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JP3814838B2 - Application method - Google Patents
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JP3814838B2 - Application method - Google Patents

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Publication number
JP3814838B2
JP3814838B2 JP16392595A JP16392595A JP3814838B2 JP 3814838 B2 JP3814838 B2 JP 3814838B2 JP 16392595 A JP16392595 A JP 16392595A JP 16392595 A JP16392595 A JP 16392595A JP 3814838 B2 JP3814838 B2 JP 3814838B2
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Japan
Prior art keywords
coating
support
long support
temperature
wind
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JP16392595A
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Japanese (ja)
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JPH0910669A (en
Inventor
雄一郎 前原
和浩 福田
篤志 斉藤
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Konica Minolta Inc
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Konica Minolta Inc
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05CAPPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/007Slide-hopper coaters, i.e. apparatus in which the liquid or other fluent material flows freely on an inclined surface before contacting the work
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05CAPPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C9/00Apparatus 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
    • B05C9/06Apparatus 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 two different liquids or other fluent materials, or the same liquid or other fluent material twice, to the same side of the work

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  • Application Of Or Painting With Fluid Materials (AREA)

Description

【0001】
【産業上の利用分野】
本発明はフィルムや印画紙の感光材料等の長尺支持体に感光乳剤等の塗布液を塗布する塗布方法に関する。
【0002】
【従来の技術】
現在、カラーフィルムやカラー印画紙等の製造にあたっては、支持体上に塗布液を多層塗布する技術が進み、その目的・機能に応じて多数の層が必要となり、塗布層数も増加の傾向にある。そして、層数が増加すれば、当然全層の厚さも増加するため、乾燥工程における負荷が増大する。具体的には、乾燥に要する時間の増大、乾燥風の温度増加・風量増大などを招き、生産速度・生産コストに重大な影響を与えてしまう。このため、多層塗布であっても全層の厚さを薄くするため、薄膜塗布に関する技術が必要とされている。
【0003】
また、生産性向上のために、支持体の搬送速度、すなわち塗布速度も益々増加の傾向にある。
【0004】
すなわち、塗布層の薄膜化および塗布速度の高速化が望まれている状況であるが、当然ながら、このような状況下にあっても塗布ムラ・筋発生・ハジキ等の塗布故障を起こすことなく均一に塗布されることが要望されている。
【0005】
そこで、支持体上に乳剤等の塗布液を一様かつ均一に塗布するために、塗布液の塗布を行なう前に、支持体に対して何らかの処理を行なうことが検討されており、その例として、現在までに次の(1)〜(4)に示すような技術が提案されている。
【0006】
(1)特開昭48−32923号は支持体に蒸気を付着させるものであり、特開昭52−31727号は支持体に水分を噴霧して吹き付けるようにしたものであり、いずれも支持体上に蒸気又は液体を付着させて、支持体の「濡れ性」を向上させることにより、塗布液が付き易くさせたものである。
【0007】
(2)特公平6−27928号は支持体を加熱することにより、塗布液が支持体に均一に付着させ易くしたものである。
【0008】
(3)特開昭57−167750号は支持体表面を帯電させることにより、塗布液の液付き(塗布性)を向上させたものである。
【0009】
(4)特開平5−66516号は温度20〜30℃で関係湿度が70〜90%である高湿度の風を支持体上に吹き付けることにより、塗布液の液付き(塗布性)を向上させようとしたものである。
【0010】
【発明が解決しようとする課題】
しかし、上述の各技術では、以下に示すようなハジキやムラ等の塗布故障が発生し易いため、「高速薄膜塗布」という条件を満たすことができず、品質的に充分な対応ができていないのが現状である。
【0011】
即ち、(1)項の技術では、結露により生じる液滴、または蒸気により直接生じる液滴が支持体に付着して、これによるハジキやムラ等の塗布故障が発生する。
【0012】
また、(2)項の技術では、支持体が高温になることにより、セット性が悪くなるので、塗布ムラが発生する。また、支持体周囲が支持体自身よりも低湿になるため、静電気が発生し易くなり、これに起因する筋故障が起こることがある。
【0013】
更に、(3)項の技術では、搬送される支持体の幅手方向に均一に帯電させることが困難であるため、帯電ムラによる塗布ムラやハジキ等の塗布故障を発生することがある。
【0014】
そして(4)項の技術では、処理に用いる風の露点より温度の低い支持体には、この風が結露して液滴が発生し、激しいハジキ現象が生じ、支持体に対して全く塗布が行なえないことがある。また、塗布装置自体にも結露することがあり、この結果筋故障が発生する。さらには装置に対する結露は、塗布装置を痛める原因となる。
【0015】
本発明はこのような従来技術の欠点を排除することを課題とし、高速薄膜塗布においてもハジキやムラ等の塗布故障を発生することなく、均一な塗布が可能な塗布方法を提供することを第1の目的とし、装置に対する結露を生ずることなく、装置・工程においてもメンテナンス性の優れた塗布装置を提供することを第2の目的とする。さらに、コストが低く、比較的簡単な構成でかかる目的を達成することを第3の目的とする。
【0016】
【課題を解決するための手段】
この目的は、連続搬送される長尺支持体上に塗布液を塗布する塗布方法であって、前記長尺支持体は、塗布が行なわれる面に対し、ゼラチンを含んだ下引層が形成されており、塗布位置近傍の搬送方向上流側の位置において、該長尺支持体の温度が10℃近傍に保持され、該長尺支持体の摂氏温度以下で、且つ該長尺支持体の摂氏温度の20%の摂氏温度以上の範囲にある露点を有する風を、前記長尺支持体上に吹き付けた後に、塗布を行うことを特徴とする塗布方法によって解決される。
【0017】
【実施例】
本発明の塗布方法をその作用も含めて図1に示す塗布装置の概略図を用いて説明する。しかし、本発明はこの実施様態に限定されるものではない。特に、塗布装置はスライドビード塗布装置に限らず、エクストルーダー、カーテンコーター、グラビアローラー等にも容易に適用可能である。
【0018】
連続走行する長尺の支持体1はバックアップローラ2に巻回されて矢示方向に搬送される。該バックアップローラ2には前記支持体1を介して、スライドビードコータ3が配設され、該スライドビードコータ3の下方と前記バックアップローラ2の間には減圧室11が設けられていて、サクションブロワー13によって所定の減圧度になるように減圧がなされている。そしてスライドビードコータ3の先端にスライド面を流下する塗布液がビード7をつくり、支持体1上に塗膜9が形成されて行く。
【0019】
また、前記バックアップローラ2の上流側には支持体1から所定の距離dだけ離れた下方の位置に処理風の吹出チャンバー26が設けられている。そして該チャンバー26には、温湿度調節器20からの温湿度調節風が入り、前記支持体1の表面に吹き付けられるようにしてある。前記温湿度調節器20には送風機22からの送風路と水蒸気源からの水蒸気の流入路23と調節用の排風路24及び調節弁が設けられ、加熱器及び冷却器が内蔵されている。これによって、連続走行してくる支持体1の摂氏温度以下で、且つ、その支持体1の摂氏温度の20%の摂氏温度以上の範囲にある露点を持つ処理風を支持体1上に吹き付けることができ、このような処理を塗布位置近傍の上流側で行わせることにより、支持体に対し、加湿することができる。この結果、高速薄膜の塗布が均一にムラなく行うことができる。特に、ゼラチン下引きの支持体に対して塗布を行なう場合は、加湿することにより支持体表面の「濡れ性」が向上し、塗布性が大幅に向上するので、本願発明の塗布方法を用いることは非常に好ましい。また、今までの処理風の露点が支持体温度より高くなることにより支持体への結露が起こることに起因したハジキやムラの塗布故障はなくなり、処理風の露点が支持体温度より低くなりすぎることにより支持体上への帯電が起こり、その帯電のムラに起因していた塗布ムラも一切なく、上述のような簡易的な構成で、塗布性能を大幅に向上させることができる。また、塗布装置にかかわる構成も大幅に増大しないので、製造設備に関するコストの上昇も最小限に抑えることができる。また、結露が生じることがない為、これに起因する塗布故障(特に筋故障)は全く生じない。さらに塗布装置に対しても結露しないので、装置の痛み・汚れが最小限にとどまり、メンテナンス性がよく、装置の寿命も長くなり、長期的に見てもコストが低減する。
【0020】
次にこの塗布方法の具体例を次の実施例1に示す。
【0021】
実施例1
ゼラチンを含む下引層を有するPETフィルムの支持体1上に前記スライドビードコータ3にて下記に示す各条件によって2層の塗布を行った。
【0022】
上層:5%ゼラチン水溶液にアニオン系界面活性剤を0.5g/リットル添加したものであり、粘度は17cpである。
【0023】
下層:10%ゼラチン水溶液にハロゲン化銀を所定量混合したものであり、粘度は22cpである。
【0024】

Figure 0003814838
このような条件で塗布を行い、表1に示すような塗布結果を得た。
【0025】
【表1】
Figure 0003814838
【0026】
この結果、処理風の露点が支持体温度以下で、且つ、該支持体温度の20%以上の範囲であれば塗布欠陥の無い良好な一様塗布が行えるが、上記範囲外になると、ムラ或いは弱いハジキ状の塗布欠陥が発生し、処理風がないと更にハジキの発生が増えることが確認された。
【0027】
更に、処理風の露点を支持体温度より高くしないように本発明で制限することにより支持体上への結露がなくなり、結露に起因したハジキやムラ等の塗布故障を皆無にすることが可能になった。
【0028】
【発明の効果】
本発明により支持体、特に、ゼラチン下引層をもつ支持体に加湿することによって、結露することなく支持体表面の「濡れ性」を高めることにより、塗布故障を生じない高速薄膜塗布が可能になった。更に、支持体上への帯電に起因するムラも抑制できる。
【0029】
そして上述のような比較的簡易な構成で、装置にかかわる構成も大幅に増大させることなく、製造設備に関するコストも最小限に抑えることができる。さらにメンテナンス性がよく、工程装置の寿命も長くなり、長期的に見てもコストを低減させることができる。
【図面の簡単な説明】
【図1】本発明の塗布方法に用いた塗布装置の概略図。
【符号の説明】
1 支持体
2 バックアップローラ
3 スライドビードコータ
7 ビード
9 塗膜
11 減圧室
13 サクションブロワー
20 温湿度調節器
22 送風機
23 流入路
24 排風路
26 吹出チャンバー[0001]
[Industrial application fields]
The present invention relates to a coating method in which a coating solution such as a photosensitive emulsion is coated on a long support such as a photosensitive material for film and photographic paper.
[0002]
[Prior art]
Currently, in the production of color films, color photographic paper, etc., technology for applying coating liquids on the support has progressed, and many layers are required depending on the purpose and function, and the number of coating layers tends to increase. is there. And if the number of layers increases, naturally the thickness of all the layers also increases, so the load in the drying process increases. Specifically, an increase in time required for drying, an increase in temperature of the drying air, an increase in air volume, and the like are caused, and the production speed and production cost are seriously affected. For this reason, in order to reduce the thickness of all layers even in the case of multilayer coating, a technique relating to thin film coating is required.
[0003]
In addition, in order to improve productivity, the conveyance speed of the support, that is, the coating speed, tends to increase more and more.
[0004]
In other words, it is a situation where thinning of the coating layer and high coating speed are desired, but of course without causing coating failure such as coating unevenness, streaks, repellency etc. even under such circumstances There is a demand for uniform application.
[0005]
Therefore, in order to uniformly and uniformly apply a coating solution such as an emulsion on the support, it has been studied to perform some treatment on the support before applying the coating solution. So far, the following technologies (1) to (4) have been proposed.
[0006]
(1) Japanese Patent Application Laid-Open No. 48-32923 is for adhering vapor to a support, and Japanese Patent Application Laid-Open No. 52-31727 is for spraying and spraying water on the support. Vapor or liquid is deposited on the substrate to improve the “wetting property” of the support, thereby facilitating application of the coating liquid.
[0007]
(2) Japanese Patent Publication No. 6-27928 is one in which the support is heated so that the coating solution can be uniformly attached to the support.
[0008]
(3) Japanese Patent Application Laid-Open No. 57-167750 improves the adhesion (coating property) of the coating liquid by charging the surface of the support.
[0009]
(4) Japanese Patent Application Laid-Open No. 5-66516 improves the adhesion (application property) of the coating liquid by blowing high humidity wind having a temperature of 20 to 30 ° C. and a relative humidity of 70 to 90% on the support. It was something like that.
[0010]
[Problems to be solved by the invention]
However, in each of the above-described technologies, application failure such as repellency and unevenness as described below is likely to occur, so the condition of “high-speed thin film application” cannot be satisfied, and the quality cannot be adequately handled. is the current situation.
[0011]
That is, in the technique of item (1), droplets generated by condensation or droplets directly generated by vapor adhere to the support, resulting in coating failure such as repellency and unevenness.
[0012]
Moreover, in the technique of (2), since a support becomes high temperature and set property worsens, the coating nonuniformity generate | occur | produces. In addition, since the periphery of the support is less humid than the support itself, static electricity is likely to be generated, and a muscle failure may be caused due to this.
[0013]
Furthermore, in the technique of item (3), since it is difficult to uniformly charge the support to be conveyed in the width direction, application failure such as uneven application or repelling due to uneven charging may occur.
[0014]
In the technique of item (4), the wind is condensed on the support whose temperature is lower than the dew point of the wind used for the treatment, droplets are generated, and a severe repellency phenomenon occurs, so that the coating is completely applied to the support. There are things you can't do. Also, condensation may occur on the coating apparatus itself, resulting in muscle failure. Furthermore, condensation on the apparatus causes damage to the coating apparatus.
[0015]
An object of the present invention is to eliminate such drawbacks of the prior art, and to provide a coating method capable of uniform coating without causing coating failure such as repelling or unevenness even in high-speed thin film coating. A second object is to provide a coating apparatus having excellent maintainability even in the apparatus and process without causing condensation on the apparatus. Furthermore, a third object is to achieve this object with a relatively simple configuration at a low cost.
[0016]
[Means for Solving the Problems]
The purpose of this is a coating method in which a coating solution is applied onto a continuously supported long support, and the long support has an undercoat layer containing gelatin formed on the surface to be coated. and, at a position upstream side of the coating position near the lengths temperature of continuous support it is held in the vicinity of 10 ° C., the length in degrees Celsius following scale support, and degrees Celsius of the long support member It is solved by a coating method characterized in that coating is performed after a wind having a dew point in the range of 20% or more of the above is blown onto the long support.
[0017]
【Example】
The coating method of the present invention will be described using the schematic view of the coating apparatus shown in FIG. However, the present invention is not limited to this embodiment. In particular, the coating apparatus is not limited to a slide bead coating apparatus, but can be easily applied to an extruder, a curtain coater, a gravure roller, or the like.
[0018]
The long support 1 that travels continuously is wound around the backup roller 2 and conveyed in the direction of the arrow. The backup roller 2 is provided with a slide bead coater 3 via the support 1, and a decompression chamber 11 is provided between the backup bead coater 3 and the backup roller 2. 13, the pressure is reduced to a predetermined degree of pressure reduction. Then, the coating liquid flowing down the slide surface at the tip of the slide bead coater 3 creates a bead 7, and a coating film 9 is formed on the support 1.
[0019]
Further, on the upstream side of the backup roller 2, a processing air blowing chamber 26 is provided at a lower position away from the support 1 by a predetermined distance d. The chamber 26 is supplied with temperature / humidity adjusting air from the temperature / humidity controller 20 and blown onto the surface of the support 1. The temperature / humidity adjuster 20 is provided with a blower path from the blower 22, a steam inflow path 23 from a steam source, a regulation exhaust air path 24, and a regulating valve, and a heater and a cooler are incorporated therein. Thus, in the following degrees Celsius of the support 1 comes to continuously running, and, by blowing process air with dew point in the range of 20% or more degrees Celsius degrees Celsius of the support 1 on the support 1 By performing such treatment on the upstream side in the vicinity of the application position, the support can be humidified. As a result, the high-speed thin film can be uniformly applied without unevenness. In particular, when coating is applied to a gelatin subbing support, the “wetting” of the support surface is improved by humidification, and the coating property is greatly improved. Is highly preferred. In addition, since the dew point of the treatment wind up to now is higher than the support temperature, there is no application failure of repelling or unevenness due to condensation on the support, and the dew point of the treatment wind becomes too lower than the support temperature. As a result, charging on the support occurs, and there is no coating unevenness due to the uneven charging, and the coating performance can be greatly improved with the simple configuration as described above. In addition, since the configuration related to the coating apparatus does not increase significantly, an increase in cost related to the manufacturing equipment can be minimized. In addition, since no condensation occurs, there is no application failure (particularly muscle failure) due to this. Further, since no dew condensation occurs on the coating apparatus, the pain and dirt of the apparatus are minimized, the maintainability is good, the life of the apparatus is extended, and the cost is reduced in the long run.
[0020]
Next, a specific example of this coating method is shown in the following Example 1.
[0021]
Example 1
On the PET film support 1 having a subbing layer containing gelatin, two layers were applied by the slide bead coater 3 under the following conditions.
[0022]
Upper layer: 0.5% / liter of anionic surfactant added to 5% gelatin aqueous solution, viscosity is 17 cp.
[0023]
Lower layer: A predetermined amount of silver halide mixed in a 10% gelatin aqueous solution, and the viscosity is 22 cp.
[0024]
Figure 0003814838
Coating was performed under such conditions, and coating results as shown in Table 1 were obtained.
[0025]
[Table 1]
Figure 0003814838
[0026]
As a result, if the dew point of the treatment wind is equal to or lower than the support temperature and 20% or more of the support temperature, good uniform application without application defects can be performed. It was confirmed that a weak repellency-like coating defect occurred and the occurrence of repellency further increased without the treatment wind.
[0027]
Furthermore, by limiting the dew point of the treatment wind so as not to be higher than the support temperature, condensation on the support is eliminated and it is possible to eliminate coating failures such as repellency and unevenness due to condensation. became.
[0028]
【The invention's effect】
The present invention enables high-speed thin film coating without causing coating failure by increasing the “wetting” of the surface of the support without condensation by humidifying the support, particularly a support having a gelatin subbing layer. became. Furthermore, unevenness due to charging on the support can also be suppressed.
[0029]
In addition, with a relatively simple configuration as described above, the cost associated with the manufacturing facility can be minimized without significantly increasing the configuration related to the apparatus. Furthermore, maintainability is good, the life of the process equipment is extended, and the cost can be reduced over the long term.
[Brief description of the drawings]
FIG. 1 is a schematic view of a coating apparatus used in a coating method of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Support body 2 Backup roller 3 Slide bead coater 7 Bead 9 Coating film 11 Decompression chamber 13 Suction blower 20 Temperature / humidity controller 22 Blower 23 Inflow path 24 Exhaust path 26 Blowing chamber

Claims (1)

連続搬送される長尺支持体上に塗布液を塗布する塗布方法であって、
前記長尺支持体は、塗布が行なわれる面に対し、ゼラチンを含んだ下引層が形成されており、
塗布位置近傍の搬送方向上流側の位置において、該長尺支持体の温度が10℃近傍に保持され、該長尺支持体の摂氏温度以下で、且つ該長尺支持体の摂氏温度の20%の摂氏温度以上の範囲にある露点を有する風を、前記長尺支持体上に吹き付けた後に、
塗布を行うことを特徴とする塗布方法。
A coating method for coating a coating solution on a continuously supported long support,
The long support has an undercoat layer containing gelatin formed on the surface to be coated,
At a position upstream side of the coating position near the temperature of the long support body is held in the vicinity of 10 ° C., with the following degrees Celsius of the long support member, and 20% of degrees Celsius of the long support member After blowing a wind having a dew point in the range above the Celsius temperature on the long support,
A coating method characterized by performing coating.
JP16392595A 1995-06-29 1995-06-29 Application method Expired - Fee Related JP3814838B2 (en)

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JP16392595A JP3814838B2 (en) 1995-06-29 1995-06-29 Application method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16392595A JP3814838B2 (en) 1995-06-29 1995-06-29 Application method

Publications (2)

Publication Number Publication Date
JPH0910669A JPH0910669A (en) 1997-01-14
JP3814838B2 true JP3814838B2 (en) 2006-08-30

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Family Applications (1)

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JPH0910669A (en) 1997-01-14

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