WO2014136829A1 - ローラ、その製造方法およびそれを用いた画像形成装置 - Google Patents
ローラ、その製造方法およびそれを用いた画像形成装置 Download PDFInfo
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- WO2014136829A1 WO2014136829A1 PCT/JP2014/055600 JP2014055600W WO2014136829A1 WO 2014136829 A1 WO2014136829 A1 WO 2014136829A1 JP 2014055600 W JP2014055600 W JP 2014055600W WO 2014136829 A1 WO2014136829 A1 WO 2014136829A1
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- roller
- layer
- foam
- foam layer
- cut
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- 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
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- 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
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- 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
- G03G15/0806—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer on a donor element, e.g. belt, roller
- G03G15/0818—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer on a donor element, e.g. belt, roller characterised by the structure of the donor member, e.g. surface properties
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- 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
- G03G15/14—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base
- G03G15/16—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer
- G03G15/1665—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer by introducing the second base in the nip formed by the recording member and at least one transfer member, e.g. in combination with bias or heat
- G03G15/167—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer by introducing the second base in the nip formed by the recording member and at least one transfer member, e.g. in combination with bias or heat at least one of the recording member or the transfer member being rotatable during the transfer
- G03G15/1685—Structure, details of the transfer member, e.g. chemical composition
Definitions
- the present invention relates to a roller, a method of manufacturing the same, and an image forming apparatus using the roller.
- the present invention relates to a roller, a manufacturing method thereof, and an image forming apparatus using the roller.
- a transfer roller, a developing roller, a toner supply roller, a charging roller, a cleaning roller, an intermediate transfer roller, and a belt are used in each image forming process.
- roller member As such a roller member, a conventional structure in which an elastic layer made of rubber, a polymer elastomer, a polymer foam or the like provided with conductivity by blending a conductive agent on the outer periphery of a shaft is used as a basic structure. In order to obtain surface roughness, conductivity, hardness, and the like, those having a single-layer or multiple-layer coating on the outer periphery thereof are used.
- Patent Document 1 includes a cored bar, a base provided on the surface of the core, and a sealing layer provided on the peripheral surface.
- a conductive roller is disclosed which is made of a conductive flexible polyurethane foam and in which the opening of air bubbles of the conductive flexible polyurethane foam on the peripheral surface of the substrate is closed by a sealing layer.
- the elastic layer to be carried on the outer periphery of the shaft is formed of a foam layer, and the cutting process is applied to the end in the roller axial direction in order to adjust the size and shape of the roller, the foam layer exposed by the cutting In some cases, cutting residue was generated from the end.
- a cutting residue is transferred to a photoconductor or paper in the image forming apparatus, it causes a problem of an image, which is a problem.
- there is a method of performing air blowing or a wipe blowing process but the cutting residue cannot be completely removed.
- an object of the present invention is to solve the above problems and suppress the generation of cutting residue from the cut surface of the end portion of the foam layer in the axial direction of the roller, in particular, a conductive roller, a manufacturing method thereof, and an image using the same. It is to provide a forming apparatus.
- the roller of the present invention is a roller comprising a shaft, a foam layer sequentially provided on the outer periphery of the shaft, and at least one coating layer. Both ends of the foam layer and the paint film layer in the roller axial direction are cut, and a cut-off layer for covering at least the foam layer is provided on the cut surface of the cut foam layer and the paint film layer. It is characterized by being.
- the sealing layer is preferably made of a liquid adhesive or a hot melt adhesive.
- the foam layer is preferably made of polyurethane foam, and the density of the polyurethane foam is particularly preferably in the range of 0.1 to 0.7 g / cm 3 .
- the roller of the present invention is preferably a conductive roller.
- the manufacturing method of the roller of the present invention in manufacturing the roller of the present invention, the foamed layer is formed by molding, the at least one coating layer is applied to the outer periphery of the formed foam layer, and both the foam layer and both ends of the coating layer in the roller axial direction are formed. After cutting, the sealing layer is provided on the cut surfaces of the cut foam layer and the coating layer so as to cover at least the foam layer.
- the image forming apparatus of the present invention is characterized in that the roller of the present invention is mounted.
- FIG. 1 is a partial cross-sectional view illustrating a configuration example of an image forming apparatus of the present invention.
- FIG. 1 shows a longitudinal sectional view of an example of the roller of the present invention.
- the roller 10 of the present invention includes a shaft 1, a foam layer 2 carried on the outer periphery thereof, at least one coating layer coated on the outer periphery of the foam layer, and in the illustrated example, one layer of coating.
- both ends of the foam layer 2 and at least one coating layer 3 in the roller axial direction are cut, and the cut foam layer 2 and at least one coating layer 3 are cut.
- a sealing layer 4 that covers at least the foam layer 2 is provided on the surface.
- the sealing layer 4 may be formed of any material as long as it can cover at least the cut surface of the foamed layer 2, thereby obtaining an effect of suppressing the generation of cutting residue.
- a washer or the like can be used in addition to a liquid adhesive or a hot melt adhesive.
- a hot melt adhesive is preferable because the formation of the sealing layer is easy.
- the liquid adhesive include one-component or two-component solvent-based, solvent-free, or water-based adhesives.
- the material include urethane, acrylic, vinyl acetate, epoxy, silicon, and synthetic rubber. In the case of using polyurethane foam, urethane and synthetic rubber are particularly preferable from the viewpoint of flexibility and compatibility.
- the sealing layer 4 can be formed by applying a liquid adhesive using a dispenser, a stamp, a spray, a knife coater, or the like, followed by volatile curing, heat curing, or ultraviolet curing.
- a liquid adhesive using a dispenser, a stamp, a spray, a knife coater, or the like
- volatile curing, heat curing, or ultraviolet curing include a method of scraping the paint supplied to the cut surface with a dispenser with a doctor knife or the like, a method of spray-coating the cut surface, and the like.
- a general method may be used as appropriate.
- the hot melt adhesive is a sheet-like adhesive, and examples of the material include polyurethane, vinyl acetate, polyolefin, synthetic rubber, and the like. In view of compatibility and compatibility, urethane and synthetic rubber are preferable.
- the sealing layer 4 is formed by applying, for example, hot pressing, high frequency, or ultrasonic waves in a state where the hot melt adhesive cut into a shape corresponding to the cut surface is in contact with the cut surface. be able to.
- a general-purpose metal such as stainless steel or aluminum
- a general-purpose resin such as polypropylene (PP) or polyamide (PA66, PA6, PA12) can be used and fitted to the shaft.
- the sealing layer 4 can be formed by adhering to the cut surface with an adhesive.
- an adhesive used at this time, a general metal-resin instantaneous adhesive is preferable in terms of process time.
- Aron Alpha registered trademark
- As the application method for example, a method in which a dispenser is applied to a cut surface in a spot shape (point adhesion), a method in which a paint supplied to the cut surface by a dispenser or the like is scraped with a doctor knife or the like (overall adhesion), etc. Is mentioned.
- the sealing layer 4 only needs to cover at least the cut surface of the foam layer 2, so that it is equal to or larger than the outer diameter of the roller and smaller than the outer diameter of the roller. What is necessary is just to form by a diameter. Although it depends on the size of the roller, specifically, it may be formed with an outer diameter of [(roller outer diameter) ⁇ 0 ⁇ m to (roller outer diameter) ⁇ 250 ⁇ m], for example. Moreover, the thickness of the sealing layer 4 should just be what can completely cover the cut surface of the foaming layer 2, and in the case of a coating film etc., it can be about 120 micrometers or less, for example.
- the shaft 1 is not particularly limited as long as it has good conductivity, and any one can be used.
- a steel material such as sulfur free-cutting steel is plated with nickel, zinc or the like.
- Metal shafts made of solid materials such as metal, iron, stainless steel, and aluminum, metal shafts such as metal cylinders hollowed inside, plastic shafts with good conductivity, etc. can be used. .
- the foam layer 2 is made of a foam. Specifically, for example, polyurethane, silicone rubber, ethylene-propylene-diene rubber (EPDM), acrylonitrile-butadiene rubber (NBR), natural rubber, styrene-butadiene rubber (SBR). ), Butadiene rubber, isoprene rubber, polynorbornene rubber, butyl rubber, chloroprene rubber, acrylic rubber, epichlorohydrin rubber (ECO), ethylene-vinyl acetate copolymer (EVA), and mixtures thereof. Preferably, it shall consist of polyurethane foam.
- the foam constituting the foamed layer 2 is formed by chemically foaming the elastomer using a foaming agent or by mechanically entraining and foaming air like a polyurethane foam.
- the bubbles in the foam are closed cells.
- a method of foaming the elastomer raw material by mechanical stirring is suitably employed.
- the polyurethane raw material for forming the polyurethane foam suitably used for the foamed layer 2 is not particularly limited as long as it contains a urethane bond in the resin.
- the polyisocyanate constituting the polyurethane raw material aromatic isocyanate or a derivative thereof, aliphatic isocyanate or a derivative thereof, alicyclic isocyanate or a derivative thereof is used.
- aromatic isocyanate or a derivative thereof is preferable, and tolylene diisocyanate or a derivative thereof, diphenylmethane diisocyanate or a derivative thereof is particularly preferably used.
- Tolylene diisocyanate or derivatives thereof include crude tolylene diisocyanate, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, a mixture of 2,4-tolylene diisocyanate and 2,6-tolylene diisocyanate, these Urea-modified products, burette-modified products, carbodiimide-modified products, urethane-modified products modified with polyols, and the like are used.
- diphenylmethane diisocyanate or a derivative thereof for example, diphenylmethane diisocyanate or a derivative thereof obtained by phosgenating diaminodiphenylmethane or a derivative thereof is used.
- Examples of the derivatives of diaminodiphenylmethane include polynuclear bodies, and pure diphenylmethane diisocyanate obtained from diaminodiphenylmethane, polymeric diphenylmethane diisocyanate obtained from a polynuclear body of diaminodiphenylmethane, and the like can be used.
- Regarding the number of functional groups of polymeric diphenylmethane diisocyanate a mixture of pure diphenylmethane diisocyanate and polymeric diphenylmethane diisocyanate having various functional groups is usually used, and the average number of functional groups is preferably 2.05 to 4.00, more preferably 2. 50 to 3.50 are used.
- Derivatives obtained by modifying these diphenylmethane diisocyanates or derivatives thereof such as urethane modified products modified with polyols, dimers formed by uretidione formation, isocyanurate modified products, carbodiimide / uretonimine modified products, allophanate modified products , Urea-modified products, burette-modified products, and the like can also be used. Also, several types of diphenylmethane diisocyanate and its derivatives can be blended and used.
- Polyol components constituting the polyurethane raw material include polyether polyols obtained by addition polymerization of ethylene oxide and propylene oxide, polytetramethylene ether glycol, polyester polyols obtained by condensing acid components and glycol components, polyester polyols obtained by ring-opening polymerization of caprolactone, Polycarbonate diol or the like can be used.
- Polyether polyols obtained by addition polymerization of ethylene oxide and propylene oxide are, for example, water, propylene glycol, ethylene glycol, glycerin, trimethylolpropane, hexanetriol, triethanolamine, diglycerin, pentaerythritol, ethylenediamine, methylglucotite, Examples include aromatic diamines, sorbitol, sucrose, phosphoric acid and the like as starting materials, and addition polymerization of ethylene oxide and propylene oxide. Particularly, water, propylene glycol, ethylene glycol, glycerin, trimethylolpropane, Those starting from hexanetriol are preferred.
- the ratio of ethylene oxide is preferably 2 to 95% by mass, more preferably 5 to 90% by mass.
- those having ethylene oxide added to the terminal are preferably used.
- the arrangement of ethylene oxide and propylene oxide in the molecular chain is preferably random.
- the molecular weight of the polyether polyol is bifunctional when water, propylene glycol or ethylene glycol is used as a starting material, and preferably has a weight average molecular weight in the range of 300 to 6000, particularly in the range of 400 to 3000. preferable.
- glycerin, trimethylolpropane and hexanetriol are used as starting materials, they are trifunctional and preferably have a weight average molecular weight in the range of 900 to 9000, particularly preferably in the range of 1500 to 6000. Further, a bifunctional polyol and a trifunctional polyol can be appropriately blended and used.
- Polytetramethylene ether glycol is preferably used, for example, having a weight average molecular weight of 400 to 4000, particularly 650 to 3000, obtained by cationic polymerization of tetrahydrofuran. It is also preferable to blend polytetramethylene ether glycols having different molecular weights. Furthermore, polytetramethylene ether glycol obtained by copolymerizing alkylene oxide such as ethylene oxide or propylene oxide can also be used. It is also preferable to use a blend of polytetramethylene ether glycol and a polyether polyol obtained by addition polymerization of ethylene oxide and propylene oxide.
- polytetramethylene ether glycol addition polymerization of ethylene oxide and propylene oxide was performed. It is preferably used such that the ratio with the polyether polyol is in the range of 95: 5 to 20:80, particularly in the range of 90:10 to 50:50.
- a polymer polyol obtained by modifying the polyol with acrylonitrile, a polyol obtained by adding melamine to the polyol, a diol such as butanediol, a polyol such as trimethylolpropane, or a derivative thereof can be used in combination.
- the polyol may be prepolymerized with polyisocyanate in advance, and as a method thereof, the polyol and polyisocyanate are put in a suitable container and sufficiently stirred, and 30 to 90 ° C., more preferably 40 to 70 ° C. A method of keeping the temperature for 6 to 240 hours, more preferably 24 to 72 hours can be mentioned.
- the ratio of the amount of polyol and polyisocyanate is preferably adjusted so that the isocyanate content of the resulting prepolymer is 4 to 30% by mass, more preferably 6 to 15% by mass.
- the isocyanate content is less than 4% by mass, the stability of the prepolymer is impaired, and the prepolymer may be cured during storage, making it impossible to use. Further, when the isocyanate content exceeds 30% by mass, the content of polyisocyanate that has not been prepolymerized increases, and this polyisocyanate undergoes a prepolymerization reaction with a polyol component used in a subsequent polyurethane curing reaction. The effect of using the prepolymer method is diminished because it cures by a reaction mechanism similar to the one-shot manufacturing method that does not pass.
- diols such as ethylene glycol and butanediol
- polyols such as trimethylolpropane and sorbitol, and those Derivatives can also be used.
- conductive agents such as ionic conductive agents and electronic conductive agents
- fillers such as carbon black and inorganic carbonates, antioxidants such as phenol and phenylamine, low friction agents, charge control agents, etc.
- ionic conductive agents examples include tetraethylammonium, tetrabutylammonium, dodecyltrimethylammonium (eg, lauryltrimethylammonium), hexadecyltrimethylammonium, octadecyltrimethylammonium (eg, stearyltrimethylammonium), benzyltrimethylammonium, modified fatty acid dimethylethyl Perchlorates such as ammonium, chlorates, hydrochlorides, bromates, iodates, borofluorides, sulfates, ethyl sulfates, carboxylates, ammonium salts such as sulfonates, lithium, Perchlorates, chlorates, hydrochlorides, bromates, iodates, borofluorides, trifluoromethyls of alkali metals and alkaline earth metals such as sodium, potassium, calcium and magnesium Sulfate, and sulfonic
- Examples of the electronic conductive agent include conductive carbon such as ketjen black and acetylene black; carbon for rubber such as SAF, ISAF, HAF, FEF, GPF, SRF, FT, and MT; for ink subjected to oxidation treatment Examples thereof include carbon, pyrolytic carbon, natural graphite, and artificial graphite; conductive metal oxides such as tin oxide, titanium oxide, and zinc oxide; metals such as nickel, copper, silver, and germanium. These conductive agents may be used alone or in combination of two or more.
- the blending amount is not particularly limited and may be appropriately selected as desired. Usually, the proportion is 0.1 to 40 parts by mass, preferably 0.3 to 20 parts by mass with respect to 100 parts by mass of the polyurethane raw material. It is.
- Catalysts used for the curing reaction of polyurethane raw materials include monoamines such as triethylamine and dimethylcyclohexylamine, diamines such as tetramethylethylenediamine, tetramethylpropanediamine, and tetramethylhexanediamine, pentamethyldiethylenetriamine, pentamethyldipropylenetriamine, tetra Triamines such as methylguanidine, triethylenediamine, dimethylpiperazine, methylethylpiperazine, cyclic amines such as methylmorpholine, dimethylaminoethylmorpholine, dimethylimidazole, dimethylaminoethanol, dimethylaminoethoxyethanol, trimethylaminoethylethanolamine, methylhydroxy Alcohol amines such as ethylpiperazine, hydroxyethylmorpholine, Ether amines such as bis (dimethylaminoethyl) ether and ethylene
- a silicone foam stabilizer and various surfactants to the polyurethane raw material in order to stabilize the cells of the foam material.
- a dimethylpolysiloxane-polyoxyalkylene copolymer or the like is preferably used, and particularly preferably one comprising a dimethylpolysiloxane moiety having a molecular weight of 350 to 15000 and a polyoxyalkylene moiety having a molecular weight of 200 to 4000.
- the molecular structure of the polyoxyalkylene moiety is preferably an addition polymer of ethylene oxide or a co-addition polymer of ethylene oxide and propylene oxide, and its molecular terminal is preferably ethylene oxide.
- the surfactant include cationic surfactants, anionic surfactants, ionic surfactants such as amphoteric, nonionic surfactants such as various polyethers and various polyesters.
- the blending amount of the silicone foam stabilizer and various surfactants is preferably 0.1 to 10 parts by mass, more preferably 0.5 to 5 parts by mass with respect to 100 parts by mass of the polyurethane raw material.
- the blending amount of the silicone foam stabilizer and various surfactants is preferably 0.1 to 10 parts by mass, more preferably 0.5 to 5 parts by mass with respect to 100 parts by mass of the polyurethane raw material.
- the polyurethane foam used in the present invention preferably has a density in the range of 0.1 to 0.7 g / cm 3 , more preferably 0.50 to 0.65 g / cm 3 .
- a density in the range of 0.1 to 0.7 g / cm 3 more preferably 0.50 to 0.65 g / cm 3 .
- cutting residue is likely to occur, and therefore the application of the present invention is effective. If the density is too low, the foam becomes coarse, and if it is too high, the roller performance deteriorates.
- the Asker C hardness of the polyurethane foam is preferably 15 to 70 °, more preferably 15 to 45 °.
- a conventionally used method such as a mechanical floss method, a water foam method, or a foaming agent floss method can be used.
- a mechanical floss method in which foaming is performed by mechanical stirring while mixing an inert gas.
- the inert gas used in the mechanical froth method may be an inert gas in the polyurethane reaction, and in addition to inert gases in a narrow sense such as helium, argon, xenon, radon, krypton, nitrogen, carbon dioxide, drying Examples thereof include gases that do not react with polyurethane raw materials such as air.
- a polyurethane foam in which a self-skin layer (thin layered film) is formed on a portion in contact with the metal mold can be obtained by casting the foamed polyurethane material into a metal mold or the like and curing it. At that time, the moldability can be imparted to the metal mold by a method such as coating the inner surface of the metal mold with a fluororesin or the like.
- the molding conditions of the foam layer 2 are not particularly limited, and can follow normal conditions.
- foaming of the polyurethane raw material is started at a temperature in the range of 15 to 80 ° C., preferably 20 to 65 ° C.
- the foamed layer 2 can be obtained by curing at a temperature of about 70 to 120 ° C. and then removing the mold.
- At least one or more coating layers are formed on the outer periphery of the foam layer 2.
- a single coating layer 3 as a surface layer forming the roller surface is provided on the outer periphery of the foam layer 2.
- a layer may be provided, and another functional layer may be added.
- the surface layer can be formed of a solvent-based paint such as urethane, acrylic, acrylurethane, or fluorine, and the surface roughness is adjusted by containing spherical fine particles such as urethane, acrylic, and silica. be able to.
- the surface roughness of such a surface layer is preferably 2 ⁇ m or less, and particularly preferably in the range of 0.5 to 1.5 ⁇ m in terms of JIS arithmetic average roughness Ra.
- desired electroconductivity can be provided by containing suitably the ionic conductive agent and electronic conductive agent which were mentioned above as a electrically conductive agent.
- the thickness of the surface layer is not particularly limited, but can usually be about 1 to 50 ⁇ m, particularly about 1 to 40 ⁇ m.
- the intermediate layer may be composed of a water-based paint containing a conductive agent, and as the water-based paint, any one or more selected from the group consisting of rubber-based, urethane-based, and acrylic-based materials is preferable.
- any one or more selected from the group consisting of rubber-based, urethane-based, and acrylic-based materials is preferable.
- rubber type natural rubber (NR), chloroprene rubber (CR), nitrile rubber (NBR), latex such as styrene butadiene rubber (SBR), etc.
- urethane type emulsion and dispersion
- ether type ether type
- ester type As the acrylic, an emulsion such as acrylic or acrylic styrene can be suitably used.
- the thing similar to what was mentioned previously about the foaming layer 2 can be used, and it does not restrict
- Other vulcanizing agents, vulcanization accelerators, anti-aging agents, and the like can be appropriately added to the intermediate layer as desired.
- the thickness of the intermediate layer is usually in the range of 10 to 100 ⁇ m, particularly 30 to 80 ⁇ m.
- the thickness is less than 10 ⁇ m, the solvent shielding effect on the foam layer and the sealing effect for preventing the seepage of contaminants from the lower layer side are insufficient, and the desired surface roughness cannot be imparted due to the solvent leakage.
- the thickness exceeds 100 ⁇ m, the intermediate layer cannot follow the softness of the foamed layer 2, and cracking, peeling, etc. occur, the roller itself becomes hard, and there is a problem in terms of roller performance such as toner damage. May occur.
- the intermediate layer can be formed of one layer or two or more layers by applying the water-based paint on the foam layer 2.
- the coating method is not particularly limited, and known methods such as dip coating, spray coating, and roll coater coating can be used, and dip coating is preferably used.
- the micro hardness of the intermediate layer is preferably in the range of 10 to 45 ° in the case of a film thickness of 500 ⁇ m. By setting the hardness to this level, the desired roller surface can be obtained with respect to the finally obtained roller surface. Hardness can be achieved. Such micro hardness can be measured by, for example, a micro rubber hardness meter MD-1 type.
- the roller of the present invention is suitable as a conductive roller used in an electrophotographic image forming apparatus and the like.
- various rollers such as a developing roller, a charging roller, a transfer roller, a toner supply roller, and a cleaning roller are used. It can be suitably used as a roller member, and is particularly useful as a developing roller.
- the roller of the present invention can be manufactured as follows. That is, first, a foam layer is formed on the outer periphery of the shaft by molding. Next, at least one coating layer, specifically, for example, the above-described surface layer is applied directly or the intermediate layer and the surface layer are applied and formed on the formed foam layer. Next, both end portions in the roller axial direction of the formed foam layer and coating layer are cut. Here, when cutting both ends of the foam layer and the coating layer in the roller axial direction, from the viewpoint of the appearance of the roller, when cutting off the roller end swollen by molding, adjusting the roller dimensions, etc. Is mentioned. Next, the roller of the present invention can be obtained by providing a sealing layer on the cut surfaces of the cut foam layer and the coating film layer so as to cover at least the foam layer by the various methods described above.
- FIG. 2 shows a partial sectional view of an example of the image forming apparatus of the present invention.
- an electrostatic image is formed by adhering an image forming body 21 such as a photoconductor for holding an electrostatic latent image and a toner 20 held on the surface in contact with the image forming body 21.
- a developing roller 10 that visualizes the latent image and a toner supply roller 22 that supplies toner 20 to the developing roller 10 are provided.
- the toner 20 is supplied from the toner container 23 to the toner supply roller 22 and the developing roller.
- Image formation is performed by a series of processes of conveying to the image forming body 21 through 10.
- an electrostatic latent image is formed on the image forming body 21 by an exposure device (not shown).
- the toner supply roller 22, the developing roller 10, and the image forming body 21 rotate in the direction of the arrow in the figure, so that the toner 20 on the toner supply roller 22 passes through the developing roller 10 and the image forming body 21.
- Sent to. The toner 20 on the developing roller 10 is adjusted to a uniform thin layer by the stratification blade 24, and the toner 20 is rotated from the developing roller 10 to the image forming body 21 by rotating while the developing roller 10 and the image forming body 21 are in contact with each other. And the latent image is visualized.
- the toner 20 attached to the latent image is transferred onto a recording medium such as paper by a transfer roller 26, and the toner 20 remaining on the image forming body 21 after the transfer is removed by a cleaning blade 28 of the cleaning unit 27.
- the image forming apparatus of the present invention can further be provided with known components that are usually used in the image forming apparatus (not shown).
- polyurethane foam was supported on the outer periphery of a shaft ( ⁇ 8 mm, length 260 mm, material: sulfur free cutting steel) by a mechanical floss method.
- the density of this polyurethane foam was 0.60 g / cm 3 .
- an isocyanate component prepolymerized isocyanate TDI + polyether polyol
- 20 parts by mass of a polyol component polyether polyol
- 2 parts by mass of carbon black acetylene black
- an ionic conductive agent peroxide
- a polyurethane raw material consisting of 0.2 parts by mass of sodium chlorate was prepared, and this polyurethane raw material was mechanically stirred by a mixer and mixed with dry air to be foamed.
- This polyurethane foam raw material was cast into a metal cylindrical split mold in which a hole for penetrating the shaft was provided at the end, and a metal cap for supporting the shaft was installed.
- the cured polyurethane foam was removed from the mold, and a CR rubber latex paint blended with carbon black (Ketjen black) was applied by dip coating to form an intermediate layer having a thickness of 60 ⁇ m on the outer periphery of the foamed layer.
- a polyurethane solvent-based paint containing D 50 10 ⁇ m spherical polyurethane particles and carbon black (acetylene black) was dip coated to form a surface layer having a film thickness of 15 ⁇ m.
- the both ends of the roller main body in the roller axial direction of the roller obtained above were cut so that the dimensions of the roller main body were 11.5 mm and length 240 mm.
- the sealing layers shown in Tables 1 to 3 below were respectively formed on the cut surface of the roller body to obtain test rollers of Examples 1 to 12.
- the sealing layer was formed by applying by spray coating in the range of ⁇ 11.5 mm of the cut surface and heating.
- a hot melt adhesive a sheet-like one was cut into a ring shape having an outer diameter of ⁇ 11.5 mm, attached, and welded by a hot press method.
- a metal (stainless steel) and resin (PP) one having an outer diameter of 11.5 mm is used, and an adhesive (Aron Alpha (registered trademark) (for general use)) is applied to the cut surface with a dispenser. It was formed by applying and adhering to the shape. A roller having no sealing layer formed on the cut surface of the roller body was used as a conventional test roller.
- HM712 (thickness 50 ⁇ m), manufactured by Cemedine Co., Ltd. * 10) HM650-2 (thickness 50 ⁇ m), manufactured by Cemedine Co., Ltd.
- a roller was produced in the same manner as in Example 1 except that the density of the polyurethane foam constituting the foamed layer was changed as shown in Table 4 below, and both end portions in the roller axial direction of the roller body were cut. The dimensions of the part were ⁇ 11.5 mm and length 240 mm. Thereafter, a sealing layer shown in Table 4 below was formed on the cut surface of the roller main body in the same manner as in Example 1 to obtain test rollers of Examples 13 to 18. The results of evaluating the obtained test rollers in the same manner as in Example 1 are also shown in Table 4 below.
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
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- Electrophotography Configuration And Component (AREA)
- Dry Development In Electrophotography (AREA)
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Abstract
Description
前記発泡層および前記塗膜層のローラ軸方向両端部が裁断されてなり、かつ、裁断された該発泡層および該塗膜層の裁断面に、少なくとも該発泡層を被覆する目止め層が設けられていることを特徴とするものである。
前記発泡層を型成形により形成し、形成された該発泡層の外周に前記少なくとも一層以上の塗膜層を塗布形成し、形成された該発泡層および該塗膜層のローラ軸方向両端部を裁断した後、裁断された該発泡層および該塗膜層の裁断面に、少なくとも該発泡層を被覆するよう前記目止め層を設けることを特徴とするものである。
図1に、本発明のローラの一例の長手方向断面図を示す。図示するように、本発明のローラ10は、シャフト1と、その外周に担持された発泡層2と、発泡層の外周に被覆された少なくとも一層以上の塗膜層、図示例では1層の塗膜層3と、を備えている。
まず、シャフト(φ8mm、長さ260mm、材質:硫黄快削鋼)の外周に、メカニカルフロス法によりポリウレタンフォームを担持させた。このポリウレタンフォームの密度は、0.60g/cm3であった。
得られた各供試ローラを、市販のレーザービームプリンタ(キヤノン(株)製 LBP7200C)に組み込んで、100枚の印字耐久試験を実施した。結果は、印字画像を目視にて評価し、裁断面から発生する裁断カスに起因する画像不具合の有無(不具合が生じなかった場合を○、生じた場合を×とした)、および、印字試験後の目止め層における接着剤の剥がれなどの不具合の有無につき評価した。その結果を、下記の表1~3中に併せて示す。
2 発泡層
3 塗膜層
4 目止め層
10 ローラ(現像ローラ)
20 トナー
21 画像形成体
22 トナー供給ローラ
23 トナー収容部
24 成層ブレード
25 帯電ローラ
26 転写ローラ
27 クリーニング部
28 クリーニングブレード
Claims (7)
- シャフトと、該シャフトの外周に順次設けられた発泡層および少なくとも一層以上の塗膜層と、を備えるローラにおいて、
前記発泡層および前記塗膜層のローラ軸方向両端部が裁断されてなり、かつ、裁断された該発泡層および該塗膜層の裁断面に、少なくとも該発泡層を被覆する目止め層が設けられていることを特徴とするローラ。 - 前記目止め層が、液状接着剤またはホットメルト接着剤からなる請求項1記載のローラ。
- 前記発泡層がポリウレタンフォームからなる請求項1記載のローラ。
- 前記ポリウレタンフォームの密度が0.1~0.7g/cm3の範囲である請求項3記載のローラ。
- 導電性ローラである請求項1記載のローラ。
- 請求項1記載のローラを製造するにあたり、
前記発泡層を型成形により形成し、形成された該発泡層の外周に前記少なくとも一層以上の塗膜層を塗布形成し、形成された該発泡層および該塗膜層のローラ軸方向両端部を裁断した後、裁断された該発泡層および該塗膜層の裁断面に、少なくとも該発泡層を被覆するよう前記目止め層を設けることを特徴とするローラの製造方法。 - 請求項1記載のローラが搭載されていることを特徴とする画像形成装置。
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CN201480012467.6A CN105027007A (zh) | 2013-03-05 | 2014-03-05 | 辊及其制造方法、和使用该辊的图像形成设备 |
JP2015504357A JPWO2014136829A1 (ja) | 2013-03-05 | 2014-03-05 | ローラ、その製造方法およびそれを用いた画像形成装置 |
EP14761042.2A EP2966508A4 (en) | 2013-03-05 | 2014-03-05 | ROLL, METHOD FOR THE MANUFACTURE THEREOF AND PICTURE PRODUCTION DEVICE THEREWITH |
US14/771,248 US20160018751A1 (en) | 2013-03-05 | 2014-03-05 | Roller, method for manufacturing same and image forming device using same |
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JP2013042577 | 2013-03-05 |
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EP (1) | EP2966508A4 (ja) |
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Cited By (2)
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WO2016035691A1 (ja) * | 2014-09-04 | 2016-03-10 | 株式会社ブリヂストン | ローラおよびそれを用いた画像形成装置 |
US10025222B2 (en) | 2014-09-04 | 2018-07-17 | Bridgestone Corporation | Roller and image forming apparatus using same |
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EP0822466B1 (en) * | 1992-09-28 | 2006-03-01 | Fuji Xerox Co., Ltd. | Developing device for an image forming apparatus |
JP2007298586A (ja) * | 2006-04-28 | 2007-11-15 | Kyocera Mita Corp | 現像装置及びこれを搭載した画像形成装置 |
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2014
- 2014-03-05 WO PCT/JP2014/055600 patent/WO2014136829A1/ja active Application Filing
- 2014-03-05 US US14/771,248 patent/US20160018751A1/en not_active Abandoned
- 2014-03-05 JP JP2015504357A patent/JPWO2014136829A1/ja active Pending
- 2014-03-05 CN CN201480012467.6A patent/CN105027007A/zh active Pending
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JPH09262912A (ja) | 1996-03-28 | 1997-10-07 | Inoac Corp | 導電性ローラ及びその製造方法 |
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WO2016035691A1 (ja) * | 2014-09-04 | 2016-03-10 | 株式会社ブリヂストン | ローラおよびそれを用いた画像形成装置 |
JP2016053672A (ja) * | 2014-09-04 | 2016-04-14 | 株式会社ブリヂストン | ローラおよびそれを用いた画像形成装置 |
US9874832B2 (en) | 2014-09-04 | 2018-01-23 | Bridgestone Corporation | Roller and image forming apparatus using same |
US10025222B2 (en) | 2014-09-04 | 2018-07-17 | Bridgestone Corporation | Roller and image forming apparatus using same |
Also Published As
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EP2966508A1 (en) | 2016-01-13 |
EP2966508A4 (en) | 2016-03-02 |
CN105027007A (zh) | 2015-11-04 |
JPWO2014136829A1 (ja) | 2017-02-16 |
US20160018751A1 (en) | 2016-01-21 |
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