JP2011210288A - 磁気記録媒体の製造装置、磁気記録媒体の製造方法、及び、磁気記録媒体 - Google Patents
磁気記録媒体の製造装置、磁気記録媒体の製造方法、及び、磁気記録媒体 Download PDFInfo
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Abstract
【解決手段】帯状の支持体に、支持体上に形成された非磁性層と、非磁性層上に形成された磁性層とを含む磁気記録媒体の製造装置であって、搬送される支持体上に非磁性塗布液を塗布し、非磁性塗布層を形成する非磁性塗布液塗布部と、非磁性塗布液塗布部において形成された非磁性塗布層を乾燥させ、非磁性層を形成する第1乾燥部と、第1乾燥部において形成された非磁性層上に磁性材料を含む磁性塗布液を塗布し、磁性塗布層を形成する磁性塗布液塗布部と、磁性塗布液塗布部において形成された磁性塗布層に含まれる磁性粒子を配向する配向部と、第1乾燥部から配向部の間に配置され、搬送されている支持体を冷却する冷却手段と、を有する。
【選択図】図2
Description
搬送される前記支持体上に非磁性塗布液を塗布し、非磁性塗布層を形成する非磁性塗布液塗布部と、
前記非磁性塗布液塗布部において形成された前記非磁性塗布層を乾燥させ、前記非磁性層を形成する第1乾燥部と、
前記第1乾燥部において形成された前記非磁性層上に磁性材料を含む磁性塗布液を塗布し、磁性塗布層を形成する磁性塗布液塗布部と、
前記磁性塗布液塗布部において形成された前記磁性塗布層に含まれる磁性粒子を配向する配向部と、
前記第1乾燥部から前記配向部の間に配置され、搬送されている前記支持体を冷却する冷却手段と、を有する製造装置である。
搬送される前記支持体上に非磁性塗布液を塗布し、非磁性塗布層を形成する非磁性塗布液塗布工程と、
前記非磁性塗布液塗布部において形成された前記非磁性塗布層を乾燥させ、前記非磁性層を形成する第1乾燥工程と、
前記第1乾燥部において形成された前記非磁性層上に磁性材料を含む磁性塗布液を塗布し、磁性塗布層を形成する磁性塗布液塗布工程と、
前記磁性塗布液塗布部において形成された前記磁性塗布層に含まれる磁性粒子を配向する配向工程と、
前記非磁性塗布液塗布工程の終了後、配向工程の開始前に、前記支持体を18℃以下とする冷却工程と、を有する製造方法である。
製造される磁気テープMTは、支持体B上に、非磁性層1と、磁性層2とが積層されている。
製造装置10は、長尺帯状の支持体Bが巻回された送り出しロール11と、非磁性層と磁性層とが順に形成された支持体Bを巻き取りロール19を有し、送り出しロール11から送り出された支持体Bを搬送経路に沿って搬送しながら、磁気テープを製造するものである。
この例では、搬送区間Pcにおいて、塗布液磁性層塗布液塗布部14の下流側で、配向部20の上流側に、冷却手段として機能する冷却ローラ32と、冷却ローラ32の温度調整を行なう制御部34が配置されている。
この例では、搬送区間Pcには、塗布液磁性層塗布液塗布部14の磁性塗布液を吐出する塗布ヘッド及び磁性塗布液のうち少なくとも一方の温度を調整する制御部38が設けられている。制御部38は、塗布ヘッド及び磁性塗布液のうち少なくとも一方を10℃以上、23℃以下に温度調整する。
平均板状比[(板径/板厚)の算術平均]は1〜15であり、更に1〜7であることが好ましい。
平均板状比が1〜15であれば、磁性層で高充填性を保持しながら充分な配向性が得られ、かつ、粒子間のスタッキングによるノイズ増大を抑えることができる。また、上記粒子サイズの範囲内におけるBET法による比表面積(SBET)は、40m2/g以上が好ましく、40〜200m2/gであることが更に好ましく、60〜100m2/gであることが最も好ましい。
本発明者は、製造時の支持体の温度と、磁性層の厚みと、電磁変換特性との関係を調べるため、次のような測定を行った。
カーボンブラック(平均粒径:25nm) 20部
電子線硬化型塩化ビニル共重合樹脂 10部
電子線硬化型ポリウレタン樹脂 5部
フェニルホスホン酸 2部
メチルエチルケトン 130部
シクロヘキサノン 100部
ステアリン酸 1部
ステアリン酸ブチル 1.5部
Hc:2000Oe(160kA/m)
平均板径:20nm
平均板状比:3
BET比表面積:80m2/g
σs:50emu/g(50A・m2/kg)
スルホン酸基含有ポリウレタン樹脂 18部
ダイヤモンド粉末(平均粒径:50nm) 1部
炭化ケイ素粉末(平均粒径:30nm) 1部
シクロヘキサノン 150部
メチルエチルケトン 150部
ブチルステアレート 2部
ステアリン酸 1部
支持体の温度を18℃とした場合には、磁性層の厚みが70〜100nmであるとき、角型比は0.70以上であって、配向が良好に行われたことがわかった。また、磁性層の厚みが50nmでは角型比は0.69であり、飽和には達しないものの、配向が十分に行われたことがわかった。この結果、18℃までは、50nm(乾燥後厚み)で良好な配向が行われることがわかった。
支持体の温度を23℃と場合には、磁性層の厚みが100nmであるとき、角型比は0.69以上であったが、磁性層の厚みが50〜70nmであるとき、角型比は0.67以下となり、配向が不良であり、電磁変換特性が劣化することがわかった。
(1)帯状の支持体に、前記支持体上に形成された非磁性層と、前記非磁性層上に形成された磁性層とを含む磁気記録媒体の製造装置であって、
搬送される前記支持体上に非磁性塗布液を塗布し、非磁性塗布層を形成する非磁性塗布液塗布部と、
前記非磁性塗布液塗布部において形成された前記非磁性塗布層を乾燥させ、前記非磁性層を形成する第1乾燥部と、
前記第1乾燥部において形成された前記非磁性層上に磁性材料を含む磁性塗布液を塗布し、磁性塗布層を形成する磁性塗布液塗布部と、
前記磁性塗布液塗布部において形成された前記磁性塗布層に含まれる磁性粒子を配向する配向部と、
前記第1乾燥部から前記配向部の間に配置され、搬送されている前記支持体を冷却する冷却手段と、を有する製造装置。
(2)(1)に記載の製造装置であって、
前記冷却手段は、前記支持体に、10℃以上、23℃以下のエアを吹き付ける製造装置。
(3)(1)に記載の製造装置であって、
前記冷却手段は、前記支持体に当接し、10℃以上、23℃以下に調整された搬送ロールである製造装置。
(4)(1)に記載の製造装置であって、
前記冷却手段は、前記磁性塗布液塗布部において前記磁性塗布液を吐出する塗布ヘッド及び前記磁性塗布液のうち少なくとも一方を、10℃以上、23℃以下に調整する製造装置。
(5)(1)から(4)のいずれか1つに記載の製造装置であって、
前記配向部における配向後に、前記磁性塗布層の乾燥を行う第2乾燥部を有する製造装置。
(6)帯状の支持体に、前記支持体上に形成された非磁性層と、前記非磁性層上に形成された磁性層とを含む磁気記録媒体の製造方法であって、
搬送される前記支持体上に非磁性塗布液を塗布し、非磁性塗布層を形成する非磁性塗布液塗布工程と、
前記非磁性塗布液塗布部において形成された前記非磁性塗布層を乾燥させ、前記非磁性層を形成する第1乾燥工程と、
前記第1乾燥部において形成された前記非磁性層上に磁性材料を含む磁性塗布液を塗布し、磁性塗布層を形成する磁性塗布液塗布工程と、
前記磁性塗布液塗布部において形成された前記磁性塗布層に含まれる磁性粒子を配向する配向工程と、
前記非磁性塗布液塗布工程の終了後、配向工程の開始前に、前記支持体を18℃以下とする冷却工程と、を有する製造方法。
(7)(6)に記載の製造方法であって、
前記冷却工程では、前記支持体に、10℃以上、23℃以下のエアを吹き付けて冷却する製造方法。
(8)(7)に記載の製造方法であって、
前記エアが乾燥風である製造方法。
(9)(7)に記載の製造方法であって、
前記冷却工程では、前記支持体に、10℃以上、23℃以下に調整された搬送ロールを当接させて冷却する製造方法。
(10)(7)に記載の製造方法であって、
前記冷却工程では、前記支持体に前記磁性塗布液を吐出する塗布ヘッド及び前記磁性塗布液のうち少なくとも一方を、10℃以上、23℃以下に調整する製造方法。
(11)(6)から(10)のいずれか1つに記載の製造方法であって、
前記配向部における配向後に、前記磁性塗布層の乾燥を行う第2乾燥工程を有する製造方法。
(12)(6)から(11)のいずれか1つに記載の製造方法によって得られる磁気記録媒体。
14 磁性塗布液塗布部
20 配向部
30 冷却部
Claims (12)
- 帯状の支持体に、前記支持体上に形成された非磁性層と、前記非磁性層上に形成された磁性層とを含む磁気記録媒体の製造装置であって、
搬送される前記支持体上に非磁性塗布液を塗布し、非磁性塗布層を形成する非磁性塗布液塗布部と、
前記非磁性塗布液塗布部において形成された前記非磁性塗布層を乾燥させ、前記非磁性層を形成する第1乾燥部と、
前記第1乾燥部において形成された前記非磁性層上に磁性材料を含む磁性塗布液を塗布し、磁性塗布層を形成する磁性塗布液塗布部と、
前記磁性塗布液塗布部において形成された前記磁性塗布層に含まれる磁性粒子を配向する配向部と、
前記第1乾燥部から前記配向部の間に配置され、搬送されている前記支持体を冷却する冷却手段と、を有する製造装置。 - 請求項1に記載の製造装置であって、
前記冷却手段は、前記支持体に、10℃以上、23℃以下のエアを吹き付ける製造装置。 - 請求項1に記載の製造装置であって、
前記冷却手段は、前記支持体に当接し、10℃以上、23℃以下に調整された搬送ロールである製造装置。 - 請求項1に記載の製造装置であって、
前記冷却手段は、前記磁性塗布液塗布部において前記磁性塗布液を吐出する塗布ヘッド及び前記磁性塗布液のうち少なくとも一方を、10℃以上、23℃以下に調整する製造装置。 - 請求項1から4のいずれか1項に記載の製造装置であって、
前記配向部における配向後に、前記磁性塗布層の乾燥を行う第2乾燥部を有する製造装置。 - 帯状の支持体に、前記支持体上に形成された非磁性層と、前記非磁性層上に形成された磁性層とを含む磁気記録媒体の製造方法であって、
搬送される前記支持体上に非磁性塗布液を塗布し、非磁性塗布層を形成する非磁性塗布液塗布工程と、
前記非磁性塗布液塗布部において形成された前記非磁性塗布層を乾燥させ、前記非磁性層を形成する第1乾燥工程と、
前記第1乾燥部において形成された前記非磁性層上に磁性材料を含む磁性塗布液を塗布し、磁性塗布層を形成する磁性塗布液塗布工程と、
前記磁性塗布液塗布部において形成された前記磁性塗布層に含まれる磁性粒子を配向する配向工程と、
前記非磁性塗布液塗布工程の終了後、配向工程の開始前に、前記支持体を18℃以下とする冷却工程と、を有する製造方法。 - 請求項6に記載の製造方法であって、
前記冷却工程では、前記支持体に、10℃以上、23℃以下のエアを吹き付けて冷却する製造方法。 - 請求項7に記載の製造方法であって、
前記エアが乾燥風である製造方法。 - 請求項7に記載の製造方法であって、
前記冷却工程では、前記支持体に、10℃以上、23℃以下に調整された搬送ロールを当接させて冷却する製造方法。 - 請求項7に記載の製造方法であって、
前記冷却工程では、前記支持体に前記磁性塗布液を吐出する塗布ヘッド及び前記磁性塗布液のうち少なくとも一方を、10℃以上、23℃以下に調整する製造方法。 - 請求項6から10のいずれか1項に記載の製造方法であって、
前記配向部における配向後に、前記磁性塗布層の乾燥を行う第2乾燥工程を有する製造方法。 - 請求項6から11のいずれか1項に記載の製造方法によって得られる磁気記録媒体。
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