| 摘要 |
A paper-feeding roller, made of a cylindrical elastic material, which is used for a printing apparatus of ink jet type, with the paper-feeding roller mounted on a core, wherein a friction coefficient (mu) of the paper-feeding roller is set not less than 1.5; and the following relationship is established among the friction coefficient (mu) of the paper-feeding roller, a tensile elongation E (%) thereof, and a fracture-time strength T (MPa) thereof:<paragraph lvl="0"><in-line-formula>15>(ExT)/(mux100)>=5</in-line-formula>
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