Abstract: Provided is a rubber bearing formed from a polychloroprene composition and having higher ozone resistance. The rubber bearing comprises a laminate prepared by alternately laminating a plurality of soft layers having rubber elasticity and a plurality of hard layers having rigidity, and a covering layer covering an outer peripheral part of the laminate. The soft layer comprises a rubber composition containing a polychloroprene, and the covering layer comprises a blend rubber composition containing 30 to 95 parts by mass of a polychloroprene and 70 to 5 parts by mass of an elastomer other than the polychloroprene.

Abstract: The present invention provides a sheet conveying roller which requires a smaller number of ingredients than a prior art sheet conveying roller, has an excellent weather resistance, is less liable to suffer from reduction in friction coefficient attributable to accumulation of paper dust and sheet conveying failure attributable to the reduction in friction coefficient, and ensures proper sheet conveyance for a longer period of time. The invention further provides a rubber composition for the sheet conveying roller. The rubber composition comprises an ethylene-propylene-diene rubber and an epoxylated natural rubber as a rubber component. In the rubber composition, the epoxylated natural rubber is present in a proportion of 10 mass % to 90 mass % based on the overall amount of the rubber component including the two rubbers. The sheet conveying roller includes a roller body formed from the rubber composition.

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: The present invention provides a sheet conveying roller which requires a smaller number of ingredients than a prior art sheet conveying roller, has an excellent weather resistance, is less liable to suffer from reduction in friction coefficient attributable to accumulation of paper dust and sheet conveying failure attributable to the reduction in friction coefficient, and ensures proper sheet conveyance for a longer period of time. The invention further provides a rubber composition for the sheet conveying roller. The rubber composition comprises an ethylene-propylene-diene rubber and an epoxylated natural rubber as a rubber component. In the rubber composition, the epoxylated natural rubber is present in a proportion of 10 mass % to 90 mass % based on the overall amount of the rubber component including the two rubbers. The sheet conveying roller includes a roller body formed from the rubber composition.

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: A paper-feeding roller including a rubber composition containing short fibers in which the short fibers has an average fiber diameter not less than 10 ?m nor more than 100 ?m and an average fiber length not less than 0.01 mm nor more than 4 mm. At least one part of all of the short fibers is radially oriented at an angle not less than 10 degrees nor more than 90 degrees with respect to a plane which contacts a surface of the paper-feeding roller, with one end of each of the radially oriented short fibers disposed exposably on the surface of the paper-feeding roller.

Abstract: A paper-feeding roller (3) including a core (2) and a rubber roll (1) mounted on a peripheral surface of the core (2). The rubber roll (1) has a three-layer construction composed of an inner layer (11), an intermediate layer (12), and an outer layer (13). The inner layer (11), the intermediate layer (12), and the outer layer (13) are a non-foamed layer respectively. The JIS-A hardness of the inner layer (11) is set to not more than 10 degrees. The JIS-A hardness of the outer layer (13) is set to a range of 25 to 60 degrees.

Abstract: A paper feed roller having an inner layer and an outer layer both consisting of rubber, with a peripheral surface of the inner layer and an inner peripheral surface of the outer layer in close contact without forming a gap therebetween. A rubber component of the inner layer consists of butyl rubber. A rubber component of the outer layer consists of EPDM, silicone rubber or urethane rubber. The JIS-A hardness of the inner layer is set to not more than 10 degrees, and the JIS-A hardness of the outer layer is set to not less than 25 nor more than 60 degrees.

Abstract: A paper-feeding roller (3) including a core (2) and a rubber roll (1) mounted on a peripheral surface of the core (2). The rubber roll (1) has a three-layer construction composed of an inner layer (11), an intermediate layer (12), and an outer layer (13). The inner layer (11), the intermediate layer (12), and the outer layer (13) are a non-foamed layer respectively. The JIS-A hardness of the inner layer (11) is set to not more than 10 degrees. The JIS-A hardness of the outer layer (13) is set to a range of 25 to 60 degrees.

Abstract: A paper-feeding roller including a rubber composition containing short fibers in which the short fibers has an average fiber diameter not less than 10 ?m nor more than 100 ?m and an average fiber length not less than 0.01 mm nor more than 4 mm. At least one part of all of the short fibers is radially oriented at an angle not less than 10 degrees nor more than 90 degrees with respect to a plane which contacts a surface of the paper-feeding roller, with one end of each of the radially oriented short fibers disposed exposably on the surface of the paper-feeding roller.

Abstract: A rubber roller formed by molding an elastomer composition not less than 250 ?s nor more than 400 ?s in a T2 relaxation time (spin-spin relaxation) of a bound rubber formed between a rubber and/or a thermoplastic elastomer and a reinforcing filler. EPDM can be used as the rubber and/or the thermoplastic elastomer, carbon black as the reinforcing filler, and an organic peroxide as a crosslinking agent. The T2 relaxation time (spin-spin relaxation) of the bound rubber formed between the rubber and/or thermoplastic elastomer and the reinforcing filler is more than a T2 relaxation time of a bound rubber of the rubber and/or thermoplastic elastomer to which the reinforcing filler is not added by not less than 150% nor more than 300%.

Abstract: A rubber roller (1) is formed by molding an elastomer composition not less than 250 &mgr;s nor more than 400 &mgr;s in a T2 relaxation time (spin-spin relaxation) of a bound rubber formed between a rubber or/and a thermoplastic elastomer and a reinforcing filler. It is preferable to use EPDM as the rubber or/and the thermoplastic elastomer, carbon black as the reinforcing filler, and crosslink the EPDM with an organic peroxide. It is also preferable that the T2 relaxation time (spin-spin relaxation) of the bound rubber formed between the rubber or/and the thermoplastic elastomer and the reinforcing filler is more than a T2 relaxation time of a bound rubber of the rubber or/and the thermoplastic elastomer to which the reinforcing filler is not added by not less than 150% nor more than 300%.