部材を設け、積層フィルム２に対してこのローラを連続的にかけていた。そのため、連続的で直線的な粗面加工領域しか得ることができなかった。曲線などの複雑な形状に合わせてローラをかけることは、技術的に非常に困難である。したがって、図１４に示すように、粗面加工を施したい領域６１が端縁Ａ上に有り、端縁Ａの形状が、端縁Ａの開封位置の延長線がヒートシールが施される端縁以外の部分を通過するような複雑な場合、従来の技術では符号６２にて示す直線領域全体に粗面加工を施してしまう。これでは、製袋時の易開封部の位置を限定することができないばかりか、包装袋の製品強度を不用意に低下させてしまう。以下に示す方法による包装袋は、複雑な形状を持つにもかかわらず、易開封部による開封位置の限定が可能である。
【００２６】
図１０に示すように、このボトル型包装袋３０は、本体部３１，３１と、ガセット部３２，３２とを有している。本体部３１，３１およびガセット部３２，３２は、図１０の（ａ），（ｂ）に示す形状を有する積層フィルム２の切片を熱溶着することにより形成される。本体部３１，３１およびガセット部３２，３２は、首部３３となる幅狭部３１ａ，３２ａの両側縁に粗面加工が施された粗面加工領域３１ｂ，３１ｂ，３２ｂ，３２ｂをそれぞれ有している。
【００２７】
本体部３１は、図１１に示すように、幅狭部３１ａとなる場所に予め粗面加工を施した粗面加工領域３１ｂ…３１ｂを有する積層フィルム２を図中に実線で示す型に切り抜くことにより形成される。なお、粗面加工は積層フィルム２の最も引き裂き強度が高い基材層４２に対して行われ、他にも引き裂き強度が高い層４５がある場合にはこの層に対しても粗面加工が行われる。同様に、ガセット部３２は、予め粗面加工領域３２ｂ…３２ｂを有する積層フィルム２を図１２中に実線で示す型に切り抜くことにより形成される。
【００２８】
つぎに、ガセット部３２，３２が、中央部（図１０の（ｂ）に破線で示す位置）で左右二つ折りされる。図１３に示すように、二つ折りされたガセット部３２，３２を本体部３１，３１で挟み込む。ガセット部３２，３２の縁と、本体部３１，３１の縁と（図９中に符号３０ａで示す斜線領域）が熱溶着により接合される。なお、この段階では、上端開口部３４は密封されない。このとき、本体部３１の粗面加工領域３１ｂとガセット部３２の粗面加工領域３２ｂとがそれぞれ重なり合うように形成されており、粗面加工領域３１ｂと粗面加工領域３２ｂとの接合により、易開封部３３ａが形成される。
【００２９】
つぎに、ガセット部３２，３２を開いて、ボトル型包装袋３０の底を箱形に成型する（図９参照）。その後、ボトル型包装袋３０内部に液体洗剤などの液体が主に充填され、最後に、上端開口部３４が熱溶着により接合される。こうして作られたボトル型包装袋３０は、開封に際して易開封部３３ａ…３３ａから手指の力のみで容易に切り口を開いて開封することが可能となる。
【００３０】
【発明の効果】
以上に説明したように、本発明の包装袋は、開封場所が限定されており、かつ、自由度の高い形状を有することができる。また、本発明の包装袋の製造方法によればこのような包装袋を容易に得ることができる。
【図面の簡単な説明】
【図１】本発明が適用され、図６または図７の製造過程で作成された四角形状の包装袋を示す平面図。
【図２】本発明が適用された積層フィルムの断面の断面図で、（ａ）は、基材フィルムのみに易開封部作成のための粗面加工を施した積層フィルムの断面図、（ｂ）は、基材層の他に引き裂き強度が高い層に対しても加工を施した積層フィルムの断面図、（ｃ）は、（ｂ）の積層フィルムの平面図。
【図３】基材フィルムに易開封部作成のための粗面加工を施すローラを示す斜視図。
【図４】ローラを用いて基材フィルムに粗面加工を施す様子を示す斜視図。
【図５】図１における、Ｖ部の拡大図。
【図６】図１における、Ｖ部の拡大図。
【図７】積層フィルムから四角形状の包装袋を製造するに際しての積層フィルムの加工過程を示す図で、（ａ）は、積層フィルムから切出された積層フィルムを示す平面図、（ｂ）は、折りたたまれた積層フィルムを示す平面図、（ｃ）は内容物の封入口を残して熱用着された積層フィルムを示す平面図。
【図８】積層フィルムから四角形状の包装袋を製造するに際しての、積層フィルムの加工過程を示す図で、（ａ）は、積層フィルムから切出された積層フィルムを示す平面図、（ｂ）は、折りたたまれた積層フィルムを示す平面図、（ｃ）は内容物の封入口を残して熱用着された積層フィルムを示す平面図。
【図９】本発明が適用されたボトル型の包装袋を示す斜視図。
【図１０】図７のボトル型の包装袋を構成する積層フィルムの切片を示す図で、（ａ）は、本体部の積層フィルム切片を示す平面図、（ｂ）は、ガセット部の積層フィルム切片を示す平面図。
【図１１】ボトル型包装袋の本体部を積層フィルムから切り抜く様子を示す平面図。
【図１２】ボトル型包装袋のガセット部を積層フィルムから切り抜く様子を示す平面図。
【図１３】二つ折りしたガセット部を本体部で挟んで、ボトル型包装袋を形成する様子を示す斜視図。
【図１４】従来の技術で、本体部に粗面加工を施したときの様子を示す平面図。
【符号の説明】
１基材フィルム
１ａレジマーク
１ｂ粗面加工（粗面加工領域）
２積層フィルム
２ｂ易開封部
２ｃ接合箇所（シール部）
２ｂ粗面加工領域
４ｂスカート部
２ｂ，２ｂ粗面加工領域
４，５袋
４ａ，５ａ封入口
１０ローラ
１０ａ軸
１０ｂ外周面
１１加工部材
３０ボトル型包装袋
３１本体部
３１ａ幅狭部
３１ｂ粗面加工領域
３２ガセット部
３２ａ幅狭部
３２ｂ粗面加工領域
３３首部
３３ａ易開封部
３４上端開口部
４２基材層（基材フィルム）
４３バリア層
４４シーラント層
４５引き裂き強度が高い層
４５ａ粗面加工領域[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a packaging bag having an easy-opening portion that can be opened with the force of a finger without impairing the practical strength of the bag, and a method for manufacturing the same.
[0002]
[Prior art]
There are laminated film packaging bags that divide and store commodities such as food, drugs, and accessories. When opening the packaging bag, since it is time-consuming to prepare the blade, it is desirable that it can be easily opened only with fingers. For this purpose, there are a bag provided with a notch at the edge or a roughened surface (scratch mark). Concerning the latter, the surface of the bag that is formed by folding the laminated film in half is processed with a rough surface, and the heat seal portion of the bag is continuously in contact with a roller with abrasive material on the roller surface. Thus, it is known that a straight and continuous rough surface region is formed over the entire length of the heat seal portion (see Japanese Patent Publication No. 61-39228).
[0003]
[Problems to be solved by the invention]
Examples of the contents contained in the sealed sachet include chemicals and thin sheet foods. In these cases, the contents may spill or be damaged depending on the opening location. For this reason, the request | requirement of limiting the place which can be opened arises. Further, this type of sealed pouch is mainly rectangular, but it is desirable that its shape can be changed according to the contents and the needs of the user.
[0004]
However, when the rough surface processing method disclosed in the above Japanese Patent Publication No. 61-39228 is used, a continuous rough surface region can only be continuously formed along the linear seal portion at the bag edge. Therefore, the opening place cannot be limited. In addition, when the bag edge has a complicated or curved shape, the sealing portion of the edge cannot be roughened. In the former case, the shape is limited to a shape that can be produced by folding the film.
[0005]
When providing a notch in a bag body, the opening place of the said bag body is limited to the place which formed the notch. When a packaging bag is manufactured by a packaging material processing manufacturer and delivered to a user, the packaging bag processing manufacturer performs notch processing on the heat seal part of the packaging bag at the stage of forming the packaging bag. However, if the packaging material processing manufacturer delivers the rolled packaging material material to the user and forms the packaging bag while filling the content with the user's content filling machine, It is difficult to notch the heat seal part. In addition, when the I notch is provided, it is difficult to find where the cut edge is provided at the edge of the bag. When the V notch is provided, V-shaped cut pieces are scattered when making a large amount of bags. There is a problem of adhering to the packaged product or deteriorating the working environment.
[0006]
Accordingly, an object of the present invention is to provide a packaging bag having a complicated shape and a manufacturing method thereof that can limit the opening location by the easy opening portion.
[0007]
[Means for Solving the Problems]
  The invention of claim 1 is a packaging bag in which one or two or more laminated films are folded and / or overlapped and the end edge portion is sealed, and an opening position at which opening of the packaging bag is to be started is provided. The laminated film is bonded to each other and is limited to a partial region on the outer edge of the seal part formed at the edge of the packaging bag, and the width direction of the seal part from the outer edge of the seal part at the opening position The easy-open portion that has reduced the tear strength of the film layer having the highest tear strength in the laminated film at least partway throughThe easy-opening portion is provided with a rough surface processing including through holes on two or more layers including the layer having the highest tear strength in the laminated film.Formed,One of the layers has a portion with reduced tear strength formed in the area of the easy-open portion, and the other layer has a wider area with the portion with reduced tear strength including the easy-open portion. Formed intoIt is characterized by. According to the present invention, the opening position by the easy-opening portion can be limited. Unnecessarily many portions with weak tearing strength are provided, or the opening of the bag is performed at a position unintended by the bag-maker. There is no risk of damage. Moreover, if the easy-opening part is provided in the portion where the laminated film is folded during bag making as in the conventional art, the shape of the packaging bag is limited to the shape obtained by folding the laminated film. However, the shape of the packaging bag can be freely selected by providing an easy-open portion in the seal portion as in the present invention.And, in this way, when the portion where the tear strength is reduced covers a plurality of layers, the area of the easy-opening portion can be accurately secured at the expected position even if the positioning accuracy of the position where the tear strength is reduced is suppressed. Can do.
[0008]
The invention according to claim 2 is characterized in that the easy-opening portion according to claim 1 has a shape that tapers from the outer edge of the seal portion in the width direction of the seal portion. In this case, even if the opening position of the outer edge of the seal part is given a certain width so that it can be easily opened by the opener, the cut end is tapered to the place where the easy-open part is tapered before the seal part is exceeded. Since it can be guided, the opening position can be more accurately limited.
[0009]
The invention of claim 3 is characterized in that the laminated film of claim 1 has at least a base film layer and a sealant layer which is an innermost layer. In this case, the present invention can be implemented in the simplest form.
[0010]
According to a fourth aspect of the present invention, the laminated film according to the first aspect is subjected to a rough surface process having a through hole in the region of the easy-opening portion of at least the layer having the highest tear strength, and the laminated film is an innermost layer. It has the sealant layer which is. In this case, the sealant layer is overlapped on the through hole provided in the region of the easy-opening portion, and the through-hole provided in the region of the easy-opening portion is closed, so that airtightness can be maintained. Further, even when the easy-open portion protrudes from the position of the seal portion, the airtightness can be maintained.
[0012]
  The invention according to claim 5 is the invention according to claim 1.With respect to the packaging bag, a neck portion is provided at a middle portion in the vertical direction, and the width of the packaging bag is narrower on the upper side of the neck portion than the region from the bottom portion to the neck portion. A side edge is formed so as to change in a curved shape, and the easy-opening part is partially formed on a side edge in the neck part or a region above the neck part.It is characterized by that. In the conventional method of forming an opening position by providing linearly continuous easy-opening portions, an easy-opening portion is provided in a sealing portion having a complicated shape that does not simply pass through a packaging bag, such as a transverse or longitudinal section. If it does so, the part which reduced tearing strength will be formed also in parts other than a seal part. In this case, not only can the opening position be limited, but also the strength of the portion other than the seal portion of the packaging bag is reduced. However, according to this invention, the easy opening part which can limit an opening position can be provided in the seal part which has a complicated shape or a curve shape.
[0014]
  Claim 6In the invention, the opening position at which opening is to be started is limited to a partial region on the outer edge of the seal part formed by bonding the laminated films to the edge part of the packaging bag. A method for manufacturing a packaging bag in which an easy-open portion with reduced tear strength is provided on at least the highest tear strength film layer in a laminated film from the outer edge of the seal portion to at least halfway in the width direction of the seal portion Two or more films are prepared, and one of the films is pressed against a processing member provided on a part of the outer peripheral surface of the roller in accordance with the shape and size of the easy-opening part. Forming a portion with reduced tear strength according to the region to be formed, and forming a portion with reduced tear strength in a wider region including the region of the easy-open portion in the other films, One or two or more laminated films prepared in this manner are prepared by aligning the positions of the film and other layers as necessary, with the positions of the regions to be easily opened, and laminating them in an arbitrary order. Are folded and / or overlapped, the position of the region to be the easy-opening portion is aligned, and the edge of the laminated film that abuts at least at the open end among the edge portions is bonded and sealed. According to this invention,Claim 1It is possible to realize the packaging bag described in 1. above.
[0015]
  The invention according to claim 7 is the invention according to claim 6.With respect to the packaging bag, a neck portion is provided at an intermediate portion in the vertical direction, and the width of the packaging bag is narrower on the upper side of the neck portion than the region from the bottom portion to the neck portion. The side edges are formed to change in a curved shape,The region to be the easy-opening portion is the outer edge of the laminated filmAnd the neck or the region above the neck,The laminated film is cut in accordance with the shape of the packaging bag as the final form, and the cut laminated film is folded and / or overlapped with another film to seal the edge portion. According to this invention, the packaging bag according to claim 5 can be easily realized.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a diagram showing an example of a packaging bag to which the present invention is applied. This packaging bag is formed by stacking two laminated films 2 to be described later and joining the outer peripheral portions thereof. A roughened surface region 2b in which the tear strength of a predetermined layer of the laminated film 2 is reduced is provided on a joining portion (seal portion) 2c of the laminated film 2. This packaging bag can be opened by the force of fingers only from the portion where the roughened region 2b is provided (hereinafter also referred to as “easy-opening portion”).
[0017]
FIG. 2 is a tomogram of the laminated film 2. As shown in FIG. 2A, the laminated film 2 mainly has a base material layer 42, a barrier layer 43, and a sealant layer 44. The base material layer 42 is a layer that is a base of the laminated film 2, and other layers are formed on the base material layer 42. The barrier layer 43 is a gas barrier layer that prevents oxygen or water vapor from permeating, and a plurality of layers may be provided depending on the type and number of materials to be blocked. The sealant layer 44 is a layer for melt-bonding itself to join the laminated films 2 to form a bag. That is, the packaging bag is joined in a state where the sealant layers 44 of the two laminated films 2 are directed inward. As a joining method, heat sealing by heat welding can be employed. As a heat sealing method, there are an ultrasonic sealing method and a high frequency sealing method in addition to a normal bar sealing method. Although the temperature of heat welding changes with conditions, such as a kind of film, a film thickness, pressing pressure, and pressing time, it is the range of 100-220 degreeC, and is generally performed at about 150-180 degreeC. As a raw material of the sealant layer 44, an olefin resin such as low density polyethylene, a polyethylene-vinyl acetate copolymer, or the like can be used. The base film 1 that forms the base layer 42 may be any film having strength enough to withstand distribution and storage, and nylon, polyester, polypropylene, or a stretched film thereof can be used. Since the base film 1 made of these raw materials is tough, the tear strength is high, and it is impossible to start tearing with a finger. Therefore, an easy-opening portion 2b that can create an opening for opening the packaging bag with only the force of fingers is created by partially providing a low-strength portion on the base film 1 (see reference numeral 1b in FIG. 2A). To do. In addition, when the constituent layer of the laminated film 2 includes a layer having a high tear strength in addition to the base film 1, a process for providing a portion having a low tear strength is also applied to the layer, which will be described in detail later. Generally, the base film 1 has the highest tear strength among the laminated films, but when the base film 1 is formed of a material having a low tear strength such as paper, the base film 1 has a tear strength. A portion having a low tear strength is preferentially provided in a layer having the highest tear strength without providing a reduced portion, and a portion having a low tear strength is also provided in another layer having a high tear strength as necessary. As a specific configuration of the laminated film 2,^*PET₁₂/ PE₁₅/ AL₇/ PE₄₀, Paper / PE /^*PET / PE / AL / PE,^*PET /^*ON / AL / PE,^*PET / AL /^*OPP / PE,^*PET / PE / AL / PE /^*PE film, ON / AL /^*PET / PE can be considered. In the above display, PET represents polyethylene terephthalate, PE represents polyethylene, AL represents aluminum foil, ON represents stretched nylon, OPP represents stretched polypropylene, and the layer to be roughened is indicated with a head *. ing. In addition, “/” indicates the separation between layers, and the subscript indicates the thickness of the layer in units of microns.
[0018]
Next, a preferred method for creating the easy-open portion 2b will be described. There is no limitation on the processing method for the base film 1, and the strength of the film can be partially reduced, such as providing a through hole, providing a hole that does not penetrate, or partially providing a thin portion. Anything is acceptable. Even when the base film 1 is provided with a through hole, the sealant layer 44 melted by the heat at the time of heat welding flows in to close the through hole. Even if it protrudes, the airtightness and barrier property of the laminated film 2 are maintained. Moreover, there is no limitation in particular also as a means to perform these processes with respect to the base film 1. FIG. As an example, as shown in FIG. 3, a member provided with sandpaper as a processing member 11 on a part of the outer peripheral surface 10 b of the roller 10 to which the shaft 10 a is fixed can be used. The sandpaper used for this purpose should have a particle size of about 50 to 200, with a particle size of about 80 being particularly preferred. The shape and size of the processed member 11 are matched to the shape and size of the easy-open portion, and the processed member 11 is pressed against the film to roughen the surface, and further cut as necessary. A rough surface portion having the following shape and size can be formed.
[0019]
As shown in FIG. 4, the roller 10 can be rotated around the shaft 10 a with respect to the base film 1 that travels while being held by a travel mechanism (not shown), and the position of the roller 10 can be adjusted. Provide to be. Furthermore, the roller 10 provided in this way is adjusted by using a predetermined control means to adjust the position of the processed member 11 in the circumferential direction relative to the shaft 10a, the rotational speed, and the position of the base film. In accordance with an instruction from the control means, the roller 10 presses against a predetermined portion of the base film 1 while rotating in accordance with the feed speed of the base film 1. The base film 1 pressed by the roller 10 is sandwiched between the roller 10 and a metal roll (not shown). Thereby, the sandpaper provided on the processing member 11 of the roller 10 forms a scar on the surface of the base film 1 and is subjected to roughening. In addition, the place where the rough surface processing of the base film 1 is performed is a seal portion that is joined by means such as heat welding at the time of bag making.
[0020]
The process member 11 should just be able to reduce the intensity | strength of the specific location of the base film 1, and is not restricted to what used the sandpaper. For example, it is also possible to apply a metal processing member 11 having a plurality of cutting blades and a plurality of cone-shaped projections on the surface, or a processing member 11 having a heating portion on the surface. Moreover, you may make it a cutting blade and a cone-shaped protrusion heat. Although only one roller 10 is shown in the figure, a plurality of rollers 10 may be provided as necessary. As a method for determining the processing position, the method described below is possible. As shown in FIG. 4, registration marks 1a... 1a are printed on the base film 1 in advance. A registration mark sensor (not shown) is provided at a predetermined distance in front of the roller 10 in the film running direction. When the registration mark sensor detects the registration mark 1a, a signal is sent to the controller, and the controller sends a control signal to the servo driver. The servo driver rotates the motor based on the control signal. Adjustment of the vertical position of the roller 10 and rotational movement are performed by the rotation of the motor. According to this, the rough surface processing 1b is always performed at a location spaced a predetermined distance from the registration mark 1a.
[0021]
In addition, as shown in FIG. 2 (b), when the film forming the laminated film includes a layer 45 having a high tear strength in addition to the base layer 42 (base film 1), In addition, the rough surface is processed. As shown in FIGS. 2B and 2C, the rough surface processing region 45 a is wider than the rough surface processing region 1 b of the base material layer 42 and overlaps the rough surface processing region 1 b of the base material layer 42. It is. That is, when two or more layers of a laminated film as a packaging film material are roughened, the overlapping portion of the roughened regions of each film is the region with the lowest tear strength, that is, easy opening. Part. When roughening the surface of two or more layers, any one layer is roughened according to the region of the easy-open portion (for example, reference numerals 2b in FIGS. 2 (b) and (c)), Other layers can roughen a wider area (for example, reference numeral 1b in FIGS. 2B and 2C) including an area that becomes an easy-open portion. In this way, since the position of the narrow rough surface processing region 1b only needs to be within the range of the wide rough surface processing region 45a, the positioning accuracy of the place where the rough surface processing is performed can be suppressed. When roughing the film of two or more layers of the laminated film, the tear strength of the easy-opening part and its surroundings is achieved by roughing the film with the highest tearing strength according to the area of the easy-opening part. This is preferable because the difference between the two is large, and the tear strength around the easy-open portion is hardly reduced. Note that, as shown in FIG. 1, even when the rough surface processing region 2b protrudes outside the seal region 2c, the layer subjected to the rough surface processing is sandwiched between other layers not subjected to the rough surface processing. Airtightness is ensured. However, as shown in FIG. 5, it is desirable to provide the roughened surface processing region 2b so as to fit within the portion that becomes the sealing region 2c with a margin.
[0022]
As described above, another film layer is formed on the base film 1 on which the rough surface processing 1b has been performed, whereby the laminated film 2 is produced. The laminated film 2 is cut into a predetermined shape, the contents are accommodated, and a predetermined portion is sealed by heat welding to complete a packaging bag. As shown in FIG. 6, the roughened region 2 b has a shape that tapers from the outer edge of the seal region 2 c in the width direction of the seal region 2 c, that is, as it advances in the opening direction. Good. If it does in this way, since the width | variety can be given to the cutting position of an easy-opening part, an opener can cut out from an easy-opening part easily. Further, since the rough surface processing is performed in a tapered shape, the opening position can be more accurately limited by guiding the cut end to the tapered tip portion of the rough surface processing before exceeding the seal region 2c. Such a taper-shaped easy-opening part can be formed by pressing the taper-shaped processed member corresponding to this on a film.
[0023]
Next, a method for making a packaging bag from a laminated film will be described.
[0024]
7 and 8 are diagrams showing a process of making a general rectangular packaging bag. Prior to a bag having a complicated shape, the production of a packaging bag having a general rectangular shape will be described. FIG. 7 shows a manufacturing in which the processing is intermittently performed by the roller 10 in the width direction of the laminated film 2 during the rough surface processing, and the contents are serially sealed for each bag when the contents are sealed in the bag. The procedure is shown. FIG. 8 shows that the surface of the laminated film 2 is intermittently processed by the roller 10 during the rough surface processing, and when the contents are enclosed in the bag, the contents are collectively put in a plurality of bags in parallel. The manufacturing procedure to enclose is shown. Due to the difference in the final finish of the packaging bag, these are hereinafter referred to as “serial manufacturing method” and “parallel manufacturing method”, respectively. In both figures, the arrow R in (a) indicates the film running direction, and the arrow C indicates the folding direction during bag making. Moreover, the part which gave the oblique line has shown the rough surface process area | region 2b which gave the rough surface process 1b to the base film 1, and is a place used as an easy-opening part after bag making. The laminated film 2 is folded in the direction of arrow C, as shown in FIG. At this time, the rough surface processing regions 2b and 2b located at positions symmetrical with respect to the folding axis are overlapped with each other. In this example, as will be described later, an easy-open portion is formed on an edge formed by folding, and thermal welding is also applied to the position. At this time, the rough surface processing region 2b on the folding shaft is included in the heat welding region. Further, as shown in both figures (c), the three portions of the portion that becomes the bag, that is, the hatched portion, are thermally welded while leaving the contents sealing port. In the case of the serial manufacturing method of FIG. 7, first, the contents are put in the top bag 4 of the continuous bags. Next, the sealing port 4a is closed by heat welding. Thereafter, the rear side of the bag 4 is cut at the disconnection IV-IV, thereby completing the packaging bag shown in FIG. By giving a margin to the cutting position with respect to the bag 4, the skirt portion 4b that is not welded to the leading bag remains, and the sealing port of the next bag is reliably formed. By repeating this, one packaging bag is created. In the case of a parallel procedure, the contents are put together in a continuous bag 5. Next, the sealing ports 5a arranged in a straight line are thermally welded at a time. Finally, the gap between the bags is cut at the disconnection V-V, and a plurality of packaging bags are completed at one time.
[0025]
9 to 13 are examples in which an easy-opening portion is provided in the heat-welded portion of a packaging bag having a complicated shape. This is a bottle-type packaging bag 30, which has a gusset from the bottom of the bottle to the neck 33, and the neck 33 is provided with easy opening portions 33a ... 33a. The conventional method of providing a partial easy opening portion where the laminated film 2 is bent cannot provide the easy opening portion in a packaging bag having such a complicated shape. That is, depending on the bending process of the laminated film 2, it is impossible to form a shape like the bottle-type packaging bag 30. Further, in the conventional technique, a processing member for roughing the entire side surface of the roller is provided, and this roller is continuously applied to the laminated film 2. Therefore, only a continuous and linear rough surface processing region could be obtained. It is technically difficult to apply a roller to a complicated shape such as a curve. Therefore, as shown in FIG. 14, there is an area 61 on the edge A where the rough surface processing is desired, and the edge A has an edge where the extension line of the opening position of the edge A is heat-sealed. In the case of a complicated case passing through a portion other than the above, in the conventional technique, the entire straight region indicated by reference numeral 62 is roughened. In this case, not only can the position of the easy-open portion at the time of bag making be limited, but also the product strength of the packaging bag will be inadvertently reduced. Although the packaging bag by the method shown below has a complicated shape, the opening position by the easy opening portion can be limited.
[0026]
As shown in FIG. 10, the bottle-type packaging bag 30 includes main body portions 31 and 31 and gusset portions 32 and 32. The main body portions 31 and 31 and the gusset portions 32 and 32 are formed by heat-welding sections of the laminated film 2 having the shapes shown in FIGS. The main body portions 31 and 31 and the gusset portions 32 and 32 have rough surface processed regions 31b, 31b, 32b, and 32b, respectively, in which rough surface processing is performed on both side edges of the narrow portions 31a and 32a that become the neck portion 33. Yes.
[0027]
As shown in FIG. 11, the main body 31 cuts out the laminated film 2 having rough surface processed areas 31b... 31b that have been previously roughened in a place to become the narrow part 31a into a mold indicated by a solid line in the drawing. It is formed by. The rough surface processing is performed on the base material layer 42 having the highest tear strength of the laminated film 2, and when there is another layer 45 having a high tear strength, the rough surface processing is also performed on this layer. Is called. Similarly, the gusset portion 32 is formed by cutting out the laminated film 2 having the rough surface processed regions 32b... 32b in advance into a mold indicated by a solid line in FIG.
[0028]
Next, the gusset parts 32 and 32 are folded in half at the center (the position indicated by the broken line in FIG. 10B). As shown in FIG. 13, the gusset portions 32, 32 folded in half are sandwiched between the main body portions 31, 31. The edges of the gusset parts 32 and 32 and the edges of the main body parts 31 and 31 (shaded area indicated by reference numeral 30a in FIG. 9) are joined by thermal welding. At this stage, the upper end opening 34 is not sealed. At this time, the rough surface processing region 31b of the main body 31 and the rough surface processing region 32b of the gusset portion 32 are formed so as to overlap each other, and by joining the rough surface processing region 31b and the rough surface processing region 32b, it is easy. An opening portion 33a is formed.
[0029]
Next, the gusset parts 32 and 32 are opened, and the bottom of the bottle-type packaging bag 30 is molded into a box shape (see FIG. 9). Thereafter, the bottle-shaped packaging bag 30 is mainly filled with a liquid such as a liquid detergent, and finally, the upper end opening 34 is joined by thermal welding. The bottle-shaped packaging bag 30 made in this way can be opened easily by opening the cut from the easy-opening portions 33a.
[0030]
【The invention's effect】
As described above, the packaging bag of the present invention has a limited opening location and can have a shape with a high degree of freedom. Moreover, according to the manufacturing method of the packaging bag of this invention, such a packaging bag can be obtained easily.
[Brief description of the drawings]
FIG. 1 is a plan view showing a rectangular packaging bag to which the present invention is applied and created in the manufacturing process of FIG. 6 or FIG.
FIG. 2 is a cross-sectional view of a cross-section of a laminated film to which the present invention is applied, wherein (a) is a cross-sectional view of the laminated film obtained by subjecting only the base film to a rough surface processing for making an easy-open portion; ) Is a cross-sectional view of a laminated film obtained by processing a layer having a high tear strength in addition to the base material layer, and (c) is a plan view of the laminated film of (b).
FIG. 3 is a perspective view showing a roller for roughening a base film for creating an easy-open portion.
FIG. 4 is a perspective view showing a state in which a base film is roughened using a roller.
FIG. 5 is an enlarged view of a portion V in FIG. 1;
6 is an enlarged view of a V portion in FIG. 1. FIG.
FIGS. 7A and 7B are diagrams showing a process of processing a laminated film when manufacturing a rectangular packaging bag from the laminated film, wherein FIG. 7A is a plan view showing the laminated film cut out from the laminated film, and FIG. The top view which shows the folded laminated film, (c) The top view which shows the laminated | multilayer film heat-applied leaving the enclosure port of the contents.
FIG. 8 is a view showing a process of processing a laminated film when manufacturing a rectangular packaging bag from the laminated film, wherein (a) is a plan view showing the laminated film cut out from the laminated film; FIG. 3 is a plan view showing a folded laminated film, and FIG. 3C is a plan view showing the laminated film that is heat-fitted with the contents sealed in.
FIG. 9 is a perspective view showing a bottle-type packaging bag to which the present invention is applied.
10 is a view showing a section of the laminated film constituting the bottle-shaped packaging bag of FIG. 7, wherein (a) is a plan view showing the laminated film section of the main body, and (b) is a laminated film of the gusset section. The top view which shows a section | slice.
FIG. 11 is a plan view showing a state in which the main body of the bottle-type packaging bag is cut out from the laminated film.
FIG. 12 is a plan view showing a state in which a gusset portion of a bottle-type packaging bag is cut out from a laminated film.
FIG. 13 is a perspective view showing a state in which a bottle-shaped packaging bag is formed by sandwiching a folded gusset part between main body parts.
FIG. 14 is a plan view showing a state in which the main body is roughened by a conventional technique.
[Explanation of symbols]
1 Base film
1a cash register mark
1b Roughening (Roughening area)
2 Laminated film
2b Easy opening part
2c Joint location (seal part)
2b Rough surface machining area
4b Skirt
2b, 2b Rough surface machining area
4,5 bags
4a, 5a enclosure port
10 Laura
10a axis
10b Outer peripheral surface
11 Processing parts
30 Bottle-type packaging bag
31 Body
31a Narrow part
31b Rough surface machining area
32 Gusset Club
32a Narrow part
32b Rough surface machining area
33 neck
33a Easy opening part
34 Upper end opening
42 Base material layer (base material film)
43 Barrier layer
44 Sealant layer
45 Layer with high tear strength
45a Rough surface machining area

Claims

A packaging bag in which one or two or more laminated films are folded and / or overlapped, and an edge is sealed,
The opening position where the opening of the packaging bag should be started is limited to a partial region on the outer edge of the seal part formed by bonding the laminated films to the edge of the packaging bag,
An easy-opening portion with reduced tearing strength is provided from the outer edge of the seal portion at the opening position to at least halfway in the width direction of the seal portion,
This easy-opening portion is formed by subjecting two or more layers including a layer having the highest tear strength in the laminated film to a rough surface processing including a through hole,
In one of them, the portion where the tear strength is reduced is formed according to the region of the easy-opening portion,
In the other layer, the packaging bag is characterized in that a portion where the tear strength is reduced is formed in a wider area including the area of the easy opening portion.

The packaging bag according to claim 1, wherein the easy-opening portion has a shape that tapers from the outer edge of the seal portion in the width direction of the seal portion.

The packaging bag according to claim 1, wherein the laminated film has at least a base film layer and a sealant layer which is an innermost layer.

The laminated film is subjected to rough surface processing having through holes in the region of the easy-opening portion of at least the layer having the highest tear strength, and the laminated film further has a sealant layer as the innermost layer. The packaging bag according to claim 1.

The packaging bag has a neck portion in the middle in the vertical direction, and the width of the packaging bag is narrower on the upper side of the neck portion than the region from the bottom portion to the neck portion. The side edges are formed to change in a curved shape,
The packaging bag according to claim 1, wherein the easy-opening part is partially formed on a side edge of the neck part or a region above the neck part .

The opening position where the opening should be started is limited to a partial region on the outer edge of the seal part formed by bonding the laminated films to the edge part of the packaging bag, and the outside of the seal part at the opening position. From the edge to at least the middle of the width direction of the seal part, it is a method for manufacturing a packaging bag provided with an easy-opening part with reduced tear strength in the film layer having the highest tear strength in the laminated film,
Prepare two or more films, and press one of the processed members provided on a part of the outer peripheral surface of the roller in accordance with the shape and dimensions of the easy-opening portion on one of the films. To form a part with reduced tear strength,
In other films, a portion with reduced tear strength is formed in a wider area including the area of the easy-opening part,
Each film and other layers as necessary, align the position of the region that becomes the easy-opening part, laminate in any order to create a laminated film,
One or two or more laminated films prepared in this way are folded and / or overlapped, the position of the region that becomes the easy-opening portion is aligned, and the laminated film that abuts at least at the open end of the edge portion. A method for manufacturing a packaging bag, wherein the edges are bonded together and sealed.

The packaging bag has a neck part in the middle in the vertical direction, and the width of the packaging bag is narrower on the upper side of the neck part than the region from the bottom part to the neck part. The side edges are formed to change in a curved shape,
The region to be the easy-opening portion is an outer edge of the laminated film and is an area above the neck or the neck, and the laminated film is cut in accordance with the shape of the packaging bag which is the final form. The method for producing a packaging bag according to claim 6, wherein the laminated film is folded and / or overlapped with another film to seal the edge portion.