JP3673609B2 - Manufacturing method of rotating body for heating - Google Patents

Description

[0001]
  The present invention relates to a method for manufacturing a heating rotator used in a heat fixing apparatus used in an electrophotographic recording apparatus, an electrostatic recording apparatus or the like.
[0002]
[Prior art]
Conventionally, in many of electrophotographic copying machines, printers, and the like, an energy saving type film heating method is increasingly used as a fixing means.
[0003]
A film heating type fixing device has been proposed in, for example, JP-A-63-313182, JP-A-2-157878, 4-44075 to 44083, 4-204980-204984, and the like. The heat-resistant film (fixing film) is brought into close contact with a pressure rotating body (elastic roller) and slid and conveyed, and the pressure-contact nip formed by the heating body and the pressure member is sandwiched between the heat-resistant fixing film. A recording material carrying a fixed image is introduced and conveyed together with a heat-resistant film, and an unfixed image is recorded by heat from a heating body applied through the heat-resistant film and pressure applied at the pressure nip portion. It is a device for fixing as a permanent image on the top.
[0004]
The film heating type heating device can use a low-heat-capacity linear heating element as the heating element and a thin-film low-heat-capacity film as the heating element, which can save power and shorten the wait time (quick start). is there.
[0005]
As another embodiment of the film heating method, Japanese Patent Application Laid-Open No. 7-114276 proposes a fixing method that has an exciting coil inside and magnetically heats a thin metal sleeve or the like by an alternating magnetic field generated therefrom. Yes. Similar to the film heating and fixing method using the low heat capacity linear heating element, this method can also save power and shorten the wait time. At the same time, the heat generating part is closer to the toner image, so that the heat efficiency is high. Have.
[0006]
[Problems to be solved by the invention]
However, the conventional example has the following drawbacks.
[0007]
1. The thin metal film used for magnetic induction heating is required to have flexibility, but because of its poor flexibility, its end is easy to tear due to long-term durability, and the fixing device configuration for preventing it is complicated, There was a drawback that the cost of the apparatus was high. In particular, when a fluororesin is applied and fired to form a fluororesin layer on the metal film, the metal film is thermally deteriorated due to the effects of thermal damage to the metal film during firing, and its strength is impaired. The above problem is remarkable.
[0008]
2. When the film fixing device is applied to a color image forming apparatus, it is necessary to provide an elastic layer on the film as the base layer in order to obtain uniform fixing properties of the solid image portion. In addition, the process of providing a fluororesin layer as a release layer on the surface layer is complicated, and there is a disadvantage that the cost increases.
[0009]
Specifically, since the film has flexibility, when a rubber layer is formed on the surface layer, a liquid rubber layer is applied on the base material by dipping, spray coating or the like, and then heat-cured. Then, a fluororesin dispersion is applied to the surface layer by a method such as spray coating, and the fluororesin layer is baked to obtain a fixing film. However, in such a method, it is difficult to form the rubber layer by a single coating with a thickness of 0.1 mm or more, and the process for forming the rubber layer with a desired thickness takes time. Yes. Further, since a process of applying and baking a fluororesin layer on the surface layer is required, the number of processes is increased, resulting in an increase in cost, and at the same time, there is a disadvantage that the rubber layer and the film layer are thermally deteriorated.
[0010]
The first object of the present invention is to improve the durability of a thin metal film, and to provide a fixing device excellent in durability with a simple device configuration.
[0012]
[Means for Solving the Problems]
The inventors of the present invention have intensively studied to solve the above problems and have reached the present invention. That is, this invention is comprised from the following.
[0015]
Rotating body for heating that forms a fluororesin layer on a thin endless metal film and slides and rotates with an external driving forceManufacturing methodIn
EndlessThe metal film has a thickness of 20 to 100 μm, and when the fluororesin layer is formed on the surface layerFluorine resin firingInEndlessMetal filmBy using a means for releasing the heat from the end of the endless metal film, the temperature of the end,Lower than fluororesin firing temperatureMakeA method of manufacturing a rotating body for heating.
[0027]
DETAILED DESCRIPTION OF THE INVENTION
  The present invention is a heating rotating body in which a fluororesin layer is formed on a thin endless metal film and is slidably rotated by an external driving force.Manufacturing methodIn
EndlessThe metal film has a thickness of 20 to 100 μm, and when the fluororesin layer is formed on the surface layerFluorine resin firingInEndlessMetal filmBy using a means for releasing the heat from the end of the endless metal film, the temperature of the end,Lower than fluororesin firing temperatureMakeIt is a manufacturing method of the rotating body for heating characterized by this.
[0028]
The fixing film 1 is an endless metal film having a thickness of 20 to 100 μm, preferably 30 to 70 μm. The material is not limited as long as the material is a metal, but a metal made of a ferromagnetic material such as Ni, Sus, iron, and Co is preferable. .
[0029]
The fluororesin used in the present invention is not particularly limited, and examples thereof include PTFE and PFA.
[0036]
[Action]
  In particular, the present invention can prevent thermal deterioration of a metal film during baking of a fluororesin, can maintain the strength of the metal film, and can provide a manufacturing method that can easily avoid the problem of tearing of the metal film due to durability. .
[0038]
【Example】
  (First reference example)
  FIG. 1 illustrates the present invention.Reference exampleIt is a schematic sectional drawing of the heat fixing apparatus for demonstrating this. The fixing film 1 that is a rotating body for heating is an endless metal film having a thickness of 20 to 100 μm, preferably 30 to 70 μm, and the material is preferably a metal made of a ferromagnetic material such as Ni, Sus, iron, Co, or the like. On the inner surface of the fixing film, a magnetism generating means comprising an exciting coil 12 and a core 13 such as ferrite and a high heat resistant resin (liquid crystal polymer, phenol resin, polyphenylene fluoride resin (PPS), etc.) stay 14 for supporting the film, A metal film 1 having a temperature detecting element 16 such as a thermistor for detecting the temperature of the peripheral surface and generating an alternating magnetic field in a magnetic field generating means by a power source (not shown)._-1Magnetic induction heating is performed by generating eddy currents and generating heat by the Joule heat. The outer peripheral surface of the metal film is a release layer, a fluororesin layer 1_-2(PTFE, PFA, etc.) is coated to prevent toner offset on the recording material.
[0039]
The pressure roller 15 is a core 15 made of Sus, iron, Al, etc._-1An elastic layer 15 such as silicone rubber or fluororubber_-2Furthermore, a fluororesin layer 15 as a release layer is further formed thereon._-3(PFA chives, PFA or FEP code layers), and a nip is formed between the fixing film and the fixing film at a predetermined pressure by a pressing means (not shown).
[0040]
In the heat fixing device, the pressure roller 15 is driven by a driving means (not shown), and the fixing film 1 is driven. The fixing film 1 has a margin in the circumferential length with respect to the resin stay 14. Rotate in a so-called tension-free state. At this time, the buckling of the film is prevented by the rigidity of the film itself against the offset force acting on the fixing film.
[0041]
A method for producing a metal film used in the fixing device having the above configuration will be described. For materials that can be electroformed such as Ni as a metal film, an electroforming method is applied, and a cylindrical matrix such as Sus or copper is used in an electroforming solution such as nickel sulfamate, nickel sulfate, or nickel acetate. A thin metal film can be obtained by forming a Ni layer having a predetermined thickness by electroplating and demolding. Ni-Co alloy and Ni-iron alloy films can be obtained in the same manner. Next, an adhesive layer is applied to the surface of the Ni film, and PFA powder is electrostatically coated or sprayed with PFA and PTFE dispersion, and then fired to form a fluororesin layer having a predetermined thickness. Here, the fluororesin layer is fired as follows.
[0042]
  In general, the fluororesin is fired by heating the non-fired product at a temperature equal to or higher than the melting point of the fluororesin (370 to 420 ° C.) for about 10 to 40 minutes to form a fluororesin film.Reference exampleWhen a thin metal film is used as described above, there is a drawback in that if the metal film is placed at such a high temperature for a long time, the metal film is thermally deteriorated and brittleness is increased. thereReference exampleThen, a firing method is employed in which the metal film is fired in a short time so as not to be exposed to a high temperature for a long time. Specifically, a metal film coated with the fluororesin layer is put in a high temperature furnace at 450 to 600 ° C. for about 10 seconds to 5 minutes, and then rapidly cooled by means such as water cooling to melt and solidify the fluororesin layer. The Ni layer employs a firing method that is not thermally damaged.
[0043]
The results of applying the metal film thus obtained to the fixing device are shown below.
As the metal film, a Ni film formed by an electroforming method with an inner diameter of φ25 and a thickness of 50 μm was sprayed thereon, and a PTFE dispersion with a thickness of 20 μm was spray-coated thereon, and then placed in a furnace having an atmospheric temperature of 500 ° C. for 3 minutes. (The maximum temperature of the metal film itself during this heating was about 380 ° C., and was maintained at the same temperature for about 1 minute.) Next, the fixing film was immediately cooled by putting it in a 20 ° C. water bath. Obtained. The pressure roller has an outer diameter of 20 mm, the thickness of the elastic layer made of silicone rubber is 5 mm, the outer diameter of the core metal made of iron is 10 mm, and the outermost layer is provided with a PFA tube having a thickness of 50 μm. When applied to a fixing device of 100 mm / sec and a total pressure of 10 kg, the fixing film was not damaged even after the endurance of 100,000 sheets.
[0044]
Such a baking method changes the thermal damage of the metal film and affects the durability. In order to clarify this condition, the metal film is heated alone, the degree of influence on the durability is compared by the heating history, and the heat history indicating the durability equivalent to 100,000 sheets in the idling experiment is the metal film. The temperature of the inner peripheral surface of was 10 minutes at 350 ° C., 9 minutes at 400 ° C., and 8 minutes at 450 ° C. In this temperature range (temperature range where fluororesin can be baked), the thermal damage of the metal film depends on the product of the metal film temperature and its heating time, and is sufficient if it does not receive a heat quantity of 3500 (° C · min) or more It was found to be durable.
[0045]
  still,Reference exampleThe metal film whose surface layer described above is coated with a fluororesin can be placed in a furnace at an atmospheric temperature of 500 ° C. for 3 minutes, and then placed in a water bath maintained at room temperature to obtain a sufficiently fired fluororesin film. At the same time, the temperature of the metal film itself rose only up to 380 ° C., and the time kept at that temperature was about 1 minute.
[0046]
The melting point of the metal film is sufficiently higher than the firing temperature (1450 ° C. for nickel). However, according to experiments, when the metal film itself receives a thermal history exceeding 500 ° C., it rapidly increases regardless of the time. It was also confirmed that it deteriorated.
[0047]
On the other hand, it was put into a general firing method, that is, an oven having an atmospheric temperature of 400 ° C. for 25 minutes (note that the temperature of the metal film itself rose to 370 ° C. and was maintained at the same temperature for about 15 minutes). When the fixing film obtained by air cooling in a room temperature atmosphere was durable under the same conditions, it was observed that cracks occurred at the end of the fixing film at the time of 30,000 sheets.
[0048]
Thus, by performing the baking method of the fixing film by rapid heating and rapid cooling, a fixing film having excellent durability can be provided without causing thermal damage to the thin metal film.
[0049]
  (First embodiment)
  In this example,Reference Example 1Another manufacturing method (baking method) of the fixing film applied to the heat fixing apparatus will be described.
In the heat fixing apparatus as in this embodiment, the metal film is damaged due to durability. Since the shifting force always acts on the fixing film, either the right or left side of the fixing film is always a thrust member (PPS, A heat-resistant resin such as a liquid crystal polymer), and a rubbing force is generated there, and a crack is generated at the end. Therefore, it was also tested whether the same effect could be obtained by increasing the metal film strength only at the edges (reducing thermal damage).
[0050]
  The Ni electroformed film 20 isFirst reference exampleThen, PTFE dispersion 21 was applied in a thickness of 20 μm, and then a fluororesin was baked in the state shown in FIG. 2 to obtain a fixing film. This firing method is a firing method in which the end portion of the Ni electroformed film is supported by a metal rod 22 having a relatively large heat capacity, and the other center portion is heated at a high temperature while only the end portion is air-cooled. After firingFirst reference exampleAs with, quench by water cooling. At this time, the fluororesin coating part was heated at 350 to 400 ° C. for about 12 minutes, but the film end supported by the metal rod was within the temperature range of 200 to 250 ° C. As a result, only the end part was A fixing film which is not damaged by heat can be manufactured.
(Of course, it is preferable that the entire heat history of the fluororesin-coated part is 3500 (° C./min) or less, but in this example, an example in which a part of the resin is heated to a low temperature as in the prior art is shown. .)
  The fixing film 20 thus obtained isFirst reference exampleAs a result, the fixing film 20 was not particularly damaged by the durability of 100,000 sheets.
[0051]
Thus, it has been found that sufficient effects can be obtained by maintaining only the edge of the fixing film at a low temperature and baking.
[0052]
  (Second embodiment)
  Figure 3Second embodimentIt is a schematic sectional drawing of the heat fixing apparatus for demonstrating this.
In this embodiment, the inner surface of the fixing film 30 is rotationally driven by the driving roller 31 and the tension roller 32, and the pressure roller 35 is driven by the fixing film 30.
[0053]
The fixing film 30 is provided with magnetic field generating means comprising a core made of a magnetic member such as an exciting coil 33 and ferrite 34 in the same manner as in the above embodiment, and is driven by a power source (not shown) to generate an alternating magnetic field. An eddy current is generated in the fixing film to generate heat. At this time, the thermistor 37 detects the temperature of the inner peripheral surface of the fixing film and suppresses the generation of an alternating magnetic field. There is a stay 36 made of heat-resistant resin (PPS, liquid crystal polymer, phenol resin, etc.) with high thermal insulation on the inner surface of the fixing film to support the core and coil at the same time as forming the nip for fixing. A nip is formed between the pressure roller 35 and the pressure roller 35. Pressure roller is cored bar 35_-1Elastic layer 35 on (iron, Sus, Al, etc.)_-2(Silicon rubber, fluororubber, etc.) is formed, and the outermost layer is a fluororesin layer 35._-3Is provided.
[0054]
  In this embodiment, the fixing film is formed on a Ni electroformed film having an inner diameter of 40 mm and a thickness of 50 μm.First Reference Example, First ExampleUsing a fixing film obtained by firing a fluororesin layer in the same manner as described above, the outer diameter of the pressure roller is 20 mm, the thickness of the elastic layer made of silicone rubber is 5 mm, the outer diameter of the core metal made of iron is 10 mm, and the outermost layer In this example, a PFA tube having a thickness of 50 μm was used, and when applied to a fixing device having a paper feed speed of 100 mm / sec and a total pressure of 10 kg, neither fixing film was damaged by the durability of 100,000 sheets. . on the other hand,First reference exampleWhen the fixing film obtained by the general baking method shown in the description of the above was durable under the same conditions, it was observed that cracks occurred at the end of the fixing film at the time of 20,000 sheets.
[0055]
  In the fixing film in which tension is applied from the inner surface as described above,First reference exampleAs in the case of the present invention, there was a problem that cracks occurred from the end due to durability, but the fixing film excellent in durability by a method of baking a fluororesin while maintaining only the end at a low temperature as in the present invention. It was found that can provide.
[0056]
(Second reference example)
Figure 4Second reference exampleIt is a schematic sectional drawing of the heat fixing apparatus for demonstrating this.
The fixing film 41 has a heat resistant resin film 41 such as a polyimide film having a thickness of 20 to 70 μm as a base layer._-1And an elastic layer 41 thereon_-2The silicone rubber or fluororubber layer is formed with a thickness of 0.3 to 1.5 mm, and the outermost layer is a fluororesin layer 41._-3Is formed with a thickness of 20 to 50 μm. Inside the fixing film, a plate-like heater 42 in which a heating resistor is linearly formed on a ceramic substrate such as alumina is provided at the nip position, and heat is generated by supplying electric power. A thermistor 43 is provided on the back side of the resistance heating element on the ceramic substrate of the heater to monitor the heater temperature and control power supply. The heater is supported by a heat-resistant heat-resistant resin stay 44 (PPS, liquid crystal polymer, phenol resin, etc.), the resin stay is further reinforced by a metal stay 46, and the fixing film is loosely fitted to the stay and rotates without tension. It has a configuration. The pressure roller 45 is a hollow core 45 made of Al, iron or the like._-1Is provided with a heating member 47 such as a halogen heater, and an elastic layer 45 such as silicone rubber or fluororubber on the cored bar._-2And a fluororesin layer 45 as a release layer on the outermost layer._-3Is provided. The pressure roller is pressurized by a pressure means (not shown) to form a nip with the fixing film, and at the same time, a rotational driving force is transmitted by an external driving means.
[0057]
The heat fixing apparatus having such a configuration has an elastic layer on the fixing film, so that a uniform pressure is applied to the toner image on the recording material. In particular, it is suitable for a fixing device for a color image forming apparatus having a lot of solid images. In order to obtain such an effect, the thickness of the elastic layer of the fixing film is preferably 0.3 mm or more, and from the viewpoint of heat conduction, it is preferably 1.5 mm or less.
[0058]
The fixing film can be obtained by a manufacturing method as described below. The polyimide film is made of Sus in polyimide enamel and a round bar mold coated with PTFE on the copper surface as a release layer. The mold is pulled up at a constant speed, and then the imidization reaction is accelerated and cured by a heating process. After the polyimide film is formed on the round bar in this way, it is inserted into the center of a hollow cylindrical mold having a fluororesin tube (PFA etc.) on the inner peripheral wall surface in advance, and between the fluororesin tube and the polyimide film. Liquid rubber is poured into the furnace, the hollow cylindrical mold is put into a furnace, the rubber layer is heated and cured, and then the mold is removed in the order of a round bar mold and a hollow cylindrical mold to obtain a fixing film of a desired size. it can.
[0059]
  By the manufacturing method as described above, the thickness of the rubber layer can be freely controlled to a thickness of 0.3 mm or more, the thickness can be easily controlled by simply injecting rubber into the mold, and the injection time is also long. It's short. Furthermore, since the polyimide film before being removed from the cylindrical mold A is inserted into the cylindrical mold B, there is no risk of deformation of the polyimide film, and the rubber thickness between the polyimide film and the fluororesin tube is determined by the mold accuracy and uniform. A rubber layer with a sufficient thickness is formed. Furthermore, the polyimide film of the base layer is only heated when the silicone rubber is cured, and the temperature at that time is about 130 to 160 ° C. at most, and it may be said that there is almost no influence of heating on the polyimide film. In the conventional example, the process of coating the silicone rubber and the process of coating and baking the fluororesin layer are required, so that not only the number of processes is increased, but also the polyimide layer is heated at a high temperature (300 to 400 ° C.). In some cases, gas may be generated from the polyimide layer, and bubbles may be generated between the silicone rubber layer and the polyimide layer.Reference exampleIn this manufacturing method, such a problem does not occur, and the fixing film can be provided at a low cost because the number of steps is small and the yield rate is high.Reference exampleThen, a fixing film in which a silicone rubber layer having a thickness of 0.5 mm and a PFA tube layer having a thickness of 30 μm are formed on a polyimide film molded to have an inner diameter of φ30 and a thickness of 50 μm by the above manufacturing method. Using a 2 mm Al cored bar with a 3 mm thick silicone rubber layer and a 50 μm thick PFA tube layer on the surface, pressurizing with a total pressure of 20 kg and applying it to a heat fixing device for a color laser beam printer A uniform solid image could be obtained, and the durability was not affected by film cracking or the like even when 100,000 sheets of A4 size paper were passed.
[0060]
  (Third reference example)
FIG.Third reference exampleIt is a schematic sectional drawing of the heat fixing apparatus for demonstrating this.
The fixing film 51 has a base layer of a metal film 51 such as Ni having a thickness of 20 to 70 μm._-1And an elastic layer 51 thereon_-2The silicone rubber or fluororubber layer is formed with a thickness of 0.3 to 1.5 mm, and the outermost layer is a fluororesin layer 51._-3Is formed with a thickness of 20 to 50 μm. Inside the fixing film 51, an exciting coil 52 and a core 53 are provided at a nip position, and the metal film 51 is driven by a power source (not shown) to generate an alternating magnetic field._-1An eddy current is generated inside, and heat is generated by the Joule heat. Metal film 51_-1A thermistor 56 is provided on the inner peripheral surface to monitor the metal film temperature and control the alternating magnetic field supply. The exciting coil 52 and the core 53 are supported by a heat-resistant heat-resistant resin stay 54 (PPS, liquid crystal polymer, phenol, etc.), the resin stay is reinforced by a non-magnetic metal stay 57, and the fixing film 51 is loosened by the stay 54. It is configured to rotate freely without tension. The pressure roller 55 is a hollow core 55 made of Al, iron or the like._-1Heated by a heating member 58 such as a halogen heater, or an induction coil provided inside as well as a fixing film, induction heating by an alternating magnetic field generated by the core, and the cored bar itself generates heat. An elastic layer 55 such as silicone rubber or fluoro rubber is disposed on the core metal._-2And a fluororesin layer 55 as a release layer on the outermost layer._-3Is provided. The pressure roller 55 is pressurized by a pressure unit (not shown) and forms a nip with the fixing film, and at the same time, a rotational driving force is transmitted by a driving unit from the outside.
[0061]
  The heat fixing apparatus having such a configuration has an elastic layer on the fixing film, so that a uniform pressure is applied to the toner image on the recording material. In particular, it is suitable for a fixing device for a color image forming apparatus having a lot of solid images. In order to obtain such an effect, the thickness of the elastic layer of the fixing film is preferably 0.3 mm or more.Second reference exampleCompared to the above, since the heat generating portion is close to the toner image, the thickness of the rubber layer can be relatively increased.
[0062]
  The fixing film 61 can be obtained by the following manufacturing method. Metal film is the firstReference exampleA metal film having a desired thickness is formed by growing an Ni, Ni-Co alloy, or Ni-iron alloy by electroplating on the cylindrical mold A made of Sus and copper as described above. . After the metal film is formed on the cylinder A in this manner, the metal film is inserted into the center of the cylinder B having a fluororesin tube (PFA or the like) along the inner peripheral wall surface in advance. Liquid rubber is poured in between, the mold B is put into a furnace, the rubber layer is heated and cured, and then the mold B is removed in the order of the cylinder B and the cylinder A to obtain a fixing film of a desired size. it can. By the manufacturing method as described above, the thickness of the rubber layer can be freely controlled to a thickness of 0.3 mm or more, the thickness can be easily controlled by simply injecting rubber into the mold, and the injection time is also long. It's short. Furthermore, since the metal film before being removed from the cylinder A is inserted into the cylinder B, there is no risk of deformation of the metal film, and the rubber thickness between the metal film and the fluororesin tube is determined by the accuracy of the mold and is uniform. A rubber layer with a sufficient thickness is formed. Further, the metal film of the base layer is only heated when the silicone rubber is cured, and the temperature at that time is at most about 130 to 160 ° C., and it may be said that there is almost no influence of the heating on the metal film. In the conventional example, the process of coating the silicone rubber, the process of coating the fluororesin layer, and the process of firing are required. Therefore, not only the number of processes is increased, but the high temperature (300 to 400 ° C.) during the fluororesin coating is a metal film. The metal film was heat damaged to be added to the layerReference exampleIn this production method, such a problem does not occur, and a low-cost fixing film having excellent durability can be provided because the number of steps is small.
[0063]
  Reference exampleThen, a fixing film in which a 0.5 mm thick silicone rubber layer and a 30 μm thick PFA tube layer are formed on the Ni film molded to have an inner diameter of 30 mm and a thickness of 50 μm by the above manufacturing method. Using a 2 mm Al core metal with a 3 mm thick silicone rubber layer and a 50 μm thick PFA tube layer on the surface, pressurizing with a total pressure of 20 kg and applying it to a heat fixing device for a color laser beam printer A uniform solid image could be obtained, and the durability was not affected by film cracking or the like even when 100,000 sheets of A4 size paper were passed.
[0064]
【The invention's effect】
As described above, according to the present invention, the optimum metal film of the magnetic induction gold method having high thermal efficiency and excellent quick start property is not exposed to an excessively high temperature when the fluororesin is fired. Deterioration could be prevented, and the durability could be improved.
[0065]
Furthermore, it is possible to provide a method for producing a fixing film having an inexpensive elastic layer for using a heat fixing device for a color image forming apparatus as a film fixing device having high thermal efficiency. A fixing film for a color image forming apparatus that can achieve the above-described process and a heat fixing apparatus having the same can be provided.
[Brief description of the drawings]
[Figure 1]First reference exampleFIG.
FIG. 2 of the present inventionOf the first embodimentIt is a figure for demonstrating the manufacturing method of the rotary body for a heating.
FIG. 3 of the present inventionSecond embodimentFIG.
[Fig. 4]Second reference exampleFIG.
[Figure 5]Third reference exampleFIG.

Claims (1)

In the method of manufacturing a rotating body for heating that forms a fluororesin layer on a thin endless metal film and slides and rotates by an external driving force,
The endless metal film thickness thereof is 20 to 100 [mu] m, the temperature of the end portion of the endless metal film during fluorine resin baking in forming the fluororesin layer on the surface layer, the heat from the end of the endless metal film by using a means of escape, the manufacturing method of the heating rotating body than fluororesin baking temperature, characterized in that make lower.

Images