JP2012042787A - Sheet-like peeling member of electrophotographic device, method for producing the same, and electrophotographic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet-like peeling member which can be used even in a high-temperature condition and can maintain superior paper peeling property for a long period of time, a method for producing the same, and an electrophotographic device using the sheet-like peeling member.SOLUTION: An end portion 2e of a sheet-like substrate 2 is brought into contact with or arranged close to a fixing member of an electrophotographic device so that a sheet-like peeling member 1 peels a paper from the fixing member. A resin coated film 2d formed by electrostatic coating of a fluororesin is provided on the surface of the sheet-like substrate 2 at a paper-feeding side.

Description

  The present invention relates to a sheet-like peeling member that peels a sheet from a fixing member such as a fixing roller or a fixing belt incorporated in an electrophotographic apparatus such as a copying machine or a laser printer, a manufacturing method thereof, and an electrophotographic apparatus.

  In an electrophotographic apparatus such as a copying machine or a laser printer, an electrostatic latent image formed on a photosensitive drum is developed on a sheet using a developer such as toner, and then the developer transferred to the sheet is fixed to a fixing roller. In addition, there is a fixing unit that is heated and melted by a fixing member such as a fixing belt or the like and is fixed to a sheet by applying pressure. In many cases, the fixing unit is provided with a sheet-like peeling member for smoothly peeling the paper on which the developer is fixed from the fixing member.

  The sheet-like peeling member peels the sheet from the fixing member by bringing the leading end of the sheet-like base material into contact with or close to the fixing member. Here, the contact means that one side of the front side of the sheet-like base material is in line contact with the fixing member in the axial direction thereof, and the proximity means that the base material can be prevented from being wrapped around the fixing member. This means that one side of the front end side is located close to the fixing member. As such a peeling member, in order to improve the paper peelability and prevent the paper from being soiled due to toner adhesion, an increasing number of the peeling members are covered with a fluororesin.

  Examples of the sheet-like release member that covers the tip of the substrate with a fluororesin include, for example, a fluororesin film attached to a substrate with a silicone-based adhesive (see Patent Document 1), and the substrate surface is coated with a fluororesin And a coating film is formed (see Patent Document 2).

JP 2001-235959 A JP 2003-248393 A

  However, in the sheet-like peeling member described in Patent Document 1, when the fixing member becomes a high temperature of 200 ° C. or more with an increase in printing speed, the adhesive strength of the silicone-based adhesive is reduced, and the fluororesin film becomes There is a risk of peeling.

  Further, in the sheet-like peeling member of Patent Document 2, the fluororesin coating film is worn by sliding with the fixing member or the paper, so that the paper may be difficult to peel off or the toner may be easily attached. In particular, in the case of using a color toner having high adhesiveness in recent years, there is a problem that the toner is more easily attached and the paper is contaminated.

  The present invention has been made to cope with such problems, and is a sheet-like release member that can be used under high temperature conditions and can maintain excellent paper peelability over a long period of time, a method for manufacturing the same, and the sheet-like release. An object is to provide an electrophotographic apparatus using a member.

  The sheet-like peeling member of the electrophotographic apparatus of the present invention is a sheet-like peeling member that peels the sheet from the fixing member by bringing the leading end of the sheet-like base material into contact with or close to the fixing member of the electrophotographic apparatus, A resin film is formed by electrostatic coating of fluororesin on at least the sheet-like substrate surface (sheet passing side surface) on the side through which the paper passes.

  The film thickness of the resin film by electrostatic coating of fluororesin is 30 μm to 100 μm. Further, the fluororesin is a tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (hereinafter referred to as PFA).

  In the sheet-like release member of the electrophotographic apparatus of the present invention, a primer film containing a fluororesin is formed on the surface of the sheet-like substrate, and a resin film is formed on the primer film by electrostatic coating of the fluororesin. It is characterized by.

  The fluororesin forming the primer film is at least one selected from PFA, tetrafluoroethylene-ethylene copolymer (hereinafter referred to as ETFE) and tetrafluoroethylene-hexafluoropropylene copolymer (hereinafter referred to as FEP). It is characterized by being one copolymer.

  Further, the primer film is a film formed from a dispersion liquid containing a fluororesin. The dispersion liquid contains at least one resin selected from a polyamide-imide resin, a polyimide resin, and a precursor resin thereof.

  The at least one film selected from a resin film by electrostatic coating and a primer film that constitutes the sheet-like release member of the electrophotographic apparatus of the present invention includes a spherical filler having an average particle diameter of 50 μm to 500 μm. To do. Here, the spherical shape refers to a spherical shape having a ratio of the minor axis to the major axis of 0.8 to 1.0. In the present invention, the average particle diameter represents an average particle diameter measured by a microtrack method.

The spherical filler is contained in 30 to 1800 per 1 cm ² of the resin coating or primer coating surface. The spherical filler is a hollow particulate filler or a solid particulate filler. The hollow particulate filler is any one of a resin balloon, a ceramic balloon, a shirasu balloon or a glass balloon, and the solid particulate filler is a resin bead, ceramic bead, silica bead, glass bead or carbon bead. It is either of these.

  In the electrophotographic apparatus of the present invention, the sheet-like base material constituting the sheet-like peeling member has a curved surface in the thickness direction cross section.

  The electrophotographic apparatus of the present invention is an electrophotographic apparatus having a sheet-like peeling member for peeling a sheet on which a developer is fixed from a fixing member, wherein the sheet-like peeling member is a sheet-like peeling member according to the present invention. It is characterized by being. Further, the electrophotographic apparatus is a full-color electrophotographic apparatus using color toner.

  The method for producing the sheet-like release member of the electrophotographic apparatus of the present invention is such that a dispersion liquid containing a fluororesin is applied to the surface of the sheet-like substrate on the side through which the paper passes and dried, followed by electrostatic coating of the fluororesin It is characterized by performing.

  Since the sheet-like release member of the present invention has a resin film formed by electrostatic coating of fluororesin, it can form a uniform resin film with a thick film thickness. In particular, by setting the film thickness of the resin film to 30 μm to 100 μm and using a resin film mainly composed of PFA, the filler can be easily held in the resin film. As a result, a sheet-like release member having excellent durability can be obtained.

  In the sheet-like release member of the present invention, a primer coating containing a fluororesin is formed on the surface of the sheet-like substrate, and a resin coating by electrostatic coating of the fluororesin is formed on the primer coating. Since the primer coating is formed from a dispersion liquid containing PFA, ETFE, and / or FEP, and this dispersion liquid contains a polyamideimide resin, a polyimide resin, and / or a precursor resin thereof, a sheet form A sheet-like release member having a surface coating excellent in adhesion to the substrate surface and excellent adhesion between the primer coating and the resin coating by electrostatic coating is obtained.

  Since the surface coating of the sheet-like release member of the present invention contains a spherical filler having an average particle diameter of 50 μm to 500 μm, it is more spherical than the film thickness of the resin component in the resin coating formed on the sheet passing side surface of the sheet-like substrate. Since the average particle diameter of the filler may be larger, the spherical filler is formed so as to protrude from the resin coating, and the irregularities of the spherical filler are formed on the surface of the sheet-like substrate, thereby forming a sheet shape The heat dissipation of the substrate is increased. Further, the contact area with the paper is small, and the low friction characteristic with the paper is excellent.

Further, since 30 to 1800 spherical fillers are contained per 1 cm ² of the surface coating, the sheet is not caught on the irregular portions of the spherical filler formed on the surface of the sheet-like base material, and an effect of excellent sheet guide properties is obtained. .

  Also, since the spherical filler is a resin balloon, ceramic balloon, shirasu balloon or glass balloon, it has excellent heat dissipation effect, and since it is resin beads, ceramic beads, silica beads, glass beads or carbon beads, the durability of the resin coating Excellent.

  In addition, since the cross section in the thickness direction of the tip of the sheet-like base material is curved, the surface of the fixing member is damaged even when the fixing member such as the fixing roller or the fixing belt is in a pressure contact state higher than a constant pressure. There is nothing.

  In the electrophotographic apparatus of the present invention, since the above-described sheet-like release member is used as a release member for releasing the paper on which the developer is fixed from a fixing member such as a fixing roller or a fixing belt, It becomes a photographic device. In particular, since the sheet-like release member of the present invention is excellent in releasability from a highly adhesive color toner, it can be suitably used as a full-color electrophotographic apparatus.

  In the method for producing a sheet-like release member of the electrophotographic apparatus of the present invention, a dispersion liquid containing a fluororesin is applied and dried, and then the fluororesin is electrostatically coated. Can be formed.

It is a schematic diagram of a fixing device using a sheet-like release member. 2A is a perspective view showing an example of a sheet-like peeling member, FIG. 2B is an enlarged front view of a portion C in FIG. 2A, and FIGS. 2C to 2F are FIGS. It is the elements on larger scale cut | disconnected by the DD line of (b).

  An example of the sheet-like peeling member and electrophotographic apparatus of the present invention will be described with reference to FIG. FIG. 1 is a schematic view of a fixing device using a sheet-like peeling member. As shown in FIG. 1, the fixing device includes a heater 5 a, a fixing roller 5 that rotates in the direction of arrow A, a pressure roller 6 that contacts the fixing roller 5 and rotates in the direction of arrow B, and a fixing roller. 5 and the sheet-like peeling member 1 disposed in the vicinity of the nip portion 7 formed by contact with the pressure roller 6. The fixing roller 5 is a soft roller having a foam rubber layer inside. The toner image formed on the paper 8 is fixed at the nip portion 7 and becomes a fixed image. The sheet-like peeling member 1 is provided at a position in contact with or close to the fixing roller 5 so that the paper 8 that has passed through the nip portion 7 can be peeled off from the fixing roller 5.

  The sheet-like peeling member 1 will be described in detail with reference to FIG. 2A is a perspective view showing an example of a sheet-like peeling member, FIG. 2B is an enlarged front view of a portion C in FIG. 2A, and FIG. 2C to FIG. ) Are partially enlarged cross-sectional views taken along the line DD in FIG. As shown in FIGS. 2A to 2F, the sheet-like release member 1 includes a metal support member 3 having an attachment portion 4, a sheet-like substrate 2 made of a metal thin plate, and a release layer. And a resin coating 2d. The resin film 2d has a resin film (FIG. 2C) by electrostatic coating of fluororesin, and a primer film 2d ′ between the sheet-like substrate 2 and the resin film 2d (FIG. 2D). )). Further, it includes a hollow particulate filler 2c (FIG. 2 (e)) and a solid particulate filler 2c '(FIG. 2 (f)).

  In the sheet-like substrate 2, the side surface opposite to the side fixed to the support member 3 is the surface on which the sheet passes (sheet passing side surface), and the resin coating 2 d is formed on the sheet passing side surface. .

  One end (fixed end) 2b of the sheet-like substrate 2 is fixed to the support member 3 with an adhesive or welding. The other end of the sheet-like substrate 2 becomes a free end (tip) 2a, and the free end 2a is arranged at a position in contact with or close to the fixing roller 5 to pick up the end portion of the paper 8 peeled off from the fixing roller 5. Take (see FIG. 1).

  The support member 3 is made of metal, and the sheet-like substrate 2 may be made of metal, synthetic resin, or ceramic, but is made of metal such as spring alloy, copper alloy such as stainless steel or brass, or aluminum alloy. It is preferable if it is easy to process and inexpensive.

  The sheet thickness of the sheet-like substrate 2 is preferably in the range of 60 to 500 μm. If the thickness is less than 60 μm, the strength is insufficient, and there is a possibility of being easily deformed during handling. If the thickness exceeds 500 μm, the flexibility of the sheet-like peeling member 1 is impaired, and when the paper hits the sheet-like peeling member 1, the paper cannot be smoothly discharged in the paper discharge direction, causing rebound and causing jamming. There is a risk.

  It is preferable that the surface opposite to the surface through which the sheet of the sheet-like substrate 2 passes (the anti-sheet passing surface) is a smooth surface. Since the sheet-like substrate 2 is integrated with the metal support member 3 by an adhesive or welding, when the back surface of the sheet-like substrate 2 is a smooth surface, the sheet-like substrate 2 is integrated with the support member 3 by an adhesive or welding. Adhesiveness is improved, and the horizontal accuracy of the tip is not particularly deteriorated.

  The sheet-like substrate 2 has a rectangular shape in plan view, and has a contact width that is substantially the same as the axial length of the fixing roller 5. Here, the length substantially the same as the axial length of the fixing roller is at least about half or more of the axial length of the fixing roller, and may be the same as or slightly longer than the axial length of the fixing roller.

  The resin coating 2d is formed on the surface of the sheet-like substrate 2 by electrostatic coating of fluororesin. As the electrostatic coating, any coating method based on the principle of electrostatic atomization and electrostatic adsorption can be used. For example, a method using a grid type, belt type, disk type, or cyclone type static electrostatic coater, a method using an air or airless electrostatic spray coater, a spray electrostatic method or a fluid immersion type powder electrostatic coating And a method using a machine. Among these, a method using an air or airless electrostatic spray coating machine is preferable.

  The resin film 2d is a fluororesin film formed by electrostatic coating. As the fluororesin, any fluororesin that can be melted by heating to form a resin film can be used. For example, PFA, ETFE, FEP etc. are mentioned. Of these, PFA is preferred. By using PFA, it is easy to form a resin film by electrostatic coating, and it is possible to maintain releasability from toner as a sheet-like release member for a long time.

  The film thickness of the resin component of the resin coating 2d is 30 μm to 100 μm, preferably 40 μm to 70 μm. These film thicknesses can be easily formed by a single coating by electrostatic coating. If the film thickness of the resin component of the resin coating 2d is less than 30 μm, the spherical filler 2c described later may not be sufficiently retained. A film thickness of more than 100 μm is not preferable because there is a risk that defects such as cracks and blisters may occur in the process of forming the resin coating 2d.

  As shown in FIG. 2 (d), it is preferable to form a primer coating 2d 'containing a fluororesin on the surface of the sheet-like substrate 2 before forming the resin coating 2d by electrostatic coating. By forming the primer coating 2d ', the adhesion of the resin coating 2d by electrostatic coating can be further improved.

  Examples of the fluororesin constituting the primer coating 2d 'include the above-mentioned PFA, ETFE, FEP and the like. The primer coating 2d ′ is a disperser in which the above-mentioned fluororesin particles made of PFA, ETFE, FEP, etc. are dispersed in a resin solution containing at least one resin selected from polyamideimide resin, polyimide resin, and precursor resins thereof. It can be formed by applying a John liquid and heating.

  The thickness of the primer coating 2d ′ is 5 μm to 20 μm, preferably 7 μm to 15 μm. If the film thickness is less than 5 μm, the retention of the spherical filler described later may not be sufficient. A film thickness of more than 20 μm is not preferable because there is a risk that defects such as cracks and blisters may occur in the primer coating 2d ′ formation process.

  As shown in FIGS. 2 (e) and 2 (f), the sheet-like release member 1 has a hollow particle shape with an average particle diameter of 50 μm to 500 μm on the resin coating 2d and / or primer coating 2d ′ by electrostatic coating described above. It is preferable that a spherical filler which is the filler 2c or the solid particulate filler 2c ′ is included. If the average particle size of the spherical filler is smaller than 50 μm, the heat dissipation effect cannot be expected, and if it is larger than 500 μm, the sheet guide property is lowered.

  As a dispersion liquid for forming a resin coating composition for electrostatic coating or a primer coating 2d ′ for forming a resin coating 2d containing a spherical filler, (1) fluoropolymer powder is used as a resin solvent Or a method of mixing a spherical filler in a resin varnish dispersed in the mixture and stirring uniformly, or (2) mixing a fluoropolymer powder or a spherical filler in a resin solvent and stirring uniformly. Can do.

  Further, in order to prevent a decrease in paper peelability due to static electricity, it is preferable to blend carbon fine powders such as ketjen black and acetylene black into the resin coating composition. The dispersion liquid may be applied to the sheet-passing surface of the sheet-like substrate 2 by various methods such as a dipping method, a roller coating method, a brush coating method, a spray coating method, and a printing coating method. it can.

  Further, when electrostatic powder coating is employed for forming the resin coating 2d, the fluoropolymer powder and the spherical filler can be blended and stirred uniformly to obtain a powder coating.

  In order to keep the horizontal accuracy of the front end portion 2e of the sheet-like substrate 2 high, it is preferable that the portion formed on the front end portion 2e in the resin coating 2d does not contain a spherical filler. In order to form in this way, a resin film that does not contain a spherical filler is formed on the tip 2e in advance, and this part is covered with masking or the like, and then a resin film that contains a spherical filler is formed on the surface of the paper passing side. It can be performed by a method such as forming. Note that the front end portion of the sheet-like base material is a portion that is in contact with or close to the fixing member of the electrophotographic apparatus, and is within a range of about 1 mm to 3 mm from the front end that is in contact with the fixing member in the sheet-like base material. is there.

  It is preferable to make the average particle diameter of the spherical filler larger than the film thickness of the resin component in the resin coating 2d and / or the primer coating 2d '. The spherical filler seems to protrude from the resin coating 2d or the like by making the average particle diameter of the spherical filler that is the hollow particulate filler 2c or the solid particulate filler 2c ′ larger than the film thickness of the resin coating 2d or the like. When the irregularities of the spherical filler are clearly formed on the surface of the sheet-like substrate 2, the heat dissipation of the sheet-like substrate 2 is enhanced (see FIGS. 2 (e) and (f)). Further, the contact area with the paper is small, and the low friction characteristic with the paper is excellent. Even when a resin spherical filler is used, the resin spherical filler does not correspond to the resin component in the resin coating (coating film).

It is preferable to contain 30 to 1800 spherical fillers in the resin coating 2d or the primer coating 2d ′ per 1 cm ² of the resin coating. If the number of spherical fillers is less than 30 per 1 cm ^{2 of the} resin coating, the sheet guide property may be deteriorated. If the number of spherical fillers exceeds 1,800, the irregularities of the spherical filler 2c are not clearly formed, and a heat dissipation effect cannot be expected.

  Examples of the spherical filler include a hollow particulate filler 2c and / or a solid particulate filler 2c '. The heat dissipation effect of the resin coating 2d can be improved by using the hollow particulate filler 2c, and the durability of the resin coating 2d can be improved by using the solid particulate filler 2c '.

  The hollow particulate filler 2c is preferably a resin balloon, a ceramic balloon, a shirasu balloon or a glass balloon. The solid particulate filler 2c 'is preferably resin beads, ceramic beads, silica beads, glass beads, or carbon beads. The hollow particulate filler 2c and the solid particulate filler 2c 'are preferable because they have an excellent heat dissipation effect, can be manufactured with the average particle diameter of 50 μm to 500 μm, and are inexpensive.

  The cross section in the thickness direction of the tip 2e of the sheet-like substrate 2 is preferably a curved surface having no edges (see FIGS. 2C to 2F). By making the thickness direction of the tip part a curved surface, the surface of the fixing member is not damaged even when the pressure member is in a pressure contact state higher than a constant pressure with respect to a fixing member such as a fixing roller or a fixing belt. The curved surface may be machined after the metal sheet-like base material 2 is processed into a predetermined shape, but it is desirable to process by a press cut that can be pressure-formed simultaneously with cutting. The edge on the pressing direction side of the front end portion 2e is formed into an R shape by press sag by press cutting, and the edge on the anti-pressing direction side presses a press plate inclined by 45 ° with respect to the substrate surface in order to prevent generation of minute burrs. Thus, a chamfered portion can be formed, and the distal end portion 2e can be a curved surface. Further, in the metal sheet-like base material, the shape in the thickness direction of the tip portion may be set so that the sagging surface at the time of cutting is set to the paper side and the deburring is only on one side.

  In a full-color electrophotographic apparatus, a polyester-based binder resin having high transparency is used as a binder (binding) resin that is one of the constituent elements of color toner in order to improve color developability. This resin is very sticky. The sheet-like release member of the present invention is formed by forming a resin film mainly composed of a fluoropolymer mixed with a spherical filler on the sheet-passing side surface of the sheet-like base material using electrostatic coating. Since such adhesion of color toner can be prevented for a long period of time, it can be suitably used for a full-color electrophotographic apparatus.

The sheet-like peeling member described above can be manufactured by the following method.
(1) A metal sheet-like base material having, for example, a rectangular shape, which is formed into a predetermined shape that can be adapted to the size of the fixing member of the electrophotographic apparatus is prepared. The sheet-like base material is processed by press cutting that can be pressure-molded simultaneously with cutting, and the thickness direction cross section of the tip part contacting the fixing member of the sheet-like base material is defined as a curved surface without edges. To do.
(2) A dispersion liquid containing a fluororesin is applied to the surface of the sheet-like substrate on the side through which the sheet peeled from the fixing member passes and dried.
(3) The dispersion liquid is prepared by converting at least one copolymer powder selected from PFA, ETFE, and / or FEP into at least one resin solution selected from a polyamideimide resin, a polyimide resin, and a precursor resin thereof. It can be manufactured by dispersing. Furthermore, a spherical filler having an average particle diameter of 50 μm to 500 μm can be dispersed in this dispersion liquid.
(4) By applying and drying on the surface of the sheet-like substrate, a primer coating in which PFA particles, spherical fillers and the like are dispersed in the polyamideimide resin and / or polyimide resin coating can be formed.
(5) Thereafter, a sheet-like release member can be produced by electrostatic coating of a fluororesin, particularly a PFA resin, on the primer coating. A spherical filler having an average particle diameter of 50 μm to 500 μm can be dispersed in the coating liquid during electrostatic coating. The electrostatic coating can easily form a resin film by using an electrostatic method.

  Since the sheet-like release member of the electrophotographic apparatus of the present invention has a resin film formed by electrostatic coating of fluororesin on the paper passing side surface, the film thickness can be increased, and the low friction property with the paper and Excellent durability. For this reason, the fixing member can be suitably used as a sheet-like peeling member of a high-speed, full-color electrophotographic apparatus that is used under conditions where the fixing member has a high temperature of 200 ° C. or higher.

DESCRIPTION OF SYMBOLS 1 Sheet-like peeling member 2 Sheet-like base material 2a Free end (tip)
2b Fixed end 2c Hollow particulate filler 2c 'Solid particulate filler 2d Resin coating 2d' Primer coating 2e Tip 3 Support member 4 Mounting 5 Fixing roller 6 Pressure roller 7 Nip 8 Paper

Claims (19)

A sheet-like peeling member that peels the paper from the fixing member by bringing the leading end of the sheet-like base material into contact with or close to the fixing member of the electrophotographic apparatus,
A sheet-like release member for an electrophotographic apparatus, wherein a resin film is formed by electrostatic coating of a fluororesin on at least the surface of the sheet-like substrate on the side through which the paper passes.   2. The sheet-like release member for an electrophotographic apparatus according to claim 1, wherein the resin film has a thickness of 30 to 100 [mu] m.   The sheet-like release member for an electrophotographic apparatus according to claim 1, wherein the fluororesin is a tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer.   4. A primer coating containing a fluororesin is formed on the surface of the sheet-like substrate, and a resin coating is formed on the primer coating by electrostatic coating of the fluororesin. The sheet-like peeling member of the electrophotographic apparatus according to any one of the above.   The fluororesin forming the primer film is at least one copolymer selected from a tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, a tetrafluoroethylene-ethylene copolymer, and a tetrafluoroethylene-hexafluoropropylene copolymer. The sheet-like peeling member for an electrophotographic apparatus according to claim 4, wherein   6. The sheet-like release member for an electrophotographic apparatus according to claim 4, wherein the primer film is a film formed from a dispersion liquid containing a fluororesin.   The sheet-like release member for an electrophotographic apparatus according to claim 6, wherein the dispersion liquid contains at least one resin selected from a polyamide-imide resin, a polyimide resin, and a precursor resin thereof.   8. The spherical filler having an average particle diameter of 50 μm to 500 μm is included in at least one selected from the resin coating by electrostatic coating and the primer coating. 8. The sheet-like peeling member of the electrophotographic apparatus. 9. The sheet-like release member for an electrophotographic apparatus according to claim 8, wherein 30 to 1800 spherical fillers are contained per 1 cm < ² > of the resin coating or primer coating surface.   10. The sheet-like release member for an electrophotographic apparatus according to claim 8, wherein the spherical filler is a hollow particulate filler or a solid particulate filler.   11. The sheet-like release member for an electrophotographic apparatus according to claim 10, wherein the hollow particulate filler is any one of a resin balloon, a ceramic balloon, a shirasu balloon, or a glass balloon.   11. The sheet-like release member for an electrophotographic apparatus according to claim 10, wherein the solid particulate filler is any one of resin beads, ceramic beads, silica beads, glass beads, and carbon beads.   The sheet-like peeling member of an electrophotographic apparatus according to any one of claims 1 to 12, wherein a cross section in a thickness direction of a tip portion of the sheet-like substrate is a curved surface.   14. An electrophotographic apparatus having a sheet-like peeling member for peeling off a sheet on which a developer has been fixed from a fixing member, wherein the sheet-like peeling member is a sheet-like sheet according to any one of claims 1 to 13. An electrophotographic apparatus which is a peeling member.   The electrophotographic apparatus according to claim 14, wherein the electrophotographic apparatus is a full color electrophotographic apparatus using color toner. In the method for producing a sheet-like release member in which the leading end portion of the sheet-like base material is brought into contact with or close to the fixing member of the electrophotographic apparatus, and the sheet is peeled from the fixing member.
A sheet-like release member for an electrophotographic apparatus, wherein a dispersion liquid containing a fluororesin is applied to the surface of the sheet-like substrate on the side through which the paper passes and dried, followed by electrostatic coating of the fluororesin Manufacturing method.   The dispersion liquid comprises a powder of at least one copolymer selected from a tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, a tetrafluoroethylene-ethylene copolymer, and a tetrafluoroethylene-hexafluoropropylene copolymer, and a polyamide. 17. The method for producing a sheet-like release member for an electrophotographic apparatus according to claim 16, comprising at least one resin selected from imide resins, polyimide resins, and precursor resins thereof.   18. The method for producing a sheet-like release member for an electrophotographic apparatus according to claim 16, wherein the dispersion liquid further contains a spherical filler having an average particle diameter of 50 [mu] m to 500 [mu] m.   18. The electrophotography according to claim 16, wherein the electrostatic coating fluororesin is a tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer including a spherical filler having an average particle diameter of 50 μm to 500 μm. Manufacturing method of sheet-like peeling member of apparatus.

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