WO2020175435A1 - Rouleau de charge - Google Patents

Rouleau de charge Download PDF

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Publication number
WO2020175435A1
WO2020175435A1 PCT/JP2020/007354 JP2020007354W WO2020175435A1 WO 2020175435 A1 WO2020175435 A1 WO 2020175435A1 JP 2020007354 W JP2020007354 W JP 2020007354W WO 2020175435 A1 WO2020175435 A1 WO 2020175435A1
Authority
WO
WIPO (PCT)
Prior art keywords
charging port
particles
base material
rubber
surface layer
Prior art date
Application number
PCT/JP2020/007354
Other languages
English (en)
Japanese (ja)
Inventor
章吾 鈴木
池田　篤
麻実 植松
孝祐 大浦
智 福岡
佐々木　憲司
Original Assignee
Nok株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nok株式会社 filed Critical Nok株式会社
Publication of WO2020175435A1 publication Critical patent/WO2020175435A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C13/00—Rolls, drums, discs, or the like; Bearings or mountings therefor
    • 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
    • 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
    • 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
    • G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
    • G03G21/06—Eliminating residual charges from a reusable imaging member

Definitions

  • the present invention relates to a charging port of an image forming apparatus.
  • Patent Documents 1 to 3 are known as techniques that mention the surface roughness of the charging port.
  • Patent Document 1 discloses a conductive support, a conductive elastic layer laminated on the conductive support, and a conductive resin layer laminated on the conductive elastic layer as an outermost layer.
  • the technology concerning a charging member (charging port) consisting of 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.
  • the particles contain the first particles and the matrix material alone in the conductive resin layer is contained.
  • the layer thickness of the portion formed by [] is []
  • the average particle diameter of the particles is [1]
  • the interparticle distance of the particles is []
  • eight is 1 0 0 1 to 7 0, and 1/8 is from 5.0 to 30.0, Is.
  • Patent Document 2 discloses a positively charged single-layer type electrophotographic photosensitive member, a charging device having a contact charging member for charging the surface of the photosensitive member, and an exposed surface of a charged image carrier. Then, an exposure device for forming an electrostatic latent image on the surface of the image carrier, a developing device for developing the electrostatic latent image as a toner image, and a toner image from the image carrier to the transfer target.
  • a technique relating to an image forming apparatus including a transfer device for transferring is described.
  • the contact charging member is a charging port made of a conductive rubber having a rubber hardness of 8 3 1 ⁇ 6 ”_ ⁇ with a hardness of 62 ° to 81 °.
  • the surface roughness is the average interval of irregularities. And, and ten-point average roughness Is. ⁇ 02020/175435 2 (:170? 2020/007354
  • Patent Document 3 discloses a conductive support, a semiconductive elastic layer formed in a mouth shape on the conductive support, and a protective layer formed on the surface of the semiconductive elastic layer.
  • the technology related to the charging port roller having the above is described.
  • the protective layer is formed by applying a protective layer-forming coating solution containing fine particles that have a function of preventing external substances from adhering to the protective layer. It is made fine so that the surface roughness is 1 Mm or less.
  • Patent Documents 1 to 3 by adjusting the surface roughness of the outermost surface of the charging roll by the fine particles contained in the surface layer, the discharge between the charging port and the photoconductor is made as uniform as possible. To improve the image quality.
  • Patent Document 1 Japanese Patent Laid-Open No. 2015 _ 1 2 1 769
  • Patent Document 2 JP 201 2 _ 1 4 1 4 1 Publication
  • Patent Document 3 JP 2005 _ 9 1 4 1 4 Publication
  • An object of the present invention is to provide a charging port capable of reducing image unevenness.
  • a charging port according to the present invention includes a core material, and a rubber base material arranged around the core material.
  • + point average roughness (ten point height of irregularities) R z of the surface layer is 12.9 Mm or more and 16.2 Mm, and the surface roughness of the surface layer is The mean length of a roughness curve element RSm is 75.
  • FIG. 1 is a schematic view showing an example of an image forming apparatus using a charging port according to an embodiment of the present invention.
  • FIG. 2 is a cross-sectional view showing an example of the charging port according to the embodiment of the present invention.
  • FIG. 3 is a cross-sectional view of the rubber base material and the surface layer cut along the axial direction of the charging port. MODE FOR CARRYING OUT THE INVENTION
  • the image forming apparatus includes a photoconductor 1.
  • a developing section 2 Around the photoreceptor 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 port 20, a control blade 21 and a supply port 22 and is filled with toner _ 2 3.
  • the charging section 4 is provided with a charging port 40.
  • the transfer unit 6 transfers the toner image onto a paper sheet 60 which is a recording medium.
  • the toner image transferred by the transfer unit 6 is fixed by a fixing unit (not shown).
  • the cylindrical and rotating photoconductor 1 and the cylindrical and rotating charging port 40 contact at a nip 50.
  • Discharge occurs between the photoconductor 1 and the charging port 40, and the surface of the photoconductor 1 is charged.
  • the charged state of the surface of the photoconductor 1 is preferably uniform in the circumferential direction and the axial direction of the photoconductor 1.
  • FIG. 2 is a cross-sectional view showing an example of the charging port according to the embodiment of the present invention.
  • the charging port 40 is composed of a core member 401, a rubber base member 402 formed on the outer peripheral surface of the core member 401, and an outer periphery of the rubber base member 40. And a surface layer 40 3 coated on the surface.
  • a surface layer 40 3 coated on the surface.
  • the developing section 2 can attach the toner in an amount corresponding to the latent image formed in the exposing section 3 to the surface of the photoconductor 1 accurately.
  • the core material 401 can be formed of, but is not limited to, a metal or resin material having excellent thermal conductivity and mechanical strength.
  • a metal or resin material having excellent thermal conductivity and mechanical strength.
  • the structure of the core material 401 is not particularly limited, and may be hollow or not hollow.
  • the rubber base material 402 is arranged on the outer peripheral surface of the core material 401, and is made of conductive rubber having conductivity.
  • the rubber substrate 402 may have one layer or 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, if necessary.
  • the rubber base material 402 is formed by molding a rubber composition obtained by adding a conductivity-imparting material, a cross-linking agent, or the like to conductive rubber, around the core material 401. it can .
  • a conductivity-imparting material e.g., polyurethane rubber , Epichlorohydrin rubber (Min ⁇ ), Nitrile rubber Examples thereof include styrene rubber (3) and chloroprene rubber ( ⁇ ).
  • an electron conductivity-imparting material such as carbon black or metal powder, an ionic conductivity-imparting material, or a mixture thereof can be used.
  • Examples of the ionic conductivity imparting agent include organic salts, inorganic salts, metal complexes, ionic liquids and the like.
  • organic salts include sodium trifluoride acetate
  • examples of inorganic salts include lithium perchlorate and quaternary ammonium salts.
  • examples of the metal complex include ferric halide-ethylene glycol and the like, and specific examples thereof include those described in Japanese Patent No. 36565356.
  • the ionic liquid is a molten salt that is a liquid at room temperature, and is also called an ordinary temperature molten salt. In particular, the melting point is 70 ° C or less, preferably 3 ° C or less. ⁇ 02020/175435 5 ⁇ (: 170? 2020 /007354
  • crosslinking agent is not particularly limited, and examples thereof include sulfur and peroxide vulcanizing agents.
  • the rubber composition may be added with a crosslinking aid or the like which accelerates the action of the crosslinking agent, if necessary.
  • a crosslinking aid include inorganic zinc oxide and magnesium oxide, and organic stearic acid and amines.
  • a thiazole type or other crosslinking accelerator may be used for the purpose of shortening the crosslinking time.
  • Other additives may be added to the rubber composition if necessary.
  • 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, adjusted to a predetermined thickness, and then subjected to dry polishing with a polishing whetstone.
  • a surface layer 403 is formed on the outer peripheral surface of the rubber substrate 402. The polishing is performed in this manner in order to properly adjust the surface roughness of the rubber base material 402 and to adjust the surface roughness of the outer surface layer 403 outside thereof.
  • the surface roughness R z is a value measured by a contact type surface roughness meter.
  • the dry polishing is performed, for example, by rotating the rubber substrate 402 and moving the rotating grindstone in the axial direction while contacting the rubber substrate 402 (traverse polishing).
  • the number of rotations of the grindstone of the polishing machine may be increased successively, for example, 1 000 r pm, 2000 r pm and 3 000 rpm during rotation. ..
  • the type of the grindstone may be changed, and for example, the G C (green carborundum) grindstone count may be sequentially raised to grind such as GC 60, GC 120 and GC 220.
  • the surface of the rubber substrate 402 may be further wet-polished with a wet-polishing machine using a water-resistant polishing vapor or the like.
  • a water-resistant polishing vapor for example, a water-resistant sand vapor is used.
  • Polishing is performed by bringing the rubber base material 402 into contact while rotating while supplying the polishing liquid.
  • the hardness of the surface of the charging port 40 is influenced by the rubber base 40 2. If the hardness of the rubber base material 40 2 is less than 50°, the protrusions on the surface of the charging port 40 will be crushed, and the photoreceptor 1 will be easily soiled, resulting in image defects. On the other hand, if the hardness of the rubber base material 40 2 is larger than 64 ° , the convex portion on the surface of the charging port 40 may be reflected in the image.
  • the surface layer 40 3 can be formed by applying the coating liquid to the outer peripheral surface of the rubber base material 40 2 and drying and curing the coating liquid.
  • a method of applying the coating liquid a dip coating method, a mouth coating method, a spray coating method or the like can be used.
  • the cured surface layer 403 is composed of a conductive matrix 404 and, for example, an insulating surface roughness imparting material (roughness imparting material) dispersed in the conductive matrix 404. Also referred to as ).
  • the particles 405 of the roughness imparting material give the surface layer 403 an appropriate surface roughness.
  • 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 photoconductor 1.
  • the conductive matrix 404 has a conductive material dispersed in a base material and a base material. As described above, in the area 5 1 (and the area 52 in some cases), discharge occurs between the charging port 40 and the photoreceptor 1.
  • the particles of roughness imparting material 450 are not completely embedded in the conductive matrix 40 4, but may be completely embedded.
  • the ability to retain the particles of roughness imparting material 450 is low, so that the diameter of the particles of roughness imparting material 40 Sex matric ⁇ 0 2020/175 435 7 ⁇ (: 170? 2020 /007354
  • the strips 404 preferably have a suitable thickness.
  • the particles 400 of the roughness imparting material are insulators, the thickness of the conductive matrix 404 is large, and the electrical resistance of the conductive matrix 404 is large, discharge is unlikely to occur.
  • the electrical resistance of the conductive matrix 404 can be reduced and discharge can be easily generated.
  • the particles 4 05 of the roughness imparting material are dispersed in the surface layer 4 03 formed on the rubber base material 40 2 whose surface roughness is adjusted.
  • the surface roughness of the surface layer 43 is adjusted.
  • the film thickness of the conductive matrix 404 of the surface layer 403 is within an appropriate numerical range. If this thickness is too large, it is considered that the surface roughness of the surface layer 403 becomes too small, which causes image unevenness.
  • the content ratio of the particles 45 of the roughness imparting material of the surface layer 43 is within an appropriate numerical range.
  • the particles overlap each other, so that the surface of the surface layer 403 becomes rough, which is considered to cause image unevenness.
  • the components of the coating liquid which is the material of the surface layer 43, contain at least particles 40 of a base material, a conductive agent, and a surface roughness imparting material. After the coating liquid is cured, the base material and the conductive agent become the components of the conductive matrix 404.
  • the coating liquid is obtained, for example, by dissolving the components having the following composition in a diluting solvent (coating liquid composition).
  • Base material 10 to 80 parts by weight.
  • -Surface roughness imparting material 70% by weight or less of the total amount of coating liquid.
  • the charging port is not provided in the gap before the nip where the charging port 40 and the photoconductor 1 contact each other. ⁇ 0 2020/175 435 8 (: 17 2020/007354
  • the discharge between the toner 40 and the photoconductor 1 is almost uniformized, an image of desired density is formed without uneven discharge during image formation, and the image quality is improved. It is considered that the surface roughness and the pitch of the irregularities of the surface layer 403 can be appropriately adjusted by appropriately adjusting the particle size and the addition amount of No. 5.
  • the base material contained in the coating liquid is an insulator.
  • Base materials include urethane resin, acrylic resin, acrylic urethane resin, amino resin, silicone resin, fluororesin, polyamide resin, epoxy resin, polyester resin, polyether resin, phenol resin, urea resin, polyvinyl butyral resin Moonlight, melamine resin, nylon resin and the like. These base materials can be used alone or in any combination.
  • Conductive agents contained in the coating liquid include acetylene black, ketchen black, black carbon, etc., carbon black, carbon nanotube, lithium perchlorate ion, etc., hexafluorophosphate 1-butyl-3-methylethylimidazole, etc.
  • Examples include ionic liquids, metal oxides such as tin oxide, and conductive polymers. These conductive agents can be used alone or in any combination.
  • Particles of the surface roughness imparting agent contained in the coating liquid 450 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, Balun carbide, Silica, Alumina, Titanium oxide, Zinc oxide, Magnesium oxide, Zirconium oxide, Calcium sulfate, Calcium carbonate, Magnesium carbonate, Silicate Calcium, aluminum nitride, boron nitride, tar ⁇ 0 2020/175 435 9 ⁇ (: 170? 2020 /007354
  • the diluting solvent contained in the coating liquid is not particularly limited, but is water-based, or methyl acetate, ethyl acetate, butyl acetate, methyl ethyl ketone (IV!Mi ⁇ ), methyl isoptyl ketone (1 ⁇ /1 Tomi), methanol Solvent systems such as ethanol, butanol, 2-propanol (0.8), acetone, toluene, xylene, hexane, heptane, chloroform and the like.
  • samples 1 to 6 were manufactured as the charging port 40 according to the embodiment.
  • Epichlorohydrin rubber (Epichromer 10 2 ;Osaka Soda Co., Ltd. (Osaka, Japan) 100 parts by weight, sodium trifluoroacetate as a conductivity-imparting material 0.5 parts by weight, zinc white 3 parts by weight, stearic acid 2 parts by weight
  • the rubber composition to which 1.5 parts by weight of the cross-linking agent was added was kneaded with a mouth mixer.
  • the core material 4 01 core metal
  • the surface of the rubber base material 402 was polished by a polishing machine. Specifically, the surface of the obtained rubber base material 402 was polished by a polishing machine, adjusted to a predetermined thickness (2), and further polished by dry polishing. In the experiment, the wheel speed was not changed
  • a coating liquid for forming the surface layer 40 3 on the outer peripheral surface of the rubber base material 402 was prepared.
  • composition of the coating solution is shown in Table 1.
  • urethane particles As the urethane particles, urethane beads manufactured by Negami Kogyo Co., Ltd. (Tokyo, Japan) were used.
  • one product contains particles with a size different from the average size.
  • Samples 1 to 6 having different surface states of the surface layer 40 3 were produced by applying a coating liquid containing particles 45 of the surface roughness imparting material with different particle diameters.
  • Table 2 shows the surface roughness and the pitch of the unevenness of the surface layers 403 of these samples 1 to 6.
  • the coating liquid having the above composition was dispersed and mixed in a ball mill for 3 hours.
  • the above coating liquid was applied to the outer peripheral surface of the polished rubber substrate 40 2 to form a surface layer 40 3, and a charging port 40 was prepared. Specifically, the coating liquid is agitated, the liquid is spray-coated on the surface of the rubber base material 402, and dried in an electric furnace at 120° for 60 minutes. A surface layer 40 3 was formed on the outer peripheral surface of, and a charging port was prepared.
  • Measurement position The surface roughness R z was measured at three locations on one charging port 40. Then, the average value of these values was calculated, and the average value is shown in Table 2.
  • the laser microscope used was “VK-X 200” manufactured by Keyence Corporation (Osaka Prefecture, Japan).
  • the magnification is 400 times, and the respective visual fields of the two power stations are 528.7 gm in the circumferential direction of the charging port 40 and 705.1 in the axial direction of the charging port 40. Met.
  • An image evaluation test of the charging port was performed using a copying machine.
  • the copier was a color multifunction machine (1 ⁇ /1) "1 ⁇ 05503" (AC/DC voltage superimposed application type) manufactured by Ricoh Co., Ltd. (Tokyo, Japan).
  • the DC voltage is the normal voltage (?3 ⁇ 4mi), and the AC voltage depends on the control of the copying machine.
  • the alternating current is lower than the normal alternating current ([3 ⁇ 4]) of the copying machine (1.
  • the charging port was applied to a copying machine, and image unevenness was evaluated for images printed under the following printing conditions (halftone images and white solid images). The results are shown in Table 2.
  • the image unevenness was evaluated by determining local discharge in the halftone image.
  • the occurrence of local discharge can be confirmed by visually observing the occurrence of white spots, black spots, white streaks, and black streaks in the halftone image.
  • the white solid image was visually evaluated for background stain, that is, capry.
  • the white solid image was visually inspected for the presence or absence of background stains, that is, capri (printing on a place where it should not be printed).
  • the ten-point average roughness of the surface of the surface layer 403 is 12.9 or more and 16.201 or less, and the average length of the surface roughness curve element of the surface layer 403 It is preferably 75.4 or more and 91.8 or less.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Plasma & Fusion (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)

Abstract

L'invention concerne un rouleau de charge comprenant un matériau de mandrin, un matériau de caoutchouc disposé sur la périphérie du matériau de mandrin, et une couche de surface disposée sur la périphérie du matériau de caoutchouc. La rugosité moyenne en dix points Rz de la surface de la couche de surface est de 12,9 à 16,2 μm compris. La largeur moyenne des éléments du profil de rugosité RSm sur la surface de la couche de surface est de 75,4 à 91,8 μｍ compris.
PCT/JP2020/007354 2019-02-27 2020-02-25 Rouleau de charge WO2020175435A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019034893 2019-02-27
JP2019-034893 2019-02-27

Publications (1)

Publication Number Publication Date
WO2020175435A1 true WO2020175435A1 (fr) 2020-09-03

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PCT/JP2020/007354 WO2020175435A1 (fr) 2019-02-27 2020-02-25 Rouleau de charge

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WO (1) WO2020175435A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003316111A (ja) * 2002-04-19 2003-11-06 Canon Inc 帯電部材及び帯電装置
JP2012118510A (ja) * 2010-10-04 2012-06-21 Canon Inc 帯電部材、プロセスカートリッジ及び電子写真装置
US20150065607A1 (en) * 2013-08-27 2015-03-05 Lexmark International, Inc. Elastomeric Roll for an Electrophotographic Image Forming Device having Compressible Hollow Microparticles

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003316111A (ja) * 2002-04-19 2003-11-06 Canon Inc 帯電部材及び帯電装置
JP2012118510A (ja) * 2010-10-04 2012-06-21 Canon Inc 帯電部材、プロセスカートリッジ及び電子写真装置
US20150065607A1 (en) * 2013-08-27 2015-03-05 Lexmark International, Inc. Elastomeric Roll for an Electrophotographic Image Forming Device having Compressible Hollow Microparticles

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