JPH105678A - Coating film forming method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance smoothness and to eliminate the disturbance of outer diameter accuracy, in applying an excessive amt. of a coating soln. to the surface of a base material and scraping off the excessive coating soln. by a coating film surface forming member to form a coating film, by slitting the coating film surface to remove both end parts of the coating film after the curing of the coating soln. SOLUTION: A base material rotating mechanism horizontally rotating a cylindrical base material such as an electrophtographic photosensitive member by a motor 5 is provided and, during the rotation of the base material 1, a coating soln. is supplied to the surface of the base material 1 through a coating soln. supply pipe 15 to form a continuous film. The excessive coating soln. is scraped off by the contact with a coating film surface forming member 18 to form a predetermined coating film. In this case, the joining part fitted to a telescopically inserted part 1a of the inner surface of the end part of the base material 1 and a rotary driving gear 7b are formed to the flange 7 set to the base material 1 before applying a curable resin or correcting outer diameter accuracy and a masking tape 31 is bonded so as to straddle the end part of the base material 1 and the flange 7. After a coating film is formed, the tape 31 is peeled to remove both end parts of the coating film.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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 forming a coating film having excellent dimensional accuracy on the surface of the coating film. A method for forming a coating film which is preferably used for correcting the outer diameter tolerance of a base material such as an aluminum extruded pipe, a paper pipe, a resin pipe, a total runout based on a rotation axis, and a surface accuracy such as a surface roughness. It is about.

[0002]

2. Description of the Related Art Conventionally, a rotating body, particularly an electrophotographic photosensitive member, requires a high degree of rotation accuracy. For example, diameter 3
In the case of a substrate having a thickness of 0.0 mm, the rotational runout around the holes of the flanges joined on both sides is required to have an accuracy of 100 μm or less. Such high rotation accuracy requires not only the accuracy of the flange used but also the dimensional accuracy of the base material used. But,
It is difficult to obtain a base material having such a high dimensional accuracy. For example, it is difficult to achieve a thinned work such as drawing, cutting, ironing, impact, and the like using an aluminum extruded pipe having a constant thickness as a base material. In addition, there is a problem in that if high rotational accuracy is to be obtained, the processing cost is high.

On the other hand, as one of the methods for forming a coating film on the surface of a cylindrical or columnar substrate, a method of discharging a coating liquid from a nozzle or a slit is known. These coating methods, while supporting and rotating the substrate horizontally, supplying the coating liquid on the surface in a spiral, ring, or curtain shape,
This is a method of forming a coating film by the fluidity of a coating liquid.

[0004] However, these conventional coating methods are methods for forming a coating film depending on the fluidity of a coating solution. For example, when the roundness or straightness of the base material itself is poor, it is not changed. There is a drawback that it appears on the coating surface.

[0005] These problems also occur in a method of applying a resin by using a blade to keep the gap with the substrate surface constant. For example, Japanese Patent Application Laid-Open No. 54-38801 discloses a method of forming a coating film by using a coating solution held in a gap between a blade and a substrate surface. The outer diameter shape of the material appears on the coating film surface as it is.

In particular, the diameter of the cylinder or cylinder formed by the fixed outer surface of the coating film is obtained by adding twice the constant gap value to the diameter before coating, so that the roundness or straightness of the base material itself is reduced. In the case of a bad case, these bad outside diameter accuracy appear on the coating film surface as it is, and the outside diameter accuracy cannot be corrected.

[0007]

The present inventor has already made several proposals to improve the outer diameter accuracy of a rotating base by forming a coating by using a coating surface forming member and scraping excess resin liquid. A method has been proposed in which a coating film surface forming member to be removed is used, the trace is not left, the roundness of the center of the preset flange hole is corrected with high accuracy, and a smooth surface can be obtained.

However, when used as an electrophotographic photoreceptor, it is required to be electrically grounded through a shaft inserted into a flange hole, and for this purpose, electrical conduction of the flange portion and a conductive layer as a base on the substrate are required. Must be formed. However, when the base material surface is modified with a non-conductive layer, the conductive layer is insulated from the base material or the flange even if a conductive layer is formed thereon.

Therefore, it is necessary to apply the conductive layer so that the conductive layer has a wider coating width than the non-conductive correction layer so as to be in direct contact with the base material or the flange. When the non-conductive resin liquid is applied to make it non-conductive, the conductive layer to be applied next covers a wider area than the precision-correcting resin layer and ensures conduction between the photosensitive layer and the conductive flange. There must be.

Further, the resin layer is not applied to the end of the base material, and a resin liquid is applied except for the end in order to secure the conductivity of the flange. When the correction method is adopted, the end portion gradually becomes thin, and a portion having poor rotation accuracy may be generated over several mm in some cases.

When used in a copier as an electrophotographic photoreceptor, in the case of a conventional mirror cut tube or ironed tube, a portion without a photosensitive layer is provided at both ends of the photosensitive layer, and a roller is applied thereto.
It has been practiced to keep the gap with the fur brush for charging the toner constant. However, when the coating is performed while leaving the end portion of the base material, there is a problem that it is not possible to obtain the gap accuracy with the fur brush since the portion having the poor outer diameter accuracy becomes the roller contact portion.

[0012]

As a result of various studies, the inventor of the present invention has found that a coating liquid is applied to a coating layer of a required amount or more, the coating liquid is scraped off with a coating surface forming member, and the coating film surface is modified and then cured. And then slit the required area with a slitter,
By removing the coating film in a portion outside the range, it has been found that the required range of accuracy is secured and the conduction of the flange portion is not impaired, and the present invention has been achieved.

Further, depending on the resin liquid and the material of the raw tube and flange, the coating film may not be easily removed only by slitting with a slitter. In this case, a masking tape is attached across the base and the flange, and after the surface is formed and cured, the tape is removed by slitting the tape boundary,
Even when a coating solution having good adhesiveness is used, it can be easily removed. Also, in this case, it was found that it is preferable for the purpose to achieve the object that the tape material is easily wetted by the coating solution and the thickness of the tape is smaller than the final coating film thickness.

That is, in the present invention, a cylindrical or cylindrical substrate is horizontally supported and rotated, and an excessive amount of a coating solution is applied to the surface of the substrate to form a coating film. The film surface forming member is brought into contact with the coating film in a position parallel to the rotation axis of the base material and close to a predetermined distance to scrape off the excess coating solution, and the dimensional accuracy and surface roughness of the base material surface obtained by the coating film are obtained. To improve
Then, in a coating film forming method of curing the coating liquid, a coating film forming method of slitting the coating film surface after curing to remove both end portions of the coating film, and being attached to both end portions of the base material and / or both end portions thereof Affix the masking tape over the entire circumference of the flange, apply the coating liquid on the surface of the base material over the masking tape, scrape off the excess coating liquid, cure the coating liquid, and then apply it to the inner side edge of the masking tape. An object of the present invention is to provide a method for forming a coating film in which slits are formed along the mask and both ends of the coating film are removed together with a masking tape.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION
It can be suitably used for a method for producing a substrate of an electrophotographic photosensitive member. That is, as a coating liquid, for example, when using a coating liquid containing an ultraviolet curable resin, and manufacturing the substrate of the electrophotographic photosensitive member by increasing the outer diameter accuracy of the surface of the substrate, cutting, ironing, impact processing, etc. It is possible to manufacture a substrate having the required outer diameter accuracy by a simple additional process called coating, not by thinning the metal material.

FIGS. 1 and 2 are explanatory views showing an example of a coating apparatus for carrying out the coating film forming method of the present invention. FIG. 1 shows a single nozzle discharging method, and FIG. FIG. 4 is an explanatory diagram in a case where the coating film forming method of the present invention is used for a method of manufacturing a substrate of an electrophotographic photosensitive member. The coating apparatus illustrated in FIG. 1 employs a method of discharging a coating liquid from a nozzle in a spiral manner, and the coating apparatus illustrated in FIG. 2 employs a method of discharging a coating liquid from a nozzle and applying the liquid in a ring shape. Although adopted, in the present invention, the method of supplying the coating liquid is not particularly limited, in addition to the above,
Although a method of supplying a coating liquid in a curtain shape can be adopted, it is preferable to form a continuous coating film in each case.

A coating apparatus exemplified in FIG. 1 includes a substrate rotating mechanism for horizontally supporting and rotating a cylindrical or columnar substrate, and a coating solution on the surface of the substrate while moving in the axial direction of the substrate. And a coating surface forming member arranged parallel to the axis of the base material and rotated and, if necessary, advanced and retracted, and cured by ultraviolet light as the coating solution. When a coating solution containing a resin is used, an ultraviolet irradiation device for curing the coating solution is provided.

The substrate 1 is not particularly limited. In the case of a substrate for an electrophotographic photosensitive member, a glass tube, an extruded aluminum tube,
An aluminum drawing tube, an aluminum cutting tube, a resin tube, a paper tube, a recycled tube once used as an electrophotographic photoreceptor, and after removing the coating film on the surface, is used.

The substrate rotating mechanism includes bearing support plates 2 and 2 vertically arranged at right and left at a predetermined interval, and through bearings (not shown) formed in through holes provided in upper portions of the respective support plates. Rotating shafts 3, 3 arranged horizontally
It comprises a gear 4 fixed to one rotating shaft, a gear driving motor 5, and a timing belt 6 for transmitting rotation of the motor 5 to the gear 4.

The rotation of the cylindrical substrate 1 is performed by using flanges 7, 7 provided with fitting holes for the rotating shaft 3 at the center and mounted on both ends of the substrate 1 in advance. That is,
After attaching the conductive flanges 7, 7 to both ends of the base material 1,
The substrate 1 is placed between the rotating shafts 3 and 3, one of the rotating shafts is advanced, and the collet chucks connected to the rotating shafts 3 and 3 are fitted into the respective center holes of the flanges 7 and 7 for gear driving. The motor 5 is driven to rotate the substrate 1. The mounting of the flanges 7, 7 is performed so that the axes of the bases determined by the respective center holes of the flanges are substantially aligned.

As the flange 7 set on the base material 1 before applying the curable resin for correcting the outer diameter accuracy, any flange capable of rotating the base material 1 around the center axis of the base material 1 as a rotation axis is used. Although there is no particular limitation, to utilize the gist of the present invention, FIG.
As shown in FIG. 7, a flange 7 is provided with a joining portion 7a fitted and mounted on a stamping portion 1a formed on an inner surface of an end portion of the base material 1, and a rotation driving gear 7b for rotating, and a space between them is provided by d.
= 1 to 7 mm, preferably 2 to 4 mm flat cylindrical portion 7c
It is desirable to have an insertion positioning (stopper) function at the time of joining and a function of a space for attaching a masking tape.

It is desirable that a masking tape 31 be applied across the flange 7 and the base material 1 with a width extending beyond the flat cylindrical portion 7c of the flange 7 by 1 to 4 mm toward the base material side.

The coating liquid supply mechanism includes support plates 8 and 8 vertically arranged at right and left sides at predetermined intervals, two guide rods 9 and 9 disposed between the support plates, and support plates 8 and 9. 8, a ball screw 10 arranged between the guide rods 9 and 9 and having one end protruding from the support plate 8, a gear 11 fixed to the end of the ball screw 10 protruding from the support plate 8, and a gear drive. A motor 12, a timing belt 13 for transmitting the rotation of the motor 12 to the gear 11, fitting holes for guide rods 9 provided on the left and right sides thereof, and a ball screw 10 provided at the center of the fitting hole.
Of the base body 1 disposed between the support plates 8 and 8 through a bearing portion of a ball screw that fits therein, one end of which is fixed to the mobile body 14 and the tip end nozzle portion of which is horizontally disposed. , A coating liquid container 16 disposed at the other end of the coating liquid supply pipe 15, and a metering pump 17 disposed in the middle of the coating liquid supply pipe 15. I have. In the illustrated application liquid supply mechanism, the moving body 14 includes a single application liquid supply pipe 15.
However, a plurality of coating liquid supply pipes can be provided at predetermined intervals, and a single coating liquid supply pipe having a common metering pump 17 and a plurality of branched nozzle nozzles. A tube can also be provided. The tip nozzle portion of the coating liquid supply pipe 15 is usually located directly above the substrate 1.

The liquid discharged from the tip of the nozzle does not form a continuous film and must not be applied in a spiral or ring shape. In order to form a continuous film, it is preferable to adopt a method in which the nozzle tip is flexible and rubs the coating surface while discharging, or a method including a blade for smoothing immediately after discharging. It is desirable that the start and end of the application of the coating liquid cover almost the entire length of the substrate.

The configuration of the coating apparatus illustrated in FIG. 2 is the same as that of the coating apparatus illustrated in FIG. 1 except for the coating liquid supply mechanism. Therefore, a different coating liquid supply mechanism will be described. In the application liquid supply mechanism shown in FIG. 2, a set screw (not shown) of a ball screw 28 is attached to an L-shaped member 25 supporting a nozzle head 26, and the nozzle head moves up and down by forward and reverse rotation of a motor 29. . Nozzle head 26
Is provided with a nozzle row 27.

A pump driving motor, a pump 17, and a discharge tube 15a and a suction tube 15 connected to the pump.
The discharge tube 15a is connected to the nozzle head 26. The suction tube 15 b is connected to the application container 16. The nozzle head 26 has a cleaning cutting tube 30 which is used for cleaning the nozzle head. In FIG. 2, a slit may be provided instead of the nozzle row 27.

The coating film surface forming member 18 has an elongated shape, for example, a rod shape as shown in FIGS.
As shown in FIG.
0, 20 and one shaft of the bearing is further provided with an extension gear 21. A timing belt 22 is hung on the gear 21, and the belt is moved by driving a geared motor 23 provided at the other end of the support base.
When moved, the gear rotates, and the coating film surface forming member 18 rotates.

As shown in FIG. 5 (A), the coating film surface forming member 18 has a coating film contact portion 18a formed in an arc along the outer peripheral surface locus formed when the forming member 18 rotates. It is desirable to have a deformed roller shape having a separation portion 18b whose radius is reduced with respect to the rotation axis.

FIG. 5B shows an example of a cross-sectional shape in which a part of a circular arc has a separated portion 18b which is cut out in a curved shape to form an elliptical arc having a small radius. The coating film surface forming member 18 having such a shape can be easily achieved by processing a rod or pipe having excellent straightness. The forming member 18 obtained by these processes is arranged so that the central axis of the forming member 18 and the central axis of the substrate 1 are positioned in parallel.

The coating surface forming member 18 is arranged parallel to the rotation axis of the substrate 1, the length thereof is equal to or longer than the axial coating length of the substrate 1, and
The portion located in parallel with the axis of is linear.
It is desirable that the forming member 18 has a uniform cross section in all parts in terms of manufacturing, and has a rotating shaft 19. A particularly preferable cross-sectional shape of the forming member 18 is a constant cross-section as shown in FIG. 5B having a radius that gradually increases from a position where contact with the application surface is started, and then has a constant radius and further decreases. According to this shape, the part where the member finally faces the application surface comes closest to the rotating shaft 3, and the member surface is rotated from the rotating shaft by rotation until a certain angle from the start of rotation. Reduce the distance.

The material constituting the coating film surface forming member 18 is as follows:
Although not particularly limited, a material that is easily wetted by the used coating liquid is preferable. When the coating film surface forming member 18 is made of a material which is easily wetted by the coating liquid, uniform adhesion can be obtained with a high viscosity coating liquid of 20 to 50 poise.

When the coating surface forming member 18 scrapes off the coating resin on the surface of the substrate 1, the coating liquid between the substrate 1 and the forming member 18 mainly adheres to the substrate 1 side to form the coating film. Heating the forming member 18 to form it, or
As a countermeasure against the occurrence of disturbance of the coating surface when the coating film surface forming member 18 separates from the coating surface on the substrate 1, the forming member 1
It has already been proposed that the forming member 18 be separated from the base material 1 by rotating the forming member 18 in place of the forward / backward movement of 8, and these can be used.

As the coating film surface forming member 18, an iron material is preferably used and quenched, plated, or the like because it is easy to form and maintain a high-precision coating film surface.

The ultraviolet irradiation device is required when a coating solution containing an ultraviolet curable resin is used, and may be any device having a structure capable of irradiating ultraviolet rays over the application surface in the axial direction of the substrate. When a thermosetting resin or the like is used as the coating liquid, a hot air generator is used instead of the ultraviolet irradiation device.

The coating film forming method of the present invention is performed as follows using the above-described coating apparatus. First, the coating liquid is supplied to the surface of the base material 1 by the coating liquid supply mechanism while the base material 1 on which the masking tape 31 is stuck is horizontally supported and rotated by the base material rotation mechanism. Form a film. Next, before the coating liquid on the surface of the substrate 1 loses fluidity, the coating film surface forming member 18 is brought into contact with the application surface in parallel with the axis of the substrate 1.

The contact of the coating surface forming member 18 with the coating surface is performed by setting the coating surface forming member 18 at a predetermined position and rotating the gear 18 with a geared motor and a timing belt.
As shown in (A) and (B), the portion A of the coating film contact portion 18 is brought into contact with the coating film by rotating the portion A toward the substrate 1 side. The maximum advance distance of the coating film surface forming member 18 (the distance between the rotation axis of the base material and the coating film contact portion of the member) depends on the shape of the forming member 18 and the bearing that supports the rotation of the forming member 18. It can be adjusted by either or both of the fixed positions. The contact with the coating surface in the state where the coating film surface forming member 18 is in the closest contact may be normally performed while the substrate 1 rotates 3 to 30 times. Thereafter, the forming member 18 is further rotated to separate the forming member 18 from the application surface without horizontally moving the forming member 18. At this time, the rotation direction of the forming member 18 is desirably the same direction as the rotation direction of the base material 1, that is, the direction of countercurrent at the contact portion.

The direction of rotation of the substrate 1 is such that the coating liquid scraped off by the coating surface forming member 18 is
The direction shown in FIG. 5 (B) in which the water does not stay on the surface and flows down quickly is preferable. Further, since the cross-sectional shape of the forming member 18 is accurately kept constant, the surface of the forming member 18 is moved at the same time as the forming member 18 itself moves and separates while keeping the surface of the coating member parallel to the coating surface. Since it is separated from the surface, traces of detachment of the forming member 18 hardly remain on the application surface. Further, as shown in FIGS. 5A and 5B, the separated portion 18b of the coating film surface forming member 18 does not come into contact with the coating liquid at all during one rotation. Since the formation member is separated from the application surface by using the 18b, the influence of the separation of the member is further reduced.

The contact between the coating film surface forming member 18 and the coating surface of the substrate 1 causes the coating film surface forming member 18 (specifically, a linear portion parallel to the axis of the substrate 1) to contact the substrate 1. Since a coating film having a constant outer diameter determined with respect to the axis can be formed over the application surface of the substrate 1, a substrate having a higher outer diameter accuracy can be obtained by additional processing by coating. When the coating surface forming member 18 is not parallel to the axis of the base material 1 but is in contact with the coating surface in parallel with the body surface of the base material 1, the straightness or roundness of the base material 1 itself is directly applied to the coating film. Appears on the surface, substrate 1
Is not corrected. In the case of a substrate having extremely poor straightness and roundness, it is difficult to obtain a substrate having high outer diameter accuracy according to the present invention, but the cylindricity (JIS B0621-1974) is about 500 μm or less. If it is within a range of preferably about 300 μm or less, it can be corrected by the coating film forming method of the present invention.

The substrate 1 whose surface dimensional accuracy is corrected in this way is cured by heat or ultraviolet irradiation. In the cured base material 1, the coating film is slit at a predetermined width to peel off the coating film at both ends.

When the masking tape 31 is applied to both ends of the base material 1, a slit is formed along the inner edge of the masking tape 31 and the coating film is peeled off together with the masking tape 31.

As the coating liquid, any coating liquid can be used as long as it is applicable to the nozzle coating method and the curtain coating method. And, in the case of a solvent-type coating liquid, that is, in the case of a coating liquid using a solvent having a high drying rate, the coating and the contact treatment with the coating surface of the coating surface forming member are performed in the space covered with the solvent vapor, and thereafter, Preferably, the drying is performed in a space where the evaporation of the solvent is promoted.
Specifically, using a coating device having an appropriate detachable cover, coating and contact processing are performed with the cover covered, and drying is performed with the cover removed. Further, in the case of a coating liquid in which the volume change of the coating film is large due to curing after coating, for example, a coating liquid in which the volume change of the coating film is 50% or more, coating, contact treatment, and drying are performed as a series of operations, and the operation is performed. It is good to repeat.

The means for gripping the base material is not particularly limited as long as it can hold the base of the base material so that the axis of the base material comes out. Means for gripping (inner collet chuck) or the like can be employed. In the case of a cylindrical base material, a gripping means or the like that holds the base material by contacting both end surfaces thereof can be employed.

[0043]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to the following examples unless it exceeds the gist of the present invention.

Example 1 An aluminum extruded tube having an outer diameter of 29.53 mm to 29.63 mm was used as a base material. A conductive flange having a structure shown in FIG. 3 was fitted to both ends of the extruded aluminum tube. A vinyl tape of 4 mm width was stuck on both sides so as to straddle it.

The coating apparatus shown in FIG. 1 was used. That is, as the coating liquid supply pipe of the coating liquid supply mechanism, one nozzle having an inner diameter of 2 mmφ is separated from the work by 20 mm, and the
UV curable resin (BYX-324-7) at ml / min
(Manufactured by Asahi Denka Co., Ltd.), and applied spirally to an aluminum extrusion tube. The resin was leveled on an extruded tube to form a continuous film. The extruded tube was set with a conductive flange, chucked the flange hole and rotated at 300 rpm, and the nozzle was fed at 1 mm / rev.

As a member for forming a coating film surface, FIG.
The device of (B) was used. The heater was heated so that the radius R was 20.00 mm and the surface temperature was 50 ° C. Coating area 30mmφ × 300rpm × 1mm / rev = 283c
m ² / min Film thickness 12 ml / min ÷ 282.7 cm ² / min = 424
μ

The member for forming a coating film surface is brought close to a position of 15.03 mm from the center of rotation of the extruded tube, and 5 rpm
In, the coating film contact portion is rotated so as to contact the coating resin surface,
After the coating solution was scraped off at the arc, it was separated from the coating surface.

After the coating film surface forming member was receded and covered with a light-shielding cover, a high-pressure mercury lamp of 3 kW was separated from the coated surface of 20 cm and irradiated for 1 minute to cure. After curing, slit the vinyl tape boundary at both ends of the extruded pipe with a knife,
The coating including the tape was cut off.

The total runout of the extruded tube based on the rotation axis is 120 μm.
m was 40 μm including the end of the membrane after the correction. The outer diameter was 30.01φ. The coating film surface had a portion that scatters light very slightly, but was mostly a mirror surface. After removing the coating film, a conductive paint was applied to the end of the flange and dried. Resistance value between flanges is 50 to 200k
Ω satisfied the requirements for an electrophotographic photosensitive member.

Example 2 In Example 1, the ultraviolet curable resin liquid (BYX-324-
The coating range of 7) is set to a range of 7 mm from the edge of the base material, respectively,
Except for this, the conditions were exactly the same, and the coating surface was formed with the coating surface forming member. The coating surface is formed from 1 to 2 mm from the end of the base material, and the film thickness gradually increases from 5 mm from the end, and the accuracy of the coated surface is not satisfied in this state. The slit was removed from the coating film at a position 6 mm from the end, and the coating film was used in the same manner as in Example 1.

Example 3 The same operation was performed except that the vinyl tape was not attached to the joint between the flange and the extruded tube. After ultraviolet irradiation, the coating was removed by slitting with a knife at a position 2 mm from the end of the substrate, but it was difficult to remove the coating film on the flange portion.

[0052]

According to the present invention, there is provided an improved method for forming a coating film which can be used for enhancing the outer diameter accuracy regardless of the processing accuracy of a cylindrical or columnar substrate. Then, by utilizing the coating film forming method of the present invention, the required outer diameter accuracy (straightness, roundness, cylindrical shape, (E.g., degree, surface roughness, etc.) of the electrophotographic photoreceptor can be manufactured, and a highly accurate smoothness can be obtained without leaving traces of the coating film surface forming member.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part showing an example of a coating apparatus for performing a coating film forming method of the present invention.

FIG. 2 is a perspective view of a main part showing another example of a coating apparatus for performing the coating film forming method of the present invention.

FIG. 3 is a view showing a base material and a flange mounted on the base material;
(A) is a longitudinal sectional view before mounting, and (B) is a longitudinal sectional view after mounting.

FIG. 4 is a perspective view showing a coating film surface forming member and its driving mechanism.

FIGS. 5A and 5B are explanatory views showing a coating film surface forming member and its operation, respectively.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Substrate 3 Rotation axis 14 Moving body 15 Coating liquid supply pipe 17 Metering pump 18 Coating surface forming member 31 Masking tape

Claims (5)

[Claims] Claims: 1. A cylindrical or cylindrical substrate is horizontally supported and rotated, and an excessive amount of a coating solution is applied to the surface of the substrate to form a coating film. In parallel with the rotation axis of the substrate and close to a position at a predetermined distance to scrape off the excess coating solution and improve the dimensional accuracy and surface roughness of the substrate surface obtained by the coating. Then, a coating film forming method for curing the coating liquid, wherein the cured coating film surface is slit to remove both end portions of the coating film. 2. A masking tape is attached to both ends of a base material and / or a flange attached to the both ends over the entire circumference, and a coating liquid is applied to a surface of the base material over the masking tape. Scraping off excess coating liquid, then slitting along the inside edge of masking tape after curing the coating liquid,
2. The coating film forming method according to claim 1, wherein both ends of the coating film are removed together with the masking tape. 3. A flange is connected to both ends of the base material, a masking tape is stuck over the entire periphery of the flange peripheral surface and the end portion of the base material, and a coating solution is applied to the surface of the base material over the masking tape. 2. The coating film forming method according to claim 1, wherein after coating, the excess coating liquid is scraped off, and then the coating liquid is cured and slit along the inner side edge of the masking tape to remove both ends of the coating film together with the masking tape. 4. The coating film forming method according to claim 2, wherein the inner thickness of the masking tape attached is smaller than the thickness of the coating film formed on the substrate surface. 5. The coating film forming method according to claim 2, wherein the masking tape has excellent wettability to a coating solution.