Effect of wet heat setting on dyeing behaviors of supermicro nylon fiber

The polyamide fiber has semicrystalline structures and is very unstable when be woven into yarns and fabrics.The effect of various presetting(including dry heat,steam and hot water setting) on dyeing properties of fine-denier polyamide 6 fibers with reactive dyes is investigated,and the fabric structures are characterized by DSC and XRD.It is found that the color yield of the hot water-setting samples is significantly higher than that of heat and steam settings,and is doubled than unsetting fabric when presetted at 130 ℃ for 45 min,and its crystal form has been transformed from γ-phase into α-phase greatly,with the crystallization enthalpy increase from 63.73 J/g to 88.22 J/g.What′s more,the temperature of hot water-setting has a great effect on the uniformity of dyeing.