JP3953035B2 - Curtain film forming method - Google Patents
Curtain film forming method Download PDFInfo
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- JP3953035B2 JP3953035B2 JP2004030479A JP2004030479A JP3953035B2 JP 3953035 B2 JP3953035 B2 JP 3953035B2 JP 2004030479 A JP2004030479 A JP 2004030479A JP 2004030479 A JP2004030479 A JP 2004030479A JP 3953035 B2 JP3953035 B2 JP 3953035B2
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Description
本発明はカーテン塗布装置を用いて安定したカーテン膜を提供するカーテン膜形成方法に関する。 The present invention relates to a curtain film forming method for providing a stable curtain film using a curtain coating apparatus.
コータダイスのスライド面上を均一な層を形成して流下する塗布液を前記コータダイスのダイスリップ先端部位置から落下させて塗布液の薄いカーテン膜を形成させ該カーテン膜を一定の高速度で搬送されてくる長尺の支持体ウエブ上に載せながら連続的に塗布を行うカーテン塗布装置を用いて感光材料を製造する方法が従来より知られている。このようなカーテン塗布装置を用いて感光材料を製造する方法において、カーテン膜を安定して形成させることは、非常に重要なことである。スライド面を流下した塗布液がダイスリップを離れて、カーテン膜を形成するとき、表面張力により縮まろうとする塗布液をエッジガイドと呼ばれるサイド部の棒(もしくは板)で保持させて塗布液の流下幅を確保している。 The coating liquid that flows down in a uniform layer on the sliding surface of the coater die is dropped from the tip position of the die slip of the coater die to form a thin curtain film of the coating liquid, and the curtain film is conveyed at a constant high speed. 2. Description of the Related Art Conventionally, a method for producing a photosensitive material using a curtain coating apparatus that performs coating continuously while being placed on a long support web is known. In a method for producing a photosensitive material using such a curtain coating apparatus, it is very important to stably form a curtain film. When the coating solution that has flowed down the slide surface leaves the die slip and forms a curtain film, the coating solution that tends to shrink due to surface tension is held by a side bar (or plate) called an edge guide, and the coating solution flows down. The width is secured.
しかしながら、縮まろうとする塗布液の力をエッジガイドが支えられなかったときは膜破壊が生じ、安定なカーテン膜形成が困難となる。これまでの技術ではカーテン膜が形成できず壊れたり、たとえカーテン膜が形成できたとしても塗布開始と同時にエッジガイドのカーテン膜保持力不足のために、塗布液が支持体の搬送方向に引っ張られる力によって、端部のカーテン膜が破壊される現象が生じることがしばしあった。これらの現象を無くすために、これまで種々の提案がなされている。 However, when the edge guide cannot support the force of the coating solution to be shrunk, the film breaks down, making it difficult to form a stable curtain film. Even if the curtain film can not be formed with the conventional technology, or the curtain film can be formed, the coating liquid is pulled in the transport direction of the support due to the lack of the curtain film holding force of the edge guide at the start of application. For some time, the phenomenon that the curtain film at the end portion is broken due to the force has occurred. In order to eliminate these phenomena, various proposals have been made so far.
即ち、特開平1−99668号公報では、これを改善し膜が破壊しないようにするために両側の端部に別にサイド液を流しカーテン膜を補強安定化させる手段等が取られている。しかしカーテン膜は破壊しなくなっても端部に該サイド液が集中堆積するため両側サイドの膜厚が厚くなり過ぎたりする。 That is, in Japanese Patent Application Laid-Open No. 1-99668, in order to improve this and prevent the film from being broken, a means for reinforcing and stabilizing the curtain film by flowing a side liquid separately at both ends is taken. However, even if the curtain film does not break down, the side liquid concentrates and accumulates at the end portion, so that the film thickness on both sides becomes too thick.
この両側サイドの膜厚増大を抑えるために、特開昭61−477号公報、特開平6−233954号公報で開示しているように、エッジガイド部のカーテン膜端部厚膜部を吸引で除去したりしている。 In order to suppress the increase in the film thickness on both sides, as shown in Japanese Patent Application Laid-Open No. 61-477 and Japanese Patent Application Laid-Open No. Hei 6-233594, the curtain film end thick film portion of the edge guide portion is sucked. It has been removed.
また、特開昭51−57734号公報では、平板型エッジガイドの使用によりカーテン膜安定化が行なわれている。しかしこれでもカーテン膜は安定化せず、塗布液によってはカーテン膜形成が不可となっている。また、両端厚膜現象も解消されない。 In JP-A-51-57734, the curtain film is stabilized by using a flat plate edge guide. However, even this does not stabilize the curtain film, and it is impossible to form the curtain film depending on the coating solution. Also, the thick film phenomenon at both ends is not eliminated.
このように、今までカーテン膜形成のために種々の塗布装置が提案されてきているが満足なものはまだ得られていない。
本発明では、新たな設備付加や装置の変更を行わず、各塗布液の動的表面張力の関係を追求し、カーテン膜の形成をより安定化させ、安定な塗布による感光材料製造を行なうことができる方法を見出すことを課題目的にする。
As described above, various coating apparatuses have been proposed for forming a curtain film, but satisfactory ones have not been obtained yet.
In the present invention, without adding new equipment or changing the apparatus, the relationship between the dynamic surface tensions of the respective coating liquids is pursued, the formation of the curtain film is further stabilized, and the photosensitive material is manufactured by stable coating. The objective is to find a method that can do this.
この目的は次の技術手段(1)又は(2)によって達成される。
(1) カーテン塗布装置を用いて、連続する支持体に3層以上でかつ総流量2.0cc/sec/cm以上の塗布液を同時に塗布するカーテン膜の形成方法において、前記3層以上の層のうち、中間の層の動的表面張力(DST)の最小値σ中min[mN/m]と、前記3層以上の層のうち、外側の層(最上層及び最下層)のDST最大値σ外max[mN/m]の差ΔKが、
ΔK=σ中min−σ外max≧5 [mN/m]
であるような動的表面張力構成の塗布液を用いて塗布を行うことを特徴とするカーテン膜形成方法。
(2) 塗布速度が3m/sec以上であることを特徴とする請求項1項に記載のカーテン膜形成方法。
(3)塗布速度が5m/sec以上であることを特徴とする請求項1または2項に記載のカーテン膜形成方法。
This object is achieved by the following technical means (1) or (2).
(1) Using a curtain coating apparatus, the continuous support has 3 layers or more and a total flow rate of 2 . In the method for forming a curtain film in which a coating solution of 0 cc / sec / cm or more is applied simultaneously, among the three or more layers, the minimum value σ of the dynamic surface tension (DST) of an intermediate layer min [mN / m ] And the difference ΔK between the DST maximum values σ out of the layers (the uppermost layer and the lowermost layer) out of the three or more layers, max [mN / m],
ΔK = min in σ−max outside σ ≧ 5 [mN / m]
A curtain film forming method, wherein coating is performed using a coating liquid having a dynamic surface tension configuration as described above.
(2) the curtain film forming method according to claim 1, wherein the coating speed is equal to or is 3m / sec or more.
(3) The curtain film forming method according to claim 1 or 2, wherein the coating speed is 5 m / sec or more.
即ち、本発明者等の検討の結果、特に層数が3層構成以上となる複雑な系では塗布液の動的表面張力(DST)構成がカーテン膜の安定性に大きく依存していることが判明した。更なる検討で中間層のDSTとカーテン膜の外側の層(最上層と最下層)のDSTの関係が大きく依存していることが判明した。3,5,7,9,16層系でそれぞれ検討した結果、いずれもΔK[mN/m]を大きくすれば、カーテン膜安定性や塗布性がより良好になることが判明した。 That is, as a result of the study by the present inventors, the dynamic surface tension (DST) configuration of the coating liquid is highly dependent on the stability of the curtain film, particularly in a complicated system having three or more layers. found. Further investigation revealed that the relationship between the DST of the intermediate layer and the DST of the outer layer (the uppermost layer and the lowermost layer) of the curtain film greatly depends. As a result of examining each of the 3, 5, 7, 9, and 16 layer systems, it has been found that if ΔK [mN / m] is increased, the curtain film stability and applicability are improved.
先ず、本発明の感光材料の製造方法に用いた塗布装置を図1の斜視図を用いて説明する。バックローラ1に長尺の支持体2が巻回されて等速度で矢印方向に搬送可能にしてある。該バックローラ1の外方の斜め上方にコータダイス3が設けられていて、該コータダイス3のスライド面4を均一な層厚を形成しながら複数層の塗布液が流下し、該コータダイス3のダイスリップ5の先端部の位置で離れて、薄いカーテン膜を形成しながら落下して行く。其の際、該カーテン膜の両サイドはエッジガイド6との間に生ずる動的表面張力(DST)により均一な膜を形成保持されながら前記等速度で搬送中の支持体2上に載せられて連続的な塗布が達成されて行く。
First, a coating apparatus used in the method for producing a photosensitive material of the present invention will be described with reference to the perspective view of FIG. A long support 2 is wound around the back roller 1 so that it can be conveyed in the arrow direction at a constant speed. A
そしてエッジガイド6は図1に示すように真直な棒状の物を鉛直に設置した物である。上記棒状のエッジガイドはステンレス製の丸棒又は角柱である。
本発明の実施例の実験ではでは同時に重層塗布される塗布層の数は3,5,7,9,16に亙っているが、本発明は此れらの数に限定されるものではない。
以下、本発明の実施例の結果について詳述する。
And the
In the experiment of the embodiment of the present invention, the number of coating layers simultaneously applied in multiple layers is 3, 5, 7, 9, 16; however, the present invention is not limited to these numbers. .
Hereinafter, the result of the Example of this invention is explained in full detail.
実施例1
実験の基本条件
各塗布液の組成 ゼラチン7%の塗布液,増粘剤にて30cpに調整
総流量 1,2,3,4cc/sec/cm
層構成 3,5,7,9,16層
カーテン高さ 30〜300mm
塗布速度 180,300,420m/min(3,5,7m/sec)でカーテン膜耐久測定
カーテン膜幅 300mm
エッジガイド ステンレス製丸棒型及び角柱型で実施
評価の記号 ○:塗布可
△:塗布開始後カーテン膜切れ
×:カーテン膜切れ
塗布可の内 ○3:塗布速度3m/secまで塗布可能
○5:塗布速度5m/secまで塗布可能
○7:塗布速度7m/secまで塗布可能
尚、各液のDST測定は図2の模式図に示すようなカーテン膜破壊法を用いた。また、カーテン膜安定性、及び塗布安定性を評価する方法として、各系での塗布可能な塗布速度(m/sec)を比較した。
以上に基づき、層構成が3層、5層、7層、9層及び16層の各場合において、DSKのΔK値、総流量のQ値、エッジガイドの寸法形状を変化させて塗布膜形成、即ち塗布状態の安定性を検証した本発明の実施の結果を次の表1〜5に記す。
Example 1
Basic conditions of the experiment Composition of each coating solution Gelatin 7% coating solution, adjusted to 30 cp with thickener
Curtain film durability measurement at coating speed 180, 300, 420 m / min (3, 5, 7 m / sec) Curtain film width 300 mm
Edge guide Symbol for evaluation of stainless steel round bar type and prismatic type ○: Applicable
△: Curtain film cut after application starts
×: Of curtain film can be applied ○ 3: Can be applied up to 3m / sec.
○ 5: Applicable up to 5m / sec.
○ 7: Coating is possible up to a coating speed of 7 m / sec. The DST measurement of each solution used a curtain film destruction method as shown in the schematic diagram of FIG. Further, as a method for evaluating curtain film stability and coating stability, coating speeds (m / sec) that can be coated in each system were compared.
Based on the above, in each case of 3 layers, 5 layers, 7 layers, 9 layers, and 16 layers, the coating film is formed by changing the ΔK value of DSK, the Q value of the total flow rate, and the dimensional shape of the edge guide. That is, the results of implementation of the present invention that verified the stability of the coating state are shown in the following Tables 1 to 5.
以上により、ΔK値は好ましくは、ΔK≧5[mN/m]であり、より好ましくは、ΔK≧10[mN/m]であることが分かる。
本発明により、新たな設備付加や装置の変更を行わず、各塗布液の動的表面張力の関係を規定することにより、カーテン膜の形成をより安定化させ、安定な塗布による感光材料製造を行なうことができる方法が確立できた。
From the above, it can be seen that the ΔK value is preferably ΔK ≧ 5 [mN / m], and more preferably ΔK ≧ 10 [mN / m].
By defining the relationship between the dynamic surface tension of each coating liquid without adding new equipment or changing the equipment, the present invention makes it possible to further stabilize the formation of the curtain film and to produce a photosensitive material by stable coating. We have established a method that can be performed.
1 バックローラ
2 支持体
3 コータダイス
4 スライド面
5 ダイスリップ
6 エッジガイド
7 カーテン膜
DESCRIPTION OF SYMBOLS 1 Back roller 2
Claims (3)
ΔK=σ中min−σ外max≧5 [mN/m]
であるような動的表面張力構成の塗布液を用いて塗布を行うことを特徴とするカーテン膜形成方法。 Using a curtain coating device, a continuous support with three or more layers and a total flow of 2 . In the method for forming a curtain film in which a coating solution of 0 cc / sec / cm or more is applied simultaneously, among the three or more layers, the minimum value σ of the dynamic surface tension (DST) of an intermediate layer min [mN / m ] And the difference ΔK between the DST maximum values σ out of the layers (the uppermost layer and the lowermost layer) out of the three or more layers, max [mN / m],
ΔK = min in σ−max outside σ ≧ 5 [mN / m]
A curtain film forming method, wherein coating is performed using a coating liquid having a dynamic surface tension configuration as described above.
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JP2004030479A JP3953035B2 (en) | 2004-02-06 | 2004-02-06 | Curtain film forming method |
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JP2004030479A JP3953035B2 (en) | 2004-02-06 | 2004-02-06 | Curtain film forming method |
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JP06441896A Division JP3543245B2 (en) | 1996-03-21 | 1996-03-21 | Photosensitive material manufacturing method |
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JP2004181459A JP2004181459A (en) | 2004-07-02 |
JP3953035B2 true JP3953035B2 (en) | 2007-08-01 |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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US8753721B2 (en) | 2009-03-18 | 2014-06-17 | Ricoh Company, Ltd. | Method and apparatus for producing thermosensitive recording material |
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Publication number | Priority date | Publication date | Assignee | Title |
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JP2009226241A (en) * | 2008-03-19 | 2009-10-08 | Konica Minolta Holdings Inc | Method for simultaneously coating many layers |
JP2016203400A (en) * | 2015-04-16 | 2016-12-08 | 大阪シーリング印刷株式会社 | Thermosensitive recording body manufacturing method, thermosensitive recording body manufacturing apparatus and thermosensitive recording body |
EP3943661A1 (en) * | 2020-07-20 | 2022-01-26 | Schoeller Technocell GmbH & Co. KG | Packaging material with a barrier layer |
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Cited By (1)
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US8753721B2 (en) | 2009-03-18 | 2014-06-17 | Ricoh Company, Ltd. | Method and apparatus for producing thermosensitive recording material |
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