Abstract: This paper carried out a comprehensive study on the production process in salt-free dyeing technology using reactive dyes, and determined the process parameters of salt-free continuous pad dyeing.The optimized condition is as follows: adopting one-dip-rolling method, the liquor retention is 60%, the ventilation reaction time is 180 seconds, and the steam fixing time is 90 seconds. The fabrics prepared under this condition has excellent color fastness, and good dye permeability, which washing color fastness is up to more than 4 grades, the color fastness to dry friction is up to 4 grades, the color fastness to wet friction is up to 3.5 grades, and the wear discoloration is up to 4 grades.

Key words: reactive dyes; salt-free dyeing; liquor retention; color fastness; wear discoloration