Rubber composition for sheet conveying rollers and sheet conveying rollers

Abstract

To provide a sheet conveyance roller having a high coefficient of friction, and a rubber composition for forming its roller body.SOLUTION: A rubber composition for forming a roller body of a sheet conveyance roller contains a rubber component containing an ethylene-α-olefin-based copolymer, and a rosin component.SELECTED DRAWING: None

Claims

1. It contains rubber components, a vulcanizing agent, and rosin and / or rosin derivatives. The aforementioned rubber component contains only ethylene-α-olefin copolymer, A rubber composition for sheet conveying rollers, characterized in that it contains a sulfur-based vulcanizing agent or an organic peroxide as the vulcanizing agent.

2. It contains a rubber component comprising an ethylene-α-olefin copolymer and a diene rubber, a vulcanizing agent, and rosin and / or a rosin derivative. The aforementioned diene rubber contains natural rubber, isoprene rubber, styrene-butadiene rubber, butadiene rubber, or chloroprene rubber, but does not contain acrylonitrile-butadiene rubber. A rubber composition for sheet conveying rollers, characterized in that it contains an organic peroxide as the vulcanizing agent.

3. The rubber composition for sheet conveying rollers according to claim 2, wherein the content of ethylene-α-olefin copolymer in the rubber component is 50% by mass or more.

4. A rubber composition for a sheet conveying roller according to any one of claims 1 to 3, comprising an organic peroxide as a vulcanizing agent, wherein the acid value of the rosin and / or rosin derivative is 50 mg KOH / g or less.

5. It contains a rubber component comprising an ethylene-α-olefin copolymer and a diene rubber, a vulcanizing agent, and rosin and / or a rosin derivative. The content of diene rubber in the aforementioned rubber component is 25% by mass or more and 45% by mass or less. The aforementioned diene rubber contains natural rubber, isoprene rubber, styrene-butadiene rubber, butadiene rubber, or chloroprene rubber. A rubber composition for sheet conveying rollers, characterized in that it contains a sulfur-based vulcanizing agent as the vulcanizing agent.

6. The rubber composition for a sheet conveying roller according to claim 2, 3, or 5, wherein the diene rubber is isoprene rubber and / or natural rubber.

7. The rubber composition for a sheet conveying roller according to any one of claims 1 to 6, wherein the composition contains 1 to 15 parts by mass of rosin and / or a rosin derivative per 100 parts by mass of the rubber component.

8. The rubber composition for a sheet conveying roller according to any one of claims 1 to 7, wherein the sheet is a single sheet of paper.

9. A sheet conveying roller characterized by being obtained by curing a rubber composition for sheet conveying rollers according to any one of claims 1 to 8.

10. A method for producing a rubber composition for a sheet conveying roller according to any one of claims 1 to 8, comprising: a first step of kneading a rubber component containing an ethylene-α-olefin copolymer with rosin and / or a rosin derivative at a temperature above the softening point of the rosin and / or rosin derivative to obtain a kneaded product; and a second step of mixing a vulcanizing agent into the kneaded product.

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