The single factor variable method was used to study the influence of dyeing methods and processes on the dyeing effect of madder pigment on Modal fabrics,and the color fastness and strength of dyed fabric were tested.The results showed that the optimal dyeing method for dyeing Modal fabrics with madder pigment was pre-medium dyeing method.The optimal process for mordant dyeing was:temperature 60℃,time 40 min,and mordant dosage 1.5×10-3 mol/L.The optimal dyeing process was:dyeing time 50 min,dyeing temperature 80℃,the amount of madder pigment was 3%(owf),and the amount of sodium chloride was 20 g/L.The color fastness of Modal fabric after dyeing was good,and there was no significant change in breaking strength compared to the non dyed fabric.The color fastness to soap washing and wet friction of fabrics dyed with alum as a mordant was better than that of ferrous sulfate as a mordant.
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