JPH07104485A - Washing method for electrophotographic photoreceptor - Google Patents

Abstract

PURPOSE:To provide a processing method for efficiently producing a substrate having surface almost free from an image defect such as a dark point and local fog due to a flay or the like on the surface of an electrophotographic photoreceptor. CONSTITUTION:The characteristic point of this method is that the surface of an electrophotographic photoreceptor substrate 1, while being supplied with aqueous cutting fluid, is cut with a bite 8 made of monocrystal diamond and, then, (1) the substrate 1 is washed with water or washing liquid composed of the water solution of an interfacial active agent, or (2) the substrate 1 is washed with a water soluble organic agent having a boiling point equal to or lower than 120 deg.C and a dielectric constant equal to or above 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating the surface of an electrophotographic photoreceptor substrate, and more particularly to a method for cleaning an electrophotographic photoreceptor substrate made of an aluminum material.

[0002]

2. Description of the Related Art In electrophotographic copying machines, digital copiers, laser printers, etc., an electrophotographic photosensitive member having a photosensitive layer provided on a rotating drum-shaped electrophotographic photosensitive member substrate (hereinafter appropriately referred to as "substrate"). Is widely used. As a material for the base material constituting such an electrophotographic photoreceptor, an aluminum-based material is preferably used because of its advantages such as low cost, light weight, and easy processing. The rotary drum-shaped substrate made of this aluminum-based material is generally finished by cutting the surface of a tubular material, and a cutting fluid is usually used during this cutting. This cutting fluid is used for the purpose of cooling action, lubricating action, cleaning action, etc. Specifically, petroleum-based, polybutene-based, kerosene, white kerosene, etc. are used. Further, in order to prevent the occurrence of image defects, it is also practiced to clean the surface of the substrate by a contact type cleaning means using a brush, an abrasive or the like after cutting the substrate.

The followings have been proposed as specific techniques related to the method of treating the surface of the electrophotographic photosensitive member substrate.

(1) 1.0% oiliness improver or extreme pressure additive
A technique for processing an electrophotographic photosensitive member substrate by using a cutting oil containing less than or equal to wt% (Japanese Patent Laid-Open No. 63-307463).

(2) A technique of finishing the surface of an electrophotographic photosensitive member substrate made of an aluminum alloy containing magnesium, silicon, copper and titanium in a specific range of ratios with a cutting tool having a rounded cutting portion 64-86151).

(3) A technique using an electrophotographic photoreceptor substrate made of an aluminum alloy containing silicon and iron in a specific range of ratio (JP-A-64-86152).

(4) A technique for finishing the surface of an electrophotographic photoreceptor substrate made of an aluminum alloy containing magnesium, silicon and copper in a specific range by a cutting tool having a rounded cutting portion (Japanese Patent Laid-Open No. 64-64- 86153).

(5) A technique using an electrophotographic photoreceptor substrate made of an aluminum alloy containing silicon, magnesium and iron in a specific range of ratio (Japanese Patent Laid-Open No. 64-86154).

(6) A technique using an electrophotographic photoreceptor substrate made of an aluminum alloy containing magnesium, silicon, copper and titanium in a specific range of ratios (Japanese Patent Laid-Open No. 64-86155).

(7) A technique using an electrophotographic photoreceptor substrate made of an aluminum alloy containing silicon, iron and magnesium in a specific range of ratios and other metals in a specific ratio or less (Japanese Patent Laid-Open No. 1-123245). .

(8) A surface processing apparatus comprising a lathe unit, a high-pressure liquid jet processing unit, and a transfer unit for the electrophotographic photosensitive member substrate, which is capable of continuously and automatically performing lathe processing and high-pressure jet processing. (Japanese Patent Application Laid-Open No. 1-1725
No. 73).

(9) A technique using a specific cutting fluid supply nozzle device having a spindle head rotatably supporting a spindle provided with a rotary tool having an oil hole and a rotary tool having no oil hole (JP-A-62-62) -152642 publication).

(10) While jetting high-pressure water onto the surface of the electrophotographic photoconductor substrate from the jet holes of the nozzle connected to the supply source of high-pressure water, the nozzle is scanned along the surface of the substrate. A technique for roughening the surface of the substrate to a predetermined surface roughness (Japanese Patent Laid-Open No. 63-264764).

(11) After the surface of the electrophotographic photosensitive member substrate made of an aluminum-based material is cut with a diamond cutting tool while spraying cutting oil, the surface of the substrate is cleaned by a contact type cleaning means using a brush or an abrasive. A technique for preventing occurrence of image defects by cleaning (Japanese Patent Laid-Open Nos. 2-201373 and 2-919963).

[0015]

However, in the above-mentioned prior art, the aluminum cutting powder, the aluminum cutting powder, is formed on the surface of the substrate made of the aluminum-based material surface-treated by using the cutting oil.
Environmental foreign matter such as dust and dirt, rust and the like may be firmly adhered to the substrate in a state of being taken in by the cutting oil, and if this state is left for a long period of, for example, one month or more,
Especially under high temperature and high humidity in summer, the above-mentioned deposits become more firmly fixed and partial corrosion (rust) occurs on the surface of the substrate, and this corrosion may not be visually recognizable. is there.

Such corrosion may be caused by immersion in an organic solvent or a surfactant solution, ultrasonic cleaning or ultraviolet / O ₃
It cannot be completely removed by a non-contact type cleaning means such as cleaning. Therefore, when an electrophotographic photosensitive member is formed by providing a photosensitive layer on the surface of a substrate having such corrosion, an image defect occurs in the corroded portion, and it is obtained particularly when applied to an image forming process employing a reversal development method. There is a problem that black spots, black stripes, and local fog occur in the image.

Partial corrosion on the surface of the substrate can be removed to some extent by cleaning the surface of the substrate with a contact type cleaning means using a brush or an abrasive, but depending on the aluminum material, the surface of the substrate may be corroded. On the contrary, since the film thickness of the photosensitive layer, particularly the carrier generation layer, formed on the scratched portion is likely to change, the photosensitivity of the photosensitive layer changes, and a contrast occurs in the halftone image, resulting in image defects. There is a problem. Furthermore, the surface roughness is 0.3-2.0 μm Rmax, and the length is within 0.1 mm.
In the case of a base made of aluminum-based material having 15 to 15 micro-roughness, oil, cutting powder, environmental foreign matter, etc. enter into the recesses of micro-roughness, and they stick when left unattended. Since it cannot always be removed with only the abrasive, it may cause an image defect, and an electrophotographic photosensitive member substrate of good quality may not be obtained in some cases.

Further, in the case of a substrate made of an aluminum-based material which has been surface-treated using cutting oil as in the prior art,
In order to remove the cutting oil sufficiently, Freon 11, 112, 113
Must be washed with a chlorinated solvent such as CFCs, trichloroethylene, 1,1,1-trichloroethane, perchlorethylene, methylene chloride, etc. However, the use of a large amount of such a solvent has problems in environmental pollution and work safety from the viewpoints of ozone layer depletion, carcinogenicity, and the like.

Further, in the above technique (10), the substrate surface is processed while jetting high-pressure water, and it is difficult to uniformly process the metal surface with only high-pressure water. There is.

Therefore, an object of the present invention is to provide a surface treatment method capable of obtaining an electrophotographic photosensitive member substrate which can be easily washed without using a CFC or a chlorine-based solvent and has few image defects. It is in.

[0021]

SUMMARY OF THE INVENTION An object of the present invention is to cut a surface of an electrophotographic photoreceptor substrate made of an aluminum-based material with a cutting tool made of single crystal diamond while supplying a water-based cutting fluid to the surface. After that, the substrate is cleaned with a cleaning liquid composed of water or an aqueous solution of a surfactant, or a method of cleaning an electrophotographic photosensitive substrate comprising an aluminum-based material, or water-based cutting on the surface of the substrate. While supplying the liquid, after cutting the surface of the substrate with a cutting tool made of single crystal diamond, the substrate is washed with a water-soluble organic solvent having a boiling point of 120 ° C or less and a relative dielectric constant of 18 or more. And a method of cleaning an electrophotographic photosensitive member substrate.

Specific examples of the water-based cleaning liquid include pure water, tap water, anionic, cationic, nonionic, amphoteric surfactant aqueous solutions and the like.

The water-soluble organic solvent refers to a solvent having a solubility (gram of solute / gram of solvent) of 50 or more, and specific examples thereof include methanol, ethanol, n-propanol, isopropanol, sec-butanol. ,acetone,
Examples include alcohol-based solvents such as acetonitrile and ketone-based solvents.

By using the water-based cutting fluid, it is possible to effectively prevent aluminum cutting powder, environmental foreign matters such as dust and dirt from adhering to and adhering to the substrate surface. Even if an adhering substance is generated, it is not firmly fixed so that subsequent washing is facilitated, and the adhering substance can be favorably washed with an aqueous surfactant solution having a surface tension of a specific value or less. Therefore, the productivity is improved by reducing the number of cleaning steps, and since it is less necessary to perform contact-type cleaning with a brush or an abrasive, there is less possibility of causing scratches on the substrate surface. Moreover, since it is not necessary to use CFCs or chlorine-based solvents for cleaning, environmental pollution and work safety problems do not occur. Also, when CFCs or chlorine-based solvents are used as the cleaning liquid, they may remain on the substrate after cleaning, causing image defects,
In particular, a chlorine-based solvent reacts with water to generate hydrochloric acid, which causes a problem of causing pitting corrosion on the surface of a substrate made of an aluminum-based material, but the present invention does not cause these problems.
In addition, the cost of the cutting fluid can be reduced, and since the water-based cutting fluid has a higher cooling effect than the oil-based cutting fluid, the life of the cutting tool can be extended.

[0025]

In the surface treatment method of the present invention, the surface of the electrophotographic photosensitive member substrate made of an aluminum-based material is cut with a cutting tool made of a single crystal diamond sintered body while supplying an aqueous cutting liquid to the surface. After that, the surface of the substrate is washed with a washing liquid containing water or a surfactant aqueous solution.

Aluminum-based materials include A1070, A1100, A3003, A5005, A5805, which are specified by JIS.
A6063 or the like is used. The form of the substrate is not particularly limited, and may be in the form of a rotating drum or an endless seat belt.

Although a water-based cutting fluid is used as the cutting fluid, it is preferable to supply the water-based cutting fluid to the surface of the substrate in a mist form using, for example, "Magic Cut" manufactured by Fuso Seiki Co., Ltd. The mist shape effectively prevents solid adhesion of cutting powder and environmental foreign matter generated during cutting to the surface of the substrate, and is easy to remove even if the cutting powder enters the concave portion of minute roughness. . Further, since the cutting powder and the like do not firmly adhere to the surface of the substrate, cleaning becomes easy. Also,
Even if it is left for a long period of time, there is no possibility that cutting powder or environmental foreign matter will firmly adhere to the substrate surface. Furthermore, during surface processing,
Since a uniform and durable oxide film is formed on the surface of the substrate made of an aluminum-based material by the mist-like water-based cutting fluid, the surface condition of the substrate is stable and there is no possibility of partial corrosion.

The supply amount of the water-based cutting fluid is good
From the viewpoint of obtaining a lubricating action and a washing action, it is preferably 0.003 ml / cm ² or more.

Specific examples of the water-based cutting fluid include pure water, tap water, anionic, cationic, nonionic and amphoteric surfactant aqueous solutions, water-soluble organic solvents such as alcohol-based and ketone-based solvents, or these. And a mixture of water and the like.

In the present invention, a cutting tool made of single crystal diamond is used as the cutting tool. In rough machining,
Ordinary polycrystalline diamond is used, but it is preferable to use a cutting tool which is a single crystal diamond and has a radius R of the nose of 20 mm or more for finishing. By using a nose with a large radius R,
The maximum height Rmax in the feed pitch of the cutting tool becomes small, and the machined surface becomes a shape that is easily cleaned. That is,
The maximum height Rmax is small and the pitch is large.
Also, by increasing the radius R of the roundness of the nose,
When the maximum height Rmax is the same, the feed pitch of the cutting tool can be increased, which is also effective for takt time.

Here, the maximum height Rmax is JIS B0601-19
It was measured according to 82. The measuring instrument used is
It is a "surface roughness measuring instrument SE-30H" (manufactured by Kosaka Laboratory) which is a stylus type surface roughness measuring instrument specified in JIS B0651, and the nominal radius of curvature of the tip of the stylus used is 2 µm.

As the conditions of the surface processing, in the rough processing, the spindle rotational speed is 2000 to 6000 rpm, the depth of cut is 0.1 to 0.2 mm, the feed pitch is 0.2 mm / rev, and in the finishing processing, the spindle rotational speed is 2000 to 6000 rpm. 6000 rpm, depth of cut 20 μm, feed pitch
0.2mm / rev is recommended. The spindle rotation speed cannot be unconditionally specified because it depends on the outer diameter of the tubular substrate.

In the present invention, it is particularly preferable to perform cutting so that the surface roughness of the substrate is 0.3 to 1.0 μmRmax. Further, on the surface of the base body, the length of the feed per one rotation (feed pitch) in the feed direction of the cutting tool is caused by the grain size of the single crystal diamond constituting the cutting tool.
It is preferable to perform cutting so that 40 minute roughnesses exist.

Here, the fine roughness is the maximum height Rma mentioned above.
It is measured in the same way as the measurement of x, and the fineness of the microroughness that can be measured varies depending on the tip curvature radius of the stylus used, but in one example, the nominal tip radius of curvature is 2 μm. Needles are used.

The machine tool that can be used for cutting the substrate is not particularly limited, but examples include a lathe for substrate processing shown in FIG. In FIG. 1, 1 is a drum-shaped substrate, 2 is a magnet base, 3 is a holder, 4 is an atomizer, 5 is a spray nozzle, 6 is a cutting fluid container, 7 is an operating air valve, and 8 is a cutting tool. When the operator steps on the operation air valve 7 with air, air is sent to the atomizer 4, and the mist-like water-based cutting fluid is jetted from the spray nozzle 5 of the cutting fluid container 6 to the contact portion between the cutting tool 8 and the base 1. To be done. As a specific example of the cutting liquid spraying device, "Magic Cut" (manufactured by Fuso Seiki Co., Ltd.) can be mentioned. FIG. 2 is an enlarged view of the cutting fluid spraying device.

The machined substrate is then subjected to a cleaning step. In the present invention, the surface of the substrate is cleaned with a cleaning solution composed of an aqueous surfactant solution having a surface tension of 40 dyne / cm or less. According to the cleaning method using an aqueous solution of a surfactant, there is no environmental hygiene problem when using CFCs or chlorine-based solvents, and there is a problem of image defects when a brush or abrasive is used to rub strongly. Does not occur. In particular, when CFCs or chlorine-based solvents are used as the cleaning liquid, water stains remain on the substrate after cleaning, causing image defects.Especially chlorine-based solvents react with water to generate hydrochloric acid. However, there is a problem that the surface tension of the substrate made of an aluminum-based material causes pitting corrosion, but these problems do not occur in the present invention.

As the surfactant, an anionic surfactant such as higher alkyl sulfonate, higher alcohol sulfate ester salt, phosphate ester salt, carboxylate salt, benzalkonium chloride, sabamin type quaternary ammonium salt, Examples thereof include pyridinium salt and amine salt type cationic surfactants, amino acid type and betaine type amphoteric surfactants, polyethylene glycol type, polyhydric alcohol type nonionic surfactants and the like. These may be appropriately mixed and used.

The surface tension of the aqueous surfactant solution is 40 dyne /
It must be below cm. An aqueous solution of a surfactant having a small surface tension has a small surface activity and therefore exhibits excellent detergency. Here, the "surface tension" is measured by "Wilhelmy type surface tensiometer A-3 type" (using platinum plate, 25 ° C) manufactured by Kyowa Kagaku.

The cleaning method is not particularly limited,
Specifically, the following method can be mentioned.

(1) Means for ultrasonic cleaning by immersing the substrate in an aqueous surfactant solution.

(2) Means for immersing the substrate in an aqueous solution of a surfactant and lightly rubbing the substrate surface with a sponge or a brush.

(3) Means of immersing in a surfactant aqueous solution.

The above cleaning means may be used in combination as appropriate.

After washing with the aqueous surfactant solution, a drying step is carried out, but the drying means is not particularly limited. For example, hot water pull-up drying, isopropanol drying, steam drying and the like are used.

The electrophotographic photosensitive member substrate surface-treated by the method of the present invention is used for constituting an electrophotographic photosensitive member used in an electrophotographic copying machine, a digital copier, a laser printer, etc. The photoreceptor is constituted by providing an organic photosensitive layer including a carrier generating layer and a carrier transporting layer on the surface of the substrate, for example.

[0046]

EXAMPLES Hereinafter, more specific examples will be described, but the present invention is not limited to these examples.

Example 1 The surface of the substrate was cut with a cutting tool while supplying the cutting fluid to the surface of the substrate under the following conditions.

(1) Substrate A substrate made of an aluminum material having an outer diameter of 60 mm
A rotating drum-shaped substrate made of A40S (6000 series) manufactured by Kobe Steel, Ltd. having a length of 273 mm was used. In addition, this A40S
In addition to aluminum, magnesium is 0.55% by weight, silicon is 0.12% by weight, iron is 0.05% by weight, titanium is 0.
The content is 01% by weight, 0.01% by weight zinc, and 0.01% by weight or less manganese.

(2) Cutting fluid Tap water having a specific resistance of 5 kΩ / cm was used.

(3) The cutting fluid was supplied at a rate of 0.003 ml / cm ² .

(4) Machine tool The lathe for substrate processing shown in FIG. 1 equipped with "Magic Cut" (manufactured by Fuso Seiki Co., Ltd.) as a spraying device for cutting fluid was used.

(5) Tool Bit For roughing, a tool bit composed of a polycrystalline diamond sintered body having a nose R of 3 mm and a grain size of 5 μm was used.

In the finishing process, a bite made of a flat single crystal diamond was used.

(6) Machining conditions In rough machining, the spindle speed is 3000 rpm and the feed pitch is 0.2 mm.
/ Rev, the depth of cut was 0.2 mm.

In the finishing process, the spindle speed is 3000 rpm,
The feed pitch was 0.2 mm / rev and the depth of cut was 20 μm. As described above, the surface of the substrate cut and processed was washed in the following manner to obtain a surface-treated electrophotographic photosensitive substrate.

(1) The surface tension of the aqueous surfactant solution is
Using 28 dyne / cm sodium lauryl sulfate aqueous solution,
Ultrasonic cleaning (frequency 28 kHz) was performed using an ultrasonic cleaning device (600 W) manufactured by Sonic Fellow.

(2) Next, pure water was used to perform ultrasonic cleaning (frequency: 200 kHz) with the above ultrasonic cleaning device.

(3) Then, the substrate was immersed in pure water.

(4) Further, using a warm pure water pulling device manufactured by Sonic Fellow, a pulling speed of 15 mm / min and a temperature of 60
Hot water was pulled up and dried under the condition of ° C.

Examples 2 to 11 Surface-treated electrophotographic photoreceptor substrates were obtained in the same manner as in Example 1 except that the conditions shown in Table 1 below were used. However,
A to K described in the column of the cleaning liquid in Table 1 represent the following.

A: Aqueous solution of sodium lauryl sulfate (surfactant) B: Sapamine MS (cationic surfactant, manufactured by Ciba)
Aqueous solution C: Aqueous solution of ethylene oxide 15 mol of stearic acid (surfactant) D: Aqueous solution of stearyl dimethyl betaine (surfactant) E: Aqueous solution of RBS48S (mixture of surfactant and inorganic, manufactured by Junsei Chemical Co., Ltd.) F: Ion-exchanged water G: Aqueous solution of sodium ularyl sulfate (surfactant) (1/2 concentration of A) H: Sapamine MS (Positive ion surfactant, made by Cide) aqueous solution (1/2 concentration of B) I : Aqueous solution of 15 mol of ethylene oxide stearate (surfactant) (1/2 concentration of C) J: Aqueous solution of stearyl dimethyl betaine (surfactant) (1/2 concentration of D) K: RBS48S (Surfactant) Aqueous solution (mixture of agent and inorganic, manufactured by Junsei Chemical Co., Ltd.) (1/2 concentration of E) Comparative Examples 1 to 11 Example 1 except that the conditions shown in Tables 1 and 2 below
A surface-treated electrophotographic photoreceptor substrate was obtained in the same manner as in.

"D 110" described in the column of cutting fluid in Table 2
Is a water-insoluble cutting fluid containing 54% of paraffinic hydrocarbons and 46% of naphthenic hydrocarbons.

In the table, tap water having a specific resistance of 5 kΩ / cm is used, and a single crystal means a single crystal diamond bite.

[0064]

[Table 1]

[0065]

[Table 2]

Evaluation of Actual Copy Using the electrophotographic photosensitive member substrates obtained in the above Examples and Comparative Examples, an undercoat layer, a carrier generating layer and a carrier transporting layer were sequentially laminated in the following manner to separate the functions. An electrophotographic photoreceptor having an organic photosensitive layer having a two-layer structure of a mold was produced.

(1) Undercoat layer Toluene and 2-butanone (MEK) were used as coating solvents, and Erbax 4260 (ethylene copolymer) was used as a binder, and dried on an electrophotographic photosensitive substrate. An undercoat layer having a film thickness of 0.2 μm was provided later.

(2) Carrier Generation Layer 2-butanone (MEK) was used as a coating solvent, KR-5240 (silicone resin) was used as a binder (solution), and τ-type metal-free phthalocyanine was used as a carrier generation material. Adhesion amount after drying on subbing layer is 4 mg / dm
^Two carrier generation layers were provided.

(3) Carrier Transport Layer 1,2-Dichloroethane was used as the coating solvent, Iupilon Z-200 (polycarbonate BPZ) was used as the binder, and ED-485 (styryltriphenylamine type) was used as the carrier transport material. Irganox-1010 (pentaerythryl-tetrakis [3- (3,5-
Di-tert-butyl-4-hydroxyphenyl) propionate]) as a silicone oil KF-54
(1/10 diluted solution) was used to provide a carrier transport layer having a film thickness after drying of 20 μm on the carrier generation layer.

Each of the above electrophotographic photoconductors was mounted on a laser printer "LP3115" manufactured by Konica Corporation, and a real-image test was conducted to form an image on A4 size plain paper by the reversal development method, and the image quality was evaluated. The charging voltage (V _H ) was set to 450 V so that black spots, black stripes, and local fog were likely to occur. In addition, the evaluation of the image quality is ◎ when no black spots, black stripes, and local fog occur, ◯ when there are some black spots but no fog, and × when black spots, black stripes, and fog occur. did. The above results are shown in Table 1 and Table 2.
Are also shown.

Example 12 The surface of the substrate which had been cut in the same manner as the substrate No. 1 was washed as follows to obtain an electrophotographic photosensitive substrate.

(1) Boiling point as a water-soluble organic solvent is 64.1 ° C.
Ultrasonic cleaning (frequency 28 kHz) was performed at a temperature of 50 ° C using methanol with a relative dielectric constant of 32.0.

(2) Further, ultrasonic cleaning (frequency 40 kHz) was performed at a temperature of 25 ° C.

(3) Thereafter, the substrate was dried with steam at a temperature of 74.1 ° C.

Examples 13 to 16 Surface-treated electrophotographic photoreceptor substrates were obtained in the same manner as in Example 12 except that the conditions shown in Table 3 below were used. However,
A to E and a to c described in the column of the cleaning liquid in Table 3 represent the following.

A: Methanol B: Ethanol C: 1-Propanol D: Isopropanol E: Acetone a: 1-Butanol b: sec-Butanol c: Ethylene glycol monoethyl ether Comparative Examples 12 to 14 The conditions are shown in Table 3 below. Other than the above, a surface-treated electrophotographic photosensitive member substrate was obtained in the same manner as in Example 12.

[0077]

[Table 3]

Evaluation of Actual Image An actual image test was conducted in the same manner as the evaluation method whose results are shown in Tables 1 and 2 above. The results are shown in Table 3.

[0079]

As described in detail above, according to the surface treatment method of the present invention, since the water-based cutting fluid is used in the cutting process, the surface of the substrate such as aluminum cutting powder, environmental foreign matters such as dust and dust, etc. Effectively prevents welding and sticking of
In the washing process, water or a surfactant aqueous solution, or a water-soluble organic solvent having a specified boiling point and relative dielectric constant is used as the washing liquid, so that good washing properties are exhibited and when a CFC or chlorine-based solvent is used. The problem of environmental pollution, work safety and pitting corrosion does not occur, and an electrophotographic photoreceptor substrate having few image defects such as black spots, black lines, black stripes, and local fog can be obtained.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a lathe for processing a substrate.

FIG. 2 is an enlarged perspective view of a cutting fluid spraying device.

[Explanation of symbols]

 1 Base 2 Magnet Base 3 Holder 4 Atomizer 5 Spray Nozzle 6 Cutting Fluid Container 7 Air Valve for Operation 8 Bytes

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

Claims (2)

[Claims] 1. A surface of an electrophotographic photosensitive member substrate made of an aluminum-based material is supplied with an aqueous cutting liquid while the surface of the substrate is cut by a cutting tool made of single-crystal diamond, and then water or a surfactant aqueous solution is used. A method for cleaning an electrophotographic photosensitive member substrate, which comprises cleaning the substrate with a cleaning liquid comprising: 2. An electrophotographic photoreceptor substrate made of an aluminum-based material is supplied with a water-based cutting fluid while the surface of the substrate is cut by a cutting tool made of single crystal diamond, and then the boiling point is 120 ° C. or less, A method for cleaning an electrophotographic photoreceptor substrate, which comprises cleaning the substrate with a water-soluble organic solvent having a dielectric constant of 18 or more.