JPH09244285A - Production of substrate for seamless belt electrophotographic photoreceptor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the industrially inexpensive production of a substrate for a seamless belt electrophotographic photoreceptor having excellent shape accuracy by forming a mold body of a metallic cylinder and forming this mold surface as a tetrafluororesin worked layer. SOLUTION: The mold body 2 which is the metallic cylinder 4 is coated with the seamless tubular synthetic resin film 1 having thermal shrinkability. The tetrafluororesin worked layer 5 is formed on this metallic cylinder 4. In such a case, a metallic cylinder is used as the mold body. More specifically, aluminum, stainless steel, etc., are used. The dimensional accuracy and surface accuracy sufficiently satisfying the required accuracy are required to be previously secured for the metallic cylinder 4 before the surface thereof is provided with tetrafluororesin worked layer. The surface of the metallic cylinder 4 is subjected to a combining treatment with a different material as the method for forming the tetrafluororesin worked layer on this surface, by which the surface having excellent wear resistance and small coefft. of friction is obtd.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrophotographic copying machine,
The present invention relates to a method for manufacturing a seamless belt electrophotographic photosensitive member substrate used in printers, facsimiles, and the like.

[0002]

2. Description of the Related Art Conventionally, as a method for producing a seamless belt electrophotographic photoreceptor substrate using a heat-shrinkable seamless tube-shaped synthetic resin film, a mold is covered with the seamless tube-shaped synthetic resin film and heat-shrinked. Thus, there have been proposed some methods of forming a seamless belt electrophotographic photoreceptor substrate on the mold body and then removing the seamless belt electrophotographic photoreceptor substrate from the mold body.

For example, in JP-A-64-570 and JP-A-64-8025, a method of forming a releasing interface of grease oil or the like on the surface of a mold for a seamless belt electrophotographic photoreceptor substrate. Are disclosed in Japanese Patent Application Laid-Open No. Sho 63
No. 61254 discloses a method of injecting and withdrawing a gas or a liquid between a seamless tubular synthetic resin film and a mold, and a method of using an elastic body or a disassembly type mold which is a mold. Further, in JP-A-5-45897, a seamless tube is used by using a porous mold body, and by applying atmospheric pressure or hydraulic pressure to the porous mold body, a gas or liquid passing through the pores from the inside of the mold body. A method for pulling out a synthetic resin film is described.

[0004]

However, Japanese Patent Laid-Open No. 64-570 and Japanese Patent Laid-Open No. 64-802 described above.
According to the method described in Japanese Patent Publication No. 5, it is difficult to obtain stable lubricity, and it is necessary to form a mold release interface such as grease oil on the surface of the mold every time the heat shrinks, and the conductive layer or the photosensitive layer is formed. In the process, the lubricant is mixed in the film,
There is a problem that the final quality of the electrophotographic photosensitive member is adversely affected. Further, in the methods described in JP-A-63-61254 and JP-A-5-45897, since it is necessary to apply atmospheric pressure or hydraulic pressure, an extra step is required and the production cost is high. There's a problem. Further, the method described in Japanese Patent Laid-Open No. 63-61254, which uses an elastic body or a disassembled assembly type mold as the mold, is inferior in the shape accuracy required for the electrophotographic photosensitive member, and is satisfied seamlessly. A belt electrophotographic photoreceptor substrate cannot be obtained.

Therefore, an object of the present invention is to solve the above-mentioned problems of the prior art and to provide a method for industrially inexpensively manufacturing a substrate for a seamless belt electrophotographic photosensitive member which is excellent in shape accuracy. .

[0006]

In the method for producing a substrate for a seamless belt electrophotographic photoreceptor of the present invention, a heat-shrinkable seamless tubular synthetic resin film is coated on the surface of a mold and then heat-shrinked. According to the method for producing a seamless belt electrophotographic photoreceptor substrate formed on a mold body, the mold body is a metal cylinder, and the mold body surface is a tetrafluororesin processed layer. And

The surface of the mold used in the present invention is a tetrafluororesin processed layer, which is preferably a composite film of a matrix containing a metal and a tetrafluororesin. Further, the composite coating, that is formed by performing a composite plating treatment in which tetrafluororesin fine particles are uniformly dispersed and co-deposited in an electroless nickel plating coating, or
It is preferable that a metallic porous layer is provided and the pores of the porous layer are sealed with a tetrafluororesin. Further, as the metallic porous layer, a porous hard anodic oxide coating obtained by using a cylindrical body made of aluminum or an aluminum alloy in a metal cylindrical body and subjecting the surface of the cylindrical body to anodization treatment Or, it is preferably a chromium plating film in which microcracks are generated.

[0008]

Embodiments of the present invention will be described below in detail. FIG. 1 is a schematic configuration diagram showing a state in which a mold 2 is covered with a heat-shrinkable seamless tubular synthetic resin film 1. FIG. 2 is a schematic configuration diagram showing a state in which the seamless belt electrophotographic photosensitive member substrate 3 is formed on the mold body 2 by heat-shrinking the heat-shrinkable seamless tubular synthetic resin film. FIG.
FIG. 3 is a schematic configuration diagram showing a state in which a seamless belt electrophotographic photosensitive member substrate 3 is extracted from a mold 2.

In the present invention, biaxially stretched polyethylene terephthalate, biaxially stretched polybutylene terephthalate, etc. are used as the heat-shrinkable seamless tubular synthetic resinous film 1 used in the production of the substrate for the seamless belt electrophotographic photoreceptor. The film thickness of the film is preferably about 20 to 100 μm.

The mold 2 used for manufacturing the seamless belt electrophotographic photosensitive member substrate has the outer surface shape transferred to the inner surface of the seamless belt electrophotographic photosensitive member substrate 3 to form the shape of the seamless belt electrophotographic photosensitive member substrate. Since the accuracy and the surface roughness are determined, the mold body 2 is required to have a shape accuracy equal to or higher than the shape accuracy required for the seamless belt electrophotographic photosensitive member substrate 3.

In order to easily mount the heat-shrinkable seamless tubular synthetic resin film 1 on the mold body 2 and to easily remove the seamless belt electrophotographic photoreceptor substrate from the mold body, The surface preferably has lubricity. If the lubricity of the surface of the mold body is increased, fluid pressure is applied between the mold body and the seamless belt photoreceptor base, without providing extra steps such as deforming the mold body itself. The base material for a seamless belt electrophotographic photosensitive member can be easily removed from the mold. The seamless belt electrophotographic photoconductor substrate 3 is normally removed from the mold body 2 in order to prevent the photoconductor substrate from shrinking again due to heating in the subsequent photoconductor laminating step. It is preferably performed after laminating the conductive layer and the photosensitive layer on the body substrate.

FIG. 4 is a schematic sectional view showing a structural example of a mold used in the present invention, in which a tetrafluororesin processing layer 5 is formed on a metal cylinder 4. As the mold body in the present invention, a metal cylinder is used, and specifically, aluminum, stainless steel, or the like is used. This metal cylinder is
Before providing the tetrafluororesin processed layer thereon, it is necessary to secure dimensional accuracy and surface roughness that sufficiently satisfy the required accuracy in advance.

In the present invention, as a method of forming the tetrafluororesin processed layer on the surface of the metal cylinder, a composite treatment with different materials is used to form a surface having excellent wear resistance and a very small friction coefficient. Obtainable. A method of applying a lubricant or the like is not preferable because the durability of the lubricated surface is poor, and a processing method having low hardness is also not preferable. In order to form the above-mentioned tetrafluororesin processed layer, as one of the composite treatments with different materials, the tetrafluororesin fine particles are uniformly dispersed and co-deposited in the electroless nickel plating film, which is a composite plating treatment. The method can be applied. The tetrafluoride resin fine particles used in this method have a particle diameter of about 0.1 to 10 μm, preferably 0.1 to 1 μm. Further, the shape of the particles is preferably such that it has no sharp corners and is closer to a spherical shape. Further, the content of the tetrafluororesin can be up to 30% by weight, but it is 1.5 to 8.5.
It is preferable to select from the range of weight%.

Further, in order to form the tetrafluororesin processed layer, a composite treatment with a heterogeneous porous material may be performed.
Similar effects can be obtained. For example, the following two processing methods can be used. First, as a first method, a cylindrical body made of aluminum or an aluminum alloy is prepared as a metallic cylindrical body. Next, on the surface of the cylinder,
Form a porous hard anodic oxide film. Furthermore, the porous structure of the hard anodic oxide film is impregnated with or coated with a tetrafluoride resin, and then fused and finished. Usually, the processed surface has a thickness of 25 to 50 μm. In the case of an aluminum alloy, an alloy containing 4% or more Cu and / or 7% or more Si is unsuitable. A large amount of Cu causes the film to dissolve into the electrolytic solution. On the other hand, a large amount of Si does not form a film on the Si portion, and the Si-precipitated portion becomes cracked.

Next, as a second method, the surface of the metal cylinder is subjected to a chrome plating film treatment, and tetrafluororesin fine particles are mechanically embedded in the microcrack structure generated in the chrome plating film. It is a processing method. Examples of the metal cylinder used include Fe, Cu, Al, alloys thereof, and castings. However, Ti, W, cemented carbide (equivalent to JIS H5501) and easy fusion metal (Pb
-Sn, Pb-Bi, Pb-Sn-Bi, etc. are not preferable. In the case of cemented carbide, a strong oxide film is formed on the extreme surface layer, it is difficult to obtain a clean surface, and chrome plating is not deposited and adhesion is likely to occur. On the other hand, in the case of easy fusion money,
It cannot withstand the high temperature heat load of 190 to 210 ° C. required in the step of expanding the microcracks generated in the chromium plating film.

A chrome-plated film having a film thickness of 50 to 70 μm is applied to the prepared metal cylinder while stabilizing the electrodeposition stress, and microcracks are generated in the chrome-plated film by a chemical treatment. Next, the microcracks are heated and expanded from 190 to 210 ° C., and mechanically impregnated with 0.5 to 3 μm tetrafluororesin fine particles which are shrunk by being cooled to −60 to 80 ° C. therein. Encapsulate and fix tetrafluoride resin particles. Since the coefficient of thermal expansion of Teflon is very large, the tetrafluoride resin fine particles are warmed in the cracks and expand rapidly, while the cracks cool and shrink. Interference is permanently fitted.

[0017]

EXAMPLES The present invention will be specifically described below with reference to examples, but the scope of the present invention is not limited to these. In Examples 1 to 3, the heat-shrinkable seamless tubular synthetic resin film has a circumference of 280 m.
A biaxially stretched heat-shrinkable polyethylene terephthalate tube having a thickness of m and a thickness of 60 μm was used. As a metal cylinder for a mold body, A105 having an outer diameter of 84 mmφ and a length of 340 mm
A pure aluminum mirror-cutting pipe was used.

Example 1 The prepared metal cylinder for a mold was degreased and washed, and then, in a nickel sulfate plating bath using sodium hypophosphite as a reducing agent at a temperature of 85 ° C. and a pH of 5 for the mold. Electroless Ni-P / PTFE (polytetrafluoroethylene) composite plating was performed on the surface of the metal cylinder. Use PTFE particles with a particle size of 1 μm or less and a film thickness of 20 μm.
A composite plating film having m and a PTFE content of 8.5% by weight was obtained. A heat-shrinkable polyethylene terephthalate tube was covered on the mold body subjected to the composite plating treatment and heated in a hot-air dryer at 150 ° C. for 30 minutes to shrink the heat-shrinkable polyethylene terephthalate tube and bring it into close contact with the mold body.
In this state, cylindricity (using Mitutoyo round test)
Was measured. Further, both ends of the tube were cut into 15 mm each by a commercially available cutter and aligned to a required length, and then the tube could be easily pulled out from the mold body by pulling the tube by hand. Furthermore, the surface roughness (using Surfcom manufactured by Tokyo Seimitsu Co., Ltd.) of the extracted tube surface was measured.

Example 2 The prepared metal cylinder for mold was degreased and washed, and then a hard anodic oxide film of 50 μm was formed on the surface in a sulfuric acid bath.
Next, a composite coating was obtained by covering the oxide coating with a PTFE resin having a thickness of 1 to several μm to impregnate the pores and fusing at a temperature of 120 ° C. or lower. The mold body that had been subjected to the composite film treatment was covered with a heat-shrinkable polyethylene terephthalate tube, and thereafter, the same work and measurement as in Example 1 were performed. Also in this case, just pull the tube by hand,
The heat-shrinkable tube could be easily removed from the mold.

Example 3 The prepared metal cylinder for a mold was degreased and washed, and then the surface was plated with chromium to a film thickness of 50 μm. In this state, cracks have already occurred in the chrome plating layer, but the depth of cracks is reduced to 10 by further chemical etching.
The activated adsorption layer was ˜20 μm. The activated chrome plating layer is heated to 200 ° C to expand cracks,
PTF of 2μm or less cooled to minus 70 ℃ in it
The E particles were encapsulated and fixed by interference fitting to obtain a composite film. The mold body that had been subjected to the composite film treatment was covered with a heat-shrinkable polyethylene terephthalate tube, and thereafter, the same work and measurement as in Example 1 were performed. In this case as well, the heat-shrinkable tube could be easily removed from the mold simply by pulling the tube by hand. Examples 1 to 3 above
Table 1 shows the measurement results obtained in.

[0021]

[Table 1] As is clear from Table 1, in all of Examples 1 to 3, it was possible to obtain a seamless belt electrophotographic photosensitive member substrate having excellent shape accuracy. Further, even if the work shown in each of the examples is repeated 50 times using the molds of Examples 1 to 3, the shape accuracy of the heat-shrinkable polyethylene terephthalate tube after heat shrinkage and the removability from the mold are improved. There was no change, and there was no visual damage such as scratches on the mold surface.

Comparative Example After degreasing and cleaning the prepared metal cylinder for a mold, a dry coating lubricant containing a fluororesin other than PTFE as a main component was spray-coated on the surface of the metal cylinder, and then heat shrinkability was obtained. After covering with a polyethylene terephthalate tube, the same work and measurement as in Example 1 were performed. The cylindricity and the surface roughness were similar to the results of Examples 1 to 3, but it was difficult to pull out the heat-shrinked tube only by pulling the tube by hand, and between the tube and the mold body. It was finally possible to pull out by blowing compressed air. After repeating the same operation 50 times,
There were many visually recognizable scratches on the surface of the metal cylinder, and the lubricant film was damaged.

[0023]

EFFECTS OF THE INVENTION The seamless belt electrophotographic photoreceptor substrate mold used in the present invention has the advantage that the seamless tubular synthetic resin film can be easily covered and pulled out. The seamless belt electrophotographic photoreceptor substrate produced by the above method has excellent shape accuracy and can be manufactured industrially at low cost.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a state where a heat-shrinkable seamless tubular synthetic resin film is covered on a mold.

FIG. 2 is a schematic configuration diagram showing a state in which a seamless belt electrophotographic photosensitive member substrate is formed on a mold.

FIG. 3 is a schematic configuration diagram showing a state where a seamless belt electrophotographic photosensitive member substrate is extracted from a mold body.

FIG. 4 is a schematic cross-sectional view showing a configuration example of a mold used in the manufacturing method of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Heat-shrinkable seamless tubular synthetic resin film, 2 ... Mold body, 3 ... Seamless belt base body for electrophotographic photoreceptors, 4 ... Metal cylinder body, 5 ... Tetrafluoride resin processed layer.

Claims (6)

[Claims] 1. A method for producing a substrate for a seamless belt electrophotographic photosensitive member, which is formed on a mold body by coating the surface of the mold body with a heat-shrinkable seamless tubular synthetic resin film and then heat-shrinking the mold body surface. 2. The method for producing a base body for a seamless belt electrophotographic photoreceptor, wherein the mold body is a metal cylinder, and the surface of the mold body is a tetrafluororesin processed layer. 2. The method according to claim 1, wherein the tetrafluororesin processed layer is a composite film of a matrix containing a metal and a tetrafluororesin. 3. The composite coating according to claim 2 is formed by subjecting an electroless nickel plating coating to a composite plating treatment in which tetrafluororesin fine particles are uniformly dispersed and co-deposited. The method of claim 1 characterized. 4. The composite film according to claim 2, wherein a metallic porous layer is provided, and pores of the porous layer are sealed with a tetrafluoride resin. The method of claim 1. 5. A porous hard anodic oxide obtained by using a cylindrical body made of aluminum or an aluminum alloy as a metallic cylindrical body for the porous layer according to claim 4, and subjecting the surface of the cylindrical body to anodizing treatment. The method according to claim 1, wherein the method is a coating. 6. The method according to claim 1, wherein the porous layer according to claim 4 is a chromium plating film in which microcracks are generated.