JP3990809B2 - Fluororesin coating method, fixing member manufacturing method, and electrophotographic apparatus - Google Patents

Description

〇：光沢ムラなし
△：一部光沢ムラあり
×：光沢ムラあり
【００７７】
表１より、面転写部材の内面の表面粗さを調整することにより、フッ素樹脂表面に任意の粗さを形成することが可能であることがわかる。またカラー画像形成装置において問題となる画像光沢ムラについては、上記の方法でフッ素樹脂表面の粗さを制御することにより解決される。
【００７８】
実施例６
実施例２と同様の方法で加圧ローラ駆動のフィルム定着方式を用いた加圧ローラを作成した。
【００７９】
図９に加圧ローラ駆動のフィルム定着方式の定着装置に用いられる加圧ローラの断面図を示す。９１１は加圧ローラのアルミニウム芯金であり、その外径は１０ｍｍである。その芯金上に実施例５と同様の方法で、３ｍｍのシリコーンゴム層９１３、２５μｍのフッ素ゴムとフッ素樹脂の混合物から成るプライマー層９１４、フッ素樹脂（ＦＥＰ）層９１５が形成されている。フッ素樹脂層９１５はフッ素樹脂（ＦＥＰ）のディスパージョンをスプレーで塗装し、１５０℃で２０分乾燥した後、３００℃で２０分の予備加熱焼成をしたもであり、厚みは１５μｍであった。その際フッ素樹脂層は完全には成膜されておらず、表面にクラック・凹凸等の不良が見られた。またフッ素樹脂表面の表面粗さは、十点平均粗さ（Ｒｚ）で１５μｍであった。
【００８０】
上記のような方法で作成した加圧ローラを、内径１６．６ｍｍ、肉厚０．０５ｍｍの円筒形をしているポリイミドでできた面転写部材に挿入固定、一体化して赤外線ヒータにより面転写部材の外側から基材とほぼ同等の長さ（３００ｍｍ）を持つ３ｋｗ出力の赤外線ラインヒータ（平行光タイプ）を面転写部材表面より約５０ｍｍ離して約３分間加熱した。その際の面転写部材の内面の表面粗さは、十点平均粗さ（Ｒｚ）で２５μｍ（実施例６・１）、１０μｍ（実施例６・２）、１．５μｍ（実施例６・３）の３種類を用意し、それぞれ上記条件において定着ローラを作成した。それぞれの面転写部材を用いて作成した加圧ローラについて、その表面粗さと、加圧ローラとしての評価を表２に示す。
【００８１】
比較例２
実施例６おいて、予備加熱焼成後のフッ素樹脂被覆加圧ローラについて、面転写部材に挿入することなく、実施例６と同じ条件で約１０分赤外線加熱をしてフッ素樹脂を成膜した。これは表面を完全に成膜するに必要な時間であり、このため表面粗さは良くなったが下層のシリコーンゴムが劣化しセットが落ちてしまい搬送性も悪くなってしまった。
【００８２】
この加圧ローラについて表面粗さの測定搬送性および画像評価を行い、表２に示した。
【００８３】
【表２】

〇：良好
△：一部不良あり
×：不良あり
【００８４】
表２より、面転写部材の内面の表面粗さを調整することにより、フッ素樹脂表面に任意の粗さを形成することが可能であることがわかる。また加圧ローラの駆動のフィルム定着装置における転写材搬送性及び画像不良については、上記の方法でフッ素樹脂表面の粗さを制御することにより解決される。
【００８５】
【発明の効果】
以上説明したように、円筒または円柱基材上にフッ素樹脂の粉体またはその水性塗料をコーティングし、その基材を円筒状の面転写部材に挿入し、赤外線ヒータを用い面転写部材の外側より加熱することにより基材と面転写部材の熱膨張率の差を利用し面転写部材によりフッ素樹脂層を加圧した状態で加熱して、面転写部材の表面模様をフッ素樹脂層表面に転写させることによって、基材を劣化させずに、クラックのないフッ素樹脂を形成することができるようになった。また、フッ素樹脂層の表面への任意の模様または粗さの付与ができるようになった。
【００８６】
また上記方法を用いて、画像形成装置の定着装置に用いられる、トナーと直接接する定着部材を作成した場合、表層フッ素樹脂の表面粗さを制御することができ、画像の光沢ムラを防止することが可能となった。
【００８７】
また上記方法を用いて、画像形成装置の定着装置の駆動側に用いられる定着部材を作成した場合、表層フッ素樹脂の表面粗さを制御することができ、搬送性及び画像荒れ不良を防止することが可能となった。
【図面の簡単な説明】
【図１】 参考例１の説明図で、Ａのフッ素樹脂被覆方法の概略図、Ｂは被覆された基材の断面図である。
【図２】 参考例２の説明図で、Ａはフッ素被覆方法の概略図、Ｂは被覆された基材の断面図である。
【図３】 参考例３の説明図で、Ａはフッ素樹脂被覆方法の概略図、Ｂは被覆された基材の断面図である。
【図４】 実施例１の説明図で、Ａはフッ素樹脂被覆方法の概略図、Ｂは被覆された基材の断面図である。
【図５】 実施例２の説明図で、Ａはフッ素樹脂被覆方法の概略図、Ｂは被覆された基材の断面図である。
【図６】 実施例３の説明図で、Ａはフッ素樹脂被覆方法の概略図、Ｂは被覆された基材の断面図である。
【図７】 実施例４の説明図で、Ａはフッ素樹脂被覆方法の概略図、Ｂは被覆された基材の断面図である。
【図８】 実施例５の定着ローラの断面図である。
【図９】 実施例６の加圧ローラの断面図である。
【図１０】 電子写真装置の概略図である。[0001]
BACKGROUND OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluororesin coating method on a cylindrical or cylindrical substrate, a toner fixing member manufactured by this method, and an electrophotographic image forming apparatus such as a copying machine or LBP provided with this toner fixing member It is.
[0002]
[Prior art]
A fixing roller, a fixing film, a pressure roller, and the like used as a fixing member of an electrophotographic image forming apparatus often use a fluororesin for the surface layer because toner releasability is required for use.
[0003]
In the case of forming a full-color toner image, in the fixing roller or fixing film for fixing a maximum of four toner layers, the fluororesin layer as the surface toner release layer completely transfers heat to the toner. In order to improve the fixing property of the toner to the recording material, it is necessary to have flexibility to follow the unevenness of the toner and the transfer material. Therefore, a fixing member having a configuration in which a flexible elastic layer is provided under the fluororesin layer that is a toner release layer is used.
[0004]
Conventionally, as a fixing member used as a fixing member of an electrophotographic image forming apparatus, an elastic layer is formed on a cylindrical or columnar metal core, and a fluororesin is formed as a toner release layer on the outer peripheral surface thereof. Is often used. Recently, an elastic layer formed on a heat-resistant resin core and a fluororesin film as a toner release layer formed on the outer peripheral surface thereof are also used.
[0005]
As a method of coating the peripheral wall of a cylindrical or columnar substrate with a fluororesin, a method of heating and firing after coating the fluororesin powder or fluororesin dispersion on the substrate has been used. When the fluororesin is heated and fired, a method of heating to a melting point of the fluororesin or higher to form a fired film has been taken.
[0006]
[Problems to be solved by the invention]
However, the conventional fluororesin coating method has the following problems.
[0007]
First, when the base material is an elastic body, coating the fluororesin on the elastic body, and heating and baking, the melt viscosity of the fluororesin is extremely high. The smoothness of the obtained fluororesin layer is lowered. Moreover, when the fluororesin firing conditions as described above are executed, there is no elastic body that can withstand the temperature, so that the elastic body is extremely damaged. As a result, the compression set of the elastic layer deteriorates and the paper transportability required for the fixing member cannot be obtained. In addition, in order to suppress the damage, if an attempt is made to keep the firing temperature of the fluororesin low, there is a problem that the fluororesin cannot be completely melted, cracks are generated on the surface, and desired surface properties cannot be obtained. It was.
[0008]
In order to solve the above problems, the inventors pressurized the fluororesin layer between the elastic body and the surface transfer member disposed outside the fluororesin layer so that the surface pattern of the surface transfer member becomes the surface of the fluororesin. We proposed a method of heat-firing film formation of fluororesin while transferring. As a result, while controlling the surface pattern of the fluororesin, it becomes possible to deposit the fluororesin at a lower temperature than before, and the damage to the elastic body (rubber) as the lower material can be kept relatively small. Became. However, even with this method, damage to the elastic body (rubber) could not be completely suppressed.
[0009]
An object of the present invention is to provide a method of coating the outer wall of a cylinder or column of fluororesin that solves the above problems.
[0010]
Another object of the present invention is to provide a coating method capable of coating a substrate with a crack-free fluororesin layer.
[0011]
Another object of the present invention is to provide a coating method capable of coating a substrate with a fluororesin layer having a desired surface roughness.
[0012]
  Another object of the present invention is to provide a method for coating the fluororesin layer.The present invention provides a method for manufacturing a fixing member using the same and an electrophotographic apparatus using the same..
[0013]
[Means for Solving the Problems]
  The fluororesin coating method according to the present invention comprises (i) a fluororesin powder layer on the peripheral surface.,Cylindrical or cylindricalMulti-layer structure with elastic layer made of silicone rubberA step of inserting a base material into a hollow portion of a cylindrical surface transfer member having an infrared transmittance of 50% or more and fixing the base material and the surface transfer member so that their center lines coincide with each other.(However, infrared absorption is the surface transfer member ≦ the fluororesin <the substrate surface)When,
  (Ii) Using an infrared heater disposed outside the surface transfer member, while rotating the surface transfer member to which the substrate is fixed obtained in the step (i), Infrared absorption using the surface transfer member ≤ fluororesin <base material surfaceThe fluororesin powder layer is heated in a state where the elastic layer and the surface transfer member are pressurized by utilizing the difference in thermal expansion coefficient between the elastic layer and the surface transfer member. And a step of forming a fluororesin layer.
[0014]
According to the present invention, a fluororesin powder layer is formed by coating a fluororesin (FEP, PFA, PTFE, etc.) powder or an aqueous paint thereof on a base material such as a cylinder or a column. The fluororesin powder layer is heated while being pressurized using the difference in thermal expansion coefficient between the base material 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 the heating method, the fluororesin layer on the surface of the substrate can be efficiently heated, and the surface pattern of the surface transfer member is transferred to the surface of the fluororesin layer. By doing so, it becomes possible to give an arbitrary pattern and roughness.
[0015]
Further, in the present invention, the heating conditions for forming the crack-free fluororesin layer are relaxed by heating the fluororesin powder layer under pressure. When there is another polymer layer such as a rubber layer under the resin layer, thermal degradation of the polymer layer can be prevented.
[0016]
Application of the fluororesin powder to the surface of the substrate may be performed by an electrostatic coating method, but it is preferable to use a water-based paint containing fluororesin powder from the viewpoint of ease.
[0017]
In addition, it is preferable in terms of handling that the fluororesin powder on the surface of the base material is preheated and fired to be immobilized on the surface of the base material.
[0018]
In addition, it is preferable for the surface transfer member to transmit infrared rays by 50% or more for efficient heating. Further, in terms of efficiently heating the fluororesin with infrared rays, it is preferable that the absorption of infrared rays is surface transfer member ≦ fluorine resin layer <base layer surface.
[0019]
  The cylindrical or columnar substrate in the present invention is not particularly limited, but a metal core such as iron or aluminum.MoneyA base material with a multilayer structure in which heat-resistant rubber such as silicone rubber and fluorine rubber is formedRu. These are preferable as a fixing roller base material. In addition, as a fixing film substrate, a film made of a heat-resistant resin such as polyimide or a metal such as nickel or iron is used.AboveA base material with a multilayer structure in which heat-resistant rubber such as silicone rubber and fluorine rubber is formedRu.
[0020]
  The actual structure of the base material (base layer) was described in detail in the examples and drawings described later.1) Metal core, Silicone rubber primer layer, Silicone rubber, Fluoro rubber / Fluoro resin layer (2) Polyimide film, silicone rubber primer layer, silicone rubber, fluororubber / fluororesin layer
and so on.
[0021]
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.
[0022]
  The material of the cylindrical surface transfer member is not particularly limited as long as it can withstand the temperature required when the fluororesin powder is fired and formed.ButIt is preferable to use a heat-resistant resin such as imide / polyphenylene sulfide. Polyimide thin layer chew as surface transfer memberBugaIf lath is used, it is easy to handle and has excellent heat resistance and strength at high temperatures, so that it can be used repeatedly and durability of the surface transfer member is improved.
[0023]
The shape of the surface transfer member is cylindrical, and the inner diameter thereof is slightly larger than the outer diameter of the cylindrical or columnar member in which the fluororesin layer is formed on the substrate, and the lengths must be at least the same. It is. The gap when both are fitted is preferably as narrow as possible, although it depends on the difference in thermal expansion coefficient during heating in the combination of the two, and is usually 5 to 1000 μm.
[0024]
The inner surface finish of the surface transfer member is as follows: (1) First, in the case of a product made by removal processing (metal mold), the inner surface is formed by drilling, lathe processing, etc., and then finished to the desired surface roughness by honing. Also, if you want to roughen, perform blasting after honing.
[0025]
(2) In the case of products made by additional processing (metal electroforming, resin) The master rod of the transfer member is made and the metal and resin are formed on the surface and removed from the master, but the master surface is cut, polished, What is necessary is just to make it a desired surface roughness by 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.
[0026]
An infrared heater for heating the surface transfer member into which the substrate coated with fluororesin powder is integrated is not particularly limited. For example, the infrared heater has the same length as the surface transfer member. A parallel light type line heater is used to keep both axes parallel to the surface transfer member and maintain an appropriate distance, and the surface transfer member is heated while rotating. What is necessary is just to determine suitably the output, distance, etc. of a heater so that a heating time may be uniformly heated in several minutes thru | or the number of pick-up. The temperature of the fluororesin layer at the time of heating is the melting temperature of the fluororesin used, and is usually about 280 to 320 ° C. although it varies depending on the fluororesin used.
[0027]
Further, the above-described operation may be performed after the fluororesin powder layer is preliminarily heated and fired. The preheating and baking of the fluororesin may be performed until the fluororesin is completely formed, but this is not particularly necessary, and it is sufficient if the fluororesin is temporarily raised to the melting temperature of the fluororesin. At this time, cracks, irregularities, etc. may exist on the surface of the fluororesin. Further, the temperature of the fluororesin layer in the step of heating the fluororesin-coated substrate and the surface transfer body after preheating and firing is not particularly limited as long as it is 200 ° C. or higher, but it is not necessary to raise it to the melting temperature, preferably It is 240 degreeC-290 degreeC. When this method is used, an arbitrary surface pattern can be imparted to the fluororesin with a smaller amount of heat than when no preheating and firing are performed. When a non-heat-resistant material such as resin or rubber is used as the base material, thermal deterioration of the base material occurs when the fluororesin is heated and fired. However, when this method is used, thermal deterioration of the base material is prevented by rapid heating with infrared rays. can do. In addition, since high temperature is not required at the time of pressurizing the fluororesin layer, the work efficiency is good, and the weight of the pressurizer and the like can be reduced. The material of the surface transfer member is not particularly limited as described above.
[0028]
When the coefficient of thermal expansion of the substrate coated with fluororesin is greater than the coefficient of thermal expansion of the surface transfer member, insert the substrate coated with fluororesin into the surface transfer member and use an infrared heater from the outside of the surface transfer member. When heated, the thermal expansion of the substrate is greater than that of the surface transfer member, so the fluororesin layer is pressurized between the substrate and the surface transfer member, and the inner surface pattern of the surface transfer member is transferred to the surface of the fluororesin. The
[0029]
If the thermal expansion coefficient of the substrate coated with fluororesin is smaller than that of the surface transfer member, insert the fluororesin coated substrate into the surface transfer member with the outer surface fixed and use an infrared heater. The fluororesin layer is pressed between the surface transfer member heated from the outside of the surface transfer member and fixed on the outer surface and the base material, and the inner surface pattern of the surface transfer member is transferred to the surface of the fluororesin.
[0030]
In any of the methods described above, the base material may have a multilayer structure, and the surface layer of the base material may be made of heat-resistant rubber.
[0031]
  When an infrared heater is used and heated from the outside of the surface transfer member and a fluororesin is pressed between the surface transfer members, the fluororesin can be easily formed even if the temperature applied during the baking of the fluororesin is set low. Deterioration of the substrate can be suppressed by being able to carry out, being able to directly heat the surface fluororesin, being capable of rapid heating, and the like. At that time, the inner surface of the surface transfer member can be transferred onto the surface of the fluororesin, and a desired pattern can be formed on the surface of the fluororesin. Furthermore, if the surface transfer member is a material that transmits infrared rays by 50% or more, the surface transfer member itself is not absorbed so much, and its energy reaches the fluororesin and the thermal expansion of the surface transfer member is also reduced.ByThe inner surface of the surface transfer member can be transferred to the surface of the fluororesin with less energy, and a desired pattern can be formed on the surface of the fluororesin. That is, the thermal deterioration of the base layer can be further suppressed. In addition, by absorbing infrared rays as surface transfer member ≦ fluorine resin <base layer surface (fusion interface), the fusion interface can be directly heated, so the inner surface of the transfer member can be more efficiently transferred to the fluororesin surface. Thus, a desired pattern can be formed on the surface of the fluororesin.
[0032]
  If the inner surface of the cylindrical base material is cooled before and / or during heating,suppressbe able to.
[0033]
The fixing member used in the electrophotographic image forming apparatus is required to have toner releasability in view of its function. Among the fixing members, in particular, the fixing roller and the fixing film that come into contact with the toner are required to have smoothness of the surface layer fluororesin in order to prevent uneven gloss of the printed image. Gloss unevenness of a printed image occurs when the surface pattern of the surface layer fluororesin of the fixing roller and the fixing film is transferred to the surface of the toner image, and is noticeable when printing a solid image, particularly a color image for photographic printing. Appears. According to studies by the inventors, the gloss unevenness of the printed image depends on the surface roughness of the fixing roller and the fixing film, and the surface roughness of the surface layer fluororesin of the fixing roller and the fixing film is determined by the ten-point average roughness ( Rz) 5 μm or less can prevent this. However, as described above, it has been extremely difficult to form a desired roughness on the surface of the fluororesin until now, and the surface layer fluororesin of the fixing roller and the fixing film is polished to prevent the image gloss unevenness. The method of controlling was used.
[0034]
Using the method of the present invention, a fluororesin is coated on the fixing roller or fixing film substrate, and the fixing roller or fixing film substrate is heated with the surface transfer member while heating the fluororesin from the outside of the surface transfer member using an infrared heater. By applying pressure, a desired pattern can be formed on the surface fluororesin of the fixing roller and the fixing film. That is, if a pattern having a roughness of 5 μm or less is formed in advance on the inner surface of the surface transfer member, the inner surface of the surface transfer member is transferred to the surface of the fixing roller and the fixing film surface fluororesin, and the roughness is 5 μm or less and the desired roughness. It is possible to form a film of fluororesin. As a result, image gloss unevenness can be prevented. The pressure roller is Rz 20 microns or less, and no image roughness is observed.
[0035]
Among the fixing members, in particular, a fixing member that requires transferability of the transfer material requires a certain degree of roughness so that the transfer member surface layer fluororesin has a transfer material transfer capability. According to the inventors' investigation, it has been found that the surface roughness of the fluororesin sufficient for transporting the transfer material is in the range of 2 to 20 μm in terms of 10-point average roughness (Rz). Within that range, the best surface roughness is determined by the required transportability and other performance (image performance, etc.).
[0036]
Using the method of the present invention, the fluororesin is coated on the base material of the fixing member, and the base material is pressed by the surface transfer member while heating the fluororesin from the outside of the surface transfer member using an infrared heater. It became possible to form a desired pattern on the member surface layer fluororesin. That is, if a pattern having a roughness of 2 to 20 μm is formed in advance on the inner surface of the surface transfer member, the inner surface of the surface transfer member is transferred to the surface of the fixing member surface layer fluororesin, and the desired roughness is 2 to 20 μm. It is possible to form a film of fluororesin. As a result, the required transfer material transportability can be imparted to the fixing member.
[0037]
FIG. 10 shows an electrophotographic apparatus to which the toner fixing member according to the present invention is applied. The photosensitive member, the latent image forming means, the means for developing the formed latent image with toner, the means for transferring the developed toner image to a transfer material, An electrophotographic apparatus having means for fixing a toner image on a transfer material is also included. An example of this device is shown in FIG.
[0038]
Reference numeral 5 denotes a photoconductor, which is driven to rotate at a predetermined peripheral speed in the direction of the arrow about the shaft 5a.
[0039]
The photosensitive member 5 is uniformly charged at a predetermined positive or negative potential on the peripheral surface thereof by the charging means 6 during the rotation process, and then the light image exposure L (slit exposure or laser exposure) is performed by the image exposure means (not shown) in the lightning unit 7. Beam scanning exposure). As a result, electrostatic latent images corresponding to image exposure are sequentially formed on the circumferential surface of the photoreceptor.
[0040]
The electrostatic latent image is then developed with toner by the developing unit 8, and the toner developed image is synchronized with the rotation of the photoconductor 5 between the photoconductor 5 and the transfer unit 9 from a paper supply unit (not shown) by the transfer unit 9. The image is sequentially transferred onto the surface of the transfer material P taken and fed. The transfer material P that has received the image transfer is separated from the surface of the photosensitive member, introduced into the image fixing means 2, undergoes image fixing, and is printed out as a copy (copy). After the image transfer, the surface of the photoreceptor 5 is cleaned by the transfer unit 3 after removal of the transfer residual toner, is subjected to charge removal processing by the pre-exposure unit 1 and repeatedly used for image formation. As the uniform charging means 6 for the photoreceptor, 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.
[0041]
DETAILED DESCRIPTION OF THE INVENTION
  Reference example1
  The present inventionPertaining toFirstReference exampleWill be described with reference to FIG.
[0042]
11 is a cylindrical base material having a fluororesin coating on the outermost layer, and a cross-sectional view thereof is shown in FIG. 1B. 111 is a cored bar of a cylindrical base material, which is made of aluminum and has an outer diameter of 40 mm. A fluororesin primer layer 112 is formed on the core metal 111 to bond the surface fluororesin and the core metal, and a fluororesin coating layer 113 is formed thereon. The primer layer 112 was formed by applying an aqueous paint of a fluororesin primer by spraying and then drying at 150 ° C. for 30 minutes, and the thickness thereof was 8 μm. After the primer layer coating as described above was finished, a fluororesin (PFA) dispersion was applied by spraying and dried at 150 ° C. for 30 minutes. The thickness of the fluororesin layer was 25 μm.
[0043]
  A surface transfer member 12 has a cylindrical shape having an inner diameter of 40.1 mm and 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 substrate is formed. BookReference exampleThe surface transfer member inner surface was processed to have a surface roughness of 5 μm. In this example, the inner surface of the surface transfer member was processed to have a surface roughness of 5 μm. In this embodiment, the surface transfer member 12 is made of a Ni electroformed film having a low coefficient of thermal expansion due to the base material 11.
[0044]
  The fluororesin-coated base material 11 was inserted into 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. At that time, there is a gap of about 20 μm between the fluororesin-coated substrate 11 and the surface transfer member 12. The fluororesin-coated substrate 11 and the surface transfer member 12 integrated as described above were heated from the outside of the surface transfer member 12 by the infrared heater 18. BookReference exampleThen, a 3 kW output infrared line heater (parallel light type) having approximately the same length (300 mm) as that of the substrate was disposed about 50 mm away from the surface transfer member surface. In this state, the mixture was heated at 3 kw for about 10 minutes. At that time, the thermal expansion of the aluminum constituting the base material is larger than that of the Ni constituting the surface transfer member, so that the aluminum expands further, filling the gap of about 20 μm between the surface transfer member and the base material, and further fluorine. A state where the resin layer is pressurized is created. Also, the fluororesin (PFA) on the surface of the base material is softened by infrared heating to form a film. After completion of the above steps, the substrate and the surface transfer member are cooled, and the substrate is extracted from the surface transfer member.
[0045]
The surface roughness of the fluororesin fired film thus obtained is 5 μm in terms of 10-point average roughness (Rz), the surface pattern of the surface transfer member is transferred to the surface of the fluororesin, and the fluororesin is A film was formed. Further, 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, it could be processed in a much shorter time than heating in an oven (about 20 minutes).
[0046]
  Reference example2
  The present inventionPertaining toSecondReference exampleWill be described with reference to FIG.
[0047]
  21 is a cylindrical base material having a fluororesin coating on the outermost layer, and a cross-sectional view thereof is shown in FIG. 2B. 211 is a core of a cylindrical base material, which is made of aluminum and has an outer diameter of 40 mm. A fluororesin primer layer 212 is formed on the core metal 211 to adhere the surface fluororesin and the core metal, and a fluororesin coating layer 213 is formed thereon. The primer layer 212 was formed by applying an aqueous paint of a fluororesin primer by spraying and then drying at 150 ° C. for 30 minutes, and the thickness thereof was 8 μm. After the primer layer coating as described above has been completed, the fluororesin coating layer was sprayed with a fluororesin (PFA) dispersion, dried at 150 ° C. for 30 minutes, and then preheated and fired at 350 ° C. for 20 minutes. The thickness was 25 μm. At that 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 in terms of 10-point average roughness (Rz). A surface transfer member 22 has a cylindrical shape with an inner diameter of 40.1 mm and 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 substrate is formed. BookReference exampleThe surface transfer member inner surface 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. The base material 21 on which the fluororesin coating and the fluororesin are preheated and fired is inserted into the surface transfer member 22, 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, there is a gap of about 20 μm between the fluororesin-coated substrate 21 and the surface transfer member 22. The base material 21 and the surface transfer member 22, which were integrated as described above and were preheated and fired with the fluororesin coating, and the surface transfer member 22 were heated from the outside of the surface transfer member 22 by the infrared heater 28. BookReference exampleThen, a 3 kW output infrared line heater (parallel light type) having approximately the same length (300 mm) as that of the substrate was disposed about 50 mm away from the surface transfer member surface. In this state, it was heated at 3 kw for about 8 minutes. At that time, the thermal expansion of the aluminum constituting the base material is larger than that of the Ni constituting the surface transfer member, so that the aluminum expands further, filling the gap of about 20 μm between the surface transfer member and the base material, and further fluorine. A state where the resin layer is pressurized is created. Further, the fluororesin (PFA) on the surface layer of the substrate is softened by infrared heating to form a film. After completion of the above steps, the substrate and the surface transfer member are cooled, and the substrate is removed from the surface transfer member.
[0048]
The surface roughness of the fluororesin fired film thus obtained is 5.2 μm in terms of 10-point average roughness (Rz), the surface pattern of the surface transfer member is transferred to the surface of the fluororesin, and fluorine A resin film was formed. Further, 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, it could be processed in a much shorter time than heating in an oven (about 20 minutes).
[0049]
  Reference example3
  The present inventionPertaining toThirdReference exampleWill be described with reference to FIG.
[0050]
  31 is a cylindrical base material having a fluororesin in the outermost layer, and a cross-sectional view thereof is shown in FIG. 3B. Reference numeral 311 denotes a cored bar of a cylindrical base material, which is made of SUS and has an outer diameter of 40 mm. An LTV silicone rubber layer 313 is bonded onto the cored bar 311 via a primer layer 312 and has a thickness of 1 mm. The silicone rubber layer was formed by inserting a core metal coated with a primer into a cylindrical mold, injecting uncured silicone rubber of LTV, and heating and curing it. 314 is a primer layer for adhering the silicone rubber layer 313 and the surface fluororesin layer, and is composed of a mixture of fluororubber and fluororesin (FEP). The primer layer 314 was obtained by spraying an aqueous paint composed of a mixture of fluororubber and fluororesin by spraying and heating and curing at 200 ° C. for 30 minutes, and its thickness was 25 μm. A fluororesin (FEP) layer 315 is formed on the primer layer 314. The fluororesin layer 315 was obtained by applying a fluororesin (FEP) dispersion by spraying, drying at 150 ° C. for 20 minutes, and pre-baking at 300 ° C. for 20 minutes, and the thickness was 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 10-point average roughness (Rz). 32 is a surface transfer member having an inner diameter of 42.2 mm,ThicknessIt has a cylindrical shape 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 substrate is formed. BookReference exampleThe surface transfer member inner surface 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. The base material 31 that has been pre-heated and baked with the fluororesin coating and the fluororesin is inserted into the surface transfer member 32 and further fixed with a fixing member (not shown) so that the center lines of the base material and the surface transfer member coincide. Integrated. At that time, there is a gap of about 60 μm between the fluororesin-coated substrate 31 and the surface transfer member 32. The base material 31 and the surface transfer member 32, which were integrated with the fluororesin coating and preheated and fired as described above, were heated from the outside of the surface transfer member 32 by the infrared heater 38. BookReference exampleThen, a 3 kW output infrared line heater (parallel light type) having approximately the same length (300 mm) as that of the substrate was disposed about 50 mm away from the surface transfer member surface. In this state, it was heated at 3 kw for about 6 minutes. In that caseCompositionSince the thermal expansion of the formed silicone rubber is larger than that of Ni constituting the surface transfer member, the silicone rubber expands further, filling the gap of about 60 μm between the surface transfer member and the base material, and further the fluororesin layer Create a pressurized state. Further, the fluororesin (FEP) on the substrate surface layer is softened by infrared heating to form a film. After completion of the above steps, the substrate and the surface transfer member are cooled, and the substrate is extracted from the surface transfer member.
[0051]
The surface roughness of the fluororesin fired film thus obtained is 4.8 μm in terms of 10-point average roughness (Rz), the surface pattern of the surface transfer member is transferred to the surface of the fluororesin, and fluorine A resin film was formed. Further, 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, it could be processed in a much shorter time than heating in an oven (about 20 minutes). However, some deterioration of the silicone rubber was observed.
[0052]
  Example1
  First of the present invention1This embodiment will be described with reference to FIG.
[0053]
Reference numeral 41 denotes a cylindrical base material having a fluororesin in the outermost layer, and a cross-sectional view thereof is shown in FIG. 4B. Reference numeral 411 denotes a cylindrical cored bar made of SUS and having an outer diameter of 40 mm. An LTV silicone rubber layer 413 is bonded onto the cored bar 411 via a primer layer 412, and the thickness thereof is 1 mm. The silicone rubber layer was formed by inserting a core metal coated with a primer into a cylindrical mold, injecting uncured silicone rubber of LTV, and heating and curing it. Reference numeral 414 denotes a primer layer for adhering the silicone rubber layer 413 and the surface fluororesin layer, and is composed of a mixture of fluororubber and fluororesin (FEP). The primer layer 414 was obtained by spraying an aqueous paint composed of a mixture of fluororubber and fluororesin by spraying and heating and curing at 200 ° C. for 30 minutes, and its thickness was 25 μm. A fluororesin (FEP) layer 415 is formed on the primer layer 414. The fluororesin layer 415 was prepared by spraying a fluororesin (FEP) dispersion with a spray, drying at 150 ° C. for 20 minutes, and pre-baking at 300 ° C. for 20 minutes, and the thickness was 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 10-point average roughness (Rz). A surface transfer member 42 has a cylindrical shape with an inner diameter of 42.2 mm and a wall thickness of 1 mm. 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 substrate is formed. In this example, the surface roughness of the inner surface of the surface transfer member was 5 μm.
[0054]
This heat-resistant glass has an infrared transmittance of 90% or more, and the infrared transmittance of FEP which is a fluororesin is also about 90%. In addition, a mixture of fluororubber and fluororesin (FEP) was used as a primer for the fusion interface used in this example, but this had an infrared transmittance of 10% or less.
[0055]
The base material 41 that has been pre-heated and baked with the fluororesin coating and the fluororesin is inserted into the surface transfer member 42 and further fixed with a fixing member (not shown) so that the center lines of the base material and the surface transfer member coincide. Integrated. At that time, there is a gap of about 60 μm between the fluororesin-coated substrate 41 and the surface transfer member 42. The base material 41 and the surface transfer member 42, which were integrated as described above and were preheated and fired with the fluororesin coating, and the surface transfer member 42 were heated from the outside of the surface transfer member 42 by the infrared heater 48. In this example, a 3 kw output infrared line heater (parallel light type) having a length (300 mm) substantially the same as that of the base material was disposed about 50 mm away from the surface of the surface transfer member. In this state, the mixture was heated at 3 kw for about 3 minutes. The thermal expansion of the silicone rubber composing the base material is larger than that of the heat-resistant glass composing the surface transfer member, and the surface transfer member (heat-resistant glass) and fluororesin do not absorb much infrared rays, so there is less thermal expansion and the selective fusion interface As a result, the silicone rubber expands further, filling the gap of about 60 μm between the surface transfer member and the substrate, and further creating a state where the fluororesin layer is pressurized with low energy efficiently. Further, the fluororesin (FEP) on the substrate surface layer is softened by infrared heating to form a film. After completion of the above steps, the substrate and the surface transfer member are cooled, and the substrate is extracted from the surface transfer member.
[0056]
  The surface roughness of the fluororesin fired film thus obtained is 4.8 μm in terms of 10-point average roughness (Rz), the surface pattern of the surface transfer member is transferred to the surface of the fluororesin, and fluorine A resin film was formed. Further, 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 terms of resultsReference exampleIt was possible to process in less time than 3. Furthermore, it was possible to prevent rubber deterioration that occurred when the fluororesin was fused onto the silicone rubber.
[0057]
This example is applicable only to special applications because it is difficult to process heat-resistant glass into a cylindrical shape with an accurate inner diameter, and it is easy to break when heated and cooled repeatedly.
[0058]
  Example2
  First of the present invention2This embodiment will be described with reference to FIG.
[0059]
51 is a cylindrical base material having a fluororesin in the outermost layer, and a cross-sectional view thereof is shown in FIG. 5B. Reference numeral 511 denotes a cored bar of a cylindrical base material, which is made of SUS and has an outer diameter of 40 mm. An LTV silicone rubber layer 513 is bonded onto the cored bar 511 via a primer layer 512, and the thickness thereof is 1 mm. The silicone rubber layer was formed by inserting a core metal coated with a primer into a cylindrical mold, injecting uncured silicone rubber of LTV, and heating and curing it. Reference numeral 514 denotes a primer layer for adhering the silicone rubber layer 513 and the surface fluororesin layer, and is composed of a mixture of fluororubber and fluororesin (FEP). The primer layer 514 was obtained by spraying an aqueous paint composed of a mixture of fluororubber and fluororesin by spraying and heating and curing at 200 ° C. for 30 minutes, and its thickness was 25 μm. A fluororesin (FEP) layer 515 is formed on the primer layer 514. The fluororesin 515 was obtained by spraying a fluororesin (FEP) dispersion by spraying, drying at 150 ° C. for 20 minutes, and pre-baking at 300 ° C. for 20 minutes, and the thickness was 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 10-point average roughness (Rz). A surface transfer member 52 has a cylindrical shape with an inner diameter of 42.2 mm and a wall thickness of 0.05 mm. In this embodiment, polyimide 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 substrate is formed. In this example, the surface roughness of the inner surface of the surface transfer member was 5 μm.
[0060]
The infrared transmittance of this polyimide is 90%, and the infrared transmittance of fluororesin (FEP) is also about 90%. In addition, a mixture of fluororubber and fluororesin (FEP) was used as a primer for the fusion interface used in this example, but this had an infrared transmittance of 10% or less.
[0061]
The base material 51 that has been pre-heated and baked with the fluororesin coating and the fluororesin is inserted into the surface transfer member 52 and fixed with a fixing member (not shown) so that the center lines of the base material and the surface transfer member coincide. Integrated. At that time, there is a gap of about 60 μm between the fluororesin-coated substrate 51 and the surface transfer member 52. The base 51 and the surface transfer member 52, which were integrated as described above, and the pre-heated and fired fluororesin coating and the surface transfer member 52 were heated from the outside of the surface transfer member 52 by the infrared heater 58. In this example, a 3 kw output infrared line heater (parallel light type) having a length (300 mm) substantially the same as that of the base material was disposed about 50 mm away from the surface of the surface transfer member. In this state, the mixture was heated at 3 kw for about 3 minutes. At that time, 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 there is less thermal expansion and it is selectively fused. Since the interface is heated, a gap of about 60 μm between the surface transfer member and the substrate is filled, and a state in which the fluororesin layer is pressurized is efficiently created with low energy. Further, the fluororesin (FEP) on the substrate surface layer is softened by infrared heating to form a film. After completion of the above steps, the substrate and the surface transfer member are cooled, and the substrate is extracted from the surface transfer member.
[0062]
The surface roughness of the fluororesin fired film thus obtained is 4.8 μm in terms of 10-point average roughness (Rz), the surface pattern of the surface transfer member is transferred to the surface of the fluororesin, and fluorine A resin film was formed. Further, when the surface of the formed fluororesin layer was observed with an electron microscope, no defects such as cracks were observed on the surface. Of course, it has also prevented the rubber deterioration that occurs when the fluororesin is fused on the silicone rubber.
[0063]
A polyimide film can be easily prepared by preparing a master having a high precision and a desired surface accuracy, and coating, curing and peeling it. Further, since it is excellent in strength at high temperature, durability of repeated use as a surface transfer member can be improved. Furthermore, since it has flexibility, it is easy to handle and suitable for mass production.
[0064]
  Example3
  First of the present invention3This embodiment will be described with reference to FIG.
[0065]
  Example2When processing under the same conditions as above, cooling at −10 ° C. to the hollow part of the core metal for 5 minutes after irradiation from 5 minutes before irradiation with infrared raysAir69 was run at a flow rate of 1 liter per minute. As a result, the base material and the surface transfer member, which had taken about 10 minutes after heating, were cooled, and the time required for extracting the base material from the surface transfer member could be reduced. Moreover, the same fluororesin fired film was obtained even when the infrared output was set at 3.5 kW for 2 minutes and a half. The surface roughness was 4.8 μm in terms of 10-point average roughness (Rz), the surface pattern of the surface transfer member was transferred onto the surface of the fluororesin, and the fluororesin was deposited. Further, when the surface of the formed fluororesin layer was observed with an electron microscope, no defects such as cracks were observed on the surface. Of course, there was no rubber deterioration that occurred when the fluororesin was fused onto the silicone rubber. In other words, as a result, the time until demolding2It could be shortened to a slight extent.
[0066]
  Example4
  First of the present invention4This embodiment will be described with reference to FIG.
[0067]
Reference numeral 71 denotes a cylindrical base material having a fluororesin in the outermost layer, and a cross-sectional view thereof is shown in FIG. 7B. Reference numeral 711 denotes a thermosetting polyimide film having a thickness of 50 μm that forms the base layer of the cylindrical substrate, and its outer diameter is 40 mm. An LTV silicone rubber layer 713 is adhered on the polyimide film 711 via a primer layer 712, and the thickness thereof is 300 μm. The silicone rubber layer was formed by applying a primer or spray-coating a polyimide film with LTV unvulcanized silicone rubber dissolved in toluene and heating and curing it. Reference numeral 714 denotes a primer layer for adhering the silicone rubber layer 713 and the surface fluororesin layer, and is composed of a mixture of fluororubber and fluororesin (FEP). A fluororesin (FEP) layer 715 is formed on the primer layer 714. The fluororesin layer 715 was obtained by spraying a fluororesin (FEP) dispersion by spraying, drying at 150 ° C. for 20 minutes, and pre-baking at 300 ° C. for 20 minutes, and the thickness was 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 10-point average roughness (Rz).
[0068]
Reference numeral 72 denotes a surface transfer member, which has a cylindrical shape with an inner diameter of 42.8 mm and a wall thickness of 0.05 mm. On the inner surface of the surface transfer member, a surface pattern which is coated on the base material and desired to be transferred with the fluororesin is formed. In this example, the surface of the surface transfer member was processed to have a surface roughness of 5 μm. The surface transfer member 72 is made of polyimide.
[0069]
A cylindrical inner surface fixing jig 73 (made of aluminum) having an outer diameter equal to the inner diameter of the film is inserted and integrated into the base material 71 that has been preheated and fired with the fluororesin coating and the fluororesin, and is integrated into the surface transfer member 72. Then, it was fixed and integrated by a fixing member (not shown) so that the center lines of the base material and the surface transfer member coincided. At that time, there is a gap of about 60 μm between the base material 71 covered with the fluororesin tube and the surface transfer member 72.
[0070]
The base 71 and the surface transfer member 72, which were integrated as described above and were preheated and fired with the fluororesin coating, and the surface transfer member 72 were heated from the outside of the surface transfer member 72 by the infrared heater 78. In this example, a 3 kw output infrared line heater (parallel light type) having a length (300 mm) substantially the same as that of the base material was disposed about 50 mm away from the surface of the surface transfer member. In this state, the mixture was heated at 3 kw for about 3 minutes. At that time, the thermal expansion of the silicone rubber composing the base material is larger than that of the polyimide composing the surface transfer member, and the surface transfer member (polyimide) and fluororesin do not absorb much infrared rays, so there is less thermal expansion and it is selectively fused. Since the interface is heated, a gap of about 60 μm between the surface transfer member and the substrate is filled, and a state in which the fluororesin layer is pressurized is efficiently created with low energy. Further, the fluororesin (FEP) on the substrate surface layer is softened by infrared heating to form a film. After completion of the above steps, the substrate and the surface transfer member are cooled, and the substrate is extracted from the surface transfer member.
[0071]
The surface roughness of the fluororesin fired film thus obtained is 4.9 μm in terms of ten-point average roughness (Rz), the surface pattern of the surface transfer member is transferred to the surface of the fluororesin, and fluorine A resin film was formed. Further, when the surface of the formed fluororesin layer was observed with an electron microscope, no defects such as cracks were observed on the surface. Of course, there was no rubber deterioration that occurred when the fluororesin was fused onto the silicone rubber.
That is, the film-like material as described above could be coated with the fluororesin.
[0072]
  Example5
  Example2A fixing roller for a color image forming apparatus was prepared in the same manner as described above.
[0073]
FIG. 8 shows a cross-sectional view of a fixing roller used in the color image forming apparatus. 811 is an aluminum cored bar 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 25 μm fluororubber and fluororesin, and a fluororesin (FEP) layer 815 are formed on the metal core in the same manner as in Example 5. The fluororesin layer 815 was obtained by applying a dispersion of fluororesin (FEP) with a spray, drying at 150 ° C. for 20 minutes, and pre-baking at 300 ° C. for 20 minutes, and the thickness was 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 10-point average roughness (Rz).
[0074]
  The fixing roller prepared by the above method is inserted and fixed to a surface transfer member made of a cylindrical polyimide having an inner diameter of 60.2 mm and a wall thickness of 0.05 mm, and integrated with an infrared heater to fix the surface transfer member. A 3 kw output infrared line heater (parallel light type) having a length (300 mm) substantially the same as that of the substrate from the outside was heated by about 50 mm from the surface transfer member surface for about 3 minutes. At that time, the surface roughness of the inner surface of the surface transfer member was 10 μm in ten-point average roughness (Rz) (Example)5. 1) 5 μm (Example)5. 2) 2 μm (Example)5. 3) were prepared, and a fixing roller was prepared under the above conditions. Table 1 shows the surface roughness and the evaluation as a fixing roller of the fixing roller prepared using each surface transfer member.
[0075]
  Comparative Example 1
  Example5Table 1 shows the surface roughness measurement and image evaluation of the fluororesin-coated fixing roller after preheating and baking without the surface transfer step. However, defects such as cracks and irregularities remained on the surface of the fixing roller.
[0076]
[Table 1]

○: No gloss unevenness
Δ: Some gloss unevenness
×: gloss unevenness
[0077]
From Table 1, it can be seen that any roughness can be formed on the fluororesin surface by adjusting the surface roughness of the inner surface of the surface transfer member. Further, image gloss unevenness which is a problem in the color image forming apparatus can be solved by controlling the roughness of the surface of the fluororesin by the above method.
[0078]
  Example6
  Example2A pressure roller using a film fixing method driven by a pressure roller was prepared in the same manner as described above.
[0079]
FIG. 9 is a cross-sectional view of a pressure roller used in a pressure roller driving film fixing type fixing device. Reference numeral 911 denotes an aluminum cored bar of the pressure roller, and its outer diameter is 10 mm. On the core metal, a 3 mm silicone rubber layer 913, a primer layer 914 made of a mixture of 25 μm fluororubber and fluororesin, and a fluororesin (FEP) layer 915 are formed in the same manner as in Example 5. The fluororesin layer 915 was obtained by applying a dispersion of fluororesin (FEP) with a spray, drying at 150 ° C. for 20 minutes, and pre-baking at 300 ° C. for 20 minutes, and the thickness was 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 10-point average roughness (Rz).
[0080]
  The pressure roller prepared by the method as described above is inserted and fixed to a surface transfer member made of a cylindrical polyimide having an inner diameter of 16.6 mm and a thickness of 0.05 mm, and integrated with an infrared heater to transfer the surface transfer member. A 3 kw output infrared line heater (parallel light type) having a length (300 mm) substantially the same as that of the substrate was heated from the outside of the surface about 50 mm away from the surface of the surface transfer member for about 3 minutes. The surface roughness of the inner surface of the surface transfer member at that time is 25 μm in ten-point average roughness (Rz) (Example)6・ 1) 10μm (Example)6・ 2), 1.5 μm (Example)6-Three types of 3) were prepared, and a fixing roller was prepared under the above conditions. Table 2 shows the surface roughness of the pressure rollers prepared using the respective surface transfer members and the evaluation as the pressure roller.
[0081]
  Comparative Example 2
  Example6In this example, the pre-heated and fired fluororesin-coated pressure roller is not inserted into the surface transfer member.6Infrared heating was performed for about 10 minutes under the same conditions as above to form a fluororesin film. This is the time required to completely form the surface. For this reason, the surface roughness was improved, but the underlying silicone rubber deteriorated, the set fell, and the transportability also deteriorated.
[0082]
The pressure roller was measured for surface roughness and was subjected to image evaluation.
[0083]
[Table 2]

Y: Good
Δ: Partially defective
×: defective
[0084]
From Table 2, it can be seen that an arbitrary roughness can be formed on the surface of the fluororesin by adjusting the surface roughness of the inner surface of the surface transfer member. Further, transfer material conveyance and image defects in a film fixing device driven by a pressure roller can be solved by controlling the roughness of the surface of the fluororesin by the above method.
[0085]
【The invention's effect】
As described above, a fluororesin powder or a water-based paint thereof is coated on a cylindrical or cylindrical base material, the base material is inserted into a cylindrical surface transfer member, and an infrared heater is used from the outside of the surface transfer member. By heating, the surface pattern of the surface transfer member is transferred to the surface of the fluororesin layer by using the difference in the thermal expansion coefficient between the substrate and the surface transfer member and heating the surface while pressing the fluororesin layer with the surface transfer member. As a result, it has become possible to form a crack-free fluororesin without degrading the base material. In addition, an arbitrary pattern or roughness can be imparted to the surface of the fluororesin layer.
[0086]
In addition, when a fixing member that is used in a fixing device of an image forming apparatus and is in direct contact with toner is created using the above method, the surface roughness of the surface fluororesin can be controlled, and uneven gloss of the image can be prevented. Became possible.
[0087]
In addition, when a fixing member used on the driving side of the fixing device of the image forming apparatus is prepared using the above method, the surface roughness of the surface fluororesin can be controlled, and transportability and poor image roughness can be prevented. Became possible.
[Brief description of the drawings]
[Figure 1]Reference example1 is a schematic view of a fluororesin coating method of A, and B is a cross-sectional view of a coated substrate.
[Figure 2]Reference example2A and 2B, A is a schematic view of a fluorine coating method, and B is a cross-sectional view of a coated substrate.
[Fig. 3]Reference example3 is a schematic diagram of a fluororesin coating method, and B is a cross-sectional view of a coated substrate.
FIG. 4 Example1FIG. 4A is a schematic view of a fluororesin coating method, and B is a cross-sectional view of a coated substrate.
FIG. 5 Example2FIG. 4A is a schematic view of a fluororesin coating method, and B is a cross-sectional view of a coated substrate.
FIG. 6 Example3FIG. 4A is a schematic view of a fluororesin coating method, and B is a cross-sectional view of a coated substrate.
FIG. 7 Example4FIG. 4A is a schematic view of a fluororesin coating method, and B is a cross-sectional view of a coated substrate.
FIG. 8 Example5FIG. 3 is a cross-sectional view of the fixing roller.
FIG. 9 Example6It is sectional drawing of a pressure roller.
FIG. 10 is a schematic view of an electrophotographic apparatus.

Claims (8)

(I) A cylindrical surface transfer member having an infrared ray transmittance of 50% or more from a base material having a cylindrical or columnar elastic layer made of silicone rubber and having a fluororesin powder layer on the peripheral surface Step of fixing the base material and the surface transfer member so that their center lines coincide with each other (however, the absorption of infrared rays is such that the surface transfer member ≦ the fluororesin <the surface of the base material) And)
(Ii) Using an infrared heater disposed outside the surface transfer member, while absorbing the surface transfer member obtained in the step (i) and rotating the surface transfer member to which the substrate is fixed , absorption of infrared rays is not less than surface transfer member ≦ fluorine By selectively heating the fusion interface using resin <substrate surface , the elastic resin layer is made elastic by utilizing the difference in thermal expansion coefficient between the elastic layer and the surface transfer member. And a step of heating the surface transfer member under pressure with the surface transfer member to form a fluororesin layer.   The fluororesin coating method according to claim 1, further comprising a step of applying a fluororesin aqueous paint to the peripheral surface of the elastic layer to form the fluororesin powder layer.   The fluororesin coating method according to claim 1, further comprising a step of firing the fluororesin powder on the surface of the substrate by preheating and immobilizing the powder on the peripheral surface of the elastic layer to form the fluororesin powder layer. 2. The fluororesin coating method according to claim 1, wherein the surface transfer member is a tube formed of a material selected from polyimide and glass.   The fluororesin coating method according to claim 1, further comprising a step of cooling the inner surface of the cylindrical base material before and / or during heating.   The fluororesin coating method according to claim 1, wherein the infrared heater is a parallel light type line heater, and is arranged so as to be parallel to the axis of the surface transfer member. The fluororesin coating method according to claim 1 or 6 , wherein the number of infrared heaters arranged outside the surface transfer member is one. Characterized by having a step of forming a fluororesin layer on the peripheral surface of the base material of the multilayer structure having an elastic layer made of silicone rubber with a fluorocarbon resin coating method according to 請 Motomeko 1 to 7 either Manufacturing method of fixing member.

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