JPH02140782A - Production of heat fixing roll - Google Patents

Abstract

PURPOSE:To obtain a smooth and long-life fluororesin coated rubber roll by grinding a heat resistant elastic body layer, which is formed on a metallic core bar and has 30 to 50 deg. rubber hardness, to a prescribed outside diameter and smoothing this layer by abrasive treatment with an abrasive having 3 to 60mum particle size and forming a fluororesin surface layer on this layer. CONSTITUTION:The heat resistant elastic body layer which is formed on the metallic core bar and has 30 to 50 deg. rubber hardness is ground to a prescribed outside diameter and is smoothed by abrasive treatment with the abrasive having 3 to 60mum particle size, and the fluororesin surface layer is formed on this layer. Since waving and ruggedness of the heat resistant elastic body surface of low hardness as the lower layer are eliminated by abrasive treatment and is smoothed before the fluororesin surface layer is formed after grinding of the heat resistant elastic body layer, the smooth fluororesin surface layer is easily provided on the elastic body layer, and the heat resistant elastic body layer and the fluororesin surface layer are closely brought into contact with each other. Thus, a heat fixing roll of high performance, high quality, and long life is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a method of manufacturing a heat fixing roller used in a heat fixing section of an electronic copying machine, for example.

(Prior Art) Conventionally, heat fixing rollers used in the heat fixing section of electronic copying machines and the like have been made using, for example, a metal core shaft made of aluminum or the like coated with fluororesin, or a metal core shaft coated with silicone rubber or the like. It is known that the outermost layer is coated with a fluororesin through a layer made of a heat-resistant elastic material such as fluororubber. Such rollers have good mold releasability, heat resistance,
Since the outermost layer is coated with a fluororesin that has excellent properties such as mechanical strength, it has a long lifespan.

Among these, the latter type of roller, which has a layer made of a heat-resistant elastic material on a metal core shaft and a fluororesin surface layer provided through this, has high image fixing efficiency (it also has good paper passing properties).
The former roller is widely used because it can provide higher quality images than the roller.

A method for manufacturing a roller with a multilayer structure in which a heat-resistant elastic layer and a fluororesin layer are provided on a metal core shaft is as follows: For example, a metal core shaft made of aluminum or the like is blasted, degreased, and washed, and then a brimer is applied. A heat-resistant elastic material such as silicone rubber is vulcanized and bonded through the resin, and then the heat-resistant elastic material layer is ground to a predetermined outer diameter. A method of coating with a fluororesin such as ethylene resin is known.

(Problem to be Solved by the Invention) However, in rollers manufactured by such a method, when low-hardness silicone rubber is used as the heat-resistant elastic material to improve image quality, the surface of the heat-resistant elastic material layer becomes smooth. The problem was that it was difficult to grind. This is because heat-resistant elastic materials with low hardness tend to cause waviness on their surfaces during grinding, and fillers such as quartz powder that are blended into silicone rubber tend to protrude onto the surface of the heat-resistant elastic material layer. This is thought to be due to.

When such large and small irregularities occur on the surface after grinding, there is a problem in that it is difficult to form a smooth fluororesin surface layer on the heat-resistant elastic body. Furthermore, even if a smooth fluororesin surface layer is obtained, the adhesion between the fluororesin surface layer and the heat-resistant elastic layer is insufficient, so the fluororesin surface layer may crack or float during use as a heat fixing roller. There was a problem of short life. FIG. 2 is an enlarged view showing the circumferential contour of the undulating ground surface of silicone rubber with a rubber hardness of 40°.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for manufacturing a fluororesin-coated rubber roller that eliminates these conventional drawbacks, provides high-quality images, and has a long life.

[Structure of the invention] (Means for solving the problem) That is, the present invention provides a rubber hardness of 30 to 50° on the metal core shaft.
A heat-resistant elastic layer is formed, and this heat-resistant elastic layer is ground to a predetermined outer diameter, and then smoothed by polishing using an abrasive with a grain size of 3 to 60 μm. It is characterized by forming a fluororesin surface layer on the surface.

In the present invention, an example of an abrasive material that can be used is a precision abrasive material (trade name: Wrapping Film, manufactured by Sumitomo 3M Ltd.) in which ultrafine particles of aluminum oxide, silicone carbide, and diamond are coated as abrasive particles on a polyester film. (manufactured by a company), etc. In addition, such abrasives have a particle size of 3 to 60 μm.
A thickness of 9 to 15 μm can be used, but more suitable results can be obtained if a thickness of 9 to 15 μm is used.

It goes without saying that the adhesion between the layers can be increased by applying a suitable brimer between each layer according to a conventional method.

(Function) In the heat-fixed tube roller of the present invention configured as described above, after grinding the heat-resistant elastic material layer and before forming the fluororesin surface layer, the surface of the heat-resistant elastic material with low hardness as the lower layer is subjected to polishing treatment. Since the surface is smoothed by removing undulations and irregularities, a smooth fluororesin surface layer is provided on the container, and the heat-resistant elastic layer and the fluororesin surface layer are firmly attached.

(Example) The present invention will be explained in detail below.

An aluminum core shaft having an outer diameter of 50 mm and a length of 33,011 mm was blasted, degreased, and washed according to a conventional method, and then silicone rubber with a rubber hardness of 40° was vulcanized and bonded via a brimer. This is then ground to a predetermined roller outer diameter using a cylindrical grinder, and then a precision abrasive material (product name: Wrapping Film, manufactured by Sumitomo 3M Co., Ltd.) is a polyester film coated with ultrafine particles of aluminum oxide, silicon carbide, and diamond as abrasive particles. The surface of the rubber layer was polished to make it smooth. At this time, the particle size of the abrasive is 9 μm (
2000 mesh) and the roller is 480r.
Polishing was performed by sliding an abrasive material onto the roller surface while rotating at pm. FIG. 1 is an enlarged view showing the circumferential contour of the surface of the rubber layer polished and smoothed in this manner.

After that, PTFE disversion (trade name: AD-839, manufactured by Asahi Glass Co., Ltd.) as a fluororesin was coated on the surface of the silicone rubber layer thus polished and baked in a conventional manner, resulting in a smooth surface. A multilayer silicone rubber roller having a fluororesin surface layer was obtained.

In addition, when the roller thus obtained was subjected to an actual machine paper passing test to examine its durability, it was found that the conventional roller manufactured in the same manner as the roller of the example except that no polishing treatment was performed was 85,000 yen. Although peeling of the fluororesin layer was observed with 334,000 sheets, it was able to withstand use up to 334,000 sheets.

In this example, a roller was manufactured using silicone rubber as the heat-resistant elastic body with low hardness and PTFE as the fluororesin, but the present invention is not limited thereto.

[Effects of the Invention] As explained above, according to the heat fixing roller of the present invention, since the fluororesin surface layer is formed in close contact with the heat-resistant elastic layer, even the surface of the heat-resistant elastic layer with low hardness can be coated. It becomes possible to form a smooth fluororesin surface layer, and a heat fixing roller with high performance, high quality, and long life can be manufactured.

[Brief explanation of the drawing]

FIG. 1 is an enlarged view showing the outline of the surface of a heat fixing roller using low hardness rubber manufactured according to an embodiment of the present invention;
FIG. 2 is an enlarged view showing the outline of the surface of a heat fixing roller using low hardness rubber manufactured by a conventional method. Figure 2

Claims (1)

[Claims] A heat-resistant elastic layer with a rubber hardness of 30 to 50 degrees is formed on the metal core shaft, and this heat-resistant elastic layer is ground to a predetermined outer diameter, and then smoothed by polishing with an abrasive with a particle size of 3 to 60 μm. 1. A method for manufacturing a heat fixing roller, the method comprising: forming a fluororesin surface layer on a heat-resistant elastic layer;