The servo screwing technology is mainly applied to places of high requirement for screwing torque, especially applicable to high-speed PET line and aseptic line. Hefei Zhongchen Co. Has completed the R&D and production of servo screwing machine by cooperation with famous Germany companies. The differential screwing technology is specially designed to make 30/25 water cap, 28 cap, 38 cap and 28 cap, etc. Use the same set of screwing system, which has greatly reduced the time of capper changeover, and significantly improved customers' work efficiency.