JPH0680474B2 - Fixing roller and fixing device having the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The elastic rotating body of the present invention relates to a rotating body such as a roller or a belt for conveying general articles or paper.

The fixing device of the present invention is a fixing elastic rotating member (belt-like member) such as a heating roller, a pressure roller or a heating and pressure roller used in an image forming apparatus such as a copying machine, a printing machine, a facsimile machine, a printer, or a composite machine of these. Fixing device having a roller).

[Prior art]

Conventionally, in the field of general conveyance, there are many conditions required for the rotating body, and elasticity for ensuring the conveying ability, releasability for durability and dirt prevention, and especially the effect of preventing frictional electrification of the rotating body. Is. However, the rotating body satisfying such conditions is complicated and expensive.

These conditions are particularly important for those used in image forming apparatuses. For example, a roller having a core metal coated with tetrafluoroethylene resin is used as the heating roller in contact with the toner image, and a roller coated with a rubber layer is used as the pressure roller in pressure contact with the heating roller to increase the heating / pressing time of the toner image. Is common.

Recently, attempts to combine the elasticity of rubber and the surface property of resin are found in JP-A-58-2864, JP-A-58-5770 and JP-A-58-27175. These suggestions are
The former discloses a roller coated with a mixed coating of fluororubber and fluororesin on the surface of a metal roller, and the latter discloses a roller coated with a mixed coating of fluororubber and a fluororesin on the surface of a rubber roller. .

On the other hand, a rubber roller is simply formed and a resin layer is formed on the surface of the roller.
There is a roller disclosed in Japanese Patent Publication No. This roller has a heat-shrinkable tube (FE) with a diameter larger than that of the rubber roller, which is obtained by polishing the surface of the silicone rubber roller and then applying an adhesive.
P: Fluorinated ethylene / propylene), covered with heat shrinkage at 104.4 ° C, and then heated at 182.2 ° C for 1 hour. However, in this method, it is difficult to obtain a roller having a predetermined shape because the amount of heat shrinkage is not uniform, and the inner surface must be cleaned extremely well after the resin tube is formed in advance. Further, with the present technology, the thickness of the heat-shrinkable tube can be formed only to 50 μm or more, so that the elasticity of the lower rubber layer is offset, and a roller utilizing the elasticity cannot be obtained by this method. That is, the roller according to this publication is inferior in accuracy and is expensive due to the large number of manufacturing steps, and it is not possible to obtain an appropriate fixing effect.

Further, there is a roller disclosed in JP-A-57-89785 and a roller disclosed in JP-A-59-74578. However, since these rollers do not receive sufficient resin in the surface resin layer, Or, even if it receives this, the resin layer on the surface does not have heat resistance and abrasion resistance, so that the abrasion is severe and even a few thousand sheets cannot be passed, and it cannot be used as a fixing roller.

[Purpose of the present invention]

The present invention has an object to provide a commonly used elastic rotating body with an antistatic effect and to have excellent specificity in surface releasability and durability.

Another object of the present invention is to provide a fixing device having an offset preventing effect, which has an appropriate elasticity and can be made more excellent in fixing property, abrasion resistance, and durability than conventional ones by the elastic rotating body. .

[Summary of the Invention]

The present invention achieves the above-mentioned object, and is characterized by new constitutional requirements of the state of the resin layer, focusing on the relationship between the resin layer and the rubber layer of the fixing roller.

That is, the present invention provides a fixing roller in which a resin layer is formed by applying an unsintered resin on an elastic layer and sintering the same, and a fixing device having the fixing roller, wherein the resin layer is formed of an unsintered resin on the elastic layer. It is a resin layer of two or more layers formed by repeating the coating and baking step at least twice, and the layer inside the surface resin layer contains a filler of an inorganic or semiconductor substance, and the resin layer on the surface. Is characterized by not containing a filler.

In particular, the present invention exerts a special effect when the elastic layer is a rubber layer, particularly a silicone rubber layer, and the resin layer is a tetrafluoroethylene resin layer which is fired at 327 ° C. or higher.

The elastic rotating body of the present invention has a small amount of dirt and can be stably conveyed from 500,000 sheets to 1 million sheets or more during ordinary sheet or article conveyance. In particular, in the fixing process, it is possible to perform at least 100,000 sheets with ordinary fixing, while the conventional number of sheets is at most tens of thousands, and by making the thickness of the resin layer within the range of 5μ to 35μ, By setting the number of sheets to 200,000 or more, and further in the range of 15 μ to 20 μ, it is possible to obtain sufficient durability and fixing effect for heat fixing of 500,000 sheets.

Further features of the present invention will be clarified below by the description of the embodiments.

Example of the present invention

FIG. 1 is an explanatory view of an embodiment of a fixing device of the present invention having an elastic rotating body of the present invention.

In FIG. 1, reference numeral 1 is a fixing roller on the side in contact with an unfixed toner image, and 2 is a pressure roller that rotates in pressure contact with the fixing roller 1.
Both are examples of the fixing roller of the present invention. The specific configuration is as follows.

The fixing roller 1 has a relatively thin silicon rubber (in this example, 0.3 mm to 0.8 mm) on a cored bar 11 having good heat conduction such as aluminum.
(thickness within a range of mm) and an elastic layer 12 above it, which is thinner than the elastic layer 12 made of a fluororesin such as PFA (copolymer of perfluoroalkoxyethylene resin) or PTFE (tetrafluoroethylene resin). Resin layer, which has a thickness of 10 μm to 30 μm in the example)
Have as 13.

Similarly, the pressure roller 2 is placed on a cored bar 21 made of stainless steel, iron, etc.
The elastic layer 22 is thicker than the silicon rubber elastic layer 12 and is relatively thick (a predetermined thickness within the range of 4 mm to 10 mm in this example), and a fluorine resin such as PFA or PTFE is formed on the elastic layer 22 above the elastic layer 22. Thin resin layer (predetermined thickness within the range of 10μ to 30μ in this example)
With 23.

These rollers 1 and 2 are formed by the manufacturing method shown in FIG. 3 or a method conforming to its purpose.
Briefly, it includes the following steps.

A rubber layer vulcanized and molded on the core metal (heat conductivity 1.4 × 10 ^-4 ~
1.5 × 10 ^-3 ) to form a silicone rubber roller of the desired shape. A preferred shape is an inverted crown type in which the central portion has a slightly smaller diameter than both ends. The surface of this rubber roller is coated with unbaked fluororesin such as dispersion (a fluororesin powder dispersed in water with a surfactant), enamel or powdered fluororesin over the entire length of the rubber roller by spray coating, electrostatic coating or powder coating. Apply it to a uniform thickness by a method such as body painting. In the case of PTFE, for example, the dispersion is a liquid which forms a film-like resin film by being heated to a glass transition point of 327 ° C. or higher of the crystalline melting point of a fluororesin.

After applying the above-mentioned fluororesin, the fluororesin is baked by a baking method described later to form a fluororesin film having sufficient strength and an elastic rotating body made of silicon rubber having sufficient rubber elasticity.

After that, the same process of applying unbaked fluororesin and baking is repeated. At this time, glass, carbon black, or metal oxides such as titanium dioxide, zinc oxide, tin oxide, etc. are mixed in the first fluororesin.

Then, the outermost fluororesin layer is coated with pure fluororesin which is not filled with any of the above-mentioned mixtures.

The first-time filler-containing fluororesin layer needs to be baked to such an extent that a filler such as an inorganic or semiconductor material is not mixed into the pure surface layer, and the surface resin layer may be substantially pure. Good.

The silicone rubber roller coated with this fluorine resin is
Resin properties cannot be obtained unless the fluororesin is sufficiently fired, so it must be heated above the crystalline melting point (PTFE 327 ° C or higher, PFA 306 ° C or higher). However, silicone rubber itself has excellent rubber properties such as impact resilience and compression set, but when heated to 300 ° C or higher, and even 306 ° C or 327 ° C or higher, smoke or depolymerization occurs. These not only hinder the formation of a high-quality fluororesin layer, but also cause the silicone rubber itself to lose its rubber properties. Therefore, when the rubber layer is overheated, the roller does not have the function of the rubber layer and does not have the characteristics of the resin layer, so that the condition suitable for fixing is completely lost.

For these reasons, in the examples of the present invention, the silicon rubber itself is kept under heating at a low temperature (up to 300 ° C. or less) at which smoke or depolymerization does not occur, and the crystals are formed in the fluorine-heated coating layer. A firing method that gives a high temperature state above the melting point was adopted.

Specifically, a method of rapidly heating the unsintered fluororesin on the surface while rapidly cooling the rubber layer from the inside of the core bar, or the dielectric loss tangent of the liquid fluororesin (dispersion, enamel) itself is the dielectric of the rubber layer. In addition to the dielectric heating method (see FIG. 3) utilizing the fact that it is greater than the tangent, any method that is suitable for this purpose is suitable for the present invention.

Although a thermal gradient is substantially formed in the silicon rubber in this thickness direction by this method, about 260 ° C to 280 ° C,
A temperature above the crystal melting point (specifically, a firing temperature of 340 ° C. to 380 ° C. of 327 ° C. or higher in PTFE) is applied to the unsintered fluororesin for about 5 to 10 minutes. After this firing, the roller is quenched. Due to this rapid cooling, the calcined fluororesin surface layer showing resin characteristics with a crystallinity of 95% or less, a tensile strength of 50 Kg / cm ² or more and a contact angle of 100 ° or more with water on the silicon rubber roller in a state of strong adhesion to the rubber roller. Moreover, it is formed sufficiently thick.

Therefore, in the fixing roller 1 and the heating roller 2, the lower silicon rubber itself exhibits desired rubber characteristics almost the same as before the resin layer formation, and the surface fluororesin layer exhibits completely baked resin characteristics. The adhesion of the layer is strong.

The elastic rotating body manufactured in this way has the following features.

1. Since the lower fluororesin layer is filled with glass, carbon black or metal oxides such as titanium dioxide, zinc oxide, tin oxide, etc., the resistance can be reduced and at the same time the film strength of the fluororesin layer can be increased. You can

2. Since the above-mentioned filler is not mixed in the surface fluororesin layer, there is nothing that impairs the good releasability of the fluororesin.

In this way, it becomes possible to reduce the resistance on the order of 10 ⁷⁷ to 10 ^{8 to the} power of 10 ⁷ to 10 ⁸ as compared with the case of pure fluororesin which does not impair the releasability of the surface layer.

Further, the film strength of the fluororesin layer in contact with the elastic body is increased by the filler, so that a strong film is formed which can sufficiently withstand abrupt deformation at the nip portion or the edge of the paper.

Also, the thermal conductivity increases due to the inclusion of fillers (pure fluororesin 6.0 × 10 ^-4 cal / cm ・ sec ・ ° C. 8.
(0x10 ^-4 col / cm ・ sec ・ ° C up to about ℃) The heat transfer to the paper is improved and the fixability is also improved.

Specifically, the above-mentioned examples showed durability of 350,000 sheets or more, the offset generation rate could be reduced to less than half that of the conventional one, and the fixed image could be made excellent.

This effect is that the resin layer itself has undergone sufficient firing and has a low degree of crystallinity, and the rubber layer has sufficient rubber properties, and the rubber layer, the filler-containing resin layer and the pure resin layer are Are obtained because they are firmly bound by the resin baking and the binding property of the filler. In particular, good fixability is obtained by the elastic layer that gives the resin itself substantial elasticity.

Here, preferable conditions for more effectively carrying out the present invention are shown below.

・ Silicone rubber 12,22 has rubber hardness (JISA) …… 30 degrees to 80 degrees * Rebound resilience …… 65 to 85% 100% Tensile stress …… 10Kg / cm ² or more Elongation …… 150% or more Oxidation deterioration coefficient …… 2 or less ・ Fluorine resin 13,23 is the total resin film thickness …… 5 μm or more and 30 μm or less * Surface contact angle …… 100 degrees or more Each resin layer * Elongation …… 50% or more * Tensile strength …… 50 Kg / cm ² Above * Crystallinity: 95% or less-Silicone rubber and fluororesin without adhesive primer * Adhesion strength: 20 to 120g / 10mm width.

The resin layer may be three or more layers, but it is preferable to limit the total thickness of the resin layer to the extent that it exhibits substantial elasticity.

Incidentally, the * marks are based on the measuring method described later, and the meanings of these respective numerical values will be described later separately from the above-mentioned constitution.

First, * repulsion elastic modulus, * tensile stress, and * elongation of rubber are measured according to the measuring method according to JIS K6301.

Specifically, first the test piece is 5 mm (width) x 20 mm (length) x 3
A dumbbell-shaped vulcanized silicone rubber of mm (thickness) was coated with a fluororesin dispersion and heat-treated according to the embodiment of the present invention, and the silicone rubber alone was further prepared.

That is, the fluororesin coating layer is heated to a temperature higher than 327 ° C., while the silicon rubber is kept under heating at 300 ° C. or lower, so that the fluororesin coating (the resin coating The characteristics are the above-mentioned contact angle of 100 degrees or more, elongation of 50% or more, and tensile strength of Kg / cm ² or more). After that, the silicone rubber test piece after peeling off the fluororesin layer on the surface layer is subjected to JIS K630.
Tensile stress and elongation are measured by the measuring method described in 1.

About impact resilience, 12.7 ± 0.13mm (thickness) × 29.0mm
After making a silicone rubber test piece of (diameter), apply the same heat treatment as above, and then treat it as a rubber single body JIS JIS
Measure according to K6301.

Further, regarding the silicon rubber on the fixing roller produced based on the embodiment of the present invention, the silicon rubber having the baking coating of the fluororesin on the surface layer is 5 (width) × 20 (length) from the core metal.
After peeling with a size of 0.3 to 0.5 mm (thickness), the fluororesin is peeled off from the silicone rubber and the tensile stress and elongation are measured by the method described in JIS K6301.

At this time, it is desirable that the thickness of the silicone rubber be closer to a uniform value, but since it is difficult to prepare a sample, it is difficult to obtain a uniform value in practice, so the measured value is about 70 to 80 compared to the measured value using the test piece described above. Compare as indicating the value of%.

The impact resilience of 65 to 85% indicates the ability of the fixing roller to elastically follow the unevenness of the paper and the deformation due to the presence or absence of toner during a short fixing time, which causes the fixing roller to deform to the unevenness of the paper toner. However, the range in which heat and pressure can be effectively applied to the toner is specified.

In the experiment, it was found that a fixing roller having a fluorine resin layer of 5 to 30 .mu.m on the surface shows a good fixing property when the resilience of the lower silicone rubber is 65 to 85%.

Numerical values of tensile stress and elongation indicate the basic physical properties of rubber and are parameters that contribute to the durability and fixability of the fixing roller.

The above-mentioned fixing roller using silicon rubber having 100% tensile stress of 10 kg / cm ² and elongation of 150% exhibits durability of about 200,000 sheets, and also has a sufficient impact resilience and thus has good fixing property. Silicone rubber with 100% tensile stress of 20 kg / cm ² and elongation of 300% has a durability of 300,000 sheets or more and good fixing.

On the other hand, the one with 100% tensile stress of 7 kg / cm ² and the elongation of 200% had 150,000 sheets without paper jam on the way, but after that, the rubber was scraped by the nail after 10 degrees of paper jam. Similarly, 100
With a tensile stress of 15 kg / cm ² and an elongation of 80%, it had about 100,000 sheets without paper jam during the process, and was scraped 5 times afterwards. Further, all of these were rubbers in a state of deviating from the physical property values of the present application, and the impact resilience was measured to be a value of 40 to 60%, and the fixability was also poor.

Next, these measuring methods will be described.

First, the crystallinity of the resin is measured by an infrared absorption spectrum, but it may be measured by X-ray or specific gravity. The contact angle was measured using the drop method (Metal surface technology 17, No7 1966). In the actual measurement, even if the contact angle (value for water) is a forward contact angle of 118 ° and a backward contact angle of 91 °,
Either one or the average of them should be 100 ° or more.

Next, for the elongation rate and tensile strength of the resin, only the resin film was taken out from the roller after manufacture as a tanzaque-type sample with a width of 15 mm and a length of 100 mm.
It was measured by performing a tensile test in minutes. For example, if the tensile strength is 95 kg / cm ² and the elongation is 80%, the minimum value is 72 kg / c.
The maximum value is 180 Kg / cm ² , and the maximum value is 120% at m ² and 60%, respectively.

Regarding the peel strength of the resin, cuts are made with a cutter knife at intervals of 10 mm width in the circumferential direction of the roll, the partially peeled fluororesin layer is pulled by a tension meter, and the maximum value is taken as the peel strength.

As described above, the use of silicone rubber for the elastic layer is effective for heat fixing, but in the present invention, an elastic body such as fuso rubber can be applied. Similarly, for the resin layer, resins other than the above examples can be used depending on the purpose.

Referring back to FIG. 1, another configuration of the fixing device will be described.

Reference numeral 3 denotes a heater such as a halogen lamp for heating the fixing roller from the inside, and the surface temperature of the fixing roller is always the optimum temperature (specifically, the temperature at which the toner can be melted by the heater 3, the temperature detecting element 4 and the control means 31). 160 to 200 ℃)
Maintained at.

Reference numeral 5 denotes an offset prevention liquid application means that also serves as a cleaning means for applying an offset prevention liquid such as silicon oil to the surface of the fixing roller. The coating means 5 may be felt-like, but a web is used in this example. The web 51 containing the offset prevention liquid is brought into contact with the fixing roller 1 by the elastic pressing roller 52 such as silicon sponge, and a small amount of the offset prevention liquid is applied to the surface of the fixing roller 1. Further, the web 51 is gradually taken up from the supply roller 54 by the take-up roller 53, and the contact surface of the fixing roller 1 with the web can be sequentially recognized by the control means (not shown).

The recording paper P carrying the unfixed toner image T is fed to the entrance guide 6
The toner image T is permanently fixed on the recording paper P by passing between the roller pair 1 and 2 while being guided by the sheet.
The separation claw 41 that contacts the surface of the roller 1 is provided to separate the recording material from the surface 1 of the roller.

In the fixing rollers 1 and 2 thus formed, the lower fluororesin layer has a low resistance, so there is little charging, and the adhesion strength between the rubber layer and the fluororesin layer is high. Is also eliminated, and the number of durable sheets used has been improved by several levels. In particular, since the fluororesin is completely baked without thermally deteriorating the characteristics of the silicone rubber, it is possible to use silicone rubber that has sufficient impact resilience and little compression set, and has surface releasability and wear resistance. It is also highly durable and highly elastic.

A specific numerical example will be given.

As fixing roller 1, 25 μm PTFE on 0.5 mm silicon rubber
It has a resin layer, the outer diameter of the central part is 39.8 mm and both ends have an outer diameter of 39.8 mm.
A roller of mm + 100 μm (reverse crown amount of 100 μm) was used.

This roller was manufactured as shown below, and an aluminum cored bar with a central diameter of 38.75 mm and a reverse crown amount of 100 μ was prepared as a cored bar, and the surface was sandblasted to degrease / degrease.
After drying, wrap a silicone rubber sheet through the primer, press vulcanize at 150 ° C for 40 minutes, then
After secondary vulcanization at 00 ° C, the rubber was uniformly ground to a thickness of 0.5 mm.

Next, apply a fluororesin device version mixed with a filler such as glass to a thickness of 15 μm by spray coating, and after drying treatment, give a temperature of 260 ° C to 280 ° C to the rubber and give 350 ° C to the resin. It was baked for 10 minutes by dielectric heating combined with infrared external heating.

Then, a pure fluororesin display purgeon containing no filler was applied by spray coating to a thickness of 10 μm, and baked as described above.

As the pressure roller 2, a roller having an outer diameter of 39.9 mm in which a PFA resin layer of 20 μm is coated on 6 mm silicon rubber was used. The pressure roller was manufactured as shown below. The core metal has an outer diameter of 27.86m
Prepare an iron core of m, sandblast the surface, degrease and dry it, wrap a silicone rubber sheet through a primer, press vulcanize at 170 ° C for 30 minutes, then at 200 ° C for 1 minute. After secondary vulcanization for a time, it was ground to a rubber thickness of 6 mm. Further, a liquid form of PFA resin powder was applied to the rubber roller to a thickness of 20 μm, the same drying treatment as that of the fixing roller was performed, and then baking was performed for 10 minutes to manufacture a pressure roller having an outer diameter of 39.9 mm.

Using these rollers 1 and 2, the surface temperature of the fixing roller is increased to 170
When fixing the toner while controlling the temperature at ℃, the toner shows exceptional fixability, and the generation of offset toner is 1/5 or less compared to the best toner in the past, and the replacement period of the cleaning member is more than doubled. You can prolong your life. Further, according to the above, the image quality is good and the image is hardly crushed, and the stable fixing property is exhibited even when the number of durable sheets exceeds 200,000 and the number of sheets fixed at 300,000.

In the above structure, the important structure is as shown in FIG.
The thickness t ₁ of the elastic layer 12 of the fixing roller, the resin layer 13 of the fixing roller
The thickness t _{2 of} the pressure roller, the thickness t ₃ of the elastic layer 22 of the pressure roller, and the thickness t ₄ of the resin layer 23 of the pressure roller have the following relationship.

That is, the roller 1 is t ₁ > t _{2 The} roller 2 is t ₃ > t ₄ , and preferably t ₄ <t ₂ <t ₁ <t _{3 With} this configuration, basically, the fixing roller and the pressure roller are Due to the additive effect, mutual defects are compensated for and mutual advantages are improved, resulting in excellent image quality and fixability, and excellent durability.

In this embodiment, the pressure roller is formed by applying the fluororesin once, but as a matter of course, like the fixing roller, multiple coating of the fluororesin with the filler and the pure fluororesin without the filler is applied. It is more preferable to form the pressure roller with.

FIG. 3 shows a firing method of the fixing roller of the present invention. The device shown in the figure is a specific example of a heating system that uses both an induction heating device and infrared external heating. The magnetron 105 and the high frequency (950MHz to 2450MHz) generated by the magnetron 105 are used.
A resin container 102 that can be opened and closed, and has a waveguide 106 for transmitting a wave and a metallic high-frequency reflection plate 103 on the inner surface connected to the waveguide.
And two infrared lamps for upper and lower infrared heating.
1 and has a reflective shade.

In the resin container 102, a fan 100 for generating an air flow in the hollow of the fixing roller 1 as a fixing roller and a fan 101 for generating an air flow in the container 102 are respectively driven by driving means outside the container. It is rotatably provided by. This container can be opened and closed around the fulcrum 108 and the handle 109 at the top.
Is the arm that positions the flange 1A of the roller 1 on the bottom
107 are fixed respectively.

110 is a control means of the device, which is a drive means 104 and a magnetron 10
5 and the infrared lamp 111 are operated by a variable timer (not shown) for a predetermined time by inputting a closed state of the container and a predetermined start signal.

Since the fixing roller 1 has a silicon rubber layer as a lower layer and a fluororesin device version on the surface in a dried state to some extent, a large amount of high frequency dielectric constant is absorbed in the device version as compared with the silicon rubber layer. Therefore, the fluororesin dispersion is rapidly heated to 340 ° C. to 350 ° C. by high frequency, infrared rays and heating in a constant temperature bath. At this time, since the silicone rubber layer has a low high frequency absorption rate, it is heated to a temperature of about 280 ° C. or lower rather than being heated to a higher temperature than the device version. This makes it possible to obtain the roller characteristics described above.

In the above examples, the fluorine resin dispersion is, for example, tetrafluoroethylene resin dispersion D-1 manufactured by Daikin.
Is.

In addition to the above-described embodiment, the present invention includes, as the fixing roller, another belt-shaped roller (for example, an intermediate belt for simultaneous transfer and fixing), a cleaning roller, and a release agent supplying roller. Since it has the releasability and elasticity of the resin, it has transferability and cleaning property (however, the cleaning roller performs cleaning in the order of surface energy, etc.) Prevents uniform coating and transfer unevenness, and exerts the advantages of excellent wear resistance in each application.

Further, FIG. 1 shows an example of a heat fixing device, which is preferable as an embodiment of the present invention. A pressure fixing device for pressure fixing a toner image with a light pressure, a pressure for simultaneous transfer fixing, etc. The present invention can be applied to a fixing device or a heat fixing device.

Further, the above-mentioned example has a two-roller structure, but includes a heating roller, a pressure roller, a release agent supply roller of a fixing device having three or more rollers, or a cleaning roller and other belt-shaped rollers. The device is also included in this device.

The present invention includes the rubber layer thickness and the resin thickness of the above-mentioned embodiment, wherein the former is set to a predetermined thickness within a range of 0.1 mm to 1 mm and the latter is set to a predetermined thickness within a range of 1 μ to 50 μ. The above-mentioned thickness is represented by the average thickness of each layer, and it is optimal that it is the minimum thickness.

Although the above embodiment does not provide an adhesive layer between the fluororesin layer and the silicone rubber layer, the present invention also includes an adhesive layer provided.

[Effect of the present invention]

The elastic rotating body (including a belt and a roller) of the present invention has an antistatic effect, is excellent in wear resistance and surface releasability, and fully exhibits the surface characteristics of the resin layer and the elastic characteristics of the elastic layer to obtain an article. Transport can be made more reliable. Further, since the lower layer has the fluororesin layer mixed with the above-mentioned filler, the life is extremely long, and the resistance of the fixing rotary member can be lowered without mixing the additive which is far from the outermost layer into the resin. Therefore, the offset prevention effect is improved.

When the fixing roller of the present invention is applied to the one roller (including the belt) that presses the recording material, the fixing roller prevents curling of the recording material and provides a clear fixed image and good fixability. The effect can be maintained for a longer period of time than before.

The surface of the elastic rotary member fixing roller of the present invention is considerably smooth, and the necessity of polishing can be reduced.

[Brief description of drawings]

FIG. 1 shows an elastic rotating body (including a belt and a roller) of the present invention.
And an explanatory view of an embodiment of a fixing device having the same, FIG. 2 is a partially enlarged view of a fixing roller, and FIG. 3 is an explanatory view of an embodiment of a manufacturing method of the fixing roller. 1 is a fixing roller, 2 is a pressure roller, 12 and 22 are elastic layers of silicone rubber, and 13 and 23 are fluororesin layers.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Isamu Sakane 5-13-13 Ichiriyama, Otsu City, Shiga Pref. S. Tay (56) Reference JP-A-57-89785 (JP, A) JP-A-53-77534 (JP, A)

Claims (4)

[Claims] 1. A fixing roller having a resin layer formed by applying an unfired resin on an elastic layer and firing the resin, wherein the resin layer has at least a step of applying an unfired resin on the elastic layer. It is a resin layer of two or more layers formed by repeating two or more times, the layer inside the surface resin layer contains a filler of an inorganic or semiconductor substance, and the resin layer on the surface contains a filler. A fixing roller which is not included. 2. The fixing roller according to claim 1, wherein the filler is glass, carbon black or metal oxide. 3. A fixing device having a fixing roller having a resin layer formed by applying an unfired resin on an elastic layer and firing the resin, wherein the resin layer is formed by applying an unfired resin on the elastic layer. It is a resin layer of two or more layers formed by repeating the firing step at least twice, and the inner layer of the resin layer on the surface contains a filler of an inorganic or semiconductor substance, and the resin layer on the surface is Is a fixing device characterized by not containing a filler. 4. The fixing device according to claim 3, wherein the filler is glass, carbon black, or a metal oxide.