JP2004136493A

JP2004136493A - Bottom heating plate for producing self-supported bag and method for producing self-supported bag

Info

Publication number: JP2004136493A
Application number: JP2002301812A
Authority: JP
Inventors: Hideharu Yamagishi; 山岸　秀春
Original assignee: Dai Nippon Printing Co Ltd
Current assignee: Dai Nippon Printing Co Ltd
Priority date: 2002-10-16
Filing date: 2002-10-16
Publication date: 2004-05-13
Anticipated expiration: 2022-10-16
Also published as: JP4270838B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bottom heating plate for producing a self-supported bag which has falling impact resistance after the filling the bag with content and improved in its performance as a product by preventing the occurrence of a dimple-like depression, and a method for producing the self-supported bag. <P>SOLUTION: The bottom heating plate for producing the self-supported bag comprises the 1/4 elliptic curve of a first ellipse with its long axis turned in the X-axis direction, the 1/4 elliptic curve of a second ellipse with its long axis turned in the Y-axis direction which is consecutive to the 1/4 elliptic curve of the first ellipse, the 1/4 elliptic curve of a third ellipse with its long axis turned in the X-axis direction which is consecutive to the 1/4 elliptic curve of the second ellipse, the 1/4 elliptic curve of a fourth ellipse with its long axis turned in the Y-axis direction which is consecutive to the 1/4 elliptic curve of the third ellipse, and the 1/4 elliptic curve of a fifth ellipse with its long axis turned in the X-axis direction which is consecutive to the 1/4 elliptic curve of the fourth ellipse and has a seal shape including an arcuate contour with an inflection point made only the maximum point of the third ellipse. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、自立性袋の製造用底熱板及び自立性袋の製造方法に関し、更に詳しくは液体、粉体、固体等が充填される自立性袋の落下時に発生する底部破袋不良の改善に関する。
【０００２】
【従来の技術】
従来の自立性袋、所謂スタンディングパウチは、図１に示すように、表側胴シート１、裏側胴シート２と中央の折線に沿って山折りされた底板３とからなり、表側胴シート１及び裏側胴シート２の間に中央の折線に沿って山折りした底板３を挟み、図２に示すように、前記表裏の胴シート１、２の内面とそれらに対向する山折りした底板３の外面間を上方に弧状輪郭を有するシール形状の底熱板によりシール５し、表裏の胴シート１、２の両側辺をシール７してなるものである（例えば特許文献１、特許文献２、特許文献３、特許文献４等参照）。尚、底板３には袋に自立性を与えるために予め底板３に半球状の丸穴４が抜き加工され、抜かれた部分を通して表裏の胴シート１、２の内面同士が接合される（特許文献２、特許文献３等参照）。また包装内容物を充填したときに最も負荷がかかる部分にポイントシール６がサイドシール７の前に施される（特許文献４参照）。
【０００３】
【特許文献１】
実開昭５７−８０４３５号公報（第１図）
【特許文献２】
実開昭５９−１１８７４４号公報（第１図）
【特許文献３】
実開昭６３−７６４４号公報（実用新案登録請求の範囲第１項、第１図）
【特許文献４】
特開２００１−２０６３８４号公報（段落番号［０００６］）
【０００４】
図３（Ａ）、図３（Ｂ）、図３（Ｃ）は、表裏の胴シート１、２の内面とそれらに対向する山折りした底板３の外面間をシールするための上方に弧状輪郭を有するシール形状の底熱板８、底熱板３を用いて表裏の胴シート１、２の内面とそれらに対向する山折りした底板３の外面間をシールした後、連続する二つの底板３、３間の富士山の頂上の形状にシールされた部分にポイントシール熱板９によりポイントシールが施される過程、及びサイド熱板１０により表裏の胴シート１、２の両側辺をシールする過程を示す。尚１１はシール後に個々の袋に切断する切断線を示す。
【０００５】
両シート間にはさまれた底板３の中央折線の位置（底板の折込高さ線）は、両シートとその間にはさまれた底板が底熱板に送られる過程で上下に変動する。この底板の折込高さ線の変動と自立性袋の落下時の破袋性の関係について説明する。
【０００６】
図４は底板の折込高さ線の変動と自立性袋の落下時の破袋性の関係を示す。底板の折込高さ線ｂ１のときは底熱板のシール曲線（底熱板の弧状輪郭を表す曲線）ｐ１と底板の折込高さ線ｂ１が交差する点ｅはサイドシール部７内にある。この場合底板シールとサイドシールのシールで形成される実シール線長が長くなると共に衝撃の負荷が曲率がきつくなった部分であるｅ点に集中するために破袋しやすくなる（このとき、図５（Ｃ）に示すような自立性袋を底側から見た状態となる。）
【０００７】
本来、なめらかな曲率の弧状輪郭にシール底板を両胴シートにシールした方が自立性袋はきれいなふくらみをもつ。即ち、底板の折込高さ線ｂ２とシール曲線ｐ１の交点ａがサイドシールの輪郭線ｆと一致する場合においてはシール曲線ｐ１の曲率がなだらかなため落下衝撃の衝撃の負荷は緩和され、シール外観も良好である（このとき、図５（Ｂ）に示すような自立性袋を底側から見た状態となる。）
【０００８】
そのため自立性袋を作る場合底板の折込高さ線が交点ａよりも下のｂ３となるように底熱板を設定することが好ましい（このとき、図５（Ａ）に示すような自立性袋を底側から見た状態となる。）この場合、落下衝撃の負荷はｃ点（底板の折込高さ線ｂ３）上で受けるため、明らかに衝撃強度は分散されるため耐性は増す。しかしこのように底熱板を設定すると連続する二つの底板間の富士山の頂上の形状にシールされた部分がサイドシールからはみ出し、そのため自立性袋に内容物を充填して自立性袋を自立させたとき、自立性袋のｃ点に対応する位置に笑窪状のへこみが生じ、見栄が悪い。
【０００９】
【発明が解決しようとする課題】
従って底板の折込高さ線ｂ２になるようにシールできればよいわけだが、流れ方向の滑り性によるずれ、幅方向の蛇行が発生するため安定して底板の折込高さ線ｂ２の位置に底板を位置させてシールを行うことは難しかった。また、そのため、自立性袋製品の耐圧強度を維持させ、且つ笑窪状のへこみの発生をなくして製品としての出来ばえをよくすることは出来なかった。
【００１０】
本発明の目的は、内容物充填後の自立性袋の耐落下衝撃性を備え、且つ笑窪状のへこみの発生をなくして製品としての出来ばえをよくした自立性袋製造用の底熱板及び自立性袋の製造方法を提供することである。
【００１１】
【課題を解決するための手段】
請求項１に記載の発明は、底熱板に関する課題を解決するもので、長軸がＸ軸方向に向いた第１の楕円の１／４楕円曲線と、前記第１の楕円の１／４楕円曲線に連続する、長軸がＹ軸方向に向いた第２の楕円の１／４楕円曲線と、前記第２の楕円の１／４楕円曲線に連続する、長軸がＸ軸方向に向いた第３の楕円の１／４楕円曲線と、前記第３の楕円の１／４楕円曲線に連続する、長軸がＹ軸方向に向いた第４の楕円の１／４楕円曲線と、前記第４の楕円の１／４楕円曲線に連続する、長軸がＸ軸方向に向いた第５の楕円の１／４楕円曲線からなり、変曲点を第３の楕円の極大点のみとした弧状輪郭を含むシール形状の自立性袋の製造用底熱板を要旨とする。
【００１２】
請求項２に記載の発明は、自立性袋の製造方法に関する課題を解決するもので、表側胴シート及び裏側胴シートの間に中央の折線に沿って山折りした底板を挟み、前記表裏の胴シートの内面とそれらに対向する山折りした底板の外面間を上方に弧状輪郭を有するシール形状の底熱板によりシールする自立性袋の製造方法において、底熱板として、長軸がＸ軸方向に向いた第１の楕円の１／４楕円曲線と、前記第１の楕円の１／４楕円曲線に連続する、長軸がＹ軸方向に向いた第２の楕円の１／４楕円曲線と、前記第２の楕円の１／４楕円曲線に連続する、長軸がＸ軸方向に向いた第３の楕円の１／４楕円曲線と、前記第３の楕円の１／４楕円曲線に連続する、長軸がＹ軸方向に向いた第４の楕円の１／４楕円曲線と、前記第４の楕円の１／４楕円曲線に連続する、長軸がＸ軸方向に向いた第５の楕円の１／４楕円曲線からなり、変曲点を第３の楕円の極大点のみとした弧状輪郭を含むシール形状の底熱板を用いることを特徴とする自立性袋の製造方法を要旨とする。
【００１３】
本発明の底熱板は、長軸がＸ軸方向に向いた第１の楕円の１／４楕円曲線と、前記第１の楕円の１／４楕円曲線に連続する、長軸がＹ軸方向に向いた第２の楕円の１／４楕円曲線と、前記第２の楕円の１／４楕円曲線に連続する、長軸がＸ軸方向に向いた第３の楕円の１／４楕円曲線と、前記第３の楕円の１／４楕円曲線に連続する、長軸がＹ軸方向に向いた第４の楕円の１／４楕円曲線と、前記第４の楕円の１／４楕円曲線に連続する、長軸がＸ軸方向に向いた第５の楕円の１／４楕円曲線からなり、変曲点を第３の楕円の極大点のみとした弧状輪郭を含むシール形状を有するので、従来の底熱板に比較してシール面積が広い。従って本発明の底熱板を用いることにより耐圧強度が向上した自立性袋を製造することができる。
また、従来の底熱板に比較して、シール形状がＸ軸方向に変動の少ない長軸がＹ軸方向に向いた第２の楕円の１／４楕円曲線を含むので、底板の折込高さ線の変動の許容範囲を広くすることができる。
また、５つの楕円の１／４楕円曲線からなる１つのスロープの中に１つの極大点しか存在しないので自立性袋に内容物を充填したときに笑窪状のへこみが発生することはない。
【００１４】
【発明の実施の形態】
図６（Ａ）は従来の底熱坂のシール形状の弧状輪郭の作図方式を示す。また図６（Ｂ）は本発明の底熱板のシール形状の弧状輪郭の作図方式を示す。
【００１５】
従来の底熱板において、シール形状の弧状輪郭は、第１の楕円Ｑ１０の１／４楕円曲線Ｌ１０と第２の楕円Ｑ２０の１／４楕円曲線Ｌ２０を接点ｍ１を介して連続させたものであり、接点ｍ１において急激に変化するものである。
【００１６】
これに対し本発明の底熱板において、シール形状の弧状輪郭は、長軸がＸ軸方向に向いた第１の楕円Ｑ１の１／４楕円曲線Ｌ１と、前記第１の楕円Ｑ１の１／４楕円曲線Ｌ１に連続する、長軸がＹ軸方向に向いた第２の楕円Ｑ２の１／４楕円曲線Ｌ２と、前記第２の楕円Ｑ２の１／４楕円曲線Ｌ２に連続する、長軸がＸ軸方向に向いた第３の楕円Ｑ３の１／４楕円曲線Ｌ３と、前記第３の楕円Ｑ３の１／４楕円曲線Ｌ３に連続する、長軸がＹ軸方向に向いた第４の楕円Ｑ４の１／４楕円曲線Ｌ４と、前記第４の楕円Ｑ４の１／４楕円曲線Ｌ４に連続する、長軸がＸ軸方向に向いた第５の楕円Ｑ５の１／４楕円曲線Ｌ５からなり、変曲点を第３の楕円の極大点のみとした弧状輪郭を含む。ここにおいて、楕円Ｑ１〜Ｑ５の各楕円の長軸短軸比は任意に設定することができる。図６（Ｂ）に示す作図方式により得られる曲線の頂点はｍ２は従来の底熱板の頂点ｍ１のような鋭点ではなく楕円Ｑ３の極大点である。
【００１７】
従来の底熱板を用いて作製した自立性袋においては、落下衝撃による自立性袋の破裂減少は底板の折込高さ線ｂ１、ｂ２、ｂ３と底板のシール曲線ｐ１の交点となるｅ、ａ、ｃの各点に、衝撃が集中するために発生する。この落下衝撃に対する耐性の評価を便宜上、底板のシール曲線と底板とサイドシールの交点で示される面積Ｓが大きく取れるほど衝撃強度に関しても有利に作用することに基づいて行うものとすると、従来の底熱板においては、耐落下強度は、図４に示すようにＳ：ｃｄ３ｄ＞Ｓ：ａｄ２ｄ＞Ｓ：ｅｄ１ｄとシール曲線ｐ１に応じて大きく変動する。
【００１８】
これに対し、本発明の底熱板においては、図７から明らかなように、Ｓ：ｃ１ｄ１３ｄ１０、Ｓ：ａ１ｄ１２ｄ１０、Ｓ：ｅ１ｄ１１ｄ１０の変動は小さい。即ち、本発明の底熱板においては、シール形状がＸ軸方向に変動の少ない長軸がＹ軸方向に向いた第２の楕円の１／４楕円曲線を含むので、底板の折込高さ線の変動の許容範囲を広くすることができる。
【００１９】
また、従来の底熱板に比較してシール面積が広く、本発明の底熱板を用いることにより耐圧強度が向上した自立性袋を製造することができる。
また、５つの楕円の１／４楕円曲線からなる１つのスロープの中に１つの極大点しか存在しないので自立性袋に内容物を充填したときに笑窪状のへこみが発生することはない。
【００２０】
図８は本発明の底熱板１８を示す。本発明の極大点を１乃至３個備えることができる。
【００２１】
【実施例】
（実施例）
内寸幅９６ｍｍ、底板の折込高さ２８ｍｍ、サイドシール幅８ｍｍ、底シール幅６ｍｍ、全長２００ｍｍの自立性袋を、本発明の底熱板を用いて作製した。
この底熱板は長軸がＸ軸方向に向いた第１の楕円Ｑ１（長径２４ｍｍ、短径１６ｍｍ）の１／４楕円曲線Ｌ１と、前記第１の楕円Ｑ１の１／４楕円曲線Ｌ１に連続する、長軸がＹ軸方向に向いた第２の楕円Ｑ２（長径４０ｍｍ、短径１８ｍｍ）の１／４楕円曲線Ｌ２と、前記第２の楕円Ｑ２の１／４楕円曲線Ｌ２に連続する、長軸がＸ軸方向に向いた第３の楕円Ｑ３（長径６ｍｍ、短径４ｍｍ）の１／４楕円曲線Ｌ３と、前記第３の楕円Ｑ３の１／４楕円曲線Ｌ３に連続する、長軸がＹ軸方向に向いた第４の楕円Ｑ４（長径４０ｍｍ、短径１８ｍｍ）の１／４楕円曲線Ｌ４と、前記第４の楕円Ｑ４の１／４楕円曲線Ｌ４に連続する、長軸がＸ軸方向に向いた第５の楕円Ｑ５（長径２４ｍｍ、短径１６）の１／４楕円曲線Ｌ５からなり、変曲点を第３の楕円の極大点のみとした弧状輪郭を含む底熱板を作製した。また胴シート及び底板の材料として、２軸延伸ポリエチレンテレフタレートフィルム１２μ／２軸延伸ナイロンフィルム１５μ／ポリエチレンフィルム１２０μをドライラミネートにより貼合してなる積層シートを用いた。この積層シートを用い、本発明の底熱板を用い、自立性袋を１０袋作製した。また、同様にして、但し、底板の折込高さ２８ｍｍに対し、±２ｍｍ底板の折込位置を変えて自立性袋を１０袋宛作製した。
作製した自立性袋の各サンプル１０袋内に水５００ｍｌを充填した後自立性袋の口元をシールしたもののそれぞれについて１ｍの高さから垂直落下テストを行った。結果は表１に示すように破裂はなく、底部のシール外観も良好であった。
【００２２】
【表１】

【００２３】
（比較例）
実施例と同様にして、但し底熱板として第１の楕円Ｑ１０（長径４８ｍｍ、短径３２ｍｍ）の１／４楕円曲線Ｌ１０と第２の楕円Ｑ２０（長径４８ｍｍ、短径３２ｍｍ）の１／４楕円曲線Ｌ２０を連続させた従来型の底熱板を用いた。
作製した自立性袋の各サンプル１０袋内に水５００ｍｌを充填した後自立性袋の口元をシールしたもののそれぞれについて１ｍの高さから垂直落下テストを行った。結果は表２に示すように底板の折込高さが２８ｍｍのときは破裂はなく、底部のシール外観も良好であった。折込高さが２８ｍｍより２ｍｍだけ下がっている場合について破裂は無かったが底部のシール外観に笑窪状のへこみが見られた。折込高さが２ｍｍだけ上がっている場合については１０個中３個の破裂が見られた。尚、表１、表２においてシール位置は底板の折込高さを示し、０ｍｍは折込高さ２８ｍｍの場合、−２ｍｍは底板の折込高さが２８ｍｍよりも２ｍｍだけ下がった場合、＋２ｍｍは底板の折込高さが２８ｍｍより２ｍｍだけ上がった場合を示す。
【００２４】
【表２】

【００２５】
【発明の効果】
以上詳細に説明したように本発明の自立性袋作製用の底熱板は、長軸がＸ軸方向に向いた第１の楕円の１／４楕円曲線と、前記第１の楕円の１／４楕円曲線に連続する、長軸がＹ軸方向に向いた第２の楕円の１／４楕円曲線と、前記第２の楕円の１／４楕円曲線に連続する、長軸がＸ軸方向に向いた第３の楕円の１／４楕円曲線と、前記第３の楕円の１／４楕円曲線に連続する、長軸がＹ軸方向に向いた第４の楕円の１／４楕円曲線と、前記第４の楕円の１／４楕円曲線に連続する、長軸がＸ軸方向に向いた第５の楕円の１／４楕円曲線からなり、変曲点を第３の楕円の極大点のみとした弧状輪郭を含むシール形状を有するので、従来の底熱板に比較してシール面積が広い。従って本発明の底熱板を用いることにより耐圧強度が向上した自立性袋を製造することができる。
【００２６】
また、従来の底熱板に比較して、シール形状がＸ軸方向に変動の少ない長軸がＹ軸方向に向いた第２の楕円の１／４楕円曲線を含むので、底板の折込高さ線の変動の許容範囲を広く取ることができる。
【００２７】
また、５つの楕円の１／４楕円曲線からなる１つのスロープの中に１つの極大点しか存在しないので自立性袋に内容物を充填したときに笑窪状のへこみが発生することはないという利点を有する。
【図面の簡単な説明】
【図１】従来の自立性袋を示し、（Ａ）は表裏の胴シートの斜視図、（Ｂ）は底板の斜視図である。
【図２】従来の自立性袋の側面図である。
【図３】自立性袋の製造過程を示し、（Ａ）は底熱板の側面図であり、（Ｂ）はポイントシール熱板でシールする場合の側面図であり、（Ｃ）はサイド熱板により表裏の胴シートの両側辺をシールする過程を示す側面図である。
【図４】底板の折込高さ線の変動と自立性袋の落下時の破袋性の関係を示すグラフである。
【図５】底板を底側から見た図であり、（Ａ）は底板の折込深さがｂ３のときの自立性袋の底側から見た図、（Ｂ）は底板の折込高さがｂ２のときの底側から見た自立性袋の図であり、（Ｃ）は底板の折込深さがｂ３のときの底側からみた自立性袋の図である。
【図６】（Ａ）は従来の底熱板のシール曲線の作図方式の説明図であり、（Ｂ）は本発明の底熱板のシール曲線の作図方式の説明図である。
【図７】本発明の底熱板の底板の折込高さ線の変動と自立性袋の落下時の破袋性の関係を示すグラフである。
【図８】本発明の底熱板の側面図である。
【符号の説明】
１、２　　　胴シート
３　　　　　底板
４　　　　　丸穴
５　　　　　底板のシール部
６　　　　　ポイントシール部
７　　　　　サイドシール部
８　　　　　底熱板
９　　　　　ポイントシール熱板
１０　　　　サイドシール熱板
ｂ１〜ｂ３　底板の折込高さ線
ｐ１　　　　シール曲線
ｐ２　　　　サイドシール部に沿った切断線
ｆ　　　　　サイドシールの輪郭線
ｅ　　　　　底板の折込高さ線ｂ１とシール曲線ｐ１の交点
ａ　　　　　底板の折込高さ線ｂ２とシール曲線ｐ１の交点
Ｃ　　　　　底板の折込高さ線ｂ３とシール曲線ｐ１の交点
ｄ　　　　　シール曲線ｐ１の頂点
ｄ１　　　　底板の折込高さ線ｂ１と切断線ｐ２の交点
ｄ２　　　　底板の折込高さ線ｂ２と切断線ｐ２の交点
ｄ３　　　　底板の折込高さ線ｂ３と切断線ｐ２の交点
ｍ１　　　　従来の底熱板のシール曲線の頂点
ｍ２　　　　本発明の底熱板のシール曲線の極大点
Ｑ１０、Ｑ２０　　楕円
Ｑ１〜Ｑ５　　　　楕円
Ｌ１０、Ｌ２０　　　１／４楕円曲線
Ｌ１〜Ｌ５　　　　　１／４楕円曲線
１８　　　　本発明の底熱板[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bottom heating plate for manufacturing a self-supporting bag and a method for manufacturing a self-supporting bag, and more particularly, to improve bottom bag breaking failure that occurs when a self-supporting bag filled with liquid, powder, solid, or the like is dropped. About.
[0002]
[Prior art]
As shown in FIG. 1, a conventional self-supporting bag, a so-called standing pouch, includes a front side body sheet 1, a back side body sheet 2, and a bottom plate 3 that is mountain-folded along a central fold line. As shown in FIG. 2, between the inner surface of the front and

back body sheets

1 and 2 and the outer surface of the mountain-folded bottom plate 3 facing them, as shown in FIG. Is sealed with a seal-shaped bottom heat plate having an arcuate contour upward, and both sides of the front and

back body sheets

1 and 2 are sealed 7 (for example, Patent Document 1, Patent Document 2, Patent Document 3). , See Patent Document 4). In addition, in order to give the bag self-supporting property, a semispherical round hole 4 is punched in the bottom plate 3 in advance, and the inner surfaces of the front and

back trunk sheets

1 and 2 are joined to each other through the extracted portion (Patent Literature). 2, see Patent Document 3). In addition, a point seal 6 is applied in front of the side seal 7 in a portion that is most loaded when the package contents are filled (see Patent Document 4).
[0003]
[Patent Document 1]
Japanese Utility Model Publication No. 57-80435 (Fig. 1)
[Patent Document 2]
Japanese Utility Model Publication No.59-118744 (FIG. 1)
[Patent Document 3]
Japanese Utility Model Publication No. 63-7644 (Utility Model Registration Request Claims 1 and 1)
[Patent Document 4]
JP 2001-206384 A (paragraph number [0006])
[0004]
3 (A), 3 (B), and 3 (C) are arcuate contours for sealing between the inner surfaces of the front and

back trunk sheets

1 and 2 and the outer surface of the mountain-folded bottom plate 3 facing them. After sealing between the inner surface of the front and

back trunk sheets

1 and 2 and the outer surface of the mountain-folded bottom plate 3 facing them using the bottom heat plate 8 and the bottom heat plate 3 having a continuous shape, two continuous bottom plates 3 A process in which a point seal is applied by a point seal hot plate 9 to a portion sealed in the shape of the top of Mt. Fuji between 3 and a process in which both sides of the front and

back trunk sheets

1 and 2 are sealed by a side hot plate 10 Show. In addition, 11 shows the cutting line cut | disconnected to each bag after sealing.
[0005]
The position of the central folding line of the bottom plate 3 sandwiched between both sheets (folding height line of the bottom plate) fluctuates up and down in the process of sending both sheets and the bottom plate sandwiched between them to the bottom heat plate. The relationship between the change in the folding line of the bottom plate and the bag breaking property when the freestanding bag is dropped will be described.
[0006]
FIG. 4 shows the relationship between the fluctuation of the folding line of the bottom plate and the bag breaking property when the self-supporting bag is dropped. In the case of the bottom plate folding height line b1, a point e where the bottom heating plate sealing curve (curve representing the arcuate contour of the bottom heating plate) p1 and the bottom plate folding height line b1 intersect is in the side seal portion 7. In this case, the actual seal line length formed by the bottom plate seal and the side seal becomes longer, and the impact load is concentrated at the point e where the curvature is tighter, which makes it easier to break the bag. (It will be in the state which looked at the self-supporting bag as shown to 5 (C) from the bottom side.)
[0007]
Inherently, the self-supporting bag has a more beautiful bulge when the bottom plate is sealed on both body sheets with an arcuate contour with a smooth curvature. That is, when the intersection a of the bottom plate folding height line b2 and the seal curve p1 coincides with the side seal outline f, the curvature of the seal curve p1 is gentle, so that the impact of the drop impact is alleviated and the seal appearance (At this time, the self-supporting bag as shown in FIG. 5B is viewed from the bottom side.)
[0008]
Therefore, when making a self-supporting bag, it is preferable to set the bottom heat plate so that the folding height line of the bottom plate is b3 below the intersection point a (at this time, the self-supporting bag as shown in FIG. 5A) In this case, since the load of the drop impact is received on the point c (folding height line b3 of the bottom plate), the impact strength is obviously dispersed and the resistance is increased. However, when the bottom heat plate is set in this way, the part sealed in the shape of the top of Mt. Fuji between the two continuous bottom plates protrudes from the side seal, so the self-supporting bag is filled with the contents and the self-supporting bag is made self-supporting. When this occurs, a smile-like dent is generated at a position corresponding to the point c of the self-supporting bag, and the appearance is poor.
[0009]
[Problems to be solved by the invention]
Therefore, it is only necessary to be able to seal the bottom plate into the folding height line b2, but since the slippage in the flow direction and the meandering in the width direction occur, the bottom plate is stably positioned at the folding height line b2 of the bottom plate. It was difficult to seal. For this reason, the pressure resistant strength of the self-supporting bag product can be maintained, and the appearance of the product cannot be improved by eliminating the generation of the dents.
[0010]
An object of the present invention is to provide a bottom hot plate for manufacturing a self-supporting bag having a drop impact resistance of the self-supporting bag after filling the contents, and improving the quality of the product as a product by eliminating the occurrence of a dent in the shape of a smile. It is providing the manufacturing method of a sex bag.
[0011]
[Means for Solving the Problems]
The invention according to claim 1 solves the problem related to the bottom heat plate, and the first ellipse ¼ elliptic curve whose major axis is in the X-axis direction and ¼ of the first ellipse. Continuing to the elliptic curve of the second ellipse with the major axis in the Y-axis direction and the ellipse curve of the second ellipse with the major axis in the X-axis direction A quarter elliptic curve of the third ellipse, a quarter elliptic curve of the fourth ellipse having a major axis in the Y-axis direction, which is continuous with the quarter elliptic curve of the third ellipse, Continuing from the fourth elliptic curve of the fourth ellipse, the ellipse consists of a fourth elliptic curve of the fifth ellipse whose major axis is in the X-axis direction, and the inflection point is only the maximum point of the third ellipse. The gist is a bottom hot plate for producing a self-supporting bag having a seal shape including an arcuate contour.
[0012]
Invention of Claim 2 solves the subject regarding the manufacturing method of a self-supporting bag, and sandwiches a bottom plate which is mountain-folded along a central folding line between a front side body sheet and a back side body sheet, and In a method for manufacturing a self-supporting bag in which a space between an inner surface of a sheet and an outer surface of a mountain-folded bottom plate facing each other is sealed upward with a seal-shaped bottom heat plate having an arcuate contour, the major axis is the X-axis direction A first elliptical curve of the first ellipse facing the first elliptical curve, and a second elliptical curve of the second ellipse whose major axis is oriented in the Y-axis direction, which is continuous with the first elliptical curve of the first ellipse. , Continuous with a quarter elliptic curve of the second ellipse, continuous with a quarter elliptic curve of the third ellipse whose major axis is in the X-axis direction, and a quarter elliptic curve of the third ellipse A fourth elliptic curve of the fourth ellipse whose major axis is in the Y-axis direction and a quarter of the fourth ellipse. A seal-shaped bottom comprising an arc-shaped contour that is formed of a ¼ elliptic curve of the fifth ellipse that is continuous with the circular curve and whose major axis is in the X-axis direction, and whose inflection point is only the maximum point of the third ellipse. The gist is a method for producing a self-supporting bag characterized by using a hot plate.
[0013]
The bottom heat plate of the present invention has a long axis that is continuous with a quarter elliptic curve of the first ellipse whose major axis is in the X axis direction and a quarter elliptic curve of the first ellipse, and the major axis is the Y axis direction. A second elliptical curve of the second ellipse facing the first elliptical curve, and a third elliptical curve of the third ellipse, the major axis of which is continuous with the second elliptical curve of the second ellipse and facing the X-axis direction; , Continuous with a quarter elliptic curve of the third ellipse, continuous with a quarter elliptic curve of the fourth ellipse with the major axis oriented in the Y-axis direction, and a quarter elliptic curve of the fourth ellipse The long axis of the ellipse is composed of a quarter ellipse curve of the fifth ellipse and the arc shape with only the maximum point of the third ellipse as the inflection point. The sealing area is large compared to the bottom heat plate. Therefore, by using the bottom hot plate of the present invention, a self-supporting bag having improved pressure strength can be manufactured.
Moreover, since the seal shape includes a quarter elliptic curve of the second ellipse whose long axis is oriented in the Y-axis direction, the seal shape has less fluctuation in the X-axis direction, so that the folding height of the bottom plate The allowable range of line fluctuation can be widened.
In addition, since there is only one local maximum point in one slope consisting of a quarter ellipse curve of five ellipses, no smile-like dents are generated when the self-supporting bag is filled with contents.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 6 (A) shows a conventional drawing method of an arc-shaped contour of a bottom heat slope seal shape. FIG. 6B shows a drawing method of the arc shape of the seal shape of the bottom heat plate of the present invention.
[0015]
In the conventional bottom heat plate, the arc-shaped contour of the seal shape is obtained by continuing the ¼ elliptic curve L10 of the first ellipse Q10 and the ¼ ellipse curve L20 of the second ellipse Q20 via the contact point m1. There is a sudden change at the contact point m1.
[0016]
On the other hand, in the bottom hot plate of the present invention, the arcuate contour of the seal shape has a 1/4 elliptic curve L1 of the first ellipse Q1 whose major axis is directed in the X-axis direction and 1/1 of the first ellipse Q1. A long axis that is continuous to a quarter elliptic curve L2 of the second ellipse Q2 that is continuous with the four elliptic curve L1, and that is a quarter elliptic curve L2 of the second ellipse Q2 with the long axis oriented in the Y-axis direction. A fourth elliptic curve L3 of the third ellipse Q3 oriented in the X-axis direction and a quarter elliptic curve L3 of the third ellipse Q3, the long axis of which is oriented in the Y-axis direction. From the quarter elliptic curve L4 of the ellipse Q4 and the quarter elliptic curve L5 of the fifth ellipse Q5 that is continuous with the quarter elliptic curve L4 of the fourth ellipse Q4 and whose major axis is in the X-axis direction. Therefore, it includes an arcuate contour whose inflection point is only the maximum point of the third ellipse. Here, the major axis / minor axis ratio of each ellipse of ellipses Q1 to Q5 can be arbitrarily set. The vertex of the curve obtained by the drawing method shown in FIG. 6B is not the sharp point like the vertex m1 of the conventional bottom heat plate, but the maximum point of the ellipse Q3.
[0017]
In a self-supporting bag manufactured using a conventional bottom heat plate, the burst reduction of the self-supporting bag due to a drop impact is the intersection of the bottom plate folding height lines b1, b2, b3 and the bottom plate seal curve p1 e, a , C because the impact is concentrated on each point. For the sake of convenience, this resistance to drop impact is evaluated on the basis of the fact that the larger the area S indicated by the bottom plate seal curve and the intersection of the bottom plate and the side seal, the more advantageously the impact strength acts. In the hot plate, as shown in FIG. 4, the drop-proof strength greatly varies depending on S: cd3d> S: ad2d> S: ed1d and the seal curve p1.
[0018]
On the other hand, in the bottom heat plate of the present invention, as is clear from FIG. 7, the fluctuations of S: c1d13d10, S: a1d12d10, and S: e1d11d10 are small. That is, in the bottom hot plate of the present invention, the seal shape includes a 1/4 elliptic curve of the second ellipse whose major axis with little variation in the X-axis direction faces the Y-axis direction. The allowable range of fluctuations can be widened.
[0019]
In addition, a self-supporting bag having a larger sealing area than the conventional bottom heat plate and having improved pressure resistance can be manufactured by using the bottom heat plate of the present invention.
In addition, since there is only one local maximum point in one slope consisting of a quarter ellipse curve of five ellipses, no smile-like dents are generated when the self-supporting bag is filled with contents.
[0020]
FIG. 8 shows the bottom hot plate 18 of the present invention. One to three local maximum points of the present invention can be provided.
[0021]
【Example】
(Example)
A self-supporting bag having an inner dimension width of 96 mm, a bottom plate folding height of 28 mm, a side seal width of 8 mm, a bottom seal width of 6 mm, and a total length of 200 mm was produced using the bottom heat plate of the present invention.
The bottom heat plate is divided into a quarter ellipse curve L1 of a first ellipse Q1 (major axis 24 mm, minor axis 16 mm) whose major axis is in the X-axis direction and a quarter ellipse curve L1 of the first ellipse Q1. Continuation is continued to a quarter ellipse curve L2 of the second ellipse Q2 (major axis 40 mm, minor axis 18 mm) whose major axis is in the Y-axis direction, and a quarter ellipse curve L2 of the second ellipse Q2. A long elliptical curve L3 of a third ellipse Q3 (major axis 6 mm, minor axis 4 mm) whose major axis is oriented in the X-axis direction and a quarter ellipse curve L3 of the third ellipse Q3 are continuous. The long axis is continuous to the ¼ elliptic curve L4 of the fourth ellipse Q4 (major axis 40 mm, minor axis 18 mm) whose axis is in the Y-axis direction and the ¼ ellipse curve L4 of the fourth ellipse Q4. Consists of a quarter ellipse curve L5 of the fifth ellipse Q5 (major axis 24mm, minor axis 16) oriented in the X-axis direction. To prepare a bottom heat plate including an arcuate contour as only maximum point of the third ellipse. Moreover, the laminated sheet formed by bonding the biaxially stretched polyethylene terephthalate film 12 μ / 2 biaxially stretched nylon film 15 μm / polyethylene film 120 μm by dry lamination was used as the material for the body sheet and the bottom plate. Using this laminated sheet, 10 self-supporting bags were produced using the bottom heat plate of the present invention. In the same manner, however, 10 self-supporting bags were produced by changing the folding position of the ± 2 mm bottom plate with respect to the folding height of the bottom plate of 28 mm.
A vertical drop test was carried out from a height of 1 m on each of the 10 self-supporting bags produced by filling 500 ml of water and sealing the mouth of the self-supporting bag. As a result, as shown in Table 1, there was no rupture, and the seal appearance at the bottom was good.
[0022]
[Table 1]

[0023]
(Comparative example)
As in the example, except that the bottom heat plate is a quarter ellipse curve L10 of the first ellipse Q10 (major axis 48 mm, minor axis 32 mm) and a quarter of the second ellipse Q20 (major axis 48 mm, minor axis 32 mm). A conventional bottom hot plate with a continuous elliptic curve L20 was used.
A vertical drop test was carried out from a height of 1 m on each of the 10 self-supporting bags produced by filling 500 ml of water and sealing the mouth of the self-supporting bag. As shown in Table 2, when the folding height of the bottom plate was 28 mm, there was no rupture and the bottom seal appearance was good. There was no rupture when the folding height was lowered by 2 mm from 28 mm, but a smile-like dent was seen in the seal appearance at the bottom. When the folding height was increased by 2 mm, 3 out of 10 bursts were observed. In Tables 1 and 2, the sealing position indicates the folding height of the bottom plate, 0 mm is the folding height of 28 mm, -2 mm is the folding height of the bottom plate that is 2 mm lower than 28 mm, +2 mm is the bottom plate height. The case where the folding height is raised by 2 mm from 28 mm is shown.
[0024]
[Table 2]

[0025]
【The invention's effect】
As described above in detail, the bottom heat plate for producing a self-supporting bag of the present invention has a ¼ elliptic curve of the first ellipse whose major axis is directed in the X-axis direction, and 1 / of the first ellipse. The second elliptical curve that is continuous with the 4th elliptic curve and the long axis is continuous with the 1/4 elliptical curve of the second ellipse with the long axis in the Y-axis direction, and the long axis is in the X-axis direction. A quarter elliptic curve of the third ellipse that is oriented, and a quarter elliptic curve of the fourth ellipse that is continuous with the quarter elliptic curve of the third ellipse and whose major axis is oriented in the Y-axis direction; The fourth ellipse consists of a quarter ellipse curve of the fifth ellipse, the major axis of which is continuous with the quarter ellipse curve of the fourth ellipse, and the inflection point is only the maximum point of the third ellipse. Since it has a seal shape including an arcuate contour, the seal area is wider than that of a conventional bottom heat plate. Therefore, by using the bottom hot plate of the present invention, a self-supporting bag having improved pressure strength can be manufactured.
[0026]
Moreover, since the seal shape includes a quarter elliptic curve of the second ellipse whose long axis is oriented in the Y-axis direction, the seal shape has less fluctuation in the X-axis direction, so that the folding height of the bottom plate A wide tolerance range of line fluctuation can be obtained.
[0027]
In addition, since there is only one maximum point in one slope consisting of five elliptical quarter elliptic curves, there is no advantage that a dent-like dent will not occur when the contents are filled in a self-supporting bag. Have
[Brief description of the drawings]
1A and 1B show a conventional self-supporting bag, in which FIG. 1A is a perspective view of front and back trunk sheets, and FIG. 1B is a perspective view of a bottom plate.
FIG. 2 is a side view of a conventional self-supporting bag.
FIGS. 3A and 3B show a manufacturing process of a self-supporting bag, wherein FIG. 3A is a side view of a bottom heat plate, FIG. 3B is a side view when sealing with a point seal heat plate, and FIG. It is a side view which shows the process which seals the both sides of the trunk | drum sheet | seat of a front and back with a board.
FIG. 4 is a graph showing the relationship between the change in the folding height line of the bottom plate and the bag breaking property when the self-supporting bag is dropped.
5A is a view of the bottom plate as viewed from the bottom side, FIG. 5A is a view of the bottom plate as viewed from the bottom side when the folding depth of the bottom plate is b3, and FIG. 5B is a view of the folding height of the bottom plate. It is a figure of the self-supporting bag seen from the bottom side at the time of b2, (C) is a figure of the self-supporting bag seen from the bottom side when the folding depth of the bottom plate is b3.
6A is an explanatory diagram of a conventional bottom heat plate sealing curve drawing method, and FIG. 6B is an explanatory view of a bottom heat plate sealing curve drawing method of the present invention.
FIG. 7 is a graph showing the relationship between the change in the folding height line of the bottom plate of the bottom heat plate of the present invention and the bag breaking property when the self-supporting bag is dropped.
FIG. 8 is a side view of the bottom heat plate of the present invention.
[Explanation of symbols]
1, 2 Body sheet 3 Bottom plate 4 Round hole 5 Bottom plate seal part 6 Point seal part 7 Side seal part 8 Bottom heat plate 9 Point seal heat plate 10 Side seal heat plates b1 to b3 Bottom plate folding height line p1 Seal curve p2 Cutting line f along side seal part Side seal outline e Crossing point a of bottom plate folding height line b1 and seal curve p1 Crossing point C of bottom plate folding height line b2 and seal curve p1 Bottom plate folding height line b3 And the intersection d of the seal curve p1 The vertex d1 of the seal curve p1 The intersection d2 of the folding height line b1 of the bottom plate and the cutting line p2 The intersection d3 of the folding height line b2 of the bottom plate and the cutting line p2 Cutting with the folding height line b3 of the bottom plate Intersection m1 of line p2 Vertex m2 of the sealing curve of the conventional bottom heating plate Maximum points Q10, Q20 of the sealing curve of the bottom heating plate of the present invention Ellipses Q1-Q5 Circle L10, L20 1/4 elliptic curve L1 to L5 1/4 bottom heating plate of the elliptic curve 18 the present invention

Claims

A first ellipse ¼ elliptic curve whose major axis is oriented in the X-axis direction and a second ellipse whose major axis is oriented in the Y-axis direction, which is continuous with the ¼ elliptic curve of the first ellipse. A ¼ elliptic curve, a ¼ elliptic curve of a third ellipse that is continuous with the ¼ elliptic curve of the second ellipse, and whose major axis is in the X-axis direction, and 1 of the third ellipse / 4 elliptic curve that is continuous with the fourth elliptical curve of the fourth ellipse whose major axis is in the Y-axis direction and the long axis of the fourth ellipse that is continuous with the ¼ elliptical curve is the X-axis direction A bottom hot plate for manufacturing a self-supporting bag having a seal shape including an arc-shaped contour having an inflection point of only the maximum point of the third ellipse.

A seal having an arcuate contour between the inner surface of the front and back body sheets and the outer surface of the mountain folded bottom plate facing the front and back body sheets, with a bottom plate folded in a central fold line between the front and back body sheets. In the manufacturing method of the self-supporting bag sealed with the shape bottom heat plate, as the bottom heat plate, a 1/4 elliptic curve of the first ellipse whose major axis is in the X-axis direction, and 1 / of the first ellipse. The second elliptical curve that is continuous with the 4th elliptic curve and the long axis is continuous with the 1/4 elliptical curve of the second ellipse with the long axis in the Y-axis direction, and the long axis is in the X-axis direction. A quarter elliptic curve of the third ellipse that is oriented, and a quarter elliptic curve of the fourth ellipse that is continuous with the quarter elliptic curve of the third ellipse and whose major axis is oriented in the Y-axis direction; From the fourth elliptical curve of the fifth ellipse that is continuous with the fourth elliptical curve of the fourth ellipse and whose long axis is in the X-axis direction. Ri, method for producing a self-supporting bag which comprises using the bottom thermal plate seal shape including an arcuate contour the inflection point was only local maximum point of the third ellipse.