WO2022163128A1 - 帯電ロール - Google Patents
帯電ロール Download PDFInfo
- Publication number
- WO2022163128A1 WO2022163128A1 PCT/JP2021/044523 JP2021044523W WO2022163128A1 WO 2022163128 A1 WO2022163128 A1 WO 2022163128A1 JP 2021044523 W JP2021044523 W JP 2021044523W WO 2022163128 A1 WO2022163128 A1 WO 2022163128A1
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- WO
- WIPO (PCT)
- Prior art keywords
- particles
- charging roll
- surface roughness
- base material
- surface layer
- Prior art date
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Images
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/02—Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices
- G03G15/0208—Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices by contact, friction or induction, e.g. liquid charging apparatus
- G03G15/0216—Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices by contact, friction or induction, e.g. liquid charging apparatus by bringing a charging member into contact with the member to be charged, e.g. roller, brush chargers
- G03G15/0233—Structure, details of the charging member, e.g. chemical composition, surface properties
Definitions
- the present invention relates to a charging roll of an image forming apparatus.
- Patent Documents 1 to 3 are known as techniques referring to the surface roughness of charging rolls.
- Patent Document 1 discloses a charging member comprising a conductive support, a conductive elastic layer laminated on the conductive support, and a conductive resin layer laminated as the outermost layer on the conductive elastic layer. (charging roll) is described.
- the conductive resin layer contains a matrix material and at least one kind of particles selected from the group consisting of resin particles and inorganic particles.
- Patent Document 2 a positive charging single-layer electrophotographic photosensitive drum, a charging device having a contact charging member for charging the surface of the photosensitive drum, and exposing the surface of the charged image carrier to light, An exposure device for forming an electrostatic latent image on the surface of an image carrier, a developing device for developing the electrostatic latent image into a toner image, and a device for transferring the toner image from the image carrier to a transfer medium. and a transfer device.
- the contact charging member is a charging roller made of a conductive rubber having an Asker -C hardness of 62° to 81°. is 55 ⁇ m to 130 ⁇ m, and the ten-point average roughness RZ is 9 ⁇ m to 19 ⁇ m.
- Patent Document 3 discloses a charging roller comprising a conductive support, a semiconductive elastic layer formed in a roll shape on the conductive support, and a protective layer formed on the surface of the semiconductive elastic layer. technology is described.
- the protective layer is formed by applying a protective layer-forming coating liquid containing fine particles that exhibit the function of preventing adhesion of external substances to the protective layer, and the volume average particle diameter of the fine particles is the surface of the protective layer. It is miniaturized so that the roughness is 1 ⁇ m or less.
- Patent Documents 1 to 3 by adjusting the surface roughness of the outermost surface of the charging roll with fine particles contained in the surface layer, the discharge between the charging roll and the photosensitive drum is made as uniform as possible, thereby improving the image quality. try to improve.
- the surface roughness of the charging roll can be controlled by adjusting the thickness of the binder (matrix) on the surface layer, as well as the diameter and amount of particles added to the binder.
- the charging roll can maintain high image quality over a long period of time.
- the present invention provides a charging roll that can maintain high image quality over a long period of time.
- the charging roll includes a core material, a rubber substrate arranged around the core material, and a surface layer arranged around the rubber substrate.
- the surface layer has a base material made of an insulator, a conductive matrix containing a conductive material dispersed in the base material, and particles of a surface roughness imparting material dispersed in the conductive matrix.
- the particles of the surface roughness imparting material are made of an insulating material, are porous, and have a specific surface area of 8.7 m 2 /g or more and 55 m 2 /g or less.
- the porous particles have a larger surface area than spherical particles, and the conductive matrix enters the micropores, so the particles are firmly fixed to the conductive matrix. Therefore, even when the diameter of the particles of the roughness imparting material is large with respect to the thickness of the conductive matrix, the particles are less likely to come off from the conductive matrix. Further, by increasing the diameter of the particles of the roughness imparting material with respect to the thickness of the conductive matrix, the surface roughness of the surface layer can be appropriately increased. As a result, the contact area of the charging roll with respect to the surface of the photoreceptor drum can be reduced, and discharge inhibition due to adhesion of external additives in the toner particles on the photoreceptor drum can be suppressed. In this way, high image quality can be maintained over a long period of time.
- FIG. 1 is a schematic diagram showing an example of an image forming apparatus using a charging roll according to an embodiment of the invention
- FIG. 1 is a cross-sectional view showing an example of a charging roll according to an embodiment of the invention
- FIG. FIG. 2 is a cross-sectional view of an example of a rubber base material and a surface layer cut along the axial direction of a charging roll
- FIG. 5 is a cross-sectional view of another example of the rubber base material and the surface layer cut along the axial direction of the charging roll.
- 4 is a table showing compositions of coating liquids for forming surface layers of charging rolls. 5 is a table showing details of samples subjected to durability tests of charging rolls and test results.
- FIG. 4 is a schematic diagram showing a method of measuring the real contact area with respect to the flat surface of each sample of the charging roll.
- FIG. 2 is a schematic diagram showing a testing machine used for durability tests of charging roll samples.
- the image forming apparatus includes a photoreceptor drum 1. As shown in FIG. 1, a photoreceptor drum 1. As shown in FIG. Around the photosensitive drum 1, a developing section 2, an exposing section 3, a charging section 4, a transfer section 6 and a cleaning section 5 are arranged.
- the developing section 2 is provided with a developing roll 20 , a regulating blade 21 and a supply roll 22 , and is filled with toner 23 .
- a charging roll 40 is provided in the charging section 4 .
- the transfer unit 6 transfers the toner image onto a paper sheet 60 as a recording medium.
- the toner image transferred by the transfer section 6 is fixed by a fixing section (not shown).
- the cylindrical and rotating photosensitive drum 1 and the cylindrical and rotating charging roll 40 are in contact with each other at the nip 50 .
- a region 51 before the nip 50 in the rotation direction of the photoconductor drum 1 and the charging roll 40 in some cases, a region 52 after the nip 50 in addition to the region 51 before the photoconductor drum 1 and the charging roll 40.
- a discharge occurs between them, and the surface of the photosensitive drum 1 is charged. It is preferable that the charged state of the surface of the photoreceptor drum 1 be uniform over the circumferential direction and the axial direction of the photoreceptor drum 1 .
- FIG. 2 is a cross-sectional view showing an example of a charging roll according to an embodiment of the invention.
- the charging roll 40 has a core material 401, a rubber substrate 402 formed on the outer peripheral surface of the core material 401, and a surface layer 403 coated on the outer peripheral surface of the rubber substrate 402.
- a surface layer 403 is formed on the outer peripheral surface of the rubber base material 402 with a coating component, and the surface roughness of the surface layer 403 is adjusted to eliminate uneven discharge between the photoreceptor drum 1 and the charging roll 40. It is possible to discharge the body drum 1 uniformly, and the developing section 2 can deposit the toner on the surface of the photosensitive drum 1 in an amount exactly corresponding to the latent image formed by the exposure section 3 .
- the core material 401 can be made of a metal or resin material with excellent thermal conductivity and mechanical strength.
- the material of the core material 401 is not limited, but for example, metal materials such as stainless steel, nickel (Ni), nickel alloy, iron (Fe), magnetic stainless steel, cobalt-nickel (Co—Ni) alloy, or PI (polyimide resin).
- the structure of the core material 401 is not particularly limited, and may or may not be hollow.
- the surface of the core material 401 is preferably smooth.
- the rubber base material 402 is made of conductive rubber having electrical conductivity.
- the rubber base material 402 may have one layer, or may have two or more layers. Further, an adhesion layer, an adjustment layer, or the like may be provided between the core material 401 and the rubber base material 402 as necessary.
- the rubber base material 402 can be formed by molding, around the core material 401, a rubber composition obtained by adding a conductivity-imparting agent, a cross-linking agent, and the like to conductive rubber.
- the conductive rubber includes polyurethane rubber (PUR), epichlorohydrin rubber (ECO), nitrile rubber (NBR), styrene rubber (SBR), chloroprene rubber (CR), and the like.
- an electronic conductivity imparting agent such as carbon black or metal powder, an ionic conductivity imparting agent, or a mixture thereof can be used.
- the ionic conductivity imparting material includes organic salts, inorganic salts, metal complexes, ionic liquids, and the like.
- Organic salts include sodium trifluoroacetate and the like.
- Inorganic salts include lithium perchlorate, quaternary ammonium salts and the like.
- the metal complex includes ferric halide-ethylene glycol and the like, and specifically, those described in Japanese Patent No. 3655364 can be used.
- the ionic liquid is a molten salt that is liquid at room temperature, and is also called a room temperature molten salt, and particularly has a melting point of 70° C. or lower, preferably 30° C. or lower. Specifically, those described in JP-A-2003-202722 can be used.
- the cross-linking agent is not particularly limited, and for example, sulfur or peroxide vulcanizing agents can be used.
- cross-linking aids include inorganic zinc oxide and magnesium oxide, and organic stearic acid and amines.
- a thiazole-based or other cross-linking accelerator may be used for the purpose of shortening the cross-linking time, etc.
- Other additives may be added to the rubber composition as needed.
- the surface of the rubber base material 402 formed on the outer peripheral surface of the core material 401 is polished by a polishing machine, and after the rubber base material 402 has a predetermined thickness, dry polishing is performed using a polishing whetstone. After that, a surface layer 403 is formed on the outer peripheral surface of the rubber base material 402 .
- the purpose of polishing in this manner is to appropriately adjust the surface roughness of the rubber base material 402 and adjust the surface roughness of the outer surface layer 403 .
- the ten point height of irregularities ( Rz ) according to the surface roughness of the rubber substrate 402 is 8. 0.5 ⁇ m or less is preferred.
- the surface roughness Rz is a value measured by a contact-type surface roughness meter.
- Dry polishing is performed, for example, by moving the rotary grindstone in the axial direction of the core material 401 while keeping the rubber base material 402 in contact with the rubber base material 402 (traverse polishing).
- the rotation speed of the grinding wheel of the polishing machine may be increased sequentially, for example, to 1000 rpm, 2000 rpm, and 3000 rpm.
- the type of polishing grindstone may be changed, for example, GC (green carborundum) grindstone counts may be increased sequentially to GC60, GC120, and GC220.
- the surface of the rubber base material 402 may be further wet-polished with a wet-polishing machine using water-resistant abrasive paper or the like.
- water-resistant abrasive paper for example, water-resistant sandpaper is used, and the rubber substrate 402 is brought into contact with the rubber substrate 402 while being rotated while being supplied with a polishing liquid.
- the hardness of the rubber substrate 402 measured using a durometer (“Type A” conforming to "JIS K 6253” and “ISO 7619”) is preferably in the range of 50° to 64°.
- the surface hardness of the charging roll 400 is affected by the rubber base material 402 . If the hardness of the rubber base material 402 is less than 50°, the convex portions on the surface of the charging roll 400 are crushed, the photosensitive drum 1 is easily soiled, and image defects occur. On the other hand, if the hardness of the rubber base material 402 is greater than 64°, the projections on the surface of the charging roll 400 may be reflected in the image.
- the surface layer 403 can be formed by applying a coating liquid to the outer peripheral surface of the rubber base material 402 and drying and curing it.
- a method for applying the coating liquid a dip coating method, a roll coating method, a spray coating method, or the like can be used.
- the cured surface layer 403 comprises a conductive matrix 404 and particles of, for example, an insulating surface roughness imparting agent (also called roughness imparting agent) dispersed in the conductive matrix 404. 405.
- an insulating surface roughness imparting agent also called roughness imparting agent
- the particles 405 of the roughness imparting material give the surface layer 403 an appropriate surface roughness. If the surface of the surface layer 403 is too smooth, the contact area between the surface layer 403 and the photosensitive drum 1 increases. As a result, it is considered that the external additive in the toner particles on the photosensitive drum 1 adheres to the surface of the surface layer 403 after long-term use, which causes discharge inhibition and image unevenness.
- the surface roughness of the surface layer 403 is adjusted by dispersing the particles 405 of the roughness imparting material in the surface layer 403 formed on the rubber base material 402 whose surface roughness has been adjusted. ing.
- the conductive matrix 404 has a role of holding the particles 405 of the roughness imparting material at a fixed position and a role of discharging the photosensitive drum 1 .
- Conductive matrix 404 has a base material and a conductive agent dispersed in the base material. As noted above, discharge occurs between charge roll 400 and photoreceptor drum 1 in region 51 (and possibly region 52).
- the particles 405 of the roughness imparting material are not completely embedded in the conductive matrix 404 in the examples shown in FIGS. 3 and 4, they may be completely embedded. If the thickness of the conductive matrix 404 is small, the ability to hold the particles 405 of the roughness imparting material is low. It is preferred to have On the other hand, when the thickness of the conductive matrix 404 is too large, the surface roughness of the surface layer 403 becomes too small, and the coefficient of friction between the surface layer 403 and the photosensitive drum 1 increases. Therefore, the thickness of conductive matrix 404 is preferably within a suitable range.
- the thickness of the conductive matrix 404 is large, and the electrical resistance of the conductive matrix 404 is large, discharge tends to occur with difficulty.
- the electrical resistance of the conductive matrix 404 can be reduced, making it easier to generate discharge.
- the content of the particles 405 of the roughness imparting material in the surface layer 403 is within an appropriate numerical range. If the content of particles is large, the particles overlap each other, so the surface of the surface layer 403 becomes rough, which is considered to cause image unevenness.
- the component of the coating liquid which is the material of the surface layer 403, contains at least particles 405 of the base material, the conductive agent, and the surface roughness imparting material. After curing the coating liquid, the base material and the conductive agent become components of the conductive matrix 404 .
- the coating liquid is obtained, for example, by dissolving the components having the following composition in a diluent solvent.
- Base material 10 to 80 parts by weight.
- Conductive agent 1 to 50 parts by weight.
- ⁇ Surface roughness imparting material 20% by weight or less of the total amount of the coating liquid.
- the discharge between the charging roll 400 and the photosensitive drum 1 is substantially uniform in the region 51 before the nip 3 where the charging roll 400 and the photosensitive drum 1 contact each other, and the image is formed. It is believed that an image having a desired density is formed without uneven discharge during formation, and the image quality is improved.
- the surface condition of the surface layer 403 can be appropriately adjusted by appropriately adjusting the diameter and addition amount of the particles 405 of the surface roughness imparting material.
- the base material contained in the coating liquid is an insulator.
- Insulators suitable as base materials include urethane resin, acrylic resin, acrylic urethane resin, amino resin, silicone resin, fluorine resin, polyamide resin, epoxy resin, polyester resin, polyether resin, phenol resin, urea resin, polyvinyl butyral. Resins, melamine resins, nylon resins and the like are included. These insulating materials can be used alone or in any combination as the base material.
- Conductive agents suitable for inclusion in the coating solution include carbon blacks such as acetylene black, ketjen black, and toka black, carbon nanotubes, ions such as lithium perchlorate, 1-butyl-3-methylimidazo hexafluorophosphate. It includes ionic liquids such as lithium, metal oxides such as tin oxide, and conductive polymers. These conductive agents can be used in the coating liquid either singly or in any combination.
- Particles 405 of the surface roughness imparting material suitable for inclusion in the coating liquid include acrylic particles, urethane particles, polyamide resin particles, silicone resin particles, fluororesin particles, styrene resin particles, phenol resin particles, polyester resin particles, Olefin resin particles, epoxy resin particles, nylon resin particles, carbon, graphite, balloon carbide, silica, alumina, titanium oxide, zinc oxide, magnesium oxide, zirconium oxide, calcium sulfate, calcium carbonate, magnesium carbonate, calcium silicate, aluminum nitride , boron nitride, talc, kaolin clay, diatomaceous earth, glass beads, hollow glass spheres, and the like. These particles can be used singly or in any combination in the coating liquid.
- the diluent solvent contained in the coating liquid is not particularly limited, but water-based solvents, or methyl acetate, ethyl acetate, butyl acetate, methyl ethyl ketone (MEK), methyl isobutyl ketone (MIBK), methanol, ethanol, butanol, 2- Solvents such as propanol (IPA), acetone, toluene, xylene, hexane, heptane, chloroform and the like are included.
- MEK methyl ethyl ketone
- MIBK methyl isobutyl ketone
- 2- Solvents such as propanol (IPA), acetone, toluene, xylene, hexane, heptane, chloroform and the like are included.
- the particles 405 of the roughness imparting material dispersed in the conductive matrix 404 give the surface layer 403 an appropriate surface roughness.
- Applicants have the following knowledge about the relationship between the conductive matrix 404 and the particles 405 .
- the embedding depth of the particles 405 in the conductive matrix 404 is small, and the adhesion between the conductive matrix 404 and the particles 405 is small. small in nature. Therefore, particles 405 are likely to fall off from conductive matrix 404 . When many particles 405 are lost, the distance between the charging roll 40 and the photoreceptor drum 1 in the area 51 is narrowed and the charging performance is changed.
- the surface roughness of the surface layer 403 becomes too small, resulting in a photoreceptor.
- the contact area of the charging roll 40 with respect to the surface of the drum 1 increases, and there is a concern that the adhesion of an external additive or the like in the toner particles on the photoreceptor drum 1 may accelerate discharge inhibition.
- porous particle is a particle having at least a large number of recesses or micropores on its surface.
- porous particles 405 particles having recesses formed only on the surface may be used.
- porous particles 405 may be particles having, for example, a sponge- or foam-like structure in which micropores intersect to the inside.
- a spherical shape without micropores on the surface is hereinafter referred to as a "true sphere".
- porous particles have a larger surface area and the conductive matrix 404 enters the micropores, so the particles are firmly fixed (anchored) to the conductive matrix 404 . Therefore, even when the diameter of the particles 405 of the roughness imparting material is large with respect to the thickness of the conductive matrix 404, the particles 405 are less likely to fall off from the conductive matrix 404.
- FIG. In this regard, the particles 405 of FIG. 4 are believed to be preferable to the particles 405 of FIG.
- the diameter of the particles 405 of the roughness imparting material can be increased with respect to the thickness of the conductive matrix 404, the surface roughness of the surface layer 403 can be appropriately increased.
- the contact area of the charging roll 40 with respect to the surface of the photoreceptor drum 1 can be reduced, and discharge inhibition due to adhesion of external additives in the toner particles on the photoreceptor drum 1 can be suppressed. In this way, high image quality can be maintained over a long period of time.
- the applicant produced a plurality of samples of the charging roll 40 and conducted an endurance test to examine whether or not each sample could reduce the shedding of the particles 405 .
- the samples prepared in the test are as follows.
- the rubber base material 402 of each sample was formed as follows.
- the kneaded rubber composition was made into a sheet-like material, wound around the surface of the core material 401, and press-molded to obtain a rubber base material 402 made of crosslinked epichlorohydrin rubber.
- the surface of the rubber base material 402 was polished with a polishing machine. Specifically, the surface of the rubber base material 402 was polished with a grinder to form the rubber base material 402 with a predetermined thickness (2 mm), and then dry-polished with a whetstone-type grinder. Further, wet polishing was performed with a wet polishing machine using water-resistant polishing paper.
- Cutoff: ⁇ c 0.8mm Measurement length: 4mm Measurement speed: 0.5mm/sec Measurement position: Surface roughness RZ was measured at three positions in one charging roll 40 . Then, the average value of these values was calculated.
- the ten-point average roughness RZ of the rubber substrate 402 was 3 ⁇ m.
- a coating liquid was prepared for forming the surface layer 403 on the outer peripheral surface of the rubber base material 402 described above.
- the composition of the coating liquid is as shown in FIG.
- porous urethane particles As the porous urethane particles, "ART PEARL TE-812T” manufactured by Neagari Kogyo Co., Ltd. (Ishikawa Prefecture, Japan) was used. Its average diameter was 6 ⁇ m. Its particle specific surface area was 55 m 2 /g. The particles were of the type shown in FIG. 4, in which a plurality of micropores intersect to the inside.
- porous polyamide particles "Orgasol 2001 UD Nat1" manufactured by Arkema SA (Colombes, France) was used. Its average diameter was 5 ⁇ m. Its particle specific surface area was 8.7 m 2 /g. The particles were of the type shown in FIG. 3 with a plurality of recesses formed only on the surface. Although not used in the test, the particle specific surface area of true spherical polyamide particles having the same diameter is 1.2 m 2 /g.
- the particles 405 of the surface roughness imparting material are contained at a rate of 2% or more and 4% or less with respect to the weight of the surface layer 403 (see FIG. 6).
- the coating liquid with the above composition was dispersed and mixed using ultrasonic waves.
- the surface layer 403 was formed by applying the above coating liquid to the outer peripheral surface of the rubber substrate 402 that had been polished, and the charging roll 40 was produced. Specifically, the coating liquid is spray-coated on the surface of the rubber substrate 402 and dried in an electric furnace at 80 to 160° C. for 20 to 60 minutes to form the surface layer 403 on the outer peripheral surface of the rubber substrate 402, Charge roll samples 1 to 7 were prepared.
- the ten-point average roughness RZ was also measured for the surface layer 403 of each sample.
- the measurement machine and measurement conditions were the same as the rubber substrate 402 measurement machine and measurement conditions.
- FIG. 6 shows the average surface roughness RZ at three locations on each sample.
- the film thickness of the surface layer 403 (conductive matrix 404) of each sample was measured.
- a sample was cut along a cross section perpendicular to the axial direction of the charging roll 40, and the distance from the outer peripheral surface of the surface layer 403 (conductive matrix 404) to the outer peripheral surface of the rubber substrate 402 was measured.
- the distance was measured using a non-contact laser microscope.
- the laser microscope used was "VK-X200" manufactured by Keyence Corporation (Osaka, Japan).
- the magnification was 1000 times and the area of the captured image was 200.0 ⁇ m ⁇ 285.1 ⁇ m.
- the film thickness was measured at 20 locations in the photographed image, and the average value was calculated.
- FIG. 6 shows the average film thickness of the surface layer 403 of each sample.
- the applicant measured the true contact area with respect to the flat surface of each sample of the charging roll 40 by the method shown in FIG. As shown in FIG. 7, a load F1 of 0.6 N was applied to bring the charging roll 40 sample into contact with a transparent glass plate 70, and a transparent triangular prism 71 was placed on the opposite side of the charging roll 40. , one surface of the prism 71 is brought into surface contact with the glass flat plate 70 . Then, the charging roll 40 is irradiated with light from the light source 72 through the prism 71 and the flat glass plate 70 , and the charging roll 40 compressed by the flat glass plate 70 is magnified using the microscope 73 through the prism 71 and the flat glass plate 70 . I took a picture.
- the microscope 73 used was "VHX-5000" manufactured by Keyence Corporation (Osaka, Japan). The magnification was 100 ⁇ and the area of the captured image was 3.05 ⁇ 2.28 mm. For each sample, an analysis area of 0.6 ⁇ 2.0 mm is selected from the photographed image, the image of the selected area is binarized, and the charging roll 40 actually in contact with the glass flat plate 70 is obtained. , the local area (true contact area) was calculated.
- FIG. 6 shows the true contact area ratio (ie, the true contact area divided by the area of the analyzed area) for each sample.
- FIG. 8 shows the testing machine used for the durability test.
- the durability tester has a photoreceptor drum 1 and an LED (light emitting diode) 80.
- the photoreceptor drum 1 of the durability tester was the same as that mounted on a color multifunction machine "TASKalfa 5550ci" manufactured by Kyocera Document Solutions Co., Ltd. (Osaka, Japan).
- the diameter of the photosensitive drum 1 was 30 mm. Each sample had a diameter of approximately 12 mm.
- a load F2 of 4.9 N was applied in the same manner as in normal use, a sample of the charging roll 40 was brought into contact with the photosensitive drum 1, the photosensitive drum 1 was driven to rotate, and a sample of the charging roll 40 was tested. was driven to rotate.
- the peripheral speed of the photosensitive drum 1 was 390 mm/sec.
- the LED 80 continued to irradiate the photoreceptor drum 1 with light while the photoreceptor drum 1 was rotating in order to remove the potential on the surface of the photoreceptor drum 1 .
- the power supply 81 for supplying current to the samples of the photosensitive drum 1 and charging roll 40 was of the AC/DC voltage superimposition type.
- the alternating current was 3.4 mA and the alternating frequency was 3 kHz.
- DC current was 0.3 mA.
- the test time for the endurance test is 30 hours, which corresponds to the printing time of 200,000 sheets when the short side direction of A4 paper is the passing direction of the sheet 60 .
- the porous particles were firmly fixed to the conductive matrix 404 .
- the particles 405 of the surface roughness imparting material are preferably porous and have a specific surface area of 8.7 m 2 /g or more and 55 m 2 /g or less.
- the average diameter of the particles 405 is preferably 5 ⁇ m or more and 6 ⁇ m or less.
- the larger the diameter of the porous particles 405, the higher the adherence to the conductive matrix 404, and spherical particles 405 with a diameter of 5 ⁇ m or more and 60 ⁇ m or less exhibit good performance in printing. Applicant knows that Therefore, the average diameter of particles 405 is preferably 5 ⁇ m or more and 60 ⁇ m or less.
- the particles 405 are contained at a rate of 2% or more and 4% or less with respect to the weight of the surface layer 403.
- the average value of the thickness of the conductive matrix 404 is preferably 0.5 or more and 3.4 or less of the average diameter of the particles 405 of the surface roughness imparting material.
Abstract
Description
・ベース材:10重量部~80重量部。
・導電剤:1重量部~50重量部。
・表面粗さ付与材:コーティング液全量の20重量%以下。
測定長:4mm
測定速度:0.5mm/sec
測定位置:1本の帯電ロール40の内、3か所で表面粗さRZを測定した。そして、これらの値の平均値を計算した。
401 芯材
402 ゴム基材
403 表層
404 導電性マトリックス
405 粗さ付与材の粒子
Claims (8)
- 芯材と、
前記芯材の周囲に配置されたゴム基材と、
前記ゴム基材の周囲に配置された表層とを備え、
前記表層は、
絶縁体から形成されたベース材と前記ベース材に分散された導電材を含む導電性マトリックスと、
前記導電性マトリックスに分散された表面粗さ付与材の粒子を有し、
前記表面粗さ付与材の粒子は、絶縁体から形成され、多孔質であり、8.7m2/g以上、55m2/g以下である比表面積を有する
ことを特徴とする帯電ロール。 - 前記表面粗さ付与材の粒子は、ウレタンから形成されている
ことを特徴とする請求項1に記載の帯電ロール。 - 前記表面粗さ付与材の粒子の内部では複数の微細孔が交錯する
ことを特徴とする請求項2に記載の帯電ロール。 - 前記表面粗さ付与材の粒子は、ポリアミドから形成されている
ことを特徴とする請求項1に記載の帯電ロール。 - 前記表面粗さ付与材の粒子の表面のみに複数の凹部が形成されている
ことを特徴とする請求項4に記載の帯電ロール。 - 前記表面粗さ付与材の粒子は、5μm以上、60μm以下である平均直径を有する
ことを特徴とする請求項1から5のいずれか1項に記載の帯電ロール。 - 前記表面粗さ付与材の粒子は、前記表層の重量に対して、2%以上、4%以下の割合で含まれている
ことを特徴とする請求項1から6のいずれか1項に記載の帯電ロール。 - 前記表層の前記導電性マトリックスは、前記表面粗さ付与材の粒子の平均直径の0.5以上、3.4以下である平均厚さを有する
ことを特徴とする請求項1から7のいずれか1項に記載の帯電ロール。
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EP21923133.9A EP4286951A1 (en) | 2021-02-01 | 2021-12-03 | Charge roller |
JP2022578093A JPWO2022163128A1 (ja) | 2021-02-01 | 2021-12-03 | |
US18/274,901 US20240094656A1 (en) | 2021-02-01 | 2021-12-03 | Charging roll |
CN202180091868.5A CN116868131A (zh) | 2021-02-01 | 2021-12-03 | 带电辊 |
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EP (1) | EP4286951A1 (ja) |
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US10353317B1 (en) * | 2018-07-24 | 2019-07-16 | Xerox Corporation | Electrostatic charging member |
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2021
- 2021-12-03 EP EP21923133.9A patent/EP4286951A1/en active Pending
- 2021-12-03 WO PCT/JP2021/044523 patent/WO2022163128A1/ja active Application Filing
- 2021-12-03 CN CN202180091868.5A patent/CN116868131A/zh active Pending
- 2021-12-03 JP JP2022578093A patent/JPWO2022163128A1/ja active Pending
- 2021-12-03 US US18/274,901 patent/US20240094656A1/en active Pending
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US20240094656A1 (en) | 2024-03-21 |
EP4286951A1 (en) | 2023-12-06 |
CN116868131A (zh) | 2023-10-10 |
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