JPS60158453A - Manufacture of recording body of electrophotographic sensitive body or the like - Google Patents

Abstract

PURPOSE:To prevent tearing or the like after coating and to enable an image uniform in film thickness to be formed by dipping a substrate into a coating fluid to coat the substrate, and forcing the attached fluid to be dried soon after coating. CONSTITUTION:A substrate 2 is dipped in a coating fluid contained in a cylinder 1, coated with said fluid, and dried forcibly in a drying zone installed near the cylinder 1 successively after the coating to form the recording body of a phtosensitive body or the like. Such a drying zone means a zone capable of preventing a coating film attached to the substrate from tearing in the range from the start of compulsive drying to its end, and when needed, a natural drying stage may be provided. Execution of such compulsive drying in a drying zone successively to the coating permits tearing, blushing, etc. of the coating film to be prevented, a uniformly thick film to be obtained and drying to be executed effectively, accordingly, a uniformly thick undercoat layer and a photosensitive layer to be formed on a substrate, and this process to be used not only for manufacture of an electrophotographic sensitive body but also for other electrostatic recording body, etc..

Description

[Detailed Description of the Invention] [Technical 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 for manufacturing a recording medium such as an electrophotographic photoreceptor, which can obtain a desired uniform ++a thickness by performing drying after coating with IrJ in succession to coating.

[Prior Art] Conventionally, a method of manufacturing an electrophotographic photoreceptor by dipping a cylindrical support in a coating liquid containing a photosensitive material and coating the same is known as a dip coating method (Japanese Patent Application Laid-Open No. 1989-1992). -1
See Publication No. 39736, etc.! Bu). In such a dip coating method, obtaining a uniform film thickness is an extremely important issue, and from this point of view, a technique for changing the initial and final coating speeds is known, as described in Japanese Patent Application Laid-Open No. 57-5048. However, even this technology cannot solve the problem of dripping of the coating liquid. Therefore, on January 11, 1981, the applicant
In the specification attached to the application for filing (title of invention: method and apparatus for manufacturing recording bodies such as electrophotographic photoreceptors), it is stated that the coating speed is constant and the pulling speed of the support is increased. We have proposed a technique that can suppress dripping of the coating liquid by drying it as quickly as possible after pulling.

As a result of continuing research on the previously proposed technology, the present inventor found that in the previously proposed technology, when drying is performed by installing a dryer separately from the solinter as in the past, drying becomes complicated and the distance to the dryer increases. There is a drawback that brushing occurs due to humidity due to contact with outside air during transfer, and depending on the type of coating liquid, liquid drips during transfer, making it impossible to completely satisfy the above requirements. I discovered that there is a problem. It has also been found that such a problem is not limited to the previously proposed technique, but is a common problem that occurs when the coating device and dryer are discontinuous as in the prior art.

[Object of the Invention] Therefore, an object of the present invention is to provide a method for producing a recording medium such as an electrophotographic photoreceptor, which is used for drying after dip coating and solves the conventional drawbacks and inconveniences at once.

Another object of the present invention is to provide a method for producing a recording medium such as an electrophotographic photoreceptor, which can quickly dry the coating solution after coating to eliminate sagging of the coating solution and obtain a uniform film thickness.

[Structure of the Invention] The above-mentioned object of the present invention is to provide a method for manufacturing a recording medium such as an electrophotographic photoreceptor, in which a cylinder is dipped in a coating solution and then dried, in which a drying zone is provided in the vicinity of the cylinder. This is achieved by a method for manufacturing a recording medium such as an electrophotographic photoreceptor, characterized in that the coating is followed by forced drying.

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

FIG. 1 is an explanatory view showing an embodiment of the present invention, and FIG. 2 is a perspective view showing an example of an apparatus for carrying out the method of the present invention.

In the figure, ■ is a cylinder, and 2 is a cylindrical support with a sealed top. As shown in the figure, the support 2 is immersed in the coating liquid in the cylinder 1, and then the support 2 is pulled up and coated. The material of the support 2 includes, for example, aluminum, nickel, copper, zinc, palladium, silver,
Metals such as indium, tin, platinum, gold, iron, stainless steel, and brass are used.

Note that the coating method to which the method of the present invention can be applied is not limited to the above. For example, a ring-shaped rubber elastic coating valve is provided at the bottom of the cylinder, a support is inserted from below the coating valve, and a small amount inside the cylinder is coated. It can also be applied to the so-called continuous dip coating method (see Japanese Patent Laid-Open No. 101149/1983) in which coating is performed using a specific coating liquid.

3 is a dryer 3 that forcibly dries the support 2 after coating while it is being pulled upward;
It is removably fixed in part. The dryer is, for example, a second dryer.
It can be configured as shown in the figure. In the figure, 4 is a main body of the dryer, and 5 is a through hole formed in the main body 4 in a band shape. A jacket 6 is fixed around the main body 4 so as to cover the through hole 5, one or more pipes 7 are connected to the jacket 6, and a blower 8 is connected to the pipe 7. The structure is such that suction can be performed by the blower 8. 9 is an opening in the upper part of the main body 4, and 10 is a suction pipe provided at the upper end of the cylinder as necessary.

The drying zone in the present invention refers to at least a zone from the beginning of forced drying (drying other than natural drying) to the end of forced drying in which dripping of the coated support can be prevented, and the drying zone The final stage of drying may be reached by drying, or drying such as natural drying may be continued after leaving the drying zone.

In the present invention, it is not necessary that such a drying zone is physically formed in one piece at the top of the cylinder, and it is only necessary that continuous drying can be performed after application.

The drying means using the dryer will be explained with reference to FIG. 1. First, the coated support 2 moves up the drying zone in the dryer 3. Next, the blower 8 is operated to start suction. In the drying zone, external air taken in through the opening 9 and the suction pipe 10 is sucked into the jacket 6 through the through holes 5, creating an air flow and thereby drying the paint film. being moved aside.

Note that the shape of the through hole 5 may be a slit shape in the circumferential direction.

'' is the case when the suction force type by the blower 8 is used, but on the contrary, for example, as shown in FIG. Connect to the jacket 1 provided above, send air (humidity-controlled air is preferable) from the outlet II' in the jacket 11, and discharge the air from the through hole 5 or other outlet. (In this case, a blower 8' for suction may be added), and a drying zone may be provided by an air discharge method.

Further, a plurality of drying zones may be provided in the direction of movement of the support 2, and the conditions of each drying zone may be changed.

Note that the drying means is not limited to air drying as described above, but it is also possible to dry using a heat source (for example, an electric coil, an infrared lamp, etc.).

[Effect of the invention] According to the invention, since a drying zone is provided and forced drying is performed continuously after coating, dripping of the coating solution can be eliminated and a uniform film thickness can be obtained, and the coating after dip coating can be In particular, the method of the present invention has the effect that drying can be effectively carried out. ) can be formed.

Although the present invention is preferably used for coating electrophotographic photoreceptors, it can also be used for coating 1[5 of other recording bodies capable of retaining electrostatic charges.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing an embodiment of the present invention, Fig. 2 is a perspective view showing an example of a device for carrying out the method of the present invention, and Fig. 3 is an explanatory diagram showing another embodiment of the invention. be. In the figure, l indicates a cylinder, 2 indicates an upper sealed cylindrical support, and 3 indicates a dryer. 4.Applicant Roku Konishi Photo Industry Co., Ltd. Agent
Patent attorney Nobuaki Sakaguchi (and 1 other person)

Claims (1)

[Claims] In a method for manufacturing a recording medium such as an electrophotographic photoreceptor, in which a cylinder is dipped in a coating solution and then dried, a drying zone is provided in the vicinity of the cylinder, and a drying zone is provided in the vicinity of the cylinder, and the coating is forcibly continued after the coating. A method for producing a recording medium such as an electrophotographic photoreceptor, which comprises drying.