Abstract: A conductive rubber roller having a rubber layer on a conductive core material. The rubber composition constituting the rubber layer contains a rubber component and a filler. The rubber component contains an epichlorohydrin rubber. The filler includes carbon black (A) having a nitrogen adsorption specific surface area (N2SA) of 20 m2/g to 40 m2/g and having a dibutyl phthalate (DBP) oil absorption of 80 ml/100 g to 100 ml/100 g and carbon black (B) having a nitrogen adsorption specific surface area (N2SA) of 15 m2/g or less and having a dibutyl phthalate (DBP) oil absorption of 40 ml/100 g or less. The carbon black (A) is in a content of 10 parts by mass to 30 parts by mass and the carbon black (B) is in a content of 20 parts by mass to 60 parts by mass or less, based on 100 parts by mass of the rubber component.

Abstract: To provide a paper feed roller which hardly causes deterioration in the frictional coefficient due to paper powder accumulation and an accompanying paper conveyance failure, and can keep excellent paper feeding for a longer period. A paper feed roller 1 including a roller main body 2 made of a rubber composition which contains EPDM, IR, and BR or SBR as rubber components, where the mass ratio R1 of the three kinds of rubber components expressed by the following equation (1): R1=MEPDM/MIR+Mx??(1) (in the equation, MEPDM represents the parts by mass of EPDM, MIR represents the parts by mass of IR, and MX represents the parts by mass of BR or SBR) is not less than 25/75 and not more than 75/25.

Abstract: An object of the present invention is to provide a charging roller (i) which includes a rubber member whose surface is subjected to a hardening treatment using a solvent containing at least an isocyanate compound and (ii) which can prevent leakage of an ionic conductive agent even if the charging roller is placed under conditions of high temperature and high humidity for a long time. The charging roller is made by forming a rubber layer on a metal core. The rubber layer is an epichlorohydrin based rubber base material to which an ionic conductive agent is added, the rubber layer being subjected to a surface treatment by applying a solution containing the isocyanate compound and heating it. This surface treatment is carried out under such conditions that a coefficient of dynamic friction at a contact portion between the rubber layer and a photoreceptor becomes 0.4 or less.

Abstract: The paper feed roller according to the present invention is made of a thermoplastic elastomer composition containing an ester thermoplastic elastomer urethane or an ether thermoplastic elastomer urethane (E) having microrubber hardness (type A) of not less than 60 and not more than 80 and a plasticizer (P) in a mass ratio E/P of 70/30 to 50/50.

Abstract: A developing device has a developer bearing member, a housing adapted to accommodate a developer, and a supply roller adapted to supply the developer within the housing for the developer bearing member. The supply roller has an outer circumferencial foam layer made of resin or rubber. The foam layer has an air permeability of 150-200 ml/cm2/s, a hardness of 50-200 N, and an average cell density of 20-40 per 25 mm width.

Abstract: An aircraft conveyor system comprising an aircraft including an aircraft cargo storage bay; and a roller mounted within the aircraft cargo storage bay, the roller including a one-piece integral body having a cylindrical shape, the entirety of the body being made solely out of a single piece of polymeric material, said body having a length extending from a first outermost end to a second outermost end and a diameter and a first and second exterior shoulders at the ends, said body including an aperture extending longitudinally along and through the center of said body from the first outermost end to the second outermost end, the aperture sized to rotatably receive an axle therethrough, the axle being for mounting the roller within the aircraft cargo storage bay, wherein the roller has a burn rate of less than 4.0 inches per minute.

Abstract: The present invention provides a base material for disk rolls which is a platy molded article for obtaining ring-shaped disks for use in a disk roll comprising a rotating shaft and ring-shaped disks fitted thereon by insertion, whereby the peripheral surface of the disks serves as a conveying surface, the base material comprising inorganic fibers having a crystallization temperature of 800-900° C., a filler, and a clay. Also disclosed is a disk roll which comprises disks cut out of the base material.

Abstract: An aircraft conveyor system comprising an aircraft including an aircraft cargo storage bay; and a roller mounted within the aircraft cargo storage bay, the roller including a one-piece integral body having a cylindrical shape, the entirety of the body being made solely out of a single piece of polymeric material, said body having a length extending from a first outermost end to a second outermost end and a diameter and a first and second exterior shoulders at the ends, said body including an aperture extending longitudinally along and through the center of said body from the first outermost end to the second outermost end, the aperture sized to rotatably receive an axle therethrough, the axle being for mounting the roller within the aircraft cargo storage bay, wherein the roller has a burn rate of less than 4.0 inches per minute.

Abstract: Method for producing silicon which is suitable as a starting material for producing a silicon melt for the fabrication of silicon blocks or silicon crystals, comprising the following steps: introducing a gaseous mixture of monosilane and hydrogen into a reactor, thermal degrading the gaseous mixture for forming silicon powder, separating the formed silicon powder produced from the gaseous mixture, and mechanical compacting the separated silicon powder with compacting rollers which having a roller jacket consisting of a ceramic material selected from graphite, glass and silicon nitride.

Abstract: A sheet feed roller prolonging sustainability of sheet feeding capability even if crushed powders are scattered. The sheet feed roller comprises a hub and an elastic layer provided on an outer peripheral surface of the hub, wherein plural grooves axially extend at specific intervals circumferentially on an outer peripheral surface of the elastic layer, a textured surface comprising mountain portions and a valley portion is formed on an outer peripheral surface of the elastic layer except for the grooves, and on bottom surfaces and wall surfaces of the grooves, a ratio of a total area of the bottom surfaces of the grooves to a total area of the outer peripheral surface of the elastic layer except for the grooves is 10% to 20%.

Abstract: The present invention provides a conductive roller having a core and a conductive foam formed on a peripheral surface thereof. The conductive foam consists of a three-phase rubber composition containing 35 to 50 parts by mass of epichlorohydrin rubber, 25 to 35 parts by mass of ethylene-propylene-diene copolymer rubber, and 25 to 30 parts by mass of acrylonitrile-butadiene rubber as a rubber component thereof. The conductive foam does not have a coating layer formed on a surface thereof. The conductive roller has an Asker C hardness, an electric resistance value, an average surface-cell diameter, and a number of surface cells set to 30 to 36°, 106 to 107 ?, 100 to 200 ?m, and 50 to 120/1.5 mm square respectively.

Abstract: A paper machine press roll comprises a core roll and a ceramics sprayed film formed on an outer periphery of the core roll, in which values of Rk and Vo which are characteristic evaluation parameters of a plateau-structure surface of the ceramics sprayed film are Rk?8.0 ?m and Vo?0.030 mm3/cm2. (Vo=(100?Mr2)×Rvk/2000 (mm3/cm2) where Rk, Mr2 and Rvk are a core level difference, a core load length ratio and a projecting valley depth, respectively which are defined in JIS B0671-2-2002 (ISO13565-2-1996).

Abstract: A process produces a conductive rubber roller having small aspect ratios of inner and outer diameters, having a stable measure of its inner diameter, having uniform cell distribution and being free from non uniformity of hardness and electrical resistance in the peripheral direction. The process has a step of continuously extruding a tube composed of a specific unvulcanized rubber composition from a rubber extruder in a microwave vulcanizing unit, and a step of foaming and vulcanizing the tube by using a microwave irradiator having a microwave irradiation zone 4 m or less in length while being transported at given speed. The foamed rubber tube has an inner diameter 20 to 35% smaller than the outer diameter of the conductive core material over the whole region in the lengthwise direction, and the conductive core material is press fitted into the foamed rubber tube without using any adhesive.

Abstract: An electroconductive roller including an electroconductive cellular material layer, comprised of a polyurethane composition, which has an average foamed cell diameter not more than 100 ?m and a variation ?D of the foamed cell diameter not more than 50 ?m. The electroconductive roller has a hardness variation ?Hs not more than 8 degrees and a circumferential non-uniformity index RMAX/RMIN in an electric resistance thereof not more than 1.3. The electroconductive cellular material layer is made of a thermosetting one-part polyurethane composition. And the polyurethane composition is cured instantly at a temperature not less than a thermosetting critical temperature for curing thereof, after it is foamed by a mechanical foaming method.

Abstract: A supply roller of a developing device for an image forming apparatus and a method of manufacturing the same are provided, which is small and exhibits excellent toner supply properties while preventing occurrence of the ghost phenomenon and toner-filming phenomenon, which cause a deterioration in image quality. The supply roller of the developing device for the image forming apparatus according to the present invention includes a shaft, and a conductive resilient member enclosing an outer circumference of the shaft. The conductive resilient member has a density of about 60 kg/m3 to about 120 kg/m3, and an outer diameter of about 8.0 mm to about 10.0 mm.

Abstract: A semi-conductive roll is provided including a shaft, a low-hardness base layer formed on an outer circumferential surface of the shaft, and a coating layer formed by coating the low-hardness base layer radially outwardly. The coating layer includes one of a rubber material and an elastomer material that is crosslinked by at least one resin crosslinking agent.

Abstract: An industrial roll includes: a substantially cylindrical core and a cover overlying the adhesive layer. The cover typically comprises a polymeric top stock layer which comprises a mixture of a polymeric material and at least one of a piezochromic material and a thermochromic material. In this configuration, the pressure and/or temperature experienced by the roll cover at any location thereon can be determined visually, without the need for external equipment.

Abstract: A roller member comprising high carbon chromium bearing steel having a carburization treatment. The bearing steel comprising a surface portion defined as a range between a surface of a rolling face of the roller member to a depth where a maximum shearing stress acts thereon, the surface portion containing carbon in a total amount comprising a range of 1.0 to 1.6 wt % and an amount of residual austenite comprising a range of 20 vol % to 35 vol % wherein a compression residual stress of the surface portion comprises a range of 150 to 1000 MPa, wherein a surface hardness of the surface portion comprises a range of 64 or higher in Rockwell C hardness, wherein an amount of carbide precipitate on the surface portion comprises a range of 10% to 25% in an area rate and each carbide particle size comprises a range of 3 ?m or less.

Abstract: A sheet feeding device comprises a sheet feeding member having an outer layer thereof, a sheet loaded on a sheet loading member being depressed on a peripheral surface of the outer layer, the sheet feeding member delivering the sheet depressed to the peripheral surface, through rotation of the peripheral surface. An inclination member having a depression portion and an inclined surface, the depression portion depressing the sheet on the peripheral surface, and a leading edge of the sheet being brought in contact with the inclined surface. The outer layer of the sheet feeding member is formed of a cross-linked rubber material which has a JIS-A hardness in a range between 25 degrees and 40 degrees, a tearing strength measured with a JIS B-type specimen, which is 10 N/mm or more, and a viscoelastic characteristic expressed by a loss tangent, which is 0.045 or less.

Abstract: An elastic member of a semiconductive polymer comprising a conductive composition containing a conductive polymer and binder polymer, wherein the elastic member satisfies both characteristics of (A) a variation of 1.5 digit or less between the electrical resistance at an applied voltage of 1V and the electrical resistance at an applied voltage of 133V under an environment of 25° C. and 50% RH, and (B) a variation of one digit or less between the electrical resistance at an applied voltage of 10V under an environment of 15° C. and 10% RH and the electrical resistance at an applied voltage of 10V under an environment of 35° C. and 85% RH.

Abstract: Printing machine having at least one impression cylinder (16), characterised in that the impression cylinder (16) has a cylinder body (44) made of a material which, in circumferential direction of the impression cylinder (16) has a linear thermal expansion coefficient of less than 2×10?6 K?1. The material may be a composite material, for example, a material containing carbon fibers, in particular a synthetic resin reinforced with carbon fibers.

Abstract: An electroconductive rubber roller (10) whose outermost layer consists of a rubber layer (1) made of a rubber composition containing an ionic-conductive rubber as a main component thereof. The surface of the rubber layer consists of an oxide film; and the rubber composition contains a dielectric loss tangent-adjusting filler to set a dielectric loss tangent of the electroconductive rubber roller to 0.1 to 1.5. Weak electroconductive carbon black and/or calcium carbonate treated with fatty acid can be used as the dielectric loss tangent-adjusting filler.

Abstract: Rolls for generally conveying sheets, such as of steel or glass over a roller typically have a steel mandrel and fiber-containing roll cover, with the fiber roll cover pressed between end plates. In a roll end assembly including the end plates there is now provided an axial shaft beyond the end plate. The shaft incorporates a roll compression means. The compression means includes a compression element which element engages the end plate. Pressure from the compression means, which may be exerted from beyond the shaft, can thereby be transmitted to the fiber roll.

Abstract: A paper machine roll cover surface layer has a mixture of an elastomeric material and HDPE particles. The HDPE particles have surface modification to improve roll cover performance.

Abstract: A toner supply roll free from occurrence of an imaging failure. The toner supply roll comprises a shaft (1) and a urethane foam layer (2) provided on an outer peripheral surface of the shaft (1), wherein when the urethane foam layer is compressed to a depth of 1 mm from an outermost surface thereof during compression thereof to a depth of 2 mm, a stress F0 occurs in the urethane foam layer and when the urethane foam layer is decompressed to a depth of 1 mm after the compression thereof to a depth of 2 mm, a stress F1 occurs in the urethane foam layer, the urethane foam layer satisfies a relation represented by the following expression (1) at a temperature of 23±3° C. at a humidity of 50±10%: F1/F0?0.7??(1) the stresses F1 and F0 being expressed by a unit of Pa.

Abstract: A roller intended to be in contact with toner particles is provided with a cured resin layer having homogeneously dispersed carbon black aggregates and having a thickness of less than 200 ?m, whereby the carbon black aggregates have a weight average size lower than 30 ?m, a DPB absorption of more than 110 ml/100 g, a BET-surface area greater than 250 m2/g, and coated with an amino silane compound.

Abstract: A charge roller utilizes a foam rubber substance where epichlorohydrin oxide rubber and an acrylonitrile butadiene rubber are mixed at a ratio of 5:95, or utilizing a crosslinking rubber substance made of epichlorohydrin oxide rubber and acrylonitrile butadiene rubber having a polar low molecular polymeric characteristic, thus allowing the charge roller to maintain a low volume resistivity of 107 ? cm to 108 ? cm. As a result, the surface of a photosensitive drum can be charged by a minimum charging voltage, to thereby significantly reduce an amount of ozone. Since a non-crosslinked low molecular polymeric substance existing at a resilient rubber is significantly reduced, the low molecular polymeric substance of the charge roller may not be migrated onto a surface of the photosensitive drum even if the charge roller is in contact with a photosensitive drum for a long time period during a stoppage of operation of an image forming apparatus.

Abstract: An industrial sponge device and a method of manufacturing the same. The sponge is made from a polyvinyl acetal material with a process in which the pores are formed by gas to provide an open pore structure having no fibrils. Additionally, the sponge is purified by an extracting process which includes alternating exposure of the partially cross-linked sponge to solutions of high pH and low pH. The sponge is sterilized by electron beam radiation to destroy micro organisms that can cause contamination of the final product. The resulting sponge material is formed into an industrial sponge having a cylindrical body and a plurality of projections extending from the body. The projections are tapered truncated cones having a cross-sectional radius that decreases with distance from the body. The extracting process permits residual amounts of calcium, zinc, and other elements to be 2 ppm or less, preferably 1 ppm or less.

Abstract: The present invention relates to paper feed rollers required to transfer papers in printers, facsimiles, copiers, etc. with accurately, and provides novel paper feed rollers which are lighter, less expensive and mass-producible with larger diameters as compared with conventional paper feed rollers. The paper feed roller according to the present invention includes a rotary shaft, a cylindrical roller portion formed by press molding a mixture of a hydraulic composition, followed by curing and hardening, and integrated with an outer periphery of the rotary shaft.

Abstract: The transfer roller of the present invention is a member comprising a shaft and an elastic foamed material layer provided on an outer circumference of the shaft and electrifying a recording medium to transfer a developer onto the above recording medium, wherein the elastic foamed material layer described above has an average cell diameter of 300 to 400 &mgr;m, and at least 80% of the whole cells has a cell diameter falling in a range of the average value ±200 &mgr;m. It is a transfer roller which provides a good transferred image having no image unevenness.

Abstract: A roll for smoothing a web, a process for making the roll and a process of repairing the roll. The roll includes a roll core having an outer surface. A covering layer is disposed on the outer surface of the roll core. The covering layer has an inner surface and an outer surface. The covering layer includes an elastic matrix material. The elastic matrix material includes a mixture of at least one thermosetting plastic and at least one thermoplastic. The process of making includes providing a roll core having an outer surface, forming an elastic covering layer including at least one thermosetting plastic and at least one thermoplastic, and applying the covering layer to the outer surface of the roll core. The process of repairing includes heating an elastic covering layer made from an elastic matrix material which comprises at least one thermosetting plastic and at least one thermoplastic, and allowing any markings in a surface of the covering layer to be filled.

Abstract: A paper-feeding roller (1) formed by cylindrically molding a thermoplastic elastomer composition containing a thermoplastic resin or a thermoplastic elastomer in which a rubber or a thermoplastic elastomer that can be crosslinked is dispersed by dynamic crosslinking. A surface layer of the paper-feeding roller (1) contains titanium oxide at not less than 1.5% nor more than 50% in a volume fraction.

Abstract: An industrial sponge device wherein the sponge is made from a polyvinyl acetal material with a process in which the pores are formed by gas to provide an open pore structure having no fibrils. Additionally, the sponge is purified by an extracting process which includes alternating exposure of the partially cross-linked sponge to solutions of high pH and low pH. The sponge is sterilized by electron beam radiation to destroy micro organisms that can cause contamination of the final product. The resulting sponge material is formed into an industrial sponge having a cylindrical body and a plurality of projections extending from the body. The projections are tapered truncated cones having a cross-sectional radius that decreases with distance from the body. The extracting process permits residual amounts of calcium, zinc, and other elements to be 2 ppm or less; preferably 1 ppm or less.

Abstract: A toner supply roller comprises a metallic core shaft and an electrically conductive elastic layer formed to surround the outer surface of the shaft. The conductive elastic layer is formed of open-cell polyurethane foam. The polyurethane foam is impregnated with an electrically conductive polymer and a binder.

Abstract: A semi-conductive roll including a shaft, a low-hardness base layer formed on an outer circumferential surface of the shaft, and a coating layer formed by coating radially outwardly of the low-hardness base layer, wherein the coating layer is formed such that a rubber material or an elastomer material is crosslinked by at least one resin crosslinking agent.

Abstract: A paper feed roller-producing method is to be provided, which enables more inexpensive mass produce of a high precision paper feed roller, with a high precision, having no connecting portion in a roller portion, by using a hydraulic composition. The method for producing a paper feed roller includes a rotary shaft and a cylindrical roller portion integrated around an outer periphery of the rotary shaft, characterized in that the roller portion is formed by extruding a hydraulic composition and curing and hardening the extrudate.

Abstract: A pressure roller for a fixing device is manufactured by extruding silicone rubber on a shaft, foaming the extruded silicone rubber, subjecting the foamed silicone rubber to primary and secondary heat treatments, polishing the heat-treated silicone rubber, and then disposing the polished silicone rubber in a resin tube. In accordance with one embodiment, the pressure roller includes a shaft, a first silicone rubber layer formed on the shaft so as to surround the shaft, a resin tube formed on the first silicone rubber layer so as to surround the shaft, the resin tube having extensions at opposite ends thereof, each extension extending beyond the opposite ends of the first silicone rubber layer, and second silicone rubber layers formed at respective opposite ends of the first silicone rubber layer between the extensions of the resin tube and the shaft. The second silicone rubber layers serve to couple the first silicone rubber layer to the resin tube.

Abstract: A paper machine roll cover surface layer has a mixture of an elastomeric material and between about 10 phr and about 24 phr UHMWPE particles.

Abstract: A roll for a paper or board machine is produced by forming a tubular roll blank by bending out of a planar sheet or by means of centrifugal casting. The roll blank is first coated with a material having a modulus of elasticity and a density lower than those of steel and the coated roll blank is turned on a lathe to a desired shape and to a desired surface quality.

Abstract: A developing roller of the present invention is made up of a nonmagnetic sleeve and a magnet roller disposed in the sleeve. The magnet roller includes a cylindrical magnet produced by molding a mixture of magnetic powder and a high polymer, and a single rare-earth magnet block mounted on the magnet at a position corresponding to a main magnetic pole for development. The cylindrical magnet is magnetized such that magnetic poles adjoining the main magnetic pole are opposite in polarity to the main pole. The main pole and each pole adjoining it make an angle of 45° or less therebetween.

Abstract: A donor roll for use in a development apparatus in an electrophotographic apparatus. The donor roll includes a core and an extruded layer comprising a fluoropolymer material. The core includes metal and has a length, and a periphery surface. The extruded layer comprising a fluoropolymer material, the layer having a length, thickness and a lumen therein for receiving at least a length of the core, the extruded layer comprising the fluoropolymer material is shrunken to substantially conform to the core. The donor roll may include a coating between the extruded layer and the core.

Abstract: A liquid mixture containing a liquid polymeric material and a granular filler is injected into a mold (11) for centrifugal molding and subjected to centrifugal molding, thereby preparing a cylindrical body including a homogeneous dispersion layer (2) having the filler homogeneously dispersed in the polymeric material and a high-density packed bed (1), formed on the outer peripheral surface side or on the inner peripheral surface side of the homogeneous dispersion layer (2), containing the aforementioned polymeric material more densely filled with the aforementioned filler. The high-density packed bed (1) is removed for exposing the surface of the homogeneous dispersion layer (2). According to this structure, the yield of the elastic cylindrical body can be improved.

Abstract: Roll for smoothing a web and method of making the roll, wherein the roll includes a hard roll core. An elastic covering layer is arranged on an outside surface of the hard roll core. The elastic covering layer includes an elastic matrix material and fibers embedded in the elastic matrix material. At least some of the fibers have a diameter which is less than 800 nm. A surface of the elastic covering layer has an extremely high smoothness. The method includes introducing the fibers into the elastic matrix material to form the elastic covering layer and coupling the elastic covering layer with the hard roll core.

Abstract: A paper machine roll cover surface layer has a mixture of an elastomeric material and HDPE particles. The HDPE particles have surface modification to improve roll cover performance.

Abstract: A roll for a paper or board machine is produced by forming a tubular roll blank by bending out of a planar sheet or by means of centrifugal casting. The roll blank is first coated with a material having a modulus of elasticity and a density lower than those of steel and the coated roll blank is turned on a lathe to a desired shape and to a desired surface quality.

Abstract: The invention concerns a coating bar for pulp and paper manufacture, comprising a substrate coated over at least the greater part of its surface with a coat comprising a ceramic, characterised in that the coat consists of a mixture of ceramics, the coat having a wettability angle between 30° and 90°, and porosity less than 5%, the size of the pores being less than 5 &mgr;m.

Abstract: A core for winding a continuous web of material. In one embodiment of the present invention, the core includes a first inner portion and a second outer portion. The inner and outer portions once had the same inner diameters. However, the outer portion is resized to having a second inner diameter so that it may overlap the first inner portion. A workpiece, which will be cut into a plurality of second outer portions, is heated. The heated workpiece is then placed over a plug which has an outer diameter that substantially corresponds to the desired inner diameter for the second outer portions. By placing the heated workpiece over the plug, the workpiece is stretched to have the desired second inner diameter. The workpiece is then cut into a plurality of second outer portions of the desired width. Because the inner diameter of each second portion is now larger, they are permitted to overlap a corresponding first inner portion.

Abstract: Roller being intended to be in contact with toner particles, said roller being provided with a cured resin layer comprising carbon black aggregates and having a thickness of less than 200 &mgr;m,

Abstract: In a conductive rubber roller including a conductive support and a rubber layer, the rubber layer includes a component (A), an epichlorohydrin rubber containing 40 mol % or more of ethylene oxide, and a component (B), an acrylonitrile butadiene rubber component having an acrylonitrile content of 20% by weight or less. The component (A) is in a proportion of 5 or more to less than 25 in weight ratio, based on a total weight of the components (A) and (B).

Abstract: A low inertia, low friction roller (12), which is particularly adapted for handling relatively high speed, relatively fragile running webs, comprises an inner tube (16) and an outer tube (14). The outer tube (14) is disposed substantially coaxially about the inner tube (16) and is rotatable with respect to the inner tube (16). An annular gap (46) is defined between the inner and outer tubes and has a first portion that is supplied with a restricted flow of a pressurized compressible fluid and that is adjacent the portion of the outer tube about which the web passes. A second portion of the annular gap is circumferentially spaced from the first portion of the annular gap and communicates with a fluid exhaust passage (66) in the inner tube.