JP2006133653A - Slide member for device for fixing electrophotographic image - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a slide member (low-friction sheet) for a device for fixing electrophotographic image, the sliding surface of which has excellent wear resistance as well as a favorable friction coefficient in an initial stage. <P>SOLUTION: In the slide member for a device for fixing electrophotographic image, at least a sliding surface thereof comprises a nonporous sheet obtained by blending 60-94 wt.% of polytetrafluoroethylene resin, 5-30 wt.% of polyimide resin and 1-10 wt.% of one or more kind of inorganic fine particles selected from the group composed of molybdenum disulfide, boron nitride and graphite, and surface roughness Ra of the sliding surface is in a range of 5.0-50.0 μm. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing device used to heat and pressure-fix an unfixed image in an electrophotographic apparatus such as a copying machine, a printer, and a facsimile, and in particular, for fixing to form a nip portion through which a recording medium passes. The present invention relates to a sliding member (sheet-like sliding member) for an electrophotographic image fixing apparatus interposed between a pressing member that presses from the inside of a tubular body toward the fixing member and the fixing tubular body.

  In electrophotographic image formation in printers, copiers, facsimiles, etc., it is necessary to go through a process of fixing a toner image by heating and pressurizing a recording paper or the like on which an unfixed toner image is formed through an image fixing device. is there. As such an image fixing apparatus, a belt nip method using a heat resistant plastic film tubular body is known. In this belt nip system, a film tubular body is circumscribed on a driving type fixing roll, an elastic pressing member is inscribed against the film tubular body portion of the circumscribed portion, a sliding sheet is installed therebetween, and oil is supplied. The nip portion is formed between the fixing roll and the film tubular body, and the toner image is fixed while the recording paper passes through the nip portion.

  In such a belt nip method, in order to guarantee an excellent fixed image and fixability, it is necessary to prevent a slip between the fixing roll and the recording paper and a slip between the recording paper and the film tubular body. It is essential. Therefore, when the friction coefficient between the fixing roll and the recording paper is μa, the friction coefficient between the recording paper and the film tubular body is μb, and the friction coefficient between the film tubular body and the elastic pressing member is μc, at least , Μa> μc, and μb> μc. In order to reduce the friction coefficient μc in this way, conventionally, a coating layer (low friction sheet) made of a glass fiber sheet coated and baked with a fluororesin is coated on the elastic pressing member, and the coating layer and the film tubular body It has been proposed that a lubricant be interposed between them (for example, Patent Document 1 and Patent Document 2).

  It has been found that the following points are not sufficient for such a coating layer (low friction sheet) made of a glass fiber sheet coated and fired with a conventionally used fluororesin.

  That is, the outermost coated fluororesin layer is worn out over a long period of use, and the glass fiber sheet as the reinforcing base material is exposed, and this surface wears the inner surface of the belt, resulting in belt reliability. Damage, accumulation of wear powder, direct contact between the glass fiber surface and the belt inner surface, the friction coefficient between the inner peripheral surface of the film tubular body (endless belt) and the surface of the low friction sheet increases, and the driving torque is increased. growing. As a result, the burden on other mechanical parts increases, causing damage to the apparatus. Further, since the low friction sheet inhibits the rotation of the film tubular body, wrinkles are formed on the recording medium such as recording paper between the film tubular body and the fixing roll.

Therefore, a technique has been proposed in which the sliding surface of the low friction sheet is formed of a non-porous heat resistant resin layer (Patent Document 3). However, in such a technique, the sliding surface of the low friction sheet has a large static friction coefficient, so the load at the time of starting is large, and a sufficiently small friction coefficient cannot be maintained for a long time, or even if it can be maintained, it is resistant to wear. Sex was not enough. Therefore, the friction coefficient of the sliding surface of the low friction sheet increases during long-term use, and the frictional force between the inner peripheral surface of the film tubular body and the surface of the low friction sheet increases, resulting in damage to the apparatus as described above. And problems such as wrinkle formation on the recording medium occurred.
JP-A-10-213984 JP 2001-249558 A JP 2004-206105 A

  SUMMARY OF THE INVENTION An object of the present invention is to provide an electrophotographic sliding member (low friction sheet) having not only a sufficiently small friction coefficient on a sliding surface but also excellent wear resistance.

In the present invention, at least the sliding surface is
60-94% by weight of polytetrafluoroethylene resin;
5 to 30% by weight of polyimide resin; and 1 to 10% by weight of one or more inorganic fine particles selected from the group consisting of molybdenum disulfide, boron nitride and graphite
And a sliding member for an electrophotographic image fixing apparatus, wherein the sliding surface has a surface roughness Ra in the range of 5.0 to 50.0 μm.

  The sliding member (low friction sheet) for the electrophotographic image fixing device of the present invention has a sufficiently small static friction coefficient, and therefore has a small load at start-up and has excellent wear resistance, so that it can be used for a long time. Become. Also, the coefficient of dynamic friction is small, and problems such as damage to the apparatus and formation of wrinkles on the recording medium are unlikely to occur during long-term use.

The electrophotographic image fixing device sliding member (sheet-like sliding member) of the present invention is suitable for use in a fixing device provided with a fixing tubular body.
Hereinafter, the sliding member for an electrophotographic image fixing device of the present invention will be described with reference to FIG. 1 showing a schematic configuration diagram of an example of a charging device suitable for using the sliding member.

  In the fixing device shown in FIG. 1, a resin film tubular body 2 (fixing tubular body) is circumscribed on a driving type fixing roll 1 (driving member), and a support 31 is provided to the resin film tubular body 2 portion of the circumscribed portion. A pressing member A, which is mounted with an elastic body 32 and covered with a sheet-like sliding member 33 of the present invention and integrated, is inscribed. The fixing roll 1 is heated to a predetermined temperature by a heating source 11, and a nip portion n is formed between the fixing roll 1 and the resin film tubular body 2. The fixing roll 1 and the resin film tubular body 2 are rotated in the directions of arrows, respectively, and the toner image 41 is fixed while the recording medium 4 passes through the nip portion n.

  A lubricant is present on the sliding surface of the sheet-like sliding member 33 with respect to the resin film tubular body 2.

  It is important that the lubricant has excellent lubricity, but this index has kinematic viscosity. When used in a fixing device, it is necessary to consider heat resistance, volatility, and the like. In this respect, silicone oil is preferable, and amino-modified silicone oil having superior wettability is more preferable. In addition, when superior performance is required due to heat resistance, it is also preferable to use methylphenyl silicone oil.

  Specific examples of lubricants that can be applied include grease, dimethyl silicone oil, dimethyl silicone oil with organic metal salt addition, dimethyl silicone oil with hindered amine addition, dimethyl silicone oil with organic metal salt and hindered amine addition, methyl phenyl silicone oil, organic Examples include metal salt-added amino-modified silicone oils, hindered amine-added amino-modified silicone oils, and the like.

  The sheet-like sliding member 33 is a sliding member for an electrophotographic image fixing device of the present invention, and at least the sliding surface is made of a specific non-porous sheet. Here, the sliding surface means a sliding contact surface with the resin film tubular body 2 in the sheet-like sliding member 33. Non-porous means that there is no hole which is impregnated with the lubricant. In the porous sheet, the lubricant (such as oil) intervening on the sliding surface cannot be retained for a long period of time, which causes damage to the apparatus.

In the present invention, the non-porous sheet is
60-94 wt% polytetrafluoroethylene resin (PTFE), preferably 70-90 wt%;
5 to 30% by weight of polyimide resin (PI), preferably 8 to 25% by weight; and 1 to 10% by weight of one or more inorganic fine particles selected from the group consisting of molybdenum disulfide, boron nitride and graphite, preferably 3-8% by weight
It is blended.

  By combining PTFE, PI and the above-mentioned inorganic fine particles in a specific amount, the sliding surface of the sliding member not only has a good coefficient of friction in the initial stage, but also exhibits excellent wear resistance. That is, by adding PI, the wear resistance can be improved without increasing the friction coefficient of the sliding surface. Thereby, abrasion damage of the resin film tubular body can be effectively prevented, and the sliding surface can maintain a good friction coefficient over a long period of time. Further, by blending the inorganic fine particles, not only the wear resistance can be further improved and the friction coefficient can be effectively reduced, but also the retention of the lubricant can be improved.

If the blending amount of PTFE is too small or the blending amount of PI is too large, the friction coefficient of the sliding member increases and the frictional force between the inner peripheral surface of the film tubular body and the sliding member surface increases. Wrinkles are formed on the recording medium between the resin film tubular body and the fixing roll, or the apparatus is damaged. If the blending amount of PTFE is too large or the blending amount of PI is too small, the wear resistance deteriorates, the friction coefficient of the sliding surface of the sliding member increases during long-term use, and the inner peripheral surface of the film tubular body The frictional force between the surface of the sliding member and the surface of the sliding member increases, causing problems such as damage to the apparatus and formation of wrinkles on the recording medium as described above.
If the blending amount of the inorganic fine particles is too small, the friction coefficient of the sliding member is increased and the frictional force between the inner peripheral surface of the film tubular body and the surface of the sliding member is increased, and the resin film tubular body and the fixing roll In the meantime, the recording medium is wrinkled or the apparatus is damaged. If the amount of inorganic fine particles is too large, the wear resistance deteriorates, the friction coefficient of the sliding surface of the sliding member increases during long-term use, and the gap between the inner peripheral surface of the film tubular body and the sliding member surface This increases the frictional force and causes problems such as damage to the apparatus and formation of wrinkles on the recording medium.

  Commercially available PTFE can be used, for example, Teflon (R) 7-J (manufactured by Mitsui DuPont Fluorochemical Co., Ltd.) or full-on PTFE G190 (manufactured by Asahi Glass).

  When PFA or the like is used instead of PTFE, the friction coefficient of the sliding member is increased, the frictional force between the inner peripheral surface of the film tubular body and the surface of the sliding member is increased, and the resin film tubular body and the fixing roll Problems such as formation of wrinkles on the recording medium.

PI is thermosetting, and for example, a reaction product of biphenyltetracarboxylic anhydride or / and pyromellitic anhydride and oxydianiline or / and paraphenylenediamine is used. One kind of PI may be used alone, or two or more kinds of PI may be used in combination. In the latter case, the total amount thereof may be within the above-mentioned blending amount range.
PI is preferably a reaction product of biphenyltetracarboxylic anhydride and oxydianiline from the viewpoint of more effectively reducing the initial coefficient of friction and further improving the wear resistance.

  A commercially available PI can be used, for example, UIP-R (manufactured by Ube Industries), or UIP-S (manufactured by Ube Industries).

  When other heat-resistant organic polymers such as aromatic polyamide are used instead of PI, the friction coefficient is very large, and the frictional force between the inner peripheral surface of the film tubular body and the surface of the sliding member is increased. Wrinkles are formed in the recording medium between the film tubular body and the fixing roll, or the apparatus is damaged.

Among the inorganic fine particles described above, from the viewpoint of maintaining a small coefficient of friction and improving wear resistance over a long period of time, it is preferable to add molybdate disulfide alone.
The average primary particle size of the inorganic fine particles is not particularly limited, but usually 0.2 to 10 μm, particularly 0.4 to 2.0 μm is used.

  When talc or the like is used instead of the inorganic fine particles described above, the wear resistance deteriorates, the coefficient of friction of the sliding surface of the sliding member increases during long-term use, and the inner peripheral surface of the film tubular body and the sliding member The frictional force with the surface increases, causing problems such as damage to the apparatus and formation of wrinkles on the recording medium as described above.

  The non-porous sheet comprising the above components can be produced, for example, as follows. First, after sufficiently mixing the above components, the mixture is filled in a predetermined mold, compression molded, and then heated and fired at a temperature equal to or higher than the melting point to obtain a molded body. Thereafter, the sheet is skived to a predetermined thickness with a metal blade to obtain a sheet. When a non-porous sheet is filled with a filler to be described later, a similar process is obtained after mixing and dispersing with the above components to obtain a sheet.

  The surface roughness Ra of the surface of the non-porous sheet, that is, the sliding surface of the sheet-like sliding member 33 is 5.0 to 50.0 μm. If Ra is too small, the effect of retaining the lubricant on the sliding surface is weakened and the frictional resistance is increased. If Ra is too large, the unevenness is too intense and image defects occur in the fixed image. From the viewpoint of more effectively holding the lubricant on the sliding surface, it is preferably in the range of 10.0 μm to 50.0 μm, more preferably 20.0 to 35.0 μm.

  Here, the surface roughness Ra (centerline average roughness) is measured based on JIS standard B0601 (1982). Specifically, the sheet surface is a palpated surface roughness measuring instrument ( (Surf test; manufactured by Mitutoyo Corporation). The measurement conditions at that time are a cutoff value of 2.5 mm, a measurement length of 7.5 mm, and 25 ° C./50%.

When the sheet-like sliding member 33 has a single-layer structure of the non-porous sheet, a surface shape such as the surface roughness Ra can be imparted by embossing the sheet. For example, when a non-porous sheet is heated and pressed with a press, an uneven shape can be imparted to the sheet surface by interposing a mesh wire net between one sheet surface and the press plate. At this time, the desired surface roughness Ra may be given to the sliding surface by adjusting the wire mesh size.
The thickness of the sliding member when the sheet-like sliding member 33 has a single layer configuration of a non-porous sheet is not particularly limited as long as the object of the present invention can be achieved, and is usually 50 to 200 μm, particularly 100 to 200 μm. Is preferred.

  The sheet-like sliding member 33 is not limited to the single-layer configuration of the non-porous sheet as described above. For example, the sheet-like sliding member 33 is provided on one surface or both surfaces of a substrate having irregularities on the surface (hereinafter simply referred to as “substrate”), A multilayer structure provided with the non-porous sheet may also be used. By providing a non-porous sheet on this substrate, the surface shape along the unevenness of the substrate surface also appears on the surface of the non-porous sheet (sliding surface), and the surface shape such as the surface roughness Ra described above It becomes possible to grant. By making the sheet-like sliding member 33 have the above laminated structure, the surface shape such as the surface roughness Ra of the non-porous sheet surface (sliding surface) can be maintained over a long period of time. In addition, the magnitude | size of the unevenness | corrugation on the base-material surface is suitably selected by surface shapes, such as said surface roughness Ra of the desired non-porous sheet. The sheet-like sliding member 33 preferably has a multilayer structure as described above from the viewpoint of strength at high temperature use.

  Here, when a non-porous sheet is provided on a base material, the thickness of the non-porous sheet tends to appear on the surface (sliding surface) of the non-porous sheet due to the surface shape along the unevenness of the surface of the base material to be laminated. Thus, it is preferable that it is 20-150 micrometers, More preferably, it is 40-100 micrometers. If this thickness is too thick, the unevenness of the substrate cannot be reproduced sufficiently, and if it is too thin, the substrate may be exposed when wear or the like occurs, leading to an increase in sliding resistance.

  Examples of the substrate having irregularities on the surface include a porous fiber sheet. In addition, the porous fiber sheet may not be formed by making the fiber itself porous, but may be constituted by a resin fiber woven fabric made porous by weaving the fiber. The woven fabric has advantages that the surface irregularities are equally spaced and that the surface irregularities can be easily controlled by arbitrarily setting the thickness of the warp and weft fibers. is there.

  As the material of the base material, for example, glass fiber and aramid fiber are preferable from the viewpoint that strength can be added, and glass fiber is particularly preferable. Other base materials include fluorine resins such as polyethylene resin, PTFE (polytetrafluoroethylene), PFA (tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer), FEP (tetrafluoroethylene-hexafluoropropylene copolymer), etc. It is possible to select more appropriately.

  From these viewpoints, the base material is most preferably composed of a woven fabric of glass fibers.

  As a manufacturing method of the sheet-like sliding member 33 having a multilayer structure in which the nonporous sheet is provided on a substrate having irregularities on the surface, a method of directly thermocompression bonding the nonporous sheet to the surface of the substrate, Examples include a method of adhering a non-porous sheet to the surface of the substrate with an adhesive. In the method in which a non-porous sheet is directly heat-pressed on the surface of a substrate, a part of the non-porous sheet is impregnated into a substrate having irregularities and is usually adhered to the substrate convex portion. There may be a problem that the thickness of the film-like non-porous material cannot be ensured, or that the surface shape along the unevenness of the surface of the substrate hardly appears on the sliding surface of the film-like non-porous material. In addition, there are few methods using reactive adhesives that can ensure sufficient heat resistance against heat applied during fixing, and there are restrictions on handling such as reactive adhesives having poor storage stability. Is the current situation. In addition, in the method using an adhesive of the type that volatilizes the solvent and develops the adhesive, it is necessary to press-bond in order to make the surface shape of the base material appear on the surface (sliding surface) of the non-porous sheet. There may be a problem that the volatilization of the gas is not sufficient or the gas is swollen.

  For this reason, the most preferable method is to infiltrate a thermoplastic resin into a substrate having irregularities on the surface, and use this as an adhesive to heat and press the substrate and the non-porous sheet, thereby laminating them.

  In this method, a thermoplastic resin that can secure sufficient heat resistance against the heat applied during fixing is used as an adhesive, and it is used as a fixing member by heating and pressure bonding at a temperature that exhibits thermoplasticity in the manufacturing process. It is possible to ensure the heat resistance at the time.

  In addition, since a thermoplastic resin is used as an adhesive in this method, it is difficult for a part of the non-porous sheet to impregnate a substrate having irregularities, and the necessary thickness of the non-porous sheet cannot be secured. There is no problem that the surface shape along the surface irregularities hardly appears on the surface (sliding surface) of the non-porous sheet.

  Further, in this method, since the thermoplastic resin is infiltrated into the base material and this is used as an adhesive, there are few problems such as poor storage stability of the reactive adhesive and handling restrictions, and the process of volatilizing the solvent or Problems such as gas bulging due to insufficient volatilization of the solvent do not occur.

  In this method, since the thermoplastic resin is infiltrated into the base material, the strength of the base material can be improved, and the warp and weft of the base material woven fabric can be prevented from being displaced or frayed. It is possible to prevent the penetration of the lubricant from the cross section generated when cutting into a shape necessary for incorporation into the fixing device, and to prevent the loss of the lubricant.

  Here, as a method of infiltrating the thermoplastic resin into the base material, a method of impregnating and drying the base material having unevenness in advance, or sandwiching a film-like thermoplastic resin sheet between the base material and the non-porous sheet, For example, a method of bonding while allowing the thermoplastic resin to permeate when pressure bonding under overheating may be used. Furthermore, if necessary, the bonding surface of the non-porous sheet may be subjected to chemical or physical treatment. For example, in order to increase the bonding area, a fine uneven shape (of course, unevenness much smaller than the unevenness of the substrate having unevenness) can be imparted, or chemical treatment, electron beam treatment, or ultraviolet treatment can be performed.

  Examples of the thermoplastic resin include low molecular weight fluororesins (PFA, PTFE, EFA, MFA, FEP). Needless to say, the melting point of the thermoplastic resin used is equal to or lower than the melting point of the film-like non-porous material.

  When the sheet-like sliding member 33 has a multilayer structure, the thickness of the sliding member is not particularly limited as long as the object of the present invention can be achieved, and is usually 50 to 200 μm, particularly preferably 100 to 200 μm.

  EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated more concretely, this invention is not restrict | limited to a following example and should not be interpreted.

Experimental example A
(Examples 1A-3A and 6A-7A, and Comparative Examples 1A-9A)
A mixture made of the materials shown in Table 1 was filled in a predetermined mold, compression molded at 400 kgf / cm ² , and heated and fired at 370 ° C. for 8 hours to obtain a molded body. Next, the molded body was skived with a metal blade to obtain a thin film sheet (non-porous sheet) having a thickness of 50 μm.

  Subsequently, a glass cloth (trade name: fabric (Honda Sangyo Co., Ltd.)) was impregnated with PTFE dispersion to obtain a glass cloth substrate having irregularities.

The glass cloth substrate having irregularities on the surface was superposed so as to be sandwiched between non-porous sheets, and thermocompression bonding was performed under the conditions of a heating temperature of 300 ° C., a press pressure of 10 kgf / cm ² and a pressurization time of 60 seconds. At this time, a fluoro rubber sheet having a thickness of 2 mm is placed between the press plate and the sheet-like sliding member so that the surface shape along the unevenness of the substrate surface is likely to appear on the surface (sliding surface) of the non-porous sheet. The sheet-like sliding member was obtained by being sandwiched between the two.

(Examples 4A and 5A)
A thin film sheet was obtained in the same manner as in Example 1A, except that a mixture made of the materials shown in Table 1 was used and the thickness was adjusted to 150 μm.

This thin film sheet was heated and pressurized with a press. At that time, a mesh wire net (# 40) was interposed between one sheet surface and the press plate to give the sheet surface an uneven shape, thereby obtaining a sheet-like sliding member. The pressing conditions were a heating temperature of 300 ° C., a pressing pressure of 10 kgf / cm ² and a pressing time of 60 seconds. In addition, an elastic body (felt having a thickness of 2 mm) was sandwiched between the wire mesh and the press plate and between the other sheet surface and the press plate during the heating and pressurization.

Abbreviations in the table are as follows.
PTFE: Product name: Full-on PTFE G190 (Asahi Glass PTFE resin)
Product name: Full-on PFA P-66 (Asahi Glass Co., Ltd.)
Product name: UIP-R (manufactured by Ube Industries)
PI-A; trade name: UIP-S (manufactured by Ube Industries)
Aromatic polyamide; Trade name: Twaron (manufactured by Teijin Limited)
MoS ₂ ; Molybdenum disulfide; Product name: Micro size powder (manufactured by Dow Corning)
BN; Boron nitride; Trade name: Denkaboron nitride GP (manufactured by Denki Kagaku Kogyo Co., Ltd.)
Product name: Artificial graphite fine powder UF-G10 (manufactured by Showa Denko KK)
Product name: Hytron (manufactured by Takehara Chemical Industry Co., Ltd.)

(Evaluation)
The sheet-like sliding member was evaluated for the following items.
-Friction coefficient The static friction coefficient in the uneven | corrugated formation surface of a sheet-like sliding member was measured based on JIS-K7215 (1999) (Plastic film and sheet friction coefficient test method).
The dynamic friction coefficient was obtained by measuring the frictional force with a test load of 15.3 kgf in a method based on JIS-K7218 (1999) A method (plastic sliding wear test method).
The smaller the static friction coefficient and the dynamic friction coefficient, the better.
Specifically, the static friction coefficient may be 0.15 or less, preferably 0.14 or less, and more preferably 0.12 or less.
The dynamic friction coefficient may be 0.22 or less, preferably 0.20 or less, and more preferably 0.18 or less.
When the static friction coefficient exceeds 0.15 or the dynamic friction coefficient exceeds 0.22, recording is performed between the fixing tubular body and the fixing roll because the sliding member inhibits the rotation of the fixing tubular body. A wrinkle is formed in the medium.

-Specific wear amount The specific wear amount on the uneven surface of the sheet-like sliding member was measured in accordance with JIS-K7218 (1999) A method (plastic sliding wear test method). The test load is 15.3 kgf. The unit of specific wear is cm ³ / (kgf · m / s · hr).
The smaller the specific wear amount, the better.
Specifically, the specific wear amount may be 8.5 × 10 ⁻⁴ or less, preferably 7 × 10 ⁻⁵ or less, and more preferably 7 × 10 ⁻⁶ or less.

Experimental example B
(Examples 1B-3B)
A sheet-like sliding member was produced in the same manner as in Example 1A, except that a mixture composed of the materials shown in Table 3 was used, and the mesh wire mesh size at the time of pressing so as to have a predetermined sliding surface roughness. Got.

(Comparative Example 1B)
A sheet-like sliding member was obtained in the same manner as in Example 1A, except that a mixture made of the materials shown in Table 3 was used, and that a skiving sheet was used without pressing.

(Evaluation)
The sheet-like sliding member was evaluated for the following items.
-Friction coefficient The coefficient of dynamic friction on the uneven surface of the sheet-like sliding member is the same as in Experimental Example A except that lubricating oil (silicone oil KF-96-100cs: manufactured by Shin-Etsu Chemical Co., Ltd.) is interposed on the sliding surface. Measured by the method. In this case, if the lubricating oil disappears from the sliding interface during the test, the dynamic friction coefficient increases. In the oil lubrication test, the dynamic friction coefficient may be 0.13 or less, more preferably 0.10 or less.

-Oil retention time During the test, the time until the lubricating oil disappeared from the sliding interface and the dynamic friction coefficient increased was measured. The time for the lubricating oil to be at the sliding interface may be 10 hours or more, more preferably 12 hours or more.

1 is a schematic configuration diagram showing a fixing device in which a sheet-like sliding member of the present invention is preferably used.

Explanation of symbols

  1: fixing roll, 2: resin film tubular body, 4: recording medium, 11: heating source, 31: support, 32: elastic body, 33: sheet-like sliding member, 41: toner image, A: pressing member, n: Nip part.

Claims (6)

At least the sliding surface
60-94% by weight of polytetrafluoroethylene resin;
5 to 30% by weight of polyimide resin; and 1 to 10% by weight of one or more inorganic fine particles selected from the group consisting of molybdenum disulfide, boron nitride and graphite
A sliding member for an electrophotographic image fixing device, comprising a non-porous sheet formed by blending, and having a sliding surface roughness Ra in the range of 5.0 to 50.0 μm.   2. The sliding member for an electrophotographic image fixing device according to claim 1, wherein the polyimide resin is a reaction product of biphenyltetracarboxylic anhydride and oxydianiline.   3. The sliding member for an electrophotographic image fixing apparatus according to claim 1, wherein the sliding member has a thickness of 50 to 200 [mu] m.   The electrophotographic sliding member according to any one of claims 1 to 3, wherein a blending amount of the polytetrafluoroethylene resin in the non-porous sheet is 70 to 90% by weight.   The sliding member for an electrophotographic image fixing apparatus according to any one of claims 1 to 4, wherein the non-porous sheet is provided on one surface or both surfaces of a substrate having irregularities on the surface. 6. The sliding member for an electrophotographic image fixing device according to claim 5, wherein the substrate is made of a woven fabric made of glass fiber.

Images