JPH03284782A - Fixing roller - Google Patents

Abstract

PURPOSE:To obtain roller prevented from generating peeling or the like by providing fluorine group resin adhesive layer on the outside of a roller base, impregnating rubber into an outer porous part consisting of a prescribed outer porous body through the layer, curing the rubber, and then forming a fluorine series resin releasing layer on the outside of the rubber layer. CONSTITUTION:The fluorine series resin adhesive layer 11 is formed on the outside of the base 10 of a fixing roller to be used for a fixing device for fixing a toner image formed on copying paper through a pair of rollers. Heat resistance rubber is impregnated into the outer porous part obtained by laminating the outer porous body 12 consisting of ethylene tetrafluoride resin through the layer 11 and calcining the layer 12 and cured and then a fluorine series resin releasing layer 13 is formed on the outside of the rubber impregnated layer. Consequently, the roller prevented from generating offset and peeling during the feeding of paper and having strong resistance against mechanical shock can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a fixing roller, particularly an elastic fixing roller, used in a fixing section of a copying machine, a line printer facsimile, etc., for example.

``Prior Art'' This type of fixing roller (see Figure 2 below) has conventionally been made using a porous material made of tetrafluoroethylene resin on the outside of a core bar, as shown in Japanese Patent Application Laid-Open No. 60-179770. Some have a layer impregnated with heat-resistant rubber. Also, JP-A-1-1
As shown in No. 47576, there is a metal roller in which an elastic layer made of fluororubber or silicone rubber is coated on the outside with a fluororesin.

FIG. 2 is a diagram explaining the fixing rollers in a general copying machine, in which (1) is the heat fixing roller, (2) is the pressure fixing roller, (3) is the toner, and (4) is the heat fixing roller. is copy paper, (5
) is a heater, (6) is a blade, and (7) is a peeling claw.

``Problems to be Solved by the Invention'' However, since the surface of the fixing roller shown in Jikai No. 111860-179770 is a composite of fluororesin and silicone rubber, it is difficult to release the toner from the surface. It is inferior to a roller coated with fluororesin, especially during high-speed copying, when it comes into contact with toner formed on copy paper, the contact time with the toner is short due to the high speed, and the toner cannot be sufficiently heated and fused. occurs, and the toner may be removed from the paper (offset phenomenon), which is one of the causes of instability in terms of image performance.

Furthermore, there is no special adhesive treatment between the core metal and the composite of fluororesin and silicone rubber, so the adhesion is weak.
Peeling may occur during paper passing, and this was one of the causes of instability in terms of durability.

Furthermore, the fixing roller disclosed in Japanese Patent Application Laid-open No. 1-147576 has excellent releasability for toner due to the fluororesin coating, but the adhesion between the elastic layer and the fluororesin coating is weak during use. Peeling may occur at the bonded area. Furthermore, since the elastic layer is made of rubber, it is vulnerable to mechanical shocks, such as the scraping of paper peeling claws during paper passing, and in such cases, it can be damaged, which is a factor that makes it unstable in terms of durability. There was one.

In view of the above, the present invention was developed to solve these problems.

``Means for Solving the Problems'' That is, the present invention (see FIG. 1) provides a fixing roller used in a device that fixes a toner image formed on copy paper by passing it between a pair of rollers. A fluorine-based resin adhesive layer (11) is provided on the outside of 4.
After laminating and firing porous fluorinated ethylene resin, the porous portions are impregnated with heat-resistant rubber and cured ((12) indicates a porous body of tetrafluoroethylene resin impregnated with heat-resistant rubber and cured) , further outside thereof, a fluorine-based resin mold release layer (13)
This is a fixing roller characterized in that it is formed with:

Note that the embodiments of the present invention include at least the following.

(a) The fixing roller of the present invention, characterized in that a filler is blended in the fluororesin release layer.

(b) Fluorine-based resin The fluorine-based resin of the mold release layer is a tetrafluoroethylene resin (PTFE), a tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), a tetrafluoroethylene-hexafluoropropylene copolymer ( The above-mentioned fixing roller of the present invention is characterized in that it is FEP)-i or a mixture thereof.

(c) The fixing roller of the present invention, characterized in that silicone rubber, fluorine rubber, or the like is used as the heat-resistant rubber impregnated into the pores of a laminated and fired porous body of tetrafluoroethylene resin.

2) The MZ of the fluorine-based resin adhesive layer provided between two or more laminated layers of the porous body of tetrafluoroethylene resin or on the surface of the roller base material and the porous body of the tetrafluoroethylene resin? Cte) Powder of lafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA) or tetrafluoroethylene-hexafluorofluoropylene copolymer (FEP) is scattered or a network is interposed. The above fixing roller of the present invention.

(e) A porous body of 4-fluoride tyrene resin mixed with powder of tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA) or tetrafluoroethylene-hexafluoropropylene copolymer (FEP) The fixing roller of the present invention is characterized in that a porous body of ethylene oxide resin is used.

(F) The fixing roller of the present invention, characterized in that the layer closer to the roller base material of the porous body of tetrafluoroethylene resin is formed by laminating two or more layers and has a lower porosity than the layer farther away.

(g) The fixing roller of the present invention, wherein the fluorine-based resin layer provided on the outside of the roller base material has a two-layer structure.

(g) The fixing roller of the present invention, characterized in that the fluororesin release layer contains a filler having good film-forming properties or thermal conductivity.

The invention will be further explained in detail below.

The present invention solves the problems of the prior art described above by improving the adhesive strength of each component and providing sufficient strength against mechanical impact without impairing the releasability of toner. . In other words, in a fixing roller used in a device that fixes a toner image formed on copy paper by passing it between a pair of rollers, a fluorine-based resin adhesive layer is provided on the outside of the roller base material, and through this layer, the It is characterized in that a porous body of ethylene resin is laminated and fired, the porous parts are impregnated with heat-resistant rubber and cured, and then a fluorine-based resin mold release layer is formed on the outside thereof.

The formation of the porous layer of the tetrafluoroethylene resin is as follows:
There are no particular limitations on the winding of a sheet-like body or the insertion of a tube-like body.

In addition, PFA resin is added to the release layer of tetrafluoroethylene resin or fluorine-based resin of the porous material (peel strength between the porous material layers of tetrafluoroethylene resin or between the porous material of tetrafluoroethylene resin and the roller base material). and other fillers (for coloring, thermal conductivity, etc.), such as copper, silver, aluminum, graphite, carbon carbide, potassium titanate, titanium nitride, silicon nitride, titanium. A compound containing carbide, titanium oxide, etc. may also be used, and the present invention naturally includes these.

"Function" When a copy paper coated with toner is passed using a fixing roller such as the one according to the present invention, offset can be prevented. The reason for this is that the fluorine-based resin formed on the surface has good releasability, so toner does not adhere to the roller surface.

Further, when a copy paper coated with toner is passed using a fixing roller such as the one according to the present invention, peeling does not occur during paper passing, or the occurrence thereof can be slowed down. The reason for this is that the roller of the present invention has a fluorine-based resin layer provided on the outside of the roller base material, and a porous body of tetrafluoroethylene resin is laminated and fired through this layer. After being impregnated and cured, a fluorine-based resin mold release layer is further formed on the outside thereof, so that the porous body of the tetrafluoroethylene resin that constitutes the elastic body is free from other fluorine-based resins. This is because when the porous resin is heated to a temperature higher than the melting temperature of the fluororesin, the fluororesin in contact becomes entangled with the fibers of the porous body and melts together, exhibiting good adhesive strength.

Furthermore, when copy paper coated with toner is passed through using the fixing roller of the present invention, the copy paper becomes resistant to mechanical shock during paper passing. The reason for this is that a porous body of tetrafluoroethylene resin is laminated and fired on the outside of the roller base material, and heat-resistant rubber is impregnated into the pores and hardened. This is because the porous ethylene resin material serves as a reinforcing material for the elastic material.

In one embodiment of the present invention, the fluororesin adhesive layer provided on the outside of the roller base material, that is, between the roller base material (for example, aluminum) and the elastic layer, has a two-layer structure.
There is a table.

′! J 1 Table (Note)

The reason why PFA is used in the upper layer is PTF for the elastic layer.
E This is because it adheres well to the porous body.

The reason for this is that PFA has a low melt viscosity, so PTFE
It is thought that the fibers get entangled and welded together.

The reason for using PTFE with a compounding agent in the lower layer is that it adheres well to the aluminum of the roller base material. The reason for this is thought to be that the compounding agent adheres well to aluminum.

Further, the upper layer and the lower layer are strongly bonded to each other during the formation process because they are made of fluorine resin.

"Example" Examples of the present invention will be described below along with comparative examples.

Example: Primer (T
CW8808GY (manufactured by Daikin Industries) was painted and dried. In addition to this, PFA disversion (AD-2CR
1 manufactured by Daikin Industries, Ltd.), and then baked at 340°C.

PFA resin powder (Mitsui 70
An unfired porous sheet with a porosity of so% and a thickness of 60 μm manufactured by blending 10 parts by weight of 10 parts by weight of 100% of the material (manufactured by Rochemical Co., Ltd.), molding and stretching was applied to the above roller to a thickness of 0.5 m after firing. It was wrapped and fired.

This porous layer was impregnated with silicone rubber (KE109, manufactured by Shin-Etsu Chemical Co., Ltd.), cured, and then ground to a thickness of 150 μm using a cylindrical grinder.

The outer periphery of this roller was coated with PFA resin powder (manufactured by Mitsui 70 Rochemical Co., Ltd.) to a thickness of 30 μm after firing, and the roller surface was fired at a temperature of 650° C. for 3 minutes.

Thereafter, a desired roller was obtained by polishing the surface with a polishing film.

Comparative Example 1: 10 PTFE resin fine powder (F-104, manufactured by Daikin Industries) was applied to the outer periphery of an aluminum cored roller with an outer diameter of 6 Dvm.
An unfired porous sheet with a porosity of 80% and a thickness of 60 μm manufactured by blending 10 parts by weight of PFA resin powder (manufactured by Mitsui 70 Rochemical Co., Ltd.) with 0 parts by weight, forming and stretching the above. After baking, it was wrapped around a roller to a thickness of 0.5 wafer and baked.

This porous layer was impregnated with silicone rubber (KE109, manufactured by Shin-Etsu Chemical Co., Ltd.), cured, and then ground to a thickness of 150 μm''1 using a cylindrical grinder.

Comparative Example 2: The surface of an aluminum core metal with an outer diameter of 60W+ was roughened by sandblasting, a silicone rubber layer was formed on it, and the thickness was 150μ.
It was ground using a cylindrical grinder to a depth of m.

The outer periphery of this roller is coated with PFA resin powder (manufactured by Mitsui Fluorochemical Co., Ltd.) to a thickness of 30 μm after firing.
It was baked at ℃ for 3 minutes. Thereafter, a desired roller was obtained by polishing the surface with a polishing film.

The peel strength between the core metal and the elastic body of the rollers of the above Examples and Comparative Examples 1.2 and the peel strength between the coated fluorine-based resin release layer and the elastic body were measured, and these rollers were then attached to the fixing section of a copying machine. , a durability test by continuous paper passing, and a ballpoint pen test (a loaded ballpoint pen is brought into contact with the roller, then the roller is rotated with care and the load at which breakage begins on the roller surface is recorded). went. The result is the second
Shown in the table.

"Effects of the Invention" As described above, according to the present invention, offset does not occur, peeling does not occur during paper passing, or the occurrence can be slowed down, and a roller that is strong against mechanical shock is provided. Obtainable. Therefore, it is effective when used in a fixing section of a copying machine, printer, facsimile, etc.

Further, the fixing roller of the present invention can be widely used not only as a heat fixing roller but also as a pressure fixing roller, and as a roller that requires heat resistance and mold releasability.

[Brief explanation of the drawing]

FIG. 1 is a partial longitudinal sectional front view of the fixing roller of the present invention (Figure (a)
)) and a cross-sectional view (Figure (b)), FIG. 2 is a cross-sectional view illustrating a general fixing roller. (1)... Heat fixing roller, (2)... Pressure fixing roller, (10)... Roller base material, (11)... Fluorine resin adhesive layer, (12)... Heat resistant (13) Fluorine-based resin mold release layer.

Claims (2)

[Claims] (1) In a fixing roller used in a device that fixes a toner image formed on copy paper by passing it between a pair of rollers, a fluorine-based resin adhesive layer is provided on the outside of the roller base material, and a fluorine-based resin adhesive layer is provided on the outside of the roller base material. A fixing roller characterized in that a porous body of fluorinated ethylene resin is laminated and fired, the porous parts are impregnated with heat-resistant rubber and cured, and then a fluorine-based resin mold release layer is formed on the outside thereof. (2) The fixing roller according to claim (1), wherein a filler is blended in the fluororesin release layer.