JP4429972B2 - Coating apparatus and method for manufacturing photoreceptor - Google Patents

Description

  The present invention relates to a coating apparatus, a method for manufacturing a photoreceptor, a photoreceptor, and an image forming apparatus.

  As a method for producing an electrophotographic photosensitive member, a dip coating method is known. The dip coating method is a method in which an object to be coated is immersed in a coating solution and then lifted, and the coating solution is connected by a pipe between the coating tank and the coating solution tank. It is common to circulate using.

  In the dip coating method, bubbles may occur depending on the type of coating liquid, the circulation type, etc.For example, the coating liquid containing resin has viscosity, how to flow the coating liquid, share of the pump, It is known that bubbles are generated by entraining air in the coating liquid tank due to the circulation flow rate, temperature, and the like, resulting in coating film defects.

  Therefore, in Patent Document 1, a cylindrical substrate having both ends opened as an object to be coated, and only the lower end portion of the substrate is infiltrated into the coating liquid in a state where the upper end portion of the substrate is closed. A coating method is disclosed in which the state is maintained until the generation of bubbles from the lower end of the substrate accompanying the increase in vapor pressure is substantially not observed. However, there is a problem that it is difficult to remove fine bubbles generated with the generation of bubbles, and a coating film defect occurs. Moreover, it takes time until bubbles are generated due to an increase in vapor pressure.

  Patent Document 2 discloses a dip coating apparatus in which a filter is provided in a pipe connecting between a coating tank and a coating liquid tank, and the filter and the coating liquid tank are communicated with each other through the pipe. When the application object is dipped in the coating solution with the opening of the application object facing down and air is confined inside the application object, A dip coating method is disclosed in which the inside of an object to be coated is opened immediately before the distance between the two. Patent Document 4 discloses a dip coating apparatus having at least one notch or cough at the upper end of a coating tank, and Patent Document 5 discloses a cylinder as an object to be coated. Immersion coating apparatus having a solvent outlet for allowing the solvent of the coating solution to flow out and adhere to the inner surface of the cylindrical body held at the upper end by the cylindrical body holding apparatus in a state where the lower end of the body is opened and the upper end is sealed Is disclosed.

  Furthermore, as a liquid circulation type dip coating apparatus, Patent Document 6 discloses an overflow having a coating liquid discharge port at the bottom edge at the upper edge of the coating tank and a downward slope toward the coating liquid discharge port. A dip coating apparatus having a liquid receiving toy is disclosed, and in Patent Document 7, a shut-off valve provided in a pipe for returning a coating liquid is opened and closed based on a signal from a liquid level detecting means, and coating is performed. There has been disclosed a coating apparatus that keeps the level of the coating liquid overflowing from the tank body to the gutter member within a certain range and prevents air from entering the piping. Patent Document 8 discloses a method for producing an electrophotographic photosensitive member by laminating n photosensitive material layers on the surface of a cylindrical substrate, and the viscosity of the n-1th layer coating solution is set to the n-th layer. Under the condition that the viscosity of both the two-layer coating liquid and the n-th layer coating liquid is larger than that of the two-layer coating liquid, the n-2 layer and the n-1 layer have a solvent vapor leakage enclosure at least on the outer peripheral wall. A method is disclosed in which a dip coating apparatus provided with a tank and a stretchable hood surrounding the side of the cylindrical substrate is formed by dip coating, and the nth layer is formed by spray coating.

However, in any case, it is difficult to remove bubbles generated when the overflowed coating liquid flows to the liquid receiving plate, and there is a problem that a coating film defect occurs.
Japanese Patent No. 3286684 Japanese Patent Laid-Open No. 10-244195 JP 2003-140367 A JP 2002-323778 A JP 2000-61374 A Japanese Patent No. 3497570 JP 11-72932 A JP 2003-149836 A

In view of the problem of the prior art described above has for its object to provide a manufacturing how the photoreceptor using a coating device and a coating Engineering device capable of suppressing generation of air bubbles.

The invention according to claim 1 is a coating tank in which an object to be coated is dip coated, a tank that stores a coating liquid, and a pump that supplies the coating liquid stored in the tank to the coating tank. In a coating apparatus having at least a pipe for guiding the coating liquid overflowed from the coating tank to the tank, and a liquid receiving part that is provided on the outer peripheral surface of the coating tank and receives the coating liquid overflowed from the coating tank In addition, on the side of the liquid receiving portion that receives the coating liquid, a member having a concave curved surface portion is installed so that both ends of the concave curved surface portion are in contact with the outer peripheral surface of the coating tank and the bottom surface of the liquid receiving portion. When the concave curved surface portion is viewed in cross section, it is an arc having a radius of 5 mm or more and 200 mm or less, and the inclination angle of the bottom surface of the liquid receiving portion with respect to the outer peripheral surface of the coating tank is 90 ° or more and 170 ° or less. It is characterized by being.

According to the first aspect of the present invention, on the side of the liquid receiving portion that receives the coating liquid , a member having a concave curved surface portion includes both ends of the concave curved surface portion, the outer peripheral surface of the coating tank, and the It is installed so that the bottom surface of the liquid receiving portion is in contact, and when the concave curved surface portion is viewed in cross section, it is an arc having a radius of 5 mm or more and 200 mm or less, and the bottom surface of the liquid receiving portion with respect to the outer peripheral surface of the coating tank Since the inclination angle is 90 ° or more and 170 ° or less, it is possible to provide a coating apparatus capable of suppressing the generation of bubbles.

Invention according to claim 2, in the coating apparatus of claim 1, members having the concave surface portion is characterized in that it is detachable.

According to invention of Claim 2 , since the member which has the said concave-curved surface part is detachable, the member which has a concave-curved surface part can be changed according to coating conditions.

The invention according to claim 3 is a coating tank in which the object to be coated is dip coated, a tank for storing the coating liquid, and a pump for supplying the coating liquid stored in the tank to the coating tank. In a coating apparatus having at least a pipe for guiding the coating liquid overflowed from the coating tank to the tank, and a liquid receiving part that is provided on the outer peripheral surface of the coating tank and receives the coating liquid overflowed from the coating tank , on the receiving end of the coating liquid of the liquid receiving section, the concave surface portion is, both ends of the concave curved surface portion, is installed so that the bottom surface of the outer peripheral surface and the liquid receiving portion of the coating Engineering tank contact When the concave curved surface portion is viewed in cross section, it is an arc having a radius of 5 mm or more and 200 mm or less, and the inclination angle of the bottom surface of the liquid receiving portion with respect to the outer peripheral surface of the coating tank is 90 ° or more and 170 ° or less. It is characterized by.

According to the invention described in claim 3, the side which receives the coating liquid of the liquid receiving section, the concave surface portion is, both ends of the concave curved surface, the outer peripheral surface of the coating Engineering tank and liquid receiving portion When the concave curved surface portion is viewed in cross section, the radius is 5 mm or more and 200 mm or less, and the inclination angle of the bottom surface of the liquid receiving portion with respect to the outer peripheral surface of the coating tank is Since it is 90 ° or more and 170 ° or less, the generation of bubbles can be suppressed.

Invention of Claim 4 is a coating apparatus as described in any one of Claim 1 thru | or 3. It dip-coats the said to-be-coated body by carrying out the raising / lowering operation | movement which carries the said to-be-coated body. The pump further includes an elevator, and when the object to be coated is not immersed in the coating tank, the pump supplies the coating liquid stored in the tank to the coating tank, and the pump is supplied to the tank. The coated body is controlled to be immersed in the coating tank when the stored coating liquid is not supplied to the coating tank.

According to invention of Claim 4 , it has further the elevator which carries out the dip coating of the said to-be-coated body by carrying out the raising / lowering operation | movement which carries the said to-be-coated body, and the said to-be-coated body is in the said coating tank. When not immersed, the pump supplies the coating liquid stored in the tank to the coating tank, and the pump does not supply the coating liquid stored in the tank to the coating tank. Sometimes the coated body is controlled so as to be immersed in the coating tank, so that a good coating film can be formed.

According to a fifth aspect of the present invention, in the method for producing a photoconductor, the photoconductor is produced using the coating apparatus according to any one of the first to fourth aspects.

According to the invention described in claim 5 , since the photoconductor is manufactured using the coating apparatus according to any one of claims 1 to 4 , a photoconductor with few coating film defects can be provided. .

According to a sixth aspect of the present invention, in the method for producing a photoconductor according to the fifth aspect , the photoconductor is formed by laminating an undercoat layer, a charge generation layer, and a charge transport layer. The coating apparatus is used when forming at least one of the charge generation layer and the charge transport layer.

According to the sixth aspect of the present invention, the photoreceptor includes a subbing layer, a charge generation layer, and a charge transport layer, and at least one of the subbing layer, the charge generation layer, and the charge transport layer. Since the coating apparatus is used when forming the film, a photoconductor with few coating film defects can be obtained.

According to the present invention, it is possible to provide a manufacturing how the photoreceptor using a coating device and a coating Engineering device capable of suppressing generation of air bubbles.

  Next, the best mode for carrying out the present invention will be described with reference to the drawings.

1 shows a coating equipment of the Reference Example. The coating apparatus includes a coating tank 1 in which an object to be coated is dip-coated, a coating liquid tank 2 that stores a coating liquid, and a coating liquid 9 that is stored in the coating liquid tank 2. A liquid feed pump 4 to be supplied and a return pipe 6 that guides the coating liquid overflowed from the coating tank 1 to the coating liquid tank 2, and a liquid receiving plate 8 that receives the coating liquid led to the return pipe 6, The coating liquid tank 2 is provided in the coating liquid tank 2 so that the direction of the coating liquid flowing on the plate 8 does not become a vertical direction. The coating liquid overflowed from the coating tank 1 is returned to the coating liquid tank 2 from the return pipe 6 after being received by the liquid receiving portion 7 provided on the outer peripheral surface of the coating tank 1. Thereby, generation | occurrence | production of a bubble can be suppressed.

  As shown in FIG. 2, the liquid receiving plate 8 preferably has wall plates 8 a on both sides. Thereby, it can suppress that the coating liquid which flows on the liquid receiving plate 8 flows down from the both sides of the liquid receiving plate 8, and it becomes difficult to generate a bubble.

  Further, the insertion angle 10 of the liquid receiving plate 8 with respect to the liquid surface of the coating liquid 9 is preferably 5 ° or more and less than 90 °.

  Further, the liquid receiving plate 8 is preferably in contact with the bottom of the coating liquid tank 2. Thereby, generation | occurrence | production of a bubble can be suppressed even if the liquid level of the coating liquid 9 becomes low.

  In such a dip coating method, it is preferable to supply a coating solution having a liquid property in a predetermined range by circulating the coating solution to be applied to the substrate.

  At this time, the circulation of the coating liquid is preferably performed when the object to be coated is not immersed, and the coating liquid overflowed from the coating tank 1 flows to the liquid receiving portion 7 and passes through the return pipe 6 to form the coating liquid tank. Returning to 2, after the physical properties are adjusted with a solvent or the like, foreign matters are filtered by a filter 5 such as a cotton filter or a SUS filter, and the solution is repeatedly sent to the coating tank 1. In addition, you may perform the circulation of a coating liquid, when the to-be-coated body is immersed in the coating tank 1. FIG.

  In addition, when adding a solvent to adjust the physical properties of the coating liquid 9 in the coating liquid tank 2, it is common to stir the coating liquid 9 with the stirrer 3. It is preferable to suppress the occurrence and entrainment.

  Furthermore, when the flow rate of the coating liquid by the liquid feed pump 4 increases, cavitation occurs and bubbles are likely to be generated. Therefore, it is preferable to select an appropriate flow rate and an appropriate pump.

  When the viscosity of the coating solution is high, it is difficult to remove bubbles when bubbles are generated, and the bubbles become finer due to circulation of the coating solution and the frequency of coating film defects increases. On the other hand, when the viscosity of the coating solution is low, it is easy to defoam even if bubbles are generated. Therefore, as the viscosity of the coating solution is higher, it is preferable to reduce the impact caused by the collision of the overflowing coating solution and to suppress the generation of bubbles by setting the insertion angle 10 as the included angle.

  FIG. 3 shows a second embodiment of the coating apparatus of the present invention. In FIG. 3, the same components as those of the coating apparatus shown in FIG. In this coating apparatus, a concave jig 11 is provided in the liquid receiving portion 7. Thereby, the impact when the coating liquid overflowed from the coating tank 1 flows into the liquid receiving part 7 is alleviated, and the generation of bubbles can be suppressed.

  The concave curved surface portion of the concave jig 11 is an R shape having no flat surface portion. Further, the contact portion between the concave portion of the concave jig 11 and the outer peripheral surface of the coating tank 1 and the bottom surface of the liquid receiving portion 7 is parallel to the outer peripheral surface of the coating tank 1 and the bottom surface of the liquid receiving portion 7, respectively. It is preferable that it is installed in.

  In such a coating apparatus, the inclination angle 12 and the R shape may be set according to conditions such as the viscosity of the coating liquid, the amount of the coating liquid that overflows and flows when immersed, and the circulation of the coating liquid when forming the coating film.

  The installation conditions for the concave jig 11 may be fixed and set from the production stage of the coating device, or may be a removable device so that it can be set to an appropriate R shape.

  The inclination angle 12 of the bottom surface of the liquid receiving portion 7 with respect to the outer peripheral surface of the coating tank 1 is preferably 90 ° or more and less than 170 °, more preferably 120 to 150 °, and particularly preferably 135 °.

  As shown in FIG. 3, when the concave curved surface portion of the concave jig 11 is viewed in cross section, it is preferably an arc having a radius of 5 mm to 200 mm, more preferably an arc having a radius of 30 mm to 150 mm, An arc having a radius of 100 mm is particularly preferable.

  When the viscosity of the coating solution is high, it is difficult to remove bubbles when bubbles are generated, and the bubbles become finer due to circulation of the coating solution and the frequency of coating film defects increases. On the other hand, when the viscosity of the coating solution is low, it is easy to defoam even if bubbles are generated. Therefore, as the viscosity of the coating solution increases, it is preferable to reduce the impact caused by the collision of the overflowing coating solution and suppress the generation of bubbles by increasing the inclination angle 12 and increasing the R shape.

  FIG. 4 shows a third embodiment of the coating apparatus of the present invention. In FIG. 4, the same components as those of the coating apparatus shown in FIGS. 1 and 3 are denoted by the same reference numerals and description thereof is omitted. In this coating apparatus, the liquid receiving portion 7 has a concave curved surface portion. Thereby, the impact when the overflowed coating liquid flows to the liquid receiving part 7 is alleviated, and the generation of bubbles can be suppressed.

  The concave curved surface portion of the liquid receiving portion 7 has an R shape with no flat portion. Further, the concave curved surface portion and the contact portion between the outer peripheral surface of the coating tank 1 and the bottom surface of the liquid receiving portion 7 are installed so as to be parallel to the outer peripheral surface of the coating tank 1 and the bottom surface of the liquid receiving portion 7, respectively. It is preferable.

  In such a coating apparatus, the inclination angle 12 and the R shape may be set according to conditions such as the viscosity of the coating liquid, the amount of the coating liquid that overflows and flows when immersed, and the circulation of the coating liquid when forming the coating film.

  The installation conditions for the concave jig 11 may be fixed and set from the production stage of the coating device, or may be a removable device so that it can be set to an appropriate R shape.

  As shown in FIG. 4, when the concave curved surface portion of the liquid receiving portion 7 is viewed in cross section, an arc having a radius of 5 mm to 200 mm is preferable, an arc having a radius of 30 mm to 150 mm is more preferable, and the radius is An arc of 100 mm is particularly preferred.

  When the viscosity of the coating solution is high, it is difficult to remove bubbles when bubbles are generated, and the bubbles become finer due to circulation of the coating solution and the frequency of coating film defects increases. On the other hand, when the viscosity of the coating solution is low, it is easy to defoam even if bubbles are generated. Therefore, it is preferable that the higher the viscosity of the coating solution, the wider the inclination angle 12 and the larger the R shape, so that the impact caused by the collision of the overflowing coating solution is alleviated and the generation of bubbles is suppressed.

  In the method for producing a photoreceptor of the present invention, a conductive substrate such as a cylindrical substrate is used as an object to be coated, and the photoreceptor is produced by dipping in the coating tank 1 of the coating apparatus of the present invention and then pulling it up. To do. At this time, since the coating liquid in the coating tank 1 is in a good state in which bubbles are not easily generated, a photoconductor with few coating film defects can be obtained.

  The method for producing a photoreceptor of the present invention can produce a photoreceptor in which an undercoat layer, a charge generation layer and a charge transport layer are laminated on a conductive substrate. The undercoat layer, the charge generation layer and the charge transport layer can be produced. The coating apparatus of the present invention can be used when forming at least one of the above.

  The image forming apparatus of the present invention has the photoreceptor of the present invention manufactured as described above.

( Reference Example 1)
90 parts by weight of titanium dioxide, 15 parts by weight of alkyd resin Beccosol 1307-60-EL (manufactured by Dainippon Ink and Science), 10 parts by weight of melamine resin Super Becamine G-821-60 (manufactured by Dainippon Ink and Scientific) An undercoat layer coating solution comprising 600 parts by weight of methyl ethyl ketone was prepared.

  An undercoat layer having a film thickness of 5 μm was formed on an aluminum cylindrical substrate having a diameter of 100 mm by a dip coating method using the coating apparatus and the undercoat layer coating solution of FIG. At this time, the insertion angle 10 of the liquid receiving plate 8 with respect to the liquid surface of the coating liquid 9 was set to 85 ° or less.

The state of the coating solution in the coating tank was good, and there was no occurrence of coating unevenness due to bubbles.
(Comparative Example 1)
An undercoat layer was formed in the same manner as in Reference Example 1 except that the insertion angle 10 was set to 90 °.

Fine bubbles floated in the coating solution of the coating tank, and coating unevenness due to this was generated.
( Reference Example 2)
Chemical structural formula

で示されるアゾ顔料４５重量部、ポリビニルブチラール樹脂Ｂｕｔｖａｒ Ｂ−９０（Ｍｏｎｓａｎｔ社製）４．５重量部及びメチルエチルケトン２４００重量部からなる電荷発生層塗布液を調製した。

A charge generation layer coating solution comprising 45 parts by weight of the azo pigment represented by the formula, 4.5 parts by weight of polyvinyl butyral resin Butvar B-90 (manufactured by Monsant) and 2400 parts by weight of methyl ethyl ketone was prepared.

A charge generation layer having a thickness of 0.5 μm was formed on the cylindrical substrate on which the undercoat layer was formed in Reference Example 1 by the dip coating method using the coating apparatus and the charge generation layer coating solution of FIG. At this time, the insertion angle 10 was set to 85 ° or less.

The state of the coating solution in the coating tank was good, and there was no occurrence of coating unevenness due to bubbles.
(Comparative Example 2)
A charge generation layer was formed in the same manner as in Reference Example 2 except that the cylindrical substrate on which the undercoat layer was formed in Comparative Example 1 was used and the insertion angle 10 was set to 90 °.

Fine bubbles floated in the coating solution of the coating tank, and coating unevenness due to this was generated.
( Reference Example 3)
Chemical structural formula

で示される電荷発生材料１８０重量部、ポリカーボネート樹脂ＴＳ−２０５０（帝人化成社製）２５０重量部、テトラヒドロフラン１５２０重量部及びシリコーンオイルＫＦ−５０−１００ＣＳ（信越シリコーン社製）０．０４重量部からなる電荷輸送層塗布液を調製した。

180 parts by weight of the charge generating material represented by the formula, 250 parts by weight of polycarbonate resin TS-2050 (manufactured by Teijin Chemicals), 1520 parts by weight of tetrahydrofuran and 0.04 parts by weight of silicone oil KF-50-100CS (manufactured by Shin-Etsu Silicone). A charge transport layer coating solution was prepared.

Using the coating apparatus and the charge transport layer coating solution of FIG. 1, a charge transport layer having a thickness of 30 μm is formed on the cylindrical substrate in which the charge generation layer is formed on the undercoat layer in Reference Example 2 by the dip coating method. A photoconductor was prepared. At this time, the insertion angle 10 was set to 85 ° or less.

  The image quality formed by the obtained photosensitive member was evaluated using a digital copying machine, Image Neo 600 (manufactured by Ricoh).

In terms of appearance, there was no coating unevenness in the undercoat layer and the charge generation layer, and no density unevenness could be detected in the printed halftone image.
(Comparative Example 3)
A charge transport layer was formed in the same manner as in Reference Example 3 except that the cylindrical substrate having a charge generation layer formed on the undercoat layer in Comparative Example 2 was used and the insertion angle 10 was set to 90 °. Produced.

  The image quality formed by the obtained photosensitive member was evaluated using a digital copying machine Imagio Neo600.

In appearance, a dot-like coating film due to bubbles was seen in the charge generation layer, and density unevenness could be detected in the printed halftone image.
Example 4
Using the coating apparatus of FIG. 3 and the undercoat layer coating solution of Reference Example 1, an undercoat layer having a thickness of 5 μm was formed on the cylindrical substrate by a dip coating method. At this time, the inclination angle 12 was set to 90 °, and the concave curved surface portion of the concave jig 11 was set to R200.

The state of the coating solution in the coating tank was good, and there was no occurrence of coating unevenness due to bubbles.
(Comparative Example 4)
An undercoat layer was formed in the same manner as in Example 4 except that the concave jig 11 was not attached.

When the cylindrical substrate is immersed in the coating tank 1, generation of bubbles is confirmed when the overflowing coating liquid flows from the coating tank 1, flows into the coating liquid tank 2, and further, bubbles are generated in the coating tank 1. Uneven coating occurred due to mixing and bubbles.
(Example 5)
Using the coating apparatus of FIG. 3 and the charge generation layer coating solution of Reference Example 2, a charge generation layer having a thickness of 0.5 μm was formed on the cylindrical substrate on which the undercoat layer was formed in Example 4 by the dip coating method. . At this time, the inclination angle 12 was set to 90 °, and the concave curved surface portion of the concave jig 11 was set to R200.

The state of the coating solution in the coating tank was good, and there was no occurrence of coating unevenness due to bubbles.
(Comparative Example 5)
A charge generation layer was formed in the same manner as in Example 5 except that the cylindrical substrate on which the undercoat layer was formed in Comparative Example 4 was used and the concave jig 11 was not attached.

When the cylindrical substrate is immersed in the coating tank 1, the generation of bubbles is confirmed when the overflowing coating liquid flows from the coating tank 1, flows into the coating liquid tank 2, and further bubbles are generated in the coating tank 1. Uneven coating occurred due to mixing and bubbles.
(Example 6)
Using the coating apparatus of FIG. 3 and the charge transport layer coating solution of Reference Example 3, a charge transport layer having a film thickness of 30 μm is formed on the cylindrical substrate in which the charge generation layer is formed on the undercoat layer in Example 5 by the dip coating method. To form a photoreceptor. At this time, the inclination angle 12 was set to 90 °, and the concave curved surface portion of the concave jig 11 was set to R200.

  The image quality formed by the obtained photosensitive member was evaluated using a digital copying machine Imagio Neo600.

In terms of appearance, no bubbles were generated in all of the undercoat layer, the charge generation layer, and the charge transport layer, and even in a printed halftone image, unevenness in image density could not be detected, which was good.
(Comparative Example 6)
A charge transport layer was formed in the same manner as in Example 6 except that the cylindrical substrate having the charge generation layer formed on the undercoat layer in Comparative Example 5 was used and the concave jig 11 was not mounted. Was made.

  The image quality formed by the obtained photoreceptor was evaluated using a digital copying machine Imagio Neo600.

The photoreceptor had concave coating unevenness due to bubbles in the undercoat layer and the charge generation layer, and convex bubbles adhered to the charge transport layer. Further, in the printed halftone image, it was possible to detect unevenness in image density and missing images.
(Example 7)
A photoconductor was prepared in the same manner as in Example 6 except that the inclination angle 12 was set to 170 ° and the concave curved surface portion of the concave jig 11 was set to R5.

  The image quality formed by the obtained photoreceptor was evaluated using a digital copying machine Imagio Neo600.

In terms of appearance, no bubbles were generated in all of the undercoat layer, the charge generation layer, and the charge transport layer, and even in a printed halftone image, unevenness in image density could not be detected, which was good.
(Comparative Example 7)
A photoconductor was prepared in the same manner as in Example 7 except that the inclination angle 12 was set to 80 ° and the concave curved surface portion of the concave jig 11 was set to R3.

  The image quality formed by the obtained photoreceptor was evaluated using a digital copying machine Imagio Neo600.

  A large number of bubbles were observed and mixed in the coating liquid, resulting in coating unevenness, convex coating film defects, and concave coating film defects formed by bubbles bursting. Further, in the printed halftone image, it was possible to detect density unevenness and image loss.

It is a diagram showing a coating equipment of the Reference Example. FIG. 2 is a detailed view of the liquid receiving plate in FIG. 1. It is a figure which shows 2nd Embodiment of the coating apparatus of this invention. It is a figure which shows 3rd Embodiment of the coating apparatus of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Coating tank 2 Coating liquid tank 3 Stirrer 4 Liquid feed pump 5 Filter 6 Return piping 7 Liquid receiving part 8 Liquid receiving plate 8a Wall board 9 Coating liquid 10 Insertion angle 11 Concave-shaped jig 12 Inclination angle

Claims (6)

A coating tank in which the object to be coated is dip-coated, a tank for storing the coating liquid, a pump for supplying the coating liquid stored in the tank to the coating tank, and an application overflowing from the coating tank In a coating apparatus having at least a liquid receiving portion that is provided on the outer peripheral surface of the coating tank and that guides the liquid to the tank and receives the coating liquid overflowed from the coating tank,
On the side of the liquid receiving portion that receives the coating liquid, a member having a concave curved surface portion is installed so that both ends of the concave curved surface portion are in contact with the outer peripheral surface of the coating tank and the bottom surface of the liquid receiving portion. And
A cross-sectional view of the concave curved surface portion is an arc having a radius of 5 mm or more and 200 mm or less,
An inclination angle of the bottom surface of the liquid receiving portion with respect to the outer peripheral surface of the coating tank is 90 ° or more and 170 ° or less . The coating apparatus according to claim 1 , wherein the member having the concave curved surface portion is detachable. A coating tank in which the object to be coated is dip-coated, a tank for storing the coating liquid, a pump for supplying the coating liquid stored in the tank to the coating tank, and an application overflowing from the coating tank In a coating apparatus having at least a liquid receiving portion that is provided on the outer peripheral surface of the coating tank and that guides the liquid to the tank and receives the coating liquid overflowed from the coating tank,
On the receiving end of the coating liquid of the liquid receiving section, the concave surface portion is, both ends of the concave curved surface portion, is installed so that the bottom surface of the outer peripheral surface and the liquid receiving portion of the coating Engineering bath contact,
A cross-sectional view of the concave curved surface portion is an arc having a radius of 5 mm or more and 200 mm or less,
Inclined with respect to the outer peripheral surface of the coating Engineering tank bottom of the liquid receiving portion angle, the coating apparatus you characterized in that at least 90 ° 170 ° or less. Further comprising an elevator for dip-coating the coated body by carrying the lifting operation while carrying the coated body;
When the object to be coated is not immersed in the coating tank, the pump supplies the coating liquid stored in the tank to the coating tank,
The coated body is controlled to be immersed in the coating tank when the pump does not supply the coating liquid stored in the tank to the coating tank. Item 4. The coating apparatus according to any one of Items 1 to 3 . Method for producing a photosensitive member, characterized in that to produce a photosensitive member by using the coating apparatus according to any one of claims 1 to 4. The photoreceptor is laminated with an undercoat layer, a charge generation layer, and a charge transport layer,
6. The method for producing a photoreceptor according to claim 5 , wherein the coating apparatus is used when forming at least one of the undercoat layer, the charge generation layer, and the charge transport layer.

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