JP2002139912A - Manufacturing method of oa roller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a developing roller and the transferring roller of an excellent quality by preventing coated paint on a surface of a base body of the roller from liquid dropping, the film affixing or the like. SOLUTION: As for the manufacturing method of a developing roller incorporating the processing stage of forming a paint film on the surface of base body of the roller, by dipping the roller base body in the paint, the paint is applied in a state of maintaining the approximately constant temperature within the range of 25 deg.C to 35 deg.C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an OA roller used in an electrophotographic apparatus such as a copying machine, a facsimile, and a printer, that is, a developing roller and a transfer roller.

[0002]

2. Description of the Related Art In recent years, with the advance of electrophotographic technology, polymer elastic members have attracted attention in image forming apparatuses such as dry electrophotographic apparatuses as materials for OA rollers used for development and transfer. ing. In these OA rollers, it is important to perform coating with uniform performance in order to obtain uniform high image quality.

Conventionally, however, the temperature of the paint during storage has been sufficiently controlled, but the temperature of the paint during coating has not always been strictly controlled.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and includes a step of forming a coating film on the surface of a roller base by dipping the base of the roller into the coating. It is an object of the present invention to manufacture an OA roller capable of obtaining a high-quality image, that is, a developing roller and a transfer roller, by applying the composition at a constant temperature within a specific temperature range.

[0005]

Means for Solving the Problems The present inventors have conducted intensive and repetitive experiments in order to achieve the above object.
It was confirmed that when the coating material was maintained at a substantially constant temperature within a certain temperature range, a uniform dipping process could be performed, and a high-quality developing roller and transfer roller could be obtained. The present invention is based on such findings.

[0006]

DETAILED DESCRIPTION OF THE INVENTION That is, a method of manufacturing an OA roller, that is, a developing roller and a transfer roller according to the present invention, includes a step of forming a coating film by applying a coating material on the surface of a base of the roller. In the method for manufacturing a roller, the temperature of the paint is set to 25 ° C.
It is characterized in that it is applied in a state of being kept substantially constant within a range of up to 35 ° C.

In order to keep the paint at a constant temperature, it is general to install a heater or the like inside or outside the lower part or side of the dip bath and to control the temperature by a sensor or the like in a known manner. is there. A warm water circulation path may be formed on the outer wall or bottom wall of the tank, and warm water may be circulated through the circulation path to heat the paint.

A water-based paint is used as the paint applied to the surface of the substrate. This is because, in the case of an aqueous paint, when the OA roller is dipped, dripping of the paint due to slow drying becomes a problem, and the use of the method of the present invention is significant.
In the case of a paint having good drying properties such as an oil-based paint, such a problem does not occur much.

Further, if any of urethane-based, acrylic-based, and emulsion-based paints is used as the water-based paint, the effect of the method of the present invention is large.

In the method of manufacturing an OA roller according to the present invention, not only the temperature is kept in the range of 25 ° C. to 35 ° C. However, when the temperature of the paint changes extremely depending on the temperature of the paint, it is necessary to control the temperature of the paint so as to be kept within a range of ± 1 ° C. within the above temperature range. ,
It is difficult to prevent paint dripping, which may result in defective products.

The material of the substrate of the OA roller to be applied is
Solid rubber or urethane rubber is preferred for image formation.

When the OA roller of the present invention has conductivity, a conductive material is added to the foam material. The conductive material includes an ionic conductive material and an electronic conductive material.

Examples of the ion conductive material include octadecyltrimethylammonium such as dodecyltrimethylammonium such as tetraethylammonium, tetrabutylammonium and lauryltrimethylammonium, hexadecyltrimethylammonium and stearyltrimethylammonium, benzyltrimethylammonium, and modified aliphatic dimethylethylammonium. Ammonium perchlorate, chlorate, hydrochloride, bromate, iodate, etc.
Organic ion conductive materials such as borofluoride, sulfate, alkyl sulfate, carboxylate, sulfonate, etc., alkali metal or alkaline earth metal perchlorates such as lithium, sodium, calcium, magnesium, etc., chlorine Acid salt,
Hydrochloride, bromate, iodate, borofluoride,
Inorganic ion conductive materials such as trifluoromethyl sulfate and sulfonate can be used.

As the electronic conductive material, conductive carbon black such as Ketjen black and acetylene black;
SAF, ISAF, HAF, FEF, GPF, SRF,
Carbon black for rubbers such as FT and MT; carbon black for inks such as carbon oxide black; pyrolytic carbon black; graphite; conductive metal oxides such as tin oxide, titanium oxide and zinc oxide; metals such as nickel and copper;
Examples thereof include conductive whiskers such as carbon whiskers, graphite whiskers, titanium carbide whiskers, conductive potassium titanate whiskers, conductive barium titanate whiskers, conductive titanium oxide whiskers, and conductive zinc oxide whiskers.

When the foam material is polyurethane or the like,
In addition to the conductive material, fillers such as inorganic carbonates, foam stabilizers such as silicone foam stabilizers and various surfactants, antioxidants such as phenol and phenylamine, low friction agents, charge regulators and the like. It is good to add.

As the silicone foam stabilizer, a dimethylpolysiloxane-polyoxyalkylene copolymer or the like is suitably used. Particularly preferred. The molecular structure of the polyoxyalkylene moiety is preferably an ethylene oxide addition polymer or a co-addition polymer of ethylene oxide and propylene oxide, and it is also preferable that the molecular end of the polyoxyalkylene moiety be ethylene oxide.

Examples of the surfactant include cationic surfactants, anionic surfactants, ionic surfactants such as amphoteric surfactants, and nonionic surfactants such as various polyethers and various polyesters.

In order to manufacture an OA roller using a foam as a raw material, there are a mechanical floss method, a water blowing method, a foaming agent floss method and the like. In the present invention, it is preferable to use a mechanical floss method.

In order to manufacture a foamed roller by mecarcal floss, a shaft made of metal or the like is placed in advance, and a foamed material foamed by mechanical stirring is injected into a preheated cylindrical mold having an inner surface. Alternatively, the reaction material may be cured by injecting the foam raw material into a mold, mixing the inert gas, and adding mechanical stirring.

Here, the inert gas used in the mechanical floss method is, for example, in the case of a polyurethane reaction,
Any gas that is inert in the polyurethane reaction may be used,
In addition to inert gases in a narrow sense, such as helium, argon, xenon, radon, and krypton, gases that do not react with polyisocyanates, such as nitrogen, carbon dioxide, and dry air, may be mentioned.

The developing roller and the transfer roller according to the present invention are suitably used by being mounted on an image forming apparatus such as a plain paper copying machine, a plain paper facsimile machine, a laser beam printer, a color laser beam printer, and a toner jet printer. .

[Examples] Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples. Example 1 An acrylic paint as a water-based paint was dipped on a base of a developing roller made of solid rubber.

As described above, the temperature of the paint at the time of dipping is set to 23 ° C., 24
The temperature was kept within a range of ± 1 ° C. at each of five temperatures of 25 ° C., 25 ° C., 35 ° C., and 36 ° C., and it was measured whether there was no dripping of the paint or film peeling of the paint in the container. Further, the obtained developing roller was mounted on an electrophotographic image forming apparatus, and an image test was performed. The results are as shown in Table 1.

Example 2 An acrylic paint as a water-based paint was dipped on a base of a transfer roller made of solid rubber. The temperature of the paint at the time of dipping is 23 ° C., 24 ° C., 25 ° C., 35 ° C., 36 ° C.
At each temperature of ° C., the temperature was kept within a range of ± 1 ° C., and it was measured whether there was no dripping of the paint or film peeling of the paint in the container. Further, the obtained transfer roller was mounted on an electrophotographic image forming apparatus, and an image test was performed. The results are as shown in Table 2.

In each of the above Experiments 1 and 2,
When the temperature of the paint is 25 ° C. and 35 ° C., it is possible to manufacture an OA roller that is uniformly coated and a good image is obtained. When the temperature is 23 ° C., 24 ° C., and 36 ° C., the dripping of the paint,
Or a coating film was found.

[0026]

[Table 1]

[0027]

[Table 2]

The base of the developing roller and the transfer roller is suspended from a hanger as a set of 40 rolls, and the cycle is performed for 15 minutes, and the temperature is measured after a lapse of 6 hours from the start of the dipping process. When the change and the properties were measured, it was found that when the temperature variation was ± 2 ° C. or more, the rate of dripping was 30% or more, and when it was within ± 5 ° C., it could be suppressed to about 2%.

[0029]

According to the production method of the present invention, production defects such as dripping or paint film peeling can be prevented.
High quality development and transfer rollers can be obtained.
If the temperature variation is within ± 1 ° C., the occurrence rate of defective products can be suppressed to about 2%.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B05D 7/24 302 B05D 7/24 302P 302T G03G 15/16 G03G 15/16 // B05C 11/10 B05C 11 / 10 F term (reference) 2H032 AA05 BA19 2H077 AD06 FA22 4D075 AB54 BB93Y CA48 DA10 DA15 DB35 DB50 DC16 DC19 EA06 EB22 EB38 4F042 AA03 AA06 BA19

Claims (10)

[Claims] 1. A method of manufacturing a developing roller comprising a step of forming a coating film on the surface of a base of a roller by dipping a base of the roller into a coating, wherein the coating is formed at a temperature of 25 ° C. to 35 ° C. A method for manufacturing a developing roller, wherein the coating is performed at a substantially constant temperature. 2. The method according to claim 1, wherein the paint is a water-based paint. 3. The method according to claim 1, wherein the paint is a water-based paint selected from urethane, acrylic, and emulsion. 4. The method for manufacturing a developing roller according to claim 1, wherein the temperature of the paint is controlled within ± 1 ° C. 5. The method for manufacturing a developing roller according to claim 1, wherein the substrate is a solid rubber or urethane rubber. 6. A method for producing a transfer roller, comprising a step of forming a coating film on the surface of a substrate of a roller by dipping the substrate of the roller into a coating, wherein the coating is performed at a temperature in the range of 25 ° C. to 35 ° C. A method for producing a transfer roller, wherein the coating is performed while maintaining the temperature at a substantially constant temperature. 7. The method according to claim 6, wherein the paint is a water-based paint. 8. The method for producing a transfer roller according to claim 6, wherein the paint is a water-based paint selected from urethane, acrylic, and emulsion. 9. The method for producing a transfer roller according to claim 6, wherein the temperature of the paint is controlled within ± 1 ° C. 10. The method for producing a transfer roller according to claim 6, wherein the substrate is a solid rubber or urethane rubber.