JPH0359670A - Drum coating method - Google Patents
Drum coating methodInfo
- Publication number
- JPH0359670A JPH0359670A JP19717889A JP19717889A JPH0359670A JP H0359670 A JPH0359670 A JP H0359670A JP 19717889 A JP19717889 A JP 19717889A JP 19717889 A JP19717889 A JP 19717889A JP H0359670 A JPH0359670 A JP H0359670A
- Authority
- JP
- Japan
- Prior art keywords
- drum
- coating liquid
- seconds
- coating
- photosensitive layer
- 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
- 238000000576 coating method Methods 0.000 title claims abstract description 56
- 239000011248 coating agent Substances 0.000 claims abstract description 50
- 239000007788 liquid Substances 0.000 claims abstract description 37
- 239000002904 solvent Substances 0.000 claims description 12
- 238000009835 boiling Methods 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 abstract description 6
- 238000007598 dipping method Methods 0.000 abstract 2
- 108091008695 photoreceptors Proteins 0.000 description 15
- 238000004140 cleaning Methods 0.000 description 7
- 239000011347 resin Substances 0.000 description 7
- 229920005989 resin Polymers 0.000 description 7
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 239000004014 plasticizer Substances 0.000 description 6
- 238000007654 immersion Methods 0.000 description 5
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 206010034972 Photosensitivity reaction Diseases 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000036211 photosensitivity Effects 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Landscapes
- Photoreceptors In Electrophotography (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、円筒形ドラムの外周面に塗工液を均一に塗工
する方法に関し、さらに詳しくは感光体の作製時に行わ
れるドラム塗工方法に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for uniformly applying a coating liquid to the outer peripheral surface of a cylindrical drum, and more specifically, to a method for uniformly applying a coating liquid to the outer peripheral surface of a cylindrical drum. Regarding the method.
（従来の技術）
電子写真複写機等に用いられる感光体を作製するには、
アルミニウム素管等からなるドラムを洗浄液で洗浄した
後、洗浄されたドラムを塗工液が収容されたタンクの上
方に鉛直状に配設し、次いでドラムをタンク内の塗工液
中に浸漬し、その後ドラムをタンクから取り出し、ドラ
ム外周面に塗工された塗工液を乾燥するようにしている
。(Prior art) In order to produce photoreceptors used in electrophotographic copying machines, etc.
After cleaning a drum made of aluminum pipe, etc. with a cleaning solution, the cleaned drum is placed vertically above a tank containing a coating solution, and then the drum is immersed in the coating solution in the tank. After that, the drum is removed from the tank, and the coating liquid applied to the outer circumferential surface of the drum is dried.
（発明が解決しようとする課題）
ところが、製造された感光体の外周面に引き上げ方向（
感光体の長手方向）に沿った筋が発生することがあった
。これは、樹脂、可塑剤等の異物がドラム表面に付着し
ているため、この異物の一部が塗工液で溶解され、ドラ
ムを塗工液から引き上げる際に、そのドラムの引き上げ
にともなってドラムの外周面に引き上げ方向に沿って発
生するものと思われる。このような現象は、上記した洗
浄溶剤と塗工液に含まれる溶剤とはその溶解可能な成分
が異なっているので、洗浄工程では除去されなかった樹
脂、可塑剤等が塗工工程において一部溶解し、これらが
ドラム周面に付着するために発生するものと思われる。(Problem to be Solved by the Invention) However, there is a problem in the pulling direction (
Streaks may occur along the longitudinal direction of the photoreceptor. This is because foreign matter such as resin and plasticizer is attached to the drum surface, and some of this foreign matter is dissolved by the coating fluid, and when the drum is lifted from the coating fluid, it is removed as the drum is lifted. It is thought that this occurs along the pulling direction on the outer peripheral surface of the drum. This phenomenon occurs because the above-mentioned cleaning solvent and the solvent contained in the coating solution have different soluble components, so some of the resins, plasticizers, etc. that were not removed during the cleaning process may be partially removed during the coating process. It is thought that this occurs because the particles melt and adhere to the drum circumferential surface.
また、得られた感光体の上部と下部とでは感光層の膜厚
に大きな差を生じるという問題もあった。Further, there was a problem in that there was a large difference in the thickness of the photosensitive layer between the upper and lower parts of the obtained photoreceptor.
すなわち、塗工液が塗工されたドラムを引き上げると、
塗工液の自重によって波乗れを生じるために下側の感光
層の膜厚が上側の感光層の膜厚に比べてやや厚くなるの
である。このように感光体の感光層の膜厚に差を生じる
と、光感度の違いなどから均一な濃度の画像が得られな
くなる。In other words, when the drum coated with the coating liquid is pulled up,
The thickness of the lower photosensitive layer is slightly thicker than that of the upper photosensitive layer because the weight of the coating liquid causes surfing. If there is a difference in the thickness of the photosensitive layer of the photoreceptor as described above, it becomes impossible to obtain an image with uniform density due to the difference in photosensitivity.
本発明は上記の実状に着目してなされたものであって、
その目的とすることろは、筋の発生することのない感光
体を得ることができ、しかも画像品質を向上することが
できるドラム塗工方法を提供することにある。The present invention has been made focusing on the above-mentioned situation,
The purpose is to provide a drum coating method that can obtain a photoreceptor without streaks and improve image quality.
（課題を解決するための手段）
本発明者は、ドラムを所定時間以上塗工液に浸漬するこ
とにより、感光体の周面に筋の発生を防止できることを
見いだし、また感光体の周囲に設けられた感光層の上下
部の膜厚の差を小さくできることを見いだし、本発明を
完成したものである。(Means for Solving the Problems) The present inventor has discovered that streaks can be prevented from occurring on the circumferential surface of the photoreceptor by immersing the drum in a coating liquid for a predetermined period of time or longer, and that The present invention was completed based on the discovery that the difference in film thickness between the upper and lower parts of the photosensitive layer can be reduced.
すなわち、本発明のドラム塗工方法は、円筒形ノトラム
ヲ鉛直状に配設し、このドラムの全体を塗工液に１０〜
６０秒間浸漬し、次いでドラムを塗工液より取り出すこ
とを特徴としており、そのことにより上記目的が達成さ
れる。That is, in the drum coating method of the present invention, a cylindrical notorum is arranged vertically, and the entire drum is immersed in the coating liquid for 10 to 10 minutes.
It is characterized by immersion for 60 seconds and then removing the drum from the coating liquid, thereby achieving the above object.
以下に、本発明の詳細な説明する。The present invention will be explained in detail below.
本発明で使用される塗工液は公知のものが使用され、通
常、結着樹脂、顔料及び溶剤等が分散混合されているも
のである。この塗工液が収容されたタンク内へドラムを
鉛直状に配設した状態で浸漬した後１０〜６０秒間放置
し、その後ドラムを塗工液から引き上げ、またはタンク
を下げ、そして乾燥するものである。The coating liquid used in the present invention is a known coating liquid, and usually contains a binder resin, a pigment, a solvent, etc., dispersed in the coating liquid. The drum is vertically immersed in a tank containing this coating solution, left for 10 to 60 seconds, then the drum is lifted out of the coating solution or the tank is lowered, and then dried. be.
本発明においては、上記の浸漬時間を１０〜６０秒間と
するのが特徴であり、これにより筋の発生が防止され、
均一な膜厚の感光体が得られるのである。すなわち、ド
ラムの塗工液への浸漬時間を１０秒以上とすることによ
り、得られる感光体の感光層の上下部の膜厚の差を少な
くすることができ、しかも感光体表面に筋が形成される
のを減少することができる。The present invention is characterized in that the above-mentioned immersion time is 10 to 60 seconds, which prevents the generation of streaks.
A photoreceptor with a uniform film thickness can be obtained. That is, by immersing the drum in the coating solution for 10 seconds or more, it is possible to reduce the difference in film thickness between the upper and lower parts of the photosensitive layer of the resulting photoreceptor, and to prevent the formation of streaks on the surface of the photoreceptor. It is possible to reduce the amount of
感光層の上下部の膜厚の差が小さくなる理由は、ドラム
を塗工液へ１０秒間以上浸漬することにより、塗工液の
ドラムの外周面に対するなじみが均一化するためと思わ
れる。The reason why the difference in film thickness between the upper and lower portions of the photosensitive layer becomes smaller is thought to be that by immersing the drum in the coating liquid for 10 seconds or more, the coating liquid conforms to the outer peripheral surface of the drum evenly.
つまり、塗工膜厚りは、下式（１）によって決められる
とされており、従来のようにドラムを１０秒未満塗工液
に浸漬するだけでは、ドラムに特有な定数αがドラムの
上部と下部とで異なり、従って、ドラムの上下部で感光
層の膜厚に差が生じるものと思われる。これに対して、
本発明のようにドラムを１０秒以上塗工液に浸漬すると
、ドラムの上下部、特に上部の塗工液に対する濡れ具合
いが飽和状態となるために、ドラムの上下部で塗工液に
対する濡れ具合いが近似し、つまりドラムに特有な定数
αがドラムの上部と下部とでほぼ近似するために、ドラ
ムの上下部で感光層の膜厚の差が小さくなるものと思わ
れる。In other words, the coating film thickness is said to be determined by the following formula (1), and if the drum is simply immersed in the coating solution for less than 10 seconds as in the past, the constant α unique to the drum is Therefore, it is thought that there is a difference in the thickness of the photosensitive layer between the upper and lower parts of the drum. On the contrary,
When the drum is immersed in the coating liquid for 10 seconds or more as in the present invention, the wetness of the upper and lower parts of the drum, especially the upper part, with respect to the coating liquid reaches a saturated state. It is thought that the difference in film thickness of the photosensitive layer between the upper and lower portions of the drum becomes small because the constant α unique to the drum is approximately similar between the upper and lower portions of the drum.
ｈ−α〈συ／ρｇ）３ｉ’２ ・・・（１）ｈ：
塗工膜厚、α： ドラムに特有な定数、σ：塗工液の粘
度、υニドラムと塗工液の相対的な移動速度、ρ：！！
！！工液の密度、ｇ：重力加速度。h−α〈συ/ρg)3i'2...(1)h:
Coating film thickness, α: Constant specific to the drum, σ: Viscosity of the coating liquid, υ Relative moving speed between the drum and the coating liquid, ρ: ! !
! ! Density of engineering fluid, g: gravitational acceleration.
ここで、塗工液中に含まれる溶剤は、沸点が７０℃以下
のものを使用するのが好ましい。沸点が７０℃以下の溶
剤を使用することにより、ドラムを塗工液から引き上げ
た際に、上記したようにドラムの上下部で塗工液に対す
る濡れ具合いがほぼ均一となった塗工液を速やかに乾燥
してドラムの上下全長に亘って均一な膜厚の感光層を形
成することができる。塗工液中に含まれる溶剤の沸点が
７０℃を超える場合には、塗工液の乾燥速度が遅くなる
ために、塗工液の自重による垂れが発生し易く、ドラム
の上下部に形成された感光層の膜厚の差が大きくなり易
い。Here, the solvent contained in the coating liquid preferably has a boiling point of 70° C. or lower. By using a solvent with a boiling point of 70°C or less, when the drum is lifted from the coating liquid, the coating liquid can be quickly removed so that the upper and lower parts of the drum are almost uniformly wetted. By drying, a photosensitive layer having a uniform thickness can be formed over the entire length of the drum. If the boiling point of the solvent contained in the coating liquid exceeds 70°C, the drying rate of the coating liquid will be slow, and the coating liquid will easily sag due to its own weight, forming on the top and bottom of the drum. The difference in film thickness of the photosensitive layer tends to become large.
また、感光体表面に筋が形成されるのが減少される理由
は、洗浄工程で除去されずドラム表面に付着したままの
樹脂、可塑剤等の異物のうち塗工液に含まれる溶剤に溶
解されるものが、その溶剤に充分に溶解されることによ
り洗浄されたものと思われる。通常、ドラムの洗浄工程
における洗浄溶剤としてはジクロルメタン等が、また塗
工液に含まれる溶剤としてはテトラヒドロフラン等が使
用されており、ジクロルメタンには溶解され難いが、テ
トラヒドロフランには溶解され易い樹脂、可塑剤等が存
在するため、塗工液中に１０秒以上浸漬することにより
、これらの樹脂、可塑剤等が完全に溶解されるものと思
われる。In addition, the reason for the reduction in the formation of streaks on the surface of the photoreceptor is that foreign substances such as resin and plasticizer that remain attached to the drum surface without being removed during the cleaning process are dissolved in the solvent contained in the coating solution. It is believed that the particles were sufficiently dissolved in the solvent and were thus washed. Usually, dichloromethane or the like is used as a cleaning solvent in the drum cleaning process, and tetrahydrofuran or the like is used as a solvent in the coating liquid. Since these resins, plasticizers, etc. are present, it is thought that these resins, plasticizers, etc. are completely dissolved by immersion in the coating liquid for 10 seconds or more.
ドラムの塗工液への浸漬時間が１０秒未満の場合には、
上述のようにドラム上下部での感光層の膜厚が均一とな
らず、また樹脂、可塑剤等の溶解も完全に行われない。If the drum is immersed in the coating solution for less than 10 seconds,
As mentioned above, the thickness of the photosensitive layer on the upper and lower parts of the drum is not uniform, and the resin, plasticizer, etc. are not completely dissolved.
一方、６０秒を超えると、上記効果の向上がほとんど見
られず、生産性が低下すると共に、液面付近の塗工液が
よどみによって高濃度となり、ドラムの上端近傍の感光
層の膜厚が厚くなる。尚、溶剤としてテトラヒドロフラ
ンを用いた場合、浸漬時間の最適値は約３０秒である。On the other hand, if the time exceeds 60 seconds, there is little improvement in the above effects, productivity decreases, and the coating liquid near the liquid surface becomes highly concentrated due to stagnation, resulting in a decrease in the thickness of the photosensitive layer near the top of the drum. It gets thicker. In addition, when tetrahydrofuran is used as a solvent, the optimum value of the immersion time is about 30 seconds.
（実施例） 次に、本発明を実施例に基づいて具体的に説明する。(Example) Next, the present invention will be specifically explained based on examples.
長さ２５０ｍｍのアルミニウム製ドラム素管を感光体用
塗工液が収容されたタンクの上方に配置し、ドラム素管
をタンク内へ浸漬して、下記に示す所定時間停止した後
、タンクから引き上げ、次に塗工液を乾燥して感光体を
得た。尚、塗工液の溶剤としてはテトラヒドロフラン（
沸点６６℃）を用いた。Place an aluminum drum tube with a length of 250 mm above the tank containing the photoconductor coating liquid, immerse the drum tube into the tank, and after stopping for the specified time shown below, pull it out of the tank. Then, the coating solution was dried to obtain a photoreceptor. In addition, tetrahydrofuran (
(boiling point 66°C) was used.
得られた感光体の上下部の膜厚を測定してその差を表１
に示す。また、感光体の画像の欠点を測定してそのパー
セントを表１にまとめて示す。The film thicknesses of the upper and lower parts of the obtained photoconductor were measured and the difference was shown in Table 1.
Shown below. Further, defects in the image of the photoreceptor were measured and the percentages thereof are summarized in Table 1.
表 １
表１の結果から、塗工液中での停止時間が長くなるにつ
れて、感光層の上下部の膜厚差が小さくなり、かつ画像
欠点が減少することが確認された。Table 1 From the results in Table 1, it was confirmed that as the suspension time in the coating liquid increased, the difference in film thickness between the upper and lower parts of the photosensitive layer became smaller and the image defects decreased.
（発明の効果）
本発明によれば、ドラムの塗工液への浸漬時間を１０〜
６０秒とすることにより、感光体の周面に筋が発生する
のを防止でき、しかも感光層の膜厚のばらつきを減少す
ることができ、歩留まりを向上し、画像品質の優れた感
光体を得ることができる。(Effects of the Invention) According to the present invention, the immersion time of the drum in the coating liquid is 10 to
By setting the time to 60 seconds, it is possible to prevent streaks from occurring on the circumferential surface of the photoreceptor, and also to reduce variations in the film thickness of the photoreceptor layer, improving yields and producing photoreceptors with excellent image quality. Obtainable.
Claims (1)
体を塗工液に１０〜６０秒間浸漬し、次いでドラムを塗
工液より取り出すことを特徴とするドラム塗工方法。 ２、前記塗工液に含まれる溶剤の沸点は７０℃以下であ
る請求項１記載のドラム塗工方法。[Claims] 1. A drum characterized in that a cylindrical drum is arranged vertically, the entire drum is immersed in a coating liquid for 10 to 60 seconds, and then the drum is taken out from the coating liquid. Coating method. 2. The drum coating method according to claim 1, wherein the boiling point of the solvent contained in the coating liquid is 70°C or lower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19717889A JPH0359670A (en) | 1989-07-28 | 1989-07-28 | Drum coating method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19717889A JPH0359670A (en) | 1989-07-28 | 1989-07-28 | Drum coating method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0359670A true JPH0359670A (en) | 1991-03-14 |
Family
ID=16370102
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19717889A Pending JPH0359670A (en) | 1989-07-28 | 1989-07-28 | Drum coating method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0359670A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0889880A (en) * | 1994-09-22 | 1996-04-09 | Bando Chem Ind Ltd | Immersion coating method |
-
1989
- 1989-07-28 JP JP19717889A patent/JPH0359670A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0889880A (en) * | 1994-09-22 | 1996-04-09 | Bando Chem Ind Ltd | Immersion coating method |
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