JP2916540B2 - Coating method - Google Patents
Coating methodInfo
- Publication number
- JP2916540B2 JP2916540B2 JP25886689A JP25886689A JP2916540B2 JP 2916540 B2 JP2916540 B2 JP 2916540B2 JP 25886689 A JP25886689 A JP 25886689A JP 25886689 A JP25886689 A JP 25886689A JP 2916540 B2 JP2916540 B2 JP 2916540B2
- Authority
- JP
- Japan
- Prior art keywords
- coating
- slot
- liquid
- coating method
- flow rate
- 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.)
- Expired - Fee Related
Links
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明はカーテン塗布方法、特にエクストルージョン
型注液器よりの低粘度かつ低流量の塗布液のカーテン塗
布方法に関する。Description: FIELD OF THE INVENTION The present invention relates to a curtain coating method, and more particularly to a curtain coating method of a coating solution having a low viscosity and a low flow rate from an extrusion type liquid injector.
〔従来の技術〕 従来、エクストルージョン型注液器によるカーテン塗
布方法としては、特開昭48−34946号，特開昭52−69946
号各公報がある。[Prior Art] Conventionally, as a curtain coating method using an extrusion type liquid injector, JP-A-48-34946 and JP-A-52-69946 are known.
There is a gazette for each issue.
しかしながら、特開昭48−34946号公報の塗布装置で
は、注液器の説明に第１図を借用して説明すると、低粘
度，低流量の塗布を行う場合、スロット5,6より液だま
り（キャビティ）４が上位に存在するため、スロットの
クリアランスDa,Dbが広い場合や、液の粘度が低い場合
にはキャビティ内部に十分液が満されていない状態でス
ロット5,6から塗布液1,2が流下してしまい、キャビティ
４内に空間が生じる。However, in the coating apparatus disclosed in Japanese Patent Application Laid-Open No. 48-34946, the liquid injector is described with reference to FIG. 1. When coating with low viscosity and low flow rate, the liquid pools from the slots 5 and 6 ( When the clearances D a and D b of the slots are wide or the viscosity of the liquid is low because the cavity 4 is present at the top, the coating liquid from the slots 5 and 6 is not sufficiently filled in the cavity. 1 and 2 flow down, and a space is created in the cavity 4.
写真感光材料のような均質物を必要とする塗布面質に
対してはスジ・ムラ等の塗布故障を生じる。Coating failures such as streaks and unevenness occur on coated surfaces requiring homogeneous materials such as photographic light-sensitive materials.
その為エクストルージョン型注液器は使われにくく、
一般にはスライドホッパー型（例えば特公昭49−24133
号公報）注液器による塗布装置が写真感光剤の塗布用に
多く使用されている。Therefore, extrusion type liquid injectors are hard to use,
Generally, a slide hopper type (for example, JP-B-49-24133)
Japanese Patent Application Publication No. JP-A-2003-115122, a coating apparatus using a liquid injector is widely used for applying a photographic photosensitive agent.
特開昭52−69946号公報には二重スロット、キャビテ
ィによる対策例が出ているが、構造上難点が多い。Japanese Patent Application Laid-Open No. 52-69946 discloses a countermeasure example using a double slot and a cavity, but there are many structural difficulties.
又スライドホッパー型・注液器によるカーテン塗布方
法は多層重層塗布用には適しているが、塗布装置全体が
大きくなる点から、一方単層ないし数層の塗布にはエク
ストルージョン型注液器の方がコンパクトで良い。The curtain coating method using a slide hopper type / liquid injection device is suitable for multi-layer, multi-layer coating. It is better to be more compact.
本発明は上記問題点に鑑み、低流量、低粘度の塗布液
をエクストルージョン型注液器で塗布出来る塗布方法を
提供することにある。SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides a coating method capable of applying a low flow rate, low viscosity coating liquid by an extrusion type liquid injector.
本発明の上記目的は、 （１） スロットより液だまり部が上位に存在するエク
ストルージョン型注液器よりウエブ上に自由落下塗布液
膜により塗布を行う方法において、該自由落下塗布液膜
の流下量が0.5cc/cm・sec以下の流量で、20cps以下の粘
度の塗布液を、前記スロットの塗布液抵抗を大きくして
塗布を行うことを特徴とする塗布方法。The object of the present invention is: (1) In a method of applying a free-falling coating liquid film onto a web from an extrusion type liquid injector in which a liquid pool portion exists above a slot, the free-falling coating liquid film flows down. A coating method, wherein a coating liquid having a flow rate of 0.5 cc / cm · sec or less and a viscosity of 20 cps or less is applied by increasing the coating liquid resistance of the slot.
（２） 該スロットのクリアランスが0.5mm以下にであ
ることを特徴とする請求項（１）記載の塗布方法。(2) The coating method according to (1), wherein the clearance of the slot is 0.5 mm or less.
によって達成される。Achieved by
本発明のスロットのクリアランスの塗布液抵抗を大き
くするということは、スロットのクリアランスを狭める
か、長さを長くすることによって行われる。また塗布液
の粘度を制限一杯に上げることによっても出来る。To increase the coating liquid resistance of the clearance of the slot according to the present invention is performed by reducing the clearance of the slot or increasing the length. It can also be achieved by increasing the viscosity of the coating solution to the limit.
本発明を図を用いて説明する。第１図は本発明の塗布
方法を用いたエクストルージョン装置の横断面図であ
る。The present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of an extrusion apparatus using the coating method of the present invention.
第１図においてスロットのクリアランスを0.5mm以下
にすることということは前述のエクストルージョン型注
液器３の欠点であるキャビティ部４での塗布液1,2の落
下を防止するために、それぞれのスロット部5,6での塗
布液1,2の抵抗をあげるためである。それぞれのスロッ
ト5,6のクリアランスDa,Dbは自由落下塗布液膜の流下量
及び粘度にもよるが、0.5mm以下、好ましくは0.3mm以下
が望ましい。In FIG. 1, reducing the clearance of the slot to 0.5 mm or less means that the coating liquids 1 and 2 are prevented from dropping in the cavity 4 which is a drawback of the aforementioned extrusion type liquid injector 3. This is to increase the resistance of the coating solutions 1 and 2 in the slot portions 5 and 6. The clearances D a and D b of the respective slots 5 and 6 are preferably 0.5 mm or less, preferably 0.3 mm or less, depending on the amount and viscosity of the free-falling coating liquid film.
又第２図のようにスロットのクリアランスDa,Dbと共
にスロット長laをlbのように長くすることも上記効果を
さらに助けることになる。スロット長は50mm以上がよい
が、装置の大きさからの制約もありおのずと制限され
る。In addition, as shown in FIG. 2, increasing the slot length la such as lb together with the slot clearances D a and D b further helps the above effect. The slot length is preferably 50 mm or more, but it is naturally limited due to the size of the device.
７はウエブである。 7 is a web.
比較例−１ 第１図に示すようなエクストルージョン型注液器によ
るカーテン塗布方法としてスロットクリアランス0.8mm
のエクストルージョン型塗布装置を用いて、ハレーショ
ン防止用染料の入った液と保護層を塗布する場合、乾燥
負荷より保護層は出来る限り薄く塗布しようとしたが、
100m/minの塗布速度で塗布するためには保護層60cc/m2
（自由落下塗布液膜流下量1cc/cm・sec）にしないと満
足な塗布が出来なかった。塗布液の粘度は40℃で染料の
入った液は45cps,保護層は10cpsであった。Comparative Example-1 A slot clearance of 0.8 mm was used as a curtain coating method using an extrusion type liquid injector as shown in FIG.
When applying the solution containing the antihalation dye and the protective layer using the extrusion type coating apparatus, the protective layer was applied as thinly as possible due to the drying load.
To apply at a coating speed of 100 m / min, a protective layer of 60 cc / m 2
Satisfactory coating could not be achieved unless the flow rate of the free-falling coating liquid film was 1 cc / cm · sec. The viscosity of the coating solution was 40 ° C., the solution containing the dye was 45 cps, and the protective layer was 10 cps.
実施例−１ 比較例−１と同型の塗布装置を用い、但し、保護層側
のスロットのクリアランスをDb＝0.3mmにして、後は全
く比較例−１と同条件で塗布したところ、保護層の塗布
量6cc/m2（自由落下塗布液膜流下量0.1cc/cm・sec）で
十分に膜が形成され塗布が出来た。Using the coating apparatus of Example -1 Comparative Example 1 and the same type, except that the clearance of the protective layer side of the slots in the D b = 0.3 mm, was applied in exactly the same conditions as in Comparative Example 1 after the protective At a coating amount of the layer of 6 cc / m 2 (flow rate of the free-falling coating liquid film: 0.1 cc / cm · sec), a sufficient film was formed and coating was completed.
実施例−２ 実施例−１の塗布装置を用い、保護層のみの粘度を20
cpsに増粘剤で増やし、塗布をしたところ、更に塗布量
を4.2cc/m2（自由落下塗布液流下量0.07cc/cm・sec）の
塗布が可能になった。Example 2 Using the coating apparatus of Example 1, the viscosity of only the protective layer was adjusted to 20.
By increasing the cps with a thickener and applying the coating, it became possible to apply a coating amount of 4.2 cc / m 2 (flow rate of the free-falling coating solution: 0.07 cc / cm · sec).
上記の結果を第１表で比較する。 The above results are compared in Table 1.
実施例−３ 塗布液が保護層でなく、金属酸化物をバインダー及び
溶媒に分散した塗布液を粘度10cpsに調整し、該塗布液
を下層にして実施例−１と同様のエクストルージョン型
注液器により塗布を行ったところ200m/minの塗布速度で
塗布量6cc/m2（自然落下塗布液膜流下量0.2cc/cm・se
c）で塗布が可能であった。 Example 3 A coating solution in which a coating solution was not a protective layer but a metal oxide was dispersed in a binder and a solvent was adjusted to a viscosity of 10 cps, and the same coating solution was used as a lower layer in the same extrusion type injection as in Example-1. When the coating was performed using a dispenser, the coating amount was 6 cc / m 2 at a coating speed of 200 m / min (the flow rate of the naturally falling coating liquid film was 0.2 cc / cm · se
Application was possible in c).
本発明の塗布方法により、低流量、低粘度の塗布液の
場合もエクストルージョン型注液器によるカーテン塗布
方法が実施出来るようになり、より一層の薄層塗布が可
能になったので、品質改善の効果、及び更に高速塗布が
可能になったことによる生産効率の増大の効果が大であ
る。According to the coating method of the present invention, even in the case of a coating liquid having a low flow rate and a low viscosity, a curtain coating method using an extrusion-type liquid injector can be performed, and a thinner layer coating can be performed, so that quality is improved. And the effect of increasing production efficiency due to the fact that high-speed coating has become possible.
第１図は本発明の塗布方法の１実施例の横断面図，第２
図は本発明の別の実施態様を示す横断面図である。 1,2……塗布液 ３……エクストルージョン型注液器 ４……キャビティ 5,6……スロット Da,Db……スロットのクリアランス la,lb……スロット長FIG. 1 is a cross-sectional view of one embodiment of the coating method of the present invention, and FIG.
The figure is a cross sectional view showing another embodiment of the present invention. 1,2 ... Coating liquid 3 ... Extrusion type liquid injector 4 ... Cavity 5,6 ... Slot D a , D b ... Slot clearance la, lb ... Slot length
フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) B05D 1/30,1/26 B05C 5/00 103 B05C 5/02 G03C 1/74 Continuation of the front page (58) Field surveyed (Int.Cl. 6 , DB name) B05D 1 / 30,1 / 26 B05C 5/00 103 B05C 5/02 G03C 1/74
Claims (2)
エクストルージョン型注液器よりウエブ上に、自由落下
塗布液膜により塗布を行う方法において、該自由落下塗
布液膜の流下量が0.5cc/cm・sec以下の流量で、20cps以
下の粘度の塗布液を、前記スロットの液抵抗を大きくし
て塗布を行うことを特徴とする塗布方法In a method of applying a free-falling coating liquid film on a web from an extrusion-type liquid injector in which a liquid pool portion exists above a slot, the free-falling coating liquid film has a flow rate of 0.5 cc. A coating method comprising applying a coating liquid having a viscosity of 20 cps or less at a flow rate of not more than / cmsec, by increasing the liquid resistance of the slot.
することを特徴とする請求項（１）記載の塗布方法。2. A coating method according to claim 1, wherein the clearance of said slot is 0.5 mm or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25886689A JP2916540B2 (en) | 1989-10-05 | 1989-10-05 | Coating method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25886689A JP2916540B2 (en) | 1989-10-05 | 1989-10-05 | Coating method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03123672A JPH03123672A (en) | 1991-05-27 |
| JP2916540B2 true JP2916540B2 (en) | 1999-07-05 |
Family
ID=17326124
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25886689A Expired - Fee Related JP2916540B2 (en) | 1989-10-05 | 1989-10-05 | Coating method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2916540B2 (en) |
-
1989
- 1989-10-05 JP JP25886689A patent/JP2916540B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03123672A (en) | 1991-05-27 |
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