【０００１】
【発明の属する技術分野】
本発明は、ラップフィルムやアルミホイルなどの食品包装用フィルムが収納されるフィルム収納箱に関する。特に、使用中はフィルムのカット性能を維持する収納箱強度を有し、使用後の空箱廃棄時には容易に鋸刃を取り外すことを可能にするフィルム収納箱に関する。
【０００２】
【従来の技術】
図４の立体図に示す様な前板（１）、底板（２）、後板（３）、脇板（８）、補助脇板（９）、（９′）の各面からなる上部が開口した収納室（１２）と、蓋板（４）、掩蓋片（５）、掩蓋片脇板（１０）、掩蓋片補助脇板（１１）の各面からなる収納室を覆う方向に連接した開閉可能な蓋体（１３）とで形成され、掩蓋片（５）の先端縁部に刃先が先端縁部からはみ出す状態で鋸刃（Ｋ）が固定してあり、フィルム巻筒体（Ｒ）が収納される、直方体をしたフィルム収納箱がよく知られている。この種のフィルム収納箱は、前板（１）に糊付けされている開封片（６）を引き剥がし、蓋体（１３）を開け、フィルム（Ｆ）の端部を指で摘み、必要量引き出して、掩蓋片先端に刃先がはみ出す状態で固定してある鋸刃（Ｋ）でフィルムをカットして用いるものである。フィルム収納箱の材質としては、板紙、ダンボールなどさまざまである。又、鋸刃（Ｋ）の材質としては、金属、紙、樹脂などさまざまであり、又形状としては、直線状、Ｖ字状、曲線状などさまざまなものが知られている。鋸刃のフィルム収納箱への取り付け方法としては、金属製の場合はカシメ爪（Ｔ）による固定、紙や樹脂の場合は接着剤や超音波接着による固定が知られている。
【０００３】
この種のフィルム収納箱は、板紙製の収納箱に金属製鋸刃が取り付けられているものが一般的であるが、近年、環境問題への対応として非金属製鋸刃も徐々に実用化されている。金属製鋸刃を取り付けたフィルム収納箱はカット性能が良好であるが廃棄の際には分別する必要がある。又、非金属製鋸刃を取り付けたフィルム収納箱は、分別廃棄の必要はないがカット性能に問題がある。
フィルム収納箱から金属製鋸刃を取り外し可能にする工夫として、切り込み線をフィルム収納箱の一部に形成し、フィルム収納箱の一部を切り取ることで鋸刃を取り外す方式が提案されている。この方式には、図５に示す実開昭６０−１９５７３５号公報のように鋸刃近傍にミシン目を設け、その部分を指で押し開け舌状挟着片１５（以下、指穴状摘み代という）としこれを摘んで鋸刃を取り外す方式や、図６に示す特開平６−３４５０７９号公報のようにフィルム収納箱にミシン目によって切り取り可能となる部分１６（以下、ミシン目分離状摘み代という）を設けその部分をミシン目に沿って切り鋸刃を取り外す方式がある。しかしながら、これらの様にフィルム収納箱にミシン目等により切り取り部分を形成するものは、鋸刃を取り外し易くするために切り込み線を多用すればフィルム収納箱の強度が低下する。特に鋸刃近傍に切り込み線を入れるため、フィルムをカットする際の力に耐え切れずカット性能が低下する。又、これらの方式は取り外した際に鋸刃が螺旋状に大きくカールし廃棄し難くなる場合がある。
【０００４】
カット性能を向上させた非金属製の鋸刃として、実開平１−１２８５２４号公報ではロックウェル硬度が９０以上１３０以下の繊維状補強樹脂刃、又特開平５−１６２７４７号公報ではロックウェル硬度が９０以上１２０以下のバルカナイズドファイバー刃が提案されている。これらの非金属製鋸刃は、ロックウェル硬度を高めてフィルムのカット性能を向上させているものの金属製鋸刃には及ばない。又、収納箱を古紙としてリサイクルする際には、これらは通常の紙類より硬度を高めているため、取り外しにくいという問題があった。
【０００５】
【発明が解決しようとする課題】
本発明は、良好なフィルムのカット性能と廃棄性を両立させたフィルム収納箱を提供することを目的とする。
【０００６】
【課題を解決するための手段】
本発明者らは、上記課題を達成するために鋭意検討した結果、本発明をなすに至った。すなわち本発明は以下の通りである。
１）前板（１）、底板（２）、後板（３）、脇板（８）、補助脇板（９）、（９′）の各面からなる上部が開口した収納室（１２）と、蓋板（４）、掩蓋片（５）、掩蓋片脇板（１０）、掩蓋片補助脇板（１１）の各面からなる収納室を覆う方向に連接した開閉可能な蓋体（１３）とで形成され、掩蓋片（５）の先端縁部に刃先が先端縁部からはみ出す状態で鋸刃（Ｋ）が固定してあり、フィルム巻筒体（Ｒ）が収納される直方体をしたフィルム収納箱であって、掩蓋片（５）に鋸刃（Ｋ）を取り外すための切り取り線で囲まれた切り取り部（１４）が形成されており、該鋸刃（Ｋ）が、ロックウェル硬度が４６以上７３以下で厚みが０．１ｍｍ以上０．２ｍｍ以下の金属製であることを特徴とするフィルム収納箱。
【０００７】
２）該切り取り部（１４）が、掩蓋片（５）のフィルム収納箱幅方向の端部からの距離（Ｘ）が１ｍｍ以上５ｍｍ以下、掩蓋片（５）の先端縁部からの距離（Ｙ）が２ｍｍ以上５ｍｍ以下の位置から開始し、鋸刃（Ｋ）の掩蓋片（５）の先端縁部からはみ出していない他方の先端近傍で終了する、蓋板（４）方向に凸状の円弧又は直線の組み合わせからなる切り取り線で囲まれていることを特徴とする１）記載のフィルム収納箱。
３）該切り取り線が、繋ぎ部分（切れていない部分）／破線部分（貫通した切れ目）の値が１／７以上１／２以下のミシン目状であることを特徴とする１）または２）記載のフィルム収納箱。
本発明は、鋸刃の材質、硬度、厚みを規定し、更に切り取り部を設けることにより、使用中はフィルム収納箱としての機能、特にフィルムのカット性を維持しつつ、使用後は、容易に鋸刃をフィルム収納箱から取り外すことを可能にし廃棄性を向上させた。
【０００８】
【発明の実施の形態】
以下、図を用いて本発明について、特にその好ましい実施態様を中心にさらに詳細に説明する。図１、２は、本発明の一実施例を示すもので、図１はフィルム収納箱の立体模式図、図２はその展開図である。図３は切り取り部（１４）の拡大図であり、切り取り部の開始位置、掩蓋片（５）のフィルム収納箱幅方向の端部からの距離（Ｘ）と、掩蓋片（５）の先端縁部からの距離（Ｙ）を示す。図４は従来のフィルム収納箱を示す立体模式図である。図５は鋸刃が前板の上縁部に固定されたフィルム収納箱における従来技術の一例で、鋸刃の近傍にミシン目による分離部分（１５）を設定し、その部分を指で押し開き指穴状摘み代とするフィルム収納箱の部分拡大図である。図６は、掩蓋片脇板と掩蓋片補助脇板の少なくとも一方から掩蓋片の一部にかけてミシン目によって切り取り可能となる部分（１６）を設けてミシン目分離状摘み代とする従来技術のフィルム収納箱の部分拡大図である。
【０００９】
図１と図４で示すとおり、本発明のフィルム収納箱は従来のフィルム収納箱と基本構造は同じである。つまり、前板（１）、底板（２）、後板（３）、及び脇板（８）、補助脇板（９）、（９′）の各面で形成される上部が開口し、巻筒体（Ｒ）を収納する収納室（１２）と、その収納室（１２）の後板（３）の上端縁から開閉可能で収納室（１２）を覆う方向に連接した蓋板（４）と、その蓋板（４）の前端縁から前板（１）を覆う方向に延出した掩蓋片（５）と、掩蓋片脇板（１０）、掩蓋片補助脇板（１１）の各面で形成される蓋体（１３）からなる直方体状のフィルム収納箱である。このフィルム収納箱には、フィルム（Ｆ）をカットするための鋸刃（Ｋ）が配備され、収納室（１２）に収納された巻筒体（Ｒ）から必要量のフィルムが引き出されカットして使用される。
【００１０】
本発明に使用される鋸刃は、ＪＩＳ Ｚ ２２４５に準拠したロックウェル硬度（ＨＲ３０Ｔ）が４６以上７３以下の金属製である。ロックウェル硬度が４６以上７３以下のものは、取り外した際に鋸刃が螺旋状に大きくカールすることもなく廃棄し易いし、カシメ爪による鋸刃の取り付けにも問題はない。４６未満のものは廃棄のし易さには問題はないが、材質が柔らかいのでカシメ爪の板紙への突き刺し性に問題があるものもある。又、７３を超えるものは、材質が硬いのでカシメ爪の板紙への突き刺し性に問題はないが、取り外した際に鋸刃が螺旋状に大きくカールする場合がある。ロックウェル硬度（ＨＲ３０Ｔ）が４６以上６０以下のものは廃棄のし易さ、カシメ爪の突き刺し性が調和して更に好ましい。
【００１１】
この金属製鋸刃の厚みは０．１ｍｍ以上０．２ｍｍ以下である。この範囲のものはカット性能と廃棄のし易さのバランスが取れており、上下の金型で打ち抜くタイプの刃付け機の場合、金型の磨耗や耐久性が十分あり打ち抜いた後の歯型の精度が良くカット性能を維持する。０．１５ｍｍ以上０．１８ｍｍ以下のものは歯型の精度が特に良く更に好ましい。
金属刃に用いられる金属は、特に制限はないが板紙製収納箱へのカシメ爪による固定のためのカシメピンによる穿孔性、カシメ爪の板紙への突き刺し性などの点からブリキ材が好ましい。鋸刃の全体形状は直線状、Ｖ状、湾曲状等従来公知のものであれば特に制限はなく、歯山の形状も従来公知のもので良い。
【００１２】
本発明の鋸刃取り外し用の切り取り部（１４）は、掩蓋片（５）のフィルム収納箱幅方向の端部からの距離（Ｘ）が１ｍｍ以上５ｍｍ以下、掩蓋片（５）の先端縁部からの距離（Ｙ）が２ｍｍ以上５ｍｍ以下の位置から開始するものが好ましい。図３にＸ、Ｙを示す。Ｘが１ｍｍ未満やＹが２ｍｍ未満のものは、鋸刃を取り外す際の切り取り部の抵抗が少なくスムーズに切り取れるが、一方でフィルムのカットを繰り返すと鋸刃のフィルム収納箱幅方向の端部に繰り返し荷重がかかり、ミシン目部分に折れ曲がりやちぎれが発生しやすく、その影響で鋸刃近傍のフィルム収納箱強度が低下し、カットの際に鋸刃を取り付けているフィルム収納箱幅方向の掩蓋片の端部が不安定になりカット性が低下する場合がある。又、Ｘが５ｍｍを超えるものやＹが５ｍｍを超えるものは、フィルムのカットを繰り返しても収納箱の強度に変化は見られないが、一方で鋸刃を取り外す際の切り取り部の抵抗が大きく取り外し難い場合がある。
【００１３】
切り取り部は、前記位置から開始し、鋸刃（Ｋ）の掩蓋片（５）の先端縁部からはみ出していない他方の先端近傍で終了することが好ましい。こうすることにより、鋸刃の取り外し途中に切り取り部が鋸刃から外れることがなく、鋸刃の切り取り方向が他方の先端に沿って定まり安定した切り取りを実現し確実に鋸刃の取り外しが完了する。他方の先端から大きく蓋板（４）方向へずれたところで終了したものは、切り取りが安定せず収納箱を破壊しやすい。又、他方の先端ではなく掩蓋片の先端縁部に近づき過ぎて終了したものは鋸刃の切り取りが終了する前に切り取り部がちぎれて鋸刃から分離してしまう場合がある。
【００１４】
切り取り部の形状は、蓋板（４）方向に凸状の円弧又は直線の組み合わせからなる切り取り線で囲まれていることが好ましい。その部分を指で押し開き摘み代とすれば、指先に十分な切り取り力が伝達できるものであれば形状は、コの字状、台形状、三角形状等特に制限はなく、掩蓋片の片側のみ或いは両側に設置しても構わない。
切り取り線は、繋ぎ部分（切れていない部分）／破線部分（貫通した切れ目）の値が１／７以上１／２以下が更に好ましい。繋ぎ部分の割合が１／７未満の場合は、カット性能に影響はないがミシン目に沿って指で切り取り部を押し開く際の抵抗が大きくなりやすい。又、１／２を超える場合は、ミシン目に沿って指で切り取り部を押し開く際の抵抗は小さいが、収納箱の強度が低下しやすい。
【００１５】
本発明のフィルム収納箱に使用される材質としては、坪量１００〜６００ｇ／ｍ２の板紙、ＧフルートやＦフルート等の各種段ボール、プラスチック成型品等特に制限はないが、板紙製の場合は板紙を切り取ることで鋸刃を取り外す場合は、カット性維持の点から坪量３００ｇ／ｍ２以上、また鋸刃を取り外す際に板紙を切り取り易くする点から６００ｇ／ｍ２以下の板紙が好ましい。３００ｇ／ｍ２未満の場合は、板紙を引きちぎる際にあまり力が要らないが、収納箱の強度が不十分となりやすく、フィルム収納箱としての機能、特にカット性が低下しやすい。又、６００ｇ／ｍ２を超える場合は、収納箱の強度は十分でフィルム収納箱としての機能、特にカット性は低下しないが、鋸刃を切り取ろうとして板紙を引きちぎる際に力を要する場合がある。
【００１６】
本発明のフィルム収納箱は、高さ方向、奥行き方向の長さは特に制限はなく、従来よく使用されている４０〜６０ｍｍのものが好ましく、幅方向は１５〜４５ｃｍのフィルムを巻いた巻筒体が収納できるものが好ましい。
本発明のフィルム収納箱に収納されるフィルムは、各種樹脂製ラップフィルム、アルミホイル、クッキングペーパー等特に制限はないが、塩化ビニリデン系フィルムは引き裂き伝播強度が小さく金属鋸刃との組み合わせは非常に好評であり好ましい。
次に、本発明を実施例に基づき詳しく説明する。なお、本発明に用いる評価の方法と評価基準について以下に示す。
【００１７】
《カット性》
フィルム収納箱にフィルム巻筒体を収納し、フィルムを一定長さ引き出して蓋体を閉め、フィルム全幅に渡り鋸刃の歯山が接触するようにフィルムを水平に引くことでフィルムの全幅を一気にカットするようにした。このカット方法は、汎用されているカット開始時にフィルム収納箱を少し傾けてフィルムの一方の端部よりカットする方法に比べ、フィルム収納箱への負荷がフィルムの種類や歯山の形状にもよるが５倍から１０倍大きいもので、フィルム収納箱への影響を加速的に評価するには都合がよい。この操作を繰り返してフィルム収納箱の破損状態を評価した。１００回以上繰り返してもフィルム収納箱に目立った破損が確認できないものを○（優れたカット性）、１０回以上１００回未満の繰り返しでフィルム収納箱に目立った破損が発生するものを△（実用上問題なし）、１０回未満の繰り返しでフィルム収納箱に目立った破損が発生するものを×（実用不可能）とした。
【００１８】
《切り取り部押し開けの容易性；容易性１》
鋸刃取り外し機能のついたフィルム化粧箱を５箱準備し、デジタルフォースゲージ（ＦＧＸ−５（商品名）；日本電産シンポ（株）製）の先端に直径１５ｍｍの円盤状冶具を取り付け、その冶具をサンプル台に固定したフィルム化粧箱の切り取り部にセットして押し開ける操作を実施した。その際の最大荷重を測定し平均値を計算した。２０Ｎ未満のものを○（優れた容易性）、２０Ｎ以上３５Ｎ以下のものを△（実用上問題なし）、３５Ｎを超えるのものを×（実用上問題あり）とした。
【００１９】
《鋸刃取り外しの容易性；容易性２》
各種鋸刃取り外し機能のついたフィルム収納箱を各５箱準備し、切り取り部をデジタルフォースゲージ（ＦＧＸ−５；日本電産シンポ（株）製）に取り付けたチャックで保持し、フィルム収納箱本体をサンプル台に固定し鋸刃を取り外す操作を実施した。その際の最大荷重を測定し平均値を計算した。１０Ｎ未満のものを○（優れた容易性）、１０Ｎ以上２０Ｎ未満のものを△（実用上問題なし）、２０Ｎ以上のものを×（実用上問題あり）とした。
【００２０】
《鋸刃の廃棄性》
鋸刃を取り外した際の廃棄性を鋸刃の跳ね度合いの状態で評価した。つまり、取り外した鋸刃をバネとして考え、螺旋状に回転している回数が多いほど弾性があり跳ね易く、廃棄し難いと評価した。１回転未満のものを○（優れた廃棄性）、１回転以上２回転未満のものを△（実用上問題なし）、２回転以上のものを×（廃棄性に問題あり）とした。
《総合評価基準》
前述の３項目の評価結果で、ひとつも×がないものを合格とし、×が１つでもあるものを不合格とした。
以下、実施例、比較例によって本発明を詳細に説明する。
【００２１】
【実施例、比較例】
実施例に供するフィルム収納箱の基本構造（鋸刃取り外し機構を除く）は図４で示した従来技術と同じ、つまり前板（１）、底板（２）、後板（３）、脇板（８）と補助脇板（９）、（９′）の各面で形成される上部が開口した収納室（１２）と、その収納室（１２）の後板の上端縁から開閉可能で収納室（１２）を覆う方向に連接した蓋板（４）、掩蓋片（５）、掩蓋片脇板（１０）、掩蓋片補助脇板（１１）の各面で形成された蓋体（１３）からなる高さＨが４４ｍｍで奥行きＬが４３ｍｍで幅Ｗが３１２ｍｍの直方体状で坪量４００ｇ／ｍ２の板紙製のフィルム収納箱である。このフィルム収納箱に収納されるフィルム巻筒体は幅３０ｃｍ×長さ２０ｍ×厚み１０ミクロンのポリ塩化ビニリデンフィルムを外径が３７ｍｍ、長さ３０７ｍｍの円筒状の紙管に巻いたものでフィルム巻筒体の直径は４１ｍｍである。このフィルム収納箱に取り付けられる鋸刃は、フィルム収納箱の幅方向の長さが３０４ｍｍ、フィルム収納箱高さ方向の長さが８ｍｍである。歯山の形状は、高さ０．５０ｍｍ、頂角６０度の二等辺三角形で歯山間には０．５ｍｍの平坦部を形成させたものである。これらの形状を基本とし統一して、鋸刃の材質と鋸刃取り外し機能を各種形成した収納箱を作成し評価に供した。
【００２２】
まず、鋸刃の材質、ロックウェル硬度、厚みを変えて評価した。切り取り部は、図３で示した掩蓋片（５）のフィルム収納箱幅方向の端部からの距離（Ｘ）が２ｍｍ、掩蓋片（５）の先端縁部からの距離（Ｙ）が５ｍｍの位置から開始し、鋸刃（Ｋ）の掩蓋片（５）の先端縁部からはみ出していない他方の先端近傍で終了する、繋ぎ部分（切れていない部分）／破線部分（貫通した切れ目）の値が１／３のミシン目状切り取り線で囲まれた親指が入る程度の大きさ（直径約２０ｍｍの半円状）のものに統一した。実験ＮＯ．１〜９を実施例１とし、実験ＮＯ．１０〜１４を比較例１とし詳細を表１に示す。
【００２３】
【表１】
【００２４】
前述の４項目の評価及び総合評価の結果を表２に示す。
【００２５】
【表２】
【００２６】
次に、切り取り部の、図３で示した掩蓋片（５）のフィルム収納箱幅方向の端部からの距離（Ｘ）、掩蓋片（５）の先端縁部からの距離（Ｙ）の寸法を変えたものを評価した。鋸刃はロックウェル硬度５５、厚み０．１７ｍｍのブリキに統一した。切り取り部は、繋ぎ部分（切れていない部分）／破線部分（貫通した切れ目）の値が１／３のミシン目状切り取り線で囲まれた親指が入る程度の大きさ（直径約２０ｍｍの半円状）のものに統一した。実験ＮＯ．１５〜２０を実施例２、実験ＮＯ．２１〜２４を実施例３とし詳細を表３に示す。
【００２７】
【表３】
【００２８】
前述の４項目の評価及び総合評価の結果を表４に示す。
【００２９】
【表４】
【００３０】
次に、繋ぎ部分（切れていない部分）／破線部分（貫通した切れ目）の値を変えたものを評価した。鋸刃はロックウェル硬度５５、厚み０．１７ｍｍのブリキに統一した。切り取り部は、図３で示した掩蓋片（５）のフィルム収納箱幅方向の端部からの距離（Ｘ）が２ｍｍ、掩蓋片（５）の先端縁部からの距離（Ｙ）が５ｍｍの位置から開始し、鋸刃（Ｋ）の掩蓋片（５）の先端縁部からはみ出していない他方の先端近傍で終了する親指が入る程度の大きさ（直径約２０ｍｍの半円状）のものに統一した。実験ＮＯ．２５〜２７を実施例４とし、実験ＮＯ．２８〜２９を実施例５とし詳細を表５に示す。
【００３１】
【表５】
【００３２】
前述の４項目の評価及び総合評価の結果を表６に示す。
【００３３】
【表６】
【００３４】
これらの結果から以下のことが判明した。
表２より、ロックウェル硬度が４６以上７３以下で厚みが０．１ｍｍ以上０．２ｍｍ以下の金属製鋸刃を用いたフィルム収納箱はカット性を維持しつつ容易に鋸刃をフィルム収納箱から分離でき廃棄できる。ロックウェル硬度が４６以上６０以下のものは更に好ましい。
尚、比較例１の実験Ｎｏ．１０と１１でカット性が×の評価になった理由はフィルム化粧箱の変形や破損ではなく、鋸刃材質のロックウェル硬度が低いためにカシメ爪の一部又は全部が取り付け部から外れてしまうためである。更に、実験Ｎｏ．１４で廃棄性が○の評価になった理由は鋸刃材質が紙製なので、そのまま廃棄できるためである。
【００３５】
表４より、切り取り部が、掩蓋片のフィルム収納箱幅方向の端部からの距離（Ｘ）が１ｍｍ以上５ｍｍ以下、掩蓋片の先端縁部からの距離（Ｙ）が２ｍｍ以上５ｍｍ以下の位置から開始したものは、カット性を維持しつつ容易に鋸刃をフィルム収納箱から分離でき廃棄できる。
表６より、切り取り線が、繋ぎ部分（切れていない部分）／破線部分（貫通した切れ目）の値が１／７以上１／２以下のミシン目状のものは、カット性を維持しつつ容易に鋸刃をフィルム収納箱から分離でき廃棄できる。
【００３６】
【発明の効果】
本発明のフィルム収納箱は、鋸刃の材質、硬度、厚み、更に切り取り部の形状、位置を規定したことによって、フィルム使用中はカット性を低下させることなく、フィルム使用後に容易に鋸刃を取り外すことが可能となった。
【図面の簡単な説明】
【図１】本発明のフィルム収納箱の蓋体が開いた状態を示す立体模式図である。
【図２】図１に示す本発明のフィルム収納箱の展開図である。
【図３】切り取り部の各部寸法Ｘ、Ｙを示す部分的に拡大した展開図である。
【図４】従来のフィルム収納箱を示す立体模式図である。
【図５】従来技術の一例で、鋸刃の近傍にミシン目による分離部分（１５）を設定し、その部分を指で押し開き指穴状摘み代とするフィルム収納箱の部分拡大図である。
【図６】従来技術の一例で、掩蓋片脇板と掩蓋片補助脇板の少なくとも一方から掩蓋片の一部にかけてミシン目によって切り取り可能となる部分（１６）を設けてミシン目分離状摘み代とするフィルム収納箱の部分拡大図である。
【符号の説明】
１ 前板
２ 底板
３ 後板
４ 蓋板
５ 掩蓋片
６ 開封片
７ 縁折り片
８ 脇板
９ 補助脇板
９′補助脇板
１０ 掩蓋片脇板
１１ 掩蓋片補助脇板
１２ 収納室
１３ 蓋体
１４ 切り取り部
１５ 舌状挟着片（指穴状摘み代）
１６ 切り取り可能部分（ミシン目分離状摘み代）
Ｆ フィルム
Ｋ 鋸刃
Ｒ 巻筒体
Ｔ カシメ爪
Ｘ 切り取り部のフィルム収納箱幅方向の端部からの距離
Ｙ 切り取り部の掩蓋片の先端縁部からの距離[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a film storage box for storing a food packaging film such as a wrap film or aluminum foil. In particular, the present invention relates to a film storage box having a storage box strength for maintaining film cutting performance during use, and enabling a saw blade to be easily removed when empty boxes are discarded after use.
[0002]
[Prior art]
As shown in the three-dimensional view of FIG. 4, the upper part consisting of the front plate (1), the bottom plate (2), the rear plate (3), the side plate (8), the auxiliary side plate (9), and (9 ') The opened storage room (12) was connected in a direction to cover the storage room composed of each surface of the cover plate (4), the cover piece (5), the cover side plate (10), and the cover side auxiliary side plate (11). A saw blade (K) is fixed to the tip edge of the cover piece (5) with the cutting edge protruding from the tip edge. A rectangular parallelepiped film storage box is well known. In this type of film storage box, the opening piece (6) glued to the front plate (1) is peeled off, the lid (13) is opened, the end of the film (F) is picked with a finger, and a required amount is pulled out. Then, the film is cut with a saw blade (K) fixed to the tip of the cover piece with the blade edge protruding and used. The film storage box is made of various materials such as paperboard and cardboard. Also, the material of the saw blade (K) is various such as metal, paper, and resin, and various shapes such as linear, V-shaped, and curved are known. As a method of attaching the saw blade to the film storage box, fixing with a caulking claw (T) in the case of metal and fixing with an adhesive or ultrasonic bonding in the case of paper or resin are known.
[0003]
This type of film storage box generally has a metal saw blade attached to a paperboard storage box. In recent years, non-metal saw blades have been gradually put into practical use in response to environmental issues. ing. Film storage boxes with metal saw blades have good cutting performance but need to be separated when discarded. Further, the film storage box to which the non-metal saw blade is attached does not need to be discarded separately, but has a problem in cutting performance.
As a device for making the metal saw blade detachable from the film storage box, a method has been proposed in which a cut line is formed in a part of the film storage box and the saw blade is removed by cutting off a part of the film storage box. In this method, a perforation is provided in the vicinity of the saw blade as shown in Japanese Utility Model Laid-Open No. 60-195735 shown in FIG. A method of removing the saw blade by pinching it, or a portion 16 which can be cut by a perforation in the film storage box as shown in Japanese Patent Application Laid-Open No. 6-345079 shown in FIG. There is a method in which the saw blade is removed along the perforation and the saw blade is removed. However, in the case of forming a cutout portion in the film storage box by a perforation or the like as described above, the strength of the film storage box is reduced if a large number of cut lines are used in order to easily remove the saw blade. In particular, since a cutting line is formed near the saw blade, the cutting performance cannot be reduced because the cutting force cannot withstand the force of cutting the film. Further, in these methods, the saw blade may be greatly curled in a spiral shape when removed, and may be difficult to discard.
[0004]
As a non-metallic saw blade with improved cutting performance, Japanese Unexamined Utility Model Publication No. 1-128524 discloses a fibrous reinforcing resin blade having a Rockwell hardness of 90 to 130, and Japanese Patent Application Laid-Open No. 5-162747 discloses a Rockwell hardness. Vulcanized fiber blades of 90 or more and 120 or less have been proposed. Although these non-metallic saw blades increase the Rockwell hardness and improve the film cutting performance, they do not match metal saw blades. Further, when the storage box is recycled as waste paper, there is a problem that these are harder to remove because they have higher hardness than ordinary papers.
[0005]
[Problems to be solved by the invention]
SUMMARY OF THE INVENTION An object of the present invention is to provide a film storage box that achieves both good film cutting performance and good discardability.
[0006]
[Means for Solving the Problems]
The present inventors have conducted intensive studies to achieve the above object, and as a result, have accomplished the present invention. That is, the present invention is as follows.
1) A storage room (12) with an open upper part consisting of the front plate (1), bottom plate (2), rear plate (3), side plate (8), auxiliary side plate (9), and (9 '). And an openable and closable lid (13) connected in a direction to cover a storage room composed of each surface of a lid plate (4), a cover piece (5), a cover piece side plate (10), and a cover piece auxiliary side plate (11). ), The saw blade (K) is fixed to the tip edge of the cover piece (5) with the cutting edge protruding from the tip edge, and a rectangular parallelepiped in which the film winding body (R) is stored. In the film storage box, a cutout (14) surrounded by a cutout line for removing a saw blade (K) is formed on a cover piece (5), and the saw blade (K) is formed of a Rockwell hardness. Characterized in that the film storage box is made of metal having a thickness of 46 to 73 and a thickness of 0.1 to 0.2 mm.
[0007]
2) The cutout portion (14) has a distance (X) from the end of the cover piece (5) in the width direction of the film storage box of 1 mm or more to 5 mm or less, and a distance (Y) from the leading edge of the cover piece (5). ) Starts at a position of 2 mm or more and 5 mm or less and ends near the other end of the saw blade (K) that does not protrude from the end edge of the cover piece (5), and is a convex arc in the direction of the cover plate (4). Alternatively, the film storage box according to 1), wherein the film storage box is surrounded by a cut line formed by a combination of straight lines.
3) The cut line has a perforated shape in which a value of a connecting portion (uncut portion) / a broken line portion (penetrating cut) is 1/7 or more and 1/2 or less. The described film storage box.
The present invention regulates the material, hardness, and thickness of the saw blade, and further provides a cut-out portion to easily maintain the function as a film storage box during use, particularly the cutability of the film during use, and to be easily used after use. The saw blade can be removed from the film storage box, which improves discardability.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in more detail with reference to the drawings, particularly focusing on its preferred embodiments. 1 and 2 show an embodiment of the present invention. FIG. 1 is a three-dimensional schematic view of a film storage box, and FIG. 2 is a developed view thereof. FIG. 3 is an enlarged view of the cutout portion (14), showing the start position of the cutout portion, the distance (X) from the end of the cover piece (5) in the width direction of the film storage box, and the leading edge of the cover piece (5). The distance (Y) from the section is shown. FIG. 4 is a schematic perspective view showing a conventional film storage box. FIG. 5 shows an example of the prior art in a film storage box in which the saw blade is fixed to the upper edge of the front plate. A separation portion (15) is set by a perforation near the saw blade, and the portion is pushed open with a finger. It is the elements on larger scale of the film storage box used as a finger hole-shaped picking margin. FIG. 6 shows a prior art film in which a portion (16) that can be cut out by perforation is provided from at least one of the cover side plate and the cover side auxiliary side plate to a part of the cover portion to provide a perforated separation-shaped allowance. It is the elements on larger scale of a storage box.
[0009]
As shown in FIGS. 1 and 4, the film storage box of the present invention has the same basic structure as a conventional film storage box. That is, the upper part formed by the front plate (1), the bottom plate (2), the rear plate (3), and the side plates (8), the auxiliary side plates (9), and (9 ') is open, and the winding is performed. A storage chamber (12) for storing the tubular body (R), and a lid plate (4) that can be opened and closed from the upper edge of a rear plate (3) of the storage chamber (12) and that is connected in a direction covering the storage chamber (12). And a cover piece (5) extending from the front edge of the cover plate (4) in a direction to cover the front plate (1), and each face of a cover piece side plate (10) and a cover piece auxiliary side plate (11) It is a rectangular parallelepiped film storage box composed of a lid (13) formed of. A saw blade (K) for cutting the film (F) is provided in the film storage box, and a required amount of film is pulled out from the winding tube (R) stored in the storage chamber (12) and cut. Used.
[0010]
The saw blade used in the present invention is made of a metal having a Rockwell hardness (HR30T) of 46 or more and 73 or less according to JIS Z 2245. Those having a Rockwell hardness of 46 or more and 73 or less do not have a large curl in a spiral shape when removed, are easily discarded, and have no problem in mounting the saw blade with a swaging claw. If it is less than 46, there is no problem in the ease of disposal, but there is also a problem in the piercing property of the swaging nail into the paperboard because the material is soft. On the other hand, in the case of over 73, the material is hard, so that there is no problem in the piercing property of the swaging nail into the paperboard. However, when the saw blade is removed, the saw blade may be largely curled spirally. Those having a Rockwell hardness (HR30T) of 46 or more and 60 or less are more preferable because they are easy to discard and the piercing properties of the swaging nail are harmonized.
[0011]
The thickness of the metal saw blade is 0.1 mm or more and 0.2 mm or less. In this range, the cutting performance and the ease of disposal are balanced.In the case of a blade cutter that punches with upper and lower molds, the molds after punching have sufficient mold wear and durability. The precision of cutting is good and the cutting performance is maintained. Those having a diameter of 0.15 mm or more and 0.18 mm or less are particularly preferable because the accuracy of the tooth form is particularly good.
The metal used for the metal blade is not particularly limited, but is preferably a tin material from the viewpoints of perforation by a caulking pin for fixing to a paperboard storage box with a caulking claw, and piercing properties of the caulking claw into the paperboard. The entire shape of the saw blade is not particularly limited as long as it is a conventionally known shape such as a linear shape, a V shape, and a curved shape, and the shape of the tooth ridge may be a conventionally known shape.
[0012]
The cutout (14) for removing the saw blade according to the present invention is such that the distance (X) from the end of the cover piece (5) in the width direction of the film storage box is 1 mm or more and 5 mm or less, and the tip edge of the cover piece (5). It is preferable to start from a position at a distance (Y) from 2 mm to 5 mm. FIG. 3 shows X and Y. When the X is less than 1 mm or the Y is less than 2 mm, the cut-off portion when removing the saw blade has low resistance and can be cut smoothly. However, when the film is repeatedly cut, the end of the saw blade in the width direction of the film storage box is repeated. , The bending and tearing of the perforations are likely to occur, which reduces the strength of the film storage box near the saw blade, and covers the width of the film storage box where the saw blade is attached during cutting. In some cases, the ends of the pieces become unstable, resulting in a decrease in cutability. In addition, when X exceeds 5 mm or Y exceeds 5 mm, the strength of the storage box does not change even if the film is repeatedly cut, but the resistance of the cutout portion when the saw blade is removed is large. It may be difficult to remove.
[0013]
The cut-out preferably starts from said position and ends near the other tip of the saw blade (K) that does not protrude from the tip edge of the cover piece (5). By doing so, the cutting portion does not come off from the saw blade during the removal of the saw blade, the cutting direction of the saw blade is determined along the other tip, and stable cutting is realized, and the removal of the saw blade is completed reliably. . If the end is largely shifted in the direction of the cover plate (4) from the other end, the cutting is not stable and the storage box is easily broken. In addition, if the cutting ends too close to the tip edge of the cover piece instead of the other tip, the cutout may be torn off and separated from the saw blade before the cutting of the saw blade ends.
[0014]
It is preferable that the shape of the cutout portion is surrounded by a cutout line composed of a combination of circular arcs or straight lines protruding in the direction of the cover plate (4). If that part is pushed open with a finger and a margin is used, the shape can be U-shaped, trapezoidal, triangular, etc., as long as a sufficient cutting force can be transmitted to the fingertip, only one side of the cover piece Alternatively, it may be installed on both sides.
It is further preferable that the cut line has a value of 1/7 or more and 1/2 or less of a connecting portion (uncut portion) / a broken line portion (penetrating cut). When the ratio of the connecting portion is less than 1/7, the cutting performance is not affected, but the resistance when the cutout portion is pushed open by the finger along the perforation tends to increase. On the other hand, when the ratio exceeds 抵抗, the resistance of pushing and opening the cutout portion with a finger along the perforation is small, but the strength of the storage box tends to decrease.
[0015]
The material used for the film storage box of the present invention is not particularly limited, such as paperboard having a basis weight of 100 to 600 g / m 2 , various cardboards such as G flute and F flute, and plastic molded products. When the saw blade is removed by cutting the paperboard, a paperboard having a basis weight of 300 g / m 2 or more from the viewpoint of maintaining the cutability and a paperboard of 600 g / m 2 or less from the viewpoint of facilitating the cutting of the paperboard when removing the saw blade are preferable. When the weight is less than 300 g / m 2 , little force is required when tearing the paperboard, but the strength of the storage box tends to be insufficient, and the function as a film storage box, particularly the cutability, tends to decrease. If it exceeds 600 g / m 2 , the strength of the storage box is sufficient and the function as a film storage box, in particular, the cutability does not decrease, but force may be required when tearing the paperboard to cut the saw blade. .
[0016]
In the film storage box of the present invention, the length in the height direction and the depth direction is not particularly limited, and is preferably 40 to 60 mm, which is conventionally used well, and the winding tube is wound with a film of 15 to 45 cm in the width direction. Those that can store the body are preferred.
The film stored in the film storage box of the present invention is not particularly limited, such as various types of resin wrap film, aluminum foil, cooking paper, etc., but the vinylidene chloride-based film has a very small tear propagation strength and is extremely useful in combination with a metal saw blade. Popular and preferred.
Next, the present invention will be described in detail based on examples. The evaluation method and evaluation criteria used in the present invention are described below.
[0017]
《Cutability》
Store the film roll in the film storage box, pull out the film for a certain length, close the lid, and pull the film horizontally so that the teeth of the saw blade are in contact with the entire width of the film. I cut it. In this cutting method, the load on the film storage box depends on the type of the film and the shape of the tooth ridge, compared to the general method of inclining the film storage box a little at the start of cutting and cutting from one end of the film. Is 5 to 10 times larger, and it is convenient to accelerately evaluate the influence on the film storage box. This operation was repeated to evaluate the damage state of the film storage box. A case where no noticeable damage was found in the film storage box even after repeating 100 times or more was evaluated as ○ (excellent cutability), and a case where noticeable damage occurred in the film storage box after 10 times or more and less than 100 times was evaluated as △ (practical). (No problem in the above) The film storage box in which remarkable damage occurs after less than 10 repetitions was evaluated as x (impractical).
[0018]
<< Easy to push open cutout; Easy 1 >>
Five film decorative boxes with a saw blade removal function are prepared, and a disk-shaped jig having a diameter of 15 mm is attached to the tip of a digital force gauge (FGX-5 (trade name); manufactured by Nidec Shinpo Co., Ltd.). An operation of setting the jig on the cutout portion of the film decorative box fixed to the sample table and pushing it open was performed. The maximum load at that time was measured and the average value was calculated. Those with less than 20 N were rated as ○ (excellent easiness), those with 20 N or more and 35 N or less were rated as 実 用 (no practical problem), and those with more than 35 N were rated as x (practical problem).
[0019]
<< Easy removal of saw blade; Easy 2 >>
Five film storage boxes with various saw blade removal functions were prepared, and the cutout was held by a chuck attached to a digital force gauge (FGX-5; manufactured by Nidec Shinpo Co., Ltd.). Was fixed to the sample table and the saw blade was removed. The maximum load at that time was measured and the average value was calculated. Those with less than 10N were rated as ○ (excellent easiness), those with 10N or more and less than 20N were rated as △ (no practical problem), and those with 20N or more were rated as x (with practical problem).
[0020]
《Saw blade disposability》
The disposability when the saw blade was removed was evaluated in terms of the degree of rebound of the saw blade. In other words, the detached saw blade was considered as a spring, and it was evaluated that the greater the number of times of spiral rotation, the more elastic, the easier it was to jump, and the more difficult it was to dispose. A sample with less than 1 rotation was rated as ○ (excellent disposal), a sample with 1 rotation or more and less than 2 rotations as Δ (no practical problem), and a sample with 2 rotations or more as x (poor in disposal).
《Comprehensive evaluation criteria》
In the evaluation results of the above-mentioned three items, those having no x were regarded as pass, and those having at least one x were rejected.
Hereinafter, the present invention will be described in detail with reference to Examples and Comparative Examples.
[0021]
[Examples and Comparative Examples]
The basic structure (excluding the saw blade removing mechanism) of the film storage box used in the embodiment is the same as that of the prior art shown in FIG. 4, that is, the front plate (1), the bottom plate (2), the rear plate (3), and the side plate ( 8) and a storage room (12) formed by each surface of the auxiliary side plates (9) and (9 ') and having an open top, and a storage room that can be opened and closed from the upper edge of the rear plate of the storage room (12). From the lid (13) formed on each surface of the lid (4), the cover piece (5), the cover piece side plate (10), and the cover piece auxiliary side plate (11) connected in the direction covering the (12). It is a rectangular parallelepiped film storage box having a height H of 44 mm, a depth L of 43 mm and a width W of 312 mm and a basis weight of 400 g / m 2 . The film winding cylinder housed in this film storage box is formed by winding a polyvinylidene chloride film having a width of 30 cm, a length of 20 m and a thickness of 10 μm on a cylindrical paper tube having an outer diameter of 37 mm and a length of 307 mm. The diameter of the cylinder is 41 mm. The saw blade attached to the film storage box has a length in the width direction of the film storage box of 304 mm and a length in the height direction of the film storage box of 8 mm. The shape of the tooth ridge is an isosceles triangle having a height of 0.50 mm and a vertex angle of 60 degrees, and a flat portion of 0.5 mm is formed between the tooth ridges. Based on these shapes, a storage box having various shapes of saw blade materials and saw blade removal functions was prepared and provided for evaluation.
[0022]
First, the evaluation was performed while changing the material, Rockwell hardness and thickness of the saw blade. The cut-off portion has a distance (X) of 2 mm from the end in the width direction of the film storage box of the cover piece (5) shown in FIG. 3 and a distance (Y) of 5 mm from the leading edge of the cover piece (5). The value of the joint portion (uncut portion) / dashed line portion (penetrating cut) starting from the position and ending near the other tip not protruding from the tip edge of the cover piece (5) of the saw blade (K) Are of a size (semicircular with a diameter of about 20 mm) large enough to allow a thumb surrounded by a 1/3 perforated cut line. Experiment NO. Examples 1 to 9 are referred to as Example 1, and the experiment Nos. Tables 1 to 14 show details of Comparative Examples 1 to 10.
[0023]
[Table 1]
[0024]
Table 2 shows the results of the above-mentioned four items of evaluation and comprehensive evaluation.
[0025]
[Table 2]
[0026]
Next, the dimensions of the cut-out portion are the distance (X) from the end of the cover piece (5) shown in FIG. 3 in the width direction of the film storage box and the distance (Y) from the leading edge of the cover piece (5). Were evaluated. The saw blades were standardized to tinplate having a Rockwell hardness of 55 and a thickness of 0.17 mm. The cut-out portion is large enough to fit a thumb surrounded by a perforated cut line having a connection portion (uncut portion) / dashed line portion (penetrated cut) (a semicircle having a diameter of about 20 mm). Letter). Experiment NO. Nos. 15 to 20 in Example 2, Experiment NO. Tables 3 to 4 show the details of 21 to 24 as Example 3.
[0027]
[Table 3]
[0028]
Table 4 shows the results of the evaluation of the above four items and the comprehensive evaluation.
[0029]
[Table 4]
[0030]
Next, the evaluation was made with the value of the connected portion (uncut portion) / broken line portion (penetrating cut) changed. The saw blades were standardized to tinplate having a Rockwell hardness of 55 and a thickness of 0.17 mm. The cut-off portion has a distance (X) of 2 mm from the end in the width direction of the film storage box of the cover piece (5) shown in FIG. 3 and a distance (Y) of 5 mm from the leading edge of the cover piece (5). Starting from the position, it ends in the vicinity of the other tip that does not protrude from the tip edge of the cover piece (5) of the saw blade (K). Unified. Experiment NO. Experiment Nos. 25 to 27 were designated as Example 4. 28 to 29 are Example 5, and details are shown in Table 5.
[0031]
[Table 5]
[0032]
Table 6 shows the results of the above-mentioned four items of evaluation and comprehensive evaluation.
[0033]
[Table 6]
[0034]
From these results, the following was found.
From Table 2, the film storage box using a metal saw blade having a Rockwell hardness of 46 or more and 73 or less and a thickness of 0.1 mm or more and 0.2 mm or less can easily remove the saw blade from the film storage box while maintaining cutability. Can be separated and discarded. Those having a Rockwell hardness of 46 or more and 60 or less are more preferable.
In addition, the experiment No. of Comparative Example 1 was performed. The reason why the cutability was evaluated as “x” in 10 and 11 is not the deformation or breakage of the film decorative box, but a part or all of the swaging nail comes off from the mounting part because the Rockwell hardness of the saw blade material is low. That's why. Further, in Experiment No. The reason why the disposability was evaluated as で in 14 is that the saw blade material was made of paper, so that it can be discarded as it is.
[0035]
As shown in Table 4, the cutout position is such that the distance (X) from the end of the cover piece in the width direction of the film storage box is 1 mm or more and 5 mm or less, and the distance (Y) from the tip edge of the cover piece is 2 mm or more and 5 mm or less. Starting from the above, the saw blade can be easily separated from the film storage box while maintaining the cutting property, and can be discarded.
From Table 6, it can be seen that the cut line has a perforated shape in which the value of the connecting portion (uncut portion) / broken line portion (penetrating cut) is 1/7 or more and 1/2 or less, while maintaining the cut property. The saw blade can be separated from the film storage box and discarded.
[0036]
【The invention's effect】
The film storage box of the present invention is characterized in that the material, hardness and thickness of the saw blade, and the shape and position of the cutout portion are specified, so that the saw blade can be easily used after the use of the film without lowering the cutability during use of the film. It became possible to remove it.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view showing a state where a lid of a film storage box of the present invention is opened.
FIG. 2 is a development view of the film storage box of the present invention shown in FIG.
FIG. 3 is a partially enlarged development view showing respective dimensions X and Y of a cutout portion.
FIG. 4 is a schematic perspective view showing a conventional film storage box.
FIG. 5 is an enlarged view of a part of a film storage box in which a separation part (15) by perforation is set in the vicinity of a saw blade and the part is pushed open with a finger to form a finger hole-shaped knob margin, as an example of the prior art. .
FIG. 6 shows an example of the prior art, in which a part (16) that can be cut by perforation is provided from at least one of the cover side plate and the cover side auxiliary side plate to a part of the cover part to provide a perforation separation-like notch. It is the elements on larger scale of the film storage box.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 front plate 2 bottom plate 3 rear plate 4 cover plate 5 cover piece 6 opening piece 7 edge folded piece 8 side plate 9 auxiliary side plate 9 ′ auxiliary side plate 10 cover side plate 11 cover side auxiliary side plate 12 storage room 13 lid 14 Cut-out part 15 Tongue-shaped sandwiching piece (finger hole-shaped picking allowance)
16 Cutable parts (separation perforated picking allowance)
F Film K Saw blade R Winding cylinder T Crimper Claw X Distance of cutout from end of film storage box width direction Y Distance of cutout from tip edge of cover piece