Optical grade b0pet casting roll and battery diaphragm casting roll

　　Technical requirements:

　　● Coaxiality and cylindricity (jump measurement) s0.01mm

　　● Provide thermal imaging report when the surface temperature difference is within ± 0.5

　　● straightness ≤ 0.01mm

　　● Dynamic balance g2.5

　　● Thickness of chromium plating layer ≥ 120um

　　● Tightness test: air pressure test 6kg, pressure holding for 3 hours, no leakage

　　● Hardness of chromium plating layer HRC ≥ 62

　　● The internal flow passage adopts cross convection structure

　　● Shaft head conditioning hrc27-30

　　● Surface roughness Ra ≤ 0.005um