JP2011145404A - Method of manufacturing electrophotographic photoreceptor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing an electrophotographic photoreceptor suppressing another failure while achieving a sampling purpose in a process of sampling, with a brush, photosensitive layer coating liquid adhering to an end of a conductive support. <P>SOLUTION: The method is provided for manufacturing the electrophotographic photoreceptor by applying the photosensitive layer coating liquid to the conductive support and drying it. The method includes the process of sampling, with the brush, the photosensitive layer coating liquid adhering to an end of a conductive support outer peripheral surface after applying the photosensitive layer coating liquid. The brush includes a cylindrical ring with a length T(mm), and a brush bristle group consisting of a plurality of brush bristles that are erected from the inner peripheral surface of the ring and have a length L(mm) and a diameter d(mm). When it is assumed that the thickness of the axial direction of the ring of the brush bristle group is t(mm), sectional secondary moment of the brush bristles is I(mm<SP>4</SP>), modulus of longitudinal elasticity of the brush bristles is E(kg/mm<SP>2</SP>), the contact width of the brush bristles with the outer peripheral surface of the conductive support is y(mm), and the degree of density of the brush bristle group is σ, a predetermined relationship is established. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method for producing an electrophotographic photosensitive member, and more particularly, to a method for producing an electrophotographic photosensitive member capable of appropriately removing a photosensitive layer coating solution adhering to an end portion of a conductive support.

  The electrophotographic photosensitive member is formed by providing a photosensitive layer on the surface of a conductive support (conductive support). That is, in the production, a photosensitive layer coating solution to be a photosensitive layer is applied to the surface of the conductive support by some method. As one of such coating methods, a so-called dip coating method is known in which a conductive support is dipped in a photosensitive layer coating solution, which is then pulled out. Following the coating, the conductive support to which the photosensitive layer coating solution is adhered is dried. According to this method, it is possible to obtain an electrophotographic photosensitive member that is easy to apply and has good uniformity of the photosensitive layer.

  Here, since both ends of the electrophotographic photosensitive member need to be electrically connected to other parts or attached with other members, it may be preferable that the above-described photosensitive layer is not formed. According to the dip coating method described above, it is possible not to form the photosensitive layer on one end (upper end) side of the conductive support because it is not necessary to immerse the photosensitive layer. However, the photosensitive layer coating solution inevitably adheres to the other end (lower end) side of the conductive support.

  Therefore, when the photosensitive layer coating solution is adhered to the conductive support by the dip coating method, a step of removing the photosensitive layer coating solution from at least one end of the conductive support is necessary after the dip coating. As such a removing means, Patent Document 1 discloses that a brush is disposed on an end portion of a conductive support from which a photosensitive layer coating solution is to be removed. According to this, it is supposed that the photosensitive layer coating solution adhering to the end portion of the conductive support can be wiped off and removed.

Japanese Patent No. 3845465

  Since the brush as described above directly contacts the conductive support and wipes off the photosensitive layer coating solution, one of the causes of the trouble is that the conductive support is scratched or the wear of the brush itself is severely worn. It was. On the other hand, if, for example, the stiffness of the brush is made too weak in order to avoid such a problem, the photosensitive layer coating solution, which is the original purpose, cannot be properly wiped off.

  Moreover, in addition to the above-mentioned matters related to the stiffness of the brush, there are also problems such as contamination of foreign matters and contact strength with the conductive support. With any brush, the wiping process is performed with reduced defects. It was difficult to judge whether it was possible.

  Accordingly, in view of the above problems, the present invention provides an electronic device capable of suppressing other problems while achieving the purpose of wiping in the step of wiping the photosensitive layer coating solution adhering to the end of the conductive support with a brush. It is an object of the present invention to provide a method for producing a photographic photoreceptor.

  The present invention will be described below. Here, for ease of understanding, reference numerals of the drawings are given in parentheses, but the present invention is not limited to this.

とし、ブラシ毛の縦弾性係数をＥ（ｋｇ／ｍｍ^２）、及びブラシ毛と導電性支持体の外周面との接触代をｙ（ｍｍ）、ブラシ毛群の密集度を、

で表わすと、

が成立することを特徴とする電子写真感光体の製造方法である。 The invention according to claim 1 is a method for producing an electrophotographic photosensitive member by applying a photosensitive layer coating solution to a cylindrical conductive support (1) and drying it, and applying the photosensitive layer to the conductive support. After applying the solution, the photosensitive layer coating solution adhering to the end of the outer peripheral surface of the conductive support has a step (S2) of wiping with a brush (40), and the brush has a cylindrical shape with a length T (mm). And a plurality of bristles (42a, 42a,...) Having a length L (mm) and a diameter d (mm) erected from the inner peripheral surface of the ring toward the center axis of the ring A bristle group (42) comprising: a thickness of the bristle group in a direction parallel to the axis of the ring t (mm), and a cross-sectional secondary moment I (mm ⁴ ) of the bristle,

And the longitudinal elastic modulus of the bristle is E (kg / mm ² ), the contact margin between the bristle and the outer peripheral surface of the conductive support is y (mm), and the density of the bristle group is

In terms of

Is a method for producing an electrophotographic photosensitive member.

とし、ブラシ毛の縦弾性係数をＥ（ｋｇ／ｍｍ^２）、及びブラシ毛と導電性支持体の外周面との接触代をｙ（ｍｍ）、ブラシ毛群の密集度を、

で表わすと、

が成立することを特徴とする電子写真感光体の製造方法である。 The invention according to claim 2 is a method for producing an electrophotographic photosensitive member by applying and drying a photosensitive layer coating solution on a cylindrical conductive support (1), and applying the photosensitive layer to the conductive support. A step of wiping off the photosensitive layer coating solution adhering to the end of the outer peripheral surface of the conductive support with a brush (40) after applying the solution, and the brush is a cylindrical ring having a length T (mm) (41), and a bristle group consisting of a plurality of brush bristles having a length L (mm) and a diameter d (mm) erected from the inner peripheral surface of the ring toward the central axis of the ring, The thickness of the bristle group in the direction parallel to the axis of the ring is t (mm), and the cross-sectional secondary moment I (mm ⁴ ) of the bristle is

And the longitudinal elastic modulus of the bristle is E (kg / mm ² ), the contact margin between the bristle and the outer peripheral surface of the conductive support is y (mm), and the density of the bristle group is

In terms of

Is a method for producing an electrophotographic photosensitive member.

  According to the present invention, at the time of wiping the edge of the conductive support, the photosensitive coating solution is appropriately removed, while damage to the conductive support is suppressed, the life of the brush hair is improved, and the brush hair group is washed. It is also possible to suppress the remaining foreign matter.

It is a flowchart explaining process S0 included in the manufacturing method of the electrophotographic photoreceptor which concerns on one embodiment. It is a figure explaining an electroconductive support body and a conveying apparatus. It is a figure explaining the attitude | position where the electroconductive support body is hold | maintained at the picker of a conveying apparatus. It is a figure explaining a dip coating process. It is a figure explaining an edge part wiping apparatus. It is a figure showing a brush. It is a figure for demonstrating a relational expression. It is another figure for demonstrating a relational expression.

  The above-described operation and gain of the present invention will be clarified from embodiments for carrying out the invention described below. Hereinafter, the present invention will be described based on embodiments shown in the drawings. However, the present invention is not limited to these embodiments.

  FIG. 1 is a flowchart for explaining step S0 included in the method of manufacturing an electrophotographic photosensitive member according to one embodiment. Step S0 includes a dip coating step S1, an edge wiping step S2, and a surface drying step S3. Before and after step S0, the same steps as those in the normal manufacturing method are arranged. For example, before the step S0, there is a cleaning / drying step (shown by a broken line in FIG. 1) of the conductive support, and after the step S0, a loading and unloading step and the like are included.

  Prior to the description of step S0, the conductive support 1 supplied to the step S0 and its transport means 10 will be described. 2 and 3 are explanatory diagrams. FIG. 2 shows a scene where the conductive supports 1, 1,... Are held by the conveying means 10, and FIG. 3 is a diagram for explaining how the conductive supports 1, 1,. In FIG. 3, the inside of the conductive support 1 is seen through for easy understanding.

  The conductive support 1 of the present embodiment has a cylindrical shape, and when functioning as an electrophotographic photosensitive member, an image or the like can be continuously transferred to a medium by rotating around the axis of the cylindrical shaft. Therefore, it is better that there is as little eccentricity as possible, the deflection is small, and the straightness is good. The outer diameter and length of the conductive support 1 are appropriate for the specifications of the image forming apparatus to which the conductive support 1 is applied. Usually, the outer diameter of the conductive support 1 is 2 cm to 20 cm and the length is long. Is often in the range of 21 cm to 100 cm.

  Although the material of the electroconductive support body 1 is not specifically limited, Since it is required to have electroconductivity, metal materials, such as aluminum, nickel, brass, stainless steel, or the lamination of these metal foils And deposits. In addition, polymer materials such as polyethylene terephthalate, polypropylene, nylon, polystyrene, and phenolic resin with conductive layers such as aluminum, copper, palladium, tin oxide, and indium oxide provided on the surface, and carbon black for these polymers It is also possible to mix them with conductivity. Furthermore, other materials such as hard paper are formed into a cylindrical shape, and a conductive material such as metal powder, carbon black, copper iodide, and polymer electrolyte is applied together with a suitable binder to conduct a conductive treatment, or oxidized. Examples thereof include a plastic drum subjected to conductive treatment with a conductive metal oxide such as tin oxide.

  The conveyance device 10 is a device that holds the conductive support 1 and moves and conveys the conductive support 1. As can be seen from FIG. 2, the transfer device 10 includes an arm 11 that can move up and down and move in the horizontal direction, and a plate-like substrate 12 provided at the tip of the arm 11. Also, a plurality of pickers 13, 13,... Are provided so as to extend downward from the lower surface of the base 12.

  As can be seen from FIG. 3, the picker 13 includes a shaft 14, and two balloon bodies 15 and 16 that expand and contract by air inflow and outflow are provided on the outer peripheral surface of the shaft 14. In addition, a guide member 17 having a thin tip is provided at the tip of the shaft 14.

  As shown in FIG. 3, the shaft 14 is inserted inside the conductive support 1, and the balloon supports 15 and 16 are expanded to hold the conductive support 1. When the shaft 14 is inserted into the inside of the conductive support 1, the balloon bodies 15 and 16 are contracted so as not to disturb the insertion. At this time, the insertion is performed smoothly with the aid of the wedge-shaped guide member 17.

  The conductive supports 1, 1,... Held by the pickers 13, 13,.

Returning to FIG. 1, each step of step S0 will be described.
The dip coating step S1 is a step of immersing the conductive support 1 in a dipping device 20 in which a photosensitive layer coating solution is stored to apply the photosensitive layer coating solution to the conductive support 1. FIG. 4 shows an explanatory diagram. As described above, the conductive supports 1, 1,... Held by the transport apparatus 10 are transported by the transport apparatus 10 to just above the immersion apparatus 20, and descend as shown by an arrow A in FIG. Soaked and then pulled up. Thereby, the photosensitive layer coating solution is applied to the outer surface of the conductive support 1.

As is clear from the description of the dip coating step S1 described above, the conductive support 1 is immersed from the lower end thereof, and therefore the photosensitive layer coating solution is attached to at least the lower end of the conductive support 1.
Moreover, in the said dip coating process S1, not only one application | coating but when there exist a some required layer, you may apply repeatedly until a required some layer is formed.

  A known device can be used as the immersion device 20 used here. For example, the dipping device 20 includes a dipping tank that is a part where the photosensitive layer coating solution is stored and the conductive support 1 is dipped, and a circulation mechanism that circulates the photosensitive layer coating solution. The photosensitive layer coating solution stored in the immersion tank is supplied from the coating solution supply port to the immersion tank and overflows from the upper part thereof. The overflowed photosensitive layer coating solution is received by the tray and sent to the coating solution tank. In the coating solution tank, the photosensitive layer coating solution is adjusted and stirred, and then sent again to the immersion layer by a supply pump.

  The photosensitive layer coating solution is formed by mixing a charge generation material, a charge transport material, a binder resin, and a coating solvent. Here, the charge generation layer coating solution composed of the charge generation material, the binder resin and the coating solvent and the charge transport layer coating solution composed of the charge transport material, the binder resin and the coating solvent are mixed separately. Become.

  Examples of charge generating materials include azo pigments such as Sudan Red, Diane Blue, and Dienas Green B, quinone pigments such as disazo pigments, algor yellow, and pyrenequinone, quinocyanine pigments, perylene pigments, indigo pigments, and bis such as Indian First Orange toner. Examples thereof include benzimidazole pigments, phthalocyanine pigments such as copper phthalocyanine, quinacridone pigments, pyrylium salts, and azulenium salts.

  Charge transport materials include polyaromatic compounds such as anthracene, pyrene, phenanthrene and coronene in the main chain or side chain or indole, carbazole, oxazole, isoxazole, thiazole, imidazole, pyrazole, oxadiazole, pyrazoline, thiadiazole, triazole Examples thereof include compounds having a skeleton of a nitrogen-containing cyclic compound such as, and hole transport materials such as hydrazone compounds.

  Examples of the binder resin for forming the photosensitive coating film include polycarbonate, polyarylate, polystyrene, polymethacrylic acid esters, styrene-methyl methacrylate copolymer, polyester, styrene-acrylonitrile copolymer, polysulfone, etc., polyvinyl acetate, polyacrylonitrile. , Polyvinyl butyral, polyvinyl pyrrolidone, methyl cellulose, hydroxymethyl cellulose, cellulose esters and the like.

  As the solvent, a solvent having high volatility and a vapor density higher than that of air is preferably used. For example, n-butylamine, diethylamine, ethylenediamine, isopropanolamine, triethanolamine, N, N-dimethylformamide , Acetone, methyl ethyl ketone, cyclohexanone, benzene, 4-methoxy-4-methylpentanone-2, dimethoxymethane, dimethoxyethane, 2,4-pentadione, anisole, methyl 3-oxobutanoate, monochlorobenzene, toluene, xylene, chloroform, 1,2-dichloroethane, dichloromethane, tetrahydrofuran, dioxane, methanol, ethanol, isopropanol, ethyl acetate, butyl acetate, dimethyl sulfoxide, methyl cellosolve, ethyl cellosolve Methyl cellosolve acetate, and the like.

  The concentration of each component in the photosensitive layer coating solution is appropriately selected according to a known method. The concentration of the solid content is mainly determined according to the film thickness of the layer to be formed. In the case of a coating solution for producing a single-layer type electrophotographic photosensitive member, a laminated type electrophotographic photosensitive member is produced. In the case of the photosensitive layer coating solution for the charge transport layer, the amount is adjusted to 40% by mass or less, preferably 10% to 35% by mass. In the case of these coating solutions, the viscosity is 50 cps to 300 cps, preferably 70 cps to 250 cps, and the dry film thickness is 15 μm to 40 μm.

  Returning to FIG. 1, the edge wiping step S2 will be described. The edge wiping step S2 is a step of wiping off the photosensitive layer coating solution adhering to the end of the conductive support 1 from the photosensitive layer coating solution applied in the dip coating step S1. FIG. 5 shows an explanatory diagram.

  In the end wiping step S2, as can be seen from FIG. 5, the end of the conductive support 1 is inserted into the end wiping device 30, and the photosensitive layer coating solution at the end is removed by the brush 40 provided therein. .

The end wiping device 30 includes a base 31, and a guide 32 is erected on the upper surface of the base 31. A groove 33 is formed on the upper surface of the base 31 according to the shape of the end of the conductive support 1, and the brush 40 is disposed on the inside thereof. That is, the conductive support 1 coated with the photosensitive layer coating solution is positioned by inserting the guide 32 inside the cylindrical inside thereof, and the end portion is in the groove 33. Then, the photosensitive layer coating solution at the end can be wiped off by the rotation of the brush 40.
Here, the wiping device 30 is immersed in a wiping liquid tank before the conductive support 1 is inserted, and the brush 40 contains the wiping liquid while being cleaned in the liquid while rotating in the liquid. It is supposed to be in a state.

Hereinafter, the brush 40 will be described in more detail. FIG. 6 shows the brush 40. 6A is a perspective view of the brush 40, FIG. 6B is a plan view of the brush 40, and FIG. 6C is a sectional view taken along VIc-VIc in FIG. 6B. However, in FIG. 6C, it is shown in an enlarged manner as compared with FIG.
The brush 40 has a cylindrical ring 41 having a length T, and a plurality of brush bristles 42a, 42a extending from the inner peripheral surface of the ring 41 toward the ring central axis of the ring 41 (FIG. 6C). The brush bristle group 42 is configured. In the figure, each brush hair 42a, 42a,... Cannot be represented one by one, and is shown as a brush hair group 42.

  The ring 41 is a cylindrical member having a length T. The material of the ring 41 is not particularly limited, but is preferably a metal because it preferably has predetermined rigidity and strength. Among these, stainless steel is more preferable from the viewpoint of rust prevention and cleanability.

The bristle group 42 is a set of brush bristles 42a, 42a,... Having a length L and a wire diameter d (see FIG. 7) provided from the inner peripheral surface of the ring 41 toward the central axis of the ring 41. . Since the length L of the brush hairs 42a, 42a,... Is shorter than the inner radius of the ring 41, the brush hair group 42 also has a ring shape as can be seen from FIGS. 6 (a) and 6 (b). As shown in FIG. 6C, the thickness of the bristle group 42 (the length in the direction parallel to the axis of the ring 41) is t.
The brush hairs 42a, 42a,... Are not particularly limited as long as the material can satisfy the formula (1) described later, but from the viewpoint that it is difficult to damage the cleaning property and the conductive support 1, It is preferable that it is resinous. Among these, nylon, polybutylene terephthalate (PBT), polypropylene and the like can be used from the viewpoint of availability and performance.

  Further, the brush 40 satisfies the following expression (1) in relation to the conductive photoreceptor 1 to be wiped off.

Here, E is the longitudinal elastic modulus (kg / mm ² ) of the bristle 42a, I is the cross-sectional secondary moment (mm ⁴ ) of the bristle 42a, and σ is the density of the bristle group 42 expressed by t / T ( t is the thickness (mm) of the brush bristle group 42, T is the length (mm) of the ring 41, L is the length (mm) of the brush bristle group 42, and y is the brush. The contact allowance (mm) between the bristle group 42 and the outer peripheral surface of the conductive photoconductor is shown. More specifically, the cross-sectional secondary moment I (mm ⁴ ) and the contact allowance y (mm) will be described.

The cross-sectional secondary moment I (mm ⁴ ) is obtained by the equation (2) using the length T (mm) of the ring 41 and the wire diameter d (mm) of the brush bristles 42a. FIG. 7 is an explanatory diagram.

  As shown in FIG. 7A, which is a view corresponding to FIG. 6C, it is assumed that the bristle group is arranged over the entire length (ie, length T) of the inner surface of the ring (T = t). At this time, as shown in the perspective view of FIG. 7B, attention is paid to one row of brush hairs along the length T of the ring. Considering the deformation of the brush when the conductive support is inserted inside the brush and the brush is rotated (see FIG. 8A), one row of the bristle is taken as one unit, and FIG. It is preferable to consider the cross-sectional second moment of the cross section viewed from the direction indicated by B in FIG. Therefore, the cross-sectional second moment of the rectangular cross section shown in FIG. 7C is expressed by the equation (2).

  On the other hand, the contact allowance y (mm) is shown in FIG. Because of the nature of the brush 40, as shown in FIG. 8A, when the conductive support 1 is inserted inside the brush 40 and the brush 40 is rotated, the tips of the brush hairs 42a, 42a,. The surface of the conductive support 1 is contacted. y represents the amount of contact. Specifically, as can be seen from FIG. 8B, from the length L (mm) of the brush bristles 42a, the distance between the inner surface of the ring 41 and the outer surface of the conductive support 1 (x ( The size obtained by subtracting mm)) is y (mm).

  Next, derivation of the following equation (3) included in the above equation (1) will be described.

  Equation (3) can be derived by determining the load on the brush hair. Details are as follows. As shown in FIG. 8B, the deflection ν (mm) when the conductive support 1 is inserted into the brush 40 and the brush 40 is rotated is expressed as w (kg). Then, it can represent by Formula (4) using a cross-sectional secondary moment.

  On the other hand, from FIG. 8B, the deflection ν (mm) can be approximately expressed by the equation (5).

  When the load w (kg) is obtained from the equations (4) and (5), the equation (6) is obtained.

Here, since the cross-sectional secondary moment I (mm ⁴ ) is calculated as T = t as described above, it is multiplied by σ (= t / T) in order to reflect the actual density of the bristle. The above formula (3) can be derived.

As can be seen from the equation (1), the lower limit of the equation (3) is 2 × 10 ⁻⁴ (kg), and the upper limit is 4 × 10 ⁻⁴ (kg). Preferably, the lower limit is 2.5 × 10 ⁻⁴ (kg), and the upper limit is 3.5 × 10 ⁻⁴ (kg).

  According to the edge wiping step S2 having the above-described conditions, when wiping the edge of the conductive support 1, the photosensitive support liquid is appropriately removed and the damage to the conductive support 1 is suppressed. It is possible to improve the life of the brush bristles 42a, 42a,... And to prevent residual foreign matter after the brush group 42 is cleaned.

Returning to FIG. 1, the surface drying step S3 will be described. The surface drying step S3 is a step of drying the photosensitive layer coating solution coated on the surfaces of the conductive supports 1, 1,. In the surface drying step S3, the drying temperature and time may be adjusted so that necessary and sufficient drying is performed. The drying temperature is usually 100 ° C to 250 ° C, preferably 110 ° C to 170 ° C, more preferably 120 ° C to 140 ° C. Here, the temperature during drying refers to the surface temperature during drying of the coated photoreceptor. If the temperature difference from the boiling point of the low-boiling solvent is small, drying takes a relatively long time, but there is little possibility that the active components in the photosensitive layer will be decomposed or altered. As drying conditions, in addition to drying in one stage, for example, a method of drying in two stages can be used. In this case, the drying temperature of the first stage is 50 ° C. to 150 ° C., preferably 70 ° C. to 120 ° C., and the drying temperature of the second stage is higher than the first stage, usually 100 ° C. to 250 ° C., preferably 110 ° C. It is preferable to adjust the drying time so that necessary and sufficient drying is performed at ˜170 ° C., more preferably at 120 ° C. to 140 ° C. When changing the drying temperature, such as two-stage drying, on the basis of the maximum temperature during drying, a solvent having a higher boiling point and a lower solvent than the maximum temperature are selected.
As a drying means, a hot air dryer, a steam dryer, an infrared dryer, a far infrared dryer, or the like can be used.

  Hereinafter, the present invention will be described in more detail with reference to examples. In the embodiment, the condition included in the expression (3) is changed, the expression (3) is calculated, and it is determined whether the expression (1) is satisfied, and the end wiping of the conductive support is performed under the condition. We investigated the results. Table 1 shows the conditions and results. In Table 1, “Establishment of Formula (1)” is defined as “◯” when Formula (1) is met, and “X” when not established. In addition, the “wiping status” is “◎” when the surface of the conductive support after wiping the edge was visually observed and no scratches on the surface and no wiping residue were observed. The case where the photosensitive layer coating solution was wiped off was indicated as “◯”, and the case where there was a scratch on the surface or there was a remaining wiping exceeding the allowable range was indicated as “X”.

As can be seen from Table 1, the wiping condition is also good under the condition where the expression (1) is satisfied, and the wiping result is problematic under the condition where the expression (1) is not satisfied. Among them, it was particularly good at 2.5 × 10 ⁻⁴ (kg) or more and 3.5 × 10 ⁻⁴ (kg) or less.

  Although the present invention has been described with reference to embodiments that are presently practical and preferred, the present invention is not limited to the embodiments disclosed herein, Changes can be made as appropriate without departing from the spirit or concept of the invention that can be read from the claims and the entire specification, and a method of manufacturing an electrophotographic photosensitive member involving such changes is also included in the technical scope of the present invention. It must be understood as a thing.

DESCRIPTION OF SYMBOLS 1 Conductive support body 10 Conveyance apparatus 11 Arm 12 Base body 13 Picker 14 Shaft 15 and 16 Balloon body 17 Guide member 20 Immersion coating apparatus 30 End wiping apparatus 31 Base 32 Guide 33 Groove 40 Brush 41 Ring 42 Brush hair group 42a Brush hair

Claims (2)

A method for producing an electrophotographic photosensitive member by applying a photosensitive layer coating solution to a cylindrical conductive support and drying it,
After applying the photosensitive layer coating solution to the conductive support, the step of wiping the photosensitive layer coating solution adhering to the end of the outer peripheral surface of the conductive support with a brush,
The brush is a cylindrical ring having a length T (mm), and a plurality of lengths L (mm) and diameters d (mm) erected from the inner peripheral surface of the ring toward the center axis of the ring. A group of brush bristles made up of
The thickness of the bristle group in the direction parallel to the axis of the ring is t (mm), and the cross-sectional secondary moment I (mm ⁴ ) of the bristle is

And the longitudinal elastic modulus of the bristle is E (kg / mm ² ), the contact margin between the bristle and the outer peripheral surface of the conductive support is y (mm), and the density of the bristle group is

In terms of

A method for producing an electrophotographic photosensitive member, wherein: A method for producing an electrophotographic photosensitive member by applying a photosensitive layer coating solution to a cylindrical conductive support and drying it,
After applying the photosensitive layer coating solution to the conductive support, the step of wiping the photosensitive layer coating solution adhering to the end of the outer peripheral surface of the conductive support with a brush,
The brush is a cylindrical ring having a length T (mm), and a plurality of lengths L (mm) and diameters d (mm) erected from the inner peripheral surface of the ring toward the center axis of the ring. A group of brush bristles made up of
The thickness of the bristle group in the direction parallel to the axis of the ring is t (mm), and the cross-sectional secondary moment I (mm ⁴ ) of the bristle is

And the longitudinal elastic modulus of the bristle is E (kg / mm ² ), the contact margin between the bristle and the outer peripheral surface of the conductive support is y (mm), and the density of the bristle group is

In terms of

A method for producing an electrophotographic photosensitive member, wherein:

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