JPH02150875A - Elastic rotating body and fixation device - Google Patents

Abstract

PURPOSE:To improve the property to transport sheet-like materials, such as paper, to be transported, fixability, wear resistance and, above all, durability by incorporating a packing material having the grain size larger than the grain size of fluororesin particles to be incorporated into a primer and fluoroplastic into a rubber material which forms an elastic layer. CONSTITUTION:This rotating body has a primer layer 5 consisting of a binder material contg. the fluororesin and aminosilane compd. between the elastic layer 4 and a resin layer 6 and further the packing material having good affinity to the primer is incorporated into the elastic layer 4. Since the packing material exists by being partially exposed to the boundary surface between the elastic layer 4 and the primer layer 5, the elastic layer 4 and the resin layer 6 are bonded in the extremely tight contact state. Further, the fluororesin is incorporated into the elastic layer 4 and, therefore, the resin layer 6 and the primer layer 5 are bonded to each other in the extremely tight contact state as the fluororesin of both the layers melt in each other at the time of calcination. The property to transport the sheet-like materials, such as paper, to be transported, the fixability, the wear resistance, and above all, the durability are greatly improved in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an elastic rotating body used in electrophotographic copying devices, printers, and various other image forming devices, and particularly relates to an elastic rotating body used in various image forming devices such as electrophotographic copying devices, printers, etc. The present invention relates to an elastic rotating body suitably used as a conveying or fixing roller or belt for conveying or fixing a sheet-like transfer material, recording material, etc. in an apparatus. Accordingly, the present invention also relates to a fixing device using such an elastic rotating body. The present invention will be described below mainly in relation to a fixing roller and a fixing device, but
It should be understood that the invention is not so limited.

Conventionally, in an image forming apparatus such as an electrophotographic copying device, a conveyance roller that conveys a sheet-like transfer material or recording material, which is generally paper, along a predetermined path has a conveyance property, Releasability and durability are required. In particular, the fixing roller must convey the transfer paper along a predetermined path while applying heat to the unfixed toner image on the transfer paper and preventing offset of the molten toner. Releasability, abrasion resistance, fixing properties and durability are required.

In order to meet the above requirements, an elastic layer 4 made of silicone rubber or the like is provided on the core metal 2, and a resin material is further coated on the elastic layer 4 and baked, so that the elastic layer 4 is made of the resin material. An elastic rotating body for fixing, that is, an elastic roller 6, having a structure in which a resin layer 4 is formed has been proposed.

In the fixing roller having such a structure, the thickness of the resin layer 4 is 15 to 20
Although it can be configured to be extremely thin (on the order of micrometers) and exhibits extremely excellent performance in terms of transportability, mold releasability, abrasion resistance, and fixing performance, it has had problems in terms of durability. In other words, after long-term use, the elastic layer 4 made of a rubber layer and the resin layer 6 made of a fluororesin or the like will partially peel off, making it unusable. The limit for fixing 10,000 to 50,000 sheets, that is, for copying, was the limit.

The present inventors have developed an elastic rotation for fixing that has a structure in which a resin layer made of the resin material is formed on the elastic layer by coating a resin material on the elastic layer and baking it, which has many advantages. As a result of numerous research experiments to improve the durability of the body, we have found that the surface shape of the primer at the boundary between the elastic layer and the resin layer and the elastic layer forming the boundary between the primer layer and the resin layer improves the durability of the elastic rotating body. This is a factor that has a large influence on the properties of the elastic layer, and when the filler mixed in the elastic layer is partially exposed and present on the surface, the voids formed when the filler is removed from the surface. It has been found that the durability of the elastic rotating body can be significantly improved by having holes coexist on the surface of the elastic layer.

The present invention has been made based on this new knowledge.

Therefore, an object of the present invention is to provide an elastic rotating body that has dramatically improved not only the transportability, fixing performance, and abrasion resistance of sheet-like objects such as paper but also particularly the durability. It is to be.

Another object of the present invention is to provide a fixing device using the above-mentioned elastic rotating body.

The above-mentioned object of the present invention is achieved by an elastic rotating body and a fixing device according to the present invention. In summary, in the present invention, a primer and a fluororesin material are sequentially coated on an elastic layer mainly made of a rubber material, and baked, thereby forming a primer layer and a resin layer made of a fluororesin material on the elastic layer. The primer is an elastic rotating body, and the primer is made of a binder material containing a fluororesin and a silane compound. An elastic rotating body is characterized in that a filler having a particle size of The filler is exposed on the surface of the layer, and pores are preferably formed on the surface of the elastic layer from which the filler is removed.The filler has a particle size of 1 μm.
The material is one or more selected from quartz powder, diatomaceous earth, metal powder, metal oxide powder, and ceramic, each having a diameter of m to 10 μm.

Further, according to the present invention, there is provided a fixing device comprising a fixing elastic rotor having a heat source and a pressing elastic rotor that presses against the fixing elastic rotor, wherein at least one of the elastic rotors is an elastic rotating body in which a primer layer and a fluororesin material are sequentially coated on an elastic layer mainly made of a rubber material, and then fired to form a primer layer and a resin layer made of a fluororesin material on the elastic layer. The primer is made of a binder material containing a fluororesin and a silane compound, and the rubber material forming the elastic layer has at least a particle size larger than the fluororesin particles contained in the primer. A fixing device characterized in that the filler and the fluororesin are mixed is obtained.

Support Next, the elastic rotating body according to the present invention will be explained in more detail with reference to the drawings.

FIGS. 1 and 2 show an embodiment in which the elastic rotating body according to the present invention is implemented in a roller used in a fixing device that heats and fixes a toner image in an electrophotographic copying apparatus.

The fixing device, as schematically illustrated in FIG. It is composed of a pressure roller IO that presses the transfer paper P carrying a toner image against a roller L. The fixing roller 1 and the pressure roller 10 have the same structure, and in order from the inside, they include a metal core 2, 12, a silane-based first primer layer 3, 13, an elastic layer 4, 14 made of silicone rubber, The second primer layer 5.15 is made of a binder material containing a fluororesin and an aminosilane compound, and the fluororesin layers 6, 16 have good mold releasability to prevent offset.

The fixing device detects the surface temperature of the fixing roller l and sets the surface temperature to the optimum temperature that can melt the toner, for example 160°C.
A temperature detection control means G1 for controlling the temperature to 200 DEG C. and an offset prevention liquid application means C for applying an offset prevention liquid such as silicone oil to the surface of the fixing roller 1 and also cleaning the surface are provided.

The fixing roller l is preferably made of a material with good thermal conductivity such as aluminum, and as the silane-based first primer layer, for example, DY39-012 (manufactured by Tomu Silicone Co., Ltd.) can be used. On the first primer layer, an elastic layer 4 (in this example, the layer pressure t is 0.3 mm to 0.0 mm is formed, which is mainly made of silicone rubber and further mixed with at least a filler and a fluororesin. , 8 mm, rebound resilience 55% to 85%), a primer layer formed on the elastic layer 4 and made of a binder material containing a fluororesin and an aminosilane compound, and a primer layer formed on the primer layer. and a resin layer 6 made of fluororesin. The fluororesin of the elastic layer 4, primer layer 5, and resin layer 6 is preferably PFA resin (tetrafluoroethylene resin/perfluoroalkoxyethylene resin copolymer), PTFE resin (
In this example, the layer thickness t2 is 10 μm to 25 μm, and the film strength is 50 kg.
/crr? It is considered to be more than .

Regarding the pressure roller IO, the pressure roller IO has the same structure as the fixing roller 1, but the core metal 12 is made of stainless steel, iron, etc., and the thickness of the elastic layer 14 is t3.
is thicker, for example, 4 mm to 10 mm, and has a rebound resilience of 55% to 85%. Further, the resin layer 16 uses a fluororesin such as PFA or PTFE like the fixing roller l, but the layer thickness t4 is 5 μm to 35 μm, and the film strength is 50 μm.
Kg/crri or more.

The fixing roller 1 and the pressure roller 1O are symmetrical, and preferably, the fixing roller 10 (or the pressure roller 10) has a slightly smaller diameter at the center in the axial direction than at both ends. It is considered to be an inverted crown type.

The present invention can be suitably applied to one or both of the fixing roller 1 and the pressure roller 1O, and the present embodiment will be described with reference to the fixing roller 1.

According to the present invention, the second primer layer 5 made of a binder material containing a fluororesin and an aminosilane compound is formed on the elastic layer 4. Fluororesin is used to strengthen the adhesion with the upper fluororesin coating layer, and is a homopolymer of tetrafluoroethylene,
Alternatively, a copolymer is used. The main component of the binder substance is aromatic polyamideimide resin, polyimide resin, polyarylene sulfide resin such as polyphenylene sulfide resin, or alkali or amine silicate, alkyl silicate, lithium polysilicate, etc., as a heat-resistant resin that is compatible with the fluororesin. silicate,
Alternatively, a silicon compound such as silica colloid is used.

Furthermore, the aminosilane compound can ensure adhesion to silicone rubber. Representative examples include α-aminopropyltriethquinsilane, N-β
-Aminoethyl-α-aminopropyltrimethoxysilane, N-()rimethoxysilylprobyl)ethylenediamine, N-β-aminoethyl-α-aminopropylmethyldimethoxysilane, α-ureidopropyltriethoxylane, β-amino Examples include ethyl-β-aminoethyl-α-aminopropyltrimethoxysilane. The amount of the aminosilane compound added is preferably 1 to 30 parts by weight, more preferably 1 to 2 parts by weight per 100 parts by weight of the binder material.
It is 0 parts by weight. An aqueous dispersion of this composition is applied onto the silicone rubber layer and dried to form a second primer layer.

Furthermore, according to the present invention, as shown in FIG. The dispersed filler 50 is present partially exposed.

According to the results of research experiments conducted by the present inventors, by partially exposing the filler on the surface of the elastic layer, the exposed portion of the filler has an affinity with the fluororesin of the primer layer 5 forming the upper layer of the elastic layer 4. It has been found that the adhesive strength of the elastic layer 4 and the primer layer 5 can be improved, that is, the compatibility between the elastic layer 4 and the primer layer 5 can be improved, and as a result, the adhesive strength between the elastic layer and the primer layer can be increased.

Furthermore, the filler 50 on the surface of the elastic layer 4 is naturally removed during the manufacturing process of the rubber roller, or a predetermined amount is forcibly removed, and pores 30 are formed and present on the surface of the elastic layer 4. It has also been found that the degree of adhesion between the elastic layer and the primer layer is further increased. That is, the primer of the primer layer 5 formed on the elastic layer 4 enters the holes 30 and is locked, realizing a so-called anchor effect, and furthermore, the fluororesin contained in the primer layer 5 The non-resin of the elastic layer and the fluororesin of the primer layer enter into the pores 30 and during firing, the non-resin of the elastic layer and the fluororesin of the primer layer melt together on the surface of the elastic layer. The fluororesin of the layer melts together, and the elastic layer and primer layer achieve a stronger bond, resulting in less peeling between the two layers even after long-term use, significantly improving durability. For this reason, the filler mixed into the elastic layer allows the fluorocarbon particles contained in the primer layer to more easily enter into the pores 30 formed by removing the filler. The particle size of the filler is larger than the fluororesin particle size of the primer layer, which is usually 1 μm or less.Also, if the particle size of the filler is too large, the rubber surface may become rough and uneven fixing may occur. , the problem of loss of rubber elasticity arises, and according to the results of research experiments conducted by the present inventors, the limit is 20 μm.

Therefore, the filler added to the elastic layer has a particle size of 1 μm.
m to 20 μm, one or more selected from quartz powder, diatomaceous earth, metal powder, metal oxide powder, and ceramic are used, and per 100 parts by weight of the rubber material,
30 to 120 parts by weight, preferably 40 to 90 parts by weight are incorporated. In addition, the fluororesin mixed and dispersed in the elastic layer is
It is suitable to mix 30 parts by weight, preferably 5 to 25 parts by weight.

To explain in more detail, according to the results of research experiments conducted by the present inventors, the bonding force between the elastic layer and the primer layer increases with the amount of filler mixed in.
It has been found that when the amount is 120 parts by weight or more compared to 0 parts by weight, the hardness of the elastic layer increases, causing problems in terms of conveyance and fixing performance as a fixing roller. Therefore, the amount of filler mixed is 30 parts by weight per 100 parts by weight of silicone rubber.
~120 parts by weight, preferably 40 to 90 parts by weight.

Moreover, it is more preferable to increase the ratio of the pores 30 because the resin agent in the resin layer 6 enters the pores 30 in the elastic layer 4 and the anchoring effect between both layers increases.

The fixing roller 1 (and pressure roller 10) as described above according to the present invention can be manufactured by various methods, but a preferred manufacturing method is as follows.

Since the fixing roller 1 and the pressure roller 10 can be manufactured by the same method, only the fixing roller 1 will be described.

In the fixing roller l, first, a core metal 2 is finished to a predetermined diameter using aluminum or the like, and an elastic layer 4 is formed thereon. Usually, the elastic layer 4 is a silicone rubber layer (thermal conductivity 1.4X
10-' ~1.5X 1O-3cai! /cm-s
ec-K) is formed by vulcanization molding.

In order to form the roller according to the present invention, when forming the elastic layer 4, for example, quartz powder having a particle size of about 1 to 20 μm is added as a filler in the silicone rubber that is the material of the elastic layer 4. The silicone rubber layer is vulcanized and molded with the filler and fluororesin mixed therein to produce a silicone rubber roller of a desired shape. Preferably, the silicone rubber roller is of a so-called crown type, in which the center portion in the axial direction has a slightly smaller diameter than both end portions.

Next, if desired, although not essential, the surface of the silicone rubber roller is pressed against the polishing cloth with a predetermined force over the entire axial direction of the roller, for example, a pressing force of IKg/crrr to rotate the roller and rotate the polishing cloth axially. The pores 30 on the surface of the roller are enlarged by reciprocating the roller in the direction and forcibly removing the quartz powder on the surface.

The amount of pores, that is, the amount of filler removed, can be adjusted by changing the type of polishing cloth, pressing force, etc. Although the quartz powder on the surface of the silicone rubber roller can be removed by sandblasting or the like, the above method is more preferable.

A primer made of a binder containing a fluororesin and an aminosilane compound is applied to the surface of the rubber roller thus formed and dried.

Further, the particles of the fluororesin powder in the primer are 1 μm or less, preferably 0.5 μm or less, while the particles of the quartz powder mixed in the elastic layer are 1 to 20 μm as described above.
μm1 is preferably 3 μm or more. By selecting the shapes of the fluororesin powder and quartz powder in this way, the pores 3 that exist on the surface of the elastic layer after the quartz powder is removed
0 is sufficiently larger than the shape of the fluororesin powder,
As a result, the fluororesin powder enters the pores 30 existing on the surface of the elastic layer, producing an anchor effect, that is, an adhesive effect.

On the primer layer formed as described above, an unfired fluororesin, for example, a fluororesin in a dispersion state (fluororesin powder dispersed in water with a surfactant),
Enamel or powdered fluororesin is applied to a uniform thickness over the entire length of the rubber roller by spray coating, electrostatic coating, powder coating, or the like.

The fluororesin dispersion coated to a uniform thickness as described above becomes a film-like resin coating when heated to, for example, the crystal melting point of the fluororesin, 327°C or higher.
The silicone rubber roller coated with unfired fluororesin has a temperature higher than the crystal melting point (327°C or higher for PTFE and 327°C or higher for PFA).
06°C or higher).

However, although silicone rubber itself has excellent rubber properties such as rebound modulus and compression set, when it is heated above 300°C, especially above 306°C or 327°C, it causes smoke and depolymerization. This not only hinders the formation of a high-quality fluororesin layer, but also causes the silicone rubber itself to lose its rubber properties.

Therefore, it is preferable to use a firing method that maintains the silicone rubber roller itself at a temperature that does not cause smoke or depolymerization (maximum 30,000 or less), while heating the fluororesin coated layer to a high temperature above its crystal melting point. . More specifically, a method may be used in which the unfired fluororesin on the surface is rapidly heated while rapidly cooling the rubber layer from inside the core metal.

Although this method essentially forms a thermal gradient in the silicone rubber in its thickness direction,
°C, but for unsintered fluororesin, the temperature is higher than its crystal melting point (specifically, for PTFE, it is 340 °C or higher, which is 327 °C or higher).
A firing temperature of 380° C.) is applied for about 5 minutes to 10 minutes.

After performing the firing, the roller is rapidly cooled. This rapid cooling results in a crystallinity of 95% or less on the silicone rubber roller and a tensile strength of 50 kg/cn? Above, the contact angle with water is 1
The baked fluororesin surface layer, which exhibits resin properties of 00 degrees or higher, adheres strongly to the rubber roller through the elastic layer, that is, the primer layer on the rubber roller surface, and the partially exposed filler 50. In addition, it is formed in a sufficiently thick state. At the same time, the fluororesin material that has entered the pores 30 on the surface of the rubber roller is also fired in close contact with the rubber roller, resulting in a strong bonding force (anchor effect).

Therefore, in the fixing roller, the lower layer silicone rubber itself exhibits the desired rubber properties almost in the same way as before the resin layer was formed, the surface fluororesin layer exhibits completely baked resin properties, and the silicone rubber itself that is mixed into the elastic layer exhibits the desired rubber properties. The adhesion of these layers is strengthened by fillers and fluororesins.

In other words, according to the present invention, a filler having good affinity with the primer is mixed in the elastic layer, and is partially exposed at the interface between the elastic layer and the primer layer, so that the filler has good elasticity. The primer layer and the resin layer are bonded in extremely close contact, and since the fluororesin is mixed in the elastic layer, as mentioned above, the fluororesin in both the primer layer and the elastic layer is baked. Sometimes they melt together and become bonded in an extremely intimate state. Furthermore, the resin of the primer layer enters into the pores existing on the surface of the elastic layer, exerting an anchoring effect between the elastic layer and the resin layer.

Therefore, the fixing roller according to the present invention has high (improved) durability and can sufficiently withstand passing of 200,000 sheets or more.

Hereinafter, the present invention will be explained in more detail by giving Examples and Comparative Examples.

A fixing roller 1 according to the present invention was manufactured as follows.

First, the outer diameter of the center part is 48.435 mm (thickness 5 mm).
An aluminum core bar 2 finished with a reverse crown fi of 125 μm) was prepared, and its surface was sandblasted, then degreased and dried.

A silicone-based first primer was applied to a thickness of 7 μm on the core bar 2, heated at 120°C for 20 minutes, wrapped with a heat-curable silicone rubber sheet, and press-vulcanized at 160°C for 30 minutes. The rubber was then ground and molded to a thickness of 0.5 mm to produce a silicone rubber roller.

As the heat-curable silicone rubber, 15 parts by weight of PTFE particles with an average particle size of 0.2 μm, 55 parts by weight of quartz powder with an average particle size of about 8 μm, and 100 parts by weight of methyl vinyl silicone rubber are used. Contains 10 parts by weight of fumed silica with a diameter of approximately 0.015 μm, and has a JIS A hardness of 65.
A material made of rubber was used.

Next, a first component consisting of PPS finely pulverized to an average particle size of 10 μm (Philips Co., USA [Rydon U-IJ)] and an N-methylpyrrolidone solution of polyamideimide (FAI) resin (Rope Phthal R200
J, concentration 30%), ion-exchanged water and sodium acrylic sulfate were pulverized and mixed in a ball mill for 48 hours to form an aqueous polyamide-imide dispersion (resin content approximately 30%, surfactant content 10%/FAI). The second component is PPS and P
The mixture was mixed so that the ratio of AI was 10/1, pulverized and mixed in a ball mill for 20 hours, and the resulting mixture was mixed with 60% PTFE.
Aqueous suspension (Daikin: Polyflon Dispersion D
-1 and α-aminopropyltriethoxysilane were mixed at a weight ratio of FAI10PPS/PTFE/αaminopropyltriethoxysilane=100/l 00/20 to prepare an aqueous dispersion as a primer.

Apply this primer on the silicone rubber layer and
After drying at C, the roller was left in a low temperature environment of 10°C. After the roller was sufficiently adapted to the environment, a PTFE solution was coated with a roll coater in a thickness of 20 μm under a 10'C environment, and the water was removed by drying at a 250°C environment for 3 minutes.

The reason why the fluororesin solution is coated in a low-temperature environment is to prevent the fluororesin from cracking during drying.

Then, put the roller in a 450℃ oven for 2 minutes.
After TFE was fired, it was rapidly cooled (water-cooled).

By quenching after the above-mentioned firing, the crystallinity is 95% or less and the tensile strength is 50 kg/c on the silicone rubber roller.
The surface layer of the baked fluororesin, which exhibits resin characteristics such as a contact angle of 100 degrees or more with respect to water, has strong adhesion and adhesion to the rubber roller and is sufficiently thick.
It was formed with a thickness of μm.

The final outer diameter of the fixing roller 1 was 49.475 mm.

A pressure roller 10 was produced in the same manner. However, the core metal is made of iron, and the thickness of the elastic layer 14 and the resin layer 16 is 6.
mm and 25 μm, and the final roller outer diameter was the same as that of the fixing roller l.

Using the above-mentioned fixing roller 1 and pressure roller 10, tests were conducted on fixing properties, release properties, adhesion properties, and durability. The test conditions for the evaluation were as follows: the surface temperature of the fixing roller 1 was set at 18
Controlled at 0°C, paper feed speed 27 for A4 size paper
Paper was fed at a speed of 0 mm/sec and a paper feed rate of 40 sheets/min.

The fixing property was evaluated by the fixing rate determined by forming a solid black circular image with a diameter of 24 mm at 9 locations on Japanese Industrial Standard A4 size transfer paper under a 100C environment and weighing Bog/rd. The fixing rate is determined by the density of the circular image.

Bind the image and print it on a non-woven fabric called Kojin Wiper (
Manufactured by Kojin Co., Ltd., product name: Vapor waste; soft like tissue paper and has a rough surface with a wood grain pattern, crepe rate 32±3%, weight 35±3g/d, tensile strength (longitudinal direction) 0.4Kg /15mm or more. Thickness approximately 200μ
40g/crrf (disposable type wiping paper)
If the image density after rubbing back and forth for 1 degree under a load of is , then the fixing rate is calculated as (D+/Do) x 100%.

Note that the density, Do is a value measured with a Macbeth reflection densitometer, and Do is an image density of 1.0≦D. The image density is adjusted to be within the range of ≦1.1.

The releasability was determined by printing solid black on the entire surface of the transfer paper under the same conditions as above, passing 100 sheets of paper continuously, and then passing a blank paper through the transfer paper and observing the state of dirt on the white paper.

As mentioned above, the durability is determined by increasing the surface temperature of the fixing roller l to 18
Control the temperature to 0℃ and feed A4 size paper at a paper feed speed of 270℃.
The paper was continuously fed for 7 seconds at a paper feed rate of 40 sheets/min, and the number of sheets was represented by the number of sheets when the resin layer started to peel off from the elastic layer.

Under the above test conditions, the fixing properties, release properties, adhesion properties, and durability of the fixing roller 1 of Example 1 and the pressure roller 10 were tested. The test results were as follows.

・Fixability: 90% at worst point, 94% on average (9 locations) ・Release ability: J! 5.Durability: No abnormality was observed in either the fixing roller or the pressure roller even after 30% of the sheets had been passed, and it was possible to continue the process.

It was confirmed that each roller of Example 1 according to the present invention had practically sufficient performance across each evaluation item.

L Comparison 1" A fixing roller and a pressure roller were produced in the same manner as in Example 1. In this comparative example, the silicone rubber used as the elastic layer contained 2 parts of fumed silica having an average particle size of about 0.015 μm per 100 parts by weight of methyl vinyl silicone rubber.
This example was different from Example 1 in that PTFE particles and large-sized quartz powder were not mixed, a rubber with a JIS A hardness of 50° was used, and no primer was used.

Further, the resin layer used PTFE dispersion having larger particles (average particle size: 0.3 μm) than the fumed silica mixed in the elastic layer.

The fixing properties, release properties, adhesion properties, and durability of the fixing roller 1 and the pressure roller 10 of Comparative Example 1 were tested under the same test conditions as described in Example 1, and the test results were as follows. It was on the street.

・Fixing performance: 92% at the worst point, 94% on average (9 locations) ・Releasability: No stains ・Adhesiveness: 60 g / 20 mm ・Durability: Both the fixing roller and pressure roller can withstand 10,000 sheets A portion of the resin layer was lifted at the claw portion.

Each roller of Comparative Example 1 had the same performance as the roller of Example 1 in terms of fixing properties and release properties, but the roller of this Comparative Example had poor adhesion and durability compared to the roller of the present invention. It was inferior in points.

A fixing roller and a pressure roller were manufactured in the same manner as in Example 1 above. In Example 2, a predetermined amount of filler was removed from the surface of the heat-vulcanized silicone rubber, pores 30 were forcibly formed on the surface of the elastic layer, and then a resin layer was formed. It was different.

In other words, the surface of the silicone rubber roller after vulcanization molding is
Sandblasting is performed to expel the quartz powder present on and near the roller surface to the rubber surface side, and then
1 kg/ctrf of abrasive cloth over the entire roller axial direction
The roller was rotated at 4 revolutions per minute, and the abrasive cloth was reciprocated in the axial direction at 50 mm for 7 seconds for 30 seconds to forcibly remove the quartz powder on the roller surface.

Next, the roller surface was washed with water and dried. A large number of holes 30 were formed on the roller surface.

The subsequent coating of a fluororesin and the formation of a resin layer by firing were performed in the same manner as in the examples.

Under the same test conditions as described in Example 1, the fixing properties, release properties, adhesion properties, and durability of the fixing roller 1 and the pressure roller 10 of Example 2 were tested. The test results were as follows.

・Fixing performance: 90% at the worst point, 93% on average (9 locations) ・Release performance: No stains at all ・Durability: No abnormalities were found with the fixing roller or pressure roller even after 40% sheet feeding. It was possible to continue further.

It was confirmed that each roller of Example 2 according to the present invention had practically sufficient performance across each evaluation item.

Incidentally, when compared with Example 1, the fixing properties were the same, but the durability was greatly improved.

The present invention has shown an example of a heat fixing device as an example of a preferable application of the elastic rotating body, but the present invention is also applicable to a pressure fixing device that fixes a toner image with light pressure, a transfer simultaneous fixing device, etc. It can also be applied to pressure fixing devices, etc. Further, although the above embodiment has a two-roller configuration, it is possible to use a fixing device with three or more rollers, and the present invention can also be applied to heating rollers, pressure rollers, and mold release rollers of various devices. A agent supply roller, a cleaning roller, and others may be in the form of a belt as shown in FIG. 10 (for example, an intermediate belt for simultaneous transfer and fixing). In particular, when a fluororesin is used as the resin layer, it has mold releasability and elasticity, so it has transferability and cleaning properties (however, as a cleaning roller, cleaning is performed based on surface energy etc.) Moreover, the advantage of excellent wear resistance can be exhibited in each application.

As described above, the elastic rotating body according to the present invention has a primer layer made of a binder material containing a fluororesin and an aminosilane compound between the elastic layer and the resin layer, and further includes a primer layer in the elastic layer. is mixed with a filler that is compatible with the primer,
Because it is partially exposed at the interface between the elastic layer and the primer layer, the elastic layer and the resin layer are bonded in an extremely intimate state, and furthermore, the fluororesin is mixed into the elastic layer. In addition, the fluororesin of both layers melts during firing, and the resin layer and primer layer are bonded together in an extremely intimate state.Furthermore, the pores existing on the surface of the elastic layer are filled with the resin of the primer layer. enters the elastic layer and exerts an anchoring effect between the elastic layer and the resin layer, which dramatically improves not only the conveyance, fixation, and abrasion resistance of sheet-like objects such as paper, but also the durability. It has the effect of improving performance.

Furthermore, according to the present invention, the adhesion strength, that is, the adhesion force, between the elastic layer and the resin layer is increased, and the fixing effect is excellent even when fixing more than 200,000 sheets, especially as a fixing rotating body that acts under heating conditions. This can be done while maintaining mold releasability.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of an embodiment of an elastic rotating body and a fixing device having the same according to the present invention. FIG. 2 is a partially enlarged explanatory view of the fixing roller shown in FIG. 1. FIG. FIG. 3 shows another embodiment of the elastic rotating body according to the present invention. FIG. 4 is a sectional view of a conventional fixing roller. l ・・・・・・・・・・・・・・・Heating roller 3.
13......First primer layer 4, 14 6, 16 Elastic layer 2nd primer layer Resin layer Pressure roller Hole filler 81,,'>C Lagoon 2

Claims (14)

[Claims] (1) An elastic rotating body in which a primer layer made of the above-mentioned primer and a resin layer made of a fluororesin material are formed on the elastic layer by sequentially applying a primer and a fluororesin material on the elastic layer and baking them. The primer contains a fluororesin, and the rubber material forming the elastic layer contains at least a filler having a particle size larger than the fluororesin particles contained in the primer and a fluororesin. An elastic rotating body characterized by comprising: (2) A filler is exposed on the surface of the elastic layer forming a boundary between the elastic layer and the primer layer, and pores are formed by removing the filler. The described elastic rotating body. (3) The filler is one or more types selected from quartz powder, diatomaceous earth, metal powder, metal oxide powder, and ceramic, each having a particle size of 1 μm to 10 μm. Or the elastic rotating body according to item 2. (4) The elastic rotating body according to claim 3, wherein the primer is made of a binder material containing a fluororesin and an aminosilane compound, and the rubber material is silicone rubber. (5) 30 to 1 filler per 100 parts by weight of rubber material
The elastic rotating body according to any one of claims 1 to 4, wherein 20 parts by weight and 3 to 30 parts by weight of fluororesin are mixed. (6) The elastic rotating body according to any one of claims 1 to 5, wherein the elastic rotating body is roller-shaped. (7) The elastic rotating body according to any one of claims 1 to 5, wherein the elastic rotating body is belt-shaped. (8) In a fixing device comprising a fixing elastic rotor having a heat source and a pressing elastic rotor that is in pressure contact with the fixing elastic rotor, at least one of the elastic rotors is mainly made of a rubber material. An elastic rotating body in which a primer layer and a fluororesin material are formed on the elastic layer by sequentially applying a primer and a fluororesin material on the elastic layer, and baking the primer and a fluororesin material. contains a fluororesin, and the rubber material forming the elastic layer contains at least a filler having a particle size larger than the fluororesin particles contained in the primer and the fluororesin. Fixing device. (9) A filler is exposed on the surface of the elastic layer forming a boundary between the elastic layer and the primer layer, and pores are formed by removing the filler. The fixing device described. (10) Claim 8, wherein the filler is one or more types selected from quartz powder, diatomaceous earth, metal powder, metal oxide powder, and ceramic, each having a particle size of 1 μm to 10 μm. Or the fixing device according to item 9. (11) The fixing device according to claim 10, wherein the primer is made of a binder material containing a fluororesin and an aminosilane compound, and the rubber material is silicone rubber. (12) The amount of filler is 30 to 100 parts by weight of the rubber material.
The fixing device according to any one of claims 8 to 11, wherein 120 parts by weight and 3 to 30 parts by weight of fluororesin are mixed. (13) The fixing device according to any one of claims 8 to 12, wherein the elastic rotating body is roller-shaped. (14) The fixing device according to any one of claims 8 to 12, wherein the elastic rotating body is belt-shaped.