... for manufacture of automobile, household electric appliance, building construction and base plate for color coating etc. 2.Technical ... zinc potskin pass: four-tandem, bottom support roller AC frequency drivingtension leveler: single bending & single stretching /double bending ... among 0.5~2.0%driving control: main drive adopt SIEMENS AC complexor frequency control systemquality standard: GI:GB/T2518- ...