JP2002045752A - Application device - Google Patents
Application deviceInfo
- Publication number
- JP2002045752A JP2002045752A JP2000231493A JP2000231493A JP2002045752A JP 2002045752 A JP2002045752 A JP 2002045752A JP 2000231493 A JP2000231493 A JP 2000231493A JP 2000231493 A JP2000231493 A JP 2000231493A JP 2002045752 A JP2002045752 A JP 2002045752A
- Authority
- JP
- Japan
- Prior art keywords
- coating liquid
- coating
- tank
- circulation tank
- liquid
- 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
Landscapes
- Coating Apparatus (AREA)
- Photoreceptors In Electrophotography (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は浸漬塗布法によりドラム
外周面に感光性物質を塗布して電子写真感光体ドラムを
製造する装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for producing an electrophotographic photosensitive drum by applying a photosensitive substance to a drum outer peripheral surface by a dip coating method.
【０００２】[0002]
【従来の技術】電子写真感光体ドラムは通常アルミニウ
ムなどからなる円筒状基体の外周面に有機感光材料を含
む塗布液を塗布して感光層を形成する。塗布方法として
は浸漬塗布法、スプレー塗布法、リングコート法などが
あるが、比較的均一な膜圧と塗膜を得ることができ、し
かも生産性の高い浸漬塗布法が一般に採用されている。
一般的な浸漬塗布法は塗布液の収容されている塗工タン
クに円筒状基体を浸漬させ、再び引き上げてその外周面
に塗布液を塗布するするものであるが、浸漬する際塗工
タンクの上縁部からオーバーフローする塗布液を回収し
循環タンクを経て再度塗工タンクに戻す循環式である。2. Description of the Related Art In an electrophotographic photosensitive drum, a photosensitive layer is formed by applying a coating solution containing an organic photosensitive material to an outer peripheral surface of a cylindrical substrate usually made of aluminum or the like. As a coating method, there are a dip coating method, a spray coating method, a ring coating method and the like, and a dip coating method capable of obtaining a relatively uniform film pressure and a coating film and having high productivity is generally adopted.
In a general dip coating method, a cylindrical substrate is immersed in a coating tank containing a coating liquid, and then pulled up again to apply the coating liquid to its outer peripheral surface. This is a circulation type in which the coating liquid overflowing from the upper edge is collected and returned to the coating tank via the circulation tank.
【０００３】従来の循環式浸漬塗布法の装置について簡
単に説明する。図２は、浸漬塗布法の従来の塗布装置の
一例を示す概念図である。図２において、１は塗布液３
が収容されており円筒状基体１０が浸漬され引き上げら
れる塗工タンク、２は塗布液３が貯留され、塗工タンク
１に塗布液３を送液する循環タンクであり、塗布液３は
塗布液タンク２の下部と塗工タンク１の下部とを連結す
る配管４を通って圧送ポンプ６により塗工タンク１の下
部に送りこまれ、その上縁部からオーバーフローしてこ
れを受ける樋９を経て配管７を通って塗布液タンク２に
還流するように循環する。[0003] A conventional apparatus of the circulation type dip coating method will be briefly described. FIG. 2 is a conceptual diagram illustrating an example of a conventional coating apparatus using a dip coating method. In FIG. 2, 1 is a coating liquid 3
Is a coating tank in which the cylindrical substrate 10 is immersed and pulled up, 2 is a circulation tank for storing the coating liquid 3 and sending the coating liquid 3 to the coating tank 1, and the coating liquid 3 is a coating liquid. It is sent to the lower part of the coating tank 1 by a pressure pump 6 through a pipe 4 connecting the lower part of the tank 2 and the lower part of the coating tank 1, and flows through a gutter 9 which overflows from its upper edge and receives it. 7 and circulates back to the coating liquid tank 2.
【０００４】このような塗布装置を用いて、塗布液３を
循環させながら、塗工タンク１に、円筒内部に塗布液が
入り込まないような機構を付設された円筒状基体１０を
その円筒軸をほぼ鉛直に保持して、円筒軸方向に浸漬
し、続いて所定の速度で引き上げることにより、円筒状
基体１０の外表面に膜厚均一で均質な塗膜を形成する。
その場合、塗工タンク１に円筒状基体１０を浸漬すると
きには基体の体積に相当する分量の塗布液が定常のオー
バーフロー量にプラスされてオーバーフローするので塗
布液面が上昇し、引き上げるときには塗布液面が下がる
という液面変動が生じる。このために、基体の塗布液面
に対する引き上げ速度が変化することになり、基体外表
面に塗布液が均一に塗布され得ないことになる。このよ
うな液面変動の影響をできるだけ少なくするために、塗
布液の循環量を調節し、基体を引き上げるときに途切れ
ることなく塗布液がオーバーフローしている状態を保ち
ながら塗布する方法が採られる。Using such a coating apparatus, a cylindrical substrate 10 provided with a mechanism for preventing the coating liquid from entering the inside of the cylinder is placed in the coating tank 1 while the coating liquid 3 is circulated. By holding the tube almost vertically and immersing it in the direction of the cylinder axis, and then pulling it up at a predetermined speed, a uniform and uniform coating film is formed on the outer surface of the cylindrical substrate 10.
In this case, when the cylindrical substrate 10 is immersed in the coating tank 1, an amount of the coating liquid corresponding to the volume of the substrate is added to the steady overflow amount and overflows. , The liquid level changes. For this reason, the pulling speed of the substrate with respect to the coating liquid level changes, and the coating liquid cannot be uniformly applied to the outer surface of the substrate. In order to minimize the influence of such liquid level fluctuation, a method is adopted in which the amount of circulation of the coating liquid is adjusted, and the liquid is applied while the coating liquid overflows without interruption when lifting the substrate.
【０００５】[0005]
【発明が解決しようとする課題】このような循環式塗布
装置において、オーバーフローした液を回収する方法と
しては循環タンクと塗工タンクの高低差を利用して塗工
液を回収する自由落下方式と、ポンプにて回収する方法
がある。In such a circulation type coating apparatus, as a method for collecting the overflowed liquid, there is a free fall method in which the coating liquid is collected by utilizing the height difference between the circulation tank and the coating tank. , There is a method of collecting with a pump.
【０００６】これらの回収方法においてそれぞれ以下の
ような問題点がある。すなわち、自由落下方式はポンプ
等の駆動が必要としない簡便な方法であるが、塗工タン
クと循環タンクの位置関係を考慮する必要がある。また
回収された塗布液が循環タンクに収容されるとき塗布液
面に落下することによる衝撃で泡が発生する。またポン
プにて回収する方法は塗工タンクと循環タンクの位置関
係を考慮する必要はないが、ポンプの種類や駆動方式に
よって送液時に泡の噛み込みが発生する。これらの泡が
塗布液に存在すると塗布された感光体ドラムの感光層に
付着して、不良品となり歩留低下の原因になる。とくに
円筒状基体を塗工タンクからの引き上げに際して、円筒
状基体が塗布液から離液するとき液面に泡が発生し、塗
布液のオバーフローとともに配管を通じて循環タンクに
移される。塗布液の粘度が高い場合は、この泡が消える
ことなく塗布装置内を循環し、泡が塗布液に存在すると
同様に塗布された感光体ドラムの感光層に付着して、不
良品となり歩留低下の原因になる。[0006] Each of these recovery methods has the following problems. That is, the free fall method is a simple method that does not require driving of a pump or the like, but it is necessary to consider the positional relationship between the coating tank and the circulation tank. In addition, when the collected coating liquid is stored in the circulation tank, bubbles are generated due to an impact caused by falling on the coating liquid surface. Although it is not necessary to consider the positional relationship between the coating tank and the circulating tank when collecting with a pump, bubbles may be caught at the time of liquid feeding depending on the type of pump and the driving method. If these bubbles are present in the coating liquid, they adhere to the coated photosensitive layer of the photosensitive drum, resulting in defective products and a reduction in yield. In particular, when the cylindrical substrate is lifted from the coating tank, bubbles are generated on the liquid surface when the cylindrical substrate separates from the coating liquid, and are transferred to the circulation tank through a pipe together with the overflow of the coating liquid. When the viscosity of the coating liquid is high, the bubbles circulate in the coating device without disappearing, and if the bubbles are present in the coating liquid, they adhere to the photosensitive layer of the coated photosensitive drum in the same manner, resulting in a defective product and yield. May cause a drop.
【０００７】[0007]
【課題を解決するための手段】上記の課題を解決するた
め、この発明によれば円筒状基体をその円筒軸をほぼ鉛
直に保持した状態で、塗布液に浸漬し、塗布液から外部
に引き上げることにより前記円筒状基体の外表面に塗布
液を塗布する塗布装置において、塗布液を収容しており
前記円筒状基体が浸漬される塗工タンクと、塗布液を塗
工タンクに循環させる循環タンクを有し、塗布液を循環
タンクの下部から圧送ポンプで塗工タンク下部に送り込
み，塗工タンク上縁部からオーバーフローさせて循環タ
ンクに送り込む塗布液循環機構を備えるとともにオーバ
ーフローした塗布液を循環タンクに導く配管には内壁に
凹凸を設けたことによって達成される。また、前記配管
の出口は循環タンクの塗布液面に浮かぶようにしたこと
によって達成される。さらに、前記配管は少なくとも循
環タンクの半周分は内壁に沿って配置するとともに出口
近傍を水平に保つことによって達成される。According to the present invention, in order to solve the above-mentioned problems, a cylindrical substrate is immersed in a coating solution with its cylindrical axis held substantially vertically, and pulled up from the coating solution to the outside. In a coating apparatus for coating a coating liquid on the outer surface of the cylindrical substrate, a coating tank containing the coating liquid and immersing the cylindrical substrate, and a circulation tank for circulating the coating liquid to the coating tank A coating liquid circulating mechanism that feeds the coating liquid from the lower part of the circulation tank to the lower part of the coating tank with a pressure pump, overflows the upper edge of the coating tank, and feeds the coating liquid to the circulation tank. This is achieved by providing irregularities on the inner wall of the pipe leading to the pipe. The outlet of the pipe is achieved by floating on the surface of the coating liquid in the circulation tank. Further, the piping is achieved by arranging at least a half circumference of the circulation tank along the inner wall and keeping the vicinity of the outlet horizontal.
【０００８】[0008]
【発明の実施の形態】図面を用いてこの発明を説明す
る。図１はこの発明の塗布装置の一例の概念図で、１は
塗工タンク、２は循環タンクである。塗布液３は循環タ
ンク２の下部と塗工タンク１の下部とを連結する配管４
を通って圧送ポンプ６により塗工タンク１に送り込ま
れ、その上縁部からオーバーフローしてこれを受ける樋
９を経て配管７を通って循環タンク２に送り込まれるこ
とにより塗布装置内を循環する。配管７の内面には凹凸
８が設けられている。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to the drawings. FIG. 1 is a conceptual diagram of an example of a coating apparatus according to the present invention, wherein 1 is a coating tank and 2 is a circulation tank. The coating liquid 3 is connected to a pipe 4 connecting the lower part of the circulation tank 2 and the lower part of the coating tank 1.
Is fed into the coating tank 1 by the pressure feed pump 6, overflows from the upper edge thereof, passes through the gutter 9 which receives the overflow, and is sent to the circulation tank 2 through the pipe 7 to circulate in the coating apparatus. Irregularities 8 are provided on the inner surface of the pipe 7.
【０００９】配管７は循環タンク２内に連通しており、
循環タンク２内で少なくとも半周以上内壁に沿って回さ
れており、その先は自由端となって塗布液３の液面に浮
いた状態になっている。配管７の出口開口１２近傍は約
１００ｍｍ程が液面と平行、すなわち水平を保つように
浮１１などで支えられている。[0009] The pipe 7 communicates with the circulation tank 2.
It is turned along the inner wall at least half a circumference in the circulating tank 2, and its free end is floating on the liquid surface of the coating liquid 3. In the vicinity of the outlet opening 12 of the pipe 7, about 100 mm is supported by a float 11 or the like so as to keep it parallel to the liquid surface, that is, horizontal.
【００１０】このような装置を用い、塗布液３を循環さ
せながら、円筒内部に塗布液が入り込まないような機構
を付設された円筒状基体１０を図示はしてない昇降手段
により双方向矢印Ａのように軸方向に鉛直に移動させ、
塗工タンク１に浸漬し引き上げることにより塗布を行
う。円筒状基体１０を浸漬するときには塗工タンク１の
上縁部からオーバーフローする塗布液量は増大する。Using such an apparatus, while circulating the coating liquid 3, the cylindrical substrate 10 provided with a mechanism for preventing the coating liquid from entering the inside of the cylinder is moved by a bidirectional arrow A by a lifting means (not shown). Move vertically in the axial direction like
The coating is performed by dipping in the coating tank 1 and lifting it up. When the cylindrical substrate 10 is immersed, the amount of the coating liquid overflowing from the upper edge of the coating tank 1 increases.
【００１１】とくに円筒状基体１０は引き上げられると
き、塗工タンク１内の塗布液面上に余分な塗布液が落下
して、その衝撃や液面の急激な変化になどにより泡が発
生し、オーバーフローした塗布液３の受け皿としての樋
９内に回収され配管７内を流れる。泡は一般的に密度が
小さく塗布液３の上層部に集中するので、配管７内を流
れる塗布液の表面を流れることになる。そこで配管７内
に設けた凹凸８により配管７内を流れる塗布液３は流速
低下し、泡の発生を抑えるとともに発生した泡は捕捉さ
れたりまたは消失したりする。In particular, when the cylindrical substrate 10 is lifted, excess coating liquid drops on the coating liquid surface in the coating tank 1, and bubbles are generated due to the impact or a sudden change in the liquid level. The overflowed coating liquid 3 is collected in a gutter 9 as a receiving tray and flows through the pipe 7. Bubbles generally have a low density and concentrate in the upper layer of the coating liquid 3, and therefore flow on the surface of the coating liquid flowing in the pipe 7. Therefore, the flow rate of the coating liquid 3 flowing in the pipe 7 is reduced by the unevenness 8 provided in the pipe 7, and the generation of bubbles is suppressed, and the generated bubbles are trapped or disappear.
【００１２】また図３に示すように配管７は循環タンク
２に接続されるのではなく、その内部に連通して塗布液
面まで循環タンク７の内壁に沿って半周以上回されてお
り、さらにその先が自由端となって塗布液３の液面に浮
かぶ構成になっているので、オーバーフローした塗布液
３を循環タンク２内に還流されるとき塗布液落下による
衝撃が軽減され泡の発生が殆どない。Further, as shown in FIG. 3, the pipe 7 is not connected to the circulation tank 2 but is communicated with the inside of the circulation tank 2 and is turned around the inner wall of the circulation tank 7 by a half turn or more to the coating liquid level. Since the tip is a free end and floats on the surface of the coating liquid 3, when the overflowing coating liquid 3 is recirculated into the circulation tank 2, the impact due to the falling of the coating liquid is reduced and bubbles are generated. Almost no.
【００１３】配管７はポリエチレンの蛇腹ホースなどを
使用し、循環タンク２に設けた開口にシーリング部材で
密閉されて内部に導かれ、少なくとも循環タンク７内を
内壁に沿って回し、その先端部には浮力調整され出口開
口１２が液面に略等しくなるようにステンレス等金属製
の中空箱のような浮１１を設けるとともに、少なくとも
その先端部１００ｍｍ程は水平に保つようにしてある。The pipe 7 uses a bellows hose made of polyethylene or the like. The pipe 7 is hermetically sealed by an opening provided in the circulation tank 2 with a sealing member, and is guided inside. Is provided with a float 11 such as a hollow box made of metal such as stainless steel so that the buoyancy is adjusted and the outlet opening 12 becomes substantially equal to the liquid surface, and at least the tip portion of the float 11 is kept horizontal at least about 100 mm.
【００１４】[0014]
【発明の効果】この発明においては、円筒状基体をその
円筒軸をほぼ鉛直に保持した状態で、塗布液に浸漬し、
塗布液から外部に引き上げることにより前記円筒状基体
の外表面に塗布液を塗布する塗布装置において、塗布液
を収容しており前記円筒状基体が浸漬される塗工タンク
と、塗布液を塗工タンクに循環させる循環タンクを有
し、塗布液を循環タンクの下部から圧送ポンプで塗工タ
ンク下部に送り込み，塗工タンク上縁部からオーバーフ
ローさせて循環タンクに送り込む塗布液循環機構を備え
るとともにオーバーフローした塗布液を循環タンクに導
く配管には内壁に凹凸を設けたことを特徴とする。ま
た、前記配管の出口は循環タンクの塗布液面に位置する
ようにしたことを特徴とする。さらに、前記配管は少な
くとも循環タンクの半周分は内壁に沿って配置するとと
もに出口近傍を水平に保つことを特徴とする。According to the present invention, a cylindrical substrate is immersed in a coating solution while its cylindrical axis is held substantially vertically.
In a coating apparatus for applying a coating liquid to the outer surface of the cylindrical substrate by pulling up the coating liquid to the outside, a coating tank containing the coating liquid and immersing the cylindrical substrate, and coating the coating liquid It has a circulation tank that circulates through the tank, and has a coating liquid circulation mechanism that sends the coating liquid from the lower part of the circulation tank to the lower part of the coating tank with a pressure pump, overflows from the upper edge of the coating tank, and sends it to the circulation tank. The pipe for guiding the coating liquid to the circulation tank is provided with irregularities on the inner wall. Further, an outlet of the pipe is located at a coating liquid level of the circulation tank. Further, the pipe is arranged along the inner wall for at least a half circumference of the circulation tank and keeps the vicinity of the outlet horizontal.
【００１５】このような構成の塗布装置とすることによ
り、塗布液中の気泡の発生を少なくするとともに、また
発生した気泡の後工程への移動を少なくし、円筒状基体
の外表面に成膜むらがなく十分に膜厚均一で均質なサブ
ミクロンオーダーの薄膜を浸漬塗布することができるこ
とが可能となる。By using the coating apparatus having such a configuration, the generation of bubbles in the coating liquid is reduced, and the generated bubbles are less likely to move to the subsequent process, so that the film is formed on the outer surface of the cylindrical substrate. It is possible to dip-coat a submicron-order thin film having a uniform thickness and a uniform thickness without unevenness.
【図１】この発明の塗布装置の一実施例の概念図FIG. 1 is a conceptual diagram of one embodiment of a coating apparatus of the present invention.
【図２】従来の塗布装置の一例の概念図FIG. 2 is a conceptual diagram of an example of a conventional coating apparatus.
【図３】配管と循環タンクの関係を表す概念図FIG. 3 is a conceptual diagram showing a relationship between a pipe and a circulation tank.
１ 塗工タンク ２ 循環タンク ３ 塗布液 ４，７ 配管 ６ 圧送ポンプ ８ 凹凸 ９ 樋 １０ 円筒状基体 １１ 浮 １２ 出口開口 DESCRIPTION OF SYMBOLS 1 Coating tank 2 Circulation tank 3 Coating liquid 4, 7 Piping 6 Pressure pump 8 Irregularity 9 Gutter 10 Cylindrical base 11 Floating 12 Exit opening
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【手続補正書】[Procedure amendment]
【提出日】平成１３年１月２４日（２００１．１．２
４）[Submission Date] January 24, 2001 (2001.1.2)
4)
【手続補正１】[Procedure amendment 1]
【補正対象書類名】図面[Document name to be amended] Drawing
【補正対象項目名】図１[Correction target item name] Fig. 1
【補正方法】変更[Correction method] Change
【補正内容】[Correction contents]
【図１】 FIG.
Claims (3)
持した状態で、塗布液に浸漬し、塗布液から外部に引き
上げることにより前記円筒状基体の外表面に塗布液を塗
布する塗布装置において、塗布液を収容しており前記円
筒状基体が浸漬される塗工タンクと、塗布液を塗工タン
クに循環させる循環タンクを有し、塗布液を循環タンク
の下部から圧送ポンプで塗工タンク下部に送り込み，塗
工タンク上縁部からオーバーフローさせて循環タンクに
送り込む塗布液循環機構を備えるとともにオーバーフロ
ーした塗布液を循環タンクに導く配管には内壁に凹凸を
設けたことを特徴とする塗布装置。A coating apparatus for applying a coating liquid to an outer surface of a cylindrical substrate by immersing the cylindrical substrate in a coating liquid while keeping its cylindrical axis substantially vertical, and pulling the coating liquid out of the coating liquid. In the above, there is provided a coating tank containing the coating liquid and immersed in the cylindrical substrate, and a circulation tank for circulating the coating liquid to the coating tank, and coating the coating liquid from the lower part of the circulation tank by a pressure pump. The coating is characterized by having a coating liquid circulating mechanism that feeds the coating liquid under the tank and overflows from the upper edge of the coating tank into the circulation tank, and has unevenness on the inner wall of the pipe that guides the overflowing coating liquid to the circulation tank. apparatus.
に浮かぶようにしたことを特徴とする請求項１記載の塗
布装置。。2. The coating apparatus according to claim 1, wherein an outlet of the pipe floats on a coating liquid surface of a circulation tank. .
分は内壁に沿って配置するとともに出口近傍を水平に保
つことを特徴とする請求項１及び２記載の塗布装置。3. The coating apparatus according to claim 1, wherein the pipe is arranged along the inner wall at least for a half circumference of the circulation tank, and keeps the vicinity of the outlet horizontal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000231493A JP3485870B2 (en) | 2000-07-31 | 2000-07-31 | Coating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000231493A JP3485870B2 (en) | 2000-07-31 | 2000-07-31 | Coating device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002045752A true JP2002045752A (en) | 2002-02-12 |
| JP3485870B2 JP3485870B2 (en) | 2004-01-13 |
Family
ID=18724324
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000231493A Expired - Fee Related JP3485870B2 (en) | 2000-07-31 | 2000-07-31 | Coating device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3485870B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20150039013A (en) * | 2013-10-01 | 2015-04-09 | 주식회사 엘지화학 | Coating apparatus and method using gravity difference |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105537054A (en) * | 2016-01-22 | 2016-05-04 | 珠海格力电器股份有限公司 | Coating barrel and coating system |
-
2000
- 2000-07-31 JP JP2000231493A patent/JP3485870B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20150039013A (en) * | 2013-10-01 | 2015-04-09 | 주식회사 엘지화학 | Coating apparatus and method using gravity difference |
| KR101692100B1 (en) | 2013-10-01 | 2017-01-02 | 주식회사 엘지화학 | Coating apparatus and method using gravity difference |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3485870B2 (en) | 2004-01-13 |
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