JPH0934285A - Heat fixing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the degradation in an adhesion property to a paper fixing device and to improve fixing efficiency by forming a specific fluorine- contained silicone oil coating film on the surface of a fixing member on the side in contact with a recording material. SOLUTION: The recording material 6 carrying a toner image 7 is passed between an upper roller 1 and a lower roller 5, by which the toner image 7 is thermally melted and fixed onto the recording material. The fluorine-contained silicone oil coating film having the constitutional unit expressed by formula is formed on the surface 2 of the upper roller 1. The recording material 6 contains calcium carbonate having a number average primary particle size 0.1 to 3.0μm. In the formula, X denotes 1 to 4C satd. hydrocarbon group or aryl group. Rf denotes 2 to 10C fluoroalkyl group; (n) denotes an integer from 1 to 4. The silicone oil may have a copolymer structure with dimethyl silicon, phenyl methyl silicon, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat fixing method, and more particularly to a heat fixing method having good adhesion to paper and good fixing efficiency.

[0002]

2. Description of the Related Art Conventionally, in electrophotography, a heat roller fixing method has been favored because it has a high thermal efficiency of a toner image carried on a recording material and is suitable for high speed fixing. This heat roller fixing method is a method in which a recording paper carrying a toner image is passed between a fixing roller having a built-in heat source and a pressure roller to heat and fix the toner on the recording paper.

This heat roller fixing method has the above-mentioned advantages, but on the other hand, when a transfer paper having a high negative charging property is used, there is electrostatic repulsion, and the adhesion to the roller becomes low. The heat transfer is insufficient and the heat fixing rate becomes poor.

In order to prevent the occurrence of the offset phenomenon in the heat roller fixing method, a technique of supplying dimethyl silicone oil to the surface of the fixing roller has been proposed in the past. However, dimethyl silicone oil has a positive charging property and is a neutral paper. Since calcium carbonate used as a filler in the toner has a positive charging property, the neutral paper is likely to repel, and as a result, the adhesiveness of the paper to the fixing device is reduced, so that the fixing efficiency tends to be reduced. .

In recent years, a thermal fixing method using a fluorine-containing silicone oil has been proposed because it has good wettability to a fixing roller and uniform coating is possible. However, the fluorine-containing silicone oil has a negative charging property. Since kaolin, talc, etc., which are generally used as a filler in acidic papers, have a negative charge property, and as a result, the papers using these have a negative charge property, the fluorine-containing There is a problem in that the adhesion of paper to the fixing device is reduced due to electrostatic repulsion to the fixing device using the system silicone oil, and in this case also the fixing property is reduced. It has also been found that when the adhesion of the paper to the fixing device is improved, the fixing roller and the film are damaged.

[0006]

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a thermal fixing method using a fluorine-containing silicone oil, and to adhere the paper to the fixing device by electrostatic repulsion at the fixing section. With excellent fixing efficiency
Another object of the present invention is to provide a fixing roller and a thermal fixing method that does not cause film scratches.

[0007]

The above object of the present invention is achieved by the following constitution.

[0008] 1. In the thermal fixing method, a moving fixing member, a pressure-bonding member for pressing a moving recording material to the fixing member, and a heating unit for melting the toner image on the recording material through the fixing member are provided. A fluorine-containing silicone oil coating film having a structural unit represented by the following general formula [I] is formed on the surface of the member that contacts the recording material, and the recording material has a number average primary particle diameter of 0.1 to 3 A heat fixing method characterized by containing calcium carbonate of 0.0 μm.

[0009]

Embedded image

In the formula, X represents a saturated hydrocarbon group having 1 to 4 carbon atoms or an aryl group, R _f represents a fluoroalkyl group having 2 to 10 carbon atoms, and n represents an integer of 1 to 4.

2. 2. The heat fixing method according to the above 1, wherein the fixing member is a fixing roller having the heating unit built therein.

In this construction, by positively charging the chargeability of the paper itself, it is possible to improve the adhesion to a fixing device using a fluorine-containing silicone oil having a specific structure, thereby increasing the fixing rate. It is estimated to be possible.

The present invention will be described in detail below.

Although it is essential that the silicone oil of the present invention has a repeating unit having the structure represented by the above general formula [I], it has a copolymer structure with dimethylsilicon, phenylmethylsilicon, diphenylsilicon or the like. You may have. The fluorinated silicone oil of the present invention is preferably a liquid having an appropriate viscosity when used. Therefore, fluorine-containing silicone oil of the present invention is preferably viscosity 20～L000 _CS at 25 ° C., more preferably be those having a viscosity of l00~500 _CS.

The adjustment of the viscosity can be controlled by adjusting the degree of polymerization. This viscosity indicates the dynamic viscosity, A
According to STMD445-46T or J1SZ8808, it is measured by an Ubbelohde viscometer.

When the fluorine-containing silicone oil of the present invention is a copolymer, the structural unit represented by the general formula [I] of the present invention is contained in an amount of 20 to 99.9% in view of the achievement of various objects of the present invention. If you have. If it is less than 20%, the effect of the fluorinated silicone oil of the present invention will not be exhibited, and the effect of other components, that is, the effect of the fluorinated silicone oil of the present invention will decrease.

In the method for producing a fluorine-containing silicone oil of the present invention, a dialkyl-substituted dichlorosilane is prepared by the reaction of silicon with an alkyl chloride, and hydrolysis is carried out using the same, as in the ordinary silicone oil production method. To form a siloxane, and then to form a cyclic oligomer or a linear oligomer, and then polymerize these to synthesize.

Although the fluorine-containing silicone oil compound of the present invention has a fluorinated alkyl group in its side chain,
In this case, it can be easily produced by using a fluorine compound having a chloro group at the terminal, for example, one having a structure represented by the following general formula, instead of alkyl chloride.

Z- (CF ₂ ) m (CH ₂ ) nCl Here, m represents an integer of 2 to 10 and n represents an integer of 1 to 4. Z represents a hydrogen atom or a fluorine atom.

Specific examples include compounds having the structures shown below.

(A) CF ₃ CF ₂ CH ₂ Cl (B) CF ₃ CF ₂ CF ₂ CH ₂ Cl (C) CF ₃ CF ₂ CF ₂ (CH ₂ ) ₂ Cl (D) CF ₃ CF ₂ CF ₂ CF _{2 (CH 2) 2 Cl (} E) CF 3 CF 2 CF 2 CF 2 CF 2 CH 2 Cl (F) CF 3 CF 2 CF 2 CF 2 CF 2 (CH 2) 3 Cl (G) CF 3 CF 2 CF _{2 CF 2 CF 2 CF 2 CH} 2 Cl (H) CF 3 CF 2 CF 2 CF 2 CF 2 CF 2 CF 2 CH 2 Cl (l) HCF 2 CF 2 CH 2 Cl (J) HCF 2 CF 2 CF 2 CH _{2 Cl (K) HCF 2 CF} 2 CF 2 (CH 2) 2 Cl (L) HCF 2 CF 2 CF 2 CF 2 CH 2 Cl (M) HCF 2 CF 2 CF 2 CF 2 (CH 2) 2 Cl (N _{) HCF 2 CF 2 CF 2 CF} 2 (CH 2) 4 Cl (O) HCF 2 CF 2 CF 2 CF 2 CF 2 (C _{2) 3 cl (P) HCF} 2 CF 2 CF 2 CF 2 CF 2 CF 2 CH 2 Cl As the alkyl chloride to introduce an alkyl group other than fluorinated alkyl group in the present invention include methyl chloride, ethyl chloride, propyl chloride Butyl chloride can be mentioned.

In the present invention, in order to exert the effect of the present invention by uniformly attaching the fluororesin to the fixing roll coated by using the silicone oil substituted with the fluoroalkyl, the alkyl fluoride is used. The number of fluorine atoms in the substituted silicone oil contributes greatly. Therefore, the alkyl fluoride has 1 to 10 carbon atoms, and the portion directly bonded to the silicon atom is a methylene chain. Furthermore, the preferable range of alkyl fluoride is 2-8. If the number of fluorinated alkyl carbons is excessive, there will be a problem in the flow characteristics when heat is applied. Further, when the fluorinated alkyl is not contained, the wettability with respect to the surface of the heat roll coated with the fluororesin is not improved, and a uniform oil film cannot be formed.

The structure of the fluorine-containing silicone oil represented by the general formula [I] of the present invention is shown below.

[0024]

Embedded image

[0025]

Embedded image

Here, a and b represent integers of 1 or more, preferably 10 to 2000, and more preferably 100 to 1000.

1. Heat Fixing Method The heat fixing method of the present invention is roughly classified into a heat roller fixing method and a method of heating a moving film material.

The heat fixing method preferably applied to the present invention will be described below.

The hot roller fixing method of the present invention will be described with reference to FIG. 1. The surface 2 is made of iron, aluminum or the like coated with, for example, tetrafluoroethylene or polytetrafluoroethylene-perfluoroalkyl vinyl ether copolymers. It is formed of an upper roller 1 having a heating source 4 inside a metal cylinder 3 and a lower roller 5 made of silicon rubber or the like. Specifically, a linear heater is provided as the heating source 4, and the surface temperature of the upper roller 1 is heated to about 110 to 220 ° C. The recording material 6 carrying the toner image 7 of the present invention is passed between the upper roller 1 and the lower roller 5 to fix the toner image 7 on the recording material by heat fusion. In the conventional heat roller fixing method, a part of the melted toner is fused to the upper roller 1, and after one rotation, the toner fused to the upper roller 1 is fixed to another portion of the recording material. If the toner is generated and is extremely heavy, the toner fused to the upper roller 1 is not separated from the recording material and is wound around the upper roller 1 together with the recording material. This causes a so-called wrapping phenomenon and stains the surface of the fixing roller. It was In the fixing section, pressure is applied between the upper roller 1 and the lower roller 5 to deform the lower roller 5 and form a so-called nip. The nip width is 1 to 10 mm, preferably 1.5 to 7 mm
It is. The fixing linear velocity is preferably 40 to 400 mm / sec. If the nip width is narrow, heat cannot be uniformly applied to the toner, and uneven fixing tends to occur. On the other hand, when the nip width is wide, toner melting is promoted, and the offset phenomenon is likely to occur.

In the heat roller fixing method of the present invention,
A fluorine-containing silicone oil coating film of the present invention is formed on the surface 2 of the upper roller 1, and the various objects of the present invention are efficiently achieved by the interaction between the coating film and the recording material of the present invention. To be done. The formation of the fluorine-containing silicone oil coating film of the present invention on the surface 2 of the upper roller 1 is performed as follows, for example.

That is, the impregnating roller 8 is pressed against the longitudinal surface 2 of the upper roller 1 and rotates in the direction of the arrow. The impregnating roller 8 is impregnated with the fluorine-containing silicone oil of the present invention in advance, and at the time of fixing, the impregnating roller 8 is coated with a small amount of fluorine-containing silicone oil on the surface of the upper roller 1 as the upper roller 1 rotates. As a result, the fluorine-containing silicone oil coating film of the present invention is formed on the surface 2 of the upper roller 1.

The latter fixing method will be described with reference to FIG. 2. The low heat capacity linear heating element 1 fixedly supported by the apparatus.
5 has a thickness of 0.2 to 5.0 mm, preferably 0.5 to
3.5 mm, width 10-15 mm, longitudinal length 240
〜400mm alumina substrate 17 with 1.0〜resistive material
It is applied to 2.5 mm and is energized from both ends. The energization is given by changing the pulse width according to the amount of energy released, the temperature controlled by the temperature sensor 16 with a pulse waveform of DC 100V with a cycle of 25 msec. In the case of the temperature T1 detected by the temperature sensor 16 in the low heat capacity linear heating element 15, the surface temperature T2 of the film material 14 facing the resistance material is lower than the temperature T1.
Here, the temperature T1 is preferably 110 to 220 ° C., and the temperature T2 is preferably 0.5 to 10 ° C. lower than the temperature T1. The film material surface temperature T3 at the portion where the film material 14 is peeled off from the toner fixing surface is almost equal to T2. In this way, the film material moves in the same direction as the recording material by coming into contact with the heating element whose energy and temperature are controlled. The film material 14 has a thickness of 1
0 to 35 μm heat resistant film, for example, polyester,
The film is preferably a film obtained by coating a release material layer of polyperfluoroalkyl vinyl ether, polyimide or polyether imide with a conductive material added to at least a fluororesin such as Teflon for 5 to 15 μm, and more preferably an endless film material. Generally a total thickness of 10-1
The film material 14 is driven by the film material drive roller 11 and the film material driven roller 12 and tensioned so that the film material 14 is conveyed without wrinkles or twists. The pressure roller 13 has a rubber elastic layer having a high releasability such as silicon rubber, presses the low heat capacity linear heating element 15 through the film material 14 at a total pressure of 2 to 30 kg, and press-rotates in the arrow direction. By passing the recording material carrying the toner image between the film material 14 and the pressure roller 13, the low heat capacity linear heating element 15 is passed to melt and fix the toner image on the recording material.

In FIG. 2, the impregnating roller 8 extends in the longitudinal direction of the film material 14 as in the case shown in FIG.
It is pressed against the film material driven roller 12 through it and is rotated in the direction of the arrow. In FIG. 2, the film material 14
The fluorine-containing silicone oil is supplied to the surface of the film material 14 from the impregnating roller 8 little by little in accordance with the movement of the film. A film is formed.

Another example of the latter fixing method will be described with reference to FIG. The example of FIG. 3 is an example of a film material having an end, whereas the example of FIG. 2 is an endless film material.

That is, as shown in FIG. 2, the end film material 24 is wound around the sheet feeding shaft 21 and the winding shaft 22, and the film material 24 is gradually moved in the direction of the arrow for each fixing. In this case, the winding shaft 22 drives. 13, 1
5, 16 and 17 are the same as those in FIG.

The feeding shaft 2 is driven by the winding shaft 22.
The edged film material 24 wound around 1 is ejected little by little at each fixing, and the recording material carrying the toner image is passed between the edged film material 24 and the pressure roller 13, and the low heat capacity line The toner image is melted and fixed to the recording material by passing through the heating element 15.

In FIG. 3, an impregnating roller (not shown) impregnated with the fluorine-containing silicone oil of the present invention is brought into pressure contact with the sheet delivery shaft 21 via the end film material 24 to apply the end film material. The fluorine-containing silicone oil coating film of the present invention is formed on the surface of the pressure roller side.

In the illustrated example, a method for forming a fluorine-containing silicone oil coating film using an impregnating roller is disclosed, but a pad, a web or the like impregnated with fluorine-containing silicone oil may be used.

2. Structure of Recording Material The recording material of the present invention is the above-mentioned transfer paper containing calcium carbonate.

The calcium carbonate used in the present invention has a positive electrification property as compared with talc, kaolin and the like, and the positive electrification is calcium carbonate due to friction when the paper is conveyed and frictional electrification with the photoconductor. It is presumed that the paper itself becomes positively charged as an effect. Further, there is no change in chargeability, which is preferable, and it is presumed that calcium carbonate does not contain water of crystallization as compared with talc and kaolin and does not absorb water due to environmental changes.

Although the mechanism by which calcium carbonate generates charging properties is not clear, it is presumed that it is due to mutual friction with the photoconductor or the like or frictional charging between papers. In the present invention, it is necessary that the number average primary particle diameter is 0.1 to 3.0 μm, but since calcium carbonate has high hardness, when calcium carbonate having a number average primary particle diameter of more than 3.0 μm is used, Has a high effect of charging, but has a problem that it easily damages the photoreceptor and causes image defects, and that calcium carbonate having a number average primary particle diameter of less than 0.1 μm lowers the triboelectric charging property. It is presumed that this is because the effect of imparting electrostatic properties is reduced.

The number average primary particle diameter is a value measured with an image analyzer after being magnified 10,000 times by observation with a scanning electron microscope.

The content of calcium carbonate in the transfer paper is
2.0 to 10.0% by weight is preferable. Particularly preferably, it is 3.0 to 8.0%. If the content exceeds 10.0% by weight, the liberation of calcium carbonate becomes excessive, the polishing amount of the photoconductor increases, and the durability deteriorates. On the other hand, if the addition amount is less than 2.0% by weight, the amount attached to the photoconductor is reduced, and the polishing effect of the photoconductor may be reduced.

As calcium carbonate, there are heavy calcium carbonate obtained by crushing ordinary limestone and light calcium carbonate prepared from quicklime and carbon dioxide, but since heavy calcium carbonate has an indefinite shape. Light calcium carbonate is preferable because it easily scratches the photoreceptor. In this case, various particles such as a spindle shape, a needle shape, and a granular shape can be obtained. However, none of them has an irregular shape, which is preferable because no scratch is generated on the photoreceptor.

As the pulp used for constituting the paper, any of pulp obtained from hardwood, pulp obtained from softwood, and waste paper pulp obtained by deinking may be used. However, in order to form a full-color surface image, a paper having a high whiteness can be obtained as a high quality paper, and thus a pulp obtained from hardwood is preferable.

In addition to the above calcium carbonate, known additives are used in the transfer paper.

Examples of the sizing agent added to the paper include alkenyl succinic anhydride, alkyl ketene dimer, fatty acid anhydride, and isocyanate aziridine derivative.

As the physical properties of paper, the surface resistance is 22 ° C./6.
It is preferably set to 1 × 10 ⁹ to 1 × 10 ¹² Ω after standing in a 5% environment (JIS-C-211). The smoothness is preferably 21 seconds to 40 seconds on the surface (wire surface) (JIS-P-8119). The amount of water present in the paper is preferably adjusted to 4.0 to 6.0% in order to reduce the influence of curling (JIS-P-812.
5). Further, the whiteness is preferably 80 to 90% (JIS
-P-8128).

3. Structure of Developer The toner of the present invention is not particularly limited. The volume average particle diameter is preferably 1 to 30 μm, more preferably 5 to
It is 20 μm. The binder resin that constitutes the toner is not particularly limited, and various conventionally known resins can be used. For example, a styrene resin, an acrylic resin, a styrene / acrylic resin, a polyester resin, and the like can be given. The colorant that constitutes the toner is not particularly limited, and various conventionally known materials are used. For example, carbon black,
Nigrosine dye, aniline blue, calcoil blue,
Examples include chrome yellow, ultramarine blue, DuPont oil red, quinoline yellow, methylene blue chloride, phthalocyanine blue, malachite green oxalate, and rose bengal. Examples of other additives include salicylic acid derivatives, charge control agents such as azo metal complexes, and the like. Further, when a magnetic toner is obtained, magnetic particles are added to the colored particles as an additive. The magnetic particles have an average primary particle diameter of 0.1 to 2.
Particles of 0 .mu.m ferrite, magnetite or the like are preferably used. The amount of the magnetic particles added is 20 to 20% of the colored particles.
Preferably, it is 70% by weight.

From the viewpoint of imparting fluidity, inorganic fine particles may be added. As the inorganic fine particles, inorganic oxide particles such as silica, titania, and alumina are preferable, and these inorganic fine particles are preferably subjected to a hydrophobic treatment with a silane coupling agent, a titanium coupling agent, or the like.

The toner is mixed with a carrier and used as a two-component developer or, in the case of a magnetic toner, only the magnetic toner is used as a one-component developer.

As the carrier constituting the two-component developer, either an uncoated carrier composed only of magnetic material particles such as iron or ferrite, or a resin coated carrier in which the magnetic material particle surfaces are coated with a resin or the like is used. Good. The average particle size of the carrier is preferably 30 to 150 μm in volume average particle size.

On the other hand, a release agent may be added. Examples of the releasing agent include low molecular weight polyolefins, fatty acid amides and natural waxes. The addition amount of these is preferably 1 to 5% by weight in the toner.

[0054]

The present invention will be described in detail below with reference to examples, but the embodiments of the present invention are not limited thereto.

Paper Production Example 1 Paper was prepared with the formulations shown in the table below.

[0056]

[Table 1]

[0057]

[Table 2]

(Production Example of Developer) Polyester Resin (PE
S) 100 parts, carbon black 5 parts, and low molecular weight polypropylene 3 parts were added, and the mixture was melted and kneaded, and pulverized and classified to obtain colored particles having a volume average particle diameter of 8.3 μm. Then, 0.8% of hydrophobic silica was added to this product to obtain a toner.

Further, a styrene-acrylic resin-coated ferrite carrier having a volume average particle size of 62 μm was mixed with these toners to prepare a developer having a toner concentration of 7% by weight.

A fixing device having the same outline as that shown in FIG. 1, which is a modified copy machine Konica 3035 manufactured by Konica Corporation, was used as an evaluation machine. Below are the details of the modification related to the fixing conditions.

The evaluation paper was used after being adjusted to A4 size.

Heat roller fixing conditions As a heat roller method, a cylindrical iron having a heating source 4 having a diameter of 30 mm and having a surface 2 coated with a tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer in the central portion is used as the upper roller 1. The diameter of which is 30 m and which is composed of silicone rubber whose surface is also coated with a tetrafluoroethylene-perfluoroalkyl ether copolymer.
It has a lower roller 5 of mφ. Linear pressure is 0.8 kg /
cm, and the width of the nip was 4.3 mm. This fixing device was used to set the printing stroke to 250 mm / sec. As the cleaning mechanism of the fixing device, the impregnating roller 8 impregnated with the fluorine-containing silicone oil exemplified compound of the present invention was attached and used. Using the exemplified compounds (3), (7), (8) and (9), these heat roller fixing devices are designated as R-1, R-2, R-3 and R-4.

As the fixing device, one which can change the surface temperature of the upper roller 1 (110 to 230 ° C.) was used.

Film Fixing Conditions The fixing conditions were set as follows using the endless sheet fixing device (film fixing device) shown in FIG.

Fixing condition: Temperature T1 of heating element 15 = 110
~ 230 ° C Moving speed of film material 14 = 250 mm / sec Layer pressure between heating element 15 and pressure roller 13 = 15 kg Nip between pressure roller 13 and film material 14 = 3 mm Film material 14: Conductive substance dispersed on surface A polyimide film material having a thickness of 15 um and coated with polytetrafluoroethylene was used. As a cleaning mechanism of the fixing device, an impregnating roller 8 impregnated with the following compound of the fluorine-containing silicone oil of the present invention was mounted and used. Exemplified compound (3),
Using (7), (8), and (9), these film fixing devices are designated as F-1, F-2, F-3, and F-4.

On the other hand, as a comparative fixing device, a device in which the above-mentioned impregnating roller 8 is impregnated with silicone oil (dimethyl silicone oil) made of dimethylpolysiloxane,
The impregnation roller 8 was impregnated with a fluorine-based silicone oil (FS-1265: manufactured by Dow Corning Co., Ltd.) in which the side chain alkyl fluoride described in JP-A-52-124338 is simply trifluoromethyl. . The heat roller type fixing device using dimethyl silicone oil has an R-ratio of 1, the film fixing device has an F-ratio of 1, and a fixing device using a fluorine-based silicone oil other than the present invention is R-ratio.
Ratio 2 and F-ratio 2.

(Evaluation) Evaluation of Fixing Rate The fixing rate was 10 ° C. by developing a solid black surface image using the above-mentioned developer and then transferring to the above-mentioned invention and comparative paper.
/ 10% RH environment, fixing temperature 120 in 5 ℃ increments
The fixing was carried out using the above fixing device in which the fixing temperature was changed from ℃ to 200 ℃, and the measurement was carried out. For the measurement, the fixed image was bent, and thereafter, rubbing with a cloth was repeated 10 times using a friction fastness tester, and the reflection density before and after the rubbing was measured with RD-918.
And the fixing ratio was measured from the difference according to the following formula. The initial image density was adjusted to 1.40 by the relative reflection density with the density of the paper being 0, and the measurement was performed.

[0068]

[Equation 1]

When the fixing rate is 70% or more, there is no problem in practical use. Therefore, the surface temperature of the fixing device having this fixing rate was evaluated. The table below shows the temperatures at which a fixing ratio of 70% is obtained. Furthermore, an image with a pixel ratio of 2% is displayed in a low temperature and low humidity environment (10
Printing was performed on 50,000 sheets at (° C./20% RH), and the presence or absence of scratches on the fixing roller or the film was determined. The following table shows the results of visual judgment for the presence of scratches. Those with scratches were evaluated as x, and those without scratches were evaluated as o.

[0070]

[Table 3]

[0071]

[Table 4]

[0072]

The heat fixing method according to the present invention is a heat fixing method using a fluorine-containing silicone oil, and the fixing efficiency of the paper does not deteriorate due to electrostatic repulsion at the fixing section. It also has an excellent effect in that it does not cause the fixing roller and film scratches.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration example of a heat roller fixing method showing an example of the present invention.

FIG. 2 is a diagram showing a schematic configuration example of a heat fixing method of bringing a heating body and a recording material into contact with each other via a film material which is another example of the present invention.

FIG. 3 is a diagram showing a schematic configuration example showing a modification of the heat fixing method shown in FIG.

[Explanation of symbols]

 1 Upper Roller 4 Heating Source 5 Lower Roller 6 Recording Material 8 Impregnation Roller 11 Film Material Drive Roller 12 Film Material Driven Roller 14 Film Material 15 Low Heat Capacity Linear Heating Body

Claims (2)

[Claims] 1. A moving fixing member, a pressure-bonding member for pressing a recording material moving to the fixing member, and the fixing member,
In a thermal fixing method comprising a heating means for thermally melting a toner image on the recording material, the surface of the fixing member in contact with the recording material contains a structural unit represented by the following general formula [I]. A heat fixing method, wherein a fluorine-based silicone oil coating film is formed, and the recording material contains calcium carbonate having a number average primary particle diameter of 0.1 to 3.0 μm. Embedded image [In the formula, X represents a saturated hydrocarbon group having 1 to 4 carbon atoms or an aryl group, R _f represents a fluoroalkyl group having 2 to 10 carbon atoms, and n represents an integer of 1 to 4. ] 2. The heat fixing method according to claim 1, wherein the fixing member is a fixing roller having the heating unit built therein.