JPH03212646A - Drying device for organic film - Google Patents

Abstract

PURPOSE:To uniformize the drying of an org. film and to simplify the drying device by holding a cylindrical object coating with the org. film so as to be concentrical with a cylindrical radiator and heating and drying the org. film by the electromagnetic waves from the above-mentioned radiator. CONSTITUTION:The cylindrical radiator 1 of a desired length to radiate the electromagnetic waves within a 3 to 100mum range and the cylindrical holder 3 are so disposed on a base plate 4 as to be concentrically positioned. The cylindrical object 2 coated with the org. film on the outside surface is set on the holder 3 and the coated film of the object 2 is heated and dried by the electromagnetic waves (e.g.: IR rays) radiated form the inside surface of the radiator 1. The radiator 1 of the diameter smaller than the diameter of the object 2 is concentrically disposed on the inner side of the object 2 to heat and dry the org. film when the org. film is formed on the inside surface of the object 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an organic film drying apparatus for uniformly drying a functional organic film coated on the surface of a cylindrical object so as to have a smooth surface.

[Conventional technology]

Conventionally, when forming an organic coating film on a cylindrical or complex-shaped substrate, a heat convection drying device is used to dry the coating film after it has been applied. In particular, in the case of functional coatings, in consideration of the loss of functionality due to heat, they are gradually dried over a long period of time in a slightly low temperature atmosphere or in an atmosphere with a temperature gradient from low to high temperature. By doing so, the surface smoothness and functionality of the coating film were maintained. However, the above drying method requires complicated temperature conditions. There were drawbacks such as the volume of the high-temperature atmosphere becoming large.

In recent years, electromagnetic heating drying, especially drying using infrared rays, has attracted attention. An advantage of using infrared rays is that the electromagnetic waves act directly on the object to be heated, so a high temperature atmosphere is not required. In addition, since energy is directly applied to the object to be heated, there is little loss and it is economical. It is said to be able to shorten drying time, and is being applied to various fields in addition to general drying.

[Problem to be solved by the invention]

However, when putting heating drying using electromagnetic waves into practical use, it is necessary to maintain a constant distance between the electromagnetic wave radiator and the coating film in order to uniformly irradiate electromagnetic waves to the coating film applied on a non-flat object and dry it uniformly. This necessitates operations such as rotating the object while keeping it in place, which poses a problem in that the mechanism of the drying device becomes complicated. In particular, in the case of functional coating films, even higher heating uniformity is required because variations in heating greatly affect the functionality and cause variations.

This invention was made in view of the above points, and
An object of the present invention is to provide a drying device that can dry a coating film accurately and uniformly and has a simple mechanism, which is suitable for coating and forming a functional organic film on the surface of a cylindrical object. Take it as a challenge.

[Failure to solve the problem]

According to the present invention, the above problem can be solved when the wavelength is 3 μm or more and 1
A cylindrical radiator that emits electromagnetic waves in a range of 00 μm or less, and a cylindrical object having a diameter different from that of the cylindrical radiator, are held so that they are concentric with the cylindrical radiator and overlap in the length direction. an organic film having a structure in which an organic film coated on a surface of a cylindrical object held by the holding mechanism facing the cylindrical radiator is heated and dried by the electromagnetic waves emitted from the cylindrical radiator. Solved by membrane drying equipment.

[Effect]

By holding the cylindrical object so that its axis is concentric with the cylindrical radiator and its length direction overlaps, the intervals between the surfaces facing each other are uniform and evenly spaced, and the surface of the latter facing the former The applied organic film is heated and dried very uniformly over the entire surface. Therefore, there is no need to rotate the cylindrical object for uniform drying.

〔Example〕

FIG. 1 is a conceptual diagram of an embodiment of an organic film drying apparatus of the present invention, with FIG. 1(a) showing a top view and FIG. 1 et al.) showing a longitudinal sectional view.

In Fig. 1, a cylindrical electromagnetic wave radiator 1 and a cylindrical holder 3 are arranged on a base 4 so as to have concentric axes. A shaped object 2 is held concentrically with the cylindrical radiator 1 and so that their lengths overlap, and electromagnetic waves 1 emitted from the inner surface of the cylindrical radiator 1, for example, infrared rays, are applied to the outer surface of the cylindrical object 2. The organic film coated on the surface is uniformly heated and dried.

Using such an apparatus, an electrophotographic organic photoreceptor including a photosensitive layer as a functional organic film was produced. The cylindrical radiator is made of a ceramic material, and the outer surface of the cylindrical radiator is coated with a dichloromethyl solution containing an organic photoconductive material.The cylindrical radiator is set in a holder as a cylindrical object. The coated film is dried by infrared rays from the photosensitive layer to form a photosensitive layer. At that time, the heating temperature and heating time of the cylindrical object were changed as shown in Table 1, and Examples 1 to 1 were
No. 4 photoreceptor was produced.

For comparison, photoreceptors of Comparative Examples 1 to 3 were prepared by drying the coating film using a conventional thermal convection method and changing the heating temperature and heating time as shown in Table 1. .

The thus obtained photoreceptor was examined for adhesion, surface properties, and uniformity of the photosensitive layer, and its electrical properties were evaluated. The results are also shown in Table 1.

As shown in Table 1, by drying the organic coating film with infrared rays, an organic film with less variation in surface properties and film quality can be obtained. It is clear that it is superior to . Also,
It can be seen that the drying time of the coating film can also be shortened.

The above example is a case where an organic film is formed on the outer surface of a cylindrical object, but when an organic film is formed on the inner surface of a cylindrical object, conversely, a cylindrical object with a smaller diameter than the cylindrical object is formed. Similar effective drying can be achieved by arranging the radiators inside the cylindrical object with concentric axes and overlapping lengths.

〔Effect of the invention〕

According to this invention, a cylindrical radiator that emits electromagnetic waves having a wavelength of 3 μm or more and 100 μm or less is used to dry an organic film applied to the surface of a cylindrical object, and a cylindrical object that has a diameter different from that of the cylindrical radiator. and a holding mechanism for holding the cylindrical radiator so that the radiator is concentric with the cylindrical radiator and overlaps in the length direction. By using such equipment, it is possible to dry an organic film applied to the surface of a cylindrical object with high accuracy, smoothness, and uniformity in a short time, and it is possible to form a homogeneous film with excellent surface properties. This is particularly suitable for functional organic films since it can reduce deterioration and variation in functionality.

Furthermore, the organic film drying device according to the present invention does not require rotating a cylindrical object or controlling complicated temperature conditions, has a simple mechanism, and has a small volume of high-temperature atmosphere, making it compact. is possible.

[Brief explanation of drawings]

FIG. 1 is a conceptual diagram of an embodiment of the organic film drying apparatus of the present invention.

Claims (1)

[Claims] 1) A cylindrical radiator that emits electromagnetic waves with a wavelength in the range of 3 μm or more and 100 μm or less, and a cylindrical object that has a diameter different from that of the cylindrical radiator, which are concentric with the cylindrical radiator and overlap in the length direction. and a holding mechanism for holding the cylindrical object held by the holding mechanism, the organic film coated on the surface facing the cylindrical radiator of the cylindrical object held by the holding mechanism is heated by the electromagnetic waves emitted from the cylindrical radiator. An organic membrane drying device characterized by drying.