JP2001277266A - Method for coating with fluororesin, toner fixing member, toner fixing apparatus and apparatus for electrophotographic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prepare a fluororesin surface layer with excellent surface smoothness by good workability and suppressing generation of wrinkles. SOLUTION: In a smoothing process wherein the fluororesin layer is formed by heating a fluororesin powder layer under a pressurized condition utilizing difference in thermal expansion rates between a base material and a surface transfer member by heating the surface transfer member from the outside by means of an IR heater, a releasing layer consisting of a lubricating liquid is formed between the fluororesin powder layer and the inner surface of the surface transfer member.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for smoothing a surface of a fluororesin-coated roller, and more particularly, to a method for fixing a toner fixing device provided in an electrophotographic apparatus such as a copying machine or a laser beam printer (LBP). The present invention relates to a method for producing a toner fixing member such as a fixing and pressure roller used in a fixing device.

[0002]

2. Description of the Related Art A fixing and pressure roller used as a fixing member of an electrophotographic apparatus is required to have a releasability of a toner, so that a surface layer is often coated with a fluorine resin. As a method of coating the fluororesin on the roller, a method of covering the roller with a fluororesin tube, or a method of coating a fluororesin powder and a fluororesin dispersion liquid on the roller, followed by heating and baking is known. Among these, in the method of heating and firing the fluororesin, the fluororesin is heated to the melting point or higher and fired.

[0003] However, the melt viscosity of the fluororesin is extremely high, and usually the smoothness of the formed fluororesin layer is low. When a low-smooth fluororesin-coated roller is used as a fixing and pressing roller of an electrophotographic apparatus, toner offset to the roller moves and accumulates on the roller, for example,
Problems such as paper wrinkling and paper wrapping around the pressure roller may occur.

In order to suppress the occurrence of such a problem,
Conventionally, as a method of smoothing the surface of a fluororesin layer, for example, a method of polishing a fluororesin layer on a roller surface and then refiring the surface at a temperature slightly higher than the melting point of the fluororesin (Japanese Patent Publication No. 5-55078) ), A method of smoothing the fluororesin layer on the base material by pressing a high-temperature smooth pressing surface (Japanese Patent Application Laid-Open No. 8-118561), and pressing and smoothing the fluororesin layer on the roller surface (mirror surface). And then calcining and melting and bonding to obtain a smooth surface (Japanese Patent Laid-Open No.
JP-A-80277), a method in which a roller coated with a fluororesin is brought into rotational contact with a heating element, and after melting, the roller and the heating element are cooled while rotating to obtain a smooth surface (Japanese Patent Application Laid-Open No. Sho 62-2).
27463) and the like.

Further, the present inventors have provided a fluororesin layer on a cylindrical substrate having an elastic layer, and preliminarily heated and fired the film.
By inserting this into a cylindrical surface transfer member, heating the fluororesin layer, pressing the surface of the fluororesin layer against the inner surface of the surface transfer member by thermal expansion of the elastic layer, and simultaneously bringing the fluororesin layer into a semi-molten state. Proposed a method for transferring the inner shape of a surface transfer member to the surface of a fluororesin layer (Japanese Patent Laid-Open No. 9-2).
No. 77378).

Further, the step of inserting a substrate having a fluororesin powder on the surface into a cylindrical surface transfer member and heating the substrate and the surface transfer member from outside the surface transfer member with an infrared heater. There has been proposed a fluororesin coating method comprising a step of heating a fluororesin powder layer in a pressurized state using a difference in expansion coefficient to form a fluororesin layer (JP-A-11-5059).

However, in the above-described method, since the surface of the fluororesin layer and the inner surface of the cylindrical surface transfer member are firmly adhered to each other, smooth peeling does not occur, and the roller shrinks while being adhered, so that mold release failure occurs. However, it has been sometimes difficult to remove the roller from the cylindrical surface transfer member. Furthermore, wrinkles may occur in the roller axial direction due to the difference in the amount of contraction between the cylindrical surface transfer member and the roller, and even after the wrinkles release the roller from the cylindrical surface transfer member, the wrinkles may remain on the roller surface. In some cases, it remained.

In order to solve the above problems, Japanese Patent Application Laid-Open
No. 2,478,841, an elastic roller covered with a preheated and baked fluororesin layer is inserted into a cylindrical surface transfer member having a smooth inner surface, the surface of the elastic roller is heated, and cooling after the heating is performed. At the time when the surface temperature of the elastic roller in the process is 70 ° C. or higher, the surface smoothing method of the fluororesin-coated elastic roller is characterized in that the inner surface of the cylindrical surface transfer member and the surface of the elastic roller are forcibly peeled off. was suggested.

That is, in the present disclosure, when cooling,
When the roller surface temperature is 70 ° C. or higher, that is, in a state where the elastic layer of the roller is still sufficiently thermally expanded, the cylindrical surface transfer member and the elastic roller are forcibly peeled off. Thereby, the inner surface of the cylindrical surface transfer member (polyimide tube or the like) and the surface of the elastic roller contract while keeping in close contact with each other, thereby solving the problem of wrinkles caused by the difference in the amount of contraction between the two. .

[0010]

However, even with the above coating method, the following problems may occur.

First, even when the temperature of the roller surface is set to 70 ° C. or higher, the inner surface of the surface transfer member and the fluororesin may firmly adhere to each other. In some cases, it was difficult to remove the roller.

That is, since the fluororesin is melted or pressed to the surface transfer member in a state close to the melt, an adhesive force is generated between the two, and the roller is extracted when the temperature of the temporary roller surface is 70 ° C. or more. Even if it did, smooth peeling could not be obtained, and peeling wrinkles might occur on the roller surface.

Second, since the temperature of the roller surface is as high as 70 ° C. or higher, a heat-resistant glove is required for the operation of pulling out the roller, which may result in poor workability and low safety.

Third, when foreign matter adheres to the inner surface of the surface transfer member, the smoothness of the inner surface of the surface transfer member is lost, and the smoothness of the obtained fluororesin layer is sometimes deteriorated. For example, if dust or dirt such as a thermoplastic polymer floating in the air adheres to the inner surface of the surface transfer member during operation, these foreign matters are seized on the inner surface by heating, and are strongly melted. May wear. As a result, even when the inner surface of the surface transfer member is cleaned, it is difficult to remove these foreign substances, and it may be difficult to maintain the cleanliness of the inner surface of the surface transfer member.

In view of the above situation, in the present invention, the inner surface of the surface transfer member is prevented from firmly adhering to the fluororesin, the roller is easily pulled out, and the roller and the surface transfer member contract. An object of the present invention is to suppress wrinkles of a roller due to a difference in the amount and separation at the time of extraction.

Another object of the present invention is to cool the roller until the surface temperature of the roller becomes less than 70 ° C. and to safely and operably extract the roller without using heat-resistant gloves.

Further, foreign matter is prevented from adhering to the inner surface of the surface transfer member, and foreign matter is prevented from seizing on the inner surface of the surface transfer member.
An object is to form a fluororesin layer having excellent surface smoothness while maintaining the cleanliness of the inner surface of the surface transfer member.

[0018]

According to the present invention for achieving the above object, a step of inserting a substrate having a fluororesin powder layer on its surface into a cylindrical surface transfer member, Is heated from the outside with an infrared heater, by utilizing the difference in the coefficient of thermal expansion between the substrate and the surface transfer member, the fluororesin powder layer is heated in a pressurized state, and the fluororesin layer is heated. And forming a smoothing step, wherein a release layer made of a lubricating liquid is formed between the fluororesin powder layer and the inner surface of the surface transfer member. A method for coating a fluororesin is provided.

[0019]

In the present invention, a release layer made of a lubricating liquid is formed between the fluororesin powder layer and the inner surface of the surface transfer member.

As a result, the inner surface of the surface transfer member and the fluororesin are prevented from firmly adhering to each other, so that the roller can be easily pulled out, and the difference in the amount of contraction between the roller and the surface transfer member and the peeling at the time of pulling out can be reduced. The resulting wrinkles of the roller can be suppressed.

Further, the roller is cooled until the surface temperature of the roller becomes less than 70 ° C., and the roller can be extracted safely and with good workability without using heat-resistant gloves or the like.

Further, foreign matter is prevented from adhering to the inner surface of the surface transfer member, and foreign matter is prevented from sticking to the inner surface of the surface transfer member. By maintaining the cleanliness of the inner surface of the member, a fluororesin layer having excellent surface smoothness can be formed.

Therefore, after the smoothing step, the substrate and the surface transfer member can be cooled, and the fluororesin layer can be released from the inner surface of the surface transfer member.

In particular, the substrate and the surface transfer member can be cooled until the temperature of the fluororesin layer becomes lower than 70 ° C.

In the present invention, the release layer made of a lubricating liquid can be formed on the inner surface of the surface transfer member, on the upper side of the fluororesin powder layer, or on both. Further, as a forming method, known means such as spray coating, brush coating, dipping and the like can be used.

Although the amount of the lubricating liquid forming the release layer is not particularly limited, it is preferable that the amount of the lubricating liquid is not more than 0.1 in order to realize a desired release effect.
01mg / cm ² or more is preferred, 0.03 mg / cm ²
The above is more preferable, and the amount is more preferably 0.05 mg / cm ² or more. Also, without causing working on problems such dripping, in order to achieve a good productivity, preferred is 1 mg / cm ² or less, more preferably 0.8 mg / cm ² or less, 0.5 mg / cm ² The following are more preferred.

As the lubricating liquid in the present invention, a liquid mainly composed of silicone oil can be used.

Further, as the lubricating liquid, a liquid obtained by dissolving or uniformly dispersing 10% to 90% by mass of silicone oil with respect to the entire lubricating liquid in a solvent is used.
It is also possible to apply in a diluted state and then volatilize the solvent later.

The solvent is not particularly limited as long as it dissolves or uniformly disperses the silicone oil and volatilizes easily. Toluene, xylene, n-hexane, M
Examples thereof include EK and MIBK, and among them, toluene, xylene, n-hexane and the like are preferable.

Although the molecular weight of the silicone oil to be used is not particularly limited, the viscosity at 25 ° C. is 1 × 10 ⁻⁶ m ² / sec or more in consideration of the handling property of the lubricating liquid and the prevention of dripping. 1 × 10 ^-2 m ² / sec
The following is preferred.

The type of silicone oil used is not particularly limited, but dimethyl silicone oil or phenylmethyl silicone oil is preferred from the viewpoints of heat resistance, chemical stability, availability, and the like. Is preferred. If necessary,
A mixture of dimethyl silicone oil and phenyl methyl silicone oil can be used.

In the present invention, since the inner surface of the surface transfer member is covered with the release layer, foreign substances are prevented from directly adhering to the inner surface. Therefore, even if the inner surface is heated to a high temperature, seizure of the foreign matter and firm fusion are suppressed. As a result, these foreign substances can be removed by a simple cleaning method.

Examples of a simple method for cleaning foreign substances include wiping with a cloth soaked with a solvent such as toluene, scattering with a high-pressure air stream, and the like.

According to the present invention, a fluororesin (FEP, PFA, PTFE, etc.) powder or an aqueous paint thereof is coated on a substrate such as a cylinder or a cylinder to form a fluororesin powder layer, The fluororesin powder layer is heated while being pressurized by utilizing the difference in the coefficient of thermal expansion between the substrate and the surface transfer member between the cylindrical surface transfer member disposed outside the substrate. By heating from the outside of the surface transfer member under pressure using an infrared heater as a heating method, the fluororesin layer of the base material surface can be efficiently heated, and the surface pattern of the surface transfer member is transferred to the surface of the fluororesin layer. It is possible to provide an arbitrary pattern and roughness by doing so.

In the present invention, by heating the fluororesin powder layer under pressure, the heating conditions for forming a crack-free fluororesin layer are relaxed, and the heating from the surface transfer member side is prevented. Accordingly, when there is another polymer layer such as a rubber layer below the fluororesin layer, thermal degradation of the polymer layer can be prevented.

The application of the fluororesin powder to the surface of the substrate may be performed by an electrostatic coating method, but from the viewpoint of easiness, it is preferable to use an aqueous coating containing the fluororesin powder.

It is preferable from the viewpoint of handling that the fluororesin powder on the substrate surface is preheated and fired to be fixed on the substrate surface.

It is preferable that the surface transfer member transmits at least 50% of infrared rays for efficient heating.

Further, the infrared absorptance of the surface transfer member and the release layer is set to be equal to or less than the infrared absorptivity of the fluororesin powder layer, and the infrared absorptivity of the substrate surface is made larger than the infrared absorptivity of the fluororesin powder layer. Thereby, the fluororesin powder layer can be selectively heated, and thermal deterioration of the surface transfer member, the release layer, the substrate, and the like is suppressed, which is preferable.

That is, in terms of efficiently heating the fluororesin powder layer with infrared rays, the infrared absorption is such that the surface transfer member ≦ the fluororesin layer <the base layer surface, and the release layer ≦ the fluororesin layer. Is preferred.

The cylindrical or columnar substrate in the present invention is not particularly limited, but a metal core such as iron or aluminum; and a heat resistant rubber such as silicone rubber or fluoro rubber formed on the metal core. A multi-layered base material or the like may be used. These are particularly preferable as a base material of a toner fixing member such as a fixing roller and a pressure roller.

The actual structure of the base material (base layer) is described in detail in the examples and drawings described later. For example, (a) core metal / fluororesin primer layer (a) core metal / silicone rubber primer layer / silicone rubber・ Fluoro rubber / fluoro resin layer (c) polyimide film ・ Silicone rubber primer layer ・ Silicone rubber ・ Fluoro rubber / fluoro resin layer

As the fluororesin used in the present invention, commercially available perfluoroethylene propylene resin (FEP),
Perfluoroalkoxy resin (PFA), polytetrafluoroethylene resin (PTFE) and the like are used.

The material of the surface transfer member is not particularly limited as long as it can withstand the required temperature at the time of firing and forming the fluororesin powder. Metal materials such as iron, SUS and aluminum; polyimides and polyphenylene sulfide; It is preferable to use a heat-resistant resin, glass, or the like. Specific examples of the surface transfer member include a polyimide thin-layer tube, a Ni electroformed film, and a glass tube. These are easy to handle, and have excellent heat resistance and strength at high temperatures, so that they can be used repeatedly. Is preferable.

The shape of the surface transfer member is cylindrical, and the inner diameter is slightly larger than the outer diameter of the cylindrical or columnar member having the fluororesin layer formed on the substrate, and the length is at least the same. It is necessary. The gap formed between the two is preferably as narrow as possible, although it depends on the difference in the coefficient of thermal expansion during heating in the combination of the two, and is usually 5 to 10
00 μm.

The inner surface finish of the surface transfer member is as follows: (a) When the inner surface is formed by drilling, lathing, or the like in the case of a metal member made by removal processing, the surface is finished to a desired surface roughness by honing. . If roughening is desired, blasting after honing is performed.

(A) In the case of a product (metal electroforming, resin) produced by additional processing, a master rod of a transfer member is prepared and a metal,
The resin is formed and used after being removed from the master, but the surface of the master may be finished to a desired surface roughness by cutting, polishing, polishing or the like. If the surface of the master is roughened or patterned by blasting or etching, it can be transferred to the inner surface of the surface transfer member.

The infrared heater for inserting the base material coated with the fluororesin powder into the above-mentioned surface transfer member and heating the integrated one is not particularly limited. Using a parallel light type line heater having a length of, the surface transfer member is heated while rotating the surface transfer member while keeping both axes parallel and at an appropriate distance. The output and distance of the heater may be appropriately determined so that the heating time is several minutes to several tens of minutes and the heater is uniformly heated. The temperature of the fluororesin layer at the time of heating is the melting temperature of the fluororesin to be used and varies depending on the fluororesin to be used, but is usually about 280 to 320 ° C.

The above operation may be performed after the fluorine resin powder layer is preliminarily heated and fired to form a film. The preheating and calcination of the fluororesin may be performed until the fluororesin is completely formed, but it is not particularly necessary, and it is sufficient to temporarily raise the melting temperature of the fluororesin. At this time, cracks and irregularities may be present on the surface of the fluororesin. Further, the temperature of the fluororesin layer in the step of heating the fluororesin-coated base material and the surface transfer body after the preliminary heating and firing is 2
There is no particular limitation as long as the temperature is 00 ° C. or higher, but it is not necessary to raise the temperature to the melting temperature. By using this method, an arbitrary surface pattern can be imparted to the fluororesin with a smaller amount of heat than when preheating and firing are not performed. When a non-heat-resistant material such as resin or rubber is used as the base material, the heat deterioration of the base material occurs when the fluororesin is heated and fired. Can be prevented.

When the coefficient of thermal expansion of the fluororesin-coated base material is greater than the coefficient of thermal expansion of the surface transfer member, the fluororesin-coated base material is inserted into the surface transfer member, and an infrared heater is used. When heated from outside,
Since the thermal expansion of the substrate is greater than the thermal expansion of the surface transfer member, the fluororesin layer is pressed between the substrate and the surface transfer member, and the inner surface pattern of the surface transfer member is transferred to the fluororesin surface.

When the coefficient of thermal expansion of the substrate coated with the fluororesin is smaller than the coefficient of thermal expansion of the surface transfer member,
The fluororesin-coated base material is inserted into the surface transfer member having the fixed outer surface and heated from outside the surface transfer member using an infrared heater. The layer is pressed, and the inner surface pattern of the surface transfer member is transferred to the surface of the fluororesin.

In any of the above-mentioned methods, the base material may have a multilayer structure, and the surface layer of the base material may be made of a heat-resistant rubber.

When the fluororesin is pressurized and formed between the surface transfer members by heating from the outside of the surface transfer member using an infrared heater, the fluororesin film formation can be performed even when the temperature applied during the firing and film formation of the fluororesin is set low. Can be easily performed, the fluororesin on the surface can be directly heated, and rapid heating can be performed, so that deterioration of the base material can be suppressed.
In this case, the inner surface of the surface transfer member can be transferred to the surface of the fluororesin, and a desired pattern can be formed on the surface of the fluororesin. Further, the surface transfer member emits 50 infrared rays.
% Of the material is not absorbed by the surface transfer member itself, but its energy reaches the fluororesin and the thermal expansion of the surface transfer member is reduced. Transfer can be performed, and a desired pattern can be formed on the fluororesin surface. That is, thermal degradation of the base layer can be further suppressed.

Further, by cooling the inner surface of the base material before or during the smoothing step and / or during the smoothing step, thermal deterioration of the base layer can be further suppressed.

The toner fixing member used in the electrophotographic image forming apparatus is required to have a toner releasing property in terms of its function.
Among the toner fixing members, in particular, a fixing roller that comes into contact with the toner is required to have a smooth surface layer fluororesin in order to prevent uneven gloss of a printed image. The gloss unevenness of the printed image is caused by the transfer of the surface pattern of the surface fluororesin of the fixing roller to the surface of the toner image, and is remarkable when a solid image, especially a color image of photographic printing is printed. According to the studies by the inventors, the gloss unevenness of the printed image depends on the surface roughness of the fixing roller, and the surface roughness of the surface fluororesin of the fixing roller is sufficiently reduced by a ten-point average roughness (Rz). Can be prevented.

In view of the above, in the present invention,
The ten-point average surface roughness (Rz) of the fluororesin layer is 20 μm
Or less, more preferably 15 μm or less, and 10 μm or less.
m or less is more preferable.

As for the pressure roller, the ten-point average surface roughness (Rz) of the fluororesin layer is preferably 0.1 μm or more, in order to realize good transferability of the transfer material, and is preferably 1 μm or more.
m or more is more preferable.

Further, using the method of the present invention, a fluororesin is coated on a roller, and the fluororesin is pressed by the surface transfer member while heating the fluororesin from outside the surface transfer member using an infrared heater. For fluoroplastics,
It is also possible to form a desired pattern such as a scale and a serial number.

As described above, since the surface layer of the fluororesin produced by the method of the present invention has excellent characteristics, it can be applied to a toner fixing member such as a fixing roller or a pressure roller.
Particularly preferred.

Therefore, by arranging the toner fixing member manufactured by the method of the present invention, a toner fixing device having excellent performance can be manufactured.

Such a toner fixing device can be suitably used in an electrophotographic apparatus.

As an electrophotographic apparatus to which the toner fixing member according to the present invention is applied, a photosensitive member, a latent image forming unit, a unit for developing the formed latent image with toner, a unit for transferring the developed toner image to a transfer material, and And an electrophotographic apparatus having means for fixing a toner image on a transfer material. An example of this device is shown in FIG.

Reference numeral 5 denotes a photoreceptor, which is driven to rotate at a predetermined peripheral speed in the direction of an arrow around a shaft 5a.

The photosensitive member 5 is uniformly charged with a predetermined positive or negative potential on its peripheral surface by the charging means 6 during its rotation.
Next, the light-emitting section 7 receives light image exposure L (slit exposure or laser beam scanning exposure) by an image exposure means (not shown). As a result, an electrostatic latent image corresponding to the image exposure is sequentially formed on the peripheral surface of the photoconductor.

The electrostatic latent image is then developed with toner by developing means 8, and the developed toner image is transferred by a transfer means 9 from a paper feeding unit (not shown) to the photosensitive body 5.
Are sequentially transferred onto the surface of the transferred transfer material P fed in synchronization with the rotation of. The transfer material P having undergone the image transfer is separated from the photoreceptor surface, introduced into an image fixing means (toner fixing device) 2, subjected to image fixing, and printed out of the apparatus as a copy. The surface of the photoreceptor 5 after the image transfer is cleaned and cleaned by removing the untransferred toner by the cleaning unit 3, is subjected to a charge removal process by the pre-exposure unit 1, and is repeatedly used for image formation. As the uniform charging means 6 for the photoconductor, a corona charging device or a direct charging device using a conductive roller is used. The transfer device 9 also uses a corona transfer unit and a direct charging unit using a conductive roller.

[0066]

The present invention will be described in more detail with reference to the following Examples, which do not limit the present invention in any way.

The lubricating liquid forming the release layer is
Has a viscosity of 1 × 10 at 25 ° C.^-Fourm ^Two/ Sec
Methyl silicone oil KF-96 (Shin-Etsu Chemical Co., Ltd.
(Manufactured by a company).

Further, the ten-point average roughness (Rz) is determined according to JIS.
B 0601 Surfcom 4 manufactured by Tokyo Seimitsu Co., Ltd.
It measured using 80A.

Example 1 Production of Roller 1 A first example of the present invention will be described with reference to FIG.

Reference numeral 11 denotes a cylindrical substrate having a fluororesin coating on the outermost layer, and its cross-sectional view is shown in FIG. Reference numeral 111 denotes a core metal of a cylindrical substrate, which is made of aluminum and has an outer diameter of 40 mm. On the core bar 111,
A fluororesin primer layer 112 is formed for bonding the surface fluororesin and the core metal, and a fluororesin coating layer 113 is formed thereon. Primer layer 112
Was formed by applying an aqueous paint of a fluororesin primer by spraying and drying it at 150 ° C. for 30 minutes, at which time its thickness was 8 μm. After the above-described primer layer coating was completed, a fluororesin (PFA) dispersion was applied by spraying and dried at 150 ° C. for 30 minutes. Its thickness was 25 μm.

As the PFA dispersion, NEOFLON PFA dispersion AD-2CR manufactured by Daikin Industries, Ltd. was used.

Reference numeral 12 denotes a surface transfer member having an inner diameter of 40.1 m.
m, having a cylindrical shape with a wall thickness of 0.05 mm. On the inner surface of the surface transfer member, a surface pattern to be transferred to the fluororesin film coated on the base material is formed. In this embodiment, the inner surface of the surface transfer member was processed so that the surface roughness Rz was 5 μm. In this embodiment, as the material of the surface transfer member 12, a Ni electroformed film having a smaller coefficient of thermal expansion than the base material 11 was used.

First, dimethyl silicone oil was diluted with toluene so as to have a concentration of 50% by mass, and this was applied to the inner surface of the surface transfer member by spraying, and dried at 50 ° C. for 5 minutes to form a release layer. The application amount is about 0.1mg /
cm ² .

Thereafter, the fluororesin-coated base material 11 was inserted into the inside of the surface transfer member 12, and further fixed and integrated by a fixing member (not shown) so that the center lines of the base material and the surface transfer member coincided with each other. . At this time, the distance between the fluororesin-coated base material 11 and the surface transfer member 12 is approximately 2
There is a gap of 0 μm. The substrate 11 and the surface transfer member 12 coated with the fluororesin, integrated as described above,
Heat was applied from the outside of the surface transfer member 12 by the infrared heater 18. In this embodiment, the length (300 m
m), an infrared line heater (parallel light type) having a 3 kW output was disposed at a distance of about 50 mm from the surface of the surface transfer member. In this state, heating was performed at 3 kW for about 10 minutes. At that time, since the thermal expansion of the aluminum constituting the base material is larger than the Ni constituting the surface transfer member, the aluminum expands more and fills the gap of about 20 μm between the surface transfer member and the base material,
A state in which the fluororesin layer was pressed was created. Further, the fluororesin (PFA) on the surface layer of the base material was softened by infrared heating, and a film was formed and smoothed. After the above process, the substrate and the surface transfer member were cooled, and the substrate was extracted from the surface transfer member.

Despite cooling the roller surface temperature to less than 70 ° C., the inner surface of the surface transfer member does not firmly adhere to the fluororesin, and the roller can be extracted safely and easily. did it. In addition, there was no case where the wrinkles of the roller were generated due to the difference in the amount of contraction between the roller and the surface transfer member or the separation at the time of extraction.

The surface roughness of the calcined film of the fluororesin thus obtained is 5.2 μm in ten-point average roughness (Rz), and the surface pattern of the surface transfer member is transferred to the fluororesin surface. And a fluororesin was formed. In addition, when the surface of the formed fluororesin layer was observed with an electron microscope, no defects such as cracks were observed on the surface. In addition, processing could be performed in a much shorter time than heating in an oven (about 20 minutes).

(Embodiment 2) Fabrication of Roller 2 A second embodiment of the present invention will be described with reference to FIG.

Reference numeral 21 denotes a cylindrical substrate having a fluororesin coating on the outermost layer, and its cross-sectional view is shown in FIG. Reference numeral 211 denotes a core metal of a cylindrical substrate, which is made of aluminum and has an outer diameter of 40 mm. On the core metal 211, a fluororesin primer layer 212 is formed for bonding the surface fluororesin to the core metal, and a fluororesin coating layer 213 is formed thereon. Primer layer 2
No. 12 was formed by applying an aqueous paint of a fluororesin primer by spraying and then drying it at 150 ° C. for 30 minutes, at which time its thickness was 8 μm. After the above-described primer layer coating is completed, the fluororesin coating layer is spray-coated with a fluororesin (PFA) dispersion, dried at 150 ° C. for 30 minutes, and then dried.
It was preheated and baked at 0 ° C. for 20 minutes, and its thickness was 25 μm. At this time, the fluororesin layer was not completely formed, and defects such as cracks and irregularities were observed on the surface, and the surface roughness was 15 μm as a ten-point average roughness (Rz).

As the PFA dispersion, NEOFLON PFA dispersion AD-2CR manufactured by Daikin Industries, Ltd. was used.

Reference numeral 22 denotes a surface transfer member having an inner diameter of 40.1 m.
m, having a cylindrical shape with a wall thickness of 0.05 mm. On the inner surface of the surface transfer member, a surface pattern to be transferred to the fluororesin film coated on the base material is formed. In this embodiment, the inner surface of the surface transfer member was processed to have a surface roughness of 5 μm. As the material of the surface transfer member 22, a Ni electroformed film having a smaller coefficient of thermal expansion than the base material 21 was used.

First, dimethyl silicone oil was diluted with toluene so as to have a concentration of 50% by mass, and this was applied to the inner surface of the surface transfer member by spraying, and dried at 50 ° C. for 5 minutes to form a release layer. The application amount is about 0.1mg /
cm ² .

Thereafter, the substrate 21 pre-heated and fired of the fluororesin is inserted into the inside of the surface transfer member 22, and further fixed by a fixing member (not shown) so that the center lines of the substrate and the surface transfer member coincide. And integrated. At that time, between the substrate 21 coated with the fluororesin and the surface transfer member 22,
There is a gap of about 20 μm. Heat was applied from the outside of the surface transfer member 22 by the infrared heater 28 of the surface transfer member 22 and the substrate 21 pre-heated and baked with the fluorine resin coating and the fluorine resin integrated as described above. In this embodiment, a 3 kW output infrared line heater (parallel light type) having a length (300 mm) substantially equal to that of the base material is arranged at a distance of about 50 mm from the surface of the surface transfer member. In this state, heating was performed at 3 kW for about 8 minutes. At this time, since the thermal expansion of the aluminum constituting the base material is larger than that of the Ni constituting the surface transfer member, the aluminum expands more and about 2 mm between the surface transfer member and the base material.
A state where the gap of 0 μm was filled and the fluororesin layer was further pressed was created. Further, the fluororesin (PFA) on the surface layer of the base material was softened by infrared heating, and a film was formed and smoothed. After the above process, the substrate and the surface transfer member are cooled,
The substrate was released from the surface transfer member.

Although the surface temperature of the roller is cooled to less than 70 ° C., the inner surface of the surface transfer member does not firmly adhere to the fluororesin, and the roller can be safely and easily extracted. did it. In addition, there was no case where the wrinkles of the roller were generated due to the difference in the amount of contraction between the roller and the surface transfer member or the separation at the time of extraction.

The surface roughness of the baked fluororesin film thus obtained is 5.5 μm in ten-point average roughness (Rz), and the surface pattern of the surface transfer member is transferred to the fluororesin surface. And a fluororesin was formed. In addition, when the surface of the formed fluororesin layer was observed with an electron microscope, no defects such as cracks were observed on the surface. Processing could be performed in a much shorter time than heating in an oven (about 20 minutes).

Example 3 Production of Roller 3 A third example of the present invention will be described with reference to FIG.

Reference numeral 31 denotes a cylindrical substrate having a fluororesin coating on the outermost layer, and a cross-sectional view thereof is shown in FIG. Reference numeral 311 denotes a core metal of a cylindrical substrate, which is made of SUS and has an outer diameter of 40 mm. The silicone rubber layer 31 of the LTV is provided on the core metal 311 via the primer layer 312.
3 is bonded and its thickness is 1 mm. The silicone rubber layer was formed by inserting a core coated with a primer into a cylindrical mold, injecting unvulcanized silicone rubber of LTV, and heating and curing it. 314 is a primer layer for bonding the silicone rubber layer 313 and the surface fluororesin layer, and is composed of fluororubber and fluororesin (FE).
P). The primer layer 314 is obtained by applying an aqueous paint (GLS-213 manufactured by Daikin Industries, Ltd.) composed of a mixture of a fluororubber and a fluororesin by spraying and heating and curing at 200 ° C. for 30 minutes.
Its thickness was 25 μm. The above primer layer 314
A fluorine resin (FEP) layer 315 is formed thereon. The fluororesin layer 315 was formed by spraying a dispersion of fluororesin (FEP) by spraying, drying at 150 ° C. for 20 minutes, and preheating and firing at 300 ° C. for 20 minutes, and had a thickness of 15 μm. At that time, the fluororesin layer was not completely formed, and defects such as cracks and irregularities were observed on the surface. The surface roughness of the fluororesin surface was 15 μm in terms of ten-point average roughness (Rz).

As the FEP dispersion, NEOFLON FEP dispersion ND-1 manufactured by Daikin Industries, Ltd. was used.

Reference numeral 32 denotes a surface transfer member having an inner diameter of 42.2 m.
m, having a cylindrical shape with a wall thickness of 0.05 mm. On the inner surface of the surface transfer member, a surface pattern to be transferred to the fluororesin film coated on the base material is formed. In this embodiment, the inner surface of the surface transfer member was processed to have a surface roughness of 5 μm. As the material of the surface transfer member 32, a Ni electroformed film was used.

First, dimethyl silicone oil was diluted with toluene so as to have a concentration of 50% by mass, and this was applied to the inner surface of the surface transfer member by spraying, and dried at 50 ° C. for 5 minutes to form a release layer. The application amount is about 0.2mg /
cm ² .

Thereafter, the base material 31 pre-heated and baked of the fluororesin is inserted into the inside of the surface transfer member 32, and further fixed by a fixing member (not shown) so that the center lines of the base material and the surface transfer member coincide. And integrated. At that time, between the fluororesin-coated base material 31 and the surface transfer member 32,
There is a gap of about 60 μm. Heat was applied from the outside of the surface transfer member 32 by the infrared heater 38 of the surface transfer member 32 and the substrate 31 preliminarily heated and baked with the fluorine resin coating and the fluorine resin integrated as described above. In this embodiment, a 3 kW output infrared line heater (parallel light type) having a length (300 mm) substantially equal to that of the base material is arranged at a distance of about 50 mm from the surface of the surface transfer member. In this state, about 6 at 3 kW
Heated for minutes. At this time, since the thermal expansion of the silicone rubber forming the base material is larger than that of Ni forming the surface transfer member, the silicone rubber expands more and fills a gap of about 60 μm between the surface transfer member and the base material. Then, a state in which the fluororesin layer was pressed was created. Further, the fluororesin (FEP) on the surface layer of the base material was softened by infrared heating, and a film was formed and smoothed. After the above process, the substrate and the surface transfer member were cooled, and the substrate was extracted from the surface transfer member.

In spite of the fact that the surface temperature of the roller is cooled to less than 70 ° C., the inner surface of the surface transfer member does not firmly adhere to the fluororesin, and the roller can be safely and easily extracted. did it. In addition, there was no case where the wrinkles of the roller were generated due to the difference in the amount of contraction between the roller and the surface transfer member or the separation at the time of extraction.

The surface roughness of the calcined film of the fluororesin thus obtained was 4.9 μm in terms of ten-point average roughness (Rz), and the surface pattern of the surface transfer member was transferred to the fluororesin surface. And a fluororesin was formed. In addition, when the surface of the formed fluororesin layer was observed with an electron microscope, no defects such as cracks were observed on the surface. Processing could be performed in a much shorter time than heating in an oven (about 20 minutes).

Example 4 Production of Roller 4 A fourth example of the present invention will be described with reference to FIG.

Reference numeral 41 denotes a cylindrical substrate having a fluororesin coating on the outermost layer, and its cross-sectional view is shown in FIG. Reference numeral 411 denotes a core metal of a cylindrical base material, which is made of SUS and has an outer diameter of 40 mm. The LTV silicone rubber layer 41 is provided on the core metal 411 via the primer layer 412.
3 is bonded and its thickness is 1 mm. The silicone rubber layer was formed by inserting a core coated with a primer into a cylindrical mold, injecting unvulcanized silicone rubber of LTV, and heating and curing it. Reference numeral 414 denotes a primer layer for bonding the silicone rubber layer 413 and the surface fluororesin layer, and comprises a fluororubber and a fluororesin (FE).
P). The primer layer 414 is obtained by applying an aqueous paint (GLS-213 manufactured by Daikin Industries, Ltd.) composed of a mixture of a fluororubber and a fluororesin by spraying and heating and curing at 200 ° C. for 30 minutes.
Its thickness was 25 μm. The primer layer 414
A fluorine resin (FEP) layer 415 is formed thereon. The fluororesin layer 415 was formed by spraying a dispersion of fluororesin (FEP) by spraying, drying at 150 ° C. for 20 minutes, and then preheating and firing at 300 ° C. for 20 minutes, and had a thickness of 15 μm. At that time, the fluororesin layer was not completely formed, and defects such as cracks and irregularities were observed on the surface. The surface roughness of the fluororesin surface was 15 μm in terms of ten-point average roughness (Rz).

As the FEP dispersion, NEOFLON FEP dispersion ND-1 manufactured by Daikin Industries, Ltd. was used.

Reference numeral 42 denotes a surface transfer member having an inner diameter of 42.2 m.
m, 1 mm thick. In this embodiment, the surface transfer member 42 is made of heat-resistant glass. On the inner surface of the surface transfer member, a surface pattern to be transferred to the fluororesin film coated on the base material is formed. In this embodiment, the inner surface of the surface transfer member had a surface roughness of 5 μm.

This heat resistant glass has an infrared transmittance of 90%.
As described above, the infrared transmittance of FEP which is a fluororesin is also about 90%. In addition, a fluoro rubber and a fluoro resin (F
EP), which has an infrared transmittance of 1
0% or less. The infrared transmittance of the release layer used in this example was 90% or more.

First, dimethyl silicone oil was diluted with toluene so as to have a concentration of 50% by mass, and this was applied to the inner surface of the surface transfer member by spraying, and dried at 50 ° C. for 5 minutes to form a release layer. The application amount is about 0.1mg /
cm ² .

Then, the base material 41 pre-heated and baked with the fluororesin coating and the fluororesin is transferred to the surface transfer member 4.
2 and further fixed and integrated with a fixing member (not shown) so that the center line of the substrate and the surface transfer member coincide with each other. At this time, the base material 41 coated with a fluororesin
There is a gap of about 60 μm between the surface transfer member 42 and the surface transfer member 42.
Heat was applied from the outside of the surface transfer member 42 by the infrared heater 48 of the surface transfer member 42 and the substrate 41 preliminarily heated and baked with the fluorine resin coating and the fluorine resin integrated as described above. In the present embodiment, the length (30
0 mm) and a 3 kW output infrared line heater (parallel light type) was disposed at a distance of about 50 mm from the surface transfer member surface. In this state, heating was performed at 3 kW for about 3 minutes. The thermal expansion of the silicone rubber forming the base material is larger than that of the heat-resistant glass forming the surface transfer member, and the surface transfer member (heat-resistant glass) and the fluororesin do not absorb much infrared rays, so the thermal expansion is less and the fusion interface is selective. Is heated, the silicone rubber expands more, the gap of about 60 μm between the surface transfer member and the base material is filled, and the state in which the fluororesin layer is pressed is efficiently created with low energy. Was completed. Further, the fluororesin (FEP) on the surface layer of the base material was softened by infrared heating, and a film was formed and smoothed. After the above process, the substrate and the surface transfer member were cooled, and the substrate was extracted from the surface transfer member.

In spite of the fact that the surface temperature of the roller is cooled to less than 70 ° C., the inner surface of the surface transfer member does not firmly adhere to the fluororesin, and the roller can be safely and easily extracted. did it. In addition, there was no case where the wrinkles of the roller were generated due to the difference in the amount of contraction between the roller and the surface transfer member or the separation at the time of extraction.

The surface roughness of the calcined film of the fluororesin thus obtained is 4.9 μm in ten-point average roughness (Rz), and the surface pattern of the surface transfer member is transferred to the fluororesin surface. And a fluororesin was formed. In addition, when the surface of the formed fluororesin layer was observed with an electron microscope, no defects such as cracks were observed on the surface. As a result, processing was completed in a shorter time than the production of the roller 3. Further, thermal degradation of the silicone rubber could be suppressed.

(Embodiment 5) Fabrication of Roller 5 A fifth embodiment of the present invention will be described with reference to FIG.

Reference numeral 51 denotes a cylindrical base material having a fluororesin in the outermost layer, and its sectional view is shown in FIG. Reference numeral 511 denotes a core metal of a cylindrical base material, which is made of SUS and has an outer diameter of 40 mm. A primer layer 512 is provided on the core metal 511.
The silicone rubber layer 513 of the LTV is adhered through the substrate and has a thickness of 1 mm. The above silicone rubber layer is obtained by inserting a core coated with a primer into a cylindrical mold,
V was formed by injecting an unvulcanized silicone rubber and curing it by heating. 514 is a silicone rubber layer 51
3 and a primer layer for bonding the surface fluororesin layer, and is composed of a mixture of fluororubber and fluororesin (FEP). The primer layer 514 is made of a water-based paint (Daikin Industries G) made of a mixture of fluoro rubber and fluoro resin.
LS-213) by spraying and spraying at 200 ° C for 30
It is obtained by heating and curing for 25 minutes, and its thickness is 25 μm
Met. On the primer layer 514, a fluororesin (FEP) layer 515 is formed. Fluororesin layer 5
15 is a fluororesin (FEP) dispersion applied by spraying, dried at 150 ° C. for 20 minutes, and then 300 ° C.
Pre-baked for 20 minutes at a thickness of 15μ
m. At that time, the fluororesin layer was not completely formed, and defects such as cracks and irregularities were observed on the surface. The surface roughness of the fluororesin surface was 15 μm in terms of ten-point average roughness (Rz).

As the FEP dispersion, NEOFLON FEP dispersion ND-1 manufactured by Daikin Industries, Ltd. was used.

Reference numeral 52 denotes a surface transfer member having an inner diameter of 42.2 m.
m, having a cylindrical shape with a wall thickness of 0.05 mm. In this embodiment, a polyimide tube is used as the material of the surface transfer member 52. On the inner surface of the surface transfer member, a surface pattern to be transferred to the fluororesin film coated on the base material is formed. In this embodiment, the inner surface of the surface transfer member had a surface roughness of 5 μm.

The infrared transmittance of this polyimide is about 90.
%, And the infrared transmittance of the fluororesin (FEP) is also about 90%. In addition, a fluororubber and a fluororesin (FE) were used as primers at the fusion interface used in this example.
P), which has an infrared transmittance of 10
% Or less. The infrared transmittance of the release layer used in this example was 90% or more.

First, dimethyl silicone oil was diluted with toluene so as to have a concentration of 50% by mass, and this was applied to the inner surface of the surface transfer member by spraying and dried at 50 ° C. for 5 minutes to form a release layer. The application amount is about 0.1mg /
cm ² .

Thereafter, the base material 51 pre-heated and fired of the fluororesin is inserted into the inside of the surface transfer member 52, and further fixed by a fixing member (not shown) so that the center lines of the base material and the surface transfer member coincide. And integrated. At that time, between the substrate 51 coated with the fluororesin and the surface transfer member 52,
There is a gap of about 60 μm. Heat was applied from the outside of the surface transfer member 52 by the infrared heater 58 of the surface transfer member 52 and the substrate 51 preliminarily heated and baked with the fluorine resin coating and the fluorine resin integrated as described above. In this embodiment, a 3 kW output infrared line heater (parallel light type) having a length (300 mm) substantially equal to that of the base material is arranged at a distance of about 50 mm from the surface of the surface transfer member. In this state, heating was performed at 3 kW for about 3 minutes. In this case, the thermal expansion of the silicone rubber constituting the base material is larger than that of the polyimide constituting the surface transfer member, and the surface transfer member (polyimide) and the fluororesin do not absorb much infrared rays, so that the thermal expansion is further reduced and the fusion interface is selectively performed. Is heated, so that a gap of about 60 μm between the surface transfer member and the base material is filled, and a state in which the fluororesin layer is pressed can be efficiently created with low energy. Further, the fluororesin (FEP) on the surface layer of the base material was softened by infrared heating, and a film was formed and smoothed. After the above process, the substrate and the surface transfer member were cooled, and the substrate was extracted from the surface transfer member.

Although the surface temperature of the roller is cooled to less than 70 ° C., the inner surface of the surface transfer member does not adhere firmly to the fluororesin, and the roller can be extracted safely and easily. did it. In addition, there was no case where the wrinkles of the roller were generated due to the difference in the amount of contraction between the roller and the surface transfer member or the separation at the time of extraction.

The surface roughness of the baked fluororesin film thus obtained was 4.9 μm in terms of ten-point average roughness (Rz), and the surface pattern of the surface transfer member was transferred to the fluororesin surface. And a fluororesin was formed. In addition, when the surface of the formed fluororesin layer was observed with an electron microscope, no defects such as cracks were observed on the surface. Further, thermal degradation of the silicone rubber could be suppressed.

The polyimide film can be easily prepared by preparing a master having high accuracy and desired surface accuracy, coating, curing and peeling the master.
In addition, since it has excellent strength at high temperatures, the durability of repeated use as a surface transfer member can be improved. Furthermore, since it has flexibility, it is easy to handle and has excellent mass productivity.

(Embodiment 6) Production of Roller 6 A sixth embodiment of the present invention will be described with reference to FIG.

When processing under the same conditions as in the case of the roller 5, from 5 minutes before irradiation with infrared rays to 5 minutes after irradiation.
Cooling air 69 at −10 ° C. was flowed at a flow rate of 1 liter per minute through the hollow portion of the cored bar. As a result, it was possible to cool the substrate and the surface transfer member, which took about 10 minutes after heating, and to reduce the time until the substrate was released from the surface transfer member. Further, even when the output of infrared radiation was 3.5 kW and two and a half minutes, a baked film of the same fluororesin as before was obtained. The surface roughness was 4.9 μm in ten-point average roughness (Rz). The surface pattern of the surface transfer member was transferred to the surface of the fluororesin, and the fluororesin was formed into a film and smoothed. Also,
When the surface of the formed fluororesin layer was observed with an electron microscope, no defects such as cracks were observed on the surface.

Although the surface temperature of the roller is cooled to less than 70 ° C., the inner surface of the surface transfer member does not adhere firmly to the fluororesin, and the roller can be safely and easily extracted. did it. In addition, there was no case where the wrinkles of the roller were generated due to the difference in the amount of contraction between the roller and the surface transfer member or the separation at the time of extraction. In addition, thermal degradation of the silicone rubber could be suppressed.

(Embodiment 7) Production of Roller 7 A seventh embodiment of the present invention will be described with reference to FIG.

Reference numeral 71 denotes a cylindrical substrate having a fluororesin coating layer as the outermost layer, and its cross-sectional view is shown in FIG. 711 has a thickness of 50 μm for forming a base layer of a cylindrical base material.
m, a thermosetting polyimide film with an outer diameter of 4
0 mm. An LTV silicone rubber layer 713 is provided on the polyimide film 711 via a primer layer 712.
Are adhered and the thickness is 300 μm. The silicone rubber layer was formed by spray-coating unvulcanized LTV silicone rubber dissolved in toluene on a primer-coated polyimide film and heating and curing it. Reference numeral 714 denotes a primer layer for bonding the silicone rubber layer 713 and the surface fluororesin layer, and is composed of a mixture of fluororubber and FEP fluororesin.
On the primer layer 714, a fluororesin (FEP) layer 715 is formed. The fluororesin layer 715 was formed by spraying a dispersion of fluororesin (FEP) by spraying, drying at 150 ° C. for 20 minutes, and pre-baking at 300 ° C. for 20 minutes, and had a thickness of 15 μm. At that time, the fluororesin layer was not completely formed, and defects such as cracks and irregularities were observed on the surface. The surface roughness of the fluororesin surface is 15 μm in ten-point average roughness (Rz).
Met.

As the FEP dispersion, NEOFLON FEP dispersion ND-1 manufactured by Daikin Industries, Ltd. was used.

Reference numeral 72 denotes a surface transfer member having an inner diameter of 42.8 m.
m, having a cylindrical shape with a wall thickness of 0.05 mm. On the inner surface of the surface transfer member, a surface pattern to be transferred to the fluororesin film coated on the base material is formed. In this embodiment, the inner surface of the surface transfer member was processed to have a surface roughness of 5 μm. A polyimide tube was used as the material of the surface transfer member 72.

First, dimethyl silicone oil was diluted with toluene so as to have a concentration of 50% by mass, this was applied to the inner surface of the surface transfer member by spraying, and dried at 50 ° C. for 5 minutes to form a release layer. The application amount is about 0.1mg /
cm ² .

Thereafter, a cylindrical inner surface fixing jig 73 (made of aluminum) having an outer diameter equal to the inner diameter of the film is inserted into the fluororesin base material 71 preliminarily heated and baked, and integrated therewith. The substrate was inserted and further fixed and integrated with a fixing member (not shown) so that the center line of the substrate and the surface transfer member coincided, and the center line of the substrate and the surface transfer member also coincided.
At that time, there was a gap of about 60 μm between the base material 71 covered with the fluororesin tube and the surface transfer member 72.

The substrate 71 pre-heated and baked of the fluororesin and the infrared heater 78 of the surface transfer member 72 were heated from the outside of the surface transfer member 72 as integrated. In this embodiment, a 3 kW output infrared line heater (parallel light type) having a length (300 mm) substantially equal to that of the base material is arranged at a distance of about 50 mm from the surface of the surface transfer member. In this state, heating was performed at 3 kW for about 3 minutes. At that time, the thermal expansion of the silicone rubber forming the base material is larger than that of the polyimide forming the surface transfer member, and the surface transfer member (polyimide) and the fluororesin do not absorb much infrared rays, so that they have less thermal expansion and are selectively fused. Since the interface was heated, a gap of about 60 μm between the surface transfer member and the substrate was filled, and a state in which the fluororesin layer was pressurized could be efficiently created with low energy. Further, the fluororesin (FEP) on the surface layer of the base material was softened by infrared heating, and a film was formed and smoothed. After the above process, the substrate and the surface transfer member were cooled, and the substrate was extracted from the surface transfer member.

Even though the surface temperature of the roller is cooled to less than 70 ° C., the inner surface of the surface transfer member does not firmly adhere to the fluororesin, and the roller can be safely and easily extracted. did it. In addition, there was no case where the wrinkles of the roller were generated due to the difference in the amount of contraction between the roller and the surface transfer member or the separation at the time of extraction.

The surface roughness of the calcined film of the fluororesin thus obtained was 5.0 μm as a ten-point average roughness (Rz).
The surface pattern of the surface transfer member was transferred to the fluororesin surface, and the fluororesin was deposited. When the surface of the formed fluororesin layer was observed with an electron microscope,
No defects such as cracks were observed on the surface. Further, thermal degradation of the silicone rubber could be suppressed.

(Comparative Example 1) Production of Rollers 8 to 14 For each of the rollers 1 to 7 described above, in order to confirm the effect of the release layer, each manufacturing method does not include a step of forming a release layer. Rollers 8 to 14 were prepared by coating with a fluororesin by the same method except for the above.

If the surface temperature of the roller is 70 ° C. or more,
Although the roller could be pulled out relatively easily, the work required heat-resistant gloves and the safety was insufficient. Further, when the roller was extracted after cooling until the surface temperature of the roller became less than 70 ° C., the inner surface of the surface transfer member and the fluororesin were firmly adhered to each other, and it was sometimes difficult to extract the roller. In addition, the roller may be wrinkled due to the difference in the amount of contraction between the roller and the surface transfer member or due to peeling at the time of removal.

(Cleanability Maintenance Test) It was confirmed as follows that the cleanliness of the inner surface of the surface transfer member could be maintained by forming the release layer.

In the production of the rollers 1 to 14, after the rollers were extracted, the inner surface of the surface transfer member was wiped and washed several times with a cloth soaked with toluene, and the toluene was volatilized. Was manufactured and this was repeated 300 times. Roll each roller 100 times, 20
When the roller was manufactured 0 times and 300 times, the surface roughness was measured at 50 random positions on the fluororesin surface of the obtained roller. Further, the inner surface of the surface transfer member after 300 times was visually observed, and it was observed whether or not there was seizure of a foreign substance or the like.

Table 1 shows the results.

[0129]

[Table 1] The evaluation criteria in the table are as follows: ○: almost the same as the initial (first) surface roughness, Δ: 10 μm in Rz from the initial (first) surface roughness
×: at least one large area. ×: 10 μm in Rz from initial (first) surface roughness
There are at least five large locations.

As is evident from Table 1, the formation of the release layer suppresses the adhesion of foreign matter to the inner surface of the surface transfer member, and prevents the foreign matter from sticking to the inner surface of the surface transfer member. It was also found that even when the production was performed many times, it was possible to maintain the cleanliness of the inner surface of the surface transfer member and to coat the fluororesin having excellent surface smoothness.

Example 8 Production of Fixing Rollers 1 to 3 A fixing roller of a color image forming apparatus was produced in the same manner as in the case of the roller 5.

FIG. 8 is a sectional view of a fixing roller used in a color image forming apparatus. Reference numeral 811 denotes an aluminum core of the fixing roller, and its outer diameter is 58 mm. A 1 mm silicone rubber layer 813, a primer layer 814 made of a mixture of fluoro rubber and fluoro resin of 25 μm, a fluoro resin (F
EP) layer 815 is formed. Fluororesin layer 815
Is sprayed with a fluororesin (FEP) dispersion, dried at 150 ° C. for 20 minutes, and then dried at 300 ° C. for 2 minutes.
It was preheated and baked for 0 minutes, and had a thickness of 1 μm. At this time, the fluororesin layer was not completely formed, and defects such as cracks and irregularities were observed on the surface. The surface roughness of the fluororesin surface is 1 point roughness (Rz) of 1 point.
It was 5 μm.

Next, in the same manner as in the case of the roller 5, it is inserted and fixed to a cylindrical surface transfer member made of polyimide having an inner diameter of 60.2 mm and a thickness of 0.05 mm on which a release layer is formed. 3kW having a length (300mm) almost equal to the substrate from outside of the surface transfer member by an infrared heater
An output infrared line heater (parallel light type) was heated for about 3 minutes at a distance of about 50 mm from the surface transfer member surface. At this time, the surface roughness of the inner surface of the surface transfer member is determined by the ten-point average roughness (R
z), three types of 10 μm (for the production of the fixing roller 1), 5 μm (for the production of the fixing roller 2), and 2 μm (for the production of the fixing roller 3) are prepared. The resin surface was wiped and washed with a cloth soaked in toluene. Table 2 shows the surface roughness and the evaluation as a fixing roller of the fixing roller prepared using each surface transfer member.

(Comparative Example 2) Fixing Roller 4 In the preparation of the fixing rollers 1 to 3, the fixing roller 4 was prepared without performing the smoothing step after the preliminary heating and firing, and the surface roughness was measured and the image was evaluated. However, defects such as cracks and irregularities remained on the surface of the fixing roller 4.

Table 2 shows the results.

[0136]

[Table 2] The evaluation criteria in the table are as follows: ○: no gloss unevenness, Δ: partial gloss unevenness ×: gloss unevenness.

Table 2 shows that the surface roughness of the surface transfer member can be adjusted to any desired value by adjusting the surface roughness of the surface transfer member. It has also been found that unevenness in image gloss, which is a problem in a color image forming apparatus, can be solved by controlling the roughness of the fluororesin surface by the above method.

Example 9 Production of Pressure Rollers 1 to 3 In the same manner as in the case of the roller 5, a pressure roller in an image forming apparatus using a film fixing system driven by a pressure roller was prepared.

FIG. 9 is a sectional view of a pressure roller used in a fixing device of a film fixing type driven by a pressure roller. 9
Reference numeral 11 denotes an aluminum core of the pressure roller, and its outer diameter is 10 mm. A 3 mm silicone rubber layer 913 and a 25 μm primer layer 91 made of a mixture of fluoro rubber and fluoro resin are formed on the core metal in the same manner as in Example 5.
4. A fluorine resin (FEP) layer 915 is formed.
The fluororesin layer 915 was formed by spraying a dispersion of fluororesin (FEP) by spraying, drying at 150 ° C. for 20 minutes, and preheating and firing at 300 ° C. for 20 minutes, and had a thickness of 15 μm. At this time, the fluororesin layer was not completely formed, and defects such as cracks and irregularities were observed on the surface. The surface roughness of the fluororesin surface was 15 μm in terms of ten-point average roughness (Rz).

Next, in the same manner as in the case of the roller 5, it is inserted and fixed into a cylindrical surface transfer member made of polyimide having an inner diameter of 16.6 mm and a thickness of 0.05 mm on which a release layer is formed. 3kW having a length (300mm) almost equal to the substrate from outside of the surface transfer member by an infrared heater
An output infrared line heater (parallel light type) was heated for about 3 minutes at a distance of about 50 mm from the surface transfer member surface. At this time, the surface roughness of the inner surface of the surface transfer member is determined by the ten-point average roughness (R
z), 25 μm (for producing pressure roller 1), 10 μm
(For producing pressure roller 2), 1.5 μm (pressure roller 3)
Were prepared under the above conditions, and the surface of the fluororesin was wiped off with a cloth soaked with toluene and washed. Table 3 shows the surface roughness and the evaluation as a pressure roller of the pressure roller prepared using each surface transfer member.

(Comparative Example 3) Pressure Roller 4 In the production of the pressure rollers 1 to 3, the pre-heated and fired fluororesin-coated pressure roller was not inserted into the surface transfer member under the same conditions as in the example. Heating was performed for about 10 minutes by infrared rays to form a film of a fluororesin. This is the time required to completely form the film on the surface. As a result, the surface roughness was improved, but the silicone rubber in the lower layer was deteriorated and the permanent compression strain was deteriorated.

For this pressure roller, the surface roughness was measured, and the transportability and image evaluation were performed. The results are shown in Table 3.

[0143]

[Table 3] The evaluation criteria in the table are as follows: 以下: good, Δ: partially defective, ×: defective.

From Table 3, it was found that the surface roughness of the surface of the fluororesin can be adjusted by adjusting the surface roughness of the inner surface of the surface transfer member. As a result, it was found that the roughness of the fluororesin surface of the pressure roller could be set to a desired value, and good transfer material transportability and an image could be realized.

Although the pressure roller 4 had good surface roughness due to prolonged heating, the transferability of the transfer material and the image deteriorated due to the deterioration of the underlying silicone rubber. This means that transfer material transferability and image defects in a film fixing device driven by a pressure roller can be solved by controlling the surface roughness of the fluororesin tube by the method of the present invention.

[0146]

As described above, by forming a release layer made of a lubricating liquid between the fluororesin powder layer and the inner surface of the surface transfer member, the inner surface of the surface transfer member and the fluororesin are separated. Strong adhesion is suppressed, and the removal of the roller can be performed safely at a low temperature with good workability, and the difference in the amount of contraction between the roller and the surface transfer member and the wrinkling of the roller due to peeling at the time of removal can be suppressed.

Further, it is possible to suppress the adhesion of foreign matter to the inner surface of the surface transfer member, maintain the cleanliness of the inner surface of the surface transfer member, and form a fluororesin layer having excellent surface smoothness.

[Brief description of the drawings]

FIG. 1 is a schematic diagram for explaining a method of manufacturing a roller 1 according to the present invention.

FIG. 2 is a schematic diagram for explaining a method of manufacturing the roller 2 according to the present invention.

FIG. 3 is a schematic view for explaining a method of manufacturing the roller 3 according to the present invention.

FIG. 4 is a schematic diagram for explaining a method of manufacturing the roller 4 according to the present invention.

FIG. 5 is a schematic diagram for explaining a method of manufacturing the roller 5 according to the present invention.

FIG. 6 is a schematic diagram for explaining a method of manufacturing the roller 6 according to the present invention.

FIG. 7 is a schematic diagram for explaining a method of manufacturing the roller 7 according to the present invention.

FIG. 8 is a schematic diagram for explaining a cross section of a fixing roller in the present invention.

FIG. 9 is a schematic diagram for explaining a cross section of a pressure roller according to the present invention.

FIG. 10 is a schematic diagram illustrating an electrophotographic apparatus according to the present invention.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme court ゛ (Reference) B29L 9:00 B29L 9:00 23:00 23:00 (72) Inventor Masaaki Takahashi 3 Shimomaruko 3 Ota-ku, Tokyo Inside Canon Inc. (72) Hideo Kawamoto, Inventor 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc. (72) Inventor Yuji Kitano 3-30, Shimomaruko, Ota-ku, Tokyo No. 2 F term in Canon Inc. (reference) 2H033 BA45 BB05 BB06 BB08 BB14 BB26 BB30 BB31 3J103 AA14 AA15 AA23 AA24 AA32 AA33 AA41 AA51 BA41 EA07 EA20 FA05 FA07 FA09 FA15 FA18 GA02 HA57 HA03 HA03 HA37 HA03 HA03 HA46 HA53 HA54 HA60 4F205 AA16 AA33 AA45 AC04 AD12 AG03 AG08 AH33 AJ02 AJ03 AJ06 AJ11 AK04 AR13 AR17 GA15 GB01 GB11 GC04 GE02 GE06 GE07 GE27 GF01 GF23 GN04 GN13 GN18 GN29

Claims (19)

[Claims] 1. A step of inserting a base material having a fluororesin powder layer on its surface into a cylindrical surface transfer member, and heating the surface transfer member from the outside with an infrared heater to form the base material and the surface Utilizing the difference in the coefficient of thermal expansion with the transfer member, heating the fluororesin powder layer in a pressurized state, and a smoothing step of forming a fluororesin layer, a fluororesin coating method comprising at least A fluororesin coating method, wherein a release layer made of a lubricating liquid is formed between the fluororesin powder layer and the inner surface of the surface transfer member. 2. The release layer has a thickness of 0.01 m per unit area.
g / cm ² or more 1 mg / cm ² or less of the fluorine resin coating method according to claim 1, characterized in that from the lubricating liquid. 3. The method according to claim 1, further comprising, after the smoothing step, a step of cooling the base material and the surface transfer member and releasing the fluororesin layer from an inner surface of the surface transfer member. 3. The fluororesin coating method according to 1 or 2. 4. The method according to claim 3, wherein the cooling is performed such that the temperature of the fluororesin layer is lower than 70 ° C. 5. The fluororesin coating method according to claim 1, wherein said lubricating liquid is mainly composed of silicone oil. 6. The lubricating liquid according to claim 1, wherein the lubricating liquid contains a solvent and 10% to 90% by mass of silicone oil based on the whole of the lubricating liquid. The fluororesin coating method according to any one of the above. 7. The viscosity of the silicone oil at 25 ° C. is 1 × 10 ⁻⁶ m ² / sec or more and 1 × 10 ⁻² m ² / s
7. The fluororesin coating method according to claim 5, wherein the value is not more than ec. 8. The fluororesin coating according to claim 5, wherein the silicone oil is at least one silicone oil selected from the group consisting of dimethyl silicone oil and phenylmethyl silicone oil. Method. 9. The fluororesin coating method according to claim 1, wherein said fluororesin powder layer is formed by applying an aqueous paint of a fluororesin. 10. The fluororesin coating method according to claim 1, wherein the fluororesin powder layer is baked by preheating and is fixed on the surface of the base material. 11. The fluororesin coating method according to claim 1, wherein the substrate has a multilayer structure including at least one layer containing a rubber component. 12. The fluororesin coating method according to claim 1, wherein the surface transfer member transmits at least 50% of infrared rays. 13. The infrared absorptance of the surface transfer member and the release layer is not more than the infrared absorptivity of the fluororesin powder layer, and the infrared absorptivity of the substrate surface is the infrared absorptivity of the fluororesin powder layer. The fluororesin coating method according to any one of claims 1 to 12, wherein the absorption rate is larger than the absorption rate. 14. The surface transfer member is made of polyimide, Ni
The fluororesin coating method according to any one of claims 1 to 13, wherein the method is made of electroforming or glass. 15. The fluororesin coating method according to claim 1, wherein the inner surface of the base material is cooled before at least one of the smoothing step and during the smoothing step. . 16. The fluororesin coating method according to claim 1, wherein the ten-point average surface roughness (Rz) of the fluororesin layer is 20 μm or less. 17. A toner fixing member coated with a fluororesin by the method according to claim 1. Description: 18. A toner fixing device comprising the toner fixing member according to claim 17. 19. An electrophotographic apparatus comprising the toner fixing device according to claim 18.