JP3854541B2

JP3854541B2 - Bending ruled plastic sheet and ruled line blade for the plastic sheet

Info

Publication number: JP3854541B2
Application number: JP2002161137A
Authority: JP
Inventors: 忠橋本; 久司橋本
Original assignee: Mitsubishi Plastics Inc
Current assignee: Mitsubishi Chemical Corp
Priority date: 2002-06-03
Filing date: 2002-06-03
Publication date: 2006-12-06
Anticipated expiration: 2022-06-03
Also published as: JP2004001858A

Description

【０００１】
【発明の属する技術分野】
この発明は、例えば化粧品や文具、玩具、食品等の物品が収容される容器を組立てるときに用いられるプラスチックシートの折り曲げ性及び折り曲げ強度を略同時に満たし得る折り曲げ罫線入りプラスチックシート及びそのプラスチックシート用罫線刃に関する。
【０００２】
【従来の技術】
従来、上述の折り曲げ罫線が付設されたプラスチックシートとしては、例えば凹状刃部と凸状刃部とが刃先頂面部に形成された罫線刃を押し付けて、浅い溝部と深い溝部とからなる折り曲げ罫線を折り曲げ部分に形成した折り曲げ罫線入りプラスチックシート（実公平４−９３４５号公報）と、
側面から見て略半円形状の凹状刃部と、略真っ直ぐな凸状刃部とが刃先頂面部に形成された罫線刃を押し付けて、側面から見て略半円形状の浅い溝部と、略真っ直ぐな深い溝部とからなる折り曲げ罫線を折り曲げ部分に形成した折り曲げ罫線入りプラスチックシート（特開２００１−２９３７７７号公報）と、
プラスチックシートに対して折り曲げ罫線を付設するときに用いられ、頂面部と傾斜部とからなる刃部を長さ方向に対して断続して形成した罫線刃（特開２０００−１５８５６２号公報）とがある。
【０００３】
【発明が解決しようとする課題】
しかし、上述の罫線刃により付設される折り曲げ罫線の底部肉厚を薄くすると、プラスチックシートの折り曲げ特性が向上するが、肉厚の薄い部分が長手方向に対して連続していると、プラスチックシートを折り曲げ罫線に沿って折り曲げたとき、例えば裂け目や大きな孔等が折り曲げ罫線の底部に発生しやすい。また、罫線刃をプラスチックシートに強く押し付けて、折り曲げ罫線底部の薄肉部分を故意に開口すると、その部分から、例えばゴミや水分等の異物が侵入するため、包装容器に収容される物品の商品価値や衛生度が損なわれる。且つ、溝部の段差が大きく、角部が鋭角であるため、折り曲げ部分の手触り感が悪く、布や皮等が引っ掛かりやすい。
【０００４】
一方、罫線刃を深く食込ませて、溝部の肉厚を薄くすると、プラスチックシートが面方向に対して押し広げられるので、分子密度が高くなる。シート及び引っ張り伸び率の小さいシートは、折り曲げ罫線が裂けてしまうことがあり、伸び率の小さい生分解性プラスチックシートには形成することができない。且つ、折り曲げ部分に歪や反り、波打ち等が発生するため、見栄え及び外観が悪くなる。また、プラスチックシートを製函機により容器形態に組立てる場合、停滞したり、詰まったりするため、組立て作業を機械的に行うことが困難であるという問題点を有している。
【０００５】
且つ、プラスチック製のシートを型抜きするとき、先端尖鋭な罫線刃がプラスチックシートに対して押し付けられるので、罫線刃及びプラスチックシートの接触面積が小さく、罫線刃の押し付け位置が変位しやすい。また、特定の罫線刃が先に押し付けられたとき、その押し付け部部に生じる抵抗により、型抜き本体の姿勢が傾くため、罫線刃の押圧バランスが崩れやすく、折り曲げ罫線を、プラスチックシートに対して均一に付設することが困難である。
【０００６】
この発明は上記問題に鑑み、折り曲げ罫線の溝部及びその折り曲げ罫線を付設する罫線刃の刃部を、プラスチックシートの肉厚に応じた割合の深さ及び高さに形成することにより、良好な折り曲げ特性及び柔軟性が得られ、手触り感及び外観性がよく、折り曲げ作業が機械的に行える折り曲げ罫線入りプラスチックシート及びそのプラスチックシート用罫線刃の提供を目的とする。
【０００７】
【課題を解決するための手段】
この発明は、所定角度で傾斜し相互に対峙する一対の側面部と、該側面部の一端側と連続する底面部とからなる凹状の折り曲げ罫線（２）が付設されたプラスチックシートであって、前記底面部内に、プラスチックシートの肉厚（Ａ）の２０〜５０％の深さ（Ｂａ）とプラスチックシートの肉厚（Ａ）の５〜５０％の幅（Ａａ）と該肉厚（Ａ）の１〜２０倍の長さ（Ｂ）とを備えた平坦な溝部（３）を、折り曲げ罫線（２）の長さ方向に間隔をおいて形成すると共に、該溝部（３）、（３）間には、折り曲げ罫線（２）の幅方向或いは該幅方向に対して斜め方向に伸びる、前記平坦な溝部（３）よりも溝底深さがより深い複数の溝部（４）を折り曲げ罫線（２）の長さ方向に連続して形成してなることを特徴とする折り曲げ罫線入りプラスチックシート、並びに、プラスチックシートの折り曲げ部分に対して凹状の折り曲げ罫線を付設するときに用いられ、所定角度で傾斜し相互に対峙する一対の側面部と、該側面部の一端側と連続する頂面部とを有するプラスチックシート用罫線刃であって、前記頂面部内に、プラスチックシートの肉厚（Ａ）の２０〜５０％の高さ（Ｂｂ）とプラスチックシートの肉厚（Ａ）の５〜５０％の幅（Ａａ）と該肉厚（Ａ）の１〜２０倍の長さ（Ｂ）とを備えた平坦な刃部（７）を、折り曲げ罫線（２）の長さ方向に間隔をおいて形成すると共に、該刃部（７）（７）間には、折り曲げ罫線（２）の幅方向或いは該幅方向に対して斜め方向に伸びる、前記平坦な刃部（７）よりも刃先高さがより高い複数の刃部（８）を折り曲げ罫線（２）の長さ方向に連続して形成してなることを特徴とするプラスチックシート用罫線刃を提案する。
【０００８】
上述のプラスチックシートは、例えばポリプロピレン（ＰＰ）やポリエチレンテレフタレート（ＰＥＴ）、生分解性プラスチック等の単体又は複合したプラスチックで形成され、且つ、例えば約０．１ｍｍ〜約１ｍｍの範囲に含まれる所定の肉厚Ａ（例えば略０．３ｍｍ）に形成した透明又は半透明のシートで構成される。つまり、折り曲げ罫線２を、プラスチックシート１の折り曲げ部分に付設する場合、単一枚数又は複数枚数の罫線刃６を、プラスチックシート１の各折り曲げ部分に対して、そのプラスチックシート１の材質や肉厚、強度、硬度等に応じた圧力で押し付け及び所定温度に加熱しながら押し付けて形成する。
【０００９】
上述の折り曲げ罫線２を構成する溝部３，４及びプラスチックシート用罫線刃６を構成する刃部７，８の各部Ａａ，Ａｂ，Ｂ，Ｂａ，Ｃ，Ｃａ，Ｄ，θ１，θ２を、プラスチックシート１の肉厚Ａに応じて下記の数値に設定することができる。つまり、溝部３及び刃部７の幅Ａａを、例えばプラスチックシート１の肉厚Ａに対して略５％〜略５０％の範囲に含まれる幅（例えば略０．１５ｍｍ）に設定し、溝部４及び刃部８の幅Ａｂを、例えばプラスチックシート１の肉厚Ａに対して略５％〜略５５％の範囲に含まれる幅（例えば略０．１５ｍｍ）に設定する。
【００１０】
且つ、溝部３及び刃部７の長さＢを、例えば肉厚Ａに対して略１倍〜略２０倍の範囲に含まれる幅（例えば略０．５ｍｍ）に設定し、溝部４及び刃部８の長さＣを、例えば肉厚Ａに対して略２倍〜略２０倍の範囲に含まれる幅（例えば略０．８ｍｍ）に設定し、溝部４及び刃部８のピッチ間隔Ｄを、例えば肉厚Ａに対して略１０％〜略２００％の範囲に含まれる間隔（例えば略０．２ｍｍ）に設定し、溝部３及び刃部７のピッチ間隔を、上述の溝部４及び刃部８のピッチ間隔Ｄよりも広い間隔に設定する。
【００１１】
且つ、溝部３の深さＢａ及び刃部７の高さＢｂを、例えば肉厚Ａに対して略２０％〜略５０％の範囲に含まれる幅（例えば略０．０８ｍｍ）に設定し、溝部４の深さＣａ及び刃部８の高さＣｂを、例えば肉厚Ａに対して略１０％〜略４００％の範囲に含まれる幅（例えば略０．０８ｍｍ）に設定する。
【００１２】
且つ、折り曲げ罫線２の角度θ１及び罫線刃６の角度θ２を、例えばプラスチックシート１の折り曲げ部分に応じて略１５度〜略１２０度の範囲に含まれる角度に設定する。つまり、プラスチックシート１の前面部１ａと、側面部１ｂと、後面部１ｃと、接合部１ｄとの折り曲げ部分に形成される折り曲げ罫線２の角度θ１及び罫線刃６の角度θ２を略４３度に設定し、折込み部１ｅと、上面部１ｆ及び下面部１ｇとの折り曲げ部分に形成される折り曲げ罫線２の角度θ１及び罫線刃６の角度θ２を略７５度に設定する。
【００１３】
上述のピッチ間隔Ｄを設定値よりも大きくすると、罫線刃６の刃先強度が低下し、プラスチックシート１の折り曲げ特性が悪くなる。また、ピッチ間隔Ｄを設定値よりも小さくすると、刃先の強度が低下し、折り曲げ罫線２を付設するのに充分な効果が得られなくなるので、上述の範囲に含まれる数値に設定するのが好ましい。
【００１４】
且つ、Ａａ，Ａｂ，Ｂ，Ｂａ，Ｃ，Ｃａを設定値よりも大きくすると、プラスチックシート１に付設される折り曲げ罫線２の手触り感及び折り曲げ特性が悪くなる。また、設定値よりも小さくすると、刃先の強度が低下し、折り曲げ罫線２を付設するのに充分な効果が得られなくなるので、上述の範囲に含まれる数値に設定するのが好ましい。
【００１５】
且つ、罫線刃６の食込み角度θ２を大きくすると、折り曲げ罫線２を付設するときに大きな加圧力が必要となり、加工が難しい。プラスチックシート１に反りや波打ち等が発生し、機械的に折り曲げることが困難となる。プラスチックシート１の折り曲げ特性が悪くなる。また、角度θ２を設定値よりも小さくすると、刃先の強度が低下し、寿命が短くなるので、上述の範囲に含まれる数値に設定するのが好ましい。
【００１６】
上述の範囲に含まれる数値であれば、プラスチックシート１の肉厚Ａや材質、強度、硬度等に応じて、折り曲げ罫線２の溝部３，４及び罫線刃６の刃部７，８の幅や長さ、深さ、高さ、間隔（ピッチ）、角度等を変更し、所望する配列及び組み合わせに設定することができる。また、例えば滑らかな曲面形状や略半円形状、略円弧形状、略扇形状或いは略台形状、略四角形状、略三角形状等の何れか特定の形状又は複数を組み合わせた形状に形成することができる。
【００１７】
且つ、折り曲げ罫線２の溝部３，４及び罫線刃６の刃部７，８を、例えば複数近接又は分割して配列したり、滑らかな曲面形状に形成したり、段違いに形成したり、略同一又は異なる幅及び交差する状態に形成することができる。また、例えば梨地模様や小さい凹凸、略縄形状、略鎖形状等の特異形状に形成することができる。
【００１８】
実施の形態として、上記溝部を、略同等又は異なる深さに形成することができる。また、上記刃部を、略同等又は異なる高さに形成することができる。また、上記溝部及び刃部を、滑らかな曲面形状に形成することができる。また、上記溝部の各部を、上記プラスチックシートの肉厚に応じて折り曲げるのに適した所定の範囲に含まれる寸法に設定することができる。また、上記刃部の各部を、上記プラスチックシートの肉厚に応じて上記折り曲げ罫線を形成するのに適した所定の範囲に含まれる寸法に設定することができる。
【００１９】
【作用及び効果】
この発明によれば、折り曲げ罫線の溝部及びその折り曲げ罫線を付設する罫線刃の刃部を、プラスチックシートの肉厚に応じた割合の深さ及び高さに形成するので、プラスチックシートに付与される面方向の応力が小さく、歪や反り、波打ち等が発生したり、その部分に印刷された塗膜が剥離するのを防止することができる。且つ、溝部の段差が小さく、滑らかであるため、プラスチックシートの折り曲げ部分に手が接触しても、ザラツキ感が殆んどなく、触り心地が良い。また、布や皮等が引っ掛からず、折り曲げ部分の外観が美しく、意匠的に優れている。
【００２０】
且つ、折り曲げ罫線の底面部両側部を中心として折り曲げるので、従来例のような折り曲げ罫線の底面中央部を１箇所折り曲げるよりも裂けにくく、長い溝部の肉厚が従来例の折り曲げ罫線よりも大きいため、折り曲げるのに必要な強度が確保され、組立て及び展開が何回でも繰り返し行えると共に、折り曲げ作業及び組立て作業を機械的に行うことができる。
【００２１】
且つ、長さの異なる溝部を複数組み合わせて形成するので、分子密度の高い部分が分散され、伸び率の小さい生分解性プラスチックシートであっても、折り曲げ罫線を簡単且つ容易に加工することができ、プラスチックシートの肉厚に応じて良好な折り曲げ特性及び柔軟性が得られる。また、プラスチックシートを鋭角に折り曲げても裂け目や大きな孔等が発生せず、若し、孔が発生しても極小に抑えられるため、異物が侵入しにくく、商品価値や衛生度が損なわれるのを防止することができる。
【００２２】
【実施例】
この発明の一実施例を以下図面に基づいて詳述する。
図面は、物品が収容される包装容器を組立てるときに用いられる折り曲げ罫線入りプラスチックシート及び折り曲げ罫線を付設するプラスチックシート用罫線刃を示し、図１に於いて、このプラスチックシート１は、例えば約０．３ｍｍ程度の厚さを有する透明又は半透明のプラスチック製シートで構成され、プラスチック製のシートを、包装容器（図２参照）を展開した形状に型抜き又は型抜き後、正面から見て略矩形を有する前面部１ａの両側縁部に連設した左右側面部１ｂと、一方の側面部１ｂの右側縁部に連設した後面部１ｃと、後面部１ｃの右側縁部に連設した接合部１ｄと、側面部１ｂの上下縁部に連設した折込み部１ｅ…と、前面部１ａの上縁部に連設した上面部１ｆ及び下縁部に連設した下面部１ｇと、上面部１ｆ及び下面部１ｇに連設した折込み部１ｈとの折り曲げ部分に、後述する罫線刃６により凹状の折り曲げ罫線２を形成する。また、容器形態に組立てられたプラスチックシート１を吊設するための孔部（図示省略）を、後面部１ｃの上縁部に連設した支持部（図示省略）に設けてもよい。
【００２３】
上述のプラスチックシート１の折り曲げ部分に付設される折り曲げ罫線２は、図３乃至図６に示すように、所定角度で傾斜し相互に対峙する一対の側面部２ａと、側面部２ａ，２ａの一端側と連続する底面部２ｂとで略Ｖ字状に形成され、折り曲げ罫線２の底面部２ｂよりも浅く、側面から見て略平坦な形状を有する溝部３を、折り曲げ罫線２の底面部２ｂに沿って長手方向に対して所定間隔に隔てて形成すると共に、その溝部３と略同等の深さを有する側面から見て滑らかな曲面形状の溝部４を、浅い溝部３，３間の底面部２ｂに沿って長手方向に対して複数形成（実施例では４個）している。
【００２４】
且つ、底面部２ｂの肉厚Ｅを、例えば略５μｍ〜略１０μｍの範囲に含まれる所定の厚さに形成する。また、溝部４の数を、例えば４個以下又は４個以上に変更してもよい。なお、プラスチックシート１の肉厚Ａや材質、強度、硬度等に応じた折り曲げ罫線２を後述する罫線刃６で付設し、その折り曲げ罫線２を、罫線刃６の刃部７，８の組み合わせや深さ、刃数等で変更することができる。
【００２５】
且つ、溝部４の幅Ａｂを、溝部３の幅Ａａよりも幅狭に設定又は図１４の（イ）に示すように略同等となる幅（略０．１５ｍｍ）に設定し、溝部３の長さＢを、略０．５ｍｍに設定し、溝部４の長さＣを、略０．８ｍｍに設定し、溝部４のピッチ間隔Ｄを、略０．２ｍｍに設定し、溝部３のピッチ間隔を、上述の溝部４のピッチ間隔Ｄよりも広い間隔に設定し、溝部３の深さＢａ及び溝部４の深さＣａを、略０．０８ｍｍに設定している。
【００２６】
且つ、プラスチックシート１の組立て作業を機械的に行う場合、前面部１ａと、側面部１ｂと、後面部１ｃと、接合部１ｄとの折り曲げ部分に形成される折り曲げ罫線２の角度θ１を、所定方向に対して折り曲げが許容される角度（略４３度）に設定し、折込み部１ｅと、上面部１ｆ及び下面部１ｇとの折り曲げ部分に形成される折り曲げ罫線２の角度θ１を、内側及び外側に対して折り曲げが許容される角度（略７５度）に設定する。
【００２７】
一方、上述の折り曲げ罫線２を付設するときに用いられるプラスチックシート用罫線刃６は、図７乃至図１０に示すように、所定角度で傾斜し相互に対峙する一対の側面部６ａと、側面部６ａ，６ａの一端側と連続する幅狭の頂面部６ｂとで略Ｖ字状に形成され、罫線刃６の頂面部６ｂよりも食込み量が浅く、側面から見て略平坦な形状を有する刃部７を、罫線刃６の頂面部６ｂに沿って長手方向に対して所定間隔に隔てて形成すると共に、その刃部７と略同等の高さを有する側面から見て滑らかな曲面形状の刃部８を、浅い刃部７，７間の頂面部６ｂに沿って長手方向に対して複数形成（実施例では４枚）している。また、深い刃部８の刃数を、例えば４枚以下又は４枚以上に変更してもよい。
【００２８】
つまり、刃部７，８を、例えば円柱ヤスリやワイヤー等の切削手段により側面から見て滑らかな曲面形状に加工すると共に、刃部８の幅Ａｂを、刃部７の幅Ａａよりも幅狭に設定又は図１４の（イ）に示すように略同等となる幅（略０．１５ｍｍ）に設定し、刃部７の長さＢを、略０．５ｍｍに設定し、刃部８の長さＣを、略０．８ｍｍに設定し、刃部８のピッチ間隔Ｄを、略０．２ｍｍに設定し、刃部７のピッチ間隔を、上述の刃部８のピッチ間隔Ｄよりも広い間隔に設定し、刃部７の深さＢａ及び刃部８の深さＣａを、略０．０８ｍｍに設定している。
【００２９】
且つ、プラスチックシート１の前面部１ａと、側面部１ｂと、後面部１ｃと、接合部１ｄとの折り曲げ部分に対して折り曲げ罫線２を形成する罫線刃６の角度θ２を略４３度に設定し、折込み部１ｅと、上面部１ｆ及び下面部１ｇとの折り曲げ部分に対して折り曲げ罫線２を形成する罫線刃６の角度θ２を略７５度に設定している。また、実施例では、罫線刃６の肉厚Ｈを、例えば略０．７ｍｍに設定しているが、この数値に限定されるものではなく、略０．７ｍｍ以下及び略０．７ｍｍ以上の肉厚Ｈに変更することもできる。
【００３０】
上記の如く構成された罫線刃６を用いて、プラスチックシート１に折り曲げ罫線２を付設する方法及びその折り曲げ罫線２が付設されたプラスチックシート１の組立て方法を説明する。
【００３１】
先ず、折り曲げ罫線２を付設する場合、プラスチック製のシートを、型本体に取り付けられた型抜き刃で型抜きするとき又は型抜きした後、図７乃至図１０に示す罫線刃６を、図１及び図１１に示すように、プラスチックシート１の前面部１ａと、側面部１ｂと、後面部１ｃと、接合部１ｄとの折り曲げ部分と、折込み部１ｅと、上面部１ｆと、下面部１ｇとの折り曲げ部分とに、そのプラスチックシート１の肉厚Ａや材質、強度、硬度等に応じた圧力で押し付けて、図３乃至図６に示す折り曲げ罫線２を、プラスチックシート１の各折り曲げ部分に形成する。
【００３２】
一方、折り曲げ罫線２が付設されたプラスチックシート１を、図２に示す側面から見て略矩形の容器形態に組立てる場合、前面部１ａと、側面部１ｂと、後面部１ｃと、接合部１ｄと、折込み部１ｅ…と、上面部１ｆ及び下面部１ｇとを折り曲げ罫線２に沿って所定の方向及び角度に折り曲げ、一方の側面部に連設した接合部１ｄと、他方の側面部１ｂとを接着剤で接着固定し、下縁側の折込み部１ｅと、上面部１ｆ及び下面部１ｇとを内側に折り曲げて閉塞する。
【００３３】
且つ、物品を収容するとき、上縁側の折込み部１ｅと、上面部１ｆ及び下面部１ｇとを一旦外側に折り曲げて開放し、物品を収容してから閉塞するので、自動製函機（図示省略）による組立て作業及び自動収容機（図示省略）による物品の収容作業が容易に行える。また、接合部１ｄを、例えば溶着や高周波溶着等により接合固定してもよい。
【００３４】
以上のように、プラスチックシート１に付設される折り曲げ罫線２の溝部３，４及び罫線刃６の刃部７，８を、プラスチックシート１の肉厚Ａに応じた割合の深さ及び高さに形成するので、プラスチックシート１に付与される面方向の応力が小さく、歪や反り、波打ち等が折り曲げ部分に発生したり、その部分に印刷された塗膜が剥離するのを防止することができる。且つ、溝部３，４の段差が小さく、滑らかであるため、プラスチックシート１の折り曲げ部分に手が接触しても、ザラツキ感が殆んどなく、触り心地が良い。また、布や皮等が引っ掛からず、折り曲げ部分の外観が美しく、意匠的に優れている。
【００３５】
且つ、折り曲げ罫線２の底面部２ｂ両側部を中心として折り曲げるので、従来例のような折り曲げ罫線の底面中央部を１箇所折り曲げるよりも裂けにくく、長い溝部３の肉厚が従来例の折り曲げ罫線よりも大きいため、折り曲げるのに必要な強度が確保され、組立て及び展開が何回でも繰り返し行えると共に、プラスチックシート１の折り曲げ作業及び組立て作業を機械的に行うことができる。
【００３６】
且つ、長さの異なる溝部３，４を複数組み合わせて形成するので、分子密度の高い部分が複数に分散され、伸び率の小さい生分解性プラスチックシートであっても、折り曲げ罫線２を簡単且つ容易に加工することができ、プラスチックシート１の肉厚Ａに応じて良好な折り曲げ特性及び柔軟性が得られる。また、プラスチックシート１を鋭角に折り曲げても裂け目や大きな孔等が発生せず、若し、孔が発生しても極小に抑えられるため、異物が侵入しにくく、商品価値や衛生度が損なわれるのを防止することができる。
【００３７】
且つ、プラスチック製のシートを型抜きするとき、罫線刃６の頂面部６ｂがプラスチックシート１に対して面待遇で押し付けられるので、押し付け位置が変位しにくく、折り曲げ罫線２を正確且つ確実に付設することができる。且つ、特定の罫線刃６が先に押し付けられても、その部分に生じる反発力により罫線刃６が押し戻され、全罫線刃６…が略均等に押し付けられる押圧姿勢及び押圧バランスに補正されるため、折り曲げ罫線２を、プラスチックシート１全体に対して略均一に付設することができる。
【００３８】
図１２は、折り曲げ罫線２及び罫線刃６の他の例を示し、図中左端の溝部３を、溝部４よりも深く、その溝部３と対向する刃部７を、刃部８よりも深くしている。中央の溝部３を、溝部４よりも深く、その溝部３と対向する刃部７を、刃部８よりも深くしている。右端の溝部３を、溝部４…の配列長さよりも長く、その溝部３と対向する刃部７を、刃部８…の配列長さよりも長くしている。その罫線刃６を用いて、プラスチックシート１に折り曲げ罫線２を形成するので、上述の実施例と略同等の作用及び効果を奏することができる。なお、溝部３及び刃部７の長さＢを、溝部４…及び刃部８…の長さＣよりも長尺に形成してもよい。また、特定の刃部７，８を有する罫線刃６を用いて、折り曲げ罫線２を形成してもよい。
【００３９】
図１３は、折り曲げ罫線２及び罫線刃６のその他の例を示し、図中左端の溝部３及び刃部７を、複数近接して配列又は切れ目や溝部により複数に分割し、中央の溝部３及び刃部７を、滑らかな曲面形状に形成し、右端の溝部３及び刃部７を、長手方向に対して段違いに形成し、その罫線刃６を用いて、プラスチックシート１に折り曲げ罫線２を形成するので、前述の実施例と略同等の作用及び効果を奏することができる。なお、何れか特定の溝部３及び刃部７を形成してもよい。
【００４０】
図１４は、折り曲げ罫線２及び罫線刃６のその他の例を示し、図中の（イ）は、溝部３，４及び刃部４，８の幅Ａａ，Ａｂを、略同等となる幅に形成している。図中の（ロ）は、溝部４及び刃部８を、罫線付設方向に対して所定角度に交差する状態に形成している。図中の（ハ）は、溝部４及び刃部８を、例えばダイヤモンド形状のような所定角度に交差する状態に形成している。上述した（イ）、（ロ）、（ハ）の罫線刃６を用いて、プラスチックシート１に折り曲げ罫線２を形成するので、前述の実施例と略同等の作用及び効果を奏することができる。
【００４１】
図１５は、折り曲げ罫線２及び罫線刃６のその他の例を示し、図中の（ニ）は、溝部３，４及び刃部７，８を、例えば梨地模様や小さい凹凸等の特異形状に形成している。つまり、溝部４の深さＣａ及び刃部８の高さＣｂと、溝部４及び刃部８のピッチ間隔Ｄとを、前述の範囲に含まれる数値に設定している。また、上述の梨地模様や小さい凹凸等を溝部３及び刃部７にも形成してもよい。
【００４２】
且つ、図中の（ホ）は、例えば略縄形状や略鎖形状等の特異形状を有する溝部４及び刃部８を、長手方向に対して１条又は複数条形成している。上述した（ニ）、（ホ）の折り曲げ罫線２を用いて、プラスチックシート１に折り曲げ罫線２を形成するので、前述の実施例と略同等の作用及び効果を奏することができる。
【００４３】
なお、上述の折り曲げ罫線２を加工する他の方法として、例えば所定温度に加熱された罫線刃６をプラスチックシート１の折り曲げ部分に押し付けて加工したり、略円板状や略ループ状の回転罫線刃（図示省略）をプラスチックシート１に押し付けながら回転させて加工することもできる。
【００４４】
且つ、折り曲げ罫線２を、例えばプラスチックシート１の折り曲げ部分に対して複数条平行して形成してもよい。また、折り曲げ罫線２を、例えばピロー型包装容器や略三角形状、略楕円形状等の様々な容器を構成するプラスチックシート１に付設してもよく、実施例の容器形態に組立てられるプラスチックシート１のみに用途が限定されるものではない。
【図面の簡単な説明】
【図１】折り曲げ罫線入りプラスチックシートを示す展開図。
【図２】プラスチックシートを容器形態に組立てた状態を示す斜視図。
【図３】プラスチックシートに形成された折り曲げ罫線を示す斜視図。
【図４】折り曲げ罫線の溝形状を示す縦断側面図。
【図５】折り曲げ罫線の溝形状を示す平面図。
【図６】折り曲げ罫線の溝形状を示す縦断端面図。
【図７】折り曲げ罫線を付設する罫線刃を示す斜視図。
【図８】罫線刃の刃部形状を示す側面図。
【図９】罫線刃の刃部形状を示す底面図。
【図１０】罫線刃の刃部形状を示す縦断端面図。
【図１１】折り曲げ罫線及び罫線刃との対向状態を示す側面図。
【図１２】折り曲げ罫線及び罫線刃の他の例を示す側面図。
【図１３】折り曲げ罫線及び罫線刃のその他の例を示す側面図。
【図１４】折り曲げ罫線及び罫線刃のその他の例を示す略平面図。
【図１５】折り曲げ罫線及び罫線刃のその他の例を示す略平面図。
【符号の説明】
Ａ…肉厚
１…プラスチックシート
２…折り曲げ罫線
２ｂ…底面部
３，４…溝部
６…罫線刃
６ｂ…頂面部
７，８…刃部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a plastic sheet with a folding ruled line and a ruled line for the plastic sheet that can satisfy the folding property and the bending strength of a plastic sheet used when assembling containers for storing articles such as cosmetics, stationery, toys and foods. Regarding the blade.
[0002]
[Prior art]
Conventionally, as a plastic sheet provided with the above-described folding ruled line, for example, a concave and convex blade part is pressed against a ruled line blade formed on the top surface of the blade edge, and a folding ruled line composed of a shallow groove part and a deep groove part is formed. A plastic sheet with a bent ruled line formed on the bent portion (Japanese Utility Model Publication No. 4-9345),
A substantially semicircular concave blade portion viewed from the side surface and a substantially straight convex blade portion pressing the ruled line blade formed on the top surface portion of the blade tip, and a substantially semicircular shallow groove portion viewed from the side surface, A folded ruled line plastic sheet (Japanese Patent Application Laid-Open No. 2001-293777) in which a folded ruled line formed of a straight deep groove is formed in the bent part;
A ruled line blade (Japanese Patent Laid-Open No. 2000-158562), which is used when a bent ruled line is attached to a plastic sheet, and is formed by intermittently cutting a blade part composed of a top surface part and an inclined part in the length direction. is there.
[0003]
[Problems to be solved by the invention]
However, if the bottom wall thickness of the folding ruled line provided by the above-mentioned ruled line blade is reduced, the folding characteristic of the plastic sheet is improved. However, if the thin part is continuous in the longitudinal direction, the plastic sheet When bent along the bent ruled line, for example, a tear or a large hole is likely to occur at the bottom of the bent ruled line. In addition, when the ruled line blade is strongly pressed against the plastic sheet and the thin part at the bottom of the folded ruled line is deliberately opened, foreign matter such as dust or moisture enters from that part, so the commercial value of the article contained in the packaging container And the hygiene level is impaired. And since the level | step difference of a groove part is large and a corner | angular part is an acute angle, the feeling of touch of a bending part is bad and cloth, skin, etc. are easily caught.
[0004]
On the other hand, if the ruled line blade is deeply cut and the thickness of the groove portion is reduced, the plastic sheet is spread out in the surface direction, so that the molecular density is increased. A sheet and a sheet having a low tensile elongation rate may tear the folding ruled line and cannot be formed into a biodegradable plastic sheet having a low elongation rate. In addition, distortion, warpage, undulation, and the like occur in the bent portion, so that the appearance and appearance deteriorate. In addition, when a plastic sheet is assembled into a container form by a box making machine, it stagnates or becomes clogged, which makes it difficult to perform assembly work mechanically.
[0005]
In addition, when the plastic sheet is punched, the sharp edge of the ruled line blade is pressed against the plastic sheet, so that the contact area between the ruled line blade and the plastic sheet is small, and the pressing position of the ruled line blade is easily displaced. Also, when a specific ruled line blade is pressed first, due to the resistance generated in the pressing part, the posture of the die-cutting body is tilted, so that the pressing balance of the ruled line blade tends to collapse, and the bent ruled line is It is difficult to attach uniformly.
[0006]
In view of the above-mentioned problems, the present invention forms a groove of a bent ruled line and a blade part of a ruled line blade to which the bent ruled line is attached at a depth and a height corresponding to the thickness of the plastic sheet, thereby achieving good folding. It is an object of the present invention to provide a plastic sheet with a folded ruled line and a ruled line blade for the plastic sheet that can obtain characteristics and flexibility, have a good touch and appearance, and can be bent mechanically.
[0007]
[Means for Solving the Problems]
This invention includes a pair of side portions facing each other and inclined at a predetermined angle, a plastic sheet concave bent borders consisting of a bottom surface portion you continuous with one end of the side surface portion (2) is attached In the bottom portion, the depth (Ba) of 20 to 50% of the thickness (A) of the plastic sheet, the width (Aa) of 5 to 50% of the thickness (A) of the plastic sheet, and the thickness (A ) And a flat groove portion (3) having a length (B) that is 1 to 20 times as long as the groove portion (3), (3), (3) ), A plurality of groove portions (4) extending in the width direction of the bent ruled line (2) or obliquely with respect to the width direction and having a deeper groove bottom depth than the flat groove (3) are bent. (2) of the ruled Plasti folding and characterized by being continuously formed in the longitudinal direction Kushito, and is used when attaching a concave bent borders against bending portion of the plastic sheet, and a pair of side portions facing each other and inclined at a predetermined angle, you continuous with one end of the side surface portion top a ruled line blade plastic sheet having a surface portion, in said top wall, 5 of the wall thickness of the plastic sheet 20 to 50% of the height of the wall thickness of the plastic sheet (a) (Bb) (a ) A flat blade portion (7) having a width (Aa) of 50% and a length (B) 1 to 20 times the thickness (A) is spaced apart in the length direction of the folded ruled line (2). The blade edge is formed between the blade portions (7) and (7) and extends in the width direction of the folded ruled line (2) or in an oblique direction with respect to the width direction, than the flat blade portion (7). Bending the plurality of blades (8) with higher heights in the length direction of the ruled line (2) Suggest plastic sheet borders blade and characterized by being formed continuously.
[0008]
The above-mentioned plastic sheet is formed of a single or composite plastic such as polypropylene (PP), polyethylene terephthalate (PET), biodegradable plastic, and the like, and has a predetermined range of about 0.1 mm to about 1 mm, for example. It is composed of a transparent or translucent sheet formed to a thickness A (for example, approximately 0.3 mm). That is, when the bent ruled line 2 is attached to the bent part of the plastic sheet 1, a single sheet or a plurality of ruled line blades 6 are attached to each bent part of the plastic sheet 1 and the material and thickness of the plastic sheet 1. It is formed by pressing with pressure according to strength, hardness, etc. and pressing while heating to a predetermined temperature.
[0009]
The groove portions 3 and 4 constituting the bent ruled line 2 and the blade portions 7 and 8 constituting the ruled line blade 6 for plastic sheet 6 are each made of plastic sheet with Aa, Ab, B, Ba, C, Ca, D, θ1, and θ2. The following numerical value can be set according to the thickness A of 1. That is, the width Aa of the groove part 3 and the blade part 7 is set to a width (for example, about 0.15 mm) included in a range of about 5% to about 50% with respect to the thickness A of the plastic sheet 1, for example. The width Ab of the blade portion 8 is set to a width (for example, about 0.15 mm) included in a range of about 5% to about 55% with respect to the thickness A of the plastic sheet 1, for example.
[0010]
And the length B of the groove part 3 and the blade part 7 is set to the width (for example, about 0.5 mm) included in the range of about 1 to about 20 times the thickness A, for example, and the groove part 4 and the blade part. 8 is set to a width (for example, about 0.8 mm) included in a range of about 2 times to about 20 times the thickness A, for example, and the pitch interval D between the groove portion 4 and the blade portion 8 is set to For example, an interval (for example, approximately 0.2 mm) included in a range of approximately 10% to approximately 200% with respect to the thickness A is set, and the pitch interval between the groove 3 and the blade 7 is set to the above-described groove 4 and blade 8. An interval wider than the pitch interval D is set.
[0011]
And the depth Ba of the groove part 3 and the height Bb of the blade part 7 are set to a width (for example, approximately 0.08 mm) included in a range of approximately 20% to approximately 50% with respect to the thickness A, for example, The depth Ca of 4 and the height Cb of the blade portion 8 are set to a width (for example, about 0.08 mm) included in a range of about 10% to about 400% with respect to the thickness A, for example.
[0012]
Further, the angle θ1 of the folded ruled line 2 and the angle θ2 of the ruled line blade 6 are set to an angle included in a range of approximately 15 degrees to approximately 120 degrees, for example, depending on the folded portion of the plastic sheet 1. That is, the angle θ1 of the bent ruled line 2 and the angle θ2 of the ruled line blade 6 formed at the bent portions of the front surface portion 1a, the side surface portion 1b, the rear surface portion 1c, and the joint portion 1d of the plastic sheet 1 are set to about 43 degrees. The angle θ1 of the folded ruled line 2 and the angle θ2 of the ruled line blade 6 formed at the bent part of the folded portion 1e, the upper surface portion 1f, and the lower surface portion 1g are set to approximately 75 degrees.
[0013]
When the pitch interval D is larger than the set value, the cutting edge strength of the ruled line blade 6 is lowered, and the folding characteristic of the plastic sheet 1 is deteriorated. Further, if the pitch interval D is smaller than the set value, the strength of the cutting edge is lowered, and a sufficient effect for attaching the folding ruled line 2 cannot be obtained. Therefore, it is preferable to set the value within the above range. .
[0014]
Moreover, when Aa, Ab, B, Ba, C, and Ca are set larger than the set values, the feel and folding characteristics of the folded ruled lines 2 attached to the plastic sheet 1 are deteriorated. Further, if the value is smaller than the set value, the strength of the blade edge is lowered, and a sufficient effect for attaching the folding ruled line 2 cannot be obtained. Therefore, it is preferable to set the value within the above range.
[0015]
In addition, when the biting angle θ2 of the ruled line blade 6 is increased, a large pressing force is required when attaching the bent ruled line 2, and the processing is difficult. The plastic sheet 1 is warped or wavy, and it is difficult to bend mechanically. The bending characteristic of the plastic sheet 1 is deteriorated. Further, if the angle θ2 is made smaller than the set value, the strength of the cutting edge is lowered and the life is shortened. Therefore, it is preferable to set the value within the above range.
[0016]
If it is a numerical value included in the above-mentioned range, depending on the thickness A, material, strength, hardness, etc. of the plastic sheet 1, the widths of the groove portions 3, 4 of the bent ruled line 2 and the blade portions 7, 8 of the ruled line blade 6 The length, depth, height, interval (pitch), angle and the like can be changed and set to a desired arrangement and combination. Further, for example, it may be formed into a specific curved surface shape, a substantially semicircular shape, a substantially arc shape, a substantially fan shape or a substantially trapezoidal shape, a substantially square shape, a substantially triangular shape, or the like, or a shape obtained by combining a plurality of shapes. it can.
[0017]
Further, the groove portions 3 and 4 of the bent ruled line 2 and the blade portions 7 and 8 of the ruled line blade 6 are arranged, for example, in a plurality of proximity or division, formed into a smooth curved surface shape, formed in steps, or substantially the same. Or it can be formed in different widths and intersecting states. Further, for example, it can be formed into a peculiar shape such as a satin pattern, a small unevenness, a substantially rope shape, or a substantially chain shape.
[0018]
As an embodiment, the groove portion can be formed to have substantially the same or different depth. Moreover, the said blade part can be formed in substantially the same or different height. Moreover, the said groove part and blade part can be formed in a smooth curved surface shape. Moreover, each part of the said groove part can be set to the dimension contained in the predetermined range suitable for bending according to the thickness of the said plastic sheet. Moreover, each part of the said blade part can be set to the dimension contained in the predetermined range suitable for forming the said bending ruled line according to the thickness of the said plastic sheet.
[0019]
[Action and effect]
According to the present invention, the groove portion of the folded ruled line and the blade portion of the ruled line blade to which the folded ruled line is attached are formed at a depth and height corresponding to the thickness of the plastic sheet, so that it is applied to the plastic sheet. The stress in the surface direction is small, and it is possible to prevent distortion, warpage, undulation, etc., and the coating film printed on the portion from peeling off. In addition, since the difference in level of the groove is small and smooth, even if the hand touches the bent portion of the plastic sheet, there is almost no roughness and the touch is good. In addition, cloth and leather are not caught, the appearance of the bent portion is beautiful, and the design is excellent.
[0020]
And since it is bent centering on both side portions of the bottom surface of the folded ruled line, it is more difficult to tear than folding the central part of the bottom of the folded ruled line as in the conventional example, and the wall thickness of the long groove is larger than the folded ruled line of the conventional example. In addition, the strength necessary for bending is ensured, the assembly and deployment can be repeated any number of times, and the bending and assembly operations can be mechanically performed.
[0021]
In addition, since a plurality of groove portions having different lengths are formed in combination, even when a biodegradable plastic sheet having a high molecular density is dispersed and has a low elongation rate, the folding ruled line can be processed easily and easily. Depending on the thickness of the plastic sheet, good folding characteristics and flexibility can be obtained. In addition, even if the plastic sheet is bent at an acute angle, no cracks or large holes are generated, and even if holes are generated, it can be kept to a minimum, so that foreign objects are less likely to enter and the product value and hygiene level are impaired. Can be prevented.
[0022]
【Example】
An embodiment of the present invention will be described in detail with reference to the drawings.
The drawing shows a plastic sheet with a folding ruled line used when assembling a packaging container that accommodates articles, and a ruled line blade for a plastic sheet to which a folding ruled line is attached. In FIG. It is composed of a transparent or semi-transparent plastic sheet having a thickness of about 3 mm, and the plastic sheet is roughly cut as viewed from the front after being punched or punched into a shape in which a packaging container (see FIG. 2) is developed. Left and right side surfaces 1b connected to both side edges of the front surface 1a having a rectangular shape, a rear surface 1c connected to the right edge of one side 1b, and a connection connected to the right edge of the rear surface 1c 1d, a folded portion 1e connected to the upper and lower edges of the side surface 1b, an upper surface 1f connected to the upper edge of the front surface 1a, a lower surface 1g connected to the lower edge, and an upper surface 1f and bottom The folding portion between the folding portion 1h which is continuously provided in 1g, to form a concave bent border 2 by ruled blade 6 to be described later. Moreover, you may provide the hole (illustration omitted) for suspending the plastic sheet 1 assembled in the container form in the support part (illustration omitted) connected with the upper edge part of the rear surface part 1c.
[0023]
As shown in FIGS. 3 to 6, the folding ruled line 2 attached to the bent portion of the plastic sheet 1 includes a pair of side surface portions 2a that are inclined at a predetermined angle and face each other, and one ends of the side surface portions 2a and 2a. A groove portion 3 that is formed in a substantially V shape with a bottom surface portion 2b that is continuous with the side and that is shallower than the bottom surface portion 2b of the folded ruled line 2 and has a substantially flat shape when viewed from the side surface is formed on the bottom surface portion 2b of the folded ruled line 2 Along the longitudinal direction at a predetermined interval, and a groove portion 4 having a smooth curved surface when viewed from a side surface having a depth substantially equal to the groove portion 3 is formed as a bottom surface portion 2b between the shallow groove portions 3 and 3. A plurality of (four in the embodiment) are formed along the longitudinal direction.
[0024]
In addition, the thickness E of the bottom surface portion 2b is formed to a predetermined thickness included in a range of about 5 μm to about 10 μm, for example. Moreover, you may change the number of the groove parts 4 to 4 or less, for example, or 4 or more. A bent ruled line 2 corresponding to the thickness A, material, strength, hardness and the like of the plastic sheet 1 is attached by a ruled line blade 6 described later, and the bent ruled line 2 is combined with the blade portions 7 and 8 of the ruled line blade 6 or It can be changed by depth, number of blades, etc.
[0025]
Further, the width Ab of the groove portion 4 is set to be narrower than the width Aa of the groove portion 3 or set to a substantially equal width (approximately 0.15 mm) as shown in FIG. The length B is set to about 0.5 mm, the length C of the groove 4 is set to about 0.8 mm, the pitch interval D of the groove 4 is set to about 0.2 mm, and the pitch interval of the groove 3 is set. The pitch is set to be wider than the pitch interval D of the groove 4 described above, and the depth Ba of the groove 3 and the depth Ca of the groove 4 are set to about 0.08 mm.
[0026]
When the assembly work of the plastic sheet 1 is mechanically performed, the angle θ1 of the folding ruled line 2 formed at the bent portion of the front surface portion 1a, the side surface portion 1b, the rear surface portion 1c, and the joint portion 1d is set to a predetermined value. The angle θ1 of the folding ruled line 2 formed at the bent portion between the folding portion 1e, the upper surface portion 1f, and the lower surface portion 1g is set to an angle (approximately 43 degrees) at which bending is allowed with respect to the direction. Is set to an angle (approximately 75 degrees) at which bending is allowed.
[0027]
On the other hand, as shown in FIGS. 7 to 10, a plastic sheet ruled line blade 6 used when attaching the above-described bent ruled line 2 is composed of a pair of side surface parts 6a that are inclined at a predetermined angle and face each other. 6a, a blade having a substantially flat shape when viewed from the side, formed in a substantially V shape with a narrow top surface portion 6b continuous with one end side, and having a shallower bite than the top surface portion 6b of the ruled blade 6 The portion 7 is formed at a predetermined interval with respect to the longitudinal direction along the top surface portion 6b of the ruled line blade 6 and is a blade having a smooth curved surface when viewed from a side surface having substantially the same height as the blade portion 7. A plurality of portions 8 are formed in the longitudinal direction along the top surface portion 6b between the shallow blade portions 7 and 7 (four in the embodiment). Moreover, you may change the number of the blades of the deep blade part 8 to 4 sheets or less, or 4 sheets or more, for example.
[0028]
That is, the blade portions 7 and 8 are machined into a smooth curved shape when viewed from the side by a cutting means such as a cylindrical file or a wire, and the width Ab of the blade portion 8 is narrower than the width Aa of the blade portion 7. Or set to a substantially equivalent width (approximately 0.15 mm) as shown in FIG. 14A, the length B of the blade portion 7 is set to approximately 0.5 mm, and the length of the blade portion 8 is set. Is set to approximately 0.8 mm, the pitch interval D of the blade portion 8 is set to approximately 0.2 mm, and the pitch interval of the blade portion 7 is wider than the pitch interval D of the blade portion 8 described above. The depth Ba of the blade portion 7 and the depth Ca of the blade portion 8 are set to approximately 0.08 mm.
[0029]
In addition, the angle θ2 of the ruled line blade 6 that forms the folded ruled line 2 with respect to the bent part of the front surface portion 1a, the side surface portion 1b, the rear surface portion 1c, and the joint portion 1d of the plastic sheet 1 is set to about 43 degrees. The angle θ2 of the ruled line blade 6 that forms the bent ruled line 2 with respect to the bent part of the folded part 1e, the upper surface part 1f, and the lower surface part 1g is set to approximately 75 degrees. In the embodiment, the thickness H of the ruled line blade 6 is set to, for example, approximately 0.7 mm. However, the thickness H is not limited to this value, and is approximately 0.7 mm or less and approximately 0.7 mm or more. The thickness can be changed to H.
[0030]
A method of attaching the bent ruled line 2 to the plastic sheet 1 using the ruled line blade 6 configured as described above and a method of assembling the plastic sheet 1 provided with the bent ruled line 2 will be described.
[0031]
First, when the folding ruled line 2 is attached, when the plastic sheet is die-cut by the die-cutting blade attached to the die body or after the die-cutting, the ruled-line blade 6 shown in FIGS. As shown in FIG. 11, the front portion 1 a, the side surface portion 1 b, the rear surface portion 1 c, the bent portion of the joining portion 1 d, the folding portion 1 e, the upper surface portion 1 f, and the lower surface portion 1 g of the plastic sheet 1. The folded ruled lines 2 shown in FIG. 3 to FIG. To do.
[0032]
On the other hand, when the plastic sheet 1 provided with the folding ruled line 2 is assembled into a substantially rectangular container shape when viewed from the side surface shown in FIG. 2, the front surface portion 1a, the side surface portion 1b, the rear surface portion 1c, and the joint portion 1d The bent portion 1e, the upper surface portion 1f and the lower surface portion 1g are bent in a predetermined direction and angle along the folding ruled line 2, and the joint portion 1d continuously provided on one side surface portion and the other side surface portion 1b are connected. The lower edge side folded portion 1e, the upper surface portion 1f, and the lower surface portion 1g are folded inward and closed.
[0033]
Further, when the article is accommodated, the folding portion 1e on the upper edge side, the upper surface portion 1f and the lower surface portion 1g are once bent outward to be opened and closed after the article is accommodated. ) And assembly work by an automatic storage machine (not shown) can be easily performed. Further, the joining portion 1d may be joined and fixed by, for example, welding or high-frequency welding.
[0034]
As described above, the groove portions 3 and 4 of the bent ruled line 2 attached to the plastic sheet 1 and the blade portions 7 and 8 of the ruled line blade 6 are made to have a depth and a height corresponding to the thickness A of the plastic sheet 1. Since it is formed, the stress in the surface direction applied to the plastic sheet 1 is small, and distortion, warpage, undulation, etc. can be prevented from occurring in the bent portion, and the coating film printed on that portion can be prevented from peeling off. . And since the level | step difference of the groove parts 3 and 4 is small and smooth, even if a hand contacts the bending part of the plastic sheet 1, there is almost no rough feeling and a touch feeling is good. In addition, cloth and leather are not caught, the appearance of the bent portion is beautiful, and the design is excellent.
[0035]
In addition, since it is folded around both sides of the bottom surface 2b of the folding ruled line 2, it is more difficult to tear than folding the central part of the bottom of the folded ruled line as in the conventional example, and the thickness of the long groove 3 is larger than that of the conventional folded ruled line. Therefore, the strength necessary for bending is ensured, the assembly and deployment can be repeated any number of times, and the plastic sheet 1 can be bent and assembled mechanically.
[0036]
In addition, since a plurality of groove portions 3 and 4 having different lengths are formed in combination, even when the biodegradable plastic sheet has a high molecular density and is dispersed in a plurality, and the elongation rate is small, the folding ruled line 2 is simple and easy. In accordance with the thickness A of the plastic sheet 1, good bending characteristics and flexibility can be obtained. Further, even when the plastic sheet 1 is bent at an acute angle, no rift or large hole is generated, and even if the hole is generated, it is suppressed to a minimum, so that foreign matter is less likely to enter, and the commercial value and hygiene are impaired. Can be prevented.
[0037]
In addition, when the plastic sheet is punched, the top surface portion 6b of the ruled line blade 6 is pressed against the plastic sheet 1 by surface treatment, so that the pressing position is not easily displaced, and the bent ruled line 2 is attached accurately and reliably. be able to. In addition, even if the specific ruled line blade 6 is pressed first, the ruled line blade 6 is pushed back by the repulsive force generated in that portion, and the pressing posture and the press balance are pressed so that all the ruled line blades 6 are pressed almost evenly. The bent ruled line 2 can be provided substantially uniformly on the entire plastic sheet 1.
[0038]
FIG. 12 shows another example of the folded ruled line 2 and the ruled line blade 6. In the drawing, the leftmost groove part 3 is deeper than the groove part 4, and the blade part 7 facing the groove part 3 is made deeper than the blade part 8. ing. The central groove 3 is deeper than the groove 4, and the blade 7 facing the groove 3 is deeper than the blade 8. The groove 3 at the right end is longer than the arrangement length of the grooves 4... And the blade 7 facing the groove 3 is longer than the arrangement length of the blades 8. Since the folded ruled line 2 is formed on the plastic sheet 1 using the ruled line blade 6, it is possible to achieve substantially the same operations and effects as the above-described embodiment. In addition, you may form the length B of the groove part 3 and the blade part 7 longer than the length C of the groove part 4 ... and the blade part 8 .... Further, the folded ruled line 2 may be formed using a ruled line blade 6 having specific blade portions 7 and 8.
[0039]
FIG. 13 shows another example of the folded ruled line 2 and the ruled line blade 6, and the groove part 3 and the blade part 7 at the left end in the figure are divided into a plurality by a plurality of adjacent arrangements or cuts or grooves, and the center groove part 3 and The blade portion 7 is formed in a smooth curved surface shape, the groove portion 3 and the blade portion 7 at the right end are formed stepwise with respect to the longitudinal direction, and the folded ruled line 2 is formed on the plastic sheet 1 using the ruled line blade 6 Therefore, it is possible to achieve substantially the same operation and effect as the above-described embodiment. Any specific groove 3 and blade 7 may be formed.
[0040]
FIG. 14 shows another example of the folded ruled line 2 and the ruled line blade 6. In FIG. 14, (a) shows that the widths Aa and Ab of the groove parts 3 and 4 and the blade parts 4 and 8 are formed to be substantially equal widths. is doing. (B) in the figure forms the groove 4 and the blade 8 in a state intersecting with a predetermined angle with respect to the ruled line attaching direction. In (c) in the figure, the groove 4 and the blade 8 are formed so as to intersect at a predetermined angle such as a diamond shape. Since the folded ruled line 2 is formed on the plastic sheet 1 using the ruled line blades 6 of (A), (B), and (C) described above, operations and effects substantially equivalent to those of the above-described embodiment can be achieved.
[0041]
FIG. 15 shows another example of the folded ruled line 2 and the ruled line blade 6, and (D) in the figure shows that the groove parts 3, 4 and the blade parts 7, 8 are formed in a specific shape such as a satin pattern or small unevenness, for example. is doing. That is, the depth Ca of the groove portion 4 and the height Cb of the blade portion 8 and the pitch interval D between the groove portion 4 and the blade portion 8 are set to numerical values included in the aforementioned range. Further, the above-described satin pattern or small unevenness may be formed on the groove portion 3 and the blade portion 7.
[0042]
Moreover, (e) in the figure forms one or more grooves 4 and blades 8 having a specific shape such as a substantially rope shape or a substantially chain shape in the longitudinal direction. Since the folded ruled line 2 is formed on the plastic sheet 1 using the above-described folded ruled line 2 of (d) and (e), it is possible to achieve substantially the same operations and effects as the above-described embodiment.
[0043]
In addition, as another method for processing the bent ruled line 2 described above, for example, a ruled line blade 6 heated to a predetermined temperature is pressed against a bent part of the plastic sheet 1 or processed, or a substantially disc-shaped or substantially loop-shaped rotating ruled line. The blade (not shown) can be processed by rotating while pressing against the plastic sheet 1.
[0044]
Further, a plurality of folding ruled lines 2 may be formed in parallel with the folded portion of the plastic sheet 1, for example. Further, the folding ruled line 2 may be attached to a plastic sheet 1 constituting various containers such as a pillow type packaging container, a substantially triangular shape, and a substantially elliptical shape, for example, and only the plastic sheet 1 assembled in the container form of the embodiment. The application is not limited to the above.
[Brief description of the drawings]
FIG. 1 is a development view showing a plastic sheet with folded ruled lines.
FIG. 2 is a perspective view showing a state in which a plastic sheet is assembled in a container form.
FIG. 3 is a perspective view showing bent ruled lines formed on a plastic sheet.
FIG. 4 is a longitudinal side view showing a groove shape of a bent ruled line.
FIG. 5 is a plan view showing a groove shape of a bent ruled line.
FIG. 6 is a longitudinal end view showing a groove shape of a bent ruled line.
FIG. 7 is a perspective view showing a ruled line blade for attaching a bent ruled line.
FIG. 8 is a side view showing a blade shape of a ruled line blade.
FIG. 9 is a bottom view showing a blade shape of a ruled line blade.
FIG. 10 is a longitudinal end view showing a blade shape of a ruled line blade.
FIG. 11 is a side view showing a state of facing a bent ruled line and a ruled line blade.
FIG. 12 is a side view showing another example of a folded ruled line and a ruled line blade.
FIG. 13 is a side view showing another example of a folded ruled line and a ruled line blade.
FIG. 14 is a schematic plan view showing another example of a folded ruled line and a ruled line blade.
FIG. 15 is a schematic plan view showing another example of a folded ruled line and a ruled line blade.
[Explanation of symbols]
A ... Thickness 1 ... plastic sheet 2 ... bending ruled line 2b ... bottom part 3, 4 ... groove part 6 ... ruled line blade 6b ... top face part 7,8 ... blade part

Claims

A pair of side portions facing each other and inclined at a predetermined angle, a plastic sheet concave bent border (2) is attached consisting of a bottom surface portion you continuous with one end of the side surface portion,
In the bottom portion, the depth (Ba) of 20 to 50% of the thickness (A) of the plastic sheet, the width (Aa) of 5 to 50% of the thickness (A) of the plastic sheet, and the thickness (A) And forming a flat groove (3) having a length (B) of 1 to 20 times the length of the bent ruled line (2) at an interval,
Between the groove portions (3) and (3), a plurality of grooves having a deeper groove bottom depth than the flat groove portion (3) extending in the width direction of the folding ruled line (2) or obliquely with respect to the width direction. A plastic sheet with a folded ruled line , characterized in that the groove part (4) is continuously formed in the length direction of the folded ruled line (2) .

Is used when attaching a concave bent borders against bending portion of the plastic sheet, has a pair of side portions facing each other and inclined at a predetermined angle, and a top wall you continuous with one end of the side surface portion A ruled line blade for plastic sheets,
In the top surface portion , the height (Bb) of 20 to 50% of the thickness (A) of the plastic sheet, the width (Aa) of 5 to 50% of the thickness (A) of the plastic sheet, and the thickness (A ) And a flat blade portion (7) having a length (B) 1 to 20 times as long as that of the bent ruled line (2).
Between the blade portions (7) and (7), a plurality of blade edges having a height higher than that of the flat blade portion (7) extending in the width direction of the bent ruled line (2) or obliquely with respect to the width direction. A ruled line blade for plastic sheets , wherein the blade part (8) is continuously formed in the length direction of the bent ruled line (2) .