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Roller is cylindrical parts, according to use is divided into a drive roller and a driven roller; According to the driving mode is divided into power roller and no power roller, Power roller is divided into Single sprocket roller, double sprocket roller, single O belt roller and double O belt roller; No power roller is divided into the inner tooth axis roll and spring press-in type roller. According to structural style is divided into cylindrical roller and tapered roller. After the roller forming, due to rust corrosion, wear and prop up needs, also need surface treatment or cladding such as spray paint, galvanizing, TEFLON flame plating, rubber coating, chroming, ceramic flame plating, oxygenation and other working procedure.