JP2000126663A - Curtain coating device and coating method - Google Patents

Curtain coating device and coating method

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Publication number
JP2000126663A
JP2000126663A JP10305175A JP30517598A JP2000126663A JP 2000126663 A JP2000126663 A JP 2000126663A JP 10305175 A JP10305175 A JP 10305175A JP 30517598 A JP30517598 A JP 30517598A JP 2000126663 A JP2000126663 A JP 2000126663A
Authority
JP
Japan
Prior art keywords
coating
curtain
liquid
edge guide
film
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP10305175A
Other languages
Japanese (ja)
Inventor
Toshihito Maruyama
利仁 丸山
Hirotaka Kashiwada
浩貴 柏田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Paper Mills Ltd
Original Assignee
Mitsubishi Paper Mills Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Paper Mills Ltd filed Critical Mitsubishi Paper Mills Ltd
Priority to JP10305175A priority Critical patent/JP2000126663A/en
Publication of JP2000126663A publication Critical patent/JP2000126663A/en
Pending legal-status Critical Current

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  • Application Of Or Painting With Fluid Materials (AREA)
  • Coating Apparatus (AREA)

Abstract

PROBLEM TO BE SOLVED: To stably form a curtain film to edge guides to enable stable, high speed coating by making a contact angle of the edge guides to water the specified one or less when supporting one layer of coating liquid by the edge guides at both side ends thereof. SOLUTION: In curtain coating, a thin film of coating liquid is formed on the surface of a slide by uniformly feeding coating liquid from slits 5, and while this thin film like coating liquid is kept in a thin film state, it is made to fall along a pair of edge guides 6 that plastic material such as polystyrene as well as metals such as stainless steel and aluminum is used and is hit against a supporting body 2 supported on a coating roller 1 and conveyed to perform coating. At this time, a contact angle of the surface in contact with the coating liquid of the edge guides 6 to water is made to be 10 degrees or less. In this way, even if auxiliary liquid is not fed to the edge guides 6, a curtain film 7 can be stably formed to enable stable, high speed coating.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、カーテン塗布装置
及び塗布方法に関する。
The present invention relates to a curtain coating apparatus and a coating method.

【0002】[0002]

【従来の技術】カーテン塗布方法は、連続的に走行する
ウェブに塗布液膜を自由落下させて塗布する方法であ
り、基本技術として特公昭49−24133号、同49
−35447号公報に開示されている。
2. Description of the Related Art A curtain coating method is a method in which a coating liquid film is freely dropped onto a continuously running web and coated thereon.
-35447.

【0003】高速塗布化に伴い、乾燥負荷低減の目的で
塗布液の濃縮が要求されるようになってきた。塗布液の
濃縮化により塗布液粘度が増大する。カーテン塗布方法
は、塗布液膜をエッジガイドに沿って鉛直下方に自然落
下させるため粘性抵抗の作用により、エッジガイド近傍
に速度勾配が生じ、縮流が発生するようになる。
[0003] With the application of high-speed coating, it has been required to concentrate a coating solution for the purpose of reducing the drying load. Concentration of the coating solution increases the viscosity of the coating solution. In the curtain coating method, since the coating liquid film naturally falls vertically downward along the edge guide, a velocity gradient is generated near the edge guide due to the action of viscous resistance, and a contraction occurs.

【0004】かかる現象を回避するために種々の方法及
び装置が開示されている。例えば、特公昭49−354
47号、特開平1−199668号、同平6−2060
34号公報には、低粘度の補助液をエッジガイドに沿っ
て供給する方法が記載されている。これらの方法によっ
て、低塗布量で安定した塗布液膜が得られるが、新たに
補助液供給手段が必要となり、更に余剰液が塗布液膜両
端部に厚塗り部を生じさせるため、別途余剰液を除去す
るための手段も必要になる。また、補助液供給による脈
動が塗布液膜に伝搬し、塗布ムラを生じさせるという問
題を有している。
[0004] Various methods and devices have been disclosed to avoid such phenomena. For example, Japanese Patent Publication No. 49-354
No. 47, JP-A-1-199668, JP-A-6-2060
No. 34 discloses a method of supplying a low-viscosity auxiliary liquid along an edge guide. By these methods, a stable coating liquid film can be obtained with a low coating amount, but a new auxiliary liquid supply unit is required, and since the excess liquid causes thick coating portions at both ends of the coating liquid film, the excess liquid is separately added. Also means for removing the In addition, there is a problem that the pulsation due to the supply of the auxiliary liquid propagates to the coating liquid film to cause coating unevenness.

【0005】[0005]

【発明が解決しようとする課題】従って、本発明の目的
は、エッジガイドへ補助液を供給しなくとも、安定的に
カーテン膜を形成し、安定な高速塗布を可能にするカー
テン塗布装置及び塗布方法を提供することにある。本発
明の他の目的は、高粘度の塗布液に好適なカーテン塗布
方法を提供することにある。
SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a curtain coating apparatus and a coating apparatus capable of stably forming a curtain film and supplying stable high-speed coating without supplying an auxiliary liquid to an edge guide. It is to provide a method. Another object of the present invention is to provide a curtain coating method suitable for a high-viscosity coating solution.

【0006】[0006]

【課題を解決するための手段】本発明の上記目的は、下
記の塗布装置及び塗布方法によって達成された。 (1)少なくとも1層の塗布液をエッジガイドで両側端
を支えて、該塗布液の自由落下塗布液膜を形成して支持
体上に塗布するカーテン塗布装置において、前記エッジ
ガイドの水に対する接触角を10度以下にせしめたこと
を特徴とするカーテン塗布装置。 (2)前記(1)の塗布装置において、前記エッジガイ
ドが光触媒を含有する表面層を有することを特徴とする
カーテン塗布装置。 (3)少なくとも1層の塗布液をエッジガイドで両側端
を支えて、該塗布液の自由落下塗布液膜を形成して支持
体上に塗布するカーテン塗布方法において、前記エッジ
ガイドの前記塗布液との接触面の水に対する接触角を1
0度以下にせしめたことを特徴とするカーテン塗布方
法。 (4)少なくとも1層の塗布液をエッジガイドで両側端
を支えて、該塗布液の自由落下塗布液膜を形成して支持
体上に塗布するカーテン塗布方法において、前記エッジ
ガイドの前記塗布液との接触面が光触媒を含有する表面
層を有し、該表面層の水との接触角を10度以下にせし
めたことを特徴とするカーテン塗布方法。
The object of the present invention has been attained by the following coating apparatus and coating method. (1) In a curtain coating apparatus in which at least one layer of a coating solution is supported on both sides by an edge guide and a free-falling coating solution film of the coating solution is formed and applied on a support, contact of the edge guide with water A curtain coating apparatus characterized in that the angle is set to 10 degrees or less. (2) The curtain coating device according to (1), wherein the edge guide has a surface layer containing a photocatalyst. (3) In a curtain coating method in which at least one layer of a coating liquid is supported on both sides by an edge guide and a free-falling coating liquid film of the coating liquid is formed and applied on a support, the coating liquid of the edge guide is provided. The contact angle of the contact surface with water to water is 1
A curtain coating method, wherein the temperature is set to 0 degrees or less. (4) In a curtain coating method in which at least one layer of the coating liquid is supported on both sides by an edge guide, a free-falling coating liquid film of the coating liquid is formed and coated on a support, the coating liquid of the edge guide is provided. A contact surface with a photocatalyst has a surface layer containing a photocatalyst, and the contact angle of the surface layer with water is set to 10 degrees or less.

【0007】[0007]

【発明の実施の形態】以下、本発明を詳細に説明する。
一般的なカーテン塗布装置の斜視図を図1に示す。カー
テン塗布は、スライド面4上に、スリット5から均一に
塗布液を供給することによって塗布液の薄膜を形成し、
この薄膜状塗布液を薄膜状態を保ったまま、1対のエッ
ジガイド6に沿わせて落下させ、コーティングローラ1
に支持されて搬送する支持体2に衝突させて塗布が行わ
れる。ここで、エッジガイドは塗布液のカーテン膜を形
成させる上で必須である。また、高粘度の塗布液の場
合、エッジガイドとカーテン膜との間の縮流を防止し、
安定的なカーテン膜を形成させるために、前述したよう
に補助液(フラッシング液とも云う)が必要であった。
BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
FIG. 1 shows a perspective view of a general curtain coating apparatus. Curtain coating forms a thin film of the coating liquid on the slide surface 4 by uniformly supplying the coating liquid from the slit 5,
The thin film coating solution is dropped along the pair of edge guides 6 while keeping the thin film state, and the coating roller 1
The coating is carried out by colliding with the support 2 which is supported and conveyed. Here, the edge guide is indispensable for forming a curtain film of the coating liquid. In addition, in the case of a high-viscosity coating liquid, the contraction between the edge guide and the curtain film is prevented,
In order to form a stable curtain film, an auxiliary liquid (also called a flushing liquid) was required as described above.

【0008】本発明は、前記補助液をエッジガイドに供
給しなくても、安定的にカーテン膜を形成する方法の開
発に向けられたものであり、かかる課題がエッジガイド
表面の水との接触角を極度に低下させるとによって達成
されることを見いだした。
The present invention is directed to the development of a method for forming a curtain film stably without supplying the auxiliary liquid to the edge guide. It has been found that this can be achieved by extremely reducing the angle.

【0009】従来、エッジガイドの材質は、特開平4−
94761号、特公平4−46629号公報に記載され
ているように、ステンレスやアルミニウム等の金属が一
般的であるが、他にポリエチレン、ポリテトラフルオロ
エチレン等のプラスチックやゴム等の材質も知られてい
る。これらの材質の水との接触角は、いずれも30度以
上である。
Conventionally, the material of the edge guide is disclosed in
As described in Japanese Patent No. 94761 and Japanese Patent Publication No. 4-46629, metals such as stainless steel and aluminum are generally used, but other materials such as plastics such as polyethylene and polytetrafluoroethylene and rubbers are also known. ing. The contact angle of any of these materials with water is 30 degrees or more.

【0010】本発明は、エッジガイドの塗布液と接する
面(以降、接液面という)の水との接触角を10度以下
にする。好ましくは5度以下にする。本発明において、
接触角とは20℃の水滴を滴下してから30秒後の接触
角である。該接触角は、協和界面科学(株)社製の自動
接触角計(FACE CA-Z)で測定することができる。本発
明のエッジガイド接液面の水との接触角を10度以下に
することの作用、効果について、以下に考察する。
According to the present invention, the contact angle of the surface of the edge guide in contact with the coating liquid (hereinafter referred to as the liquid contact surface) with water is set to 10 degrees or less. Preferably, it is set to 5 degrees or less. In the present invention,
The contact angle is a contact angle 30 seconds after a 20 ° C water drop is dropped. The contact angle can be measured by an automatic contact angle meter (FACE CA-Z) manufactured by Kyowa Interface Science Co., Ltd. The operation and effect of reducing the contact angle of the edge guide liquid contact surface with water of the present invention to 10 degrees or less will be discussed below.

【0011】図2はカーテン膜の落下速度の分布を示し
たものである。エッジガイド6によって形成されたカー
テン膜7には、落下方向の矢印で示すような速度勾配が
生じる。これは、一般に液体は粘性をもっているため流
れが固体壁(エッジガイド)に接している場合、固体壁
上では速度が0になり、このため固体(エッジガイド)
近傍では速度勾配のある領域、即ち、境界層8ができる
からであるとされている。カーテン塗布の場合、自由落
下であるため大部分の領域で一様な速度をもっていると
考えられるが、両端のエッジガイド近傍では境界層8が
発達し速度勾配が生じている。この境界層8は、下流に
行くにつれてその幅が大きくなる。このとき、矢印9で
示す水平方向への流れ(以降、水平流という)が生じ、
この水平流が大きくなるとカーテン膜が破壊される。
FIG. 2 shows the distribution of the falling speed of the curtain film. The curtain film 7 formed by the edge guide 6 has a velocity gradient as indicated by the arrow in the falling direction. This is because when a liquid is generally viscous and the flow is in contact with a solid wall (edge guide), the velocity becomes zero on the solid wall, and thus the solid (edge guide)
This is because a region with a velocity gradient, that is, a boundary layer 8 is formed in the vicinity. In the case of curtain coating, since it is free fall, it is considered that the speed is uniform in most regions. However, near the edge guides at both ends, the boundary layer 8 develops and a speed gradient occurs. The width of the boundary layer 8 increases as going downstream. At this time, a horizontal flow indicated by an arrow 9 (hereinafter referred to as a horizontal flow) occurs.
When this horizontal flow becomes large, the curtain film is broken.

【0012】上記したように、境界層の発達は水平流を
生じさせやすく、その結果カーテン膜の形成を不安定に
し、ひいてはカーテン膜の破壊を起こす。境界層の発達
は、塗布液の粘度、特に高せん断時の粘度の影響を受け
る。高せん断粘度が高い場合に、境界層の幅が大きくな
り、カーテン膜の破壊へとつながる。従って、高せん断
粘度が高い場合は、前述したように、エッジガイドの接
液面に補助液を流して、境界層の発達を抑制する方法が
従来から採られている。
As described above, the development of the boundary layer tends to cause a horizontal flow, which makes the formation of the curtain film unstable, and eventually causes the breakage of the curtain film. The development of the boundary layer is affected by the viscosity of the coating solution, particularly at high shear. When the high shear viscosity is high, the width of the boundary layer increases, leading to breakage of the curtain film. Therefore, when the high shear viscosity is high, as described above, a method of flowing the auxiliary liquid to the liquid contact surface of the edge guide to suppress the development of the boundary layer has been conventionally adopted.

【0013】図3に補助液を用いたときのカーテン膜の
落下速度分布を示す。エッジガイド6とカーテン膜7と
の間に補助液10を介在させることによって、カーテン
膜7の端縁、即ち補助液との接触面に速度11が生じ
る。これによって、境界層8の発達が抑制され、水平流
が防止できる。
FIG. 3 shows a falling velocity distribution of the curtain film when the auxiliary liquid is used. By interposing the auxiliary liquid 10 between the edge guide 6 and the curtain film 7, a velocity 11 is generated at the edge of the curtain film 7, that is, at the contact surface with the auxiliary liquid. Thereby, development of the boundary layer 8 is suppressed, and horizontal flow can be prevented.

【0014】本発明は、補助液の作用とは別の観点から
検討した。即ち、補助液による境界層の発達を抑制する
というのではなく、境界層の発達によって生じる水平流
(エッジガイドからカーテン膜中央への水平方向の流
れ)に対抗するだけの力を付与するというコンセプトの
基に研究し、エッジガイド接液面の表面エネルギーを高
くするという技術思想を導き出した。エッジガイドの表
面エネルギーを高くすることによって、エッジガイドに
カーテン膜が引き寄せられ、その結果、カーテン膜の水
平方向の流れが均衡し、安定なカーテン膜が得られると
考えられる。
The present invention has been studied from a viewpoint different from the function of the auxiliary liquid. In other words, the concept is not to suppress the development of the boundary layer due to the auxiliary liquid, but to apply a force sufficient to oppose the horizontal flow (horizontal flow from the edge guide to the center of the curtain film) caused by the development of the boundary layer. And developed a technical idea of increasing the surface energy of the edge guide liquid contact surface. It is considered that by increasing the surface energy of the edge guide, the curtain film is attracted to the edge guide, and as a result, the horizontal flow of the curtain film is balanced and a stable curtain film is obtained.

【0015】本発明において、水平流に対抗するのに必
要なエッジガイド接液面の表面エネルギーの強さは、水
との接触角で表される。即ち、水との接触角が低いほど
表面エネルギーは高く、本発明はエッジガイド接液面の
水との接触角が10度以下を必須とする。好ましくは5
度以下である。
In the present invention, the strength of the surface energy of the liquid surface contacting the edge guide required to counter the horizontal flow is represented by the contact angle with water. That is, the lower the contact angle with water, the higher the surface energy, and the present invention requires that the contact angle of the edge guide liquid contact surface with water be 10 degrees or less. Preferably 5
Degrees or less.

【0016】本発明は、高せん断時(せん断速度が60
0sec-1以上)の粘度が20cps以上の塗布液に有効
であるが、粘度が低い塗布液であっても、カーテン膜形
成の安定化に寄与する。本発明は、前述したように、補
助液を用いなくても安定なカーテン膜が得られるが、本
発明のエッジガイドに補助液を用いてもよい。その場
合、更なる効果が期待できる。
According to the present invention, high shearing (when the shear rate is 60
( 0 sec -1 or more) is effective for a coating solution having a viscosity of 20 cps or more, but even a coating solution having a low viscosity contributes to stabilization of curtain film formation. In the present invention, as described above, a stable curtain film can be obtained without using an auxiliary liquid, but an auxiliary liquid may be used for the edge guide of the present invention. In that case, a further effect can be expected.

【0017】エッジガイド接液面の水との接触角を10
度以下にする手段は、特に限定されないが、好ましくは
光触媒を用いることである。光触媒とは、その結晶の伝
導帯と価電子帯との間のエネルギーギャップよりも大き
なエネルギー(即ち短い波長)の光(励起光)を照射し
たときに、価電子帯中の電子の励起(光励起)が生じ
て、伝導電子と正孔を生成しうる物質をいい、酸化チタ
ン(アナターゼ型及びルチル型)、酸化錫、酸化亜鉛、
三酸化二ビスマス、三酸化タングステン、酸化第二鉄、
チタン酸ストロンチウムが好適に用いられる。この中で
も特に酸化チタンが好ましい。ここで光触媒の光励起に
用いる光源としては、太陽光、蛍光灯、紫外光、メタル
ハライドランプ、水銀ランプ、キセノンランプ等があ
る。詳細には、特開平9−224793号、同平9−2
26042号、同平9−227178号、同平9−23
0118号公報に記載されている。
The contact angle of the edge guide liquid contact surface with water is set to 10
Means for lowering the temperature is not particularly limited, but preferably uses a photocatalyst. When a photocatalyst is irradiated with light (excitation light) having an energy (that is, a shorter wavelength) larger than the energy gap between the conduction band and the valence band of the crystal, excitation of electrons in the valence band (photoexcitation) is performed. ) Is a substance that can generate conduction electrons and holes by generating titanium oxide (anatase type and rutile type), tin oxide, zinc oxide,
Bismuth trioxide, tungsten trioxide, ferric oxide,
Strontium titanate is preferably used. Of these, titanium oxide is particularly preferred. Here, light sources used for photoexcitation of the photocatalyst include sunlight, fluorescent lamps, ultraviolet light, metal halide lamps, mercury lamps, xenon lamps, and the like. For details, see JP-A-9-224793,
No. 26042, No. 9-227178, No. 9-23
No. 0118.

【0018】本発明への光触媒の適用は、上記特開公報
に準じた方法を用いることができる。例えば、ステンレ
ス製のエッジガイドの接液面に、特開平9−22604
2号の実施例1に記載の光触媒粒子(酸化チタン)を含
有する層が塗布されたポリエチレンテレフタレートフィ
ルムを貼り付ける。または上記光触媒粒子を含有する層
を単独もしくは他の層とともに、エッジガイド接液面に
直接塗布する。
The photocatalyst can be applied to the present invention by a method according to the above-mentioned Japanese Unexamined Patent Publication. For example, a liquid contact surface of a stainless steel edge guide is described in Japanese Patent Application Laid-Open No. 9-22604.
A polyethylene terephthalate film coated with a layer containing the photocatalyst particles (titanium oxide) described in Example 1 of No. 2 is attached. Alternatively, the layer containing the photocatalyst particles is applied alone or together with another layer directly to the edge guide contact surface.

【0019】また、光触媒粒子を用いたフィルムが市販
されており、それをエッジガイドに貼り合わせてもよ
い。市販フィルムとしては、例えば、東陶機器(株)社
製のハイドロテクトフィルム等がある。
Also, a film using photocatalyst particles is commercially available, and it may be bonded to an edge guide. As a commercially available film, for example, there is a Hydrotect film manufactured by Tohki Kiki Co., Ltd.

【0020】光触媒(例えば酸化チタン)に適当な組成
を組み合わせた薄膜表面に、光(例えば紫外線)を当て
ると、接触角が減少し最後には0度となり、更にその後
数十時間は紫外線を照射しなくても、接触角は数度程度
を維持するので、長時間の連続塗布に好適である。ま
た、暗室での塗布が必要なハロゲン化銀感光材料等の連
続塗布にも好適である。
When light (for example, ultraviolet rays) is applied to the surface of a thin film obtained by combining a photocatalyst (for example, titanium oxide) with an appropriate composition, the contact angle is reduced to 0 degrees at the end, and the ultraviolet rays are irradiated for several tens of hours thereafter. Even if this is not done, the contact angle is maintained at about several degrees, which is suitable for long-time continuous application. It is also suitable for continuous coating of a silver halide photosensitive material or the like which requires coating in a dark room.

【0021】本発明において、エッジガイド本体の材質
は特に限定されないが、強度、寸法精度、加工精度等の
面からステンレスが好ましい。エッジガイドの形状は、
丸棒、角柱棒、平板等が用いられるが、好ましくは接液
面の幅が5〜30mm程度の平板である。
In the present invention, the material of the edge guide body is not particularly limited, but stainless steel is preferable in terms of strength, dimensional accuracy, processing accuracy and the like. The shape of the edge guide is
A round bar, a prismatic bar, a flat plate, or the like is used, but a flat plate having a liquid contact surface width of about 5 to 30 mm is preferable.

【0022】本発明に用いられるカーテン塗布装置は、
特徴とするエッジガイド接液面以外は前記図1に示すよ
うな一般的な塗布装置と概略同じであってよい。塗布液
をスライド面4に供給するスリット5は、積層する層の
数に応じて設けられる。本発明の塗布方法に適用できる
塗布液は、ハロゲン化銀写真感光材料、感熱紙、感圧
紙、磁気記録材料、インクジェット記録用材料等が挙げ
られ、これらの塗布層は、1層から十数層に及ぶ場合が
あり、いずれも適用できる。
The curtain coating device used in the present invention comprises:
Except for the edge guide liquid contact surface, which is a feature, it may be substantially the same as a general coating apparatus as shown in FIG. The slits 5 for supplying the application liquid to the slide surface 4 are provided according to the number of layers to be laminated. Examples of the coating solution applicable to the coating method of the present invention include silver halide photographic materials, heat-sensitive paper, pressure-sensitive paper, magnetic recording materials, and ink-jet recording materials. And all of them can be applied.

【0023】[0023]

【実施例】以下、本発明を実施例にて詳細に説明する
が、これらに限定されるものではない。 実施例1 図1に示す塗布装置を用いて、下記条件で塗布した。 支持体:厚み170μmのポリエチレン樹脂被覆紙 カーテン高さ:10cm 塗布液:インクジェット記録用材料のインク受容層の塗布液 ゼラチン 50重量部 カルボキシメチルセルロース 50重量部 ジ−2−エチルヘキシルスルホコハク酸ソーダ 0.1重量部 せん断速度が600sec-1の時の粘度が50cps、及
び100cpsになるように水で全量を調整した。 塗布量:50ml/m2(湿潤状態で) 塗布速度:200m/分 塗布幅:1000mm
EXAMPLES The present invention will be described in detail with reference to the following Examples, but it should not be construed that the invention is limited thereto. Example 1 Using the coating apparatus shown in FIG. 1, coating was performed under the following conditions. Support: 170 μm-thick polyethylene resin-coated paper Curtain height: 10 cm Coating solution: Coating solution for ink receiving layer of ink jet recording material Gelatin 50 parts by weight Carboxymethyl cellulose 50 parts by weight Di-2-ethylhexyl sodium sulfosuccinate 0.1 part by weight Part The total amount was adjusted with water so that the viscosity at a shear rate of 600 sec -1 was 50 cps and 100 cps. Coating amount: 50 ml / m 2 (in a wet state) Coating speed: 200 m / min Coating width: 1000 mm

【0024】下記のエッジガイドを用意した。 エッジガイドA:接液面の幅20mmのステンレス製の
平板 エッジガイドB:上記エッジガイドAの接液面に、光触
媒を用いた東陶機器(株)社製のハイドロテクトフィル
ムを貼り付けた。
The following edge guide was prepared. Edge guide A: Stainless steel flat plate having a liquid contact surface width of 20 mm Edge guide B: A hydrotect film manufactured by Totoki Kiki Co., Ltd. using a photocatalyst was attached to the liquid contact surface of the edge guide A.

【0025】エッジガイドBのハイドロテクトフィルム
面に当てる光(紫外光)の照射量を調整して、水との接
触角が表1になるようなエッジガイドB1〜B4を作成
した。水との接触角は、協和界面科学(株)社製の自動
接触角計(FACE CA-Z)を用いて測定した。
By adjusting the amount of light (ultraviolet light) applied to the surface of the hydroprotect film of the edge guide B, edge guides B1 to B4 were prepared so that the contact angle with water was as shown in Table 1. The contact angle with water was measured using an automatic contact angle meter (FACE CA-Z) manufactured by Kyowa Interface Science Co., Ltd.

【0026】上記のそれぞれのエッジガイドを用いて、
50cpsの塗布液と100cpsの塗布液を塗布した
ときの塗布状態を下記の基準で評価した。その結果を表
1に示す。 ◎:全く問題なし。 ○:両端部(耳部)が僅かに中央に寄り、塗布幅が正常
幅より2〜4mm短い。 △:両端部が中央に寄り、塗布幅が正常幅より10〜20mm
短い。 ×:両端部が大きく中央に寄り、塗布幅が正常幅より40
mm以上短い。
Using each of the above edge guides,
The coating conditions when the 50 cps coating solution and the 100 cps coating solution were applied were evaluated according to the following criteria. Table 1 shows the results. A: No problem at all. :: Both ends (ears) are slightly shifted toward the center, and the coating width is 2 to 4 mm shorter than the normal width. Δ: Both ends are close to the center, and the coating width is 10 to 20 mm from the normal width
short. ×: Both ends are largely shifted toward the center, and the application width is 40 than the normal width.
mm or shorter.

【0027】[0027]

【表1】 [Table 1]

【0028】上記結果より、エッジガイド接液面の水と
の接触角を10度以下にすることによって、補助液を用
いなくても安定なカーテン膜を形成できることが分か
る。従って、補助液を用いることによる前述した不都合
が解消できる。特に、本発明は高せん断時の粘度が20
cps以上の場合に好適である。
From the above results, it is understood that a stable curtain film can be formed without using an auxiliary liquid by setting the contact angle of the edge guide liquid contact surface with water to 10 degrees or less. Therefore, the above-mentioned disadvantage caused by using the auxiliary liquid can be solved. In particular, the present invention has a viscosity at high shear of 20.
It is suitable for the case of cps or more.

【0029】[0029]

【発明の効果】本発明は、エッジガイドへ補助液を供給
しなくとも、安定なカーテン膜が形成でき、安定な高速
塗布を可能にする。特に高せん断時の粘度20cps以
上の塗布液に好適である。
According to the present invention, a stable curtain film can be formed without supplying an auxiliary liquid to the edge guide, and stable high-speed coating can be performed. Particularly, it is suitable for a coating solution having a viscosity of 20 cps or more at high shear.

【図面の簡単な説明】[Brief description of the drawings]

【図1】カーテン塗布装置の斜視図。FIG. 1 is a perspective view of a curtain coating device.

【図2】カーテン膜の落下速度分布を示す図。FIG. 2 is a diagram showing a falling velocity distribution of a curtain film.

【図3】補助液を用いたときのカーテン膜の落下速度分
布を示す図。
FIG. 3 is a diagram showing a falling velocity distribution of a curtain film when an auxiliary liquid is used.

【符号の説明】[Explanation of symbols]

2 支持体 3 塗布装置 4 スライド面 5 スリット 6 エッジガイド 7 カーテン膜 2 support 3 coating device 4 slide surface 5 slit 6 edge guide 7 curtain film

Claims (5)

【特許請求の範囲】[Claims] 【請求項1】 少なくとも1層の塗布液をエッジガイド
で両側端を支えて、該塗布液の自由落下塗布液膜を形成
して支持体上に塗布するカーテン塗布装置において、前
記エッジガイドの水に対する接触角を10度以下にせし
めたことを特徴とするカーテン塗布装置。
1. A curtain coating apparatus in which at least one layer of a coating liquid is supported on both sides by an edge guide to form a free-falling coating liquid film of the coating liquid and apply the coating liquid on a support, A curtain coating device, wherein the contact angle with the curtain is 10 degrees or less.
【請求項2】 前記エッジガイドが光触媒を含有する表
面層を有することを特徴とする請求項1に記載のカーテ
ン塗布装置。
2. The curtain coating apparatus according to claim 1, wherein the edge guide has a surface layer containing a photocatalyst.
【請求項3】 少なくとも1層の塗布液をエッジガイド
で両側端を支えて、該塗布液の自由落下塗布液膜を形成
して支持体上に塗布するカーテン塗布方法において、前
記エッジガイドの前記塗布液との接触面の水に対する接
触角を10度以下にせしめたことを特徴とするカーテン
塗布方法。
3. A curtain coating method in which at least one layer of a coating liquid is supported on both sides by an edge guide to form a free-falling coating liquid film of the coating liquid and coat the coating on a support, A curtain coating method, wherein a contact angle of a contact surface with a coating liquid to water is set to 10 degrees or less.
【請求項4】 少なくとも1層の塗布液をエッジガイド
で両側端を支えて、該塗布液の自由落下塗布液膜を形成
して支持体上に塗布するカーテン塗布方法において、前
記エッジガイドの前記塗布液との接触面が光触媒を含有
する表面層を有し、該表面層の水との接触角を10度以
下にせしめたことを特徴とするカーテン塗布方法。
4. A curtain coating method in which at least one layer of a coating solution is supported on both sides by an edge guide to form a free-falling coating solution film of the coating solution and apply the coating solution onto a support, the curtain coating method comprising: A curtain coating method, wherein a contact surface with a coating liquid has a surface layer containing a photocatalyst, and a contact angle of the surface layer with water is set to 10 degrees or less.
【請求項5】 塗布液の粘度が、せん断速度600se
-1以上のとき20cps以上である請求項3または4
に記載のカーテン塗布方法。
5. The method according to claim 1, wherein the viscosity of the coating solution is 600 sec.
5. When the value is c -1 or more, the value is 20 cps or more.
4. The curtain coating method according to 1.
JP10305175A 1998-10-27 1998-10-27 Curtain coating device and coating method Pending JP2000126663A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10305175A JP2000126663A (en) 1998-10-27 1998-10-27 Curtain coating device and coating method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10305175A JP2000126663A (en) 1998-10-27 1998-10-27 Curtain coating device and coating method

Publications (1)

Publication Number Publication Date
JP2000126663A true JP2000126663A (en) 2000-05-09

Family

ID=17941971

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10305175A Pending JP2000126663A (en) 1998-10-27 1998-10-27 Curtain coating device and coating method

Country Status (1)

Country Link
JP (1) JP2000126663A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1061412A1 (en) * 1999-06-15 2000-12-20 Fuji Photo Film Co., Ltd. Curtain coating apparatus
JP2008018386A (en) * 2006-07-14 2008-01-31 Ricoh Co Ltd Curtain coating apparatus and curtain coating method
JP2009172471A (en) * 2008-01-22 2009-08-06 Voith Patent Gmbh Edge guide of curtain coater
JP2010269204A (en) * 2009-05-19 2010-12-02 Ricoh Co Ltd Curtain coating method and device
JP2011173091A (en) * 2010-02-25 2011-09-08 Tokyo Electron Ltd Coating apparatus and method of cleaning nozzle

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1061412A1 (en) * 1999-06-15 2000-12-20 Fuji Photo Film Co., Ltd. Curtain coating apparatus
US6454858B1 (en) 1999-06-15 2002-09-24 Fuji Photo Film Co., Ltd. Curtain coating apparatus
JP2008018386A (en) * 2006-07-14 2008-01-31 Ricoh Co Ltd Curtain coating apparatus and curtain coating method
JP2009172471A (en) * 2008-01-22 2009-08-06 Voith Patent Gmbh Edge guide of curtain coater
JP2010269204A (en) * 2009-05-19 2010-12-02 Ricoh Co Ltd Curtain coating method and device
JP2011173091A (en) * 2010-02-25 2011-09-08 Tokyo Electron Ltd Coating apparatus and method of cleaning nozzle

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