Abstract: This paper introduces in detail the working principle, structure composition, technical characteristics and main innovative design points for a large-scale metal strip surface modification continuous roll to roll coating production line. It analyzes and points out the main factors and solutions that affect the coating quality and production efficiency of the metal strip with large diameter and width. It focuses on the scientific basis of improving the coating speed and film adhesion,and solves the problems of low coating efficiency, poor uniformity, unstable optical properties of spectrum L, a, b value and so on in the current metal strip continuous winding coating production line. The comprehensive application of the independently developed AEG arc ion etching auxiliary system, cylindrical cathode arc ion evaporation technology and medium frequency magnetron sputtering technology help to increase the deposition rate by 1.3~2 times. The color difference fluctuation of L value, a value and b value of the whole roll coating is not more than ± 1.0,± 1.5 and ± 1.8, respectively.

Key words: metal strip, ion etching, cylinder long arc, medium frequency sputtering, RTR continuous line