| 摘要 |
A roller has a spray-coated surface structure that provides the roller with an increased surface friction, so that the roller is suitable for push feeding sheet material. The spray-coated surface structure includes a coarsened layer, a finished layer, and a frictional layer provided on an outer circumferential surface of the roller from inner to outer side. The frictional layer is formed by mixing predetermined amount of liquid polyester with predetermined amount of silicon carbide powder and/or alumina oxide powder at normal temperature and pressure, evenly spraying the mixture over the roller, heating the roller for the mixture to set on the outer surface of the roller, and allowing the roller to cool.
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