JPS61205944A - Production of recording body such as electrophotographic sensitive body - Google Patents

Abstract

PURPOSE:To form a uniform coated film on a photosensitive body by providing an oscillation absorbing member to part of a line for drawing a coating liquid into which the photosensitive body in a cylinder is dipped. CONSTITUTION:The coating is executed by dipping preliminarily the entire lower part of the photosensitive body 2 except the upper part thereof in the coating liquid in the cylinder 1 fed from a supply tank 3 and starting a metering pump 8 to draw the coating liquid. The coating liquid passes through the oscillation absorbing member 9 of a drawing line 7. The oscillation at the start of the pump 8 or during the operation thereof is thus absorbed and the oscillation or the like of the coating liquid surface is eliminated. The uniform coated film is formed on the photosensitive body.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for manufacturing a recording medium such as an electrophotographic photoreceptor,
In particular, the present invention relates to a method of manufacturing a recording medium such as an electrophotographic photoreceptor, which can eliminate coating unevenness and obtain a uniform film thickness.

[Prior Art] A method of manufacturing an electrophotographic photoreceptor by using a method is known as a dip coating method (Japanese Patent Application Laid-Open No. 130736/1989,
(See Publication No. 50-26, etc.).

[Problems to be Solved by the Invention] However, the method described in JP-A-49-130736 uses a technique of coating by lifting the support from the coating solution. However, in such technology,
Since it is difficult to maintain the stability of the liquid level due to mechanical vibration during pulling up, there are drawbacks such as uneven coating on the support.

As a technique for solving this drawback, a method is known in which the coating liquid is applied by drawing it out using a metering pump, as described in JP-A-50-26.

However, in this coating method, dip coating is performed using a coating liquid drawing device in which a metering pump and a cylinder cylinder are connected by fixed piping. However, according to this coating method, it was found that coating unevenness occurred and a uniform coating film could not be obtained in the end.

With the spear, Juryo's attack remains J + Furious, giving up, or Kaori The current situation has become clear. In other words, vibrations generated from the metering pump itself, such as vibrations caused by gear engagement in a gear pump or membrane movement in a diaphragm pump, or vibrations from the metering pump driving motor, are transmitted to the coating liquid in the cylinder.
This vibration is affected not only at the start of coating but also during coating. As a result, it was found that uneven coating occurred and a uniform coating film could not be obtained in the end.

Therefore, it is a technical object of the present invention to provide a method for manufacturing a recording medium such as an electrophotographic photoreceptor, which can eliminate the above-mentioned coating unevenness and obtain a uniform film thickness.

[Means for Solving the Problems] The present invention has been developed as a result of diligent studies to solve the above problems.
The present invention has now been completed.

That is, in the method of manufacturing a recording medium such as an electrophotographic photoreceptor according to the present invention which solves the above problems, a pump is used to draw out the coating liquid from which a cylindrical support placed in a cylinder is immersed. In a method for manufacturing a recording medium such as an electrophotographic photoreceptor in which coating is performed by lowering a surface, a vibration absorbing member is provided at least in a part of a line connecting the pump and the cylinder, and the coating is performed after passing through line 1j11. Characterized by drawing out liquid.

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a cross-sectional view of an embodiment of a preferred apparatus for carrying out the method of the invention.

In the figure, l is a cylinder and 2 is a cylindrical support. Although the shape of the cylinder 1 is not particularly limited, it is preferably cylindrical, for example, and its inner diameter is slightly larger than the outer diameter of the support body 2.

It is preferable to reduce the gap between the cylinder 1 and the support 2.

The support 2 is made of aluminum, for example.

Metals such as nickel, copper, zinc, palladium, silver, indium, tin, platinum, gold, iron, stainless steel, and aluminum are used, but are not limited to these. A coating containing metal powder such as aluminum powder, carbon powder, tin oxide powder, titanium oxide powder, etc. may be provided, and the conductive coating may be applied to a non-conductive material such as film, paper, or plastic. Also suitable are those provided with a metal such as aluminum or the like deposited or laminated with a metal such as aluminum.

Note that the cylindrical shape in the shape of the support 2 is not particularly limited to the shape of both ends, as long as at least the body part (image forming part) is cylindrical. Members or portions of other shapes may also be added.

3 is a supply tank for supplying the coating liquid to the cylinder 1, and 4 is a line for supplying the coating liquid from the supply tank 3 to the cylinder 1. The supply line 4 is provided with, for example, a supply pump 5. The supply pump 5 is not particularly limited, but preferably one that allows fine adjustment of the flow rate. Note that it is preferable that the supply line 4 is provided with a circulation line 6 for stirring the coating liquid in the supply tank 3.

It is a drawing line to be pulled out, and 8 is a pump.

In this embodiment, a metering pump is used. The metering pump 8 used in this embodiment is not particularly limited, but it is preferably one that can supply a relatively small amount at a constant rate and can change the meteor as necessary, for example. Reciprocating pumps such as diaphragm pumps and plunger pops, rotary pumps such as gear pumps, etc. are used, but rotary pumps are preferred. Note that the pump is not limited to a metering pump, and other pumps can also be used.

Reference numeral 9 denotes a vibration absorbing member provided in at least a portion of the drawing line 7. Only one vibration absorbing member 9 may be provided in the middle of the drawing line 7 as shown in the figure, or a plurality of vibration absorbing members 9 may be provided, and furthermore, the entire drawing line 7 may be a vibration absorbing member. Good too.

The vibration absorbing member 9 is not particularly limited as long as it is a member capable of absorbing the vibrations mentioned above, and any member can be used. The one formed by IJ is used. Elastic rubber or the like is used as the member.

In this embodiment, the supply pump 5 and the cylinder 1
The vibration absorber in the supply line 4 between! It is preferable to provide a vibration absorbing member similar to A9.

An example of the coating method according to the present invention will be described below using the above preferred apparatus.

The coating liquid is supplied from the coating liquid supply tank 3 into the cylinder 1 using the supply pump 5, and the cylinder 1 is filled with the coating liquid up to the position shown in FIG. At this time, the support 2 is not immersed as shown in the figure.

Next, the lower part of the support 2 is immersed in the coating solution, leaving the upper part intact.

Next, the metering pump 8 is started to draw out the coating liquid and perform coating. When the coating liquid is drawn out, the coating liquid passes through the vibration absorbing member 9.

Therefore, even when the metering pump 8 is started or in operation, vibrations caused by the pump or motor can be absorbed. Therefore, coating can be performed without any fluctuation of the coating liquid level in the cylinder 1, and uneven coating will not occur.

In addition, in the present invention, it is preferable to take measures such as prevention of welding/8-shot during coating. Further, as shown in Japanese Patent Application No. 59-1306 and No. 59-1307 filed by the present applicant, shearing force may be applied to the coating solution before coating the support. Furthermore, as shown in patent application (C) filed on the same date, the coating liquid may be supplied in two stages.

By the method of the present invention, a subbing layer can be formed by applying a coating liquid to a support ball, and a photosensitive layer (carrier generation layer and/or
or a carrier transport layer), a protective layer, etc.

When forming an undercoat layer, a solution that improves the adhesion between the support and the photosensitive layer is selected as the coating liquid. When forming a carrier generation layer, for example, an organic pigment is dispersed or dissolved and contained in the coating liquid.

Examples of the organic pigment include the following.

P-(1) Azo pigments such as monoazo pigments, bisazo pigments, trisazo pigments, polyazo pigments, metal complex azo pigments, pyrazolone azo pigments, stilbene azo pigments, thiazole azo pigments P-(2) Perylene acid anhydride, perylene acid imide Perylene pigments P-(3) Anthraquinone to polycyclic quinone pigments such as anthraquinone derivatives, anthanthrone derivatives, dibenzpyrenequinone derivatives, vilanthrone derivatives, violanthrone derivatives, inviolanthrone derivatives P-(4) Indigo derivatives , indigoid pigments such as thioindigo derivatives p-(5) Phthalocyanine pigments such as gold f-1, phthalocyanine, metal-free phthalocyanine p-(e) Perinone pigments such as bisbenzimidazole derivatives P-(7) Quinacridone pigments p-(a) Quinoline pigment When forming a carrier transport layer by the method of the present invention, the carrier transport substance used together with the binder resin is generally classified into electron donating substances and electron accepting substances.
It is appropriately selected from a large number of organic compounds. Specifically, the following compounds described in JP-A-57-67934 and the like can be used.

T-(1) Carbazole derivative T-(2) Pyrazoline derivative T-(3) Oxadianol derivative T-(4) Triarylamine derivative T-(5) Stilbene derivative T-(8) Polyarylalkane derivative T-(7) ) Hydrazone derivative T-(8) Imidazole derivative T-(9) Triazole derivative? -(10) Phenylenediamine derivative T-(11)
) Linitrofluorenone derivative T-(12) Substituted chalcone derivative [Effects of the invention] According to the present invention, when the coating liquid in the cylinder is drawn out and applied using the metering pump, the constant-abrasive pump and the cylinder are connected. Since the coating liquid is drawn out by passing through a vibration absorbing member provided on at least a part of the connecting line, a uniform coating film is formed without causing uneven coating on the coating surface.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of an embodiment of a preferred apparatus for carrying out the method of the invention. In the figure, ■ indicates a cylinder, 2 indicates a cylindrical support, 8 indicates a metering pump, and 9 indicates a vibration absorbing member.

Claims (1)

[Claims] A method for producing a recording medium such as an electrophotographic photoreceptor, in which a cylindrical support placed in a cylinder is immersed in a coating liquid is drawn out using a pump, and the coating liquid is lowered to lower the level of the coating liquid. A method for producing a recording medium such as an electrophotographic photoreceptor, characterized in that a vibration absorbing member is provided on at least a part of a line connecting the line to a cylinder, and the coating liquid is drawn out by passing through the line.