JPH08318190A - Device for coating electrophotographic photoreceptor - Google Patents
Device for coating electrophotographic photoreceptorInfo
- Publication number
- JPH08318190A JPH08318190A JP12468095A JP12468095A JPH08318190A JP H08318190 A JPH08318190 A JP H08318190A JP 12468095 A JP12468095 A JP 12468095A JP 12468095 A JP12468095 A JP 12468095A JP H08318190 A JPH08318190 A JP H08318190A
- Authority
- JP
- Japan
- Prior art keywords
- coating
- tank
- inner diameter
- supply port
- feed port
- 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.)
- Pending
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、電子写真用感光体の
感光層を形成する塗布装置に係わり、特に塗布装置の一
部を構成する塗布槽の形状改良に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating apparatus for forming a photosensitive layer of an electrophotographic photoreceptor, and more particularly to improving the shape of a coating tank which constitutes a part of the coating apparatus.
【０００２】[0002]
【従来の技術】近年高画質機能を有する印刷装置の発達
に伴い、それらの装置で使用される感光体については感
光層の成膜過程で従来問題とならなかった僅かな膜厚の
ばらつきでもその機能の大幅な低下につながるため、従
来に比較してより薄く成膜できかつより均一な膜厚を得
ることができる浸漬法が簡便な方法として広く採用され
ている。2. Description of the Related Art With the recent development of printing apparatuses having high image quality functions, even the slight variation in film thickness of the photoconductors used in those apparatuses has never been a problem in the process of forming a photosensitive layer. The dipping method is widely used as a simple method because it can significantly reduce the function and can form a thinner film and obtain a more uniform film thickness than the conventional method.
【０００３】浸漬法では光導電材料をバインダー樹脂と
ともに有機溶剤に溶解あるいは分散させ、場合によって
はさらに粘着剤，可塑剤などを加えて塗布液を作成し、
この液を塗布槽に充填した中に中空部を密閉した円筒状
導電性基体を浸漬し、その後引き上げてこの基体の表面
に付着している塗布液を乾燥させて薄膜の層を形成す
る。このような塗布工程を成膜の積層数に対応した別々
の塗布装置で順次繰り返すことにより円筒状導電性基体
の外表面に感光層塗膜が形成される。In the dipping method, a photoconductive material is dissolved or dispersed in an organic solvent together with a binder resin, and in some cases, a pressure sensitive adhesive, a plasticizer or the like is further added to prepare a coating solution,
A cylindrical conductive substrate having a closed hollow portion is immersed in this solution filled in a coating tank and then pulled up to dry the coating solution adhering to the surface of the substrate to form a thin film layer. Such a coating process is sequentially repeated with different coating devices corresponding to the number of laminated layers to form a photosensitive layer coating film on the outer surface of the cylindrical conductive substrate.
【０００４】図２は従来の技術として浸漬法による電子
写真用感光体の塗布装置の一般的な構成を示す断面図で
あり、塗布槽１と、貯留槽２と、オーバーフロー配管３
と、供給配管３ａ，３ｂと、循環ポンプ５などからな
り、塗布槽１に塗布液８を充填し、この塗布槽１から溢
れ出た塗布液８は塗布槽１の外周を取り巻くドーナツ状
の受皿１ａからこの受皿１ａに接続されたオーバーフロ
ー配管３を介して貯留槽２に上部から流入するようにし
ている。また貯留槽２の下部に設けられた供給配管３ａ
と塗布槽１の下部に設けられた供給配管３ｂとの間に循
環ポンプ５を接続して貯留槽２と塗布槽１を連結し、循
環ポンプ５の駆動により貯留槽２内の塗布液８を移送
し、供給配管３ｂの端部で塗布槽１の内面に開口する供
給口６から塗布槽１内へ塗布液８を流入させ、塗布槽１
の上部から塗布液８がオーバーフローするように常時循
環させて塗布槽１の液面を一定に保っている。さらに受
皿１ａの開口部には円筒状導電性基体７を挿入し得る孔
４ａを有する覆い蓋４が着脱可能な状態で取り付けてあ
り、この孔４ａを通して中空部を密閉した円筒状導電性
基体７を矢印Ｐの方向に下降させて塗布液８に浸漬し、
その後矢印Ｑの方向に引き上げるための図示しない昇降
装置が塗布槽１の横側に別設されている。FIG. 2 is a sectional view showing a general structure of a coating apparatus for electrophotographic photoconductors by a dipping method as a conventional technique. A coating tank 1, a storage tank 2, and an overflow pipe 3 are shown.
And a supply pipe 3a, 3b, a circulation pump 5 and the like, the coating tank 1 is filled with the coating solution 8, and the coating solution 8 overflowing from the coating tank 1 is a donut-shaped tray surrounding the outer periphery of the coating tank 1. From 1a, it is made to flow from the upper part into the storage tank 2 through the overflow pipe 3 connected to this tray 1a. Further, the supply pipe 3a provided in the lower part of the storage tank 2
A circulation pump 5 is connected between the storage tank 2 and the coating tank 1 provided at a lower portion of the coating tank 1, and the storage tank 2 and the coating tank 1 are connected to each other. The coating liquid 8 is transferred into the coating tank 1 through the supply port 6 that opens at the inner surface of the coating tank 1 at the end of the supply pipe 3b.
The liquid level of the coating tank 1 is kept constant by constantly circulating the coating liquid 8 so that it overflows from above. Further, a cover 4 having a hole 4a into which a cylindrical conductive substrate 7 can be inserted is detachably attached to the opening of the tray 1a, and the hollow cylindrical conductive substrate 7 is sealed through the hole 4a. Is lowered in the direction of arrow P and immersed in the coating liquid 8,
Thereafter, an elevating device (not shown) for pulling up in the direction of arrow Q is separately provided on the lateral side of the coating tank 1.
【０００５】[0005]
【発明が解決しようとする課題】ところが前述の塗布装
置によれば、浸漬法により円筒状導電性基体を塗布液中
に浸漬して感光層を形成する過程で、円筒状導電性基体
の下端部に縞状の塗布ムラが発生することがあり、その
結果が感光体の電気特性上のムラとなって現れ、電子写
真装置にこの感光体を用いると画像濃度ムラなどを引き
起こすため印字不良の原因になるという問題がある。However, according to the above-mentioned coating apparatus, the lower end portion of the cylindrical conductive substrate is formed in the process of forming the photosensitive layer by immersing the cylindrical conductive substrate in the coating liquid by the dipping method. Striped coating unevenness may occur on the surface, and the result appears as unevenness in the electrical characteristics of the photoconductor, and when this photoconductor is used in an electrophotographic device, it causes image density unevenness, etc. There is a problem that becomes.
【０００６】この発明は前記の問題点に鑑みてなされた
ものであり、その目的は印字不良の原因となる塗布ムラ
をなくすため、塗布槽の底部に設けられた供給口から流
入する塗布液が塗布槽の底部で均一な液流を形成するよ
うに塗布槽及び供給口の形状構成を改良して、良好な印
字品質が得られる電子写真用感光体の塗布装置を提供す
ることにある。The present invention has been made in view of the above problems, and its purpose is to eliminate the coating unevenness that causes defective printing, so that the coating solution flowing from a supply port provided at the bottom of the coating tank is used. It is an object of the present invention to provide a coating device for an electrophotographic photosensitive member that can obtain good printing quality by improving the configuration of the coating tank and the supply port so that a uniform liquid flow is formed at the bottom of the coating tank.
【０００７】[0007]
【課題を解決するための手段】この発明によれば前述の
目的は、浸漬法により円筒状導電性基体の外表面に感光
層塗膜を形成するための塗布液を有する円筒形の塗布槽
と、この塗布槽の底部に設けられた供給口から前記塗布
液を供給し、上部からオーバーフローした塗布液を前記
供給口から再供給する塗布液循環機構とを備えた塗布装
置において、供給口の内周直径を塗布槽の内周直径に対
して１／１０以上の大きさとしたことにより達成され
る。According to the present invention, the above-mentioned object is to provide a cylindrical coating tank having a coating solution for forming a photosensitive layer coating film on the outer surface of a cylindrical conductive substrate by a dipping method. In a coating apparatus provided with a coating liquid circulating mechanism for supplying the coating liquid from a supply port provided at the bottom of the coating tank and re-supplying the coating liquid overflowing from the upper part, This is achieved by setting the peripheral diameter to 1/10 or more of the inner peripheral diameter of the coating tank.
【０００８】[0008]
【作用】この発明の構成によれば、一般に塗布槽内へ流
入する塗布液の供給口直近での流速はほぼ供給口と塗布
槽の断面積の比に従って減速されるが、この減速の程度
（減速比）が大きすぎると供給口の直近が乱流状態とな
って塗布ムラを発生する原因となるため、供給口の内周
直径を塗布槽の内周直径に対して１／１０以上の大きさ
として供給口と塗布槽の断面積の比を１／１００以下と
し、減速比をほぼ１／１００以下に抑えたことにより、
供給口直近での乱流発生を抑制して塗布槽の底部に浸漬
された円筒状導電性基体の下端部に塗布液が均一に付着
することを可能にして塗布ムラの発生を防止している。According to the structure of the present invention, generally, the flow velocity of the coating liquid flowing into the coating tank immediately in the vicinity of the supply port is reduced substantially according to the ratio of the sectional area of the supply port and the coating tank. If the reduction ratio) is too large, turbulent flow will occur in the immediate vicinity of the supply port, causing uneven coating. Therefore, the inner diameter of the supply port should be 1/10 or more of the inner diameter of the coating tank. As a result, the ratio of the cross-sectional area between the supply port and the coating tank is set to 1/100 or less, and the reduction ratio is suppressed to about 1/100 or less.
The occurrence of turbulent flow in the immediate vicinity of the supply port is suppressed, and the coating liquid is allowed to uniformly adhere to the lower end of the cylindrical conductive substrate immersed in the bottom of the coating tank, thus preventing the occurrence of coating unevenness. .
【０００９】なお供給口の内周直径を塗布槽の内周直径
に対して１／１０以上の大きさとしたことについては、
供給口の内周直径と塗布槽の内周直径を変化させて種々
実験をした結果見出したものである。Regarding the fact that the inner diameter of the supply port is set to 1/10 or more of the inner diameter of the coating tank,
This is the result of various experiments conducted by changing the inner diameter of the supply port and the inner diameter of the coating tank.
【００１０】[0010]
【実施例】図１はこの発明の実施例を説明するための電
子写真用感光体の塗布装置における塗布槽下部の断面図
であり、内周直径Ｄを有する円筒形の塗布槽１の底部に
内周直径ｄを有する供給口６が開口し、供給配管３ｂを
介して移送されてくる塗布液８が、この供給口６からほ
ぼ（ｄ／Ｄ）の二乗に減速されて塗布槽１内に吐出され
る。塗布槽下部の構成以外は図２に示す従来の技術によ
る塗布装置と同様の構成であるので説明は省略する。 （実施例１，３）塗布槽１として内周直径φ６０ｍｍ×
円筒長さ３３０ｍｍのものを使用し、供給口６として内
周直径φ６ｍｍのもの（実施例１）と内周直径φ１０ｍ
ｍのもの（実施例３）とを用意し、直径φ３０ｍｍ×長
さ３００ｍｍの円筒状導電性基体７を塗布液８に浸漬し
た状態から３〜５ｍｍ／秒の速さで引き上げてもオーバ
ーフロー可能な流量の塗布液を供給できる条件におい
て、通常の塗布工程を経た後に塗布外観を観察し確認し
た。 （実施例２，４）塗布槽１として内周直径φ１２０ｍｍ
×円筒長さ３３０ｍｍのものを使用し、供給口６として
内周直径φ１２ｍｍのもの（実施例２）と内周直径φ２
０ｍｍのもの（実施例４）とを用意したことのほかは実
施例１と同様にして塗布外観を観察し確認した。 （比較例１）供給口６として内周直径φ４ｍｍのものを
用意したことのほかは実施例１と同様にして塗布外観を
観察し確認した。 （比較例２）供給口６として内周直径φ１０ｍｍのもの
を用意したことのほかは実施例２と同様にして塗布外観
を観察し確認した。1 is a cross-sectional view of a lower portion of a coating tank in an electrophotographic photoreceptor coating apparatus for explaining an embodiment of the present invention, in which a bottom portion of a cylindrical coating tank 1 having an inner diameter D is provided. The supply port 6 having the inner diameter d is opened, and the coating liquid 8 transferred through the supply pipe 3b is decelerated from the supply port 6 to the square of (d / D) and is supplied into the coating tank 1. Is ejected. Other than the configuration of the lower part of the coating tank, the configuration is the same as that of the conventional coating device shown in FIG. (Examples 1 and 3) Inner diameter of the coating tank 1 was 60 mm x
A cylindrical length of 330 mm is used, and the supply port 6 has an inner diameter of 6 mm (Example 1) and an inner diameter of 10 m.
m (Example 3) and the cylindrical conductive substrate 7 having a diameter of 30 mm and a length of 300 mm is immersed in the coating liquid 8 and pulled up at a rate of 3 to 5 mm / sec. The appearance of the coating was observed and confirmed after the usual coating process under the condition that the coating liquid at a flow rate could be supplied. (Examples 2 and 4) Inner diameter of the coating tank 1 is 120 mm.
× A cylindrical length of 330 mm is used, and the supply port 6 has an inner diameter of 12 mm (Example 2) and an inner diameter of φ2.
The coating appearance was observed and confirmed in the same manner as in Example 1 except that the one with 0 mm (Example 4) was prepared. (Comparative Example 1) The coating appearance was observed and confirmed in the same manner as in Example 1 except that the supply port 6 having an inner diameter of 4 mm was prepared. (Comparative Example 2) The coating appearance was observed and confirmed in the same manner as in Example 2 except that the supply port 6 having an inner diameter of 10 mm was prepared.
【００１１】これらの結果を表１に示す。The results are shown in Table 1.
【００１２】[0012]
【表１】 表１で判るように、供給口６の内周直径ｄと塗布槽１の
内周直径Ｄの比ｄ／Ｄが１／１０以上の大きさとした場
合は円筒状導電性基体７の下端部に塗布ムラの発生はな
いが、ｄ／Ｄが１／１０未満の大きさとした場合は円筒
状導電性基体７の下端部に塗布ムラが発生する。[Table 1] As can be seen from Table 1, when the ratio d / D of the inner diameter d of the supply port 6 and the inner diameter D of the coating tank 1 is set to 1/10 or more, the lower end portion of the cylindrical conductive substrate 7 is Although no coating unevenness occurs, when d / D is less than 1/10, coating unevenness occurs at the lower end of the cylindrical conductive substrate 7.
【００１３】[0013]
【発明の効果】この発明によれば、浸漬法により円筒状
導電性基体の外表面に感光層塗膜を形成するための塗布
液を有する円筒形の塗布槽と、この塗布槽の底部に設け
られた供給口から前記塗布液を供給し、上部からオーバ
ーフローした塗布液を前記供給口から再供給する塗布液
循環機構とを備えた塗布装置において、供給口の内周直
径を塗布槽の内周直径に対して１／１０以上の大きさと
したことにより、円筒状導電性基体の下端部近傍の液流
が乱流状態になることを抑制できるので、基体の下端部
に塗布液が均一に付着するため塗布ムラを生じにくくす
ることができ、その結果均一な膜厚を備え画像濃度ムラ
のない電子写真用感光体を製造することができるので、
良好な印字品質の電子写真装置用感光体を提供すること
が可能となる。According to the present invention, a cylindrical coating tank having a coating solution for forming a photosensitive layer coating film on the outer surface of a cylindrical conductive substrate by a dipping method, and a coating tank provided at the bottom of the coating tank are provided. In the coating apparatus having a coating solution circulating mechanism which supplies the coating solution from the supply port and supplies the coating solution overflowing from the top again from the supply port, the inner diameter of the supply port is defined by the inner diameter of the coating tank. By making the size 1/10 or more of the diameter, it is possible to prevent the liquid flow in the vicinity of the lower end of the cylindrical conductive substrate from becoming a turbulent state, so that the coating liquid adheres uniformly to the lower end of the substrate. Therefore, it is possible to prevent coating unevenness from occurring, and as a result, it is possible to manufacture an electrophotographic photoreceptor having a uniform film thickness and having no image density unevenness.
It is possible to provide a photoconductor for an electrophotographic apparatus having good print quality.
【図１】実施例説明の塗布槽部の構成を示す部分断面図FIG. 1 is a partial cross-sectional view showing a configuration of a coating tank portion according to an embodiment.
【図２】従来の技術説明の塗布装置の断面図FIG. 2 is a cross-sectional view of a coating device according to a conventional technique.
１ 塗布槽 ３ｂ 供給配管 ６ 供給口 ７ 円筒状導電性基体 ８ 塗布液 1 Coating Tank 3b Supply Pipe 6 Supply Port 7 Cylindrical Conductive Substrate 8 Coating Liquid
Claims (1)
感光層塗膜を形成するための塗布液を有する円筒形の塗
布槽と、この塗布槽の底部に設けられた供給口から前記
塗布液を供給し、上部からオーバーフローした塗布液を
前記供給口から再供給する塗布液循環機構とを備えた塗
布装置において、供給口の内周直径を塗布槽の内周直径
に対して１／１０以上の大きさとしたことを特徴とする
電子写真用感光体の塗布装置。1. A cylindrical coating tank having a coating liquid for forming a photosensitive layer coating film on the outer surface of a cylindrical conductive substrate by a dipping method, and a supply port provided at the bottom of the coating tank. In a coating apparatus having a coating solution circulating mechanism for supplying a coating solution and re-feeding the coating solution overflowing from the top, the inner diameter of the supply port is 1 / the inner diameter of the coating tank. An electrophotographic photoreceptor coating device having a size of 10 or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12468095A JPH08318190A (en) | 1995-05-24 | 1995-05-24 | Device for coating electrophotographic photoreceptor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12468095A JPH08318190A (en) | 1995-05-24 | 1995-05-24 | Device for coating electrophotographic photoreceptor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08318190A true JPH08318190A (en) | 1996-12-03 |
Family
ID=14891419
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12468095A Pending JPH08318190A (en) | 1995-05-24 | 1995-05-24 | Device for coating electrophotographic photoreceptor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08318190A (en) |
-
1995
- 1995-05-24 JP JP12468095A patent/JPH08318190A/en active Pending
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