JP4272809B2

JP4272809B2 - Light-shielding photosensitive material roll and light-shielding reader

Info

Publication number: JP4272809B2
Application number: JP2000394652A
Authority: JP
Inventors: 将文福川; 明久井上; 陽宏門田; 光一中戸川
Original assignee: Fujifilm Corp
Current assignee: Fujifilm Corp
Priority date: 1999-12-27
Filing date: 2000-12-26
Publication date: 2009-06-03
Anticipated expiration: 2020-12-26
Also published as: JP2001249431A

Description

【０００１】
【発明の属する技術分野】
本発明は、長尺状感光材料シートを巻芯の周囲に巻き付けてなる感光材料ロールの包装体、及び感光材料ロールを包装するのに好適に用いることができる遮光リーダに関する。
【０００２】
【従来の技術】
長尺な印画紙などの感光材料シートを巻芯の周囲に巻き付けてなる感光材料ロールの巻芯の両端部に円盤状遮光部材（遮光フランジともいう）を取り付け、そして、その外周に遮光リーダを巻き付けた感光材料ロールの包装体（以下、遮光性感光材料ロールという）であって、感光材料シートを露光させることなく明室で機械に装填することができる遮光性感光材料ロールとしては、以下に示す構成のものが知られている。
【０００３】
特許第２８９９５９４号では、感光材料ロール、遮光リーダ、そしてシーリングディスク、その周縁部に切り込み部分（フラップ形状セグメント）が設けられている可撓部及びハブ形状部からなる端部キャップから構成され、感光材料ロールの周囲に遮光リーダを巻き付け、端部キャップのハブ形状部を感光材料ロールの中空コアに挿入し、フラップ形状セグメントを折り曲げて、遮光リーダと端部キャップとを固定した遮光性感光材料ロールが提案されている。しかし、この遮光性感光材料ロールは、端部キャップの可撓部の形状が複雑であり、かつ製造においても端部キャップの可撓部を折り曲げるための装置が必要となる。
【０００４】
特開平１１−１０５９４１号公報では、感光材料ロールの周囲に遮光リーダを巻き付けた状態で、感光材料ロールの両端面に円盤状遮光部材を取り付け、円盤状遮光部材の周辺部を折り曲げて、遮光リーダと円盤状遮光部材とを接着した遮光性感光材料ロールが提案されている。しかし、この遮光性感光材料ロールも、上記特許第２８９９５９４号に提案されている遮光性感光材料ロールと同様に、製造において、円盤状遮光部材の可撓部を折り曲げるための装置が必要となる。
【０００５】
また、特開平８−６２７８３号公報では、感光材料より幅の広い遮光リーダを引っ張りながら感光材料ロールに巻き付けることにより、遮光リーダを部分的に伸ばして、感光材料ロールの遮光フランジの外側面まで覆うように巻き付けた遮光性感光材料ロールが提案されている。この遮光性感光材料ロールは、円盤状遮光部材などを折り曲げるための装置を必要としないが、遮光リーダを感光材料ロールに巻き付ける際に、遮光リーダを局部的に引き伸ばすために遮光リーダが切れたり、感光材料ロールの幅方向に均一な張力を付与することが難しいなどの問題がある。
【０００６】
このような問題に対し、本特許出願人は、長さ方向に熱収縮する長尺状熱収縮性遮光リーダを感光材料ロールに円盤状遮光部材を取り付けた状態で巻き付け、次いで、遮光リーダを加熱して収縮させることにより、遮光リーダの両端部と円盤状遮光部材の外側表面とを密着させた遮光性感光材料ロールを容易に製造することができることの発見に基づく発明について、すでに特許出願している（特願平１１−５０９４６号）。
【０００７】
【発明が解決しようとする課題】
遮光性感光材料ロールは、保存状態では感光材料シートを露光させないように遮光リーダが感光材料ロールから外れにくく、また、機械に装填した後には感光材料シートを容易に取り出すことができるものであることが好ましい。しかしながら、本発明者の研究によれば、上記の長尺状熱収縮性遮光リーダを用いた遮光性感光材料ロールでは、遮光リーダを熱収縮させる際に、遮光リーダが部分的に溶融して、円盤状遮光部材の外側表面に部分的に融着し、遮光性感光材料ロールから感光材料シートを取り出しにくくなることがあることが判明した。また、部分的に融着していない状態でも、遮光リーダ両端部がシワ状となり、その部分が抵抗となって、遮光性感光材料を装填した機械のポート口にひっかかり感光材料シートが取り出しにくくなることも判明した。
【０００８】
従って、本発明の目的は、保存状態では遮光リーダが感光材料ロールから外れにくく、また、機械に装填した後には容易に感光材料シートを取り出すことができる遮光性感光材料ロールを提供することにある。また、本発明は、そのような遮光性感光材料ロールを製造するのに有利に用いることができる感光材料ロール包装用遮光リーダを提供することもその目的とする。
【０００９】
【課題を解決するための手段】
本発明は、長尺状感光材料シートが巻芯の周囲に巻き付けられてなる感光材料ロール、該感光材料ロールの巻芯の両端部のそれぞれに取り付けられた、感光材料ロールの半径と略同一の半径を有する円盤状遮光部材、そして該感光材料ロールの長尺状感光材料シートの先端部に接合されている、長さが該円盤状遮光部材の円周よりも長く、幅が該長尺状感光材料シートの幅と略同一の長尺遮光シートの両側部に、それぞれ幅方向に張り出すように、両側端部に沿って、長さが該円盤状遮光部材の円周よりも長く、長さ方向に沿って引裂き可能で、１００℃において長さ方向の熱収縮率が５〜３０％の範囲にあり、幅方向の熱収縮率が長さ方向の熱収縮率よりも１％以上小さい値を示す熱収縮性遮光フィルム製細片が付設されてなる遮光リーダを含み、かつ該熱収縮性遮光フィルム製細片の張り出し部が円盤状遮光部材の外周縁部を超えて外側表面に主として長さ方向に熱収縮した状態で融着していることを特徴とする遮光性感光材料ロールにある。
【００１０】
本発明の遮光性感光材料ロールの好ましい態様を下記に示す。
【００１１】
（１）巻芯が中空であり、かつ円盤状遮光部材がその中心部分の表面にリング状突起を有していて、そのリング状突起が中空巻芯の内壁に接触するように、巻芯内部にはめ込まれている。
【００１２】
（２）遮光リーダの先端部に接着テープが取り付けられていて、遮光リーダの先端部と該遮光リーダの一周回前の外側表面とが該粘着テープにより封止されている。
【００１３】
（３）引裂き可能な熱収縮性遮光フィルム製細片が長さ方向に沿って０．１〜０．５Ｎのエルメンドルフ引裂強さを示すものである。
【００１４】
（４）引裂き可能な熱収縮性遮光フィルム製細片が、遮光リーダの巻き出し時に、遮光シートの側端部に平行な方向もしくは側端部から遠ざかる方向に引裂かれる特性をもつものである。
【００１６】
（５）引裂き可能な熱収縮性遮光フィルム製細片が、熱収縮性フィルムとその両側表面のそれぞれに積層された実質的に熱収縮性を示さない熱可塑性遮光性フィルムとからなるものである。
【００１７】
（６）長尺遮光シートが実質的に熱収縮性を示さないシート材料からなるものである。
【００１８】
本発明はまた、長尺遮光シートの両側部に、それぞれ幅方向に張り出すように、両側端部に沿って、長さ方向に沿って引裂き可能で、１００℃において長さ方向の熱収縮率が５〜３０％の範囲にあり、幅方向の熱収縮率が長さ方向の熱収縮率よりも１％以上小さい値を示す熱収縮性遮光フィルム製細片が付設されてなる遮光リーダにもある。
【００１９】
【発明の実施の形態】
図１に、本発明の遮光性感光材料ロールの一例の分解斜視図を示す。本発明の遮光性感光材料ロールは、長尺状感光材料シート３を巻芯２の周囲に巻き付けてなる感光材料ロール１、感光材料ロールの巻芯２の両端部に取り付けられ、感光材料ロールの両端面に照射する光を遮光する一対の円盤状遮光部材４、感光材料ロール１の長尺状感光材料シート３の先端に接合され、感光材料ロールの外周に巻き付けられて、感光材料ロールの外周面に照射する光を遮光する遮光リーダ５、及び遮光リーダと感光材料ロールとを接合する粘着テープ８ｂ、遮光リーダの先端部に取り付けられ、遮光リーダを封止する接着テープ８ａから構成される。
【００２０】
本発明の遮光性感光材料ロールは、遮光リーダ５が、長尺状遮光シート６の両側部に、それぞれ幅方向に突き出すように両側端部に沿って、長さ方向に引裂き可能な熱収縮性遮光フィルム製細片７が付設されてなるものであることに主な特徴がある。
【００２１】
遮光シート６は、長さが円盤状遮光部材の円周よりも長く、好ましくは円盤状遮光部材の円周の二倍よりも短く、幅が長尺状感光材料シートの幅と略同一であるシートである。熱収縮性遮光フィルム製細片７は、長さが円盤状遮光部材の円周よりも長く、遮光シートよりも短いフィルムである。なお、熱収縮性遮光フィルム製細片７は、遮光性シート６の感光材料ロールと接しない側の表面に付設されていることが好ましい。
【００２２】
遮光シート６は、熱収縮性をほとんどあるいは全く示さないものであることが好ましく、公知の遮光性感光材料ロール用遮光リーダを使用することができる。具体的な遮光シート６の例としては、カーボンブラックなどの顔料を混入させた低密度ポリエチレンシートなどの遮光性プラスチックシートなどが挙げられる。
【００２３】
熱収縮性遮光フィルム製細片７の熱収縮率は、フィルムの長さ方向の熱収縮率が幅方向より相対的に大きい。１００℃における熱収縮性遮光フィルム製細片の長さ方向の熱収縮率は、５％以上、好ましくは１０％以上であり、幅方向の収縮率よりも絶対的な差として１％以上大きい。なお、本発明における熱収縮性遮光フィルム製細片の熱収縮率は、ＪＩＳＺ１７０９−１９７６（収縮包装用フィルム）に規定されている方法に準じて測定した値である。
【００２４】
熱収縮性遮光フィルム製細片７は、長さ方向におけるエンメルドルフ引裂荷重が、０．１〜０．５Ｎの範囲内にあることが好ましい。長さ方向におけるエンメルドルフ引裂荷重が、０．５より大きくなると熱収縮性遮光フィルム製細片が引裂きにくくなり、また、エンメルドルフ引裂荷重が、０．１Ｎより小さくなると、遮光性感光材料ロールの輸送時に、熱収縮性遮光フィルム製細片が引裂けてしまうことがある。なお、本発明における熱収縮性遮光フィルム製細片のエンメルドルフ引裂荷重は、ＪＩＳＫ７１２８−２：１９９８（プラスチック−フィルム及びシートの引裂き強さ試験方法−第２部）に規定されている方法に準じて測定した値である。
【００２５】
熱収縮性遮光フィルム製細片の例としては、長さ方向に大きな熱収縮性を有し、かつ長さ方向に引裂き可能な透明あるいは半透明の熱収縮性フィルム（シュリンクフィルム）に、熱収縮性をほとんどあるいは全く示さない遮光性フィルムを貼り合わせた積層フィルムを挙げることができるが、これに限定されるものではない。この積層型の熱収縮性遮光フィルム製細片に使用できるシュリンクフィルムとしては、例えば、ファンシーラップ（商品名、グンゼ（株）製）のグレードがＴＨＳ、ＴＮＳ、ＴＡＳ、ＴＢＳ、ＴＲＳであるものを挙げることができる。また、積層型の熱収縮性遮光フィルム製細片に使用できる遮光性フィルムとしては、例えば、カーボンブラックなどの顔料を混入させた低密度ポリエチレンフィルムなどのフィルムを挙げることができる。
【００２６】
積層型の熱収縮性遮光フィルム製細片の層構成としては、熱収縮性フィルムの両側表面のそれぞれに遮光性フィルムを積層した構成、熱収縮性フィルムの一方の表面に遮光性フィルムを積層した構成、遮光性フィルムの両側表面のそれぞれに熱収縮性フィルムを積層した構成を挙げることができる。これらの層構成の中でも、熱収縮性フィルムの両側表面のそれぞれに遮光性フィルムを積層した構成が好ましい。
【００２７】
熱収縮性遮光フィルム製細片の厚みは１００μｍ以下、特に６０〜９０μｍの範囲内にあることが好ましい。積層型の熱収縮性遮光フィルム製細片の場合、熱収縮性フィルムの厚みは２０〜４０μｍの範囲内にあることが好ましい。遮光性フィルムの厚みは２０〜４０μｍの範囲内にあることが好ましく、熱収縮性フィルムの厚みよりも１μｍ以上厚いことがより好ましい。
【００２８】
積層型の熱収縮性遮光フィルム製細片は、熱収縮性フィルムと遮光性フィルムとの貼り合わせ強度が大きいほど切り裂き性が良好になる。熱収縮性フィルムと遮光性フィルムとの貼り合わせ強度は、１５ｍｍ幅で１．５Ｎ以上であることが好ましい。なお、この貼り合わせ強度は、ＪＩＳＺ０２３７に規定されている方法に準じて測定した値である。
【００２９】
積層型の熱収縮性遮光フィルム製細片の製造方法（熱収縮性フィルムと遮光性フィルムとを貼り合わせる方法）に、特別な制限はなく、押し出しラミネート法、ドライラミネート法（溶剤型接着剤、非溶剤型接着剤のいずれの接着剤も使用可能）を採用することができる。
【００３０】
本発明の遮光性感光材料ロールにおいて巻芯２は、中空状の紙管あるいはプラスチック管を用いることができる。また、円盤状遮光部材４は、遮光性を有し、遮光リーダの熱収縮性遮光フィルム製細片をその表面に融着させる際に変形し難いものであれば、その材質などには特には制限はない。円盤状遮光部材４には、通常、中心部分の表面にリング状突起が設けられているフランジ形状のものが用いられる。円盤状遮光部材４は、リング状突起とフランジ部分とが一体となっていなくともよい。図１に示すように、リング４ｂにキャップ４ａをはみ込み、キャップ４ａのフランジ部分内側とリング４ｂの外側表面とを接着固定することにより形成してもよい。巻芯２と円盤状遮光部材４との取り付けは、円盤状遮光部材４のキャップ４ａを中空巻芯の内壁に接触するように、巻芯内部にはめ込むことにより行うことが好ましく、リング状突起部と巻芯の内壁とは、接着剤により接着されていることがさらに好ましい。
【００３１】
従来より、遮光性感光材料ロールの遮光リーダの表面には、長尺感光材料シートの感光材料（写真乳剤）の品種、製品番号（ロットナンバー）などを示す識別記号が外観から一目でわかるように付されている。本発明の遮光性感光材料ロールにおいても従来と同様に、遮光リーダの表面には、長尺感光材料シートの識別記号が付されていることが好ましい。さらに、本発明の遮光性感光材料ロールでは、遮光性感光材料ロールの使用後（すわなち、長尺感光材料シートを巻き出した後）においても、長尺感光材料シートの感光材料の品種、製品番号がわかるように、円盤状遮光部材あるいは巻芯にも識別記号を付しておくことが好ましい。円盤状遮光部材あるいは巻芯に識別記号を付する方法には、特別な制限はない。具体的には、レーベルに識別記号を印字して貼り付ける方法、インクジェットプリンタ、感圧・感熱プリンタ、レーザマーカなどの印刷機で直接、識別記号を印字する方法を挙げることができる。
【００３２】
本発明の遮光性感光材料ロールにおいて遮光リーダと感光材料ロールとを接合する粘着テープ８ｂ、遮光リーダの先端部に取り付けられ、遮光リーダを封止する接着テープ８ａには特に制限はなく、一般に市販されている粘着テープを使用することができる。
【００３３】
図２に、本発明の遮光性感光材料ロールの一例の製造工程図を示す。本発明の遮光性感光材料ロールは例えば下記の工程により製造することができる。
【００３４】
（１）感光材料ロール１の巻芯２の両端部のそれぞれに円盤状遮光部材４を取り付け、長尺状感光材料シート３の先端に、遮光リーダ５の先端部を取り付ける工程（第一工程）。
（２）遮光リーダ５を、感光材料ロール１の周囲に巻き付けながら、遮光リーダの熱収縮性遮光フィルム製細片７の表面に熱風を吹き付けて、熱収縮性遮光フィルム製細片７を収縮させて、円盤状遮光部材４の外側表面に熱収縮性遮光フィルム製細片を接触（密着）させる工程（第二工程）。
（３）遮光リーダの巻き終わりの先端部と遮光リーダの一周回前の外側表面とを接着テープ８ａにより封止する工程（第三工程）。
（４）上記第二工程により、円盤状遮光部材の外側表面に接触（密着）している熱収縮性遮光フィルム製細片７の表面にヒータ９を押し当てて、円盤状遮光部材４の外側表面に熱収縮性遮光フィルム製細片を融着させる工程（第四工程）。
【００３５】
図３に、上記の工程により製造された本発明の遮光性感光材料ロールの部分断面図を示す。本発明の遮光性感光材料ロールは、円盤状遮光部材４の内側表面が長尺状感光材料シート３の両側端面に接触して、長尺状感光材料シート３の両端を遮光し、遮光リーダ５の遮光シート６が感光材料シートの周りに巻き付けられ、長尺状感光材料シート３の外周面を、熱収縮性遮光フィルム製細片７が遮光シート６と円盤状遮光部材４との隙間を遮光する。そして、遮光リーダ５の熱収縮性遮光フィルム製細片７が、円盤状遮光部材４の外側表面に融着しているので、遮光リーダが感光材料ロールから外れにくくなる。
【００３６】
図４の（ａ）〜（ｃ）に、本発明の遮光性感光材料ロールから感光材料シートを巻き出す操作を表した概略図を示す。以下、図を参照しながら本発明の遮光性感光材料ロールから感光材料シートを取り出す操作を説明する。遮光性感光材料ロールの遮光リーダ５を矢印方向に引っ張ることにより、遮光リーダの熱収縮性遮光フィルム製細片７の遮光シート６に融着している部分と円盤状遮光部材４に密着している部分との間に亀裂が生じる（図４（ａ）参照）。なお、この亀裂を生じ易くするために、熱収縮性遮光フィルム製細片の先端部側に予め切り込みを設けておくことが好ましい。さらに遮光リーダを引っ張ると、遮光リーダの亀裂が伸びて、遮光リーダが遮光性感光材料ロールから引裂かれる（図４（ｂ）参照）。そして、遮光リーダの熱収縮性遮光フィルム細片７が完全に引裂れた状態で、遮光リーダを引っ張ると長尺感光材料シート３を取り出すことができる（図４（ｃ）参照）。
【００３７】
遮光性感光材料ロールから熱収縮性遮光フィルム製細片の引裂きにより、遮光リーダの巻き出しを行う場合、熱収縮性遮光フィルム製細片を、遮光シートの側端部に平行な方向もしくは側端部から遠ざかる方向に引裂くことが好ましい。このように熱収縮性遮光フィルム製細片を引裂くことによって、長尺感光材料シートの搬送（一旦巻き出した長尺感光性材料シートを巻き出す場合と一旦巻き出した長尺感光性材料シートを再度巻芯に巻き戻す場合とがある）が、円盤状遮光部材側に残った熱収縮性遮光フィルム製細片に妨害されにくくなる。
【００３８】
熱収縮性遮光フィルム製細片が引裂かれる方向は、熱収縮性遮光フィルム製細片の配向性の影響を受ける。従って、熱収縮性遮光フィルム製細片を遮光性シートに付設する際には、熱収縮性遮光フィルム製細片の配向が遮光性シートの側端部に沿って平行な方向となるように、あるいは、該配向が遮光リーダとした時に長尺感光材料シートに接合する側に向かって遮光性シートの側端部から遠ざかる方向となるようすることが好ましい。
なお、熱収縮性遮光フィルム製細片が積層型である場合、遮光フィルムに実質的に配向のないフィルムを用い、熱収縮性フィルム（シュリンクフィルム）の配向により熱収縮性遮光フィルム製細片の配向を決定することが好ましい。
【００３９】
【実施例】
［実施例１］
（遮光リーダの製造）
厚みが３０μｍのシュリンクフィルム（ＴＮＳ、グンゼ（株）製）の両面に、遮光性フィルム（カーボンブラックを５重量％混入した厚みが３０μｍの低密度ポリエチレンシート）を貼り合わせて熱収縮性遮光フィルム製細片を製造した。得られた熱収縮性遮光フィルム製細片の熱収縮率は、１００℃において、長さ方向で１３．３％、幅方向で１１．９％であり、長さ方向のエルメンドルフ引裂荷重は０．４３Ｎであった。この熱収縮性遮光フィルム製細片を、厚みが１００μｍのＰＥＴシートの両側表面にカーボンブラックを５重量％混入した厚みが４０μｍの低密度ポリエチレンシートを貼り合わせてなる遮光シートの両側部に、それぞれ幅方向に突き出すように両側端部に沿って貼り合わせて遮光リーダを製造した。
【００４０】
（遮光性感光材料ロールの製造）
上記の遮光リーダを、感光材料ロールの先端に粘着テープで接合し、円盤状遮光部材を感光材料ロールの両端部に取り付けた。次いで、ロール状感光材料の遮光リーダを、感光材料ロールの周囲に巻き付けながら、遮光リーダの熱収縮性遮光フィルム製細片の表面に２７０℃の熱風を吹き付けて、遮光リーダの熱収縮性遮光フィルム製細片を円盤状遮光部材の外周縁部を超えて外側表面に熱収縮した状態で接触させた。そして、遮光リーダの巻き終わりの先端部と該遮光リーダの一周回前の外側表面とを接着テープにより封止した後、円盤状遮光部材の外側表面に密着している熱収縮性遮光フィルム製細片の表面に１３０℃に加熱したヒータを押し当てて、円盤状遮光部材の外側表面と熱収縮性遮光フィルム製細片とを融着させた。
【００４１】
［評価］
（１）ロール状感光材料包装体の遮光性試験
遮光性感光材料ロールを１０００ルクスの下で１時間静置した後、ロール状感光材料包装体から感光材料シートを取り出して、感光材料の露光状態を調査した。その結果、感光材料シートは露光していなかった。
（２）遮光性感光材料ロールの感光材料シートの取り出し試験
遮光性感光材料ロールの遮光リーダを封止している粘着テープを外し、遮光リーダを引張った結果、２６Ｎの荷重の付与により、遮光リーダを遮光性感光材料ロールから外すことができた。
【００４２】
【発明の効果】
本発明の遮光性感光材料ロールは、遮光リーダの熱収縮性遮光フィルム製細片が円盤状遮光部材の外側表面に融着していることから、保存状態では遮光リーダが感光材料ロールから外れにくい。また、本発明の遮光性感光材料ロールは、遮光リーダの熱収縮性遮光フィルム製細片が引裂き可能であることから、遮光リーダを引っ張ることにより容易に感光材料シートを取り出すことができる。さらに、本発明の遮光性感光材料ロールは、遮光リーダの熱収縮性遮光フィルム製細片を、加熱することにより円盤状遮光部材に融着させることができるので、従来の遮光性感光材料ロールよりも容易に製造することができ、製造コストが安価になる。
【図面の簡単な説明】
【図１】本発明の遮光性感光材料ロールの一例の分解斜視図である。
【図２】本発明の遮光性感光材料ロールの一例の組立工程図である。
【図３】本発明の遮光性感光材料ロールの一例の部分断面図である。
【図４】本発明の遮光性感光材料ロールから感光材料シートを巻き出す操作を表した概略図である。
【符号の説明】
１感光材料ロール
２巻芯
３長尺状感光材料シート
４円盤状遮光部材
４ａキャップ
４ｂリング
５遮光リーダ
６遮光シート
７熱収縮性遮光フィルム製細片
８ａ、８ｂ粘着テープ
９ヒータ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a package of a photosensitive material roll formed by winding a long photosensitive material sheet around a core, and a light-shielding reader that can be suitably used for packaging a photosensitive material roll.
[0002]
[Prior art]
Disc-shaped light-shielding members (also called light-shielding flanges) are attached to both ends of the core of a photosensitive material roll formed by winding a sheet of photosensitive material such as long photographic paper around the core, and a light-shielding reader is attached to the outer periphery of the core. A wrapped photosensitive material roll (hereinafter referred to as a light-shielding photosensitive material roll), which can be loaded into a machine in a bright room without exposing the photosensitive material sheet, The configuration shown is known.
[0003]
In Japanese Patent No. 2899594, a photosensitive material roll, a light-shielding reader, a sealing disc, a flexible portion having a cut portion (flap-shaped segment) at the periphery thereof, and an end cap composed of a hub-shaped portion, A light-sensitive photosensitive material roll in which a light-shielding reader is wound around the material roll, the hub-shaped portion of the end cap is inserted into the hollow core of the photosensitive material roll, the flap-shaped segment is bent, and the light-shielding reader and the end cap are fixed. Has been proposed. However, in this light-shielding photosensitive material roll, the shape of the flexible part of the end cap is complicated, and an apparatus for bending the flexible part of the end cap is also required in manufacturing.
[0004]
In Japanese Patent Laid-Open No. 11-105941, a light shielding reader is attached to both end faces of a photosensitive material roll with the light shielding reader wound around the photosensitive material roll, and the peripheral portion of the disk shaped light shielding member is bent. There has been proposed a light-shielding photosensitive material roll in which a disk-shaped light-shielding member is bonded. However, this light-shielding photosensitive material roll also requires an apparatus for bending the flexible portion of the disk-shaped light-shielding member in production, as with the light-shielding photosensitive material roll proposed in Japanese Patent No. 2899594.
[0005]
In JP-A-8-62783, the light-shielding reader is partially extended to cover the outer surface of the light-shielding flange of the photosensitive material roll by winding the light-shielding reader wider than the photosensitive material while winding it around the photosensitive material roll. A light-shielding photosensitive material roll wound in this manner has been proposed. This light-shielding photosensitive material roll does not require a device for bending a disk-shaped light-shielding member or the like, but when the light-shielding reader is wound around the photosensitive material roll, the light-shielding reader is cut to stretch the light-shielding reader locally, There is a problem that it is difficult to apply a uniform tension in the width direction of the photosensitive material roll.
[0006]
In response to such a problem, the applicant of the present invention wound a long heat-shrinkable light-shielding reader that heat-shrinks in the length direction with a disk-shaped light-shielding member attached to the photosensitive material roll, and then heated the light-shielding reader. Patent application has already been filed for an invention based on the discovery that a light-shielding photosensitive material roll in which both ends of a light-shielding reader and the outer surface of a disk-shaped light-shielding member can be easily manufactured by contraction (Japanese Patent Application No. 11-50946).
[0007]
[Problems to be solved by the invention]
The light-shielding photosensitive material roll should not be detached from the photosensitive material roll so that the photosensitive material sheet is not exposed in the storage state, and the photosensitive material sheet can be easily taken out after being loaded in the machine. Is preferred. However, according to the inventor's research, in the light-shielding photosensitive material roll using the above-described long heat-shrinkable light-shielding reader, when the light-shielding reader is thermally contracted, the light-shielding reader partially melts, It has been found that it may be partially fused to the outer surface of the disk-shaped light shielding member, making it difficult to take out the photosensitive material sheet from the light-shielding photosensitive material roll. Even when the light-shielding reader is not partly fused, both ends of the light-shielding reader are wrinkled, and this part becomes a resistance, so that it is difficult to take out the photosensitive material sheet by being caught in the port port of the machine loaded with the light-shielding photosensitive material. It was also found out.
[0008]
Accordingly, an object of the present invention is to provide a light-shielding photosensitive material roll in which the light-shielding reader is not easily detached from the photosensitive material roll in the storage state, and the photosensitive material sheet can be easily taken out after being loaded in the machine. . Another object of the present invention is to provide a light-shielding reader for photosensitive material roll packaging that can be advantageously used to manufacture such a light-shielding photosensitive material roll.
[0009]
[Means for Solving the Problems]
The present invention is a photosensitive material roll formed by winding a long photosensitive material sheet around a core, and is substantially the same as the radius of the photosensitive material roll attached to each of both ends of the core of the photosensitive material roll. A disc-shaped light-shielding member having a radius, and a length that is longer than the circumference of the disc-shaped light-shielding member that is bonded to the front end portion of the long photosensitive material sheet of the photosensitive material roll, and a width that is long. The length is longer than the circumference of the disk-shaped light-shielding member along the side edge portions so as to project in the width direction on both sides of the long light-shielding sheet substantially the same as the width of the photosensitive material sheet. A value that can be torn along the length direction, has a heat shrinkage rate in the length direction of 5 to 30% at 100 ° C., and has a heat shrinkage rate in the width direction of 1% or more smaller than the heat shrinkage rate in the length direction. shielding leader heat-shrinkable light-shielding film made of strips, which are attached showing the And the projecting portion of the heat-shrinkable light-shielding film strip is fused to the outer surface over the outer peripheral edge of the disk-shaped light-shielding member mainly in a heat-shrinked state in the length direction. It is in a light-shielding photosensitive material roll.
[0010]
Preferred embodiments of the light-shielding photosensitive material roll of the present invention are shown below.
[0011]
(1) The core is hollow so that the disk-shaped light-shielding member has a ring-shaped protrusion on the surface of its central portion, and the ring-shaped protrusion contacts the inner wall of the hollow core. It is inset.
[0012]
(2) An adhesive tape is attached to the tip of the light-shielding reader, and the tip of the light-shielding reader and the outer surface of the light-shielding reader before one round are sealed with the adhesive tape.
[0013]
(3) The tearable heat-shrinkable light-shielding film strip exhibits an Elmendorf tear strength of 0.1 to 0.5 N along the length direction.
[0014]
(4) The tearable heat-shrinkable light-shielding film strip has a characteristic of being torn in a direction parallel to or away from the side edge of the light-shielding sheet when the light-shielding reader is unwound.
[0016]
( 5 ) A tearable heat-shrinkable light-shielding film strip is composed of a heat-shrinkable film and a thermoplastic light-shielding film which is laminated on each of both surface surfaces and does not substantially exhibit heat-shrinkability. .
[0017]
( 6 ) The long light-shielding sheet is made of a sheet material that does not substantially exhibit heat shrinkability.
[0018]
The present invention is also capable of tearing along the length direction along both side end portions so as to project in the width direction on both side portions of the long light-shielding sheet. And a light-shielding reader to which a strip of heat-shrinkable light-shielding film having a value that is 1% or more smaller than the heat shrinkage rate in the length direction is 5% to 30%. is there.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows an exploded perspective view of an example of the light-shielding photosensitive material roll of the present invention. The light-shielding photosensitive material roll of the present invention is attached to both ends of a photosensitive material roll 1 formed by winding a long photosensitive material sheet 3 around a core 2 and the core 2 of the photosensitive material roll. A pair of disk-shaped light-shielding members 4 for shielding light irradiated to both end faces, and the front end of the long photosensitive material sheet 3 of the photosensitive material roll 1, are wound around the outer periphery of the photosensitive material roll, and the outer periphery of the photosensitive material roll The light-shielding reader 5 that shields the light irradiated on the surface, the adhesive tape 8b that joins the light-shielding reader and the photosensitive material roll, and the adhesive tape 8a that is attached to the tip of the light-shielding reader and seals the light-shielding reader.
[0020]
The light-shielding photosensitive material roll of the present invention has a heat-shrinkable property in which the light-shielding reader 5 can be torn in the length direction along both side edges so as to protrude in the width direction on both sides of the long light-shielding sheet 6. The main feature is that the light-shielding film strips 7 are provided.
[0021]
The light shielding sheet 6 is longer than the circumference of the disk-shaped light shielding member, preferably shorter than twice the circumference of the disk-shaped light shielding member, and the width is substantially the same as the width of the long photosensitive material sheet. It is a sheet. The heat-shrinkable light-shielding film strip 7 is a film having a length longer than the circumference of the disk-shaped light-shielding member and shorter than the light-shielding sheet. The heat-shrinkable light-shielding film strip 7 is preferably provided on the surface of the light-shielding sheet 6 on the side not in contact with the photosensitive material roll.
[0022]
The light shielding sheet 6 preferably exhibits little or no heat shrinkability, and a known light shielding reader for a light shielding photosensitive material roll can be used. Specific examples of the light shielding sheet 6 include a light shielding plastic sheet such as a low-density polyethylene sheet mixed with a pigment such as carbon black.
[0023]
Heat shrinkage of the heat shrinkable light-shielding film made strip 7 is relatively not large length direction of the heat shrinkage of the film Ri width Direction good. Heat shrinkage in the longitudinal direction of the heat-shrinkable light-shielding film made of strips at 100 ° C. 5% or more, preferably 10% or more, have a size more than 1% as an absolute difference than the width direction of shrinkage . In addition, the heat shrinkage rate of the heat-shrinkable light-shielding film strip in the present invention is a value measured according to the method prescribed in JIS Z 1709-1976 (film for shrink wrapping).
[0024]
The heat-shrinkable light-shielding film strip 7 preferably has an Emmerdorf tear load in the length direction in the range of 0.1 to 0.5N. When the Emmeldorf tear load in the length direction is greater than 0.5, the heat-shrinkable light-shielding film strip is difficult to tear, and when the Emmeldorf tear load is less than 0.1 N, the light-shielding photosensitive material roll During transportation, the heat-shrinkable light-shielding film strip may tear. In addition, the Emmeldorf tear load of the strip made of heat-shrinkable light-shielding film in the present invention is a method specified in JIS K 7128-2: 1998 (Plastic Film and Sheet Tear Strength Test Method—Part 2). It is the value measured according to.
[0025]
An example of a heat-shrinkable light-shielding film strip is a heat-shrinkable transparent or translucent heat-shrinkable film (shrink film) that has a large heat-shrinkability in the length direction and can be torn in the length direction. A laminated film obtained by laminating a light-shielding film that exhibits little or no property can be mentioned, but is not limited thereto. Examples of the shrink film that can be used for the laminate-type heat-shrinkable light-shielding film are those having a grade of Fancy Wrap (trade name, manufactured by Gunze Co., Ltd.) of THS, TNS, TAS, TBS, and TRS. Can be mentioned. Moreover, examples of the light-shielding film that can be used for the laminate-type heat-shrinkable light-shielding film strip include a film such as a low-density polyethylene film mixed with a pigment such as carbon black.
[0026]
As the layer structure of the laminated heat-shrinkable light-shielding film strip, a structure in which a light-shielding film is laminated on each side surface of the heat-shrinkable film, a light-shielding film is laminated on one surface of the heat-shrinkable film The structure which laminated | stacked the heat-shrinkable film on each of the both surfaces of a structure and a light-shielding film can be mentioned. Among these layer configurations, a configuration in which a light-shielding film is laminated on each of both side surfaces of the heat-shrinkable film is preferable.
[0027]
The thickness of the heat-shrinkable light-shielding film strip is preferably 100 μm or less, particularly preferably in the range of 60 to 90 μm. In the case of a laminated heat-shrinkable light-shielding film strip, the thickness of the heat-shrinkable film is preferably in the range of 20 to 40 μm. The thickness of the light-shielding film is preferably in the range of 20 to 40 μm, and more preferably 1 μm or more thicker than the thickness of the heat-shrinkable film.
[0028]
The laminated heat-shrinkable light-shielding film strip has better tearability as the bonding strength between the heat-shrinkable film and the light-shielding film increases. The bonding strength between the heat-shrinkable film and the light-shielding film is preferably 1.5 N or more with a width of 15 mm. The bonding strength is a value measured according to a method defined in JIS Z 0237.
[0029]
There are no special restrictions on the method of manufacturing the laminated heat-shrinkable light-shielding film strip (the method of laminating the heat-shrinkable film and the light-shielding film). Extrusion laminating, dry laminating (solvent adhesive, Any of non-solvent type adhesives can be used.
[0030]
In the light-shielding photosensitive material roll of the present invention, the core 2 can be a hollow paper tube or plastic tube. Further, the disk-shaped light shielding member 4 has a light shielding property, and is not particularly limited in its material as long as it is difficult to deform when the heat-shrinkable light shielding film strip of the light shielding reader is fused to the surface thereof. There is no limit. As the disk-shaped light-shielding member 4, a flange-shaped member in which a ring-shaped protrusion is provided on the surface of the central portion is usually used. In the disk-shaped light shielding member 4, the ring-shaped protrusion and the flange portion do not have to be integrated. As shown in FIG. 1, the cap 4a may be inserted into the ring 4b, and the flange portion inner side of the cap 4a and the outer surface of the ring 4b may be bonded and fixed. The winding core 2 and the disk-shaped light-shielding member 4 are preferably attached by fitting the cap 4a of the disk-shaped light-shielding member 4 inside the core so as to be in contact with the inner wall of the hollow core. More preferably, the inner wall of the core is bonded with an adhesive.
[0031]
Conventionally, on the surface of the light-shielding reader of the light-sensitive photosensitive material roll, identification symbols indicating the type of photosensitive material (photographic emulsion), product number (lot number), etc. of the long photosensitive material sheet can be seen at a glance from the appearance. It is attached. Also in the light-shielding photosensitive material roll of the present invention, it is preferable that the identification symbol of the long photosensitive material sheet is attached to the surface of the light-shielding reader as in the prior art. Furthermore, in the light-shielding photosensitive material roll of the present invention, after use of the light-sensitive photosensitive material roll (that is, after unwinding the long photosensitive material sheet), the type of photosensitive material of the long photosensitive material sheet, It is preferable to add an identification symbol to the disk-shaped light shielding member or the core so that the product number can be seen. There is no particular limitation on the method of attaching an identification symbol to the disk-shaped light shielding member or the core. Specific examples include a method of printing and pasting an identification symbol on a label, and a method of directly printing the identification symbol with a printing machine such as an ink jet printer, a pressure-sensitive / thermal printer, or a laser marker.
[0032]
In the light-shielding photosensitive material roll of the present invention, the adhesive tape 8b for joining the light-shielding reader and the photosensitive material roll and the adhesive tape 8a attached to the tip of the light-shielding reader and sealing the light-shielding reader are not particularly limited, and are generally commercially available. Adhesive tape that is being used can be used.
[0033]
FIG. 2 shows a production process diagram of an example of the light-shielding photosensitive material roll of the present invention. The light-shielding photosensitive material roll of the present invention can be produced, for example, by the following steps.
[0034]
(1) A step of attaching the disc-shaped light shielding member 4 to each of both ends of the core 2 of the photosensitive material roll 1 and attaching the tip of the light shielding reader 5 to the tip of the long photosensitive material sheet 3 (first step). .
(2) While winding the light-shielding reader 5 around the photosensitive material roll 1, hot air is blown onto the surface of the heat-shrinkable light-shielding film strip 7 of the light-shielding reader to shrink the heat-shrinkable light-shielding film strip 7. Then, a step of contacting (adhering) the heat-shrinkable light-shielding film strip to the outer surface of the disk-shaped light-shielding member 4 (second step).
(3) A step of sealing the leading end portion of the light-shielding reader at the end of winding and the outer surface of the light-shielding reader before one turn with an adhesive tape 8a (third step).
(4) In the second step, the heater 9 is pressed against the surface of the heat-shrinkable light-shielding film strip 7 that is in contact with (adhering to) the outer surface of the disk-shaped light-shielding member. A step of fusing heat-shrinkable light-shielding film strips on the surface (fourth step).
[0035]
FIG. 3 shows a partial cross-sectional view of the light-sensitive photosensitive material roll of the present invention produced by the above process. In the light-shielding photosensitive material roll of the present invention, the inner surface of the disc-shaped light-shielding member 4 is in contact with both end surfaces of the long photosensitive material sheet 3 to shield both ends of the long photosensitive material sheet 3, thereby shielding the light-shielding reader 5. The light-shielding sheet 6 is wrapped around the photosensitive material sheet, and the heat-shrinkable light-shielding film strip 7 shields the gap between the light-shielding sheet 6 and the disk-shaped light-shielding member 4 around the outer peripheral surface of the long photosensitive material sheet 3. To do. Since the heat-shrinkable light-shielding film strip 7 of the light-shielding reader 5 is fused to the outer surface of the disk-shaped light-shielding member 4, the light-shielding reader is unlikely to come off the photosensitive material roll.
[0036]
4A to 4C are schematic views showing the operation of unwinding the photosensitive material sheet from the light-shielding photosensitive material roll of the present invention. The operation for taking out the photosensitive material sheet from the light-shielding photosensitive material roll of the present invention will be described below with reference to the drawings. By pulling the light-shielding reader 5 of the light-shielding photosensitive material roll in the direction of the arrow, the heat-shrinkable light-shielding film strip 7 of the light-shielding leader is in close contact with the light-shielding sheet 6 and the disc-shaped light-shielding member 4. A crack is formed between the portion and the portion (see FIG. 4A). In addition, in order to make it easy to produce this crack, it is preferable to provide a notch in advance on the front end side of the heat-shrinkable light-shielding film strip. When the light-shielding reader is pulled further, the crack of the light-shielding reader is extended, and the light-shielding reader is torn from the light-shielding photosensitive material roll (see FIG. 4B). When the heat-shrinkable light-shielding film strip 7 of the light-shielding reader is completely torn, the long photosensitive material sheet 3 can be taken out by pulling the light-shielding reader (see FIG. 4C).
[0037]
When unwinding the light-shielding reader by tearing the heat-shrinkable light-shielding film strip from the light-shielding photosensitive material roll, place the heat-shrinkable light-shielding film strip in the direction parallel to the side edge of the light-shielding sheet or the side edge. It is preferable to tear away from the part. By thus tearing the heat-shrinkable light-shielding film strip, the long photosensitive material sheet is conveyed (when the long photosensitive material sheet is unwound and when it is unwound, the long photosensitive material sheet is once unwound). May be rewound onto the core again), but is less likely to be disturbed by the heat-shrinkable light-shielding film strip remaining on the disk-shaped light-shielding member side.
[0038]
The direction in which the heat-shrinkable light-shielding film strip is torn is affected by the orientation of the heat-shrinkable light-shielding film strip. Therefore, when attaching the heat-shrinkable light-shielding film strip to the light-shielding sheet, the orientation of the heat-shrinkable light-shielding film strip is parallel to the side edge of the light-shielding sheet, Alternatively, the orientation is preferably a direction away from the side edge of the light-shielding sheet toward the side to be bonded to the long photosensitive material sheet when the light-shielding reader is used.
In addition, when the heat-shrinkable light-shielding film strip is a laminated type, a film having substantially no orientation is used for the light-shielding film, and the heat-shrinkable light-shielding film strip is formed by the orientation of the heat-shrinkable film (shrink film). It is preferred to determine the orientation.
[0039]
【Example】
[Example 1]
(Manufacture of shading readers)
A heat-shrinkable light-shielding film made by bonding a light-shielding film (a low-density polyethylene sheet with a thickness of 30 μm mixed with 5% by weight of carbon black) on both sides of a 30 μm-thick shrink film (TNS, manufactured by Gunze Co., Ltd.) Strips were produced. The heat-shrinkable light-shielding film strips obtained had a thermal shrinkage rate of 13.3% in the length direction and 11.9% in the width direction at 100 ° C., and the Elmendorf tear load in the length direction was 0.00. 43N. The heat-shrinkable light-shielding film strips are respectively attached to both sides of a light-shielding sheet obtained by laminating a low-density polyethylene sheet having a thickness of 40 μm mixed with 5% by weight of carbon black on both surfaces of a PET sheet having a thickness of 100 μm. A light-shielding reader was manufactured by sticking along both side edges so as to protrude in the width direction.
[0040]
(Manufacture of light-shielding photosensitive material roll)
The light shielding reader was bonded to the tip of the photosensitive material roll with an adhesive tape, and disk-shaped light shielding members were attached to both ends of the photosensitive material roll. Next, while winding the light-shielding reader of the roll-shaped photosensitive material around the periphery of the photosensitive material roll, hot air at 270 ° C. is blown onto the surface of the heat-shrinkable light-shielding film strip of the light-shielding reader. The strip was brought into contact with the outer surface beyond the outer peripheral edge of the disk-shaped light-shielding member in a thermally contracted state. Then, after sealing the tip of the winding end of the light-shielding reader and the outer surface of the light-shielding reader before one turn, a thin film made of a heat-shrinkable light-shielding film that is in close contact with the outer surface of the disk-shaped light-shielding member A heater heated to 130 ° C. was pressed against the surface of the piece to fuse the outer surface of the disk-shaped light shielding member and the heat-shrinkable light-shielding film strip.
[0041]
[Evaluation]
(1) Light-shielding test of roll-shaped photosensitive material package After the light-sensitive photosensitive material roll is allowed to stand for 1 hour under 1000 lux, the photosensitive material sheet is taken out of the roll-shaped photosensitive material package, and the exposure state of the photosensitive material investigated. As a result, the photosensitive material sheet was not exposed.
(2) Test for taking out photosensitive material sheet of light-shielding photosensitive material roll As a result of removing the adhesive tape sealing the light-shielding leader of the light-shielding photosensitive material roll and pulling the light-shielding reader, the light-shielding reader Was removed from the light-shielding photosensitive material roll.
[0042]
【The invention's effect】
In the light-shielding photosensitive material roll of the present invention, the heat-shrinkable light-shielding film strip of the light-shielding reader is fused to the outer surface of the disk-shaped light-shielding member. . In the light-shielding photosensitive material roll of the present invention, since the heat-shrinkable light-shielding film strip of the light-shielding reader can be torn, the photosensitive material sheet can be easily taken out by pulling the light-shielding leader. Furthermore, the light-shielding photosensitive material roll of the present invention can heat and melt the heat-shrinkable light-shielding film strip of the light-shielding reader to the disc-shaped light-shielding member by heating. Can be easily manufactured, and the manufacturing cost is low.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of an example of a light-shielding photosensitive material roll of the present invention.
FIG. 2 is an assembly process diagram of an example of a light-shielding photosensitive material roll of the present invention.
FIG. 3 is a partial cross-sectional view of an example of a light-shielding photosensitive material roll of the present invention.
FIG. 4 is a schematic view showing an operation of unwinding a photosensitive material sheet from the light-shielding photosensitive material roll of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Photosensitive material roll 2 Core 3 Long photosensitive material sheet 4 Disc shaped light shielding member 4a Cap 4b Ring 5 Light shielding leader 6 Light shielding sheet 7 Heat-shrinkable light-shielding film strips 8a and 8b Adhesive tape 9 Heater

Claims

A photosensitive material roll in which a long photosensitive material sheet is wound around the core, and a disc having a radius substantially the same as the radius of the photosensitive material roll attached to each of both ends of the core of the photosensitive material roll The light-shielding member, and the length of the long photosensitive material sheet bonded to the tip of the long photosensitive material sheet of the photosensitive material roll is longer than the circumference of the disk-shaped light shielding member. The length is longer than the circumference of the disk-shaped light-shielding member and along the length direction, along the side edge portions so as to project in the width direction on both sides of the long light-shielding sheet substantially the same as the width. The heat shrinkage in the length direction at 100 ° C. is in the range of 5 to 30%, and the heat shrinkage in the width direction is 1% or more smaller than the heat shrinkage in the length direction. Including a light-shielding reader to which a strip made of light-shielding film is attached The light-shielding photosensitive material, wherein the projecting portion of the heat-shrinkable light-shielding film strip is fused to the outer surface of the strip-shaped light-shielding member in the state of being thermally contracted mainly in the length direction. Material roll.

The core is hollow, and the disc-shaped light shielding member has a ring-shaped projection on the surface of its central portion, and is inserted into the core so that the ring-shaped projection contacts the inner wall of the hollow core. The light-shielding photosensitive material roll according to claim 1, wherein

The light-shielding light-sensitive material according to claim 1, wherein the tearable heat-shrinkable light-shielding film strip exhibits an Elmendorf tear strength of 0.1 to 0.5 N along the length direction. roll.

The heat-shrinkable light-shielding film strip that can be torn is characterized by tearing in the direction parallel to or away from the side edge of the light-shielding sheet when the light-shielding leader is unwound. The light-shielding photosensitive material roll according to claim 1.

The tearable heat-shrinkable light-shielding film strip is composed of a heat-shrinkable film and a thermoplastic light-shielding film that does not exhibit substantially heat-shrinkability and is laminated on each of both side surfaces thereof. The light-shielding photosensitive material roll according to claim 1.

It can be torn along the length direction along both end portions so as to project in the width direction on both sides of the long light-shielding sheet, and the heat shrinkage rate in the length direction at 100 ° C. is 5 to 30%. A light-shielding reader comprising a heat-shrinkable light-shielding film strip attached with a heat shrinkage rate in the width direction of 1% or more smaller than the heat shrinkage rate in the length direction.

The light-shielding reader according to claim 6, wherein the tearable heat-shrinkable light-shielding film strip exhibits an Elmendorf tear strength of 0.1 to 0.5 N along its length.