JP2000061374A - Method and apparatus for immersing and coating cylinder outside surface - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent nonuniformity in a coating film by bubbles by preventing bubbles when a cylinder is immersed in coating, and the coating is applied on the outer surface of the cylinder. SOLUTION: A cylinder inner surface solvent sticking apparatus having a solvent outlet 17 which is arranged inside a cylinder W held by a cylinder holding apparatus 11 which holds the upper end part of the cylinder W in a state in which the lower end of the cylinder W the outer surface of which is to be coated with coating is opened and the upper end of the cylinder W is closed when the cylinder W is immersed in the coating and discharges the solvent to the inner surface of the cylinder W to be adhered to the surface and a solvent supply pipe 16 for supplying the solvent to the solvent outlet 17 is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dip coating method for forming a coating film on the outer surface of a cylindrical body, and is particularly suitable for coating precision parts such as photosensitive drums and developing sleeves used in electrophotographic equipment. The present invention relates to a dip coating method.

[0002]

2. Description of the Related Art Conventionally, various methods have been known as a method for coating the outer surface of a cylindrical body. Particularly, as in the case of precision parts such as photosensitive drums and developing sleeves used in electrophotographic equipment, When the smoothness and uniformity of the coating film are important,
The dip coating method is suitable. In the dip coating method, coating is performed by immersing the cylindrical body in the coating material and then pulling it up at an appropriate speed. However, if the cylindrical body having open upper and lower ends is dipped, the coating material enters the inside of the substrate, which is not preferable. In order to solve this point, a method is known in which the upper end of the cylindrical body is closed so that air is trapped inside to prevent the paint from entering the inside. However, when the cylindrical body with the upper end blocked is immersed in the paint and pulled up, if the solvent in the paint easily evaporates, the solvent evaporates into the air trapped inside the substrate and the pressure inside the substrate rises. At some point, bubbles are generated from the lower side of the substrate. Bubbles must be prevented because the bubbles that are generated burst on the surface of the paint and the liquid level fluctuates, causing serious defects.

Conventionally, the following techniques (J01) and (J02) are known as this type of cylindrical body outer surface dip coating method and apparatus. (J01) (Technology described in Japanese Patent Publication No. 62-54065) This publication discloses a method in which a paint is infiltrated into a part of the inside of the substrate and then the inside of the substrate is sealed. (J02) (Technology described in Japanese Utility Model Publication No. 4-4854) In this publication, in closing the upper end of the base in a hermetically sealed manner,
A method is disclosed in which a solvent is held in a space capable of being volatilized in a space inside a substrate to saturate the solvent vapor to suppress further evaporation of the solvent from the paint and prevent an increase in pressure inside the substrate.

[0004]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
1) and (J02) have the following problems. (Problem of (J01)) In this method, the holding device for the base requires an opening / closing device for the space inside the base and a mechanism for controlling the opening / closing timing. (Problem with (J02)) Since this method has a limit to the amount of solvent that can be retained, it is always necessary to replenish when continuously coating. In addition, since it takes some time for the solvent to reach saturation in the space inside the substrate after the substrate is closed, it is necessary to provide a waiting time for that.

In view of the above-mentioned circumstances (and examination results), the present invention has an object to be described in (O01) below. (O01) When the cylindrical body is dipped in the coating material and the coating material is applied to the outer surface of the cylindrical body, the generation of bubbles is prevented to prevent the generation of unevenness of the coating film due to the bubbles.

[0006]

The present invention devised to solve the above problems will now be described. The elements of the present invention are to facilitate correspondence with the elements of the embodiments described later. Note that the reference numerals of the elements of the embodiments are enclosed in parentheses. The reason why the present invention is described in association with the reference numerals of the embodiments described later is to facilitate the understanding of the present invention and not to limit the scope of the present invention to the embodiments.

(First Invention) In order to solve the above problems,
The cylindrical outer surface dip coating method according to the first aspect of the invention has the following requirements (A01) and (A02), (A0
1) The lower end of the cylindrical body (W) is opened and the upper end is hermetically closed and held by a cylindrical body holding device (11), and the cylindrical body (W)
Holding / adhering process to attach the solvent of paint to the inner surface of
(A02) A cylindrical body immersing step of immersing the cylindrical body (W) in the coating material from its lower end in a state where the solvent of the coating material is evaporated and the vapor is generated inside the cylindrical body (W).

(Operation of the First Invention) A first device having the above-mentioned structure.
In the cylindrical body outer surface dip coating method of the invention, in the holding / adhering step, the lower end of the cylindrical body (W) is opened and the upper end is sealed and held in the cylindrical body holding device (11), and the cylindrical body (W) is Apply paint solvent to the inside surface of the. Next, in the cylindrical body dipping step, the cylindrical body (W) is immersed in the coating material from its lower end in a state where the solvent of the coating material is evaporated and the vapor is generated inside the cylindrical body (W).

(Second invention) In order to solve the above problems,
The cylindrical outer surface dip coating apparatus of the second invention is characterized by having the following requirements (B01) and (B02).
1) A cylindrical body holding device (11), (B02) for holding the upper end of the cylindrical body (W) so that the lower end of the cylindrical body (W) is opened and the upper end is sealed. ) Is a solvent outlet (17) arranged inside the cylindrical body (W) held by the above-mentioned, and the solvent outlet (17) for causing the solvent of the paint to flow out and adhere to the inner surface of the cylindrical body (W). 17) and a solvent depositing device on the inner surface of a cylinder having a solvent supply pipe (16) for supplying the solvent to the solvent outlet (17).

(Operation of the Second Invention) A second device having the above construction.
In the cylindrical body outer surface dip coating device of the invention, the cylindrical body holding device (11) holds the upper end of the cylindrical body (W) so that the lower end of the cylindrical body (W) is opened and the upper end is sealed. The solvent supply pipe (16) of the solvent adhering device on the inner surface of the cylindrical body transfers the solvent of the paint to a solvent outlet (17) arranged inside the cylindrical body (W) held by the cylindrical body holding device (11). Supply. The solvent outlet (17) causes the solvent of the paint to flow out and adhere to the inner surface of the cylindrical body (W). The solvent attached to the inner surface of the cylindrical body (W) evaporates into a vapor while hanging down along the inner surface of the cylindrical body (W). The vapor of the solvent accumulates inside the cylindrical body (W) whose upper end is closed and whose lower end is open. In this state, when the cylindrical body (W) is immersed in the paint from its lower end, the solvent of the paint does not evaporate further inside the cylindrical body (W). Therefore, since the volume of the gas inside the cylindrical body (W) does not expand, the gas leaks from the lower end of the cylindrical body (W) or the leaked gas rises in the paint along the outer surface of the cylindrical body (W). There is nothing to do. Therefore, it is possible to prevent unevenness in the coating film on the outer surface of the cylindrical body (W).

(H), (I) In the first and second inventions, as the object to be coated of the cylindrical body (W), precision parts such as a photosensitive drum and a developing sleeve used particularly in electrophotographic equipment are used. It is possible. The amount of solvent adhered to the inner surface of the cylindrical body (W) depends on the inner diameter of the cylindrical body (W), but is preferably about several drops to 1 ml. If the adhered amount is small, the solvent vapor is not saturated inside the cylindrical body (W), so that the foaming prevention effect is insufficient. If the amount of adhesion is too large, the temperature of the cylindrical body (W) is greatly lowered due to the evaporation of the solvent, and the sudden change in the temperature when the cylindrical body (W) is immersed causes rather foaming, which is not preferable.

The solvent does not have to adhere to the entire inner surface of the cylindrical body (W), and the solvent may be attached at a part above the inner surface of the cylindrical body (W). When the solvent adheres, the evaporation of the solvent starts immediately, but the adhered solvent evaporates while flowing down the inner surface of the cylinder (W), so the evaporation area is large and the inside of the cylinder (W) is saturated with the solvent vapor. The time is very short. The timing of applying the solvent is preferably immediately before or after holding the cylindrical body (W). If the solvent adheres to the inner surface of the cylindrical body (W) immediately before holding the cylindrical body (W), the solvent vapor does not immediately dissipate even if the upper end of the cylindrical body (W) is open, so that Before this, the upper end of the cylindrical body (W) is held by the cylindrical body holding device (11) and sealed. It is not preferable that the solvent is dissipated if the time is more than 1 minute after the attachment. In the first invention,
As a method of adhering the solvent of the paint to the inner surface of the cylindrical body (W), it is possible to simply use a dropper, a washing bottle, a syringe (syringe), a nozzle or the like.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment of the Invention 1) First
Embodiment 1 of the cylindrical outer surface dip coating method of the invention is characterized in that the following requirements (A03) and (A04) are provided in the first invention, as a material for forming a (A03) photosensitive drum. The cylindrical body (W), which is the metal base material for a photosensitive drum, and (A04) the coating material for forming the photosensitive layer.

(Operation of First Embodiment of First Invention) In the first embodiment of the cylindrical outer surface dip coating method of the first invention having the above construction, the cylindrical body (W) forms a photosensitive drum. It is a substrate for a photosensitive drum made of metal as a material to be used. Therefore, since it is possible to form a uniform coating film for forming the photosensitive layer on the surface of the photosensitive drum substrate, it is possible to manufacture a photosensitive drum having a uniform photosensitive layer on the surface.

(Embodiment 2 of the first invention) A second embodiment of the method for dip coating the outer surface of the cylindrical body of the first invention is the same as the following requirement (A) in the method for dip coating the outer surface of the cylindrical body of the first invention.
(A05) The cylindrical body (W) which is a metal base material for a developing roll as a material for forming a cylindrical sleeve of the developing roll.

(Operation of Embodiment 2 of the First Invention) In the second embodiment of the cylindrical outer surface dip coating method of the first invention having the above-mentioned structure, the cylindrical body (W) has a cylindrical shape of the developing roll. It is a metal base for a developing roll as a material for forming a sleeve. Therefore, the coating film of the developing roll surface layer having no unevenness can be formed on the surface of the developing roll base material, so that the developing roll having a uniform surface layer can be manufactured.

(Embodiment 1 of the second invention) Embodiment 1 of the cylindrical outer surface dip coating apparatus of the second invention is characterized in that the following requirement (B03) is provided in the second invention. (B03) The solvent supply pipe (16) supported by the cylindrical body holding device (11).

(Operation of the first embodiment of the second invention) In the first embodiment of the cylindrical outer surface dip coating apparatus of the second invention having the above-mentioned structure, the solvent supply pipe (16) holds the cylindrical body. It is supported by the device (11). Therefore, it becomes possible to hold the upper end of the cylindrical body (W) in a closed state by the cylindrical body holding device (11) and at the same time to deposit the solvent of the paint inside the cylindrical body (W). The solvent attached to the inner surface of the cylindrical body (W) evaporates while the cylindrical body holding member conveys the cylindrical body (W) to a place where the cylindrical body (W) is immersed in the coating material, and vapor accumulates inside the cylindrical body (W). .

(Second Embodiment of the Second Invention) The second embodiment of the cylindrical outer surface dip coating apparatus according to the second invention has the following requirements (B04) and (B05) in the second invention. Characteristically, (B04) a cylindrical lower end support member that detachably supports the lower end of the cylindrical body (W), and (B05) the solvent supply pipe (16) supported by the cylindrical lower end support member.

(Operation of Embodiment 2 of the Second Invention) In the second embodiment of the cylindrical outer surface dip coating apparatus of the second invention having the above-mentioned structure, the lower end support member for the cylindrical body is the cylindrical body (W). Detachably support the lower end of the solvent supply pipe (1
Support 6). The solvent supply pipe (16) has a cylindrical body (W) that is detachably supported by the cylindrical body lower end support member, has its upper end held by a cylindrical body holding member, and at the same time, paint on the inner surface of the cylindrical body (W). A solvent can be attached.
The solvent attached to the inner surface of the cylindrical body (W) evaporates while the cylindrical body holding member conveys the cylindrical body (W) to a place where the cylindrical body (W) is immersed in the coating material, and vapor accumulates inside the cylindrical body (W). .

(Embodiment 3 of the second invention) Embodiment 3 of the cylindrical outer surface dip coating apparatus of the second invention is Embodiment 1 of the cylindrical outer surface dip coating apparatus of the second invention or the second invention. Alternatively, the cylindrical outer surface dip coating apparatus of 2 is provided with the following requirement (B06), (B0
6) The cylindrical body (W) which is a metal base material for the photosensitive drum as a material for forming the photosensitive drum.

(Operation of Third Embodiment of the Second Invention) In the third embodiment of the cylindrical outer surface dip coating apparatus of the second invention having the above-mentioned structure, the cylindrical body (W) forms a photosensitive drum. It is a substrate for a photosensitive drum made of metal as a material to be used. Therefore, since it is possible to form a uniform coating film for forming the photosensitive layer on the surface of the photosensitive drum substrate, it is possible to manufacture a photosensitive drum having a uniform photosensitive layer on the surface.

(Fourth Embodiment of the Second Invention) The fourth embodiment of the cylindrical outer surface dip coating apparatus of the second invention is the first embodiment of the cylindrical outer surface dip coating apparatus of the second invention or the second invention. (B07) A metal developing roll base as a material for forming a cylindrical sleeve of the developing roll, characterized in that the cylindrical outer surface dip coating device according to any one of (1) to (3) is provided with the following requirement (B07): The cylindrical body (W) which is a material.

(Operation of Embodiment 4 of the Second Invention) In Embodiment 4 of the cylindrical outer surface dip coating apparatus of the second invention having the above-mentioned structure, the cylindrical body (W) has a cylindrical shape of the developing roll. It is a metal base for a developing roll as a material for forming a sleeve. Therefore, the coating film of the developing roll surface layer having no unevenness can be formed on the surface of the developing roll base material, so that the developing roll having a uniform surface layer can be manufactured.

(Embodiment) A specific example (embodiment) of the embodiment of the cylindrical outer surface dip coating method and apparatus of the present invention will be described below with reference to the drawings. It is not limited. (Embodiment 1) FIG. 1 is an overall explanatory view of Embodiment 1 of a cylindrical body outer surface dip coating apparatus of the second invention. FIG. 2 is an explanatory view of the cylindrical lower end support member of the first embodiment shown in FIG.
2A is a front view, and FIG. 2B is a view seen from the line IIB-IIB in FIG. 2A. FIG. 3 is an explanatory view of the operation of the first embodiment, and FIG.
FIG.

In FIG. 1, a coating tank 2 is supported on a substrate 1, and the coating tank 2 contains a paint mixed with a solvent. The paint in the coating tank 2 is always kept in an appropriate amount by a paint supply device (not shown), but the overflowed paint is collected in the receiver 2a. The coating tank 2 is provided on the substrate 1.
A rotary table 3 which is rotated by a motor unit M1 is supported adjacent to. A screw shaft 4 is rotatably supported on the rotary table 3, and the lower portion of the screw shaft 4 is rotated by a cylindrical body lifting motor M2. A guide column 6 parallel to the screw shaft 4 is fixed to the rotary table 3. The upper ends of the screw shaft 4 and the guide column 6 are connected by a connecting member 7. A nut 8 is screwed onto the screw shaft 4. A lifting lever 9 is connected to the nut 8. As shown in FIGS. 1 and 3, one end portion (proximal end portion) of the elevating lever 9 is provided with a fitting groove 9a for fitting around the guide strut 6 to prevent rotation. Therefore, since the nut 8 and the elevating lever 9 cannot rotate, the screw shaft 4
Moves up and down when rotates.

A plurality of lever sensors (not shown) for detecting the vertical position of the elevating lever 9 are provided on the guide column 6.
Are provided, and the vertical movement of the elevating lever 9 is controlled by the detection signals of these lever sensors. A cylindrical body holding device 1 extending downward at the tip of the elevating lever 9.
1 is supported. The cylindrical body holding device 11 holds the cylindrical body W, which is the object to be coated, at its lower end in a state of extending downward. The cylindrical body holding device 11 has a small-diameter cylindrical portion 12 inserted at the lower end inside the upper end of the cylindrical body W, a rubber ring-shaped holding portion 13 provided on the upper side thereof, and a large-diameter cylinder provided on the upper side thereof. And a section 14.

The ring-shaped holding portion 13 is an elastic bag-shaped member, and the small diameter cylindrical portion 12 is a pressing member for compressing and deforming the ring-shaped holding portion 13 which is an elastic bag-shaped member. By deforming the ring-shaped holding portion 13 by the small-diameter cylindrical portion 12, the upper end of the cylindrical body W can be closed and held or can be detached. Such a technique is described in, for example, Japanese Utility Model Laid-Open No. 4-70163. Therefore, in the cylindrical body holding device 11, the small-diameter cylindrical portion 12 and the ring-shaped holding portion 13 are arranged inside the cylindrical body W and the large-diameter cylindrical portion 14 is in contact with the upper end of the cylindrical body W. When expanded and deformed to the outside,
The cylindrical body W can be held, and when the ring-shaped holding portion 13 contracts and deforms inward in that state, the cylindrical body W can be brought into a non-holding state.

As shown in FIG. 2A, the cylindrical body holding device 11 supports a solvent supply pipe 16. Solvent supply pipe 16
From the upper side of the large diameter cylindrical portion 14 to the small diameter cylindrical portion 12
Of the solvent, and a solvent outlet 17 is provided at the lower end thereof. When the cylindrical body holding device 11 holds the cylindrical body W, the solvent outlet 17 is provided with the cylindrical body W.
Is arranged so as to face the inner surface of the. The upper end of the solvent supply pipe 16 is connected to a solvent tank 19 via a tube 18.
It is connected to the. An opening / closing valve V is provided in the middle of the tube 18, and the solvent is allowed to flow out from the solvent outlet 17 when the opening / closing valve V is opened.

A cylindrical body exchange table 21 is arranged adjacent to the substrate 1. The cylindrical body exchange table 21 is rotated by the motor unit M3, and the cylindrical body supporting members 22 and 22 are provided on the upper surface of the cylindrical body exchange table 21 at equidistant positions (positions apart by 180 ° around the rotating shaft) with the rotating shaft interposed therebetween. There is. Therefore, as can be seen from FIGS. 1 and 3, the cylindrical body W supported by one of the two cylindrical body supporting members 22, 22 is held by the cylindrical body holding device 11. Then, after immersing in the coating tank 2 to apply the paint to the surface of the cylindrical body, it is returned to the cylindrical body supporting member 22, and then the cylindrical body exchange table 21 is rotated to be supported by the other cylindrical body supporting member 22. The coating material can be continuously applied to the surface of the cylindrical body. While the coating material is being applied to the surface of the cylindrical body supported by the other cylindrical body supporting member 22, the cylindrical body W on the one cylindrical body supporting member 22 for which the coating material has been applied is next removed. By replacing the cylindrical body W on which the coating material is applied, the coating material on the surface of the cylindrical body can be continuously applied.

Next, a specific example of applying the coating material to the surface of the cylindrical body using the dip coating device for the outer surface of the cylindrical body of Example 1 will be described as a test example. In the following description, "part" is part by weight. (Test Example 1 of Example 1) The cylindrical body W has an outer diameter of 30 m.
An aluminum pipe having a diameter of m, an inner diameter of 28.4 mm, and a length of 340 mm was prepared. For the paint, 12 parts of zirconium butoxide compound (trade name: ZC540, Matsumoto Kosho) and 1 part of silane coupling agent (trade name: A1110, Nippon Unicar) are mixed solution of methanol and n-butanol (mixed). Ratio 3: 2) using a solution dissolved in 48 parts,
It was placed in the coating tank 2 of the dip coating device shown in FIG. Then, a predetermined amount of methanol (about 10 drops with a dropper) was attached to the upper end of the inner surface of the cylinder from the solvent outlet 17. Methanol easily evaporates, so evaporation started immediately,
Approximately 4 seconds after the attachment, the cylindrical body W was held by the cylindrical body holding device 11 and immersed in the coating tank 2 at a speed of 1.5 m / min. Next, the cylindrical body W was pulled up at a speed of 160 mm / min and applied, but there was no foaming during that period. Cylindrical body W
Was heated at 135 ° C. for 10 minutes to form a 0.1 μm thick undercoat layer on the outer surface.

(Comparative Example 1) In Test Example 1 of Example 1 described above, when the cylindrical body W was held, but the methanol did not adhere to the inner surface of the cylindrical body, the cylindrical body W was coated with the coating tank 2
After immersing at a predetermined depth (starting position for pulling) and then starting pulling up, foaming was observed in about 1 minute and unevenness occurred in the coating film.

(Test Example 2 of Example 1) As a paint, N,
N'-diphenyl-N, N '-(m-tolyl) benzidine 3
1-3 parts and polycarbonate resin (trade name: Iupilon Z400, Mitsubishi Gas Chemical Co., Ltd.) 64 parts are dissolved in a mixed solution of 100 parts of tetrahydrofuran (THF) and 150 parts of monochlorobenzene, and a coating solution is used, as shown in FIGS. It was placed in the coating tank 2 of the outer surface dip coating apparatus of Example 1. On the other hand, a cylindrical body W in which a charge generating layer containing a phthalocyanine pigment is applied on the undercoat layer is prepared, and a predetermined amount of THF (the same amount as in Test Example 1) is supplied from the solvent outlet 17 to the upper end portion of the inner surface of the cylindrical body. , With a dropper). Approximately 4 seconds after the attachment, the cylindrical body W was held by the cylindrical body holding device 11 and dipped in the coating material in the coating tank 2 at a speed of 1.5 m / min. Next, the cylindrical body W was pulled up at a speed of 110 mm / min and applied, but there was no foaming during that period. The cylindrical body W is heated at 135 ° C. for 40 minutes to form 25 μm on the charge generation layer.
An m-thick charge transport layer was formed. In this way, a photosensitive drum having no coating unevenness could be manufactured.

(Comparative Example 2) In Test Example 2 of Example 1 above, when THF was not dropped when holding the cylindrical body W, foaming was observed about 1 minute after starting to pull up the cylindrical body W. The coating film became uneven. On the photosensitive drum having unevenness in the coating film of the undercoat layer or the charge transport layer, when an image was produced, uneven density corresponding to the unevenness was observed and the image quality was poor.

(Test Example 3 of Example 1) 50 parts of graphite (trade name: CSP, Nihon Graphite), 20 parts of carbon black (trade name: Conductex 975, Colombian carbon) and phenol resin (trade name: Praiophen) , Dainippon Ink Co., Ltd.) and 100 parts of acetone as a solvent, and the mixture was dispersed in a sand mill.
Acetone was further added to obtain a paint having a viscosity of 90 mPa sec, and the paint was placed in the coating tank 2 of the cylindrical outer surface dip coating device shown in FIG. As a cylindrical body W, outer diameter 18 mm, inner diameter 1
An aluminum pipe having a length of 6.4 mm and a length of 320 mm was prepared. A predetermined amount of acetone (the same amount as in Test Example 1 of Example 1, about 10 drops with a dropper) was attached to the upper end of the inner surface of the cylindrical body from the solvent outlet 17. Approximately 4 seconds after the attachment, the cylindrical body W was chucked to the cylindrical body holding device 11 and immersed in the coating tank 2 at a speed of 1.5 m / min. Then 300
The cylindrical body W was pulled up at a speed of m / min to perform coating,
There was no foaming during that time. Next, the cylindrical body W was heated at 150 ° C. for 30 minutes to cure the coating film, thereby obtaining a developing sleeve having a coat layer with a thickness of 20 μm formed on the outer surface.

This developing sleeve was made to have a volume average particle diameter of 7 μm.
The test was carried out in a low-temperature low-humidity environment of 10 ° C. and 15% RH by incorporating it into a developing device of a digital copying machine (product name: Able1320, Fuji Xerox) having m magnetic one-component toner. The obtained image had good density and fine line reproducibility, and no development ghost occurred.

(Comparative Example 3) In Test Example 3 of Example 1 above, when acetone was not dropped while holding the cylindrical body W, foaming was observed in about 1 minute after starting the pulling up of the cylindrical body W. The coating film became uneven. In the developing sleeve in which unevenness was generated, when an image was taken out, uneven density corresponding to the unevenness was observed, and the image quality was poor.

Comparative Example 4 When the aluminum pipe of Test Example 3 of Example 1 was applied as a developing sleeve without forming a coat layer, the obtained image had good density and fine line reproducibility. However, there is a development ghost where the image developed by the developing sleeve last time appears lightly at the next rotation.
The image quality was inferior. By forming the coating layer of Test Example 3 of Example 1 above, the triboelectric chargeability of the magnetic one-component toner is appropriately adjusted, and the occurrence of development ghost is prevented.

(Embodiment 2) FIG. 4 is an explanatory view of Embodiment 2 of the cylindrical outer surface dip coating apparatus of the second invention, and is a drawing corresponding to FIG. 2 of Embodiment 1. In the description of the second embodiment, constituent elements corresponding to those of the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. The second embodiment differs from the first embodiment in the following points, but is configured similarly to the first embodiment in other points.
In the second embodiment, the cylindrical body holding device 11 of the first embodiment is used.
The solvent supply pipe 16 supported by the second embodiment is different from the first embodiment in that it is supported by other members.

In FIG. 4, the two cylindrical body support members 22 of the cylindrical body exchange table 21 support the solvent supply pipe 16, respectively. The solvent outlets 17 and 17 at the ends of the solvent supply pipes 16 and 16 are arranged so as to face the upper end of the inner surface of the cylindrical body supported by the cylindrical body supporting members 22 and 22, respectively. Each of the solvent supply pipes 16 and 16 is connected to a tube 18 via valves V and V, and the tube 18 is connected to the solvent tank 1
9 is connected. The solvent tank 19 is arranged above the solvent outlet 17, and the valve V
The solvent can be attached to the inner surface of the cylindrical body W from the solvent outlet 17 by opening.

In the second embodiment, like the first embodiment,
The solvent can be attached to the inner surface of the cylindrical body from the solvent outlet 17 at the same time as or immediately before or after the cylindrical body holding device 11 holds the cylindrical body W on the cylindrical body supporting member 22. Therefore, the second embodiment can achieve the same operation as the first embodiment.

(Modifications) Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-mentioned embodiments, but is within the scope of the gist of the present invention described in the claims. Thus, various changes can be made. A modified embodiment of the present invention is illustrated below. (H01) The present invention can be applied to a dip coating method and apparatus for the outer surface of a cylindrical body using various conventionally known coating tanks.

[0043]

INDUSTRIAL APPLICABILITY The above-mentioned cylindrical body outer surface dip coating method and apparatus of the present invention can achieve the following effects. (E01) In the present invention, foaming at the time of application is prevented and a coating film having no defects can be formed. Therefore, when the present invention is used for coating a precision component such as a photoconductor drum or a developing sleeve that is extremely unsuitable for uneven coating, a photoconductor drum or a developing sleeve having a uniform coating film can be manufactured.

[Brief description of drawings]

FIG. 1 is an overall explanatory view of Embodiment 1 of a cylindrical body outer surface dip coating apparatus of the present invention.

2 is an explanatory view of a lower end support member for a cylindrical body of Example 1 shown in FIG. 1, FIG. 2A is a front view, and FIG. 2B is a view seen from a line IIB-IIB in FIG. 2A. is there.

FIG. 3 is an explanatory view of the operation of the first embodiment and is a perspective view of FIG. 1.

FIG. 4 is an explanatory view of a second embodiment of the cylindrical body outer surface dip coating apparatus of the present invention, and is a view corresponding to FIG. 2 of the first embodiment.

[Explanation of symbols]

W ... Cylindrical body, 11 ... Cylindrical body holding device, 16 ... Solvent supply pipe, 17 ... Solvent outlet.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Fumio Taishi             Fuji Zero, 1600 Takematsu, Minamiashigara City, Kanagawa Prefecture             X Co., Ltd. (72) Inventor Shigeo Ota             Fuji Zero, 1600 Takematsu, Minamiashigara City, Kanagawa Prefecture             X Co., Ltd. F-term (reference) 2H068 AA21 AA54 EA16 EA18                 4D075 AB37 AB41 AB43 AB55 CA48                       DA15 DC19 EA45 EC30                 4F040 AA07 CC08 CC13 CC15

Claims (4)

[Claims] 1. A method for dipping and coating an outer surface of a cylindrical body, comprising the following requirements (A01) and (A02): (A01)
A holding / adhering step in which the lower end of the cylinder is opened and the upper end is closed and held in the cylinder holding device, and the solvent of the paint is adhered to the inner surface of the cylinder, (A02) The solvent of the paint is evaporated. And a step of immersing the cylindrical body in the coating material from its lower end in a state where the vapor is generated inside the cylindrical body. 2. A cylindrical body outer surface dip coating apparatus, characterized by having the following requirements (B01) and (B02): (B01)
A cylindrical body holding device for holding the upper end portion of the cylindrical body so as to open the lower end of the cylindrical body and seal the upper end portion, (B02) A solvent arranged inside the cylindrical body held by the cylindrical body holding device A solvent injecting device on the inner surface of a cylinder, which is an ejection port and has the solvent ejection port for ejecting and adhering the solvent of the paint to the inner surface of the cylindrical body and a solvent supply pipe for supplying the solvent to the solvent ejection port. 3. The cylindrical outer surface dip coating device according to claim 2, wherein the following requirements (B03) are satisfied:
03) The solvent supply pipe supported by the cylindrical body holding device. 4. The cylindrical outer surface dip coating device according to claim 2, wherein the following requirements (B04) and (B05) are provided, and (B04) a cylinder for detachably supporting the lower end of the cylindrical body. Lower body support member, (B05) The solvent supply pipe supported by the cylindrical lower body support member.