Influence of knitted deformation on dyeing in flat pad dyeing

In view of the challenge in the pad-dyeing of open width knitted fabric, which leads to unleveled dyeing and crease formation caused by varying tension during the dyeing operation, reactive dyes of various chemical structures were adopted to pad-dye cotton knitted fabric, and the influence of the dye structure on the dyeing performance of the cotton knitted fabric under different tensile deformation conditions after fixation was investigated by means of variance analysis. The results showed that when the pad-dye cotton knitted fabric are subjected to open width pad-dyeing with reactive red of different active groups, and prebaked and fixed by steaming under the transverse or longitudinal tensioning condition, the tension has small influence on the dyeing and the level dyeing of the knitted fabric; and the difference in the dye structures causes different absorption and fixation of the cotton knitted fabric to dyes, thus, different dyes have difference in the pad-dyeing lifting power to the same knitted fabric. When dyeing in light colors, pad-dyeing can save more dye, especially for reactive red WBRH (KN type), the color depth of pad-dyeing is significantly higher than that of dip dyeing. The dyeing performance and levelness were not affected and the washing color fastness were greater than or equal to 4 grades. Copyright No content may be reproduced or abridged without authorization.