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Mirror Roller: materials: high-quality 45 # steel pipe, alloy steel pipe, precision steel pipe. Structure: Liner Spiral Runner and jacketed structure design and processing: heat treatment process conditioning treatment, after the car, with other processing, red set of hot assembly welding, stress, quenching, finishing car, fine grinding, hard chromium plating, then ultra-fine grinding, using the United States 3m abrasive precision grinding polishing. Parameter: roughness Ra0.005(finish grade 14 or above) , without any vibration lines, stripes, hair pulling. Straightness, runout and coaxiality ≤0.005 mm. The temperature difference between cooling and heating is ≤ ± 1 ° C, and the thermal deformation is ≤0.01 mm. After quenching roll surface hardness HRC55 ~ 58, plating hard chromium, hardness HRC65. Applications: PVC, ABS, PP, Pt, PE, PC and other plastic sheet, plate, film, paper, leather, metal, cloth, decorative materials such as surface calendering and calendering.