JP4951301B2 - 光学フィルムの乾燥方法及び装置並びに光学フィルムの製造方法 - Google Patents
光学フィルムの乾燥方法及び装置並びに光学フィルムの製造方法 Download PDFInfo
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
- F26B13/10—Arrangements for feeding, heating or supporting materials; Controlling movement, tension or position of materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
- B05C9/08—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation
- B05C9/14—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation the auxiliary operation involving heating or cooling
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/005—Treatment of dryer exhaust gases
- F26B25/006—Separating volatiles, e.g. recovering solvents from dryer exhaust gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B3/00—Drying solid materials or objects by processes involving the application of heat
- F26B3/28—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun
- F26B3/283—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun in combination with convection
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B3/00—Drying solid materials or objects by processes involving the application of heat
- F26B3/28—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun
- F26B3/30—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun from infrared-emitting elements
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Microbiology (AREA)
- Textile Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Coating Apparatus (AREA)
- Drying Of Solid Materials (AREA)
Description
なお、σはステファン−ボルツマン定数(5.670×10−8W/m2K4)を表し、ηは伝熱効率(熱放射率)を表す。
なお、λは空気の伝熱係数(W/K)である。
光学補償シートの製造ラインにおける塗布層の乾燥工程を、塗布面近傍の風の流れを防止するケーシングで囲ったドライヤ16を塗布直後の走行位置に配設して、光学補償シートを製造する上での好適なドライヤ16内での加熱条件を検討した。
1)透明フィルムの送出工程;
2)透明フィルムの表面に配向膜形成用樹脂を含む塗布液を塗布、乾燥する配向膜形成用樹脂層の形成工程;
3)表面に配向膜形成用樹層が形成された透明フィルム上に、樹脂層の表面にラビング処理を施し透明フィルム上に配向膜を形成するラビング工程;
4)液晶性ディスコティック化合物を含む塗布液を、配向膜上に塗布する液晶性ディスコティック化合物の塗布工程;
5)前記塗布膜を乾燥して該塗布膜中の溶媒を蒸発させる乾燥工程;
6)前記塗布膜をディスコティックネマティック相形成温度に加熱して、ディスコティックネマティック相の液晶層を形成する液晶層形成工程;
7)前記液晶層を固化する(すなわち、液晶層形成後急冷して固化させるか、または、架橋性官能基を有する液晶性ディスコティック化合物を使用した場合には液晶層を光照射(または加熱)により架橋させる)工程;
8)該配向膜及び液晶層が形成された透明フィルムを巻き取る巻取り工程。
(nx−ny)×d=16nm、
{(nx−ny)/2−nz}×d=75nmであった。また、上記配向膜形成用樹脂層の形成の際に、本発明に係るドライヤ16を備えた塗布・乾燥ラインを用いて行なった。
実施例2〜10及び比較例1〜10においては、赤外線ヒータ40、41、42の表面温度、ウェブ11と赤外線ヒータ40、41、42との間の間隔を、表1のように設定したこと以外は、実施例1と同様である。
表1が示すように、実施例1〜10においては、いずれも乾燥ムラに基づくスジ故障の発生は見られなかった。特に、実施例2〜6が示すように、赤外線ヒータ40、41、42から塗布層15に供給される全熱量のうち、塗布層15に放射伝熱により供給される熱量の割合が0.30〜0.50の場合には、乾燥ムラの発生はなく均一な塗膜品質を有するフィルムが得られることがわかった。
Claims (7)
- 走行する帯状可撓性支持体に塗布された有機溶剤含有塗布液の塗布膜を乾燥させる光学フィルムの乾燥方法において、
塗布直後の走行位置に前記帯状可撓性支持体と対向する位置にヒータを設け、該ヒータで前記帯状可撓性支持体を加熱するとともに、
前記帯状可撓性支持体の表面温度TW(℃)、前記ヒータの表面温度TH(℃)、空気の伝熱係数λ(W/m・K)、前記ヒータと前記帯状可撓性支持体の距離をd(m)、前記帯状可撓性支持体の伝熱効率η、ステファン−ボルツマン定数σとした際に、
空気伝熱QC=λ/d・(TH−TW)、
放射伝熱QR=ησ{(TH+273)4−(TW+273)4}、
を用いて表される放射伝熱の割合QR/(QR+QC)が0.25以上0.6以下であり、
前記ヒータと前記帯状可撓性支持体との間の距離dは、1mm以上10mm以下であり、
前記有機溶剤含有塗布液中の有機溶剤の組成比が50質量%以上であり、
前記塗布膜の塗布ウェット膜厚が50μm以下であり、
前記ヒータはドライヤ内に設けられ、前記ドライヤは、前記有機溶剤含有塗布液の塗布直後から前記帯状可撓性支持体の走行方向で2m以内に配置され、
前記帯状可撓性支持体の走行速度が10m/分以上100m/分以下であることを特徴とする光学フィルムの乾燥方法。 - 前記ヒータは、1μm以上15μm以下の波長を有する赤外線の放射率が90%以上である赤外線ヒータであることを特徴とする請求項1に記載の光学フィルムの乾燥方法。
- 前記ヒータの表面温度は、80℃以上130℃以下であることを特徴とする請求項1又は2に記載の光学フィルムの乾燥方法。
- 請求項1〜3のいずれか1つに記載の光学フィルムの乾燥方法によって光学フィルムを製造することを特徴とする光学フィルムの製造方法。
- 走行する帯状可撓性支持体に塗布された有機溶剤含有塗布液の塗布膜を乾燥させる光学フィルムの乾燥装置において、
塗布直後の走行位置に配設され、前記帯状可撓性支持体と対向する位置にヒータを備え、
前記帯状可撓性支持体の表面温度TW(℃)、前記ヒータの表面温度TH(℃)、空気の伝熱係数λ(W/m・K)、前記ヒータと前記帯状可撓性支持体の距離をd(m)、前記帯状可撓性支持体の伝熱効率η、ステファン−ボルツマン定数σとした際に、
空気伝熱QC=λ/d・(TH−TW)、
放射伝熱QR=ησ{(TH+273)4−(TW+273)4}、
を用いて表される放射伝熱の割合QR/(QR+QC)が0.25以上0.6以下であり、
前記ヒータと前記帯状可撓性支持体との間の距離dは、1mm以上10mm以下であり、
前記有機溶剤含有塗布液中の有機溶剤の組成比が50質量%以上であり、
前記塗布膜の塗布ウェット膜厚が50μm以下であり、
前記ヒータはドライヤ内に設けられ、前記ドライヤは、前記有機溶剤含有塗布液の塗布直後から前記帯状可撓性支持体の走行方向で2m以内に配置され、
前記帯状可撓性支持体の走行速度が10m/分以上100m/分以下であることを特徴とする光学フィルムの乾燥装置。 - 前記ヒータは、1μm以上15μm以下の波長を有する赤外線の放射率が90%以上である赤外線ヒータであることを特徴とする請求項5に記載の光学フィルムの乾燥装置。
- 前記ヒータの表面温度は、80℃以上130℃以下であることを特徴とする請求項5又は6に記載の光学フィルムの乾燥装置。
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JP2006259659A JP4951301B2 (ja) | 2006-09-25 | 2006-09-25 | 光学フィルムの乾燥方法及び装置並びに光学フィルムの製造方法 |
KR1020070095185A KR101366626B1 (ko) | 2006-09-25 | 2007-09-19 | 코팅필름의 건조방법 및 장치, 그리고 광학필름의 제조방법 |
CN2007101612414A CN101152644B (zh) | 2006-09-25 | 2007-09-25 | 干燥涂布膜的方法和设备以及制造光学膜的方法 |
US11/902,735 US7526878B2 (en) | 2006-09-25 | 2007-09-25 | Method and apparatus for drying coating film and method for producing optical film |
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EP2610567A1 (en) * | 2003-03-26 | 2013-07-03 | Fujifilm Corporation | Drying method for a coating layer |
DE102004044176A1 (de) * | 2004-09-13 | 2006-03-30 | BSH Bosch und Siemens Hausgeräte GmbH | Trocknungsverfahren für ein Haushaltsgerät und Haushaltsgerät zur Durchführung des Trocknungsverfahren |
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KR20080027730A (ko) | 2008-03-28 |
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JP2008080183A (ja) | 2008-04-10 |
CN101152644B (zh) | 2012-08-08 |
CN101152644A (zh) | 2008-04-02 |
KR101366626B1 (ko) | 2014-02-24 |
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