JPH11606A - Method for forming coat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a spiral mark, the marring of a lower layer and the generation of a bubble in the process to smooth a coat by rubbing from appearing and thereby, enable the formation of the coat with a smooth and uniform surface by providing a curved face with a specified curvature in a direction in which a smoothing member runs and an orthogonal direction with the described direction. SOLUTION: A coating liquid discharged to an object 1 to be coated generates a pool on the peripheral edge of a contact point in a smoothing member 20. However, the coating liquid finding its way into the downstream side of the contact point in the pool by the discharge of the coating liquid moves to the object 1 side to be separated from the pool and entrain the object 1, because a gap between the smoothing member 20 and the object 1 becomes wider by the curvature of the smoothing member 20 and the curvature of the object 1, resulting in the deterioration of a liquid retaining force under the effects of surface tension. Thus, the coating liquid settles on the object 1. In this case, the coating liquid advancing to the peripheral edge of the pool shows a deteriorated liquid retaining force and entrains the object 1 even on both sides of the smoothing member 20, i.e., on both sides in the axial direction of the object 1 as the gap between the smoothing member 20 and the object 1 becomes wider on account of the curvature of the smoothing member 20.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は、塗膜の形成方法に
関するものであり、更に詳しくは、塗液吐出ノズル及び
平滑化部材を用いて塗液を塗布する方法において、平滑
化部材の走行方向およびそれに直交する方向に湾曲せし
めた平滑化部材を用いることによって塗り跡がなく平滑
な塗膜面を形成し得る塗膜形成方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a coating film, and more particularly, to a method for applying a coating liquid using a coating liquid discharge nozzle and a smoothing member. Further, the present invention relates to a coating film forming method capable of forming a smooth coating film surface without a coating mark by using a smoothing member curved in a direction perpendicular to the coating film.

【０００２】[0002]

【従来の技術】従来、円筒状、円柱状または平板状など
の基体表面に塗膜を形成する方法の一つとしてノズル塗
布方法が知られている。ノズル塗布方法を円筒状または
円柱状の被塗布物に適用する場合は、被塗布物を水平に
支持して回転させながら、塗液の吐出ノズルを被塗布物
に近接させて被塗布面上を周方向に走行させると共に軸
方向に移動させることによって塗液が被塗布物周面に塗
布される。また、平板状の被塗布物に適用する場合は被
塗布物とノズルとを相対的にＸ−Ｙ方向に移動させ、そ
の表面に塗液を供給し、塗液の流動性を利用して塗膜の
形成が行なわれている。2. Description of the Related Art Conventionally, a nozzle coating method has been known as one of methods for forming a coating film on a substrate surface such as a cylindrical, cylindrical or flat plate. When applying the nozzle coating method to a cylindrical or cylindrical object to be coated, the nozzle for applying the coating liquid is brought close to the object to be coated while the object is horizontally supported and rotated, and the surface of the object is coated. The coating liquid is applied to the peripheral surface of the workpiece by moving in the circumferential direction and moving in the axial direction. When applying to a flat object to be coated, the object and the nozzle are relatively moved in the X and Y directions, the coating liquid is supplied to the surface thereof, and the coating liquid is applied using the fluidity of the coating liquid. A film is being formed.

【０００３】しかしながら、従来のノズル塗布方法にお
ける塗膜の平滑化は、塗液と被塗布物との親和性や塗液
の流動性に依存するものであり、精度の高い制御は困難
であった。また、空気の噴出流をスパイラル状に塗着し
た液に吹き付けたり（特開昭５９−１９６７８１号公報
参照）、塗液を勢いよくノズルから吐出させて飛翔エネ
ルギーを利用（例えば特公平５−６７３４５号公報参
照）する方法があるが、溶媒型塗液を使用した場合は、
被塗布物表面の塗液の乾燥速度が速かったりあるいは飛
翔エネルギーの最適値が求め難かったりして、塗膜の形
成は困難であった。[0003] However, the smoothing of the coating film in the conventional nozzle coating method depends on the affinity between the coating liquid and the object to be coated and the fluidity of the coating liquid, and it is difficult to control with high precision. . Further, a jet flow of air is sprayed on a spirally applied liquid (see Japanese Patent Application Laid-Open No. 59-196781), or the coating liquid is vigorously discharged from a nozzle to utilize flying energy (for example, Japanese Patent Publication No. 5-67345). No.), but when using a solvent type coating solution,
It was difficult to form a coating film because the drying speed of the coating liquid on the surface of the coating material was high or the optimum value of the flying energy was difficult to obtain.

【０００４】さらにノズルと別に設けた塗膜表面形成部
材で塗着面をこすり、平滑化する方法も提案されている
（例えば特開昭５０−９０４０４号公報参照）が、塗布
空間を解放して被塗布物に液滴状に塗着させる場合は極
く小さな凹凸が表面に残るのを完全に防止することは困
難であり、連続して紐状に塗着した場合でも個別にブレ
ードを設けて塗り広げる方法では安定して平滑化するこ
とは容易ではなかった。Further, a method has been proposed in which a coating surface is rubbed and smoothed with a coating film surface forming member provided separately from a nozzle (see, for example, JP-A-50-90404). It is difficult to completely prevent very small irregularities from remaining on the surface when applying in the form of droplets to the object to be coated. It was not easy to stably smooth the surface by the method of spreading.

【０００５】また、特開平３−１９３１６１に開示され
たノズル塗布ではノズルと被塗布物との距離が５０〜１
００μｍ程度に極めて近接しているときは、吐出された
塗液はノズルと被塗布物との相対的な移動に基づいて被
塗布面にスムーズに移行して比較的平滑な塗膜を得るこ
とができるが、ノズル先端と被塗布面との間隙がノズル
径に対して大きくなるとノズル開口部に液滴の滞留現象
が生じ被塗布物への移行が間欠的となる。In the nozzle coating disclosed in JP-A-3-193161, the distance between the nozzle and the object to be coated is 50 to 1.
When the coating liquid is extremely close to about 00 μm, the discharged coating liquid can smoothly move to the surface to be coated based on the relative movement between the nozzle and the object to obtain a relatively smooth coating film. However, if the gap between the tip of the nozzle and the surface to be coated is larger than the diameter of the nozzle, a droplet stagnation phenomenon occurs at the nozzle opening, and the transfer to the object to be coated becomes intermittent.

【０００６】上述したようにこの場合は、ブレードでこ
すって平滑化を行っても凹凸は解消せず、例えば浸漬塗
布と比較すると著しく粗い表面となる。このため、被塗
布物とノズルとの距離を、両者の衝突を起こさずかつ一
定値以内に保つ必要が生じ、このためにはオートフォー
カス機構を取り入れて、測定値に基づきノズルの位置を
上下させるか、あるいはノズルとの距離変動が起こらな
いように精度のよい被塗布物の搬送系を作らなければな
らず、これらは費用を要するという問題がある。As described above, in this case, even if the surface is smoothed by rubbing with a blade, the unevenness does not disappear, and for example, the surface becomes extremely rough as compared with dip coating. For this reason, it is necessary to keep the distance between the object to be coated and the nozzle within a certain value without causing collision between the object and the nozzle. For this purpose, an autofocus mechanism is adopted to move the nozzle up and down based on the measured value. Alternatively, it is necessary to make a system for transporting the object with high accuracy so that the distance from the nozzle does not fluctuate.

【０００７】上記事情に鑑みて、本発明者は、特願平６
−１０１２８９号において、被塗布物表面に達する塗液
誘導部材をノズル開口部に設けることにより、被塗布物
に対するノズルの位置精度の要求を緩和し、塗液の連続
塗出・塗膜の平滑化を可能とする塗布方法を提供した。
しかしながら、上記塗布方法を用いても、塗液の溶媒が
特に低沸点（１００℃以下）である場合には、塗液が被
塗布物表面に達するまでの間の溶媒蒸発が避けられず、
濃縮された塗液を薄めるために専用の溶媒供給管を設け
る等の工夫が必要であった。[0007] In view of the above circumstances, the present inventor disclosed in Japanese Patent Application No.
In JP-A-10-101289, by providing a coating liquid guiding member reaching the surface of the coating object at the nozzle opening, the requirement of the positional accuracy of the nozzle with respect to the coating object is relaxed, and the continuous application of the coating liquid and the smoothing of the coating film are performed. And a coating method enabling the application.
However, even when the above-described coating method is used, when the solvent of the coating liquid has a particularly low boiling point (100 ° C. or lower), evaporation of the solvent until the coating liquid reaches the surface of the object to be coated cannot be avoided.
In order to dilute the concentrated coating solution, a device such as providing a dedicated solvent supply pipe was required.

【０００８】さらに本発明者は、先に塗液の導通部材の
端部に平滑化機能をもたせることにより、ノズル開口部
と被塗布物との距離の精度が悪くても連続した塗着を得
ることができ、塗着と同時に平滑化も行い均一な塗膜を
得る塗布方法および装置を提供した（特願平７−４７１
７２）。上記の塗布方法を例えば水平回転保持された円
筒状被塗布物に適用すると、塗液の粘度、ウェット膜
厚、被塗布物の回転数、平滑化部材の被塗布物との接触
位置、平滑化部材の押し付け力などを適当に選べば、浸
漬塗布を行った場合に近い乾燥塗膜を得ることが可能で
ある。しかし平滑化部材で塗膜をこすって平滑化する方
法の本質として、塗液が平滑化部材を離れるときの跡す
なわちスパイラル跡と、塗り重ねをする場合の下層の損
傷、そして空気巻き込みによる泡の発生の問題が生じ
る。Further, the inventor of the present invention obtains a continuous coating even if the accuracy of the distance between the nozzle opening and the object to be coated is poor by first providing the end of the coating liquid conducting member with a smoothing function. And a coating method and apparatus for obtaining a uniform coating by performing smoothing simultaneously with coating (Japanese Patent Application No. 7-471).
72). When the above-mentioned coating method is applied to, for example, a cylindrical workpiece to be horizontally rotated and held, the viscosity of the coating liquid, the wet film thickness, the number of rotations of the workpiece, the contact position of the smoothing member with the workpiece, the smoothing If the pressing force of the member is appropriately selected, it is possible to obtain a dried coating film close to that obtained by dip coating. However, the essence of the method of smoothing the coating film by rubbing the coating with the smoothing member is as follows: traces when the coating liquid leaves the smoothing member, that is, spiral traces, damage to the lower layer when re-coating, and foaming due to air entrapment. A problem arises.

【０００９】下層損傷は下層の膜構成分が上層塗液の溶
媒に溶ける場合に発生しやすくなる。また塗り重ねで
は、下層塗布後下層の溶媒を十分除去しないまま上層を
塗布する要請がしばしば起こる。この場合は、非常に損
傷が起きやすく、特に問題となる。Lower layer damage is more likely to occur when the lower layer film component is dissolved in the solvent of the upper layer coating solution. In the case of recoating, there is often a demand for applying the upper layer without sufficiently removing the solvent of the lower layer after applying the lower layer. In this case, damage is very likely to occur, which is particularly problematic.

【００１０】[0010]

【発明が解決しようとする課題】本発明は上記問題を解
決するものであり、塗膜をこすって平滑化するときに発
生するスパイラル跡、下層損傷、泡発生を防止し、表面
が平滑で均一な塗膜を形成する方法を提供することにあ
る。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and prevents a spiral trace, damage to a lower layer and generation of bubbles which occur when a coating film is rubbed and smoothed, and has a smooth and uniform surface. It is an object of the present invention to provide a method for forming a coating film.

【００１１】[0011]

【課題を解決するための手段】本発明はかかる課題を解
決するために鋭意検討を行った結果なされたもので、塗
液吐出ノズル端部に平滑化部材を設け、該平滑化部材を
被塗布物に弾性的に当接せしめて被塗布面上を相対的に
走行させることにより塗液供給ノズルから吐出される塗
液を塗り広げて塗膜を平滑化する塗膜形成方法におい
て、該平滑化部材が走行する方向とそれに直交する方向
に所定の曲率を持つ湾曲面を有することを特徴とする塗
膜形成方法を提供するものである。SUMMARY OF THE INVENTION The present invention has been made as a result of intensive studies in order to solve the above-mentioned problems. A smoothing member is provided at an end of a coating liquid discharge nozzle, and the smoothing member is coated. A coating solution ejected from a coating solution supply nozzle to spread the coating solution by making the coating material elastically contact the object and relatively running on the surface to be coated, thereby smoothing the coating film. It is an object of the present invention to provide a method for forming a coating film, which has a curved surface having a predetermined curvature in a direction in which a member travels and a direction perpendicular to the traveling direction.

【００１２】[0012]

【発明の実施の形態】以下、円筒状または円柱状物体に
塗布する場合を例に、本発明を詳細に説明する。図１
に、本発明の塗布方法を実施する塗布装置の一例とし
て、電子写真感光体の製造方法に利用する場合について
説明図を示す。図１に示す塗布装置は、円筒状または円
柱状の被塗布物基体を水平に支持して回転させる駆動機
構と、被塗布物の軸方向に移動しつつ被塗布物の表面に
塗液を供給する塗液供給機構とから構成されている。BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below in detail by taking as an example the case of applying the composition to a cylindrical or cylindrical object. FIG.
FIG. 2 is an explanatory view showing a case where the present invention is applied to a method for manufacturing an electrophotographic photosensitive member as an example of a coating apparatus for performing the coating method of the present invention. The coating apparatus shown in FIG. 1 includes a driving mechanism that horizontally supports and rotates a cylindrical or columnar substrate, and supplies a coating liquid to the surface of the substrate while moving in the axial direction of the substrate. And a coating liquid supply mechanism.

【００１３】被塗布物１としては、特に限定されること
はなく、電子写真感光体の基体の場合、ガラス管、アル
ミ切削管、アルミしごき管、樹脂管、紙管等またはこれ
らの管に下地塗布、下地処理を施した管あるいは電子写
真感光体の再生管等が使用される。駆動機構は、所定の
間隔を設けて左右に垂直に配置された軸受け付き支持プ
レート２，２、各支持プレートの上部にそれぞれ設けら
れた軸受けを介して水平に配置された回転軸３，３、一
方の回転軸に固定されたギヤ４、減速用ギヤ内蔵駆動モ
ーター５、モーター５の回転をギヤ４に伝達するタイミ
ングベルト６から構成されている。The substrate 1 to be coated is not particularly limited. In the case of a substrate of an electrophotographic photosensitive member, a glass tube, an aluminum cutting tube, an aluminum ironing tube, a resin tube, a paper tube or the like, or a base material on these tubes. A tube that has been subjected to coating and undercoating or a reproduction tube of an electrophotographic photosensitive member is used. The driving mechanism is provided with support plates 2 and 2 with bearings arranged vertically at right and left at predetermined intervals, rotating shafts 3 and 3 horizontally arranged via bearings respectively provided on the upper portions of the support plates, It comprises a gear 4 fixed to one of the rotating shafts, a drive motor 5 with a built-in reduction gear, and a timing belt 6 for transmitting the rotation of the motor 5 to the gear 4.

【００１４】被塗布物１の回転は、被塗布物１の中心部
に回転軸３の嵌合孔を設け、あるいは被塗布物１の両端
に予め装着されたフランジ７，７によって行われる。す
なわち、円筒体の場合は、被塗布物１の両端にフランジ
７，７を装着した後、回転軸３，３の間に被塗布物１を
位置させて一方の回転軸を前進させ、フランジ７，７の
各中心部孔に、先端に内拡チャック（図示せず）の付い
た回転軸３，３を嵌合固定し、モーター５を駆動させて
被塗布物１を回転させる。フランジ７，７の装着は、フ
ランジの各中心孔で決定される被塗布物の軸芯が合うよ
うに行なわれる。The object 1 is rotated by providing a fitting hole for the rotating shaft 3 at the center of the object 1 or by flanges 7 mounted on both ends of the object 1 in advance. That is, in the case of a cylindrical body, after the flanges 7 are mounted on both ends of the object 1 to be coated, the object 1 is positioned between the rotating shafts 3 and 3 and one of the rotating shafts is moved forward, and , 7 are fitted and fixed with rotating shafts 3, 3 each having an inner expanding chuck (not shown) at the tip, and the motor 5 is driven to rotate the object 1. The mounting of the flanges 7, 7 is performed so that the axes of the objects to be coated determined by the respective center holes of the flanges are aligned.

【００１５】塗液供給機構は、所定の間隔を設けて左右
に垂直に配置された支持プレート８，８、各支持プレー
トの間に配置された２本の案内ロッド９，９、支持プレ
ート８，８の間であって案内ロッド９，９の間に配置さ
れかつ一端が支持プレート８から突出するスクリューネ
ジ１０とその端部に固設されたギヤ１１、駆動用モータ
ー１２、モーター１２の回転をギヤ１１に伝達するタイ
ミングベルト１３、その左右にそれぞれ設けられた案内
ロッド９の嵌合孔と当該嵌合孔の中央に設けられたスク
リューネジ１０を嵌合するボールネジの軸受部とを有す
る支持プレート８，８の間に配置された移動体１４、そ
の一端を移動体１４に固設しかつその先端のノズル部を
水平に配置された被塗布物１の表面に向けて配置された
塗液供給管１５、該塗液供給管１５の他端側に配置され
た塗液容器１６、該塗液供給管１５の途中に配置された
定量ポンプ１７から構成されている。The coating liquid supply mechanism includes support plates 8, 8 vertically arranged at right and left at predetermined intervals, two guide rods 9, 9 disposed between the support plates, and support plates 8, 9. 8, a screw screw 10 having one end protruding from the support plate 8 and a gear 11 fixed to the end, a driving motor 12, and rotation of the motor 12 A support plate having a timing belt 13 for transmission to the gear 11, a fitting hole for a guide rod 9 provided on each of the left and right sides thereof, and a ball screw bearing for fitting a screw screw 10 provided at the center of the fitting hole. A moving body 14 arranged between 8, 8 and a coating liquid supply having one end fixed to the moving body 14 and a nozzle portion at the end thereof facing the surface of the workpiece 1 horizontally arranged. Tube 15, Coating solution vessel 16 disposed on the other end side of the coating liquid supply pipe 15, and a metering pump 17 which is arranged in the middle of the coating liquid supply pipe 15.

【００１６】塗液供給機構から供給される塗液はポンプ
１７で吸引・吐出され、ヘッダー１９を経由した後、さ
らにノズル１８を経て吐出口から吐出される。ノズル１
８の先端部には塗液を擦って塗膜表面を平滑にするため
の平滑化部材２０が装着される。The coating liquid supplied from the coating liquid supply mechanism is sucked and discharged by a pump 17, passes through a header 19, and is further discharged from a discharge port through a nozzle 18. Nozzle 1
A smoothing member 20 for rubbing the coating liquid and smoothing the surface of the coating film is attached to the tip of 8.

【００１７】平滑化部材２０は、図２（ａ），（ｂ），
（ｃ）に示す。図２（ａ）は平滑化部材全体を示したも
のであり、図２（ｂ）は塗液を平滑化している様子を上
方から見た図であり、図２（ｃ）は同じ円筒状被塗布物
に適用した場合を該被塗布物の回転軸に直角に切断した
断面から見たものである。１は被塗布物、２１は、被塗
布物と当接する平滑化部材２０の弾性材料２２を固定す
る剛性材を示す。２３，２３はピアノ線を曲げたもので
あり、ピアノ線の弾性力を利用して平滑化部材２０全体
を柔軟にしかも確実に被塗布物１に当接することを目的
とする。ピアノ線２３は、平滑化部材２０を保持するた
めの保持部材２６に接続・固定されている。１８は塗液
供給管１５に連なるノズルであり、吐出ノズル１８の先
端はつば状に拡げられ、弾性材料２２に穴を設け、そこ
に埋め込まれ、弾性材から抜け出さないように、またノ
ズル１８先端から吐出された塗液がノズル１８と弾性材
料２２の穴の間から裏面側に流れ出ないように取り付け
られている。剛性材２１には弾性材２２と同じ位置に、
ノズル１８がやっと通る硬ばめ状の穴を設け、ノズル１
８の剛性材２１から突き出る長さを規定している。剛性
体２１はアルミニウム、鉄、銅などの塑性加工可能な剛
性材料なら何を用いてもよい。The smoothing member 20 is shown in FIGS.
It is shown in (c). FIG. 2A shows the entire smoothing member, FIG. 2B is a view of the state of smoothing the coating liquid viewed from above, and FIG. 2C is the same cylindrical cover. This is a view of a cross section taken at a right angle to a rotation axis of the object to be applied when applied to the object to be applied. Numeral 1 denotes an object to be coated, and 21 denotes a rigid material for fixing the elastic material 22 of the smoothing member 20 in contact with the object to be coated. Reference numerals 23 and 23 denote bent piano wires, which are intended to flexibly and surely abut the object 1 to be coated by using the elastic force of the piano wire. The piano wire 23 is connected and fixed to a holding member 26 for holding the smoothing member 20. Reference numeral 18 denotes a nozzle connected to the coating liquid supply pipe 15. The tip of the discharge nozzle 18 is expanded in a brim shape, a hole is provided in the elastic material 22, and the hole is buried therein so as not to fall out of the elastic material. It is attached so that the coating liquid discharged from the nozzle does not flow out to the back side from between the nozzle 18 and the hole of the elastic material 22. At the same position as the elastic material 22, the rigid material 21
A hard-fitted hole through which the nozzle 18 finally passes was provided.
8 protrudes from the rigid material 21. The rigid body 21 may be made of any rigid material such as aluminum, iron, and copper that can be plastically processed.

【００１８】これらの材料を塑性加工して図２（ｂ），
（ｃ）に示すように平滑化部材２０と被塗布物１とが相
対的に走行する方向およびそれと直角な方向とに所定の
曲率を持った面を形成する。弾性材料としては、ポリエ
チレン発泡体、ポリプロピレン発泡体、エチレンプロピ
レンゴム、クロロプレンゴムなどの１〜５ｍｍ厚さのシ
ートを前記した曲率をもった剛性材料面にほぼ同じ面積
で一体的に取り付け、弾性体シート面が剛性体２１の表
面と同じ曲率をもつようにする。こうすることにより、
平滑化部材の曲率を持つ部分から塗液が被塗布物１表面
に移行して塗着されることになり、塗膜表面にレベリン
グされずに残る平滑化部材のエッジ跡を小さくするとと
もに、被塗布物と接触している平滑化部材のノズル近傍
の面を常に塗液で安定的に満たすことにより、空気の巻
き込みをも防ぐことができる。These materials are subjected to plastic working, as shown in FIG.
As shown in (c), a surface having a predetermined curvature is formed in a direction in which the smoothing member 20 and the article 1 relatively travel and a direction perpendicular thereto. As the elastic material, a sheet having a thickness of 1 to 5 mm such as polyethylene foam, polypropylene foam, ethylene propylene rubber, chloroprene rubber or the like is integrally attached to the surface of the rigid material having the above-mentioned curvature in substantially the same area, The sheet surface has the same curvature as the surface of the rigid body 21. By doing this,
The coating liquid migrates from the portion having the curvature of the smoothing member to the surface of the object 1 to be coated, and the edge of the smoothing member remaining without being leveled on the surface of the coating film is reduced. By constantly filling the surface of the smoothing member in contact with the coating material near the nozzle with the coating liquid, air entrainment can be prevented.

【００１９】ピアノ線としては、０．５〜１．５ｍｍの
直径をもつものを用いる。ノズル１８の材料としては、
ピアノ線の弾性力を阻害しない耐溶剤性の軟らかい素材
を用いる。ポリエチレン、ポリプロピレン、３フッ化ポ
リエチレンなどで０．３〜１．５ｍｍ程度の肉厚をもっ
たチューブを用いるのがよい。A piano wire having a diameter of 0.5 to 1.5 mm is used. As a material of the nozzle 18,
Use a solvent-resistant soft material that does not impair the elasticity of the piano wire. It is preferable to use a tube made of polyethylene, polypropylene, trifluoride polyethylene or the like and having a thickness of about 0.3 to 1.5 mm.

【００２０】本発明によって、ノズル先端２４から吐出
する塗液が平滑化部材２０により平滑化される作用機能
は、その解釈によって本発明を制限するものではない
が、次の機構によって生じるものと考えられる。即ち、
ノズル端２４から吐出された塗液は、平滑化部材２０と
被塗布物１の接触部周縁に界面張力によって液溜りをつ
くり、塗液は平滑化部材２０の被塗布物１の接触部周縁
に滞溜される。従って、ノズル端２４から吐出された塗
液は、まず前記液溜まり部に導入され、それ以前に吐出
された液とプールされる。このとき、液溜まり量は、塗
液の粘度、界面張力などにより一定の大きさに保たれ、
ノズル端２４から吐出された液量に見合う分が、被塗布
物１表面に移行して被塗布物１の回転に伴って液溜りか
ら分れて被塗布物１に随伴することによって塗着される
こととなる。According to the present invention, the function of smoothing the coating liquid discharged from the nozzle tip 24 by the smoothing member 20 does not limit the present invention by its interpretation, but is considered to be caused by the following mechanism. Can be That is,
The coating liquid discharged from the nozzle end 24 forms a liquid pool due to interfacial tension at the periphery of the contact portion between the smoothing member 20 and the object 1, and the coating liquid is formed at the periphery of the contact portion of the smoothing member 20 with the object 1. It is accumulated. Therefore, the coating liquid discharged from the nozzle end 24 is first introduced into the liquid pool, and is pooled with the liquid discharged before that. At this time, the amount of liquid pool is maintained at a constant size due to the viscosity of the coating liquid, interfacial tension, etc.
An amount corresponding to the amount of liquid discharged from the nozzle end 24 is transferred to the surface of the object 1, separated from the liquid pool with the rotation of the object 1, and applied along with the object 1. The Rukoto.

【００２１】更に詳しく説明すると、被塗布物１に吐出
された塗液は、平滑化部材２０の接触点周縁に液溜りを
生じるが、塗液の吐出によって液溜りの接触点下流側に
進行した塗液は、平滑化部材２０の曲率と被塗布物１の
曲率によって平滑化部材２０と被塗布物１間の間隙が大
きくなり、表面張力による液保持力が低下するため塗液
は被塗布物１側に移行して液溜めから分離して被塗布物
１に随伴し、かくして被塗布物１に塗着されることとな
る。このとき、平滑化部材２０の両側、即ち、被塗布物
１の軸方向両側においても、液溜り周縁に進行した塗液
は、平滑化部材２０の曲率のために平滑化部材２０と被
塗布物１の間隙が拡大し、液保持力が低下するため塗液
は被塗布物１に随伴することとなる。More specifically, the coating liquid discharged onto the object to be coated 1 forms a liquid pool at the periphery of the contact point of the smoothing member 20, and the coating liquid is discharged to the downstream of the contact point of the liquid pool by discharging the coating liquid. Since the gap between the smoothing member 20 and the object 1 is increased by the curvature of the smoothing member 20 and the curvature of the object 1 to be applied, the liquid holding force is reduced due to surface tension. It moves to the first side, separates from the liquid reservoir, accompanies the object to be coated 1, and is thus applied to the object to be coated 1. At this time, on both sides of the smoothing member 20, that is, on both sides in the axial direction of the coating object 1, the coating liquid that has progressed to the periphery of the liquid pool is smoothed by the smoothing member 20 due to the curvature of the smoothing member 20. The coating liquid accompanies the workpiece 1 because the gap between the coating liquids 1 increases and the liquid holding power decreases.

【００２２】本発明は、上記の２つの膜形成が同時併行
的に行なわれるために塗膜のつくるスパイラル状の塗り
跡のない平滑な塗膜面が得られるものと判断される。従
って、平滑化部材２０が走行方向とそれに直交する方向
に所定の曲率をもつことが要求される。平滑化部材２０
の曲率は、被塗布物１が円筒体または円柱体であるとき
は、被塗布物１の軸方向の曲率が円筒体または円柱体の
曲率半径の０．０５〜３．０倍、好ましくは０．１〜
１．５倍の曲率半径とすることが望ましく、また、軸方
向に直交する方向には、円筒体または円柱体の曲率半径
の０．５〜３０倍、好ましくは１〜１０倍程度とされ
る。In the present invention, it is considered that since the above two film formations are performed simultaneously and simultaneously, a smooth coating surface without a spiral coating trace formed by the coating film can be obtained. Therefore, the smoothing member 20 is required to have a predetermined curvature in the traveling direction and the direction orthogonal thereto. Smoothing member 20
When the object 1 is a cylinder or a column, the curvature in the axial direction of the object 1 is 0.05 to 3.0 times the radius of curvature of the cylinder or the column, preferably 0. .1 to
The radius of curvature is desirably 1.5 times the radius of curvature, and in the direction perpendicular to the axial direction, is 0.5 to 30 times, preferably 1 to 10 times the radius of curvature of the cylindrical body or the cylindrical body. .

【００２３】また既に下地層塗布が行われている面にさ
らに平滑化部材２０によって塗布を行う場合、平滑化部
材２０の擦りにより下地を損傷させないため、該部材の
被塗布物当接面２２は軟らかい弾性体で構成することが
必要になる。この時平滑化部材が確実に被塗布物と当接
していないと、激しい振動が発生し、得られる塗膜面は
非常に乱れたものとなる。したがって当接にあたって
は、被塗布物表面に接触した位置からさらに２〜５ｍｍ
平滑化部材２０を保持する保持部材２６を被塗布物に押
しつける方向に移動させ、ピアノ線と平滑化部材との弾
性力で当接させることになる。In the case where the smoothing member 20 further applies the coating to the surface on which the underlayer coating has already been performed, the base contacting surface 22 of the member is not damaged by rubbing of the smoothing member 20. It must be made of a soft elastic body. At this time, if the smoothing member is not securely in contact with the object to be coated, severe vibration occurs, and the obtained coating film surface is extremely disturbed. Therefore, at the time of contact, it is 2 to 5 mm further from the position in contact with the surface of the object to be coated.
The holding member 26 holding the smoothing member 20 is moved in the direction of pressing the object to be coated, and the piano wire and the smoothing member are brought into contact with each other by the elastic force.

【００２４】この様にすると、当接面が被塗布物になら
って弾性的に変形し、当接面積が大となり、特に円周方
向に長くなって、液溜まりの液量が多くなる。この状態
になると、被塗布物１の回転による遠心力によって、液
溜まりの液が飛散しやすくなり塗出口２４から吐出され
た液の必ずしも全量が被塗布物１に塗着しない状況が発
生する。ゆえに平滑化部材２０を回転軸と直角の方向に
も一定の曲率となる面として、液溜まりの液量の増大を
防ぐことが要求される。この目的においても図２（ｃ）
に示したように被塗布物１の中心線に直交する方向に湾
曲した平滑化部材の形状となる。またこの様に曲率をも
って被塗布物との接触面を小さくすることは、摩擦帯電
を軽減する意味でも重要である。In this case, the contact surface is elastically deformed following the object to be coated, and the contact area becomes large, especially in the circumferential direction, so that the amount of liquid in the liquid pool increases. In this state, the liquid in the liquid pool tends to be scattered due to the centrifugal force caused by the rotation of the object 1, and a situation occurs in which the entire amount of the liquid discharged from the application outlet 24 is not necessarily applied to the object 1. Therefore, it is required that the smoothing member 20 be a surface having a constant curvature also in a direction perpendicular to the rotation axis to prevent an increase in the amount of liquid in the liquid pool. For this purpose, FIG.
As shown in (1), the shape of the smoothing member is curved in a direction orthogonal to the center line of the article 1 to be coated. It is also important to reduce the contact surface with the object to be coated with such a curvature from the viewpoint of reducing triboelectric charging.

【００２５】平滑化部材２０の剛性材２１を２方向に曲
率を持つ面に加工するには、ＮＣ旋盤を用いて要求され
る曲率面に仕上げることもできるが、パイプをＵベント
あるいはＬボー状に曲げて、その稜線部を切り出して使
うのが便利である。パイプとしては、例えば肉厚１〜３
ｍｍ、直径２０〜５０ｍｍのアルミ押し出し管を半径７
０〜２００ｍｍに曲げ、２５ｍｍ（曲率大の方向）×５
０ｍｍ（曲率小の方向）に切り出し、四隅にピアノ線を
差し込む穴を、中央にノズルを貫通させる穴を設けるこ
とによって得ることができる。In order to process the rigid material 21 of the smoothing member 20 into a surface having a curvature in two directions, it is possible to finish the surface to a required curvature by using an NC lathe. It is convenient to bend and cut out the ridge. As a pipe, for example, a wall thickness of 1 to 3
extruded aluminum tube with a diameter of 7 mm
Bending to 0 to 200 mm, 25 mm (direction of large curvature) x 5
It can be obtained by cutting out to 0 mm (in the direction of small curvature) and providing holes at four corners for inserting a piano wire and holes at the center for penetrating the nozzle.

【００２６】平滑化部材２０の弾性材２２は全体を導電
化するか、あるいはその表面を導電化することが望まし
い。全体を導電化するには、弾性体に導電性顔料を練り
こんで形成すればよいし、表面だけを導電化するには例
えば導電性ポリエチレンシートを非導電性の発泡ポリエ
チレンにラミネートすればよい。またノズル１８も導電
性ポリエチレンチューブなどで導電化するのがよい。It is desirable that the elastic member 22 of the smoothing member 20 be made conductive as a whole or the surface thereof be made conductive. The whole may be made conductive by kneading a conductive pigment into an elastic body, and only the surface may be made conductive by, for example, laminating a conductive polyethylene sheet with non-conductive foamed polyethylene. The nozzle 18 is also preferably made conductive with a conductive polyethylene tube or the like.

【００２７】既に発明者等が提案しているように上記ノ
ズル１８および／または平滑化部材２０を電気的に接地
したり、ノズル１８および／または平滑化部材２０を周
囲から電気的に絶縁して取り付けた上で電源３０、高抵
抗３１及びワニ口クリップを介して塗液が流動・摩擦に
よって示す帯電と逆の符号の電圧を印加して、塗液の帯
電を除去、中和、逆帯電させながら塗布することもでき
る。また非導電性ポリエチレンチューブに、図２（Ａ）
に示すように電極２５を直接導入し、これに図１に示す
ワニ口クリップ３２、高抵抗３１、電源３０を介して電
圧を印加することもできる。印加する電位の電圧は特に
制限されるものではないが±０．２〜１０ｋＶ程度であ
る。As already proposed by the inventors, the nozzle 18 and / or the smoothing member 20 are electrically grounded, or the nozzle 18 and / or the smoothing member 20 are electrically insulated from the surroundings. After being attached, the coating liquid is applied with a voltage having a sign opposite to the charge indicated by the flow and friction through the power supply 30, the high resistance 31, and the alligator clip to remove, neutralize, and reversely charge the coating liquid. It can be applied while being applied. FIG. 2 (A) shows a non-conductive polyethylene tube.
As shown in FIG. 1, the electrode 25 can be directly introduced, and a voltage can be applied to the electrode 25 via the alligator clip 32, the high resistance 31, and the power supply 30 shown in FIG. The voltage of the applied potential is not particularly limited, but is about ± 0.2 to 10 kV.

【００２８】本発明による塗布方法は次のように行われ
る。すなわち、駆動機構により被塗布物１を水平に支持
して回転させつつ、塗液供給機構により、塗液容器１６
内塗液を塗液供給管１５を介してノズル１８より被塗布
物１の表面に吐出する。ノズル１８は、被塗布物１の回
転によって、被塗布物１表面を円周方向に走行すると共
にスクリューネジ１０の回転によって移動体１４が横方
向に移動し、それに伴って被塗布物１の軸方向に移動す
る。吐出された塗液は、平滑化部材２０と被塗布物１と
の接触部で液溜りを形成して滞留するが、塗液の吐出に
伴い平滑化部材２０の横方向移動と被塗布物の回転によ
り、液溜りの塗液が被塗布物１に移行して被塗布物１に
随伴し塗布される。The coating method according to the present invention is performed as follows. That is, while the object 1 is horizontally supported and rotated by the driving mechanism, the coating liquid container 16 is rotated by the coating liquid supply mechanism.
The inner coating liquid is discharged from the nozzle 18 to the surface of the object 1 through the coating liquid supply pipe 15. The nozzle 18 rotates in the circumferential direction on the surface of the object 1 by the rotation of the object 1, and the moving body 14 moves in the lateral direction by the rotation of the screw screw 10. Move in the direction. The discharged coating liquid forms a liquid pool at the contact portion between the smoothing member 20 and the workpiece 1 and stays there. However, with the discharge of the coating liquid, the smoothing member 20 moves laterally, and Due to the rotation, the coating liquid in the liquid pool moves to the object 1 to be applied and accompanies the object 1.

【００２９】塗布された塗液は、好ましい態様において
は、それぞれの電極からの電圧の作用を受けながら塗液
が拡げられて平滑化される。特に回転速度、液粘度、塗
液供給量、電圧印加等が適切に調整されれば、平滑化さ
れた液は通常の固定化手段で硬化され、均一な膜が形成
される。固定化手段としては、溶媒蒸発型の塗液の場合
は風乾、硬化型樹脂を用いた塗液の場合は樹脂に適した
加熱、紫外線照射等を挙げることができる。平板状被塗
布物の場合も同じように平滑化部材と被塗布物とを相対
的に移動して塗布を行う。In a preferred embodiment, the applied coating liquid is spread and smoothed while receiving the action of the voltage from each electrode. In particular, if the rotation speed, the liquid viscosity, the supply amount of the coating liquid, the voltage application, and the like are appropriately adjusted, the smoothed liquid is cured by the usual fixing means, and a uniform film is formed. Examples of the fixing means include air drying in the case of a solvent evaporation type coating liquid, and heating and ultraviolet irradiation suitable for the resin in the case of a coating liquid using a curable resin. Similarly, in the case of a flat object to be coated, coating is performed by relatively moving the smoothing member and the object to be coated.

【００３０】[0030]

【実施例】以下、実施例により本発明をさらに詳細に説
明するが、本発明はその要旨を超えない限り以下の実施
例に限定されるものではない。実施例において塗液供給
機構としては、定量ポンプ１７の吐出側に塗液供給管１
５を継ぎ、該管の他端をヘッダー１９に連結した。ヘッ
ダーには直接可撓性のノズル１８を取り付けた。EXAMPLES The present invention will be described in more detail with reference to the following Examples, which should not be construed as limiting the scope of the present invention. In the embodiment, the coating liquid supply mechanism includes a coating liquid supply pipe 1 on the discharge side of the metering pump 17.
5 and the other end of the tube was connected to the header 19. A flexible nozzle 18 was directly attached to the header.

【００３１】（実施例１）本実施例は図２に示した平滑
化部材を用いた例である。アルミ切削管（外径８０．０
ｍｍ、印ろう部内径７８．５ｍｍ、長さ３４０ｍｍ）に
フランジを装着し、フランジ孔に被塗布物回転機構の内
拡コレットチャックを挿入し把持した。被塗布物回転機
構のギヤモーターを駆動して、アルミ切削管１を２００
ｒｐｍで回転させた。(Embodiment 1) This embodiment is an example using the smoothing member shown in FIG. Aluminum cutting tube (outer diameter 80.0
mm, inner diameter of the seal part 78.5 mm, length 340 mm), a flange was mounted, and an inner collet chuck of the rotation mechanism of the coated object was inserted into the flange hole and gripped. By driving the gear motor of the rotation mechanism of the coated object, the aluminum cutting tube 1
Rotated at rpm.

【００３２】平滑化部材２０として、外形３０ｍｍ、厚
さ２ｍｍのアルミ管を半径１２０ｍｍでＵベントに曲
げ、この稜線部を長さ５０ｍｍ、幅２５ｍｍに切り出
し、これに厚さ４０μｍの導電性ポリエチレンシートを
ラミネートした厚さ３ｍｍ、発泡倍率２５倍の非導電性
発泡ポリエチレンシートを略同じ面積で融着したものを
用いた。平滑化部材の中央にノズル貫通用の穴を開け、
ノズルとして可撓性の導電性ポリエチレンチューブ（内
径１ｍｍ、外径２ｍｍ）の先端につばをつけ、弾性平滑
化部材と剛性材２１とを貫通して取り付けた。導電性ポ
リエチレンはテフロン継き手を介して塗液供給パイプに
接続した。ヘッダー１９は、ヘッダーを下降させたとき
平滑化部材２０の吐出口側が水平から６０°位の位置で
アルミ切削管と接触するようにセットした。As a smoothing member 20, an aluminum pipe having an outer diameter of 30 mm and a thickness of 2 mm is bent into a U-bent with a radius of 120 mm, and the ridge is cut out to a length of 50 mm and a width of 25 mm. And a non-conductive foamed polyethylene sheet having a thickness of 3 mm and a foaming ratio of 25 times fused together in substantially the same area was used. Drill a hole for nozzle penetration in the center of the smoothing member,
A brim was attached to the tip of a flexible conductive polyethylene tube (inner diameter 1 mm, outer diameter 2 mm) as a nozzle, and the elastic smoothing member and the rigid member 21 were penetrated and attached. The conductive polyethylene was connected to the coating liquid supply pipe via a Teflon joint. The header 19 was set such that when the header was lowered, the discharge port side of the smoothing member 20 was in contact with the aluminum cutting tube at a position about 60 ° from the horizontal.

【００３３】一方、下記の一般式（Ａ）に示すオキシチ
タニウムフタロシアニン１０重量部に、ｎ−プロパノー
ル２００重量部を加え、サンドグラインドミルで１０時
間粉砕、分散処理を行い、次にポリビニルブチラール
（電気化学工業（株）製デンカブチラール＃−６０００
Ｃ）５重量部の１０％メタノール溶液と混合し電子写真
感光体電荷発生層用分散液を得た。この分散液を使用
し、ウェット膜厚２０μｍとなるようにギヤポンプを運
転した。平滑化部材はアルミ切削管１回転０．６ｍｍピ
ッチになるように軸方向に移動させた。導電性ポリエチ
レンチューブには−４ｋＶの電圧を印加した。風乾後の
塗膜は一様な色調を示し浸漬塗布で得られたサンプルと
同様、塗膜厚さは均一であった。On the other hand, 200 parts by weight of n-propanol was added to 10 parts by weight of oxytitanium phthalocyanine represented by the following general formula (A), and the mixture was pulverized and dispersed by a sand grind mill for 10 hours. Denka Butyral # -6000 manufactured by Chemical Industry Co., Ltd.
C) 5 parts by weight of a 10% methanol solution was mixed to obtain a dispersion for an electrophotographic photoreceptor charge generation layer. Using this dispersion, a gear pump was operated so that the wet film thickness became 20 μm. The smoothing member was moved in the axial direction so as to make a pitch of 0.6 mm per rotation of the aluminum cutting tube. A voltage of -4 kV was applied to the conductive polyethylene tube. The coating film after air drying showed a uniform color tone, and the coating film thickness was uniform, similarly to the sample obtained by dip coating.

【００３４】[0034]

【化１】 Embedded image

【００３５】（式中Ｘはハロゲン原子をあらわし、ｎは
０から１までの数を表す） （実施例２）下記の式（１）に示すヒドラゾン化合物５
６重量部、(Wherein X represents a halogen atom and n represents a number from 0 to 1). (Example 2) A hydrazone compound 5 represented by the following formula (1)
6 parts by weight,

【００３６】[0036]

【化２】 Embedded image

【００３７】下記の式（２）に示すヒドラゾン化合物１
４重量部、The hydrazone compound 1 represented by the following formula (2)
4 parts by weight,

【００３８】[0038]

【化３】 Embedded image

【００３９】下記の式（３）に示すシアノ化合物１．５
重量部、The cyano compound 1.5 represented by the following formula (3)
Parts by weight,

【００４０】[0040]

【化４】 Embedded image

【００４１】及びポリカーボネート樹脂（三菱化学
（株）ノバレックス７０３０Ａ）１００重量部を１，４
−ジオキサン５００重量部及びテトラヒドロフラン５０
０重量部の混合溶媒に溶解させた電子写真感光体電荷輸
送層用の塗布液を得た。この塗布液を、ウェット膜厚１
００μｍとなるようにポリエチレンパイプから吐出させ
た。ポリエチレンパイプは１回転１．０ｍｍピッチとな
るようにアルミ管軸方向に移動した。アルミ管の回転数
は３００ｒｐｍとした。And 100 parts by weight of a polycarbonate resin (NOVAREX 7030A, Mitsubishi Chemical Corporation)
-500 parts by weight of dioxane and 50 of tetrahydrofuran
A coating solution for an electrophotographic photoreceptor charge transport layer dissolved in 0 parts by weight of a mixed solvent was obtained. This coating solution was applied to wet film 1
It was discharged from a polyethylene pipe so as to have a thickness of 00 μm. The polyethylene pipe was moved in the axial direction of the aluminum pipe so as to make a 1.0 mm pitch per rotation. The rotation speed of the aluminum tube was 300 rpm.

【００４２】ポリエチレンパイプに挿入した電極には−
１ｋＶの電圧を５０ＭΩの抵抗を介して印加した。塗布
後、１２５℃、３０分乾燥し、塗膜表面粗さを測定した
ところ、Ｒmax ＝０．３μｍであった。膜厚は、１９．
７〜２０．３μｍの範囲にあり均一な塗膜が得られた。
サンプルに塗布を数回繰り返したが、未使用時に塗布に
使用している溶媒中に平滑化部材と一緒にポリエチレン
パイプを短時間浸漬保持し、その後溶媒蒸気中に保て
ば、詰まりや汚れもほとんどなかった。The electrode inserted into the polyethylene pipe
A voltage of 1 kV was applied via a 50 MΩ resistor. After the coating, the coating was dried at 125 ° C. for 30 minutes, and the surface roughness of the coating film was measured to be Rmax = 0.3 μm. The film thickness is 19.
A uniform coating film having a thickness in the range of 7 to 20.3 μm was obtained.
The coating was repeated several times on the sample, but if not used, the polyethylene pipe was immersed for a short time together with the smoothing member in the solvent used for coating, and then kept in the solvent vapor to prevent clogging and dirt. Almost never.

【００４３】（比較例１）実施例１に対し図３に示すよ
うに基材の軸方向にのみ曲率をもつ（図２における
（ｂ）の方向に曲率があって、（ｃ）の方向には曲率は
ない）平滑化部材を使ったこと以外は、同一条件で行っ
た。電極に−４ｋＶの電圧を印加したが、風乾後の塗膜
は帯電によると思われるムラが見られた。(Comparative Example 1) Unlike Example 1, as shown in FIG. 3, it has a curvature only in the axial direction of the substrate (there is a curvature in the direction of (b) in FIG. 2 and a curvature in the direction of (c) in FIG. (There is no curvature). The same conditions were used except that a smoothing member was used. When a voltage of -4 kV was applied to the electrode, the coating film after air-drying exhibited unevenness presumably due to charging.

【００４４】（比較例２）図３に示す平滑化部材を使っ
た以外は実施例２と同じ条件で塗布を行った。塗布・乾
燥後の表面粗さはＲmax ＝０．９μｍでイエローランプ
下の目視でも、平滑化部材の移動跡が見られた。Comparative Example 2 Coating was performed under the same conditions as in Example 2 except that the smoothing member shown in FIG. 3 was used. The surface roughness after coating / drying was Rmax = 0.9 μm, and traces of movement of the smoothing member were observed even under a yellow lamp.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明方法を実施する装置の一例を示す斜視
図。FIG. 1 is a perspective view showing an example of an apparatus for performing the method of the present invention.

【図２】平滑化部材を示す図で、（ａ）は全体斜視図、
（ｂ）は横断面図、（ｃ）は縦断面図である。FIG. 2 is a view showing a smoothing member, (a) is an overall perspective view,
(B) is a transverse sectional view, and (c) is a longitudinal sectional view.

【図３】比較例１で用いた平滑化部材の斜視図。FIG. 3 is a perspective view of a smoothing member used in Comparative Example 1.

【符号の説明】[Explanation of symbols]

１ 被塗布物 １８ ノズル ２０ 平滑化部材 ２２ 弾性体 ２３ ピアノ線 ２５ 電極 ３０ 高圧電源 ３１ 高抵抗 DESCRIPTION OF SYMBOLS 1 Coated object 18 Nozzle 20 Smoothing member 22 Elastic body 23 Piano wire 25 Electrode 30 High voltage power supply 31 High resistance

Claims (5)

【特許請求の範囲】[Claims] 【請求項１】 塗液吐出ノズル端部に平滑化部材を設
け、該平滑化部材を被塗布物に弾性的に当接せしめて被
塗布面上を相対的に走行させることにより塗液供給ノズ
ルから吐出される塗液を塗り広げて塗膜を平滑化する塗
膜形成方法において、該平滑化部材が走行する方向とそ
れに直交する方向に所定の曲率を持つ湾曲面を有するこ
とを特徴とする塗膜形成方法。A coating liquid supply nozzle is provided by providing a smoothing member at an end of a coating liquid discharge nozzle, elastically abutting the smoothing member on an object to be coated, and relatively running on the surface to be coated. Coating method for smoothing a coating film by spreading a coating liquid discharged from the coating liquid, characterized by having a curved surface having a predetermined curvature in a direction in which the smoothing member travels and a direction orthogonal to the traveling direction. Coating method. 【請求項２】 被塗布物が中心軸を軸として回転する円
筒状または円柱状体であって、平滑化部材が円筒体また
は円柱状体表面上を周方向に走行する請求項１記載の塗
膜形成方法。2. The coating according to claim 1, wherein the object to be coated is a cylindrical or cylindrical body rotating around a central axis, and the smoothing member travels circumferentially on the surface of the cylindrical or cylindrical body. Film formation method. 【請求項３】 平滑化部材の被塗布物当接面が弾性シー
トを用いて構成されている請求項１または２記載の塗膜
形成方法。3. The coating film forming method according to claim 1, wherein the surface of the smoothing member that abuts the object to be coated is formed of an elastic sheet. 【請求項４】 平滑部材の少なくとも被塗布物当接面が
導電性を有する材料で形成され、電気的に接地された請
求項１〜３いずれかに記載の塗膜形成方法。4. The coating film forming method according to claim 1, wherein at least the surface of the smooth member that abuts the object to be coated is formed of a conductive material and is electrically grounded. 【請求項５】 塗液吐出ノズルおよび／または平滑化部
材が導電体で形成されると共に周囲から絶縁されて支持
され、塗液が流動した時に生じる帯電電位と逆の電位が
印加される請求項１〜３いずれかに記載の塗膜形成方
法。5. The coating liquid discharge nozzle and / or the smoothing member are formed of a conductor and supported insulated from the surroundings, and a potential opposite to a charging potential generated when the coating liquid flows is applied. The method for forming a coating film according to any one of 1 to 3, above.