JPH0392846A - Coating liquid applying method - Google Patents
Coating liquid applying methodInfo
- Publication number
- JPH0392846A JPH0392846A JP23022189A JP23022189A JPH0392846A JP H0392846 A JPH0392846 A JP H0392846A JP 23022189 A JP23022189 A JP 23022189A JP 23022189 A JP23022189 A JP 23022189A JP H0392846 A JPH0392846 A JP H0392846A
- Authority
- JP
- Japan
- Prior art keywords
- coating
- org
- solvents
- curtain
- web
- 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.)
- Granted
Links
- 238000000576 coating method Methods 0.000 title claims abstract description 39
- 239000011248 coating agent Substances 0.000 title claims abstract description 30
- 239000007788 liquid Substances 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 title claims description 17
- 239000000463 material Substances 0.000 claims abstract description 8
- 238000004519 manufacturing process Methods 0.000 claims abstract description 4
- 238000007766 curtain coating Methods 0.000 claims description 8
- 239000003960 organic solvent Substances 0.000 claims description 5
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 abstract description 12
- 239000000654 additive Substances 0.000 abstract description 5
- 239000000839 emulsion Substances 0.000 abstract description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 abstract description 4
- -1 silver halide Chemical class 0.000 abstract description 4
- 239000000975 dye Substances 0.000 abstract description 3
- 239000004094 surface-active agent Substances 0.000 abstract description 3
- 150000001298 alcohols Chemical class 0.000 abstract description 2
- 230000001235 sensitizing effect Effects 0.000 abstract description 2
- 229910052709 silver Inorganic materials 0.000 abstract description 2
- 239000004332 silver Substances 0.000 abstract description 2
- 230000003595 spectral effect Effects 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 2
- 239000002904 solvent Substances 0.000 abstract 4
- 230000001771 impaired effect Effects 0.000 abstract 1
- 239000011324 bead Substances 0.000 description 18
- 239000010410 layer Substances 0.000 description 6
- 239000010408 film Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000011241 protective layer Substances 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 108010010803 Gelatin Proteins 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000009501 film coating Methods 0.000 description 1
- 229920000159 gelatin Polymers 0.000 description 1
- 239000008273 gelatin Substances 0.000 description 1
- 235000019322 gelatine Nutrition 0.000 description 1
- 235000011852 gelatine desserts Nutrition 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
Classifications
-
- 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
- B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
- B05C5/007—Slide-hopper coaters, i.e. apparatus in which the liquid or other fluent material flows freely on an inclined surface before contacting the work
- B05C5/008—Slide-hopper curtain coaters
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は連続走行している帯状支持体（以下ウエブとい
う）に塗布液を塗布する方法に関し、さらに詳しくはカ
ーテン塗布方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method of applying a coating liquid to a continuously running strip-shaped support (hereinafter referred to as a web), and more particularly to a curtain coating method.
塗布方法には種々の方法、例えば浸漬法、ダブルロール
法、エアドクター法さらにスライドビード法等があるが
、特に写真感光材料においては、カラー感光材料をはじ
め多層構戊のものが多く．、塗布方式としても多層塗布
可能なスライドビード法が一般的に用いられている。し
かしながらスライドビード法のようなビ〜ドコーターに
おいては、ウエプと塗布装置の間隙の均一性が塗布性に
対し大きな影響を与える。したがってウエブは一般的に
剛性のロール等に密着して搬送され、ビード間隙を保持
する。ざらにビードの安定性を高めるために種々の改良
が施され、例えばビードの上下に圧力差（主として下方
への減圧）を設ける等の技術が発達してきた。しかしな
がら、ウエブの塗布されるべき面の反対面またはパッキ
ングロールの表面に付着または埋没した異物が、ウエプ
が塗布部を通過する際、ビード間隙を狭めることとなり
、はん点状の塗布むらを生ずる。またウエプの継ぎ目の
通過、あるいはウエブ搬送ロールの偏心、搬送モータの
駆動むら等ビードが乱される要因は多い。これらはいず
れも塗布むらの原因になり、ビード塗布方式の重大な欠
陥である。There are various coating methods, such as the dipping method, double roll method, air doctor method, and slide bead method, but especially for photographic light-sensitive materials, many of them have a multilayer structure, including color light-sensitive materials. As a coating method, a slide bead method that allows multilayer coating is generally used. However, in bead coaters such as the slide bead method, the uniformity of the gap between the web and the coating device has a large effect on coating properties. Therefore, the web is generally conveyed in close contact with rigid rolls or the like to maintain bead gaps. Various improvements have been made to roughly increase the stability of the bead, and techniques such as providing a pressure difference (mainly downward pressure reduction) between the top and bottom of the bead have been developed. However, foreign matter attached to or embedded in the surface of the web opposite to the surface to be coated or on the surface of the packing roll narrows the bead gap when the web passes through the coating section, resulting in spot-like uneven coating. . Furthermore, there are many factors that can cause the bead to be disturbed, such as passage of the web through a seam, eccentricity of the web conveyance roll, and uneven driving of the conveyance motor. All of these causes uneven coating, which is a serious defect in the bead coating method.
これに対し、間隙が広く、スライドビード法のような厳
密な間隙制御の必要がなく、多層同時塗布可能な塗布方
法としては、自由落下カーテン方式による塗布方式もよ
く知られている。すなわち塗布液を薄膜状にして一定速
度以上でウエブに衝突せしめて塗布する方法であり、例
えば特公昭４９−１４１３０号、同４９−２４１３３号
、同４９−３５４４７号、特開昭５０７６１５１号等に
その技術が開示されている。On the other hand, a coating method using a free-falling curtain method is also well known as a coating method that has a wide gap, does not require strict gap control like the slide bead method, and allows simultaneous multilayer coating. That is, it is a method of coating by making a coating liquid into a thin film and colliding it with the web at a constant speed or higher. The technology has been disclosed.
しかしながら、写真感光材料の場合においてこのような
カーテン塗布方法を用いても、尚塗布むらを発生する場
合があり問題となっている。However, even when such a curtain coating method is used in the case of photographic light-sensitive materials, uneven coating may still occur, which is a problem.
上記のごとき問題に対し、本発明の目的は、カーテン塗
布方式における塗布むらの発生を防止できる塗布方法を
提供することである。In order to solve the above problems, an object of the present invention is to provide a coating method that can prevent the occurrence of uneven coating in the curtain coating method.
本発明の上記目的は、カーテン泣布法を用いた写真感光
材料の製造方法において、塗布液中の有機溶剤の含有量
を５％以下とすることを特徴とする塗布方法により達成
される。The above object of the present invention is achieved by a coating method for manufacturing a photographic light-sensitive material using a curtain cloth method, which is characterized in that the content of an organic solvent in the coating solution is 5% or less.
以下本発明につき具体的に説明する。The present invention will be specifically explained below.
第１図はスライドビード塗布方式、第２図はカーテン塗
布方式のそれぞれ１例を示す断面図である。FIG. 1 is a sectional view showing an example of a slide bead coating method, and FIG. 2 is a sectional view showing an example of a curtain coating method.
第１図においては、塗布機のスライド面５を流下した塗
布液１３及び１４はビードｌ２を介してウエブｌＯ上に
塗布される。この場合塗布機リップ部６とウエブとの間
隙すなわちビード間隙の安定性が問題となる。In FIG. 1, the coating liquids 13 and 14 flowing down the slide surface 5 of the coating machine are applied onto the web 10 via the bead 12. In this case, the stability of the gap between the coater lip 6 and the web, that is, the bead gap, becomes a problem.
第２図においては第１図におけるスライドホッパー塗布
機と同じ機構のものでこの場合はビードをつくらず、ウ
エブ上に塗布液を流下し塗布するのが特徴である。なお
図中のＮｏは第１図と同じである。The slide hopper coater shown in FIG. 2 has the same mechanism as the slide hopper coater shown in FIG. 1, and is characterized in that it does not create a bead, but instead lets the coating liquid flow down onto the web. Note that the numbers in the figure are the same as in FIG. 1.
本発明においては、塗布は単層にとどまらず多層を同時
に塗布する場合であってもよい。In the present invention, the coating is not limited to a single layer, but may be a case in which multiple layers are coated simultaneously.
また薄膜状塗布液は自由落下させるのでなく、ウエブに
向けて塗布液を一定以上の速度で噴出させてもよい。Further, instead of allowing the thin film coating liquid to fall freely, the coating liquid may be jetted toward the web at a speed higher than a certain level.
ハロゲン化銀写真感光材料の製造においては、写真乳剤
中に必要に応じて分光増感色素、界面活性剤、カプラー
等多数の添加剤を加えるが、これらの中には水に難溶性
のものもあり、メタノール、エタノール等のアルコール
類をはじめとする各種有機溶剤が用いられている。しか
し、本発明等は鋭意検討の結果、これらの有機溶剤を多
く用いるとカーテン塗布においては流下液膜の安定性が
著しく損なわれることを見いだし、塗布液中の有機溶剤
含有量を５ｖｔ％以下にすることによりこの問題を解決
し得ることを明らかにした。In the production of silver halide photographic materials, a large number of additives such as spectral sensitizing dyes, surfactants, couplers, etc. are added to the photographic emulsion as necessary, but some of these additives are poorly soluble in water. Various organic solvents are used, including alcohols such as methanol and ethanol. However, as a result of intensive studies, the present inventors have discovered that the use of large amounts of these organic solvents significantly impairs the stability of the falling liquid film in curtain coating. It has been shown that this problem can be solved by doing this.
以下、実施例により本発明の効果を例証する。 Hereinafter, the effects of the present invention will be illustrated by examples.
実施例
第２図に示した装置により、２層同時塗布を行っｔこ
。Example Two layers were simultaneously coated using the apparatus shown in Figure 2.
.
塗布速度： １２０ｍ／ｗｉｎ ，カーテン高さ ：７
ｃｒａ支持体 ：下引処理した１００μｍ厚みのポリエ
チレンテレフタレート
保護！！層（上層）：ゼラチン溶液に界面活性剤、増粘
剤及び硬膜剤を添加した保護
膜液。Coating speed: 120m/win, curtain height: 7
CRA support: 100 μm thick polyethylene terephthalate protection with subbing treatment! ! Layer (upper layer): A protective film liquid made by adding a surfactant, a thickener, and a hardening agent to a gelatin solution.
乳剤層（下層）二色素溶解用として２ｖｏｌ％のメタノ
ールを含有する写真用乳剤。Emulsion layer (lower layer) A photographic emulsion containing 2 vol% methanol for dissolving two dyes.
上記のごとき構成の感光材料において保護層中の添加剤
溶解用として下記量のメタノールを使用しｌこ 。In the photosensitive material having the above structure, the following amount of methanol was used to dissolve additives in the protective layer.
ａ ： ５．８ｖｏｌ％
ｂ ： ４．Ｏｖｏｌ％
ｃ ： ２．Ｏｖｏｌ％
これらの構戊条件での保護層及び乳剤層を同時塗布した
結果
ａ：流下液膜中に不規則な縦筋状の乱れが睨察され、塗
布結果として濃度むらが強く、製品化不可のレベルであ
る。a: 5.8vol% b: 4. Ovol%c: 2. Ovol% Results of simultaneous coating of the protective layer and emulsion layer under these structural conditions a: Irregular vertical streak-like disturbances were observed in the falling liquid film, and as a result of the coating, there was strong density unevenness, making it impossible to commercialize. level.
ｂ：上記むらはほとんど観察されず製品として実用上問
題のないレベルである。b: The above-mentioned unevenness is almost not observed and is at a level that poses no practical problem as a product.
Ｃ：上記の様なむらはまったく観察されず極めて良好な
レベルである。C: The above unevenness was not observed at all and the level was very good.
上記の結果、ｂ，ｃの条件であれば実用可であり、有機
溶剤の量は５％以下、好ましくは２％以十である。As a result of the above, conditions b and c are practical, and the amount of organic solvent is 5% or less, preferably 2% or more.
本発明により、カーテン塗布方式における塗布むらの発
生を防止できる塗布方法を提供することができた。According to the present invention, it was possible to provide a coating method that can prevent the occurrence of coating unevenness in the curtain coating method.
第１図はスライドビード塗布機の１例を示す断面図、第
２図はカーテン塗布機の１例を示す断面図である。
２：スライドホッパ−（スライドビード）塗布機５：ス
ライド面 ＩＯ：ウエブ
ｌ１：塗布膜 １２：ビードFIG. 1 is a sectional view showing an example of a slide bead coating machine, and FIG. 2 is a sectional view showing an example of a curtain coating machine. 2: Slide hopper (slide bead) coating machine 5: Slide surface IO: Web l1: Coating film 12: Bead
Claims (1)
て、自由落下区間において気液界面を有する塗布液中の
有機溶剤の含有量を５％以下とすることを特徴とする塗
布方法。A method for producing a photographic material using a curtain coating method, characterized in that the content of an organic solvent in a coating solution having a gas-liquid interface in a free fall zone is 5% or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1230221A JP2896684B2 (en) | 1989-09-05 | 1989-09-05 | Application method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1230221A JP2896684B2 (en) | 1989-09-05 | 1989-09-05 | Application method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0392846A true JPH0392846A (en) | 1991-04-18 |
| JP2896684B2 JP2896684B2 (en) | 1999-05-31 |
Family
ID=16904455
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1230221A Expired - Fee Related JP2896684B2 (en) | 1989-09-05 | 1989-09-05 | Application method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2896684B2 (en) |
-
1989
- 1989-09-05 JP JP1230221A patent/JP2896684B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2896684B2 (en) | 1999-05-31 |
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