JPH08323279A - Method for positioning of cylindrical base material and cylindrical base material for vertical coating apparatus - Google Patents

Abstract

PURPOSE: To perform positioning of a base material without giving any flaw by setting static frictional coefficients of both end faces of the base material within a specified range in a process wherein step differences among a plurality of base materials each other are modified by applying an external force on the outer peripheral face of a cylindrical base material by a positioning means. CONSTITUTION: In a vertical coating apparatus 10 for performing coating on cylindrical base materials 1A and 1B by means of a coating head 11, a coating liq. is fed to the coating head 11 through a coating liq. distributing room 14, a coating liq. outlet 12, etc. A positioning device 20 is arranged on the lower part of this vertical coating apparatus. This positioning device 20 consists of an outer cylindrical member 21 and an inner cylindrical member 22 and a plurality of intake vents 23 and exhaust vents 26 are respectively recessedly provided. Then, step differences or positioning for a plurality of base materials each other are performed by applying an external force on the outer peripheral face of the base material 1, and in this case, static frictional coefficients of both end faces of the base material are set in a range of 0.5-2.5. Generation of deviation between both end faces of adjoining base materials is suppressed thereby.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for positioning a cylindrical base material when continuously coating a treatment liquid on the outer peripheral surface of a plurality of cylindrical base materials, and a cylindrical base material for a vertical coating device. In particular, by applying a photosensitive solution to a cylindrical substrate,
The present invention relates to a method for accurately positioning a cylindrical substrate and a cylindrical substrate when manufacturing an electrophotographic photosensitive member.

[0002]

2. Description of the Related Art In manufacturing an organic photoconductor photosensitive drum which is a photosensitive member used in an electrophotographic apparatus, a photosensitive photosensitive liquid (treatment liquid) is applied to a cylindrical drum. In the coating, it is necessary to adjust the slide hopper at a predetermined position on the peripheral surface of the cylindrical drum and to keep the gap between them constant in the circumferential direction. In this case, since the required coating layer thickness is extremely thin,
Even if it is deviated by mm, with respect to the circumferential direction, it causes a large deviation in the film thickness of the coating layer when viewed as the entire cylindrical surface.

It is a well-known fact that such a film thickness deviation of the coating layer causes various problems such as a change in charge amount, a non-uniform sensitivity, and a change in residual potential in the circumferential direction of the cylindrical drum. Therefore, accurate positioning of the cylindrical drum is extremely important.

Conventionally, as a positioning device for this type of cylindrical drum, for example, as disclosed in Japanese Patent Laid-Open No. 60-50537, a position regulating roller rotatably provided on a supporting member is provided on the outer periphery of the cylindrical drum. Some are provided in contact with each other.
Further, JP-A-3-280063 and JP-A-4-7
Japanese Patent No. 3655 discloses a photosensitive drum positioning device using an air bearing.

[0005]

However, since the above-mentioned conventional roller contact type positioning device positions the position regulating roller while directly contacting the cylindrical drum, the cylindrical drum is damaged. There was a difficulty that it would keep up. It is well known that scratching a cylindrical drum will degrade the electrophotographic properties.

The air bearing type positioning device is
A fluid such as air is sprayed from a spray nozzle to perform positioning, which is extremely effective because scratches on the cylindrical drum can be prevented.

However, as shown in FIG. 7 (a), when the end portions of a plurality of cylindrical drums 1A and 1B are brought into contact with each other and stacked and moved, the cylindrical drum 1A is moved forward.
7 escapes from the positioning spray nozzle 3 and moves to the next cylindrical drum 1B, when an external force is applied to move the previous cylindrical drum 1A in the horizontal direction due to an external factor, as shown in FIG. So even if the next cylindrical drum 1B
Even if the positioning can be performed, the cylindrical drum 1A may be abruptly displaced in the horizontal direction. When this movement phenomenon occurs, it appears as a horizontal step of the photosensitive solution or a coating solution running out.

The main object of the present invention is to position the cylindrical drum without damaging the cylindrical drum, and
The purpose is to prevent displacement of the cylindrical drums at the connecting portion between the cylindrical drums.

[0009]

A method of positioning a cylindrical base material according to claim 1 of the present invention which solves the above-mentioned problems is a method of stacking a plurality of cylindrical base materials by aligning their cylindrical axes, and from top to bottom. While vertically pushing up, in the step of continuously applying the coating liquid on the outer peripheral surface of the cylindrical substrate by a vertical coating device, the coating liquid is disposed coaxially with the cylindrical substrate at a position before or after coating. By the positioning means consisting of, by applying an external force from a direction perpendicular to the cylinder axis of the outer peripheral surface of the cylindrical substrate,
In a method of positioning a cylindrical base material for correcting a step between or positioning a plurality of cylindrical base materials, static friction coefficients of both end surfaces of the plurality of cylindrical base materials are in the range of 0.5 to 2.5. It is characterized by that.

According to a fourth aspect of the present invention, in a positioning device for a cylindrical base material for a vertical coating device, a plurality of cylindrical base materials are piled up by aligning their cylindrical axes, and vertically pushed upward from below, In the step of continuously applying the coating liquid on the outer peripheral surface of the cylindrical base material by a vertical coating device, at a position before or after coating, by a positioning means arranged coaxially with the cylindrical base material, In a cylindrical base material used in a vertical coating device that applies an external force from a direction perpendicular to the cylinder axis of the outer peripheral surface of the cylindrical base material while performing step correction or positioning between the plurality of cylindrical base materials. The static friction coefficient of both end surfaces of the plurality of cylindrical base materials is 0.5 to
It is characterized by being in the range of 2.5.

[0011]

In the present invention, the fluid is sprayed onto the outer peripheral surface of the cylindrical substrate, and the cylindrical substrate is positioned by the amount of the fluid. That is, when a fluid such as air is blown from around the cylindrical base material, the position of the cylindrical base material is neutralized due to the amount of the sprayed fluid, whereby the cylindrical base material is positioned at a predetermined position. Moreover, since the cylindrical base material does not come into mechanical contact with the cylindrical base material, it is possible to prevent the cylindrical base material from being damaged.

[0012] On the other hand, a plurality of cylindrical base materials are stacked by aligning the cylinder axes, and while vertically pushing upward from below, a vertical coating device continuously applies the coating liquid onto the outer peripheral surface of the cylindrical base material, At the position before or after coating, the hollow cylindrical spraying means having a discharge port for spraying a fluid onto the outer peripheral surface of the cylindrical base material is positioned by the positioning means formed coaxially with the cylindrical base material to form the cylinder. In a cylindrical substrate positioning device that positions a cylindrical substrate, if there is at least one cylindrical substrate with a poor squareness in positioning, it is discharged from the spraying device. Air enters the connecting portion where the end faces of each of the cylindrical base materials are in contact with each other, the cylindrical base material floats up, tilts or vibrates, and adversely affects all the cylindrical base materials that progress in a stack, Application There is reduced.

The present invention is characterized in that the static friction coefficient of both end faces of the cylindrical substrate is in the range of 0.5 to 2.5. In the process of continuously applying the coating liquid on the outer peripheral surface of the cylindrical base material by the vertical coating device while vertically stacking the cylindrical base materials of the plurality of cylindrical base materials by vertically stacking them up from below, the static friction When the coefficient is less than 0.5, a shift is likely to occur between both end faces of both of the cylindrical base materials that are in contact with each other due to vibration or unwanted external force. If the static friction coefficient of both end surfaces of the cylindrical base material is larger than 2.5, both end surfaces of the adjoining cylindrical base materials are hard to slip, and the step difference between the plurality of cylindrical base materials is corrected or positioned. Will be difficult to do. In particular, a plurality of cylindrical base materials having a large weight per one are stacked with the cylinder axis being vertical and vertically pushed upward from below, and applied onto the outer peripheral surface of the cylindrical base material by a vertical coating device. In the step of continuously applying the liquid, the force (total weight) applied to the lowermost cylindrical base material becomes large, so that it is difficult to perform the step correction or the positioning between the cylindrical base materials. Therefore, it is preferable that the static friction coefficient of both end surfaces of the cylindrical substrate is small. This static friction coefficient varies depending on the size and weight of the cylindrical base material, but is preferably 0. 0 in a commonly used image forming apparatus.
A range of 7 to 2.0 is good.

The static friction coefficient (μ) is obtained by stacking two cylindrical base materials with the cylinder axis vertical and fixing the lower cylindrical base material to the upper cylindrical base material having a weight W. An external force in the horizontal direction is applied, and an external force (static maximum frictional force) F when the upper cylindrical base material starts to move is measured by, for example, a strain gauge, and is calculated by F / W = μ. The above static maximum frictional force F is measured by the FRICTRON M
It measured by ODEL EFM-3-F (made by Orion Tech) or the improvement machine based on the said measuring device.

In a step of continuously applying the coating liquid on the outer peripheral surface of the cylindrical base material by a vertical coating device, positioning is performed by arranging coaxially with the cylindrical base material at a position before or after coating. As the means or the means for correcting the step difference between the cylindrical base materials, a method using a discharge flow of a fluid such as air is preferable, and it is described in JP-A-3-274564. Alternatively, those using a touch roll, for example, Japanese Patent Laid-Open No.
Those described in each of the gazettes of 0-50537 and 60-95546 may also be used.

The positioning device having a plurality of discharge ports may be used by continuously connecting two or more sets in the axial direction.

The preferred fluid used for the positioning device is air or an inert gas (for example, nitrogen gas).
And, these fluids are preferably clean gases of class 100 or higher according to JIS standard.

As the vertical coating device, a slide hopper type coater, an extrusion type coater, a ring type coater, a spray coater or the like is used. Any of the above coaters as a coating device as long as the photosensitive liquid can be coated by the coating device by stacking a plurality of cylindrical base materials with the cylinder axis vertical and moving them relatively upward or downward. However, a slide hopper type coater is particularly preferable.

[0019]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a sectional view showing the entire annular vertical coating device including the positioning device of the present invention. The vertical coating apparatus comprises a cylindrical base material (cylindrical drum) 1A and 1B which are vertically stacked along a center line O, and a coating liquid (photosensitive liquid) 2
A vertical coating device 10 for coating the substrate, a cylindrical substrate positioning device 20 fixed below the vertical coating device 10, and a drying hood 30 installed above the vertical coating device 10.
And a supporting device 40 fixed to the lower part of the positioning device 20.

Inside the vertical coating device 10, a coating head 11 for coating the coating liquid 2 so as to surround the outer periphery of the cylindrical substrate 1A, and a tapered coating liquid outlet (coating liquid) adjacent to the coating head 11. A slide surface 12, a coating liquid distribution slit 13 forming a horizontal coating liquid passage, and a coating liquid distribution chamber 14 are formed. The coating liquid distribution chamber 14
A coating liquid supply pipe 16 is connected to the coating liquid, and the coating liquid is supplied by a pressure feed pump (not shown).

The coating method by the vertical coating device 10 is as follows.
The vertical coating device 10 is fixed, and coating is performed by the coating head 11 from the upper end of the cylindrical substrate 1A while moving the cylindrical substrate 1A upward along the center line O in the direction of the arrow.

A fixed amount of the coating liquid is stably fed to the vertical coating device 10 by a pressure pump, and the coating liquid supply pipe 16, the coating liquid distribution chamber 14, the coating liquid distribution slit 13, and the coating liquid outlet 12 are provided. After that, the coating liquid is supplied to the coating head 11, and the coating liquid is coated on the surface of the cylindrical substrate 1A to form a photosensitive layer.

An annular drying hood 30 is fixed to the upper portion of the vertical coating device 10. A large number of openings 31 are formed in the drying hood 30. The photosensitive layer on the cylindrical substrate formed by the vertical coating device 10 gradually dries the coated photosensitive liquid 2 while passing through the drying hood 30. The drying is performed by releasing the solvent contained in the photosensitive liquid to the outside through the opening 31.

A positioning device 20 is fixed to the lower portion of the vertical coating device 10. 2A is a sectional view of the positioning device 20 in FIG.
(B) is a BB sectional view (exhaust part).

The cylindrical base material positioning device 20 comprises an outer cylinder member 21 and an inner cylinder member 22 fixed inside the outer cylinder member 21. The outer cylinder member 21 and the inner cylinder member 22 are provided with a plurality of air supply ports 23 penetrating both members and a plurality of exhaust ports 26. The plurality of air supply ports 23
Is connected to the air supply pump 29, and a fluid such as air is pressure-fed.

As shown in FIGS. 1 and 2 (a), the outer cylinder member 21 has four air supply ports 23 arranged horizontally in a radial direction, and further has a plurality of vertical stages (five stages shown in the figure). ) It is arranged. A horizontal groove 24 is formed in the inner peripheral surface of the outer cylindrical member 21 to form a horizontal flow path between the outer cylindrical member 21 and the outer peripheral surface of the inner cylindrical member 22, and the grooves are arranged radially in the horizontal direction.
It communicates with the individual air supply port 23. A hole having twelve discharge ports 25 in the horizontal direction penetrates through the inner cylinder member 22. The discharge port 25 faces the outer peripheral surface of the cylindrical substrate 1 with a gap G therebetween. The gap G is 20 μm to 3
mm, preferably 30 μm to 2 mm. This gap G
Is less than 20 μm, the cylindrical base material 1 is likely to be damaged by contacting the inner cylindrical member 22 with a slight shake of the cylindrical base material 1.
Further, when the gap G is larger than 3 mm, the positioning accuracy of the cylindrical base material 1 is reduced. The discharge port 25 has a diameter of 0.0
The nozzle has a small diameter of 1 to 1.0 mm, preferably 0.05 to 0.5 mm.

As shown in FIG. 1 and FIG. 2B, four exhaust holes 26 are arranged horizontally in a radial direction through the outer cylinder member 21 and the inner cylinder member 22, and further in a vertical direction. A plurality of stages (5 stages in the figure) are arranged. The exhaust ports 26 are arranged alternately with the air supply ports 23 in the vertical direction. A vertical groove 27 is formed on the inner peripheral surface of the inner cylinder member 22,
The plurality of stages of exhaust ports 26 communicate with each other.

The inner peripheral surface of the lower portion of the inner cylinder member 22 is a tapered surface 28 that widens on the inlet side. The tapered surface 28 is, for example, a conical surface having an axial length of 50 mm and a one-sided inclination angle of 0.5 mm. This taper surface 2
The taper ratio of 8 is 0.005 to 0.2, preferably 0.01 to 0.1. By providing the tapered surface 28, the position is regulated when the cylindrical base material 1 horizontally moves or tilts and enters the positioning device 20, which is effective.

By providing this tapered surface 28,
When the cylindrical base material 1 enters the inner cylinder member 22, the tip of the cylindrical base material 1 is prevented from coming into contact with the inner peripheral surface of the inner cylinder member 22.

The fluid pumped from the air supply pump 29 is introduced into the outer cylinder member 23 through the plurality of air supply ports 23, and is discharged through the plurality of discharge ports 25 through the horizontal groove 24 to form the cylindrical shape. A uniform fluid film layer is formed on the outer peripheral surface of the base material 1A (1B). The discharged fluid is discharged to the outside of the apparatus through the plurality of exhaust ports 26 through the vertical groove 27.

The opening diameter of the discharge port 25 is 0.01 to 1
mm, preferably 0.05 to 0.5 mm, for example 0.2
It is formed in a circular shape of 0.5 mm. The opening diameter of the exhaust port 26 is 1.0 to 10 mm, preferably 2.0 to 8.0.
It is formed in a circular shape of mm, for example, 3 to 5 mm. The discharge port 25 and the exhaust port 26 are integrally incorporated on the side of the member (inner tubular member 22) forming the innermost surface of the positioning means 20 facing the outer peripheral surface of the cylindrical substrate 1. .

The amount of fluid supplied to the air supply port 23 per minute is 0.1 to 50 m ³ / min. Is preferred. The amount of fluid is 0.1 m ³ / min. If it is smaller, the positioning accuracy of the cylindrical substrate 1 is extremely deteriorated, and 50 m ³ /
min. When it becomes larger, the influence of the air volume becomes stronger, the stacked cylindrical substrates 1 vibrate, and the liquid film becomes nonuniform. Therefore, in particular, the amount of fluid per minute is 0.2 to 2
0 m ³ / min. Is preferred. Here, if the fluid to be regulated and supplied is not fluid pressure regulation and fluid amount control is not performed, an influence on the liquid film immediately after coating (film thickness unevenness or the like) occurs. In addition,
The amount of fluid per minute is determined by the air supply port 23 of the positioning device 20.
It was measured at the entrance. The amount of fluid supplied to the plurality of air supply ports 23 per minute is preferably the same as the flow rate of the air supply ports 23 in the axial direction or higher in the upper flow rate than in the lower flow rate.

The positioning device 20 shown in FIG.
Although it is a set of units, two or more sets may be connected and connected in the vertical direction.

As the vertical coating device connected to the positioning device of the present invention, various devices such as a slide hopper type, an extrusion type, a ring coater, and spray coating are used.

The fluid supplied to the air supply port 23 is preferably air or an inert gas such as nitrogen gas. The fluid is preferably clean gas of class 100 or higher according to JIS standard.

[Examples] The present invention will now be described with reference to specific examples, but the present invention is not limited thereto.

Example 1 (Examples and Comparative Examples) The conductive support (cylindrical base material) 1 has a mirror-finished diameter of 80 mm and a height of 355 mm.
Of aluminum drum support.

A coating liquid composition UCL-1 (3.0 W / V% polymer concentration) was prepared on the conductive support 1 as follows, and a slide hopper type coating apparatus 10 as shown in FIG. 1 was used. Applied. 3 is a schematic sectional view of the coating device 10 and the positioning device 20, and FIG. 4 is a positioning device 20.
It is a partially broken perspective view of FIG. In this embodiment, the ring-shaped positioning device 20 shown in FIG.
(Length H = 250 mm, diameter of discharge port 25 is 0.3 mm,
An exhaust port 26 having a diameter of 2.0 mm) is installed, and a cylindrical base material No. having a static friction coefficient (μ) shown in Table 1 below. 1
-1 to No. Experiments were performed using 1-5. The end surface of the cylindrical base material having a static friction coefficient μ of less than 0.60 is subjected to Teflon coating treatment, and the end surface of the cylindrical base material having a static friction coefficient of more than 2.5 is subjected to urethane coating to make it stationary. The friction coefficient μ was adjusted. In addition, the cylindrical substrate 1 (1A,
1B) moving speed is 20 mm / sec, the gap between the coater (coating head) 11 and the cylindrical substrate 1 is 100 μm,
Gap between the inner wall surface of the positioning device 20 and the cylindrical substrate 1 G =
Continuous coating was performed at 100 μm.

UCL-1 coating liquid composition Copolymerized nylon resin (CM-8000, manufactured by Toray Industries, Inc.) Methanol / n-butanol = 10/1 (Vol ratio) Table 1 shows the coating results according to Examples and Comparative Examples.

[0041]

[Table 1]

As shown in Table 1, the photosensitive drum No. 1
In this example for -1,1-2,1-3, the static friction coefficient μ of the end surface of the cylindrical base material is in the range of 0.5 to 2.5, and the cylindrical base material 1 and the coater are all used. No scratch or damage was given to No. 11, the coating unevenness of the coating film and the film thickness fluctuation were small, and the coating defect did not occur.

On the other hand, the photosensitive drum No. 1 having a static friction coefficient μ of less than 0.5. 1-4 (Comparative Example) is a cylindrical substrate 1 during the positioning process in the positioning device 20.
It was easy for slippage to occur between the end faces, and a gap between the two end faces immediately occurred due to stray wind and small vibrations. In this comparative example, the positioning performance was unstable, and troubles such as contact between the cylindrical base material 1 and the inlet of the coating device 10 and contact between the cylindrical base material 1 and the inner wall surface of the positioning device 20 occurred. The application of vibration caused uneven coating. Further, the coating property of the coating liquid on the cylindrical substrate 1 was poor, and troubles such as scratches and abrasions occurred.

Further, the photosensitive drum No. 1 having a static friction coefficient μ of more than 2.5. 1-5 (comparative example) are cylindrical base materials 1A and 1B during the positioning process in the positioning device 20.
It was difficult to make relative movement between the end faces of, and the step difference between the upper and lower cylindrical substrates could not be corrected. Therefore, the cylindrical substrate 1
Collided with the coater 11 of the coating apparatus 10 and normal coating could not be performed.

Example 2 (Examples and Comparative Examples) As the conductive support (cylindrical base material) 1, a mirror-finished surface having a diameter of 80 m similar to that of Example 1 was used.
An aluminum drum support having a height of 355 mm and a height of 355 mm was used.

Coating solution composition C was formed on the support as follows.
GL-2 (3.0 W / V% polymer concentration) was dispersed and prepared, and a slide hopper type coating apparatus 1 as shown in FIG.
0 was used for coating. FIG. 5 is a schematic cross-sectional view of the coating device 10 and the positioning device 20. The discharge port surface of the positioning device 20 having a plurality of discharge ports 25 is a cylindrical surface having a constant gap G at the inner wall portion of the upper outlet portion having a length H1, and the inner wall portion having a constant gap G of the lower inlet portion is Tapered surface 2
8 is a conical surface having 8. FIG. 6 is a sectional view for explaining the taper ratio C of the taper surface 28. The taper ratio C is defined by the inlet diameter D and the outlet diameter d perpendicular to the axis of the cone.
Is divided by the axial length H2 of the tapered surface 28 (C = (D−d) / H2).

In this embodiment, a ring-shaped positioning device 20 (length H1 = 2) shown in FIG.
40 mm, H2 = 100 mm, diameter of discharge port 25 is 0.1
mm, the diameter of the exhaust port 26 is 4.0 mm, the taper ratio C =
0.05), and using cylindrical base materials 1 having different static friction coefficients μ as shown in Table 2 below. 2-1 to No. 2-5 was obtained. The end surface of the cylindrical base material 1 having a static friction coefficient μ smaller than 0.60 is subjected to Teflon coating treatment, and the end surface of the cylindrical base material 1 having a static friction coefficient μ larger than 2.5 is coated with urethane resin. Then, the coefficient of static friction μ was adjusted.

The moving speed of the cylindrical substrate 1 is 30 mm.
/ Sec, coater (coating head) 11 and cylindrical substrate 1
The continuous coating was performed with a gap of 100 μm and a gap G = 100 μm between the inner wall surface of the positioning device 20 and the cylindrical substrate 1.

CGL-2 coating liquid composition Perylene pigment (CGM-2) Butyral resin (S-REC BX-L Sekisui Chemical Co., Ltd.) Methyl ethyl ketone The above coating liquid composition (solid content weight ratio CG
M-2: BX-L = fixed at 2: 1) dispersed with a sand mill for 20 hours.

[0050]

Embedded image

The coating results are shown in Table 2.

[0052]

[Table 2]

As shown in Table 2, the photosensitive drum No. Two
In this example for -1, 2, 2 and 2-3, the static friction coefficient μ of the end surface of the cylindrical base material is in the range of 0.5 to 2.5, and the cylindrical base material 1 and the coater are all used. No scratch or damage was given to No. 11, the coating unevenness of the coating film and the film thickness fluctuation were small, and the coating defect did not occur.

On the other hand, the photosensitive drum No. 1 having a static friction coefficient μ of less than 0.5. 2-4 (Comparative Example) is a cylindrical substrate 1 during the positioning process in the positioning device 20.
It was easy for slippage to occur between the end faces, and a gap between the two end faces immediately occurred due to stray wind and small vibrations. In this comparative example, the positioning performance is unstable, and troubles such as contact between the cylindrical base material 1 and the inlet of the coating device 10 and contact between the cylindrical base material 1 and the inner wall surface of the positioning device 20 occur. The application of vibration caused uneven coating. Further, the coating property of the coating liquid on the cylindrical substrate 1 was poor, and troubles such as scratches and abrasions occurred.

Further, the photosensitive drum No. 1 having a static friction coefficient μ of more than 2.5. 2-5 (comparative example) is a cylindrical base material 1A, 1B during the positioning process in the positioning device 20.
It was difficult to make relative movement between the end faces of, and the step difference between the upper and lower cylindrical substrates could not be corrected. Therefore, the cylindrical substrate 1
Collided with the coater 11 of the coating apparatus 10 and normal coating could not be performed.

Example 3 (Example) As the conductive support (cylindrical base material) 1, the same aluminum drum support as in Example 1 was used.

A coating liquid composition CTL-1 (35 W / V% solid content concentration) was prepared on the conductive support 1 as follows, and a slide hopper type coating apparatus 1 as shown in FIG. 1 was prepared.
0 was used for coating. At this time, the same positioning device 20 as in Example 1 was installed immediately before the coating device 10, the cylindrical substrate 1 as shown in Table 3 was used, and the photosensitive drum No. Three
-1 to No. 3-3 was obtained. The end surface of the cylindrical base material having a static friction coefficient μ of less than 0.60 is subjected to Teflon coating treatment, and the end surface of the cylindrical base material having a static friction coefficient of more than 2.5 is subjected to urethane coating to make it stationary. The friction coefficient μ was adjusted. Further, continuous coating was performed at a moving speed of 5 mm / sec, a gap between the coater 11 and the cylindrical substrate 1 of 250 μm, and a gap G of 100 μm.

CTL-1 coating liquid composition CTM-1 polycarbonate (Z-200 manufactured by Mitsubishi Gas Chemical Co., Inc.) 1,2-dichloroethane Solid content weight ratio CTM-1: Z-200 for solid content.
Fixed at = 0.89: 1

[0059]

Embedded image

The coating results are shown in Table 3.

[0061]

[Table 3]

As shown in Table 3, the photosensitive drum No. Three
In this example for -1, 3-2 and 3-3, the positioning accuracy was high, there were no scratches and coating unevenness, and the coating performance was good.

The photoconductor of the present invention is UCL / CGL / CTL.
When an OPC photoconductor having three layers, which were sequentially laminated, was produced and actually photographed, both the transportability and the coating property were good. When the images were actually photographed, unevenness in light and shade, fog and image defects (black spots, white spots, stripes) There was no failure or damage, and it was good. It also did not damage the coater.

[0064]

By the method and apparatus for positioning a cylindrical substrate provided in the coating apparatus of the present invention, the following excellent effects are obtained.

(1) The fluctuation of the photosensitive film thickness coated on the cylindrical substrate was extremely small.

(2) The coating property of the coating liquid on the cylindrical substrate was improved.

(3) The occurrence of scratches on the surface of the cylindrical substrate was eliminated.

(4) The coating liquid discharge part (coater) of the coating device is not damaged.

(5) The positioning accuracy of the cylindrical substrate is improved.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a positioning device and a coating device according to the present invention.

FIG. 2 is a sectional view taken along line AA and a sectional view taken along line BB of the positioning device.

FIG. 3 is a schematic cross-sectional view of a coating device and a positioning device.

FIG. 4 is a partially cutaway perspective view of the positioning device.

FIG. 5 is a schematic cross-sectional view showing another embodiment of the positioning device.

FIG. 6 is a sectional view illustrating a discharge taper surface of a positioning device.

FIG. 7 is a schematic diagram illustrating a state in which cylindrical base materials are stacked and conveyed.

[Explanation of symbols]

1, 1A, 1B Cylindrical base material (cylindrical drum, conductive support) 2 Treatment surface (photosensitive liquid surface) 10 Vertical coating device (slide hopper type coating device) 11 Coating head (coater) 20 Positioning device (positioning means) ) 21 outer cylinder member 22 inner cylinder member 23 air supply port 25 discharge port 26 exhaust port 28 taper surface 29 air supply pump

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masao Asano 2970 Ishikawacho, Hachioji City, Tokyo Konica Stock Company

Claims (4)

[Claims] 1. A step of stacking a plurality of cylindrical base materials so that their cylindrical axes are aligned with each other and continuously pushing up the outer peripheral surface of the cylindrical base material with a vertical coating device while vertically pushing upward from below. In, at the position before or after application,
Positioning means arranged coaxially with the cylindrical base material applies an external force from a direction perpendicular to the cylinder axis of the outer peripheral surface of the cylindrical base material to correct a step between the plurality of cylindrical base materials or In the method of positioning a cylindrical base material for positioning, the static friction coefficient of both end surfaces of the plurality of cylindrical base materials is 0.
A method for positioning a cylindrical substrate, which is in the range of 5 to 2.5. 2. The positioning device for a cylindrical substrate according to claim 1, wherein the vertical coating device is a slide hopper type coating device. 3. The method for positioning a cylindrical substrate according to claim 1, wherein the external force is a pressure of a fluid ejected from a discharge port. 4. A step of stacking a plurality of cylindrical base materials by aligning their cylindrical axes with each other and continuously applying a coating liquid onto the outer peripheral surface of the cylindrical base material by a vertical coating device while vertically pushing upward. In, at the position before or after application,
Positioning means arranged coaxially with the cylindrical base material applies an external force from a direction perpendicular to the cylinder axis of the outer peripheral surface of the cylindrical base material to correct a step between the plurality of cylindrical base materials or In a cylindrical base material used for a vertical coating device that performs coating while performing positioning, the static friction coefficient of both end faces of the plurality of cylindrical base materials is 0.
A cylindrical substrate for a vertical coating device, which is in the range of 5 to 2.5.