Tin thickness closed-loop control for tinning line, a kind of typical non-linear complex system with large time delay, is discussed.

The proper tension control method, precise and distribution are greatly needed for 1420 Electrolyte Tinning Line (ETL) of Baosteel when extreme-dimensioned production is being produced.

Normal production of the electrolytic tinning line at Baoshan Iron & Steel Co. Ltd. was restrained to some extent by short service life of the reflow conduct roll and frequent rush repairs.