JP2000192944A - Elastic roller, heat fixing device having the same, and method of manufacturing elastic roller - Google Patents

Abstract

(57) [Summary] (with correction) [PROBLEMS] To provide an elastic roller free from surface scratches and dirt, a method for manufacturing the same, and a scratch and dirt on the pressure roller surface in the initial stage using the same to improve toner adhesion. Provided is a heat fixing device that reduces dirt. SOLUTION: In an elastic roller having an elastic layer 22 outside a support 21 and a release layer 23 outside the elastic layer, lubricating particles are applied to the surface of the releasing layer, and the particle size of the lubricating particles is reduced. Is 1 to 10 μm, and lubricating resin particles such as silicane particles are suitable. The elastic roller passes the unfixed toner image on the recording material by passing the recording material on which the unfixed toner image is formed between the fixing member 10 and the pressing member 20 through a nip maintained at a predetermined temperature. It is used as a pressure member of a heat fixing device for fixing a permanent image.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus employing an elastic roller and an image forming process such as an electrophotographic system or an electrostatic recording system. The present invention relates to a heat fixing device that performs a heat fixing process by using an unfixed toner image of target image information formed and carried on a photosensitive paper or an electrostatic recording paper by a transfer method or a direct method as a fixed image.

[0002]

2. Description of the Related Art Conventionally, in a fixing device provided in an image forming apparatus employing an electrophotographic system, an electrostatic recording system or the like, a fixing roller which rotates by pressing a recording material carrying an unfixed toner image against each other. A so-called heat fixing device for fixing a recording material as a permanent image by passing through a nip formed by a pressure roller and a pressure roller is widely used. FIG. 3 shows an example of a conventional heat fixing device. In FIG. 3, reference numeral 40 denotes a fixing roller provided with a heating means, in which a halogen lamp 41 is disposed inside an aluminum hollow core 42, and the hollow core 4 is energized by a power source (not shown).
2. Heating sufficient to melt the toner on the recording material from inside 2 is performed. Further, in order to fix the toner on the recording material without offsetting the recording material, polytetrafluoroethylene (PTFE) and perfluoroalkoxytetrafluorofluoroethylene (PTFE) exhibiting excellent releasability are provided outside the hollow cored bar 42. A release layer 43 such as an ethylene copolymer (PFA) is formed. The release layer 43 is formed in a tube shape, or is formed by electrostatic spraying, dipping coating, or the like. In some cases, a conductive member such as carbon black is mixed into the releasable layer in order to prevent offset caused by charging up of the fixing roller surface due to conveyance of the recording material. Further, the hollow core metal 42 of the fixing roller 40 is electrically connected to ground,
Charge-up on the surface of the fixing roller is prevented. The thermistor 44 is in contact with the surface of the fixing roller 40, detects the temperature of the fixing roller surface, and turns on / off the power supply to the halogen lamp so as to heat the toner image on the recording material at an appropriate temperature. Control.

On the other hand, a pressing roller 50 presses the fixing roller 40 at both ends in the longitudinal direction of the roller with a pressing spring (not shown) to pinch and convey the recording material. Pressure roller 5
Reference numeral 0 denotes an elastic layer formed of silicone rubber or a sponge elastic layer 5 formed by foaming silicone rubber on the outside of the cored bar 51.
2. Further, a release layer 53 such as PTFE or PFA or FEP similar to the fixing roller is formed in a tube shape on the outer layer.
Alternatively, it is formed by coating. Therefore, a sufficient nip width can be formed between the two rollers by the elasticity of the pressure roller 50. The toner image on the recording material P nipped and conveyed in the nip portion can be fixed by heating from the fixing roller.

In addition, a method of minimizing power consumption without supplying power to the heat fixing device during standby, specifically, a toner image on a recording material via a thin film between a heater and a pressure roller. Examples of the heat fixing method using a film heating method for fixing the toner are disclosed in JP-A-63-313182, JP-A-2-157788, and JP-A-4-440.
No. 75, Japanese Patent Application Laid-Open No. 4-204980, and the like. FIG. 4 shows a schematic configuration of an example of the film heating system. That is, in FIG. 4, a heating member (heater, hereinafter referred to as a heater) 61 fixedly supported by a stay holder (support) 62 and a heat-resistant thin film (hereinafter, referred to as a fixing film) 63 are provided on the heater 61. A resilient pressure roller 50 is formed by pressing a non-illustrated pressing means (not shown) to form a nip portion (fixing nip portion) having a predetermined nip width and press-contact the nip portion. The heater 61 is heated and adjusted to a predetermined temperature by energization. The fixing film 63 is conveyed and moved in the direction of the arrow while being in close contact with and sliding on the surface of the heater 61 in the fixing nip portion by a driving unit (not shown) or the rotational force of the pressing roller 50. It is a roll-shaped ended web-shaped member.

In a state where the heater 61 is heated and controlled to a predetermined temperature and the fixing film 63 is conveyed and moved in the direction of the arrow, the material to be heated is located between the fixing film 63 in the fixing nip portion and the pressure roller 50. When a recording material on which an unfixed toner image is formed and carried is introduced, the recording material is brought into close contact with the surface of the fixing film 63, and is conveyed by nipping the fixing nip together with the fixing film 63. In the fixing nip portion, the recording material / toner image is heated by the heater 61 via the fixing film 63, and the toner image on the recording material is heat-fixed. The recording material portion that has passed through the fixing nip is separated from the surface of the fixing film 63 and conveyed.

Generally, a ceramic heater is used as the heater 61 as a heating member. For example, a silver palladium (Ag / Ag / Ag / Ag) layer is formed on the surface of the ceramic substrate (the surface facing the fixing film 63) having electrical insulation, good thermal conductivity, and low heat capacity such as alumina along the substrate length (the direction perpendicular to the drawing). P
d) A heat-generating resistor layer such as Ta2N is formed by screen printing or the like, and the surface on which the heat-generating resistor layer is formed is covered with a thin glass protective layer. In the ceramic heater 61, when current is applied to the energized heating resistor layer, the energized heating resistor layer generates heat, and the entire heater including the ceramic substrate / glass protection layer rapidly rises in temperature. This heater 61
Is detected by the temperature detecting means 64 provided on the back surface of the heater, and is fed back to the power supply control unit (not shown). The power supply control unit controls power supply to the power supply heating layer so that the heater temperature detected by the temperature detection unit 64 is maintained at a predetermined substantially constant temperature (fixing temperature). That is, the heater 61 is heated and adjusted to a predetermined fixing temperature. The stay holder 62 is formed of, for example, a heat-resistant plastic member and holds the heater 61 and also serves as a conveyance guide for the fixing film 63. Therefore, in order to enhance the slidability with the fixing film 63, grease or the like having high heat resistance is interposed between the fixing film 63 and the outer peripheral surfaces of the heater 61 and the stay holder 62. The pressing member 50 has the same configuration as the above-described pressing roller.

[0007]

However, in the case of the above-mentioned heat fixing device, the toner which is not fixed on the recording material adheres to the surface of the release layer on the surface layer of the pressure roller. There is a problem that the back surface of the recording material is stained.

It is considered that the toner adheres to the surface of the pressure roller for the following reasons. For example, when the transfer charge on the recording material leaks to the conductive primer layer or the conductive hollow core of the fixing film, the toner image on the recording material becomes difficult to be electrostatically held on the recording material, An offset phenomenon occurs in which toner adheres to the fixing film. Then, it is considered that before the subsequent recording material is conveyed, the surface of the fixing film to which the toner adheres comes into contact with the pressure roller, and at that time, the surface moves to the pressure roller side. However, the surface of the pressure roller is originally a member for improving the releasability so that toner does not adhere to the surface of the pressure roller by such a process. However,
There are countless scratches on the surface, and these scratches may cause toner adhesion. In fact, when the toner adhesion stain is compared between the pressure roller having many scratches and the roller having relatively few scratches, the roller having less damage is less likely to attach toner stain. In addition, comparing the roller whose surface has been cleaned with alcohol and the roller whose surface has not been cleaned, toner that has been cleaned is less likely to adhere to the roller. Considering these facts, it is considered that scratches and stains on the surface cause toner adhesion. On the other hand, scratches and stains on the surface are often caused by the manufacturing process under pressure. For example, in the case of a wound,
A mold used for molding silicone rubber or fluorine rubber, which is an elastic layer member of the pressure roller, is scratched by friction of the molding material. In particular, when the use frequency of the mold is high, it is easily expected that the number of scratches is larger than that of the pressure roller manufactured from a new mold. Further, before and after the vulcanization step for the purpose of curing the elastic layer member, there is a step of cleaning the surface of the releasable layer with alcohols in order to remove stains such as oils and fats. Here, when the cloth or web fibers used for cleaning are hard, they cause scratches on the surface. Further, at the stage of simply assembling the heat fixing device, there is a possibility that a worker may come into contact with the pressure roller to cause a flaw. Furthermore, as for the surface dirt, dirt such as oil and fine metal particles adheres to the surface of the elastic layer during the molding of the elastic layer as in the case of the scratches. Also, in the cleaning process before and after vulcanization, if there is dirt on the roller surface that cannot be removed with alcohol, there is a risk that the dirt spreads on the surface. In addition to these, it is considered that there are various accidental external causes as a cause of the generation of scratches and dirt.
However, considering the mass productivity of the pressure roller, it is impossible to eliminate scratches and stains as in the current situation. Therefore, in order to prevent toner adhesion, new means for controlling the action of scratches and stains is required.

[0009] On the other hand, this problem is particularly noticeable in the early stage of product use. As the use progresses, the transport amount of the recording material into the fixing device increases. As a result, even if there is toner adhering to the pressure roller, since the release layer itself is more releasable than the recording material, the effect of removing the toner to the extent that the recording material does not stain the back surface occurs. Conceivable. It is also conceivable that the recording material polishes the surface of the release layer, so that dirt and scratches disappear and toner adhesion is suppressed. However, in view of improving the quality of products, it is clear that it is desirable to avoid this problem even if it is a phenomenon that is limited only at the beginning.

Accordingly, a first object of the present invention is to provide an elastic roller free from surface scratches and dirt.

Another object of the present invention is to use such an elastic roller to improve the scratches and dirt on the surface of the pressure roller in the initial stage and to reduce dirt due to toner adhesion.

[0012]

Means for Solving the Problems In order to solve the above problems, the invention according to the present application is characterized by the following.

According to the present invention, there is provided an elastic roller having an elastic layer outside a support and a release layer outside the elastic layer, wherein lubricating particles are applied to the surface of the release layer. It is.

Further, the present invention provides a recording medium on which an unfixed toner image has been formed, which is passed between a fixing member and a pressing member through a nip maintained at a predetermined temperature. In an overheat fixing device for fixing the image as a permanent image on a recording material, wherein the elastic roller is used as a pressing member.

The present invention also provides an elastic layer on the outside of the support,
Further, after forming a release layer on the outer side, the surface of the release layer is coated with the lubricating particles by applying a dispersion of the lubricating particles on the surface and drying the coating. Is the way.

In the elastic roller of the present invention, lubricating particles are applied to the surface of the release layer. By this coating, dirt on the surface of the release layer is polished with the lubricating particles, and as a result, the surface is cleaned. Further, the scratch on the surface of the release layer is filled with the lubricating particles, and the surface is smoothed. Further, since the surface of the release layer is coated with the lubricating particles, there is an effect of further improving the release property of the surface.

According to the above-described effects, when the elastic roller is used as the pressing member, it is possible to reduce scratches and dirt on the surface of the release layer, which causes toner to adhere to the surface of the pressing member. It is possible to prevent contamination due to toner adhesion.

As the lubricating particles, lubricating resin particles such as silicone particles, benzoguanamine resin particles, melamine resin particles, fluorine resin fine particles, and acrylic resin fine particles are preferable. In particular, silicone particles are preferred in terms of thermal stability.

The particle size of the lubricating particles is preferably in the range of 1 to 10 μm. The particle size is determined by using a liquid in which lubricating particles are ultrasonically dispersed in water using a nonionic surfactant as a sample liquid and measuring the particle size using a measuring device (trade name, CAPA-500, manufactured by HORIBA, Ltd.). The distribution is measured and is the peak value of this distribution.

The elastic roller according to the present invention is effective as a pressure roller of the conventional heat fixing device shown in FIGS.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) An embodiment according to the present invention will be described below. FIG. 1 is a block diagram of an image forming apparatus according to the present invention.

In FIG. 1, reference numeral 1 denotes a photosensitive drum;
A photosensitive material such as PC, amorphous Se, and amorphous Si is formed on a cylindrical substrate made of aluminum, nickel, or the like. The photosensitive drum 1 is driven to rotate in the direction of the arrow, and its surface is first uniformly charged by a charging roller 2 as a charging device. Next, according to the image information,
Scanning exposure is performed by the laser beam 3 controlled to be N / OFF, and an electrostatic latent image is formed. This electrostatic latent image is developed and visualized by the developing device 4. As a development method, a jumping development method, a two-component development method, an FEED development method, or the like is used, and a combination of image exposure and reversal development is often used.

The visualized toner image is transferred from the photosensitive drum 1 onto the recording material P conveyed at a predetermined timing by a transfer roller 5 as a transfer device. Here, the sensor 8 detects the leading end of the recording material so that the image forming position of the toner image on the photosensitive drum 1 matches the writing start position of the leading end of the recording material, and the timing is adjusted. The recording material P conveyed at a predetermined timing is nipped and conveyed between the photosensitive drum 1 and the transfer roller 5 with a constant pressing force. The recording material P to which the toner image has been transferred is conveyed to the fixing device 6 and fixed as a permanent image. On the other hand, the transfer residual toner remaining on the photosensitive drum 1 is removed from the surface of the photosensitive drum 1 by the cleaning device 7.

FIG. 2 shows the configuration of the heat fixing device 6 according to the present invention. Although the present embodiment has been described with reference to a heat fixing device using a fixing film, a heat fixing device using a fixing roller may be used. In FIG. 2, the fixing member 1
0 is composed of the following members. Reference numeral 13 denotes a fixing film having a small heat capacity, which has a total thickness of 100 μm or less and has heat resistance and thermoplasticity, such as polyimide, polyamideimide, PEEK, and PE, in order to enable quick start.
It is a film based on S, PPS, PFA, PTFE, FEP, or the like. In addition, a film having sufficient strength and excellent durability for forming a long-life heat fixing device needs to have a total thickness of 20 μm or more. Therefore, the total thickness of the fixing film 13 is 20 μm or more and 100 μm or more.
m or less is optimal. Further, in order to prevent offset and secure the separation property of the recording material, PFA, PTFE, F
A heat-resistant resin having good mold release properties such as EP and silicone resin is mixed or coated alone.

Reference numeral 11 denotes a heating heater provided inside the fixing film 13, which heats a nip portion for melting and fixing the toner image on the recording material. The heating heater 11 has a thickness of about 10 μm on a surface of a highly insulating ceramic substrate such as alumina along a longitudinal direction by applying a current-generating resistance layer such as Ag / Pd (silver palladium), RuO2, or Ta2N by screen printing or the like. , Width 1-5
It is a current-carrying heating member formed by applying a linear or narrow band of about mm. A temperature detecting element 14, such as a thermistor, for detecting the temperature of the ceramic substrate that has been heated in accordance with the heat generated by the energized heat generating resistance layer is provided on the rear surface of the ceramic substrate. According to the signal of the temperature detecting element 14,
By appropriately controlling the duty ratio and wave number of the voltage applied to the current-carrying resistance layer from the electrode section (not shown) at the longitudinal end, the temperature control temperature in the fixing nip is maintained substantially constant, and recording is performed. Heating necessary for fixing the toner image on the material is performed. DC from the temperature detecting element 14 to a temperature control unit (not shown)
Energization is achieved by a connector (not shown) via a DC power supply unit and a DC electrode unit (not shown). In addition, a protective layer such as a thin glass coat or the like that can withstand rubbing with the fixing film is provided on the surface of the current-carrying resistance layer of the heater 11.

Reference numeral 12 denotes a heat-insulating stay holder for holding the heater 11 and preventing heat radiation in the direction opposite to the nip, and includes a liquid crystal polymer, a phenol resin, PPS, and PEE.
The fixing film 13 is loosely fitted around the fixing film 13 with a margin, and is rotatably arranged in the direction of the arrow. Further, since the fixing film 13 rotates while sliding on the internal heater 11 and the heat insulating stay holder 12, it is necessary to reduce the frictional resistance between the heater 11 and the heat insulating stay holder 12 and the fixing film 13. . Therefore, a small amount of lubricant such as heat-resistant grease is interposed between the surfaces of the heater 11 and the heat insulating stay holder 12. Thus, the fixing film 13 can rotate smoothly.

Next, the pressing member 20 according to the present invention comprises an elastic layer 22 formed by firing a heat-resistant rubber such as silicone rubber or fluorine rubber or silicone rubber on the outside of a metal core 21 as a support, On top of this, PFA, PTFE,
Release stratification 23 made of fluororesin such as FEP
There is. Specific specifications applied in this embodiment will be described later. The pressing member 20 is sufficiently pressed in the direction of the fixing member 10 by pressing means (not shown) from both ends in the longitudinal direction to form nip portions necessary for heat fixing.
It is rotationally driven in the direction of the arrow by a rotational drive (not shown) from the longitudinal end through the metal core 21. As a result, the fixing film 13 is driven and rotated on the outside of the stay holder 12 in the direction of the arrow in the figure. Alternatively, a driving roller (not shown) is provided inside the fixing film 13 and the driving roller is rotated to rotate the fixing film 13. The above is the configuration of the heat fixing device. The recording material P is appropriately supplied by a supply unit (not shown), and a heat-resistant fixing entrance guide 1 is provided.
5, the sheet is conveyed into a fixing nip formed by the heating member 10 and the pressing member 20. Thereafter, the recording material P discharged from the fixing nip is guided by a heat-resistant fixing discharge guide 16, nipped and conveyed by a discharge roller 17 and a discharge roller 18, and discharged onto a discharge tray (not shown).

The pressure roller used in this embodiment is:
A core metal covered with a PFA tube is placed in a cylindrical mold, silicone rubber is injected between the core metal and the PFA tube, and is formed by heat molding. A 50 μm thick PFA tube is used. The rubber thickness is 4 mm and the outer diameter of the pressure roller is 25 mm. Silicone resin particles Tospearl (trade name, manufactured by Toshiba Silicone Co., Ltd.) was applied to the pressure roller according to the following procedure to perform coating.

First, spherical silicone resin particles having a particle size of 1 to 10 μm are scattered on a tray or the like in which the entire pressure roller is accommodated. Next, the core metal 21 is pressed against the pressure roller particles.
Is applied to apply particles to the surface of the PFA release layer. At this time, care should be taken that the roller surface is brought into contact with the tray member so as not to be damaged.
Simply applying as described above only causes excess particles to adhere to the PFA surface. If an image is fixed by being provided in the above-mentioned heat fixing device as it is, a fixing defect occurs because the toner adheres to the back surface of the recording material or an appropriate nip is not formed between the fixing film and the recording material. Therefore,
It is necessary to wipe off the excess particles using a cloth or paper. However, if the material of the cloth or paper used is hard, the surface of the pressure roller may be further damaged. For example, when using Sirpon paper, a lot of scratches were made in the direction in which the paper was moved. In this embodiment, a felt cloth is used as a member that is unlikely to damage the surface of the pressure roller. Similar effects can be obtained by using chamois as a substitute for felt. In addition, the silicone resin particles themselves have P
There is a concern that the surface of the FA may be damaged. However, when the particles were applied using a felt cloth, no damage caused by the fine particles themselves was observed. Particles are thinly coated on the surface of the pressure roller which has been treated as described above. In this state, when used in the above-mentioned heat fixing device, toner adhesion on the surface of the pressure roller was not visually observed. Further, about 20,000 sheets of recording material were passed through the above-mentioned heat fixing device, and the fixing film 60 after image formation was loaded thereon. The fixing film 60 was configured to easily cause toner adhesion. While the toner hardly adhered to the pressure roller, the surface of the uncoated roller was stained. In addition to the above-described method of wiping off excess particles with a cloth or paper, it is also possible to blow off and remove the particles by wind pressure using an air compressor. Even with the use of the pressure roller manufactured by this method, the adhesion of dirt on the surface was improved. In consideration of mass production at a factory, the method of blowing off with this air pressure can simplify the work.

The effect of suppressing the toner adhesion by the application of the silicone resin as described above is considered to be caused by the following several reasons.

First, it is considered that the application of the silicone resin particles has an effect of polishing and removing dirt adhering to the surface of the PFA release layer.

The results obtained by coating the surface of the pressure roller with tospearls having different particle sizes and shapes and comparing toner stains are shown below.

[0033]

[Table 1]

According to Table 1, when fine particles having a particle size of 20.0 μm are used (No. 7), a large amount of dirt is generated on the pressure roller. This may be due to the fact that the particles are too large to completely fill the existing wound.
Also, in the case where fine particles having a small particle size of 0.5 to 0.8 μm are used (No. 6), some contamination occurs. The cause is not clear, but the particle size is too small,
The reason may be that the wound is not sufficiently buried. Further, with respect to the shape, even if the particles are irregularly shaped, there is an effect by coating (No. 3), but the spherical particles are better.

This is because the shape is indefinite,
It is considered that a spherical shape is desirable because the roller surface has minute scratches.

In Table 1, the evaluation of the surface contamination of the pressure roller is as follows.

Using a new pressure roller whose surface has been treated with Tospearl, single-sided and double-sided printing is performed with a halftone image. Then, the dirt due to toner adhesion on the surface of the pressure roller is visually evaluated, and if no dirt is attached, the level is marked as ◎. X level. A level of almost no stain was evaluated as a level, and a level of slightly stained was evaluated as a level.

As fine particles replacing the silicone resin particles used in this example, melamine resin particles (trade name:
Eposta S12, manufactured by Nippon Shokubai Co., Ltd., particle size: 1.2 μm
m, shape: spherical), the effect of the level ○ was obtained.

(Second Embodiment) Hereinafter, a second embodiment of the present invention will be described.

Another method of applying the silicone particles in Example 1 to the surface of the PFA release layer of the pressure roller will be considered. The configuration of the entire image forming apparatus and the configuration of the heat fixing device are the same as in the first embodiment.

Silicone particles having a particle diameter of 1 to 10 μm are liable to be scattered in the air due to the fact that the particles have a small specific gravity and the property that the particles are not easily aggregated, in addition to being fine. Therefore, such powders are very difficult to handle in consideration of workability based on mass productivity. Therefore, as a method of facilitating the application operation on the pressure roller, there is a method of dispersing and using in various organic solvents. Silicone fine particles are resistant to most organic solvents from alcohol, glycol ether, ketone and ester to hydrocarbon and chlorinated, and do not dissolve or swell even when immersed in various solvents It is known. In addition, since it has excellent dispersion viscosity when dispersed in a solvent that is an index of coating workability, utilizing these properties, a dispersion containing silicone particles is used to form a surface of the release layer of a pressure roller. If applied, the workability and safety are improved as compared with the case where the fine particles are applied as they are. As a solvent for dispersing the particles, toluene, xylene, MEK, IPA, cyclohexanone, or the like alone or a mixture thereof can be considered, and HS-1, HS-2, HS-3, in which silicone particles are dispersed in advance,
It is also possible to directly use a silicone coating material such as HS-4 (trade name of Toshiba Silicone Co., Ltd.). The coating method will be described below.

For example, as a method of applying the above HS-2 on the surface of the release layer of the pressure roller, spray, dip, brush, flow and the like can be considered. It should be noted here that when using an application member that directly contacts the surface such as a brush, it is important that the application member does not damage the surface. After applying it evenly to the surface, it is necessary to polish and clean the surface with the silicone resin particles in the solvent, and at the same time, rub the solvent on the surface with an intact cloth so that the particles are buried in the surface scratches . Finally, the excess solvent remaining on the pressure roller surface is removed. According to the above-described method, it is possible to perform the same treatment as that of the first embodiment on the surface of the pressure roller without scattering the fine particles into the air.

[0043]

As described above, according to the present invention,
The recording material on which the unfixed image is formed is passed between the fixing nips which are pressed against each other by the fixing member and the pressing member which are composed of the heating heater and the thin film or the fixing roller provided in the nip portion. Thus, in the image forming apparatus having a fixing device for fixing the unfixed image, the pressing member is formed of an elastic layer formed of silicone rubber or fluorine rubber on the outside of the support, and PTFE or PF on the outer layer.
A, after forming a releasable layer such as FEP, by applying lubricating particles to the surface to remove excess fine particles, and by making the releasable layer surface thinly coated with fine particles,
It is possible to reduce scratches and stains on the surface of the release layer which cause toner to adhere to the surface of the pressure member, and it is possible to prevent stains due to toner adhesion.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an image forming apparatus according to the present invention.

FIG. 2 is a configuration diagram of a heat fixing device according to the present invention.

FIG. 3 is a configuration diagram of a conventional heat fixing device.

FIG. 4 is a configuration diagram of a conventional heat fixing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Heater 12 Heat insulation stay holder 13 Fixing film 20 Pressure roller

Continued on the front page F-term (reference) 2H033 AA09 AA26 BA43 BA44 BB01 BB29 BB30 BB31 BE03 3J103 AA02 AA15 AA32 AA53 AA81 BA03 BA41 BA43 BA48 EA02 EA05 EA11 EA20 FA07 FA09 GA02 GA66 HA03 HA04 HA12 HA47 HA53 CA54 EB20

Claims (9)

[Claims] 1. An elastic roller having an elastic layer outside a support and a release layer outside the elastic layer, wherein lubricating particles are applied to the surface of the release layer. 2. The elastic roller according to claim 1, wherein the release layer is formed of a fluororesin. 3. The elastic roller according to claim 1, wherein the lubricating particles have a particle size of 1 to 10 μm. 4. The elastic roller according to claim 1, wherein the lubricating particles are lubricating resin particles. 5. The elastic roller according to claim 4, wherein the lubricating resin particles are silicone particles. 6. An unfixed toner image is formed on a recording material by passing the recording material on which the unfixed toner image is formed between nips maintained at a predetermined temperature between a fixing member and a pressing member. 6. A heat fixing device for fixing a permanent image as a permanent image, wherein the pressing member is the elastic roller according to claim 1, 2, 3, 4, or 5. 7. An elastic layer is formed on the outside of the support, and a release layer is further formed on the outer layer. A dispersion of lubricating particles is applied to the surface of the elastic layer and dried to form a lubricity on the surface of the release layer. A method for producing an elastic roller, wherein the particles are coated thinly. 8. The method according to claim 7, wherein the lubricating particles have a particle size of 1 to 10 μm. 9. The method for manufacturing an elastic roller according to claim 7, wherein the particle size of the release layer is made of a fluororesin.